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Water Resources Data Puerto Rico and the U.S. Virgin Islands Water Year 1990 St Thomas I Isia de \P Culebra Isia de Vieques PUERTO RICO St John I U. S. V I R G I N ISLANDS Saint Croix I U.S. GEOLOGICAL SURVEY WATER-DATA REPORT PR-90-1 Prepared in cooperation with the Commonwealth of Puerto Rico, the Government of the U.S. Virgin Islands, and other agencies CALENDAR FOR WATER YEAR 1990 1234567 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 1989 OCTOBER S M T W T F S NOVEMBER S M T W T F S DECEMBER S M T W T F S 1234 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 1 2 3456789 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 1990 JANUARY S M T W T F S 123456 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 FEBRUARY S M T W T F S 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 MARCH S M T W T F S 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 APRIL S M T W T F S 1234567 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 JULY S M T W T F S 1234567 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MAY 5 M T W T F S 12345 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 AUGUST S M T W T F S 1234 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 JUNE S M T W T F S 1 2 3456789 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 1 2345678 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Water Resources Data Puerto Rico and the U.S. Virgin Islands Water Year 1990 by R.E. Curtis, Jr., Z. Aquino, P.L Diaz, and R.J. Vachier Isia de AP Culebra St Thomas St John I Isia de Vieques PUERTO RICO U. S. V I R G I N ISLANDS Saint Croix I U.S. GEOLOGICAL SURVEY WATER-DATA REPORT PR-90-1 Prepared in cooperation with the Commonwealth of Puerto Rico, the Government of the U.S. Virgin Islands, and other agencies U.S. DEPARTMENT OF THE INTERIOR MANUEL LUJAN, JR., Secretary U.S. GEOLOGICAL SURVEY Dallas L. Peck, Director For additional information on the water resources investigation programs in Puerto Rico and the U.S. Virgin Islands write to: Chief, Caribbean District, Water Resources Division U.S. Geological Survey P.O. Box 364424 San Juan, Puerto Rico 00936-4424 (Telephone: (809) 749-4346) Ill PREFACE This annual hydrologic data report of Puerto Rico and the U.S. Virgin Islands is one of a series of annual reports that document hydrologic data gathered from the U.S. Geological Survey's surface- and ground-water data- collection networks in each state, Puerto Rico, the U.S. Virgin Islands, and the other Trust Territories. These records of streamflow, ground-water levels, and quality of water provide the hydrologic information needed by state, local and Federal agencies, and the private sector for developing and managing our Nation's land and water resources. The report is the culmination of a concerted effort by dedicated personnel of the U.S. Geological Survey, Water Resources Division who collected, compiled, analyzed, verified, and organized the data, and who typed, edited, and assembled the report. In addition to the authors, who had primary responsibility for assuring that the information contained herein is accurate, complete and adheres to Geological Survey policy and established guidelines, the following personnel contributed significantly to the collection, processing and tabulations of the data: Jose M. Agis George Arroyo Angel Class-Cacho Iris M. Concepcion Angel G. Ferrer Carlos Figueroa Eduardo Figueroa Alien Gellis Evelyn S. Guevara Senen Guzman-Rios Felipe Hernandez Sandra Lagares Ernesto Mangual Francisco Perez-Blair Ronald Richards Miguel Rodriguez Ana V. Sanchez Jose Rene Sanchez Luis Santiago-Rivera Luis Soler Heriberto Torres-Sierra Jose A. Torres Michael Torres Ahmed Valencia Ruth I. Guzman typed the text of the report. prepared the illustrations. Francisco Maldonado This report was prepared in cooperation with agencies of the Commonwealth of Puerto Rico, the Government of the U.S. Virgin Islands, and with other federal agencies under the general supervision of Alien L. Zack, District Chief, Caribbean District, San Juan, Puerto Rico. 50272 -101 REPORT DOCUMENTATION PAGE 1. REPORT NO. USGS/WRD/HD-91/258 S. Recipient's Accession No. 4. Title and Subtitle Water Resources Data for Puerto Rico and the U.S. Virgin Islands Water Year 1990 5. Report Date March 1991 7. Authors) RUSSell E. Curtis, Jr., Zaida Aquino, ______Ricardo J. Vachier, Pedro L. Diaz ft. Performing Organization Rept. No. USGS-WDR-PR-90-1 9. Performing Organization Name and Address U.S. Geological Survey, Water Resources Division P.O. Box 364424 San Juan, Puerto Rico 00936-4424 10. Project/Task/Work Unit No. 11. Contract(C) or Grant(G) No. (C) (6) 12. Sponsoring Organization Name and Address U.S. Geological Survey, Water Resources Division P.O. Box 364424 San Juan, Puerto Rico 00936-4424 13. Type of Report & Period Covered Annual-Oct. 1, 1989 to Sept. 30, 1990 14. 15. Supplementary Notes Prepared in cooperation with the Commonwealth of Puerto U.S. Virgin Islands and other agencies. Rico, the Government of the 16. Abstract (Limit: 200 words) Water-resources data for surface-water, quality-of-water, and ground-water records for the 1990 water year for Puerto Rice and the U.S. Virgin Islands, consists of records of discharge, water quality of streams, and water levels of wells. This report contains discharge records for 62 streamflow-gaging stations; 112 partial-record or miscellaneous streamflow stations; stage records for 8 reservoirs; 1 crest-stage, partial record stream- flow stations; water quality records for 16 streamflow-gaging stations, 42 ungaged streamsites, 11 lake sites, 2 lagoons, and 1 bay; and water-level records for 85 observa- tion wells. These data represent that part of the National Water Data System collected by the U.S. Geological Survey and cooperating local and federal agencies in Puerto Rico and the U.S. Virgin Islands. 17. Document Analysis a. Descriptors *Surface water, *Water quality, *Ground water, Aquifers, Chemical analysis, Gaging stations, Hydrologic data, Sediments, Streamflow, Water analysis, Water Levels, Lakes, b. Identifiers/Open-Ended Terms Puerto Rico, U.S. Virgin Islands, Sampling sites. c. COSATI Field/Group 18. Availability Statement NO RESTRICTION ON DISTRIBUTION 19. Security Clan (This Report) Unclassified 20. Security Class (This Page) Unclassified 21. No. of Pages 530 22. Price (See ANSI-Z39.18) See Instructions on Reverse OPTIONAL FORM 272 (4-77) CONTENTS V Page Preface ................................ iii List of surface-water and water-quality stations, in downstream order, for which records are published ............. viii List of ground-water wells, by basin, for which records are published ........................... xiii Introduction .............................. 1 Cooperation ............................... 2 Summary of hydrologic conditions .................... 3 Precipitation .......................... 3 Surface water .......................... 3 Ground water ........................... 4 Water quality .......................... 8 Special networks and programs ...................... 10 Explanation of records ......................... 10 Station identification numbers .................. 19 Downstream order system ................... 19 Latitude-longitude system .................. 19 Records of stage and water discharge ............... 20 Data collection and computation ..................... 20 Data presentation ...................... 22 Identifying estimated daily discharge ............ 25 Accuracy of the records ................... 25 Records of surface-water quality ................. 25 Classification of records ...................... 26 Arrangement of records ................... 26 On-site measurements and sample collection ......... 26 Water temperature ...................... 27 Sediment .......................... 28 Laboratory measurements ................... 28 Data presentation ...................... 28 Remark codes ........................ 30 Records of ground-water levels .................. 30 Data collection and computation ............... 30 Data presentation ...................... 31 Records of ground-water quality ................. 32 Data collection and computation ............... 32 Data presentation ...................... 33 Access to WATSTORE data ......................... 33 Definition of terms ........................... 34 Publications on Techniques of Water-Resources Investigations ...... 48 Surface- and quality-of-water records for Puerto Rico .......... 51 Discharge at partial-record stations in Puerto Rico .......... 395 Water-quality at partial-record stations in Puerto Rico ........ 409 Ground-water records for Puerto Rico ................. 421 Surface-water records for the U.S. Virgin Islands ........... 479 Ground-Water records for the U.S. Virgin Islands ........... 485 Index ................................ 507 VI ILLUSTRATIONS Page Figure 1. Graph showing monthly-mean discharge of selected streams in Puerto Rico ................. 5 2. Graph showing ground-water levels at selected wells in Puerto Rico and the U.S. Virgin Islands ......................... 7 3. Map showing location of fecal coliform bacteria concentration at sampled sites ............. 11 4. Map showing location of fecal streptococci bacteria concentration at sampled sites ......... 12 5. Map showing location of surface-water stations in Puerto Rico ..................... 13 6. Map showing location of water-quality stations in Puerto Rico ..................... 14 7. Map showing location of low-flow partial-record stations in Southwest Puerto Rico ............ 15 8. Map showing location of ground-water stations in Puerto Rico ....................... 16 9. Map showing location of surface-water stations in U.S. Virgin Islands ................... 17 10. Map showing location of ground-water stations in the U.S. Virgin Islands ................. 18 11. Grid showing system for numbering wells and miscellaneous site (latitude and longitude) ....... 20 12. Map showing the Rio Guajataca basin ............ 53 13. Map showing the Rio Camuy basin .............. 61 14. Map showing the Rio Grande de Arecibo basin ........ 67 15. Map showing the Rio Grande de Manati basin ........ 93 16. Map showing the Rio Cibuco basin ............ 115 17. Map showing the Rio de la Plata basin .......... 123 18. Map showing the Rio Hondo to the Rio Puerto Nuevo basins ..................... 141 19. Map showing the Rio Grande de Loiza basin ........ 203 20. Map showing northeastern river basins the Rio Herrera to the Rio Anton Ruiz basins ......... 287 21. Map showing southeastern river basins the Rio Humacao to the Rio Seco basins ............ 307 22. Map showing south coast river basins the Rio Salinas to the Rio Jacaguas basins .......... 323 23. Map showing south coast river basins the Rio Inabon to the Rio Loco basins ............. 341 24. Map showing the Rio Guanajibo basin ........... 361 25. Map showing the Rio Yagiiez and the Rio Grande de Anasco basins ................... 375 26. Map showing the Rio Culebrinas basin .......... 387 TABLES VII Page Table 1. Island-wide monthly precipitation and annual averages for 1990 water year and the 30-year reference period, 1951-80 ..................... 3 2. Highest water level recorded during 1990 water year and previous high water level (in feet below land- surface datum) at selected ground-water wells in Puerto Rico and the U.S. Virgin Islands ......... 6 3. Surface-water quality stations in Puerto Rico with highest concentration of selected constituents during water year 1990 ................. 8 4. Maximum values for suspended-sediment concentrations and loads during the 1990 water-year .......... 9 5. Factors for conversion of chemical constituents in milligrams per liter to milli-equivalents per liter ... 39 VIII SURFACE-WATER AND WATER-QUALITY STATIONS, IN DOWNSTREAM ORDER, FOR WHICH RECORDS ARE PUBLISHED (Letter after station name designates type of data: (d) discharge, (c) chemical, (b) biological, (s) sediment, (p) pesticide, (e) elevation) Page RIO GUAJATACA BASIN Rio Guajataca at Lares (d,c,b)..................................... 54 Canal Principal de Diversiones at Lago Guajataca (c,b)............. 57 Rio Guajataca above mouth near Quebradillas (c,b).................. 59 RIO CAMUY BASIN Rio Camuy near Bayaney (d)......................................... 62 Rio Camuy near Hatillo (d)......................................... 64 RIO GRANDE DE ARECIBO BASIN Rio Grande de Arecibo near Adjuntas (c,b).......................... 68 Rio Grande de Arecibo near Utuado (c,b)............................ 70 Rio Saliente at Coabey near Jayuya (d).......................... 72 Rio Caonillas above Lago Caonillas near Jayuya (c,b)............ 74 Rio Grande de Arecibo below Lago Dos Bocas near Florida (c,b)...... 76 Rio Grande de Arecibo above Arecibo (d)............................ 78 Rio Tanama near Utuado (d,c,b,s)................................ 80 Rio Tanama at Charco Hondo (d).................................. 88 Rio Grande de Arecibo at Central Cambalache (c,b).................. 90 RIO GRANDE DE MANATI BASIN Rio Orocovis near Orocovis (c,b)................................ 94 Rio Grande de Manati near Morovis (d,c,b).......................... 96 Lago El Guineo at Damsite (e)................................... 99 Lago Matrullas at Damsite (e)................................... 100 Rio Bauta near Orocovis (d)..................................... 101 Rio Grande de Manati at Ciales (d)................................. 103 Rio Grande de Manati at Highway 149 at Ciales (c,b)................ 105 Rio Cialitos at Highway 649 at Ciales (c,b)..................... 107 Rio Grande de Manati at Highway 2 near Manati (d,c,b,p)............ 109 LAGUNA TORTUGUERO BASIN Laguna Tortuguero Outlet near Vega Baja (c,b)...................... 113 RIO CIBUCO BASIN Rio Cibuco below Corozal (d,c,b)................................... 116 Rio Cibuco at Vega Baja (d,c,b).................................... 119 RIO DE LA PLATA BASIN Lago Carite at Damsite (e)......................................... 124 Rio de La Plata at Proyecto La Plata (d,c,b)....................... 125 Rio de La Plata at Comerio (d).. .................................. 128 Rio de La Plata near Comerio (c,b)................................. 129 Rio Guadiana near Naranjito (c,b)............................... 131 SURFACE-WATER AND WATER-QUALITY STATIONS, IN DOWNSTREAM ORDER, IX FOR WHICH RECORDS ARE PUBLISHED—Continued Page Lago La Plata at Damsite (e)....................................... 133 Rio de La Plata below La Plata Dam (d)............................. 134 Rio de La Plata at Highway 2 near Toa Alta (d,c,b,s,p)............. 136 RIO HONDO BASIN Rio Hondo at Flood Channel near Catano (c,b)....................... 142 RIO DE BAYAMON BASIN Lago de Cidra at Damsite near Cidra (e)............................ 144 Rio de Bayamon near Aguas Buenas (c, b) .............................. 145 Rio de Bayamon near Bayamon (d).................................... 147 Rio Guaynabo near Bayamon (c,b)................................. 149 Rio de Bayamon at Flood Channel at Bayamon (c,b,p)................. 151 RIO PUERTO NUEVO BASIN Rio Piedras: Rio Piedras at El Senorial (d,s)............................. 153 Rio Piedras near Rio Piedras (c,b,p)............................... 167 Rio Piedras at Rio Piedras (d,s)................................... 169 Rio Piedras at Hato Rey (d,c,b).................................... 185 Quebrada Josefina at Pineiro Avenue (d,s)....................... 190 Laguna San Jose: Laguna San Jose No. 2 at San Juan (c,b)............................ 200 Bahia de San Juan: Bahia de San Juan No. 5 at San Juan (c,b).......................... 201 QUEBRADA BLASINA BASIN Quebrada Biasina near Carolina (c,b)............................... 204 RIO GRANDE DE LOIZA BASIN Rio Grande de Loiza at Quebrada Arenas (d)......................... 206 Quebrada Blanca at El Jagual (d,s).............................. 208 Quebrada Salvatierra near San Lorenzo (d,s)..................... 219 Rio Cayaguas at Cerro Gordo (d)................................. 230 Rio Turabo above Borinquen (d).................................. 232 Rio Turabo at Borinquen (d)..................................... 234 Rio Grande de Loiza at Caguas (d,c,b,s)............................ 235 Rio Caguitas near Aguas Buenas (d).............................. 244 Rio Caguitas at Highway 30 at Caguas (C,b)...................... 246 Rio Bairoa near Caguas (c,b).................................... 248 Rio Gurabo: Rio Valenciano near Juncos (d)............................... 250 Quebrada Mamey near Gurabo (d)............................... 252 Rio Gurabo at Gurabo (d,s)...................................... 254 Rio Gurabo near Gurabo (c,b).................................... 261 Lago Loiza at Damsite (c,b,e)...................................... 263 Rio Grande de Loiza below Damsite (d,s)............................ 265 Rio Grande de Loiza below Trujillo Alto (c,b)...................... 283 Rio Canovanas near Campo Rico (d)............................... 285 SURFACE-WATER AND WATER-QUALITY STATIONS, IN DOWNSTREAM ORDER, FOR WHICH RECORDS ARE PUBLISHED--Continued Page RIO ESPIRITU SANTO BASIN Quebrada Sonadora near El Verde (d)............................. 288 Quebrada Toronja at El Verde (d)................................ 290 Rio Espiritu Santo near Rio Grande (d,c,b)......................... 292 RIO MAMEYES BASIN Rio Mameyes near Sabana (d)........................................ 296 RIO SABANA BASIN Rio Sabana at Sabana (d) ........................................... 298 RIO FAJARDO BASIN Rio Fajardo near Fajardo (d,c,b,p)................................. 300 Rio Fajardo below Fajardo (c,b).................................... 303 RIO BLANCO BASIN Rio Icacos near Naguabo (d)........................................ 305 RIO HUMACAO BASIN Rio Humacao at Las Piedras (d)..................................... 308 Rio Humacao at Highway 3 at Humacao (c,b).......................... 310 RIO GUAYANES BASIN Rio Guayanes at Yabucoa (c,b,p).................................... 312 Rio Guayanes above mouth at Playa de Guayanes (c,b)................ 314 RIO MAUNABO BASIN Rio Maunabo at Maunabo (c,b)....................................... 316 RIO CHICO BASIN Rio Chico at Providencia (c,b)..................................... 318 RIO GRANDE DE PATILLAS BASIN Rio Grande de Patilias near Patilias (d,c,b,s)..................... 320 RIO SALINAS BASIN Rio Lapas near Rabo del Buey (d)................................... 324 Rio Majada at La Plena (d)......................................... 325 RIO COAMO BASIN Rio Coamo near Coamo (c,b)......................................... 326 RIO DESCALABRADO BASIN Rio Descalabrado near Los Llanos (d)............................... 328 RIO JACAGUAS BASIN Rio Toa Vaca above Lago Toa Vaca (d,s).......................... 330 Rio Jacaguas at Juana Diaz (d)..................................... 338 SURFACE-WATER AND WATER-QUALITY STATIONS, IN DOWNSTREAM ORDER, XI FOR WHICH RECORDS ARE PUBLISHED--Continued Page RIO INABON BASIN Rio Inabon at Real Abajo (d)....................................... 342 RIO BUCANA BASIN Rio Bucana: Rio Cerrillos above Lago Cerrillos near Ponce (d).................. 344 Rio Cerrillos near Ponce (c,b)..................................... 345 Rio Bucana at Hwy 14 Bridge near Ponce (d)......................... 347 RIO PORTUGUES BASIN Rio Portugues near Ponce (d,c,b)................................... 349 Rio Portugues at Ponce (c,b,p)..................................... 352 RIO GUAYANILLA BASIN Rio Guayanilla near Guayanilla (d)................................. 354 Rio Guayanilla at Central Rufina (c,b,p) ........................... 356 RIO YAUCO BASIN Lago Luchetti at Damsite (e)....................................... 358 RIO LOCO BASIN Rio Loco at Guanica (c,b,p) ........................................ 359 RIO GUANAJIBO BASIN Rio Guanajibo near San German (c,b) ................................ 362 Rio Rosario near Hormigueros (d,c,b,s) .......................... 364 Rio Guanajibo near Hormigueros (d,c,b,p)........................... 372 RIO YAGUEZ BASIN Rio Yagxiez near Mayagxiez (c,b) ..................................... 376 RIO GRANDE DE ANASCO BASIN Lago Guayo near Castaner (e).................................... 378 Rio Grande de Afiasco near Lares (c,b).............................. 379 Rio Grande de Afiasco near San Sebastian (d,c,b,s) .................. 381 Rio Grande de Afiasco near Afiasco (c,b, p) ........................... 384 RIO CULEBRINAS BASIN Rio Culebrinas near San Sebastian (c,b)............................ 388 Rio Culebrinas at Highway 404 near Moca (d)........................ 390 Rio Culebrinas near Aguada (c,b,p)................................. 392 ST. THOMAS, U.S. VIRGIN ISLANDS Bonne Resolution Gut at Bonne Resolution (d)....................... 480 Turpentine Run at Mariendal (d).................................... 481 ST. JOHN, U.S. VIRGIN ISLANDS Guinea Gut at Bethany (d).......................................... 482 XII SURFACE-WATER AND WATER-QUALITY STATIONS, IN DOWNSTREAM ORDER, FOR WHICH RECORDS ARE PUBLISHED--Continued Page ST. CROIX, U.S. VIRGIN ISLANDS Jolly Hill Gut at Jolly Hill (d)................................... 483 Discharge at partial-record stations and miscellaneous sites.......... 395 Crest-stage partial-record stations................................ 408 Low-flow partial-record stations................................... 396 Analyses of samples collected of water-quality partial-record stations and miscellaneous sites................................ 410 GROUND-WATER WELLS, BY BASIN, FOR WHICH RECORDS ARE PUBLISHED XIII Page RIO GUAJATACA BASIN Well 182422067015100 Local number 165............................ 422 Well 182647066552400 Local number 202............................ 423 RIO GRANDE DE ARECIBO BASIN Well 182737066370900 Local number 204............................ 424 RIO GRANDE DE MANATI BASIN Well 182544066341500 Local number 205............................ 425 Well 182757066325600 Local number 206. ........................... 426 Well 182710066303700 Local number 207............................ 427 Well 182308066260400 Local number 210............................ 428 RIO CIBUCO BASIN Well 182647066201700 Local number 70............................. 429 Well 182615066235300 Local number 211............................ 430 Well 182515066194000 Local number 212............................ 431 Well 182330066185700 Local number 213............................ 432 RIO DE LA PLATA BASIN Well 182746066170800 Local number 214. ........................... 433 Well 182530066135400 Local number 216............................ 434 Well 182655066142400 Local number 217............................ 435 RIO HONDO TO RIO PUERTO NUEVO BASINS Well 182623066111000 Local number 218............................ 436 Well 182441066082600 Local number 219............................ 437 Well 182413066044000 Local number 220............................ 438 Well 182436066031200 Local number 221............................ 439 Well 182511066045401 Local number PN-2........................... 440 Well 182435066052701 Local number PN-5........................... 441 Well 182445066043401 Local number PN-6........................... 442 Well 182437066040501 Local number PN-7........................... 443 Well 182443066041500 Local number PN-8a.......................... 444 Well 182443066041502 Local number PN-8c.......................... 445 Well 182417066042700 Local number PN-10.......................... 446 Well 182349066032600 Local number PN-13.......................... 447 RIO GRANDE DE LOIZA BASIN Well 182515065594100 Local number 222............................ 448 RIO HUMACAO TO RIO SECO BASINS Well 175858066100200 Local number 6.............................. 449 Well 180415065513900 Local number 96............................. 450 RIO SALINAS TO RIO JACAGUAS BASINS Well 175829066232200 Local number 87............................. 451 Well 180002066132200 Local number HW-TW-01....................... 452 Well 180017066132100 Local number HW-TW-02....................... 453 Well 180001066122000 Local number HW-TW-03....................... 454 XIV GROUND-WATER WELLS, BY BASIN, FOR WHICH RECORDS ARE PUBLISHED—Continued Page RIO SALINAS TO RIO JACAGUAS BASINS--continued Well 180001066122002 Local number HW-TW-03C...................... 455 Well 180001066122004 Local number HW-TW-03E...................... 456 Well 180000066125200 Local number HW-TW-04....................... 457 Well 175947066130601 Local number HW-TW-05B...................... 458 Well 180006066123700 Local number HW-TW-07....................... 459 Well 175939066121400 Local number HW-TW-08....................... 460 Well 175950066125200 Local number HW-TW-10....................... 461 Well 180012066125500 Local number HW-TW-11....................... 462 Well 180012066125502 Local number HW-TW-11C...................... 463 Well 175957066123400 Local number HW-TW-13....................... 464 Well 175946066102000 Local number HW-TW-14....................... 465 Well 175955066103000 Local number HW-TW-15....................... 466 Well 180206066135500 Local number RM-05.......................... 467 Well 180104066152300 Local number RM-10.......................... 469 Well 180153066302800 Local number JAC-1.......................... 471 Well 180152066302900 Local number JAC-2.......................... 472 Well 180124066310200 Local number JAC-3.......................... 472 Well 180057066311300 Local number JAC-4.......................... 473 RIO INABON TO RIO LOCO BASINS Well 180133066503300 Local number 132. ........................... 474 RIO GUANAJIBO BASIN Well 180132067033800 Local number 143............................ 475 RIO CULEBRINAS BASIN Well 182018066593200 Local number 83............................. 476 Well 182442067091700 Local number 200............................ 477 ST. CROIX, U.S. VIRGIN ISLANDS Well 174225064471900 Local number 1.............................. 486 Well 174225064472000 Local number 2.............................. 487 Well 174243064475100 Local number 3.............................. 488 Well 174245064475800 Local number 4.............................. 489 Well 174308064484400 Local number 6.............................. 490 Well 174525064460600 Local number 7.............................. 491 Well 174527064460100 Local number 8.............................. 491 Well 174532064460300 Local number 9.............................. 492 Well 174329064454700 Local number 10............................. 492 Well 174303064481100 Local number 11............................. 493 Well 174308064482800 Local number 12............................. 494 Well 174316064480800 Local number 13............................. 495 Well 174247064475701 Local number 14............................. 496 Well 174319064454401 Local number 15............................. 497 XV GROUND-WATER WELLS, BY BASIN, FOR WHICH RECORDS ARE PUBLISHED—Continued Page ST. THOMAS, U.S. VIRGIN ISLANDS Well 182050064580400 Local number 1.............................. 498 Well 182138064543100 Local number 2.............................. 498 Well 182138064542500 Local number 3.............................. 498 Well 182136064541900 Local number 4.............................. 499 Well 182029064535200 Local number 5.............................. 499 Well 182038064550300 Local number 6.............................. 500 ST. JOHN Well Well Well Well Well Well Well Well Well Well U.S. VIRGIN ISLANDS 182010064472600 Local number I 182109064460300 Local number 2 182116064451000 182042064454500 182044064454600 182044064454800 Local number 3. Local number 5. Local number 6. Local number 7. 182044064454900 Local number 8. 182044064455000 Local number 9. 182044064455200 Local number 10 181956064464500 Local number 11 501 501 502 503 504 504 504 505 505 506 XVI THIS PAGE WAS LEFT BLANK INTENTIONALLY 1 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1990 INTRODUCTION The Water Resources Division of the U.S. Geological Survey, in cooperation with local and federal agencies obtains a large amount of data pertaining to the water resources of the Commonwealth of Puerto Rico and the Territory of the U.S. Virgin Islands each water year. These data, accumulated during many water years, constitute a valuable data base for developing an improved understanding of the water resources of the area. To make these data readily available to interested parties outside the Geological Survey, the data are published annually in this report series entitled "Water Resources Data for Puerto Rico and the U.S. Virgin Islands, 1990." This report includes records on both surface and ground water. Specifically, it contains: (1) Discharge records for 62 streamflow-gaging stations, 91 partial-record or miscellaneous streamflow stations, stage records for 8 reservoirs, 1 crest-stage, partial record station, and (2) water-quality records for 16 streamflow-gaging stations, and for 42 ungaged streamsites, 11 lake sites, 2 lagoon, and 1 bay; and (3) water-level records for 76 observation wells. Water-resources data for Puerto Rico for calendar years 1958-67 were released in a series of reports entitled "Water Records of Puerto Rico". Water-resources data for the U.S. Virgin Islands for the calendar years 1962-69 were released in a report entitled "Water Records of U.S. Virgin Islands." Included were records of streamflow, ground-water levels, and water-quality data for both surface and ground water. Beginning with the 1968 calendar year, surface-water records for Puerto Rico were released separately on an annual basis. Ground-water level records and water-quality data for surface and ground water were released in companion reports covering periods of several years. Data for the 1973-74 reports were published under separate covers. Water-resources data reports for 1975-76, 1977, 1978, 1979-80, 1981-82, 1983, 1984, 1985, 1986, 1987, 1988, and 1989 water years consist of one volume each and contain data for streamflow, water quality and ground water. Publications similar to this report are published annually by the Geological Survey for all States. These official Survey reports have an identification number consisting of the two-letter State abbreviation, the last two digits of the water year, and the volume number. For example, this volume is identified as "U.S. Geological Survey Water-Data Report PR-90-1". These water-data reports are for sale in paper copy or in microfiche by the National Technical Information Service, U.S. Department of Commerce, Springfield, Virginia, 22161. Additional information, including current prices, for ordering specific reports may be obtained from the District Chief at the address given on back of title page or by telephone (809) 749-4346. WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1990 COOPERATION The U.S. Geological Survey has had cooperative agreements with organizations of the Commonwealth of Puerto Rico and the Territory of the U.S. Virgin Islands for the systematic collections of water resources data since 1958. Organizations that supplied data are acknowledged in the station descriptions. Organizations that assisted in collecting data through cooperative agreements with the Survey are: Puerto Rico Environmental Quality Board Puerto Rico Aqueduct and Sewer Authority Puerto Rico Department of Agriculture Puerto Rico Industrial Development Company Puerto Rico Department of Housing Puerto Rico Highway Authority Puerto Rico Department of Natural Resources Puerto Rico Department of Health Puerto Rico Electric and Power Authority Puerto Rico Planning Board Water Resources Research Institute, University of Puerto Rico Water Resources Research Institute, College of the Virgin Islands U.S. Virgin Islands Water and Power Authority U.S. Virgin Islands Energy Office U.S. Virgin Islands Department of Planning and Natural Resources Funds were also provided by the Corps of Engineers, U.S. Army, for the collection of records at five gaging stations published in this report. Ground-water quality data at selected sites was collected with support from the U.S. Environmental Protection Agency. 3 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1990 SUMMARY OP HYDROLOGIC CONDITIONS Precipitation Precipitation in Puerto Rico during the 1990 water year (October 1989 to September 1990) was lower than normal. Islandwide the precipitation averaged about 79 percent of normal, but was 76 percent of normal in the northern part of the island, 72 percent of normal in the southern part, 89 percent of normal in the eastern part, and 83 percent of normal in the western part. Unusually dry conditions prevailed during October, November, December, and May. Monthly average precipitation island-wide for the 1990 water year and for the 30-year reference period 1951-1980 used to define normal rainfall, as reported by the National Oceanic and Atmospheric Administration, are listed in table 1. \ Table 1. Island-wide monthly precipitation and annual averages for 1990 water year and the 30-year reference period, 1951-80. Month Oct. Nov. Dec. Jan. Feb. Mar. Apr. May June July Aug. Sept. TOTAL Water year 1989 (inches) 5.17 3.35 1.52 3.27 3.23 4.53 3.05 2.55 6.11 5.13 5.20 7.20 50.31 30 -year normal (inches) 7.74 5.95 4.32 3.08 2.35 2.62 4.63 6.48 5.58 5.48 7.28 7.78 63.29 Surface Water Streamflow in Puerto Rico was below normal during the 1990 water year. The 1990 monthly mean streamflow, the long-term monthly median flow- and extreme monthly flows are shown for four index stations in figure 1. During October 1989, streamflow began to decline islandwide. Streamflow was high in September because of the rainfall associated with the passage of Hurricane Hugo over eastern Puerto Rico. Streamflow continued to decline during most of the year. This decline resulted in shortages and water rationing in some municipalities. WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1990 In October, streamflow was above normal in Rio Grande de Manati in the northern part of the island and Rio Grande de Anasco in the western part of the island, which had monthly mean discharges 295 and 146 percent of the long-term median, respectively. For Rio Fajardo in the eastern part of the island and Rio Inabon in the southern part, monthly mean discharges were below normal with 59 and 72 percent of the long-term median, respectively. Islandwide, streamflow declined below the normal range as compared to the long-term median. In Rio Grande de Anasco and Rio Inabon, streamflow records indicated that the 1990 water year was one of the driest on record. Only in October, January, and September were monthly mean discharges above the long-term median. In other months flows ranged from 34 to 92 percent of the long-term median for Rio Grande de Anasco and from 20 to 92 percent of the long-term median for Rio Inabon. The monthly mean discharge for July at the Rio Grande de Anasco station was the lowest ever recorded for that month since records began in 1964. In September, the increase in precipitation caused by the passage of tropical storms produced flows well above the normal range. The Rio Grande de Manati, in the northern part of the island, had flows below normal from November to February and from April to August. During these months, the monthly mean discharges ranged from 49 to 80 percent of the long-term median. During March and September, however, monthly mean flows of 198 and 132 percent of the long-term median, respectively, were recorded. Streams in the eastern part of the island generally had the highest flows during the 1990 water year. Rio Fajardo was the only station that recorded monthly mean flows above the long-term median for three consecutive months, February, March, and April. The monthly mean flows at the station were also above the median during July and August. During the rest of the 1990 water year, however, streamflow was below the long-term median. The monthly mean discharge for December was the lowest ever recorded for that month at the Rio Fajardo index station since it was started in 1962. The Rio Fajardo station also was the only station that recorded flows below the long-term median for September. In the U.S. Virgin Islands (St. Thomas, St. Croix, and St. John), precipitation and streamflow patterns were similar to those in Puerto Rico. Rainfall in the Virgin Islands in the 1990 water year was 69 percent of normal. Ground-Water Levels Ground-water levels generally declined throughout the island during the 1990 water year, in response to below normal rainfall. Slight ground- water level increases were recorded during August and September 1990, when rainfall on the island was near normal. Although water levels declined throughout much of the year, record-high water levels were recorded during the first few months of the water year at several wells in Puerto Rico and the U.S. Virgin Islands (table 2), as a result of excessive rainfall associated with the passage of Hurricane Hugo. „ WEST RIO GRANDE DE ANASCO NEAR SAN SEBASTIAN (50144000) 4000 100 100 10 SOUTH RIO INABON AT REAL ABAJO (50112500) 1965-89 MONTHLY MEDIAM NORTH RIO GRANDE DE MANATl AT HWY 2 (50038100) 1961-89 MONTHLY MEDIAN 10 EAST RIO FAJARDO NEAR FAJARDO (50071000) 1962-89 MONTHLY MEDIAN 1989 1990 i->ozcDa:a:>- O 2 a-> L-2<2 1989 1990 Unshaded area indicates range between highest and lowest monthly mean discharges for the period of record Figure 1. — —Monthly mean discharge of selected streams in Puerto Rico. WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1990 Ground-water levels in the north coast limestone aquifers of Puerto Rico generally declined during the 1990 water year. Slight increases were recorded during March and August 1990 at the Sabana Hoyos index station when seasonal rainfall occurred in the area (fig. 2). Ground-water levels in the south coast alluvial aquifers declined significantly during the 1990 water year. Below normal rainfall and increased withdrawals caused water levels to decline from October 1989 to July 1990. At the Alomar index well, the water level declined 6.85 feet during that period (fig. 2). During September, this trend was reversed when normal rainfall occurred in the area. Ground-water levels in the U.S. Virgin Islands responded to the same climatological patterns that affected Puerto Rico. The water level at observation well 11 at Guinea Gut, on St. John declined 16.35 feet from October 1989 to August 1990 in response to scarce rainfall in the area (fig. 2) . Table 2. Highest water level recorded during 1990 water year and previous high water level (in feet below land-surface datum) at selected ground-water wells in Puerto Rico and the U.S. Virgin Islands [PR, Puerto Rico; St.C, St. Croix; St.T, St. Thomas; St.J, St. John] Well name Saltos # 1 Ft . Buchanan No. 1 Salud Mental No. 1 RM # 10 JAC-TW1 JAC-TW2 JAC-TW5 JAC-TW6 Fairplains 2 Grade School DPW-2 DPW-1 Guinea Gut 1990 Local high number Location water 165 PR 219 PR PN-5 PR RM # 10 PR JAC-1 PR JAC-2 PR JAC-3 PR JAC-4 PR 2 St.C 6 St.T 9 St.J 10 St.J 11 St.J 38, 34, 26, 25 17 18 24 18 19 1 14 13 2 .86 .97 .20 .47 .41 .14 .28 .15 .45 .53 .93 .54 .71 Date 09-30-90 11-12-89 11-13-89 11-14-89 11-21-89 11-22-89 10-26-89 10-27-89 10-25-89 10-25-89 10-25-89 10-25-89 10-26-89 11-04-89 10-01-89 12-19-89 12-19-89 01-03-90 Previous high water Date 40 35 26 27 17 18 27 18 20 1 17 16 3 .18 .58 .23 .73 .48 .97 .15 .61 .27 .56 .10 .60 .05 09-18-89 09-27-89 09-28-89 09-29-89 09-30-89 09-30-89 10-29-88 07-26-89 09-21-89 10-02-88 10-03-88 09-30-89 09-30-89 07-02-86 07-02-86 06-13-86 Period of record 1-82 12-89 4-89 3-89 10-88 3-89 3-89 10-88 6-83 3-82 9-82 9-82 3-82 to 9-90 to 9-90 to 9-90 to 9-90 to 1-90 to 10-89 to 10-89 to 1-90 to 9-90 to 9-90 to 9-90 to 9-90 to 9-90 WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM to ro "l IO 3 QL R IM CD (/) CD Q a 3 CD Cp_ (7f 5" "D CD O O O O 00 O ID < O m O > •z. m 03 O COm ~o <22> Oo 00 O ID < O m o m CD c: o CO CO Oo So ID < O m o m CD c.z c: o CO m NJ (J1 O m r— r— p CO CD I O CO WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1990 Water Quality In the 1990 water year, the U.S. Geological Survey, in cooperation with local government agencies, completed the sixth year of sampling for the chemical constituents listed in table 3. These constituents were added to the water quality monitoring program in 1985, and are in addition to the major chemical constituents and physical properties monitored in the continuing water-quality monitoring program in Puerto Rico. The highest concentration of each selected constituent detected during the 1990 water year and the station at which the concentration was detected are summarized in table 3. Table 3. Surface-water quality stations in Puerto Rico and the highest concentration of selected constituents during the 1990 water year. [All constituent concentrations are in milligrams per liter; MBAS, Methylene blue active substance] Station number Station name Constituent Concentrat ion 50047600 Rio Bayamon near Sulfide Aguas Buenas 50047530 Rio Hondo at Flood Channel Boron near Catano 1.4 1.0 50050300 Quebrada Blasina near Carolina Manganese 0.52 50149100 Rio Culebrinas near Aguada 5014910 Rio Culebrina near Aguada 50043000 Rio de la Plata at Proyecto la Plata 50055250 Rio Caguitas at Hwy 30 at Caguas 50055250 Rio Caguitas at Hwy 30 at Caguas Iron Zinc Cyanide Phenols MBAS 86 0.13 1.0 0.026 1.3 High concentrations of fecal coliform (FC) and fecal streptococci (FS) bacteria continued to be the principal surface water quality problems in Puerto Rico during the 1990 water year. Bacteria concentrations exceeding one million colonies per hundred milliliters of raw water were found at two stations during the year, Rio Piedras near Rio Piedras (station number 50048800), and Rio Piedras at Hato Rey (station number 50049100). WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1990 Both stations are located in the San Juan metropolitan area where the population density is the highest in Puerto Rico. These streams receive effluent from the upper basin sewage treatment plants upstream of the sampling stations. The highest concentration of PC and FS bacteria in surface waters throughout the island occurred in the heavily populated and industrialized areas. Elevated concentration of suspended sediment are a common problem in many streams in Puerto Rico, especially in the northern coastal areas. Suspended sediment concentrations are of concern because the deposition of these sediments is rapidly reducing the storage capacities of reservoirs used for water supply. Suspended sediment concentration were monitored at eleven sites in Puerto Rico during the 1990 water year as part of the cooperative program between the U.S. Geological Survey and various other Commonwealth and Federal agencies. The sediment stations operated and the maximum suspended -sediments concentrations and loads at each stations are in table 4. Table 4. Maximum values for suspended-sediment concentrations and loads during the 1990 water-year. Station name Station number Maximum suspended- sediment concentration (milligrams per liter) Maximum suspended- sediment load (tons per day) Rio Tanamd Utuado Rio Piedras El Senorial Rio Piedras Rio Piedras near at at 50028000 50048770 50049000 2, 7, 3, 310 110 600 11, 24, 15, 400 900 100 Quebrada Josefina at Pinero Avenue 50049310 Quebrada Blanca at El Jagual 50051150 Quebrada Salva- tierra near San Lorenzo 50051180 Rio Grande de Lolza at Caguas Rio Gurabo at Gurabo Rio Grande de Loiza below Damsite Rio Toa Vaca above Lago Toa Vaca Rio Rosario near Hormigueros 50055000 50057000 50059050 50110900 50136400 397 355 260 691 567 210 1,080 1,440 1,390 103 91 2,830 2,050 534 1,960 3,920 10 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1990 The highest concentrations of fecal coliform and fecal streptococcus bacteria in surface waters occured in heavily populated and industrialized areas of the island. Four sediment stations were operated during the water year. These stations are Rio Tanama near Utuado (50028000), Rio Grande de Loiza at Caguas (50055000), Rio Gurabo at Gurabo (50057000), and Rio Rosario near Hormigueros (50136400). Maximum sediment concentrations were 1,680 milligrams per liter (mg/L) at the Rio Tanama site, 1,950 mg/L at the Rio Grande de Loiza site, 1,350 mg/L at the Rio Gurabo site, and 1,040 mg/L at the Rio Rosario site. Maximum sediment loads at these sites were 2,890 tons per day (ton/d) , at the Rio Tanama site, 51,600 ton/d at the Rio Grande de Loiza site, 61,700 ton/d at the Rio Gurabo site, and 5,350 ton/d at the Rio Rosario site. SPECIAL NETWORKS AND PROGRAMS National Stream Quality Accounting Network (NASQAN) is a nationwide data-collection network designed by the U.S. Geological Survey to meet many of the information needs of government agencies and other groups involved in natural or regional water-quality planning and management. The 500 or so sites on NASQAN are generally located at the downstream ends of hydrologic accounting units designated by the U.S. Geological Survey Office of Water Data Coordination in consultation with the Water Resources Council. The objectives of NASQAN are (1) to obtain information on the quality and quantity of water moving within and from the United States through a systematic and uniform process of data collection, summarization, analysis, and reporting such that the data may be used for, (2) description of the areal variability of water quality in the Nation's rivers through analysis of data from this and other programs, (3) detection of changes or trends with time in the pattern of occurrence of water-quality characteristics, and (4) providing a nationally consistent data base useful for water-quality assessment and hydrologic research. EXPLANATION OF RECORDS The surface-water and ground-water records published in this report are for the 1990 water year that began October 1, 1989 and ended September 30, 1990. A calendar of the water year is provided on the inside of the front cover. The records contain streamflow data, water-quality data for surface and ground water, and ground-water-level data. The locations of the stations and wells where the data were collected are shown in figures 3 to 10. The following sections of the introductory text are presented to provide users with a more detailed explanation of how the hydrologic data published in this report were collected, analyzed, computed, and arranged for presentation. ens' 45' 18°30' AT I A MT 1C O C E A Fe/erdo CARIBBEAN SEA FECAL COLIFORMS <1000 1000-10,000 10,000-100,000 100,000-1,000,000 > 1,000,000 Figure 3.--Location of fecal coliform bacteria concentration at sampled sites. 67s 15' 45' 15' 45' JLAMJIG OCEAN *0 20 3Q KftOMETEFSS CARIBBEAN SEA FECAL STREPTOCOCCI < 1000 1000-10,000 10,000-100,000 100,000-1,000,000 > 1,000,000 20 MILES Figure 4.--Location of fecal streptococci bacteria concentration at sampled sites. 67°00' 18" 30'! ATLANTIC O C E A >tt * -OW .|9 !> 5° .«S K r6" -S<' „ «• " „,. fV »'> d>"*, >«" o- "^ * . »* V =—Oh^cs ;.<uis;>'' \ fi/o 0«s«ao ai Pates , B/o Santiago \ R(a Slaneo /1 Ui 0920 CONTNUOUS STREAMFLOW STATION AND NUMBER CARIBBEAN SEA 1415 LAKE-ELEVATION STATION Figure 5.--Location of surface-water stations in Puerto Rico. CO 18° 30'- ATLANTIC OCEAN 0430 BIOLOGCAL 0820 CHEMICAL 0710 SEGMENT (DALY) 0910 SEGMENT (Bt-MONTHLY) A RIB 8 E A N SEA Figure 6.--Location of water-quality stations in Puerto Rico. 67 15' 18 30' 67 00' 45' 30' 15" 66 00' EXPLANATION A Low-Flow Partial-Record Gaging Station 1107 Station Identification Numbers 15' 18 00' ere Anatseo IJ46< ff/o raga'ez A~A1389 112750 «, 11.09 10 20 s 30 KILOMETERS 1 10 20 MILES CARIBBEAN SEA Figure 7.--Location of low-flow partial-record stations in southwest Puerto Rico. en O) 87°00' 30' 18° 30'- ~, ATLANTIC O C E A N '^-'>:T<;><, , V£o a.*"01 _*c» a»< 11' Fajardo 16'- HW-TW-01 HW-TW-02 HVy-TW-03C HW-TW-05B HVy~TW,-Q3E' HW-TW-11 EXPLANATIONI I6 WELL AND WELL NUMBER 30 KILOMETERS •nJmx " ™j 20 MILES CARIBBEAN SEA Figure 8.--Location of ground-water stations in Puerto Rico. 17 658C5* H3°24S - ST. THOMAS 55' 64W 18°2CT 18°22' 17°45* 17°40' 01234 64°50* 40* ST. 01234 111 II 01234 Figure 9.—Location of surface-water stations in the U.S. Virgin Islands 18 18°24* 18°20* ST. THOMAS 65* 01234 •ess 45s 18°22* 18°18* ST. JOHN 17°45! 17°40* ST. CROCX Frei 45* 40* 01234 LJI I I. I I ! ! I 01234 64°35J Figure 10.—Location of ground-water stations in the U.S. Virgin Islands 19 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1990 Station Identification Numbers Each data station, whether streamsite or well, in this report is assigned a unique identification number. This number is unique in that it applies specifically to a given station and to no other. The number usually is assigned when a station is first established and is retained for that station indefinitely. The systems used by the U.S. Geological Survey to assign identification numbers for surface-water stations and for ground- water well sites differ, but both are based on geographic location. The "downstream order" system is used for regular surface-water stations and the "latitude-longitude" system is used for wells. Downstream Order System Since October 1, 1950, the order of listing hydrologic-station records in Survey reports is in a downstream direction along the main stream. All stations on a tributary entering upstream from a main-stream station are listed before that station. A station on a tributary that enters between two main-stream stations is listed between them. A similar order is followed in listing stations in first rank, second rank, and other ranks of tributaries. As an added means of identification, each hydrologic station and partial-record station has been assigned a station number. These are in the same downstream order used in this report. In assigning station numbers, no distinction is made between partial-record stations and other stations; therefore, the station number for a partial-record station indicates down- stream order position in a list made up of both types of stations that may be established; hence, the numbers are not consecutive. The complete 8-digit number for each station such as 50028000, which appears just to the left of the station name, includes the 2-digit part number "50" plus the 6-digit downstream order number "028000." Latitude-Longitude System The 8-digit downstream order station numbers are not assigned to wells and miscellaneous sites where only random water-quality samples or discharge measurements are taken. The well and miscellaneous site numbering system of the U.S. Geological Survey is based on the grid system of latitude and longitude. The system provides the geographic location of the well or miscellaneous site and a unique number for each site. The number consists of 15 digits. The first 6 digits denote the degrees, minutes, and seconds of latitude, the next 7 digits denote degrees, minutes, and seconds of longitude, and the last 2 digits (assigned sequentially) identify the wells or other sites within a 1-second grid. The numbers shown in the grid correspond to the local numbers assigned to each well as visited in the field. An example is well 16 (fig.11). 20 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1990 66°53' 52' 51' 49' 48' 66°47' 1 R ° O ° 01 — i oO no' I7°59' — 134 132^* 131* \ Vr'6 X •27 •74 C</ c — c COORDINATES FOR WELLS 27 (180150066474900) AND 74 (180135066471000) COORDINATES FOR WELLS 132 (180133066503300) AND 134 (180120066503200) COORDINATES FOR WELL 131 (180058066502700) COORDINATES FOR WELL 16 (175922066495800) Figure 11.--Grid showing system for numbering wells and miscellaneous sites (latitude and longitude). Records of Stage and Water Discharge Records of stage and water discharge may be complete or partial. Complete records of discharge are those obtained using a continuous stage- recording device through which either instantaneous or mean daily discharges may be computed for any time, or any period of time, during the period of record. Complete records of lake or reservoir content, similarly, are those for which stage or content may be computed or estimated with reasonable accuracy for any time, or period of time. They may be obtained using a continuous stage-recording device, but need not be. Because daily mean discharges and end-of-day contents commonly are published for such stations, they are referred to as "daily stations." By contrast, partial records are obtained through discrete measurements without using a continuous stage-recording device and pertain only to a few flow characteristics, or perhaps only one. The nature of the partial record is indicated by table titles such as "Crest-stage partial records," or "Low-flow partial records." Records of miscellaneous discharge measurements or of measurements from special studies, such as low-flow seepage studies, may be considered as partial records, but they are presented separately in this type of report. Location of all complete- record and crest-stage partial-record stations for which data are given in this report are shown in figures 5 and 8. Data Collection and Computation The data obtained at a complete-record gaging station on a stream or canal consists of a continuous record of stage, individual measurements of discharge throughout a range of stages, and notations regarding factors that may affect the relationships between stage and discharge. These data, together with supplemental information, such as weather records, are used to compute daily discharges. The data obtained at a complete-record gaging station on a lake or reservoir consist of a record of stage and of notations regarding factors that may affect the relationship between stage and lake content. These data are used with stage-area and stage-capacity curves or tables to compute water-surface areas and lake storage. 21 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1990 Continuous records of stage are obtained with analog recorders that trace continuous graphs of stage or with digital recorders that punch stage values on paper tapes at selected time intervals or electronic satellite data collector platforms that receive stage values at selected time intervals. Measurements of discharge are made with current meters using methods adapted by the Geological Survey as a result of experience accumulated since 1880. These methods are described in standard textbooks, in Water-Supply Paper 2175, and in U.S. Geological Survey Techniques of Water-Resources Investigations, Book 3, Chapter A6. In computing discharge records, results of individual measurements are plotted against the corresponding stages, and stage-discharge relation curves are then constructed. From these curves, rating tables indicating the approximate discharge for any stage within the range of the measurements are prepared. If it is necessary to define extremes of discharge outside the range of the current-meter measurements, the curves are extended using: (1) logarithmic plotting; (2) velocity-area studies; (3) results of indirect measurements of peak discharge, such as slope-area or contracted-opening measurements, and computations of flow-over-dams or weirs; or (4) step- backwater techniques. Daily mean discharges are computed by applying the daily mean stages (gage heights) to the stage-discharge curves or tables. If the stage- discharge relation is subject to change because of frequent or continual change in the physical features that form the control, the daily mean discharge is determined by the shifting-control method, in which correction factors based on the individual discharge measurements and notes of the personnel making the measurements are applied to the gage heights before the discharges are determined from the curves or tables. This shifting-control method also is used if the stage-discharge relation is changed temporarily because of aquatic growth or debris on the control. At some stream-gaging stations the stage-discharge relation is affected by the backwater from reservoirs, tributary streams, or other sources. This necessitates the use of the slope method in which the slope or fall in a reach of the stream is a factor in computing discharge. The slope or fall is obtained by means of an auxiliary gage set at some distance from the base gage. At some stations the stage-discharge relation is affected by changing stage; at these stations the rate of change in stage is used as a factor in computing discharge. In computing records of lake or reservoir contents, it is necessary to have available from surveys, curves or tables defining the relationship of stage and contents. The application of stage to the stage-content curves or tables gives the contents from which daily, monthly or yearly changes then are determined. If the stage-content relationship changes because of deposition of sediment in a lake or reservoir, periodic surveys may be necessary to redefine it. Even when this is done, as time between the last survey increases, the contents computed may increase in error. Discharges over lake or reservoir spillways are computed from stage-discharge relationships much as other stream discharges are computed. 22 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1990 For some gaging stations there are periods when no gage-height record is obtained, or the recorded gage height is so faulty that it cannot be used to compute daily discharge or contents. This happens when the recorder stops or otherwise fails to operate properly, intakes are plugged, the float is loose in the well, or for various other reasons. For such periods, the daily discharges are estimated from the recorded range in stage, previous or following record, discharge measurements, weather records, and comparison with other station records from the same or nearby basins. Likewise, daily contents may be estimated from operator's logs, previous or following record, inflow-outflow studies, and other information. Information explaining how estimated daily-discharge values are identified in station records is included in the next two sections, "Data Presentation" (REMARKS paragraph) and "Identifying Estimated Daily Discharge." Data Presentation The records published for each gaging station consist of two parts, the manuscript or station description and the data table for the current water year. The manuscript provides, under various headings, descriptive information, such as station location; period of record; average discharge; historical extremes; record accuracy; and other remarks pertinent to station operation and regulation. The following information, as appropriate, is provided with each continuous record of discharge or lake content. Comments to follow clarify information presented under the various headings of the station description. LOCATION.--Information on locations is obtained from the most accurate maps available. The location of the gage with respect to the cultural and physical features in the vicinity and with respect to the reference place mentioned in the station name is given. DRAINAGE AREA.--Drainage areas are measured using the most accurate maps available. Drainage areas are updated as better maps become available. PERIOD OF RECORD.--This indicates the period for which there are published records for the station or for an equivalent station. An equivalent station is one that was in operation at a time that the present station was not, and whose location was such that records from it can reasonable be considered equivalent with records from the present station. REVISED RECORDS.--Published records, because of new information, occasionally are found to be incorrect, and revisions are printed in later reports. Listed under this heading are all the reports in which revisions have been published for the station and the water years to which the revisions apply. If a revision did not include daily, monthly, or annual figures of discharge, that fact is noted after the year dates as follows: "(M)" means that only the instantaneous maximum discharge was revised; "(m)" that only the instantaneous minimum was revised; and " (P) " that only peak discharges were revised. If the drainage area has been revised, the report in which the most recently revised figure was first published is given. 23 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1990 GAGE.--The type of gage in current use, the datum of the current gage, and a condensed history of the types, locations, and datums of previous gages are given under this heading. REMARKS.--Al1 periods of estimated daily-discharge record will either be identified by date in this paragraph of the station description for water-discharge stations or flagged in the daily-discharge table. (See next section, "Identifying Estimated Daily Discharge.") If a remarks statement is used to identify estimated record, the paragraph will begin with this information presented as the first entry. The paragraph is also used to present information relative to the accuracy of the records, to special methods of computations, to conditions that affect natural flow at the station and, possibly, to other pertinent items. For reservoir stations, information is given on the dam forming the reservoir, the capacity, outlet works and spillway, and purpose and use of the reservoir. COOPERATION.--Records provided by a cooperating organization or obtained for the Geological Survey by a cooperating organization are identified here. AVERAGE DISCHARGE.--The discharge value given is the arithmetic mean of the water-year mean discharges. It is computed only for stations having at least 5 water years of complete record, and only water years of complete record are included in the computation. It is not computed for stations where diversions, storage, or other water-use practices cause the value to be meaningless. If water developments significantly altering flow at a station are put into use after the station has been in operation for a period of years, a new average is computed as soon as 5 water years of record have accumulated following the development. The median of yearly mean discharges also is given under this heading for stations having 10 or more water years of record, if the median differs from the average given by more than 10 percent. EXTREMES FOR PERIOD OF RECORD.--Extremes may include maximum and minimum stages and maximum and minimum discharges or content. Unless otherwise qualified, the maximum discharge or content is the instantaneous maximum corresponding to the highest stage that occurred. The highest stage may have been obtained from a graphic or digital recorder, a crest-stage gage, or by direct observation of a nonrecording gage. If the maximum stage did not occur on the same day as the maximum discharge or content, it is given separately. Similarly, the minimum is the instantaneous minimum discharge, unless otherwise qualified, and was determined and is reported in the same manner as the maximum. EXTREMES OUTSIDE PERIOD OF RECORD.—Included here is information concerning major floods or unusually low flows that occurred outside the stated period of record. The information may or may not have been obtained by the U.S. Geological Survey. 24 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1990 EXTREMES FOR CURRENT YEAR.--Extremes given here are similar to those for the period of record, except the peak discharge listing may include secondary peaks. For stations meeting certain criteria, all peak discharges and stages occurring during the water year and greater than a selected base discharge are presented under this heading. The peaks greater than the base discharge, excluding the highest one, are referred to as secondary peaks. Peak discharges are not published for canals, ditches, drains, or streams for which the peaks are subject to substantial control by man. The time of occurrence for peaks is expressed in 24-hour local standard time. For example, 12:30 a.m. is 0030, and 1:30 p.m. is 1330. The minimum for the current water year appears below the table of peak data. REVISIONS.--If a critical error in published records is discovered, a revision is included in the first report published following discovery of the error. Although rare, occasionally the records of a discontinued gaging station may need revision. Because, for these stations, there would be no current or, possibly, future station manuscript published to document the revision in a "Revised Records" entry, users of data for these stations who obtained the record from previously published data reports may wish to contact the District office to determine if the published records were ever revised after the station was discontinued. Of course, if the data were obtained by computer retrieval, the data would be current and there would be no need to check because any published revision of data is always accompanied by revision of the corresponding data in computer storage. Manuscript information for lake or reservoir stations differs from that for stream stations in the nature of the "Remarks" and in the inclusion of a skeleton stage-capacity table when daily contents are given. The daily table for stream-gaging stations gives mean discharge for each day and is followed by monthly and yearly summaries. In the monthly summary below the daily table, the line headed "TOTAL" gives the sum of the daily figures. The line headed "MEAN" gives the average flow in cubic feet per second during the month. The lines headed "MAX" and "MIN" give the maximum and minimum daily discharges, respectively, for the month. Discharge for the month also is usually expressed in cubic feet per second per square mile (line headed "CFSM"), or in inches (line headed "IN."), or in acre-feet (line headed "AC-FT"). Figures for cubic feet per second per square mile and runoff in inches are omitted if there is extensive regulations or diversion or if the drainage area includes large noncontributing areas. In the yearly summary below the monthly summary, the figures shown are the appropriate discharges for the calendar and water years. Data collected at partial-record stations follow the information for continuous-record sites. Data for partial-record discharge stations are presented in two tables. The first is a table of annual maximum stage and discharge at crest-stage stations, and the second is a table of discharge measurements at low-flow partial-record stations. 25 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1990 Identifying Estimated Daily Discharge Estimated daily-discharge values published in the water-discharge tables are identified by flagging individual daily values with the letter symbol "e" and printing a table footnote, "e Estimated." Accuracy of the Records The accuracy of streamflow records depends primarily on: (1) The stability of the stage-discharge relation or, if the control is unstable, the frequency of discharge measurements; and (2) the accuracy of measurements of stage, measurements of discharge, and interpretation of records. The accuracy attributed to the records is indicated under "REMARKS." "Excellent" means that about 95 percent of the daily discharges are within 5 percent of the true; "good," within 10 percent; and "fair," within 15 percent. Records that do not meet the criteria mentioned, are rated "poor." Different accuracies may be attributed to different parts of a given record. Daily mean discharges in this report are given to the nearest hundredth of a cubic foot per second for values less than 1 ft3 /s; to the nearest tenth between 1.0 and 10 ft3 /s; to whole numbers between 10 and 1,000 ft 3 /s; and to 3 significant figures for more than 1,000 ft 3 /s. The number of significant figures used is based solely on the magnitude of the discharge value. The same rounding rules apply to discharges listed for partial-record stations and miscellaneous sites. Information used in the preparation of the records in this publication, such as discharge-measurement notes, gage-height records, temperature measurements, and rating tables are on file in the Caribbean District office. Also, most of the daily mean discharges are in computer- readable form and have been analyzed statistically. Information on the availability of the unpublished information or on the results of statistical analyses of the published records may be obtained from the District office. Records of Surface-Water Quality Records of surface-water quality ordinarily are obtained at or near stream-gaging stations because interpretation of records of surface-water quality nearly always requires corresponding discharge data. Records of surface-water quality in this report may involve a variety of types of data and measurement frequencies. 26 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1990 Classification of Records Water-quality data for surface-water sites are grouped into one of three classifications. A continuinq-record station is a site where data are collected on a regularly scheduled basis. Frequency may be once or more times daily, weekly, monthly, or quarterly. A partial-record station is a site where limited water-quality data are collected systematically over a period of years. Frequency of sampling is usually less than quarterly. A miscellaneous sampling site is a location other than a continuing or partial-record station, where random samples are collected to give better areal coverage to define water-quality conditions in the river basin. A careful distinction needs to be made between "continuing records" as used in this report and "continuous recordings," which refers to a continuous graph or a series of discrete values punched at short intervals on a paper tape. Some records of water quality, such as temperature and specific conductance, may be obtained through continuous recordings; however, because of costs, most data are obtained only monthly or less frequently. Locations of stations for which records on the quality of surface water appear in this report are shown in figure 6. Arrangement of Records Water-quality records collected at a surface-water daily record station are published immediately following that record, regardless of the frequency of sample collection. Station number and name are the same for both records. Where a surface-water daily record station is not available or where the water quality differs significantly from that at the nearby surface-water station, the continuing water-quality record is published with its own station number and name in the regular downstream-order sequence. Water-quality data for partial-record stations and for miscellaneous sampling sites appear in separate tables following the table of discharge measurement at miscellaneous sites. On-site Measurements and Sample Collection In obtaining water-quality data, a major concern needs to be assuring that the data obtained represent the in situ quality of the water. To assure this, certain measurements, such as water temperature, pH, and dissolved oxygen, need to be made onsite when the samples are taken. To assure that measurements made in the laboratory also represent the in situ water, carefully prescribed procedures need to be followed in collecting the samples, in treating the samples to prevent changes in quality pending analysis, and in shipping the samples to the laboratory. Procedures for onsite measurements and for collecting, treating, and shipping samples are given in publications on "Techniques of Water-Resources Investigations," Book 1, Chap. D2; Book 3, Chap. C2; Book 5, Chap. Al, A3, and A4. Detailed information on collecting, treating, and shipping samples may be obtained from the Geological Survey District office. 27 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1990 One sample can define adequately the water quality at a given time if the mixture of solutes throughout the stream cross section is homogeneous. However, the concentration of solutes at different locations in the cross section may vary widely with different rates of water discharge, depending on the source of material and the turbulence and mixing of the stream. Some streams must be sampled through several vertical sections to obtain a representative sample needed for an accurate mean concentration and for use in calculating load. All samples obtained for the National Stream Quality Accounting Network (see definitions) are obtained from at least several verticals. Whether samples are obtained from the centroid of flow or from several verticals, depends on flow conditions and other factors which must be evaluated by the collector. Chemical-quality data published in this report are considered to be the most representative values available for the stations listed. The values reported represent water-quality conditions at the time of sampling as much as possible, consistent with available sampling techniques and methods of analysis. In the rare case where an apparent inconsistency exists between a reported pH value and the relative abundance of carbon dioxide species (carbonate and bicarbonate), the inconsistency is the result of a slight uptake of carbon dioxide from the air by the sample between measurement of pH in the field and determination of carbonate and bicarbonate in the laboratory. For chemical-quality stations equipped with digital monitors, the records consist of daily maximum, minimum, and mean values for each constituent measured and are based upon hourly punches beginning at 0100 hours and ending at 2400 hours for the day of record. More detailed records, when available, (hourly values) may be obtained from the U.S.G.S. District office whose address is given on the back of the title page of this report. Water Temperature Water temperatures are measured at most of the water-quality stations. In addition, water temperatures are taken at time of discharge measurements for water-discharge stations. For stations where water temperatures are taken manually once or twice daily, the water temperatures are taken at about the same time each day. Large streams have a small diurnal temperature change; shallow streams may have a daily range of several degrees and may follow closely the changes in air temperature. Some streams may be affected by waste-heat discharges. At stations where recording instruments are used, either mean temperatures or maximum and minimum temperatures for each day are published. Water temperatures measured at the time of water-discharge measurements are on file in the District office. 28 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1990 Sediment Suspended-sediment concentrations are determined from samples collected by using depth-integrating and pumping sediment samplers. Samples usually are obtained at several verticals in the cross section, or a single sample may be obtained at a fixed point and a coefficient applied to determine the mean concentration in the cross sections. During periods of rapidly changing flow or rapidly changing concentration, samples may have been collected more frequently (twice daily or, in some instances, hourly). The published sediment discharges for days of rapidly changing flow or concentration were computed by the subdivided- day method (time-discharge weighted average). Therefore, for those days when the published sediment discharge value differs from the value computed as the product of discharge times mean concentration times 0.0027, the reader can assume that the sediment discharge for that day was computed by the subdivided-day method. For periods when no samples were collected, daily discharges of suspended sediment were estimated on the basis of water discharge, sediment concentrations observed immediately before and after the periods, and suspended-sediment loads for other periods of similar discharge. At other stations, suspended-sediment samples were collected periodically at many verticals in the stream cross section. Although data collected periodically may represent conditions only at the time of observations, such data are useful in establishing seasonal relations between quality and streamflow and in predicting long-term sediment- discharge characteristics of the stream. In addition to the records of suspended-sediment discharge, records of the periodic measurements of the particle-size distribution of the suspended sediment and bed material are included for some stations. Laboratory Measurements Sediment samples, samples for biochemical-oxygen demand (BOD), samples for indicator bacteria, and daily samples for specific conductance are analyzed locally. All other samples are analyzed in the Geological Survey laboratories in Denver, Co. or Ocala, Fla. Methods used in analyzing sediment samples and computing sediment records are given in TWRI, Book 5, Chap. Cl. Methods used by the Geological Survey laboratories are given in TWRI, Book 1, Chap. D2; Book 3, Chap. C2; Book 5, Chap. Al, A3, and A4. Data Presentation For continuing-record stations, information pertinent to the history of station operation is provided in descriptive headings preceding the tabular data. These descriptive headings give details regarding location, drainage area, period of record, type of data available, instrumentation, general remarks, cooperation, and extremes for parameters currently measured daily. Tables of chemical, physical, biological, radiochemical data, and so forth, obtained at a frequency less than daily are presented first, and tables of "daily values" of specific conductance, pH, water temperature, 29 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1990 dissolved oxygen, and suspended sediment then follow in sequence, when these parameters are studied. In the descriptive headings, if the location is identical to that of the discharge gaging station, neither the LOCATION nor the DRAINAGE AREA statements are repeated. The following information, as appropriate, is provided with each continuous-record station. Comments that follow clarify information presented under the various headings of the station description. LOCATION.--See Data Presentation under "Records of Stage and Water Discharge;" same comments apply. DRAINAGE AREA.--See Data Presentation under "Records of Stage and Water Discharge;" same comments apply. PERIOD OF RECORD.--This indicates the periods for which there are published water-quality records for the station. The periods are shown separately for records of parameters measured daily or continuously and those measured less than daily. For those measured daily or continuously, periods of record are given for the parameters individually. INSTRUMENTATION.—Information on instrumentation is given only if a water-quality monitor temperature record, sediment pumping sampler, or other sampling device is in operation at a station. REMARKS.--Remarks provide added information pertinent to the collection, analysis, or computation of the records. COOPERATION.--Records provided by a cooperating organization or obtained for the Geological Survey by a cooperating organization are identified here. EXTREMES.--Maximums and minimums are given only for parameters measured daily or more frequently. None are given for parameters measured weekly or less frequently, because the true maximums or minimums may not have been sampled. Extremes, when given, are provided for both the period of record and for the current water year. REVISIONS.--If errors in published water-quality records are discovered after publication, appropriate updates are made to the Water- Quality File in the U.S. Geological Survey's computerized data system, WATSTORE, and subsequently by monthly transfer of update transactions to the U.S. Environmental Protection Agency's STORET system. Because the usual volume of updates makes it impractical to doctiment individual changes in the State data-report series or elsewhere, potential users of U.S. Geological Survey water-quality data are encouraged to obtain all required data from the appropriate computer file to insure the most recent updates. The surface-water-quality records for partial-record stations and miscellaneous sampling sites are published in separate tables following the table of discharge measurements at miscellaneous sites. No descriptive statements are given for these records. Each station is published with its own station number and name in the regular downstream-order sequence. 30 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1990 Remark Codes The following remark codes may appear with the water-quality data in this report: PRINTED OUTPUT REMARK Estimated value Actual value is known to be greater than the value shown Actual value is known to be less than the value shown Results based on colony count outside the acceptance range (non-ideal colony count) Biological organism count less than 0.5 percent (organism may be observed rather than counted) Biological organism count equal to or greater than 15 percent (dominant) Biological organism estimated as dominant Records of Ground-Water Levels Only ground-water level data from a basic network of observation wells are published herein. This basic network contains observation wells so located that the most significant data are obtained from the fewest wells in the most important aquifers. Data Collection and Computation Measurements of water levels are made in many types of wells under varying conditions, but the methods of measurement are standardized to the extent possible. The equipment and measuring techniques used at each observation well ensure that measurements at each well are of consistent accuracy and reliability. Each well is identified by means of (1) a 15-digit number that is based on latitude and longitude and (2) a local number that is provided for local needs. See figure 10. 31 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1990 Water-level records are obtained from direct measurements with a steel tape or from the graph or punched tape of a water-stage recorder. The water-level measurements in this report are given in feet with reference to land-surface datum (Isd). Land-surface datum is a datum plane that is approximately at land surface at each well. If known, the elevation of the land-surface datum is given in the well description. The height of the measuring point (MP) above or below land-surface datum is given in each well description. Water levels in wells equipped with recording gages are reported for every day and as an instantaneous observation at noon. Water levels are reported to as many significant figures as can be justified by the local conditions. For example, in a measurement of a depth to water of several hundred feet, the error of determining the absolute value of the total depth to water may be a few tenths of a foot, whereas the error in determining the net change of water level between successive measurements may be only a hundredth of a few hundredths of a foot. For lesser depths to water, the accuracy is greater. Accordingly, most measurements reported to a hundredth of a foot, but some are given to a tenth of a foot or a larger unit. Data Presentation Each well record consists of two parts, the station description and the data table of water levels observed during the water year. The description of the well is presented first through use of descriptive headings preceding the tabular data. The comments to follow clarify information presented under the various headings. LOCATION.--This paragraph follows the well-identification number and reports the latitude and longitude (given in degrees, minutes, and seconds); a landline location designation; the hydrologic-unit number; the distance and direction from a geographic point of reference; and the owner's name. AQUIFER.--This entry designates by name (if a name exists) and geologic age the aquifer(s) open to the well. WELL CHARACTERISTICS.--This entry describes the well in terms of depth, diameter, casing depth and/or screened interval, method of construction, use, and additional information such as casing breaks, collapsed screen, and other changes since construction. DATUM.--This entry describes both the measuring point and the land- surface elevation at the well. The measuring point is described physically (such as top of collar, notch in top of casing, plug in pump base and so on), and in relation to land surface (such as 1.3 ft above land-surface datum). The elevation of the land-surface datum is described in feet above mean sea level datum, if available. It is reported with precision depending on the method of determination. 32 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1990 REMARKS.--This entry describes factors that may influence the water level in a well or the measurement of the water level. It should identify wells that also are water-quality observation wells, and may be used to acknowledge the assistance of local (non-survey) observers. PERIOD OF RECORD.--This entry indicates the period for which there are published records for the well. It reports the month and year of the start of publication of water-level records by the U.S. Geological Survey and the words "to current year" if the records are to be continued into the following year. Periods for which water-level records are available, but are not published by the Geological Survey, may be noted. EXTREMES FOR PERIOD OF RECORD.--This entry contains the highest and lowest water levels of the period of published record, with respect to land- surface datum, and the dates of their occurrence. A table of water levels follows the station description for each well. Water levels are reported in feet below land-surface datum and all taped measurements of water level are listed. For wells equipped with recorders, daily values tables are published for the instantaneous water- level observation at noon. The highest and lowest water levels of the water year are shown on a line below the table. Because all values are not published for wells with recorders, the extremes may be values that are not listed in the table. Missing records are indicated by dashes in place of the water level. Records of Ground-Water Quality Records of ground-water quality in this type of report differ from other types of records in that for most sampling sites they consist of only one set of measurements for the water year. The quality of ground water ordinarily changes only slowly; therefore, for most general purposes one annual sampling, or only a few samples taken at infrequent intervals during the year, is sufficient. Frequent measurement of the same constituents is not necessary unless one is concerned with a particular problem, such as monitoring for trends in nitrate concentration. In the special cases where the quality of ground water may change more rapidly, more frequent measurements are made to identify the nature of the changes. Data Collection and Computation The records of ground-water quality in this report were obtained mostly as a part of special studies in specific areas. Consequently, a number of chemical analyses are presented for some counties but none are presented for others. As a result, the records for this year, by themselves, do not provide a balanced view of ground-water quality Statewide. Such a view can be attained only by considering records for this year in context with similar records obtained for these and other counties in earlier years. 33 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1990 Most methods for collecting and analyzing water samples are described in the "U.S. Geological Survey Techniques of Water-Resources Investigations" manuals listed on a following page. The values reported in this type of report represent water-quality conditions at the time of sampling as much as possible, consistent with available sampling techniques and methods of analysis. All samples are obtained by trained personnel. The wells sampled are pumped long enough to assure that the water collected comes directly from the aquifer and has not stood for a long time in the well casing where it would have been exposed to the atmosphere and to the material, possibly metal, comprising the casings. Data Presentation The records of ground-water quality, when available, are published in a section titled QUALITY OF GROUND WATER immediately following the ground- water level records. Data for quality of ground water are listed alphabetically by County, and are identified by well number. The prime identification number for wells sampled is the 15-digit number derived from the latitude-longitude locations. No descriptive statements are given for ground-water-quality records; however, the well number, depth of well, date of sampling, and other pertinent data are given in the table containing the chemical analyses of the ground water. The REMARK codes listed for surface- water-quality records are also applicable to ground-water-quality records. ACCESS TO WATSTORE DATA The National WATer Data STOrage and REtrieval System (WATSTORE) was established for handling water data collected through the activities of the U.S. Geological Survey and to provide for more effective and efficient means of releasing the data to the public. The system is operated and maintained on the central computer facilities of the Survey at its National Center in Reston, Virginia. WATSTORE can provide a variety of useful products ranging from simple data tables to complex statistical analyses. A minimal fee, plus the actual computer cost incurred in producing a desired product, is charged to the requester. Information about the availability of specific types of data, the acquisition of data or products, and user charges can be obtained locally from each of the Water Resources Division's District offices (see address given on the back of the title page). General inquiries about WATSTORE may be directed to: Chief Hydrologist U.S. Geological Survey 437 National Center Reston, Virginia 22092 34 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1990 DEFINITION OF TERMS Terms related to streamflow, water-quality, and other hydrologic data as used in this report, are defined below. See also the table for converting inch- pound units to the International System of units (SI) on the inside of the back cover. Acre-foot (AC-FT, acre-ft) is the quantity of water required to cover 1 acre to a depth of 1 foot and is equal to about 326,000 gallons or 1,233 cubic meters. Adenosine triphosphate (ATP) is an organic, phosphate-rich, compound important in the transfer of energy in organisms. Its central role in living cells makes it an excellent indicator of the presence of living material in water. A measure of ATP therefore provides a sensitive and rapid estimate of biomass. ATP is reported in micrograms per liter of the original water sample. Algae growth potential (AGP) is the maximum algal dry weight biomass that can be produced in a natural water sample under standardized laboratory conditions. The growth potential is the algal biomass present a stationary phase and is expressed as milligrams dry weight of algae produced per liter of sample. Aquifer is a geologic formation, group of formations, or part of a formation that contains sufficient saturated permeable material to yield significant quantities of water to wells and springs. Artesian means confined and is used to describe a well in which the water level stands above the top of the aquifer, tapped by the well. A flowing artesian well is one in which the water level is above the land surface. Bacteria are microscopic unicellular organisms, typically spherical, rodlike, or spiral and threadlike in shape, often clumped into colonies. Some bacteria cause disease, while others perform an essential role in nature in the recycling of materials; for example, by decomposing organic matter into a form available for reuse by plants. Total coliform bacteria are a particular group of bacteria that are used as indicators of possible sewage pollution. They are charac terized as aerobic or facultative anaerobic, gram-negative, nonspore- forming, rod-shaped bacteria which ferment lactose with gas formation within 48 hours at 35°C. In the laboratory these bacteria are defined as all the organisms which produce colonies with a golden- green metallic sheen within 24 hours when incubated at 35°C +_ 1.0°C on M-Endo medium (nutrient medium for bacterial growth). Their concentrations are expressed as number of colonies per 100 mL of sample. 35 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1990 Fecal coliform bacteria are bacteria that are present in the intestines or feces of warm-blooded animals. They are often used as indicators of the sanitary quality of the water. In the laboratory they are defined as all organisms which produce blue colonies within 24 hours when incubated at 44.5°C +. 0.2°C on M-FC medium (nutrient medium for bacterial growth). Their concentrations are expressed as number of colonies per 100 mL of sample. Fecal streptococcal bacteria are bacteria found also in intestines of warm-blooded animals. Their presence in water is considered to verify fecal pollution. They are characterized as Gram-positive, cocci bacteria which are capable of growth in brain- heart infusion broth. In the laboratory they are defined as all the organisms which produce red or pink colonies within 48 hours at 35°C +_ 1.0°C on KF-streptococcus medium (nutrient medium for bacterial growth). Their concentrations are expressed as number of colonies per 100 mL of sample. Bed material is the unconsolidated material of which a streambed, lake, pond, reservoir, or estuary bottom is composed. Biochemical oxygen demand (BOD) is a measure of the quantity of dissolved oxygen, in milligrams per liter, necessary for the decomposition of organic matter by microorganisms, such as bacteria. Biomass is the amount of living matter present at any given time, expressed as the mass per unit area or volume of habitat. Ash mass is the mass or amount of residue present after the residue from the dry mass determination has been ashed in a muffle furnace at a temperature of 500°C for 1 hour. The ash mass values of zooplankton and phytoplankton are expressed in grams per cubic meter (g/m3 ) , and periphton and benthic organisms in grams per square meter (g/m2 ) . Dry mass refers to the mass of residue present after drying in an oven at 105°C for zooplankton and periphyton, until the mass remains unchanged. This mass represents the total organic matter, ash and sediment, in the sample. Dry-mass values are expressed in the same units as ash mass. Organic mass or volatile mass of the living substance is the difference between the dry mass and the ash mass and represents the actual matter. The organic mass is expressed in the same units as for ash and dry mass. Wet mass is the mass of living matter plus contained water. Bottom material: See Bed material. o g WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1990 Cells/volume refers to the number of cells of any organism which is counted by using a microscope and grid or counting cell. Many planktonic organisms are multicelled and are counted according to the number of contained cells per sample, usually milliliters (mL) or liters (L). Chemical oxygen demand (COD) is a measure of the chemically oxidizable material in the water, and furnishes an approximation of the amount of organic and reducing material present. The determined value may correlate with natural water color or with carbonaceous organic pollution from sewage or industrial wastes. Clorophyll refers to the green pigments of plants. Chlorophyll a and b are the two most common green pigments in plants. Color unit is produced by one milligram per liter of platinum in the form of the chloroplatinate ion. Color is expressed in units of the platinum-cobalt scale. Contents is the volume of water in a reservoir or lake. Unless otherwise indicated, volume is computed on the basis of a level pool and does not include bank storage. Control designates a feature downstream from the gage that determines the stage-discharge relation at the gage. This feature may be a natural constriction of the channel, an artificial structure, or a uniform cross section over a long reach of the channel. Control structure as used in this report is a structure on a stream or canal that is used to regulate the flow or stage of the stream or to prevent the intrusion of salt water. Crest-stage station is a special form of partial-record station that records the highest stage of the stream that occurred between periodic visits to the station. A stage-discharge relation for each gage may be developed from discharge measurements made by indirect methods or by current meter. Cubic foot per second (cfs) is the rate of discharge representing a volume of 1 cubic foot passing a given point during 1 second and is equivalent to 7.48 gallons per second or 448.8 gallons per minute or 0.02832 cubic meters per second. Cubic foot per second-day (cfs-day) is the volume of water represented by a flow of 1 cubic foot per second for 24 hours. It is equivalent to 86,400 cubic feet, approximately 1.9835 acre-feet, about 646,000 gallons, or 2,445 cubic meters. Cubic feet per second per square mile (CFSM) is the average number of cubic feet of water flowing per second from each square mile of area drained, assuming that the runoff is distributed uniformly in time and area. 37 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1990 Discharge is the volume of water (or more broadly, volume of fluid plus suspended sediment), that passes a given point within a given period of time. Instantaneous discharge is the discharge at a particular instant of time. Mean discharge (MEAN) is the arithmetic mean of individual daily mean discharges during a specific period. Dissolved refers to that material in a representative water sample which passes through a 0.45 um membrane filter. This is a convenient operational definition used by Federal agencies that collect water data. Determinations of "dissolved" constituents are made on subsamples of the filtrate. Dissolved-solids concentration of water is determined either analytically by the "residue-on-evaporation" method, or mathematically by totaling the concentrations of individual constituents reported in a comprehensive chemical analysis. During the analytical determination of dissolved solids, the bicarbonate (generally a major dissolved component of water) is converted to carbonate. Therefore, in the mathematical calculations of dissolved-solids concentration, the bicarbonate value, in milligrams per liter, is multiplied by 0.492 to reflect the change. Diversity index is a numerical expression of evenness of distribution of aquatic organisms. The formula for diversity index is: d = - Where n i is the number of individuals per taxon, n is the total number of individuals, and s is the total number of taxa in the sample of the community. Diversity index values range from zero, when all the organisms in the sample are the same, to some positive number, when some or all of the organisms in the sample are d-ifferent. Drainage area of a stream at a specified location is that area, measured in a horizontal plane, enclosed by a topographic divide from which direct surface runoff from precipitation normally drains by gravity into the stream above the specified point. Figures of drainage area given herein include all closed basins, or noncontribution areas, within the area unless otherwise noted. Drainage basin is a part of the surface of the earth that is occupied by a drainage system, which consists of a surface stream or a body of impounded surface water together with all tributary surface streams and bodies of impounded surface water. 38 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1990 Gage height (G.H.) is the water-surface elevation referred to some arbitrary gage datum. Gage height is often used interchangeably with the more general term "stage," although gage height is more appropriate when used with a reading on a gage. Gaging station is a particular site on a stream, canal, lake, or reservoir where systematic observations of hydrologic data are obtained. Ground-water station is a well at which observations of ground-water level are made, either continuously by recorder, or periodically by hand. In addition, various chemical or physical parameters may be obtained, usually on a periodic basis. Hardness of water is a physical-chemical characteristic that is commonly recognized by the increased quantity of soap required to produce lather. It is attributable to the presence of alkaline earths (principally calcium and magnesium) and is expressed as equivalent calcium carbonate (CaC03 ) . Hvdrologic Bench-Mark Network is a network in small drainage basins around the country whose purpose is to provide consistent data on the hydrology, including water quality, and related factors in representative undeveloped watersheds nationwide, and to provide analyses on a continuing basis to compare and contrast conditions observed in basins more obviously affected by the activities of man. Hvdrologic unit is a geographic area representing part or all of a surface drainage basin or distinct hydrologic feature as delineated by the Office of Water Data Coordination on the State Hydrologic Unit Maps; each hydrologic unit is identified by an eight-digit number. Land-surface datum (Isd) is a datum plane that is approximately at land surface at each ground-water observation well. Measuring point (MP) is an arbitrary permanent reference point from which the distance to the water surface in a well is measured to obtain the water level. Metamorphic stage refers to the stage of development that an organism exhibits during its transformation from an immature form to an adult form. This developmental process exists for most insects, and the degree of difference from the immature stage to the adult form varies from relatively slight to pronounced, with many intermediates. Examples of metamorphic stages of insects are egg-larva-adult or egg-nymph-adult. Methylene blue active substances (MBAS) are apparent detergents. The determination depends on the formation of a blue color when methylene blue dye reacts with synthetic anionic detergent compounds. Micrograms per gram (ug/g) is a unit expressing the concentration of a chemical element as the mass (micrograms) of the element per unit mass (gram) of material analyzed. WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1990 39 Micrograms per liter (UG/L, ug/L) is a unit expressing the concentration of chemical constituents in solution as mass (micrograms) of solute per unit volume (liter) of water. One thousand micrograms per liter is equivalent to one milligram per liter. Milligrams per liter (MG/L, mg/L) is a unit for expressing the concentration of chemical constituents in solution. Milligrams per liter represent the mass of solute per unit volume (liter) of water. Concentration of suspended sediment also is expressed in mg/L, and is based on the mass of sediment per liter of water-sediment mixture. Conversion of chemical concentrations in Mg/L to milliequivalents per liter can be done by using the factors in table 5. Table 5. Factors for conversion of chemical constituents in milligrams per liter to milliequivalents per liter. Ion Multiply by Ion Multiply by Aluminum (Al+3)*........ 0.11119 Ammonia as NH4+1........ .05544 Barium (Ba+2)........... .01456 Bicarbonate (HC03-1).... .01639 Bromide (Br-1) .......... .01251 Calcium (Ca+2) .......... .04990 Carbonate (C03-2) ....... .03333 Chloride (Cl-1)......... .02821 Chromium (Cr+6)*........ .11539 Cobalt (Co+2)*.......... .03394 Copper (Cu+2)*.......... .03148 Cyanide (CN-1) .......... .03844 Fluoride (F-l) .......... .05264 Hydrogen (H+l) .......... .99209 Hydroxide (OH-1) ........ .05880 Iodide (I-l) ......... 0.00788 Iron (Fe+3).......... .05372 Lead (Pb+2) .......... .00965 Lithium (Li+1) ....... .14411 Magnesium (Mg+2) . . . . . .08226 Manganese (Mn+2)*.... .03640 Nickel (Ni+2) ........ .03406 Nitrate (N03-1) ...... .01613 Nitrite (N02-1) ...... .02174 Phosphate (P04-3).... .03159 Potassium (K+l) ...... .02557 Sodium (NA+1)........ .04350 Strontium (Sr+2) .. . . . .02283 Sulfate (S04-2) ...... .02082 Zinc (Zn+2)*......... .03060 *Constituent reported in micrograms per liter; multiply by factor and divide results by 1,000. National Stream Quality Accounting Network (NASQAN) is a nationwide data-collection network designed by the U.S. Geological Survey to meet many of the information needs of government agencies and other groups involved in natural or regional water-quality planning and management. The 500 or so sites in NASQAN are generally located at the downstream ends of hydrologic accounting units designated by the U.S. Geological Survey office of Water Data Coordination in consultation with the Water Resources Council. The objectives of NASQAN are (1) to obtain information on the quality and quantity of water moving within and from the United States through a systematic and uniform process of data collection, summarization, analysis, and reporting such that the data may be used for, (2) description of the areal variability of water quality in the Nation's rivers through analysis of description of the areal variability of water quality in the Nation's rivers through analysis of data from this and other programs, (3) detection of changes or trends with time in the pattern of occurrence of water-quality characteristics, and (4) providing a nationally consistent data base useful for water-quality assessment and hydrologic research. 40 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1990 National Trends Network (NTN) is a network for sampling atmospheric deposition in the United States. The purpose of the network is to determine the variability, both in location and in time, of the composition of atmospheric deposition, which includes snow, rain, dust particles, aerosols, and gases. The core from which the NTN was built was the already-existing deposition-monitoring network of the National Atmospheric Deposition Program (NADP). Organism is any living entity. Organism count/area refers to the number of organisms collected and enumerated in a sample and adjusted to the number per unit area habitat, usually square meters (m2 ), acres, or hectare. Periphyton, benthic organisms, and macrophytes are expressed in these terms. Organism count/volume refers to the number of organisms collected and enumerated in a sample and adjusted to the number per sample volume, usually milliliters (mL) or liters (L). Numbers of planktonic organisms can be expressed in these terms. Total organism count is the total number of organisms collected and enumerated in any particular sample. Parameter Code is a 5-digit number used in the U.S. Geological Survey computerized data system, WATSTORE, to uniquely identify a specific constituent. The codes used in WATSTORE are the same as those used in the U.S. Environmental Protection Agency data system, STORET. The Environmental Protection Agency assigns and approves all requests for new codes. Partial-record station is a particular site where limited streamflow and/or water-quality data are collected systematically over a period of years for use in hydrologic analyses. Particle-size is the diameter, in millimeters (mm), of a particle determined by either sieve or sedimentation methods. Sedimentation methods (pipet, bottom-withdrawal tube, visual-accumulation tube) determine fall diameter of particles in either distilled water (chemically dispersed) or in native water (the river water at the time and point of sampling). Particle-size classification used in this report agrees with recommendations made by the American Geophysical Union Subcommittee on Sediment Terminology. The classification is as follows: Classification Size (mm) Method of analysis Clay...... 0.00024 - 0.004 Sedimentation Silt...... .004 - .062 Sedimentation Sand...... .062 - 2.0 Sedimentation or sieve Gravel.... 2.0 -64.0 Sieve The particle-size distributions given in this report are not necessarily representative of all particles in transport in the stream. Most of the organic matter is removed and the sample is subjected to mechanical and chemical dispersion before analysis in distilled water. Chemical dispersion is not used for native water analysis. 41 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1990 Percent composition is a unit for expressing the ratio of a particular part of a sample or population to the total sample or population, in terms of types, numbers, mass or volume. Periphyton is the assemblage of microorganisms attached to and living upon submerged solid surfaces. While primarily consisting of algae, they also include bacteria, fungi, protozoa, rotifers, and other small organisms. Pesticides are chemical compounds used to control undesirable organisms. Major categories of pesticides include insecticides, miticides, fungicides, herbicides, and rodenticides. Picocurie (PC, pCi) is one trillionth (1 X 10- 12 ) of the amount of ratioactivity represented by a curie (Ci) . A curie is the amount of radioactivity that yields 3.7 x 10 10 radioactive disintegrations per second. A picocurie yields 2.22 dpm (disintegrations per minute). Plankton is the community of suspended, floating, or weakly swimming organisms that live in the open water of lakes and rivers. Phytoplankton is the plant part of the plankton. They are usually microscopic and their movement is subject to the water currents. Phytoplankton growth is dependent upon solar radiation and nutrient substances. Because they are able to incorporate as well as release materials to the surrounding water, the phytoplankton have a profound effect upon the quality of the water. They are the primary food producers in the aquatic environment, and are commonly known as algae. Blue-green algae are a group of phytoplankton organisms having a blue pigment, in addition to the green pigment called chlorophyll. Blue-green algae often cause nuisance conditions in water. Diatoms are the unicellular or colonial algae having a siliceous shell. Their concentrations are expressed as number of cells per milliliter (cells/mL) of sample. Green algae have chlorophyll pigments similar in color to those of higher green plants. Some forms produce algae mats or floating "moss" in lakes. Their concentrations are expressed as number of cells per milliliter (cells/mL) of sample. Zooplankton is the animal part of the plankton. Zooplankton are capable of extensive movements within the water column and are often large enough to be seen with the unaided eye. Zooplankton are secondary consumers feeding upon bacteria, phytoplankton, and detritus. Because they are the grazers in the aquatic environment, the Zooplankton are a vital part of the aquatic food web. The Zooplankton community is dominated by small crustaceans and rotifers. 42 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1990 Primary productivity is a measure of the rate at which new organic matter is formed and accumulated through photosynthetic and chemosynthetic activity of producer organisms (chiefly, green plants) . The rate of primary production is estimated by measuring the amount of oxygen released (oxygen method) or the amount of carbon assimilated by the plants (carbon method). Milligrams of carbon per area or volume per unit time [mg C/(m2 .time)] for periphyton and macrophytes and [mg C/(m3 .time)] for phytoplankton are units for expressing primary productivity. They define the amount of carbon dioxide consumed as measured by radioactive carbon (carbon 14) . The carbon 14 method is of greater sensitivity than the oxygen light and dark bottle method, and is preferred for use in unenriched waters. Unit time may be either hour or day, depending on the incubation period. Milligrams of oxygen per area or volume per unit time [mgO / (m2 .time)] for periphyton and macrophytes and [mgO /(m3 .time)] for phytoplankton are the units for expressing primary productivity. They define production and respiration rates as estimated from changes in the measured dissolved-oxygen concentration. The oxygen light and dark bottle method is preferred if the rate of primary production is sufficient for accurate measurements to be made within 24 hours. Unit time may be either the hour or day, depending on the incubation period. Polychlorinated biphenyls (PCBs) are industrial chemicals that are mixtures of chlorinated biphenyl compounds having various percentages of chlorine. They are similar in structure to organochlorine insecticides. Radiochemical program is a network of regularly sampled water-quality stations where samples are collected to be analyzed for radioisotypes. The streams that are sampled represent major drainage basins in the conterminous United States. Recoverable from bottom material is the amount of a given constituent that is in solution after a representative sample of bottom material has been digested by a method (usually using an acid or mixture of acids) that results in dissolution of readily soluble substances. Complete dissolution of all bottom material is not achieved by the dig^rtion treatment and thus the determination represents less than the total amount (that is, less than 95 percent) of the constituent in the sample. To achieve comparability of analytical data, equivalent digestion procedures would be required of all laboratories performing such analyses because different digestion procedures are likely to produce different analytical results. Return period is the average time interval between occurrences of a hydrological event of a given or greater magnitude, usually expressed in years. May also be called recurrence interval. Runoff in inches (IN, in) shows the depth to which the drainage area would be covered if all the runoff for a given time period were uniformly distributed on it. 43 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1990 Sediment is solid material that originates mostly from disintegrated rocks and is transported by, suspended in, or deposited from water; it includes chemical and biochemical precipitates and decomposed organic material, such as humus. The quantity, characteristics, and cause of the occurrence of sediment in streams are influenced by environmental factors. Some major factors are degree of slope, length of slope, soil characteristics, land usage, and quantity and intensity of precipitation. Bed load is the sediment that is transported in a stream by rolling, sliding, or skipping along the bed and very close to it. In this report, bed load is considered to consist of particles in transit within 0.25 ft of the streambed. Bed load discharge (tons per day) is the quantity of bed load measured by dry weight that moves past a section as bed load in a given time. Suspended sediment is the sediment that at any given time is maintained in suspension by the upward components of turbulent currents or that exists in suspension as a colloid. Suspended-sediment concentration is the velocity-weighted concentration of suspended sediment in the sampled zone (from the water surface to a point approximately 0.3 ft above the bed) expressed as milligrams of dry sediment per liter of water-sediment mixture (mg/L). Mean concentration is the time-weighted concentration of suspended sediment passing a stream section during a 24-hour day. Suspended-sediment discharge (tons/day) is the rate at which dry mass of sediment passes a section of a stream or is the quantity of sediment, as measured by dry mass or volume, that passes a section in a given time. It is calculated in units of tons per day as follows: concentrations (mg/L) x discharge (ft 3 /s) x 0.0027. Suspended-sediment load is a general term that refers to material in suspension. It is not synonymous with either discharge or concentration. Total sediment discharge (tons/day) is the sum of the suspended- sediment discharge and the bed-load discharge. It is the total quantity of sediment, as measured by dry mass or volume, that passes a section during a given time. Total-sediment load or total load is a term which refers to the total sediment (bed load plus suspended-sediment load) that is in transport. It is not synonymous with total-sediment discharge. 7-day 10-year low flow (7Q10) is the discharge at the 10-year recurrence interval taken from a frequency curve of annual values of the lowest mean discharge for 7 consecutive days (the 7-day low flow). 44 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1990 Sodium-adsorpt ion-rat io (SAR) is the expression of relative activity of sodium ions in exchange reactions within soil and is an index of sodium or alkali hazard to the soil. Waters range in respect to sodium hazard from those which can be used for irrigation on almost all soils to those which are generally unsatisfactory for irrigation. Solute is any substance that is dissolved in water. Specific conductance is a measure of the ability of a water to conduct an electric current. It is expressed in microsiemens per centimeter at 25°C. Specific conductance is related to the type and concentration of ions in solution and can be used for approximating the dissolved-solids content of the water. Commonly, the concentration of dissolved solids (in milligrams per liter) is about 65 percent of the specific conductance (in micromhos). This relation is not constant from stream to stream, and it may vary in the same source with changes in the composition of the water. Stage-discharge relation is the relation between gage height (stage) and volume of water per unit of time, flowing in a channel. Streamflow is the discharge that occurs in a natural channel. Although the term "discharge" can be applied to the flow of a canal, the word "streamflow" uniquely describes the discharge in a surface stream course. The term "streamflow" is more general than "runoff" as streamflow may be applied to discharge whether or not it is affected by diversion or regulation. Substrate is the physical surface upon which an organism lives. Natural substrate refers to any naturally occurring emersed or submersed solid surface, such as a rock or tree, upon which an organism lives. Artificial substrate is a device which is purposely placed in a stream or lake for colonization of organisms. The artificial substrate simplifies the community structure by standardizing the substrate from which each sample is taken. Examples of artificial substrates are basket samplers (made of wire cages filled with clean streamside rocks) and multiplate samplers (made of hardboard) for benthic organism collection, and plexiglass strips for periphyton. Surface area of a lake is that area outlined on the latest U.S.G.S. topographic map as the boundary of the lake and measured by a planimeter in acres. In localities not covered by topographic maps, the areas are computed from the best maps available at the time planimetered. All areas shown are those for the stage when the planimetered map was made. Surficial bed material is that part (0.1 to 0.2 ft) of the bed material that is sampled using U.S. Series Bed-Material Samplers. Suspended (as used in tables of chemical analyses) refers to the amount (concentration) of the total concentration in a water-sediment mixture. It is associated with the material retained on a 0.45-micrometer filter. 45 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1990 Suspended, recoverable is the amount of a given constituent that is in solution after the part of a representative water-suspended sediment sample that is retained on a 0.45 urn membrane filter has been digested by a method (usually using a dilute acid solution) that results in dissolution of only readily soluble substances. Complete dissolution of all the particulate matter is not achieved by the digestion treatment and thus the determination represents something less than the "total" amount (that is, less than 95 percent) of the constituent present in the sample. To achieve comparability of analytical data, equivalent digestion procedures are required of all laboratories performing such analyses because different digestion procedures are likely to produce different analytical results. Determinations of "suspended, recoverable" constituents are made either by analyzing portions of the material collected on the filter or, more commonly, by difference, based on determinations of (1) dissolved and (2) total recoverable concentrations of the constituent. Suspended, total is the total amount of a given constituent in the part of representative water-suspended sediment sample that is retained on a 0.45 um membrane filter. This term is used only when the analytical procedure assures measurement of at least 95 percent of the constituent determined. A knowledge of the expected form of the constituent in the sample, as well as the analytical methodology used, is required to determine when the results should be reported as "suspended, total." Determinations of "suspended, total" constituents are made either by analyzing portions of the material collected on the filter or, more commonly, by difference, based on determinations of (1) dissolved and (2) total concentrations of the constituent. Taxonomy is the division of biology concerned with the classification and naming of organisms. The classification of organisms is based upon a hierarchial scheme beginning with Kingdom and ending with Species at the base. The higher the classification level, the fewer features the organisms have in common. For example, the taxonomy of a particular mayfly, Hexagenia limbata, is the following: Kingdom.....................Animal Phylum......................Arthopoda Class.......................Insecta Order.......................Ephemeroptera Family......................Ephemeridae Genus.......................Hexagenia Species.....................Hexagenia limbata Thermograph is an instrument that continuously records variations of temperature on a chart. The more general term "temperature recorder" is used in the table heading and refers to any instrument that records temperature whether on a chart, a tape, or any other medium. 46 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1990 Time-weighted average is computed by multiplying the number of days in the sampling period by the concentrations of individual constituents for the corresponding period and dividing the sum of the products by the total number of days. A time-weighted average represents the composition of water that would be contained in a vessel or reservoir that had received equal quantities of water from the stream each day for the year. Tons per acre-foot indicates the dry mass of dissolved solids in 1 acre-foot of water. It is computed by multiplying the concentration of the constituent, in milligrams per liter by 0.00136. Tons per day (T/DAY) is the quantity of a substance in solution or suspension that passes a stream section during a 24-hour period. Total is the total amount of a given constituent in a representative water-suspended sediment sample, regardless of the constituent's physical or chemical form. This term is used only when the analytical procedure assures measurement of at least 95 percent of the constituent present in both the dissolved and suspended phases of the sample. A knowledge of the expected form of the constituent in the sample, as well as the analytical methodology used, is required to judge when the results should be reported as "total." (Note that the word "total" does double duty here, indicating both that the sample consists of a water-suspended sediment mixture and that the analytical method determined all of the constituent in the sample.) Total discharge is the total quantity of any individual constituent, as measured by dry mass or volume, that passes through a stream cross- section per unit of time. This term needs to be qualified, such as "total sediment discharge," "total chloride discharge," and so on. Total, recoverable is the amount of a given constituent that is in solution after a representative water-suspended sediment sample has been digested by a method (usually using a dilute acid solution) that results in dissolution of only readily soluble substances. Complete dissolution of all particulate matter is not achieved by the-digestion treatment, and thus the determination represents something less than the "total" amount (that is, less than 95 percent) of the constituent present in the dissolved and suspended phases of the sample. To achieve comparability of analytical data, equivalent digestion procedures are required of all laboratories performing such analyses, because different digestion procedures are likely to produce different analytical results. Tritium Network is a network of stations which has been established to provide baseline information on the occurrence of tritium in the Nation's surface waters. In addition to the surface-water stations in the network, tritium data are also obtained at a number of precipitations stations. The purpose of the precipitation stations is to provide an estimate sufficient for hydrologic studies of the tritium input to the United States. 47 WATER RESOURCES FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1990 Water year in Geological Survey reports dealing with surface water supply is the 12-month period, October 1 through September 30. The water year is designated by the calendar year in which it ends and which includes 9 of the 12 months. Thus, the year ending September 30, 1980, is called the "1980 water year." WDR is used as an abbreviation for "Water-Data Report" in the REVISED RECORDS paragraph to refer to State annual hydrologic-data reports (WRD was used as an abbreviation for "Water-Resources Data" in reports published prior to 1976). Weighted average is used in this report to indicate discharge- weighted average. It is computed by multiplying the discharge for a sampling period by the concentrations of individual constituents for the corresponding period and dividing the sum of the products by the sum of the discharges. A discharge- weighted average approximates the composition of water that would be found in a reservoir containing all the water passing a given location during the water year after thorough mixing in the reservoir. WSP is used as an abbreviation for "Water-Supply Paper" in references to previously published reports. 4 3 PUBLICATION OF TECHNIQUES OF WATER-RESOURCES INVESTIGATIONS The U.S. Geological Survey publishes a series of manuals describing procedures for planning and conducting specialized work in water-resources investigations. The material is grouped under major subject headings called books and is further divided into sections and chapters. For example, Section A of Book 3 (Applications of Hydraulics) pertains to surface water. The chapter, the unit of publication, is limited to a narrow field of subject matter. This format permits flexibility in revision and publication as the need arises. The reports listed below are for sale by the U.S. Geological Survey, Books and Open-File Reports Section, Federal Center, Box 25425, Denver, Colorado 80225 (authorized agent of the Superintendent of Documents, Government Printing Office). Prepayment is required. Remittance should be sent by check or money order payable to the U.S. Geological Survey. Prices are not included because they are subject to change. Current prices can be obtained by writing to the above address. When ordering or inquiring about prices for any of these publications, please give the title, book number, chapter number, and "U.S. Geological Survey Techniques of Water-Resources Investigations." 1-D1. Water temperature--influential factors, field measurement, and data presentation, by H. H. Stevens, Jr., J. F. Ficke, and G. F. Smoot: USGS—TWRI Book 1, Chapter Dl. 1975. 65 pages. 1-D2. Guidelines for collection and field analysis of ground-water samples for selected unstable constituents, by W. W. Wood: USGS—TWRI Book 1, Chapter D2. 1976. 24 pages. 2-D1. Application of surface geophysics to ground-water investigations, by A. A. R. Zohdy, G. P. Eaton, and D. R. Mabey: USGS—TWRI Book 2, Chapter Dl. 1974. 116 pages. 2-D2. Application of seismic-refraction techniquee to hydrologic studies, by F. P. Haeni: USGS—TWRI Book 2, Chapter D2. 1988. 86 pages. 2-E1. Application of borehole geophysics to water-resources investigations, by W. S. Keys and L. M. MacCary: USGS— TWRI Book 2, Chapter El. 1971. 126 pages. 2-F1. Application of drilling, coring, and sampling techniques to test holes and wells, by Eugene Shuter and Warren E. Teasdale: USGS—TWRI Book 2, Chapter Fl. 1989. 97 pages. 3-A1. General field and office procedures for indirect discharge measurements, by M. A. Benson and Tate Dalrymple: USGS—TWRI Book 3, Chapter Al. 1967. 30 pages. 3-A2. Measurement of peak discharge by the slope-area method, by Tate Dalrymple and M. A. Benson: USGS—TWRI Book 3, Chapter A2. 1967. 12 pages. 3-A3. Measurement of peak discharge at culverts by indirect methods, by G. L. Bodhaine: USGS—TWRI Book 3, Chapter A3. 1968. 60 pages. 3-A4. Measurement of peak discharge at width contractions by indirect methods, by H. F. Matthai: USGS--TWRI Book 3, Chapter A4. 1967. 44 pages. 3-A5. Measurement of peak discharge at dams by indirect methods, by Harry Hulsing: USGS—TWRI Book 3, Chapter A5. 1967. 29 pages. 3-A6. General procedure for gaging streams, by R. W. Carter and Jacob Davidian: USGS—TWRI Book 3, Chapter A6. 1968. 13 pages. 3-A7. Stage measurements at gaging stations, by T. J. Buchanan and W. P. Somers: USGS—TWRI Book 3. Chapter A7. 1968. 28 pages. 3-A8. Discharge measurements at gaging stations, by T. J. Buchanan and W. P. Somers: USGS—TWRI Book 3, Chapter A8. 1969. 65 pages. 3-A9. Measurement of time of travel in streams by dye tracing, by F. A. Kilpatrick and J. F. Wilson, Jr.: USGS—TWRI Book 3, Chapter A9. 1989. 27 pages. 3-A10. Discharge ratings at gaging stations, by E. J. Kennedy: USGS—TWRI Book 3, Chapter A10. 1984. 59 pages. 3-A11. Measurement of discharge by moving-boat method, by G. F. Smoot and C. E. Novak: USGS—TWRI Book 3, Chapter All. 1969. 22 pages. 3-A12. Fluorometric procedures for dye tracing, by J. F. Wilson, Jr., E. D. Cobb, and F. A. Kilpatrick: USGS—TWRI Book 3, Chapter A12. 1986. 41 pages. 3-A13. Computation of continuous records of streamflow, by E. J. Kennedy: USGS—TWRI Book 3, Chapter A13. 1983. 53 pages. 3-A14. Use of flumes in measuring discharge, by F. A. Kilpatrick and V. R. Schneider: USGS—TWRI Book 3, Chapter A14. 1983. 46 pages. 3-A15. Computation of water-surface profiles in open channels, by Jacob Davidian: USGS—TWRI Book 3, Chapter A15. 1984. 48 pages. 3-A16. Measurement of discharge using tracers, by F. A. Kilpatrick and E. D. Cobb: USGS—TWRI Book 3, Chapter A16. 1985. 52 pages. 3-A17. Acoustic velocity meter systems, by Antonius Laenen: USGS—TWRI Book 3, Chapter A17. 1985. 38 pages. 3-A18. Determination of stream reaeration coefficients by use of tracers, by F. A. Kilpatrick, R. E. Rathbun, N. Yotsukura, G. W. Parker, and L. L. DeLong: USGS—TWRI Book 3, Chapter A18. 1989. 52 pages. 3-A19. Levels of streamflow gaging stations, by E. J. Kennedy: USGS—TWRI Book 3, Chapter A19. 1990. 27 pages. PUBLICATIONS ON TECHNIQUES OF HATER-RESOURCES INVESTIGATIONS—Continued 3-B1. Aquifer-test design, observation, and data analysis, by R. W. Stallman: USGS—TWRI Book 3, Chapter Bl. 1971. 26 pages. 3-B2. Introduction to ground-water hydraulics, a programmed text for self-instruction, by G. D. Bennett: USGS—TWRI Book 3, Chapter B2. 1976. 172 pages. 3-B3. Type curves for selected problems of flow to wells in confined aquifers, by J. E. Reed: USGS—TWRI Book 3, Chapter B3. 1980. 106 pages. 3-B4. Regression modeling of ground-water flow, by Richard L. Cooley and Richard L. Naff: USGS—TWRI Book 3, Chapter B4. 1990. 232 pages. 3-B5. Definition of boundary and initial conditions in the analysis of saturated ground-water flow systems--An introduction, by 0. L. Franke, T. E. Reilly, and G. D. Bennett: USGS—TWRI Book 3, Chapter B5. 1987. 15 pages. 3-B6. The principle of superposition and its application in ground-water hydraulics, by T. E. Reilly, 0. L. Franke, and G. D. Bennett: USGS—TWRI Book 3, Chapter B6. 1987. 28 pages. 3-C1. Fluvial sediment concepts, by H. P. Guy: USGS—TWRI Book 3, Chapter Cl. 1970. 55 pages. 3-C2. Field methods for measurement of fluvial sediment, by H. P. Guy and V. W. Norman: USGS—TWRI Book 3, Chapter C2. 1970. 59 pages. 3-C3. Computation of fluvial-sediment discharge, by George Porterfleld: USGS—TWRI Book 3, Chapter C3. 1972. 66 pages. 4-A1. Some statistical tools in hydrology, by H. C. Rlggs: USGS—TWRI Book 4, Chapter Al. 1968. 39 pages. 4-A2. Frequency curves, by H. C. Rlggs: USGS—TWRI Book 4, Chapter A2. 1968. 15 pages. 4-B1. Low-flow investigations, by H. C. Rlggs: USGS—TWRI Book 4, Chapter Bl. 1972. 18 pages. 4-B2. Storage analyses for water supply, by H. C. Rlggs and C. H. Hardlson: USGS—TWRI Book 4, Chapter B2. 1973. 20 pages. 4-B3. Regional analyses of streamflow characteristics, by H. C. Rlggs: USGS—TWRI Book 4, Chapter B3. 1973. 15 pages. 4-D1. Computation of rate and volume of stream depletion by wells, by C. T. Jenkins: USGS-TWRI Book 4, Chapter Dl. 1970. 17 pages. 5-A1. Methods for determination of inorganic substances in water and fluvial sediments, by M. J. Fishman and L. C. Friedman: USGS—TWRI Book 5, Chapter Al. 1989. 545 pages. 5-A2. Determination of minor elements in water by emission epectroscopy, by P. R. Barnett and E. C. Hallory, Jr.: USGS--TWRI Book 5, Chapter A2. 1971. 31 pages. 5-A3. Methods for the determination of organic substances in water and fluvial sediments, edited by R. L. Wershaw, M. J. Fishman, R. R. Grabbe, and L. E. Lowe: USGS—TWRI Book 5, Chapter A3. 1987. 80 pages. 5-A4. Methods for collection and analysis of aquatic biological and microbiological samples, by L. J. Brltton and P. E. Greeson, editors: USGS—TWRI Book 5, Chapter A4. 1989. 363 pages. 5-A5. Methods for determination of radioactive substances in water and fluvial sediments, by L. L. Thatcher, V. J. Janzer, and K. W. Edwards: USGS—TWRI Book 5, Chapter A5. 1977. 95 pages. 5-A6. Quality assurance practices for the chemical and biological analyses of water and fluvial sediments, by L. C. Friedman and D. E. Erdmann: USGS—TWRI Book 5, Chapter A6. 1982. 181 pages. 5-C1. Laboratory theory and methods for sediment analysis, by H. P. Guy: USGS—TWRI Book 5, Chapter Cl. 1969. 58 pages. 6-A1. A modular three-dimensional finite-difference ground-water flaw model, by M. G. McDonald and A. W. Harbaugh: USGS—TWRI Book 6, Chapter Al. 1988. 586 pages. 7-C1. Finite difference model for aquifer simulation in two dimensions with results of numerical experiments, by P. C. Trescott, G. F. Finder, and S. P. Larson: USGS—TWRI Book 7, Chapter Cl. 1976. 116 pages. 7-C2. Computer model of two-dimensional solute transport and dispersion in ground water, by L. F. Konikow and J. D. Bredehoeft: USGS—TWRI Book 7, Chapter C2. 1978. 90 pages. 7-C3. A model for simulation of flow in singular and interconnected channels, by R. W. Schaffrannek, R. A. Baltzer, and D. E. Goldberg: USGS—TWRI Book 7, Chapter C3. 1981. 110 pages. 8-A1. Methods of measuring water levels in deep wells, by M. S. Garber and F. C. Koopman: USGS—TWRI Book 8, Chapter Al. 1968. 23 pages. 8-A2. Installation and service manual for U.S. Geological Survey manometers, by J. D. Craig: USGS—TWRI Book 8, Chapter A2. 1983. 57 pages. 8-B2. Calibration and maintenance of vertical-axis type current meters, by G. F. Smoot and C. E. Novak: USGS—TWRI Book 8, Chapter B2. 1968. 15 pages. 50 THIS PAGE WAS LEFT BLANK INTENTIONALLY Surface and Quality-of-Water Records Puerto Rico 51 52 THIS PAGE WAS LEFT BLANK INTENTIONALLY 53 O C E A N O ATLANTIC O Drainage boundaries indeterminate in limestone terrone Rib Grands oe Anasco teastii > 105 EXPLANATION SURFACE-WATER STATION AND NUMBER ^0105 QUALfTY-OF-WATER STATION AND NUMBER r7n<«,n« QUALfTY-OF-WATER PARTIAL RECORD V010720 STATION AND NUMBER • 165 WELL AND WELL NUMBER -Map area 5 eK)L0MrrE8$ Figure 12.—Rio Guajataca basin. 54 RIO GUAJATACA BASIN 50010500 RIO GUAJATACA AT LARES, PR LOCATION.--Lat 18°18'01", long 66°52'24", Hydrologic Unit 21010001 at bridge on Highway 111, 0.1 mi (0.2 km) upstream from Quebrada Anon, and 0.4 mi (0.6 km) east of Lares. DRAINAGE AREA.--3.16 mi a (8.18 kma ). WATER-DISCHARGE RECORDS PERIOD OP RECORD.—February 1959 to February 1962 (annual low-flow measurements only), January 1963 to April 1969 (monthly measurements only). May 1969 to December 1970 (February to May 1971 and March 1974 to November 1989 monthly measurements only), December 1989 to September 1990. GAGE.—Water-stage recorder and crest-stage gage. Elevation of gage is 935 ft (285 m), from topographic map. REMARKS.--Records fair. Gage-height and precipitation satellite telemetry at station. Small diversion above station for sewage treatment plant; effluent re-enters stream below station. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 3,400 ftVs (96.3 m3/s) May 8, 1990, gage-height 18.32 ft (5.584 m), from rating curve extended above 100 ft3/s (2.832 m3 /s) on basis of step-backwater analysis and slope area measurement of peak flow; minimum daily discharge, 0.60 ftVs (0.017 m3/s), Mar. 22-25,30, Apr. 1, 1970. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,000 ft3/8 (28.3 mVs) and maximum (*): Discharge Time (ftVs) (mVs) Gage height (ft) (m) Date May 8 1530 *3,400 96.3 *18.32 5.584 Minimum daily discharge, 0.72 ftVs ( 0.020 mVs), Aug. 7. Date Sept. 30 Discharge Time (ft3/s) (m3/s) 1445 1,280 36.2 Gage height (ft) (m) 13.61 4.148 DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES DEC FEB MAR JUN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC-FT CFSM IN. ___ ___ ___ ___ --- ___ ___ ___ ___ --- ___ ___ ___ ___ --- ___ ___ ___ 2.8 2.4 1.8 1.7 1.6 1.8 1.7 2.1 1.5 9.9 3.5 2.1 29 ___ ___ ___ ___ ___ ___ 4.2 3.7 2.0 1.6 1.5 1.6 1.6 1.4 1.6 1.3 1.4 1.2 1.2 1.1 1.2 1.2 1.3 1.4 1.2 1.5 1.5 1.4 1.4 1.5 1.5 1.6 1.9 1.7 1.3 1.6 1.3 49.9 1.61 4.2 1.1 99 .51 .59 1.4 1.3 1.1 .82 1.1 .86 1.1 1.2 .94 1.1 .76 .75 .84 2.4 .96 .97 .99 .94 1.7 1.1 1.1 2.4 1.4 .95 .86 1.3 .86 1.2 ___ ___ --- 32.40 1.16 2.4 .75 64 .37 .38 1.5 1.1 1.1 1.3 1.7 2.8 .92 .89 2.7 2.1 2.7 6.4 2.9 1.5 1.1 1.3 1.2 2.1 1.1 1.3 1.2 1.1 12 1.9 1.3 1.3 .96 .87 1.3 1.2 .96 61.80 1.99 12 .87 123 .63 .73 1.3 7.8 1.7 1.1 .96 .92 .95 .91 1.0 .88 1.0 .85 1.1 1.1 1.3 4.5 1.1 39 4.6 6.9 1.4 1.4 1.1 1.5 .90 .91 .85 .80 .81 .87 --- 89.51 2.98 39 .80 178 .94 1.05 .79 .80 .76 .75 .94 .78 33 170 68 17 14 6.5 . 4.6 3.7 2.9 2.9 2.7 2.3 3.7 3.1 2.9 2.8 2.1 3.0 2.4 2.8 2.2 2.7 1.8 7.8 2.4 372.12 12.0 170 .75 738 3.80 4.38 5.2 2.6 2.0 7.0 29 13 5.0 4.1 3.6 2.7 6.4 4.3 3.1 15 46 9.5 21 9.8 6.0 4.7 4.4 3.6 4.2 5.9 4.5 3.6 2.7 2.4 2.3 2.1 --- 235.7 7.86 46 2.0 468 2.49 2.77 2.0 1.9 2.0 1.9 2.3 2.1 2.3 1.9 2.3 1.7 1.5 1.6 1.1 1.6 1.5 1.4 2.2 1.4 1.5 1.5 1.1 1.1 1.5 1.9 6.8 1.6 .95 .93 .77 .73 10 63.08 2.03 10 .73 125 .64 .74 1.4 1.5 1.1 .80 .74 .89 .72 1.0 22 3.7 15 3.9 6.6 2.8 1.5 1.3 1.4 1.6 1.4 1.0 1.4 1.1 1.1 17 3.3 1.6 1.3 1.7 1.3 1.9 1.8 103.85 3.35 22 .72 206 1.06 1.22 1.9 1.7 5.7 27 37 8.5 11 10 26 11 5.8 8.8 18 14 14 7.1 47 15 14 25 11 7.9 6.9 20 8.3 6.4 5.3 5.1 4.6 88 472.0 15.7 88 1.7 936 4.98 5.56 RIO GUAJATACA BASIN 50010500 RIO GUAJATACA AT LARES, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORD.--Water years 1958-71, 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 55 DATE OCT 1989 11. . . DEC 07. .. FEB 1990 05. .. MAY 01. . . JUN 19. . . AUG 16. . . TIME 1245 1345 1400 1015 1130 0940 DIS- CHARGE, INST. CUBIC FEET PER SECOND 9.4 2.7 0.97 0.70 6.0 1.7 SPE- CIFIC CON- DUCT- ANCE (US/CM) 210 229 212 289 258 296 PH (STAND- ARD UNITS) 7.50 7.20 8.20 7.60 7.80 7.90 TEMPER- ATURE WATER (DEG C) 22.5 23.0 22.0 21.5 23.5 24.0 TUR- BID- ITY (NTU) 2.0 0.80 1.0 2.0 10 3.0 OXYGEN, DIS- SOLVED (MG/L) 8.1 9.2 9.3 6.2 8.2 7.0 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 96 110 108 72 97 84 OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 16 21 11 16 14 12 COLI- FORM, FECAL, 0.7 UM-MP (COLS./ 100 ML) K1100 K14000 560 K1300 K1800 K990 STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) 3000 7300 470 3600 K1800 4200 DATE OCT 1989 11. . . DEC 07. .. FEB 1990 05. . . MAY 01. .. JUN 19. .. AUG 16. .. HARD- NESS TOTAL (MG/L AS HARD- NESS NONCARB WH WAT TOT FLD MG/L AS CALCIUM DIS- SOLVED (MG/L MAGNE- SIUM, DIS- SOLVED (MG/L SODIUM, DIS- SOLVED (MG/L SODIUM AD- SORP- TION RATIO POTAS- SIUM, DIS- SOLVED (MG/L ALKA- LINITY WAT WH TOT FET FIELD MG/L AS SULFIDE TOTAL (MG/L SULFATE DIS- SOLVED (MG/L CHLO- RIDE, DIS- SOLVED (MG/L CACO3) CACO3 92 110 120 AS CA) AS MG) AS NA) 4.8 11 33 36 7.0 15 7 .3 14 AS K) 0.5 2.1 0.6 2.2 0.6 2.6 CACO3 87 90 89 150 85 120 AS S) AS SO4) AS CL) <0.5 6.0 10 <0.5 20 13 9.6 13 DATE OCT 1989 11. .. DEC 07. .. FEB 1990 05.. . MAY 01.. . JUN 19.. . AUG 16. . . FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.10 -- -- 0.50 -- <0.10 SILICA, DIS- SOLVED (MG/L AS SI02) 26 -- -- 33 -- 31 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 135 -- -- 190 -- 189 RESIDUE SOLIDS, TOTAL DIS- AT 105 SOLVED DEG. C, (TONS SUS- PER FENDED DAY) (MG/L) 3.41 10 <1 <1 .36 5 <1 .88 <1 NITRO- GEN, NITRATE TOTAL (MG/L AS N) -- 1.83 -- 0.69 1.49 -- NITRO- GEN, NITRITE TOTAL (MG/L AS N) <0.01 0.17 <0.01 0.01 0.01 <0.01 NITRO- GEN, NO2+NO3 TOTAL (MG/L AS N) 2.2 2.0 1.1 0.70 1.5 1.0 NITRO- GEN, AMMONIA TOTAL (MG/L AS N) 0.01 0.27 <0.01 0.01 0.03 <0.01 NITRO- GEN, ORGANIC TOTAL (MG/L AS N) 0.39 0.83 -- 0.39 0.27 -- K = non-ideal count 56 RIO GUAJATACA BASIN 50010500 RIO GUAJATACA AT LARES, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 11. .. DEC 07.. . FEB 1990 05... MAY 01.. . JUN 19.. . AUG 16... DATE OCT 1989 11.. . DEC 07.. . FEB 1990 05.. . MAY 01.. . JUN 19.. . AUG 16.. . NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.40 1.1 0.20 0.40 0.30 0.30 IRON, TOTAL RECOV- ERABLE (UG/L AS FB) 270 -- -- 320 -- -- NITRO- GEN, TOTAL (MG/L AS N) 2.6 3.1 1.3 1.1 1.8 1.3 LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) 6 — — 2 — — NITRO- GEN, TOTAL (MG/L AS NO3) 12 14 5.8 4.9 8.0 5.8 MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) 40 -- -- 40 __ -- PHOS- PHORUS ARSENIC TOTAL TOTAL (MG/L (UG/L AS P) AS AS) 0.05 <1 0.12 0.06 0.06 2 0.17 0.07 MERCURY TOTAL SELE- RECOV- NIUM, ERABLE TOTAL (UG/L (UG/L AS HO) AS SB) <0.10 <1 — — <0.10 <1 — — BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 — — <100 -- -- SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) <1 — — <1 — — BORON, TOTAL RECOV- ERABLE (UG/L AS B) 50 -- -- <10 -- — — ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) <10 -_ __ <10 __ __ CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 — — <1 -- — — CYANIDE TOTAL (MG/L AS CN) <0.010 — — <0.010 — — CHRO- MIUM, COPPER, TOTAL TOTAL RECOV- RECOV- ERABLE ERABLE (UG/L (UG/L AS CR) AS CU) <1 <10 __ __ <1 10 — — — — — MBTHY- LENB BLUE ACTIVE PHENOLS SUB- TOTAL STANCE (UG/L) (MG/L) 5 0.04 __ __ 3 0.04 __ __ RIO GUAJATACA BASIN 57 50011000 CANAL PRINCIPAL DE DIVERSIONES AT LAGO DE GUAJATACA, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°24'02", long 66°55'27", off Highway 476 at Lago Guajataca outlet, 3.0 mi (4.8 km) southwest of Segunda Unidad Baldorioty de Castro, and 5.3 mi (8.5 km) south of Quebradillas Plaza. DRAINAGE AREA.--Indeterminate. PERIOD OP RECORD.--Water years 1958-64, 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 11. . . DEC 11. . . PEB 1990 05. . . MAY 08. .. JUN 25. . . AUG 20. .. TIME 0930 1230 1600 1225 1445 1345 DIS- CHARGE, INST. CUBIC FEET PER SECOND 50 150 100 100 120 100 SPE- CIFIC CON- DUCT- ANCE (US/CM) 315 300 313 298 317 295 PH (STAND- ARD UNITS) 6.90 7.00 7.80 7.80 7.40 7.50 TEMPER- ATURE WATER (DEC C) 25.0 25.0 24.5 27.0 25.5 27.5 TUR- BID- ITY (NTU) 3.2 0.70 1.2 1.2 1.2 2.6 OXYGEN, DIS- SOLVED (MG/L) 0.6 1.6 3.8 2.4 1.6 3.7 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 7 19 46 32 20 46 OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 29 21 22 22 19 23 COLI- PORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) K82 K10 K10 30 K23 K8 STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) K70 K10 K10 130 56 96 DATE OCT 1989 11. .. DEC 11. . . FEB 1990 05. . . MAY 08. . . JUN 25. . . AUG 20. .. HARD- NESS TOTAL (MG/L AS HARD- NESS NONCARB WH WAT TOT PLD MG/L AS CALCIUM DIS- SOLVED (MG/L MAGNE- SIUM, DIS- SOLVED (MG/L SODIUM, DIS- SOLVED (MG/L SODIUM AD- SORP- TION RATIO POTAS- SIUM, DIS- SOLVED (MG/L ALKA- LINITY WAT WH TOT PET FIELD MG/L AS SULFIDE TOTAL (MG/L SULFATE DIS- SOLVED (MG/L CHLO- RIDE, DIS- SOLVED (MG/L CAC03 ) 130 CAC03 AS CA) AS MG) AS NA) 160 0 56 47 150 7 52 4.0 6.9 4.1 6.6 4.1 6.8 AS K) 0.2 1.9 0.2 1.9 0.2 1.9 CAC03 140 140 130 130 140 140 AS S) AS SO4 ) AS CL) <0.5 11 9.3 <0.5 9.8 14 11 11 SOLIDS, RESIDUE DATE OCT 1989 11. .. DEC 11.. . PEB 1990 05.. . MAY 08.. . JUN 25.. . AUG 20.. . FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.10 -- -- 0.10 -- 0.10 SILICA, DIS- SOLVED (MG/L AS SI02) 7.0 -- -- 6.4 -- 6.2 SUM OF CONSTI - TUENTS, DIS- SOLVED (MG/L) 180 -- -- 165 -- 177 SOLIDS, DIS- SOLVED (TONS PER DAY) 24.2 -- -- -- -- 48.7 TOTAL AT 105 DEC. C, SUS- PENDED (MG/L) 3 12 10 9 6 6 NITRO- NITRO- NITRO- GEN, GEN, GEN, NITRATE NITRITE NO2+NO3 TOTAL TOTAL TOTAL (MG/L (MG/L (MG/L AS N) AS N) AS N) 0.38 0.05 0.07 0.02 <0.01 0.05 <0.01 0. 03 <0.01 0.40 <0.10 <0.10 <0.10 <0.10 <0.10 NITRO- GEN, AMMONIA TOTAL (MG/L AS N) 0. 19 0.03 0.06 0.01 0.39 0.19 NITRO- GEN, ORGANIC TOTAL (MG/L AS N) 0.31 0.27 0.74 0.29 0.31 0.31 K = non-ideal count 58 RIO GOAJATACA BASIN 50011000 CANAL PRINCIPAL DE DIVERSIONES AT LAGO DB GUAJATACA, PR—Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 11.. . DEC 11.. . FBB 1990 05.. . HAY 08.. . JDN 25... AUG 20.. . OCT 1989 11.. . DEC 11.. . FBB 1990 05.. . HAY 08.. . JDN 25.. . AUG 20.. . NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.50 0.30 0.80 0.30 0.70 0.50 IRON, TOTAL RECOV- ERABLE (UG/L AS FE) NITRO- GEN, TOTAL (MG/L AS N) 0.90 — — — — — LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) NITRO- GEN, TOTAL (MG/L AS N03) 4.0 -- -- — — -- MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) PHOS- PHORUS TOTAL (MG/L AS P) 0.03 0.03 0.04 0.03 0.02 0.02 MERCURY TOTAL RECOV- ERABLE (UG/L AS HG) ARSENIC TOTAL (UG/L AS AS) 2 -- -- 1 -- -- SELE- NIUM, TOTAL (UG/L AS SB) BARI0H, TOTAL RECOV- ERABLE (UG/L AS BA) <100 — — <100 — — SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) BORON, TOTAL RECOV- ERABLE (UG/L AS B) <10 -- -- 10 -- -- ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 — — <1 — — CYANIDE TOTAL (MG/L AS CN) CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) <1 — -- 1 — -- PHENOLS TOTAL (OG/L) COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) <10 — — <10 -- — MBTHY- LBNB BLUE ACTIVE SUB- STANCE (MG/L) 240 80 130 60 •cO.10 •cO.10 <1 <1 •cO.010 •cO.010 <1 0.06 0.04 RIO GUAJATACA BASIN 50011400 RIO GOAJATACA ABOVE MOUTH NEAR QUEBRADILLAS, PR WATER-QUALITY RECORDS PERIOD OF RECORD.—Water years 1969 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 59 DATE OCT 1989 11. . . DEC 11. . . FEB 1990 06. . . MAY 08. .. JUN 25... AUG 20. .. TIME 0715 1500 0845 1110 1710 1615 DIS- CHARGE, INST. CUBIC FEET PER SECOND 22 9.1 8.6 9.0 14 9.6 SPE- CIFIC CON- DUCT- ANCE (OS/CM) 448 510 624 520 446 528 PH (STAND- ARD UNITS) 7.00 7.30 7.50 7.40 7.70 7.70 TEMPER- ATURE WATER (DBG C) 23.5 24.0 23.0 25.5 25.5 26.5 TUR- BID- ITY (NTU) 1.6 0.40 0.40 1.0 1.0 1.0 OXYGEN, DIS- SOLVED (MG/L) 5.7 7.4 4.6 5.8 7.0 9.4 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 66 86 52 67 85 115 OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 16 17 13 28 15 28 COLI- FORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) 220 K40 K90 K100 490 K26 STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) 590 K50 K18 200 520 K18 DATE OCT 1989 11. .. DEC 11. .. FBB 1990 06. .. MAY 08. .. JUN 25. .. AUG 20... HARD- NESS TOTAL (MG/L AS HARD- NESS NONCARB WH WAT TOT FLD MG/L AS CALCIUM DIS- SOLVED (MG/L MAGNE- SIUM, DIS- SOLVED (MG/L SODIUM, DIS- SOLVED (MG/L SODIUM AD- SORP- TION RATIO POTAS- SIUM, DIS- SOLVED (MG/L ALKA- LINITY WAT WH TOT PET FIELD MG/L AS SULFIDB TOTAL (MG/L SULFATB DIS- SOLVED (MG/L CHLO- RIDE, DIS- SOLVED (MG/L CAC03) CAC03 210 220 AS CA) AS MG) AS NA) 72 75 210 8 72 6.5 16 8.8 21 7.1 15 AS K) 0.5 1.2 0.6 2.0 0.5 1.3 CAC03 180 210 220 220 180 190 AS S) AS S04) AS CL) <0.5 9.0 23 <O.S 7.3 36 8.8 25 SOLIDS, RESIDUE DATE OCT 1989 11.. . DEC 11.. . FEB 1990 06.. . MAY 08... JUN 25.. . AUG 20... FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.10 -- -- 0.30 -- 0.10 SILICA, DIS- SOLVED (MG/L AS SI02) 6.6 -- -- 6.2 -- 7.2 SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 242 -- -- 282 -- 250 SOLIDS, DIS- SOLVED (TONS PER DAY) 14.4 -- -- 6.9 — 6.6 TOTAL AT 105 DEG. C, SUS- PENDED (MG/L) <1 6 3 6 2 4 NITRO- GEN, NITRATE TOTAL (MG/L AS N) -- -- -- 2.08 1.29 2.29 NITRO- GEN, NITRITE TOTAL (MG/L AS N) <0.01 <0.01 <0.01 0.02 0.01 0.01 NITRO- GEN, N02+N03 TOTAL (MG/L AS N) 1.5 1.4 2.7 2.1 1.3 2.3 NITRO- GEN, AMMONIA TOTAL (MG/L AS N) 0.02 0.02 0.01 0.02 0.02 0.05 NITRO- GEN, ORGANIC TOTAL (MG/L AS N) 0.48 — 0.39 0.18 — 0.35 K = non-ideal count 60 RIO GDAJATACA BASIN 50011400 RIO GDAJATACA ABOVE MOUTH NEAR QUBBRADILLAS, PR--Continued WATER-QUALITY DATA, HATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 OCT 1989 11. .. DEC 11... FEB 1990 06.. . MAY 08.. . JUN 25.. . AUG 20.. . OCT 1989 11.. . DEC 11... FEB 1990 06.. . HAY 08.. . JUN 25.. . AUG 20.. . NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.50 <0.20 0.40 0.20 <0.20 0.40 IRON, TOTAL RECOV- ERABLE (UG/L AS FE) NITRO- GEN, TOTAL (MG/L AS N) 2.0 — 3.1 2.3 — 2.7 LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) NITRO- GEN, TOTAL (MG/L AS N03) 8.9 -- 14 10 -- 12 MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) PHOS- PHORUS TOTAL (MG/L AS P) 0.02 0.17 0.02 0.02 0.04 <0.01 MERCURY TOTAL RECOV- ERABLE (UG/L AS HG) ARSENIC TOTAL (UG/L AS AS) <1 — -- <1 -- -- SELE- NIUM, TOTAL (UG/L AS SE) BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 — — <100 — -- SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) BORON, TOTAL RECOV- ERABLE (UG/L AS B) <10 -- -- 20 -- -- ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 — — <1 — — CYANIDE TOTAL (MG/L AS CN) CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) <1 -- -- 3 -- -- PHENOLS TOTAL (UG/L) COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) 10 — — <10 — — MBTHY- LENE BLUE ACTIVE SUB- STANCE (MG/L) 90 220 40 20 <0.10 <0.10 <10 <0.010 <0.010 0.03 0.06 O C E A hi /I T L f> N 7 I C O 61 OUEBRADILLAi .—.' HAT a LO CAMlh _} !on»ous and sedirnentory 'oc Dromag* boun EXPLANATION ,0148 SURFACE-WATER STATION AND NUMBER — Mop crea 4 Figure 13.--Rio Camuy basin. 62 RIO CAMUY BASIN 50014800 RIO CAMUY NEAR BAYANEY, PR LOCATION.—Lat 18°23'48", long 66°49'04", Hydrologic Unit 21010002, on left bank at Highway 488, 1.4 mi (2.2 km) southeast of school at Santiago, 0.9 mi (1.4 km) northwest from Escuela Manuel A. Rivera at Bayaney and 9.1 mi (14.6 km) upstream from Atlantic Ocean. DRAINAGE AREA.--Indeterminate. WATER-DISCHARGE RECORDS PERIOD OP RECORD.--May 1984 to current year. GAGE.--Water-stage recorder. Elevation of gage is 341 ft (104 m), from topographic map. REMARKS.--Records fair. Gage-height and precipitation satellite telemetry at station. AVERAGE DISCHARGE.--6 years (1985-90), 110 ft'/s (3.115 m3 /s), 79,700 acre-ft/yr (98.3 hmVyr). EXTREMES FOR PERIOD OP RECORD.--Maximum discharge, 6,450 ft'/s (183 mVs), Oct. 7, 1985, gage height, 17.66 ft (5.383 m), from rating curve extended above 300 ftVs (8.50 mVs) on basis of step-backwater analysis; minimum discharge, 25 ftj/s (0.71 mVs) , Apr. 26-28, 1989. EXTREMES POR CURRENT YEAR.--Peak discharges greater than base discharge of 2,000 ft'/s (56.6 mVs) and maximum (*) i Date Oct. Oct. Oct. 2 3 19 Time 2050 2125 2045 Discharge (ftVs) (mVs) 2, *3, 2, 260 940 310 64 112 65 .0 .4 Gage (ft) 12. *14. 12. 05 97 17 height (m) 3. 4. 3i 673 563 709 Date Oct . 22 July 5 Time 2100 1925 Discharge (ftVs) (mVs) 2,290 64.8 69.4 Gage height (ft) (m) 12.13 3.697 12.50 3.810 Minimum discharge, 29 ftVs ( 0.821 mVs), Mar. 6-9. DISCHARGE, CUBIC PEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES DAY OCT NOV DEC JAN PEB MAR MAY JUN JUL SEP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC-PT CAL YR WTR YR 134 623 1410 954 555 369 238 203 170 147 134 125 115 192 138 137 325 321 611 373 181 582 419 240 175 264 192 149 209 165 140 9990 322 1410 115 19820 1989 1990 133 121 113 108 104 101 98 95 97 146 128 94 88 87 84 79 327 263 110 96 99 92 84 81 78 76 74 72 71 70 --- 3269 109 327 70 6480 TOTAL 38977 TOTAL 34327 69 67 65 64 62 60 60 60 60 59 59 58 57 56 54 54 60 53 52 51 50 49 48 48 47 46 45 65 90 56 126 1850 59.7 126 45 3670 MEAN MEAN 112 76 68 59 54 52 51 50 49 48 46 46 47 46 46 44 43 43 42 41 40 40 39 39 39 40 39 40 38 37 37 1491 48.1 112 37 2960 107 MAX 94.0 MAX 35 35 35 34 34 34 33 38 36 37 37 38 35 49 41 36 35 34 38 39 35 38 37 34 32 32 32 31 ___ _-_ --- 1004 35.9 49 31 1990 1390 MIN 1410 MIN 32 33 31 31 31 30 29 29 35 37 36 77 116 128 77 54 54 46 44 46 44 51 209 151 74 52 47 44 42 41 40 1791 57.8 209 29 3550 25 29 40 40 54 44 38 35 43 36 35 34 33 33 40 37 35 39 81 219 218 201 97 69 52 46 43 45 43 39 37 36 --- 1842 61.4 219 33 3650 35 35 33 33 32 31 85 252 213 197 99 80 66 56 50 47 45 43 41 39 39 37 36 35 34 57 45 35 33 38 65 1966 63.4 252 31 3900 63 104 46 41 52 134 166 72 53 46 42 64 65 46 504 163 110 194 117 80 69 58 61 63 54 50 48 45 43 42 --- 2695 89.8 504 41 5350 40 39 38 36 359 199 138 110 73 59 60 64 50 211 131 74 58 73 68 52 45 40 38 39 42 44 35 33 32 31 36 2347 75.7 359 31 4660 93 49 43 39 40 40 39 38 82 95 55 88 55 81 58 49 46 170 101 53 47 46 69 85 122 67 51 48 47 43 44 1983 64.0 170 38 3930 49 45 44 73 202 155 87 105 470 217 157 112 101 156 186 167 114 115 133 175 132 100 94 134 120 95 86 81 79 315 --- 4099 137 470 44 8130 RIO CAMDY BASIN 50014800 RIO CAMUY NEAR BAYANEY, PR--Continued WATER QUALITY RECORDS 63 PERIOD OP RECORD.--WATER YEARS JUNE 1984 TO CURRENT YEAR STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TORE (CPS) (UMHOS) (DEC C) OCT. 13 1442 NOV. 16 1228 DEC. 08 1658 11 1132 15 1026 16 0956 JAN. FEB. MAR. 119 85.3 61.6 45.8 41.2 52.7 180 146 266 268 285 150 25.0 26.0 26.0 23.0 25.0 20.0 DATE TIME APR. 12 1125 MAY 17 1212 JUNE 07 1105 JULY 19 1428 AUG. 09 1020 SEPT 14 1151 STREAMFLOW, INSTANTANEOUS (CFS) 33.3 44.3 164 62.1 39.3 128 SPECIFIC CON- TEMPERA- DUCTANCE TURE (UMHOS) (DEC C) 325 286 300 306 320 240 22.0 23.0 23.0 20.0 20.0 22.0 64 RIO CAMOY BASIN 50015700 RIO CAMUY NEAR HATILLO, PR LOCATION.--Lat 18°27'44", long 66°49'56", Hydrologic Unit 21010002, 1.8 mi (2.9 km) southwest of Hatillo plaza, and 1.8 mi (2.9 km) southeast of Camuy plaza, 1.2 mi (1.9 km) south of Planta de Purificacion, and 3.3 mi (5.5 km) upstream from Atlantic Ocean. DRAINAGE AREA.--Indeterminate. WATER-DISCHARGE RECORDS PERIOD OF RECORD.--June 1984 to current year. GAGE.--Water-stage recorder. Elevation of gage is 13 ft (4 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. Gage-height and precipitation satellite telemetry at station. AVERAGE DISCHARGE.--6 years (1985-90), 177 ft3 /s (5.013 m'/s), 128,200 acre-ft/yr (158 hmVyr) . EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 10,500 ft'/s (297 m'/s), Oct. 7, 1985, gage height, 24.75 ft (7.544 m), from rating curve extended above 200 ft3 /s (5.66 m3 /s) on basis of step-backwater analysis; minimum daily discharge, 25 ft3 /s (0.708 m3/s), May 30. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 2,500 ft 3 /s (70.8 m3 /s) and maximum (*): Date Oct. Oct. Oct. 2 3 19 Time 2325 2345 2320 Discharge (ft 3 /s) (mVs) 4,470 *7,150 3,860 126 202 109 Gage height (ft) (m) 18.34 •21.66 17.35 5.590 6.602 5.288 Date Oct. 22 July 5 Sept . 9 Time 2400 2300 2245 Discharge (ft 3 /s) (m3 /s) 3,740 5,790 2,760 106 164 78.2 Gage height (ft) (m) 17.15 20.13 15.32 5.227 6.136 4.670 Minimum daily discharge, 25 ft 3 /s (0.708 m3 /s), May 30. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES DAY OCT NOV DEC JAN JUN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN CAL YR WTR YR 219 858 2450 2520 991 667 311 232 207 159 138 124 115 230 191 137 331 666 750 977 308 636 987 386 239 485 455 233 323 307 220 16852 544 2520 115 1989 1990 199 170 160 148 138 134 129 120 126 188 244 126 114 118 110 101 417 676 160 129 130 123 105 102 97 95 91 88 85 84 --- 4707 157 676 84 TOTAL 59552 TOTAL 49721 83 80 78 77 75 74 74 70 67 67 66 64 63 62 62 61 68 60 60 60 59 58 58 57 56 56 56 55 137 78 e!40 2181 70.4 140 55 MEAN MEAN e!23 e82 e74 e64 e58 63 61 58 56 54 52 52 52 52 54 51 52 51 51 49 47 47 45 46 47 49 47 49 46 46 44 1722 55.5 123 44 163 MAX 136 MAX 41 41 40 41 41 40 38 43 46 48 46 43 39 50 48 44 42 38 43 43 38 42 41 37 35 35 34 34 _.- ___ --- 1151 41.1 50 34 2530 MIN 34 2520 MIN 25 38 36 33 33 32 32 31 31 34 41 35 87 192 202 99 67 68 55 49 53 49 56 449 456 111 71 62 54 49 47 45 2697 87.0 456 31 46 50 58 49 43 41 46 41 38 38 36 36 49 43 41 41 79 165 442 315 132 83 59 49 46 50 49 44 42 41 --- 2292 76.4 442 36 39 39 38 38 37 37 48 287 370 348 155 82 66 52 45 41 39 37 34 32 32 30 29 28 27 43 50 29 26 25 58 2241 72.3 370 25 43 128 45 34 43 105 247 68 42 33 29 47 50 35 1010 249 108 248 186 82 65 51 51 61 48 42 38 35 32 31 --- 3286 110 1010 29 31 30 29 29 760 1450 262 252 99 71 72 100 57 331 387 169 76 89 91 58 50 47 46 65 60 60 47 44 42 41 39 4984 161 1450 29 117 72 59 51 46 48 43 43 51 140 63 89 60 e82 e66 e54 e50 e!80 e!20 e70 e54 e49 e66 e89 el!5 elOO e60 48 48 44 42 2219 71.6 180 42 52 45 43 76 179 299 93 113 692 505 213 135 104 177 310 293 139 175 135 235 e!60 e!20 e!05 e!40 170 89 75 e74 84 359 --- 5389 180 692 43 e Estimated RIO CAMDY BASIN 50015700 RIO CAMCTY NEAR HATILLO, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS AUGUST 1984 TO CURRENT YEAR STREAMFLOW, TIME INSTANTANEOUS (CFS) SPECIFIC CON- TEMPERA- DUCTANCE TURE (UMHOS) (DEC C) OCT. NOV. DEC. JAN. FEB. MAR. 13 1055 16 0914 08 1122 11 0906 15 0750 16 0736 115 102 49 51. 50. 68.2 232 148 294 286 295 330 24.0 24.0 26.0 24.0 22.0 22.0 DATE TIME APR. 12 0820 MAY 17 0912 JUNE 07 1554 JULY 19 1050 AUG. 09 1257 SEPT 12 1458 STREAMFLOW, INSTANTANEOUS (CFS) 35.3 39.7 172 92.7 39.5 123 65 SPECIFIC CON- TEMPERA- DUCTANCE TURE (UMHOS) (DE6 C) 323 326 290 349 330 310 23.0 22.0 22.0 20.0 20.0 23.0 66 THIS PAGE WAS LEFT BLANK INTENTIONALLY Drainage boundaries indeterminate in limestone terrane Igneous and . edimentary rocks 0280 Rio Grande de '. "\ Aftosco basin j \ ^»«»'' Ri'o Portugue's Logo \ \ basin rxx.i-.^" W0205 QUALrrY-OF-WATER STATION AND NUMBER V no_. .„ QUALtTY-OF-WATER PARTIAL RECORD 025110 STATK)N AMD NUMBER ^204 Figure 14.--Rio Grande de Arecibo basin. 68 RIO GRANDB DB ARECIBO BASIN 50020500 RIO GRANDB DB ARECIBO NEAR ADJUNTAS, PR WATER-QUALITY RECORDS LOCATION.—Lat 18°10'54", long 66044'12", at Highway 135 bridge, 1.0 mi (1.6 km) upstream from Lago Adjuntas, and 1.5 mi (2.4 km) northwest of Adjuntas plaza. DRAINAGE AREA.--12.7 mi> (32.9 km>) this does not include 6.0 mi a (15.6 km>) above Lago Garzas. PERIOD OF RECORD.—Water years 1969-74, 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 25. .. DEC 18... FEB 1990 15... APR 18... JUN 11. .. ADG 15. .. TIME 1400 1345 1100 1315 1140 1015 DIS- CHARGE, INST. CUBIC FEET PER SECOND 103 19 11 9.0 8.1 8.1 SPE- CIFIC CON- DUCT- ANCE (US/CM) 216 295 319 358 323 420 PH (STAND- ARD UNITS) 7.20 8.10 8.20 8.00 8.00 8.00 TEMPER- ATURE WATER (DBG C) 23.5 22.0 20.0 26.0 26.0 25.0 TUR- BID- ITY (NTU) 2.6 1.2 1.4 2.9 1.8 1.5 OXYGEN, DIS- SOLVED (MG/L) 7.9 9.0 7.6 8.0 8.6 8.8 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 96 106 85 102 110 110 OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 14 18 16 21 21 16 COLI- FORM, FECAL, 0.7 UM-MP (COLS./ 100 ML) 2400 1200 310 K7200 K140 K860 STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) 480 630 540 530 250 2400 DATE OCT 1989 25... DEC 18... FEB 1990 15... APR 18. .. JUN 11. .. AUG 15. .. HARD- HARD- NESS NESS NONCARB CALCIUM TOTAL WH WAT DIS- (MG/L TOT FLD SOLVED AS MG/L AS (MG/L CACO3) CACO3 MAGNE- SIUM, SODIUM, DIS- DIS- SOLVED SOLVED (MG/L (MG/L AS CA) AS MG) AS NA) 78 0 20 6.8 13 120 0 32 9.8 21 140 15 36 11 34 SODIUM AD- SORP- TION RATIO 0.6 — -- 0.8 — 1 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 1.6 — — 2.2 ~ 2.3 ALKA- LINITY WAT WH TOT PET FIELD MG/L AS CACO3 79 110 110 110 120 120 SULFIDB TOTAL (MG/L AS S) 0.8 — — 0.8 — — SULFATE DIS- SOLVED (MG/L AS SO4) 8.0 — — 11 — 8.3 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 12 — — 24 — 53 DATE OCT 1989 25... DEC 18.. . FEB 1990 15... APR 18.. . JUN 11.. . AUG 15... FLUO- RIDB, DIS- SOLVED (MG/L AS F) 0.10 -- -- 0.20 -- 0.10 SILICA, DIS- SOLVED (MG/L AS SIO2) 28 — — 30 — 32 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 137 __ -- 197 -- 249 SOLIDS, DIS- SOLVED (TONS PER DAY) 38.1 — — 4.80 — 5.56 RESIDUE TOTAL AT 105 DBG. C, SUS- PENDED (MG/L) 1 29 11 6 <1 5 NITRO- GEN, NITRATE TOTAL (MG/L AS N) 1.19 1.38 1.16 0.97 1.06 0.59 NITRO- GEN, NITRITE TOTAL (MG/L AS N) 0.01 0.12 0.14 0.13 0.14 0.11 NITRO- GEN, N02+N03 TOTAL (MG/L AS N) 1.2 1.5 1.3 1.1 1.2 0.7 NITRO- GEN, AMMONIA TOTAL (MG/L AS N) 0.090 0.10 0.04 0.11 0.22 0.12 NITRO- GEN, ORGANIC TOTAL (MG/L AS N) 0.21 0.30 0.46 0.39 0.0 0.58 non-ideal count RIO GRANDE DB ARBCIBO BASIN 50020500 RIO GRANDE DB ARECIBO NR ADJUNTAS, PR—Continued WATER QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 69 DATE OCT 1989 25.. . DEC 18... FBB 1990 15... APR 18... JX7N 11... AUG 15... DATE OCT 1989 25. . . DEC 18... FEB 1990 15... APR 18.. . JX7N 11.. . AUG 15.. . NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.30 0.40 0.50 0.50 0.20 0.70 IRON, TOTAL RECOV- ERABLE (UG/L AS FE) 240 -- -- 380 -- -- NITRO- GEN, TOTAL (MG/L AS N) 1.5 1.9 1.8 1.6 1.4 1.4 LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) 4 -- — 1 — -- NITRO- GEN, TOTAL (MG/L AS NO3) 6.6 8.4 8.0 7.1 6.2 6.2 MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) 40 -- -- 120 -- -- PHOS- PHORUS ARSENIC TOTAL TOTAL (MG/L (UG/L AS P) AS AS) 0.06 <1 0.17 0.20 0.24 <1 0.18 0.21 MERCURY TOTAL SELE- RECOV- NIUM, ERABLB TOTAL (UQ/L (UG/L AS HG) AS SE) <0.10 <1 __ __ <0.10 <1 __ — BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 — -- <100 — — SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) <1 -- — <1 — — BORON, TOTAL RECOV- ERABLE (UG/L AS B) <10 -- -- 50 -- -- ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) 10 -- -- <10 -- -- CHRO- CADMIUM MIUM, TOTAL TOTAL RECOV- RECOV- ERABLE ERABLB (UG/L (UG/L AS CD) AS CR) <1 <1 — __ <1 1 __ -- CYANIDE TOTAL PHENOLS (HG/L TOTAL AS CN) (UG/L) •cO.010 «1 __ __ •cO.010 7 __ __ COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) <10 -- -- <10 -- -- METHY- LENE BLUE ACTIVE SUB- STANCE (MG/L) 0.02 -- -- 0.06 -- — 70 RIO GRANDB DE ARBCIBO BASIN 50025000 RIO GRANDB DE ARBCIBO NEAR UTUADO, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°18'11", long 66°41'59", at bridge near Highway 10 at km 56.4, 0.5 mi (0.8 km) downstream from Rio de Caguana, and 2.5 mi (4.0 km) north of Utuado plaza. DRAINAGE AREA.--66.0 mi' (170.9 km') this excludes 6.0 mi' (15.5 km*) upstream from Lago Qarzas to Rio Guayanes in the Rio Tallaboa basin. PERIOD OF RECORD.--Water years 1959-74, 1979 to current year. WATER-QUALITY DATA, HATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 04... NOV 29... FBB 1990 20. .. APR 16... JUN 11. .. AUG 15. .. TIME 1100 1115 1010 1230 1400 1245 DIS- CHARGE, INST. CUBIC FEET PER SECOND 403 120 50 35 23 37 SPE- CIFIC CON- DUCT- ANCE (US /CM) 205 255 278 294 291 273 PH (STAND- ARD UNITS) 7.70 7.90 7.20 8.40 8.20 8.00 TEMPER- ATURE HATER (DBG C) 25.0 23.0 21.5 29.0 31.5 29.5 TUR- BID- ITY (NTU) 31 2.4 1.5 38 2.0 2.5 OXYGEN, DIS- SOLVED (MG/L) 8.3 8.8 9.2 7.4 7.1 6.5 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 100 102 102 96 96 85 OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 11 <10 12 16 19 14 COLI- FORM, FECAL, 0.7 UH-MF (COLS./ 100 ML) 210000 2100 31000 K11000 360 K770 STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) 3000 430 K13000 930 K110 310 DATE OCT 1989 04... NOV 29. .. FBB 1990 20... APR 16. .. JUN 11. .. AUG 15. .. HARD- HARD- NESS NESS NONCARB CALCIUM TOTAL WH WAT DIS- (MG/L TOT FLD SOLVED AS MG/L AS (MG/L CAC03) CAC03 MAGNE- SIUM, SODIUM, DIS- DIS- SOLVED SOLVED (MG/L (MG/L AS CA) AS MG) AS NA) 83 0 22 6.7 11 110 0 30 8.9 17 110 17 29 8.1 15 SODIUM AD- SORP- TION RATIO ALKA- POTAS- LINITY SIUM, HAT WH DIS- TOT FBT SULFIDB SOLVED FIELD TOTAL (MG/L MG/L AS (MG/L AS K) 0.5 2.1 0.7 2.1 0.6 2.3 CAC03 68 84 98 110 98 98 CHLO- SULFATB RIDE, DIS- DIS- SOLVED SOLVED (MG/L <0.5 13 <0.5 19 21 (MG/L AS S) AS SO4) AS CL) 10 16 15 DATE OCT 1989 04.. . NOV 29... FBB 1990 20... APR 16.. . JUN 11... AUG 15... FLUO- RIDB, DIS- SOLVED (MG/L AS F) 0.10 -- -- 0.10 -- 0.10 SILICA, DIS- SOLVED (MG/L AS SI 02) 25 — — 30 -- 27 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 131 -- -- 184 -- 171 RESIDUE SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, SOLVED DBG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL PER PBNDBD (MG/L (MG/L (MG/L (MG/L (MG/L DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) 142 17 17.4 54 13 7 50 2 16 1.08 1.24 1.04 0.75 0.09 0.86 0.02 0.06 0.06 0.05 0.01 0.04 1.1 1.3 1.1 0.80 0.10 0.90 0.05 0.06 0.16 0.08 0.02 0.05 0.25 0.14 0.54 1.8 0.68 0.75 non-ideal count RIO GRANDE DE ARBCIBO BASIN 50025000 RIO GRANDE DE ARBCIBO NEAR UTUADO, PR—Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 71 DATE OCT 1989 04.. . NOV 29... FEB 1990 20.. . APR 16... JUN 11... AUG 15... DATE OCT 1989 04... NOV 29.. . FEB 1990 20... APR 16.. . JUN 11... AUG 15... NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.30 0.20 0.70 1.9 0.70 0.80 IRON, TOTAL RECOV- ERABLE (UG/L AS FE) 3400 -- -- 3700 -- -- NITRO- GEN, TOTAL (MG/L AS N) 1.4 1.5 1.8 2.7 0.80 1.7 LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) 5 — -- 2 -- — NITRO- GEN, TOTAL (MG/L AS NO3) 6.2 6.6 8.0 12 3.5 7.5 MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) 120 -- -- 150 -- -- PHOS- PHORUS ARSENIC TOTAL TOTAL (MG/L (UG/L AS P) AS AS) 0.07 <1 0.10 0.15 0.15 <1 0.25 0.12 MERCURY TOTAL SBLB- RECOV- NIUM, BRABLB TOTAL (UG/L (UG/L AS HG) AS SB) <0.10 <1 __ — <0.10 <1 __ — BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 — — <100 — — — SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) <1 — -- <1 — — BORON, TOTAL RECOV- ERABLE (UG/L AS B) <10 -- -- 20 -.- — — ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) 20 -- -- 20 -- -- CHRO- CADHIDM MIUM, TOTAL TOTAL RECOV- RECOV- ERABLE ERABLB (UG/L (UG/L AS CD) AS CR) <1 1 __ — <1 3 — .. CYANIDE TOTAL PHENOLS (MG/L TOTAL AS CN) (UG/L) <0.010 3 — __ <0.010 2 __ — COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) 10 -- — 20 — "" METHY- LBNE BLUB ACTIVE SUB- STANCE (MG/L) 0.04 — — 0.02 -- — 72 RIO GRANDB DB ARBCIBO BASIN 50025155 RIO SALIENTB AT COABEY NEAR JAYUYA, PR LOCATION.--Lat 18°12'48", long 66°33'49", Hydrologic Dnit 21010002, 2.0 mi (3.2 km) southeast of Jayuya, 1.4 mi (2.2 km) northeast of Hacienda Gripifias. DRAINAGE AREA.--9.25 mi" (23.96 kma ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--October 1989 to September 1990. GAGE.--Water-stage recorder. Elevation of gage is 1,706 ft (520 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. Gage-height and precipitation satellite telemetry at station. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 275 ft'/s ( 7.79 m'/s) and maximum (*): Discharge (ft'/s) (m'/s) Gage height (ft) (m) Date Time Sept. 3 1600 *457 12.9 *7.58 2.310 Minimum daily discharge, 2.4 ft'/s (0.068 m3/s), July 23. Date Sept. 9 Time 1800 Discharge (ftVs) (m'/s) 283 8.01 DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES OCT NOV FEB APR MAY JUN Gage height (ft) (m) 7.01 2.137 SEP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC -FT CFSM IN. e38 e35 e40 e35 e32 28 25 28 36 32 28 29 30 25 26 26 26 25 25 27 26 25 35 24 24 24 24 25 25 26 26 880 28.4 40 24 1750 3.07 3.54 25 26 25 24 24 24 24 25 23 23 22 22 22 22 22 21 20 20 20 19 19 18 17 16 15 16 15 14 13 13 --- 609 20.3 26 13 1210 2.19 2.45 13 12 13 13 12 11 11 11 11 11 11 10 10 10 9.9 9.6 9.7 9.5 9.6 9.4 8.9 9.0 8.6 8.6 8.8 8.5 8.4 7.9 8.4 8.8 8.1 310.7 10.0 13 7.9 616 1.08 1.25 8.7 8. 9 9.0 9.0 9.0 8.7 8.7 8.4 8.0 8.0 8.0 7.9 7.3 7.3 6.6 6.6 6.6 6.3 6.5 6.6 6.2 6.0 6.0 6.3 6.1 6.2 6.3 e6.2 e6.0 e5.9 e5.7 223.0 7.19 9.0 5.7 442 .78 .90 e5.6 e5.4 e5.3 e5.2 e5.1 e5.0 e6.0 e6.6 e5.6 e6.6 e5.2 e5.0 e5.6 e7.5 e9.5 e7.0 e6.0 e5.8 e5.8 e5.5 e6.0 e6.5 e6.2 e5.6 e6.2 e7.0 e5.8 e5.3 __. ___ --- 167.9 6.00 9.5 5.0 333 .65 .68 e5.3 e5.1 e5.0 e4.7 e4.6 e4.6 e4.5 e5.1 e6.2 e6. 6 e6.4 e7.5 e25 e35 e25 e20 15 13 11 10 10 9.4 8.6 8.3 7.9 8.1 7.8 7.1 6.9 6.6 6.5 306.8 9.90 35 4.5 609 1.07 1.23 6.1 6.0 5.6 5.3 4.5 4 .3 4.3 4.3 4.2 3.7 3.7 3.6 4.2 6.1 5.8 4.7 5.4 19 16 18 9.8 7.7 6.8 5.8 7.0 12 8.0 6.9 6.1 5.5 --- 210.4 7.01 19 3.6 417 .76 .85 5.6 5.9 5.2 5.2 5.6 5.2 4.7 5.1 5.9 10 19 7.4 5.9 5.9 5.7 5.0 4.7 4.7 4.3 4.0 3.9 3.6 3.4 3.3 3.2 3.0 3.2 3.8 6.1 3.8 3.4 165.7 5.35 19 3.0 329 .58 .67 4.0 4.4 4.0 4.1 16 12 6.5 4.8 4.0 4.0 3.7 3.4 3.4 19 102 25 13 11 9.5 8.3 7.4 6.7 7.1 10 9.2 7.1 6.2 5.5 5.2 4.7 --- 331.2 11.0 102 3.4 657 1.19 1.33 4.6 4.5 4.0 5.2 5.6 4.7 15 19 7.3 5.8 4.7 4.6 4.1 6.7 6.6 7.9 3.9 6.7 7.4 4.9 3.4 2.8 2.4 4.6 5.3 8.3 21 16 7.0 4.8 3.6 212.4 6.85 21 2.4 421 .74 .85 3.1 4.5 4.8 3.2 22 12 6.5 4.7 4.0 4.8 6.5 3.7 30 16 8.1 5.6 4.3 3.9 3.5 2.9 2.7 30 37 25 11 8.0 6.4 37 53 29 36 429.2 13.8 53 2.7 851 1.50 1.73 31 37 74 75 34 49 54 41 68 81 45 36 37 32 43 37 25 20 38 56 53 30 51 51 61 64 37 28 24 45 --- 1357 45.2 81 20 2690 4.89 5.46 WTR YR 1990 TOTAL 5203.3 MEAN 14.3 MAX 102 MIN 2.4 AC-FT 10320 CFSM 1.54 IN. 20.93 e Estimated RIO GRANDE DB ARECIBO BASIN 73 50025155 RIO SALIENTS AT COABEY NEAR JAYUYA, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--OCTOBER 1989 TO SEPTEMBER 1990 STREAMFLOW, DATE TIME INSTANTANEOUS (CFS) OCT. 10 1109 NOV. 13 1075 05 1323 08 1124 12 0959 DEC. JAN. FEB. MAR. 12 1003 36.0 19.5 12.6 8.6 4.5 18.2 SPECIFIC CON- TEMPERA- DUCTANCE TURE (UMHOS) (DBG C) 146 166 127 122 133 130 23.0 25.0 26.0 20.0 20.5 19.0 DATE TIME APR. 09 0938 MAY 14 0850 JUNE 04 0849 JULY 17 1231 AUG. 13 0940 SEPT 10 1019 STREAMFLOW, INSTANTANEOUS (CFS) 4.5 6.1 3.8 3.5 3.3 106 SPECIFIC CON- TEMPERA- DUCTANCE TURE (UMHOS) (DBG C) 132 143 145 124 150 100 20.0 20.0 22.0 22.0 21.0 21.0 74 RIO QRANDB DB ARBCIBO BASIN 50026050 RIO CAONILLAS ABOVE LAGO CAONILLAS NEAR JAYUYA, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°13'26", long 66°38'22", 300 ft (91 m) off Highway 531, 700 ft (213 m) upstream from Caonillas, 3.3 ml (5.3 km) northwest of Jayuya plaza. DRAINAGE AREA.--40.4 mi 1 (104.6 km1 ). PERIOD OF RECORD.--Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 Lago DATE OCT 1989 25. .. DEC 18... FBB 1990 15... APR 27... JUN 11... ADO 14... TIME 1000 1030 1400 1150 0830 1015 DIS- CHARGE, INST. CUBIC FEET PER SECOND 285 32 32 23 9.5 63 SPE- CIFIC CON- DUCT- ANCE (US/CM) 155 203 201 225 242 165 PH (STAND- ARD UNITS) 6.90 8.00 7.90 8.00 8.00 7.80 TEMPER- ATURE WATER (DEG C) 21.5 21.5 22.0 26.0 26.5 25.0 TUR- BID- ITY (NTU) 8.0 0.40 1.0 0.40 1.0 87 OXYGEN, DIS- SOLVED (MG/L) 9.4 8.6 6.5 7.5 7.6 8.5 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 109 98 75 94 95 104 OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 22 19 16 10 18 30 COLI- FORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) 2400 K100 390 K45 K60 27000 STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) 440 K40 230 K64 K45 31000 DATE OCT 1989 25. .. DEC 18. .. FBB 1990 15... APR 27... JUN 11. . . AUG 14... HARD- HARD- NESS NESS NONCARB CALCIUM TOTAL WH WAT DIS- (MG/L TOT FLD SOLVED AS MG/L AS (MG/L CAC03) CAC03 MAGNE- SIUM, SODIUM, DIS- DIS- SOLVED SOLVED (MG/L (MG/L AS CA) AS MG) AS NA) SODIUM AD- SORP- TION RATIO 79 0 21 6.5 12 ALKA- POTAS- LINITY SIUM, WAT WH DIS- SOLVED AS K) 55 0 14 4.8 9.1 0.5 1.7 0.6 1.4 58 9 15 4.9 8.7 0.5 2.6 TOT FBT SULFIDB FIELD TOTAL (MG/L MG/L AS (MG/L CAC03 44 74 67 74 89 49 CHLO- SULFATE RIDE, DIS- DIS- SOLVED SOLVED (MG/L <0.5 12 <0.5 13 12 (MG/L AS S) AS SO4) AS CL) 8.8 10 11 SOLIDS, RESIDUE DATE OCT 1989 25.. . DEC 18... FEB 1990 15.. . APR 27... JUN 11... AUG 14... FLUO- RIDB, DIS- SOLVED (MG/L AS F) 0.10 -- -- 0.10 -- 0.10 SILICA, DIS- SOLVED (MG/L AS SI02) 23 -- -- 20 — 17 SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 100 __ -- 130 __ 101 SOLIDS, DIS- SOLVED (TONS PER DAY) 76.9 __ — 8.1 — 17.5 TOTAL AT 105 DBG. C, SUS- PENDED (MG/L) 4 <1 3 15 <1 66 NITRO- GEN, NITRATE TOTAL (MG/L AS N) 1.39 — 0.79 0.29 __ 0.65 NITRO- GEN, NITRITE TOTAL (MG/L AS N) 0.01 <0.01 0.01 0.01 <0.01 0.05 NITRO- GEN, N02+N03 TOTAL (MG/L AS N) 1.40 0.60 0.80 0.30 <0.10 0.70 NITRO- GEN, AMMONIA TOTAL (MG/L AS N) 0.03 0.02 0.02 <0.01 0.02 0.07 NITRO- GEN, ORGANIC TOTAL (MG/L AS N) 0.37 — 0.48 — 0.68 0.83 K = non-ideal count RIO GRANDE DE ARECIBO BASIN 50026050 RIO CACHILLAS ABOVE LAGO CAONILLAS NEAR JAYUYA, PR—Continued WATER-QUALITY DATA, HATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 75 DATE OCT 1989 25.. . DEC 18... FEB 1990 15... APR 27... OUN 11... AUG 14... DATE OCT 1989 25... DEC 18... FEB 1990 15.. . APR 27... OUN 11... AUG 14... NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.40 <0.20 0.50 0.60 0.70 0.90 IRON, TOTAL RECOV- ERABLE (UG/L AS FE) NITRO- GEN, TOTAL (MG/L AS N) 1.8 — 1.3 0.90 — 1.6 LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) NITRO- GEN, TOTAL (MG/L AS N03) 8.0 — 5.8 4.0 — 7.1 MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) PHOS- PHORUS TOTAL (MG/L AS P) 0.05 0.05 0.07 0.05 0.07 0.19 MERCURY TOTAL RECOV- ERABLE (UG/L AS HG) ARSENIC TOTAL (UG/L AS AS) <1 — — <1 — — SELE- NIUM, TOTAL (UG/L AS SB) BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 — -- <100 __ — SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) BORON, TOTAL RECOV- ERABLE (UG/L AS B) <10 -- — <20 -- -- ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 — — <1 — — CYANIDE TOTAL (MG/L AS CN) CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) <1 -- — <1 — -- PHENOLS TOTAL (UG/L) COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) 10 — — 10 -_ — METHY- LBNB BLUB ACTIVE SUB- STANCE (MG/L) 850 80 60 10 0.40 <0.10 10 <0.010 10 <0.010 0.02 0.02 76 RIO GRANDE DE ARECIBO BASIN 50027250 RIO GRANDE DE ARECIBO BELOW LAGO DOS BOCAS NEAR FLORIDA, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°20'50", long 66°40'02", at pedestrian bridge, 0.7 mi (1.1 km) downstream from Lago Dos Bocas and 6.6 mi (10.6 km) west of Florida plaza. DRAINAGE AREA.--169 mi» (436 km») does not include 6.0 mi 2 (15.6 km 2 ) above Lago Garzas. PERIOD OF RECORD.--Water years 1970-71, 1974 to current year. DATE OCT 1989 20. .. NOV 29. . . FEB 1990 20. . . APR 03. . . JUN 21. . . ADG 22. . . TIME 1145 0900 0845 1030 0830 0730 HARD- NESS TOTAL (MG/L DIS- CHARGE, INST. CUBIC FEET PER SECOND 1660 e!680 22 1060 17 , 19 HARD- NESS NONCARB WH WAT TOT FLD SPE- CIFIC CON- DUCT- ANCE (US/CM) 172 192 208 222 223 229 CALCIUM DIS- SOLVED PH (STAND- ARD UNITS) 7.20 7.00 7.50 7.20 7.50 7.40 MAGNE- SIUM, DIS- SOLVED TEMPER- ATURE WATER (DEC C) 24.5 24 .5 23 .0 24.5 26.5 27.5 SODIUM, DIS- SOLVED TUR- BID- ITY (NTU) 130 20 1.0 1.7 1.6 1.5 SODIUM AD- SORP- TION OXYGEN, DIS- SOLVED (MG/L) 6.6 5.8 8.2 2.7 4.9 4.2 POTAS- SIUM, DIS- SOLVED OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 78 69 94 32 60 52 ALKA- LINITY WAT WH TOT FET FIELD OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 30 14 13 16 18 10 SULFIDE TOTAL COLI- FORM, FECAL, 0.7 DM-MF (COLS./ 100 ML) 3700 K60 K30 K10 K60 K50 SULFATE DIS- SOLVED STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) 3400 K230 KB 4 K10 130 K42 CHLO- RIDE, DIS- SOLVED OCT 1989 20. . . NOV 29. . . FEB 1990 20. . . APR 03. .. JUN 21. .. AUG 22. . . AS MG/L AS (MG/L (MG/L (MG/L (MG/L MG/L AS (MG/L (MG/L CACO3) CACO3 67 84 AS CA) AS MG) AS NA) AS K) CAC03 5.4 9.0 0.5 2.5 23 25 6.5 11 6.8 11 0.5 2.1 0.5 2.3 59 64 79 80 82 86 <0.5 10 (MG/L AS S) AS S04) AS CL) 8.0 <0.5 13 12 8.9 10 SOLIDS, DATE OCT 1989 20. . . NOV 29. . . FEB 1990 20. .. APR 03. .. JUN 21.. . AUG 22. .. FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.10 -- -- <0.10 -- 0.10 SILICA, DIS- SOLVED (MG/L AS SIO2) 20 -- -- 22 -- 22 SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 108 -- -- 138 -- 138 SOLIDS, DIS- SOLVED (TONS PER DAY) 486 -- -- 393 -_ 7 .1 TOTAL AT 105 DEC. C, SUS- PENDED (MG/L) 122 24 18 3 30 1 NITRO- GEN, NITRATE TOTAL (MG/L AS N) 1.03 0.99 0.38 0.39 0.06 0.18 NITRO- GEN, NITRITE TOTAL (MG/L AS N) 0.07 0.01 0.02 0.01 0.04 0.02 NITRO- GEN, NO2+NO3 TOTAL (MG/L AS N) 1.10 1.00 0.40 0.40 0.10 0.20 NITRO- GEN, AMMONIA TOTAL (MG/L AS N) 0.05 0.11 0.03 0.04 0.11 0.13 NITRO- GEN, ORGANIC TOTAL (MG/L AS N) 0.25 0. 69 0.27 0.16 0.29 0.27 K = non-ideal count e = estimate RIO GRANDB DB ARBCIBO BASIN 50027250 RIO GRANDB DB ARBCIBO BELOW LAGO DOS BOCAS NEAR FLORIDA, PR—Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 77 DATE OCT 1989 20... NOV 29... FBB 1990 20.. . APR 03... JUN 21.. . AUG 22.. . DATE OCT 1989 20.. . NOV 29... FBB 1990 20... APR 03.. . JUN 21... AUG 22.. . NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.30 0.80 0.30 0.20 0.40 0.40 IRON, TOTAL RECOV- ERABLE (UG/L AS FB) 9300 __ -- 270 -- — NITRO- GEN, TOTAL (MG/L AS N) 1.4 1.8 0.70 0.60 0.50 0.60 LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) 5 — — 3 — — NITRO- GEN, TOTAL (MG/L AS N03) 6.2 8.0 3.1 2.7 2.2 2.7 MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) 180 __ __ 200 _- — PHOS- PHORUS TOTAL (MG/L AS P) 0.12 0.07 0.02 0.02 0.04 0.03 MERCURY TOTAL RECOV- ERABLE (UG/L AS HG) 0.30 __ -- 0.10 — — BARIUM, TOTAL ARSENIC RBCOV- TOTAL ERABLE (UG/L (UG/L AS AS) AS BA) <1 <100 __ __ <1 <100 __ -- -- SILVER, SBLE- TOTAL NIUM, RBCOV- TOTAL ERABLE (UG/L (UG/L AS SB) AS AG) <1 <1 __ __ <1 <1 __ — BORON, TOTAL RECOV- ERABLE (UG/L AS B) <10 __ -- 40 _- -- ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) 30 __ __ <10 __ — CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 — — <1 — — — CYANIDE TOTAL (MG/L AS CN) <0.010 — — <0.010 — — CHRO- MIUM, COPPER, TOTAL TOTAL RBCOV- RECOV- ERABLE ERABLE (UG/L (UG/L AS CR) AS CO) 5 30 __ __ 2 10 __ -- -~ MBTHY- LENE BLUB ACTIVE PHENOLS SUB- TOTAL STANCE (UG/L) (MG/L) <1 <0.01 __ __ <1 0.04 __ — 78 RIO GRANDE DE ARECIBO BASIN 50027750 RIO GRANDE DE ARECIBO ABOVE ARECIBO, PR LOCATION.--Lat 18°25'22", long 66°41'58" / Hydrologic Unit 21010002, 0.5 mi (0.8 km) upstream from Rio Tanama, 3.6 mi (5.8 km) south of Arecibo and 4.9 mi (7.9 km) above mouth, and 10.4 mi (16.7 km) downstream from Lago Dos Bocas. DRAINAGE AREA.--200 mi j (520 km'), approximately, of which an undetermined amount does not contribute directly to surface runoff. WATER-DISCHARGE RECORDS PERIOD OF RECORD.—April 1982 to current year. GAGE.--Water-stage recorder. Elevation of gage is 30 ft (9 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. Flow regulated by Lago Dos Bocas Dam 10.4 mi (16.7 km) upstream from gage. Gage-height and precipitation satellite telemetry at station. AVERAGE DISCHARGE.--8 years (1983-90), 438 ft3 /s (12.40 m3 /s), 29.74 in/yr (755 mm/yr), 317,300 acre-ft/yr (391 hm'/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 45,800 ft'/s (1,300 m3/s). May 18, 1985, gage height, 18.22 ft (5.553 m), from floodmark, from rating curve extended above 2,400 ft3 /s (68.0 mVs) on basis of slope-area measurement of peak flow; minimum discharge, 30 ft3 /s (0.850 m3 /s). Mar. 30, 1986. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 4,300 ft3 /s (122 m3 /s) and maximum (*): Time Discharge (ft3 /s) (m3/s) Gage height (ft) (m) Date Discharge (ft3 /s) (m3/s) Date Time Oct. 23 0030 *3,300 93.4 *8.28 2.524 Minimum daily discharge, 38 ft3/s (1.076 m'/s), June 3, Sept. 1. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES Gage height (ft) (m) NOV DEC JAN FEB MAY JUN AUG SEP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC- FT CFSM IN. CAL YR WTR YR 1300 1270 1800 1410 1690 1590 917 873 816 698 854 783 894 547 210 441 467 1550 756 1010 1030 1660 1970 1710 1430 830 825 638 840 1400 1040 33249 1073 1970 210 65950 7.66 8.83 1989 1990 1270 1160 1210 161 104 e93 812 1060 761 746 470 200 204 740 860 720 826 629 763 439 732 704 267 335 328 e240 e!51 e652 784 814 18235 608 1270 93 36170 4.34 4.85 TOTAL 142936 TOTAL 121424 348 e91 e!45 773 754 413 611 937 183 e!90 6277 e238 e352 450 190 576 258 578 231 e!43 e!28 e58 e57 e81 e65 e351 e246 e62 e!41 e72 e58 9057 292 937 57 17960 2.09 2.41 MEAN MEAN e60 e58 e625 eSOO e!72 e278 6229 e89 6283 6354 6426 e568 el51 6195 elOO 6543 e!46 e52 e50 642 e!73 e50 e49 e47 647 e44 e43 e!50 6166 6267 e58 6015 194 625 42 11930 1.39 1.60 392 MAX 333 MAX e55 e49 e75 e!70 e!06 e57 e50 193 85 53 53 152 81 381 80 54 57 130 463 125 199 268 72 54 126 112 54 47 ___ ___ --- 3401 121 463 47 6750 .87 .90 1970 MIN 1970 MIN 53 54 55 238 64 47 50 70 232 572 258 264 275 309 822 479 151 77 161 831 196 70 78 492 119 63 137 126 145 226 352 7066 228 831 47 14020 1.63 1.88 50 AC- FT 38 AC-FT 416 307 652 123 173 197 401 217 69 98 171 68 139 70 239 183 220 193 453 488 106 78 291 480 420 430 540 533 508 557 --- 8820 294 652 68 17490 2.10 2.34 283500 240800 192 160 302 413 84 275 575 316 511 272 424 177 59 544 552 98 506 537 120 56 55 270 73 55 86 49 88 109 191 259 91 7499 242 575 49 14870 1.73 1.99 CFSM 2.80 CFSM 2.38 64 43 38 81 106 414 92 373 93 217 320 417 454 328 148 79 63 401 393 312 107 65 68 53 134 312 369 100 137 82 --- 5863 195 454 38 11630 1.40 1.56 IN. 37. IN. 32, 50 47 49 52 82 68 46 45 43 235 213 73 326 137 54 394 254 307 421 531 113 57 51 58 52 389 248 60 49 393 100 4997 161 531 43 9910 1.15 1.33 ,98 ,26 53 48 43 44 41 389 94 52 133 44 42 44 304 338 188 49 79 190 44 147 164 236 211 448 227 66 428 453 94 48 42 4783 154 453 41 9490 1.10 1.27 38 40 72 323 502 621 369 95 353 792 748 526 538 460 355 128 464 497 449 282 441 369 363 433 609 530 593 562 615 272 --- 12439 415 792 38 24670 2.96 3.31 Estimated RIO GRANDB DE ARECIBO BASIN 50027750 RIO GRANDE DE ARECIBO ABOVE ARECIBO, PR—Continued WATER QUALITY RECORDS PERIOD OP RECORD.--WATER YEARS APRIL 1982 TO CURRENT YEAR STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEC C) 79 OCT. 16 0927 NOV. 03 0846 DEC. 15 0950 12 1006 16 0843 JAN. FEB. MAR. 08 0827 87.3 164 118 116 54 44.4 80 198 212 206 255 255 26.0 26.0 26.0 23.0 26.0 24.0 DATE TIME APR. 05 0836 MAY 10 1040 JUNE 08 0908 JULY 10 0956 AUG. 17 0803 SEPT 12 0851 STREAMFLOW, INSTANTANEOUS (CFS) 122.5 140 59.4 71 86.9 155 SPECIFIC CON- TEMPERA- DUCTANCE TURE (UMHOS) (DBG C) 240 240 243 230 260 210 22.0 25.0 24.0 24.0 23.0 25.0 80 RIO GRANDB DB ARECIBO BASIN 50028000 RIO TANAMA NEAR UTDADO, PR LOCATION.--Lat 18°18'02" / long 66°46'58", Hydrologic Unit 21010001, on downstream side of left abutment of bridge on Highway 111, 1.2 mi (1.9 km) upstream from natural tunnel, 1.5 mi (2.4 km) northeast of Angeles, and 5.8 mi (9.3 km) northwest of Utuado. DRAINAGE AREA.--18.4 mi' (47.7 km'). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--June 1944 to June 1958 (daily stage and two to four measurements per month by Puerto Rico Water Resources Authority), November 1959 to current year. GAGE.--Water-stage recorder and crest-stage gage. Datum of gage is 938.32 ft (286.00 m) above mean sea level. Datum of gage was lowered 3.00 ft (0.914 m) on Oct. 1978. Prior to Nov. 17, 1966, non-recording gage and Nov. 17, 1966 to Sept. 30, 1978 recording gage, both at present site. REMARKS.--Records fair except those for estimated daily discharges, which are poor. AVERAGE DISCHARGE.--30 years (1961-90), 48.0 ft3 /s (1.359 m3 /s), 35.42 in/yr (900 mm/yr), 34,780 acre-ft/yr (42.9 hmVyr); median of yearly mean discharges, 48 ft3 /s (1.36 m3 /s) , 34,800 acre-ft/yr (43 hm'/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 12,190 ftVs (345 m'/s), May 18, 1985, gage height, 17.45 ft (5.319 m) new datum in use, from floodmark and recorder, from rating curve extended above 500 ft'/s (14.2 m3 /s) on basis of slope-area measurement of peak flow; minimum discharge, 6.6 ft'/s (0.187 mVs) , June 12, 1977. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 3,000 ft3 /s (85.0 m3 /s) and maximum (*): Date Oct. Oct. Oct. 17 19 22 Time 1730 1600 1645 Discharge (ftVs) (mVs) 3, 3, 4, 510 620 190 99.4 102 119 Gage height (ft) (m) 12. 12. 13. .36 .50 .20 3. 3. 4. .767 .810 .023 Date Aug. Sept. Sept. 9 9 20 Time 1645 1445 1645 (ft 3 *4, 3, 3, Discharge /s) (m3/s) 470 370 040 126 95 86, .4 .1 Gage height (ft) (m) *13. 12. 11. .52 ,18 .73 4. 3. 3. .121 .712 ,575 Minimum discharge, 10 ftVs (0.283 mVs), Apr. 10,13,14. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES DEC JUN JUL 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC- FT CFSM IN. CAL YR WTR YR elOO e300 e290 e310 e350 e200 e!20 e!60 e!30 el!5 112 131 103 91 102 202 474 163 338 170 272 423 204 169 e!55 el48 el30 141 196 126 112 6037 195 474 91 11970 10.6 12.21 1989 1990 102 95 90 85 84 82 78 75 72 91 70 67 64 62 60 57 139 71 60 59 58 57 54 50 49 47 46 44 44 43 --- 2055 68.5 139 43 4080 3.72 4.15 TOTAL 19019 TOTAL 18625 43 42 41 40 39 38 38 37 36 35 35 34 33 32 32 36 33 31 31 31 29 29 28 28 27 27 26 45 36 28 86 1106 35.7 86 26 2190 1.94 2.24 MEAN MEAN 44 42 36 31 30 29 28 29 28 27 27 27 26 26 25 23 24 23 22 23 22 22 22 22 23 23 23 22 21 20 19 809 26.1 44 19 1600 1.42 1.64 52.1 MAX 51.0 MAX 19 19 18 18 18 17 19 23 20 21 21 20 18 44 22 20 19 19 24 25 18 22 18 17 17 18 17 17 --- ___ --- 568 20.3 44 17 1130 1.10 1.15 474 MIN 474 MIN 18 17 17 15 14 14 14 14 26 20 21 62 43 35 23 29 33 20 18 19 18 16 16 17 14 14 13 13 13 12 12 630 20.3 62 12 1250 1.10 1.27 12 AC -FT 11 AC-FT 12 12 12 12 11 55 24 14 12 12 11 11 11 12 13 21 16 148 72 75 e35 e23 e22 e21 e20 27 28 21 20 19 --- 802 26.7 148 11 1590 1.45 1.62 37720 36940 19 19 18 18 17 17 76 211 109 51 37 33 29 29 26 25 24 23 23 26 26 25 26 24 24 23 22 21 21 25 23 1090 35.2 211 17 2160 1.91 2.20 CFSM 2.83 CFSM 2.77 40 26 20 23 43 57 22 18 25 31 84 35 21 28 184 49 34 31 27 25 23 22 27 26 22 21 21 20 19 19 1043 34.8 184 18 2070 1.89 2.11 IN. 38.45 IN. 37.65 18 18 17 28 53 32 35 47 35 23 21 20 20 22 31 27 22 22 20 19 18 17 17 22 33 26 22 20 19 19 21 764 24.6 53 17 1520 1.34 1.54 20 23 23 19 22 25 19 24 265 e64 e55 e46 e67 52 29 24 22 34 23 20 20 29 23 76 37 25 21 39 28 21 32 1227 39.6 265 19 2430 2.15 2.48 35 33 102 117 103 120 98 62 240 57 59 44 46 58 38 29 40 31 133 251 100 62 86 130 101 e61 e44 39 34 141 --- 2494 83.1 251 29 4950 4.52 5.04 e Estimated RIO GRANDE DE ARECIBO BASIN 8 1 50028000 RIO TANAMA NEAR UTUADO, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORD.--Water years 1958 to current year. PERIOD OF DAILY RECORD.-- SUSPENDED SEDIMENT DISCHARGE: January 1968 to current year. INSTRUMENTATION.--US D-49 SEDIMENT SAMPLER SINCE OCTOBER 1968. AUTOMATIC SEDIMENT SAMPLER SINCE 1990 REMARKS.--Sediment samples were collected by a local observer on a weekly basis and during high flow events. Estimates for period of missing daily record were made from a sediment transport curve developed from a period of record over 5 years. EXTREMES FOR PERIOD OF DAILY RECORD.-- SEDIMENT CONCENTRATIONS: Maximum daily mean, 20,400 mg/L November 27, 1968; minimum daily mean, 0 mg/L during water year 1985. SEDIMENT LOADS: Maximum daily, 167,000 tons (152,000 tonnes) May 18, 1985, minimum daily, 0.0 ton (0.0 tonne) several days during many years. EXTREMES FOR CURRENT YEAR.-- SEDIMENT CONCENTRATIONS: Maximum daily mean, 2,310 mg/L October 17, 1989; minimum daily mean, 3.0 mg/L several days. SEDIMENT LOADS: Maximum daily, 11,400 tone (10,400 tonnes) October 17, 1989; minimum daily, 0.14 ton (0.13 tonne) several days. WATER-QUALITY DATA, WATER YEARS OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 10. . . DEC 07. . . FEB 1990 05. .. MAY 01. . . JUN 14. .. ADG 20... TIME 1215 1115 1045 0845 1045 1130 DIS- CHARGE, INST. CUBIC FEET PER SECOND 129 38 17 19 21 22 SPE- CIFIC CON- DUCT- ANCE (US /CM) 140 151 165 173 168 158 PH (STAND- ARD UNITS) 7.00 6.80 8.00 7.70 6.70 8.20 TEMPER- ATURE WATER (DEG C) 23.0 21.0 20.0 21.0 25.0 26.0 TUR- BID- ITY (NTU) 8.0 2.0 1.4 2.0 10 7.3 OXYGEN, DIS- SOLVED (MG/L) 9.0 9.2 8.7 8.8 7.8 8.0 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 107 105 98 101 95 99 OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 26 15 11 11 11 13 COLI- FORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) 240 K82 K40 K53 360 80 STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) 510 210 K130 210 750 210 DATE OCT 1989 10. .. DEC 07. . . FEB 1990 05. . . MAY 01. . . JUN 14. .. AUG 20. .. HARD- NESS TOTAL (MG/L AS HARD- NESS NONCARB CALCIUM WH WAT TOT FLD CAC03) CAC03 DIS- SOLVED MG/L AS (MG/L 52 4 13 64 9 15 62 6 15 MAGNE- SIUM, SODIUM, DIS- DIS- SOLVED SOLVED (MG/L (MG/L AS CA) AS MG) AS NA) SODIUM AD- SORP- TION RATIO 6.4 11 ALKA- POTAS- LINITY SIUM, WAT WH DIS- TOT FET SULFIDE SOLVED FIELD TOTAL (MG/L MG/L AS (MG/L AS K) 4.8 7.6 0.5 1.9 0.6 2.0 5.9 8.6 0.5 2.4 CAC03 44 56 57 61 56 56 CHLO- SULFATE RIDE, DIS- DIS- SOLVED SOLVED (MG/L cO.S 11 12 (MG/L AS S) AS S04) AS CL) 7.3 <0.5 1.5 39 8.9 non-ideal count 82 RIO GRANDE DE ARBCIBO BASIN 50028000 RIO TANAMA NEAR DTDADO, PR--Continued WATER-QUALITY DATA, WATER YEARS OCTOBER 1989 TO SEPTEMBER 1990 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- DATE OCT 1989 10... DEC 07... FEB 1990 05... MAY 01.. . JUN 14.. . AUG 20... DATE OCT 1989 10... DEC 07.. . FEB 1990 05... MAY 01.. . JUN 14... AUG 20.. . DATE OCT 1989 10... DEC 07.. . FBB 1990 05.. . MAY 01... JUN 14... AUG 20.. . RIDE, DIS- SOLVED (MG/L AS F) 0.10 -- -- •cO.10 -- <0.10 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) <0.20 <0.20 <0.20 0.20 0.30 0.30 IRON, TOTAL RECOV- ERABLE (UG/L AS FB) 750 -- -- 150 -- -- DIS- SOLVED (MG/L AS SI02) 22 -- -- 26 -- 24 NITRO- GEN, TOTAL (MG/L AS N) — -- -- 0.70 1.1 0.90 LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) 1 -- __ 3 — -- CONSTI- TUENTS, DIS- SOLVED (MG/L) 94 -- -- 136 -- 110 NITRO- GEN, TOTAL (MG/L AS N03) -- -- -- 3.1 4.9 4.0 MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) 50 -- __ 20 -- -- DIS- SOLVED (TONS PER DAY) 32.8 -- -- 8.36 — 6.53 PHOS- PHORUS TOTAL (MG/L AS P) 0.03 0.03 0.02 0.01 0.13 0.02 MERCURY TOTAL RECOV- ERABLE (UG/L AS HG) <0.10 -- __ <0.10 — -- AT 105 DBG. C, SUS- PENDED (MG/L) 5 1 9 21 3 6 ARSENIC TOTAL (UG/L AS AS) <1 __ __ <1 __ -- SELE- NIUM, TOTAL (UG/L AS SB) <1 __ __ <1 __ __ GEN, NITRATE TOTAL (MG/L AS N) — -- -- 0.49 0.79 0.59 BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 — __ <100 __ -- SILVBR, TOTAL RECOV- ERABLE (UG/L AS AG) <1 __ __ <1 __ -- GEN, NITRITE TOTAL (MG/L AS N) <0.01 <0.01 <0.01 0.01 <0.01 <0.01 BORON, TOTAL RECOV- ERABLE (UG/L AS B) 30 __ __ <10 __ -- ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) <10 __ __ <10 __ -- GEN, N02+N03 TOTAL (MG/L AS N) 1.10 0.90 0.70 0.50 0.80 0.60 CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 __ __ <1 -- -- CYANIDE TOTAL (MG/L AS CN) <0.010 __ __ <0.010 __ -- GEN, AMMONIA TOTAL (MG/L AS N) 0.02 0.01 0.02 <0.01 0.02 0.06 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) 1 __ -- <1 -- -- PHENOLS TOTAL (UG/L) 1 -_ __ 1 __ -- GEN, ORGANIC TOTAL (MG/L AS N) -- -- -- 0.19 0.28 0.24 COPPER, TOTAL RECOV- ERABLE (UG/L AS CD) 10 __ __ 10 — -- METHY- LENE BLUB ACTIVE SUB- STANCE (MG/L) 0.03 __ __ 0.04 __ __ RIO GRANDE DE ARECIBO BASIN 50028000 RIO TANAMA NEAR UTUADO, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY) , WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 83 DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN DISCHARGE (CFS) elOO e300 e290 e310 e350 e200 e!20 e!60 e!30 el!5 112 131 103 91 102 202 474 163 338 170 272 423 204 169 e!55 e!48 e!30 141 196 126 112 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) OCTOBER elOO e700 elOlO e970 e!240 e700 e350 e300 e350 e275 30 276 78 13 183 892 2310 282 1450 235 937 2100 350 21 e20 e20 e20 302 885 100 20 TOTAL 6037 --- e Estimated MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) NOVEMBER e!9 e378 e641 e602 e870 e378 e!23 el!3 e!23 e85 9.1 199 25 3.1 79 2480 11400 146 5910 119 3170 9190 208 9.7 e8.6 e7.6 e6.7 157 758 36 5.9 37259.7 102 95 90 85 84 82 78 75 72 91 70 67 64 62 60 57 139 71 60 59 58 57 54 50 49 47 46 44 44 43 --- 2065 19 16 13 12 12 12 11 10 10 163 19 12 12 12 11 10 685 58 30 22 19 14 10 9 9 8 8 7 6 6 --- --- 5 4 3 2 2 2 2 2 2 77 3 2 2 2 1 1 848 12 4 3 2 2 1 1 1 1 1 999 .2 .1 .2 .8 .8 .7 .4 .1 .0 .7 .1 .0 .1 .8 .6 .9 .4 .9 .2 .4 .2 .2 .1 .0 .85 .70 .70 --- .15 DECEMBER 43 42 41 40 39 38 38 37 36 35 35 34 33 32 32 36 33 31 31 31 29 29 28 28 27 27 26 45 36 28 86 1106 6 24 5 7 10 8 5 12 19 16 11 9 8 7 6 19 14 5 5 7 7 5 5 5 5 5 5 74 65 39 364 --- 2. 1. 1. 1. 1. 2. 1. . 24 6. 3. 332 388. 69 7 55 80 0 83 57 1 8 5 96 82 76 61 52 4 4 44 40 61 60 39 37 36 36 36 36 0 1 36 84 RIO GRANDE DE ARECIBO BASIN 50028000 RIO TANAMA NEAR UTUADO, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) JANUARY 44 42 36 31 30 29 28 29 28 27 27 27 26 26 25 23 24 23 22 23 22 22 22 22 23 23 23 22 21 20 19 42 34 34 26 22 20 18 16 14 12 10 10 10 10 7 5 5 5 4 4 4 3 3 3 4 6 9 11 11 11 11 5.9 4.5 3.4 2.1 1.7 1.5 1.4 1.2 1.0 .83 .71 .69 .69 .68 . 50 .32 .32 .32 .27 .23 .23 .20 .18 .18 .26 .41 .55 .62 .61 .60 .56 FEBRUARY 19 19 18 18 18 17 19 23 20 21 21 20 18 44 22 20 19 19 24 25 18 22 18 17 17 18 17 17 ___ ___ ___ 10 10 9 10 10 9 10 10 9 8 8 6 6 49 12 10 8 7 10 33 19 13 10 10 9 9 9 7 ___ ___ ___ .52 .48 .44 .49 .48 .42 .51 .59 .49 .48 .48 .31 .30 7.3 .74 .50 .44 .37 1.0 2.5 .95 .85 .51 .43 .41 .43 .42 .34 ___ ___ ___ MARCH 18 17 17 15 14 14 14 14 26 20 21 62 43 35 23 29 33 20 18 19 18 16 16 17 14 14 13 13 13 12 12 5 5 5 5 6 7 8 10 20 18 15 97 29 14 10 37 33 14 11 10 11 14 20 19 11 7 5 5 5 5 6 .27 .24 .22 .23 .22 .26 .32 .36 1.7 1.0 .88 23 3.6 1.3 .60 9.7 4.1 .76 .52 .51 .52 .59 .91 .83 .43 .28 .17 .17 .17 .18 .20 TOTAL 809 32.66 568 23.18 630 54.24 RIO GRANDE DE ARECIBO BASIN 50028000 RIO TANAMA NEAR OTUADO, PR — Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 85 DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE (CPS) (MG/L) (TONS/DAY) (CPS) (MG/L) (TONS/DAY) 12 12 12 12 11 55 24 14 12 12 11 11 11 12 13 21 16 148 72 75 e35 e23 e22 e21 e20 27 28 21 20 19 --- APRIL 6 6 6 5 5 228 106 55 26 10 7 6 6 5 4 18 11 773 147 130 e27 e8 e!7 e9 e!5 20 18 25 9 9 --- TOTAL 802 --- e Estimated MAY 151 8. 2. . 2. 1420 40 30 e2. e. el. e. el. 1. 1. 1. - 1669. 20 20 20 17 14 6 1 83 30 21 18 18 16 15 4 53 9 65 2 44 0 6 6 4 47 46 -- 27 19 19 18 18 17 17 76 211 109 51 37 33 29 29 26 25 24 23 23 26 26 25 26 24 24 23 22 21 21 25 23 1090 8 7 7 7 7 7 255 996 291 63 23 13 10 10 7 5 6 7 8 9 11 12 11 10 10 10 7 4 5 12 12 --- .39 .33 .34 .33 .32 .32 208 2340 122 9.2 2.3 1.1 .82 .74 .50 .33 .39 .47 .50 .61 .76 .82 .73 .63 .62 .58 .41 .25 .27 1.0 .79 2695.85 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CPS) (MG/L) (TONS/DAY) JUNE 40 26 20 23 43 57 22 18 25 31 84 35 21 28 184 49 34 31 27 25 23 22 27 26 22 21 21 20 19 19 --- 1043 63 22 20 19 59 153 64 45 40 75 337 44 33 43 460 49 18 14 11 9 6 5 8 10 10 10 10 10 11 15 --- --- 19 1. 1. 1. 15 63 4. 2. 2. 15 232 5. 1. 10 314 7. 1. 1. - 705. 6 1 2 2 3 6 0 9 6 7 1 78 59 40 29 61 62 60 55 54 53 54 75 -- 10 86 RIO GRANDE DE ARECIBO BASIN 50028000 RIO TANAMA NEAR UTUADO, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL YEAR MEAN DISCHARGE (CFS) 18 18 17 28 53 32 35 47 35 23 21 20 20 22 31 27 22 22 20 19 18 17 17 22 33 26 22 20 19 19 21 764 18625 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) JULY 18 18 17 28 53 32 35 47 35 23 21 20 20 22 31 27 22 22 20 19 18 17 17 22 33 26 22 20 19 19 21 12 13 17 33 118 40 48 92 50 19 18 18 18 18 25 37 22 14 6 3 4 5 6 14 41 20 15 12 13 16 17 , . 4. 40 4. 7. 27 5. 1. 1. 2. 2. 1. 1. 5. 1. . 57 61 78 1 1 9 9 2 98 95 92 1 4 9 2 75 32 15 19 25 27 0 4 4 82 63 67 82 91 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) AUGUST 20 23 23 19 22 25 19 24 265 e64 e55 e46 e67 52 29 24 22 34 23 20 20 29 23 76 37 25 21 39 28 21 32 14 10 10 10 15 15 10 12 900 125 135 81 218 106 19 14 11 34 16 6 5 21 15 525 68 15 11 66 33 11 39 . 1. 1. 4370 30 57 15 119 20 1. 5. 1. 2. 1. 358 7. 1. 23 3. 8. 75 64 63 50 3 2 53 80 4 87 63 4 0 35 26 0 0 9 2 63 2 58 8 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) SEPTEMBER 35 33 102 117 103 120 98 62 240 57 59 44 46 58 38 29 40 31 133 251 100 62 86 130 101 e61 e44 39 34 141 68 27 686 594 365 487 251 85 1070 67 113 55 67 155 92 22 62 37 557 1020 103 111 238 648 308 e90 e54 37 28 667 10 3. 806 579 191 767 97 15 4910 12 37 7. 15 73 10 1. 19 3. 754 3720 35 19 131 839 229 e!6 e7. 3. 2. 912 1 7 8 5 1 9 6 116.19 63202.97 1227 5033.57 2494 14225.7 e Estimated RIO GRANDE DE ARECIBO BASIN 50028000 RIO TANAMA NEAR UTUADO, PR--Continued WATER QUALITY DATA, HATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 87 PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT DATE MAY 1990 08. .. JUN 15. .. AUG 09. .. 09... 24. .. SEP 04. .. 19. .. 24. .. DATE MAY 1990 08. . . JUN 15... AUG 09... 09. .. 24. . . SEP 04. .. 19. .. 24. . . TIME 1800 0140 1710 1740 1750 1820 1630 1750 SED. SUSP. FALL DIAM. PERCENT FINER THAN .016 MM 62 64 37 45 60 43 51 47 DIS- CHARGE, INST. CUBIC FEET PER SECOND 403 432 2850 1290 272 614 805 713 SED. SUSP. FALL DIAM. PERCENT FINER THAN .031 MM 72 70 54 60 76 64 67 64 SEDI- MENT, SUS- PENDED (MG/L) 3220 1320 8250 6940 7460 3990 5270 4630 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .062 MM 92 89 70 80 96 84 84 83 SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) 3500 1540 63400 24200 5500 6610 11500 8910 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .125 MM 98 94 82 91 99 93 92 92 SED. SUSP. FALL DIAM. PERCENT FINER THAN .002 MM 10 30 9 14 18 9 13 10 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .250 MM 99 97 92 98 99 98 97 97 SED. SUSP. FALL DIAM. PERCENT FINER THAN .004 MM 17 38 18 23 30 16 23 19 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .500 MM 100 98 98 99 99 99 99 100 SED. SUSP. FALL DIAM. PERCENT FINER THAN .008 MM 32 48 28 32 46 27 37 32 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN 1.00 MM 100 99 99 100 100 100 100 100 SILT AND CLAY PERCENT OF SUSPENDED SEDIMENT DATE MAY 1990 08.. . 08. . . 08.. . 08. . . 08. . . TIME 1740 1820 1900 1530 1640 STREAM- FLOW, INSTAN- TANEOUS (CFS) 412 368 302 790 1350 SEDI- MENT, SUS- PENDED (MG/L) 2010 2490 1610 5490 8500 SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) 2236 2474 1313 11710 30983 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .062 MM 75 90 90 85 74 88 RIO GRANDE DE ARECIBO BASIN 50028400 RIO TANAMA AT CHARCO HONDO, PR LOCATION.--Lat 18°24'52", long 66°42'52", Hydrologic Unit 21010002 on right bank at abandoned power house at Charco Hondo, 1.5 mi (2.4 km) upstream from mouth, and 4 mi (6 km) south of Arecibo. DRAINAGE AREA.--57.6 mi a (149.2 km a ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--April 1969 to June 1971, October 1981 to current year. GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 60 ft (18 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. Diversion 0.8 mi (1.3 km) upstream for municipal supply of Arecibo. AVERAGE DISCHARGE.--10 years (1969-71,81-90), 86.6 ft'/s (2.452 m'/s), 20.42 in/yr (519 mm/yr), 62,740 acre-ft/yr (77.4 hm'/yr); median of yearly mean discharges, 85 ft'/s (2.41 m'/s), 61,600 acre-ft/yr (76 hm'/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 15,000 ft'/s (425 mVs), May 18, 1985, gage height, 17.95 ft (5.471 m), from floodmark, from rating curve extended above 1,000 ft'/s (28.3 m'/s) on basis of step-backwater analysis; minimum discharge, 3.3 ft'/s (0.093 m'/s), May 28,29, 1989. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 2,000 ft3 /s (56.6 m'/s) and maximum (*): Discharge Date Oct. 2 Oct. 5 Oct. 8 Oct. 17 Oct. 19 Time 1830 1830 1845 1945 1845 (ft'/s) *5,140 3,180 2,790 4,090 2,760 (mVs) 146 90.0 79.0 116 78.2 Gage height (ft) *13.51 11.62 11.16 12.57 11.13 (m) 4.118 3.542 3.402 3.831 3.392 Date Oct. Oct. Aug. Sept. Sept. 21 22 9 9 20 Time 2015 1915 1900 1715 1900 Discharge (ft'/s) 2,220 2, 850 3,430 2,880 2,280 (m'/s) 62.9 80.7 97.1 81.6 64.6 Gage (ft) 10.44 11.23 11.89 11.27 10.51 height (m) 3.182 3.423 3.624 3.435 3.203 Minimum daily discharge, 13 ft'/s (0.368 m3 /s), Mar. 20, Apr. 4. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES DAY OCT NOV DEC APR JUN JUL AUG 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC-FT CFSM IN. CAL YR WTR YR 183 610 587 567 709 438 250 e380 e290 e290 e280 e275 e260 e250 e240 e238 e670 e240 e470 e250 e350 e580 e300 e250 e225 e215 e!88 e200 e250 e200 e!60 10395 335 709 160 20620 5.82 6.71 1989 1990 el50 e!37 e!25 ellS e!09 104 100 93 e97 e!81 e!37 106 96 92 87 81 228 e!83 el!2 e!06 ellO e90 e82 e76 e72 e68 e64 e62 e58 e56 3177 106 228 56 6300 1.84 2.05 TOTAL 26261.9 TOTAL 31440 e54 e52 eSO e48 e47 e45 e44 e44 e43 e42 e40 e40 e39 e38 e37 e36 39 34 34 33 33 31 30 28 27 27 26 26 47 31 69 1214 39.2 69 26 2410 .68 .78 MEAN MEAN 70 39 41 32 29 27 26 26 26 25 25 25 24 23 24 22 22 21 21 22 e20 el9 e!8 e20 e20 e22 e21 e20 e!9 e!8 e!8 785 25.3 70 18 1560 .44 .51 72.0 MAX 86.1 MAX e!8 e!8 e!7 e!7 e!7 e!6 e!7 e20 e!9 e!9 e!9 e!8 e21 33 26 18 14 14 18 20 15 e!7 e!5 e!4 e!4 e!8 e!6 e!5 ___ ___ --- 503 18.0 33 14 998 .31 .32 709 MIN 709 MIN e!8 e!6 e!6 e!5 e!4 e!4 e!4 e!4 18 25 18 79 73 71 29 18 36 19 14 13 18 15 36 45 e20 e!8 e!7 e!7 e!7 e!5 e!4 766 24.7 79 13 1520 .43 .49 4.2 13 e!4 e!4 e!4 e!3 e32 44 68 39 36 36 34 34 38 40 39 36 45 162 119 125 70 51 44 47 42 53 54 45 e40 e38 --- 1466 48.9 162 13 2910 .85 .95 AC-FT 52090 AC-FT 62360 e38 e37 e35 e34 e33 e60 68 254 176 138 100 102 69 e60 e56 e54 e52 e50 e54 e56 e56 e56 e54 e52 e52 e49 e46 e45 e43 e43 e45 2067 66.7 254 33 4100 1.16 1.33 CFSM 1, CFSM 1, e50 e70 e45 e40 e43 76 70 49 50 46 95 93 52 50 292 115 85 82 77 66 63 60 63 61 59 56 56 55 54 53 --- 2126 70.9 292 40 4220 1.23 1.37 ,25 IN. ,50 IN. 53 53 56 63 85 140 114 141 121 90 96 146 81 115 260 133 105 102 99 89 82 65 57 61 63 65 56 53 52 50 55 2801 90.4 260 50 5560 1.57 1.81 16.96 20.30 56 53 57 48 42 55 48 52 294 115 e54 e79 eSO el!2 e54 eSO e54 85 100 54 49 62 88 97 89 58 51 50 68 49 47 2220 71.6 294 42 4400 1.24 1.43 60 62 108 127 162 212 126 94 373 201 106 103 107 101 94 66 56 71 166 314 152 84 104 165 133 107 82 80 79 225 --- 3920 131 373 56 7780 2.27 2.53 e Estimated RIO GRANDE DE ARECIBO BASIN 50028400 RIO TANAMA AT CHARCO HONDO, PR—Continued WATER QUALITY RECORDS PERIOD OF RECORD.-- WATER YEARS MARCH 1983 TO CURRENT YEAR SPECIFIC CON- TEMPERA- DUCTANCE TURE (UMHOS) (DEC C) 89 DATE TIME OCT. 16 0927 NOV. 03 1046 DEC. 15 1229 JAN. 12 1205 FEB. 16 1128 MAR. 08 1054 STREAMFLOW, INSTANTANEOUS (CFS) 222 115 36 24 15.1 5.8 190 232 253 247 225 270 25.0 26.0 26.0 23.0 25.0 23.0 DATE TIME APR. 05 1045 MAY 10 1325 JUNE 08 1136 JULY 12 1150 AUG. 17 1104 SEPT 05 0910 STREAMFLOW, INSTANTANEOUS (CFS) 32.2 102 46.6 142 50.8 85.3 SPECIFIC CON- TEMPERA- DUCTANCE TURE (UMHOS) (DEG C) 220 242 250 221 260 200 21.0 24.0 23.0 22.0 23.0 22.0 90 RIO GRANDE DE ARECIBO BASIN 50029000 RIO GRANDE DE ARECIBO AT CENTRAL CAMBALACHB, PR WATER-QUALITY RECORDS LOGATION.--Lat 18°27'20", long 66°42'10", Hydrologic Unit 21010002, at bridge on unimproved road, about 500 ft (152 m) upstream from Central Cambalache, near Highway 2, 8.3 mi (13.4 km) downstream from Dos Bocas Reservoir, 1.9 mi (3.1 km) downstream from Rio Tanama , and 1.6 mi (2.6 km) southeast of Arecibo. DRAINAGE AREA.--200 mi» (520 km j ), approximately. PERIOD OP RECORD.—Water years 1963-66, 1969 to current year. DATE OCT 1989 26. .. NOV 29. .. FEE 1990 01. .. APR 16. .. JDN 21. . . AUG 23. .. TIME 1030 1345 0745 1515 1150 1100 HARD- NESS TOTAL (MG/L DIS- CHARGE, INST. CUBIC FEET PER SECOND 488 1510 76 119 143 206 HARD- NESS NONCARB WH WAT TOT FLD SPE- CIFIC CON- DUCT- ANCE (US/CM) 212 242 306 273 274 255 CALCIUM DIS- SOLVED PH (STAND- ARD UNITS) 7.30 7.80 7.90 8.50 8.00 7.80 MAGNE- SIUM, DIS- SOLVED TEMPER- ATURE WATER (DEG C) 24.5 24.5 24.0 28.0 28.5 26.0 SODIUM, DIS- SOLVED TUR- BID- ITY (NTU) 94 57 5.4 1.3 2.0 2.5 SODIUM AD- SORP- TION OXYGEN, DIS- SOLVED (MG/L) 8.1 7.6 7.0 10.4 7.8 8.4 POTAS- SIUM, DIS- SOLVED OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 96 90 81 130 99 101 ALKA- LINITY WAT WH TOT FET FIELD OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 39 12 14 12 11 16 SULFIDE TOTAL COLI- FORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) K7500 K610 K860 200 470 500 SULFATE DIS- SOLVED STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) K16000 2200 260 K30 K70 400 CHLO- RIDE, DIS- SOLVED DATE OCT 1989 26. . . NOV 29. .. FEB 1990 01. . . APR 16. .. JUN 21. .. AUG 23. . . AS MG/L AS (MG/L (MG/L CACO3) CACO3 (MG/L RATIO AS CA) AS MG) AS NA) (MG/L MG/L AS (MG/L (MG/L AS K) 96 4 31 110 7 35 120 9 39 4.6 7.5 6.1 10 5.3 9.1 0.3 1.9 0.4 1.7 0.4 2.1 CACO3 89 98 130 110 110 110 <0.5 10 <0.5 8.7 6.2 (MG/L AS S) AS S04) AS CL) 7.7 8.6 9.5 DATE OCT 1989 26.. . NOV 29.. . FEB 1990 01.. . APR 16.. . OUN 21. . . AUG 23.. . FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.10 -- -- <0.10 -- 0.10 SILICA, DIS- SOLVED (MG/L AS SIO2) 17 — -- 18 -- 17 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 133 -- -- 154 -- 154 SOLIDS, DIS- SOLVED (TONS PER DAY) 175 __ -- 49.5 — 85.7 RESIDUE TOTAL AT 105 DEG. C, SUS- PENDED (MG/L) 8 78 12 3 12 15 NITRO- GEN, NITRATE TOTAL (MG/L AS N) 0.88 0.88 0.49 -_ 0.29 0.39 NITRO- GEN, NITRITE TOTAL (MG/L AS N) 0.02 0.02 0.01 <0.01 0.01 0.01 NITRO- GEN, N02+N03 TOTAL (MG/L AS N) 0.90 0.90 0.50 0.30 0.30 0.40 NITRO- GEN, AMMONIA TOTAL (MG/L AS N) 0.05 0.05 0.03 <0.01 0.04 0.13 NITRO- GEN, ORGANIC TOTAL (MG/L AS N) 0.45 0.35 0.17 -- 0.36 0.67 K = non-ideal count RIO GRANDS DE ARECIBO BASIN 50029000 RIO GRANDE DE ARECIBO AT CENTRAL CAMBALACHE, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 91 DATE OCT 1989 26.. . NOV 29.. . FEB 1990 01... APR 16.. . JON 21.. . AUG 23... DATE OCT 1989 26... NOV 29.. . FEB 1990 01.. . APR 16... JON 21.. . AUG 23.. . NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.50 0.40 0.20 <0.20 0.40 0.80 IRON, TOTAL RECOV- ERABLE (UG/L AS FE) 5200 -- -- 140 -- -- NITRO- GEN, TOTAL (MG/L AS N) 1.4 1.3 0.70 — 0.70 1.2 LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) 5 — — 1 — — NITRO- GEN, TOTAL (MG/L AS N03) 6.2 5.8 3.1 -- 3.1 5.3 MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) 200 _- -- 20 -- -- PHOS- PHORUS ARSENIC TOTAL TOTAL (MG/L (UG/L AS P) AS AS) 0.06 <1 0.11 0.06 0.02 <1 0.03 0.04 MERCURY TOTAL SELE- RECOV- NIUM, ERABLE TOTAL (UG/L (UG/L AS HG) AS SB) 0.10 <1 __ __ <0.10 <1 __ — BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 — -- <100 — " SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) <1 -- -- <1 -- -- BORON, TOTAL RECOV- ERABLE (UG/L AS B) <10 -- -- 10 -- "" ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) 20 -- -- <10 -- -- CHRO- CADMIUM MIUM, TOTAL TOTAL RECOV- RECOV- ERABLE ERABLE (UG/L (UG/L AS CD) AS CR) <1 6 — — 2 <1 __ " CYANIDE TOTAL PHENOLS (MG/L TOTAL AS CN) (UG/L) <0.010 1 __ — <0.010 8 __ __ COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) 20 -- __ <10 -- " METHY- LENB BLUB ACTIVE SUB- STANCE (MG/L) <0.01 -- — 0.02 — -- PBSTBCIDE ANALYSES DATE JUN 1990 21.. . TIME 1150 PCB, TOTAL (UG/L) ALDRIN, TOTAL (UG/L) <0.010 CHLOR- DANE, TOTAL (UG/L) DDD, TOTAL (UG/L) DDE, TOTAL (UG/L) DOT, TOTAL (UG/L) DI- AZINON, TOTAL (UG/L) DI- ENDO- ELDRIN SULFAN, TOTAL TOTAL (UG/L) (UG/L) <0.010 <0.010 <0.010 <0.01 <0.010 <0.010 DATE JUN 1990 21... ENDRIN, TOTAL (UG/L) <0.010 ETHION, TOTAL (UG/L) <0.01 HEPTA- CHLOR, TOTAL (UG/L) <0.010 HEPTA- CHLOR EPOXIDE TOTAL (UG/L) <0.010 LINDANB TOTAL (UG/L) <0.010 MALA- THION, TOTAL (UG/L) <0.01 MBTH- OXY- CHLOR, TOTAL (UG/L) <0.01 METHYL PARA- THION, TOTAL (UG/L) <0.01 METHYL TRI- THION, TOTAL (UG/L) <0.01 MI REX, TOTAL (UG/L) <0.01 DATE JON 1990 21.. . PARA- THION, TOTAL (UG/L) <0.01 NAPH- THA- LENES, POLY- CHLOR. TOTAL (UG/L) <0.10 PBR- THANE TOTAL (UG/L) <0.1 TOX- APHENE, TOTAL (UG/L) <1 TOTAL TRI- THION (UG/L) <0.01 2,4-D, TOTAL (UG/L) 0.01 2,4,5-T TOTAL (UG/L) <0.01 2, 4-DP TOTAL (UG/L) <0.01 SILVEX, TOTAL (UG/L) <0.01 92 THIS PAGE WAS LEFT BLANK INTENTIONALLY 93 O C E A N O ATLANTICO Drainage boundaries indeterminate in limestone terrene igneous and sedimentary rocNs Rtb uiebo'rt bts»in / Mop oreo EXPLANATION SURFACE-WATER STATION AND NUMBER 307 QUALITY-OF-WATER STATION AND NUMBER 210 WELL AND WELL NUMBER 032290 LAKE-ELEVATION STATION 2 S « MILES ——I——!~\——TJ 0 i t 3 4 S 6KILOKETERS Figure 15.--Rio Grande de Manati basin. 94 RIO GRANDE DE MANATI BASIN 50030700 RIO OROCOVIS NEAR OROCOVIS, PR WATER-QUALITY RECORDS LOCATION.—Lat 18°14'20", long 66°22'58", at flat low bridge about 300 ft (91 m) northwest of Highway (1.6 km) north of Orocovis plaza. DRAINAGE AREA.--10.1 mi> (26.2 km1 ). PERIOD OF RECORD.—Water year 1979 to current year. 568, 1.0 mi DATE OCT 1989 24... DEC 13. .. FEB 1990 16. .. APR 11. .. JUN 18... AUG 13... DATE OCT 1989 24. .. DEC 13... FEB 1990 16. .. APR 11. .. JUN 18. .. AUG 13. .. TIME 1145 1400 1215 1500 1515 1530 HARD- NESS TOTAL (MG/L AS CACO3) 65 — — 140 — 150 DIS- CHARGE, INST. CUBIC FEET PER SECOND 77 9.8 7.6 4.4 4.2 3.4 HARD- NESS NONCARB WH WAT TOT FLD HG/L AS CACO3 5 -- -- 10 -- 13 SPE- CIFIC CON- DUCT- ANCE (US /CM) 177 284 286 216 325 349 CALCIUM DIS- SOLVED (MG/L AS CA) 15 — — r 36 — 40 PH (STAND- ARD UNITS) 7.80 7.90 8.40 9.00 8.50 8.00 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 6.6 -- -- 13 -- 13 TEMPER- ATURE WATER (DEG C) 23.0 22.5 21.0 26.0 25.5 26.5 i SODIUM, * DIS- \ SOLVED (MG/L AS NA) 9.0 — " 16 — 16 TUR- BID- ITY (NTU) 32 3.7 10 1.0 10 3.5 SODIUM AD- . SORP- \ TION \RATIO 0.5 / 0.6 -- 0.6 OXYGEN, DIS- SOLVED (MG/L) 8.4 8.0 8.9 8.8 7.7 7.2 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 2.1 /: 1.6 — 1.5 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 101 96 102 112 97 * 93 ALKA- LINITY WAT WH TOT FET FIELD MG/L AS CACO3 61 120 120 120 140 140 OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 11 18 13 18 12 22 SULFIDE TOTAL (MG/L AS S) 0.8 — — <0.5 — — COLI- FORM, FECAL, 0.7 DM-MF (COLS./ 100 ML) K11000 510 370 300 5800 K990 SULFATE DIS- SOLVED (MG/L AS S04) i 10 "^ -- >i -- 17 -- 9.7 STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) 21000 K82 420 310 2000 K1300 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 11 — — 17 — 18 , SOLIDS, RESIDUE DATE OCT 1989 24... DEC 13... FEB 1990 16... APR 11... JUN 18... AUG 13... FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.10 -- -- <0.10 -- 0.10 SILICA, DIS- SOLVED (MG/L AS SIO2) 24 — — 34 — 33 SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 114 -- — 216 -- 215 SOLIDS, DIS- SOLVED (TONS PER DAY) 23.8 — — 2.57 — 1.97 TOTAL AT 105 DEG. C, SUS- PENDED (MG/L) 33 1 15 7 1 10 NITRO- GEN, NITRATE TOTAL (MG/L AS N) 1.27 — 1.08 1.29 1.59 1.89 NITRO- GEN, NITRITE TOTAL (MG/L AS N) 0.03 <0.01 0.02 0.01 0.01 0.01 NITRO- GEN, N02+N03 TOTAL (MG/L AS N) 1.30 2.20 1.10 1.30 1.60 1.90 NITRO- GEN, AMMONIA TOTAL (MG/L AS N) 0.04 0.04 0.03 0.01 0.02 0.05 NITRO- GEN, ORGANIC TOTAL (MG/L AS N) 0.16 0.16 0.37 0.59 — 0.75 K = non-ideal count RIO GRANDE DE MANATI BASIN 50030700 RIO OROCOVIS NEAR OROCOVIS, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 95 DATE OCT 1989 24... DEC 13.. . FEB 1990 16.. . APR 11. .. JUN 18. .. AUG 13.. . DATE OCT 1989 24.. . DEC 13.. . FEB 1990 16.. . APR 11.. . JUN 18.. . AUG 13.. . NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.2 0.2 0.4 0.6 <0.2 0.8 IRON, TOTAL RECOV- ERABLE (UG/L AS FE) 3400 -- -- 500 -- -- NITRO- GEN, TOTAL (MG/L AS N) 1.5 2.4 1.5 1.9 — 2.7 LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) 5 -- -- 1 -- — NITRO- GEN, TOTAL (MG/L AS N03) 6.6 11 6.6 8.4 -- 12 MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) 90 -- -- 40 -- -- PHOS- PHORUS TOTAL (MG/L AS P) 0.08 0.01 0.19 0.34 0.30 0.44 MERCURY TOTAL RECOV- ERABLE (UG/L AS HG) 0.10 -- -- <0.10 -- — BARIUM, TOTAL ARSENIC RECOV- TOTAL BRABLE (UG/L (UG/L AS AS) AS BA) <1 <100 __ __ <1 <100 __ .. SILVER, SELE- TOTAL NIUM, RECOV- TOTAL BRABLE (UG/L (UG/L AS SE) AS AG) <1 <1 __ __ <1 <1 __ __ BORON, TOTAL RECOV- ERABLE (UG/L AS B) <10 -- -- <10 -- " ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) 20 -- -- <10 -- -- CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- 3 -- " CYANIDE TOTAL (MG/L AS CN) <0.010 -- — <0.010 -- — CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) 7 -- -- 2 -- " PHENOLS TOTAL (UG/L) 12 -- -- 12 -- -- COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) 10 — -- <10 — " METHY- LENE BLUE ACTIVE SUB- STANCE (MG/L) 0.02 -- -- 0.05 — — 96 RIO GRANDB DB MANATI BASIN 50031200 RIO GRANDB DE MANATI NEAR MOROVIS, PR LOCATION.--Lat 18°17'45", long 66°24'47" / Hydrologic Unit 21010001, on right bank , 0.1 mi (0.2 km) downstream from Quebrada Perchas, 0.8 mi (1.3 km) upstream from Rio Sana Muerto, and 2.2 mi (3.5 km) south of Morovis. DRAINAGE AREA.--55.2 mi 2 (143.0 km2 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.—January 1965 to current year. GAGE.--Water-stage recorder and concrete control. Elevation of gage is 440 ft (134 m), from topographic map. Feb. 2, 1966 to Apr. 27, 1967, staff gage read twice daily. REMARKS.--Records fair. Public water-supply pumpage, about 300 ft (91 m) above the station, influences low-flow discharges. Gage-height and precipitation satellite telemetry at station. AVERAGE DISCHARGE.--25 years (1966-90), 102 ft'/s (2.889 m'/s), 25.09 in/yr (615 mm/yr), 73,900 acre-ft/yr (91.1 hm'/yr); median of yearly mean discharges, 89 ft'/s (2.52 m3 /s), 64,500 acre-ft/yr (80 hm'/yr) . EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 48,000 ft'/s (1,359 m'/s). May 18, 1985, gage height, 17.89 ft (5.453 m) , from floodmarks, from rating curve extended above 200 ft'/s (5.66 m'/s) on basis of computations of flow over broad-crested weir and step-backwater analysis; minimum discharge, 4.4 ftVs (0.125 m3 /s). Apr. 15, 1984. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 3,500 ft'/s (99.1 m'/s) and maximum (*): Discharge (ft'/s) (m'/s) Gage height (ft) (m) Date Time Oct. 22 1700 *3,910 111 *5.34 1.628 Minimum discharge, 11 ftVs (0.312 mVs), Aug. 28. Discharge (ft'/s) (m'/s) Gage height (ft) (m) Date Time No other peak greater than base discharge. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC-FT CFSM IN. OCT 138 201 216 159 216 149 116 102 94 83 79 73 72 76 88 102 155 154 182 208 326 625 678 390 237 261 231 172 164 145 131 6023 194 678 72 11950 3.52 4.06 NOV 138 123 117 112 122 140 132 122 117 109 104 100 99 115 104 94 89 85 82 80 77 73 72 70 67 67 66 64 62 61 2863 95.4 140 61 5680 1.73 1.93 DEC 61 60 59 57 57 57 56 54 53 50 50 49 48 48 47 48 47 44 45 44 42 40 39 39 38 39 37 38 59 47 43 1495 48.2 61 37 2970 .87 1.01 JAN 41 40 40 37 35 34 35 36 34 34 35 34 32 31 33 31 36 33 38 41 37 31 30 39 31 29 33 33 27 24 24 1048 33.8 41 24 2080 .61 .71 25 23 24 24 22 21 21 34 31 36 25 22 23 99 60 39 32 32 44 33 31 49 57 41 34 58 45 38 1023 36.5 99 21 2030 .66 .69 39 36 31 28 27 27 27 25 41 81 110 355 450 478 212 181 170 121 92 74 65 58 55 51 50 53 49 46 44 43 42 3161 102 478 25 6270 1.85 2.13 39 37 35 35 35 34 33 32 32 32 31 30 32 39 32 30 128 192 218 210 128 88 59 45 45 112 65 49 39 36 1952 65.1 218 30 3870 1.18 1.32 39 42 35 34 35 30 41 130 262 171 148 86 61 56 49 41 39 35 32 30 29 28 26 24 25 24 26 23 22 21 21 1665 53.7 262 21 3300 .97 1.12 20 21 22 23 21 29 21 19 22 19 18 17 17 18 95 58 27 24 22 21 19 20 22 28 45 29 24 23 23 22 789 26.3 95 17 1560 .48 .53 24 25 22 23 25 25 26 28 25 25 26 24 23 32 29 57 47 116 46 33 27 25 25 24 26 28 28 23 21 20 18 946 30.5 116 18 1880 .55 .64 17 19 24 20 21 23 22 24 21 21 36 22 38 109 32 23 20 19 18 16 15 23 28 22 18 17 14 12 23 81 23 821 26.5 109 12 1630 .48 .55 19 34 49 81 48 79 112 53 50 76 35 47 318 231 128 91 49 36 32 26 23 21 20 64 108 116 45 35 31 38 2095 69.8 318 19 4160 1.27 1.41 CAL YR 1989 WTR YR 1990 TOTAL 25436.4 MEAN 69.7 MAX 1800 MIN 8.0 AC-FT 50450 CFSM 1.26 IN 17.14 TOTAL 23881 MEAN 65.4 MAX 678 MIN 12 AC-FT 47370 CFSM 1.19 IN. 16.09 RIO GRANDE DE MANATI BASIN 50031200 RIO GRANDE DE MANATI NEAR MOROVIS, PR—Continued WATER-QUALITY RECORDS PERIOD OF RECORD.--Water years 1968 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 97 DATE OCT 1989 24. .. DEC 13. .. FBB 1990 16. . . APR 11. . . JUN 15. . . AUG 17. .. TIME 0815 1045 1000 1215 0930 1030 DIS- CHARGE, INST. CUBIC FEET PER SECOND e430 48 39 31 93 20 SPE- CIFIC CON- DO CT- ANCE (OS /CM) 148 268 238 202 240 254 PH (STAND- ARD UNITS) 7.20 7.70 8.00 8.60 8. 00 8. 00 TEMPER- ATURE WATER (DEG C) 22.0 22.5 21.0 27.1 25.5 27.0 TUR- BID- ITY (NTU) 270 6.9 20 2.5 10 17 OXYGEN, DIS- SOLVED (MG/L) 8.4 8.8 4.3 9.5 6.9 7.7 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 97 101 48 118 84 96 OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 37 21 16 16 12 17 COLI- FORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) K14000 K110 K1500 K43 K11000 430 STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) 9100 K110 K1600 K43 3300 88 DATE OCT 1989 24. . . DEC 13. .. FEE 1990 16. . . APR 11. . . JUN 15. . . AUG 17. .. HARD- NESS TOTAL (MG/L AS HARD- NESS NONCARB WH WAT TOT FLD MG/L AS CALCIUM DIS- SOLVED (MG/L MAGNE- SIUM, DIS- SOLVED (MG/L SODIUM, DIS- SOLVED (MG/L SODIUM AD- SORP- TION RATIO POTAS- SIUM, DIS- SOLVED (MG/L ALKA- LINITY WAT WH TOT PET FIELD MG/L AS SULFIDE TOTAL (MG/L SULFATE DIS- SOLVED (MG/L CHLO- RIDE, DIS- SOLVED (MG/L CACO3) CACO3 55 AS CA) AS MG) AS NA) 13 5.5 8.3 30 11 24 10 AS K) 0.5 2.7 0.6 1.8 0.5 2.5 45 110 90 120 100 95 AS S) AS SO4) AS CL) <0.5 11 <0.5 7.4 15 16 SOLIDS, RESIDUE DATE OCT 1989 24. . . DEC 13. .. FEE 1990 16. .. APR 11. . . JUN 15. .. AUG 17. .. FLUO- RIDB, DIS- SOLVED (MG/L AS F) 0.10 -- -- <0.10 -- <0.10 SILICA, DIS- SOLVED (MG/L AS SIO2) 20 -- -- 27 -- 27 SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 99 -_ 173 -- 156 SOLIDS, DIS- SOLVED (TONS PER DAY) -- -- -- 14 .4 -- 8.42 TOTAL AT 105 DEG. C, SUS- PENDED (MG/L) 113 21 24 9 6 21 NITRO- GEN, NITRATE TOTAL (MG/L AS N) 1.39 -- 1.06 -- 0.29 0.48 NITRO- GEN, NITRITE TOTAL (MG/L AS N) 0. 11 <0.01 0.04 <0.01 0.01 0.02 NITRO- GEN, NO2+NO3 TOTAL (MG/L AS N) 1.50 0.60 1.10 <0.10 0.30 0.50 NITRO- GEN, AMMONIA TOTAL (MG/L AS N) 0.14 0.02 0.05 <0.01 0.03 0.02 NITRO- GEN, ORGANIC TOTAL (MG/L AS N) 0.66 -- 0.45 -- 0.27 0.58 K = non-ideal count e = estimate 98 RIO GRANDS DE MANATI BASIN 50031200 RIO ORANDE DE MANATI NEAR MOROVIS, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTMBER 1990 DATE OCT 1989 24.. . DEC 13.. . FEB 1990 16. . . APR 11.. . JUN 15.. . AUG 17.. . DATE OCT 1989 24.. . DEC 13.. . FEB 1990 16.. . APR 11.. . JUN 15.. . AUG 17.. . NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.8 <0.2 0.5 0.3 0.3 0.6 IRON, TOTAL RECOV- ERABLE (UG/L AS FE) 24000 -- -- 160 -- -- NITRO- GEN, TOTAL (MG/L AS N) 2.3 -- 1.6 — 0.6 1.1 LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) 7 -- — <1 -- -- NITRO- GEN, TOTAL (MG/L AS N03) 10 __ 7.1 -- 2.7 4.9 MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) 430 __ -- 20 -- __ PHOS- PHORUS ARSENIC TOTAL TOTAL (MG/L (UG/L AS P) AS AS) 0.17 <1 0.06 0.10 0.03 <1 0.06 0.07 MERCURY TOTAL SBLE- RECOV- NIUM, ERABLE TOTAL (UG/L (UG/L AS HG) AS SE) 0.10 <1 __ __ <0.10 <1 __ __ BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 -- — <100 — -- SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) <1 __ — <1 — — CHRO- BORON, CADMIUM MIUM, TOTAL TOTAL TOTAL RECOV- RECOV- RECOV- ERABLE ERABLE ERABLE (UG/L (UG/L (UG/L AS B) AS CD) AS CR) 20 2 42 __ __ 10 <1 1 __ — — — — — — ZINC, TOTAL RECOV- CYANIDE ERABLE TOTAL PHENOLS (UG/L (MG/L TOTAL AS ZN) AS CN) (UG/L) 50 <0.010 2 __ __ <10 <0.010 10 __ __ COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) 60 -- -- <10 -- — — METHY- LENE BLUE ACTIVE SUB- STANCE (MG/L) <0.01 -- -- 0.10 -- -- RIO GRANDE DE MANATI BASIN 99 50032290 LAGO EL COINED AT DAMSITE, PR LOCATION.—Lat 18°09'41", long 66°51'48", Hydrologic Onit 21010001, at damsite on Rio Toro Negro, 3.0 mi (4.8 km) northwest from Villalba plaza and 1.9 mi (3.1 km) northeast of Cerro Maravillas. The reservoir itself fixes the territorial limits between the Municipality of Ciales and Orocovis. DRAINAGE AREA.--1.64 mi> (4.248 km a ). PERIOD OF RECORD.--May 1988 to current year. ELEVATION RECORDS GAGE.--Water stage recorder. Datum of gage is mean sea level. REMARKS.--Lago Guineo was completed in 1931. It provides a maximum storage of approximately 2,180 ac-ft (2.688 hm3 ) for power and irrigation. Waters are discharged through an outlet power tunnel into the Rio Toro Negro and coveyed to the head water works of Toro Negro Hydroelectric Plant No.2, for energy generation at Toro Negro Hydroelectric plant No.l, and are discharged into the Guayabal Reservoir to be later used for irrigation at South Coast Irrigation System. The dam is rockfill with a vertical concrete corewall, rock toes, and riprap facing of upstream slope, with a total length of 565 ft (172 m), a maximum structural height of 125 ft (38 m) to top of corewall. The uncontrolled morning-glory tunnel spillway crest has an elevation of 2,966 ft (904 m) above mean sea level and a design capacity of 7,000 ft'/s. The dam is owned by Puerto Rico Electric Power Authority. Gage-height and precipitation satellite telemetry at station. EXTREMES OBSERVED FOR PERIOD OF RECORD.--Maximum elevation 2,960.77 ft (902.44 m), Oct. 30, 1989; minimun elevation, 2,919.79 ft (899.95 m), May 27, 1988. EXTREMES OBSERVED FOR CURRENT YEAR.--Maximum elevation, 2,960.77 ft (902.44 m), Oct. 30; minimun elevation, 2,926.05 ft (891.86 m), Aug. 6. DAY Capacity Table (based on data from Puerto Rico Electric Power Authority) Elevation, in feet 2, 872 2, 919 2,925 Contents, in acre-feet 0 361 491 Elevation, in feet 2,943 2,950 2,961 Contents, in acre-feet 1,029 1,308 1,810 ELEVATION (FEET NGVD), WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 OBSERVATION AT 24:00 VALUES NOV DEC JAN MAR APR SEP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN MAX MIN 2947. 2949. 2949. 2949. 2948. 2948. 2948, 2951. 2951. 2951. 2951. 2951. 2950. 2950. 2950. 2950. 2950. 2950, 2950. 2954, 2955, 2956. 2958. 2958. 2958. 2959. 2959. 2958. 2960, 2960. 2960. 2953. 2960. 2947. ,59 ,19 .33 ,13 ,92 ,96 ,69 ,30 ,27 ,12 .04 .21 .91 .53 ,45 ,98 , 86 ,54 ,34 ,27 .72 .04 ,38 ,72 ,89 .15 ,03 .77 .72 ,51 ,33 .32 .72 .59 2960 2959 2959 2959 2959 2959 2959 2959 2958 2958 2958 2958 2958 2951 2951 .05 .77 .47 .11 .36 .23 .00 .19 .99 .69 .36 .55 .31 A A A A A A A A A A A A A A A .70 .23 --- ___ ___ ___ 2951 2951 2951 2950 2949 2949 2948 2947 2947 2947 2947 2946 2946 2945 2945 2944 2943 2943 2942 2942 2941 2941 2940 2940 2940 2940 2940 2940 2940 2939 2940 2944 2951 2939 .03 . 12 .22 .27 .52 . 09 .23 .63 .73 .83 .37 .56 .09 .77 . 69 . 87 .95 .51 . 97 .41 .87 .29 .51 .61 .71 .73 . 81 .89 .24 .25 .27 .84 .22 .25 2940 2940 2940 2940 2940 2940 2940 2939 2939 2939 2939 2938 2937 2937 2937 2936 2936 2936 2935 2935 2935 2935 2934 2933 2933 2933 2932 2932 2931 2931 2931 2936 2940 2931 .75 .97 .67 .33 .15 .25 .33 .75 .44 .15 .25 .49 .69 .78 .51 .74 .39 .09 .81 .88 .95 .33 .03 .75 .54 .34 .10 .18 .99 .68 .75 .74 .97 .68 2931 2931 2931 2932 2932 2932 2932 2932 2932 2932 2932 2932 2932 2932 2933 2933 2933 2933 2933 2933 2932 2931 2931 2930 2930 2930 2930 2930 2932 2933 2930 .82 . 89 .95 . 00 .07 .12 .23 .29 .37 .43 .56 .65 .73 .95 .05 .13 .21 .28 .33 .42 .87 .77 .11 .26 .34 .44 .47 .54 ___ ___ --- . 12 .42 .26 2930, 2930. 2930, 2930, 2930, 2930, 2930 2929, 2929, 2929, 2929, 2929, 2929, 2929 2928 2928 2928 2928 2928 2928 2928 2928, 2929 2929 2929 2929 2929 2929 2929 2929 2929 2929 2930 2928 .59 .65 .69 .75 .79 .85 .85 .99 .42 .47 .54 .65 .79 .96 .87 .70 .75 .79 .85 .89 .94 .99 .04 .09 .12 .16 .19 .23 .26 .30 .33 .56 .85 .70 2929 2929 2929 2929 2929 2929 2929 2929 2929 2929 2929 2929 2929 2929 2929 2929 2930 2930 2930 2930 2930 2930 2930 2930 2930 2930 2930 2930 2930 2930 2930 2930 2929 .36 .39 .43 .47 .50 .53 .57 .59 .61 .64 .68 .70 .78 .86 .91 .95 .04 . 16 .59 .70 .74 .78 .81 .84 .50 .54 .57 .15 . 16 .18 --- .02 .84 .36 2930 2930 2930 2930 2930 2930 2930 2930 2930 2930 2931 2931 2931 2931 2931 2930 2929 2929 2929 2929 2929 2929 2929 2929 2929 2929 2929 2929 2928 2928 2928 2929 2931 2928 .20 .21 .23 .22 .24 .25 .34 .38 .40 .88 .00 .03 .06 .09 .11 .59 .72 .73 .76 .78 .78 .18 .18 .19 .20 .20 .21 .24 .64 .67 .68 .95 .11 .64 2928. 2928. 2928. 2928. 2928. 2927. 2927. 2927. 2927. 2927. 2927. 2927. 2927. 2927. 2929. 2929. 2929. 2929. 2929. 2928. 2928. 2928. 2928. 2928. 2928. 2928. 2929. 2929. 2928. 2927. - 2928. 2929. 2927. 70 70 72 86 89 38 39 40 40 40 40 41 41 56 06 17 23 28 35 59 62 65 84 92 96 99 02 02 20 73 -- 41 35 38 2927 2927 2927 2927 2927 2927 2927 2927 2927 2927 2927 2927 2927 2927 2927 2927 2927 2927 2927 2927 2926 2926 2926 2926 2926 2926 2926 2926 2926 2926 2926 2927 2927 2926 .72 .73 .72 .73 .75 .76 .84 .87 .87 .46 .47 .47 .56 .58 .80 .78 .93 .42 .20 .22 .41 .44 .40 .46 .55 .80 .89 .93 .96 .98 .99 .31 .93 .40 2927. 2927. 2927. 2927. 2927. 2926. 2926. 2926. 2926. 2926. 2926. 2926. 2926. 2926. 2926. 2926. 2926. 2926. 2926. 2926. 2926. 2926. 2926. 2927. 2927. 2927. 2927. 2927. 2928. 2928. 2928. 2926. 2928. 2926. 00 04 05 08 16 24 26 27 28 34 36 37 38 30 31 30 31 31 31 28 29 44 98 08 11 13 11 73 43 57 80 83 80 24 2928 2928 2933 2933 2933 2934 2933 2933 2937 2938 2938 2938 2939 2939 2939 2940 2940 2940 2940 2940 2941 2941 2942 2943 2943 2944 2944 2944 2944 2945 2938 2945 2928 .91 .98 .59 .85 .99 .24 .57 .54 .67 .21 .57 .79 .00 .30 .84 .39 .03 .02 .31 .88 .11 .35 .60 .23 .77 .09 .33 .12 .54 .53 .94 .53 .91 A No gage-height record. 100 RIO GRANDE DE MANATI BASIN 50032590 LAGO DE MATROLLAS AT DAMSITE, PR LOCATION.--Lat 18°12'46", Long 66°28'50", Hydrologic Unit 21010001, in concrete house at damsite, and 5.8 mi (9.3 km) southwest of Orocovis. DRAINAGE AREA.--4.46 mi» (11.55 km»). ELEVATION RECORDS PERIOD OF RECORD.--May 1988 to current year. GAGE.--Water-stage recorder. Datum of gage is mean sea level. REMARKS.--Lago Matrullas was completed in 1934. The dam is an earthfill structure about 120 ft ( 36.6 m) height, a top width of 30 ft (9 m) and a length of 710 ft (216 m), and has a maximum storage capacity of about 4,274 ac-ft (5.220 hm3 ) at top of dam elevation. The Matrullas Dam is owned by the Puerto Rico Electric Power Authority and is part of the Toro Negro Hydroelectric Project; a project developed by the P.R.E.P.A. for the primary purpose of generating electric power. Discharges from the Power Plants are collected by the Jacaguas River which flows into Guayabal Dam, at which dam they are regulated for irrigation of lands served by the Juana Diaz Canal. Gage-height and precipitation satellite telemetry at station. EXTREMES OBSERVED FOR PERIOD OF RECORD.--Maximum elevation 2,413.49 ft (735.63 m) , Sept. 30, 1989; minimum elevation 2,392.81 ft (729.33 m) , Sept. 10, 1989. EXTREMES OBSERVED FOR CURRENT YEAR.--Maximum elevation, 2,413.43 ft (735.63 m), Oct. 2; minimum elevation 2,403.11 ft (732.47 m). May 24-26. DAY Capacity Table (based on data from Puerto Rico Electric Power Authority) Elevation, in feet 2,338 2,360 Contents, in acre-feet 302 Elevation, in feet 2,399 2,415 Contents, in acre-feet 1,845 2,945 ELEVATION (FEET NGVD), WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 OBSERVATION AT 24:00 VALUES NOV MAY JUN JUL AUG 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN MAX MIN 2412.79 2413.36 2412.89 2412.47 2412.21 2411.89 2411.61 2412.82 2412.45 2412.05 2411.79 2412.17 2412.23 2412.34 2412.33 2412.33 2412.29 2412.27 2412.27 2413.14 2412.94 2412.86 2413.33 2412.68 2412.99 2413.25 2412.81 2412.74 2413.21 2412.67 2412.53 2412.57 2413.36 2411.61 2412. 2412. 2412. 2412. 2412. 2412. 2412. 2412. 2412. 2412. 2412. 2412. 2412. 2412. 2412. 2412. 2411. 2411. 2411. 2411. 2411. 2411. 2411. 2410. 2410. 2410. 2410. 2410. 2410. 2410.- 2411. 2412. 2410. 39 29 44 44 64 53 46 39 36 36 28 52 35 25 19 07 99 89 74 55 38 23 05 91 70 85 77 67 59 43 -- 79 64 43 2410 2410 2410 2410 2410 2410 2410 2409 2409 2410 2410 2409 2409 2409 2409 2409 2408 2408 2408 2408 2407 2407 2407 2407 2407 2407 2407 2407 2407 2406 2407 2408 2410 2406 .29 .45 .67 .53 .31 .17 .00 .82 .94 .13 .02 .84 .61 .43 .43 .19 .80 .58 .34 .03 .76 .50 .20 .22 .35 .19 .07 .17 .21 .93 .13 .82 .67 .93 2407 2407 2407 2407 2407 2407 2407 2407 2407 2407 2407 2406 2406 2406 2406 2406 2406 2405 2405 2405 2406 2405 2405 2405 2405 2405 2404 2404 2404 2404 2404 2406 2407 2404 .61 .70 .59 .48 .48 .60 .74 .58 .38 .19 .11 .89 .53 .54 .56 .37 .13 .97 .90 .99 .11 .92 .64 .46 .26 .06 .74 .73 .50 .26 .30 .30 .74 .26 2404 2404 2404 2404 2404 2404 2405 2405 2405 2405 2405 2405 2405 2406 2406 2406 2406 2406 2407 2407 2407 2406 2406 2406 2406 2406 2406 2406 2405 2407 2404 .40 .51 .61 .70 .80 .90 .03 .20 .36 .49 .61 .76 .90 .31 .45 .61 .73 .86 .00 .10 .14 .90 .58 .19 .16 .30 .40 .50 _-_ ___ --- .91 .14 .40 2406 2406 2406 2406 2406 2407 2407 2406 2406 2406 2406 2407 2407 2408 2407 2407 2407 2407 2408 2407 2407 2407 2407 2407 2407 2407 2407 2407 2408 2408 2408 2407 2408 2406 .61 .70 .78 .85 .92 .02 .10 .88 .78 .84 .98 .35 .76 .06 .92 .76 .84 .92 .02 .93 .75 .77 .75 .81 .91 .87 .91 .99 .11 .21 .32 .53 .32 .61 2408.42 2408.53 2408.60 2408.68 2408.77 2408.87 2408. 97 2409. 03 2408.83 2408.53 2408.39 2408.07 2408.17 2408.27 2408.32 2408.42 2408.22 2408.00 2408.23 2408.66 2408.81 2408.90 2408.98 2409.06 2409.16 2409.28 2409.37 2409.44 2409.51 2409.27 --- 2408.72 2409.51 2408.00 2408 2408 2407 2407 2407 2407 2407 2406 2406 2406 2405 2405 2405 2405 2405 2404 2404 2404 2404 2404 2403 2403 2403 2403 2403 2403 2403 2403 2403 2403 2403 2405 2408 2403 .85 .39 .94 .51 .45 .47 .21 .83 .68 .09 .85 .84 .91 .65 .31 .97 .55 .19 .15 .19 .99 .69 .35 .11 .11 .15 .18 .21 .26 .30 .35 .22 .85 .11 2403. 2404. 2404. 2404. 2405. 2405. 2405. 2405. 2405. 2406. 2405. 2405. 2405. 2405. 2405. 2406. 2406. 2406. 2406. 2405. 2405. 2405. 2405. 2405. 2405. 2405. 2405. 2405. 2405. 2405.- 2405. 2406. 2403. 82 20 30 37 24 81 94 94 98 04 91 67 39 16 94 15 30 25 05 83 59 45 51 74 73 73 79 83 69 47 -- 56 30 82 2405 2405 2405 2405 2405 2405 2405 2405 2405 2405 2405 2404 2404 2405 2405 2404 2405 2405 2404 2404 2404 2404 2404 2404 2404 2404 2404 2404 2404 2404 2404 2404 2405 2404 .48 .38 .30 .33 .30 .22 .28 .35 .30 .16 .04 .96 .90 .00 .09 .94 .02 .00 .86 .62 .33 .27 .21 .15 .23 .20 .26 .33 .38 .32 .24 .82 .48 .15 2404 2404 2403 2404 2404 2403 2403 2403 2403 2403 2403 2403 2404 2404 2404 2404 2404 2404 2404 2404 2404 2404 2404 2404 2404 2404 2404 2404 2405 2405 2405 2404 2405 2403 .17 .08 .98 .00 .04 .77 .54 .42 .34 .24 .28 .32 .04 .26 .20 .10 .12 .16 .20 .19 . 11 .34 .37 .43 .49 .54 .50 .60 .08 .33 .42 .15 .42 .24 2405.66 2405.85 2406.22 2406.50 2406.59 2407.36 2407.98 2408.04 2409.55 2411.21 2411.48 2411.69 2412.21 2412.33 2412.30 2412.15 2411.92 2411.93 2411.98 2411.98 2411.69 2411.56 2412.23 2412.36 2412.15 2411.80 2411.40 2411.38 2411.60 2412.16 2410.44 2412.36 2405.66 WTR YR 1990 TOTAL 878792.65 MEAN 2407.65 MAX 2413.36 MIN 2403.11 RIO GRANDK DE MANATI BASIN 50034000 RIO BAUTA NEAR OROCOVIS, PR 101 LOCATION.--Lat 18°14'10", long 66°27'18", Hydrologic Unit 21010001, on left bank, at bridge on Highway 157 (12.1 km), and 4.2 mi (6.8 km) west of Orocovis. DRAINAGE AREA.--16.7 mi' (43.3 km 1 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--February 1959 to April 1966 (annual low-flow measurements only), February to September 1969 (occasional measurements only), October 1969 to September 1982, October 1988 to current year. GAGE.--Water-stage recorder and crest-stage gage. Datum of gage is 772.82 ft (235.556 m) above mean sea level. REMARKS.--Records fair except those for estimated daily discharges, which are poor. Gage-height and precipitation satellite telemetry at station. AVERAGE DISCHARGE.--14 years (1971-82,1989-90), 36.4 ft3 /s (1.031 m'/s) 29.60 in/yr (752 mm/yr), 26,370 acre-ft/yr (32.5 hm'/yr); median of yearly mean discharges, 27 ft'/s (0.76 m3 /s), 19,600 acre-ft/yr (24 hmVyr) . EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 17,800 ft'/s (504 m'/s), Oct. 9, 1970, gage height, 21.9 ft (6.68 m), from floodmark, from rating curve extended above 100 ft'/s (2.83 m'/s) on basis of step-backwater analysis by U.S. Bureau of Reclamation; minimum discharge 2.8 ft'/s (0.079 m'/s), July 23, 1977. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,500 ft'/s (42.5 m3 /s) and maximum (*): Discharge (ft'/s) (m'/s) Gage height (ft) (m) Date Time Oct. 23 1900 *1,560 44.2 *11.38 3.469 Minimum discharge, 3.4 ft'/s (0.096 m3 /s), Aug. 22. Date Sept. 13 Time 1750 Discharge (ft'/s) (m'/s) 1,550 43.9 DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES Gage height (ft) (m) 11.37 3.466 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC-FT CFSM IN. OCT 158 280 214 88 63 50 40 116 80 47 36 31 29 52 62 82 152 e!20 72 e200 e310 e260 e590 e210 125 212 191 186 242 154 97 4549 147 590 29 9020 8.79 10.13 NOV 81 66 55 50 48 49 45 42 40 41 38 35 35 34 31 29 28 27 26 26 25 24 24 23 23 22 22 21 20 20 1050 35.0 81 20 2080 2.10 2.34 20 19 19 18 18 17 18 17 16 16 16 15 15 15 14 14 14 14 14 14 13 13 13 13 13 12 12 12 13 12 12 461 14.9 20 12 914 .89 1.03 JAN 16 16 13 12 11 11 11 11 11 11 11 11 10 10 10 9.9 10 9.7 10 10 9.9 9.6 9.4 10 9.6 9.4 9.7 10 9.2 9.0 8.8 329.2 10.6 16 8.8 653 .64 .73 FEB 8.4 7.9 7.9 7 .9 7.9 7.5 8.5 11 9.1 10 8.3 8.7 9.1 19 12 9.4 8.6 8.6 8.9 8.1 8.4 9.9 9.5 8.5 8.5 11 8.6 7 .9 259.1 9.25 19 7.5 514 .55 .58 MAR 8.2 7.9 7.3 7. 1 7.0 6.8 7.0 6.8 8.9 10 9.6 25 41 53 25 18 16 13 11 10 9.9 9.4 9.4 9.2 9. 0 9. 1 9.0 8.6 8.9 8.8 8.6 398.5 12.9 53 6.8 790 .77 .89 APR 8.4 8.3 8.3 8.0 7.9 7.9 7.9 7.7 7.5 7.5 7.5 7.2 7 .8 9.4 8.5 7.9 12 25 25 35 19 13 11 10 10 12 10 9.5 9.0 9.0 337.2 11.2 35 7.2 669 .67 .75 CAL YR 1989 WTR YR 1990 TOTAL 13624.4 MEAN 37.3 TOTAL 9870.4 MEAN 27.0 MAX 961 MAX 590 MIN 6.1 MIN 3.6 AC-FT 27020 AC-FT 19580 MAY 9.0 9.0 8.8 9.0 9.2 8.5 e8.3 e!6 e!2 e!5 24 18 12 10 9.7 9.0 8.7 8.3 8.0 7.6 7.5 7.1 6.9 6.8 6.5 6.5 6.2 6.3 6.6 6.0 5.8 292.3 9.43 24 5.8 580 .56 .65 CFSM 2.24 CFSM 1.62 JUN 5.7 6.4 5.7 5.5 7.7 8.5 6.0 5.4 5.2 4.9 4.9 4.8 4.7 5.4 35 16 8.6 7.1 6.4 5.9 5.8 5.6 6.1 10 10 6.9 6.0 5.5 5.2 5.2 JUL 5.0 4.9 4.6 .6 .5 .7 .6 .5 4.4 4.4 4.4 4.1 4.5 6.1 5.6 6.1 8.7 8.9 9.0 5.5 4.5 4.2 4.3 7. 1 7.9 5.7 5.7 5.7 4.5 4.0 3.9 226.1 7.54 35 4.7 448 .45 .50 IN. 30.35 IN. 21.99 166. 6 5.37 9.0 3.9 330 .32 .37 AUG 4.0 4.0 4.1 3.9 3.9 4.0 4.0 3.9 3.8 4.3 4.7 3.9 66 28 7.8 5.2 4.3 4.1 3.9 3.7 3.6 6.8 7.1 6.2 4.7 4.1 3.9 6.1 60 26 6.7 306.7 9.89 66 3.6 608 .59 .68 SEP 4.7 4.3 4.6 6.4 4.5 51 30 15 95 66 16 20 194 102 104 55 20 11 7.9 5.9 5.0 4.4 61 155 194 101 40 24 18 75 1494.7 49.8 194 4.3 2960 2.98 3.33 e Estimated 102 RIO GRANDE DE MANATI BASIN 50034000 RIO BAUTA NEAR OROCOVIS, PR--Continued WATER QUALITY RECORDS PERIOD OP RECORD.--OCTOBER 1988 TO CURRENT YEAR SPECIFIC CON- TEMPERA- DUCTANCE TURE (UHHOS) (DEC C) DATE TIME OCT. 05 1608 NOV. 02 1157 DEC. 14 1507 JAN. 02 1346 FEB. 05 1240 MAR. 05 1037 STREAMFLOW, INSTANTANEOUS (CFS) 57.8 97 14.5 14.4 7.4 6.8 99 184 195 185 185 200 24.0 25.0 26.0 23.0 23.0 21.0 DATE TIME APR. 02 1343 MAY 07 1137 JUNE 14 1252 JULY 10 1146 AUG. 07 1314 STREAMFLOW, INSTANTANEOUS (CFS) 8.5 8.7 5.2 4.2 4.0 SPECIFIC CON- TEMPERA- DUCTANCE TURE (UMHOS) (DEC C) SEPT 05 1125 4.3 245 265 210 202 210 210 22.0 23.0 23.0 23.0 23.0 22.0 RIO GRANDE DE MANATI BASIN 50035000 RIO GRANDE DE MANATI AT CIALES, PR 103 LOCATION.--Lat 18°19'26 M , long 66°27'36", Hydrologic Unit 21010001, on left bank, 1.6 mi (2.6 km) upstream from Hwy 145 bridge, 0.8 mi (1.3 km) downstream from Quebrada Saliente, 0.9 mi (1.4 km) upstream from Quebrada Cojo Vales, and 1.2 mi (1.9 km) southeast of Ciales. DRAINAGE AREA.--128 mi a (332 km"), excludes 6.0 mi ! El Guineo and de Matrullas reservoirs. (15.5 km a ), the runoff from which is diverted through WATER-DISCHARGE RECORDS PERIOD OP RECORD.--September 1946 to September 1953, May 1956 to December 1957 (unpublished, available in files of Caribbean District Office and in the National Water Data Storage and Retrieval System, Washington, D.C.); February 1959 to September 1960 (monthly discharge measurements only); October 1960 to current year. Equivalent record from January 1971 to December 1972 published as 50035200 Rio Grande de Manati at Highway 145 at Ciales at site 1.6 mi (2.6 km) downstream, drainage area 132 mi 3 (342 km 1 ). GAGE.--Water-stage recorder. Elevation of gage is 140 ft (43 m), from topographic map. Prior to Apr. 1, 1962 , staff gage, read twice daily, at site 100 ft (30 m) upstream at same datum. January 1971 to December 1972 at site 1.6 mi (2.6 km) downstream at different datum. REMARKS.--Records fair except those for estimated daily dischages, which are poor, satellite telemetry at station. Gage-height and precipitation AVERAGE DISCHARGE.--30 years (1961-90), 258 ft'/s (7.306 m3 /s) , 27.37 in/yr (695 mm/yr), 186,900 acre-ft/yr (230 hmVyr); median of yearly mean discharges, 228 ft3 /s (6.46 m'/s), 165,000 acre-ft/yr (203 hmVyr) . EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 125,000 ft3 /s (3,540 m'/s) , Oct. 9, 1970, gage height, 24.0 ft (7.32 m), from floodmark, from rating curve extended above 3,000 ft3 /s (85.0 m3/s) on basis of slope-area measurements of peak flow at gage heights 13.2 ft (4.02 m), 15.0 ft (4.57 m), 19.0 ft (5.79 m), and 24.0 ft (7.32 m), datum then in use; minimum discharge, 20 ft3 /s (0.566 mVs), Apr. 20, 21, 1984. EXTREMES OUTSIDE PERIOD OF RECORD.--Approximate gage heights of major floods, pointed out by local residents are as follows: August 1899, 50 ft (15 m) , September 1928, 36 ft (11 m), and September 1932, 34 ft (10 m) at site 1.6 mi (2.6 km) upstream. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 7,000 ft3 /s (198 m'/s) and maximum (*): Oct. 21 Oct. 22 Time 1655 1755 Discharge (ft3 /s) (mVs) 8,420 8,420 238 238 Gage height (ft) (m) 7.19 7. 19 Date Oct. 23 Time 1855 Discharge (ft 3/s) (mV *14,400 408 Minimum discharge, 35 ft3 /s (0.991 m3 /s), July 31, Aug. 1. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES Gage height (ft) (m) *9.20 2.804 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 OCT 653 903 1070 572 582 413 219 369 511 221 167 145 132 139 324 NOV 376 304 272 247 253 286 282 297 336 262 256 219 e210 e200 e!90 DEC 122 121 120 116 117 120 117 113 111 110 112 112 103 93 92 JAN 128 118 92 86 86 85 e85 e83 e81 77 77 77 74 79 80 FEB 68 69 69 68 66 59 52 73 71 71 58 51 50 143 108 64 64 55 52 52 52 51 51 63 100 153 673 914 1120 392 APR 76 73 72 69 69 69 68 68 58 58 54 52 58 73 56 MAY 96 101 84 80 75 67 67 178 394 283 296 164 107 100 112 JUN 64 98 79 74 172 192 81 60 61 62 56 54 52 50 310 49 48 47 42 45 47 46 46 45 43 43 41 40 45 53 36 38 46 44 39 50 49 56 47 45 66 56 199 353 94 SEP 181 138 334 299 221 237 323 180 872 611 177 171 889 1030 593 16 17 18 19 20 21 22 23 24 25 345 627 555 712 983 2030 2500 3740 1690 850 e!80 e!80 155 150 152 148 149 145 136 136 93 90 85 85 83 81 80 79 79 78 72 77 72 76 84 81 71 69 81 75 67 60 54 70 64 58 73 81 67 58 450 358 174 129 108 109 102 99 97 96 52 312 711 563 474 246 147 110 90 92 91 80 73 68 68 70 71 65 60 63 185 96 80 68 60 56 53 54 83 112 77 60 151 84 64 52 47 46 46 58 64 54 51 48 43 40 50 142 85 65 413 222 153 124 100 97 91 172 640 659 26 27 28 29 30 31 1020 958 573 1010 740 423 135 132 127 123 124 78 79 89 125 106 86 72 74 80 74 68 63 78 73 63 98 96 84 85 82 80 160 118 93 81 77 60 59 57 59 63 66 75 59 53 51 50 58 56 53 50 43 38 55 49 46 155 227 93 466 196 137 118 237 TOTAL MEAN MAX MIN AC-FT CFSM IN. 25176 812 3740 132 49940 6.34 7.32 CAL YR 1989 WTR YR 1990 6162 205 376 123 12220 1.60 1.79 TOTAL 76720 TOTAL 69360 3075 99.2 125 78 6100 .77 .89 2497 80.5 128 63 4950 .63 .73 1942 69.4 143 50 3850 .54 .56 6103 197 1120 51 12110 1.54 1.77 4299 143 711 52 8530 1.12 1.25 MEAN 210 MAX 7110 MIN 47 AC-FT 152200 MEAN 190 MAX 3740 MIN 36 AC-FT 137600 3277 106 394 57 6500 .83 .95 CFSM 1.64 CFSM 1.48 2600 86.7 310 50 5160 .68 .76 IN. 22.30 IN. 20.16 1663 53.6 151 38 3300 .42 .48 2485 80.2 353 36 4930 .63 .72 10081 336 1030 91 20000 2.63 2.93 104 RIO GRANDE DE MANATI BASIN 50035000 RIO GRANDE DE MANATI AT CIALES, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS 1979 TO CURRENT YEAR STREAMFLOW, DATE TIME INSTANTANEOUS (CFS) SPECIFIC CON- TEMPERA- DDCTANCE TURE (DMHOS) (DEG C) OCT. NOV. DEC. JAN. FEB. 03 1332 01 0840 13 1109 03 0956 06 1142 MAR. 06 0812 1.139 402 215 90.3 56.2 54.3 111 182 187 216 202 230 26.0 25.0 27.0 22.0 25.0 24.0 DATE TIME APR. 04 0834 HAY 08 1100 JUNE 13 1123 JULY 11 0954 AUG. 08 0914 SEPT 06 1046 STREAMFLOW, INSTANTANEOUS (CFS) 73.3 110 54.3 44 60 193 SPECIFIC CON- TEMPERA- DUCTANCE TURE (UHHOS) (DEG C) 255 252 220 230 238 190 24.0 23.0 23.0 25.0 23.0 23.0 RIO GRANDE DE MANATI BASIN 105 50035500 RIO GRANDE DE MANATI AT HIGHWAY 149 AT CIALES, RP WATER-QUALITY RECORDS LOCATION.--Lat 18°20'46", long 66°28'06', at bridge on Highway 149, about 800 ft (244 m) upstream from confluence with Rio Cialitos, 0.5 mi (0.8 km) north of Ciales plaza. DRAINAGE AREA.--136 mi 1 (352 km1 ) this excludes the 6 mi 1 (15.5 km1 ) upstream from Lago El Guineo and Lago de Matrullas, flow from which is diverted to Rio Jacaguas. PERIOD OP RECORD.—Water years 1979 to current year. DATE OCT 1989 17... DEC 01. .. FBB 1990 15. .. APR 23. .. JUN 11. .. AUG 15. .. TIME 1045 0900 0805 0900 0840 0830 DIS- CHARGE, INST. CUBIC FEET PER SECOND 300 115 182 125 63 90 SPE- CIFIC CON- DUCT- ANCE (US /CM) 190 260 249 235 248 223 PH (STAND- ARD UNITS) 7.60 7.70 7.40 7.90 7.80 7.70 TEMPER- ATURE WATER (DEG C) 23.5 23.0 22.0 24.0 29.0 27.5 TUR- BID- ITY (NTU) 69 1.2 4.5 15 6.2 29 OXYGEN, DIS- SOLVED (MG/L) 8.3 7.4 7.9 7.0 6.9 6.6 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 97 86 90 82 89 82 OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 22 <10 12 17 19 25 COLI- FORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) 2200 K60 470 440 K40 2200 STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) K9000 K40 1400 290 K80 K1300 OCT 1989 17. .. DEC 01. .. FBB 1990 15. .. APR 23. .. JUN 11. . . AUG 15. . . HARD- HARD- NESS NESS NONCARB CALCIUM TOTAL WH WAT DIS- (MG/L TOT FLD SOLVED AS MG/L AS (MG/L CAC03) CAC03 67 0 17 77 7 19 85 8 22 MAGNE- SIUM, SODIUM, DIS- DIS- SOLVED SOLVED (MG/L (MG/L AS CA) AS HG) AS NA) 6.0 9.7 7.2 10 7.4 12 SODIUM AD- SORP- TION RATIO ALKA- POTAS- LINITY CHLO- SIUM, WAT WH SULFATE RIDE, DIS- TOT FET SULFIDE DIS- DIS- SOLVED FIELD TOTAL SOLVED SOLVED (MG/L MG/L AS (MG/L (MG/L (MG/L AS K) 0.5 1.9 0.5 2.0 0.6 2.1 CAC03 65 100 93 79 98 77 AS S) AS SO4) AS CL) (.5 8.0 10 1.5 11 11 7.5 15 DATE OCT 1989 17... DEC 01.. . FBB 1990 15.. . APR 23.. . JUN 11.. . AUG 15.. . FLUO- RIDB, DIS- SOLVED (MG/L AS F) 0.10 -- -- 0.10 -- <0.10 SILICA, DIS- SOLVED (MG/L AS SIO2) 24 -- — 23 -- 23 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 116 -- -- 130 -- 135 SOLIDS, DIS- SOLVED (TONS PER DAY) 93.7 -- -- 43.9 -- 32.8 RESIDUE TOTAL AT 105 DEG. C, SUS- PENDED (MG/L) 66 7 13 49 21 12 NITRO- GEN, NITRATE TOTAL (MG/L AS N) 0.77 0.49 0.48 0.69 0.78 0.29 NITRO- GEN, NITRITE TOTAL (MG/L AS N) 0.03 0.01 0.02 0.01 0.02 0.01 NITRO- GEN, NO2+NO3 TOTAL (MG/L AS N) 0.80 0.50 0.50 0.70 0.80 0.30 NITRO- GEN, AMMONIA TOTAL (MG/L AS N) 0.03 0.02 0.02 0.07 0.06 0.03 NITRO- GEN, ORGANIC TOTAL (MG/L AS N) 0.47 0.28 — 0.53 0.34 0.57 K = non-ideal count 106 RIO GRANDE DE MANATI BASIN 50035500 RIO GRANDE DE MANATI AT HIGHWAY 149 AT CIALES, PR—Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 17.. . DEC 01.. . FEB 1990 15.. . APR 23.. . JUN 11. .. ADG 15.. . DATE OCT 1989 17... DEC 01.. . FEB 1990 15. .. APR 23. .. JUN 11. . . AUG 15. .. NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.5 0.3 <0.2 0.6 0.4 0.6 IRON, TOTAL RECOV- ERABLE (UG/L AS FE) 5100 -- -- 3800 -- -- NITRO- GEN, TOTAL (MG/L AS N) 1.3 0.8 — 1.3 1.2 0.7 LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) 14 -- -- <1 — -- NITRO- GEN, TOTAL (MG/L AS N03) 5.1 3.5 -- 5.8 5.3 2.9 MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) 120 -- -- 100 -_ -- PHOS- PHORUS ARSENIC TOTAL TOTAL (MG/L (UG/L AS P) AS AS) 0.13 <1 0.04 0.08 0.08 <1 0.10 0.16 MERCURY TOTAL SELB- RECOV- NIUM, ERABLE TOTAL (UG/L (UG/L AS HG) AS SE) <0.10 <1 __ -_ <0.10 <1 __ __ BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 -- -_ 100 — -- SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) <1 — __ <1 __ -_ BORON, TOTAL RECOV- ERABLE (UG/L AS B) <10 __ -- <10 -- -- ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) 10 __ __ 10 __ -- CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 — — <1 -- ~~ CYANIDE TOTAL (MG/L AS CN) <0.010 __ __ <0.010 — — CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) 5 _- -- 22 -- ~~ PHENOLS TOTAL (UG/L) 3 __ __ <1 __ -- COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) 20 -- -- 10 -- -- METHY- LENE BLUE ACTIVE SUB- STANCE (MG/L) 0.06 __ __ 0.02 __ -- RIO GRANDB DB MAKATI BASIN 50035950 RIO CIALITOS AT HIGHWAY 649 AT CIALES, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°20'18", long 66°28'28", 100 ft (30 m) upstream from bridge on Highway 649, upstream from mouth, and about 0.4 mi (0.6 km) west of Ciales plaza. DRAINAGE AREA.--17.0 mi» (44.0 km 3 ). PERIOD OP RECORD.--Water years 1969-71, 1974 to current year. 107 0.7 mi (1.1 km) DATE OCT 1989 17. .. DEC 01. .. FBB 1990 15. .. APR 23. .. JUN 11... AUG 15. .. TIME 0920 1015 0935 1000 1005 0945 DIS- CHARGE, INST. CUBIC FEET PER SECOND 45 24 17 12 8.8 13 SPE- CIFIC CON- DUCT- ANCE (US/CM) 158 232 202 257 247 175 PH (STAND- ARD UNITS) 7.60 8.00 7.50 8.00 7.90 7.90 TEMPER- ATURE WATER (DBG C) 22.5 21.0 20.5 22.5 26.5 25.0 TUR- BID- ITY (NTU) 26 1.0 5.5 7.2 2.9 14 OXYGEN, DIS- SOLVED (MG/L) 8.4 8.3 8.7 7.7 8.3 7.7 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 96 92 96 88 101 91 OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 46 <10 17 <10 19 20 COLI- FORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) 21000 380 K1100 K930 K880 K1900 STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) 44000 720 K1900 440 670 4400 OCT 1989 17. .. DEC 01. .. FBB 1990 15. .. APR 23. .. JUN 11. .. AUG 15. .. HARD- HARD- NESS NESS NONCARB CALCIUM TOTAL WH WAT DIS- (MG/L TOT FLD SOLVED AS MG/L AS (MG/L CACO3) CACO3 58 2 16 88 6 26 70 13 20 MAGNE- SIUM, SODIUM, DIS- DIS- SOLVED SOLVED (MG/L (MG/L AS CA) AS MG) AS NA) SODIUM AD- SORP- TION RATIO ALKA- POTAS- UNITY SIUM, WAT WH DIS- TOT FET SULFIDE SOLVED FIELD TOTAL (MG/L MG/L AS (MG/L AS K) 4.3 8.9 0.5 1.9 5.7 9.9 0.5 1.7 4.9 8.5 0.4 1.9 CACO3 53 92 77 95 100 57 CHLO- SULFATB RIDE, DIS- DIS- SOLVED SOLVED (MG/L (MG/L AS S) AS SO4) AS CL) <0.5 7.0 8.5 <0.5 9.2 9.2 5.5 12 DATE OCT 1989 17... DEC 01.. . FEB 1990 15.. . APR 23.. . JUN 11.. . AUG 15... FLUO- RIDB, DIS- SOLVED (MG/L AS F) 0.10 -- -- 0.10 -- 0.10 SILICA, DIS- SOLVED (MG/L AS SIO2) 21 — -- 25 — 22 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 99 __ -- 140 __ 109 RESIDUE SOLIDS, TOTAL NITRO- NITRO- NITRO- DIS- AT 105 GEN, GEN, GEN, SOLVED DBG. C, NITRATE NITRITE NO2+NO3 (TONS SUS- TOTAL TOTAL TOTAL PER PENDBD (MG/L (MG/L (MG/L DAY) (MG/L) AS N) AS N) AS N) 12.0 4.69 3.83 30 20 12 17 0.95 0.89 1.17 0.79 1.00 1.48 0.05 0.01 0.03 0.01 0.10 0.02 1.00 0.90 1.20 0.80 1.10 1.50 NITRO- GEN, AMMONIA TOTAL (MG/L AS N) 0.06 0.01 0.04 0.05 0.05 0.01 NITRO- GEN, ORGANIC TOTAL (MG/L AS N) 0.34 — 0.66 0.45 0.25 0.39 K = non-ideal count 108 RIO GRANDE DE MANATI BASIN 50035950 RIO CIALITOS AT HIGHWAY 649 AT CIALES, PR—Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 17.. . DEC 01.. . FEE 1990 15.. . APR 23.. . JUN 11.. . AUG 15... DATE OCT 1989 17... DEC 01.. . FEE 1990 15.. . APR 23... JUN 11.. . AUG 15.. . NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.4 <0.2 0.7 0.5 0.3 0.4 IRON, TOTAL RECOV- ERABLE (UG/L AS FE) 24000 -- -- 720 -- -- NITRO- GEN, TOTAL (MG/L AS N) 1.4 — 1.9 1.3 1.4 1.9 LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) 6 — — <1 -- -- NITRO- GEN, TOTAL (MG/L AS N03) 6.2 -- 8.4 5.8 6.2 8.4 MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) 300 -- -- 40 -- -- PHOS- PHORUS TOTAL (MG/L AS P) 0.10 0.07 0.10 0.08 0.06 0.12 MERCURY TOTAL RECOV- ERABLE (UG/L AS HG) <0.10 — — <0.10 — — BARIUM, TOTAL ARSENIC RECOV- TOTAL BRABLE (UG/L (UG/L AS AS) AS BA) <1 <100 __ __ 1 100 __ -- — SILVER, SBLB- TOTAL NIUM, RECOV- TOTAL BRABLE (UG/L (UG/L AS SE) AS AG) <1 <1 __ __ <1 <1 __ __ BORON, TOTAL RECOV- ERABLE (UG/L AS B) <10 -- -- 20 -- -- ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) 30 -- -- 10 -- -- CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 — — <1 — -- CYANIDE TOTAL (MG/L AS CN) <0.010 — — <0.010 — — CHRO- MIUM, COPPER, TOTAL TOTAL RECOV- RECOV- ERABLE BRABLE (UG/L (UG/L AS CR) AS CU) 35 40 __ __ 11 <40 __ — — — — MBTHY- LENB BLUE ACTIVE PHENOLS SUB- TOTAL STANCE (UG/L) (MG/L) 1 0.09 __ __ 1 0.02 __ __ RIO GRANDE DE MANATI BASIN 50038100 RIO GRANDE DE MANATI AT HIGHWAY 2 NEAR MANATI, PR 109 LOCATION.--Lat 18°25'52", long 66°31'37", Hydrologic Unit 21010002, at bridge on Highway 2, and 2.3 mi (3.7 km) west of Manati. DRAINAGE AREA.--197 mi» (510 km')/ approximately, of which about 38 mi 1 (98 km») is partly or entirely noncontributing, excludes 6.0 mi 3 (15.5 km1 ) upstream from Lago El Guineo and Lago de Matrullas. WATER-DISCHARGE RECORDS PERIOD OF RECORD.--1963-68 (annual maximum discharge only), February 1970 to current year. REVISED RECORDS.--WRD PR-86-1: 1970-71 (M), 1975, 1979, 1982-85 (P). GAGE.—Water-stage recorder. Elevation of gage is 14 ft (4 m), from topographic map. Prior to 1968 crest-stage gage at same site and datum 3.57 ft (1.088 m) lower. REMARKS.--Records fair except those for estimated daily discharges, which are poor. Gage-height and precipitation satellite telemetry at station. AVERAGE DISCHARGE.--20 years (1971-90), 383 ftVs (10.85 m3 /s), 26.40 in/yr (670 mm/yr), 277,500 acre-ft/yr (342 hrnVyr); median of yearly mean discharges, 348 ftVs (9.86 m3 /s), 252,000 acre-ft/yr (311 hm3 /yr) . EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 97,200 ft3 /s (2,750 m'/s), Oct. 7, 1985, gage height, 33.79 ft (10.299 m) from rating curve extended above 15,000 ft3 /s (425 m3/s) on basis of slope-area measurements of peak flow; minimum discharge, 33 ft'/s (0.935 m3 /s), May 12, 1984. EXTREMES OUTSIDE PERIOD OF RECORD.--Approximate gage heights to gage datum of major floods, pointed out by local residents, are as follows: Sept. 13, 1928, 36.6 ft (11.16 m), Sept. 27, 1932, 36.3 ft (11.06 m), and Aug. 4, 1945, 34.3 ft (10.45 m) . EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 9,000 ft3 /s (255 m3 /s) and maximum (*): Discharge Gage height Time (ftVs) (m3 /s) (ft) (m) Oct. 21 Oct. 22 2220 13,400 379 2255 13,000 368 28.62 8.723 28.55 8.702 Date Oct. 23 Discharge Time (ft'/s) (m3/s) 2320 *30,800 872 Gage height (ft) (m) *30.89 9.415 Minimum discharge, 62 ft 3 /s (1.76 rnVs), July 31, Aug. 1,2. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES DAY NOV APR MAY JUN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC- FT CFSM IN. CAL YR WTR YR 1140 504 2010 697 649 600 301 246 784 288 209 173 154 148 241 379 617 919 691 1090 3510 4760 6460 7510 1120 1270 1500 702 1070 e!290 e597 41629 1343 7510 148 82570 6.82 7.86 1989 1990 e493 e408 e349 e314 e307 e373 e363 e308 e499 e368 e362 e311 e281 e292 e280 e250 e234 e232 e224 e220 e222 e207 e204 e!99 e!97 e!97 e!95 e!94 e!90 e!88 --- 8461 282 499 188 16780 1.43 1.60 TOTAL 126430 TOTAL 107631 e!90 e!89 e!89 e!82 173 173 169 164 159 159 155 150 149 147 143 142 143 137 138 136 128 124 121 121 117 118 117 115 134 167 129 4578 148 190 115 9080 .75 .86 MEAN MEAN 174 157 140 128 119 116 115 118 115 113 116 119 117 108 127 113 112 114 116 122 132 118 113 121 121 110 112 117 112 104 97 3716 120 174 97 7370 .61 .70 346 MAX 295 MAX 93 93 91 92 92 90 87 101 125 118 112 97 93 134 241 137 127 109 120 123 107 114 133 128 113 103 130 110 --_ ___ 3213 115 241 87 6370 .58 .61 13900 MIN 7510 MIN 111 117 102 94 92 89 87 87 109 170 196 1030 1290 1710 822 870 1110 446 304 239 204 178 166 156 150 145 145 138 132 128 127 10744 347 1710 87 21310 1.76 2.03 51 AC- FT 62 AC- FT 123 119 118 119 115 111 109 108 106 102 101 98 97 119 113 104 107 786 1030 570 448 269 203 168 153 196 e!90 e!55 143 136 --- 6316 211 1030 97 12530 1.07 1.19 250800 213500 140 164 151 148 152 152 152 187 474 e380 e350 e!77 e!67 e!61 e!55 141 133 127 121 116 112 108 104 102 100 97 98 100 95 94 94 4852 157 474 94 9620 .79 .92 CFSM 1.76 CFSM 1.50 92 105 113 102 105 295 145 111 101 99 93 95 91 88 332 380 184 171 137 118 106 100 97 108 156 137 111 100 93 93 --- 4058 135 380 88 8050 .69 .77 IN. 23 IN. 20 93 93 90 87 87 89 89 89 88 89 82 83 82 81 88 89 99 127 131 96 78 71 69 70 75 82 76 71 71 68 65 2648 85.4 131 65 5250 .43 .50 .87 .32 62 64 66 71 68 67 74 79 77 72 74 93 78 619 204 131 109 102 98 93 90 92 147 175 126 109 101 95 141 231 283 3891 126 619 62 7720 .64 .73 242 221 219 560 304 514 432 383 489 1810 410 251 402 1740 893 562 323 228 183 157 140 130 122 389 974 643 285 192 160 167 --- 13525 451 1810 122 26830 2.29 2.55 e Estimated 110 RIO GRANDE DE RANATI BASIN 50038100 RIO GRANDE DE MANATI AT HIGHWAY 2 NEAR MANATI, PR—Continued (National stream-quality accounting network station) WATER-QUALITY RECORDS PERIOD OP RECORD.--Water years 1969 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 03. .. DEC 01. .. FEB 1990 01. .. MAR 30. .. JUN 01. . . AUG 02. .. DATE OCT 1989 03. .. DEC 01. . . PEB 1990 01. .. MAR 30. .. JUN 01. .. AUG 02. . . DATE OCT 1989 03. .. DEC 01. . . FEB 1990 01. . . MAR 30. . . JUN 01. .. AUG 02. .. TIME 1230 0945 0945 1200 1230 1130 HARD- NESS NONCARB WH WAT TOT PLD MG/L AS CACO3 0 -- 0 -- 9 0 SOLIDS, RESIDUE AT 180 DBG. C DIS- SOLVED (MG/L) 123 147 193 196 184 183 DIS- CHARGE, INST. CUBIC PEET PER SECOND 1790 190 93 127 90 62 CALCIUM DIS- SOLVED (MG/L AS CA) 16 38 44 43 42 45 SOLIDS, SUM OP CONSTI- TUENTS, DIS- SOLVED (MG/L) 98 171 190 195 186 192 SPE- CIFIC CON- DUCT- ANCE (US /CM) 143 296 313 320 268 299 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 4.4 8.0 8.7 8.4 8.2 8. 1 SOLIDS, DIS- SOLVED (TONS PER DAY) 594 87.9 48.5 68. 1 44.9 30. 6 PH (STAND- ARD UNITS) 7.40 7.60 7.80 7.70 8.00 7.80 SODIUM, DIS- SOLVED (MG/L AS NA) 7.3 11 12 12 12 12 NITRO- GEN, NO2+NO3 DIS- SOLVED (MG/L AS N) 0.66 0.71 0.20 0.60 0.40 0. 10 TEMPER- ATURE WATER (DBG C) 24.0 24.0 24.5 25.0 29.5 29.0 SODIUM AD- SORP- TION RATIO 0.4 0.4 0.4 0.4 0.4 0.4 NITRO- GEN, AMMONIA DIS- SOLVED (MG/L AS N) 0.03 0.03 0.09 0.02 0.02 0.05 TUR- BID- ITY (NTU) 240 4.5 3.1 8.0 3.0 1.0 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 2.3 2.0 1.6 2.0 2.0 1.2 NITRO- GEN, AMMONIA DIS- SOLVED (MG/L AS NH4) 0.04 0.04 0.12 0.03 0.03 0.06 OXYGEN, DIS- SOLVED (MG/L) 8.0 7.6 7.4 7.4 8.2 8.7 ALKA- LINITY WAT WH TOT FET PI ELD MG/L AS CACO3 52 120 140 140 130 140 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 1.3 0.30 0. 90 <0.20 0.40 0. 60 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 94 90 87 88 106 111 SULFATE DIS- SOLVED (MG/L AS SO4) 7.0 9.0 9.0 8.8 7.7 8.3 PHOS- PHORUS TOTAL (MG/L AS P) 0.44 0. 08 0.02 0.09 0. 11 0.03 COLI- PORM, PECAL, 0.7 UM-MP (COLS./ 100 ML) 25000 3600 K11000 2300 K9800 390 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 8.4 12 13 15 13 12 PHOS- PHORUS DIS- SOLVED (MG/L AS P) 0.07 0.06 0.02 0.05 0.10 0.04 STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) 47000 1000 4600 500 650 430 PLUO- RIDE, DIS- SOLVED (MG/L AS P) 0.10 0.10 0.10 <0.10 0.10 0.20 PHOS- PHORUS ORTHO, DIS- SOLVED (MG/L AS P) 0.06 0. 06 <0.01 0.05 0.08 0.02 HARD- NESS TOTAL (MG/L AS CAC03) 58 130 150 140 140 150 SILICA, DIS- SOLVED (MG/L AS SIO2) 18 16 17 21 21 20 PHOS- PHATE, ORTHO, DIS- SOLVED (MG/L AS PO4) 0.18 0.18 0.20 0.15 0.25 0.06 K = non-ideal count RIO GRANDE DE MANATI BASIN 50038100 RIO GRANDE DE MANATI AT HIGHWAY 2 NEAR MANATI, PR—Continued (National stream-quality accounting network station) WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 111 OCT 1989 03. .. DEC 01. . . FEE 1990 01. . . MAR 30. . . JUN 01. . . AUG 02... ALUM- INUM, DIS- SOLVED (UG/L AS AL) ARSENIC DIS- SOLVED (UG/L AS AS) BARIUM, DIS- SOLVED (UG/L AS BA) BERYL- LIUM, DIS- SOLVED (UG/L AS BE) CADMIUM DIS- SOLVED (UG/L AS CD) CHRO- MIUM, DIS- SOLVED (UG/L AS CR) COBALT, DIS- SOLVED (UG/L AS CO) COPPER, DIS- SOLVED (UG/L AS CU) IRON, DIS- SOLVED (UG/L AS FE) LEAD, DIS- SOLVED (UG/L AS PB) LITHIUM DIS- SOLVED (UG/L AS LI) 120 32 41 <0.5 <0.5 43 <0.5 36 <0.5 <5 <3 <3 <3 <3 <10 190 7 11 <4 <4 <4 <4 MANGA- MOLYB- DATE NESE, MERCURY DENUM, NICKEL, DIS- DIS- SOLVED SOLVED (UG/L (UG/L AS MM) AS HG) DIS- SOLVED (UG/L AS MO) DIS- SOLVED (UG/L AS NI) SELE- NIUM, DIS- SOLVED (UG/L AS SB) STRON- VANA- SILVER, DIS- SOLVED (UG/L AS AG) TIUM, DIS- SOLVED (UG/L AS SR) DIUM, DIS- SOLVED (UG/L AS V) ZINC, DIS- SOLVED (UG/L AS ZN) OCT 1989 03. . . DEC 01. . . FEE 1990 01. . . MAR 30. . . JUN 01. . . AUG 02. .. 33 34 24 0.1 87 220 210 230 <6 <6 13 PESTECIDE ANALYSES DATE JUN 1990 01.. . TIME 1230 PCB, TOTAL (UG/L) ALDRIN, TOTAL (UG/L) <0.010 CHLOR- DANE, TOTAL (UG/L) DDD, TOTAL (UG/L) DDE, TOTAL (UG/L) DOT, TOTAL (UG/L) DI- AZINON, TOTAL (UG/L) DI- ELDRIN TOTAL (UG/L) ENDO- SULFAN, TOTAL (UG/L) <0.010 <0.010 <0.010 <0.01 <0.010 <0.010 DATE JUN 1990 01. . . HEPTA- METH- METHYL METHYL HEPTA- CHLOR MALA- OXY- PARA- TRI- ENDRIN, ETHION, CHLOR, EPOXIDE LINDANE THION, CHLOR, THION, THION, MIREX, TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) <0.010 <0.01 <0.010 <0.010 <0.010 <0.01 <0.01 <0.01 <0.01 <0.01 DATE JUN 1990 01. . . PARA- THION, TOTAL (UG/L) NAPH- THA- LENES, POLY- CHLOR. TOTAL (UG/L) PER- THANE TOTAL (UG/L) TOX- APHENE, TOTAL (UG/L) TOTAL TRI- THION (UG/L) 2,4-D, TOTAL (UG/L) 2,4,5-T TOTAL (UG/L) 2, 4-DP TOTAL (UG/L) SILVEX, TOTAL (UG/L) <0.01 <0.10 <0.01 <0.01 <0.01 <0.01 <0.01 1 12 RIO GRANDB DB MANATI BASIN 50038100 RIO GRANDB DB MANATI AT HIGHWAY 2 NEAR MANATI, PR — Continued (National stream-quality accounting network station) WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT DATE MAR 1990 30.. . aim 01. . . AUG 02. . . TIME 1200 1230 1130 STREAM- FLOW, INSTAN- TANEOUS (CFS) 127 90 62 SEDI- MENT, SUS- PENDED (MG/L) 27 14 15 SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) 9.3 3.4 2.5 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .062 MM 85 81 29 LAGDNA TORTUGUERO BASIN 50038200 LACUNA TORTUGOERO OUTLET NEAR VEGA BAJA, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°28'29" / long 66°26'50", at bridge on Highway 686, 4.2 mi j (6.8 km') northeast of Manati, 4.4 mi 9 (7.1 km 2 ) northwest of Vega Baja plaza. DRAINAGE AREA.--Indeterminate. PERIOD OP RECORD.--Water years 1964-66, 1969-71, 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 113 and DATE OCT 1989 04... NOV 30. . . PEB 1990 08. . . APR 1.1 ... JDN 05.. . AUG 07. .. DATE OCT 1989 04. .. NOV 30. . . PEB 1990 08. . . APR 17 ... JUN 05. . . AUG 07. .. DATE OCT 1989 04. .. NOV 30. . . FEB 1990 08. . . APR 17.. . JUN 05. . . AUG 07. .. TIME 1545 0800 0830 1130 1100 0830 ALKA- LINITY WAT WH TOT PET PIELD MG/L AS CACO3 120 120 120 110 100 100 NITRO- GEN, TOTAL (MG/L AS NO3) 7.1 7.1 9.7 6.6 4.9 8.9 DIS- CHARGE, INST. CUBIC PEET PER SECOND 25 17 9.2 9.1 3. 0 8.7 SULPIDE TOTAL (MG/L AS S) <0.5 -- -- <0.5 -- - - PHOS- PHORUS TOTAL (MG/L AS P) 0.01 <0.01 0.03 0.02 0.01 <0.01 SPE- CIFIC CON- DUCT- ANCE (US/CM) 1440 1440 1400 1300 1500 1380 RESIDUE TOTAL AT 105 DBG. C, SUS- PENDED (MG/L) 3 9 13 5 1 1 BORON, TOTAL RECOV- ERABLE (UG/L AS B) 60 -- -- 80 -- -- PH (STAND- ARD UNITS) 8.10 8.20 8.00 8.20 7 .90 8.00 NITRO- GEN, NITRATE TOTAL (MG/L AS N) 0.58 0.58 0.78 0.59 0.19 0.29 COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) <10 -- -- <10 -- -- TEMPER- ATURE WATER (DEG C) 30.0 27. 0 25.0 28.5 29.5 29.5 NITRO- GEN, NITRITE TOTAL (MG/L AS N) 0.02 0.02 0.02 0.01 0.01 0. 01 IRON, TOTAL RECOV- ERABLE (UG/L AS FE) 140 -- -- 90 -- -- OXYGEN, DIS- SOLVED (MG/L) 6.7 7.4 5.9 6.1 6.2 6.0 NITRO- GEN, NO2+NO3 TOTAL (MG/L AS N) 0.60 0.60 0.80 0.60 0.20 0.30 MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MM) <10 -- -- 20 -- -- OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 88 93 70 77 80 77 NITRO- GEN, AMMONIA TOTAL (MG/L AS N) 0.28 0.26 0.15 0.14 0.15 0.18 ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) <10 -- -- 20 -- -- OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 30 26 46 41 37 42 NITRO- GEN, ORGANIC TOTAL (MG/L AS N) 0.72 0.74 1.2 0.76 0.75 1.5 CYANIDE TOTAL (MG/L AS CN) <0.01 -- -- <0.01 -- — COLI- PORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) K20 K70 K67000 K130 K80 K92 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 1.0 1.0 1.4 0.90 0.90 1.7 PHENOLS TOTAL (UG/L) 5 -- -- 7 -- -- STREP- TOCOCCI FECAL, KP AGAR (COLS. PER 100 ML) 30 40 900 K70 26 31 NITRO- GEN, TOTAL (MG/L AS N) 1.6 1.6 2 . 2 1.5 1. 1 2.0 METHY- LENE BLUE ACTIVE SUB- STANCE (MG/L) 0.14 -- -- 0.07 -- -- K = non-ideal count 1 14 THIS PAGE WAS LEFT BLANK INTENTIONALLY 115 O C E A N O ATLANTIC O Laffuat? Tortuguero MANATI Drainage boundaries indeterminate in limestone terrane . Droinoge boundary-^ J " Rl< CiALES EXPLANATION 038320 SURFACE-WATER STATION AND NUMBER QUALtTY-OF-WATER STATION AND NUMBER WELL AND WELL NUMBER 0 I t 3 4 MILES 0-2349 t KILOMETERS Figure 16.--Rio Cibuco basin, 116 RIO CIBDCO BASIN 50038320 RIO CIBDCO BELOW COROZAL, PR LOCATION.—Lat 18°21'13", long 66°20'07", Hydrologic Dnit 21010001, on right bank, 150 ft (46 m) downstream from Rio Corozal, and 1.4 mi (2.3 km) northwest of Corozal. DRAINAGE AREA.--15.1 mi a (39.1 km'). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--May 1969 to current year. GAGE.--Water-stage recorder. Elevation of gage is 195 ft (59 m), from topographic map. REMARKS.--Records fair. Gage-height and precipitation satellite telemetry at station. AVERAGE DISCHARGE.--21 years (1970-90), 29.4 ftVs (0.833 m3 /s) , 26.44 in/yr (672 mm/yr), 21,300 acre-ft/yr (26.3 hmVyr); median of yearly mean discharges, 32 ftVs (0.91 mVs), 23,200 acre-ft/yr (29 hmVyr) . EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 13,600 ftVs (385 m3/s), Nov. 7, 1979, gage height, 19.80 ft (6.035 m) , from rating curve extended above 100 ft3 /s (2.83 m?/s) on basis of float and slope-area measurements of peak flow; minimum daily discharge, 1.3 ft3 /s (0.037 mVs) / July 24-26, 1977. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 2,500 ft'/s (70.8 mVs) and maximum (*) : Discharge (ftVs) (mVs) Gage height (ft) (m) Date Time Oct. 2 1910 3,400 96.3 12.00 3.658 Minimum daily discharge, 6.7 ftVs (0.190 m3/s) , July 13. Date Mar. 16 Discharge Time (ftVs) (mVs) 1550 *6,770 192 Gage height (ft) (m) *15.47 4.715 DISCHARGE, CDBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES NOV JAN MAR JUN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC- FT CFSM IN. CAL YR WTR YR 22 184 200 69 151 60 38 30 27 24 23 21 20 21 19 18 51 24 45 27 23 167 174 71 66 47 36 31 52 32 26 1799 58.0 200 18 3570 3.84 4.43 1989 1990 65 31 26 24 41 36 35 77 35 24 21 20 19 21 18 17 16 16 16 15 15 15 15 15 17 17 18 17 15 16 733 24.4 77 15 1450 1.62 1.81 TOTAL 8153.5 TOTAL 8783.5 15 15 13 12 12 13 12 12 12 12 12 11 12 11 11 12 12 12 12 11 12 13 12 13 12 12 11 16 31 15 14 405 13.1 31 11 803 .87 1.00 MEAN MEAN 16 13 11 10 9.5 9.7 9.4 9.1 8.8 8.8 9.2 9.1 8.5 8.9 10 9.1 12 8.9 9.7 24 12 9.4 12 14 9.6 8.9 8.9 9.3 9.7 8.6 8.1 325.2 10.5 24 8.1 645 .69 .80 22.3 MAX 24.1 MAX 7.9 8.0 7.5 7.7 7.1 6.8 9.8 14 11 11 8.0 7.4 6.9 42 17 17 15 15 27 16 16 26 19 16 14 13 13 15___ ___ --- 394.1 14.1 42 6.8 782 .93 .97 781 MIN 399 MIN 22 15 13 11 11 9.9 11 11 26 18 214 252 313 203 56 399 76 42 30 26 22 21 19 18 18 21 18 16 16 15 14 1956.9 63.1 399 9.9 3880 4.18 4.82 4.0 AC-FT 6.7 AC-FT 13 13 13 12 12 11 11 12 11 11 10 10 12 14 11 11 29 21 28 45 19 16 14 13 37 34 17 13 12 11 --- 496 16.5 45 10 984 1.09 1.22 16170 17420 25 22 14 13 12 12 65 54 43 31 27 27 36 38 28 20 19 16 15 14 14 13 12 ~ 12 11 28 16 12 11 11 11 682 22.0 65 11 1350 1.46 1.68 CFSM 1.48 CFSM 1.59 11 12 12 13 12 11 10 10 11 10 10 10 9.2 20 52 17 14 14 13 12 11 11 11 9.5 9.1 8.4 8.0 8.3 8.9 8.7 377.1 12.6 52 8.0 748 .83 .93 IN. 20. IN. 21. 9.1 8.6 7.9 8.2 8.0 7.7 7.6 7.1 8.4 8.6 7.1 7.3 6.7 7.9 8.8 11 11 12 9.4 9.0 8.7 8.4 9.6 9.7 9.2 8.9 9.2 9.1 8.6 8.2 8.2 269.2 8.68 12 6.7 534 .58 .66 09 64 8.1 12 11 8.7 10 13 20 13 12 17 13 13 27 21 12 11 9.5 11 9.9 9.6 9.6 14 14 10 13 10 9.6 9.2 9.6 9.3 10 380.1 12.3 27 8.1 754 .81 .94 8.9 12 87 36 96 39 115 62 43 20 16 17 13 54 67 28 18 17 15 12 12 11 11 11 36 45 16 14 12 22___ 965.9 32.2 115 8.9 1920 2.13 2.38 RIO CIBDCO BASIN 50038320 RIO CIBDCO BELOW COROZAL, PR—Continued WATER-QUALITY RECORDS PERIOD OF RECORD.—Water years 1969-76, 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 117 DATE TIME DIS- CHARGE INST. CUBIC FEET PER , SPE- CIFIC CON- DUCT- ANCE SECOND (US/CM) OCT 18 DEC 08 FEB 02 APR 09 JUN 08 AUG 03 OCT 18 DEC 08 FEB 02 APR 09 JUN 08 AUG 03 1989 1045 1315 1990 0930 1030 1200 1130 HARD- NESS TOTAL (MG/L DATE AS CAC03) 1989 110 1990 140 130 27 13 7.9 11 10 8.8 HARD- NESS 306 342 350 237 365 352 NONCARB CALCIUM WH WAT DIS- TOT FLD SOLVED MG/L AS (MG/L CACO3 14 -- -- 6 -- 5 AS CA) 27 — — 35 — 35 PH (STAND- ARD UNITS) 7.60 7.40 7.90 8.00 7.70 7.60 MAGNE- SIUM, DIS- TEMPER- ATURE WATER (DBG C) 24.0 24.0 22.0 24.5 27.0 27.5 TUR- BID- ITY (NTU) 46 1.7 1.4 0.6 3.7 3.8 OXYGEN, DIS- SOLVED (MG/L) 7.9 7.6 7.3 8.3 7.0 7.0 SODIUM POTAS- SODIUM, DIS- SOLVED SOLVED (MG/L AS MG) 10 __ __ 12 -- 11 SOLIDS, FLUO- SILICA, SUM RIDE, DIS- SOLVED DATE (MG/L AS OCT 1989 18... 0 DEC 08... FEB 1990 02... APR 09... 0 JUN 08... AUG 03 ... 0 F) .10 - - .10 - .10 (MG/L AS NA) 16 — — 20 -- 18 AD- SORP- SIUM, DIS- TION SOLVED RATIO (MG/L 0. __ __ 0. -- 0. AS K) 7 4.2 — — 7 3.3 — 7 3.2 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 93 90 83 98 86 87 ALKA- LINITY WAT WH TOT FET FIELD MG/L AS CAC03 100 120 130 130 130 120 OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 38 22 23 <10 31 37 SULFIDE TOTAL (MG/L AS S) 0.8 -- -- <0.5 -- -- COLI- FORM, FECAL, 0.7 DM-MF (COLS./ 100 ML) 5900 5800 25000 K720 3700 540 SULFATE DIS- SOLVED (MG/L AS SO4) 14 __ -_ 14 -- 17 STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) 960 826 2000 220 380 580 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 17 — — 24 -- 24 RESIDUE OF SOLIDS, TOTAL DIS- CONSTI- DIS- AT SOLVED TUENTS, SOLVED DBG 105 NITRO- NITRO- NITRO- NITRO- NITRO- GEN, GEN, GEN, GEN, GEN, . C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC (MG/L DIS- (TONS SUS- AS SOLVED SI02) (MG/L) 24 — — 30 __ 32 172 _ - 215 - 220 PER FENDED DAY) (MG/L) 12.6 -- — 6.62 — 6.20 44 <1 9 <1 11 7 TOTAL TOTAL TOTAL TOTAL TOTAL (MG/L (MG/L (MG/L (MG/L (MG/L AS N) AS 1.19 0 2.85 0 1.60 0 1.66 0 1.84 0 1.66 0 N) AS .11 1 .15 3 .10 1 .04 1 .06 1 .04 1 N) AS N) AS .3 .0 .7 .7 .9 .7 0.79 0.23 0.26 0.11 0.25 0.12 N) 0.81 0.77 0.34 0.29 0.65 0.68 K = non- ideal count 1 18 RIO CIBDCO BASIN 50038320 RIO CIBDCO BELOW COROZAL, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 18... DEC 08.. . FEB 1990 02... APR 09.. . JUN 08... AOG 03.. . DATE OCT 1989 18... DEC 08.. . FEB 1990 02.. . APR 09... JUN 08.. . AOG 03.. . NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 1.6 1.0 0.6 0.4 0.9 0.8 IRON, TOTAL RECOV- ERABLE (UG/L AS FE) 4300 -- -- 160 -- -- NITRO- GEN, TOTAL (MG/L AS N) 2.9 4.0 2.3 2.1 2.8 2.5 LEAD, TOTAL RECOV- ERABLE (OG/L AS PB) 5 -- -- <1 -- -- NITRO- GEN, TOTAL (MG/L AS N03) 13 18 10 9.3 12 11 MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) 100 -- -- 40 -- -- PHOS- PHORUS ARSENIC TOTAL TOTAL (MG/L (UG/L AS P) AS AS) 0.26 <1 0.63 0.54 0.53 1 0.72 0.64 MERCURY TOTAL SELB- RECOV- NIUM, BRABLE TOTAL (UG/L (UG/L AS HG) AS SE) <0.10 <1 __ __ <0.10 <1 __ __ BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 -- -- <100 — — — SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) <1 -- __ <1 -- — BORON, TOTAL RECOV- ERABLE (UG/L AS B) 10 -- -- 20 -- " ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) <10 _- _- <10 -- -- CHRO- CADMIUM MIUM, TOTAL TOTAL RECOV- RECOV- ERABLE BRABLE (UG/L (UG/L AS CD) AS CR) <1 5 __ — <1 2 __ .. CYANIDE TOTAL PHENOLS (MG/L TOTAL AS CN) (UG/L) <0.010 1 __ __ <0.010 2 __ __ COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) 10 — — <10 __ .„ MBTHY- LENB BLUE ACTIVE SUB- STANCE (MG/L) 0.04 — — 0.06 __ __ RIO CIBOCO BASIN 119 50039500 RIO CIBOCO AT VEGA BAJA, PR LOCATION.--Lat 18°26'53", long 66°22'29", Hydrologic Unit 21010002, on left bank, at bridge on Hwy 2, 0.6 mi (1.0 km) downstream from Rio Indio, and 0.8 mi (1.3 km) east of Vega Baja. DRAINAGE AREA.--99.1 mi a (256.7 kma ), of which 25.4 mi» (65.8 km')/ does not contribute directly to surface runoff. HATER-DISCHARGE RECORDS PERIOD OF RECORD.--January 1973 to current year. GAGE.--Water-stage recorder. Datum of gage is 7.79 ft (2.37 m) above mean sea level. REMARKS.--Records fair. Gage-height and precipitation satellite telemetry at station. AVERAGE DISCHARGE.--17 years (1974-90), 131 ft'/s (3.710 m'/s), 17.95 in/yr (456 mm/yr), 94,910 acre-ft/yr (117 hm'/yr); median of yearly mean discharges, 117 ft'/s (3.31 m'/s), 84,800 acre-ft/yr (104 hm'/yr) . EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 34,000 ft'/s (963 m'/s). Dec. 13, 1981, gage height, 19.10 ft (5.822 m) , from rating curve extended above 3,000 ft'/s (85.0 m'/s) on basis of indirect measurements; minimum discharge, 6.1 ft'/s (0.173 m'/s), July 24, 25, 1977. EXTREMES OUTSIDE PERIOD OF RECORD.--Flood of Dec. 11, 1965 reached a stage of 26.2 ft (7.99 m) , datum unknown, discharge about 28,000 ft'/s (793 m'/s). EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 3,200 ft'/s (90.6 mVs) and maximum (*): Discharge (ft'/a) (m'/s) Gage height (ft) (m) Date Time Mar. 16 2115 *7,020 199 *16.55 5.044 Minimum discharge, 20 ft'/s (0.566 m'/s), July 21-23. Discharge (ft'/s) (m'/s) Gage height (ft) (m) Date Time No other peak greater than base discharge. DISCHARGE, CUBIC FEET PER SECOND, HATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES DAY NOV JAN FEB APR MAY JUN AUG SEP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC- FT CFSM IN. CAL YR WTR YR 136 151 585 434 439 377 177 140 119 106 102 95 91 89 88 83 120 411 355 287 166 529 704 539 257 466 210 162 218 284 160 8080 261 704 83 16030 2.63 3.03 1989 1990 254 163 146 137 176 233 213 210 350 166 145 129 124 164 147 113 102 95 94 89 86 81 78 74 71 70 69 66 64 63 --- 3972 132 350 63 7880 1.34 1.49 TOTAL 40895 TOTAL 40190 61 60 59 57 56 56 57 55 53 52 52 51 50 50 49 53 54 50 50 50 47 46 46 43 42 40 39 61 136 94 51 1720 55.5 136 39 3410 .56 .65 MEAN MEAN 54 50 46 39 37 35 36 36 35 35 34 34 33 32 44 39 45 42 39 109 88 47 42 62 49 43 40 41 47 42 38 1393 44.9 109 32 2760 .45 .52 112 MAX 110 MAX 38 37 35 37 36 34 35 77 65 59 46 39 37 157 105 57 70 57 118 78 57 109 118 79 59 52 52 47 __- ___ --- 1790 63.9 157 34 3550 .65 .67 1970 MIN 1570 MIN 59 70 46 39 37 34 34 33 115 131 599 1570 1250 1180 427 1470 1190 405 280 219 178 160 145 123 116 121 120 100 98 85 83 10517 339 1570 33 20860 3.42 3.95 13 AC -FT 21 AC-FT 73 69 72 70 67 65 60 60 59 61 60 56 54 59 57 54 73 236 87 201 120 79 64 56 76 167 91 69 60 56 --- 2431 81.0 236 54 4820 .82 .91 81120 79720 64 172 82 65 59 56 123 515 361 268 190 83 71 148 98 70 58 55 47 47 48 44 38 37 37 54 89 48 43 36 35 3141 101 515 35 6230 1.02 1.18 CFSM 1.13 CFSM 1.11 42 46 45 48 49 49 41 38 37 38 39 36 40 36 307 127 57 46 53 41 37 34 33 44 41 37 33 30 30 31 --- 1565 52.2 307 30 3100 .53 .59 IN. 15.35 IN. 15.09 30 33 29 28 33 32 28 27 26 35 29 25 25 25 29 38 34 55 36 24 22 21 26 40 91 60 37 30 27 26 28 1029 33.2 91 21 2040 .33 .39 24 65 73 40 31 39 35 69 43 56 49 38 39 181 62 42 36 38 34 28 26 27 43 40 32 51 38 31 38 45 97 1490 48.1 181 24 2960 .49 .56 63 53 72 279 130 329 141 223 155 80 37 41 31 111 271 150 72 56 64 52 48 43 41 42 41 235 67 50 41 44 --- 3062 102 329 31 6070 1.03 1.15 120 RIO CIBUCO BASIN 50039500 RIO CIBUCO AT VEGA BAJA, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORD.—Water years 1972 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 17. .. DEC 19. .. FEB 1990 02. .. APR 04. .. JUN 05. .. AUG 07... DATE OCT 1989 17. .. DEC 19. .. FEB 1990 02. .. APR 04. .. JUN 05... AUG 07. .. TIME 0830 1045 1330 1300 1330 1205 HARD- NESS TOTAL (HG/L AS CAC03) 180 — — 190 — 170 DIS- CHARGE, INST. CUBIC FEET PER SECOND 75 50 46 65 47 33 HARD- NESS NONCARB WH WAT TOT FLD MG/L AS CAC03 17 -- -- 21 -- 15 SPE- CIFIC CON- DUCT- ANCE (US/CM) 421 416 420 420 374 391 CALCIUM DIS- SOLVED (MG/L AS CA) 55 — — 61 — 55 PH (STAND- ARD UNITS) 7.50 8.00 8.10 7.90 7.80 7.70 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 9.3 -- -- 9.5 -- 9.1 TEMPER- ATURE WATER (DBG C) 26.0 23.0 25.0 24.5 27.0 28.5 SODIUM, DIS- SOLVED (MG/L AS NA) 17 __ -- 16 -- 17 TUR- BID- ITY (NTU) 7.0 2.6 3.5 0.60 2.4 0.60 SODIUM AD- SORP- TION RATIO 0.6 __ -- 0.5 -- 0.6 OXYGEN, DIS- SOLVED (MG/L) 6.0 7.2 7.0 8.4 6.7 6.0 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 3.3 -- -- 2.5 -- 2.4 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 73 82 84 101 82 76 ALKA- LINITY WAT WH TOT FET FIELD MG/L AS CACO3 170 170 170 180 160 160 OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 22 19 22 14 18 14 SULFIDE TOTAL (MG/L AS S) <0.5 -- -- <0.5 -- — COLI- FORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) K640 550 K650 360 K1000 460 SULFATE DIS- SOLVED (MG/L AS S04) 12 -- -- 11 -- 12 STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) 320 470 K110 K110 600 K91 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 21 -- -- 21 -- 23 DATE OCT 1989 17.. . DEC 19.. . FEB 1990 02.. . APR 04.. . JUN 05.. . AUG 07.. . FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.10 -- -- 0.20 -- 0.10 SILICA, DIS- SOLVED (MG/L AS SI02) 20 -- -- 18 -- 21 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 240 -- -- 245 -- 236 SOLIDS, DIS- SOLVED (TONS PER DAY) 48.5 -- __ 43.3 __ 21 RESIDUE TOTAL AT 105 DBG. C, SUS- PENDED (MG/L) 5 <1 8 4 <1 1 NITRO- GEN, NITRATE TOTAL (MG/L AS N) 1.55 1.46 1.36 1.04 1.06 1.09 NITRO- GEN, NITRITE TOTAL (MG/L AS N) 0.05 0.04 0.04 0.06 0.04 0.01 NITRO- GEN, NO2+NO3 TOTAL (MG/L AS N) 1.60 1.50 1.40 1.10 1.10 1.10 NITRO- GEN, AMMONIA TOTAL (MG/L AS N) 0.07 0.07 0.03 0.04 0.05 0.03 NITRO- GEN, ORGANIC TOTAL (MG/L AS N) 0.33 0.23 0.27 0.36 0.25 0.67 non-ideal count RIO CIBUCO BASIN 50039500 RIO CIBDCO AT VEGA BAJA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 121 DATE OCT 1989 17... DEC 19... FEB 1990 02... APR 04... JON 05... AUG 07.. . DATE OCT 1989 17... DEC 19.. . FBB 1990 02... APR 04.. . JON 05... AUG 07... NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.4 0.3 0.3 0.4 0.3 0.7 IRON, TOTAL RECOV- ERABLE (UG/L AS FE) 740 -- -- 300 -- -- NITRO- GEN, TOTAL (HG/L AS N) 2.0 1.8 1.7 1.5 1.4 1.8 LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) 3 -- -- 4 -- -- NITRO- GEN, TOTAL (MG/L AS N03) 8.9 8.0 7.5 6.6 6.2 8.0 MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS HN) 60 -- -- 50 -- -- PHOS- PHORUS ARSENIC TOTAL TOTAL (HG/L (UG/L AS P) AS AS) 0.24 <1 0.29 0.28 0.18 <1 0.25 0.27 MERCURY TOTAL SELE- RECOV- NIUM, ERABLE TOTAL (UG/L (UG/L AS HG) AS SB) <0.10 <1 __ __ <0.10 <1 __ __ BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 -- -- <100 -- "" SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) <1 -- -- <j. -- — BORON, TOTAL RECOV- ERABLE (UG/L AS B) <10 -- -- <10 -- "" ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) <10 -- -- 10 -- -- CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 — -- 4 — "" CYANIDE TOTAL (MG/L AS CN) <0.010 — -- <0.010 — -- CHRO- MIUM, COPPER, TOTAL TOTAL RBCOV- RECOV- ERABLE ERABLE (UG/L (UG/L AS CR) AS CO) 1 <10 __ __ 2 <10 __ __ METHY- LENE BLUE ACTIVE PHENOLS SUB- TOTAL STANCE (UG/L) (HG/L) 1 0.10 __ __ <1 0.07 __ __ 122 THIS PAGE WAS LEFT BLANK INTENTIONALLY 123 Limestone — ix Igneous and sedimentary rocks 3K Drainage boundary* indeterminate in limestone terrone COROZAL '~—^ Rio Cibueo basin ] &( f\ ' "«A ( "\ T\\\ f -5 S x, u I * Drainage boundary f j \ - "~ / f Rio Grande de Monoti' basin i / s i n ' I l-~^_^--j _ ARRANQUITAS rainage boundary SURFACE-WATER STATION AND NUMBER L.-.- ->w_,. " i ~^ Rio Solirsos (NiSiioS basm \ \ / 03995 ^-t. • f /"• \ ; J 0430 | T QUALITY-OF-WATER STATION AND NUMBER i 99 JL J399 V QUALITV-OF-WATER PARTIAL RECORD STATION AND NUMBER WELL AND WELL NUMBER ^039990 H LAKE-ELEVATION STATION 1 i ! i I 2 J 4 5 6K[LO«£TESS Figure 17.--Rio de la Plata basin. 124 RIO DE LA PLATA BASIN 50039990 LAGO CARITE AT GATE TOWER, PR LOCATION.—Lat 18°03'46", long 66°05'58", Hydrologic Unit 21010005, on top of a concrete tower at diversion tunnel on Carite Reservoir, 0.7 mi (1.1 km) northwest from Escuela Carite Chino, 1.2 mi (1.9 km) northeast from Central Hidroelectrica de Carite Num. 1 and 1.8 mi (2.9 km) northeast from Escuela Segunda Unidad. DRAINAGE AREA.--8.20 mi 2 (21.24 kma ) . ELEVATION RECORDS PERIOD OF RECORD.--May 1989 to current year. GAGE.--Water stage recorder. Datum of gage is mean sea level. REMARKS.--Lago Carite Dam was completed in 1913. The operation of the reservoir is controlled by the utilization of water to meet the demands for domestic, industrial and agricultural purposes in the Guayama Area. The dam is an earthfill with crest elevation of 1,806 ft (550 m) above mean sea level, with a structural height of 104 ft (32 m) and a lenght of 500 ft (152 m). The dam has a capacity of approximately 11,310 acre-feet (13.9 hm3). The Dam is operated by the Puerto Rico Electric and Power Authority. Gage-height and precipitation satellite telemetry at station. EXTREMES OBSERVED FOR PERIOD OF RECORD.--Maximum elevation 1,781.42 ft (542.977 m), Oct. 1, 1989; minimum elevation, 1,761.48 ft (536.899 m); June 13,14, 1990. EXTREMES FOR CURRENT YEAR.--Maximum elevation 1,781.42 ft (542.977 m), Oct. 1; minimum elevation, 1,761.48 ft (536.899 m), June 13,14. Capacity Table Elevation, in feet 1,746 1,760 1,769 (based on Data from Puerto Rico Electric Power Authority) Contents, in acre-feet Elevation, in feet 0 2,471 4,561 1,775 1,780 1,784 Contents,in acre-feet 6, 194 7,704 8,996 ELEVATION (FEET NGVD), WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 OBSERVATION AT 24:00 VALUES OCT FEE JUN JUL 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN MAX MIN 1781. 1781. 1781. 1781. 1781. 1781. 1781. 1781. 1781. 1781. 1781. 1781. 1781. 1780. 1780. 1780. 1780. 1780. 1780. 1780. 1780. 1780. 1780. 1780. 1780. 1780. 1780. 1780. 1780. 1779. 1779. 1780. 1781. 1779. 40 36 32 30 27 28 20 17 14 10 10 07 03 90 87 80 73 71 60 57 54 49 40 34 26 23 12 06 02 95 89 75 40 89 1779.81 1779.73 1779.67 1779.57 1779.57 1779.49 1779.43 1779.35 1779.31 1779.25 1779.16 1779.08 1779.02 1778.92 1778.84 1778.78 1778.70 1778.61 1778.54 1778.46 1778.38 1778.29 1778.20 1778.11 1778.03 1777.96 1777.87 1777.76 1777.66 1777.58 1778.77 1779.81 1777.58 1777. 1777. 1777. 1777. 1777. 1777. 1776. 1776. 1776. 1776. 1776. 1776. 1776. 1776. 1776. 1776. 1776. 1775. 1775. 1775. 1775. 1775. 1775. 1775. 1775. 1775. 1775. 1775. 1774. 1774. 1774. 1776. 1777. 1774. 49 40 32 22 12 05 98 87 79 71 61 50 42 32 23 12 04 96 89 80 69 59 50 42 33 22 14 05 98 87 79 14 49 79 1774 1774 1774 1774 1774 1774 1774 1774 1774 1774 1773 1773 1773 1773 1773 1773 1773 1773 1773 1773 1773 1773 1773 1773 1773 1773 1773 1773 1773 1773 1772 1773 1774 1772 .74 .72 .68 .58 .50 .38 .28 .20 .12 .06 .98 .88 .80 .72 .60 .52 .42 .36 .34 .31 .24 .16 .06 .00 .05 .12 .12 .10 .07 .01 .93 .68 .74 .93 1772. 1772. 1772. 1772. 1772. 1772. 1772. 1772. 1772. 1772. 1772. 1771. 1771. 1771. 1771. 1771. 1771. 1771. 1771. 1771. 1771. 1771. 1771. 1771. 1771. 1771. 1771. 1771.- - - 1771. 1772. 1771. 84 76 71 60 48 39 34 28 23 14 06 98 87 88 78 71 66 58 52 45 42 39 38 52 46 38 31 26 -- -- -- 91 84 26 1771 1771 1771 1770 1770 1770 1770 1770 1770 1770 1770 1770 1770 1770 1770 1770 1770 1770 1770 1770 1770 1770 1770 1770 1769 1769 1769 1769 1769 1769 1769 1770 1771 1769 .20 .14 .03 .96 .86 .78 .70 .61 .53 .44 .41 .42 .50 .71 .67 .64 .59 .52 .43 .36 .28 .21 .14 .07 .97 .90 .88 .84 .68 .54 .42 .40 .20 .42 1769. 1769. 1769. 1768. 1768. 1768. 1768. 1768. 1768. 1768. 1768. 1767. 1767. 1767. 1767. 1767. 1767. 1767. 1767. 1767. 1766. 1766. 1766. 1766. 1766. 1766. 1766. 1765. 1765. 1765.- 1767. 1769. 1765. 32 20 08 98 84 74 62 49 36 19 06 89 92 78 64 55 40 26 17 05 88 73 60 40 38 26 11 94 80 64 -- 54 32 64 1765.52 1765.35 1765.20 1765.04 1764.88 1764.74 1764.58 1764.43 1764.36 1764.38 1764.28 1764.09 1763.96 1763.84 1763.75 1763.60 1763.50 1763.41 1763.29 1763.18 1763.05 1762.96 1762.83 1762.75 1762.66 1762.54 1762.46 1762.39 1762.32 1762.20 1762.12 1763.67 1765.52 1762.12 1762.02 1761.93 1761.85 1761.78 1761.72 1761.69 1761.60 1761.53 1761.73 1761.70 1761.61 1761.55 1761.49 1762.48 1762.92 1762.94 1762.95 1762.93 1762.89 1762.98 1762.97 1762.93 1762.95 1763.00 1763.36 1763.44 1763.42 1763.40 1763.35 1763.33 —— 1762.48 1763.44 1761.49 1763.32 1763.29 1763.23 1763.23 1763.19 1763.70 1763.81 1763.81 1763.78 1763.76 1763.75 1763.71 1763.87 1763.90 1764.32 1764.37 1764.52 1764.72 1764.81 1764.83 1764.83 1764.80 1764.78 1764.88 1765.16 1765.51 1765.60 1765.61 1765.60 1765.60 1765.60 17 64 . 3 8 1765.61 1763.19 1765. 1765. 1765. 1765. 1765. 1765. 1765. 1765. 1765. 1766. 1766. 1766. 1766. 1766. 1766. 1766. 1766. 1766. 1766. 1766. 1766. 1766. 1766. 1766. 1766. 1766. 1766. 1766. 1767. 1767. 1767. 1766. 1767. 1765. 59 59 58 63 69 68 74 78 80 48 57 59 67 67 67 66 66 64 63 60 59 57 55 54 56 53 51 87 12 14 12 39 14 58 1767.10 1767.08 1767.06 1767.03 1767.00 1766.89 1766.81 1766.76 1766.75 1766.68 1766.61 1766.61 1766.54 1766.60 1766.55 1766.64 1766.60 1766.62 1766.58 1766.50 1766.43 1766.37 1766.30 1766.36 1766.32 1766.24 1766.17 1766.13 1766.07 1766.20 —— 1766.59 1767.10 1766.07 WTR YR 1990 MEAN 1770.23 MAX 1781.40 MIN 1761.49 RIO DE LA PLATA BASIN t n a 1 fL O 50043000 RIO DE LA PLATA AT PROYECTO LA PLATA, PR LOCATION.--Lat 18°09'37 M , long 66°13'44" / Hydrologic Unit 21010005, at upstream side of bridge on Highway 173, 0.4 mi (0.6 km) northeast of Proyecto La Plata, and 2.5 mi (4.0 km) upstream from Rio Usabon. DRAINAGE AREA.--63.0 mi a (163.2 km a ), excludes 8.2 mi a (21.1 km a ) upstream from Carite Reservoir, the flow of which is diverted to Rio Guamani. WATER-DISCHARGE RECORDS PERIOD OF RECORD.—1958 (occasional measurements only), February 1959 to March 1960 (monthly measurements only). April 1960 to current year. GAGE.--Water-stage recorder. Elevation of gage is 850 ft (259 m), from topographic map. Prior to Mar. 29, 1961, wire-weight gage read twice daily at same site and datum. REMARKS.--Records fair except those for estimated daily discharge, which are poor. The Puerto Rico Aqueduct and Sewer Authority operates a pumping plant about 5 mi (8 km) upstream which can divert as much as 23 ft3 /s (0.65 mVs) into Cidra Reservoir. Gage-height and precipitation satellite telemetry at station. AVERAGE DISCHARGE.--30 years (1961-90), 107 ftVs (3.030 mVs), 26.52 in/yr (674 mm/yr), 77,520 acre-ft/yr (95.6 hmVyr); median of yearly mean discharges, 84 ft3/s (2.38 mVs) , 60,900 acre-ft/yr (75 hm'/yr) . EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 59,600 ftVs (1,690 mVs), Aug. 27, 1961, gage height, 32.21 ft (9.818 m) , from rating curve extended above 7,000 ft 3 /s (198 mVs) on basis of slope-area measurement; minimum daily discharge, 2.6 ft3 /s (0.074 m3 /s) , July 25, 1974. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 4,000 ftVs ( 113 mVs) and maximum (*): June 15 July 15 Time 0800 1820 Discharge (ftVs) (mVs) 4,790 6,440 136 182 Gage height (ft) (m) 10.86 3.310 11.52 3.511 Aug. 10 Sept. 30 Time 2300 2015 Discharge (ftVs) (mVs) Gage height (ft) (m) 4,360 *6,690 123 189 10.69 *11.66 3.258 3.554 Minimum daily discharge, 3.0 ft 3/s (0.085 m3/s), June 13. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES NOV JAN JUN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC- FT CFSM IN. CAL YR WTR YR 46 74 31 21 29 19 17 17 18 17 17 18 18 19 19 20 22 21 20 25 31 39 22 e!9 e!7 e!6 e!5 14 13 16 14 704 22.7 74 13 1400 .41 .48 1989 1990 13 14 13 14 17 21 15 38 22 13 15 15 15 19 26 16 18 25 19 17 17 15 14 14 14 13 13 12 14 e!2 --- 503 16.8 38 12 998 .31 .34 TOTAL 16578 TOTAL 22029 e!3 ell ell e!2 elO ell elO ell e!2 elO e8.6 e9.0 elO e9.0 e8.2 12 9.1 7.5 8.4 8.5 7.5 6.9 8.5 9.4 8.4 7.5 8.7 5.7 6.6 6.4 7.2 284.1 9.16 13 5.7 564 .17 . 19 .6 MEAN .2 MEAN 9.8 12 10 7. 9 5.8 5.5 5.5 5.3 5.1 5.4 5.4 e5.8 e5.6 e5.4 e5.4 e5.4 e5.6 e6.0 e8. 0 e!5 e!3 elO e7.0 e7.8 e7.4 elO e!3 elO e8.0 e7.0 eS.O 241.1 7.78 15 5.1 478 .14 .16 45.4 MAX 60.4 MAX e7.0 e9.0 e7 .0 e6.0 e5.2 eS.O e5.8 e6.8 e9.0 eS.O e7.0 e6.4 e6.2 e6.2 e7.0 e6.6 e7.0 eS.O e6.6 e7.0 e9.0 elO e!3 e!6 e9.0 e8.4 6.6 5.4 ___ ___ --- 214.2 7.65 16 5.0 425 .14 .15 3150 3060 6.5 8.0 6.7 6.7 7. 8 7. 1 7.2 7.9 9.6 22 16 42 126 611 144 33 36 17 9.9 8.8 8.1 7.1 7.7 7.7 8.4 8.6 9.2 9.2 8.4 8.3 8.4 1224.3 39.5 611 6.5 2430 .72 .83 MIN 4 . 4 MIN 3 . 0 8.6 7.9 8.5 8.2 6.4 6.1 6.0 5.8 5.6 5.7 6.3 6.3 6.2 7.0 6.4 5.3 5.6 6.0 6.1 30 13 6.7 5.0 4.3 5.2 13 12 5.3 4.6 5.2 --- 228.3 7.61 30 4.3 453 .14 . 15 AC-FT 32880 AC-FT 43690 6.3 6.9 11 15 10 7.0 11 15 31 23 20 18 10 14 13 21 29 24 25 18 9.0 5.6 6.2 6.8 6.9 8.3 8.6 8.0 8.8 10 8.2 414.6 13.4 31 5.6 822 .24 .28 CFSM CFSM 7.5 8.8 9.5 11 9.2 13 11 8.1 70 132 21 4.1 3.0 10 3060 789 116 44 29 18 13 5.5 8.3 15 273 347 70 21 5.7 5.8 --- 5138.5 171 3060 3.0 10190 3. 13 3.49 .83 IN. 1.10 IN. 8.4 12 9.9 6.6 13 62 291 77 32 13 11 14 13 18 1330 1150 139 424 225 70 19 12 9.5 14 19 892 1440 136 35 18 8.2 6521.6 210 1440 6.6 12940 3.84 4.43 11.25 14.95 5.6 6.7 15 9.7 12 16 16 6.8 6.0 325 1600 159 41 291 50 15 9.4 9.8 7.4 6.7 6.4 8.8 95 64 18 12 9.6 5.0 803 91 37 3757.9 121 1600 5.0 7450 2.21 2.55 13 7.0 7.2 10 19 19 8.3 24 12 5.7 5.2 13 8.6 9.3 225 59 22 27 e!5 e6.6 5.2 3.3 8.9 23 178 911 70 14 8.3 1060 --- 2797.6 93.3 1060 3.3 5550 1.70 1.90 e Estimated 126 PERIOD OF RECORD.--Water years 1958 to WATER-QUALITY DATE RIO DE LA PLATA BASIN 50043000 RIO DE LA PLATA AT PROYECTO LA PLATA, PR—Continued WATER-QUALITY RECORDS current year. DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 TIME DIS- CHARGE, SPE- INST. CIFIC CUBIC CON- FEET DOCT- PER ANCE SECOND (OS/CM) OXYGEN, OXYGEN DIS- DEMAND, SOLVED CHEM- PH TEMPER- TUR- OXYGEN, (PER- ICAL (STAND- ATURE BID- DIS- CENT (HIGH ARD WATER ITY SOLVED SATUR- LEVEL) UNITS) (DEC C) (NTO) (MG/L) ATION) (MG/L) OCT 1989 23. .. DEC 15. .. FEB 1990 14. .. APR 12. .. JUN 12. .. AUG 09. . . 1245 1515 1400 0840 1130 0900 20 8.6 6.4 6.4 3.3 4.8 414 490 500 314 506 517 8.20 8.50 8.50 8.10 9.20 8.0 28.0 26.0 25.0 26.0 29.0 28.0 0.80 0.70 1.3 2.2 3.5 10 9.7 11.9 10.7 5.3 14.0 4.7 127 148 130 66 183 60 28 18 19 70 76 25 K10000 K70 K110 K100 K44 140 K100 K20 K140 160 K580 180 DATE OCT 1989 23. . . DEC 15. .. FEB 1990 14. . . APR 12. .. JUN 12. .. AUG 09. . . HARD- NESS TOTAL (MG/L AS 160 HARD- NESS NONCARB CALCIUM WH WAT TOT FLD DIS- SOLVED MG/L AS (MG/L MAGNE- SIUM, SODIUM, DIS- DIS- SOLVED SOLVED (MG/L 39 14 (MG/L CACO3) CACO3 AS CA) AS MG) AS NA) 28 190 8 46 18 44 ALKA- SODIUM POTAS- LINITY AD- SIUM, WAT WH SORP- DIS- TOT PET SULFIDE TION SOLVED FIELD TOTAL RATIO (MG/L MG/L AS (MG/L AS K) 170 43 16 42 2.9 CACO3 150 190 180 190 207 170 AS S) <0.5 21 <0.5 29 25 25 47 SOLIDS, RESIDUE DATE OCT 1989 23. .. DEC 15.. . FEB 1990 14. . . APR 12. .. JUN 12.. . AUG 09. .. FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.20 -- -- 0.10 -- 0.10 SILICA, DIS- SOLVED (MG/L AS SIO2) 23 -- -- 25 -- 23 SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 243 -- -- 329 -- 298 SOLIDS, DIS- SOLVED (TONS PER DAY) 13.1 -- -- 5.68 -- 3. 86 TOTAL AT 105 DEC. C, SUS- PENDED (MG/L) 2 <1 8 6 9 20 NITRO- GEN, NITRATE TOTAL (MG/L AS N) 1.77 0.98 1.45 0.68 -- 1.46 NITRO- GEN, NITRITE TOTAL (MG/L AS N) 0.03 0.02 0.05 0.02 <0.01 0.04 NITRO- GEN, N02+NO3 TOTAL (MG/L AS N) 1.8 1.0 1.5 0.70 <0.10 1.5 NITRO- GEN, AMMONIA TOTAL (MG/L AS N) 0.04 0.03 0.02 0.03 0.02 0.08 NITRO- GEN, ORGANIC TOTAL (MG/L AS N) 0.46 0.87 0.68 0.27 2.7 0.92 non-ideal count RIO DE LA PLATA BASIN 50043000 RIO DE LA PLATA AT PROYECTO LA PLATA, PR—Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 127 DATE OCT 1989 23.. . DEC 15... FBB 1990 14.. . APR 12... JUN 12.. . AUG 09.. . DATE OCT 1989 23... DEC 15.. . FBB 1990 14.. . APR 12... JUN 12.. . AUG 09.. . NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.5 0.9 0.7 0.3 2.7 1.0 IRON, TOTAL RECOV- ERABLE (UG/L AS FE) 210 -- -- 250 -- -- NITRO- GEN, TOTAL (MG/L AS N) 2.3 1.9 2.2 1.0 — 2.5 LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) 3 — — 1 — — NITRO- GEN, TOTAL (MG/L AS NO3) 10 8.4 9.7 4.4 -- 11 MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) 30 -- -- 40 -- -- PHOS- PHORUS ARSENIC TOTAL TOTAL (MG/L (UG/L AS P) AS AS) 0.49 <1 0.60 1.1 0.92 1 1.3 0.87 MERCURY TOTAL SELE- RECOV- NIUM, ERABLE TOTAL (UG/L (UG/L AS HG) AS SB) <0.10 <1 — — <0.10 <1 — __ BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 -- -- <100 — — — SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) <1 — — <1 -- -- BORON, TOTAL RECOV- ERABLE (UG/L AS B) 40 -- -- 60 -- — — ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) 10 __ -- <10 -- -- CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 — — <1 — — — CYANIDE TOTAL (MG/L AS CN) 1.0 — — <0.010 — — CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) <1 -- -- <1 -- — — PHENOLS TOTAL (UG/L) <1 __ -_ 5 __ __ COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) 10 -- — 10 -- — — METHY- LENB BLUB ACTIVE SUB- STANCE (MG/L) 0.09 — — 0.16 — — 128 RIO DE LA PLATA BASIN 50043800 RIO DE LA PLATA AT COMERIO, PR LOCATION.--Lat 18°13'23", long 66°13'30", Hydrologic Unit 21010005, on right bank 50 ft (15 m) upstream from bridge off Highway 167 in the Town of Comerio, 0.4 mi (0.6 km) southwest of Comerio High School, and 0.2 mi (0.3 km) notheast of Plaza de Comerio. DRAINAGE AREA.--109 m a (282 km 1 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--December 1988 to current year. GAGE.--Water-stage recorder and crest-stage gage. Datum of gage is 604.2 ft (184.2 m) above mean sea level. REMARKS.--Records fair. Gage-height and precipitation satellite telemetry at station. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 32,000 ft3 /s (906 m3/s). Sept. 18, 1989, gage-height, 17.36 ft (5.291 m) , from flodmark, from rating curve extended above 1,000 ft3 /s (28.3 m3 /s) on basis of step-backwater analysis; minimum discharge, 10 ft'/s (0.283 m3/s), Aug. 28,29, 1990. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 4,000 3ft/s (113 m3 /s) and maximum (*): Discharge (ft 3 /s) (m3 /s) Gage height (ft) (m) Date Time Aug. 29 2030 *2,900 82.1 *7.24 2.207 Minimum discharge, 10 ft 3 /s (0.283 m3 /s), Aug. 28,29. Time Discharge (ft3 /s) (m3 /s) Gage height (ft) (m) DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES DAY DEC JUN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC- FT CFSM IN. CAL YR WTR YR 106 161 145 144 118 95 83 79 75 70 69 67 67 67 68 62 68 58 55 153 214 203 506 184 160 181 121 71 84 91 68 3693 119 506 55 7330 1.10 1.27 1989 1990 57 52 49 47 52 57 53 63 53 47 44 44 42 42 43 42 40 40 39 38 37 36 35 34 34 33 32 32 31 31 --- 1279 42. 6 63 31 2540 .39 .44 TOTAL 44557 TOTAL 16440 30 30 27 26 27 26 26 26 27 28 25 24 24 24 22 23 25 23 22 22 21 21 21 22 22 21 21 21 21 22 20 740 23.9 30 20 1470 .22 .25 MEAN MEAN 21 24 25 23 20 19 19 20 19 19 19 22 20 20 18 19 25 22 20 21 22 24 20 23 22 25 30 40 33 29 23 706 22.8 40 18 1400 .21 .24 122 MAX 45.0 MAX 20 19 18 18 17 17 18 24 28 30 22 19 18 32 34 30 21 22 23 23 22 26 28 35 48 29 22 21 ___ ___ --- 684 24.4 48 17 1360 .23 .23 8420 MIN 506 MIN 25 24 21 19 18 17 17 17 26 40 41 83 202 367 158 70 64 46 33 25 24 21 20 20 19 19 20 19 19 18 18 1530 49.4 367 17 3030 .45 .52 10 AC-FT 11 AC-FT 17 17 17 17 17 16 17 16 16 16 16 17 20 19 18 17 74 34 36 70 50 28 21 18 25 35 36 24 19 17 --- 760 25.3 74 16 1510 .23 .26 88380 32610 17 17 19 18 18 16 47 115 72 69 58 33 26 24 25 24 22 22 21 21 22 23 22 21 20 18 18 18 17 16 15 894 28.8 115 15 1770 .27 .31 CFSM 1. 13 CFSM . 42 15 15 15 14 14 15 17 17 21 40 27 17 16 18 350 171 56 31 23 20 17 15 17 24 29 66 33 21 15 13 --- 1162 38.7 350 13 2300 .36 .40 IN. 15. IN. 5. 13 14 13 15 14 19 44 32 23 15 13 13 21 18 132 303 57 105 60 61 30 18 15 15 19 43 152 50 25 19 14 1385 44.7 303 13 2750 .41 .47 ,28 ,64 13 14 15 14 13 15 15 14 13 15 149 54 30 40 35 17 13 14 13 12 12 12 13 25 17 14 13 11 431 212 48 1326 42.8 431 11 2630 .39 .45 27 19 22 17 20 64 93 89 47 41 33 35 80 141 85 116 54 38 35 25 22 36 33 126 427 322 100 51 35 48 --- 2281 76.0 427 17 4520 .70 .78 RIO DB LA PLATA BASIN 129 50044000 RIO DB LA PLATA NEAR COMBRIO, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°14'33", long 66°12'28", at bridge on Highway 156, 0.56 ml (0.9 km) upstream from dam, about 2.0 mi (3.2 km) northeast of Comerlo plaza. DRAINAGE AREA.--139 ml 2 (360 km2 ), excludes 8.2 mi a (21.1 km2 ) upstream from Carite Reservoir, the flow of which is diverted to Rio Guamanl. PERIOD OP RECORD.—Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 19... NOV 28... FEB 1990 12. .. APR 06. . . JUN 13. .. ADG 08. .. TIME 1000 0830 1130 0945 1210 1150 DIS- CHARGE, INST. CUBIC FEET PER SECOND 63 44 31 28 25 25 SPE- CIFIC CON- DUCT- ANCE (US/CM) 396 416 418 412 460 395 PH (STAND- ARD UNITS) 7.60 8.10 7.80 8.10 7.90 8.10 TEMPER- ATURE WATER (DBG C) 25.5 23.0 24.0 26.0 29.0 30.0 TUR- BID- ITY (NTU) 7.8 6.1 6.5 2.4 12 7.2 OXYGEN, DIS- SOLVED (MG/L) 8.4 6.9 9.0 8.6 8.9 9.7 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 103 81 106 105 115 128 OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 23 29 16 22 22 24 COLI- FORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) 3400 K1100 2900 3900 440 400 STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) 920 K170 K140 K130 K110 K130 DATE OCT 1989 19. .. NOV 28. .. FEB 1990 12. .. APR 06. .. JUN 13. .. AUG 08. .. HARD- HARD- NESS NESS NONCARB CALCIUM TOTAL WH WAT DIS- (MG/L TOT FLD SOLVED AS MG/L AS (MG/L CAC03) CAC03 150 150 150 MAGNE- SIUM, SODIUM, DIS- DIS- SOLVED SOLVED (MG/L (MG/L AS CA) AS MG) AS NA) 37 15 37 15 35 14 23 27 26 SODIUM AD- SORP- TION RATIO ALKA- POTAS- LINITY SIUM, WAT WH DIS- TOT FET SULFIDE SOLVED FIELD TOTAL (MG/L MG/L AS (MG/L AS K) 0.8 3.1 0.9 2.9 0.9 2.6 CAC03 150 160 150 150 170 140 CHLO- SULFATE RIDE, DIS- DIS- SOLVED SOLVED (MG/L (MG/L AS S) AS S04) AS CL) <0.5 18 <0.5 19 16 31 26 OCT 19 NOV 28 FEB 12 APR 06 JUN 13 AUG 08 K = FLUO- RIDE, DIS- SOLVED DATE (MG/L AS F) 1989 0.20 1990 0.20 . . . <0.10 non- ideal count SILICA, DIS- SOLVED (MG/L AS SI02) 25 -- — 27 -- 29 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 235 -- -- 251 -- 233 SOLIDS, DIS- SOLVED (TONS PER DAY) 40.0 — — 18.7 — 15.4 RESIDUE TOTAL NITRO- NITRO- NITRO- AT 105 GEN, GEN, GEN, DBG. C, NITRATE NITRITE NO2+NO3 SUS- TOTAL TOTAL TOTAL FENDED (MG/L (MG/L (MG/L (MG/L) AS N) AS N) AS N) 10 23 12 4 16 11 1.07 0.85 1.34 0.34 0.45 0.44 0.03 0.05 0.06 0.06 0.05 0.06 1.1 0.90 1.4 0.40 0.50 0.50 NITRO- GEN, AMMONIA TOTAL (MG/L AS N) 0.04 0.09 0.10 0.06 0.09 0.12 NITRO- GEN, ORGANIC TOTAL (MG/L AS N) 0.46 0.31 0.50 0.54 4.3 0.38 130 RIO DE LA PLATA BASIN 50044000 RIO DE LA PLATA NEAR COMERIO, PR—Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 19.. . NOV 28.. . FEB 1990 12... APR 06.. . JUN 13... AUG 08.. . DATE OCT 1989 19... NOV 28.. . FEB 1990 12.. . APR 06.. . JUN 13.. . AUG 08... NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.5 0.4 0.6 0.6 4.4 0.5 IRON, TOTAL RECOV- ERABLE (UG/L AS FE) 740 -- -- 510 — -- NITRO- GEN, TOTAL (MG/L AS N) 1.6 1.3 2.0 1.0 4.9 1.0 LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) 2 — -- 1 — — NITRO- GEN, TOTAL (MG/L AS N03) 6.7 5.8 8.9 4.4 22 4.4 MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) 40 -- -- 50 -- -- PHOS- PHORUS ARSENIC TOTAL TOTAL (MG/L (UG/L AS P) AS AS) 0.20 <1 0.28 0.46 0.36 2 0.42 0.37 MERCURY TOTAL SBLB- RECOV- NIUM, BRABLE TOTAL (UG/L (UG/L AS HG) AS SB) 0.30 <1 — — 0.20 <1 — — BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 — -- <100 — — — SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) <1 — — <1 — -- CHRO- BORON, CADMIUM MIUM, TOTAL TOTAL TOTAL RECOV- RECOV- RECOV- ERABLE BRABLE ERABLE (UG/L (UG/L (UG/L AS B) AS CD) AS CR) <10 <1 1 __ __ 90 <1 2 __ — — — — — — ZINC, TOTAL RECOV- CYANIDE ERABLE TOTAL PHENOLS (UG/L (MG/L TOTAL AS ZN) AS CN) (UG/L) <10 <0.010 1 __ __ 10 <0.010 2 __ __ COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) 10 — — 20 — — — MBTHY- LBNE BLUB ACTIVE SUB- STANCE (MG/L) 0.12 — — 0.09 — — RIO DB LA PLATA BASIN 131 50044850 RIO GUADIANA NEAR NARANJITO, PR WATER-QUALITY RECORDS LOCATION.--Lat 19°19'39 m , long 660 13'28", at steel-cross-bridge 0.8 mi (1.3 km) northwest of Highway 164, 1.2 mi (1.9 km) upstream from mouth and about 2.0 mi (3.2 km) northeast of Naranjito plaza. DRAINAGE AREA.--4.0 mi* (10.3 km*). PERIOD OF RECORD.—Water year 1979 to current year. HATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 19. .. NOV 28... FEB 1990 12... APR 06. .. JDN 13. .. AUG 08. . . TIME 1245 1045 1330 1215 1440 1420 DIS- CHARGE, INST. CUBIC FEET PER SECOND 15 9.5 5.2 8.2 9.0 7.6 SPE- CIFIC CON- DUCT- ANCE (US /CM) 322 299 338 206 317 322 PH (STAND- ARD UNITS) 8.00 8.30 8.50 8.60 7.60 8.30 TEMPER- ATURE WATER (DBG C) 27.0 23.5 26.0 27.0 30.0 31.5 TUR- BID- ITY (NTU) 2.6 2.2 1.0 0.50 5.6 6.1 OXYGEN, DIS- SOLVED (MG/L) 7.5 9.0 10.0 9.4 7.7 7.2 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 94 105 122 116 100 97 OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 18 12 15 13 14 21 COLI- FORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) 4800 46000 K640 5500 K890 4200 STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) 930 520 K1100 K10 450 760 DATE OCT 1989 19. .. NOV 28. .. FEB 1990 12. .. APR 06. .. JUN 13. .. AUG 08... HARD- HARD- NESS NESS NONCARB CALCIUM TOTAL WH WAT DIS- (MG/L TOT FLD SOLVED AS MG/L AS (MG/L CAC03) CAC03 MAGNE- SIUM, DIS- SOLVED (MG/L SODIUM, DIS- SOLVED (MG/L SODIUM AD- SORP- TION RATIO POTAS- SIUM, DIS- SOLVED (MG/L ALKA- LINITY WAT WH TOT FET FIELD MG/L AS SULFIDB TOTAL (MG/L SULFATB DIS- SOLVED (MG/L CHLO- RIDE, DIS- SOLVED (MG/L AS CA) AS MG) AS NA) 130 7 30 13 19 140 10 31 14 17 130 8 31 13 17 AS K) 0.7 2.9 0.6 2.1 0.6 2.2 CAC03 110 110 120 120 110 110 AS S) AS S04) AS CL) 1.0 <0.5 19 15 13 20 23 23 SOLIDS, RESIDUE DATE OCT 1989 19.. . NOV 28.. . FBB 1990 12... APR 06... JUN 13.. . AUG 08... FLUO- RIDB, DIS- SOLVED (MG/L AS F) 0.10 -- -- <0.10 -- <0.10 SILICA, DIS- SOLVED (MG/L AS SI02) 26 -- -- 25 -- 27 SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 196 -- -- 197 -- 192 SOLIDS, DIS- SOLVED (TONS PER DAY) 7.94 — -- 4.36 -- 3.94 TOTAL AT 105 DBG. C, SUS- PENDED (MG/L) 4 7 8 <1 9 14 NITRO- GEN, NITRATE TOTAL (MG/L AS N) 1.48 1.49 1.79 — 1.19 1.29 NITRO- GEN, NITRITE TOTAL (MG/L AS N) 0.02 0.01 0.01 <0.01 0.01 0.01 NITRO- GEN, N02+N03 TOTAL (MG/L AS N) 1.5 1.5 1.8 1.6 1.2 1.3 NITRO- GEN, AMMONIA TOTAL (MG/L AS N) 0.03 0.01 0.01 0.01 0.02 0.05 NITRO- GEN, ORGANIC TOTAL (MG/L AS N) 0.27 0.19 0.39 -- 0.18 0.25 non-ideal count 132 RIO DE LA PLATA BASIN 50044850 RIO GUADIANA NEAR NARANJITO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 19... NOV 28.. . FBB 1990 12.. . APR 06.. . JUN 13.. . AUG 08.. . DATE OCT 1989 19... NOV 28.. . FEB 1990 12.. . APR 06... JUN 13.. . AUG 08.. . NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.3 0.2 0.4 <0.2 0.2 0.3 IRON, TOTAL RECOV- ERABLE (UG/L AS FE) 350 -- -- 170 -- -- NITRO- GEN, TOTAL (MG/L AS N) 1.8 1.7 2.2 — 1.4 1.6 LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) 2 — — 1 -- — NITRO- GEN, TOTAL (MG/L AS N03) 8.0 7.5 9.7 -- 6.2 7.1 MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) 40 -- -- 20 -- -- PHOS- PHORUS ARSENIC TOTAL TOTAL (MG/L (UG/L AS P) AS AS) 0.12 <1 0.18 0.31 0.27 1 0.23 0.26 MERCURY TOTAL SBLE- RECOV- NIUM, BRABLE TOTAL (UG/L (UG/L AS HG) AS SB) <0.10 <1 — — <0.10 <1 — — BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 — — <100 — — — SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) <1 — -- <1 — — BORON, TOTAL RECOV- ERABLE (UG/L AS B) 10 -- -- 10 -- — — ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) <10 -- -- <10 -- -- CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 — — 1 — -- CYANIDE TOTAL (MG/L AS CN) •eO.010 — -- <0.010 -- -- CHRO- MIUM, COPPER, TOTAL TOTAL RECOV- RECOV- ERABLE BRABLE (UG/L (UG/L AS CR) AS CU) <1 <10 __ __ 2 <10 __ -- -- MBTHY- LBNE BLUE ACTIVE PHENOLS SUB- TOTAL STANCE (UG/L) (MG/L) 6 0.06 __ __ 1 0.06 __ __ RIO DE LA PLATA BASIN 50045000 LAGO LA PLATA AT DAMSITE, PR 133 LOCATION.--Lat 18°20'40", long 66°14'10", Hydrologic Unit 21010005, 2.9 mi (4.7 km) at northeast of Plaza de Naranjito, 2.7 mi (4.3 km) West of Road 167, km 15.3, Buena Vista, Bayamon, 5.2 mi (8.4 km) east of Plaza de Corozal. DRAINAGE AREA.--181 mi' (469 km') • ELEVATION RECORDS PERIOD OF RECORD.--February 1989 to current year. GAGE.--Water-stage recorder. Datum of gage is mean sea level. REMARKS.--Lago La Plata first construction phase was completed in 1974 and the second construction phase to provide the spillway with bascule gates was completed in October 1989. The maximum storage is 37,000 ac-ft (45.6 hm3 ) and its purpose is the supply of water for domestic and industrial use. La Plata Dam is a concrete gravity structure located across the Rio de la Plata, the dam has an overall length of 774 ft (236 m) and a maximum height of about 131 ft (39.9 m). The dam spillway is provided with 6 bascule gates. The spillway crest has a total clear length of 690 ft (210 m), an elevation of 155 ft. (47.1 m). The Dam is owned and operated by Puerto Rico Aqueduct and Sewer Authority. Gage-height and precipitation satellite telemetry at station. EXTREMES OBSERVED FOR PERIOD OF RECORD.--Maximum elevation, 159.41 ft (48.59 m), May 8, 1990; minimum elevation, 146.96 ft (44.79 m) , Aug. 4, 1989. EXTREMES OBSERVED FOR CURRENT YEAR.--Maximum elevation, 159.41 ft (48.59 m), May 8; minimum elevation, 148.16 ft (45.16 m). Mar. 9. Capacity Table (based on data from Puerto Rico Aqueduct and Sewer Authority) Elevation, in feet 98.43 131.24 154.60 Contents, in acre-feet 2,760 11,360 22,720 Elevation, in feet 164.05 170.61 175.52 Contents, in acre-feet 28,550 33,160 37,040 DAY 1 2 3 4 OCT 155.09 155.13 155.09 155.11 NOV 154.98 154.91 154.86 154.84 ELEVATION (FEET NGVD), WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 OBSERVATION AT 24:00 VALUES DEC 154.52 154.49 154.43 154.36 JAN 152.56 152.56 152.53 152.46 FEB 150.07 149.94 149.80 149.68 MAR 149.15 149.07 148.95 148.84 APR 156.03 155.92 155.82 155.70 MAY 157.10 157.03 156.91 156.80 JUN 155.36 155.22 155.12 155.02 JUL 153.60 153.37 153.19 153.04 AUG 152.33 152.29 152.21 152.06 SEP 150.86 150.77 151.16 151.53 155.10 154.85 154.31 152.36 149.50 148.70 155.56 156.74 155.02 152.88 151.94 151.67 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 154.94 154.89 154.89 154.88 154.96 154.94 154.99 154.91 154.24 154.18 154.14 154.10 154.87 154.87 154.03 154.86 154.85 154.87 154.86 154.82 155.11 154.88 154.84 154.93 155.14 155.24 155.14 154.97 154.90 154.83 154.85 154.84 154.85 154.84 154.83 154.82 154.82 154.81 154.87 154.84 154 .79 154.75 154 .74 154.72 154 .70 153.98 153.92 153.85 153.78 153.72 153.67 153.57 153.48 153.38 153.31 153.22 153.12 153.00 152.91 152.83 152.30 152.20 152.10 151.98 151.90 151.80 151.70 151.60 151.51 151.38 151.30 151.23 151.16 151.09 151.19 151.11 151.01 150.96 150.89 150.83 149.36 149.27 149.23 149.24 149.24 149.15 149.04 148.90 149.23 149.27 149.29 149.22 149.17 149.23 149.15 149.14 149.23 149.29 149.25 149.30 148.53 148.36 148.19 148.24 148.42 149.91 A A 155.68 156.70 157.30 157.69 157.40 157 .24 157.17 157.08 157.00 156.88 156.78 156.72 155.43 155.28 155.13 155.03 154.90 154.76 154.60 154.51 154.44 154.33 154.21 155.74 156.03 156.32 157.25 157.26 157.07 156.91 156.80 157.33 156.54 156.98 159.06 158.22 158.48 158.54 158.49 158.40 158.39 158.27 158.09 157.94 157.76 157.55 157.37 157.16 157.00 156.85 156.66 156.47 154.92 154.77 154.60 154.43 154.37 154.28 154.15 153.99 153.96 155.21 154.92 154.76 154.67 154.59 154.47 154.32 154.19 154.10 154.06 154.05 152.72 152.58 152.48 152.39 152.23 152.04 151.85 151.68 151.57 151.50 152.60 152.95 153.20 153.27 153.30 153.24 153.13 152.99 152.88 152.76 151.76 151.75 151.59 151.65 151.55 151.65 151.71 152.11 152.24 152.22 152.11 151.95 151.79 151.63 151.40 151.21 151.02 150.84 150.60 150.52 151.69 152.86 153.23 153.31 153.25 153.27 153.19 153.13 153.98 154.20 154.42 154.41 154.39 154.42 154.37 154.27 154.14 154.09 153.99 154.85 26 27 28 29 30 31 154.95 154.90 154.90 154.90 154.91 154.90 154.67 154.64 154.62 154.58 154.55 __. 152.74 152.65 152.59 152.73 152.70 152.61 150.69 150.62 150.60 150.59 150.48 150.35 149.32 149.26 149.19 ___ ___ ___ 156.56 156.47 156.38 156.30 156.23 156.12 157.67 157.64 157.48 157.30 157.13 __. 156.31 156.15 155.99 155.82 155.66 155.49 154.08 154.07 153.98 153.88 153.73 --- 152.68 152.93 152.95 152.86 152.71 152.54 150.32 150.13 149.97 150.29 151.00 150.99 155.17 155.03 154.86 154.74 154.71 --- MEAN 154.96 154.81 153.57 151.45 149.32 MAX 155.24 154.99 154.52 152.56 150.07 MIN 154.82 154.55 152.59 150.35 148.90 155.99 157.67 154.21 157.23 159.06 155.49 154.48 155.36 153.73 152.71 153.60 151.50 151.45 152.33 149.97 153.53 155.17 150.77 A No gage-height record. 134 RIO DE LA PLATA BASIN 50045010 RIO DE LA PLATA BELOW LA PLATA DAM, PR LOCATION.--Lat 18°20'45", long 66°14«17", Hydrologic Unit 21010005, 2.8 mi (4.5 km) west of Road 167, km 15.3, Buena Vista, Bayamon, 5.0 mi (8.0 km) east of Plaza de Corozal, 3.0 mi (4.8 km) northeast of Plaza de Naranjito. DRAINAGE AREA.--173 mi 1 (448 km 1 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--July 1989 to current year. GAGE.--Water-stage recorder. Elevation of gage 164 ft (30 m), from topographic map. REMARKS.--Records poor. Regulation at all stages by Puerto Rico Aqueduct and Sewer Authority reservoir upstream from gage. Gage-height and precipitation satellite telemetry at station. EXTREMES FOR PERIOD JULY TO SEPTEMBER 1989.--Maximum discharge, 48,800 ftVs (1,380 m3 /s). Sept. 18, 1989, gage height 22.98 ft (7.00 m), from rating curve extended above 10,000 ftVs (283 m3/s) on basis of step-backwater analysis; no flow many days. FOR CURRENT YEAR.--Maximun discharge, 4,830 ft3 /s (137 m3 /s), Oct. 23, gage-height 13.35 ft (4.07 m), from rating curve extended above 10,000 ftVs (283 m}/s) on basis of step-backwater analysis; minimum discharge, no flow many days. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC-FT CFSM IN. OCT NOV DEC JAN FBB MAR APR JUN JUL SEP ___ __- ___ ___ --- ___ ___ -__ __- --- __ _ ___ -__ .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 ___ ___ ___ ___ ___ .00 .00 .06 .12 .01 .00 .00 .00 .00 .12 .22 .02 .00 .00 .00 .00 .00 .00 .00 .00 .00 .01 .04 .02 .00 .00 . 00 .00 .00 .01 .00 0. 63 .020 .22 .00 1.2 .00 .00 .07 .16 .11 .05 .03 .02 .66 1.5 1.3 110 1050 284 189 97 60 78 186 15200 2290 948 546 636 3110 4450 739 428 351 247 217 184 --- 31403.90 1047 15200 .02 62290 6.06 6.76 RIO DE LA PLATA BASIN 135 50045010 RIO DE LA PLATA BELOW LA PLATA DAM, PR—Continued DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN OUL AUG SEP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC -FT CFSM IN. 159 246 196 223 234 170 109 89 76 68 62 54 45 56 47 36 275 170 74 65 263 503 1310 687 184 290 204 94 84 152 103 6328 204 1310 36 12550 1.18 1.36 114 77 50 37 40 90 87 87 92 55 38 34 33 33 28 24 20 17 29 25 17 10 6.2 4 .1 3.1 1.8 .81 .38 .25 .15 --- 1053.79 35.1 114 .15 2090 .20 .23 .10 .07 .04 .03 .03 .02 .02 .01 .01 .01 .01 .02 .02 .02 .04 .09 . 13 . 13 . 13 .18 .18 .17 .16 .15 .12 .10 .10 .16 1. 1 .74 .39 4.48 .14 1.1 .01 8.9 .00 .00 .31 .27 .22 .19 .15 .15 .15 .13 .13 .13 .12 .11 .10 .07 .12 .10 .17 .15 .11 .53 .50 .27 .17 .31 .20 .12 .10 .11 .17 .28 .34 5.98 .19 .53 .07 12 .00 .00 .18 .11 .15 .13 .12 .05 .09 .28 .26 .15 .08 .03 .01 .95 .62 .44 .30 .23 .48 .32 .22 .28 .50 .58 .34 .26 .21 .20 ___ ___ --- 7.57 .27 .95 .01 15 . 00 .00 .34 .33 .28 .33 .20 .13 .08 .04 .22 .31 1.7 2.8 511 848 51 178 269 187 104 56 54 48 44 41 36 31 28 25 22 20 18 2577.76 83.2 848 .04 5110 .48 .55 16 14 12 10 8.2 6.5 5.3 4.2 3.4 3.0 2.0 1.7 1.0 .67 .36 .25 1.8 12 16 58 98 92 58 31 32 76 81 73 64 51--- 832.38 27.7 98 .25 1650 .16 .18 45 42 36 30 26 22 22 257 663 71 76 74 71 71 67 61 50 40 31 25 30 24 20 17 14 11 9.7 8.2 6.0 5.0 4.0 1928.9 62.2 663 4.0 3830 .36 .42 3.4 3. 1 2.5 2.4 2.7 2.3 1.7 1.4 1.1 1.2 1.1 .96 .90 1.3 168 260 89 26 5.7 1.4 .80 .67 .67 .62 .81 .66 .58 .55 .51 .52 --- 582.55 19.4 260 .51 1160 .11 .13 .63 .64 .57 .35 .29 .20 .15 .12 .13 .28 .12 .03 .00 .00 .00 .31 1.4 .79 .82 2.0 .98 .67 .36 .43 .39 .28 .20 .14 1.0 .66 .30 14.24 .46 2.0 .00 28 .00 .00 .16 .14 .17 .08 .04 .02 .06 .10 .06 .24 .27 .13 .14 .23 .12 .05 .02 .01 .01 .00 .00 .00 .00 .00 .08 .11 .02 .00 .00 .00 .00 2.26 .073 .27 .00 4.5 .00 .00 .00 .00 .01 .08 .41 .40 1.2 .91 .53 .43 .83 .92 .59 .73 1.2 1.3 1.1 1.2 1.7 1.7 1.4 .82 .48 .33 .31 171 154 80 29 8.2 --- 460.78 15.4 171 .00 914 .09 .10 WTR YR 1990 TOTAL 13798.69 MEAN 37.8 MAX 1310 MIN .00 AC-FT 27370 CFSM .22 IN. 2.97 136 RIO DE LA PLATA BASIN 50046000 RIO DE LA PLATA AT HIGHWAY 2 NEAR TOA ALTA, PR LOCATION.--Lat 18°24'41" / long 66°15'39", Hydrologic Unit 21010005, on left bank, at downstream side of bridge on Highway 2, 1.3 mi ( 2.1 km) downstream from Rio Lajas, and 1.6 mi (2.6 km) northwest of Toa Alta, 11.3 mi (18.2 km) downstream from Puerto Rico Aqueduct and Sewer Authority reservoir. DRAINAGE AREA.--208 mi 2 (539 km 2 ), excludes 8.2 mi 2 (21.2 km2 ) upstream from Lago Carite, flow from which is diverted to Rio Guamani. Area at site used prior to September 25, 1984, 200 mi 2 (518 km 2 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--November 1959 (measurement only), January 1960 to current year. Prior to October 1984, published as Rio de la Plata at Toa Alta, P.R.; October 1984 to September 1988 published as 50046900. GAGE.--Water-stage recorder. Datum of gage is 9.15 ft (2.789 m) , above mean sea level. Prior to October, 1984, at site about 1.0 mi (1.6 km) upstream at mean sea level datum. REMARKS.--Records fair except those for estimated daily discharges, which are poor. Regulation at all stages by Puerto Rico Aqueduct and Sewer Authority reservoir upstream from gage. Gage-height and precipitation satellite telemetry at station. AVERAGE DISCHARGE.--30 years (1961-90), 273 ft3/s (7.731 m3/s), 18.54 in/yr (471 mm/yr), 197,800 acre-ft/yr (244 hm3 /yr); median of yearly mean discharges, 228 ft3/s (6.46 m3 /s) , 165,000 acre-ft/yr (203 hmVyr) . EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 95,500 ft1/s (2,700 m3/s), Sept. 6, 1960, gage height, 36.35 ft (11.079m), from floodmark, from rating curve extended above 12,000 ft3 /s (340 m3 /s) on basis of contracted-opening measurement of peak flow at site 1.0 mi upstream and different datum; minimum discharge, 2.2 ft3 /s (0.062 m3/s). Apr. 25, 1984. EXTREMES OUTSIDE PERIOD OF RECORD.--Approximate discharges and elevations of major floods, as pointed out by local residents are as follows: Sept. 13, 1928, 120,000 ft3 /s (3,400 m3 /s), gage height, 37.4 ft (11.40 m); June 16, 1943, 82,000 ftj /s (2,322 m3 /s) , gage height, 34.4 ft (10.48 m) , at site 1.0 mi upstream and different datum. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 6,000 ft3 /s (170 m3 /s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft3/s) (m3 /s) (ft) (m) Date Time (f jt/s) (m3 /s) (ft) (m) Oct. 23 2125 *3,490 98.8 *9.17 2.795 Minimum discharge, 14 ft3 /s (0.396 m3 /s) , Aug. 8,9. REVISIONS.--The peak discharges and annual maximum (*) reported for some water years have been revised as shown in the following table. They supersede figures published in the reports for 1985,1986,1987,1988 and 1989. WATER YEAR 1985 1986 Discharge Date Nov. Nov. Apr. Apr. May May May Oct. Oct. Oct. Nov. May 5, 7, 25, 30, 16, 17, 18, 7, 8, 26, 15, 1, 1984 1984 1985 1985 1985 1985 1985 1985 1985 1985 1985 1986 (ft3 /s) 19, 13, 9, 12, 8, 29, 38, *73, 11, 9, 9, 8, 580 870 010 480 270 350 900 230 830 520 960 100 (m3 /s) 554 393 255 353 234 831 1,100 2,070 335 270 282 229 Gage (ft) 18 15 13 15 12 20 21 *24 14 13 13 12 height .05 .89 .42 .25 .96 .44 .61 .58 .94 .72 .98 .85 (m) 5. 4. 4. 4. 3. 6. 6. 7. 4. 4. 4. 3. WATER Discharge YEAR Date 502 843 090 648 950 230 587 492 554 182 261 917 1986 May May 1987 Apr. May 1988 Nov. Nov. May Aug. Sept, 1989 Feb. Sept, Sept, 13, 14, 12, 21, 25, 27, 10, 24, .11, 17, .18, .24, (f 3t/s) 1986 1986 1987 1987 1987 1987 1988 1988 1988 1989 1989 1989 30,950 25,110 *21,150 10,950 15,360 *29,280 8,880 20, 010 9,700 11,690 *37,730 9,810 (m3 /s) 876 711 599 310 435 829 251 567 275 331 1, 070 278 Gage height (ft) 20 19 *18 14 16 *20 13 18 13 14 *21 13 .64 .53 .54 .50 .53 .43 .34 .19 .83 .87 .47 .89 (m) 6.291 5.953 5.651 4.420 5.038 6.227 4.066 5.544 4.215 4.532 6.544 4.234 RIO DE LA PLATA BASIN 137 50046000 RIO DE LA PLATA AT HIGHWAY 2 NEAR TOA ALTA, PR DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC -FT CFSM IN. CAL YR WTR YR 217 298 350 273 245 281 143 108 95 88 77 88 68 63 64 58 244 355 112 78 662 797 1250 1320 303 405 264 136 184 220 147 8993 290 1320 58 17840 1.45 1.67 1989 1990 234 124 87 77 107 108 151 237 208 112 101 71 74 87 68 58 53 49 49 52 49 43 38 36 33 32 31 30 29 28 --- 2456 81.9 237 28 4870 .41 .46 TOTAL 73888 TOTAL 30122 28 27 27 27 27 26 27 26 26 25 26 26 25 24 24 25 26 25 25 24 23 22 23 23 23 22 24 76 144 43 31 970 31.3 144 22 1920 .16 .18 MEAN MEAN 30 28 27 25 23 23 25 22 24 24 23 24 22 22 30 27 32 28 27 95 37 25 21 36 26 24 22 21 29 30 25 877 28.3 95 21 1740 .14 .16 202 MAX 82.5 MAX 22 22 21 22 23 22 23 32 e28 e25 e22 e20 e25 e66 e40 e25 e30 e25 e50 e30 e24 e46 e50 e31 e24 e33 23 25 ___ ___ --- 829 29.6 66 20 1640 .15 .15 14200 MIN 1540 MIN 43 31 20 18 18 18 e!7 el7 e40 e27 e51 e!86 781 1540 185 780 553 299 266 123 88 81 74 66 62 62 56 49 46 45 42 5684 183 1540 17 11270 .92 1.06 11 AC- FT 17 AC- FT 39 36 33 32 30 30 27 27 26 28 30 26 25 27 23 24 32 56 37 119 87 93 74 46 55 79 88 74 66 60 --- 1429 47.6 119 23 2830 .24 .27 146600 59750 72 84 59 51 48 47 50 285 1360 195 e90 e54 e47 el30 e60 e43 e38 e34 e31 e31 e32 e28 e25 e24 e23 e50 e60 e30 e26 e24 e23 3154 102 1360 23 6260 .51 .59 CFSM 1.01 CFSM .41 33 31 27 34 36 42 31 23 25 26 24 25 23 25 384 450 135 56 33 23 20 19 20 24 25 20 23 20 20 21 --- 1698 56.6 450 19 3370 .28 .32 IN. 13. 76 IN. 5.61 23 24 23 23 33 22 27 27 23 29 e22 e20 el9 e!8 e20 e23 22 26 21 18 20 20 23 49 128 66 22 19 18 17 18 863 27.8 128 17 1710 .14 .16 17 208 47 23 26 23 21 23 93 49 40 22 24 31 25 22 22 28 23 21 21 50 109 e26 e21 e32 e24 e20 e24 e28 e64 1207 38.9 208 17 2390 .19 .22 e41 e34 C46 el70 e84 e210 e90 el50 e80 e45 e23 e28 e23 e!80 ellO e60 e40 e37 e42 e34 e31 e28 e27 e28 e27 el60 e45 e33 e27 e29 --- 1962 65.4 210 23 3890 .33 .37 Estimated 138 RIO DE LA PLATA BASIN 50046000 RIO DE LA PLATA AT HWY 2 NR TOA ALTA, PR—Continued (National stream-quality accounting network station) WATER-QUALITY RECORDS PERIOD OF RECORD.—Water years 1958 to current year WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 05. . . DEC 05. . . FEB 1990 09. .. APR 10. . . JDN 04. . . AUG 06. .. DATE OCT 1989 05. . . DEC 05. . . FEB 1990 09. . . APR 10. . . JUN 04. . . AUG 06. .. DATE OCT 1989 05. . . DEC 05. .. FEB 1990 09. . . APR 10. . . JUN 04. .. AUG 06. . . TIME 1000 1300 1345 1230 1115 1500 HARD- NESS NONCARB WH WAT TOT FLD MG/L AS CACO3 0 0 0 0 21 0 SOLIDS, RESIDUE AT 180 DEC. C DIS- SOLVED (MG/L) 177 299 302 270 270 260 DIS- CHARGE, INST. CUBIC FEET PER SECOND 190 61 27 30 35 22 CALCIUM DIS- SOLVED (MG/L AS CA) 34 65 60 62 59 59 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 183 302 285 286 276 261 SPE- CIFIC CON- DUCT- ANCE (US/CM) 300 522 451 288 446 418 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 8.7 12 12 12 13 10 SOLIDS, DIS- SOLVED (TONS PER DAY) 90.8 49.2 22.3 23. 6 25.2 15.6 PH (STAND- ARD UNITS) 7.60 7.70 7.90 8. 10 7.70 7.60 SODIUM, DIS- SOLVED (MG/L AS HA) 15 23 23 23 24 20 NITRO- GEN, NO2+NO3 DIS- SOLVED (MG/L AS N) 0.49 1.0 1.0 0.50 0.60 0.70 TEMPER- ATURE WATER (DEG C) 28.0 27.5 26.0 28.5 29.5 31.5 SODIUM AD- SORP- TION RATIO 0.6 0.7 0.7 0.7 0.7 0.6 NITRO- GEN, AMMONIA DIS- SOLVED (MG/L AS N) 0.02 0.30 0.10 0.01 0.03 0.02 TUR- BID- ITY (NTU) 9.4 1.6 1.0 5.7 1.6 4 .0 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 3.1 3 .0 3.6 2.3 1.9 2.9 NITRO- GEN, AMMONIA DIS- SOLVED (MG/L AS NH4) 0.03 0.39 0.13 0.01 0.04 0.03 OXYGEN, DIS- SOLVED (MG/L) 7.2 9.0 10.3 11.2 8.1 9.2 ALKA- LINITY WAT WH TOT FET FIELD MG/L AS CACO3 110 200 180 190 180 170 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.70 0.90 0.50 0.30 0.50 0.40 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 91 112 124 142 104 123 SULFATE DIS- SOLVED (MG/L AS SO4) 14 21 20 19 15 19 PHOS- PHORUS TOTAL (MG/L AS P) 0.07 0.26 0.28 0.20 0.24 0.14 COLI- FORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) 2700 2200 27000 K8200 350 K700 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 18 33 35 31 32 28 PHOS- PHORUS DIS- SOLVED (MG/L AS P) 0.05 0.29 0.25 0.18 0.23 0.11 STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) K100 50 3200 K200 K170 K30 FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.10 0.10 0.20 0.20 0.20 0.20 PHOS- PHORUS ORTHO, DIS- SOLVED (MG/L AS P) 0.04 0.27 0.27 0.20 0.21 0.10 HARD- NESS TOTAL (MG/L AS CAC03) 120 210 200 200 200 190 SILICA, DIS- SOLVED (MG/L AS SIO2) 20 19 17 19 19 16 PHOS- PHATE, ORTHO, DIS- SOLVED (MG/L AS P04) 0.12 0.83 0.83 0.61 0.64 0.31 K = non-ideal count RIO DE LA PLATA BASIN 50046000 RIO DE LA PLATA AT HWY 2 NR TOA ALTA, PR—Continued (National stream-quality accounting network station) WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 139 DATE OCT 1989 05. . . DEC 05. . . FEB 1990 09. . . APR 10. . . JUN 04. . . AUG 06. . . ALUM- INUM, DIS- SOLVED (UG/L AS AL) 100 -- 20 -- 20 20 ARSENIC BARIUM, DIS- DIS- SOLVED SOLVED (UG/L (UG/L AS AS) AS BA) <1 39 __ 1 54 __ 2 50 2 64 BERYL- LIUM, DIS- SOLVED (UG/L AS BE) <0.5 -- <0.5 -- 0.6 <0.5 CHRO- CADMIUM MIUM, COBALT, DIS- DIS- DIS- SOLVED SOLVED SOLVED (UG/L (UG/L (UG/L AS CD) AS CR) AS CO) <1. 0 <1 <3 _- <1.0 <5 <3 __ 1.0 <1 <3 <1.0 1 <3 COPPER, IRON, DIS- DIS- SOLVED SOLVED (UG/L (UG/L AS CU) AS FE) <1 45 __ < 10 5 __ 3 7 3 6 LEAD, LITHIUM DIS- DIS- SOLVED SOLVED (UG/L (UG/L AS PB) AS LI) <1 <4 __ <10 <4 __ 5 <4 1 5 DATE OCT 1989 05. . . DEC 05. . . FEB 1990 09. .. APR 10. . . JUN 04. .. AUG 06. . . MANGA- NESE, DIS- SOLVED (UG/L AS MM) 10 -- 75 _- 37 81 MERCURY DIS- SOLVED (UG/L AS HG) <0. 1 -- 0.1 -- <0. 1 <0. 1 MOLYB- DENUM, DIS- SOLVED (UG/L AS MO) 10 -- <10 __ <10 <10 NICKEL, DIS- SOLVED (UG/L AS NI) 2 _- 10 __ 2 1 SELE- STRON- NIUM, SILVER, TIUM, DIS- DIS- DIS- SOLVED SOLVED SOLVED (UG/L (UG/L (UG/L AS SB) AS AG) AS SR) <1 <1.0 140 __ <1 <1.0 250 __ <1 <1.0 260 <1 <1.0 230 VANA- DIUM, DIS- SOLVED (UG/L AS V) 8 -- <6 -_ 7 <6 ZINC, DIS- SOLVED (UG/L AS ZN) 1800 -- 4 -- 7 5 PESTICIDE ANALYSES DATE JUN 1990 04. .. PCB, TIME TOTAL (UG/L) 1115 <0.1 ALDRIN, TOTAL (UG/L) <0. 010 CHLOR- DANE, TOTAL (UG/L) <0. 1 ODD, TOTAL (UG/L) <0.010 DDE, TOTAL (UG/L) <0.010 DOT, TOTAL (UG/L) <0.010 DI- AZINON, TOTAL (UG/L) 0.02 DI- ELDRIN TOTAL (UG/L) <0.010 ENDO- SULFAN, TOTAL (UG/L) <0.010 DATE JUN 1990 04.. . ENDRIN, TOTAL (UG/L) <0.010 ETHION, TOTAL (UG/L) <0.01 HEPTA- CHLOR, TOTAL (UG/L) <0.010 HEPTA- CHLOR EPOXIDE TOTAL (UG/L) <0.010 LINDANE TOTAL (UG/L) <0.010 MALA- THION, TOTAL (UG/L) 0.01 METH- OXY- CHLOR, TOTAL (UG/L) <0.01 METHYL PARA- THION, TOTAL (UG/L) <0.01 METHYL TRI- THION, TOTAL (UG/L) <0.01 MI REX, TOTAL (UG/L) <0.01 DATE JUN 1990 04. . . PARA- THION, TOTAL (UG/L) <0.01 NAPH- THA- LENES, POLY- CHLOR. TOTAL (UG/L) <0. 10 PER- THANE TOTAL (UG/L) <0.1 TOX- APHENE, TOTAL (UG/L) <1 TOTAL TRI- THION (UG/L) <0.01 2,4-D, TOTAL (UG/L) 0.02 2,4,5-T TOTAL (UG/L) <0.01 2, 4-DP TOTAL (UG/L) <0.01 SILVEX, TOTAL (UG/L) <0.01 140 RIO DE LA PLATA BASIN 50046000 RIO DE LA PLATA AT HWY 2 NR TOA ALTA, PR—Continued (National stream-quality accounting network station) WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 PARTICLE-SIZE DISTRIBUTION OP SUSPENDED SEDIMENT DATE NOV 1989 05. .. DEC 05. .. FEB 1990 09. . . APR 10. .. JUN 04. .. AUG 06. .. TIME 1000 1300 1345 1230 1115 1500 STREAM- PLOW, INSTAN- TANEOUS (CPS) 190 61 27 30 35 22 SEDI- MENT, SUS- PENDED (MG/L) 70 71 68 12 17 4 SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) 36 12 5 .97 1.6 .24 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .062 MM 97 98 97 54 51 86 141 O C E A N O ATLANTICO Drainage boundaries indeterminate m limestone terrene Limestone Igneous onti sedimentary rocks C^DRA , V- V- ^x )\ ) K> -Map area EXPLANATION 47550 SURFACE-WATER STATION AND NUMBER .78 QUALITY-OF-WATER STATION AND NUMBER I220 WELL AND WELL NUMBER I 047550 LAKE-ELEVATION STATION )jj ( Z 3 4 5 & KILOMETERS Figure 18.--Rio Hondo to Rio Puerto Nuevo basins. 142 RIO HONDO BASIN 50047530 RIO HONDO AT FLOOD CHANNEL NEAR CATANO, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°26'13", long 66°09'36", at Rio Hondo Channel, 800 ft (245 m) below junction with Rio Hondo, 0.9 mi (1.5 km) downstream from bridge on de Diego Expressway and 1.1 mi (1.8 km) above mouth. DRAINAGE AREA.--Indeterminate. PERIOD OF RECORD.—Water years 1979 to current year. WATER-QUALITY DATA, HATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 25... DEC 20. .. FEB 1990 16. .. APR 30. . . JUN 26... AUG 21... TIME 1045 0800 0705 0920 0650 0755 DIS- CHARGE, INST. CUBIC FEET PER SECOND NP NF NF NF NF NF SPE- CIFIC CON- DUCT- ANCE (US/CM) 11000 27500 3900 13000 28500 24200 PH (STAND- ARD UNITS) 8.40 7.60 7.50 8.70 8.10 8.60 TEMPER- ATURE HATER (DBG C) 30.0 24.0 21.5 27.0 27.5 28.5 TUR- BID- ITY (NTU) 5.7 7.7 30 4.2 6.0 9.7 OXYGEN, DIS- SOLVED (MG/L) 5.4 2.7 6.8 11 4.2 9.8 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 70 9 75 137 52 124 OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 33 430 75 320 780 23 COLI- FORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) 3200 38000 32000 K12000 200000 2000 STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) 210 K300 2200 K20 3400 K1200 DATE OCT 1989 25... DEC 20. .. FEB 1990 16. .. APR 30. .. JUN 26. .. AUG 21. .. HARD- HARD- NESS NESS NONCARB CALCIUM TOTAL WH WAT DIS- (MG/L TOT FLD SOLVED AS MG/L AS (MG/L CACO3) CACO3 MAGNE- SIUM, SODIUM, DIS- DIS- SOLVED SOLVED (MG/L (MG/L AS CA) AS MG) AS NA) SODIUM AD- SORP- TION RATIO ALKA- POTAS- LINITY SIUM, HAT WH DIS- TOT PET SULFIDE SOLVED FIELD TOTAL (MG/L MG/L AS (MG/L AS K) 1200 0 92 230 2000 25 73 1500 0 120 280 2200 25 85 730 590 60 140 1200 20 54 CACO3 120 160 84 160 170 140 CHLO- SULFATE RIDE, DIS- DIS- SOLVED SOLVED (MG/L <0.5 510 <0.5 240 380 (MG/L AS S) AS SO4) AS CL) 3700 4800 2500 DATE OCT 1989 25... DEC 20... FEB 1990 16... APR 30... JUN 26.. . AUG 21... FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.30 -- -- <0.10 -- 0.30 SILICA, DIS- SOLVED (MG/L AS SI02) 11 — — 15 — 11 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 6690 -_ -_ 7840 -- 4400 RESIDUE SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, SOLVED DBG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL PER FENDED (MG/L (MG/L (MG/L (MG/L (MG/L DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) 11 17 35 33 <1 15 0.31 — 0.30 0.12 0.05 — 0.09 0.03 0.10 0.08 0.05 <0.01 0.40 <0.10 0.40 0.20 0.10 <0.10 0.33 2.50 0.55 0.18 0.53 0.10 0.87 0.60 0.25 1.9 0.47 0.40 NF = No flow K = non-ideal count RIO HONDO BASIN 50047530 RIO HONDO AT FLOOD CHANNEL NEAR CATAND, PR—Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 143 DATE OCT 1989 25... DEC 20.. . FEB 1990 16... APR 30... JDN 26.. . AUG 21... DATE OCT 1989 25.. . DEC 20... FEB 1990 16... APR 30... JDN 26.. . ADG 21.. . NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 1.2 3.1 0.8 2.1 1.0 0.5 IRON, TOTAL RECOV- ERABLE (UG/L AS FE) NITRO- GEN, TOTAL (MG/L AS N) 1.6 — 1.2 2.3 1.1 — ^ LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) NITRO- GEN, TOTAL (MG/L AS NO3) 7.1 — 5.3 10 4.9 -- MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) PHOS- PHORUS TOTAL (MG/L AS P) 0.18 0.75 0.27 0.40 0.41 0.17 MERCURY TOTAL RECOV- ERABLE (UG/L AS HG) ARSENIC TOTAL (UG/L AS AS) <1 — — 1 — -- SELE- NIUM, TOTAL (UG/L AS SE) BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) 200 — — <100 — — SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) BORON, TOTAL RECOV- ERABLE (UG/L AS B) 830 — -- 1000 — -- ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) <^~ CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <2 — — <1 — — CYANIDE TOTAL (MG/L AS CN) CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) <1 -- — 1 — -- PHENOLS TOTAL (UG/L) S COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) 30 — — 10 — — METHY- LENE BLUE ACTIVE SUB- STANCE (MG/L) 580 450 <2 140 180 0.10 <0.10 <1 20 •cO.010 <1 30 <0.010 0.64 0.66 144 RIO DE BAYAMON BASIN 50047550 LAGO CIDRA AT DAMSITE NEAR CIDRA, PR LOCATION.--Lat 18°11'57", long 66°08'29", Hydrologic Unit 21010005, at Lago de Cidra Dam on Rio de Bayamon, 1.9 mi (3.0 km) northeast of Plaza de Cidra and 1.8 mi (2.9 km) northwest of Escuela Segunda Unidad de Bayamon. DRAINAGE AREA.--8.26 mi 1 (21.4 km1 ). ELEVATION RECORDS PERIOD OP RECORD.--January 1988 to current year. GAGE.--Water-stage recorder. Datum of gage is 1,337.58 ft (407.694 m) above mean sea level; gage readings has been adjusted to elevations above mean sea level. REMARKS.--Lago de Cidra was completed in 1946. The maximum storage is 5,300 ac-ft (6.53 hm3 ) and provides supple- mental water to metropolitan San Juan. The dam is a concrete gravity and earthfill structure approximately 541 ft (165 m) long between abutments with a maximum structural height of about 78.7 ft (24.0 m) . The spillway portion of the dam, length 131 ft (40.0 m) and crest elevation 1,322 ft (403 m), is an ungated ogee crest located 131 ft (40.0 m) from the right abutment. This dam is owned by Puerto Rico Aqueduct and Sewer Authority. EXTREMES OBSERVED FOR PERIOD OP RECORD.--Maximum elevation 1,323.99 ft (403.552 m), Feb. 3, 1988; minimum elevation 1,305.18 ft (397.819 m) , Sept. 30, 1990. EXTREMES OBSERVED FOR CURRENT YEAR.--Maximum elevation, 1,322.32 ft (403.043 m) , Nov. 3; minimum elevation, 1,305.18 ft (397.819 m) , Sept. 30. Capacity Table (based on data from Puerto Rico Electric Power Authority) Elevation, in feet 1,305 1,309 1,312 Contents, in acre-feet 1,970 2,610 3,100 Elevation, in feet 1,319 1,322 1,324 Contents, in acre-feet 4,400 5,200 5,800 ELEVATION (FEET NGVD), WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 OBSERVATION AT 24:00 VALUES DEC JUN SEP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN MAX MIN 1322. 1322. 1322. 1322. 1322. 1322. 1321. 1321. 1321. 1321. 1321. 1321. 1321. 1321. 1321. 1321. 1321. 1321. 1321. 1321. 1321. 1321. 1321. 1322. 1322. 1322. 1322. 1322. 1322. 1322. 1322. 1321. 1322. 1321. 27 21 17 09 05 00 98 97 92 84 77 69 61 54 47 39 39 45 50 56 83 87 93 02 07 10 13 16 19 24 27 89 27 39 1322 1322 1322 1322 1322 1322 1322 1322 1322 1322 1322 1322 1322 1321 1321 1321 1321 1321 1321 1321 1321 1321 1321 1321 1321 1321 1320 1320 1320 1320 1321 1322 1320 .30 .31 .28 .20 .14 .14 .11 .11 .10 .07 .06 .01 .01 .98 .95 .91 .81 .67 .53 .39 .30 .25 .19 .13 .07 .01 .91 .74 .59 .47 --- .66 .31 .47 1320. 1320. 1320. 1320. 1319. 1319. 1319. 1319. 1319. 1319. 1319. 1318. 1318. 1318. 1318. 1318. 1318. 1318. 1318. 1318. 1318. 1317. 1317. 1317. 1317. 1317. 1317. 1317. 1317. 1316. 1316. 1318. 1320. 1316. 38 29 16 06 96 84 70 52 39 26 10 96 84 68 55 45 38 30 24 16 06 95 85 73 61 51 41 28 12 94 73 59 38 73 1316 1316 1316 1315 1315 1315 1315 1315 1315 1315 1315 1315 1314 1314 1314 1314 1314 1314 1314 1314 1314 1314 1313 1313 1313 1313 1313 1313 1313 1313 1313 1314 1316 1313 .54 .41 .30 .97 .99 .83 .64 .49 .33 .27 .17 .05 .91 .76 .61 .53 .42 .30 .20 .15 .10 .02 .96 .88 .80 .78 .72 .67 .61 .54 .48 .72 .54 .48 1313. 1313. 1313. 1313. 1313. 1312. 1312. 1312. 1312. 1312. 1312. 1312. 1312. 1312. 1312. 1312. 1312. 1311. 1311. 1311. 1311. 1311. 1311. 1311. 1311. 1311. 1311. 1311.- - - 1312. 1313. 1311. 40 33 25 13 02 90 83 75 74 67 59 46 32 34 28 21 10 99 94 86 76 79 79 77 69 65 58 48 -- -- -- 34 40 48 1311 1311 1311 1311 1310 1310 1310 1310 1310 1310 1310 1310 1311 1312 1312 1312 1312 1312 1312 1312 1312 1312 1312 1312 1312 1312 1312 1312 1311 1311 1311 1311 1312 1310 .38 .32 .21 .05 .90 .77 .57 .40 .44 .58 .67 .96 .45 .03 .19 .46 .61 .71 .75 .73 .66 .56 .47 .40 .31 .24 .14 .07 .98 .89 .77 .73 .75 .40 1311. 1311. 1311. 1311. 1311. 1310. 1310. 1310. 1310. 1310. 1310. 1310. 1310. 1310. 1309. 1309. 1309. 1309. 1309. 1309. 1309. 1309. 1309. 1309. 1309. 1309. 1309. 1309. 1309. 1309.- 1310. 1311. 1309. 64 53 43 29 10 99 88 76 54 37 23 13 04 00 89 78 72 61 52 59 62 53 39 27 33 37 38 35 25 13 -- 09 64 13 1308 1308 1308 1308 1308 1308 1308 1308 1308 1308 1308 1308 1308 1308 1308 1308 1308 1308 1307 1307 1307 1307 1307 1307 1307 1306 1306 1306 1306 1306 1306 1307 1308 1306 .99 .97 .89 .73 .61 .47 .27 .17 .20 .17 .26 .28 .16 .16 .22 .24 .18 .05 .92 .79 .68 .56 .42 .28 .12 .98 .84 .71 .59 .47 .35 .86 .99 .35 1306. 1306. 1306. 1305. 1305. 1305. 1305. 1305. 1306. 1306. 1306. 1306. 1306. 1306. 1307. 1307. 1307. 1307. 1307. 1307. 1307. 1307. 1307. 1307. 1307. 1307. 1307. 1307. 1307. 1307.- 1306. 1307. 1305. 22 13 02 92 86 80 78 78 00 08 19 19 13 10 06 24 32 31 30 26 25 15 40 40 63 77 87 92 86 75 -- 79 92 78 1307 1307 1307 1307 1307 1307 1307 1307 1307 1307 1307 1307 1307 1306 1306 1306 1306 1306 1307 1307 1307 1307 1307 1306 1306 1307 1307 1307 1307 1307 1307 1307 1307 1306 .69 .64 .58 .46 .38 .38 .46 .44 .41 .36 .25 .13 .00 .79 .74 .72 .89 .97 .07 .09 .15 .11 .01 .92 .94 .32 .46 .50 .48 .41 .16 .22 .69 .72 1307. 1307. 1307. 1307. 1307. 1307. 1307. 1307. 1307. 1307. 1307. 1307. 1308. 1308. 1308. 1308. 1308. 1308. 1308. 1308. 1308. 1308. 1308. 1308. 1308. 1308. 1308. 1308. 1308. 1308. 1308. 1308. 1308. 1307. 08 12 19 14 16 18 17 16 29 61 76 87 29 51 66 65 75 76 70 62 50 57 65 70 66 61 56 45 44 41 38 08 76 08 1308.22 1308.09 1307.97 1307.84 1307.82 1307.72 1307.64 1307.60 1307.52 1307.41 1307.27 1307.04 1306.79 1306.63 1306.58 1306.54 1306.47 1306.41 1306.34 1306.22 1306.02 1305.86 1305.71 1305.58 1305.46 1305.46 1305.54 1305.44 1305.31 1305.18 --- 1306.66 1308.22 1305.18 WTR YR 1990 MEAN 1312.31 MAX 1322.31 MIN 1305.18 RIO DE BAYAMON BASIN 50047600 RIO DE BAYAMON NEAR AGUAS BUENAS, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°14'39", long 66°08'39", at bridge on Highway 156, and 2.9 mi (4.7 DRAINAGE AREA.--18.5 mi 2 (47.9 km 2 ). PERIOD OF RECORD.--Water years 1958-65, 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 145 km) west of Aguas Buenas plaza. DATE OCT 1989 23. . . DEC 15. .. FEE 1990 14. .. APR 12. .. JUN 12. .. AUG 09. . . DATE OCT 1989 23. .. DEC 15. .. FEB 1990 14. .. APR 12. .. JUN 12. .. AUG 09. . . TIME 1545 1200 1645 1130 0840 1230 HARD- NESS TOTAL (MG/L AS CACO3 ) 100 -- -- 110 -- 98 DIS- CHARGE, INST. CUBIC FEET PER SECOND 30 31 33 18 8.7 19 HARD- NESS NONCARB WH WAT TOT FLD MG/L AS CAC03 0 -- -- 1 -- 0 SPE- CIFIC CON- DUCT- ANCE (US/CM) 224 249 273 218 335 269 CALCIUM DIS- SOLVED (MG/L AS CA) 32 -- -- 26 -- 23 PH (STAND- ARD UNITS) 7.70 7.80 8.30 7.50 8.00 8.50 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 5.5 -- -- 11 -- 9.9 TEMPER- ATURE WATER (DEC C) 24.0 22.0 22.5 23.0 25.0 27.0 SODIUM, DIS- SOLVED (MG/L AS NA) 12 -- -- 22 -- 20 TUR- BID- ITY (NTU) 28 6.4 5.0 1.3 0.40 1.4 SODIUM AD- SORP- TION RATIO 0.5 -- -- 0.9 -- 0.9 OXYGEN, DIS- SOLVED (MG/L) 6.5 9.3 8.5 9.9 7.2 9.1 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 1.5 -- -- 1.4 -- 2.3 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 79 107 99 116 88 115 ALKA- LINITY WAT WH TOT FET FIELD MG/L AS CACO3 86 100 100 110 140 100 OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 28 14 23 18 18 27 SULFIDE TOTAL (MG/L AS S) <0.5 -- -- 1.4 -- -- COLI- FORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) K150000 240 4100 K180 K120 200 SULFATE DIS- SOLVED (MG/L AS S04) 9.0 -- -- 8.4 -- 8.3 STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) 950 K160 4800 K90 2000 340 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 15 -- -- 20 -- 19 DATE OCT 1989 23. .. DEC 15... FEB 1990 14.. . APR 12.. . JUN 12.. . AUG 09. .. FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.10 -- -- <0.10 -- <0.10 SILICA, DIS- SOLVED (MG/L AS SIO2) 20 -- -- 25 -- 24 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 147 -- -- 180 -- 166 SOLIDS, DIS- SOLVED (TONS PER DAY) 11.9 -- -- 8.75 -- 8.52 RESIDUE TOTAL AT 105 DEC. C, SUS- PENDED (MG/L) 14 2 7 4 6 1 NITRO- GEN, NITRATE TOTAL (MG/L AS N) 0.68 — 0.49 -- 0.29 0.09 NITRO- GEN, NITRITE TOTAL (MG/L AS N) 0.02 <0.01 0.01 <0.01 0.01 <0.01 NITRO- GEN, NO2+NO3 TOTAL (MG/L AS N) 0.70 0.60 0.50 0.20 0.30 0.10 NITRO- GEN, AMMONIA TOTAL (MG/L AS N) 0.03 0.02 0.01 <0.01 0.02 0.01 NITRO- GEN, ORGANIC TOTAL (MG/L AS N) 0.47 — 0.49 -- 0.38 0.39 K = non-ideal count 146 RIO DE BAYAHON BASIN 50047600 RIO DE BAYAHON NEAR AGDAS BUENAS, PR—Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 23. .. DEC 15. . . FEE 1990 14. .. APR 12. .. JUN 12. .. ADG 09. .. OCT 1989 23. .. DEC 15. .. FEE 1990 14. .. APR 12. .. JUN 12. .. ADG 09.. . NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.5 <0.2 0.5 <0.2 0.4 0.4 IRON, TOTAL RECOV- ERABLE (DG/L AS FE) NITRO- GEN, TOTAL (MG/L AS N) 1.2 - 1.0 -- 0.70 0.50 LEAD, TOTAL RECOV- ERABLE (DG/L AS PB) NITRO- GEN, TOTAL (MG/L AS N03) 5.3 -- 4.4 -- 3.1 2.2 MANGA- NESE, TOTAL RECOV- ERABLE (DG/L AS MN) PHOS- PHORDS TOTAL (MG/L AS P) 0.08 0.07 0.06 0.02 0.04 0.04 MERCURY TOTAL RECOV- ERABLE (DG/L AS HG) ARSENIC TOTAL (DG/L AS AS) <1 -- -- <1 -- -- SELE- NIUM, TOTAL (DG/L AS SB) BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 -- — <100 — -- SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) BORON, TOTAL RECOV- ERABLE (UG/L AS B) <10 -- -- 10 -- -- ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 — -- <1 -- -- CYANIDE TOTAL (MG/L AS CN) CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) 3 -- -- <1 -- -- PHENOLS TOTAL (DG/L) COPPER, TOTAL RECOV- ERABLE (DG/L AS CD) 10 — -- <10 -- -- METHY- LENE BLDE ACTIVE SUB- STANCE (MG/L) 3000 120 51 60 20 0. 10 <0.10 <1 <0.010 <0.010 0.03 0.12 RIO DE BAYAMON BASIN 50047850 RIO BAYAMON NR BAYAMON, PR LOCATION. --Lat 18°20'08", long 66°08'13", Hydrologic Unit 21010005, on left bank, at rock quarry near Highway 174, 1.3 mi 9 (2.1 km 9 ) south of colonia Santa Rosa and 4.7 mi (7.6 km) south of Bayamon. 147 DRAINAGE AREA. --41. 8 mi 9 (108.3 km3 ). WATER-DISCHARGE RECORDS PERIOD OP RECORD. — September 1964 to October 1970, June 1988 to current year. GAGE. — Water-stage recorder and crest-stage gage. Elevation of gage is 98 ft (30 m) , from topografic map. REMARKS. --Records fair. Diversion to the Guaynabo water treatment plant, for municipal supply, made upstream from station (at Represa de San Juan) . Plow is regulated by storage and release of water at La go de Cidra (capacity 5,220 acre-ft) , 10.5 mi (16.9 km) upstream. Gage-height and precipitation satellite telemetry at station. AVERAGE DISCHARGE. --8 years (1965-70,1990), 37.2 ft'/s (1.054 m'/s) , 12.08 in/yr (307 mm/yr) , 26,950 acre-ft/yr (33.2 hmVyr). EXTREMES POR PERIOD OP RECORDS .- -Maximum discharge 28,000 ft'/s (793 m'/s) , Oct. 9, 1970, gage height 20.2 ft (6.16 m) , from rating curve extended above 1,000 ftVs (28.3 m'/s) on basis of step-back water analysis; minimum discharge, 0.7 ft'/s (0.020 mVs), July 2, 1967. EXTREMES POR CURRENT YEAR. --Peak discharges greater than base discharge of 2,000 ft3 /s (56.6 m'/s) and maximum (*) : Discharge Time (ft'/s) (mVs) Gage height (ft) (m) Date May 5 1800 *2,810 79.6 *9.92 3.024 Minimum discharge, 2.8 ft'/s (0.079 m3/s), Sept. 29,30. Discharge Time (ft'/s) (m'/s) Date No other peak greater than base discharge Gage height (ft) (m) REVISIONS.--The secondary peak discharges greater than base discharge of 2,000 ftVs (56.6 mVs), not reported on 1989 water year are listed in the following table: Date Nov. 22 Discharge Time (ft3 /s) (m3/s) 1715 3,730 106 Gage height (ft) (m) 11.08 3.377 Date Feb. 17 Discharge Time (ftVs) (m'/s) 1800 9,520 Gage height (ft) (m) 15.72 4.791 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC-PT CFSM IN. OCT 20 77 35 25 88 45 25 22 22 20 19 18 19 19 18 18 59 38 20 18 23 27 153 114 33 26 23 21 22 21 27 1115 36.0 153 18 2210 .86 .99 DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES NOV DEC JAN PEB MAR APR MAY JUN JUL 30 21 17 17 21 67 33 31 32 23 19 19 18 20 19 17 18 18 17 20 19 17 15 15 15 15 14 14 14 13 628 20.9 67 13 1250 .50 .56 13 13 13 14 12 11 12 11 11 11 11 11 12 11 11 13 12 11 11 10 9.9 9.8 9.4 9.9 9.6 9.4 8.8 9.6 25 14 11 360.4 11.6 25 8.8 715 .28 .32 CAL YR 1989 WTR YR 1990 TOTAL 13413.7 MEAN 36.7 TOTAL 7764.1 MEAN 21.3 13 38 25 14 12 11 10 11 11 11 11 10 9.6 9.9 8.9 8.7 13 9.7 11 24 16 10 10 16 10 9.8 12 9.9 9.9 9.4 8.5 393.3 12.7 38 8.5 780 .30 .35 .7 MAX .3 MAX 9.1 8.7 9.0 9.4 8.3 8.2 11 22 16 21 12 10 9.3 45 17 13 12 15 39 17 26 49 28 22 15 14 12 11___ ___ --- 489 .0 17.5 49 8.2 970 .42 .44 2340 MIN 348 MIN 14 12 11 10 9.8 9.3 9.3 9.0 22 75 98 237 338 348 91 98 105 24 15 12 10 9.2 8.6 8.1 7.8 8.5 8.9 8.6 8.6 7.6 7.6 1640. 9 52.9 348 7.6 3250 1.27 1.46 8.2 AC-FT 2.9 AC-FT 6.8 6.5 6.4 6.0 6.0 5.6 5.8 5.6 5.4 5.9 5.6 5.1 7.4 7.7 5.9 5.5 8.4 9.2 11 24 11 6.4 5.3 5.0 13 99 8.6 5.5 5.1 4.8 --- 313.5 10.4 99 4.8 622 .25 .28 26610 15400 4.7 6.7 4.9 4.7 4.3 4.1 4.1 34 210 57 23 22 23 30 21 16 15 13 12 11 19 10 10 9.4 8.8 8.7 8.7 8.4 7.8 7.4 7.4 626.1 20.2 210 4.1 1240 .48 .56 CPSM .88 CPSM .51 7.3 16 8.5 13 14 12 9.0 8.4 8.2 11 8.0 7.2 7.0 7.0 82 28 16 15 14 14 13 14 17 16 15 13 12 12 11 11--- 439.6 14.7 82 7.0 872 .35 .39 IN. 11. IN. 6. 13 12 11 13 14 12 11 11 10 9.8 10 9.2 9.0 10 9. 1 15 14 30 11 9.1 8.9 8.5 9.7 12 15 11 9. 6 8.4 7.8 8.0 7.5 349. 6 11.3 30 7.5 693 .27 .31 94 91 AUG 7.5 9.9 22 9.0 8.8 8.8 26 19 66 28 15 18 156 91 17 13 12 13 11 9.7 9.7 9.6 9.9 9.7 18 13 10 10 9.1 9.3 9.5 678.5 21.9 156 7.5 1350 .52 .60 SEP 8.7 9.2 84 54 12 44 87 18 9.9 6.2 5.2 76 167 14 5.3 3.9 26 47 7.0 4.1 5.4 3.9 4.8 5.2 3.3 3.1 2.9 3.1 730.2 24.3 167 2.9 1450 .58 .65 148 RIO BAYAMON BASIN 50047850 RIO BAYAMON NEAR BAYAMON, PR--Continued WATER QUALITY RECORDS PERIOD OP RECORD.-- OCTOBER 1989 TO SEPTEMBER 1990 STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DOCTANCE TURE (CFS) (UMHOS) (DEC C) OCT. NOV. DEC. JAN. FEB. MAR. 03 02 18 04 06 08 1237 1514 1330 1250 0940 1649 34, 21. 12, 13 8, 8, .3 .1 .4 .81 .57 270 306 311 296 347 326 29.0 28.5 25.0 24.5 22.0 28.5 DATE TIME APR. 20 0934 MAY 15 1432 JUNE 15 1059 JULY 12 1318 AUG. 28 1517 SEPT 13 1410 STREAMFLOW, S INSTANTANEOUS (CFS) 45.3 21.0 59.6 8.28 8.78 4.61 PECIFIi DUCTAJ (UMHO 230 306 195 323 343 346 TEMPERA- TURE (DEC C) 24.5 29.0 27.0 28.0 24.0 29.5 RIO DE BAYAMON BASIN 149 50047990 RIO GOAYNABO NEAR BAYAMON, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°22'32", long 660 07'59 H , at bridge on Highway 833, 0.2 mi (0.3 km) upstream from Rio de Bayamon, and 2.3 mi (3.7 km) southeast of Bayamon plaza. DRAINAGE AREA.--73.2 mi* (189.6 km*). PERIOD OF RECORD.--Water years 1958, 1964, 1971-73, 1976, 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 16. .. NOV 28. .. FEB 1990 08. . . APR 09. . . JUN 06. . . AUG 22. .. TIME 1030 1400 1115 1400 0840 1100 DIS- CHARGE, INST. CUBIC FEET PER SECOND 36 22 30 21 21 20 SPE- CIFIC CON- DUCT- ANCE (US/CM) 378 404 340 264 372 431 PH (STAND- ARD UNITS) 7.40 7.90 7.70 7.80 7.40 7.40 TEMPER- ATURE WATER (DEG C) 26.5 28.0 29.5 29.5 26.0 29.5 TUR- BID- ITY (NTU) 3.5 5.6 9.4 0.80 25 10 OXYGEN, DIS- SOLVED (MG/L) 6.2 8.4 7.6 7.3 5.2 3.4 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 77 107 98 94 63 44 OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) <10 23 21 19 46 16 COLI- FORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) K15000 48000 K13000 3000 38000 6000 STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) 2700 420 8500 K100 4500 K100 DATE OCT 1989 16. . . NOV 28. . . FEB 1990 08. . . APR 09. .. JUN 06. .. AUG 22. . . HARD- NESS TOTAL (MG/L AS HARD- NESS NONCARB WH WAT TOT FLD MG/L AS CACO3 CALCIUM DIS- SOLVED (MG/L AS CA) MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) SODIUM, DIS- SOLVED (MG/L AS NA) 140 0 38 11 25 160 0 43 13 30 170 1 47 13 29 SODIUM AD- SORP- TION RATIO POTAS- SIUM, DIS- SOLVED ALKA- LINITY WAT WH TOT FET FIELD SULFIDE TOTAL SULFATE DIS- SOLVED (MG/L MG/L AS (MG/L AS K) 0.9 3.8 1 3.1 1 3.2 (MG/L CACO3 140 160 130 170 140 170 CHLO- RIDE, DIS- SOLVED (MG/L AS S) AS SO4) AS CL) <0.5 12 25 <0.5 12 34 7.5 34 SOLIDS, RESIDUE DATE OCT 1989 16. .. NOV 28.. . FEB 1990 08. . . APR 09. .. JUN 06.. . AUG 22. .. FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.10 -- -- 0.10 -- 0.20 SILICA, DIS- SOLVED (MG/L AS SIO2) 24 -- -- 30 -- 32 SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 223 -- -- 263 -- 268 SOLIDS, DIS- SOLVED (TONS PER DAY) 21.7 -- -- 15.2 -- -- TOTAL AT 105 DEG. C, SUS- PENDED (MG/L) <1 22 40 <1 25 <1 NITRO- GEN, NITRATE TOTAL (MG/L AS N) 0.54 0.57 0.56 0.59 0.50 0.40 NITRO- GEN, NITRITE TOTAL (MG/L AS N) 0.06 0.13 0.04 0.11 0.10 0.10 NITRO- GEN, NO2+NO3 TOTAL (MG/L AS N) 0.60 0.70 0.60 0.70 0.60 0.50 NITRO- GEN, AMMONIA TOTAL (MG/L AS N) 0.14 0.42 0.09 0.26 0.36 0.44 NITRO- GEN, ORGANIC TOTAL (MG/L AS N) 0.36 0.38 0.41 0.34 1.2 0.26 non- ideal count 150 RIO DE BAYAMON BASIN 50047990 RIO GOAYNABO NEAR BAYAMON, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 16. .. NOV 28. . . FEB 1990 08.. . APR 09.. . JUN 06.. . AOG 22.. . DATE OCT 1989 16. .. NOV 28. . . FEB 1990 08. . . APR 09. . . JUN 06.. . AOG 22.. . NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.5 0.8 0.5 0.6 1.6 0.7 IRON, TOTAL RECOV- ERABLE (OG/L AS FE) 540 -- -- 490 -- -- NITRO- GEN, TOTAL (MG/L AS N) 1.1 1.5 1.1 1.3 2.2 1.2 LEAD, TOTAL RECOV- ERABLE (OG/L AS PB) 3 -- -- 1 -- -- NITRO- GEN, TOTAL (MG/L AS NO3) 4.9 6.6 4.9 5.8 9.7 5.3 MANGA- NESE, TOTAL RECOV- ERABLE (OG/L AS MM) 160 -- -- 260 -- -- PHOS- PHOROS TOTAL (MG/L AS P) 0.16 0.31 0.22 0.36 0.33 0.33 MERCURY TOTAL RECOV- ERABLE (OG/L AS HG) <0. 10 -- -- <0.10 -- -- BARIUM, TOTAL ARSENIC RECOV- TOTAL ERABLE (OG/L (OG/L AS AS) AS BA) <1 <100 __ __ 2 100 __ _ _ _ _ SILVER, SELE- TOTAL NIUM, RECOV- TOTAL ERABLE (UG/L (UG/L AS SE) AS AG) <1 <1 __ __ <1 <1 __ __ CHRO- BORON, CADMIUM MIUM, COPPER, TOTAL TOTAL TOTAL TOTAL RECOV- RECOV- RECOV- RECOV- ERABLE ERABLE ERABLE ERABLE (UG/L (UG/L (UG/L (UG/L AS B) AS CD) AS CR) AS CU) <10 <1 <1 20 __ __ 50 <1 1 10 __ __ __ __ __ METHY- ZINC, LBNE TOTAL BLUE RECOV- CYANIDE ACTIVE ERABLE TOTAL PHENOLS SUB- (UG/L (MG/L TOTAL STANCE AS ZN) AS CN) (UG/L) (MG/L) 10 <0.010 5 0.08 __ __ <10 <0.010 3 0.09 __ __ RIO DB BAYAMON BASIN -J 5 -J 50048510 RIO DB BAYAMON AT FLOOD CHANNEL AT BAYAMON, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°24'29", long 66°09'04", at bridge on Highway 890, 1.0 (1.6 km) downstream from bridge on High- way 2, and 3.2 mi (5.1 km) above mouth. DRAINAGE AREA.--71.9 mi a (186.2km 9 )- PERIOD OP RECORD.--Water years 1974 to current year. REMARKS.--Prior to 1979 sampling site was 0.8 mile (1.3 km) downstream but was changed because of flood channel construction. WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 17. .. NOV 30. .. FEB 1990 13. .. APR 17. .. JUN 06. .. AUG 06. .. TIME 1200 1100 0830 1415 1100 1110 DIS- CHARGE, INST. CUBIC FEET PER SECOND 74 49 38 38 53 31 SPE- CIFIC CON- DUCT- ANCE (OS/CM) 400 392 400 360 324 364 PH (STAND- ARD UNITS) 7.40 7.80 7.70 8.20 7.40 7.60 TEMPER- ATURE WATER (DEG C) 28.5 26.0 25.0 30.0 28.0 29.5 TUR- BID- ITY (NTU) 3.6 2.5 2.3 3.7 35 15 OXYGEN, DIS- SOLVED (MG/L) 7.1 6.8 6.4 9.0 5.6 9.1 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 91 84 76 117 70 117 OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 20 10 16 13 29 26 COLI- FORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) 5800 50000 21000 3400 20000 K8400 STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) K500 K360 K1500 K100 2800 K100 OCT 1989 17. .. NOV 30. .. FEB 1990 13. .. APR 17. .. JUN 06. . . AUG 06. .. HARD- NESS TOTAL (MG/L AS HARD- NESS NONCARB WH WAT TOT FLD MG/L AS CALCIUM DIS- SOLVED (MG/L MAGNE- SIUM, DIS- SOLVED (MG/L SODIUM, DIS- SOLVED (MG/L SODIUM AD- SORP- TION RATIO POTAS- SIUM, DIS- SOLVED (MG/L ALKA- LINITY WAT WH TOT PET FIELD MG/L AS CAC03) CAC03 150 150 140 AS CA) AS MG) AS NA) 39 12 23 13 24 38 12 22 AS K) 0.8 3.2 0.8 2.3 0.8 2.3 CAC03 150 140 160 160 140 140 SULFATE 3ULFIDE DIS- TOTAL SOLVED (MG/L (MG/L <0.5 16 <0.5 14 17 CHLO- RIDE, DIS- SOLVED (MG/L AS S) AS SO4) AS CL) 25 31 28 DATE OCT 1989 17.. . NOV 30. . . FEB 199 13.. . APR 17.. . JUN 06. . . AUG 06. . . FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.10 -- -- 0.30 -- 0.30 SILICA, DIS- SOLVED (MG/L AS SIO2) 24 -- -- 30 -- 14 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 232 -- -- 248 -- 218 SOLIDS, DIS- SOLVED (TONS PER DAY) 46.4 -- -- 25.0 -- 18.2 RESIDUE TOTAL AT 105 DEG. C, SUS- PENDED (MG/L) <1 14 2 17 21 35 NITRO- GEN, NITRATE TOTAL (MG/L AS N) 0.36 0.54 0.45 0.27 0.35 0.28 NITRO- GEN, NITRITE TOTAL (MG/L AS N) 0.04 0.06 0.05 0.03 0.05 0.02 NITRO- GEN, NO2+NO3 TOTAL (MG/L AS N) 0.40 0.60 0.50 0.30 0.40 0.30 NITRO- GEN, AMMONIA TOTAL (MG/L AS N) 0.07 0.09 0.08 0.04 0.16 0.04 NITRO- GEN, ORGANIC TOTAL (MG/L AS N) 0.23 0.31 0.22 0.36 0.34 0.46 K = non-ideal count 152 RIO DE BAYAMON BASIN 50048510 RIO DE BAYAMON AT FLOOD CHANNEL AT BAYAMON, PR—Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 17. .. NOV 30. . . FEB 1990 13. .. APR 17.. . JUN 06.. . AUG 06. . . DATE OCT 1989 17. .. NOV 30. . . FEB 1990 13. .. APR 17. .. 17 ... JUN 06. . . AUG 06. .. NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.3 0.4 0.3 0.4 0.5 0.5 IRON, TOTAL RECOV- ERABLE (UG/L AS FE) 1200 -- -- 1200 -- -- -- NITRO- GEN, TOTAL (MG/L AS N) 0.7 1.0 0.8 0.7 0.9 0.8 LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) 5 -- -- 3 -- -- -- NITRO- GEN, TOTAL (MG/L AS NO3) 3.1 4.4 3.5 3.1 4.0 3.5 MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MM) 200 -- -- 260 -- -- -- PHOS- PHORUS TOTAL (MG/L AS P) 0.11 0.16 0.26 0.20 0.15 0.18 MERCURY TOTAL RECOV- ERABLE (UG/L AS HG) <0.10 -- -- <0. 10 -- -- -- BARIUM, TOTAL ARSENIC RECOV- TOTAL ERABLE (UG/L (UG/L AS AS) AS BA) <1 <100 __ __ 1 100 __ _. SILVER, SELE- TOTAL NIUM, RECOV- TOTAL ERABLE (UG/L (UG/L AS SE) AS AG) <1 <1 __ __ <1 <1 __ __ __ BORON, TOTAL RECOV- ERABLE (UG/L AS B) 30 -- -- 30 -- " ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) <10 -- -- <10 -- -- -- CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- <1 -- CYANIDE TOTAL (MG/L AS CN) •cO.010 -- -- <0.010 -- -- -- CHRO- MIUM, COPPER, TOTAL TOTAL RECOV- RECOV- ERABLE ERABLE (UG/L (UG/L AS CR) AS CU) <1 10 __ __ 2 20 __ _. METHY- LENE BLUE ACTIVE PHENOLS SUB- TOTAL STANCE (UG/L) (MG/L) 3 0.07 __ -- 4 0.03 __ __ __ RIO PUERTO NUEVO BASIN 153 50048770 RIO PIEDRAS AT EL SBNORIAL, PR LOGATION.--Lat 18°21'51", long 66°03'56", Hydrologic Unit 21010005, on right bank, in the Riberas of Senorial Housing area, 0.6 mi (1.0 km) west of Highway 176 and 2.7 mi (4.3 km) southwest of Rio Piedras Plaza. DRAINAGE AREA.--7.49 mi a (19.4 km 1 ). WATER-DISCHARGE RECORDS PERIOD OF RECORDS.--March 1988 to current year. GAGE.—Water-stage recorder. Elevation of gage in 98.4 ft (30.0 m) , from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 4,680 ft3 /s (132 m3 /s), Aug. 24, 1988, gage height, 16.08 ft (4.901 m), from rating curve extended above 200 ft3/s (5.66 m3 /s) on basis of step-backwater analysis; minimum daily discharge, 2.1 ft3 /s (0.06 m3 /s), June 10, 1989. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,500 ft3 /s ( 42.5 m3 /s) and maximum (*): Discharge Time (ft3 /s) (m3/s) Gage height (ft) (m) Date Oct. 2 1315 *3,210 90.9 *13.04 3.974 Minimum daily discharge, 3.2 ft3/s (0.091 m3/s), Aug. 24. Discharge Time (ft3/s) (m3/s) Gage height (ft) (m) No other peak greater than base discharge. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES NOV DEC JAN FEB APR JUN JUL AUG SEP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC -FT CFSM IN. CAL YR WTR YR 41 316 52 60 84 33 24 29 24 22 20 19 19 19 56 26 17 14 38 25 26 96 47 42 39 37 35 29 16 39 46 1390 44.8 316 14 2760 5.99 6.90 1989 1990 55 17 13 13 15 14 14 28 45 43 13 13 13 20 25 22 18 11 16 12 10 9.1 9.2 7.7 8.6 6.6 10 19 18 17 --- 535.2 17.8 55 6.6 1060 2.38 2.66 TOTAL 8455, TOTAL 5719. 20 e!8 e!5 e!2 e7.6 e7.7 e7.9 e8.3 e7.6 e7.6 e8.2 e8.0 e8.2 e9.0 e8.4 el8 e!2 eS.O 7.7 7.4 7.1 7.1 7.0 7.7 7.8 7.4 7.1 11 e72 e8.0 e60 408.8 13.2 72 7.0 811 1.76 2.03 . 0 MEAN .7 MEAN e!5 ell e!9 18 12 8.0 7.9 8.2 6.9 7.0 8.6 6.5 6.5 8.7 8.9 8.3 10 8.6 e20 e28 e90 e!7 e26 e37 el5 e!2 ell e!5 e23 el8 e!4 505.1 16.3 90 6.5 1000 2.18 2.51 23.2 MAX 15.7 MAX e!3 ell e9.6 e!2 eS.O e6.4 elO e!3 e!8 e!6 elO e7.0 e!2 eSO e6.5 e8.3 e7.9 ell elO e6.0 e8.2 e!4 elO e7.3 eS.O ell e!2 e!6 ___ ___ --- 332.2 11.9 50 6.0 659 1.58 1.65 610 MIN 316 MIN e!7 e7.9 e6.6 e6.0 e6.4 e6.0 eS.6 eS.5 e23 elO ellO e80 elOO e40 e!5 e35 e!3 elO ell e9.0 e6.0 e9.8 e6.4 e6.4 e5.6 e7.0 ell e7.8 12 8. 1 7.5 604.6 19.5 110 5.5 1200 2.60 3.00 2.1 AC-FT 3.2 AC-FT 6.6 6.2 5.1 4.9 5.7 5.0 6.8 5.5 5.9 5.8 5.7 6.4 32 24 8.4 7.4 17 17 20 31 9.4 9.5 9.7 8.9 64 16 8.8 6.7 7.9 8.3 --- 375.6 12.5 64 4.9 745 1.67 1.87 16770 11350 7.0 8.0 7.2 5.4 4.6 4.7 4.3 9.5 77 19 27 11 16 18 10 7.9 11 8.2 9.8 7.8 7.0 8.0 9.2 8.6 8.2 7.4 5.8 4. 9 4. 9 6.1 5.4 348.9 11.3 77 4.3 692 1.50 1.73 CFSM 3, CFSM 2 22 9.9 13 22 27 8.7 7.3 6.2 6.6 7.2 6.2 5.3 5.2 14 16 7.7 6.0 5.9 6.5 5.3 4.8 5.6 5.5 5.9 6.0 5.7 5.2 5.2 5.2 5.2 --- 262.3 8.74 27 4.8 520 1.17 1.30 .09 IN. 41, .09 IN. 28, 5.1 5.1 5.7 5.6 16 6.2 13 6.1 9.5 5.7 4.8 4.4 4.7 6.1 5.2 5.2 9.1 11 5.6 4.7 5.5 5.5 6.7 21 7.1 8.2 6. 8 8.0 7.2 7.7 7.9 230.4 7.43 21 4.4 457 .99 1.14 .99 .41 7.6 15 6.0 4.3 3.8 4.0 5.0 3.6 6.3 14 6.4 5.9 10 6.0 5.8 5.3 5.8 8.3 6.8 6.5 6.7 22 7.2 3.2 3.4 3.9 3.7 4.1 4.3 4.3 5.4 204.6 6.60 22 3.2 406 .88 1.02 4.7 4.4 16 12 8.5 7.0 128 20 6.2 3.7 3.3 3.6 26 6.9 11 6.0 4.6 15 6.2 5.3 4.8 4.4 72 e39 e7.2 eS.O 40 11 8.2 32 --- 522.0 17.4 128 3.3 1040 2.32 2.59 e Estimated 154 RIO PUERTO NUEVO BASIN 50048770 RIO PIEDRAS AT EL SENORIAL, PR—Continued WATER QUALITY RECORDS PERIOD OF RECORD.-- OCTOBER 1989 TO SEPTEMBER 1990 STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TORE (CFS) (UMHOS) (DEC C) NOV. DEC. JAN. FEB. MAR. 17 1403 18 1036 18 1025 06 1254 08 1245 APR. 03 1248 12.1 7 .41 7.68 6.08 5.40 5.03 326 374 395 408 408 397 28.0 24.5 24.5 28.0 28.5 33.0 DATE TIME MAY 16 1117 JUNE 12 0643 JULY 12 1318 AUG. 30 -- SEPT 26 1140 STREAMFLOW, INSTANTANEOUS (CFS) 7.94 5.33 5.28 4.09 3.58 SPECIFIC CON- TEMPERA- DUCTANCE TORE (UMHOS} (DEC C) 410 455 389 416 28.5 32.5 28.5 RIO PUERTO NXJEVO BASIN 50048770 RIO PIEDRAS AT EL SENORIAL, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORDS.-- Water years 1988 to current year. INSTRUMENTATION.-- USD-77 and automatic sediment sampler. PERIOD OF DAILY RECORD.-- SUSPENDED-SEDIMENT DISCHARGE: April 1988 to September 1990. EXTREMES FOR PERIOD OF DAILY RECORD.-- SEDIMENT CONCENTRATION: Maximum daily mean, 24,600 mg/L Sep. 18, 1989; Minimum daily mean, 2 mg/L November 18, 1988. SEDIMENT LOADS: Maximum daily mean, 96,700tons (88,OOOtonnes) Sep. 18, 1989; Minimum daily mean, 0.06 ton (0.05 tonne) MAY 6, 1990. 155 EXTREMES FOR WATER YEARS 1988-89-90.-- Water Suspended-sediment concentration (mg/L) Year maximum minimum Suspended-sediment discharge (tons per day) maximum minimum 1988 1989 1990 13,900 (Sep. 11) 24,600 (Sep. 18) 7,110 (Oct. 04) 40 (Jun. 08) 2 (Nov. 18) 5 (Jan. 06) 21,600 (Sep. 11) 96,700 (Sep. 18) 24,900 (Oct. 04) 1.3 (Aug. 06) .13 (Nov. 18) .06 (May 06) SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 DAY MEAN DISCHARGE (CFS) MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) APRIL MEAN DISCHARGE (CFS) MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) MAY MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) JUNE 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 10 9 8 9 8 8 9 9 8 8 10 13 9 153 82 23 34 84 61 21 15 13 11 20 13 11 9 8 8 7 - .8 .3 .0 .9 .3 .9 .5 .2 .0 . 1 .2 .3 .2 .9 -- 177 167 124 384 186 130 166 155 144 114 292 378 167 3690 4380 743 1700 2650 2600 520 311 265 213 598 390 215 151 155 153 102 ___ 5 4 2 12 4 2 4 4 4 2 13 45 5 7780 2180 77 790 1700 669 32 13 10 7 57 16 6 3 3 3 2 - .3 .9 .8 .6 .9 .9 .2 .8 .5 .5 .0 .7 .9 .4 .5 .2 -- 7, 7, 7, 7. 7, 7, 6, 6, 160 133 47 17 13 14 11 10 9, 9, 11 11 12 ell e7. e7, e6 9, 7, 8, 8, 9, 8, .8 .4 .3 .0 .2 .0 .7 .6 .5 ,5 .8 .0 .8 .1 .7 .1 .8 .7 .7 100 99 97 97 112 100 85 90 8850 6720 2180 373 244 284 170 165 160 148 155 155 155 e!50 e!50 e!50 e!50 168 102 142 146 174 136 2. 2. 1. 1. 2. 1. 1, 1. 13600 7010 492 18 8. 15 5. 4. 6. 3. 4. 4. 5. e4. e3. e2. e2. 5. 2. 5. 3. 5. 3. .1 ,0 .9 .9 .8 ,9 ,5 .6 .6 . 0 .5 ,1 ,9 ,6 .6 .0 ,5 .2 .8 ,8 ,1 ,1 ,3 ,8 ,1 ,2 8 8 7 7 7 7 7 7 7 7 11 13 10 9 14 9 8 8 8 14 37 12 9 15 9 8 7 8 7 6 .7 .1 .9 .6 .4 .2 .1 .0 .6 .2 .6 .6 .8 .7 .9 .0 .3 .4 .7 .8 .2 .8 144 109 107 93 69 248 42 40 93 99 193 218 195 159 331 153 120 146 155 304 1800 254 130 484 153 120 108 144 99 92 4. 2. 2. 1. 1. 4. 2. 1. 6. 7. 6. 4. 23 4. 2. 3. 5. 20 469 11 3. 77 4. 2. 2. 3. 1. 1. 4 4 3 9 4 8 80 76 1 9 9 6 2 5 0 9 8 9 2 2 7 2 9 9 7 TOTAL 696.6 13463.1 599.7 21230.9 304.6 684.36 e Estimated 156 MEAN DISCHARGE DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 (CFS) 15 10 8. 8. 13 9. 22 7. 7. 7. 7. 8. 11 18 7. 7. 36 25 12 7. 6. 13 10 9. 7. 8. 6. 8. 17 15 8. .0 .8 .7 ,3 8 6 ,7 ,4 9 2 9 9 0 8 3 6 0 1 RIO PUERTO NUEVO BASIN 50048770 RIO PIEDRAS AT EL SENORIAL, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) JULY 415 171 120 142 296 147 820 110 132 113 119 164 204 493 115 102 1580 923 217 120 99 310 170 163 130 146 94 100 586 486 131 360.0 44 4.9 2.6 3.7 18 4.0 146 2.2 3.2 2.5 2.6 4.2 8.8 46 2.2 2.0 404 126 8.0 2.6 1.8 22 4.6 6.4 3 .1 4.2 1.7 2.2 75 39 3.1 1000.6 MEAN DISCHARGE (CFS) MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) AUGUST 7, 6, 17 9, 6, 5, 13 6, 7, 53 17 9, 8, 16 10 20 21 12 8. 8. 8. 15 27 251 57 28 53 28 23 15 39 ,0 ,4 .2 ,7 .8 ,4 ,3 ,3 ,2 .7 .4 .1 122 86 490 143 88 80 507 97 119 2730 414 138 122 408 195 597 551 231 130 125 129 273 3670 9030 2700 848 2560 765 631 290 1570 2 , 1, 56 3, 1. 1. 119 1. 3. 1430 25 3. 2. 42 7. 73 38 8. 3, 2. 2, 15 1250 16800 490 70 578 64 48 12 411 ,3 ,5 ,6 ,6 ,3 ,7 ,6 ,5 ,7 .2 .0 ,1 ,8 ,8 MEAN DISCHARGE (CFS) 110 33 22 19 17 16 17 48 e70 27 237 68 30 e47 e45 e35 e25 e!8 e!9 e!4 ell e!30 e35 e20 e!7 e!3 e!2 elO e9.2 e9.0 MEAN CONCEN- TRATION (MG/L) SEPTEMBER 6090 1080 500 440 350 330 350 2390 e!550 821 13900 3360 840 e!760 e!600 el060 e660 e400 e430 e280 e!90 e8400 e!060 e460 e370 e250 e220 e!60 e!44 e!40 SEDIMENT DISCHARGE (TONS/DAY) 5910 111 30 23 16 14 16 694 e234 71 21600 833 72 e223 e!94 100 45 19 22 11 e5.6 e2950 elOO e25 e!7 e8.8 e7.1 e4.3 e3.6 e3.4 806.5 21565.00 1183.2 33362.8 e Estimated MEAN DISCHARGE DAY (CFS) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 e!3 e!2 el5 e20 e!2 elO e9. e!9 e!2 e30 11 9. 7. 8. 8. 7. 8. 8. 28 15 11 9. 7. 5. 32 35 7. 8. 21 16 12 ,0 ,0 .6 ,3 ,2 .8 .9 ,9 2 .3 .1 ,0 ,6 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) OCTOBER e250 e220 e310 e460 e220 e!60 e!50 e430 e220 e860 223 147 112 125 120 120 118 243 1060 323 150 156 100 60 3420 2000 249 194 718 423 267 e8. e7. e!3 e25 e7. e4. e3. e22 e7. e70 7. 3. 2. 2. 2. 2. 2. 6. 297 15 4. 5. 2. 1550 1030 6. 9. 187 52 17 8 1 1 3 6 1 8 8 3 9 7 5 8 2 5 2 0 82 0 7 RIO PUERTO NDEVO BASIN 50048770 RIO PIEDRAS AT EL SENORIAL, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY) , WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) NOVEMBER 157 14 12 10 9.3 14 13 12 26 15 13 27 65 98 67 30 21 120 32 16 14 19 10 9.2 7.9 10 11 8.1 7.1 7.0 7.3 74 40 35 33 164 160 245 808 311 190 920 484 5100 2150 905 6880 1210 2 325 318 468 175 155 115 173 260 170 115 90 100 2 1 8 5 8 64 13 6 57 93 7110 591 83 399 267 14 15 42 4 3 2 5 7 3 2 1 2 .8 .3 .94 .82 .4 .6 .9 .7 .13 .7 .9 .5 .9 .7 .7 .2 .7 .0 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) DECEMBER 7. 9. 9 9. 8. 7. 8. 7. 9. 7. 7. 6. 7. 8. 10 9. 22 9. 7. 6. 5. 20 9. 39 11 9. 6. 11 6. 33 8. 9 2 .6 5 4 8 7 5 9 8 5 7 7 5 1 4 9 8 9 1 7 3 8 7 110 88 68 48 30 28 28 27 152 27 105 88 100 120 131 135 757 225 170 118 78 754 212 2100 233 162 100 268 75 2690 140 2. 2. 1 1. . . 6. 2. 1. 2. 2. 3. 3. 102 5. 3. 2. 1. 152 11 897 8. 6. 1. 18 1. 966 3. 3 2 .8 2 68 58 66 54 0 54 1 5 1 8 5 3 7 6 2 2 3 2 7 4 3 428.9 3375.22 724.9 342.4 2211.40 e Estimated 158 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL RIO PUERTO NUEVO BASIN 50048770 RIO PIEDRAS AT EL SENORIAL, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN DISCHARGE (CFS) 5. 8. 5. 4. 4. 4. 7. 20 16 18 60 36 21 10 8. 8. 8. 7. 7. 25 11 7. 7. 7. 11 8. 7. 6. 7. 7. 7. 4 4 1 7 9 4 6 1 7 4 2 9 9 4 4 2 4 8 5 6 4 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) JANUARY 61 143 59 51 50 50 132 615 446 428 3070 1460 556 160 130 110 95 98 109 786 186 105 49 15 210 132 103 98 105 110 108 MEAN DISCHARGE (CFS) MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) MEAN DISCHARGE (CFS) FEBRUARY 6. 6. 70 35 30 1090 201 43 4. 2. 2. 2. 1. 2. 148 5. 2. 26 2. 2, 1, 2, 2. 2. ,88 , 0 ,82 ,64 , 66 , 60 ,0 ,3 , 8 . 6 ,2 .9 ,3 ,7 ,2 ,98 ,30 , 9 ,1 , 8 ,1 ,3 ,2 7 6 6 7 7 7 5 8 e!6 e6 e6 e5 e5 e5 e!8 e88 63 32 9 7 7 7 5 5 5 84 47 11 - - - .1 .7 .6 .0 .1 .9 .9 .0 .4 .0 .6 .6 .4 .6 .9 .1 .1 .1 .0 .3 -- -- -- 110 95 84 78 109 95 76 245 e340 e88 e80 e72 e72 e68 e400 e!670 3350 2690 130 85 65 50 38 35 32 3440 2280 123 ___ ___ ___ 2 1 1 1 2 2 1 5 e!5 el el el el el e!9 e532 791 619 3 1 1 4560 633 3 .1 .7 .5 .5 .3 .0 .2 .8 .5 .3 .1 .1 .0 .4 .8 .2 .96 .52 .48 .46 .7 ___ ___ ___ 11 8. 7. 8. 6. 7. 7. 7. 6. 34 6. 38 47 12 10 9. 11 11 6. 6. 6. 7. 7. 9. 12 16 41 11 8. 9. 10 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) MARCH 4 6 4 4 4 3 2 4 9 2 6 8 7 1 3 9 8 3 110 109 95 132 81 93 76 103 98 3010 105 2200 2260 205 185 145 195 254 60 79 109 99 98 108 108 108 1390 202 137 164 177 3 2 1 3 1 1 1 3 2 1360 2 1030 647 6 5 3 8 20 1 4 2 1 1 2 3 4 384 6 4 5 5 .3 .5 .9 .4 .4 .9 .5 .0 .0 .4 .6 .0 .6 .5 .1 .5 .0 .9 .9 .9 .5 .7 .5 .0 .1 .8 376.4 1697.28 7205.62 401.7 3531.9 e Estimated RIO PUERTO NUEVO BASIN 159 50048770 RIO PIEDRAS AT EL SENORIAL, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN DISCHARGE DAY (CFS) 1 26 2 12 3 12 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 9. 7. 6. 6. 6. 6. 6. 6. 6. 13 11 6. 6. 6. 5. 5. 5. 5. 5. 4. 4. 4. 4. 3. 102 55 10-- 6 5 8 3 2 2 6 0 1 0 4 1 2 2 1 2 0 4 2 1 2 6 - MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) APRIL 1220 405 206 6.8 267 11 96 96 91 82 82 78 80 82 72 302 289 80 70 62 84 75 61 60 50 280 43 40 39 36 8360 2580 182 1. 1. 1. 1. 1. 1. 1. 1. 1. 23 48 1. 1. 1. 1. 1. 3. . 11300 2040 6. - 9 9 6 4 4 3 4 3 2 3 2 0 2 1 84 84 68 3 48 44 44 34 6 -- MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) MAY 22 1380 532 20 699 205 6.5 85 1.7 14 6, 6, 11 6 7 6, 6. 5, 5, 4. 4. 4, 4. 4, 5 6, 5, 5, 6, 5, 3 , 3, 6, 2, 9, 4. 69 .6 .9 .0 .4 .0 .7 .3 .6 .9 .8 .8 .8 .8 .3 .1 .8 .3 .1 ,4 .6 .8 .9 .7 .8 .0 556 99 65 253 32 23 22 121 58 76 51 53 55 68 52 68 65 65 62 85 51 38 49 176 21 879 81 8210 87 1, 1, 15 2. 1, 1. 1. 1. 1. 22 199 1, 4060 .9 ,1 ,52 ,46 ,36 ,5 ,82 ,3 ,68 ,68 .72 .0 .68 ,98 ,1 ,0 ,88 ,5 ,74 .36 .67 .16 ,3 MEAN DISCHARGE (CFS) 50 96 249 89 13 4. 3. 3. 2. 2. 20 8. 9. 8. 7. 7. 66 15 7. 6. 7. 12 7. 7. 7. 7. 5. 6. 7. 7. -- 7 1 4 3 1 3 7 2 8 4 6 3 0 2 3 6 3 8 8 5 5 - MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) JUNE 2800 870 3730 3250 12900 21200 4060 257 53 35 29 19 11 1910 110 99 97 105 109 3380 424 108 88 85 442 90 98 111 115 28 9 54 116 ___ 3390 13 . 491 2. 2. 2. 2. 2. 3340 25 2. 1. 2. 82 1. 1. 2. 2. . 1. 2. - 68 30 26 12 06 5 6 1 2 2 2 5 1 7 9 3 7 44 16 5 5 -- TOTAL 367.0 13866.96 281.9 5143.11 744.9 32693.02 160 RIO PUERTO NUEVO BASIN 50048770 RIO PIEDRAS AT EL SENORIAL, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN MEAN DISCHARGE DAY (CFS) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL YEAR 7. 25 11 8. 7. 9. 41 18 12 9. 331 34 95 20 6. 5. 7. 63 7. 6. 7. 9. 8. 4. 4. 5. 32 6. 4. 5. 9. 823. 7617. 7 5 6 7 0 2 2 0 9 5 2 0 4 6 8 8 3 0 8 9 1 2 CONCEN- TRATION (MG/L) JULY 113 1070 195 146 103 140 2070 426 222 162 11300 1200 4650 577 61 73 164 2320 88 62 60 194 163 57 50 58 2030 106 45 106 304 __. SEDIMENT DISCHARGE (TONS /DAY) 2. 200 6. 3. 2. 4. 585 24 8. 3. 41600 195 3560 57 1. 1. 15 2480 1. 1. 1. 5. 10 1410 2. 9. 22 50216. 281295. .3 ,9 .9 , 1 .4 . 1 .8 .0 .2 . 9 . 1 ,2 .7 .70 . 64 .90 .2 .48 ,7 .22 .24 MEAN DISCHARGE (CFS) 4. 4 . 8. 4 . 23 4. 26 5. 3. 44 12 7. 9. 6. 27 14 63 54 65 44 33 15 27 23 113 23 39 10 97 26 12 .7 ,3 ,0 ,0 ,7 ,6 ,7 .1 .7 ,4 MEAN CONCEN- TRATION (MG/L) AUGUST 300 107 218 50 801 70 1200 82 20 2470 253 98 241 85 1280 502 2950 2370 2980 1720 1070 309 756 767 5430 625 1800 40 5000 737 192 SEDIMENT DISCHARGE (TONS /DAY) 3 1 32 540 400 1 923 16 1 30 1 638 80 1930 1000 1090 509 441 26 191 141 6120 43 846 1 3120 79 6 .8 .3 .54 .88 .5 .20 .9 .5 .1 .0 MEAN DISCHARGE (CFS) 11 18 16 10 9.9 9.5 65 58 15 100 54 21 26 18 50 38 43 610 39 33 51 17 88 78 18 13 154 31 17 75 --- MEAN CONCEN- TRATION (MG/L) SEPTEMBER 242 582 450 229 174 48 2050 2720 397 5630 1790 461 955 422 2670 1620 1770 24600 345 1030 2360 78 5050 3690 345 231 6680 304 28 3760 --- SEDIMENT DISCHARGE (TONS/DAY) 8.6 116 43 6.1 5.1 1.2 2500 1410 22 5440 576 42 157 23 1250 351 304 96700 58 289 1210 5.4 2550 1540 17 8.2 16600 39 1.3 3050 --- 848.2 18213.72 1786.4 134322.9 DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN DISCHARGE (CFS) RIO PUERTO NOEVO BASIN 161 50048770 RIO PIEDRAS AT EL SENORIAL, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) OCTOBER 41 316 52 60 84 33 24 29 24 22 20 19 19 19 56 26 17 14 38 25 26 96 47 42 39 37 35 29 16 39 46 376 7110 569 1780 1190 317 190 260 195 164 146 130 124 120 821 209 134 95 1110 236 205 1860 877 43 33 30 27 22 20 2950 1280 43 24900 97 910 1400 30 12 25 13 9. 7. 6. 6. 6. 495 23 6. 3. 457 15 15 3480 217 5. 3. 3. 2. 1. 1010 594 ,7 , 9 , 6 ,5 2 ,3 ,7 ,0 ,4 .0 ,5 ,8 ,93 MEAN DISCHARGE (CPS) MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) MEAN DISCHARGE (CPS) NOVEMBER 55 17 13 13 15 14 14 28 45 43 13 13 13 20 25 22 18 11 16 12 10 9.1 9.2 7.7 8.6 6.6 10 19 18 17 ___ 4740 2400 915 58 100 93 96 521 1400 698 88 70 68 1350 280 70 109 42 189 85 28 23 20 19 19 20 22 21 20 83 ___ 1400 117 33 2 4 4 5 122 766 410 3 2 2 82 25 4 12 1 20 4 1 3 .0 .6 .9 .5 .5 .3 .2 .1 .4 .2 .74 .57 .46 .39 .43 .36 .66 .1 .95 .8 ___ 20 e!8 e!5 e!2 e7 e7 e7 e8 e7 e7 e8 e8 e8 e9 e8 e!8 e!2 e8 7 7 7 7 7 7 7 7 7 11 e72 e8 e60 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) DECEMBER .6 .7 .9 .3 .6 .6 .2 .0 .2 .0 .4 .0 .7 .4 . 1 . 1 .0 .7 .8 .4 . 1 .0 90 e90 e90 e70 e33 e33 e39 e40 e33 e33 e51 e35 e32 e30 e40 el!4 e47 e28 24 18 13 10 10 49 64 58 42 281 e6360 e29 e!270 4. e4. e3. e2. e. e. e. e. e. e. el. e. e. e. e. e5. el. e. 1. 1. 1. 185 e2740 e. e206 5 4 6 3 68 68 84 90 68 68 1 76 71 71 90 5 5 59 50 35 24 20 20 5 7 1 81 62 1390 33799.53 535.2 3031.16 3169.25 e Estimated 162 RIO PUERTO NUEVO BASIN 50048770 RIO PIEDRAS AT EL SENORIAL, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN DISCHARGE DAY (CFS) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 e!5 ell e!9 18 12 8. 7. 8. 6. 7. 8. 6. 6. 8. 8. 8. 10 8. e20 e28 e90 e!7 e26 e37 e!5 e!2 ell e!5 e23 e!8 el4 .0 ,9 ,2 ,9 ,0 .6 ,5 5 ,7 ,9 ,3 ,6 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) JANUARY 60 42 13 10 10 10 10 9 14 5 31 21 19 28 34 39 52 36 e!50 e230 el!30 e!20 e210 e334 e22 e70 e60 elOO e213 e!70 e90 2. 1. 1. 2. 2. 1. e8. e!7 e275 e5. e!5 e33 e. e2. el. e4. e!3 e8. e3. ,4 .2 .64 ,49 .29 .23 ,21 ,23 ,27 ,09 83 41 34 71 0 1 2 1 1 5 90 3 8 1 3 4 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) FEBRUARY MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) {MG/L) (TONS/DAY) MARCH e!3 ell e9 e!2 e8 e6 elO e!3 e!8 e!6 elO e7 e!2 e50 e6 e8 e7 ell elO e6 e8 e!4 elO e7 e8 ell e!2 e!6 - - - .6 .0 .4 .0 .5 .3 .9 .0 .2 .3 .0 -- -- -- 51 42 35 46 28 19 38 51 114 78 38 24 46 900 54 28 28 42 38 29 29 55 38 25 28 42 47 78 __- ___ ___ 1 1 1 1 1 5 3 1 1 122 1 1 2 1 1 1 3 .8 .2 .90 .5 .60 .32 .0 .8 .5 .4 .0 .46 .5 .94 .62 .60 .2 .0 .46 .64 .1 .0 .50 .60 .2 .5 .4 ___ ___ __- e!7 e7. e6. e6. e6. e6. e5. e5. e23 elO ellO e80 elOO e40 e!5 e35 e!3 elO ell e9. e6. e9. e6. e6. e5. e7. ell e7. 12 8. 7. .9 .6 .0 .4 .0 .6 .5 ,0 ,0 8 4 4 6 0 8 1 5 e82 e28 e20 e!9 e20 e!9 e!7 e!7 e213 e38 e4410 e2000 63900 6300 e60 e!70 e51 e38 e42 e33 e!9 e90 e90 e88 e85 e75 e42 e28 47 30 21 63 e e e e e e e e!3 el e!310 e432 61050 e32 62 ell el el el e. e e 2 el el el el el e 1 .8 .60 .36 .30 .34 .30 .26 .26 .0 .4 .8 .0 .2 80 .30 .4 .6 .5 .3 .4 .2 .58 .5 .73 .46 505.1 402.14 332.2 158.74 604 . 6 2875.39 e Estimated )AY 1 2 3 4 S 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN DISCHARGE (CFS) 6.6 6.2 5.1 4.9 5.7 5.0 6.8 5.5 5.9 5.8 5.7 6.4 32 24 8.4 7.4 17 17 20 31 9.4 9.5 9.7 8.9 64 16 8.8 6.7 7.9 8.3 ___ RIO PUERTO NUEVO BASIN 163 50048770 RIO PIEDRAS AT EL SENORIAL, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) APRIL 22 15 10 14 22 14 40 14 22 19 18 24 1080 518 33 23 864 352 292 819 29 19 18 17 1230 221 21 24 36 50 .42 .32 .15 .18 .42 .18 .67 .21 .44 .31 .26 .64 451 177 .83 .49 270 132 81 320 .76 .47 .47 .40 1800 375.6 44 .49 .46 1.1 1.7 3286.37 MEAN DISCHARGE (CFS) 7 8 7 5 4 4 4 9 77 19 27 11 16 18 10 7 11 8 9 7 7 8 9 8 8 7 5 4 4 6 5 348 .0 .0 .2 .4 .6 .7 .3 .5 .9 .2 .8 .8 .0 .0 .2 .6 .2 .4 .8 . 9 .9 .1 .4 .9 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) MAY 27 37 27 12 10 10 12 74 2230 197 2240 64 163 224 49 26 41 29 39 26 23 30 36 33 32 719 14 10 8 7 7 ___ 8 2800 12 475 3 20 20 1 1 1 1 13 3365 .80 .98 .75 .18 .14 .06 .15 .9 .0 .9 .54 .2 .63 .2 .53 .45 .72 .1 .93 .88 .22 .13 .11 .12 .10 .72 MEAN DISCHARGE (CFS) 22 9. 13 22 27 8. 7. 6. 6. 7. 6. 5. 5. 14 16 7. 6. 5. 6. 5. 4. 5. 5. 5. 6. 5. 5. 5. 5. 5. -- 262. 9 7 3 2 6 2 2 3 2 7 0 9 5 3 8 6 5 9 0 7 2 2 2 2 - 3 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) JUNE 1200 38 162 469 813 150 29 17 15 24 22 16 14 193 119 25 13 10 30 20 16 13 11 10 10 10 21 10 11 16 --- ___ 438 1.2 32 97 216 4.0 .57 .30 .28 .60 .38 .24 .18 39 9.1 .57 .22 .16 .64 .31 .20 .17 .15 .18 .15 .15 .38 .16 .14 .29 ___ 842.72 164 RIO PUERTO NDEVO BASIN 50048770 RIO PIEDRAS AT EL SENORIAL, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL YEAR 5, 5. 5. 5, 16 6. 13 6, 9, 5, 4, 4. 4. 6. 5. 5. 9. 11 5. 4. 5. 5. 6. 21 7. 8. 6. 8. 7. 7. 7. 230. 5719. ,1 ,1 ,7 .6 ,2 ,1 ,5 ,7 ,8 .4 ,7 ,1 .2 ,2 .1 ,6 ,7 ,5 5 ,7 .1 ,2 , 8 ,0 2 7 9 4 7 JULY 11 10 9 9 200 23 168 49 132 20 10 9 14 18 15 16 63 117 9 10 21 13 25 400 18 60 19 29 25 29 34 --- .15 .13 .14 .14 27 .42 24 .81 17 .40 .14 .10 .21 .28 .21 .23 4.1 11 .14 .12 .54 .20 .64 76 .38 4.9 .36 .74 . 68 .75 .78 172.69 62810. 57 MEAN DISCHARGE (CFS) 7 15 6 4 3 4 5 3 6 14 6. 5 10 6 5 5 5 8, 6 6 6, 22 7 3 3, 3, 3, 4, 4, 4 , 5. 204 , .6 .0 .3 .8 .0 .0 .6 .3 .4 .9 .0 .8 .3 .8 .3 .8 .5 .7 .2 .2 .4 .9 .7 , 1 .3 .3 .4 .6 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) AUGUST 7 15 6 4 3 4 5 3 6 14 6. 5 10 6 5 5 5, 8, 6 6 6, 22 7 3, 3, 3, 3, 4, 4, 4 , 5. .6 .0 .3 .8 .0 .0 .6 .3 .4 .9 .0 .8 .3 .8 .3 .8 .5 .7 .2 .2 .4 .9 ,7 , 1 .3 .3 .4 22 267 41 39 34 24 27 12 27 280 15 14 169 22 10 9 8 46 22 21 20 776 663 268 148 64 42 18 10 9 20 .48 57 .63 .44 .35 .25 .73 .11 .97 73 .27 .24 15 .49 .15 .12 .13 2.7 .39 .33 .38 100 16 2.2 1.3 .60 .43 .16 .11 .10 .40 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) SEPTEMBER 4. 4. 16 12 8. 7. 128 20 6. 3. 3. 3. 26 6. 11 6. 4. 15 6. 5. 4. 4. 72 e39 e7. e5. 40 11 8. 32 7 4 5 0 2 7 3 6 9 0 6 2 3 8 4 2 0 2 15 10 295 180 218 16 3810 546 39 22 17 14 3530 27 113 21 15 269 138 51 40 16 1410 e358 e33 e22 1630 71 20 1050 78 22 6. 6720 47 1070 . 15 26 2. . 2020 e38 e. e. 908 2. 470 19 11 5 34 75 24 15 13 62 36 20 8 81 46 20 64 27 2 43 275.46 522.0 11431.40 e Estimated RIO PUERTO NUEVO BASIN 50048770 RIO PIEDRAS AT EL SENORIAL, PR—Continued WATER QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1990 PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT 165 DATE APR 1988 14. .. 15. .. 18. .. MAY 09. .. AUG 23. .. 24... 24. . . OCT 25. . . 29. .. NOV 14. .. DEC 30. . . JAN 1989 20. . . FEB 26. .. MAR 10. .. 27. . . 27. . . APR 1988 14. .. 15. . . 18. . . MAY 09. .. AUG 23. .. 24. .. 24. . . OCT 25. .. 29. . . NOV 14. .. DEC 30. . . JAN 1989 20. .. FEB 26. . . MAR 10. . . 27. . . 27. . . TIME 2115 0020 1825 1300 1805 1400 1425 1355 1610 1630 0330 1610 1720 1255 1250 1510 SED. SUSP. FALL DIAM. PERCENT FINER THAN 016 MM 74 76 69 67 62 63 45 65 59 44 57 34 50 47 61 32 DIS- CHARGE, INST. CUBIC FEET PER SECOND 184 355 190 411 142 232 945 221 180 344 170 161 899 230 67 220 SED. SUSP. FALL DIAM. PERCENT FINER THAN .031 MM 85 90 79 77 78 71 55 79 71 51 69 48 66 64 73 42 SEDI- MENT, SUS- PENDED (MG/L) 26100 26000 23100 60637 45427 32045 28845 37279 4968 5279 37107 10644 53703 38352 5115 6884 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN . 062 MM 94 95 91 84 86 77 64 80 72 58 78 59 71 73 83 52 SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) 13000 24900 11800 67289 17400 20100 73600 22200 2410 4903 16731 4630 130000 23830 925 4090 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .125 MM 98 98 94 92 94 87 77 91 84 69 90 77 83 86 89 75 SED. SUSP. FALL DIAM. PERCENT FINER THAN . 002 MM 32 34 29 29 20 27 19 28 21 15 22 8 17 17 24 9 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .250 MM 100 100 100 98 98 95 93 98 95 85 98 95 95 96 95 94 SED. SUSP. FALL DIAM. PERCENT FINER THAN .004 MM 45 47 41 43 35 35 28 39 45 24 34 15 27 27 33 12 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .500 MM 100 100 100 100 100 100 99 100 100 98 100 100 99 100 100 100 SED. SUSP. FALL DIAM. PERCENT FINER THAN . 008 MM 61 62 54 54 45 51 37 53 43 35 44 24 35 37 -- 21 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN 1.00 MM 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 166 RIO PUERTO NOEVO BASIN 50048770 RIO PIEDRAS AT EL SENORIAL, PR—Continued WATER QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1990 PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT DATE APR 1989 28.. . MAY 01. . . 29. . . 31. . . JUN 01. . . 02. .. 02.. . JUL 18. .. 27. .. AUG 05. .. 17. .. SEP 07. .. OCT 30.. . NOV 09. .. DEC 29.. . JUN 1990 01. . . SEP 07. .. 13. .. 27. .. DATE APR 1989 28. . . MAY 01. . . 29. .. 31.. . JUN 01. . . 02. .. 02. .. JUL 18.. . 27. .. AUG 05... 17.. . SEP 07. .. OCT 30. . . NOV 09. . . DEC 29. . . JUN 1990 01. . . SEP 07.. . 13. .. 27. .. TIME 1445 1200 1320 1150 1532 1255 1350 1550 1530 1945 1020 1735 1250 1325 0010 1710 1335 1425 1340 SED. SUSP. FALL DIAM. PERCENT FINER THAN .016 MM 48 53 65 40 28 20 28 51 49 50 43 35 61 60 57 61 51 70 56 DIS- CHARGE, INST. CUBIC FEET PER SECOND 481 269 130 333 70 944 422 673 439 431 358 536 359 376 362 317 612 209 275 SED. SUSP. FALL DIAM. PERCENT FINER THAN .031 MM 56 62 80 51 36 24 36 61 67 61 52 43 75 73 72 77 66 84 77 SEDI- MENT, SUS- PENDED (MG/L) 44500 32100 24800 42500 4970 30800 8310 24275 19985 10070 19000 34300 27700 18000 30000 15200 20800 16200 58500 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .062 MM 62 72 84 57 41 32 41 70 72 67 61 50 83 81 81 89 83 97 89 SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) 57800 23300 8700 38200 939 78500 9470 44100 23700 11700 18400 49600 26800 18300 29300 13000 34400 9100 43400 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .125 MM 75 82 93 65 60 41 56 79 80 80 75 64 92 90 91 94 93 99 92 SED. SUSP. FALL DIAM. PERCENT FINER THAN .002 MM 18 21 23 14 11 7 9 19 14 17 17 14 31 24 20 19 17 -- 21 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .250 MM 94 96 100 96 84 68 85 90 94 93 91 84 98 97 98 98 98 100 99 SED. SUSP. FALL DIAM. PERCENT FINER THAN .004 MM 26 31 35 21 16 11 14 29 23 28 24 20 35 36 31 29 23 38 31 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .500 MM 100 100 100 100 95 95 98 98 100 98 100 98 100 100 100 100 100 100 100 SED. SUSP. FALL DIAM. PERCENT FINER THAN .008 MM 34 40 48 28 21 15 19 39 32 36 32 26 46 47 44 43 38 52 40 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN 1.00 MM 100 100 100 100 98 100 100 100 100 100 100 100 100 100 100 100 100 100 100 RIO PUERTO NUEVO BASIN 167 50048800 RIO PIEDRAS NEAR RIO PIEDRAS, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°22'15", long 66°03'40", at bridge on Winston Churchill Avenue in the El Senorial Housing area, 0.5 mi (0.8 km) west of Highway 176, and 2.5 mi (4.0 km) southwest of Rio Piedras plaza. DRAINAGE AREA.--8.17 mi j (20.9 km") . PERIOD OF RECORD.—Water years 1972 to current year. WATER QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 12. .. DEC 12. .. FEB 1990 07. .. APR 16. .. JUN 19. .. AUG 14. .. TIME 1125 1040 1105 0850 1250 1205 DIS- CHARGE, INST. CUBIC FEET PER SECOND 16 8.1 7.7 7.4 6.8 7.1 SPE- CIFIC CON- DUCT- ANCE (US/CM) 389 451 457 485 466 473 PH (STAND- ARD UNITS) 7.80 7.30 7.20 7.60 7.10 7.60 TEMPER- ATURE WATER (DEG C) 27.0 24.5 22.5 24.5 31.0 32.0 TUR- BID- ITY (NTU) 8.5 3.3 2.5 3.7 12 18 OXYGEN, DIS- SOLVED (MG/L) 7.8 4.4 3.5 5.3 3.2 3.2 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 97 52 40 63 42 43 OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 26 36 46 48 94 91 COLI- FORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) K73000 K610000 K60000 K1200000 K920000 120000 STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) 51000 K140000 K130000 360000 270000 260000 DATE OCT 1989 12. .. DEC 12. .. FEB 1990 07. .. APR 16. . . JUN 19. . . AUG 14. .. HARD- NESS TOTAL (MG/L AS HARD- NESS NONCARB WH WAT TOT FLD MG/L AS CACO3 CALCIUM DIS- SOLVED (MG/L AS CA) MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) SODIUM, DIS- SOLVED (MG/L AS NA) 130 0 34 12 25 150 2 39 12 30 140 0 38 11 33 SODIUM AD- SORP- TION RATIO ALKA- POTAS- LINITY CHLO- SIUM, WAT WH SULFATE RIDE, DIS- TOT FET SULFIDE DIS- DIS- SOLVED FIELD TOTAL SOLVED SOLVED (MG/L MG/L AS (MG/L (MG/L (MG/L AS K) 0.9 3.1 1 4.6 1 3.8 CACO3 130 160 160 190 180 150 AS S) AS SO4) AS CL) <0.5 18 <0.5 15 31 25 32 37 DATE OCT 1989 12.. . DEC 12.. . FEB 1990 07.. . APR 16. .. JUN 19. .. AUG 14. .. FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.10 -- -- 0.10 -- 0.40 SILICA, DIS- SOLVED (MG/L AS SIO2) 31 -- -- 33 -- 28 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 226 -- -- 243 -- 272 SOLIDS, DIS- SOLVED (TONS PER DAY) 10.0 -- -- 4.48 -- 5.21 RESIDUE TOTAL AT 105 DEG. C, SUS- PENDED (MG/L) 11 19 10 20 15 44 NITRO- GEN, NITRATE TOTAL (MG/L AS N) 0.69 0.15 0.34 0.54 0.16 0.25 NITRO- GEN, NITRITE TOTAL (MG/L AS N) 0.11 0.05 0.06 0.06 0.04 0.05 NITRO- GEN, NO2+NO3 TOTAL (MG/L AS N) 0.80 0.20 0.40 0.60 0.20 0.30 NITRO- GEN, AMMONIA TOTAL (MG/L AS N) 0.69 3.8 2.8 5.9 2.2 2.0 NITRO- GEN, ORGANIC TOTAL (MG/L AS N) 0.81 1.2 1.3 0.0 3.9 4.3 K = non-ideal count 168 RIO PUERTO NUEVO BASIN 50048800 RIO PIEDRAS NEAR RIO PIEDRAS, PR—Continued WATER QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 12... DEC 12... FEB 1990 07.. . APR 16.. . JUN 19.. . ADG 14.. . DATE OCT 1989 12.. . DEC 12. .. FEB 1990 07. .. APR 16. .. JUN 19. .. ADG 14. .. DATE JUN 1990 19. .. DATE JUN 1990 19. .. DATE JUN 1990 19. . . NITRO- CHRO- GEN/AH- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS N03) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) 1.5 2.3 10 0.34 <1 <100 10 <1 <1 <10 5.0 5.2 23 0.93 4.1 4.5 20 0.93 1.5 2.1 9.3 1.1 1 100 40 <1 <1 20 6.1 6.3 28 1.8 6.3 6.6 29 1.5 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MM) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) 600 4 120 <0.10 <1 <1 20 <0.010 1 0.07 -- -- 1400 3 280 0.10 <1 <1 20 <0.010 4 0.23 __ __ PESTICIDE ANALYSES CHLOR- DI- DI- ENDO- PCB, ALDRIN, DANE, ODD, DDE, DOT, AZINON, ELDRIN SULFAN, TIME TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) 1250 <0.1 <0.010 <0.1 <0.010 <0.010 <0.010 0.15 <0.010 <0.010 HEPTA- METH- METHYL METHYL HEPTA- CHLOR MALA- OXY- PARA- TRI- ENDRIN, ETHION, CHLOR, EPOXIDE LINDANE THION, CHLOR, THION, THION, MIREX, TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) <0.010 <0.01 <0.010 <0.010 0.010 0.06 0.01 <0.01 <0.01 <0.01 NAPH- THA- LENES, PARA- POLY- PER- TOX- TOTAL THION, CHLOR. THANE APHENE, TRI- 2,4-D, 2,4,5-T 2, 4-DP SILVEX, TOTAL TOTAL TOTAL TOTAL THION TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) <0.01 <0.10 <0.1 <1 <0.01 0.06 <0.01 <0.01 <0.01 RIO PUERTO NUEVO BASIN 50049000 RIO PIEDRAS AT RIO PIEDRAS, PR LOCATION.--Lat 18°23'48", long 66°03'24", Hydrologic Unit 21010005, on left bank, at bridge on Highway 1, 0.3 mi (0.5 km) southwest of the plaza in Rio Piedras, and 0.4 mi (0.6 km) downstream from diversion for water supply. 169 DRAINAGE AREA.--12.5 mi 1 (32.4 km 1 )- WATER-DISCHARGE RECORDS PERIOD OF RECORD.--October 1958 (maximum discharge measurement only), 1959-64 (annual low-flow measurements only), July 1971 to September 1982, October 1987 to current year. GAGE.--Water-stage recorder. Elevation of gage is 50 ft (15.2 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharge, which are poor. Low flow affected by diversions for water supply. Gage-height and precipitation satellite telemetry at station. AVERAGE DISCHARGE.--14 years (1972-82,1988-90), 27.2 ftVs (0.770 m3 /s) , 31.72 in/yr (806 mm/yr), 21,160 acre-ft/yr (26.1 hmVyr); median of yearly mean discharges, 26 ft 3/s (0.74 m3 /s), 18,800 acre-ft/yr (23 hm3 /yr) . EXTREMES FOR PERIOD OF RECORD.--Maximum discharge 10,000 ft3 /s (283 m3 /s). Dec. 11, 1975, gage height, 21.02 ft (6.407 m) , from rating curve extended above 3,000 ft3/s (85.0 mVs) on basis of slope-area measurements; minimum daily discharge, 0.26 ft3 /s (0.007 m3 /s). May 19, 1977. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 2,800 ft3 /s (79.3 m3/s) and maximum (*): Date Oct. 2 Oct. 22 Apr. 25 Time 1400 1345 1250 Discharge (ft3/s) (m3/s) *3, 870 3,440 2,770 110 97.4 78.4 Gage height (ft) (m) *10.39 9.78 8.73 3.167 2.981 2.661 Date May Sept. 9 7 Time unknown 1520 Discharge (ft3 /s) (m3 /s) 3,380 3,380 95.7 95.7 Gage height (ft) (m) 9.68 9.69 2.950 2.954 Minimum discharge, 5.2 ft3/s (0.147 m3/s), Aug. 17. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES NOV JAN MAR JUN JUL 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC-FT CFSM IN. CAL YR WTR YR 48 502 59 74 165 36 28 66 28 24 23 22 24 36 168 30 22 19 36 26 26 270 41 35 32 31 30 28 23 61 50 2063 66.5 502 19 4090 5.32 6.14 1989 1990 87 24 20 21 27 21 23 31 131 67 25 22 21 29 29 25 42 19 26 34 18 17 17 16 17 17 18 21 21 21 --- 907 30.2 131 16 1800 2.42 2.70 TOTAL 16838 TOTAL 9945. 22 21 20 18 14 14 14 15 16 17 17 16 15 15 14 21 16 16 15 14 14 16 15 16 17 18 16 20 152 19 173 806 26.0 173 14 1600 2.08 2.40 .7 MEAN 8 MEAN 30 22 23 20 17 14 14 14 15 13 16 12 12 14 17 19 22 40 20 91 14 13 23 19 11 9.4 8.8 13 17 14 13 600.2 19.4 91 8.8 1190 1.55 1.79 46.1 MAX 27.2 MAX 10 10 11 9.7 9.0 8.6 13 16 20 16 12 11 11 58 10 12 10 15 15 9.8 11 16 12 10 11 13 16 19___ ___ --- 395.1 14 .1 58 8.6 784 1.13 1. 18 1580 MIN 502 MIN 20 17 19 23 23 21 17 17 33 17 205 87 181 32 20 41 18 14 15 13 9.6 12 12 14 15 19 22 14 15 14 12 991. 6 32. 0 205 9.6 1970 2.56 2.95 4.6 AC-FT 6.6 AC-FT 10 9.5 8.7 8.3 8.2 8.3 8.8 7.9 7.8 7.9 7.9 8.4 27 19 13 13 25 98 37 49 13 14 12 13 218 34 15 13 13 12--- 739.7 24.7 218 7.8 1470 1. 97 2.20 33400 19730 8.4 14 13 11 9.6 9.1 7.8 e20 e250 eSO 34 24 42 33 19 14 18 13 13 11 11 12 12 12 12 12 11 11 10 11 11 738.9 23. 8 250 7. 8 1470 1.91 2.20 CFSM 3. 69 CFSM 2 . 18 38 14 15 27 163 21 17 16 15 24 12 12 13 43 43 16 15 14 14 12 12 12 12 19 14 11 13 12 12 17 --- 678 22.6 163 11 1340 1.81 2.02 IN. 50, IN. 29, 14 11 11 14 23 13 18 11 33 12 8.1 7.8 8.6 9.4 8.6 7. 8 25 46 9.5 8.7 11 10 11 82 15 15 28 13 12 11 10 517.5 16.7 82 7.8 1030 1.34 1.54 .11 .60 10 21 9.5 8.4 14 8.4 14 7.3 8.1 29 9.7 8.9 28 9.0 6.8 6.8 7.8 10 7.4 7.5 7.5 67 8.5 6.8 20 7.9 8.3 8.1 8.5 6.8 7.9 388.9 12.5 67 6.8 771 1.00 1.16 7.8 8.1 34 99 24 6.6 315 18 12 10 11 8.8 63 11 20 13 11 34 12 12 9.6 11 139 67 18 11 49 13 11 61--- 1119.9 37.3 315 6.6 2220 2.99 3.33 Estimated 170 RIO PUERTO NUEVO BASIN 50049000 RIO PIEDRAS AT RIO PIEDRAS, PR—Continued WATER QUALITY RECORDS PERIOD OF RECORD.-- OCTOBER 1989 TO SEPTEMBER 1990 STREAMFLOW, DATE TIME INSTANTANEOUS (CFS) SPECIFIC CON- TEMPERA- DUCTANCE TURE (UMHOS) (DEG C) NOV. DEC. JAN. FEB. MAR. APR. 20 0943 14 0943 05 1127 02 0848 09 1112 04 0922 17.7 16.8 19.1 10.5 97.7 9.48 428 416 343 444 245 454 25.0 23.5 25.5 23.5 25.0 25.0 DATE TIME MAY 11 1058 JUNE 12 0756 JULY 11 1238 AUG. 27 1133 SEPT 21 1225 STREAMFLOW, INSTANTANEOUS (CFS) 16.3 9.67 8.82 9.15 9.97 SPECIFIC CON- TEMPERA- DUCTANCE TURE (UMHOS) (DEG C) 408 470 406 470 441 28.0 30.5 29.5 29.0 RIO PUERTO NUEVO BASIN 50049000 RIO PIEDRAS AT RIO PIEDRAS, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORDS.-- Water years 1988 to current year. INSTRUMENTATION.-- USD-77 and automatic sediment sampler. PERIOD OF DAILY RECORD.-- SUSPENDED-SEDIMENT DISCHARGE: October 1988 to September 1990. EXTREMES FOR PERIOD OF DAILY RECORD.-- SEDIMENT CONCENTRATION: Maximum daily mean, 13,000 mg/L Sep. 18, 1989; Minimum daily mean, 4 mg/L June 4, 1990. SEDIMENT LOADS: Maximum daily mean, 165,000 tons (150,200 tonnes) Sep. 18, 1989; Minimum daily mean, 0.12 ton (0.11 tonne) June 28, 1990. 171 EXTREMES FOR WATER YEARS 1988-89-90.-- Water Year 1988 1989 1990 Suspended-sediment concentration (mg/L) maximum minimum Suspended-sediment discharge (tons per day) maximum minimum DAY 4,670 (May 09) 13,000 (Sep. 18) 3,600 (Dec. 29) 8 (Feb. 26) 9 (several days) 4 (Jun. 28) 39,900 (May 09) 165,000 (Sep. 18) 15,100 (Oct. 02) .38 (Nov. 10) .16 (May 19) .12 (Jun. 28) SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN DISCHARGE (CFS) MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) OCTOBER 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL e!4 e!8 e50 e30 e70 e25 e!8 e!7 el8 e!6 e!6 e!5 e!4 e!4 e25 e30 e50 e40 21 15 28 14 25 36 59 18 15 21 18 15 19 784 18 17 138 64 137 225 406 94 70 113 80 70 80 1.0 .68 36 2.4 20 53 125 5.0 2.8 9.6 3.9 2.8 4.1 MEAN DISCHARGE (CFS) 18 15 17 17 14 16 15 18 15 13 13 13 30 13 15 55 42 16 11 9.1 8.6 38 172 86 133 445 84 31 18 1398.8 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) MEAN DISCHARGE (CFS) MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) 55 23 13 13 12 12 12 59 25 11 11 11 167 55 30 84 411 379 81 51 35 30 278 1630 641 1170 3990 516 171 88 2 4 1 37 2 22 77 71 4 1 64 1500 301 1130 6860 276 16 4 .7 .94 .52 .60 .46 .52 .48 .4 .0 .38 .38 .38 .7 .66 .7 .7 .86 .70 .4 10382.48 103 55 21 14 54 35 316 e290 e30 e25 e22 e20 e!9 17 54 20 15 13 32 123 84 35 27 24 26 53 34 30 23 22 104 1740 DECEMBER 976 391 454 70 395 198 3750 e2510 e225 e!30 el!2 elOO e94 70 354 90 73 65 176 1080 592 171 122 118 135 330 199 164 135 123 847 2380 164 29 2.6 187 28 10200 e7280 e48 e8.8 e6.7 e5.4 e4.8 3.2 119 4.9 3.0 2.3 29 817 306 18 8.9 7.9 10 81 21 14 8.3 7.8 1080 22885.6 e Estimated 172 RIO PUERTO NOBVO BASIN 50049000 RIO PIEDRAS AT RIO PIEDRAS, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) FEBRUARY MEAN DISCHARGE DAY (CFS) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 159 76 40 32 34 24 24 21 19 20 23 20 29 25 19 18 21 24 32 18 18 16 15 16 22 15 14 36 98 29 37 MEAN CONCEN- SEDIMENT MEAN TRATION DISCHARGE DISCHARGE (MG/L) (TONS/DAY) (CPS) JANUARY 1540 576 226 158 158 105 90 75 55 44 52 21 123 132 95 87 89 134 181 27 19 19 19 18 113 78 64 242 881 150 212 1390 178 26 14 16 6. 5. 4. 2. 2. 4. 1. 16 8. 4. 4. 5. 14 21 1. 7. 3. 2. 41 783 12 35 8 8 3 8 7 2 1 9 9 2 0 4 92 82 76 78 7 2 4 102 48 122 56 34 27 22 22 22 20 20 27 25 19 30 20 21 22 18 18 19 19 18 19 20 19 34 21 18 -._ ___ 102 48 122 56 34 27 22 22 22 20 20 27 25 19 30 20 21 22 18 18 19 19 18 19 20 19 34 21 18 1100 278 1030 338 201 125 78 52 49 48 45 130 138 100 142 100 75 45 30 29 25 21 19 16 12 8 203 108 105 387 38 572 58 19 9, 4, 3, 2, 2. 2, 21 9, 5. 13 5. 4, 2. 1, 1. 1. 1. 22 6. 5, .1 .6 .1 .9 .6 .4 ,8 .4 ,4 .3 .7 .5 ,4 .3 ,1 ,92 .82 .64 ,42 .1 ,1 MEAN DISCHARGE (CFS) 18 20 18 17 17 17 18 16 17 15 14 18 15 15 14 23 25 13 14 14 11 12 11 63 36 53 49 48 73 67 23 MEAN CONCEN- TRATION (MG/L) MARCH 104 103 101 100 98 95 93 90 82 73 61 50 43 38 30 97 152 62 58 57 56 55 52 550 272 335 295 284 518 548 110 SEDIMENT DISCHARGE (TONS/ DAY) 5.1 5.6 4.9 4.6 4.5 4.4 4.5 3.9 3.8 3.0 2.3 2.4 1.7 1.5 1.1 28 17 2.2 2.2 2.2 1.7 1.8 1.5 454 55 61 66 39 349 273 6.8 TOTAL 994 2614.68 882 1201.60 784 1413.7 RIO PUERTO NOEVO BASIN 173 MEAN DISCHARGE DAY (CFS) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 17 16 14 15 14 11 15 14 13 11 14 18 13 256 408 79 100 172 106 46 46 37 34 111 46 40 34 30 27 27 ___ MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) APRIL 78 70 68 65 61 50 65 62 51 32 21 66 61 1810 3660 428 863 1560 716 262 280 205 190 1020 288 227 178 157 140 140 ___ 3. 3. 2. 2. 2. 1. 4. 2. 1. 5. 2. 19900 19400 135 773 2130 284 34 50 20 17 889 43 26 16 13 10 10 - 6 0 6 6 3 5 8 3 8 96 80 6 3 -- 50049000 RIO PIEDRAS AT RIO PIEDRAS, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) MAY 24 24 22 20 21 21 21 21 485 276 121 43 26 36 22 18 18 16 16 18 15 15 13 12 12 14 13 14 14 15 14 140 128 112 104 104 104 101 98 4670 2430 741 164 138 239 148 118 100 90 74 62 50 33 21 20 20 19 18 35 58 50 45 9 8 6 5 5 5 5 5 39900 7060 574 19 9 34 8 5 4 3 3 3 2 1 1 2 2 1 .1 .3 .7 .6 .9 .9 .7 .6 .7 .8 .7 .7 .9 .2 .0 .0 .3 .74 .64 .64 .72 .64 .5 .2 .0 .7 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) JUNE 13 13 12 12 12 13 13 17 15 14 19 26 23 27 35 30 20 17 26 35 73 27 16 39 16 14 12 37 13 12 35 28 22 20 20 21 23 63 68 65 85 135 138 150 193 171 99 80 137 245 529 105 78 271 82 68 55 261 61 48 1. . 4. 2. 2. 4. 9. 8. 13 25 22 5. 3. 13 29 262 7. 3. 106 3. 2. 1. 109 2. 1. 2 98 72 64 64 74 80 0 8 5 4 5 6 3 7 7 4 5 6 8 1 6 1784 43784.16 1420 47692.88 651 648.22 174 RIO PUERTO NUEVO BASIN 50049000 RIO PIEDRAS AT RIO PIEDRAS, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN DISCHARGE DAY (CFS) MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) JULY MEAN DISCHARGE (CFS) MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) AUGUST MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) SEPTEMBER 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 24 14 11 12 17 13 108 12 11 11 11 12 14 36 14 13 61 44 20 15 13 31 19 16 19 17 14 16 27 28 17 133 65 48 40 85 61 1090 99 97 95 92 86 94 208 75 70 549 236 98 72 60 173 90 82 129 92 86 80 147 169 68 15 2 1 1 6 2 1290 3 2 2 2 2 3 33 2 2 449 38 5 2 2 24 4 5 6 4 3 3 18 15 3 .5 .4 .3 .5 .6 .2 .9 .8 .7 .8 .8 .8 .5 .3 .9 .1 .6 .2 .6 .2 .3 .5 .1 14 13 35 19 13 13 23 14 17 167 30 16 11 22 14 24 35 20 13 13 10 38 58 885 109 48 90 45 44 27 65 40 39 198 130 60 60 159 200 127 2330 120 55 50 107 57 95 205 88 63 53 45 265 463 3300 781 277 718 270 284 148 505 1. 1. 30 6. 2. 2. 22 7. 6. 11300 9. 2. 1. 9. 2. 8. 22 5. 2. 1. 1. 76 267 20900 298 38 299 38 54 12 361 5 4 7 1 1 6 3 7 4 5 2 2 8 4 2 9 2 218 45 33 26 27 22 24 83 126 60 417 88 47 83 79 61 40 32 34 23 20 222 38 29 25 20 17 16 15 15 2390 267 182 145 120 111 122 882 1060 363 3030 607 269 518 701 401 215 180 195 110 95 2160 221 163 120 97 85 75 70 70 7180 37 16 10 8 6 7 753 486 65 7510 180 35 331 473 105 23 16 22 6 5 12100 23 15 8 5 3 3 2 2 .7 .6 .9 .8 .1 .1 .2 .9 .2 .8 .8 TOTAL 690 1960.6 1945 33789.2 1985 29441.1 RIO PUERTO NOEVO BASIN 175 50049000 RIO PIEDRAS AT RIO PIEDRAS, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN DISCHARGE (CPS) MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) OCTOBER 40 39 42 47 37 34 32 48 36 72 36 36 36 37 37 32 33 33 76 36 37 48 46 41 80 123 43 54 59 61 85 133 123 149 186 107 90 78 192 95 542 182 130 120 63 92 80 62 48 370 98 88 206 175 158 660 1110 110 270 325 295 871 11 8 13 20 6 4 3 37 4 478 9 6 5 3 5 3 2 2 285 5 5 27 17 12 541 1460 10 42 122 58 1160 .8 .4 .4 .4 .9 .8 .7 .8 .4 .0 .5 .8 .2 .3 .2 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) NOVEMBER 29 20 18 16 17 18 17 41 26 19 33 21 149 63 35 31 188 39 33 36 50 40 30 28 26 21 21 18 20 21 140 88 30 47 46 46 48 221 152 79 188 106 1620 378 165 152 1860 205 163 172 303 255 190 182 158 139 149 151 148 138 9. 4. 1. 1. 1. 2. 1. 32 11 3. 42 6. 3830 144 14 11 3210 22 13 15 51 35 18 16 14 11 11 9. 10 10 ,8 ,0 3 ,8 9 0 ,8 6 5 0 MEAN DISCHARGE (CFS) 33 33 36 34 32 33 36 33 39 34 34 31 30 30 36 36 57 33 30 31 33 70 54 84 41 40 34 51 39 79 23 MEAN CONCEN- TRATION (MG/L) DECEMBER 136 139 133 110 85 80 80 79 117 108 98 78 68 64 80 95 286 105 88 75 68 427 246 475 135 131 75 201 112 477 110 SEDIMENT DISCHARGE (TONS/ DAY) 9.2 9.4 11 7.7 5.7 5.2 6.0 4.9 11 6.1 5.0 3.4 2.6 2.2 4.5 4.9 69 4.3 3.1 2.8 2.8 210 38 220 8.7 8.7 3.0 39 6.8 195 6.8 TOTAL 1496 4370.6 1124 7561.7 916.8 176 RIO PUERTO NUEVO BASIN 50049000 RIO PIEDRAS AT RIO PIEDRAS, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN DISCHARGE (CFS) MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) JANUARY 33 35 30 30 30 29 30 60 41 47 101 51 40 26 20 18 15 12 13 49 31 22 21 21 28 23 19 19 23 23 24 68 83 59 55 51 62 49 301 148 178 895 431 202 68 40 34 40 29 30 285 172 145 112 85 93 72 65 62 60 59 58 2. 4. 1. 1. 1, 2. 1. 76 14 19 483 66 22 2, 1, 1, 73 9 5. 3, 3, 6, 2, 2 2, 2 2, 2 ,6 ,8 ,9 ,6 ,7 ,8 .9 . 8 .3 .0 . 92 . 62 .68 .8 .5 .9 . 0 .1 .7 .1 .0 .4 .4 .3 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) FEBRUARY 24 20 17 19 18 24 15 35 35 7.1 6.8 4.9 5.0 9.5 --- 88 43 14 10 9.5 10 12 8.5 8.6 90 88 15 60 60 59 56 63 84 43 237 188 33 26 22 25 45 210 1050 758 280 95 62 48 31 43 44 40 2640 1030 86 2 2 1 1 2 4 1 33 43 1 34 1190 267 60 4 2 1 1 1 1 1 3250 742 3 .6 .1 .8 .8 .4 .6 .2 .76 .58 .36 .42 .3 .4 .2 .4 .0 .9 .2 .1 .9 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) MARCH 11 8 8 11 12 26 18 15 21 60 21 76 76 24 14 14 22 18 3 3 3 3 4 4 5 6 6 6 6 6 - .7 .6 .7 .0 .4 .8 .3 .9 .4 .0 .4 .2 .2 .1 -- 60 41 45 48 59 122 95 70 111 481 115 745 688 124 64 52 106 120 52 29 52 58 70 76 118 196 25 88 70 76 166 2. 1. 1. 1. 2. 11 4. 3. 9. 282 6. 924 279 9. 2. 2. 8. 8. 1. • 1. 2. 2. 3. 7. 19 4. 4. 2. 3. 14 1 1 2 7 2 4 1 1 8 4 4 0 5 2 5 86 7 0 8 9 3 7 3 8 3 TOTAL 964 819.82 5656.02 1626.36 RIO PUERTO NUEVO BASIN 177 50049000 RIO PIEDRAS AT RIO PIEDRAS, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN DISCHARGE (CPS) 5.7 5.7 5.7 12 19 31 14 12 12 15 12 13 20 25 13 12 12 11 11 12 12 11 11 10 9.9 11 ___ 260 283 759 ___ MEAN CONCEN- TRATION (MG/L) APRIL 238 106 100 76 71 163 58 40 30 40 39 35 72 101 30 28 27 25 24 23 21 20 20 20 20 20 20 3750 640 118 ___ SEDIMENT DISCHARGE (TONS/DAY) 28 6.0 5.4 3.3 3.3 43 1.7 .90 .66 1.2 .86 .88 4.6 12 .72 . 64 .62 .56 .56 .56 .50 .46 .46 .40 .38 .44 .38 12500 173 7.3 ___ MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CPS) (MG/L) (TONS/DAY) MAY MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CPS) (MG/L) (TONS/DAY) JUNE 940 410 19 25 25 19 36 ___ 20 18 17 15 ___ 12 11 10 11 11 10 10 10 10 10 11 11 52 29 29 30 39 202 141 153 80 95 68 60 174 52 35 29 20 19 18 16 13 10 9 9 9 10 10 10 10 10 10 293 110 126 128 198 2790 31 34 3. 8. 3. 2. 19 2. 1. 161 9. 13 16 36 4980 ,0 ,6 ,3 ,3 .4 ,3 .94 ,64 ,52 ,48 ,34 ,26 .18 .18 .18 .16 .18 ,18 .18 ,18 .20 .20 2 -- 219 907 212 34 14 12 12 12 13 97 15 15 15 14 15 117 9. 5. 5. 7. 9. 6. 5. 7. 7. 8. 8. -- 7. - 8 6 4 1 7 1 9 0 9 9 3 - 5 659 1510 6330 1400 143 40 40 43 46 50 1070 53 53 58 52 48 889 41 18 18 17 28 20 14 13 13 12 11 10 10 392 3230 39000 2880 14 1. 1. 1. 1. 1. 2000 1. 1. 2. 1. 1. 2070 1. • 1. . 3 1 2 2 5 7 9 0 7 6 9 22 22 28 2 35 18 22 24 24 22 18 18 TOTAL 12798.78 5325.10 49606.83 178 RIO PUERTO NUEVO BASIN 50049000 RIO PIEDRAS AT RIO PIEDRAS, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) AUGUST MEAN DISCHARGE DAY (CFS) 1 --- 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 ___ 8.8 7.2 6.7 40 126 40 28 24 570 44 172 42 25 24 29 114 27 20 19 32 35 23 --- ___ ___ 39 33 35 ___ MEAN CONCEN- SEDIMENT MEAN TRATION DISCHARGE DISCHARGE (MG/L) (TONS/DAY) (CFS) JULY 21 .64 649 29 20 20 207 949 204 126 100 5300 225 1150 191 104 100 129 1740 117 80 79 156 202 93 31 80 1480 208 167 174 409 845 37 655 22 8. 5. 35400 36 2020 22 5. 5. 9. 2900 8. 3. 3. 24 42 4. 1. 3. 2150 22 14 18 120 73 32 30 9 6 9 4 9 0 5 4 8 5 7 ___ 51 37 96 41 63 39 ___ 84 73 52 97 59 118 85 162 97 ___ 156 102 50 68 ___ --- 86 ___ ._- 39 20 __- ___ 51 37 96 41 63 39 ___ 84 73 52 97 59 118 85 162 97 ___ 156 102 50 68 ___ --- _-_ 86 ___ ._- 39 20 33 22 191 200 671 237 400 155 25 488 467 290 808 345 859 511 1550 803 752 1430 863 196 428 682 1090 137 605 103 2580 217 95 3. 2. 47 19 754 27 131 15 2. 229 130 38 750 54 577 130 2330 676 301 1600 1010 27 113 432 2460 12 690 7. 5210 33 4. .2 .0 ,2 .8 .9 MEAN DISCHARGE (CFS) MEAN CONCEN- TRATION (MG/L) SEDIMENT DISCHARGE (TONS/ DAY) SEPTEMBER 17 26 21 16 15 14 132 72 92 239 41 13 14 ___ 37 21 20 1590 63 109 69 23 173 144 22 18 277 77 44 137 80 133 105 51 25 22 908 615 728 1660 300 59 57 113 271 105 88 13000 227 723 357 55 1050 977 105 80 2470 251 106 951 3. 11 6. 2. 1. 2320 441 1130 4780 89 2. 2. 18 143 16 4. 165000 35 620 344 3. 1320 1470 5. 3. 12200 48 6. 1670 5 1 1 0 84 2 6 6 2 7 7 1 TOTAL 44389.59 17815.1 191696.64 RIO PUERTO NUEVO BASIN 179 50049000 RIO PIEDRAS AT RIO PIEDRAS, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN DISCHARGE (CFS) 48 502 59 74 165 36 28 66 28 24 23 22 24 36 168 30 22 19 36 26 26 270 41 35 32 31 30 28 23 61 50 MEAN CONCEN- TRATION (MG/L) OCTOBER 152 2880 205 307 1430 103 66 274 59 52 49 47 45 104 889 75 35 22 105 61 58 1510 121 57 35 27 23 21 21 2780 920 SEDIMENT DISCHARGE (TONS/DAY) 21 15100 39 207 1990 11 5.1 120 4.6 3.4 3 .0 2.8 2.9 16 1770 7.1 2.2 1.2 27 4.4 4.0 8030 19 5.6 3 .0 2.2 1.8 1.7 1.3 1060 485 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) NOVEMBER 87 24 20 21 27 21 23 31 131 67 25 22 21 29 29 25 42 19 26 34 18 17 17 16 17 17 18 21 21 21 401 47 44 41 58 44 56 76 985 264 59 47 43 172 70 63 139 39 65 104 29 19 18 18 17 13 9 9 20 28 521 3 2 2 4 2 4 9 1410 175 4 2 2 15 5 4 44 2 6 31 1 1 1 .2 .4 .3 .8 .5 .3 .0 .1 .8 .4 .8 .2 .0 .3 .4 .87 .82 .81 .75 .57 .45 .52 .2 .6 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) DECEMBER 22 21 20 18 14 14 14 15 16 17 17 16 15 15 14 21 16 16 15 14 14 16 15 16 17 18 16 20 152 19 173 23 21 19 18 15 12 10 10 10 10 10 10 14 16 13 44 28 22 17 15 14 13 14 14 13 12 11 15 3600 37 950 1.4 1.2 1.0 .83 .56 .44 .38 .39 .42 .46 .46 .45 .57 .62 .47 4.4 1.2 .95 .69 .55 .51 .54 .54 .57 .55 .54 .48 1.0 2380 1.9 3250 2063 28951.3 2261.09 806 5654.07 180 RIO PUERTO NUEVO BASIN 50049000 RIO PIEDRAS AT RIO PIEDRAS, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CPS) (MG/L) (TONS/DAY) JANUARY 30 22 23 20 17 14 14 14 15 13 16 12 12 14 17 19 22 40 20 91 14 13 23 19 11 9.4 8.8 13 17 14 13 138 188 139 93 66 59 52 45 34 28 31 22 20 26 34 68 47 875 181 714 25 19 58 45 25 21 16 24 56 23 16 15 11 8. 5. 3. 2. 1. 1. 1, 1. 1. 1. 1. 6. 3. 386 10 666 11 2. 1. 3. .5 .1 .1 .1 .9 .6 ,4 , 0 ,5 ,75 66 ,1 ,7 ,1 ,2 94 65 6 73 52 38 5 2 85 56 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) FEBRUARY 10 10 11 9.7 9.0 8.6 13 16 20 16 12 11 11 58 10 12 10 15 15 9.8 11 16 12 10 11 13 16 19 _-. _-_ --- 13 16 18 15 12 10 19 32 42 33 16 16 16 248 20 20 15 23 31 19 16 252 22 21 18 38 30 38 ___ ___ ___ .36 .44 .59 .37 .30 .23 .97 1.5 2.2 2.1 .51 .46 .44 149 .55 .76 .42 1.1 1.6 .51 .46 12 .71 .56 .53 1.5 1.3 2.1 -__ ___ _._ MEAN DISCHARGE (CFS) MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) MARCH 20 17 19 23 23 21 17 17 33 17 205 87 181 32 20 41 18 14 15 13 9.6 12 12 14 15 19 22 14 15 14 12 64 27 20 14 9 7 7 13 89 32 1120 500 896 177 107 152 43 32 104 25 20 23 19 19 27 41 48 18 198 30 23 4. 1. 1. . 1. 13 1. 1570 462 883 19 5. 32 2. 1. 5. 1. 2. 3. 11 1. . 0 2 0 91 53 41 33 8 6 6 2 2 5 87 50 79 63 69 2 3 4 69 3 74 600.2 1150.64 395.1 183.57 991.6 3029.39 RIO PUERTO NUEVO BASIN 181 DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL 50049000 RIO PIEDRAS AT RIO PIEDRAS, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) 10 9. 8. 8. 8. 8. 8. 7. 7. 7. 7. 8. 27 19 13 13 25 98 37 49 13 14 12 13 218 34 15 13 13 12 5 7 3 2 3 8 9 8 9 9 4 APRIL 18 14 12 12 11 10 10 9 8 7 6 6 79 49 20 17 74 621 156 212 23 27 16 13 888 93 32 28 22 18 .48 .35 .27 .27 .26 .22 .23 . 19 .17 .16 .14 .13 19 8.5 .70 .58 23 542 82 120 .79 1.2 .55 .45 3020 21 1.3 .97 .77 .57 MAY 739.7 3846.25 8.4 14 13 11 9.6 9.1 7.8 e20 e250 e50 34 24 42 33 19 14 18 13 13 11 11 12 12 12 12 12 11 11 10 11 11 738.9 14 14 14 12 11 10 9 e40 e!330 e26 109 57 140 96 41 25 39 29 17 13 15 8 9 10 11 12 13 15 16 13 7 .32 .53 .47 .36 .29 .25 .19 e2.2 e894 e3.5 26 5.7 32 12 2.5 .94 2.1 1.1 .60 .38 .43 .27 .29 .31 .34 .39 .37 .42 .43 .41 .21 989.30 MEAN DISCHARGE (CFS) 38 14 15 27 163 21 17 16 15 24 12 12 13 43 43 16 15 14 14 12 12 12 12 19 14 11 13 12 12 17 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) JUNE 138 35 25 77 1310 86 68 52 38 68 21 18 17 152 142 24 15 9 7 6 6 6 9 28 23 12 8 4 6 24 80 2.1 3.3 14 2410 5.1 3.1 2.2 1.4 8.4 .67 .56 .57 58 23 1.1 .56 .33 .25 .20 .18 .20 .28 2.6 .89 .37 .27 .12 .19 1.9 678 2621.84 e Estimated 182 RIO PUERTO NUEVO BASIN 50049000 RIO PIEDRAS AT RIO PIEDRAS, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) AUGUST MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL YEAR 14 11 11 14 23 13 18 11 33 12 8.1 7.8 8.6 9.4 8.6 7.8 25 46 9.5 8.7 11 10 11 82 15 15 28 13 12 11 10 517.5 9945.8 JULY 29 26 22 32 72 24 76 135 174 43 11 10 10 10 10 7 79 173 16 15 14 13 19 390 28 31 89 22 21 21 19 — - 1. . 1. 9. 7. 4. 51 1. 15 61 153 1. 1. 23 339. 59571. 2 80 64 5 1 88 2 5 6 23 21 24 25 23 15 40 37 43 36 62 4 9 76 67 60 51 75 37 MEAN DISCHARGE (CFS) 10 21 9 8 14 8 14 7 8 29 9 8 28 9 6 6 7 10 7 7 7 67 8 6 20 7 8 8 8 6 7 388 .5 .4 .4 .3 .1 .7 .9 .0 .8 .8 .8 .4 .5 .5 .5 .8 .9 .3 .1 .5 .8 .9 .9 10 21 9 8 14 8 14 7 8 29 9 8 28 9 6 6 7 10 7 7 7 67 8 6 20 7 8 8 8 6 7 .5 .4 .4 .3 .1 .7 .9 .0 .8 .8 .8 .4 .5 .5 .5 .8 .9 .3 .1 .5 .8 .9 15 79 93 35 53 57 39 11 13 96 16 15 270 112 76 62 53 28 9 36 9 592 194 10 56 11 39 53 51 46 38 11 2 3 1 2 35 47 3 1 1 1 433 4 9 1 1 .43 .5 .81 .9 .3 .4 .21 .31 .49 .39 .4 .3 .2 .1 .89 .17 .82 .19 .5 .17 .0 .22 .87 .2 .2 .84 .84 MEAN DISCHARGE (CFS) MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/ DAY) SEPTEMBER 7.8 8.1 34 99 24 6.6 315 18 12 10 11 8.8 63 11 20 13 11 34 12 12 9.6 11 139 67 18 11 49 13 11 61 39 20 128 263 76 12 1540 40 30 62 44 13 379 24 58 29 21 123 18 26 15 17 1080 338 49 69 265 85 18 257 52 293 14 6590 3. 1. 1. 1. 236 11 1. 40 1. 2030 418 12 2. 127 3. 132 83 46 20 1 5 7 6 29 74 9 97 65 4 38 56 5 2 54 566.65 9977.52 RIO PUERTO NUEVO BASIN 50049000 RIO PIEDRAS AT RIO PIBDRAS, PR--Continued WATER QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1990 PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT 183 DATE NOV 1987 24... 27.. . 27. .. 27. .. APR 1988 15.. . 18. .. MAY 10. .. AUG 24. . . SEP 09. .. 11.. . OCT 31.. . NOV 13.. . FEB 1989 16.. . 26.. . APR 28.. . MAY 31. . . DATE NOV 1987 24... 27. .. 27.. . 27. .. APR 1988 15.. . 18. .. MAY 10.. . AUG 24.. . SEP 09.. . 11. .. OCT 31.. . NOV 13.. . FEB 1989 16... 26... APR 28. . . MAY 31. . . TIME 0830 1340 1450 1500 0920 2130 1800 1445 1350 1045 1520 1700 2215 1820 1540 1610 SED. SUSP. FALL DIAM. PERCENT FINER THAN .016 MM 86 70 45 39 85 69 59 33 75 60 74 36 39 55 55 31 DIS- CHARGE, INST. CUBIC FEET PER SECOND 49 229 488 528 165 1007 3377 1835 225 974 538 1650 792 862 2037 1623 SED. SUSP. PALL DIAM. PERCENT FINER THAN .031 MM 87 80 50 44 90 76 69 41 88 73 88 46 51 76 66 39 SEDI- MENT, SUS- PENDED (MG/L) 844 1586 4558 4388 1445 11730 19977 34111 5320 6647 23963 22426 3270 35112 22600 12381 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .062 MM 95 83 56 52 95 90 77 48 93 83 95 63 63 85 73 44 SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) 112 980 6000 6250 644 31900 182000 169000 3230 17500 34800 99900 7000 81700 124000 54200 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .125 MM 96 90 65 68 97 97 87 62 97 94 98 82 77 96 83 57 SED. SUSP. FALL DIAM. PERCENT FINER THAN .002 MM 53 38 20 21 50 28 22 13 32 20 31 12 11 12 20 11 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .250 MM 97 96 79 79 99 99 96 79 99 98 100 97 88 99 94 70 SED. SUSP. FALL DIAM. PERCENT FINER THAN .004 MM 69 46 26 24 63 41 36 20 46 34 44 18 15 24 32 17 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .500 MM 98 98 91 92 100 100 100 91 100 100 100 100 95 100 99 91 SED. SUSP. FALL DIAM. PERCENT FINER THAN .008 MM 82 59 35 38 75 55 47 26 59 47 58 21 26 31 43 24 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN 1.00 MM 100 100 97 100 100 100 100 97 100 100 100 100 98 100 100 97 184 RIO PUERTO NDEVO BASIN 50049000 RIO PIEDRAS AT RIO PIEDRAS, PR—Continued WATER QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1990 PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT JUN 1989 02... 11. . . JUL 18. .. 27. . . AUG 24. . . SEP 07. . . 23. . . OCT 30. . . 31. . . NOV 09. .. APR 1990 25. .. AUG 22. .. SEP 04. . . 07. . . 07. . . 23. .. DATE JUN 1989 02. . . 11. . . JUL 18. . . 27. . . AUG 24. .. SEP 07. . . 23. . . OCT 30. . . 31. . . NOV 09. . . APR 1990 25. . . AUG 22. . . SEP 04. .. 07. . . 07. .. 23. . . TIME 1410 0255 1555 1620 1425 1915 1835 1350 1500 1415 1340 1345 2035 1425 1515 1530 SED. SUSP. FALL DIAM. PERCENT FINER THAN 016 MM 26 8 55 47 60 37 83 60 63 37 41 52 77 70 53 67 DIS- CHARGE, INST. CUBIC FEET PER SECOND 1560 1230 1041 1127 542 1360 340 429 326 974 2640 820 952 1630 2800 1530 SED. SUSP. FALL DIAM. PERCENT FINER THAN .031 MM 32 10 66 60 71 49 95 74 79 48 51 55 86 78 70 83 SEDI- MENT, SUS- PENDED (MG/L) 13300 19000 13200 9340 2849 7177 1219 9120 10320 2880 6250 4970 1590 6700 8000 24100 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .062 MM 39 12 75 69 80 61 96 81 92 60 56 98 93 93 98 94 SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) 56000 63100 37100 28400 4170 26300 1120 10600 9080 7180 44500 11000 4090 29500 60500 99500 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .125 MM 46 18 85 80 90 77 98 95 98 77 63 99 96 96 99 99 SED. SUSP. FALL DIAM. PERCENT FINER THAN .002 MM 7 3 22 16 23 12 38 17 22 9 14 11 16 32 17 8 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .250 MM 63 36 92 90 95 91 100 98 100 89 75 100 98 98 100 99 SED. SUSP. FALL DIAM. PERCENT FINER THAN .004 MM 14 4 32 26 33 20 50 29 34 14 21 19 34 36 28 45 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .500 MM 89 49 96 96 98 97 100 100 100 96 90 100 98 99 100 100 SED. SUSP. FALL DIAM. PERCENT FINER THAN .008 MM 19 5 43 34 45 28 69 40 46 23 31 31 51 59 37 53 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN 1.00 MM 94 58 98 98 100 99 100 100 100 99 96 100 100 100 100 100 RIO PUERTO NUEVO BASIN 50049100 RIO PIEDRAS AT HATO REY, PR LOCATION.--Lat 18°24'34", long 66°04'10", Hydrologic Unit 21010005, at bridge on Avenida Pifieiro at Expreso Las Americas, and 0.8 mi (1.3 km) southwest of Hato Rey. 185 DRAINAGE AREA.--15.4 mi 1 (39.9 kma ). WATER-DISCHARGE RECORDS PERIOD OP RECORD.--June 1970 to December 1987 (discharge measurements only), 1972 to December 1982 (maximum discharge only)/ January 1988 to current year. GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 16 ft (5 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. Mean daily discharge affected by sewage discharges (approximately 2.0 ftVs (0.06 m3 /s)), 20 ft (6 m) upstream from gaging station. EXTREMES FOR PERIOD OP RECORD.--Maximum discharge 8,640 ftVs (245 m3/s), June 17, 1970, gage height 20.77 ft (6.33 m), from floodmarks, from rating curve extended above 3,000 ftVs (85.0 mVs), on basis of slope-area and contracted opening measurements of peak flow; minimum daily discharge 8.4 ftVs (0.24 m3/s), May 23, 1989. EXTREMES FOR WATER YEARS 1988-90.--Peak discharge greater than base discharge of 2,500 ftVs (70.8 mVs) and maximums (*): Discharge Date Aug. Sept. Oct. Oct. 24, 18, 2, 22, 1988 1989 1989 1989 Time 1615 1030 1415 1400 (ftVs) *7, *7, 3, *3, 270 970 040 610 (mVs) 206 226 86.1 102 Gage height (ft) *19. *19, 14, *14. ,24 .92 .07 ,92 (m) 5 6 4 4 .864 .072 .288 .548 Date Time Discharge (ftVs) (mVs) 2,740 3,050 3,420 3,420 77.6 86.4 96.8 96.8 Gage height (ft) (m) 13.57 14.08 14.64 14.64 4.136 4.292 4.462 4.462 Dec. 31,1989 1800 Apr. 25,1990 1345 May 9,1990 1430 Sept. 7,1990 1545 Minimum daily discharge, 11 ft3 /s (0.312 mVs), Jan. 11, 1988; 8.4 ft.3/a (0.238 mVs) May 23,1989; 9.5 ftVs (0.269 July 11,1990. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN VALUES DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC-FT CFSM IN. NOV JAN MAY JUN SEP 187 80 209 91 47 31 32 27 26 25 25 35 27 23 33 24 25 26 24 23 23 22 22 24 21 12 22 11 44 45 23 137 21 32 --- 51 --- 1242 --- 42.8 --- 209 --- 21 --- 2460 2.82 3.04 22 24 21 21 21 21 22 20 20 22 22 25 22 24 23 34 36 19 19 20 19 20 19 104 41 63 60 48 99 88 22 1041 33.6 104 19 2060 2.21 2.55 21 19 19 21 21 21 24 20 20 20 21 26 18 202 876 132 180 255 131 38 39 29 28 249 59 48 26 23 24 26 2636 87.9 876 18 5230 5.78 6.45 24 24 23 23 23 23 23 26 703 426 157 26 22 38 21 17 18 19 18 39 19 22 22 19 23 24 20 21 21 23 18 1925 62.1 703 17 3820 4.09 4.71 18 17 16 16 16 16 15 17 14 16 19 21 20 30 31 26 22 15 28 59 127 37 24 59 22 20 20 131 30 23 925 30.8 131 14 1830 2.03 2.26 36 22 21 22 28 28 301 27 25 25 27 26 27 53 22 22 81 50 23 20 19 45 24 22 23 20 18 22 32 30 19 1160 37.4 301 18 2300 2.46 2.84 17 17 48 17 13 14 28 14 15 256 35 18 15 27 17 32 45 20 16 16 15 62 78 1030 160 73 159 99 88 54 113 2611 84.2 1030 13 5180 5.54 6.39 262 62 44 42 41 35 34 125 246 95 541 140 63 120 102 77 41 34 45 31 28 236 52 39 34 30 31 31 30 30 --- 2721 90.7 541 28 5400 5.97 6.66 186 RIO PUERTO NOEVO BASIN 50049100 RIO PIEDRAS AT HATO KEY, PR—Continued DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JDL AUG SEP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC -FT CFSM IN. 37 35 40 58 29 31 26 96 24 69 20 24 22 21 22 20 22 20 67 21 22 31 20 20 84 131 24 41 65 48 90 1280 41.3 131 20 2540 2.72 3. 13 29 21 20 18 24 38 e!8 e50 e32 e22 e36 e24 e!90 elOO e50 e35 e240 e50 e38 e41 e66 e56 20 19 22 27 21 18 17 17 --- 1359 45.3 240 17 2700 2.98 3.33 18 17 21 17 16 16 21 16 24 19 18 17 17 16 19 17 51 16 14 18 18 65 39 88 23 20 16 53 22 78 23 833 26.9 88 14 1650 1.77 2.04 16 18 15 15 15 16 14 63 25 35 160 91 44 23 20 25 21 19 20 62 23 19 18 19 21 17 17 17 19 17 22 926 29.9 160 14 1840 1.97 2.27 18 17 16 18 17 24 15 33 41 19 20 15 15 15 52 243 141 55 26 22 21 21 23 17 18 126 164 31 ___ ___ --- 1243 44.4 243 15 2470 2.92 3.04 26 23 23 23 22 36 23 21 30 85 22 120 127 29 20 22 26 37 20 28 21 17 17 19 21 16 49 20 16 17 29 1005 32.4 127 16 1990 2.13 2.46 40 20 23 25 28 49 14 13 13 16 15 17 25 29 15 12 12 12 12 12 11 11 11 11 12 12 11 334 289 27 --- 1131 37.7 334 11 2240 2.48 2.77 37 36 19 24 26 17 46 15 14 11 13 11 12 12 11 12 11 11 10 9.4 9.1 9.0 8.4 8.5 8.9 71 20 28 23 74 337 954.3 30.8 337 8.4 1890 2.03 2.34 161 331 851 253 52 31 27 26 24 25 101 25 21 19 17 16 93 61 19 17 20 21 19 16 17 16 16 16 16 15 --- 2342 78.1 851 15 4650 5.14 5.73 19 97 14 12 12 20 92 15 10 9.5 465 74 175 43 22 21 29 116 39 20 19 48 38 18 17 16 122 28 21 20 53 1704.5 55.0 465 9.5 3380 3.62 4.17 22 20 41 20 67 23 39 18 17 48 39 19 60 18 58 23 155 83 86 183 87 36 61 121 207 29 94 23 412 67 34 2210 71.3 412 17 4380 4.69 5.41 29 41 34 29 29 28 144 117 170 291 113 37 37 87 59 60 44 1830 84 188 97 32 219 178 39 32 241 90 21 88 4488 150 1830 21 8900 9.84 10.98 WTR YR 1989 TOTAL 19475.8 MEAN 53.4 MAX 1830 MIN 8.4 AC-FT 38630 CFSM 3.51 IN. 47.66 e Estimated RIO PUERTO NUEVO BASIN 187 OCT 50049100 RIO PIEDRAS AT HATO REY, PR—Continued DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES NOV JAN FEB JUN JUL SEP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC- FT CFSM IN. CAL YR WTR YR 27 429 51 73 185 27 19 91 20 14 12 13 16 78 225 56 37 32 61 46 63 380 93 75 65 64 61 56 48 103 87 2607 84.1 429 12 5170 5.53 6.38 1989 1990 164 45 33 46 66 55 48 124 222 138 47 37 34 50 48 39 116 33 45 78 28 25 25 22 24 25 28 33 33 33 --- 1744 58.1 222 22 3460 3.82 4.27 TOTAL 21462 TOTAL 15122 33 29 31 29 20 20 20 20 18 18 19 18 19 17 17 35 15 15 18 16 15 14 14 14 13 12 13 22 284 19 261 1108 35.7 284 12 2200 2.35 2.71 .8 MEAN .3 MEAN 46 27 28 25 22 17 17 17 19 16 26 17 16 18 25 27 34 87 40 197 30 25 74 69 19 17 16 25 37 29 26 1088 35.1 197 16 2160 2.31 2.66 58.8 MAX 41.4 MAX 23 19 24 17 16 13 24 30 39 33 17 14 14 129 15 19 18 25 23 13 21 36 21 16 17 23 24 32 ___ ___ ___ 715 25.5 129 13 1420 1.68 1.75 1830 429 38 17 15 16 15 14 14 14 58 18 360 199 353 77 35 91 32 25 29 23 15 25 16 16 14 17 28 19 30 28 18 1669 53.8 360 14 3310 3.54 4.08 MIN 8.4 MIN 9.5 14 13 13 15 14 15 16 15 16 15 14 15 93 41 16 14 31 181 62 80 20 20 18 18 273 44 20 18 19 19 --- 1162 38.7 273 13 2300 2.55 2.84 AC-FT 42570 AC-FT 30000 22 18 17 16 15 15 14 136 328 41 36 37 54 33 19 16 25 22 16 16 16 16 16 16 16 16 14 14 14 13 13 1060 34.2 328 13 2100 2.25 2.59 CFSM 3, CFSM 2 45 16 15 22 302 23 16 16 16 38 13 13 13 61 46 14 19 12 13 13 12 11 12 24 12 11 12 11 11 16 --- 858 28.6 302 11 1700 1.88 2.10 .87 IN. .73 IN. 12 10 10 16 17 16 15 11 36 11 9.5 9.8 11 12 11 10 34 64 15 14 14 14 15 168 20 18 109 18 16 15 16 767.3 24.8 168 9.5 1520 1.63 1.88 52.53 37.01 17 29 15 15 24 15 21 15 18 58 16 15 63 16 13 13 15 20 13 14 15 106 19 15 54 13 11 11 11 11 11 702 22.6 106 11 1390 1.49 1.72 10 10 43 121 95 20 426 30 22 16 19 13 143 19 25 21 17 45 16 16 14 18 143 81 18 14 49 12 11 155 1642 54.7 426 10 3260 3.60 4.02 188 RIO PUERTO NUEVO BASIN 50049100 RIO PIEDRAS AT HATO REY, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°24'34", long 66°04'10", at bridge on Avenida Pifieiro at Expreso Las Americas, and 0.8 mi (1.3 km) southwest of Hato Rey. DRAINAGE AREA.--15.4 mi 1 (39.9 km 1 ). PERIOD OP RECORD.--Water years 1971 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE TIME DIS- CHARGE INST. CUBIC FEET PER SPE- CIFIC CON- DUCT- ANCE SECOND (US/CM) OCT 13 DEC 12 FEB 15 APR 16 JUN 21 AUG 20 OCT 13 DEC 12 FEB 15 APR 16 JUN 21 AUG 20 1989 1245 1200 1990 1205 1050 . .. 1150 1135 HARD- NESS TOTAL (MG/L DATE AS CAC03 ) 1989 130 1990 160 160 15 17 19 13 12 14 HARD- NESS 427 490 459 517 528 531 NONCARB CALCIUM WH WAT DIS- TOT FLD SOLVED MG/L AS (MG/L CACO3 0 -- -- 0 -- 0 AS CA) 34 -- -- 43 -- 46 PH (STAND- ARD UNITS) 7.60 7.70 7.50 7.80 7.70 7.80 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 10 -- -- 12 -- 12 SOLIDS, TEMPER- ATURE WATER (DEG C) 29.0 26.0 24.0 28.0 31.5 30.0 TUR- BID- ITY (NTU) 6.3 1.2 1.4 12 3.1 3.6 OXYGEN, DIS- SOLVED (MG/L) 4.8 6.6 3.9 4.8 6.5 4.7 SODIUM POTAS- SODIUM, DIS- SOLVED (MG/L AS NA) 27 -- -- 33 -- 35 AD- SORP- SIUM, DIS- TION SOLVED RATIO (MG/L 1 -- -- 1 -- 1 AS K) 4.1 -- -- 4.0 -- 4.3 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 61 80 46 61 87 61 ALKA- LINITY WAT WH TOT PET FIELD MG/L AS CACO3 150 180 170 180 170 180 OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 61 26 31 35 44 38 SULFIDB TOTAL (MG/L AS S) <0.5 -- -- <0.5 -- " COLI- FORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) K1100000 K80000 K176000 K180000 560000 K600000 SULFATB DIS- SOLVED (MG/L AS S04) 20 -- -- 14 -- 18 STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) 320000 33000 49000 K100000 230000 K900000 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 28 -- -- 35 -- 43 RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL RIDE, DIS- SOLVED DATE (MG/L AS F) OCT 1989 13.. . DEC 12.. . FBB 1990 15. .. APR 16.. . JUN 21.. . AUG 20. . . K = non- ideal 0.10 -- -- 0.10 -- 0.10 count DIS- CONSTI- DIS- AT SOLVED TUENTS, SOLVED DEG (MG/L 105 NITRO- NITRO- NITRO- NITRO- NITRO- GEN, GEN, GEN, GEN, GEN, . C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC DIS- (TONS SUS- AS SOLVED SI02) (MG/L) 25 -- -- 32 -- 31 238 -- -- 265 -- 297 PER FENDED DAY) (MG/L) 9.64 -- -- 17.8 -- 11.2 10 18 7 56 14 9 TOTAL TOTAL TOTAL TOTAL TOTAL (MG/L (MG/L (MG/L (MG/L (MG/L AS N) AS 0.51 0 0.55 0 0.73 0 0.55 0 0.45 0 0.28 0 N) AS .09 0 .25 0 .17 0 .15 0 .35 0 .22 0 N) AS N) AS .60 .80 .90 .70 .80 .50 2.0 2.5 2.0 2.8 2.0 0.64 N) 1.7 1.1 1.3 1.4 0.70 4.0 RIO PUERTO NUBVO BASIN 50049100 RIO PIEDRAS AT HATO REY, PR—Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 189 DATE OCT 1989 13.. . DEC 12.. . FEB 1990 15.. . APR 16.. . JUN 21.. . AUG 20. . . DATE OCT 1989 13.. . DEC 12.. . FBB 1990 15.. . APR 16. .. JUN 21.. . AUG 20.. . NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 3.7 3.6 3.3 4.2 2.7 4.6 IRON, TOTAL RECOV- ERABLE (UG/L AS FB) 850 -- -- 2400 -- -- NITRO- GEN, TOTAL (MG/L AS N) 4.3 4.4 4.2 4.9 3.5 5. 1 LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) 4 -- -- 1 -- -- NITRO- GEN, TOTAL (MG/L AS NO3) 19 19 19 22 15 23 MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) 110 -- -- 380 -- -- PHOS- PHORUS ARSENIC TOTAL TOTAL (MG/L (UG/L AS P) AS AS) 0.84 1 0.85 0.58 0.91 2 0.80 1.0 MERCURY TOTAL SELE- RECOV- NIUM, ERABLB TOTAL (UG/L (UG/L AS HG) AS SB) <0.10 <1 __ __ 0.10 <1 __ __ BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) 200 — — 200 -- " SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) 2 -- -- 1 -- -- CHRO- BORON, CADMIUM MIUM, TOTAL TOTAL TOTAL RECOV- RECOV- RECOV- ERABLE ERABLB ERABLE (UG/L (UG/L (UG/L AS B) AS CD) AS CR) 30 <1 <1 __ __ 30 <1 2 __ .. ZINC, TOTAL RECOV- CYANIDE BRABLB TOTAL PHENOLS (UG/L (MG/L TOTAL AS ZN) AS CN) (UG/L) 40 <0.010 5 __ __ 20 <0.010 2 __ __ COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) 20 -- __ <10 -- " METHY- LENE BLUB ACTIVE SUB- STANCE (MG/L) 0.16 -- -- 0.10 -- -- 190 RIO PUERTO NUEVO BASIN 50049310 QUEBRADA JOSEFINA AT PINERO AVENUE, PR LOCATION.--Lat 18°24'34", long 66°04'31" Hydrologic Unit 21010005, on right bank, 75 ft. (23 m) downstream from bridge at highway 17, Pinero Avenue, 1.6 mi (2.6 km), northwest from Rio Piedras Plaza, 0.8 mi (1.3 km) north from University of Puerto Rico Medical Center and 0.4 mi (0.6 km) upstream from confluence with Rio Piedras. DRAINAGE AREA.--19.0 m> (49.2 km'). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--February 1988 to current year. GAGE.--Water-stage recorder. Elevation of gage is 13.1 ft (4.0 m), from topographic map. REMARKS.--Record fair. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 4,320 ft'/s (122 m'/s), Sept. 18, 1989, gage-height 8.69 ft (2.649 m) from rating curve extended above 100 ft'/s (2.83 m'/s), on basis of step-backwater analysis; minimum discharge, 0.82 ft'/s (0.023 m'/s) , May 27, 1989. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,800 ft'/s (51.0 mVs) and maximum (*): Date Oct. Nov. 22 9 Time 1330 1315 Discharge (ftVs) (m'/s) 2,440 2,100 69.1 59.5 Gage (ft) 6.66 6.23 height (m) 2.030 1.899 Date May Sept. 9 30 Time 1345 1730 Discharge (ftVs) (mVs) *2,900 2,390 82.1 67.7 Gage height (ft) (m) *7.20 6.60 2.194 2.012 Minimum daily discharge, 1.1 ft'/s (0.031 mVs), Aug. 11. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES DAY OCT NOV DEC JAN MAR APR MAY JUN JUL 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC- FT CFSM IN. CAL YR WTR YR 14 16 14 15 16 10 11 26 8.3 8.7 8.5 9.2 10 40 42 6.1 7.7 6.9 6.7 7.4 18 82 7.9 6.2 7.2 8.2 7.7 7.3 16 12 13 469.0 15.1 82 6.1 930 3.94 4.54 1989 1990 30 14 12 17 28 16 12 42 78 22 7.7 6.3 7.4 12 6.8 8.1 22 5.5 11 21 6.3 6.3 9.8 12 13 12 12 11 7.7 12--- 480. 9 16.0 78 5.5 954 4.17 4.66 TOTAL 5521 TOTAL 3307 7.3 7.5 6.4 5.7 5.0 .6 .2 .0 .6 .9 .1 .0 3.6 3.2 3.4 12 2.8 3.3 3.7 3.1 2.9 2.9 3.5 3.0 4.2 2.5 2.3 5.8 34 4.6 64 228.1 7.36 64 2.3 452 1.92 2.21 8 MEAN 2 MEAN 8.7 3.5 5.0 4.1 4.2 4.0 3.3 3.1 6.1 3.4 8.7 2.6 2.8 2.9 9.9 6.6 9.8 22 20 47 4.0 4.9 21 23 4.7 4.7 3.7 3.9 8.8 5.7 2.7 264.8 8.54 47 2.6 525 2.22 2.57 15.1 MAX 9.06 MAX 5.4 4.0 11 4.2 2.7 2.7 8.8 20 15 12 4.0 3.6 4.3 24 5.3 8.1 7.9 12 4.4 4.3 10 11 7.7 3.7 4.7 6.1 3.8 11___ ___ --- 221.7 7.92 24 2.7 440 2.06 2.15 664 MIN 107 MIN 19 4.8 3.0 3.6 4.1 2.8 3.0 4.3 17 7.8 56 35 50 17 12 16 2.6 2.2 2. 6 3.9 2.4 10 2.3 6.8 3.4 5.3 3.8 3.9 5.0 8.6 4.5 322.7 10.4 56 2.2 640 2.71 3.13 1.8 1. 1 6.3 7.1 7.2 4.5 3.6 4.0 3.6 2.5 2.6 2.3 2.7 2.6 13 2.8 2.3 3.2 5.0 15 5.0 6.8 5.1 3.4 3.2 4.6 11 6.4 2.8 3.6 4.1 3.8 --- 150.1 5.00 15 2.3 298 1.30 1.45 AC-FT 10950 AC-FT 6560 6.6 4.9 2.2 2.2 2.2 2.2 2.4 39 105 7.1 2.8 13 9.7 6.4 3.1 3.0 7.6 4.9 3.1 3.0 2.6 2.5 2.4 2.2 2.2 2.2 2.2 2.4 2.1 3.2 2.0 256.4 8.27 105 2.0 509 2.15 2.48 CFSM 3 CFSM 2 4.7 2.2 4.1 4.4 77 3.0 1.9 2.5 2.7 9.8 2.1 2.1 2.3 11 12 2.3 7.1 2.6 2.6 3.0 3.0 3.0 3.1 8.0 3.2 2.6 2.6 2.6 2.9 7.2 --- 197.6 6.59 77 1.9 392 1.72 1.91 .94 IN. .36 IN. 5.4 4.1 5.0 9.2 3.2 5.5 3.1 2.7 5.8 2.4 2.4 2.4 4.8 3.7 4.4 2.5 13 12 3.4 3.0 3.0 2.7 2.6 36 3.5 3.3 37 2.0 1.8 1.8 1.6 193.3 6.24 37 1.6 383 1.62 1.87 53.49 32.04 1.8 6.7 1.5 1.5 3.9 1.2 2.8 2.5 1.5 10 1.1 2.6 27 2.5 2.0 1.8 2.6 4.2 2.1 2.1 2.2 9.4 2.8 2.4 15 2.3 2.5 2.3 2.1 2.0 1.6 126.0 4.06 27 1.1 250 1.06 1.22 2.2 2.6 10 3.3 32 3.6 75 4.9 14 4.7 11 3.7 21 3.1 5.7 12 5.5 16 3. 1 4.7 5.7 15 7.1 7.2 3.0 2.8 3.2 4.1 3.4 107 396.6 13.2 107 2.2 787 3.44 3.84 RIO PUERTO NUEVO BASIN 191 50049310 QUEBRADA JOSEFINA AT PINERO AVENUE, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.-- OCTOBER 1989 TO SEPTEMBER 1990 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURK (CFS) (UMHOS) (DBG C) (CFS) (UMHOS) (DEC C) NOV. 21 0930 6.44 357 25.5 MAY ->16 1502 2.96 428 34.0 DEC. 14 1514 6.86 374 30.5 JUNE 14 1320 4.14 403 34.5 JAN. 18 1250 2.88 364 27.0 JULY 20 0943 3.57 611 29.0 FEB. 07 1100 10.4 372 25.5 AUG. 30 1214 2.24 392 33.0 MAR. 23 1323 2.93 377 33.0 SEPT, 26 1247 1.54 539 30.0 APR. 16 1435 5.1 372 33.0 RIO PUERTO NDBVO BASIN 50049310 QUEBRADA JOSEFINA AT PINBRO AVENUE, PR—Continued WATER-QUALITY RECORDS PERIOD OP RECORDS.-- Water years 1988 to 1989. PERIOD OP DAILY RECORD.-- SUSPENDED-SEDIMENT DISCHARGE: February 1988 to September 1989. EXTREMES POR PERIOD OP DAILY RECORD.-- SEDIMENT CONCENTRATION: Maximum daily mean, 397 mg/L September 18, 1989; Minimum daily mean, 2 mg/L several days. SEDIMENT LOADS: Maximum daily mean, 1,390 tons (1,250 tonnes) September 18, 1989; Minimum daily mean, 0.0 ton (0.0 tonne) several days. EXTREMES POR WATER YEARS 1988-89.-- Water Year 1988 1989 Suspended-sediment concentration (mg/L) maximum minimum Suspended-sediment discharge (tons per day) maximum minimum 297 (Apr. 15) 397 (Sep. 18) 2 (several days) 2 (several days) 461 (Aug. 24) 1,390 (Sep. 18) 0.0 (several days) 0.0 (several days) SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 DAY MEAN DISCHARGE (CPS) MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) JANUARY MEAN MEAN CONCEN- SEDIMENT MEAN DISCHARGE TRATION DISCHARGE DISCHARGE (CFS) (MG/L) (TONS/DAY) (CPS) FEBRUARY MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) MARCH 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL e Estimated - _ 2 5 4 5 4 9 3 4- - -- __ .7 .0 .9 .1 .6 .2 .8 .3 -- -- --- _ -_ e5 10 15 18 20 24 3 22 ___ ___ —— eO.04 .14 .20 .24 .26 1.5 .04 .26 -__ __. 6. 6. 4. 3. 3. 3. 3. 3. 8. 3. 5. 6. 4. 4. 4. 22 4. 18 20 11 35 8. 3. 0 2 3 3 3 0 2 3 1 2 3 7 6 2 1 0 8 6 5 6 3 3 6 4 9 6 13 12 5 5 5 5 5 5 5 5 5 5 6 8 20 4 33 5 5 12 4 4 5 65 8 62 57 18 91 16 6 .59 .20 .06 .06 .06 .06 .06 .06 .06 .06 .06 .04 .06 .06 .16 .04 3.7 .04 .08 .22 .04 .04 .06 18 .10 6.6 5.6 .54 24 .38 .06 227.4 61.15 RIO PUERTO NOEVO BASIN 193 50049310 Q0EBRADA JOSEFINA AT PINERO AVENDE, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 DAY MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) APRIL 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 5 4 4 4 4 4 7 3 4 5 5 8 3 49 191 21 49 49 25 11 7 8 9 92 13 8 6 4 5 6 - .7 .6 .3 .3 .7 .7 .1 .6 .4 .0 .8 .5 .0 .0 .0 .1 .0 .0 .4 .9 .1 -- 6 5 5 5 6 7 22 8 6 5 5 23 4 41 297 56 2 141 60 24 12 13 15 132 39 20 10 7 15 10 ___ .10 .06 .06 .06 .08 .08 1.4 .08 .08 .06 .08 3.0 .04 88 263 13 .36 39 13 1.2 .22 .28 .36 134 3.0 .44 .16 .08 .24 . 16 ___ MEAN DISCHARGE (CFS) MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) MAY 3 3 3 152 70 34 3 3 14 2 2 3 3 4 12 2 3 6 7 5 5 4 4 4 5 4 .7 .9 .8 .4 .1 .6 .1 .1 .3 .6 .2 .4 .1 .5 .3 .6 .4 .7 .3 .6 .7 .1 .8 .6 .5 .9 10 8 7 6 5 5 5 5 172 123 56 4 4 40 3 3 4 4 4 41 5 4 20 10 10 10 6 6 6 6 6 .12 .10 .10 .08 .06 .04 .04 .04 389 69 33 .04 .04 14 .02 .02 .04 .04 .04 6.4 .04 .04 .36 .20 .16 .16 .06 .08 .08 .08 .08 MEAN DISCHARGE (CFS) MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) JUNE 5. 4. 4. 4. 4. 3. 3. 4. 3. 4. 5. 6. 5. 15 4. 4. 5. 4. 8. 25 7. 2. 1. 7. 3. 1. 2. 59 2. 2. 7 6 1 6 6 8 7 8 1 7 2 1 8 3 6 0 0 6 9 0 9 1 3 8 2 2 0 8 8 9 10 10 10 6 20 6 12 15 6 6 59 4 5 8 10 33 44 24 2 2 23 15 2 2 53 4 4 .12 .10 .10 .12 .12 .10 .06 .26 .06 .16 .22 .10 .10 11 .04 .06 .10 .24 4.9 28 2.2 .02 .02 3.4 .14 .00 .02 60 .02 .02 TOTAL 620.2 561.68 392.3 513.56 216.7 111.80 194 RIO PUERTO NDEVO BASIN 50049310 QOEBRADA JOSEFINA AT PINERO AVENUE, PR — Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) AUGUST MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 7. 2. 3. 3. 8. 6. 87 1. 1. 2. 4. 3. 4. 9. 2. 2. 4. 9. 4. 3. 3. 10 1. 2. 2. 3. 1. 1. 5. 5. 2. 1 4 1 3 9 7 6 6 5 0 0 0 1 6 5 0 7 0 9 9 7 5 3 8 8 9 1 5 8 JULY 25 3 4 4 39 16 76 2 4 4 1 3 10 33 3 3 5 28 5 4 4 35 2 3 5 20 2 2 20 20 3 1.8 .02 .04 .04 4.4 4.7 85 .00 .02 .02 .02 .02 .10 3.7 .02 .02 .06 3.5 .06 .04 .04 3.6 . 00 .02 .04 8.4 .00 .02 .28 .30 .02 2 4 18 2 2 2 11 2 4 33 4 2 2 6 2 6 13 2 1 1 2 17 7 344 14 5 16 12 19 2 7 .9 .0 .7 .4 .8 .8 .3 .5 .0 .0 .8 .1 .7 .0 .7 .6 .6 .4 .7 .5 .0 5 5 64 5 3 3 40 10 20 84 20 2 2 20 2 22 45 3 2 2 10 78 20 246 30 10 47 35 61 3 22 6 4 43 1 4 17 2 461 1 4 4 25 2 .04 .06 .3 .04 .02 .02 .6 .08 .24 .24 .02 .02 .91 .02 .9 .9 .02 .00 .00 .08 .2 . 1 .16 .1 .0 .02 .9 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) SEPTEMBER 2. 2. 2. 2. 2. 2. 2. 22 70 28 86 25 16 33 9. 10 6. 6. 9. 6. 8. 21 5. 9. 5. 5. 6. 7. 7. 7. 9 7 5 6 7 6 1 1 5 7 3 7 6 1 8 3 8 4 0 3 6 10 10 3 3 3 4 2 67 192 101 194 82 49 78 15 28 12 12 20 12 15 52 7 31 10 10 10 12 12 12 .08 .08 .02 .84 .02 .02 .02 23 63 12 81 14 3.7 22 .36 1.8 .22 .22 .50 .22 .34 13 .10 4.4 .14 .16 .18 .22 .24 .24 TOTAL 212.3 116.30 573.5 579.99 430.3 242.12 RIO PUERTO NUBVO BASIN 195 50049310 QOEBRADA JOSEPINA AT PINERO AVENUE, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) OCTOBER 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL 11 7. 9. 30 5. 5. 3. 38 2. 3. 4. 8. 5. 7. 5. 3. 3. 2. 15 3. 5. 9. 7. 5. 16 6. 4. 13 15 4. 6. 268. 4 2 1 5 7 5 8 4 5 1 5 3 3 7 6 6 6 9 1 7 3 2 2 1 3 40 24 23 97 10 10 4 78 3 10 5 53 14 17 15 5 5 4 39 6 15 29 10 12 40 17 5 39 50 5 16 ___ 5.5 2.0 1.6 20 .14 .14 .04 40 .02 .10 .06 2.9 1.2 1.0 .22 .04 .04 .02 12 .06 .22 2.1 .20 .18 9.8 1.4 .06 3.0 6.9 .06 1.5 112.50 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) NOVEMBER 2 3 3 3 3, 9 4 23 3, 4 4 7 60 4 4 14 23 6 5 5 14 12 3 2 5 9 3 2 2 2 .9 .1 .1 .3 .4 .1 .8 .9 .5 .0 .3 .9 .8 .3 .7 .6 .1 .6 .1 .4 .4 .4 .7 .8 5 5 5 5 5 25 10 66 5 6 5 19 67 6 6 37 74 10 10 10 52 45 4 3 20 31 5 3 3 3 .04 .04 .04 .04 .04 5.2 .12 17 .06 .08 .06 1.6 79 .08 .08 2.6 15 .18 .16 .16 3.0 5.1 .04 .02 .28 2.9 .04 .02 .02 .02 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) DECEMBER 2. 2. 7. 3. 3. 3. 10 4. 10 9. 5. 5. 5. 3. 5. 4. 15 5. 3. 9. 9. 22 9. 26 12 9. 5. 23 5. 7. 4. 9 7 2 7 7 7 3 0 8 0 2 1 8 3 7 5 3 6 5 2 1 7 6 0 3 3 21 4 4 4 26 6 34 31 10 8 8 4 15 12 49 8 5 30 51 104 25 101 31 20 6 75 15 14 5 .02 .02 1.6 .04 .04 .04 1.1 .06 3.2 1.5 .16 .10 .12 .04 .24 .14 9.4 .12 .04 4.1 4.3 12 1.4 12 3.5 1.4 .08 16 1. 1 .69 .06 254.2 133.02 253.6 74.61 196 RIO PUERTO NUEVO BASIN 50049310 QOEBRADA JOSEFINA AT PINERO AVENUE, PR — Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN DISCHARGE JAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 (CFS) 3. 3. 4. 4. 2. 4. 3. 26 5. 24 51 37 9. 8. 11 17 7. 9. 11 20 6. 5. 5. 9. 4. 5. 6. 6. 9. 4. 9. 0 4 7 3 8 1 6 7 8 6 1 0 5 8 4 6 7 6 1 6 1 6 9 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) JANUARY 4 5 5 5 3 5 5 104 5 91 180 156 28 18 29 72 20 9 15 65 9 9 8 28 6 10 12 24 5 32 14 .04 .04 .06 .06 .02 .06 .04 1 .08 11 42 21 .74 .42 1.6 7.7 .38 .14 .44 8. 8 .16 . 14 .12 2.9 .08 .12 .16 .22 2.4 . 06 4.2 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) FEBRUARY 3 3 3 4 3 6 2 8 10 2 4 1 2 2 20 59 21 9 4 4 4 2 6 4 3 26 41 2 .6 .0 .0 .5 .1 .7 .6 .7 .9 .6 .8 .2 .1 .5 .2 .5 .9 .2 .5 .1 .5 .6 4 3 3 6 4 18 3 30 39 3 15 2 2 2 68 128 58 29 5 6 7 5 18 5 4 62 63 3 .04 .02 .02 .08 .04 1.2 .02 3.3 5.4 .02 .90 .00 .02 .02 12 53 6.2 3.0 .06 .07 .10 .02 1.4 .06 .04 34 36 .02 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) MARCH 2 2 3 2 2 11 2 1 8 5 2 21 19 10 4 9 5 9 4 7 4 4 4 5 6 3 4 4 6 7 15 .5 .7 .0 .8 .9 .1 .8 .8 .9 .3 .6 .4 .0 .9 .5 .6 .9 .5 .5 .7 .3 .0 .4 .5 .0 .8 3 3 4 3 10 33 2 2 35 21 3 94 66 33 9 27 6 33 5 20 8 6 6 13 19 4 5 6 10 23 41 . 3. . 8. 1. 16 10 5. 3. 3. . 1. 1. 16 02 02 04 02 08 0 02 00 7 5 02 8 51 8 08 1 06 42 10 08 08 76 3 04 06 08 16 6 TOTAL 337.0 157.05 203.4 73.45 RIO PUERTO NUEVO BASIN 50049310 QDEBRADA JOSEFINA AT PINERO AVENUE, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 197 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 8 6 11 12 8 6 3 4 5 6 4 5 11 9 4 3 5 7 5 6 6 6 5 4 4 3 3 53 96 7 - .6 .9 .5 .9 .5 .3 .0 .9 .9 .7 .1 .6 .7 .0 .0 .4 .7 .6 .5 .3 .1 .4 .4 . 6 .4 -- APRIL 28 22 35 53 29 20 8 5 8 10 6 10 31 30 10 6 6 8 8 8 9 9 8 6 6 5 5 98 105 30 ___ MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) MAY 2 1 4 4 3 1 5 4 68 155 3 .4 .6 .1 .5 .3 .5 .08 .06 .10 .18 .08 .16 .3 .9 .12 .06 .08 .16 .12 .14 .16 .16 .12 .06 .08 .04 .04 .7 ___ 6 2 4 3 9 5 21 2 2 2 2 3 4 4 4 3 3 3 3 4 4 4 2 2 2 14 2 8 2 27 76 .6 .9 .2 .9 .3 .2 .5 .8 .5 .8 .6 .3 .4 .2 .8 .7 .6 .4 .0 .5 .0 .8 .6 .2 .3 .9 .1 21 3 5 5 24 8 80 3 3 3 3 4 5 5 5 5 15 4 4 5 5 5 5 3 3 48 10 38 3 59 187 2.3 .02 .06 .06 1.6 .12 11 .02 .02 .02 .01 .04 .06 .06 .06 .06 .14 .04 .04 .06 .06 .06 .04 .02 .02 13 .06 4.4 .02 15 165 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) JUNE 27 172 226 56 3 2 2 3 3 5 61 2 3 4 3 3 4 12 2 1 4 3 7 2 3 2 3 3 3 3 .8 .3 .3 .4 .9 .3 .7 .5 .1 . 9 .4 .0 .1 .9 .6 .0 .2 .8 .2 .9 .7 .2 .1 .1 84 184 198 88 4 3 3 3 4 6 81 3 4 4 4 4 5 28 2 2 15 4 25 3 3 3 3 3 3 3 17 261 348 63 .04 .02 .02 .02 .04 .08 78 .02 .04 .04 .04 .04 .06 10 .02 .02 .18 .04 2.3 .02 .02 .02 .02 .02 .02 .02 TOTAL 327.0 256.30 245.1 213.47 637.4 780.16 198 RIO PUERTO NOEVO BASIN 50049310 QUEBRADA JOSBFINA AT PINERO AVENUE, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL YEAR 5. 19 2. 4. 2. 10 24 3. 3. 4. 18 2. 47 14 4. 4. 7. 19 10 3. 3. 18 14 4. 5. 3. 24 4. 5. 7. 17 316. 5119. 6 8 0 4 6 5 1 9 7 4 5 4 3 3 4 9 1 2 5 6 9 JULY 16 42 3 10 3 36 89 4 4 5 70 3 86 35 6 5 20 61 29 4 4 62 37 5 5 5 54 5 6 20 51 --- MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) AUGUST 1, 17 3. 17 10 126 9. • ,7 ,02 ,60 ,02 ,3 ,04 ,04 ,06 ,02 ,8 ,08 .06 1.3 14 3, 11 9. 22 4. 251. 4364. ,3 ,04 ,04 ,7 .06 .08 .06 .06 .08 ,40 .0 .86 .12 7 9 20 5 9 7 11 3 5 27 5 4 17 5 25 6 57 28 26 51 9 10 25 36 37 9 57 9 107 15 15 662 .3 .5 .2 .2 .6 .2 .7 .1 .5 .8 .0 .9 .7 .5 .2 8 10 50 8 25 15 34 4 15 65 8 6 42 10 96 5 78 95 84 122 30 20 65 109 95 20 143 35 208 45 25 --- 15 3 31 11 15 54 18 13 51 17 27 24 60 125 1 1 471 .16 .26 .12 .62 .30 .2 .04 .24 .12 .08 .16 .08 .80 .54 .52 .90 .8 .0 .94 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) SEPTEMBER 13 17 15 12 13 8.1 13 22 61 41 16 17 18 37 9.2 27 17 664 19 27 16 20 56 30 23 24 26 44 20 22--- 1347.3 5 20 20 25 38 5 38 48 68 67 25 10 10 71 12 82 62 397 25 90 40 35 174 90 42 38 35 69 30 30 --- —— .18 .92 .82 .82 3.2 .10 4.1 17 93 47 1.1 .46 .48 28 .30 20 5.2 1390 1.3 15 1.7 1.9 40 11 2.6 2.5 2.5 26 1.6 1.8 --- 1720.58 199 RIO PUERTO NUEVO BASIN 50049310 QUEBRADA JOSEFINA AT PI NERO AVENUE, PR—Continued WATER QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1989 PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT DATE DEC 1987 07. .. 07... MAY 1988 09. .. JUN 28. .. JUL 07. .. FEB 1989 16. . . 26. . . MAY 26. . . 31. . . JUN 02... 11. . . JUL 13. .. AUG 10. .. DATE DEC 1987 07. .. 07. .. MAY 1988 09... JUN 28. .. JUL 07. .. FEB 1989 16. . . 26. . . MAY 26. .. 31. . . JUN 02. . . 11. . . JUL 13. .. AUG 10. .. TIME 1425 1550 1440 1555 0205 2010 1730 1155 1225 1340 0305 1515 1645 SED. SUSP. FALL DIAM. PERCENT FINER THAN .016 MM 88 76 75 74 76 65 61 39 76 35 79 62 67 DIS- CHARGE, INST. CUBIC FEET PER SECOND 155 400 1225 951 205 452 243 206 720 1435 620 1240 297 SED. SUSP. FALL DIAM. PERCENT FINER THAN .031 MM 89 85 88 80 85 72 81 48 77 48 89 79 76 SEDI- MENT, SUS- PENDED (MG/L) 761 732 1084 670 565 710 831 1100 2145 1320 907 1460 1183 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .062 MM 96 89 90 88 94 81 83 54 91 83 92 84 86 SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) 339 790 3585 1720 312 866 545 611 4170 5100 1520 4890 948 SBD. SUSP. SIEVE DIAM. PERCENT FINER THAN .125 MM 97 94 93 95 96 90 96 86 95 90 97 91 97 SED. SUSP. FALL DIAM. PERCENT FINER THAN .002 MM 57 36 27 39 40 -- 15 15 24 -- 30 18 16 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .250 MM 98 98 98 97 97 96 98 92 98 94 98 95 100 SED. SUSP. FALL DIAM. PERCENT FINER THAN .004 MM 71 48 56 47 60 42 22 20 42 20 35 30 22 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .500 MM 100 100 99 98 98 99 100 95 100 96 100 98 100 SED. SUSP. FALL DIAM. PERCENT FINER THAN .008 MM 82 69 70 56 73 54 38 21 58 30 63 45 42 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN 1.00 MM 100 100 100 100 100 100 100 100 100 100 100 100 100 200 RIO PUERTO NOBVO BASIN 50049820 LACUNA SAN JOSE NO. 2 AT SAN JUAN, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°25'46", long 66°02'10", 0.2 mi»(0.3 Jcm») east of Cafio de Martin Pefia, and 650 ft (200 m) south of Isla Guachinango. DRAINAGE AREA.--Indeterminate. PERIOD OF RECORD.--Water years 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 27. .. DEC 20. . . FEE 1990 16. . . APR 30. . . JUN 26. . . AUG 21. .. DATE OCT 1989 27. . . DEC 20. . . FEE 1990 16. . . APR 30. .. JUN 26. . . AUG 21. . . TIME 0845 1030 0915 1055 0850 1015 RESIDUE TOTAL AT 105 DEG. C, SUS- PENDED (MG/L) 9 <1 <1 3 <1 29 DEPTH AT SAMPLE LOC- ATION, TOTAL (FEET) 1.00 1.00 1.00 1.00 1.00 1.00 NITRO- GEN, NITRATE TOTAL (MG/L AS N) -- -- -- 0.01 -- 0.05 SPE- CIFIC CON- DUCT- ANCE (US/CM) 13000 9600 21000 26000 26500 24400 NITRO- GEN, NITRITE TOTAL (MG/L AS N) 0.01 <0.01 0.04 0.09 0.06 0.05 PH (STAND- ARD UNITS) 8.20 8.10 7.90 7.90 7 .40 7.50 NITRO- GEN, NO2+NO3 TOTAL (MG/L AS N) <0. 10 <0.10 <0.10 0.10 <0. 10 0.10 TEMPER- ATURE WATER (DEG C) 28.0 27.0 22.5 27.5 29.0 29.5 NITRO- GEN, AMMONIA TOTAL (MG/L AS N) 1.3 0.65 0.37 0.82 0.92 1.0 TRANS- PAR- ENCY (SECCHI DISK) (IN) 16 40 15 37 36 44 NITRO- GEN, ORGANIC TOTAL (MG/L AS N) 2.5 1.7 0.33 1.1 0.0 0.50 OXYGEN, DIS- SOLVED (MG/L) 2.0 2.6 5.0 8.0 3.3 3.3 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 3.8 2.3 0.70 1.9 0.70 1.5 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 25 32 56 101 42 42 NITRO- GEN, TOTAL (MG/L AS N) -- -- _- 2.0 -_ 1.6 COLI- FORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) 520000 K13000 K100 2600 K15000 530 NITRO- GEN, TOTAL (MG/L AS N03) -- -- -- 8.9 -- 7.1 STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) K11000 K200 K100 K100 K1100 K1000 PHOS- PHORUS TOTAL (MG/L AS P) 0.69 0.55 0.20 0.18 0.18 0.21 ALKA- LINITY WAT WH TOT FET FIELD MG/L AS CACO3 150 140 110 89 92 100 CARBON, ORGANIC TOTAL (MG/L AS C) 17 11 5.2 8.3 3.0 6.9 K = non-ideal count RIO PUERTO NUEVO BASIN 201 50049920 BAHIA DE SAN JUAN NO. 5 AT SAN JUAN, PR WATER-QUALITY RECORDS LOCATION--Lat 18°26'37", long 66°05'11", 0.4 mi a (0.6 kma ) west of Puente de la Constitucion, and 0.5 mi (0.8 kma ) south from U.S. Naval Reservation. DRAINAGE--Indeterminate. PERIOD OP RECORD--Water years 1974 to present. WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 27. . . DEC 20. .. PEB 1990 16. .. APR 30. .. JUN 26. .. AUG 21. . . DATE OCT 1989 27. .. DEC 20. .. PEB 1990 16. .. APR 30. . . JUN 26. .. AUG 21. .. TIME 1030 1315 1115 1245 1010 1135 RESIDUE TOTAL AT 105 DEG. C, SUS- PENDED (MG/L) 11 5 24 37 8 71 DEPTH AT SAMPLE LOC- ATION, TOTAL (FEET) 1.00 1.00 1.00 1.00 1.00 1.00 NITRO- GEN, NITRATE TOTAL (MG/L AS N) 0.30 -- 0.21 0. 14 0.04 0.06 SPE- CIFIC CON- DUCT- ANCE (US /CM) >50000 33800 24000 >50000 47000 43600 NITRO- GEN, NITRITE TOTAL (MG/L AS N) 0.10 0.03 0.09 0.06 0.06 0.04 PH (STAND- ARD UNITS) 7.30 7.30 7.70 8.00 7.60 7.90 NITRO- GEN, NO2+NO3 TOTAL (MG/L AS N) 0.40 <0.10 0.30 0.20 0.10 0.10 TEMPER- ATURE WATER (DEG C) 29.0 28.0 24.5 29.5 28.0 30.5 NITRO- GEN, AMMONIA TOTAL (MG/L AS N) 1.4 1.9 1.3 0.95 0.99 1.1 TRANS- PAR- ENCY (SECCHI DISK) (IN) 14 31 18 20 30 12 NITRO- GEN, ORGANIC TOTAL (MG/L AS N) 1.3 0.70 0.90 1.0 0.0 0.30 OXYGEN, DIS- SOLVED (MG/L) 4.0 4.4 8.5 7.5 5.2 5.5 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 2.7 2.6 2.2 2.0 0.50 1.4 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 52 55 100 98 65 72 NITRO- GEN, TOTAL (MG/L AS N) 3.1 -- 2.5 2.2 0.60 1.5 COLI- FORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) 220000 K83000 K18000 5100 K190000 39000 NITRO- GEN, TOTAL (MG/L AS NO3) 14 -- 11 9.7 2.7 6.6 STREP- TOCOCCI FECAL, KP AGAR (COLS. PER 100 ML) 3900 8000 2700 2000 4400 3300 PHOS- PHORUS TOTAL (MG/L AS P) 0.37 0.46 0.31 0.38 0.30 0.34 ALKA- LINITY WAT WH TOT PET FIELD MG/L AS CACO3 150 150 100 160 130 150 CARBON, ORGANIC TOTAL (MG/L AS C) 6.7 7.7 5.0 7.1 9.5 5.1 K = non-ideal count 202 THIS PAGE WAS LEFT BLANK INTENTIONALLY 203 O C E A N O ATLANTICQ V, Rio Grsnde de P i.fiGUAOU.LA"«AfiEC|80 Map area-7 .__SAN JUSN /' /- (v^u/ \ /* *""**• -v y X ^- / > / 'atillos foasiri J)_.^-/ / rsrv——J 1 / I —^ .' S— .•'^~~~—--.-^ Ri'o Suoyones bosifi ^~~3 WJAROO > WJAROO } ! EXPLANATION ^ 0509 A SURFACE-WATER STATION AND NUMBER ^0554 V QUALITY-OF-WATER STATION AND NUMBER 0575 V QUALITY-OF-WATER PARTIAL RECORD STATION AND NUMBER • 222 WELL AND WELL NUMBER 0590 H LAKE-ELEVATION STATION .MAYSSUEZ CA6UAS-, i»OKCE V 1———! ——I——"1 i IJ345 6 KILOMETERS Figure 19.—Rio Grande de Loiza basin. 204 RIO GRANDE DE LOIZA BASIN 50050300 QUEBRADA BLASINA NEAR CAROLINA, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°23'27", long 65°58'28", at bridge on Highway 3, 1.4 mi (2.3 km) south of Valle Arriba Heights housing area, and 1.2 mi (1.9 km) west-southwest of Carolina plaza. DRAINAGE AREA.—2.96 mi» (7.67 kma ). PERIOD OF RECORD.—Water years 1973 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 19. . . DEC 11. . . FEB 1990 05. . . APR 06. .. JDN 04. .. AUG 06. . . TIME 1110 1055 1105 1105 1005 1050 DIS- CHARGE, INST. CUBIC FEET PER SECOND 12 12 7.5 13 4.3 6.2 SPE- CIFIC CON- DUCT- ANCE (US/CM) 417 440 478 446 446 422 PH (STAND- ARD UNITS) 7.50 7.50 7.40 7.60 7.10 7.80 TEMPER- ATURE WATER (DEC C) 26.5 25.0 22.5 26.0 26.5 27.0 TUR- BID- ITY (NTU) 20 38 1.5 7.0 4.6 21 OXYGEN, DIS- SOLVED (MG/L) 5.4 4.4 4.8 6.4 4.5 5.5 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 66 52 54 77 55 68 OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 45 46 15 33 29 10 COLI- FORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) K71000 K17000 220000 210000 24000 20000 STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) K14000 33000 K160000 1800 2700 1500 OCT 1989 19. . . DEC 11. . . FEB 1990 05. . . APR 06. .. JUN 04. .. AUG 06. . . HARD- NESS TOTAL (MG/L AS CACO3) CACO3 160 140 HARD- NESS NONCARB WH WAT TOT FLD MG/L AS CALCIUM DIS- SOLVED (MG/L MAGNE- SIUM, DIS- SOLVED (MG/L SODIUM, DIS- SOLVED (MG/L AS CA) AS MG) AS NA) 43 8.4 23 46 10 36 11 27 27 SODIUM AD- SORP- TION RATIO ALKA- POTAS- LINITY SIUM, WAT WH DIS- TOT FET SULFIDE SOLVED FIELD TOTAL (MG/L MG/L AS (MG/L AS K) 0.8 4.1 0.9 3.0 3.6 CACO3 140 160 200 160 180 140 CHLO- SULFATE RIDE, DIS- DIS- SOLVED SOLVED (MG/L <0.5 26 <0.5 20 (MG/L AS S) AS SO4) AS CL) 24 36 SOLIDS, DATE OCT 1989 19. .. DEC 11. .. FEB 1990 05. .. APR 06. . . OUN 04. .. AUG 06.. . FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.10 -- -- 0.10 -- 0.20 SILICA, DIS- SOLVED (MG/L AS SIO2) 21 -- -- 25 _- 30 SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 234 -_ -- 256 -_ 240 RESIDUE SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, SOLVED DEC. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC (TONS SUS- , TOTAL TOTAL TOTAL TOTAL TOTAL PER FENDED (MG/L (MG/L (MG/L (MG/L (MG/L DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) 43 69 19 32 1 10 0 0 1 1 0 0 .77 .71 .26 .08 .83 .91 0. 0. 0. 0. 0. 0. 13 09 24 12 17 09 0 0 1 1 1 1 .90 .80 .5 .2 .0 .00 0. 0. 1. 0. 0. 0. 69 20 2 23 61 22 0 1 0 0 0 0 .91 .7 .90 .87 .99 .98 non-ideal count RIO GRANDE DE LOIZA BASIN 50050300 QOEBRADA BLASINA NEAR CAROLINA, PR--Continued WATER-QUALITY DATA, HATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 205 DATE OCT 1989 19.. . DEC 11.. . FEB 1990 05.. . APR 06.. . JUN 04.. . AUG 06.. . DATE OCT 1989 19. .. DEC 11.. . FEB 1990 05. .. APR 06.. . JUN 04. .. AUG 06. .. NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 1.6 1.9 2.1 1.1 1.6 1.2 IRON, TOTAL RECOV- ERABLE (UG/L AS FE) 2000 -- -- 1400 -- -- NITRO- GEN, TOTAL (MG/L AS N) 2.5 2.7 3.6 2.3 2.6 2.2 LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) 5 _- -- 9 -- -- NITRO- GEN, TOTAL (MG/L AS N03) 11 12 16 10 12 9.7 MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) 350 -- -- 520 -- -- PHOS- PHORUS ARSENIC TOTAL TOTAL (MG/L (UG/L AS P) AS AS) 0.40 <1 0.74 0.59 0.53 2 0.50 0.45 MERCURY TOTAL SELE- RECOV- NIUM, ERABLE TOTAL (UG/L (UG/L AS HG) AS SB) <0.10 <1 __ __ <0.10 <1 __ __ BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 -- -- <100 -- - — SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) <1 -- -- <1 -- -- CHRO- BORON, CADMIUM MIUM, TOTAL TOTAL TOTAL RECOV- RECOV- RECOV- ERABLE ERABLE ERABLE (UG/L (UG/L (UG/L AS B) AS CD) AS CR) <10 <1 2 __ __ 20 1 2 __ - - - - - — ZINC, TOTAL RECOV- CYANIDE ERABLE TOTAL PHENOLS (UG/L (MG/L TOTAL AS ZN) AS CN) (UG/L) 10 <0.010 <1 __ __ 20 <0.010 2 __ __ COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) <10 -- -- 10 — " METHY- LENE BLUE ACTIVE SUB- STANCE (MG/L) 0.05 -- -- 0.12 -- -- 206 RIO GRANDE DE LOIZA BASIN 50050900 RIO GRANDE DE LOIZA AT QDEBRADA ARENAS, PR LOCATION. --Lat 18°07'10", long 65°59'22", Hydrologic Unit 21010005, at intersection of Highways 181 and 9990, 0.2 mi (0.3 km) upstream from confluence with Rio Emajagua and about 7.1 mi (11.4 km) southwest of San Lorenzo. DRAINAGE AREA.--6.00 mi' (15.54 km») . WATER-DISCHARGE RECORDS PERIOD OF RECORD.--October 1977 to current year. GAGE.--Water-stage recorder. Elevation of gage is 640 ft (195 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharge, which are poor. Gage-height and precipitation satellite telemetry at station. AVERAGE DISCHARGE.--13 years (1978-90), 29.9 ftVs (0.847 mVs), 67.67 in/yr, (1,719 mm/yr), 21,600 acre-ft/yr (26.7 hmVyr); median of yearly mean discharges, 29 ftVs (0.82 mVs), 21,000 acre-ft/yr (26 hmVyr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 11,700 ftVs (331 m3/s), Nov. 5, 1983, gage height, 14.78 ft (4.505 m), from rating curve extended above 500 ft'/s (14.2 m3 /s) on basis of step-backwater analysis; minimum discharge, 2.8 ftVs (0.079 mVs) , May 5, 6, 1979. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 2,000 ftVs (56.6 m3/s) and maximum (*): Discharge (ftVs) (mVs) Gage height (ft) (m) Date Time (ff/s) (mj /s) (ft) (m) Date May 9 2100 3,570 101 9.77 2.978 Aug. 28 Minimum discharge, 4.0 ftVs (0.113 m3 /s) , Apr. 22-25, May 6,7. Discharge Time (ft 3 /s) (mV 1610 *3,780 107 Gage height (ft) (m) *9.95 3.033 DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES OCT NOV DEC MAR MAY JUN JUL 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC -FT CFSM IN. CAL YR WTR YR 21 19 18 17 17 15 15 14 17 14 13 13 13 13 14 12 11 11 11 11 10 12 11 12 11 10 9.5 9.2 9.4 13 10 406.1 13.1 21 9.2 805 2.18 2.52 1989 1990 9.4 8.8 8.5 8.6 13 9.0 8.7 9.4 9.7 8.9 8.1 7.8 7.5 7.3 7.4 7.5 7.9 8.4 9.3 9.3 8.1 7.6 7.7 7.6 7.4 8.1 7.5 7.3 7.2 7.3 --- 250.3 8.34 13 7.2 496 1.39 1.55 TOTAL 8451 TOTAL 5280 7.2 7.2 7.3 7.2 7.2 7.4 7.6 7.1 6.7 6.7 6.9 6.9 6.8 6.8 6.6 6.4 6.4 6.5 6.7 6.7 6.1 5.8 6.4 6.1 6.5 5.8 5.6 5.4 7.3 6.5 6.2 206.0 6.65 7.6 5.4 409 1.11 1.28 3 MEAN 0 MEAN 6.0 8.0 9.8 6.2 5.5 5.2 5.2 5.4 5.3 6.1 6.2 5.3 5.3 4.9 4.7 4.4 4.7 4.5 7.9 19 8.4 6.6 5.7 6.4 11 24 15 16 12 9.7 8.5 252.9 8.16 24 4.4 502 1.36 1.57 23.2 MAX 14 . 5 MAX 7.6 7.8 6.9 6.7 6.3 6.0 e6.2 e6.4 e8.0 e7.5 e7.5 e7.0 e7.0 11 7.6 7.2 7.8 11 9.1 12 18 16 24 84 15 12 10 9.2 ___ ___ --- 344.8 12.3 84 6.0 684 2.05 2.14 725 MIN 330 MIN 8.9 8.5 7.8 7.7 7.3 7.3 7.2 6.8 7.1 7.5 7.5 8.5 9.5 32 12 10 9.6 8.0 7.5 7.7 7.1 6.6 7.3 6.8 6.3 6.1 6.7 6.6 7.0 6.2 6.0 261.1 8.42 32 6.0 518 1.40 1.62 5.3 AC-FT 4.0 AC-FT 5.6 5.7 5.5 5.6 5.5 5.2 .9 .9 .8 .7 .6 .7 10 6.1 5.1 6.4 5.2 4.8 4.7 4.6 4.3 4.2 4.0 4.0 14 14 9.2 5.5 5.0 4.7 --- 177.5 5.92 14 4.0 352 .99 1.10 16760 10470 4.5 4.5 4.3 4.3 4.3 4.1 4.3 4.3 265 52 14 8.4 7.2 8.4 6.7 5.8 6.2 5.9 5.5 5.2 5.0 4.9 4.8 4.7 4.6 6.4 5.5 5.4 4.9 4.4 4.5 480.0 15.5 265 4.1 952 2.58 2.98 CFSM 3.86 CFSM 2.41 4.7 5.3 4.6 7.3 11 8.8 7.0 5.4 20 6.6 6.0 5.2 5.1 218 63 22 19 13 12 30 14 e!2 elO e30 e80 23 15 12 11 9.9 --- 690.9 23.0 218 4.6 1370 3.84 4.28 IN. 52 IN. 32 15 11 9.3 9.3 10 76 18 13 11 10 9.5 9.1 8.6 11 16 12 12 44 40 S13 11 9.8 9.1 11 90 123 22 15 13 12 11 684.7 22.1 123 8.6 1360 3.68 4.25 40 74 10 10 9.8 9.5 13 10 19 30 22 126 24 16 15 13 12 11 10 9.8 9.9 9.4 8.8 9.1 10 9.0 11 11 8.8 330 30 16 13 846.1 27.3 330 8.8 1680 4.55 5.25 12 11 11 12 10 10 10 13 11 10 9.6 10 15 37 16 35 18 56 21 15 13 11 76 17 15 43 18 80 30 34 679.6 22.7 80 9.6 1350 3.78 4.21 e Estimated RIO GRANDE DE LOIZA BASIN 50050900 RIO GRANDE DE LOIZA AT QUEBRADA ARENAS, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS AUGUST 1981 TO CURRENT YEAR STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEC C) 207 OCT. NOV. DEC. JAN. FEB. 10 1348 13 1502 12 1359 18 1214 06 1223 14.2 MAR. 15 0930 11.6 142 147 146 138 259 142 28.0 26.0 24 .0 23.0 23.5 21.5 DATE TIME APR. 13 0959 MAY 16 1500 JUNE 22 1242 JULY 17 1442 AUG. 13 1037 SEPT 08 1018 STREAMFLOW, INSTANTANEOUS (CFS) 8.89 5.85 10.9 13.8 14.0 1.94 SPECIFIC CON- TEMPERA- DUCTANCE (UMHOS) 159 151 149 150 158 270 TURE (DEC C) 23.5 28.0 27.5 27.0 25.0 26.0 208 RIO GRANDE DB LOIZA BASIN 50051150 QUEBRADA BLANCA AT EL JAGDAL, PR LOCATION.--Lat 18°09'40", long 65°58'58", Hydrologic Unit 21010005, 0.1 mi (0.2 km) upstream from bridge on Highway 181, and 2.8 mi (4.5 km) southwest of San Lorenzo. DRAINAGE AREA.--3.25 mi" (8.42 km') • WATER-DISCHARGE RECORDS PERIOD OF RECORD.--October 1984 to current year. GAGE.--Water-stage recorder. Elevation of gage is 459 ft (140 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. Gage-height and precipitation satellite telemetry at station. AVERAGE DISCHARGE.--6 years (1985-90), 8.15 ftVs (0.231 mVs), 34.05 in/yr (865 mm/yr), 5,900 acre-ft/yr (7.27 hmVyr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 7,400 ft3 /s (210 mVs), May 17, 1985, gage height, 14.58 ft (4.444 m), from floodmark, from rating curve extended above 400 ftVs (11.3 m3 /s) on basis of step-backwater analysis and slope-area measurement; minimum discharge, 0.46 ft'/s (0.013 m3 /s). May 8, 1985. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,000 ftVs (28.3 m3/s) and maximum (*): Discharge (ftVs) (mVs) Gage height (ft) (m) Date Time Aug. 10 0730 *889 25.1 *7.88 2.402 Minimum discharge, 0.45 ft3 /s (0.013 m3 /s), May 23-25. Discharge Time (ftVs) (mVs) Gage height (ft) (m) DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES OCT APR MAY JUN JUL 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC- FT CFSM IN. CAL YR WTR YR e!2 e7.9 e6.4 5.5 4.9 4.6 4.3 4.1 7.7 4.0 3.4 3.1 3.1 3.0 2.9 2.8 2.5 2.3 2.4 2.3 2.2 3.0 2.5 2.1 2.2 2.5 2.2 2.1 2.1 2.7 2.5 115.3 3.72 12 2.1 229 1.14 1.32 1989 1990 2.4 2.2 2.4 2.7 7.8 4.2 3.8 3.3 2.8 2.6 2.5 2.4 2.3 2.3 2.6 2.5 2.4 2.2 2.1 2.2 2. 0 1.8 1. 8 1.7 1.6 el. 7 el. 7 el. 6 el. 6 1.6 --- 74.8 2.49 7.8 1.6 148 .77 .86 TOTAL 2273. TOTAL 911. 1.7 1.7 1.7 1.7 1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.5 1.5 1.5 1.4 1.3 1.3 1.4 1.5 1.6 1.4 1.2 1.3 1.3 1.2 1.1 1.1 1.1 2.2 1.9 1.5 46.3 1.49 2.2 1.1 92 .46 .53 .55 MEAN .23 MEAN 1.9 2.5 1.8 1.4 1.2 1.1 1.1 1.1 1.0 1.2 1.3 1.2 1.2 1.1 1.1 1.1 1.1 1.2 1.7 6.1 2.6 1.7 1.6 1.8 1.7 4.5 2.8 2.1 1.7 1.6 1.9 55.4 1.79 6.1 1.0 110 .55 .63 6.23 MAX 2.50 MAX 1.6 2.2 1.6 1.4 1.2 1.1 1.4 1.9 2.2 2.0 1.6 1.5 1.3 2.2 1.6 1.5 1.7 1.8 1.5 1.9 2.8 3.2 3.3 4.1 2.5 2.1 2.0 2.0 ___ ___ --- 55.2 1.97 4.1 1.1 109 .61 .63 295 MIN 53 MIN 3.0 2.5 1.9 1.7 1.7 1.5 1.3 1.3 2.3 2.1 1.5 3.3 5.3 2 12 1 4.8 6.3 1 5.3 2.7 2.0 1 1.7 1 1.4 1.3 1.2 1.0 1.1 3 .96 2 .95 2 1.0 1 1.0 1.1 1.1 76.31 35 2.46 1 12 .95 151 .76 .87 .80 AC-FT .47 AC-FT .93 .91 .93 .86 .83 .78 .77 .78 .76 .74 .74 .87 .3 .3 .95 .1 .84 .78 .9 .5 .92 .78 .73 .71 .5 .8 .4 .2 .88 .79 --- .28 .18 3.5 .71 70 .36 .40 4510 1810 .77 .79 .75 .73 .81 .76 .72 .72 12 8.8 5.1 1.5 .93 1.8 .89 .74 .66 .62 .60 .60 .56 .53 .49 .48 .47 .81 .68 .63 .60 .55 .78 46.87 1.51 12 .47 93 .47 .54 CFSM 1. CFSM . .73 .86 .77 .82 3.0 2.4 2.2 1.3 1.2 1.2 1.2 1.0 1.1 15 13 9.1 4.0 2.3 1.7 1.9 1.5 1.1 1.0 1.4 5.6 5.8 3.2 2.2 1.7 1.6 --- 89.88 3.00 15 .73 178 .92 1.03 92 IN. 26. ,77 IN. 10. 1.9 1.7 1.2 1.5 1.2 4.1 4.1 3.1 1.8 1.8 1.8 1.5 1.1 1.2 1.7 1.4 4.4 2.7 6.2 2.4 1.5 1.0 .96 2.4 8.8 6.5 3.7 2.7 2.2 2.0 1.9 80.46 2.60 8.8 .96 160 .80 .92 ,02 ,43 1.7 3.1 2.9 4.8 4.6 3.2 4.5 19 15 53 21 11 11 5.4 3.6 2.9 2.3 2.1 2.1 1.9 1.3 1.5 1.5 4.5 2.1 1.4 1.0 .97 2.3 2.1 .97 194.74 6.28 53 .97 386 1.93 2.23 .80 .74 .72 3.1 .88 .68 .62 .65 .72 .63 .51 .53 .73 .76 .93 3.1 1.5 2.3 1.9 .83 .61 .55 .59 .60 2.5 2.7 4.1 3.5 2.1 .81 --- 40.69 1.36 4.1 .51 81 .42 .47 Estimated RIO GRANDE DE LOIZA BASIN 50051150 QUEBRADA BLANCA AT EL JAGUAL, PR--Continued WATER QUALITY RECORDS 209 PERIOD OF RECORD.--JANUARY 1985 TO CURRENT YEAR DATE STREAMFLOW, TIME INSTANTANEOUS (CFS) OCT. NOV. DEC. JAN. FEB. MAR. 31 03 05 12 09 12 1225 1328 1509 1257 1317 1554 6, 2. 1, 1, 2. 3, .46 .54 .68 .85 .28 .22 SPECIFIC CON- TEMPERA DUCTANCE TURE (UMHOS) 218 260 266 250 275 279 (DBG 27. 26. 25. 25. 23. 21. C) 5 5 0 0 0 5 DATE TIME APR. 06 0916 MAY 23 1552 JULY 27 1100 AUG. 17 1139 SEPT 17 1213 STREAMFLOW, INSTANTANEOUS (CFS) .83 .50 3.93 2.65 1.38 SPECIFIC CON- TEMPERA- DUCTANCE TURE (UMHOS) (DBG C) 300 290 240 270 292 25.0 30.5 26.5 27.0 27.5 210 RIO GRANDE DE LOIZA BASIN 50051150 QDEBRADA BLANCA AT EL JAGUAL, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORDS.-- Water years 1985 to 1986 and water year 1989 to current year. PERIOD OF DAILY RECORD.-- SUSPENDED-SEDIMENT DISCHARGE: October 1984 to September 1986 and from October 1989 to September 1990. EXTREMES FOR PERIOD OF DAILY RECORD.-- SEDIMENT CONCENTRATION: Maximum daily mean, 7,300 mg/L Oct. 06, 1985; Minimum daily mean, 1 mg/L several days. SEDIMENT LOADS: Maximum daily mean, 4,940 tons (23,400 tonnes) May 17, 1985; Minimum daily mean, 0.0 ton (0.0 tonne) several days. EXTREMES FOR WATER YEARS 1989-90.-- Water Year 1989 1990 Suspended-sediment concentration (mg/L) maximum minimum Suspended-sediment discharge (tons per day) maximum minimum 1,180 (Nov. 17) 355 (Aug. 10) 4 (several days) 1 (several days) 1,590 (Mar. 10) 103 (Aug. 10) 0.0 (several days) 0.0 (several days) REVISIONS.-- SEDIMENT DISCHARGE (tons/day): Nov. 03, 1984; 1,040 May 17, 1985; 3,430 May 18, 1985; 1,860 Oct. 06, 1985; 2,280 TOTAL SEDIMENT DISCHARGE (Tons/year): 1985 Water year; 24,764.21 1986 Water year; 9,503.04 SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 SEDIMENT DISCHARGE (tons/day)s Oct. 07, 1985; 426 May 08, 1986; 785 May 13, 1986; 1,010 May 14, 1986; 344 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) OCTOBER 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL 2 5 4 27 5 3 4 4 2 2 2 2 3 2 3 2 4 3 2 11 25 6 4 5 4 3 3 3 4 5 4 170 . 1 .2 .5 .0 .3 .3 .0 .8 .5 .3 .8 .6 .3 .8 .8 .4 .1 .3 .9 .8 .5 .5 .8 .4 . 8 .5 .0 .2 .5 11 50 38 300 42 35 30 25 40 20 15 20 28 24 35 22 45 25 20 126 274 70 40 40 40 30 25 30 40 40 30 __. .06 .70 .46 35 .56 .32 .34 .26 .30 .14 .10 .16 .28 .15 .36 .16 .54 .20 .12 8.6 39 1.3 .52 .60 .48 .30 .22 .30 .48 .54 .34 92.89 3 4 3 3 3 3 4 29 36 5 4 3 71 11 6 26 311 36 17 11 9 8 6 5 17 35 12 7 6 5 - 706 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) NOVEMBER .5 .1 .4 .2 .0 .2 .9 .9 .7 .6 .2 .3 .0 .6 .6 .7 .2 .5 -- .6 25 28 25 20 20 20 30 313 306 40 25 22 305 110 50 174 1180 350 200 130 100 80 70 50 164 292 150 70 55 45 --- ___ 38 70 308 3 72 1440 34 9 3 2 1 1 23 88 4 1 2107 .24 .30 .22 . 18 .16 .18 .40 .64 .32 .22 .3 .84 .2 .9 .5 .7 .2 .76 .9 .5 .92 .66 --- .24 5. 4. 4. 4. 5. 4. 4. 4. 3. 3. 3. 3. 3. 3. 3. 3. 23 5, 3. 3, 3, 4, 4, 4, 28 15 6. 7, 57 53 11 296, DECEMBER ,0 , 9 ,8 ,3 ,5 , 0 ,0 ,4 , 8 ,8 ,7 ,5 .7 ,7 .4 ,3 ,3 . 9 ,7 ,4 . 0 ,3 , 9 .6 .2 . 1 40 39 35 35 33 28 30 30 30 28 28 28 28 25 25 25 217 45 30 29 25 25 28 40 314 177 45 67 536 476 130 .54 .52 .46 .40 .50 .30 .32 .36 .30 .28 .28 .26 .28 .24 .22 .22 46 .64 .32 .28 .22 .26 .32 .52 46 15 .80 2.6 131 129 3.9 382.34 RIO GRANDS DE LOIZA BASIN 211 50051150 QUEBRADA BIANCA AT EL JAGUAL, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN DISCHARGE )AY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 (CFS) 7. 5. 4. 4. 4. 3. 3. 3. 3. 4. 9. 5. 4. 3. 3. 3. 6. 4. 4. 4. 17 4. 3. 3. 2. 2. 2. 2. 2. 2. 2. 7 6 7 4 2 9 8 7 4 3 6 4 3 7 5 3 7 5 3 3 8 6 2 9 8 8 7 6 5 4 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) JANUARY 80 50 40 34 33 32 30 25 25 30 94 60 30 25 22 22 60 35 32 35 178 40 38 20 18 18 18 16 16 15 18 1.7 .76 .50 .40 .38 .34 .31 .24 .22 .34 3.7 .88 .34 .24 .20 .20 .84 .42 .38 .40 16 .52 .36 .18 .14 .14 .14 .12 .12 . 10 .12 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) FEBRUARY 2. 2. 2, 2, 2. 2. 2. 2, 3, 2, 2, 2, 2, 2. 4 , 11 42 49 7 , 4. 36 11 6. 5. 4, 5, 3, 3, .8 .5 .5 .6 .5 .6 ,4 .9 ,1 .6 .5 .4 .4 .4 .5 .6 .6 .5 .1 .2 .1 .8 .4 18 15 15 15 15 15 15 15 15 14 14 14 14 15 21 138 434 414 70 40 269 100 60 50 35 50 30 23 .14 .10 .10 .10 .10 .10 .10 .12 .12 .10 2.5 .10 .10 .10 .26 10 87 109 1.4 .50 89 3.0 1.1 .68 .40 .68 .30 .22 MEAN MEAN CONCBN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) MARCH 3. 3. 2. 3. 12 9. 5. 4. 39 295 36 16 25 17 12 8. 7. 6. 5. 5. 4. 37 9. 5. 5. 5. 4. 3. 3. 11 33 5 1 9 1 7 0 0 8 5 4 9 7 9 4 6 0 7 5 8 5 23 20 20 20 127 107 45 31 306 902 370 190 300 160 110 90 80 60 45 42 40 236 120 40 40 40 37 27 25 94 274 6. 4. 102 1590 36 8. 20 7. 3. 2. 1. 1. 95 3. . 7. 75 21 16 16 16 4 7 60 34 2 3 6 1 6 0 72 64 52 0 60 54 62 44 27 24 8 TOTAL 142.6 30.73 230.0 307.42 641.0 1969.92 212 RIO GRANDE DE LOIZA BASIN 50051150 QUEBRADA BLANCA AT EL JAGUAL, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) MAY MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 14 6.5 5.2 4.4 3.8 3.3 3.2 14 3.8 6.8 4.5 18 7.8 6.0 4.3 4.5 4.1 3.5 2.9 2.8 2.7 2.8 2.4 2.3 2.1 2.1 2.1 1.9 2.2 2.4 ___ APRIL 165 60 40 30 20 10 22 144 35 60 38 170 100 40 35 32 35 25 20 16 15 15 12 12 10 10 10 10 12 15 ___ 8.7 1.1 .56 .36 .20 .08 .20 16 2.0 1.1 .46 27 2.1 .64 .40 .38 .38 .24 .16 . 12 .10 .12 .08 .08 .06 .06 .06 .06 .08 .10 ___ 2 3 2 3 2 9, 13 3 2 2, 1 1 1. 1 1. 1. 1. 1. 1. 1. 1. 1 1 1 1 1. 6 3 2 8 9, .4 .0 .3 .8 .9 .3 .4 .6 .1 .8 .8 .8 .8 .7 .6 .4 .5 .4 .3 .3 .2 .2 .2 .2 .5 .5 .6 .5 .6 .5 13 15 15 18 20 191 138 22 16 10 8 8 8 8 7 6 6 5 5 5 5 4 4 4 4 6 66 25 15 96 100 .08 .12 .05 .18 .16 7.2 8.5 .20 .12 .06 .04 .04 .04 .04 .04 .02 .02 .02 .02 .02 .02 .02 .02 .02 .02 .02 1.5 .24 .10 4.2 3.7 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) JUNE 6. 7. 24 11 6. 4. 3. 2. 2. 2. 3. 2. 1. 1. 1. 1. 3. 2. 2. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 7 2 3 3 4 7 2 0 0 1 9 7 6 7 3 0 0 7 5 5 5 4 4 2 1 0 6 1 60 70 169 82 60 33 25 17 12 10 10 10 10 16 15 16 35 10 9 8 6 6 6 5 5 4 4 4 5 5 1.1 1.4 21 2.4 1.0 .38 .22 .12 .08 .06 .08 .06 .06 .08 .06 .08 .32 .06 .04 .04 .02 .02 .02 .02 .02 .02 .02 .02 .02 .02 TOTAL 146.4 62.98 99.2 26.83 104.1 28.84 RIO GRANDE DE LOIZA BASIN 50051150 QOEBRADA BLANCA AT EL JAGUAL, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 213 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CPS) (MG/L) (TONS/DAY) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL YEAR e Ef 1. 4. 2. 1. 11 9. 12 5. 3. 2. 1. 3. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 3. 1. 1. 3. 7. 3. 1. 1. 1. 94. 0 0 4 3 4 6 0 0 7 6 5 2 4 0 0 5 7 3 1 2 0 6 4 2 1 9 6 1 5 3 JULY 4 30 10 6 136 101 141 50 20 10 6 22 6 5 6 4 4 6 6 5 4 4 22 6 5 20 72 30 6 5 5 --- 3210.35 jtimated MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) AUGUST .02 .32 .06 .02 5.5 3.2 5.5 .76 .16 .06 .02 .22 .02 .02 .02 .02 .02 .02 .02 . 02 .02 .02 .18 .02 . 02 .18 3.7 .32 .87 .02 .02 21.37 5756.34 1 1 3 2 1 9 3 2 1 1 1 14 5 35 13 7 4 4 5 3 2 14 4 6 10 4 166 .3 .1 .96 .3 .7 .1 .84 .84 .80 .81 .2 .1 .0 .7 .3 .8 .3 .5 . 0 .3 . 8 .8 . 6 . 0 . 0 . 6 .75 6 4 4 35 20 4 4 4 4 4 66 20 8 6 5 6 154 49 354 150 70 35 40 55 20 15 139 25 53 112 38 ... .02 .02 .02 1.3 .14 .02 .00 .00 .00 .00 8.4 .16 .04 .02 .02 .02 11 1.5 68 9.6 1.4 .38 .46 .86 .20 4 .2 11 .26 1.3 4.1 .48 124.92 3. 2. 3. 2. 2. 2. 2. 1. 2. 8. 6. 8. 4. 17 4. 4. 9. 144 15 7. 6. 24 54 e9. e9. e8. e8. e!6 e!5 e8. -- 412. SEPTEMBER 3 7 2 5 2 1 0 9 1 4 6 9 5 9 8 7 0 0 4 7 8 3 8 - 8 20 16 15 14 12 10 10 10 10 183 73 101 44 167 40 20 89 408 200 60 50 226 435 102 70 70 60 175 100 80 ... ... .18 .12 .12 .10 .08 .06 .06 .06 .06 6.8 1.7 3.8 2.1 13 .52 11 4.7 298 8.1 1.1 4.5 58 139 3.9 1.8 1.7 1.3 33 4.1 1.9 --- 600.86 214 RIO GRANDE DE LOIZA BASIN 50051150 QOEBRADA BLANCA AT EL JAGUAL, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 IAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN DISCHARGE (CFS) e!2 e7.9 e6.4 5.5 4.9 4.6 4.3 4.1 7.7 4.0 3.4 3.1 3.1 3.0 2.9 2.8 2.5 2.3 2.4 2.3 2.2 3.0 2.5 2.1 2.2 2.5 2.2 2.1 2.1 2.7 2.5 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) OCTOBER 109 62 45 22 19 18 15 14 41 11 10 10 7 7 7 7 5 5 3 4 3 8 5 5 5 5 5 5 5 6 6 TOTAL 115.3 6.9 1.4 .78 .32 .26 .22 .18 .16 1.4 . 12 .10 .08 . 06 .06 .06 .06 .04 .04 .02 .02 .02 . 06 .04 . 02 .02 .04 .02 .02 .02 .04 .04 12. 62 MEAN MEAN CONCEN- SEDIMENT MEAN DISCHARGE TRATION DISCHARGE DISCHARGE (CPS) (MG/L) (TONS/DAY) (CFS) NOVEMBER 2 2 2 2 7 4 3 3 2 2 2 2 2 2 2 2 2 2 2 2 2 1 1 1 1 el el el el 1 - .4 .2 .4 .7 .8 .2 .8 .3 .8 .6 .5 .4 .3 .3 .6 .5 .4 .2 .1 .2 .0 .8 .8 .7 .6 .7 .7 .6 .6 .6 -- 6 5 6 9 43 12 11 9 6 6 5 5 5 5 5 5 5 5 5 5 4 4 3 3 3 3 3 3 5 4 ___ .04 .02 .04 .06 1.1 .14 .12 .08 .04 .04 .04 .04 .04 .04 .04 .04 .04 .02 .02 .02 .02 .02 .02 .02 .02 .02 .02 .02 .02 .02 ___ 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 2. 1. 1. 7 7 7 7 6 6 6 6 6 6 6 5 5 5 4 3 3 4 5 6 4 2 3 3 2 1 1 1 2 9 5 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) DECEMBER 4 11 14 12 10 9 8 7 5 3 2 2 2 2 2 2 2 2 2 2 2 2 2 10 6 2 74.8 46.3 .02 .02 .02 .02 .02 .02 .04 .06 .06 .04 .04 .04 .02 .02 .02 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .06 .04 .00 0.56 e Estimated RIO GRANDE DE LOIZA BASIN 215 50051150 QDEBRADA BLANCA AT EL JAGUAL, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) JANUARY 1.9 2.5 1.8 1.4 1.2 1.1 1.1 1.1 1.0 1.2 1.3 1.2 1.2 1.1 1.1 1.1 1.1 1.2 1.7 6.1 2.6 1.7 1.6 1.8 1.7 4.5 2.8 2.1 1.7 1.6 1.9 4 10 5 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 3 32 7 2 2 2 2 20 7 2 2 2 2 .02 .06 .02 .00 .00 .00 .00 .00 .00 .00 .00 .00 . 00 .00 .00 .00 .00 .00 .02 1.0 .04 .00 .00 .00 .00 .24 .06 .02 .00 .00 .02 1 2 1 1 1 1 1 1 2 2 1 1 1 2 1 1 1 1 1 1 2 3 3 4 2 2 2 2 - _ - MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) FEBRUARY .6 .2 .6 .4 .2 .1 .4 .9 .2 .0 .6 .5 .3 .2 .6 .5 .7 .8 .5 .9 .8 .2 .3 .1 .5 .1 .0 .0 -- -- -- 2 5 5 5 5 5 5 5 5 5 5 5 5 5 5 4 5 5 5 5 5 5 5 7 6 6 6 6 ___ ___ ___ .00 .02 .02 .02 .02 .02 .02 .02 .02 .02 .02 .02 .02 .02 .02 .02 .02 .02 .02 .02 .04 .04 .04 .06 .04 .02 .02 .02 ___ ___ ___ 3 2 1 1 1 1 1 1 2 2 1 3 5 12 4 6 5 2 2 1 1 1 1 1 1 1 1 1 1 MARCH .0 .5 .9 .7 .7 .5 .3 .3 .3 .1 .5 .3 .3 .8 .3 .3 .7 .0 .7 .4 .3 .2 .0 .1 .96 .95 .0 .0 .1 .1 6 6 4 2 2 2 2 2 2 2 2 5 10 76 15 26 20 6 4 3 2 2 2 2 2 2 2 2 2 2 2 .04 .04 .02 .00 .00 .00 .00 .00 .00 .00 .00 .04 .14 3.0 .20 .44 .28 .04 .02 .02 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 TOTAL 55.4 1.50 55.2 0.66 76.31 4.28 216 RIO GRANDE DE LOIZA BASIN 50051150 QOEBRADA BLANCA AT EL JAGUAL, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) .93 .91 .93 .86 .83 .78 .77 .78 .76 .74 .74 .87 2.3 1.3 .95 1.1 .84 .78 1.9 1.5 .92 .78 .73 .71 3.5 2.8 2.4 1.2 .88 .79 --- APRIL 2 2 2 2 2 1 1 1 1 1 1 1 5 2 2 1 1 1 4 1 1 1 1 1 14 8 3 1 1 1 --- MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) MAY .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .04 .01 .00 .00 .00 . 00 .04 .01 . 00 . 00 . 00 .00 .30 .08 . 02 .00 .00 .00 --- .77 .79 .75 .73 .81 .76 .72 .72 12 8.8 5.1 1.5 .93 1.8 .89 .74 .66 .62 .60 .60 .56 .53 .49 .48 .47 .81 .68 .63 . 60 .55 .78 1 1 1 1 1 1 1 1 108 48 24 11 8 7 4 3 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 .00 .00 .00 .00 .00 .00 .00 .00 34 1.8 .46 .04 .02 .03 .01 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 3 2 2 1 1 1 1 1 1 15 13 9 4 2 1 1 1 1 1 1 5 5 3 2 1 1 JUNE .73 .86 .77 .82 .0 .4 .2 .3 .2 .2 .2 .0 .1 .1 .0 .3 .7 .9 .5 .1 .0 .4 .6 .8 .2 .2 .7 .6 --- 1 1 1 1 10 5 3 1 1 1 1 1 1 180 36 53 13 5 4 3 2 2 1 2 25 14 8 3 2 2 --- .00 .00 .00 .00 .14 .03 .02 .00 .00 .00 .00 .00 .00 44 1.6 1.8 .16 .03 .02 .01 .00 .00 .00 .00 .52 .24 .08 .03 .01 .00 ___ TOTAL 35.28 0.50 46.87 36.36 89.88 48.69 RIO GRANDS DE LOIZA BASIN 217 50051150 QUBBRADA BLANCA AT EL JAGUAL, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) JULY AUGUST SEPTEMBER 1 1.9 2 .01 1.7 2 .00 .80 1 .00 2 1.7 2 .01 3.1 6 .06 .74 1 .00 3 1.2 2 .00 2.9 6 .06 .72 1 .00 4 1.5 2 .00 4.8 20 .B2 3.1 10 .14 5 1.2 2 .00 4.6 17 .22 .88 1 .00 6 4.1 15 .24 3.2 8 .07 .68 1 .00 7 4.1 5 .05 4.5 18 .37 .62 1 .00 8 3.1 2 .02 19 126 8.6 .65 1 .00 9 1.8 2 .01 15 106 5.0 .72 1 .00 10 1.8 2 .01 53 355 103 .63 1 .00 11 1.8 2 .01 21 183 11 .51 1 .00 12 1.5 2 .00 11 50 1.6 .53 1 .00 13 1.1 2 .00 11 67 2.7 .73 1 .00 14 1.2 2 .00 5.4 22 .36 .76 1 .00 15 1.7 2 .01 3.6 9 .09 .93 1 .00 16 1.4 2 .00 2.9 6 .05 3.1 9 .12 17 4.4 21 .48 2.3 5 .03 1.5 2 .01 18 2.7 11 .11 2.1 6 .04 2.3 2 .02 19 6.2 28 .60 2.1 8 .06 1.9 2 .00 20 2.4 5 .04 1.9 10 .05 .83 1 .00 21 1.5 3 .01 1.3 7 .03 .61 1 .00 22 1.0 1 .00 1.5 4 .01 .55 1 .00 23 .96 1 .00 1.5 3 .00 .59 1 .00 24 2.4 9 .14 4.5 13 .21 .60 1 .00 25 8.8 43 1.1 2.1 4 .03 2.5 6 .08 26 6.5 34 .66 1.4 1 .00 2.7 8 .11 27 3.7 12 .13 1.0 1 .00 4.1 14 .22 28 2.7 5 .04 .97 1 .00 3.5 7 .08 29 2.2 3 .02 2.3 6 .06 2.1 4 .02 30 2.0 2 .02 2.1 7 .06 .81 1 .00 31 1.9 2 .01 .97 1 .00 --- --- --- TOTAL 80.46 --- 3.73 194.74 --- 134.28 40.69 --- 0.80 YEAR 911.23 246.20 218 RIO GRANDE DE LOIZA BASIN 50051150 QOEBRADA BLANCA AT EL JAGOAL--Continued SILT AND CLAY PERCENT OF SUSPENDED SEDIMENT DATE MAY 1990 09. .. 09. .. 09. .. 09. .. 09. . . 09. . . JUN 13. .. TIME 2139 2140 2143 2147 2200 2210 STREAM- FLOW, INSTAN- TANEOUS 245 343 441 480 107 115 SEDI- MENT, SUS- PENDED 673 977 1160 956 992 1230 SEDI- MENT, DIS- CHARGE, SUS- PENDED 646 905 1381 1239 287 382 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN 60 65 76 83 89 88 1533 2440 764 97 RIO GRANDE DE LOIZA BASIN 50051180 QUEBRADA SALVATIERRA NEAR SAN LORENZO, PR LOCATION.--Lat 180 10'24", long 65°58'38", Hydrologic Dnit 21010005, on left downstream side of bridge on Highway 181, 0.2 mi (0.3 km) upstream from Rio Grande de Loiza, and 1.5 mi (2.4 km) southwest of San Lorenzo. 219 DRAINAGE AREA.--3.74 mi J (9.69 km»). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--January 1984 to current year. GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 330 ft (100 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. Gage-height and precipitation satellite telemetry at station. AVERAGE DISCHARGE.--5 years (1985-89), 8.03 ft3/s (0.227 m3/s), 29.16 in/yr (741 mm/yr), 5,820 acre-ft/yr (7.18 hm'/yr) . --6 years (1985-90), 7.23 ft3/s (0.205 m3/s), 26.25 in/yr (667 mm/yr), 5,240 acre-ft/yr (6.46 hmVyr) . EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 9,320 ft3 /s (264 m'/s). May 17, 1985, gage height, 17.10 ft (5.212 m) , from floodmark, from rating curve extended above 200 ft3/s (5.66 m'/s) on basis of step-backwater analysis and slope-area measurement; minimum discharge, 0.26 ft3 /s (0.007 m3 /s). May 30,31, 1990. EXTREMES FOR WATER YEARS 1989-90.--Peak discharges greater than base discharge of 1,000 ft3/s (28.3 m'/s) and maximum (*) Date Time Nov. 17,1988 0315 Mar. 10,1989 1000 Sept.18,1989 0900 Discharge (ft3/s) (m3/s) *2, 090 1,450 1,910 59.2 41.1 54.1 Gage (ft) *10.53 9.34 10.43 height (m) 3.210 2.847 3.179 Date Discharge Time. (ft3/s) (m3/s) Gage height (ft) (m) Sept. 22,1989 1015 1,140 32.3 Sept. 23,1989 2230 1,560 44.2 June 14,1990 1600 *446 12.6 8.63 9.68 •6.28 2.630 2.950 1.914 Minimum discharge, 1.2 ft3 /s (0.034 m3 /s), Aug. 10, 1989.; 0.26 ft3 /s (0.007 m3 /s). May 30,31, 1990. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV JAN FEB JUN AUG SEP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC- FT CFSM IN. CAL YR WTR YR e2.8 e2.9 e2.8 e!9 eS.4 e4.5 eS.O e3.8 e3.5 e3.3 e3.2 e2.9 e4 .0 e3.3 e2.8 e2 .7 e4.1 e3.0 e2.6 e6.1 elO e4.2 e3.5 e6.6 e3.6 e3.5 e3.3 e3.7 e3.1 e2.9 e2.8 134.9 4.35 19 2.6 268 1.16 1.34 1988 1989 e2.7 e2.6 e2.5 e2.4 2.4 2.4 2.9 4.6 8.2 3.2 3.2 2.8 52 10 6.9 7. 6 213 18 7.5 5.2 4.4 4.4 3.9 3.7 13 7.2 4.6 4.0 3.9 3.8 413.0 13.8 213 2.4 819 3.68 4.11 TOTAL 2563 TOTAL 2894 3.8 3.8 3.8 3.7 3.4 3.1 3.1 3.1 3.0 3.2 3.0 2 .9 3.0 2.9 2.8 2.8 9.0 3.8 3.0 2.8 2.7 2.7 3.0 3.3 4.7 4 .8 3.6 3.2 23 25 5.2 151.2 4.88 25 2.7 300 1.30 1.50 .4 MEAN 7, .2 MEAN 7, 4.5 3.4 3.1 2.8 2.6 2.4 2.2 2.2 2.1 2.1 2.6 2.8 2.5 2.2 2.0 2.0 2.5 2.3 2.2 2.1 3.3 2.2 1. 9 1.8 1. 8 1.7 1.7 1.6 1.6 1.6 1.6 71.4 2.30 4.5 1. 6 142 .62 .71 . 00 MAX . 93 MAX 1.6 1.5 1.5 1.6 1.4 1.4 1.3 1.6 1.5 1.4 1.4 1.4 1.3 1.3 3.2 3.7 20 26 5.4 3.7 10 6.0 4.0 3.4 3.1 3.4 3.0 2.7 ___ ___ --- 117.8 4.21 26 1.3 234 1.12 1.17 213 MIN 320 MIN 2.6 e!2 2.5 2.4 2.5 3.7 9.6 4.2 3.0 21 197 30 15 24 21 e!3 ell elO e6.2 eS.6 e5.4 e5.2 e25 e!2 e7.1 e5.5 e5.1 e4.8 e4.4 e4.0 e25 e52 539.8 17.4 197 2.4 1070 4 .66 5.37 1.0 AC-FT 1.3 AC-FT e7.0 e4.7 e3.5 3.1 2 .8 2 .7 23 4.5 13 5.2 16 25 10 5.8 5.3 4.1 3.6 3.4 3.3 3.2 3.2 2.9 2.8 2.6 2.5 2.5 2.1 2.2 3.0 --- 185.0 6.17 25 2.1 367 1.65 1.84 5080 5740 2.4 2.6 2.3 2.5 2.2 4.3 4. 0 2.3 2. 1 e2.2 e2. 0 e2. 0 e2.0 el. 9 el. 8 el. 7 el. 6 el. 7 el. 6 el. 6 el. 6 el. 5 el. 5 el. 5 el. 6 e2.0 e5.0 e4.0 e2.7 e6. 0 elO 82.2 2.65 10 1.5 163 .71 .82 CFSM 1.87 CFSM 2.12 e2.9 2.1 22 10 4.1 2.8 2.3 2.0 1.9 1.9 2.7 1.9 1.7 1.6 1.5 1.5 1.9 1.8 1.7 1.5 1.4 1.8 1.6 1.6 1.6 1.6 1.7 1.6 1.9 1.8 --- 86.4 2.88 22 1.4 171 .77 .86 IN. 25.50 IN. 28.79 1.7 6.7 3.2 2.3 11 5.1 7.4 4.2 2.9 2.2 2.1 3.8 2. 1 1.8 1.7 1.5 1.4 1.4 1.6 1.7 1.4 1.4 1.5 1.5 1.5 2.8 4.5 2.8 1.7 1.5 2.0 88.4 2.85 11 1.4 175 .76 .88 1.7 1.5 1.4 4.7 3.8 1.6 1.4 1.3 1.3 1.3 5.8 5.4 5.1 5.0 3.3 3.2 11 7.9 21 11 8.8 3.9 5.2 9.7 3.6 2.4 6.4 2.5 5.5 5.9 2.6 155.2 5.01 21 1.3 308 1.34 1.54 2.7 2.9 3.5 2.4 2.0 1.9 1.7 1.6 1.7 12 11 9.6 6.0 22 7.2 5.7 11 320 21 15 24 73 156 58 18 14 13 22 17 13 --- 868.9 29.0 320 1.6 1720 7.74 8.64 e Estimated 220 DAY RIO GRANDE DE LOIZA BASIN 50051180 QUEBRADA SALVATIERRA MR SAN LORENZO, PR--Continued DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES JAN MAR APR MAY JUN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC- FT CFSM IN. CAL YR WTR YR 44 15 9.5 6.2 8.4 8.3 8.5 7.5 8.3 6.3 7.1 6.0 5.6 5.3 4.5 3.5 3.6 3.5 3.1 2.5 2.7 5.5 3.9 2.8 2.7 2.7 2.7 2.6 2.6 2.7 2.6 200.2 6.46 44 2.5 397 1.73 1.99 1989 1990 2.0 1.7 1.9 2.2 3.2 2.6 3.6 3.6 3.1 2.5 2.2 2.1 3.6 5.3 4.0 3.1 3.0 2.8 2.9 2.7 2.6 2.5 2.5 2.4 2.3 2.4 2.4 e2.3 e2.2 e2.0 --- 81.7 2.72 5.3 1.7 162 .73 .81 TOTAL 2513 TOTAL 1162 e2.0 el. 8 el. 6 el. 6 el. 6 1.5 1.5 1.4 1.4 1.4 1.4 1.4 1.1 1.1 1.1 1.1 1.0 1.0 .86 .89 1.0 .96 .88 .84 .83 .83 .79 .79 .87 .92 .93 36.39 1.17 2.0 .79 72 .31 .36 .39 MEAN .60 MEAN .96 .80 1.0 .93 .85 .83 .83 .79 .75 .81 .72 .66 .80 .77 .81 .93 .93 .91 1.2 4.0 2.2 1.4 1.3 1.8 1.2 1.8 1.6 1.4 1.0 1.1 .99 36.07 1.16 4.0 .66 72 .31 .36 6.89 MAX 3.19 MAX .97 1.6 . 94 .93 .93 1.3 2.1 2.3 1.9 1.5 1.2 1.0 .83 1.8 .90 .83 .84 .84 .75 .86 1.2 1.6 1.6 1.8 1.1 1. 0 .93 .91 ___ __- --- 34.46 1.23 2.3 .75 68 .33 .34 320 MIN 61 MIN 1.4 1.0 .80 .75 .75 .68 .58 .62 1.2 1.1 .83 3.7 3.2 12 3.0 7.9 5.7 1.9 1.3 1.2 1.1 1.0 .93 .91 .89 .96 .90 .89 .92 1.0 1.1 60.21 1.94 12 .58 119 .52 .60 .79 .29 .83 .83 .75 .75 .73 .69 .67 .72 .70 .67 .60 .67 3.0 1.4 .95 1.2 .83 .75 5.1 6.0 1.6 1.0 .91 .85 7.6 4.9 1.7 1.2 .93 .84 --- 49.37 1.65 7.6 .60 98 .44 .49 AC- FT 4990 AC-FT 2310 .67 .72 .73 .61 .65 .48 .43 .42 5.2 14 11 1.7 .90 1.7 .76 .52 .46 .44 .42 .44 .41 .39 .40 .40 .38 1.1 .58 .42 .34 .31 .50 47.48 1.53 14 .31 94 .41 .47 CFSM 1. CFSM . .48 .59 .52 .59 7.0 6.4 4.2 1.4 1.7 1.7 .99 .93 .85 46 31 23 9.1 3.8 1.8 1.9 1.0 .79 .60 1.2 8.1 5.4 1.6 1.0 .73 .60 --- 164.97 5.50 46 .48 327 1.47 1.64 84 IN. 25. 85 IN. 11. .87 .90 .58 .78 .78 10 7.3 6.4 1.7 1.3 1.1 1.2 .72 .67 3.6 1.5 7.5 6.4 13 4.8 1.7 1.1 .86 6.7 21 14 7.7 3.0 1.7 1.1 .86 130.82 4.22 21 .58 259 1.13 1.30 ,00 .56 .70 3.7 3.7 15 11 3.6 1.9 31 15 61 30 13 29 15 7.3 3.7 2.3 1.5 1.5 1.1 2.2 3.0 1.3 2.1 1.3 .74 .56 .53 .56 .89 .43 264.61 8.54 61 .43 525 2.28 2.63 .37 .34 .40 2.2 .51 .49 1.6 1.6 .56 .49 .32 .29 .48 .55 .52 5.0 1.5 1.4 1.3 .65 .51 .61 1.3 .89 10 10 6.4 4.1 1.2 .74 --- 56.32 1.88 10 .29 112 .50 .56 e Estimated WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS FEBRUARY 1984 TO CURRENT YEAR SPECIFIC CON- TEMPERA- DUCTANCE TURE (UMHOS) (DEG C) DATE TIME OCT. 03 1608 NOV. 03 1016 DEC. 05 1214 JAN. 12 1439 FEB. 09 0937 STREAMFLOW, INSTANTANEOUS (CFS) 7.48 2.07 1.46 .85 1.53 MAR. 12 1312 3.62 262 374 402 355 398 378 28.5 24.5 23.0 24.5 21.5 23.5 DATE TIME APR. 06 1249 MAY 14 1350 JULY 06 1324 AUG. 10 1032 SEPT 17 1510 STREAMFLOW, INSTANTANEOUS (CFS) .72 2.00 7.26 28.6 1.26 SPECIFIC CON- TEMPERA- DUCTANCE TURE (UMHOS) (DEG C) 405 348 320 154 378 29.5 30.0 26.0 24.5 29.5 RIO GRANDE DE LOIZA BASIN 50051180 QOEBRADA SALVATIERRA NEAR SAN LORENZO, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORD.-- Water years 1984 to 1986 and water years 1989 to current year. PERIOD OF DAILY RECORD.-- SUSPENDED-SEDIMENT DISCHARGE: October 1984 to September 1986 and from October 1989 to September 1990. EXTREMES FOR PERIOD OF DAILY RECORD.-- SEDIMENT CONCENTRATION: Maximum daily mean, 7,300 mg/L Oct. 06, 1985; Minimum daily mean, 1 mg/L several days. SEDIMENT LOADS: Maximum daily mean, 4,940 tons (23,400 tonnes) May 17, 1985; Minimum daily mean, 0.0 ton (0.0 tonne) several days. EXTREMES FOR WATER YEARS 1989-90.-- 221 Water Suspended -sediment concentration (mg/L) Suspended-sediment discharge (tons per day) Year maximum minimum maximum minimum 1989 958 (NOV. 17) 2 (several days) 2,650 (Nov. 17) 0.0 (several days) 1990 260 (Aug. 10) 1 (several days) 91 (Jun. 14) 0.0 (several days) SEDIMENT DISCHARGE, SUSPENDED ( TONS / DAY ), WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) OCTOBER 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 e2 e2 e2 e!9 e5 e4 e5 e3 e3 e3 e3 e2 e4 e3 e2 e2 e4 e3 e2 e6 elO e4 e3 e6 e3 e3 e3 e3 e3 e2 e2 .8 .9 .8 .4 .5 .0 .8 .5 .3 .2 .9 .0 .3 .8 .7 .1 .0 .6 .1 .2 .5 .6 .6 .5 .3 .7 .1 .9 .8 9 9 9 61 10 10 10 9 9 9 9 8 8 7 7 7 8 7 7 17 26 10 8 17 9 7 6 6 6 6 6 .06 .08 .06 5.2 .14 .12 . 14 .10 .08 .08 .08 .06 .08 .06 .06 .06 .08 .06 .04 .45 1.3 .12 .08 .60 .08 .06 .06 .06 .06 .04 .04 e2 e2 e2 e2 2 2 2 4 8 3 3 2 52 10 6 7 213 18 7 5 4 4 3 3 13 7 4 4 3 3 - NOVEMBER .7 .6 .5 .4 .4 .4 .9 .6 .2 .2 .2 .8 .9 .6 .5 .2 .4 .4 .9 .7 .2 .6 .0 .9 .8 -- 6 6 5 5 5 5 6 11 22 5 5 5 216 28 17 20 958 48 15 11 9 8 7 7 43 18 8 7 7 7 ___ .04 .04 .04 .04 .04 .04 .04 .17 .90 .04 .04 .04 260 .85 .32 1.0 2650 2.9 .30 .16 .10 .10 .08 .06 5.5 .56 .10 .08 .08 .08 ___ 3. 3. 3. 3. 3. 3. 3. 3. 3. 3. 3. 2. 3. 2. 2. 2. 9. 3. 3. 2. 2. 2. 3. 3. 4. 4. 3. 3. 23 25 5. DECEMBER 8 8 8 7 4 1 1 1 0 2 0 9 0 9 8 8 0 8 0 8 7 7 0 3 7 8 6 2 2 7 7 7 7 6 6 6 6 6 6 6 6 6 6 6 6 25 8 6 6 5 5 5 7 10 11 7 6 66 82 12 .08 .08 .08 .06 .06 .06 .06 .06 .04 .06 .04 .04 .04 .04 .04 .04 1.4 .08 .04 .04 .04 .04 .04 .06 .14 .23 .06 .06 6.8 13 .16 TOTAL 134.9 9.59 413.0 2923.74 151.2 23.07 e Estimated 222 RIO GRANDE DE LOIZA BASIN 50051180 QUEBRADA SALVATIERRA NEAR SAN LORENZO, PR-Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN DISCHARGE IAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 (CFS) 4. 3. 3. 2. 2. 2. 2. 2. 2. 2. 2. 2. 2. 2. 2. 2. 2. 2. 2. 2. 3. 2. 1. 1. 1. 1. 1. 1. 1. 1. 1. 5 4 1 8 6 4 2 2 1 1 6 8 5 2 0 0 5 3 2 1 3 2 9 8 8 7 7 6 6 6 6 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) JANUARY 10 7 6 5 5 5 4 4 4 4 4 5 5 4 4 4 5 5 4 4 6 4 3 3 3 3 3 3 3 3 3 TOTAL 71.4 .12 .06 .06 . 04 .04 .04 .02 .02 .02 .02 .02 .04 .04 .02 .02 .02 .04 .04 .02 .02 . 06 .02 .02 .02 .02 .02 .02 .02 .02 .02 . 02 0.98 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CPS) (MG/L) (TONS/DAY) FEBRUARY 1 1 1 1 1 1 1 1 1 1 1 1 1 1 3 3 20 26 5 3 10 6 4 3 3 3 3 2 .6 .5 .5 .6 .4 .4 .3 .6 .5 .4 .4 .4 .3 .3 .2 .7 .4 .7 .0 .0 .4 .1 .4 .0 .7 3 3 3 3 3 3 3 3 3 3 3 3 3 3 10 10 58 86 12 9 29 13 8 6 5 6 6 5 .02 .02 .02 .02 .02 .02 .02 .02 .02 .02 .02 .02 .02 .02 .08 .10 4.8 13 .18 .08 2.1 .22 .08 .06 .04 .06 .04 .04 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) MARCH 2 2 2 2 3 9 4 3 21 197 30 15 24 21 e!3 ell elO e6 e5 e5 e5 e25 e!2 e7 e5 e5 e4 e4 e4 e25 e52 .6 .5 .4 .5 .7 .6 .2 .0 .2 .6 .4 .2 .1 .5 .1 .8 .4 .0 5 5 5 5 6 27 9 6 67 886 92 40 71 67 43 45 38 14 13 12 12 102 32 17 12 11 10 9 8 101 257 .04 .04 .04 .04 .06 1.9 .10 .04 11 2350 8.9 1.6 5.4 6.3 1.9 2.5 1.6 .24 .20 .18 .16 32 1.0 .32 .18 .16 .12 .10 .08 33 178 117.8 21.16 539.8 2637.20 e Estimated RIO GRANDE DE LOIZA BASIN 50051180 QUEBRADA SALVATIERRA NEAR SAN LORENZO, PR-Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 223 MEAN DISCHARGE )AY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 (CFS) e!2 e7. e4. e3. 3. 2. 2. 23 4. 13 5. 16 25 10 5. 5. 4. 3. 3. 3. 3. 3. 2. 2. 2. 2. 2. 2. 2. 3. -- 0 7 5 1 8 7 5 2 8 3 1 6 4 3 2 2 9 8 6 5 5 1 2 0 - MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) APRIL 3 11 10 10 9 6 5 75 8 36 10 46 75 16 11 10 9 7 6 6 6 6 5 5 5 6 5 5 5 6 185.0 .08 .20 .12 . 10 . 08 .04 . 04 16 .10 2.3 .14 4.4 7.9 .44 .18 .14 .10 .06 .06 .06 .06 .06 . 04 .04 .04 .04 .04 . 02 .02 .04 32.94 MEAN DISCHARGE (CFS) MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) MAY 2 2 2 2 2 4 4 2 2 e2 e2 e2 e2 el el. el, el el el el el el el el el e2 e5 e4 e2 e6 elO .4 .6 .3 .5 .2 .3 .0 .3 .1 .2 .0 .0 .0 .9 .8 .7 .6 .7 .6 .6 .6 .5 .5 .5 .6 .0 .0 .0 .7 .0 5 5 4 4 4 15 12 4 4 4 4 4 4 4 3 3 3 3 3 3 3 3 3 3 3 4 11 8 5 14 26 82.2 .04 .04 .02 .02 .02 .18 .12 .02 .02 .02 .02 .02 .02 .02 .02 .02 .02 .02 .02 .02 .02 .02 .02 .02 .02 .02 .14 .08 .04 .22 .70 2.00 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) JUNE e2 2 22 10 4. 2 2 2 1 1 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 9 1 1 8 3 0 9 9 7 9 7 6 5 5 9 8 7 5 4 8 6 6 6 6 7 6 9 8 6 4 66 22 8 6 5 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 .04 .02 11 .60 .08 .04 .04 .02 .02 .02 .02 .02 .02 .02 .02 .44 .02 .02 .02 .02 .02 .02 .02 .02 .02 .02 .02 .02 .02 .02 86.4 12.70 e Estimated 224 RIO GRANDE DE LOIZA BASIN 50051180 QOEBRADA SALVATIERRA NEAR SAN LORENZO, PR-Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL YEAR 1. 6. 3. 2. 11 5. 7. 4. 2. 2. 2. 3. 2. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 2. 4. 2. 1. 1. 2. 88. 2894. 7 7 2 3 1 4 2 9 2 1 8 1 8 7 5 4 4 6 7 4 4 5 5 5 8 5 8 7 5 0 4 2 JULY 3 16 6 4 30 11 18 9 6 4 4 5 4 4 3 3 3 3 3 3 3 3 3 3 3 3 13 6 3 3 4 --- MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) AUGUST .02 .47 .06 .02 1.6 .16 .36 .10 .04 .02 .02 .06 .02 .02 .02 .02 .02 .02 .02 .02 . 02 . 02 .02 . 02 . 02 .02 .16 .04 .02 .02 .02 3.47 7325.50 1 1 1 4 3 1 1 1 1 1 5 5 5 5 3 3 11 7 21 11 8 3 5 9 3 2 6 2 5 5 2 155 .7 .5 .4 .7 .8 .6 .4 .3 .3 .3 .8 .4 .1 .0 .3 .2 .9 .8 .9 .2 .7 .6 .4 .4 .5 .5 .9 .6 .2 3 3 3 12 8 3 3 2 2 2 15 12 7 8 6 5 27 20 199 31 14 10 20 25 7 5 20 5 15 9 5 --- .02 .02 .02 .51 .08 .02 .02 .00 .00 .00 .68 .18 .10 .10 .06 .04 1.2 .60 35 1.6 .34 .10 .28 .92 .06 .04 .34 .04 .22 .14 .04 42.77 2. 2. 3. 2. 2. 1. 1. 1. 1. 12 11 9. 6. 22 7. 5. 11 320 21 15 24 73 156 58 18 14 13 22 17 13 -- 868. SEPTEMBER 7 9 5 4 0 9 7 6 7 6 0 2 7 - 9 5 6 6 5 4 3 3 3 3 32 29 16 14 63 10 7 29 159 7 40 73 58 711 198 50 38 32 82 47 40 --- —— .04 .04 .06 .04 .02 .02 .02 .02 .02 1.0 .86 .42 .31 7.5 .20 .10 1.0 200 .41 1.6 9.3 65 1230 70 2.4 1.4 1.1 19 2.6 1.4 1615.88 RIO GRANDE DE LOIZA BASIN 225 50051180 QDEBRADA SALVATIERRA NEAR SAN LORENZO, PR-Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CPS) (MG/L) (TONS/DAY) OCTOBER 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 44 15 9. 6. 8. 8. 8. 7. 8. 6. 7. 6. 5. 5. 4. 3. 3. 3. 3. 2. 2. 5. 3. 2. 2. 2. 2. 2. 2. 2. 2. 5 2 4 3 5 5 3 3 1 0 6 3 5 5 6 5 1 5 7 5 9 8 7 7 7 6 6 7 6 164 45 8 12 29 25 25 23 25 17 18 18 19 20 14 12 11 11 11 10 10 18 10 4 3 3 3 3 3 3 3 68 2.1 .23 .22 .67 .56 .56 .45 .63 .29 .33 .29 .31 .29 .17 .11 .10 .10 .09 .08 .07 .35 .12 .03 .02 .02 .02 .02 .02 .02 .02 2. 1. 1. 2. 3. 2. 3. 3. 3. 2. 2. 2. 3. 5. 4 . 3. 3. 2. 2. 2. 2. 2. 2. 2. 2 . 2. 2. e2. e2. e2. -- MEAN DISCHARGE (CPS) NOVEMBER 0 7 9 2 2 6 6 6 1 5 2 1 6 3 0 1 0 8 9 7 6 5 5 4 3 4 4 3 2 0 - 3 2 2 2 3 4 3 3 3 3 3 3 9 17 8 3 2 2 2 2 2 2 2 2 2 2 2 2 2 2 .__ .01 .00 .01 .02 .03 .02 .03 .03 .02 .02 .02 .02 .15 .26 .10 .02 .02 .02 .01 .02 .02 .02 .02 .02 .02 .02 .02 .02 .02 .01 ___ e2. el. el, el. el, 1, 1. 1, 1, 1. 1, 1, 1, 1, 1, 1, 1, 1, 1, .0 ,8 ,6 .6 .6 ,5 .5 .4 .4 .4 .4 .4 ,1 .1 .1 .1 .0 .0 .86 .89 .0 .96 .88 .84 .83 .83 .79 .79 ,87 .92 .93 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) DECEMBER 2 2 2 2 2 3 5 5 5 5 5 5 5 5 5 5 5 4 2 2 2 1 1 1 1 1 1 1 1 1 1 .02 .00 .00 .00 .00 .01 .02 .02 .02 .02 .02 .02 .02 .02 .02 .02 .02 .02 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 TOTAL 200.2 76.29 81.7 1.02 36.39 0.27 e Estimated 226 RIO GRANDE DE LOIZA BASIN 50051180 QDEBRADA SALVATIERRA NEAR SAN LORENZO, PR-Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 )AY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN DISCHARGE (CFS) .96 .80 1.0 .93 .85 .83 .83 .79 .75 .81 .72 .66 .80 .77 .81 .93 .93 .91 1.2 4.0 2.2 1.4 1.3 1.8 1.2 1.8 1.6 1.4 1.0 1.1 .99 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) JANUARY 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 11 5 2 2 2 2 3 4 4 4 4 4 .00 . 00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .18 .03 .00 . 00 .01 .00 . 01 .02 .02 .02 .01 .02 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) FEBRUARY 1. . • 1. 2. 2. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 97 6 94 93 93 3 1 3 9 5 2 0 83 8 90 83 84 84 75 86 2 6 6 8 1 0 93 91 5 5 5 4 5 6 6 6 6 5 4 4 4 3 3 3 3 3 3 14 7 6 5 5 4 3 3 3 .02 .02 .01 .02 .02 .02 .04 .04 .04 .02 .01 .01 .00 .01 .00 .00 .00 .00 .00 .03 .02 .02 .02 .02 .02 .01 .00 .00 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) MARCH 1 1 1 1 3 3 12 3 7 5 1 1 1 1 1 1 1 .4 .0 .80 .75 .75 .68 .58 .62 .2 .1 .83 .7 .2 .0 .9 .7 .9 .3 .2 .1 .0 .93 .91 .89 .96 .90 .89 .92 .0 .1 3 2 2 2 1 2 2 1 2 2 2 8 5 37 11 27 14 5 6 6 6 6 5 5 5 5 5 5 5 5 5 .01 .01 .00 .00 .00 .00 .00 .00 .00 .00 .00 .11 .05 1.7 .11 1.4 .28 .03 .03 .03 .02 .02 .02 .02 .02 .02 .02 .02 .02 .02 .02 TOTAL 36.07 0.32 34.46 0.42 60.21 3.98 RIO GRANDE DE LOIZA BASIN 227 50051180 QOEBRADA SALVATIERRA NEAR SAN LORENZO, PR-Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN DISCHARGE DAY (CFS) MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) APRIL 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 .83 .83 .75 .75 .73 .69 .67 .72 .70 .67 .60 .67 3.0 1.4 .95 1.2 .83 .75 5.1 6.0 1.6 1.0 .91 .85 7.6 4.9 1.7 1.2 .93 .84 ___ 5 4 4 4 3 3 3 2 2 2 2 2 10 5 4 4 3 3 102 19 6 4 4 4 25 13 7 6 6 6 ___ .02 .01 .00 .01 .00 .00 .00 .00 .00 .00 .00 .00 . 11 .02 .01 .01 .01 .01 2.3 .39 .03 .02 .01 .01 1.3 .22 .03 .02 .02 .02 ___ MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) MAY 5 14 11 1 1 1 .67 .72 .73 .61 .65 .48 .43 .42 .2 .7 . 90 .7 .76 .52 .46 .44 .42 .44 .41 .39 .40 .40 .38 . 1 .58 .42 .34 .31 .50 5 5 5 5 5 5 5 5 18 72 45 5 2 10 4 4 4 4 4 4 2 2 .01 .01 .01 .00 .00 .00 .00 .00 2.2 3.9 2.2 .02 .00 .05 .01 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .01 .00 .00 .00 .00 .00 7 6 4 1 1 1 46 31 23 9 3 1 1 1 1 8 5 1 1 JUNE .48 .59 .52 .59 .0 .4 .2 .4 .7 .7 .99 .93 .85 .1 .8 .8 .9 .0 .79 .60 .2 .1 .4 .6 .0 .73 .60 ___ 2 2 2 2 22 20 16 4 5 8 6 5 4 180 76 77 21 6 5 5 4 4 4 5 26 17 7 5 5 5 ___ .00 .00 .00 .00 .80 .43 .21 .01 .02 .04 .02 .01 .01 91 7.0 5.9 .58 .07 .02 .02 .01 .01 .00 .01 .74 .27 .03 .02 .01 .00 __. TOTAL 49.37 4.58 47.48 8.42 107.24 228 RIO GRANDE DE LOIZA BASIN 50051180 QOEBRADA SALVATIERRA NEAR SAN LORENZO, PR-Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) AUGUST MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL YEAR 10 7 6 1 1 1 1 3 1 7 6 13 4 1 1 6 21 14 7 3 1 1 130 1162 .87 .90 .58 .78 .78 .3 .4 .7 .3 .1 .2 .72 .67 .6 .5 .5 .4 .8 .7 .1 .86 .7 .7 .0 .7 .1 .86 .82 .60 JULY 5 5 5 6 6 33 23 29 23 19 13 11 7 5 18 20 27 21 41 20 13 12 10 26 75 45 21 13 11 10 9 -__ .01 .01 .00 .01 .01 1.5 .46 .51 .12 .07 .04 .04 .01 .00 .33 .09 .88 .45 1.6 .26 .06 .03 .02 1.5 5.3 1.8 .51 .11 .06 .03 .02 15.84 381.14 MEAN DISCHARGE (CFS) 3. 3. 15 11 3. 1. 31 15 61 30 13 29 15 7. 3. 2. 1. 1. 1. 2. 3. 1. 2. 1. 264. ,70 ,7 ,7 ,6 ,9 ,3 ,7 .3 5 5 , 1 2 0 3 1 ,3 ,74 56 ,53 56 , 89 ,43 61 3. 3. 15 11 3. 1. 31 15 61 30 13 29 15 7. 3. 2. 1. 1. 1. 2. 3. 1. 2. 1. ,70 ,7 ,7 ,6 ,9 ,3 ,7 .3 5 5 , 1 ,2 0 3 1 ,3 ,74 56 ,53 56 , 89 ,43 7 14 12 56 36 19 13 127 48 260 100 40 121 49 22 12 8 6 6 6 8 10 6 6 5 3 3 3 3 4 3 .01 .30 .17 5.5 1.4 .19 .07 21 2.0 89 8.8 1.5 23 2.3 .45 .13 .06 .03 .03 .01 .12 .13 .02 .03 .02 .00 .00 .00 .00 .01 .00 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) SEPTEMBER 2 1 1 5 1 1 1 1 10 10 6 4 1 .37 .34 .40 .2 .51 .49 .6 .6 .56 .49 .32 .29 .48 .55 .52 .0 .5 .4 .3 .65 .51 .61 .3 .89 .4 .1 .2 .74 3 3 3 6 4 4 5 6 4 4 4 4 4 4 2 15 14 7 4 2 2 3 5 4 36 35 20 13 5 3 .00 .00 .00 .06 .00 .00 .05 .05 .00 .00 .00 .00 .00 .00 .00 .33 .06 .02 .02 .00 .00 .00 .02 .00 3.5 1.7 .46 .19 .02 .00 156.28 56.32 6.48 RIO GRANDB DB LOIZA BASIN 50051180 QDEBRADA SALVATIBRRA NEAR SAN LORENZO, PR--Continued WATER QUALITY DATA, WATER YEAR AUGUST 1989 TO SEPTEMBER 1990 PARTICLE-SIZE DISTRIBUTION OP SUSPENDED SEDIMENT 229 DATE AUG 1989 19. .. SEP 18... 19. .. 22. . . APR 1990 19. .. 19. .. DATE AUG 1989 19. .. SEP 18. .. 19. .. 22. .. APR 1990 19. .. 19. .. TIME 0050 0439 0947 0932 1127 1200 SBD. SUSP. PALL DIAM. PERCENT FINER THAN .016 MM 29 60 60 -- 83 64 DIS- CHARGE, INST. CUBIC PBET PER SECOND 80 103 1110 113 5.1 5.9 SED. SUSP. PALL DIAM. PERCENT FINER THAN .031 MM 47 72 70 -- 96 86 SEDI- MENT, SUS- PENDED (MG/L) 5580 2520 1680 666 10700 25200 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .062 MM 60 84 73 77 100 96 SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) 1205 701 5035 203 147 401 SBD. SUSP. SIEVE DIAM. PERCENT FINER THAN .125 MM 93 94 86 84 100 99 SBD. SUSP. PALL DIAM. PERCENT FINER THAN .002 MM 10 32 24 58 19 11 SBD. SUSP. SIEVE DIAM. PERCENT FINER THAN .250 MM 99 97 94 90 100 100 SBD. SUSP. PALL DIAM. PERCENT FINER THAN .004 MM 14 34 30 -- 34 22 SBD. SUSP. SIEVE DIAM. PERCENT FINER THAN .500 MM 99 98 98 96 100 100 SED. SUSP. FALL DIAM. PERCENT FINER THAN .008 MM 18 43 41 -- 56 39 SBD. SUSP. SIEVE DIAM. PERCENT FINER THAN 1.00 MM 100 100 100 100 100 100 230 RIO GRANDK DE LOIZA BASIN 50051310 RIO CAYAGOAS AT CKRRO GORDO, PR LOCATION.--Lat 18°09'13", long 65°57'20", Hydrologic Unit 21010005, at downstream side on bridge on Highway 912, at Barrio Cerro Gordo, 2.8 mi (4.5 km) south of San Lorenzo. DRAINAGE AREA.--10.2 mi 3 (26.4 km'). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--October 1977 to current year. GAGE.—Water-stage recorder and crest-stage gage. Elevation of gage is 490 ft (150 m), from topographic map. Prior to Oct. 1, 1983, at site 2,000 ft (610 m) downstream at different datum. REMARKS.--Records poor. Sand removal at a commercial level is practiced at times during the year. This takes place about one hundred feet downstream from the low water control. Gage-height and precipitation satellite telemetry at station. AVERAGE DISCHARGE.--13 years (1978-90), 46.4 ftVs (1.314 mVs), 61.78 in/yr (1,569 mm/yr), 33,620 acre-ft/yr (41.45 hm'/yr); median of yearly mean discharges, 40.0 ftVs (1.13 mj/s), 29,000 acre-ft/yr (35.8 hmVyr) . EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 13,200 ftj/s (374 m3/s) , Aug. 31, 1979, gage height, 9.44 ft (2.877 m) , site and datum then in use, from rating curve extended above 1,000 ftVs (28.3 mVs) on basis of slope-area measurement; minimum discharge, 7.1 ftVs (0.201 m3/s), Feb. 4, May 3, 1981, Apr. 12, 13, 16, 17, 1983. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 2,500 ftVs (70.8 mVs) and maximum (*): Time Discharge (ftVs) (mVs) Gage height (ft) (m) Date Discharge (ftVs) (mVs) Date Time Aug. 10 0830 *528 15.0 *8.24 2.512 Minimum discharge, 8.3 ft'/s (0.235 m3 /s). May 16. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES Gage height (ft) (m) DAY NOV DEC JAN AUG SEP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC -FT CFSM IN. CAL YR WTR YR 54 51 49 47 43 40 37 35 39 31 30 29 29 28 29 e30 e26 e24 e22 e23 e26 e58 e34 e30 e31 e33 e30 e29 e30 e43 e28 1068 34.5 58 22 2120 3.38 3.90 1989 1990 e26 e26 e25 e23 e34 e26 e25 e29 e30 e27 e25 e22 e21 21 20 20 20 20 21 21 20 18 18 18 18 18 17 17 17 17 --- 660 22.0 34 17 1310 2.16 2.41 TOTAL 11326 TOTAL 6804.5 17 17 16 16 16 16 16 15 15 15 15 15 14 15 15 14 14 14 14 15 14 13 14 14 15 13 12 12 14 14 12 451 14.5 17 12 895 1.43 1.64 MEAN 31. MEAN 18. 13 15 14 13 12 12 12 12 12 12 13 12 12 12 12 11 12 12 14 20 16 15 14 16 17 27 20 21 18 16 16 453 14.6 27 11 899 1.43 1.65 ,0 MAX ,6 MAX 15 17 15 15 14 14 14 16 15 15 14 14 14 15 14 14 14 16 15 16 18 17 17 30 16 16 15 14 ___ ___ --- 439 15.7 30 14 871 1.54 1. 60 585 MIN 127 MIN 14 14 13 13 13 13 13 13 13 13 14 14 15 19 17 16 16 15 14 15 15 14 14 14 14 14 14 15 15 15 15 446 14.4 19 13 885 1.41 1.63 11 AC -FT 8.6 AC-FT 14 14 15 14 14 14 14 14 14 13 13 14 17 14 14 13 13 13 13 12 12 12 11 11 21 18 13 11 11 11 --- 407 13.6 21 11 807 1.33 1.48 22470 13500 11 10 9.4 9.2 9.1 8.9 8.8 8.7 10 16 13 9.4 8.7 9.4 8.8 8.9 9.4 9.7 9.3 9.3 9.3 9.1 9.0 8.8 8.6 12 9.6 9.3 9.2 8.9 9.4 300.2 9.68 16 8.6 595 .95 1.09 CFSM 3 . 04 CFSM 1.83 9.2 9.9 9.2 9.7 13 14 12 10 9.5 9.3 9.3 9.1 9.1 54 52 21 17 15 14 18 14 13 12 14 42 23 17 16 15 15--- 505.3 16.8 54 9.1 1000 1.65 1.84 IN. 41. IN. 24. 17 16 14 15 15 23 18 16 15 15 15 14 14 14 15 14 14 16 19 15 14 13 13 14 27 27 18 15 14 14 14 497 16.0 27 13 986 1.57 1.81 .31 ,82 13 14 14 14 14 14 19 27 17 127 36 28 28 25 24 23 22 22 22 22 21 22 22 22 22 22 21 94 42 25 22 860 27.7 127 13 1710 2.72 3.14 22 21 22 26 21 21 21 21 21 23 21 21 30 35 32 40 31 28 29 23 21 20 20 23 19 20 18 28 21 19 718 23.9 40 18 1420 2.35 2.62 e Estimated RIO GRANDE DE LOIZA BASIN 231 50051310 RIO CAYAGUAS AT CERRO GORDO, PR--Continued WATER QUALITY RECORDS PERIOD OP RECORD.--WATER YEARS AUGUST 1981 TO CURRENT YEAR SPECIFIC CON- TEMPERA- DUCTANCE TURE (DHHOS) (DBG C) DATE TIME OCT. 10 1043 NOV. 13 1210 DEC. 14 0954 JAN. 18 0917 FEB. 06 1513 MAR. 15 1347 STREAMFLOW, INSTANTANEOUS (CFS) 30.4 21.0 14.7 11.6 14.2 15.2 130 127 126 131 131 25.5 26.5 21.5 21.5 26.0 26.0 DATE TIME APR. 13 1237 MAY 16 1139 JUNE 22 0956 JULY 18 1015 AUG. 13 1340 SEPT 13 1447 STREAMFLOW, INSTANTANEOUS (CFS) 16.8 3.98 12.5 15.7 32.0 30.8 SPECIFIC CON- TEMPERA- DUCTANCE TURE (UMHOS) (DBG C) 131 140 140 140 137 133 27.5 29.0 26.5 25.5 26.5 28.0 232 RIO GRANDE DE LOIZA BASIN 50053025 RIO TURABO ABOVE BORINQUEN, PR LOCATION.--Lat 18°09'35", long 66°02'26", Hydrologic Unit 21010005, on left bank at Highway 765, 1.2 mi (1.9 km) south of Villa Borinquen, 8.1 mi (13.0 km) upstream from Rio Grande de Loiza. DRAINAGE AREA.--7.14 mi J (18.49 km'). WATER-DISCHARGE RECORDS PERIOD OP RECORD.--January to September 1990. GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 492 ft (150 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. Gage-height and precipitation satellite telemetry at station. EXTREMES FOR CURRENT PERIOD.--Peak discharges greater than base discharge of 1,200 ft3 /s (34.0 m3/s) and maximum (*) Discharge Time (ft3/s) (m'/s) Gage height (ft) (m) Date Sept. 30 1615 *985 27.9 *10.75 3.277 Minimum discharge, 3.9 ft3 /s (1.189 m'/s). May 22,23. Discharge Gage height Time (ftVs) (m3/B) (ft) (m) DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC-FT CPSM IN. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES NOV DEC JAN PBB MAY JUN SEP e7.6 e7.4 e6.4 e6.0 e6.2 e6.4 e6.6 e6.2 e6.4 e7.4 e6.8 e6.2 e6.0 e5.8 e5.6 e5.6 e5.4 e6.0 6.8 14 7.4 6.1 5.9 6.6 7.5 26 12 13 9.0 7.8 7.4 243.5 7.85 26 5.4 483 1.10 1.27 6.9 7.7 6.8 6.3 6.2 6.1 6.3 8.3 9.4 8.3 6.8 6.4 6.0 11 7.7 6.9 6.7 7.6 6.7 7.9 12 11 12 35 10 8.5 7.7 7.8 ___ ___ --- 250.0 8.93 35 6.0 496 1.25 1.30 8.2 7.6 6.8 6.7 6.5 6.3 6.2 6.2 8.4 8.3 10 22 34 80 15 16 12 8.8 7.4 6.9 6.7 6.3 6.3 6.2 6. 1 6.1 6.0 6.2 6.0 6.5 6.1 351.8 11.3 80 6.0 698 1.59 1.83 5.6 5.4 5.3 5.2 5.1 5.1 4.9 5.0 4.9 5.1 4.9 5.1 8.9 6.4 5.5 5.2 5.1 5.1 7.0 6.6 5.3 5.2 5.3 4.9 11 16 8.9 6.3 5.6 5.4 --- 185.3 6.18 16 4.9 368 .87 .97 5.4 5.3 5.2 5.4 5.5 5.3 5.2 5.3 81 39 13 7.3 5.9 8.9 6.2 5.4 5.2 5.0 4.9 4.8 4.7 4.4 4.1 4.1 4.1 4.9 4.9 4.6 4.6 4.4 4.6 278.6 8.99 81 4.1 553 1.26 1.45 4.9 5.4 4.9 5.8 6.2 6.3 8.0 6.0 11 6.9 6.6 6.6 6.3 162 92 17 11 8.3 7.8 10 7.9 6.8 7.1 10 99 37 14 10 8.3 8.1 --- 601.2 20.0 162 4.9 1190 2.81 3.13 15 9.8 8.7 14 9.1 15 12 9.9 8.6 8.9 7.9 8.1 8.3 9.2 20 12 20 24 50 15 11 11 12 13 101 92 19 12 9.4 8.1 7.2 581.2 18.7 101 7.2 1150 2.63 3.03 6.9 8.2 7.5 8.7 11 7.7 11 30 13 178 30 15 13 11 9.7 8.7 8.1 8.2 9.0 8.1 14 18 12 11 9.2 8.4 7.4 96 67 19 12 676.8 21.8 178 6.9 1340 3.06 3.53 14 11 9.8 13 9.0 8.4 11 9.8 8.8 8.2 7.9 8.4 9.0 9.8 9.2 13 11 23 12 9.1 8.9 8.7 10 9.8 26 14 9.7 9.1 8.4 104 --- 424.0 14.1 104 7.9 841 1.98 2.21 e Estimated RIO GRANDE DB LOIZA BASIN 233 50053025 RIO TURABO ABOVE BORINQUBN, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.-- OCTOBER 1989 TO SEPTEMBER 1990 SPECIFIC CON- TEMPERA- DDCTANCE TORE (DMHOS) (DEC C) DATE TIME MAR. 13 1733 APR. 18 1204 MAY 22 1419 JUNE 13 1118 STREAMFLOW, INSTANTANEOUS (CFS) 32.5 5.61 4.44 7.04 150 171 170 176 23.0 26.0 29.5 26.5 DATE TIME JULY 12 1337 AUG. 09 1120 SEPT 10 1250 STREAMFLOW, INSTANTANEOUS (CFS) 8.06 12.2 9.03 SPECIFIC CON- DUCTANCE (DMHOS) 160 157 169 TEMPERA- TURE (DEC C) 28.5 26.0 28.5 234 RIO GRANDK DE LOIZA BASIN 50053050 RIO TURABO AT BORINQUEN, PR LOCATION.--Lat 18°10'10", long 66°02'37", Hydrologic Unit 21010005, at right upstream end of bridge on Highway 765, 0.5 mi (0.8 km) south of Villa Borinquen, and 7.3 mi (11.7 km) upstream from Rio Grande de Loiza. DRAINAGE AREA.--7.89 mi' (20.44 km1 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.—December 1983 to April 1990 (discontinued). GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 430 ft (131 m), from topographic map. REMARKS.--Records fair. AVERAGE DISCHARGE.--5 years (1985-89), 28 ft'/s (0.793 m3 /s) , 48.19 in/yr (1,224 mm/yr), 20,290 acre-ft/yr (25.0 hm'/yr) . EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 13,800 ft'/s (391 m'/s), Nov.27, 1987, gage height, 18.02 ft (5.492 m) , from floodmark, from rating curve extended above 200 ft'/s (5.66 m'/s) on basis of step-backwater analysis and slope-area measurement; minimum discharge, 1.4 ft3/s (0.040 m}/s), Oct. 11, 1987. EXTREMES FOR CURRENT PERIOD.--Peak discharges greater than base discharge of 1,500 ft'/s (42.5 mVs) and maximum (*): Discharge (ftVs) (m'/s) Gage height (ft) (m) Date Time Oct. 1 1615 *578 16.4 *6.21 1.893 Minimum discharge, 4.7 ft'/s (0.133 m3/s) , Apr. 15. Date Time Discharge (ft'/s) (mVs) Gage height (ft) (m) DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES DAY JAN APR JUN SEP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC -FT CFSM IN. 98 39 25 28 22 21 21 20 23 19 18 18 17 17 17 16 16 17 16 16 15 18 13 12 12 12 12 11 11 15 12 627 20.2 98 11 1240 2.56 2.96 12 12 11 11 22 14 16 14 14 13 11 11 15 14 12 11 11 10 9.8 10 9.8 9.4 9.2 9.1 9.2 9.4 9.0 8.7 8.1 8.1 --- 343.8 11.5 22 8.1 682 1.45 1.62 7.8 7.7 7.8 7.6 7.5 7.7 7.5 7.5 7.0 6.9 7.0 7.2 7.0 6.9 6.8 6.5 6.5 6.9 7.1 7.0 6.9 6.9 7.6 6.7 6.7 6.7 6.8 6.8 7.6 7 .4 7 .7 221.7 7.15 7 .8 6.5 440 .91 1.05 8.3 8.8 8.4 7.3 6.9 7.2 7.4 7.6 7.0 7.5 8.7 7.9 7.3 6.8 6.7 6.5 6.5 6.3 7.9 16 8.2 6.8 6.9 7. 6 8.7 28 14 14 10 9.1 8.7 279.0 9.00 28 6.3 553 1.14 1.32 8.0 8.9 7.8 7.2 7.0 6.5 7.0 8.8 10 9.1 7.7 7.1 6.8 12 8.7 8.1 8.0 8.7 7.9 8.9 13 12 12 33 11 9.5 8.7 8.9 ___ ___ --- 272.3 9.72 33 6.5 540 1.23 1.28 8.8 8.3 7.4 7.3 6.9 7.0 6.9 6.6 9.0 8.4 11 23 32 72 18 21 15 11 9.6 9.3 8.7 9.0 8.9 8.2 8.4 8.2 8.4 8.4 8.0 8.5 8.2 391.4 12.6 72 6.6 776 1.60 1.85 7.4 7.4 7.2 6.9 7.4 7.6 7.3 7.7 7.7 7.4 7.0 7.4 12 7.9 6.9 6.3 ___ __- .-_ --- ___ ___ ___ ___ --- ___ ___ ___ ___ ___ --- ._- ___ ___ ___ ___ ___ CAL YR 1989 TOTAL 7034.1 MEAN 19.3 MAX 395 MIN 5.7 AC-FT 13950 CFSM 2.44 IN. 33.16 RIO GRANDE DE LOIZA BASIN 235 50055000 RIO GRANDE DE LOIZA AT CAGUAS, PR LOGATION.--Lat 18°14'33", long 66°00'34", Hydrologic Unit 21010005, on right bank 250 ft (76 m) upstream from bridge on Highway 189, 1.2 mi (1.9 km) downstream from Rio Turabo, and 1.8 mi (2.9 km) east of Plaza de Caguas. DRAINAGE AREA.--89.8 mi» (232.6 km a ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--1959 (low-flow measurement only), February to November 1959 (monthly measurements only). December 1959 to current year. GAGE.--Water-stage recorder. Datum of gage is 143.28 ft (43.672 m) above mean sea level. REMARKS.--Records fair. Gage-height and precipitation satellite telemetry at station. AVERAGE DISCHARGES.--30 years (1961-90), 222 ftVs (6.287 m3 /s), 33.57 in/yr (853 mm/yr), 160,800 acre-ft/yr (198 hmVyr); median of yearly mean discharges, 215 ftVs (6.09 m3/s), 156,000 acre-ft/yr (192 hmVyr) • EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 71,500 ft3/s (2,020 m3/s), Sept. 6, 1960, gage height, 31.17 ft (9.501 m), from rating curve extended above 6,000 ft3/s (170 m3/s) on basis of slope-area measurement; minimum daily discharge, 10 ft3 /s (0.283 m3 /s), Apr. 5, 10, 29, 1968. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 8,000 ft j /s (227 m3 /s) and maximum (*): Discharge (ft3/s) (m'/s) Gage height (ft) (m) Date Time Aug. 10 1045 *4,470 127 *10.69 3.258 Minimum discharge, 13 ft3/s (0.368 m3/s). May 31. Discharge Time (ftVs) (mVs) Gage height (ft) (m) DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES DAY OCT NOV DEC PEB APR JUL AUG SEP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC-FT CPSM IN. CAL YR WTR YR 560 319 235 246 240 211 187 182 257 168 157 151 142 143 145 132 116 103 91 91 96 167 150 120 115 111 109 100 99 128 117 5188 167 560 91 10290 1.86 2.15 1989 1990 103 95 90 85 146 115 96 110 100 98 83 79 80 85 77 74 72 72 74 72 72 68 67 70 67 68 64 58 56 56 --- 2452 81.7 146 56 4860 .91 1.02 TOTAL 70628 TOTAL 33245 54 55 56 53 51 53 56 54 52 53 49 49 49 45 45 49 43 44 49 56 51 44 43 47 46 43 38 36 42 58 45 1508 48.6 58 36 2990 .54 .62 MEAN 194 MEAN 91 54 71 80 60 50 45 48 46 46 45 53 51 47 49 45 44 44 42 48 97 118 61 59 57 57 133 131 121 93 76 61 2032 65.5 133 42 4030 .73 .84 MAX . 1 MAX 57 68 56 52 43 41 50 67 95 83 58 50 48 65 69 52 52 60 61 54 82 112 96 272 103 79 68 59 ___ ___ --- 2052 73.3 272 41 4070 .82 .85 7080 MIN 1100 MIN 61 60 48 48 43 42 40 37 73 77 67 123 139 332 147 148 149 86 63 59 56 50 53 55 51 48 48 49 50 46 50 2398 77.4 332 37 4760 .86 .99 36 AC-FT 19 AC-FT 39 39 37 37 37 34 30 29 31 30 27 27 50 66 36 31 30 29 85 104 41 30 27 22 38 132 71 41 32 27 --- 1289 43.0 132 22 2560 .48 .53 140100 65940 26 26 27 25 23 22 19 19 87 613 220 75 51 60 54 39 34 32 30 26 26 23 24 21 20 27 35 25 23 19 19 1770 57.1 613 19 3510 .64 .73 CPSM 2.15 CPSM 1.01 21 22 24 21 33 79 53 37 36 42 26 23 19 723 804 235 125 86 68 96 77 55 74 79 366 200 111 77 62 54 --- 3728 124 804 19 7390 1.38 1.54 IN. IN. 70 75 52 56 58 193 133 90 61 57 53 48 43 66 121 103 80 113 210 108 67 52 47 98 344 348 175 96 72 60 52 3201 103 348 43 6350 1.15 1.33 29.26 13.77 48 79 85 123 119 74 64 363 163 1100 365 170 229 174 105 85 74 71 70 64 57 67 81 73 67 68 51 432 307 121 66 5015 162 1100 48 9950 1.80 2.08 55 55 69 76 54 44 42 51 47 47 38 38 65 93 129 122 123 91 146 75 59 54 108 106 74 147 159 120 188 137 --- 2612 87.1 188 38 5180 .97 1.08 nog * ° RIO GRANDE DE LOIZA BASIN 50055000 RIO GRANDE DE LOIZA AT CAGUAS, PR—Continued WATER-QUALITY RECORDS PERIOD OF RECORD.--Water years 1959 to current year. PERIOD OF DAILY RECORD.-- SUSPENDED-SEDIMENT DISCHARGE: October 1983 to September 1989. INSTRUMENTATION.-- USD-49 and automatic sediment sampler. EXTREMES FOR PERIOD OF DAILY RECORD.-- SEDIMENT CONCENTRATION: Maximum daily mean,14,500 mg/L Nov 27, 1987; Minimum daily mean, 11 mg/L August 12, 1985. SEDIMENT LOADS: Maximum daily mean, 227,000 tons (205,890 tonnes) Nov 27, 1987; Minimum daily mean, 1.3 tons (1.2) July 14, 1985. EXTREMES FOR CURRENT YEAR.-- SEDIMENT CONCENTRATION: Maximum daily mean, 691 mg/L October 23,1989 ; minimum daily mean, 12 mg/L October 27, 1989. SEDIMENT LOADS: Maximum daily mean, 2,830 tons (2,580 tonnes) August 10, 1990 ; minimum daily 1.4 ton (1.3 tonnes) May 25, 1990. REVISIONS.-- MEAN CONCENTRATION (mg/L): On May 13, 1986 is 1,550. SEDIMENT DISCHARGE (tons/day): On May 13, 1986 is 36,300. WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 12. .. DEC 07. .. FEB 1990 07. .. APR 11. . . JUN 05. . . AUG 14. .. DATE OCT 1989 12. .. DEC 07. .. FEB 1990 07. .. APR 11. .. JUN 05. .. AUG 14. .. TIME 0840 0845 0855 0925 0845 0900 HARD- NESS TOTAL (MG/L AS CACO3 ) 74 -- -- 88 -- 58 DIS- CHARGE, INST. CUBIC FEET PER SECOND 148 58 45 30 38 179 HARD- NESS NONCARB WH WAT TOT FLD MG/L AS CACO3 0 -- -- 0 -- 0 SPE- CIFIC CON- DUCT- ANCE (US/CM) 247 270 276 303 301 200 CALCIUM DIS- SOLVED (MG/L AS CA) 18 -- -- 22 -- 14 PH (STAND- ARD UNITS) 7.40 7.40 7.20 7.40 7.00 7.60 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 7.0 -- -- 8.1 -- 5.5 TEMPER- ATURE WATER (DEG C) 26.0 24.0 23.0 24.5 27.5 25.0 SODIUM, DIS- SOLVED (MG/L AS NA) 20 -- -- 27 -- 15 TUR- BID- ITY (NTU) 50 44 55 45 15 280 SODIUM AD- SORP- TION RATIO 1 _- -- 1 -- 0.9 OXYGEN, DIS- SOLVED (MG/L) 7.1 5.3 6.9 6.8 7.2 6.9 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 2.1 -- -- 1.7 -- 2.4 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 87 62 80 81 90 83 ALKA- LINITY WAT WH TOT FET FIELD MG/L AS CACO3 80 86 86 94 90 62 OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 23 25 18 27 19 50 SULFIDE TOTAL (MG/L AS S) <0.5 -- -- <0.5 -- -- COLI- FORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) K79000 23000 4900 4600 K820 560000 SULFATE DIS- SOLVED (MG/L AS SO4) 13 -- -- 24 -- 12 STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) K2000 K1700 380 K200 500 33000 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 17 -- -- 26 -- 20 K = non-ideal count RIO GRANDE DE LOIZA BASIN 50055000 RIO GRANDE DE LOIZA AT CAGUAS, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 237 SOLIDS, RESIDUE PLUG- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- DATE OCT 1989 12. .. DEC 07.. . FEB 1990 07. .. APR 11.. . JUN 05.. . AUG 14.. . DATE OCT 1989 12.. . DEC 07. .. FEB 1990 07.. . APR 11. .. JUN 05. .. AUG 14. .. DATE OCT 1989 12.. . DEC 07. .. FEB 1990 07. .. APR 11. .. JUN 05. .. AUG 14. .. RIDE, DIS- SOLVED (MG/L AS F) 0.10 -- -- <0.10 -- <0.10 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.30 0.60 0.50 0.60 0.30 1.1 IRON, TOTAL RECOV- ERABLE (UG/L AS FE) 4200 -- -- 740 -- -- DIS- SOLVED (MG/L AS SI02) 31 -- -- 32 -- 24 NITRO- GEN, TOTAL (MG/L AS N) 0.60 1.3 1.1 1.5 1.1 1.6 LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) 2 -- -- 3 -- -- CONSTI- TUENTS, DIS- SOLVED (MG/L) 156 -- -- 195 -- 130 NITRO- GEN, TOTAL (MG/L AS NO3) 2.7 5.8 4.9 6.6 4.9 7.1 MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) 330 _- -- 330 -- -- DIS- SOLVED (TONS PER DAY) 62.4 -- -- 15.7 -- 70.0 PHOS- PHORUS TOTAL (MG/L AS P) 0.16 0.28 0.22 0.32 0.34 0.28 MERCURY TOTAL RECOV- ERABLE (UG/L AS HG) <0.10 -- -- <0.10 -- -- AT 105 DEG. C, SUS- PENDED (MG/L) 77 58 70 62 22 500 ARSENIC TOTAL (UG/L AS AS) <1 -- -- <1 -- " SELE- NIUM, TOTAL (UG/L AS SE) <1 -- -- <1 -- -- GEN, NITRATE TOTAL (MG/L AS N) 0.26 0.62 0.46 0.79 0.73 0.33 BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 -- -- <100 -- - - SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) <1 -- -- 1 -- -- GEN, NITRITE TOTAL (MG/L AS N) 0.04 0.08 0.14 0.11 0.07 0.17 BORON, TOTAL RECOV- ERABLE (UG/L AS B) 10 -- -- 100 -- - - ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) 20 -- -- 20 -- -- GEN, N02+N03 TOTAL (MG/L AS N) 0.30 0.70 0.60 0.90 0.80 0.50 CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- 1 — "" CYANIDE TOTAL (MG/L AS CN) <0.010 -- -- <0.010 -- -- GEN, AMMONIA TOTAL (MG/L AS N) 0.07 0.14 0.19 0.25 0.10 0.25 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) <1 -- -- 4 -- - - PHENOLS TOTAL (UG/L) <1 -- -- 18 -- -- GEN, ORGANIC TOTAL (MG/L AS N) 0.23 0.46 0.31 0.35 0.20 0.85 COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) <10 -- -- 20 -- - - METHY- LENE BLUE ACTIVE SUB- STANCE (MG/L) 0.02 -- -- 0.20 -- -- 238 RIO GRANDB DB LOIZA BASIN 50055000 RIO GRANDB DB LOIZA AT CAGOAS, PR—Continued SEDIMENT DISCHARGE, SUSPENDED {TONS/DAY), WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN MEAN CONCBN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) NOVEMBER MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) OCTOBER 1 2 3 4 5 6 1 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 560 319 235 246 240 211 185 186 252 167 157 150 141 142 138 135 116 103 91 91 96 167 150 123 119 114 112 103 101 131 120 349 148 40 82 192 167 156 152 305 230 141 55 26 24 21 20 19 20 119 20 20 317 691 408 139 16 12 16 16 102 108 856 136 26 73 129 96 81 81 221 107 62 23 9. 9. 8, 7. 5, 5, 29 4, 5, 276 296 127 43 4, 3, 4, 4, 38 37 .8 .3 .4 .0 .8 .4 .8 .2 .8 .5 .2 .1 106 97 92 87 149 118 98 112 102 100 85 81 83 87 79 76 74 74 76 74 74 70 69 72 68 70 66 60 57 58 90 90 88 84 128 106 79 63 61 60 53 43 39 36 35 42 48 55 64 69 68 58 42 34 29 33 35 39 41 50 24 23 21 19 52 34 21 20 16 16 12 9. 8. 8. 7. 8. 9. 10 13 14 14 11 7. 6. 5. 6. 6. 6. 5. 7. 0 5 8 6 ,4 ,7 ,6 ,8 ,2 .1 .1 ,5 .9 ,6 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) DECEMBER 55 57 58 54 53 54 58 55 54 55 51 50 50 47 47 51 45 45 49 54 49 43 42 45 44 41 36 35 40 56 43 58 57 51 48 46 43 136 55 40 40 40 40 37 99 30 30 29 28 27 27 26 25 25 27 26 25 23 21 20 24 26 8 8 8 6 6 6 21 7 5 6 5 5 5 12 3 4 3 3 3 3 3 3 3 3 3 3 2 2 2 3 3 .9 .8 .1 .6 .1 .0 .7 .8 .3 .2 .6 .0 .8 .1 .5 .4 .6 .9 .6 .0 .0 .3 .2 .0 .3 .0 .1 .4 .1 5201 2809.3 2514 423.8 1516 167.4 RIO GRANDE DE LOIZA BASIN 50055000 RIO GRANDE DE LOIZA AT CAGUAS, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 239 DAY 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN DISCHARGE (CFS) MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) JANUARY 52 69 78 58 48 43 46 45 45 43 52 49 45 47 43 43 43 41 46 95 115 59 57 55 56 130 128 118 91 74 60 30 31 33 35 36 32 30 36 111 21 24 25 27 29 30 33 35 35 38 86 107 54 48 49 52 109 118 100 68 40 40 4 5 6 5 4 3 3 4 15 2 3 3 3 3 3 3 4 3 4 31 40 8 7 7 8 49 45 32 19 7 6 .2 .8 .6 .6 .4 .7 .8 .4 .4 .2 .3 .2 .6 .6 .9 .0 .6 .4 .8 .7 .4 .2 .9 .6 MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) FEBRUARY 55 66 55 50 42 40 48 65 93 81 56 49 46 63 67 50 51 58 60 52 80 110 93 269 100 77 66 57 ___ ___ --- 45 106 140 140 130 83 216 103 90 74 63 52 42 42 43 42 43 42 41 43 45 45 45 199 92 52 41 103 ___ ___ ___ 6. 20 22 19 15 9. 28 18 24 17 9. 6. 5. 7. 7. 5. 5. 6. 6. 6. 9. 13 11 189 28 11 7. 16 -- -- -- 7 5 9 9 0 2 4 6 8 6 9 2 8 3 - - - MARCH 59 58 46 47 41 41 38 36 71 75 65 121 136 328 144 145 145 83 61 57 54 47 48 51 47 44 45 48 50 47 51 100 91 80 69 57 50 44 35 73 83 74 116 124 239 130 129 129 97 93 92 97 98 93 82 74 67 68 74 79 74 70 15 14 10 8 6 5 4 3 18 18 13 40 48 243 56 61 56 22 16 14 14 13 12 12 9 8 7 9 10 9 9 .2 .4 .4 .4 .4 .8 .2 .9 .3 .3 .3 TOTAL 1974 351.3 1999 531.8 2329 786.6 240 RIO GRANDE DE LOIZA BASIN IAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN DISCHARGE (CFS) 40 40 38 38 38 35 31 29 32 30 29 30 53 69 38 32 30 31 85 104 41 30 27 24 41 136 73 41 31 25 ___ 50055000 RIO GRANDE DE LOIZA AT CAGUAS, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) APRIL 40 40 38 38 38 35 31 29 32 30 29 30 53 69 38 32 30 31 85 104 41 30 27 24 41 136 73 41 31 25 59 49 45 44 42 37 35 35 95 59 34 36 59 81 80 81 90 101 125 97 47 39 36 29 48 124 76 64 61 59 6 5 4 4 4 3 2 2 8 5 2 2 9 16 8 6 7 8 36 32 5 3 2 1 6 50 14 6 4 4 .2 .5 .5 .5 .3 .3 .8 .8 .3 .1 .7 .8 .3 .2 .8 .2 .6 .1 .0 .8 .9 .8 .9 .9 .1 MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) MAY 25 24 25 23 22 20 17 18 91 587 214 72 49 57 52 37 32 30 28 24 25 21 22 20 18 25 33 23 22 18 18 58 59 56 61 60 61 59 55 110 546 176 64 27 35 59 73 74 69 60 52 44 40 40 40 28 41 55 56 54 46 46 4. 3. 3. 3. 3. 3. 2. 2. 205 1640 123 14 3. 5. 7. 6. 6. 5. 4. 3. 3. 2. 2. 2. 1. 3. 4. 3. 3. 2. 2. 1 9 9 6 7 3 8 6 8 6 9 7 2 7 6 4 0 2 3 2 4 2 9 6 3 4 2 JUNE 19 21 22 20 31 76 50 35 34 40 25 21 18 727 789 229 121 83 65 93 74 52 71 76 358 194 108 74 59 51 --- 60 43 31 31 69 661 147 47 121 236 234 158 134 439 276 60 57 92 72 96 78 62 79 78 255 161 108 31 22 22 --- 2 2 1 1 7 149 21 5 17 6 17 11 6 2670 902 43 19 22 13 27 17 9 20 15 317 93 34 6 3 3 - .8 .5 .8 .8 .3 .0 .8 .9 .0 .7 .5 .1 -- TOTAL 1321 276.4 2084.5 3636 4464.2 RIO GRANDE DE LOIZA BASIN 50055000 RIO GRANDE DE LOIZA AT CAGUAS, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), HATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 241 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL YEAR JULY 67 72 50 53 56 189 129 87 58 55 51 46 41 63 117 99 77 110 204 104 65 50 45 95 344 340 172 94 70 58 50 47 85 61 70 50 147 122 75 49 54 61 75 60 73 109 99 82 108 166 101 74 63 56 92 312 218 137 52 26 23 22 11 17 8 11 8 104 46 18 8 8 8 9 6 14 48 30 19 35 97 31 13 8 7 42 368 266 70 26 5 3 2 .4 .7 .1 .1 .1 .3 .7 .8 .0 .0 .7 .8 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) AUGUST 46 77 83 121 116 72 62 357 160 1110 361 167 225 170 103 83 72 68 69 62 56 66 79 71 65 67 50 443 302 118 65 60 80 87 114 173 123 91 255 181 528 276 146 178 199 133 90 78 74 71 69 65 57 46 54 73 58 29 218 212 119 65 7. 19 21 64 60 25 16 307 79 2830 311 72 135 98 39 21 16 14 14 12 10 9. 9. 9. 13 10 4. 1140 265 43 12 2 8 2 8 1 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) SEPTEMBER 54 53 69 73 52 42 41 49 46 45 37 36 63 91 126 120 120 90 143 73 57 53 105 104 72 144 155 118 185 134 53 50 71 76 68 67 . 66 64 61 58 54 51 68 91 109 109 152 145 129 81 67 63 98 106 80 126 137 108 156 121 8 7 16 16 10 7 7 8 7 6 5 4 12 28 42 45 52 37 54 17 11 10 46 36 18 58 70 69 107 61 .0 .2 .5 .3 .5 .6 .7 .4 .6 3111 32809 1350.7 19809.9 4966 5686.1 2550 877.8 242 RIO GRANDE DE LOIZA BASIN 50055000 RIO GRANDE DE LOIZA AT CAGDAS, PR—Continued WATER QUALITY DATA, WATER YEAR AUGUST 1989 TO SEPTEMBER 1990 PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT DATE MAY 1990 10.. . 10.. . DATE MAY 1990 10. .. 10. .. TIME 0805 1418 SED. SUSP. FALL DIAM. PERCENT FINER THAN .016 MM 85 91 DIS- CHARGE, INST. CUBIC FEET PER SECOND 456 248 SED. SUSP. FALL DIAM. PERCENT FINER THAN .031 MM 86 -- SEDI- MENT, SUS- PENDED (MG/L) 483 459 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .062 MM 95 93 SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) 595 307 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .125 MM 97 96 SED. SUSP. FALL DIAM. PERCENT FINER THAN .002 MM 36 66 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .250 MM 98 97 SED. SUSP. FALL DIAM. PERCENT FINER THAN .004 MM 51 76 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .500 MM 99 99 SED. SUSP. FALL DIAM. PERCENT FINER THAN .008 MM 69 80 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN 1.00 MM 100 99 RIO GRANDE DE LOIZA BASIN 50055000 RIO GRANDE DE LOIZA AT CAGUAS--Continued SILT AND CLAY PERCENT OP SUSPENDED SEDIMENT 243 DATE APR 1990 27. .. JUN 06. .. 07. .. 11. . . 25. .. 27. .. JUL 25. . . AUG 08. . . 10. .. TIME 1225 1420 1005 1025 0925 1555 1020 1530 1440 STREAM- PLOW, INSTAN- TANEOUS (CPS) 80 73 50 28 552 104 180 520 1700 SEDI- MENT, SUS- PENDED (MG/L) 94 749 157 365 1040 766 759 1420 815 SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) 20 148 21 28 1550 215 369 1994 3740 SED. SUSP. SIEVE DIAM. PERCENT PINER THAN .062 MM 96 99 91 99 99 100 98 99 94 244 RIO GRANDE DE LOIZA BASIN 50055100 RIO CAGDITAS NEAR AGUAS BUENAS, PR LOCATION.--Lat 18°14'48", long 66°05'37", Hydrologic Unit 21010005, on right bank 450 ft (137 m) upstream from bridge on Highway 777, 1.0 mi (1.6 km) southeast from Aguas Buenas 3.9 mi (6.3 km) northwest from Caguas and 2.1 mi (3.4 km) southwest from Las Carolinas. DRAINAGE AREA.--5.30 mi 1 (13.7 km'). WATER-DISCHARGE RECORDS PERIOD OF RECORD.—February to September 1990. GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 394 ft (120 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. Gage-height and precipitation satellite telmetry at station. EXTREMES FOR CURRENT PERIOD.--Peak discharges greater than base discharge of 100 ftVs (2.83 mVs) and maximum (*): Mar. 14 Aug. 13 Time 0700 1630 Discharge (ft'/s) (m3/s) Gage height (ft) (m) 141 *1,040 3.99 29.0 11.00 *14.12 3.353 4.804 Date Sept. 3 Discharge Time (ft 3/s) (mV 1615 359 10.2 Minimum discharge, 1.8 ft'/s (0.051m3/s), May 3, 6-8, 24-26, 28-30. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES NOV JAN APR JUL Gage height (ft) (m) 12.07 3.679 SEP 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC-FT CFSM IN. e3 .6 e4.2 e4 .0 e3.4 e3.0 e2.7 e2.6 e3.0 e3.5 e5.0 e4.0 e3.6 2.9 4.8 3.2 3.0 3.4 3.7 3.4 3.1 3.7 4.3 3.7 3.7 3.4 3.4 3.0 2.9 ___ ___ --- 98.2 3.51 5.0 2.6 195 .66 .69 3.7 3.2 2.9 2.9 2.9 2.8 2.8 2.6 14 6.2 5.5 19 39 51 13 16 13 8.2 6.7 5.7 5.2 5.0 5.1 .8 .6 .6 .7 .9 5.1 5.2 4.6 274.9 8.87 51 2.6 545 1.67 1.93 4.3 4.0 3.9 3.7 3.7 3.8 3.7 3.6 3.8 3.9 3.4 3.5 5.8 4.0 3.4 3.0 3.0 3.1 4.6 3.8 3.0 2.6 2.5 2.1 9.6 5.3 2.7 2.3 2.0 2.0 --- 110.1 3.67 9.6 2.0 218 .69 .77 2.1 2. 1 2.0 2.0 2.1 2.0 1.8 1.9 6.9 4.9 4.0 2.7 2.8 3.1 2.7 2.6 2.3 2.3 2.3 2.1 2.1 2.0 2.0 1.9 1.8 1.9 2.0 2.0 2.0 2.0 2.6 77.0 2.48 6.9 1.8 153 .47 .54 2.3 2.7 2.5 2.7 3.0 2.8 4.0 3.3 2.7 2.2 2.1 2.1 2.0 4.1 12 5.6 4.3 3.8 3.6 3.5 3.5 3.5 8.5 5.4 6.2 4.5 4.0 3.6 3.5 3.5 --- 117.5 3.92 12 2.0 233 .74 .82 3.7 3.4 3.2 3.4 3.1 5.9 3.7 3.4 3.2 3.2 3.2 3.2 3.6 3.5 11 3.9 7.0 5.2 3.4 3.0 2.6 2.4 2.3 4.4 4.3 3.2 2.8 2.5 2.5 2.7 2.9 115.8 3.74 11 2.3 230 .70 .81 3.2 17 6.5 3.7 5.3 3.7 4.1 4.4 3.5 4.3 3.7 3.5 48 10 4.6 3.6 3.6 3.8 3.2 3.0 2.9 3.2 3.2 2.8 3.3 3.3 2.8 2.7 2.7 2.7 2.5 174.8 5.64 48 2.5 347 1. 06 1.23 2.7 4.6 38 10 4.5 4.5 4.1 3.7 3.5 e3.5 e3.1 3.4 3.1 3.5 3.4 4.4 3.6 3.6 3.5 3.3 3.1 6.0 4.6 3.7 3.4 3.2 3.7 3.2 3.1 4.3 152.3 5.08 38 2.7 302 .96 1.07 Estimated RIO GRANDE DE LOIZA BASIN 50055100 RIO CAGUITAS NEAR AGDAS BDENAS, PR--Continued WATER QUALITY RECORDS PERIOD OP RECORD.-- OCTOBER 1989 TO SEPTEMBER 1990 STREAHFLOH, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANBODS DDCTANCE TORE (CFS) (DMHOS) (DEG C) MAR. 08 1540 APR. 09 1133 MAY 24 1324 JUNE 27 1119 2.65 3.63 1.82 4.02 341 332 337 348 23.5 23.0 26.5 25.0 DATE TIME JULY 24 0846 ADG. 15 0938 SEPT 11 1442 STREAMFLOW, INSTANTANBODS (CFS) 3.06 4.92 3.04 245 SPECIFIC CON- TEMPERA- DDCTANCE TORE (DHHOS) (DEG C) 330 322 360 24.0 24.5 26.5 246 RIO GRANDE DE LOIZA BASIN 50055250 RIO CAGOITAS AT HIGHWAY 30 AT CAGOAS, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°15'11", long 66°01'26", at Highway 30 bridge, and 0.8 mi (1.3 km) east of Caguas plaza. DRAINAGE AREA.--14.1 mi 1 (36.5 km a ). PERIOD OF RECORD.--Water years 1972 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 11. . . DEC 07. . . FEB 1990 06. . . APR 11. . . JUN 05. . . AUG 08. . . TIME 0920 1035 0920 1120 1040 0930 DIS- CHARGE, INST. CUBIC FEET PER SECOND 36 21 17 19 19 66 SPE- CIFIC CON- DUCT- ANCE (US/CM) 576 637 670 650 313 334 PH (STAND- ARD UNITS) 7.30 7.30 7.20 7.40 7.10 7.40 TEMPER- ATURE WATER (DEG C) 27.0 26.0 23.5 26.5 29.0 28.0 TUR- BID- ITY (NTU) 2.1 7.5 5.6 3.5 5.3 5.6 OXYGEN, DIS- SOLVED (MG/L) 4.2 2.1 2.6 3.0 3.0 3.1 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 52 25 30 37 39 39 OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 59 87 110 25 81 45 COLI- FORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) 240 K120000 30000 K15000 49000 240000 STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) 7300 K13000 7100 K100 180000 69000 DATE OCT 1989 11. .. DEC 07. . . FEB 1990 06. . . APR 11. . . JUN 05. . . AUG 08. . . HARD- NESS TOTAL (MG/L AS HARD- NESS NONCARB WH WAT TOT FLD CALCIUM DIS- SOLVED MG/L AS (MG/L CAC03) CAC03 140 140 98 MAGNE- SIUM, DIS- SODIUM, DIS- SOLVED SOLVED (MG/L 38 12 38 12 (MG/L AS CA) AS MG) AS NA) 36 47 SODIUM AD- SORP- TION RATIO POTAS- SIUM, DIS- SOLVED ALKA- LINITY WAT WH TOT FET FIELD SULFIDE TOTAL SULFATE DIS- SOLVED (MG/L MG/L AS 28 6.9 22 AS K) 5.2 5.7 4.3 CACO3 150 180 190 110 190 110 (MG/L (MG/L <0.5 47 <0.5 45 21 CHLO- RIDE, DIS- SOLVED (MG/L AS S) AS S04) AS CL) 42 72 22 DATE OCT 1989 11.. . DEC 07.. . FEB 1990 06.. . APR 11. .. JUN 05. . . AUG 08. . . FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.30 -- -- 0.10 -- <0.10 SILICA, DIS- SOLVED (MG/L AS SIO2) 28 -- -- 30 -- 19 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 298 -- -- 349 -- 189 SOLIDS, DIS- SOLVED (TONS PER DAY) 28.8 -- -- 18.0 -- 33.6 RESIDUE TOTAL AT 105 DEG . C , SUS- PENDED (MG/L) 9 <1 15 16 1 22 NITRO- GEN, NITRATE TOTAL (MG/L AS N) 1.18 0.31 -- 0.02 -- 0.19 NITRO- GEN, NITRITE TOTAL (MG/L AS N) 0.02 0.09 0.04 0.08 0.06 0.11 NITRO- GEN, NO2+NO3 TOTAL (MG/L AS N) 1.20 0.40 <0.10 0.10 <0.10 0.30 NITRO- GEN, AMMONIA TOTAL (MG/L AS N) 0.05 12.0 13.0 1.90 12.0 4.10 NITRO- GEN, ORGANIC TOTAL (MG/L AS N) 0.25 5.0 5.0 12 2.0 2.7 K = non-ideal count RIO GRANDE DE LOIZA BASIN 50055250 RIO CAGUITAS AT HIGHWAY 30 AT CAGUAS, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 247 DATE OCT 1989 11. .. DEC 07.. . FEB 1990 06.. . APR 11. .. OUN 05. .. AUG 08. .. DATE OCT 1989 11. .. DEC 07. .. FEB 1990 06. .. APR 11. .. JUN 05. .. AUG 08.. . NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.30 17 18 14 14 6.8 IRON, TOTAL RECOV- ERABLE (UG/L AS FE) 630 -- -- 4100 -- -- NITRO- GEN, TOTAL (MG/L AS N) 1.5 17 -- 14 -- 7.1 LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) 10 -- -- 2 -- -- NITRO- GEN, TOTAL (MG/L AS N03) 6.6 77 -- 62 -- 31 MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MM) 370 -- -- 350 -- -- PHOS- PHORUS ARSENIC TOTAL TOTAL (MG/L (UG/L AS P) AS AS) 0.26 <1 3.1 3.8 3.1 1 3.8 1.0 MERCURY TOTAL SELE- RECOV- NIUM, ERABLE TOTAL (UG/L (UG/L AS HG) AS SE) 0.20 <1 __ __ 0.20 <1 __ __ BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 -- -- <100 -- " SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) 1 -- -- <1 -- -- CHRO- BORON, CADMIUM MIUM, TOTAL TOTAL TOTAL RECOV- RECOV- RECOV- ERABLE ERABLE ERABLE (UG/L (UG/L (UG/L AS B) AS CD) AS CR) 110 <1 2 __ __ 30 <1 2 __ .. ZINC, TOTAL RECOV- CYANIDE ERABLE TOTAL PHENOLS (UG/L (MG/L TOTAL AS ZN) AS CN) (UG/L) 30 <0.010 7 __ __ 20 <0.010 26 __ __ COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) <10 — -- 20 — METHY- LENE BLUE ACTIVE SUB- STANCE (MG/L) 0.21 -- -- 1.3 -- -- 248 RIO GRANDE DE LOIZA BASIN 50055400 RIO BAIROA NEAR CAGOAS, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°15'28", long 66°02'13" / at bridge on Highway 1, about 2.5 mi (4.0 km) upstream from Rio Grande de Loiza, and 1.4 mi (2.3 km) north of Caguas plaza. DRAINAGE AREA.--5.4 mi 3 (14.0 kma ). PERIOD OP RECORD.--Water years 1958, 1962-66, 1973-74, 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 11. .. DEC 07. .. PEB 1990 06. . . APR 11. .. JUN 19. .. AUG 08. .. TIME 1110 1130 1030 1240 1110 1100 DIS- CHARGE, INST. CUBIC FEET PER SECOND 7.4 4.1 3.0 3.4 360 9.8 SPE- CIPIC CON- DUCT- ANCE (US/CM) 432 423 445 430 432 296 PH (STAND- ARD UNITS) 8.00 7.70 7.50 7.70 7.63 7.60 TEMPER- ATURE WATER (DBG C) 26.5 24.0 22.0 25.0 27.0 26.5 TUR- BID- ITY (NTU) 1.1 0.90 1.2 1.5 32 2.8 OXYGEN, DIS- SOLVED (MG/L) 8.6 5.9 6.8 8.0 6.5 5.9 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 106 70 77 96 81 73 OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 16 20 14 16 16 25 COLI- PORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) 410 K6700 K7500 21000 3000 23000 STREP- TOCOCCI PECAL, KP AGAR (COLS. PER 100 ML) K1500 2000 1500 4200 2400 38000 DATE OCT 1989 11. . . DEC 07. . . PBB 1990 06. . . APR 11. . . JUN 19. .. AUG 08. .. HARD- NESS TOTAL (MG/L AS HARD- NESS NONCARB CALCIUM WH WAT TOT PLD CAC03) CAC03 150 150 DIS- SOLVED MG/L AS (MG/L MAGNE- SIUM, DIS- SODIUM, DIS- SOLVED SOLVED (MG/L (MG/L AS CA) AS MG) AS NA) 37 15 27 8.6 12 8.6 18 SODIUM AD- SORP- TION RATIO ALKA- POTAS- LINITY SIUM, WAT WH DIS- SOLVED AS K) 0.8 3.9 0.4 1.4 0.8 4.0 CHLO- SULPATE RIDE, TOT PET SULPIDE DIS- DIS- FIELD TOTAL SOLVED SOLVED (MG/L MG/L AS (MG/L CACO3 140 140 140 140 140 98 (MG/L <0.5 22 <0.5 8.4 11 (MG/L AS S) AS S04) AS CL) 31 <0.10 22 DATE OCT 1989 11. .. DEC 07.. . PEB 1990 06.. . APR 11.. . JUN 19. .. AUG 08.. . PLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.20 -- -- -cO.10 -- <0.10 SILICA, DIS- SOLVED (MG/L AS SI02) 27 -- -- 21 -- 21 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 244 -- -- 201 _- 170 SOLIDS, DIS- SOLVED (TONS PER DAY) 4.85 -- -- 1.88 -- 4.53 RESIDUE TOTAL AT 105 DBG. C, SUS- PENDED (MG/L) <1 9 16 2 <1 38 NITRO- GEN, NITRATE TOTAL (MG/L AS N) 0.28 1.78 1.46 1.57 1.54 0.86 NITRO- GEN, NITRITE TOTAL (MG/L AS N) 0.12 0.02 0.04 0.03 0.06 0.04 NITRO- GEN, NO2+N03 TOTAL (MG/L AS N) 0.40 1.8 1.5 1.6 1.6 0.90 NITRO- GEN, AMMONIA TOTAL (MG/L AS N) 6.8 0.09 0.02 0.18 0.07 0.14 NITRO- GEN, ORGANIC TOTAL (MG/L AS N) 3.2 0.21 0.38 0.02 0.63 0.46 K = non-ideal count RIO GRANDE DB LOIZA BASIN 50055400 RIO BAIROA NEAR CAGUAS, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 249 DATE OCT 1989 11. . . DEC 07.. . FEB 1990 06.. . APR 11. .. JUN 19. .. AUG 08. .. DATE OCT 1989 11. . . DEC 07. .. FEB 1990 06.. . APR 11.. . JUN 19.. . AUG 08. . . NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 10 0.30 0.40 0.20 0.70 0.60 IRON, TOTAL RECOV- ERABLE (UG/L AS FE) 160 -- -- 140 -- -- NITRO- GEN, TOTAL (MG/L AS N) 10 2.1 1. 9 1.8 2.3 1.5 LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) 4 -- -- 4 -- -- NITRO- GEN, TOTAL (MG/L AS N03) 46 9.3 8.4 8.0 10 6.6 MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) 80 -- -- 10 -- -- PHOS- PHORUS ARSENIC TOTAL TOTAL (MG/L (UG/L AS P) AS AS) 2.2 1 0.35 0.44 0.46 <1 0.53 0.51 MERCURY TOTAL SELE- RECOV- NIUM, ERABLE TOTAL (UG/L (UG/L AS HG) AS SB) <0.10 <1 __ __ <0.10 <1 __ __ BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 -- -- <100 -- " SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) <1 -- -- <1 -- -- BORON, TOTAL RECOV- ERABLE (UG/L AS B) 60 -- -- 10 -- "" ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) <10 -- -- <10 -- -- CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- 3 -- " CYANIDE TOTAL (MG/L AS CN) <0.010 -- -- <0.010 -- -- CHRO- MIUM, COPPER, TOTAL TOTAL RECOV- RECOV- ERABLE ERABLE (UG/L (UG/L AS CR) AS CU) 1 20 __ -- <1 <10 __ .. METHY- LENE BLUE ACTIVE PHENOLS SUB- TOTAL STANCE (UG/L) (MG/L) <1 0.08 __ __ 1 0.10 __ __ 250 RIO GRANDE DE LOIZA BASIN 50056400 RIO VALENCIANO NEAR JONCOS, PR LOCATION.--Lat 18°12'58", long 65°55'34 n , Hydrologic Unit 21010005, on left bank at Highway 919, 0.5 mi (0.8 km) upstream from Quebrada Don Victor, 1.7 mi (2.7 km) upstream from Rio Gurabo and 1.0 mi (1.6 km) south of Juncos. DRAINAGE AREA.--16.4 mi» (42.5 km'). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--January 1971 to current year. GAGE.--Water-stage recorder. Elevation of gage is 320 ft (98 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. Minor diversion from public water supply tank, 0.5 mi upstream, during low flow. Gage-height and precipitation satellite telemetry at station. AVERAGE DISCHARGE.--19 years (1972-90), 52.4 ft3 /s (1.484 m3 /s), 43.39 in/yr (1,102 mm/yr), 37,960 acre-ft/yr (46.8 hmVyr); median of yearly mean discharges, 52 ftVs (1.47 m3 /s), 37,700 acre-ft/yr (46 nm'/yr) . EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 40,000 ft 3/s (1,130 m3/s), Dec. 8, 1987, gage height, 25.63 ft (7.812 m), from floodmark and rating curve extended above 100 ft3/s (2.83 m3 /s) on basis of slope-area measurement and step-backwater analysis; minimum discharge, 1.4 ftVs (0.040 m3 /s), Apr. 21, 1988, result of diversion and June 12, 1990. EXTREMES OUTSIDE PERIOD OF RECORD.--Approximate discharges (no stages were recorded) of major floods are as follows: Sept. 6, 1960, 37,100 ftVs (1,050 mVs) ; Oct. 9, 1970, 18,200 ft3 /s (515 m3 /s) . EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 3,400 ft 3 /s (96.3 m3 /s) and maximum (*): Date Discharge Time (ft3 /s) (m3 /s) Gage height (ft) (m) Date Aug. 10 1100 *1,480 41.9 *5.38 1.640 Minimum discharge, 1.4 ft3/s (0.034 m3/s), June 12. Discharge Time (ft D/s) (mD/s) Gage height (ft) (m) DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES JAN APR JUN JUL AUG 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC- FT CFSM IN. CAL YR WTR YR 48 41 36 e40 e34 30 28 106 147 36 32 29 26 27 26 24 23 27 24 24 26 62 42 25 23 22 20 20 19 27 22 1116 36.0 147 19 2210 2.20 2.53 1989 1990 26 21 19 17 50 27 20 28 41 26 20 18 18 18 17 15 15 17 17 17 15 14 14 13 13 15 14 13 13 13 --- 584 19.5 50 13 1160 1.19 1.32 TOTAL 14720 TOTAL 6253. 13 13 12 12 12 12 13 11 11 11 10 10 9.8 9.3 9.0 8.9 9.1 9.3 9.6 9.4 8.8 8.1 8.1 14 19 9.7 8.6 9.6 15 14 11 340.3 11.0 19 8.1 675 .67 .77 .3 MEAN 6 MEAN 25 34 18 11 9.6 9.1 8.3 9.8 8.6 11 11 10 14 9.9 8.7 8.9 10 9.7 10 40 17 11 10 12 13 21 17 16 13 14 14 434. 6 14. 0 40 8.3 862 .85 .99 40.3 MAX 17 . 1 MAX 11 17 11 10 9.5 9.2 13 24 33 19 15 12 11 13 10 10 12 17 11 13 16 15 12 14 8.5 8.0 7 .8 6.9 _._ ___ --- 368.9 13.2 33 6.9 732 .80 .84 2140 MIN 393 MIN 7.4 7.1 6.2 6.2 5.9 6.1 6.1 5.0 6.3 6.3 6.2 9.4 11 49 e!4 e25 e!7 e9.6 e8.4 ell elO e8.6 9.6 6.8 7.4 7. 1 6.9 8. 6 8.4 7.0 7.8 311.4 10.0 49 5.0 618 .61 .71 8.2 AC-FT 1.8 AC-FT 5.5 5.7 20 8.9 6.0 4.8 4.7 4.2 4.3 4.7 5.9 4.7 24 11 5.5 4 .9 4.4 4 .1 4.6 e4 .0 e3.5 e2.9 e2.6 e2.5 e20 26 8.4 5.7 e4.0 e3.8 --- 221.3 7.38 26 2.5 439 .45 .50 29200 12400 e3.2 e3.1 e3.2 e3.0 e2.6 e2.3 e2.2 2.4 6.7 36 9.6 6. 1 4.8 10 7.2 e5.1 e4.0 e3.5 e3.1 e2.8 e2. 6 e2.5 e2.3 2.6 2.2 3.2 3.8 3.2 5.0 2.4 5.0 155.7 5.02 36 2.2 309 .31 .35 CFSM 2.46 CFSM 1. 04 3.8 7.8 3.7 3.5 10 16 8.5 5.0 3.7 4.3 3.4 1.8 2.0 98 94 29 12 8.2 10 32 12 7.9 5.4 9.8 27 17 8.2 6.0 5.0 4.6 459.6 15.3 98 1.8 912 .93 1.04 IN. 33 IN. 14 5.4 5.0 3.8 5.4 9.4 68 65 19 11 12 9.0 8.7 6.5 6.8 21 13 11 27 27 12 8.1 6.6 5.5 120 e!35 28 16 12 9.5 8.5 8.0 703.2 22.7 135 3.8 1390 1.38 1.60 .39 .18 7.6 9.9 10 11 9.6 11 9.3 136 30 393 80 41 60 44 27 22 19 18 21 15 11 11 16 23 23 16 12 16 26 12 10 1150.4 37.1 393 7.6 2280 2.26 2.61 9.4 8.5 9.2 16 10 8.5 7.7 9.8 9.7 24 11 11 47 27 20 17 23 24 18 11 e8.2 e8.0 e7.7 e8.2 e8.8 e9.4 9.4 8.6 9.5 8.6 ___ 408.2 13.6 47 7.7 810 .83 .93 e Estimated RIO GRANDE DE LOIZA BASIN 50056400 RIO VALENCIANO NEAR JUNCOS, PR--Continued WATER QUALITY RECORDS 251 PERIOD OF RECORD.--WATER YEARS AUGUST 1981 TO CURRENT YEAR STREAMFLOW, DATE TIME INSTANTANEOUS OCT. 05 1508 NOV. 15 1415 DEC. 06 1537 JAN. 16 1701 FEB. 22 1440 MAR. 06 1334 (CFS) 33.8 16.2 12.7 11.0 4.45 6.46 SPECIFIC CON- TEMPERA DUCTANCE TORE (UMHOS) 222 229 235 220 312 275 (DEC C) 28.5 26.5 26.0 25.5 22.5 26.0 DATE TIME APR. 11 1023 MAY 23 1247 JUNE 21 1446 JULY 25 1654 AUG. 23 1453 SEPT 18 0942 STREAMFLOW, INSTANTANEOUS (CFS) 4.78 2.19 9.60 32.4 10.1 14.6 SPECIFIC CON- TEMPERA- DUCTANCE (UMHOS) 269 280 299 200 308 256 TURK (DEC C) 27.5 33.0 29.5 28.0 30.0 27.0 252 RIO GRANDE DE LOIZA BASIN 50056900 QUEBRADA MAMEY NEAR GURABO, PR LOCATION.--Lat 18°14'57" / long 65°56'44", Hydrologic Unit 21010005, at left downstream side of bridge on Highway 189, 1.9 mi (3.0 km) southeast of Gurabo plaza, and 2.1 mi (3.4 km) northwest of Juncos plaza. DRAINAGE AREA.--2.30 mi s (5.96 km s ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--December 1983 to current year. GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 180 ft (55 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. AVERAGE DISCHARGE.--6 years (1985-90), 3.68 ftVs (0.104 m3/s), 21.73 in/yr (552 mm/yr), 2,670 acre-ft/yr (3.29 hrnVyr) . EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 2,740 ft3 /s (77.6 m3/s), Nov. 26, 1987, gage height, 11.04 ft (3.365 m) , from rating curve extended above 400 ft3/s (11.3 m3 /s) on basis of indirect measurement of peak flow and step-backwater analysis; minimum discharge, 0.20 ft3/s (0.006 m3/s), Feb. 10, 1987. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 500 ft3 /s (14.2 m3/s) and maximum (*) t Discharge (ft3/s) (m3/s) Gage height (ft) (m) Discharge Time (ft3/s) (m3/s) Date Time Oct. 6 1700 *140 3.965 *5.20 1.585 Minimum discharge, 0.15 ft3 /s (0.004 m3 /s), June 12, July 5,6. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES Gage height (ft) (m) DAY JUN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC-FT CFSM IN. CAL YR WTR YR 7.3 3.1 2.3 14 5.5 15 3.8 3.4 5.9 2.1 1.7 1.5 1.5 1.4 1.3 1.2 1.2 1.2 1.3 1.3 1.3 1.2 1.2 1.1 1.0 1.0 .99 .97 1.1 1.4 1.2 88.46 2.85 15 .97 175 1.24 1.43 1989 1990 1.1 1.0 1.0 1.0 1.1 1.3 1.3 1.3 1.2 1.1 .99 .98 .95 .94 1.0 1.0 1.1 1.1 1.5 1.2 1.3 1.1 1.1 1.2 1.2 1.2 1.2 1.1 1.1 1.1 --- 33.76 1.13 1.5 .94 67 .49 .55 TOTAL 1027. TOTAL 448. 1.1 1.2 1.2 1.2 1.2 1.4 1.3 1.3 1.3 1.6 1.4 1.2 1.2 1.3 1.4 1.3 1.4 1.5 1.6 1.7 1.6 1.4 1.4 1.5 1.4 1.3 1.2 1.3 1.4 1.4 1.4 42.1 1.36 1.7 1.1 84 .59 .68 ,34 MEAN 03 MEAN 2.0 2.0 2.3 1.4 1.2 1.3 1.3 1.2 1.1 1.3 1.3 1.3 1.4 1.5 1.2 1.2 1.1 1.0 1.1 1.2 1.3 1.1 1.2 1.3 1.2 1.2 1.3 1.3 1.2 1.2 1.2 40.9 1.32 2.3 1.0 81 .57 .66 2.81 MAX 1.23 MAX 1.4 1.6 1.6 1.5 1.4 1.3 1.8 2.2 2.4 1.7 1.2 .90 .72 1.1 .61 .44 .44 e.70 e. 68 e.60 e.64 e.82 e.85 e.86 e.60 e.48 e.46 e.41 ___ ___ --- 29.41 1.05 2.4 .41 58 .46 .48 235 MIN 32 MIN e.45 e.56 e.42 e.38 e.36 e.36 e.34 e.33 el. 4 .79 .92 1.1 .83 1.9 .65 .47 .45 .35 .29 8 .28 1 .29 .26 .32 .36 .30 .26 .29 .32 .32 .29 .27 15.91 18 .51 1.9 .26 32 .22 .26 .42 AC-FT .17 AC-FT .26 .25 .33 .28 .28 .25 .23 .23 .24 .25 .24 .28 .37 .47 .38 .36 .36 .34 .7 .4 .36 .22 .19 .18 .40 .33 .26 .21 .19 .20 --- .04 .60 8.7 .18 36 .26 .29 2040 889 .22 .23 .20 .21 .23 .23 .22 .23 .27 .45 .42 .37 .41 .50 .46 .43 .39 .42 .40 .39 .39 .37 .36 .32 .30 .31 .31 .36 .39 .36 .37 10.52 .34 .50 .20 21 .15 .17 CFSM 1.22 CFSM . 53 .36 .47 .48 .53 .58 .68 .48 .37 .42 .38 .26 .23 .30 4.0 4.2 .94 .37 .29 .29 2.0 .65 .30 .69 3.0 2.2 .58 .36 .30 .24 .23 --- 26.18 .87 4.2 .23 52 .38 .42 IN. 16, IN. 7 , .25 .24 .21 .20 .17 1.6 1.4 .49 .29 .29 .32 .29 .26 .31 .37 .44 .91 1.1 .66 .48 .37 .31 .29 8.7 6.4 3.6 2.7 .74 .48 .40 .34 34.61 1.12 8.7 .17 69 .49 .56 .62 .25 .32 .88 .96 12 4.1 .90 1.0 32 2.5 1.8 1.9 1.0 1.8 2.1 .97 .70 .70 .76 .68 .55 .49 .51 .55 .53 .52 .48 .45 .40 .42 .42 .39 72.78 2.35 32 .32 144 1.02 1.18 .39 .43 1.0 1.0 .58 .50 .46 .45 .50 .51 .48 .41 .41 3.7 1.9 .59 .52 1.1 1.2 .45 .29 2.2 7.9 3.0 3.5 .61 .41 .33 .26 .28 --- 35.36 1.18 7.9 .26 70 .51 .57 e Estimated RIO GRANDB DE LOIZA BASIN 253 50056900 QUEBRADA MAMEY NEAR GURABO, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS MARCH 1984 TO CURRENT YEAR STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (DMHOS) (DEC C) OCT. 06 0846 NOV. 16 1213 08 0928 09 1733 16 0820 09 1004 DEC. JAN. FEB. MAR. .80 .92 .22 .08 .42 .33 376 560 590 501 550 580 25.0 25.0 23.0 25.0 22.5 23.5 DATE TIME APR. 04 1530 MAY 07 1408 JUNE 18 1408 JULY 19 0927 AUG. 23 0832 SEPT 12 1304 STREAMFLOW, INSTANTANEOUS (CFS) .23 .23 .41 .54 .39 1.02 SPECIFIC CON- TBMPBRA- DUCTANCE TURE (DMHOS) (DEC C) 590 550 550 510 606 640 27.0 28.5 28.5 26.5 27.0 27.0 254 RIO GRANDS DE LOIZA BASIN 50057000 RIO GDRABO AT GURABO, PR LOCATION.--Lat 18°15'30", long 65°58'05 M , Hydrologic Unit 21010005, on left bank, at bridge on Highway 181, 0.3 mi (0.5 km) east of Gurabo, and 4.5 mi (7.6 km) upstream from Rio Grande de Loiza. DRAINAGE AREA.--60.2 mi 1 (155.9 km1 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--1958 (occasional low-flow measurements only), January to September 1959 (monthly measurements only), October 1959 to current year. GAGE.--Water-stage recorder and crest-stage gage. Datum of gage is 131.58 ft (40.10 m) above mean sea level. Prior to Oct. 1, 1989 datum 5.0 ft (1.5 m) higher. REMARKS.--Records fair. Gage-height and precipitation satellite telemetry at station. AVERAGE DISCHARGE.--31 years (1960-90), 137 ft3 /s (3.880 m3 /s), 30.90 in/yr (785 mm/yr), 99,260 acre-ft/yr (122hm3 /yr); median of yearly mean discharges, 127 ft3/s (3.60 mVs), 92,000 acre-ft/yr (110 hmVyr) . EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 74,600 ft3 /s (2,133 mVs), Sept. 6, 1960, gage height, 27.7 ft (8.44 m), from floodmark, from rating curve extended above 8,000 ft3 /s (227 m3 /s) on basis of slope-area measurement at gage height 21.6 ft (6.58 m), contracted opening, culvert and flow over road measurement at gage height 23.76 ft (7.242 m) , datum then in use, and estimate of peak flow based on slope-area measurements of Rio Gurabo and Rio Valenciano, 7.0 mi (11.3 km) upstream, adjusted for channel storage and flow from intervening area; minimum discharge, 4.5 ft3 /s (0.127 mVs), Feb. 21,25, 1968. EXTREMES OUTSIDE PERIOD OF RECORD.--Approximate elevation to gage datum of the Aug. 4, 1945 flood, as pointed out by local residents, 26.6 ft (8.11 m) , datum then is use. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 3,000 ft3 /s (85.0 m3/s) and maximum (*): Discharge Time (ft3 /s) (m3 /s) Gage height (ft) (m) Date Oct. 8 2200 *3,220 91.2 *14.21 4.331 Minimum daily discharge, 8.4 ft3/s (0.238 m3/s), May 7. Discharge Time (ft3/s) (m3/s) Date No other peak greater than base discharge. Gage height (ft) (m) DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES DAY NOV JAN FBB MAR JUN JUL SEP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC- FT CFSM IN. CAL YR WTR YR 276 196 164 502 367 196 152 669 826 222 161 132 114 106 183 119 92 86 83 128 125 112 99 62 63 57 55 51 55 121 94 5668 183 826 51 11240 3.04 3.50 1989 1990 78 66 55 51 116 97 66 115 128 97 59 49 56 50 44 42 38 39 40 41 39 34 33 32 31 30 31 28 27 29 --- 1641 54.7 128 27 3250 .91 1.01 TOTAL 57092 TOTAL 19801.1 28 30 32 33 33 34 30 27 26 25 25 23 23 22 22 22 22 22 23 23 23 21 20 25 35 24 22 21 22 30 23 791 25.5 35 20 1570 .42 .49 MEAN MEAN 40 115 84 41 29 26 25 26 25 26 30 28 29 30 25 25 26 28 28 52 68 34 30 33 34 40 40 36 29 29 26 1137 36.7 115 25 2260 .61 .70 156 54.2 26 30 28 24 23 21 23 35 60 87 37 35 28 39 41 27 25 44 42 36 39 50 52 53 38 29 28 25 ___ ___ --- 1025 36.6 87 21 2030 .61 .63 MAX 14700 MAX 826 27 35 26 23 22 22 21 20 57 87 44 95 134 192 67 42 106 36 28 25 26 23 26 24 21 20 24 32 29 23 22 1379 44.5 192 20 2740 .74 .85 MIN 20 MIN 8 . 4 19 19 30 24 19 18 17 16 16 15 15 15 25 44 25 19 19 15 29 18 14 12 11 10 26 85 21 15 12 11 --- 634 21.1 85 10 1260 .35 .39 AC -FT AC -FT 11 10 10 9.4 9.2 8.8 8.4 9. 0 10 28 26 16 12 15 22 16 14 13 13 12 11 11 10 10 9.9 9. 9 11 11 12 12 13 393.6 12.7 28 8.4 781 .21 .24 113200 39280 17 18 20 19 15 30 21 15 13 12 11 11 9.5 22 217 66 35 33 27 92 62 39 40 67 195 82 50 37 31 29--- 1335.5 44.5 217 9.5 2650 .74 .83 CFSM 2 . 60 CFSM . 90 28 29 27 26 26 103 269 62 34 28 24 23 20 20 25 39 29 78 137 42 29 24 21 134 317 73 56 38 31 27 24 1843 59.5 317 20 3660 .99 1.14 IN. 35.28 IN. 12.24 23 27 33 43 58 63 36 262 79 432 258 78 71 124 51 39 33 29 29 26 26 31 43 72 43 44 31 33 62 33 28 2240 72.3 432 23 4440 1.20 1.38 25 24 28 33 28 25 23 23 26 77 71 88 180 113 111 63 73 79 105 53 45 43 43 39 81 64 41 40 36 34 --- 1714 57.1 180 23 3400 .95 1.06 RIO GRANDE DE LOIZA BASIN 255 50057000 RIO GURABO AT GURAGO, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS AUGUST 1981 TO CURRENT YEAR SPECIFIC CON- TEMPERA- DUCTANCE TURE (UMHOS) (DEG C) DATE TIME NOV. 12 1014 DEC. 07 1133 JAN. 11 1338 FEB. 08 0955 MAR. 14 0900 APR. 05 0911 STREAMFLOW, INSTANTANEOUS (CFS) 63.2 25.8 30.1 38.6 134 19.7 298 370 308 366 212 329 26.5 26.0 27.5 24.0 24.5 DATE TIME MAY 08 0853 JUNE 20 1644 JULY 13 1315 AUG. 21 0932 SEPT 14 1318 STREAMFLOW, INSTANTANEOUS (CFS) 10.6 172 20.3 26.6 73.1 SPECIFIC CON- TEMPERA- DUCTANCE TURE (UMHOS) (DEG C) 391 270 350 356 232 27.0 29.5 31.5 29.5 28.5 25.5 256 RIO GRANDE DE LOIZA BASIN 50057000 RIO GORABO AT GURABO--Continued WATER-QUALITY RECORDS PERIOD OF DAILY RECORD.-- SUSPENDED-SEDIMENT DISCHARGE: October 1983 to September 1989. INSTRUMENTATION.-- USD-49 and automatic sediment sampler. EXTREMES FOR PERIOD OF DAILY RECORD.-- SEDIMENT CONCENTRATION: Maximum daily mean, 9,220 mg/L Nov 27, 1987; Minimum daily mean, 5 mg/L April 17 and 24, 1990. SEDIMENT LOADS: Maximum daily mean, 686,000 tons (622,340 tonnes) Nov 27, 1987; Minimum daily mean, 0.14 ton (0.13 tonne) April 24, 1990. EXTREMES FOR CURRENT YEAR.-- SEDIMENT CONCENTRATION: Maximum daily mean, 567 mg/L October 9, 1989; minimum daily mean, 5 mg/L April 17 and 24, 1990. SEDIMENT LOADS: Maximum daily mean, 2,050 tons (1,890 tonnes) October 8, 1989; minimum daily 0.14 ton (0.13 tonne) April 24, 1990. SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) OCTOBER 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 276 196 164 502 367 196 152 669 826 222 161 132 114 106 183 119 92 86 83 128 125 112 99 62 63 57 55 51 55 121 94 217 126 68 296 282 163 136 421 567 86 38 32 25 21 149 105 60 29 28 114 114 98 93 44 37 25 20 20 20 91 78 167 71 30 1210 335 88 59 2050 1920 56 16 11 7 6 84 35 15 6 7 48 43 43 29 7 6 3 2 2 2 57 23 .7 .3 .5 .3 .8 .0 .9 .9 .7 .a NOVEMBER 78 66 55 51 116 97 66 115 128 97 59 49 56 50 44 42 38 39 40 41 39 34 33 32 31 30 31 28 27 29 ___ 35 30 28 24 92 88 63 93 126 86 34 19 14 12 20 40 33 30 29 28 28 27 25 23 21 20 28 24 21 16 ___ 7 5 4 3 35 25 11 37 47 26 5 2 1 1 2 4 3 3 3 3 2 2 2 2 1 1 2 1 1 1 - . 1 .7 .1 .3 .7 .5 .9 .7 .7 .7 .1 .1 .2 .2 .8 .5 .3 .0 .7 .7 .4 .8 .6 .2 -- DECEMBER 28 30 32 33 33 34 30 27 26 25 25 23 23 22 22 22 22 22 23 23 23 21 20 25 35 24 22 21 22 30 23 11 10 10 11 12 12 19 20 20 25 20 20 20 18 13 10 10 10 15 11 27 23 20 24 29 20 13 10 10 32 29 . . . 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. . 1. 1. 1. 1. 3. 1. 2. 1. 81 78 87 93 0 1 5 4 4 7 3 3 2 0 78 58 56 59 95 64 6 3 0 8 1 4 75 55 62 7 8 TOTAL 5668 6443.9 1641 253.0 791 37.01 RIO GRANDE DE LOIZA BASIN 257 50057000 RIO GDRABO AT GDRABO--Continued SEDIMENT DISCHARGE, SDSPENDED (TONS/DAY), WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) JANDARY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 40 115 84 41 29 26 25 26 25 26 30 28 29 30 25 25 26 28 28 52 68 34 30 33 34 40 40 36 29 29 26 47 94 49 26 23 21 19 16 12 10 10 10 12 30 23 19 18 18 17 39 68 37 30 28 24 21 21 21 20 20 19 5. 35 13 3. 1. 1. 1. 1. • 1. 2. 1. 1. 1. 1. 1. 12 15 3. 2. 2. 2. 2. 2. 2. 1. 1. 1. 7 0 8 4 3 1 79 74 81 72 0 7 6 3 2 3 2 5 4 4 2 2 3 0 7 6 5 FEBRDARY 26 30 28 24 23 21 23 35 60 87 37 35 28 39 41 27 25 44 42 36 39 50 52 53 38 29 28 25 __. ___ _.- 20 21 21 17 14 10 11 24 56 78 37 28 25 40 44 32 26 42 39 25 20 20 20 41 37 25 18 11 .__ -_. .__ 1. 1. 1. 1. 2. 10 21 3. 2. 1. 4. 5. 2. 1. 5. 4. 2. 2. 2. 2. 6. 4. 2. 1. - - - 3 7 7 1 83 56 70 5 9 4 9 7 2 4 8 7 6 6 0 7 8 3 1 1 3 77 -- -- -- MARCH 27 35 26 23 22 22 21 20 57 87 44 95 134 192 67 42 106 36 28 25 26 23 26 24 21 20 24 32 29 23 22 6 32 30 23 21 18 14 12 43 85 51 55 55 127 67 45 97 45 38 36 34 33 32 31 31 31 30 31 22 21 21 3. 2. 1. 1. 1. 18 28 6. 15 21 98 14 5. 33 4. 2. 2. 2. 2. 2. 2. 1. 1. 2. 2. 1. 1. 1. 44 2 2 4 2 0 75 63 3 6 8 8 4 3 1 2 1 7 7 0 9 6 3 2 TOTAL 1137 124.46 1025 98.66 1379 280.82 258 RIO GRANDB DB LOIZA BASIN 50057000 RIO GURABO AT GURABO--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN DISCHARGE (CFS) 19 19 30 24 19 18 17 16 16 15 15 15 25 44 25 19 19 15 29 18 14 12 11 10 26 85 21 15 12 11 ___ MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) APRIL 21 20 28 27 19 19 19 19 18 19 25 29 31 46 20 7 5 7 28 24 14 10 7 5 23 81 28 20 19 15 MAY 1.1 .98 2.6 1.9 .97 .90 .85 .80 .75 .77 1.0 1.2 2.7 6.7 1.3 .36 .24 .28 4.0 1.3 .52 .33 .22 .14 7.0 26 1.8 .81 .63 .47 11 10 10 9.4 9.2 8.8 8.4 9.0 10 28 26 16 12 15 22 16 14 13 13 12 11 11 10 10 9.9 9.9 11 11 12 12 13 12 12 12 14 17 19 19 12 10 43 20 19 24 29 26 17 14 11 10 10 10 10 10 10 8 8 10 10 10 9 10 .38 .38 .37 .42 .49 .55 .50 .29 .29 3.9 1.3 .85 .81 1.2 1.6 .81 .49 .39 .34 .32 .31 .28 .30 .25 .22 .22 .27 .31 .31 .28 .33 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) JUNE 17 18 20 19 15 30 21 15 13 12 11 11 9.5 22 217 66 35 33 27 92 62 39 40 67 195 82 50 37 31 29 10 10 10 10 10 293 250 145 95 73 58 40 23 26 299 70 62 63 60 97 65 45 44 65 168 77 25 29 26 22 . 26 17 6. 3. 2. 1. 1. . 7. 242 13 5. 5. 4. 30 12 4. 5. 29 102 18 3. 3. 2. 1. 43 48 52 50 42 1 2 3 7 2 59 5 9 3 4 8 7 6 0 2 7 TOTAL 634 68.62 393.6 18.76 1335.5 550.54 RIO GRANDE DE LOIZA BASIN 259 DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL YEAR MEAN DISCHARGE (CFS) 28 29 27 26 26 103 269 62 34 28 24 23 20 20 25 39 29 78 137 42 29 24 21 134 317 73 56 38 31 27 24 1843 19801.1 50057000 RIO GORABO AT GORABO--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) JULY 28 29 27 26 26 103 269 62 34 28 24 23 20 20 25 39 29 78 137 42 29 24 21 134 317 73 56 38 31 27 24 21 21 20 20 20 85 310 322 283 253 235 215 223 231 223 218 209 268 290 240 225 216 211 250 257 87 91 96 103 108 110 1 1 1 1 1 38 279 57 26 19 16 12 601 12 16 22 17 133 117 29 17 13 11 204 344 17 13 8 7 7 6 .6 .5 .5 .4 .4 .9 .7 .0 .5 MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) AUGUST 23 27 33 43 58 63 36 262 79 432 258 78 71 124 51 39 33 29 29 26 26 31 43 72 43 44 31 33 62 33 28 110 101 76 64 57 61 37 265 325 514 199 83 67 116 73 54 39 25 19 17 15 15 17 94 85 79 75 70 67 42 36 6 6 6 8 13 11 3 226 73 893 181 18 17 44 11 5 3 2 1 1 1 1 2 19 11 9 6 6 12 3 2 .1 .9 .2 .2 .5 .6 .5 .0 .4 .2 .0 .3 .0 .3 .5 .7 .8 .6 SEPTEMBER 25 24 28 33 28 25 23 23 26 77 71 88 180 113 111 63 73 79 105 53 45 43 43 39 81 64 41 40 36 34 ___ 33 32 36 36 28 24 22 21 20 67 70 75 154 106 105 69 65 76 96 57 42 51 50 47 76 71 47 43 41 41 --- 2 2 3 3 2 1 1 1 1 16 15 32 81 37 35 12 12 22 32 8 5 5 5 5 23 15 5 4 4 4 - .1 .0 .0 .4 .2 .6 .4 .3 .4 .8 .2 .5 .9 .6 .4 .7 .0 .1 -- 2050.5 11932.67 2240 1606.8 1714 399.6 260 RIO GRANDE DB LOIZA BASIN 50057000 RIO GORABO AT GURABO--Continued SILT AND CLAY PERCENT OF SUSPENDED SEDIMENT DATE MAY 1990 10.. . 29.. . 31... OUN 01.. . 15.. . OUL 20.. . AOG 06. . . TIME 0835 1630 1115 1640 1437 1327 1232 STREAM- FLOW, INSTAN- TANEOUS (CFS) 39 12 15 17 114 38 50 SEDI- MENT, SUS- PENDED (MG/L) 90 426 12 403 210 232 486 SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) 9.5 14 .49 18 65 24 66 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .062 MM 90 79 88 82 93 100 100 RIO GRANDS DB LOIZA BASIN 261 50057025 RIO GURABO NEAR GURABO, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°15'56", long 65°59'04", at bridge on Highway 941, 1.2 mi (1.9 km) west-northwest from gaging station 50057000, and 1.0 mi (1.6 km) northwest of Gurabo plaza. DRAINAGE AREA.--62.8 mi 3 (162.7 km3 ). PERIOD OF RECORD.—Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DIS- CHARGE INST. CUBIC FEET DATE TIME PER , SPE- CIFIC CON- DUCT- ANCE SECOND (US /CM) OCT 13 DEC 12 FBB 06 APR 20 JUN 20 AUG 20 1989 0750 50 0830 15 1990 0745 17 0945 40 1110 1010 0730 17 HARD- HARD- NESS 346 425 430 366 346 373 NESS NONCARB CALCIUM TOTAL WH WAT DIS- (MG/L TOT FLD SOLVED DATE AS MG/L AS (MG/L OCT 13 DEC 12 FBB 06 APR 20 JUN 20 AUG 20 CACO3 ) CACO3 1989 110 0 1990 . . . -- -- 110 0 120 3 AS CA) 26 -- -- 24 -- 28 PH (STAND- ARD UNITS) 7.20 6.90 7.00 7.30 7.10 7.40 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 11 -- -- 12 -- 13 SOLIDS, TEMPER- ATURE WATER (DEG C) 27.0 25.0 22.5 25.5 29.5 29.5 TUR- BID- ITY (NTU) 10 4.6 2.6 15 6.4 11 OXYGEN, DIS- SOLVED (MG/L) 4.7 5.4 4.5 3.7 3.0 2.9 SODIUM POTAS- SODIUM, DIS- SOLVED (MG/L AS NA) 25 -- -- 29 -- 30 AD- SORP- SIUM, DIS- TION SOLVED RATIO 1 -- -- 1 -- 1 (MG/L AS K) 4.5 -- -- 4.3 -- 5.0 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 59 65 52 45 39 38 ALKA- LINITY WAT WH TOT FET FIELD MG/L AS CACO3 113 150 130 110 98 120 OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 29 23 17 22 29 23 SULFIDE TOTAL (MG/L AS S) <0.5 -- -- <0.5 -- "" COLI- FORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) K1600 3400 3800 49000 5900 4400 SULFATE DIS- SOLVED (MG/L AS S04) 17 -- -- 14 -- 17 STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) 480 390 K180 K14000 2000 390 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 23 -- -- 28 -- 34 RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL RIDE, DIS- SOLVED DATE (MG/L AS F) OCT 1989 13... 0.10 DEC 12... FBB 1990 06... APR 20... <0.10 JUN 20... AUG 20... <0.10 DIS- CONSTI- DIS- AT SOLVED TUENTS, SOLVED DEG (MG/L 105 NITRO- NITRO- NITRO- NITRO- NITRO- GEN, GEN, GEN, GEN, GEN, . C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC DIS- (TONS SUS- AS SOLVED SIO2) (MG/L) 28 -- -- 26 -- 33 202 -- -- 204 -- 232 PER FENDED DAY) (MG/L) 27.3 -- -- 22.0 -- 10.8 12 14 19 26 26 16 TOTAL TOTAL TOTAL TOTAL TOTAL (MG/L (MG/L (MG/L (MG/L (MG/L AS N) AS 0.83 0 0.90 0 1.53 0 1.1 0 1.21 0 1.4 0 N) AS .07 0 .10 1 .07 1 .10 1 .19 1 .10 1 N) AS .90 0 .0 0 .6 0 .2 0 .4 0 .5 0 N) AS .17 .89 .21 .38 .53 .39 0 0 0 0 N) .53 .41 .69 .62 1.2 0 .61 K = non-ideal count 262 RIO GRANDE DE LOIZA BASIN 50057025 RIO GURABO NEAR GURABO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 13. .. DEC 12. .. FEB 1990 06. . . APR 20. .. JON 20. . . AOG 20. . . DATE OCT 1989 13... DEC 12.. . FEB 1990 06. . . APR 20. . . JON 20. .. AOG 20. . . NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.70 1.3 0.90 1.0 1.7 1.0 IRON, TOTAL RECOV- ERABLE (OG/L AS FE) 940 -- -- 1700 -- -- NITRO- GEN, TOTAL (MG/L AS N) 1.6 2.3 2.5 2.2 3.1 2.5 LEAD, TOTAL RECOV- ERABLE (OG/L AS PB) 2 -- -- 2 -_ -- NITRO- GEN, TOTAL (MG/L AS NO3) 7.1 10 11 9.7 14 11 MANGA- NESE, TOTAL RECOV- ERABLE (OG/L AS MM) 270 -- -- 510 -- PHOS- PHOROS TOTAL (MG/L AS P) 0.25 0.34 0.59 0.49 0.61 0.54 MERCURY TOTAL RECOV- ERABLE (OG/L AS HG) <0. 10 -_ -- 0. 10 -- -- BARIOM, TOTAL ARSENIC RECOV- TOTAL ERABLE (OG/L (OG/L AS AS) AS BA) <1 <100 __ __ 1 100 __ __ SILVER, SELE- TOTAL NIOM, RECOV- TOTAL ERABLE (OG/L (UG/L AS SE) AS AG) <1 <1 __ __ <1 <1 __ __ BORON, TOTAL RECOV- ERABLE (OG/L AS B) 30 -- -- 50 -- - - ZINC, TOTAL RECOV- ERABLE (OG/L AS ZN) 10 -- -- <10 -- -- CADMIUM TOTAL RECOV- ERABLE (OG/L AS CD) <1 -- -- <1 -- " CYANIDE TOTAL (MG/L AS CN) <0.010 -- -- <0.010 -- -- CHRO- MIOM, COPPER, TOTAL TOTAL RECOV- RECOV- ERABLE ERABLE (OG/L (OG/L AS CR) AS CO) 1 10 __ __ 2 60 __ " METHY- LENE BLOE ACTIVE PHENOLS SUB- TOTAL STANCE (OG/L) (MG/L) <1 0.08 __ __ 3 0.08 __ __ RIO GRANDE DE LOIZA BASIN 50059000 LAGO LOIZA AT DAMSITE, PR 263 LOCATION.--Lat 18°19'49", Long 66°01'00", Hydrologic Onit 21010005, at pumpsite at damsite, and 1.9 mi (3.1 km) south of Trujillo Alto plaza. DRANAIGE ARBA.--208 mi a (539 km a ). ELEVATION RECORDS PERIOD OF RECORD.—December 1987 to current year. GAGE.--Hater-stage recorder. Datum of gage is mean sea level. REMARKS.--Lake is formed by Loiza Dam, a concrete structure completed in 1954. Useable capacity of impoundment is 30,000 acre-ft (37.0 hm3 ) . Out flow from lake is controlled by five slide gates in powerplant and pump intake structure, four sluice gates, and concrete spillway with eight radial gates. Lake is used for municipal water supply and intermittent power generation. Gage-height satellite telemetry at station. EXTREMES OBSERVED FOR PERIOD OF RECORD.--Maximun elevation 147.42 ft (44.93 m), Sept. 18, 1989; minimun elevation, 125.86 ft (38.36 m), June 12, 1988. EXTREMES OBSERVED FOR CURRENT YEAR.--Maximum elevation 135.69 ft (41.36 m), Oct. 8; minimum elevation, 127.29 ft (38.80 m), Jan. 20. Capacity Table (based on data from Puerto Rico Electric Power Authority) Elevation, in feet 98.4 111.5 120.4 Contents in acre-feet 5 8.9 13 Elevation, in feet 128.6 137.8 147.6 Contents in acre-feet 18 26 35 ELEVATION (FEET NGVD), WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 OBSERVATION AT 24:00 VALUES OCT NOV DEC 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 134.41 134.78 132.64 134.13 134.82 132.48 134.74 134.80 132.27 133.83 134.82 132.10 134.27 134.82 131.90 134.85 134.43 131.72 134.01 134.49 131.56 135.69 134.89 131.38 135.04 134.27 131.16 133.88 134.45 130.98 134.16 134.40 134.60 134.77 134.09 134.29 134.41 134.53 134.68 134.84 134.52 134.84 134.66 134.82 134.93 134.47 134.50 134.51 134.54 134.48 134.42 134.36 134.28 134.22 134.18 134.12 134.02 133.90 133.78 133.63 130.79 130.59 130.41 130.30 130.18 130.08 129.95 129.87 129.79 129.70 129.60 129.45 12 9. 3 0 129.18 129.08 JAN 128.47 128.79 128.99 129.01 128.91 128.79 128.72 128.60 128.49 128.36 128.28 128.19 128.06 127.98 127.82 127.71 127.60 127.47 127.35 127.31 127.67 127.64 127.61 127.56 127.50 FEB 128.04 127.98 127.97 127.85 127.67 127.49 127.45 127.59 127.81 128.05 128.04 127.96 127.84 127.88 127.90 127.84 127.78 127.85 128.03 127.99 128.05 128.25 128.43 129.01 129.18 MAR 129.08 129.04 128.94 128.81 128.67 128.55 128.38 128.18 128.51 128.79 129.18 129.82 131.30 133.14 133.53 134.17 134.55 134.60 134.58 134.55 134.48 134.43 134.36 134.30 134.22 APR 133.91 133.79 133.70 133.58 133.44 133.29 133.13 132.97 132.82 132.68 132.50 132.34 132.30 132.39 132.30 132.17 132.01 132.04 132.36 132.53 132.43 132.29 132.13 131.94 132.08 MAY 132.04 131.88 131.70 131.52 131.31 131.20 130.96 130.75 131.46 132.94 133.32 133.36 133.34 133.34 133.32 133.20 133.08 132.92 132.79 132.56 132.36 132.16 131.93 131.71 A JUN 129.88 129.68 129.54 129.36 129.22 129.26 129.26 129.12 128.93 128.79 128.58 128.36 128.10 130.39 133.38 133.94 134.08 134.18 134.16 134.36 134.34 134.28 134.54 134.42 134.09 JUL 134.00 133.95 133.85 133.76 133.72 133.60 134.36 134.52 133.86 133.78 133.70 133.58 133.46 133.36 133.68 133.79 134.04 134.28 134 .36 134.44 134.40 134.29 134.18 134.22 133.82 AUG 133.26 133.46 133.56 133.66 133.84 133.93 134.00 134.34 133.48 133.84 133.68 134.04 133.54 132.74 132.74 132.80 132.82 132.82 132.80 132.74 132.68 132.70 132.76 132.86 132.88 SEP 134.14 134.24 133.17 133.38 133.38 133.34 133.58 133.56 133.54 133.58 133.60 133.60 133.94 134.22 134.54 134.74 133.34 133.62 134.20 134.28 134.26 134.30 134.38 134.44 134.52 26 27 28 29 30 31 134.95 134.97 134.95 134.32 134.50 134.70 133.49 133.35 133.18 133.01 132.85 ___ 128.98 128.82 128.66 128.63 128.59 128.49 127.58 127.90 128.00 128.10 128.10 128.06 129.20 129.16 129.06 ___ ___ ___ 134.17 134.15 134 .15 134.14 134 .10 134.02 132.53 132.56 132.44 132.29 132.14 ___ A 131.02 130.78 130.54 130.30 130.04 134.10 134.18 134.18 134.10 134.02 ___ 133.10 133.52 133. SO 133.58 133.52 133.38 132.88 132.80 133. 64 134.20 134.26 134.20 134.72 133.18 133.28 133.52 133.74 ___ MEAN 134.57 134.20 130.28 128.08 128.12 132.03 132.64 MAX 135.69 134.89 132.64 129.01 129.20 134.60 133.91 MIN 133.83 132.85 128.49 127.31 127.45 128.18 131.94 131.83 134.54 128.10 133.86 134.52 133.10 133.35 134.34 132.68 133.88 134.74 133.17 A No gage-height record. 264 RIO GRANDE DE LOIZA BASIN 50059000 LAGO LOIZA AT DAMSITE, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°19'49", long 66°01'00", at pumphouse at damsite, and 1.9 mi j (3.1 km») south of Trujillo Alto plaza. DRAINAGE AREA.--208 mi*(539 km3 ). PERIOD OF RECORD.--Water years 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 25.. . DEC 15. .. PEB 1990 06. . . APR 20. . . JUN 05. . . AUG 08. . . DATE OCT 1989 25. .. DEC 15. .. FEB 1990 06.. . APR 20. . . JUN 05.. . AUG 08.. . DATE OCT 1989 25. . . DEC 15. .. FEB 1990 06.. . APR 20. . . JUN 05. . . AUG 08. .. TIME 0720 1125 1125 1110 1140 1200 ALKA- LINITY WAT WH TOT FET FIELD MG/L AS CAC03 86 110 120 100 100 87 NITRO- GEN, TOTAL (MG/L AS N03) 4.0 4.4 9.7 4.0 3.1 11 DIS- CHARGE, INST. CUBIC FEET PER SECOND L L L L L L SULFIDE TOTAL (MG/L AS S) 0.8 -- -- <0.5 -- — - PHOS- PHORUS TOTAL (MG/L AS P) 0.14 0.21 0.24 0.23 0.24 1.4 SPE- CIFIC CON- DUCT- ANCE (US/CM) 264 348 385 330 324 279 RESIDUE TOTAL AT 105 DEC. C, SUS- PENDED (MG/L) 1 7 4 19 2 8 BORON, TOTAL RECOV- ERABLE (UG/L AS B) 30 -- -- 40 -- -- PH (STAND- ARD UNITS) 6.90 7 .10 7.10 7.00 6.60 7.10 NITRO- GEN, NITRATE TOTAL (MG/L AS N) 0.23 0.35 0.93 0.07 0.08 0.06 COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) <10 -- -- 20 -- -- TEMPER- ATURE WATER (DEC C) 27.0 26.0 25.0 26.5 28.0 28.5 NITRO- GEN/ NITRITE TOTAL (MG/L AS N) 0.07 0.05 0.07 0.03 0.02 0.04 IRON, TOTAL RECOV- ERABLE (UG/L AS PE) 300 -- -- 210 -- -- OXYGEN, DIS- SOLVED (MG/L) 3.1 5.0 3.0 2.8 3.2 2.2 NITRO- GEN, N02+N03 TOTAL (MG/L AS N) 0.30 0.40 1.0 0.10 0.10 0.10 MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) 290 _- -- 290 -- -- OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 39 60 36 35 41 28 NITRO- GEN, AMMONIA TOTAL (MG/L AS N) 0.27 0.19 0.48 0.24 0.28 0.31 ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) 40 -- -- 40 -- -- OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 24 26 20 33 19 25 NITRO- GEN, ORGANIC TOTAL (MG/L AS N) 0.33 0.41 0.72 0.56 0.32 2.1 CYANIDE TOTAL (MG/L AS CN) <0.01 -- -- <0.01 -- -- con- PORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) 20 30 K4 86 K8 100 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.60 0.60 1.2 0.80 0.60 2.4 PHENOLS TOTAL (UG/L) 1 -- -- <1 -- -- STREP- TOCOCCI FECAL, KP AGAR (COLS. PER 100 ML) K10 K10 K9 54 43 K12 NITRO- GEN, TOTAL (MG/L AS N) 0.90 1.0 2.2 0.90 0.70 2.5 METHY- LENE BLUE ACTIVE SUB- STANCE (MG/L) 0.04 -- -- 0.07 -- -- L = Lake K = non-ideal count RIO GRANDB DK LOIZA BASIN 50059050 RIO GRANDB DK LOIZA BELOW DAMSITE, PR 265 LOCATION.--Lat 18°20'33" , long 660 00'20", Hydrologic Unit 21010005, on left bank of Highway 175, 1.1 mi (1.8 km) downstream of Lago Loiza Dam. DRAINAGE AREA.--209 mi 2 (541 km» ) . WATER-DISCHARGE RECORDS PERIOD OF RECORD.--December 1986 to current year. GAGE.--Water-stage recorder. Elevation of gage is 32 ft (10 m), from topographic map. REMARKS.--Records fair. Flow regulated by Lago Loiza Dam. Gage-height and precipitation satellite telemetry at station. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 124,300 ftVs (3,520 mVs), Nov. 27, 1987, gage height, 39.57 ft (12.06 m) , from floodmarks and rating curve extended above 100 ft'/s (2.83 m'/s) on basis of step-back water analysis; minimum daily discharge, 3.1 ftVs (0.09 m'/s), Sept. 1, 1989. EXTREMES FOR CURRENT YEAR.--Maximum discharge, 16,700 ft'/s (473 mVs), Oct. 9, gage height, 17.91 ft (5.46 m) , from rating curve extended above 100 ft'/s (2.83 m} /s) on basis of step-back water analysis; minimum daily discharge, 2.1 ft'/s (0.059 m'/s), Sept. 22,23. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC -FT CFSM IN. CAL YR WTR YR OCT 448 672 54 941 303 46 419 62 917 512 64 64 67 68 348 73 54 50 59 51 197 55 224 48 65 79 85 76 263 67 63 6494 209 941 46 12880 1. 00 1.16 1989 1990 NOV 60 63 65 63 357 61 60 60 327 77 62 59 58 60 81 89 83 75 70 69 65 68 67 76 86 82 82 81 78 75 --- 2659 88.6 357 58 5270 .42 .47 TOTAL 96848, TOTAL 16235. DEC 73 72 70 67 63 63 61 58 55 49 48 49 39 11 11 11 10 9.9 9.5 9.3 8.8 8.5 8.1 7.9 7.5 7.2 6.9 7.5 12 7.7 8.1 928.9 30.0 73 6.9 1840 . 14 .17 ,3 MEAN .6 MEAN JAN 8.3 7.3 6.5 6.1 5. 6 5. 6 5. 6 5.4 5.0 5.0 4.9 4.3 4.0 4.6 4.6 4.2 4.3 4.4 4.7 5. 1 4.2 4.0 4.9 5.6 4.6 4.5 4.5 4.7 4.8 4.8 4.5 156.6 5.05 8.3 4.0 311 .02 .03 265 44.5 FEB 4.5 4.5 4.5 4.9 5.4 5.1 4.5 4.9 4.1 4.2 4.0 3.9 3 .8 4.8 4.0 4.1 4.2 5.3 6.1 4.3 4.3 4.6 4.3 4.2 4.4 4.5 4.5 4.7 ___ ___ --- 126.6 4.52 6.1 3.8 251 .02 .02 MAX 22700 MAX 941 MAR 5.0 4.5 4.5 4.4 4.3 4.7 4.8 4.8 5.5 4.8 8.4 10 20 8.3 5.9 8.3 6.8 6.4 6.3 6.4 6.3 6.3 6.4 6.7 6.7 7.2 6.4 5.2 5.0 4.8 4.8 199.9 6.45 20 4.3 397 .03 .04 MIN 3 . 1 MIN 2 . 1 APR 4.8 4.7 4.8 4.8 4.8 4.8 4.8 5.0 5.4 5.4 5.3 5.3 5.3 6.8 5.8 5.6 5.7 6.0 5.8 6.6 6.2 6.7 6.9 6.9 13 6.9 6.4 6.0 5.9 5.9 --- 178.3 5.94 13 4.7 354 .03 .03 AC -FT AC -FT MAY 8.1 10 10 10 9.7 9.4 8.4 7.4 31 7.3 6.2 5.5 6.4 7.2 6.1 5.9 6.0 5.9 5.9 5.9 5.8 5.8 5.9 5.9 5.8 5.9 5.9 5.7 5.7 5.7 5.8 236.2 7.62 31 5.5 469 .04 .04 192100 CFSM 32200 CFSM JUN 6.3 6.2 6.9 7.0 6.7 6.0 5.9 5.7 5.4 4.7 4.9 4.6 4.6 5.7 5.6 5.1 4.8 4.6 4.8 4.8 27 7.9 5.9 53 406 112 6.4 5.0 4.7 4.4 --- 742.6 24.8 406 4.4 1470 .12 . 13 1.27 .21 JUL 4.2 4.0 3.9 3.8 3.7 172 3.7 3.9 179 5.6 4.2 5. 0 4.8 4.3 3.7 3.8 4.0 3.9 122 3.5 3.8 4.0 4.5 164 610 434 5.7 5.9 6.2 6.8 7.5 1795.4 57.9 610 3.5 3560 .28 .32 IN. 17.24 IN. 2.89 AUG 8.3 9.4 9.9 11 12 13 14 164 193 641 233 9.8 215 219 5.1 4.8 4.8 4.9 4.8 4.9 4.8 8.2 4.4 4.1 4.0 3.8 3.6 3.6 3.3 3.3 2.8 1827.6 59.0 641 2.8 3630 .28 .33 SEP 2.5 2.3 314 4.4 2.9 2.3 2.3 2.6 2.3 2.3 2.4 2.5 4.1 3.4 3.1 3.3 248 2.2 2.2 2.2 2.2 2.1 2.1 2.4 2.3 2.3 258 2.8 2.3 2.7 --- 890.5 29.7 314 2.1 1770 .14 .16 266 RIO GRANDK DK LOIZA BASIN 50059050 RIO GRANDK DK LOIZA BKLOW DAMSITK, PR--Continued WATKR QUALITY RKCORDS PKRIOD OF RECORD.-- OCTOBKR 1989 TO SKPTEMBKR 1990 SPKCIFIC CON- TEMPERA- DUCTANCE TURK (UMHOS) (DBG C) DATK OCT. NOV. DKC. JAN. FKB. MAR. TIME 11 0818 02 1500 07 1656 17 1644 08 1446 14 1511 STREAMFLOW, INSTANTANEOUS (CFS) 63.5 62.5 60 4.10 4.61 6.66 221 257 303 316 355 280 26.0 30.0 29.0 29.0 26.5 DATE TIME APR. 05 1348 MAY 15 1511 JUNE 26 1519 JULY 19 1458 AUG. 21 1433 STREAMFLOW, INSTANTANEOUS (CFS) 4.75 6.17 4.44 84.2 5.90 SPECIFIC CON- TEMPERA- DUCTANCE TURE (UMHOS) (DBG C) 329 350 287 285 260 31.5 31.5 25.5 29.5 33.5 27.0 RIO GRANDE DE LOIZA BASIN 50059050 RIO GRANDE DE LOIZA BELOW DAMSITE, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORD.-- Water years 1987 to 1990. PERIOD OF DAILY RECORD.-- SUSPENDED-SEDIMENT DISCHARGE: December 1986 to September 1990. EXTREMES FOR PERIOD OF DAILY RECORD.-- SEDIMENT CONCENTRATION: Maximum daily mean, 628 mg/L September 18, 1989; Minimum daily mean, 11 mg/L several days. SEDIMENT LOADS: Maximum daily mean, 79,900 tons (72,710 tonnes) December 8, 1987; Minimum daily mean, 0.10 ton (0.0 tonne) several days. EXTREMES FOR WATER YEARS 1987-88-89-90.-- 267 Water Suspended- sediment concentration (mg/L) Suspended- sediment discharge (tons per day) Year maximum minimum maximum minimum 1987 454 (Jun. 22) 17 (Feb. 16) 11,100 (Jun. 22) .22 (Feb. 16) 1988 578 (Dec. 07) 18 (Aug. 14) 79,900 (Dec. 08) .24 (Aug. 14) 1989 628 (Sep. 18) 16 (Jan. 07) 38,500 (Sep. 18) .16 (Sep. 01) 1990 210 (Oct. 04) 11 (several days) 534 (Oct. 10) .10 (several days) SEDIMENT DISCHARGE, SUSPENDED ( TONS / DAY ), WATER YEAR OCTOBER 1986 TO SEPTEMBER 1987 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) JANUARY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL 12 12 12 13 368 9. 450 9. 300 9. 9. 9. 9. 9. 11 365 7. 7. 7. 7. 7. 7. 7. 7. 8. 8. 8. 8. 8. 484 9. 2204. 8 5 8 4 1 0 9 6 5 5 6 6 6 6 9 0 0 3 3 4 3 7 29 29 29 30 141 26 156 25 123 26 25 24 25 26 28 141 22 22 22 22 22 22 22 23 23 23 24 24 24 161 25 -__ .94 .94 .94 1.1 140 .68 190 .64 100 .68 .64 .58 .60 .70 .84 139 .46 .44 .44 .46 .46 .46 .46 .50 .50 .50 .54 .54 .54 210 . 62 795.20 27 341 7 7 7 7 7 6 6 6 1290 307 584 421 5 4 5 5 5 6 6 6 6 6 6 6 6 6 - - - 3109 FEBRUARY .0 .0 .2 .0 .0 .7 .6 .8 .5 .9 .0 .5 .7 .0 .3 .3 .2 .1 .1 .6 .9 .7 -- -- -- .1 41 135 21 21 22 21 21 21 20 20 250 125 171 166 19 17 18 19 19 20 20 20 20 20 20 21 21 21 ___ ___ --- ___ 3.0 124 .40 .40 .42 .40 .40 .38 .36 .36 871 104 270 189 .28 .22 .24 .28 .30 .32 .34 .34 .34 .32 .32 .38 .40 .38 ___ ___ 1568.58 6 6 6 6 356 6 6 6 6 6 6 6 6 6 6 7 14 229 6 6 6 6 5 5 5 6 6 5 5 5 5 773 MARCH .8 .6 .3 .5 .5 .4 .1 .2 .1 .1 .1 .4 .4 .9 .6 .5 .3 . 1 .1 .8 .8 .8 .0 .1 .8 .8 .8 .8 .7 21 21 20 21 139 21 20 20 20 20 20 20 20 20 21 22 32 115 21 20 20 20 19 19 19 20 20 19 19 19 19 ___ .38 .38 .34 .36 134 .36 .34 .32 .34 .32 .32 .32 .34 .34 .40 .46 1.2 71 .36 .34 .32 .32 .30 .30 .30 .32 .32 .30 .30 .30 .30 215.60 268 RIO GRANDE DE LOIZA BASIN 50059050 RIO GRANDE DE LOIZA BELOW DAMSITE, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1986 TO SEPTEMBER 1987 MEAN DISCHARGE DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 (CFS) 5. 5. 5. 5. 6. 5. 5. 5. 5. 5. 20 1840 504 450 28 8. 378 6. 6. 6. 6. 6. 6. 6. 6. 6. 6. 6. 6. 6. -- 8 8 8 8 2 9 8 8 8 8 8 5 4 3 3 2 2 2 3 3 1 1 2 4 - MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) APRIL 19 19 19 19 20 19 19 19 19 19 37 286 163 156 42 24 144 21 20 20 20 20 20 20 20 20 20 20 20 20 .30 .30 .30 .30 .34 .30 .30 .30 .30 .30 2.0 1420 222 190 3.2 147 .58 .36 .34 .34 .34 .34 .34 .34 .34 .34 .32 .32 .34 .34 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) MEAN DISCHARGE (CFS) MAY 6 6 7 6 6 6 118 6 6 6 9 207 5 5 5 5 5 5 5 936 1830 495 383 5 377 1570 1320 13 488 9 12 .4 .4 .2 .5 .3 .4 .1 .4 .4 .7 .9 .9 .7 .6 .6 .8 .9 .3 .2 20 20 22 21 20 20 85 20 20 20 26 120 19 19 19 19 19 19 19 207 285 162 145 18 143 271 252 28 161 25 29 .34 .34 .42 .36 .34 .34 27 .32 .34 .34 .68 67 .30 .30 .30 .28 .28 .29 .30 522 1410 217 150 .26 146 1150 898 .98 212 .62 .94 10 330 348 463 10 9.6 10 181 10 235 11 9.6 10 18 675 452 9.8 28 1070 3500 4180 9050 882 434 394 48 394 237 40 461 ___ MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) JUNE 26 132 137 158 26 25 26 106 26 116 28 25 26 35 178 156 26 42 224 328 55 147 117 51 157 .70 118 129 198 .70 .64 .70 52 .70 74 .84 .64 .70 1.7 324 190 .68 3.2 647 3100 348 3930 454 11100 204 486 154 180 146 155 7.1 156 75 5.5 195 TOTAL 3368.8 1992.22 7871.7 4807.67 23510.0 21132.80 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 RIO GRANDK DE LOIZA BASIN 50059050 RIO GRANDE DE LOIZA BELOW DAMSITE, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1986 TO SEPTEMBER 1987 269 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CPS) (MG/L) (TONS/DAY) JULY 66 468 65 65 445 71 270 62 66 228 64 66 67 67 368 68 67 71 81 86 535 60 59 61 64 64 63 63 63 63 61 62 159 63 63 156 63 121 60 62 115 64 62 61 61 142 65 61 63 64 65 167 62 58 61 64 64 64 64 64 64 61 11 201 11 11 187 12 88 10 11 71 11 11 11 11 141 12 11 12 14 15 241 10 9.2 10 11 11 11 11 11 11 10 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CPS) (MG/L) (TONS/DAY) AUGUST 94 58 367 60 254 57 58 59 57 56 56 55 55 55 56 55 56 56 55 54 53 61 52 51 60 60 51 53 54 53 53 71 61 141 62 120 60 61 62 60 60 60 59 59 59 60 59 60 60 59 58 57 61 57 58 62 62 58 57 58 57 57 18 9 140 10 82 9 9 9 9 9 9 8 8 8 9 8 9 9 8 8 8 10 8 8 10 10 8 8 8 8 8 .6 .2 .6 .9 .2 .1 .1 .8 .8 .8 .1 .8 .1 .1 .8 .5 .2 .0 .0 .0 .2 .5 .2 .2 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CPS) (MG/L) (TONS/DAY) SEPTEMBER 333 55 73 56 54 52 53 53 58 61 72 61 61 60 60 62 60 61 61 62 60 61 60 59 58 58 59 60 60 61 133 59 66 60 58 57 57 57 61 61 62 61 61 62 62 60 62 61 61 60 60 60 62 62 61 61 62 62 62 61 120 8 13 9 8 8 8 8 9 10 12 10 10 10 10 10 10 10 10 10 9 9 10 9 9 9 9 9 9 9 .8 .1 .5 .0 .2 .2 .6 .7 .9 .9 .6 .6 .9 .9 .9 .6 TOTAL 3967 1208.2 2274 490.8 2064 403.4 270 RIO GRANDE DB LOIZA BASIN 50059050 RIO GRANDS DE LOIZA BELOW DAMSITE, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) OCTOBER 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 61 62 61 61 61 61 62 63 61 61 63 61 61 61 62 62 808 3940 588 332 64 61 66 89 574 63 64 63 64 67 67 61 60 61 61 61 61 60 65 61 61 65 61 61 61 60 60 196 341 172 133 64 61 62 66 170 65 64 65 64 61 61 10 10 10 10 10 10 10 11 10 10 11 10 10 10 10 10 428 3630 273 119 11 10 11 16 263 11 11 11 11 11 11 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) NOVEMBER MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) DECEMBER 66 66 64 65 416 134 58 71 71 67 64 60 61 58 55 55 70 369 55 55 56 54 56 14100 2870 4110 51200 6140 1290 116 .__ 62 62 64 63 151 91 61 63 63 61 64 61 61 61 59 59 63 141 59 59 60 58 60 541 316 346 506 392 250 83 __. 11 11 11 11 170 33 9.6 12 12 11 11 9.9 10 9.6 8.8 8.8 12 140 8.8 8.8 9.1 8.5 9. 1 20600 2450 3840 69900 6500 871 26 ___ 393 571 439 18 348 801 e!7800 e40000 elOOOO el520 628 51 581 473 83 466 52 254 698 689 761 767 68 638 351 86 631 63 495 74 905 143 170 154 35 136 194 578 740 481 268 175 57 171 160 67 159 57 118 180 179 189 190 65 176 137 65 175 65 162 65 206 152 262 183 1.7 128 420 27800 79900 13000 1100 297 7.8 268 204 15 200 8.0 81 339 333 388 393 12 303 130 15 298 11 217 13 503 TOTAL 7894 4989 81972 104733.0 80704 126982.5 e Estimated RIO GRANDE DE LOIZA BASIN 271 50059050 RIO GRANDE DE LOIZA BELOW DAMSITE, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 JAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN DISCHARGE (CFS) 1500 618 838 44 557 240 379 65 850 78 811 74 467 88 67 73 505 79 78 75 77 97 113 119 513 77 73 73 78 75 82 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) JANUARY 267 174 199 53 169 117 143 63 200 66 196 65 159 67 61 66 164 66 66 64 63 73 82 87 165 63 66 66 62 64 63 1080 290 450 6.3 254 76 146 11 459 14 429 13 200 16 11 13 224 14 14 13 13 19 25 28 229 13 13 13 13 13 14 MEAN MEAN CONCEN- SEDIMENT MEAN DISCHARGE TRATION DISCHARGE DISCHARGE (CFS) (MG/L) (TONS/DAY) (CFS) FEBRUARY 165 78 743 53 56 78 226 205 71 73 73 76 647 68 63 68 249 78 76 76 78 77 76 74 74 173 855 76 87 ___ 103 66 186 57 60 66 115 112 63 66 66 63 176 65 64 65 118 66 63 63 66 62 63 65 65 49 464 63 68 __. ___ 46 14 373 8.2 9.1 14 70 62 12 13 13 13 307 12 11 12 79 14 13 13 14 13 13 13 13 23 1070 13 16 _-. ___ 83 342 61 62 62 63 62 62 65 63 63 63 64 65 66 65 64 64 63 62 62 62 61 64 66 62 62 58 63 62 61 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) 83 342 61 62 62 63 62 62 65 63 63 63 64 65 66 65 64 64 63 62 62 62 61 64 66 62 62 58 63 62 61 67 135 61 60 60 60 60 60 63 65 65 64 64 63 62 63 64 64 64 60 60 60 61 64 62 60 60 61 65 60 61 15 125 10 10 10 10 10 10 11 11 11 11 11 11 11 11 11 11 11 10 10 10 10 11 11 10 10 9.6 11 10 10 8863 4126.3 443.6 272 RIO GRANDE DE LOIZA BASIN 50059050 RIO GRANDE DE LOIZA BELOW DAMSITE, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) APRIL 61 62 61 61 60 54 55 45 42 45 48 51 54 74 75 60 60 152 76 60 87 60 58 58 56 55 54 54 52 53 61 60 61 61 62 58 59 53 52 53 55 57 58 65 64 62 62 100 63 62 68 62 61 61 60 59 58 58 57 57 10 10 10 10 10 8 8 6 5 6 7 7 8 13 13 10 10 41 13 10 16 10 9 9 9 8 8 8 8 8 .5 .8 .4 .9 .4 .1 .8 .5 .6 .6 .1 .8 .5 .5 .0 .2 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) MAY 54 51 49 42 43 43 44 45 57 88 55 49 49 48 47 43 45 46 49 51 51 50 51 49 47 45 48 48 44 43 41 58 62 55 52 53 53 53 53 60 67 59 55 55 55 54 53 53 54 55 57 57 56 57 55 54 53 54 54 53 52 51 8. 8. 7. 5. 6. 6. 6. 6. 9. 16 8. 7. 7. 7. 6. 6. 6. 6. 7. 7. 7. 7. 7. 7. 6. 6. 7. 7. 6. 6. 5. 5 5 3 9 2 2 3 4 2 8 3 3 1 9 2 4 7 3 8 8 6 8 3 9 4 0 0 3 0 6 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) JUNE 42 42 41 38 37 37 38 42 42 40 26 11 7. 7. 8. 7. 7. 7. 7. 7. 17 8. 7. 7. 20 103 163 8. 179 149 9 2 4 8 5 2 2 7 6 6 7 2 52 52 51 50 49 49 50 52 52 51 41 28 23 22 23 23 22 22 22 22 35 24 22 23 37 76 102 23 108 99 5.9 5.9 5.6 5.1 4.9 4.9 5.1 5.9 5.9 5.5 2.9 .84 .50 .42 .52 .48 .44 .42 .42 .46 1.6 .56 .46 .48 2.0 21 45 .50 52 40 TOTAL 1843 315.7 1515 228.0 1160.0 225.70 RIO GRANDB DB LOIZA BASIN 273 50059050 RIO GRANDB DB LOIZA BELOW DAMSITB, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 DAY MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) JULY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 668 4420 254 46 133 123 1430 123 171 202 5. 185 5. 874 227 5. 114 6. 318 5. 5. 228 5. 135 83 112 7. 56 200 183 169 TOTAL 10502. YEAR e 238683. Estimated 7 5 7 6 6 4 9 8 2 8 177 423 118 54 92 87 262 87 104 112 19 108 19 203 116 19 81 21 129 19 18 115 19 93 67 83 23 60 111 107 103 --- 319 5050 81 6. 33 29 1010 29 48 61 54 479 71 25 111 71 34 15 25 9, 60 53 47 7723. 282309. .7 .30 .28 .30 .38 ,28 .26 .30 .48 .1 ,38 .56 MEAN MEAN CONCBN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) MEAN DISCHARGE (CFS) AUGUST ! 7 5 5 370 5 5 5 6 397 994 1230 45 5 4 192 6 478 7 353 371 5 213 827 9750 4600 421 406 449 19 517 550 .3 .8 .9 .7 .7 .6 .1 .2 .9 .8 .9 .7 22 19 19 142 19 19 19 20 147 214 243 53 19 18 110 21 160 23 138 142 19 113 198 467 362 151 148 156 37 165 168 142 158 574 807 6 57 207 132 142 65 442 12300 4500 172 160 189 1 230 249 .44 .30 .30 .30 .30 .28 .32 .4 .26 .24 .38 .50 .30 .9 1030 11 10 9. 9. 348 21 11 elOOO e!5 e2750 2810 715 829 943 489 831 6. 1420 64 374 24 555 6. 213 7. 418 5. 5. 5. -- 8 9 0 6 9 4 2 2 - 22254.6 20538.22 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) SEPTEMBER 219 28 26 26 26 137 37 28 215 32 300 315 182 198 210 161 198 20 261 64 143 42 253 21 113 23 152 19 19 19 14937.0 609 .84 .70 .68 .70 129 2.1 .84 581 1.3 2230 2390 351 443 535 213 444 .32 1000 11 144 2.7 379 .38 65 172 .50 > .28 .26 .26 9707.86 274 RIO GRANDE DB LOIZA BASIN 50059050 RIO GRANDE DB LOIZA BELOW DAMSITE, PR.--Continued DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) DAY MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CPS) (MG/L) (TONS/DAY) MEAN DISCHARGE (CFS) OCTOBER 1 2 3 4 S 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 356 7.0 376 1490 444 298 7.3 392 6.8 355 7.5 405 562 7.1 453 7.1 456 7.8 36 524 1280 463 401 37 418 12 430 600 1010 1280 499 142 21 144 266 155 123 22 146 34 139 22 149 169 21 157 21 158 24 48 165 249 158 148 47 152 29 153 173 216 249 162 140 .40 146 1070 186 99 .44 155 .62 133 .44 163 256 .40 192 .40 195 .50 4.7 233 861 198 160 4.7 172 .94 178 280 589 861 218 84 6 433 6 5 5 406 13 547 8 484 12 3210 865 16 737 7620 519 544 566 9 737 8 7 1100 518 102 7 325 7 - .8 .5 .3 .0 .9 .0 .8 .5 .1 .6 -- 66 21 154 21 18 18 150 31 168 25 161 29 322 202 32 186 432 164 167 170 25 187 24 22 229 165 76 21 131 22 15 .38 180 .36 .26 .24 164 1.1 248 .60 210 .94 2790 472 1.4 370 8890 230 245 260 .60 372 .58 .44 680 231 21 .40 115 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) DECEMBER 368 11 7. 7. 288 7. 396 10 7. 6. 69 330 6. 6. 7. 6, 573 10 7. 421 7. 7. 7. 566 7. 356 7. 7. 1300 1060 128 .4 ,4 ,2 ,3 ,9 .8 .9 .0 .9 , 1 . 1 .7 ,3 ,2 ,0 ,2 142 28 22 22 122 22 148 74 22 21 64 132 21 21 21 21 171 74 21 151 21 21 22 170 22 139 21 21 251 224 90 141 . 95 . 158 2. 12 118 265 2. 172 260 134 . . 881 641 31 84 44 44 42 0 44 40 38 40 40 40 0 40 40 44 86 42 40 40 TOTAL 12627.6 6498.54 18910.5 15500.76 2919.88 RIO GRANDE DE LOIZA BASIN 275 50059050 RIO GRANDE DE LOIZA BELOW DAMSITE, PR.--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN DISCHARGE DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL (CFS) 354 6. 6. 6. 121 8. 6. 308 20 7. 391 573 311 8. 7. 7. 399 8. 7. 7. 390 7. 7. 7. 170 8. 7. 7. 7. 379 7. 3563. 7 7 8 2 8 6 4 4 6 7 1 5 0 0 1 2 1 1 3 3 6 MEAN CONCEN- TRATION (MG/L) JANUARY 138 17 17 16 86 24 16 126 37 22 146 171 126 24 22 22 148 24 21 22 146 21 21 21 104 23 21 21 21 156 22 ___ SEDIMENT DISCHARGE (TONS/DAY) 132 .30 .30 .30 28 .54 .30 105 2.0 .46 154 265 106 .54 .44 .46 159 . 56 .40 .44 154 .39 .40 .40 48 .50 .40 .40 .42 160 .44 1321.39 MEAN DISCHARGE (CFS) 7. 7. 7. 7. 7. 7. 7. 234 8. 7. 7. 7. 7. 8. 446 10 2830 1550 322 5. 85 304 5. 237 5. 637 7. 5.-- -- -- 6787. 3 7 8 9 7 9 8 7 8 7 7 8 1 6 8 6 6 8 - - - 3 MEAN CONCEN- TRATION (MG/L) FEBRUARY 22 22 23 23 23 23 23 117 24 23 23 23 23 23 156 74 305 270 130 19 65 124 19 117 19 176 22 19 .._ __- --- ___ SEDIMENT DISCHARGE (TONS /DAY) .44 .46 .48 .50 .48 .50 .48 74 .56 .48 .48 .48 .48 .50 188 2.0 2330 1130 113 .28 15 102 .30 75 .28 303 .46 .30 ___ ___ --- 4339.94 MEAN DISCHARGE (CFS) 174 5. 8. 4. 146 270 7. 208 497 3760 6. 336 559 4. 253 348 7. e830 e7. e5. e4. 90 372 30 4. 234 419 4. 3. 385 285 9269. 0 1 8 1 0 9 3 3 9 9 4 0 7 4 MEAN CONCEN- TRATION (MG/L) MARCH 106 18 23 18 96 121 21 112 162 336 20 134 169 18 119 137 22 198 22 19 18 66 142 43 18 117 151 18 19 145 122 _._ SEDIMENT DISCHARGE (TONS/DAY) 50 .24 .50 .24 38 88 .40 63 217 3410 .32 122 255 .24 81 129 .44 444 .44 .30 .24 16 143 3.5 .22 74 171 .20 .18 151 94 5553.46 & Estimated 276 RIO GRANDE DE LOIZA BASIN 50059050 RIO GRANDE DE LOIZA BELOW DAMSITE, PR.--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) APRIL MAY JUNE 1 28 42 3.2 6.8 21 .38 888 204 489 2 995 214 575 6.5 21 .36 313 128 108 3 11 28 .84 6.7 21 .38 2570 310 2150 4 7.8 23 .48 150 99 40 710 182 349 5 7.2 22 .42 8.6 24 .56 8.1 23 .50 6 253 119 81 7.0 21 .40 7.7 23 .48 7 7.3 22 .44 221 113 67 7.6 22 .46 8 332 133 119 190 109 56 7.7 23 .48 9 6.6 21 .38 6.9 21 .40 8.5 24 .56 10 315 128 109 6.9 21 .40 149 97 39 11 7.2 22 .42 506 163 223 6.7 21 .38 12 5.3 18 .26 7.5 22 .44 5.8 19 .30 13 331 132 118 6.5 21 .36 5.8 19 .30 14 6.0 20 .32 6.5 21 .36 5.8 19 .30 15 269 120 87 6.6 21 .38 6.0 20 .32 16 5.3 18 .26 6.6 21 .38 6.1 20 .32 17 5.3 18 .26 6.6 21 .38 186 107 54 18 5.4 19 .28 6.6 21 .38 6.7 21 .38 19 6.3 21 .36 6.7 21 .38 5.0 18 .24 20 135 93 34 6.6 21 .38 5.0 18 .24 21 7.6 22 .46 6.6 21 .38 4.8 18 .24 22 6.8 21 .38 6.6 21 .38 4.8 18 .24 23 6.9 21 .40 6.6 21 .38 4.7 18 .22 24 6.9 21 .40 6.2 20 .34 4.5 18 .22 25 7.1 21 .40 6.5 20 .36 4.6 18 .22 26 8.3 24 .54 6.6 21 .38 6.1 20 .32 27 7.1 21 .40 7.5 22 .44 4.8 18 .24 28 6.9 21 .40 357 139 134 4.9 18 .24 29 317 129 110 6.2 20 .34 5.1 19 .26 30 7.7 23 .48 397 147 158 5.3 18 .26 31 --- --- --- 26 41 2.9 --- --- - — TOTAL 3121.0 --- 1244.78 2009.4 --- 690.22 4958.1 --- 3196.72 DAY RIO GRANDE DE LOIZA BASIN 50059050 RIO GRANDE DE LOIZA BELOW DAMSITE, PR.--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 277 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL YEAR (CPS) 5.3 10 376 5.1 754 6.8 375 407 4.9 4.8 289 6.6 16 156 7.2 7.4 7.8 11 7.9 7.4 7.5 7.5 7.9 199 7.2 7.2 8.2 8.4 25 17 13 2773.1 124304.9 (MG/L) (TONS/DAY) JULY 18 26 144 18 188 21 143 149 18 18 123 21 32 100 22 22 23 23 23 22 22 22 22 110 22 22 24 24 40 35 31 --- 146 383 145 164 96 1. 42 59 2. 1. 1. 1050. 102986. 26 70 24 38 24 24 38 4 42 44 48 68 50 44 44 44 46 42 42 54 54 7 6 1 46 77 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CPS) (MG/L) (TONS/DAY) MEAN DISCHARGE (CPS) AUGUST ! 217 61 768 7, 7, 6, 7, 6 6 6, 8, 6 6, 6 6 6. 8. 241 1450 375 8, 301 6, 704 18 345 376 6, 354 59 530 .1 .1 .8 .0 ,7 .6 .7 .1 .6 .6 .6 .6 .7 .3 .3 .1 ,5 114 61 190 21 21 21 21 21 21 21 23 21 21 21 21 21 22 116 263 143 24 123 20 180 35 136 143 21 138 62 166 67 10 394 75 1030 145 100 342 1, 127 145 132 9. 238 .40 .40 .38 .40 .38 .38 .38 .50 .38 .38 .38 .38 .38 ,52 .54 ,32 ,7 .36 ,9 3.1 868 97 95 95 94 . 94 88 88 92 412 137 347 306 96 842 821 22700 5230 851 1490 1580 2710 4570 356 1150 738 291 866 1260 ___ MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) SEPTEMBER 19 202 73 70 70 71 70 67 67 68 150 95 137 126 69 199 197 628 375 200 266 272 313 362 139 235 186 122 202 247 .16 5917.4 2823.46 48367.1 473 19 18 18 18 18 16 16 17 167 35 128 104 18 452 437 38500 5300 460 1070 1160 2290 4470 134 730 371 96 472 840 57847.16 278 RIO GRANDE DE LOIZA BASIN 50059050 RIO GRANDE DE LOIZA BELOW DAMSITE, PR.--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) NOVEMBER MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/ DAY) OCTOBER 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 448 672 54 941 303 46 419 62 917 512 64 64 67 68 348 73 54 50 59 51 197 55 224 48 65 79 85 76 263 67 63 156 178 58 210 125 54 146 60 207 164 66 64 61 65 137 66 58 56 62 57 109 59 114 55 63 66 65 63 120 61 65 189 323 8. 534 102 6. 165 10 509 227 11 11 11 12 129 13 8. 7, 9, 7, 58 8, 69 7. 11 14 15 13 85 11 11 .5 .7 .5 .6 .9 .8 .8 .1 60 63 65 63 357 61 60 60 327 77 62 59 58 60 81 89 83 75 70 69 65 68 67 76 86 82 82 81 78 75 62 65 63 65 139 61 62 62 131 63 60 61 61 62 64 67 67 64 63 64 63 65 60 63 64 63 63 64 66 64 10 11 11 11 134 10 10 10 116 13 10 9.7 9.6 10 14 16 15 13 12 12 11 12 11 13 15 14 14 14 14 13 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) DECEMBER 73 72 70 67 63 63 61 58 55 49 48 49 39 11 11 11 10 9. 9. 9. 8. 8. 8. 7. 7. 7. 6. 7. 12 7. 8. 9 ,5 .3 .8 ,5 ,1 , 9 ,5 .2 .9 ,5 ,7 1 66 62 63 61 65 65 61 61 59 55 55 55 50 28 28 28 26 26 25 25 24 24 23 23 22 22 21 22 29 23 23 13 12 12 11 11 11 10 9. 8. 7. 7. 7. 5. 6 8 3 1 3 3 84 84 84 70 70 64 62 58 56 50 50 44 42 40 44 94 48 50 6494 2597.9 2659 588.3 928.9 136.34 RIO GRANDE DE LOIZA BASIN 50059050 RIO GRANDE DE LOIZA BELOW DAMSITE, PR.--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 279 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 JANUARY 8 7 6 6 S 5 5 5 S S 4 4 4 4 4 4 4 4 4 5 4 4 4 5 4 4 4 4 4 4 4 .3 .3 .5 .1 .6 .6 .6 .4 .0 .0 .9 .3 .0 .6 .6 .2 .3 .4 .7 .1 .2 .0 .9 .6 . 6 .5 .5 .7 .8 .8 .5 24 23 21 20 19 • 19 19 19 18 18 17 18 19 18 18 18 18 18 18 18 19 19 19 19 18 18 18 18 18 18 18 ,54 .46 ,36 ,32 ,28 ,28 ,28 ,28 ,24 .24 .22 ,20 .20 ,22 .22 ,20 ,20 .22 .22 .24 .22 .20 .26 .28 .22 ,22 .22 .22 .24 .24 .22 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CPS) (MG/L) (TONS/DAY) FEBRUARY .22 .22 .24 .26 .24 .22 .24 .22 .21 .20 .20 .20 .24 .20 .20 .22 .26 .32 .20 .20 .22 .20 .22 .22 .22 .22 .22 4 4 4 4 5 5 4 4 4 4 4 3 3 4 4 4 4 5 6 4 4 4 4 4 4 4 4 4 .5 .5 .5 .9 .4 .1 .5 .9 .1 .2 .0 .9 .8 .8 .0 .1 .2 .3 .1 .3 .3 .6 .3 .2 .4 .5 .5 .7 18 18 18 18 18 18 18 18 19 19 19 19 19 18 19 18 19 18 20 18 18 18 18 19 19 18 18 18 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) MARCH s s 4 8 10 20 8 5 8 6 6 6 6 6 6 6 6 6 7 6 5 S 4 4 0 5 5 4 3 7 8 8 S 8 4 3 9 3 8 4 3 4 3 3 4 7 7 2 4 2 0 8 8 18 18 18 52 18 18 18 18 18 18 24 26 37 24 19 23 21 20 20 20 20 20 20 21 21 22 20 18 18 18 18 .24 .22 .22 .62 .20 .22 .24 .24 .26 .24 .54 .70 1.0 .54 .30 .52 .38 .34 .34 .34 .34 .34 .34 .38 .38 .42 .34 .26 .24 .24 .24 TOTAL 156.6 7.96 126.6 6.25 199.9 12.22 280 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 RIO GRANDE DB LOIZA BASIN 50059050 RIO GRANDS DB LOIZA BELOW DAMSITE, PR.--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) JUNE MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) 4.8 4.7 4.8 4. 8 4.8 4.8 4.8 5.0 5.4 5.4 5.3 5.3 5.3 6.8 5.8 5.6 5.7 6.0 5.8 6.6 6.2 6.7 6.9 6.9 13 6.9 6.4 6.0 5.9 5.9 --- APRIL 18 17 18 18 18 18 18 18 19 19 18 18 18 21 19 18 19 20 19 21 20 21 21 21 31 21 20 20 19 19 --- MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) MAY .24 .22 .24 .24 .24 .24 .24 .24 .28 .28 .26 .26 .26 .38 .30 .28 .30 .32 .30 .38 .34 .38 .40 .40 1. 1 .40 .34 .32 .30 .30 --- 8 10 10 10 9 9 8 7 31 7 6 5 6 7 6 5 6 5 5 5 5 5 5 5 5 5 5 5 5 5 5 .1 .7 .4 .4 .4 .3 .2 .5 .4 .2 .1 .9 .0 .9 .9 .9 .8 .8 .9 .9 .8 .9 .9 .7 .7 .7 .8 25 26 26 26 26 23 24 22 44 22 20 19 20 22 20 19 20 19 19 19 19 19 19 19 19 19 19 19 19 19 19 .53 .70 .70 .70 .68 .58 .54 .44 3.7 .44 .34 .28 .34 .42 .32 .30 .32 .30 .30 .30 .30 .30 .30 .30 .30 .30 .30 .30 .30 .30 .30 6. 6. 6. 7. 6. 6. 5. 5. 5. 4. 4. 4. 4. 5. 5. 5. 4. 4. 4. 4. 27 7. 5. 53 406 112 6. 5. 4. 4. 3 2 9 0 7 0 9 7 4 7 9 6 6 7 6 1 8 6 8 8 9 9 4 0 7 4 20 20 21 21 21 20 19 19 19 18 18 18 18 19 19 18 18 18 18 18 41 23 19 57 150 83 19 18 18 19 .34 .34 .40 .40 .38 .32 .30 .30 .28 .22 .24 .22 .22 .30 .28 .24 .24 .22 .24 .24 3.0 .50 .30 8.2 164 25 .32 .24 .22 .22 TOTAL 178.3 9.78 236.2 15.53 742. 6 207.72 RIO GRANDE DB LOIZA BASIN 281 50059050 RIO GRANDE DE LOIZA BELOW DAMSITE, PR.--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) AUGUST MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL YEAR 4 4 3 3 3 172 3 3 179 5 4 5 4 4 3 3 4 3 122 3 3 4 4 164 610 434 5 5 6 6 7 1795 16235 .2 .0 .9 .8 .7 .7 .9 .6 .2 .0 .8 .3 .7 .8 .0 .9 .5 .8 .0 .5 .7 . 9 .2 .8 .5 .4 .6 JULY 19 19 19 19 20 106 20 19 105 19 19 18 18 18 20 19 18 19 88 21 19 18 18 103 174 154 18 19 20 20 22 ... .22 .20 .20 .20 .20 49 .20 .20 51 .28 .22 .24 .24 .20 .20 .20 .20 .20 29 .20 .20 .20 .22 46 287 180 .28 .30 .34 .36 .44 647.94 5122.28 MEAN DISCHARGE (CFS) 8 9 9 11 12 13 14 164 193 641 233 9 215 219 5 4 4 4 4 4 4 8 4 4 4 3 3, 3, 3 3, 2, 1827, .3 .4 .9 .8 .1 .8 .8 .9 .8 .9 .8 .2 .4 .1 .0 ,8 .6 .6 ,3 .3 .8 .6 8 9 9 11 12 13 14 164 193 641 233 9, 215 219 5 4 4, 4. 4 , 4 , 4 8, 4, 4 , 4, 3, 3, 3, 3 , 3, 2, .3 .4 .9 .8 .1 .8 .8 .9 .8 .9 .8 .2 .4 .1 .0 ,8 .6 ,6 ,3 ,3 .8 24 25 26 28 29 31 31 103 109 176 116 25 107 113 18 18 18 18 18 18 18 22 18 18 19 19 21 21 11 11 13 .54 .64 .70 .84 .94 1.1 1.2 46 57 305 73 .66 62 67 .24 .22 .22 .22 .22 .22 .20 .44 .22 .20 .20 .20 .20 .20 .10 .10 .10 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) SEPTEMBER 2 2 314 4 2 2 2 2 2 2 2 2 4 3 3 3 248 2 2 2 2 2 2 2 2 2 258 2 2 2 .5 .3 .4 .9 .3 .3 .6 .3 .3 .4 .5 . 1 .4 . 1 .3 .2 .2 .2 .2 .1 .1 .4 .3 .3 .8 .3 .7 15 16 127 19 13 16 16 14 16 16 15 15 18 22 24 22 117 17 17 17 17 18 18 15 16 16 119 13 16 13 .10 .10 108 .22 .10 .10 .10 .10 .10 .10 .10 .10 .20 .20 .20 .20 78 .10 .10 .10 .10 .10 .10 .10 .10 .10 83 .10 .10 .10 620.12 890.5 272.22 282 RIO GRANDE DB LOIZA BASIN 50059050 RIO GRANDE DE LOIZA BELOW DAMSITE—Continued SILT AND CLAY PERCENT OF SUSPENDED SEDIMENT MAY 1990 05.. . JUL 25.. . AUG 08.. . 10.. . 10.. . 10.. . 10.. . 10.. . 10.. . 10.. . TIME 1354 1020 1530 1440 1444 1457 1502 1507 1509 1513 STREAM- FLOW, INSTAN- TANEOUS (CFS) 22 671 565 2400 2400 2400 1590 1590 1590 1590 SEDI- MENT, SUS- PENDED (MG/L) 146 759 1520 815 812 770 756 739 732 722 SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) 8.7 1375 2319 5281 5262 4990 3245 3172 4423 3099 SBD. SUSP. SIEVE DIAM. PERCENT FINER THAN .062 MM 96 98 99 94 95 95 94 95 96 96 RIO QRANDB DE LOIZA BASIN 283 50059100 RIO GRANDE DE LOIZA BELOW TRUJILLO ALTO, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°21'35", long 66°00'15", 100 ft (30 m) downstream of Highway 181 bridge, 0.4 mi (0.6 km) northwest of Trujillo Alto plaza, and 2.2 mi (3.5 km) northeast of Lago Loiza Reservoir. DRAINAGE AREA.--213 mi a (552 km a ) . PERIOD OP RECORD.—Water years 1981 to current year. REMARKS: Plow controlled by Lago Loiza reservoir. WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 13. .. DEC 15. . . PEB 1990 14. .. APR 26. . . JUN 04. . . AUG 20. . . TIME 1010 1010 1045 1115 1140 0935 DIS- CHARGE, INST. CUBIC PEET PER SECOND 60 12 10 9.6 11 7.6 SPE- CIFIC CON- DUCT- ANCE (US/CM) 262 402 397 380 380 346 PH (STAND- ARD UNITS) 7.40 7.70 7.40 7.50 7.30 8.30 TEMPER- ATURE WATER (DEG C) 26.5 26.0 23.5 27 .5 29.5 30.0 TUR- BID- ITY (NTU) 12 1.3 42 22 30 1.4 OXYGEN, DIS- SOLVED (MG/L) 7.2 9.1 7. 6 7.5 7.4 8.6 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 89 110 88 94 95 112 OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 27 20 28 35 23 20 COLI- FORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) 330 K130 31000 2200 34000 50 STREP- TOCOCCI FECAL, KP AGAR (COLS. PER 100 ML) K150 K150 34000 K1500 K5000 K10 OCT 1989 13. .. DEC 15. . . PEB 1990 14. .. APR 26. . . JUN 04. .. AUG 20. . . HARD- NESS TOTAL (MG/L AS HARD- NESS NONCARB WH WAT TOT PLD MG/L AS CALCIUM DIS- SOLVED (MG/L MAGNE- SIUM, DIS- SOLVED (MG/L SODIUM, DIS- SOLVED (MG/L SODIUM AD- SORP- TION RATIO CACO3) CACO3 88 120 120 AS CA) AS MG) AS NA) 1.6 19 30 12 29 11 26 27 ALKA- POTAS- LINITY CHLO- SIUM, WAT WH SULPATE RIDE, DIS- TOT PET SULPIDE DIS- DIS- SOLVED PIELD TOTAL SOLVED SOLVED (MG/L MG/L AS (MG/L (MG/L (MG/L AS K) 0.9 5.8 1 2.8 1 3.1 CACO3 87 140 140 140 130 120 AS S) AS S04) AS CL) <0.5 14 <0.5 19 18 18 27 28 DATE OCT 1989 13.. . DEC 15.. . PEB 1990 14.. . APR 26.. . JUN 04.. . AUG 20.. . SOLIDS, PLUO- SILICA, SUM OF RIDE, DIS- CONSTI- DIS- SOLVED TUENTS, SOLVED (MG/L DIS- (MG/L AS SOLVED AS P) SIO2) (MG/L) 0.10 22 161 __ __ 0.20 26 219 __ <0.10 27 215 RESIDUE SOLIDS, TOTAL NITRO- DIS- AT 105 GEN, SOLVED DEG. C, NITRATE (TONS SUS- TOTAL PER PENDED (MG/L DAY) (MG/L) AS <1 0 <1 0 74 0 5.32 8 0 31 0 4.49 <1 0 N) .76 .59 .83 .47 .36 .29 NITRO- GEN, NITRITE TOTAL (MG/L AS 0 0 0 0 0 0 N) .04 .01 .07 .03 .04 .01 NITRO- GEN, NO2+NO3 TOTAL (MG/L AS 0 0 0 0 0 0 N) .80 .60 .90 .50 .40 .30 NITRO- GEN, AMMONIA TOTAL (MG/L AS 0, 0, 0, 0, 0, 0, N) ,03 ,04 ,14 ,06 ,08 ,09 NITRO- GEN, ORGANIC TOTAL (MG/L AS N) 0 0 0 0 0 1 .47 .16 .56 .64 .42 .9 K = non-ideal count 284 RIO GRANDE DE LOIZA BASIN 50059100 RIO GRANDE DE LOIZA BELOW TRUJILLO ALTO, PR—Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 13.. . DEC 15.. . PEB 1990 14.. . APR 26.. . JDN 04.. . ADG 20. . . OCT 1989 13.. . DEC 15.. . FEB 1990 14.. . APR 26.. . JUN 04.. . ADG 20.. . NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.50 0.20 0.70 0.70 0.50 2.0 IRON, TOTAL RECOV- ERABLE (UG/L AS FE) NITRO- GEN, TOTAL (MG/L AS N) 1.3 0.80 1.6 1.2 0.90 2.3 LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) NITRO- GEN, TOTAL (MG/L AS NO3) 5.8 3.5 7.1 5.3 4.0 10 MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MM) PHOS- PHORUS TOTAL (MG/L AS P) 0.17 0.19 0.30 0.21 0.26 0.19 MERCURY TOTAL RECOV- ERABLE (UG/L AS HG) ARSENIC TOTAL (UG/L AS AS) <1 -- -- 1 -- -- SELE- NIUM, TOTAL (UG/L AS SB) BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 -- -- <100 -- -- SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) BORON, TOTAL RECOV- ERABLE (UG/L AS B) 20 -- -- 20 -- -- ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 — -- <1 — -- CYANIDE TOTAL (MG/L AS CN) CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) 1 -- -- 3 -- -- PHENOLS TOTAL (UG/L) COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) 10 — — 20 -- -- METHY- LENE BLUE ACTIVE SUB- STANCE (MG/L) 840 2800 18 60 240 <0.10 <1 <1 <1 20 <0.010 <0.010 <1 0.05 0.04 RIO GRANDB DB LOIZA BASIN 50061800 RIO CANOVANAS NEAR CAMPO RICO, PR 285 LOCATION.--Lat 18°19'08", long 65°53'21", Hydrologic Dnit 21010005, at center pier on downstream side of bridge, on paved secondary road, 0.4 mi (0.6 km) northeast of junction of Highways 185 and 186, 1.5 mi (2.4 km) south of Campo Rico, and 4.4 mi (7.1 km) south of Loiza. DRAINAGE AREA.--9.84 mi' (25.48 km2 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--March 1967 to current year. GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 225 ft (68 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. AVERAGE DISCHARGE.--23 years (1968-90), 28.4 ft3 /s (0.804 m3 /s) , 39.19 in/yr (995 mm/yr), 20,580 acre-ft/yr (25.4 hmVyr); median of yearly mean discharges, 27 ftVs (0.76 m3 /s), 19,600 acre-ft/yr (24 hmVyr) . EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 15,000 ft'/s (425 m3/s). Sept. 13, 1982, gage height, 13.1 ft (3.99 m), from floodmarks, from rating curve extended above 350 ft3 /s (9.91 m'/s) on basis of slope-area measurements and step- backwater analysis made in 1981; minimum daily discharge, 0.80 ft3 /s (0.023 m3 /s), July 24, 1977. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 2,500 ft3 /s (70.8 m3/s) and maximum (*): Discharge (ftVs) (m3/s) Gage height (ft) (m) Date Time Aug. 13 unknown *1,760 49.8 *7.52 2.292 Minimum discharge, 5.3 ft3 /s (0.150 m3 /s), June 14. Discharge Time (ft3/s) (m3/s) Gage height (ft) (m) DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES OCT NOV DEC JAN FEB MAR APR JUN AUG SEP 1 32 2 28 3 26 4 54 5 36 6 24 7 23 8 43 9 42 10 24 11 21 12 19 13 19 14 28 15 48 16 29 17 21 18 19 19 17 20 17 21 102 22 33 23 31 24 26 25 31 26 24 27 19 28 18 29 25 30 19 31 17 TOTAL 915 MEAN 29.5 MAX 102 MIN 17 AC- FT 1810 CFSM 3.00 IN. 3.46 CAL YR 1989 WTR YR 1990 23 18 16 21 37 30 49 29 26 20 18 17 27 26 20 20 19 17 18 17 16 15 e!5 e!5 e!4 e!4 e!4 e!3 e!3 e!3 --- 610 20.3 49 13 1210 2.07 2.31 TOTAL 9405 TOTAL 6564 e!3 e!2 e!2 e!2 e!2 e!2 ell ell ell ell ell ell elO elO elO elO elO ell ell ell elO elO elO e9.5 e9.5 e9.5 e9.0 e!2 e25 e!3 e23 362.5 11.7 25 9.0 719 1.19 1.37 .4 MEAN .9 MEAN e35 e50 e25 e!5 elO e9.0 e8.0 e7.5 e7.0 e7.5 e9.0 e6.5 6.0 5.9 6.1 6.8 10 8.5 9.2 19 13 8.6 8.1 10 9.1 8.9 8.7 8.6 10 9. 1 7.5 362.6 11.7 50 5.9 719 1.19 1.37 25.8 MAX 18 . 0 MAX 7.9 7.9 7.6 7.6 7.9 6.7 6.9 9.2 14 15 9.2 7.9 7.2 33 14 10 9.5 13 15 11 10 15 16 17 13 12 11 11___ ___ --- 325.5 11.6 33 6.7 646 1.18 1.23 1140 150 29 19 12 10 9.2 8.9 8.9 8.7 39 27 130 126 132 113 43 34 32 26 21 19 17 15 15 14 16 16 21 17 17 14 13 1022.7 33.0 132 8.7 2030 3.35 3.87 12 11 11 11 11 10 10 10 9.8 10 9.2 8.9 9.5 10 9.5 9.2 8.7 8.4 9.8 11 11 9.2 7.9 7.9 125 41 17 13 12 11--- 455.0 15.2 125 7.9 902 1.54 1.72 MIN 4.8 AC-FT 18660 MIN 5.6 AC-FT 13020 11 11 10 10 9.5 9.2 9.2 8.7 8.9 13 15 9.4 9.7 14 13 10 9.9 9.3 8.2 7.5 7.6 7.7 6.8 6.7 6.9 7.1 7.1 7.2 6.8 6.4 6.9 283.7 9.15 15 6.4 563 .93 1.07 CFSM 2 CFSM 1 7.1 7.2 6.8 7.4 7.6 13 8.4 6.5 6.1 6.1 7.1 5.9 5.6 46 42 12 9.7 11 9.1 25 12 8.0 7.2 28 54 18 10 8.5 7.9 7.3 --- 410.5 13.7 54 5.6 814 1.39 1.55 .62 IN. .83 IN. 8.4 8.0 7.2 6.9 6.7 18 30 11 8.3 7.9 7.1 7.1 6.7 7.1 11 9.6 12 75 39 13 9.6 8.6 9.5 66 45 18 14 11 9.5 10 10 511.2 16.5 75 6.7 1010 1.68 1.93 35.56 24.82 10 11 13 10 16 16 e20 e25 e!5 e35 e!5 e20 e!50 e35 e25 e20 e!7 e20 e!5 e!4 e!2 e25 e20 e!5 e20 e!5 e!3 ell ell 13 10 667 21.5 150 10 1320 2.19 2.52 9.8 11 13 12 8.9 8.7 8.8 8.8 15 22 11 13 17 14 21 13 13 16 16 12 9.5 8.4 26 128 76 22 13 11 9.3 72--- 639.2 21.3 128 8.4 1270 -2.17 2.42 e Estimated 286 RIO GRANDE DE LOIZA BASIN 50061800 RIO CANOVANAS NEAR CAMPO RICO, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS AUGUST 1981 TO CURRENT YEAR SPECIFIC CON- TEMPERA- DUCTANCE TURE (UHHOS) (DBG C) DATE TIME OCT. 05 1428 NOV. 17 1020 DEC. 19 1437 JAN. 16 0957 FEB. 31 1258 MAR. 21 1042 STREAMFLOW, INSTANTANEOUS (CFS) 28.8 17.1 10.6 6.74 7.36 17.4 159 219 238 234 226 178 27.0 24 .0 27.0 22 .5 25.0 23.5 DATE TIME APR. 16 0954 MAY 10 1130 JUNE 21 1041 JULY 19 0913 AUG. 29 1450 SEPT 19 1421 STREAMFLOW, INSTANTANEOUS (CFS) 9.31 8.80 13.1 36.8 10.3 13.5 SPECIFIC CON- TEMPERA- DUCT ANCE (UMHOS) 224 225 125 100 196 174 TURE (DEG C) 24.0 27.5 27.0 23.5 24.0 30.0 287 \ 0 C E A N Q L A N 7 i C C "*-> /,~j A , J: ~t W / / i /-V/...J-—~\ ( - ~-~- ~. \ ! ./ -/- 3v_x ,-,! 1 - \ ?.- 0750 ,, •'--•-••• V^.,^ ^ •<_-._ - ^ > \ ^ , r, ~>-TA i l'.^-^^ /.- ^i / P. '" ——- .^C v"> ' -v- ••<", •/ li~""—' \ x^i / v-. —v--- V"""--r ^- CEIBA \ ^9 '--"\ —' f>. .-"" N-^=^ \ '-./ ,_„ ,, -! V..---:;--'i" .—N^ X K- j {-, ^X \ \ s i ~—-'~v> r / K^ v v ' i /^ U--- \ , \ \ ^ ^ - ,- sX , ^ x ^ ^ , , . x , \ -«i i .-• ^ -, ,- : ">V y ' \ i ^ \ \ fl i \ l'\\\«-^. ^ ^Yv-vrt- \ / c A 1 - ' tN ^--'i \ ^7/ J ^«n - Xv-- K L- \ ; ^ V- x :' ,-rvn A x-v. ~v^. ^>A iS^ ; /y \v\ if/ ^ r N, v } r^ Or V / 4 5 SKILOMtUftS- EXPLANATION SURFACE-WATER STATION AND NUMBER QUALITY-OF-WATER STATION AND NUMBER Figure 20.--Northeastern river basins the Rio Herrera to Rio Anton Ruiz basins. 288 RIO ESPIRITD SANTO BASIN 50063440 QUEBRADA SONADORA NEAR EL VERDE, PR LOCATION.--Lat 18°19'24", long 65°49'03", Hydrologic Unit 21010005, in Caribbean National Forest, at El Yungue, 0.6 mi (1.0 km) upstream from Rio Espiritu Santo, 0.2 mi (0.3 km) upstream from Highway 186, and about 1.2 mi (1.9 km) south of El Verde. DRAINAGE AREA.--1.01 mi 1 (2.62 km 1 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--March 1983 to current year. GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 1,230 ft (375 m), from topographic map. REMARKS.--Records poor. AVERAGE DISCHARGE.--? years (1984-90), 7.50 ft3/s (0.212 m3/s), 100.8 in/yr (2,560 mm/yr), 5,430 acre-ft/yr (6.70 hmVyr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 2,230 ft3 /s (63.2 m3/s), Dec. 7, 1987, gage height, 9.42 ft (2.871 m) from rating curve extended above 20 ft3/s (0.57 m3 /s) on basis of step-backwater analysis; minimum discharge, 0.13 ft3 /s (0.004 m3/s), May 26, 1989. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 500 ft3 /s (14.2 mVs) and maximum (*)s Date Apr. 25 May 10 Tir 1130 1515 Discharge (ft3 /s) (m3 /s) Gage height (ft) (m) 678 586 19.2 16.6 7.48 7.28 2.280 2.219 Date Aug. 13 Discharge Time (ft3 /s) (m3 /s) 1515 »786 22.2 Gage height (ft) (m) *7.69 2.344 Minimum daily discharge, 0.20 ft3 /s (0.006 m3 /s), Dec. 17, 23-28. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES DAY NOV JAN MAR APR JUN JUL SEP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC-FT CFSM IN. CAL YR WTR YR 3.1 2.8 2.4 2.9 2.4 1.9 1.7 2.1 2.1 1.5 1.4 1.3 1.3 2.6 14 2.0 1.5 1.3 1.2 1.2 2.0 21 2.6 1.5 4.9 2.1 1.4 1.5 1.2 6.0 2.4 97.3 3.14 21 1.2 193 3.11 3.58 1989 1990 9.7 1.9 2.2 9.3 22 6.8 12 11 15 4.2 4.5 3.1 14 7.8 8.6 4.9 3.6 2.8 3.0 2.2 1.7 1.5 1.3 1.2 1.1 1.1 1.0 .94 .84 .78 --- 160.06 5.34 22 .78 317 5.28 5.90 TOTAL 2436, TOTAL 2436. .73 .68 .65 .61 .54 .50 .47 .43 .40 .35 .32 .29 .28 .26 .25 .24 .20 .22 .22 .23 .22 .21 .20 .20 .20 .20 .20 .20 15 1.7 3.3 29.50 .95 15 .20 59 .94 1.09 ,23 MEAN ,50 MEAN 14 19 5.4 3.8 1.8 1.4 1.4 1.6 1.3 1.3 2.6 2. 6 1.5 2.7 3.1 12 18 19 16 29 5.8 3.6 12 19 23 12 8.7 4.8 11 4.3 3.2 264.9 8.55 29 1.3 525 8.46 9.76 6.67 MAX 6.68 MAX 4.3 3.3 3.0 2.6 2.1 1.9 4.3 20 24 6.3 8.6 3.2 2.3 48 5.3 3.9 8.8 13 15 5.9 15 20 13 11 5.5 10 5.6 8.4 __- ___ --- 274.3 9.80 48 1.9 544 9.70 10.10 192 MIN 91 MIN 24 5.9 3.9 3.3 2.8 2.9 2.6 2.1 28 18 61 84 91 34 7.0 19 7.7 4.7 3.3 2.9 2.5 2.4 2.4 2.1 4.3 4.5 8.9 6.9 7.2 3.6 2.7 2.3 4.6 2.8 2.2 2.0 1.7 1.6 1.6 1.5 3.3 1.7 1.5 5.8 3.9 2.3 12 2.5 2.1 5.6 16 3.2 2.3 1.9 1.8 91 9.2 4.9 3.2 2.6 2.3 --- 455.6 199.4 14.7 91 2.1 904 14.6 16.78 .14 AC-FT .20 AC-FT 6. 65 91 1.5 396 6.58 7.34 4830 4830 3.5 4.5 2.6 2.5 2.1 1.5 1.3 1.2 15 65 6.1 2.4 22 23 14 4.8 8.8 11 2.3 1.7 1.4 1.1 .90 .78 .70 12 3.2 1.6 1.0 .72 4.5 223.20 7.20 65 .70 443 7.13 8.22 CFSM 6. CFSM 6. 5.8 12 16 6.0 19 13 5.7 3.1 11 31 4.1 1.6 1.1 1.1 2.4 1.3 .66 .77 6.4 31 2.2 .91 1.6 3.5 20 20 3.5 1. 1 .72 .58 --- 227.14 7.57 31 .58 451 7.50 8.37 61 IN. 89 61 IN. 89 4.6 .83 .47 .37 .32 43 4.3 1.5 1.5 2.3 1.1 1.0 .71 7.4 9.0 1.7 6.5 5.7 7.1 1.7 1.0 .79 5.1 33 22 5.4 3.5 1.7 1.1 .86 .70 176.25 5.69 43 .32 350 5.63 6.49 .73 .74 .82 12 3.3 .84 .63 .57 25 13 2.2 24 5.5 6.5 67 9.0 5.9 3.2 2.5 4.5 2.5 2. 1 1.6 5. 1 7.5 2.0 2.3 1.7 1.0 .77 .64 .59 .55 214.81 6.93 67 .55 426 6.86 7.91 .54 3.6 11 1.3 .58 .53 .52 .50 .52 .55 .48 12 12 13 1.9 9.1 5.3 4.6 1.6 4.8 .93 1.3 1.3 2.9 .85 .56 .61 .64 .53 20--- 114.04 3.80 20 .48 226 3.76 4.20 RIO ESPIRITU SANTO BASIN 289 50063440 QDEBRADA SONADORA NEAR EL VERDE, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS APRIL 1983 TO CURRENT YEAR SPECIFIC CON- TEMPERA- DUCTANCE TURE (UHHOS) (DEC C) DATE TIME OCT. 05 0936 NOV. 16 1235 DEC. 19 1016 JAN. 16 1306 FEB. 01 1210 MAR. 21 1332 STREAMFLOW, INSTANTANEOUS (CFS) 2.30 3.85 3.20 4.09 4.66 2.52 62 61 62 63 56 56 22.0 22.0 23.0 20.5 20.5 21.5 DATE TIME APR. 19 1242 MAY 09 0946 JUNE 21 1322 JULY 18 1238 AUG. 29 1030 SEPT 19 0947 STREAMFLOW, INSTANTANEOUS (CFS) 11.6 1.02 2.44 3.00 4.36 1.55 SPECIFIC CON- TEMPERA- DUCTANCE TURE (UMHOS) (DEC C) 61 66 45 52 57 54 22.0 22.5 23.5 23.0 19.0 23.0 290 RIO BSPIRITU SANTO BASIN 50063500 QUBBRADA TORONJA AT EL VERDE, PR LOCATION.--Lat 18°19'43", long 65°49'14", Hydrologic Unit 21010005, in Caribbean National Forest, at downstream side of culvert on Highway 186, 0.2 mi (0.3 km) upstream from Rio Bspiritu Santo, and about 0.9 mi (1.4 km) south of El Verde. DRAINAGE AREA.--0.064 mi* (0.166 km 3 ). WATER-DISCHARGE RECORDS PERIOD OP RECORD.--April 1983 to current year. GAGE.—Water-stage recorder and concrete broad-V-notch crested weir. Elevation of gage is 876 ft (267 m), from topographic map. REMARKS.--Records fair. AVERAGE DISCHARGE.--? years (1984-90), 0.33 ft3/s (0.009 m3/s), 70.02 in/yr (1,778 mm/yr), 239 acre-ft/yr (0.295 hmVyr) . EXTREMES FOR PERIOD OP RECORD.--Maximum discharge, 101 ft3/s (2.86 mVs), Aug. 13, 1990, gage height, 2.61 ft (0.796 m), from rating curve extended above 1.0 ft3/s (0.03 m3/s) on basis of step-backwater analysis; minimum discharge, no flow for part of each day Apr. 10, 17, 1983. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 13 ft3/s (0.37 m3/s) and maximum (*}: Discharge Time (ft3 /s) (m3 /s) Gage height (ft) (m) Date Discharge Time (ft 3 /s) (m3 /s) Gage height (ft) (m) Date Aug. 13 1445 *101 2.86 *2.61 0.796 No other peak greater than base discharge. Minimum discharge, 0.05 ft 3 /s (0.001 m3 /s), Dec. 21-28,31, Jan. 7-15. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES OCT NOV JAN MAY JUL AUG SEP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC- FT CFSM IN. CAL YR WTR YR .28 .23 .20 .19 .17 .15 .15 .15 .13 .12 .12 .12 . 11 .20 .28 .13 . 11 .09 .09 .09 .11 .59 .15 .12 . 11 .11 .12 . 11 .16 .28 .14 5.11 .16 .59 .09 10 2.75 3.17 1989 1990 .22 .13 .13 .26 .51 .27 .42 .26 .44 .25 .26 .19 .26 .33 .30 .24 .21 .18 .18 .16 .15 .15 .13 .13 .12 .12 .12 .11 .10 .09 --- 6.42 .21 .51 .09 13 3.57 3.98 TOTAL 100.51 TOTAL 99.41 .09 .09 .12 .11 . 11 . 10 .09 .09 .09 .09 .09 .08 .08 .07 .07 .07 .07 . 08 .08 .07 .07 .06 .06 .05 .05 .05 . 05 .06 .45 .08 .11 2. 83 .091 .45 .05 5.6 1.52 1.75 MEAN MEAN .34 .49 .21 .09 .07 .07 .07 .06 .06 .06 .06 .06 .05 .06 .07 .10 .18 .42 .28 .94 .23 .16 .53 .49 .57 .35 .31 .23 .29 .20 .18 7 .28 .23 .94 .05 14 3.91 4.51 .28 MAX 4 , .27 MAX 3, .24 .17 .18 .16 .14 .13 .16 .25 .32 .19 .17 .14 .13 1.2 .24 .20 .30 .33 .46 .25 .40 .49 .37 .42 .23 .21 .17 .22 ___ ___ --- 7.87 .28 1.2 .13 16 4.68 4.88 . 0 MIN .8 MIN .78 .24 .20 .17 .15 .17 .14 .13 .28 .18 1.7 2.8 3.8 2.0 .90 .98 .60 .45 .35 .30 .24 .23 .21 .18 .21 .44 .43 .32 .62 .25 .22 19.67 .63 3.8 .13 39 10.6 12.20 .05 AC-FT .05 AC-FT .20 .19 .18 .16 . 18 .18 .16 .16 .15 .15 1 . 14 .12 .16 . 15 1 .15 .25 .15 .15 .17 .24 .16 .14 .12 .18 2.4 .47 .27 .21 .19 .18 --- 7.71 10 .26 2 .4 .12 15 4.28 5 4.78 6 199 CFSM 4 197 CFSM 4 .21 .19 .16 .17 .15 .14 .13 .13 .42 .3 .38 .24 .84 .2 .51 .34 .43 .65 .29 .27 .24 .22 .20 .20 .18 .21 .18 .17 .15 .15 .15 .20 .33 1.3 .13 20 .48 .32 .59 .54 .15 .20 .24 .21 .38 .47 .29 . 19 .57 .80 .33 .20 .17 .18 .18 .15 . 14 . 14 .15 .76 .23 .16 . 19 .21 1.1 .92 .32 .21 .16 .15 --- 9.55 .32 1.1 .14 19 5.31 5. 92 IN. 62.32 IN. 61.63 .22 .14 .12 .12 .12 1.2 .23 .17 .15 .14 .12 .09 .09 .13 .17 .10 .18 .18 .15 .10 .09 .08 .20 1.2 1.1 .26 .17 .15 .13 .12 .11 7.53 .24 1.2 .08 15 4.05 4.67 .12 .22 .13 .09 .09 .09 .74 .50 .17 .48 .20 .19 2.9 .79 .44 .34 .28 .28 .22 .19 .18 . 16 .16 . 14 . 18 .14 .12 .12 . 10 .09 .09 9.94 .32 2.9 .09 20 5.34 6.16 .10 .23 .31 .14 .12 .11 .12 .11 .12 .12 .12 .35 .26 .26 .15 .24 .24 .21 .16 .18 .15 .16 .15 .22 .16 .12 .17 .13 .11 .28 --- 5.30 .18 .35 .10 11 2.94 3.29 RIO ESPIRITU SANTO BASIN 50063500 QUEBRADA TORONJA AT EL VERDE, PR—Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS APRIL 1983 TO CURRENT YEAR STREAMFLOW, TIME INSTANTANEOUS (CFS) SPECIFIC CON- TEMPERA- DUCTANCE TURE (UMHOS) (DEC C) OCT. NOV. DEC. JAN. FEB. 05 1125 16 1424 19 1107 16 1438 01 1312 MAR. 21 1452 0.17 0.17 0.11 0.08 0.17 0.23 105 112 116 122 107 102 24.0 23, 22, 22, 22, DATE TIME MAY 09 1104 JULY 18 1404 AUG. 29 0900 SEPT 19 1049 STREAMFLOW, INSTANTANEOUS (CFS) 0.11 0.22 0.13 0.13 291 SPECIFIC CON- TEMPERA- DDCTANCE TURE (UMHOS) (DEC C) 117 102 113 116 23.0 24.5 21.0 24.0 23.5 292 RI° ESPIRITU SANTO BASIN 50063800 RIO ESPIRITU SANTO NEAR RIO GRANDE, PR LOCATION.--Lat 18°21'37", long 65°48'49", Hydrologic Onit 21010005, at left abutment, on downstream side of bridge on Highway 966, 0.1 mi (0.2 km) upstream from Quebrada Jimenez, and 1.9 mi (3.1 km) southeast of Rio Grande. DRAINAGE AREA.--8.62 mi* (22.33 km*). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--February 1959 to April 1963 (annual low-flow and occasional measurements only), August 1966 to current year. GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 40 ft (12 m), from topographic map. REMARKS.--Records fair. AVERAGE DISCHARGE.--24 years (1967-90), 60.1 ft3 /s (1.702 m'/s), 94.68 in/yr (2,405 mm/yr), 43,540 acre-ft/yr (53.7 hm'/yr); median of yearly mean discharges, 58 ftVs (1.64 m3 /s), 42,000 acre-ft/yr (52 hm'/yr) . EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 19,200 ft'/s (544 m'/s) , Aug. 13, 1990, gage height, 15.74 ft (4.798 m) , from rating curve extended above 600 ft'/s (17.0 m3 /s) on basis of step-backwater analysis and slope- area measurement of peak discharge; minimum discharge, 4.0 ft'/s (0.113 m3 /s), July 3-5, 1975, Apr. 14, 15, 1984. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 3,000 ftVs (85.0 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (m'/s) (ft) (m) Date Time (ftVs) (m'/s) (ft) (m) Apr. 25 1445 4,370 124 8.22 2.505 Aug. 13 1545 *19,200 544 *15.74 4.798 May 10 1600 3,210 90.9 7.37 2.246 Minimum discharge, 9.4 ft'/s (0.266 m'/s), Dec. 28. REVISIONS.--The peak discharges and Annual maximum (*) reported for some water years have been revised as shown in the following table. They supersede figures published in the reports for 1971,1973,1975,1979,1984,1988, and 1989. WATER YEAR 1971 1973 1975 Discharge Date Oct. 9, Oct. 21, Aug . 15 , Sept. 4, Sept. 16, 1970 1972 1973 1973 1975 (ft'/s) *12,790 *13,520 11,330 13,020 *13,260 (m'/s) 362 383 321 369 376 Gage height (ft) *12.50 •12.88 11.79 12.61 *12.74 (m) 3.810 3.926 3.594 3.844 3.883 WATER YEAR 1979 1984 1988 1989 Discharge Date Oct. 26, Dec . 2 , Dec . 7 , Sept. 18, (ft'/s) (m'/s) 1978 1983 1987 1989 *11,450 *11,900 •16,770 *15,080 324 337 475 427 Gage height (ft) •11.85 •12.07 •14.52 •13.69 (m) 3.612 3.679 4.426 4.173 RIO ESPIRITU SANTO BASIN 293 50063800 RIO ESPIRITU SANTO NEAR RIO GRANDE, PR—Continued DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES DAY OCT NOV DEC JAN FEE MAR APR MAY JUN JUL AUG SEP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC- FT CFSM IN. CAL YR WTR YR 55 49 42 98 58 36 33 41 43 29 28 27 25 49 190 39 30 26 24 23 27 176 48 28 45 30 24 22 28 80 36 1489 48.0 190 22 2950 5.57 6.43 1989 1990 121 30 28 103 225 105 192 150 172 86 74 44 126 118 88 68 60 48 48 37 33 28 26 24 25 24 22 21 20 19 --- 2165 72.2 225 19 4290 8.37 9.34 TOTAL 27831 TOTAL 25636 19 18 17 17 16 16 16 15 15 14 14 13 13 13 12 13 12 12 12 12 11 11 11 11 10 10 9.7 13 126 25 34 560.7 18.1 126 9.7 1110 2.10 2.42 .7 MEAN .7 MEAN 132 191 70 35 20 17 17 17 16 16 19 21 17 17 18 38 123 111 116 237 58 32 94 156 169 87 72 51 89 44 31 2131 68.7 237 16 4230 7.97 9.20 76.3 MAX 70.2 MAX 45 31 30 26 22 20 25 126 146 64 56 35 25 349 51 37 61 95 111 50 88 163 100 113 50 71 48 52 ___ .-_ --- 2090 74.6 349 20 4150 8.66 9.02 2180 1180 172 53 35 31 28 27 26 22 191 133 519 792 951 413 119 207 123 93 62 55 48 44 44 39 55 63 126 79 107 56 42 4755 153 951 22 9430 17.8 20.52 MIN 9.7 MIN 9.7 33 48 40 30 27 25 23 22 21 30 23 21 44 38 23 89 27 23 27 118 32 25 23 93 809 99 46 33 28 25 --- 1945 64 .8 809 21 3860 7.52 8.39 AC-FT 55200 AC-FT 50850 29 33 26 23 24 20 18 18 48 458 90 38 160 195 99 53 68 108 38 30 26 24 22 21 19 66 49 23 19 16 35 1896 61.2 458 16 3760 7.10 8.18 CFSM 8, CFSM 8, 22 94 57 78 124 109 65 34 112 205 67 26 21 23 37 24 18 20 46 270 47 23 27 82 215 151 48 27 22 21 --- 2115 70.5 270 18 4200 8.18 9.13 .85 IN. .15 IN. 64 25 19 18 17 406 53 27 18 23 17 16 14 37 70 23 46 58 63 23 28 39 49 345 249 64 48 33 27 23 19 1961 63.3 406 14 3890 7.34 8.46 120.11 110.64 25 122 57 25 22 21 208 132 37 187 53 63 1180 130 79 58 49 65 47 40 35 82 63 47 48 46 34 31 33 32 27 3078 99.3 1180 21 6110 11.5 13.28 26 38 91 44 28 25 27 26 30 33 22 96 118 85 45 70 84 67 39 46 26 27 27 58 29 22 27 24 21 150 1451 48.4 150 21 2880 5.61 6.26 294 RIO ESPIRITU SANTO BASIN 50063800 RIO ESPIRITU SANTO NEAR RIO GRANDE, PR—Continued WATER-QUALITY RECORDS PERIOD OF RECORD.--Water years 1958, 1961-66, 1968 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 19. . . DEC 11. . . FEB 1990 05. . . APR 06. . . JUN 04. . . AUG 06. .. TIME 0820 0855 0840 0825 0750 0845 DIS- CHARGE, INST. CUBIC FEET PER SECOND 24 15 22 25 70 22 SPE- CIFIC CON- DUCT- ANCE (US/CM) 142 143 114 108 113 110 PH (STAND- ARD UNITS) 7.50 7.40 6.90 7.50 6.70 7.70 TEMPER- ATURE WATER (DEG C) 23.5 22.5 20.5 28.5 23.5 25.0 TUR- BID- ITY (NTU) 1.3 1.0 3.0 1.0 10 1.0 OXYGEN, DIS- SOLVED (MG/L) 8.2 8.4 8.7 8.2 8.2 6.3 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 94 95 96 94 96 75 OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 16 18 35 <10 27 11 COLI- FORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) 390 K700 K1200 290 400 K720 STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) 430 310 470 230 1000 320 OCT 1989 19. . . DEC 11. . . FEB 1990 05. .. APR 06. . . JUN 04. . . AUG 06. . . HARD- NESS TOTAL (MG/L AS HARD- NESS NONCARB CALCIUM WH WAT TOT FLD CACO3) CACO3 40 37 41 DIS- SOLVED MG/L AS (MG/L MAGNE- SIUM, SODIUM, DIS- DIS- SOLVED SOLVED (MG/L (MG/L AS CA) AS MG) AS NA) SODIUM AD- SORP- TION RATIO ALKA- POTAS- LINITY SIUM, WAT WH DIS- SOLVED AS K) 8.7 4.5 9.6 0.7 1.2 8.2 4.1 9.4 0.7 1.2 9.3 4.4 9.1 0.6 0.7 SULFATE TOT FET SULFIDE DIS- FIELD TOTAL SOLVED (MG/L MG/L AS (MG/L CAC03 41 49 36 38 15 37 (MG/L CHLO- RIDE, DIS- SOLVED (MG/L AS S) AS S04) AS CL) 0.8 2.0 11 <0.5 1.9 11 1.8 12 OCT 19 DEC 11 FEB 05 APR 06 JUN 04 AUG 06 K = FLUO- RIDE, DIS- SOLVED DATE (MG/L AS F) 1989 <0.10 1990 . . . <0.10 . . . <0.10 non- ideal count SILICA, DIS- SOLVED (MG/L AS SIO2) 21 -- -- 21 -- 42 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 83 -- -- 80 -- 101 SOLIDS, DIS- SOLVED (TONS PER DAY) 5.44 -- -- 5.42 -- 6.11 RESIDUE TOTAL NITRO- AT 105 GEN, DEG. C, NITRATE SUS- TOTAL FENDED (MG/L (MG/L) AS N) <1 <1 28 <1 <1 0.19 <1 0.09 NITRO- GEN, NITRITE TOTAL (MG/L AS N) <0.01 <0.01 <0.01 <0.01 0.01 <0.01 NITRO- GEN, N02+N03 TOTAL (MG/L AS N) <0.10 <0.10 0.10 <0.10 0.20 <0.10 NITRO- GEN, AMMONIA TOTAL (MG/L AS N) 0.02 0.01 0.02 <0.01 0.02 0.02 NITRO- GEN, ORGANIC TOTAL (MG/L AS N) -- -- -- -- 0.38 0.38 RIO BSPIRITU SANTO BASIN 50063800 RIO BSPIRITO SANTO NEAR RIO GRANDB, PR—Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 295 OCT 1989 19.. . DEC 11. . . FBB 1990 05.. . APR 06. . . JUN 04. .. AUG 06.. . DATE OCT 1989 19.. . DEC 11.. . FBB 1990 05.. . APR 06. .. JUN 04.. . AUG 06.. . NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) <0.20 <0.20 <0.20 <0.20 0.40 0.40 IRON, TOTAL RECOV- ERABLE (UG/L AS FB) NITRO- GEN, TOTAL (MG/L AS N) -- — — — 0.60 0.60 LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) NITRO- GEN, TOTAL (MG/L AS N03) -- -- -- -- 2.7 2.1 MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) PHOS- PHORUS TOTAL (MG/L AS P) 0.01 0.02 0.03 0.01 0.02 0.01 MERCURY TOTAL RECOV- ERABLE (UG/L AS HG) ARSENIC TOTAL (UG/L AS AS) <1 -- -- <1 -- -- SELE- NIUM, TOTAL (UG/L AS SB) BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 — — <100 -- -- SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) BORON, TOTAL RECOV- ERABLE (UG/L AS B) <10 -- -- <10 -- -- ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- <1 -- -- CYANIDE TOTAL (MG/L AS CN) CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) <1 -- -- <1 -- -- PHENOLS TOTAL (UG/L) COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) <10 — — <10 — -- METHY- LENE BLUB ACTIVE SUB- STANCE (MG/L) 260 200 20 10 <0.010 <0.10 0.01 0.03 296 RIO MAMEYES BASIN 50065500 RIO MAMEYES NEAR SABANA, PR LOCATION.--Lat 18°19'46", long 65°45'04 M / Hydrologic Unit 21010005, on left bank, at bridge on Highway 988, 1.4 mi (2.3 km) west of Sabana, 2.0 mi (3.2 km) downstream from Rio de la Mina, and 3.2 mi (5.1 km) southeast of Mameyes. DRAINAGE AREA.--6.88 mi a (17.82 km a ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--August 1967 to December 1973. June 1983 to current year. GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 275 ft (84 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. AVERAGE DISCHARGE.--13 years (1968-73, 1984-90), 58.6 ft3/s (1.660 m3/s), 115.67 in/yr (2,938 mm/yr), 42,460 acre-ft/yr (52.4 hm3/yr); median of yearly mean discharges, 59 ft3/s (1.67 m3 /s), 42,700 acre-ft/yr (53 hmVyr) . EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 20,500 ftVs (580 mj/s), Sept. 18, 1989, gage height, 13.19 ft (4.020 m), from rating curve extended above 1,800 ft3 /s (51.0 mVs) on basis of slope-area measurement of peak flow; minimum discharge, 5.1 ftVs (0.144 m3 /s), Apr. 8, 9, 1970. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 4,000 ft3 /s (113 m3 /s) and maximum (*): Discharge ° Time (ft3/s) (m3/s) Gage height (ft) (m) Date Apr. 25 1430 *12,160 344 *10.90 3.322 Minimum discharge, 11 ft3/s (0.312 m3/s), Dec. 22-25, 27,28. Date Aug. 13 Discharge Time (ft3/s) (m3/s) 1530 *9,960 282 Gage height (ft) (m) *10.21 3.112 DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES OCT NOV DEC JAN APR JUN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC- FT CFSM IN. CAL YR WTR YR 47 43 38 64 45 33 33 33 33 28 27 26 25 35 184 39 50 32 28 26 27 57 32 26 29 29 24 22 23 56 42 1236 39.9 184 22 2450 5.80 6.68 1989 1990 159 39 33 73 143 72 105 112 116 59 65 46 58 55 64 53 65 48 44 36 32 29 28 26 25 25 23 22 21 20 1696 56.5 159 20 3360 8.22 9.17 TOTAL 22427 TOTAL 19111 20 19 18 17 17 16 16 16 15 15 14 14 14 13 13 13 13 13 13 13 12 11 12 12 12 12 12 16 46 19 50 516 16.6 50 11 1020 2.42 2.79 MEAN MEAN 96 124 56 31 21 20 18 18 17 18 23 22 20 18 19 28 50 76 64 120 39 30 48 101 79 47 47 34 42 30 e22 1378 44.5 124 17 2730 6.46 7.45 61.4 MAX 52.4 MAX e37 el8 el8 e!7 e!6 e20 el9 e20 e30 e58 e35 e20 e60 e!03 e25 e29 e32 e26 e20 e36 e50 e65 e70 e25 e26 e22 e21 22 ___ ___ --- 940 33.6 103 16 1860 4.88 5.08 2780 MIN 945 MIN 43 21 18 16 15 15 14 14 94 94 244 382 434 184 73 100 74 55 44 40 37 36 36 33 39 41 83 53 57 46 35 2470 79.7 434 14 4900 11.6 13.36 11 AC- FT 11 AC-FT 31 51 36 31 28 26 25 25 24 29 25 24 44 48 29 76 28 25 24 70 34 31 31 31 945 82 46 34 29 27 --- 1989 66.3 945 24 3950 9.64 10.75 44480 37910 27 28 23 23 22 21 21 19 98 . 201 58 38 92 107 67 54 60 80 54 53 52 54 51 48 47 290 128 74 58 55 73 2076 67.0 290 19 4120 9.73 11.22 CFSM 8.93 CFSM 7.61 65 122 100 78 95 93 73 70 78 141 75 53 48 53 56 47 47 51 79 116 46 37 43 54 113 96 47 40 36 38 --- 2090 69.7 141 36 4150 10.1 11.30 IN. 121 IN. 103 53 39 35 34 31 190 63 36 30 30 27 25 24 34 32 24 45 49 49 36 33 31 44 151 118 60 56 44 39 36 34 1532 49.4 190 24 3040 7.18 8.28 .26 .33 32 45 41 36 39 44 116 97 61 113 72 64 418 83 52 41 37 39 ,35 31 30 77 67 37 40 33 28 27 26 25 23 1909 61.6 418 23 3790 8.95 10.32 23 24 33 30 36 22 22 21 35 29 22 103 113 80 37 67 65 39 37 49 33 39 42 31 27 27 30 27 26 110 --- 1279 42.6 113 21 2540 6.20 6.92 e Estimated RIO MAMEYES BASIN 50065500 RIO MAMEYES NEAR SABANA, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS JUNE 1983 TO CURRENT YEAR STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEC C) OCT. NOV. DEC. JAN. JAN. MAR. 04 1120 15 0905 19 1210 11 0917 30 1032 22 1645 33.3 57.7 12.5 22.0 30.7 35.5 105 102 120 109 103 102 25.0 23.5 23.5 23.0 22.0 24.0 DATE TIME APR. 17 1235 MAY 08 0810 JUNE 18 1318 JULY 17 1658 AUG. 28 1535 STREAMFLOW, INSTANTANEOUS (CFS) 27.2 19.7 42.7 77.8 26.2 297 SPECIFIC CON- TEMPERA- DOCTANCE TORE (OMHOS) (DEC C) SEPT 20 1612 41.6 97 111 98 100 108 93 25.0 24.0 25.5 25.5 27.0 27.0 298 RIO SABANA BASIN 50067000 RIO SABANA AT SABANA, PR LOCATION.--Lat 18°19'52" / long 65°43'52", Hydrologic Dnit 21010005, on right bank along Highway 988, 0.3 mi (0.5 km) north of junction of Highways 988 and 983 in Sabana, and 3.3 mi (5.3 km) south of Luquillo. DRAINAGE AREA.--3.96 mi 3 (10.26 km3 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--October 1979 to current year. GAGE.—Water-stage recorder and crest-stage gage. Elevation of gage is 260 ft (80 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. AVERAGE DISCHARGE.--11 years (1980-90), 19.9 ft3 /s (0.564 m3 /s)/ 68.24 in/yr (1,733 mm/yr), 14,420 acre-ft/yr (17.8 hmVyr); median of yearly mean discharges, 20 ft3/s (0.57 mVs), 14,500 acre-ft/yr (18 hmVyr) . EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 9,010 ft3 /s (255 m'/s) / Apr. 21, 1983, gage height, 19.35 ft (5.898 m) , from floodmark, from rating curve extended above 200 ft3/s (5.66 m3 /s) on basis of step-backwater analysis and slope-area measurement; minimum discharge, 0.86 ft3 /s (0.024 m3 /s), Apr. 17, 1983. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,500 ft3 /s (42.5 m3 /s) and maximum (*): Apr. 25 July 6 Time 1015 0645 Discharge (ft3 /s) (m3 /s) 2,900 1,520 82.1 43.0 Gage height (ft) (m) 14.22 4.334 12.23 3.728 Date Aug. 13 Time 1600 Discharge (ft3 /s) (m3/s) *4,660 132 Gage height (ft) (m) *16.08 4.901 Minimum discharge, 1.5 ftVs (0.042 m3/s), Dec. 25-28,30. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES NOV JAN JUL AUG 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC -FT CFSM IN. CAL YR WTR YR 14 13 13 11 10 9.9 11 9.4 8.6 8.1 7.9 8.6 e7.5 elO e70 ell e!4 elO e8.0 e7.0 e7.5 e20 e9.0 e7.5 e8.0 e8.0 e7.0 e6.0 e6.5 e20 e!5 376.5 12.1 70 6.0 747 3.07 3.54 1989 1990 e60 e20 elO e20 e50 e20 e25 e35 e40 e!5 e!8 ell e!3 e!2 e!4 e!3 e!6 e!3 e!2 ell elO e9. 0 e8.5 e8.0 e7.5 e7.0 e7.0 e6.5 e6.5 e6.0 --- 504.0 16.8 60 6.0 1000 4.24 4.73 TOTAL 7240, TOTAL 5577, e5.6 e5.4 e5.2 e5.0 e4.8 e4.5 e4.3 e4.0 e4.0 e3.7 e3 .7 e3.5 e3.5 e3.3 e3 .2 e3.2 e3.0 e2.8 e2.5 e2.5 e2.3 2 .0 1.9 2.0 1.9 1.7 1.7 2.0 5.4 2.0 21 121.6 3.92 21 1.7 241 .99 1.14 .3 MEAN .0 MEAN 34 70 22 6.1 3.6 2.9 2.6 2.5 2.2 2.5 3.2 3.1 4.4 2.7 2.7 3.8 5.4 23 19 32 9.7 5.9 14 24 17 7.9 8.7 6.0 7.6 5.5 4.4 358.4 11.6 70 2.2 711 2.92 3.37 19.8 MAX 15 . 3 MAX 6.5 4.7 4.2 4.2 3.8 3.4 4.9 8.8 14 8.6 16 5.8 4.3 43 7.2 5.4 7.3 7.7 5.1 4.6 12 14 14 12 6.0 6.2 5.0 5.2 ___ ___ --- 243.9 8.71 43 3.4 484 2.20 2.29 887 MIN 569 MIN 7.1 5.3 4.3 4.4 3.8 3.8 3.6 3.3 16 elO e20 e60 e200 e90 e50 e20 e30 e20 e!5 e!2 elO e9.5 8.4 7.5 7. 6 8.4 18 21 21 20 18 15 21 16 18 16 13 13 14 13 13 12 12 14 16 12 20 14 20 13 23 16 12 12 11 569 36 14 10 8.3 7.7 --- 728.0 1004.0 23.5 200 3.3 1440 5.93 6.84 1.7 AC-FT 1.7 AC-FT 33.5 569 7.7 1990 8.45 9.43 14360 11060 7.5 8.8 6.6 6.3 6.1 5.6 6.9 10 13 68 13 7.0 16 21 8.9 7.0 6.6 10 6.7 5.9 5.6 5.5 5.1 5.0 4.7 96 59 17 7.1 5.7 7.2 458.8 14.8 96 4.7 910 3.74 4.31 CFSM 5. CFSM 3 . 6.0 20 6.9 10 e!3 e9.5 e8.0 e7.0 e8.0 e!7 e9.0 e6.0 e5.0 e7.0 e6.5 e5.0 e7.0 e20 25 11 5.9 5.0 5.3 8.9 50 26 7.1 6.6 6.1 5.8 --- 333.6 11.1 50 5.0 662 2.81 3.13 ,01 IN. 68 ,86 IN. 52 6.9 5.7 5.3 5.6 5.3 150 24 16 8.6 8.4 7.1 6.5 6.0 7.1 6.3 5.5 5.7 5.9 7.0 4.8 4.2 3.9 6.7 108 33 11 7.9 5.8 5.2 4.7 4.3 492.4 15.9 150 3.9 977 4.01 4.63 .01 .39 4.2 4.4 5.3 3.8 4.8 3.9 58 42 7.5 19 11 8.2 287 39 16 12 elO e9.0 e8.5 e8.0 e7.5 e30 e20 elO e!5 ell e8.0 e7.0 6.3 5.9 5.9 688.2 22.2 287 3.8 1370 5.61 6.46 5.3 5.6 6.7 6.5 7.2 5.5 5.5 5.4 12 13 5.5 7.2 17 19 8.4 7.1 21 6.2 6.3 10 5.8 6.5 5.7 5.3 5.3 4.8 29 6.0 4.8 14--- 267.6 8.92 29 4.8 531 2.25 2.51 e Estimated RIO SABANA BASIN 299 50067000 RIO SABANA AT SABANA, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS AUGUST 1981 TO CURRENT YEAR STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEC C) 27.0 25.5 23.0 25.0 24.5 25.0 OCT. 04 1433 NOV. 14 1441 DEC. 19 0937 JAN. 10 1434 JAN. 30 1257 MAR. 22 1406 10.8 11.9 2.87 4.11 5.13 9.63 106 107 135 135 123 104 DATE TIME APR. 17 0945 MAY 07 1530 JUNE 18 1026 JULY 17 1400 AUG. 28 1206 SEPT 20 1353 STREAMFLOW, INSTANTANEOUS (CFS) 11.5 6.35 4.84 5.44 6.99 10.4 SPECIFIC CON- TEMPERA- DUCTANCE (UMHOS) 122 117 115 121 118 100 TURE (DBG C) 25.0 27.0 27.0 27.0 28.0 28.0 300 RIO FAJARDO BASIN 50071000 RIO FAJARDO NEAR FAJARDO, PR LOCATION.--Lat 18°17'56", long 65 0 41'42 M , Hydrologic Unit 21010005, on left bank off Highway 976, 0.1 mi (0.2 km) upstream from Highway 977 bridge, 0.3 mi (0.5 km) downstream from Quebrada Penon, 1.1 ml (1.8 km) northeast of Colonia Paraiso, and 3.3 mi (5.3 km) southwest of Fajardo. DRAINAGE AREA.--14.9 mi a (38.6 km 2 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--1960-61 (occasional low and peak-flow measurements only), March 1961 to current year. GAGE.--Water-stage recorder. Datum of gage is 137.60 ft (41.940 m) above mean sea level. Due to flood damage, gage datum has had changes as follows: Mar. 24, 1961 to May 5, 1969, 138.95 ft (42.352 m); May 6, 1969 to Mar. 16, 1972, 135.05 ft (41.163 m) ; Mar. 17, 1972 to Mar. 25, 1975, 138.60 ft (42.245 m). REMARKS.--Records fair. Low flow affected by diversions for water supply about 400 m upstream from gaging station (estimated mean daily discharges is 9.0 ftVs (0.255 m3/s) . Gage-height and precipitation satellite telemetry at station. AVERAGE DISCHARGE.--29 years (1962-90), 69.0 ft3 /s (1.954 m3 /s), 62.89 in/yr (1,597 mm/yr), 49,990 acre-ft/yr (61.6 hmVyr); median of yearly mean discharges, 69 ft 3 /s (1.95 m3 /s), 50,000 acre-ft/yr (62 hmVyr) . EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 23,500 ft 3 /s (665 m3/s), Sept. 18, 1989, gage height, 20.00 ft (6.096 m), datum then in use, from rating curve extended above 100 ft 3 /s (2.83 m3/s) on basis of step-backwater analysis, slope-area measurements, and contracted opening of peak discharges; minimum discharge, 0.86 ft3/s (0.024 m3 /s). May 3, 1984. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 3,500 ft3 /s (99.1 m3/s) and maximum (*): Apr. 25 July 6 Time 1520 0745 Discharge (ft'/s) (m3 /s) Gage height (ft) (m) 4,370 3,730 124 106 8.68 8.13 2.646 2.478 Date Aug. 13 Time 1615 Discharge (ft 3 /s) (m3/s) *6,690 189 Gage height (ft) (m) *10.41 3.173 Minimum daily discharge, 6.8 ft3/s (0.192 m3 /s), Apr. 24. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES OCT NOV JUN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC- FT CFSM IN. CAL YR WTR YR 57 58 53 46 44 41 46 41 41 39 38 36 36 44 213 60 62 43 35 33 32 49 34 28 47 54 29 25 28 47 43 1482 47.8 213 25 2940 3.21 3.70 1989 1990 103 34 28 75 170 54 48 167 131 48 38 32 32 35 122 81 74 45 59 36 29 25 22 21 19 22 18 18 17 17 --- 1620 54.0 170 17 3210 3.62 4.04 TOTAL 31947, TOTAL 17374, 16 15 15 15 14 15 14 13 12 13 12 12 12 11 10 10 9.9 9.3 9.4 9.7 11 9.4 9.4 9.0 8.7 8.2 8.8 7.3 32 12 98 461.1 14.9 98 7.3 915 1.00 1.15 .9 MEAN .4 MEAN 145 153 76 24 15 12 12 11 9.3 10 14 9.2 8.5 7.6 7.1 17 20 17 32 123 28 15 33 60 68 31 27 18 16 11 9.2 1038.9 33.5 153 7.1 2060 2.25 2.59 87.5 MAX 47.6 MAX 35 13 14 13 9.1 7.2 11 53 228 56 69 26 16 207 33 20 27 35 24 17 87 82 75 67 27 32 21 17___ ___ --- 1321.3 47 .2 228 7.2 2620 3.17 3.30 8800 982 90 28 16 14 12 11 9.8 8.5 138 115 225 416 629 248 82 88 97 67 34 29 24 21 29 17 34 25 104 57 35 47 23 2773.3 89.5 629 8.5 5500 6.00 6.92 MIN 2.6 MIN 6.8 17 23 21 23 15 12 10 10 9.1 16 12 8.1 27 101 19 88 17 12 12 38 24 12 9.8 6.8 982 105 44 27 22 19--- 1741.8 58.1 982 6.8 3450 3.90 4.35 AC-FT 63370 AC-FT 34460 21 21 19 16 15 14 13 13 31 107 30 19 45 51 28 24 19 20 15 14 14 12 12 11 11 176 60 36 22 18 26 933 30.1 176 11 1850 2.02 2.33 CFSM 5. CFSM 3 , 20 69 32 45 59 45 25 28 29 30 37 23 20 21 24 20 50 84 97 101 52 40 44 55 105 104 46 39 34 32 --- 1410 47.0 105 20 2800 3.15 3.52 .87 IN. ,19 IN. 35 32 28 29 28 550 182 44 31 30 25 22 20 37 34 22 34 42 31 20 18 16 16 104 86 27 20 18 16 15 14 1626 52.5 550 14 3230 3.52 4.06 79.76 43.38 13 36 24 13 18 16 104 43 35 140 52 47 466 103 51 37 31 30 27 24 23 88 53 31 49 36 23 21 26 22 17 1699 54.8 466 13 3370 3.68 4.24 17 17 24 25 95 27 18 19 37 37 22 146 158 112 44 60 77 36 31 30 23 24 26 22 19 18 27 22 19 36 1268 42.3 158 17 2520 2.84 3.17 RIO FAJARDO BASIN 50071000 RIO FAJARDO NEAR FAJARDO, PR—Continued WATER-QUALITY RECORDS PERIOD OF RECORD.--Water years 1960 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 301 DATE OCT 1989 03. .. NOV 28. .. JAN 1990 30. .. APR 04. . . JUN 01. .. AUG 02. .. TIME 0815 0840 0850 0850 0920 0855 DIS- CHARGE, INST. CUBIC FEET PER SECOND 56 18 12 23 19 12 SPE- CIFIC CON- DUCT- ANCE (US/CM) 140 134 128 128 115 132 PH (STAND- ARD UNITS) 7.40 7.20 7.10 7.10 7.20 7.60 TEMPER- ATURE WATER (DEG C) 25.0 24.5 23.5 24.5 27.0 28.0 TUR- BID- ITY (NTU) 82 1.2 2.1 3.8 2.8 1.3 OXYGEN, DIS- SOLVED (MG/L) 7.8 8.2 8.6 7.8 8.5 8.4 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 94 98 100 93 104 107 OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 26 12 12 10 14 13 COLI- FORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) 220 K20 K20 310 430 K27 STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) 600 550 K130 320 K160 K110 DATE OCT 1989 03. .. NOV 28. . . JAN 1990 30. . . APR 04. . . JUN 01. .. AUG 02. .. HARD- NESS TOTAL (MG/L AS HARD- NESS NONCARB WH WAT TOT FLD MG/L AS CALCIUM DIS- SOLVED (MG/L CACO3) CACO3 33 35 39 MAGNE- SIUM, DIS- SODIUM, DIS- SOLVED SOLVED (MG/L (MG/L AS CA) AS MG) AS NA) 7.3 3.6 11 8.4 3.4 12 8.8 4.2 13 SODIUM AD- SORP- TION RATIO POTAS- SIUM, DIS- SOLVED ALKA- LINITY WAT WH TOT FET FIELD SULFIDE TOTAL SULFATE DIS- SOLVED (MG/L MG/L AS AS K) 0.8 1.9 0.9 2.6 0.9 2.9 CACO3 37 39 36 51 31 39 (MG/L <0.5 <0.5 (MG/L 5.0 3.9 3.6 CHLO- RIDE, DIS- SOLVED (MG/L AS S) AS S04) AS CL) 13 14 15 . DATE OCT 1989 03.. . NOV 28.. . JAN 1990 30.. . APR 04. .. JUN 01.. . AUG 02.. . FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.10 -- -- <0.10 -- 0.30 SILICA, DIS- SOLVED (MG/L AS SIO2) 23 -- -- 24 -- 26 SOLIDS, SUM OF CONSTI - TUENTS, DIS- SOLVED (MG/L) 87 -- -- -89 -- 97 SOLIDS, DIS- SOLVED (TONS PER DAY) 13.2 -- -- 5.53 -- 3.20 RESIDUE TOTAL NITRO- AT 105 GEN, DEG. C, NITRATE SUS- TOTAL FENDED (MG/L (MG/L) AS N) 117 0.29 5 7 <1 1 0.18 <1 0.99 NITRO- GEN, NITRITE TOTAL (MG/L AS N) 0.01 <0.01 <0.01 <0.01 0.02 0.01 NITRO- GEN, N02+N03 TOTAL (MG/L AS N) 0.30 0.40 0.20 0.10 0.20 <0.10 NITRO- GEN, AMMONIA TOTAL (MG/L AS N) 0.03 <0.01 0.02 <0.01 0.01 0.02 NITRO- GEN, ORGANIC TOTAL (MG/L AS N) 0.37 -- -- — 0.49 0.28 K = non-ideal count 302 RIO FAJARDO BASIN 50071000 RIO FAJARDO NEAR FAJARDO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 03.. . NOV 28. . . JAN 1990 30. . . APR 04. .. JUN 01.. . AUG 02. .. DATE OCT 1989 03.. . NOV 28... JAN 1990 30. . . APR 04. .. JON 01. . . AUG 02. .. NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.40 <0.20 <0.20 <0.20 0.50 0.30 IRON, TOTAL RECOV- ERABLE (UG/L AS FB) 5600 -- -- 920 -- -- NITRO- GEN, TOTAL (MG/L AS N) 0.70 -- -- -- 0.70 0.40 LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) 12 -- -- 1 -- -- NITRO- GEN, TOTAL (MG/L AS NO3) 3.0 -- -- -- 3.1 2.7 MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MM) 130 -- -- 20 -- -- PHOS- PHORUS TOTAL (MG/L AS P) 0.06 <0.01 0.03 0.03 0.02 0.01 MERCURY TOTAL RECOV- ERABLE (UG/L AS HG) <0.10 -- -- <0.10 -- -- BARIUM, TOTAL ARSENIC RECOV- TOTAL ERABLB (UG/L (UG/L AS AS) AS BA) <1 <100 __ __ <1 <100 __ .. SILVER, SELE- TOTAL NIUM, RECOV- TOTAL ERABLE (UG/L (UG/L AS SE) AS AG) <1 <1 __ __ <1 <1 __ __ CHRO- BORON, CADMIUM MIUM, TOTAL TOTAL TOTAL RECOV- RECOV- RECOV- ERABLE ERABLB ERABLE (UG/L (UG/L (UG/L AS B) AS CD) AS CR) <10 1 <1 __ __ 10 <1 <1 __ .. ZINC, TOTAL RECOV- CYANIDE ERABLE TOTAL PHENOLS (UG/L (MG/L TOTAL AS ZN) AS CN) (UG/L) 20 <0.010 <1 __ __ <10 <0.010 <1 __ __ COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) 10 -- -- 10 -- " METHY- LENE BLUE ACTIVE SUB- STANCE (MG/L) 0.10 -- -- 0.05 -- -- PESTICIDE ANALYSES JON 1990 01. . . CHLOR- PCB, ALDRIN, DANE, ODD, DDE, DOT, TIME TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (OG/L) (OG/L) (UG/L) (OG/L) 0920 <0.1 <0.010 <0.1 <0.010 <0.010 <0.010 DI- AZINON, TOTAL (UG/L) DI- ELDRIN TOTAL (UG/L) ENDO- SULFAN, TOTAL (OG/L) <0.01 <0.010 <0.010 JUN 1990 01. . . HEPTA- HEPTA- CHLOR MALA- ENDRIN, ETHION, CHLOR, EPOXIDE LINDANE THION, TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) <0.010 <0.01 <0.010 <0.010 <0.010 <0.01 METH- OXY- CHLOR, TOTAL (OG/L) <0.01 METHYL PARA- THION, TOTAL (UG/L) <0.01 METHYL TRI- THION, TOTAL (UG/L) <0.01 MI REX, TOTAL (UG/L) <0.01 DATE JUN 1990 01. . . PARA- THION, TOTAL (OG/L) <0.01 NAPH- THA- LENES, POLY- CHLOR. TOTAL (OG/L) <0.10 P5R- THANE TOTAL (OG/L) <0.1 TOX- APHENE, TOTAL (OG/L) <1 TOTAL TRI- THION (OG/L) <0.01 2,4-D, TOTAL (OG/L) <0.01 2,4,5-T TOTAL (UG/L) <0.01 2, 4 -DP TOTAL (OG/L) <0.01 SILVEX, TOTAL (OG/L) <0.01 RIO FAJARDO BASIN 303 50072500 RIO FAJARDO BELOW FAJARDO, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°19'35", long 65°38'47", 1.2 mi (1.9 km) southwest of Playa de Fajardo, and 0.5 mi (0.8 km) east of Fajardo plaza. DRAINAGE AREA.--23.4 mi* (60.6 km*). PERIOD OF RECORD.--Water years 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 03. .. NOV 28. . . JAN 1990 30. . . APR 04. .. JUN 01. . . AUG 02. . . TIME 1040 1045 1045 1115 1125 1045 DIS- CHARGE, INST. CUBIC FEET PER SECOND 76 22 21 29 22 13 SPE- CIFIC CON- DUCT- ANCE (US/CM) 168 186 192 154 135 159 PH (STAND- ARD UNITS) 7.20 7.10 7.00 7.30 7.30 7.50 TEMPER- ATURE WATER (DEC C) 27.0 26.0 24.5 27.0 29.5 29.5 TUR- BID- ITY (NTU) 16 3.1 3.0 2.0 3.0 2.1 OXYGEN, DIS- SOLVED (MG/L) 7.5 7.4 7.7 8.0 8.3 7.1 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 92 89 90 98 107 91 OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) <10 12 <10 15 14 11 COLI- FORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) K7000 490 1460 4100 K730 4700 STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) 2000 K10 K90 460 K100 K130 OCT 1989 03. .. NOV 28. .. JAN 1990 30. .. APR 04. .. JUN 01. .. AUG 02. .. HARD- NESS TOTAL (MG/L AS HARD- NESS NONCARB WH WAT TOT FLD CALCIUM DIS- SOLVED MG/L AS (MG/L MAGNE- SIUM, SODIUM, DIS- DIS- SOLVED SOLVED (MG/L 41 39 41 (MG/L CACO3) CACO3 AS CA) AS MG) AS NA) 9.4 4.3 13 9.2 3.9 14 9.2 4.3 15 SODIUM AD- SORP- TION RATIO POTAS- SIUM, DIS- SOLVED AS K) 0.9 1.9 1 1.4 1 1.3 ALKA- LINITY WAT WH TOT FET FIELD (MG/L MG/L AS SULFIDE TOTAL (MG/L CACO3 41 44 43 38 36 36 CHLO- SULFATE RIDE, DIS- DIS- SOLVED SOLVED (MG/L (MG/L AS S) AS SO4) AS CL) <0.5 5.0 18 <0.5 4.5 19 4.3 23 DATE OCT 1989 03.. . NOV 28.. . JAN 1990 30.. . APR 04.. . JUN 01.. . AUG 02. .. FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.10 -- -- <0.10 -- <0.10 SILICA, DIS- SOLVED (MG/L AS SI02) 21 -- -- 22 -- 23 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 97 -- -- 97 -- 102 SOLIDS, DIS- SOLVED (TONS PER DAY) 19.9 -- -- 7.59 -- 3.60 RESIDUE TOTAL AT 105 DEC. C, SUS- PENDED (MG/L) 14 26 11 <1 1 10 NITRO- GEN, NITRATE TOTAL (MG/L AS N) 0.19 -- -- -- -- 0.99 NITRO- GEN, NITRITE TOTAL (MG/L AS N) 0.01 <0.01 <0.01 <0.01 <0.01 0.01 NITRO- GEN, NO2+NO3 TOTAL (MG/L AS N) 0.20 0.20 0.20 <0.10 0.10 0.10 NITRO- GEN, AMMONIA TOTAL (MG/L AS N) 0.11 0.03 0.06 0.03 0.02 0.07 NITRO- GEN, ORGANIC TOTAL (MG/L AS N) 0.39 -- -- -- -- 0.13 K = non-ideal count 304 RIO FAJARDO BASIN 50072500 RIO FAJARDO BELOW FAJARDO, PR- -Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 03. .. NOV 28. .. JAN 1990 30. . . APR 04. .. JUN 01. . . AUG 02. .. DATE OCT 1989 03. .. NOV 28. . . JAN 1990 30. . . APR 04.. . JUN 01.. . AUG 02.. . NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.50 <0.20 <0.20 <0.20 <0.20 0.20 IRON, TOTAL RECOV- ERABLE (UG/L AS FE) 1700 -- -- 370 -- -- NITRO- NITRO- GEN, GEN, TOTAL TOTAL (MG/L (MG/L AS N) AS NO3) 0.70 3.1 __ __ __ __ 0.30 1.3 MANGA- LEAD, NESE, TOTAL TOTAL RECOV- RECOV- ERABLE ERABLE (UG/L (UG/L AS PB) AS MN) 5 100 __ __ <1 60 __ __ PHOS- PHORUS ARSENIC TOTAL TOTAL (MG/L (UG/L AS P) AS AS) 0.04 <1 0.02 0.04 0.03 <1 0.02 0.06 MERCURY TOTAL SELE- RECOV- NIUM, ERABLE TOTAL (UG/L (UG/L AS HG) AS SB) <0.10 <1 __ -_ <0.10 <1 __ __ BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 -- -- <100 -- -- SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) <1 -- -- <1 __ -- CHRO- BORON, CADMIUM MIUM, COPPER, TOTAL TOTAL TOTAL TOTAL RECOV- RECOV- RECOV- RECOV- ERABLE ERABLE ERABLE ERABLE (UG/L (UG/L (UG/L (UG/L AS B) AS CD) AS CR) AS CU) 10 <1 <1 20 __ __ <10 <1 <1 <10 __ -*• — - -- - — METHY- ZINC, LENE TOTAL BLUE RECOV- CYANIDE ACTIVE ERABLE TOTAL PHENOLS SUB- (UG/L (MG/L TOTAL STANCE AS ZN) AS CN) (UG/L) (MG/L) <10 <0.010 3 0.04 __ __ <10 <0.010 4 0.04 __ __ RIO BLANCO BASIN 50075000 RIO ICACOS NEAR NAGUABO, PR 305 LOCATION.--Lat 18°16'38", long 65°47'09", Hydrologic Dnit 21010001, in Caribbean National Forest, off Highway 191, at El Yungue, 1.6 mi (2.6 km) upstream from confluence with Rio Cubuy, 2.8 mi (4.5 km) north of Florida, and 5.3 mi (8.5 km) northwest of Naguabo Plaza. DRAINAGE AREA.--1.26 mi» (3.26 km»). WATER-DISCHARGE RECORDS PERIOD OF RECORD.—July 1945 to March 1953 (operated by Puerto Rico Water Resources Authority), annual maximum, water years 1953-62, annual low-flow measurements 1962-66, October 1979 to current year. GAGE.--Water-stage recorder, crest-stage gage and sharp-crested weir. Elevation of gage is 2,020 ft (616 m), from topographic map. REMARKS.--Records fair. AVERAGE DISCHARGE.--18 years (1946-52, 1980-90), 15.0 ft'/s (0.425 m'/s), 161.68 in/yr (4,107 mm/yr), 10,870 acre-ft/yr (13.4 hm'/yr); median of yearly mean discharges, 14 ft'/s (0.40 m'/s), 10,100 acre-ft/yr (12 hm'/yr) . EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 2,860 ft'/s (81.0 mVs), Apr. 21, 1983, gage height, 8.96 ft (2.731 m) , from rating curve extended above 30 ft3 /s (0.850 m3 /s) on basis of step-backwater analysis; minimum daily discharge, 1.5 ft'/s (0.042 m3 /s), Mar. 22, Apr. 10, 1946. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 650 ftVs (18.4 mVs) and maximum (*): Discharge (ftVs) (m'/s) Gage height (ft) (m) Date Time Apr. 25 1430 *1,220 34.6 *6.64 2.024 Minimum discharge, 3.9 ft'/s (0.110 m'/s), Dec. 25-28. Discharge (ftVs) (m'/s) Date Time No other peak greater than base discharge. Gage height (ft) (m) DISCHARGE, COBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES DAY OCT NOV MAR APR MAY JUN AUG 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC -FT CFSM IN. CAL YR WTR YR 13 12 12 49 15 12 13 17 13 12 12 11 11 23 60 12 11 10 9.8 9.6 11 10 9.3 9.0 9.3 8.7 8.4 8.3 8.0 12 9.1 440.5 14.2 60 8.0 874 11.3 13.01 1989 1990 16 8.9 8.7 14 29 15 18 26 27 10 11 10 15 15 16 9.9 11 9.6 10 8.8 7.9 7.3 6.9 6.8 6.6 6.5 6.2 6.0 6.0 6.0 --- 355.1 11.8 29 6.0 704 9.39 10.48 TOTAL 5547, TOTAL 4842, 5.7 5.6 5.6 5.6 5.3 5.3 5.2 5.2 5.2 5.0 4.9 4.9 4.8 4.8 4.6 4.5 4.5 4.6 4.5 4.5 4.2 4.2 4.3 4.2 4.2 3.9 3.9 4.9 7.8 4.6 8.1 154.6 4.99 8.1 3.9 307 3.96 4.56 ,6 MEAN ,0 MEAN 9. 9 33 9.6 7.4 6.5 6.4 6.3 6.2 6.0 6.3 6.6 6.1 6.2 6.0 7.6 8.0 11 11 12 21 7.3 7.6 12 14 19 6.9 9.1 7.1 7.0 6.1 5.7 296.9 9.58 33 5.7 589 7.60 8.77 15 . 2 MAX 13 . 3 MAX 7.6 6.9 6.8 5.8 5.5 5.2 6.8 19 24 7.9 11 6.7 6.0 43 7.6 7.5 8.9 12 9.7 7.2 13 15 15 11 8.0 9.8 7.6 8.7 ___ ___ --- 303.2 10.8 43 5.2 601 8.59 8.95 470 MIN 231 MIN 15 7.8 6.9 6.8 6.4 6.4 6.3 6.0 65 33 77 106 96 45 17 27 24 16 13 13 12 12 13 12 14 15 29 15 13 14 11 753.6 24.3 106 6.0 1490 19.3 22.25 3.9 AC-FT 3.9 AC-FT 10 12 10 11 9.6 9.3 9.0 9.0 9.3 9.8 8.8 8.8 14 17 9.6 20 9.6 8.6 9.3 20 9.9 8.8 8.0 8.0 231 17 11 9.4 8.9 8.5 --- 545.2 18.2 231 8.0 1080 14.4 16.10 11000 9600 9.1 9.3 7.9 9.9 8.1 7.4 7.3 7.0 30 61 14 12 21 21 14 12 12 13 10 9.8 9.5 9.4 9.1 9.0 8.8 25 12 10 9.2 8.9 9.8 416.5 13.4 61 7.0 826 10.7 12.30 CFSM 12 CFSM 10 15 23 17 13 37 22 11 11 12 23 11 9.4 9.0 9.9 11 8.9 9.5 14 24 51 10 8.3 11 13 22 14 8.8 8.1 7.7 7.4 --- 452.0 15.1 51 7.4 897 12.0 13.34 .1 IN. 163, .5 IN. 142, 10 7.3 6.9 7.0 7.1 52 26 9.0 8.3 9.0 8.0 7.6 7.5 9.8 16 7.9 13 14 12 8.0 7.4 7.2 10 36 20 12 9.3 8.0 7.4 7.2 6.9 377.8 12.2 52 6.9 749 9.67 11.15 .79 .95 6.9 37 9.2 7.4 7.7 7.5 19 12 11 35 11 10 75 12 9.2 8.1 7.9 10 7.9 7.4 11 18 11 8.1 11 7.9 7.0 6.7 7.0 6.4 6.0 411.3 13.3 75 6.0 816 10.5 12.14 6.1 7.6 10 7.8 6.3 6.0 6.0 5.9 19 7.6 7.2 29 20 16 7.2 21 15 15 7.9 11 6.6 7.9 10 6.4 5.9 5.6 6.2 5.7 5.4 44--- 335.3 11.2 44 5.4 665 8.87 9.90 306 RIO BLANCO BASIN 50075000 RIO ICACOS NEAR NAGDABO, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS AUGUST 1981 TO CURRENT YEAR STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TORE (CFS) (UMHOS) (DEC C) OCT. 12 1357 NOV. 15 1215 DEC. 19 1452 JAN. 11 1226 JAN. 31 0924 MAR. 26 1254 9.96 11.0 4.46 7.24 5.92 14.9 63 56 62 68 61 56 23.5 22.0 21.5 21.0 20.0 21.0 DATE TIME APR. 19 0924 MAY 08 1144 JUNE 19 1057 JULY 18 0916 AUG. 29 1300 SEPT 27 1258 STREAMFLOW, INSTANTANEOUS (CFS) 8.46 7.34 9.65 9.91 6.45 7.34 SPECIFIC CON- TEMPERA- DUCTANCE TORE (UMHOS) (DEC C) 61 62 58 54 59 66 20.5 21.5 21.5 21.5 23.0 22.5 SURFACE-WATER STATION AND NUMBER QUALITY-OF-WATER STATION AND NUMBER WELL AND WELL NUMBER C A R I B E 2 J <S»(ilES T————-———I' 145 COo Figure 21.--Southeastern river basins the Rio Humacao to Rio Seco basins. 308 RIO HUMACAO BASIN 50081000 RIO HOMACAO AT LAS PIBDRAS, PR LOCATION.--Lat 18°10'27", long 65°52'11", Hydrologic unit 21010005, on left bank at downstream side of bridge on Highway 921, 0.6 mi (1.0 km) southeast of junction with Highway 30, 0.8 mi (1.3 km) downstream from Quebrada Blanca and 0.8 mi (1.3 km) south of Las Piedras. DRAINAGE AREA.--6.65 mi 3 (17.22 kma ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.—September 1958 to December 1967 (monthly discharge measurements), July 1974 to September 1977, October 1987 to current year. GAGE.--Water-stage recorder. Elevation of gage is 260 ft (79.2 m) , from topographic map. Prior to July 1974, crest-stage gage at different datum. July 1974 to September 1977 at site 90 ft (27 m) upstream at present datum. REMARKS.--Records fair except those above 1,000 ftVs (28.3 m3 /s), and estimated daily discharges, which are poor. Gage-height and precipitation satellite telemetry at station. AVERAGE DISCHARGE.--6 years (1975-77, 1988-90), 23.8 ftVs (0.674 m'/s) , 48.60 in/yr (1,234 mm/yr), 17,240 acre-ft/yr (21.3 hmVyr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 20,800 ft3/s (589 mVs) Sept. 6, 1960, gage height, 34.4 ft (10.485 m) , datum then in use, from floodmarks, and rating curve extended above 5,300 ftVs (150 m3/s) on basis of slope-area measurement of peak flow; minimun daily discharge, 2.2 ftVs (0.062 mVs) July 16, 1974. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,000 ftVs (28.3 m'/s) and maximum (*): Time Discharge (ftVs) (mVs) Gage height (ft) (m) Date Time Aug. 10 1100 *755 21.4 *3.97 1.210 Minimum discharge, 4.8 ftVs (0.136 m3/s) , July 3,4. Date Discharge (ftVs) (mVs) Gage height (ft) (m) DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES DAY NOV JAN MAR JUN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC- FT CFSM IN. CAL YR WTR YR 35 33 28 26 28 30 26 27 46 25 23 23 23 22 23 21 21 25 21 20 20 41 24 19 18 21 17 17 17 30 20 770 24.8 46 17 1530 3.74 4.31 1989 1990 18 17 16 17 25 17 16 27 32 21 17 16 16 15 15 15 15 15 15 17 16 15 15 15 14 16 15 14 14 14 --- 510 17.0 32 14 1010 2.56 2.85 TOTAL 8042. TOTAL 4417. 13 13 13 13 12 13 12 12 12 12 12 12 12 11 11 11 11 11 11 12 11 10 10 14 17 11 10 11 14 12 10 369 11.9 17 10 732 1.79 2.06 .2 MEAN .3 MEAN 15 18 11 9.3 8.7 8.7 8.7 8.9 9.0 9.4 10 9.2 12 8.9 8.7 8.4 8.9 8.1 8.9 32 12 9.5 9.2 11 10 12 10 11 9.8 9.4 9.9 335.6 10.8 32 8.1 666 1.63 1.88 22 . 0 MAX 12 . 1 MAX 9.1 12 9.4 9.0 8.7 8.4 9.6 11 11 10 9.7 9.3 8.7 10 11 12 12 13 9.5 12 19 14 14 16 e!2 ell 10 9.9 ___ ___ --- 311.3 11.1 19 8.4 617 1.67 1.74 450 MIN 174 MIN 10 10 9.7 9.2 9.0 8.8 8.6 8.3 8.6 8.9 8.8 9.4 11 22 11 12 11 9.0 8.7 9.7 9.6 8.7 8.7 8.2 8.3 8.4 8.6 10 9.5 11 10 8.9 8.7 21 8.4 7.4 7.1 6.8 6.6 6.6 6.5 6.6 7.2 10 7.1 6.6 6.3 6.3 7.3 6.6 6.0 6.0 5.5 5.5 5.5 16 21 10 8.6 7.9 7.7 --- 304.7 251.7 9.83 22 8.2 604 1.48 1.70 7.4 AC-FT 5.2 AC-FT 8.39 21 5.5 499 1.26 1.41 15950 8760 7.7 7.7 7.2 7.1 7.0 6.8 6.9 7.0 11 11 7.6 7.1 6.9 8.8 7.3 7.0 6.6 6.6 6.3 6.3 6.2 5.7 5.5 5.5 5.5 11 8.0 6.8 7.5 6.6 6.8 225.0 7.26 11 5.5 446 1.09 1.26 CFSM 3.31 CFSM 1.82 6.8 8.0 6.4 6.8 10 10 12 7.7 6.8 6.6 6.0 5.7 6.3 43 49 11 8.5 7.1 7.1 13 7.4 6.1 6.1 8.3 16 11 7.5 6.2 5.7 5.3 317.4 10.6 49 5.3 630 1.59 1.78 IN. 44 IN. 24 6.5 5.8 5.2 5.9 8.1 28 14 8.8 7.2 7.3 6.5 5.7 5.3 5.3 6.6 5.8 6.0 9.1 9.4 6.9 5.7 5.4 5.3 14 12 9.0 8.0 6.8 5.9 5.5 5.5 246.5 7.95 28 5.2 489 1.20 1.38 .99 .71 5.4 5.7 6.0 5.3 6.2 6.6 8.3 22 9.2 174 24 14 14 12 10 9.6 9.0 11 11 8.9 8.4 8.5 12 12 .11 8.8 7.6 7.6 13 7.8 6.9 475.8 15.3 174 5.3 944 2.31 2.66 6.8 6.8 7.7 14 8.0 7.1 6.6 6.8 9.6 12 7.4 8.4 25 22 11 9.8 10 11 9.8 8.5 8.0 7.4 7.4 7.4 7.4 7.1 7.0 7.3 13 20—— 300.3 10.0 25 6.6 596 1.51 1.68 e Estimated RIO HUMACAO BASIN 309 50081000 RIO HUMACAO AT LAS PIBDRAS, PR—Continued WATER QUALITY RECORDS PERIOD OF RECORD.-- OCTOBER 1989 TO SEPTEMBER 1990 STREAMFLOW, DATE TIME INSTANTANEOUS (CFS) OCT. NOV. DEC. JAN. FEB. 05 1112 15 1059 06 1253 16 1330 14 1223 MAR. 06 0953 22 14.7 12.6 8.98 10.1 9.00 SPECIFIC CON- TEMPERA- DUCTANCE TURE (UMHOS) (DEC C) 174 170 166 154 170 182 27.5 25.0 25.0 26.0 23.5 22.5 STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEC C) APR. 12 1014 MAY 21 1448 JUNE 20 1251 JULY 23 1441 AUG. 23 1137 SEPT 12 1035 6.44 6.05 14.4 5.48 8.55 8.34 180 181 170 190 197 193 24.5 29.5 27.5 29.5 27.0 25.0 310 RIO HUMACAO BASIN 50082000 RIO HUMACAO AT HIGHWAY 3 AT HUMACAO, PR WATER-QUALITY RECORDS LOCATION.--Lat 18 08'49 M , long 65 49'37", at bridge on Highway 3, 300 ft (91 m) downstream from Quebrada Mariana, and 0.4 mi (0.6 km) south of Humacao. DRAINAGE AREA.--17.3 mi» (44.8 km»). PERIOD OF RECORD.--Water years 1958-66, 1969 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 18. .. DEC 15. .. FEB 1990 14. .. APR 26. . . JUN 21. . . AUG 17. .. TIME 1115 0705 0745 0800 0920 0945 DIS- CHARGE, INST. CUBIC FEET PER SECOND 54 18 19 38 13 14 SPE- CIFIC CON- DUCT- ANCE (US/CM) 262 329 336 288 336 451 PH (STAND- ARD UNITS) 7.40 7.40 7.00 7.50 7.10 7.50 TEMPER- ATURE WATER (DEC C) 29.0 21.0 22.5 23.5 28.0 28.0 TUR- BID- ITY (NTU) 47 10 4.6 12 3.0 4.5 OXYGEN, DIS- SOLVED (MG/L) 7.0 7.6 4.4 7.2 5.9 6.0 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 89 85 50 84 74 75 OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 32 18 25 29 20 23 COLI- FORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) K180000 K110000 K76000 K89000 250000 440000 STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) 21000 39000 30000 46000 82000 130000 DATE OCT 1989 18. .. DEC 15. .. FEB 1990 14. .. APR 26. . . JUN 21. .. AUG 17. .. HARD- NESS TOTAL (MG/L AS HARD- NESS NONCARB CALCIUM WH WAT TOT FLD DIS- SOLVED MG/L AS (MG/L CACO3) CACO3 MAGNE- SIUM, SODIUM, DIS- DIS- SOLVED SOLVED (MG/L (MG/L AS CA) AS MG) AS NA) 73 0 20 5.7 20 79 0 19 6.3 22 100 2 29 6.7 29 ALKA- SODIUM POTAS- LINITY AD- SIUM, WAT WH SORP- DIS- TOT FET SULFIDE TION SOLVED FIELD TOTAL RATIO (MG/L MG/L AS (MG/L AS K) 2.9 CACO3 2.6 75 92 98 61 87 98 <0.5 CHLO- SULFATE RIDE, DIS- DIS- SOLVED SOLVED (MG/L 12 15 (MG/L AS S) AS SO4) AS CL) 23 19 42 SOLIDS, RESIDUE DATE OCT 1989 18. .. DEC 15. .. FEB 1990 14. .. APR 26.. . JUN 21. . . AUG 17.. . FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.10 -- -- 0.10 -- 0.60 SILICA, DIS- SOLVED (MG/L AS SI 02) 31 -- -- 35 -- 35 SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 158 '-- -- 162 -- 219 SOLIDS, DIS- SOLVED (TONS PER DAY) 22.8 -- -- 16.9 -- 8.43 TOTAL AT 105 DEC. C, SUS- PENDED (MG/L) 86 10 13 16 18 18 NITRO- GEN, NITRATE TOTAL (MG/L AS N) 0.47 0.90 0.60 0.37 0.37 0.39 NITRO- GEN, NITRITE TOTAL (MG/L AS N) 0.03 0.10 0.10 0.03 0.03 0.01 NITRO- GEN, NO2+NO3 TOTAL (MG/L AS N) 0.50 1.0 0.70 0.40 0.40 0.40 NITRO- GEN, AMMONIA TOTAL (MG/L AS N) 0.22 0.40 0.46 0.44 0.83 1.20 NITRO- GEN, ORGANIC TOTAL (MG/L AS N) 0.58 0.40 0.34 0.66 0.47 1.0 K = non-ideal count RIO HUMACAO BASIN 50082000 RIO HOMACAO AT HIGHWAY 3 AT HUMACAO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 311 DATE OCT 1989 18.. . DEC 15.. . FEE 1990 14.. . APR 26.. . JUN 21.. . AUG 17.. . DATE OCT 1989 18. .. DEC 15. .. FEE 1990 14. .. APR 26. . . JUN 21. . . AUG 17.. . NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.80 0.80 0.80 1.1 1.3 2.2 IRON, TOTAL RECOV- ERABLE (UG/L AS FB) 4700 -- -- 24000 -- -- NITRO- GEN, TOTAL (MG/L AS N) 1.3 1.8 1.5 1.5 1.7 2.6 LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) 10 -- -- 11 -- -- NITRO- GEN, TOTAL (MG/L AS N03) 5.8 8.0 6.6 6.6 7.5 12 MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) 250 -- -- 430 -- -- PHOS- PHORUS ARSENIC TOTAL TOTAL (MG/L (UG/L AS P) AS AS) 0.23 <1 0.31 0.38 0.29 <1 0.39 0.43 MERCURY TOTAL SELE- RECOV- NIUM, BRABLE TOTAL (UG/L (UG/L AS HG) AS SB) <0.10 <1 __ __ <0.10 <1 -_ __ BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 -- -- 400 -- - - SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) <1 -- -- <1 -- -- CHRO- BORON, CADMIUM MIUM, TOTAL TOTAL TOTAL RECOV- RECOV- RECOV- ERABLE BRABLB BRABLB (UG/L (UG/L (UG/L AS B) AS CD) AS CR) <10 <1 <1 __ __ 60 <1 57 __ - - - - - - ZINC, TOTAL RECOV- CYANIDE BRABLB TOTAL PHENOLS (UG/L (MG/L TOTAL AS ZN) AS CN) (UG/L) 20 <0.010 14 -_ __ 70 <0.010 1 __ __ COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) 10 -- -- 830 -- - - METHY- LENE BLUB ACTIVE SUB- STANCE (MG/L) 0.02 -- -- <0.01 -- -- 312 RIO GOAYANES BASIN 50083500 RIO GDAYANES AT YABUCOA, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°03'33", long 65°54'03", at bridge on Highway 182, 1.4 mi (2.2 km) west-northwest of Yabucoa plaza. DRAINAGE AREA.--17.2 mi 1 (44.6 km 1 ). PERIOD OF RECORD.--Water years 1958-62, 1968-70, 1980 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 18. .. DEC 13. .. FEB 1990 12. .. APR 24. .. JUN 20. . . AUG 16. . . TIME 0905 1025 1105 1130 0905 0845 DIS- CHARGE, INST. CUBIC FEET PER SECOND 50 21 22 16 68 32 SPE- CIFIC CON- DUCT- ANCE (US/CM) 170 173 175 170 154 170 PH (STAND- ARD UNITS) 7.20 7.10 7.00 7.30 7.60 7.40 TEMPER- ATURE WATER (DEC C) 24.5 22.5 23.5 25.0 25.5 25.5 TUR- BID- ITY (NTU) 6.5 3.9 6.0 7.0 33 11 OXYGEN, DIS- SOLVED (MG/L) 7.3 8.3 7.5 8.0 6.9 7.2 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 87 94 86 95 83 86 OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) <10 11 13 <10 24 10 COLI- FORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) K730 370 540 300 K12000 500 STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) K1900 250 420 3800 24000 730 OCT 1989 18. .. DEC 13. .. FEB 1990 12. .. APR 24. . . JUN 20. .. AUG 16. . . HARD- NESS NONCARB WH WAT TOT FLD HARD- NESS TOTAL (MG/L AS CAC03) CAC03 51 53 51 CALCIUM DIS- SOLVED MG/L AS (MG/L 13 13 13 MAGNE- SIUM, DIS- SOLVED (MG/L SODIUM, DIS- SOLVED (MG/L AS CA) AS MG) AS NA) 4.4 15 4.9 17 4.4 15 SODIUM AD- SORP- TION RATIO POTAS- SIUM, DIS- SOLVED AS K) 0.9 1.5 1 1.1 0.9 2.5 ALKA- LINITY WAT WH TOT FET FIELD SULFIDE TOTAL (MG/L MG/L AS (MG/L CAC03 59 62 62 66 54 61 CHLO- SULFATE RIDE, DIS- DIS- SOLVED SOLVED (MG/L (MG/L AS S) AS S04) AS CL) <0.5 4.0 11 <0.5 4.9 18 3.0 16 SOLIDS, RESIDUE DATE OCT 1989 18.. . DEC 13.. . FEB 1990 12. .. APR 24. . . JUN 20. . . AUG 16. .. FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.10 -- -- 0.10 -- <0.10 SILICA, DIS- SOLVED (MG/L AS SI 02) 37 -- -- 39 -- 35 SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 121 -- -- 138 -- 125 SOLIDS, DIS- SOLVED (TONS PER DAY) 16.5 -- -- 5.92 -- 11 TOTAL AT 105 DEC. C, SUS- PENDED (MG/L) 15 1 16 10 78 28 NITRO- GEN, NITRATE TOTAL (MG/L AS N) 0.39 — 0.19 0.19 0.28 0.19 NITRO- GEN, NITRITE TOTAL (MG/L AS N) 0.01 <0.01 0.01 0.01 0.02 0.01 NITRO- GEN, N02+N03 TOTAL (MG/L AS N) 0.40 0.30 0.20 0.20 0.30 0.20 NITRO- GEN, AMMONIA TOTAL (MG/L AS N) 0.04 0.03 0. 02 0.03 0.05 0.06 NITRO- GEN, ORGANIC TOTAL (MG/L AS N) 0.26 -- 0.18 0.17 1.2 0.54 non-ideal count RIO GDAYANES BASIN 50083500 RIO GOAYANES AT YABUCOA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 313 DATE OCT 1989 18.. . DEC 13.. . FEB 1990 12. .. APR 24. .. JUN 20. . . AUG 16.. . DATE OCT 1989 18. .. DEC 13.. . FEB 1990 12. .. APR 24. .. JUN 20.. . AUG 16. .. NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.30 <0.20 0.20 0.20 1.3 0.60 IRON, TOTAL RECOV- ERABLE (UG/L AS FE) 1800 -- -- 1600 -- -- NITRO- GEN, TOTAL (MG/L AS N) 0.70 -- 0.40 0.40 1.6 0.80 LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) 2 -- -- 17 -_ -- NITRO- GEN, TOTAL (MG/L AS NO3) 3.1 -- 1.8 1.8 7.1 3.5 MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) 110 -- -- 130 -- -- PHOS- PHORUS TOTAL (MG/L AS P) 0.05 0.05 0.04 0.06 0.14 0.06 MERCURY TOTAL RECOV- ERABLE (UG/L AS HG) <0.10 -- -- <0.10 _- _- BARIUM, TOTAL ARSENIC RECOV- TOTAL ERABLE (UG/L (UG/L AS AS) AS BA) <1 <100 -_ __ <1 <100 -_ - - - - SILVER, SELE- TOTAL NIUM, RECOV- TOTAL ERABLE (UG/L (UG/L AS SE) AS AG) <1 <1 -_ -_ <1 <1 __ __ BORON, TOTAL RECOV- ERABLE (UG/L AS B) <10 -- -- 20 -- - - ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) <10 -- -- <10 -- -- CHRO- CADMIUM MIUM, TOTAL TOTAL RECOV- RECOV- ERABLE ERABLE (UG/L (UG/L AS CD) AS CR) <1 <1 __ __ <1 <1 __ _ _ _ _ CYANIDE TOTAL PHENOLS (MG/L TOTAL AS CN) (UG/L) <0.010 2 -_ __ <0.010 2 __ __ COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) 10 -- -- <10 -- — — METHY- LENE BLUE ACTIVE SUB- STANCE (MG/L) 0. 03 -- -- 0.02 -- -- PESTICIDE ANALYSES DATE JUN 1990 20. . . TIME 0905 PCB, TOTAL (UG/L) ALDRIN, TOTAL (UG/L) <0.010 CHLOR- DANE, TOTAL (UG/L) ODD, TOTAL (OG/L) DDE, TOTAL (UG/L) DOT, TOTAL (UG/L) DI- AZINON, TOTAL (UG/L) DI- ELDRIN TOTAL (UG/L) ENDO- SULFAN, TOTAL (OG/L) <0.010 <0.010 <0.01 <0.010 <0.010 DATE JUN 1990 20.. . ENDRIN, TOTAL (UG/L) <0.010 ETHION, TOTAL (UG/L) <0.01 HEPTA- CHLOR, TOTAL (UG/L) <0.010 HEPTA- CHLOR EPOXIDE TOTAL (UG/L) <0.010 LINDANE TOTAL (UG/L) <0.010 MALA- THION, TOTAL (UG/L) <0.01 METH- OXY- CHLOR, TOTAL (UG/L) <0.01 METHYL PARA- THION, TOTAL (UG/L) <0.01 METHYL TRI- THION, TOTAL (UG/L) <0.01 MI REX, TOTAL (UG/L) <0.01 DATE JUN 1990 20.. . PARA- THION, TOTAL (UG/L) <0.01 NAPH- THA- LENES, POLY- CHLOR. TOTAL (UG/L) <0.10 PER- THANE TOTAL (UG/L) <0.1 TOX- APHENE, TOTAL (UG/L) <1 TOTAL TRI- THION (UG/L) <0.01 2, 4-D, TOTAL (UG/L) <0.01 2,4, 5-T TOTAL (UG/L) <0.01 2, 4-DP TOTAL (UG/L) <0.01 SILVEX, TOTAL (UG/L) <0.01 RIO GDAYANBS BASIN 50086500 RIO GOAYANES ABOVE MOOTH AT PLAYA DE GOAYANES, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°03'45", long 65°49'42", at old railroad crossing, 0.2 mi (0.3 km) from mouth, 0.4 mi (0.6 km) west of Playa de Guayanes, and 3.5 mi (5.6 km) northeast of Yabucoa plaza. DRAINAGE AREA.--34.0 mi ' (88.1 km 2 ). PERIOD OF RECORD.--Water years 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 24. . . DEC 14. .. FEB 1990 13. .. APR 25. . . JUN 21. . . AUG 16. .. TIME 1130 1040 1135 0830 0735 1020 DIS- CHARGE, INST. CUBIC FEET PER SECOND 67 30 15 23 50 56 SPE- CIFIC CON- DUCT- ANCE (US/CM) 182 180 185 172 167 190 PH (STAND- ARD UNITS) 7.40 7.40 7.40 7.20 7.00 7. 60 TEMPER- ATURE WATER (DEC C) 27.0 23.5 25.0 24.5 26.0 27.5 TUR- BID- ITY (NTU) 9.4 9.7 10 17 24 12 OXYGEN, DIS- SOLVED (MG/L) 7.8 7.4 6.5 6.0 7.1 6.6 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 96 85 77 70 83 82 OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 21 15 14 24 20 14 COLI- FORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) 420 250 520 4000 2200 K1200 STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) K140 370 400 9600 2700 2100 OCT 1989 24. . . DEC 14. .. FEB 1990 13. .. APR 25. . . JUN 21. . . AUG 16. . . TOT FLD HARD- NESS TOTAL (MG/L AS CAC03) CAC03 48 37 54 HARD- NESS NONCARB CALCIUM WH WAT DIS- SOLVED MG/L AS (MG/L 12 MAGNE- SIUM, SODIUM, DIS- DIS- SOLVED SOLVED (MG/L (MG/L AS CA) AS MG) AS NA) 4.4 16 9.5 3.3 13 4.7 17 SODIUM AD- SORP- TION RATIO POTAS- SIUM, DIS- SOLVED AS K) 1 1.4 1 3.1 1 1.9 ALKA- LINITY WAT WH TOT FET FIELD SULFIDE TOTAL (MG/L MG/L AS (MG/L CAC03 60 61 62 54 51 70 AS S) <0.5 CHLO- SULFATE RIDE, DIS- DIS- SOLVED SOLVED (MG/L (MG/L AS S04) AS CL) 5.0 13 9.2 12 3.8 21 SOLIDS, RESIDUE DATE OCT 1989 24. . . DEC 14. .. FEB 1990 13. .. APR 25. .. JUN 21.. . AUG 16. .. FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.10 -- -- <0.10 -- <0.10 SILICA, DIS- SOLVED (MG/L AS SI02) 38 -- -- 28 -- 36 SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) • 126 -- -- 100 -- 140 SOLIDS, DIS- SOLVED (TONS PER DAY) 22.8 -- -- 6.33 -- 21.6 TOTAL AT 105 DEG. C, SUS- PENDED (MG/L) 12 17 15 44 56 29 NITRO- GEN, NITRATE TOTAL (MG/L AS N) -- -_ -- -- 0.28 0.29 NITRO- GEN, NITRITE TOTAL (MG/L AS N) <0.01 <0.01 <0.01 0.01 0.02 0.01 NITRO- GEN, N02+N03 TOTAL (MG/L AS N) 0.40 0.30 0.30 <0.10 0.30 0.30 NITRO- GEN, AMMONIA TOTAL (MG/L AS N) 0.03 0.02 0.01 <0.01 0.06 0.02 NITRO- GEN, ORGANIC TOTAL (MG/L AS N) -- -- -- -- 0.44 0.68 K = non-ideal count RIO GUAYANES BASIN 50086500 RIO GUAYANES ABOVE MOUTH AT PLAYA DE GUAYANES, PR—Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 315 DATE OCT 1989 24. .. DEC 14.. . FBB 1990 13. .. APR 25.. . JUN 21.. . AUG 16.. . DATE OCT 1989 24. .. DEC 14.. . FBB 1990 13.. . APR 25.. . JUN 21. . . AUG 16.. . NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) <0.20 <0.20 <0.20 0.50 0.50 0.70 IRON, TOTAL RECOV- ERABLE (UG/L AS FB) NITRO- GEN, TOTAL (MG/L AS N) -- -- -- -- 0.80 1.0 LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) NITRO- GEN, TOTAL (MG/L AS NO3) -- -- -- -- 3.5 4.4 MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MM) PHOS- PHORUS TOTAL (MG/L AS P) 0.06 0.05 0.08 0.01 0.12 0.14 MERCURY TOTAL RECOV- ERABLE (UG/L AS HG) ARSENIC TOTAL (UG/L AS AS) <1 -- -- <1 -- -- SELE- NIUM, TOTAL (UG/L AS SE) BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 -- -- 100 — -- SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) BORON, TOTAL RECOV- ERABLE (UG/L AS B) <10 -- -- 50 -- -- ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- <1 -- -- CYANIDE TOTAL (MG/L AS CN) CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) <1 -- -- 3 -- -- PHENOLS TOTAL (UG/L) COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) 10 - — 10 — -- METHY- LENE BLUB ACTIVE SUB- STANCE (MG/L) 1500 3500 80 <0.10 <0.10 30 <0.010 <0.010 0.02 0.06 316 RIO MAUNABO BASIN 50091000 RIO MAUNABO AT MAUNABO, PR WATER-QUALITY RECORDS LOCATION.—Lat 18°00'24" / long 65°54'19", at bridge on Highway 3, 0.4 mi (0.6 km) southwest of Maunabo plaza, and 1.3 mi (2.1 km) upstream from mouth. DRAINAGE AREA.--12.4 mi a (32.1 km1 ). PERIOD OF RECORD.--Water years 1958-66, 1975 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 24. . . DEC 13. .. FEB 1990 12. .. APR 24. . . JUN 13. .. AUG 13. .. TIME 0920 0825 0910 0940 0955 1050 DIS- CHARGE, INST. CUBIC FEET PER SECOND 21 10 12 2.7 2.3 40 SPE- CIFIC CON- DUCT- ANCE (US/CM) 250 281 250 455 402 188 PH (STAND- ARD UNITS) 7.30 7.40 7.10 7.40 7.20 7.60 TEMPER- ATURE WATER (DBG C) 25.0 22.0 23.0 26.0 29.0 28.0 TUR- BID- ITY (NTU) 2.7 32 1.0 30 50 75 OXYGEN, DIS- SOLVED (MG/L) 7.6 7.5 7.0 7.2 7.1 6.7 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 91 84 80 88 90 84 OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 20 13 29 18 18 30 COLI- FORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) 2600 K1300 590 K1100 K1400 35000 STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) 420 530 380 320 350 24000 OCT 1989 24. .. DEC 13. .. FEB 1990 12. .. APR 24. . . JUN 13. .. AUG 13. .. HARD- NESS TOTAL (MG/L AS HARD- NESS NONCARB WH WAT TOT FLD CALCIUM DIS- SOLVED MG/L AS (MG/L CACO3) CACO3 MAGNE- SIUM, DIS- SODIUM, DIS- SOLVED SOLVED (MG/L (MG/L AS CA) AS MG) AS NA) 73 0 18 6.9 20 130 0 31 13 41 56 0 13 5.6 17 SODIUM AD- SORP- TION RATIO POTAS- SIUM, DIS- SOLVED ALKA- LINITY WAT WH TOT FET FIELD SULFIDE TOTAL SULFATE DIS- SOLVED (MG/L MG/L AS (MG/L AS K) 1.3 3.9 2.0 CACO3 80 95 87 88 100 59 (MG/L CHLO- RIDE, DIS- SOLVED (MG/L AS S) AS SO4) AS CL) <0.5 10 16 <0.5 24 52 7.8 19 DATE OCT 1989 24.. . DEC 13.. . FEB 1990 12.. . APR 24.. . JUN 13. .. AUG 13. .. FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.10 -- -- 0.30 -- <0.10 SILICA, DIS- SOLVED (MG/L AS SIO2) 39 -- -- 45 -- 28 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 159 -- -- 280 -- 128 SOLIDS, DIS- SOLVED (TONS PER DAY) 9.12 -- -- 2.02 -- 14. 1 RESIDUE TOTAL AT 105 DEC. C, SUS- PENDED (MG/L) 17 56 5 89 61 130 NITRO- GEN, NITRATE TOTAL (MG/L AS N) 0.39 0.28 0.19 1.67 0.28 0.37 NITRO- GEN, NITRITE TOTAL (MG/L AS N) 0.01 0.02 0.01 0.13 0.12 0.03 NITRO- GEN, N02+N03 TOTAL (MG/L AS N) 0.40 0.30 0.20 1.8 0.40 0.40 NITRO- GEN, AMMONIA TOTAL (MG/L AS N) 0.03 1.0 0.02 0.96 0.84 0.04 NITRO- GEN, ORGANIC TOTAL (MG/L AS N) 0.47 0.50 0.48 0.34 0.46 2.3 K = non-ideal count RIO MAUNABO BASIN 50091000 RIO MAUNABO AT MAUNABO, PR—Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 317 DATE OCT 1989 24.. . DEC 13.. . FEB 1990 12.. . APR 24.. . JUN 13.. . AUG 13.. . DATE OCT 1989 24. .. DEC 13.. . FEB 1990 12.. . APR 24. .. JUN 13. .. AUG 13. .. NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.50 1.5 0.50 1.3 1.3 2.3 IRON, TOTAL RECOV- ERABLE (UG/L AS FE) 790 -- -- 4700 -- -- NITRO- GEN, TOTAL (MG/L AS N) 0.90 1.8 0.70 3.1 1.7 2.7 LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) 4 -- -- 1 -- -- NITRO- GEN, TOTAL (MG/L AS NO3) 4.0 8.0 3.1 14 7.5 12 MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MM) 60 _- -- 230 -- PHOS- PHORUS ARSENIC TOTAL TOTAL (MG/L (UG/L AS P) AS AS) 0.07 <1 0.24 0.16 1.6 1 0.81 0.11 MERCURY TOTAL SELE- RECOV- NIUM, ERABLE TOTAL (UG/L (UG/L AS HG) AS SB) <0.10 <1 __ __ <0.10 <1 -_ -- BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 -- -- 100 -- -- SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) <1 __ -- <1 -- -- CHRO- BORON, CADMIUM MIUM, TOTAL TOTAL TOTAL RBCOV- RECOV- RECOV- ERABLE ERABLE BRABLB (UG/L (UG/L (UG/L AS B) AS CD) AS CR) 30 <1 <1 __ __ 40 <1 <1 __ - - - - — - ZINC, TOTAL RBCOV- CYANIDE BRABLB TOTAL PHENOLS (UG/L (MG/L TOTAL AS ZN) AS CN) (UG/L) <10 <0.010 <1 __ __ 20 <0.010 <1 __ __ COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) <10 -- -- <10 -- -- METHY- LENE BLUE ACTIVE SUB- STANCE (MG/L) 0.03 -- -- 0.12 -- -- O -f Q 0 ' ° RIO CHICO BASIN 50091800 RIO CHICO AT PROVIDENCIA, PR WATER-QUALITY RECORDS LOCATION.--Lat 17°59'16", long 66°00'18", at flat low bridge 200 ft (61 m) south of Highway above mouth, and 1.5 mi (2.4 km) southeast of Patillas plaza. DRAINAGE AREA.--4.9 mi* (12.8 km1 ). PERIOD OP RECORD.--Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 3, 0.5 (0.8 km) DATE OCT 1989 16. .. DEC 14. .. FEB 1990 13. .. APR 24. .. JUN 13. .. AUG 13. .. DATE OCT 1989 16... DEC 14. .. PEB 1990 13. .. APR 24. . . JUN 13. .. AUG 13. .. TIME 0940 0820 0905 0830 0835 0915 HARD- NESS TOTAL (MG/L AS CACO3 ) 110 -- -- 130 -- 120 DIS- CHARGE, INST. CUBIC FEET PER SECOND 3.4 2.0 1.1 5.4 1.0 22 HARD- NESS NONCARB WH WAT TOT FLD MG/L AS CACO3 0 -- -- 0 -- 3 SPE- CIFIC CON- DUCT- ANCE (US/CM) 407 588 606 668 598 245 CALCIUM DIS- SOLVED (MG/L AS CA) 26 -- -- 34 -- 28 PH (STAND- ARD UNITS) 7.60 7.40 7.50 7.80 7.00 7.90 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 11 -- -- 12 -- 13 TEMPER- ATURE WATER (DEG C) 26.5 26.0 24.5 30.5 29.0 26.0 SODIUM, DIS- SOLVED (MG/L AS NA) 42 -_ -- 76 -- 30 TUR- BID- ITY (NTU) 1.8 4.0 35 10 4.1 11 SODIUM AD- SORP- TION RATIO 2 -- -- 3 _- 1 OXYGEN, DIS- SOLVED (MG/L) 7.1 6.2 6.1 5.0 2.5 6.2 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 3.1 -- -- 12 -- 5.0 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 88 75 72 66 32 75 ALKA- LINITY WAT WH TOT PET FIELD MG/L AS CACO3 130 140 160 250 120 74 OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 16 55 38 67 37 23 SULFIDE TOTAL (MG/L AS S) <0.5 -- -- <0.5 -- -- COLI- FORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) K130 260 K100 2200 5600 42000 SULFATE DIS- SOLVED (MG/L AS SO4) 17 -- -- 42 -- 17 STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) K120 K170 390 K160 11000 40000 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 30 -- -- 100 -- 34 DATE OCT 1989 16.. . DEC 14. .. FEB 1990 13. .. APR 24. .. JUN 13... AUG 13. .. FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.20 -- -- 0.20 -- 0.10 SILICA, DIS- SOLVED (MG/L AS SIO2) 31 -- -- 35 -- 33 SOLIDS, SUM OF CONSTI - TUENTS, DIS- SOLVED (MG/L) 238 -- -- 376 -- 232 SOLIDS, DIS- SOLVED (TONS PER DAY) 2.22 -- -- 5.47 -- 14 RESIDUE TOTAL AT 105 DEG. C, SUS- PENDED (MG/L) <1 14 13 10 <1 16 NITRO- GEN, NITRATE TOTAL (MG/L AS N) 1.38 4.87 1.91 8.16 3.78 0.75 NITRO- GEN, NITRITE TOTAL (MG/L AS N) 0.02 0.23 0.09 0.14 0.02 0.05 NITRO- GEN, NO2+NO3 TOTAL (MG/L AS N) 1.4 5.1 2.0 8.3 3.8 0.80 NITRO- GEN, AMMONIA TOTAL (MG/L AS N) 0.11 0.30 0.28 0.11 0.07 0.09 NITRO- GEN, ORGANIC TOTAL (MG/L AS N) 0.69 2.5 1.7 3.6 1.7 1.3 K = non-ideal count RIO CHICO BASIN 50091800 RIO CHICO AT PROVIDENCIA, PR—Continued WATER-QOALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 319 DATE OCT 1989 16. .. DEC 14. .. FEB 1990 13.. . APR 24.. . JON 13.. . AOG 13. .. DATE OCT 1989 16. .. DEC 14 ... FEB 1990 13. .. APR 24. .. JUN 13. .. AOG 13. .. NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.80 2.8 2.0 3.7 1.8 1.4 IRON, TOTAL RECOV- ERABLE (OG/L AS FE) 210 -- -- 240 -- -- NITRO- GEN, TOTAL (MG/L AS N) 2.2 7.9 4.0 12 5.6 2.2 LEAD, TOTAL RECOV- ERABLE (OG/L AS PB) 5 -- -- 6 -- -- NITRO- GEN, TOTAL (MG/L AS N03) 9.7 35 18 53 25 9.7 MANGA- NESE, TOTAL RECOV- ERABLE (OG/L AS MM) 40 -- -- 30 -- -- PHOS- PHORUS ARSENIC TOTAL TOTAL (MG/L (OG/L AS P) AS AS) 1.5 <1 4.1 4.7 8.3 1 7.3 0.60 MERCURY TOTAL SELE- RECOV- NIOM, ERABLE TOTAL (OG/L (OG/L AS HG) AS SE) 0.20 <1 __ __ 0.10 <1 -- __ BARIUM, TOTAL RECOV- ERABLE (OG/L AS BA) <100 -- -- <100 -- - - SILVER, TOTAL RECOV- ERABLE (OG/L AS AG) <1 -- -- <1 -- -- CHRO- BORON, CADMIUM MIUM, TOTAL TOTAL TOTAL RECOV- RECOV- RECOV- ERABLE ERABLE ERABLE (OG/L (OG/L (OG/L AS B) AS CD) AS CR) 20 <1 <1 __ -- 180 <1 1 __ - - - - -- ZINC, TOTAL RECOV- CYANIDE ERABLE TOTAL PHENOLS (OG/L (MG/L TOTAL AS ZN) AS CN) (OG/L) 10 <0.010 2 __ __ 40 <0.010 3 __ __ COPPER, TOTAL RECOV- ERABLE (OG/L AS CO) <10 -- -- 20 -- " METHY- LENE BLOB ACTIVE SUB- STANCE (MG/L) 0.10 -- -- 0.28 -- -- 320 RIO GRANDE DE PATILLAS BASIN 50092000 RIO GRANDE DE PATILLAS NEAR PATILLAS, PR LOCATION.--Lat 18°02'04" / long 66°01'58", Hydrologic Unit 21010004, on left bank, at foot bridge, off Highway 184, 1.2 mi (1.9 km) upstream from Lago Patillas Dam and 2.2 mi (3.5 km) northwest of Patillas. DRAINAGE AREA.--18.3 mi j (47.4 km')• WATER-DISCHARGE RECORDS PERIOD OF RECORD.—February 1959 to October 1965 (annual low-flow and occasional measurements only), January 1966 to current year. GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 235 ft (72 m), from topographic map. REMARKS.--Records fair. Gage-height and precipitation satellite telemetry at station. AVERAGE DISCHARGE.--24 years (1967-90), 59.8 ftVs (1.694 m'/s), 44.38 in/yr (1,127 mm/yr), 43,320 acre-ft/yr (53.4 hmVyr); median of yearly mean discharges, 60 ft'/s (1.70 mVs), 43,500 acre-ft/yr (54 hmVyr) . EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 14,800 ft3/s (419 mVs), Sept. 16, 1975, gage height, 12.45 ft (3.795 m), from rating curve extended above 250 ft'/s (7.08 m'/s) on basis of slope-area measurement of peak flow; minimum discharge, 4.6 ftVs (0.130 mVs), May 13-16, 1968. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 2,500 ftVs (70.8 mVs) and maximum (*): Discharge Time (ftVs) (m'/s) Gage height (ft) (m) Date June 14 1610 *1,750 49.6 *7.73 2.356 Minimum discharge, 8.1 ft3 /s (0.229 m3/s). May 22-26. Date Discharge Time (ft'/s) (m'/s) Gage height (ft) (m) DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES DAY NOV DEC JAN APR MAY JUN AUG SEP 1 66 2 61 3 57 4 77 5 68 6 56 7 51 8 47 9 44 10 39 11 37 12 36 13 35 14 33 15 34 16 33 17 30 18 29 19 28 20 28 21 28 22 26 23 26 24 25 25 26 26 24 27 23 28 22 29 22 30 24 31 23 TOTAL 1158 MEAN 37.4 MAX 77 MIN 22 AC-FT 2300 CFSM 2.04 IN. 2.35 CAL YR 1989 WTR YR 1990 22 21 19 19 28 22 22 24 23 21 20 18 18 18 17 17 18 19 18 18 17 16 15 15 15 15 15 15 14 14 --- 553 18.4 28 14 1100 1.01 1.12 TOTAL 16163 TOTAL 10097. 14 14 14 14 14 14 14 13 13 13 13 13 13 13 13 12 12 12 13 13 12 12 12 12 12 12 12 13 13 14 15 403 13.0 15 12 799 .71 .82 MEAN ,8 MEAN 16 20 27 16 13 13 13 13 13 13 12 11 9.8 9.8 9.7 9.1 10 11 20 39 23 16 14 15 32 62 46 36 30 25 19 616.4 19.9 62 9.1 1220 1.09 1.25 44.3 MAX 27.7 MAX 17 16 15 13 12 12 11 16 19 18 17 14 13 22 18 15 18 20 20 20 24 28 28 95 26 20 17 15 ___ _-_ --- 579 20.7 95 11 1150 1.13 1.18 1040 MIN 268 MIN 16 15 13 13 12 12 11 11 12 13 11 15 22 92 27 23 22 16 14 14 13 13 17 13 12 12 13 13 13 12 12 527 11 11 11 12 12 11 10 10 10 9.3 9.2 9.0 25 16 12 17 13 13 12 11 11 10 10 10 10 19 19 13 11 11--- 368.5 17.0 12.3 92 25 11 9.0 1050 .93 1.07 10 8.1 731 .67 .75 AC-FT 32060 AC-FT 20030 12 12 11 11 11 11 11 12 89 155 40 17 13 14 13 11 14 11 9.9 9.2 8.8 8.6 8.1 8.1 8.1 8.8 9.8 9.5 11 11 13 591.9 19.1 155 8.1 1170 1.04 1.20 CFSM 2, CFSM 1. 12 15 12 18 16 25 14 10 80 17 13 10 11 268 136 58 34 23 20 27 27 31 35 57 154 73 47 37 33 32 --- 1345 44.8 268 10 2670 2.45 2.73 .42 IN. 32. .51 IN. 20, 34 33 27 25 27 174 88 50 35 37 45 40 52 64 81 67 57 90 95 54 42 34 28 33 91 129 67 45 36 32 28 1740 56.1 174 25 3450 3.07 3.54 ,86 .53 26 24 24 23 38 26 28 50 34 168 82 47 45 35 30 27 24 24 22 19 18 17 20 19 20 23 17 154 67 36 27 1214 39.2 168 17 2410 2.14 2.47 23 22 21 21 18 17 17 19 19 19 16 29 24 21 25 29 30 42 35 22 19 18 25 36 39 82 41 58 91 124 --- 1002 33.4 124 16 1990 1.83 2.04 RIO GRANDE DE PATILLAS BASIN 50092000 RIO GRANDE DE PATILLAS NEAR PATILLAS, PR—Continued (National stream-quality accounting network station) WATER-QUALITY RECORDS PERIOD OP RECORD.--Water years 1960 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 321 DATE OCT 1989 10. . . JAN 1990 05. . . APR 09. . . JUL 06. . . DATE OCT 1989 10. . . JAN 1990 05. . . APR 09. . . JUL 06. . . DATE OCT 1989 10. . . JAN 1990 05. .. APR 09. .. JUL 06. . . DATE OCT 1989 10. .. JAN 1990 05. . . APR 09. . . JUL 06. .. K=non- ideal TIME 1035 0850 0950 1045 HARD- NESS NONCARB WH WAT TOT PLD MG/L AS CACO3 0 0 0 0 SOLIDS, RESIDUE AT 180 DEC. C DIS- SOLVED (MG/L) 90 121 119 60 ALUM- INUM, DIS- SOLVED (UG/L AS AL) 20 10 20 210 count DIS- CHARGE, INST. CUBIC FEET PER SECOND 40 13 10 594 CALCIUM DIS- SOLVED (MG/L AS CA) 11 13 12 5.0 SOLIDS, SUM OP CONSTI- TUENTS, DIS- SOLVED (MG/L) 108 121 116 55 ARSENIC DIS- SOLVED (UG/L AS AS) <1 <1 <1 3 SPE- CIFIC CON- DUCT- ANCE (US/CM) 161 189 175 184 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 5.3 6.0 5.6 2.0 SOLIDS, DIS- SOLVED (TONS PER DAY) 9.79 4.35 3.16 90 BARIUM, DIS- SOLVED (UG/L AS BA) 14 14 13 8 PH (STAND- ARD UNITS) 8.20 7.60 7.70 7.50 SODIUM, DIS- SOLVED (MG/L AS NA) 13 16 15 7.4 NITRO- GEN, N02+N03 DIS- SOLVED (MG/L AS N) <0.10 0.28 <0.10 0.40 BERYL- LIUM, DIS- SOLVED (UG/L AS BE) <0.5 <0.5 <0.5 <0.5 TEMPER- ATURE WATER (DBG C) 24.0 21.0 23.5 23.0 SODIUM AD- SORP- TION RATIO 0.8 0.9 0.9 0.7 NITRO- GEN, AMMONIA DIS- SOLVED (MG/L AS N) 0.03 0.04 0.03 0.17 CADMIUM DIS- SOLVED (UG/L AS CD) 1.0 <1.0 1.0 3.0 TUR- BID- ITY (NTU) 0.80 0.40 0.30 120 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 0.60 0.70 0.60 1.7 NITRO- GEN, AMMONIA DIS- SOLVED (MG/L AS NH4) 0.04 0.05 0.04 0.22 CHRO- MIUM, DIS- SOLVED (UG/L AS CR) <1 1 <5 3 OXYGEN, DIS- SOLVED (MG/L) 8.3 7.7 8.4 8.5 ALKA- LINITY WAT WH TOT FET FIELD MG/L AS CACO3 52 57 56 17 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.90 0.40 0.30 1.8 COBALT, DIS- SOLVED (UG/L AS CO) <3 <3 <3 <3 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 98 86 98 98 SULFATE DIS- SOLVED (MG/L AS SO4) 10 12 10 5.4 PHOS- PHORUS TOTAL (MG/L AS P) 0.03 0.05 0.02 0.07 COPPER, DIS- SOLVED (UG/L AS CU) <1 <10 <10 12 COLI- FORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) 290 K830 300 K14000 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 11 13 14 9.5 PHOS- PHORUS DIS- SOLVED (MG/L AS P) 0.02 0.04 0.02 0.05 IRON, DIS- SOLVED (UG/L AS FE) 54 23 14 280 STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) K110 430 550 39000 FLDO- RIDE, DIS- SOLVED (MG/L AS F) 0.10 0.10 0.30 <0.10 PHOS- PHORUS ORTHO, DIS- SOLVED (MG/L AS P) 0.02 0.03 0.01 0.01 LEAD, DIS- SOLVED (UG/L AS PB) <1 <10 <10 6 HARD- NESS TOTAL (MG/L AS CAC03) 49 57 53 21 SILICA, DIS- SOLVED (MG/L AS SI02) 26 25 24 11 PHOS- PHATE, ORTHO, DIS- SOLVED (MG/L AS P04) 0.06 0.09 0.03 0.03 LITHIUM DIS- SOLVED (UG/L AS LI) <4 <4 <4 <4 322 RIO GRANDE DE PATILLAS BASIN 50092000 RIO GRANDE DE PATILLAS NEAR PATILLAS, PR—Continued (National stream-quality accounting network station) WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MANGA- MOLYB- SELE- STRON- VANA- DATE OCT 1989 10. . . JAN 1990 05. .. APR 09. .. JUL 06. .. NESE, DIS- SOLVED (UG/L AS MN) 8 19 9 48 MERCURY DIS- SOLVED (UG/L AS HG) <0. 1 <0. 1 0.1 0.1 DENUM, NICKEL, DIS- DIS- SOLVED SOLVED (UG/L (UG/L AS MO) AS NI) <10 1 <10 <10 <10 <10 <10 2 NIUM, SILVER, DIS- DIS- SOLVED SOLVED (UG/L (UG/L AS SE) AS AG) <1 <1.0 <1 <1.0 <1 <1.0 <1 <1.0 TIUM, DIS- SOLVED (UG/L AS SR) 43 45 43 21 DIUM, DIS- SOLVED (UG/L AS V) <6 <6 <6 <6 ZINC, DIS- SOLVED (UG/L AS ZN) 6 9 16 18 PARTICLE-SIZE DISTRIBUTION OP SUSPENDED SEDIMENT DATE OCT 1989 10. . . JAN 1990 05. . . APR 09. . . JUL 06. .. TIME 1035 0850 0950 1045 STREAM- PLOW, INSTAN- TANEOUS (CFS) 40 13 10 594 SEDI- MENT, SUS- PENDED (MG/L) 44 36 10 3 SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) 4.8 1.3 0.27 4.8 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN . 062 MM 84 86 72 50 Island divide EXPLANATION SURFACE-WATER STATION AND NUMBER ^1065 QUALITY-OF-WATER STATION AND NUMBER WELL AND WELL NUMBER 1006 CREST-STAGE GAGE STATION MAR € A R I 8 E { .»8UAB!l.LA"'< w7ci'er ^_,.,_^.SAN^UA« * '""^""^ "'"*« !;«ARDO ;• CAauAs ,,ss f" J -Map area JjL 012345 6 KILOMETERS Figure 22.--South coast river basins the Rio Salinas to Rio Jacaguas basins. CO IV) CO 324 RIO SALINAS BASIN RIO LAPA NEAR RABO DEL BUEY, PR LOCATION.--Lat 18°03'36", long 66°14'28", Hydrologic Unit 21010004, on left bank, at bridge on Highway 1, Km 9.7, 1.5 mi (2.4 km) north of Rabo del Buey, and 4.4 mi (7.1 km) northeast of Salinas Plaza. DRAINAGE AREA.--9.92 mi' (25.69 kma ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.—1953-63 (annual low-flow measurements only), September 1988 to current year. GAGE.—Water-stage recorder and crest-stage gage. Elevation of gage is 394 ft (120 m), from topographic map. REMARKS.--Records fair. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 1,540 ftj/s (43.6 mj/s), Sept. 10, 1989, gage height, 9.94 ft (3.030 m) from rating curve extended above 100 ftj /s (2.832 mj/s) on basis of step-backwater analysis; minimum daily discharge, 0.02 ft'/s (0.0006 mj/s), Aug. 29, 1989. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 200 ft'/s (5.66 mj/s) and maximum (*) : Date Oct. 20 Oct. 21 Oct. 25 Aug. 22 Aug. 2 8 Time 1500 1400 1745 1630 1430 Discharge (ftVs) (m'/s) 368 459 342 202 562 10.4 13.0 9.68 5.72 15.9 Gage (ft) 7.68 7.94 7.60 7.08 8.20 height (m) 2.341 2.420 2.316 2.158 2.499 Discharge Date Aug. Sept. Sept. Sept. 29 14 25 30 Time 1630 1615 1645 1330 (ftj/s) 699 *755 209 309 (m'/s) 19.8 21.4 5.92 8.75 Gage height (ft) (m) 8.52 *8.64 7.11 7.49 2.597 2.633 2.167 2.283 Minimum daily discharge 0.06 ftj/s (0.002 m3 /s) , May 27. DISCHARGE, COBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES JAN MAR 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC- FT CFSM IN. CAL YR WTR YR 10 9.3 7.9 7.3 6.7 6.0 5.7 5.7 4.8 4.2 3.8 3.4 3.3 3.4 3.1 2.9 3.0 2.7 2.6 46 61 28 16 11 41 43 21 14 11 10 8.2 406.0 13.1 61 2.6 805 1.32 1.52 1989 1990 7.3 6.5 6.1 5.7 6.5 6.0 5.7 5.9 5.4 4.9 4.5 4.2 4.2 4.0 3.6 3.5 3.4 3.1 3.0 2.9 2.8 2.6 2.4 2.4 2.4 2.2 2.1 2.0 2.0 2.0 --- 119.3 3.98 7.3 2.0 237 .40 .45 TOTAL 1582, TOTAL 1141, 2.0 1.9 1.7 1.7 1.7 2.0 1.7 1.6 1.6 1.6 1.6 1.3 1.3 1.2 1.1 1.1 1.2 1.1 1.1 1.1 1.0 .91 .91 .91 .91 .91 .91 .89 .83 .78 .80 39.36 1.27 2.0 .78 78 .13 .15 .26 MEAN .69 MEAN .76 .80 .81 .78 .74 .72 .66 .74 .72 .68 .77 .71 .62 .58 .47 .44 .46 .39 .47 .48 .44 .43 .40 .44 .44 .44 .44 .45 .44 .42 .37 17.51 .56 .81 .37 35 .06 .07 4.33 MAX 3.13 MAX .34 .35 .32 .29 .30 .25 .27 .33 .36 .36 .30 .31 .38 .74 .69 .62 . 62 .60 .52 .48 .53 .60 .63 1.1 .87 .60 .54 .51 ___ ___ 13.81 .49 1.1 .25 27 .05 .05 210 MIN 81 MIN .89 .68 .53 .46 .39 .39 .37 .32 .40 .61 .47 .62 .89 1.1 .75 .59 .52 .41 .32 .29 .29 .29 .28 .24 .20 .19 .20 .21 .21 .21 .22 13.54 .44 1.1 .19 27 .04 .05 .02 AC-FT .06 AC-FT .24 .20 .18 .20 .19 .18 .18 .18 .17 .18 .20 .18 .55 .30 .25 .24 .25 .25 .30 .49 .47 .33 .31 .28 .28 .39 .46 .36 .30 .26 8.35 .28 .55 .17 17 .03 .03 3140 2260 .21 .22 .23 .21 .20 .18 .18 .22 .25 .47 .25 .20 .17 .20 .17 .14 .10 .15 .14 .13 .11 .12 .12 .15 .08 .11 .06 .13 .14 .18 .21 5.43 .18 .47 .06 11 .02 .02 CFSM .44 CFSM .32 .20 .16 .13 .13 .11 .13 .08 .08 .09 .11 .10 .15 .16 2.1 4.3 1.9 .80 .53 .48 .95 .67 .50 .55 .61 .59 .46 .42 .39 .38 .35 17.61 .59 4.3 .08 35 .06 .07 IN. 5.93 IN. 4.28 .34 .36 .31 .26 .28 .34 .31 .27 .26 .26 .21 .20 .20 .12 .29 .77 .99 1.5 .64 .49 .34 .24 .20 .53 5.2 2.3 1.6 .90 .57 .43 .36 21.07 .68 5.2 .12 42 .07 .08 .31 .31 .31 .33 .35 .32 .45 .42 .32 .98 .81 .47 .43 .42 .38 .30 .25 .20 .09 .12 .18 17 2.4 .89 .63 .56 .41 57 80 18 3.3 187.94 6.06 80 .09 373 .61 .70 1.9 1.9 .97 .68 .51 .52 .65 .65 .54 .55 .69 .73 .88 81 37 12 7.4 5.3 4.1 3.6 3.1 3.5 4.2 3.5 33 21 7.1 4.5 8.3 42 291.77 9.73 81 .51 579 .98 1.09 RIO SALINAS BASIN 50100450 RIO HAJADA AT LA PLENA, PR 325 LOCATION.--Lat 18°02'40", long 66°12'27", Hydrologic Unit 21010004, on right bank, upstream side of bridge on Hwy 712, about 0.3 mi (0.5 km) southwest of La Plena. DRAINAGE AREA.--16.7 mi 1 (43.3 km*). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--September 1988 to current year. GAGE.--Water-stage recorder. Elevation of gage is 410 ft (125 m), from topographic map. REMARKS.-Records fair except those for estimated daily discharges, which are poor. Some regulation at low flow upstream from station by local residents for agricultural purposes. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 886 ftVs (25.1 m'/s), Sept. 23, 1989, gage height, 6.68 ft (2.036 m) from rating curve extended above 8.7 ft'/s (0.246 m'/s) on basis of step-backwater analysis and logarithmic extension; minimum daily discharge, 0.05 ft'/s (0.001 mVs), June 4-10, 1990. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 50 ft'/s (1.42 m'/s) and maximum (*) : Date Aug. Aug. Sept. 28 29 14 Time 1945 1845 1615 Di scharge (ftVs) (m'/s) 51 162 367 1.44 4.59 10.4 Gage height (ft) (m) 4.07 4.97 5.83 1.240 1.515 1.777 Date Sept. Sept. Discharge Time (ft'/s) (m3/s) 24 30 1830 1300 *375 204 10.6 5.78 Gage (ft) *5.86 5.19 height (m) 1.786 1.582 Minimum daily discharge 0.05 ft'/s (0.001 m3/s), June 4-10. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES DAY NOV DEC FEB APR JUN AUG 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC -FT CFSM IN. CAL YR WTR YR 4.4 4.1 3.7 3.5 3.8 3.3 3.1 2.8 2.7 2.5 2.3 2.1 2.1 2.1 2.0 2.0 1.9 1.8 1.8 5.6 6.3 4.2 3.2 2.8 2.9 2.8 2.6 2.4 2.4 2.4 2.5 92.1 2.97 6.3 1.8 183 .18 .21 1989 1990 2.5 2.3 2.2 2.1 2.3 2.3 2.4 2.5 2.5 2.4 2.2 1.9 2.0 2.0 1.9 1.9 2.1 2.2 2.3 2.3 2.3 2.2 2.2 2.2 2.1 2.1 1.9 1.8 1.7 1.7 --- 64.5 2.15 2.5 1.7 128 .13 .14 TOTAL 1509, TOTAL 588, 1.7 1.7 1.6 1.6 1.6 1.5 1.8 1.5 1.4 1.4 1.4 1.3 1.3 1.2 1.2 1.1 1.1 1.0 1. 1 1.2 1. 1 1.0 .99 .95 1.0 .97 .88 .87 .88 .71 e.83 37.88 1.22 1.8 .71 75 .07 .08 ,97 MEAN .86 MEAN e.84 e.86 e.82 e.74 e.70 e.70 e.88 e.86 e.90 el.O e.94 e.80 e.72 e.70 e.66 e.68 e.60 e.90 el. 2 1.0 .84 .76 .63 .89 .92 2.0 2.1 2.3 1.5 1.2 .88 30.52 .98 2.3 .60 61 .06 .07 4.14 MAX 1.61 MAX .75 .68 .59 .63 .56 .49 .43 .49 .63 .75 .59 .47 .38 .47 .68 .49 .44 .53 .54 .48 .57 .92 .88 1.2 1.1 .71 .62 .52 ___ .__ --- 17.59 .63 1.2 .38 35 .04 .04 278 MIN 49 MIN .48 .56 .48 .44 .41 .34 .34 .33 .29 .45 .45 .56 .93 1.6 1 1.8 1.0 1.1 .89 .65 .57 1 .53 .53 .50 .48 .45 .40 .36 1 .40 .39 .28 .27 18.26 17 .59 1.8 .27 36 .04 .04 .21 AC-FT .05 AC-FT .24 .21 .22 .31 .45 .44 .34 .31 .31 .28 .26 .22 .55 . 1 .82 .61 .53 .49 .74 .5 .96 .72 .64 .59 .60 .97 .1 .82 .66 .53 --- .52 .58 1.5 .21 35 .03 .04 3000 1170 .44 .44 .40 .37 .33 .37 .37 .38 .45 .49 .45 .36 .28 .22 .18 .17 .17 .16 .18 .17 .34 .36 .13 .11 .07 .07 .06 .06 .06 .06 .08 7.78 .25 .49 .06 15 .02 .02 CFSM .25 CFSM .10 .08 .07 .06 .05 .05 .05 .05 .05 .05 .05 .06 .06 .06 .36 3.6 2.5 .94 .57 .47 2.9 .89 .51 .43 .33 .40 .35 .32 .24 .20 .16 --- 15.91 .53 3.6 .05 32 .03 .04 IN. 3, IN. 1. .13 .14 .16 .15 .12 .16 .49 .60 .32 .16 .12 .09 .07 .08 .08 1.7 .92 1.4 2.1 1.1 .62 .34 .20 1.2 5.7 3.8 2.9 1.4 .89 .66 .55 28.35 .91 5.7 .07 56 .05 .06 ,36 ,31 .47 .37 .41 .48 .94 1.1 .86 .67 .52 1.6 3.8 1.5 1.0 1.1 .74 .58 .47 .37 .24 .19 .14 1.3 .63 .28 .21 .16 .12 9.5 30 8.1 3.1 70.95 2.29 30 .12 141 .14 .16 1.7 1.1 .92 .74 .62 .56 .50 .51 .68 .86 .69 .65 .67 49 18 6.0 5.0 3.2 2.7 1.8 1.1 1.0 4.5 27 19 10 5.0 3.1 2.9 18 --- 187.50 6.25 49 .50 372 .37 .42 e Estimated 326 RIO COAMO BASIN 50106500 RIO COAMO NEAR COAMO, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°03'52", long 66°22'10", Hydrologic Unit 21010004, on Highway 153 bridge, 0.4 mi (0.6 km) above Rio de la Mina, and 1.8 mi (2.9 km) south of Coamo plaza. DRAINAGE AREA.--46.0 mi» (119.1 km 1 ). PERIOD OF RECORD.--Water years 1978 to current year. WATER-QUALITY RECORDS, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 23. .. DEC 08. . . FEB 1990 09. . . APR 10. . . JUN 22. . . AUG 03. . . DIS- CHARGE, SPE- INST. CIFIC CUBIC CON- PH TEMPER- TUR- FEET DUCT- (STAND- ATURE BID- TIME PER ANCE ARD WATER ITY SECOND (US/CM) UNITS) (DEG C) (NTU) 1140 73 466 8.00 26.5 4.0 1105 13 686 7.80 26.5 2.4 1120 8.1 600 7.80 25.0 2.1 1145 5.4 668 7.80 30.5 15 1040 622 703 7.40 30.5 3.7 1040 2.8 736 7.60 29.0 2.5 HARD- OXYGEN, OXYGEN COLI- STREP- DIS- DEMAND, FORM, TOCOCCI SOLVED CHEM- FECAL, FECAL, OXYGEN, (PER- ICAL 0.7 KF AGAR DIS- CENT (HIGH UM-MF (COLS. SOLVED SATUR- LEVEL) (COLS./ PER (MG/L) ATION) (MG/L) 100 ML) 100 ML) 7.1 88 11 K730 550 5.3 66 17 4500 4600 7.8 94 18 470 290 5.0 66 23 K630 280 3.7 49 25 K86000 22000 3.1 40 16 3900 3000 ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SIUM, SODIUM, AD- TOTAL WH WAT DIS- DIS- DIS- SORP- SIUM, WAT WH SULFATE RIDE, DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE OCT 1989 23. . . DEC 08. . . FEB 1990 09. .. APR 10. . . JUN 22. . . AUG 03. .. AS MG/L AS (MG/L (MG/L (MG/L RATIO CAC03) CAC03 AS CA) AS MG) AS NA) 170 0 46 14 25 0. __ -- 260 0 68 21 42 1 -_ 270 0 73 22 45 1 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL RIDE, DIS- CONSTI- DIS- AT 105 (MG/L MG/L AS (MG/L (MG/L (MG/L AS K) CAC03 AS S) AS SO4 ) AS CL) 8 2.7 160 <0.5 26 25 240 250 3.8 250 <0.5 34 50 260 3.8 270 -- 33 59 NITRO- NITRO- NITRO- NITRO- NITRO- GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEC. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC OCT 23 DEC 08 FEB 09 APR 10 JUN 22 AUG 03 SOLVED (MG/L DIS- (TONS SUS- DATE (MG/L AS SOLVED PER PENDED AS F) SI02) (MG/L) DAY) (MG/L) 1989 0.20 29 264 52.0 11 ... 1990 11 0.20 33 397 5.79 <1 23 0.80 35 433 3.29 2 TOTAL TOTAL TOTAL TOTAL TOTAL (MG/L (MG/L (MG/L (MG/L (MG/L AS N) AS N) AS N) AS N) AS N) 1.65 0.05 1.7 0.35 0.25 1.60 0.30 1.9 0.64 1.9 1.31 0.39 1.7 1.0 0.60 0.79 0.31 1.1 1.2 0.40 0.58 0.22 0.80 2.5 1.6 1.23 0.37 1.6 0.50 0.60 K = non-ideal count RIO COAMO BASIN 50106500 RIO COAMO NEAR COAMO, PR—Continued WATER-QUALITY RECORDS, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 327 DATE OCT 1989 23. . . DEC 08.. . FEB 1990 09.. . APR 10.. . JUN 22.. . AUG 03... DATE OCT 1989 23. . . DEC 08. .. FEB 1990 09. .. APR 10.. . JUN 22.. . AUG 03.. . NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.60 2.5 1.6 1.6 4.1 1.1 IRON, TOTAL RECOV- ERABLE (UG/L AS FE) 670 -- -- 1800 -- -- NITRO- GEN, TOTAL (MG/L AS N) 2.3 4.4 3.3 2.7 4.9 2.7 LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) 1 -- -- 7 -- -- NITRO- GEN, TOTAL (MG/L AS NO3) 10 19 15 12 22 12 MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) 40 -- -- 210 -- -- PHOS- PHORUS TOTAL (MG/L AS P) 0.28 1.1 0.85 0.90 1.0 0.97 MERCURY TOTAL RECOV- ERABLE (UG/L AS HG) <0.10 -- -- <0.10 -- -- BARIUM, TOTAL ARSENIC RECOV- TOTAL ERABLE (UG/L (UG/L AS AS) AS BA) <1 <100 __ __ 1 <100 .. - - - - SILVER, SELE- TOTAL NIUM, RECOV- TOTAL ERABLE (UG/L (UG/L AS SE) AS AG) <1 <1 __ __ <1 <1 __ ._ BORON, TOTAL RECOV- ERABLE (UG/L AS B) 20 -- -- 190 -- " ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) <10 -- -- 10 -- -- CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- 2 -- - - CYANIDE TOTAL (MG/L AS CN) <0.010 -- -- <0.010 -- -- CHRO- MIUM, COPPER, TOTAL TOTAL RECOV- RECOV- ERABLE ERABLE (UG/L (UG/L AS CR) AS CU) <1 <10 __ __ 3 20 __ — - - — METHY- LENE BLUE ACTIVE PHENOLS SUB- TOTAL STANCE (UG/L) (MG/L) 8 0.05 __ __ 1 0.06 __ -- 328 RIO DESCALABRADO BASIN 50108000 RIO DESCALABRADO NEAR LOS LLANOS, PR LOCATION.--Lat 18°03'08", long 66°25'34", Hydrologic Unit 21010004, at bridge on Highway 14, 1.5 mi (2.4 km) west of Los Llanos, and 5.3 mi (8.5 km) east of Juana Diaz. DRAINAGE AREA.--12.9 mi» (33.4 km a ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--1959-65 (annual low-flow measurements only), 1965 (annual maximum discharge), January 1966 to June 1969, July to December 1969 (maximum discharge only), February 1984 to current year. GAGE.--Water-stage recorder. Elevation of gage is 220 ft (67 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. Some regulation at low flow by local resident upstream from station. AVERAGE DISCHARGE.--6 years (1985-1990), 9.045 ftVs (0.256 mVs), 9.522 in/yr (242 mm/yr), 6,550 acre-ft/yr (8.08 hm3 /yr) . EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 30,000 ftVs (850 m'/s), Oct. 7, 1985, gage height, 24.37 ft (7.43 m), from rating curve extended above 10,000 ftVs (283 m3 /s) on basis of step-backwater analysis; no flow many days. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,500 ft3 /s (42.5 m3/s) and maximum (*): Oct. 8 Oct. 20 Time 1745 1615 Discharge (ft'/s) (m3 /s) 2,210 1,690 62.6 47.9 Gage height (ft) (m) 8.77 2.673 7.98 2.432 Sept. 14 Sept. 28 Time 1715 1645 Discharge (ft3 /s) (mVs) *3,200 1,920 90.6 54.4 Minimum daily discharge, 0.05 ftVs (0.001 m3 /s), Aug. 26,30, Sept. 1,2. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES MAY JUN JUL Gage height (ft) (m) *10.13 3.088 8.34 2.542 SEP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC -FT CFSM IN. CAL YR WTR YR 2.0 1.8 4.6 2.9 2.8 24 9.5 173 35 12 9.5 4.8 1.7 1.3 5.2 6.1 3.8 2.3 1.9 122 19 17 8.5 6.6 5.7 5.7 5.7 5.1 8.7 7.1 7.8 523.1 16.9 173 1.3 1040 1.31 1.51 1989 1990 5.9 4.0 2.9 2.7 2.3 2.4 2.1 9.4 15 64 12 6.7 4.2 3.2 2.6 2.4 12 5.2 2.6 2.1 1.5 1.4 1.4 1.9 2.3 2.4 2.0 1.7 1.8 1.8 --- 181.9 6.06 64 1.4 361 .47 .52 TOTAL 1638, TOTAL 1835. 2.1 2.0 1.4 1.4 1.1 1.2 1.1 .93 .89 .82 .81 .97 .97 1.5 2.6 3.0 3.0 2.9 3.5 2.7 2.5 2.4 1.9 2.2 3.1 2.8 3.1 3.2 3.7 4.7 4.4 68.89 2.22 4.7 .81 137 .17 .20 .72 MEAN .85 MEAN 6.0 10 6.1 2.2 .72 .90 .89 .88 .81 .89 1.2 1.2 1.1 .93 .84 .84 .73 .75 .84 1.4 .79 .67 .61 .62 .74 .90 1.1 1.4 1.1 .93 .83 48.91 1.58 10 .61 97 .12 .14 4.49 MAX 5.03 MAX .83 .69 .61 .61 .51 .44 .53 .57 .52 .55 .41 .50 .54 .31 .35 .32 .34 .31 .30 .45 .47 1.3 .24 .37 .29 .34 .37 .38 ___ ___ --- 13.45 .48 1.3 .24 27 .04 .04 173 MIN 194 MIN .35 .35 .33 .32 .33 .29 .30 .29 .29 .28 .24 .21 .26 .31 .24 .24 .34 .20 .20 12 .14 2 .13 .14 .13 .12 .11 .09 .09 .10 .11 .14 .15 6.82 23 .22 .35 .09 14 .02 .02 .27 AC- FT .05 AC- FT .16 .18 .24 .53 .34 .32 .35 .52 .47 .40 .33 .26 .53 .55 .48 .41 .34 .34 .4 .35 .25 .24 .22 .21 .27 .20 .16 .15 .15 --- .35 .78 12 .15 46 .06 .07 3250 3640 .18 .18 .17 .12 .12 .11 .12 .29 .22 .17 7.2 1.9 .10 .09 .09 .09 .08 .08 .09 .10 .09 .10 .11 .12 .14 .15 .15 .14 .12 .12 .12 12.86 .41 7.2 .08 26 .03 .04 CFSM .35 CFSM .39 .11 .13 .16 .16 .23 .21 .27 .21 .18 .14 .14 . 12 .14 1.0 8.1 .29 .11 .09 1.7 .15 . 09 .09 .35 .21 .16 .13 .12 .10 .10 .12 --- 15.11 .50 8.1 .09 30 .04 .04 IN. 4.73 IN. 5.29 .11 .12 .13 .12 .15 .28 .15 .10 .10 .08 .08 .08 .08 .10 3.6 .16 .20 .09 .10 .10 .09 .10 .21 .11 .10 .16 .11 .12 .12 .12 .11 7.28 .23 3.6 .08 14 .02 .02 .07 .08 . 07 3.4 .06 .05 .06 .05 .07 .10 .07 .14 .12 .12 .11 .10 .09 .09 .08 .18 . 11 .08 .11 .06 .06 .05 .06 .06 .06 .05 .06 5.87 .19 3.4 .05 12 .01 .02 .05 .05 29 5.6 .98 9.2 .33 1.1 52 14 1.6 .83 .21 194 46 e4.3 el. 8 e.66 e2.9 e3.7 el.l e2.9 e21 elOO e25 e60 e65 e!45 elOS e35 928.31 30.9 194 .05 1840 2.40 2.68 Estimated RIO DESCALABRADO BASIN 50108000 RIO DESCALABRADO NEAR LOS LLANOS, PR--Continued WATER QDALITY RECORDS PERIOD OP RECORD.--WATER YEARS APRIL 1984 TO SEPTEMBER 1985, OCTOBER 1987 TO CURRENT YEAR 329 STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DDCTANCE TORE (CFS) (DMHOS) (DEC C) DATE TIME STREAMFLOW, INSTANTANEOUS (CFS) SPECIFIC CON- TEMPERA- DDCTANCE TORE (DMHOS) (DEC C) NOV. DEC. JAN. FEB. MAR. APR. 02 1204 01 1217 19 1002 05 1205 05 1305 03 1325 4.97 2.57 .80 .28 .22 485 500 608 580 687 721 27.5 26.0 24.0 27.0 30.0 30.5 330 RIO JACAGUAS BASIN 50110900 RIO TOA VACA ABOVE LAGO TOA VACA, PR LOCATION.--Lat 18°07'37", long 66°27'24", Hydrologic Unit 21010004, on right bank, off a dirt road about 0.3 mi (0.5 km) from road 553, 2.4 mi (3.9 km) southeast from Villalba plaza, and 0.2 mi (0.3 km) downstream from confluence with Quebrada Limon. DRAINAGE AREA.--7.64 mi a (19.79 kma ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--April 1989 to current year. GAGE.--Water stage recorder. Elevation of gage is 525 ft (160 m ), from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. Gage-height and precipitation satellite telemetry at station. EXTREMES FOR PERIOD OP RECORD.--Maximum discharge 3,740 ftVs (106 m3 /s). Aug. 24, 1989, gage-height, 9.62 ft (2.93 m), from rating curve extended above 100 ft3 /s (2.83 m'/s) on basis of step-backwater analyisis, minimum discharge, 0.44 ftVs (0.012 mVs), Aug. 7,8, 1990. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,000 ft3 /s ( 28.3 m'/s) and maximum (*): Date Oct. Sept. Sept. 8 9 14 Time 1630 1745 1730 Discharge (ftVs) (mVs) l', 1, 750 280 290 49 36 36 .6 .2 .5 Gage height (ft) (m) *7 6 6 .61 .95 .96 2 2 2 .320 .118 .121 Discharge Date Sept. Sept. Sept. 23 24 30 Time 1500 1615 1445 (ftVs) (m3/s) 1 1 1 ,350 ,430 ,310 38, 40, 37, .2 .5 .1 Gage (ft) 7 7 7 .06 .18 .00 height (m) 2. 2. 2. 152 188 134 Minimum discharge, 0.44 ftVs (0.012 m3 /s) , Aug. 7,8. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES NOV JAN MAR 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC- FT CFSM IN. 55 110 92 65 53 55 37 100 54 35 27 23 21 19 24 26 26 28 24 96 71 51 42 39 41 50 52 50 63 48 35 1512 48.8 110 19 3000 6.38 7.36 29 25 21 18 17 16 15 23 16 e!4 e!2 ell elO e9.4 e9.2 e9.0 ell e9.6 e8.8 e8.6 e8.4 e8.4 e8.0 e7.6 e7.4 e7.4 e7.0 e6.6 e6.6 e6.6 --- 366.6 12.2 29 6.6 727 1.60 1.79 e6.6 e6.0 e6.6 e7.8 e6.0 6.4 7.1 6.5 6.3 5.8 5.7 5.3 5.5 5.6 5.2 4.9 4.7 4.4 4.3 4.1 4.0 4.1 4.0 4.0 4.0 3.9 3.8 4.0 3.9 3.1 5.9 159.5 5. 15 7.8 3.1 316 .67 .78 11 9.1 4.3 3.7 3.6 3.3 3.3 3.2 e5.4 e3.9 e4.1 3.7 3.5 3.5 3.4 3.1 3.2 3.0 3.0 3.0 3.0 2.8 2.9 3.6 3.0 2.9 3.0 3.0 2.8 2.7 2.3 116.3 3.75 11 2.3 231 .49 .57 2.3 2.4 2.4 2.3 2 .3 2 .2 2.3 2.8 2.7 2.6 2.9 4.0 3.0 3.1 2.9 2.3 2.2 2 . 2 2.2 2.0 1.9 1.9 2.0 2.1 1.9 1.9 1.9 1.8 ___ ___ --- 66.5 2.37 4.0 1.8 132 .31 .32 1.8 1.8 1.8 1.8 1.8 1.8 1.8 1.8 1.6 1.7 1.7 1.6 1.7 2.2 2.2 1.8 1.8 1.7 1.6 1.6 1.5 1.5 1.6 1.5 1.4 1.5 1.5 1.5 1.5 1.4 1.4 51.9 1.67 2.2 1.4 103 .22 .25 1.3 1.4 1.4 1.3 1.3 1.3 1.3 1.2 1.2 1.2 1.2 1.2 1.2 1.4 1.6 1.4 1.3 2.6 5.6 1.9 1.4 1.2 1.1 1.1 1.0 1.1 1.1 1.1 1.1 1.2 --- 43.7 1.46 5.6 1.0 87 .19 .21 1.2 1.2 1.3 1.3 1.2 1.2 1.2 2.6 2.0 1.5 5.6 3.0 1.3 1.1 1.0 .95 .95 1.0 1.1 1.1 1.2 1.1 1.2 1.0 1.0 1.1 1.1 1.1 1.3 1.1 1. 1 44 .10 1.42 5.6 .95 87 .19 .21 1.2 1.0 .92 .91 .91 1.0 1. 0 .92 .87 .86 .84 .84 .92 1.1 9.2 2.7 1.2 .91 1.1 1.1 .88 .73 .71 .75 .83 .79 .70 .67 .66 .64 --- 36. 86 1.23 9.2 .64 73 .16 .18 .70 .73 .66 .74 .73 .71 .74 .73 .65 .64 .58 .56 .51 .60 .70 .83 .63 .72 1.1 .79 .60 .54 .51 .63 1.1 .86 .91 .86 .73 .70 .65 22.14 .71 1. 1 .51 44 .09 .11 .67 .89 .85 1.5 .92 .59 .45 .46 .48 .62 .95 .71 .74 1.6 1.1 .86 .71 .76 .73 .71 .70 1.7 1.8 1.3 .92 .76 .73 12 32 14 2.7 84.91 2.74 32 .45 168 .36 .41 1.5 1.2 35 5.8 43 21 4.3 2.8 99 45 13 7.0 34 129 86 49 25 16 11 8.0 6.3 4.7 114 134 94 57 34 18 27 151 --- 1276.6 42.6 151 1.2 2530 5.57 6.22 WTR YR 1990 TOTAL 3781.11 MEAN 10.4 MAX 151 MIN e Estimated .45 AC-PT 7500 CPSM 1.36 IN. 18.41 331 RIO JACAGUAS BASIN 50110900 RIO TOA VACA ABOVE LAGO TOA VACA, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORDS.-- Water years 1988 to 1990. PERIOD OF DAILY RECORD.-- SUSPENDED-SEDIMENT DISCHARGE: April 1988 to September 1990. EXTREMES FOR PERIOD OF DAILY RECORD.-- SEDIMENT CONCENTRATION: Maximum daily mean, 1,080 mg/L Sep. 31, 1989; Minimum daily mean, 1 mg/L several days. SEDIMENT LOADS: Maximum daily mean, 1,960 tons (1,780 tonnes) Sep. 31, 1990; Minimum daily mean, 0.0 ton (0.0 tonne) several days. EXTREMES FOR WATER YEARS 1989-90.-- Water Suspended-sediment concentration (mg/L) Suspended- sediment discharge (tons per day) Year maximum minimum maximum minimum 1989 978 (Sep. 18) 1 (several days) 3,400 (Aug. 24) 0.0 (several days) 1990 1,080 (Sep. 31) 1 (several days) 1,960 (Sep. 31) 0.0 (several days) SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) APRIL MAY JUNE 1 --- --- --- 1.3 2 .00 5.1 5 .07 2 --- --- --- 1.0 2 .00 8.2 10 .39 3 --- --- --- .96 2 .00 12 12 .82 4 --- --- --- .96 2 .00 30 31 4.8 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 1.2 1.2 1.1 1.1 1.1 1.1 1.1 1.1 1.3 1.3 1.3 1.3 1.3 1.4 1.4 1.7 1.7 1.8 1.2 1.2 1.2 1.1 1.3 1.1 1.1 1.4 --- 2 2 2 2 2 2 2 2 2 2 2 2 2 2 3 .-, 2 2 2 2 2 2 1 2 2 --- .00 .00 .00 .00 .00 . 00 .00 .00 .00 .00 .00 .00 .00 .01 .02 .01 .00 .00 . 00 .00 .00 .00 . 00 .00 . 00 ___ 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 3 3 3 2 21 6 3 .96 .96 .2 .3 .5 .8 . 1 .1 .1 .2 .4 .4 .3 .4 .4 .5 .5 .6 .7 .7 .3 .3 .6 .7 .5 .8 2 2 2 2 2 3 2 2 2 2 2 2 2 2 2 2 3 2 2 2 4 4 4 3 28 7 5 .00 .00 .00 .00 .00 .01 .00 .00 .00 .00 .00 .00 .00 .00 .00 .01 .01 .00 .00 .01 .03 .04 .03 .02 10 .13 .06 13 4. 3. 2. 2. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 2. 1. 1. 1. 1. 1. 1. 1. 1. -- 8 4 4 0 8 6 7 7 6 5 4 4 3 5 3 2 9 7 4 3 2 2 2 1 1 - 14 6 6 6 5 5 5 5 3 3 2 3 5 5 8 10 10 10 10 10 7 5 4 4 5 5 ___ .61 .09 .05 .04 .03 .02 .02 .02 .02 .02 .01 .01 .02 .02 .03 .04 .04 .08 .05 .04 .03 .02 .02 .02 .02 .02 TOTAL 75.54 10.35 112.0 7.47 332 RIO JACAGDAS BASIN 50110900 RIO TOA VACA ABOVE LAGO TOA VACA, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) 1 1 1 1 1 2 5 4 2 2 16 8 34 17 5 3 2 1 1 1 1 1 1 1 1 1 1 1 1 128 .2 .6 .6 .4 .4 .6 .7 .1 .5 .1 .1 .4 .1 .0 .7 .6 .6 .6 .5 .4 .1 .2 .3 .99 .1 .1 .1 .95 .04 JULY 5 5 8 9 8 6 17 24 18 11 20 9 140 43 39 35 30 21 11 4 2 2 2 1 1 1 3 5 5 5 4 ___ .02 .02 .03 .03 .02 .05 .57 .30 .12 .07 3.1 .25 91 2.0 .59 .29 .16 .09 .04 .01 .00 .00 .00 .00 .00 .00 .01 .02 .02 .02 .01 98.84 MEAN DISCHARGE (CFS) 5. 6, 2, 2 2, 1. 1, 4. 2, 2, 1, 1. 1. 1. 1, 3, 2, 25 3, 1, 219 39 8. 5. 4. 6, 7. 4. 369. .93 .87 .96 .9 . 6 , 6 .7 .5 .5 ,7 .2 .2 , 1 .3 . 1 .2 . 1 .1 .5 .2 .0 . 6 .6 ,3 , 1 , 0 . 6 . 1 .56 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) AUGUST MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) SEPTEMBER 4 3 3 6 7 4 4 4 2 2 4 4 4 5 5 5 5 5 5 5 130 4 2 680 39 16 17 17 12 10 10 .00 .00 .00 .21 .18 .03 .04 .02 .01 .00 .04 .03 .02 .02 .02 .02 .02 .02 .04 .03 106 .04 .00 3400 6.1 .36 .22 .19 .20 .21 . 12 3514.19 3. 2. 2. 1. 1. 2. 1. 20 30 30 42 14 8. 5. 4. 3. 3. 356 180 79 65 28 68 123 58 27 16 53 83 72 5 7 3 9 9 1 9 5 4 1 2 1 10 10 10 10 10 10 10 33 30 35 40 14 9 6 5 4 4 978 491 90 102 24 83 75 21 8 4 581 96 92 .10 .08 .07 .05 .05 .05 .05 10 3.8 7.8 5.7 .56 .22 .09 .06 .04 .03 3090 769 22 60 2.0 25 25 3.7 .64 .19 438 25 29 1384.6 4518.28 RIO JACAGDAS BASIN 50110900 RIO TOA VACA ABOVE LAGO TOA VACA, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 333 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) OCTOBER 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 55 110 92 65 53 55 37 100 54 35 27 23 21 19 24 26 26 28 24 96 71 51 42 39 41 50 52 50 63 48 35 56 270 116 49 35 48 32 243 28 14 11 11 10 9 22 18 25 25 18 614 59 16 22 36 40 52 52 50 68 35 18 9. 337 31 9. 5. 14 3. 443 4. 1. 1. 1. 2. 2. 1. 867 12 2. 3. 4. 5. 8. 8. 9. 14 4. 1. 8 0 8 4 4 4 81 67 55 49 6 6 1 1 3 2 5 1 9 3 0 7 9 8 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) NOVEMBER MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) DECEMBER 29 25 21 18 17 16 15 23 16 e!4 el2 ell elO e9 e9 e9 ell e9 e8 e8 e8 e8 e8 e7 e7 e7 e7 e6 e6 e6 .4 .2 .0 .6 .8 .6 .4 .4 .0 .6 .4 .4 .0 .6 .6 .6 11 10 7 5 4 4 4 16 11 3 e3 e2 e2 e2 el el e3 e4 eS e7 e8 e5 e4 e4 e4 e5 e6 e6 eS eS 2 e e e e e e e e e e e e e e e e e e e e .90 .63 .41 .24 .20 .17 .16 .1 .53 .14 .10 .07 .06 .06 .03 .03 .09 .11 .12 .18 .18 .12 .08 .08 .09 .11 .12 .10 .09 .08 e6. e6. e6. e7. e6. 6. 7. 6. 6. 5. 5. 5. 5. 5. 5. 4. 4. 4. 4. 4. 4. 4. 4. 4. 4. 3. 3. 4. 3. 3. 5. 6 0 6 8 0 4 1 5 3 8 7 3 5 6 2 9 7 4 3 1 0 1 0 0 0 9 8 0 9 1 9 e4 e4 e4 e3 e4 6 8 10 11 11 12 13 14 14 13 9 7 6 6 5 5 5 5 5 5 5 5 5 5 5 16 e.08 e.06 e.08 e.07 e.06 .11 .16 .17 .16 .16 .17 .18 .20 .21 .17 .11 .08 .07 .06 .06 .06 .06 .06 .06 .06 .05 .05 .06 .05 .04 .45 TOTAL 1512 1811.42 366.6 7.38 159.5 3.42 e Estimated 334 RIO JACAGUAS BASIN 50110900 RIO TOA VACA ABOVE LAGO TOA VACA, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 IAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN DISCHARGE (CFS) 11 9.1 4.3 3.7 3.6 3.3 3.3 3.2 e5.4 e3.9 e4.1 3.7 3.5 3.5 3.4 3.1 3.2 3.0 3.0 3.0 3.0 2.8 2.9 3.6 3.0 2.9 3.0 3.0 2.8 2.7 2.3 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) JANUARY 31 22 12 10 10 10 10 10 elO e7 e5 5 5 5 5 5 5 5 5 6 7 8 7 6 5 5 5 5 5 4 4 116.3 1.5 .77 .13 .10 .10 .09 .08 .08 e.14 e.08 e.05 .04 .04 .04 .04 .04 .04 .04 .04 .05 .06 .06 .05 .05 .04 .04 .04 .04 .04 .02 .02 3.95 MEAN MEAN CONCEN- SEDIMENT MEAN DISCHARGE TRATION DISCHARGE DISCHARGE (CPS) (MG/L) (TONS/DAY) (CFS) FEBRUARY 2 2 2 2 2 2 2 2 2 2 2 4 3 3 2 2 2 2 2 2 1 1 2 2 1 1 1 1 - - - .3 .4 .4 .3 .3 .2 .3 .8 .7 .6 .9 .0 .0 .1 .9 .3 .2 .2 .2 .0 .9 .9 .0 .1 .9 .9 .9 .8 -- -- -- 4 4 5 5 5 5 5 5 5 5 5 3 3 5 8 10 9 7 5 3 2 3 4 5 6 8 7 5 ___ .-_ _._ .02 .03 .04 .03 .03 .03 .03 .03 .04 .04 .04 .03 .02 .04 .06 .06 .05 .04 .03 .02 .02 .02 .02 .02 .03 .04 .04 .03 ___ ___ -__ 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 2. 2. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 8 8 8 8 8 8 8 8 6 7 7 6 7 2 2 8 8 7 6 6 5 5 6 5 4 5 5 5 5 4 4 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) MARCH 4 4 4 5 5 5 5 3 5 5 4 3 2 2 3 3 3 3 3 3 2 2 2 2 2 4 6 8 10 7 6 66.5 0.93 51.9 .02 .02 .02 .02 .02 .02 .02 .01 .02 .02 .02 .01 .01 .02 .02 .02 .02 .02 .02 .01 .00 .00 .00 .00 .00 .01 .02 .03 .04 .02 .02 0.50 e Estimated RIO JACAGUAS BASIN 50110900 RIO TOA VACA ABOVE LAGO TOA VACA, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 335 DAY 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) 1.3 1.4 1.4 1.3 1.3 1.3 1.3 1.2 1.2 1.2 1.2 1.2 1.2 1.4 1.6 1.4 1.3 2.6 5.6 1.9 1.4 1.2 1.1 1.1 1.0 1.1 1. 1 1.1 1.1 1.2 APRIL 3 3 2 2 1 1 1 1 1 2 2 2 2 2 2 2 2 2 21 6 5 4 3 1 1 1 2 2 2 6 .00 . 02 .01 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .01 .74 .04 .02 .02 .01 .00 .00 .00 .00 .00 .00 .02 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) MEAN DISCHARGE (CFS) MAY MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) JUNE 1.2 1.2 1.3 1.3 1.2 1.2 1.2 2.6 2.0 1.5 5.6 3.0 1.3 1. 1 1.0 .95 .95 1.0 1. 1 1.1 1.2 1.1 1.2 1.0 1.0 1.1 1.1 1. 1 1.3 1.1 1.1 7 5 4 3 3 3 3 7 4 3 14 8 3 .03 .01 .02 .01 .00 .00 .00 .07 .02 .02 .48 .10 .01 .00 .01 .01 .00 .00 .00 .00 .01 .02 .01 .02 .02 .02 .02 .01 .02 .02 .02 1 1 1 1 1 9 2 1 1 1 .2 .0 .92 .91 .91 .0 .0 .92 .87 .86 .84 .84 .92 .1 .2 .7 .2 .91 .1 .1 .88 .73 .71 .75 .83 .79 .70 .67 .66 .64 4 2 2 2 2 2 2 2 2 3 2 3 3 3 21 7 4 5 5 5 5 3 3 3 3 3 3 3 3 3 .02 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .55 .07 .02 .02 .01 .01 .02 .00 .00 .00 .00 . 00 .00 .00 .00 .00 43.7 44. 10 0.98 36.86 0.72 336 RIO JACAGUAS BASIN 50110900 RIO TOA VACA ABOVE LAGO TOA VACA, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) JULY 1 .70 3 .00 2 .73 5 .01 3 .66 4 .00 4 .74 4 .01 5 .73 5 .01 6 .71 5 .00 7 .74 5 .01 8 .73 5 .02 9 .65 4 .00 10 .64 26 .04 11 .58 9 .01 12 .56 55 .09 13 .51 63 .09 14 .60 59 .10 15 .70 54 .10 16 .83 51 .10 17 .63 50 .08 18 .72 48 .10 19 1.1 47 .14 20 .79 44 .10 21 .60 40 .07 22 .54 36 .05 23 .51 32 .04 24 .63 28 .06 25 1.1 24 .06 26 .86 22 .06 27 .91 19 .05 28 .86 16 .04 29 .73 15 .03 30 .70 14 .02 31 .65 14 .02 TOTAL 22.14 --- 1.51 84.91 --- 65.27 1276.6 --- 7978.14 YEAR 3781.11 9875.11 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) AUGUST 1. 1. 1. 1. 1. 1. • 12 32 14 2. 67 89 85 5 92 59 45 46 48 62 95 71 74 6 1 86 71 76 73 71 70 7 8 3 92 76 73 7 14 11 6 5 7 8 5 8 11 10 10 10 9 9 11 14 15 16 16 15 13 12 11 10 9 9 8 48 159 44 13 .02 .02 .01 .02 .02 .02 .00 .01 .02 .02 .03 .02 .02 .04 .03 .03 .02 .03 .04 .03 .02 .07 .05 .03 .02 .02 .02 6.5 55 3.0 .09 MEAN DISCHARGE (CFS) MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) SEPTEMBER 1.5 1.2 35 5.8 43 21 4.3 2.8 99 45 13 7.0 34 129 86 49 25 16 11 8.0 6.3 4.7 114 134 94 57 34 18 27 151 --- 14 12 205 35 421 71 12 7 647 174 34 12 165 773 420 185 77 43 26 17 15 13 988 771 460 143 93 55 99 1080 --- .05 .04 124 .71 409 7.1 .17 .06 1150 28 1.3 .24 66 1180 116 27 5.3 1.8 .79 .36 .24 .18 1590 1100 145 27 14 2.8 21 1960 --- 337 RIO JACAGOAS BASIN 50110900 RIO TOA VACA ABOVE LAGO TOA VACA, PR--Continued PARTICLE-SIZE DISTRIBUTION OP SUSPENDED SEDIMENT DATE SEP 1990 14. .. 23. .. 30. . . DATE SEP 1990 14.. . 23.. . 30. . . TIME 1633 1457 1437 SED. SUSP. PALL DIAM. PERCENT PINER THAN .016 MM 52 31 23 DIS- CHARGE, INST. CUBIC PEET PER SECOND 701 1160 1160 SED. SUSP. PALL DIAM. PERCENT PINER THAN .031 MM 66 50 35 SEDI- MENT, SUS- PENDED (MG/L) 3960 9430 13000 SED. SUSP. SIEVE DIAM. PERCENT PINER THAN .062 MM 88 72 56 SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) 7500 29500 41600 SED. SUSP. SIEVE DIAM. PERCENT PINER THAN .125 MM 95 85 70 SED. SUSP. PALL DIAM. PERCENT PINER THAN .002 MM 11 9 6 SED. SUSP. SIEVE DIAM. PERCENT PINER THAN .250 MM 99 92 85 SED. SUSP. PALL DIAM. PERCENT FINER THAN .004 MM 22 13 12 SED. SUSP. SIEVE DIAM. PERCENT PINER THAN .500 MM 100 97 95 SED. SUSP. PALL DIAM. PERCENT FINER THAN .008 MM 26 19 15 SED. SUSP. SIEVE DIAM. PERCENT PINER THAN 1.00 MM 100 98 99 338 RIO JACAGUAS BASIN 50111500 RIO JACAGUAS AT JUANA DIAZ, PR LOCATION.--Lat 18°03'16", long 66°30'40", Hydrologic Unit 21010004, on Highway 14 bridge, 0.4 mi (0.6 km) west of Juana Diaz plaza, and 4.0 mi (6.4 km) downstream from Lago Guayabal. DRAINAGE AREA.--49.8 mi a (129.0 km1 ). WATER-DISCHARGE RECORDS PERIOD OP RECORD.--Harch 1984 to current year. GAGE.--Water-stage recorder. Elevation of gage is 131 ft (40 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. Plow regulation from Lago Guayabal. Gage-height and precipitation satellite telemetry at station. AVERAGE DISCHARGE.--6 years (1985-90), 48.2 ftVs (1.365 mVs) , 13.14 in/yr (334 mm/yr), 34,920 acre-ft/yr (43.0 hmVyr) EXTREMES POR PERIOD OP RECORD.--Maximum discharge, 40,000 ft3/s (1,130 m3/s), Oct. 7, 1985, gage height, 29.42 ft (8.967 m) from rating curve extended above 500 ftVs (14.2 mVs) on basis of step-backwater analysis and logarithmic extension; minimum daily discharge, 0.68 ft3 /s (0.012 mVs), Sept. 1, 1990. EXTREMES POR CURRENT YEAR.--Maximum discharge, 3,810 ftVs (108 m3 /s), Oct. 8, gage height, 12.6 ft (3.840 m) from rating curve extended above 500 ftVs (14.2 mVs) on basis of step-backwater analysis and logarithmic extension; minimum daily discharge 0.68 ftVs (0.012 m3/s). Sept. 1. DISCHARGE, CUBIC PEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES NOV DEC MAY JUN JUL SEP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC- FT CPSM IN. CAL YR WTR YR 165 287 177 122 112 120 118 396 144 122 113 73 67 76 75 317 111 114 132 e!50 e260 e!90 e!80 e!50 elOO e!30 ellO e90 el40 el20 117 4578 148 396 67 9080 2. 97 3.42 1989 1990 115 110 78 80 64 59 71 86 107 84 66 48 33 56 56 52 110 112 95 95 72 45 34 30 31 33 13 22 17 14 --- 1888 62.9 115 13 3740 1.26 1.41 TOTAL 9600 TOTAL 8754 18 16 8.0 7 .3 8.0 21 21 29 19 7.8 6.9 7.1 7.4 9.5 9.1 7.3 9.0 39 43 22 19 18 18 18 7.7 6.9 6.6 6.5 6.5 6.5 6.8 435.9 14 .1 43 6.5 865 .28 .33 50 MEAN 27 MEAN 7.7 36 47 20 14 8.4 7.4 6.8 6.4 7.2 7.3 7.9 7.2 6.8 6.8 6.8 6. 8 6.8 7.4 8.0 7.4 7.4 7.2 6.6 6.5 6.6 6.5 6.2 5.7 5.9 6.3 305.0 9.84 47 5.7 605 .20 .23 26.3 MAX 24.0 MAX 5.8 5.7 5.6 5.2 5.2 5.3 5.2 5.2 5.6 5.5 .9 .9 .7 .7 .5 .5 .5 .7 .7 .5 .4 .3 4.3 4.3 4.2 4.1 4.2 4.3 ___ _._ --- 135.0 4.82 5.8 4 .1 268 .10 . 10 372 MIN 396 MIN 4.2 4.3 4.3 4.3 4.3 4.3 4.0 3.7 3.4 3.5 3.5 3.4 3.9 3.9 3. 9 .3 .8 .5 .5 . 5 4.5 4.5 4.5 5.1 5.7 5.4 6.2 5.9 5.7 5.5 5.1 139.6 4.50 6.2 3.4 277 .09 .10 2 . 8 AC- 4.8 4.9 5.3 5.4 5.6 5.6 5.4 4 .7 3.9 4.7 4.5 4.7 4.0 3.5 3.3 3.3 3.5 4.5 16 8.0 4.5 4.0 3.6 3.4 4.2 5.2 5.1 4.8 4.9 4.2 --- 149.5 4.98 16 3.3 297 .10 . 11 FT 19040 .68 AC-FT 17360 5.0 5.7 4.8 5.1 4.5 3.4 2. 9 3.3 4.5 4.6 4.5 4.3 4.6 4.0 3.1 2.8 2.9 2.7 2.5 2.3 2.2 3.3 3.5 3.6 3.9 3.7 2.8 2.3 2.0 2.6 2.1 109.5 3 .53 5.7 2.0 217 .07 .08 CPSM . 53 CPSM .48 2.1 2.8 2.3 1.4 2.6 3.3 3.2 2.9 3.3 3.6 3.8 3.3 3.0 4.2 9.4 4.6 2.9 2.3 2.7 2.9 2.5 2.5 2.8 3.0 2.6 2.3 2.2 2.4 2.7 2.9 --- 92.5 3.08 9.4 1.4 183 .06 . 07 IN. 7.17 IN. 6.54 3.2 3.2 2.9 2.6 2.7 3.5 3.4 3.0 2.9 2.5 2.4 2.7 3.5 3.3 4.9 5.1 3.8 3.8 3.0 2.5 2.1 1.9 1.9 2.5 3.0 2.6 2.7 2.6 2.5 2.3 2.0 91.0 2.94 5.1 1.9 180 .06 .07 1.8 1.5 1.6 2.3 3.5 3.1 2.9 2.8 2.6 2.5 2.2 1.9 1.7 1.8 1.9 1.9 2.2 2.5 2.5 2.4 2.1 1.7 1.5 1.7 2.1 2.1 1.8 5.8 3.3 1.2 .89 69.79 2.25 5.8 .89 138 .05 .05 .68 1.3 4.5 7.9 2.1 4.4 1.4 1.0 .90 1.0 1.4 1.7 1.7 15 11 6.8 3.5 2.1 2.0 1.8 1.6 1.7 2.0 24 12 e!90 e60 23 17 357 --- 760.48 25.3 357 .68 1510 .51 .57 e Estimated RIO JACAGUAS BASIN 50111500 RIO JACAGOAS AT JUANA DIAZ, PR — Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS APRIL 1984 TO SEPTEMBER 1985, OCTOBER 1987 TO CURRENT YEAR 339 DATE NOV. 03 1223 DEC. 05 1307 JAN. 18 1535 FEB. 08 1013 MAR. 06 1316 APR. 09 1340 STREAMFLOW, INSTANTANEOUS (CFS) 50.7 8.18 6.70 4.17 3.61 SPECIFIC CON- TEMPERA- DUCTANCE TURE (UMHOS) (DBG C) DATE TIME STREAMFLOW, INSTANTANEOUS (CFS) SPECIFIC CON- TEMPERA- DUCTANCE TURE (UMHOS) (DBG C) 260 340 319 335 333 330 28.5 30.0 26.0 26.5 30.0 30.5 340 THIS PAGE WAS LEFT BLANK INTENTIONALLY ho Grand* de Arecibo Da»tn ^•**w*™# -^""Vf**\ jr / x.--"' ^ i \ ..—v.. ^ -X ! <V—' -., .^—'' / ( SURFACE-WATER STATION AND NUMBER 140 QUALITY-OF-WATER STATION AND NUMBER WELL AND WELL NUMBER 32 i 25760 LAKE-ELEVATION STATION '-Map area E S 4 MILES y ^......-....J..^...........-^ 345 6 KILOMETERS CO Figure 23.—South coast river basins the Rio Inabon to Rio Loco basins 342 RIO INABON BASIN 50112500 RIO INABON AT REAL ABAJO, PR LOCATION.--Lat 18°05'10", long 66°33'46", Hydrologic Unit 21010004, at bridge on private road, off Highway 511 at Hacienda La Concordia, 0.4 mi (0.6 km) upstream from diversion canal, 0.5 mi (0.8 km) north of Real Abajo, and 6.1 mi (9.8 km) northeast of Plaza Degetau in Ponce. DRAINAGE AREA.—9.70 mi a (25.12 kma ). HATER-DISCHARGE RECORDS PERIOD OF RECORD.--1962-63 (annual low-flow measurements only), February to June 1964 (monthly July 1964 to July 1970, April 1971 to current year. GAGE.--Water-stage recorder. Elevation of gage is 410 ft (125 m), from topographic map. nonrecording gage and crest-stage gage at different datum. asurements only), Prior to April 1971 REMARKS.--Records fair except those for estimated daily discharges, which are poor. Gage-height and precipitation satellite telemetry at station. AVERAGE DISCHARGE.—24 years (1965-69, 1972-90), 18.6 ft3/s (0.527 m3/s), 26.04 in/yr (661 mm/yr), 13,480 acre-ft/yr (16.6 hnvVyr); median of yearly mean discharges, 17 ft3/s (0.48 m3 /s), 12,300 acre-ft/yr (15 hm3 /yr) . EXTREMES FOR PERIOD OF RECORD.—Maximum discharge, 19,000 ft3/s (538 m3/s), Oct. 7, 1985, gage height, 25.3 ft (7.71 m), datum then in use, from floodmark, from rating curve extended above 30 ft3 /s (0.850 m3 /s) on basis of contracted opening and flow-over-road measurements of peak flow; minimum daily discharge, 0.80 ftVs (0.023 m3/s), July 23, 1977. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 500 ft3 /s (14.2 m3/s), and maximum (*): Date Oct. 20 Oct. 21 Oct. 23 Time 1700 1640 1900 Discharge (ft3 /s) (mVs) Gage height (ft) (m) 520 *860 650 14.7 24.4 18.4 6.79 *9.67 7.91 2.070 2.947 2.411 Oct. 29 Sept. 9 Time 1555 1700 Discharge (ft 3/s) (m3 /s) 594 682 16.8 19.3 Minimum daily discharge, 0.93 ft'/s (0.030 mVs) , July 13. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES Gage height (ft) (m) 7.41 8.16 2.258 2.487 DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC-FT CFSM IN. 50 42 36 30 29 25 22 60 50 32 24 21 21 23 87 87 74 56 54 91 153 117 104 96 60 76 68 53 86 72 53 1852 59.7 153 21 3670 6.16 7.10 NOV 45 40 37 34 33 31 30 49 60 42 32 28 25 23 22 20 22 20 18 17 16 16 15 14 13 13 12 11 11 11 CAL YR 1989 WTR YR 1990 760 25.3 60 11 1510 2.61 2.91 TOTAL 6572.40 TOTAL 5229.43 DEC 11 10 11 13 11 10 12 9.9 9.7 9.5 9.2 9.2 9.2 8.8 8.5 8.8 8.7 8.5 8.8 8.8 8.7 8.5 8.5 8.5 8.5 8.4 8.1 8.1 9.8 11 40 323.7 10.4 40 8.1 642 1.08 1.24 JAN 28 20 15 12 10 9.2 8.7 8.6 8.6 8.5 8.5 8.3 7.7 7.5 7.7 8.1 8.2 7.5 7.3 7.7 7.4 6.3 5.2 6. 1 5.6 5.8 4.7 4.3 4.6 4.5 4.1 265.7 8.57 28 4.1 527 .88 1.02 FEB 4.1 3.8 3.9 4.1 4.0 3.4 3.3 4.9 4.4 5.4 4.6 9.9 7.7 6.8 7.3 5.7 5.4 6.0 4.8 3.5 3.4 3.1 2.7 2.9 3.1 3.5 3.4 3.0 128.1 4.57 9.9 2.7 254 .47 .49 MAR 3.3 3.9 3.6 2.5 2.9 2.9 3.8 3.7 2.8 3.4 3.8 3.6 4.1 3.6 2.8 2.0 2.0 2.1 2.2 2.6 2.6 2.6 2.4 2.3 1.8 1.7 1.8 1.8 2.1 2.7 2.6 86.0 2.77 4.1 1.7 171 .29 .33 APR 2.7 2.5 2.2 2.2 2.5 2.5 2.5 2.5 2.5 2.5 2.3 2.1 2.6 2.9 2.3 2.8 3.2 7.9 13 9.7 3.8 2.6 2.7 2.9 3.6 8.0 4.4 2.6 1.9 2.0 107.9 3.60 13 1.9 214 .37 .41 MEAN 18.0 MEAN 14.3 MAX 152 MAX 153 MIN MIN 2.1 AC-FT 13040 .93 AC-FT 10370 MAY 3.7 5.3 1.8 1.8 1.7 1.6 2.0 2.5 3.1 3.0 8.3 4.5 3.0 2.3 2.5 2.6 2.1 2.0 2.0 1.7 1.5 1.6 1.6 1.3 1.3 1.3 1.1 1.1 1.5 1.9 1.7 73.4 2.37 8.3 1.1 146 .24 .28 CFSM 1.86 CFSM 1.48 JUN 1.8 1.6 1.4 1.7 2.1 1.6 1.5 1.4 1.3 1.6 2.0 2.0 2.3 3.2 30 9.5 4.6 4.0 4.0 4.3 3.5 3.1 2.7 3.1 3.3 2.8 2.4 2.1 1.9 1.9 108.7 3.62 30 1.3 216 .37 .42 2.0 1.9 1.7 1.4 1.4 1.2 2.5 6.5 2.6 1.6 1.2 1.1 .93 1.0 1.2 1.2 1.2 1.1 1.3 1.3 1.0 1.1 1.6 2.4 2.0 1.7 3.2 2.2 1.8 1.8 1.6 54.73 1.77 6.5 .93 109 .18 .21 AUG 1.6 1.5 2.1 6.1 3.4 4.6 2.8 2.2 2.0 2.4 2.2 1.9 1.6 1.5 1.4 1.3 1.2 1.3 1.3 1.2 1.5 e43 e26 15 7.7 5.6 4.6 19 47 25 10 248.0 8.00 47 1.2 492 .82 .95 SEP 7.6 6.6 44 33 18 23 22 20 104 61 26 19 14 34 38 35 24 16 29 32 21 30 64 83 99 82 59 56 48 73 1221.2 40.7 104 6.6 2420 4.20 4.68 IN. 25.21 IN. 20.06 e Estimated RIO INABON BASIN 50112500 RIO INABON AT REAL ABA JO, PR — Continued WATER QUALITY RECORDS PERIOD OP RECORD.--WATER YEARS AUGUST 1981 TO CURRENT YEAR STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEC C) STREAMFLOW, DATE TIME INSTANTANEOUS (CFS) OCT. NOV. JAN. FEB. MAR. 30 1103 28 1104 29 1058 27 1030 29 1235 APR. 27 1355 72.6 11.6 2.37 4.13 195 280 285 270 283 290 23.0 24.0 23.0 25.0 26.5 27.5 343 Sl'ECIFIC CON- TEMPERA- DUCTANCE TURE (UMHOS) (DBG C) 344 RIO BUCANA BASIN 50113800 RIO CERRILLOS ABOVE LAGO CERRILLOS NEAR PONCE, PR LOCATION.--Lat 18°07'01", long 66°36'17", Hydrologic Unit 21010004, on right bank, 0.3 mi (0.5 km) downstream from confluence with Rio San Patricio, 0.1 mi (0.2 km) southwest of Hwy 139 and 2.4 mi (3.7 km) northwest of MaragQez. DRAINAGE AREA.-- 15.4 mi' (39.9 km 2 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--December 1988 to current year. GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 720 ft (210 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. Gage-height and precipitation satellite telemetry at station. EXTREMES FOR PERIOD OF RECORD.--Maximun discharge, 2,500 ft'/s (70.8 m'/s), Sept. 25, 1990, estimated based on mean daily discharge correlation with nearby station 50115000; minimum discharge, 3.3 ft3 /s (0.093 m3 /s), Aug. 16-18, 20,21, 1990. EXTREMES FOR CURRENT YEAR..--Peak discharges greater than base discharge of 600 ft3/s (17.0 m3 /s) and maximum (*): Date Oct. Oct. Oct. Oct. Oct. 8 16 20 21 23 Time 1430 1730 1700 1630 1815 Discharge (ft3 /s) (m3/s) 768 916 1,040 955 1,280 21.7 25.9 29.4 27.0 36.2 Gage height (ft) (m) 3.78 4.10 4.34 4.18 4.73 1.152 1.250 1.323 1.274 1.442 Date Nov. Sept. Sept. Sept. Sept. 9 3 9 20 25 Time 1445 1545 1645 1645 unknown (ft3 1, 1, *2, Discharge /s) (m3 /s) 666 380 786 030 500 18. 39. 22. 29. 70. .9 ,1 ,3 .2 .8 Gage height (ft) (m) 3 4 3 4 .54 .86 .82 .33 1. 1. 1. 1. 079 481 164 320 unknown Minimunm discharge, 3.3 ft3 /s (0.093 m'/s), Aug. 16-18,20,21. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES NOV DEC JAN FEB APR JUN SEP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC- FT CFSM IN. CAL YR WTR YR 89 67 53 47 43 56 45 129 86 51 42 44 38 50 157 181 133 66 49 130 174 145 183 159 99 104 77 65 90 88 68 2808 90.6 183 38 5570 5.88 6.78 1989 1990 54 47 46 40 49 40 38 85 139 81 48 40 34 32 30 28 28 27 25 24 24 22 22 22 22 21 21 20 19 19 --- 1147 38.2 139 19 2280 2.48 2.77 TOTAL 11943 TOTAL 8371 19 19 19 19 18 20 18 17 17 17 17 16 16 16 16 16 16 16 17 17 16 16 16 16 16 15 13 13 24 16 e!5 522 16.8 24 13 1040 1.09 1.26 4 MEAN 0 MEAN e22 23 18 14 13 12 12 12 11 11 11 11 11 11 11 10 10 10 10 10 9.6 8.7 8.8 9.5 9.5 9.2 8.8 8.3 7.8 7.8 7.6 348.6 11.2 23 7.6 691 .73 .84 32.7 MAX 22.9 MAX 7.4 7.4 7.4 7.1 6.7 6.7 6.5 6.3 6.3 6.2 9.1 7.5 7.4 7.0 6.3 5.7 5.7 5.7 5.7 5.7 5.7 5.7 5.4 5.4 5.4 5.4 5.4 5.4 ___ --- 177.6 6.34 9.1 5.4 352 .41 .43 212 MIN 270 MIN 5.4 5.1 5.1 5.1 4.8 4.8 4.9 4.8 4.5 4.7 4.8 4.9 4.9 5.1 5.0 4.7 5.1 4.8 4.8 4.7 4.7 4.5 4.6 4.8 4.9 4.5 4.5 4.5 4.4 4.3 4.1 4.0 4.0 4.1 4.0 4.0 4.1 4.0 4.0 3.8 3.8 3.9 3.8 4.2 4.7 4.3 4.4 9.4 8.2 40 11 5.6 4.8 4.6 4.5 9.6 7.9 6.8 5.0 4.5 4.5 —— 147.8 191.5 4.77 5.4 4.1 293 .31 .36 5.4 AC- FT 3.3 AC- FT 6.38 40 3.8 380 .41 .46 23690 16600 6.3 6.3 4.9 4.5 4.5 4.5 4.3 4.4 4.3 7.1 8.0 5.9 5.0 4.6 4.5 4.3 4.3 4.3 4.3 4.0 4.0 4.0 3.9 3.7 3.8 3.8 3.8 3.6 3.7 3.6 3.8 142.0 4.58 8.0 3.6 282 .30 .34 CFSM 2 CFSM 1 3.8 3 .8 3.7 7.2 7.7 4.7 4.5 4.2 4.3 4.2 4.0 4.1 4.6 5.7 40 9.9 6.0 5.4 5.8 5.5 5.1 4.8 5.8 6.8 5.9 5.1 4.8 4.6 4.5 4.5 --- 191.0 6.37 40 3 .7 379 .41 .46 12 IN. 49 IN. .5 .5 .5 .5 .6 4.6 6.8 7.6 4.7 4.2 4.0 4.0 3.9 3.8 4.9 5.9 4.3 4.2 4.2 4.0 3.8 3.8 4.5 5.0 4.5 4.9 6.3 5.7 4.3 4.0 3.9 144.4 4.66 7.6 3.8 286 .30 .35 28.85 20.22 3.8 4.2 4.7 4.5 20 6.5 4.3 4.0 4.2 4.5 4.0 3.6 3.6 3.6 3.6 3.3 3.3 3.9 3.6 3.4 4.3 40 21 12 6.8 6.0 5.4 34 77 33 16 352.1 11.4 77 3.3 698 .74 .85 13 14 121 40 18 60 34 27 128 69 27 21 21 47 65 42 26 20 82 133 67 e60 e56 e220 e270 e76 e66 e!20 e76 e!80 --- 2199 73.3 270 13 4360 4.76 5.31 Estimated RIO BUCANA BASIN 50114000 RIO CERRILLOS NEAR PONCE, PR Location.--Lat 18°04'15", long 66°34'51", Hydrologic unit 21010004, on right bank of (3.7 km) upstream from Quebrada Ausubo and 4.6 mi (7.4 km) northeast of Plaza Deg DRAINAGE AREA.--17.8 mi 2 (46.1 km 2 ) WATER-QUALITY RECORDS PERIOD OF RECORD.--Water years 1964 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 345 E Highway 139, 2.3 mi 2tau in Ponce. OCT 20 DEC 06 FEB 08 APR 12 JUN 12 AUG 07 OCT 20 DEC 06 FEB 08 APR 12 JUN 12 AUG 07 DIS- OXYGEN, OXY CHARGE, SPE- DIS- DEM INST. CIFIC SOLVED CH CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- 1C FEET DUCT- (STAND- ATURE BID- DIS- CENT (H DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEV SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG 1989 1125 65 291 8.10 24.0 65 8.2 97 1145 16 314 8.00 23.5 190 6.3 74 1990 1100 12 276 7.90 22.0 140 8.0 91 1110 3.1 347 7.70 24.0 150 8.0 94 1125 3.0 291 7.80 29.5 110 6.7 87 1030 e3.0 291 8.10 26.5 180 5.2 64 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY NESS NONCARB CALCIUM SIUM, SODIUM, AD- SIUM, WAT WH TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SUL (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TO DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (M CACO3) CAC03 AS CA) AS MG) AS NA) AS K) CACO3 AS 1989 130 0 40 6.5 9.5 0.4 1.3 140 190 1990 170 95 5 30 4.9 7.9 0.4 1.1 500 110 110 8 34 5.5 8.9 0.4 1.2 100 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 SOLVED (MG/L DIS- (TONS SOS- TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) OCT 1989 20... 0.10 23 186 32.5 17 0.97 0.03 1.0 DEC 06... -- -- -- -- 242 0.77 0.03 0.80 FEB 1990 08... -- -- -- -- 247 0.48 0.12 0.60 APR 12... 0.10 20 137 1.18 265 0.29 0.01 0.30 JUN 12... -- -- -- -- 228 0.38 0.02 0.40 AUG 07... <0.10 20 150 -- 26 0.47 0.03 0.50 SEN COLI- STREP- &ND, FORM, TOCOCCI EM- FECAL, FECAL, MJ 0.7 KF AGAR IGH UM-MF (COLS. BL) (COLS./ PER /L) 100 ML) 100 ML) 15 K130 260 35 200 200 26 K50 210 20 K910 400 84 K120 K130 10 K540 480 CHLO- SULFATE RIDE, FIDE DIS- DIS- TAL SOLVED SOLVED G/L (MG/L (MG/L S) AS S04) AS CL) <0.5 15 6.5 __ __ <0.5 15 6.4 __ 15 6.2 NITRO- NITRO- GEN, GEN, AMMONIA ORGANIC TOTAL TOTAL (MG/L (MG/L AS N) AS N) 0.04 0.16 0.04 0.36 0.19 0.11 0.04 0.04 0.96 0.05 1.0 e = estimated K = non-ideal count 346 RIO BUCANA BASIN 50114000 RIO CERRILLOS NEAR PONCE, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 20. .. DEC 06.. . FEE 1990 08. .. APR 12.. . JUN 12.. . AUG 07.. . DATE OCT 1989 20. . . DEC 06. . . FEE 1990 08. . . APR 12. .. JUN 12.. . AUG 07 ... NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.20 0.40 0.30 <0.20 1.0 1.1 IRON, TOTAL RECOV- ERABLE (UG/L AS FE) NITRO- GEN, TOTAL (MG/L AS N) 1.2 1.2 0.90 -- 1.4 1.6 LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) NITRO- GEN, TOTAL (MG/L AS NO3) 5.3 5.3 4.0 -- 6.2 7.1 MANGA- NESE, TOTAL RECOV- ERABLE (DG/L AS MM) PHOS- PHORUS TOTAL (MG/L AS P) 0.09 0.25 0.10 0.12 1.9 0.19 MERCURY TOTAL RECOV- ERABLE (UG/L AS HG) ARSENIC TOTAL (UG/L AS AS) <1 -- -- <1 -- -- SELE- NIUM, TOTAL (UG/L AS SB) BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 - - 300 - -- SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) BORON, TOTAL RECOV- ERABLE (UG/L AS B) <10 -- -- 30 -- -- ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- 1 -- -- CYANIDE TOTAL (MG/L AS CN) CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) 2 -- -- 4 -- -- PHENOLS TOTAL (UG/L) COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) 20 — — 20 -- -- METHY- LENE BLUB ACTIVE SUB- STANCE (MG/L) 4600 6800 <0.10 <0. 10 <1 <1 10 30 <0.010 <1 0.04 0.06 RIO BUCANA BASIN 50114390 RIO BUCANA AT HWY 14 BRIDGE NEAR PONCE, PR 347 LOCATION.--Lat 18°02'29", long 66°34'58", Hydrologic Unit 21010004, on left bank, 200 ft (61 m) upstream from bridge on Highway 14, 0.2 mi (0.3 km) southeast of Escuela Cerrillos, and 2.8 mi (4.5 km) northeast of pegetau Plaza in Ponce. DRAINAGE AREA.--24.9 mi a (64.5 km'). WATER-DISCHARGE RECORDS PERIOD OP RECORD.—October 1985 to September 1986 (maximum only), published as "Rio Bucana Flood' Highway 14 bridge", October 1986 to July 1987 (maximum only), August 1987 to current year. GAGE.--Water-stage recorder and crest-stage gage. Datum of gage is 116.40 ft (35.500 m) above mean sea level. Prior to Oct. 1, 1986, crest-stage gage located at Highway 14 bridge, at elevation of mean sea REMARKS.--Records fair. Only minor regulation of low flow at present. Gage-height and precipita telemetry at station. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge 17,400 ft3 /s (493 m3 /s), Oct. 7, 1985, gage hei level. tion satellite ght, 13.48 ft (4.109 m), (previously published as 129.88 ft (39.59 m) near sea level from floodmark and ratiig curve extended above 200 ft3 /s (5.66 m} /s), on basis of step-backwater analysis; minimum daily discharge, 3.9 June 29, 1990, result of regulation. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,600 ftVs (45.3 m3 /s Discharge Date Oct. Oct. Oct. Oct. Oct. 8 15 16 20 21 Time 1725 1725 2010 1900 1915 (ft3 /s) 2, 2, 2, 2, 2, 030 550 180 470 010 (mVs) 57. 72, 61. 69. 56. .5 .2 .7 .9 .9 Gage height (ft) 7. 7. 7. 7. 7. .08 .64 .25 .56 .06 2 2 2 2 2 (m) .158 .329 .210 .304 .152 Date Oct. Nov. Sept. Sept. 23 9 9 24 Time 2015 1730 1845 1900 (ft *2 1 2 1 Discharge Vs) ,990 ,970 ,120 ,620 (mVs 84 55 60 45 ) .7 .8 .0 .9 Gage (ft) *8.05 7.01 7.18 6.58 height (m) 2.454 2.137 2.188 2.006 Minimum daily discharge, 3.9 ft3 /s (0.110 m'/s), June 29. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES ay Channel at ft'/s (0.110 m3 /s). ) and maximum (*): DAY OCT NOV DEC FEB JUN SEP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC-FT CFSM IN. CAL YR WTR YR 405 204 142 95 92 104 87 399 313 126 86 73 87 98 550 666 567 251 143 432 704 539 602 579 294 292 228 147 223 240 171 8939 288 704 73 17730 11.6 13.35 1989 1990 134 92 79 74 76 78 55 182 534 328 119 81 62 53 46 36 34 34 30 29 30 31 37 30 28 28 28 25 24 24 2441 81.4 534 24 4840 3.27 3.65 TOTAL 27742 TOTAL 19005 22 23 22 22 20 21 24 20 19 18 18 17 17 17 16 16 16 15 15 15 15 14 14 14 14 14 12 12 13 25 46 566 18.3 46 12 1120 .73 .85 .3 MEAN .8 MEAN 105 47 36 18 15 14 13 12 11 11 12 11 10 9.1 9.7 9.4 9.4 9.3 8.1 8.8 8.6 9.1 7.7 8.8 7.8 9.2 8.8 9.5 8.7 8.0 7.0 472.0 15.2 105 7.0 936 .61 .71 76.0 MAX 52.1 MAX 7.3 7.2 7.0 7.0 7.0 6.9 7.2 8.0 8.0 8.2 7.5 14 9.5 8.9 9.0 7.9 7.9 7.9 7.4 8.0 7.5 7.5 7.3 6.5 6.2 7.1 6.7 6.6 ___ ___ --- 217.2 7.76 14 6.2 431 .31 .32 953 MIN 704 MIN 6.8 6.8 6.6 6.7 6.7 5.9 6.0 6.4 6.1 6.4 6.6 6.4 5. 6 6.4 6.4 5.8 6.5 6.3 5.6 5.2 5.2 5.1 5.1 5.3 5.6 5.5 4.8 4.8 4.3 4.5 4.6 180.0 4.5 4.6 4.2 4.3 4.5 4.5 4.5 4.4 4.5 4.2 4.2 4.2 4.8 5.7 5.8 5.4 5.1 14 120 52 13 7.8 6.8 6.1 5.8 26 12 9.4 7.1 6.2 --- 365.6 5.81 12.2 6.8 4.3 357 .23 .27 5.4 3.9 120 4.2 725 .49 .55 AC-FT 55030 AC-FT 37700 5.8 9.4 6.6 5.8 5.5 5.4 5.2 5.2 5.6 5.7 12 9.8 8.3 6.6 6.9 5.8 4.6 4.9 5.0 5.2 5.5 5.0 5.0 4.8 4.7 4.6 4.8 5.1 5.2 4.3 4.4 182.7 5.89 12 4.3 362 .24 .27 CFSM 3 CFSM 2 4.8 4.3 4.7 4.7 12 6.2 5.4 5.3 5.0 5.4 5.2 4.3 5.0 6.7 42 33 9.0 7.9 9.2 7.5 6.2 5.2 5.3 7.8 6.9 5.5 5.1 4.6 3.9 4.6 --- 242.7 8.09 42 3.9 481 .32 .36 05 IN. 09 IN. 5.1 4.7 4.3 4.3 4.7 4.9 4.8 8.7 5.4 4.8 4.7 4.8 4.7 4.3 7.0 8.2 6.1 5.9 5.7 5.3 5.0 5.1 6.1 9.5 7.0 8.6 9.5 9.5 7.3 6.2 6.2 188.4 6.08 9.5 4.3 374 .24 .28 41.45 28.39 6.4 6.3 7.4 11 13 18 9.5 7.7 7.4 8.1 8.1 7.8 7.5 7.7 7.5 7.8 7.3 6.7 6.6 6.6 8.0 32 32 20 10 9.8 10 21 93 104 22 530.2 17.1 104 6.3 1050 .69 .79 14 13 238 153 42 58 98 48 329 260 60 53 33 188 161 94 55 41 133 334 225 113 245 303 338 263 151 182 145 311 4681 156 338 13 9280 6.27 6.99 348 RIO BUCANA BASIN 50114390 RIO BOCANA AT HWY 14 BRIDGE NEAR PONCE, PR—Continued WATER QUALITY RECORDS PERIOD OP RECORD.--OCTOBER 1987 TO SEPTEMBER 1988 TO CURRENT YEAR NOV. DEC. JAN. FEB. MAR. APR. TIME 16 0831 05 1145 19 1125 08 1209 13 1520 06 1347 STREAM?LOW, INSTANTANEOUS (CPS) 35.5 20.2 9.30 6.22 4.62 SPECIFIC CON- TEMPERA- DUCTANCE TURE (UMHOS) (DEG C) STREAM?LOW, INSTANTANEOUS (CFS) SPECIFIC CON- TEMPERA- DUCTANCE TURE (UMHOS) (DEG C) 22.5 305 309 285 308 304 0831 24.5 23.5 27.5 27.0 28.0 RIO PORTUGDES BASIN 50115000 RIO PORTUGUES NEAR PONCE, PR LOCATION.--Lat 18°04'45", long 66°38'01", Hydrologic Unit 21010004, on right bank 30 ft (9 10) upstream from bridge on Highway 504, 0.2 mi (0.3 km) upstream from small unnamed tributary, 4.4 Rio Chiquito, and 4.7 mi (7.6 km) north of Plaza Degetau in Ponce. DRAINAGE AREA.--8.82 mi' (22.84 km»). (7.1 WATER-DISCHARGE RECORDS PERIOD OP RECORD.—February to June 1964 (monthly measurements only), July 1964 to current year. GAGE.--Water-stage recorder. Elevation of gage is 470 ft (143 m), from topographic map. Prior to Dec. 4, 1964, non-recording gage at same site and datum. REMARKS.--Records fair. Some low-flow regulation due to unknown activity upstream. Gage-height and precipitation satellite telemetry at station. AVERAGE DISCHARGE.--26 years (1965-90), 18.9 ft3 /s (0.535 m3 /s) , 29.10 in/yr (739 mm/yr), 13 (16.9 hmVyr); median of yearly mean discharges, 18.6 ft3 /s (0.53 mVs), 13,500 acre-ft/yi: (17 hmVyr) . EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 21,000 ftVs (595 m3/s), Oct. 7, 1985, gage height, 20.2 ft (6.16 m), from floodmarks at downstream side of bridge, from rating curve extended above 150 ft3 /s (4.25 m3 /s) on basis of slope-area measurement of peak flow; minimum discharge, 1.0 ft 3/s May 29, 1973. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 800 ftVs (22.6 irVs) and maximum (*): Date Oct. 20 Sept. 24 Time 1710 1630 Discharge (ftVs) (mVs) 1,380 1,430 39.1 40.5 Gage height (ft) (m) 7.07 2.155 7.17 2.185 Date Time (ft 3 /s) Sept. 25 1710 * 1,470 Discharge (m3 /s) 349 km) upstream from ,690 acre-ft/yr (0.028 mVs) , 41.6 Minimum discharge, 1.4 ftVs (0.040 mVs), Apr. 12,13. OCT DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES NOV DEC MAR JUN JUL Gage height (ft) (m) *7.25 2.210 AUG SEP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC- FT CFSM IN. CAL YR WTR YR 65 48 38 31 27 55 42 77 54 35 28 31 30 25 99 96 87 56 43 149 98 83 105 90 60 53 46 59 60 67 51 1888 60.9 149 25 3740 6.91 7.96 1989 1990 44 37 34 31 36 31 28 50 90 51 33 27 23 21 19 19 19 17 16 15 15 14 13 13 13 13 12 12 11 11 --- 768 25.6 90 11 1520 2.90 3.24 TOTAL 9357 TOTAL 5274 11 11 11 10 10 10 10 9.4 9.3 9.0 8.7 8.6 8.5 8.2 8.0 8.0 7.8 7.5 7.5 7.4 7.3 7.2 7.1 6.7 6.8 6.6 6.1 6.0 25 12 20 291.7 9.41 25 6.0 579 1.07 1.23 7 MEAN 3 MEAN 13 15 11 7.4 6.3 5.9 5.8 5.3 5.4 5.4 5.3 5.3 5.1 .8 .9 .9 .8 .7 .6 .7 .5 .4 4.4 4.6 4.2 4.9 4.6 4.3 4.0 3.9 3.8 177.2 5.72 15 3.8 351 .65 .75 25.6 MAX 14 . 5 MAX 3.7 3.7 3.6 3.7 3.7 3.6 3.5 4.0 4.1 4.0 3.8 4.1 4 .1 3.7 3.4 3.3 3.4 3.4 3.3 3.2 3 .2 3.3 3.1 3.1 3.0 2.9 2.9 3.1 .__ ___ --- 97.9 3.50 4.1 2.9 194 .40 .41 270 MIN 17 6 MIN 3.0 3.0 2.9 2.8 2.9 2.9 3.0 3.0 2.8 2.8 2.6 2.7 2.7 2.9 2.7 2.5 3.1 3.7 2.5 2.4 2.3 2.2 2.4 2.4 2. 6 2.2 2.1 2.2 2.2 2.2 2.0 81.7 2.64 3.7 2.0 162 .30 .34 2.2 AC-FT 1.5 AC-FT 1.9 1.9 2.0 1.8 1.8 1.8 1.7 1.6 1.6 1.5 1.6 1.5 2.0 2.6 1.7 1.7 8.3 5.6 43 13 4.1 2.9 2.6 2.6 9.9 9.4 7.5 3.9 3.2 3.0 --- 147.7 4.92 43 1.5 293 .56 .62 18560 10460 11 8.0 3.5 2.9 2.7 2.5 2.4 2.6 2.6 3.1 3.9 2.8 3.7 2.7 2.6 2.6 2.5 2.5 2.5 2.4 2.4 2.5 2.4 2.5 2.5 2.5 2.8 2.8 2.9 2.7 2.9 98.4 3.17 11 2.4 195 .36 .42 CFSM 2.91 CFSM 1.64 2.7 2.5 2.5 8.1 7.6 2.6 2.1 2.1 1.9 1.9 1.9 1.9 2.2 2.3 38 10 4.2 3.3 4.7 3.2 2.5 2.1 4.3 6.9 7.7 3.6 2.8 2.5 2.4 2.4 --- 142.9 8 4.76 2 38 1.9 283 .54 .60 IN. 39.47 IN. 22.25 2.3 2.2 2.1 2.1 2.1 2.2 2.2 2.3 2.0 2.0 2.3 2.3 2.2 2.2 3.3 3.6 2.4 2.2 3.1 2.4 2.2 2.2 5.3 6.0 4.0 5.7 5.6 2.6 2.2 2.2 2.0 7.5 .82 6.0 2.0 174 .32 .37 2.2 2.3 3.2 8.3 19 7.2 3.3 3.4 2.6 4.1 2.8 2.1 2.0 2.3 1.8 1.6 3.0 5.6 2.2 1.8 2.0 5.6 3.8 2.6 2.4 1.9 1.6 14 18 8.5 3.2 144.4 4.66 19 1.6 286 .53 .61 2.7 5.1 42 17 5.8 9.5 15 28 66 30 9.3 6.5 5.0 71 100 44 16 11 27 57 56 43 42 135 176 49 42 76 49 113 --- 1348.9 45.0 176 2.7 2680 5.10 5.69 350 RIO PORTUGUBS BASIN 50115000 RIO PORTOGDES NEAR PONCE, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORD.--Water years 1964 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 20. .. DEC 06. .. PBB 1990 08. .. APR 12. .. JUN 12. .. AUG 07. .. TIME 0915 0950 0910 0850 0920 0850 HARD- NESS TOTAL (MG/L DIS- CHARGE, INST. CUBIC FEET PER SECOND 34 9.7 4.2 1.6 1.8 3.3 HARD- NESS NONCARB WH WAT TOT FLD SPE- CIFIC CON- DUCT- ANCE (US/CM) 289 316 330 323 319 286 CALCIUM DIS- SOLVED PH (STAND- ARD UNITS) 8.20 8.40 8.10 8.10 8. 00 8.40 MAGNE- SIUM, DIS- SOLVED TEMPER- ATURE WATER (DEG C) 21.5 21.5 20.0 22.0 25.5 24.0 SODIUM, DIS- SOLVED TUR- BID- ITY (NTU) 2.6 0.70 4.2 1.5 1.1 12 SODIUM AD- SORP- TION OXYGEN, DIS- SOLVED (MG/L) 8.9 12.9 8.7 9.4 8.2 7.2 POTAS- SIUM, DIS- SOLVED OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 101 145 95 108 100 85 ALKA- LINITY WAT WH TOT FBT FIELD OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 12 14 15 18 14 13 SULFIDE TOTAL COLI- FORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) K750 390 K150 240 K150 2400 SULFATE DIS- SOLVED STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) 450 K160 240 250 290 2300 CHLO- RIDE, DIS- SOLVED AS MG/L AS (MG/L (MG/L (MG/L (MG/L MG/L AS (MG/L (MG/L (MG/L CACO3) CACO3 AS CA) AS MG) AS NA) AS K) CACO3 AS S) AS S04) AS CL) OCT 20 DEC 06 FBB 08 APR 12 JUN 12 AUG 07 1989 1990 DATE OCT 1989 20. . . DEC 06. . . FBB 1990 08. .. APR 12.. . JUN 12.. . AUG 07. .. 130 0 41 6.5 9.8 __ -_ 150 0 37 15 28 190 0 46 18 44 130 9 20 7.0 40 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL RIDE, DIS- CONSTI- DIS- AT 105 DIS- SOLVED TUENTS, SOLVED DEG. C, SOLVED (MG/L DIS- (TONS SUS- (MG/L AS SOLVED PER PBNDED AS F) SIO2) (MG/L) DAY) (MG/L) 0.10 22 174 16.1 4 <1 24 0.10 29 250 1.11 4 0.10 25 302 1.45 <3 0.10 20 171 1.55 13 0.4 1.3 _ _ 1 3.6 1 3.0 0.4 2.0 NITRO- NITRO- GEN, GEN, NITRATE NITRITE TOTAL TOTAL (MG/L (MG/L AS N) AS N) 1.39 0.01 1.08 0.02 <0.01 <0.01 <0.01 0.89 0.01 130 140 150 94 150 120 NITRO- GEN, N02+N03 TOTAL (MG/L AS N) 1.4 1.1 0.90 0.50 0.30 0.90 <0.5 8.0 7.3 __ __ <0.5 18 37 <0.5 29 47 9.1 9.6 NITRO- NITRO- GEN, GEN, AMMONIA ORGANIC TOTAL TOTAL (MG/L (MG/L AS N) AS N) 0.02 0.28 0.03 0.27 <0.01 0.01 0.02 0.04 0.36 non-ideal count RIO PORTUGOES BASIN 50115000 RIO PORTUGUES NEAR PONCE, PR—Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 351 DATE OCT 1989 20. .. DEC 06. . . FEB 1990 08.. . APR 12.. . JUN 12.. . AUG 07.. . DATE OCT 1989 20. . . DEC 06.. . PEB 1990 08. .. APR 12.. . JUN 12.. . AUG 07. .. NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.30 0.30 <0.20 <0.20 <0.40 0.40 IRON, TOTAL RECOV- ERABLE (UG/L AS FE) 270 -- -- 310 250 -- NITRO- NITRO- GEN, GEN, TOTAL TOTAL (MG/L (MG/L AS N) AS N03) 1.7 7.5 1.4 6.2 __ __ __ 1.3 5.8 MANGA- LBAD, NESE, TOTAL TOTAL RECOV- RECOV- ERABLE ERABLE (UG/L (UG/L AS PB) AS MN) 11 10 __ __ 9 60 1 40 __ BARIUM, PHOS- TOTAL PHORUS ARSENIC RECOV- TOTAL TOTAL ERABLE (MG/L (UG/L (UG/L AS P) AS AS) AS BA) 0.05 <1 <100 0.05 0.04 0.04 2 <100 0.04 1 <100 0.04 MERCURY SILVER, TOTAL SELE- TOTAL RECOV- NIUM, RECOV- ERABLE TOTAL ERABLE (UG/L (UG/L (UG/L AS HG) AS SE) AS AG) <0.10 <1 <1 __ __ <0.10 <1 <1 <0.10 <1 <1 _- BORON, CA TOTAL T RECOV- R ERABLE E (UG/L ( CHRO- DMIUM MIUM, COPPER, OTAL TOTAL TOTAL ECOV- RECOV- RECOV- RABLB ERABLE ERABLE JG/L (UG/L (UG/L AS B) AS CD) AS CR) AS CU) <10 -- -- 20 60 " ZINC, TOTAL RECOV- CY ERABLE T (OG/L ( AS ZN) A <1 <1 10 __ __ 1 1 <10 <1 <1 10 .. METHY- LENE BLUE UJIDE ACTIVE 3TAL PHENOLS SUB- 4G/L TOTAL STANCE 3 CN) (UG/L) (MG/L) <10 <b.010 1 0.02 -- __ __ 10 <b.010 7 0.14 <10 <j).010 5 0.16 __ 352 RIO PORTUGUES BASIN 50116200 RIO PORTUGUES AT PONCE, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°00'20 n , long 66 036'28 M , 1,300 ft (400 m) south of Las Americas Avenue Bridge, 1.2 mi (1.9 km) south of CSC 50115900, 0.8 mi (1.3 km) west of Highways 1 and 2 junction, and 0.7 mi (1.1 km) southeast of Ponce. DRAINAGE AREA.--18.9 mi 1 (49.0 km 2 ). PERIOD OP RECORD.—Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 23. .. DEC 08. .. FEB 1990 09. .. APR 10. .. JUN 22. .. AUG 03. .. TIME 0915 0900 0920 0925 0850 0835 DIS- CHARGE, INST. CUBIC FEET PER SECOND 83 8.0 3.8 4.1 5.4 5.0 SPE- CIFIC CON- DUCT- ANCE (US/CM) 265 419 519 494 461 475 PH (STAND- ARD UNITS) 8.10 7.70 7.70 8.20 7.40 7.60 TEMPER- ATURE WATER (DEG C) 23.0 22.0 21.5 23.5 27.0 26.5 TUR- BID- ITY (NTU) 15 2.5 1.0 11 5.8 7.5 OXYGEN, DIS- SOLVED (MG/L) 9.0 7.2 6.6 7.7 4.4 4.3 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 103 81 73 90 54 52 OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 18 <10 <10 23 23 23 COLI- FORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) 3600 K6500 K13000 5400 5700 2800 STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) 2300 400 K1000 430 K1500 K1700 DATE OCT 1989 23. .. DEC 08. .. FEB 1990 09. . . APR 10. . . JUN 22. . . AUG 03. .. HARD- NESS TOTAL (MG/L AS HARD- NESS MAGNE- NONCARB CALCIUM SIUM, SODIUM, WH WAT DIS- DIS- DIS- SOLVED SOLVED SOLVED (MG/L (MG/L (MG/L TOT FLD MG/L AS CACO3) CACO3 88 150 AS CA) AS MG) AS NA) 21 8.6 13 40 11 46 11 42 32 SODIUM AD- SORP- TION RATIO POTAS- SIUM, DIS- SOLVED AS K) 0.6 3.5 2 3.4 1 1.9 ALKA- LINITY WAT WH TOT FET FIELD (MG/L MG/L AS SULFIDE TOTAL (MG/L CACO3 96 140 150 140 130 130 CHLO- SULFATE RIDE, DIS- DIS- SOLVED SOLVED (MG/L <0.5 12 <0.5 57 47 (MG/L AS S) AS SO4) AS CL) 8.3 35 31 OCT 23 DEC 08 FEB 09 APR 10 JUN 22 AUG 03 K = FLUO- RIDE, DIS- SOLVED DATE (MG/L AS F) 1989 0.10 1990 0.20 0.70 non- ideal count SILICA, DIS- SOLVED (MG/L AS SIO2) 22 -- -- 22 -- 21 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 146 -- _- 292 -- 269 RESIDUE SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) 3.23 3.60 29 2 17 22 23 18 1. 0. 0. - 0. 0. 29 48 26 - 06 29 0. 0. 0. 0. 0. 0. 01 02 04 02 04 11 1 0 0 <0 0 0 .3 .50 .30 .10 .10 .40 0. 0. 0. 0. 0. 0. 03 06 08 04 24 13 0. 0. 0. 0. 0. 0. 17 34 42 36 86 77 RIO PORTUGUES BASIN 50116200 RIO PORTUGUES AT PONCE, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 353 DATE OCT 1989 23.. . DEC 08.. . PEB 1990 09. . . APR 10. .. JUN 22. . . AUG 03. .. DATE OCT 1989 23.. . DEC 08. .. PEB 1990 09. .. APR 10. . . JUN 22.. . AUG 03.. . NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.20 0.40 0.50 0.40 1.1 0.90 IRON, TOTAL RECOV- ERABLE (UG/L AS PE) 1300 -- -- 1100 -- -- NITRO- GEN, TOTAL (MG/L AS N) 1.5 0.90 0.80 -- 1.2 1.3 LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) 2 -- -- 6 -- -- NITRO- GEN, TOTAL (MG/L AS N03) 6.6 4.0 3.5 -- 5.3 5.8 MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) 40 -- -- 70 -- -- PHOS- PHORUS TOTAL (MG/L AS P) 0.06 0.05 0.07 0.07 0.10 0.06 MERCURY TOTAL RECOV- ERABLE (UG/L AS HG) <0.10 -- -- <0.10 -- -- BARIUM, TOTAL ARSENIC RECOV- TOTAL ERABLE (UG/L (UG/L AS AS) AS BA) <1 <100 _- __ <1 <100 _- ._ SILVER, SELE- TOTAL NIUM, RECOV- TOTAL ERABLE (UG/L (UG/L AS SB) AS AG) <1 <1 __ __ <1 <1 __ __ BORON, TOTAL RECOV- ERABLE (UG/L AS B) 20 -- -- 210 -- "" ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) <10 -- -- 10 -- -- CAI TC RI El (I AS CYJ TC tt AS <0 MI DM TAL COV- JIBLE G/L CD) <1 -- -- 2 -- "" HIDE TAL G/L CN) .010 -- -- <c|.oio -- -- CHRO- MIUM, COPPER, TOTAL TOTAL RECOV- RECOV- ERABLE ERABLE (UG/L (UG/L AS CR) AS CU) <1 10 __ __ 3 10 __ .. METHY- LENE BLUE ACTIVE PHENOLS SUB- TOTAL STANCE (UG/L) (MG/L) 1 0.03 __ __ <1 0.02 __ __ 354 LOCATION.--Lat 18°02'40' of Highways 2 and 132, Plaza de Guayanilla. RIO GDAYANILLA BASIN 50124200 RIO GDAYANILLA NEAR GUAYANILLA, PR , long 66°47'53", Hydrologic Unit 21010004, on left bank, 0.7 mi (1.1 km) north of junction 0.6 mi (1.0 km) downstream from Quebrada Consejo, 1.8 mi (2.9 km) north-northwest from DRAINAGE AREA.--18.9 mi 1 (49.0 km 1 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--March 1981 to current year. GAGE.--Water-stage recorder. Elevation of gage is 80 ft (24 m) , from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. Gage-height and precipitation satellite telemetry at station. AVERAGE DISCHARGE.--9 years (1982-90), 23.5 ftVs (0.666 m'/s), 16.88 in/yr (429 mm/yr), 17,020 acre-ft/yr (21.0 hmVyr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 14,700 ft'/s (416 mVs) , Sept. 12, 1982, gage height, 20.4 ft (6.2 m), from floodmarks, from rating curve extended above 100 ftVs (2.83 mVs) on basis of step-backwater analysis and indirect measurement of peak flow; minimum daily discharge, 0.97 ft'/s (0.027 m3 /s), Aug. 21, 1990. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 800 ft'/s (22.6 mVs) and maximum (*): Date Oct. 19 May 2 Discharge Time (ft'/s) (mVs) Gage height (ft) (m) Discharge Time (ft'/s) (mVs) 1600 1525 872 910 24.7 25.8 9.45 9.54 2.880 2.908 Sept. 25 Sept. 26 1730 1800 918 26.0 27.7 Minimum daily discharge, 0.97 ft'/s (0.027 m3 /s), Aug. 21. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES DAY NOV DEC MAY JUN Gage height (ft) (m) 9.56 2.914 *9.70 2.956 SEP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC -FT CFSM IN. CAL YR WTR YR 106 82 58 50 47 70 59 56 51 43 62 42 66 47 38 64 57 46 119 125 92 90 79 57 44 38 34 33 63 51 37 1906 61.5 125 33 3780 3.25 3.75 1989 1990 32 28 27 29 39 37 45 108 54 40 83 63 42 34 30 28 25 23 21 20 18 17 16 15 17 19 17 16 14 14 --- 971 32.4 108 14 1930 1.71 1.91 TOTAL 9088. TOTAL 6728, 13 13 13 13 12 12 11 10 9.7 9.7 9.7 10 10 9.3 9.7 10 11 12 12 12 12 13 14 16 16 15 14 13 26 20 11 392.1 12.6 26 9.3 778 .67 .77 ,8 MEAN ,27 MEAN 12 13 9.9 9.2 9. 1 9.6 9.4 8.3 8.6 9.1 9.6 10 11 10 10 10 9.1 8.4 8.0 8.1 7.6 6.7 6.0 5.4 5.2 5.0 6.6 5.2 4.5 4.0 3.7 252.3 8.14 13 3.7 500 .43 .50 24.9 MAX 18.4 MAX 3.6 3.3 3.3 3.0 2.9 2.6 2.5 3.6 3.2 3.2 2.5 2 .8 2 .9 3.0 2 .9 2.5 2.5 3.9 3.3 2.9 2.9 3.0 2.6 2.5 2.3 6.9 3.6 2.6 ___ __. --- 86.8 3.10 6.9 2.3 172 .16 .17 169 MIN 190 MIN 2.8 2. 6 2.5 2.5 2.3 2.0 2.2 2.5 2.0 1.9 2.2 2.3 2.0 5.4 2.3 2.6 7.5 12 3.3 2.9 2.6 2.9 2.9 6.0 6.1 4.2 3.7 3.7 3.4 2.6 2.4 106.3 3.43 12 1. 9 211 .18 .21 2.1 .97 2.0 1.8 1.8 1.9 2.3 2.1 2.1 2.2 2.3 2.2 1.9 1.9 1.4 1.8 2.1 1.9 3.3 1.9 39 29 9.0 5.9 5.7 5.7 14 30 15 5.7 5.2 4.9 --- 206.0 6.87 39 1.4 409 .36 .41 AC-FT 18030 AC-FT 13350 90 190 50 21 12 8.6 7.3 10 7.8 6.4 5.8 11 16 9.7 8.4 7.3 6.6 5.4 5.3 4.8 4.2 4.0 3.6 3.1 2.8 2.6 2.6 2.5 3.1 2.5 2.6 517.0 16.7 190 2.5 1030 .88 1.02 CFSM CFSM 2.4 2.5 2.6 3.6 2.7 2.5 33 29 9.4 5.2 4.0 3.4 3.4 6.0 87 37 19 elO e3.9 e3.3 e60 e5.0 e3.2 e3.2 e!3 e7.0 e5.8 e4.6 4.1 4.0 --- 379.8 12.7 87 2.4 753 .67 .75 1.32 IN. 17 .98 IN. 13 3.4 3.3 3.4 3.6 3.3 3.3 3.3 3.7 3.0 2.6 2.4 2.1 2.0 1.8 3.0 5.3 4. 1 3.4 2.8 2.5 2.0 5.6 7.1 21 17 14 13 6.4 5.1 4.5 3.7 161.7 5.22 21 1.8 321 .28 .32 .89 .24 50 25 7.9 11 43 28 9.9 5.8 4.9 8.4 3.2 2.1 1.9 1.8 1.4 1.2 1.5 4.3 1.4 1.2 .97 16 9.6 3.4 2.3 1.8 1.5 1.4 6.6 3.5 1.3 262.27 8.46 50 .97 520 .45 .52 37 76 93 60 23 17 27 44 58 30 20 21 14 37 72 49 27 20 17 14 31 38 75 93 114 123 61 49 39 108 --- 1487 49.6 123 14 2950 2.62 2.93 e Estimated RIO GOAYANILLA BASIN 50124200 RIO GUAYANILLA NEAR GUAYANILLA, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS AUGUST 1981 TO SEPTEMBER 1985, OCTOBER 1987 TO CURRENT YEAll 355 DATE TIME NOV. DEC. JAN. MAR. 15 1037 06 1209 18 1115 14 1438 APR. 04 1036 STREAMFLOW, INSTANTANEOUS (CFS) 32.2 13.8 7.73 4.67 2.56 SPECIFIC CON- DUCTANCE (UMHOS) 375 375 375 333 350 TEMPERA- TORE (DEC C) 24.5 26.0 26.0 29.5 27.0 DATE TIME MAY 07 1333 JUNE 05 JULY 11 -- SEPT 06 -- STREAMFLOW, INSTANTANEOUS (CFS) 6.94 SPECIFIC CON- TEMPERA- DUCTANCE TURE (UMHOS) (DEG C) 450 400 310 375 32.0 356 RIO GUAYANILLA BASIN 50124700 RIO GUAYANILLA AT CENTRAL RUFINA, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°00'40", long 66°46'49 M / at dirt road bridge, 0.7 mi (1.1 km) from mouth, 0.9 mi (1.4 km) east of Central Rufina and 0.9 mi (1.4 km) southeast of Guayanilla. DRAINAGE AREA.--22.8 mi 1 (59.1 km1 )- PERIOD OF RECORD.--Water years 1960-65, 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 04. .. NOV 29. .. JAN 1990 31. .. APR 17. .. JUN 06. .. AUG 09. . . DIS- CHARGE, SPE- INST. CIFIC CUBIC CON- PH TEMPER- TOR- FEET DUCT- (STAND- ATURE BID- TIME PER ANCE ARD WATER ITY SECOND (US/CM) UNITS) (DEG C) (NTU) 0935 53 391 8.00 23.0 120 0855 12 466 7.80 22.0 10 0925 1.4 714 7.40 24.0 2.1 0850 eO.5 863 7.60 26.5 1.6 0855 1.2 846 7.10 28.0 1.0 0840 1.7 618 7.60 27.5 6.0 HARD- OXYGEN, OXYGEN COLI- STREP- DIS- DEMAND, FORM, TOCOCCI SOLVED CHEM- FECAL, FECAL, OXYGEN, (PER- ICAL 0.7 KF AGAR DIS- CENT (HIGH UM-MF (COLS. SOLVED SATUR- LEVEL) (COLS./ PER (MG/L) ATION) (MG/L) 100 ML) 100 ML) 7.8 91 15 2700 2900 8.2 92 24 K670 K120 5.9 69 21 K10 K10 4.3 53 29 200 64 5.4 69 31 K120 240 5.3 67 36 K<100 K<100 ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SIUM, SODIUM, AD- TOTAL WH WAT DIS- DIS- DIS- SORP- SIUM, WAT WH SULFATE RIDE, DIS- TOT FET SULFIDB DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE OCT 1989 04. .. NOV 29. . . JAN 1990 31... APR 17. .. JUN 06. . . AUG 09. . . AS MG/L AS (MG/L (MG/L (MG/L RATIO CACO3) CACO3 AS CA) AS MG) AS NA) 160 0 45 12 13 0. __ __ 270 0 75 19 66 2 __ 210 0 59 16 37 1 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL RIDE, DIS- CONSTI- DIS- AT 105 (MG/L MG/L AS (MG/L (MG/L (MG/L AS K) CACO3 AS S) AS SO4 ) AS CL) 4 1.9 140 <0.5 32 13 170 230 7.0 220 <0.5 81 65 220 4.5 180 -- 58 42 NITRO- NITRO- NITRO- NITRO- NITRO- GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC OCT 04 NOV 29 JAN 31 APR 17 JUN 06 AUG 09 e K SOLVED (MG/L DIS- (TONS SUS- DATE (MG/L AS SOLVED PER PENDED AS F) SIO2) (MG/L) DAY) (MG/L) 1989 0.10 19 220 31.3 224 28 1990 4 0.20 31 471 -- 14 6 <0.10 23 347 1.61 28 = estimated = non- ideal count TOTAL TOTAL TOTAL TOTAL TOTAL (MG/L (MG/L (MG/L (MG/L (MG/L AS N) AS N) AS N) AS N) AS N) 1.18 0.02 1.2 0.04 0.26 1.09 0.01 1.1 0.03 0.47 2.27 0.13 2.4 1.2 0.50 8.25 0.35 8.6 0.34 0.76 1.69 0.41 2.1 0.45 0.95 3.28 0.02 3.3 0.08 0.52 RIO GOAYANILLA BASIN 50124700 RIO GUAYANILLA AT CENTRAL RUFINA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 19S0 357 DATE OCT 1989 04.. . NOV 29.. . JAN 1990 31. . . APR 17. .. JUN 06. .. AUG 09.. . DATE OCT 1989 04.. . NOV 29. . . JAN 1990 31.. . APR 17. .. JUN 06.. . AUG 09. .. NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.30 0.50 1.7 1.1 1.4 0.60 IRON, TOTAL RECOV- ERABLE (DG/L AS FE) 14000 -- -- 340 -- -- NITRO- GEN, TOTAL (MG/L NITRO- GEN, TOTAL (MG/L AS N) AS NO3) 1.5 1. 6 4.1 9.7 3.5 3.9 LEAD, TOTAL RECOV- ERABLE (DG/L AS PB) 10 -- -- 2 -- -- 6.6 7.1 18 43 15 17 MANGA- NESE, TOTAL RECOV- ERABLE (DG/L AS MN) 440 -- -- 240 -- -- PHOS- PHORUS TOTAL (MG/L AS P) 0.26 0.30 0.20 3.5 2.9 1.4 MERCURY TOTAL RECOV- ERABLE (DG/L AS HG) <0.10 -- -- <0.10 -- -- ARSENIC TOTAL (UG/L AS AS) <1 -- -- 2 -- "" SELE- NIUM, TOTAL (UG/L AS SE) <1 -- -- <1 -- -- BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 -- -- <100 -- " SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) <1 -- -- <1 -- -- BORON, TOTAL RECOV- ERABLE (UG/L AS B) <10 -- -- 180 -- " ZINC, TOTAL RECOV- ERABLE (DG/L AS ZN) 40 -- -- 20 -- -- CADM: TOTJ REC< ERA! (UG AS ( - - -. " CYAN! TOTJ (MG> AS ( <0 . -- -- <0 . ( - - PESTICIDE ANALYSES PCB, ALDRIN, DATE JUN 1990 06. .. DATE JUN 1990 06. .. TIME 0855 ENDRIN, TOTAL (UG/L) <0.010 TOTAL (UG/L) <0.1 ETHION, TOTAL (DG/L) <0.01 NAPH- THA- TOTAL (UG/L) <0.010 HEPTA- CHLOR, TOTAL (UG/L) <0.010 CHLOR- DANE, TOTAL (UG/L) <0.1 HEPTA- CHLOR EPOXIDE TOTAL (UG/L) <0.010 ODD, TOTAL (UG/L) <0.010 LINDANE TOTAL (DG/L) 0.030 DDE, TOTAL (UG/L) <0.010 MALA- THION, TOTAL (UG/L) <0.01 DOT, TOTAL (DG/L) <0.010 METH- OXY- CHLOR, TOTAL (DG/L) <0.01 DI AZINI TOT, (UG 0 MET] PAR THIi TOT (UG <0 LENES, PARA- POLY- PER- TOX- TOTAL THION, CHLOR. THANE APHENE, TRI- 2,4- DATE D, 2,4, 5-T TOTAL TOTAL TOTAL TOTAL THION TOTAL TOTAL (UG/L) (UG/L) JUN 1990 06. .. <0 (DG/L) (UG/L) (UG/L) (UG/L) (UG/L) 01 <0.10 <0.1 < 1 <0 01 <0. 01 <0 .01 UM .L IV- ILE L ID) <1 <1 :DE L.L L :N) no 10 >N, VL 'L) 06 IYL V- >N, iL 'L) 01 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) 19 -- -- 1 -- " PHENOLS TOTAL (UG/L) 3 -- -- <1 -- -- DI- ELDRIN TOTAL (UG/L) <0.010 METHYL TRI- THION, TOTAL (UG/L) <0.01 COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) <10 -- -- <10 -- " METHY- LENE BLUE ACTIVE SUB- STANCE (MG/L) 0.11 -- — 0.26 -- -- ENDO- SULFAN, TOTAL (UG/L) <0.010 MI REX, TOTAL (UG/L) <0.01 1, 4-DP SILVEX, TOTAL TOTAL (UG/L) (UG/L) <0 01 <0 01 358 RIO YAOCO BASIN 50125780 LACK) LOCCHETTI AT DAMSITE, PR LOCATION.--Lat 18°05'37 H , long 66°51'54" / Hydrologic Unit 21010004, at Antonio Lucchetti Dam on Rio Yauco, 3.9 mi (6.3 km) north of Yauco. DRAINAGE AREA.--17.4 mi' {45.1 kma ). ELEVATION RECORDS PERIOD OF RECORD.--December 1989 to September 1990. GAGE.--Hater-stage recorder. Datum of gage is mean sea level. REMARKS.--Lago Lucchetti was completed in 1952. The dam is on Rio Yauco and is a unit of the Southwestern Puerto Rico Project. It provides 16,500 acre-feet (20.3 hm3 ) of usable storage for power generation and irrigation. The dam is a concrete gravity structure with a total length of 591 ft (180 m), a maximum height of 178 ft (54 m), and a maximum width at the base of 150 ft (46 m) . An ungated, overflow type spillway with a clear length of 171 ft (52 m) and a crest elevation of 570 ft (174 m) , occupies the central portion of the dam. The spillway was designed for a maximum capacity of 62,800 ft'/s (1,778 m'/s) at a design head of 20 ft (6 m) . The dam is owned by Puerto Rico Electric Power Authority. Gage-height and precipitation satellite telemetry at station. EXTREMES OBSERVED FOR CURRENT PERIOD.--Maximum elevation, 561.07 ft (171.01 m), Jan. 20; minimum elevation, 532.35 ft (162.26 m), Aug. 31. Capacity Table (based on data from Puerto Rico Water Resources Authority) Elevation, in feet 530 532 540 Contents, in acre-feet 3,695 3, 975 5,165 Elevation, in feet 550 561 563 Contents, in acre-feet 7,020 9, 600 10,125 ELEVATION (FEET NGVD), WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 OBSERVATION AT 24:00 VALUES DAY 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN MAX MIN OCT NOV DEC 560.43 560.10 560.26 560.30 560.31 560.32 560.35 560.40 560.37 560.56 560.87 560.99 560.85 560.46 560.10 560.18 560.12 559.94 559.85 559.72 559.72 559.60 559.92 560.04 A A A A A A 560.61 560.61 560.64 560.85 560.64 560.42 560.80 560.72 560.64 560.56 561.02 560.93 560.92 560.91 561.04 560.89 560.76 560.98 560.86 560.83 560.82 560.86 560.90 560.81 560.70 560.68 FEB 560.74 560.68 560.63 560.34 560.23 560.21 560.19 560.19 560.16 560.14 560.13 558.98 557.81 557.68 557.56 557.44 557.32 557.18 557.07 556.96 556.73 556.56 556.32 556.10 555.87 A A A MAR A A A 555.50 554.51 554.40 554.38 554.24 554.06 554.03 554.30 554.26 553.42 A A A A A 550.62 549.61 551.23 551.93 552.30 552.86 552.82 APR 551.52 552.48 552.64 554.02 556.08 555.15 554.88 554.81 554.75 555.37 555.27 555.20 555.10 555.13 555.14 555.42 553.82 553.04 553.08 554.57 554.55 554.82 554.14 555.32 556.22 MAY 556.36 557.81 557.82 557.70 557.54 557.33 557.06 556.94 556.93 556.89 555.74 555.70 555.68 555.61 555.54 555.51 555.16 555.00 554.79 554.54 554 .35 553.90 553.84 552.96 552.90 JUN 550.60 550.61 550.62 549.63 548.54 A A A A A 546.89 546.12 543.82 543.90 544.86 A A A A A A A A A A 553.44 553.38 551.46 551.35 550.52 550.84 556.82 556.92 557.35 557.41 557.37 ___ 552.85 552.16 550.90 550.96 551.90 550.63 A 546.25 546.26 546.76 546.77 --- JUL 546.80 546.80 546.75 546.70 543.99 543.81 543.65 543.49 543.31 543.34 542.65 541.47 541.39 541.18 540.96 540.80 540.61 A A A A A A A A A A A A A A AUG A A 539.55 539.40 539.38 539.31 538.90 538.59 540.53 540.26 539.95 539.63 539.27 538.92 538.76 538.66 538.62 538.62 538.54 538.46 536.95 537.12 536.15 535.13 535.34 535.49 535.52 534.16 534.38 533.00 532.36 SEP 532.46 532.48 534.44 534.95 A A A A 536.62 536.94 537.36 537.42 537.06 537.36 537.60 537.46 537.55 537.59 537.28 538.12 538.41 538.92 539.66 538.69 538.98 539.54 542.31 543.54 542.88 544.02 554.95 557.41 551.52 554.94 557.82 550.63 A No gage-height record. RIO LOCO BASIN 50129700 RIO LOCO AT GUANICA, PR WATER-QUALITY RECORDS LOCATION.--Lat 17°58'33", long 66°54'52", 0.6 mi (1.0 km) northwest of Guanica and 1.2 mi Ensenada. DRAINAGE AREA.--Indeterminate. PERIOD OF RECORD.--Water years 1975 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 359 (1.9 km) northeast of DATE OCT 1989 06. .. NOV 29. .. JAN 1990 31. .. APR 17. .. JUN 06. . . AUG 09. .. TIME 1110 1010 1105 1025 1010 0940 DIS- CHARGE, INST. CUBIC FEET PER SECOND elOO NF NF NF NF NF SPE- CIFIC CON- DUCT- ANCE (US /CM) 270 4350 9600 11300 8100 11400 PH (STAND- ARD UNITS) 7.90 7.60 7.70 7.80 7.20 7.40 TEMPER- ATURE WATER (DEG C) 25.0 25.0 24.5 28.0 28.5 29.5 TUR- BID- ITY (NTU) 32 2.8 15 3.4 1.8 5.1 OXYGEN, DIS- SOLVED (MG/L) 7.0 5.8 5.5 3.4 2.6 1. 9 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 83 69 65 43 33 24 OXYGEt DEMANI CHEM- ICAL (HIGI LEVEL) (MG/L) <io 4 2 19 9 3 0 180 4 COLI- FORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) 390 570 2800 2600 270 2600 STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) 460 K130 420 360 370 2800 DATE OCT 1989 06. .. NOV 29. .. JAN 1990 31. .. APR 17. .. JUN 06. . . AUG 09. .. HARD- NESS TOTAL (MG/L AS HARD- NESS NONCARB WH WAT TOT FLD MG/L AS CALCIUM DIS- SOLVED (MG/L MAGNE- SIUM, DIS- SOLVED (MG/L SODIUM, DIS- SOLVED (MG/L SODIUM AD- SORP- TION RATIO POTAS- SIUM, DIS- SOLVED (MG/L ALKA- LINITY WAT WH TOT FET FIELD MG/L AS SULFIE TOTAI SULFATE E DIS- SOLVED (KG/I (MG/L CHLO- RIDE, DIS- SOLVED (MG/L CACO3) CACO3 AS CA) AS MG) AS NA) 120 0 25 15 11 1400 0 120 270 1900 1300 0 120 250 1800 AS K) 0.4 1.9 22 4.5 21 74 CACO3 100 230 210 270 220 190 AS S] AS SO4) AS CL) <0.5 12 10 <0.5 450 3400 350 3800 SOLIDS, RESIDUE DATE OCT 1989 06.. . NOV 29. . . JAN 1990 31. . . APR 17.. . JUN 06.. . AUG 09.. . FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.10 -- -- 0.90 -- 0.30 SILICA, DIS- SOLVED (MG/L AS SIO2) 23 -- -- 27 -- 24 SUM OF CONSTI - TUENTS, DIS- SOLVED (MG/L) 158 -- -- 6330 -- 6530 SOLIDS, DIS- SOLVED (TONS PER DAY) -- -- -- -- -- -- TOTAL AT 105 DEG. C, SUS- PENDED (MG/L) 39 18 40 28 7 13 NITRO- GEN, NITRATE TOTAL (MG/L AS N) 0.97 0.58 0.27 0.29 -- -- NITRO- GEN, NITRITE TOTAL (MG/L AS N) 0.03 0.12 0.03 <0.01 <0.01 0.02 NITRO- GEN, NO2+NO3 A TOTAL (MG/L AS N) 1.0 0.70 0.30 0.30 •cO.10 •cO.10 NITRO- GEN, MMONIA TOTAL (MG/L AS N) 0.03 0.15 0.07 0.08 0.06 0.16 NITRO- GEN, ORGANIC TOTAL (MG/L AS N) 0.57 0.45 0.73 0.32 -- 0.34 K = non-ideal count e = estimate NF = no-flow 360 RIO LOCO BASIN 50129700 RIO LOCO AT GUANICA, PR—Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 06... NOV 29.. . JAN 1990 31.. . APR 17.. . JUN 06. . . AUG 09. . . DATE OCT 1989 06. . . NOV 29.. . JAN 1990 31. . . APR 17.. . JUN 06.. . AUG 09. .. DATE JUN 1990 06.. . DATE JUN 1990 06.. . DATE JUN 1990 06. .. NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS N03) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) 0.60 1.6 7.1 0.08 <1 <100 <10 <1 8 <10 0.60 1.3 5.8 0.24 0.80 1.1 4.9 0.16 0.40 0.70 3.1 0.11 1 100 910 3 28 20 <0.20 -- -- 0.10 0.50 -- -- 0.40 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MM) AS HG) AS SB) AS AG) AS ZN) AS CN) (UG/L) (MG/L) 2500 3 80 <0.10 <1 <1 <10 <0.010 8 0.10 __ -_ 470 3 100 <0.10 <1 <1 20 <0.010 4 0.55 __ -- PESTICIDE ANALYSES CHLOR- DI- DI- ENDO- PCB, ALDRIN, DANE, ODD, DDE, DOT, AZINON, ELDRIN SULFAN, TIME TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) 1010 <0.1 <0.010 <0.1 <0.010 <0.010 <0.010 <0.01 <0.010 <0.010 HEPTA- METH- METHYL METHYL HEPTA- CHLOR MALA- OXY- PARA- TRI- ENDRIN, ETHION, CHLOR, EPOXIDE LINDANE THION, CHLOR, THION, THION, MI REX, TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) <0.010 <0.01 <0.010 <0.010 <0.010 <0.01 <0.01 <0.01 <0.01 <0.01 NAPH- THA- LENES, PARA- POLY- PER- TOX- TOTAL THION, CHLOR. THANE APHENE, TRI- 2,4-D, 2,4,5-T 2, 4-DP SILVEX, TOTAL TOTAL TOTAL TOTAL THION TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) <0.01 <0.10 <0.1 <1 <0.01 0.03 <0.01 <0.01 <0.01 l,A6U*01ur/T"i^J"e CIBO""•"-^-»~ L-MQP <SW*r»M4. „ > ,1380 EXPLANATION SURFACE-WATER STATION AND NUMBER i 297 QUALITY-OF-WATER STATION AND NUMBER 143 WELL AND WELL NUMBER 2 5 4HILE3 T -i—h—rj 2145 6 KILOMETERS CO 0> Figure 24.--Rio Guanajibo basin. 362 RIO GUANAJIBO BASIN 50133600 RIO GUANAJIBO NEAR SAN GERMAN, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°07'18", long 67°03'56", at bridge on Highway 347, 2.2 mi (3.5 km) northwest of San German. DRAINAGE AREA.--45.5 mi * (117.8 km») . PERIOD OF RECORD.--Water years 1979 to current year. WATER QUALITY DATA, WATER YEARS OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 06. .. NOV 30. . . FEB 1990 01. .. APR 18. .. JUN 06. .. AUG 10. . . DATE OCT 1989 06. . . NOV 30. .. FEB 1990 01. . . APR 18. .. JUN 06. .. AUG 10. .. DIS- CHARGE, INST. CUBIC FEET TIME PER SECOND 0955 200 1010 46 1045 11 1125 6.1 1140 556 1145 8.9 HARD- HARD- NESS NESS NONCARB TOTAL WH WAT (MG/L TOT FLD AS MG/L AS CAC03 ) CAC03 200 0 __ __ 270 0 __ 260 0 SPE- CIFIC CON- DUCT- ANCE (US /CM) 440 572 742 805 760 684 CALCIUM DIS- SOLVED (MG/L AS CA) 22 -- -- 34 -- 30 PH (STAND- ARD UNITS) 7.70 7.80 7.50 7.80 7.40 8.00 MAGNE- SIUM, DIS- TEMPER- ATURE WATER (DEG C) 25.5 23.0 22.0 26.5 27.5 27.5 TUR- BID- ITY (NTU) 2. 4. 4. 8. 2. 5. OXYGEN, DIS- SOLVED (MG/L) 9 7.4 0 7.1 5 7.8 4 4.2 5 6.0 6 5.6 SODIUM POTAS- SODIUM, DIS- SOLVED SOLVED (MG/L AS MG) 35 -- -- 46 -- 46 SOLIDS, FLUO- SILICA, SUM (MG/L AS NA) 11 -- -_ 51 -- 46 AD- SORP- SIUM, DIS- TION SOLVED RATIO (MG/L 0. -- -- 1 -- 1 AS K) 3 1.5 -- -- 3.8 -- 3.1 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 90 82 88 52 75 70 ALKA- LINITY WAT WH TOT FET FIELD MG/L AS CAC03 190 240 240 170 230 220 OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 14 <10 260 31 34 24 SULFIDE TOTAL (MG/L AS S) <0.5 -- -- <0.5 -- ~~ COLI- FORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) K910 260 K1100 K160 K1700 200 SULFATE DIS- SOLVED (MG/L AS S04) 19 -- -- 82 -- 59 STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) K180 K82 K91 K100 410 210 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 12 -- — 61 — 51 RESIDUE OF SOLIDS, TOTAL RIDE, DIS- CONSTI- DIS- AT 105 DIS- SOLVED TUENTS, SOLVED DEC. NITRO- NITRO- NITRO- NITRO- NITRO- GEN, GEN, GEN, GEN, GEN, C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- DATE (MG/L AS SOLVED AS F) SI02) (MG/L) OCT 06 NOV 30 FEB 01 APR 18 JUN 06 AUG 10 K = 1989 0.10 33 1990 0.20 34 0.20 34 non- ideal count - - - 249 - - 442 - 401 PER FENDED DAY) (MG/L) 134 -- -- 7.28 -_ 9.67 5 39 10 26 1 8 TOTAL TOTAL TOTAL TOTAL TOTAL (MG/L (MG/L (MG/L (MG/L (MG/L AS N) AS 0.47 0. 0.49 0. 0.76 0. 0.29 0. 1.59 0. 1.75 0. N) AS 03 0 01 0 24 1 01 0 21 1 15 1 N) AS .50 0. .50 0. .0 0. .30 0. .8 1. .9 0. N) AS 13 03 98 08 2 30 0 0 0 0 0 0 N) .67 .57 .42 .32 .30 .30 RIO GUANAJIBO BASIN 50133600 RIO GUANAJIBO NEAR SAN GERMAN, PR--Continued WATER QUALITY DATA, WATER YEARS OCTOBER 1989 TO SEPTEMBER 1990 363 DATE OCT 1989 06.. . NOV 30.. . FEB 1990 01.. . APR 18.. . JUN 06.. . AUG 10.. . DATE OCT 1989 06.. . NOV 30.. . FEB 1990 01.. . APR 18.. . OUN 06.. . AUG 10. .. NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.80 0.60 1.4 0.40 1.5 0.60 IRON, TOTAL RECOV- ERABLE (UG/L AS FE) 460 -- -- 890 -- -- NITRO- GEN, TOTAL (MG/L AS N) 1.3 1.1 2.4 0.70 3.3 2.5 LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) 4 -- -- 2 -- -- NITRO- GEN, TOTAL (MG/L AS NO3) 5.8 4.9 11 3.8 15 11 MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) 60 -- -- 110 -- -- PHOS- PHORUS ARSENIC TOTAL TOTAL (MG/L (UG/L AS P) AS AS) 0.16 <1 0.14 1.5 0.11 1 1.2 0.94 MERCURY TOTAL SELE- RECOV- NIUM, ERABLE TOTAL (DG/L (UG/L AS HG) AS SE) 0.20 <1 __ __ <0.10 <1 __ __ BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 -- -- <100 -- - - SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) <1 — -- <1 -- -- CHRO- BORON, CADMIUM MIOM, TOTAL TOTAL TOTAL RECOV- RECOV- RECOV- ERABLE ERABLE ERABLE (UG/L (UG/L (UG/L AS B) AS CD) AS CR) <10 1 10 __ __ 320 <1 9 __ .. ZINC, TOTAL RECOV- CYANIDE ERABLE TOTAL PHENOLS (UG/L (MG/L TOTAL AS ZN) AS CN) (UG/L) 10 <0.010 5 __ __ 20 <0.010 1 __ __ COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) 10 -- -- 10 -- "" METHY- LBNB BLUE ACTIVE SUB- STANCE (MG/L) 0.04 -- -- 0.09 -- — 364 RIO GUANAJIBO BASIN 50136400 RIO ROSARIO NEAR HORMIGUEROS, PR LOGATION.--Lat 18°09'36", long 67°05'08", Hydrologic Unit 21010003 at bridge on Highway 348, 0.5 mi (0.8 km) southwest of Rosario plaza. DRAINAGE AREA.--18.3 mi a (47.4 km a ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--October 1985 to current year. GAGE.--Water-stage recorder. Elevation of gage is 50.0 ft (15.2 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. Gage-height and precipitation satellite telemetry at station. AVERAGE DISCHARGE.--5 years (1986-90), 53.8 ft3/s (1.524 m3/s), 39.92 in/yr (1,014 mm/yr), 38,980 acre-ft/yr (48.1 hm3/yr) . EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 7,480 ftVs (212 m3 /s), Aug.24, 1988, gage height, 13.64 ft (4.16 m) from rating curve extended above 900 ft3 /s (25.5 mVs) on basis of step-backwater analysis; minimum discharge 8.6 ft3 /s (0.244 m3/s). Mar. 11, 1989. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,500 ft3 /s (42.5 mVs) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft3/s) (m3/s) (ft) (m) Date Time (ft 3/s) (m3/s) (ft) (m) Nov. 8 1515 1,910 54.1 8.59 2.618 Sept. 23 1645 *2,920 82.7 *9.92 3.024 Nov. 11 1630 1,640 46.4 8.10 2.469 Sept. 25 1830 1,750 49.6 8.31 2.533 June 7 1700 1,800 51.0 8.40 2.560 Minimum discharge, 9.3 ft3/s (0.263 m3/s), July 21,22. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES DAY OCT NOV DEC JAN FEE MAR APR MAY JUN JUL AUG SEP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC- FT CFSM IN. CAL YR WTR YR 115 146 113 94 84 118 131 206 144 104 87 94 102 91 132 103 112 106 179 187 140 177 143 106 92 108 106 135 247 130 168 4000 129 247 84 7930 7.05 8.13 1989 1990 133 106 107 178 216 153 121 254 168 157 335 172 122 103 99 96 111 95 83 79 75 73 67 65 62 60 57 53 49 49 --- 3498 117 335 49 6940 6.37 7.11 TOTAL 27035 TOTAL 18146 49 49 48 47 45 45 45 43 42 41 41 40 39 38 38 36 35 35 34 34 33 33 32 32 31 30 29 38 34 76 146 1338 43.2 146 29 2650 2.36 2.72 .1 MEAN .7 MEAN 70 132 77 41 34 31 29 27 26 25 25 24 27 35 26 24 24 23 23 23 22 22 22 22 22 22 22 22 22 21 20 985 31.8 132 20 1950 1.74 2.00 74.1 MAX 49.7 MAX 20 19 19 19 19 19 18 19 19 19 19 19 20 19 18 18 18 18 18 19 18 18 18 17 19 19 18 17 ___ ___ --- 520 18.6 20 17 1030 1.01 1.06 488 MIN 335 MIN 17 17 17 17 17 17 17 17 17 17 16 18 22 36 29 48 124 44 18 16 16 16 15 15 15 15 14 12 12 13 14 698 22.5 124 12 1380 1.23 1.42 9.2 AC- FT 9.7 AC-FT 13 13 15 12 12 12 12 12 12 12 12 11 11 11 12 13 12 53 54 37 19 15 14 13 45 48 20 16 14 13 --- 568 18.9 54 11 1130 1.03 1.15 53620 35990 13 14 12 12 11 11 19 21 17 17 13 31 25 16 34 37 19 15 14 13 12 12 12 12 11 11 11 11 11 11 11 489 15.8 37 11 970 .86 .99 CFSM 4.05 CFSM 2.72 10 11 11 11 12 11 172 61 25 22 21 14 13 48 301 59 30 23 20 18 16 26 27 19 17 15 14 14 13 13 --- 1067 35.6 301 10 2120 1.94 2.17 IN. IN. 13 13 12 32 26 15 14 42 25 14 13 15 12 12 13 13 12 11 11 10 9.7 10 131 84 42 27 21 18 17 16 14 717.7 23.2 131 9.7 1420 1.27 1.46 54.96 36.89 17 16 15 15 26 19 60 38 43 33 22 19 27 29 20 18 21 24 18 16 e!5 e!24 e42 30 100 62 31 106 80 46 33 1165 37.6 124 15 2310 2.05 2.37 60 76 84 70 88 91 68 47 115 78 102 82 59 143 138 94 61 49 92 101 88 64 258 159 202 138 168 138 90 98 --- 3101 103 258 47 6150 5.65 6.30 e Estimated RIO GDANAJIBO BASIN 50136400 RIO ROSARIO NEAR HORMIGOEROS, PR--Continued 365 WATER-QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS 1979 TO CURRENT YEAR. PERIOD OF DAILY RECORD.-- SUSPENDED-SEDIMENT DISCHARGE: OCTOBER 1985 TO SEPTEMBER 1986 INSTRUMENTATION.--US D-49 SEDIMENT SAMPLER SINCE OCTOBER 1985. AUTOMATIC SEDIMENT SAMPLER SINCE 1986 REMARKS.--sediment samples were collected by a local observer once daily during low flow and more than once daily during high flow events for concentration and particle size analyses. Sediment samples are collected periodically by survey staff. Automatic sediment sampler set to collect samples above 200 cfs. EXTREMES FOR PERIOD OF DAILY RECORD.-- SEDIMENT CONCENTRATIONS: Maximum daily mean, 8,150 mg/L October 7, 1985; Minimum daily mean, 1 mg/L January 28, 1990. SEDIMENT LOADS: Maximum daily, 74,700 tons (67,800 tonnes) October 7, 1985; Minimum daily, 0.05 ton (0.04 Tonne) several days. EXTREMES FOR CURRENT YEAR.-- SEDIMENT CONCENTRATIONS: Maximum daily mean, 1,440 mg/L June 7, 1990; Minimum daily mean, 1.0 mg/L January 28, 1990. SEDIMENT LOADS: Maximum daily, 3,920 tons (3,600 tonnes) September 24, 1990; Minimum daily 0.09 ton (0.08 tonne) few days. WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 05. .. NOV 29. . . FEE 1990 02. .. APR 19. . . JUN 08. . . AUG 10. . . TIME 0825 1140 1010 1045 1015 1015 DIS- CHARGE, INST. CUBIC FEET PER SECOND 86 50 20 30 48 31 SPE- CIFIC CON- DUCT- ANCE (US/CM) 262 281 281 184 194 190 PH (STAND- ARD UNITS) 7.90 8.40 8. 10 7. 90 7.60 8.10 TEMPER- ATURE WATER (DEC C) 22.5 22 .0 21.0 24.0 24.0 24.0 TUR- BID- ITY (NTU) 2.1 1.2 1.0 92 33 90 OXYGEN, DIS- SOLVED (MG/L) 8.4 10.8 10.0 4.8 8.1 93.0 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 96 123 111 57 96 93 OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 11 10 16 16 27 29 COLI- FORM, FECAL, 0.7 UM-MP (COLS./ 100 ML) K1500 K91 K70 K14000 K6300 K19000 STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) K13000 K150 K60 2000 33000 29000 HARD- NESS TOTAL (MG/L AS CACO3) CACO3 OCT 1989 05. . . NOV 29. .. FEE 1990 02. . . APR 19. .. JUN 08. .. AUG 10. . . K = non-ideal 120 -- -- 91 -- 84 count HARD- NESS NONCARB CALCIUM WH WAT TOT FLD DIS- SOLVED MG/L AS (MG/L 120 0 22 MAGNE- SIUM, SODIUM, DIS- DIS- SOLVED SOLVED (MG/L (MG/L AS CA) AS MG) AS NA) 15 15 13 17 10 7.2 9.6 6.3 SODIUM AD- SORP- TION RATIO ALKA- POTAS- LINITY SIUM, WAT WH DIS- SOLVED AS K) 0.3 1.6 0.4 2.0 0.3 1.1 SULFATE TOT FET SULFIDE DIS- FIELD TOTAL SOLVED (MG/L MG/L AS (MG/L CAC03 110 120 130 75 80 80 (MG/L <0.5 7.0 <0.5 8.0 6.0 CHLO- RIDE, DIS- SOLVED (MG/L AS S) AS SO4) AS CL) 8.3 8.0 8.0 366 RIO GUANAJIBO BASIN 50136400 RIO ROSARIO NEAR HORMIGUEROS, PR—Continued WATER QUALITY DATA, WATER YEARS OCTOBER 1989 TO SEPTEMBER 1990 SOLIDS, RESIDUE DATE OCT 1989 05. . . NOV 29.. . PEB 1990 02.. . APR 19.. . JUN 08.. . AUG 10. .. DATE OCT 1989 05. . . NOV 29. . . PEB 1990 02.. . APR 19. .. JUN 08. . . AUG 10. .. DATE OCT 1989 05. .. NOV 29.. . PEB 1990 02.. . APR 19. .. JUN 08. .. AUG 10.. . PLUO- RIDE, DIS- SOLVED (MG/L AS P) 0.10 -- -- <0.10 -- 0.20 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 1.0 0.30 <0.20 0.40 0.50 0.60 IRON, TOTAL RECOV- ERABLE (UG/L AS PE) 310 -- -- 8100 -- -- SILICA, DIS- SOLVED (MG/L AS SI02) 31 -- -- 21 -- 21 NITRO- GEN, TOTAL (MG/L AS N) 1.7 1.0 -- 1.5 1.7 1.4 LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) 3 -- -- 2 -- -- SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 158 -- -- 122 -- 118 NITRO- GEN, TOTAL (MG/L AS NO3) 7.5 4 .4 -- 6.6 7.5 6.2 MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) 20 -- -- 130 -- -- SOLIDS, DIS- SOLVED (TONS PER DAY) 36.8 -- -- 29.9 -- 9.99 PHOS- PHORUS TOTAL (MG/L AS P) 0.03 0.04 0.03 0.06 0.06 0.08 MERCURY TOTAL RECOV- ERABLE (UG/L AS HG) <0.10 -- -- <0.10 -- -- TOTAL AT 105 DEC. C, SUS- PENDED (MG/L) 20 10 18 80 37 210 ARSENIC TOTAL (UG/L AS AS) <1 __ -- <1 -- -- SELE- NIUM, TOTAL (UG/L AS SB) <1 -- -- <1 __ -- NITRO- GEN, NITRATE TOTAL (MG/L AS N) 0.69 0.69 -- 1.05 1.18 0.73 BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 __ -- 100 -- -- SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) <1 -- -- <1 __ -- NITRO- GEN, NITRITE TOTAL (MG/L AS N) 0.01 0.01 <0.01 0.05 0. 02 0.07 BORON, TOTAL RECOV- ERABLE (UG/L AS B) <10 __ -- 30 __ -- ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) 20 -- -- 10 __ -- NITRO- GEN, NO2+NO3 TOTAL (MG/L AS N) 0.70 0.70 0.50 1.10 1.20 0.80 CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 __ -- <1 -- -- CYANIDE TOTAL (MG/L AS CN) <0.010 -- -- <0.010 -- -- NITRO- GEN, AMMONIA TOTAL (MG/L AS N) 0.01 0.03 <0.01 0.09 0.04 0.15 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) 7 -- -- 12 -- PHENOLS TOTAL (UG/L) 3 -- -- 1 -- -- NITRO- GEN, ORGANIC TOTAL (MG/L AS N) 0.99 0.27 -- 0.31 0.46 0.45 COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) <10 -_ -- 20 -- -- METHY- LENE BLUE ACTIVE SUB- STANCE (MG/L) 0.01 -- -- 0.12 -_ -- 367 DAY 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 RIO GDANAJIBO BASIN 50136400 RIO ROSARIO NEAR HORMIGUEROS, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN MEAN CONCEN- SEDIMENT MEAN DISCHARGE TRATION DISCHARGE DISCHARGE (CPS) (MG/L) (TONS/DAY) (CFS) OCTOBER 115 146 113 94 84 118 131 206 144 104 87 94 102 91 132 103 112 106 179 187 140 177 143 106 92 108 106 135 247 130 168 258 451 114 65 15 238 303 643 20 5 5 89 49 12 298 26 97 19 564 463 166 427 120 31 11 146 89 307 967 228 509 86 241 36 17 3.5 167 195 909 8.7 1.4 1.2 31 15 3.1 256 7.8 40 5.9 925 582 73 445 52 10 2.6 72 32 249 1630 86 408 MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT TRATION DISCHARGE DISCHARGE TRATION DISCHARGE (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) NOVEMBER 133 106 107 178 216 153 121 254 168 157 335 172 122 103 99 96 111 95 83 79 75 73 67 65 62 60 57 53 49 49 ___ 169 28 93 560 612 59 10 1060 297 291 1270 137 28 15 13 9 96 28 7 5 5 5 5 5 5 5 4 4 4 4 ___ 73 8 35 843 696 28 3 2260 148 206 3190 71 9 4 3 2 49 7 1 1 1 .1 .3 .5 .3 .4 .3 .8 .7 .0 .0 .96 .91 .87 .83 .80 .69 .56 .53 .53 ___ DECEMBER 49 49 48 47 45 45 45 43 42 41 41 40 39 38 38 36 35 35 34 34 33 33 32 32 31 30 29 38 34 76 146 4 3 3 3 3 4 4 4 3 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 26 28 243 380 .52 .45 .38 .38 .42 .48 .48 .45 .33 .22 .22 .22 .21 .20 .19 .18 .18 .18 .18 .18 .18 .18 .17 .16 .16 .16 .16 5.0 3.0 200 345 TOTAL 4000 6591.2 7648.08 1338 560.22 368 RIO GUANAJIBO BASIN 50136400 RIO ROSARIO NEAR HORMIGUEROS, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) (CPS) (MG/L) (TONS/DAY) (CPS) (MG/L) (TONS/DAY) JANUARY 70 132 77 41 34 31 29 27 26 25 25 24 27 35 26 24 24 23 23 23 22 22 22 22 22 22 22 22 22 21 20 85 459 60 15 14 12 11 9 10 10 10 7 12 28 13 8 7 6 5 3 2 2 2 2 2 2 2 1 2 2 2 22 419 19 1.7 1.3 .99 .80 .65 .67 .67 .61 .48 1.8 3.1 .93 .55 .44 .40 .32 .22 .12 . 12 .12 .12 .12 . 12 .12 .09 .11 . 11 . 10 FEBRUARY 20 19 19 19 19 19 18 19 19 19 19 19 20 19 18 18 18 18 18 19 18 18 18 17 19 19 18 17 .-_ 2 2 2 2 2 2 3 4 5 5 6 7 6 4 4 4 4 4 4 5 4 3 3 3 3 4 5 5 _ -_ .10 .12 .10 .12 .12 .10 .15 .23 .26 .25 .31 .38 .31 .22 .20 .20 .20 .20 .23 .25 .19 .14 .14 .14 .16 .22 .25 .23 -__ .-_ ___ MARCH 17 17 17 17 17 17 17 17 17 17 16 18 22 36 29 48 124 44 18 16 16 16 15 15 15 15 14 12 12 13 14 5 7 9 7 5 4 3 3 3 3 3 3 10 46 18 92 1010 47 8 6 5 6 7 8 8 8 6 6 7 7 7 .25 .32 .41 .34 .22 .18 .14 .13 .13 .13 .12 .15 .71 11 1.9 39 1540 10 .40 .28 .23 .24 .30 .32 .32 .32 .24 .19 .22 .25 .29 TOTAL 985 476.88 520 5.52 698 1608.73 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 RIO GUANAJIBO BASIN 50136400 RIO ROSARIO NEAR HORMIGOEROS, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 369 MEAN DISCHARGE (CFS) MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) APRIL 13 13 15 12 12 12 12 12 12 12 12 11 11 11 12 13 12 53 54 37 19 15 14 13 45 48 20 16 14 13 6 7 8 6 5 5 5 5 5 5 5 5 5 5 5 5 5 48 62 29 7 5 4 4 110 117 15 13 11 10 .20 .21 .27 .23 .15 .14 . 14 .14 .14 .14 .14 .14 . 14 .14 .16 . 18 .16 6.9 17 3. 9 .40 .22 . 16 .13 57 19 .85 .55 .40 .35 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) MAY 13 14 12 12 11 11 19 21 17 17 13 31 25 16 34 37 19 15 14 13 12 12 12 12 11 11 11 11 11 11 11 10 8 4 3 3 4 16 9 7 20 10 44 20 15 50 95 49 25 18 18 18 14 12 12 17 26 33 28 15 5 5 .34 .29 .16 .10 .09 .12 2.8 .65 .41 1.0 .36 14 1.6 .69 13 11 2.5 1.1 .69 .63 .59 .43 .38 .37 .51 .78 .97 .82 .43 .14 .16 MEAN DISCHARGE (CFS) MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) JUNE 10 11 11 11 12 11 172 61 25 22 21 14 13 48 301 59 30 23 20 18 16 26 27 19 17 15 14 14 13 13 6 6 4 5 11 10 1440 91 83 26 56 33 15 255 698 92 15 10 8 7 6 28 22 11 11 9 6 4 4 4 .17 .18 .13 .17 .36 .30 3220 21 6.3 2.0 3.5 1.3 .51 188 891 19 1.3 .62 .45 .33 .28 6.0 2.0 .61 .49 .36 .25 .16 .14 .14 TOTAL 568 109.68 489 57.11 1067 4367.05 370 RIO GUANAJIBO BASIN 50136400 RIO ROSARIO NEAR HORMIGUEROS, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN DISCHARGE DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 (CFS) 13 13 12 32 26 15 14 42 25 14 13 15 12 12 13 13 12 11 11 10 9. 10 131 84 42 27 21 18 17 16 14 TOTAL 717. YEAR e 18146. Estimated 7 7 7 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) JULY 4 4 5 51 71 40 25 104 99 78 70 48 20 16 14 15 15 14 12 12 12 12 1130 153 41 15 8 8 11 12 12 .14 .15 .16 16 5.8 1.8 .95 43 7.2 3.1 2.7 2.1 .63 .47 .49 .52 .48 .44 .36 .33 .32 .34 2260 55 4.3 1.2 .49 .40 .49 .48 .48 2410.32 35844.52 MEAN DISCHARGE (CPS) MEAN CONCEN- SEDIMENT MEAN TRATION DISCHARGE DISCHARGE (MG/L) (TONS/DAY) (CPS) AUGUST i 17 16 15 15 26 19 60 38 43 33 22 19 27 29 20 18 21 24 18 16 e!5 e!24 e42 30 100 62 31 106 80 46 33 11 5 4 5 18 8 158 91 78 22 9 6 17 16 7 6 11 20 14 11 elO e530 e44 18 360 93 34 391 177 46 21 2 88 10 22 2 1 1 1 1 e e610 elO 1 264 19 3 398 92 6 2 .52 .21 .18 .22 .6 .50 .3 .55 .34 .8 .4 .38 .29 .2 .5 .65 .48 .41 .7 .2 .4 .2 60 76 84 70 88 91 68 47 115 78 102 82 59 143 138 94 61 49 92 101 88 64 258 159 202 138 168 138 90 98 --- MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) SEPTEMBER 60 76 84 70 88 91 68 47 115 78 102 82 59 143 138 94 61 49 92 101 88 64 258 159 202 138 168 138 90 98 150 119 153 114 262 186 78 46 404 107 283 130 61 880 347 170 69 50 251 335 151 72 1220 456 870 356 640 334 142 300 61 30 51 24 209 76 17 6.6 448 25 204 32 10 1500 142 49 12 7.1 162 217 42 13 3920 217 1740 149 837 131 36 100 1542.03 3101 10467.7 371 RIO GDANAJIBO BASIN 50136400 RIO ROSARIO NEAR HORMIGUEROS, PR--Continued WATER QDALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT JTJN 1990 14. .. JUL 23. .. AUG 09. . . SEP 14. .. TIME 2345 1924 1900 1828 DIS- CHARGE, INST. CUBIC FEET PER SEDI- MENT, SUS- SED I- MENT, DIS- CHARGE, SUS- SED. SUSP. FALL DIAM. SED. SED. SUSP. SUSP. FALL FALL DIAM. DIAM. PERCENT PERCENT PERCENT FINER FINER FINER FENDED FENDED THAN THAN 362 2470 2410 994 12400 33300 270 4130 3000 480 12800 16600 15 17 24 14 23 29 42 24 THAN SECOND (MG/L) (T/DAY) .002 MM .004 MM .008 MM 36 42 61 33 JUN 1990 14. .. JUL 23. . . AUG 09. . . SEP 14. .. SED. SUSP. FALL DIAM. PERCENT FINER THAN 016 MM SED. SUSP. FALL DIAM. PERCENT FINER THAN .031 MM SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .062 MM SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .125 MM SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .250 MM SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .500 MM SED. SUSP. SIEVE DIAM. PERCENT FINER THAN 1.00 MM 49 53 77 46 65 68 86 60 80 88 98 88 93 96 99 97 98 100 100 99 98 100 100 100 100 100 100 100 SILT AND CLAY PERCENT OF SUSPENDED SEDIMENT DATE APR 1990 26. . . MAY 15. . . 16. . . JUN 07. .. 07. .. 08. . . 11. . . 14. .. 14. .. 15. . . JUL 04. .. SEP 14. .. 20. .. 23. . . 1210 0700 0700 1604 1704 0700 1030 0145 2230 1800 1800 1900 1800 1730 STREAM- FLOW, INSTAN- TANEOUS (CFS) SEDI- MENT, SUS- PENDED (MG/L) SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .062 MM 37 16 40 539 1680 60 22 719 214 156 16 699 302 1330 115 330 7000 10200 90 78 2420 1590 103 500 12000 3200 9520 5 36 10187 46267 15 5 4698 919 42 22 22647 2609 34186 88 94 99 82 84 97 90 90 77 97 89 86 94 86 372 RIO GUANAJIBO BASIN 50138000 RIO GUANAJIBO NEAR HORMIGUEROS, PR LOCATION.--Lat 18°08'36", long 67°08'57", Hydrologic Unit 21010003, at bridge on Highway 100, 1.4 mi (2.3 km) west of Hormigueroe, and 2.0 mi (3.2 km) downstream from Rio Rosario. DRAINAGE AREA.--120 mi» (311 km»). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--Annual low-flow measurements 1959, monthly measurements April 1959 to November 1967, January 1973 to current year. GAGE.--Water-stage recorder. Datum of gage is at mean sea level. Previous to Nov. 7, 1980, at site 0.3 mi (0.5 km) upstream at datum 7.36 ft (2.243 m) higher. REMARKS.--Records fair except those for estimated daily discharges, which are poor. Gage-height and precipitation satellite telemetry at station. AVERAGE DISCHARGE.--17 years (1974-90), 213 ftVs (6.032 m3/s), 24.10 in/yr (612 mm/yr), 154,300 acre-ft/yr (190 hmVyr); median of yearly mean discharges, 199 ftVs (5.64 mVs) , 144,000 acre-ft/yr (178 hmVyr) . EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 128,000 ftVs (3,620 m3 /s) , Sept. 16, 1975, gage height, 28.50 ft (8.687 m), site and datum then in use, from rating curve extended above 100 ft3 /s (2.832 m3 /s) on the basis of contracted-opening measurement of peak flow; minimum discharge, 4.6 ftVs (0.130 m3 /s) , June 22, 1977. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 2,000 ft3 /s (56.6 mVs) and maximum (*): Date Time Oct. 2 0600 Oct. 9 0020 Nov. 5 2220 Discharge (ft3/s) (m3/s) 2,300 2, 150 2,090 65.1 60.9 59.2 Gage (ft) 19.29 18.95 18.82 height (m) 5.880 5.776 5.736 Date Nov. 8 Nov . 12 June 15 Time 2340 0300 1200 Discharge (ft3 /s) (m3/s) 2,170 *2,300 2,230 61.4 65.1 63.2 Gage (ft) 18.99 *19.30 19.14 height (m) 5.788 5.883 5.834 Minimum discharge, 14 ft3 /s (0.396 m3 /s), June 1. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES DAY NOV JAN FEB MAR MAY JUN JUL AUG SEP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC -FT CFSM IN. CAL YR WTR YR 932 1790 827 545 441 531 515 905 1340 567 550 611 980 764 503 698 533 392 650 823 654 802 780 530 383 327 373 374 669 402 403 20594 664 1790 327 40850 5.54 6.38 1989 1990 510 347 305 618 1400 993 604 942 920 579 896 1350 504 379 e590 e540 e310 284 243 231 214 201 188 177 172 171 163 156 150 146 --- 14283 476 1400 146 28330 3.97 4.43 TOTAL 101293 TOTAL 62351 143 138 133 129 125 124 123 118 115 113 111 108 106 103 99 97 95 92 91 90 87 87 84 83 80 78 77 76 116 159 214 3394 109 214 76 6730 .91 1.05 MEAN MEAN 186 292 185 111 92 84 80 75 73 71 70 69 67 112 80 70 68 62 60 56 57 54 51 51 61 50 46 45 43 42 40 2503 80.7 292 40 4960 .67 .78 278 MAX 171 MAX 39 39 37 36 35 36 36 36 37 35 33 35 35 33 31 29 28 28 28 28 26 26 25 24 25 37 34 28 ___ ___ --- 899 32.1 39 24 1780 .27 .28 1800 MIN 12 1790 MIN 17 27 25 24 25 24 23 23 22 21 21 22 22 26 66 95 45 172 160 60 48 42 38 36 39 39 37 41 37 33 32 31 1356 43.7 172 21 2690 .36 .42 AC -FT AC -FT 29 26 29 26 26 23 25 23 23 23 33 24 22 20 22 22 23 55 102 109 48 32 26 23 144 227 128 60 43 36 --- 1452 48.4 227 20 2880 .40 .45 200900 123700 34 52 44 33 30 26 24 60 55 39 34 38 55 38 49 139 69 48 40 35 32 30 27 24 23 22 21 19 18 17 17 1192 38.5 139 17 2360 .32 .37 CFSM 2.31 CFSM 1.42 17 20 17 20 21 18 134 117 54 34 38 27 24 54 1740 310 161 122 103 90 83 78 97 86 73 69 65 61 59 57 --- 3849 128 1740 17 7630 1.07 1.19 IN. 31. IN. 19. 54 51 47 44 69 48 41 42 65 38 34 34 31 31 32 35 38 44 33 31 29 29 96 183 74 56 49 41 37 34 33 1503 48.5 183 29 2980 .40 .47 40 33 42 55 39 34 57 64 49 79 43 63 42 40 39 55 42 38 38 49 38 36 37 159 97 69 114 141 83 120 261 178 99 2300 74.2 261 34 4560 .62 .71 107 175 342 278 155 310 289 145 180 183 177 224 175 256 339 241 178 161 177 301 268 233 544 833 450 465 361 580 346 553 --- 9026 301 833 107 17900 2.51 2.80 Estimated RIO GUANAJIBO BASIN 50138000 RIO GUANAJIBO NEAR HORMIGUEROS, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORD.—Water years 1958 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 373 DATE DIS- CHARGE INST. CUBIC FEET TIME PER SPE- CIFIC CON- DUCT- ANCE SECOND (US /CM) OCT 1989 06. . . NOV 30. .. FEB 1990 01. .. APR 18. .. JUN 07. .. AUG 10. .. 0835 374 0840 145 0910 40 0915 22 0955 17 0750 69 HARD- HARD- NESS 357 452 471 495 466 333 NESS NONCARB CALCIUM TOTAL WH WAT DIS- (MG/L TOT FLD SOLVED DATE OCT 1989 06. .. NOV 30. . . FEB 1990 01. . . APR 18. . . JUN 07. . . AUG 10. . . AS MG/L AS (MG/L CACO3 ) CACO3 170 0 __ __ 210 0 __ 150 0 AS CA) 27 -- -- 32 -- 26 PH (STAND- ARD UNITS) 7.60 7.60 7.80 7.90 7.60 8.10 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 24 -- -- 31 -- 21 SOLIDS, FLUO- SILICA, SUM OCT 06 NOV 30 FBB 01 APR 18 JUN 07 AUG 10 K = RIDE, DIS- SOLVED DATE (MG/L AS F) 1989 0.10 1990 <0.10 <0.10 non- ideal count TEMPER- ATURE WATER (DBG C) 25.5 23.0 21.5 24.5 26.5 24.5 TUR- BID- ITY (NTU) 13 21 27 OXYGEN, DIS- SOLVED (MG/L) 7.2 7.0 7.7 2.1 6.1 8.7 10 7.5 7.1 SODIUM POTAS- SODIUM, DIS- SOLVED (MG/L AS NA) 11 -- -- 20 -- 12 AD- SORP- SIUM, DIS- TION SOLVED RATIO (MG/L 0. -- -- 0. -- 0. AS K) 4 2.6 -- -- 6 1.9 -- 4 1.9 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 87 81 77 73 91 84 ALKA- LINITY WAT WH TOT FET FIELD MG/L AS CAC03 160 200 200 200 190 140 OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 12 10 16 18 27 23 SULFIDE TOTAL (MG/L AS S) <0.5 -- -- <0.5 -- " COLI- FORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) 2000 260 K150 240 370 K6900 SULFATE DIS- SOLVED (MG/L AS S04) 14 -- -- 19 -- 12 STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) 3700 450 K1500 730 610 4700 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 11 -- -- 22 -- 14 RESIDUE OF SOLIDS, TOTAL DIS- CONSTI- DIS- AT 105 SOLVED TUENTS, SOLVED DBG. NITRO- NITRO- NITRO- NITRO- NITRO- GEN, GEN, GEN, GEN, GEN, C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC (MG/L DIS- (TONS SUS- AS SOLVED SIO2) (MG/L) 29 __ __ 32 __ 28 PER PBNDBD DAY) (MG/L) 215 217 - - 274 - 199 -- -- 16.3 -- 37.2 24 51 9 13 15 7 TOTAL TOTAL TOTAL TOTAL TOTAL (MG/L (MG/L (MG/L (MG/L (MG/L AS N) AS 0.47 0.73 0.69 0.39 0.38 0.57 0, 0. 0, 0, 0, 0, N) AS ,03 0 .07 0 ,01 0 ,01 0 ,02 0 .03 0 N) AS .50 0 .80 0 .70 0 .40 0 .40 0 .60 0 N) AS .06 .05 .02 .02 .05 .07 N) 0.64 0.35 0.48 -- 0.25 0.23 374 RIO GOANAJIBO BASIN 50138000 RIO GOANAJIBO NEAR HORMIGUEROS, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 06.. . NOV 30.. . FBB 1990 01.. . APR 18.. . JUN 07. .. AUG 10. .. DATE OCT 1989 06. .. NOV 30. . . FBB 1990 01. . . APR 18.. . JUN 07. .. AOG 10. .. NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.70 0.40 0.50 <0.20 0.30 0.30 IRON, TOTAL RECOV- ERABLE (UG/L AS FB) 1700 -- -- 340 -- -- NITRO- GEN, TOTAL (MG/L AS N) 1.2 1.2 1.2 -- 0.70 0.90 LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) 8 -- -- 3 -- -- NITRO- GEN, TOTAL (MG/L AS N03) 5.3 5.3 5.3 -- 3.1 4.0 MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) 130 -- -- 40 -- -- PHOS- PHORUS ARSENIC TOTAL TOTAL (MG/L (UG/L AS P) AS AS) 0.15 <1 0.17 0.33 0.30 <1 0.31 0.18 MERCURY TOTAL SBLB- RECOV- NIDM, BRABLE TOTAL (UG/L (DG/L AS HG) AS SB) 0.40 <1 __ ._ 0.20 <1 __ __ BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 -- -- <100 -- -- SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) <1 -- -- <1 -- -- CHRO- BORON, CADMIUM MIUM, TOTAL TOTAL TOTAL RECOV- RECOV- RECOV- ERABLE ERABLE ERABLB (DG/L (UG/L (OG/L AS B) AS CD) AS CR) 30 <1 10 __ -- 90 <1 3 __ .. ZINC, TOTAL RECOV- CYANIDE BRABLB TOTAL PHENOLS (UG/L (MG/L TOTAL AS ZN) AS CN) (UG/L) 20 <0.010 3 .- __ <10 <0.010 3 -_ _. COPPER, TOTAL RECOV- ERABLE (OG/L AS CO) 30 -- -- <10 -- "" METHY- LENE BLUB ACTIVE SUB- STANCE (MG/L) 0.05 -- -- 0.04 -- -- PESTICIDE ANALYSES DATE JUN 1990 07.. . 0955 PCB, TOTAL (UG/L) ALDRIN, TOTAL (UG/L) CHLOR- DANE, TOTAL (DG/L) ODD, TOTAL (UG/L) DDE, TOTAL (UG/L) DOT, TOTAL (UG/L) <0.010 <0.010 <0.010 DI- AZINON, TOTAL (UG/L) DI- BLDRIN TOTAL (DG/L) ENDO- SDLFAN, TOTAL (DG/L) 0.01 <0.010 <0.010 DATE JUN 1990 07.. . ENDRIN, TOTAL (UG/L) <0. 010 ETHION, TOTAL (UG/L) <0.01 HEPTA- CHLOR, TOTAL (UG/L) <0.010 HEPTA- CHLOR EPOXIDE TOTAL (UG/L) <0.010 LINDANE TOTAL (UG/L) <0.010 MALA- THION, TOTAL (UG/L) <0.01 METH- OXY- CHLOR, TOTAL (UG/L) <0.01 METHYL PARA- THION, TOTAL (UG/L) <0.01 METHYL TRI- THION, TOTAL (OG/L) <0.01 MI REX, TOTAL (OG/L) <0.01 DATE JUN 1990 07.. . PARA- THION, TOTAL (DG/L) <0.01 NAPH- THA- LENES, POLY- CHLOR. TOTAL (UG/L) <0. 10 PER- THANE TOTAL (UG/L) <0. 1 TOX- APHENE, TOTAL (UG/L) <1 TOTAL TRI- THION (UG/L) <0.01 2,4-D, TOTAL (DG/L) 0.44 2,4, 5-T TOTAL (UG/L) <0.01 2, 4-DP TOTAL (OG/L) <0.01 SILVEX, TOTAL (DG/L) <0.01 LARES EXPLANATION ^1440 SURFACE-WATER STATION AND NUMBER W QUALfTY-OF-WATER STATION AND NUMBER "1388 •11415 LAKE-ELEVATION STATION basin \Jslond divide Map area- 3 4MILES i—r~""~i—i—T~ 2 J 4 5 6 KILOMETERS CO N cn Figure 25.--Rio Yagiiez and Rio Grande de Anasco basins 376 RIO YAGUEZ BASIN 50138800 RIO YAGUEZ NEAR MAYAGUEZ, PR WATER-QUALITY RECORDS LOCATION.—Lat 18°12'31" / long 67°07'07", at steel-truss bridge on unnumbered paved road about 800 ft (244 m) south of Highway 106, 1.8 mi (2.9 km) west of Highways 106 and 352 junction, and 1.4 mi (2.3 km) east-northeast from MayagQez plaza. DRAINAGE AREA.--6.7 mi a (17.3 kma ). PERIOD OF RECORD.--Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 05. .. NOV 30. .. FEE 1990 01. . . APR 18. .. JUN 07. .. AUG 09. .. TIME 1125 0650 0705 0705 0730 1145 DIS- CHARGE, INST. CUBIC FEET PER SECOND 21 11 3.3 1.9 1.8 3.9 SPE- CIFIC CON- DUCT- ANCE (US/CM) 282 300 333 357 328 289 PH (STAND- ARD UNITS) 7.90 7.70 7.70 7.80 7.40 8.20 TEMPER- ATURE WATER (DEC C) 24.0 20.5 19.5 22.5 23.0 26.0 TUR- BID- ITY (NTU) 4.5 1.3 1.0 2.0 1.5 9.3 OXYGEN, DIS- SOLVED (MG/L) 8.0 8.0 7.9 7.7 7.2 8.5 OXYGEN, OXYGEN DIS- DEMAND, SOLVED CHEM- (PER- ICAL CENT (HIGH SATUR- LEVEL) ATION) (MG/L) 94 <10 88 <10 85 <10 88 <10 82 19 104 22 COLI- FORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) 480 340 240 260 450 K1200 STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) 840 740 K2100 930 2300 K1600 OCT 1989 05. .. NOV 30. . . FEE 1990 01. .. APR 18. .. JUN 07. .. AUG 09.. . HARD- HARD- NESS MAGNE- NESS NONCARB CALCIUM SIUM, SODIUM, TOTAL WH WAT DIS- DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED AS MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 120 180 160 AS CA) AS MG) AS NA) 33 10 40 20 34 18 12 83 87 SODIUM AD- SORP- TION RATIO POTAS- SIUM, DIS- SOLVED ALKA- LINITY WAT WH TOT FET FIELD SULFIDB TOTAL SULFATB DIS- SOLVED (MG/L MG/L AS AS K) 0.5 2.1 3 5.0 3 6.4 (MG/L (MG/L CACO3 120 140 150 150 150 130 CHLO- RIDE, DIS- SOLVED (MG/L AS S) AS S04) AS CL) <0.5 6.0 8.6 <0.5 11 33 9.6 26 SOLIDS, DATE OCT 1989 05. . . NOV 30.. . FEE 1990 01.. . APR 18. .. JUN 07.. . AUG 09. .. FLUO- RIDB, DIS- SOLVED (MG/L AS F) 0.10 -- -- 0.10 -- <0.10 SILICA, DIS- SOLVED (MG/L AS SI02) 31 -- -- 31 -- 29 SUM OF CONSTI- TUENTS , DIS- SOLVED (MG/L) 178 -- -- 312 -- 286 SOLIDS, DIS- SOLVED (TONS PER DAY) 10.1 -- -- 1.60 -- 3.07 TOTAL AT 105 DEG. C, SUS- PENDED (MG/L) <1 14 6 10 3 8 NITRO- GEN, NITRATE TOTAL (MG/L AS N) 0.89 0.99 — 0.49 -- 0.59 NITRO- GEN, NITRITE TOTAL (MG/L AS N) 0.01 0.01 <0.01 0.01 <0.01 <0.01 NITRO- GEN, N02+N03 TOTAL (MG/L AS N) 0.90 1.0 0.70 0.50 0.50 0.60 NITRO- GEN, AMMONIA TOTAL (MG/L AS N) 0.02 0.03 0.01 0.02 0.02 0.04 NITRO- GEN, ORGANIC TOTAL (MG/L AS N) 0.28 0.47 -- 0.48 — 0.16 K = non-ideal count RIO YAGUEZ BASIN 50138800 RIO YAGOEZ NEAR MAYAGUEZ, PR—Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 377 DATE OCT 1989 05. . . NOV 30. .. FEB 1990 01. . . APR 18. .. JUN 07 ... AUG 09.. . DATE OCT 1989 05.. . NOV 30. . . FEB 1990 01.. . APR 18. .. JUN 07. .. AUG 09.. . NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.30 0.50 <0.20 0.50 <0.20 0.20 IRON, TOTAL RECOV- ERABLE (UG/L AS FE) 420 -- -- 160 -- -- NITRO- NITRO- GEN, GEN, TOTAL TOTAL (MG/L (MG/L AS N) AS NO3) 1.2 5.3 1.5 6.6 ._ 1.0 4.4 __ 0.80 3.5 MANGA- LEAD, NESE, TOTAL TOTAL RECOV- RECOV- ERABLE ERABLE (UG/L (UG/L AS PB) AS MN) 7 10 __ __ 2 20 __ __ BARIUM, PHOS- TOTAL PHORUS ARSENIC RECOV- TOTAL TOTAL ERABLE (MG/L (UG/L (UG/L AS P) AS AS) AS BA) 0.05 <1 <100 0.05 0.10 0.04 <1 100 0.04 0.07 MERCURY SILVER, TOTAL SELE- TOTAL RECOV- NIUM, RECOV- ERABLE TOTAL ERABLE (UG/L (UG/L (UG/L AS HG) AS SB) AS AG) <0.10 <1 <1 _. __ 0.10 <1 <1 __ __ CHRO- BORON, CADMIUM MIUM, COPPER, TOTAL TOTAL TOTAL TOTAL RECOV- RECOV- RECOV- RECOV- ERABLE ERABLE ERABLE ERABLE (UG/L (UG/L (UG/L (UG/L AS B) AS CD) AS CR) AS CU) <10 <1 <1 10 __ _. 40 <1 <1 10 __ __ __ __ __ METHY- ZINC, LENE TOTAL BLUE RECOV- CYANIDE ACTIVE ERABLE TOTAL PHENOLS SUB- (UG/L (MG/L TOTAL STANCE AS ZN) AS CN) (UG/L) (MG/L) <10 <0.010 5 0.03 __ __ <10 <0.010 3 0.05 __ __ 378 RIO GRANDE DE ANASCO BASIN 50141500 LAGO GUAYO NEAR CASTANER, PR LOCATION.--Lat 18°12'46", long 66°50'06", Hydrologic Unit 21010003, at Guayo Dam on Rio Guayo, 1.1 mi (1.8 km) southwest of Lago Yahuecas, 2.6 mi (4.2 km) southwest of Lago Prieto, 2.1 mi (3.4 km) north of Castaner, and 6.0 mi (9.6 km) west of Adjuntas. DRAINAGE AREA.--9.60 mi j (24.86 km 2 ). ELEVATION RECORDS PERIOD OF RECORD.--April 1980 to January 1985, June 1989 to current year. GAGE.--Hater-stage recorder. Datum of gage is mean sea level. REMARKS.--Lago Guayo was completed in 1956. The dam is on Rio Guayo and is the largest in the southwestern Puerto Rico project. The maximum storage is 17,400 ac-ft (21.5 hm3 ) for power and irrigation. The dam is a concrete gravity structure with a total length of 555 ft (169 m), a maximum structural height of 190 ft (58 m), and a maximum width at the base of 145 ft (44 m) . The ungated overflow spillway with a crest elevation of 60.00 ft (18.29 m) and a crest length of 220 ft (67 m) was designed to pass a maximum flood of 30,200 ftVs (855 m3/s) at a reservoir elevation of 70.00 ft (21.34 m) . Timber flashboards that were added to increase storage capacity were subsequently removed and their use discontinued. Gage-height and precipitation satellite telemetry at station. EXTREMES OBSERVED FOR PERIOD OF RECORD.--Maximum elevation, 1462.43 ft (445.75 m), May 27, 1980; minimum elevation recorded, 1415.43 ft (431.42 m), June 2, 1990, but may have been less during period of no gage-height record June 2-5, 1990. EXTREMES OBSERVED FOR CURRENT YEAR.--Maximum elevation, 1460.63 ft (445.20 m), Oct. 2; minimum elevation recorded 1415.43 ft (431.42 m), June 2, but may have been less during period of no gage-height record June 2-5. Capacity Table (based on data from Puerto Rico Hater Resources Authority) Elevation, in feet 1415 1449 Contents, in acre-feet 3,960 10,660 Elevation, in feet 1460 1465 Contents, in acre-feet 13,550 15,000 ELEVATION (FEET NGVD), HATER YEAR OCTOBER 1989 TO SEPTEMBER 199' OBSERVATION AT 24:00 VALUES JUN JUL SEP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN MAX MIN 1460. 1460. 1460. 1459. 1459. 1458. 1457. 1457. 1456. 1455. 1454. 1453. 1452. 1451. 1450. 1450. 1450. 1451. 1451. 1452. 1454. 1456. 1458. 1457. 1456. 1454. 1453. 1453. 1455. 1456. 1455. 1455. 1460. 1450. 39 61 44 98 12 20 05 33 45 14 00 18 52 51 43 09 77 70 87 36 54 81 05 25 10 84 74 85 86 55 59 36 61 09 1454 1453 1451 1450 1449 1447 1446 1445 1445 1445 1446 1447 1447 1448 1447 1447 1448 1448 1448 1448 1448 1449 1449 1449 1449 1450 1450 1450 1450 1450 1448 1454 1445 .66 .33 .93 .47 .15 .80 .93 .99 .19 .08 .17 .04 .68 .18 .16 .81 .38 .14 .80 .29 .93 .53 .72 .74 .74 .27 .04 .53 .43 .29 .91 .66 .08 1450. 1451. 1451. 1450. 1448. 1448. 1446. 1445. 1444. 1445. 1444. 1444. 1444. 1443. 1443. 1442. 1442. 1440. 1441. 1441. 1440. 1440. 1440. 1440. 1440. 1440. 1440. 1440. 1440. 1440. 1440. 1443. 1451. 1440. 75 05 19 00 98 18 60 15 96 39 67 39 00 72 49 25 18 96 10 06 26 34 54 84 93 24 33 51 33 44 81 73 19 24 1441 1441 1441 1442 1442 1441 1442 1442 1441 1440 1439 1438 1438 1438 1438 1437 1437 1438 1438 1438 1438 1438 1437 1438 1438 1438 1438 1439 1437 1438 1438 1439 1442 1437 .14 .45 .89 .20 .11 .92 .20 .37 .68 .50 .73 .24 .54 .93 .92 .68 .92 .19 .47 .04 .25 .52 .91 .14 .39 .67 .86 .00 .82 .00 .23 .48 .37 .68 1438 1438 1438 1438 1438 1439 1439 1439 1440 1440 1441 1441 1441 1441 1442 1442 1441 1441 1440 1439 1439 1439 1439 1439 1439 .32 .53 .44 .62 .84 . 04 .25 A A A .88 .58 .78 .15 .38 .61 .80 .01 .22 .66 . 19 .90 .48 .47 .46 .66 .86 .92 ___ ___ --- ___ ___ ___ 1439 1440 1440 1440 1440 1440 1440 1440 1440 1440 1440 1440 1440 1440 1440 1439 1439 1438 1437 1437 1437 1437 1437 1437 1437 1436 .98 .17 .10 .17 .36 .40 .65 A A A A A .16 .34 .49 .60 .62 .64 .68 .71 .79 .32 .53 .66 .78 .38 .20 .17 .30 .28 .52 ___ ___ ___ 1436.06 1435.18 1435.14 1433.95 1431. 99 1431.96 A A A A A A A A A A A A A A A A A A 1430. 11 A A A 1428.96 A --- ___ ___ ___ 1423 1423 1423 1423 1422 1422 1422 1422 1422 1422 1422 1421 1422 1420 1420 1420 1420 1420 1419 1419 1419 1419 1420 1420 1419 1418 1417 1417 A A A .53 .51 .10 .36 .39 .42 .57 .69 .73 .80 .84 .88 .00 .52 .60 .68 .77 .86 .76 .78 .84 .92 .00 .02 .36 .74 .46 .45 ___ ___ ___ 1415 14 1415 1416 1416 1416 1416 1416 1416 1416 1416 1416 1420 1421 1421 1422 1421 1421 1422 1423 1424 1424 1424 1423 1423 1423 1423 .60 A A * <9 . 95 .04 .04 .05 .05 .06 .06 .18 .04 .06 .82 .45 .88 .14 .37 .58 .60 .47 .12 .51 .15 .56 .78 .16 .21 ___ ___ ___ 1423 1423 1423 1423 1423 1423 1423 1423 1423 1423 1423 1423 1423 1423 1423 1423 1423 1423 1423 1421 1421 1421 1422 1423 1423 1423 1423 1423 1423 1423 1424 1423 1424 1421 .23 .37 .40 .54 .58 .59 .74 .86 .93 .58 .12 .13 .20 .22 .23 .37 .48 .47 .21 .80 .83 .88 .59 .35 .53 .56 .74 .83 .90 .94 .01 .33 .01 .80 1424. 1424. 1424. 1424. 1424. 1424. 1424. 1424. 1425. 1425. 1425. 1425. 1425. 1425. 1425. 1425. 1425. 1426. 1426. 1426. 1427. 1428. 1428. 1428. 1431. 1431. 1431. 1432.. 1432. 1433. 1433. 1427. 1433. 1424. 05 12 17 28 46 53 64 73 04 16 27 35 52 51 59 66 98 33 50 63 25 24 70 92 07 65 87 51 87 14 64 21 64 05 1433.90 1434.24 1437.45 1438.96 1439.22 1441.87 1442.57 1442.85 1442.99 1444.18 1443.38 1442.88 1442.40 1441.86 1442.04 1442.37 1441.52 1440.59 1439.97 1439.92 1439.56 1440.31 1444.17 1445.77 1447.45 1447.90 1447.71 1447.57 1447.50 1448.39 1442.38 1448.39 1433.90 A No gage-height record. 379 RIO GRANDE DB ANASCO BASIN 50143000 RIO GRANDE DB ANASCO NEAR LARES, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°15'26", long 66°55'00", at bridge on Highway 124, 0.7 mi (1.1 km) downstream from confluence of Rio Blanco and Rio Prieto, and 3.7 mi (6.0 km) southwest of Lares plaza. DRAINAGE AREA.--26.3 mi 1 (68.1 km 2 ) this does not include 36.2 mi 2 (93.8 km 2 ) which contributes only dur- ing high floods, and 3.5 mi 2 (9.1 km 2 ) which contributes only part of its storm runoff. PERIOD OP RECORD.--Water years 1959-68, 1970 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 11. . . DEC 11. . . PBB 1990 07. . . MAY 03. .. JUN 25. . . AUG 16. . . TIME 1515 1030 1215 0920 1050 1240 DIS- CHARGE, INST. CUBIC FEET PER SECOND 107 35 15 8.5 11 25 SPE- CIFIC CON- DUCT- ANCE (US/CM) 272 201 204 313 293 271 PH (STAND- ARD UNITS) 8.00 7.80 8.40 8.20 8.30 8.40 TEMPER- ATURE WATER (DEC C) 26.5 22.0 22.0 24.5 28.5 27.5 TUR- BID- ITY (NTU) 3.4 1.1 9.8 1.5 3.0 5.0 OXYGEN, DIS- SOLVED (MG/L) 8.0 8.3 10.3 9.6 8.8 9.0 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 100 94 117 114 114 113 OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 27 12 12 <10 23 16 COLI- FORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) K<10 K910 K27 K30 350 K64 STREP- TOCOCCI FECAL, KF AGAR (COLS . PER 100 ML) K45 400 K10 K36 K60 K63 DATE OCT 1989 11. .. DEC 11. . . FBB 1990 07. . . MAY 03. .. JUN 25... AUG 16. . . HARD- NESS TOTAL (MG/L AS CAC03 ) HARD- NESS NONCARB WH WAT TOT FLD MG/L AS CACO3 CALCIUM DIS- SOLVED (MG/L AS CA) MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) SODIUM, DIS- SOLVED (MG/L AS NA) SODIUM AD- SORP- TION RATIO POTAS- SIUM, DIS- SOLVED (MG/L AS K) ALKA- LINITY WAT WH TOT PET FIELD MG/L AS CAC03 SULFIDE TOTAL (MG/L AS S) SULFATE DIS- SOLVED (MG/L AS SO4) CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 130 30 8.7 12 34 10 110 11 30 8.3 12 0.5 1.7 0.5 1.4 0.5 1.9 100 120 130 140 110 98 <0.5 17 <0.5 19 19 9.3 11 SOLIDS, RESIDUE DATE OCT 1989 11. . . DEC 11. . . FBB 1990 07.. . MAY 03.. . JUN 25. . . AUG 16.. . FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.10 -- -- 0.10 -- <0.10 SILICA, DIS- SOLVED (MG/L AS SI02) 34 -- -- 35 -- 27 SUM OF CONSTI - TUENTS , DIS- SOLVED (MG/L) 173 -- -- 196 -- 168 SOLIDS, DIS- SOLVED (TONS PER DAY) 49.9 -- -- 4.50 -- 11.6 TOTAL AT 105 DBG. C, SUS- PENDED (MG/L) <1 8 6 3 2 14 NITRO- NITRO- NITRO- GEN, GEN, GEN, NITRATE NITRITE NO2+NO3 TOTAL TOTAL TOTAL (MG/L (MG/L (MG/L AS N) AS N) 1.39 0.18 <0.01 0.01 <0.01 <0.01 0.02 <0.01 AS N) 1.80 1.40 0.70 <0.10 0.20 0.30 NITRO- GEN, AMMONIA TOTAL (MG/L AS N) 0.01 0.02 0.01 <0.01 0.02 <0.01 NITRO- GEN, ORGANIC TOTAL (MG/L AS N) -- 0.48 0.29 - 0.58 __ non-ideal count 380 RIO GRANDE DE ANASCO BASIN 50143000 RIO GRANDE DE ANASCO NEAR LARES, PR—Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 OCT 1989 11. .. DEC 11.. . FEB 1990 07. .. MAY 03. .. JUN 25. . . AUG 16. .. DATE OCT 1989 11.. . DEC 11.. . FEB 1990 07 ... MAY 03.. . JUN 25.. . AUG 16.. . NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) <0.20 0.50 0.30 0.30 0.60 0.30 IRON, TOTAL RECOV- ERABLE (UG/L AS FE) NITRO- GEN, TOTAL (MG/L AS N) -- 1.9 1.0 -- 0.80 0.60 LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) NITRO- GEN, TOTAL (MG/L AS N03) -- 8.4 4.4 -- 3.5 2.7 MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MM) PHOS- PHORUS TOTAL (MG/L AS P) 0.05 0.05 0.03 0.02 0.03 0.03 MERCURY TOTAL RECOV- ERABLE (UG/L AS HG) ARSENIC TOTAL (UG/L AS AS) <1 -- -- <1 -- -- SELE- NIUM, TOTAL (UG/L AS SE) BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 -- -- <100 -- -- SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) BORON, TOTAL RECOV- ERABLE (UG/L AS B) <10 -- -- 30 -- -- ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- <1 -- -- CYANIDE TOTAL (MG/L AS CN) CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) <1 -- -- <1 -- -- PHENOLS TOTAL (UG/L) COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) <10 -- -- <10 - -- METHY- LENE BLUE ACTIVE SUB- STANCE (MG/L) 390 150 20 <0. 10 <0.10 <0.010 <0.010 0.04 0.04 RIO GRANDB OB ANASCO BASIN 50144000 RIO GRANDB DB ANASCO NEAR SAN SEBASTIAN, PR 381 LOGATION.--Lat 18°17'05", long 67°03'05", Hydrologic Unit 21010003, on right bank, at downstream side of bridge on Highway 108, 0.4 mi (0.6 km) downstream from Quebrada La Zumbadora, 4.4 mi (7.1 km) northwest of Las Marias, 5.4 mi (8.7 km) southwest of San Sebastian. DRAINAGE AREA.--94.3 mi 1 (244.2 km1 ), does not include 36.2 mi 1 (93.8 km1 ) which contributes only during high floods, and 3.5 mi 1 (9.1 km1 ) which contributes only part of its storm runoff. WATER-DISCHARGE RECORDS PERIOD OF RECORD.--March 1963 to current year. GAGE.--Water-stage recorder. Datum of gage is 103.72 ft (31.614 m) above mean sea level (Puerto Rico Department of Public Works bench mark). Previous to Oct. 30, 1975, at site 600 ft (180 m) upstream at same datum. REMARKS.--Records fair except those for estimated daily discharges, which are poor. Transbasin diversion (except during floods) to Rio Yauco basin for hydroelectric power and irrigation above Lago Guayo, Yahuecas, and Prieto, combined useable storage 17,300 acre-ft (21.3 hm3 ) . Limited storm runoff is contributed to basin by 3.5 mi 1 (9.1 km1 ) above Rio Toro Diversion dam. Gage-height and precipitation satellite telemetry at station. AVERAGE DISCHARGE.--27 years (1964-90), 309 ftVs (8.751 m'/s) , 44.50 in/yr (1,130 mm/yr), 223,900 acre-ft/yr (276 hm'/yr); median of yearly mean discharges, 303 ft'/s (8.58 m'/s), 220,000 acre-ft/yr (271 hmVyr) . EXTREMES FOR PERIOD OP RECORD.--Maximum discharge, 140,000 ft'/s (3,960 m'/s), Sept. 16, 1975, gage height, 33.9 ft (10.33 m) , from rating curve extended above 4,000 ft'/s (113 mVs) on basis of slope-area measurement; minimum discharge, 31 ftVs (0.878 m'/s). Apr. 19, 20, 1965. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 6,000 ft'/s (170 m3 /s) and maximum (*): Discharge (ft 3 /s) (m'/s) Gage height (ft) (m) Date Time Oct. 15 1800 9,110 258 8.91 2.716 Minimum discharge, 43 ft 3 /s (1.218 mVs), May 7. Date Oct. 19 Time 1700 Discharge (ft'/s) (m'/s) •12,600 357 Gage height (ft) (m) *10.45 3.185 DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 OCT 989 1300 2030 e!030 914 650 578 1180 882 589 527 559 611 534 1400 1290 831 592 1610 752 1480 1250 861 779 586 573 571 749 1050 698 551 NOV 471 408 388 384 389 394 361 360 389 425 380 352 330 318 309 301 705 351 276 285 268 258 248 244 242 241 235 232 226 224 DEC 221 218 214 211 209 206 204 195 193 191 189 184 185 181 179 188 185 174 172 169 166 162 159 159 161 156 153 235 217 169 186 TOTAL MEAN MAX MIN AC-FT CFSM IN. 27996 903 2030 527 55530 9.58 11.04 9994 333 705 224 19820 3.53 3.94 5791 187 235 153 11490 1.98 2.28 CAL YR 1989 WTR YR 1990 TOTAL 130830 MEAN 358 TOTAL 94684 MEAN 259 JAN 223 185 219 167 152 146 142 137 135 135 132 132 128 197 142 125 122 118 117 117 115 111 110 109 108 110 105 106 102 100 98 4145 134 223 98 8220 1.42 1.64 MAX 2160 MAX 2030 PEB 96 96 95 95 94 92 93 99 95 94 93 97 105 102 105 88 85 84 92 112 86 85 84 80 76 78 78 76 2555 91.2 112 76 5070 .97 1.01 76 75 74 72 72 71 72 70 71 79 74 80 91 89 91 78 109 114 80 74 80 70 77 82 66 62 60 60 60 73 63 2365 76.3 114 60 4690 .81 .93 APR 60 64 93 71 59 56 60 59 53 50 50 49 46 48 51 50 48 47 105 200 85 59 49 45 57 290 110 76 64 59 2213 73.8 290 45 4390 .78 .87 MIN 62 MIN 44 AC-FT 259500 AC-FT 187800 MAY 55 56 53 48 46 44 46 206 224 143 117 77 51 51 45 90 80 67 62 64 64 55 52 52 52 50 57 62 58 69 85 2281 73.6 224 44 4520 .78 .90 CFSM 3.80 CFSM 2.75 JUN 68 72 67 77 126 209 94 143 122 72 e94 e60 e!20 e300 e!50 el30 e250 el80 e!40 e!20 ellO elOO e!20 el40 ellO 90 86 79 74 74 3577 119 300 60 7090 1.26 1.41 IN. 51.61 IN. 37.35 JUL 74 70 67 159 293 151 139 181 231 103 78 71 63 65 59 67 64 81 82 80 64 58 78 236 152 122 86 75 68 64 275 3456 111 293 58 6850 1.18 1.36 AUG 132 92 91 73 66 81 74 117 542 275 135 255 242 203 121 102 93 171 138 99 89 378 276 400 234 261 157 160 224 194 185 5660 183 542 66 11230 1.94 2.23 SEP 256 206 1240 799 827 1010 939 376 1250 1040 635 632 913 647 722 444 621 401 354 982 890 465 1770 1890 1470 1380 684 645 469 694 24651 822 1890 206 48900 8.71 9.72 e Estimated 382 RIO GRANDE DE ANASCO BASIN 50144000 RIO GRANDE DE ANASCO NEAR SAN SEBASTIAN, PR--Continued (National stream-quality accounting network station) WATER-QUALITY RECORDS PERIOD OF RECORD.--Water years 1963 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 13. .. JAN 1990 09. .. MAY 02. .. JUL 23. .. DATE OCT 1989 13. .. JAN 1990 09. .. MAY 02. . . JUL 23... DATE OCT 1989 13. .. JAN 1990 09. .. MAY 02. .. JUL 23. .. DATE OCT 1989 13. .. JAN 1990 09. .. MAY 02. . . JUL 23. .. TIME 1515 0930 0948 1050 HARD- NESS NONCARB WH WAT TOT FLD MG/L AS CACO3 0 0 0 0 SOLIDS, RESIDUE AT 180 DEC. C DIS- SOLVED (MG/L) 125 167 149 160 ALUM- INUM, DIS- SOLVED (UG/L AS AL) 40 50 <10 60 DIS- CHARGE, INST. CUBIC FEET PER SECOND 519 130 62 60 CALCIUM DIS- SOLVED (MG/L AS CA) 22 28 27 28 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 145 169 167 165 ARSENIC DIS- SOLVED (UG/L AS AS) <1 <1 <1 <1 SPE- CIFIC CON- DUCT- ANCE (US/CM) 208 233 255 254 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 8.3 9.7 10 9.5 SOLIDS, DIS- SOLVED (TONS PER DAY) 175 58. 6 28.3 27.1 BARIUM, DIS- SOLVED (UG/L AS BA) 33 35 39 36 PH (STAND- ARD UNITS) 7.40 8.20 7.80 8.40 SODIUM, DIS- SOLVED (MG/L AS NA) 8.3 10 11 11 NITRO- GEN, N02+N03 DIS- SOLVED (MG/L AS N) 1.30 0.92 0.40 0.20 BERYL- LIUM, DIS- SOLVED (UG/L AS BE) <0.5 <0.5 <0.5 <0.5 TEMPER- ATURE WATER (DBG C) 25.5 22.0 25.0 28.0 SODIUM AD- SORP- TION RATIO 0.4 0.4 0.5 0.5 NITRO- GEN, AMMONIA DIS- SOLVED (MG/L AS N) 0.01 0.03 0.03 0.04 CADMIUM DIS- SOLVED (UG/L AS CD) <1.0 <1.0 <1.0 2.0 TUR- BID- ITY (NTU) 52 1.1 2.5 7.2 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 2.7 1.4 1.7 1.6 NITRO- GEN, AMMONIA DIS- SOLVED (MG/L AS NH4) 0.01 0.04 0.04 0.05 CHRO- MIUM, DIS- SOLVED (UG/L AS CR) 2 1 <1 <1 OXYGEN, DIS- SOLVED (MG/L) 7.8 8.9 7.9 8.8 ALKA- LINITY WAT WH TOT PET FIELD MG/L AS CACO3 85 110 100 110 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.40 0.20 0.30 0.20 COBALT, DIS- SOLVED (UG/L AS CO) <3 <3 <3 <3 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 95 100 95 112 SULFATE DIS- SOLVED (MG/L AS S04) 10 10 11 12 PHOS- PHORUS TOTAL (MG/L AS P) 0.09 0.06 0.04 0.04 COPPER, DIS- SOLVED (UG/L AS CU) 1 <10 2 3 COLI- FORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) 20000 3500 500 210 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 6.4 7.0 9.0 7.6 PHOS- PHORUS DIS- SOLVED (MG/L AS P) 0.03 0.06 0.03 0.02 IRON, DIS- SOLVED (UG/L AS FE) 54 15 13 62 STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) 8600 K100 K50 K40 FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.10 0.10 <0.10 0.30 PHOS- PHORUS ORTHO, DIS- SOLVED (MG/L AS P) 0.01 0.05 0.03 0.03 LEAD, DIS- SOLVED (UG/L AS PB) <1 <10 1 23 HARD- NESS TOTAL (MG/L AS CAC03) 89 110 110 110 SILICA, DIS- SOLVED (MG/L AS SIO2) 30 32 32 32 PHOS- PHATE, ORTHO, DIS- SOLVED (MG/L AS P04) 0.12 0.15 0.09 0.09 LITHIUM DIS- SOLVED (UG/L AS LI) <4 <4 <4 <4 K = non-ideal count RIO GRANDE DE ANASCO BASIN 50144000 RIO GRANDE DE ANASCO NEAR SAN SEBASTIAN, PR--Continued (NATIONAL STREAM-QUALITY ACCOUNTING NETWORK STATION) WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 383 DATE OCT 1989 13.. . JAN 1990 09.. . MAY 02. .. JUL 23. .. MANGA- NESE, MERCURY DIS- DIS- SOLVED SOLVED (UG/L (UG/L AS MN) AS HG) 9 <0.1 11 <0.1 29 <0.1 22 <0.1 MOLYB- DENUM, NICKEL, DIS- DIS- SOLVED SOLVED (UG/L (UG/L AS MO) AS NI) <10 1 <10 <10 <10 1 <10 2 SELE- STRON- VANA- NIUM, SILVER, TIUM, DIUM, DIS- DIS- DIS- DIS- SOLVED SOLVED SOLVED SOLVED (UG/L (UG/L (UG/L (UG/L AS SB) AS AG) AS SR) AS V) <1 <1.0 120 <6 <1 <1.0 140 <6 <1 <1.0 140 7 <1 <1.0 150 7 ZINC, DIS- SOLVED (UG/L AS ZN) 19 12 <3 3 PARTICLE- SIZE DISTRIBUTION OF SUSPENDED SEDIMENT SED. SEDI- SUSP. MENT, SIEVE STREAM- SEDI- DIS- DIAM. FLOW, MENT, CHARGE, PERCENT INSTAN- SUS- SUS- FINER DATE OCT 1989 13. .. JAN 1990 09. . . MAY 02. .. JUL 23. . . TIME TANEOUS FENDED FENDED THAN (CFS) 1515 519 0930 130 0948 62 1050 60 (MG/L) (T/DAY) .062 MM 97 136 88 12 4.2 4 49 8.2 51 16 2.6 93 384 RIO GRANDE DE ANASCO BASIN 50146000 RIO GRANDE DE ANASCO NEAR ANASCO, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°16'00", long 67°08'05", at bridge on Highway 430, 0.2 mi (0.3 km) south of Highway 109 at El Espino and 1.4 mi (2.3 km) east-southeast from Anasco plaza. DRAINAGE AREA.--139 mi j (360 kmj ) this does not include 39.7 mi 1 (102.8 kmj ), flow is diverted to south coast. PERIOD OP RECORD.—Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 12. .. DEC 12. .. PEB 1990 06. . . MAY 09. . . JUN 27. . . AUG 21. . . TIME 0830 0915 1130 1025 0930 0915 DIS- CHARGE, INST. CUBIC PEET PER SECOND 685 224 109 300 86 122 SPE- CIPIC CON- DUCT- ANCE (US /CM) 224 239 239 204 235 229 PH (STAND- ARD UNITS) 7.40 7.50 7.90 7.40 7.40 7.50 TEMPER- ATURE WATER (DBG C) 24.0 23 .0 23.0 26.5 27.0 28.0 TUR- BID- ITY (NTU) 7.6 1.4 1.0 180 11 46 OXYGEN, DIS- SOLVED (MG/L) 8.0 8.4 8.7 7.3 6.7 6.5 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 93 96 99 89 82 81 OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 16 14 11 42 15 <10 COLI- PORM, FECAL, 0.7 UM-MF (COLS . / 100 ML) K2200 K160 K36 4300 210 K970 STREP- TOCOCCI FECAL, KP AGAR (COLS. PER 100 ML) K1500 K60 K20 8200 580 270 OCT 1989 12. .. DEC 12. . . PEB 1990 06. . . MAY 09. .. JUN 27. . . AUG 21. . . HARD- NESS TOTAL (MG/L AS HARD- NESS NONCARB WH WAT TOT PLD CALCIUM DIS- SOLVED MG/L AS (MG/L CACO3) CACO3 92 0 23 81 0 22 98 0 25 MAGNE- SIUM, DIS- SODIUM, DIS- SOLVED SOLVED (MG/L (MG/L AS CA) AS MG) AS NA) 8.4 9.3 6.4 8.0 1.6 10.0 SODIUM AD- SORP- TION RATIO POTAS- SIUM, DIS- SOLVED ALKA- LINITY WAT WH TOT PET FIELD SULPIDE TOTAL SULPATE DIS- SOLVED (MG/L MG/L AS (MG/L AS K) 0.4 1.7 0.4 2.3 0.5 2.0 CACO3 93 110 110 73 97 100 (MG/L <0.5 9.0 <0.5 12 CHLO- RIDE, DIS- SOLVED (MG/L AS S) AS SO4) AS CL) 6.8 8.9 8.2 SOLIDS, DATE OCT 1989 12.. . DEC 12. .. PEB 1990 06. .. MAY 09. .. JUN 27.. . AUG 21.. . FLUO- RIDE, DIS- SOLVED (MG/L AS P) 0.10 -- -- <0.10 -- 0.10 SILICA, DIS- SOLVED (MG/L AS SIO2) 30 -- -- 23 -- 32 SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 144 -- -- 127 -- 150 SOLIDS, DIS- SOLVED (TONS PER DAY) 266 -- -- 103 -- 50.3 TOTAL AT 105 DEG. C, SUS- PENDED (MG/L) 3 <1 3 298 7 1 NITRO- GEN, NITRATE TOTAL (MG/L AS N) 1.09 0.59 0.29 0.85 0.38 0.29 NITRO- GEN, NITRITE TOTAL (MG/L AS N) 0.01 0.01 0.01 0.05 0.02 0.01 NITRO- GEN, NO2 +NO3 TOTAL (MG/L AS N) 1.10 0.60 0.30 0.90 0.40 0.30 NITRO- GEN, AMMONIA TOTAL (MG/L AS N) 0.01 0.02 0.01 0.10 0.03 0.07 NITRO- GEN, ORGANIC TOTAL (MG/L AS N) 0.19 0.28 0.19 0.80 -- 0.13 K = non-ideal count RIO GRANDE DE ANASCO BASIN 50146000 RIO GRANDE DE ANASCO NEAR ANASCO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 385 DATE NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) NITRO- NITRO- PHOS- GEN, GEN, PHORUS ARSENIC TOTAL TOTAL TOTAL TOTAL (MG/L (MG/L (MG/L (UG/L AS N) AS N03) AS P) OCT 1989 12.. . DEC 12.. . FEE 1990 06. .. MAY 09.. . JUN 27. .. AUG 21. . . 0. 0. 0. 0, <0. 0. ,20 ,30 ,20 .90 ,20 ,20 1. 0. 0. 1. -- 0. 3 90 50 8 50 5. 4. 2. 8. -- 2. 8 0 2 0 2 0. 0, 0, 0. 0, 0, .06 .03 .02 .07 .05 .04 BARIUM, TOTAL RECOV- ERABLE (UG/L <100 200 BORON, CADMIUM TOTAL TOTAL RECOV- RECOV- ERABLE BRABLB (UG/L (UG/L AS AS) AS BA) AS B) 30 AS CD) CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) 10 COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) 10 20 DATE OCT 1989 12. .. DEC 12. .. FEE 1990 06. .. MAY 09. . . JUN 27. .. AOG 21.. . IRON, TOTAL RECOV- ERABLE (UG/L AS FE) LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MM) MERCURY TOTAL RECOV- ERABLE (UG/L AS HG) SELE- NIUM, TOTAL (UG/L AS SE) SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) CYANIDE TOTAL (MG/L AS CN) PHENOLS TOTAL (UG/L) METHY- LENE BLUB ACTIVE SUB- STANCE (MG/L) 850 12000 70 30 <0.010 0.010 0.05 PESTICIDE ANALYSES DATE JUN 1990 27. .. JUN 1990 27... TIME 0930 ENDRIN, TOTAL (UG/L) PCB, TOTAL (UG/L) <0.1 ETHION, TOTAL (UG/L) ALDRIN, TOTAL (UG/L) <0. 010 HEPTA- CHLOR, TOTAL (UG/L) CHLOR- DANB, TOTAL (UG/L) <«- HEPTA- CHLOR EPOXIDE TOTAL (UG/L) ODD, TOTAL (UG/L) <0.010 LINDANE TOTAL (UG/L) DDE, TOTAL (UG/L) <0.010 MALA- THION, TOTAL (UG/L) DOT, TOTAL (UG/L) <0.010 METH- OXY- CHLOR, TOTAL (UG/L) DI- AZINON, TOTAL (UG/L) 0. 02 METHYL PARA- THION, TOTAL (UG/L) DI- ELDRIN TOTAL (UG/L) <0. 010 METHYL TRI- THION, TOTAL (UG/L) ENDO- SULFAN, TOTAL (UG/L) <0.010 MI REX, TOTAL (UG/L) <0.010 <0.01 <0.010 <0.010 <0.010 <0.01 <0.01 <0.01 <0.01 DATE JUN 1990 27.. . PARA- THION, TOTAL (UG/L) NAPH- THA- LENES, POLY- CHLOR. TOTAL (UG/L) PER- THANE TOTAL (UG/L) TOX- APHENE, TOTAL (UG/L) TOTAL TRI- THION (UG/L) 2,4-D, TOTAL (UG/L) 2,4,5-T TOTAL (UG/L) 2, 4-DP TOTAL (UG/L) SILVEX, TOTAL (UG/L) 0.04 <0.01 <0.01 <0.01 386 THIS PAGE WAS LEFT BLANK INTENTIONALLY AGUAOILLA Drainage boundary uncertain / X™*-—>«* LARES SURFACE-WATER STATION AND NUMBER QUALITY-OF-WATER STATION AND NUMBER WELL AND WELL NUMBER 3345 6KiLQMETEi?S CO 00 Figure 26.--Rio Culebrinas basin. 388 RIO CDLEBRINAS BASIN 50147600 RIO CULEBRINAS NEAR SAN SEBASTIAN, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°20'5l», long 67°02'40", at bridge on Highway 423, 1.3 mi (2.1 km) south of Quebrada El Salto Bridge on Highway 111, and 2.1 mi (3.4 km) west of Central La Plata. DRAINAGE AREA.--58.2 mi » (150.7 km»). PERIOD OF RECORD.—Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 13. .. DEC 12. .. FEE 1990 06. .. MAY 08. . . JUN 25. .. AUG 21. . . DATE OCT 1989 13. .. DEC 12. .. FEE 1990 06. . . MAY 08. . . JUN 25. . . AUG 21. . . TIME 0945 1215 1400 0915 1315 1200 HARD- NESS TOTAL (MG/L AS CACO3 ) 110 -- -- 51 -- 110 DIS- CHARGE, INST. CUBIC FEET PER SECOND 144 59 23 38 62 60 HARD- NESS NONCARB WH WAT TOT FLD MG/L AS CAC03 8 -- -- 0 -- 3 SPE- CIFIC CON- DUCT- ANCE (US/CM) 265 247 300 162 331 229 CALCIUM DIS- SOLVED (MG/L AS CA) 35 -- -- 16 -- 36 PH (STAND- ARD UNITS) 7.30 7.80 8.40 7.00 7.80 8.10 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 4 .9 -- -- 2.8 -- 5.4 TEMPER- ATURE WATER (DEC C) 24.0 23.5 25.0 25.0 27.0 28.5 SODIUM, DIS- SOLVED (MG/L AS NA) 11 -- -- 9.8 -- 12 TUR- BID- ITY (NTU) 14 2.8 2.5 230 10 4.7 SODIUM AD- SORP- TION RATIO 0.5 -- -- 0.6 -- 0.5 OXYGEN, DIS- SOLVED (MG/L) 8.40 10.9 10.6 6.2 7.9 7.6 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 2.5 -- -- 2.1 -- 2.3 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 99 126 126 74 98 96 ALKA- LINITY WAT WH TOT FET FIELD MG/L AS CAC03 100 100 120 47 130 120 OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 18 20 23 28 21 12 SULFIDE TOTAL (MG/L AS S) <0.5 -- -- <0.5 -- -- COLI- FORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) K16000 5600 3000 K10000 K960 4700 SULFATE DIS- SOLVED (MG/L AS S04) 10 -- -- 12 -- 10 STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) 3000 450 100 4300 300 K1200 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 9.6 -- -- 9.8 -- 9.7 DATE OCT 1989 13.. . DEC 12. .. FEE 1990 06. . . MAY 08.. . JUN 25.. . AUG 21. . . FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.10 -- -- 0.40 -- 0.10 SILICA, DIS- SOLVED (MG/L AS SI02) 30 -- -- 20 -- 34 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 163 -- -- 98 -- 170 SOLIDS, DIS- SOLVED (TONS PER DAY) 63.4 -- -- 10.0 -- 34.0 RESIDUE TOTAL AT 105 DEG . C , SUS- PENDED (MG/L) 9 <1 2 316 7 17 NITRO- GEN, NITRATE TOTAL (MG/L AS N) 1.36 1.53 1.13 1.12 0.83 1.06 NITRO- GEN, NITRITE TOTAL (MG/L AS N) 0.04 0.07 0.07 0.08 0.07 0.04 NITRO- GEN, N02+N03 TOTAL (MG/L AS N) 1.40 1.60 1.20 1.20 0.90 1.10 NITRO- GEN, AMMONIA TOTAL (MG/L AS N) 0.09 0.04 0.08 0.15 0.05 0.09 NITRO- GEN, ORGANIC TOTAL (MG/L AS N) 0.41 0.36 0.42 0.55 0.25 0.31 K = non-ideal count RIO CULEBRINAS BASIN 50147600 RIO CULEBRINAS NEAR SAN SEBASTIAN, PR—Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 389 DATE OCT 1989 13.. . DEC 12.. . PEB 1990 06.. . MAY 08.. . JUN 25. . . AUG 21. . . DATE OCT 1989 13.. . DEC 12 ... PEB 1990 06.. . MAY 08.. . JUN 25. . . AUG 21.. . NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.50 0.40 0.50 0.70 0.30 0.40 IRON, TOTAL RECOV- ERABLE (UG/L AS PE) 760 -- -- 15000 -- -- NITRO- GEN, TOTAL (MG/L AS N) 1.9 2.0 1.7 1.9 1.2 1.5 LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) 2 -- -- 4 -- -- NITRO- GEN, TOTAL (MG/L AS N03) 8.4 8.9 7.5 8.4 5.3 6.6 MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MM) 60 -- -- 190 -- -- PHOS- PHORUS TOTAL (MG/L AS P) 0.08 0.14 0.21 0.10 0.09 0.09 MERCURY TOTAL RECOV- ERABLE (UG/L AS HG) <0. 10 • -- <0.10 -- -- BARIUM, TOTAL ARSENIC RECOV- TOTAL ERABLB (UG/L (UG/L AS AS) AS BA) <1 <100 __ __ <1 <100 _~ - - - - SILVER, SELE- TOTAL NIUM, RECOV- TOTAL ERABLE (UG/L (UG/L AS SB) AS AG) <1 <1 __ __ <1 <1 __ __ BORON, TOTAL RECOV- ERABLE (UG/L AS B) 30 -- -- 30 -- " ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) <10 -- -- 20 -- -- CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- <1 -- " CYANIDE TOTAL (MG/L AS CN) <0.010 -- -- <0.010 -- -- CHRO- MIUM, COPPER, TOTAL TOTAL RECOV- RECOV- ERABLE ERABLE (UG/L (UG/L AS CR) AS CU) <1 10 __ -- 5 20 __ __ METHY- LENE BLUE ACTIVE PHENOLS SUB- TOTAL STANCE (UG/L) (MG/L) 1 0.02 __ __ <1 0.11 __ __ 390 RIO CULEBRINAS BASIN 50147800 RIO CULEBRINAS AT HIGHWAY 404 NEAR MOCA, PR LOCATION.-- La t 18°21'42 M , long 67°05'33", Hydrologic Unit 21010003, on right bank, at bridge on Highway 404, 0.3 ml (0.5 km) downstream from Quebrada Yagruma, and 2.8 mi (4.5 km) southeast of Moca. DRAINAGE AREA.--71.2 mi> (184.4 km1 ). WATER-DISCHARGE RECORDS PERIOD OP RECORD.--July 1967 to current year. GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 45 ft (14 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. Gage-height and precipitation satellite telemetry at station. AVERAGE DISCHARGE.--23 years (1968-90), 298 ft'/s (8.439 m'/s), 56.84 in/yr (1,444 mm/yr), 215,900 acre-ft/yr (266 hm'/yr); median of yearly mean discharges, 285 ft3 /s (8.07 m'/s), 206,000 acre-ft/yr (254 hm'/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 69,000 ftVs (1,950 m'/s). Sept. 16, 1975, gage height, 36.6 ft (11.2 m) from slope-area measurement, but may have been exceeded by flood of Oct. 23, 1974, from rating curve extended above 2,600 ft'/s (73.6 m'/s) on basis of slope-area and contracted-opening measurements of peak flow; minimum discharge, 16 ft'/s (0.453 m3/s) , Apr. 17-19, 1979. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 11,300 ft3/s (320 m3/s) and maximum (*): Date Oct. Oct. Oct. 2 3 15 Time 1845 2200 2000 Discharge (ftVs) (mVs) 13, 16, 16, 900 700 900 394 473 479 Gage (ft) 23, 24, 25, .62 .77 ,00 height (m) 7 7 7 .199 .550 .620 Date Oct. Oct. Oct. 19 22 26 Time 2130 2100 1900 Discharge (ftVs) (mj /s) 15, *17, 16, 700 100 600 445 484 470 Gage height (ft) (m) 24. *25. 24. 55 07 90 7. 7. 7. 483 641 590 Minimum discharge, 23 ftVs (0.651 m} /s). May 2-8. DISCHARGE, CDBIC FEET PER SECOND, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 MEAN VALUES DAY NOV DEC JAN FEB MAR APR JUL SEP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN AC-FT CFSM IN. CAL YR WTR YR 319 2870 2600 1500 617 402 308 575 322 250 231 267 233 1270 3510 608 529 350 3710 752 950 3570 696 362 928 3430 623 346 320 269 246 32963 1063 3710 231 65380 14.9 17.22 1989 1990 230 211 198 189 182 177 175 165 191 376 201 151 144 142 137 132 800 422 159 203 172 140 162 155 129 124 120 117 114 112 --- 5930 198 800 112 11760 2.78 3.10 TOTAL 97922 TOTAL 76614 110 109 114 105 104 101 101 99 97 95 94 92 91 90 88 89 92 87 86 85 83 81 79 79 77 79 76 84 124 78 93 2862 92.3 124 76 5680 1.30 1.50 MEAN 268 MEAN 210 119 84 82 75 72 70 69 68 71 65 62 60 59 59 57 56 58 55 54 54 54 56 55 53 53 53 54 53 49 50 50 1929 62.2 119 49 3830 .87 1.01 MAX MAX 49 49 49 47 45 47 47 51 48 53 55 57 95 60 51 47 45 45 51 52 46 45 45 41 41 40 42 39 ___ ___ --- 1382 49.4 95 39 2740 .69 .72 3710 MIN 3710 MIN 41 38 40 38 39 38 39 37 36 41 37 43 49 46 43 39 37 35 38 43 48 42 92 103 48 39 36 34 34 65 42 1380 44.5 103 34 2740 .63 .72 35 AC-FT 24 AC-FT 40 74 93 47 37 35 34 32 31 30 29 31 63 40 35 32 32 44 101 44 38 32 29 28 27 29 27 26 25 25 --- 1190 39.7 101 25 2360 .56 .62 194200 152000 24 24 24 24 24 24 24 162 675 e!350 e226 e!25 e72 e60 e53 e48 47 45 60 50 50 42 39 39 37 35 35 34 32 39 52 3575 115 1350 24 7090 1.62 1.87 CFSM 3.77 CFSM 2.95 98 133 54 87 116 184 177 106 158 113 81 80 118 127 1160 191 548 671 306 162 125 109 101 149 120 103 88 80 76 73 --- 5694 190 1160 54 11290 2.67 2.97 IN. 51. IN. 40. 70 67 65 62 185 254 357 228 113 100 353 200 108 1310 274 151 123 437 290 203 130 113 104 477 211 135 163 164 117 101 140 6805 220 1310 62 13500 3.08 3.56 16 03 215 105 133 102 89 252 121 110 226 191 213 261 117 117 99 91 86 312 162 102 91 125 184 167 117 98 90 88 88 126 94 4372 141 312 86 8670 1.98 2.28 86 81 83 101 153 152 247 396 496 910 379 e223 613 359 639 288 325 890 315 202 175 156 225 153 181 131 123 116 112 222 8532 284 910 81 16920 3.99 4.46 e Estimated RIO CULEBRINAS BASIN 50147800 RIO COLEBRINAS AT HIGHWAY 404 NEAR MOCA, PR--Continued WATER QUALITY RECORDS 391 PERIOD OF RECORD.--WATER YEARS AUGUST 1981 TO CURRENT YEAR STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TORE (CFS) (UMHOS) (DBG C) OCT. NOV. DEC. JAN. FEB. MAR. 12 0916 15 0831 07 1010 10 0921 14 0855 15 0758 211 136 101 64.5 56.1 41.6 198 110 170 216 200 270 26.0 26.0 25.0 26.0 25.0 25.0 DATE TIME APR. 11 0926 JUNE 06 0920 JULY 18 1148 AUG. 15 1042 SEPT 13 1438 STREAMFLOW, INSTANTANEOUS (CFS) 26.7 141 120 99 172 SPECIFIC CON- TEMPERA- DUCTANCE TURB (UMHOS) (DEG C) 290 210 343 272 285 24.0 23.0 23.0 27.0 23.0 392 RIO CtJLEBRINAS BASIN 50149100 RIO CULEBRINAS NEAR AGOADA, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°24'03", long 67°09'40", at bridge on Highway 2, and 2.3 mi (3.7 km) northeast of Aguada plaza. DRAINAGE AREA.--97.0 mi J (251.2 kmj ). PERIOD OF RECORD.--Water years 1958, 1970 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE OCT 1989 12. .. DEC 12. .. FEE 1990 07. . . MAY 09. .. JUN 27. .. AUG 21. . . TIME 1345 1600 0915 0820 1237 1515 DIS- CHARGE, INST. CUBIC FEET PER SECOND 254 138 38 330 148 132 SPE- CIFIC CON- DUCT- ANCE (US/CM) 297 283 288 200 390 339 PH (STAND- ARD UNITS) 7.60 7.70 7.40 6.90 7.60 7. 60 TEMPER- ATURE WATER (DEC C) 25.5 24.5 27 .0 25.0 27.5 29.0 TUR- BID- ITY (NTU) 24 4.6 6.8 900 24 5.4 OXYGEN, DIS- SOLVED (MG/L) 5.3 7.8 2.7 5.4 5.4 5.4 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 64 92 33 64 67 69 OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 22 30 13 100 53 19 COLI- FORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) K1500 200 K4400 K170000 600 600 STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) K730 460 55000 90000 500 440 DATE OCT 1989 12. .. DEC 12. .. FEB 1990 07. . . MAY 09. .. JUN 27. .. AUG 21. . . HARD- NESS TOTAL (MG/L AS HARD- NESS NONCARB WH WAT TOT FLD CALCIUM DIS- SOLVED MG/L AS (MG/L 42 CAC03) CAC03 130 80 150 25 52 MAGNE- SIUM, SODIUM, DIS- DIS- SOLVED SOLVED (MG/L (MG/L AS CA) AS MG) AS NA) 5.5 12 3.1 7.6 6.0 13 SODIUM AD- SORP- TION RATIO POTAS- SIUM, DIS- SOLVED ALKA- LINITY WAT WH TOT FET FIELD SULFIDE TOTAL SULFATE DIS- SOLVED (MG/L MG/L AS (MG/L AS K) 0.5 2.1 0.4 3.1 0.5 3.3 CAC03 120 120 140 66 150 130 (MG/L CHLO- RIDE, DIS- SOLVED (MG/L AS S) AS SO4) AS CL) <0.5 10 11 <0.5 17 10 7.9 14 DATE OCT 1989 12. .. DEC 12. .. FEB 1990 07.. . MAY 09. .. JUN 27. .. AUG 21. .. FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.10 -- -- <0.10 -- 0.10 SILICA, DIS- SOLVED (MG/L AS SI02) 30 -- -- 10 -- 26 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 185 -- 113 -- 200 SOLIDS, DIS- SOLVED (TONS PER DAY) 127 -- -- 58.8 -- 72. 6 RESIDUE TOTAL AT 105 DEC. C, SUS- PENDED (MG/L) 48 26 22 2510 61 35 NITRO- GEN, NITRATE TOTAL (MG/L AS N) 1.18 0.79 -- 1.63 0.59 0.68 NITRO- GEN, NITRITE TOTAL (MG/L AS N) 0.02 0.01 <0. 01 0.07 0.01 0.02 NITRO- GEN, N02+N03 TOTAL (MG/L AS N) 1.2 0.80 0.30 1.7 0.60 0.70 NITRO- GEN, AMMONIA TOTAL (MG/L AS N) 0.06 0.07 0.02 0.16 0. 14 0.11 NITRO- GEN, ORGANIC TOTAL (MG/L AS N) 0.44 0.83 -- 1.5 1.3 0.39 K = non-ideal count RIO CULEBRINAS BASIN 50149100 RIO CULEBRINAS NEAR AGOADA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 393 DATE OCT 1989 12. .. DEC 12... FEB 1990 07.. . MAY 09.. . JUN 27. .. AUG 21. . . DATE OCT 1989 12.. . DEC 12. .. FBB 1990 07. .. MAY 09.. . JUN 27.. . AUG 21.. . NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.50 0.90 <0.20 1.7 1.4 0.50 IRON, TOTAL RECOV- ERABLE (UG/L AS FB) 2400 -- -- 86000 -- -- NITRO- GEN, TOTAL (MG/L AS N) 1.7 1.7 -- 3.4 2.0 1.2 LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) 16 -- -- 24 -- -- NITRO- GEN, TOTAL (MG/L AS NO3) 7.5 7.5 -- 15 8.9 5.3 MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) 100 -- -- 1700 -- -- PHOS- PHORUS TOTAL (MG/L AS P) 0.11 0.11 0.06 0.16 0.08 0.09 MERCURY TOTAL RECOV- ERABLE (UG/L AS HG) 0.20 -- -- 0.20 -- -- BARIUM, TOTAL ARSENIC RECOV- TOTAL ERABLE (UG/L (UG/L AS AS) AS BA) <1 <100 __ __ <1 300 __ - _ _- SILVER, SELE- TOTAL NIOM, RECOV- TOTAL ERABLE (DG/L (UG/L AS SE) AS AG) <1 <1 __ __ 1 <1 __ _- BORON, TOTAL RECOV- ERABLE (UG/L AS B) 50 -- -- 30 -- " ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) 10 -- -- 130 -- -- CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- <1 -- " CYANIDE TOTAL (MG/L AS CN) <0.010 -- -- <0.010 -- -- CHRO- MIUM, COPPER, TOTAL TOTAL RECOV- RECOV- ERABLE ERABLE (UG/L (UG/L AS CR) AS CU) 2 10 __ __ 32 110 __ ._ METHY- LENE BLUE ACTIVE PHENOLS SUB- TOTAL STANCE (UG/L) (MG/L) 3 0.06 __ __ <1 0.21 __ __ PESTICIDE ANALYSES JUN 1990 27. .. TIME 1237 PCB, TOTAL (UG/L) ALDRIN, TOTAL CHLOR- DANE, TOTAL (DG/L) (UG/L) <0.010 ODD, TOTAL (DG/L) DDE, TOTAL (DG/L) DOT, TOTAL (UG/L) <0,010 <0.010 <0.010 DI- AZINON, TOTAL (DG/L) DI- BLDRIN TOTAL (DG/L) ENDO- SULFAN, TOTAL (UG/L) 0.11 <0.010 <0.010 DATE JUN 1990 27. .. ENDRIN, TOTAL (DG/L) <0.010 ETHION, TOTAL (UG/L) <0.01 HEPTA- CHLOR, TOTAL (DG/L) <0.010 HEPTA- CHLOR EPOXIDE TOTAL (UG/L) <0.010 LINDANE TOTAL (DG/L) <0.010 MALA- THION, TOTAL (UG/L) <0.01 METH- OXY- CHLOR, TOTAL (UG/L) <0.01 METHYL PARA- THION, TOTAL (UG/L) <0.01 METHYL TRI- THION, TOTAL (DG/L) <0.01 MI REX, TOTAL (UG/L) <0.01 DATE JUN 1990 27... PARA- THION, TOTAL (UG/L) <0.01 NAPH- THA- LENES, POLY- CHLOR. TOTAL (DG/L) <0.10 PER- THANE TOTAL (DG/L) <0.1 TOX- APHENE, TOTAL (UG/L) <1 TOTAL TRI- THION (UG/L) <0.01 2,4-D, TOTAL (DG/L) 0.15 2,4,5-T TOTAL (DG/L) <0.01 2, 4-DP TOTAL (UG/L) <0.01 SILVEX, TOTAL (UG/L) <0.01 394 THIS PAGE WAS LEFT BLANK INTENTIONALLY 395 Discharge Partial-Record Stations in Puerto Rico 396 DISCHARGE AT PARTIAL-RECORD STATIONS As the number of streams on which streamflow information is likely to be desired far exceeds the number of stream-gaging stations feasible to operate at one time, the Geological Survey collects limited streamflow data at sites other than stream-gaging stations. When limited streamflow data are collected on a systematic basis over a period of years for use in hydrologic analyses, the site at which the data are collected is called a partial-record station. Data collected at these partial-record stations are useable in low-flow or floodflow analyses, depending on the type of data collected. In addition, discharge measurements are made at other sites not included in the partial- record program. These measurements are generally made in times of drought or flood to give better areal coverage to those events. Those measurements and others collected for some special reason are called measurements at miscellane- ous sites. Low-flow partial-record stations Measurements of streamflow in the areas covered by this report made at low-flow partial-record stations are given in the following table. These measurements were made during periods of base flow when streamflow is pri- marily from ground-water storage. These measurements, when correlated with the simultaneous discharge of nearby stream when continuous records are available, will give a picture of the low-flow potentiality of stream. Discharge measurements made at low-flow partial-records stations during water year 1990 PUBLICATION RECORD STATION NUMBER STATION NAME 50095900 Quebrada Melania near Jobos, PR 50097000 Quebrada Cimarrona near Jobos, PR 50097800 Rio Seco near Central Guamani, PR 50100200 Rio Lapa near Rabo del Buey, PR 50100300 Rio Jajome at Jajome, PR 50100450 Rio Majada at La Plena, PR 50100700 Rio Majada at Rabo del Buey, PR LOCATION AND BASIN Rio Melania basin Lat 17°57'51", long 66°59'30' Hydrologic unit 21010004. 0.6 mi (1.0 km) upstream from bridge on Hwy 3. Lat 17°59'18", long 66°10'59". Hydrologic unit 21010004. Barrio Pozo Hondo, 2.4 mi (3.7 km) north from Puerto de Jobos, and 4.0 mi (6.4 km) northwest from Guayama Plaza. Rio Seco basin Lat 17°58'06", long 66°10'52". Hydrologic unit 21010004. At Bridge on Hwy 3, .2 mi (0.3 (0.3 km) north of Central Guamani, and 1.2 mi (1.9 km) northwest of Jobos. Rio Salinas (Nigua) basin Lat 18°03'36", long 66°14'28". Hydrologic unit 21010004. Barrio Lapa, at Hwy 1, 1.6 mi (2.6 km) upstream from conflu- ence with Rio Majada, and 6.2 mi (10 km) southwest from Cayey Plaza. Lat 18°03'49", long 66°09'38". Hydrologic unit 21010004. Barrio Jajome Bajo, at Hwy 708, 3.5 mi (5.6 km) south from Cayey Plaza. Lat 18°02'40", long 66°12'27". Hydrologic unit 21010004. Barrio Quebrada Yegua, at Hwy 712, 2.0 mi (3.2 km) northeast from Albergue Olimpico, and 5.5 mi (8.8 km) southwest fron Cayey Plaza. Lat !8<>02'17", long 66°14'27". Hydrologic unit 21010004. Barrio Lapa, 0.2 mi (0.3 km) upstream from confluence with Rio Lapa, 400 ft upstream from intersection of Hwy's 1 and 712, and 0.2 mi (0.3 km) nortwest from Albergue Olimpico. DRAINAGE AREA (km») 2.75 (7.13) 3.09 (8.00) 11.2 (29.0) 10.0 (25.8) 4.56 (11.8) 16.7 (43.2)) 22.2 (57.5) DATE 3/12/90 4/09/90 3/12/90 4/09/90 3/12/90 4/09/90 3/12/90 4/09/90 3/12/90 4/09/90 3/12/90 4/09/90 3/12/90 4/09/90 TIME 1050 1045 1120 1140 1115 1115 1340 1400 1300 1310 1215 1300 1200 STREAM- FLOW ft'/s (m'/s) 0.59 (0.017) 0.18 (0.005) 0.00 0.00 0.00 0.00 0.95 (0.027) 0.57 (0.016) 1.35 (0.038) 0.36 (0.010) 0.98 (0.028) 0.60 (0.017) 0.00 0.00 STATION NUMBER STATION NAME 50102000 Rio Salinas at Salinas, PR 50102400 Rio Jueyes at Rio Jueyes, PR 50103000 Rio Jueyes near Jauca, PR 50104000 Rio Coamo near Pasto, PR 50105400 Rio Cuyon at La Guava, PR 50105600 Rio Cuyon near Coamo, PR 50105900 Quebrada Monteria near Coamo, PR Rio Coamo at Coamo, PR 50106600 Rio de La Mina near Coamo, PR 50106650 Rio del Pasto near Coamo, PR DISCHARGE AT PARTIAL-RECORD STATIONS Low-flow partial-record stations — Continued LOCATION AND BASIN Lat 17°58'42«, long 66°18'17". Hydrologic unit 21010004. At Bridge on Hwy 1, and 0.4 mi (0.6 km) west from Salinas Plaza. Rio Jueyes basin Lat 18°01'17 H , long 66°19'51 M . 3.50 Hydrologic unit 21010004. (9.06) Barrio Rio Jueyes, at Hwy 154, 1.3 mi (2.1 km) upstream from Hwy 52, and 4.5 mi (7.2 km) Southeast from Coamo Plaza. Lat 17°58'45", long 66°20'20". 8.56 Hydrologic unit 21010004. At (22.2) bridge on Hwy 1, 1.8 mi (2.9 km) east of Jaucas, and 2.7 mi (4.3 km) west of Salinas Plaza. Rio Coamo basin Lat 18°07'08", long 66°21'52". Hydrologic unit 21010004. Barrio Pasto, at Hwy 555, 2.6 mi (4.2 km) northwest from Coamo Plaza. Lat 18°05'20", long 66°16'17". Hydrologic unit 21010004. Barrio Algarrobo, at Hwy 717, 1.0 mi (1.6 km) southwest from Cerro Verdun, and 5.6 mi (9.0 km) east from Coamo Plaza. Lat 18°05'25", long 66°18'50". Hydrologic unit 21010004. Barrio Cuyon, at Hwy 14, 0.8 mi (1.3 km) southeast from Cerro Santa Ana, and 2.8 mi (4.5 km) northeast from Coamo Plaza. Lat 18°05'13", long 66°21'04». Hydrologic unit 21010004. Barrio Pasto, at confluence with Rio Cuyon, and 0.5 mi (0.8 km) northeast from Coamo Plaza. Lat 18°05'00 M , long 66°21'16". Hydrologic unit 21010004. Coamo, at Hwy 14, 500 ft (152 m) downstream from con- fluence with Rio Cuyon, and 0.2 mi (0.3 km) east from Coamo Plaza. Lat 18°05'04", long 66°23'22". 2.62 Hydrologic Unit 21010004. (6.78) Barrio Santa Catalina, at Hwy 150, 2.2 mi (3.5 km) west from Coamo Plaza. Lat 18°04'49", long 66°22'32». 1.80 Hydrologic unit 21010004. (4.67) Barrio San Idelfonso, at Hwy 150, 1.3 mi (2.1 km) west from Coamo Plaza. 397 DRAINAGE AREA mi» (km') 52.4 (136) DATE 3/13/90 4/09/90 TIME 1250 1400 STREAM FLOWS ft'/s (m'/s) 0.00 0.00 3/13/90 4/10/90 3/13/90 4/09/90 3/14/90 4/11/90 3/14/90 4/11/90 1215 1350 1240 1420 1140 1030 1210 1100 0.00 0.00 0.00 0.00 9.05 (23.4) 4.33 (11.2) 18.1 (46.8) 3/13/90 4/10/90 3/13/90 4/10/90 3/13/90 4/10/90 0820 0900 1110 1150 1030 1115 5 (0 3 (0 3 (0 0 (0 2 (0 0 (0 .69 .161) .77 .107) .66 .104) .72 .020) .40 .068) .56 .016) 7.12 (18.4) 43.5 (113) 3/13/90 4/10/90 3/13/90 4/10/90 0950 1040 0910 1030 0.44 (0.012) 0.25 (0.007) 5.72 (0.162) 4.53 (0.128) 0.05 (0.001) 0.04 (0.001) 0.07 (0.002) 0.05 (0.001) 398 STATION NUMBER 50106700 DISCHARGE AT PARTIAL-RECORD STATIONS 50106820 50107000 50107800 50108200 50108500 STATION NAME Rio de La Mina at Coamo, PR Rio Coamo at Bafios de Coamo, PR Rio Coamo near Santa Isabel, PR Rio Descalabrado near Sanja Blanca, PR Rio Descalabrado at Las Ollas, PR Rio Descalabrado near Santa Isabel, PR 50109000 50109500 Rio Canas near Juana Diaz, PR Rio Cafias near Santa Isabel, PR 50110550 Rio Jacaguas at Villalba, PR 50110700 Rio Toa Vaca at Pedro Garcia, PR Low-flow partial-record stations—Continued LOCATION AND BASIN DRAINAGE AREA mi* (km») DATE Lat 18°03'56", long 66°22'29". 5.88 3/14/90 Hydrologic unit 21010004. (15.2) Barrio San Idelfonso, at Hwy 14, 0.2 mi (0.3 km) upstream 4/11/90 from confluence with Rio Coamo, and 1.7 mi (2.7 km) from Coamo Plaza. Lat 18°02'23", long 66°22'31". 58.5 3/14/90 Hydrologic unit 21010004. (152) Barrio San Idelfonso, at the end of Hwy 546, 3.3 mi (5.3 km) 4/10/90 southwest from Coamo Plaza. Lat 17°58'36", long 66°25'10". 69.3 3/13/90 Hydrologic unit 21010004. At (179) bridge on Hwy 1 at Velazquez, 1.1 mi (1.8 km) northwest of 4/10/90 Santa Isabel Plaza. Rio Descalabrado basin Lat 18°05'24", long 66°24'30". 4.27 3/14/90 Hydrologic unit 21010004. (11.0) Barrio Santa Catalina, at Hwy 150, 2.0 mi (3.2 km) southeast 4/11/90 from Lago Toa Vaca, and 3.4 mi (5.5 km) northwest from Coamo Plaza. Lat 18°02'10", long 66°25'36". 13.9 3/14/90 Hydrologic unit 21010004. (36.0) Barrio Descalabrado, at Hwy 536, 0.6 mi (1.0 km) upstream 4/11/90 from Hwy 52, and 2.2 mi (3.5 km) northwest from Cerro del Muerto. Lat 17°58'45", long 66°26'35". 18.1 3/13/90 Hydrologic unit 21010004. At (46.9) bridge on Hwy 1, 0.9 mi (1.4 km) upstream from mouth, and 4/10/90 3.1 mi (5.0 km) northwest of Santa Isabel. Rio Cafias basin Lat 18°02'41", long 66°27'26". 2.88 3/14/90 Hydrologic unit 21010004. (7.47) Barrio Rio Cafias Arriba, at Hwy 14, 3.3 east from Juana 4/11/90 Diaz Plaza. Lat 17°59'39", long 66°28'33". 6.38 3/13/90 Hydrologic unit 21010004. At (16.5) bridge on Hwy 1, 0.5 mi (0.8 km) from mouth, 0.6 mi (1.0 4/10/90 km) east of Pastille, and 5.1 mi (8.2 km) northwest of Santa Isabel Plaza. Rio Jacaguas basin Lat 18°07'37", long 66°29'42". 12.2 3/16/90 Hydrologic unit 21010004. (31.7) Barrio Hato Puerco Arriba, upstream from Water Treatment 4/12/90 Plant, 100 ft (30 m) downstream from confluence with Quebrada Achiote, 0.2 mi (0.3 km) south- west from Villalba. Lat 18°08'11", long 66°23'47". 3.09 3/20/90 Hydrologic unit 21010004. (8.00) Barrio Pedro Garcia, 2.1 mi (3.4 km) southeast from inter- 4/12/90 section of Hwy's 143 and 155, and 4.1 mi (6.6 km) northeast Lago Toa Vaca. TIME 0930 0845 0840 1230 1300 1410 1100 1000 1000 0915 1310 1420 1015 0930 1320 1435 1250 1230 1330 1325 STREAM FLOWS ft'/s (mVs) 0.17 (0.005) 0.08 (0.002) 9.17 (0.260) 4.52 (0.128) 0.00 0.00 0.22 (0.006) 0.04 (0.001) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 29.3 (0.830) 37.0 (1.05) 0.10 (0.003) 0.07 (0.002) DISCHARGE AT PARTIAL-RECORD STATIONS STATION NUMBER 50110900 50111720 50112400 50112700 STATION NAME Rio Toa Vaca upstream from Lago Toa Vaca, PR Quebrada Guanabana near Juana Diaz, PR Rio Inabon at Real Anon, PR Rio Quayo near Collores, PR 50112750 Quebrada Indalecia at Collores, PR 50112800 Rio Guayo upstream from Diversion at Collores, PR 50113790 50113800 50114150 Rio San Patricio upstream from Lago Cerrillos, PR Rio Cerrillos upstream from Lago Cerrillos, PR Quebrada Ausubo near Ponce, PR DRAINAGE AREA mi a (km 1 ) 6.00 (15.4) 1.67 (4.34) 3.52 (9.11) Low-flow partial-record stations--Continued LOCATION AND BASIN Lat 18°07'36", long 66°27'25". Hydrologic unit 21010004. Barrio Caonillas Arriba, at Hwy 553, 0.5 mi (0.8 km) upstream Lago Toa Vaca, and 2.4 mi (3.9 km) east from Villalba. Lat 18°03'12", long 66°29'02". Hydrologic unit 21010004. Barrio Tijeras, at Hwy 14, 1.5 mi (2.4 km) east from Juana Diaz Plza. Rio Inabon basin Lat 18°07'22", long 66°34'20". Hydrologic unit 21010004. Barrio Anon, at Hwy 511, 1.0 mi (1.6 km) northeast from Cerro Santo Domingo, and 4.5 mi (7.2 km) northwest from Lago Guayabal. Lat 18°07'24", long 66°33'27". Hydrologic unit 21010004. Barrio Collores, at Hwy 5.17 about 400 ft (122 m) west from escuela Guaraguao 0.9 mi (1.4 km) northwest from inter- section of Hwy's 517 and 5.12, and 3.5 mi (5.6 km) northwest from Lago Toa Vaca. Lat 18°06'33", long 66°32'20". Hydrologic unit 21010004. Barrio Collores, 200 ft (61 m) upstream from conflu- ence with Rio Guayo, 0.9 mi (1.4 km) northeast from Cerro Aguetinillo, and 2.2 mi (3.5 km) northwest from Lago Guayabal. Lat 18°05'10", long 66°32'24". Hydrologic unit 21010004. Barrio Collores, 2 .1 mi (3.4 km) southwest from Lago Guayabal, and 3.1 mi (5.0 km) northwest from Juana Diaz Plaza. Rio Bucana basin Lat 18°07'12", long 66°36'27". Hydrologic unit 21010004. Barrio Maraguez, 1.5 mi (2.4 km) north- west from Cerro Santo Domingo, 3.6 mi (5.8 km) northwest from Lago Cerrillos, and 7.3 mi from (12 km) Degetau Plaza, Ponce. Lat 18°07<01", long 66°36'17". Hydrologic unit 21010004. At barrio Maraguez, 1.3 mi (2.1 km) west from Cerro Santo Domingo, 3.3 mi (5.3 km) northwest from Lago Cerrillos, and 7.2 mi (12 km) from Degetau Plaza, Ponce. Lat 18°03'09", long 66°35'08". Hydrologic unit 21010004. At Barrio Machuelo Arriba, 2.4 mi (3.9 km) west from Coto Laurel, 1.5 mi (2.4 km) south from Lago Cerrillos, and 3.8 mi (6.1 km) northeast from Degetau Plaza, Ponce. 9.55 (24.7) 5.84 (15.1) 11.9 (30.7) 1.18 (3.05) TIME 3/15/90 4/11/90 3/14/90 4/11/90 3/14/90 4/11/90 3/14/90 4/11/90 3/20/90 4/10/90 3/13/90 4/10/90 3/12/90 4/10/90 0915 0900 0815 1025 0920 1105 0945 1120 0855 0935 1130 1050 1130 1400 399 STREAM FLOWS ftVs (mVs) 14.2 36.8) 1.72 (4.46) 3/21/90 4/12/90 3/13/90 3/14/90 4/11/90 1230 1150 1410 1030 1210 1.48 (0.042) 0.91 (0.026) 0.00 0.00 0.00 2.56 (0.072) 1.21 (0.034) 0.75 (0.021) 0.28 (0.008) 0.00 0.00 1.32 (0.037) 0.64 (0.018) 2.91 (0.082) 1.83 (0.052) 5.02 (0.142) 4.06 (0.115) 0.00 0.00 400 DISCHARGE AT PARTIAL-RECORD STATIONS STATION NUMBER 50114200 STATION NAME Rio Bayagan near Ponce, PR 50114600 Rio Bucana at Ponce, PR 50114900 50115400 Rio Portugues near Tibes, PR Rio Portugues near Ponce, PR 50115450 Rio Chiquito at Portugues, PR 50115600 Rio Chiquito near Ponce, PR 50116500 50116800 50116970 Rio Portugues at Hwy 2 By-Pass at Ponce, PR Rio Canas at Hagueyes PR Rio Canas downstream from Las Americas Ave., PR Low-flow partial-record stations—Continued LOCATION AND BASIN DRAINAGE AREA (km») Lat 18°02'51", long 66°35'12". 3.82 Hydrologic unit 21010004. At (9.88) Barrio Machuelo Arriba, 2.5 mi (4.0 Km) west of Coto Laurel, 1.9 mi (3.0 km) south from Lago Cerrillos, and 3.0 mi (4.8 km) northeast from Degetau Plaza, Ponce. Lat 18°00'28", long 66°35'36". 27.3 Hydrologic unit 21010004. At (70.7) bridge on Hwy 1, 0.2 mi (0.3 km) east of intersection of Hwys 1 and 2, 1.5 mi (2.4 km) east of Degetau Plaza in Ponce, 3.1 mi (5.0 km) upstream from mouth. Rio Portugues basin Lat 18°04'26", long 66°38'35". 7.27 Hydrologic unit 21010004. At (18.8) barrio Tibes, 0.5 mi (0.8 km) southwest from Cerro del Diablo, 6.0 mi (9.6 km) northeast from Penuelas, and 6.2 mi (10 km) north from Ponce. Lat 18°02'27", long 66°36'41". 12.2 Hydrologic unit 21010004. At (31.6) barrio Portugues, 1.0 mi (1.6 km) west from Jardines de Ponce, 0.4 mi (0.6 km) north from confluence with Rio Chi- quito, and 1.9 mi (3.0 km) north from Degetau Plaza, Ponce. Lat 18°04'11", long 66°37'00". 3.12 Hydrologic unit 21010004. At (8.09) barrio Portugues, 2.1 mi (3.4 km) northwest from Jardines de Ponce, 1.7 mi (2.7 km) southwest from Pico Pinto, and 2.8 mi (4.5 km) north from Degetau Plaza, Ponce. Lat 18°02'37", long 66°36'31'. 4.43 Hydrologic unit 21010004. At (11.5) barrio Portugues, 0.6 mi (1.0 km) west from Jardines de Ponce, 0.8 mi (1.3 km) South from Cerro El Gato, and 2.1 mi (3.4 km) north from Degetau Plaza, Ponce. Lat 17°59'52", long 66°36'52". 20.5 Hydrologic unit 21010004. At (53.1) bridge on Hwy 2 By-Pass, 1.1 mi (1.8 km) south of Degetau Plaza, and 2.0 mi (3.2 km) upstream from mouth. Rio Matilde basin Lat 18°04'26", long 66°39'07". 4.00 Hydrologic unit 21010004. At (10.3) barrio Magueyes, 2.4 mi (3.9 km) southwest from Cerro del Diablo, 4.7 mi (7.6 km) northwest from Penuelas, and (6.4 km) northwest from Ponce. Lat 18°00'37", long 66°38'26". 8.50 Hydrologic unit 21010004. 0.5 (22.0) mi (0.8 km) upstream from con- fluence with Rio Pastillo. DATE 3/12/90 4/10/90 3/16/90 4/10/90 3/13/90 4/09/90 3/13/90 4/09/90 3/13/90 4/09/90 3/13/90 4/09/90 3/12/90 4/09/90 3/12/90 4/09/90 3/12/90 4/09/90 TIME 1125 1405 0730 1425 0910 1120 1030 1315 1140 1235 1210 1045 1045 1025 measured STREAM FLOWS ftVs (mVs) 0.00 0.00 1.26 (0.036) 0.06 (0.002) 2.94 (0.083) 3.61 (0.102) 1.59 (0.045) 2.45 (0.069) 0.15 (0.004) 0.09 (0.002) 0.09 (0.002) 0.00 0805 0825 0935 0940 1.53 (0.043) 1.19 (0.034) 4.77 (0.135) 5.98 (0.169) DISCHARGE AT PARTIAL-RECORD STATIONS 401 STATION NUMBER 50117800 STATION NAME Rio Pastillo at Pastillo, PR Low-flow partial-record stations--Continued LOCATION AND BASIN DRAINAGE AREA mi' (km') 50118300 50119000 50119200 50120550 50120700 50121000 50122000 Rio Pastillo near Ponce, PR Rio Matilde at Ponce, PR Quebrada del Agua at Playa de Ponce, PR Rio Tallaboa near Quebrada Ceiba, PR Rio Guayanes near Pefiuelas, PR Rio Tallaboa at Pefiuelas, PR Rio Tallaboa at Tallaboa, PR 50122500 50122900 Rio Macana near Pefiuelas, PR Rio Macana at Magas Arriba, PR Lat 18°02'53", long 66°39'52". 4.32 Hydrologic unit 21010004. (11.2) Barrio Quebrada Limon at Hwy 502, 0.8 mi (1.3 km) northwest of Hwy's 502 and 132 inter- section, 0.9 mi (1.4 km ) west of Magueyes and 3.1 mi (5.0 km) northwest from Ponce. Lat 18<>00'31», long 66°38'39". 10.6 Hydrologic unit 21010004. (27.6) Canas Drbano, on bridge, 0.7 mi (1.1 km) downstream from Jardines del Caribe and 1.1 mi (1.7 km) west of Bscuela Dr. Pila, Ponce. Lat 17°59'53", long 66°38'06 M . 20.5 Hydrologic unit 21010004. At (53.2) Hwy 2, 1.1 mi (1.8 km) upstream from mouth. Lat 17°59'13", long 66°38'22". 6.45 Hydrologic unit 21010004. 700 (16.7) ft (213 m) upstream from con- fluence with Rio Matilde. Rio Tallaboa basin Lat 18°04'18", long 66°42'03". 8.41 Hydrologic unit 21010004. (21.8) Barrio Quebrada Ceiba, on bridge, 0.06 mi (0.1 km) west from Hwy 391, 1.2 mi (2.0 km) north from Tallaboa Alta and 1.7 mi (2.7 km) northeast from Pefiuelas Plaza. Lat 18°04'03", long 66°43'36". 7.29 Hydrologic unit 21010004. (18.9) Barrio Jaguas, on Hwy 386, 0.2 mi (0.4 km) northeast from Hwy's 386 and 132 intersection, 0.6 mi (1.0 km) northeast from Pefiuelas Plaza. Lat 18°03'02", long 66°43'19". 24.2 Hydrologic unit 21010004. 350 (62.7) ft (106.7 m) downstream from Hwy 132 bridge, 0.6 mi (1.0 km) south of Pefiuelas. Lat 18°00'31", long 66°43'49". 31.6 Hydrologic unit 21010004. At (81.7) bridge at Hacienda Dolores, 700 ft (213 m) upstream from Hwy 127, 0.8 mi (1.3 km) north- west of Tallaboa, and 7.6 mi (12.2 km) west of Degetau Plaza, Ponce. Rio Macana basin Lat 18°03'40", long 66<>46'12". 2.77 Hydrologic unit 21010004. (7.17) Barrio Macana at Hwy's 131 and 132 intersection, 5.5 mi (8.8 km) northeast from Yauco, and 2.8 (4.5 km) northeast from Guayanilla Plaza. Lat 18°01'00", long 66°45'57». 8.98 Hydrologic unit 21010004. 1.8 (23.2) mi (2.8 km) east of Guayanilla Plaza, 200 ft (60 m) upstream from bridge on Hwy 2, and 0.6 mi (1.0 km) upstream from mouth. DATE 3/12/90 4/13/90 3/12/90 4/13/90 3/12/90 4/13/90 3/12/90 4/13/90 3/12/90 4/13/90 3/12/90 4/13/90 3/12/90 4/13/90 3/12/90 4/13/90 3/13/90 4/14/90 3/13/90 4/14/90 TIME 0940 1320 0915 1300 0825 1205 1315 1155 1055 1425 1305 0955 1140 0850 1410 1055 0935 0925 0745 0900 STREAM FLOWS ftVs (mVs) 0.26 (0.007) 0.07 (0.002) 0.00 0.00 6.24 (0.177) 3.57 (0.101) 0.00 0.00 3.13 (0.089) 2.51 (0.071) 1.15 (0.032) 0.94 (0.027) 5.03 (0.142) 3.58 (0.101) 3.65 (0.103) 2.75 (0.078) 0.26 (0.007) 0.25 (0.007) 0.00 0.00 402 STATION NUMBER 50123100 STATION NAME Rio Guayanilla at Pasto, PR 50124600 Rio Guayanilla near Central Rufina, PR DISCHARGE AT PARTIAL-RECORD STATIONS Low-flow partial-record stations—Continued LOCATION AND BASIN DRAINAGE AREA mi' (km>) Rio Guayanilla basin Lat 18°05'53", long 66°47'38". 6.45 Hydrologic unit 21010004. At (16.7) barrio Pasto, 1.8 mi (2.9 km) southeast from Pico Rodadero, 1.8 mi (2.9 km) west from Cerro El Peligro, and 5.2 mi (8.4 km) north from Guayanilla Plaza. Lat 18°01'00", long 66°47'01". 23.0 Hydrologic unit 21010004. At (59.5) Guayanilla, 1.2 mi (1.9 km) upstream from mouth, 0.8 mi (1.3 km) northeast from Central Rufina, and 0.6 mi (1.0 km) southeast from Guayanilla Plaza. DATE 3/13/90 4/14/90 3/13/90 4/14/90 TIME 1040 1010 0840 0820 STREAM FLOWS ftVs (mVs) 2.88 (0.082) 2.11 (0.066) 0.18 (0.005) 0.04 (0.001) 50125000 Rio Yauco near Lago Lucchetti Damsite, PR 50125500 Rio Naranjo near Lago Lucchetti Damsite, PR 50125600 Quebrada Grande near Lago Lucchetti Damsite, PR 50125860 Rio Duey at Duey, PR 50128450 50128500 Quebrada Grande upstream from Lago Loco, PR Rio Loco upstream from Lago Loco, PR 50129200 Quebrada Susua at Palomas, PR Rio Yauco basin Lat 18°06'40", long 66°52'38". 8.05 3/13/90 1250 2.78 Hydrologic unit 21010004. (20.8) (0.079) Barrio Vegas, 300 ft (91 m) from mouth, 1.5 mi (2.4 km) 4/14/90 1310 1.52 northwest from spillway, and (0.043) 5.4 mi (8.7 km) northwest from Yauco Plaza. Lat 18°06'20", long 66°51'37". 1.92 3/13/90 1150 0.10 Hydrologic unit 21010004. (4.97) (0.003) Barrio Naranjo at Hwy 128, 0.3 mi (0.5 km) from mouth and 0.9 4/14/90 1240 0.09 mi (1.4 km) from spillway. (0.002) Lat 18°06'20", long 66°50'56". 2.83 3/13/90 1420 0.39 Hydrologic unit 21010004. (7.33) (0.011) Barrio Naranjo, 0.6 mi (1.0 km) west from Hacienda Roig, 0.9 mi 4/14/90 1205 0.41 (1.4 km) from mouth, and 1.3 mi (0.012) (2.1 km) from spillway. Lat 18°05'44", long 66°50'06". 4.55 3/14/90 1040 2.81 Hydrologic unit 21010004. (11.8) (0.080) Barrio Duey, 0.8 mi (1.3 km) southeast from Hacienda Roig, 4/14/90 1120 1.91 1.2 mi (1.9 km) east from Lago (0.054) Lucchetti, and 4.1 mi (6.6 km) from Yauco Plaza. Rio Loco basin Lat 18°03'45", long 66°53'10". 2.72 3/15/90 1020 0.53 Hydrologic unit 21010004. (7.03) (0.015) Barrio Almacigo Alto, 800 ft (244 m) upstream from confluene with Rio Loco, 1.2 mi (1.9 km) 4/16/90 0920 0.29 north from spillway, and 3.0 mi (0.008) (4.8 km) northwest from Yauco Plaza. Lat 18°03'22", long 66°53'08". 7.66 3/15/90 0915 0.89 Hydrologic unit 21010004. At (19.8) (0.025) barrio Susua Alta, 0.2 mi (0.3 km) upstream from Lago 4/16/90 0850 0.17 Loco, 1.9 mi (3.0 km) north- (0.005) east from Cerro La Torre, and 5.2 mi (8.4 km) southeast from Sabana Grande Plaza. Lat 18°01'19", long 66°52'28". 3.23 3/15/90 0725 0.25 Hydrologic unit 21010004. At (8.37) (0.007) bridge on Hwy 2, 0.5 mi (0.8 km) north of Palomas, and 1.9 4/15/90 1220 0.16 mi (3.1 km) southwest of Yauco. (0.004) STATION NUMBER 50130400 STATION NAME Rio Grande near Sabana Grande, PR 50130500 Rio Guanajibo at La Pica, PR 50130800 Rio Flores near Sabana Grande,PR 50131010 50131800 50132010 50133000 50133800 Rio Cruces near Sabana Grande, PR Rio Cupeyes near San German, PR Rio Guanajibo below San German, PR Rio Cain near San German, PR Rio Duey near Rosario, PR 50134600 Rio Hoconuco near San German, PR 50135000 Rio Hoconuco (Duey) near San German, PR DISCHARGE AT PARTIAL-RECORD STATIONS Low-flow partial-record stations—Continued LOCATION AND BASIN DRAINAGE AREA (km') Rio Guanajibo basin Lat 18°05'53", long 66°56'18". 6.45 Hydrologic unit 21010003. (16.7) Barrio Rin at Hwy 364, 0.5 mi (0.8 km) northeast from Capilla del Pozo de la Virgen, and 1.8 mi (2.9 km) northeast from Sabana Grande Plaza. Lat 18°04'11", long 66°57'29". 14.7 Hydrologic unit 21010003. (38.2) Barrio Rayo at Hwy 2, 1.0 mi (1.6 km) north from Cerro de de los Bonelli, and 0.8 mi (1.3 km) southeast from Sabana Grande Plaza. Lat 18°04'02", long 66°58'25". 1.98 Hydrologic unit 21010003. (5.13) Barrio Santana at Hwy 2, 0.2 mi (0.3 km) east from Hwy's 2 and 363 intersection, and 0.9 mi (1.4 km) west from Sabana Grande Plaza. Lat 18°04'54", long 66°58'37". 4.68 Hydrologic unit 21010003. (12.1) Barrio Santana at Hwy 2, 400 ft (122 m) west from Hwy 2 and 363 intersection, 1.1 mi (1.8 km) west from Sabana Grande Plaza. Lat 18°04'48", long 67°00'24". 4.16 Hydrologic unit 21010003. (10.8) Barrio Guama, 0.2 mi (0.3 km) downstream from Hwy 2, and 2.5 mi (4.0 km) east from San German Plaza. Lat 18°05'28", long 67°02'38". 36.1 Hydrologic unit 21010003. 0.5 (93.5) mi (0.8 km) north of San German Plaza and 1500 ft (457m) downstream from Hwy 360 bridge. Lat 18°06'06", long 67°02'26". 6.32 Hydrologic unit 21010003. (16.4) Barrio Cain, at Hwy 361, 600 ft (183 m) upstream from Hwy 2, and 1.3 mi (2.1 km) north from San German Plaza. Lat 18°08'57", long 67°03'15". 4.17 Hydrologic unit 21010003. (10.8) Barrio Duey Alto, 200 ft (61 m) downstream from Hwy 348, 100 ft (30 m) downstream from conflu- ence with Rio Nueve Pasos, and 2.0 mi (3.2 km) southeast from Rosario Plaza. Lat 18°07'08", long 67°04'27". 5.18 Hydrologic unit 21010003. (13.4) Barrio Hoconuco Bajo, 0.2 mi (0.3 km) downstream from Hwy 358, 200 ft upstream from confluence with Rio Duey, and 3.2 mi (5.1 km) northwest from San German Plaza. Lat 18°07'10", long 67°04'48'. 13.2 Hydrologic unit 21010003. (34.3) Barrio Duey Bajo, 200 ft (61 m) downstream from Hwy 2, and 3.4 mi (5.5 km) northwest from San German Plaza.. TIME 3/12/90 4/09/90 3/12/90 4/09/90 3/12/90 4/09/90 3/12/90 4/09/90 3/14/90 4/09/90 3/16/90 4/09/90 3/14/90 4/09/90 3/14/90 4/10/90 3/14/90 4/10/10 3/14/90 4/10/90 0855 0950 0935 1020 1025 1140 0815 0825 1240 0925 1335 403 STREAM FLOWS ftVs (mVs) 0.00 0.62 (0.018) 0.35 (0.010) 0.00 0.00 1.03 (0.029) 0.89 (0.025) 2.67 (0.076) 1.84 (0.052) 12.5 (0.354) 5.52 (0.156) 2.91 (0.082) 0.32 (0.009) 2.91 (0.082) 1.43 (0.040) not measured 0945 1240 1020 0.66 (0.019) 6.73 (0.190) 2.29 (0.065) 404 STATION NUMBER 50135700 50135800 50136400 50136500 50137800 STATION NAME Rio Maricao at Maricao, PR Rio Rosario at Las Vegas, PR Rio Rosario near Hormigueros, PR Rio Rosario at Hwy 2 near Hormigueros, PR Rio Viejo near Cabo Rojo, PR 50138100 Quebrada Maga near Guanajibo, PR 50138200 Rio Hondo near Guanajibo, PR 50138300 Quebrada Sabalos near Mayaguez, PR 50138900 Rio Yagues at Balboa, PR DISCHARGE AT PARTIAL-RECORD STATIONS Low-flow partial-record stations — Continued LOCATION AND BASIN DRAINAGE AREA mi' (km') Lat 18°11'22", long 66°59'37". 3.80 Hydrologic unit 21010003. (9.85) Barrio Maricao Afuera, at Hwy 357, 0.4 mi (0.6 km) east from Hacienda San Antonio, and 1.0 mi (1.6 km) northwest from Maricao Plaza. Lat 18°11'13", long 67°01'52". 8.33 Hydrologic unit 21010003. (21.6) Barrio Montoso, at Hwy 119, 0.1 mi (0.2 km) southeast from intersection with Hwy 105, and 3.6 (5.8 km) northeast from Rosario Plaza. Lat 18°09'36", long 67°05'08". 18.3 Hydrologic unit 21010003. At (47.4) Bridge on Hwy 348, 0.5 mi (0.8 km) Southwest of Rosario Plaza. Lat 18°07'35", long 67°05'39". 22.8 Hydrologic unit 21010003. (58.9) Barrio Benavente, at Hwy 2, 2.7 mi (4.3 km) southwest from Rosario, and 2.5 mi (4.0 km) southeast from Hormigueros Plaza. Lat 18°06'04", long 67°07'48". 12.3 Hydrologic unit 21010003. (31.9) Barrio Bajura, at Hwy 103, 1.0 mi (1.6 km) northeast from intersection with Hwy 102, and 1.4 mi (2.2 km) from Cabo Rojo Plaza. Quebrada Maga basin Lat 18°09'18", long 67°08'07" 0.76 Hydrologic unit 21010003. (1.96) Barrio Guanajibo, 0.3 mi (0.5 km) southeast from Mayaguez Mall, and 1.2 mi (1.9 km) northwest from Hormigueros Plaza. Rio Hondo basin Lat 18°09'45", long 67°09'00". 3.16 Hydrologic unit 21010003. (8.18) Barrio Guanajibo, at Hwy 114, 1.8 mi (2.9 km) east from Cerro Cornelia, and 2.0 mi (3.2 km) northwest from Hormigueros Plaza. Quebrada Sabalos basin Lat 18°10'47", long 67°08'58". 2.47 Hydrologic unit 21010003. (6.40) Barrio Sabalos, at Hwy 2R, 2.9 mi (4.7 km) northwest from Hormigueros, and 1.7 mi (2.7 km) southwest from Mayaguez Plaza. Rio Yagues basin Lat 18°12'13", long 67°07'55". 12.2 Hydrologic unit 21010003. 1200 (31.6) ft (366 m) upstream from bridge on Balboa St. and 1.6 mi (2.6 km) upstream from mouth. DATE 3/14/90 4/10/90 3/14/90 4/10/90 3/12/90 4/10/90 3/14/90 4/10/90 3/13/90 4/11/90 3/13/90 4/11/90 3/13/90 4/11/90 3/13/90 4/11/90 3/13/90 4/11/90 TIME 0715 1320 1210 1240 1345 0815 1140 STREAM FLOWS ftVs (mVs) 4.01 (0.114) 2.89 (0.082) 11.7 (0.331) 6.46 (0.183) 15.1 (0.428) 12.5 (0.354) 12.8 (0.362) 11.2 (0.317) not measured 0745 1445 1025 0845 1100 0930 1245 1015 3.12 (0.088) 0.00 0.00 0.80 (0.023) 0.29 (0.008) 0.38 (0.011) 0.43 (0.012) 3.45 (0.098) 4.16 (0.118) DISCHARGE AT PARTIAL-RECORD STATIONS STATION STATION NUMBER NAME 50140300 Rio Guilarte near Adjuntas, PR 50140800 Rio Limani near Yahuecas, PR 50141400 Rio Guayo at Guayo, PR 50142000 Rio Blanco at La Torre, PR 50142100 Quebrada de Los Platanos at Marisol, PR 50142300 Rio Prieto at Indiera Alta, PR 50142710 Rio Prieto at Rio Prieto, PR 50142900 Rio Prieto at Pezuela, PR 50143000 Rio Grande de Anasco near Lares, PR 50143104 Rio Lajas near Maricao, PR DRAINAGE AREA mi 2 (km») Low-flow partial-record stations—Continued LOCATION AND BASIN Rio Grande de Afiasco basin Lat 18°10'58", long 66°46'09". 2.62 Hydrologic unit 21010003. (6.78) Barrio Guilarte at Hwy 131, 0.4 mi (0.6 km) southwest from Hwy's 130 and 131 intersection, and 4.3 mi (6.9 km) east from Castafier. Lat 18°12'01", long 66°47'50". Hydrologic unit 21010003. Barrio Yahuecas, 200 ft (61 m) upstream with Rio Guilarte, and 500 ft (152 m) southwest from Hwy's 129 and 135 intersection. Lat 18°10'49", long 66°49'40". Hydrologic unit 21010003. Barrio Guayo at Hwy 131, 1.0 mi (1.6 km) upstream from Lago Guayo, 0.4 mi (0.6 km) southeast from Castaner. Lat 14°18'34", long 66°51'49". Hydrologic unit 21010003. Barrio La Torre, at Hwy 128, 2.7 mi (4.3 km) northwest from Lago Guayo, and 4.5 mi (7.2 km) northwest from Castafier. Lat 18°15'41", long 66°51'22". Hydrologic unit 21010003. Barrio Marisol, at Hwy 128, 0.3 mi (0.5 km) south from Hwy's 128 and 129 intersection. Lat 18°10'07", long 66°51'49". Hydrologic unit 21010003. Barrio Indiera Alta, at Hwy 128, 2.3 mi (3.7 km) southwest from Lago Guayo, and 2.2 mi (3.5 km) southwest from Castaner. Lat 18<>12'06', long 66°53'05". Hydrologic unit 21010003. Barrio Rio Prieto, at Hwy 431, 3.7 mi (5.6 km) west from Lago Guayo, and 6.4 mi (10 km) northeast from Maricao Plaza. Lat 18°15'17", long 66°54'25". Hydrologic unit 21010003. Barrio Pezuela, 400 ft (122 m) upstream from confluence with Rio Grande de Afiasco, and 3.4 mi (5.5 km) southwest from Lares Plaza. Lat 18°15'28", long 66°55'05». 26.3 Hydrologic unit 21010003. At (68.1) bridge on Hwy 124, 0.7 mi (1.1 km) from confluence with Rio Blanco and Rio Prieto, and 3.7 mi (6.0 km) southwest from Lares Plaza. Lat 18°10'54", long 66°57'39". 5.79 Hydroloigc unit 21010003. (15.0) Barrio Indiera Fria, at Hwy 105, 0.3 mi (0.5 km) upstream from confluence with Rio Guaba, 0.7 mi (1.1 km) Maricao Plaza. DATE 3/15/90 4/12/90 3/15/90 4/11/90 5/03/90 3/14/90 4/12/90 1135 1515 405 STREAM FLOWS ft3/s (mVs) 1.61 (0.046) 1.44 (0.041) 7.38 (19.1) 4.15 (10.7) 33.2 (86.0) 0.57 (1.47) 7.47 (19.3) 15.1 (39.0) 26.1 (67.7) 3/15/90 4/12/90 3/15/90 4/12/90 3/15/90 4/13/90 3/15/90 4/13/90 3/15/90 4/13/90 3/15/90 4/12/90 3/15/90 4/11/90 not 1350 0900 1225 1155 1440 1305 1555 0855 1245 1030 ---- 1620 measured 2.64 (0.075) 1.70 (0.048) 1.38 0.039) 4.03 (0.114) 1.73 (0.049) 0.26 (0.007) 0.15 (0.004) 5.43 (0.154) 2.16 (0.061) 0.92 (0.026) 0.65 (0.018) 7.61 (0.216) 5.61 (0.159) 1450 0730 17.2 (0.487) 9.08 (0.257) 8.46 (0.240) 6.36 (0.180) 2.61 (0.074) 406 STATION NUMBER 50143108 50143150 STATION NAME Rio Guaba near Maricao, PR Rio Bucarabones near Las Marias, PR 50143200 Rio Guaba near Las Marias, PR 50143400 Quebrada Las Cafias at Perchas, PR 50143500 Rio MayagQecilla at Las Marias, PR 50143800 Rio Grande de Anasco near Las Marias, PR 50143900 Rio Arenas at Las Marias, PR 50144200 Quebrada Cerro Gordo near Cerro Gordo, PR 50144900 Rio Humata near El Espino, PR 50145000 Rio Grande de Anasco at El Espino, PR DISCHARGE AT PARTIAL-RECORD STATIONS Low-flow partial-record stations—Continued LOCATION AND BASIN DRAINAGE AREA mi* (km') DATE Lat 18°11'02", long 66°57'30". 4.95 3/14/90 0840 Hydrologic unit 21010003. (12.8) Barrio Bucarabones, at Hwy 105, 200 ft (61 m) upstream 4/12/90 ---- from confluence with Rio Lajas, and 1.5 mi (2.4 km) from Maricao Plaza. Lat 18°13'27", long 66°56'41". 9.19 3/14/90 1330 Hydrologic unit 21010003. (23.8) Barrio Bucarabones, 400 ft (122 m) upstream from 4/11/90 confluence with Rio Guaba, and 3.7 mi (5.6 km) northeast from Maricao Plaza. Lat 18<>13'37", long 66°56'33". 25.4 3/14/90 1155 Hydrologic unit 21010003. (65.7) Barrio Cerrote, at Hwy 124, 0.3 mi (0.5 km) downstream from 4/11/90 ---- confluence with Rio Bucarabones, and 3.9 mi (6.3 km) northeast from Maricao Plaza. Lat 18°16'23", long 66°56'36". 3.08 3/15/90 1820 Hydrologic unit 21010003. (7.98) Barrio Perchas No 2, at Hwy 434, 800 ft (244 m) upstream from 4/13/90 1100 confluence with Rio Grande de Annasco, and 3.5 mi (5.6 km) from Las Marias Plaza. Lat 18°14'50", long 66°59'05". 3.30 3/14/90 1035 Hydrologic unit 21010003. (8.54) Barrio Palma Bscrita, at Hwy 124, 2.0 mi (3.2 km) upstream from 4/11/90 confluence with Rio Grande de Anasco, and 0.7 mi (1.1 km) southeast fron Las Marias Plaza. Lat 18°16'41", long 66°58'48". 116 Hydrologic unit 21010003. (299) Barrio Guacio, at Hwy 119, 1.8 mi (2.9 km) northeast from Las Marias Plaza. Lat 18°15'10", long 66°59'57». 2.79 Hydrologic unit 21010003. (7.22) Barrio Maravillas, at Hwy 119, 0.5 mi (0.8 km) southwest from Las Marias Plaza. Lat 18°17'09", long 66°04'09". 2.66 Hydrologic unit 21010003. (6.89) Barrio Corcovada, 600 (183 m) upstream from confluence with Rio Grande de Anasco, and 5.7 mi (9.2 km) from Las Marias, and 4.8 mi (7.7 km) «ast from Anasco Plaza. Lat 18°17'18", long 67°06'24'. 4.86 3/13/90 1130 Hydrologic unit 21010003. (12.6) Barrio Carreras, at Hwy 109, 0.3 mi (0.5 km) upstream from 4/10/90 1115 confluence with Rio Grande de Anasco, and 2.4 mi (3.9 km) east from Anasco Plaza. Lat 18°16'50", long 67°06'46". 108 3/13/90 1025 Hydrologic unit 21010003. (280)-384 Barrio Espino, at Hwy 406, 400 ft (249 m) east from 4/10/90 0931 intersection with Hwy 109, and 1.9 mi (3.1 km) from Anasco Plaza. STREAM PLOWS ft3/s (mVs) 4.42 (0.125) 3.06 (0.087) 0.69 (0.020) 3.88 (0.110) 18.8 (0.532) 14.2 (0.402) 2.50 (0.071) 1.12 (0.032) 1.26 (0.036) 1.46 (0.041) 3/14/90 4/13/90 3/14/90 4/11/90 3/13/90 4/10/90 1615 0820 1440 ——— 1330 1440 71.6 (2.03) 35.6 (1.01) 3.62 (0.102) 2.40 (0.068) 2.09 (0.059) 1.32 (0.037) 2.43 (0.069) 1.61 (0.046) 106 (3.00) 58.0 (1.64) DISCHARGE AT PARTIAL-RECORD STATIONS STATION NUMBER 50145400 STATION NAME Rio Casei near Mayaguez, PR 50146000 Rio Grande de Afiasco at Afiasco Arriba, PR 50146002 50146005 50146075 Rio Cafias at Rio Cafias Arriba, PR Rio Cafias at Rio Cafias Aba jo, PR Rio DagOey near Afiasco, PR 50146200 Rio Grande near Rincon, PR 50146300 50146400 Rio Ingenio at JagQey, PR Rio Ingenio near Aguada, PR 50146600 Rio Culebra near Aguada, PR Low-flow partial-record stations--Continued LOCATION AND BASIN DRAINAGE AREA (km») Lat 18°15'18", long 67°04'48". 8.17 Hydrologic unit 21010003. (21.2) Barrio Leguisamo, at Hwy 108, 4.6 mi (7.4 km) northeast from Mayauez, and 4.5 mi (7.2 km) southeast from MayagOez Plaza. Lat 18°16'31", long 66°07'37". 161 Hydrologic unit 21010003. 0.8 (416) mi (1.2 km) south of Afiasco and 3.0 mi (4.8 km) upstream from mouth. Lat 18°13'37", long 67°04'01". 3.58 Hydrologic unit 21010003. (9.26) Barrio Cafias Arriba, at Hwy 354. 0.2 mi (0.3 km) south from intersection with Hwy 355. and 5.1 mi (8.2 km) from MayagOez Plaza. Lat 18°14'38", long 67°07'17". 11.2 Hydrologic unit, 21010003. (29.1) Barrio Rio Cafias Abajo, at Hwy 108, and 3.1 mi (5.0 km) north- east from Mayaguez Plaza. Lat 18°17'19", long 67°08'08". 1.06 Hydrologic unit 21010003. (2.75) Barrio Carreras, at Hwy 405, 100 ft (30 m) east from intresection with Hwy 404, and 0.5 mi (0.8 m) northeast from MayagQez Plaza. Rio Grande basin Lat 18°22'06", long 67°13'56". 2.83 Hydrologic unit 21010003. At (7.33) bridge on Hwy 115, 1.2 mi (1.9 km) upstream from mouth, and 2.2 mi (3.5 km) northeast of Rincon. Rio Ingenio basin Lat 18°20'36", long 67°11'52". 3.18 Hydrologic unit 21010003. (8.22) Bario JagQey, at unmunbered Hwy, 0.3 mi (0.5 km) from Hwy 411 intersection, and 2.7 mi (4.3 km) southwest from Aguada Plaza. Lat 18°22'48", long 67°12'35". 7.00 Hydrologic unit 21010003. At (18.1) bridge on unimproved road, 0.3 mi (0.5 km) upstream from con- fluence with Rio Culebra, 0.7 mi (1.1 km) upstream from mouth of Rio Guayabo, and 1.4 mi (2.3 km) west of Aguada. Rio Culebra basin Lat 18°22'26", long 67°11'35". 3.75 Hydrologic unit 21010003. At (9.70) bridge on Hwy 411, 0.6 mi (1.0 km) south of Aguada, 1.5 mi (2.4 km) upstream from conflu- ence with Rio Ingenio, and 1.9 mi (3.1 km) upstream from mouth of Rio Guayabo. DATE 3/13/90 4/11/90 3/13/90 4/10/90 3/13/90 4/12/90 3/12/90 4/09/90 3/12/90 4/09/90 3/12/90 4/09/90 3/12/90 4/09/90 TIME 1500 0645 0820 0800 1610 0930 1315 1000 1535 1235 1230 0850 1430 1120 407 STREAM FLOWS ftVs 6.86 (0.194) 5.60 (0.159) 102 (2.89) 28.4 (0.804) 2.41 (0.068) 2.45 (0.069) 3/13/90 4/12/90 3/13/90 4/10/90 1727 ---- 0915 1455 1.99 (0.056) 3.03 (0.086) 0.34 (0.010) 0.11 (0.003) 0.53 (0.015) 0.19 (0.005) 0.92 (0.026) 0.96 (0.027) 0.05 (0.001) 1.20 (0.034) 0.95 (0.027) 0.70 (0.020) 408 DISCHARGE AT CREST-STAGE PARTIAL-RECORD STATIONS The following table contains annual maximum discharge for crest-stage stations. A crest-stage gage is a device which will register the peak stage occurring between inspections of the gage. A stage-discharge relation for each gage is developed from discharge measurements made by indirect measurements of peak flow or by current meter. The date of the maximum discharge is not always certain but is usually determined by comparison with nearby continuous- record stations, weather record, or local inquiry. Only the maximum discharge for each water year is given. Infor- mation on some lower floods may have been obtained, and discharge measurements may have been made for purposes of establishing the stage-discharge relation, but these are not published herein. The years given in the period of rec- ord represent years for which the annual maximum has been determined. Annual maximum discharge at crest-stage partial-record stations during water year 1990 Station number Station name Location Annual maximum Drainage Period Gage Dis- area of Date height charge mi» record ft ftVs (km 1 ) (m) (mVs) 50100600 Quebrada Yeguas near Salinas, PR Rio Salinas Basin Lat 18°01'57", long 66°13'30", Hydrologic Unit 21010004, on right bank, 350 ft (107 m) upstream bridge on Highway 712, 1.4 mi (2.2 km) southwest of La Plena, 1.6 mi (2.6 km) southeast of Camp Santiago and 1.7 mi (2.7 km) northwest of Guayama municipal limit. 2.66 (6.89) 1989-90 <6.88 (< 2.097) <87.5 (<2.478) 409 Water-Quality at Partial-Record Stations in Puerto Rico 410 ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATION Water-quality partial-record stations are particcular sites where chemical-quality, biological and or sediment data are collected systematically over a period of years for use in hydrological analysis. The data are collected usually less than quarterly. WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE TIMB DEPTH AT SAMPLE LOC- ATION, TOTAL (FEET) SPE- CIFIC CON- DUCT- ANCE (US/CM) PH TRANS- PAR- TEMPER- ENCY OXYGEN, (STAND- ATURE (SECCHI ARD WATER DISK) UNITS) (DEC C) (IN) DIS- SOLVED (MG/L) OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) COLI- FORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) RIO GUAJATACA BASIN 50010720 NOV 20. MAR 26. JOL 19. 1989 . . 1990 LAGO 0925 1135 0930 GOAJATACA 1.00 1.00 1.00 NO. 3 NR MOUTH NR 325 310 277 7.60 7.90 7.20 RIO GRANDE DE 50025110 NOV 16. MAR 28. JOL 16. 50039900 NOV 17. MAR 06. JOL 13. 50044400 NOV 15. MAR 22. JOL 11. 50057500 NOV 14. MAR 21. JOL 12. 1989 1990 1989 1990 1989 1990 1989 1990 LAGO 0920 0905 0915 LAGO 0815 0850 0855 LAGO 0825 0910 0850 LAGO 0850 1130 0915 DOS BOCAS 1.00 1.00 1.00 CARITE NO. 1.00 1.00 1.00 QUEBRADILLAS, 28.5 27.5 29.5 ARECIBO BASIN NO. 3 AT WEST BRANCH NR UTUADO, 225 248 231 RIO 3 ON RIO 105 114 111 7. 60 7.90 -- 27.0 27.5 30.0 PR (LAT 84 31 87 PR (LAT 26 37 56 18°22' 8.2 10.7 8.6 18°19' 11.1 11.0 6.5 05 "N LONG 105 134 114 15 "N LONG 138 138 89 066°54'36" K3 106 84 066040'11» 58 40 124 W) W) DE LA PLATA BASIN DE LA PLATA NR CAYEY, 7.50 7.10 7.90 LA PLATA NO. 5 NR MOUTH NR 1.00 1.00 1.00 LOIZA NO. 4 1. 00 1.00 1.00 384 288 351 RIO 8.00 8. 10 -- GRANDE 26.1 23.3 27.5 NARANJITO, PR 26.9 26.3 29.0 DE LOIZA BASIN PR (LAT 34 66 24 18°05' 9.1 8.7 10.4 (LAT 18°19'33" 16 22 24 NR MOUTH NR CAGUAS, PR (LAT 18°16'51 336 294 284 7.30 7.30 -- 28.2 27.2 30.5 19 22 24 14.1 15.2 6.2 "N LONG 8.3 6.2 4.3 04 "N LONG 118 98 138 066°06'03" K5 55 68 W) N LONG 066°12'28"W) 176 188 80 066°00'35 105 78 56 54 28 220 "W) K770 550 K860 K = non-ideal count ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATION 411 WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) LINITY WAT WH TOT FET FIELD MG/L AS CAC03 TOTAL AT 105 DEG. C, SUS- PENDED (MG/L) NITRO- GEN, NITRATE TOTAL (MG/L AS N) NITRO- GEN, NITRITE TOTAL (MG/L AS N) NITRO- GEN, N02+NO3 TOTAL (MG/L AS N) NITRO- GEN, AMMONIA TOTAL (MG/L AS N) NITRO- GEN, ORGANIC TOTAL (MG/L AS N) DATE RIO GUAJATACA BASIN--Continued 50010720 LAGO GUAJATACA NO.3 NR MOUTH NR QUEBRADILLAS,PR (LAT 18°22'05"N LONG 066°54'36"W) 0.38 0.58 RIO GRANDE DE ARECIBO BASIN--Continued 50025110 LAGO DOS BOCAS NO.3 AT WEST BRANCH NR UTUADO,PR (LAT 18°19'15"N LONG 066°40'11"W) NOV 1989 20. .. MAR 1990 26. .. JUL 19. .. K8 K12 20 140 160 110 10 27 0.18 8 <0.01 0.02 <0.01 <0.10 0.20 <0.10 0.02 <0.01 0.02 NOV 1989 16. .. MAR 1990 28. . . JUL 16. . . 48 40 45 73 92 88 5 0 <1 0, <1 0 .78 .38 .09 0. 0. 0. .02 ,02 .01 0. 0. 0. ,80 .40 .10 0, 0. 0. .01 ,03 .07 0.29 0.37 0.33 RIO DE LA PLATA BASIN--Continued 50039900 LAGO CARITE NO.3 ON RIO DE LA PLATA NR CAYEY,PR (LAT 18°05'04"N LONG 066°06'03"W) 0.81 50044400 LAGO LA PLATA NO.5 NR MOUTH NR NARANJITO, PR (LAT 18°19'33"N LONG 066°12'28"W) 0.39 NOV 1989 17. .. MAR 1990 06. . . JUL 13. .. Kl K18 45 30 38 36 8 6 13 0.18 <0.01 <0.01 0.02 <0.10 0.20 0.20 <0.01 0.09 <0.01 NOV 1989 15. .. MAR 1990 22. .. JUL 11. . . 36 K15 45 148 100 130 9 12 18 0.38 0.86 -- 0.02 0.04 <0.01 0.40 0.90 <0.10 0.01 <0.01 <0.01 RIO GRANDE DE LOIZA BASIN--Continued 50057500 LAGO LOIZA NO.4 NR MOUTH NR CAGUAS, PR (LAT 18°16'51"N LONG 066°00'35"W) NOV 1989 14. . . MAR 1990 21. .. JUL 12. .. 92 54 80 100 85 89 <1 26 8 0.49 0.59 0.28 0.11 0.11 0.12 0.60 0.70 0.40 0.43 1.3 1.3 0.67 0.0 0.80 412 ANALYSES OP SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATION WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 NITRO- CHLOR-A CHLOR-B GEN,AM- PHYTO- PHYTO- MONIA -f NITRO- NITRO- PROS- PLANK- PLANK- PLANK- PLANK- ORGANIC GEN, GEN, PHORUS TON TON TON TON TOTAL TOTAL TOTAL TOTAL CHROMO CHROMO BIOMASS BIOMASS DATE (MG/L (MG/L (MG/L (MG/L FLUOROM FLUOROM ASH WT DRY WT AS N) AS N) AS N03) AS P) (UG/L) (UG/L) (MG/L) (MG/L) RIO GUAJATACA BASIN--Continued 50010720 LAGO GUAJATACA NO.3 NR MOUTH NR QUEBRADILLAS,PR (LAT 18°22'05"N LONG 066°54'36"W) NOV 1989 20... 0.40 -- -- 0.03 9.9 1.5 1.9 250 MAR 1990 26... 0.50 0.70 3.1 0.03 8.9 0.80 8.4 260 JUL 19... 0.60 -- -- 0.07 3.0 0.10 3.0 240 RIO GRANDE DE ARECIBO BASIN--Continued 50025110 LAGO DOS BOCAS NO.3 AT WEST BRANCH NR UTUADO,PR (LAT 18°19'15"N LONG 066°40'11"W) NOV 1989 16. . . MAR 1990 28. . . JUL 16. . . 0.30 0.40 0.40 1. 1 0.80 0.50 4.9 3.5 2.2 0.05 0.03 0.04 20 3.3 3.4 0.70 0.30 0.30 1.2 4.5 3.1 220 250 240 RIO DE LA PLATA BASIN--Continued 50039900 LAGO CARITE NO.3 ON RIO DE LA PLATA NR CAYEY,PR (LAT 18°05'04"N LONG 066°06'03"W) NOV 1989 17. .. MAR 1990 06. . . JUL 13. .. <0.20 0.90 0.40 -- 1.1 0.60 -- 4.9 2.7 0.02 0.02 0.04 8.8 13 17 1.1 2.6 5.9 1.0 5.4 6.1 500 250 250 50044400 LAGO LA PLATA NO.5 NR MOUTH NR NARANJITO, PR (LAT 18°19'33"N LONG 066°12'28"W) NOV 1989 15. . . MAR 1990 22. . . JUL 11. . . 0, 0, 0. ,40 .90 .80 0.80 1.8 -- 3.5 8.0 -- 0, 0, 0, .17 .13 .17 52 18 29 1. 1. 0. ,5 .6 .80 2.4 3.6 6.2 280 240 240 RIO GRANDE DE LOIZA BASIN--Continued 50057500 LAGO LOIZA NO.4 NR MOUTH NR CAGUAS, PR (LAT 18°16'51"N LONG 066°00'35"W) NOV 1989 14. .. MAR 1990 21. . . JUL 12. .. 1.1 0.80 2.1 1.7 1.5 2.5 7.5 6.6 11 0.30 0.47 0.52 35 4.0 4.8 1.1 <0.10 0.30 1.8 2.2 3.0 250 240 250 ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATION WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 413 DATE 50010790 NOV 20. 20. MAR 26. 26. JUL 19. 19. 1989 . . 1990 . . TIME 1000 1005 1220 1215 1015 1020 DEPTH AT SPE- TRANS- SAMPLE CIFIC PAR- LOG- CON- PH TEMPER- ENCY OXYGEN, ATION, DUCT- (STAND- ATURE (SECCHI DIS- TOTAL ANCE ARD WATER DISK) SOLVED (FEET) (US/CM) UNITS) (DEG C) (IN) (MG/L) RIO GUAJATACA BASIN- -Continued LAGO GUAJATACA NO.l NR DAM NR QUEBRADILLAS,PR (LAT 18°23 1. 42. 1. 64. 1. 73. 00 0 00 0 00 0 321 294 335 291 332 266 8.00 7.30 8.00 7.70 7.00 7.40 25.7 98 28.5 27.5 60 25.6 26.4 72 24.5 8.0 1.8 10.5 2.5 8.0 2.5 OXYGEN, COLI- STREP- DIS- FORM, TOCOCCI SOLVED FECAL, FECAL, (PER- 0.7 KF AGAR CENT UM-MF (COLS. SATUR- (COLS./ PER ATION) 100 ML) 100 ML) '56"N LONG 066°55'23"W) 102 23 101 30 97 30 K4 -- 50 -- K5 -- K6 -- K2 -- Kl -- RIO GRANDE DE ARECIBO BASIN--Continued NOV 21. 21. MAR 29. 29. JUL 17. 17. NOV 16. 16. MAR 28. 28. JUL 16. 16. NOV 17. 17. MAR 02. 06. JUL 13. 13. 50020050 1989 1990 50027090 1989 1990 50039950 1989 1990 LAGO GARZAS 0930 0945 0935 0945 1050 1055 1. 80. 1. 60. 1. 45. 00 0 00 0 00 0 NO.l NR DAM 137 153 155 162 158 164 LAGO DOS BOCAS 0950 0945 0950 0940 1015 1030 1. 79. 1. 60. 1. 81. 00 0 00 0 00 0 LAGO CARITE 0845 0840 0940 0950 0935 0925 50044950 NOV 15. 15. MAR 22. 22. JUL 11. 11. 1989 1990 0915 0910 0810 0800 0945 0940 1. 67. 1. 56. 1. 52. LAGO 1. 38. 1. 81. 1. 53. 00 0 00 0 00 0 LA PLATA 00 0 00 0 00 0 208 208 227 206 228 233 7.50 7. 00 7.70 7.90 6.90 6.70 NO.l NR 7.90 7.30 7.70 7.75 7.00 6.70 RIO DE LA NO.l NR DAM 103 171 111 110 114 162 NO 278 180 290 264 323 287 7.40 6. 60 8.10 7.40 8.60 7.20 .3 NR DAM 8.50 7.20 7.80 7.50 6.50 6.50 NR AD JUNTAS, PR 24.0 60 21.5 23.3 58 22.1 26.0 54 22.3 (LAT 18°08'21" 8.6 2.0 7.7 -- 7.9 2.8 DAM NR UTUADO, PR (LAT 18°20'09 26.8 45 24.7 27.5 70 24.8 30.5 54 62.5 9.6 -- 8.1 2.4 6.4 1. 1 N LONG 110 26 96 55 105 37 "N LONG 120 50 102 30 85 14 066°44'35 Kll -- -- -- 40 -- "W) K3 -- -- -- 140 -- 066°40'04"W) 40 -- K5 -- 220 -- K37 -- K8 -- 63 -- PLATA BASIN- -Continued NR CAYEY, P.R. 25.8 42 22.8 23.8 60 22.1 28.0 24 22.5 NR NARANJITO, 27.4 30 24.0 25.3 34 23.6 29.5 84 23.8 (LAT 18°04'39" 8.7 1.5 10.7 1.4 9.9 2.2 N LONG 113 19 132 17 133 30 066°06'19 K4 -- K2 -- -- -- PR (LAT 18°20'18"N LONG 066°14' 10.0 1.2 8.2 2.4 6.2 2.2 126 15 100 29 81 29 K8 -- K24 -- 250— "W) K40 -- K7 -- 64 -- 01"W) 110 -- K38 -- 84 -- RIO GRANDE DE LOIZA BASIN- -Continued 50058800 NOV 14 . 14. MAR 21. 21. JUL 12. 12. 1989 1990 0805 0810 1030 1045 0830 0835 LAGO 1. 32. 1. 36. 1. 20. LOIZA NO 00 0 00 0 00 0 .7 321 324 322 328 283 287 NR DAM NR 7.20 7.00 7.80 7.60 6.1 6.3 TRUJILLO ALTO, 27.5 24 27.4 26.1 34 25.1 30.0 40 29.3 PR (LAT 18°19' 3.6 1.4 11.1 2.4 7.3 2.6 29"N LONG 066°00 45 18 134 29 95 34 K44 -- K230 -- K16 -- '47"W) 68 -- K280 -- K14 -- 414 ANALYSES OP SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATION WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 DATE 50010790 NOV 1989 20.. . 20.. . MAR 1990 26.. . 26.. . JUL 19.. . 19. .. 50020050 NOV 1989 21. . . 21.. . MAR 1990 29. .. 29. . . JUL 17. .. 17. .. 50027090 NOV 1989 16. .. 16. .. MAR 1990 28.. . 28.. . JUL 16.. . 16. .. 50039950 NOV 1989 17.. . 17. .. MAR 1990 02. .. 06. .. JUL 13. .. 13. .. 50044950 NOV 1989 15.. . 15. .. MAR 1990 22. .. 22. . . JUL 11. .. 11. .. HARD- HARD- NESS NESS NONCARB CALCIUM TOTAL WH WAT DIS- (MG/L TOT PLD SOLVED AS MG/L AS (MG/L CAC03) CAC03 AS CA) LA GO GUAJATACA NO.l NR 140 150 160 140 150 130 61 53 65 66 66 66 10 35 14 28 1 0 LAGO 0 0 2 0 0 0 LAGO DOS 70 74 78 92 90 92 6 4 8 6 2 0 50 55 58 51 54 46 GARZAS NO.l 18 15 18 18 18 18 BOCAS NO.l 19 20 21 25 24 25 LAGO CARITE NO.l NR 38 26 31 30 30 39 LAGO 63 98 100 110 110 120 1 0 0 0 0 0 8.6 4.6 6.2 6.1 6.0 8.1 LA PLATA NO. 3 NR 7 1 10 9 5 0 15 23 22 26 24 27 ALKA- MAGNE- SODIUM POTAS- LINITY SIUM, SODIUM, AD- SIUM, WAT WH SULPATE DIS- DIS- SORP- DIS- TOT PET DIS- SOLVED SOLVED TION SOLVED FIELD SOLVED (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L AS MG) AS NA) AS K) CACO3 AS SO4) RIO GUAJATACA BASIN- -Continued DAM NR QUEBRADILLAS,PR (LAT 18°23'56"N LONG 066°55'23"W) 3.7 3.8 4.5 4.2 3.9 3.7 RIO NR DAM 3.8 3.8 4.8 5.0 5.1 5.0 NR DAM 5.5 5.9 6.2 7.2 7.4 5.4 5.6 6.3 6.2 6.2 6.3 GRANDE DE 0.2 0.2 0.2 0.2 0.2 0.2 2.1 2.1 2.4 2.3 2.0 1.9 140 123 140 140 170 120 11 11 9 10 9 13 .3 .4 ARECIBO BASIN- -Continued NR ADJUNTAS,PR (LAT 18° 6.7 5.3 6.3 6.4 6.6 6.5 NR UTUADO, 8.8 10 10 12 12 7.1 10 RIO DE DAM NR 4.0 3.6 3.7 3.6 3.7 4.6 DAM NR 6.2 9.9 10 12 11 13 0.4 0.3 0.3 0.3 0.4 0.3 PR (LAT 18°20 0.5 0.5 0.5 0.5 0.5 0.5 08'21 1.8 1.3 1.1 1.2 1.1 1.3 '09"N 2.4 1.9 2.7 2.5 2.1 2.3 "N LONG 54 57 55 76 79 77 066°44' 3 2 2 2 2 <1 LONG 066°40'04 69 64 86 76 84 97 10 14 9 14 15 9 35" .0 .0 .2 . 8 .5 .0 "W) .6 .7 W) LA PLATA BASIN--Continued CAYEY, P.R 7.8 8. 8 8.6 8.9 9.4 8.7 NARANJITO, 12 16 15 17 15 19 RIO GRANDE DE LOIZA 50058800 NOV 1989 14.. . 14. .. MAR 1990 21. . . 21.. . JUL 12.. . LAGO 99 100 110 100 90 LOIZA 0 1 9 10 2 NO. 7 NR DAM NR TRUJILLO ALTO 23 24 24 24 21 10 9.7 9.8 9.8 9.0 26 26 26 26 25 . (LAT 18°04' 0.6 0.7 0.7 0.7 0.7 0.6 39"N LONG 066°06'19" 1.0 0.70 1.1 0.90 0.90 1.0 30 67 36 33 33 59 PR (LAT 18°20'18 MN LONG 0.7 0.7 0.5 0.7 0.6 0.8 2.9 3.0 2.7 2.7 2.7 1.7 92 57 110 87 100 120 <1 2 2 2 2 <1 W) .0 .0 .1 .7 .6 .0 066°14'01"W) 10 14 13 12 9 15 .4 BASIN- -Continued , PR (LAT 18°19'29 1 1 0.9 1 1 3.3 3.2 3.2 3.0 3.3 "N LONG 100 100 87 90 96 066°00' 18 14 20 19 17 47" W) ANALYSES OP SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATION WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 415 SOLIDS, RESIDUE CHLO- PLUG- SILICA, SUM OP TOTAL NITRO- NITRO- NITRO- NITRO- RIDE, RIDE, DIS- CONSTI- AT 105 GEN, GEN, GEN, GEN, DIS- DIS- SOLVED TUENTS, DEC. C, NITRATE NITRITE NO2+NO3 AMMONIA SOLVED SOLVED (MG/L DIS- SUS- TOTAL TOTAL TOTAL TOTAL DATE (MG/L (MG/L AS SOLVED FENDED (MG/L (MG/L (MG/L (MG/L AS CL) AS P) SIO2) (MG/L) (MG/L) AS N) AS N) AS N) AS N) RIO GUAJATACA BASIN--Continued 50010790 LAGO GUAJATACA NO.1 NR DAM NR QUEBRADILLAS,PR (LAT 18°23'56"N LONG 066°55'23"W) NOV 20. 20. MAR 26. 26. JUL 19. 19. 1989 1990 . . . . •• 7 8 11 11 11 11 .3 0. .6 0. <0 . <0. 0. 0. 20 20 10 10 40 40 7, 7, 7, 5. 7, 4. .5 165 11 . 1 177 .2 189 <1 .8 174 .3 188 8 .6 159 <0.01 __ 0.01 __ <0.01 -- <0 . -- <0. -- <o . -- 10 10 < 10 0.— 0. -- 0. -- 01 01 02 RIO GRANDE DE ARECIBO BASIN- -Continued 50020050 NOV 21. 21. MAR 29. 29. JUL 17. 17. 1989 1990 5 5 7 7 7 7 50027090 NOV 16. 16. MAR 28. 28. JUL 16. 16. 1989 1990 9 9 12 14 12 11 LAGO GARZAS .4 0. .1 0. .4 0. .0 0. .6 <0. .4 <0. LAGO DOS .1 0. .5 0. 0. <0. <0 . 0. 10 10 10 20 10 10 NO.l 19 19 22 22 19 20 NR DAM NR ADJUNTAS.PR (LAT 18°08'21"N 92 1 86 105 7 105 103 <1 -- BOCAS NO.l NR DAM NR UTDADO, 10 10 10 10 10 10 24 25 23 22 21 22 118 3 130 128 <1 149 145 3 144 <0.01 _- <0.01 __ 0.01 -- LONG <0. -- <0 . -- <0. -- PR (LAT 18°20'09"N LONG 0.68 0.02 __ 0.28 0.02 __ <0.01 -- 0. -- 0. -- <o . -- 066°44' 10 10 10 066°40 70 < 30 10 35 0. -- 0. -- 0. -- "W) 01 01 01 '04"W) 0. -- 0. -- 0. -- 01 02 05 RIO DE LA PLATA BASIN- -Continued 50039950 NOV 17. 17. MAR 02. 06. JUL 13. 13. 1989 1990 9 9 9 11 13 13 50044950 NOV 15. 15. MAR 22. 22. JUL 11. 11. 1989 1990 . . 14 16 19 21 21 24 50058800 NOV 14. 14. MAR 21. 21. JUL 12. 12. 1989 . . 1990 44 23 25 21 25 24 LAGO CARITE .5 <0. .0 0. .3 <0. <0. <0. <0. 10 10 10 10 10 10 LAGO LA PLATA 0. 0. 0. <0. <0 . 0. LAGO LOIZA 0. 0. 10 10 30 10 10 50 NO 10 10 0.20 <0. 0. <o . 10 10 10 NO. 1 20 18 17 18 20 18 NO. 3 19 18 21 20 20 21 .7 NR 25 25 26 25 25 26 NR DAM NR CAYEY, P.R 65 2 _- 72 24 67 73 51 -- NR DAM NR NARANJITO, 111 6 156 176 24 -- 167 <1 193 RIO GRANDE DE LOIZA DAM NR TRUJILLO ALTO 210 <1 186 <1 186 178 1 177 . (LAT 18°04'39"N 0.01 __ <0.01 _- 0.08 0.02 -- PR (LAT 18°20'18" 0.29 0.01 __ <0.01 _- <0.01 -- BASIN- -Continued , PR (LAT 18°19'29 0.34 0.06 __ 0.43 0.07 __ 0.13 0.07 __ LONG <0. -- 0. -- 0. — 066°06' 10 - 10 - 10 - 19 0. - 0. - 0. - N LONG 066°14' 0. -- <0 . -- <0. -- 30 < 10 < 10 < 0. -- 0. -- 0.— "N LONG 066° 00 0. -- 0. -- 0. -- 40 50 20 0. -- 0. -- 0. -- "W) 01 05 02 01"W) 01 01 01 '47"W) 14 21 06 416 DATE 50010790 NOV 1989 20. . . 20. .. MAR 1990 26. . . 26. . . JUL 19. .. 19. .. 50020050 NOV 1989 21. .. 21. . . MAR 1990 29. .. 29. .. JUL 17 ... 17. .. 50027090 NOV 1989 16. .. 16. .. MAR 1990 28. . . 28. .. JUL 16. .. 16. .. 50039950 NOV 1989 17. .. 17. .. MAR 1990 02. .. 06. . . JDL 13. .. 13. .. 50044950 NOV 1989 15. .. 15. .. MAR 1990 22. .. 22.. . JDL 11. .. 11. .. 50058800 NOV 1989 14 ... 14.. . MAR 1990 21.. . 21. .. JUL 12. .. 12. .. ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATION WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 NITRO- CHLOR-A CHLOR-B NITRO- GEN,AM- PHYTO- PHYTO- GEN, MONIA + NITRO- NITRO- PHOS- PLANK- PLANK- PLANK- PLANK- ORGANIC ORGANIC GEN, GEN, PHORUS TON TON TON TON TOTAL TOTAL TOTAL TOTAL TOTAL CHROMO CHROMO BIOMASS BIOMASS (MG/L (MG/L (MG/L (MG/L (MG/L FLUOROM FLUOROM ASH WT DRY WT AS N) AS N) AS N) AS NO3) AS P) (UG/L) (UG/L) (MG/L) (MG/L) RIO GUAJATACA BASIN--Continued LAGO GUAJATACA NO.1 NR DAM NR QUEBRADILLAS,PR (LAT 18°23'56"N LONG 066°55'23"W) 0.39 0.40 0.59 0.40 0.78 0.80 0.01 4.1 0.30 0.70 240 0.01 3.5 0.10 4.4 250 0.02 2.9 <0.10 5.7 490 RIO GRANDE DE ARECIBO BASIN--Continued LAGO GARZAS NO.1 NR DAM NR ADJUNTAS,PR (LAT 18°08'21"N LONG 066°44'35"W) 0.29 0.30 0.19 0.20 0.59 0.60 0.02 4.4 0.30 0.70 250 <0.01 1.8 0.30 4.4 250 0.01 2.9 0.10 3.6 240 LAGO DOS BOCAS NO.1 NR DAM NR UTUADO,PR (LAT 18°20'09"N LONG 066°40'04"W) 0.30 1.0 4.4 0.02 12.0 <0.20 1.3 260 0.28 0.30 0.60 2.7 0.02 5.0 0.40 4.0 250 0.15 0.20 -- -- 0.03 4.3 0.30 3.6 240 RIO DE LA PLATA BASIN--Continued LAGO CARITE NO.1 NR DAM NR CAYEY, P.R. (LAT 18°04'39"N LONG 066°06'19"W) 0.29 0.30 -- -- <0.01 10.0 1.2 2.0 510 1.2 1.3 1.4 6.2 0.02 42.0 9.2 18 270 3.2 3.2 3.3 15 0.10 140 63.0 95 350 LAGO LA PLATA NO.3 NR DAM NR NARANJITO, PR (LAT 18°20'18"N LONG 066°14'01"W) 0.60 0.90 4.0 0.03 29.0 3.2 3.8 260 0.90 -- -- 0.07 33.0 5.7 5.1 250 0.40 -- -- 0.03 4.0 0.20 5.1 240 RIO GRANDE DE LOIZA BASIN--Continued LAGO LOIZA NO.7 NR DAM NR TRUJILLO ALTO, PR (LAT 18°19'29"N LONG 066°00'47"W) 0.56 0.70 1.1 4.9 0.19 20.0 1.3 2.3 250 0.29 0.50 1.0 -- 0.19 12.0 0.30 2.6 230 1.1 1.2 1.4 6.2 0.27 18.0 0.40 3.1 210 PESTICIDE ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATIONS WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 417 DATE 50010790 JUL 1990 19. .. 50020050 JTJL 1990 17.. . 50027090 JUL 1990 16.. . 50039950 JUL 1990 13. .. 50044950 JUL 1990 11. .. 50058800 JUL 1990 12. .. CHLOR- DI- DI- ENDO- PCB, ALDRIN, DANE, ODD, DDE, DOT, AZINON, ELDRIN SULFAN, TIME TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) RIO GUAJATACA BASIN--Continued LAGO GUAJATACA NO.l NR DAM NR QUEBRADILLAS,PR (LAT 18°23'56"N LONG 066°55'23"W) 1020 <0.1 <0.010 <0.1 <0.010 <0.010 <0.010 0.01 <0.010 <0.010 RIO GRANDE DE ARECIBO BASIN--Continued LAGO GARZAS NO.l NR DAM NR ADJUNTAS,PR (LAT 18°08'21"N LONG 066°44'35"W) 1055 <0.1 <0.010 <0.1 <0.010 <0.010 <0.010 <0.01 <0.010 <0.010 LAGO DOS BOCAS NO.l NR DAM NR UTUADO,PR (LAT 18°20'09"N LONG 066°40'04"W) 1015 <0.1 <0.010 <0.1 <0.010 <0.010 <0.010 <0.01 <0.010 <0.010 RIO DE LA PLATA BASIN--Continued LAGO CARITE NO.l NR DAM NR CAYEY, P.R. (LAT 18°04'39"N LONG 066°06'19"W) 0935 <0.010 <0.010 <0.010 <0.010 <0.01 <0.010 <0.010 LAGO LA PLATA NO.3 NR DAM NR NARANJITO, P.R. (LAT 18°20'18"N LONG 066°14'01 MW) 0945 <0.1 <0.010 <0.1 <0.010 <0.010 <0.010 <0.01 <0.010 <0.010 RIO GRANDE DE LOIZA BASIN--Continued LAGO LOIZA NO.7 NR DAM NR TRUJILLO ALTO, P.R. (LAT 18°19'29"N LONG 066°00'47"W) 0835 <0.010 <0.010 <0.010 <0.010 0.03 <0.010 <0.010 418 DATE 50010790 PESTICIDE ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATIONS WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 HEPTA- METH- METHYL METHYL HEPTA- CHLOR MALA- OXY- PARA- TRI- ENDRIN, ETHION, CHLOR, EPOXIDE LINDANE THION, CHLOR, THION, THION, MIREX, TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) RIO GUAJATACA BASIN--Continued LAGO GUAJATACA NO.l NR DAM NR QUEBRADILLAS, P.R. (LAT 18°23'56"N LONG 066°55'23 HW) JUL 1990 19... <0.010 <0.01 <0.010 <0.010 <0.010 <0.01 <0.01 <0.01 <0.01 <0.01 RIO GRANDE DE ARECIBO BASIN--Continued 50020050 LAGO GARZAS NO.l NR DAM NR ADJUNTAS, P.R. (LAT 18°08'21"N LONG 066°44'35"W) JUL 1990 17.. . <0.010 <0.01 <0.010 <0.010 <0.010 <0.01 <0.01 <0.01 <0.01 <0.01 LAGO DOS BOCAS NO.l NR DAM NR UTUADO, P.R. (LAT 18°20'09"N LONG 066°40'04"W) <0.010 <0.01 <0.010 <0.010 <0.010 <0.01 <0.01 <0.01 <0.01 <0.01 RIO DE LA PLATA BASIN--Continued 50039950 LAGO CARITE NO.l NR DAM NR CAYEY, P.R. (LAT 18°04'39"N LONG 066°06'19"W) 50027090 JUL 1990 JUL 1990 13. .. 50044950 JUL 1990 11.. . JUL 1990 12. .. <0.010 <0.01 <0.010 <0.010 <0.010 <0.01 <0.01 <0.01 <0.01 <0.01 LAGO LA PLATA NO.3 NR DAM NR NARANJITO, P.R. (LAT 18°20'18»N LONG 066°14'01"W) <0.010 <0.01 <0.010 <0.010 <0.010 <0.01 <0.01 <0.01 <0.01 <0.01 RIO GRANDE DE LOIZA BASIN--Continued 50058800 LAGO LOIZA NO.7 NR DAM NR TRUJILLO ALTO, P.R. (LAT 18°19'29 UN LONG 066°00'47"W) <0.010 <0.01 <0.010 <0.010 <0.010 <0.01 <0.01 <0.01 <0.01 <0.01 PESTICIDE ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATIONS WATER-QUALITY DATA, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 NAPH- THA- LENES, PARA- POLY- PER- TOX- TOTAL THION, CHLOR. THANE APHENE, TRI- 2,4-D, 2,4,5-T 2, 4-DP SILVEX, DATE TOTAL TOTAL TOTAL TOTAL THION TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) 419 50010790 JUL 1990 19.. . 50020050 JUL 1990 17. .. 50027090 JUL 1990 16. .. 50039950 JUL 1990 13. .. 50044950 JUL 1990 11. .. 50058800 JUL 1990 12. .. RIO GUAJATACA BASIN- -Continued LAGO GUAJATACA NO.l NR DAM NR QUEBRADILLAS, P.R. (LAT 18°23'56"N LONG 066°55'23"W) <0.01 <0.10 <0.1 <1 <0.01 <0.01 <0.01 <0.01 <0.01 RIO GRANGE DE ARECIBO BASIN- -Continued LAGO GARZAS NO.l NR DAM NR ADJUNTAS, P.R. (LAT 18°08'21"N LONG 066°44'35"W) <0.01 <0.10 <0.1 <1 <0.01 0.02 <0.01 <0.01 <0.01 LAGO DOS BOCAS NO.l NR DAM NR UTUADO, P.R. (LAT 18°20'09"N LONG 066°40'04"W) <0.01 <0.10 <0.1 <1 <0.01 <0.01 <0.01 <0.01 <0.01 RIO DE LA PLATA BASIN- -Continued LAGO CARITE NO.l NR DAM NR CAYEY, P.R. (LAT 18°04'39"N LONG 066°06'19"W) <0.01 <0.10 <0.1 <1 <0.01 <0.01 <0.01 <0.01 <0.01 LAGO LA PLATA NO. 3 NR DAM NR NARANJITO, P.R. (LAT 18°20'18 MN LONG 066°14'01"W) <0.01 <0.10 <0.1 <1 <0.01 0.02 <0.01 <0.01 <0.01 RIO GRANDE DE LOIZA BASIN- -Continued LAGO LOIZA NO. 7 NR DAM NR TRUJILLO ALTO, P.R. (LAT 18°19'29"N LONG 066°00'47 M W) <0.01 <0.10 cO.l <1 <0.01 0.09 <0.01 <0.01 <0.01 420 THIS PAGE WAS LEFT BLANK INTENTIONALLY 421 Ground-Water Records Puerto Rico 422 GROUND-WATER LEVELS RIO GUAJATACA BASIN 182422067015100. Local number, 165. LOCATION.--Lat 18°24'22", long 67°01'51". Owner: P.R. Aqueduct and Sewer Authority. Name: Saltos # 1 (Mateo Perez). AQUIFER.--Cibao Formation. Aguada Limestone. WELL CHARACTERISTICS.--Drilled production water-table well, diameter 16 in (0.40 m) , cased 16 in (0.40 m) 0-40 ft (0-12.2 m) , cased 12 in (0.30 m) 40-200 ft (12.2-61.0 m) . Depth 200 ft (61.0 m) . DATUM.--Elevation of land-surface datum is 689 ft (210 m) above mean sea level. Measuring point: Hole on pump base, 0.80 ft (0.24 m) above land-surface datum. Prior November 1985, hole on top of pump base, 1.00 ft (0.30 m) above land-surface datum. REMARKS.--Recording observation well. Formerly published as 182421067015000. PERIOD OF RECORD.--January 1982 to March 1985. November 1985 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 38.86 ft (11.8 m) below land-surface datum, Sept. 29-30, 1990; lowest water level measured, 70.60 ft (21.52 m) below land-surface datum, June 18, 1982. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 INSTANTANEOUS OBSERVATION AT 1200 OCT NOV DEC JAN FEB 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 LOW HIGH 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 .55 .52 .50 .47 .50 .53 .48 .45 .45 .47 .47 .45 .46 .39 .37 .36 .34 .36 .42 .54 .46 .41 .36 .34 .42 .39 .38 .34 .32 .53 .74 .74 .32 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 40 .59 .73 .62 .61 .75 .83 .65 .58 .59 .57 .57 .62 .57 .51 .48 .46 .47 .51 .52 .41 .36 .44 .44 .41 .39 .56 .49 .47 .39 .33 --- .83 .33 40. 40. 40. 40. 40. 40. 40. 40. 40. 40. 40. 40. 40. 40. 40. 40, 40, 40. 40, 40. 40. 40. 40, 40, 40, 40. 40, 40, 40, 40, 40 40 40. ,36 39 37 33 ,37 39 40 37 ,36 ,32 37 ,40 ,40 ,42 ,46 ,44 ,45 .49 ,52 .51 ,56 ,59 .57 ,54 ,52 .57 .58 .52 .51 .52 .53 .59 .32 40.57 40.60 40.63 40.64 40.66 40.64 40.65 40.68 40.73 40.71 ___ ___ ___ --- ___ ___ ___ ___ --- -__ __- _-. --- -__ _-. __. --- ___ .__ MAY JUL SEP _ - - - - _ _ - - - 40. 40. 40. 40. 40. 39. 40. 40. 40. 40. 39. 39. 39. 40. 40. 39. 40. 40. 40. 40. - _ - __ -- -- __ -- __ _- -- -- -- 06 05 07 07 03 99 00 02 03 03 98 94 97 01 00 98 08 07 05 03 -- __ — 40 40 40 40 39 39 39 40 40 40 39 39 39 39 39 39 40 39 39 39 39 39 39 40 39 39 39 39 40 40 40 40 39 .00 .01 .06 .01 .98 .95 .99 .03 .02 .00 .98 .99 .99 .98 .98 .99 .00 .98 .98 .96 .95 .95 .97 .02 .99 .97 .91 .98 .06 .04 .02 .06 .91 40 40 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 40 39 .02 .02 .97 .93 .91 .93 .94 .91 .90 .97 .94 .88 .83 .79 .81 .82 .89 .91 .89 .91 .90 .88 .84 .80 .85 .82 .79 .82 .78 .78 --- .02 .78 39. 39. 39. 39. 39. 39. 39. 39. 39. 39. 39. 39. 39. 39. 39. 39. 39. 39. 39. 39. 39. 39. 39. 39. 39. 39. 39. 39. 39. 39. 39. 39. 39. 82 94 90 89 92 86 85 84 85 80 81 85 82 74 69 73 68 60 65 69 70 64 57 51 54 53 54 57 59 71 70 94 51 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 .68 .60 .60 .58 .56 .54 .50 .53 .51 .49 .51 .51 .48 .50 .51 .51 .49 .45 .45 .47 .45 .43 .43 .44 .43 .43 .40 .22 .25 .25 .37 .68 .22 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 39 38 39 38 .34 .23 .24 .37 .26 .20 .22 .24 .22 .20 .20 .20 .21 .21 .22 .23 .35 .22 .20 .18 .17 .16 .17 .19 .16 .17 .17 .05 .03 .95 --- .37 .95 SS 35 40 50 ONDJFMAMJJ 1987 1988 ASONDJFMAMJJASONDJFMAMJJ 1989 1990 AS GROUND-WATER LEVELS RIO GDAJATACA BASIN 423 182647066552400. Local number, 202. LOCATION.--Lat 18°26'47", long 66°55'24". Owner: P.R. Aqueduct and Sewer Authority. Name: Carmelo Barreto Garcia well. AQUIFER.--Aguada Limestone. WELL CHARACTERISTICS.--Drilled water-table well, diameter 20 in (0.51 m), cased 20 in (0.51 m) 0-296 ft (0-90.2 m), diameter 13 in (0.33 m), cased 13 in (0.33 m) 0-550 ft (0-167.6 m), perforated 270-529 ft (82.3-161.2 m) . Depth 550 ft (167.6 m). DATUM.--Elevation of land-surface datum is about 475 ft (145 m) above mean sea level, from topographic map. Measuring point: Hole on side of casing, 1.50 ft (0.46 m) above land-surface datum. Prior July 25, 1986, top of shelter floor, 3.30 ft (1.00 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.—November 1985 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 409.17 ft (124.71 m) below land-surface datum, Sept. 25, 1986; lowest water level recorded, 452.80 ft (138.01 m) below land-surface datum, June 26, 1986. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 INSTANTANEOUS OBSERVATION AT 1200 DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 LOW HIGH OCT 438.62 438.55 438.45 438.34 438.17 437.87 437.61 437.39 437.22 437.08 436.94 436.79 436.66 436.54 436.42 436.33 436.23 436.15 436.09 435.98 435.95 435.86 435.80 435.76 435.70 NOV 435.15 435.03 434.95 434.85 434.77 434.66 434.57 434.50 434.45 434.40 434.37 434.34 434.30 434.25 434.24 434.23 434.23 434.23 434.23 434.17 434.15 434.16 434.15 434.12 434.12 DEC 434.16 434.17 434.17 434.20 434.23 434.26 434.29 434.30 434.33 434.35 434.41 434.45 434.47 434.52 434.56 434.60 434.62 434.67 434.71 434.77 434.82 434.87 434.90 434.93 434.97 JAN 435.24 435.30 435.33 435.37 435.42 435.46 435.49 435.56 435.61 435.64 435.67 435.73 435.79 435.85 435.87 435.92 435.96 436.00 436.05 436.09 436.14 436.15 436.22 436.26 436.31 FBB 436.63 436.68 436.74 436.77 436.80 436.87 436.93 436.99 437.01 437.03 437.09 437.13 437.17 437.25 437.30 437.33 437.38 437.42 437.46 437.49 437.56 437.61 437.65 437.70 437.72 MAR 437.91 437.95 437.98 438.00 438.06 438.10 438.15 438.20 438.26 438.28 438.33 438.37 438.39 438.43 438.48 438.48 438.49 438.51 438.53 438.57 438.57 438.61 438.62 438.65 438.67 APR 438.45 438.43 438.42 438.39 438.42 438.46 438.46 438.48 438.50 438.53 438.52 438.55 438.58 438.61 438.62 438.63 438.67 438.69 438.73 438.76 438.77 438.78 438.82 438.84 438.87 MAY 439.00 439.03 439.08 439.08 439.10 439.13 439.17 439.21 439.22 439.23 439.28 439.30 439.31 439.32 439.35 439.36 439.37 439.39 439.41 439.42 439.43 439.45 439.49 439.53 439.54 JUN 439.74 439.76 439.77 439.79 439.82 439.85 439.87 439.89 439.90 439.92 439.93 439.94 439.96 439.94 440.00 439.99 439.97 439.93 439.89 439.88 439.83 439.81 439.80 439.77 439.80 JUL 439.88 439.94 439.97 440.00 440.03 440.05 440.06 439.99 439.89 439.79 439.66 439.56 439.39 439.25 439.14 439.02 438.88 438.79 438.72 438.66 438.58 438.51 438.45 438.40 438.39 AUG SEP 438.38 439.69 438.37 439.73 438.40 439.79 438.43 439.84 438.44 439.90 438.48 438.50 438.56 438.58 438.62 438.67 438.71 438.73 438.81 438.84 438.89 438.93 438.97 439.02 439.07 439.12 439.16 439.22 439.28 439.32 439.94 439.96 440.01 440.03 440.05 440.09 440.09 440.05 440.00 439.95 439.91 439.86 439.81 439.76 439.71 439.66 439.61 439.56 439.52 435.64 435.59 435.50 435.41 435.36 435.26 434.12 434.13 434.11 434.09 434.11 ___ 435.02 435.06 435.07 435.11 435. 14 435.19 436.37 436.42 436.45 436.46 436.53 436.60 437.79 437.82 437.85 ___ ___ ___ 438.65 438.61 438.57 438.53 438.50 438.47 438.88 438.91 438.92 438.97 438.99 ___ 439.57 439.60 439.62 439.65 439.67 439.69 439.79 439.80 439.83 439.84 439.87 --- 438.36 438.36 438.36 438.35 438.36 438.37 439.36 439.40 439.44 439.52 439.59 439.64 439.47 439.42 439.37 439.32 439.27 --- 438.62 435.26 435.15 434.09 435.19 434.16 436.60 435.24 437.85 436.63 438.67 437.91 438.99 438.39 439.69 439.00 440.00 439.74 440.06 438.35 439.64 438.37 _J 5 "* ^ t- < -£ 435 FV ui t <;"* 455 ———————————————————————————————————————————————————————— - _/ — - ^ — — - ^ — f*~ s~ " ^ -^ ^- — -- — - — -, /• -^" * ONDJFMAMJJASONDJFMAR/iJJASONDJFMAMJJAS 1987 1988 1989 1990 424 GROUND-WATER LEVELS RIO GRANDE DE ARECIBO BASIN 182737066370900. Local number, 204. LOCATION.--Lat 18°27'37», long 66°37'09". Owner: Sucesifn Marquez. Name: Gilberto Rivera well. AQUIFER.--Aymamon Limestone. WELL CHARACTERISTICS.--Abandoned unused water-table well, diameter 6 in (0.15 m), cased 6 in (0.15 m) . DATUM.--Elevation of land-surface datum is 48.0 ft (14.63 m) above mean sea level. Measuring point: Air hole on pump base, 0.50 ft (0.15 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.—October 1985 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 50.00 ft (15.24 m) below land-surface datum, 1986; lowest water level recorded, 52.52 ft (16.0 m) below land-surface datum, June 9, 10, 1990. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 LOW HIGH 51. 51. 51. 51. 51. 51. 51. 51. 51. 51. 51. 51. 51. 51. 51. 51. 51. 51. 51. 52. 52. 52. 51. 51. 51. 51. 51. 51. 51. 51. 51. 52, 51, ,87 87 ,88 88 ,91 92 ,96 97 96 ,93 94 92 ,90 86 85 ,86 ,88 .94 . 99 ,04 ,04 , 02 .98 ,95 ,95 , 92 ,91 ,89 ,86 ,83 ,85 .04 .83 51 51 51 51 51 51 51 51 51 51 51 51 51 51 51 51 51 52 52 52 51 51 51 51 51 51 52 52 52 52 52 51 .86 .89 .90 .93 .97 .93 .91 .88 .85 .82 .80 .82 .86 .87 .88 .90 .93 .00 .04 .04 .98 .93 .94 .96 .98 .98 .01 .05 .07 .06 --- .07 .80 52. 52. 52. 52. 52. 52. 52. 52. 52. 51. 52. 52. 52. 52. 52. 52. 52. 52. 52. 52. 52. 52. 52. 52. 52. 52. 52. 52. 52. 52. 52. 52. 51. 04 04 06 05 03 02 02 01 01 99 00 04 06 08 09 10 11 12 15 15 15 16 14 15 14 09 07 10 09 08 05 ,16 ,99 52. 52. 52. 52. 52. 52. 52 , 52. 52, 52. 52. 52. 52. 52. 52. 52, 52, 52, 52, 52 , 52, 52, 52, 52 , 52 , 52, 52 , 52 , 52, 52 , 52 , 52 52 ,04 .05 .06 ,06 ,09 ,10 .15 .17 ,19 .18 .17 ,16 .10 ,08 ,09 .10 .11 .10 .14 .12 .11 .13 .11 .13 .09 .06 .05 .05 .04 .03 .02 .19 .02 52.04 52.07 52.14 52.15 52.16 52.11 ___ ___ ___ --- ___ ___ ___ ___ --- _._ .-. ..- --- ___ ___ ___ --- ___ ___ ___ -__ __- --- ___ May 14, SEP 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 ___ ___ ___ ___ --- __ _ _._ ___ .26 .26 .25 .24 .25 .21 .18 .21 .18 .17 .16 .14 .13 .10 .10 .10 .09 .16 .16 .18 .19 .22 .25 ___ 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 .26 .21 .17 .14 .09 .13 .17 . 18 .20 .23 .26 .25 .25 .23 .22 .21 .20 .18 .18 .18 .20 . 18 .15 .15 .19 .23 .25 .28 .28 .32 --- .32 .09 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 -52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 .32 .28 .29 .28 .27 .26 .23 .24 .22 .23 .25 .27 .27 .28 .28 .28 .27 .27 .29 .29 .30 .30 .27 .26 .26 .26 .24 .23 .20 .20 .25 .32 .20 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 .28 .33 .35 .35 .36 .36 .39 .42 .42 .43 .41 .32 .27 .26 .25 .25 .26 .27 .28 .31 .33 .36 .32 .28 .27 .27 .27 .29 .28 .28 --- .43 .25 52 52, 52 52, 52, 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 .29 .28 .30 .32 .33 .28 .27 .27 .28 .26 .26 .25 .28 .28 .28 .28 .33 .34 .36 .37 .33 .27 .24 .22 .22 .22 .23 .23 .24 .25 .28 .37 .22 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 52 .32 .33 .34 .28 .24 .23 .22 .21 .21 .20 .16 .18 .22 .25 .27 .27 .25 .21 .15 .09 .06 .04 .03 .07 .13 .20 .24 .24 .22 .22 .23 .34 .03 52 52 52 52 52 52 51 52 52 52 52 52 52 52 52 52 52 52 51 51 51 51 52 52 52 52 52 52 52 52 52 51 .23 .20 .11 .05 .03 .00 .99 .03 .06 .11 .16 .17 .17 .14 .10 .05 .02 .01 .98 .93 .93 .99 .03 .06 .12 .14 .16 .16 .16 .14 --- .23 .93 LJ Q -B LU "*. 52 ^"H ^ tf AAhx AV* t /Hw ONDJFMAWJJASONDJFWAWJJASONDJFMAMJJAS 1987 1988 1989 1990 GROUND-WATER LEVELS 425 RIO GRANDK DE MANATI BASIN 182544066341500. Local numnber, 205. LOCATION. --Lat 18°25'44", long 66<>34'15". Owner: U.S. Geological Survey. Name: NC-05 Barceloneta near Cruce Davila. AQUIFER.--Montebello Limestone. WELL CHARACTERISTICS.--Artesian observation well, diameter 6 in (0.15 m), 0-2,564 ft (0-782 m) , cased 2.5 in (0.06 m), iron pipe 0-1,075 ft (0-328 m), open hole 1,075-2,564 ft (328-782 m). Depth 2,564 ft (782 m) measured. DATUM.--Elevation of land surface datum is 312 ft (95.1 m) above mean sea level, from topographic map. Measuring point: Top of shelter floor, 6.65 ft (2.03 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORDS.--December 1986 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 9.16 ft (2.79 m) below land-surface datum, Aug. 18, 1987; lowest water level measured, 24.94 ft (7.60 m) below land-surface datum, Aug. 10, 1990. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Oct. 4 15.87 Jan. 16 18.81 Apr. 13 20.54 July 9 23.99 Nov. 17 16.02 Feb. 7 19.60 May 9 21.75 Aug. 10 24.94 Dec. 12 17.73 Mar. 9 19.60 June 15 23.18 Sept. 7 24.83 426 GROUND-WATER LEVELS RIO GRANDE DE MANATI BASIN 182757066325600. Local number, 206. LOCATION.--Lat 18°27'57" / long 66°32'56". Owner: P.R. Department of Agriculture. Name: Plazuela No. 2. AQUIFER.--Aymamon Limes tone. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 16 in (0.41 m), cased 16 in (0.41 m) 0-85 ft (0-25.9 m), open hole 85-101 ft (25.9-30.8 m). Depth 101 ft (30.8 m) . DATUM.--Elevation of land-surface datum is about 7.0 ft (2.1 m) above mean sea level, from topographic map. Measuring point: Hole on side of casing, 1.30 ft (0.40 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--October 1985 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 3.75 ft (1.14 m) below land-surface datum, Sept. 11, 1988; lowest water level recorded, 5.89 ft (1.80 m) below land-surface datum, Apr. 11-12, 1990. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 INSTANTANEOUS OBSERVATION AT 1200 DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 LOW HIGH OCT _ - - - 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. - - - - - - - - 5. 5. _ - __ -- -- -- 54 52 53 49 44 40 38 36 36 33 33 32 33 38 41 42 39 -- -- -- -- __ -- -- -- 29 25 __ -- NOV 5 5 5 4 5 5 5 5 5 5 5 5 5 .25 ___ ___ ___ --- ___ ___ ___ ___ --- ___ ___ ___ ___ .30 .30 .88 .24 .36 --- ___ ___ ___ .41 .49 .53 .57 .63 .66 .69 --- ___ ___ DEC 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 66 66 68 66 60 57 52 55 53 53 62 60 65 67 68 64 64 62 61 60 61 61 62 63 64 60 55 59 55 54 51 68 51 JAN 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 .47 .42 .42 .44 .48 .50 .53 .56 .58 .60 .58 .56 .52 .51 .48 .48 .48 .47 .48 .48 .47 .50 .50 .52 .49 .47 .45 .44 .42 .40 .37 .60 .37 FBB 5.38 5.40 5.46 5.50 5.52 5.50 ___ ___ ___ --- ___ --- ___ --- ___ ___ ___ ___ ___ ___ ___ ___ --- ___ ___ ___ ___ ___ --- _ __ ___ MAY JUN SEP - - - - - _ - - - 5. 5. 4. 4. 4 . 4 . 4. 3. . 5. 5. 5. 5. 5. 5. 5. 5. 5. _ - -- -- -- -- -- __ -- -- -_ 70 14 51 11 05 31 42 92 24 44 59 75 99 09 20 29 38 46 53 58 65 70 -- 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 .74 .75 .74 .74 .72 .72 .75 .76 .78 .81 .84 .85 .85 .82 .84 .84 .83 .79 .78 .72 .74 .74 .74 .74 .73 .75 .76 .77 .76 .75 --- .85 .72 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 .75 .70 .67 .65 .64 .63 .58 .56 .56 .55 .59 .61 .63 .65 .65 .65 .64 .62 .62 .62 .61 .60 .59 .57 .57 .61 .63 .59 .56 .55 .56 .75 .55 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 .60 .64 .66 .65 .68 .67 .70 .73 .74 .76 .76 .73 .67 .65 .62 .57 .56 .56 .57 .59 .64 .66 .67 .66 .64 .64 .64 .64 .64 .60 --- .76 .56 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 60 59 61 62 65 62 62 61 63 64 64 63 64 63 63 61 61 62 65 64 65 64 62 58 57 57 56 56 56 57 58 65 56 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 5. 61 62 64 62 57 57 57 56 57 55 54 54 57 59 60 60 57 51 50 48 47 44 43 46 49 55 58 57 54 53 50 64 43 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 .52 .52 .47 .44 .43 .39 .38 .43 .44 .48 .51 .50 .47 .41 .39 .36 .36 .36 .36 .34 .33 .37 .40 .43 .48 .47 .49 .48 .46 .46 --- .52 .33 Ul CD; LU i—. < 0 \/ N 7 D k J t F '/ M > A . M If J v. J 1 V A , f S I 0p N j D I ^ J A F *\ M ^ A - M -^ J 'vA J ^ A S r- 0 t N M D V J F|\ M V" A „ M A J «vT J * A ^ S 1989 1990 GROUND-WATER LEVELS RIO GRANDE DB MANATI BASIN 427 182710066303700. Local number, 207. LOCATION.--Lat 18°27'10", long 66°30'37". Owner: P.R. Aqueduct and Sewer Authority. Name: Cantito La Luisa. AQUIPER.--Aymamon Limes tone. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 20 in (0.51 m), cased 20 in (0.51 m) 0-30 ft (0-9.14 m), cased 10 in (0.25 m) 0-126 ft (0-38.4 m), perforated 80-126 ft (24.4-38.4 m). Depth 126 ft (38.4 m) DATUM.--Elevation of land-surface datum is about 59.0 ft (18.0 m) above mean sea level, from topographic map. Measuring point: Hole on side of casing, 2.00 ft (0.61 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--October 1985 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 36.38 ft (11.09 m) below land-surface datum. May 15, 1986; lowest water level recorded, 89.83 ft (27.38 m) below land-surface datum, Oct. 5, 1985. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 INSTANTANEOUS OBSERVATION AT 1200 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 LOW HIGH OCT 38.86 38.87 38.89 38.91 38.93 38.94 38.97 38.97 38.98 38.98 38.99 39.00 39.02 39.03 39.05 39.09 39.10 39.12 39.08 39.10 39.10 39.04 38.99 38.89 38.85 38.84 38.83 38.82 38.79 38.76 38.76 39.12 38.76 NOV 38.78 38.81 38.83 38.84 38.85 38.86 38.86 38.86 38.86 38.87 38.88 38.91 38.95 38.98 38.99 39.00 38.98 39.00 39.02 39.04 39.04 39.03 39.03 39.03 39.05 39.09 39.12 39.14 39.16 39.17 39.17 38.78 DEC 39.17 39.18 39.18 39.17 39.16 39. 13 39. 10 39.12 39.13 39.15 39.18 39.20 39.21 39.22 39.23 39.24 39.23 39.22 39.22 39.22 39.23 39.25 39.26 39.28 39.31 39.29 39.25 39.26 39.26 39.26 39.24 39.31 39.10 JAN 39.23 39.22 39.23 39.24 39.25 39.27 39.29 39.34 39.38 39.41 39.42 39.42 39.42 39.40 39.39 39.36 39.34 39.34 39.35 39.35 39.32 39.35 39.37 39.40 39.41 39.39 39.38 39.37 39.36 39.35 39.34 39.42 39.22 FEB 39.34 39.35 39.38 39.40 39.41 39.41 39.41 39.39 39.36 39.35 39.36 39.35 39.35 39.37 39.39 39.42 39.45 39.47 39.48 39.50 39.50 39.50 39.49 39.46 39.43 39.40 39.37 39.36 39.50 39.34 MAR 39.35 39.35 39.39 39.41 39.43 39.46 39.47 39.49 39.50 39.47 39.43 39.39 39.34 39.24 39.21 39.19 39.13 39.12 39.11 39.09 39.09 39.08 39.08 39.08 39.08 39.09 39.11 39.13 39.15 39.18 39.19 39.50 39.08 APR 39.22 39.22 39.21 39.20 39.18 39.19 39.22 39.23 39.25 39.28 39.32 39.33 39.34 39.33 39.34 39.34 39.35 39.34 39.35 39.34 39.35 39.31 39.28 39.26 39.28 39.32 39.36 39.40 39.42 39.44 39.44 39.18 MAY 39.46 39.46 39.45 39.42 39.41 39.41 39.40 39.40 39.41 39.42 39.42 39.45 39.47 39.49 39.51 39.52 39.53 39.53 39.55 39.55 39.55 39.55 39.55 39.54 39.55 39.56 39.56 39.55 39.53 39.52 39.54 39.56 39.40 JUN 39.56 39.58 39.60 39.61 39.62 39.63 39.65 39.67 39.67 39.68 39.68 39.67 39.65 39.63 39.58 39.55 39.53 39.53 39.53 39.55 39.57 39.61 39.63 39.64 39.64 39.65 39.65 39.65 39.64 39.61 39.68 39.53 JUL 39.61 39.61 39.61 39.62 39.64 39.64 39.63 39.63 39.63 39.64 39.65 39.65 39.66 39.67 39.67 39.66 39.66 39.66 39.67 39.68 39.69 39.68 39.67 39.67 39.65 39.62 39.60 39.58 39.57 39.57 39.57 39.69 39.57 AUG 39.58 39.59 39.59 39.57 39.55 39.54 39.55 39.54 39.55 39.54 39.53 39.52 39.53 39.54 39.54 39.55 39.53 39.52 39.51 39.51 39.51 39.50 39.49 39.50 39.52 39.54 39.56 39.56 39.55 39.54 39.54 39.59 39.49 SEP 39.54 39.54 39.52 39.49 39.48 39.46 39.46 39.46 39.46 "5 -on 37 38 39 \J/\\ \,•f- \^ \'x / y\ j^ V V \ "~-~^f \\u r\Jf^- jv. w^ ' ONDJFMAMJJ 1987 1988 ASONDJFMAM 1989 JJASONDJFMAMJJ 1990 AS 428 GROUND-WATER LEVELS RIO GRANDE DE MANATI BASIN 182308066260400. Local number, 210. LOGATION.--Lat 18°23'08", long 66°26'04". Owner: Gelo Martinez. Name: Gelo Martinez well. AQUIFER.--Lares Limestone. WELL CHARACTERISTICS.—Drilled unused water-table well, diameter 8 in (0.20 m) , cased 8 in (0.20 m). DATUM.--Elevation of land-surface datum is about 574 ft (174.9 m) above mean sea level, from topographic map. Measuring point: Hole on side of casing, 2.00 ft (0.61 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--October 1985 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 40.56 ft (12.36 m) below land-surface datum. May 22, 1986; lowest water level recorded, 76.60 ft (23.3 m) below land-surface datum, Sept. 30, 1990. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 INSTANTANEOUS OBSERVATION AT 1200 OCT NOV DEC JAN APR AUG SEP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 LOW HIGH 69.72 69.72 69.72 69.70 69.68 69.65 69.63 69.60 69.58 69.56 69.53 69.51 69.48 69.46 69.44 69.41 69.39 69.37 69.34 69.32 69.29 69.27 69.25 69.22 69.20 69.17 69.15 69.13 69.10 69.08 69.05 69.72 69.05 69.03 69.06 69.09 69.12 69.16 69.17 69.16 69.11 69.10 69.10 69.10 69.10 69.12 69.15 69.16 69.12 69.06 69.03 69.03 69.03 69.03 69.05 69.09 69.12 69.15 69.17 69.19 69.23 69.25 69.27 --- 69.27 69.03 69.30 69.33 69.36 69.41 69.47 69.51 69.55 69.60 69.64 69.67 69.71 69.75 69.83 69.88 69. 93 69.97 70.02 70.06 70.13 70.17 70.24 70.29 70.32 70.35 70.37 70.41 70.44 70.47 70.50 70.53 70.57 70.57 69.30 70.60 70.65 70.68 70.69 70.69 70.77 70.82 70.85 70.88 70.93 70.96 71.02 71.07 71.13 71.18 71.25 71.29 71.32 71.34 71.37 71.39 71.42 71.44 71.45 71.45 71.46 71.48 71.49 71.50 71.52 71.59 71.59 70.60 71.61 71.62 71.63 71.63 71.63 71. 63 71. 66 71.69 71.72 71.75 71.78 71.82 71.85 71.88 71.91 71.94 71.97 72.00 72.03 72.06 72.10 72. 13 72.16 72.19 72.22 72.25 72.28 72.31 ___ ___ --- 72.31 71. 61 72.35 72.38 72.41 72.44 72.47 72.50 72.54 72.56 72.57 72.57 72.56 71.77 65.15 60.62 56.09 51.56 48.72 48.87 49.24 49.70 50.96 53 .80 56.45 58.88 60.26 61.62 62.20 62.40 62.64 63.49 64.37 72.57 48.72 65.08 65.58 65.80 66.01 66.14 66.28 66.47 66.70 66.94 67.22 67.60 67.93 68.25 68.58 68.77 68.92 69.04 69.14 69.15 69.56 69.73 69.86 69.99 70.13 70.24 70.33 70.43 70.51 70.60 70.67 --- 70.67 65.08 70.72 70.80 70.86 70.90 70.96 71.02 71.09 71.14 71.24 71.29 71.32 71.35 71.38 71.44 71.48 71.52 71.53 71.54 71.54 71.71 71.75 71.80 71.83 71.88 71.91 71.96 72.00 72.04 72.09 72.15 72.20 72.20 70.72 72.24 72.26 72.30 72.33 72.36 72.39 72.39 72.43 72.45 72.47 72.49 72.52 72.57 72.60 72.64 72.65 72.67 72.68 72.69 72.71 72.81 72.85 72.88 72.90 72.94 72.97 73.00 73.04 73.06 73.09 --- 73.09 72.24 73.11 73.15 73.22 73.26 73.31 73.34 73.38 73.41 73.44 73.47 73.48 73.51 73.58 73.63 73.65 73.69 73.73 73 .81 73.86 73.89 73.98 74.02 74.05 74.09 74.15 74.20 74.22 74.22 74.23 74.23 74.45 74.45 73.11 74.51 74.55 74.60 74.65 74.72 74.78 74.83 74.88 74.94 74.97 75.02 75.08 75.13 75.17 75.20 75.22 75.25 75.29 75.34 75.39 75.45 75.51 75.55 75.60 75.65 75.68 75.74 75.78 75.83 75.87 75.92 75.92 74.51 75.96 76.00 76.04 76.07 76.10 76.13 76.16 76.19 76.22 76.23 76.25 76.27 76.28 76.31 76.33 76.36 76.39 76.41 76.44 76.45 76.46 76.48 76.49 76.51 76.53 76.54 76.56 76.57 76.59 76.60 --- 76.60 75.96 WTR YR 1990 MEAN 71.03 LOW 76.60 HIGH 48.72 1 "f 40 60 80 ONDJFMAMJJASONDJFMAMJJASONDJFMAMJJAS 1987 1988 1989 1990 GROUND-WATER LEVELS RIO CIBOCO BASIN 429 182647066201700. Local number, 70. LOCATION.--Lat 18°26'47", long 66°20'17". Owner: P.R. Aqueduct and Sewer Authority. Name: Sabana Hoyos. AQUIFER.--Limestone of Tertiary Age. WELL CHARACTERISTICS.--Drilled unused artesian well, diameter 8 in (0.20 m), cased 0-90 ft (0-27.43 m), perforated. Depth 90 ft (27.43 m). DATUM.--Elevation of land-surface datum is about 49 ft (14.9 m) above mean sea level, from topographic map. Measuring point: Top of casing wooden cover, 1.30 ft (0.40 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--February 1960 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 21.33 ft (6.50 m) below land-surface datum, Oct. 26, 1976; lowest water level recorded, 31.10 ft (9.48 m) below land-surface datum, July 31, 1975. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 INSTANMTANEOUS OBSERVATION AT 1200 DAY NOV DEC JAN APR MAY JUN JUL AUG 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL MEAN MAX MIN 27.38 27.39 27.42 27.43 27.45 27.47 27.50 27.52 27.55 27.58 27.61 27.64 27.68 27.71 27.74 27.77 27.80 27.83 27.84 27.85 27.86 27.78 27.77 27.77 27.78 27.78 27.81 27.83 27.84 27.85 27.85 858.08 27.68 27.86 27.38 27.85 27.86 27.86 27.87 27.86 27.86 27.86 27.86 27.86 27.87 27.88 27.89 27.91 27.92 27.92 27.93 27.95 27.97 27.99 28.00 28.02 28.04 28.06 28.07 28.09 28.11 28.13 28.15 28.18 28.20 --- 839.02 27.97 28.20 27.85 28.22 28.25 28.26 28.28 28.30 28.31 28.33 28.35 28.37 28.39 28.41 28.43 28.45 28.47 28.49 28.51 28.53 28.54 28.56 28.59 28.60 28.62 28.64 28.66 28.68 28.70 28.72 28.74 28.74 28.75 28.75 883.64 28.50 28.75 28.22 28.75 28.76 28.77 28.78 28.80 28.81 28.81 28.82 28.84 28.86 28.87 28.88 28.89 28.90 28.91 28.91 28.92 28.92 28.93 28.90 28.88 28.87 28.87 28.87 28.86 28.87 28.87 28.86 28.88 28.87 28.87 894.60 28.86 28.93 28.75 28.87 28.88 28.89 28.89 28.90 28.91 28.92 28.92 28.92 28.90 28.89 28.88 28.89 28.90 28.90 28.90 28.91 28.90 28.89 28.88 28.88 28.88 28.86 28.85 28.83 28.82 28.81 28.81 ___ ___ --- 808.68 28.88 28.92 28.81 28.81 28.82 28.83 28.85 28.86 28.88 28.90 28.92 28.93 28.94 28.92 28.90 28.83 28.76 28.70 28.66 28.62 28.57 28.53 28.50 28.47 28.46 28.46 28.46 28.46 28.47 28.48 28.49 28.51 28.52 28.53 889.04 28.68 28.94 28.46 28.55 28.57 28.58 28.59 28.59 28.61 28.63 28.65 28.67 28.69 28.72 28.74 28.76 28.77 28.78 28.80 28.80 28.82 28.84 28.85 28.86 28.87 28.87 28.89 28.91 28.92 28.94 28.95 28.97 28.98 863.17 28.77 28.98 28.55 29.00 29.01 29.02 29.02 29.03 29.04 29.04 29.05 29.05 29.05 29.06 29.08 29.09 29.10 29.10 29.11 29.12 29.13 29.14 29.15 29.16 29.17 29.19 29.20 29.21 29.23 29.24 29.26 29.28 29.30 29.31 902.94 29.13 29.31 29.00 29.33 29.33 29.34 29.35 29.35 29.36 29.36 29.37 29.37 29.39 29.40 29.41 29.41 29.42 29.40 29.39 29.38 29.38 29.38 29.39 29.41 29.43 29.44 29.45 29.46 29.47 29.48 29.49 29.50 29.51 --- 882.15 29.40 29.51 29.33 29.51 29.52 29.53 29.54 29.56 29.56 29.57 29.57 29.59 29.61 29.60 29.61 29.61 29.62 29.62 29.62 29.63 29.64 29.65 29.65 29.65 29.65 29.65 29.66 29.65 29.50 29.49 29.49 29.49 29.50 29.50 917.04 29.58 29.66 29.49 29.53 29.53 29.34 29.31 29.29 29.27 29.26 29.26 29.26 29.24 29.23 29.23 29.23 29.22 29.21 29.21 29.20 29.20 29.20 29.19 29.18 29.18 29.17 29.16 29.17 29.18 29.19 29.19 29.20 29.23 29.24 906.50 29.24 29.53 29.16 29.26 29.25 29.28 29.28 29.29 29.29 29.30 29.28 29.27 29.28 29.29 29.30 29.31 29.32 29.33 29.33 29.33 29.34 29.34 29.34 29.35 29.36 29.37 29.38 29.39 29.41 29.42 29.42 29.44 29.44 --- 879.99 29.33 29.44 29.25 WTR YR 1990 MEAN 28.84 LOW 29.66 HIGH 27.38 " -JO 24 28 32 ^r *J -~/ ~x,. fr v^ J J^ -^ \ "~"-/ 'X, \ y ^ --- -, ^ ~~ -... ONDJFMAMJJASONDJFMAMJJASONDJFMAMJJAS 1987 1988 1989 1990 430 GROUND-WATER LEVELS RIO CIBUCO BASIN 182615066235300. Local number, 211. LOCATION.--Lat 18°26'15", long 66°23'53». Owner: P.R. Aqueduct and Sewer Authority. Name: Rosario No. 2. AQOIPER.--Aguada Limestone. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 14 in (0.36 m) 0-200 ft (0-61.0 m), diameter 12 in (0.30 m) 200-250 ft (61.0-76.2 m), cased 12 in (0.30 m) 0-250 ft (0-76.2 m), perforated 210-250 ft (64.0-76.2 m), diameter 10 in (0.25 m) 250-270 ft (76.2-82.3 m), open hole; concrete sealed 0-200 ft (0-61.0 m) . Depth 270 ft (82.3 m) . DATUM.--Elevation of land-surface datum is about 215 ft (65.5 m) above mean sea level, from topographic map. Measuring point: Hole on side of casing, 1.15 ft (0.35 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OP RECORD.--October 1985 to current year. EXTREMES FOR PERIOD OP RECORD.--Highest water level recorded, 191.29 ft (58.30 m) below land-surface datum, May 16, 1986; lowest water level recorded, 193.63 ft (59.02 m) below land-surface datum, July 21-25, 1990. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 INSTANTANEOUS OBSERVATION AT 1200 OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 192.75 192.76 192.80 192.82 192.82 193.06 193.06 193.06 193.06 193.06 193.26 193.26 193.26 193.25 193.25 193.27 193.27 193.27 193.27 193.27 193.32 193.32 193.32 193.35 193.37 193.15 193.15 193.15 193.16 193.16 193.41 193.41 193.41 193.41 193.41 193.50 193.50 193.50 193.50 193.50 193.56 193.56 193.56 193.56 193.57 193.52 193.52 193.52 193.52 193.49 6 7 8 9 10 192.83 192.84 193.06 193.06 193.06 193.06 193.25 193.25 193.26 193.28 193.06 193.30 193.28 193.30 193.31 193.31 193.31 193.40 193.40 193.42 193.42 193.16 193.16 193.17 193.17 193.41 193.40 193.40 193.38 193.50 193.53 193.54 193.55 193.57 193.57 193.57 193.58 193.48 193.48 193.48 193.48 193.42 193.21 193.38 193.57 193.58 193.39 193.39 193.39 193.39 11 12 13 14 15 193.11 193.14 193.16 193.16 193.31 193.31 193.31 193.31 193.18 193.31 193.31 193.31 193.30 193.30 193.30 193.42 193.37 193.27 193.13 193.09 193.23 193.26 193.27 193.27 193.27 193.37 193.37 193.39 193.40 193.42 193.60 193.60 193.60 193.59 193.52 193.58 193.58 193.61 193.61 193.61 193.39 193.39 193.39 193.39 193.39 16 17 18 19 20 192.87 192.87 192.88 192.88 193.18 193.18 193.18 193.18 193.18 193.31 193.27 193.27 193.27 193.27 193.30 193.31 193.31 193.31 193.31 193.09 192.97 192.95 192.95 192.95 193.27 193.27 193.27 193.27 193.27 193.43 193.44 193.44 193.44 193.44 193.52 193.50 193.50 193.50 193.50 193.61 193.61 193.61 193.61 193.61 193.39 193.39 193.39 193.39 193.39 21 22 23 24 25 192.88 192.88 192.88 192.91 192.94 193.20 193.21 193.22 193.25 193.27 193.27 193.27 193.27 193.27 193.27 193.31 193.33 193.33 193.33 193.33 192.95 192.95 192.95 192.95 193.00 193.27 193.27 193.27 193.27 193.27 193.46 193.46 193.47 193.47 193.48 193.50 193.53 193.55 193.55 193.55 193.61 193.63 193.63 193.63 193.63 193.39 193.39 193.39 193.40 193.44 26 27 28 29 30 31 192.95 192.98 193.02 193.05 193.06 ___ 193.27 193.27 193.26 193.26 193.26 193.26 193.27 193.27 193.27 193.27 193.27 193.27 193.33 193.32 193.32 ___ ___ ___ 193.00 193.01 193.03 193.07 193.09 193.12 193.29 193.32 193.36 193.37 193.38 ___ 193.50 193.52 193.52 193.52 193.51 193.50 193.56 193.56 193.56 193.56 193.56 --- 193.53 193.52 193.52 193.52 193.52 193.52 193.45 193.47 193.47 193.47 193.47 LOW HIGH 193.27 193.06 193.31 193.25 193.33 193.27 193.42 192.95 193.38 193.15 193.52 193.37 193.60 193.50 193.63 193.52 oop? -JO a:* UJ< 190 192 194 r ONDJFMAMJJ 1987 1988 ASONDJFMAM 1989 JJASONDJFMAM 1990 JJAS GROUND-WATER LEVELS RIO CIBUCO BASIN 431 182515066194000. Local number, 212. LOCATION. --Lat 18°25'15", long 66°19'40''. Owner: U.S. Geological Survey. Name: Ponderosa TW-1. AQUIFER.--Aguada Limestone-Cibao Formation. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 4 in (0.10 m), cased 4 in (0.10 m) 0-136 ft (0-41.1 m), perforated 121-131 ft (36.9-39.9 m); bentonite packed 0.5-121 ft (0.15-36.9 m) . Depth 136 ft (39.9 m). DATUM.--Elevation of land-surface datum is about 98.0 ft (29.9 m) above mean sea level, from topographic map. Measuring point: Shelter floor on top of 4 in (0.10 m) casing, 3.00 ft (0.91 m) above land-surface datum. REMARKS.--Recording observation well. Water levels affected by nearby pumping well. PERIOD OF RECORD.—October 1985 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 63.05 ft (19.22 m) below land-surface datum, July 15, 1987; lowest water level recorded, 74.63 ft (22.75 m) below land-surface datum, Oct. 27,28, 1986. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 INSTANTANEOUS OBSERVATION AT 1200 DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 LOW HIGH OCT 67.11 67.09 67.08 67.06 67.06 67.06 67.06 67.07 67.08 67.10 67.14 67.15 67.19 67.22 67.24 67.27 67.31 67.34 67.36 67.36 67.37 67.37 67.37 67.36 67.36 67.35 67.36 67.36 67.37 67.38 67.40 67.40 67.06 NOV 67.41 67.42 67.43 67.44 67.46 67.43 67.42 67.43 67.43 67.45 67.46 67.47 67.47 67.46 67.45 67.43 67.43 67.45 67.45 67.45 67.46 67.48 67.51 67.53 67.56 67.58 67.61 67.64 67.67 67.69 67.69 67.41 DEC 67.73 67.77 67.79 67.83 67.88 67.92 67.94 67.98 68.01 68.04 68.07 68.12 68.16 68.20 68.23 68.27 68.30 68.33 68.37 68.40 68.44 68.48 68.50 68.54 68.55 68.58 68.63 68.65 68. 67 68. 68 68.72 68.72 67.73 JAN 68.74 68.77 68.79 68.81 68.83 68.85 68.87 68.88 68.91 68.93 68.94 68.95 68.97 68.99 69.00 69.03 69.08 69.11 69.14 69.16 69.16 69.16 69.16 69.17 69.18 69.21 69.22 69.23 69.24 69.25 69.34 69.34 68.74 FEB 69.31 69.32 69.32 69.33 69.33 69.35 69.36 69.38 69.38 69.38 69.38 69.38 69.37 69.37 69.38 69.38 69.39 69.39 69.39 69.38 69.37 69.35 69.34 69.29 69.27 69.26 69.25 69.24 69.39 69.24 MAR 69.24 69.23 69.24 69.24 69.24 69.24 69.26 69.28 69.29 69.30 69.30 69.28 69.17 69.00 68.84 68.71 68.58 68.46 68.37 68.29 68.21 68.15 68.09 68.05 68.02 68.00 67 .98 67 .97 67.96 67.95 67.95 69.30 67.95 APR 67.94 67.94 67.97 67.97 68.01 68.04 68.06 68.07 68.10 68.13 68.15 68.19 68.22 68.25 68.27 68.30 68.33 68.36 68.41 68.43 68.46 68.49 68.52 68.55 68.58 68.61 68.65 68. 67 68.69 68.72 68.72 67.94 MAY 68.74 68.78 68.81 68.83 68.85 68.88 68.91 68.94 68.95 68.97 68.97 68.98 69.01 69.03 69.05 69.06 69.09 69.11 69.14 69.13 69.15 69.16 69.20 69.24 69.26 69.27 69.29 69.30 69.32 69.35 69.38 69.38 68.74 JUN 69.39 69.42 69.44 69.46 69.50 69.52 69.53 69.57 69.58 69.60 69.62 69.63 69.65 69.68 69.70 69.70 69.71 69.76 69.76 69.76 69.78 69.78 69.79 69.80 69.80 69.83 69.85 69.87 69.89 69.93 69.93 69.39 JUL 69.96 69.98 70.01 70.04 70.06 70.09 70.12 70.15 70.18 70.20 70.24 70.26 70.28 70.29 70.30 70.30 70.33 70.35 70.36 70.37 70.36 70.37 70.38 70.39 70.39 70.37 70.33 70.31 70.28 70.27 70.27 70.39 69.96 AUG 70.27 70.27 70.25 70.21 70.17 70.14 70.13 70.12 70.11 70.09 70.07 70.05 70.03 70.02 70.02 70.02 70.02 70.01 70.00 69.99 69.99 69.99 69.99 70.00 70.01 70.01 70.01 70.03 70.05 70.06 70.08 70.27 69.99 SEP 70.11 70.12 70.13 70.14 70.15 70.16 70.17 70.18 70.17 70.16 70.16 70.16 70.16 70.17 70.18 70.17 70.16 70.16 70.16 70.16 70.16 70.16 70.16 70.16 70.17 70.19 70.21 70.23 70.25 70.26 70.26 70.11 WTR YR 1990 MEAN 68.96 LOW 70.39 HIGH 67.06 60 65 70 V I" J ONOJFMAMJJ 1987 1988 ASONDJFMAM 1989 JJASONDJFMAM 1990 JJAS 432 GROUND-WATER LEVELS RIO CIBOCO BASIN 182330066185700. Local number, 213. LOCATION.--Lat 18°23'30", long 66°18'57". Owner: P.R. Aqueduct and Sewer Authority. Name: Pampano No. 2. AQUIFER.--Rio Indio Limestone-Lares Limestone. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 20 in (0.51 m), cased 20 in (0.51 m) 0-130 ft (0-39.6 m) , diameter 14 in (0.36 m), cased 12 in (0.30 m) 0-220 ft (0-67.1 m); open hole 220-330 ft (67.6- 100.6 m). Depth 330 ft (100.6 m) . DATUM.--Elevation of land-surface datum is about 394 ft (120 m) above mean sea level, from topographic map. Measuring point: Hole on side of casing, 2.95 ft (0.90 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--October 1985 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 34.40 ft (10.50 m) below land-surface datum, Dec. 6, 1985; lowest water level recorded, 55.00 ft (16.8 m) below land-surface datum, Sept. 30, 1990. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 INSTANTANEOUS OBSERVATION AT 1200 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 LOW HIGH OCT 44.39 44.30 44.06 43. 60 43.49 43.43 43.36 43.94 44.01 44. 04 44.19 44.27 44.36 44.42 44.50 44.55 44.05 44.34 43.94 43.69 43.52 43.22 42.89 43.47 43.52 NOV 42.89 42.96 42.93 43.01 43.08 43.04 42.85 42.57 42.45 42.47 42.61 42.51 42.65 42.57 42.73 42.43 42.73 42.73 42.73 42.70 42.75 42.84 42.92 42.95 42 .99 DEC 43.31 43.51 43.62 43. 66 43.75 43.82 43.87 43.89 44.05 44.10 44.10 44. 18 44.26 44.33 44.50 44.49 44. 62 44. 62 44.72 44.77 44.84 44.93 45.03 45.11 45.16 JAN 45.70 45.83 45.89 45.92 45.98 46.08 46.12 46.20 46.23 46.32 46.33 46.43 46.60 46.68 46.77 46.81 46.80 46.97 47.04 46.71 46.58 46.53 46.52 46.49 46.49 FEB 46.93 46.90 46.92 47.63 47.83 48.03 48.13 48.29 48.37 48.38 48.58 48.67 48.76 48.87 48.96 49.00 49.06 49.14 49.21 49.23 49.26 49.29 49.32 49.44 49.45 MAR 49.55 49.64 49.69 49.70 49.78 49.80 49.83 49.86 49.98 50.06 50.00 49.73 49.13 48.33 47 .72 47.31 46.76 46.18 45.65 45.39 45.00 44.89 44.65 44.65 44.69 APR 44.53 44.45 44.47 44.50 44.54 44.63 44.75 44.75 44.74 44.73 44.86 44.92 44.95 44.99 45.00 45.08 45.19 45.17 45.28 45.30 45.33 45.42 45.48 45.55 45.57 MAY 45.89 45.97 46.08 46.10 46.25 46.30 46.43 46.55 46.57 46.85 46.97 47.02 47.06 47.08 47.15 47.23 47.29 JUN 47.83 47.92 47.96 47.94 48.00 48.07 48.19 48.34 48.45 48.52 48.54 48.61 48.66 48.70 48.80 48.81 48.84 48.84 48.89 48.94 49.11 49.13 49.16 49.20 49.31 JUL 49.73 49.83 49.96 49.99 50.02 50.12 50.19 50.24 50.37 50.42 50.63 50.70 50.80 50.80 50.87 51.02 51.05 51.08 51.18 51.28 51.36 51.38 51.41 51.42 51.49 AUG 51.97 51.97 52.03 52.14 52.19 52.23 52.32 52.44 52.56 52.61 52.63 52.73 52.71 52.77 52.79 52.85 52.96 52.99 53.09 53.17 53.22 53.28 53.31 53.32 53.37 SEP 53.72 53.75 53.82 53.85 53.89 53.92 53.97 54.03 54.06 54.15 54.18 54.25 54.32 54.35 53.90 54.33 54.40 54.50 54.54 54.57 54.60 54.64 54.70 54.77 54.79 43.52 42.87 42.65 42.54 42.45 42.34 43 .05 43.13 43.20 43.20 43.21 --- 45.28 45.33 45.34 45.36 45.52 45.63 46.56 46.59 46.57 46.55 46.76 47.30 49.49 49.48 49.49 __. ___ ___ 44.59 44.57 44.56 44.50 44.51 44.53 45.63 45.69 45.73 45.79 45.85 ___ 47.41 47.43 47.49 47.55 47.65 47.67 49.36 49.42 49.54 49.56 49.69 ___ 51.54 51.62 51.65 51.75 51.84 51.93 53.39 53.37 53.46 53.54 53.64 53.69 54.80 54.82 54.88 54.95 54.98 ___ 44.55 42.34 43.21 42.43 45. 63 43.31 47.30 45.70 49.49 46.90 50.06 44.50 45.85 44.45 49. 69 47.83 51.93 49.73 53.69 51.97 54.98 53.72 35 45 vy/\ v/ X ONDJFMAMJJASONDJFMAMJJASONDJFMAMJJAS 1987 1988 1989 1990 GROUND-WATER LEVELS RIO DE LA PLATA BASIN 433 182746066170800. Local number, 214. LOCATION.--Lat 18027'46", long 66°17'08". Owner: Dorado Beach Hotel. Name: Dorado Beach No. 7. AQUIFER.--Aymamon Limestone. WELL CHARACTERISTICS.--Drilled water-table well, diameter 18 in (0.46 m). Depth 100 ft (30.5 m) . DATUM.--Elevation of land-surface datum is about 39.0 ft (11.9 m) above mean sea level, from topographic map. Measuring point: Hole on side of casing, 1.10 ft (0.34 m) above land-surface datum. REMARKS.--Recording observation well. Water levels affected by nearby pumping well. PERIOD OP RECORD.-- November 1985 to current year. EXTREMES FOR PERIOD OP RECORD.--Highest water level recorded, 18.23 ft (5.56 m) below land-surface datum, Nov. 16, 1985; lowest water level recorded, 20.58 ft (6.27 m) below land-surface datum, June 22, 1990. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 INSTANTANEOUS OBSERVATION AT 1200 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 LOW HIGH OCT 19.43 19.43 19.49 19.49 19.52 19.56 19.60 19.59 19.58 19.54 19.55 19.53 19.52 19.47 19.54 19.54 19.58 19.66 19.76 19.79 19.77 19.72 19.63 19.58 19.59 19.57 19.61 19.57 19.54 19.52 19.51 19.79 19.43 NOV 19.49 19.58 19.60 19.65 19.69 19.62 19.58 19.52 19.49 19.47 19.50 19.54 19.60 19.64 19.66 19.71 19.75 19.82 19.83 19.81 19.74 19.70 19.70 19.75 19.77 19.79 19.81 19.88 19.90 19.88 19.90 19.47 DEC 19.85 19.88 19.89 19.88 19.88 19.84 19.87 19.88 19.88 19.86 19.88 19.96 20.01 20.05 20.08 20.04 20.05 20.06 20.06 20.02 20.04 20.08 20.07 20.07 20.09 20.04 20.05 20.09 20.06 20.07 20.03 20.09 19.84 JAN 20.01 20.02 20.05 20.03 20.06 20.05 20.05 20.08 20.13 20.13 20.13 20.13 20.11 20.09 20.08 20.08 20.08 20.07 20.08 20.04 20.04 20.06 20.05 20.08 20.05 20.04 20.05 20.05 20.03 20.01 19.99 20.13 19.99 FEB 20.03 20.07 20.08 20.07 20.08 20.05 20.04 19.98 19.98 20.01 20.01 20.00 20. 03 20.05 20.08 20.11 20.15 20.15 20.14 20.15 20.11 20.09 20.06 20.01 19.96 19.92 19.89 19.92 20. 15 19.89 MAR 19.94 20.01 20.08 20.08 20.10 20.11 20.10 20.11 20.11 20.09 20.09 20.06 20.06 20.03 20.00 20.02 20.02 20.03 20.00 19.95 19.92 19.90 19.90 19.91 19.90 19.96 19.94 19.98 19.97 20.00 20.01 20.11 19.90 APR 20.03 20.00 19.99 19.96 19.96 20.03 20.07 20.07 20.10 20.13 20.18 20.16 20.13 20.09 20.06 20.06 20.09 20.08 20.09 20.11 20.14 20.12 20.10 20.13 20.14 20.17 20.21 20.24 20.25 20.25 20.25 19.96 MAY 20.24 20.20 20.20 20.19 20.21 20.19 20.18 20.21 20.19 20.18 20.20 20.26 20.25 20.27 20.28 20.31 20.29 20.29 20.34 20.35 20.34 20.35 20.36 20.35 20.37 20.37 20.33 20.33 20.33 20.32 20.36 20.37 20.18 JUN 20.43 20.45 20.46 20.43 20.39 20.39 20.39 20.41 20.41 20.41 20.40 20.35 20.30 20.32 20.30 20.31 20.32 20.33 20.35 20.39 20.42 20.45 20.42 20.38 20.36 20.35 20.36 20.39 20.39 20.39 20.46 20.30 JUL 20.41 20.43 20.46 20.50 20.47 20.41 20.41 20.39 20.36 20.36 20.38 20.39 20.44 20.47 20.46 20.46 20.48 20.46 20.49 20.48 20.45 20.39 20.37 20.32 20.30 20.30 20.31 20.32 20.35 20.38 20.42 20.50 20.30 AUG 20.41 20.41 20.37 20.29 20.21 20.20 20.20 20.20 20.22 20.19 20.17 20.20 20.22 20.23 20.23 20.23 20.20 20.15 20.05 20.02 20.02 19.99 20.00 20.09 20.15 20.22 20.24 20.22 20.19 20.20 20.26 20.41 19.99 SEP 20.26 20.24 20.17 20.12 20.12 20.09 20.10 20.18 20.24 20.29 20.33 20.29 20.30 20.26 20.23 20.20 20.18 20.16 20.15 20.12 20.12 20.17 20.21 20.25 20.31 20.33 20.34 20.32 20.31 20.28 20.34 20.09 WTR YR 1990 MEAN 20.08 LOW 20.50 HIGH 19.43 WATER LEVEL, IN FEET BELOW LAND- SURFACE DATUM K) _. .-* O ^ ID 00 S.1 ' ^ -^ C; in o in <£> in ^7 ^ •\. / •Af" V,W Jr . r * / ^* "\ v-v xn MV if t -f •7M m-fe V* it j ^\ JV tf Jl \A ONDJFMAMJJ ASONDJFMAMJ J ASONDJFMAMJ J AS 434 GROUND-WATER LEVELS RIO DE LA PLATA BASIN 182530066135400. Local number, 216. LOCATION.--Lat 18°25'30 H , long 66°13'54". Owner: P.R. Aqueduct and Sewer Authority. Name: Pozo Navy-Campanillas. AQUIFER.--Aguada Limestone. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 16 in (0.41 m) 0-106 ft (0-32.3 m), cased 16 in (0.41 m) 0-20 ft (0-6.10 m), cased 12 in (0.30 m) 0-106 ft (0-32.3 m), perforated 20-106 ft (6.10-32.3 m), diameter 10 in (10.25 m) 106-140 ft (32.3-42.7 m), cased 10 in (0.25 m) 106-140 ft (32.3-42.7 m), perforated 106-140 ft (32.3-42.7 m). Depth 140 ft (42.7 m) . DATUM.--Elevation of land-surface datum is about 13.0 ft (3.96 m) above mean sea level, from topographic map. Measuring point: Hole on side of casing, 1.80 ft (0.55 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--October 1985 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 9.38 ft (2.86 m) below land-surface datum, June 23, 1987; lowest water level recorded, 14.72 ft (4.49 m) below land-surface datum, Apr. 28, 1986. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 INSTANTANEOUS OBSERVATION AT 1200 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 LOW HIGH OCT 10.85 10.85 10.89 10.89 10.97 10.99 11.05 11.15 11.12 11.14 11.18 11.29 11.34 11.36 11.39 11.41 11.40 11.45 11.49 11.48 11.51 11.50 11.47 11.47 11.54 NOV 11.67 11.66 11.70 11.77 11.78 11.80 11.76 11.71 11.70 11.69 11.72 11.71 11.69 11.74 11.71 11.80 11.90 12.01 12.09 11.86 11.95 11.99 12.03 12.05 12.05 DEC 12.26 12.29 12.32 12.33 12.35 12.38 12.37 12.42 12.49 12.53 12.57 12. 62 12.65 12.69 12.74 12.75 12.77 12.79 12.81 12. 83 12.86 12.90 12.92 12.94 12.98 JAN 12.93 12.97 13.16 13.21 13.22 13.24 13.26 13.29 13.37 13.42 13.36 13.21 13.21 13.39 13.43 13.47 13.37 13.34 13.27 13.14 13.09 12.82 13.07 13.08 12.93 FEB 13.05 12.96 12.94 12.94 12.97 12.99 13.01 12.96 12.91 12.79 12.88 12.90 12.95 12.96 12.97 12.99 12.99 12.99 12.98 12.99 12.99 12.96 12.92 12.89 12.88 MAR 12.93 12.96 13.00 13.03 13.09 13.12 13.14 13.18 13.17 13.23 13.17 13.02 12.88 12.70 12.66 12.65 12 .57 12.59 12.50 12.34 12.50 12.54 12.56 12.59 12.62 APR 12.63 12.65 12.58 12.56 12.58 12.70 12.76 12.79 12.83 12.88 12.70 12.89 12.91 12.87 12.86 12.87 12.90 12.93 12.96 12.96 12.97 12.96 12.98 13. 02 13.05 MAY 13.12 13.12 13.14 13.16 13.19 13.21 13.24 13.26 13.14 12.95 12.92 12.90 12.88 12.86 12.87 12.89 12.90 12.88 12.90 12.90 12.92 12.93 12.99 13.03 13.07 JUN 13.94 13.96 13.98 13.98 13.95 13.78 13.87 13.81 13.77 13.76 13.75 13.75 13.75 13.77 13.65 13.63 13.63 13.64 13. 67 13.61 13.75 13.75 13.90 13.93 13.91 JUL 14 .15 14.16 14.18 14.21 14.25 14.25 14.25 14.18 14.16 14.06 14.06 14.08 14.10 14.12 14.11 14.10 14.27 14.28 14.27 13.70 13.59 14.28 14.36 14.35 13.99 AUG 14.42 14.44 14.14 14.08 13.55 13.41 13.42 13.41 13.31 13.27 13.11 13.22 13.20 13.09 13.10 13.12 13.14 13.12 12.98 12.98 13.01 13.01 12.99 13.02 13.04 SEP 13.22 13.25 13.25 13.25 13.24 13.17 13.17 13.17 13.17 13.18 13.22 13.24 13.27 13.27 13.26 13.27 13.28 13.28 13.27 13.25 13.26 13.29 13.31 13.34 13.37 11.60 11.66 11.74 11.77 11.71 11.66 12.08 12.17 12.19 12.21 12.23 _-- 12.98 13.01 13.04 12.99 12.97 12.97 12.84 12.84 12.82 12 .79 12.70 12.85 12.88 12.88 12. 90 -_- -__ ___ 12.65 12.64 12.65 12.65 12.65 12.57 12.97 12.86 12.92 13.06 13.11 13.60 13.67 13.72 13.78 13.82 13.86 13.90 13.91 13.94 14.03 14.11 ___ 14.18 14.21 14.26 14.30 14.35 14 .40 13.01 13.02 13.06 13.09 13.13 13.18 13.40 13.43 13.43 13.48 13.50 --- 11.77 10.85 12.23 11.66 13.04 12.26 13.47 12 .70 13.05 12.79 13.23 12 .34 13.11 12.56 13.86 12.86 14.11 13. 61 14 .40 13.59 14.44 12.98 13.50 13.17 WTR YR 1990 MEAN 12.95 LOW 14.44 HIGH 10.85 WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM •3 tn ijj ^ (O ^J J X W \JI f II \n 1 ^ \A V \>A f\ 1 k s 3^y i\\ 'X\ -f w ^ V,, ^ -4 /• ONDJFMAMJJASONDJFMAMJJASONDJFMAMJJAS 1987 1988 1989 1990 GROUND-WATER LEVELS RIO DE LA PLATA BASIN 435 182655066142400. Local number, 217. LOCATION.--Lat 18°26'55", long 66°14'24". Owner: U.S. Geological Survey. Name: Monserrate TW-2. AQUIFER.-Alluvial Deposits. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 4 in (0.10 m), cased 4 in (0.10 m) 0-80 ft (0-24.4 m), perforated 10-80 ft (3.05-24.4 m) . Depth 80 ft (24.4 m) . DATUM.--Elevation of land-surface datum is about 3.30 ft (1.00 m) above mean sea level, from topographic map. Measuring point: Top of shelter floor, 3.50 ft (1.07 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.—November 1985 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 0.02 ft (0.006 m) below land-surface datum. May 16, 1986; lowest water level recorded, 2.20 ft (0.67 m) below land-surface datum, July 5, 1990. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 INSTANTANEOUS OBSERVATION AT 1200 DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 LOW HIGH OCT .71 .76 .84 .79 .86 .88 .83 .84 .87 .85 .86 .87 .94 .90 .89 .94 .95 1.01 1.10 1. 10 1.11 1.08 1.02 .96 1.00 1.01 1.10 1.11 1.11 1.05 .94 1.11 .71 NOV .89 .97 1.01 1.09 1.06 1.00 .96 .94 .94 .97 1.01 1.03 1.10 1.08 1.10 1.14 1.17 1.21 1.24 1.22 1.19 1.18 1.19 1.22 1.27 1.29 1.34 1.39 1.39 1.39 1.39 .89 DEC 1.37 1.39 1.39 1.40 1.38 1.36 1.38 1.41 1.43 1.45 1.50 1.53 1.56 1.58 1.59 1.56 1.56 .57 .58 1. 1. 1.58 1.62 1.65 1.67 1.70 1.76 1.74 1. 62 1.78 1.36 JAN 1.59 1.60 1.61 1.65 1.71 1.74 1.75 1.78 1.82 1.81 1.76 1.76 1.78 1.77 1.76 1.66 1.62 1.63 1.65 1.64 1.63 .60 ,63 ,61 ,59 ,56 1.55 1.82 1.55 59 63 63 ,63 1.68 1.64 1.65 1.55 1.51 1.50 1.51 1.51 1.57 1.57 1.60 1.65 1.67 1.65 1.63 1.66 65 58 56 52 50 1.48 1.47 1.48 1.68 1.47 MAR 1.50 1.55 1.63 1.66 1.70 1.74 1.74 1.75 1.75 1.73 APR 72 ,63 ,56 ,46 ,44 ,46 ,42 1.47 1.48 1.45 1.45 1.46 1.49 1.48 1.48 1.53 1.51 1.51 1.49 1.49 1.50 1.75 1.42 1. 1. 1. 1. 1. 1. 1. 1. 1. 1. 51 51 53 49 52 57 61 63 69 72 1.73 1.74 73 72 72 74 1.76 1.77 1.77 1.79 1.81 1.83 MAY 1.79 1.75 1.76 1.77 1.79 ,82 ,84 ,80 1.66 ,66 ,72 1.71 1.70 1.75 1.76 1.77 1.75 1.74 1.74 1.74 1.76 1.76 1.76 1.78 JUN 2.03 2.05 1.98 1.98 1.99 2.03 JUL 2.02 2.13 2.15 2.16 2.18 2.14 2.16 2.07 2.03 2.01 2.02 2.03 2.13 2.15 2.04 2.13 2.17 2.18 2.15 2.14 2.00 2.00 2.08 1.95 1.78 83 ,83 .87 .93 ,97 1.95 1.66 2.00 2.18 1.78 AUG 2.01 2.11 1.95 1.88 1.76 1.74 1.74 1.75 1.80 1.72 1. 68 1.70 1.71 1.68 1.69 1.71 1.70 1.67 1.55 1.55 1.55 1.54 1.54 1.61 1.65 1.67 1.69 1.70 1.69 1.71 1.73 2.11 1.54 SEP 1.77 1.78 1.71 1.70 1.71 1.69 1.68 1.71 1.73 1.79 1.84 1.83 1.86 1.81 1.76 1.75 1.76 1.75 1.73 1.72 1.70 1.72 1.75 1.84 1.88 1.90 1.93 1.92 1.92 1.92 1.93 1.68 _< 0.5 1 1.5 2 S" 2.5 £ V^ A \ IT rfft ONDJ FMAMJJ ASONDJ Ff/AMJJ ASONDJ FMAMJJAS 1987 1988 1989 1990 436 GROUND-WATER LEVELS RIO HONDO TO RIO PUERTO NUEVO BASINS 182623066111000. Local number, 218. LOCATION.--Lat 18°26'23", long 66°11'10". Owner: P.R. Aqueduct and Sewer Authority. Name: Levittown No. 7. AQUIFER.--Alluvial deposits-Aymamon Limestone. WELL CHARACTERISTICS.--Drilled water-table well. DATUM.--Elevation of land surface datum is about 10.0 ft (3.05 m) above mean sea level, from topographic map. Measuring point: Hole on pump base, 1.55 ft (0.47 m) above land-surface datum. REMARKS.--Recording observation well. Water levels affected by nearby pumping well. PERIOD OP RECORD.—October 1985 to current year. EXTREMES FOR PERIOD OP RECORD.--Highest water level recorded, 5.94 ft (1.81 m) below land-surface datum, Sept. 20, 1989; lowest water level recorded, 9.77 ft (2.98 m) below land-surface datum, Mar. 23, 1986. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 INSTANTANEOUS OBSERVATION AT 1200 NOV DEC JAN DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 LOW HIGH WTR YR 1990 MEAN 8.31 LOW 9.18 HIGH 6.89 APR JUN JUL SEP 7.16 7.16 7.19 7.17 7.17 7.20 7.25 7.27 7.27 7.30 7.31 7.35 6.89 7.35 7.38 7.36 7.40 7.47 7.51 7. 10 7.59 7.58 7.57 7.57 7.57 7.58 7.62 7.65 7. 62 7.61 7.61 7.65 6.89 7.57 7.60 7.63 7.68 7.68 7.64 7.53 7.60 7.61 7.51 7.56 7.54 7.54 7.52 7.27 7.55 7.71 7.85 7.97 7.86 7.90 7.91 7.97 7.97 8.01 8.03 8.03 8.07 8.10 8.10 --- 8.10 7.27 8.11 8.17 8.18 8.17 7.63 8. 19 7.78 8.22 8.27 8.25 8.23 8.26 8.30 8.37 8.41 8.41 8.43 8.43 8.45 8.45 8.49 8.54 8.55 8.54 8.54 8.55 8.58 8.57 8.56 8. 56 8. 57 8. 58 7.63 8.52 8.53 8.53 8.55 8.58 8.59 8.58 8.60 8.60 8.60 8.63 8.63 8.65 8.66 8.67 8.66 8.66 8.66 8.64 8.63 8.61 8.57 8.52 8.49 8.49 8.50 8.56 8.56 8.51 8.52 8.52 8.67 8.49 8.55 8.58 8.65 8.64 8.60 8.59 8.59 8.53 8.56 8.59 8.58 8.55 8.55 8.57 8. 60 8. 64 8. 68 8. 68 8.69 8.68 8. 63 8. 61 8.47 8.60 8.58 8.51 8.52 8.52 ___ __- --- 8.69 8.47 8.55 8.60 8.66 8.67 8.66 8.68 8.68 8.69 8.69 8.73 8.77 8.65 8.63 8.59 8.59 8.22 8.52 8.58 8.52 8.49 8.50 8.52 8.49 8.53 8.53 8.56 8.53 8.55 8.18 8.56 8.59 8.77 8.18 8.61 8.56 8.54 8.51 8.51 8.58 8. 63 8.62 8.63 8.67 8.68 8.68 8.68 8. 66 8. 63 8.66 8. 68 8.70 8.66 8.67 8.72 8.73 8.70 8.74 8.31 8.73 8.78 8.84 8.85 8. 83 --- 8. 85 8.31 8.79 8.81 8.44 8.84 8.88 8.89 8.87 8.86 8.82 8.63 8.80 8.79 8.77 8.72 8.73 8.70 8.69 8.33 8.03 8.00 8.04 8.02 8.02 7.89 8.02 8.12 8.18 8.22 8.25 8.29 8.32 8.89 7.89 8.38 8.40 8.42 8.41 8.38 8.22 8.30 8.33 8.32 8.31 8.31 8.29 8.26 8.13 8.24 8.27 8.26 8.28 8.29 8.19 8.32 8.35 8.36 8.32 8.34 8.35 8.36 8.39 8.40 8.42 8.42 8.13 8.44 8.45 8.48 8.49 8.49 8.50 8.50 8.49 8.48 8.45 8.30 8.48 8.50 8.50 8.50 8.50 9.18 8.76 8.64 8.54 8.59 8.56 8.52 8.46 8.42 8.40 8.40 8.42 8.44 8.47 8.50 9.18 8.30 8.52 8.54 8.46 8.48 8.44 8.23 8.39 8.38 8.39 8.35 8.35 8.35 8.22 8.34 8.34 8.34 8.32 8.28 8.24 8.20 8.18 8.15 8.14 8.18 8.22 8.22 8.22 8.22 8.23 8.24 8.25 8.54 8.14 8.28 8.27 8.24 8.22 8.20 8.18 8.18 8.22 8.25 8.27 8.31 8.31 8.35 8.34 8.35 8.33 8.29 8.28 8.25 8.22 8.21 8.26 8.27 8.31 8.34 8.35 8.38 8.22 8.42 8.42 --- 8.42 8.18 UJ Q HUJ ^o 4l iJl \ ONDJFMAM 1987 1988 JJ ASONDJFMA 1989 MJJASONDJFfcAM 1990 JJAS GROUND-HATER LEVELS RIO HONDO TO RIO PUERTO NUEVO BASINS 437 182441066082600. Local number, 219. LOCATION.--Lat 18°24'41", long 66°08'26". Owner: Department of Defense. Name: Ft. Buchanan No. 1, Buchanan Park well. AQUIFER.--Cibao Formation. WELL CHARACTERISTICS.--Drilled water-table well, diameter 10 in (0.25 m), cased 10 in (0.25 m) 0-270 ft (0-82.3 m), perforated 46-685 ft (14.0-20.7 m) , 88-120 ft (26.8-36.6 m), 160-191 ft (48.8-58.2 m) , 240-270 ft (73.2-82.3 m) Depth 270 ft (82.3 m). DATUM.--Elevation of land-surface datum is about 66.0 ft (20.1 m) above mean sea level, from topographic map. Measuring point: Hole on side of casing, 0.75 ft (0.23 m) above land-surface datum. Prior June 30, 1986, top of shelter floor, 3.59 ft (1.09 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.—December 1985 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 34.97 ft (10.66 m) below land-surface datum, Nov. 12, 13, 14, 1989; lowest water level recorded, 43.32 ft (13.20 m) below land-surface datum. Mar. 15, 1987. HATER LEVEL, IN FEET BELOH LAND-SURFACE DATUM, HATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 INSTANTANEOUS OBSERVATION AT 1200 DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 LOH HIGH OCT 35.66 35.68 35.71 35.73 35.78 35.85 35.84 35.83 35.86 35.91 35.97 36.02 36.05 36.04 36.04 35.90 35.82 35.84 35.88 35.89 35.93 35.92 35.80 35.75 35.75 NOV 35.68 35.55 35.56 35.57 35.47 35.32 35.23 35.19 35.13 35.10 35.04 35.00 35.00 34.99 35.00 35.01 35.08 35.20 35.32 35.33 35.36 35.49 35.57 35.65 35.71 DEC 36.16 36.28 36.32 36.37 36.54 36.69 36.85 36.98 37.09 37.14 37.24 37.36 37.46 37.54 37.68 37.74 37.88 37.99 38.12 38.23 38.33 38.47 38.53 38. 61 38.72 JAN 38.98 38.92 38.92 38.95 39.01 39.05 39.08 39.15 39.24 39.31 39.35 39.42 39.52 39.63 39.76 39.83 39.88 39.99 40.02 40.00 39.91 39.87 39.89 39.87 39.84 35.77 35.83 35.87 35.91 35.94 35.84 35.75 35.82 35.92 35.98 36.05 ___ 38.82 38.91 38.95 38.97 39.05 39.08 39.88 39.89 39.84 39.78 39.79 39.89 FEB 39.95 40.06 40.15 40.17 40.17 40.25 40.34 40.36 40.38 40.35 40.32 40.33 40.39 40.41 40.37 40.35 40.33 40.30 40.22 40.17 40.21 40.22 40.16 40.14 40.11 MAR 40.25 40.31 40.33 40.35 40.42 40.47 40.49 40.54 40.65 40.70 40.64 40.48 40.29 40.12 40.05 40.02 39.99 39.98 40.02 40.07 40.12 40.18 40.24 40.30 40.36 APR 40.53 40.57 40.61 40.65 40.76 40.88 40.97 41.01 41.04 41.08 41.11 41.19 41.25 41.26 41.25 41.25 41.32 41.41 41.47 41.50 41.51 41.51 41.56 41.65 41.70 MAY 41.98 42.04 42.14 42.17 42.21 42.23 42.31 42.38 42.15 41.87 41.72 41.45 41.30 41.08 40.98 40.94 40.92 40.88 40.86 40.84 40.85 40.88 40.91 40.97 41.01 JUN 41.35 41.38 41.38 41.34 41.29 41.11 41.02 41.02 41.06 41.16 41.19 41.25 41.32 41.39 41.41 41.39 41.40 41.39 41.40 41.47 41.54 41.56 41.59 41. 62 41. 69 JUL 41.93 41.97 42.03 42.08 42.11 42.14 42.20 42.24 42.27 42.29 42.36 42.50 42.55 42.53 42.53 42.59 42.58 42.60 42.62 42.66 42.71 42.71 42.71 42.63 42.50 AUG 42. 60 42.61 42.63 42.64 42.67 42.67 42.67 42.71 42.76 42.80 42.86 42.92 42.92 42.85 42.82 42.84 42.87 42.90 42.94 42.98 43.00 43.06 43.14 43.22 43.27 40.14 40.17 40.21 ___ ___ ___ 40.42 40.43 40.48 40.50 40.53 40.53 41.74 41.81 41.86 41.89 41.93 ___ 41.03 41.04 41.08 41.17 41.24 41.31 41.72 41.74 41.79 41.84 41.91 --- 42.40 42.38 42.39 42.44 42.49 42.56 43.27 43.25 43.28 43.35 43.39 43.45 SEP 43.48 43.48 43.51 43.48 43.49 43.38 43.27 43.15 43.00 42.80 42.72 36.05 35.66 36.05 34.99 39.08 36.16 40.02 38.92 40.41 39.95 40.70 39.98 41.93 40.53 42.38 40.84 41.91 41.02 42.71 41.93 43.45 42.60 34 38 42 / V A/ \\ v^ /- V. A-- Jr r- V-- -s ,xs '\ A f 1 J ^ ^ \\ \> ^ -A v r •t \ xr ONDJ FMAMJ J ASOND J FMAMJ J ASONDJ FvAMJ J A S 1987 1988 1989 1990 438 GROUND-WATER LEVELS RIO HONDO TO RIO PUERTO NUEVO BASINS 182413066044000. Local number, 220. LOCATION.--Lat 18°24'13", long 66°04'40". Owner: P.R. Aqueduct and Sewer Authority. Name: Parque San Luis Rey-Americo Miranda AQUIFERI.--Surf icial Deposits-Cibao Formation. WELL CHARACTERISTICS.--Drilled unused artesian well, diameter 10 in (0.25 m) , cased 8 in (0.20 m) 0-166 ft (0- 50.6 m), perforated 39-166 ft (11.9-50.6 m) . Depth 166 ft (50.6 m). DATUM.--Elevation of land-surface datum is about 16.4 ft (5.0 m) above mean sea level, from topographic map. Measuring point: Top of shelter floor, 3.00 ft (0.91 m) above land-surface datum. REMARKS.--Recording observation well. Water levels affected by nearby pumping well. PERIOD OF RECORD.--February 1986 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, +2.99 ft (+0.91 m) above land-surface datum, Feb. 6, May 8-9, 1986; lowest water level recorded, 6.48 ft (1.98 m) below land-surface datum, Oct. 26, 1989 WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 INSTANTANEOUS OBSERVATION AT 1200 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 LOW HIGH WTR YR 1990 MEAN .96 LOW 6.48 HIGH +.30 OCT 3.35 3.48 3.82 4.08 4.10 4.26 4.35 4.46 4.49 4.68 4.83 4.95 4.99 4.98 4.84 4.70 4.81 4. 89 4.95 5.00 4.93 4.95 4.82 4.76 3.70 6.48 5.46 4.46 3.45 2.45 2.29 6.48 2.29 NOV 2.09 1.94 1.84 1.79 1.68 1.65 1.62 1.50 1.44 1.37 1.33 1.32 1.33 1.38 1.43 1.45 1.48 1.46 1.43 1.34 2.25 1.28 1.14 1.07 1.01 .97 .95 .90 .93 1.43 2.25 .90 DEC 1.04 .96 .93 .90 .90 .90 .95 1.05 1.15 1.23 1.32 1.40 1.47 1.54 1.60 1.61 1.64 1.67 1.70 1.74 1.78 1.82 1.86 1.88 1.90 1.93 1.96 1.96 1. 90 1.87 1.87 1.96 .90 JAN 1.77 1.74 1.75 1.76 1.78 1.81 1.82 1.85 1.82 1.74 1.65 1.58 1.52 1.48 1.43 1.36 1.33 1.28 1.17 .98 .91 .86 .85 .75 .70 .24 .10 .04 + .01 + .02 + .02 1.85 + .02 FEB + .01 .08 .23 .36 .47 .59 .69 .90 .92 .91 .92 .96 1.03 1.05 1.17 3.33 2.50 2.05 1. 82 1. 68 1.62 1.57 1.52 1.51 1.49 1.49 1.53 1.53 ___ ___ --- 3.33 + .01 MAR 1.50 1.49 1.45 1.34 1.22 1.10 1.00 .94 .83 .71 .58 .38 .13 + .03 + .12 + .22 + .27 + .28 + .28 + .30 + .27 + .25 + .28 + .28 + .23 + .22 + .23 + .23 + .22 + .24 + .24 1.50 + .30 APR .22 .22 .19 .18 .12 .08 .05 .02 . 01 .03 .03 .04 .01 + .01 + .03 + .02 + .01 + .06 + .06 + .07 + . 07 + .07 + .05 + .01 + . 04 + .04 + .01 .03 .05 .06 --- .06 + .22 MAY .04 .04 .08 .10 .12 .14 .26 .43 .42 .34 .42 .47 .53 .53 .58 .65 .72 .75 .81 .87 .94 + .01 .09 .21 .32 .41 .49 .59 .68 .76 .71 .94 + .01 JUN .63 .51 .41 .33 .19 .07 + .02 + .08 + .08 + .09 + .15 + .17 + .15 + .13 + .21 + .24 + .26 + .26 + .25 + .21 + .15 + .10 + .11 + .09 + .10 + . 08 + .07 + .05 + .04 + .02 --- .63 + .26 JUL + .03 + .01 .02 .03 .04 .00 .00 .02 .03 .05 .05 .08 .09 .08 .09 .11 .08 .09 .08 .10 .13 .15 .15 .10 .03 .00 .00 + .17 + .21 + .22 + .20 .15 + .22 AUG + .19 + .18 + .18 + .15 + .13 + .12 + .10 + .09 + .06 + .07 + .09 + .08 + .09 + .16 + .19 + .17 + .15 + .14 + .10 + .09 + .06 + .07 + .08 .00 .16 .29 .42 .55 .68 .81 .94 .94 + .19 SEP 1.05 1.14 1.21 1.30 1.37 1.36 1.37 1.22 1.04 .84 .70 .64 .68 .75 .84 .92 1.01 1.08 1.11 1.18 1.25 1.30 1.30 1.18 1.05 .94 .87 .79 .73 .67 __ _ 1.37 .64 -J-S. '* UJ^ cog LJ O z§ ^J (/) 4. jo P 7 K ^ j •^ x//^^ •^N -J\n-*\--^^ -•^ ^^s, V-s, -x, ---J \J*~ I 4\JV I ' v.-. r_, N £ ONDJFMAMJJASONDJFMAMJJASONDJFMAMJJAS 1987 1988 1989 1990 + Above land-surface datum. GROUND-WATER LEVELS RIO HONDO TO RIO PUERTO NUEVO BASINS 439 182436066031200. Local number, 221. LOCATION.--Lat 18°24'36» / long 66°03'12". Owner: P.R. Highway Authority Name: Hyde Park TW-10. AQUIFER.--Surficial Deposits-Cibao Formation. WELL CHARACTERISTICS.--Drilled water-table well, diameter 4 in (0.10 m), cased 4 in (0.10 m) 0-107 ft (0-32.6 m), perforated 19-107 ft (5.79-32.6 m) . Depth 107 ft (32.6 m) . DATUM.--Elevation of land-surface datum is about 82.0 ft (25.0 m) above mean sea level, from topographic map. Measuring point: Hole on side of casing, 0.70 ft (0.21 m) above land-surface datum. Prior July 28, 1986, top of shelter floor, 3.14 ft (0.96 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--December 1985 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 0.62 ft (0.19 m) below land-surface datum, Sept. 18, 1989; lowest water level recorded, 15.59 ft (4.75 m) below land-surface datum, Apr. 5, 1986. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 INSTANTANEOUS OBSERVATION AT 1200 DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 LOW HIGH OCT 5.67 5.81 6.00 6.11 6.28 5.99 6.07 6.14 6.00 6.18 6.34 6.47 6.55 6.60 6.42 6.23 6.31 6.43 6.51 6.54 6.63 6.53 6.27 6.33 6.46 6.57 6.72 6.81 6.89 6.90 6.94 6.94 5.67 NOV 6.86 6.89 .00 .00 7. 7. 6.83 6.68 6.52 5.83 47 5.61 5.66 5.80 5.94 5.97 6.06 6.28 6.42 6.21 6.25 6.32 6.38 6.53 6.63 6.71 6.78 6.84 6.94 7.00 7.06 7.13 7.13 5.47 DEC 7.22 7.29 7.34 7.39 7.44 7.49 7.56 7.61 7.67 7.72 7.78 7.83 .88 .96 7. 7. 8.03 8.07 8.08 8.14 8.19 8.27 8.37 8.43 8.50 8.57 8.67 8.75 8.82 8.87 8.53 8.47 8.51 8.87 7.22 JAN 8.35 8.35 8.41 8.51 8.64 8.75 8.83 8.93 9.01 9.07 9.02 9.02 9.18 9.32 9.22 9.17 9.12 9.10 8.71 8.28 7 .98 7.99 8.04 7.42 7.32 7.35 7.47 .54 ,63 ,67 7. 7, 7, 7.74 FEB 7.79 7.84 7.74 7.62 7.66 7.74 7.83 7.58 7.46 7.19 7.15 7.20 7.30 7.26 7.31 7.60 7.65 7.65 7.70 7.73 7.79 9.32 7.32 7.97 7.15 MAR 8.01 8.03 8.11 8.21 8.31 8.42 8.49 8.63 8.64 8.38 8.34 7.44 6.88 6.47 6.53 6.52 6.47 6.58 6.72 6.84 6.93 7.04 7.11 7.21 7.30 7.36 7.37 7.44 7.45 7.53 7.42 8.64 6.47 APR 7.54 7.63 7.71 7.79 7.90 8.02 8.12 8.24 8.37 8.48 8.56 8.65 8.38 8.14 8.14 8.17 8.25 8.38 8. 01 8.00 8.08 8.17 8.27 8.39 8.45 8.45 8.48 8.62 8.72 8.80 8.80 7.54 MAY 8.90 8.89 8.88 8.98 9.07 9.23 9.42 9.55 8.57 8.11 7.85 7.78 7.78 7.42 7.38 7.40 7.42 7.43 7.45 7.48 7.55 7.58 7.61 7.63 7.66 7.68 7.72 7.75 7.76 7.79 7.82 9.55 7.38 JUN 7.84 7.88 7.90 7.92 7.96 8.03 8.05 8.06 8.08 8.10 8.12 8.14 8.16 8.18 8.20 8.22 8.24 8.26 8.27 8.29 8.31 8.33 8.45 8.58 7.99 7.99 8.04 8.14 8.32 8.54 8.58 7. 84 JUL 8.69 8.85 9.04 9.25 9.36 9.35 9.26 9.27 9.46 9.62 9.74 9.85 10.03 10.13 10.25 10.37 10.53 10.05 9.61 9.61 9.62 9.83 10.08 9.90 9.35 8.61 8.61 7.79 7.79 7.85 7.93 10.53 7.79 AUG 8.02 8.14 8.21 8.33 8.43 8.45 8.68 8.76 8.97 9.03 9.01 9.01 8.18 7.96 7.97 8.09 8.23 8.30 8.32 8.49 8.63 8.76 8.90 8.90 8.90 8.86 8.86 8.89 9.02 9.22 9.42 9.42 7. 96 SEP 9.65 9.86 10.03 10.01 9.00 8.00 7.63 7.17 7.22 7.26 7.31 7.31 7.37 6.33 6.46 6.57 6.67 6.75 6.77 6.87 6.97 6.93 96 04 6 7 7.13 7.25 7.33 7.39 7.46 7.52 10.03 6.33 WTR YR 1990 MEAN 7.86 LOW 10.53 HIGH 5.47 10 trk ^ fc *3 Vws XV ^\N Vsr ONDJFMAMJJASOMDJFMA MJJASONDJFMAMJJAS 1987 1988 1989 1990 440 GROUND-WATER LEVELS RIO HONDO TO RIO PUERTO NUEVO BASINS 182511066045401. Local number, PN-2. LOCATION.--Lat 18°25'11, long 66°04'54". Owner: U.S. Geological Survey, WRD. Name: La Esperanza No. 2. AQUIFER.--Alluvium. WELL CHARACTERISTICS.--Drilled observation well, diameter 4 in (0.10 m) , cased 4 in (0.10 m) , 0-40 ft (0-12.2 m) , perforated 30-40 ft ((9.15-12.2 m) . Depth 40 ft (12.2 m) . DATUM.--Elevation of land-surface datum is about 13 ft (3.96 m) above mean sea level, from topographic map. Measuring point: Hole on well shaft, 3.17 ft (0.97 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OP RECORD.--July 1989 to current year. EXTREMES FOR PERIOD OP RECORD.--Highest water level recorded, 8.26 ft (2.52 m) below land-surface datum, Sept. 25, 1989; lowest water level recorded, 10.95 ft (3.34 m) below land-surface datum, Jan. 14-15, 1990. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 INSTANTANEOUS OBSERVATION AT 1200 DEC JAN FEB APR JUN JUL AUG SEP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 LOW HIGH 8.53 8.60 8.70 8.78 8.90 9. 01 9.09 9.17 9.15 9.20 9.26 9.33 9.41 9.45 9.22 8.95 8.81 8.79 8.83 8.89 8.98 9.05 8.91 8.86 8.85 8.92 9.00 9.09 9.18 9.22 9.19 9.45 8.53 9.19 9.18 9.18 9.19 9.08 8.89 8.81 8.78 8.59 8.44 8.39 8.40 8.45 8.54 8.63 8.68 8.81 8.86 8.95 9.02 9.03 9.11 9.18 9.25 9.35 9.40 9.47 9.55 9.63 9.70 --- 9.70 8.39 9.76 9.83 9.89 9. 94 10.00 10. 05 10.11 10.15 10.20 10.27 10.31 10.38 10.42 10.48 10.55 10.57 10.51 10.53 10.49 10.49 10.52 10.58 10.64 10.68 10.74 10.79 10.85 10.88 10.84 10.71 10.68 10. 88 9.76 10.56 10.48 10.49 10.54 10.59 10.66 10.72 10.78 10.84 10.90 10.93 10.89 10.90 10.94 10.92 10.88 10.82 10.81 10.69 10.57 10.31 10.25 10.27 10.16 9.96 9.93 9.99 10.04 10.08 10.09 10.10 10.94 9.93 10.13 10.18 10.19 10.13 10.13 10.18 10.28 10.27 10.23 10. 04 9.87 9.82 9.89 9.94 9.82 9.85 9.91 9.88 9.80 9.80 9.85 9.82 8.92 8.90 8.93 8.98 9.02 9.06 ___ ___ --- 10.28 8.90 9.09 8.97 8.97 9.03 9.09 9.19 9.24 9.32 9.41 9.34 9.32 9.01 8.69 8.41 8.36 8.39 8.33 8.37 8.45 8.57 8.58 8.66 8.70 8.83 8.94 9.09 9.19 9.21 9.23 9.26 9.16 9.41 8.33 9.18 9.29 9.38 9.51 9.64 9.76 9.84 9.94 10.00 10. 08 10.14 10.18 10.21 10.04 10.05 10.03 10.06 10.14 10.12 10.07 10.06 10.11 10.16 10.24 10.26 10.08 10.09 10.10 10.17 10.25 --- 10.26 9.18 10.35 10.29 10.30 10.33 10.38 10.42 10.51 10.58 10.16 9.74 9.42 9.35 9.33 9.17 8.98 8.99 9.08 9.13 9.11 9.19 9.29 9.40 9.48 9.58 9.70 9.82 9.89 9.97 10.07 10.15 10.24 10.58 8.98 10.24 10.26 10.26 10.29 10.37 10.01 9.89 9.86 9.89 9.99 9.88 9.88 9.93 9. 99 9. 97 9.70 9.71 9.54 9.49 9.52 9.60 9.71 9.83 9.92 9.83 9.81 9.84 9.91 9. 97 10.07 --- 10.37 9.49 10.14 10.17 10.27 10.34 10.37 10.42 10.35 10.35 10.39 10.43 10.48 10.58 10.60 10.64 10.70 10.70 10.76 10.68 10.61 10.63 10.68 10.72 10.76 10.77 10.26 10.10 10.08 9.69 9.52 9.50 9.59 10.77 9.50 9.69 9.78 9.85 9.91 10.01 10.04 10.09 10.14 10.19 10.25 10.07 10.03 10. 07 9. 68 9.50 9.47 9.50 9.53 9.48 9.51 9.58 9.70 9.76 9.77 9.84 9.80 9.80 9.84 9.87 9. 94 10.04 10.25 9.47 10.13 10.20 10.28 10.32 10.36 10.09 9.97 9.69 9.65 9.58 9.58 9.58 9.61 9.42 9.31 9.34 9.35 9.45 9.45 9.49 9.54 9.61 9.65 9.69 9.78 9.86 9.96 10.03 10.12 10.20 --- 10.36 9.31 WTR YR 1990 MRAN 9.77 LOW 10.94 HIGH 8.33 UjQ Kg 12 -«A ^ AUG SEP OCT NOV DEC JAN FE8 MAR APR MAY JUN JUL AUG SEP 1989 1990 GROUND-WATER LEVELS RIO HONDO TO RIO PUERTO NUBVO BASINS 441 182435066052700. Local number, PN-5. LOCATION.--Lat 18°24'35", long 66°05'27". Owner: U.S. Geological Survey, WRD. Name: Salud Mental No. 1. AQUIFER.--Alluvium. WELL CHARACTERISTICS.--Drilled water-table well, diameter 4.0 in (0.10 m), cased 4.0 in (0.10 m), 0-83 ft (0-25.3 m), perforated 73-83 ft (22.2-25.3 m) . Depth 83 ft (25.3 m) . DATUM.--Elevation of land-surface datum is about 85 ft (25.9 m) above mean sea level, from topographic map. Measuring point: Hole on well shaft, 2.85 ft (0.87 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--April 1989 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 26.20 ft (7.98 m) below land-surface datum, Nov. 21-22, 1989; lowest water level recorded, 29.38 ft (8.95 m) below land-surface datum. May 30, 1989. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 INSTANTANEOUS OBSERVATION AT 1200 NOV JAN FEB MAR APR JUL AUG 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 LOW HIGH 26.30 26.31 26.31 26.30 26.28 26.26 26.25 26.22 26.21 26.22 26.24 26.26 26.28 26.31 26.29 26.27 26.27 26.31 26.32 26,33 26.35 26.38 26.37 26.38 26.40 26.36 26.45 26.52 26.57 26.58 26.61 26.61 26.21 26.60 26.59 26.59 26.59 26.59 26.58 26.57 26.57 26.56 26.55 26.51 26.45 26.40 26.38 26.34 26.31 26.29 26.25 26.24 26.23 26.21 26.33 26.39 26.38 26.38 26.37 26.36 26.36 26.36 26.36 --- 26.60 26.21 26.36 26.37 26.38 26.39 26.39 26.40 26.43 26.45 26.47 26.51 26.53 ___ 26.60 26.60 26.60 26.60 26.60 26.61 26.63 26.64 26.68 26.80 26.82 26.86 26.87 26.91 26.92 26.94 27.00 27.03 27.05 ___ ___ 27.06 27.07 27.08 27.14 27.19 27.20 27.23 27.29 27.35 27.38 27.41 27.48 27.48 27.51 27.52 27.53 27.57 27.57 27.57 27.57 27.57 27.57 27.58 27.58 27.58 27.59 27.60 27 .60 27.60 27.60 27.60 27.60 27.06 27.60 27.60 27.60 27.60 27.58 27.58 27.58 27.59 27.59 27.59 27.59 27.60 27.60 27.60 27.60 27.60 27.61 27.61 27. 61 27.61 27.62 27.62 27.62 27.63 27.63 27.64 27.64 27.65 ___ ___ --- 27.65 27.58 27.65 27.69 27.69 27.70 27.70 27.71 27.71 27.72 27.76 27 .77 27.77 27.78 27.78 27.79 27.79 27.80 27.76 27.77 27.78 --- ___ ___ ___ --- ___ .__ ___ ___ --- ___ ___ —— ___ --- 27.40 27.43 27.45 27.48 27.50 27.52 27.55 27.58 27.59 27.62 ___ 27.73 27.74 27.75 27.77 27.80 27.82 27.84 27.88 27.87 27.88 27.92 27.94 27. 98 28.00 --- ___ ___ 28.01 28.06 28.08 28.09 28.09 28.12 28.17 28.20 28.15 28.12 28.12 28.12 28.12 28.09 28.08 28.08 28.08 28.08 28.08 28.08 28.06 28.05 28.05 28.05 28.06 28.07 28.07 28.09 28.12 28.17 28.19 28.20 28.01 28.23 28.24 28.29 28.32 28.33 28.28 28.30 28.31 28.33 28.34 28.34 28.36 28.36 28.37 28.37 28.38 28.39 28.41 28.41 28.41 28.42 28.44 28.45 28.46 28.47 28.49 28.51 28.52 28.54 28.56 --- 28.56 28.23 28.57 28.59 28.61 28.63 28.64 28.66 28.68 28.70 28.71 28.73 28.75 28.76 28.78 28.77 28.76 28.75 28.73 28.72 28.75 28.84 28.84 28.87 28.90 28.93 28.93 28.93 28.94 28.94 28.93 28.93 28.94 28.94 28.57 28.94 28.94 28.95 28.95 28.95 28.99 28.99 28.99 28.99 28.99 28.99 28.99 28.99 28.99 28.99 28.99 28.98 28.98 28.98 28.98 28.98 28.98 28.98 28.98 28.98 28. 98 28.98 29.06 29.06 29.07 29.09 29.09 28.94 29.09 29.10 29.11 29.11 29.10 29.10 29.10 29.10 29.10 29.10 29.10 29.10 29.13 29.13 29.13 29.13 29.13 29.13 29.13 29.13 29.13 29.13 29.13 29.13 29.14 28.92 28.92 28.92 28.92 28.92 29.14 28.92 25 27 23 31 r MAY JUN JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1989 1990 442 GROUND-WATER LEVELS RIO HONDO TO RIO PUERTO NUEVO BASINS 182445066043401. Local number, PN-6. LOCATION.--Lat 18°24'45" / long 66°04'34". Owner: U.S. Geological Survey, WRD. Name: Alsacia No. 2. AQUIFER.--Alluvium. WELL CHARACTERISTICS.--Drilled observation well, diameter 4 in (0.10 m) , cased 4 in (0.10 m), 0-27 ft (0-8.23 m), perforated 21-27 ft (6.40-8.23 m) . Depth 27 ft (8.23 m) . DATUM.--Elevation of land-surface datum is about 10 ft (3.05 m) above mean sea level, from topographic map. Measuring point: Hole on well shaft, 3.03 ft (0.91 m) above land-surface datum. REMARKS.--recording observation well. PERIOD OP RECORD.--July 1989 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 3.11 ft (0.95 m) below land-surface datum, Sept. 18, 1989; lowest water level recorded, 7.71 ft (2.35 m) below land-surface datum, Sept. 5, 1990. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 INSTANTANEOUS OBSERVATION AT 1200 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 LOW HIGH OCT 4.71 4.77 4.83 4.91 5.01 5.05 5.12 5.20 5.24 5.31 5.38 5.46 5.54 5.57 5.37 5.11 5.11 5.21 5.30 5.16 5.14 5.18 5.26 5.36 5.44 5.53 5.58 5.59 5.59 4.71 NOV 5.62 5.66 5.72 5.76 5.76 5.69 5.69 5.57 5.53 5.30 5.28 5.29 5.38 5.41 5.46 5.56 5.62 5.62 5.75 5.78 5.70 5.76 5.81 5.85 5.86 5.89 5.96 6.04 6.04 DEC 5.88 5.90 5. 92 5.97 5. 99 5. 99 6.03 6.12 6.23 6.31 6.42 6.50 6.58 6.65 6.73 6.70 6.82 6.84 6. 88 6.95 7.17 7.22 7.25 7.24 7. 10 7. 05 7.09 7.25 5.88 JAN 6.95 6.91 6.94 ,00 7.25 7.17 7.17 7.15 7.11 7.07 7.02 6.94 6.92 6.80 6.54 6.49 6.43 6.39 6.26 6.20 6.25 6.24 6.25 6.26 6.33 6.39 7.25 6.20 FEB 6.42 6.45 6.50 6.56 6. 68 6.77 6.85 6.80 6.79 6.78 6.79 6.83 6.92 6.92 6.98 7.11 7.14 7.10 7.12 7.25 7.26 7.29 7.34 7.34 6.42 MAR 7.30 7.30 7.33 7.34 7.35 7.33 7.31 7.30 7.20 7.17 7.02 6.82 6.57 6.43 6.39 6.30 6.27 6.28 6.30 6.30 6.32 6.36 6.37 6.39 6.42 6.46 6.48 6.50 6.49 6.51 6.44 7.35 6.27 APR 6.47 6.51 6.53 6.58 6.63 6. 67 6.71 6.75 6.79 6.82 6.84 6.85 6.76 6.71 6.68 6.72 6.76 6.76 6.67 6. 64 6.63 6.69 6.74 6.77 6.73 6.69 6.69 6.77 6. 81 6.86 6.86 6.47 MAY 6.86 6.87 6.97 6.97 6.97 6.97 7.05 7.17 6.93 6.56 6.55 6.55 6.62 6.54 6.57 6.65 6.72 6.75 6.84 6.92 7.00 7.08 7.15 7.22 7.30 7.35 7.38 7.44 7.50 7.56 7.59 7.59 6.54 JUN 7. 61 7.53 7.48 7.46 7.26 7.12 7.01 6.95 6.94 6.92 6.85 6.84 6.84 6.86 6.69 6.64 6. 60 6.51 6.48 6.47 6.49 6.52 6.53 6.56 6.49 6.49 6.52 6.57 6.62 6.67 7.61 6.47 JUL 6.65 6.69 6.75 6.79 6.82 6.75 6.75 6.80 6.85 6.88 6.91 6.95 6.99 6.99 7.02 7.03 7.03 6.99 6.94 6.97 7.02 7.04 7.07 6.86 6.74 6.70 6.69 6.36 6.33 6.33 6.35 7.07 6.33 AUG 6.38 6.44 6.45 6.50 6.53 6.53 6.60 6.59 6.65 6.58 6.51 6.54 6.55 6.38 6.35 6.35 6.39 6.36 6.39 6.44 6.49 6.51 6.49 6.58 6.76 6.81 6.92 7.00 7.13 7.24 7.35 7.35 6.35 SEP 7.44 7.50 7.59 7.64 7.67 7.35 7.22 .09 .05 7. 7. 6.99 6.94 6.85 6.85 6.56 6.58 6.62 6.72 6.80 6.82 6.91 7.18 7.18 7.17 7.15 7.15 7.67 6.56 52 ro: £3 Ui I _|Q &'$ UJ < s/V JUN AUG SEP OCT NOV DEC JAN FEB WAR APR MAY JUN JUL A.UG SEP 1989 1990 GROUND-WATER LEVELS RIO HONDO TO RIO PUERTO NUEVO BASINS 443 182437066040501. Local number, PN-7. LOCATION.—Lat 18°24'37", long 66°04'05". Owner: U.S. Geological Survey, WRD. Name: Pargue de las Fuentes No. 2. AQUIFER.--Alluvium. WELL CHARACTERISTICS.--Drilled observation well, diameter 4 in (0.10 m), cased 4 in (0.10 m), 0-34 ft (0-10.4 m), perforated 24-34 ft (7.31-10.4 m). Depth 34 ft (10.4 m). DATUM.--Elevation of land-surface datum is about 16 ft (4.88 m) above mean sea level, from topographic map. Measuring point: Hole on well shaft, 2.97 ft (0.90 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--February 1989 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 6.50 ft (1.98 m) below land-surface datum, Sept. 27, 1989; lowest water level recorded, 9.59 ft (2.92 m) below land-surface datum, Sept. 5, 1990. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 INSTANTANEOUS OBSERVATION AT 1200 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 LOW HIGH JUN JUL AUG SEP 7.21 7.24 7.26 7.29 7.32 7.34 7.33 7.39 7.45 7.51 7.62 7.70 7.82 7. 88 7.87 7.63 7.52 7.52 7.49 7.57 7.60 7.67 7.67 7.67 7.67 7.69 7.79 7.87 8.02 8.04 8.09 8.09 7.21 8.15 8.16 8.24 8.26 8.24 8.12 8.10 8.03 7.78 7.60 7.50 7.47 7.47 7.51 7.60 7.67 7.79 7.83 7.88 7.99 7.98 8.02 8.07 8.11 8.15 8.20 8.25 8.27 --_ 8.32 --- ___ ___ 8.32 8.36 8.38 8.44 8.47 8.50 8.52 8.59 8.63 8.68 8.71 8.75 8.82 8.87 8.93 8.96 8. 96 8.99 9.04 9.10 9.14 9.17 9.20 9.21 9.25 9.32 9.37 9.39 9.27 9.24 9.22 9.39 8.32 9.11 9.09 9.09 9.09 9.12 9.14 9.16 9.19 9.24 9.28 9.28 9.26 9.26 9.27 9.27 9.22 9.17 9.17 9.09 8.90 8.79 8.73 8.72 8.59 8.49 8.46 8.46 8.47 8.48 8.50 8.56 9.28 8.46 8.59 8. 64 8.67 8.68 8.70 8.74 8.79 8.79 8.78 8.70 8.65 8.63 8.66 8.66 8.67 8.70 8.73 8.74 8.74 8.76 8.78 8.78 8.75 8.74 8.75 8.79 8.84 8.85 ___ ___ --- 8.85 8.59 8.86 8.86 8.89 8.91 8.96 8.96 8.97 9.03 9.04 9.03 8.92 8.67 8.45 8.27 8.22 8.19 8.15 8.13 8.17 8.20 8.23 8.26 8.28 8.34 8.39 8.43 8.49 8.50 8.51 8.52 8.52 9.04 8.13 8.52 8.53 8.53 8.55 8.62 8.67 8.74 8.78 8.86 8.89 8.95 8.97 8.97 8.98 8.98 8.98 8.96 8.98 8.89 8.86 8.86 8.87 8.90 8.96 8.97 8.91 8.91 8.96 8.99 9.07 --- 9.07 8.52 9.11 9.11 9.10 9.09 9.08 9.11 9.15 9.16 9.06 8.73 8.64 8.59 8.61 8.53 8.50 8.53 8.58 8.60 8.63 8.70 8.75 8.78 8.83 8.89 8.95 9.02 9.04 9.15 9.23 9.29 9.37 9.37 8.50 9.39 9.40 9.40 9.40 9.37 9.18 9.12 9.06 9.02 9.04 8.99 8.97 8.98 9.00 8.90 8.78 8.77 8.70 8.68 8.69 8.72 8.75 8.79 8.86 8. 84 8.83 8.86 8.89 8.93 8.99 --- 9.40 8.68 9.01 9.06 9.13 9.16 9.20 9.19 9.18 9.17 9.19 9.19 9.21 9.27 9.32 9.33 9.36 9.39 9.41 9.38 9.35 9.37 9.41 9.43 9.45 9.38 9.18 9.15 9.14 8.82 8.73 8.74 8.80 9.45 8.73 8.84 8.88 8.90 8.94 8.97 8.98 9.04 9.06 9.13 9.12 8.98 8.97 8.98 8.89 8.88 8.90 8.93 8.92 8.92 8.94 8.97 8.98 8.99 9. 05 9. 13 9.11 9.11 9.15 9.19 9.28 9.36 9.36 8.84 9.42 9.48 9.55 9.58 9.59 9.32 9.19 8.99 8.97 8.94 8.93 8.92 8.94 8.65 8.61 8.60 8.63 8.67 8.66 8.69 8.74 8.81 8.85 8.87 8.89 8.95 8.99 9.04 9.12 9.17 9.59 8.60 LU Q o:£ LJ < 10 (\a JUN JUL AUG SfP OCT NOV DEC JAN FFB MAR APR MAY JUN JUL AUG SEP 1989 1990 444 GROUND-WATER LEVELS RIO HONDO TO RIO PUERTO NUEVO BASINS 182443066041500. Local number, PN-8a. LOCATION.--Lat 18°24'43", long 66°04'15". Owner: U.S. Geological Survey, WRD. Name: Parque Luis Munoz Harin 1A. AQUIFER.--Alluvium. WELL CHARACTERISTICS.--Drilled observation well, cased 4.0 in (0.10 m), 0-193 ft (0-58.84 m), 4.0 in (0.10 m), perforated pipe 193-203 ft (58.84-61.89 m). Depth 203 ft (61.89 m) . DATUM.--Elevation of land-surface datum is about 13 ft (3.96 m) above mean sea level, from topographic map. Measuring point: Hole on well shaft, 3.25 ft (0.99 m) above land-surface datum. REMARKS.--Observation well. Automatic digital recording installed on September 30, 1989. PERIOD OF RECORD.—September 30, 1989 to December 6, 1989, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, +2.79 ft (+0.85 m) above land-surface datum, Nov. 30, to Dec. 6, 1989; lowest water level recorded, 15.05 ft (4.59 m) below land-surface datum, Oct. 12, 1989. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 INSTANTANEOUS OBSERVATION AT 1200 DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 LOW HIGH OCT 14, 14. 14. 14. 14, 14. 14. 14. 14. 14. 14. 14. 14, 14. 14, 14, 15, 9. ,91 ,88 ,85 ,82 ,79 .76 .73 . 69 ,66 .63 ,60 .57 .54 .51 .48 .45 .00 .91 14 14 14 7 4 2 1 + + 1 + 1 + 2 +2 +2 +2 .42 .50 .41 .11 .11 .34 .31 .46 .55 .22 .75 .22 .16 .27 .79 --- __ _ ___ JAN FEB MAY JUL SEP 9. 10. 11. 12. 12. 13. 13. 13. 14. 14. 14. 14, 15, 14, .91 ,88 , 62 ,51 ,93 ,36 .71 ,84 ,03 ,34 .58 ,85 ,00 ,97 14 14 14 14 14 14 14 14 14 14 14 14 14 14 .42 .39 .35 .32 .29 .26 .23 .20 .17 .14 .11 .08 .13 .15 + 2. + 2. + 2. + 2. + 2. + 2. - - - - _ - - - 79 79 79 79 79 79 -- -- -- -- __ -- -- -- -4 O ull COff 10 LJ <• ^ OCT NOV 1989 DEC + Above land-surface datum GROUND-WATER LEVELS RIO HONDO TO RIO PUERTO NUEVO BASINS 445 182443066041502. Local number, PN-8c. LOCATION.--Lat 18°24'43", long 66°04'15". Owner: U.S. Geological Survey, WRD. Name: Parque Luis Munoz Harin 1C. AQUIFER.--Alluvium. WELL CHARACTERISTICS.--Drilled observation well, diameter 4 in (0.10 m) , cased 4 in (0.10), 0-33 ft (0-10.06 m) , perforated 33-40 ft (10.06-12.2 m) . Depth 40 ft (12.2 m) . DATUM.--Elevation of land-surface datum is about 13 ft (3.96 m) above mean sea level, from topographic map. Measuring point: Hole on well shaft, 3.66 ft (1.12 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.—February 1989 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 10.35 ft (3.15 m) below land-surface datum, Sept. 25, 1989; lowest water level recorded, 14.58 ft (4.44 m) below land-surface datum, Sept. 2,3,4, 1990. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 INSTANTANEOUS OBSERVATION AT 1200 DAY NOV DEC APR MAY JUN SEP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 LOW HIGH 11.16 11.37 11.29 11.61 11.80 11.88 12.12 12.25 12.37 12.52 12.68 12.83 12.96 13.06 12.95 12. 62 12.65 12.73 12.85 12.88 13.01 13.09 12.79 12.85 12.94 13.03 13.11 13.19 13.29 13.35 13.37 13.37 11.16 13.24 13.39 13.49 13.54 13.51 13.38 13.35 13.24 12.99 12.70 12.58 12.55 12.57 12.59 --- 12.81 12.91 12.95 13.00 13.08 13.08 13.19 13.25 13.31 13.36 13.41 13.47 13.50 13.53 13.56 --- ___ ___ 13.61 13.64 13.67 13.70 13.75 13.81 13.89 13.94 13.97 14.01 14. 05 14.11 14.14 14. 19 14.22 14.21 14.26 14.30 14.33 14.35 14.39 14.42 14.45 14.47 14.49 14.51 14.52 14.51 14.17 14.35 14.44 14.52 13.61 14.18 14.30 14.33 14.35 14.40 14.44 14.46 14.47 14.47 14.47 14.45 14.47 14.47 14.47 14.45 14.43 14.41 14.43 14.35 14.11 14.13 14.15 14.17 13.95 13.86 13.86 13 .87 13.89 13.84 13.90 13.93 14.47 13.84 14. 00 14.07 14.10 14.13 14.16 14.19 14.25 14.23 14.24 14.18 14.19 14.20 14.26 14.07 14. 19 14.23 14.27 14.30 14.30 14.34 14.37 14.36 14.35 14.35 14.36 14.37 14.37 14.37 ___ ___ --- 14.37 14. 00 14.35 14.37 14.37 14.37 14.38 14.39 14.40 14.42 14.35 14.38 14.12 13.66 13.24 12.95 12.83 12 .78 12.67 12.73 12.80 12.88 12 .98 13.09 13.17 13.26 13.34 13.40 13 .43 13.52 13.53 13.61 13.61 14.42 12.67 13.65 13.69 13.71 13.77 13.86 13.92 13.96 14.01 14.08 14.11 14.14 14.19 14.12 14.11 14. 14 ___ 14.19 14.19 14.02 13.95 14.04 14.07 14.10 14.15 14. 16 13.95 14.02 14.08 14.12 14.16 --- ___ ___ 14.16 14.20 14.22 14.24 14.27 14.32 14.36 14.39 14.20 13.80 13.91 13.88 13.90 13.80 13.79 13 .79 13.82 13.82 13.86 13.96 ___ 14.07 14.12 14.17 14.22 14.26 14.30 14.35 14.40 14.42 14.43 ___ ___ 14.46 14.41 14.46 14.45 14.35 14.15 14.22 14.23 14.26 14.28 14.22 14.24 14.26 14.28 14.10 14.07 14.10 14. 02 14.00 14.01 14.04 14.05 14.08 14.11 14.10 14.15 14.17 14.19 14.22 14.24 --- 14.46 14.00 14.24 14.30 14.32 14.34 14.36 14.31 14.35 14.36 14.37 14.35 14.40 14.43 14.45 14.45 14.46 14.48 14.45 14.42 14.44 14.48 14.51 14.52 14.53 14.38 14.27 14.32 14.34 14.07 14.04 14.04 14.08 14.53 14.04 14.11 14.13 14.14 14.19 14.24 14.27 14.29 14.31 14.35 14.32 14.28 14.32 14.33 14.20 14.22 14.23 14.25 14.22 14.23 14.25 14.27 14.28 14.23 14.32 14.35 14.34 14.39 14.43 14.46 14.49 14.52 14.52 14. 11 14.55 14.57 14.58 14.58 14.51 14.42 14.36 14.04 14.15 14.15 14.21 14.26 14.28 13.97 14.00 14.02 14.08 14.11 14.11 14.17 14.24 14.26 14.30 14.18 14.21 14.29 14.36 14.35 14.41 14.47 14.58 13.97 Z& 13 17 . \\ -^. / r\,•\j \v, jT ^-~*^-, ^ V-^N.,rx ^^ — ^^/~ r^ MAY JUN JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1989 1990 446 GROUND-WATER LEVELS RIO HONDO TO RIO PUERTO NUEVO BASINS 182417066042700. Local number, PN-10. LOCATION.--Lat 18°24'17", long 66°04'27". Owner: U.S. Geological Survey, WRD. Name: Las Americas No. 1. AQUIFER.--Alluvium. WELL CHARACTERISTICS.--Drilled observation well, cased 4.0 in (0.10 m) , 0-80 ft (0-24.39 m) , 4.0 in (0.10 m), perforated pipe 80-90 ft (24.39-27.43 m) . Depth 90 ft (27.43 m) . DATUM.--Elevation of land-surface datum is about 16 ft (4.89 m) above mean sea level, from topographic map. Measuring point: Hole on well shaft, 3.10 ft (0.95 m) above land-surface datum. REMARKS.--Observation well. Automatic digital recording installed on September 30, 1989. PERIOD OF RECORD.--October 1989 to September 1990. EXTREMES FOR PERIOD OF RECORD. --Highest water level recorded, +0.72 ft (-(-0.22 m) above land-surface datum, June 24, 1990; lowest water level recorded, 2.48 ft (0.76 m) below land-surface datum, Oct. 26-27, 1989. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 INSTANTANEOUS OBSERVATION AT 1200 DAY 1 2 3 4 5 6 7 8 9 10 OCT .52 .59 . 68 .97 1.06 1.12 1.19 1.26 1.31 1.39 .36 .25 ,16 1.11 L.OO .94 .89 .84 .79 DEC .31 .31 .30 .28 .26 .24 .21 .24 .28 .34 JAN L.OO .96 .93 .98 .98 .98 L.03 L.05 L.06 1.09 ,45 ,49 ,39 ,30 ,27 .25 ,23 ,26 ,29 ,32 MAR .74 .68 .88 .85 .78 .70 .62 .52 .46 .38 APR + .82 + .84 + .85 + .81 + .80 + .79 + .77 + .77 + .76 + .73 MAY + .37 + .38 + .37 + .35 + .35 + .37 + .35 + .35 + .39 + .40 .74 .68 .62 .53 .44 .30 .22 .16 .10 . 06 JUL + .54 + .54 + .53 + .50 + .49 + .50 + .49 + .49 + .48 + .48 AUG + . 62 + .62 + .61 + .60 + .58 + .57 + .56 + .55 + .45 + .43 .14 -.08 .01 .09 .14 .16 .16 .17 .14 .05 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 1.47 1.55 1.67 1.71 1.72 1.75 1.78 1.79 1.76 1.75 1.73 2.28 2.37 2. 05 1.83 1.67 1.52 .76 .74 .74 .86 .95 .94 .95 .92 .90 .84 .75 .74 .65 .55 .50 .45 .41 .37 .34 .32 .40 .51 .57 .69 .75 .78 .83 .85 .88 .92 .97 . 99 1.02 1.04 1.04 . 07 .10 .12 .08 .02 .99 .99 .87 .82 .76 .67 .62 .55 .64 .51 .33 .23 .31 .26 .17 .17 .01 .25 .41 .44 .47 .48 .32 .31 .34 .40 .40 1.29 1.74 1.59 1.37 1.20 L.13 L.03 .99 .91 .86 . 82 .79 .77 .31 .21 .04 + .28 + .25 + .34 + .44 + .49 + .54 + .58 + .63 + .66 + .68 + .72 + .74 + .74 + .77 + .79 + .80 + .81 + .83 + .74 + .73 + .75 + .77 + . 80 + .18 + .17 + .17 + .22 + .27 + .29 + .33 + .33 + .34 + .32 + .33 + .36 + .35 + .33 + .33 + .39 + .37 + .34 + .31 + .28 + .23 + .17 + .12 + .08 .03 .13 .19 .23 .24 .25 .32 .49 .54 .63 .71 .75 .00 + .05 + .04 + .07 + .11 + .09 + .22 + .25 + .31 + .29 + .29 + .29 + .32 + .60 + .60 + .58 + .62 + .63 + .62 + .56 + .47 + .44 + .41 + .43 + .41 + .41 + .39 + .42 + .44 + .44 + .41 + .40 + .38 + .43 + .48 + .49 + .50 + .57 + .63 + .64 + .63 + .46 + .46 + .45 + .50 + .54 + .53 + .52 + .52 + .52 + .51 + .51 + .49 + .49 + .48 + .44 + .40 + .33 + .32 + .32 + .28 + .23 + .08 + .24 + .37 + .10 + .06 .00 .04 .11 .15 .18 .22 .29 .35 .37 .33 .25 .17 .08 + .05 + .13 LOW HIGH 2.37 .52 1.36 .32 1.12 .21 1.09 + .48 1.74 + .49 .88 + .83 + . 17 + .85 .75 + .40 .74 + .63 + .38 + .64 + .23 + . 62 .37 + .37 WTR YR 1990 MEAN .19 LOW 2.37 HIGH +.85 -2 " ui I * 4 OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1989 1990 + Above land-surface datum GROUND-WATER LEVELS RIO HONDO TO RIO PUERTO NUEVO BASINS 447 182349066032600. Local number, PN-13. LOCATION.—Lat 18°23'49", long 66°03'26". Owner: U.S. Geological Survey, WRD. Name: Jardin Botanico No. 1. AQUIFER.--Alluvium. WELL CHARACTERISTICS.--Drilled water-table well, diameter 4 in (0.10 m) cased 4.0 in (0.10 m) , 0-45 ft (0-13.72 m), perforated 35-45 ft (10.67-13.72 m) . Depth 45 ft (13.72 m) . DATUM.--Elevation of land-surface datum is about 32 ft (9.75 m) above mean sea level, from topographic map. Measuring point: Hole on well shaft, 2.84 ft (0.86 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--March 1989 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 8.75 ft (2.67 m) below land-surface datum, Sept. 18, 1989; lowest water level recorded, 16.66 ft (5.08 m) below land-surface datum, Aug. 9-10, 1989. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 INSTANTANEOUS OBSERVATION AT 1200 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 LOW HIGH NOV JAN APR JUN 15.30 15.43 15.02 15.32 15.35 15.25 15.37 15.37 15.31 15.40 15.43 15.45 15.45 15.48 15.43 15.19 15.29 15.37 15.42 15.38 15.39 15.43 15.13 15.13 15. 18 15.23 15.26 15.30 15.49 15.48 15.45 15.49 15.02 15.01 15.41 15.47 15.49 15.47 15.48 15.44 15.41 15.30 15.30 15.39 15.49 15.50 15.48 15.48 15.49 15.58 15.47 15.36 15.50 15.49 15.60 15.62 15.64 15.65 15.73 15.76 15.64 15.64 15.65 --- 15.76 15.01 15.72 15.73 15.74 15.76 15.85 15.88 15.93 15.94 15.96 15.97 15.97 15.99 ___ 16.02 16.04 15.81 16.03 16.05 16.04 16.04 16.06 16.07 16.09 16.09 16. 10 16.12 16.13 16.04 15.23 15.97 16.04 ___ 15.68 15.82 15.78 15.80 15.83 15.97 15.99 15.99 15.97 16.02 15.99 16.03 16.04 16.03 16.01 15.83 15.85 16.04 15.96 14.80 15.81 15.84 15.85 15.63 15.79 15.83 15.85 15.85 15.68 15.80 15.83 16.04 14.80 15. 89 15.94 15.93 15.94 15.97 16.01 16.04 15.93 15.50 15.67 15.75 15.79 15.82 15.28 15.80 15.78 15.85 15. 82 15.78 15.92 15.93 15.84 15.93 15.96 15.97 15.97 15.93 15.88 __. __. --- 16.04 15.28 15.81 15.99 16.06 16.07 16.09 16.10 16.11 16.13 15.91 16.12 14.81 15.28 14.48 15.22 15.39 15.39 15.32 15.39 15.41 15.42 15.60 15.66 15.70 15.73 15.74 15.72 15.57 15.73 15.57 15.75 15.74 16.13 14.48 15.81 15.84 15.86 15.89 15.91 15.92 15.93 15.95 15.98 16.00 16.01 16.02 15.95 15.93 15.95 16.05 16.08 16.01 15.79 15.48 15.90 15.92 15.95 15.98 15.97 15.74 15.89 15. 93 15.94 15.95 --- 16.08 15.48 15.95 16.01 16.03 16.06 16.09 16.10 16.10 16.12 15.97 15.75 15.91 15.79 15.76 15.70 15.86 15.92 15.89 15.92 15.91 15.93 15.93 15.94 15.94 15.96 15.98 16.00 16.04 16.05 16.08 16.09 16.11 16.12 15.70 16.13 16.06 16.15 16.08 15.94 15.95 16. 07 16.08 16.13 16.14 16.13 16.15 16.16 16.18 15.93 16.07 16.14 16.13 16.14 16.16 16. 18 16.19 16.20 16.21 16. 15 16.22 16.22 16.25 16.26 16.25 --- 16.26 15.93 16.20 16.29 16.31 16.31 16.29 16.23 16.28 16.25 16.32 16.26 16.36 16.37 16.38 16.37 16.38 16.38 16.35 16.22 16.35 16.40 16.43 16.43 16.44 16.13 16.28 16.36 16.35 16.16 16.17 16.20 16.22 16.44 16.13 16.24 16.24 16.23 16.28 16.32 16.29 16.32 16.33 16.36 16.32 16.29 16.34 16.35 16.28 16.38 16.40 16.42 16.38 16.45 16.44 16.43 16.38 16.29 16.38 16.39 16.36 16.39 16.43 16.44 16.45 16.48 16.48 16.23 16.50 16.50 16.47 16.45 16.29 16.37 16.31 16.02 16.26 16.27 16.35 16.36 16.36 16.16 16.22 16.22 16.22 16.23 16.17 16.21 16.25 16.22 16.30 16.10 16.17 16.22 16.29 16.26 16.33 16.38 --- 16.50 16.02 £ 3 2 6 u^& 10 14 a:3 * 18 £ MAY JUN JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1990 1989 448 GROUND-WATER LEVELS RIO GRANDE DE LOIZA BASIN 182515065594100. Local number, 222. LOCATION.--Lat 18°25'15", long 65°59'41". Owner: U.S. Geological Survey. Name: Campo Rico TW-1. AQUIFER.--Surficial Deposits. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 4 in (0.10 m). Depth 100 ft (30.5 m). DATUM.--Elevation of land-surface datum is about 10.0 ft (3.05 m) above mean sea level, from topographic map. Measuring point: Hole on side of casing, 0.80 ft (0.24 m) above land-surface datum. Prior July 28, 1986, top of shelter floor, 3.10 ft (0.94 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--February 1986 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 4.42 ft (1.35 m) below land-surface datum, Aug. 31, 1986; lowest water level recorded, 7.42 ft (2.26 m) below land-surface datum, Feb. 9, 1986. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 INSTANTANEOUS OBSERVATION AT 1200 DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 LOW HIGH OCT NOV JAN FEE MAR APR MAY JUL AUG SEP __- ___ ___ ___ --- __ _ -_- ___ _-- --- -__ --- ___ --- 6.04 6.02 6.05 6.11 5.93 5.97 5.99 5.93 5.81 5.78 5.80 5.80 5.81 5.80 5.83 5.94 ___ 5 6 6 6 5 5 5 5 5 5 5 5 5 5 6 6 6 6 6 6 6 6 6 5 5 5 5 5 6 5 .97 .05 .08 .01 .96 .84 .77 .68 .77 .77 .79 .87 .98 .99 . 01 .19 .24 .22 .32 .29 .18 .16 .09 .95 .85 .83 .82 .91 ___ ___ --- .32 . 68 5. 6. 6. 6. 6. 6. 6, 6, 5, 5, 5. 5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5 6 5 6 6 6 6 6 5 .93 .10 .15 .11 ,13 .10 .04 .05 .98 .89 ,96 .96 .09 .13 ,11 .17 .22 .22 .20 .06 .04 .98 .94 .89 .90 .09 .99 .08 .05 .12 .10 .22 .89 6. 6. 5. 5. 5. 5. 6. 5. 6. 6. 6. 6. 6. 6. 6. 6. 6. 6. 6. 6. 6. 5. 5. 6. 6. 6. 6. 6. 6. 6. - 6. 5. 11 03 94 90 85 97 03 96 07 12 15 11 05 05 01 05 07 06 03 09 05 97 97 06 03 13 20 18 16 19 -- 20 85 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 .20 .20 .19 .20 .21 .19 .17 .17 .09 .11 .19 .22 .19 .28 .25 .31 .22 .31 .39 .40 .44 .44 .33 .22 .22 .21 .16 .13 .15 .19 .30 .44 .09 6. 6. 6. 6. 6. 6. 6. 6. 6. 6. 6. 6. 6. 6. 6. 6. 6. 6. 6. 6. 6. 6. 6. 6. 6. 6. 6. 6. 6. 6. - 6. 6. 41 45 46 44 42 37 44 41 34 34 23 19 11 17 11 21 30 38 45 47 45 42 22 07 01 04 19 28 35 29 -- 47 01 6.35 6.40 6.41 6.44 6.45 6.34 6.19 6.10 6.09 6.03 6.04 6.04 6.17 6.16 6.20 6.30 6.39 6.41 6.38 6.36 6.20 6.01 5.90 5.79 5.82 5.92 6.02 6.09 6.15 6.25 6.36 6.45 5.79 6.37 6.36 6.33 6.11 5.90 5.93 5.88 5.86 5.87 5.85 5.87 5.96 6.15 6.24 6.38 6.34 6.15 5.99 5.86 5.76 5.71 5.66 5.70 5.79 5.97 6.18 6.21 6.21 6.24 6.29 6.32 6.38 5.66 6.22 6.10 5.85 5.76 5.65 5.51 5.53 5.86 6.09 6.30 6.43 6.48 6.54 6.41 6.40 6.28 6.14 6.03 5.93 5.86 5.80 5.90 5.91 6.08 6.16 6.20 6.34 6.39 6.38 6.34 --- 6.54 5.51 Ld< 0 N D J F M 1987 1988 J J A S 0 N D J F M 1989 AMJJASON D J F M 1990 A M J J A S GROUND-WATER LEVELS 449 RIO HUMACAO TO RIO SECO BASINS 175858066100200. Local number, 6. LOCATION.--Lat 17°58'58", long 66°10'02". Owner: Doctor Bruno. Name: Juana 5. AQUIFER.--Alluvium of Quaternary Age. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 16 in (0.41 m). Depth 173 ft (52.74 m) reported, 110 ft (33.54 m) measured. DATUM.--Elevation of land-surface datum is about 127 ft (38.7 m) above mean sea level, from topographic map. Measuring point: Top of shelter floor, 3.00 ft (0.91 m) above land-surface datum. After Aug. 7, 1981, top of 16 in (0.41 m) casing, 1.55 ft (0.47 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--November 1960 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 26.20 ft (7.99 m) below land-surface datum, Dec. 10, 1979; lowest water level recorded, 65.95 ft (20.10 m) below land-surface datum, June 2, 1968. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 INSTANTANEOUS OBSERVATION AT 1200 DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 LOW HIGH OCT 57.86 57.65 57.45 57.26 57.08 56.89 56.70 56.51 56.32 56.14 55.97 55.75 55.27 54.66 54.07 53.78 53.23 52.60 51.93 51.27 50.57 50.04 49.56 49.05 48.53 47.99 47.47 47.09 46.84 46.78 46.83 57.86 46.78 NOV 46.90 46.93 47.00 47.04 47.12 47.25 47.42 47.60 47.79 47.91 48.03 48.18 48.36 48.51 48.59 48.63 48.62 48.48 48.31 48.15 48.04 47.97 47.88 47.82 47.83 47.89 47.96 47.95 47.92 47.85 48.63 46.90 DEC 47.82 47.79 47.86 48.01 48. 19 48.37 48.45 48.45 48.43 48.51 48.66 48.83 49.00 49.13 49.22 49.31 49.43 49.60 49.79 49.97 50.15 50.32 50.51 50.68 50.87 51.04 51.20 51.36 51.49 51.63 51.77 51.77 47.79 JAN 51.92 52.06 52.22 52.37 52.53 52.68 52.84 53.00 53.16 53.30 53.41 53.49 53.53 53.55 53.56 53.58 53.59 53.56 53.48 53.49 53.56 53.65 53.73 53.81 53.87 53.94 54.00 54.06 54.14 54.24 54.34 54.34 51.92 FEB 54.43 54.50 54.57 54.61 54.65 54.69 54.70 54.74 54.77 54.82 54.87 54.93 54.99 55.06 55.12 55.17 55.22 55.29 55.37 55.49 55.59 55.69 55.80 55.87 55.95 56.04 56.13 56.23 56.23 54.43 MAR 56.29 56.35 56.41 56.49 56.57 56.66 56.75 56.83 56.92 56.98 57.06 57.13 57.21 57.30 57.40 57.50 57.57 56.82 54.78 53.07 52.16 51.57 50.72 50.57 50.10 49.88 49.48 49.32 49.03 49.68 50.28 57.57 49.03 APR 51.95 53.01 53.38 52.10 52.69 53.65 54.29 54.77 55.17 55.48 54.38 53.87 54.65 55.21 55.60 55.87 56.05 56.12 54.93 53.95 54.36 54.61 54.76 54.85 53.34 51.55 51.69 52.66 53.16 53.49 56.12 51.55 MAY 53.73 52.31 51.31 51.38 52.34 52.92 53.31 53.54 52.25 51.15 51.17 52.27 52.92 53.36 53.56 52.07 50.93 50.44 49.57 49.34 49.22 49.68 50.93 50.37 49.33 48.45 48.55 48.60 48.45 48.09 47.84 53.73 47.84 JUN 48.29 48.35 48.40 48.03 47.82 47.92 47.75 47.33 47.84 47.79 47.45 47.39 48.56 49.96 50.90 51.60 52.17 52.64 53.04 53.38 53.65 53.86 54.04 54.21 54.37 54.54 54.69 54.85 55.02 55.19 55.19 47.33 JUL 55.35 55.50 55.65 55.80 55.93 56.10 56.26 56.42 56.57 56.57 56.73 56.90 57.06 57.22 57.37 57.53 57.68 57.83 57.97 58.11 58.21 58.28 58.35 58.39 58.45 58.51 58.56 58.62 58.68 58.75 58.84 58.84 55.35 AUG 58.93 59.02 59.11 59.17 59.25 59.32 59.38 59.50 59.55 59.59 59.63 59.67 59.72 59.77 59.82 59.88 59.93 59.99 60.05 60.09 60.13 60.16 60.18 60.19 60.18 60.17 60.17 60.19 60.21 60.21 60.22 60.22 58.93 SEP 60.24 60.27 60.30 60.35 60.38 60.44 60.48 60.53 60.57 60.60 60.65 60.69 60.66 60.69 60.73 60.77 60.81 60.86 60.91 60.97 61.02 61.08 61.14 61.19 61.25 61.30 61.35 61.40 61.44 61.49 61.49 60.24 WTR YR 1990 MEAN 53.93 LOW 61.49 HIGH 46.78 -JO 32 42 52 62 \ "VI, \ ONDJFMAWJJASONDJFMAMJJASONDJFMAMJJAS 1987 1988 1989 1990 450 GROUND-WATER LEVELS RIO HOMACAO TO RIO SECO BASINS 180415065513900. Local number, 96. LOCATION.--Lat 18°04'15", long 65°51'39". Owner: P.R. Aqueduct and Sewer Authority. Name: OSGS TW-2 or Yabucoa 7. AQUIFER.--Alluvium of Quaternary Age. WELL CHARACTERISTICS.--Drilled observation water-table well, diameter 16 in (0.41 m), cased 0-10 ft (0-3.05 m), diameter 6 in (0.15 m) , cased about 0-183 ft (0-55.79 m), perforated 56-81 ft (17.07-24.70 m), 102-123 ft (31.10-37.50 m), 144-181 ft (43.90-55.18 m). Depth 181 ft (55.18 m). DATUM.--Elevation of land-surface datum is about 25 ft (7.62 m) above mean sea level, from topographic map. Measuring point: Top of shelter floor, 4.00 ft (1.22 m) above land-surface. REMARKS.--Recording observation well. PERIOD OF RECORD.--April 25, 1978 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 13.10 ft (3.99 m) below land-surface datum, Dec. 1987; lowest water level recorded, 28.29 ft (8.62 m) below land-surface datum, Sept. 20, 1980. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 INSTANTANEOUS OBSERVATION AT 1200 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 LOW HIGH 18.62 18.71 18.76 18.89 18.94 18.90 18.89 18. 92 18.97 19.01 19.06 19.06 19. 02 19. 01 19.01 19.00 18.99 19.00 18.97 19.01 19.02 NOV 19.17 19.17 19.14 19.10 19.06 19.00 18.87 18.80 18.84 18.99 19.15 19.27 19.38 19.61 19.81 20.02 20.23 20.45 20.66 20.84 21.01 21.16 21.29 21.38 21.46 DEC 21.90 21.97 22.04 22.12 22.18 22.26 22.31 22.38 22.48 22.56 22.63 22.71 22.75 22. 81 22. 86 22.90 22.92 22.93 22.90 22.79 22.69 22.58 22.46 22.31 22.17 JAN 21.23 21.16 21.10 21.04 20.95 20.88 20.81 20.75 20.70 20.67 20.66 20.69 20.73 20.74 20.76 20.78 20.67 20.62 20.60 20.59 20.61 FEB 20.79 20.67 20.56 20.42 20.32 20.30 20.29 20.29 20.30 20.32 20.36 20.51 20.58 20.66 20.75 20.83 20.91 20.96 20.99 20.99 20.98 20.94 20.85 MAR 20.49 20.47 20.44 20.43 20.44 20.47 20.51 20.59 20.71 20.87 20.95 20.94 20.86 20.75 20.62 20.47 20.33 20.20 20.08 20.00 19.99 20.00 20.03 20.07 20.11 APR 20.51 20.55 20.59 20.67 20.70 20.70 20.69 20.69 20.71 20.73 20.75 20.77 20.78 20.81 20.84 20.87 20.91 20.95 21.00 21.07 21.11 21.14 21.12 21.10 21.08 MAY 20.95 20.92 20.91 20.89 20.87 20.86 20.88 20.89 20.91 20.92 20.92 20.94 20.95 20.94 20.92 20.89 20.84 20.79 20.75 20.72 20.66 20.55 20.43 20.28 20.15 JUN 21.67 21.48 21.08 20.96 21.15 21.14 20.87 20.45 20.36 20.28 20.00 19.92 20.64 21.10 21.12 20.99 21.02 21.03 21.13 21.10 21.13 21.08 20.84 20.64 20.56 JUL 19.86 19.57 19.45 19.74 19.95 20.09 20.07 20.03 20.00 19.99 20.01 20.04 20.08 20.04 19.93 19.78 19.66 19.56 19.47 19.45 19.70 20.30 20.40 20.33 20.22 AUG 21.02 21.02 21.03 20.99 21.04 21.04 20.94 20.78 20.75 20.85 20.81 20.63 20.42 20.29 20.39 20.46 20.25 20.02 19.82 19.67 19.53 19.44 19.46 19.50 19.53 SEP 19.92 19.93 19.94 19.95 19.92 19.92 20.00 20.07 20.11 20.20 20.90 21.23 21.37 21.29 21.22 21.45 21.48 21.41 21.27 21.12 21.00 21.05 21.18 21.31 21.38 19.01 18.99 19.07 19.10 19.12 19.13 21.52 21.58 21.67 21.76 21.84 ___ 22.06 21.91 21.80 21.68 21.53 21.34 20.63 20.68 20.71 20.74 20.77 20.79 20.74 20.63 20.54 ___ ._- ___ 20.17 20.23 20.30 20.37 20.42 20.47 21. 05 21.02 20.98 20. 97 20.96 _._ 20.05 20.00 19.98 20.02 20.62 21.34 20.50 20.51 20.43 20.32 20.16 --- 20.07 19.96 19.87 19.90 20.34 20.87 19.59 19.66 19.72 19.76 19.81 19.91 21.27 21.17 21.06 20.94 20.85 --- 21.84 18.80 22.93 21.34 20.95 19.99 21.14 20.51 21.34 19.98 21.67 19.92 20.87 19.45 21.04 19.44 21.48 19.92 _J •% tiQ 14 -J& 18 ?JQ 22 P 26 < /b $ IK -V.' irv ^ v/\ ky /"' , ^ . rv y° V^ -/ s, v — •\\y /• - r v>v^^^ Ay ^V|/ U ONDJFMAMJJASONDJFMAMJJASONDJFMAMJJAS 1987 1988 1989 1990 GROUND-WATER LEVELS RIO SALINAS TO RIO JACAGUAS BASINS 451 175829066232200. Local number, 87. LOCATION.--Lat 17°58'29", long 66°23'22". Owner: Francisco Alomar. Name: Alomar 1. AQUIFER.--Alluvium of Quaternary Age. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 20 in (0.51 m), iron cased. Depth 112 ft (34.14 m) DATUM.--Elevation of land-surface datum is 35.32 ft (10.77 m) above mean sea level. Measuring point: Bottom of clean-out shelter door, 2.50 ft (0.76 m) above land-surface datum. Prior to August 1981, top of recorder shelter floor, 4.00 ft (1.22 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--April 1967 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 8.45 ft (2.58 m) below land-surface datum, Dec. 10, 1970; lowest water level recorded, 49.18 ft (14.99 m) below land-surface datum, July 27, 1S74. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1989 TO SEPTEMBER 1990 INSTANTANEOUS OBSERVATION AT 1200 DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 LOW HIGH OCT 29.39 29.30 29.56 29.18 29.51 29.24 28.97 28.79 28.92 29.00 29.09 29.04 28.97 29.09 28. 98 28. 67 29.26 28.98 29.05 28. 61 28.91 28.63 28.62 28.97 28.80 NOV 28.65 28.58 28.82 28.45 28.24 28.29 28.42 28.30 28.21 28.59 28.37 28.47 28.48 28.33 28.23 28.38 28.52 28.81 28.51 28.64 29.22 28.96 29.27 29.25 29.38 DEC 29.27 28.96 28.70 28.52 28.83 28.40 28. 07 28.62 28.99 28.75 28.73 29. 17 29.30 28. 89 28.46 28.53 27.86 26.98 27.76 27.85 28.21 28.64 28.71 28.53 28.39 JAN 28.38 28.09 27.84 28.14 28.68 28.72 28.57 28.61 29.20 29.23 29.58 29.63 29.76 29.62 29.60 29.73 30.17 30.30 30.07 30.65 29.38 28.68 28.99 29.18 30.11 FEE 31. 19 30.83 30.83 29.72 29.72 30.69 30.70 30. 61 29.50 28.96 28.49 28.33 28.83 29.33 30.56 31.03 31.34 30.83 30.62 31.35 31.24 31.42 32.05 31.94 31.76 MAR 32.49 32.64 32.50 32.24 32.05 32.49 32.84 32.81 32.97 32.82 32.60 32.66 32 .76 33 .04 33.08 33.33 33.28 32.84 32.54 32.85 32.82 33.46 33.04 33.15 32.85 APR 33.26 33.18 33.52 33.37 33.73 33.58 33.93 33. 60 33.37 33.67 33.15 33.70 33.63 33.58 33.34 32.98 33.60 33.55 33.42 32.64 32.62 33.14 33.24 33.37 33.37 MAY 33.88 33.76 33.93 34.09 33.88 33.27 33.79 34.04 34 .13 34.30 34.00 34.00 33.29 33.66 34.17 34 .19 34 .34 34.45 34.71 34.08 34.14 34 .53 34.6E 34.67 34 .93 JUN 35.45 34.58 34. 61 34.86 35.29 35. 02 35.40 35.41 35.62 35.39 35.33 35.56 35.84 35.67 34.86 34.52 34.28 34.28 34. 48 34.59 34. 86 34.97 35.52 35.25 35. 14 JUL 35.47 35.40 35.66 35.73 35.82 35.53 35.50 35.47 35.37 35.47 35.85 35.75 36.15 35.87 35.46 34.37 34.43 34. tl 34.40 34.27 34.30 34.24 34.26 35.18 35.39 AUG 34.44 34.13 34.27 34.35 34.26 34.42 34.47 34.49 35.16 35.48 35.25 34.81 34.33 34.50 34.59 34.86 34.95 34.96 34.72 34.96 35.28 35.37 35,33 35.38 SEP 35.72 35.90 35.35 35.14 35.02 35.15 35.34 35.85 35.43 34.99 35.19 35.03 35.41 35.52 35.09 34.84 34.86 34.91 35.22 35.24 35.33 35.26 34 .73 34 .47 34 .51 28.99 29.10 29.03 28.54 28.37 28.31 29.20 29.27 29.34 29.32 29.28 ___ 28.47 28. 63 28.45 28. 68 28.86 28.75 30.25 30.51 30.08 29.96 30.39 30.40 30.83 32. 01 32. 18 ___ ___ ___ 32.87 33.40 33.27 33.20 33.98 33.84 33.36 33.41 33.25 33.22 33.41 ___ 34.88 34.85 34.64 34.82 35.06 35.56 35.30 35.32 35.55 35. 51 35.50 ___ 3 5 2 Q 34.75 34 . S5 34 .16 33.96 34.26 35.43 35.19 35.50 35.16 35.27 35.51 34.46 34.47 34.22 33.93 33.76 --- 29.56 28.31 29.38 28.21 29.30 26. 98 30.65 27.84 32.18 28.33 33.98 32.05 33. 93 32.62 35.56 33.27 35.84 34.28 36.15 33,96 35.51 34 .13 35.90 33 .76 WTR YR 1990 MEAN 32.25 LOW 36.15 HIGH 26.98 Id 23 28 33 XR '^ N ***t ^ ~k A*s» N,? sn/ ' ""••» k ' • "\ V^ vl \f\\ ^ I*\ // r*k*^{s&\^1* K ^ ONDJrMAMJJASQNDJrMAMJJASQNDJFMAMJJAS 1987 1988 1989 1990 452 GROUND-WATER LEVELS RIO SALINAS TO RIO JACAGUAS BASINS 180002066132200. Local number, HW-TW-G1. LOCATION.--Lat 18°00'02", long 66°13'22". Owner: U.S. Geclog_cal Survey, WRD, Name: HW-TW-Cl. AQUIFER.--Fractured, volcanic rock, water-cable aquifer WELL CHARACTERISTICS,- Drilled observation well, diaraet&r 7 in (0.13 m), 0-39.5 ft (0-12.0 m), cased 4 in (0.10 m) , 0-38.2 ft U- -.5 JA) , screened 32-37 ft (9.75-11.5 d) . Depth 39.5 ft (12.0 m) . DATUM.--Eliv^ar.ic. .•>£ land-surface datum is 190 ft (58. C m) al:ove n^an sea level. Measuring point: Hole on side of 4 in (C.10 ja) casing, 2.84 ft (0.87 m) above land-surface datum. Prior October 13 , 1988, top if shelter floor, 3.43 ft (1.06 m) above land-surface datum. RcMARKS.--Recording observation well. PERIOD OF RECORD.--April 14, 1938 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water levej recorded, 19.32 ft (6.04 m) below land-surface datum, Apr. 14, 1938; lowest water level recorded, 31.06 ft (9.47 m) below land-surface datum, Sept. …