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Water Resources Data Puerto Rico and the U.S. Virgin Islands Water Year 1989 rtOGICAtstb, /Ike- Cie t* AUG 1 51990 • . ‘A. .:Ak. • St Thomas I Isla cie? St John I Culebra U.S. VIRGIN Isla de Vieques ISLANDS PUERTO RICO Saint Croix I U.S. GEOLOGICAL SURVEY WATER-DATA REPORT PR-89-1 Prepared in cooperation with the Commonwealth of Puerto Rico, the Government of the U.S. Virgin Islands, and other agencies CALENDAR FOR WATER YEAR 1989 1988 OCTOBER NOVEMBER DE CEM BE R SMTWTF S SMTWTF S SMTWT F S 1 1 2 3 4 5 1 2 3 2 3 4 5 6 7 8 6 7 8 9 .10 11 12 4 5 6 7 8 9 10 9 10 11 12 13 14 15 13 14 15 16 17 18 19 11 12 13 14 15 16 17 16 17 18 19 20 21 22 20 21 22 23 24 25 26 18 19 20 21 22 23 24 23 24 25 26 27 28 29 27 28 29 30 25 26 27 28 29 30 31 30 31 1989 JANUARY FE BRUARY MARCH SMTW T F S SMTWT F S SMTWT F S 1 2 3 4 5 6 7 1 2 3 4 1 2 3 4 8 9 10 11 12 13 14 5 6 7 8 9 10 11 5 6 7 8 9 10 11 15 16 17 18 19 20 21 12 13 14 15 16 17 18 12 13 14 15 16 17 18 22 23 24 25 26 27 28 19 20 21 22 23 24 25 19 20 21 22 23 24 25 29 30 31 26 27 28 26 27 28 29 30 31 APRIL MAY JUNE SMTW T F S SMTW T F S SMTWT F S 1 1 2 3 4 5 6 1 2 3 2 3 4 5 6 7 8 7 8 9 10 11 12 13 4 5 6 7 8 9 10 9 10 11 12 13 14 15 14 15 16 17 18 19 20 11 12 13 14 15 16 17 16 17 18 19 20 21 22 21 22 23 24 25 26 27 18 19 20 21 22 23 24 23 24 25 26 27 28 29 28 29 30 31 25 26 27 28 29 30 30 JULY AUGUST SEPTEMBER SMTW T F S S NI T W T F S SMTWT F S 1 1 2 3 4 5 1 2 2 3 4 5 6 7 8 6 7 8 9 10 11 12 3 4 5 6 7 8 9 9 10 11 12 13 14 15 13 14 15 16 17 18 19 10 11 12 13 14 15 16 16 17 18 19 20 21 22 20 21 22 23 24 25 26 17 18 19 20 21 22 23 23 24 25 26 27 28 29 27 28 29 30 31 24 25 26 27 28 29 30 30 31 Water Resources Data WATER RESOURCES DATA PUERTO RICO AND THE U.S. VIRGIN ISLANDS WATER YEAR 1989 ERRATA SHEET Page 9 - First paragraph, third line, makes reference to table 3, should be table 4. Table 4, title explanation, third line, (<0.01) F should be (<0.01). Page 13 - Figure 5, station number 0469 at Rio de la Plata should be 0460 and 0493110 at Rio Piedras should be 049310. Page 200 - Sediment discharge (tons/day) total for September (185314.0) should be 68798.0. Yearly total of sediment discharge (tons/year) 263803.1 should be 147287.1. Page 324 - Discharge 2.85 ft3/s for station 50100600 should be 285 ft3/s. U.S. GEOLOGICAL SURVEY WATER-DATA REPORT PR-89-1 Prepared in cooperation with the Commonwealth of Puerto Rico, the Government of the U.S. Virgin Islands, and other agencies 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 GPO Box 4424 San Juan, Puerto Rico 00936 (Telephone: (809) 749-4346) III 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 Sandra Lagares George Arroyo Ernesto Mangual Ramon Carrasquillo-Perez Julio Oms Angel Class-Cacho Francisco Perez-Blair Iris M. Concepcion Ronald Richards Angel G. Ferrer Miguel Rodriguez Carlos Figueroa Ana V. Sanchez Eduardo Figueroa Jose Rene Sanchez Javier Garcia Luis Santiago-Rivera Allen Gellis Luis Soler Ralph Gonzalez Heriberto Torres-Sierra Evelyn S. Guevara Jose A. Torres Senen Guzman-Rios Michael Torres Karl G. Johnson Ahmed Valencia Ruth I. Guzman typed the text of the report. Francisco Maldonado prepared the illustrations. 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 Allen L. Zack, District Chief, Caribbean District, San Juan, Puerto Rico. 1. REPORT NO. 2. 3. Recipient's Accession No. REPORT DOCUMENTATION PAGE USGS/WRD/HD-901242 _ 4. Title and Subtitle 5 Report Date Water Resources Data for Puerto Rico and the U.S. Virgin Islands February 1990 Water Year 1989 7. Author(s) Russell E. Curtis, Jr., Zaida Aquino, Ricardo J. Vachier, Pedro L. Diaz 9. Performing Organization Name and Address U.S. Geological Survey, Water Resources Division GPO Box 4424 San Juan, Puerto Rico 00936 12. Sponsoring Organization Name and Address U.S. Geological Survey, Water Resources Division GPO Box 4424 San Juan, Puerto Rico 00936 & Performing Organization Rept. No. USGS-WDR-PR-89-1 10. Proorct/Task/Woric Unit No. 11. Contrect(C) or Grant(G) No. (C) (G) 13. Type of Report & Period Covered Annual-Oct. 1, 1988 to Sept. 30, 1989 14. 15. Supplementary Notes . Prepared in cooperation with the Commonwealth of Puerto Rico, the Government of the U.S. Virgin Islands and other agencies. 16. Abstract (Limit: 200 words) Water-resources data for surface-water, quality-of-water, and ground-water records for the 1989 water year for Puerto Rico 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 60 streamflow-gaging stations; 91 partial-record or miscellaneous streamflow stations; stage records for 7 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 76 observatior 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 19. Security Class (This Report) 21. No. of Pages Unclassified 436 NO RESTRICTION ON DISTRIBUTION 20. Security Class (This Page) 22. Price Unclassified See ANSI-239.18) Se* instructions on Reverse OPTIONAL FORM 272 (4-77) (Formerly NT!S-35) Department of Commerce V CONTENTS Page iii Preface 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 Introduction published xiii 1 Cooperation 2 Summary of hydrologic conditions Surface water 3 Precipitation 3 4 Ground water 7 Water quality 9 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 313 Water-quality at partial-record stations in Puerto Rico 325 Ground-water records for Puerto Rico 337 Surface-water records for the U.S. Virgin Islands 389 Ground-Water records for the U.S. Virgin Islands 395 Index 413 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 8 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 continuous surface-water and crest-stage gage 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-recorded stations in Eastern 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 63 14. Map showing the Rio Grande de Arecibo basin 69 15. Map showing the Rio Grande de Manati basin 91 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 139 19. Map showing the Rio Grande de Loiza basin 159 20. Map showing northeastern river basins the Rio Herrera to the Rio Anton Ruiz basins 211 21. Map showing southeastern river basins the Rio Humacao to the Rio Seco basins 231 22. Map showing south coast river basins the Rio Salinas to the Rio Jacaguas basins 247 23. Map showing south coast river basins the Rio InabOn to the Rio Loco basins 259 24. Map showing the Rio Guanajibo basin 279 25. Map showing the Rio Yaguez and the Rio Grande de Atiasco basins 293 26. Map showing the Rio Culebrinas basin 305 TABLES VII Page Table 1. Island-wide monthly precipitation and annual averages for 1989 water year and the 30-year reference period, 1951-80 3 2. Peak discharges during September 18, 1989 and maximums previously recorded at selected streamflow gaging stations in Puerto Rico 6 3. Highest water level recorded during 1989 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 7 4. Surface-water quality stations in Puerto Rico with highest concentration of selected constituents during water year 1989 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 (c,b) 54 Rio Guajataca above Lago Guajataca (d) 56 Canal Principal de Diversiones at Lago Guajataca (c,b) 58 Rio Guajataca above mouth near Quebradillas (d,c,b) 60 RIO CAMUY BASIN Rio Camuy near Bayaney (d) 64 Rio Camuy near Hatillo (d) 66 RIO GRANDE DE ARECIBO BASIN Rio Grande de Arecibo near Adjuntas (c,b) 70 Rio Grande de Arecibo near Utuado (c,b) 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,$) 80 Rio Tanama at Charco Hondo (d) 87 Rio Grande de Arecibo at Central Cambalache (c,b) 89 RIO GRANDE DE MANATI BASIN Rio Orocovis at Orocovis (d) 92 Rio Orocovis near Orocovis (c,b) 94 Rio Grande de Manati near Morovis (d,c,b) 96 Lago El Guineo at Damsite (e) 99 Lago Matrullas at Damsite (e) 100 Rio Bauta near Orocovis (d) 101 Rio Grande de Manati at Ciales (d) 103 Rio Grande de Manati at Highway 149 at Ciales (c,b) 105 Rio Cialitos at Highway 649 at Ciales (c,b) 107 Rio Grande de Manati at Highway 2 near Manati (d,c,b,p) 109 LAGUNA TORTUGUERO BASIN Laguna Tortuguero Outlet near Vega Baja (c,b) 113 RIO CIBUCO BASIN Rio Cibuco below Corozal (d,c,b) 116 Rio Cibuco at Vega Baja (d,c,b) 119 IX SURFACE-WATER AND WATER-QUALITY STATIONS, IN DOWNSTREAM ORDER, FOR WHICH RECORDS ARE PUBLISHED—Continued Page RIO DE LA PLATA BASIN Lago Carite at Damsite (e) 124 Rio de La Plata at Proyecto La Plata (d,c,b) 125 Rio de La Plata near Comerio (c,b) 128 Rio Guadiana near Naranjito (c,b) 131 Lago La Plata at Damsite (e) 133 Rio de La Plata at Highway 2 near Toa Alta (d,c,b,s,p) 134 RIO HONDO BASIN Rio Hondo at Flood Channel near Catafio (c,b) 140 RIO DE BAYAMON BASIN Lago de Cidra at Damsite near Cidra (e) 142 Rio de Bayamon near Aguas Buenas (c,b) 143 Rio de Bayamon near Bayamdon (d) 145 Rio Guaynabo near BayamOn (c,b) 146 Rio de Bayamon at Flood Channel at Bayamon (c,b,p) 148 RIO PUERTO NUEVO BASIN Rio Piedras: Rio Piedras at El Sefiorial (d) 150 Laguna San Jose: Bahia de San Juan: Rio Piedras near Rio Piedras (d,c,b,p) 151 Rio Piedras at Rio Piedras (d) 153 Rio Piedras at Hato Rey (c,b) 154 Quebrada Josefina at Pineiro Avenue (d) 156 Laguna San Jose No. 2 at San Juan (c,b) 157 Bahia de San Juan No. 5 at San Juan (c,b) 158 QUEBRADA BLASINA BASIN Quebrada Blasina near Carolina (c,b) 160 RIO GRANDE DE LOIZA BASIN Rio Grande de Loiza at Quebrada Arenas (d) 162 Quebrada Blanca at El Jagual (d,$) Rio Gurabo: 172 Rio Cayaguas at Cerro Gordo (d,$) 175 Rio Turabo at Borinquen (d,$) 177 Rio Grande de Loiza at Caguas (d,c,b,$) 179 Rio Caguitas at Highway 30 at Caguas (c,b) 187 Rio Bairoa near Caguas (c,b) 189 Rio Valenciano near Juncos (d,$) 191 Quebrada Mamey near Gurabo (d,$) 193 Rio Gurabo at Gurabo (d,$) 195 Rio Gurabo near Gurabo (c,b) 202 Lago Loiza at Damsite (c,b,e) 204 X SURFACE-WATER AND WATER-QUALITY STATIONS, IN DOWNSTREAM ORDER, FOR WHICH RECORDS ARE PUBLISHED--Continued Page Rio Grande de Loiza below Damsite (d) 206 Rio Grande de Loiza below Trujillo Alto (c,b) 207 Rio Canovanas near Campo Rico (d) 209 RIO ESPIRITU SANTO BASIN Quebrada Sonadora near El Verde (d) 212 Quebrada Toronja at El Verde (d) 214 Rio Espiritu Santo near Rio Grande (d,c,b) 216 RIO MAMEYES BASIN Rio Mameyes near Sabana (d) 219 RIO SABANA BASIN Rio Sabana at Sabana (d) 221 RIO FAJARDO BASIN Rio Fajardo near Fajardo (d,c,b,s,p) 223 Rio Fajardo Below Fajardo (c,b) 226 RIO BLANCO BASIN Rio Icacos near Naguabo (d).... ......... ....... 228 RIO HUMACAO BASIN Rio Humacao at Las Piedras (d) 232 Rio Humacao at Highway 3 at Humacao (c,b) 233 RIO GUAYANES BASIN Rio Guayanes at Yabucoa (c,b,p) 235 Rio Guayanes above mouth at Playa de Guayanes (c,b) 237 RIO MAUNABO BASIN Rio Maunabo at Maunabo (c,b) 239 RIO CHICO BASIN Rio Chico at Providencia (c,b) 241 RIO GRANDE DE PATILLAS BASIN Rio Grande de Patillas near Patillas (d,c,b,$) 243 QUEBRADA AGUAS VERDES BASIN Quebrada Aguas Verdes near Salinas (d) 248 RIO SALINAS BASIN Rio Lapas near Rabo del Buey (d) 249 Rio Majada at La Plena (d) 250 RIO COAMO BASIN Rio Coamo near Coamo (c,b) 251 XI SURFACE-WATER AND WATER-QUALITY STATIONS, IN DOWNSTREAM ORDER, FOR WHICH RECORDS ARE PUBLISHED--Continued Page RIO DESCALABRADO BASIN Rio Descalabrado near Los Llanos (d) 253 RIO JACAGUAS BASIN Rio Toa Vaca above Lago Toa Vaca (d) 255 Rio Jacaguas at Juana Diaz (d) 256 Rio Jacaguas below Quebrada Guandbana (d) 258 RIO INABON BASIN Rio Inabon at Real Abajo (d) 260 RIO BUCANA BASIN Rio Bucand: Rio Cerrillos above Lago Cerrillos near Ponce (d) 262 Rio Cerrillos near Ponce (c,b) 263 Rio Bucana at Hwy 14 Bridge near Ponce (d) 265 RIO PORTUGUES BASIN Rio Portugues near Ponce (d,c,b) 267 Rio Portugues at Ponce (c,b,p) 270 RIO GUAYANILLA BASIN Rio Guayanilla near Guayanilla (d) 272 Rio Guayanilla at Central Rufina (c,b,p) 274 RIO LOCO BASIN Rio Loco at Guanica (c,b,p) 276 RIO GUANAJIBO BASIN Rio Guanajibo near San German (c,b) 280 Rio Rosario near Hormigueros (d,c,b,$) 282 Rio Guanajibo near Hormigueros (d,c,b,p) 290 RIO YAGUEZ BASIN Rio Yaguez near Mayaguez (c,b) 294 RIO GRANDE DE ANASCO BASIN Lago Guayo near Castaher (e) 296 Rio Grande de Ahasco near Lares (c,b) 297 Rio Grande de Atiasco near San Sebastian (d,c,b,$) 299 Rio Grande de Ahasco near Ahasco (c,b,p) 302 RIO CULEBRINAS BASIN Rio Culebrinas near San Sebastian (c,b) 306 Rio Culebrinas at Highway 404 near Moca (d) 308 Rio Culebrinas near Aguada (c,b,p) 310 XII SURFACE-WATER AND WATER-QUALITY STATIONS, IN DOWNSTREAM ORDER, FOR WHICH RECORDS ARE PUBLISHED--Continued Page ST. THOMAS, U.S. VIRGIN ISLANDS Bonne Resolution Gut at Bonne Resolution (d) 390 Turpentine Run at Mariendal (d) 391 ST. JOHN, U.S. VIRGIN ISLANDS Guinea Gut at Bethany (d) 392 ST. CROIX, U.S. VIRGIN ISLANDS Jolly Hill Gut at Jolly Hill (d) 393 Discharge at partial-record stations and miscellaneous sites 313 Crest-stage partial-record stations 324 Low-flow partial-record stations 314 Analyses of samples collected of water-quality partial-record stations and miscellaneous sites 326 XIII GROUND-WATER WELLS, BY BASIN, FOR WHICH RECORDS ARE PUBLISHED Page RIO GUAJATACA BASIN Well 182422067015100 Local number 165 338 339 Well 182647066552400 Local number 202 RIO GRANDE DE ARECIBO BASIN Well 182737066370900 Local number 204 340 RIO GRANDE DE MANATI BASIN Well 182544066341500 Local number 205 341 Well 182757066325600 Local number 206 342 Well 182710066303700 Local number 207 343 Well 182308066260400 Local number 210 344 RIO CIBUCO BASIN Well 182647066201700 Local number 70 345 Well 182615066235300 Local number 211 346 Well 182515066194000 Local number 212 347 Well 182330066185700 Local number 213 348 RIO DE LA PLATA BASIN Well 182746066170800 Local number 214 349 Well 182530066135400 Local number 216 350 Well 182655066142400 Local number 217 351 RIO HONDO TO RIO PUERTO NUEVO BASINS Well 182623066111000 Local number 218 352 Well 182441066082600 Local number 219 353 Well 182413066044000 Local number 220 354 Well 182436066031200 Local number 221 355 Well 182511066045401 Local number PN-2 356 Well 182435066052701 Local number PN-5 357 Well 182445066043401 Local number PN-6 358 Well 182437066040501 Local number PN-7 359 Well 182443066041502 Local number PN-8 360 Well 182349066032600 Local number PN-13 361 RIO GRANDE DE LOIZA BASIN Well 182515065594100 Local number 222 362 RIO HUMACAO TO RIO SECO BASINS Well 175858066100200 Local number 6 363 Well 180415065513900 Local number 96 364 RIO SALINAS TO RIO JACAGUAS BASINS Well 175829066232200 Local number 87 365 Well 180002066132200 Local number HW-TW-01 366 Well 180017066132100 Local number HW-TW-02 367 Well 180001066122000 Local number HW-TW-03 368 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.............. 369 Well 180001066122004 Local number HW-TW-03E ............. 370 Well 180000066125200 Local number HW-TW-04.... ..... ....... 371 Well 175947066130601 Local number HW-TW-05B 372 Well 180006066123700 Local number HW-TW-07 373 Well 175939066121400 Local number HW-TW-08 374 Well 175950066125200 Local number HW-TW-10 375 Well 180012066125500 Local number HW-TW-11 376 Well 180012066125502 Local number HW-TW-11C 377 Well 175957066123400 Local number HW-TW-13 378 Well 175946066102000 Local number HW-TW-14 379 Well 175955066103000 Local number HW-TW-15 380 Well 180153066302800 Local number JAC-1 381 Well 180152066302900 Local number JAC-2 382 Well 180124066310200 Local number JAC-3 382 Well 180057066311300 Local number JAC-4 383 RIO INABON TO RIO LOCO BASINS Well 180133066503300 Local number 132 384 RIO GUANAJIBO BASIN Well 180132067033800 Local number 143.......... 385 RIO CULEBRINAS BASIN Well 182018066593200 Local number 83 386 Well 182442067091700 Local number 200 387 ST. CROIX, U.S. VIRGIN ISLANDS Well 174225064471900 Local number 1 396 Well 174225064472000 Local number 2 397 Well 174243064475100 Local number 3 398 Well 174245064475800 Local number 4 399 Well 174308064484400 Local number 6 400 Well 174525064460600 Local number 7 401 Well 174527064460100 Local number 8 401 Well 174532064460300 Local number 9 402 Well 174329064454700 Local number 10 402 ST. THOMAS, U.S. VIRGIN ISLANDS Well 182050064580400 Local number 1 403 Well 182138064543100 Local number 2 403 Well 182138064542500 Local number 3 403 Well 182136064541900 Local number 4 404 Well 182029064535200 Local number 5 404 Well 182038064550300 Local number 6 405 GROUND-WATER WELLS, BY BASIN, FOR WHICH RECORDS ARE PUBLISHED--Continued Page ST. JOHN, U.S. VIRGIN ISLANDS Well 182010064472600 Local number 1 406 Well 182109064460300 Local number 2 406 Well 182116064451000 Local number 3 407 Well 182042064454500 Local number 5 408 Well 182044064454600 Local number 6 409 Well 182044064454800 Local number 7 409 Well 182044064454900 Local number 8 409 Well 182044064455000 Local number 9 410 Well 182044064455200 Local number 10 410 Well 181956064464500 Local number 11 411 XV XVI THIS PAGE WAS LEFT BLANK INTENTIONALLY 1 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1989 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, 1988." This report includes records on both surface and ground water. Specifically, it contains: (1) Discharge records for 60 streamflow-gaging stations, 91 partial-record or miscellaneous streamflow stations, stage records for 7 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, and 1988 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-89-1". 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) 783-4660. 2 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1989 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 Public Works Puerto Rico Highway Authority Puerto Rico Department of Natural Resources Puerto Rico Department of Health Puerto Rico Electric and Power Authority Puerto Rico Rice Corporation Puerto Rico Administration for Agricultural Development Puerto Rico Land Administration Center for Energy and Environment Research, University of Puerto Rico Water Resources Research Institute, University of Puerto Rico Water Resources Research Institute, College of the Virgin Islands Department of Public Works of the U.S. Virgin Islands 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, 1989 SUMMARY OF HYDROLOGIC CONDITIONS Precipitation Precipitation was slightly higher than usual in the 1989 water year. Precipitation averaged about 103 percent of normal, islandwide, varying from 121 percent of normal in the eastern part of the island to 88 percent of normal in the western part of the island. Monthly average precipitation islandwide for water year 1989 and the 30-year (1951-80) normal as reported by the National Oceanic and Atmospheric Administration are listed in table 1. Table 1. Island-wide monthly precipitation and annual averages for 1989 water year and the 30-year reference period, 1951-80. 30-year Water year 1989 normal Month (inches) (inches) Oct. 7.04 7.74 Nov. 5.10 5.95 Dec. 3.26 4.32 Jan. 2.97 3.08 Feb. 4.38 2.35 Mar. 5.21 2.62 Apr. 3.42 4.63 May 4.08 6.48 June 4.29 5.58 July 5.71 5.48 Aug. 7.60 7.28 Sept. 11.68 7.78 TOTAL 64.74 63.29 4 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1989 Surface Water Streamflow in Puerto Rico was slightly above normal during water year 1989. At the end of the year (September 1989), Hurricane Hugo passed near the eastern and northern areas of the island causing a considerable increase in streamflow. A comparison of the 1989 streamflow at four index gaging stations and their long term median and extreme monthly flows is shown in figure 1. In the northern area with streamflow was near the long term median at the beginning of the water year but declined from October 1988 through August 1989. In November,streamflow fell below the long term median. The monthly mean discharge during May for the Rio Grande de Manati index station was the lowest since records began in 1961. During September 1989, as Hurricane Hugo passed the north and east coast, high streamflow was produced. The second highest monthly mean flow for September ever recorded at the Rio Grande de Manati index station occurred in September 1989 as a result of Hurricane Hugo. In the eastern area of the island, streamflow was near the long term median through June but well above the median during the last few months of the water year. The eastern area was the area most affected by Hurricane Hugo. The index station on Rio Fajardo recorded the highest peak discharge since records began in 1962. The monthly mean discharge for September at this station was also the highest ever recorded. The southern and western areas were less affected by Hurricane Hugo. Streamflow in the southern area was below the long term median most of the year, as shown by the index station on Rio Inabcin, although there was above average streamflow from February to April and in September. In the west, streamflow was slightly below the median from October 1988 to February 1989 but was above the long term median during most of the remainder of the water year. During September, Rio Grande de Anasco index station recorded the fourth highest monthly mean discharge ever recorded for this month since records began in 1964. Peak discharges for 11 stations in the areas affected by Hurricane Hugo are listed in table 2. In the U.S. Virgin Islands, precipitation and streamflow patterns generally were similar to those in Puerto Rico. Precipitation was 114 percent of normal, the 30-year (1951-80) average. Streamflow increased dramatically during September when Hurricane Hugo struck the islands causing significant damage. 5 M ONTHLY M EANDISCHARGE. I N CUBI C FEETPER SECO ND WEST NI(ARTP. RIO GRANDE DE ANAS170 NEAR SAN SEBASTIAN RIO GRANDE DE MAP' --kr! .0,T ri WY 2 (5014.40u0) (5',1703eity...1) 4000 4000 1000 1000 100 20 SOUTH RIO INABON AT REAL ABAJO (50112500) 400 1989 MONTHLY MEAN 1965-87 MONTHLY MEDIAN 100 10 44+:•:•:•:*** ••••••••••••••40 :+:4•:••••••14••• *•-•-•-•-•"". .••••••• AbAtAtibl!•%1VofafetitiblVofet M ONTHLY M EAN DISCHARGE. I N CUBICFEET PER SECOND 100 20 EAST RIO FAJARDO NEAR FAJARDO (50071000) > z co oe Cc Z -J z • Ct ›- Z U 0 La 1,1 • CL 4 1,1 • a. 0 z -7 U, • < a 1988 1989 1989 Unshaded area indicates range between highest and lowest month!),mean discharges for the period of record Figure 1.--Monthly mean discharge of selected streams in Puerto Rico. 6 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1989 Table 2. Peak discharges during September 18, 1989 and maximums previously recorded at selected streamflow gaging stations in Puerto Rico. Peak discharge Station September 18 number and (cubic feet name per second) 50035000 Rio Grande de Manati at Ciales 26,500 50039500 Rio Cibuco 6,050 at Vega Baja 50046000 Rio de la Plata at 37,400 Hwy 2 near Toa Alta 50055000 Rio Grande de 27,700 Loiza at Caguas 50057000 Rio Gurabo 54,900 at Gurabo 50059050 Rio Grande de Loiza 63,300 below Damsite 50061800 Rio Canovanas 9,870 near Campo Rico 50063800 Rio Espiritu Santo 17,200 near Rio Grande 50065500 Rio Mameyes 20,500 near Sabana 50067000 Rio Sabana 8,170 at Sabana 50071000 Rio Fajardo 23,500 near Fajardo Maximum discharge of record Discharge (cubic Water feet per second) year 125,000 1971 34,000 1982 95,500 1960 71,500 1960 74,600 1960 124,300 1988 15,000 1982 20,000 1988 19,800 1973 9,010 1983 19,600 1975 Period of record 10-60 to 09-89 01-73 to 09-89 01-60 to 09-89 12-59 to 09-89 10-59 to 09-89 12-86 to 09-89 03-67 to 09-89 08-66 to 09-89 08-67 to 12-73 06-83 to 09-89 10-79 to 09-89 03-61 to 09-89 7 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1989 Ground Water Levels Ground-water levels in most aquifers in Puerto Rico declined from October 1988 to July 1989 in response to slightly below normal rainfall and increased ground-water withdrawals. In August and September 1989, the water levels recovered as tropical storms reaching the island caused above-normal rainfall. New record-high water levels were recorded at several wells in Puerto Rico and the U.S. Virgin Islands during the month of September (table 3). Ground-water levels in the north coast limestone aquifers of Puerto Rico generally declined during October to July, but rose from August to September as a result of above normal rainfall (fig. 2). Ground-water levels in the south coast alluvial aquifers fluctuated in response to pattern of rainfall, streamflow, and ground-water withdrawals. Below normal rainfall and increased withdrawals caused the water levels to decline from October to the end of July. At the Alomar index well, the water level declined 9.30 ft during that period (fig. 2). During August and September this trend was reversed as above normal rainfall occurred in the area. Ground-water levels in the U.S. Virgin Islands (St. Thomas, St. Croix, and St. John) responded to climatological patterns similar to those in Puerto Rico. The water level in observation well 11 at Guinea Gut, on St. John Island rose 18.40 ft during August and September in response to above normal rainfall produced by tropical storms during that period (fig. 2). Table 3. Highest water level recorded during 1989 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 [Explanation: PR - Puerto Rico] Well Local Location 1989 Date Previous Date Period of name number high water high water record level level Saltos 1 165 PR 40.18 09-18-89 44.06 09-30-89 01-82 to 09-89 Levittown 7 218 PR 5.94 09-20-89 6.13 02-22-87 10-85 to 09-89 Ft. Buchannan 1 219 PR 35.58 09-27-89 38.10 06-16-86 10-85 to 09-89 09-28-89 Hyde Park TW-10 221 PR 0.62 09-18-89 1.34 04-16-88 12-85 to 09-89 HW-TW-13 Hw-Tw-13 PR 44.44 09-24-89 44.56 08-25-88 04-88 to 09-89 09-25-89 Fairplains 2 2 St. Croix 20.27 09-30-89 20.82 01-22-88 06-83 to 09-89 Concordia 14 7 St. Croix 10.07 03-04-89 10.76 01-19-88 03-82 to 09-89 Donoe 3 5 St. Thomas 29.15 09-28-89 54.24 11-20-84 03-82 to 09-89 Grade School 3 6 St. Thomas 1.56 09-30-89 3.72 05-22-86 03-82 to 09-89 8 WATER LEVEL, IN FEETBELOW LAND-SURFACE DATUM 20 25 30 WELL 70, SABANA HOYOS 35 OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1988 1989 15 20 WELL 87, ALOMAR 1 25 30 35 1.M =IIMMM116 OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1988 1989 0 10 20 WELL 11, GUINEA GUT ST. JOHN, U.S.V.1. 30 OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1988 1989 Figure 2 .--Ground—water levels at selected wells in Puerto Rico and the U.S. Virgin Islands. 9 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1989 Water Quality In the 1989 water year, the U.S. Geological Survey, in cooperation with local goverment agencies, completed the fifth year of sampling analysis of 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 selected constituents detected during the 1989 water year along with the station at which these concentrations were detected are summarized in table 4. Table 4. Surface-water quality stations in Puerto Rico with highest concentration of selected constituents during water year 1989. [All constituent concentrations are in milligrams per liter; *, Cyanide concentration at all water-quality stations was below the detection limit (<0.01) F; MBAS, Methylene blue active substance] Station Number Station name Constituent Concentration 50086500 Rio Guayanes above mouth at Playa de Guayanes Sulfide 14 50047530 Rio Hondo at Flood Channel near Catafio Boron 2.5 50055000 Rio Grande de Loiza at Caguas Manganese 1.3 50082000 Rio Humacao at Hwy 3 at Humacao Iron 24 50011400 Rio Guajataca above mouth near Quebradillas Zinc 0.14 Cyanide <0.01 50059100 Rio Grande de Loiza below Trujillo Alto Phenols 0.017 50047530 Rio Hondo at Flood Channel near Catafio MBAS 1.9 The presence of high concentrations of fecal coliform (FC) and fecal streptococci (FS) bacteria continued to be the principal surface water quality problem in Puerto Rico during water year 1989 even though the bacteriological analysis showed a decrease in concentrations for this year. During 1989, no station had concentrations exceeding one million colonies per hundred milliliters of raw water. 10 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1989 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 1989 water year that began October 1, 1988 and ended September 30, 1989. 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. 67°15' 67°00' 45' 30' 15' 66°001 45' 65°30' i 1 1 r 1 ATLANTIC OCEAN . c, ,4,6 0 v0 '4, b•vo 0 0 o'k e \ o e " .4 • % 4 • • A • G4 0. 0 • C4'• GI) bo tkb0'9 ,b. to ik. S ik, 0• 0'0 1/0 4 4, 1/40 0 v IS ,0 4.06 1,41 V it.k 0 0 ••00 ‘ • .. \II, 0.. 0, b. q1/4 6 it. 6 0 0 9 441 18°3C • a V' , o i% + 0 410 • ° ) o to ft • de .• _vo Rib Culabrinas ' e9. + . 0 Rib Guayabo Rib Grand• Rio Fajardo Rib Grande 15' de Aliasco Rio Yagiiaz Rib Daguao \ Quabrada Palma Rib Guanajibo Rib Santiago Rib Bianco Rio Anton Ruiz Rfo Humacao Rio Guayanis 18°001 _ o•,4 ,1 1 V _ AS *Iraq i f A* ,4 "0 ,t ,S ,t' tr e 0' 0 0) • , 0 404/1 1/4yr A .. 0 il 04/.40 44 0 BOG . A. .440) 0o ,,,, # e „Gv • iks• (40 A.gitre 4t4A0000 0 e 1/40 V s,ev Cs, or 00 et ,, ,,,, 01 qk 00 .0 ...,-- op ,0 Ao_ko ,0 4,6 to FECAL COLIFORMS iso 0 v 0.*i4 e G el ,?. v ko .• ko Q. t n < 1000 0 10 20 30 KILOMETERS se. fp 1000 - 10,000 i f i 4- 170 •al 10,000 - 100,000 0 110 20 30 MILES III 100,000 - 1,000,000 CARIBBEAN SEA > 1,000,000 III Figure 3.--Location of maximum concentration of fecal coliform bacteria at sampled sites. 67°15' 18°3C Rib Culebrinas Rib Guayabo Rib Grande Rio Grande 15 de Afiasco Rio Yagiiez Rib Guanajibo 18°00'- 1 0 20 1 1 17° 10 67°00' 45' 30' 15' 66°00' 45' 65°30' 7 I I I AT L ANTIC OCE t,e o 00 4-k e ft V Gad` eta tea Ct IP I 0.*0 eta tsoqp ii,, IAS0 atay %ici ko e vo .r- fj:$ +0 ae 4%e + 6 R. b 1, 1 /40 ‘° to q" Rio Fajardo Rib Daguao Quebrada Palma Rio Santiago Rio Blanco \ Rio Anton Ruiz Rib Humacao Rio Guayancis 0 0 i. . Wxe 42,s6o i oci 0 . 0 J 0 42'TP 0 0 e 0 , G to'0 0 ° ipt , qi / \:3 .0 ci} . v .c. 0,k0 (:, tt, 4% p00 I‘, 0 v, y k0 e 0 *. ‘0 o 0 . 'b doje FECAL STREPTOCOCCI ¢ ¢ ,ft.• r v 41e ow ¢ Ck` o - 40 ft.‘ to • < 1000 i1/4 30 KILOMETERS • 1000 - 10,000 • 10,000 - 100,000 • 20 30 MILES 100,000 - 1,000,000 CARIBBEAN SEA > 1,000,000 1 Figure 4.--Location of maximum concentration of fecal streptococci bacteria at sampled sites. 170 67°15' 67°00' 45' 30' 15' 66°00s 45' 65°30' I r 1 A TLANT C OCEAN 7 N,0 0 xo o o 0•0 A0A t 9 A .1/4. 0 eCi .„.3 04 6, . 04 CP w 0 t ot` ei. \ebt c, 0 Is ea '0 so + 0 4,z ,,P 46, 0:" it I ik' 60 10 X 4\,,,, 1 1R°1C . — .... a, 1 0 i i 4 10157 395 \ I SO .00 Rio Culebrinas 27750 A 14) 0 Rib Guayabo 1478 028 b Grande • 8320 Rio Fajardo Rio Grande de Adasco Rio Yaguez 0325 io Daguao Rib Guanallb 032290 Quebrada Palma Rio Santiago 138 Rio Blanco 11'5 \Rib Anton Ruiz Rio Humacao Gua yanis 180 00s 4V Cr' V) .' 00 is t:)° It• 4Ci c0 ‘2* v ) , „+ 04 1/40 ,c'Z' 00t 1) c,0 EXPLANATION 0 fik .0 44 f?•` so • so P 0° so v. * * I .o ce A 1125 SURFACE WATER STATIONS 1 30 KILOMETERS 'o CONTINUOUS STREAMFLOW 20 10 STATION AND NUMBER 10 20 30 MILES A 1006 CREST STAGE GAGE CAR EAN SEA II 1415 LAKE ELEVATION STATION Figure 5.--Location of continuous surface-water and crest-stage gage stations in Puerto Rico. 170 67°15' 67°00' 45' 30' 15' 66°00' 45' 65°30' A TL ANTIC OCEAN ,,% ti esz. 0 q \-v - Ae Ja ir 0 • e 4,o 6e, oe• Ae 4.0 LO 10 t`' 4.40 c;t 9 /o,k'D 0114 290 4 `r 1/40 0+ 0 / ­ 0395 047530 Rib Culebrinas 1491 0110 0381 04982 • sp 18°3C 42.` 1 4 t0 • fis 0469 = 0 Rib Guayabo 107' 0 510 06 Rib Grande 027250 • 010720 832' 04 9 • 05'1 76 027090 0 059 ' 44 ,1, 0725 io Fajardo 04 4 01 5 280 0588 1440 251 1460 31 554 07 0 Rib Grande • • 59 . 4 0 950 0 70 15' de Arlasco 2 .4 7025 0260 0 76 • 440 Rio YagUaz 0307 0552 88 20 • 05.0 Rio ()ague° Rib Guanallbo 1364 : t \ Quebrada Palms \ Rio Santiago 0200 043 • `. Rib Blanco 1 4 0 9 \Rib Anton Ruiz 08 133 Rio Humacao 10 5 Rio Gueyanis 1-4 1 • 0910 129 18°00' 116 lif 91 0 \ \ 6 , i \ r c; 0 0 le 00,2:k. '4,0•„it '00 44106 cs"d 00.4it•t, .ke 46 Co I, 4 0 A. ‘t• 0 0 V \, 0 A ttk- ..N.- _ - tic, 4.0 ig• cu.co N,0 0 0 sto "si`Ao xeq ,0+. EXPLANATION ,.. o '43 CP 1 se' /40 'Cw se 1°1 c;90‘v "*%:, koC) o Q.• V% +Q1/40 ik 1/40 I 0 6,4, 1/40 0 a. 4 i° ko 1,,0 ' - 'le ik ik% ik ' 0 *, QUALITY-OF-WATER STATIONS Ott. koS4 10 20 30 KILOMETERS '0 0430 BIOLOGICAL 1 1 0 10 20 30 MILES 0820 CHEMICAL -V 0710 SEDIMENT (DAILY) CARIBBEAN SEA 70910 SEDIMENT (BI-MONTHLY) Figure 6.--Location of water-quality stations in Puerto Rico. 660 00 65°45' 61 0660 0503 0690 0620 645 62 1;665 /o693. 4A. 064^ 60 061 • 602 05 06 Falardo 0590 Fajardo 720 A • 12- 712 0 26 27 584 0570.1 0728 0554.10 18'15' 53.1 2 tz3 735 07 5 0 29 0770 0535 0527 0775 0776 74 .10 810 05 0777 A 0511.40 0785.10 0530. 787 o Anton Ruiz 0510.10 825 - 82 SURFACE WATER STATIONS A0827 LOW-FLOW PARTIAL-RECORD STATIONS 08 857 08 1 72 085 9421Ax/Cr9 8 915 18° 00 0943 A 0 10 20 KILOMETERS • 945 • 5 10 20 MILES o unabo 0 67°15' 1 67°00' 45' 30' 1 15' 66000' 45' 65030' 18°3C Rib Cuiebrinas Rib Guayabo Rib Grande 00 .165 3 ATLANTIC OCEAN • 00 ,i. 0 ,.. ,o Oki. 00 \01‘ AA KO iSO v alb 1/4 1 kv t",7 t % * e * 00 ‘• ° gi :4 4 e e ee + it' • so 0 0 p.i ost, 6° elf AP. 0ftl:‘ b° • 4 io , o to f o 0 ko • 1/4 l' o. • 0 oi % * Aks QN koe 4 6 ,0 t9fr ti k i" °io6 ise 0 4.41/ AR like * Q% P N-7 ko (r t° '0. iti* og • 04. 01 207 N k0 0 If 217 202 205 * 0 • 218 12 2 6 • • 222. t+ '0 2 1 220 0 10 21 213 • N-2 Rio Fajardo N-6 15' Rib Grande de AiYasco -5 N-1 Rio Yagiisz HW W­ HWTW- Rio Daguao Rib Guanajibo HW TW­ HW- W-04 HW­ HW-TW-13 Quebrada Palma Rio Santiago Rio Bianco Rio Anton Ruiz HW- -01 HW- W-.2 6 Rib Humacao 18°00' 143 0 • 2 J • C 3 HW TW- 5B HW TW 11 H -T -11 Rio Guayanis N-I8 „e 0,. . 0•,i, ,, \ „ „,, ,0 , ,,, . .V „AL. • 40 0 . , 0 ° 0 A 0. 0 4 . o V • 4* q P CP 40 cs. t. o 4 o '0 a '0 a 4 4 Ake 0 Q. 0 svC, 4,* s' A 4.0 ‘. + 1c.0 r e 10 tj‘ 0 * 0 k0 1/4 -0 '0 Cr 1/4 ,. o $ 1/0 4 i• * 0 ko ik b to 0 .c- I . o % .% ° 4 o • to 4 ko 011%0 1/° 0 4 4° kl3 ik 4 k ko 04 A 0,k° 0 1/4 4k 00 se. so 0" ko 10 20 30 KILOMETERS EXPLANATION 17° 10 20 30 MILES • 6 WELL AND WELL NUMBER CARIBBEAN SEA Figure 8.--Location of ground-water stations in Puerto Rico. 0 45 $ 17 65°0 0 18°24" - ST. THOMAS 18c20' 0 1 2 3 4 KILOMETERS I I I i I 'TI O 1 2 3 4 MILES 640 50$ 45' 64040' 18°22' ST. JOHN 7 7 D 4 KILOMETERS 18°1 4 MILES 17°45' Christiansted 4 KILOMETERS 1 1 7°40 3 4 MILES Figure 9.--Location of continuous surface-water stations in the U.S. Virgin Islands. 18 65°05' 65°00' 55' 64°50' ST. THOMAS 18°24' 18(120' 0 1 2 3 4 KILOMETERS Ill I I I 0 1 2 3 4 MILES 18022' 640 501 ST. JOHN 45' 640401 18°1 0 4 KILOMETERS 3 4 MILES Christiansted 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, 1989 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 RESOURCrc DATA FOR PUERTO RICO AND THE U.S. vI.71,;IN ISLANDS, :;a9 66°53' 52' 51' 50' 49' 48' 66°47' 18°02 01 341 ? -4 + , •27 74 • COORDINATES FOR WELLS 21 (18015006644400) AND 74 (181,1150W14 7100t” [51.1 \ COORDINATES FOR WF..t.L! 112 (15.1013306e.502?Ce) 0 I - AND 134 (180120088:03200) 18 ° 00 COORDINATES FOR WELi. (180668066;;027fp:..1 7 0 59' i COORDINATES FOR WELL 16 (176022066495800) I Figure ll.--Grid showing system for numbering wells anr1 miscellaneous sites (latitude and longitude). Records of Stage and Water Disci are 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 o, record. Complere records of lake or reservoir content, similarly, arc jilos, for which stage or content may be computed or estimated with reasonabh accuracy for ary time, or period of time. They .,,ay be obtained using continuous stage-recording device, but need not he. Because dai' mean discharges and end-of-day contents commonly are published for such they are ref, rred to as "daily stations." By contrast, partial records are obtained through (31s_1:.ete measurements without using a continuous stage-recording device and pertin 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 parti1 records." or "Low-flow partial records." Records of miscellaneous :4'ischarg measurements or of measurements from special studies, such as low-flow seepage studies, may be considered as partial records, but the: r-re 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 ra.-.1ge of stages, and notations regarding factors that may affect the relationships between stage and disch:rgc. These da'a. 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, 1989 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 slected 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, 1989 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, 1989 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.--All 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, 1989 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, 1989 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 ft3/s; and to 3 significant figures for more than 1,000 ft3/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, 1989 Classification of Records Water-quality data for surface-water sites are grouped into one of three classifications. A continuing-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, 1989 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, 1989 Sediment Suspended-sediment concentrations are determined from samples collected by using depth-integrating 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, 1989 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 document 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, 1989 Remark Codes The following remark codes may appear with the water-quality data in this report: PRINTED OUTPUT REMARK E Estimated value > Actual value is known to be greater than the value shown < Actual value is known to be less than the value shown K Results based on colony count outside the acceptance range (non-ideal colony count) L Biological organism count less than 0.5 percent (organism may be observed rather than counted) D 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, 1989 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 (lsd). 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, 1989 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, 1989 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, 1989 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 characterized 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, 1989 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. 36 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1989 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, 1989 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 = - E "i log2 "i n n Where "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 different. 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, 1989 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 (CaCO3). Hydrologic 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. Hydrologic 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 (lsd) 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. 39 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1989 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 (A1+3)* 0.11119 Iodide (I-1) 0.00788 Ammonia as NH4+1.. ... .05544 Iron (Fe+3) .05372 Barium (Ba+2) .01456 Lead (Pb+2) .00965 Bicarbonate (HCO3-1). .01639 Lithium (Li+l) .14411 Bromide (Br-1) .01251 Magnesium (Mg+2) .08226 Calcium (Ca+2) .04990 Manganese (Mn+2)*. .03640 Carbonate (CO3-2) .03333 Nickel (Ni+2) .03406 Chloride (C1-1) .02821 Nitrate (NO3-1) .01613 Chromium (Cr+6)* .11539 Nitrite (NO2-1) .02174 Cobalt (Co+2)* .03394 Phosphate (PO4-3). .03159 Copper (Cu+2)* .03148 Potassium (K+1) .02557 Cyanide (CN-1) .03844 Sodium (NA+1) .04350 Fluoride (F-1) .05264 Strontium (Sr+2) .02283 Hydrogen (H+1) .99209 Sulfate (SO4-2) .02082 Hydroxide (OH-1) .05880 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, 1989 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, 1989 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 1010 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, 1989 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 ring C/(m2.time)1 for Deriphyton and macrophytes and fmg C/(m3.time) 1 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 [mg0 / (m2.time)] for Deriphvton and macrophytes and fmg0 /(m3.time)1 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 digestion 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, 1989 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 ft3/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, 1989 Sodium-adsorption-ratio (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, 1989 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 um 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 art of representative water-suspended sediment sample that is retained on a t.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, 1989 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. WATER RESOURCES FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1989 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. 47 48 PUBLICATIONS ON 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 DI. 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-Dl. 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-El. 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. 3-Al. 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. J. 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 and dispersion in streams by dye tracing, by E. F. Hubbard, F. A. Kilpatrick, L. A. Martens, and J. F. Wilson, Jr.: USGS--TWRI Book 3, Chapter A9. 1982. 44 pages. 3-A10. Discharge ratings at gaging stations, by E. J. Kennedy: USGS--TWRI Book 3, Chapter A10. 1984. 59 pages. 3-All. 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-Al2. Fluorometric procedures for dye tracing, by J. F. Wilson, Jr., E. D. Cobb, and F. A. Kilpatrick: USGS--TWRI Book 3, Chapter Al2. 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. 3-81. Aquifer-test design, observation, and data analysis, by R. W. Stallman: USGS--TWRI Book 3, Chapter Bl. 1971. 26 pages. 49 PUBLICATIONS ON TECHNIQUES OF WATER-RESOURCES INVESTIGATIONS--Continued 3-B2. Introduction to ground-water hydraulics, a programed test 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-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-Cl. 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 Porterfield: USGS--TWRI Book 3, Chapter C3. 1972. 66 pages. 4-Al. Some statistical tools in hydrology, by H. C. Riggs: USGS--TWRI Book 4, Chapter Al. 1968. 39 pages. 4-A2. Frequency curves, by H. C. Riggs: USGS--TWRI Book 4, Chapter A2. 1968. 15 pages. 4-B1. Low-flow investigations, by H. C. Riggs: USGS--TWRI Book 4, Chapter Bl. 1972. 18 pages. 4-B2. Storage analyses for water supply, by H. C. Riggs and C. H. Hardison: USGS--TWRI Book 4, Chapter B2. 1973. 20 pages. 4-B3. Regional analyses of streamflow characteristics, by H. C. Riggs: 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-Al. Methods for determination of inorganic substances in water and fluvial sediments, by M. W. Skougstad and others, editors: USGS--TWRI Book 5, Chapter Al. 1979. 626 pages. 5-A2. Determination of minor elements in water by emission spectroscopy, by P. R. Barnett and E. C. Mallory, Jr.: USGS--TWRI Book 5, Chapter A2. 1971. 31 pages. 5-A3. Methods for analysis of organic substances in water, by D. F. Goerlitz and Eugene Brown: USGS--TWRI Book 5, Chapter A3. 1972. 40 pages. 5-A4. Methods for collection and analysis of aquatic biological and microbiological samples, edited by P. E. Greeson, T. A. Ehlke, G. A. Irwin, B. W. Lium, and K. V. Slack: USGS--TWRI Book 5, Chapter A4. 1977. 332 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-Cl. Laboratory theory and methods for sediment analysis, by H. P. Guy: USGS--TWRI Book 5, Chapter Cl. 1969. 58 pages. 6-Al. A modular three-dimensional finite-difference ground-water flow model, by M. G. McDonald and A. W. Harbaugh: USGS--TWRI Book 6, Chapter Al. 1988. 586 pages. 7-Cl. Finite difference model for aquifer simulation in two dimensions with results of numerical experiments, by P. C. Trescott, G. F. Pinder, 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-Al. 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 for Puerto Rico 52 THIS PAGE WAS LEFT BLANK INTENTIONALLY 53 AT ANTIC OCEAN !SABE L A 0114 OUEBRADILL AS de Diversion • 202 AGUADILL A • 165 Drainage boundaries indeterminate in limestone terrane 0110 010790 Logo de Guoiotoco 010720 Limestone Igneous and sedimentary rocks tD 0106 ARES Ftta Colebrinos basin Rio Grande de Masco basin EXPLANATION A 0 106 SURFACE—WATER STATION AND NUMBER V 0105 QUALITY—OF—WATER STATION AND NUMBER F720 QUALITY—OF—WATER PARTIAL RECORD STATION AND NUMBER • 165 WELL AND WELL NUMBER , ' p area Figure 12.--Rio Guajataca basin. I I 54 RIO GUAJATACA BASIN 50010500 RIO GUAJATACA AT LARES, PR WATER-QUALITY RECORDS LOCATION.--Lat 18'18'01", long 66°52'24", at bridge on Highway 111 (km 32.9), 0.1 mi (0.2 km) upstream fro Quebrada Anon, and 0.4 i (0.6 km) northeast of Lares plaza. DRAINAGE AREA.--3.16 mil (8.18 km 2). PERIOD OF RECORD.--Water years 1958-71, 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1988 21... 0840 10.6 217 7.20 20.5 14 8.4 95 16 6000 6800 DEC 13... 0930 1.8 275 7.90 20.0 1.6 7.7 86 <10 K1500 4000 FEB 1989 10... 1030 0.1 292 7.70 20.5 1.5 5.8 66 <10 K640 K1000 APR 11... 1415 0.62 307 8.00 22.0 7.7 8.8 100 16 2400 2800 JUN 06... 1130 2.4 270 7.80 21.0 6.5 8.5 96 22 K1000 800 AUG 21... 1500 3.8 265 7.80 25.0 13 7.4 91 13 K10000 K13000 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SLUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1988 21... 82 5 24 5.4 9.7 0.5 3.3 80 <0.5 11 12 DEC 13... 110 FEB 1989 10... 140 APR 11... 120 0 35 7.3 15 0.6 2.6 120 <0.5 14 12 JUN 06... 97 AUG 21... 110 0 33 6.3 12 0.5 2.6 100 11 10 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) S102) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 21... <0.1 26 138 3.9 24 <0.01 2.10 0.07 0.53 DEC 13... 6 1.49 0.01 1.50 0.03 0.37 FEB 1989 10... 2 <0.01 0.60 0.02 0.38 APR 11... 0.2 30 187 0.31 19 <0.01 0.70 0.03 0.37 JUN 06... 10 1.39 0.01 1.40 0.07 0.43 AUG 21... 0.1 27 166 1.7 11 <0.01 1.50 0.03 0.27 K = non-ideal count RIO GUAJATACA BASIN 50010500 RIO GUAJATACA AT LARES, PR--Continued -WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (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 NO3) AS P) AS AS) AS BA) AS B) AS CO) AS CR) AS CU) NITRO- OCT 1988 21... 0.6 2.7 12 0.06 2 <100 70 <1 2 <10 DEC 13... 0.4 1.9 8.4 0.08 FEB 1989 10... 0.4 1.0 4.4 0.08 APR 11... 0.4 1.1 4.9 0.08 3 100 70 <1 2 <10 JUN 06... 0.5 1.3 3.7 0.06 AUG 21... 0.3 2.1 11 0.06 METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, MANGA- 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- TOTAL STANCE DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1988 <0.1 <1 <1 20 <0.01 1 0.02 21... 1200 5 50 DEC 13... FEB 1989 10... APR <5 <1 10 <0.01 <1 0.03 11... 290 110 <0.1 <1 JUN 06... AUG 21... 55 RIO GUAJATACA BASIN 50010600 RIO GUAJATACA ABOVE LAGO GUAJATACA, PR LOCATION.--Lat 18'19'57*, long 66°55'29', Hydrologic Unit 21010002, 1.0 mi (1.6 km) off road 451, 3 mi (5 km) south of Lago Guajataca, 1.0 mi (1.6 km) east of Eneas and 2.0 mi (3.2 km) west of Piletas. DRAINAGE AREA.--Indeterminate. WATER-DISCHARGE RECORDS PERIOD OF RECORD.--July 1984 to current year. GAGE.--Water-stage recorder. Elevation of gage is 565 ft (172 m), from topographic map. REMARKS.--Records fair, except for estimated daily discharges, which are poor. AVERAGE DISCHARGE.--5 years (1985-89), 33.6 ft'is (0.952 m"/s), 24,340 acre-ft/yr (30.0 hm'/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 2,600 fti/s (73.6 m'/s), May 18, 1985, gage height, 12.03 ft (3.667 m), from rating curve extended above 100 ft'/s (2.83 10/s) on the basis of step-backwater analysis; minimum discharge, 1.9 ft'is (0.054 m'/s), Feb. 11, 17, 1986, Feb. 9, 1988. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,500 ft'/s (42.5 m 3 /s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (W/s) (113/s) (ft) (m) Date Time (W/s) (m'/s) (ft) (m) July 13 1745 *1,340 37.9 *9.64 2.938 No other peak greater than base discharge. Minimum daily discharge, 2.8 ft'is (0.08 m'/s), Feb. 23. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 72 28 8.8 5.7 e3.2 17 119 14 69 16 e18 e22 2 41 25 8.7 5.8 e3.0 15 39 13 48 192 e25 e20 3 29 22 8.3 5.6 3.1 6.1 24 11 22 55 e17 e20 4 24 28 8.0 5.7 3.3 4.6 14 9.9 29 36 e20 e19 5 21 23 12 5.7 3.3 4.3 35 10 21 29 e16 e19 6 20 19 11 5.4 3.5 4.5 72 7.7 14 18 e15 e18 7 25 17 8.3 5.3 3.7 4.4 40 16 12 15 e25 e18 8 64 16 8.4 5.9 3.5 3.8 18 45 10 14 e27 e18 9 95 16 7.8 6.0 3.6 3.8 17 35 9.6 12 e20 e250 10 121 15 7.4 6.6 3.3 3.7 12 19 8.6 10 39 el50 11 64 14 6.7 7.0 3.2 3.5 9.9 13 7.7 25 64 100 12 36 15 7.0 6.2 3.0 35 8.5 11 7.4 48 29 51 13 28 16 7.1 7.8 3.4 14 9.2 15 6.2 179 26 42 14 24 15 6.4 5.7 3.2 6.6 14 14 5.7 124 26 39 15 67 13 6.3 5.6 11 5.3 8.9 9.3 5.4 81 57 e23 16 53 14 6.5 5.4 13 4.5 6.8 7.2 6.6 28 63 e25 17 29 12 5.8 5.9 5.3 4.6 5.7 6.0 18 e25 e35 e17 18 57 12 7.2 5.2 4.2 5.7 5.3 5.5 28 e35 e50 e100 19 102 11 6.8 5.2 3.6 50 4.7 5.6 16 e45 e80 e80 20 222 12 5.8 5.2 4.5 24 4.2 4.9 13 e30 e32 e50 21 108 11 5.7 5.7 3.1 9.0 4.8 4.8 8.7 e23 e25 e45 22 76 14 5.5 4.9 3.5 6.6 3.8 4.3 53 e20 e22 e35 23 52 13 7.1 5.0 2.8 5.7 3.6 4.3 40 e17 e20 e25 24 36 10 7.4 4.6 16 5.0 4.3 3.8 20 e15 e45 e60 25 36 10 10 6.5 10 5.3 3.6 4.4 14 e22 e50 e120 26 164 10 8.6 11 12 4.8 3.3 12 16 e25 e60 e40 27 83 9.7 6.9 6.7 6.6 4.4 3.0 8.5 43 e19 e50 e90 28 49 9.7 6.7 5.5 3.9 4.2 81 4.8 27 e15 e30 e60 29 75 9.1 6.6 4.1 --- 3.9 49 21 44 e14 e50 e35 30 55 9.1 6.4 3.8 5.0 20 45 24 e13 e35 e33 31 37 --- 6.7 e3.2 118 --- 66 --- e13 e25 --- TOTAL 1965 448.6 231.9 177.9 145.8 392.3 643.6 451.0 646.9 1213 1096 1624 MEAN 63.4 15.0 7.48 5.74 5.21 12.7 21.5 14.5 21.6 39.1 35.4 54.1 MAX 222 28 12 11 16 118 119 66 69 192 80 250 MIN 20 9.1 5.5 3.2 2.8 3.5 3.0 3.8 5.4 10 15 17 CAL YR 1988 TOTAL 12086.1 MEAN 33.0 MAX 334 MIN 2.6 WTR YR 1989 TOTAL 9036.0 MEAN 24.8 MAX 250 MIN 2.8 e Estimated RIO GUAJATACA BASIN 50010600 RIO GUAJATACA ABOVE LAGO GUAJATACA, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS AUGUST 1984 TO CURRENT YEAR STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) OCT, 04 1027 24 327 23.5 APR, 05 1026 10.4 410 22.5 DEC, 02 1045 8.3 321 22.0 MAY, 08 1052 14 388 22.0 JAN, 10 1243 6.3 284 22.0 JUN, 05 1055 21 138 23.0 FEB, 01 1048 3.3 344 20.0 AUG, 08 1051 19 145 23.0 MAR, 06 1437 4.0 357 21.5 SEP, 11 1404 68 163 24.0 57 I 58 RIO GUAJATACA BASIN 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 ke) southwest of Segunda Unidad Baldorioty de Castro. and 5.3 1 (8.5 km) south of Quebradillas Plaza. DRAINAGE AREA.--Indeterminate. PERIOD OF RECORD.--Water years 1958-64. 1974 to current year. WATER-QUALITY DATA. WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 DATE OCT 1988 TIME DIS- CHARGE. INST. CUBIC FEET PER SECOND SPE- CIFIC CON- DUCT- ANCE (US/CM) PH (STAND- ARO UNITS) TEMPER- ATURE WATER (DEG C) TUR- BID- ITY (NTU) OXYGEN. DIS- SOLVED (MG/L) OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) COLT- FORM, FECAL. 0.7 UM-MF (COLS./ 100 ML) STREP- TOCOCCI FECAL. KF AGAR (COLS. PER 100 ML) 05... 1540 75 332 7.4 24.0 2.4 .50 6 <10 K8 K13 DEC 13... 1115 70 307 7.6 25.5 0.6 2.0 25 16 K4 K2 FEB 1989 09... 1525 70 310 7.8 25.0 1.5 6.5 79 13 82 83 APR 11... 1605 1 308 7.8 24.5 0.5 4.4 53 19 48 K130 JUN 06... 1300 50 325 7.4 25.0 0.7 4.2 50 61 K100 210 AUG 22... 1030 50 301 7.4 26.5 0.9 2.5 31 16 40 20 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SLUM. SODIUM. AO- SLUM. WAT WH SULFATE RIDE. TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- 01S- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS 5) AS SO4) AS CL) OCT 1988 5... 150 4 55 3.8 5.5 0.2 1.8 140 <0.5 11 8.1 DEC 13... .... 140 FEB 1989 09... 140 APR 11... 140 8 48 4.1 6.7 0.3 2.0 130 <0.5 11 8.6 JUN 6... 130 AUG 22... 150 6 52 3.9 6.2 0.2 1.9 140 11 8.7 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS. TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE. DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN. GEM. GEN, DIS- SOLVED TUENTS, SOLVED DEG. C. NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 5... DEC 13... FEB 1989 09... APR 11... JUN 6... AUG 22... 0.1 7.9 183 37 3 <0.01 <0.10 0.06 0.54 7 0.01 <0.10 0.07 0.33 3 <0.01 <0.10 0.02 0.38 0.1 7.9 166 0.44 2 <0.01 <0.10 0.08 1.0 <1 <0.01 <0.10 0.23 0.17 0.1 6.8 173 23 3 <0.01 <0.10 0.36 0.84 K = non-ideal count RIO GUAJATACA BASIN 59 50011000 CANAL PRINCIPAL DE DIVERSIONES AT LAGO DE GUAJATACA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 DATE NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS 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 NO3) AS P) AS AS) AS BA) AS B) AS CO) AS CR) AS CU) OCT 1988 5... DEC 13... FEB 1989 09... APR 11... JUN 6... AUG 22... 0.6 0.4 0.4 1.1 0.4 1.2 0.03 0.01 0.01 0.02 0.01 0.02 2 1 <100 100 30 20 <1 1 <1 1 10 <10 DATE MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- N1UM, 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 P8) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1988 5... DEC 13... FEB 1989 09... APR 11... JUN 6... AUG 22... 110 160 <5 <5 90 <0.1 60 <0.1 <1 <1 <1 <1 20 <0.01 20 <0.01 1 0.02 <1 0.03 I 60 RIO GUAJATACA BASIN 50011400 RIO GUAJATACA ABOVE MOUTH NEAR QUEBRADILLAS, PR LOCATION.--Lat 18°28'31', long 66'57'46", Hydrologic Unit 21010002, on left bank at ford 1.7 mi (2.7 km) upstream from bridge on Highway 2, 1.6 mi (2.6 km) west of Quebradillas plaza, 2.1 mi (3.4 km) upstream from the Atlantic Ocean, and 6.6 mi (10.6 km) downstream from Lago Guajataca. DRAINAGE AREA.--Indeterminate. WATER-DISCHARGE RECORDS PERIOD OF RECORD.--February to May 1969 (monthly measurements only), July 1969 to December 1970, April 1984 to current year. GAGE.--Water-stage recorder. Elevation of gage is 0.0 ft (0.0 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharge, which are poor. Flow regulated by lago Guajataca 6.6 mi (10.6 km). AVERAGE DISCHARGE.--6 years (1970,1985-89), 91.6 ft'/s (2.594 m)/s), 66,360 acre-ft/yr (81.82 heO/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 6,200 ft'/s (176 m3/s), May 13, 1986, estimated based on a mean daily discharge correlation with station 50011200, 6.5 miles upstream; minimum discharge, 4.7 ft'/s (0.133 mi/s), Aug 10, 1989. EXTREMES FOR CURRENT YEAR.--Maximum discharge, 3,100 ft'/s (87.8 m'/s), Sept. 29, gage-height 7.98 ft (2.432 m); minimum daily discharge, 4.7 ft'/s (0.133 '/s), Aug. 10. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 148 175 e21 11 11 11 35 30 12 7.7 6.1 12 2 168 138 e20 11 9.6 11 28 17 9.6 6.4 6.7 11 3 104 e42 e20 11 9.1 10 23 14 8.8 7.9 6.4 11 4 22 e38 e19 11 8.7 10 18 12 8.9 8.1 e6.0 e12 5 21 36 e18 11 8.5 10 14 12 9.9 8.5 e5.5 e13 6 e21 35 e18 e13 8.1 10 10 11 9.7 10 5.3 e12 7 e20 35 e19 e14 7.5 9.9 9.7 11 8.7 13 6.1 e13 8 26 34 e19 e14 7.7 9.6 18 11 9.1 20 4.9 e13 9 41 34 e18 e14 7.4 10 28 13 9.7 11 4.8 e13 10 178 32 e17 e13 7.2 10 13 12 9.8 10 4.7 e12 11 158 33 e16 15 7.4 10 11 e15 8.9 12 4.8 e335 12 39 41 e15 10 7.5 e28 8.5 e13 8.5 38 5.1 e72 13 26 62 e14 10 7.6 e10 9.6 e14 9.7 144 5.2 12 14 23 75 14 10 7.8 e10 9.8 e13 9.8 18 5.7 12 15 23 e30 14 12 e9.0 e10 10 e13 10 13 5.7 12 16 e22 e28 e14 12 e9.0 9.8 11 12 9.2 9.8 14 11 17 e22 e132 e14 13 e9.8 10 11 e13 8.7 8.6 9.1 e12 18 22 27 e14 12 elO 10 12 e13 172 9.1 e6.9 e13 19 23 24 e14 11 ell 10 13 e13 43 21 e17 e234 20 e22 23 e14 12 ell 11 14 e13 6.8 29 16 47 21 e166 23 e13 13 ell 12 e14 e13 7.0 12 12 21 22 306 22 e14 13 e10 14 e12 e12 6.4 7.3 11 17 23 157 22 e13 13 10 14 e12 e12 6.7 7.6 11 e16 24 137 e23 e13 13 11 13 e12 e12 7.5 7.9 11 e27 25 508 e25 12 13 13 14 e13 11 6.6 8.6 11 203 26 554 e23 12 13 17 16 e13 10 6.6 7.3 28 30 27 621 e22 11 14 18 17 e12 10 6.8 6.7 18 20 28 464 e22 11 e14 13 17 e12 9.1 6.4 6.5 19 52 29 43 e23 ell e12 --- 16 e12 9.4 6.6 6.2 13 375 30 53 e22 e12 9.8 20 18 9.8 7.4 5.9 14 36 31 61 --- e12 e12 17 --- 9.6 --- 5.9 12 --- TOTAL 4199 1301 466 379.8 277.9 390.3 436.6 392.9 450.8 487.0 306.0 1679 MEAN 135 43.4 15.0 12.3 9.92 12.6 14.6 12.7 15.0 15.7 9.87 56.0 MAX 621 175 21 15 18 28 35 30 172 144 28 375 MIN 20 22 11 9.8 7.2 9.6 8.5 9.1 6.4 5.9 4.7 11 CAL YR 1988 TOTAL 25765 MEAN 70.4 MAX 1110 MIN 11 WTR YR 1989 TOTAL 10766.3 MEAN 29.5 MAX 621 MIN 4.7 e Estimated 61 RIO GUAJATACA BASIN 50011400 RIO GUAJATACA ABOVE MOUTH NEAR QUEBRADILLAS, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORD.--Water years 1969 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 DIS- OXYGEN, OXYGEN COLI- STREP­ CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC FEET CON- DUCT- PH (STAND- TEMPER- ATURE TUR- BID- OXYGEN, DIS- (PER- CENT ICAL (HIGH 0.7 UM-MF KF AGAR (COLS. DATE TIME PER SECOND ANCE (US/CM) ARD UNITS) WATER (DEG C) ITY (NTU) SOLVED (MG/L) SATUR- ATION) LEVEL) (MG/L) (COLS./ 100 ML) PER 100 ML) OCT 1988 04... 0930 22 468 7.5 23.0 1.2 6.2 72 <10 110 1100 DEC 13... 1430 15 474 7.7 24.0 1.3 9.4 111 10 49 92 FEB 1989 10... 0830 6.8 546 7.4 23.0 1.0 4.2 48 <10 31 120 APR 12... 0715 8.8 519 7.5 22.0 1.5 4.0 45 <10 330 140 JUN 06... 0830 9.8 520 7.4 23.0 0.3 4.5 51 12 120 180 AUG 22... 0815 11 495 7.5 24.5 1.1 4.3 51 <10 K170 200 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SLUM, SODIUM, AD- SIUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1988 04... 220 18 77 7.8 15 0.5 1.1 190 <0.5 8.6 27 DEC 13... 190 FEB 1989 10... 200 APR 12... 220 18 75 8.2 20 0.6 1.7 130 <0.5 10 34 JUN 06... 200 AUG 22... 230 18 77 8.3 19 0.5 1.3 220 9.0 30 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEM, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 04... 0.1 6.8 276 16 <1 <0.01 1.40 0.03 0.27 DEC 13... <1 1.79 0.01 1.80 0.01 0.39 FEB 1989 10... 2 2.49 0.01 2.50 0.02 0.28 APR 12... 0.1 6.8 278 6.6 2 <0.01 1.70 0.04 0.26 JUN 06... 5 1.99 0.01 2.00 0.04 0.36 AUG 22... 0.1 6.8 276 8.3 4 <0.01 1.90 0.02 0.38 K non-ideal count 62 RIO GUAJATACA BASIN 50011400 RIO GUAJATACA ABOVE MOUTH NEAR QUEBRADILLAS, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (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 NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1988 04... 0.3 1.7 7.5 0.01 <1 100 50 <1 5 <10 DEC 13... 0.4 2.2 9.7 <0.01 FEB 1989 10... 0.3 2.8 12 <0.01 APR 12... 0.3 2.0 8.9 0.02 <1 100 70 <1 3 <10 JUN 06... 0.4 2.4 11 0.02 AUG 22... 0.4 2.1 9.3 0.03 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- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) MANGA- OCT 1988 <5 2 0.04 04... 610 60 0.2 <1 <1 140 <0.01 DEC 13... FEB 1989 10... APR 12... 320 <5 30 <0.1 <1 <1 <10 <0.01 <1 0.04 JUN 06... AUG 22... 63 AT L ANTIC OCEAN HAT ILLO U a CAMUY OLIEBRADILLAS S a ARECIBO 0157 a 0148 Drainage boundaries indeterminate in limestone terrane Boyoney River underground • LARES l ,) Limestone Igneous and sedimentary rocks ,s! R(o Quojataco )41' bosin Ri's? Tononso'l Re Grande de Arecibo biotin UTU400 a Drainage boundary Rio Grande de \ Masco basin ". •. EXPLANATION A 0148 SURFACE-WATER STATION AND NUMBER ,-Mop urea UAN GUADLI •ettrc eo FA440100. AkYAGUE Z CAGUAS. 4 5 KILOMETERS PONCE I I -I ES 3 4 Figure 13.--Rio Camuy basin. I 64 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 i (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 OF RECORD.--May 1984 to current year. GAGE.--Water-stage recorder. Elevation of gage is 341 ft (104 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), 113 ft'is (3.200 m'/s), 81,870 acre-ft/yr (101 hm7yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 6,450 fti/s (183 m'/s), Oct. 7, 1985, gage height, 17.66 ft (5.383 m), from rating curve extended above 300 ft'/s (8.50 m 3/s) on basis of step-backwater analysis; minimum discharge, 25 ft'/s (0.71 m'/s), Apr. 26-28, 1989. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 2,000 ft'is (56.6 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (W/s) (10/s) (ft) (m) Date Time (W/s) (e/s) (ft) (m) Oct. 29 1645 *4,170 118 *15.25 4.648 Sept. 9 2115 2,460 69.7 12.52 3.816 Apr. 1 1600 2,340 66.3 12.23 3.728 Minimum discharge, 25 ft'is ( 0.708 m 3/s), Apr. 26-28. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 158 130 56 41 36 50 590 49 192 57 74 97 2 138 109 55 43 35 51 315 38 224 72 108 94 3 100 99 55 44 34 45 179 35 100 92 70 89 4 94 e92 54 44 34 40 100 32 110 69 88 82 5 90 e88 53 42 34 38 77 29 113 98 68 81 6 90 e82 64 40 34 38 e66 29 74 71 59 80 7 83 e76 60 40 34 38 e78 29 59 69 103 80 8 95 e72 58 40 34 36 54 33 55 93 109 78 9 148 e68 56 40 33 35 49 64 50 67 80 633 10 171 e66 55 39 33 35 44 122 48 55 70 477 11 157 e62 54 39 33 35 42 83 46 68 156 316 12 96 e62 53 39 33 41 39 44 45 e155 142 161 13 87 e80 53 39 33 57 39 44 43 e440 91 132 14 93 51 33 38 e300 97 90 39 44 49 41 109 15 91 75 50 39 35 40 37 39 41 163 250 96 16 98 73 50 39 51 34 34 40 37 117 158 103 17 86 74 50 39 40 37 32 31 49 101 141 91 18 81 70 50 38 37 37 31 30 79 173 228 426 19 144 67 49 38 34 76 31 29 82 188 303 392 20 342 67 44 38 33 97 31 31 124 el20 132 198 21 281 66 44 38 32 49 32 35 69 91 104 188 22 244 64 44 36 32 42 30 29 59 80 93 133 23 251 72 44 e35 32 28 108 68 88 39 28 118 24 131 68 e34 44 48 38 28 27 93 65 178 297 25 109 63 45 e33 186 37 27 27 74 91 192 498 26 134 73 44 e35 177 35 26 27 54 103 229 171 27 144 64 42 40 166 35 25 28 50 74 226 369 28 102 59 41 41 77 34 28 28 69 64 128 229 29 574 58 41 38 --- 60 103 60 194 34 28 148 30 469 57 41 36 34 90 89 103 58 133 138 31 247 --- 40 36 66 --- 118 --- 56 103 --- TOTAL 5128 2246 1540 1202 1453 1350 2280 1338 2397 3378 4195 6104 MEAN 165 74.9 49.7 38.8 51.9 43.5 76.0 43.2 79.9 109 135 203 MAX 574 130 64 44 186 97 590 122 224 440 303 633 MIN 81 57 40 33 32 34 25 27 40 55 59 78 CAL YR 1988 TOTAL 37490 MEAN 102 MAX 845 MIN 31 WTR YR 1989 TOTAL 32611 MEAN 89.3 MAX 633 MIN 25 e Estimated 65 RIO CAMUY BASIN 50014800 RIO CAMUY NEAR BAYANEY, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS JUNE 1984 TO CURRENT YEAR STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA­ DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS OUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) OCT, 05 1151 90 277 24.5 APR, 07 1111 80 338 23.5 DEC, 15 1458 52 318 23.0 MAY, 10 1309 78 291 23.5 JAN, 12 1142 40 315 23.0 JUN, 07 1413 60 189 24.0 FEB, 03 1201 34 340 22.5 AUG, 10 1120 69 190 24.0 MAR, 08 1212 36 337 22.5 SEP, 14 1236 107 154 26.0 I I 66 RIO CAMUY 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 i (2.9 Km) southeast of Camuy plaza, 1.2 mi (1.9 ka) 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 a), from topographic map. REMARKS.--Records fair. Gage-height and precipitation satellite telemetry at station. AVERAGE DISCHARGE.--5 years (1985-89), 185 ft'/s (5.239 m'/s), 134,000 acre-ft/yr (165 he/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 10,500 ft,/s (297 '/s), Oct. 7, 1985, gage height, 24.75 ft (7.544 m), from rating curve extended above 200 ft,/s (5.66 a 3 /s) on basis of step-backwater analysis; minimum discharge, 34 ft'/s (0.963 m'/s), Feb. 7-8, 10-13. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 2,500 ft'/s (70.8 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (10/s) (ft) (a) Date Time (ft'/s) (m0/s) (ft) (m) Oct. 1 2015 2,540 71.9 14.85 4.526 Sept. 9 2400 4,150 118 17.82 5.432 Oct. 29 2245 *6,600 187 *21.06 6.419 Sept. 25 0530 4,580 130 18.50 5.639 Apr. 1 2030 3,590 102 16.88 5.145 Minimum discharge, 34 ft'/s (0.963 m'/s), all or part of each day, Feb. 3-8, 10-13. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 430 342 73 53 36 63 937 67 293 87 76 130 2 385 260 71 53 35 61 682 49 328 84 121 122 3 163 174 70 52 35 54 304 45 135 121 82 115 4 133 144 69 52 34 48 138 42 135 88 94 106 5 122 134 69 51 34 47 97 41 170 122 81 105 6 118 125 78 50 34 48 86 40 108 97 71 103 7 108 118 70 50 34 47 147 40 91 84 80 100 8 125 111 70 49 34 45 85 40 86 129 158 101 9 260 108 68 50 35 44 73 74 81 95 91 653 10 249 104 67 50 35 43 65 169 76 79 77 1070 11 306 100 66 53 35 42 61 135 73 80 141 648 12 148 99 65 52 35 47 58 61 72 359 181 216 13 127 106 65 49 35 66 56 57 70 718 110 193 14 121 140 63 49 35 49 55 67 68 608 90 141 15 139 100 63 47 38 45 52 53 67 179 298 124 16 146 97 62 46 55 44 49 48 66 116 240 128 17 120 102 61 46 42 46 47 44 71 98 177 111 18 106 95 62 45 41 43 46 42 99 212 207 721 19 135 88 60 44 38 68 45 41 102 255 621 1040 20 361 86 59 44 37 154 44 40 159 171 186 326 21 530 84 59 44 36 64 46 58 95 112 129 311 22 318 83 60 42 37 53 43 44 76 99 113 228 23 507 87 58 41 36 48 41 40 129 86 106 182 24 194 86 57 40 52 45 40 38 111 82 211 384 25 149 80 61 39 244 43 40 37 115 88 276 2110 26 140 87 57 43 298 42 39 42 81 132 345 370 27 287 82 56 45 364 41 39 43 74 90 399 520 28 142 77 55 41 100 40 38 38 90 77 214 506 29 1050 75 54 38 --- 40 67 42 112 74 276 235 30 1950 73 54 37 43 100 107 152 71 203 193 31 914 --- 54 36 54 --- 162 --- 69 134 --- TOTAL 9983 3447 1956 1431 1904 1617 3620 1846 3385 4762 5588 11292 MEAN 322 115 63.1 46.2 68.0 52.2 121 59.5 113 154 180 376 MAX 1950 342 78 53 364 154 937 169 328 718 621 2110 MIN 106 73 54 36 34 40 38 37 66 69 71 100 CAL YR 1988 TOTAL 62088 MEAN 170 MAX 3560 MIN 38 WTR YR 1989 TOTAL 50831 MEAN 139 MAX 2110 MIN 34 RIO CAMUY BASIN 50015700 RIO CAMUY NEAR HATILLO, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS AUGUST 1984 TO CURRENT YEAR STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TINE INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) OCT, 05 0835 122 328 24,0 APR, 07 0154 153 343 22.5 DEC, 15 1148 69 353 23.0 MAY, 10 0953 90 318 23.0 JAN, 12 0837 52 338 22.0 JUN, 08 0920 91 186 24.0 FEB, 03 0845 34 340 22,5 AUG, 10 0837 76 180 23.0 MAR, 08 0851 46 372 22.0 SEP, 14 0918 137 168 26.0 67 68 THIS PAGE WAS LEFT BLANK INTENTIONALLY 69 ,,,,N ATLANTIC OCEAN l!HATILLO .„0 AREC1B 0204 • BARCELONE TA Bayoney aFlorida Drainage boundaries indeterminate 'n limestone terrane ,0 Rra L. imestone 72(3 lgreous and sedimentary rocks0280 Rib Corny), basin c) .0 UTUADO 02605 JAYUYA RiO Grande de c Masco basin ADJUNTAS • Drainage boundary Rio Inabon Drainage boundarYNE,'020050.4 Rio Bucandbasin basin EXPLANATION Rio Portoque's basin Island divide••1 '^ilk A 0284 SURFACE-WATER STATION AND NUMBLR V 0205 QUALITY-OF-WATER STATION AND NUMBER Rio Guayonilio (Rio Tanana° basin basin • 7 025110 QUALITY-OF-WATER PARTIAL RECORD STATION AND NUMBER 7---Map area • 135 WELL AND WELL NUMBER 1,4jARDO ILOMETERS A ASVC U. 4- ES GUAYAMA de Mandl( basin Figure 14.--Rio Grande de Arecibo basin. I I RIO GRANDE DE ARECIBO BASIN 50020500 RIO GRANDE DE ARECIBO NEAR ADJUNTAS. PR WATER-QUALITY RECORDS LOCATION.--Lat 18°10'54", long 66°44'12', at Highway 135 bridge, 1.0 i (1.6 km) upstream from Lago Adjuntas, and 1.5 mi (2.4 km) northwest of Adjuntas plaza. DRAINAGE AREA.--12.7 i' (32.9 km') this does not include 6.0 mil (15.6 km') above Lago Garzas. PERIOD OF RECORD.--Water years 1969-74. 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND. FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1988 18... 0900 28 283 7.7 20.0 2.5 8.0 92 <10 4300 290 DEC 21... 1225 30 302 8.3 23.0 1.2 8.8 106 11 2300 9000 FEB 1989 22... 1200 8.6 324 8.5 23.5 1.4 9.8 119 <10 200 340 APR 18... 1300 12 357 8.6 24.0 2.2 9.0 111 81 K1800 44000 JUN 21... 1145 9.8 302 7.8 21.0 1.2 8.4 98 11 K18000 410 AUG 28... 1330 30 268 7.7 24.5 1.7 8.4 104 13 4500 K19000 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SIUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1988 18... 110 7 26 10 15 0.7 1.9 99 <0.5 9.7 19 DEC 21... 110 FEB 1989 22... 110 APR 18... 120 4 31 11 79 3 3.2 110 <0.5 10 120 JUN 21... 94 AUG 28... 96 25 8.1 16 0.7 2.0 90 10 18 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS. TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C. NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L D1S- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 18... 0.1 28 169 13 <1 1.17 0.03 1.20 0.11 0.39 DEC 21... 8 1.04 0.06 1.10 0.02 0.28 FEB 1989 22... <1 0.83 0.07 0.90 0.04 0.36 APR 18... 0.1 26 352 12 <1 0.68 0.12 0.80 0.07 0.83 JUN 21... <1 0.96 0.04 1.00 0.10 0.30 AUG 28... 0.1 28 162 13 12 0.95 0.05 1.00 0.15 0.35 K = non-ideal count 70 RIO GRANDE DE ARECIBO BASIN 50020500 RIO GRANDE DE ARECIBO NR AOJUNTAS, PR--Continued WATER QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA * NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (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 NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1988 18... 0.5 1.7 7.5 0.09 <1 <100 20 <1 <1 <10 DEC 21... 0.3 1.4 6.2 0.14 FEB 1989 22... 0.4 1.3 5.8 0.17 APR 18... 0.9 1.7 7.5 0.26 <1 100 20 <1 1 10 JUN 21... 0.4 1.4 8.2 0,10 -- ea AUG 28... 0.5 1.6 7.1 0.10 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- DATE (UG/L (UG/L (UG/L (UG/L (UG/L MANGA- (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1988 18... 150 <5 50 <0.1 <1 <1 <10 <0.01 <1 0.03 DEC 21... FEB 1989 22... APR 18... 260 <5 190 <0,1 <1 <1 <10 <0.01 <1 0.09 JUN 21... AUG 28... 71 I I RIO GRANDE OE ARECIBO BASIN 50025000 RIO GRANDE DE ARECIBO 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 fro Rio de Caguana, and 2.5 i (4.0 km) north of Utuado plaza. DRAINAGE AREA.--66.0 mi 2 (110.9 km') this excludes 6.0 mi' (15.5 km') upstream from Lago Garzas to Rio Guayanes in the Rio Tallaboa basin. PERIOD OF RECORD.--Water years 1959-74, 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 DATE OCT 1988 TIME DIS- CHARGE, INST. CUBIC FEET PER SECOND SPE- CIFIC CON- DUCT- ANCE (US/CM) PH (STAND- ARD UNITS) TEMPER- ATURE WATER (DEG C) TUR- BID- ITY (NTU) OXYGEN, DIS- SOLVED (MG/L) OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) COLI- FORM, FECAL. 0.7 UM-MF (COLS./ 100 ML) STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) 18... 1200 73 287 8.0 25.0 8.0 8.0 96 <10 27000 680 DEC 23... 0850 63 278 8.0 21.5 1.6 8.3 93 <10 5800 K1300 FEB 1989 28... 0915 8.6 273 8.0 22.5 2.2 8.3 95 <10 5600 K1500 APR 20... 1110 29 296 8.4 24.0 0.5 8.6 101 22 K2700 K320 JUN 20... 1230 70 274 7.9 26.0 17 7,4 91 15 K3000 530 AUG 25... 1145 88 235 7.8 28.0 31 7.3 93 10 54000 2400 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SIUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- 015- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLU SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1988 18... 100 12 26 8.7 15 0.7 2.3 89 <0.5 22 15 DEC 23... 94 FEB 1989 28... 93 APR 20... 110 9 29 8.9 16 0.7 2.2 100 <0.5 20 15 JUN 20... 79 AUG 25 88 24 6.9 12 0.6 2.7 79 13 13 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2*NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 18... 0.1 28 170 34 <1 1.14 0.06 1.20 0.10 0.5 DEC 23... 6 1.07 0.03 1.10 0.03 0.37 FEB 1989 28... <1 0.97 0.03 1.00 0.05 APR 20... 0.1 24 175 14 1 0.60 0.10 0.70 0.09 0.21 JUN 20... 21 0.94 0.06 1.00 0.22 2.1 AUG 25... 0.1 23 142 34 38 0.88 0.02 0.90 0.15 0.45 K non-ideal count 72 RIO GRANDE DE ARECIBO BASIN 50025000 RIO GRANDE DE ARECIBO NEAR UTUADO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEM, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (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 NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1988 18... 0.6 1.8 8.0 0.13 <1 <100 10 <1 <1 <10 DEC 23... 0.4 1.5 6.6 0.10 FEB 1989 28... <0.2 0.12 -- APR 20... 0.3 1.0 4.4 0.16 <1 100 30 <1 <1 <10 JUN 20... 2.3 3.3 15 0.14 AUG 25... 0.6 2.3 7.5 0.10 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- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1988 18... 580 <5 40 <0.1 <1 <1 <10 <0.01 1 0.02 DEC 23... -- FEB 1989 28... APR 20... 150 <5 20 0.1 <1 <1 <10 <0.01 9 0.09 JUN 20... AUG 25... 73 I I I 74 RIO GRANDE DE ARECIBO 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 a) off Highway 531. 700 ft (213 ) upstream fro• Lago Caonillas, 3.3 i (5.3 km) northwest of Jayuya plaza. DRAINAGE AREA.--40.4 12 (104.6 km2 ). PERIOD OF RECORD.--Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1988 19... 0910 43 189 8.0 21.0 6.9 8.3 95 22 2300 K140 DEC 21... 0920 26 200 8.2 22.5 0.9 8.5 100 14 200 73 FEB 1989 22... 0935 20 220 8.1 23.5 0.6 8.6 103 <10 K100 70 APR 18... 1010 20 205 8.3 21.0 0.4 10.2 117 <10 27 K99 JUN 21... 0915 21 196 8.0 22.0 0.6 9.2 106 12 K730 K110 AUG 28... 1115 30 201 7.9 26.0 4.1 8.4 106 10 K170 64 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SLUM, SODIUM, AD- SIUM, WAT WH SULFATE RIDE. TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (NG/L TOT FLO SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS 504) AS CL) OCT 1988 19... 78 8 21 6.3 9.1 0.5 2.2 67 <0.5 14 9.3 DEC 21... 77 FEB 1989 22... 77 APR 18... 79 3 21 6.5 12 0.6 1.4 75 <0.5 13 10 JUN 21... 78 AUG 28... 75 20 6.1 11 0.6 1.7 70 13 8.8 SOLIDS. RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO20403 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 19... 0.1 22 127 15 7 <0.01 0.50 0.03 0.47 DEC 21... 14 <0.01 0.40 "0.01 FEB 1989 22... <1 0.40 <0.01 <0.01 APR 18... 0.1 20 130 7.1 15 <0.01 0.20 0.01 0.19 JUN 21... <1 <0.01 0.20 0.02 0.18 AUG 28... 0.1 127 3 <0.01 0.20 23 10 0.02 0.38 K non-ideal count RIO GRANDE DE ARECIBO BASIN 50026050 RIO CAONILLAS ABOVE LAGO CAONILLAS NEAR JAYUYA, PR—Continued WATER-QUALITY DATA. WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA 4, NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (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 NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1988 19... <0.2 0.04 <1 100 20 <1 1 10 DEC 21... 0.2 0.6 2.7 0.01 FEB 1989 22... 0.3 0.7 3.1 0.07 APR 18... 0.2 0.4 1.8 0.07 <1 100 20 <1 1 10 JUN 21... <0.2 0.05 AUG 28... 0.4 0.10 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- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1988 19... 340 <5 190 <0.1 <1 1 <10 <0.01 4 0.01 DEC 21... FEB 1989 22... APR 18... 80 <5 <10 <0.1 <1 <1 10 <0.01 <1 0.02 JUN 21... AUG 28... 75 I 76 RIO GRANDE DE ARECIBO BASIN 50027250 RIO GRANDE OE 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 •it (436 km') does not include 6.0 i 2 (15.6 km') above Lago Garzas. PERIOD OF RECORD.--Water years 1970-71, 1974 to current year. DIS- OXYGEN, OXYGEN COLI- STREP­ CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1988 19... 1230 E850 202 7.3 24.5 10 4.9 58 20 54 30 OEC 23... 1035 37 217 7.6 24.5 4.2 7.0 83 23 K10 30 FEB 1989 28... 1240 166 209 7.4 24.0 32 5.2 61 <10 K1200 3000 APR 20... 0915 36 218 7.7 23.0 0.7 6.7 78 44 K10 K160 JUN 20... 0930 36 214 7.4 24.0 2.6 6.6 78 14 K700 40 AUG 25... 0845 21 211 7.4 26.0 25 6.3 77 10 K1500 K300 HARD- ALKA- FARO- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCAR8 CALCIUM SLUM, SODIUM, AD- SIUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- 01S- 01S- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLU SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS 504) AS CL) OCT 1988 19... 73 5 19 6.2 11 0.6 1.7 70 <0.5 14 9.2 DEC 23... 78 FEB 1989 28... 69 APR 20... 82 5 22 6.5 11 0.5 2.2 77 <0.5 15 11 JUN 20... 76 AUG 25... 83 23 6.1 9.9 0.5 2.5 72 13 10 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEM, GEN, GEM, GEN, GEM, 01S- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2.NO3 AMMONIA ORGANIC SOLVED (MG/L 01S- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 19... <0.1 24 126 10 0.68 0.02 0.70 0.08 0.32 DEC 23... 10 0.69 0.01 0.70 0.02 0.28 FEB 1989 28... 24 0.58 0.02 0.60 0.08 0.52 APR 20... 0.1 21 135 13 5 0.28 0.02 0.30 0.04 0.26 JUN 20... 1 0.38 0.02 0.40 0.04 1.40 AUG 25... 0.1 20 130 7.4 1 0.49 0.01 0.50 0.04 0.26 K • non-ideal count E estimate RIO GRANDE DE ARECIBO BASIN 50027250 RIO GRANDE DE ARECIBO BELOW LAGO DOS BOCAS NEAR FLORIDA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PROS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (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 NO3) AS P) AS AS) AS BA) AS B) AS CO) AS CR) AS CU) OCT 1988 19... 0.4 1.1 4.9 0.01 <1 <100 40 <1 1 <10 DEC 23... 0.3 1.0 4.4 0.02 FEB 1989 28... 0.6 1.2 5.3 0.05 APR 20... 0.3 0.6 2.7 0.02 <1 100 20 <1 <1 10 JUN 20... 1.4 1.8 8.0 0.02 AUG 25... 0.3 1.0 4.2 0.04 KANGA- 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- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1988 19... 800 <5 30 <0.1 <1 1 20 <0.01 3 <0.01 DEC 23... FEB 1989 28... APR 20... 80 <5 70 <0.1 <1 <1 <10 <0.01 8 0.05 JUN 20... AUG 15... 77 I I I I 78 RIO GRANDE DE ARECIBO BASIN 50027750 RIO GRANDE DE ARECIBO ABOVE ARECIBO. PR LOCATION.--Lat 18'25'29*, long 66'41'44', Hydrologic Unit 21010002, 0.8 mi (1.3 km) upstream from Rio Tanama, 4.0 mi (6.4 km) south of Arecibo and 6.7 mi (10.8 km) above mouth, and 10.2.mi (16.4 km) downstream from Lago Dos Bocas. DRAINAGE AREA.--200 mi' (520 km2 ), 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), fro topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. Flow regulated by Lago Dos Bocas Dam 10.2 i (16.4 km) upstream fro gage. Gage-height and precipitation satellite telemetry at station. AVERAGE DISCHARGE.--7 years (1983-89), 453 ft'/s (12.83 '/s), 30.76 in/yr (781 mm/yr), 328,200 acre-ft/yr (405 NO/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 45,800 ft'/s (1,300 m'/s), May 18, 1985, gage height, 18.22 ft (5.553 m), from floodmark, from rating curve extended above 2,400 ft'/s (68.0 m'/s) on basis of slope-area measurement of peak flow; minimum discharge, 30 ft'/s (0.850 m'/s), Mar. 30, 1986. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 4,300 ft'/s (122 10/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (m 3/s) (ft) (m) Date Time (W/s) (0/s) (ft) (m) Oct. 30 2400 *3.400 96.3 *8.41 2.563 No other peak greater than base discharge. Minimum daily discharge, 47 ft'/s (1.831 m'/s), Dec. 25. DISCHARGE. CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 915 1030 95 116 82 187 176 257 789 78 497 799 2 814 1080 112 91 148 98 478 189 858 119 664 172 3 892 1000 97 299 71 68 477 166 283 64 396 116 4 144 759 168 70 71 64 414 150 241 63 510 280 5 199 323 509 116 171 63 553 75 743 62 544 652 6 104 111 473 55 338 154 458 63 565 369 138 766 7 238 87 131 65 726 73 550 63 594 462 435 260 8 577 83 75 179 254 190 e450 277 127 156 244 214 9 347 96 82 67 137 153 e109 95 78 644 413 173 10 579 281 95 126 360 635 e650 161 70 322 577 174 11 640 111 141 105 176 369 e780 314 419 82 174 1580 12 143 595 67 310 204 94 298 427 139 288 112 810 13 534 398 76 55 459 235 133 91 72 486 84 445 14 248 162 102 59 145 107 85 105 81 557 98 373 15 269 585 156 581 629 64 352 479 69 672 122 1160 16 90 565 529 433 325 65 391 351 65 230 74 1050 17 75 284 319 263 298 65 251 233 64 526 73 885 18 130 567 276 204 81 62 383 74 93 635 73 1400 19 213 155 463 74 110 99 687 87 285 127 73 1110 20 123 559 192 78 76 331 698 76 90 334 95 578 21 652 99 156 69 166 89 471 68 454 494 262 453 22 756 285 53 62 223 129 275 492 585 141 886 598 23 1110 113 51 168 668 188 186 92 582 87 483 620 24 864 82 61 124 125 182 484 54 128 81 643 950 25 107 769 47 64 138 306 110 51 75 80 245 1130 26 83 269 70 97 134 380 417 53 485 248 91 689 27 79 638 210 135 300 372 297 50 134 96 71 787 28 448 765 161 248 467 425 262 50 65 83 225 892 29 499 438 160 159 --- 476 387 74 63 87 133 819 30 933 134 159 572 415 122 579 105 80 437 791 31 2220 --- 141 118 368 --- 449 --- 81 683 --- TOTAL 15025 12423 5427 5162 7082 6506 11384 5745 8401 7834 9555 20726 MEAN 485 414 175 167 253 210 379 185 280 253 308 691 MAX 2220 1080 529 581 726 635 780 579 858 672 886 1580 MIN 75 82 47 55 71 62 85 50 63 62 71 116 AC-FT 29800 24640 10760 10240 14050 12900 22580 11400 16660 15540 18950 41110 CFSM 3.46 2.96 1.25 1.19 1.81 1.50 2.71 1.32 2.00 1.81 2.20 4.93 IN. 3.99 3.30 1.44 1.37 1.88 1.73 3.02 1.53 2.23 2.08 2.54 5.51 CAL YR 1988 TOTAL 139308 MEAN 381 MAX 2920 MIN 47 AC-FT 276300 CFSM 2.72 IN. 37.02 WTR YR 1989 TOTAL 115270 MEAN 316 MAX 2220 MIN 47 AC-FT 228600 CFSM 2.26 IN. 30.63 e Estimated 79 RIO GRANDE DE ARECIBO BASIN 50027750 RIO GRANDE DE ARECIBO ABOVE ARECIBO, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS APRIL 1982 TO CURRENT YEAR STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TINE INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) OCT, 13 1002 81 267 26.0 MAY, 03 1003 87 252 25.0 DEC. 13 0947 76 277 24.5 JUN, 08 0920 120 201 25.0 . FEB. 09 1053 99 254 23.5 AUG. 02 0822 123 165 27.0 MAR. 14 1001 112 255 24.0 SEP, 08 1037 97 173 26.0 APR, 11 1009 127 242 24.0 I I I 80 RIO GRANDE DE ARECIBO BASIN 50028000 RIO TANAMA NEAR UTUADO, 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 i (1.9 ka) upstream fro natural tunnel, 1.5 mi (2.4 km) northeast of Angeles, and 5.8 mi (9.3 ka) northwest of Utuado. DRAINAGE AREA.--18.4 02 (47.7 km2). 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. Elevation of gage is 938.32 ft (286.00 m) above mean sea level. Datum of gage was lowered 3.00 ft (0.914 a) 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.--29 years (1961-89), 47.9 ft'is (1.356 m'/s), 35.35 in/yr (898 mm/yr), 34,700 acre-ft/yr (42.8 hm,/yr); median of yearly mean discharges, 47 ft'/s (1.33 m'/s). 34,000 acre-ft/yr (42 hm,/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 12.190 ft'/s (345 m3/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 m'/s) on basis of slope-area measurement of peak flow; minimum discharge, 6.6 ft'/s (0.187 m'/s), June 12. 1977. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 3,000 ft'is (85.0 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (03/s) (ft) (a) Date Time (ft'/s) (e/s) (ft) (m) Oct. 29 1530 *5.860 166 *14.64 4.462 Aug. 11 1515 3,300 93.4 12.09 3.685 Nov. 12 unknown 5,660 160 14.52 4.426 Sept. 9 1630 5,560 157 14.46 4.407 Minimum discharge, 12 ftlis (0.340 '/s), Feb. 23-25, Apr. 22-27, May 28,29. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 63 e50 e33 21 16 19 113 20 115 26 89 43 2 55 e45 32 20 16 18 51 29 69 41 55 39 3 51 e42 31 19 16 16 32 25 33 40 50 35 4 50 e40 31 19 15 15 23 15 59 89 39 33 5 60 00 30 19 15 15 19 15 37 40 30 37 6 49 e50 29 18 15 16 25 14 27 25 28 37 7 44 e35 29 18 15 16 25 16 24 26 77 32 8 42 e32 29 19 e14 15 18 16 22 22 42 70 9 41 e30 28 19 e15 15 17 98 22 21 31 319 10 41 e29 27 21 14 14 17 77 21 20 43 116 11 39 e28 27 23 14 14 16 47 21 61 229 72 12 37 e190 26 24 14 26 16 57 20 46 80 46 13 36 e110 24 19 14 24 17 39 20 33 e40 81 14 36 e70 24 19 14 37 17 23 19 33 e30 46 15 38 e45 25 18 30 27 15 20 19 25 e27 179 16 40 e36 26 18 34 17 14 18 19 22 e51 81 17 36 e34 26 18 17 29 14 17 30 23 e30 63 18 60 e33 26 17 16 25 14 16 24 30 e90 298 19 87 e32 25 18 15 27 13 15 72 21 e99 174 20 88 e31 25 18 14 22 14 15 28 21 e39 111 21 46 e30 24 17 14 22 14 15 22 90 e13 e90 22 56 e30 24 16 13 25 13 14 45 34 52 e80 23 43 e70 23 16 13 37 13 14 28 26 50 e70 24 38 e50 25 16 13 28 23 14 22 25 47 e64 25 50 el60 25 17 29 20 18 14 20 87 51 e60 26 102 79 23 29 51 11 12 16 19 40 109 e58 27 58 e50 22 24 38 17 23 14 38 29 64 e56 28 66 e40 22 29 21 19 23 13 23 30 44 e54 29 203 e38 22 17 --- 16 22 29 20 43 80 e52 30 97 e35 23 17 19 17 23 19 32 49 e52 31 e65 --- 22 16 71 --- 48 --- 61 40 --- TOTAL 1817 1614 808 599 525 698 668 806 957 1162 1858 2548 MEAN 58.6 53.8 26.1 19.3 18.7 22.5 22.3 26.0 31.9 37.5 59.9 84.9 MAX 203 190 33 29 51 71 113 98 115 90 229 319 MIN 36 28 22 16 13 14 12 13 19 20 27 32 AC-FT 3600 3200 1600 1190 1040 1380 1320 1600 1900 2300 3690 5050 CFSM 3.19 2.92 1.42 1.05 1.02 1.22 1.21 1.41 1.73 2.04 3.26 4.62 IN. 3.67 3.26 1.63 1.21 1.06 1.41 1.35 1.63 1.93 2.35 3.76 5.15 CAL YR 1988 TOTAL 14243 MEAN 38.9 MAX 403 MIN 12 AC-FT 28250 CFSM 2.11 IN. 28.80 WTR YR 1989 TOTAL 14060 MEAN 38.5 MAX 319 MIN 12 AC-FT 27890 CFSM 2.09 IN. 28.43 e Estimated 81 RIO GRANDE OE ARECIBO BASIN 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. 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, 1,680 mg/L September 18, 1989; minimum daily mean, 8.0 mg/L few days. SEDIMENT LOADS: Maximum daily, 2.890 tons (2,600 tonnes) September 18, 1989; minimum daily, 0.30 ton (0.27 tonne) several days. WATER-QUALITY DATA, WATER YEARS OCTOBER 1988 TO SEPTEMBER 1989 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1988 06... 1145 48 150 8.10 22.0 40 8.9 104 <10 K8700 5900 DEC 15... 1250 28 166 8.60 21.5 1.6 9.6 111 <10 50 210 FEB 1989 09... 1325 15 177 8.60 23.5 1.6 10.1 118 <10 45 K130 APR 11... 1015 17 170 8.20 20.0 12 8.6 97 61 K120 K100 JUN 05... 1130 36 143 7.40 22.0 63 8.4 98 20 4000 9900 AUG 21... 1200 41 160 7.90 25.0 5.9 8.1 99 10 340 570 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SLUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL. WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/1. TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1988 06... 58 10 14 5.5 6.9 0.4 2.0 75 <0.5 13 8.2 DEC 15... 59 FEB 1989 09... 58 APR 11... 68 6 17 6.2 9.1 0.5 2.1 62 <0.5 12 8.2 JUN OS... 43 AUG 21... 64 16 5.8 7.6 0.4 2.4 57 10 7.6 K = non-ideal count 82 RIO GRANDE DE ARECIBO BASIN 50028000 RIO TANAMA NEAR UTUADO, PR--Continued WATER-QUALITY DATA, WATER YEARS OCTOBER 1988 TO SEPTEMBER 1989 SOLIDS. RESIDUE FLUO- SILICA, SUM OF SOLIDS. TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2*NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 06... <0.1 23 101 13 39 0.88 0.02 0.90 0.04 0.26 DEC 15... 4 0.69 0.01 0.70 <0.01 FEB 1989 09... 3 <0.01 0.50 <0.01 APR 11... 0.1 24 116 5.3 91 <0.01 0.50 0.02 JUN 5... 60 0.99 0.01 1.00 0.02 0.78 AUG 21... 0.1 24 108 12 8 <0.01 0.80 0.02 0.88 CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA . NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN. GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (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 NO3) AS P) AS AS) AS BA) AS B) AS CO) AS CR) AS CU) NITRO- OCT 1988 6... 0.3 1.2 5.3 0.04 <1 <100 110 <1 12 20 DEC 15... 0.2 0.9 4.0 0.02 FEB 1989 09... 0.3 0.8 3.5 0.02 APR 11... <0.2 0.02 <1 100 20 2 2 <10 JUN 5... 0.2 1.2 5.3 0.02 AUG 21... 0.9 0.02 METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, MANGA- LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1988 6... 5400 80 <0.1 <1 <5 <1 10 <0.01 <1 0.03 DEC 15... FEB 1989 09... APR 11... 190 <5 20 <0.1 <1 <1 <10 <0.01 <1 0.02 JUN 05... AUG 21... RIO GRANDE DE ARECIBO BASIN 50028000 RIO TANAMA NEAR UTUADO, 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) OCTOBER NOVEMBER DECEMBER 1 63 99 19 e50 e60 e8.1 e33 e45 e4.0 2 55 75 11 e45 e25 e3.0 32 45 3.9 3 51 70 9.6 e42 e15 el.7 31 40 3.3 4 50 68 9.2 e40 e18 el.9 31 35 2.9 5 60 105 25 00 e100 e19 30 30 2.4 6 49 55 7.3 e50 e15 e2.0 29 28 2.2 7 44 40 4.8 e35 e15 e1.4 29 25 2.0 8 42 40 4.5 e32 e15 el.3 29 25 2.0 9 41 40 4.4 e30 e15 el.2 28 20 1.5 10 41 40 4.4 e29 e15 el.2 27 20 1.5 11 39 40 4.2 e28 .15 el.1 27 20 1.5 12 37 40 4.0 e90 e500 e256 26 20 1.4 13 36 40 3.9 e10 e240 ell 24 20 1.3 14 36 40 3.9 e70 e60 ell 24 20 1.3 15 38 42 4.3 e45 e25 e3.0 25 20 1.4 16 40 50 5.4 036 e12 .1.2 26 15 1.1 17 36 45 4.4 e34 e10 e.92 26 15 1.1 18 60 138 49 e33 e8 e.71 26 15 1.1 19 87 250 140 e32 e10 e.86 25 17 1.1 20 88 303 220 e31 e12 el.0 25 19 1.3 21 46 80 9.9 e30 e15 el.2 24 20 1.3 22 56 120 34 e30 e15 el.2 24 20 1.3 23 43 50 5.8 e70 e30 e5.7 23 20 1.2 24 38 45 4.6 e50 e50 e6.8 25 20 1.4 25 50 115 40 e160 e116 e2590 25 20 1.4 26 102 367 464 e79 e150 e32 23 19 1.2 27 58 100 16 e50 e70 e9.5 22 19 1.1 28 66 150 27 e40 e55 e5.9 22 19 1.1 29 203 673 1610 e38 e50 e5.1 22 19 1.1 30 97 200 52 e35 e48 e4.5 23 18 1.1 31 e65 e100 e18 22 18 1.1 TOTAL 1817 2819.6 1614 3049.49 808 51.6 e estimate 83 84 RIO GRANDE DE ARECIBO BASIN 50028000 RIO TANAMA NEAR UTUADO, 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) JANUARY FEBRUARY MARCH 1 21 18 1.0 16 12 .52 19 18 .92 2 20 18 .97 16 12 .52 18 18 .87 3 19 18 .92 16 12 .52 16 10 .43 4 19 18 .92 15 12 .49 15 10 .41 5 19 15 .77 15 12 .49 15 12 .49 6 18 15 .73 15 12 .49 16 15 .65 7 18 12 .58 15 14 .57 16 15 .65 8 19 12 .62 e14 e14 e.53 15 12 .49 9 19 12 .62 e15 e10 e.41 15 12 .49 10 21 15 .85 14 8 .30 14 12 .45 11 23 18 1.1 14 9 .34 14 12 .45 12 24 20 1.3 14 12 .45 26 40 2.8 13 19 19 .97 14 16 .60 24 25 1.6 14 19 18 .92 14 16 .60 37 101 56 15 18 15 .73 30 40 3.2 27 30 2.2 16 18 15 .73 34 50 4.6 17 15 .69 17 18 15 .73 17 20 .92 29 53 13 18 17 15 .69 16 20 .86 25 35 2.4 19 18 10 .49 15 16 .65 27 40 2.9 20 18 10 .49 14 15 .57 22 30 1.8 21 17 10 .46 14 10 .38 22 25 1.5 22 16 10 .43 13 10 .35 25 55 17 23 16 12 .52 13 10 .35 37 92 26 24 16 16 .69 13 9 .32 28 40 3.0 25 17 20 .92 29 44 8.5 20 15 .81 26 29 44 7.2 51 145 64 17 17 .78 27 24 45 6.2 38 81 12 17 20 .92 28 29 30 2.3 21 20 1.1 19 17 .87 29 17 19 .87 --- --- --- 16 16 .69 30 17 18 .83 19 15 .77 31 16 15 .65 71 380 297 TOTAL 599 37.20 525 104.63 698 439.03 e = estimate 85 RIO GRANDE DE ARECIBO BASIN 50028000 RIO TANAMA NEAR UTUADO, 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 1 113 501 353 20 35 1.9 115 513 806 2 51 98 22 29 50 3.9 69 128 43 3 32 30 2.6 25 30 2.0 33 50 4.5 4 23 22 1.4 15 15 .61 59 168 71 5 19 18 .92 15 14 .57 37 40 4.0 6 25 35 2.4 14 12 .45 27 15 1.1 7 25 25 1.7 16 12 .52 24 12 .78 8 18 17 .83 16 12 .52 22 10 .59 9 17 15 .69 98 562 936 22 10 .59 10 17 18 .83 77 208 94 21 10 .57 11 16 17 .73 47 90 11 21 10 .57 12 16 15 .65 57 191 121 20 10 .54 13 17 15 .69 39 50 5.3 20 10 .54 14 17 10 .46 23 15 .93 19 11 .56 15 15 10 .41 20 12 .65 19 11 .56 16 14 10 .38 18 12 .58 19 20 1.0 17 14 12 .45 17 12 .55 30 30 2.4 18 14 13 .49 16 15 .65 24 20 1.3 19 13 12 .42 15 18 .73 72 292 236 20 14 12 .45 15 15 .61 28 30 2.3 21 14 12 .45 15 15 .61 22 20 1.2 22 13 10 .35 14 15 .57 45 128 66 23 13 13 .46 14 15 .57 28 55 4.2 24 23 35 2.2 14 17 .64 22 20 1.2 25 18 20 .97 14 20 .76 20 18 .97 26 12 15 .49 16 20 .86 19 18 .92 27 23 39 5.9 14 19 .72 38 103 40 28 23 25 1.6 13 18 .63 23 25 1.6 29 22 25 1.5 29 45 3.5 20 20 1.1 30 17 15 .69 23 30 1.9 19 15 .77 31 --- --- --- 48 77 20 --- --- --- TOTAL 668 406.11 806 1213.23 957 1295.86 86 RIO GRANDE DE ARECIBO BASIN 50028000 RIO TANAMA NEAR UTUADO, 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) JULY AUGUST SEPTEMBER 1 26 40 4.9 89 277 185 43 62 9.8 2 41 76 16 55 80 12 39 55 5.8 3 40 89 29 50 85 21 35 38 3.6 4 89 426 582 39 65 6.8 33 32 2.9 5 40 75 8.1 30 50 4.1 37 30 3.0 6 25 20 1.4 28 35 2.6 37 20 2.0 7 26 15 1.1 77 276 254 32 18 1.6 8 22 12 .71 42 50 5.7 70 157 85 9 21 11 .62 31 34 2.8 319 2170 8440 10 20 15 .81 43 73 15 116 328 186 11 61 131 52 229 1080 5190 72 120 23 12 46 100 22 80 86 21 46 60 7.5 13 33 40 2.5 e40 e30 e3.2 81 294 328 14 33 40 3.6 e30 e28 e2.3 46 70 8.7 15 25 20 1.4 e27 e29 e2.1 179 929 3370 16 22 20 1.2 e51 e108 e35 81 150 33 17 23 25 1.6 e30 e40 e3.2 63 100 17 18 30 30 2.4 e90 e247 e128 298 1680 2890 19 21 20 1.1 e99 e293 e164 174 482 249 20 21 20 1.1 e39 e50 e5.3 111 150 45 21 90 564 1180 e73 e181 e130 e90 e125 e30 22 34 45 4.1 52 80 11 e80 e110 e24 23 26 35 2.5 50 70 9.5 e70 e110 e21 24 25 35 2.4 47 70 8.9 e64 e100 e17 25 87 292 251 51 50 6.9 e60 e90 e15 26 40 50 5.4 109 519 1090 e58 e90 e14 27 29 20 1.6 64 110 19 e56 e80 e12 28 30 18 1.5 44 65 7.7 e54 e70 e10 29 43 86 36 80 242 172 e52 e70 e9.8 30 32 50 4.3 49 70 9.3 e52 e70 e9.8 31 61 217 186 40 50 5.4 --- --- --- TOTAL 1162 2408.34 1858 7532.8 2548 15873.5 YEAR 14060 31434.39 e . estimate 87 RIO GRANDE DE ARECIBO BASIN 50028400 RIO TANAMA AT CHARCO HONDO, PR LOCATION.--Lat 18°24'52", long 66°42'52", 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' (149.2 km'). 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.--9 years (1969-71,81-89), 86.6 ft'/s (2.452 m'/s), 20.42 in/yr (519 mm/yr), 62,740 acre-ft/yr (77.4 hoP/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 15,000 ft'/s (425 mi/s), May 18, 1985, gage height, 17.95 ft (5.471 m), from floodmark, from rating curve extended above 1,000 ft'/s (28.3 110/s) on basis of step-backwater analysis; minimum discharge, 3.3 ft'is (0.093 m'/s), May 28,29, 1989. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 2,000 ft'/s (56.6 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (0/s) (ft) (m) Date Time (W/s) (10/s) (ft) (m) iov. 12 1900 *3,420 96.8 *11.88 3.621 Sept. 9 1845 2,770 78.4 11.14 3.395 Aug. 11 1800 2,040 57.8 10.19 3.106 Sept. 30 1930 2,130 60.3 10.32 3.146 Minimum discharge, 3.3 ft'/s (0.093 m'/s), May 28,29. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 e90 146 46 27 16 15 167 15 168 4.9 29 e42 2 127 115 46 27 15 15 132 23 126 14 35 e45 3 e74 102 41 27 15 13 63 15 26 13 12 e40 4 e72 95 41 26 14 13 39 5.9 32 43 18 e36 5 e86 158 42 26 14 13 21 5.6 33 31 10 e35 6 e72 127 41 25 13 14 16 5.0 15 12 8.8 e38 7 e64 81 39 25 13 14 22 6.6 12 11 27 e38 8 e60 e60 41 25 13 13 14 7.0 11 14 26 e33 9 e60 e56 41 25 13 13 e12 64 10 8.8 15 336 10 81 e54 39 26 12 12 ell 43 9.8 7.2 18 224 11 e58 e52 39 26 12 12 e12 44 9.5 9.3 200 226 12 e54 296 38 28 11 15 11 20 8.8 25 95 76 13 e52 e140 38 23 12 25 11 38 8.0 76 e35 75 14 52 e100 37 22 12 14 13 14 8.9 66 e30 83 15 63 e70 37 21 14 28 11 11 7.6 12 e30 146 16 71 e62 36 20 31 15 11 8.9 7.5 9.2 e31 109 17 55 e60 35 20 16 14 11 7.7 10 9.3 e40 59 18 51 e58 35 19 15 21 12 7.1 12 19 75 368 19 102 e56 34 19 14 30 12 7.2 38 43 176 341 20 248 e54 34 20 12 53 13 6.7 26 26 85 152 21 183 e54 33 19 12 22 14 6.5 11 52 e36 163 22 137 e54 33 19 12 11 13 6.3 11 25 86 128 23 133 82 33 18 11 19 12 5.4 21 9.2 e48 98 24 73 56 33 17 11 19 13 5.7 11 9.2 e70 318 25 61 186 36 17 13 12 18 4.8 14 50 150 565 26 109 146 32 21 35 12 12 6.6 5.4 25 225 177 27 107 64 31 28 67 11 14 4.5 7.9 12 231 279 28 64 53 29 25 21 12 21 4.2 19 9.4 111 242 29 279 50 29 18 --- 11 26 7.8 9.4 6.3 137 144 30 341 47 30 17 12 21 27 11 15 107 269 31 296 --- 29 16 29 --- 57 --- 16 e50 --- TOTAL 3375 2734 1128 692 469 532 778 490.5 699.8 682.8 2246.8 4885 MEAN 109 91.1 36.4 22.3 16.7 17.2 25.9 15.8 23.3 22.0 72.5 163 MAX 341 296 46 28 67 53 167 64 168 76 231 565 MIN 51 47 29 16 11 11 11 4.2 5.4 4.9 8.8 33 AC-FT 6690 5420 2240 1370 930 1060 1540 973 1390 1350 4460 9690 CFSM 1.89 1.58 .63 .39 .29 .30 .45 .27 .40 .38 1.26 2.83 IN. 2.18 1.77 .73 .45 .30 .34 .50 .32 .45 .44 1.45 3.15 CAL YR 1988 TOTAL 22376 MEAN 61.1 MAX 703 MIN 10 AC-FT 44380 CFSM 1.06 IN. 14.45 WTR YR 1989 TOTAL 18712.9 MEAN 51.3 MAX 565 MIN 4.2 AC-FT 37120 CFSM .89 IN. 12.09 e Estimated 88 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 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) OCT, 13 1314 50 267 24.5 APR, 11 1230 11 288 23.0 DEC 13 1237 37 275 24.5 MAY, 03 1235 11 254 23.0 JAN, 13 0801 17 285 21.0 JUN, 08 1211 10 212 25.0 FEEL 09 1241 12 255 22.0 AUG, 02 1008 24 135 24.5 MAR, 14 1240 13 281 22.5 SEP, 08 1340 21 176 28.0 I I 89 RIO GRANOE OE ARECIBO BASIN 50029000 RIO GRANDE DE ARECIBO AT CENTRAL CAMBALACHE. PR WATER-QUALITY RECORDS LOCATION.--lat 18'27'20'. long 66'42'10'. Hydrologic Unit 21010002, at bridge on unimproved road, about 500 ft (152 a) upstream from Central Cambalache. near Highway 2. 8.3 mi (13.4 ka) downstream from Dos Bocas Reservoir, 1.9 i (3.1 km) downstream from Rio Tanana and 1.6 ni (2.6 ka) southeast of Arecibo. DRAINAGE AREA.--200 i' (520 ka'). approximately. PERIOD OF RECORD.--Water years 1963-66, 1969 to current year. D1S- OXYGEN. OXYGEN COLI- STREP- tHARGE. SPE- D1S- DEMAND. FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL. FECAL. CUBIC CON- PH TEMPER- TUR- OXYGEN. (PER- ICAL 0.1 KF AGAR FEET DUCT- (STAND- ATURE 810- 01S- CENT (HIGH UM-MF (COLS. DATE TIME. PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1988 21... 1120 339 267 7.50 23.0 68 8.1 94 13 5600 10000 OEC 23... 1230 107 298 7.80 25.0 30 8.1 96 12 K720 480 FE8 1989 23... 1015 152 250 7.70 23.0 1.7 7.0 80 <10 K1000 600 APR 19... 0940 160 233 8.10 23.0 2.4 8.8 102 57 260 K140 JUN 23... 0845 E200 281 7.70 23.0 13 7.0 80 14 K1000 600 AUG 16... 1100 115 281 7.90 26.5 8.4 8.5 104 15 K1700 480 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SIUM. SODIUM. AD- SIUM, WAT WH SULFATE RIDE. TOTAL WH WAT DIS- DIS- DIS- SORP- 01S- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLO SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1988 21... 120 4 42 3.9 5.3 0.2 1.8 120 <0.5 9.0 7.2 DEC 23... 130 FEB 1989 23... 97 APR 19... 100 4 31 6.4 11 0.5 2.3 100 <0.5 13 10 JUN 23... 97 AUG 16... 130 41 5.5 8.3 0.3 1.5 110. 10 9.7 SOLIDS. RESIDUE FLUO- SILICA. SUM OF SOLIDS. TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE. 01S- CONSTI- DIS- AT 105 GEM. GEN. GEN, GEN. GEN. DIS- SOLVED TUENTS. SOLVED DEG. C. NITRATE NITRITE NO2PNO3 AMMONIA ORGANIC SOLVED (MG/L 01S- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 21... 0.1 9.1 149 136 174 0.68 0.02 0.70 J.04 0.16 DEC 23... 40 0.49 0.01 0.50 0.03 0.27 FEB 1989 23... 2 <0.01 0.40 0.02 0.48 APR 19... 0.1 18 152 66 8 0.31 0.09 0.40 0.03 0.37 JUN 23... 15 0.39 0.01 0.40 0.05 0.45 AUG 16... 0.1 15 162 50 21 0.58 0.02 0.60 0.03 0.67 K • non-ideal count E • estimate 90 RIO GRANDE DE ARECIBO BASIN 50029000 RIO GRANDE DE ARECIBO AT CENTRAL CAMBALACHE. PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (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 NO3) AS P) AS AS) AS BA) AS 8) AS CO) AS CR) AS CU) OCT 1988 21... 0.2 0.9 4.0 0.05 <1 <100 60 <1 10 10 DEC 23... 0.3 0.8 3.5 0.05 FEB 1989 23... 0.5 0.9 4.0 0.02 APR 19... 0.4 0.8 3.5 0.03 <1 100 50 <1 <1 20 JUN 23... 0.5 0.9 4.0 0.03 AUG 16... 0.7 1.3 3.9 0.01 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- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1988 21... 6000 <5 180 <0.1 <1 1 20 <0.01 3 <0.01 DEC 23... FEB 1989 23... APR 19... 280 <5 20 <0.1 <1 <1 <10 <0.01 <1 0.04 JUN 23... AUG 16... 91 1.206 BA RC ELONETA 038 • 205 Drainage boundary Ria Grande de Arecibo basin Island Rio inobo'n basin / Map area j .AGUADFL L A CIMAYASOEZ PONCE. L ANTIC OCEAN • 207 VEGA BAJA I MANAT • VEGA ALTA N .210 Drainage boundaries indeterminate in limestone terrane 035950 / i c Limestone • Igneous and 0350 MOROVIS sedimentary rocks Rio Cibuco basin Monai-..,. \-1 (.. (r-Drainage boundary 3 Rio de lo biota basin 290 • Rio •• .."""'Canal de Aceitunas and J00000 "Rib Coanto -Neitunnet to Ri`o Jacaguas basin ) bow EXPLANATION A 0350 SURFACE-WATER STATION AND NUMBER V 0307 QUALITY-OF-WATER STATION AND NUMBER • 210 WELL AND WELL NUMBER ass dtiAll 111032290 LAKE-ELEVATION STATION 0 t 2 3 4 KILOMETERS S Figure 15.--Rio Grande de Manati basin. I 92 RIO GRANDE DE MANATI BASIN 50030460 RIO OROCOVIS AT OROCOVIS, PR LOCATION.--Lat 18'13'25". long 66°23'34". Hydrologic Unit 21010001, on right bank, 0.4 mi (0.6 km) south of junction of Highways 155 and 156 in Orocovis, 600 ft (183 a) upstream fro Rio Batijas, and 250 ft (76 m) upstream from bridge on Highway 599. DRAINAGE AREA.--5.03 mi' (13.03 km2). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--April 1981 to September 1982, October 1988 to September 1989. GAGE.--Water-stage recorder. Elevation of gage is 500 ft (152 a) from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. Low flow affected by diversions for water supply. Gage-height and precipitation satellite telemetry at station. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 2,290 ft'/s (64.8 m 3/s), May 26, 1981, gage height. 11.52 ft (3.511 m); minimum discharge 0.74 ft'is (0.21 10/s), Sept. 4, 1982. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 500 ft'is (14.2 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (fts/s) (10/s) (ft) (m) Date Time (ft'/s) (10/s) (ft) (a) Oct. 30 1815 651 18.4 8.46 2.579 Sept. 10 1700 *2,250 63.7 *11.47 3.496 Aug. 22 1600 601 17.0 8.32 2.536 Sept. 18 1015 1,800 51.0 10.79 3.289 Minimum discharge, .94 ft'is (0.027 m'/s), Apr. 26. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 12 5.0 1.9 1.6 1.1 1.3 3.9 1.1 3.2 1.7 2.2 6.1 2 5.4 2.9 1.7 1.6 1.2 1.2 2.6 1.1 2.7 1.8 2.2 3.1 3 4.4 2.1 1.6 1.5 1.1 1.2 1.6 1.1 1.9 2.1 6.3 2.3 4 4.1 1.8 1.6 1.5 1.1 1.2 1.4 1.1 5.5 1.9 6.3 1.7 5 3.5 1.6 1.6 1.5 1.2 1.2 1.3 1.1 3.3 1.9 6.9 2.2 6 3.1 1.6 1.5 1.4 1.2 1.3 1.2 1.3 1.5 1.9 2.1 1.3 7 2.8 1.6 1.8 1.4 1.3 1.4 1.2 1.7 1.3 2.1 2.1 1.5 8 2.7 1.5 1.9 1.5 1.7 1.3 1.2 1.8 1.2 1.9 2.0 3.0 9 2.7 1.5 1.8 1.5 1.3 1.2 1.2 1.4 1.1 1.8 2.1 16 10 3.4 1.4 1.8 1.5 1.1 1.2 1.3 1.4 1.2 1.8 2.3 222 11 2.9 1.3 1.6 2.1 1.1 1.2 1.3 1.2 1.2 1.9 2.2 50 12 2.3 1.4 1.5 1.7 1.1 1.7 1.2 1.2 1.3 2.0 2.2 19 13 2.2 2.2 1.5 1.7 1.1 4.8 1.2 1.1 1.3 1.9 8.4 12 14 2.4 2.1 1.6 1.4 1.3 1.6 1.2 1.1 1.3 1.9 7.9 8.0 15 2.3 1.5 1.5 1.4 4.9 1.4 1.2 1.1 1.4 1.9 2.4 6.8 16 2.1 1.5 1.5 1.5 4.0 4.7 1.1 1.2 1.5 1.8 2.2 5.1 17 2.1 5.6 1.6 1.5 8.2 3.2 1.2 1.1 2.1 1.8 2.2 7.1 18 1.9 3.4 1.8 1.5 3.2 1.9 1.2 1.1 2.1 2.2 2.9 e420 19 1.9 2.2 1.6 1.5 2.0 1.5 1.1 1.1 1.5 2.0 2.2 e70.0 20 1.9 1.7 1.5 1.5 1.7 1.4 1.1 1.2 1.5 2.8 2.4 e40.0 21 1.9 1.6 1.5 1.4 1.6 1.4 1.1 1.1 1.5 2.1 2.4 e30.0 22 1.9 16 1.5 1.4 1.6 1.3 1.2 1.3 1.6 3.2 78 e22.0 23 2.1 6.9 1.6 1.4 1.5 1.3 1.2 1.1 1.6 2.2 30 e40.0 24 1.9 3.0 1.8 1.4 1.4 1.2 1.0 1.8 2.3 2.5 8.5 e52.0 25 1.9 12 1.6 1.4 1.3 1.2 1.0 1.7 1.6 4.8 5.3 e20.0 26 4.9 6.0 1.6 1.5 2.2 1.2 1.1 2.0 1.6 3.2 5.3 e12.0 27 4.4 4.3 1.5 1.4 1.9 1.2 1.3 1.6 1.6 2.9 77 e9.00 28 2.2 3.3 1.5 1.2 1.4 1.2 1.1 1.3 1.6 3.5 35 e32.0 29 42 2.4 1.9 1.2 --- 1.3 1.1 1.3 1.6 1.9 31 e25.0 30 74 2.0 3.3 1.2 1.4 1.1 1.3 1.7 2.0 27 e50.0 31 26 --- 1.8 1.2 1.4 --- 4.9 --- 2.1 12 --- TOTAL 229.3 101.4 52.5 45.5 53.8 50.0 39.9 43.9 54.8 69.5 381.0 1189.20 MEAN 7.40 3.38 1.69 1.47 1.92 1.61 1.33 1.42 1.83 2.24 12.3 39.6 MAX 74 16 3.3 2.1 8.2 4.8 3.9 4.9 5.5 4.8 78 420 MIN 1.9 1.3 1.5 1.2 1.1 1.2 1.0 1.1 1.1 1.7 2.0 1.3 AC-FT 455 201 104 90 107 99 79 87 109 138 156 2360 CFSM 1.47 .67 .34 .29 .38 .32 .26 .28 .36 .45 2.44 7.88 IN. 1.70 .75 .39 .34 .40 .37 .30 .32 .41 .51 2.82 8.79 WTR YR 1989 TOTAL 2310.80 MEAN 6.33 MAX 420 MIN 1.0 AC-FT 4580 CFSM 1.26 IN. 17.09 e Estimated RIO GRANDE DE MANATI BASIN 50030460 RIO OROCOVIS AT OROCOVIS, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.-- OCTOBER 1988 TO SEPTEMBER 1989 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) OCT, 12 1049 2.1 277 24.5 APR, 10 0935 1.3 304 21.0 DEC, 08 0956 2.1 285 20.0 MAY, 01 0933 1.0 306 21.5 JAN, 24 0945 1.4 295 19.5 JUN, 01 1018 2.0 177 21.0 FEB, 08 1020 2.0 302 20.5 AUG, 01 0908 14 221 23.0 MAR, 16 0947 1.4 300 21.0 93 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 568, 1.0 mi (1.6 km) north of Orocovis plaza. DRAINAGE AREA.--10.1 mil (26.2 km2 ). PERIOD OF RECORD.--Water year 1979 to current year. DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1988 12... 1400 6.6 322 8.50 23.0 3.5 8.6 104 12 K1300 520 DEC 08... 1310 6.9 297 8.40 22.0 2.2 8.5 100 <10 K1200 300 FEB 1989 15... 1210 18 278 8.10 19.5 550 8.5 96 17 K320000 K180000 APR 17... 1245 4.8 316 8.50 24.0 1 9.4 116 <10 480 K150 JUN 15... 1500 3.1 364 8.30 23.0 0.5 8.5 102 11 K190 600 AUG 10... 1500 3.0 350 8.20 25.0 1.8 8.2 103 17 280 640 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- UNITY CHLO- NESS NONCARB CALCIUM SLUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE. TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLO SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1988 12... 140 8 33 13 14 0.5 1.7 120 2.2 12 14 DEC 08... 120 FEB 1989 15... 110 APR 17... 140 1 36 13 15 0.6 1.6 140 <0.5 9.2 16 JUN 15... 140 AUG 10... 150 7 39 13 16 0.6 1.6 140 14 15 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 12... 0.1 33 198 3.5 7 1.39 0.01 1.40 0.01 0.39 DEC 08... 5 <0.01 1.20 <0.01 FEB 1989 15... 704 0.97 0.03 1.00 0.08 0.72 APR 17... 0.1 32 209 2.7 15 <0.01 0.70 0.02 0.28 JUN 15... 4 <0.01 1.00 0.02 0.28 AUG 10... 0.2 34 219 1.8 2 <0.01 1.00 0.03 0.27 K • non-ideal count 95 RIO GRANDE DE MANATI BASIN 50030700 RIO OROCOVIS NEAR OROCOVIS, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (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 NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1988 12... 0.4 1.8 8.0 0.22 1 <100 20 <1 1 <10 DEC 08... 0.5 1.7 7.5 0.18 FEB 1989 15... 0.8 1.8 8.0 0.33 APR 17... 0.3 1.0 4.4 0.30 <1 100 40 1 1 10 JUN 15... 0.3 1.3 5.8 0.38 AUG 10... 0.3 1.3 5.8 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- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1988 12... 230 <5 10 <0.1 <1 <1 10 <0.01 <1 0.04 DEC 08... FEB 1989 15... APR 17... 200 <5 30 <0.1 <1 <1 <10 <0.01 8 0.04 JUN 15... AUG 10... I 96 RIO GRANDE DE MANATI BASIN 50031200 RIO GRANDE 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 fro 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' (143.0 km'). 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.--24 years (1966-89), 104 fti/s (2.945 10/s), 25.59 in/yr (650 mm/yr), 75,350 acre-ft/yr (92.9 hm'/yr); median of yearly mean discharges, 89 ftqs (2.52 m'/s), 64,500 acre-ft/yr (80 hm'/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 48,000 ft'/s (1,359 mi/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 ft'/s (0.125 m'/s), Apr 15, 1984. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 3,500 ft'is (99.1 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (W/s) (23/s) (ft) (m) Date Time (W/s) (40/s) (ft) (m) Sept. 18 1145 *7,120 202 *7.09 2.161 No other peak greater than base discharge. Minimum daily discharge, 8.0 ft'is (0.226 m3/s), Aug. 10. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 125 96 50 48 30 39 79 29 85 21 19 33 2 64 69 48 42 29 36 79 28 76 22 14 26 3 59 55 46 39 29 34 78 28 60 22 14 23 4 58 51 44 36 30 34 69 25 113 23 27 19 5 56 51 43 35 29 34 46 26 51 22 39 21 6 47 51 42 34 28 35 37 31 33 29 21 29 7 47 49 43 35 27 41 33 30 25 38 12 31 8 45 49 44 40 34 36 30 33 24 31 9.7 49 9 47 50 43 65 36 33 28 28 21 27 8.7 111 10 83 47 46 55 30 32 28 31 19 25 8.0 387 11 63 45 46 61 28 30 31 26 20 26 17 315 12 44 45 43 78 27 35 28 57 19 27 19 119 13 42 56 42 76 29 66 29 38 19 24 32 70 14 42 68 41 52 29 47 27 38 18 32 17 85 15 53 49 43 43 84 39 25 26 18 33 13 88 16 41 48 43 47 134 42 25 23 18 23 11 55 17 39 79 41 44 231 82 27 21 21 20 11 135 18 38 98 42 41 145 47 26 20 29 20 22 1800 19 37 69 41 40 81 39 25 20 22 18 89 531 20 36 56 40 41 56 35 25 18 20 18 29 381 21 36 54 40 41 48 34 25 18 20 17 31 380 22 45 128 40 36 53 34 24 17 19 26 25 251 23 41 145 40 34 41 32 23 17 20 23 82 340 24 37 77 51 33 36 34 25 16 19 20 34 507 25 35 79 46 32 34 31 24 16 19 21 21 216 26 33 128 41 36 59 30 24 20 19 20 16 172 27 38 108 38 50 94 29 30 45 19 18 14 152 28 38 77 38 35 50 30 25 26 20 20 63 151 29 226 63 39 33 --- 30 24 23 20 18 29 174 30 417 55 74 34 57 32 23 20 14 59 123 31 228 --- 65 30 61 --- 35 --- 15 47 --- TOTAL 2240 2095 1383 1346 1561 1218 1031 832 906 713 853.4 6774 MEAN 72.3 69.8 44.6 43.4 55.7 39.3 34.4 26.8 30.2 23.0 27.5 226 MAX 417 145 74 78 231 82 79 57 113 38 89 1800 MIN 33 45 38 30 27 29 23 16 18 14 8.0 19 AC-FT 4440 4160 2740 2670 3100 2420 2040 1650 1800 1410 1690 13440 CFSM 1.31 1.27 .81 .79 1.01 .71 .62 .49 .55 .42 .50 4.09 IN. 1.51 1.41 .93 .91 1.05 .82 .69 .56 .61 .48 .58 4.57 CAL YR 1988 TOTAL 28954 MEAN 79.1 MAX 862 MIN 24 AC-FT 57430 CFSM 1.43 IN. 19.51 WTR YR 1989 TOTAL 20952.4 MEAN 57.4 MAX 1800 MIN 8.0 AC-FT 41560 CFSM 1.04 IN. 14.12 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 1988 TO SEPTEMBER 1989 DATE OCT 1988 TIME DIS- CHARGE, INST. CUBIC FEET PER SECOND SPE- CIFIC CON- DUCT- ANCE (US/CM) PH (STAND- ARD UNITS) TEMPER- ATURE WATER (DEG C) TUR- BID- ITY (NTU) OXYGEN, DIS- SOLVED (MG/L) OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) COLI- FORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) 12... 1050 44 265 8.00 24.0 6.5 8.3 99 21 530 330 DEC 08... 1020 44 257 8.10 22.5 5.1 8.7 101 <10 K150 250 FEB 1989 15... 0920 38 277 8.30 21.5 2.7 8.6 98 <10 320 570 APR 17... 1020 26 281 8.40 23.0 2.9 9.2 108 <10 45 64 JUN 15... 1230 17 318 8.40 26.0 6.3 8.4 104 12 K130 64 AUG 10... 1200 14 282 8.20 28.5 14 7.8 100 23 K180 45 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SIUM, SODIUM, AD- SIUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- D1S- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1988 12... 120 8 30 11 13 0.5 1.9 110 <0.5 9.7 13 DEC 08... 110 FEB 1989 15... 110 APR 17... 120 6 30 12 13 0.5 1.7 120 <0.5 7.1 14 JUN 15... 120 AUG 10... 120 2 28 11 13 0.5 1.9 110 10 14 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN. GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER FENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 12... 0.1 27 173 21 14 0.59 0.01 0.60 0.02 0.28 DEC 08... 10 <0.01 0.70 0.01 0.39 FEB 1989 15... 2 <0.01 0.30 0.02 0.38 APR 17... 0.1 27 176 12 3 <0.01 <0.10 0.02 0.18 JUN 15... 15 <0.01 <0.10 0.04 0.26 AUG 10... 0.1 31 177 6.7 16 <0.01 0.10 0.03 0.37 K = non-ideal count 97 98 RIO GRANDE DE MAMATI BASIN 50031200 RIO GRANDE DE MANATI NEAR MOROVIS, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTMBER 1989 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN. GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS A) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CO) AS CR) AS CU) OCT 1988 12... 0.3 0.9 4.0 0.07 ..1 <100 20 1 1 <10 DEC 08... 0.4 1.1 4.9 0.07 FEB 1989 15... 0.4 0.7 3.1 0.07 APR 17... 0.2 0.05 <1 100 40 1 <1 <10 JUN 15... 0.3 0.07 AUG 10... 0.4 0.5 2.2 0.06 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER. ZINC, LEME TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- CUM. RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (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) OCT 1988 12... 620 <5 30 <0.1 <1 1 20 <0.01 <1 0.02 DEC 08... FEB 1989 15... APR 17... 370 <5 20 <0.1 <1 1 <10 <0.01 6 0.02 JUN 15... AUG 10... 99 RIO GRANDE DE MANATI BASIN 50032290 LAGO EL GUINEO AT DAMSITE, PR LOCATION.--Lat 18°09'41", long 66°51'48", Hydrologic Unit 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 mil (4.248 km 2). ELEVATION RECORDS PERIOD OF RECORD.--May 1988 to current year. 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 hm') 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.1, 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 (38.1 m) to top of corewall. The uncontrolled morning-glory tunnel spillway crest has an elevation of 2,966 ft (904.03 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 2,949.85 ft (899.11 m), Apr. 11, 1989; minimun elevation, 2,919.79 ft (899.95 m), May 27, 1988. EXTREMES OBSERVED FOR CURRENT YEAR.--Maximum elevation, 2,949.85 ft (899.11 m), Apr. 11 ; minimun elevation, 2,922.43 ft (890.76 m), Sept. 8. Capacity Table (based on data from Puerto Rico Electric Power Authority) Elevation, in feet Contents, in acre-feet Elevation, in feet Contents, in acre-feet 2,872 0 2,943 1,029 2,919 361 2,950 1,308 2,925 491 2,960 1,798 ELEVATION (FEET NGVD), WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 OBSERVATION AT 24:00 VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 2940.40 2941.25 2945.56 2946.42 2946.05 2946.83 2948.67 2946.51 2943.23 A 2939.83 2927.94 2 2940.64 2940.88 2945.40 2946.49 2946.07 2946.86 2948.78 2946.21 2944.44 A 2938.55 2927.07 3 2939.52 2940.55 2945.55 2946.15 2946.11 2946.88 2948.22 2945.93 2944.88 A 2938.51 2927.16 4 2938.96 2940.75 2945.69 2945.82 2946.16 2946.90 2948.13 2945.61 2945.61 A 2937.42 2926.60 5 2938.37 2940.97 2945.41 2945.60 2946.18 2946.95 2948.17 2945.54 2945.53 A 2937.00 2926.54 6 2937.93 2941.17 2945.11 2945.09 2946.22 2947.00 2949.41 2945.63 2945.15 2944.16 2937.06 2925.66 7 2937.46 2941.12 2944.86 2945.16 2946.23 2947.03 2949.59 2945.81 2945.10 2944.42 2936.08 2924.23 8 2937.66 2941.29 2944.57 2945.25 2946.29 2947.05 2949.68 2945.77 2944.86 2944.48 2936.13 2922.90 9 2937.86 2940.99 2944.69 2945.12 2946.32 2947.07 2949.75 2945.78 2944.41 2944.52 2935.46 2924.90 10 2941.15 2940.65 2944.83 2945.20 2946.18 2946.97 2949.84 2945.85 2944.54 2944.56 2934.14 2926.25 11 2941.03 2940.32 2944.95 2945.27 2946.21 2946.97 2949.64 2945.79 2944.84 2945.03 2934.30 2925.81 12 2940.83 2940.52 2945.07 2945.31 2946.23 2948.38 2949.24 2945.74 2944.56 2945.11 2933.71 2927.18 13 2939.84 2943.93 2945.18 2945.37 2945.85 2947.80 2948.48 2945.80 2944.06 2945.09 2933.77 2927.85 14 2939.59 2943.79 2945.30 2945.43 2945.90 2947.92 2947.68 2945.87 2943.89 2945.15 2932.96 2928.16 15 2939.81 2943.53 2945.41 2945.48 2946.37 2947.98 2947.73 2945.33 2943.96 2945.40 2932.47 2927.49 16 2939.99 2943.29 2945.20 2945.55 2946.45 2948.25 2947.82 2945.12 2944.06 2945.44 2932.02 2927.70 17 2939.67 2943.52 2945.31 2945.61 2946.62 2948.37 2947.59 2944.89 2944.17 2945.48 2931.54 2927.72 18 2939.49 2943.27 2945.42 2945.67 2946.69 2948.43 2947.64 2944.94 2944.06 2945.52 2931.06 2936.51 19 2939.15 2943.46 2945.52 2945.74 2946.73 2948.61 2946.91 2944.71 2943.95 2945.48 2931.49 2937.50 20 2939.21 2943.63 2945.62 2945.78 2946.76 2948.12 2946.73 2943.60 2943.50 2944.53 2931.63 2937.53 21 2939.24 2943.37 2945.71 2945.84 2946.53 2948.21 2947.39 2943.66 2943.14 2943.50 2931.36 2938.74 22 2939.57 2943.82 2945.52 2945.88 2946.58 2947.82 2948.44 2942.89 2943.44 2942.88 2930.91 2939.50 23 2940.31 2943.65 2945.61 2945.92 2946.61 2947.87 2948.68 2942.61 2943.51 2942.92 2930.47 2942.01 24 2940.07 2943.57 2945.72 2945.97 2946.64 2947.71 2948.71 2942.66 2943.58 2942.54 2931.12 2942.60 25 2939.75 2945.63 2945.82 2946.01 2946.68 2947.76 2948.81 2942.48 2943.46 2942.14 2930.45 2945.11 26 2940.15 2945.91 2945.92 2946.07 2946.72 2947.80 2948.25 2942.39 2943.52 2941.97 2929.59 2945.99 27 2939.93 2946.13 2945.98 2946.09 2946.76 2947.83 2947.58 2942.48 2943.58 2941.54 2929.70 2946.53 28 2939.70 2945.91 2946.07 2946.13 2946.79 2947.87 2947.02 2942.55 2943.83 2941.12 2929.82 2946.70 29 2940.49 2945.98 2946.16 2946.17 --- 2948.07 2947.13 2942.45 A 2941.16 2930.00 2946.43 30 2941.61 2945.86 2946.26 2945.95 --- 2948.13 2947.37 2942.45 A 2941.04 2930.11 2946.30 31 2941.48 --- 2946.34 2946.00 --- 2948.55 --- 2942.26 --- 2940.81 2928.76 MEAN 2939.71 2942.96 2945.48 2945.73 2946.39 2947.68 2948.30 2944.49 --- 2933.14 2933.42 MAX 2941.61 2946.13 2946.34 2946.49 2946.79 2948.61 2949.84 2946.51 --- 2939.83 2946.70 MIN 2937.46 2940.32 2944.57 2945.09 2945.85 2946.83 2946.73 2942.26 --- 2928.76 2922.90 A No gage-height record. I I 100 RIO GRANDE DE MANATI BASIN 50032590 LAGO DE MATRULLAS 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 the town of Orocovis. DRAINAGE AREA.--4.46 (11.55 le). 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 (9.1 m) and a length of 710 ft (216 m), and has a maximum storage capacity of about 4,274 ac-ft. (5.220 hm 3) 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 irrigatin 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 (735.6 m), Sept. 30, 1989; minimum elevation 2,392.81 ft (729.3 ), Sept. 10, 1989. EXTREMES OBSERVED FOR CURRENT YEAR.--Maximum elevation, 2,413.49 ft (735.6 m), Sept. 30, minimum elevation 2,392.81 ft (729.3 ), Sept. 10. Capacity Table (based on data from Puerto Rico Electric Power Authority) Elevation, in feet Contents, in acre-feet Elevation, in feet Contents, in acre-feet 2,338 2 2,399 1,845 2,360 302 2,415 2,945 ELEVATION (FEET NGVD), WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 OBSERVATION AT 24:00 VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 2405.30 2404.07 2405.59 A 2404.37 2402.92 2400.08 2398.48 2396.35 2397.53 2402.23 2395.82 2 2405.57 2403.88 2405.30 A 2404.27 2402.63 2400.63 A 2396.48 2397.60 2401.80 2395.33 3 2405.45 2403.62 2405.32 A 2404.19 2402.33 2400.54 A 2396.59 2397.70 2401.50 2395.18 4 2405.18 2403.67 2405.47 A 2396.23 2402.30 2400.30 A 2397.39 2397.77 2401.14 2394.95 5 2404.86 2403.83 2405.32 2405.50 2404.29 2402.38 2400.03 A 2397.71 2397.88 2400.90 2394.68 6 2404.51 2404.02 2405.10 2405.58 2396.18 2402.21 2399.77 A 2397.68 2398.03 2400.90 2394.32 7 2404.17 2404.05 2404.89 2405.68 2396.04 2401.95 2399.54 A 2397.55 2398.29 2400.62 2393.85 8 2404.75 2404.11 2404.66 2405.80 2403.96 2401.68 2399.51 A 2397.38 2398.57 2400.27 2393.38 9 2405.15 2403.91 A 2405.75 2403.91 2401.40 2399.59 A 2397.18 2398.67 2399.88 2392.94 10 2405.12 2403.60 A 2405.65 2403.78 2401.08 2399.43 A 2397.20 2398.77 2399.42 2394.21 11 2404.93 2403.28 A 2405.63 2403.80 2401.03 2399.40 A 2397.28 2399.33 2399.08 2394.57 12 2404.63 2403.92 A 2405.54 2403.86 2401.31 2399.48 A 2397.19 2400.10 2398.72 2394.27 13 2404.31 2406.04 A 2405.43 2403.69 2401.64 2399.57 A 2397.00 2404.25 2398.61 2394.07 14 2403.97 2406.94 A 2405.49 2403.54 2401.50 2399.41 A 2396.78 2406.20 2398.30 2393.84 15 2403.98 2406.81 A 2405.59 2403.81 2401.30 2399.38 A 2396.49 2406.04 2397.91 2393.58 16 2404.13 2406.56 A 2405.58 2403.92 2401.16 2399.45 A 2396.17 2405.98 2397.57 2393.58 17 2403.91 2406.48 A 2405.48 2403.92 2401.03 2399.54 A 2396.13 2405.71 2397.28 2393.75 18 2403.62 2406.29 A 2405.36 2404.02 2401.04 2399.37 A 2396.25 2405.43 2396.97 2402.06 19 2403.31 2406.38 A 2405.24 2404.11 2401.12 2399.15 A 2396.40 2405.20 2397.12 2405.42 20 2402.92 2406.57 A 2405.11 2403.93 2400.93 2398.82 A 2396.51 2404.89 2397.26 2406.67 21 2402.54 2406.42 A 2405.14 2403.72 2400.63 2398.51 A 2396.61 2404.51 2397.14 2408.98 22 2402.49 2406.43 A 2405.23 2403.61 2400.60 2398.52 A 2396.71 2404.13 2396.85 2410.54 23 2402.66 2406.34 A 2405.15 2403.40 2400.40 2398.65 A 2396.82 2404.11 2396.54 2412.10 24 2402.51 2406.28 A 2405.02 2403.24 2400.36 2398.51 A 2396.92 2403.90 2397.17 2412.70 25 2402.16 2406.17 A 2404.88 2403.27 2400.45 2398.20 A 2397.02 2403.62 2397.60 2412.46 26 2402.00 2406.35 A 2404.75 2403.49 2400.52 2398.21 A 2397.11 2403.35 2397.29 2412.34 27 2401.94 2406.61 A 2404.65 2403.43 2400.47 2398.25 A 2397.20 2403.05 2397.24 2412.28 28 2401.68 2406.45 A 2404.67 2403.20 2400.38 2398.27 A 2397.29 2402.76 2397.09 2412.49 29 2402.09 2406.17 A 2404.76 2400.16 2398.41 A 2397.37 2402.75 2396.87 2412.37 30 2403.32 2405.88 A 2404.67 2399.89 2398.59 A 2397.46 2402.81 2396.63 2413.42 31 2404.12 --- A 2404.52 2399.64 --- A --- 2402.60 2396.28 --- MEAN 2403.78 2405.37 2402.97 2401.18 2399.24 2396.94 2401.98 2398.52 2401.20 MAX 2405.57 2406.94 2404.37 2402.92 2400.63 2397.71 2406.20 2402.23 2413.42 MIN 2401.68 2403.28 2396.04 2399.64 2398.20 2396.13 2397.53 2396.28 2392.94 A No gage-height record. I 101 RIO GRANDE DE MANATI BASIN 50034000 RIO BAUTA NEAR OROCOVIS, PR 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 mil (43.3 km 2 ). 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 September 1989. GAGE.--Water-stage recorder and crest-stage gage. Elevation 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.--13 years (1971-1982, 89) 37.1 ft'is (1.051 m'/s) 30.17 in/yr (766 mm/yr), 26,880 acre-ft/yr (33.14 hm'/yr); median of yearly mean discharges, 27 ft'is (0.76 m'/s), 19,600 acre-ft/yr (24 hm 3/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 17,800 ft3/s (504 m'/s), Oct. 9, 1970, gage height, 21.9 ft (6.68 ), from floodmark, from rating curve extended above 100 ft'/s (2.83 m'is) on basis of step-backwater analysis by U.S. Bureu of Reclamation; minimum discharge 2.8 ft'is (0.079 m3/s), July 23, 1977. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,500 ft'is (42.5 m 3/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft3/s) (20/s) (ft) (m) Date Time (ft3/s) (m 3/s) (ft) (m) Sept. 10 1730 2,310 65.4 12.12 3.694 Sept. 18 1030 *3,760 106 *13.28 4.048 Minimum discharge, 5.8 ft3/s (0.164 m3/s), Apr. 10. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 54 32 14 9.4 6.7 8.6 14 9.3 27 14 14 11 2 27 23 13 9.0 6.7 8.4 19 9.1 27 14 14 9.2 3 21 18 13 8.8 6.7 8.2 9.9 8.7 14 14 15 8.3 4 20 16 12 8.5 6.7 8.3 8.2 8.5 64 13 29 7.6 5 17 14 12 8.5 6.6 8.2 7.2 8.6 62 14 36 8.8 6 15 14 12 8.5 6.5 8.7 6.6 9.1 29 16 19 9.8 7 14 14 12 8.2 6.5 8.8 6.3 9.1 21 15 18 7.9 8 20 13 12 9.0 8.6 8.5 6.2 10 e19 15 16 10 9 21 13 12 9.6 7.9 8.4 6.1 8.7 e18 14 15 32 10 23 12 12 9.0 6.9 8.1 6.2 8.7 e17 13 15 e538 11 22 12 12 12 6.7 7.9 6.4 8.4 el6 15 19 e377 12 16 24 11 10 6.6 14 6.4 8.2 e16 19 21 e42 13 15 61 11 9.6 6.7 26 6.7 8.2 15 79 21 26 14 13 55 10 8.6 7.1 13 6.4 8.2 15 52 18 17 15 13 26 11 8.3 33 11 6.5 8.1 15 19 15 14 16 13 19 10 8.3 27 13 6.5 8.0 15 15 15 11 17 12 31 10 8.1 25 18 6.6 7.9 15 17 15 13 18 11 35 11 7.9 18 11 6.6 7.7 18 15 18 961 19 11 24 10 7.9 12 9.7 6.7 7.7 23 15 24 376 20 11 20 10 8.0 10 8.7 6.7 7.5 17 16 20 204 21 11 16 10 7.5 9.5 8.5 7.0 7.6 15 15 19 191 22 12 39 10 7.4 9.5 8.1 8.5 7.6 16 14 41 112 23 12 38 10 7.2 9.0 7.8 8.0 7.5 15 14 38 229 24 11 24 10 e7.1 8.8 7.4 7.8 7.5 15 15 52 298 25 11 33 9.7 e7.1 8.5 7.3 7.8 7.4 15 15 30 83 26 11 36 9.3 7.9 10 7.1 9.1 17 14 14 13 52 27 13 27 9.1 8.5 13 6.9 11 16 14 14 24 39 28 11 20 8.9 7.3 9.4 6.8 9.1 9.5 13 15 30 184 29 50 17 11 7.4 --- 6.9 8.7 9.1 14 14 20 136 30 120 15 14 7.1 7.6 9.8 10 14 13 27 303 31 69 --- 11 6.9 8.8 --- 27 --- 14 15 --- TOTAL 700 741 343.0 258.6 299.6 299.7 242.0 295.9 608 561 686 4310.6 MEAN 22.6 24.7 11.1 8.34 10.7 9.67 8.07 9.55 20.3 18.1 22.1 144 MAX 120 61 14 12 33 26 19 27 64 79 52 961 MIN 11 12 8.9 6.9 6.5 6.8 6.1 7.4 13 13 13 7.6 AC-FT 1390 1470 680 513 594 594 480 587 1210 1110 1360 8550 CFSM 1.35 1.48 .66 .50 .64 .58 .48 .57 1.21 1.08 1.33 8.60 IN. 1.56 1.65 .76 .58 .67 .67 .54 .66 1.35 1.25 1.53 9.60 WTR YR 1989 TOTAL 9345.4 MEAN 25.6 MAX 961 MIN 6.1 AC-FT 18540 CFSM 1.53 IN. 20.82 e Estimated 102 RIO GRANDE DE MANATI BASIN 50034000 RIO BAUTA NEAR OROCOVIS, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.-- OCTOBER 1988 TO SEPTEMBER 1989 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) OCT, 12 1338 15 198 25.0 APR, 10 1217 6.2 225 23.5 DEC, 08 1254 12 205 21.5 MAY, 01 1330 9.3 227 24.5 JAN, 24 1200 7.1 216 22.0 JUN, 01 1413 16 164 24.0 FEB, 02 1213 99 249 24.5 AUG, 01 1134 1.8 168 27.0 MAR, 16 1321 11 200 24.0 SEP, 06 1358 9.2 134 27.0 I I I I I I I RIO GRANDE DE MANATI BASIN 50035000 RIO GRANDE DE MANATI AT CIALES, PR LOCATION.--Lat 18°19'26*, 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 i 2 (332 km 2 ), excludes 6.0 i 2 (15.5 km 2 ), the runoff from which is diverted - through El Guineo and de Matrullas reservoirs. WATER-DISCHARGE RECORDS PERIOD OF 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 i (2.6 km) downstream, drainage area 132 mi 2 (342 km 2 ). 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 i (2.6 km) downstream at different datum. REMARKS.--Records fair except those for estimated daily dischages, which are poor. Gage-height and precipitation satellite telemetry at station. AVERAGE DISCHARGE.--29 years (1960-89), 261 ft'/s (7.392 m'/s), 27.69 in/yr (703 mm/yr), 189,100 acre-ft/yr (233 he/yr); median of yearly mean discharges, 232 ft'/s (6.57 m 3 /s), 168,000 acre-ft/yr (207 hm 3/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 125,000 ft'is (3,540 m 3/s), Oct. 9, 1970, gage height, 24.0 ft (7.32 m), fro floodmark, from rating curve extended above 3,000 ft'is (85.0 m'/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 ft'/s (0.566 is,/s), 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 (15.2 ), September 1928, 36 ft (11.0 m), and September 1932, 34 ft (10.4 ) at site 1.6 mi (2.6 km) upstream. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 7,000 ft'is (198 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (10/s) (ft) (m) Date Time (W/s) (0/s) (ft) (m) Sept. 10 1945 9,990 283 unknown Sept. 18 1245 *26,500 750 unknown Minimum daily discharge, 38 Wis. (1.076 m'/s), July 13. 103 RIO GRANDE DE MANATI BASIN 104 50035000 RIO GRANDE DE MANATI AT CIALES, 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 JUL AUG SEP 1 288 258 105 82 58 71 256 61 260 47 66 117 2 163 183 97 73 56 67 197 57 302 51 64 81 3 138 147 94 71 55 65 138 53 139 56 63 83 4 132 128 92 70 54 63 113 53 307 51 78 69 5 119 126 90 69 53 58 90 55 215 48 109 74 6 106 118 89 67 53 55 76 60 112 58 76 113 7 107 114 89 65 52 60 113 64 82 80 53 95 8 127 112 88 69 57 63 79 71 73 78 67 122 9 163 112 87 95 67 63 74 65 65 58 64 383 10 582 109 92 87 60 62 68 70 59 49 62 e1720 11 257 106 93 84 57 58 67 57 58 47 123 e1180 12 146 106 91 113 58 57 67 99 58 88 116 e358 13 128 314 90 106 58 100 66 124 57 116 109 e200 14 118 270 86 87 59 89 65 76 57 246 78 e239 15 126 145 85 78 152 69 63 64 56 106 58 e231 16 114 136 83 75 279 74 62 59 55 76 54 e143 17 108 135 79 75 303 121 62 56 58 66 54 e279 18 104 172 77 75 210 91 60 55 81 65 101 e7110 19 101 134 76 74 120 78 60 53 83 65 164 e1720 20 99 117 74 73 83 73 60 53 61 66 90 e1140 21 99 112 73 71 76 75 58 53 55 64 83 e894 22 114 187 73 68 74 73 57 52 54 67 99 e675 23 113 275 73 65 69 72 61 52 70 74 213 e637 24 102 143 84 64 65 71 64 51 59 66 112 e1730 25 100 177 83 61 63 71 57 50 55 66 180 e564 26 100 275 75 66 87 67 53 67 53 65 85 e347 27 164 191 73 97 161 65 63 185 51 64 62 e368 28 105 145 71 70 89 65 64 83 50 67 141 e490 29 510 123 71 62 --- 69 62 68 49 65 109 e563 30 1470 110 95 60 90 61 68 47 60 140 e667 31 882 --- 104 59 135 --- 179 --- 60 128 --- TOTAL 6985 4780 2632 2331 2628 2290 2436 2213 2781 2235 3001 22392 MEAN 225 159 84.9 75.2 93.9 73.9 81.2 71.4 92.7 72.1 96.8 746 MAX 1470 314 105 113 303 135 256 185 307 246 213 7110 MIN 99 106 71 59 52 55 53 50 47 47 AC-FT 13850 9480 5220 4620 5210 4540 4830 4390 5520 4430 5950 444109 36 CFSM 1.76 1.24 .66 .59 .73 .58 .63 .56 .72 .56 .76 5.83 IN. 2.03 1.39 .76 .68 .76 .67 .71 .64 .81 .65 .87 6.51 CAL YR 1988 TOTAL 66780 MEAN 182 MAX 2770 MIN 36 AC-FT 132500 CFSM 1.43 IN. 19.41 WTR YR 1989 TOTAL 56704 MEAN 155 MAX 7110 MIN 47 AC-FT 112500 CFSM 1.21 IN. 16.48 e Estimated WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS 1979 TO CURRENT YEAR STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) OCT, 14 1134 113 228 21.0 APR, 03 1000 159 229 24.0 DEC, 09 1046 87 250 22.5 MAY, 02 1011 58 250 26.0 JAN, 04 0915 68 244 21.0 JUN, 09 1239 63 148 28.0 FEB, 07 1126 52 254 24.0 AUG, 02 1323 64 185 30.0 MAR, 15 1943 73 250 24.0 SEP, 05 1143 75 188 30.0 I I I I 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 ) upstream fro confluence with Rio Cialitos, 0.5 i (0.8 ks) north of Ciales plaza. DRAINAGE AREA.--136 i' (352 km') this excludes the 6 mi' (15.5 km') upstream from Lago El Guineo and Lago de Matrullas, flow from which is diverted to Rio Jacaguas. PERIOD OF RECORD.--Water years 1979 to current year. 015- OXYGEN, OXYGEN COLT- STREP- LHARGE, SPE- DIS- DEMAND, FORM. TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN. (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- D1S- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1988 19... 0930 101 250 7.80 26.0 4.5 8.7 106 <10 K160 30 DEC 15... 0820 70 255 7.20 23.0 6.4 7.8 90 <10 60 80 MAR 1989 01... 1000 84 247 7.30 23.5 12 7.3 84 <10 K620 K200 APR 17... 0925 49 265 7.40 25.0 2.5 8.2 97 <10 80 K140 JUN 16... 0925 46 263 8.40 28.0 3.4 8.1 102 12 60 20 AUG 23... 1140 256 233 7.60 25.5 15 6.8 82 10 2600 4200 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCAR8 CALCIUM SLUM, SODIUM, AD- SIUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLO SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1988 19... 99 1 24 9.5 12 0.5 1.9 98 3.8 11 12 DEC 15... 94 MAR 1989 01... 86 APR 17... 110 0 26 9.8 13 0.6 1.8 110 <0.5 9.5 14 JUN 16... 100 AUG 23... 96 0 23 9.4 13 0.6 2.1 84 10 14 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, 015- CONSTI- DIS- AT 105 GEM, GEN, GEN, GEN, GEM, 01S- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2tNO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 19... DEC 15... MAR 1989 01... APR 17... JUN 16... AUG 23... 0.1 28 157 43 9 0.39 0.01 0.40 0.01 0.29 14 0.39 0.01 0.40 0.03 0.47 10 0.59 0.01 0.60 0.04 0.26 0.1 27 164 22 2 <0.01 <0.10 0.02 0.38 <1 0.09 0.01 0.10 0.03 0.27 0.2 27 160 111 3 0.69 0.01 0.70 0.04 0.26 K = non-ideal count 106 RIO GRANOE DE MANATI BASIN 50035500 RIO GRANDE DE MANATI AT HIGHWAY 149 AT CIALES. PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA • NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE GATE (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 NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1988 19... 0.3 0.7 3.1 0.05 1 100 40 <1 1 10 DEC 15... 0.5 0.9 4.0 0.07 MAR 1989 01... 0.3 0.9 4.0 0.10 APR 17... 0.4 0.07 1 100 30 <1 2 <10 JUN 16... 0.3 0.4 1.8 0.07 AUG 23... 0.3 1.0 4.4 0.09 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- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS P8) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1988 19... 310 <5 40 <0.1 <1 1 <10 <0.01 3 0.01 DEC 15... MAR 1989 01... APR 17... 240 <5 40 <0.1 <1 <1 <10 <0.01 <1 0.02 JUN 16... AUG 23... I I I RIO GRANDE DE KARAT( BASIN 107 50035950 RIO CIALITOS AT HIGHWAY 649 AT CIALES, PR WATER-QUALITY RECORDS LOCATION.--Lat 18'20'18', long 66'28'28', 100 ft (30 ) upstream fro bridge on Highway 649. 0.1 si (1.1 km) upstream fro• south, and about 0.4 mi (0.6 km) west of Ciales plaza. DRAINAGE AREA.--17.0 it (44.0 kmz). PERIOD OF RECORD.--Water years 1969-71, 1974 to current year. 015- OXYGEN, OXYGEN COLI- STREP- CHARGE. SPE- 015- DEMAND. FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL. FECAL. 'CUBIC CON- PH TEMPER- TUR- OXYGEN. (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE 810- D1S- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1988 19... 1145 16 245 8.20 24.0 3.1 5.7 67 <10 K1900 2000 DEC 15... 1035 15 243 7.30 21.0 2.4 8.2 91 <10 K800 K1500 MAR 1989 01... 0900 14 232 7.40 21.0 3.9 7.8 86 12 K1100 590 APR 17... 1100 7.8 260 7.60 23.0 2.9 9.5 110 <10 3700 4200 JUN 16... 1105 8.4 257 8.30 25.5 1.6 7.7 92 <10 270 520 AUG 23... 0915 12 265 7.90 24.0 3.0 7.9 93 22 23000 21000 DATE OCT 1988 19... DEC 15... MAR 1989 01... APR 17... JUN 16... AUG 23... HARD- ALKA- HARD- NESS KAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCAR8 CALCIUM SIUM. SODIUM. AD- SIUM. WAT WH SULFATE RIDE. TOTAL WH WAT DIS- 01S- D1S- SORP- DIS- TOT FET SULFIDE DIS- 01S- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) 96 0 27 7.0 11 0.5 1.9 100 3.8 7.5 11 95 82 110 0 31 7.4 12 0.5 1.7 100 <0.5 7.1 11 110 -- 100 0 30 6.9 11 0.5 1.6 100 6.6 13 SOLIDS. RESIDUE FLUO- SILICA. SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE. DIS- CONSTI- DIS- AT 105 GEN, GEN. GEN, GEN. GEN, 01S- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2,NO3 AMMONIA ORGANIC SOLVED (MG/L 015- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) 5102) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 19... DEC 15... MAR 1989 01... APR 17... JUN 16... AUG 23... 0.1 30 155 6.8 4 0.69 0.01 0.70 0.01 0.19 6 0.69 0.01 0.70 0.01 0.19 7 1.29 0.01 1.30 0.10 0.80 0.1 29 164 3.5 7 0.29 0.01 0.30 0.02 0.28 115 0.29 0.01 0.30 0.03 0.37 0.1 31 160 5.2 12 0.49 0.01 0.50 0.03 0.27 K • non-ideal count 108 RIO GRANDE OE MANATI BASIN 50035950 RIO CIALITOS AT HIGHWAY 649 AT CIALES, PR--Continued WATER-QUALITY BATA. WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 NITRO- CHRO- GEN.AM- BARIUM, BORON. CADMIUM MIUM, COPPER, MONIA • NITRO- NITRO- P110S- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEM. GEN. PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (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 NO3) AS P) AS AS) AS BA) AS B) AS CO) AS CR) AS CU) OCT 1988 19... 0.2 0.9 4.0 0.06 1 <100 20 <1 1 <10 DEC 15... 0.2 0.9 4.0 0.01 MAR 1989 01... 0.9 2.2 9.7 0.09 APR 17... 0.3 0.6 2.7 0.11 <1 100 30 <1 <1 10 JUN 16... 0.4 0.1 3.1 0.08 AUG 23... 0.3 0.8 3.5 0.09 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- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS P8) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1988 19... 190 <5 10 <0.1 <1 1 <10 <0.01 <1 0.02 OEC 15... MAR 1989 01... APR 11... 380 8 40 <0.1 <1 <1 <10 <0.01 <1 0.03 JUN 16... AUG 23... I 109 RIO GRANDE DE MANATI BASIN 50038100 RIO GRANDE DE MANATI AT HIGHWAY 2 NEAR MANATI, PR 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' (98 km') is partly or entirely noncontributing, excludes 6.0 mi' (15.5 km') 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. Gage-height and precipitation satellite telemetry at station. AVERAGE DISCHARGE.--19 years (1971-89), 387 ft'/s (10.96 ai/s), 26.68 in/yr (678 mm/yr), 280,400 acre-ft/yr (346 his'/yr); median of yearly mean discharges, 361 ft3/s (10.2 m"/s), 262,000 acre-ft/yr (320 hm'/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 97,200 ft'/s (2,750 m'/s), Oct. 7, 1985, gage height, 33.79 ft (10.299 m) from rating curve extended above 15,000 ft'/s (425 m'/s) on basis of slope-area measurements of peak flow; minimum discharge, 33 ft'/s (0.935 m'/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 ft'is (255 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (e/s) (ft) (m) Date Time (W/s) (e/s) (ft) (n) Sept. 11 0145 16,900 479 29.18 8.894 Sept. 18 1715 *44,200 1,250 *31.82 9.699 Minimum discharge, 50 ft'/s (1.42 '/s), July 18-20, 22. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 581 551 184 142 100 176 244 88 473 67 65 264 2 322 367 174 128 100 140 319 82 468 75 74 132 3 247 282 165 122 99 125 216 78 260 154 64 111 4 225 240 159 118 98 117 185 283 85 66 79 89 5 210 216 154 115 99 111 150 80 395 75 94 70 6 187 204 150 115 98 112 123 84 193 73 117 99 7 172 204 148 113 97 118 136 95 136 139 79 107 8 166 189 149 119 100 114 116 105 111 119 64 93 9 384 181 147 143 114 106 100 97 97 113 80 356 10 693 173 148 152 110 102 95 95 87 91 69 1550 11 892 164 149 154 101 98 93 91 88 85 81 5260 12 385 162 141 177 98 100 93 87 82 125 301 586 13 316 327 137 177 97 136 91 182 78 135 162 298 14 282 694 135 153 102 155 89 131 75 371 131 226 15 303 277 133 133 130 120 85 90 72 134 93 328 16 267 239 135 126 508 115 83 75 78 84 79 155 17 250 256 130 130 407 151 82 72 101 64 76 339 18 237 279 130 124 369 148 81 68 79 54 13900 78 19 231 233 130 120 224 121 80 66 149 51 221 6550 20 226 210 126 123 161 116 78 67 91 60 147 2140 21 233 195 127 120 139 111 78 67 76 55 114 920 22 351 305 127 115 133 105 75 65 73 52 105 1350 23 421 530 132 110 125 103 81 64 106 86 243 523 24 264 276 137 107 115 101 126 64 86 89 162 2660 25 246 285 143 106 106 101 81 64 74 64 322 803 26 228 549 135 105 386 96 72 65 69 64 197 447 27 370 334 128 154 795 94 70 202 65 61 114 371 28 262 268 123 129 292 94 86 153 64 70 133 563 29 597 223 122 112 --- 95 89 112 66 67 137 812 30 1770 199 139 108 102 88 107 66 61 203 389 31 2760 --- 177 104 177 --- 130 --- 61 159 --- TOTAL 14078 8612 4414 3954 5303 3660 3385 2905 4141 2884 4030 41491 MEAN 454 287 142 128 189 118 113 93.7 138 93.0 130 1383 MAX 2760 184 795 319 473 322 694 177 177 202 371 13900 MIN 166 162 122 104 97 94 70 64 64 51 64 70 AC-FT 27920 17080 8760 7840 10520 7260 6710 5760 8210 5720 7990 82300 CFSM 2.31 1.46 .72 .65 .96 .60 .57 .48 .70 .47 .66 7.02 IN. 2.66 1.63 .83 .75 1.00 .69 .64 .55 .78 .54 .76 7.83 CAL YR 1988 TOTAL 116769 MEAN 319 MAX 5570 MIN 92 AC-FT 231600 CFSM 1.62 IN. 22.05 WTR YR 1989 TOTAL 98857 MEAN 271 MAX 13900 MIN 51 AC-FT 196100 CFSM 1.37 IN. 18.67 11.0 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 RECORDS PERIOD OF RECORD.--Water years 1969 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1988 03... 0930 246 247 7.40 24.5 40 6.9 82 <10 K12000 75000 DEC 5... 0945 153 320 7.60 25.0 8.3 7.5 90 43 4700 2500 FEB 1989 6... 0940 98 337 7.70 24.0 1.9 7.4 86 <10 20000 K14000 APR 03... 1145 203 263 7.60 23.0 25 7.6 88 11 K2000 810 JUN 01... 0945 456 244 7.20 23.0 33 6.3 73 49 4500 3000 AUG 08... 1045 64 310 7.80 25.0 2.0 8.3 100 14 240 360 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- FLUO- NESS NONCARB CALCIUM SIUM, SODIUM, AD- SIUM, WAT WH SULFATE RIDE, RIDE, TOTAL WH WAT D1S- DIS- DIS- SORP- DIS- TOT FET DIS- DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD SOLVED SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS SO4) AS CL) AS F) OCT 1988 03... 110 10 32 6.8 9.4 0.4 2.0 97 14 10 0.1 DEC 5... 140 0 43 7.9 11 0.4 1.8 140 10 12 0.1 FEB 1989 6... 150 7 46 8.3 12 0.4 1.5 140 9.5 13 0.1 APR 03... 110 6 32 6.4 9.9 0.4 3.0 100 15 12 0.1 JUN 01... 100 8 29 7.1 12 0.5 2.0 90 9.0 13 0.1 AUG 08... 140 0 41 8.2 12 0.4 1.3 130 8.0 12 0.2 SOLIDS, SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- SILICA, RESIDUE SUM OF SOLIDS, TOTAL GEN, GEN, GEN, GEN,AM- PHOS- DIS- AT 180 CONSTI- DIS- AT 105 NO2+NO3 AMMONIA AMMONIA MONIA + PHOS- PHOROUS SOLVED DEG. C TUENTS, SOLVED DEG. C, DIS- DIS- DIS- ORGANIC PHOROUS DIS- (MG/L DIS- 01S- (TONS SUS- SOLVED SOLVED SOLVED TOTAL TOTAL SOLVED DATE AS SOLVED SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L SI02) (MG/L) (MG/L) DAY) (MG/L) AS N) AS N) AS NH4) AS N) AS P) AS P) OCT 1988 03... 21 150 159 106 0.86 0.04 0.05 0.9 0.09 0.08 DEC 05... 20 195 195 81 9 0.96 0.08 0.1 0.3 0.10 0.09 FEB 1989 06... 18 201 196 52 7 0.37 0.05 0.06 <0.2 0.08 0.06 APR 03... 18 157 162 89 <1 1.20 0.15 0.19 0.5 0.20 0.18 JUN 01... 22 143 157 193 46 1.20 0.06 0.08 0.4 0.17 0.15 AUG 08... 19 185 183 32 15 0.19 0.01 0.02 0.3 0.05 0.05 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 1988 TO SEPTEMBER 1989 PHOS- PHOS- PHOROUS PHATE, ALUM- BERYL- CHRO- ORTHO, ORTHO, INUM, ARSENIC BARIUM, LIUM, CADMIUM MIUM, COBALT, COPPER, IRON, DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED DATE (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS P) AS PO4) AS AL) AS AS) AS BA) AS BE) AS CD) AS CR) AS CO) AS CU) AS FE) OCT 1988 03... 0.10 0.31 60 1 50 <0.5 <1 <1 <3 8 73 DEC 5... 0.07 0.21 FEB 1989 6... 0.05 0.15 50 <1 61 <0.5 2 1 <3 4 73 APR 03... 0.13 0.40 JUN 01... 0.14 0.43 50 1 41 <0.5 1 <1 <3 3 53 AUG 08... 0.04 0.12 MANGA- MOLYB- SELE- STRON- VANA- LEAD, LITHIUM NESE, MERCURY DENIM, NICKEL, NIUM, SILVER, TIUM, DIUM, DIS- DIS- DIS- DIS- DIS- 01S- DIS- DIS- DIS- DIS- SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS PB) AS LI) AS MN) AS HG) AS MO) AS NI) AS SE) AS AG) AS SR) AS V) OCT 1988 03... <5 <4 22 <0.10 <10 1 <1 <1.0 160 <6 DEC 5... FEB 1989 6... <5 <4 38 0.20 <10 <1 <1 <1.0 210 <6 APR 03... JUN 01... 10 <4 22 <10 1 <1 <1.0 150 8 AUG 08... PESTICIDE ANALYSES CHLOR- DI- DI- ENDO- PCB, ALDRIN, DANE, DOD, DOE, DOT, AZINON, ELDRIN SULFAN, DATE 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) JUN 01... 0945 <0.1 <0.01 <0.1 <0.01 <0.01 <0.01 0.01 <0.01 <0.01 HEPTA- METH- METHYL METHYL HEPTA- CHLOR MALA- OXY- PARA- TRI- ENDRIN, ETHION, CHLOR, EPDXIDE LINDANE THION, CHLOR, THION, THION, MIREX, DATE 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) JUN 01... <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 NAPH- THA- LENES, PARA- POLY- PER- TOX- TOTAL THION, CHLOR. THANE APHENE, TRI- 2,4-0, 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) JUN 01... <0.01 <0.1 <0.1 <1 <0.01 0.03 <0.01 <0.01 <0.01 111 112 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 1988 TO SEPTEMBER 1989 PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT SED. SEDI- SUSP. MENT, SIEVE STREAM- SEDI- DIS- DIAM. FLOW, MENT, CHARGE, PERCENT INSTAN- SUS- SUS- FINER DATE TIME TANEOUS PENDED PENDED THAN (CFS) (MG/L) (T/OAY) .062 MM OCT 1988 03... 0930 246 73 48 87 DEC 1989 5... 0945 153 20 8 67 FEB 6... 0940 98 53 14 74 APR 03... 1145 203 72 40 81 JUN 01... 0945 456 AUG 08... 1045 64 323 56 69 LAGUNA TORTUGUERO BASIN 113 50038200 LAGUNA TORTUGUERO 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 (6.8 km) northeast of Manati, and 4.4 mi (7.1 km) northwest of Vega Baja plaza. DRAINAGE AREA.--Indeterminate. PERIOD OF RECORD.--Water years 1964-66, 1969-71, 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1988 11... 0940 35 1070 7.80 26.5 6.6 80 23 29 70 DEC 19... 0920 25 1100 7.80 26.5 7.8 95 26 K4 22 FEB 1989 13... 0920 7.7 1150 8.10 25.0 7.4 88 22 K15 290 APR 19... 1245 11 1210 8.30 26.5 8.0 99 34 22 K17 JUN 12... 1030 8.3 1470 8.00 26.0 7.1 86 28 K170 36 AUG 14... 0930 3.8 1380 7.90 29.0 6.6 84 21 K1400 900 ALKA- RESIDUE NITRO- LINITY TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- GEN,AM- WAT WH AT 105 GEN, GEN, GEN, GEN, GEN, MONIA + NITRO- TOT FET SULFIDE DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, FIELD TOTAL SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL DATE MG/L AS (MG/L PENDED (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L CAC03 AS S) (MG/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) OCT 1988 11... 120 <0.5 0.58 0.02 0.60 0.24 0.86 1.1 1.7 DEC 19... 140 6 0.98 0.02 1.00 0.23 0.97 1.2 2.2 FEB 1989 13... 130 10 0.68 0.02 0.70 0.11 0.89 1.0 1.7 APR 19... 110 <0.5 <1 0.38 0.02 0.40 0.11 0.79 0.9 1.3 JUN 12... 100 13 0.39 0.01 0.40 0.10 0.8 0.9 1.3 AUG 14... 110 <0.01 0.60 0.18 1.4 1.6 2.2 MANGA- METHY- BORON, COPPER, IRON, NESE, ZINC, LENE NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL BLUE GEN, PHOROUS RECOV- RECOV- RECOV- RECOV- RECOV- CYANIDE ACTIVE TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE TOTAL PHENOLS SUB- DATE (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS NO3) AS P) AS B) AS CU) AS FE) AS MN) AS ZN) AS CN) (UG/L) (MG/L) OCT 1988 11... 7.5 0.01 70 10 40 <10 <10 <0.01 <1 0.05 DEC 19... 9.7 0.01 FEB 1989 13... 7.5 0.01 APR 19... 5.8 0.01 110 20 60 <10 <10 <0.01 <1 0.3 JUN 12... 5.8 0.02 AUG 14... 9.7 0.01 K non-ideal count 114 THIS PAGE WAS LEFT BLANK INTENTIONALLY  115 ATLANTIC OCEAN MANATI a Logan° Tor fuguero 0395 VEGA BAJA .211 *44 • 70 .212 VEGA ALTA . DORADO • TOA BAJA a .213 Drainage boundaries indeterminate in limestone terrane TOA ALTA a rn — Ltmestone Igneous and sedimentary rocks UCIALES MOROVIS ItiO Gran& 41. Monotrbasin NARANJITO a Drainage boundary Rin de to Plato baton EXPLANATION A 038320 SURFACE—WATER STATION AND NUMBER 0382 QUALITY—OF—WATER STATION AND NUMBER • 213 WELL AND WELL NUMBER p area 4 5 KILOMETERS i 3 4 5141155 Figure 16. 7 -Rio Cibuco basin. I I I I 116 RIO CIBUCO BASIN 50038320 RIO CIBUCO BELOW COROZAL, PR LOCATION.--Lat 18'21'13". long 66°20'07", Hydrologic Unit 21010001, on right bank, 150 ft (46 ) downstream fro Rio Corozal, and 1.4 mi (2.3 km) northwest of Corozal. DRAINAGE AREA.--15.1 iZ (39.1 km 2 ). 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.--20 years (1970-89), 29.7 ft'is (0.841 e/s), 26.71 in/yr (678 mm/yr), 21,520 acre-ft/yr (26.5 hm 3/yr); median of yearly mean discharges, 33 ft'/s (0.93 m'/s), 23,900 acre-ft/yr (29 hm 3/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 13,600 ft'/s (385 m'/s), Nov. 7, 1979, gage height, 19.80 ft (6.035 fro rating curve extended above 100 ft3 /s (2.83 m 3/s) on basis of float and slope-area measurements of peak flow; minimum daily discharge, 1.3 ft'is (0.037 e/s). July 24-26, 1977. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 2,500 ft'is (70.8 e/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (m 3/s) (ft) (m) Date Time (ft 3/s) (m 3/s) (ft) (m) Sept. 18 1215 *3.260 92.3 *11.82 3.603 No other peak greater than base discharge. Minimum discharge, 3.5 ft3/s (0.10 e/s), June 30, July 1 DISCHARGE. CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 18 26 13 11 7.4 9.6 68 8.1 46 6.9 9.7 16 2 19 20 13 10 7.6 8.3 66 9.0 33 5.1 5.7 21 3 16 17 12 9.4 7.4 7.5 91 7.5 31 4.7 12 21 4 16 15 13 9.0 7.6 7.4 54 6.8 27 4.3 11 15 5 15 15 13 8.7 6.9 6.8 32 10 15 4.5 9.3 15 6 13 17 12 8.5 7.2 9.0 28 9.5 9.7 41 6.0 15 7 13 16 13 11 6.7 9.1 16 8.8 7.5 22 4.9 69 8 12 19 13 13 9.1 7.0 11 8.6 7.2 9.9 4.4 52 9 14 13 13 16 9.0 7.0 10 7.3 6.6 6.7 4.1 32 10 13 11 14 15 8.5 6.8 10 7.2 6.5 6.2 4.2 54 11 12 11 12 25 7.5 6.5 11 6.9 9.1 8.3 14 48 12 12 10 11 22 6.7 7.6 10 20 6.5 6.1 51 22 13 11 21 11 16 8.5 12 9.3 19 6.5 5.2 14 18 14 18 14 11 12 8.8 7.7 8.5 11 6.5 14 8.8 23 15 16 13 12 10 32 9.6 8.2 8.7 6.1 11 7.2 23 16 13 39 12 10 41 18 7.8 7.5 11 5.6 6.9 44 17 11 54 12 11 71 13 8.0 6.8 6.9 6.0 13 95 18 11 25 12 10 28 16 7.7 6.2 6.0 5.4 18 781 19 9.9 18 11 10 15 8.8 7.8 6.0 5.9 4.8 16 85 20 9.9 16 11 14 12 7.9 7.8 7.3 5.4 4.8 10 202 21 11 16 12 9.9 11 7.8 7.5 6.7 5.4 4.5 12 72 22 69 73 14 8.9 11 7.3 6.9 6.0 4.9 15 9.2 37 23 25 40 12 8.7 9.7 7.2 6.5 5.5 5.7 11 18 96 24 18 21 13 8.3 8.8 9.8 7.0 5.5 4.8 7.4 13 110 25 17 20 14 8.2 13 9.0 6.6 5.3 4.3 6.4 8.9 40 26 15 25 13 7.8 69 8.0 6.5 9.8 4.3 5.4 7.4 31 27 16 24 11 8.4 35 7.1 6.8 12 4.5 6.0 6.6 24 28 18 17 12 8.0 13 14 6.4 7.4 5.2 6.4 6.5 22 29 83 15 12 7.9 --- 7.6 9.4 6.7 4.6 4.9 29 20 30 110 14 23 7.8 123 9.0 8.7 4.0 4.6 16 21 31 53 --- 14 7.5 135 --- 59 --- 5.2 10 --- TOTAL 707.8 655 394 343.0 478.4 521.4 544.7 314.8 307.1 259.3 366.8 2124 MEAN 22.8 21.8 12.7 11.1 17.1 16.8 18.2 10.2 10.2 8.36 11.8 70.8 MAX 110 73 23 25 71 135 91 59 46 41 51 781 MIN 9.9 10 11 7.5 6.7 6.5 6.4 5.3 4.0 4.3 4.1 15 AC-FT 1400 1300 781 680 949 1030 1080 624 609 514 728 4210 CFSM 1.51 1.45 .84 .73 1.13 1.11 1.20 .67 .68 .55 .78 4.69 IN. 1.74 1.61 .97 .85 1.18 1.28 1.34 .78 .76 .64 .90 5.23 CAL YR 1988 TOTAL 11344.5 MEAN 31.0 MAX 1220 MIN 6.6 AC-FT 22500 CFSM 2.05 IN. 27.95 WTR YR 1989 TOTAL 7016.3 MEAN 19.2 MAX 781 MIN 4.0 AC-FT 13920 CFSM 1.27 IN. 17.29 117 RIO CIBUCO BASIN 50038320 RIO CIBUCO BELOW COROZAL, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORD.--Water years 1969-76, 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 DIS- OXYGEN, OXYGEN COLT- STREP­ CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1988 07... 1040 13 392 7.90 24.5 1.4 7.6 90 21 970 870 DEC 12... 1015 12 366 7.80 22.0 5.4 8.0 91 <10 600 660 FEB 1989 17... 0905 96 234 7.70 20.5 97 8.5 94 20 K11000 37000 APR 07... 1005 14 368 7.80 22.5 4.5 7.8 89 16 3800 290 JUN 16... 1015 6.2 428 7.70 24.0 4.8 6.2 73 28 23000 4400 AUG 15... 1130 7.6 399 7.60 27.5 3.8 5.8 73 37 2000 950 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SIUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1988 07... 130 14 34 12 16 0.6 3.1 140 <0.5 18 22 DEC 12... 140 FEB 1989 17... 80 APR 07... 130 10 33 12 18 0.7 3.5 130 <0.5 18 21 JUN 16... 150 AUG 15... 140 6 39 11 20 0.7 3.6 140 19 23 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 07... 0.1 31 210 7.4 4 0.97 0.33 1.30 0.80 0.70 DEC 12... 16 1.14 0.26 1.40 0.74 0.66 FEB 1989 17... -- 112 1.14 0.06 1.20 0.15 1.30 APR 07... 0.1 30 209 7.6 11 1.04 0.16 1.20 0.86 0.24 JUN 16... 11 0.70 0.20 0.90 1.70 0.50 AUG 15... 0.1 30 224 4.6 16 0.76 0.14 0.90 0.81 1.10 K = non-ideal count 118 RIO CIBUCO BASIN 50038320 RIO CIBUCO BELOW COROZAL, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA * NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (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 NO3) AS P) AS AS) AS BA) AS B) AS CO) AS CR) AS CU) OCT 1988 07... 1.5 2.8 12 0.76 <1 <100 30 <1 6 <10 DEC 12... 1.4 2.8 12 0.31 FEB 1989 17... 1.5 2.7 12 0.37 APR 07... 1.1 2.3 10 0.25 1 100 20 <1 2 <10 JUN 16... 2.2 3.1 14 0.68 AUG 15... 1.9 2.8 12 0.44 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- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1988 <1 2 0.06 07... 300 <5 50 <0.1 <1 50 <0.01 DEC 12... FEB 1989 17... APR 07... 1500 70 0.1 2 20 <5 <1 <0.01 <1 0.07 JUN 16... AUG 15... 119 RIO CIBUCO BASIN 50039500 RIO CIBUCO 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' (256.7 km 2 ), of which 25.4 mi' (65.8 km 2 ), does not contribute directly to surface runoff. WATER-DISCHARGE RECORDS PERIOD OF RECORD.--January 1973 to current year. GAGE.--Water-stage recorder. Elevation of gage is 7.79 ft (2.37 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.--16 years (1974-89). 132 ft'/s (3.738 m'/s), 18.09 in/yr (459 mm/yr), 95,630 acre-ft/yr (118 he/yr); median of yearly mean discharges, 130 ftl/s (3.68 80/s), 94,200 acre-ft/yr (116 he/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 the basis of indirect measurements; minimum discharge, 6.1 ft'is (0.173 140/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'is (793 m'/s). EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 3,200 ft'is (90.6 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (W/s) (e/s) (ft) (m) Date Time (W/s) (e/s) (ft) (m) Sept. 18 2315 *6,050 171 16.36 4.986 No other peak greater than base discharge. Minimum discharge, 12 ft'is (0.340 80/s), July 20, 21. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 103 123 64 60 42 138 469 37 233 32 43 53 2 94 85 60 52 39 90 244 46 220 45 28 143 3 88 78 58 48 37 73 347 46 131 37 33 167 4 97 70 58 45 37 64 214 35 98 36 68 77 5 100 78 56 44 37 58 127 40 96 37 26 61 6 70 115 58 43 40 61 93 56 53 38 31 75 7 64 75 64 46 35 93 70 47 42 155 19 54 8 60 65 62 90 41 51 60 39 38 37 16 240 9 70 76 54 93 50 43 55 35 38 22 14 297 10 148 53 58 113 47 53 53 32 38 17 16 148 11 106 59 58 224 40 56 57 32 69 16 16 596 12 65 47 50 211 35 56 49 39 46 18 202 151 13 61 183 47 166 36 108 48 90 37 15 157 179 14 95 247 47 94 37 66 44 85 34 14 26 176 15 116 89 47 78 101 63 41 38 34 35 15 193 16 78 98 52 71 274 58 40 32 41 17 19 115 17 63 276 47 70 571 116 38 30 137 14 25 497 18 62 200 47 63 310 81 39 27 47 15 29 1970 19 58 132 44 60 136 61 36 26 39 14 51 e1900 20 54 103 44 96 83 49 39 25 34 13 26 458 21 53 91 46 84 66 49 51 33 33 13 27 549 22 157 264 49 55 73 48 35 34 34 15 23 275 23 230 413 65 48 75 47 33 33 33 51 33 233 24 77 135 100 47 67 57 48 33 35 30 56 708 25 67 88 90 45 66 58 35 36 33 38 27 306 26 57 171 85 46 533 49 34 38 34 54 21 222 27 52 132 68 50 963 45 34 74 32 23 23 203 28 57 91 53 46 255 49 32 42 31 26 20 167 29 160 73 75 47 --- 67 40 36 32 18 49 190 30 336 66 112 47 120 62 39 31 15 124 138 31 331 --- 87 42 306 --- 86 --- 22 48 --- TOTAL 3229 3776 1905 2324 4126 2333 2567 1321 1833 932 1311 10541 MEAN 104 126 61.5 75.0 147 75.3 85.6 42.6 61.1 30.1 42.3 351 MAX 336 413 112 224 963 306 469 90 233 155 202 1970 MIN 52 47 44 42 35 43 32 25 31 13 14 53 AC-FT 6400 7490 3780 4610 8180 4630 5090 2620 3640 1850 2600 20910 CFSM 1.05 1.27 .62 .76 1.49 .76 .86 .43 .62 .30 .43 3.55 IN. 1.21 1.42 .72 .87 1.55 .88 .96 .50 .69 .35 .49 3.96 CAL YR 1988 TOTAL 58163 MEAN 159 MAX 5120 MIN 28 AC-FT 115400 CFSM 1.60 IN. 21.83 WTR YR 1989 TOTAL 36198 MEAN 99.2 MAX 1970 MIN 13 AC-FT 71800 CFSM 1.00 IN. 13.59 e Estimated 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 1988 TO SEPTEMBER 1989 DATE OCT 1988 TIME DIS- CHARGE, INST. CUBIC FEET PER SECOND SPE- CIFIC CON- DUCT- ANCE (US/CM) PH (STAND- ARD UNITS) TEMPER- ATURE WATER (DEG C) TUR- BID- ITY (NTU) OXYGEN, DIS- SOLVED (MG/L) OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) COLI- FORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) 11... 1330 89 404 7.60 24.5 25 6.1 72 33 K8300 8900 DEC 09... 1235 52 427 7.60 23.5 4.5 5.0 58 <10 2000 K730 FEB 1989 13... 1215 38 444 7.80 24.5 1.3 3.8 45 12 K340 K280 APR 14... 0920 48 464 7.80 24.0 1.8 4.0 47 <10 3500 240 JUN 12... 1430 43 440 7.70 25.0 7.0 5.4 64 <10 K840 370 AUG 14... 1430 20 390 7.80 27.5 9.8 6.3 79 22 550 330 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SIUM, SODIUM, AD- SIUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1988 11... 170 6 54 7.9 14 0.5 3.8 160 <0.5 16 17 DEC 09... 180 FEB 1989 13... 190 APR 14... 200 15 64 9.6 18 0.6 3.2 180 <0.5 14 22 JUN 12... 160 AUG 14... 170 55 7.2 13 0.4 4.0 140 13 16 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2,-NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENOED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 11... 0.1 16 226 54 38 1.15 0.05 1.20 0.11 0.39 DEC 09... 5 1.52 0.08 1.60 0.14 0.66 FEB 1989 13... 5 1.34 0.06 1.40 0.10 0.20 APR 14... 0.1 19 261 34 3 1.29 0.11 1.40 0.21 0.39 JUN 12... <-1 1.16 0.04 1.20 0.07 0.53 AUG 14... 0.1 15 281 15 12 1.08 0.02 1.10 0.04 0.36 K = non-ideal count RIO CIBUCO BASIN 50039500 RIO CIBUCO AT VEGA BAJA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (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 NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1988 11... 0.5 1.7 7.5 0.22 1 <100 <10 1 3 50 DEC 09... 0.8 2.4 11 0.24 FEB 1989 13... 0.3 1.7 7.5 0.31 APR 14... 0.6 2.0 8.9 0.30 1 100 60 3 2 <10 JUN 12... 0.6 1.8 8.0 0.28 AUG 14... 0.4 1.5 6.6 0.23 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- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1988 11... 1900 <5 90 <0.1 <1 1 20 <0.01 1 0.03 DEC 09... FEB 1989 13... APR 14... 200 <5 50 <0.1 <1 <1 <10 <0.01 8 0.11 JUN 12... AUG 14... 121 122 THIS PAGE WAS LEFT BLANK INTENTIONALLY 123 A A NT C 0 CEA AN JUAN DORADO TOARAJA- CATAMO Dro?rioge boundaries indeterminate in limestone terrone 0469 0460 TC A ALTA Limestone COROZ AL o 04'0 044950 i4JA .CA04.5 ! ARANJIT Rio C ibu Drainage boundary 438 ti(c) de floyornoil eosin Rio Grand• de Mandl( basin CO ERI Island divide ARRANQUITAS La Ptot Rio Grande Islond divide EXPLANAlloff CAYEY II 039990 LAKE-ELEVATION STATION A0469 SURFACE-WATER STATION AND NUMBER v0430 QUALITY-OF-WATER STATION AND NUMBER Rio Sat!. 70399 QUALITY-OF-WATER PARTIAL RECORD 4 5 KILOMETERS n Pet beein .216 STATION AND NUMBER WELL AND WELL NUMBER 2 3 1 4 1 5 MILES Tunri to Rio G... Figure 17.--Rio de la Plata basin. I I I I I I I 124 RIO DE LA PLATA BASIN 50039990 LAGO CARITE AT GATE TOWER 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 i (1.1 km) northwest fro Escuela Carite Chino, 1.2 i (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 i' (21.2 km 2 ). ELEVATION RECORDS PERIOD OF RECORD.--May to September 1989. 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 (31.7 ) and a lenght of 500 ft (152 m). The dam has a capacity of approximately 11,310 acre-feet (13.9 hm 3 ). The Dam is operated by the Puerto Rico Electric and Power Authority. Gage-height and precipitation satellite telemetry at station. EXTREMES OBSERVED FOR CURRENT PERIOD.--Maximum elevation 1,779.92 ft (542.520 m), May 7; minimum elevation, 1,774.02 ft (540.721 ), Aug. 18. Capacity Table (based on Data fro Puerto Rico Electric Power Authority) Elevation, in feet Contents, in acre-feet Elevation, in feet Contents.in acre-feet 1,746 0 1,775 6,194 1,760 2,471 1,780 7,704 1.769 4,561 1,784 8,996 ELEVATION (FEET NGVD), WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 OBSERVATION AT 24:00 VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 1778.51 A 1774.95 1774.81 2 1778.50 A 1774.85 1774.77 3 1778.50 A 1774.84 1774.67 4 1778.45 A 1774.78 1774.62 5 1778.39 A 1774.72 1774.54 6 1779.83 1778.31 A 1774.65 1774.53 7 1779.88 1778.23 A 1774.56 1774.45 8 1779.84 1778.15 A 1774.50 1774.35 9 1779.78 1778.07 A 1774.41 1774.31 10 1779.70 1777.97 A 1774.35 1774.48 11 1779.61 1777.91 A 1774.36 1774.66 12 1779.51 1777.84 A 1774.34 1774.96 13 1779.44 1777.75 A 1774.27 1774.92 14 1779.36 1777.68 A 1774.21 1774.90 15 1779.26 1777.60 A 1774.17 1775.01 16 1779.19 1777.46 A 1774.11 1775.03 17 1779.09 A A 1774.08 1775.06 18 1779.01 A A 1774.10 A 19 1778.93 A A 1774.41 A 20 1778.85 A 1775.30 1774.50 A 21 1778.72 A 1775.24 1774.47 A 22 1778.64 A 1775.20 1774.39 A 23 1778.55 A 1775.27 1774.43 A 24 1778.45 A 1775.22 1774.50 A 25 1778.37 A 1775.18 1774.47 A 26 1778.32 A 1775.29 1774.41 A 27 1778.32 A 1775.26 1774.55 A 28 1778.49 A 1775.23 1774.49 A 29 1778.42 A 1775.17 1774.85 A 30 1778.44 A 1775.07 1774.91 A 31 1778.48 1775.00 1774.88 --- MEAN 1774.50 MAX 1774.95 MIN 1774.08 A No gage-height record. I 125 RIO DE LA PLATA BASIN 50043000 RIO DE LA PLATA AT PROYECTO LA PLATA, PR LOCATION.--Lat 18'09'37", 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 i 2 (163.2 km9, excludes 8.2 mi' (21.1 ka') 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 ft'/s (0.65 mi/s) into Cidra Reservoir. Gage-height and precipitation satellite telemetry at station. AVERAGE DISCHARGE.--29 years (1961-89), 109 ft3/s (3.087 m'/s), 27.01 in/yr (686 mm/yr), 78,970 acre-ft/yr (97.3 h20/yr); median of yearly mean discharges, 88 ft'/s (2.49 m'/s), 63,800 acre-ft/yr (79 hm'/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 59,600 ft'is (1,690 DP's), Aug. 27, 1961, gage height, 32.21 ft (9.818 m), from rating curve extended above 7,000 ft'is (198 m'/s) on basis of slope-area measurement; minimum daily discharge, 2.6 ft'is (0.074 m 3/s), July 25, 1974. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 4,000 ft'is ( 113 mi/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (W/s) (m3/s) (ft) (m) Date Time (ftqs) (m 3/s) (ft) (m) Feb. 17 0945 5,400 153 10.90 3.322 No other peak greater than base discharge. Minimum daily discharge, 4.4 ft'/s (0.12 gigs), July 23, Aug. 8. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 75 49 41 59 19 30 47 20 27 5.1 5.6 15 2 94 274 39 44 19 27 44 15 20 5.5 5.8 9.9 3 242 194 39 36 18 25 40 13 48 9.1 6.2 7.0 4 311 94 38 29 e19 28 31 19 65 9.0 43 7.8 5 194 63 36 26 e19 38 25 14 19 5.6 31 5.6 6 99 51 35 25 e18 36 23 15 12 13 8.0 5.5 7 109 42 33 26 e18 62 21 52 10 12 5.0 8.7 8 67 57 36 33 e22 54 20 37 8.6 18 4.4 8.7 9 56 92 33 24 e23 97 26 18 7.7 11 4.5 13 10 39 54 33 24 e19 145 31 16 7.2 6.9 5.0 180 11 37 49 32 38 e16 138 55 13 9.5 6.7 50 222 12 39 60 29 58 e15 63 27 12 12 8.5 23 115 13 91 60 28 60 e14 78 47 13 9.5 e5.5 24 40 14 41 94 30 36 e17 66 30 12 6.9 e6.5 10 19 15 32 61 26 31 50 150 23 12 6.4 7.4 7.0 47 16 40 126 27 28 186 47 21 10 6.0 9.1 5.3 40 17 40 687 33 28 3150 39 23 9.0 7.2 5.7 5.8 127 18 53 482 48 47 828 39 21 8.0 9.1 6.2 92 610 19 42 265 27 44 280 32 e19 8.1 8.6 5.9 193 380 20 71 169 33 36 154 30 e18 8.2 7.4 5.4 56 86 21 278 121 35 212 122 25 e17 8.4 7.3 5.0 23 94 22 156 99 33 70 120 27 ell 8.7 7.7 4.6 13 303 23 94 86 34 33 63 97 ell 8.6 7.8 4.4 8.0 573 24 142 68 38 27 51 48 18 7.7 6.6 11 43 545 25 68 130 59 24 46 29 21 7.5 6.1 5.3 25 238 26 48 170 46 23 54 29 18 8.2 5.4 8.2 10 99 27 40 171 26 23 53 29 19 9.7 5.3 9.0 30 60 28 32 80 25 20 35 26 18 36 4.7 7.3 31 38 29 80 61 125 22 --- 33 20 24 4.9 7.5 12 32 30 162 45 239 25 58 26 13 5.1 5.3 72 26 31 155 --- 94 20 62 --- 23 --- 6.7 29 --- TOTAL 3027 4054 1430 1231 5448 1687 783 479.1 368.0 236.4 880.6 3955.2 MEAN 97.6 135 46.1 39.7 195 54.4 26.1 15.5 12.3 7.63 28.4 132 MAX 311 687 239 212 3150 150 55 52 65 18 193 610 MIN 32 42 25 20 14 25 17 7.5 4.7 4.4 4.4 5.5 AC-FT 6000 8040 2840 2440 10810 3350 1550 950 730 469 1750 7850 CFSM 1.78 2.47 .84 .72 3.55 .99 .48 .28 .22 .14 .52 2.41 IN. 2.05 2.75 .97 .84 3.70 1.15 .53 .33 .25 .16 .60 2.68 CAL YR 1988 TOTAL 33670.2 MEAN 92.0 MAX 1030 MIN 5.0 AC-FT 66780 CFSM 1.68 IN. 22.86 WTR YR 1989 TOTAL 23579.3 MEAN 64.6 MAX 3150 MIN 4.4 AC-FT 46770 CFSM 1.18 IN. 16.01 e Estimated -- 126 RIO DE LA PLATA BASIN 50043000 RIO DE LA PLATA AT PROYECTO LA PLATA, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORD.--Water years 1958 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 DIS- OXYGEN, OXYGEN COLI- STREP­ CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1988 13... 0955 104 362 8.10 24.0 7.2 8.2 99 25 K12000 2100 DEC 07... 1110 34 408 8.30 24.0 1.2 9.4 114 13 470 K150 FEB 1989 14... 0950 17 430 8.40 26.0 3.3 10.7 133 13 27 300 APR 05... 1000 26 381 8.10 23.5 2.0 10.6 126 11 K82 230 JUN 14... 1100 8.3 576 8.50 27.0 3.0 9.3 118 22 500 500 AUG 24... 1245 54 357 8.00 28.0 2.6 7.2 94 23 2400 K910 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SLUM, SODIUM, AD- SIUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1988 13... 120 0 7 12 25 1 2.0 120 0.6 17 24 DEC 07... 150 FEB 1989 14... 170 APR 05... 130 0 13 12 26 1 2.3 130 <0.5 16 22 JUN 14... 150 AUG 24... 120 4 29 11 21 0.9 2.7 100 18 20 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 13... 0.1 24 207 58 9 1.18 0.12 1.30 0.26 0.54 DEC 07... 1 1.55 0.05 1.60 0.03 0.67 FEB 1989 14... 4 1.94 0.06 2.00 0.06 0.74 APR 05... 0.2 22 213 15 4 1.64 0.06 1.70 0.21 0.29 JUN 14... 7 2.36 0.14 2.50 0.04 0.56 AUG 24... 0.1 20 190 28 9 1.24 0.06 1.30 0.03 0.57 K = 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 1988 TO SEPTEMBER 1989 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (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 NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1988 13... 0.8 2.1 9.3 0.35 <1 <100 30 1 <1 <10 DEC 07... 0.7 2.3 10 0.34 FEB 1989 14... 0.8 2.8 12 0.59 APR 05... 0.5 2.2 9.7 0.39 <1 <100 30 1 2 <10 JUN 14... 0.6 3.1 14 0.87 AUG 24... 0.6 1.9 8.4 0.29 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- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1988 13... 600 <5 30 <0.1 <1 <1 <10 <0.01 2 0.08 DEC 07... FEB 1989 14... APR 05... 540 <5 20 <0.1 <1 1 10 <0.01 2 0.09 JUN 14... AUG 24... 127 I 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 (15.2 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 2 (282 km2). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--December 1988 to September 1989. GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 604.2 ft (184.2 m) above mean sea level. REMARKS.--Records fair except for 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 4,000 ft'/s (113 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (W/s) (20/s) (ft) (m) Date Time (ft'/s) (m'/s) (ft) (m) Feb. 17 1815 6,640 188 9.57 2.917 Sept. 23 0445 5,640 160 9.03 2.752 Sept. 10 1915 9,760 276 11.00 3.353 Sept. 24 0200 7,390 209 9.94 3.030 Sept. 18 1030 *32,000 906 *17.36 5.291 Minimum daily discharge, 11.0 ft'is (0.31 '/s), June 25-27. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES MAY AUG DAY OCT NOV DEC JAN FEB MAR APR JUN JUL SEP 1 92 29 64 109 36 21 e12 21 37 2 75 32 54 107 27 19 e12 17 30 3 62 30 48 71 24 186 e13 18 26 4 51 32 50 58 30 188 e23 366 23 5 46 32 63 50 34 71 e13 324 27 44 30 72 43 31 43 e28 54 75 7 43 30 96 37 42 28 e24 31 131 8 60 38 80 29 58 26 e34 23 39 9 64 39 82 34 31 23 e13 20 43 10 54 31 125 34 23 18 e16 18 1090 6 11 79 28 159 69 20 23 e16 96 783 12 121 27 91 44 31 26 e19 137 188 13 --- 102 26 132 51 20 22 e13 55 97 14 62 69 25 111 39 23 14 e15 34 52 15 61 55 64 141 37 22 14 e15 26 60 16 58 51 239 96 31 21 13 e16 22 100 17 60 51 3900 31 15 e10 19 80 18 130 18 87 63 898 69 30 20 17 ell 119 8420 19 62 63 273 57 28 18 20 el2 339 1440 20 55 58 169 51 23 19 16 e12 98 587 20 14 e12 45 311 22 52 100 148 45 24 20 14 e13 21 52 159 135 47 26 34 659 23 59 46 102 93 30 22 13 el4 31 2940 24 83 83 27 13 48 37 66 23 e26 2740 91 86 49 22 20 11 e33 52 596 25 33 17 11 e26 32 393 27 62 36 116 46 19 22 11 e37 26 263 28 52 32 78 40 20 22 e12 36 64 199 29 98 31 --- 41 20 28 eli 25 36 234 30 256 34 72 29 23 e12 19 91 158 31 159 34 82 --- 26 86 32 183 44 20 18 --- 21 63 --- 925 2359 21871 TOTAL 1877 6903 2346 1192 783 589 MEAN 60.5 247 75.7 39.7 25.3 30.8 19.0 76.1 729 MAX 159 3900 159 109 58 188 37 366 8420 MIN 31 25 40 19 17 11 10 17 23 AC-FT 3720 13690 4650 2360 1550 1830 1170 4680 43380 CFSM .56 2.27 .70 .37 .23 .28 .18 .70 6.72 IN. .64 2.37 .80 .41 .27 .32 .20 .81 7.50 e Estimated I I 129 RIO DE LA PLATA BASIN 50044000 RIO DE LA PLATA NEAR COMERIO. PR WATER-QUALITY RECORDS LOCATION.--Lat 18'14'33', long 66'12 1 28`. at bridge on Highway 156. 0.56 (0.9 km) upstream fro dam, about 2.0 ai (3.2 km) northeast of Comerio plaza. DRAINAGE AREA.--139 it (360 keit). excludes 8.2 a (21.1 ka') upstream from Carite Reservoir, the flow of which is diverted to Rio Guamani. PERIOD OF RECORD.--Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 .01S- OXYGEN, OXYGEN COLI- STREP­ CHARGE. SPE- DIS- DEMAND. FORM. TOCOCCI INST. CIFIC SOLVED CHEM- FECAL. FECAL. CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1988 17... 0925 86 365 8.20 24.0 6.1 8.0 96 <10 K100 K200 DEC 20... 0855 59 380 8.30 22.5 3.3 7.8 91 14 K1400 520 FEB 1989 21... 0905 154 276 7.40 22.0 13 8.3 96 <10 K1300 2000 APR 21... 0915 43 412 8.30 23.0 2.6 10 117 25 3000 K320 JUN 19... 1115 13 441 8.10 26.0 4.5 8.6 107 18 K690 K160 AUG 18... 0900 19 388 8.00 26.5 12 7.1 89 66 2000 K1000 HARD- ALKA- KARD- , MESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SIUM. SODIUM, AD- SLUM, WAT WH SULFATE RIDE. TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1988 17... 150 3 35 14 25 0.9 2.3 140 <0.5 16 23 DEC 20... .. al. ma -- 160 aft FEB 1989 21... 96 APR 21... 150 0 36 15 26 0.9 2.4 150 <0.5 16 24 JUN 19... 160 AUG 18... 150 36 15 29 1 3.3 140 22 27 SOLIDS. RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE. DIS- CONSTI- DIS- AT 105 GEN. GEN, GEN. GEM, GEN, DIS- SOLVED TUENTS. SOLVED DEG. C, NITRATE NITRITE NO20403 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) S102) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 17... 0.1 25 226 53 4 0.99 0.01 1.00 0.04 0.36 DEC 20... 8 1.26 0.04 1.30 0.08 0.32 FEB 1989 21... 15 0.88 0.02 0.90 0.04 0.26 APR 21... 0.2 26 238 27 7 0.75 0.05 0.80 0.09 0.41 JUN 19... 9 0.73 0.07 0.80 0.14 0.46 AUG 18... 0.2 28 246 13 29 1.07 0.13 1.20 0.16 1.40 K = non-ideal count RIO OE LA PLATA BASIN 130 50044000 RIO DE LA PLATA NEAR COMERIO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 NITRO- CHRO- GEN.AM- BARIUM, BORON, CADMIUM MIUM. COPPER. MONIA • NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN. GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (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 NO3) AS P) AS AS) AS BA) AS B) AS CO) AS CR) AS CU) OCT 1988 17... 0.4 1.4 6.2 0.26 1 <100 70 <1 35 50 DEC 20... 0.4 1.7 7.5 0.26 FEB 1989 21... 0.3 1.2 5.3 0.16 APR 21... 0.5 1.3 5.8 0.32 1 100 70 <1 2 10 JUN 19... 0.6 1.4 6.2 0.33 AUG 18... 1.6 2.8 7.9 0.43 METHY- IRON. LEAD, NESE. MERCURY SILVER, ZINC, MANGA- 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 DATE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1988 <1 17... 16000 <5 620 <0.1 <1 <1 60 <0.01 0.03 DEC 20... FEB 1989 21... APR <5 30 <1 <1 <10 <0.01 <1 0.08 21... 580 <0.1 JUN 19... AUG 18... I RIO DE LA PLATA BASIN 131 50044850 RIO GUADIANA NEAR KARANJITO. PR WATER-QUALITY RECORDS LOCATION.--Lat 18'18'39'. long 66'13'28'. at steel-cross-bridge 0.8 •i (1.3 k•) northwest of Highway 164. 1.2 •i (1.9 km) upstream from mouth and about 2.0 i (3.2 km) northeast of Naranjito plaza. DRAINAGE AREA.--4.0 •1 (10.3 km'). PERIOD OF RECORD.--Water year 1979 to current year. WATER-QUALITY DATA. WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 '01S- OXYGEN. OXYGEN COLI- STREP- CHARGE. SPE- 01S- DEMAND. FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL. FECAL. CUBIC CON- PH TEMPER- TUR- OXYGEN. (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1988 17... 1215 6.2 333 8.30 26.0 2.1 8.1 99 120 1000 600 DEC 20... 1110 7.6 300 8.40 23.0 1.4 9.2 106 12 K760 470 FEB 1989 21... 1040 11 313 8.00 22.0 2.0 8.3 96 <10 K620 750 APR 21... 1245 6.8 343 8.60 24.5 0.4 9.8 117 13 K82 K120 JUN 19... 1345 4.7 363 8.60 26.0 4.0 9.1 111 15 330 K190 AUG 18... 1200 3.9 341 8.20 27.0 3.0 8.4 105 66 2100 650 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCAR8 CALCIUM SLUM, SODIUM, AD- SIUM, WAT WH SULFATE RIDE. TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE 015- DIS- (MG/L TOT FLO SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1988 17... 140 22 30 15 19 0.7 2.1 120 2.2 14 21 DEC 20... 120 FEB 1989 21... 110 APR 21... 130 9 30 14 17 0.7 2.1 120 <0.5 14 21 JUN 19... 120 AUG 18... 140 31 14 20 0.7 2.4 120 13 21 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE. DIS- CONSTI- DIS- AT 105 GEM. GEN. GEN. GEN. GEM. DIS- SOLVED TUENTS. SOLVED DEG. C. NITRATE NITRITE NO20403 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL GATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) BAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 17... 0.1 29 199 3.3 3 1.59 0.01 1.60 0.03 0.37 DEC 20... 5 1.57 0.03 1.60 0.01 0.19 FEB 1989 21... 1 <0.01 1.40 0.03 APR 21... 0.1 24 197 3.6 4 0.88 0.02 0.90 0.04 0.26 JUN 19... 8 0.98 0.02 1.00 0.03 0.37 AUG 18... 0.1 29 207 2.2 16 0.88 0.02 0.90 0.02 0.48 K non-ideal count 132 RIO OE LA PLATA BASIN 50044850 RIO GUADIANA NEAR KARANJITO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 NITRO- CHRO- GEN.AM- BARIUM. BORON. CADMIUM MIUM, COPPER, MONIA . NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEM, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (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 NO3) AS P) AS AS) AS BA) AS B) AS CO) AS CR) AS CU) OCT 1988 17... 0.4 2.0 8.9 0.31 1 <100 40 <1 .,1 <10 DEC 20... 0.2 1.8 8.0 0.23 FEB 1989 21... <0.2 0.17 APR 21... 0.3 1.2 5.3 0.23 1 100 30 <1 2 10 JUN 19... 0.4 1.4 6.2 0.25 AUG 18... 0.5 1.4 4.2 0.37 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- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CM) (UG/L) (MG/L) OCT 1988 17... 210 <5 20 0.1 <1 1 <10 <0.01 2 0.04 DEC 20... FEB 1989 21... APR 21... 100 <5 10 <0.1 <1 <1 <10 <0.01 3 0.06 JUN 19... AUG 18... I I I I I I RIO DE LA PLATA BASIN 50045000 LAGO LA PLATA AT DAMSITE, PR 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 i (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 mil (469 km2). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--February to September 1989. GAGE.--Water-stage recorder. Datu 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 hm 3) 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 ). The dam spillway is provided with 6 bascule gates. The spillway crest has a total clear length of 690 ft (210.3 ), an elevation of 154.6 ft. (47.1 ). The Dam is owned and operated by Puerto Rico Aqueduct and Sewer Authority. Gage-height and precipitation satellite telemetry at station. EXTREMES OBSERVED FOR CURRENT PERIOD.--Maximum elevation, 158.31 ft. (48.2 m), Feb. 17, minimum elevation, 146.96 ft (44.8 m). Capacity Table (based on data fro Puerto Rico Aqueduct and Sewer Authority) Elevation, in feet Contents, in acre-feet Elevation, in feet Contents, in acre-feet 133 98.43 2,760 164.05 131.24 11,360 170.61 154.60 22,720 175.52 ELEVATION (FEET NGVD), WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 OBSERVATION AT 24:00 VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL 1 154.90 154.98 153.90 153.35 151.54 2 154.87 155.13 153.93 153.65 151.37 3 154.79 154.84 154.99 153.88 154.48 151.19 4 154.78 154.83 154.94 153.94 155.20 151.00 5 154.77 154.85 154.88 153.98 154.99 150.86 6 154.74 154.93 154.83 153.98 154.92 150.97 7 154.72 154.99 154.80 153.99 154.92 151.07 8 154.74 154.94 154.79 153.98 154.80 151.02 9 154.79 154.96 154.77 153.90 154.70 150.92 10 154.80 155.04 154.79 153.83 154.60 150.79 11 154.80 155.10 154.87 153.75 154.55 150.63 12 154.78 155.04 154.90 153.73 154.46 150.45 13 154.77 155.11 154.90 153.64 154.35 150.30 14 154.73 155.08 154.90 153.55 154.21 150.09 15 154.99 155.09 154.87 153.44 154.06 149.88 16 155.24 155.11 154.81 153.32 153.93 149.71 17 156.82 155.10 154.78 153.16 153.87 149.56 18 155.44 155.03 154.74 153.02 153.77 149.35 19 155.29 155.03 154.69 152.88 153.65 149.13 20 155.14 154.91 154.65 152.75 153.51 148.91 21 155.10 154.86 154.57 152.62 153.38 148.72 22 155.14 154.82 154.49 152.50 153.23 148.55 23 155.04 154.91 154.41 152.37 153.09 148.46 24 155.02 154.92 154.34 152.25 152.92 148.31 25 155.05 154.88 154.23 152.43 152.76 148.22 26 155.53 154.83 154.13 152.37 152.56 148.08 27 155.11 154.82 154.01 152.27 152.35 147.93 28 154.97 154.86 153.91 152.19 152.13 147.89 29 154.82 153.95 152.18 151.90 147.78 30 155.21 153.90 152.21 151.69 147.62 31 155.28 152.58 147.48 MEAN 154.97 154.63 153.18 153.73 149.61 MAX 155.28 155.13 153.99 155.20 151.54 MIN 154.82 153.90 152.18 151.69 147.48 AUG SEP 147.34 150.46 147.16 150.52 147.10 150.56 147.42 150.46 149.44 150.44 149.78 150.33 149.71 151.15 149.46 152.27 149.21 152.34 149.07 154.84 148.86 154.85 148.94 154.85 149.00 154.84 148.91 154.84 148.76 154.84 148.57 155.04 148.47 155.07 148.52 158.14 149.74 157.16 150.10 155.85 150.17 155.38 150.07 155.54 150.09 156.74 150.08 155.46 150.09 155.20 149.96 155.21 149.79 155.17 149.73 155.08 149.93 155.15 150.23 155.13 150.42 149.23 154.10 150.42 158.14 147.10 150.33 28,550 33,160 37,040 I I I I I 134 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' (539 km 2 ), excludes 8.2 mil (21.2 km 2 ) upstream from Lago Carite, flow from which is diverted to Rio Guamani. Area at site used prior to September 25, 1984, 200 mi' (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 Tod Alta, P.R.; October 1984 to September 1988 published as 50046900. GAGE.--Water-stage recorder. Datum of gage is 17.00 ft (5.182 m), about mean sea level. Prior to October , 1984, at site about 1.0 mi (1.6 km) upstream 6.56 ft (2.000 ) above mean sea level datum. REMARKS.--Records fair. 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.--29 years (1961-89), 280 ftqs (7.930 nags), 19.01 in/yr (483 mm/yr), 202,900 acre-ft/yr (250 hm'/yr); median of yearly mean discharges, 237 ft3/s (6.71 m'/s), 172,000 acre-ft/yr (212 hm'/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 95,500 ft'/s (2,700 m'/s), Sept. 6, 1960, gage height, 36.35 ft (11.079 m), from floodmark, fro rating curve extended above 12,000 ft'is (340 10/s) on basis of contracted-opening measurement of peak flow at site 1.0 mi upstream and different datum; minimum discharge, 2.2 ft'is (0.062 m'/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 ft'is (3,400 '/s), gage height, 37.4 ft (11.40 m); June 16, 1943, 82,000 ft'is (2,322 '/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 ft'/s (170 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (fti/s) (•3/s) (ft) (m) Date Time (f't/s) (m'/s) (ft) (m) Feb. 17 1845 10,700 303 14.87 4.532 Sept. 24 0700 8,950 253 13.89 4.234 Sept.18 1445 *37,400 1,060 *21.47 6.544 Minimum discharge, 10 ft'is (0.283 '/s), May 27, 28. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 126 262 93 140 38 130 408 22 149 19 53 55 2 90 110 73 80 33 99 344 64 124 26 30 55 3 106 271 58 58 29 78 384 45 201 24 125 49 4 208 213 57 49 27 65 206 27 131 22 104 39 5 329 181 59 45 26 57 116 29 183 29 32 41 6 201 114 46 38 25 73 82 27 85 27 27 43 7 145 79 67 51 22 94 63 40 78 59 23 67 8 123 126 55 96 27 109 47 34 69 40 23 95 9 102 105 53 107 31 104 38 22 47 26 18 86 10 86 117 64 183 29 97 34 22 32 19 202 78 11 71 87 69 306 28 130 34 21 42 36 126 1410 12 56 106 61 300 26 145 34 22 25 39 124 387 13 56 101 51 236 31 150 41 18 27 20 47 447 14 115 202 46 154 29 163 39 16 26 19 35 185 15 117 220 42 96 55 158 39 15 26 18 27 98 16 88 142 37 70 240 142 34 16 25 18 66 91 17 69 2230 33 78 4840 144 30 20 179 19 238 306 18 73 1480 34 73 2550 154 26 23 56 35 98 14200 19 72 529 36 74 626 117 24 24 27 47 154 3870 20 65 295 44 157 316 99 21 15 24 41 91 1250 21 56 204 42 106 211 69 19 19 25 19 47 768 22 217 522 40 203 193 53 18 21 23 24 36 778 23 391 691 45 121 169 45 18 20 22 22 80 2600 24 154 218 108 68 122 51 20 18 22 19 50 4980 25 124 127 98 50 87 72 22 19 20 389 38 1100 26 93 566 125 42 578 58 20 21 22 114 33 620 27 71 315 82 37 820 46 20 11 25 56 50 668 28 68 201 66 37 236 42 23 12 22 42 34 386 29 124 119 60 39 --- 43 47 16 24 27 120 272 30 307 105 225 49 45 56 25 22 22 81 253 31 629 --- 289 46 339 --- 94 --- 36 38 --- TOTAL 4532 10038 2258 3189 11444 3171 2307 798 1783 1353 2250 35277 MEAN 146 335 72.8 103 409 102 76.9 25.7 59.4 43.6 72.6 1176 MAX 629 2230 289 306 4840 339 408 94 201 389 238 14200 MIN 56 79 33 37 22 42 18 11 20 18 18 39 AC-FT 8990 19910 4480 6330 22700 6290 4580 1580 3540 2680 4460 69970 CFSM .73 1.67 .36 .51 2.05 .51 .38 .13 .30 .22 .36 5.89 IN. .84 1.87 .42 .59 2.13 .59 .43 .15 .33 .25 .42 6.57 CAL YR 1988 TOTAL 90040 MEAN 246 MAX 7640 MIN 13 AC-FT 178600 CFSM 1.23 IN. 16.76 WTR YR 1989 TOTAL 78400 MEAN 215 MAX 14200 MIN 11 AC-FT 155500 CFSM 1.08 IN. 14.60 I I I I RIO DE LA PLATA BASIN 50046000 RIO DE LA PLATA AT HWY 2 NR TOA ALTA, PR (National stream-quality accounting network station) WATER-QUALITY RECORDS LOCATION.--Lat 18°24'41% long 66'15'39', at Highway 2, 1.3 •i (2.1 k•) downstream fro Rio Lajas, and 1.6 •i (2.6 km) northwest of Toa Alta, 11.3 i (18.2 km) downstream fro Puerto Rico Aqueduct and Sewer Authority reservoir. DRAINAGE AREA.--208 (539 k•'), exclude 8.2 •1 2 (21.2 km') upstream fro Lago Carite. flow from which is diverted to Rio Guamani. PERIOD OF RECORD.--Water years 1958 to current year WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 DIS- OXYGEN, COL'. STREP- CHARGE, SPE- DIS- FORM, TOCOCCI HARD- INST. CIFIC SOLVED FECAL. FECAL, NESS CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- 0.7 KF AGAR TOTAL FEET DUCT- (STAND- ATURE BID- DIS- CENT UM-MF (COLS. (MG/L DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- (COLS./ PER AS SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) 100 ML) 100 ML) CAC03) OCT 1988 14... 1110 80 411 7.60 27.0 5.5 7.2 90 K910 370 170 DEC 19... 1325 34 413 7.80 27.0 2.0 7.8 112 K150 20 160 FEB 1989 17... 1330 87 319 7.70 23.5 200 7.6 89 K7700 24000 130 APR 10... 1050 32 431 7.80 26.0 3.0 8.2 99 3600 30 180 JUN 13... 1100 29 480 7.60 26.0 2.1 7.5 91 500 K91 200 AUG 11... 1030 72 284 7.50 26.0 220 3.5 43 K50000 35000 110 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- FLUO- SILICA, NONCARB CALCIUM S1UM, SODIUM. AD- SIUM. WAT WH SULFATE RIDE, RIDE, DIS- WH MAT DIS- DIS- DIS- SORP- DIS- TOT FET DIS- DIS- DIS- SOLVED TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD SOLVED SOLVED SOLVED (MG/L DATE MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L AS CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS SO4) AS CL) AS F) S102) OCT 1988 14... 12 49 11 19 0.7 2.7 150 19 21 0.1 20 DEC 19... 5 49 10 19 0.7 2.3 160 21 23 0.1 17 FEB 1989 17... 0 32 11 17 0.7 3.5 130 17 18 0.1 21 APR 10... 7 52 11 20 0.7 2.0 170 18 22 0.1 18 JUN 13... 18 60 12 21 0.7 2.4 180 16 25 0.2 19 AUG 11... 0 35 6.4 11 0.4 3.5 110 13 12 0.2 10 SOLIDS. SOLIDS, NITRO- NITRO- NITRO- NITRO- PROS- PHOS- RESIDUE SUM OF SOLIDS, GEN. GEN. GEN. GEN,AM- PROS- PHOROUS PHATE. AT 180 CONSTI- DIS- NO2•103 AMMONIA AMMONIA MONIA ' PROS- PHOROUS ORTHO. ORTHO, DEG. C TUENTS, SOLVED DIS- DIS- DIS- ORGANIC PHOROUS DIS- DIS- DIS- 01S- DIS- (TONS SOLVED SOLVED SOLVED TOTAL TOTAL SOLVED SOLVED SOLVED DATE SOLVED SOLVED PER (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L) (MG/L) DAY) AS N) AS N) AS NH4) AS N) AS P) AS P) AS P) AS PO4) OCT 1988 14... 244 238 51 0.40 0.11 0.14 1.0 0.13 0.11 0.10 0.31 DEC 19... 246 241 22 0.15 0.26 0.33 0.7 0.16 0.15 0.14 0.43 FEB 1989 17... 178 202 48 0.10 0.13 0.17 2.7 0.70 0.08 0.07 0.21 APR 10... 250 246 21 0.45 0.06 0.08 0.5 0.12 0.06 0.04 0.12 JUN 13... 287 268 21 0.57 0.11 0.14 0.4 0.13 0.14 0.09 0.28 AUG 11... 164 155 30 0.48 0.12 0.15 0.9 0.16 0.04 0.05 0.15 K i non-ideal count 135 136 RIO OE LA PLATA BASIN 50046000 RIO OE LA PLATA AT HWY 2 NR TOA ALTA, PR--Continued (National stream-quality accounting network station) WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 ALUM- BERYL- CHRO- INUM, ARSENIC BARIUM, LIUM. CADMIUM MIUM. COBALT, COPPER, IRON. LEAD. DIS- DIS- 01S- DIS- DIS- DIS- DIS- DIS- DIS- DIS- SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS AL) AS AS) AS BA) AS 8E) AS CD) AS CR) AS CO) AS CU) AS FE) AS P8) OCT 1988 14... 40 1 48 <0.5 1 <1 <3 4 6 <5 OEC 19... -- FEB 1989 17... 30 2 43 <0.5 3 <1 <3 1 30 <5 APR 10... JUN 13... 30 1 53 <0.5 <1 <1 <3 1 7 <1 AUG 11... 30 1 61 <0.5 1 <1 <3 3 38 3 MANGA- MOLYB- SELE- STROM- VANA- LITHIUM NESE, MERCURY DENUM. NICKEL. NIUM, SILVER, TIUM. DIUM, ZINC. 01S- DIS- DIS- DIS- DIS- DIS- DIS- DIS- 01S- DIS- SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED GATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS LI) AS MN) AS HG) AS MO) AS NI) AS SE) AS AG) AS SR) AS V) AS ZN) OCT 1988 14... 4 22 <0.1 <10 <1 <1 <1.0 190 6 <3 DEC 19... FEB 1989 17... 6 130 <0.1 <10 <1 <1 <1.0 130 11 7 APR 10... JUN 13... <4 74 <0.1 <10 1 <1 <1.0 240 <6 7 AUG 11... 4 88 <0.1 <10 2 <1 <1.0 130 6 <3 PESTICIDE ANALYSES CHLOR- DI- DI- ENDO- PCB, ALDRIN, DANE, ODD, DOE, DOT. AZINON, ELORIN SULFAN, DATE 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) JUN 13... 1100 <0.1 <0.01 <0.1 <0.01 <0.01 <0.01 0.05 c0.01 <0.01 HEPTA- METH- METHYL METHYL HEPTA- CHLOR MALA- OXY- PARA- TRI- ENOR1N, ETHION. CHLOR, EPDXIDE LINDANE THION. CHLOR, THION. THION. MIREX. DATE 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) JUN 13... <0.01 <0.01 <0.01 <0.01 <0.01 2.0 <0.01 <0.01 <0.01 <0.01 KAPH- THA- LENES, PARA- POLY- PER- TOX- TOTAL THION. CHLOR. THANE APHENE. TRI- 2.4-0. 2.4.5-T 2. 4-OP S1LVEX. 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) JUN 13... <0.01 <0.1 <0.1 <1 <0.01 <0.01 <0.01 <0.01 <0.01 RIO DE LA PLATA BASIN 50u46000 RIO DE LA PLATA AT HWY 2 NR TOA ALTA, PR--Continued (National stream-quality accounting network station) WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT SED. SE0I- SUSP. WENT. SIEVE STREAM- SEDI- BIS- DIAM. FLOW, MENT, CHARGE, PERCENT INSTAN- SUS- SUS- FINER DATE TIME TANEOUS PENDED PENDED THAN (CFS) (MG/L) (T/DAY) .062 MM OCT 1988 14... 1105 80 27 6 70 DEC 1989 19... 1320 34 4 .37 43 FEB 17... 1310 87 470 110 80 APR 10... 1035 32 56 5 90 JUN 13... 1100 29 332 26 81 AUG 11... 1030 72 251 49 97 137 138 THIS PAGE WAS LEFT BLANK INTENTIONALLY 139 ATLANTIC OCEAN SAN JUAN or 9920 1-* 7530 218 E CATARO Drainage boundaries indeterminate • in limestone terrane • v'• 20 tn • PN-2 '13 0491.221 'at 0 N-6 PN 219 °-PN-7 49310 Limestone SAYAMO 0490 48510....\ PN-1( 22 Igneous and • N-1 ,ada Sd sedimentary rocks Represa de Rio Piedras RIO 047990 o 0488 048770, Minillas GUA NABO 3 E ilTRUJILLO ALTO Lapo Los Curios 7850 rainage boundary I Drainage boundary AGUAS BUENAS M • 7 Rio de lo Plato basin Rio Grande de Lo;ra basin 7 47 0 7 ) Logo de z". Cidro CIDRA ••.\) EXPLANATION A0490 SURFACE WATER STATION AND NUMBERS 0476 QUALITY—OF WATER STATION V AND NUMBER .220 WELL AND WELL NUMBER .047550 LAKE—ELEVATION STATION Map area .AGUADO. LA SAN JUAN MAYAGUEZ 0I0 1 I 2 I I 1 3 2 4 6 KILOMETERS 3 4 6 MILES PONCE. Figure 18.--Rio Hondo to Rio Puerto Nuevo basins. I I 140 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 fro bridge on de Diego Expressway and 1.1 i (1.8 km) above mouth. DRAINAGE AREA.--Indeterminate. PERIOD OF RECORD.--Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 DATE OCT 1988 TIME DIS- CHARGE, INST. CUBIC FEET PER SECOND SPE- CIFIC CON- DUCT- ANCE (US/CM) PH (STAND- ARD UNITS) TEMPER- ATURE WATER (DEG C) TUR- BID- ITY (NTU) OXYGEN, DIS- SOLVED (MG/L) OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) COLI- FORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) 20... 1330 NF 5400 7.40 29.0 33 5.2 67 23 K83000 2000 DEC 22... 0830 NF 16000 8.10 26.0 7.7 5.4 64 430 53000 2700 FEB 1989 27... 0830 NF 936 7.10 23.0 260 5.2 59 <10 K71000 K130000 APR 25... 1300 NF 34000 8.50 32.0 3.0 16.0 217 250 K100 K200 JUN 22... 0740 NF 10000 8.80 25.0 2.9 9.7 115 80 K12000 K500 AUG 30... 0840 NF 400 7.50 26.5 10 5.1 63 13 290000 61000 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM S1UM, SODIUM, AD- S1UM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1988 20... 500 430 51 90 700 14 19 80 <0.5 190 1300 DEC 22... 130 FEB 1989 27... 52 APR 25... 4200 4000 280 840 6800 46 68 160 <0.5 1800 12000 JUN 22... 160 AUG 30... 730 590 60 140 1200 20 54 62 -- 380 2500 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 20... 0.1 7.8 2400 47 0.33 0.07 0.40 1.20 1.30 DEC 22... 20 0.23 0.07 0.30 1.30 1.70 FEB 1989 27... 266 0.26 0.04 0.30 0.47 1.80 APR 25... 0.6 3.4 21900 20 0.04 <0.10 0.33 0.47 JUN 22... 7 0.18 0.12 0.30 0.59 1.0 AUG 30... 0.3 11 4400 15 0.13 0.07 0.20 0.17 0.83 NF = No flow K = non-ideal count RIO HONDO BASIN 50047530 RIO HONDO AT FLOOD CHANNEL NEAR CATANO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (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 NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1988 20... 2.5 2.9 13 0.35 2 100 330 <1 2 10 DEC 22... 3.0 3.3 15 0.61 FEB 1989 27... 2.3 2.6 12 0.27 APR 25... 0.8 0.38 2 200 2500 <1 <10 50 JUN 22... 1.6 1.9 8.4 0.32 AUG 30... 1.0 1.2 10 0.11 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- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1988 20... 1800 <5 160 0.1 <1 1 30 <0.01 3 0.37 DEC 22... FEB 1989 27... APR 25... 490 <5 180 0.1 <1 <1 40 <0.01 5 1.9 JUN 22... AUG 30... 141 142 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 , (21.4 km2 ). ELEVATION RECORDS PERIOD OF 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 OF RECORD.--Maximum elevation 1,323.99 ft (403.552 m), Feb. 3, 1988; minimum elevation 1,306.01 ft (398.072 m), July 6, 1989. EXTREMES OBSERVED FOR CURRENT YEAR.--Maximum elevation, 1,323.24 ft (403.324 m), Feb. 18; minimum elevation, 1,306.01 ft (398.072 m), July 6. Capacity Table (based on data from Puerto Rico Electric Power Authority) Elevation, in feet Contents, in acre-feet Elevation, in feet Contents, in acre-feet 1,306 2,010 1,319 4,400 1,309 2,610 1,322 5,200 1,312 3,100 1,324 5,800 ELEVATION (FEET MUD), WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 OBSERVATION AT 24:00 VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 1321.53 1321.09 1321.67 1318.84 1317.48 1322.34 1321.28 1318.43 1312.07 1306.10 1307.12 1311.53 2 1321.46 1320.95 1321.57 1318.74 1317.33 1322.30 1321.29 1318.32 1311.95 1306.04 1307.14 1311.76 3 1321.40 1320.83 1321.46 1318.66 1317.25 1322.27 1321.26 1318.17 1311.96 1306.03 1307.22 1311.86 4 1321.52 1320.75 1321.34 1318.58 1317.10 1322.21 1321.22 1318.00 1311.95 1306.03 1308.32 1311.88 5 1321.45 1320.65 1321.21 1318.47 1316.94 1322.15 1321.13 1317.87 1311.80 1306.03 1308.53 1311.92 6 1321.43 1320.58 1321.07 1318.34 1316.81 1322.21 1321.03 1317.76 1311.63 1306.14 1308.62 1311.91 7 1321.43 1320.49 1320.95 1318.22 1316.71 1322.16 1320.93 1317.67 1311.44 1306.31 1308.68 1311.91 8 1321.38 1320.44 1320.80 1318.28 1316.68 1322.10 1320.86 1317.63 1311.19 1306.39 1308.65 1311.93 9 1321.34 1320.45 1320.68 1318.24 1316.60 1322.20 1320.77 A 1310.86 1306.44 1308.56 1311.88 10 1321.32 1320.42 1320.58 1318.30 1316.49 1322.13 1320.81 A 1310.58 1306.47 1308.51 1312.63 11 1321.28 1320.40 1320.44 1318.33 1316.34 1322.05 1320.75 A 1310.49 1306.47 1308.49 1312.85 12 1321.28 1320.36 1320.31 1318.37 1316.20 1321.96 1320.74 1316.92 1310.25 1306.41 1308.53 1312.93 13 1321.30 1320.32 1320.20 1318.36 1316.09 1321.92 1320.72 1316.71 1310.05 1306.37 1308.54 1313.13 14 1321.31 1320.29 1320.07 1318.30 1315.97 1321.90 1320.67 1316.50 1309.89 1306.28 1308.54 1313.29 15 1321.29 1320.24 1319.96 1318.26 1316.44 1321.85 1320.59 1316.30 1309.66 A 1308.55 1313.39 16 1321.24 1320.35 1319.90 1318.23 1316.80 1321.79 1320.53 1316.06 1309.43 A 1308.54 1313.62 17 1321.25 1322.60 1319.83 1318.23 1323.08 1321.72 1320.45 1315.83 1309.20 A 1308.60 1314.11 18 1321.26 1322.67 1319.73 1318.22 1322.74 1321.62 1320.31 1315.59 1308.93 A 1308.88 A 19 1321.28 1322.58 1319.61 1318.18 1322.57 1321.51 1320.18 1315.32 1308.69 A 1309.26 A 20 1321.32 1322.51 1319.49 1318.14 1322.50 1321.41 1320.04 1315.09 1308.47 A 1309.50 A 21 1321.33 1322.42 1319.35 1318.63 1322.68 1321.33 1319.90 1314.79 1308.24 A 1309.66 A 22 1321.35 1322.32 1319.27 1318.60 1322.59 1321.23 1319.78 1314.47 1308.06 A 1309.73 A 23 1321.30 1322.23 1319.14 1318.53 1322.56 1321.14 1319.64 1314.19 1307.85 A 1310.05 A 24 1321.29 1322.13 1319.04 1318.42 1322.52 1321.03 1319.51 1313.91 1307.62 A 1310.27 A 25 1321.25 1322.22 1318.93 1318.30 1322.45 1320.92 1319.38 1313.58 1307.36 A 1310.38 A 26 1321.22 1322.12 1318.79 1318.22 1322.54 1320.82 1319.22 1313.30 1307.15 A 1310.46 A 27 1321.18 1322.03 1318.64 1318.14 1322.45 1320.77 1319.04 1313.09 1306.90 A 1310.61 A 28 1321.13 1321.93 1318.55 1318.02 1322.39 1320.67 1318.86 1312.84 1306.68 1306.68 1310.66 A 29 1321.16 1321.85 1318.75 1317.88 --- 1321.15 1318.72 1312.57 1306.42 1306.78 1311.03 A 30 1321.12 1321.77 1318.98 1317.76 --- 1321.37 1318.57 1312.38 1306.25 1306.96 1311.24 A 31 1321.10 --- 1318.92 1317.62 --- 1321.33 --- 1312.22 --- 1307.05 1311.47 MEAN 1321.31 1321.33 1319.97 1318.30 1319.22 1321.66 1320.27 --- 1309.43 1309.17 MAX 1321.53 1322.67 1321.67 1318.84 1323.08 1322.34 1321.29 --- 1312.07 1311.47 MIN 1321.10 1320.24 1318.55 1317.62 1315.97 1320.67 1318.57 --- 1306.25 1307.12 A No gage-height record. 143 RIO DE aAYAMON BASIN 50047600 RIO DE &AYAMON 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 km) west of Aguas Buenas plaza. DRAINAGE AREA.--18.5 mi , (47.9 km2 ). PERIOD OF RECORD.--Water years 1958-65, 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1988 13... 1330 28 232 8.30 23.5 16 8.5 102 24 K1400 730 DEC 07... 1410 38 221 7.80 23.5 15 8.1 97 21 330 560 FEB 1989 14... 1400 31 244 8.50 22.0 3.8 9.2 106 12 230 450 APR 05... 1430 13 220 8.40 23.0 36 8.6 102 <10 330 500 JUN 14... 1500 30 275 8.30 24.0 3.9 8.7 104 15 K100 350 AUG 24... 1545 28 265 8.20 25.0 34 7.6 94 36 3500 3000 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SIUM, SODIUM, AD- SIUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- 01S- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1988 13... 87 7 20 8.9 13 0.6 2.7 78 1.1 13 14 DEC 07... 81 FEB 1989 14... 93 APR 05... 82 0 19 8.3 13 0.6 2.6 83 <0.5 12 13 JUN 14... 95 AUG 24... 89 2 21 8.9 14 0.7 2.7 95 8.5 14 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO20403 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 13... 0.1 23 143 11 46 0.49 0.01 0.50 0.01 0.59 DEC 07... 6 <0.01 0.60 0.02 0.48 FEB 1989 14... 12 <0.01 0.30 0.02 0.48 APR 05... 0.1 22 140 5.1 114 0.38 0.02 0.40 0.02 0.28 JUN 14... 5 <0.01 0.20 0.02 0.38 AUG 24... 0.1 23 140 11 18 0.67 0.03 0.70 0.04 0.36 K non-ideal count 144 RIO DE BAYAMON BASIN 50047600 RIO DE BAYAMON NEAR AGUAS BUENAS, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (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 NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1988 13... 0.6 1.1 4.9 0.04 1 <100 <10 1 2 <10 DEC 07... 0.5 1.1 4.9 0.08 FEB 1989 14... 0.5 0.8 3.5 0.03 APR 05... 0.3 0.7 3.1 0.06 1 100 20 1 12 10 JUN 14... 0.4 0.6 2.7 0.03 AUG 24... 0.4 1.1 4.9 0.04 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- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1988 13... 1700 <5 50 <0.1 <1 <1 20 <0.01 1 0.03 DEC 07... FEB 1989 14... APR 05... 5600 <5 510 <0.1 <1 1 30 <0.01 1 0.03 JUN 14... AUG 24... 145 RIO DE BAYAMON BASIN 50047850 RIO BAYAMON NR BAYAMON, P.R. LOCATION.--Lat 18°20'08", long 66°08'13", Hydrologic Unit 21010005, on left bank, at rock quarry near Highway 174, 1.3 mi'(2.09 km') south of colonia Santa Rosa and 4.7 mi (7.56 km) south of the plaza in Bayamun. DRAINAGE AREA.--41.8 mi' (108.3 km 2). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--September 1964 to October 1970, June 1988 to September 1989. GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 98 ft (30 m), from topografic map. REMARKS.--Diversion to the Guaynabo water treatment plant, for municipal supply, made upstream from station (at Represa de San Juan). Flow is regulated by storage and release of water at Lago de Cidra (capacity 5,220 acre-ft), 10.5 mi (16.9 km) upstream. Gage-height and precipitation satellite telemetry at station. AVERAGE DISCHARGE.--7 years (1965-70,1989), 39.5 ftl/s (1.12 m 3/s), 12.83 in/yr (326 mm/yr), 28,620 acre-ft/yr (35.3 hm 3/yr). EXTREMES FOR PERIOD OF RECORDS.--Maximum discharge 28,000 ft3/s (793 m'/s), Oct. 9, 1970, gage height 20.2 ft (6.16 m), from rating curve extended above 1,000 fti/s (28.3 m'/s) on basis of step-back water analysis; minimum discharge, 0.7 ft'is (0.020 m 3/s) July 2, 1967. EXTREMES FOR CURRENT YEAR.--Maximum discharge 13,490 ft3/s (382 20/s), Sept. 18, gage height, 17.76 ft (5.41 m), from floodmarks and rating curve extended above 300 ft'is (8.50 m'/s) on basis of step-backwater analysis; minimum discharge, 7.0 ft'is (0.200 m 3/s), July 30. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 19 21 22 16 14 15 41 15 114 18 11 22 2 24 18 21 13 15 14 65 28 69 15 8.8 77 3 27 16 21 12 14 13 59 19 100 13 12 55 4 27 16 21 12 16 13 30 40 84 12 61 22 5 24 17 19 12 15 13 20 27 29 17 70 19 6 19 17 19 11 15 16 17 19 19 31 14 18 7 19 18 19 16 15 21 15 22 16 29 13 62 8 17 27 19 48 17 15 44 17 14 15 12 54 9 16 17 19 64 17 38 18 14 13 12 10 25 10 16 15 24 45 13 21 19 13 13 12 61 75 11 16 24 20 124 13 15 23 13 14 32 22 63 12 17 15 17 92 11 22 18 13 13 14 16 65 13 16 65 16 47 11 35 18 13 13 12 14 44 14 16 68 17 19 10 17 16 12 13 11 13 28 15 24 23 17 15 32 14 14 13 13 9 8 12 43 16 18 31 16 17 64 61 14 12 14 9.7 .12 34 17 16 153 16 28 1130 51 15 11 41 12 16 81 18 16 61 15 17 281 27 14 12 19 10 47 2340 19 16 26 14 15 51 18 14 13 16 9.9 24 95 20 16 20 14 16 24 13 14 13 16 9.2 16 57 21 20 22 14 33 22 12 14 13 16 9 5 20 160 22 101 325 16 23 24 12 13 13 15 9 7 14 78 23 45 119 29 14 21 12 13 13 14 18 25 137 24 19 60 31 14 16 13 13 13 13 12 19 273 25 18 43 42 13 15 12 13 25 13 10 15 119 26 16 54 20 14 112 11 13 18 13 9.3 13 109 27 16 37 17 17 95 12 13 16 12 9.8 13 125 28 20 28 15 14 26 13 13 15 12 9.9 12 54 29 105 24 19 15 --- 11 26 13 13 8.9 76 34 30 58 23 107 14 41 21 17 12 8.2 121 26 31 44 --- 29 14 65 --- 66 --- 20 21 --- TOTAL 841 1403 705 824 2109 666 640 561 776 428.9 813.8 4394 MEAN 27.1 46.8 22.7 26.6 75.3 21.5 21.3 18.1 25.9 13.8 26.3 146 MAX 105 325 107 124 1130 65 65 66 114 32 121 2340 MIN 16 15 14 11 10 11 13 11 12 8.2 8.8 18 AC-FT 1670 2780 1400 1630 4180 1320 1270 1110 1540 851 1610 8720 CFSM .65 1.12 .54 .64 1.80 .51 .51 .43 .62 .33 .63 3.50 IN. .75 1.25 .63 .73 1.88 .59 .57 .50 .69 .38 .72 3.91 WTR YR 1989 TOTAL 14161.7 MEAN 38.8 MAX 2340 MIN 8.2 AC-FT 28090 CFSM .93 IN. 12.60 I I I 146 RIO DE BAYAMON BASIN 50047990 RIO GUAYNABO NEAR BAYAMON, PR WATER-QUALITY RECORDS LOCATION.--Lat 18'22'32'. long 66'07'59', at bridge on Highway 833, 0.2 mi (0.3 km) upstream fro Rio de Bayamon, and 2.3 i (3.7 km) southeast of Bayamon plaza. DRAINAGE AREA.--13.2 i' (189.6 km'). PERIOD OF RECORD.--Water years 1958. 1964, 1971-73. 1976, 1979 to current year. WATER-QUALITY DATA. WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 -01S- OXYGEN. OXYGEN COLT- STREP- CHARGE. SPE- DIS- MONO. FORM. TOCOCCI INST. C1FIC SOLVED CHEM- FECAL. FECAL. CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE 81D- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER 1TY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (NG/L) 100 ML) 100 ML) OCT 1988 14... 0730 21 440 7.60 23.0 4.6 5.6 65 20 210000 9100 OEC 09... 0735 23 408 7.60 22.0 3.8 6.2 70 13 K12000 5400 FEB 1989 16... 0730 29 334 7.70 21.5 47 6.8 76 16 20000 73000 APR 06... 0820 20 403 7.80 22.0 19 7.0 78 18 K17000 3400 JUN 02... 0840 124 318 7.30 22.0 45 6.9 78 24 21000 24000 AUG 09... 1000 26 427 7.90 26.5 6.2 6.2 76 21 20000 K1500 HARD- ALKA- KARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SLUM. SODIUM. AD- SIUM. WAT WH SULFATE RIDE. TOTAL WH WAT DIS- D1S- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED T1ON SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS 5) AS SO4) AS CL) OCT 1988 14... 160 0 41 13 26 0.9 3.3 160 <0.5 15 28 DEC 09... 150 FEB 1989 16... 120 APR 06... 150 1 40 12 23 0.8 3.2 150 <0.5 16 24 JUN 02... 100 AUG 09... 160 0 45 12 26 0.9 3.3 160 15 27 SOLIDS. RESIDUE FLUO- SILICA. SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE. 015- CONSTI- DIS- AT 105 GEN. GEM, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO20403 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 14... 0.1 28 251 14 25 0.52 0.08 0.60 0.25 0.45 DEC 9 0.74 0.06 0.80 0.18 0.52 09... FEB 1989 16... 48 0.55 0.05 0.60 0.11 0.49 APR 06... 0.1 29 237 13 48 0.55 0.05 0.60 0.10 0.30 JUN 02... 71 0.04 0.76 0.80 0.11 0.59 AUG 0.49 09... 0.2 28 254 19 12 0.45 0.05 0.50 0.11 K = non-ideal count RIO DE BAYAMON BASIN 50047990 RIO GUAYNABO NEAR BAYAMON, PR--Continued WATER-QUALITY DATA. WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 CHRO- GEN.AM- NITRO- BARIUM. BORON. CADMIUM MIUM. COPPER. MONIA • NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN. GEM, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (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 NO3) AS P) AS AS) AS BA) AS 8) AS CD) AS CR) AS CU) OCT 1988 <1 1 10 14... 0.7 1.3 5.8 0.24 1 <100 20 DEC 09... 0.7 1.5 6.6 0.26 FE8 1989 16... 0.6 1.2 5.3 0.26 APR 06... 0.4 1.0 4.4 0.22 1 100 30 1 3 10 JUN 02... 0.7 1.5 4.5 0.12 AUG 09... 0.6 1.1 4.9 0.18 METHY- KANGA- LENE IRON. LEAD. NESE. MERCURY SILVER. ZINC. 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- DATE (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) OCT 1988 <1 10 <0.01 3 0.06 14... 580 <5 30 0.1 <1 OEC 09... FEB 1989 16... APR <0.01 2 0.08 06... 1900 <5 540 <0.1 <1 1 20 JUN 02... AUG 09... 147 I I 148 RIO DE BAYAMON BASIN 50048510 RIO DE 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 fro bridge on High­ way 2, and 3.2 i (5.1 km) above mouth. DRAINAGE AREA.--71.9 mi? (186.2 km'). PERIOD OF 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 1988 TO SEPTEMBER 1989 015- OXYGEN. OXYGEN COLT- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL. FECAL. CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- 01S- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (MTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1988 07... 1415 58 408 7.90 27.0 20 8.3 103 17 4600 K820 DEC 12... 1320 54 358 7.80 26.0 5.1 8.8 108 .10 6000 K180 FEB 1989 07... 1545 47 407 8.40 26.5 9.0 11.1 135 <10 4100 K100 APR 07... 1350 20 395 8.00 28.0 27 9.4 118 <10 37000 K100 JUN 02... 1245 199 312 7.40 24.0 49 7.0 81 21 20000 6800 AUG 09... 1230 40 418 7.80 28.5 18 6.6 85 19 39000 3600 HARD- ALKA- HARD- NESS KAGNE- SODIUM ROTAS- UNITY CHLO- NESS NONCAR8 CALCIUM SLUM, SODIUM, AD- SLUM, MAT WH SULFATE RIDE. TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED T1ON SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1988 07... 150 7 39 13 24 0.9 3.6 150 <0.5 16 15 DEC 12... 130 FEB 1989 07... 150 APR 07... 150 0 39 12 21 0.8 2.7 140 <0.5 17 25 JUN 02... 100 AUG 09... 170 7 44 14 24 0.8 2.8 160 17 25 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS. TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- 01S- AT 105 GEN, GEN, GEN. GEN, GEM. DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE N020403 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENOED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 07... 0.2 24 240 37 48 0.48 0.02 0.50 0.04 0.46 DEC 12.. 12 0.49 0.01 0.50 0.05 0.25 FEB 1989 1... 17 0.31 0.03 0.40 0.05 0.35 APR 07... 0.2 26 231 12 66 0.47 0.03 0.50 0.05 0.25 JUN 2... 109 0.76 0.04 0.80 0.10 0.70 AUG 09... 0.2 28 252 27 83 0.35 0.05 0.40 0.17 0.33 K • non-ideal count 149 RIO DE BAYAMON BASIN 50048510 RIO DE BAYAMON AT FLOOD CHANNEL AT BAYAMON, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA t NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (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 NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1988 07... 0.5 1.0 4.4 0.10 2 200 30 1 20 10 DEC 12... 0.3 0.8 3.5 0.14 FEB 1989 07... 0.4 0.8 3.5 0.18 APR 07... 0.3 0.8 3.5 0.12 1 100 20 1 5 20 JUN 02... 0.8 1.6 7.1 0.11 AUG 09... 0.5 0.9 4.0 0.24 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- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1988 07... 2700 <5 310 <0.1 <1 1 20 <0.01 <1 0.11 DEC 12... FEB 1989 07... APR 07... 3400 <5 210 <0.1 <1 1 20 <0.01 <1 0.04 JUN 02... AUG 09... PESTICIDE ANALYSES CHLOR- DI- DI- ENDO- PCB, ALDRIN, DANE, DDD, DOE, DDT, AZINON, ELDRIN SULFAN, DATE 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) JUN 02... 1245 <0.1 <0.01 <0.1 <0.01 <0.01 <0.01 0.03 <0.01 ,0.01 HEPTA- METH- METHYL METHYL HEPTA- CHLOR MALA- OXY- PARA- TRI- ENDRIN, ETHION, CHLOR, EPDXIDE LINDANE THION, CHLOR, TH1ON, THION, MIREX, DATE 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) JUN 02... <0.01 <0.01 <0.01 <0.01 <0.01 0.01 <0.01 <0.01 <0.01 <0.01 NAPH- THA- LENES, PARA- POLY- PER- TOX- TOTAL THION, CHLOR. THANE APHENE, TR1- 2,4-D, 2,4,5-1 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) JUN 02... <0.01 <0.1 <0.1 <1 <0.01 0.01 <0.01 <0.01 <0.01 150 RIO PUERTO NUEVO BASIN 50048770 RIO PIEDRAS AT EL SENORIAL, PR LOCATION.--Lat 18°21'51", long 66°03'56", Hydrologic Unit 21010005, on right bank, in the Riberas del 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' (19.4 km 2 ). WATER-DISCHARGE RECORDS PERIOD OF RECORDS.--March 1988 to September 1989. 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 ft'/s (132 m'/s), Aug. 24, 1988, gage height, 16.08 ft (4.901 m), from rating curve extended above 200 ft'is (5.66 m 3/s) on basis of step-backwater analysis; minimum daily discharge, 2.1 ft'/s (0.06 mi/s), June 10, 1989. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,500 ft'is ( 42.5 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (m'/s) (ft) (m) Date Time (ft'/s) (m)/s) (ft) (m) June 3 1545 1,820 51.5 10.83 3.301 Sept. 18 1030 3,710 105 13.65 4.160 July 11 1630 *4,390 124 *14.42 4.395 Sept. 27 1515 2,230 63.2 11.56 3.523 Minimum daily discharge, 2.1 ft'is (0.059 m'/s), June 10. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 e13 14 7.9 5.4 7.1 11 26 22 50 7.7 4.7 11 2 e12 12 9.2 8.4 6.7 8.4 12 20 96 25 4.3 18 3 e15 10 9.6 5.1 6.6 7.6 12 6.5 249 11 8.0 16 4 e20 9.3 9.5 4.7 7.0 8.4 9.6 14 89 8.5 4.0 10 5 e12 14 8.4 4.9 7.1 6.4 7.5 6.6 13 7.6 23 9.9 6 e10 13 7.8 4.4 7.9 7.4 6.8 6.9 4.7 9.7 4.7 9.5 7 e9 0 12 8.7 7.6 5.9 7.3 6.3 11 3.1 41 26 65 8 e19 26 7.5 20 8.0 7.2 6.2 6.0 3.4 18 5.6 58 9 e12 15 9.9 16 e16 6.4 6.2 7.4 2.3 12 3.7 15 10 e30 13 7.8 18 e6.4 34 6.6 6.0 2.1 9.0 44 100 11 11 27 7.5 60 e6.0 6.9 6.0 6.7 20 331 12 54 12 9.0 65 6.7 36 e5.6 38 6.1 5.3 8.3 34 7.1 21 13 7.6 98 7.7 21 e5.6 47 13 5.6 9.7 95 9.7 26 14 8.3 67 8.5 10 e5.4 12 11 4.9 8.2 20 6.4 18 15 8.2 30 10 8.1 e18 10 6.0 4.8 7.8 6.2 27 50 16 7.8 21 9.1 8.7 e88 9.2 6.4 4.8 7.4 5.2 14 38 17 8.9 120 22 8.4 63 11 6.1 4.8 66 7.0 63 43 18 8.9 32 9.4 7.2 32 11 5.2 4.8 15 63 54 610 19 28 16 7.9 7.9 9.6 6.6 5.2 5.3 7.6 7.9 65 39 20 15 14 6.8 25 7.9 6.8 5.1 6.1 6.3 6.5 44 33 21 11 19 5.9 11 7.1 6.7 5.2 5.8 7.0 7.2 33 51 22 9.2 10 20 7.9 7.1 7.1 5.0 5.3 12 9.0 15 17 23 7.3 9.2 9.1 7.4 5.1 7.3 4.4 6.1 7.2 8.4 27 88 24 5.1 7.9 39 7.4 5.0 9.9 4.2 5.4 7.3 4.6 23 78 25 32 10 11 11 5.3 12 4.1 3.6 7.6 4.8 113 18 26 35 11 9.7 8.2 84 16 4.2 3.8 7.3 5.8 23 13 27 7.0 8.1 6.3 7.4 47 41 3.6 6.9 5.8 32 39 154 28 8.6 7.1 11 6.8 11 11 102 2.7 6.8 6.3 10 31 29 21 7.0 6.8 7.5 --- 8.8 55 9.8 7.5 4.0 97 17 30 16 7.3 33 7.6 9.3 10 4.0 7.5 5.8 26 75 31 12 --- 8.7 7.4 10 --- 69 --- 9.9 12 --- TOTAL 428.9 724.9 342.4 376.4 491.4 401.7 367.0 281.9 744.9 823.1 848.2 1786.4 MEAN 13.8 24.2 11.0 12.1 17.5 13.0 12.2 9.09 24.8 26.6 27.4 59.5 MAX 35 120 39 60 BB 47 102 69 249 331 113 610 MIN 5.1 7.0 5.9 4.4 5.0 6.4 3.6 2.7 2.1 4.0 3.7 9.5 AC-FT 851 1440 679 747 975 797 728 559 1480 1630 1680 3540 CFSM 1.85 3.23 1.47 1.62 2.34 1.73 1.63 1.21 3.32 3.54 3.65 7.95 IN. 2.13 3.60 1.70 1.87 2.44 2.00 1.82 1.40 3.70 4.09 4.21 8.87 WTR YR 1989 TOTAL 7617.2 MEAN 20.9 MAX 610 MIN 2.1 AC-FT 15110 CFSM 2.79 IN. 37.83 e Estimated 151 RIO PUERTO NUEVO BASIN 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 116, and 2.5 mi (4.0 km) southwest of Rio Piedras plaza. DRAINAGE AREA.--8.17 mil (20.9 km 2 ). PERIOD OF RECORD.--Water years 1972 to current year. WATER QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1988 26... 0900 14 312 7.70 23.0 65 8.3 96 13 24000 9800 DEC 08... 1225 11 374 7.30 24.5 23 7.8 93 20 K130000 K110000 FEB 1989 17... 1030 39 242 6.80 22.5 290 8.4 96 19 49000 K130000 APR 20... 1105 7.0 430 8.00 25.5 4.6 9.2 112 43 K130000 66000 JUN 12... 0905 9.7 406 7.40 25.5 15 6.9 84 20 250000 K180000 AUG 08... 1120 11 357 1.70 28.0 43 4.5 57 22 K160000 30000 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SLUM, SODIUM, AD- S1UM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS CAC03) MG/L AS CAC03 (MG/L AS CA) (MG/L AS MG) (MG/L AS NA) RATIO (MG/L AS K) MG/L AS CAC03 (MG/L AS S) (MG/L AS SO4) (MG/L AS CL) OCT 1988 26... 110 3 27 10 18 0.8 2.9 110 <0.5 16 20 DEC 08... 130 FEB 19 17... 71 APR 20... 150 3 38 13 27 1 2.8 140 <0.5 15 27 JUN 12... 150 AUG 08... 120 31 11 23 0.9 2.9 120 16 22 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEM, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L 015- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 26... 0.1 24 182 6.9 52 0.68 0.02 0.70 0.13 0.57 DEC 08... 43 0.78 0.12 0.90 1.80 1.40 FEB 1989 17... 320 0.55 0.05 0.60 0.15 1.0 APR 20... 0.2 31 242 4.5 13 0.62 0.08 0.70 0.63 0.57 JUN 12... 25 0.64 0.06 0.70 1.70 0.80 AUG 08.... 0.3 27 206 6.2 49 0.65 0.05 0.70 0.42 0.98 K • non-ideal count 152 RIO PUERTO NUEVO BASIN 50048800 RIO PIEDRAS NEAR RIO PIEDRAS, PR--Continued WATER QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (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 NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1988 26... 0.7 1.4 6.2 0.08 1 <100 50 1 2 <10 DEC 08... 3.2 4.1 18 0.80 FEB 1989 17... 1.2 1.8 8.0 0.34 APR 20... 1.2 1.9 8.4 0.44 1 200 60 <1 <1 10 JUN 12... 2.5 3.2 14 0.32 AUG 08... 1.4 2.1 9.3 0.07 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- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1988 26... 4000 <5 130 <0.1 <1 <1 10 <0.01 1 0.02 DEC 08... FEB 1989 17... APR 20... 670 <5 140 0.1 <1 <1 <10 <0.01 <1 0.55 JUN 12... AUG 08... PESTICIDE ANALYSES CHLOR- DI- DI- ENDO- PCB, ALDRIN, DANE. DOD, DOE. DOT, AZINON, ELDRIN SULFAN, DATE 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) JUN 12... 0905 <0.1 <0.01 <0.1 <0.01 <0.01 <0.01 0.03 <0.01 <0.01 HEPTA- METH- METHYL METHYL HEPTA- CHLOR MALA- OXY- PARA- TRI- ENDRIN, ETHION, CHLOR, EPDXIDE LINDANE THION, CHLOR, THION, THION, MIREX, DATE 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) JUN 12... <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 NAPH- THA- LENES, PARA- POLY- PER- TOX- TOTAL THION, CHLOR. THANE APHENE, TRI- 2,4-0, 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) JUN 12... <0.01 <0.1 <0.1 <1 <0.01 <0.01 <0.01 <0.01 <0.01 153 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. DRAINAGE AREA.--12.5 mil (32.4 ke). 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.--13 years (1972-82,1988-89), 29.3 ft'/s (0.83 m'/s), 31.83 in/yr (808 mm/yr), 21,230 acre-ft/yr (26.2 he/yr); median of yearly mean discharges, 26 ft'/s (0.74 e/s), 18,800 acre-ft/yr (23.2 he/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge 10,000 fti/s (283 e/s), Dec. 11, 1975, gage height, 21.02 ft (6.407 m), from rating curve extended above 3,000 ft'/s (85.0 m'/s) on basis of slope-area measurements; minimum daily discharge, 0.26 ft'is (0.007 m 3/s), May 19, 1977. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 2,800 ft3/s (79.3 e/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft3/s) (m3/s) (ft) (m) Date Time (ft3/s) (m 3/s) (ft) (m) Apr. 28 1615 2,910 82.4 8.95 2.728 Sept. 18 1115 *8,750 248 *16.04 4.890 June 3 1115 4,570 129 11.33 3.453 Sept. 27 1600 3,060 86.6 9.19 2.801 July 11 1715 5,790 164 12.83 3.910 Minimum discharge, 4.1 ft3/s (0.12 e/s), June 20. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 25 26 25 14 16 13 e44 e40 83 7.4 36 16 2 24 17 25 18 13 10 e21 26 215 65 33 24 3 27 16 30 12 11 10 e20 14 890 7.5 48 20 4 33 14 26 11 12 13 e16 19 202 6.0 36 15 5 22 15 25 12 13 14 13 18 30 5.6 80 15 6 18 16 24 13 17 26 27 14 12 36 40 14 7 16 14 28 14 10 17 11 31 10 116 61 117 8 32 39 23 48 30 15 8.4 17 10 35 37 69 9 19 23 31 26 31 21 8.2 14 9 8 24 33 87 10 58 17 21 34 8.6 64 11 12 11 21 80 232 11 18 28 19 93 8.3 22 8.2 12 89 549 68 40 12 19 18 16 42 6.2 79 9.3 10 12 37 49 13 13 18 149 14 30 6.3 77 15 10 13 159 96 13 14 20 63 13 15 11 24 19 8.0 13 35 58 20 15 20 31 21 12 34 14 8.9 7.2 12 21 109 35 16 16 27 19 11 142 14 8.5 7.0 12 20 82 21 17 17 188 44 8.5 95 23 8.5 7.4 85 23 156 19 18 17 39 15 8.0 46 21 8.2 7.6 8.4 103 95 1580 19 52 29 13 8.5 17 ell 8.6 6.8 4.7 23 101 47 20 20 32 14 43 13 ell 8.9 6.7 4.6 16 153 102 21 22 51 15 21 11 e12 8.9 6.9 6.0 16 103 64 22 33 44 59 14 12 e13 8.6 6.7 7.9 28 48 21 23 35 35 40 13 14 e15 8.4 6.7 5.2 30 65 165 24 27 33 69 13 10 e19 7.5 7.2 5.0 19 114 144 25 74 31 24 17 10 e23 7.2 7.3 6.0 18 221 20 26 106 25 21 14 90 e36 8.0 43 6.7 17 32 17 27 32 27 15 12 88 e70 6.9 23 7.5 119 93 256 28 40 22 34 12 17 e18 325 23 7.1 37 27 42 29 49 26 19 15 --- e15 e100 24 6.9 32 343 21 30 45 27 64 15 e16 e23 34 6.3 32 38 97 31 70 --- 23 15 e31 --- 200 --- 65 19 --- TOTAL 1024 1122 829 634.0 792.4 767 786.2 669.5 1791.1 1722.5 2554 3346 MEAN 33.0 37.4 26.7 20.5 28.3 24.7 26.2 21.6 59.7 55.6 82.4 112 MAX 106 188 69 93 142 79 325 200 890 549 343 1580 MIN 16 14 13 8.0 6.2 10 6.9 6.7 4.6 5.6 19 13 AC-FT 2030 2230 1640 1260 1570 1520 1560 1330 3550 3420 5070 6640 CFSM 2.64 2.99 2.14 1.64 2.26 1.98 2.10 1.73 4.78 4.45 6.59 8.92 IN. 3.05 3.34 2.47 1.89 2.36 2.28 2.34 1.99 5.33 5.13 7.60 9.96 CAL YR 1988 TOTAL 14110 MEAN 38.6 MAX 885 MIN 10 AC-FT 27990 CFSM 3.08 IN. 41.99 WTR YR 1989 TOTAL 16037.7 MEAN 43.9 MAX 1580 MIN 4.6 AC-FT 31810 CFSM 3.52 IN. 47.73 e Estimated 154 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 Piniero at Expreso Las Americas, and 0.8 mi (1.3 km) southwest of Hato Rey. DRAINAGE AREA.--15.4 mil (39.9 km 2 ). PERIOD OF RECORD.--Water years 1971 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 DIS- OXYGEN, OXYGEN COLI- STREP­ CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1988 26... 1200 22 340 7.90 25.0 47 7.6 91 20 K91000 28000 DEC 14... 1220 16 475 7.10 26.0 170 2.5 30 <10 54000 360000 FEB 1989 27... 1300 107 215 6.90 25.0 440 7.5 89 22 K100000 92000 APR 20... 1210 13 461 8.40 26.5 3.4 6.3 78 50 K93000 36000 JUN 12... 1115 24 451 7.30 27.0 75 5.0 60 22 K750000 K110000 AUG 09... 0750 16 417 7.60 26.5 8.2 4.3 52 490 K61000 7200 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SIUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- 01S- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1988 26... 120 1 31 10 21 0.9 3.4 120 <0.5 16 22 DEC 14... 170 FEB 1989 27... 70 APR 20... 160 0 44 12 31 1 3.4 170 <0.5 14 31 JUN 12... 170 AUG 09... 150 0 41 12 26 1 2.9 110 15 25 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIOE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 26... 0.1 23 197 12 60 0.72 0.08 0.80 0.63 0.37 DEC 14... 18 0.62 0.18 0.80 4.00 1.4 FEB 1989 27... 674 0.53 0.07 0.60 0.25 1.5 APR 20... 0.2 28 260 9.4 8 0.49 0.11 0.60 1.80 1.1 JUN 12... 16 0.69 0.11 0.80 1.60 1.4 AUG 09... 0.2 28 244 11 22 0.64 0.06 0.70 0.40 0,50 K . non-ideal count RIO PUERTO NUEVO BASIN 50049100 RIO PIEDRAS AT NATO REY, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (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 NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1988 26... 1.0 1.8 8.0 0.21 1 300 50 <1 3 10 DEC 14... 5.4 6.2 27 1.40 FEB 1989 27... 1.8 2.4 11 0.39 APR 20... 2.9 3.5 15 0.75 1 200 60 <1 <1 20 JUN 12... 3.0 3.8 17 0.44 AUG 09... 0.9 1.6 7.1 0.21 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- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) MANGA- OCT 1988 26... 4600 <5 200 0.1 <1 <1 10 <0.01 1 0.04 DEC 14... FEB 1989 27... APR 20... 390 <5 140 0.2 <1 <1 10 <0.01 2 1.5 JUN 12... AUG 09... 155 156 RIO PUERTO NUEVO BASIN 50049310 QUEBRADA JOSEFINA AT PINERO AVENUE 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 mil (49.2 km 2 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--February 1988 to September 1989. 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 ft3/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 m,/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (m0/s) (ft) (m) Date Time (ft'/s) (m'/s) (ft) (m) June 2 1400 1,890 53.5 5.94 1.810 Aug. 29 1100 2,040 57.8 6.14 1.871 June 3 0930 2,170 61.4 6.32 1.926 Sept. 9 1400 2,140 60.6 6.28 1.914 June 11 0245 1,990 56.4 6.08 1.853 Sept. 18 1030 *4,320 122 *8.69 2.649 Minimum discharge, 0.82 fts/s (0.02 mu/s), May 27. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 11 2.9 2.9 3.0 3.6 2.5 8.6 6.6 27 5.6 7.3 13 2 7.4 3.1 2.7 3.4 3.0 2.7 6.9 2.9 172 19 9.5 17 3 9.2 3.1 7.2 4.7 3.0 3.0 11 4.2 226 2.8 20 15 4 30 3.3 3.7 4.3 4.5 2.8 12 3.9 56 4.0 5.2 12 5 5.1 3.4 3.7 2.8 3.1 2.9 8.5 9.3 3.8 2.4 9.2 13 6 5.5 9.1 3.7 4.1 6.7 11 6.9 5.2 2.3 10 7.6 8.1 7 3.7 4.8 10 3.6 2.6 2.1 3.5 21 2.3 24 11 13 8 38 23 4.3 26 8.7 1.8 4.3 2.5 3.4 3.6 3.2 22 9 2.5 3.9 10 5.7 10 8.8 5.0 2.8 3.9 3.5 5.7 61 10 3.8 4.5 9.0 24 2.9 5.9 6.9 2.5 5.3 4.1 27 41 11 4.4 4.0 5.8 51 4.6 2.3 4.9 2.8 61 18 5.1 16 12 8.5 7.3 5.0 37 1.8 21 5.7 3.6 2.7 2.9 4.5 17 13 5.1 60 5.2 9.8 2.2 19 11 4.3 3.5 47 17 18 14 7.5 4.9 3.1 8.6 2.1 10 9.1 4.4 4.1 14 5.8 37 15 5.3 4.8 5.8 11 20 4.6 4.6 4.2 3.9 4.7 25 9.2 16 3.3 14 4.3 17 59 9.4 3.7 3.8 3.4 4.4 6.0 27 17 3.7 23 15 7.1 21 5.0 5.0 3.7 4.0 7.5 57 17 18 2.6 6.3 5.7 9.0 9.5 9.9 7.0 3.6 12 19 28 664 19 15 5.7 3.5 11 4.2 4.5 5.4 3.4 2.1 10 26 19 20 3.6 5.6 9.3 20 4.5 7.6 6.7 4.0 1.9 3.4 51 27 21 5.6 14 9.6 6.5 4.9 4.9 6.6 4.5 4.6 3.3 9.9 16 22 9.9 12 22 5.8 2.2 4.5 6.5 4.0 3.0 18 10 20 23 7.1 3.1 9.5 5.4 6.5 4.5 5.3 2.8 7.2 14 25 56 24 5.7 2.6 26 9.6 4.1 5.7 4.1 2.6 2.8 4.3 36 30 25 16 5.1 12 4.7 3.5 6.3 4.4 2.2 3.2 5.4 37 23 26 6.3 9.4 9.2 5.6 26 3.0 3.4 14 2.9 3.9 9.7 24 27 4.2 3.4 5.1 6.1 41 4.4 3.6 2.3 3.7 24 57 26 28 13 2.4 23 6.6 2.6 4.5 53 8.9 3.2 4.1 9.5 44 29 15 2.7 5.7 9.1 --- 6.0 96 2.1 3.1 5.2 107 20 30 4.2 2.8 7.6 4.6 7.8 7.4 27 3.1 7.5 15 22 31 6.1 --- 4.0 9.9 15 --- 76 --- 17 15 TOTAL 268.3 254.2 253.6 337.0 267.8 203.4 327.0 245.1 637.4 316.6 662.2 1347.3 MEAN 8.65 8.47 8.18 10.9 9.56 6.56 10.9 7.91 21.2 10.2 21.4 44.9 MAX 38 60 26 51 59 21 96 76 226 47 107 664 MIN 2.5 2.4 2.7 2.8 1.8 1.8 3.4 2.1 1.9 2.4 3.2 8.1 AC-FT 532 504 503 668 531 403 649 486 1260 628 1310 2670 CFSM .46 .45 .43 .57 .50 .35 .57 .42 1.12 .54 1.12 2.36 IN. .53 .50 .50 .66 .52 .40 .64 .48 1.25 .62 1.30 2.64 WTR YR 1989 TOTAL 5119.9 MEAN 14.0 MAX 664 MIN 1.8 AC-FT 10160 CFSM .74 IN. 10.02 157 RIO PUERTO NUEVO BASIN 50049820 LAGUNA 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 km) east of Caho de Martin Pena, 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 1988 TO SEPTEMBER 1989 DEPTH OXYGEN, COLI- STREP- ALKA- AT SPE- TRANS- DIS- FORM, TOCOCCI LINITY SAMPLE CIFIC PAR- SOLVED FECAL, FECAL, WAT WH LOC- CON- PH TEMPER- ENCY OXYGEN, (PER- 0.7 KF AGAR TOT FET ATION, DUCT- (STAND- ATURE (SECCHI DIS- CENT UM-MF (COLS. FIELD DATE TIME TOTAL ANCE ARD WATER DISK) SOLVED SATUR- (COLS./ PER MG/L AS (FEET) (US/CM) UNITS) (DEG C) (IN) (MG/L) ATION) 100 ML) 100 ML) CAC03 OCT 1988 20... 1015 1.00 17000 8.10 29.5 8.4 15.1 197 K1700 K400 120 DEC 22... 1030 1.00 17800 7.80 25.5 16 5.4 65 K120000 32000 120 FEB 1989 27... 1005 1.00 12500 8.50 27.0 8.8 12.8 157 K82000 6500 81 APR 25... 0905 1.00 25000 8.40 28.0 15 0.8 10 45000 4000 110 JUN 22... 0945 1.00 22600 9.00 27.0 9.2 6.4 80 3000 K100 120 AUG 30... 1045 1.00 13000 8.40 29.0 12.0 4.2 54 45000 K1400 94 RESIDUE NITRO- TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- GEN,AM- AT 105 GEN, GEN, GEN, GEN, GEN, MONIA + NITRO- NITRO- PHOS- CARBON, DEG. C. NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, GEN, PHOROUS ORGANIC SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL DATE PENDED (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) AS NO3) AS P) AS C) OCT 1988 20... 5 <0.01 <0.10 0.03 4.0 4.0 0.20 19 DEC 22... 36 0.08 0.02 0.10 2.10 3.5 5.6 5.7 25 0.70 17 FEB 1989 27... 48 0.09 0.01 0.10 0.16 <0.2 0.24 9.2 APR 25... 47 0.04 <0.10 2.40 12 14 0.92 35 JUN 22... 28 <0.01 <0.10 0.12 1.2 1.3 0.34 AUG 30... 13 0.05 0.05 0.10 0.64 2.1 2.7 0.17 13 K - non-ideal count RIO PUERTO NUEVO BASIN 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 (0.6 km) west of Puente de la Constitucion, and 0.5 mi (0.8 km) south from U.S. Naval Reservation. DRAINAGE--Indeterminate. PERIOD OF RECORD--Water years 1974 to present. WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 DEPTH OXYGEN, COLI- STREP- ALKA- AT SPE- TRANS- DIS- FORM, TOCOCCI LINITY SAMPLE CIFIC PAR- SOLVED FECAL, FECAL, WAT WH LOC- CON- PH TEMPER- ENCY OXYGEN, (PER- 0.1 KF AGAR TOT FET ATION, DUCT- (STAND- ATURE (SECCHI DIS- CENT UM-MF (COLS. FIELD DATE TIME TOTAL ANCE ARD WATER DISK) SOLVED SATUR- (COLS./ PER MG/L AS (FEET) (US/CM) UNITS) (DEG C) (IN) (MG/L) ATION) 100 ML) 100 ML) CAC03 OCT 1988 20... 1140 1.00 8300 7.10 29.0 6 3.4 44 K150000 6600 120 DEC 22... 1155 1,00 16600 7.50 25.5 18 2.4 30 K140000 38000 150 FEB 1989 27... 1105 1.00 4180 7.10 24.0 2 7.0 81 41000 53000 59 APR 25... 1100 1.00 44000 7.40 28.0 25 7.0 89 K73000 4900 140 JUN 22... 1145 1.00 32400 7.80 28.0 5.6 76 530000 K1700 140 AUG 30... 1245 1.00 >50000 7.40 29.5 3 3.3 43 K100000 36000 120 RESIDUE NITRO- TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- GEN,AM- AT 105 GEN, GEN, GEN, GEN, GEN, MONIA , NITRO- NITRO- PHOS- CARBON, DEG. C, NITRATE NITRITE N020403 AMMONIA ORGANIC ORGANIC GEN, GEN, PHOROUS ORGANIC SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL DATE PENDED (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) AS NO3) AS P) AS C) OCT 1988 20... 38 0.35 0.05 0.40 0.93 0.87 1.8 2.2 9.7 0.15 6.0 DEC 22... 22 0.08 0.02 0.10 1.40 1.6 3.0 3.1 14 0.46 9.9 FEB 1989 27... 330 0.47 0.03 0.50 0.39 1.5 1.9 2.4 11 0.20 7.1 APR 25... 12 0.06 0.04 0.10 2.20 0.7 2.9 0.48 8.6 JUN 22... 35 0.06 0.04 0.10 1.30 1.5 2.8 2.9 13 0.47 9.2 AUG 30... 1 0.43 0.07 0.50 0.50 0.8 1.3 0,14 8.2 K = non-ideal count 158 159 SAN JUAN E A N LOIZA ALET:E';'"--\ Coastal basin Coastal bass L RIO GRANDE R TRUJI 0 ALTO R/i, Herrera basin Rio ESP(rltu Santo basal Logo Lotio AGUAS BUENAS 05 057.25 • •5 50 0550 E CAGUAS JUNCOS 053 —Drainage boundary 051150 -4 0 1310 .A0509 SURFACE-WATER STATION AND NUMBERS V0554 QUALITY--OF-WATER STATION AND NUMBER Rio Grande V0588 QUALITY-OF-WATER de PatitIos basin PARTIAL RECORD STATION AND NUMBER Rio Guayana* basin • 222 WELL AND WELL NUMBER .A60110ILLA •ARECISO 110590 LAKE-ELEVATION STATION ISAMOUU CAS1JA4 PONC E GUAM.. Figure 19.--Rio Grande de Loiza basin. I I I 160 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 i (2.3 km) south of Valle Arriba Heights housing area, and 1.2 i (1.9 km) west-southwest of Carolina plaza. DRAINAGE AREA.--2.96 i, (7.67 km2 ). PERIOD OF RECORD.--Water years 1973 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 DIS- OXYGEN, OXYGEN COLT- STREP- CHARGE, SPE- DIS- DEMAND. FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1988 03... 1305 5.2 540 7.60 30.0 15 3.2 42 28 31000 K600 DEC 07... 1145 11 360 6.80 25.0 72 3.3 40 26 370000 360000 FEB 1989 13... 1115 7.4 435 7.00 24.5 26 4.5 53 40 60000 120000 APR 14... 1240 19 412 7.20 26.0 160 5.4 65 <10 330000 48000 JUN 02... 1045 48 506 6.70 25.5 90 6.1 73 85 310000 260000 AUG 04... 1135 12 437 7.40 28.0 13 4.0 51 33 K610000 720000 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SLUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1988 03... 80 0 18 7.8 23 1 2.4 170 <0.5 15 23 DEC 07... 120 FEB 1989 13... 150 APR 14... 130 0 41 7.8 25 1 2.3 140 <0.5 23 29 JUN 02... 120 AUG 04... 130 0 39 8.3 24 0.9 3.2 150 18 29 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C. NITRATE NITRITE NO20403 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) 5102) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 03... 0.1 32 170 2.4 22 0.82 0.08 0.90 0.52 0.78 DEC 07... 124 0.70 0.10 0.80 1.40 2.1 FEB 1989 13... 48 0.70 0.10 0.80 1.20 2.4 APR 14... 0.1 21 230 12 228 0.71 0.09 0.80 0.25 2.1 JUN 02... 177 0.40 0.10 0.50 0.38 0.42 AUG 04... 0.1 24 230 7.3 16 0.53 0.17 0.70 1.20 2.0 K = non-ideal count RIO GRANDE DE LOIZA BASIN 50050300 QUEBRADA BLASINA NEAR CAROLINA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (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 NO3) AS P) AS AS) AS BA) AS 8) AS CD) AS CR) AS CU) OCT 1988 03... 1.3 2.2 9.7 0.31 1 200 50 <1 14 50 DEC 07... 3.5 4.3 19 0.70 FEB 1989 13... 3.6 4.4 19 0.68 APR 14... 2.3 3.1 14 0.29 2 100 70 <1 13 30 JUN 02... 0.8 1.3 5.8 0.28 AUG 04... 3.2 3.9 17 0.36 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- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1988 03... 940 1 260 0.1 <1 <1 20 <0.01 3 0.15 DEC 07... FEB 1989 13... APR 14... 410 13 930 0.2 <1 <1 60 <0.01 <1 0.08 JUN 02... AUG 04... 161 I I I I I I 162 RIO GRANDE DE LOIZA BASIN 50050900 RIO GRANDE DE LOIZA AT QUEBRADA ARENAS, PR LOCATION.--Lat 18°07'10", long 65°59'22", Hydrologic Unit 21010005, at intersection of Highways 181 and 9990. 0.2 i (0.3 km) upstream fro confluence with Rio Emajagua and about 7.1 mi (11.4 km) southwest of San Lorenzo. DRAINAGE AREA.--6.00 i 2 (15.54 km2 ). 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.--12 years (1978-89), 31.2 ft'/s (0.884 m'/s), 70.62 in/yr, (1,794 mm/yr), 22,600 acre-ft/yr (27.9 hol0/yr); median of yearly mean discharges, 29 ft'/s (0.82 '/s), 21,000 acre-ft/yr (26 hm'/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 11,700 ft'/s (331 m'/s), Nov. 5, 1983, gage height, 14.78 ft (4.505 m), from rating curve extended above 500 ft'is (14.2 '/s) on basis of step-backwater analysis; minimum discharge, 2.8 ft'is (0.079 m'/s), May 5, 6, 1979. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 2,000 ft'/s (56.6 ml/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (10/s) (ft) (m) Date Time (ft'/s) (m 3/s) (ft) (m) Nov. 17 0230 2,230 63.2 8.47 2.582 Sept. 18 0900 *3,470 98.3 *9.69 2.954 Feb. 17 0245 2,300 65.1 8.54 2.603 Sept. 23 2145 3,440 97.4 9.66 2.944 Minimum discharge, 8.3 ft'is (0.235 '/s), May 22-26. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 14 17 19 17 13 15 e50 13 34 9.9 ell e15 2 17 36 18 16 12 14 e25 16 88 105 e10 e14 3 41 19 18 14 12 18 e17 14 55 21 ell e14 4 92 18 17 14 12 21 e14 19 27 12 e22 e12 5 23 19 18 14 11 17 e12 17 21 e25 e34 ell 6 22 19 16 13 13 22 ell 37 18 e21 e12 ell 7 48 24 15 19 12 24 ell 34 16 e25 e9,4 e10 8 24 30 15 14 14 23 e45 16 15 e21 e10 e9.8 9 22 23 15 14 13 36 e20 el2 15 e18 e9.5 e15 10 20 20 15 15 12 232 e30 e9.0 14 e15 e9.7 e34 11 18 37 15 21 12 32 e21 11 14 e16 e20 e27 12 30 23 14 32 12 e25 e25 11 14 e22 e23 e25 13 29 24 14 27 11 e60 e20 11 13 e15 e29 e16 14 20 31 13 16 12 e40 14 10 13 e14 e13 32 15 42 24 13 15 14 e30 13 10 12 e13 e12 45 16 31 133 13 14 26 e25 16 9.8 12 e12 ell 33 17 37 398 37 17 298 e20 16 9.4 15 e13 e20 28 18 25 64 17 19 91 e17 14 9.3 13 e14 e40 725 19 22 35 15 16 23 e15 13 9.2 12 e13 e100 80 20 74 28 14 16 19 e14 13 8.9 12 e12 e21 37 21 59 24 13 42 19 e14 12 8.9 11 e12 ell 69 22 31 23 13 18 17 e45 15 8.8 11 e12 e14 164 23 38 22 15 16 18 e35 12 8.5 12 e53 e35 382 24 28 20 24 15 18 e22 12 8.8 11 e14 e21 156 25 25 38 39 14 20 ell 12 8.7 11 e15 e14 68 26 23 93 19 16 52 e15 11 17 10 e17 e12 46 27 21 26 16 14 19 e14 10 85 9.7 e27 e39 32 28 20 21 15 13 16 e13 10 38 9.6 e40 e16 37 29 22 20 42 14 --- e20 11 17 11 e19 eli 36 30 21 19 49 14 e50 12 63 9.3 eli e26 24 31 19 --- 19 12 e80 --- 102 --- ell e17 TOTAL 958 1328 595 531 821 1025 517 652.3 538.6 647.9 649.6 2207.8 MEAN 30.9 44.3 19.2 17.1 29.3 33.1 17.2 21.0 18.0 20.9 21.0 73.6 MAX 92 398 49 42 298 232 50 102 88 105 100 725 MIN 14 17 13 12 11 13 10 8.5 9.3 9.9 9.4 9.8 AC-FT 1900 2630 1180 1050 1630 2030 1030 1290 1070 1290 1290 4380 CFSM 5.15 7.38 3.20 2.85 4.89 5.51 2.87 3.51 2.99 3.48 3.49 12.3 IN. 5.94 8.23 3.69 3.29 5.09 6.35 3.21 4.04 3.34 4.02 4.03 13.69 CAL YR 1988 TOTAL 11453.2 MEAN 31.3 MAX 892 MIN 4.6 AC-FT 22720 CFSM 5.22 IN. 71.01 WTR YR 1989 TOTAL 10471.2 MEAN 28.7 MAX 725 MIN 8.5 AC-FT 20770 CFSM 4.78 IN. 64.92 e Estimated 163 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- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) OCT, 06 1142 21 139 26.0 APR, 05 1357 13 137 27.0 NOV, 09 0936 26 135 23.5 MAY, 09 1504 13 141 28.0 DEC, 09 1018 15 197 21.0 JUN, 12 1357 13 147 26.0 JAN, 03 -- 14 146 -- JUL, 03 1250 16 117 28.5 FEB, 02 1220 12 152 23.5 AUG, 15 1407 12 141 29.0 , MAR, 09 0945 126 109 21.5 I I I I 164 RIO GRANDE DE LOIZA BASIN 50050900 RIO GRANDE DE LOIZA AT QUEBRADA ARENAS WATER-QUALITY RECORDS PERIOD OF RECORD.-- Water years 1985 to 1986. PERIOD OF DAILY RECORD.-- SUSPENDED-SEDIMENT DISCHARGE: October 1984 to September 1986. REMARKS.-- The suspended-sediment data included in this report is part of a 5-year hydrologic investigation conducted in the Rio Grande de Loiza Basin to account the amount of suspended- sediment transported to Lago Loiza, a water supply reservoir. EXTREMES FOR PERIOD OF DAILY RECORD.-- SEDIMENT CONCENTRATION: Maximum daily mean. 2.570 g/L May 17. 1985; Minimum daily mean, 0 g/L several days. SEDIMENT LOADS: Maximum daily mean. 14.060 tons (12.800 tonnes) May 17, 1985; Minimum daily mean, 0.00 tons (0.00 tonne) several days. EXTREMES FOR WATER YEARS 1984-86.-- SEDIMENT CONCENTRATION: Maximum daily mean. 2,140 g/L October 6. 1985; Minimum daily mean, 1 g/L (several days). SEDIMENT LOADS: Maximum daily. 14,100 tons (12.700 tonnes) May 18. 1985; Minimum daily mean, 0.02 ton (0.02 tonne) several days. Water suspeneded-sediment concentration (mg/L) suspended-sediment discharge (tons per day) Year maximum minimum maximum minimum 1985 1.910 (May 18) 1 (several days) 14.100 (May 18) 0.02 (several days) 1986 2.140 (Oct. 06) 1 (several days) 9,930 (Oct. 06) 0.02 (several days) SEDIMENT DISCHARGE. SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 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 NOVEMBER DECEMBER 1 21 22 1.2 147 413 566 20 5 .27 2 25 22 1.5 126 238 153 61 114 87 3 28 25 1.9 648 1310 5290 26 15 1.1 4 22 22 1.3 227 452 358 21 8 .45 5 49 122 106 463 1200 3760 20 5 .27 6 29 30 2.3 449 811 1710 19 4 .21 7 34 40 3.7 212 417 443 18 4 .19 8 26 25 1.8 105 40 11 18 3 .15 9 245 587 3030 82 28 6.2 19 3 .15 10 71 111 28 66 25 4.5 17 3 .14 21 3.1 17 3 .14 12 27 30 2.2 47 20 2.5 17 3 .14 13 50 85 26 44 15 1.8 16 3 .13 14 114 299 408 60 18 2.0 15 11 35 40 3.8 55 4 .16 15 50 68 13 46 25 3.1 15 5 .20 16 35 42 4.0 37 18 1.8 15 5 .20 17 28 35 2.6 34 12 1.1 15 3 .12 18 26 28 2.0 31 10 .84 14 2 .08 19 25 28 1.9 30 9 .73 14 2 .08 20 23 25 1.6 28 6 .45 14 1 .04 21 23 21 1.3 28 6 .45 12 1 .03 22 22 21 1.2 28 9 .68 12 1 .03 23 21 20 1.1 32 11 .95 12 2 .06 24 20 19 1.0 29 11 .86 3 14 .11 25 40 61 12 52 60 30 18 20 .97 .11 27 32 40 3.5 25 20 1.4 2 26 72 124 53 46 59 14 13 3 14 .08 28 32 40 3.5 23 13 .81 13 2 .07 29 29 35 2.7 22 9 .53 12 2 .06 30 23 12 .75 21 5 .28 15 5 .20 31 21 12 .68 --- --- --- 12 3 .10 TOTAL 1298 3723.53 3243 12369.08 538 93.04 RIO GRANDE OE LOIZA BASIN 165 50050900 RIO GRANDE DE LOIZA AT QUEBRADA ARENAS, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 DAY MEAN DISCHARGE (CFS) MEAN CONCEN- TRATION (MG/L) SEDIMENT DISCHARGE (TONS/DAY) MEAN DISCHARGE (CFS) MEAN CONCEN- TRATION (MG/L) SEDIMENT DISCHARGE (TONS/DAY) MEAN DISCHARGE (CFS) MEAN CONCEN- TRATION (MG/L) SEDIMENT DISCHARGE (TONS/DAY) JANUARY FEBRUARY MARCH 1 2 3 4 5 11 16 12 25 13 3 10 3 15 5 .09 .43 .10 1.0 .18 8.6 8.1 8.0 7.7 7.8 1 1 1 1 1 .02 .02 .02 .02 .02 17 14 16 13 12 8 7 8 9 9 .37 .26 .35 .32 .29 6 7 8 9 10 15 12 11 10 11 5 3 2 1 2 .20 .10 .06 .03 .06 7.8 8.0 8.0 7.8 7.8 2 2 1 1 1 .04 .04 .02 .02 .02 21 53 32 20 16 25 40 10 8 5 1.4 5.7 .86 .04 .22 11 12 13 14 15 11 9.8 9.3 9.3 9.2 1 2 2 2 1 .03 .05 .05 .05 .02 7.8 7.8 8.3 8.5 11 1 1 2 2 2 .02 .02 .04 .05 .06 15 15 14 14 13 3 2 3 3 3 .12 .08 .11 .11 .11 16 17 18 19 20 9.0 8.9 8.7 8.6 8.4 1 1 1 1 1 .02 .02 .02 .02 .02 9.4 8.3 8.4 11 12 3 2 2 2 5 .08 .04 .05 .06 .16 13 13 76 19 16 3 3 143 5 3 .11 .11 113 .26 .13 21 22 23 24 25 8.3 8.3 7.8 7.8 7.9 1 1 1 1 1 .02 .02 .02 .02 .02 9.7 9.0 8.1 8.4 7.9 4 4 4 4 3 .10 .10 .09 .09 .06 15 14 14 13 12 3 2 2 3 3 .12 .08 .08 .11 .10 26 27 28 29 30 31 9.4 8.4 8.2 7.5 7.8 7.8 1 1 1 1 1 1 .03 .02 .02 .02 .02 .02 12 80 21 --- 9 167 9 --- .29 208 .51 --- 12 13 12 122 22 21 3 2 2 272 25 22 .10 .07 .06 363 1.5 1.2 TOTAL 317.4 2.78 328.2 210.06 692 490.37 166 RIO GRANDE DE LOIZA BASIN 50050900 RIO GRANDE DE LOIZA AT QUEBRADA ARENAS. PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 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 12 8 .26 12 11 .36 15 2 .08 2 11 5 .15 11 11 .33 15 2 .08 3 11 2 .06 11 11 .33 14 2 .08 4 9.5 2 .05 11 10 .30 14 2 .08 5 9.5 2 .05 12 10 .32 14 2 .08 6 9.6 2 .05 11 10 .30 13 2 .07 7 9.5 2 .05 11 10 .30 13 1 .04 8 8.8 2 .05 11 10 .30 13 2 .07 9 10 8.3 8.0 2 2 .04 .04 11 11 11 10 .33 .30 13 13 5 8 .18 .28 11 8.3 2 .04 16 11 .48 12 5 .16 12 8.7 4 .09 17 11 .50 12 3 .10 13 11 6 .18 14 15 1.7 13 3 .11 14 8.2 8 .18 156 269 244 12 3 .10 15 8.2 9 .20 282 759 2330 12 2 .06 16 15 17 .69 95 153 63 11 2 .06 17 27 35 2.6 205 648 1150 10 2 .05 18 24 32 2.1 1110 1910 14100 9.8 1 .03 19 13 12 .42 84 70 16 10 2 .05 20 11 10 .30 53 18 2.6 9.5 1 .03 21 23 34 6.5 39 21 2.2 9.3 1 .03 22 43 111 134 31 21 1.8 9.3 1 .03 23 264 691 3600 27 20 1.5 9.3 1 .03 24 111 245 276 25 10 .68 9.2 1 .02 25 53 97 35 26 10 .70 9.8 1 .03 26 27 25 18 15 11 1.0 .53 22 19 10 40 .59 2.2 9.5 9.5 1 2 .03 .05 28 16 10 .43 18 4 .19 8.7 5 .12 29 30 14 13 10 11 .38 .39 18 17 4 3 .19 .14 8.6 8.6 8 10 .19 .23 31 --- --- --- 16 2 .09 --- --- --- TOTAL 811.6 4061.83 2402 17921.73 340.1 2.55 RIO GRANDE DE LOIZA BASIN 167 50050900 RIO GRANDE DE LOIZA- AT QUEBRADA ARENAS, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 DAY MEAN DISCHARGE (CFS) MEAN CONCEN- TRATION (MG/L) SEDIMENT DISCHARGE (TONS/DAY) MEAN DISCHARGE (CFS) MEAN CONCEN- TRATION (MG/L) SEDIMENT DISCHARGE (TONS/DAY) MEAN DISCHARGE (CFS) MEAN CONCEN- TRATION (MG/L) SEDIMENT DISCHARGE (TONS/DAY) JULY AUGUST SEPTEMBER 1 2 3 4 5 10 10 10 10 9.1 11 11 10 9 8 .30 .30 .27 .24 .20 13 16 13 12 11 4 5 5 4 3 .14 .22 .18 .13 .09 18 15 13 12 12 2 2 2 2 2 .10 .08 .07 .06 .06 6 7 8 9 10 8.9 8.6 8.6 8.6 8.1 8 9 10 10 10 .19 .21 .23 .23 .22 12 12 12 11 11 2 2 2 3 3 .06 .06 .06 .09 .09 11 10 22 15 12 3 3 20 9 5 .09 .08 1.2 .36 .16 11 12 13 14 15 8.6 8.1 7.9 8.5 51 10 8 8 8 75 .23 .17 .17 .18 23 10 10 22 15 14 2 1 20 12 10 .05 .03 1.2 .49 .38 13 170 158 72 38 5 511 323 120 25 .18 2150 390 41 2.6 16 17 18 19 20 136 261 26 17 27 399 634 27 20 25 722 2490 1.9 .92 1.8 11 10 12 11 10 9 8 7 4 4 .27 .22 .23 .12 .11 25 21 19 18 17 5 5 3 2 2 .34 .28 .15 .10 .09 21 22 23 24 25 25 16 16 48 29 22 5 3 109 40 1.5 .22 .13 61 6.5 11 10 9 4 9 9 10 4 4 4 4 4 .12 .11 .10 .11 .11 16 16 15 61 263 3 3 3 76 560 .13 .13 .12 36 3140 26 27 28 29 30 31 47 20 33 22 17 15 65 20 35 5 4 4 15 1.1 5.7 .30 .18 .16 9 9 146 98 23 17 15 4 264 158 12 3 2 .11 459 82 .75 .14 .08 75 32 67 31 28 --- 137 40 115 40 30 --- 55 3.5 41 3.3 2.3 --- TOTAL 931.0 3334.55 607.2 546.85 1295 5868.48 YEAR 12803.5 48624.85 168 RIO GRANDE DE LOIZA BASIN 50050900 RIO GRANDE DE LOIZA AT QUEBRADA ARENAS, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 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 NOVEMBER DECEMBER 1 76 209 255 58 72 14 16 10 .43 2 43 42 4.9 44 56 6.7 15 9 .36 3 63 67 20 38 45 4.6 15 9 .36 4 71 91 51 33 30 2.7 14 5 .19 5 80 218 109 32 25 2.2 18 5 .24 6 1250 2140 9930 30 22 1.8 17 5 .23 7 471 939 2430 27 21 1.5 15 12 .49 8 151 252 142 25 21 1.4 14 16 .60 9 83 110 25 24 21 1.4 14 17 .64 10 64 80 14 23 20 1.2 15 16 .65 11 51 65 9.0 22 19 1.1 14 15 .57 12 43 58 6.7 43 28 4.9 23 8 .50 13 37 45 4.5 34 61 20 16 4 .17 14 34 25 2.3 26 6 .42 14 4 .15 15 32 4 .35 27 6 .44 14 3 .11 16 30 4 .32 26 6 .42 14 3 .11 17 46 84 21 28 17 1.3 14 3 .11 18 60 98 25 83 179 145 13 3 .11 19 36 45 4.4 29 26 2.0 15 4 .16 20 29 18 1.4 29 21 1.6 16 4 .17 21 28 10 .76 24 19 1.1 13 5 .18 22 27 22 1.6 21 6 .34 13 5 .18 23 139 319 351 20 5 .27 14 5 .19 24 236 773 1840 19 5 .26 17 5 .23 25 79 60 13 18 4 .19 15 5 .20 26 160 919 1710 17 4 .18 14 5 .19 27 66 89 16 17 4 .18 13 5 .18 28 45 58 7.0 17 6 .28 13 5 .18 29 167 444 1120 16 7 .30 12 5 .16 30 54 70 10 17 8 .37 12 5 .16 31 70 97 40 --- --- 11 7 .21 TOTAL 3821 18165.23 867 218.15 453 8.41 RIO GRANDE DE LOIZA BASIN 169 50050900 RIO GRANDE DE LOIZA AT QUEBRADA ARENAS. PR-Continued SEDIMENT DISCHARGE. SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 DAY MEAN DISCHARGE (CFS) MEAN CONCEN- TRATION (MG/L) SEDIMENT DISCHARGE (TONS/DAY) MEAN DISCHARGE (CFS) MEAN CONCEN- TRATION (MG/L) SEDIMENT DISCHARGE (TONS/DAY) MEAN DISCHARGE (CFS) MEAN CONCEN- TRATION (MG/L) SEDIMENT DISCHARGE (TONS/DAY) JANUARY FEBRUARY MARCH 1 2 3 4 5 13 13 15 19 13 8 8 8 10 9 .28 .28 .32 .51 .32 11 9.1 13 16 16 3 4 5 4 3 .09 .10 .18 .17 .13 8.5 7.9 7.8 8.6 9.6 2 1 1 1 1 .05 .02 .02 .02 .03 6 7 8 9 10 12 11 11 45 20 8 9 9 64 12 .26 .27 .27 18 .65 11 10 9.8 9.1 8.9 2 1 1 1 1 .06 .03 .03 .02 .02 8.6 8.5 7.7 7.6 7.4 1 1 1 1 1 .02 .02 .02 .02 .02 11 12 13 14 15 16 14 12 12 11 6 5 5 5 6 .26 .19 .16 .16 .18 9.0 9.0 8.6 8.3 8.3 1 1 1 3 2 .02 .02 .02 .07 .04 8.3 8.1 11 14 14 1 1 3 9 9 .02 .02 .09 .34 .34 16 17 18 19 20 11 16 15 12 12 7 9 9 7 7 .21 .39 .36 .23 .23 8.3 9.1 9.1 36 18 3 3 3 61 18 .07 .07 .07 13 .87 9.2 8.2 7.7 7.3 7.4 8 7 5 3 1 .20 .15 .10 .06 .02 21 22 23 24 25 17 12 12 26 15 10 6 5 11 3 .46 .19 .16 .77 .12 11 9.8 9.2 9.0 9.4 1 1 1 1 2 .03 .03 .02 .02 .05 7.1 7.0 6.9 7.0 7.0 1 1 1 1 1 .02 .02 .02 .02 .02 26 27 28 29 30 31 12 11 11 11 11 11 2 2 2 1 1 2 .06 .06 .06 .03 .03 .06 8.8 8.6 8.7 --- 3 4 3 --- .07 .09 .70 --- 10 9.9 11 197 26 27 1 1 1 370 20 20 .03 .03 .03 627 1.4 1.5 TOTAL 452 25.53 312.7 16.09 493.3 631.67 170 RIO GRANDE DE LOIZA BASIN 50050900 RIO GRANDE DE LOIZA AT QUEBRADA ARENAS, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 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 22 20 1.2 20 22 1.2 28 17 1.3 2 16 15 .65 16 20 .86 30 10 .81 3 15 15 .61 19 18 .92 26 6 .42 4 60 96 75 16 10 .43 22 5 .30 5 40 84 27 13 4 .14 22 5 .30 6 23 10 .62 41 76 29 22 5 .30 7 16 10 .43 41 55 11 20 4 .22 8 20 15 1.3 50 101 112 20 4 .22 9 16 2 .09 25 27 1.8 49 78 21 10 12 1 .03 205 480 1070 214 333 1270 11 11 1 .03 91 160 70 27 32 2.3 12 11 1 .03 31 36 3.0 23 30 1.9 13 11 1 .03 197 740 5090 32 22 1.9 14 11 1 .03 138 253 329 27 22 1.6 15 10 1 .03 36 42 4.1 26 20 1.4 16 9.9 1 .03 28 32 2.4 25 18 1.2 17 9.4 1 .03 43 64 21 21 15 .85 18 8,7 1 .02 245 639 3740 18 6 .29 19 8.5 1 .02 52 68 9.5 42 76 23 20 8.7 1 .02 37 45 4.5 21 3 .17 21 8.8 1 .02 47 60 7.6 18 2 .10 22 9.6 1 .03 62 126 70 17 2 .09 23 8.3 1 .02 34 41 3.8 16 2 .09 24 8.5 1 .02 29 33 2.6 16 2 .09 25 8.3 2 .04 26 29 2.0 15 2 .08 26 8.7 2 .05 25 27 1.8 15 2 .08 27 9.6 2 .05 25 27 1.8 18 2 .08 28 33 46 14 24 26 1.7 16 2 .09 29 226 453 2330 58 113 95 14 2 .08 30 37 45 4.5 25 120 19 13 2 .07 31 --- --- --- 172 362 1840 --- --- --- TOTAL 697.0 2455.93 1871 12546.15 873 1330.33 RIO GRANDE DE LOIZA BASIN 171 50050900 RIO GRANDE DE LOIZA AT QUEBRADA ARENAS. PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 DAY MEAN DISCHARGE (CFS) MEAN CONCEN- TRATION (MG/L) SEDIMENT DISCHARGE (TONS/DAY) MEAN DISCHARGE (CFS) MEAN CONCEN- TRATION (MG/L) SEDIMENT DISCHARGE (TONS/DAY) MEAN DISCHARGE (CFS) MEAN CONCEN- TRATION (MG/L) SEDIMENT DISCHARGE (TONS/DAY) JULY AUGUST SEPTEMBER 1 2 3 4 5 16 14 14 13 13 2 2 2 2 2 .09 .08 .08 .07 .07 9.9 9.4 9.0 10 9.3 4 4 4 4 4 .11 .10 .10 .11 .10 15 13 11 11 22 3 3 3 3 31 .12 .11 .09 .09 4.4 6 7 8 9 10 23 17 13 12 11 29 17 3 3 3 2.6 .92 .11 .10 .09 8.5 17 16 9.7 9.2 4 19 21 10 9 .09 2.7 1.8 .26 .22 12 10 9.6 9.3 8.7 7 7 7 7 8 .23 .19 .18 .18 .19 11 12 13 14 15 15 17 12 12 15 4 4 3 3 3 .16 .18 .10 .10 .12 30 12 34 19 12 52 20 57 21 9 15 .65 8.9 1.4 .29 8.0 8.0 9.4 8.5 7.9 9 10 11 12 13 .19 .22 .28 .28 .28 16 17 18 19 20 13 11 11 10 9.8 3 3 3 3 3 .11 .09 .09 .08 .08 11 9.8 9.2 8.8 8.5 8 6 5 5 5 .24 .16 .12 .12 .11 7.6 7.3 7.0 7.1 7.0 12 11 9 7 7 .25 .22 .17 .13 .13 21 22 23 24 25 11 9.7 9.7 9.1 9.1 4 4 4 4 4 .12 .10 .10 .10 .10 7.8 7.9 8.0 9.5 9.5 5 5 4 4 3 .11 .11 .09 .10 .08 6.9 9.9 13 55 40 7 9 15 90 60 .13 .27 .62 24 11 26 27 28 29 30 31 9.2 9.8 9.0 8.6 18 11 4 4 4 4 22 4 .10 .11 .10 .09 2.0 .12 7.9 7.4 89 280 22 20 3 3 125 659 20 23 .06 .06 191 2300 1.2 2.3 24 13 11 9.8 9.0 --- 22 8 8 8 8 --- 2.0 .28 .24 .21 .19 --- TOTAL 386.0 8.36 731.3 2527.69 391.0 46.87 YEAR 11348.3 37980.41 I I I I 172 RIO GRANDE DE LOIZA BASIN 50051150 QUEBRADA BLANCA AT EL JAGUAL, PR LOCATION.--Lat 18'09'40*, long 65°58'58*. Hydrologic Unit 21010005, 0.1 mi (0.2 km) upstream fro bridge on Highway 181, and 2.8 mi (4.5 km) southwest of San Lorenzo. DRAINAGE AREA.--3.25 mil (8.42 km 2 ). 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.--5 years (1985-89), 9.28 ft'/s (0.263 m'/s), 38.78 in/yr (985 mm/yr), 6,720 acre-ft/yr (8.28 lie0/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 7,400 ft'is (210 m'/s), May 17, 1985, gage height, 14.58 ft (4.444 m). fro floodmark, fro rating curve extended above 400 ft'is (11.3 m'/s) on basis of step-backwater analysis and slope-area measurement; minimum discharge, 0.46 ft'is (0.013 m'/s), May 8, 1985. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,000 ft3/s (28.3 '/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (e/s) (ft) (m) Date Time (ft'/s) (10/s) (ft) (m) Nov. 13 1415 1,550 43.9 9.04 2.755 Mar. 10 0945 2,040 57.8 9.65 2.941 Nov. 17 0230 *2,430 68.8 *10.17 3.100 Sept. 18 0900 2,350 66.6 9.75 2.972 Minimum discharge, 0.77 ft'/s (0.022 m 3/s), Aug. 9.10. DISCHARGE. CUBIC FEET PER SECOND. WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 2.1 3.5 5.0 7.7 2.8 3.5 14 2.4 6.7 1.0 1.3 3.3 2 5.2 4.1 4.9 5.6 2.5 3.1 6.5 3.0 7.2 4.0 1.1 2.7 3 4.5 3.4 4.8 4.7 2.5 2.9 5.2 2.3 24 2.4 .96 3.2 4 27 3.2 4.3 4.4 2.6 3.1 4.4 3.8 11 1.3 3.3 2.5 5 5.0 3.0 5.5 4.2 2.5 12 3.8 2.9 6.3 11 2.7 2.2 6 3.3 3.2 4.0 3.9 2.6 9.7 3.3 9.3 4.3 9.4 1.1 2.1 7 4.3 4.9 4.0 3.8 2.4 5.0 3.2 13 3.4 12 .84 2.0 8 4.0 29 4.4 3.7 2.9 4.0 14 3.4 2.7 5.6 .84 1.9 9 2.8 36 3.8 3.4 3.1 39 3.8 2.6 2.2 3.0 .80 2.1 10 2.5 5.9 3.8 4.3 2.6 295 6.8 2.1 2.0 2.0 .81 8.4 11 2.3 4.7 3.7 9.6 2.5 36 4.5 1.8 3.0 1.7 9.2 6.6 12 2.8 3.6 3.5 5.4 2.4 16 18 1.8 2.1 3.6 3.1 8.9 13 3.6 71 3.7 4.3 2.4 25 7.8 1.8 1.9 1.5 2.0 4.5 14 2.3 11 3.7 3.7 2.4 17 6.0 1.8 1.7 1.2 1.7 17 15 3.8 6.2 3.4 3.5 4.5 12 4.3 1.7 1.6 1.4 1.3 4.9 16 2.8 26 3.3 3.3 11 8.8 4.5 1.6 1.7 1.0 1.8 4.8 17 4.4 311 23 6.7 42 7.5 4.1 1.4 3.3 1.0 14 9.7 18 3.1 36 5.3 4.5 49 6.4 3.5 1.5 2.0 1.5 5.3 144 19 2.3 17 3.9 4.3 7.6 5.9 2.9 1.4 2.0 1.7 35 15 20 11 11 3.7 4.3 4.6 5.7 2.8 1.3 1.7 1.3 13 7.0 21 25 9.3 3.4 17 36 4.9 2.7 1.3 1.5 1.1 7.5 6.0 22 6.9 8.0 4.0 4.8 11 37 2.8 1.2 1.5 1.2 4.0 24 23 4.8 6.6 4.3 3.6 6.5 9.4 2.4 1.2 1.5 3.0 4.3 54 24 5.5 5.6 4.9 3.2 5.1 5.6 2.3 1.2 1.4 1.6 5.8 e9.4 25 4.5 17 28 2.9 4.2 5.0 2.1 1.2 1.4 1.4 3.8 e9.7 26 3.8 35 15 2.8 5.1 5.7 2.1 1.5 1.2 3.2 2.6 e8.8 27 3.4 12 6.6 2.8 3.8 4.5 2.1 6.5 1.1 7.1 14 e8.3 28 3.8 7.7 7.2 2.7 3.4 3.8 1.9 3.6 1.0 3.9 4.0 e16 29 4.5 6.2 57 2.6 --- 3.5 2.2 2.5 1.6 1.6 6.0 e15 30 5.0 5.5 53 2.5 11 2.4 8.6 1.1 1.1 10 e8.8 31 4.2 --- 11 2.4 33 --- 9.5 --- 1.5 4.6 --- TOTAL 170.5 706.6 296.1 142.6 230.0 641.0 146.4 99.2 104.1 94.3 166.75 412.8 MEAN 5.50 23.6 9.55 4.60 8.21 20.7 4.88 3.20 3.47 3.04 5.38 13.8 MAX 27 311 57 17 49 295 18 13 24 12 35 144 MIN 2.1 3.0 3.3 2.4 2.4 2.9 1.9 1.2 1.0 1.0 .80 1.9 AC-FT 338 1400 587 283 456 1270 290 197 206 187 331 819 CFSM 1.69 7.25 2.94 1.42 2.53 6.36 1.50 .98 1.07 .94 1.66 4.23 IN. 1.95 8.09 3.39 1.63 2.63 7.34 1.68 1.14 1.19 1.08 1.91 4.72 CAL YR 1988 TOTAL 3275.5 MEAN 8.95 MAX 311 MIN 1.2 AC-FT 6500 CFSM 2.75 IN. 37.49 WTR YR 1989 TOTAL 3210.35 MEAN 8.80 MAX 311 MIN .80 AC-FT 6370 CFSM 2.71 IN. 36.75 e Estimated RIO GRANDE DE LOIZA BASIN 50051150 QUEBRADA BLANCA AT EL JAGUAL, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--JANUARY 1985 TO CURRENT YEAR STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) OCT, 04 1345 26 162 25.0 APR, 06 1150 3.5 225 26.0 NOV, 04 1308 3.3 258 27.5 MAY, 10 1233 2.3 274 26.5 DEC, 07 1446 3.8 282 24.5 JUN, 13 1251 2.2 256 28.0 JAN, 04 -- 4.5 242 -- JUL, 12 1154 4.5 244 27.5 FEB, 07 -- 2.4 269 -- AUG, 23 1012 4.0 232 26.5 MAR, 08 1309 4.3 241 23.5 173 174 RIO GRANDE DE LOIZA BASIN 50051150 QUEBRADA BLANCA AT EL JAGUAL, PR--Continued WATER QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT SED. SED. SED. DIS- SEDI- SUSP. SUSP. SUSP. CHARGE, MENT, FALL FALL FALL INST. SEDI- DIS- DIAM. DIAM. DIAM. CUBIC MENT, CHARGE, PERCENT PERCENT PERCENT FEET SUS- SUS- FINER FINER FINER DATE TIME PER PENDED PENDED THAN THAN THAN SECOND (MG/L) (T/DAY) .002 MM .004 MM .008 MM AUG 1989 11... 1721 80 1280 276 30 33 46 19... 0007 125 2420 817 11 29 34 SEP 13... 2355 41 960 106 33 49 60 18... 0457 40 1000 108 34 -- 41 18... 0530 108 725 211 34 44 50 18... 0800 488 2300 3030 20 22 28 20... 0938 50 2200 297 37 45 54 20... 2122 100 2500 675 8 13 19 SED. SED. SED. SED. SED. SED. SED. SUSP. SUSP. SUSP. SUSP. SUSP. SUSP. SUSP. FALL FALL SIEVE SIEVE SIEVE SIEVE SIEVE DIAM. DIAM. DIAM. DIAM, DIAM. DIAM. DIAM. PERCENT PERCENT PERCENT PERCENT PERCENT PERCENT PERCENT FINER FINER FINER FINER FINER FINER FINER DATE THAN THAN THAN THAN THAN THAN THAN .016 MM .031 MM .062 MM .125 MM .250 MM .500 MM 1.00 MM AUG 1989 11... 68 76 79 91 99 100 100 19... 57 66 89 97 99 100 100 SEP 13... -- -- 93 97 99 100 18... 45 -- 57 89 93 98 100 18... 67 73 82 94 99 99 100 18... 73 79 81 83 93 98 99 20... 56 75 83 94 98 99 100 20... 28 36 47 92 96 98 99 I I 175 RIO GRANDE DE LOIZA BASIN 50051310 RIO CAYAGUAS AT CERRO 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 mil (26.4 km 2 ). 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 sap. 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.--12 years (1978-89), 48.7 ft'/s (1.379 10/s), 64.8 in/yr (1,646 mm/yr), 35,280 acre-ft/yr (43.50 hm 3/yr); median of yearly mean discharges, 40.3 ft'is (1.14 m 3/s), 29,200 acre-ft/yr (36.0 he0/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 13,200 ft'/s (374 m'/s), Aug. 31, 1979, gage height, 9.44 ft (2.877 ), site and datum then in use, from rating curve extended above 1,000 ft'/s (28.3 m'/s) on basis of slope-area measurement; minimum discharge, 7.1 ft'/s (0.201 '/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 ft'is (70.8 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (80/s) (ft) (m) Date Time (ft'/s) (10/s) (ft) (m) Sept. 18 0930 *2.690 76.2 *13.55 4.130 No other peak greater than base discharge. Minimum daily discharge, 11 ft'is (0.312 10/s), May 21-25. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 39 33 e37 e40 25 40 23 e15 e34 14 20 23 2 42 38 e35 e32 23 38 22 e16 e30 27 19 22 3 46 e30 e35 e30 23 40 20 e15 el50 35 19 22 4 78 e25 e34 e27 23 41 20 e14 e80 21 19 20 5 38 e23 e35 e25 23 45 20 e15 e50 62 18 19 6 34 e30 e33 e23 25 44 19 e25 e30 36 17 18 7 53 41 e31 e24 23 43 20 e43 e23 31 17 17 8 37 47 e30 e27 26 43 24 e40 e20 29 17 16 9 33 e41 e30 e26 25 65 23 e20 e19 24 17 16 10 32 e33 e30 e26 24 242 33 e16 e18 23 17 17 11 31 e40 e29 36 24 66 24 e16 e17 24 18 19 12 30 e35 e28 36 23 53 24 e15 e17 37 18 e25 13 29 e100 e28 39 23 63 23 e14 17 24 19 e21 14 21 e70 e27 24 23 54 21 e14 17 22 17 e23 15 25 e45 e26 23 24 47 20 e14 17 24 16 23 16 22 e60 e27 24 33 45 21 e13 17 25 16 22 17 21 e500 e50 28 113 39 20 e13 20 25 21 22 18 17 e150 e37 30 74 36 e18 e12 18 28 24 585 19 17 e90 e27 29 40 34 e16 e12 18 26 66 86 20 49 00 e26 29 38 33 e15 e12 17 24 26 55 21 63 e55 e25 37 42 31 e14 ell 17 23 20 273 22 35 e50 e26 28 39 30 e16 eli 16 22 18 144 23 34 e45 e28 27 38 29 e15 eli 17 44 21 179 24 35 e43 e30 26 39 29 e14 eli 16 25 24 237 25 34 e60 e54 26 38 29 e14 ell 16 24 20 132 26 34 e90 e40 26 53 27 e13 e15 15 25 18 64 27 34 e60 e32 26 44 25 e13 21 15 24 82 54 28 34 e45 e30 26 38 24 e12 el7 14 27 25 103 29 35 e40 e80 26 --- 23 e13 e15 16 23 32 97 30 35 e38 e100 25 26 e16 e16 14 21 37 49 31 34 --- e60 25 22 --- 57 20 26 --- TOTAL 1101 2027 1140 876 986 1406 566 550 785 839 744 2403 MEAN 35.5 67.6 36.8 28.3 35.2 45.4 18.9 17.7 26.2 27.1 24.0 80.1 MAX 78 500 100 40 113 242 33 57 150 62 82 585 MIN 17 23 25 23 23 22 12 11 14 14 16 16 AC-FT 2180 4020 2260 1740 1960 2790 1120 1090 1560 1660 1480 4770 CFSM 3.48 6.62 3.61 2.77 3.45 4.45 1.85 1.74 2.57 2.65 2.35 7.85 IN. 4.02 7.39 4.16 3.19 3.60 5.13 2.06 2.01 2.86 3.06 2.71 8.76 CAL YR 1988 TOTAL 14414.9 MEAN 39.4 MAX 531 MIN 8.5 AC-FT 28590 CFSM 3.86 IN. 52.57 WTR YR 1989 TOTAL 13423 MEAN 36.8 MAX 585 MIN 11 AC-FT 26620 CFSM 3.61 IN. 48.95 e Estimated 176 RIO GRANDE DE LOIZA BASIN 50051310 RIO CAVAGUAS AT CERRO GORDO, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS AUGUST 1981 TO CURRENT YEAR STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) OCT, 06 1430 34 129 28.0 APR, 05 1031 20 124 24.0 NOV. 09 1223 42 117 26.0 MAY, 09 1039 21 134 24.5 DEC, 09 1417 31 173 23.5 JUN, 12 1121 18 138 25.5 JAN, 03 -- 31 128 -- JUL, 13 1004 33 98 25.5 FEB, 02 0913 23 132 20.0 AUG, 15 1148 17 130 27 MAR, 09 1307 83 86 23.5 I 177 RIO GRANDE 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 kie). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--'December 1983 to current year. 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'is (0.793 •'/s), 48.19 in/yr (1,224 mm/yr), 20,290 acre-ft/yr (25.0 hm'/yr) . EXTREMES FOR PERIOD OF RECORD.--Maximu discharge, 13,800 ft'is (391 mi/s), Nov.27, 1987, gage height, 18.02 ft (5.492 m). from floodmark, from rating curve extended above 200 ft'/s (5.66 40/s) on basis of step-backwater analysis and slope-area measurement; minimum discharge, 1.4 ft'is (0.040 mi/s), Oct. 11, 1987. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,500 ft3/s (42.5 m 3/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (10/s) (ft) (m) Date Time (W/s) (m 3/s) (ft) (m) Nov. 17 0315 2,230 63.1 9.26 2.822 Sept. 23 2130 *2,300 65.1 *9.35 2.850 Sept. 18 0930 1,510 42.8 8.21 2.502 Minimum discharge. 4.4 ft'is (0.125 m3/s), Aug. 15. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 19 15 22 23 13 18 26 11 16 6.3 9.6 11 2 23 36 21 19 12 17 19 12 17 12 8.2 10 3 27 17 21 17 12 17 16 11 27 9.0 9.0 10 4 47 15 20 16 11 18 15 12 19 6.6 11 9.4 5 24 15 22 15 11 21 14 12 12 29 9.9 9.6 6 21 15 19 14 12 28 13 19 9.9 15 6.5 9.4 7 35 18 20 15 11 21 13 22 9.2 19 6.0 8.8 8 22 43 18 14 13 22 21 13 8.7 14 6.1 8.6 9 20 53 17 13 12 42 13 11 8.2 10 6.0 10 10 19 24 17 14 11 139 33 10 8.3 11 6.3 25 11 18 27 16 24 11 36 18 9.8 8.8 9.6 6.9 19 12 23 27 15 20 10 25 25 9.4 8.1 13 5.8 16 13 22 79 15 18 10 36 20 9.3 7.9 8.8 10 14 14 18 35 14 14 10 39 18 9.0 7.7 8.1 8.2 35 15 20 28 14 14 33 28 15 8.6 7.6 7.7 5.9 20 16 20 75 14 13 44 23 16 8.4 7.4 7.1 5.7 16 17 28 350 25 25 337 20 14 8.0 8.5 7.1 30 21 18 21 98 16 19 143 18 13 7.9 7.8 7.8 13 395 19 18 53 15 18 41 17 12 7.8 7.4 6.9 129 81 20 32 38 14 17 29 16 12 7.7 7.1 6.1 20 38 21 37 31 13 57 47 15 12 7.6 6.9 6.2 14 35 22 23 29 13 20 31 55 11 7.4 7.4 5.8 11 93 23 21 25 15 16 25 25 10 7.3 7.5 15 20 285 24 21 23 14 15 23 19 10 6.8 6.8 6.6 17 177 25 19 67 31 14 21 19 10 7.1 6.9 5.9 12 60 26 17 59 21 14 22 20 10 8.0 6.4 6.5 11 42 27 16 37 15 13 19 16 9.9 21 6.2 9.5 18 34 28 17 27 14 12 18 15 9.7 15 6.0 12 12 33 29 26 25 54 13 --- 16 11 9.6 6.7 6.4 19 33 30 19 23 70 12 22 10 12 6.1 8.0 21 25 31 17 --- 25 12 46 --- 20 --- 8.9 13 --- TOTAL 710 1407 640 540 992 869 449.6 340.7 280.5 304.9 481.1 1583.8 MEAN 22.9 46.9 20.6 17.4 35.4 28.0 15.0 11.0 9.35 9.84 15.5 52.8 MAX 47 350 70 57 337 139 33 22 27 29 129 395 MIN 16 15 13 12 10 15 9.7 6.8 6.0 5.8 5.7 8.6 AC-FT 1410 2790 1270 1070 1970 1720 892 676 556 605 954 3140 CFSM 2.90 5.94 2.62 2.21 4.49 3.55 1.90 1.39 1.19 1.25 1.97 6.69 IN. 3.35 6.63 3.02 2.55 4.68 4.10 2.12 1.61 1.32 1.44 2.27 7.47 CAL YR 1988 TOTAL 10072.8 MEAN 27.5 MAX 504 MIN 5.5 AC-FT 19980 CFSM 3.49 IN. 47.49 WTR YR 1989 TOTAL 8598.6 MEAN 23.6 MAX 395 MIN 5.7 AC-FT 17060 CFSM 2.99 IN. 40.54 178 RIO GRANDE DE LOIZA BASIN 50053050 RIO TURABO AT BORINOUEN. PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS JANUARY 1985 TO CURRENT YEAR STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW. SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) OCT, 06 0835 21 150 24.0 APR. 04 1313 15 148 27.0 NOV. 03 0920 17 145 24.0 MAY, 03 0833 11 155 22.5 DEC, 07 1209 18 194 24.0 JUN, 08 0938 1.0 160 24.5 JAN. 13 -- 19 143 -- JUL, 14 1318 8.7 153 31.0 FEB, 06 1434 12 132 25.5 AUG, 16 1136 5.7 157 28.0 MAR. 01 1545 20 151 26.0 I 179 RIO GRANDE DE LOIZA BASIN 50055000 RIO GRANDE DE LOIZA AT CAGUAS, PR LOCATION .--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 mil (232.6 km 2). 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. Elevation of gage is 143.28 ft (43.672 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 DISCHARGES.--29 years (1961-89), 227 ft'is (6.429 m'/s). 34.33 in/yr (872 mm/yr), 164,500 acre-ft/yr (203 NO/yr); median of yearly mean discharges, 220 ft'/s (6.23 m'/s), 159,000 acre-ft/yr (196 he/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 71,500 ftl/s (2,020 m'/s), Sept. 6, 1960, gage height, 31.17 ft (9.501 m), fro rating curve extended above 6,000 ft'/s (170 m'/s) on basis of slope-area measurement; minimum daily discharge, 10 ft3/s (0.283 m'/s), Apr. 5, 10, 29, 1968. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 8,000 ft'is (227 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (W/s) (e/s) (ft) (m) Date Time (W/s) (e/s) (ft) (m) Nov. 17 0430 17,100 484 16.90 5.151 Sept. 18 1045 *27,700 784 *20.30 6.187 Mar. 10 1115 10,700 303 14.28 4.352 Sept. 21 unknown 11,900 337 unknown Minimum discharge, 42 ft'is (1.189 m'/s), May 25, Aug. 9,10. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 143 141 176 189 104 124 258 79 279 47 64 128 2 190 220 173 157 94 117 175 92 219 181 60 114 3 225 146 175 143 98 113 145 102 485 198 63 133 4 769 129 163 130 97 119 121 90 321 74 108 92 5 264 125 173 120 87 164 111 114 151 530 138 82 6 197 132 160 112 88 209 102 173 117 265 62 75 7 307 167 149 115 84 176 97 229 97 213 51 68 8 212 253 148 132 112 152 269 126 89 192 50 65 9 202 417 144 128 97 601 122 87 84 107 49 68 10 177 199 148 126 93 2710 247 76 78 85 47 163 11 175 246 149 180 81 463 193 71 97 82 59 213 12 185 221 135 213 78 240 236 67 84 153 92 233 13 242 849 138 223 74 346 233 65 76 93 98 109 14 164 365 134 135 73 268 184 64 69 71 81 370 15 189 266 124 121 174 233 128 60 66 72 62 179 16 238 511 133 119 207 197 129 57 65 64 62 141 17 275 4860 281 152 2540 176 130 57 74 62 135 254 18 210 762 203 146 1320 158 113 53 86 71 134 7080 19 166 444 136 138 296 141 102 54 71 68 1010 711 20 304 335 126 138 203 131 95 50 63 64 278 331 21 573 279 120 291 336 133 90 51 59 56 204 e600 22 265 262 130 160 251 275 99 50 64 58 122 e1300 23 204 234 145 123 175 231 87 48 61 161 149 e4000 24 270 209 148 114 159 170 80 46 61 100 249 e1700 25 204 446 320 108 145 137 78 48 57 73 127 e700 26 161 523 221 110 222 139 73 62 56 87 91 376 27 228 319 163 112 207 141 70 323 51 92 398 328 28 335 219 136 99 134 118 68 191 51 138 150 408 29 250 199 573 100 --- 201 73 107 53 79 167 718 30 273 185 669 104 507 97 150 52 68 315 277 31 186 --- 239 93 601 --- 391 --- 73 187 --- TOTAL 7783 13663 6032 4331 7629 9491 4005 3233 3236 3677 4862 21016 MEAN 251 455 195 140 272 306 133 104 108 119 157 701 MAX 769 4860 669 291 2540 2710 269 391 485 530 1010 7080 MIN 143 125 120 93 73 113 68 46 51 47 47 65 AC-FT 15440 27100 11960 8590 15130 18830 7940 6410 6420 7290 9640 41690 CFSM 2.80 5.07 2.17 1.56 3.03 3.41 1.49 1.16 1.20 1.32 1.75 7.80 IN. 3.22 5.66 2.50 1.79 3.16 3.93 1.66 1.34 1.34 1.52 2.01 8.71 CAL YR 1988 TOTAL 90074 MEAN 246 MAX 4860 MIN 31 AC-FT 178700 CFSM 2.74 IN. 37.31 WTR YR 1989 TOTAL 88958 MEAN 244 MAX 7080 MIN 46 AC-FT 176400 CFSM 2.71 IN. 36.85 e Estimated 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. REMARKS.-- The suspended-sediment data included in this report is part of a 5-year hydrologic investigation conducted in the Rio Grande de Loiza Basin to account the amount of suspended- sediment transported to Lago Loiza, a water supply reservoir. 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, 1,950 mg/L November 17, 1988 ; minimum daily mean, 23 mg/L August 26, 1989. SEDIMENT LOADS: Maximum daily mean, 51,600 tons (46,800 tonnes) September 18, 1989 ; minimum daily 5.7 ton (5.2 tonnes) August 26, 1989. 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 1988 TO SEPTEMBER 1989 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1988 11... 1030 156 228 7.40 26.5 180 4.9 60 16 K16000 6100 DEC 14... 0940 133 233 6.50 22.0 5.2 6.9 78 <10 K300 2800 FEB 1989 16... 0910 174 216 6.30 21.0 410 8.1 90 17 44000 43000 APR 11... 0920 192 187 6.50 23.0 65 8.1 94 32 31000 9200 JUN 09... 0905 82 240 7.00 26.0 110 7.4 90 54 K8500 730 AUG 03... 1100 52 267 7.30 29.0 37 6.5 84 27 33000 44000 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SIUM, SODIUM, AD- SIUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1988 11... 69 0 17 6.4 18 1 1.8 70 <0.5 13 15 DEC 14... 74 FEB 1989 16... 59 APR 11... 57 0 14 5.4 16 1 2.1 54 0.8 13 14 JUN 09... 80 AUG 03... 77 0 19 7.2 23 1 2.0 80 14 18 K = non-ideal count 180 181 RIO GRANDE DE LOIZA BASIN 50055000 RIO GRANDE DE LOIZA AT CAGUAS, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 19891 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 11... 0.1 32 147 62 330 0.45 0.05 0.50 0.08 0.22 DEC 14... 258 0.41 0.09 0.50 0.23 0.37 FEB 1989 16... 632 0.45 0.05 0.50 0.14 0.96 APR 11... 0.1 26 125 65 111 0.54 0.06 0.60 0.14 0.46 JUN 09... 170 0.45 0.05 0.50 0.10 0.20 AUG 03... 0.1 36 169 24 76 0.42 0.08 0.50 0.14 1.9 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA t NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (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 NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1988 11... 0.3 0.8 3.5 0.18 1 <100 20 2 <1 40 DEC 14... 0.6 1.1 4.9 0.16 FEB 1989 16... 1.1 1.6 7.1 0.64 APR 11... 0.6 1.2 5.3 0.28 <1 100 30 <1 3 10 JUN 09... 0.3 0.8 3.5 0.15 AUG 03... 2.0 2.5 11 0.23 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- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CH) (UG/L) (MG/L) MANGA- OCT 1988 11... 11000 <5 1300 <0.1 <1 <1 70 <0.01 1 <0.01 DEC 14... FEB 1989 16... APR 11... 5100 <5 320 <0.1 <1 30 <0.01 0.03 <1 <1 JUN 09... AUG 03... RIO GRANDE DE LOIZA BASIN 50055000 RIO GRANDE DE LOIZA AT CAGUAS, PR--Continued WATER QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT SED. SED. SED. DIS- SEDI- SUSP. SUSP. SUSP. CHARGE, MENT, FALL FALL FALL INST. SEDI- DIS- DIAM. DIAM. DIAM. CUBIC MENT, CHARGE, PERCENT PERCENT PERCENT FEET SUS- SUS- FINER FINER FINER DATE TIME PER PENDED PENDED THAN THAN THAN SECOND (MG/L) (T/DAY) .002 MM .004 MM .008 MM NOV 1988 17... 0345 11200 3700 111888 12 19 27 MAR 1989 10... 1235 10100 2790 76083 13 29 33 SEP 18... 1002 25700 3100 215109 1 17 26 SED. SED. SED. SED. SED. SED. SED. SUSP. SUSP. SUSP. SUSP. SUSP. SUSP. SUSP. FALL FALL SIEVE SIEVE SIEVE SIEVE SIEVE DIAM. DIAM. DIAM. DIAM. DIAM. DIAM. DIAM. PERCENT PERCENT PERCENT PERCENT PERCENT PERCENT PERCENT FINER FINER FINER FINER FINER FINER FINER DATE THAN THAN THAN THAN THAN THAN THAN .016 MM .031 MM .062 MM .125 MM 250 MM .500 MM 1.00 MM NOV 1988 17... 40 57 75 92 99 99 100 MAR 1989 10... 49 62 74 93 98 100 100 SEP 18... 33 53 67 87 97 99 100 182 RIO GRANDE DE LOIZA BASIN 50055000 RIO GRANDE DE LOIZA AT CAGUAS, 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) OCTOBER NOVEMBER DECEMBER 1 143 67 26 141 167 64 176 121 58 2 190 107 60 220 178 106 173 119 56 3 225 140 85 146 158 62 175 115 54 4 769 411 834 129 150 52 163 111 49 5 264 160 114 125 140 47 173 107 50 6 197 123 65 132 133 47 160 103 45 7 307 156 141 167 138 62 149 100 40 8 212 130 74 253 162 122 148 100 40 9 202 127 69 417 230 327 144 98 38 10 177 117 56 199 130 70 148 97 39 11 175 95 45 246 145 96 149 97 39 12 185 103 51 221 120 72 135 95 35 13 242 143 93 849 737 6100 138 93 35 14 164 105 47 365 310 306 134 89 32 15 189 110 56 266 244 175 124 86 29 16 238 132 85 511 363 718 133 84 30 17 275 143 106 4860 1950 46100 281 164 205 18 210 128 73 762 381 852 203 112 61 19 166 111 50 444 220 264 136 60 22 20 304 169 220 335 115 104 126 55 19 21 573 295 470 279 85 64 120 54 18 22 265 153 109 262 75 53 130 56 20 23 204 129 71 234 66 42 145 59 23 24 270 146 106 209 61 34 148 63 25 25 204 120 66 446 190 402 320 158 162 26 161 111 48 523 277 566 221 124 74 27 228 153 141 319 252 217 163 90 40 28 335 245 379 219 153 90 136 65 24 29 250 159 129 199 131 70 573 288 617 30 273 172 168 185 123 61 669 376 889 31 186 182 91 --- --- --- 239 165 106 TOTAL 7783 4088 13663 62195 6032 2974 183 184 RIO GRANDE DE LOIZA BASIN 50055000 RIO GRANDE DE LOIZA AT CAGUAS, 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) JANUARY FEBRUARY MARCH 1 189 84 43 104 49 14 124 90 30 2 157 60 25 94 46 12 117 89 28 3 143 48 19 98 49 13 113 87 27 4 130 40 14 97 55 14 119 89 29 5 120 36 12 87 49 12 164 99 44 6 112 36 11 88 52 12 209 125 71 7 115 37 11 84 53 12 176 110 52 8 132 42 15 112 55 17 152 103 42 9 128 42 15 97 52 14 601 331 895 10 126 44 15 93 45 11 2710 953 16700 11 180 80 39 81 45 9.8 463 263 376 12 213 110 63 78 48 10 240 103 67 13 223 126 76 74 47 9.4 346 155 145 14 135 108 39 73 47 9.3 268 114 98 15 121 93 30 174 105 49 233 140 88 16 119 80 26 207 123 88 197 123 65 17 152 80 33 2540 913 7790 176 117 56 18 146 69 27 1320 423 1780 158 109 47 19 138 64 24 296 160 128 141 100 38 20 138 63 23 203 102 56 131 91 32 21 291 158 150 336 181 259 133 94 34 22 160 80 190 251 140 95 275 163 284 23 123 73 24 175 102 48 231 155 115 24 114 72 22 159 100 43 170 104 48 25 108 70 20 145 98 38 137 97 36 26 110 67 20 222 127 99 139 92 35 27 112 68 21 207 110 61 141 102 39 28 99 67 18 134 90 33 118 89 28 29 100 65 18 --- --- --- 201 118 88 30 104 60 17 507 251 647 31 93 50 13 601 328 1120 TOTAL 4331 1073 7629 10736.5 9491 21404 185. RIO GRANDE DE LOIZA BASIN 50055000 RIO GRANDE DE LOIZA AT CAGUAS, 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 1 258 155 108 79 60 13 279 145 109 2 175 112 53 92 67 17 219 138 82 3 145 100 39 102 61 17 485 232 484 4 121 90 29 90 70 17 321 178 154 5 111 81 24 114 85 26 151 98 40 6 102 77 21 173 100 47 117 90 28 7 97 72 19 229 130 80 97 79 21 8 269 152 132 126 120 41 89 71 17 9 122 83 27 87 143 34 84 70 16 10 247 140 93 76 170 35 78 73 15 11 193 115 60 71 82 16 97 80 21 12 236 135 86 67 194 35 84 70 16 13 233 137 86 65 175 31 76 68 14 14 184 102 51 64 160 28 69 69 13 15 128 81 28 60 148 24 66 68 12 16 129 86 30 57 132 20 65 70 12 17 130 89 31 57 115 18 74 78 16 18 113 80 24 53 108 15 86 78 18 19 102 70 19 54 107 16 71 57 11 20 95 61 16 50 107 14 63 55 9.4 21 90 60 15 51 106 15 59 56 8.9 22 99 60 16 50 104 14 64 57 9.8 23 87 59 14 48 103 13 61 58 9.6 24 80 54 12 46 102 13 61 59 9.7 25 78 48 10 48 100 13 57 59 9.1 26 73 47 9.3 62 102 17 56 60 9.1 27 70 48 9.1 323 201 207 51 60 8.3 28 68 47 8.6 191 103 53 51 60 8.3 29 73 60 12 107 68 20 53 60 8.6 30 97 71 19 150 100 41 52 57 8.0 31 --- --- --- 391 186 319 --- --- --- TOTAL 4005 1101.0 3233 1269 3236 1197.8 186 RIO GRANDE DE LOIZA BASIN 50055000 RIO GRANDE DE LOIZA AT CAGUAS, 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) JULY AUGUST SEPTEMBER 1 47 59 7.5 64 60 10 128 97 34 2 181 102 50 60 99 16 114 76 23 3 198 128 68 63 110 19 133 87 31 4 74 60 12 108 120 35 92 65 16 5 530 288 942 138 180 67 82 58 13 6 265 230 196 62 149 25 75 55 11 7 213 137 79 51 136 19 68 52 9.5 8 192 130 67 50 131 18 65 50 8.8 9 107 86 25 49 132 17 68 48 8.8 10 85 75 17 47 130 17 163 85 37 11 82 73 16 59 133 21 213 150 86 12 153 112 46 92 110 27 233 120 76 13 93 126 32 98 93 25 109 83 24 14 71 120 23 81 53 12 370 218 303 15 72 115 22 62 42 7.0 179 102 49 16 64 105 18 62 41 6.9 141 72 27 17 62 90 15 135 85 31 254 130 89 18 71 79 15 134 90 33 7080 1280 51600 19 68 74 14 1010 487 2040 711 95 182 20 64 67 12 278 131 98 331 115 103 21 56 55 8.3 204 55 30 e600 e200 e818 22 58 50 7.8 122 28 9.2 el300 e325 e5450 23 161 95 41 149 40 16 e4000 e376 0180 24 100 73 20 249 92 62 el700 e361 e14300 25 73 60 12 127 35 12 e700 e67 e109 26 87 65 15 91 23 5.7 376 55 56 27 92 70 17 398 214 424 328 55 49 28 138 98 37 150 169 68 408 124 1000 29 79 65 14 167 155 70 718 319 1300 30 68 43 7.9 315 180 153 277 58 43 31 73 132 26 187 143 72 --- --- --- TOTAL 3677 1882.5 4862 3465.8 21016 83736.1 YEAR 88958 195122.7 e . Estimated I RIO GRANDE DE LOIZA BASIN 50055250 RIO CAGUITAS AT HIGHWAY 30 AT CAGUAS, 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 i: (36.5 km 2). PERIOD OF RECORD.--Water years 1972 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1988 12... 0930 E40 499 7.20 27.0 7.0 2.5 31 50 310000 72000 DEC 06... 0815 211 572 6.70 23.0 7.3 2.6 30 75 K12000 4600 FEB 1989 16... 1125 55 406 6.70 25.5 350 6.1 74 24 25000 210000 APR 10... 0900 28 500 6.90 24.0 6.1 6.4 75 46 410000 K170000 JUN 9... 1205 33 604 7.10 28.5 5.5 3.4 43 75 K120000 29000 AUG 03... 1225 18 648 7.30 30.0 9.0 2.5 33 58 K730000 620000 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SLUM, SODIUM, AD- SIUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1988 12... 150 36 37 13 33 1 5.6 150 3.3 41 37 DEC 06... 160 FEB 1989 16... 110 APR 10... 160 0 41 13 31 1 6.5 150 <0.5 37 31 JUN 09... 170 AUG 03... 150 0 39 12 51 2 6.9 180 59 55 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, OIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PEMDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 12... 0.1 32 265 72 0.37 0.13 0.50 6.20 2.3 DEC 06... 5 0.51 0.09 0.60 6.90 2.6 FEB 1989 16... 160 0.83 0.17 1.00 5.00 1.5 APR 10... 0.2 30 284 21 16 0.72 0.18 0.90 1.60 0.0 JUN 09... <1 0.51 0.09 0.60 9.70 7.3 AUG 03... 0.9 29 350 17 13 0.49 0.11 0.60 1.60 13 K = non-ideal count E estimate 187 188 RIO GRANDE DE LOIZA BASIN 50055250 RIO CAGUITAS AT HIGHWAY 30 AT CAGUAS, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (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 NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1988 12... 8.5 9.0 40 2.00 1 <100 20 1 4 10 DEC 06... 9.5 10 45 2.10 FEB 1989 16... 6.5 7.5 33 1.20 APR 10... 0.3 1.2 5.3 1.60 <1 100 80 1 4 20 JUN 9... 17 18 78 2.70 AUG 03... 15 16 69 3.70 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- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1988 12... 1300 <5 380 0.2 <1 1 50 <0.01 9 0.21 DEC 06... FEB 1989 16... APR 10... 1100 5 270 0.2 <1 1 30 <0.01 3 1.0 JUN 09... AUG 03... I RIO GRANDE DE LOIZA BASIN 50055400 RIO BAIROA NEAR CAGUAS, 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 i (2.3 km) north of Caguas plaza. DRAINAGE AREA.--5.4 mi2 (14.0 km 2 ). PERIOD OF RECORD.--Water years 1958, 1962-66, 1973-74, 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1988 12... 1.225 9.5 470 7.30 28.0 21 4.2 53 69 K600000 310000 DEC 06... 1015 4.2 429 6.90 22.0 2.0 7.5 85 45 57000 K17000 FEB 1989 17... 0830 57 200 6.30 21.0 440 8.0 89 30 K120000 280000 APR 11... 1155 4.6 359 7.20 24.5 9.8 7.7 92 29 26000 2900 JUN 13... 1110 4.3 423 8.40 27.5 1.2 9.0 113 13 20000 K230 AUG 03... 1330 3.2 446 7.80 27.5 1.1 5.8 73 17 K19000 7400 HARD- ALKA- HARD- NESS MAGNE- SODIUM ROTAS- LINITY CHLO- NESS NONCARB CALCIUM SIUM, SODIUM, AD- SIUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLO SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1988 12... 150 0 35 15 32 1 5.0 160 <0.5 29 41 DEC 06... 140 -- FEB 1989 17... 140 APR 11... 120 4 29 12 19 0.8 3.7 120 <0.5 15 23 JUN 13... 150 AUG 03... 160 13 38 15 31 1 4.5 140 22 34 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 12... 0.1 29 279 7.1 98 0.95 0.05 1.00 4.10 2.7 DEC 06... 6 1.86 0.04 1.90 0.18 0.42 FEB 1989 17... 675 0.63 0.07 0.70 0.97 4.1 APR 11... 0.2 25 198 2.5 18 0.87 0.03 0.90 0.07 0.43 JUN 13... <1 0.98 0.02 1.00 0.06 0.34 AUG 03... 0.2 31 262 2.2 <1 1.29 0.01 1.30 0.05 0.85 K non-ideal count 189 190 RIO GRANOE DE LOIZA BASIN 50055400 RIO BAIROA NEAR CAGUAS. PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 CHRO- GEN,AM- BARIUM. BORON, CADMIUM MIUM, COPPER, MONIA . NITRO- NITRO- PROS- NITRO- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN. GEM, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE (RIME ERABLE BATE (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 NO3) AS P) AS AS) AS BA) AS 8) AS CO) AS CR) AS CU) OCT 1988 12... 6.8 7.8 35 1.80 3 <100 30 1 7 20 DEC 06... 0.6 2.5 11 0.41 FEB 1989 17... 5.1 5.8 26 1.70 APR 11... 0.5 1.4 6.2 0.28 1 100 40 <1 3 <10 JUN 13... 0.4 1.4 6.2 0.33 AUG 03... 0.9 2.2 9.7 0.53 METHY- IRON, LEAD. NESE. MERCURY SILVER. ZINC. MANGA- 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- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CM) (UG/L) (MG/L) OCT 1988 12... 2200 34 190 0.6 <1 1 60 <0.01 5 0.3 DEC 06... FEB 1989 17... APR <5 <1 10 <0.01 6 0.09 11... 900 100 <0.1 <1 JUN 13... AUG 03... I I I I 191 RIO GRANDE DE LOIZA BASIN 50056400 RIO VALENCIANO NEAR JUNCOS, PR LOCATION.--Lat 18°12'58", long 65°55'34", Hydrologic Unit 21010005, on left bank at Highway 919, 0.5 i (0.8 km) upstream from Quebrada Don Victor, 1.7 i (2.7 km) upstream fro 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 i upstream, during low flow. Gage-height and precipitation satellite telemetry at station. AVERAGE DISCHARGE.--18 years (1972-89), 54.4 ft'is (1.541 m,/s), 45.04 in/yr (1,140 mm/yr), 39,410 acre-ft/yr (48.6 hm'/yr); median of yearly mean discharges, 52 ft'is (1.47 10/s), 37,700 acre-ft/yr (46 hm'/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 40,000 ft'/s (1,130 m 3/s), Dec. 8, 1987, gage height, 25.63 ft (7.812 m), from floodmark and rating curve extended above 100 ft'/s (2.83 m'/s) on basis of slope-area measurement and step-backwater analysis; minimum discharge, 1.4 ft'is (0.040 10/s), Apr. 21, 1988, result of diversion. EXTREMES OUTSIDE PERIOD OF RECORD.--Approximate discharges (no stages were recorded) of major floods are as follows: Sept. 6, 1960, 37,100 ft'/s (1,050 m'/s); Oct. 9, 1970, 18,200 ft'/s (515 m'/s). EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 3,400 ft'is (96.3 110/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (e/s) (ft) (m) Date Time (ftl/s) (m'/s) (ft) (m) Nov. 17 0345 7,140 202 11.07 3.374 Sept. 18 unknown *12,100 343 *14.46 4.407 July 5 1600 3,520 99.7 7.77 2.368 Sept. 28 2230 4,330 123 8.54 2.603 Minimum daily discharge, 8.2 ft'/s (0.232 m'/s), May 23. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 22 27 28 35 20 20 23 15 46 e9.5 14 22 2 37 36 29 27 16 e18 19 16 80 161 12 14 3 49 26 29 23 16 e17 17 16 556 38 12 24 4 404 24 27 22 16 e16 15 31 84 27 13 13 5 57 24 34 21 15 e35 14 17 34 370 12 12 6 42 25 27 20 15 e70 14 22 23 65 9.6 17 7 39 39 27 22 14 e45 15 38 19 85 9.7 16 8 37 66 26 25 17 e30 61 19 e17 48 11 15 9 62 140 25 22 14 e40 19 15 e16 27 9.1 15 10 53 42 26 37 14 e200 64 14 e15 20 9.4 22 11 47 66 25 46 13 e100 25 34 e13 17 12 48 12 45 45 24 38 12 e50 24 16 e21 106 13 62 13 73 392 26 29 12 e70 25 15 e17 24 14 38 14 39 73 23 24 13 e50 26 14 e15 19 23 61 15 66 46 22 22 17 e40 22 13 e13 33 13 51 16 46 48 24 21 33 29 19 13 e12 17 21 25 17 113 1480 71 41 185 23 18 e12 ell 17 40 31 18 52 108 32 30 114 25 16 e12 e15 17 70 e2140 19 37 55 25 28 28 22 15 e9.8 e13 e37 238 e350 20 152 52 23 29 22 65 14 ell e12 e22 73 43 21 263 46 21 25 33 28 14 e10 ell 15 35 95 22 64 52 28 21 24 22 14 e9.6 e12 13 42 194 23 65 41 29 20 19 56 14 e8.2 ell 15 42 208 24 51 38 41 19 17 29 13 8.4 ell 13 160 342 25 39 38 85 19 16 20 13 8.5 ell 21 39 82 26 32 39 37 18 208 21 13 10 e10 17 20 72 27 29 35 27 18 33 19 13 49 e10 15 142 122 28 31 33 24 17 21 17 12 29 e10 16 69 312 29 28 31 220 18 --- 16 15 21 e9.5 13 45 198 30 56 30 146 20 21 22 32 e9.5 12 50 61 31 35 --- 40 24 18 61 --- 16 34 --- TOTAL 2165 3207 1271 781 977 1232 608 599.5 1137.0 1325.5 1306.8 4705 MEAN 69.8 107 41.0 25.2 34.9 39.7 20.3 19.3 37.9 42.8 42.2 157 MAX 404 1480 220 46 208 200 64 61 556 370 238 2140 MIN 22 24 21 17 12 16 12 8.2 9.5 9.5 9.1 12 AC-FT 4290 6360 2520 1550 1940 2440 1210 1190 2260 2630 2590 9330 CFSM 4.26 6.52 2.50 1.54 2.13 2.42 1.24 1.18 2.31 2.61 2.57 9.56 IN. 4.91 7.27 2.88 1.77 2.22 2.79 1.38 1.36 2.58 3.01 2.96 10.67 CAL YR 1988 TOTAL 17471.5 MEAN 47.7 MAX 1480 MIN 3.8 AC-FT 34650 CFSM 2.91 IN. 39.63 WTR YR 1989 TOTAL :19314.8 MEAN 52.9 MAX 2140 MIN 8.2 AC-FT 38310 CFSM 3.23 IN. 43.81 e Estimated 192 RIO GRANDE DE LOIZA BASIN 50056400 RIO VALENCIANO NEAR JUNCOS, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS AUGUST 1981 TO CURRENT YEAR STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) OCT, 11 1425 41 218 27.5 APR, 03 1527 16 211 27.0 NOV, 01 1504 28 248 28.0 MAY, 01 1704 15 279 27.5 DEC, 06 1558 27 307 25.0 JUN, 06 1347 22 222 28.5 JAN, 19 -- 30 267 -- JUL, 11 1406 17 230 28.5 FEB, 09 1356 15 249 24.0 AUG, 22 1448 67 148 27.0 MAR, 02 1511 18 228 27.0 I I I 193 RIO GRANDE OE 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 i: (5.96 km2). 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.--5 years (1985-89), 4.17 ft'is (0.118 10/s), 24.62 in/yr (625 mm/yr), 3,020 acre-ft/yr (3.72 NO/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 2,740 ft'is (77.6 10/s), Nov. 26, 1987, gage height, 11.04 ft (3.365 ), from rating curve extended above 400 ft'is (11.3 10/s) on basis of indirect measurement of peak flow and step-backwater analysis; minimum discharge, 0.20 ft'is (0.006 m'/s), Feb. 10, 1987. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 500 ft'/s (14.2 '/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (10/s) (ft) (n) Date Time (ft'/s) (10/s) (ft) (m) Nov. 13 1530 512 14.5 6.79 2.070 Sept. 18 1030 *1,080 30.6 *8.20 2.499 Minimum discharge, 0.38 ft'is (0.011 m'/s), Aug. 10. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 e.90 .94 .87 1.2 1.7 .79 4.1 .83 1.1 .63 .56 .73 2 el.2 .84 .91 1.0 1.4 .77 2.1 .81 .92 8.2 .54 .66 3 e2.6 .79 .96 1.0 1.8 .76 1.5 .78 15 2.8 .50 .67 4 e10 .78 .90 1.0 1.8 .90 1.3 .77 1.7 1.2 .71 .69 5 e1.9 .76 .89 .99 1.4 .80 1.2 .74 1.0 2.8 .66 .59 6 01.6 .79 .88 .93 1.4 .94 1.1 .75 .84 2.1 .54 .58 7 e1.4 .82 .93 .93 1.4 .90 1.1 .82 .75 5.0 .48 .54 8 01.3 .82 .96 1.0 2.1 .90 1.7 .79 .71 2.3 .45 .53 9 e2.1 .78 1.1 1.0 1.6 .84 1.2 .71 .69 1.2 .42 .51 10 e1.8 .89 1.1 1.1 1.4 9.2 1.4 .71 .67 .98 .42 .74 11 el.6 .91 1.1 1.4 1.4 2.5 1.3 .80 .83 .99 1.3 2.7 12 el.5 .86 1.1 3.4 1.4 1.5 1.1 .74 .71 1.2 .92 11 13 e2.5 35 1.1 2.2 1.4 3.6 1.2 .71 .69 1.0 .56 .96 14 el.3 3.5 1.1 1.6 1.4 2.4 1.1 .69 .66 .90 .49 .96 15 e2.3 1.4 1.1 1.5 5.3 1.4 .99 .70 .62 .85 .49 .81 16 e1.6 3.0 1.2 1.6 9.8 1.1 1.0 .68 .61 .87 .45 .82 17 e3.8 18 3.0 1.7 23 .89 1.0 .65 .62 .87 .76 2.3 18 e1.7 3.1 1.2 1.5 9.2 .87 .93 .64 .63 .85 .89 235 19 el.2 1.6 .85 1.4 2.0 .82 .92 .64 .65 .76 4.2 6.3 20 e3.5 1.4 .80 1.5 1.2 1.1 .91 .63 .63 .71 15 3.6 21 e9.0 1.5 .79 1.5 1.2 1.0 .90 .60 .61 .67 6.4 17 22 e2.2 1.5 .86 1.4 .95 .99 .89 .60 .64 .74 1.3 21 23 e2.5 1.2 .83 1.4 .98 10 .86 .60 .59 2.4 4.8 53 24 e1.9 1.1 1.1 1.4 .82 2.2 .85 .60 .59 .85 17 31 25 01.5 1.4 1.8 1.4 .80 1.2 .83 .58 .61 .75 1.6 4.0 26 e1.0 1.3 1.7 1.4 1.0 1.0 .86 .73 .61 .70 1.0 3.0 27 e2.5 1.0 1.1 1.4 1.1 1.5 .84 2.2 .61 .71 1.1 2.6 28 el.4 .95 .86 1.4 .86 1.1 .82 1.4 .59 .75 .86 9.0 29 e.94 .91 5.3 1.5 --- 9.5 .91 .81 .63 .62 1.8 11 30 e2.0 .88 6.4 1.5 18 1.0 .83 .61 .57 1.4 2.8 31 1.4 --- 1.5 1.9 24 --- .90 --- .60 .86 --- TOTAL 72.14 88.72 44.29 44.15 79.81 103.47 35.91 24.44 36.12 45.57 68.46 425.09 MEAN 2.33 2,96 1.43 1.42 2.85 3.34 1.20 .79 1.20 1.47 2.21 14.2 MAX 10 35 6.4 3.4 23 24 4.1 2.2 15 8.2 17 235 MIN .90 .76 .79 .93 .80 .76 .82 .58 .59 .57 .42 .51 AC-FT 143 176 88 88 158 205 71 48 72 90 136 843 CFSM 1.01 1.29 .62 .62 1.24 1.45 .52 .34 .52 .64 .96 6.16 IN. 1.17 1.43 .72 .71 1.29 1.67 .58 .40 .58 .74 1.11 6.88 CAL YR 1988 TOTAL 1070.98 MEAN 2.93 MAX 192 MIN .27 AC-FT 2120 CFSM 1.27 IN. 17.32 WTR YR 1989 TOTAL 1068.17 MEAN 2.93 MAX 235 MIN .42 AC-FT 2120 CFSM 1.27 IN. 17.28 e Estimated 194 RIO GRANDE DE LOIZA BASIN 50056900 QUEBRADA MAMEY NEAR GURABO, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS MARCH 1984 TO CURRENT YEAR STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) OCT, 09 1410 1.9 896 APR, 06 0809 -- 432 23.0 DEC, 12 0912 1.1 626 22.5 MAY, 02 1449 .82 554 28.0 JAN, 04 -- 1.0 444 -- JUN, 08 1150 .69 525 28.0 FEB, 03 1104 1.4 546 24.0 JUL, 07 1054 2.8 393 28.5 MAR, 03 1426 .77 597 26.0 AUG, 16 0841 .45 510 26.0 MAR, 30 0932 -- 276 21.5 I I I I I 195 RIO GRANDE DE LOIZA BASIN 50057000 RIO GURABO AT GURABO, PR LOCATION.--Lat 18'15'30", long 65°58'05", Hydrologic Unit 21010005, on left bank, at bridge on Highway 181, 0.3 i (0.5 km) east of Gurabo, and 4.5 mi (7.6 km) upstream fro Rio Grande de Loiza. DRAINAGE AREA.--60.2 mi' (155.9 km 2 ). 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. Elevation of gage is 136.58 ft (41.63 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.--30 years (1960-89), 140 ft'is (3.965 m'/s), 31.58 in/yr (802 mm/yr), 101,400 acre-ft/yr (125 hm 3/yr); median of yearly mean discharges, 130 ft'is (3.68 m'/s), 94,200 acre-ft/yr (120 hoe/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 74,600 ft'/s (2,133 10/s), Sept. 6, 1960, gage height, 27.7 ft (8.44 ), from floodmark, from rating curve extended above 8,000 ft'/s (227 m'/s) on basis of slope-area measurement at gage height 21.6 ft (6.58 ), contracted opening, culvert and flow over road measurement at gage height 23.76 ft (7.242 m), 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 ft 3 /s (0.127 m'/s), 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 ). EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 3,000 ft3 /s (85.0 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft3/s) (m 3/s) (ft) (m) Date Time (ft'/s) (m'/s) (ft) (m) Oct. 21 0845 3,050 86.4 8.45 2.576 June 3 1715 6,810 193 13.29 4.051 Oct. 30 1815 3,110 88.1 8.55 2.606 Sept. 18 1115 *54,900 1,550 *25.61 7.806 Nov. 13 1830 11,600 328 16.37 4.990 Sept. 21 2030 3,180 90.1 8.66 2.640 Nov. 17 0545 6,980 198 13.48 4.109 Sept. 29 0100 5,480 155 11.77 3.587 Nov. 25 1800 3,100 87.8 8.53 2.600 Minimum daily discharge, 28 ft3/s (0.736 m'is), May 21, 22. 196 RIO GRANDE DE LOIZA BASIN 50057000 RIO GURABO AT GURABO, 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 JUL AUG SEP 1 2 3 4 5 66 73 175 e420 e250 147 167 126 102 94 64 63 63 61 64 99 80 72 66 60 67 56 53 58 50 47 46 43 42 49 126 139 67 60 48 44 52 46 62 54 205 194 1850 466 154 33 237 171 55 358 54 45 42 72 96 63 55 66 55 50 6 7 8 9 10 131 109 116 160 109 96 158 211 339 147 65 58 61 60 58 56 55 67 66 120 46 42 51 48 42 91 77 52 89 238 43 37 91 77 132 48 102 121 52 41 92 65 59 58 52 211 318 184 84 70 46 41 48 40 38 49 46 45 42 51 11 12 13 14 15 97 275 298 89 94 189 173 2230 483 165 58 56 55 52 51 203 232 151 79 67 42 38 37 40 105 82 50 162 80 60 98 59 67 111 67 345 74 55 47 41 63 53 47 43 41 60 286 79 55 67 47 99 77 99 63 262 493 103 162 165 16 17 18 19 20 e110 e150 e120 65 317 120 2390 343 173 136 55 202 114 67 56 63 83 76 67 64 217 1080 449 145 107 65 56 58 51 139 63 56 52 46 43 37 34 33 30 29 39 41 46 42 37 51 48 47 49 46 72 118 197 695 277 87 162 14700 747 394 21 22 23 24 25 951 215 174 194 149 137 176 121 98 513 49 49 68 147 182 64 51 49 46 49 96 90 63 56 50 75 49 301 102 49 42 44 42 40 36 28 28 30 29 29 37 40 38 36 37 45 44 69 49 52 155 202 179 655 214 910 662 801 1130 341 26 27 28 29 30 31 95 143 225 113 756 303 180 103 83 72 67 --- 97 56 51 786 547 137 56 61 57 55 65 60 360 124 59 --- 48 54 51 103 183 262 35 35 33 37 76 --- 31 247 205 82 89 125 38 33 31 33 33 --- 48 44 66 48 42 46 85 233 147 131 196 79 331 345 421 1210 301 --- TOTAL MEAN MAX MIN AC-FT CFSM IN. 6542 211 951 65 12980 3.51 4.04 9539 318 2390 67 18920 5.28 5.89 3552 115 786 49 7050 1.90 2.19 2439 78.7 232 46 4840 1.31 1.51 3671 131 1080 37 7280 2.18 2.27 2854 92.1 301 42 5660 1.53 1.76 1902 63.4 139 33 3770 1.05 1.18 2270 73.2 345 28 4500 1.22 1.40 4003 133 1850 31 7940 2.22 2.47 3062 98.8 358 33 6070 1.64 1.89 4542 147 695 38 9010 2.43 2.81 24249 808 14700 42 48100 13.4 14.98 CAL YR 1988 WTR YR 1989 TOTAL 50738 MEAN 139 MAX 3290 MIN 15 AC-FT 100600 CFSM 2.30 IN. 31.35 TOTAL 68625 MEAN 188 MAX 14700 MIN 28 AC-FT 136100 CFSM 3.12 IN. 42.41 e Estimated WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS AUGUST 1981 TO CURRENT YEAR DATE TIME STREAMFLOW, INSTANTANEOUS (CFS) SPECIFIC CON- DUCTANCE (UMHOS) TEMPERA- TURE (DEG C) DATE TIME STREAMFLOW, INSTANTANEOUS (CFS) SPECIFIC CON- DUCTANCE (UMHOS) TEMPERA- TURE (DEG C) OCT, 05 1150 NOV, 08 1031 DEC, 08 1125 JAN, 06 -- FEB, 08 1113 MAR, 06 1108 177 175 64 56 45 49 198 278 373 293 342 315 27.0 26.0 24.5 -- 24.5 24.5 APR, 10 1116 MAY, 08 1106 JUN, 07 0919 JUL, 05 1013 AUG, 21 1019 56 146 68 63 172 267 221 300 295 201 25.0 25.0 26.5 28.5 26.5 197 RIO GRANDE DE LOIZA BASIN 50057000 RIO GURABO 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. REMARKS.-- The suspended-sediment data included in this report is part of a 5-year hydrologic investigation conducted in the Rio Grande de Loiza Basin to account the amount of suspended- sediment transported to Lago Loiza, a water supply reservoir. EXTREMES FOR PERIOD OF DAILY RECORD.-- SEDIMENT CONCENTRATION: Maximum daily mean, 9,220 mg/L Nov 27, 1987; Minimum daily mean, 11 mg/L August 12, 1985. SEDIMENT LOADS: Maximum daily mean, 686,000 tons (622,340 tonnes) Nov 27, 1987; Minimum daily mean, 1.3 tons (1.2) July 14, 1985. EXTREMES FOR CURRENT YEAR.-- SEDIMENT CONCENTRATION: Maximum daily mean, 1,350 mg/L November 17, 1988; minimum daily mean, 14 mg/L few days. SEDIMENT LOADS: Maximum daily mean, 61,700tons (55,900 tonnes) September 18, 1989; minimum daily 1 ton (1 tonne) few 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 NOVEMBER DECEMBER 1 66 50 7.8 147 120 47 64 50 8.6 2 73 58 10 167 140 62 63 50 8.5 3 175 154 87 126 115 38 63 56 9.5 4 420 145 64 102 100 27 61 60 9.9 5 250 220 148 94 85 21 64 60 10 6 131 110 39 96 85 22 65 60 11 7 109 100 29 158 140 59 58 50 7.8 8 116 100 31 211 195 113 61 50 8.2 9 160 120 51 339 287 376 60 45 7.3 10 109 95 27 147 125 49 58 40 6.3 11 97 80 20 189 160 79 58 40 6.3 12 275 232 557 173 140 60 56 40 6.0 13 298 275 356 2230 986 19200 55 40 5.9 14 89 65 15 483 395 805 52 40 5.5 15 94 80 19 165 130 56 51 38 5.1 16 110 99 29 120 120 46 55 38 5.5 17 150 135 55 2390 1350 12600 202 159 188 18 120 110 36 343 288 315 114 120 36 19 65 48 8.3 173 160 79 67 70 12 20 317 241 549 136 120 45 56 60 8.9 21 951 680 2840 137 130 48 49 60 7.8 22 215 195 112 176 160 76 49 45 5.8 23 174 170 78 121 100 33 68 50 9.0 24 194 200 103 98 85 22 147 128 71 25 149 130 51 513 361 1660 182 169 119 26 95 90 23 180 160 78 97 80 21 27 143 128 92 103 90 25 56 40 5.8 28 225 156 154 83 65 15 51 38 5.1 29 113 100 30 72 50 9.7 786 526 2560 30 756 489 2690 67 50 9.0 547 432 939 31 303 261 278 --- --- --- 137 110 40 TOTAL 6542 8589.1 9539 36074.7 3552 4149.8 198 RIO GRANDE DE LOIZA BASIN 50057000 RIO GURABO AT GURABO--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) JANUARY FEBRUARY MARCH 1 99 80 21 67 50 8.4 47 35 4.3 2 80 70 15 56 40 5.6 46 30 3.6 3 72 50 9.5 53 30 4.1 43 25 2.8 4 66 35 6.0 58 30 4.6 42 25 2.6 5 60 30 4.8 50 30 3.9 49 25 3.0 6 56 30 4.5 46 25 3.0 91 75 18 7 55 35 5.2 42 25 2.8 77 60 12 8 67 60 11 51 30 4.2 52 40 5.4 9 66 50 8.9 48 30 3.8 89 70 16 10 120 100 33 42 25 2.8 238 206 237 11 203 180 99 42 25 2.8 82 65 14 12 232 197 145 38 25 2.6 50 40 5.4 13 151 140 58 37 25 2.4 162 130 57 14 79 75 16 40 25 2.6 80 60 13 15 67 55 10 105 100 27 60 50 8.0 16 63 55 9.9 217 196 412 65 50 8.6 17 83 55 13 1080 756 3060 56 40 6.0 18 76 50 11 449 370 604 58 40 6.2 19 67 50 9.9 145 133 62 51 38 5.1 20 64 50 9.7 107 100 26 139 116 88 21 64 45 8.5 96 90 21 75 60 12 22 51 40 5.9 90 100 22 49 35 4.4 23 49 35 4.8 63 50 11 301 221 387 24 46 35 4.5 56 40 5.9 102 80 22 25 49 35 4.6 50 25 3.3 49 38 5.1 26 56 35 5.2 360 248 824 48 32 4.1 27 61 35 5.6 124 110 36 54 35 5.0 28 57 35 5.1 59 40 6.2 51 38 4.7 29 55 40 5.5 --- --- --- 103 97 56 30 65 40 6.3 183 154 131 31 60 50 7.3 262 230 292 TOTAL 2439 563.7 3671 5174.0 2854 1439.3 199 RIO GRANDE DE LOIZA BASIN 50057000 RIO GURABO AT GURABO--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/OAY) (CFS) (MG/L) (TONS/DAY) APRIL MAY JUNE 1 126 123 52 44 30 3.5 205 150 83 2 139 134 76 52 30 4.1 194 162 127 3 67 55 10 46 30 3.6 1850 1050 12100 4 60 50 8.5 62 60 9.6 466 389 911 5 48 35 4.8 54 40 5.6 154 140 59 6 43 30 3.7 48 40 4.9 92 80 20 7 37 22 2.4 102 80 21 65 55 9.4 8 91 80 21 121 110 35 59 40 5.3 9 77 70 16 52 30 4.1 58 40 5.1 10 132 111 75 41 25 2.7 52 35 4.0 11 98 80 21 345 269 620 63 35 5.1 12 59 50 7.8 74 50 10 53 30 3.6 13 67 60 11 55 38 5.6 47 25 2.8 14 111 85 25 47 35 4.4 43 20 2.0 15 67 50 9.0 41 22 2.4 41 18 1.8 16 63 50 8.5 37 19 1.9 39 18 1.7 17 56 45 6.9 34 19 1.7 41 18 1.9 18 52 38 5.3 33 15 1.3 46 20 2.4 19 46 30 3.7 30 15 1.3 42 20 2.4 20 43 25 2.9 29 15 1.3 37 20 2.1 21 42 25 2.8 28 15 1.2 37 20 2.0 22 44 25 3.0 28 15 1.2 40 15 1.5 23 42 25 2.8 30 15 1.2 38 18 1.7 24 40 22 2.3 29 14 1.0 36 18 1.6 25 36 20 1.9 29 14 1.0 37 20 1.7 26 35 19 1.7 31 15 1.2 38 20 1.9 27 35 19 1.7 247 200 381 33 20 1.8 28 33 18 1.6 205 181 160 31 20 1.7 29 37 20 1.9 82 65 14 33 20 1.7 30 76 50 10 89 80 19 33 20 1.7 31 --- --- --- 125 110 37 --- --- --- TOTAL 1902 400.2 2270 1361.8 4003 13366.9 200 RIO GRANGE DE LOIZA BASIN 50057000 RIO GURABO AT GURABO--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) JULY AUGUST SEPTEMBER 1 33 20 1.8 54 20 2.9 63 50 8.8 2 237 183 243 45 25 3.0 55 40 6.2 3 171 161 134 42 25 2.8 66 45 8.1 4 55 40 6.0 72 80 16 55 40 6.2 5 358 539 1710 96 100 26 50 40 5.5 6 211 187 130 46 40 5.0 49 40 5.0 7 318 253 327 41 40 4.4 46 40 5.0 8 184 150 72 48 38 4.9 45 40 4.9 9 84 65 14 40 30 3.2 42 25 2.8 10 70 50 9.3 38 35 3.7 51 40 5.5 11 60 40 6.4 47 38 4.9 262 214 260 12 286 304 539 99 80 22 493 384 762 13 79 65 14 77 80 17 103 80 21 14 55 50 7.6 99 80 21 162 130 55 15 67 50 9.3 63 50 8.1 165 140 58 16 51 35 5.0 72 55 10 87 85 18 17 48 30 4.1 118 99 51 162 140 59 18 47 30 4.1 197 181 126 14700 1050 61700 19 49 50 7.0 695 499 1250 747 221 574 20 46 35 4.7 277 241 250 394 65 73 21 45 35 4.5 155 144 67 910 155 725 22 44 30 3.9 202 173 160 662 199 410 23 69 40 7.9 179 153 100 801 222 572 24 49 45 6.2 655 497 1270 1130 254 867 25 52 50 7.3 214 184 132 341 70 71 26 48 50 6.8 85 65 15 331 114 109 27 44 50 6.1 233 190 234 345 114 121 28 66 50 9.0 147 131 62 421 130 613 29 48 40 5.3 131 143 65 1210 289 1580 30 42 30 1.9 196 174 106 301 110 92 31 46 20 2.5 79 80 17 --- --- --- TOTAL 3062 3309.7 4542 4059.9 24249 185314.0 YEAR 68625 263803.1 RIO GRANDE DE 1011A BASIN 50057000 RIO GURABO AT GURABO, PR--Continued WATER QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT SED. SED. SED. DIS- SE01- SUSP. SUSP. SUSP. CHARGE, MINT, FALL FALL FALL INST. SEDI- D1S- DIAM. DIAM. DIAM. CUBIC MINT, CHARGE. PERCENT PERCENT PERCENT FEET SUS- SUS- FINER FINER FINER DATE TIME PER PENDED PENDED THAN THAN THAN SECOND (MG/L) (T/DAY) .002 MM .004 MM .008 MM SEP 1988 18... 0815 19900 4600 247158 16 28 53 NOV 1989 13... 1645 5800 2970 46510 24 49 75 SED. SED. SED. SED. SED. SED. SED. SUSP. SUSP. SUSP. SUSP. SUSP. SUSP. SUSP. FALL FALL SIEVE SIEVE SIEVE SIEVE SIEVE DIAM. DIAM. DIAM. DIAM. DIAM. D1AM. DIAM. PERCENT PERCENT PERCENT PERCENT PERCENT PERCENT PERCENT FINER FINER FINER FINER FINER FINER FINER DATE THAN THAN THAN THAN THAN THAN THAN .016 MM .031 MM .062 MM .125 MM .250 MM .500 MM 1.00 MM SEP 1988 18... 74 89 87 90 91 99.8 99.9 NOV 1989 13... 93 98 99.2 99.8 99.8 100 201 202 RIO GRANDE DE LOIZA BASIN 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 mi2 (162.7 km 2 ). PERIOD OF RECORD.--Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 DIS- OXYGEN, OXYGEN COLI- STREP­ CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1988 17... 0900 E150 281 6.30 29.0 36 5.6 72 25 K11000 2100 DEC 08... 1000 E60 348 6.60 24.0 6.7 5.8 68 13 K71000 K11000 FEB 1989 16... 1100 E82 310 6.40 22.5 88 3.9 45 19 K18000 K13000 APR 20... 0715 E30 398 6.60 25.5 15 2.8 34 26 500 450 JUN 09... 1045 E56 380 6.70 27.5 8.2 3.6 45 35 K730 340 AUG 10... 1140 E45 387 7.10 30.0 12 2.9 38 32 2200 410 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SLUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1988 17... 96 0 22 10 21 1 3.9 89 <0.5 17 19 DEC 08... 120 FEB 1989 16... 91 APR 20... 120 0 28 13 29 1 4.0 120 <0.5 15 26 JUN 09... 120 AUG 10... 120 0 27 13 29 1 4.7 120 17 27 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 17... 0.1 26 177 42 0.72 0.08 0.80 0.30 0.50 DEC 8... 19 0.83 0.07 0.90 0.35 1.30 FEB 1989 16... 9 0.61 0.09 0.70 0.46 1.0 APR 20... 0.2 30 223 32 0.91 0.09 1.00 0.27 0.73 JUN 9... <1 0.75 0.15 0.90 0.64 0.46 AUG 10... 0.2 33 223 9 0.89 0.11 1.00 0.44 0.56 K = non-ideal count E estimate RIO GRANDE DE LOIZA BASIN 50057025 RIO GURABO NEAR GURABO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (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 NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1988 17... 0.8 1.6 7.1 0.32 1 <100 100 1 4 10 DEC 08... 1.7 2.6 12 0.46 FEB 1989 16... 1.5 2.2 9.7 0.50 APR 20... 1.0 2.0 8.9 0.33 1 100 40 1 <1 10 JUN 09... 1.1 2.0 8.9 0.51 AUG 10... 1.0 2.0 8.9 0.46 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- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1988 17... 3600 13 280 0.1 <1 1 20 <0.01 <1 0.03 DEC 8... FEB 1989 16... APR 20... 1800 <5 530 <0.1 <1 <1 10 <0.01 1 0.06 JUN 9... AUG 10... 203 I I I 204 RIO GRANDE DE LOIZA BASIN 50059000 LAGO LOIZA AT DAMSITE, PR LOCATION.--Lat 18'19'49", Long 66°01'00", Hydrologic Unit 21010005, at pumpsite at damsite, and 1.9 i (3.1 km) south of Trujillo Alto plaza. DRANAIGE AREA.--208 mil (539 km 2 ). ELEVATION RECORDS PERIOD OF RECORD.--December 1987 to current year. GAGE.--Water-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 hm 3). Out flow fro 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 a), June 12, 1988. EXTREMES OBSERVED FOR CURRENT YEAR.--Maximum elevation 147.42 ft (44.93 m), Sept. 18; minimum elevation, 129.20 ft (39.38 ), Sept. 24. Capacity Table (based on data from Puerto Rico Electric Power Authority) Elevation, in feet Contents in acre-feet Elevation, in feet Contents in acre-feet 98.4 5 128.6 18 111.5 8.9 137.8 26 120.4 13 147.6 35 ELEVATION (FEET NGVD), WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 OBSERVATION AT 24:00 VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 134.40 134.41 133.92 134.03 134.26 134.45 134.97 134.41 133.73 134.13 134.38 135.00 2 134.95 134.68 134.21 134.36 134.35 134.66 133.87 134.61 134.29 135.41 133.97 134.10 3 134.62 134.42 134.63 134.67 134.47 134.83 134.49 134.76 134.04 134.42 131.59 134.44 4 134.91 134.34 134.97 134.91 134.61 135.01 134.83 134.55 133.79 134.51 132.68 134.46 5 134.65 134.65 134.38 134.24 134.69 134.71 135.07 134.78 134.33 133.60 133.20 134.39 6 134.41 135.03 134.71 134.36 134.75 134.38 134.41 135.09 134.60 135.07 133.23 134.28 7 135.06 133.70 133.87 134.72 134.84 134.85 134.57 134.95 134.77 134.81 133.21 134.20 8 134.41 134.61 134.15 134.12 134.17 134.21 134.55 134.64 134.89 133.77 133.17 134.40 9 135.00 134.05 134.43 134.52 134.37 134.76 134.92 134.74 134.95 134.01 133.11 134.30 10 134.44 134.68 134.75 134.98 134.52 133.92 133.87 134.80 134.46 134.15 133.32 134.54 11 134.79 134.42 134.57 134.96 134.57 135.20 134.53 133.95 134.66 133.96 133.91 133.82 12 134.42 134.93 134.08 134.39 134.59 134.49 135.11 134.04 134.77 134.79 134.14 134.82 13 134.42 134.50 134.29 133.89 134.65 133.94 134.54 134.09 134.80 135.06 134.30 134.29 14 134.73 134.50 134.47 134.25 134.69 134.68 135.07 134.12 134.82 134.62 134.48 134.41 15 134.42 134.64 134.67 134.51 134.33 134.53 134.40 134.12 134.83 134.67 134.51 134.91 16 134.55 134.41 134.88 134.82 135.27 134.27 134.66 134.10 134.92 134.70 134.54 132.97 17 134.42 134.42 134.07 133.90 134.74 134.95 134.88 134.06 134.49 134.70 135.06 131.22 18 134.64 134.43 134.65 134.25 134.58 133.84 135.04 134.01 134.56 134.70 135.02 A 19 134.89 134.47 134.93 134.57 134.38 134.14 135.13 133.93 134.59 134.71 134.17 A 20 134.44 133.70 134.03 134.89 134.98 134.62 134.72 133.86 134.57 134.69 134.06 A 21 134.67 134.55 134.20 134.30 134.93 134.97 134.80 133.79 134.55 134.64 135.00 130.99 22 134.70 134.42 134.48 134.59 134.50 134.90 134.87 133.69 134.52 134.73 134.06 131.22 23 134.41 134.59 134.89 134.77 134.88 134.28 134.92 133.59 134.51 135.08 135.08 132.01 24 134.78 135.12 133.96 134.93 134.35 134.74 134.96 133.47 134.46 134.58 134.56 131.40 25 134.41 134.42 135.03 134.24 134.57 135.01 134.97 133.72 134.42 134.62 135.17 133.17 26 134.80 134.41 134.33 134.54 133.69 134.26 134.99 133.80 134.55 134.68 134.36 131.33 27 134.66 134.59 134.66 134.74 134.55 133.81 135.00 134.90 134.43 134.84 133.83 131.45 28 134.44 135.09 134.92 134.86 134.87 134.09 135.00 134.57 134.34 135.05 134.49 131.88 29 134.42 134.42 134.22 134.98 134.77 134.07 134.77 134.25 135.05 134.16 134.42 30 134.42 134.80 134.30 133.94 134.74 134.32 133.96 134.18 135.01 135.30 134.05 31 134.50 134.38 134.08 134.12 134.99 135.05 134.55 MEAN 134.61 134.51 134.45 134.49 134.58 134.52 134.72 134.29 134.50 134.64 134.08 MAX 135.06 135.12 135.03 134.98 135.27 135.20 135.13 135.09 134.95 135.41 135.30 MIN 134.40 133.70 133.87 133.89 133.69 133.81 133.87 133.47 133.73 133.60 131.59 A No gage-height record RIO GRANDE DE LOIZA BASIN 205 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 (3.1 km) south of Tru- jillo Alto plaza. DRAINAGE AREA.--208 sq mi (539 sq km). PERIOD OF RECORD.--Water years 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1988 11... 1245 L 248 7.10 30.0 1.5 20 34 <120 51 DEC 06... 1130 1 230 6.40 25.0 2.7 32 51 20 40 FEB 1989 14... 1125 1 295 6.30 25.0 2.5 30 15 <10 <10 APR 10... 1110 L 239 6.30 25.5 2.5 30 25 20 170 JUN 02... 1200 L 310 6.40 26.5 3.0 36 23 76 <360 AUG 08... 0855 L 298 6.70 27.0 2.0 25 23 <320 K210 ALKA- RESIDUE NITRO- LINITY TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- GEN,AM- WAT WH AT 105 GEN, GEN, GEN, GEN, GEN, MONIA + NITRO- TOT FET SULFIDE DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, FIELD TOTAL SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL DATE MG/L AS (MG/L PENDED (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L CAC03 AS S) (MG/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) OCT 1988 11... 80 <0.5 10 0.33 0.07 0.40 0.14 0.46 0.6 1.0 DEC 06... 70 9 0.76 0.04 0.80 0.17 0.43 0.6 1.4 FEB 1989 14... 82 7 0.46 0.04 0.50 0.17 0.43 0.6 1.1 APR 10... 72 <0.5 8 0.38 0.02 0.40 0.19 0.41 0.6 1.0 JUN 02... 98 15 0.07 0.03 0.10 0.49 0.21 0.7 0.8 AUG 08... 94 18 <0.01 <0.10 0.26 0.74 1.0 MANGA- METHY- BORON, COPPER, IRON, NESE, ZINC, LENE NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL BLUE GEN, PHOROUS RECOV- RECOV- RECOV- RECOV- RECOV- CYANIDE ACTIVE TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE TOTAL PHENOLS SUB- DATE (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS NO3) AS P) AS 8) AS CU) AS FE) AS MN) AS ZN) AS CN) (UG/L) (MG/L) OCT 1988 11... DEC 06... FEB 1989 14... APR 10... JUN 02... AUG 08... 4.4 0.14 50 20 330 210 50 <0.01 <1 0.04 6.2 0.13 4.9 0.12 4.4 0.12 40 10 740 170 70 <0.01 <1 0.06 3.5 0.26 0.25 L = Lake K non-ideal count I I I 206 RIO GRANDE DE LOIZA BASIN 50059050 RIO GRANDE DE LOIZA BELOW DAMSITE, PR LOCATION.--Lat 18°20'33" , long 66°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' (541 km9. 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 except those for estimated daily discharges, which are poor. Flow regulated by Lago Loiza Dam. Gage-height and precipitation satellite telemetry at station. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 124,300 ft'/s (3,520 m'/s), Nov. 27, 1987, gage height, 39.57 ft (12.1 m), fro floodmarks and rating curve extended above 100 ft'/s (2.83 m'/s) on basis of step-back water analysis; minimum discharge, 1.6 ft'/s (0.045 '/s), July 7, 1988. EXTREMES FOR CURRENT YEAR.--Maximum discharge, 63,300 ft,/s (1,793 •'/s), Sept. 18, gage height, 31.20 ft (9.51 ), from floodmarks and rating curve extended above 100 ft'/s (2.83 43/s) on basis of step-back water analysis; minimum discharge, 3.0 ft'is (0.085 m'/s), Sept. 1. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 356 84 368 354 7.3 174 28 6.8 888 5.3 217 3.1 2 7.0 6.8 11 6.7 7.7 5.0 995 6.5 313 10 61 868 3 376 433 7.4 6.7 7.8 8.1 11 6.7 2570 376 768 97 4 1490 6.5 7.4 6.8 7.9 4.8 7.8 150 710 5.1 7.1 95 5 444 5.3 288 121 7.7 146 7.2 8.6 8.1 754 7.1 95 6 298 5.0 7.2 8.2 7.9 270 253 7.0 7.7 6.8 6.8 94 7 7.3 406 396 6.8 7.8 7.1 7.3 221 7.6 375 7.0 94 8 392 13 10 308 234 208 332 190 7.7 407 6.7 88 9 6.8 547 7.3 20 8.7 497 6.6 6.9 8.5 4.9 6.6 88 10 355 8.9 6.9 7.6 7.8 3760 315 6.9 149 4.8 6.7 92 11 7.5 484 69 391 7.7 6.0 7.2 506 6.7 289 8.1 412 12 405 12 330 573 7.7 336 5.3 7.5 5.8 6.6 6.6 137 13 562 3210 6.8 311 7.8 559 331 6.5 5.8 16 6,6 347 14 7.1 865 6.9 8.4 8.1 4.9 6.0 6.5 5.8 156 6.6 306 15 453 16 7.0 7.4 446 253 269 6.6 6.0 7.2 6.6 96 16 7.1 737 6.9 7.6 10 348 5.3 6.6 6.1 7.4 6.7 842 17 456 7620 573 399 2830 7.3 5.3 6.6 186 7.8 8.3 821 18 7.8 519 10 8.7 1550 e830 5.4 6.6 6.7 11 241 22700 19 36 544 7.1 7.1 322 e7.3 6.3 6.7 5.0 7.9 1450 5230 20 524 566 421 7.5 5.6 e5.9 135 6.6 5.0 7.4 375 851 21 1280 9.0 7.1 390 85 e4.9 7.6 6.6 4.8 7.5 8.3 1490 22 463 737 7.7 7.0 304 90 6.8 6.6 4.8 7.5 301 1580 23 401 8.8 7.3 7.0 5.8 372 6.9 6.6 4.7 7.9 6.1 2710 24 37 7.5 566 7.1 237 30 6.9 6.2 4.5 199 704 4570 25 418 1100 7.2 170 5.6 4.4 7.1 6.5 4.6 7.2 18 356 26 12 518 356 8.2 637 234 8.3 6.6 6.1 7.2 345 1150 27 430 102 7.0 7.1 7.6 419 7.1 7.5 4.8 8.2 376 738 28 600 7.1 7.2 7.1 5.8 4.0 6.9 357 4.9 8.4 6.5 291 29 1010 325 1300 7.3 --- 3.7 317 6.2 5.1 25 354 866 30 1280 7.6 1060 379 385 7.7 397 5.3 17 59 1260 31 499 --- 128 7.3 285 --- 26 --- 13 530 --- TOTAL 12627.6 18910.5 6000.4 3563.6 6787.3 9269.4 3121.0 2009.4 4958.1 2773.1 5917.4 48367.1 MEAN 407 630 194 115 242 299 104 64.8 165 89.5 191 1612 MAX 1490 7620 1300 573 2830 3760 995 506 2570 754 1450 22700 MIN 6.8 5.0 6.8 6.7 5.6 3.7 5.3 6.2 4.5 4.8 6.1 3.1 AC-FT 25050 37510 11900 7070 13460 18390 6190 3990 9830 5500 11740 95940 CFSM 1.95 3.02 .93 .55 1.16 1.43 .50 .31 .79 .43 .91 7.71 IN. 2.25 3.37 1.07 .63 1.21 1.65 .56 .36 .88 .49 1.05 8.61 CAL YR 1988 TOTAL 105652.3 MEAN 289 MAX 9750 MIN 4.9 AC-FT 209600 CFSM 1.38 IN. 18.81 WTR YR 1989 TOTAL 124304.9 MEAN 341 MAX 22700 MIN 3.1 AC-FT 246600 CFSM 1.63 IN. 22.13 e Estimated I I 207 RIO GRANDE DE LOIZA BASIN 50059100 RIO GRANDE DE LOIZA BELOW TRUJILLO ALTO, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°21'35", long 66°00'15", 100 ft (30 ) 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 i2 (552 km2 ). PERIOD OF RECORD.--Water years 1981 to current year. REMARKS: Flow controlled by Lago Loiza reservoir. WATER-QUALITY DATA. WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 DIS- OXYGEN, OXYGEN COLI- STREP­ CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1988 17... 1215 13 356 7.50 30.5 2.5 10.2 135 20 K1500 K10 DEC 23... 1245 16 290 7.30 26.0 110 6.7 82 24 25000 K14000 FEB 1989 23... 1225 E5 277 6.70 25.5 76 6.2 75 10 2100 K300 APR 21... 1245 11 302 7.30 30.0 1.5 9.3 122 17 K120 K100 JUN 20... 1205 12 336 8.50 31.0 3.0 10 132 29 K75000 K15000 AUG 08... 0810 14 312 7.40 27.0 19 5.0 62 23 29000 6800 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SIUM, SODIUM, AD- SIUM, WAT WH SULFATE RIDE, TOTAL WH WAT 01S- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1988 17... 130 0 30 13 25 1 2.9 135 <0.5 22 22 DEC 23... 98 FEB 1989 23... 85 APR 21... 110 0 26 9.9 21 0.9 2.5 98 <0.5 15 19 JUN 20... 110 AUG 08... 120 4 30 10 24 1 3.4 110 15 23 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 17... 0.1 27 219 7.6 <1 0.89 0.01 0.90 0.03 0.37 DEC 23... 84 0.67 0.03 0.70 0.08 0.52 FEB 1989 23... 24 0.97 0.03 1.00 0.07 0.33 APR 21... 0.2 24 181 5.4 6 0.38 0.02 0.40 0.05 0.35 JUN 20... 4 0.29 0.01 0.30 0.11 0.09 AUG 08... 0.3 25 198 7.2 10 0.38 0.02 0.40 0.06 0.44 K non-ideal count E . estimate 208 RIO GRANDE DE LOIZA BASIN 50059100 RIO GRANDE DE LOIZA BELOW TRUJILLO ALTO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (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 NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1988 17... 0.4 1.3 5.8 0.24 1 <100 10 <1 <1 <10 DEC 23... 0.6 1.3 5.8 0.18 FEB 1989 23... 0.4 1.4 6.2 0.19 APR 21... 0.4 0.8 3.5 0.12 1 100 40 <1 <1 <10 JUN 20... 0.2 0.5 2.2 0.13 AUG 08... 0.5 1.0 2.8 0.24 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- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1988 17... 110 <5 20 <0.1 <1 <1 <10 <0.01 1 0.05 DEC 23... FEB 1989 23... APR 21... 170 <5 40 0.1 <1 <1 <10 <0.01 17 0.06 JUN 20... AUG 08... 209 RIO GRANDE DE LOIZA BASIN 50061800 RIO CANOVANAS NEAR CAMPO RICO, PR LOCATION.--Lat 18°19'08", long 65°53'21", Hydrologic Unit 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 mil (25.48 km 2). 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. Gage-height and precipitation satellite telemetry at station. AVERAGE DISCHARGE.--22 years (1968-89), 28.8 ft3/s (0.816 40/s), 39.75 in/yr (1,010 mm/yr), 20,860 acre-ft/yr (25.7 hm3/yr); median of yearly mean discharges, 28 ft3/s (0.79 m'is), 20,300 acre-ft/yr (25 hm 3/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 15,000 ft'is (425 m'/s), Sept. 13, 1982, gage height, 13.1 ft (3.99 m), from floodmarks, from rating curve extended above 350 ft'/s (9.91 m'/s) on basis of slope-area measurements and step- backwater analysis made in 1981; minimum daily discharge, 0.80 ft'is (0.023 m 3 /s), July 24, 1977. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 2,500 ft3/s (70.8 e/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (10/s) (ft) (m) Date Time (ft 3 /s) (m 3 /s) (ft) (m) Oct. 30 1545 2,750 77.9 6.60 2.012 Sept. 18 0945 9,870 280 11.44 3.487 Nov. 13 1615 *10,400 294 *11.73 3.575 Minimum discharge, 4.1 ft'is (0.116 e/s), May 26. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 18 21 16 18 16 18 28 9.9 24 5.8 17 24 2 16 19 17 15 16 16 25 12 35 21 9.7 15 3 45 17 18 14 19 16 27 9.6 158 20 7.4 17 4 78 15 16 13 19 16 21 9.1 36 8.6 16 14 5 27 14 17 13 15 15 16 9.4 18 31 27 13 6 19 14 18 12 15 18 15 14 13 58 11 13 7 21 14 16 12 15 19 14 18 11 72 8.4 11 8 20 24 17 12 41 15 18 29 9.7 28 9.0 12 9 20 17 17 24 22 39 26 13 8.9 16 7.4 11 10 18 15 17 67 20 47 28 9.8 9.0 12 6.5 93 11 16 14 14 106 18 22 21 42 18 11 8.5 79 12 69 14 13 72 14 20 15 15 11 9.4 67 49 13 39 468 12 53 21 48 22 10 8.8 9.2 28 23 14 21 56 12 31 19 30 27 12 8.3 8.4 19 24 15 19 29 12 27 76 22 16 9.6 8.1 7.2 15 24 16 18 25 13 26 111 20 15 9.5 8.1 6.5 13 36 17 20 68 29 25 145 20 15 7.5 9.6 7.0 40 70 18 18 34 24 23 83 25 14 7.2 12 8.1 31 e1140 19 16 25 16 23 42 18 12 6.5 8.8 7.5 35 e100 20 15 32 13 27 32 15 13 6.2 7.3 6.2 18 e65 21 48 38 12 22 32 15 12 5.8 7.5 5.8 37 e58 22 22 45 16 19 27 14 11 5.3 7.8 8.8 55 41 23 29 27 28 11 25 25 11 5.4 7.0 16 45 50 24 27 21 33 17 23 18 11 5.1 6.6 11 77 12 25 28 45 26 17 21 14 11 4.8 6.0 13 31 38 26 18 31 18 29 49 13 10 5.5 6.0 8.4 20 27 27 16 25 15 24 24 12 9.9 13 5.8 8.7 19 24 28 16 20 13 17 19 11 9.4 12 5.6 16 17 122 29 62 18 41 18 --- 11 8.5 12 5.4 9.7 37 130 30 177 16 56 18 50 14 11 4.9 6.9 39 35 31 35 --- 26 17 37 --- 19 --- 12 22 --- TOTAL 1011 1221 611 828 979 679 495.8 358.2 485.2 469.8 792.9 2430 MEAN 32.6 40.7 19.7 26.7 35.0 21.9 16.5 11.6 16.2 15.2 25.6 81.0 MAX 177 468 56 106 145 50 28 42 158 72 77 1140 MIN 15 14 12 12 14 11 8.5 4.8 4.9 5.8 6.5 11 AC-FT 2010 2420 1210 1640 1940 1350 983 710 962 932 1570 4820 CFSM 3.31 4.14 2.00 2.71 3.55 2.23 1.68 1.17 1.64 1.54 2.60 8.23 IN. 3.82 4.62 2.31 3.13 3.70 2.57 1.87 1.35 1.83 1.78 3.00 9.19 CAL YR 1988 TOTAL 10828.2 MEAN 29.6 MAX 518 MIN 4.4 AC-FT 21480 CFSM 3.01 IN. 40.94 WTR YR 1989 TOTAL 10360.9 MEAN 28.4 MAX 1140 MIN 4.8 AC-FT 20550 CFSM 2.88 IN. 39.17 e Estimated 2 10 RIO GRANDE OE 1017A BASIN 50061800 RIO CANOVANAS NEAR CAMPO RICO, PR—Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS AUGUST 1981 TO CURRENT YEAR STREAMHOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCIANCE TURE ()Alf TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) OCT, 07 1306 21 188 28.0 APR, 06 1234 71 311 26.0 NOV, 03 1650 16 182 25.5 MAY, 10 1338 8.7 189 25.0 DEC, 08 1339 18 243 23.5 JUN, 09 1112 22 380 28.5 JAN, 11 1736 102 101 21.5 JUL, 12 0945 8.7 196 25.0 FEB, 03 1453 21 202 24.5 AUG, 10 1333 6.3 208 29.0 MAR. 06 1430 19 201 24.0 5EP. 07 1401 12 181 29.0 211 Drainage boundary LAS PIEDRAS EXPLANATION A0670 SURFACE-WATER STATION AND NUMBER '0725 QUALITY-OF-WATER STATION AND NUMBER O 1 f 2 3 4 8 KILOMETERS I L il I I I 0 1 2 3 4 8 MILES Figure 20.--Northeastern river basins--Rio Herrera to Rio Anton Ruiz basins. I 212 RIO ESPIRITU 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 Yunque, 0.6 mi (1.0 km) upstream fro 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 mil (2.62 ke). 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 fair. AVERAGE DISCHARGE.--6 years (1984-89), 7.64 ft'is (0.216 m'/s), 102.70 in/yr (2,608 mm/yr), 5.540 acre-ft/yr (6.83 he/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 2,230 ft'is (63.2 m'/s), Dec. 7, 1987, gage height, 9.42 ft (2.871 m) from rating curve extended above 20 ft -7s (0.57 m'/s) on basis of step-backwater analysis; minimum discharge, 0.13 ftVs (0.004 m'/s), May 26, 1989. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 500 ft 3 /s (14.2 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft 3 /s) (e/s) (ft) (m) Date Time (ft'is) (e/s) (ft) (m) Sept. 18 0915 *1,510 42.8 *8.72 2.658 No other peak greater than base discharge. Minimum discharge, 0.13 ft 3 /s (0.004 m'/s), May 26. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 1.1 1.2 1.0 6.0 2.0 1.9 49 2.8 15 .60 8.3 3.4 2 1.5 2.6 1.3 3.3 3.8 1.4 9.5 1.8 45 21 2.6 3.1 3 22 .96 1.6 2.5 6.8 1.3 8.3 1.9 63 2.4 1.1 4.4 4 13 .73 .73 2.0 2.5 1.3 3.7 4.0 7.3 9.5 4.3 1.8 5 1.2 1.5 2.2 1.7 1.2 1.1 3.4 2.1 3.9 53 2.0 1.1 6 .77 1.8 .67 1.4 3.7 3.9 2.5 2.9 2.5 17 .85 1.1 7 2.8 .84 2.7 1.5 1.3 5.8 1.7 11 1.8 54 .76 6.1 8 14 16 1.1 2.7 19 3.1 35 9.3 1.4 6.1 .68 2.4 9 5.7 5.9 1.9 8.3 6.1 26 2.7 .95 1.1 3.0 1.8 .99 10 1.9 2.0 2.6 26 4.4 7.8 20 .62 .92 1.9 6.3 33 11 .83 6.0 .90 22 2.4 2.4 4.3 .50 1.5 1.6 5.3 18 12 3.7 1.5 1.8 22 1.3 2.4 9.9 .40 .83 1.3 17 6.7 13 2.3 48 1.1 9.8 2.0 7.1 6.7 .36 .65 1.5 3.5 1.9 14 1.3 3.8 .56 4.1 1.8 7.7 2.7 16 .55 .93 1.6 24 15 .81 2.3 2.0 4.4 17 2.4 1.8 .83 .49 .73 1.5 17 16 1.7 8.0 3.5 6.7 47 4.9 4.5 .54 11 .60 1.2 14 17 3.6 28 21 6.4 58 7.3 4.0 .42 16 3.3 13 11 18 .88 5.9 3.3 3.6 23 11 1.6 .35 5.7 4.0 11 192 19 .49 5.2 1.6 5.3 13 2.4 1.4 .31 1.6 2.4 29 11 20 .63 10 1.2 10 4.6 1.7 1.1 .29 1.1 .62 9.9 11 21 18 11 1.1 9.1 5.8 1.5 .97 .24 1.2 .39 19 5.7 22 .96 3.5 8.9 3.2 3.3 1.1 .91 .21 .98 11 6.4 4.2 23 .52 1.8 7.7 2.2 5.7 1.1 .75 .19 .84 17 48 5.0 24 .86 1.2 17 2.0 5.8 1.1 .64 .16 .75 7.0 19 6.6 25 1.4 1.0 7.9 2.3 2.5 2.8 .56 .14 .66 6.6 8.1 34 26 .36 2.1 7.9 1.8 5.3 1.8 .50 8.1 .57 1.7 3.4 9.1 27 .23 8.2 4.6 2.6 6.5 .94 .44 21 .50 8.6 12 4.3 28 1.3 1.2 10 1.4 4.4 .10 .39 23 .44 12 3.1 17 29 20 .78 20 5.1 --- .80 .55 2.5 .41 1.5 25 14 30 12 .63 27 4.5 17 .97 42 .37 .93 6.1 3.7 31 2.9 --- 6.6 2.9 26 --- 11 --- 11 7.6 --- TOTAL 138.74 183.64 171.46 186.8 260.2 157.74 180.48 165.91 188.06 263.20 279.39 467.59 MEAN 4.48 6.12 5.53 6.03 9.29 5.09 6.02 5.35 6.27 8.49 9.01 15.6 MAX 22 48 27 26 58 26 49 42 63 54 48 192 MIN .23 .63 .56 1.4 1.2 .70 .39 .14 .37 .39 .68 .99 AC-FT 275 364 340 371 516 313 358 329 373 522 554 927 CFSM 4.43 6.06 5.48 5.97 9.20 5.04 5.96 5.30 6.21 8.41 8.92 15.4 IN. 5.11 6.76 6.32 6.88 9.58 5.81 6.65 6.11 6.93 9.69 10.29 17.22 CAL YR 1988 TOTAL 2675.24 MEAN 7.31 MAX 110 MIN .23 AC-FT 5310 CFSM 7.24 IN. 98.53 WTR YR 1989 TOTAL 2643.21 MEAN 7.24 MAX 192 MIN .14 AC-FT 5240 CFSM 7.17 IN. 97.35 RIO ESPIRITU SANTO BASIN 50063440 QUEBRADA SONADORA NEAR EL VERDE, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS APRIL 1983 TO CURRENT YEAR STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) OCT, 06 1127 0.74 54 22.5 APR, 05 1128 3.1 55 20.5 NOV, 03 1321 0.95 51 22.0 MAY, 11 1130 .51 52 21.0 DEC, 06 1107 0.70 108 19.5 JUN, 07 1100 2.0 60 22.0 JAN, 20 1203 14 54 19.0 JUL, 12 1247 1.4 50 23.0 FEB, 06 1030 9.1 51 19.0 AUG, 11 1238 1.5 50 23.0 MAR, 08 1127 4.6 52 19.0 SEP, 08 1104 1.9 49 22.0 213 214 RIO ESPIRITU SANTO BASIN 50063500 QUEBRADA 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 Espiritu Santo, and about 0.9 mi (1.4 km) south of El Verde. DRAINAGE AREA.--0.064 mil (0.166 km2 ). WATER-DISCHARGE RECORDS PERIOD OF 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 except those for estimated daily discharges, which are poor. AVERAGE DISCHARGE.--6 years (1984-89), 0.34 ft'/s (0.010 m 3/s), 72.14 in/yr (1,832 mm/yr), 246 acre-ft/yr (0.303 hm'/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 33 ftqs (0.93 m"/s), Mar. 15, 1987, gage height, 1.94 ft (0.591 m), from rating curve extended above 1.0 ft'/s (0.03 m'/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 ft'/s (0.37 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (W/s) (m'/s) (ft) (m) Date Time (ft'/s) (m)/s) (ft) (m) Sept. 18 0900 *19 0.54 *1.73 0.527 No other peak greater than base discharge. Minimum daily discharge, 0.05 ft'/S (0.001 m'/s), May 23, 24. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 .14 .13 .17 .19 .12 .15 1.2 .15 .39 .11 .26 .28 2 .15 .15 .16 .15 .11 .14 .43 .12 1.5 .36 .15 .28 3 .27 .12 .18 .14 .19 .14 .32 .13 2.6 .08 .12 .27 4 .28 .12 .13 .12 .15 .13 .24 .14 .68 .71 .13 .24 5 .16 .16 .12 .12 .13 .12 .18 .14 .37 1.2 .12 .21 .11 .29 .60 .11 .19 6 .13 .14 .12 .11 .12 .14 .15 7 .17 .10 .13 .11 .11 .15 .14 .23 .24 e1.4 .10 .39 8 .35 .49 .12 .14 .36 .12 .85 .23 .22 e.70 .09 .23 9 .18 .18 .13 .20 .15 .92 .19 .10 .20 e.30 .12 .19 10 .13 .14 .13 .22 .15 .46 .62 .09 .19 e.20 .15 1.2 11 .10 .25 .11 .66 .15 .20 .24 .08 .29 e.16 .12 .79 12 .15 .13 .10 .81 .10 .28 .23 .08 .18 .15 .61 .38 13 .13 1.2 .09 .28 .12 .45 .24 .07 .16 .17 .15 .27 14 .13 .36 .09 .18 .10 .35 .16 .36 .15 .14 .11 .74 15 .10 .25 .11 .19 .56 .19 .14 .08 .15 .12 .11 .70 16 .10 .29 .12 .27 1.5 .22 .15 .07 .36 .12 .10 .68 .07 .87 17 .11 1.0 .33 .23 2.6 .28 .15 .55 .19 .31 18 .09 .40 .11 .17 1.1 .23 .12 .07 .20 .16 .28 4.0 19 .08 .29 .10 .19 .55 .16 .12 .07 .15 .13 .84 1.2 20 .09 .29 .09 .30 .40 .15 .10 .06 .13 .10 .30 .67 21 .63 .33 .08 .28 .32 .14 .09 .06 .13 .09 .35 .47 22 .13 .25 .29 .16 .24 .11 .09 .06 .12 .18 .35 .37 23 .11 .22 .27 .14 .25 .13 .10 .05 .12 .53 1.4 .33 24 .12 .18 .40 .16 .27 .11 .13 .05 .11 .25 .65 .31 25 .11 .18 .24 .13 .19 .13 .12 .06 .08 .32 .40 1.1 26 .09 .22 .18 .14 .19 .10 .12 .12 .07 .14 .29 .71 27 .09 .30 .16 .14 .31 .08 .12 .30 .07 .24 .80 .38 28 .11 .17 .21 .11 .19 .08 .11 .58 .07 .39 .29 .34 29 .63 .15 .56 .14 --- .18 .12 .11 .07 .14 .94 .37 30 .39 .15 .90 .13 .57 .16 1.3 .06 .12 .45 .27 31 .18 --- .27 .12 .87 --- .49 --- .41 .31 --- 10.51 18.43 MEAN .18 .28 .20 .21 .38 .24 .24 .18 .33 .32 TOTAL 5.63 8.34 6.20 6.43 10.73 7.48 7.13 5.63 9.90 9.91 .34 .61 MAX .63 1.2 .90 .81 2.6 .92 1.2 1.3 2.6 1.4 1.4 4.0 MIN .08 .10 .08 .11 .10 .08 .09 .05 .06 .08 .09 .19 AC-FT 11 17 12 13 21 15 14 11 20 20 21 37 CFSM 3.03 4,63 3.33 3.46 6.39 4.02 3.96 3.03 5.50 5.33 5.65 10.2 IN. 3.49 3.84 6.65 4.42 6.14 6.52 5.17 3.99 4.64 3.49 6.14 11.43 CAL YR 1988 TOTAL 110.59 MEAN .30 MAX 3.6 MIN .05 AC-FT 219 CFSM 5.04 IN. 68.57 WTR YR 1989 TOTAL 106.32 MEAN .29 MAX 4.0 MIN .05 AC-FT 211 CFSM 4.85 IN. 65.92 e Estimated 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, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) OCT, 06 1344 0.13 109 23.5 APR, 05 1329 0.18 102 21.5 NOV, 03 1003 0.11 107 22.0 MAY, 11 1241 0.08 113 22.2 DEC, 06 1239 0.11 162 21.0 JUN, 07 1230 0.22 100 23.0 JAN, 11 1311 1.0 75 20.5 JUL, 12 1414 0.14 101 23.5 FEB, 06 1146 0.13 109 20.5 AUG, 10 1020 0.17 103 23.5 MAR, 08 1306 0.13 105 20.5 SEP, 08 1226 0.22 98 23.5 215 I I 216 RIO ESPIRITU SANTO BASIN 50063800 RIO ESPIRITU SANTO NEAR RIO GRANDE, PR LOCATION.--Lat 18°21'37", long 65°48'49", Hydrologic Unit 21010005, at left abutment, on downstream side of bridge on Highway 966, 0.1 i (0.2 km) upstream fro quebrada Jimenez, and 1.9 mi (3.1 km) southeast of Rio Grande. DRAINAGE AREA.--8.62 mil (22.33 km 2 ). 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.--23 years (1967-89), 59.7 ft'/s (1.691 m'/s), 94.05 in/yr (2,389 mm/yr), 43,250 acre-ft/yr (53.3 hm 3/yr); median of yearly mean discharges, 54 ftqs (1.53 01/s), 39,100 acre-ft/yr (48 hm'/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 20,000 ft'is (566 m'/s), Dec. 7, 1987, gage height, 14.52 ft (4.426 m), from rating curve extended above 600 ft'/s (17.0 m'/s) on basis of step-backwater analysis; minimum discharge. 4.0 ftqs (0.113 e/s), July 3-5, 1975, Apr. 14, 15, 1984. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 3,000 ft'is (85.0 m 3/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft3/s) (e/s) (ft) (m) Date Time (ft'/s) (m3/s) (ft) (m) Nov. 13 1630 5,980 169 9.20 2.804 July 7 1445 4,780 135 8.49 2.588 Feb. 16 2115 3,930 111 7.91 2.411 Sept. 18 0930 *17,200 487 *13.69 4.173 June 3 1500 3,310 93.7 7.45 2.271 Minimum discharge, 14 ft'is (0.396 e/s), May 24-26. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 19 25 28 53 32 27 406 37 143 21 94 74 2 20 43 33 35 42 23 93 29 371 148 48 61 3 150 23 38 30 64 22 88 32 520 55 28 92 4 164 21 27 27 46 22 49 47 111 53 59 46 5 34 25 43 25 31 22 59 53 63 436 44 35 6 38 38 28 23 40 44 36 81 46 155 24 35 7 48 24 36 24 28 45 25 81 39 572 24 66 8 91 152 33 41 119 38 212 107 35 111 26 53 9 71 98 35 73 45 193 45 28 32 50 22 31 10 36 33 39 152 53 120 145 23 30 37 82 284 11 23 65 28 195 36 37 52 22 43 32 58 225 12 62 30 27 219 25 31 86 20 30 30 232 105 13 53 537 25 84 30 99 63 19 27 32 51 43 14 37 85 22 40 25 56 41 110 26 26 30 188 15 28 46 32 37 125 32 37 25 25 24 50 192 16 32 105 44 54 499 41 54 20 81 25 31 104 17 45 232 151 60 616 63 52 19 149 35 156 161 18 28 94 42 40 197 86 37 18 96 58 121 2180 19 22 70 24 47 105 33 33 19 33 37 278 173 20 21 101 21 105 56 25 31 20 27 24 107 213 21 178 113 21 74 56 25 29 18 28 21 156 95 22 30 79 73 35 41 21 34 16 26 76 94 67 23 24 42 97 27 53 22 27 15 24 170 305 79 24 25 34 142 25 53 21 24 15 22 80 176 87 25 38 35 80 28 33 28 23 15 22 86 102 373 26 24 37 60 25 46 24 22 60 20 34 47 143 27 20 96 53 33 69 19 21 156 20 83 102 76 28 37 34 64 24 48 16 20 179 18 124 45 190 29 201 28 139 44 --- 49 20 43 18 33 265 189 30 169 25 214 45 206 28 401 17 25 108 63 31 49 --- 67 39 263 --- 156 --- 101 88 --- TOTAL 1817 2370 1766 1763 2613 1753 1892 1884 2142 2794 3053 5723 MEAN 58.6 79.0 57.0 56.9 93.3 56.5 63.1 60.8 71.4 90.1 98.5 191 MAX 201 537 214 219 616 263 406 401 520 572 305 2180 MIN 19 21 21 23 25 16 20 15 17 21 22 31 AC-FT 3600 4700 3500 3500 5180 3480 3750 3740 4250 5540 6060 11350 CFSM 6.80 9.16 6.61 6.60 10.8 6.56 7.32 7.05 8.28 10.5 11.4 22.1 IN. 7.84 10.23 7.62 7.61 11.28 7.57 8.17 8.13 9.24 12.06 13.18 24.70 983 MIN 11 AC-FT 44920 CFSM 7.18 IN. 97.74 WTR YR 1989 TOTAL 29570 MEAN 81.0 MAX 2180 MIN 15 AC-FT 58650 CFSM 9.40 IN. 127.61 CAL YR 1988 TOTAL 22649 MEAN 61.9 MAX 217 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 1988 TO SEPTEMBER 1989 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1988 13... 1050 40 61 7.60 24.5 5.2 8.7 104 17 K1300 K1200 DEC 07... 0900 25 111 6.40 22.0 1.6 8.7 99 11 K600 2100 FEB 1989 13... 0845 26 108 6.30 21.0 1.7 8.2 90 11 500 220 APR 14... 0900 41 81 6.20 21.0 2.5 8.7 97 <10 240 2800 JUN 02... 0825 251 58 6.00 22.5 28 10.3 118 19 9300 5900 AUG 09... 1125 21 108 7.50 26.0 1.7 7.4 89 17 K850 740 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LIN1TY CHLO- NESS NONCARB CALCIUM SIUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1988 13... 24 1 5.1 2.8 6.2 0.6 0.7 22 <0.5 5.6 8.5 DEC 07... 34 FEB 1989 13... 28 APR 14... 24 0 5.3 2.7 6.7 0.6 0.5 19 <0.5 1.7 9.4 JUN 02... 13 AUG 09... 41 4 9.6 4.2 8.9 0.6 0.7 38 2.0 9.7 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 13... <0.1 13 56 6.1 4 <0.01 0.10 0.03 0.27 DEC 07... 3 <0.01 <0.10 0.01 0.29 FEB 1989 13... 6 <0.01 <0.10 0.02 0.28 APR 14... 0.1 14 55 6.0 3 <0.01 <0.10 0.02 0.18 JUN 02... 24 <0.01 <0.10 0.01 0.39 AUG 09... <0.1 20 77 4.3 10 <0.01 <0.10 0.03 0.17 K = non-ideal count 218 RIO ESPIRITU SANTO BASIN 50063800 RIO ESPIRITU SANTO NEAR RIO GRANDE. PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (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 NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1988 13... 0.3 0.4 1.8 <0.01 <1 <100 <10 <1 2 <10 DEC 07... 0.3 <0.01 FEB 1989 13... 0.3 0.01 APR 14... 0.2 <0.01 <1 100 20 <1 2 <10 JUN 02... 0.4 0.02 AUG 09... 0.2 0.03 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- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) MANGA- OCT 1988 13... 370 <5 20 <0.1 <1 <1 10 <0.01 0.03 2 DEC 07... FEB 1989 13... APR 14... 290 <5 10 <0.1 <1 <1 <10 <0.01 <1 0.03 JUN 02... AUG 09... 219 RIO MAMEYES BASIN 50065500 RIO MAMEYES NEAR SABANA, PR LOCATION.--Lat 18°19'46", long 65°45'04", 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 mil (17.82 km 2). 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. Gage-height and precipitation satellite telemetry at station. AVERAGE DISCHARGE.--12 years (1968-73, 1984-89), 59.0 ft'is (1.671 m'/s), 116.46 in/yr (2,958 mm/yr), 42,740 acre-ft/yr (52.7 hm 3/yr); median of yearly mean discharges, 59 ft'/s (1.67 e/s), 42,700 acre-ft/yr (53 he/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 20,500 ft'/s (580 e/s), Sept. 18, 1989, gage height, 13.19 ft (4.020 m), from rating curve extended above 1,800 ft'is (51.0 e/s) on basis of slope-area measurement of peak flow; minimum discharge, 5.1 ft'/s (0.144 e/s), Apr. 8, 9, 1970. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 4,000 ft'/s (113 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (m 3/s) (ft) (m) Date Time (W/s) (e/s) (ft) (m) Nov. 13 1615 5,030 142 8.02 2.444 Sept. 18 0915 *20,500 580 *13.19 4.020 July 7 1400 9,100 258 9.84 2.999 Minimum daily discharge, 14 ftl/s (0.396 e/s), May 25. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 e20 31 19 e35 e25 38 323 42 132 27 79 33 2 e22 35 24 e30 e34 34 69 33 439 131 76 41 3 e60 27 34 e28 49 33 68 37 245 44 57 47 4 e80 32 22 e27 36 30 44 51 64 84 102 29 5 e40 42 59 e26 25 27 58 41 42 292 34 25 6 34 41 24 e25 30 45 35 71 44 58 25 25 7 52 33 e34 e25 23 44 27 87 45 457 37 26 8 127 152 e27 e27 80 34 85 96 46 60 23 26 9 133 57 e27 e25 35 64 33 26 48 38 41 25 10 106 54 e24 e90 40 62 124 22 47 35 68 77 11 45 86 e22 146 27 34 49 20 46 40 62 86 12 63 38 e21 149 21 44 68 19 43 34 46 54 13 60 339 e24 e75 25 60 58 18 40 34 36 33 14 50 78 e22 e32 25 77 37 90 38 29 19 127 15 35 46 e25 e28 74 41 31 21 37 37 21 132 16 43 48 e40 e30 120 48 36 19 120 31 17 67 17 62 148 e55 e40 221 51 32 18 85 50 62 76 18 34 63 e25 e30 146 75 26 18 56 65 38 2780 19 35 49 e22 e32 87 38 25 19 28 49 161 161 20 41 84 e20 e50 49 30 22 19 25 30 89 161 21 194 117 e19 e30 53 38 23 19 38 24 102 85 22 50 60 e45 e28 39 36 25 17 33 68 103 61 23 34 37 e40 e27 52 27 29 17 39 94 188 66 24 102 28 e50 e26 54 28 33 15 33 39 142 91 25 66 62 e30 e25 44 51 30 14 78 42 85 178 26 44 33 e25 e25 87 62 29 102 30 34 54 108 27 31 74 e24 e30 69 52 29 152 29 51 87 68 28 74 26 e26 e25 57 39 30 128 29 80 48 96 29 132 22 e24 e35 --- 46 34 48 27 46 131 128 30 71 20 el20 e30 157 36 248 26 44 51 55 31 43 --- e50 e26 92 --- 126 --- 80 47 --- TOTAL 1983 1962 1023 1257 1627 1537 1548 1653 2032 2227 2131 4967 MEAN 64.0 65.4 33.0 40.5 58.1 49.6 51.6 53.3 67.7 71.8 68.7 166 MAX 194 339 120 149 221 157 323 248 439 457 188 2780 MIN 20 20 19 25 21 27 22 14 25 24 17 25 AC-FT 3930 3890 2030 2490 3230 3050 3070 3280 4030 4420 4230 9850 CFSM 9.30 9.51 4.80 5.89 8.45 7.21 7.50 7.75 9.84 10.4 9.99 24.1 IN. 10.72 10.61 5.53 6.80 8.80 8.31 8.37 8.94 10.99 12.04 11.52 26.86 CAL YR 1988 TOTAL 20136 MEAN 55.0 MAX 731 MIN 12 AC-FT 39940 CFSM 8.00 IN. 108.87 WTR YR 1989 TOTAL 23947 MEAN 65.6 MAX 2780 MIN 14 AC-FT 47500 CFSM 9.54 IN. 129.48 e Estimated 220 RIO MAMEYES BASIN 50065500 RIO MAMEYES NEAR SABANA, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS JUNE 1983 TO CURRENT YEAR DATE TIME STREAMFLOW, INSTANTANEOUS (CFS) SPECIFIC CON- DUCTANCE (UMHOS) TEMPERA- TURE (DEG C) DATE TIME STREAMFLOW, INSTANTANEOUS (CFS) SPECIFIC CON- DUCTANCE (UMHOS) TEMPERA- TURE (DEG C) OCT, 05 1131 NOV, 02 1525 DEC, 05 1431 JAN, 10 1427 FEB. 02 1215 AUG, 09 0915 36 36 72 119 42 24 89 92 140 75 84 99 23.5 24.0 21.5 21.0 20.5 24.0 MAR, 06 1115 APR, 04 1007 MAY, 10 1033 JUN, 06 0923 JUL, 11 0925 SEP, 07 1029 89 42 22 45 43 26 94 83 22 89 98 100 21.0 21.5 22.0 23.5 23.5 24.5 --- 221 RIO SABANA BASIN 50067000 RIO SABANA AT SABANA, PR LOCATION.--Lat 18'19'52", long 65°43'52', Hydrologic Unit 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 mil (10.26 km2 ). 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 41). 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.--10 years (1980-89). 20.3 ft'/s (0.575 10/s), 69.61 in/yr (1,768 mm/yr), 14,710 acre-ft/yr (18.14 hm'/yr); median of yearly mean discharges, 20.4 ft'/s (0.578 10/s), 14,800 acre-ft/yr (18.2 he/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 9,010 ft'/s (255 m'/s), Apr. 21, 1983, gage height, 19.35 ft (5.898 m), from floodmark, from rating curve extended above 200 ft'/s (5.66 10/s) on basis of step-backwater analysis and slope-area measurement; minimum discharge, 0.86 ft'is (0.024 m'/s), Apr. 17, 1983. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,500 ft'is (42.5 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (10/s) (ft) (m) Date Time (ft'/s) (m'/s) (ft) (m) Nov. 13 1600 1,690 47.9 12.43 3.789 July 7 1345 5,850 166 16.99 5.178 Feb. 2 0145 1,610 45.6 12.31 3.752 Sept. 18 1045 *8,170 231 *18.77 5.721 July 5 1115 1,590 45.0 12.28 3.743 Minimum discharge, 1.8 ft'/s (0.05 e/s). May 21-26. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 7.8 e5.0 4.3 9.4 5.3 7.0 30 3.7 e106 3 1 6.6 11 2 7.8 16 5.6 7.6 8.3 6.0 11 3.3 e208 108 6.7 13 3 50 7.2 5.6 6.9 11 5.7 6.1 4.2 50 16 4.8 18 4 70 13 4.3 6.4 7.1 5.4 4.9 8.5 15 34 68 8.4 5 12 25 9.7 6.0 4.9 5.3 9.4 4.5 8.7 256 11 8.1 6 9 0 13 4.4 5.5 4.9 7.1 6.1 9.4 6.3 35 5.3 7.7 7 17 8.0 5.1 5.7 5.3 6.3 4.5 26 5.1 304 5.8 7.8 8 26 83 4.1 6.2 16 6.4 11 e103 4.7 24 5.0 7.2 9 176 17 4.7 5.8 6.2 32 5.9 3.7 4.3 13 8.2 7.3 10 139 14 4.1 21 6.6 60 60 2.7 4.1 9.8 9.6 15 11 15 34 3.3 47 5.2 11 10 2.3 4.4 8.8 69 18 12 12 10 3.2 111 4.3 20 21 2.1 3.7 7.8 16 8.9 13 16 146 4.7 22 5.1 36 7.3 4.4 3.4 7.8 8.6 6.6 14 16 22 3.1 9.1 4.7 66 5.3 12 3.4 7.2 5.6 110 15 8.5 9 1 4.8 7.4 10 12 4.5 2.4 3.2 6.6 5.7 68 16 9.3 7 5 13 9.8 47 7.8 4.5 2.1 42 6.6 5.3 13 24 17 9.1 31 23 15 215 23 4.6 2.0 15 9.6 16 2.1 e887 18 7.5 14 6.7 7.9 92 32 4.2 14 11 16 19 9.6 10 3.5 8.6 20 8.4 4.6 2.0 4.5 8.0 116 e76 20 7.8 10 2.9 18 12 7.1 3.9 2.0 3.7 5.9 9.7 37 21 92 28 2.7 8.4 11 6.2 4.0 1.9 4.9 5.2 7.8 27 22 11 14 11 6.8 7.8 8.8 4.9 1.9 3.7 10 105 23 20 24 21 6.2 17 6.0 15 6.0 3.5 1.9 3.3 9.2 33 29 25 16 11 7.5 5.6 7.5 9.0 3.3 1.9 27 5.9 11 92 23 9.4 7.6 11 6.0 9.6 6.6 4.2 1.9 3.4 14 63 9.0 26 9.5 6.4 4.9 6.0 14 7.0 3.6 11 4.9 4.8 48 27 7.9 7.2 4.9 8.0 24 5.0 3.0 21 3.3 5.3 15 24 28 41 5.2 5.9 5.1 16 4.6 3.1 9.4 3.1 14 8.4 18 29 e85 4.7 4.5 11 --- 4.6 2.9 3.3 3.0 4.8 85 39 30 e30 4.4 58 6.0 50 3.1 e90 2.8 4.6 26 16 31 ell --- 12 5.7 8.4 --- e150 --- 9.8 11 TOTAL 959.2 589.5 259.5 410.9 595.8 480.7 254.4 496.6 568.9 969.8 773.1 1688.0 MEAN 30.9 19.6 8.37 13.3 21.3 15.5 8.48 16.0 19.0 31.3 24.9 56.3 MAX 176 146 58 111 215 66 60 150 208 304 116 887 MIN 7.5 4.4 2.7 5.1 4.3 4.6 2.9 1.9 2.8 3.1 4.8 6.6 AC-FT 1900 1170 515 815 1180 953 505 985 1130 1920 1530 3350 CFSM 7.81 4.96 2.11 3.35 5.37 3.92 2.14 4.05 4.79 7.90 6.30 14.2 IN. 9.01 5.54 2.44 3.86 5.60 4.52 2.39 5.34 9.11 7.26 4.67 15.86 CAL YR 1988 TOTAL 7577.8 MEAN 20.7 MAX 376 MIN 2.4 AC-FT 15030 CFSM 5.23 IN. 71.19 WTR YR 1989 TOTAL 8046.4 MEAN 22.0 MAX 887 MIN 1.9 AC-FT 15960 CFSM 5.57 IN. 75.59 e Estimated 222 RIO SABANA BASIN 50067000 RIO SABANA AT SABANA, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS AUGUST 1981 TO CURRENT YEAR STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) OCT, 05 1429 9.7 104 25.0 APR. 04 1245 5.2 114 24.0 NOV, 02 1216 20 82 24.5 MAY, 09 1231 3.6 113 24.0 DEC, 05 1717 21 140 22.5 JUN, 06 1202 6.7 112 25.5 JAN, 09 1535 5.4 127 23.0 JUL, 10 1350 8.9 92 26.0 FEB, 02 1422 7.2 101 22.5 AUG, 09 1159 4.8 116 25.5 MAR, 07 1328 6.2 110 22.5 SEP, 06 1707 7.3 113 27.0 I I I I I I I I I RIO FAJARDO BASIN 223 50071000 RIO FAJARDO NEAR FAJARDO, PR LOCATION.--Lat 18'17'56*. long 65'41'42', Hydrologic Unit 21010005. on left bank off Highway 976, 0.1 •i (0.2 k•) upstream fro Highway 977 bridge, 0.3 mi (0.5 km) downstream from Quebrada Penon. 1.1 i (1.8 km) northeast of Colonia Paraiso, and 3.3 mi (5.3 ka) southwest of Fajardo. DRAINAGE AREA.--14.9 i' (38.6 km'). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--1960-61 (occasional low and peak-flow measurements only), March 1961 to current year. GAGE.--Water-stage recorder. Elevation 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 ); May 6, 1969 to Mar. 16. 1972. 135.05 ft (41.163 ); 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 • upstream from gaging station (estimated mean daily discharges is 9.0 ft'/s (0.255 m'/s). AVERAGE DISCHARGE.--28 years (1962-89), 69.8 ft'/s (1.977 •'/s), 63.61 in/yr (1.616 m/yr), 50,570 acre-ft/yr (62.4 hs'/yr); median of yearly mean discharges, 69 ft'/s (1.95 '/s), 50,000 acre-ft/yr (62 hil0/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge. 23.500 ftys (665 al/s). Sept. 18. 1989. gage height. 20.00 ft (6.096 m), datum then in use. fro rating curve extended above 100 ft'/s (2.83 m'/s) on basis of step-backwater analyses. slope-area measurements, and contracted opening of peak discharges; minimum discharge. 0.86 ft'/s (0.024 '/s), May 3, 1984. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 3,500 ft'/s (99.1 mi/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (fta/s) (0/s) (ft) (m) Date Time (ft'/s) (•'/s) (ft) (m) Nov. 13 1645 4,980 141 9.11 2.776 Aug. 4 1645 4.870 138 9.02 2.749 July 7 1415 10,800 306 13.07 3.984 Sept. 18 unknown *23,500 666 •20.00 6.096 Minimum discharge. 1.7 ft'/s (0.05 10/s), May 24. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 21 82 26 44 27 23 163 9.8 389 9.5 24 48 2 20 178 33 33 29 20 45 9.1 627 232 19 51 3 101 39 30 29 39 22 34 21 296 69 15 68 4 442 42 25 26 29 19 30 49 58 100 377 33 5 43 35 120 24 23 19 26 10 26 646 56 28 6 37 34 35 22 24 49 17 22 14 278 22 27 7 42 33 33 22 19 29 12 41 9.4 1160 19 25 8 108 254 30 27 59 21 32 209 8.0 116 18 25 9 583 46 30 32 24 23 20 13 8.7 52 20 28 10 401 36 27 90 26 50 197 7.3 6.6 45 97 131 11 62 59 24 64 20 22 46 6.6 19 29 272 106 12 63 40 31 357 20 27 162 4.5 7.8 23 62 72 13 138 629 35 79 22 64 125 5.2 6.9 21 71 32 14 72 80 25 42 23 85 41 133 6.6 20 25 196 15 42 47 26 36 43 39 26 13 7.9 23 24 240 16 41 42 44 51 71 55 22 7.3 37 17 20 89 17 48 144 95 68 441 29 21 5.3 45 16 78 118 18 35 50 38 36 154 38 15 4.7 50 32 106 e8800 19 49 39 30 32 97 22 13 4.1 27 16 150 e1520 20 43 50 28 35 42 19 11 4.1 16 14 36 e219 21 505 209 23 30 65 22 15 3.6 27 13 45 e129 22 55 87 49 26 35 21 16 3.0 15 23 255 e86 23 41 45 154 27 50 18 11 3.6 22 92 130 e82 24 106 37 181 23 44 17 8.6 2.6 13 25 154 e60 25 57 57 81 23 28 21 7.2 2.7 140 17 61 e49 26 37 38 42 28 37 17 6.8 295 26 14 38 e42 27 39 49 46 30 36 15 6.1 499 12 14 118 33 28 89 32 31 22 34 13 5.4 305 9.8 44 42 60 29 123 28 87 36 --- 14 5.1 38 8.5 13 314 204 30 87 26 297 29 130 6.8 398 7.9 11 114 32 31 48 --- 53 29 46 --- 447 --- 76 55 --- TOTAL 3578 2567 1809 1452 1561 1009 1146.0 2576.5 1947.1 3260.5 2837 12633 MEAN 115 85.6 58.4 46.8 55.7 32.5 38.2 83.1 64.9 105 91.5 421 MAX 583 629 297 357 441 130 197 499 627 1160 377 8800 MIN 20 26 23 22 19 13 5.1 2.6 6.6 9.5 15 25 AC-FT 7100 5090 3590 2880 3100 2000 2270 5110 3860 6470 5630 25060 CFSM 7.75 5.74 3.92 3.14 3.74 2.18 2.56 5.58 4.36 7.06 6.14 28.3 IN. 8.93 6.41 4.52 3.63 3.90 2.52 2.86 6.43 4.86 8.14 7.08 31.54 CAL YR 1988 TOTAL 24436 MEAN 66.8 MAX 1010 MIN 11 AC-FT 48470 CFSM 4.48 IN. 61.01 WTR YR 1989 TOTAL 36376.1 MEAN 99.7 MAX 8800 MIN 2.6 AC-FT 72150 CFSM 6.69. IN. 90.82 e Estimated 224 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 1988 TO SEPTEMBER 1989 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITV SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1988 03... 0915 87 85 7.20 25.0 12 6.9 83 15 4900 42000 DEC 5... 0915 91 111 6.40 23.0 27 8.4 97 45 24000 24000 FEB 1989 6... 0845 20 126 6.20 22.5 4.3 8.4 96 11 120 760 APR 03... 0850 32 109 6.60 23.0 2.9 9.8 113 <10 K900 K1600 JUN 01... 0840 128 99 6.20 22.5 18 9.0 103 19 2500 4700 JUL 31... 0915 23 125 7.20 26.0 7.0 8.0 98 12 K1800 4900 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- UNITY CHLO- NESS NONCARB CALCIUM SIUM, SODIUM, AD- SIUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS CAC03) MG/L AS CAC03 (MG/L AS CA) (MG/L AS MG) (MG/L AS NA) RATIO (MG/L AS K) MG/L AS CAC03 (MG/L AS S) (MG/L AS SO4) (MG/L AS CL) OCT 1988 03... 20 0 4.4 2.3 7.4 0.7 1.2 20 <0.5 7.1 9.0 DEC 5... 28 FEB 1989 6... 32 APR 03... 30 0 6.4 3.4 9.6 0.8 1.1 30 <0.5 6.4 11 JUN 01... 16 JUL 31... 35 0 7.9 3.8 12 0.9 2.1 33 4.0 11 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEM, GEN, GEN, GEM, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 03... 0.1 16 60 14 20 0.19 0.01 0.20 0.02 0.58 DEC 5... 24 0.28 0.02 0.30 0.02 0.38 FEB 1989 6... 9 0.27 0.03 0.30 0.04 0.36 APR 03... 0.1 22 80 7.0 <1 <0.01 0.20 0.05 JUN 01... 4 0.19 0.01 0.20 0.03 0.37 JUL 31... 0.1 24 86 5.4 18 0.19 0.01 0.20 0.02 0.18 K = non-ideal count RIO FAJARDO BASIN 225 50071000 RIO FAJARDO NEAR FAJARDO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (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 NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1988 03... 0.6 0.8 3.5 0.03 <1 <100 30 1 9 10 DEC 5... 0.4 0.7 3.1 0.04 FEB 1989 6... 0.4 0.7 3.1 0.02 APR 03... <0.2 0.03 <1 100 <10 <1 <1 <10 JUN 01... 0.4 0.6 2.7 0.04 JUL 31... 0.2 0.4 1.8 0.03 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- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1988 03... 1900 <5 50 <0.1 <1 <1 80 <0.01 4 0.05 DEC 5... FEB 1989 6... APR 03... 320 <5 30 <0.1 <1 <1 20 <0.01 6 0.03 JUN 01... JUL 31... PESTICIDE ANALYSES CHLOR- DI- DI- ENDO- PCB, ALDRIN, DANE, ODD, DOE, DDT, AZINON, ELDRIN SULFAN, DATE 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) JUN 01... 0840 <0.1 <0.01 <0.1 <0.01 <0.01 <0.01 0.6 <0.01 <0.01 HEPTA- METH- METHYL METHYL HEPTA- CHLOR MALA- OXY- PARA- TRI- ENDRIN. ETHION, CHLOR, EPDXIDE LINDANE THION, CHLOR, THION, THION. MIREX, DATE 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) JUN 01... <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 NAPH- THA- LENES, PARA- POLY- PER- TOX- TOTAL THION, CHLOR. THANE APHENE, TRI- 2,4-0, 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) JUN 01... <0.01 <0.1 <0.1 <1 <0.01 <0.01 <0.01 <0.01 <0.01 226 RIO FAJARDO BASIN 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 mil (60.6 km2 ). PERIOD OF RECORD.--Water years 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- 01S- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITV SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1988 26... 0940 55 147 6.60 26.0 4.5 8.3 102 17 2100 250 DEC 5... 1205 108 139 6.40 24.0 51 8.0 94 44 5300 7700 FEB 1989 6... 1105 25 168 6.40 24.0 4.6 8.1 94 <10 K890 K110 APR 3... 1130 36 139 6.70 25.5 18 8.8 105 <10 K1000 450 JUN 01... 1135 151 112 6.20 24.0 28 7.7 90 18 47000 24000 AUG 4... 0850 27 156 6.80 28.5 17 5.9 76 <10 4900 K19000 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB - CALCIUM SIUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1988 26... 40 1 9.1 4.1 12 0.9 2.1 37 <0.5 5.8 16 DEC 5... 34 FEB 1989 6... 35 APR 3... 38 2 8.7 4.0 12 0.9 1.2 35 <0.5 6.7 16 JUN 01... 20 AUG 4... 35 2 8.7 3.3 12 0.9 1.6 35 10 12 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 26... 0.1 22 95 14 <1 <0.01 0.30 0.03 0.17 DEC 5... 28 0.28 0.02 0.30 0.04 0.36 FEB 1989 6... 6 0.07 0.03 0.10 0.08 0.52 APR 3... 0.1 19 89 8.7 24 <0.01 0.20 0.07 JUN 01... 13 0.38 0.02 0.40 0.05 0.35 AUG 4... 0.1 18 85 6.3 14 <0.01 <0.10 0.08 0.62 K = non-ideal count RIO FAJARDO BASIN 50072500 RIO FAJARDO BELOW FAJARDO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA 4- NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (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 NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1988 26... 0.2 0.5 2.2 0.03 1 100 50 <1 <1 <10 DEC 5... 0.4 0.7 3.1 0.04 FEB 1989 6... 0.6 0.7 3.1 0.02 APR 3... <0.2 0.03 <1 100 20 2 1 <10 JUN 01... 0.4 0.8 3.5 0.06 AUG 4... 0.7 0.07 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- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS P8) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1988 26... 420 <5 40 <0.1 <1 <1 <10 <0.01 2 0.02 DEC 5... FEB 1989 6... APR 3... 1200 <5 80 <0.1 <1 <1 <10 <0.01 6 0.03 JUN 01... AUG 4... 227 I I 228 RIO BLANCO BASIN 50075000 RIO ICACOS NEAR NAGUABO, PR LOCATION.--Lat 18°16'38", long 65°47'09', Hydrologic Unit 21010001, in Caribbean National Forest, off Highway 191, at El Yunque, 1.6 mi (2.6 km) upstream fro 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.--17 years (1946-52, 1980-89), 15.0 ft'is (0.425 m'/s), 161.68 in/yr (4,107 mm/yr), 10,870 acre-ft/yr (13.4 he/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'is (81.0 m'/s), Apr. 21, 1983, gage height, 8.96 ft (2.731 m), from rating curve extended above 30 ft'is (0.850 m'/s) on basis of step-backwater analysis; minimum daily discharge, 1.5 ft'/s (0.042 m'/s), Mar. 22, Apr. 10, 1946. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 650 ft'/s (18.4 m 3/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (40/s) (ft) (m) Date Time (ft'/s) (m7s) (ft) (a) Nov. 13 1615 1,380 39.1 6.92 2.109 Sept. 18 0945 *2,480 70.2 *8.52 2.597 Apr. 1 1115 775 21.9 5.65 1.722 Sept. 28 1730 779 22.1 5.66 1.725 July 7 1415 901 25.5 5.96 1.817 Minimum discharge, 4.5 ft'is (0.127 '/s), June 30. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 7.9 7.9 9.1 9.4 14 8.1 115 12 17 5.4 10 10 2 9.5 12 9.4 8.0 16 7.6 17 7.7 54 27 7.4 14 3 32 7.6 10 7.5 21 7.7 26 8.1 69 7.7 6.6 12 4 64 8.3 8.8 7.0 14 7.3 13 11 13 22 45 8.4 5 10 7.4 18 6.9 12 7.3 15 10 11 46 8.9 7.9 6 11 8.1 9.1 6.9 13 18 9.9 12 9.6 14 6.8 7.5 7 14 7.6 15 7.2 11 11 9.0 12 9.2 104 8.8 7.3 8 20 32 9.4 9.2 24 8.2 25 15 8.6 11 6.8 7.1 9 29 10 12 8.4 12 15 13 7.0 8.0 7.9 9.8 11 10 18 12 9.7 24 14 9.2 40 7.1 7.9 7.2 24 36 11 9.6 15 8.3 29 11 6.9 13 6.3 8.7 6.9 36 20 12 25 8.0 9.1 47 11 9.1 21 6.0 7.5 6.5 15 19 13 16 147 9.2 16 15 11 18 6.5 7.4 6.3 8.5 8.7 14 11 9.7 7.7 13 13 12 11 19 7.0 6.0 7.1 22 15 10 9.8 9.0 14 25 11 9.6 6.1 6.5 6.2 10 33 16 11 11 12 17 28 13 9.9 5.6 20 5.5 7.2 20 17 12 33 26 17 59 12 10 5.3 21 8.2 33 18 18 8.9 11 7.7 13 25 14 8.8 5.2 11 9.3 16 470 19 8.8 10 6.8 14 31 9.2 8.4 5.5 8.1 6.5 20 16 20 9.9 17 6.3 17 14 7.4 8.0 5.5 7.1 5.8 11 95 21 35 31 6.3 13 19 8.1 8.0 5.2 7.7 5.4 17 18 22 10 15 27 12 14 16 8.1 5.2 6.0 20 11 16 23 9.6 10 16 11 18 8.0 11 5.1 7.4 19 38 18 24 29 9.5 17 11 17 8.1 7.4 5.0 5.7 14 25 19 25 14 26 10 10 13 8.7 6.7 4.9 5.6 9.7 12 46 26 11 13 11 19 34 8.3 6.5 21 5.3 6.9 8.8 16 27 9.7 23 9.1 12 11 7.0 6.4 32 5.2 9.4 14 13 28 13 10 11 11 9.6 6.9 6.2 26 5.0 10 8.9 93 29 37 9.5 18 16 --- 21 6.4 7.7 4.9 5.9 40 32 30 15 9.1 30 14 49 8.8 51 4.8 5.7 12 14 31 8.9 --- 10 15 14 --- 24 --- 20 20 --- TOTAL 529.8 540.5 378.0 435.5 518.6 360.1 476.1 360.0 369.2 445.4 504.6 1127.9 MEAN 17.1 18.0 12.2 14.0 18.5 11.6 15.9 11.6 12.3 14.4 16.3 37.6 MAX 64 147 30 47 59 49 115 51 69 104 45 470 MIN 7.9 7.4 6.3 6.9 9.6 6.9 6.2 4.9 4.8 5.4 6.6 7.1 AC-FT 1050 1070 750 864 1030 714 944 714 732 883 1000 2240 CFSM 13.6 14.3 9.68 11.1 14.7 9.22 12.6 9.22 9.77 11.4 12.9 29.8 IN. 15.64 15.96 11.16 12.86 15.31 10.63 14.06 10.63 10.90 13.15 14.90 33.30 CAL YR 1988 TOTAL 5165.6 MEAN 14.1 MAX 147 MIN 4.0 AC-FT 10250 CFSM 11.2 IN. 152.51 WTR YR 1989 TOTAL 6045.7 MEAN 16.6 MAX 470 MIN 4.8 AC-FT 11990 CFSM 13.1 IN. 178.49 RIO BLANCO BASIN 229 50075000 RIO ICACOS NEAR NAGUABO. PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS AUGUST 1981 TO CURRENT YEAR DATE TIME STREAMFLOW, INSTANTANEOUS (CFS) SPECIFIC CON- DUCTANCE (UMHOS) TEMPERA- TURE (DEG C) DATE TIME STREAMFLOW, INSTANTANEOUS (CFS) SPECIFIC CON- DUCTANCE (UMHOS) TEMPERA- TURE (DEG C) OCT, 07 1057 NOV, 04 1206 DEC. 07 1148 JAN, 12 1140 FEB, 03 1111 MAR. 09 1217 12 9.5 13 45 24.3 7.4 51 61 108 42 52 58 21.0 21.0 20.0 19.0 19.0 19.0 APR, 06 1053 MAY, 12 1038 JUN, 08 1021 JUL, 11 1241 AUG, 11 0936 SEP, 13 1015 9.8 6.3 8.3 7.4 7.6 8.6 57 62 60 55 53 54 20.0 20.0 20.5 21.5 21.5 21.5 230 THIS PAGE WAS LEFT BLANK INTENTIONALLY Rib Anton Rut* basin Drainage boundary HUMACAO • Rio Grande de Loizo basin Map area Rio de la Plato basin rcit Drainage boundary Rio Salinas Ni un) basin 'a 00 EXPLANATION ARROYO 0920 SURFACE—WATER STATION AND NUMBER -0835 QUALITY—OF—WATER STATION AND NUMBER CARIBBEAN SEA • 31 WELL AND WELL NUMBER 4I 5 KILOMETERS 2 4 5 MILES Figure 21.--Southeastern river basins--Rio Humacao to Rio Seco basins. 232 RIO HUMACAO BASIN 50081000 RIO HUMACAO AT LAS PIEDRAS, 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 mil (17.22 km 2 ). 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 ft 3 /s (28.3 m'/s), and estimated daily discharges, which are poor. Gage-height and precipitation satellite telemetry at station. AVERAGE DISCHARGE.--5 years (1975-77, 1988-89), 26.2 ft 3 /s (0.742 m'is), 53.50 in/yr (1,359 mm/yr), 18,980 acre-ft/yr (23.4 hm 3 /yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 20,800 ft'/s (589 40/s) Sept. 6, 1960, gage height, 34.4 ft (10.485 m). datum then in use, from floodmarks, and rating curve extended above 5.300 ft'/s (150 m'/s) on basis of slope-area measurement of peak flow; minimum daily discharge. 2.2 ft'/s (0.062 m 3/s) July 16, 1974. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,000 ft'is (28.3 m 3/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft3/s) (m 3/s) (ft) (m) Date Time (ft3/s) (m'/s) (ft) (m) July 5 unknown 1,300 36.8 unknown Sept. 18 0815 *1,640 46.4 *5.70 1.737 Minimum discharge, 7.1 ft'is (0.201 40/s), Apr. 20-23. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 18 20 20 25 18 14 17 8.1 28 10 16 18 2 24 24 19 23 15 14 12 12 24 100 16 17 3 26 20 19 23 16 13 12 11 50 17 15 18 4 107 19 18 22 15 13 14 19 22 12 16 16 5 30 21 22 22 14 17 15 12 16 e331 17 15 6 23 22 18 22 16 20 15 34 15 e51 16 14 7 26 38 17 22 13 15 28 41 14 40 15 13 8 25 54 15 23 15 13 23 18 13 25 18 14 9 42 59 17 21 14 47 11 15 13 18 17 13 10 27 28 17 27 13 17 22 13 13 15 17 14 11 24 38 17 40 12 16 12 19 12 15 18 16 12 22 25 17 29 12 14 13 13 12 70 20 16 13 28 52 17 27 11 24 11 13 12 19 20 20 14 21 34 17 24 12 20 10 12 11 17 21 23 15 28 33 16 23 13 16 9.7 12 11 18 17 16 16 22 70 16 23 23 16 9.0 12 12 15 21 13 17 31 300 26 35 67 14 8.6 12 16 16 30 14 18 21 63 18 27 52 15 8.3 12 13 19 31 450 19 21 37 16 25 19 17 7.7 11 14 17 38 44 20 110 31 16 39 16 13 7.7 11 12 15 30 27 21 82 28 15 26 21 13 7.4 11 12 15 18 33 22 47 27 15 23 16 13 7.6 10 11 14 44 48 23 45 24 16 20 15 13 7.7 12 11 26 24 42 24 28 23 18 19 15 17 8.2 13 10 16 52 102 25 25 22 62 20 14 17 8.6 12 11 22 23 111 26 23 22 22 20 31 17 8.5 15 10 17 20 40 27 21 21 19 18 17 15 9.4 44 9.4 16 95 57 28 25 21 17 17 14 12 8.7 19 9.1 16 39 60 29 22 20 40 23 --- 13 9.4 13 11 15 32 101 30 22 20 56 21 15 11 16 9.2 15 24 39 31 21 --- 27 21 15 --- 59 --- 16 20 --- TOTAL 1037 1216 665 750 529 508 352.5 534.1 436.7 1028 800 1424 MEAN 33.5 40.5 21.5 24.2 18.9 16.4 11.7 17.2 14.6 33.2 25.8 47.5 MAX 110 300 62 40 67 47 28 59 50 331 95 450 MIN 18 19 15 17 11 12 7.4 8.1 9.1 10 15 13 AC-FT 2060 2410 1320 1490 1050 1010 699 1060 866 2040 1590 2820 CFSM 5.03 6.10 3.23 3.64 2.84 2.46 1.77 2.59 2.19 4.99 3.88 7.14 IN. 5.80 6.80 3.72 4.20 2.96 2.84 1.97 2.99 2.44 5.75 4.48 7.97 CAL YR 1988 TOTAL 8433.0 MEAN 23.0 MAX 300 MIN 5.7 AC-FT 16730 CFSM 3.46 IN. 47.17 WTR YR 1989 TOTAL 9280.3 MEAN 25.4 MAX 450 MIN 7.4 AC-FT 18410 CFSM 3.82 IN. 51.91 e Estimated I 233 RIO HUMACAO BASIN 50082000 RIO HUMACAO AT HIGHWAY 3 AT HUMACAO, PR WATER-QUALITY RECORDS LOCATION.--Lat 18 08'49", long 65 49'37", at bridge on Highway 3, 300 ft (91 m) downstream fro Quebrada Mariana, and 0.4 mi (0.6 km) south of Humacao. DRAINAGE AREA.--17.3 mil (44.8 km2 ). PERIOD OF RECORD.--Water years 1958-66, 1969 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1988 25... 1305 61 245 7.50 31.5 64 6.5 88 10 K9100 3600 DEC 08... 0820 32 242 6.70 22.0 10 8.3 94 13 3200 480 FEB 1989 23... 1100 13 267 6.60 25.5 16 6.8 82 15 K77000 K14000 APR 21... 1025 15 316 6.80 28.5 25 6.7 86 20 60000 57000 JUN 13... 0905 26 306 7.60 26.5 120 5.7 70 53 290000 97000 AUG 11... 1115 18 352 7.30 30.5 32 4.4 58 48 K920000 K170000 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SIUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1988 25... 73 0 19 6.3 22 1 2.3 88 <0.5 12 19 DEC 08... 94 FEB 1989 23... 82 APR 21... 88 4 24 6.9 26 1 2.5 86 <0.5 14 27 JUN 13... 70 AUG 11... 86 0 24 6.4 27 1 2.5 58 12 31 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2.0403 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) S102) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 25... 0.1 35 162 27 188 0.77 0.03 0.80 0.13 0.17 DEC 08... 23 0.79 0.01 0.80 0.04 0.36 FEB 1989 23... 30 1.03 0.07 1.10 0.19 0.41 APR 21... 0.2 38 189 7.8 28 0.64 0.06 0.70 1.20 0.70 JUN 13... 300 0.65 0.05 0.70 1.10 0.60 AUG 11... 0.1 39 201 10 54 0.65 0.05 0.70 1.30 1.5 K non-ideal count 234 RIO HUMACAO BASIN 50082000 RIO HUMACAO AT HIGHWAY 3 AT HUMACAO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (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 NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1988 25... 0.3 1.1 4.9 0.12 <1 400 60 <1 57 830 DEC 08... 0.4 1.2 5.3 0.12 FEB 1989 23... 0.6 1.7 7.5 0.26 APR 21... 1.9 2.6 12 0.47 <1 200 50 <1 <1 20 JUN 13... 1.7 2.4 11 0.48 AUG 11... 2.8 3.5 15 0.64 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- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1988 25... 24000 11 430 0.1 <1 <1 70 <0.01 1 <0.01 DEC 08... FEB 1989 23... APR 21... 2500 5 200 <0.1 <1 16 30 <0.01 3 0.36 JUN 13... AUG 235 RIO GUAYANES BASIN 50083500 RIO GUAYANES 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 2 (44.6 km2 ). PERIOD OF RECORD.--Water years 1958-62, 1968-70, 1980 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1988 25... 0850 70 153 6.90 24.0 7.6 7.7 91 <10 K1400 2700 DEC 23... 0830 44 159 6.40 22.2 11 8.0 91 20 K1300 690 FEB 1989 14... 0900 30 166 6.20 21.5 5.6 7.5 83 <10 340 2100 APR 19... 1145 32 160 6.60 25.5 41 6.9 84 15 K1400 3600 JUN 19... 1130 30 167 7.40 26.0 2.0 6.4 77 57 K1200 290 AUG 11... 0920 18 120 7.20 25.0 8.4 7.1 85 17 2200 3600 HARD- ALKA- KAU- NESS MAGNE- SODIUM ROTAS- LINITY CHLO- NESS NONCARB CALCIUM SIUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1988 25... 45 0 11 4.2 15 1 1.6 52 1.6 6.0 12 DEC 23... 53 FEB 1989 14... 54 APR 19... 49 0 12 4.7 15 1 1.4 56 <0.5 4.0 11 JUN 19... -- 57 AUG 11... 52 0 13 4.8 15 0.9 1.4 60 4.0 11 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 25... 0.1 35 117 22 11 <0.01 0.40 0.04 DEC 23... 9 <0.01 0.40 0.04 0.46 FEB 1989 14... 14 <0.01 0.40 0.05 0.15 APR 19... 0.1 36 120 10 92 0.18 0.02 0.20 0.05 JUN 19... 13 <0.01 0.20 0.03 0.47 AUG 11... 0.1 37 123 6.1 25 <0.01 0.20 0.04 0.86 K = non-ideal count 236 RIO GUAYANES BASIN 50083500 RIO GUAYANES AT YABUCOA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (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 NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1988 25... <0.2 0.05 <1 100 30 1 1 <10 DEC 23... 0.5 0.9 4.0 0.08 FEB 1989 14... 0.2 0.6 2.7 0.05 APR 19... <0.2 0.16 <1 100 30 <1 <1 20 JUN 19... 0.5 0.7 3.1 0.03 AUG 11... 0.9 1.1 4.9 0.06 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- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1988 25... 1600 <5 70 <0.1 <1 <1 10 <0.01 1 0.02 DEC 23... FEB 1989 14... APR 19... 4700 <5 160 <0.1 <1 <1 <10 <0.01 9 0.09 JUN 19... AUG 11... PESTICIDE ANALYSES CHLOR- DI- DI- ENDO- PCB, ALDRIN, DANE, DOD, DDE, DDT, AZINON, ELDRIN SULFAN, DATE 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) JUN 19... 1130 <0.1 <0.01 <0.1 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 HEPTA- METH- METHYL METHYL HEPTA- CHLOR MALA- OXY- PARA- TRI- ENDRIN, ETHION, CHLOR, EPDXIDE LINDANE THION, CHLOR, THION, THION, MIREX, DATE 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) JUN 19... <0.01 <0.01 <0.01 <0.01 <0.01 <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, 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) JUN 19... <0.01 <0.1 <0.1 <1 <0.01 0.01 <0.01 <0.01 <0.01 RIO GUAYANES BASIN 237 50086500 RIO GUAYANES ABOVE MOUTH AT PLAYA DE GUAYANES, 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 mil (88.1 km2 ). PERIOD OF RECORD.--Water years 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1988 25... 1100 126 204 7.00 27.0 22 6.3 78 32 2100 2700 DEC 23... 1015 74 182 6.60 24.0 17 6.4 73 24 2500 410 FEB 1989 23... 0910 59 166 6.20 23.0 19 7.9 91 <10 K1100 710 APR 21... 0855 43 188 6.60 24.0 6.0 7.4 87 17 K820 2100 JUN 20... 0900 48 198 7.60 25.5 14 7.3 87 15 K1100 580 AUG 14... 1125 67 141 7.30 29.5 32 6.5 85 20 3300 K1200 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SLUM, SODIUM, AD- SIUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLO SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1988 25... 58 0 14 5.5 19 1 2.3 53 14 9.9 15 DEC 23... 49 FEB 1989 23... 47 APR 21... 57 0 14 5.3 19 1 1.8 57 <0.5 3.0 15 JUN 20... 62 AUG 14... 39 0 9.8 3.6 13 0.9 1.9 46 5.0 11 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIOE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 25... 0.1 33 140 48 24 0.39 0.01 0.40 0.07 0.23 DEC 23... 37 0.39 0.01 0.40 0.03 0.37 FEB 1989 23... 22 0.49 0.01 0.50 0.03 0.67 APR 21... 0.1 38 139 16 17 0.19 0.01 0.20 0.03 0.27 JUN 20... 14 0.19 0.01 0.20 0.02 0.28 AUG 14... 0.1 31 103 19 57 0.49 0.01 0.50 0.04 0.56 K non-ideal count 238 RIO GUAYANES BASIN 50086500 RIO GUAYANES ABOVE MOUTH AT PLAYA DE GUAYANES, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM. COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- NITRO- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/I. (UG/L (UG/L (UG/L AS N) AS N) AS $03) AS P) AS AS) AS BA) AS 8) AS CO) AS CR) AS CU) OCT 1988 <1 1 <10 25... 0.3 0.7 3.1 0.09 <1 100 40 DEC 23... 0.4 0.8 3.5 0.06 FEB 1989 23... 0.7 1.2 5.3 0.10 APR <1 <1 10 21... 0.3 0.5 2.2 0.08 <1 100 30 JUN 20... 0.3 0.5 2.2 0.07 AUG 14... 0.6 1.1 4.9 0.10 METHY- LENE MANGA- IRON, LEAD, NESE, MERCURY SILVER. ZINC. 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- (MG/L TOTAL STANCE DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1988 <1 <1 20 <0.01 1 0.02 25... 2800 5 210 <0.1 DEC 23... FEB 1989 23... APR 21... 1900 <5 90 <0.1 <1 <1 10 <0.01 <1 0.03 JUN 20... AUG 14... RIO MAUNABO BASIN 239 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 mil (32.1 km'). PERIOD OF RECORD.--Water years 1958-66, 1975 to current year. WATER-QUALITY DATA. WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 018- OXYGEN, OXYGEN COLT- STREP- CHARGE, SPE- DIS- DEMAND, FORM. TOCOCCI INST. CIFIC SOLVED CHEM- FECAL. FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1988 24... 0950 45 223 7.10 26.0 6.1 5.6 68 '10 K890 K1500 DEC 21... 1115 23 281 6.80 25.0 7.6 7.6 90 90 K19000 460 FEB 1989 21... 1200 27 205 6.40 25.0 860 7.5 89 18 K97000 230000 APR 19... 0935 14 237 6.80 24.5 29 7.0 82 17 K630 490 JUN 19... 0935 12 202 7.60 27.0 28 6.6 81 17 470 2000 AUG 14... 0905 22 216 7.30 26.0 24 6.6 80 25 29000 46000 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SIUM, SODIUM, AD- SIUM, KAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE 01S- DIS- (MG/L TOT FLO SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS 5) AS SO4) AS CL) OCT 1988 24... 68 0 16 6.9 19 1 1.3 69 <0.5 12 16 DEC 21... 77 FEB 1989 21... 66 APR 19... 75 0 18 7.3 20 1 1.1 78 <0.5 9.0 17 JUN 19... 84 AUG 14... 65 0 16 6.1 18 1 1.8 70 8.0 14 SOLIDS. RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN. GEN, GEN, GEM, DIS- SOLVED TUENTS. SOLVED DEG. C. NITRATE NITRITE NO2*NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 24... 0.1 38 152 18.6 11 0.59 0.01 0.60 0.03 0.37 DEC 21... 37 0.49 0.01 0.50 0.02 0.28 FEB 1989 21... 1460 0.36 0.04 0.40 0.10 1.60 APR 19... 0.1 38 160 6.2 134 0.18 0.02 0.20 0.06 0.44 JUN 19... 112 '0.01 '0.10 0.02 AUG 14... 0.1 35 142 8.5 35 0.29 0.01 0.30 0.03 0.47 K non-ideal count 240 RIO MAUNABO BASIN 50091000 RIO MAUNABO AT MAUNABO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA $ NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEM. GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/1 (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1988 24... 0.4 1.0 4.4 0.03 1 <100 20 <1 1 <10 DEC 21... 0.3 0.8 3.5 0.07 FEB 1989 21... 1.7 2.1 9.3 0.54 APR 19... 0.5 0.7 3.1 0.08 <1 100 30 <1 <1 20 JUN 19... <0.2 0.04 AUG 14... 0.5 0.8 3.5 0.09 METHY- IRON. LEAD. NESE. MERCURY SILVER. ZINC. MANGA- LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM. RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL BASLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1988 24... 910 40 <0.1 <1 <5 1 10 <0.01 <1 0.02 DEC 21... FEB 1989 21... APR 19... 8500 <5 270 <0.1 <1 <1 30 <0.01 4 0.02 JUN 19... AUG 14... RIO CHICO BASIN 241 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 •) south of Highway 3, 0.5 •i (0.8 km) above mouth, and 1.5 •i (2.4 km) southeast of Patillas plaza. DRAINAGE AREA.--4.9 •it (12.8 ke). PERIOD OF RECORD.--Water years 1979 to current year. WATER-QUALITY DATA. WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 DIS- OXYGEN, OXYGEN CDLI- STREP- CHARGE. SPE- D1S- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL. FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN. (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARO WATER 1TY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) AIION) (MG/L) 100 ML) 100 ML) OCT 1988 24... 0815 15 320 7.60 25.0 90 7.3 88 11 480000 K180000 DEC 21... 0920 3.4 472 7.00 22.5 3.6 5.8 66 33 250000 K18000 FEB 1989 21... 1020 12 324 1.00 23.5 27 7.9 91 17 270000 49000 APR 12... 1055 2.4 441 7.20 26.0 4.0 7.9 95 15 K100 K100 JUN 15... 0905 0.12 768 7.60 27.0 0.6 2.9 36 50 20 50 AUG 10... 0900 2.0 564 7.30 28.0 4.9 5.3 66 48 K1O 40 HARD- ALKA- HARD- NESS MAGNE- SODIUM ROTAS- LINITY CHLO- NESS NONCARB CALCIUM SIUM. SODIUM, AD- S1UM. WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS NG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1988 24... 95 0 20 11 35 2 3.1 110 <0.5 15 24 DEC 21... 160 FEB 1989 21... 110 APR 12... 110 0 26 12 42 2 3.1 140 <0.5 15 34 JUN 15... 130 AUG 10... 120 0 29 11 61 2 7.7 120 39 53 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS. TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEM, GEN. GEN, GEM. GEN, 01S- SOLVED TUENTS. SOLVED DEG. C, NITRATE NITRITE NO2tNO3 AMMONIA ORGANIC SOLVED (MG/L 01S- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) S102) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 24... 0.1 32 201 21 78 0.96 0.04 1.00 1.90 2.5 DEC 21... 7 0.36 0.04 0.40 5.10 1.7 FEB 1989 21... 18 0.63 0.07 0.70 0.68 0.82 APR 12... 0.2 31 250 1.6 4 0.87 0.13 1.00 2.00 1.0 JUN 15... 4 8.09 0.41 8.50 0.77 1.7 AUG 10... 0.1 32 340 7 4.94 0.36 5.30 0.57 1.9 K • non-ideal count 242 RIO CHICO BASIN 50091800 RIO CHICO AT PROVIDENCIA. PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUm, COPPER, MONIA , NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEM, GEM, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (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 NO3) AS P) AS AS) AS BA) AS 8) AS CO) AS CR) AS CU) NITRO- OCT 1988 24... 4.4 5.4 24 0.40 1 100 20 <1 3 20 DEC 21... 6.8 7.2 32 1.40 FEB 1989 21... 1.5 2.2 9.7 0.53 APR 12... 3.0 4.0 18 1.60 <1 100 90 <1 1 <10 JUN 15... 2.5 11 49 6.80 AUG 10... 2.5 7.8 23 6.10 METHY- IRON. LEAD. NESE, MERCURY SILVER, ZINC, MANGA- 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 (MG/L TOTAL STANCE DATE (UG/L (UG/L (UG/L (UG/L (UG/L AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1988 <1 <0.01 3 0.08 24... 7100 <5 150 <0.1 1 <10 DEC 21. FEB 1989 21... APR 20 <0.01 3 0.24 12... 280 <5 90 <0.1 <1 <1 JUN 15... AUG 10... 243 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 , (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.--23 years (1967-89), 61.2 ft'is (1.733 m'/s), 45.42 in/yr (1,154 mm/yr), 44,340 acre-ft/yr (54.7 he/yr); median of yearly mean discharges, 61 ft'is (1.73 m'/s), 44,200 acre-ft/yr (54 he/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 14,800 ft'is (419 m'/s), Sept. 16, 1975, gage height, 12.45 ft (3.795 m), from rating curve extended above 250 ft'is (7.08 m'/s) on basis of slope-area measurement of peak flow; minimum discharge, 4.6 ft'/s (0.130 m'/s), May 13-16, 1968. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 2,500 ft'/s (70.8 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (W/s) (m'/s) (ft) (m) Date Time (ft'/s) (m'/s) (ft) (m) Nov. 17 0415 2,520 71.4 8.50 2.591 Sept. 18 1000 *4,600 130 *10.37 3.161 Aug. 18 2400 3,800 108 9.77 2.978 Sept. 23 2200 4,470 126 10.28 3.133 Minimum daily discharge, 16 ft'/s (0.453 m'/s), Feb. 12-14. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 34 34 43 60 31 32 54 24 57 31 22 41 2 39 257 43 52 27 29 33 25 51 78 21 35 3 248 78 41 45 30 31 30 26 44 34 20 33 4 286 60 38 40 25 35 28 25 37 21 20 31 5 163 48 38 37 19 34 27 30 32 46 21 30 6 130 45 37 34 22 40 26 43 29 32 20 35 7 137 48 36 41 18 46 26 56 26 47 19 34 8 112 52 36 37 27 69 30 30 25 39 19 37 9 99 60 34 34 22 79 28 24 24 38 20 38 10 90 45 35 32 18 125 63 23 23 25 20 89 11 61 74 33 51 17 54 44 22 25 24 23 89 12 85 57 31 61 16 52 54 21 24 28 22 161 13 80 46 36 80 16 72 47 21 24 22 29 61 14 51 63 32 40 16 51 33 20 23 20 26 65 15 63 62 31 31 24 41 29 20 22 19 26 95 16 91 140 32 28 55 38 31 20 22 18 25 60 17 97 748 57 40 479 36 33 20 25 19 24 72 18 64 258 40 42 173 34 28 20 23 20 67 1040 19 51 163 30 59 34 30 27 19 21 19 204 305 20 239 116 27 34 42 30 27 19 20 18 41 156 21 258 95 25 62 38 31 26 19 20 18 33 287 22 134 91 25 34 33 32 26 19 22 22 23 382 23 100 74 30 26 34 41 24 19 21 49 41 904 24 77 65 71 23 30 40 22 18 20 28 66 509 25 62 68 90 20 50 37 21 17 19 25 33 226 82 20 33 21 68 145 27 44 67 38 20 41 33 21 44 19 30 77 113 28 42 52 32 18 35 30 21 80 20 30 36 94 29 78 48 159 25 --- 28 26 33 26 25 106 86 30 49 45 179 28 34 32 60 31 22 107 73 31 38 --- 81 28 32 --- 94 --- 22 26 52 52 48 21 19 25 52 --- 937 MEAN 102 105 48.8 37.3 51.6 42.9 31.3 30.1 26.5 30.2 41.5 178 MAX 286 748 179 80 479 125 63 57 78 204 TOTAL 3154 3141 1512 1157 1445 1329 938 932 794 1288 5326 94 1040 MIN 34 34 25 18 16 28 21 17 19 18 19 30 AC-FT 6260 6230 3000 2290 2870 2640 1860 1850 1570 1860 2550 10560 CFSM 5.56 5.72 2.67 2.04 2.82 2.34 1.71 1.64 1.45 1.65 2.27 9.70 IN. 6.41 6.38 3.07 2.35 2.94 2.70 1.91 1.89 1.61 1.90 2.62 10.83 CAL YR 1988 TOTAL 26827 MEAN 73.3 MAX 1320 MIN 11 AC-FT 53210 CFSM 4.01 IN. 54.53 WTR YR 1989 TOTAL 21953 MEAN 60.1 MAX 1040 MIN 16 AC-FT 43540 CFSM 3.29 IN. 44.63 244 RIO GRANDE DE PATILLAS BASIN 50092000 RIO GRANDE DE PATILLAS NEAR PATILLAS, PR--Continued (National stream-quality accounting network station) WATER-QUALITY RECORDS PERIOD OF RECORD.--Water years 1960 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 DIS- OXYGEN, COLA- STREP- CHARGE, SPE- DIS- FORM, TOCOCCI HARD- INST. CIFIC SOLVED FECAL, FECAL, NESS CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- 0.7 KF AGAR TOTAL FEET DUCT- (STAND- ATURE BID- DIS- CENT UM-MF (COLS. (MG/L DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- (COLS./ PER AS SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) 100 ML) 100 ML) CAC03) OCT 1988 14... 1040 55 145 7.80 25.0 2.8 8.8 106 K12000 K900 45 JAN 1989 10... 0950 30 160 6.90 21.5 2.9 8.7 98 6400 9700 52 APR 13... 0955 46 117 6.60 22.0 5.1 10.5 119 4300 2800 35 JUL 21... 1015 22 250 7.80 26.0 1.0 7.0 86 4300 2700 49 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- FLUO- SILICA, NONCARB CALCIUM SIUM, SODIUM, AD- SIUM, WAT WH SULFATE RIDE, RIDE, DIS- WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET DIS- DIS- DIS- SOLVED TOT FLO SOLVED SOLVED SOLVED TION SOLVED FIELD SOLVED SOLVED SOLVED (MG/L DATE MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L AS CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS SO4) AS CL) AS F) SI02) OCT 1988 14... 0 10 4.9 13 0.9 1.0 47 9.7 11 0.1 26 JAN 1989 10... 0 12 5.4 14 0.9 0.6 51 12 11 0.1 28 APR 13... 0 7.9 3.7 11 0.8 0.6 47 7.0 11 0.1 17 JUL 21... 0 11 5.1 13 0.8 0.4 50 11 12 0.1 23 SOLIDS. SOLIDS, NITRO- NITRO- NITRO- NITRO- PHOS- PHOS- RESIDUE SUM OF SOLIDS, GEN, GEN, GEN, GEN,AM- PHOS- PHOROUS PRATE, AT 180 CONSTI- DIS- NO2+NO3 AMMONIA AMMONIA MONIA + PHOS- PHOROUS ORTHO, ORTHO, DEG. C TUENTS, SOLVED DIS- DIS- DIS- ORGANIC PHOROUS DIS- DIS- 01S- DIS- DIS- (TONS SOLVED SOLVED SOLVED TOTAL TOTAL SOLVED SOLVED SOLVED DATE SOLVED SOLVED PER (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L) (MG/L) DAY) AS N) AS N) AS NH4) AS N) AS P) AS P) AS P) AS PO4) OCT 1988 14... 109 106 16 0.24 0.02 0.03 0.4 0.02 0.02 0.02 0.06 JAN 1989 10... 110 117 9.4 0.28 0.09 0.12 0.2 0.02 0.02 0.02 0.06 APR 13... 79 80 10 0.11 0.05 0.06 0.8 0.02 0.02 0.01 0.03 JUL 21... 103 120 7.0 0.10 0.03 0.04 0.8 0.02 0.04 0.02 0.06 ALUM- BERYL- CHRO- INUM, ARSENIC BARIUM, LIUM. CADMIUM M1UM, COBALT, COPPER, IRON, LEAD, DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS AL) AS AS) AS BA) AS BE) AS CD) AS CR) AS CO) AS CU) AS FE) AS PB) OCT 1988 14... 30 <1 13 <0.5 <1 <1 <3 1 79 <5 JAN 1989 10... 100 <1 14 <0.5 1 <1 <3 2 62 6 APR 13... 40 <1 9 <0.5 ,1 <1 <3 3 120 <5 JUL 21... 10 <1 16 <0.5 1 <1 <3 1 18 <1 K.non-ideal count RIO GRANDE DE PATILLAS BASIN 245 50092000 RIO GRANDE DE PATILLAS NEAR PATILLAS, PR--Continued (National stream-quality accounting network station) WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 DATE MANGA- MOLYB- SELE- STRON- VANA- LITHIUM NESE, MERCURY DENUM, NICKEL, NIUM, SILVER, TIUM, DIUM, ZINC, DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS LI) AS MN) AS HG) AS MO) AS NI) AS SE) AS AG) AS SR) AS V) AS ZN) OCT 1988 14... JAN 1989 10... APR 13... JUL 21... <4 <4 <4 <4 13 22 6 7 <0.1 <0.1 <0.1 <0.1 <10 <10 <10 <10 1 2 <1 <1 <1 <1 <1 <1 <1.0 <1.0 1.0 <1.0 37 42 28 39 <6 <6 <6 <6 9 13 11 4 PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT SED. SEDI- SUSP. MENT, SIEVE STREAM- SEDI- DIS- DIAM. FLOW, MENT, CHARGE, PERCENT INSTAN- SUS- SUS- FINER DATE TIME TANEOUS PENDED PENDED THAN (CFS) (MG/L) (T/DAY) .062 MM OCT 1988 14... JAN 1989 10... APR 13... JUL 21... 1040 0950 0955 1015 55 30 46 22 4 6 15 22 0.60 0.49 1.8 1.3 56 79 100 98 246 THIS PAGE WAS LEFT BLANK INTENTIONALLY 18 Grande de Manor basin EXPLANATION A1080 SURFACE—WATER STATION Island, AND NUMBER divide j \ ) QUALITY—OF—WATER V1065 (' ) ., AIBOWTO STATION AND NUMBER N vac," • 87 WELL AND WELL NUMBER FCo de , o Pioto basin VILLALBA CREST—STAGE GAGE STATION A1006 CAYEY is ago Drainage boundary Guayobal RiTainobo'n basin L, ( Island divide Drainage boundary UANA 50 DIAZ N • 180157V JAC P'.°-‘"":. Rio Gutman,' basir JAC-3 Rio Sec o basin HW—TW— 14 JAC-4 Coamo HW—TW— 15 11‘ • 6 to • GUAYAMA Z•087 TW-1 --A —TW-08 • SANTA ISABEL(--, CENTRAL AGUIRRE Bahrp ,A,P6:51 CARIBBEAN SEA .....f:A8UADIL LA EC180 FAJARDO', AYAGUEZ CAOUAS. qW" M' , 4 5 KILOMETERS Map oreo 5 MILES Figure 22.--South coast river basins--Rio Salinas to Rio Jacaguas basins. I 248 AGUAS VERDES BASIN 50099000 QUEBRADA AGUAS VERDES NEAR SALINAS, P.R. LOCATION.--Lat 17°59'43", Long 66°13'02", Hydrologic Unit 21010004, on left bank, upstream of Guamani irrigation channel 85 ft (26 m), 1.7 mi (2.7 km) from Colegio Perpetuo Socorro, Coqui, 0.7 mi (1.1 km) from Salinas and Guayama boundary and 1.3 mi (2.1 km) south east from Poblado Sabater. DRAINAGE AREA.--0.39 mil (1.01 km 2 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--July 1988 to April 1989 (discontinued). GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 129.93 ft (39.60 m) above mean sea level. REMARKS.--Records poor. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 0.61 ft 3 /s (0.02 0 3 /s), Oct. 3, gage-height, 17.17 ft (5.233 m), from rating curve extended above 50 ft 3 /s (1.42 m'/s), on basis of step-backwater analysis; minimum discharge 0.01 ft 3 /s (0.0003 3 /s), Feb. 20-28, Mar. 1-8, 13. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 .13 .09 e.07 .05 .03 .01 .08 2 .15 .10 e.07 .05 .03 .01 .08 3 .16 .10 e.06 .05 .02 .01 .08 4 .12 .10 e.06 .05 .02 .01 .08 5 .10 .10 e.06 .06 .03 .01 .07 6 .11 .10 e.06 .05 .03 .02 .07 7 .11 .10 e.06 .05 .03 .01 .07 8 .12 .10 e.06 .05 .03 .02 .06 9 .12 .11 e.05 .05 .03 .02 .06 10 .11 .11 e.05 .05 .03 .02 .06 11 .11 .11 e.05 .06 .03 .03 12 .12 .11 e.05 .06 .02 .03 13 .13 .11 e.05 .07 .02 .02 14 .11 .10 .05 .07 .02 .04 15 .10 .10 .05 .07 .02 .05 16 .11 .09 .05 .07 .02 .06 17 .10 e.11 .05 .07 .02 .07 18 .10 e.09 .05 .07 .02 .07 19 .10 e.09 .05 .06 .02 .06 20 e.11 e.09 .05 .06 .02 .07 21 e.14 e.09 .05 .06 .02 .06 22 e.09 e.08 .05 .06 .01 .07 23 e.14 e.08 .05 .06 .01 .07 24 .11 e.08 .05 .05 .01 .07 25 .09 e.08 .05 .05 .01 .08 26 .09 e.07 .05 .04 .01 .08 27 .09 e.07 .05 .04 .01 .08 28 .09 e.07 .05 .03 .01 .08 29 .09 e.07 .06 .03 .08 30 .10 e.07 .06 .03 .07 31 .10 --- .05 .03 .07 TOTAL 3.45 2.77 1.67 1.65 0.58 1.45 MEAN .11 .092 .054 .053 .021 .047 MAX .16 .11 .07 .07 .03 .08 MIN .09 .07 .05 .03 .01 .01 AC-FT 6.8 5.5 3.3 3.3 1.2 2.9 CFSM .29 .24 .14 .14 .05 .12 IN. .33 .26 .16 .16 .06 .14 e Estimated 249 RIO SALINAS BASIN 50100200 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 km 2 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--1953-63 (annual low-flow measurements only), September 1988 to September 1989. 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. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 1,540 ft'is (43.6 m'/s), Sept. 10, 1989, gage height, 9.94 ft (3.030 m) from rating curve extended above 100 ft'is (2.832 m'/s) on basis of step-backwater analysis; minimum daily discharge, 0.02 ft'/s (0.0006 mi/s), Aug. 29, 1989. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 200 ft'is (5.664 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ftqs) (m'is) (ft) (m) Date Time (ft'/s) (a0/s) (ft) (m) Sept. 10 1600 *1,540 43.6 *9.94 3.030 Sept. 23 1215 529 15.0 8.12 2.475 Sept. 18 0915 444 12.6 7.90 2.408 Minimum daily discharge 0.02 ft'is (0.0006 m'/s), Aug. 29. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 5.0 1.7 1.7 2.0 .78 .92 .44 .32 3.3 e.07 e.08 .09 2 3.1 2.3 1.6 1.8 .77 .92 .44 .24 2.7 e.07 e.05 .09 3 5.0 1.6 1.8 1.7 .79 .80 .48 .25 1.2 e.10 e.04 .12 4 4.2 1.5 1.7 1.5 .90 .76 .36 .23 .92 e.10 e.16 .10 5 3.9 1.7 1.5 1.5 .62 .77 .36 .22 .73 e.07 e.24 .07 6 3.2 1.5 1.5 1.2 .57 .77 .36 .27 .51 e.08 e.17 4.0 7 3.0 1.5 1.3 1.3 .62 .98 .33 .52 .32 e.14 e.08 8.8 8 2.7 1.5 1.5 1.3 .66 .84 .30 .56 .26 e.70 e.05 3.6 9 2.4 1.3 1.5 1.2 .67 .73 .30 .47 .26 e.20 e.12 1.9 10 2.4 .92 1.5 .92 .65 .77 .30 .38 .26 e.13 e.11 93 11 2.2 .92 1.5 1.0 .58 .74 .39 .30 .23 e.18 e.11 28 12 2.4 3.2 1.5 1.0 .44 .71 .37 .30 .23 e.27 e.07 8.5 13 2.4 2.0 1.3 1.1 .49 .95 .29 .30 .23 e.40 e.12 3.8 14 2.0 2.0 1.4 1.0 .63 .88 .24 .28 .20 e.20 e.12 2.0 15 1.8 1.2 1.5 .92 1.7 1.1 .22 .22 .23 e.13 e.06 .99 16 1.8 1.2 1.3 .92 3.4 .68 .22 .25 .20 e.10 e.11 .56 17 1.9 16 1.5 .92 8.9 .66 .27 .30 .18 e.09 .36 3.4 18 1.8 7.6 1.7 .92 6.4 .65 .29 .26 .16 e.09 .44 128 19 1.6 4.3 1.5 1.1 3.0 .65 .24 .23 .19 e.07 1.2 38 20 3.8 3.6 1.3 1.1 1.8 .65 .24 .19 .18 e.06 .62 9.5 21 4.1 3.0 1.3 1.1 1.8 .80 .24 .20 .13 e.05 .23 2.8 22 2.7 2.7 1.3 1.1 1.7 .71 .24 .18 .13 e.06 .18 29 23 2.0 2.6 1.3 1.1 1.5 .54 .29 .16 .18 e.08 .13 210 24 1.7 2.5 1.5 1.1 1.4 .54 .30 .14 .16 e.14 .10 135 25 1.5 2.0 2.3 .92 1.2 .52 .24 .13 .12 e.10 .09 55 26 1.6 2.1 2.0 .92 .97 .49 .20 .15 e.11 e.08 .05 34 27 1.8 2.0 1.7 1.0 .91 .44 .20 .18 e.12 e.12 .06 24 28 1.7 2.1 1.5 1.0 .92 .50 .22 .46 e.09 e.12 .04 18 29 2.6 2.0 1.9 .92 --- .81 .77 .52 e.08 e.13 .02 15 30 3.1 1.8 3.7 .92 .99 .53 .44 e.06 e.07 .12 15 31 2.2 --- 3.1 .92 .60 --- .51 --- e.06 .15 --- TOTAL 81.6 80.34 51.7 35.40 44.77 22.87 9.67 9.16 13.67 4.26 5.48 872.32 MEAN 2.63 2.68 1.67 1.14 1.60 .74 .32 .30 .46 .14 .18 29.1 MAX 5.0 16 3.7 2.0 8.9 1.1 .77 .56 3.3 .70 1.2 210 MIN 1.5 .92 1.3 .92 .44 .44 .20 .13 .06 .05 .02 .07 AC-FT 162 159 103 70 89 45 19 18 27 8.4 11 1730 CFSM .27 .27 .17 .12 .16 .07 .03 .03 .05 .01 .02 2.93 IN. .31 .30 .19 .13 .17 .09 .04 .03 .05 .02 .02 3.27 WTR YR 1989 TOTAL 1231.24 MEAN 3.37 MAX 210 MIN .02 AC-FT 2440 CFSM .34 IN. 4.62 e Estimated I I 250 RIO SALINAS BASIN 50100450 RIO MAJADA AT LA PLENA. PR 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 i (0.5 km) southwest of La Plena. DRAINAGE AREA.--16.7 mil (43.3 km 2). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--September 1988 to September 1989. GAGE.--Water-stage recorder. Elevation of gage is 410 ft (125 m), from topographic map. REMARKS.-Records fair. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 886 ft'is (25.1 3/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, 0.21 ft'is (0.006 m'/s), Sept. 5, 1989. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 50 ft'is (1.42 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (W/s) (10/s) (ft) (m) Date Time (ft'/s) (m'/s) (ft) (m) Oct. 3 0830 65.9 1.81 4.01 1.222 Sept. 10 1600 669 18.9 6.27 1.911 Oct. 20 1700 73.3 2.07 4.08 1.244 Sept. 18 1000 396 11.2 5.58 1.701 Nov. 2 0730 130 3.68 4.50 1.372 Sept. 23 2145 *886 25.1 *6.68 2.036 Nov. 17 0500 203 5.75 4.88 1.487 Minimum daily discharge 0.21 ft'/s (0.01 m'/s), Sept. 5. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 6.7 5.4 5.1 3.3 2.1 2.2 1.7 1.8 2.2 .32 .34 .69 2 5.8 25 5.0 3.1 2.1 2.1 1.6 1.5 3.0 .35 .27 .41 3 20 11 5.2 3.0 2.0 2.0 1.5 1.3 1.9 .58 .24 .30 4 15 7.2 4.8 3.1 2.1 2.2 1.5 1.2 1.5 .63 1.2 .27 5 12 5.9 4.7 3.0 2.0 2.2 1.4 1.1 1.2 .52 1.7 .21 6 9.9 5.1 4.7 3.0 1.9 2.6 1.1 1.2 .95 .60 1.2 7.7 7 7.9 5.0 4.4 3.1 2.0 3.2 1.1 1.6 .81 .99 .71 7.2 8 7.0 4.9 4.4 3.5 2.5 2.7 1.1 2.0 .71 1.7 .47 1.3 9 6.4 5.0 4.3 3.0 2.6 2.6 1.1 1.4 .62 .92 .36 .86 10 6.3 4.8 4.4 3.3 2.4 2.4 1.4 1.2 .63 .71 .28 44 11 6.0 4.8 4.3 4.2 2.4 2.5 2.3 1.2 .67 .91 .35 7.8 12 5.8 4.4 4.0 3.9 2.2 2.6 1.7 1.1 .71 .97 .33 6.5 13 7.2 7.5 3.7 4.9 2.1 5.3 1.5 1.0 .66 .92 .73 3.1 14 5.3 7.6 3.8 3.4 2.2 3.4 1.3 .90 .61 .71 .87 2.4 15 5.1 5.9 3.7 2.9 3.4 2.7 1.3 .92 .53 .56 .49 1.7 16 4.9 5.5 3.8 2.7 5.5 2.4 1.3 .85 .48 .37 .80 1.3 17 5.2 64 4.1 3.2 16 2.5 1.9 .80 .53 .33 .77 2.0 18 4.8 25 4.6 3.7 12 2.2 1.6 .77 .64 .33 .69 120 19 4.4 15 3.3 3.3 5.7 2.1 1.3 .68 .64 .33 .79 36 20 18 12 3.0 3.2 4.3 2.0 1.3 .66 .56 .34 .89 15 21 18 9.5 2.9 2.9 3.5 2.3 1.2 .66 .49 .39 .51 38 22 12 8.6 2.9 2.7 3.5 2.1 1.4 .60 .61 .47 .37 90 23 10 7.8 2.9 2.3 3.0 2.0 1.5 .60 .59 .57 .36 278 24 11 7.2 3.5 2.1 2.8 1.9 1.4 .51 .57 1.0 1.5 134 25 7.6 7.4 4.1 2.1 2.6 1.8 1.3 .51 .61 .73 1.5 31 26 6.2 7.8 3.2 2.1 2.5 1.6 1.0 .49 .65 .57 .71 18 27 5.7 6.8 2.7 2.1 2.3 1.5 1.0 1.0 .58 .71 .51 13 28 5.2 5.7 2.5 2.0 2.3 1.5 .97 1.4 .47 .60 .63 10 29 9.9 5.4 4.7 2.0 --- 1.7 1.9 1.3 .44 .45 .53 8.1 30 8.0 5.3 6.2 2.2 2.5 4.6 .97 .33 .33 1.3 6.2 31 6.6 --- 4.2 2.1 1.9 --- 1.2 --- .33 1.1 --- TOTAL 263.9 302.5 125.1 91.4 100.0 72.7 45.27 32.42 24.89 19.24 22.50 885.04 MEAN 8.51 10.1 4.04 2.95 3.57 2.35 1.51 1.05 .83 .62 .73 29.5 MAX 20 64 6.2 4.9 16 5.3 4.6 2.0 3.0 1.7 1.7 278 MIN 4.4 4.4 2.5 2.0 1.9 1.5 .97 .49 .33 .32 .24 .21 AC-FT 523 600 248 181 198 144 90 64 49 38 45 1760 CFSM .51 .60 .24 .18 .21 .14 .09 .06 .05 .04 .04 1.77 IN. .59 .67 .28 .20 .22 .16 .10 .07 .06 .04 .05 1.97 WTR YR 1989 TOTAL 1984.96 MEAN 5.44 MAX 278 MIN .21 AC-FT 3940 CFSM .33 IN. 4.42 I RIO COAMO BASIN 251 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 si (0.6 km) above Rio de la Mina, and 1.8 ii (2.9 ki) south of Coamo plaza. DRAINAGE AREA.--46.0 iZ (119.1 km'). PERIOD OF RECORD.--Water years 1978 to current year. WATER-QUALITY RECORDS, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 DIS- OXYGEN. OXYGEN COLT- STREP- CHARGE, SPE- DIS- DEMAND. FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN. (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1988 18... 1145 7.4 662 7.50 29.0 2.4 3.4 44 17 K77000 6200 DEC 19... 1030 5.9 676 7.10 23.0 4.4 3.0 35 22 250 290 FEB 1989 22... 1120 5.8 703 7.20 25.5 4.5 4.7 57 17 K1700 K2100 APR 18... 1125 3.3 570 7.10 27.5 2.0 3.4 43 <10 330 400 JUN 14... 1130 2.8 820 7.60 29.0 1.9 4.0 52 19 230 K110 AUG 22... 1135 22 656 7.60 27.5 16 5.7 72 45 K140000 K20000 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SLUM, SODIUM, AD- SIUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1988 18... 270 17 69 23 45 1 3.6 280 <0.5 26 40 DEC 19... 250 FEB 1989 22... 270 APR 18... 270 0 72 23 47 1 4.1 280 <0.5 33 51 JUN 14... 300 AUG 22... 240 0 64 19 34 1 4.7 230 38 35 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C. NITRATE NITRITE NO20103 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 18... 0.2 34 391 7.8 9 0.96 0.24 1.20 2.00 0.20 DEC 19. 5 1.62 0.28 1.90 0.94 0.66 FEB 1989 22... 8 1.34 0.26 1.60 2.40 0.20 APR 18... 0.3 33 428 3.8 8 1.22 0.18 1.40 2.30 0.40 JUN 14... 6 1.27 0.23 1.50 2.20 0.40 AUG 22... 0.2 29 358 21 46 0.99 0.11 1.10 0.96 1.1 K non-ideal count RIO COAMO BASIN 252 50106500 RIO COAMO NEAR COAMO, PR--Continued WATER-QUALITY RECORDS. WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA • NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEM. GEM, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE GATE (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 NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) NITRO- OCT 1988 18... 2.2 3.4 15 0.75 1 <100 90 <1 <1 <10 DEC 19... 1.6 3.5 15 0.76 FEB 1989 22... 2.6 4.2 19 0.97 APR 18... 2.7 4.1 18 1.20 2 100 100 <1 1 10 JUN 14... 2.6 4.1 18 1.40 AUG 22... 2.1 3.2 12 0.58 METHY- IRON, LEAD. NESE. MERCURY SILVER. ZINC, MANGA- 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- (MG/L TOTAL STANCE DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1988 18... 270 250 <0.1 <5 <1 <1 <10 <0.01 2 0.07 DEC 19... FEB 1989 22... APR <5 <1 1 <10 <0.01 6 0.16 18... 300 300 <0.1 JUN 14... AUG 22... 253 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 mil (33.4 km 2 ). 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 poor. AVERAGE DISCHARGE.--5 years (1985-1989), 9.85 ft'/s (0.279 m'/s), 10.37 in/yr (263 mm/yr), 8,797 acre-ft/yr (10.85 hm'/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 30,000 ft'is (850 m'/s), Oct. 7, 1985, gage height, 24.37 ft (7.43 m), from rating curve extended above 10,000 ft'/s (283 m'/s) on basis of step-backwater analysis; no flow many days. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,500 fti/s (42.5 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (W/s) (m'/s) (ft) (m) Date Time (W/s) (e/s) (ft) (m) Aug. 21 1615 *3,600 102 *10.67 3.252 Sept. 21 1700 1,700 48.1 8.05 2.454 Minimum discharge, 0.11 ft'is (0.003 m'/s), July 11. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 5.9 2.7 el.0 el.2 e.56 e.40 1.7 .45 .60 e.56 .31 e.74 2 3.2 2.4 el.0 1.1 .68 e.40 3.4 .45 40 e.70 .29 e.54 3 2.8 2.3 el.l. 1.1 .52 e.40 1.1 .47 8.3 e.60 .33 e.42 4 2.5 2.2 el.2 el.0 e.47 e.38 .98 .65 1.7 .52 .33 e.36 5 2.3 2.1 1.2 e.95 e.45 e.38 .87 .57 1.2 2.4 .31 e.36 6 2.2 2.2 1.4 e.90 e.59 e.38 .90 .52 1.0 1.2 .31 .41 7 2.0 1.8 el.2 el.0 e.52 .36 .81 .56 .91 .90 9.7 .40 8 1.9 1.4 e1.0 1.2 .51 .35 .80 .57 el.1 .72 1.0 .39 9 1.8 1.3 e.96 e.95 .50 .38 .80 .98 el.0 .52 .27 3.4 10 1.7 1.3 el.3 e.85 .52 .37 .96 e.82 .90 .35 1.2 11 11 2.1 1.4 1.6 e.78 .67 .36 1.0 e.68 e.88 .32 1.4 1.4 12 1.7 4.4 el.4 e.72 .67 .69 1.1 e.60 e.79 .70 .90 .63 13 1.7 1.3 el.3 1.1 .50 .58 e.90 e.55 e.63 e.50 .56 e.52 14 1.6 4.9 el.2 1.0 .51 .48 e.77 e.51 .56 e.41 .41 e.45 15 1.7 2.7 el.1 e.88 .63 .41 e.69 e.48 .58 e.35 .41 e.40 16 1.7 2.6 el.0 e.80 1.0 .38 e.64 e.45 .58 .30 .38 e.36 17 1.5 7.4 e.95 1.0 el.2 .38 e.84 e.42 .63 .43 .42 .55 18 1.3 3.5 1.5 e.90 e.80 .41 .97 e.41 1.0 .37 .44 34 19 1.2 2.7 1.4 1.0 e.60 5.1 1.1 e.40 e.90 .35 1.6 49 20 1.3 2.4 el.2 .95 e.50 22 1.1 e.39 e.77 .33 .64 18 21 1.6 2.2 el.1 e.84 e.40 1.7 .96 e.38 e.64 .34 171 121 22 1.4 2.5 el.0 e.78 e.40 1.6 1.1 e.38 e.56 .37 1.4 12 23 92 2.4 el.0 e.71 e.40 1.6 .75 e.37 e.50 .37 .45 85 24 23 2.2 1.4 e.67 e.40 1.5 .59 e.46 .65 .38 9.9 28 25 9.2 34 1.6 e.64 e.40 1.5 .59 .73 .63 .34 1.6 9.7 26 16 4.4 1.3 e.60 e.50 1.5 .56 e.50 .58 .32 .72 7.9 27 75 1.7 1.2 e.58 e.60 1.9 .57 e.41 .56 .32 e.54 6.1 28 52 el.1 1.1 e.56 e.50 1.5 .48 e.36 .52 .31 .87 5.3 29 8.5 el.0 1.2 .88 --- 2.3 .76 e.34 e.49 .29 19 5.6 30 2.7 e.98 1.2 e.78 1.6 .59 .49 e.46 .31 1.8 4.6 31 2.7 --- 1.1 e.65 2.3 --- .38 --- .44 el.]. --- TOTAL 326.2 105.48 37.21 27.07 16.00 53.59 28.38 15.73 69.62 16.32 229.59 408.53 MEAN 10.5 3.52 1.20 .87 .57 1.73 .95 .51 2.32 .53 7.41 13.6 MAX 92 34 1.6 1.2 1.2 22 3.4 .98 40 2.4 171 121 MIN 1.2 .98 .95 .56 .40 .35 .48 .34 .46 .29 .27 .36 AC-FT 647 209 74 54 32 106 56 31 138 32 455 810 CFSM .82 .27 .09 .07 .04 .13 .07 .04 .18 .04 .57 1.06 IN. .94 .30 .11 .08 .05 .15 .08 .05 .20 .05 .66 1.18 CAL YR 1988 TOTAL 1689.95 MEAN 4.62 MAX 185 MIN .41 AC-FT 3350 CFSM .36 IN. 4.87 WTR YR 1989 TOTAL 1333.72 MEAN 3.65 MAX 171 MIN .27 AC-FT 2650 CFSM .28 IN. 3.85 e Estimated 254 RIO DESCALABRADO BASIN 50108000 RIO DESCALABRADO NEAR LOS LLANOS, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS APRIL 1984 TO SEPTEMBER 1985, OCTOBER 1987 TO CURRENT YEAR STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) OCT, 03 1000 3.0 588 27.5 MAR, 06 1112 .39 718 25.0 OCT, 31 0857 479 25.0 ABR, 03 1124 1.0 624 28.5 NOV, 03 1354 -- 307 29.0 MAY, 01 1037 .43 706 28.0 DEC, 05 1410 1.4 588 27.5 JUN, 01 1113 .53 742 27.5 JAN, 03 0934 1.2 612 22.5 AUG, 11 1207 .35 620 31.5 FEB, 06 1104 .59 700 25.0 SEP, 05 1542 .38 612 28.5 I 255 RIO JACAGUAS BASIN 50110900 RIO TOA VACA ABOVE LAGO TOA VACA, P.R. 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) fro 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 mil (19.79 km2). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--April to September 1989. GAGE.--Water stage recorder. Elevation of gage is 525 ft (160 m ), from topographic map. REMARKS.--Records fair. Gage-height and precipitation satellite telemetry at station. EXTREMES FOR CURRENT PERIOD.--Peak discharges greater than base discharge of 1,000 ft'/s (28.3 03/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft,/s) (40/s) (ft) (m) Date Time (ftl/s) (10/s) (ft) (m) Aug. 24 1545 *3,740 106 *9.62 2.932 Sept. 19 2045 1,240 35.1 6.88 2.097 Sept. 18 1130 2,350 66.6 8.28 2.524 Minimum discharge, 0.78 ft3/s (0.02 m)/s), Aug. 3. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 1.3 5.1 1.2 .93 3.5 2 1.0 8.2 1.6 .87 2.7 3 .96 12 1.6 .96 2.3 4 .96 30 1.4 5.9 1.9 5 1.2 .96 13 1.4 6.6 1.9 6 1.2 .96 4.8 2.6 2.6 2.1 7 1.1 1.2 3.4 5.7 2.7 1.9 8 1.1 1.3 2.4 4.1 2.5 20 9 1.1 1.5 2.0 2.5 1.5 30 10 1.1 1.8 1.8 2.1 1.7 30 11 1.1 1.1 1.6 16 4.2 42 12 1.1 1.1 1.7 8.1 2.2 14 13 1.3 1.1 1.7 34 2.1 8.5 14 1.3 1.2 1.6 17 1.3 5.4 15 1.3 1.4 1.5 5.4 1.1 4.1 16 1.3 1.4 1.4 3.1 1.2 3.2 17 1.3 1.3 1.4 2.0 1.1 3.1 18 1.4 1.4 1.3 1.7 1.1 356 19 1.4 1.4 1.5 1.6 3.5 180 20 1.7 1.5 1.3 1.6 2.2 79 21 1.7 1.5 1.2 1.6 25 65 22 1,8 1.6 2.9 1.5 3.0 28 23 1.2 1.7 1.7 1.4 1.6 68 24 1.2 1.7 1.4 1.1 219 123 25 1.2 3.3 1.3 1.2 39 58 26 1.1 3.3 1.2 1.3 8.6 27 27 1.3 3.6 1.2 .99 5.3 16 28 1.1 2.7 1.2 1.1 4.1 53 29 1.1 21 1.1 1.1 6.0 83 30 1.4 6.5 1.1 1.1 7.6 72 31 --- 3.8 --- .95 4.1 --- TOTAL 75.54 112.0 128.04 369.56 1384.6 MEAN 2.44 3.73 4.13 11.9 46.2 MAX 21 30 34 219 356 MIN .96 1.1 .95 .87 1.9 AC-FT 150 222 254 733 2750 CFSM .32 .49 .54 1.56 6.04 IN. .37 .55 .62 1.80 6.74 RIO JACAGUAS BASIN ?56 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 mil (129.0 km 2 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--March 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. Flow regulation from Lago Guayabal. Gage-height and precipitation satellite telemetry at station. AVERAGE DISCHARGE.--5 years (1985-89), 53.1 ft'is (1.504 m'/s), 14.48 in/yr (368 mm/yr), 38,470 acre-ft/yr (47.4 hm3/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 40,000 ft'is (1,130 m 3/s), Oct. 7, 1985, gage height, 29.42 ft (8.967 m) from rating curve extended above 500 ft'is (14.2 m'/s) on basis of step-backwater analysis and logarithmic extension; minimum daily discharge, 1.2 fti/s (0.034 m'/s), May 18, 1984. EXTREMES FOR CURRENT YEAR.--Maximum discharge, 988 ft'is (28.0 m'is), Oct. 10, gage height, 9.25 ft (2.819 m) from rating curve extended above 500 ft'is (14.2 m'/s) on basis of step-backwater analysis and logarithmic extension; minimum daily discharge 2.8 ft'/s (0.079 m'/s), July 30,31. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 36 24 e13 e8.6 6.1 5.8 6.8 6.2 6.4 3.9 3.6 6.1 2 17 22 e13 e8.2 6.1 5.6 5.9 6.2 9.9 3.8 3.9 13 3 15 20 e13 e8.0 6.1 4.7 5.7 6.2 6.7 3.8 4.3 14 4 21 19 e12 e7.6 6.3 4.3 6.2 6.2 5.4 4.0 9.6 14 5 20 18 e12 e7.4 6.2 4.4 6.0 6.2 4.7 4.0 10 12 6 20 18 e12 e7.2 6.2 4.7 5.9 6.2 4.3 4.2 9.9 6.6 7 19 16 e12 e7.2 6.1 5.7 6.0 6.3 4.0 4.0 9.6 6.4 8 18 17 e12 e7.0 6.0 5.6 5.1 6.4 3.9 3.9 4.9 6.5 9 14 17 e12 e7.0 5.7 5.7 4.6 6.3 4.2 3.8 4.1 14 10 120 17 ell e6.9 5.8 5.1 4.9 6.3 4.2 3.7 4.2 17 11 63 17 ell e6.6 5.8 4.6 5.9 6.3 4.1 7.1 12 14 12 42 26 e10 e6.6 5.7 7.6 5.9 6.2 4.0 7.3 11 7.8 13 35 20 e9.8 e6.5 4.7 6.9 6.0 5.4 4.0 4.3 9.3 7.7 14 26 17 e9.6 e6.5 4.3 6.4 6.1 4.9 4.2 4.3 9.3 7.1 15 23 17 e9.2 e6.5 4.4 6.0 5.3 5.1 4.6 4.1 8.1 13 16 19 17 e8.8 e6.3 4.7 5.1 4.8 6.0 4.5 4.3 4.0 14 17 18 35 e8.6 e6.4 6.0 4.8 4.6 5.9 8.9 4.1 3.8 15 18 18 44 e8.9 e6.3 5.6 4.6 4.7 5.9 7.2 3.8 3.9 18 19 17 32 e8.4 e6.3 4.5 4.4 5.5 5.1 5.0 4.0 11 20 20 17 23 e8.2 e6.8 3.6 7.6 5.6 4.6 4.6 3.9 11 21 21 18 26 e8.4 6.8 3.8 6.2 5.0 4.5 4.3 3.9 59 69 22 17 28 e8.2 6.6 5.2 6.7 4.9 4.3 4.6 4.4 15 52 23 28 26 e8.8 6.7 5.5 6.2 4.5 4.7 5.0 4.5 18 158 24 49 19 e9.0 6.9 4.9 5.2 4.5 5.0 4.9 4.7 16 268 25 42 16 e8.8 7.1 4.4 4.8 4.6 5.3 4.8 4.4 14 88 26 68 16 e8.6 7.0 4.3 4.7 5.6 6.0 4.6 3.8 14 53 27 113 14 e8.4 6.9 4.6 6.0 5.6 6.0 4.4 3.5 12 37 28 126 e14 e8.4 6.6 5.9 6.5 5.7 5.9 4.2 3.2 12 32 29 50 e14 e8.8 6.5 --- 7.5 6.1 5.5 4.0 3.0 e25 31 30 38 e13 e9.0 6.3 11 6.2 5.3 4.0 2.8 e12 99 31 38 --- e8.8 6.2 8.8 --- 6.7 --- 2.8 6.1 --- TOTAL 1165 622 309.7 213.5 148.5 183.2 164.2 177.1 149.6 127.3 350.6 1134.2 MEAN 37.6 20.7 9.99 6.89 5.30 5.91 5.47 5.71 4.99 4.11 11.3 37.8 MAX 126 44 13 8.6 6.3 11 6.8 6.7 9.9 7.3 59 268 MIN 14 13 8.2 6.2 3.6 4.3 4.5 4.3 3.9 2.8 3.6 6.1 AC-FT 2310 1230 614 423 295 363 326 351 297 252 695 2250 CFSM .75 .42 .20 .14 .11 .12 .11 .11 .10 .08 .23 .76 IN. .87 .46 .23 .16 .11 .14 .12 .13 .11 .10 .26 .85 CAL YR 1988 TOTAL 6163.2 MEAN 16.8 MAX 527 MIN 3.4 AC-FT 12220 CFSM .34 IN. 4.60 WTR YR 1989 TOTAL 4744.9 MEAN 13.0 MAX 268 MIN 2.8 AC-FT 9410 CFSM .26 IN. 3.54 e Estimated RIO JACAGUAS BASIN 257 50111500 RIO JACAGUAS AT JUANA DIAZ, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS APRIL 1984 TO SEPTEMBER 1985, OCTOBER 1987 TO CURRENT YEAR STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) OCT,06 1242 19 301 31.5 MAY, 01 1248 6.2 371 31.0 DEC, 07 1204 13 372 27.5 JUN, 08 1134 4.0 346 30.0 JAN, 10 1119 7.2 362 25.5 JUL, 13 1355 4.3 337 33.0 MAR, 10 1221 4,9 354 29.5 AUG, 11 1002 4.3 360 29.0 ABR, 03 1352 4.8 406 32.0 SEP, 07 1208 7.1 332 30.0 258 RIO JACAGUAS BASIN 50111750 RIO JACAGUAS BELOW QUEBRADA GUANABANA, PR LOCATION.--Lat 18°01'53", long 66°30'28", Hydrologic Unit 21010004, on right bank, off a dirt road, 0.2 mi (0.3 km) south of Hwy 510, 1.0 mi (1.6 km) north of Fort Allen Naval Radio Station and 1.2 mi (1.9 km) east of EstaciOn Experimental Agricola UPR. DRAINAGE AREA.--56.3 mil (145.8 km') WATER-DISCHARGE RECORDS PERIOD OF RECORD.--January to September 1989. GAGE.--Water-stage recorder. Elevation of gage is 69 ft (21 m), from topographic map. REMARKS.--Records poor. EXTREMES FOR CURRENT PERIOD.--Maximum discharge 1,000 ft'is (28.3 m'/s), Sept. 24, estimated based on a mean daily discharge correlation with station 50111500, 2.6 miles upstream; no flow many days. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 .46 .00 5.9 .13 .00 .00 .00 2.1 2 .50 .00 4.7 .00 .00 .00 .00 2.8 3 .46 .00 3.1 .00 .00 .00 .00 8.3 4 .46 .00 3.4 .00 .00 .00 .00 6.8 5 .43 .00 3.4 .08 .00 .00 .00 8.0 6 .36 .00 3.3 .05 .00 .00 .00 3.3 7 .28 .00 3.4 .05 .00 .00 .00 1.8 8 .39 .00 3.2 .02 .00 .00 .00 1.7 9 .60 .00 2.5 .0 .00 .00 .00 1.3 10 .74 .00 2.3 .04 .00 .00 .00 4.4 11 .78 .00 3.0 .00 .00 .00 .00 8.0 12 .78 5.8 .91 .00 .00 .00 2.2 3.2 13 .78 2.9 .96 .00 .00 .00 3.4 1.9 14 .60 3.1 1.0 .00 .00 .00 1.5 1.6 15 .54 1.3 1.0 .00 .00 .00 1.7 6.8 16 .57 1.1 .89 .00 .00 .00 .46 13 17 .82 .91 1.0 .00 .00 .00 .00 14 18 1.0 .72 1.1 .00 .00 .00 .00 16 19 .90 .57 1.1 .00 .00 .00 .00 21 20 .86 11 1.3 .00 .00 .00 1.1 29 21 .78 2.4 1.4 .00 .00 .00 35 72 22 .66 .69 1.3 .00 .00 .00 33 e60 23 .60 .81 1.2 .00 .00 .00 12 e100 24 .54 .23 1.1 .00 .00 .00 21 e200 25 .36 .04 1.1 .00 .00 .00 14 e100 26 --- .18 .00 .94 .00 .00 .00 13 e50 27 .57 .0 .00 .03 .00 .00 .00 13 e40 28 .54 .00 .16 .00 .00 .00 .00 14 e35 29 .54 9.2 .01 .00 .00 .00 15 e35 30 .50 7.4 .26 .00 .00 .00 9.0 e50 31 .46 24 --- .00 --- .00 3.0 --- TOTAL 15.43 72.33 54.80 0.37 0.00 0.00 192.36 897.0 MEAN .55 2.33 1.83 .012 .00 .00 6.21 29.9 MAX 1.0 24 5.9 .13 .00 .00 35 200 MIN .00 .00 .00 .00 .00 .00 .00 1.3 AC-FT 31 143 109 .7 .0 .0 382 1780 CFSM .01 .04 .03 .00 .00 .00 .11 .53 IN. .01 .05 .04 .00 .00 .00 .13 .59 e Estimated Rio Gran ei Rio Grande de Arecibo bairn - Drainage boundary Rio Grande de galas. Daem \ V11 r 0 .1\ Drainage boundary Laga C(1 Rio GudacjiDa basin? 'SABANA GRANDE \),. Logo Na ago Na ergo No JUANA 114'90 DIAZ I_ g o La t t ago Bronco, GUAYANILL. A 24 BOW° de Guayanala litahria de Tallaboo PLAYA 1297 DE PON GUANICA ENSENADA CARIBBE A N SE A EXPLANATION 125 SURFACE—WATER STATION AND NUMBER V1140 QUALITY—OF—WATER STATION AND NUMBER .SAN JUAN ARECiBo • 141 WELL AND WELL NUMBER FAJARDO.) AYAGUEZ CAGUAS. ra #osce COMMA 4 5 KILOMETERS Map area 1 5 MILES Figure 23.--South coast river basins--Rio Inabon to Rio Loco basins. I I I 260 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 i (0.6 km) upstream fro diversion canal, 0.5 mi (0.8 ka) north of Real Abajo, and 6.1 mi (9.8 km) northeast of Plaza Degetau in Ponce. DRAINAGE AREA.--9.70 i 2 (25.12 km 2). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--1962-63 (annual low-flow measurements only), February to June 1964 (monthly measurements only), 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. Prior to April 1971 nonrecording gage and crest-stage gage at different datum. REMARKS.--Records fair except those for estimated daily discharges, which are poor. Gage-height and precipitation satellite telemetry at station. AVERAGE DISCHARGE.--23 years (1965-69, 1972-89), 18.8 ft'/s (0.532 e/s), 26.32 in/yr (668 mm/yr), 13,620 acre-ft/yr (16.8 hm 3/yr); median of yearly mean discharges, 18 ft'is (0.51 m7s), 13,000 acre-ft/yr (16 hm'/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 19,000 ft'is (538 m'/s), Oct. 7, 1985, gage height, 25.3 ft (7.71 m), datum then in use, from floodmark, from rating curve extended above 30 ft'is (0.850 e/s) on basis of contracted opening and flow-over-road measurements of peak flow; minimum daily discharge, 0.80 ft'is (0.023 m'is), July 23, 1977. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 500 ft3/s (14.2 m 3/s), and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft3/s) (50/s) (ft) (m) Date Time (ft3/s) (10/s) (ft) (m) Oct. 10 1600 579 16.4 7.26 2.213 June 2 1615 736 20.8 8.63 2.630 Oct. 28 1400 672 19.0 8.08 2.444 Sept. 10 1715 *1,120 31.7 *11.80 3.600 Mar. 23 1500 741 21.0 8.67 2.636 Sept. 19 1900 646 18.3 7.85 2.393 Minimum daily discharge, 2.1 ft'/s (0.059 m 3/s), Mar. 10. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 47 23 10 5.8 3.7 e3.3 24 15 25 6.6 5.8 9.8 2 32 e21 10 5.7 3.3 e6.0 15 12 81 8.1 5.2 17 3 29 e18 e9.8 5.2 3.3 e3.0 12 12 49 6.6 4.5 17 4 26 e30 e9.4 5.0 3.3 e2.5 8.6 9.7 28 5.7 5.1 14 5 24 e45 e9.2 4.6 3.5 e2.4 7.2 8.6 16 5.6 5.6 14 6 23 e50 e9.0 4.4 4.0 e2.3 39 8.6 14 5.3 5.1 17 7 21 e25 e8.6 4.2 4.1 e2.8 36 9.3 13 5.1 4.8 14 8 21 e18 e8.2 3.8 4.7 e2.3 16 11 14 5.5 5.7 18 9 21 e16 e7.8 4.0 5.0 e2.2 11 9.8 14 4.9 5.3 46 10 80 e14 7.5 3.8 5.0 e2.1 8.7 10 13 4.3 5.9 102 11 52 e20 7.4 4.2 4.5 2.4 7.5 8.3 11 11 14 67 12 34 e35 7.1 4.2 3.6 27 6.8 7.8 10 11 11 41 13 28 e27 6.9 4.1 3.3 15 7.2 7.8 8 7 6.8 11 35 14 27 e29 6.5 3.9 3.6 8.3 5.9 8.0 7.7 6.1 7.8 29 15 31 e25 6.2 3.9 7.7 7.2 5.9 7.6 7 7 5.6 7.0 30 16 28 e20 6.0 3.9 11 4.7 5.2 7.2 7.9 5.0 7.5 27 17 24 e23 5.8 4.3 6.6 6.5 5.6 6.7 14 4.2 7.4 22 18 22 17 5.9 4.4 7.0 4.4 4.9 6.2 10 3.8 6.3 140 19 38 14 5.8 4.2 5.7 3.3 4.8 5.6 8.5 3.4 17 149 20 44 13 5.5 4.2 6.3 5.9 4.4 5.5 7.6 3.3 9.7 102 21 35 12 5.6 4.2 7.3 7.8 4.6 5.6 7.1 3.4 12 69 22 33 25 5.5 3.9 7.8 15 11 5.7 7.9 3.6 14 44 23 42 18 5.7 3.8 e7.0 40 8.0 6.1 8.4 3.4 20 66 24 38 14 6.3 3.7 e5.0 14 9.2 5.9 8.6 5.4 20 92 25 34 18 6.0 3.5 e4.0 9.2 7.0 6.3 7.1 7.7 20 49 26 50 15 5.8 3.5 e3.7 6.9 6.1 8.6 7.2 11 16 41 27 51 13 5.7 3.5 e3.5 14 10 12 6.7 7.9 10 37 28 85 12 5.6 3.4 e3.4 12 25 7.8 6.0 7.9 19 29 29 51 11 5.7 3.3 --- 14 15 11 6.2 5.6 31 26 30 36 11 6.2 3.3 19 20 18 6.1 5.2 18 56 31 29 --- 6.0 3.4 40 --- 15 --- 6.1 12 --- TOTAL 1136 632 216.7 127.3 140.9 305.5 351.6 278.7 431.4 185.1 343.7 1419.8 MEAN 36.6 21.1 6.99 4.11 5.03 9.85 11.7 8.99 14.4 5.97 11.1 47.3 MAX 85 50 10 5.8 11 40 39 18 81 11 31 149 MIN 21 11 5.5 3.3 3.3 2.1 4.4 5.5 6.0 3.3 4.5 9.8 AC-FT 2250 1250 430 252 279 606 697 553 856 367 682 2820 CFSM 3.78 2.17 .72 .42 .52 1.02 1.21 .93 1.48 .62 1.14 4.88 IN. 4.36 2.42 .83 .49 .54 1.17 1.35 1.07 1.65 .71 1.32 5.45 CAL YR 1988 TOTAL 5889.9 MEAN 16.1 MAX 274 MIN 2.5 AC-FT 11680 CFSM 1.66 IN. 22.59 WTR YR 1989 TOTAL 5568.7 MEAN 15.3 MAX 149 MIN 2.1 AC-FT 11050 CFSM 1.57 IN. 21.36 e Estimated RIO INABON BASIN 50112500 RIO INABON AT REAL ABAJO, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS AUGUST 1981 TO CURRENT YEAR STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) SEP, 27 1057 33 242 25.5 FEB, 27 1038 3.5 294 24.5 OCT, 27 1203 -- 196 27.0 MAR, 28 1346 10 300 26.5 NOV, 29 1146 11 265 25.5 ABR, 27 1041 10 255 25.5 DEC. 28 1136 5.7 275 24.5 MAY, 30 1128 11 257 25.0 JAN. 27 0837 3.7 288 22.0 SEP, 28 1210 28 247 23 261 I 262 RIO BUCANA BASIN 50113800 RIO CERRILLOS ABOVE LAGO CERRILLOS NEAR PONCE, P.R. LOCATION.--Lat 18°07'01", long 66°36'17", Hydrologic Unit 21010004, on right bank, 0.3 mi (0.5 km) downstream fro confluence with Rio San Patricio, 0.1 mi (0.2 km) southwest of Hwy 139 and 2.4 mi (3.7 ka) northwest of Maraguez. DRAINAGE AREA.-- 15.4 mil (39.9 km'). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--December 1988 to September 1989. 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 CURRENT PERIOD.--Peak discharges greater than base discharge of 600 ft)/s (17.0 m 3/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (W/s) (ma/s) (ft) (m) Date Time (ft'/s) (m'/s) (ft) (m) June 1 1715 844 23.9 3.94 1.201 Sept. 10 1700 *1,340 37.9 *4.80 1.463 June 2 1545 1,290 36.5 4.73 1.442 Sept. 26 1545 870 24.6 3.99 1.216 Minimunm discharge, 5.4 ft'/s (0.153 m'/s), all or part of each day Mar. 4-12. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 e19 8.7 5.9 26 70 39 el60 20 8.2 21 2 e19 8.7 6.2 9.2 e44 22 e200 13 7.8 100 3 e18 8.7 6.4 6.4 e30 19 138 11 8.0 70 4 e17 8.7 6.4 5.6 20 18 70 11 10 28 5 e16 8.7 6.4 5.4 16 15 47 10 8.6 21 6 e16 8.7 6.4 5.6 56 14 39 9.9 7.6 16 7 e15 8.1 6.4 5.9 48 18 31 9.8 8.2 14 8 e15 8.4 6.7 5.4 24 17 26 9.5 9.7 19 9 e14 8.6 6.9 5.4 19 14 23 8.9 7.7 49 10 e14 8.1 6.9 5.4 17 13 21 8.8 14 212 11 e14 8.4 6.9 5.4 16 13 19 28 25 137 12 e14 8.1 6.9 53 14 12 17 15 16 101 13 e13 8.0 6.7 21 14 12 15 10 13 79 14 e13 7.2 7.0 59 13 11 14 9.3 16 43 15 e13 7.5 14 24 12 10 14 8.7 11 44 16 13 7.5 12 14 12 9.9 25 8.1 14 32 17 13 7.5 7.8 14 11 9.3 52 7.8 12 26 18 13 7.5 7.6 10 11 9.0 26 7.9 19 182 19 12 7.1 6.4 8 4 11 8.7 17 8.8 71 200 20 12 7.1 6.4 34 10 8.1 14 9.3 21 163 21 12 6.9 6.4 21 11 8.1 14 8.1 108 114 22 12 6.4 6.4 52 20 7.6 14 8.1 59 81 23 12 6.4 6.0 39 12 7.5 16 8.1 41 109 24 12 6.4 5.9 19 11 7.0 14 15 51 142 25 12 6.4 5.9 14 10 9.7 13 e42 71 84 26 11 6.4 7.2 11 12 25 12 e20 48 154 27 9.6 6.4 7.9 14 17 15 11 16 18 137 28 9.4 6.4 6.8 70 54 9.4 11 12 57 88 29 9.4 6.4 --- 91 38 15 13 8.6 73 69 30 9.4 6.0 e96 76 40 10 8.1 32 105 31 9.3 5.9 102 --- 20 --- 8.3 18 --- TOTAL 411.1 231.3 198.8 852.1 729 456.3 1096 379.1 883.8 2640 MEAN 13.3 7.46 7.10 27.5 24.3 14.7 36.5 12.2 28.5 88.0 MAX 19 8.7 14 102 76 40 200 42 108 212 MIN 9.3 5.9 5.9 5.4 10 7.0 10 7.8 7.6 14 AC-FT 815 459 394 1690 1450 905 2170 752 1750 5240 CFSM .86 .48 .46 1.78 1.58 .96 2.37 .79 1.85 5.71 IN. .99 .56 .48 2.06 1.76 1.10 2.65 .92 2.13 6.38 e Estimated 263 RIO BUCANA BASIN 50114000 RIO CERRILLOS NEAR PONCE, PR Location.--Lat 18°04'15", long 66°34'51", Hydrologic unit 21010004, on right bank off Highway 139, 2.3 mi (3.7 km) upstream from Quebrada Ausubo and 4.6 mi (7.4 km) northeast of Plaza Degetau in Ponce. DRAINAGE AREA.--17.8 mi' (46.1 km') WATER-QUALITY RECORDS PERIOD OF RECORD.--Water years 1964 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1988 07... 1145 11 273 8.40 28.0 20 6.3 80 12 20 K150 DEC 09... 1215 15 286 7.70 23.0 22 10.2 118 14 30 K140 FEB 1989 10... 1045 10 306 7.50 24.0 19 9.7 114 <10 20 50 APR 7... 1140 50 215 7.40 22.5 180 6.8 78 <10 K1500 2700 JUN 8... 1055 29 286 7.50 24.0 45 8.0 94 33 70 3500 AUG 29... 1115 40 255 8.10 26.0 120 7.5 92 13 K910 2800 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SLUM, SODIUM, AD- SIUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1988 07... 110 11 35 6.5 9.8 0.4 1.2 120 <0.5 18 8.0 DEC 9... 130 FEB 1989 10... 120 APR 07... 95 9 30 4.9 7.9 0.4 1.1 160 1.6 15 6.4 JUN 08... 130 AUG 29... 120 35 6.8 10 0.4 1.3 130 19 7.4 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 07... 0.1 23 160 5.0 5 0.39 0.01 0.40 0.03 0.37 DEC 29... 12 0.89 0.01 0.90 0.01 0.19 FEB 1989 10... 44 0.68 0.02 0.70 0.02 0.38 APR 07... 0.1 20 137 19 265 0.89 0.01 0.90 0.02 0.18 JUN 08... 48 <0.01 0.80 0.01 AUG 29... 0.1 22 162 17 192 0.65 0.05 0.70 0.12 0.28 K = non-ideal count 264 RIO BUCANA BASIN 50114000 RIO CERRILLOS NEAR PONCE, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (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 NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1988 07... 0.4 0.8 3.5 0.03 <1 <100 30 <1 3 <10 DEC 29... 0.2 1.1 4.9 0.04 FEB 1989 10... 0.4 1.1 4.9 0.03 -- APR 07... 0.2 1.1 4.9 0.04 <1 300 30 1 4 20 JUN 08... <0.2 0.03 AUG 29... 0.4 1.1 4.9 0.13 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- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1988 07... 760 <1 50 <0.1 <1 <1 20 <0.01 <1 0.02 DEC 9... FEB 1989 10... APR 7... 6800 <5 220 <0.1 <1 2 30 <0.01 <1 0.06 JUN 8... AUG 29... 265 RIO BUCANA BASIN 50114390 RIO BUCANA AT HWY 14 BRIDGE NEAR PONCE, PR 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 Degetau Plaza in Ponce. DRAINAGE AREA.--24.9 mil (64.5 km2). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--October 1985 to September 1986 (maximum only), published as "Rio Bucana Floodway Channel at Highway 14 bridge", October 1986 to July 1987 (maximum only), August 1987 to current year. GAGE.--Water-stage recorder and crest-stage gage. Elevation 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 level. REMARKS.--Records fair. Only minor regulation of low flow at present. Gage-height and precipitation satellite telemetry at station. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge 17,400 ft'is (493 m 3/s), Oct. 7, 1985, gage height, 13.48 ft (4.109 m), (previously published as 129.88 ft (39.59 m) ms1) from floodmark and rating curve extended above 200 ft'is (5.66 m)/s), on basis of step-backwater analysis; minimum daily discharge, 5.4 ft3/s (0.153 m3/s), June 7, 1988, result of regulation. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,600 ft'/s (45.3 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft3/s) (m'/s) (ft) (m) Date Time (ft3/s) (m 3/s) (ft) (m) Nov. 25 1815 1,690 47.9 4.63 1.411 Aug. 21 2015 1,710 48.4 4.66 1.420 Mar. 23 1615 1,870 53.0 4.86 1.481 Sept. 10 1915 3,780 107 6.71 2.045 June 1 1915 2,400 68.0 5.45 1.661 Sept. 19 2030 *5,040 143 *7.66 2.335 June 2 1800 2,840 80.4 5.88 1.792 Sept. 26 1815 2,330 66.0 5.37 1.637 Minimum daily discharge, 5.4 ft'is (0.153 e/s), Mar. 9. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 78 73 25 13 7.3 7.3 157 94 357 12 11 21 2 64 57 23 13 7.2 22 73 42 700 19 10 226 3 41 34 23 12 6.8 7.6 72 27 471 13 10 195 4 34 52 22 13 6.8 6.3 45 20 190 14 12 56 5 28 63 20 12 6.9 6.3 28 17 79 15 11 32 6 29 97 20 12 6.7 6.4 18 13 51 17 10 24 7 24 51 19 11 6.4 7.2 98 13 49 16 9 2 18 8 22 33 18 12 6.8 5.8 42 22 36 14 13 17 9 23 25 18 12 6.0 5.4 22 13 29 11 11 38 10 32 22 19 11 5.9 5.5 17 14 27 16 9 7 531 11 83 26 19 10 6.4 6.5 16 12 22 22 23 477 12 28 78 16 11 6.5 27 12 10 19 43 22 244 13 28 53 17 10 6.1 76 12 9.9 17 14 18 192 14 24 59 16 9.9 5.9 40 11 10 18 11 14 80 15 38 49 15 9.5 6.6 87 10 10 18 9.8 18 50 16 93 37 15 9.1 16 28 9.2 9.1 18 9.6 14 63 17 40 33 16 9.6 12 22 9.4 8.3 32 8.8 20 47 18 24 40 16 9.3 9.6 16 8.1 7.5 67 8.4 17 518 19 32 26 14 7.7 8.4 13 7.6 7.0 34 8.4 69 953 20 120 22 15 8.6 6.8 13 7.4 6.8 21 9.7 34 714 21 101 19 13 9.5 7.4 45 7.0 7.1 19 9.5 266 368 22 64 58 13 8.1 7.0 28 15 7.1 18 11 186 247 23 40 86 13 8.0 6.2 264 9.0 6.4 21 9.7 45 493 24 79 38 14 8.0 5.9 54 8.3 6.4 18 13 71 647 25 55 270 17 7.5 6.7 30 7.8 6.8 17 17 82 231 26 133 154 14 7.9 6.4 15 7.2 13 15 40 119 455 27 176 59 13 8.5 8.3 13 18 25 14 17 43 433 28 191 46 13 8.4 7.9 59 18 11 12 20 40 203 29 107 33 13 8.1 --- 199 73 19 13 12 291 139 30 97 26 13 7.7 182 73 29 13 10 97 227 31 123 --- 14 7.5 190 --- 45 --- 11 42 --- TOTAL 2051 1718 516 304.9 206.9 1487.3 911.0 541.4 2415 461.9 1637.9 7939 MEAN 66.2 57.3 16.6 9.84 7.39 48.0 30.4 17.5 80.5 14.9 52.8 265 MAX 191 270 25 13 16 264 157 94 700 43 291 953 MIN 22 19 13 7.5 5.9 5.4 7.0 6.4 12 8.4 9.2 17 AC-FT 4070 3410 1020 605 410 2950 1810 1070 4790 916 3250 15750 CFSM 2.66 2.30 .67 .39 .30 1.93 1.22 .70 3.23 .60 2.12 10.6 IN. 3.06 2.57 .77 .46 .31 2.22 1.36 .81 3.61 .69 2.45 11.86 CAL YR 1988 TOTAL 16616.6 MEAN 45.4 MAX 2140 MIN 5.4 AC-FT 32960 CFSM 1.82 IN. 24.82 WTR YR 1989 TOTAL 20190.3 MEAN 55.3 MAX 953 MIN 5.4 AC-FT 40050 CFSM 2.22 IN. 30.16 266 RIO BUCAMA BASIN 50114390 RIO BUCANA AT HWY 14 BRIDGE NEAR PONCE. PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--OCTOBER 1987 TO SEPTEMBER 1988 TO CURRENT YEAR STREAMFLOW. SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA­ DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) OCT. 05 1423 25 294 31.0 ABR. 05 1302 25 328 26.5 NOV. 02 1537 -- 265 26.0 MAY, 04 0854 20 327 23.5 DEC. 07 1508 19 283 27.0 JUN. 02 1336 77 337 25.0 JAN. 04 1206 12 301 25.0 JUL. 13 1134 15 327 27.5 FEB. 08 0934 6.8 306 23.5 AUG. 09 1512 10 380 27.5 MAR, 10 0940 5.6 312 25.5 SEP. 06 1240 23 317 29.0 I I 267 RIO PORTUGUES BASIN 50115000 RIO PORTUGUES NEAR PONCE, PR LOCATION.--Lat 18'04'45', long 66°381 01", Hydrologic Unit 21010004, on right bank 30 ft (9 m) upstream from bridge on Highway 504, 0.2 mi (0.3 km) upstream from small unnamed tributary, 4.4 mi (7.1 km) upstream from Rio Chiquito, and 4.7 mi (7.6 km) north of Plaza Degetau in Ponce. DRAINAGE AREA.--8.82 mi' (22.84 km2). WATER-DISCHARGE RECORDS PERIOD OF 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.--25 years (1965-89), 19.1 ft'/s (0.541 m'/s), 29.41 in/yr (747 mm/yr), 13,840 acre-ft/yr (17.1 he/yr); median of yearly mean discharges, 18.6 ft'is (0.53 m'/s), 13,500 acre-ft/yr (17 he/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 21,000 ft'is (595 m'/s), Oct. 7, 1985, gage height, 20.2 ft (6.16 m), fro floodmarks at downstream side of bridge, from rating curve extended above 150 ft'is (4.25 '/s) on basis of slope-area measurement of peak flow; minimum discharge, 1.0 ft'/s (0.028 m'/s), May 29, 1973. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 800 ft'is (22.6 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (W/s) (e/s) (ft) (m) Date Time (WA) (m'/s) (ft) (m) Nov. 5 1745 1,180 33.4 6.62 2.018 Aug. 21 1615 1,260 35.7 6.88 2.097 June 1 1730 *2,380 67.4 *8.88 2.707 Sept. 19 1845 1,910 54.1 8.09 2.466 June 2 1615 1,680 47.6 7,66 2.335 Sept. 26 1615 1,940 54.9 8.15 2.484 Minimum discharge, 2.0 ft'is (0.057 m'/s), Feb. 10. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 22 24 12 5.1 2.5 7.2 37 17 270 25 20 27 2 18 18 12 5.0 2.4 4.5 27 12 222 15 24 90 3 18 33 11 4.8 2.4 3.0 21 9.3 163 13 26 61 4 15 22 11 5.1 2.2 2.9 13 8.0 72 16 44 33 5 14 115 11 5.1 2.3 2.8 11 6.4 36 12 29 23 6 13 57 10 4.8 2.2 2.8 8.4 5.9 24 12 29 19 7 12 21 9.9 4.6 2.2 3.0 9.7 5.9 21 16 44 16 8 11 15 9.7 4.2 2.2 2.9 8.4 7.1 19 12 34 20 9 10 12 9.5 4.6 2.2 3.1 7.7 6.0 24 15 20 44 10 29 9.6 9.7 4.0 2.3 3.3 7.6 5.5 14 13 41 127 11 19 15 9.7 3.7 2.5 3.2 7.3 5.3 20 32 55 78 12 15 12 9.0 3.6 2.4 25 6.5 5.1 18 13 45 61 13 13 9.5 8.8 3.6 2.4 11 6.8 4.8 10 11 38 54 14 14 8.3 8.3 3.4 2.3 26 6.5 4.7 9.9 10 36 36 15 24 10 8.1 3.3 3.3 14 6.1 4.8 11 9.7 35 27 16 16 8.6 8.1 3.3 4.3 10 5.6 4.6 78 9.2 35 21 17 13 8.9 7.8 3.4 2.9 8.3 5.6 4.3 55 9.2 37 18 18 24 7.7 7.7 3.4 2.8 5.2 5.5 4.2 37 9.9 43 98 19 28 6.2 7.2 3.3 2.6 4.8 5.3 4.0 19 11 113 252 20 41 5.5 6.8 3.3 2.7 8.7 4.7 4.1 14 11 85 144 21 29 5.6 6.7 3.4 2.8 9.6 4.4 4.2 12 11 194 66 22 19 13 6.6 3.1 2.8 12 5.9 4.1 17 11 59 49 23 37 8.4 6.8 2.9 2.5 13 4.7 3.9 17 11 53 86 24 34 5.7 6.7 2.9 2.6 7.6 4.5 4.0 13 9.8 62 91 25 21 61 6.7 2.9 2.6 5.4 4.5 9.9 13 21 69 55 26 26 51 6.3 2.9 2.9 4.2 7.4 8.6 13 12 59 187 27 35 25 5.9 2.8 2.8 4.4 12 6.6 13 14 30 81 28 47 17 5.9 2.8 3.3 33 10 6.0 27 25 46 55 29 58 14 5.6 2.7 --- 39 12 12 18 17 75 46 30 72 13 5.3 2.6 35 25 24 18 20 47 88 31 46 --- 5.2 2.5 47 --- 20 --- 21 31 --- TOTAL 793 632.0 255.0 113.1 73.4 361.9 301.1 232.3 1297.9 447.8 1558 2053 MEAN 25.6 21.1 8.23 3.65 2.62 11.7 10.0 7.49 43.3 14.4 50.3 68.4 MAX 72 115 12 5.1 4.3 47 37 24 270 32 194 252 MIN 10 5.5 5.2 2.5 2.2 2.8 4.4 3.9 9.9 9.2 20 16 AC-FT 1570 1250 506 224 146 718 597 461 2570 888 3090 4070 CFSM 2.90 2.39 .93 .41 .30 1.32 1.14 .85 4.91 1.64 5.70 7.76 IN. 3.34 2.67 1.08 .48 .31 1.53 1.27 .98 5.47 1.89 6.57 8.66 CAL YR 1988 TOTAL 5870.1 MEAN 16.0 MAX 551 MIN 2.5 AC-FT 11640 CFSM 1.82 IN. 24.76 WTR YR 1989 TOTAL 8118.5 MEAN 22.2 MAX 270 MIN 2.2 AC-FT 16100 CFSM 2.52 IN. 34.24 268 RIO PORTUGUES BASIN 50115000 RIO PORTUGUES NEAR PONCE, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORD.--Water years 1964 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 DIS- OXYGEN, OXYGEN COLI- STREP­ CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1988 07... 0920 13 300 8.20 25.0 1.7 7.9 96 <10 280 470 DEC 09... 1010 9.8 322 7.80 20.5 0.7 9.0 101 <10 54 220 FEB 1989 10... 0910 2.1 330 7.60 20.0 0.6 8.9 98 <10 K120 K130 APR 7... 0850 9.1 281 7.60 21.0 3.5 8.0 90 <10 370 290 JUN 8... 0845 17 276 8.00 22.0 0.7 8.7 99 41 K82 580 AUG 24... 1005 61 207 8.00 23.0 1.5 8.1 95 <10 3800 5000 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SIUM, SODIUM, AD- SIUM, WAT WH SULFATE RIDE, TOTAL WH WAT D1S- DIS- D1S- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1988 07... 130 10 40 6.9 9.5 0.4 1.3 140 <0.5 8.3 9.3 DEC 9... 140 FEB 1989 10... 150 APR 7... 130 5 39 8.3 9.4 0.4 1.2 120 <0.5 9.5 7.9 JUN 8... 120 AUG 24... 120 4 37 6.5 9.0 0.4 1.4 84 7.8 7.4 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 07... 0.1 19 182 6.1 4 0.89 0.01 0.90 0.01 0.29 DEC 9... 5 <0.01 1.00 <0.01 FEB 1989 10... 3 0.69 0.01 0.70 0.03 0.27 APR 7... 0.1 22 174 4.3 5 <0.01 1.10 0.02 JUN 8... <1 <0.01 1.30 <0.01 AUG 24... 0.1 20 160 26 <1 0.99 0.01 1.00 0.01 0.39 K • non-ideal count RIO PORTUGUES BASIN 50115000 RIO PORTUGUES NEAR PONCE, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (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 NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1988 07... 0.3 1.2 5.3 0.03 <1 <100 20 <1 1 <10 DEC 9... <0.2 0.04 FEB 1989 10... 0.3 1.0 4.4 0.04 APR 7... <0.2 0.03 3 100 20 1 2 <10 JUN 8... <0.2 0.03 AUG 24... 0.4 1.4 6.2 0.05 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- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1988 07... 160 2 20 0.1 <1 <1 <10 <0.01 2 0.03 DEC 9... FEB 1989 10... APR 7... 240 <5 <10 0.1 <1 1 <10 <0.01 1 0.03 JUN 8... AUG 24... 269 270 RIO PORTUGUES BASIN 50116200 RIO PORTUGUES AT PONCE, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°00'20", long 66°36'28", 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' (49.0 km'). PERIOD OF RECORD.--Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1988 18... 0915 14 475 7.50 24.5 8.5 5.9 70 15 20000 K1700 DEC 19... 0850 13 525 7.00 22.5 15 6.9 78 17 K16000 K1700 FEB 1989 22... 0925 5.9 541 6.90 22.0 9.4 5.1 58 15 K7900 K1300 APR 18... 0915 8.8 535 7.30 21.5 4.5 5.8 64 <10 4800 590 JUN 14... 0925 7.3 420 7.90 25.0 4.6 5.6 66 14 4700 220 AUG 22... 0915 89 224 8.00 23.0 34 8.8 102 37 K2400 8400 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SLUM, SODIUM, AD- S1UM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1988 18... 170 17 48 12 35 1 1.8 150 <0.5 47 26 DEC 19... 150 FEB 1989 22... 130 APR 18... 160 21 46 11 49 2 1.9 130 <0.5 73 38 JUN 14... 130 AUG 22... 86 26 5.2 10 0.5 1.7 80 -- 13 10 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 18... 0.1 21 283 11 29 0.90 0.10 1.00 0.26 0.44 DEC 19... 34 0.64 0.06 0.70 0.19 0.51 FEB 1989 22... 19 0.42 0.08 0.50 0.33 0.77 APR 18... 0.2 19 321 7.7 2 0.33 0.07 0.40 0.18 0.42 JUN 14... 16 0.08 0.02 0.10 0.09 0.41 AUG 22... 0.1 18 132 32 25 1.88 0.02 1.90 0.04 0.46 K non-ideal count RIO PORTUGUES BASIN 50116200 RIO PORTUGUES AT PONCE, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (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 NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1988 18... 0.7 1.7 7.5 0.17 <1 <100 100 <1 <1 <10 DEC 19... 0.7 1.4 6.2 0.12 FEB 1989 22... 1.1 1.6 7.1 0.20 APR 18... 0.6 1.0 4.4 0.15 <1 100 180 1 1 10 JUN 14... 0.5 0.6 2.7 0.09 AUG 22... 0.5 2.4 8.2 0.09 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- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1988 18... 850 <5 300 <0.1 <1 1 10 <0.01 3 0.03 DEC 19... FEB 1989 22... APR 18... 610 <5 90 <0.1 <1 <1 <10 <0.01 <1 0.07 JUN 14... AUG 22... 271 272 RIO GUAYANILLA BASIN 50124200 RIO GUAYANILLA NEAR GUAYANILLA, PR LOCATION.--Lat 18°02'40", long 66°47'53", Hydrologic Unit 21010004, on left bank, 0.7 mi (1.1 km) north of junction of Highways 2 and 132, 0.6 mi (1.0 km) downstream from Quebrada Consejo, 1.8 mi (2.9 km) north-northwest from Plaza de Guayanilla. DRAINAGE AREA.--18.9 mil (49.0 km 2). 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. Gage-height and precipitation satellite telemetry at station. AVERAGE DISCHARGE.--8 years (1982-89), 24.1 ft'is (0.682 m'/s), 17.32 in/yr (440 mm/yr), 17,460 acre-ft/yr (21.5 hm'/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 14,700 ft'/s (416 m'/s), Sept. 12, 1982, gage height, 20.4 ft (6.21 m), from floodmarks, from rating curve extended above 100 ft'/s (2.83 m'/s) on basis of step-backwater analysis and indirect measurement of peak flow; minimum discharge, 1.6 ft'/s (0.045 m'/s), Aug. 16, 1988. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 800 ft'/s (22.7 10/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (m'/s) (ft) (m) Date Time (ft'/s) (m 3/s) (ft) (m) Apr. 4 1700 944 26.7 9.62 2.932 Sept. 2 1600 840 23.8 9.37 2.856 June 2 1645 1,010 28.6 9.78 2.981 Sept. 26 1730 1,020 28.9 9.79 2.984 Aug. 31 1430 *1,120 31.7 *10.00 3.048 Minimum discharge, 2.1 ft'is (0.059 10/s), Mar. 9-11. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 39 28 10 7.1 6.0 3.1 36 7.6 39 8.4 9.3 56 2 37 26 11 6.8 5.6 3.9 112 6.5 109 12 8.1 169 3 38 25 11 7.0 4.9 3.3 66 8.7 45 8.6 8.9 93 4 34 24 10 7.2 8.6 3.2 118 6.8 29 6.4 11 51 5 31 43 10 7.2 9.5 2.9 49 7.6 16 6.9 6.6 39 6 29 54 11 6.5 4.9 2.9 25 14 11 22 5.4 33 7 26 34 11 6.1 3.9 3.0 19 8.8 8.9 13 7.3 29 8 25 28 11 17 3.7 2.5 16 7.8 7.9 9.5 15 31 9 24 25 11 15 3.9 2.3 13 6.6 6.4 10 6.5 91 10 23 23 12 8.5 3.7 2.1 12 6.5 5.7 24 25 131 11 21 21 12 7.5 3.9 2.5 11 6.1 5.1 18 29 97 12 23 24 11 7.7 4.6 21 10 5.5 4.2 9.5 13 68 13 22 23 12 7.2 4.2 12 10 5.5 4.6 6.7 11 52 14 20 20 12 6.8 3.2 34 9 6 5.2 4.2 6.1 13 44 15 23 19 13 6.8 3.7 26 8 4 4.9 4.2 5.1 13 40 16 19 19 14 7.0 7.4 15 7.8 4.9 37 5.8 11 38 17 16 20 16 7.0 8.9 8.0 7.2 4.4 42 7.3 23 40 18 26 18 16 7.4 5.3 3.8 6.6 4.3 23 7.2 28 71 19 25 15 16 7.4 3.4 2.9 6.0 4.0 15 7.0 79 160 20 18 14 16 7.2 2.9 3.3 5.8 3.6 9.5 8.2 29 116 9.8 5.7 44 69 22 14 17 19 6.5 3.1 4.5 6.0 3.5 8.6 7.2 52 57 23 53 15 23 6.1 3.0 20 5.5 3.7 8.3 13 21 18 13 14 7.0 2.7 9.0 5.6 3.5 27 132 24 54 12 7.9 6.1 2.7 13 5.4 4.1 9.2 14 32 101 25 35 18 11 5.7 2.6 6.4 7.7 4.3 7.7 18 56 63 26 52 20 9.0 6.4 3.9 4.8 7,4 8.8 7.8 14 72 152 27 77 14 8.3 7.5 6.0 26 19 8.9 6.5 8.8 35 106 28 53 12 7.5 8.0 3.8 42 17 10 9.8 8.2 40 68 29 54 11 8.2 6.9 --- 32 9.1 7.3 16 8.9 57 58 30 45 10 8.3 5.8 46 10 14 10 25 45 62 31 34 --- 7.8 5.0 48 8.5 --- 14 --- 116 --- 928.1 2317 MEAN 32.5 21.5 11.9 7.46 4.64 13.2 21.4 6.64 17.3 10.9 29.9 77.2 MAX 77 54 23 17 9.5 118 14 109 TOTAL 1008 645 370.0 231.4 130.0 409.4 641.1 205.9 520.4 338.5 48 25 116 169 MIN 14 10 7.5 5.0 2.6 2.1 5.4 3.5 4.2 5.1 5.4 29 AC-FT 2000 1280 734 459 258 812 1270 408 1030 671 1840 4600 CFSM 1,72 1.14 .63 .39 .25 .70 1.13 .35 .92 .58 1.58 4.09 IN. 1.98 1.27 .73 .46 .26 .81 1.26 .41 1.0? .67 1.83 4.56 CAL YR 1988 TOTAL 6773.3 MEAN 18.5 MAX 762 MIN 1.7 AC-FT 13430 CFSM .98 IN. 13.33 WTR YR 1989 TOTAL 7744.8 MEAN 21.2 MAX 169 MIN 2.1 AC-FT 15360 CFSM 1.12 IN. 15.24 RIO GUAYANILLA BASIN 50124200 RIO GUAYANILLA NEAR GUAYANILLA, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS AUGUST 1981 TO SEPTEMBER 1985. OCTOBER 1981 TO CURRENT YEAR STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE LURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (OEG C) (CFS) (UMHOS) (DEG C) OCT, 04 1251 35 382 29.0 ABR, 04 1438 29 369 27.0 NOV. 02 1158 -- 378 29.0 MAY. 02 0755 710 431 23.0 DEC. 06 1204 12 361 28.0 JUN, 05 1212 18 465 30.0 JAN. 05 1158 8.1 360 27.0 JUL. 12 1014 9.9 446 27.5 FEB. 07 1242 4.4 412 28.0 AUG. 08 1159 12 310 29.0 MAR. 08 1019 2.8 399 26.5 SEP, 13 1111 53 440 26.0 273 274 RIO GUAYANILLA BASIN 50124700 RIO GUAYANILLA AT CENTRAL RUFINA, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°00'40", long 66°46'49", 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 mil (59.1 km 2). PERIOD OF RECORD.--Water years 1960-65, 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1988 04... 0940 29 430 8.00 25.0 2.0 5.1 61 <10 5400 2200 DEC 20... 1030 2 714 7.30 24.0 4.0 3.5 41 37 80 K130 FEB 1989 07... 0915 1.4 884 6.90 23.0 10 1.4 16 63 600 820 APR 4... 0935 27 400 7.40 23.0 3.5 7.9 90 <10 2900 4700 JUN 5... 1020 10 437 7.40 26.5 4.0 7.2 88 22 3000 470 AUG 01... 0910 4 495 7.50 26.5 11 6.0 73 17 K130 K91 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SLUM, SODIUM, AD- SIUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- OIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1988 04... 200 33 52 16 15 0.5 1.7 160 <0.5 41 16 DEC 20... 240 FEB 1989 07... 260 APR 04... 180 38 47 14 14 0.5 1.8 130 <0.5 36 15 JUN 05... 160 AUG 01... 190 33 53 15 26 0.8 3.0 160 44 23 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEM, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2tNO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 04... 0.1 19 259 20 12 0.78 0.02 0.80 0.58 0.22 DEC 20... 11 0.39 0.21 0.60 5.40 1.3 FEB 1989 07... 11 0.02 <0.10 13.0 0.0 APR 04... 0.1 20 230 17 6 1.58 0.02 1.60 0.59 0.41 JUN 05... <1 0.67 0.03 0.70 1.50 0.80 AUG 01... 0.1 21 282 3.1 18 2.79 0.01 2.80 0.04 4.4 K = non-ideal count RIO GUAYANILLA BASIN 50124700 RIO GUAYANILLA AT CENTRAL RUFINA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM. COPPER. MONIA • NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (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 NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1988 04... 0.8 1.6 7.1 0.16 1 <100 20 <1 <1 <10 DEC 20... 6.7 7.3 32 1.40 FEB 1989 07... 12 2.60 APR 04... 1.0 2.6 12 0.20 1 100 20 <1 2 <10 JUN 05... 2.3 3.0 13 0.39 AUG 01... 4.4 7.2 32 0.83 KANGA- 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- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS P8) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1988 04... 300 <5 40 <0.1 <1 <1 <10 <0.01 <1 0.09 DEC 20... FEB 1989 07... APR 4... 480 <5 30 <0.1 <1 <1 <10 <0.01 <1 0.13 JUN 5... AUG 01... PESTICIDE ANALYSES CHLOR- DI- DI- ENDO- PCB. ALDRIN, DANE. DOD. ODE. DDT, AZINON, ELDRIN SULFAN, DATE 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) JUN 05... 1020 <0.1 <0.01 <0.1 <0.01 <0.01 <0.01 0.03 <0.01 <0.01 HEPTA- METH- METHYL METHYL HEPTA- CHLOR MALA- OXY- PARA- TRI- ENDRIN, ETHION, CHLOR. EPDXIDE LINDANE THION. CHLOR. THION. THION, MIREX. DATE 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) JUN 05... <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 MPH- THA- LENES. PARA- POLY- PER- TOX- TOTAL THION, CHLOR. THANE APHENE. TRI- 2.4-0, 2.4,5-T 2. 4-OP 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) JUN 05... <0.01 <0.1 <0.1 <1 <0.01 <0.01 <0.01 <0.01 <0.01 275 I 276 RIO LOCO BASIN 50129700 RIO LOCO AT GUANICA, PR WATER-QUALITY RECORDS LOCATION.--Lat 17'58'33', long 66'54'52', 0.6 ii (1.0 km) northwest of Guanica and 1.2 •i (1.9 ku) northeast of Ensenada. DRAINAGE AREA.--Indeterminate. PERIOD OF RECORD.--Water years 1975 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL. FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE 810- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1988 06... 1015 E200 293 8.00 24.5 17 7.3 87 15 410 9600 DEC 20... 0835 14000 7.70 24.5 7.4 9.0 106 150 3000 3300 FEB 1989 07... 1010 16000 7.70 24.5 9.0 5.9 69 140 3700 3700 APR 24... 1020 4000 7.90 28.0 3.5 6.7 84 40 370 210 JUN 07... 1145 9400 7.20 28.0 7.5 4.8 60 90 K1200 310 AUG 24... 1100 E100 437 7.60 28.0 19 5.0 64 41 K1100 3000 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SIUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE. TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1988 6... 1000 850 80 200 1500 21 52 110 <0.5 410 2700 DEC 20... 240 FEB 1989 7... 230 APR 24... 510 270 61 86 550 11 19 230 <0.5 180 1000 JUN 07... 200 AUG 24... 840 580 90 150 1200 18 41 160 -- 340 2100 SOLIDS. RESIDUE FLUO- SILICA. SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, OIS- CONSTI- DIS- AT 105 GEN, GEN. GEM, GEN. GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L OIS- (TC4S SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 6... 0.3 17 5100 15 1.19 0.01 1.20 0.03 0.37 DEC 20... 24 0.36 0.04 0.40 0.18 0.42 FEB 1989 7... 21 0.38 0.02 0.40 0.16 0.54 APR 24... 0.2 29 2070 13 0.48 0.02 0.50 0.06 0.54 JUN 07... 31 0.26 0.04 0.30 0.19 0.71 AUG 24... 0.3 27 4100 13 0.29 0.01 0.30 0.08 0.52 K non-ideal count E • estimate RIO LOCO BASIN 277 50129700 RIO LOCO AT GUANICA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (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 NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1988 6... 0.4 1.6 7.1 0.06 <1 <100 20 <1 30 30 DEC 20... 0.6 1.0 4.4 0.17 FEB 1989 7... 0.7 1.1 4.9 0.16 APR 24... 0.6 1.1 4.9 0.11 1 100 320 <1 4 20 JUN 07... 0.9 1.2 5.3 0.24 AUG 24... 0.6 0.9 4.0 0.09 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- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1988 6... 4900 12 170 0.9 <1 <1 20 <0.01 <1 0.04 DEC 20... FEB 1989 7... APR 24... 440 <5 140 0.1 <1 <1 <10 <0.01 2 0.31 JUN 07... AUG 24... PESTICIDE ANALYSES CHLOR- DI- DI- ENDO- PCB, ALDRIN, DANE, DDD, ODE, DDT, AZINON, ELDRIN SULFAN, DATE 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) JUN 07... 1145 <0.1 <0.01 <0.1 <0.01 <0.01 <0.01 0.03 <0.01 <0.01 HEPTA- METH- METHYL METHYL HEPTA- CHLOR MALA- OXY- PARA- TRI- ENDRIN, ETHION, CHLOR, EPDXIDE LINDANE THION, CHLOR, THION, THION, MIREX, DATE 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) JUN 07... <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 NAPH- THA- LENES, PARA- POLY- PER- TOX- TOTAL THION, CHLOR. THANE APHENE, TRI- 2,44, 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) JUN 07... <0.01 <0.1 <0.1 <1 <0.01 0.08 <0.01 <0.01 <0.01 278 THIS PAGE WAS LEFT BLANK INTENTIONALLY Rio Yogiiez basin Rio Grande de Alias., basin Marica MARICAO 80 HORMIGU R uRosario ar /Drainage boundary, _Island r•,;,..c'• divide "o= Guanoitho 133 • ABO ROJO • SAN GERMAN \s_Th gr, iDo P scso GRAN° Rro Loco basin Boquerdn canal Principal LAJ EXPLANATION A1380 SURFACE-WATER STATION AL AND NUMBER QUALITY-OF-WATER STATION ,12w I AND NUMBER • 143 WELL AN WELL NUMBER Coastal basin GUANICA SEA CARIBBEAN 0 5 KILOMETERS 3 4 S MILES Figure 24.--Rio Guanajibo basin. 280 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 Ali' (117.8 km2). PERIOD OF RECORD.--Water years 1979 to current year. WATER QUALITY DATA, WATER YEARS OCTOBER 1988 TO SEPTEMBER 1989 DIS- OXYGEN, OXYGEN COLI- STREP­ CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1988 06... 0810 100 475 7.90 24.5 4.5 6.3 75 <10 K15000 K1100 DEC 13... 1100 27 556 7.40 24.5 6.6 8.5 101 13 5800 260 FEB 1989 09... 1115 14 689 7.00 22.0 4.2 4.9 56 18 K7500 310 APR 06... 1135 E350 390 7.30 25.0 9.0 6.8 82 14 2400 K400 JUN 07... 1040 50 490 7.50 26.0 3.2 6.2 75 49 5600 K1600 AUG 29... 0900 78 323 7.80 24.0 19 7.6 90 21 K6600 56000 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SIUM, SODIUM, AD- SIUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1988 06... 240 18 24 44 13 0.4 1.6 220 <0.5 21 16 DEC 13... 220 FEB 1989 09... 240 APR 06... 190 15 19 34 10 0.3 1.4 160 <0.5 19 12 JUN 07... 140 AUG 29... 150 17 27 10 0.4 1.4 140 13 11 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 06... 0.1 33 286 77 39 0.54 0.06 0.60 0.14 0.26 DEC 13... 18 0.71 0.09 0.80 0.22 0.48 FEB 1989 09... 3 0.43 0.17 0.60 2.80 0.30 APR 6... 0.1 35 234 12 0.68 0.02 0.70 0.22 0.38 JUN 7... 5 0.69 0.11 0.80 0.29 0.51 AUG 29... 0.1 30 194 41 25 0.58 0.12 0.70 0.12 0.48 K = non-ideal count E = estimate RIO GUANAJIBO BASIN 50133600 RIO GUANAJIBO NEAR SAN GERMAN, PR--Continued WATER QUALITY DATA, WATER YEARS OCTOBER 1988 TO SEPTEMBER 1989 CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA t NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- NITRO- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (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 NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1988 06... 0.4 1.0 4.4 0.14 <1 <100 50 <1 24 <10 DEC 13... 0.7 1.5 6.6 0.04 FEB 1989 09... 3.1 3.7 16 1.10 APR 6... 0.6 1.3 5.8 0.13 <1 100 40 1 26 <10 JUN 7... 0.8 1.6 7.1 0.27 AUG 29... 0.6 1.3 3.9 0.20 METHY- IRON, LEAD, NESE. MERCURY SILVER, ZINC, MANGA- 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- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1988 06... 1800 <5 100 <0.1 <1 <1 <10 <0.01 4 0.03 DEC 13... FEB 1989 09... APR 6... 1600 <5 50 <0.1 <1 2 <10 <0.01 2 0.04 JUN 7... AUG 29... 281 282 RIO GUANAJIBO BASIN 50136400 RIO ROSARIO NEAR HORMIGUEROS, PR LOCATION.--Lat 18°09'36', long 67°05'08", at bridge on Highway 348, 0.5 mi (0.8 km) southwest of Rosario plaza. DRAINAGE AREA.--18.3 mil (47.4 km 2). 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. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 7,480 ft'is (212 ml/s), Aug.24, 1988, gage height, 13.64 ft (4.16 a) from rating curve extended above 900 ft'/s (25.5 m'/s) on basis of step-backwater analysis; minimum discharge 8.6 fti/s (0.244 m'/s), Mar. 11, 1989. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,500 ft.)/s (42.5 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (W/s) (0/s) (ft) (m) Date Time (W/s) (e/s) (ft) (m) Oct. 20 1700 1,620 45.9 7.90 2.407 Aug. 11 1530 1,640 46.4 7.93 2.417 Mar. 30 1630 *4,940 140 *12.00 3.668 Aug. 21 1730 2,970 84.1 9.84 2.999 Apr. 2 1700 2,260 64.0 8.89 2.710 Aug. 29 1345 3,100 87.8 10.00 3.048 June 1 unknown 3,740 106 unknown Sept. 2 1600 2,080 58.9 8.64 2.633 June 2 1730 1,840 52.1 8.26 2.518 Sept. 25 1830 2,660 75.3 9.44 2.877 July 23 1600 *4,920 139 *11.98 3.652 Minimum discharge, 8.6 ft'is (0.244 m'/s), Mar. 11. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 98 54 49 17 17 25 100 32 e488 38 57 87 2 73 47 48 17 18 20 346 51 e386 44 48 223 3 72 48 46 15 16 13 164 49 204 39 50 177 4 63 64 43 15 15 11 111 35 211 55 44 109 5 77 106 44 14 15 11 100 40 120 44 38 80 6 60 109 43 14 15 12 93 49 76 31 35 66 7 51 71 40 20 15 14 83 39 59 28 77 57 8 47 110 38 31 15 11 55 31 49 26 80 51 9 45 38 15 45 42 50 84 19 10 36 25 161 10 49 67 38 15 15 9.9 41 37 43 22 91 201 11 43 74 37 14 14 9.2 37 33 61 67 241 139 12 41 257 36 15 13 216 33 28 41 33 109 e250 13 38 140 35 14 13 86 33 28 35 22 60 e160 14 79 93 34 14 12 63 32 29 33 25 44 e175 15 64 250 32 13 99 17 30 28 32 23 39 e210 28 26 41 20 37 160 17 33 83 30 14 14 88 16 38 125 30 14 18 151 26 25 43 29 36 116 18 99 108 35 14 13 72 26 23 36 50 78 159 19 117 76 28 14 12 73 25 22 30 48 82 212 20 201 62 26 15 12 49 24 22 29 52 174 147 27 65 437 125 22 95 134 25 14 14 46 23 20 27 21 131 63 25 15 20 37 23 22 136 172 106 23 170 81 24 14 12 106 26 19 29 450 97 101 24 200 63 28 15 13 123 26 19 27 189 74 115 25 117 57 34 17 18 99 27 21 25 199 80 273 26 78 125 27 19 19 61 20 31 23 122 66 155 27 67 21 13 24 24 56 85 22 56 28 124 131 28 111 60 20 19 37 50 54 25 64 109 128 122 29 199 55 33 16 --- 155 46 41 39 82 343 106 30 114 52 21 16 431 29 36 27 65 145 122 31 70 --- 18 17 179 --- 58 --- 69 92 --- 2371 2331 3160 4296 MEAN 88.4 93.4 33.1 16.2 15.7 77.0 57.7 31.7 79.0 75.2 102 143 MAX 201 257 49 31 37 431 346 58 488 TOTAL 2740 2803 1026 502 440 2386.1 1730 983 450 437 273 MIN 33 47 18 13 12 9.2 20 19 23 20 35 51 AC-FT 5430 5560 2040 996 873 3430 1950 4700 4730 4620 6270 8520 CFSM 5.39 5.70 2.02 .99 .96 4.69 3.52 1.93 4.82 4.58 6.22 8.73 IN. 6.22 6.36 2.33 1.14 1.00 5.41 3.92 2.23 5.38 5.29 7.17 9.74 CAL YR 1988 TOTAL 18639.1 MEAN 50.9 MAX 998 MIN 9.1 AC-FT 36970 CFSM 3.11 IN. 42.28 WTR YR 1989 TOTAL 24768.1 MEAN 67.9 MAX 488 MIN 9.2 AC-FT 49130 CFSM 4.14 IN. 56.18 e Estimated 283 RIO GUANAJIBO BASIN 50136400 RIO ROSARIO NEAR HORMIGUEROS, PR--Continued 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 0-49 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, 2 mg/L several days. 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: Maximus daily mean, 1.040 mg/L March 30. 1989; Minimum daily mean, 2.0 mg/L several days. SEDIMENT WADS: Maximum daily. 5.350 tons (4.850 tonnes) July 23. 1989; Minimum daily 0.07 ton (0.06 tonne) January 15, 1989. WATER-QUALITY RATA. WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 01S- OXYGEN, OXYGEN COLA- STREP- CHARGE. SPE- DIS- DEMAND. FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL. CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1988 05... 0920 57 258 8.20 23.0 10 6.0 69 <10 K960 3900 DEC 12... 1110 37 262 7.80 21.5 0.9 8.8 99 <10 64 270 FEB 1989 08... 0845 14 292 7.30 21.0 1.0 8.4 94 11 190 420 APR 5... 0850 107 200 7.20 21.0 15 8.6 96 <10 2500 5000 JUN 6... 1025 77 245 7.60 24.0 5.2 8.0 93 19 470 710 AUG 02... 0810 49 260 8.10 23.0 2.1 7.4 86 14 K760 K1800 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SIUM. SODIUM, AD- SIUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- 01S- (MG/L TOT FLD SOLVED SOLVED SOLVED LION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1988 05... 110 7 20 15 6.5 0.3 1.5 110 <0.5 8.5 7.1 DEC 12... 120 FEB 1989 08... 130 APR 05... 95 4 15 14 4.8 0.2 1.2 85 <0.5 8.7 5.9 JUN 06... 110 AUG 02... 120 4 25 15 8.6 0.3 1.6 120 7.0 7.4 K • non-ideal count 284 RIO GUANAJIBO BASIN 50136400 RIO ROSARIO NEAR HORMIGUEROS, PR--Continued WATER QUALITY DATA, WATER YEARS OCTOBER 1988 TO SEPTEMBER 1989 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 05... 0.1 28 150 23 3 0.69 0.01 0.70 <0.01 0.19 DEC 12... 6 <0.01 0.70 <0.01 FEB 1989 08... 9 0.49 0.01 0.50 0.02 0.38 APR 5... 0.1 27 131 38 11 0.69 0.01 0.70 0.01 0.29 JUN 6... <1 <0.01 0.80 <0.01 AUG 02... 0.1 29 166 22 <1 <0.01 0.70 0.02 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (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 NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1988 05... 0.2 0.9 4.0 0.04 <1 100 <10 <1 8 <10 DEC 12... <0.2 0.05 FEB 1989 08... 0.4 0.9 4.0 0.04 APR 5... 0.3 1.0 4.4 0.03 <1 100 <10 <1 17 <10 JUN 6... <0.2 0.03 AUG 02... <0.2 0.05 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- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CH) (UG/L) (MG/L) OCT 1988 05... 890 <5 30 0.1 <1 1 40 <0.01 5 0.03 DEC 12... FEB 1989 08... APR 5... 1200 <5 30 0.2 <1 1 <10 <0.01 2 0.03 JUN 6... AUG 02... RIO GUANAJIBO BASIN 50136400 RIO ROSARIO NEAR HORMIGUEROS, PR--Continued WATER QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT SED. SED. SED. DIS- SEDI- SUSP. SUSP. SUSP. CHARGE, MENT, FALL FALL FALL INST. SEDI- DIS- DIAM. DIAM. DIAM. CUBIC MENT, CHARGE, PERCENT PERCENT PERCENT FEET SUS- SUS- FINER FINER FINER DATE TIME PER PENDED PENDED THAN THAN THAN SECOND (MG/L) (T/DAY) 002 MM .004 MM .008 MM MAR 1989 12... 0800 439 586 695 54 76 JUN 01... 1800 3730 5620 56600 8 13 20 11... 1500 67 1230 223 2 4 6 AUG 21... 1800 2510 6360 43102 10 19 26 SEP 02... 1605 2030 4280 23459 14 21 32 SED. SED. SED. SED. SED. SED. SED. SUSP. SUSP. SUSP. SUSP. SUSP. SUSP. SUSP. FALL FALL SIEVE SIEVE SIEVE SIEVE SIEVE DIAM. DIAM. DIAM. DIAM. DIAM. DIAM. DIAM. PERCENT PERCENT PERCENT PERCENT PERCENT PERCENT PERCENT FINER FINER FINER FINER FINER FINER FINER DATE THAN THAN THAN THAN THAN THAN THAN .016 MM 031 MM .062 MM .125 MM .250 MM .500 MM 1.00 MM MAR 1989 12... 89 97 99 100 100 JUN 1... 34 48 54 78 90 97 99 11... 8 10 12 15 23 44 71 AUG 21... 33 41 48 66 86 95 SEP 2... 45 61 68 98 99 285 286 RIO GUANAJIBO BASIN 50136400 RIO ROSARIO NEAR HORMIGUEROS, 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) OCTOBER NOVEMBER DECEMBER 1 98 62 23 54 15 2.2 49 15 2.0 2 73 8 1.6 47 15 1.9 48 14 1.8 3 72 36 8.8 48 15 1.9 46 11 1.4 4 63 10 1.7 64 20 3.5 43 10 1.2 5 77 55 22 106 149 147 44 10 1.2 6 60 25 4.1 109 80 24 43 10 1.2 7 51 15 2.1 71 50 9 6 40 8 .86 8 47 5 .63 110 201 323 38 7 .72 9 45 5 .61 84 60 14 38 7 .72 10 49 10 1.3 67 40 7.2 38 6 .62 11 43 5 .58 74 65 13 37 6 .60 12 41 5 .55 257 736 1610 36 5 .49 13 38 5 .51 140 150 57 35 5 .47 14 79 216 159 93 70 18 34 5 .46 15 64 20 3.5 250 717 1360 32 5 .43 16 38 7 .72 125 250 84 30 5 .41 17 33 6 .53 8.3 50 11 30 5 .41 18 99 486 600 108 223 171 35 6 .57 19 117 274 251 76 40 8.2 28 5 .38 20 201 817 1760 62 20 3.3 26 5 .35 21 131 127 52 63 20 3.4 25 5 .34 22 95 65 20 134 196 453 25 5 .34 23 170 403 804 81 40 8.7 24 5 .32 24 200 363 488 63 20 3.4 28 5 .38 25 117 70 22 57 16 2.5 34 10 .92 26 78 40 8.4 125 235 333 27 6 .44 27 67 35 6.3 85 25 5.7 21 5 .28 28 111 172 219 60 17 2.8 20 5 .27 29 199 440 672 55 17 2.5 33 20 7.4 30 114 60 18 52 16 2.2 21 4 .23 31 70 40 7.6 --- --- --- 18 3 .15 TOTAL 2740 4666.53 2803 4607.0 1026 27.36 RIO GUANAJIBO BASIN 287 50136400 RIO ROSARIO NEAR HORMIGUEROS, 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) JANUARY FEBRUARY MARCH 1 17 4 .18 17 8 .37 25 8 .54 2 17 4 .18 18 9 .44 20 5 .27 3 15 4 .16 16 9 .39 13 5 .15 4 15 4 .16 15 9 .36 11 6 .18 5 14 5 .19 15 9 .36 11 6 .18 6 14 5 .19 15 9 .36 12 6 .24 7 20 6 .32 15 8 .32 14 6 .23 8 31 10 .84 15 8 .32 11 5 .15 9 19 3 .15 15 8 .32 10 5 .14 10 15 2 .08 15 9 .36 9.9 5 .14 11 14 2 .08 14 8 .30 9.2 5 .12 12 15 2 .08 13 7 .25 216 298 217 13 14 2 .08 13 7 .25 86 60 14 14 14 2 .08 12 8 .26 63 40 6.8 15 13 2 .07 17 8 .37 99 86 37 16 14 2 .08 18 8 .39 151 167 83 17 14 2 .08 14 9 .34 88 60 14 18 14 2 .08 13 10 .35 72 70 14 19 14 2 .08 12 10 .32 73 50 9.9 20 15 2 .08 12 10 .32 49 30 4.0 21 15 2 .08 20 12 .65 37 25 2.5 22 14 2 .08 14 7 .26 46 25 3.1 23 14 2 .08 12 7 .23 106 97 43 24 15 2 .08 13 6 .21 123 139 91 25 17 2 .09 18 15 .73 99 90 24 26 19 3 .15 19 15 .77 61 25 4.1 27 22 3 .18 13 9 .32 56 20 3.0 28 19 2 .10 37 10 1.0 50 20 2.7 29 16 2 .09 --- --- --- 155 339 549 30 16 2 .09 431 1040 5000 31 17 5 .23 179 259 169 TOTAL 502 4.49 440 10.92 2386.1 6378.44 288 RIO GUANAJIBO BASIN 50136400 RIO ROSARIO NEAR HORMIGUEROS, 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 1 100 90 24 32 10 .86 488 741 4630 2 346 866 3120 51 36 17 386 770 1850 3 164 139 89 49 25 3.3 204 338 244 4 111 87 48 35 15 1.4 211 474 891 5 100 30 10 40 8 .86 120 103 36 6 93 71 52 49 7 .93 76 15 3.1 7 83 50 11 39 6 .63 59 10 1.6 8 55 5 .74 31 10 .84 49 12 1.6 9 45 5 .61 36 15 1.5 42 11 1.2 10 41 4 .44 37 10 1.1 43 16 1.9 11 37 3 .30 33 8 .80 61 16 2.6 12 33 3 .27 28 8 .71 41 13 1.4 13 33 3 .27 28 7 .43 35 12 1.1 14 32 3 .26 29 7 .60 33 12 1.1 15 30 2 .16 28 7 .57 32 11 .95 16 28 2 .15 26 8 .56 41 12 1.3 17 26 2 .14 25 8 .54 43 9 1.0 18 26 2 .14 23 7 .43 36 7 .68 19 25 2 .14 22 8 .48 30 6 .49 20 24 2 .13 22 8 .48 29 4 .31 21 23 2 .12 22 9 .53 27 3 .22 22 23 2 .12 20 10 .54 27 4 .29 23 26 3 .21 19 9 .46 29 4 .31 24 26 2 .14 19 8 .41 27 2 .15 25 27 3 .22 21 9 .51 25 2 .14 26 20 2 .11 31 10 .84 23 2 .12 27 24 2 .13 28 10 .76 24 2 .13 28 54 45 27 25 8 .54 64 73 42 29 46 3 .37 41 10 1.1 39 25 2.6 30 29 3 .23 36 4 .39 27 17 1.2 31 --- --- --- 58 52 22 --- --- --- TOTAL 1730 3386.40 983 62.10 2371 7718.49 RIO GUANAJIBO BASIN 50136400 RIO ROSARIO NEAR HORMIGUEROS, 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) JULY AUGUST SEPTEMBER 1 38 25 2.6 57 12 1.8 87 40 13 2 44 25 3.0 48 5 .65 223 632 2340 3 39 25 2.6 50 5 .68 177 327 391 4 55 50 7.4 44 4 .48 109 30 8.8 5 44 13 1.5 38 4 .41 80 8 1.7 6 31 8 .67 35 4 .38 66 5 .89 7 28 7 .53 77 117 113 57 7 1.1 8 26 7 .49 80 55 12 51 5 .69 9 25 7 .47 50 20 2.7 161 383 839 10 22 7 .42 91 147 122 201 403 797 11 67 67 37 241 532 1450 139 138 57 12 33 12 1.1 109 70 21 e250 e370 e250 13 22 6 .36 60 25 4.1 el60 el60 e69 14 25 20 1.4 44 15 1.8 e175 el90 e90 15 23 10 .62 39 10 1.1 e210 e389 e577 16 20 5 .27 37 10 1.0 160 160 69 17 29 5 .39 36 10 .97 116 90 28 18 50 5 .68 78 98 71 159 257 204 19 48 5 .65 82 60 13 212 298 196 20 52 5 .70 174 255 204 147 150 60 21 65 33 8 7 437 947 3460 125 100 34 22 136 312 574 172 156 98 106 70 20 23 450 982 4850 97 20 5.2 101 90 25 24 189 287 200 74 10 2.0 115 100 31 25 199 601 1040 80 8 1.7 273 584 1770 26 122 110 42 66 8 1.4 155 196 105 27 124 166 155 56 8 1.2 131 132 58 28 109 70 21 128 360 387 122 100 33 29 82 25 5.5 343 765 3310 106 75 21 30 65 20 3.5 145 155 99 122 131 77 31 69 20 3.7 92 20 5.0 --- --- --- TOTAL 2331 7668.25 3160 9392.57 4296 8167.18 YEAR 24768.1 52089.73 e - Estimate 289 I I I RIO GUANAJIBO BASIN 290 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 Hormigueros, and 2.0 i (3.2 km) downstream fro Rio Rosario. DRAINAGE AREA.--120 i 2 (311 km 2 ). 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.--16 years (1974-89), 216 ft'is (6.117 40/s), 24.44 in/yr (621 mm/yr), 156,500 acre-ft/yr (193 Nei/yr); median of yearly mean discharges, 204 ft'/s (5.78 m'/s), 148,000 acre-ft/yr (182 hm'/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 128,000 ft'/s (3,620 m 3/5), Sept. 16, 1975, gage height, 28.50 ft (8.687 m), site and datum then in use, from rating curve extended above 100 ft'/s (2.832 m'/s) on the basis of contracted-opening measurement of peak flow; minimum discharge, 4.6 ft'is (0.130 m'/s), June 22, 1977. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 2,000 ft'is (56.6 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (W/s) (m'/s) (ft) (m) Date Time (W/s) (43/s) (ft) (m) Apr. 3 0300 *2,370 67.1 *19.46 5.931 Sept. 11 0200 2,050 58.1 18.71 5.703 Aug. 11 2200 2,080 59.0 18.79 5.727 Sept. 27 2115 2,220 62.9 19.11 5.825 Aug. 22 0130 2,010 56.9 18.63 5.678 Minimum discharge, 9.9 ft'/s (0.280 m'/s), July 1. DISCHARGE, CUBIC FEET PER SECOND. WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 439 300 128 76 36 23 775 88 365 12 139 543 2 334 247 125 71 e40 27 949 91 1110 170 125 866 3 320 289 119 69 e37 15 1550 134 835 61 123 999 4 279 362 114 66 e35 15 760 134 419 40 122 460 5 260 316 111 63 e35 19 883 150 261 50 113 340 6 260 478 107 62 e33 21 549 145 190 89 107 282 7 207 277 102 64 e33 22 437 112 150 49 116 253 8 179 320 98 160 e32 19 321 92 122 39 171 239 9 165 253 93 118 e32 17 270 87 127 35 122 624 10 154 217 92 78 32 16 241 98 115 80 187 974 200 756 1120 12 138 724 87 76 32 308 201 78 105 el40 615 588 13 143 862 85 76 30 161 188 76 93 e120 221 684 14 341 371 83 59 28 155 179 71 85 e110 175 486 15 421 622 83 54 28 323 11 148 285 91 68 32 16 219 85 115 167 66 78 101 162 639 16 198 399 81 53 41 569 155 62 101 88 150 859 17 158 225 79 52 37 211 145 58 109 85 263 357 18 194 221 87 52 39 152 135 55 97 84 433 379 19 215 e210 81 51 33 135 128 53 75 76 375 840 20 348 e200 79 49 25 218 120 64 72 391 54 1460 21 288 e190 76 46 29 209 111 51 55 69 786 861 22 193 e200 90 42 26 134 106 48 33 154 950 636 23 265 e190 119 40 23 273 99 46 27 423 315 473 24 624 175 100 41 21 325 112 46 22 661 256 565 25 567 162 90 46 26 125 56 17 286 324 239 638 26 380 221 94 85 24 205 101 95 14 208 224 1270 27 420 231 86 74 21 225 105 70 13 173 202 1440 28 466 151 74 55 33 489 116 53 23 201 569 1150 29 746 140 104 41 --- 898 133 53 48 147 742 802 30 845 132 88 39 868 98 73 13 140 531 634 31 469 --- 79 35 1200 --- 76 145 403 --- 1961 873 7554 9478 2456 4881 4346 10083 21461 MEAN 328 299 94.4 63.3 31.2 244 316 79.2 163 140 325 715 MAX 845 862 128 160 41 1200 1550 150 1110 661 950 1460 MIN 138 132 74 35 21 15 98 13 12 107 TOTAL 10164 8970 2925 46 239 AC-FT 20160 17790 5800 3890 1730 14980 18800 9680 8620 42570 4870 20000 CFSM 2.73 2.49 .79 .53 .26 2.63 .66 1.36 2.71 5.96 2.03 1.17 IN. 3.15 2.78 .91 .61 .27 2.34 2.94 .76 1.51 1.35 3.13 6.65 CAL YR 1988 TOTAL 71854 MEAN 196 MAX 12900 MIN 12 AC-FT 142500 CFSM 1.64 IN. 22.27 WTR YR 1989 TOTAL 85152 MEAN 233 MAX 1550 MIN 12 AC-FT 168900 CFSM 1.94 IN. 26.40 e 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 1988 TO SEPTEMBER 1989 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1988 5... 1345 237 402 7.80 26.5 15 5.4 67 <10 3800 290 DEC 13... 0850 85 437 7.10 23.0 20 9.6 111 <10 320 K1700 FEB 1989 09... 0915 33 476 7.20 21.5 3.5 7.5 84 11 K170 310 APR 6... 0940 558 326 6.80 22.5 33 8.7 100 14 4700 8600 JUN 7... 0835 167 396 7.30 25.5 12 6.3 75 27 K9200 2300 AUG 25... 0810 231 358 7.50 26.0 8.5 7.4 90 20 K800 3300 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SIUM, SODIUM, AD- SIUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLO SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1988 5... 180 24 27 28 12 0.4 1.8 190 <0.05 17 13 DEC 13... 180 FEB 1989 09... 190 APR 6... 160 14 21 25 8.2 0.3 2.0 130 1.6 16 10 JUN 7... 170 AUG 25... 200 4 31 30 16 0.5 2.1 150 18 17 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 5... 0.2 32 230 147 11 0.67 0.03 0.70 0.05 0.35 DEC 13... 43 0.79 0.01 0.80 0.03 0.47 FEB 1989 09... 35 0.97 0.03 1.00 0.06 0.54 APR 6... 0.1 29 196 295 50 0.57 0.03 0.60 0.05 0.35 JUN 7... 13 0.49 0.01 0.50 0.01 0.19 AUG 25... 0.2 33 270 168 12 0.63 0.07 0.70 0.41 0.09 K = non-ideal count 291 292 RIO GUANAJIBO BASIN 50138000 RIO GUANAJIBO NEAR HORMIGUEROS, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (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 NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1988 5... 0.4 1.1 4.9 0.17 <1 <100 20 1 22 10 DEC 13... 0.5 1.3 5.8 0.22 FEB 1989 09... 0.6 1.6 7.1 0.28 APR 6... 0.4 1.0 4.4 0.18 <1 100 30 1 42 10 JUN 7... 0.2 0.7 3.1 0.04 AUG 25... 0.5 1.2 5.3 0.46 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- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1988 5... 1600 <5 120 0.1 <1 <1 10 <0.01 <1 0.04 DEC 13... FEB 1989 09... APR 6... 4800 <5 160 0.1 <1 1 10 <0.01 2 0.03 JUN 7... AUG 25... PESTICIDE ANALYSES CHLOR- DI- DI- ENDO- PCB, ALDRIN, DANE, DOD, DDE, DDT, AZINON, ELDRIN SULFAN, DATE 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) JUN 07... 0835 <0.1 <0.01 <0.1 <0.01 <0.01 <0.01 0.01 <0.01 <0.01 HEPTA- METH- METHYL METHYL HEPTA- CHLOR MALA- OXY- PARA- TRI- ENDRIN, ETHION, CHLOR, EPDXIDE LINDANE THION, CHLOR, THION, THION. MIREX, DATE 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) JUN 07... <0.01 <0.01 <0.01 <0.01 <0.01 0.01 <0.01 <0.01 <0.01 <0.01 NAPH- THA- LENES, PARA- POLY- PER- TOX- TOTAL THION, CHLOR. THANE APHENE, TRI- 2,4-0, 2,4,5-T 2, 4-OP 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) JUN 07... <0.01 <0.1 <0.1 <1 <0.01 0.07 <0.01 <0.01 <0.01 Coastal basi Drainage boundary Rio Cuiebrinat bow, LARES • Rro Grand Guajotaca basin Pa Comuy basin Rio Tanorna' basin Lino BAHIA DE MAYAGUEZ 1 Coastal basin ,•4(o Guanajibo basin MARICAO I Drainage boundary ( ) , 42 "(tattoo basin Guayanil basin \j1land divide EXPLANATION Ai440 SURFACE-WATER STATION AND NUMBER 71388 QUALITY-OF-WATER STATION AND NUMBER 11 1415 LAKE-ELEVATOR STATION Mop area 4 I 5 KILOMETERS 3 ES Figure 25.--Rio Yaguez and Rio Grande de Anasco basins. 294 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 Mayaguez plaza. DRAINAGE AREA.--6.7 mil (17.3 km 2 ). PERIOD OF RECORD.--Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 DIS- OXYGEN, OXYGEN COLT- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1988 4... 1225 15 280 8.10 25.0 12 5.7 68 12 K1100 2000 DEC 12... 1315 8.3 313 7.60 22.0 0.6 5.8 67 <10 K160 550 FEB 1989 08... 1105 2.4 318 7.30 22.0 1.2 9.7 110 <10 430 1000 APR 5... 1145 14 255 7.20 23.0 4.8 7.3 84 <10 2500 4900 JUN 6... 0735 17 234 7.20 23.0 5.0 8.9 102 18 K750 7500 AUG 02... 1155 17 280 7.80 25.0 19 8.7 104 14 3400 4100 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SIUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1988 4... 120 5 22 6.9 5.6 0.4 2.0 120 <0.5 7.7 7.3 DEC 12... 140 -- FEB 1989 08... 140 APR 5... 110 0 28 9.0 9.4 0.4 2.4 100 1.6 8.6 8.1 JUN 6... -- 100 AUG 02... 110 0 30 9.6 9.7 0.4 2.3 110 7.0 8.6 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 4... 0.1 29 160 6.4 2 0.39 0.01 0.40 0.01 0.19 DEC 12... 6 0.89 0.01 0.90 0.01 0.39 FEB 1989 08... 2 0.49 0.01 0.50 0.02 0.28 APR 5... 0.1 27 157 5.7 1 <0.01 1.00 0.01 JUN 6... 1 0.62 0.08 0.70 0.39 0.41 AUG 02... 0.1 29 166 7.7 6 0.79 0.01 0.80 0.01 0.59 K = non-ideal count 295 RIO YAGUEZ BASIN 50138800 RIO YAGUEZ NEAR MAYAGUEZ, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (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 NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1988 04... 0.2 0.6 2.7 0.03 <1 <100 <10 <1 3 <10 DEC 12... 0.4 1.3 5.8 0.05 FEB 1989 08... 0.3 0.8 3.5 0.04 APR 05... <0.2 0.03 <1 200 20 <1 1 <10 JUN 06... 0.8 1.5 6.6 0.04 AUG 02... 0.6 1.4 6.2 0.06 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- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1988 04... 380 <1 20 0.1 <1 <1 <10 <0.01 2 0.03 DEC 12... FEB 1989 08... APR 05... 290 10 10 0.1 <1 2 <10 <0.01 1 0.04 JUN 06... AUG 02... I 296 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 mil (24.86 ke). ELEVATION RECORDS PERIOD OF RECORD.--April 1980 to January 1985, June to September 1989. GAGE.--Water-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 hm') for power and irrigation. The dam is a concrete gravity structure with a total length of 555 ft (169.2 m), a maximum structural height of 190 ft (57.9 m), and a maximum width at the base of 145 ft (44.2 m). The ungated overflow spillway with a crest elevation of 60.00 ft (18.288 m) and a crest length of 220 ft (67.1 m) was designed to pass a maximum flood of 30,200 ft'is (855 m"/s) at a reservoir elevation of 70.00 ft (21.336 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 (445.749 m), May 27, 1980; minimum elevation, 1428.62 ft (435.443 m), May 2, 1984. EXTREMES OBSERVED FOR CURRENT PERIOD.--Maximum elevation, 1461.26 ft (445.392 m), Sept. 18,19; minimum elevation, 1432.41 ft (436.598 m), July 21. Capacity Table (based on data fro Puerto Rico Water Resources Authority) Elevation, in feet Contents, in acre-feet Elevation, in feet Contents, in acre-feet 1430 6,530 1460 13,550 1449 10,660 1465 15,000 ELEVATION (FEET NGVD), WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 OBSERVATION AT 24:00 VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 1446.42 1442.22 1447.65 2 1445.31 1441.19 1450.45 3 1445.79 1441.26 1451.64 4 A 1439.91 1451.91 5 A 1438.41 1450.67 6 A 1438.75 1449.53 7 A 1437.91 1448.39 8 A 1436.85 1447.35 9 1454.68 1447.18 1435.18 1448.12 10 1455.10 1446.91 1434.32 1452.11 11 1455.52 1446.46 1434.04 1454.11 12 1455.78 1445.66 1434.12 1454.27 13 1455.62 1443.92 1434.20 1454.56 14 1455.36 1441.96 1433.93 1455.47 15 1454.86 1440.67 1432.89 1457.00 16 1454.97 1438.05 A 1458.46 17 1454.72 1436.22 A 1459.35 18 1454.67 1434.82 A 1461.26 19 1454.26 1434.82 A 1461.19 20 1454.58 1434.07 A 1460.99 21 1454.43 A 1444.10 1460.72 22 1453.51 A 1447.88 1460.38 23 1452.61 A 1447.63 1460.80 24 1451.58 A 1446.66 1460.60 25 1450.96 A 1445.81 1460.19 26 1449.83 A 1445.07 1460.21 27 1449.44 1439.20 1444.13 1460.76 28 1449.32 1440.24 1443.96 1460.05 29 1448.53 1441.04 1445.30 1459.81 30 1447.56 1441.56 1445.43 1460.67 31 --- 1442.27 1444.35 MEAN --- 1455.96 MAX --- 1461.26 MIN --- 1447.35 A No gage-height record. RIO GRANDE DE ANASCO BASIN 297 50143000 RIO GRANDE DE 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' (68.1 km2 ) this does not include 36.2 mi' (93.8 km') which contributes only dur- ing high floods, and 3.5 mi' (9.1 km2) which contributes only part of its storm runoff. PERIOD OF RECORD.--Water years 1959-68. 1970 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITV SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1988 06... 0740 85 235 8.00 21.0 57 8.3 94 <10 25000 73000 DEC 15... 0950 29 316 8.30 22.0 1.8 8.7 99 <10 K100 K140 FEB 1989 09... 1040 14 322 8.40 23.0 1.4 9.4 109 <10 K10 K10 APR 11... 1230 18 300 8.60 25.0 3.4 9.7 118 <10 30 40 JUN 5... 1530 142 235 7.50 26.0 23 7.6 94 61 K700 580 AUG 22... 1730 147 195 7.80 25.0 88 7.9 96 13 3500 8100 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SLUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1988 6... 110 15 29 8.1 10 0.4 1.9 94 <0.5 18 9.3 DEC 15... 120 FEB 1989 09... 120 APR 11... 130 8 35 10 13 0.5 1.6 120 <0.5 20 10 JUN 05... 80 AUG 22... 81 22 6.3 7.8 0.4 2.2 66 12 9.9 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 06... 0.1 27 158 36 83 1.58 0.02 1.60 0.06 0.34 DEC 15... 5 1.19 0.01 1.20 0.01 0.29 FEB 1989 09... 2 0.59 0.01 0.60 0.01 0.19 APR 11... 0.1 30 192 9.4 8 0.69 0.01 0.70 0.02 0.38 JUN 05... 33 1.12 0.38 1.50 1.10 1.00 AUG 22... 0.1 26 129 51 98 1.57 0.03 1.60 0.05 0.45 K non-ideal count RIO GRANDE DE ANASCO BASIN 298 50143000 RIO GRANDE DE ANASCO NEAR LARES, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (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 NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1988 06... 0.4 2.0 8.9 0.09 <1 <100 110 <1 5 10 DEC 15... 0.3 1.5 6.6 0.04 FEB 1989 09... 0.2 0.8 1.8 0.04 APR 11... 0.4 1.1 4.9 0.03 <1 100 90 1 2 <10 JUN Os... 2.1 3.6 9.7 0.34 AUG 22... 0.5 2.1 6.3 0.06 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- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) MANGA- OCT 1988 06... 3300 <5 80 0.3 <1 <1 10 <0.01 <1 0.04 DEC 15... FEB 1989 09... APR 11... 180 <5 40 <0.1 <1 <1 20 <0.01 2 0.03 JUN 05... AUG 22... RIO GRANDE DE ANASCO BASIN 299 50144000 RIO GRANDE DE ANASCO NEAR SAN SEBASTIAN, PR LOCATION.--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 mil (244.2 km 2 ), does not include 36.2 mi 2 (93.8 km') which contributes only during high floods, and 3.5 mi 2 (9.1 km') which contributes only part of Stu 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, a 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 hml. Limited storm runoff is contributed to basin by 3.5 00 2 (9.1 km 2 ) above Rio Toro Diversion dam. Gage-height and precipitation satellite telemetry at station. AVERAGE DISCHARGE.--26 years (1964-89), 311 ftl/s (8.808 m'/s), 44.79 in/yr (1,138 mm/yr), 225,320 acre-ft/yr (278 hm'/yr); median of yearly mean discharges, 304 ft'is (8.61 m'/s), 220,000 acre-ft/yr (271 hm 3/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 140,000 ft'is (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 m'/s) on basis of slope-area measurement; minimum discharge, 31 ft'is (0.878 m'/s), Apr. 19, 20, 1965. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 6,000 ft'is (170 10/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (W/s) (10/s) (ft) (m) Date Time (fti/s) (m 3/s) (ft) (m) Oct. 20 1700 *15,600 442 *11.61 3.539 Sept. 10 1900 6,340 180 7.46 2.274 June 1 2115 9,110 258 8.91 2.716 Sept. 15 2045 6.100 173 7.32 2.231 Aug. 21 2030 13,200 374 10.69 3.258 Sept. 21 1815 7,130 202 7.90 2.408 Minimum discharge, 61 ft'is (1.728 m'/s), Mar. 11, 12. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 503 390 225 142 116 260 473 165 1280 206 833 748 2 419 359 220 139 100 244 384 182 1010 el300 368 710 3 395 390 217 136 97 94 395 298 561 e760 222 567 4 392 382 213 135 96 71 227 181 507 e300 235 431 5 640 599 215 136 94 66 205 158 433 e580 188 381 6 273 842 204 132 93 64 244 130 293 e370 169 360 7 e220 511 196 132 91 70 233 125 254 e280 621 343 8 e1300 429 194 146 88 72 167 219 220 225 417 333 9 e415 403 191 136 89 67 145 385 195 213 242 627 10 e330 365 188 127 88 64 129 302 183 205 474 1490 11 e230 347 185 121 88 62 124 258 200 502 823 915 12 e210 990 183 121 84 283 119 157 175 320 504 788 13 208 675 180 119 82 263 113 202 163 373 310 721 14 292 783 176 115 79 135 126 161 155 329 377 620 15 400 433 173 112 95 158 110 119 150 295 262 1290 16 618 425 171 109 132 204 105 110 288 230 356 1100 17 333 361 169 109 96 124 100 99 278 282 275 608 18 331 329 179 109 87 139 97 93 217 363 783 978 19 915 320 166 108 79 246 93 86 387 239 499 2160 20 2430 307 160 108 83 320 90 88 237 255 381 1510 21 1090 293 156 112 91 289 90 87 186 253 1720 2060 22 699 360 156 109 77 206 88 86 185 313 1210 1100 23 486 364 154 106 70 260 133 76 200 257 792 656 24 409 299 158 109 69 288 153 75 175 304 376 1090 25 368 283 198 102 78 247 109 83 145 422 729 1180 26 362 277 189 143 157 171 76 252 151 317 604 643 27 461 270 152 139 106 139 231 201 398 755 409 1450 28 945 258 147 124 102 182 272 100 453 470 323 852 29 681 245 145 110 --- 406 468 172 375 283 546 551 30 533 230 149 101 529 253 244 207 306 401 1610 31 444 --- 143 98 576 --- 307 --- 276 322 --- TOTAL 17332 12519 5552 3745 2607 6299 5552 5201 9661 11583 15771 27872 MEAN 559 417 179 121 93.1 203 185 168 322 374 509 929 MAX 2430 990 225 146 157 576 473 385 1280 1300 1720 2160 MIN 208 230 143 98 69 62 76 75 145 205 169 333 AC-FT 34380 24830 11010 7430 5170 12490 11010 10320 19160 22970 31280 55280 CFSM 5.93 4.43 1.90 1.28 .99 2.15 1.96 1.78 3.41 3.96 5.39 9.85 IN. 6.84 4.94 2.19 1.48 1.03 2.48 2.19 2.05 3.81 4.57 6.22 11.00 CAL YR 1988 TOTAL 112056 MEAN 306 MAX 5780 MIN 58 AC-FT 222300 CFSM 3.25 IN. 44.20 WTR YR 1989 TOTAL 123694 MEAN 339 MAX 2430 MIN 62 AC-FT 245300 CFSM 3.59 IN. 48.80 e Estimated 300 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 1988 TO SEPTEMBER 1989 DIS- OXYGEN, COLI- STREP- CHARGE, SPE- DIS- FORM, TOCOCCI HARD- INST. CIFIC SOLVED FECAL, FECAL, NESS CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- 0.7 KF AGAR TOTAL FEET DUCT- (STAND- ATURE BID- DIS- CENT UM-MF (COLS. (MG/L DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- (COLS./ PER AS SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) 100 ML) 100 ML) CAC03) OCT 1988 05... 0930 519 208 7.40 25.5 4.1 7.8 95 20000 8600 100 JAN 1989 10... 1120 390 241 8.00 23.0 2.4 8.6 100 2300 450 110 APR 13... 0800 112 252 8.10 22.0 5.6 7.8 87 K100 200 110 JUL 19... 1230 226 242 7.90 24.5 17 8.4 100 K82 340 97 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- FLUO- SILICA, NONCARB CALCIUM SIUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, RIDE, DIS- WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET DIS- DIS- DIS- SOLVED TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD SOLVED SOLVED SOLVED (MG/L DATE MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L AS CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS SO4) AS CL) AS F) SI02) OCT 1988 05... 5 26 9.5 9.2 0.4 1.7 85 10 7.2 0.1 31 JAN 1989 10... 6 29 10 10 0.4 1.6 97 11 7.4 0.1 32 APR 13... 4 28 10 9.2 0.4 1.6 110 10 7.0 0.1 30 JUL 19... 1 25 8.4 8.8 0.4 1.8 93 10 6.6 0.1 30 SOLIDS, SOLIDS, NITRO- NITRO- NITRO- NITRO- PHOS- PHOS- RESIDUE SUM OF SOLIDS, GEN, GEN, GEN, GEN,AM- PHOS- PHOROUS PRATE, AT 180 CONSTI- DIS- NO2+NO3 AMMONIA AMMONIA MONIA + PHOS- PHOROUS ORTHO, ORTHO, DEG. C TUENTS, SOLVED DIS- DIS- DIS- ORGANIC PHOROUS DIS- DIS- DIS- DIS- DIS- (TONS SOLVED SOLVED SOLVED TOTAL TOTAL SOLVED SOLVED SOLVED DATE SOLVED SOLVED PER (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L) (MG/L) DAY) AS N) AS N) AS NH4) AS N) AS P) AS P) AS P) AS PO4) OCT 1988 05... 159 159 222 1.10 <0.01 0.5 0.04 0.04 0.05 0.15 JAN 1989 10... 160 169 178 0.71 0.03 0.04 0.4 0.05 0.04 0.03 0.09 APR 13... 158 163 49 0.64 0.01 0.01 <0.2 0.03 0.03 0.03 0.09 JUL 19... 146 153 93 0.93 0.03 0.04 0.2 0.05 0.05 0.03 0.09 ALUM- BERYL- CHRO- INUM, ARSENIC BARIUM, LIUM, CADMIUM MIUM, COBALT, COPPER, IRON, LEAD, 01S- DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS AL) AS AS) AS BA) AS BE) AS CO) AS CR) AS CO) AS CU) AS FE) AS PB) OCT 1988 05... 60 <1 39 <0.5 <1 1 <3 4 31 <5 JAN 1989 10... 10 <1 39 <0.5 1 1 <3 2 16 <5 APR 13... 20 <1 40 <0.5 <1 <1 <3 <1 14 7 JUL 19... 30 <1 38 <0.5 <1 <1 <3 1 20 2 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 1988 TO SEPTEMBER 1989 MANGA- MOLYB- SELE- STRON- VANA- LITHIUM NESE, MERCURY DENUM, NICKEL, NIUM, SILVER, TIUM, DIUM, ZINC, DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS LI) AS MN) AS HG) AS MO) AS NI) AS SE) AS AG) AS SR) AS V) AS ZN) OCT 1988 05... <4 10 <0.1 <10 <1 <1 1.0 130 <6 4 JAN 1989 10... <4 14 <0.1 <10 1 <1 <1.0 140 <6 6 APR 13... <4 14 <0.1 <10 1 <1 1.0 140 6 <3 JUL 19... <4 28 <0.1 <10 1 <1 <1.0 130 <6 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 TIME TANEOUS PENDED PENDED THAN (CFS) (MG/L) (T/DAY) .062 MM OCT 1988 05... 0920 519 36 50 62 JAN 1988 10... 1110 390 8 8 66 APR 13... 0740 112 42 13 88 JUL 19... 1230 226 361 220 87 301 I 302 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 fro Anasco plaza. DRAINAGE AREA.--139 mil (360 km 2 ) this does not include 39.7 mil (102.8 km 2 ), flow is diverted to south coast. PERIOD OF RECORD.--Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 DIS- OXYGEN, OXYGEN COLI- STREP­ CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1988 04... 1540 580 235 7.50 25.0 58 7.8 94 <10 730 970 DEC 14... 1235 218 243 7.90 24.0 35 7.9 93 <10 300 K90 FEB 1989 08... 1140 11 260 7.70 23.0 2.8 8.2 94 <10 70 50 APR 12... 1415 144 232 7.90 24.5 56 7.8 92 15 54 K230 JUN 08... 0930 297 255 7.60 24.0 22 8.0 93 29 250 450 AUG 23... 1130 350 200 7.60 25.0 46 8.6 103 <10 K1600 3800 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SIUM, SODIUM, AD- SIUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- D1S- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1988 04... 80 0 19 7.8 7.6 0.4 1.7 94 <0.5 9.3 6.0 DEC 14... 110 FEB 1989 08... 110 APR 12... 110 2 27 9.9 9.2 0.4 1.7 100 <0.5 9.2 7.0 JUN 08... 100 AUG 23... 98 0 25 8.6 10 0.5 2.0 80 8.2 7.0 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- 01S- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENOED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SIO2) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 04... 0.1 32 130 204 69 0.99 0.01 1.00 0.03 0.27 DEC 14... 82 0.69 0.01 0.70 0.04 0.26 FEB 1989 08... 9 0.29 0.01 0.30 0.02 0.18 APR 12... 0.1 28 156 61 <1 0.48 0.02 0.50 0.08 1.20 JUN 08... 140 0.92 0.08 1.00 0.14 0.46 AUG 23... 0.1 32 150 142 <1 0.89 0.01 0.90 0.06 0.14 K non-ideal count 303 RIO GRANDE DE MASCO BASIN 50146000 RIO GRANDE DE ANASCO NEAR ANASCO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (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 NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1988 04... 0.3 1.3 5.8 0.04 <1 <100 40 <1 12 20 DEC 14... 0.3 1.0 4.4 0.04 FEB 1989 08... 0.2 0.5 2.2 0.03 APR 12... 0.2 1.2 4.3 0.08 <1 100 20 <1 7 20 JUN 08... 0.6 1.6 7.1 0.07 AUG 23... 0.2 1.1 4.9 0.07 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- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1988 04... 4100 <5 170 <0.1 <1 <1 20 <0.01 4 0.03 DEC 14... FEB 1989 08... APR 12... 4700 <5 300 <0.1 <1 <1 20 <0.01 <1 0.02 JUN 08... AUG 23... PESTICIDE ANALYSES CHLOR- DI- DI- ENDO- PCB, ALDRIN, DANE, ODD, DDE, DDT, AZINON, ELDRIN SULFAN, DATE 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) JUN 08... 0930 <0.1 <0.01 <0.1 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 HEPTA- METH- METHYL METHYL HEPTA- CHLOR MALA- OXY- PARA- TRI- ENDRIN, ETHION, CHLOR, EPDXIDE LINDANE THION, CHLOR, THION, THION, MIREX, DATE 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) JUN 08... <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 NAPH- THA- LENES, PARA- POLY- PER- TOX- TOTAL THION. CHLOR. THANE APHENE, TRI- 2,4-0. 2.4,5-7 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) JUN 08... <0.01 <0.1 <0.1 <1 <0.01 304 THIS PAGE WAS LEFT BLANK INTENTIONALLY im ,r3,GUADIL.LA ( ) ri 020 ----......,?______ . Drainage boundary uncertain • :P.\,/. & MO / i .......-,, ,, do i e /6 • .'—s\--P. R‘b Guo obo r/ ,/ ---—,„„,, / , pN--­ I rf / 0°'51.'---^c-j *--------, ----, -\-, c-17 3sAN S6ASTIAl Rio Guojotoco Dos' Coastal basin 4 LARES Rio Grande de Masco basin • /Drainage boundary EXPLANATION A1478 SURFACE—WATER STATION AND NUMBER 1476 QUALITY—OF—WATER STATION AND NUMBER 083 WELL AND WELL NUMBER ; iap area A66Abil-A--------""-,-------.......„ S40.4.AJAN • -....,, .,e.,,,. .... . °ARECIBO FAJAIi00i1 VAAYAGU Z CAGUAS. I ;,........„„ „4,.....710E. ellAYA A ,,Jj 4 K 4 MILES Figure 26.--Rio Culebrinas basin. I 306 RIO CULEBRINAS BASIN 50147600 RIO CULEBRINAS NEAR SAN SEBASTIAN, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°20'51", 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 i (3.4 km) west of Central La Plata. DRAINAGE AREA.--58.2 mil (150.7 km 2). PERIOD OF RECORD.--Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 DIS- OXYGEN, OXYGEN COLI- STREP­ CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1988 05... 1325 142 273 8.00 24.0 112 8.3 98 31 4700 K1200 DEC 15... 0730 53 260 7.90 22.5 4.1 7.1 81 <10 K780 920 FEB 1989 09... 0810 26 302 7.80 21.0 6.1 7.0 77 12 880 760 APR 13... 1005 41 406 8.10 23.0 24 8.1 94 <10 960 K280 JUN 07... 1230 101 316 7.70 24.0 85 7.7 90 27 K7000 3200 AUG 22... 1400 106 287 7.80 25.5 12 7.4 90 24 K15000 2400 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SLUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1988 05... 120 8 42 3.8 12 0.3 2.0 110 <0.5 14 8.0 DEC 15... 100 FEB 1989 09... 110 APR 13... 150 0 49 6.9 21 0.8 6.6 150 <0.5 18 19 JUN 07... 120 AUG 22... 130 3 44 5.1 11 0.4 2.2 120 12 9.0 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 05... 0.1 14 160 61 160 1.28 0.02 1.30 0.05 0.25 DEC 15... 12 1.42 0.08 1.50 0.03 0.17 FEB 1989 09... 8 1.22 0.08 1.30 0.09 0.51 APR 13... 0.1 28 240 27 10 1.60 0.10 1.70 0.08 0.52 JUN 07... 117 1.02 0.08 1.10 0.12 0.38 AUG 22... 0.1 28 186 53 10 0.77 0.03 0.80 0.01 0.49 K = non-ideal count RIO CULEBRINAS BASIN 50147600 RIO CULEBRINAS NEAR SAN SEBASTIAN, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 NITRO- CHRO- GEN,AM- BARIUM. BORON, CADMIUM M1UM, COPPER, MONIA + NITRO- NITRO- PROS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (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 NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1988 05... 0.3 1.6 7.1 0.05 1 100 40 <1 16 20 DEC 15... 0.2 1.7 7.5 0.11 FEB 1989 09... 0.6 1.9 8.4 0.22 APR 13... 0.6 2.3 10 0.24 2 200 40 <1 1 10 JUN 07... 0.5 1.6 7.1 0.13 AUG 22... 0.5 1.3 3.9 0.04 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- MIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1988 05... 8500 <5 220 <0.1 <1 <1 30 <0.01 3 0.06 DEC 15... FEB 1989 09... APR 13... 400 <5 40 <0.1 <1 <1 <10 <0.01 0.05 <1 JUN 07... AUG 22... 307 I RIO CULEBRINAS BASIN 308 50147800 RIO CULEBRINAS AT HIGHWAY 404 NEAR MOCA, PR LOCATION.--Lat 18'21'42", long 67'05'33", Hydrologic Unit 21010003, on right bank, at bridge on Highway 404, 0.3 mi (0.5 km) downstream fro Quebrada Yagruma, and 2.8 mi (4.5 km) southeast of Moca. DRAINAGE AREA.--71.2 psi' (184.4 km2 ). WATER-DISCHARGE RECORDS PERIOD OF 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. AVERAGE DISCHARGE.--22 years (1968-89), 302 ft'is (8.553 m3/s), 57.60 in/yr (1,463 mm/yr), 218,800 acre-ft/yr (270 hiP/yr); median of yearly mean discharges, 290 ft'is (8.21 m'/s), 210,000 acre-ft/yr (260 hm'/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 69,000 ft'/s (1,950 m 3/s), Sept. 16, 1975, gage height, 36.6 ft (11.16 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 10/s) on basis of slope-area and contracted-opening measurements of peak flow; minimum discharge, 16 ft'/s (0.453 m'/s), Apr. 17-19, 1979. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 11,300 ftl/s (320 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (W/s) (m3/s) (ft) (m) Date Time (ft3/s) (11 3/s) (ft) (m) Oct. 26 unknown *22,500 637 *26.77 8.159 July 19 2015 11,800 334 22.70 6.919 Minimum discharge, 33 ft'is (0.934 m'/s), Feb. 13, 14, 24. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 488 e350 96 65 46 56 380 173 190 122 891 251 2 336 e240 94 82 43 133 163 143 650 342 125 233 3 240 e210 92 85 44 49 111 137 109 237 227 262 4 211 208 90 41 81 501 211 63 43 93 139 221 5 703 191 102 61 42 39 182 113 242 274 184 206 6 224 208 115 59 39 38 201 75 136 159 180 197 7 328 188 91 57 41 40 123 87 133 121 164 186 8 1310 165 88 57 39 36 89 265 108 127 170 180 9 431 158 85 56 40 39 100 188 117 100 440 617 10 972 153 84 54 39 38 67 157 90 91 633 e385 11 329 163 83 56 40 38 63 130 84 276 531 e250 12 240 183 80 54 38 353 61 86 80 822 345 e246 13 219 400 84 53 35 134 60 135 77 1700 218 e271 14 208 295 80 51 38 73 61 73 684 214 125 303 15 395 184 78 52 38 56 56 83 70 328 442 244 72 50 55 71 72 199 475 185 17 222 163 75 49 48 49 48 64 257 185 366 166 18 244 141 74 47 41 47 49 59 523 677 360 519 19 1550 132 73 48 41 51 44 56 199 16 305 155 77 51 1790 593 594 20 1880 128 75 53 66 100 44 54 164 665 312 286 21 528 123 77 54 46 81 40 52 89 407 239 703 22 385 121 76 51 43 51 39 50 301 300 237 536 23 308 121 76 48 38 44 101 278 255 463 48 278 24 242 116 74 46 35 44 99 46 929 235 1590 468 25 224 112 77 50 53 41 50 45 256 666 601 616 26 e4730 110 76 49 117 47 43 80 145 361 830 261 27 e3000 106 71 54 52 41 50 103 175 237 754 561 28 el500 104 69 49 45 482 66 207 38 293 485 1320 29 e1700 102 67 47 --- 360 331 362 38 229 346 477 30 el000 99 67 46 36 406 211 189 398 233 320 31 e500 --- 65 44 109 --- 238 --- 177 269 --- TOTAL 24952 5129 2511 1691 1300 2032 3535 3741 6321 12809 13318 11420 MEAN 805 171 81.0 54.5 46.4 65.5 118 121 211 413 430 381 MAX 4730 400 115 85 117 353 482 406 929 1790 1590 1320 MIN 208 99 65 44 35 36 39 45 70 91 164 166 4030 25410 26420 22650 5.35 AC-FT 49490 10170 4980 3350 2580 7010 7420 12540 CFSM 11.3 2.40 1.14 .77 .65 .92 1.65 1.69 2.96 5,80 6.03 IN. 13.04 2.68 1.31 .88 .68 1.85 1.95 3.30 6.96 1.06 6.69 5.97 CAL YR 1988 TOTAL 107274 MEAN 293 MAX 6750 MIN 22 AC-FT 212800 CFSM 4.12 IN. 56.05 WTR YR 1989 TOTAL 88759 MEAN 243 MAX 4730 MIN 35 AC-FT 176100 CFSM 3.42 IN. 46.37 e Estimated RIO CULEBRINAS BASIN 309 50147800 RIO CULEBRINAS AT HIGHWAY 404 NEAR MOCA, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS AUGUST 1981 TO CURRENT YEAR STREAMFLOW. SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) OCT. 06 0928 223 197 24.0 APR, 06 0931 194 293 23.5 DEC, 06 0904 116 250 22.5 MAY. 09 1038 171 238 23.0 JAN, 11 0855 56 244 22.5 JUN, 09 0927 134 148 25.0 FEB, 02 0852 40 233 22.5 AUG, 09 0912 152 210 25.0 MAR. 07 1100 39 270 23.0 SEP, 13 1023 220 125 25.0 310 RIO CULEBRINAS BASIN 50149100 RIO CULEBRINAS NEAR AGUADA, 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 mil (251.2 km 2 ). PERIOD OF RECORD.--Water years 1958, 1970 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL. CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1988 04... 1320 311 316 7.70 24.0 13 7.2 85 30 K7000 K1000 DEC 14... 0910 114 288 7.90 24.0 3.2 7.7 91 10 K100 K200 FEB 1989 08... 0930 13 332 6.80 25.5 1.6 3.3 40 33 K640 2000 APR 12... 1135 62 421 7.50 26.0 11 4.9 59 14 2800 59000 JUN 07... 0945 214 400 7.90 25.0 42 4.6 55 37 3900 2200 AUG 23... 0900 250 327 7.80 25.5 31 9.9 120 11 K2000 K400 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SLUM, SODIUM, AD- SIUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED ZION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS 5) AS SO4) AS CL) OCT 1988 04... 120 2 41 3.9 6.6 0.3 1.8 130 .0.5 14 8.8 DEC 14... 130 FEB 1989 08... 150 APR 12... 170 0 57 7.9 16 0.5 6.2 170 <0.5 14 17 JUN 07... 150 AUG 23... 140 B 48 5.8 12 0.4 2.7 140 12 11 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, 01S- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENOED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1988 04... 0.1 16 160 134 89 0.99 0.01 1.00 0.04 0.46 DEC 14... 8 0.88 0.02 0.90 0.04 0.36 FEB 1989 08... 4 0.39 0.01 0.40 0.01 0.89 APR 12... 0.1 28 251 42 28 0.48 0.02 0.50 0.15 0.95 JUN 07... 83 0.67 0.03 0.70 0.10 0.80 AUG 23... 0.1 28 204 137 53 0.69 0.01 0.70 0.05 0.35 K = non-ideal count E estimate 311 RIO CULEBRINAS BASIN 50149100 RIO CULEBRINAS NEAR AGUADA, PR--Continued NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (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 NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1988 04... 0.5 1.5 6.6 0.05 1 100 30 <1 22 20 DEC 14... 0.4 1.3 5.8 0.07 FEB 1989 08... 0.9 1.3 5.8 0.16 APR 12... 1.1 1.6 7.1 0.09 1 100 90 1 20 30 JUN 7... 0.9 1.6 7.1 0.20 AUG 23... 0.4 1.1 4.3 0.04 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- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) MANGA- OCT 1988 04... 1100 24 360 <0.1 <1 <1 40 <0.01 3 0.05 DEC 14... FEB 1989 8... APR <1 12... 870 6 270 <0.1 <1 <1 <10 <0.01 0.04 JUN 01... AUG 23... PESTICIDE ANALYSES DI- DI- ENDO- PCB, ALDRIN, DANE, ODD, DDE, DOT, AZINON, ELDRIN SULFAN, DATE 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) CHLOR- JUN 01... 0945 <0.1 <0.01 <0.1 <0.01 <0.01 <0.01 0.05 <0.01 <0.01 HEPTA- METH- METHYL METHYL HEPTA- CHLOR MALA- OXY- PARA- TRI- ENDRIN, ETHION, CHLOR, EPDXIDE LINDANE THION, CHLOR, THION, THION, MIREX, DATE 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) JUN 07... <0.01 <0.01 <0.01 <0.01 <0.01 0.01 <0.01 <0.01 <0.01 <0.01 NAPH­ THA­ LENES, PARA- POLY- PER- TOX- TOTAL THION, CHLOR. THANE APHENE, TRI- 2,4-0, 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) JUN 07... <0.01 <0.1 <0.01 0.44 <0.01 <0.01 <0.1 <1 <0.01 312, THIS PAGE WAS LEFT BLANK INTENTIONALLY 313 314* 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 1989 PUBLICATION RECORD STATION STATION LOCATION DRAINAGE STREAM- AREA FLOW NUMBER NAME AND mil DATE TIME cfs (km2) (cms) BASIN Quebrada Blasina basin 50050300 Quebrada Blasina near Lat 18°23'27"", long 65°58'28" 2.96 4/19/89 0655 22.1 Carolina, PR Hydrologic unit 21010005. (7.67) (0.63) At bridge on Hwy 3, 1.4 mi (2.3 km) south of Valle A- 6/21/89 0635 17.0 rriba Heights, and 1.2 mi (0.48) (1.9 km) west-southwest of Carolina. Rio Grande de Loiza basin 50051010 Rio Grande de Loiza Lat 18°07'23"", long 65.'59'18" 12.2 4/17/89 1045 32.9 below Rio Emajagua, PR Hydrologic unit 21010005. (31.6) (0.93) 200 ft (61 m) below junc­ tion with Rio Emajagua and 6/20/89 1415 18.0 400 ft (122 m) north of Hwy (0.51) 181 and Hwy 745 intersection. 50051140 Rio Grande de Loiza at Lat 18°09'29"", long 65°58'48" 17.8 4/17/89 1210 40.6 Jagual, PR Hydrologic unit 21010005. (46.1) (1.15) 200 ft (61 a) east of Jagual School on Hwy 181 and 1.7 6/21/89 1310 23.3 mi (2.8 km) above junction (0.66) with Rio Cayaguas. 50052300 Rio Grande de Loiza at Lat 18°11'39"", long 65°57'46" 46.0 4/17/89 1410 78.0 San Lorenzo North, PR Hydrologic unit 21010005. (119) (2.21) Above sewage treatment plant on north side of San Lorenzo, 6/21/89 1430 40.4 0.2 mi (0.3 km) northwest of (1.14) the plaza, and 1.6 mi (2.6 km) downstream from Rio Cayaguas. 50052700 Rio Grande de Loiza at Lat 18"12'22"", long 65'59'23" 50.9 4/17/89 1505 74.0 Hwy 183, PR Hydrologic unit 21010005. (132) (2.10) 2.1 mi (3.4 km) northwest of Plaza de San Lorenzo and 1.8 6/21/89 1535 40.2 mi (2.9 km) downstream from (1.14) bridge on Hwy 181. 50052900 Quebrada las Bambuas at Lat 18°13'31'", long 66°00'58" 2.33 4/17/89 0910 1.44 mouth, PR Hydrologic unit 21010005. (6.03) (0.04) 300 ft (91 m) upstream from bridge on Hwy 183 and 900 ft 6/20/89 1310 0.75 (275 a) above junction with (0.02) Rio Grande de Loiza. 50053050 Rio Turabo at Borinquen, Lat 18°10'11', long 66°02'37' 7.79 4/18/89 1350 14.0 PR Hydrologic unit 21010005. (20.2) (0.40) At bridge on Hwy 765 and 1.2 mi (1.9 km) north of 6/19/89 1010 8.02 Escuela Anon. (0.23) 3.15 DISCHARGE AT PARTIAL-RECORD STATIONS Low-flow partial-record stations--Continued STATION NUMBER STATION NAME LOCATION AND DRAINAGE AREA mi' DATE TIME STREAM- FLOW cfs BASIN (km') (cms) Rio Grande de Loiza basin 50053300 Quebrada Beatriz above Rio Turabo, PR Lat 18°11'15", long 66°03'04" Hydrologic unit 21010005. 1,400 ft (425 m) downstream from bridge on Hwy 765 and 400 ft (120 m) above junction with Rio Turabo. 5.65 (14.6) 4/18/89 6/19/89 1500 1130 6.70 (0.19) 3.90 (0.11) 50053500 Rio Turabo below Quebrada Beatriz, PR Lat 18°11'22", long 66°03'02" Hydrologic unit 21010005. 0.9 mi (1.4 km) downstream from bridge on Hwy 765 and 400 ft (120 m) below junction with Quebrada Beatriz. 17.3 (44.8) 4/18/89 6/19/89 1540 1215 22.0 (0.62) 13.7 (0.39) 50054500 Rio Turabo at Caguas, PR Lat 18°13'36", long 66°01'40" Hydrologic unit 21010005. At bridge on Hwy 183, 0.9 mi (1.5 km) southeast of the plaza in Caguas, and 1.3 mi (2.1 km) upstream from Rio Grande de Loiza. 29.3 (75.9) 4/17/89 6/20/89 0755 1210 25.0 (0.71) 8.98 (0.25) 50055310 Rio Caguitas above mouth, PR Lat 18'15'22", long 66°01'06" Hydrologic unit 21010005. 0.5 mi (0.7 km) downstream from bridge on Hwy 30 and 0.4 mi (0.7 km) above junc- tion with Rio Grande de Loiza 18.0 (46.6) 4/18/89 6/20/89 1230 1035 29.5 (0.84) 20.8 (0.59) 50055410 Rio Bairoa at mouth, PR Lat 18°15'47", long 66°01'09" Hydrologic unit 21010005. 0.8 mi (1.2 km) downstream from bridge on Hwy 30 and 0.4 mi (0.6 km) above junc- tion with Rio Grande de Loiza 7.51 (19.4) 4/18/89 6/20/89 1105 0920 6.90 (0.20) 4.11 (0.12) 50055500 Quebrada Honda at Las Torres, PR Lat 18°13'15", long 65°49'57" Hydrologic unit 21010005.At bridge on Hwy 31, 100 ft (30 m) east of Hwy 31 and Hwy 936 intersection, and 1.8 mi (2.9 km) above junc­ tion with Rio Gurabo. 1.15 (2.98) 4/19/89 6/21/89 0850 0855 0.15 (0.004) 0.40 (0.01) 50055600 Rio Gurabo at Ceiba Norte, PR Lat 18°13'29", long 65°51'34" Hydrologic unit 21010005. 0.4 mi (0.6 km) downstream from bridge on Hwy 31 and 0.2 mi (0.4 km) below junc- tion with Quebrada Honda. 12.0 (31.1) 4/19/89 6/21/89 0735 0755 8.68 (0.25) 3.16 (0.09) 50055700 Rio Gurabo at El Mango, PR Lat 18°13'56", long 654 52'52" Hydrologic unit 21010005. 1.2 mi (2.0 km) upstream from bridge on Hwy 31 and 0.2 mi (0.4 km) above junc- tion with Quebrada Grande. 16.5 (42.7) 4/19/89 6/21/89 0935 1005 11.5 (0.32) 6.38 (0.18) 50056000 Rio Valenciano near Las Piedras, PR Lat 18°10'37", long 65°54'21" Hydrologic unit 21010005. At bridge on Hwy 183 (km 17.3), and 3.2 mi (5.1 km) west of Las Piedras. 6.85 (17.7) 4/19/89 6/21/89 0810 0700 10.5 (0.30) 9.59 (0.27) 50056550 Rio Valenciano at mouth, PR Lat 18°14'13", long 65°55'13" Hydrologic unit 21010005. 0.6 mi (1.0 km) downstream from bridge on Hwy 31 and 1,000 ft (305 m) above junc- tion with Rio Gurabo. 19.0 (49.2) 4/19/89 6/21/89 1050 1005 18.6 (0.53) 13.3 (0.38) 316 DISCHARGE AT PARTIAL-RECORD STATIONS Low-flow partial-record stations--Continued STATION STATION LOCATION DRAINAGE STREAM- NUMBER NAME AND AREA mi' DATE TIME FLOW cfs BASIN (km') (cms) Rio Grande de Loiza basin 50056600 Rio Gurabo near Juncos, PR Lat 18°14'38", long 65°55'25" Hydrologic unit 21010005. At bridge on Hwy 185 and 0.4 mi (0.6 km) below junc- tion with Rio Valenciano. 50.0 (130) 4/19/89 6/21/89 1150 1120 41.0 (1.16) 23.4 (0.66) 50057015 Rio Gurabo below Hwy 943, PR Lat 18°15'50", long 65°58'41" Hydrologic unit 21010005. 0.6 mi (0.9 km) northeast of Plaza de Gurabo and 0.7 mi (1.2 km) downstream from bridge on Hwy 181. 62.4 (162) 4/19/89 6/20/89 1340 0730 41.5 (1.18) 26.3 (0.74) 50058400 Rio Canas above Lago Loiza, PR Lat 18°17'34", long 66°02'33" Hydrologic unit 21010005. At bridge about 2000 ft (610 m) off Hwy 1, 1.0 mi (1.6km) upstream from Lago Loiza, 1.0 mi (1.6 km) north of La Barra, and 4.0 mi (6.4 km) north of Caguas. 7.63 (19.8) 4/18/89 6/19/89 0825 1430 8.15 (0.23) 8.24 (0.23) 50059000 Lago Loiza at Damsite, PR Lat 18°19'49", long 66°01'00" Hydrologic unit 21010005. At pumphouse at damsite and 1.9 mi (3.1 km) south of Trujillo Alto Plaza. 208 (539) 4/18/89 6/19/89 0825 1530 7.49 (0.21) 6.87 (0.19) 50059200 Quebrada Grande at La Gloria, PR Lat 18°20'28", long 65°59'20" Hydrologic unit 21010005, 400 ft (122 m) downstream from bridge on Hwy 181, 200 ft (61 m) below junction with Quebrada Grande, and 1.5 mi (2.4 km) above junc- tion with Rio Grande de Loi- 12.0 (31.1) 4/19/89 6/21/89 1225 1255 4.68 (0.13) 3.72 (0.10) za. 50060000 Rio Grande de Loiza above Carolina, PR Lat 18°22'10", long 65°57'50" Hydrologic unit 21010005. 0.5 mi (0.8 km) west of Tru­ jillo Bajo and 0.2 mi (0.3 km) northwest of intersection of Hwys 853 and 858. 230 ( 596) 4/19/89 6/21/89 1100 1215 Ponded Ponded 50060200 Quebrada Maracuta at Trujillo Bajo, PR Lat 18'22'11", long 65°57'28" Hydrologic unit 21010005. At bridge on Hwy 853 and 0.3 mi (0.5 km) above junc­ tion with Rio Grande de Loi­ 10.2 (26.4) 4/19/89 6/21/89 1005 1100 2.92 (0.08 3.60 (0.10) za. 50061000 Rio Grande de Loiza at Carolina, PR Lat 18°22'39", long 65°57'08' Hydrologic unit 21010005. At bridge on Hwy 3, 0.5 mi (0.8 km) southeast of Ca­ rolina Plaza, and 9.1 mi (14.6 km) upstream from mouth. 243 (629) 4/19/89 6/21/89 0800 0730 Ponded Ponded 50061200 Rio Canovanillas at Carruzos, PR Lat 18°19'03', long 65'54'16' Hydrologic unit 21010005. At bridge on road 500 ft (152 m) off Hwy 185, and 0.7 mi (1.1 km) east of Jesus T. Pinero School. 9.10 (23.6) 4/18/89 6/20/89 1200 1220 3.26 (0.09) 3.00 (0.08) 50061500 Rio Canovanillas at Loiza, PR Lat 18°22'44", long 65°55'00" Hydrologic unit 21010005.At bridge on Hwy 3, 0.9 mi (1.4 km ) upstream from Rio Gran­ de de Loiza, and 1.0 mi (1.6 km) west of Loiza. 16.5 (42.7) 4/19/89 6/21/89 0845 0905 4.85 (0.14) 5.41 (0.15) 317 DISCHARGE AT PARTIAL-RECORD STATIONS Low-flow partial-record stations--Continued STATION NUMBER STATION NAME LOCATION AND BASIN DRAINAGE AREA mi l (km') DATE TIME STREAM- FLOW cfs (cms) Rio Grande de Loiza basin 50061900 Rio Canovanas at La Marina, PR 5 Lat 18°21'01", long 65°53 Hydrologic unit 21010005. 100 ft (30 m) east of Hwy 185 and 0.9 mi (1.5 km) downstream from bridge on Hwy 957. 14.6 (37.8) 4/18/89 6/20/89 1315 1330 16.0 (0.45) 10.3 (0.29) 50062000 Rio Canovanas at Loiza, PR Lat 18°22'53", long 65°53'33" Hydrologic unit 21010005.At bridge on Hwy 958 and 0.3 mi (0.5 km) east of Loiza. Rio Herrera basin 17.0 (44.0) 4/18/89 6/21/89 1420 0750 12.2 (0.34) 3.21 (0.09) 50062500 Rio Herrera near Colonia Lat 18°21'02", long 65°52'00" Dolores, PR Hydrologc unit 21010005. On right bank, at bridge on on Hwy 958, 2.0 mi (3.2 km) south of Colonia Dolores, and 3.2 mi (5.1 km) south­ west of Rio Grande. 2.75 (7.12) 4/18/89 6/20/89 0845 0905 3.91 (0.11) 4.08 (0.12) 50062800 Rio Herrera near Loiza, PR Lat 18°22'48", long 65°51'33" Hydrologic unit 21010005.At bridge on Hwy 3, 1.9 mi (3.1 km) west of Rio Gran­ de, and 2.8 mi (4.5 km) east of Loiza. 3.86 (10.0) 4/18/89 6/20/89 0945 1000 4.52 (0.13) 4.71 (0.13) 50063000 Quebrada Cambalache near Loiza, PR Lat 18°22'49", long 65°52'04" Hydrologic unit 21010005.At bridge on Hwy 3, 2.2 mi (3.5 km) east of Loiza, and 2.5 mi (4.0 km) west of Rio Grande. 1.32 (3.42) 4/18/89 6/20/89 1045 1105 0.27 (0.008) 0.67 (0.02) Rio Espiritu Santo basin 50063540 Rio Espiritu Santo at Camp Eliza Colberg, PR Lat 18°20'22", long 65'49'42" Hydrologic unit 21010005. 3.1 mi (4.9 km) northwest of Pico El Yunque and 0.8 mi (1.3 km) below junction with Quebrada Sonadora. 5.27 (13.7) 4/17/89 6/19/89 0950 1110 36.8 (1.04) 15.5 (0.44) 50063850 Quebrada Jimenez near Rio Grande, PR Lat 18°21'36", long 65°48'47" Hydrologic unit 21010005. 300 ft (91 m) upstream from Rio Espiritu Santo and 1.9 mi (3.1 km) southeast of Rio Grande. 3.63 (9.40) 4/17/89 6/19/89 1105 1220 14.3 (0.40) 8.07 (0.23) 50064200 Rio Grande near El Verde, PR Lat 18°20'43", long 65°50'30" Hydrologic unit 21010005.0n left bank, 400 ft (120 m) upstream from bridge on Hwy 960, 500 ft (150 m) south­ west of junction of Hwys 956 U 960, 1.1 mi (1.8 km) west of El Verde, and 2.7mi (4.3km) south of Rio Grande. 7.31 (18.9) 4/18/89 6/20/89 0725 0750 19.3 (0.55) 10.7 (0.30) 50064500 Rio Grande at Rio Grande, PR Lat 18°22'40", long 65°49'28" Hydrologic unit 21010005.At bridge on Hwy 3, 0.5 mi (0.8 km) southeast of Rio Grande, and 0.8 mi (1.3km) upstream from Rio Espiritu Santo. 10.4 (26.9) 4/17/89 4/19/89 0830 1000 17.4 (0.49) 12.3 (0.35) 50064900 Quebrada Juan Gonzalez near Rio Grande, PR Lat 18°22'37", long 65°48'04" Hydrologic unit 21010005.At bridge on Hwy 955, 800 ft (244 m) upstream from bridge on Hwy 3, and 1.5 mi (2.4 km) above junction with Rio Es­ pirutu Santo. 2.17 (5.62) 4/17/89 6/19/89 1225 1330 2.94 (0.08) 3.66 (0.10) 318 DISCHARGE AT PARTIAL-RECORD STATIONS Low-flow partial-record stations--Continued STATION NUMBER STATION NAME LOCATION AND BASIN DRAINAGE AREA mi' (km') DATE TIME STREAM­ FLOW cfs (cms) Rio Mameyes basin 50065700 Rio Mameyes at Hwy 191 at Mameyes, PR Lat 18°22'03", long 65°46'14" Hydrologic Unit 21010005, 0.2 mi (0.3 km) upstream from Quebrada Anon, 0.3 mi (0.5 km) downstream from Quebrada Tabonuco, and 0.3 mi (0.5 km) south of Mameyes. 11.8 (30.6) 4/17/89 6/19/89 1330 1425 47.3 (1.34) 27.8 (0.79) 50066000 Rio Mameyes at Mameyes, PR Lat 18°22'30", long 65°45'50" Hydrologic unit 21010005. At bridge on Hwy 3, 0.5 mi (0.8 km) downstream from Quebrada Anon, 0.5 mi (0.8 km) east of Mameyes (Palmer Post Office), and 3.1 mi (5.0 km) west of Luquillo. 13.5 (35.0) 4/17/89 6/19/89 1430 1510 48.2 (1.36) 30.2 (0.86) Quebrada Mata de Platano basin 50066500 Quebrada Mata de Platano near Luquillo, PR Lat 18°22'52", long 65°43'16" Hydrologic unit 21010005. At bridge on Hwy 3, 0.4 mi (0.6 km) northwest of Lu­ quillo Plaza, and 0.3 mi (0.5 km) above mouth. 2.38 (6.16) 4/17/89 6/19/89 0830 1015 Dry Dry Rio Sabana basin 50068000 Rio Sabana at Luquillo, PR Lat 18°22'15", long 65°42'51" Hydrologic unit 21010005.At Hwy 3 bridge and 0.4 mi (0.6 km) southwest of Luquillo. Rio Pitahaya basin 7.05 (18.3) 4/17/89 6/19/89 0850 1030 6.94 (0.20) 7.68 (0.22) 50069000 Rio Pitahaya near Luquillo, PR Lat 18°21'32", long 65°42'03" Hydrologic unit 21010005.At bridge on Hwy 3, 1.6 mi (2.6 km) southeast of Luquillo, and 1.7 mi (2.7 km) upstream from Rio Sabana. 4.51 (11.7) 4/17/89 6/19/89 0940 1155 4.24 (0.12) 5.36 (0.15) Rio Juan Martin basin 50069300 Tributary to Rio Juan Martin at Hwy 3, PR Lat 18°21'14", long 65°40'59" Hydrologic unit 21010005.At bridge on Hwy 3 and 200 ft (61 m) above junction with Rio Juan Martin. 0.53 (1.37) 4/17/89 6/19/89 1125 1125 0.02 (0.001) 0.02 (0.001) 50069350 Rio Juan Martin above mouth, PR Lat 18°21'44", long 65°40'35" Hydrologic unit 21010005. 0.8 mi (1.2 km) downstream from bridge on Hwy 3 and 0.4 mi (0.7 km) above mouth. 2.41 (6.24) 4/17/89 6/19/89 1035 1540 0.36 (0.01) 0.55 (0.02) Quebrada Fajardo basin 50069400 Quebrada Fajardo at Hwy 194, PR Lat 18°20'49", long 65°39'55" Hydrologic unit 21010005. At bridge on Hwy 194, 0.5 mi (0.8 km) east of Hwy 194 and Hwy 3 intersection, and 1.5 mi (2.4 km) above mouth. 1.16 (3.00) 4/17/89 6/20/89 1135 0720 0.07 (0.002) 0.11 (0.003) Rio Fajardo basin 50071200 Rio Fajardo at Vapor below Confluence, PR Lat 18°18'28", long 65°40'10" Hydrologic unit 21010005. 1.7 mi (2.8 km) southwest of Plaza de Fajardo and 1.4 mi (2.3 km) upstream from bridge on Hwy 3. 19.4 (50.0) 4/17/89 6/19/89 1530 1410 20.8 (0.59) 26.0 (0.74) I 319 DISCHARGE AT PARTIAL-RECORD STATIONS Low-flow partial-record stations--Continued STATION NUMBER STATION NAME LOCATION AND BASIN DRAINAGE AREA mi' (km 2 ) DATE TIME STREAM- FLOW cfs ( ems) Rio Fajardo basin 50072000 Rio Fajardo at Fajardo, PR Lat 18°19'11", long 65°39'07" Hydrologic unit 21010005. At bridge on Hwy 3, 0.5 mi (0.8 km) south of Fajardo, and 2.5 mi (4.0 km) upstream from mouth. 21.6 (55.9) 4/17/89 6/19 /89 1230 1305 19.4 (0.55) 27.5 (0.78) 50072600 Quebrada Mata Redonda near Fajardo, PR Lat 18°19'34", long 65°39'00" Hydrologic unit 21010005.At bridge on Hwy 3, 1.2 mi (2.0 km) south of Plaza de Fa- jardo, and'1.7 mi (2.7 km) above junction with Rio Fa­ jardo. 1.34 (3.47) 4/17/89 6/19/89 1400 1355 Dry Dry Rio Demajagua basin 50072700 Rio Demajagua at Demajagua, PR Lat 18°17'10", long 65°38'21" Hydrologic unit 21010005. At bridge on Hwy 3, 200 ft (61 m) south of Hwy 3 and Hwy 982 intersection, and 0.3 mi (0.5 km) above mouth. 1.61 (4.17) 4/18/89 6/20/89 0705 0740 0.07 (0.002) 0.10 (0.003) Quebrada Ceiba basin 50072800 Quebrada Ceiba at Ceiba, PR Lat 18°16'25', long 65°38'25" Hydrologic unit 21010005.At bridge on Hwy 3, 0.8 mi (1.3 km) northeast of Plaza de Ceiba, and 0.8 mi (1.3 km) above mouth. 2.15 (5.57) 4/18/89 6/20/89 0735 0845 1.42 (0.04) 1.29 (0.04) Quebrada Aguas Claras basin 50072900 Quebrada Aguas Claras near Ceiba, PR Lat 18°16'03", long 65°38'20" Hydrologic unit 21010005.At bridge on Hwy 979 and 0.6 mi (0.9 km) above mouth. Rio Daguao basin 0.83 (2.15) 4/18/89 6/20/89 0823 0805 0.16 (0.004) 0.08 (0.002) 50073200 Rio Daguao at Daguao, PR Lat 18°13'42", long 65°40'39" At railroad bridge, 0.1 mi (0.2 km) downstream from bridge on Hwy 3, 0.3 mi (0.5 km) east of Daguao, and 2.8 mi (4.5 km) upstream from mouth. 2.26 (5.85) 4/18/89 6/20/89 0905 0920 0.76 (0.02) 0.63 (0.02) 50073300 Rio Daguao above mouth, PR Lat 18°13'36", long 65°39'31" Hydrologic unit 21010005. At bridge 650 ft (200 m) downstream from bridge on Langley Drive and 0.9 mi (1.4 km) above mouth. 4.29 (11.1) 4/18/89 4/20/89 0810 0825 Ponded Ponded Quebrada Palma basin 50073400 Quebrada Palma at Daguao, PR Lat 18°13'16", long 65'41'30" Hydrologic unit 21010005. At bridge on Hwy 3, 0.8 mi (1.3 km) southwest of Oa- guao, and 1.7 mi (2.7 km) upstream fro mouth. 4.84 (12.5) 4/18/89 6/20/89 1005 1015 1.82 (0.05) 1.41 (0.04) Quebrada Botija basin 50073500 Quebrada Botija at Hwy 31, PR Lat 18°12'55", long 65°42'25" Hydrologic unit 21010005. At bridge on Hwy 31, 500 ft (152 0 upstream from bridge on Hwy 3, and 1.6 mi (2.6 km) above mouth. 1.10 (2.85) 4/18/89 6/20/89 1035 1045 0.22 (0.006) 0.07 (0.002) I 320 DISCHARGE AT PARTIAL-RECORD STATIONS Low-flow partial-record stations--Continued STATION NUMBER STATION NAME LOCATION AND BASIN DRAINAGE AREA mi l (km') DATE TIME STREAM- FLOW cfs (cms) Rio Santiago basin 50074000 Rio Santiago at Naguabo, PR Lat 18°12'57", long 65°43'41" Hydrologic unit 21010005.At bridge on Hwy 31, 0.3 mi (0.5 km) northeast of Nagua- bo, 0.4 mi (0.6 km) downstream fro Quebrada Grande, and 2.2 mi (3.5 km) upstream from mouth. 4.99 (12.9) 4/18/89 6 / 20/89 1100 1105 3.93 (0.11) 3.37 (0.10) 50074010 Tributary to Rio Santiago at Hwy 192, PR Lat 18°12'04", long 65°43'33" Hydrologic unit 21010005. At bridge on Hwy 192 and 0.7 mi (1.1 km) above junc- tion with Rio Santiago. 1.08 (2.80) 4/18/89 6/20/89 1150 1145 Dry Dry Rio Blanco basin 50076000 Rio Blanco near Florida, PR Lat 18°13'45', long 65°47'06" Hydrologic Unit 2101005. 0.5 mi (0.8 Km) upstream from Quebrada Sonadora, 0.7 mi (1.1 km) upstream from intersection of Hwy 191 and 31, and 0.8 mi (1.3 km) south of Florida. 12.3 (31.9) 4/18/89 6/21/89 1110 1015 57.4 (1.62) 56.5 (1.60) 50077000 Rio Blanco at Rio Blanco, PR Lat 18°13'09", long 65°46'57" Hydrologic unit 21010005. At bridge on Hwy 31 and 0.4 mi (0.6 km) east of Rio Blanco. 17.6 (45.6) 4/19/89 6/21/89 1210 1110 45.1 (1.28) 4.15 (0.12) 50077500 Rio Blanco below La Fe, PR Lat 18°12'17", long 65°45'31" Hydrologic unit 21010005. 1.9 mi (3.0 km) downstream from bridge on Hwy 31 and 0.7 mi (1.1 km) south of Hwy 31 and Hwy 970 intersec­ tion. 20.8 (53.9) 4/19/89 6/21/89 1345 1215 36.8 (1.04) 7.21 (0.20) 50077600 Quebrada Vaca below La Fe, PR Lat 18°12'25", long 65°45'04" Hydrologic unit 21010005. 1.1 mi (1.8 km) downstream from bridge on Hwy 31 and 0.8 mi (1.4 km) southeast of Hwy 31 and Hwy 970 intersec­ tion. 3.47 (8.99) 4/19/89 6/21/89 1430 1320 Ponded Ponded 50077700 Rio Blanco at mouth, PR Lat 18°11'17", long 65°43'47" Hydrologic unit 21010005.At bridge on Hwy 3, at mouth, and 0.8 mi (1.2 km) south- west of Hwy 3 and Hwy 192 intersection. 27.2 (70.4) 4/18/89 6/20/89 1215 1210 40.3 (1.14) Dry Rio Anton Ruiz basin 50078510 Rio Anton Ruiz at Pasto Viejo, PR Lat 18°10'26', long 65°47'05" Hydrologic unit 21010005.At bridge on unimproved road, 300 ft (91 m) north of Hwy 925, and 1.5 mi (2.4 km) north of Hwy 3 and Hwy 925 intersection. 5.75 (14.9) 4/18/89 6/19/89 1115 1210 2.72 (0.08) 3.34 (0.09) 50078700 Rio Anton Ruiz at mouth, PR Lat 18°10'35", long 65°44'23" Hydrologic unit 21010005. At bridge on Hwy 3, 1.8 mi (2.9 km) southwest of Hwy 3 and Hwy 192 intersection, and 200 ft (61 m) above mouth. 7.99 (20.7) 4/18/89 6/20/89 1200 1225 Ponded 25.3 (0.72) 321 DISCHARGE AT PARTIAL-RECORD STATIONS Low-flow partial-record stations--Continued STATION STATION LOCATION DRAINAGE STREAM- AREA FLOW NUMBER NAME AND mil DATE TIME cfs BASIN (km') (cms) Rio Humacao basin 50081000 Rio Humacao at Las Piedras, PR Lat 18°10'27", long 65°52'11" Hydrologic unit 21010005. On left bank about 60ft (18.3 m) off bridge on Hwy 921 (km 1.1), 0.6mi (1.0km) south -east of junction with Hwy 30, 0.8 mi (1.3 km) down­ stream from Quebrada Blanca, and 0.8mi (1.3km) south of Las Piedras. 6.65 (17.2) 4/18/89 6/20/89 1345 1450 12.3 (0.35) 10.7 (0.30) 50081500 Rio Humacao near Humacao, PR Lat 18°09'37", long 65°50'41" Hydrologic unit 21010005.At bridge on Hwy 914 and 1.3 mi (2.1 km) northwest of Humacao. 9.23 (23.9) 4/18/89 6/20/89 1440 1350 9.71 (0.27) 8.45 (0.24) 50081900 Quebrada Mariana at Patagonia, PR Lat 18'08'46", long 65°49'40" Hydrologic unit 21010005.At bridge on Hwy 908 and 450 ft (137 m) above junction with Rio Humacao. 5.76 (14.9) 4/18/89 6/20/89 1240 0725 6.28 (0.18) 7.11 (0.20) 50082500 Rio Humacao Flood Channel near mouth, PR Lat 18°07'28", long 65°47'23" Hydrologic unit 21010005. 3.1 mi (4.9 km) southeast of Plaza de Humacao and 0.6 mi (0.9 km) above mouth. 25.1 (65.0) 4/18/89 6/20/89 0930 1250 Ponded 18.8 (0.53) Rio Candelero basin 50082600 Rio Candelero at Hwy 906, PR Lat 18°06'17", long 65°48'54" Hydrologic unit 21010005.At bridge on Hwy 906, 1.4 mi (2.2 km) downstream from bridge on Hwy 3, and 1.7 mi (2.7 km) above mouth. 3.65 (9.45) 4/18/89 6/20/89 0730 1200 1.19 (0.03) 1.12 (0.03) 50082700 Rio Candelero at mouth, PR Lat 18°06'09". long 65°47'43" Hydrologic unit 21010005.At bridge on unimproved road, 1.3 mi (2.1 km) downstream from bridge on Hwy 906, and 0.4 mi (0.7 km) above mouth. 4.77 (12.4) 4/18/89 6/20/89 0850 1110 Ponded Ponded Rio Guayanes basin 50082800 Rio Guayanes near Colonia Laura, PR Lat 18°04'55", long 65°57'32" Hydrologic unit 21010005.0n left bank, 1000 ft (305 m) south of Hwy 182, 4.5 mi (7.2km) west of Colonia Laura, and 5.8 mi (9.3 km) north- northwest of Yabucoa. 4.69 (12.2) 4/17/89 6/19/89 0810 1010 16.9 (0.48) 10.2 (0.29) 50082810 Rio Guayanes below Rio Arenas, PR Lat 18°04'44", long 65°56'54" Hydrologic unit 21010005. 100 ft (30 m) below junction with Rio Arenas and 2.8 mi (4.6 km) above junction with Quebrada Guayabo. 7.44 (19.3) 4/17/89 6/19/89 1130 1100 24.8 (0.70) 18.4 (0.52) 50083400 Rio Guayanes at Calabazas, PR Lat 18°03'33", long 65°54'03" Hydrologic unit 21010005.At bridge on Hwy 182 and 1.4 mi (2.2 km) above junction with Rio Limones. 17.2 (44.5) 4/17/89 6/19/89 0950 1200 41.7 (1.18) 29.8 (0.84) 322 DISCHARGE AT PARTIAL-RECORD STATIONS Low-flow partial-record stations--Continued STATION STATION LOCATION DRAINAGE STREAM­ NUMBER NAME AND AREA mil DATE TIME FLOW cfs BASIN (km') (cms) Rio Guayanes basin 50084000 Rio Limones near Yabucoa, PR Lat 18°04'35", long 65°53'42" Hydrologic unit 21010005.At bridge on Hwy 904, 1.2 mi (2.0 km) upstream from Rio Guayanes, and 2.0 mi (3.2 km) northwest of Yabucoa. 7.89 (12.7) 4/17/89 6/19/89 1420 1330 13.8 (0.39) 15.2 (0.43) 50085000 Rio Guayanes at Yabucoa, PR Lat 18°03'42", long 65°52'33" Hydrologic unit 21010005.At bridge on Hwy 3, 0.5 mi (0.8 km) downstream from Rio Li­ mones, and 0.7 mi (1.1 km) north of Yabucoa. 26.5 (68.6) 4/17/89 6/19/89 1400 1245 Ponded 44.7 (1.27) 50085100 Rio Guayanes at Central Roig, PR Lat 18°03'57', long 65°52'22" Hydrologic unit 21010005. At abandonend lake control 26.6 (68.9) 4/17/89 1130 44.2 (1.25) structure, 0.2 mi (0.3 km) northeast of Central Roig, 1.0 mi (1.6 km) downstream from Rio Limones, and 1.0 mi (1.6 km) northeast of Yabucoa. 6/19/89 1510 39.1 (1.11) 50085700 Rio Guayanes near mouth near Playa de Guayanes, PR Lat 18°04'16", long 65°50'14" Hydrologic unit 21010005. At dirt road crossing, south of Hwy 906, and 3.1 mi (5.0 km) northeast of Yabucoa. 27.6 (71.5) 4/17/89 6/20/89 1500 0905 45.6 (1.29) 39.0 (1.10) 50086000 Rio del Inglinio near Yabucoa, PR Let 18°05'03", long 65°51'27" Hydrologic unit 21010005.At bridge on Hwy 3, 0.2 mi (0.3 km) upstream from Quebrada Cortadera and Aguacate, and 2.6 mi (4.2 km) northeast of Yabucoa. 2.46 (6.37) 4/17/89 6/19/89 1320 1610 2.55 (0.07) 2.57 (0.07) 50086300 Rio del Ingenio near Playa de Guayanes, PR Lat 18°04'20", long 65°50'02" Hydrologic unit 21010005. 1.8 mi (2.9 km) downstream from bridge on Hwy 3 and 0.6 mi (1.0 km) above junc­ tion with Rio Guayanes. 11.5 (29.8) 4/17/89 6/20/89 1600 1015 5.64 (0.16) 6.34 (0.18) 50086500 Rio Guayanes at Playa de Guayanes, PR Lat 18°03'45", long 65°49'42" Hydrologic unit 21010005. At old railroad crossing, 0.2 mi (0.3 km) from mouth, 0.4 mi (0.6km) west of Pla­ ya de Guayanes, and 3.5 mi (5.6 ka) northeast of Yabu­ 34.0 (88.1) 4/17/89 6/20/89 1730 0815 53.1 (1.50) 48.0 (1.36) coa. Carlo Santiago basin 50087100 Can() Santiago at Hwy 3, PR Lat 18°03'25", long 65°52'33" Hydrologic unit 21010005.At bridge on Hwy 3, 0.5 mi (0.8 km) north of Plaza de Yabucoa, and 0.3 mi (0.5 km) below junc­ tion with Quebrada Aguas Largas. 3.81 (9.87) 4/17/89 6/19/89 1300 1420 2.82 (0.08) 2.22 (0.06) 50087200 Cali° Santiago near Central Roig, PR Lat 18°03'18", long 65°50'59" Hydrologic unit 21010005. At service road and railroad bridge, 1.8 mi (2.9 km) east of Central Roig, and 2.0 mi (3.2 km) east of Yabucoa. 6.04 (15.6) 4/17/89 6/19/89 0900 1350 6.98 (0.20) 5.63 (0.16) I I 323 DISCHARGE AT PARTIAL-RECORD STATIONS Low-flow partial-record stations--Continued STATION NUMBER STATION NAME LOCATION AND BASIN DRAINAGE AREA mi' (km') DATE TIME STREAM- FLOW cfs (cms) Rio Maunabo basin 50091000 Rio Maunabo at Maunabo, PR Lat 18°00'24", long 65°54'19" Hydrologic unit 21010005. At bridge on Hwy 3, 0.4 mi (0.6 km) southwest of Mau­ nabo, and 1.3 mi (2.1 km) upstream fro mouth. 12.4 (32.1) 4/17/89 6/19/89 1510 1500 9.49 (0.27) 14.1 (0.40) Rio Jacaboa basin 50091500 Rio Jacaboa at Hacienda San Isidro, PR Lat 17°58'48", long 65°58'03" Hydrologic unit 21010004. At bridge on Hwy 3, 0.4 mi (0.6km) upstream fro mouth, 0.4 mi (0.6 km) east of Ha­ cienda San Isidro, and 4.8 mi (7.7 km) southwest of Maunabo. 5.23 (13.5) 4/18/89 6/19/89 1150 1550 1.22 (0.03) 0.42 (0.01) Rio Chico basin 50091800 Rio Chico at Providencia, PR Lat 17°59'16", long 66'00'18" Hydrologic unit 21010004. At flat low bridge 200 ft (61 m) south of Hwy 3, 0.5 mi (0.8 km) above mouth, and 1.5 mi (2.4 km) south- east of Patillas. 4.93 (12.8) 4/18/89 6/20/89 1050 1030 1.37 (0.04) Dry Rio Grande de Patillas basin 50091950 Rio Grande de Patillas below Quebrada Sonadora, PR Lat 18°03'48', long 66°02'57" Hydrologic unit 21010004. 1,300 ft (395 m) downstream from bridge on Hwy 184 and 1,000 ft (305 m) below junc­ tion with Quebrada Sonadora. 8.75 (22.7) 4/18/89 6/20/89 0910 0930 31.2 (0.88) 17.1 (0.48) 50094200 Rio Grande de Patillas at Patillas, PR Lat 18°00'15", long 66°01'27" Hydrologic unit 21010004. At bridge on Hwy 3, 0.7 mi (1.1 km) west of Patillas, and 1.9 mi (3.1km) upstream from mouth. 27.9 (72.3) 4/18/89 6/20/89 1000 1115 0.82 (0.02) 3.60 (0.10) 50094300 Rio Grande de Patillas at Providencia, PR Lat 17°59'20", long 66°00'47" Hydrologic unit 21010004. At abandoned railroad bridge, 0.5 mi (0.8 km) above mouth, and 0.6 mi (1.0 km) west of Providencia. 29.0 (75.1) 4/18/89 6/20/89 1240 1040 2.21 (0.06) 0.32 (0.01) Rio Nigua basin 50094500 Rio Nigua at Arroyo, PR Lat 17°58'10", long 66°03'41" Hydrologic unit 21010004. At bridge on Hwy 178, 0.2 mi (0.3 km)north of Arroyo, and 3.7 mi (6.0 km) east of Guayama. 8.04 (20.8) 4/18/89 6/20/89 1430 1220 Dry Dry Quebrada Salada basin 50094510 Quebrada Salada near Arroyo, PR Lat 17°58'50", long 66°04'23" Hydrologic unit 21010004. At bridge on Hwy 3 and 0.9 mi (1.4 km) upstream from mouth. 0.76 (1.97) 4/18/89 6/20/89 1350 1240 0.13 (0.004) 0.21 (0.005) Quebrada Corazon basin 50094520 Quebrada Corazon near Arroyo, PR Lat 17°58'58", long 66°04'41" Hydrologic unit 21010004.At bridge on Hwy 3 and 1.0 mi (1.6 km) above mouth. 4.29 (11.1) 4/18/89 6/20/89 1500 1300 0.11 (0.003) 0.63 I 324 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 fro 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 1989 Annual maximum Drainage Period Gage Dis- Station Station name Location area of Date height charge number mil record ft ft'is (km2 ) (m) (a'/s) Rio Salinas Basin 50100600 Quebrada Yeguas Lat 18°01'57", long 66°13'30", 2.66 1989 09/18/89 8.39 2.85 near Salinas, PR Hydrologic Unit 21010004, on (6.89) (2.557) (8.071) right bank, 350 ft (1.07 m) upstream bridge on Highway 712, 1.4 mi (2.2 km) southwest of La Plena, 1.6 mi (2.6 km) southeast Camp Santiago and 1.7 mi (2.7 km) northwest Guayana municipal limit. 325 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 1988 TO SEPTEMBER 1989 DEPTH OXYGEN. COLI- AT SPE- TRANS- 01S- FORM, SAMPLE CIFIC PAR- SOLVED FECAL. LOC- CON- PH TEMPER- ENCY OXYGEN, (PER- 0.7 ATION, DUCT- (STANO- ATURE (SECCHI 01S- CENT UM-MF DATE TIME TOTAL ANCE ARD WATER DISK) SOLVED SATUR- (COLS./ (FEET) (US/CM) UNITS) (DEG C) (IN) (MG/L) ATION) 100 ML) RIO GUAJATACA BASIN 50010720 LAGO GUAJATACA NO.3 NR MOUTH NR QUEBRAOILLAS,PR (LAT 18'22'05'N LONG 066'54 1 36'W) NOV 1988 04... 0830 1.00 260 8.10 28.2 71 9.1 111 K5, MAR 1989 08... 0820 1.00 300 1.60 24.7 20 7.9 96 K3 JUL 14... 0805 1.00 259 7.90 28.9 16 9.5 124 K1500 RIO GRANDE DE ARECIBO BASIN 50025110 LAGO DOS BOCAS NO.3 AT WEST BRANCH NR UTUADO,PR (LAT 18'19 1 15'N LONG 066'40'11°W) NOV 1988 21... 0955 1.00 204 7.70 26.9 60 8.4 105 69 MAR 1989 15... 0845 1.00 238 7.70 26.9 30 8.0 98 K350 JUL 12... 0910 1.00 214 7.80 28.9 34 7.5 97 240 RIO DE LA PLATA BASIN 50039900 LAGO CARITE NO.3 ON RIO DE LA PLATA MR CAYEY,PR (LAT 18*05'04'N LONG 066'06'03'W) NOV 1988 10... 0905 1.00 87 1.50 25.4 36 8.0 103 K12 MAR 1989 09... 0950 1.00 98 8.40 23.9 42 9.9 123 K14 JUL 11... 0915 1.00 103 7.70 26.6 64 8.6 108 42 50044400 LAGO LA PLATA NO.5 MR MOUTH NR NARANJITO. PR (LAT 18'19'33'N LONG 066'12'28'W) NOV 1988 09... 0905 1.00 252 8.00 27.5 12 8.6 108 148 MAR 14... 0830 1.00 336 7.80 24.6 24 9.1 108 K250 JUL 1989 6... 0830 1.00 380 7.20 27.7 29 2.0 25 54 RIO GRANDE OE LOIZA BASIN 50057500 LAGO LOIZA N0.4 NR MOUTH MR CAGUAS, PR (LAT 18'16'51'N LONG 066'00'35'W) NOV 1988 7... 1010 1.00 287 7.20 29.0 8 5.0 65 K20 MAR 1989 17... 1005 1.00 259 6.60 26.8 7 5.0 62 K100 JUL 06... 1040 1.00 175 7.00 26.8 5 4.8 60 K11000 K • non-ideal count ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATION 327 WATER-QUALITY BATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 STREP- ALKA- RESIDUE TOCOCCI UNITY TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- FECAL. WAT WH AT 105 GEN, GEM, GEN, GEN, GEM, KF AGAR TOT FET DEG. C. NITRATE NITRITE NO2,0403 AMMONIA ORGANIC (COLS. FIELD SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE PER MG/L AS PEMOED (MG/L (MG/L (MG/L (MG/L (MG/L 100 ML) CAC03 (MG/L) AS N) AS N) AS N) AS N) AS N) RIO GUAJATACA BASIN--CONTINUED 50010720 LAGO GUAJATACA N0.3 NR MOUTH NR QUEBRADILLAS.PR (LAT 18'22'054 LONG 066'54'36'W) NOV 1988 04... K12 120 6 <0.01 <0.10 <0.01 MAR 1989 08... 28 130 5 0.19 0.01 0.20 0.04 0.96 JUL 14... K600 120 6 0.19 0.01 0.20 0.03 0.37 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 1988 21... 29 77 0.68 0.02 0.70 0.04 0.56 MAR 1989 15... 180 80 3 0.38 0.02 0.40 0.06 0.34 JUL 12... 62 80 0.19 0.01 0.20 0.03 0.57 RIO DE LA PLATA BASIN--CONTINUED 50039900 LAGO CARITE NO.3 ON RIO DE LA PLATA NR CAYEY,PR (LAT 18"05 1 04"N LONG 066'06 1 03'W) NOV 1988 10... K5 29 6 <0.01 <0.10 0.02 0.28 MAR 1989 09... 35 29 6 <0.01 <0.10 0.01 0.49 JUL 11... 40 38 5 <0.01 <0.10 0.01 0.29 50044400 LAGO LA PLATA NO.5 NR MOUTH NR NARANJITO, PR (LAT 18'19'33'M LONG 066'12 1 28'W) NOV 1988 09... 58 95 9 0.78 0.02 0.80 0.02 0.28 MAR 14... 94 120 7 0.67 0.03 0.70 0.03 0.57 JUL 1989 6... K13 150 0.09 0.01 0.10 0.20 0.40 RIO GRANDE DE LOIZA BASIN--CONTINUED 50057500 LAGO LOIZA N0.4 NR MOUTH NR CAGUAS. PR (LAT 18'16'51'N LONG 066'00'35'W) NOV 1988 7... 104 98 21 0.61 0.09 0.70 0.87 0.33 MAR 1989 17... 240 82 42 0.52 0.08 0.60 0.84 0.36 JUL 06... K11000 52 0.42 0.08 0.50 0.49 0.71 328 ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATION WATER-QUALITY DATA. WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 NITRO- CHLOR-A CHLOR-8 GEN.AM- PHYTO- PHYTO- MONIA • NITRO- NITRO- PHOS- PLANK- PLANK- PLANK- PLANK- ORGANIC GEM. GEM. PHOROUS 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 NO3) AS P) (UG/L) (UG/L) (MG/L) (MG/L) RIO GUAJATACA BASIN--CONTINUED 50010720 LAGO GUAJATACA NO.3 MR MOUTH MR QUEBRAOILLAS.PR (LAT 18'22'05'N LONG 066'54 1 36'W) NOV 1988 04... 0.5 0.02 15.0 0.30 2.9 270 MAR 1989 08... 1.0 1.2 5.3 0.03 4.70 0.80 1.8 240 JUL 14... 0.4 0.6 2.7 0.02 12.0 0.40 5.7 260 RIO GRANOE DE ARECIBO BASIN--CONTINUED 50025110 LAGO DOS BOCAS NO.3 AT WEST BRANCH MR UTUAOO.PR (LAT 18'19'15'N LONG 066'40'11'W) NOV 1988 21... 0.6 1.3 5.8 0.05 11.0 0.30 3.2 260 MAR 1989 15... 0.4 0.8 3.5 0.04 7.30 0.40 3.0 250 JUL 12... 0.6 0.8 3.5 0.02 2.90 0.10 4.7 260 RIO DE LA PLATA BASIN--CONTINUED 50039900 LAGO CARITE NO.3 ON RIO DE LA PLATA NR CAYEY.PR (LAT 18'05'044 LONG 066'06'03'W) NOV 1988 10... 0.3 0.02 5.10 1.00 2.4 260 MAR 1989 09... 0.5 0.02 8.70 10.0 2.3 400 JUL 11... 0.3 0.02 5.40 0.30 1.7 250 50044400 LAGO LA PLATA NO.5 MR MOUTH MR KARANJITO, PR (LAT 18'19'33'N LONG 066'12'28"W) NOV 1988 09... 0.3 1.1 4.9 0.17 0.60 <0.10 1.9 260 MAR 14... 0.6 0.19 3.70 0.40 3.2 240 JUL 1989 6... 0.6 0.7 3.1 0.09 0.20 <0.10 4.9 260 RIO GRANDE DE LOIZA BASIN--CONTINUED 50057500 LAGO LOIZA NO.4 NR MOUTH MR CAGUAS. PR (LAT 18'16'51'N LONG 066'00'35"W) NOV 1988 7... 1.2 1.9 8.4 0.37 4.20 0.70 2.8 280 MAR 1989 17... 1.2 1.8 8.0 0.29 1.40 0.10 5.4 300 JUL 06... 1.2 1.7 7.5 0.23 8.80 0.40 7.0 280 329 ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATIONS WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 DEPTH OXYGEN. COLI- STREP- AT SPE- TRANS- DIS- FORM, TOCOCCI SAMPLE CIFIC PAR- SOLVED FECAL. FECAL. LOC- CON- PH TEMPER- ENCY OXYGEN. (PER- 0.7 KF AGAR ATION, DUCT- (STAND- ATURE (SECCHI 01S- CENT UM-MF (COLS. DATE TIME TOTAL ANCE ARD WATER DISK) SOLVED SATUR- (COLS./ PER (FEET) (US/CM) UNITS) (DEG C) (IN) (MG/L) ATION) 100 ML) 100 ML) RIO GUAJATACA BASIN--CONTINUED 50010790 LAGO GUAJATACA N0.1 MR DAM MR QUEBRAOILLAS,PR (LAT 18'23'56'N.LONG 066'55'23'W) NOV 1988 04... 0705 1.00 263 8.10 28.1 89 9.0 116 K7 K2 04... 0720 71.0 280 7.00 25.4 1.8 23 -- MAR 1989 08... 0910 1.00 276 7.80 25.4 52 9.6 118 K1 K10 08... 0915 50.0 300 7.40 24.5 -- 2.6 32 JUL 14... 0830 1.00 255 8.04 29.4 32 9.4 124 310 K31 14... 0835 53.0 324 7.11 26.5 -- 2.0 26 -- RIO GRANDE DE ARECIBO BASIN--CONTINUED 50020050 LAGO GARZAS NO.1 MR DAM NR AOJUNTAS,PR (LAT 18'08'21"N LONG 066'44'35'W) NOV 1988 03... 1100 1.00 121 6.90 24.3 52 8.5 110 42 K14 03... 1115 102.0 99 6.40 21.4 -- 1.9 25 -- -- MAR 1989 07... 1010 1.00 146 7.50 21.5 98 9.4 115 K3 K1 07... 1020 96.0 151 7.00 20.2 3.2 39 JUL 13... 1040 1.00 127 8.60 26.9 58 9.8 133 K3 K13 13... 1050 87.0 139 6.80 21.9 2.0 27 -- 50027090 LAGO DOS &OCAS NO.1 MR DAM MR UTUADO,PR (LAT 18"20 1 091 N LONG 066'40'04'W) NOV 1988 21... 0900 1.00 196 7.70 26.0 78 8.3 102 K17 100 21... 0905 75.0 204 6.90 25.3 -- 1.7 21 -- -- MAR 1989 15... 0930 1.00 222 7.70 25.7 84 8.7 106 K5 K1 15... 0915 74.0 198 7.00 25.0 -- 2.4 29 -- -- JUL 12... 0945 1.00 208 7.80 29.4 62 8.0 104 K14 K6 12... 0950 86.0 199 6.90 27.4 1.3 17 -- -- RIO OE LA PLATA BASIN--CONTINUED 50039950 LAGO CARITE NO.1 NR DAM NR CAYEY, P.R. (LAT 18'04'394 LONG 066'06'19'W) NOV 1988 10... 0935 1.00 87 7.90 25.1 38 8.8 106 K13 52 10... 0945 21.0 99 7.20 23.6 -- 6.9 83 -- -- MAR 1989 09... 1015 1.00 97 8.40 23.8 55 10.1 126 K10 K10 09... 1020 68.0 69 7.20 21.9 2.3 29 JUL 11... 0955 1.00 103 7.60 26.7 47 8.6 108 29 K13 11... 1005 64.0 180 6.60 22.1 -- 1.6 20 -- -- 50044950 LAGO LA PLATA NO.3 NR DAM NR KARANJITO. PR (LAT 18'20'18'N LONG 066'14'01'W) NOV 1988 09... 0935 1.00 275 8.00 27.87 31 9.0 114 K32 90 09... 0945 64.0 190 6.60 24.7 1.6 20 -- MAR 1989 14... 0910 1.00 254 7.60 24.7 55 6.8 81 K7 K170 14... 0930 58.0 147 6.90 22.4 -- 2.6 31 JUL 06... 0905 1.00 315 7.20 28.0 62 4.9 62 80 K18 06... 0910 47.0 200 6.60 22.3 0.9 11 -- RIO GRANGE DE LOIZA BASIN--CONTINUED 50058800 LAGO LOIZA NO.7 MR DAM MR TRUJILLO ALTO. PR (LAT 18"19.29"M LONG 066'00'47'W) NOV 1988 07... 0920 1.00 213 7.20 28.0 23 6.0 76 260 136 07... 0930 34.0 179 6.80 25.5 -- 1.8 23 -- -- MAR 1989 17... 0850 1.00 167 6.80 26.1 10 4.8 59 120 220 17... 0855 27.0 159 6.70 25.0 2.8 34 JUL 06... 0830 1.00 280 7.00 27.9 30 2.5 32 480 390 06... 0835 24.0 213 6.90 26.6 2.5 32 -- K • non-ideal count ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATIONS WATER-QUALITY DATA. WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 HARD- ALKA- HARD- NESS KAGNE- SODIUM POTAS- UNITY MESS NONCARB CALCIUM SIUM, SODIUM. AO- SLUM. WAT WH SULFATE TOTAL WH WIT DIS- DIS- DIS- SORP- DIS- TOT FET DIS- (MG/L TOT FLU SOLVED SOLVED SOLVED TION SOLVED FIELD SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS SO4) RIO GUAJATACA BASIN--CONTINUED 50010790 LAGO GUAJATACA NO.1 NR DAM NR QUEBRAOILLAS.PR (LAT 18'23'56'N LONG 066'55'23"W) NOV 1988 04... 140 7 52 3.3 4.6 0.2 1.9 120 10 04... 130 6 47 3.7 5.3 0.2 1.8 130 10 MAR 1989 08... 160 12 56 3.7 5.7 0.2 1.9 120 12 08... 140 6 49 3.7 5.9 0.2 1.8 140 11 JUL 14... 160 9 58 3.9 6.2 0.2 2.0 120 9.0 14... 130 7 46 3.8 6.0 0.2 1.8 120 13 RIO GRANDE DE ARECIBO BASIN--CONTINUED 50020050 LAGO GARZAS NO.1 MR DAM MR AOJUNTAS.PR (LAT 18'08'214 LONG 066'44'35'W) NOV 1988 03... 44 2 12 3.3 4.6 0.3 2.3 50 5.1 03... 51 0 14 3.8 5.2 0.3 1.6 43 4.2 MAR 1989 07... 67 0 19 4.7 6.0 0.3 1.4 59 4.5 07... 66 0 19 4.6 5.9 0.3 1.3 65 4.0 JUL 13... 61 0 17 4.5 4.8 0.3 1.7 77 <1.0 13... 60 0 17 4.2 6.0 0.3 1.1 64 4.0 50027090 LAGO DOS BOCAS NO.1 MR DAM NR UTUADO,PR (LAT 18'20'09'N LONG 066'40'04'W) NOV 1988 21... 80 3 21 6.7 9.6 0.5 2.4 74 16 21... 82 6 22 6.6 10 0.5 2.3 75 12 MAR 1989 15... 86 3 23 6.9 11 0.5 2.3 72 18 15... 78 2 21 6.3 9.9 0.5 2.5 70 15 JUL 12... 81 2 22 6.3 9.9 0.5 2.6 80 10 12... 84 23 6.5 11 0.5 2.4 80 15 RIO DE LA PLATA BASIN--CONTINUED 50039950 LAGO CARITE NO.1 NR DAM NR CAYEY. P.R. (LAT 18'04'39'N LONG 066'06'19'W) NOV 1988 10... 39 0 8.6 4.3 7.7 0.6 1.0 27 22 10... 26 0 4.9 3.4 1.8 0.7 0.7 30 5.9 MAR 1989 09... 32 0 6.6 3.7 8.0 0.6 0.8 19 3.4 09... 24 0 5.3 2.6 6.3 0.6 1.0 30 3.9 JUL 11... 31 0 6.5 3.6 8.6 0.7 0.9 38 <1.0 11... 32 0 6.4 4.0 9.9 0.8 0.7 44 3.0 50044950 LAGO LA PLATA NO.3 NR DAM NR KARANJITO. PR (LAT 18'20 1 18'N LONG 066'14'01"w) NOV 1988 09... 110 0 26 11 19 0.8 2.1 76 15 09... 74 0 18 7.0 10 0.5 2.6 110 14 MAR 1989 14... 53 6 13 5.1 8.9 0.5 2.4 89 13 14... 98 1 23 9.9 15 0.7 2.1 43 26 JUL 06... 74 5 18 7.0 11 0.6 4.0 140 3.0 06... 140 0 31 14 21 0.8 1.9 136 13 RIO GRANOE OE LOIZA BASIN--CONTINUED 50058800 LAGO LOIZA NO.7 MR DAM NR TRuJILLO ALTO. PR (LAT 18'19'29'N LONG 066'00'47"w) NOV 1988 07... 69 7 17 6.4 13 0.7 3.9 71 22 07... 73 0 17 7.4 16 0.8 2.9 63 15 MAR 1989 17... 52 1 13 4.8 12 0.7 2.6 50 16 17... 53 1 13 5.1 12 0.7 2.5 44 17 JUL 06... 78 3 19 7.5 20 1 3.5 98 14 06... 87 0 21 8.5 22 1 3.4 92 15 ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATIONS WATER-QUALITY DATA. WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 SOLIDS, RESIDUE CHLO- FLUO- SILICA. SUM OF TOTAL NITRO- NITRO- NITRO- NITRO- RIDE. RIDE. DIS- CONSTI- AT 105 GEN. GEN. GEN, GEN, CIS- 01S- SOLVED TUENTS. DEG. C. NITRATE NITRITE NO2+0103 AMMONIA SOLVED SOLVED (MG/L 01S- SUS- TOTAL TOTAL TOTAL TOTAL DATE (MG/L (MG/L AS SOLVED PENDED (MG/L (MG/L (MG/L (MG/L AS CL) AS F) SI02) (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 1988 04... 6.8 0.1 6.9 168 <1 <0.01 <0.10 <0.01 04... 7.6 0.1 7.2 159 -- MAR 1989 08... 8.1 0.1 8.4 182 4 <0.01 <0.10 0.01 08... 8.1 0.1 7.3 166 JUL 14... 9.9 0.1 8.6 189 <1 <0.01 <0.10 0.02 14... 10 0.1 6.7 158 -- -- -- RIO GRANDE DE ARECIBO BASIN--CONTINUED 50020050 LAGO GARZAS M0.1 NR DAN NR ADJUNTAS.PR (LAT 18'08'21'N LONG 066'44'35*W) NOV 1988 03... 4.4 0.1 13 71 6 <0.01 <0.10 <0.01 03... 4.8 0.1 16 82 -- MAR 1989 07... 5.4 0.1 20 102 2 <0.01 <0.10 <0.01 07... 5.1 0.1 19 100 JUL 13... 5.9 <0.1 15 84 1 <0.01 <0.10 0.02 13... 5.4 0.1 15 91 -- 50027090 LAGO DOS BOCAS NO.1 MR DAM NR UTUAOO,PR (LAT 18'20109'N LONG 066'40'04N) NOV 1988 21... 10 0.1 22 134 <1 0.59 0.01 0.60 0.02 21... 10 0.1 22 131 -- -- -- -- MAR 1989 15... 11 0.1 21 143 <1 0.01 <0.30 0.04 15... 10 0.1 20 131 JUL 12... 9.5 0.1 21 129 <1 <0.01 0.20 0.02 12... 10 0.1 21 137 -- RIO DE LA PLATA BASIN--CONTINUED 50039950 LAGO CARITE N0.1 NR DAM NR CAYEY. P.R. (LAT 18'041 39'N LONG 066'06 1 19'W) NOV 1988 10... 9.3 0.1 19 103 5 <0.01 <0.10 0.02 10... 8.3 0.1 15 64 MAR 1989 09... 8.1 0.1 17 69 3 <0.01 <0.10 <0.01 09... 7.3 0.1 13 53 JUL 11... 8.7 <0.1 17 84 1 <0.01 <0.10 0.01 11... 9.2 0.1 20 73 -- 50044950 LAGO LA PLATA N0.3 NR DAN NR NARANJITO, PR (LAT 18'20'184 LONG 066'14'01'W) NOV 1988 09... 10 0.1 17 142 2 0.16 0.04 0.20 0.01 09... 17 0.1 18 153 -- MAR 1989 14... 11 0.1 14 96 1 <0.01 0.20 0.01 14... 14 0.1 20 168 JUL 06... 12 0.1 17 113 4 <0.01 <0.10 <0.01 06... 21 0.1 21 205 -- RIO GRANDE OE LOIZA BASIN--CONTINUED 50058800 LAGO LOIZA N0.7 NR DAM NR TRUJILLO ALTO, PR (LAT 18'19'29'N LONG 066'00'47'W) NOV 1988 07... 12 0.1 18 130 7 0.57 0.03 0.60 0.02 07... 14 0.1 21 138 -- -- -- -- MAR 1989 17... 12 0.1 16 107 14 0.07 <0.50 0.16 17... 13 0.1 17 111 JUL 06... 17 0.1 23 149 6 0.12 0.08 0.20 0.62 06... 20 0.1 25 170 ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATIONS WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 NITRO- CHLOR-A CHLOR-B NITRO- GEN.AM- PHYTO- PHYTO- GEN. MONIA NITRO- NITRO- PHOS- PLANK- PLANK- PLANK- PLANK- ORGANIC ORGANIC GEN. GEM. PHOROUS TON TOM TOM TOM TOTAL TOTAL TOTAL TOTAL TOTAL CHROMO CHROMO 8IOMASS BIOMASS DATE (MG/L (MG/L (MG/L (MG/L (MG/L FLUOROM FLUOROM ASH WT DRY WT AS M) AS N) AS N) AS NO3) AS P) (UG/L) (UG/L) (MG/L) (MG/L) RIO GUAJATACA BASIN--CONTINUED 50010790 LAGO GUAJATACA N0.1 MR DAM MR QUEBRADILLAS.PR (LAT 18'23'56'N LONG 066'55'23"W) NOV 1988 04... 0.5 0.02 6.30 <0.10 3.3 260 04... -- MAR 1989 08... 0.89 0.9 0.01 1.50 0.20 2.0 250 08... JUL 14... 0.48 0.5 <0.01 7,80 0.20 2.5 260 14... -- RIO GRANDE DE ARECIBO BASIN--CONTINUED 50020050 LAGO GARZAS NO.1 MR DAM NR ADJUNTAS,PR (LAT 18'08'21"N LONG 066'44'35'W) NOV 1988 03... ..... 0.3 •- 0.01 4.80 0.40 4.0 260 03... -- MAR 1989 07... 0.5 0.01 3.80 2.20 1.4 230 07... -- -- JUL 13... 0.58 0.6 <0.01 4.60 0.40 2.4 250 13... -- -- -- 50027090 NOV 1988 LAGO DOS &OCAS NO.1 NR DAM MR UTUADO,PR (LAT 18'20 1 09'N LONG 066'40'04'W) 21... 0.48 0.5 1.1 4,9 0.06 5.90 0.30 1.3 250 21... -- -- MAR 1989 15... 0.26 0.3 0.02 4.40 0.40 2.6 250 15... -- -- -- -- JUL 12... 0.48 0.5 0.7 3.1 0.02 2.50 0.10 1.4 250 12... -- -- -- 50039950 NOV 1988 RIO OE LA PLATA BASIN--CONTINUED LAGO CARITE NO.1 NR GAM MR CAYEY. P.R. (LAT 18'04'394 LONG 066'06'19"W) 10... 0.28 0.3 0.02 6.10 1.30 2.2 260 10... -- -- MAR 1989 09... <0.2 0.01 6.90 8.60 2.1 400 09... -- -- -- -- JUL 11... 0.29 0.3 0.02 5.40 0.30 1.7 250 11... -- -- -- 50044950 NOV 1988 LAGO LA PLATA NO.3 MR DAM NR NARAMJITO. PR (LAT 18'20'18"M LONG 066"14'01'W) 09... 0.59 0.6 0.8 3.5 0.09 27.0 0.60 2.0 260 09... -- -- -- MAR 1989 14... 1.1 1.1 1.3 5.8 0.06 5.60 0.40 2.5 250 14... -- JUL 06... 0.4 0.02 5.00 0.80 2.4 250 6... -- RIO GRANDE OE LOIZA BASIN--CONTINUED 50058800 LAGO LOIZA NO.7 MR GAM NR TRUJILLO ALTO. PR (LAT 18'19'29'N LONG 066'00'47'W) NOV 1988 7... 0.48 0.5 1.1 4.9 0.14 9.10 0.30 2.3 270 07... .... -- -- MAR 1989 17... 0.64 0.8 0.14 2.70 0.20 2.6 230 17... -- -- -- JUL 06... 0.38 1.0 1.2 5.3 0.26 9.90 1.50 6.2 260 06... -- -- -- -- PESTICIDE ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATIONS WATER-QUALITY DATA, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 33 3 CHLOR- DI- DI- ENDO- PCB, ALDRIN, DANE, DOD, DDE, DDT, AZINON, ELDR1N SULFAN, DATE 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 50010790 LAGO GUAJATACA NO.1 NR DAM NR QUEBRADILLAS,PR (LAT 18°23'56"N LONG 066°55'23"W) JUL 14... 0830 <0.1 <0.01 <0.1 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 RIO GRANDE DE ARECIBO BASIN 50020050 LAGO GARZAS NO.1 NR DAM NR ADJUNTAS,PR (LAT 18°08'21"N LONG 066°44'35"W) JUL 13... 1040 <0.1 .0.01 <0.1 <0.01 .0.01 <0.01 <0.01 .0.01 <0.01 RIO DE LA PLATA BASIN 50027090 LAGO DOS BOCAS NO.1 NR DAM NR UTUADO,PR (LAT 18°20'09"N LONG 066°40 1 04"W) JUL 12... 0945 <0.1 <0.01 <0.1 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 50039950 LAGO CARITE NO.1 NR DAM NR CAYEY, P.R. (LAT 18°04 1 39"N LONG 066°06'19"W) JUL 11... 0955 <0.1 <0.01 <0.1 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 50044950 LAGO LA PLATA NO.3 NR DAM NR NARANJITO, PR (LAT 18°20'18"N LONG 066°14'01"W) JUL 06... 0910 <0.1 <0.01 <0.1 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 RIO GRANDE DE LOIZA BASIN 50058800 LAGO LOIZA NO.7 NR DAM NR TRUJILLO ALTO, PR (LAT 18°19'29"N LONG 066°00 1 47"W) JUL 06... 0830 <0.1 <0.01 <0.1 <0.01 <0.01 .0.01 0.06 <0.01 <0.01 334 PESTICIDE ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATIONS WATER-QUALITY DATA. WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 HEPTA- METH- METHYL METHYL HEPTA- CHLOR MALA- OXY- PARA- TRI- ENDRIN, ETHION, CHLOR, EPDXIDE LINDANE THION, CHLOR, THION, THION, MIREX, DATE 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 50010790 LAGO GUAJATACA NO.1 NR DAM NR QUEBRADILLAS,PR (LAT 18°23'56"N LONG 066°55 1 23"W) JUL 14... <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 RIO GRANDE DE ARECIBO BASIN--CONTINUED 50020050 LAGO GARZAS NO.1 NR DAM NR ADJUNTAS,PR (LAT 18°08'21"N LONG 066°44'35"W) JUL 13... <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 50027090 LAGO DOS BOCAS NO.1 NR DAM NR UTUADO,PR (LAT 18°20 1 09"N LONG 066°40 1 04"W) JUL 12... <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 RIO DE LA PLATA BASIN-CONTINUED 50039950 LAGO CARITE NO.1 NR DAM NR CAYEY, P.R. (LAT 18°04'39"N LONG 066°06'19"W) JUL 11... <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 50044950 LAGO LA PLATA NO.3 NR DAM NR NARANJITO, PR (LAT 18°20'18"N LONG 066°14'01"W) JUL 06... <0.01 <0.01 <0.01 <0.01 <0.01 <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, PR (LAT 18*19 1 294 LONG 066°00'47"W) JUL 06... <0.01 <0.01 <0.01 <0.01 <0.01 0.03 <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 1988 TO SEPTEMBER 1989 NAPH- THA- LENES, PARA- POLY- PER- TOX- TOTAL THION, CHLOR. THANE APHENE, TRI- 2,4-0, 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) RIO GUAJATACA BASIN--CONTINUED 50010790 LAGO GUAJATACA NO.1 NR DAM NR QUEBRADILLAS,PR (LAT 18°23'56"N LONG 066°55'23"W) JUL 14... <0.01 <0.1 <0.1 <1 <0.01 0.01 <0.01 <0.01 <0.01 RIO GRANDE DE ARECIBO BASIN--CONTINUED 50020050 LAGO GARZAS NO.1 NR DAM NR ADJUNTAS,PR (LAT 18°08'21"N LONG 066°44'35"W) JUL 13... <0.01 <0.1 <0.1 <1 <0.01 0.01 <0.01 <0.01 <0.01 50027090 LAGO DOS BOCAS NO.1 NR DAM NR UTUADO,PR (LAT 18'20 1 09"N LONG 06640'04"W) JUL 12... <0.01 <0.1 <0.1 <1 <0.01 0.01 <0.01 <0.01 <0.01 RIO OE LA PLATA BASIN--CONTINUED 50039950 LAGO CARITE NO.1 NR DAM NR CAYEY, P.R. (LAT 18°04'39"N LONG 066°06 1 19"W) JUL 11... <0.01 <0.1 <0.1 <1 <0.01 0.01 <0.01 <0.01 <0.01 50044950 LAGO LA PLATA NO.3 NR DAM NR NARANJITO, PR (LAT 18°20'18"N LONG 066°14'01"W) JUL 06... <0.01 <0.1 <0.1 <1 <0.01 0.01 <0.01 <0.01 <0.01 RIO GRANDE OE LOIZA BASIN--CONTINUED 50058800 LAGO LOIZA NO.7 NR DAM NR TRUJILLO ALTO, PR (LAT 18°19'29"N LONG 066°00 1 47"W) JUL 06... <0.01 <0.1 <0.1 <1 <0.01 0.08 <0.01 <0.01 <0.01 335 336 THIS PAGE WAS LEFT BLANK INTENTIONALLY 337 GROUND-WATER LEVELS 338 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.--Grilled 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, 40.18 ft (12.24 m) below land-surface datum, Sept. 18, 1989; 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 1988 TO SEPTEMBER 1989 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 44.08 43.70 43.30 43.06 42.92 42.72 42.30 42.09 41.81 41.49 41.14 40.74 2 44.07 43.74 43.23 43.00 42.93 42.64 42.33 42.09 41.79 41.50 41.12 40.71 3 44.08 43.77 43.24 42.99 42.94 42.64 42.30 42.07 41.80 41.48 41.02 40.66 4 44.05 43.72 43.24 42.98 42.94 42.67 42.29 42.03 41.79 41.45 40.99 40.65 5 44.02 43.67 43.25 43.02 42.96 42.66 42.25 42.05 41.81 41.50 41.02 40.61 6 44.02 43.65 43.27 43.09 42.95 42.58 42.23 42.05 41.81 41.52 41.00 40.57 7 44.05 43.65 43.24 43.09 42.95 42.56 42.23 42.00 41.79 41.45 41.03 40.60 8 44.00 43.64 43.25 43.01 42.95 42.59 42.20 41.97 41.78 41.40 40.99 40.63 9 44.00 43.60 43.23 43.02 42.91 42.58 42.24 41.97 41.76 41.38 41.02 40.63 10 43.99 43.59 43.21 43.09 42.89 42.46 42.24 42.02 41.77 41.44 41.00 40.64 11 43.98 43.56 43.22 43.04 42.88 42.43 42.21 42.00 41.77 41.40 40.96 40.65 12 44.00 43.52 43.17 43.04 42.86 42.47 42.17 41.93 41.77 41.38 40.95 40.68 13 43.98 43.51 43.13 43.04 42.88 42.51 42.15 41.98 41.77 41.35 40.97 40.65 14 43.91 43.47 43.19 43.04 42.88 42.52 42.13 41.97 41.76 41.36 40.98 40.66 15 43.83 43.45 43.23 43.03 42.81 42.49 42.14 42.03 41.74 41.39 40.96 40.69 40.67 16 43.85 43.44 43.19 43.01 42.77 42.47 42.17 42.01 41.72 41.34 40.93 17 43.86 43.44 43.13 42.99 42.80 42.47 42.19 42.01 41.72 41.29 40.91 40.60 18 43.84 43.43 43.14 42.97 42.76 42.45 42.11 41.97 41.66 41.29 40.87 40.25 19 43.79 43.42 43.21 42.94 42.79 42.41 42.14 41.95 41.62 41.29 40.86 40.54 20 43.79 43.43 43.20 42.87 42.82 42.41 42.10 41.93 41.63 41.24 40.87 40.59 21 43.82 43.37 43.12 42.85 42.83 42.40 42.06 41.92 41.61 41.28 40.82 40.59 22 43.78 43.39 43.12 42.90 42.77 42.41 42.06 41.94 41.56 41.29 40.84 40.59 23 43.80 43.31 43.09 42.90 42.72 42.42 42.10 41.93 41.55 41.26 40.82 40.62 24 43.78 43.26 43.09 43.00 42.71 42.44 42.10 41.90 41.54 41.20 40.82 40.62 25 43.74 43.33 43.11 42.98 42.66 42.42 42.09 41.89 41.57 41.20 40.81 40.57 26 43.70 43.35 43.11 42.99 42.66 42.41 42.07 41.87 41.54 41.23 40.80 40.52 27 43.72 43.38 43.12 42.90 42.70 42.41 42.04 41.86 41.53 41.21 40.82 40.51 28 43.71 43.34 43.11 42.89 42.72 42.39 42.03 41.84 41.55 41.20 40.82 40.50 29 43.66 43.31 43.14 42.92 42.36 42.09 41.83 41.57 41.21 40.75 40.57 30 43.61 43.31 43.12 42.91 42.32 42.11 41.83 41.55 41.19 40.74 40.59 31 43.65 43.09 42.88 42.30 41.80 41.20 40.76 LOW 44.08 43.77 43.30 43.09 42.96 42.72 42.33 42.09 41.81 41.52 41.14 40.74 HIGH 43.61 43.26 43.09 42.85 42.66 42.30 42.03 41.80 41.53 41.19 40.74 40.25 WTR YR 1989 MEAN 42.29 LOW 44.80 HIGH 40.25 35 < 14 C3 ta AtLi= 45 S La w -J Z La < i- 55 ONDJ FMAMJJ ASONDJ FMAMJ J ASONDJ FMAMJ J AS 1986 1987 1988 1989 GROUND-WATER LEVELS 339 RIO GUAJATACA BASIN 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 1988 TO- SEPTEMBER 1989 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 3 426.84 426.58 425.89 427.89 430.00 431.85 433.50 434.72 436.03 437.55 437.84 438.56 4 426.85 426.43 425.94 427.96 430.07 431.91 433.54 434.75 436.09 437.81 437.89 438.57 5 426.85 426.33 425.99 428.06 430.14 431.98 433.55 434.79 436.14 437.88 437.96 438.57 6 426.88 426.24 426.10 428.14 430.21 432.02 433.58 434.82 436.18 437.94 438.01 438.58 7 426.90 426.14 426.13 428.20 430.28 432.08 433.59 434.84 436.04 437.97 438.09 438.62 8 426.91 426.04 426.20 428.26 430.36 432.16 433.61 434.87 436.10 438.03 438.13 438.65 9 426.96 425.95 426.25 428.34 430.42 432.16 433.66 434.91 436.14 438.08 438.19 438.69 10 426.99 425.87 426.30 428.42 430.49 432.18 433.69 434.93 436.19 438.14 438.25 438.74 11 427.02 425.81 426.35 428.46 430.55 432.24 433.70 434.96 436.45 438.17 438.29 438.76 12 427.06 425.76 426.40 428.54 430.63 432.34 433.74 434.98 436.52 438.00 438.37 438.79 13 427.06 425.71 426.44 428.60 430.70 432.39 433.77 435.02 436.59 438.04 438.41 438.80 14 427.04 425.67 426.53 428.67 430.79 432.43 433.80 435.04 436.44 438.06 438.45 438.83 15 426.99 425.63 426.61 428.75 430.81 432.49 433.84 435.09 436.49 438.05 438.50 438.86 16 426.98 425.61 426.66 428.80 430.90 432.54 433.90 435.12 436.55 438.00 438.54 438.89 17 426.97 425.59 426.70 428.87 430.97 432.60 433.96 435.15 436.81 438.15 438.60 438.92 18 426.96 425.58 426.79 428.94 431.01 432.64 433.97 435.17 436.87 438.11 438.61 438.80 19 426.95 425.57 426.88 429.00 431.10 432.68 434.01 435.22 436.94 438.05 438.63 439.03 20 426.95 425.57 426.94 429.03 431.17 432.76 434.07 435.27 437.01 437.99 438.64 439.03 21 426.97 425.56 426.98 429.10 431.24 432.82 434.11 435.31 437.05 437.96 438.65 439.04 22 426.98 425.58 427.06 429.17 431.29 432.88 434.15 435.35 437.10 437.90 438.70 439.07 23 427.00 425.56 427.13 429.24 431.35 432.92 434.20 435.41 437.17 437.83 438.68 439.11 24 427.00 425.55 427.20 429.31 431.43 432.98 434.25 435.45 437.02 437.78 438.70 439.11 25 426.99 425.61 427.28 429.36 431.49 433.02 434.30 435.51 437.08 437.74 438.71 439.15 26 426.96 425.66 427.33 429.46 431.59 433.07 434.35 435.56 437.13 437.72 438.72 439.06 27 426.97 425.70 427.41 429.48 431.65 433.14 434.41 435.61 437.19 437.69 438.74 438.97 28 426.94 425.71 427.49 429.57 431.70 433.18 434.47 435.66 437.44 437.69 438.73 438.86 29 426.91 425.75 427.57 429.66 433.25 434.54 435.72 437.53 437.69 438.68 438.80 30 426.85 425.78 427.62 429.72 433.29 434.59 435.79 437.58 437.72 438.65 438.72 31 426.81 427.69 429.78 433.35 435.83 437.76 438.63 LOW 427.06 426.76 427.69 429.78 431.70 433.35 434.59 435.83 437.58 438.17 438.74 439.15 HIGH 426.81 425.55 425.80 427.76 429.87 431.76 433.39 434.64 435.91 437.42 437.77 438.56 WTR YR 1989 MEAN 432.71 LOW 439.15 HIGH 425.55 91 400 W 4 ci ,. wwo 420 zit( laJ vi 440 az !i 460 ONDJ FMAMJJ ASONDJ FMAMJJ ASONDJ FMAMJ J AS 1986 1987 1988 1989 . 340 GROUND-WATER LEVELS RIO GRANDE DE ARECIBO BASIN 182737066370900. Local number, 204. LOCATION.--Lat 18°27'37", long 66°37'09". Owner: Sucesion 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, May 14, 1986; lowest water level recorded, 52.39 ft (15.9 m) below land-surface datum, Mar. 28, 1989. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 51.90 51.66 51.74 51.89 52.11 52.21 52.19 52.19 52.25 52.24 52.01 2 51.91 51.67 51.78 51.91 52.12 52.17 52.19 52.20 52.21 52.22 52.01 3 51.92 51.67 51.78 51.92 52.17 52.17 52.20 52.23 52.18 52.13 52.02 4 51.93 51.70 51.75 51.91 52.21 52.15 52.18 52.23 52.17 52.04 52.02 5 51.91 51.66 51.74 51.93 52.22 - 52.14 52.19 52.22 52.17 52.02 52.03 6 51.89 51.61 51.73 51.94 52.23 52.13 52.18 52.23 52.20 52.05 52.03 7 51.85 51.61 51.74 51.94 52.21 52.14 52.20 52.22 52.18 52.08 52.03 8 51.81 51.65 51.77 51.95 52.21 52.17 52.19 52.21 52.17 52.10 52.03 9 51.79 51.67 51.78 51.97 52.20 52.19 52.18 52.22 52.16 52.15 52.07 10 51.76 51.67 51.81 52.00 --- 52.24 52.18 52.23 52.17 52.16 52.08 11 51.72 51.67 51.81 52.02 52.25 52.17 52.24 52.18 52.15 52.00 12 51.71 51.66 51.83 52.02 --- 52.22 52.19 52.24 52.20 52.15 51.94 13 51.76 51.68 51.83 52.01 52.11 52.17 52.16 52.23 52.23 52.16 51.89 14 51.79 51.66 51.84 52.03 52.17 52.16 52.20 52.24 52.25 52.13 51.84 15 51.82 51.67 51.87 52.02 52.22 52.11 52.22 52.25 52.25 52.10 51.78 16 51.83 51.65 51.87 52.05 52.22 52.10 52.22 52.26 52.27 52.07 51.77 17 51.86 51.63 51.81 52.05 52.22 52.10 52.21 52.28 52.25 52.03 51.78 18 51.88 51.61 51.80 52.08 52.22 52.09 52.21 52.27 52.23 51.98 51.70 19 51.87 51.58 51.81 52.09 52.18 52.07 52.22 52.26 52.18 51.96 51.64 20 51.86 51.56 51.82 52.10 52.12 52.05 52.22 52.25 52.13 51.99 51.65 21 51.82 51.57 51.86 52.09 52.11 52.03 52.20 52.22 52.10 52.01 51.76 22 51.79 51.57 51.86 52.07 52.13 52.00 52.21 52.20 52.08 52.04 51.84 23 51.76 51.b0 51.84 52.09 52.17 52.00 52.20 52.18 52.10 52.09 51.91 24 51.73 51.63 51.86 52.08 52.21 52.02 52.20 52.17 52.14 52.18 51.91 25 51.73 51.64 51.87 52.08 52.25 52.07 52.18 52.17 52.18 52.21 51.92 26 51.74 51.68 51.89 52.08 52.27 52.14 52.16 52.16 52.22 52.22 51.90 27 51.77 51.73 51.89 52.11 52.27 52.16 52.17 52.16 52.24 52.19 51.87 28 51.83 51.79 51.92 52.11 52.29 52.15 52.17 52.19 52.26 52.16 51.84 29 51.85 51.81 51.94 52.12 52.29 52.16 52.17 52.24 52.27 52.13 51.82 30 51.79 51.76 51.93 52.15 52.29 52.18 52.17 52.24 52.24 52.06 51.85 31 51.70 --- 51.92 52.14 52.26 --- 52.17 --- 52.23 52.04 --- LOW 51.93 51.81 51.94 52.15 52.25 52.22 52.28 52.27 52.24 52.08 HIGH 51.70 51.56 51.73 51.89 52.00 52.16 52.16 52.08 51.96 51.64 50 1-4(o 51 La La w k ZA VV4). IA- 52 l‘ti rdk > la CZI 53 -1 Z <J 54 ONDJ FM AMJJ ASONDJ FMAMJJ ASONDJ FMAMJ J AS 1986 1987 1988 1989 GROUND-WATER LEVELS RIO GRANDE 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 ell. 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 recorded, 16.02 ft (4.88 m) below land-surface datum, Sept. 6-12,15, 1989. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 10.61 11.53 10.71 10.19 10.53 10.65 11.18 11.65 12.99 13.41 14.89 15.96 2 10.63 11.51 10.68 10.13 10.53 10.66 11.20 11.74 13.01 13.19 15.12 15.88 3 10.87 11.45 10.60 10.16 10.50 10.68 11.20 11.77 13.00 13.44 14.91 15.85 4 10.89 11.22 10.59 10.17 10.46 10.65 11.22 11.78 12.97 13.41 15.13 15.89 5 10.91 11.24 10.68 10.31 10.32 10.67 11.23 11.82 13.00 13.49 15.15 16.00 6 10.99 11.24 10.68 10.29 10.33 10.69 11.22 11.73 13.04 13.52 15.15 16.02 7 10.92 11.34 10.55 10.19 10.47 10.76 11.23 12.04 13.05 13.51 15.22 16.02 8 10.83 11.25 10.55 10.21 10.51 10.80 11.20 12.51 13.10 13.48 15.24 16.02 9 10.85 11.32 10.52 10.25 10.49 10.80 11.19 12.62 13.11 13.50 15.25 16.02 10 10.75 11.50 10.47 10.31 10.54 10.76 11.23 12.61 13.08 13.52 15.29 16.02 11 10.83 11.35 10.42 10.35 10.50 10.68 11.26 12.55 13.04 13.55 15.19 16.02 12 10.78 11.30 10.43 10.36 10.39 10.70 11.33 12.51 13.06 13.52 15.44 16.01 13 10.83 11.30 10.48 10.50 10.49 10.79 11.13 12.45 13.11 14.15 15.58 15.97 14 10.84 11.26 10.48 10.43 10.51 10.81 11.17 12.64 13.14 14.40 15.58 15.97 15 10.68 11.12 10.51 10.31 10.49 10.82 11.21 12.77 13.13 14.19 15.60 16.02 16 10.70 11.07 10.49 10.19 10.48 10.94 11.12 12.81 13.16 14.18 15.59 15.98 17 10.87 11.07 10.45 10.31 10.55 10.97 11.37 12.89 13.14 14.48 15.61 15.86 18 10.93 10.90 10.44 10.33 10.50 10.94 11.20 12.92 13.12 14.52 15.59 15.28 19 10.94 10.92 10.55 10.45 10.49 10.94 11.39 12.91 13.14 14.45 15.55 15.43 20 10.98 10.74 10.45 10.31 10.59 11.02 11.18 12.79 13.16 14.53 15.57 15.58 21 11.01 10.73 10.37 10.30 10.67 11.06 11.39 12.69 13.11 14.67 15.63 15.58 22 10.96 10.71 10.36 10.30 10.67 11.10 11.46 12.81 13.11 14.64 15.68 15.67 23 10.98 10.73 10.40 10.30 10.58 11.12 11.44 12.92 13.14 14.63 15.68 15.79 24 11.02 10.76 10.29 10.30 10.69 11.07 11.48 12.87 13.04 14.67 15.84 15.78 25 11.06 10.72 10.26 10.30 10.67 11.06 11.58 12.91 13.06 14.68 15.82 15.80 26 11.89 10.70 10.21 10.35 10.66 11.07 11.55 12.94 13.11 14.74 15.78 15.79 27 11.90 10.69 10.27 10.32 10.66 11.13 11.69 12.87 13.18 14.77 15.81 15.67 28 11.89 10.69 10.29 10.30 10.65 11.16 11.69 12.88 13.41 14.79 15.88 15.68 29 11.85 10.70 10.29 10.30 11.21 11.65 12.94 13.42 14.77 15.88 15.89 30 11.75 10.72 10.26 10.34 11.27 11.56 12.98 13.48 14.77 15.89 15.87 31 11.68 10.26 10.50 11.27 12.96 14.83 15.91 LOW 11.90 11.53 10.71 10.50 10.69 11.27 11.69 12.98 13.48 14.83 15.91 16.02 HIGH 10.61 10.69 10.21 10.13 10.32 10.65 11.12 11.65 12.97 13.19 14.89 15.28 WTR YR 1989 MEAN 12.24 LOW 16.02 HIGH 10.31 6 m W cig Lu-c La ow 10 zat. j - o 14 WI I,J4( < 18 J FM AMJ J ASONDJ F MAMJJ ASONDJ FMAMJJ AS 1986 1987 1988 1989 342 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 Limestone. 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, 5.72 ft (1.76 m) below land-surface datum, Oct. 8-9, 1986. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 5.23 4.37 4.96 4.67 5.36 5.39 5.44 5.41 5.40 5.49 5.50 2 5.24 4.50 5.01 4.84 5.36 5.40 5.38 5.41 5.41 5.45 5.50 3 5.24 4.67 5.03 4.97 5.41 5.41 5.37 5.42 5.44 5.43 5.42 4 5.21 4.83 5.00 5.05 5.45 5.41 5.36 5.41 5.46 5.43 5.33 5 5.17 4.87 4.99 5.17 5.48 5.42 5.36 5.41 5.45 5.43 5.31 6 5.14 4.83 4.99 5.19 5.49 5.41 5.35 5.41 5.47 5.47 5.35 7 5.08 4.84 5.02 5.19 5.47 5.41 5.38 5.43 5.46 5.46 5.37 8 5.06 4.88 5.06 5.11 5.45 5.38 5.40 5.41 5.45 5.43 5.38 9 5.05 4.91 5.08 5.07 5.44 5.38 5.43 5.41 5.46 5.42 5.42 10 4.50 4.94 5.11 5.00 5.39 5.34 5.47 5.41 5.47 5.43 5.43 11 4.50 4.94 5.10 4.35 5.40 5.34 5.48 5.39 5.48 5.44 12 4.68 4.94 5.10 4.20 5.42 5.33 5.42 5.41 5.47 5.46 13 4.87 4.95 5.10 4.31 5.42 5.33 5.37 5.39 5.46 5.47 14 4.96 4.91 5.11 4.45 5.44 5.37 5.35 5.41 5.47 5.49 15 5.02 4.91 5.12 4.53 5.43 5.41 5.33 5.43 5.48 5.50 16 5.06 4.89 5.12 4.65 5.27 5.43 5.31 5.43 5.49 5.52 17 5,08 4.71 5.07 4.76 5.23 5.42 5.31 5.42 5.52 5.52 18 5.11 4.62 5.03 4.92 5.26 5.43 5.30 5.42 5.53 5.49 19 5.10 4.69 5.04 5.08 5.36 5.41 5.29 5.43 5.51 5.46 20 5.09 4.71 5.06 4.99 5.40 5.36 5.28 5.45 5.50 5.41 21 5.06 4.73 5.09 5.04 5.40 5.35 5.25 5.42 5.48 5.39 22 5.04 4.62 5.10 5.15 5.41 5.37 5.23 5.43 5.46 5.38 23 5.00 4.21 5.08 5.23 5.43 5.39 5.22 5.43 5.44 5.39 24 4.98 4.41 4.61 5.28 5.41 5.42 5.24 5.43 5.43 5.42 25 4.98 4.54 4.36 5.30 5.40 5.46 5.30 5.43 5.43 5.43 26 4.98 4.69 4.47 5.32 5,37 5.49 5.35 5.40 5.41 5.47 27 5.01 4.80 4.33 5.35 5.32 5.50 5.38 5.41 5.41 5.48 28 5.05 4.93 4.49 5.35 5.33 5.53 5.38 5.41 5.42 5.51 29 5.09 5.01 4.41 5.36 --- 5.54 5.39 5.40 5.46 5.52 30 4.42 4.99 4.45 5.38 5.52 5.40 5.40 5.49 5.50 31 4.15 --- 4.57 5.38 5.49 --- 5.39 --- 5.49 LOW 5.24 5.01 5.12 5.38 5.49 5.54 5.48 5.45 5.53 5.52 HIGH 4.15 4.21 4.33 4.20 5.23 5.33 5.22 5.39 5.40 5.38 0 3 W 4 W G ▪ow 4 zie6 J - LA ,„ 5 )\\,, ezz (tAi W :5 < 6 ONDJ FMAMJJ ASONDJ FM A MJ J ASON DJ FMAMJ J AS 1986 1987 1988 1989 343 GROUND-WATER LEVELS RIO GRANDE DE MANATI BASIN 182710066303700. Local number, 207. LOCATION.--Lat 18°27'10", long 66°30'37". Owner: P.R. Aqueduct and Sewer Authority. Name: Cantito La Luisa. AQUIFER.--Aymamon Limestone. 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 1988 TO SEPTEMBER 1989 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 38.72 38.54 38.59 38.83 38.95 39.08 39.21 39.24 39.36 39.42 39.44 39.36 2 38.71 38.52 38.61 38.84 38.97 39.06 39.18 39.25 39.37 39.42 39.45 39.36 3 38.72 38.51 38.63 38.85 39.02 39.05 39.15 39.25 39.37 39.41 39.43 39.35 4 38.73 38.49 38.63 38.86 39.05 39.06 39.14 39.26 39.39 39.42 39.36 39.35 5 38.74 38.50 38.65 38.88 39.11 39.07 39.14 39.27 39.39 39.42 39.33 39.34 6 38.74 38.49 38.67 38.87 39.13 39.08 39.14 39.29 39.41 39.43 39.32 39.32 7 38.75 38.55 38.66 38.84 39.14 39.08 39.14 39.31 39.42 39.43 39.32 39.29 8 38.75 38.58 38.69 38.84 39.14 39.08 39.15 39.32 39.43 39.41 39.33 39.24 9 38.76 38.60 38.71 38.85 39.15 39.08 39.17 39.32 39.44 39.39 39.36 39.22 10 38.71 38.64 38.74 38.87 39.14 39.07 39.19 39.33 39.45 39.39 39.38 39.21 11 38.69 38.67 38.75 38.88 39.13 39.07 39.21 39.32 39.45 39.38 39.37 39.16 12 38.68 38.69 38.77 38.86 39.14 39.07 39.21 39.33 39.43 39.38 39.37 39.14 13 38.69 38.70 38.78 38.85 39.14 38.99 39.21 39.32 39.42 39.39 39.36 39.11 14 38.70 38.72 38.79 38.84 39.16 39.00 39.21 39.33 39.42 39.41 39.35 39.11 15 38.71 38.73 38.81 38.84 39.16 39.03 39.20 39.34 39.43 39.41 39.35 39.09 16. 38.72 38.72 38.81 38.84 39.14 39.05 39.20 39.35 39.44 39.43 39.36 39.09 17 38.70 38.69 38.77 38.85 39.14 39.08 39.20 39.35 39.46 39.43 39.36 39.09 18 38.71 38.65 38.74 38.86 39.14 39.11 39.19 39.35 39.47 39.43 39.33 39.06 19 38.70 38.63 38.75 38.88 39.14 39.12 39.18 39.35 39.46 39.42 39.31 38.76 20 38.70 38.61 38.77 38.90 39.14 39.12 39.18 39.37 39.46 39.41 39.30 38.71 21 38.69 38.63 38.80 38.90 39.14 39.12 39.17 39.36 39.45 39.40 39.30 38.70 22 38.69 38.65 38.84 38.91 39.15 39.13 39.15 39.36 39.44 39.39 39.30 38.71 23 38.67 38.62 38.84 38.93 39.16 39.14 39.14 39.36 39.43 39.38 39.33 38.73 24 38.66 38.61 38.84 38.93 39.17 39.15 39.15 39.37 39.42 39.37 39.35 38.75 25 38.66 38.59 38.83 38.92 39.17 39.17 39.17 39.38 39.41 39.38 39.38 38.76 26 38.67 38.59 38.84 38.91 39.17 39.19 39.19 39.38 39.40 39.39 39.39 38.79 27 38.68 38.59 38.84 38.91 39.14 39.20 39.21 39.38 39.38 39.40 39.40 38.80 28 38.70 38.58 38.84 38.91 39.09 39.21 39.21 39.38 39.38 39.41 39.39 38.82 29 38.71 38.60 38.85 38.91 39.22 39.22 39.37 39.40 39.43 39.40 38.83 30 38.69 38.59 38.84 38.94 39.22 39.24 39.37 39.41 39.43 39.38 38.85 31 38.58 38.83 38.95 39.22 39.36 39.43 39.38 LOW 38.76 38.73 38.85 38.95 39.17 39.22 39.24 39.38 39.47 39.43 39.45 39.36 HIGH 38.58 38.49 38.59 38.83 38.95 38.99 39.14 39.24 39.36 39.37 39.30 38.70 WTR YR 1989 MEAN 39.08 LOW 39.74 HIGH 38.49 36 37 38 39 40 ONDJ FMAMJJ ASONDJ FMAMJJ AS ONDJ FMAMJJ AS 1986 1987 1988 1989 344 GROUND-WATER LEVELS RIO GRANDE DE MANATI BASIN 182308066260400. Local number, 210. LOCATION.--Let 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, 70.23 ft (21.4 m) below land-surface datum, Sept. 11,15, 1989. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG ' SEP 1 59.29 63.94 60.58 62.28 62.61 61.05 63.54 65.90 66.82 67.47 68.68 69.65 2 59.62 63.79 60.60 62.30 62.63 59.75 63.68 65.93 66.85 67.50 68.69 69.70 3 59.96 63.63 60.63 62.32 62.64 59.39 63.78 65.95 66.86 67.58 68.71 69.76 4 60.32 63.50 60.64 62.35 62.65 59.56 63.90 65.97 66.85 67.83 68.75 69.81 5 60.69 63.44 60.68 62.40 62.66 59.83 64.01 66.01 66.83 67.88 68.78 69.86 6 61.03 63.41 60.73 62.44 62.66 60.14 64.11 66.03 66.83 67.93 68.81 69.93 7 61.31 63.38 60.92 62.47 62.67 60.55 64.23 66.03 66.85 67.96 68.84 70.00 8 61.48 63.31 61.01 62.51 62.68 60.95 64.32 66.02 66.87 67.98 68.87 70.08 9 61.69 63.17 61.09 62.52 62.70 61.28 64.43 66.02 66.88 68.01 68.90 70.15 10 61.84 63.11 61.01 62.55 62.73 61.52 64.54 66.03 66.92 68.04 68.94 70.20 11 61.93 62.94 61.09 62.57 62.79 61.78 64.59 66.05 66.94 68.08 68.95 70.23 12 62.02 62.85 61.19 62.58 62.85 61.95 64.65 66.07 66.99 68.12 68.98 70.21 13 62.11 62.81 61.29 62.57 62.97 62.04 64.70 66.09 66.99 68.14 69.01 70.21 14 62.18 62.78 61.41 62.52 63.11 62.10 64.77 66.11 67.00 68.16 69.03 70.21 15 62.23 62.71 61.49 62.42 63.22 62.15 64.86 66.14 67.00 68.19 69.05 70.22 16 62.29 62.65 61.53 62.36 63.35 62.19 64.94 66.17 67.12 68.22 69.08 70.18 17 62.36 62.60 61.62 62.31 63.34 62.23 65.02 66.18 67.15 68.23 69.12 70.14 18 62.44 62.56 61.67 62.30 63.14 62.25 65.09 66.22 67.16 68.25 69.14 69.99 19 62.50 62.53 61.71 62.30 62.89 62.29 65.17 66.25 67.17 68.28 69.17 69.71 20 62.57 62.50 61.78 62.31 62.79 62.30 65.25 66.29 67.19 68.31 69.21 69.72 21 62.63 62.46 61.82 62.34 62.74 62.34 65.34 66.32 67.01 68.35 69.24 69.72 22 62.75 62.44 61.91 62.38 62.71 62.41 65.44 66.34 67.03 68.40 69.28 69.72 23 63.03 62.36 61.99 62,39 62.71 62.46 65.50 66.41 67.05 68.42 69.31 69.72 24 63.34 62.27 62.08 62.42 62.72 62.50 65.61 66.45 67.10 68.48 69.34 69.72 25 63.55 62.05 62.15 62.44 62.77 62.53 65.66 66.48 67.12 68.51 69.39 69.72 26 63.73 61.61 62.20 62.48 62.83 62.56 65.68 66.50 67.14 68.54 69.42 69.72 27 63.85 61.20 62.24 62.50 62.82 62.60 65.77 66.52 67.46 68.57 69.47 69.72 28 63.92 60.89 62.28 62.52 62.43 62,65 65.82 66.52 67.50 68.60 69.49 69.72 29 64.01 60.70 62.28 b2.55 62.76 65.85 66.67 67.58 68.63 69.52 69.72 30 64.07 60.61 62.28 62.57 62.94 65.88 66.69 67.43 68.65 69.56 69.72 31 64.05 62.28 62.59 63.30 66.79 68.65 69.59 LOW 64.07 63.94 62.28 62.59 63.35 63.30 65.88 66.79 67.58 68.65 69.59 70.23 HIGH 59.29 60.61 60.58 62.28 62.43 59.39 63.54 65.90 66.82 67.47 68.68 69.65 WTR YR 1989 MEAN 64.89 LOW 70.23 HIGH 59.29 0 20 W wc) Law 40 c.) zts 60 >N 3 80 ONDJFMAMJJ ASONDJFMAMJJ ASONDJFMAMJJ AS 1986 1987 1988 1989 GROUND-WATER LEVELS 345 RIO CIBUCO BASIN 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 at). 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 1988 TO SEPTEMBER 1989 INSTANMTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 26.75 27.04 27.15 27.41 27.46 27.51 27.91 28.21 28.64 28.83 28.86 28.20 2 26.76 27.04 27.17 27.40 27.48 27.50 27.90 28.28 28.62 28.84 28.86 28.18 3 26.78 27.05 27.19 27.41 27.50 27.49 27.90 28.29 28.61 28.85 28.85 28.17 4 26.80 27.07 27.21 27.42 27.51 27.50 27.90 28.30 28.59 28.87 28.83 28.16 5 26.81 27.08 27.23 27.44 27.53 27.52 27.90 28.31 28.58 28.89 28.81 28.15 6 26.82 27.09 27.26 27.46 27.54 27.53 27.91 28.32 28.58 28.91 28.80 28.16 7 26.84 27.10 27.28 27.49 27.56 27.54 27.92 28.33 28.58 28.91 28.80 28.17 8 26.84 27.12 27.30 27.49 27.57 27.55 27.94 28.33 28.59 28.91 28.80 28.18 9 26.86 27.13 27.32 27.51 27.60 27.57 27.95 28.34 28.60 28.91 28.81 28.20 10 26.83 27.15 27.31 27.51 27.63 27.57 27.97 28.35 28.62 28.92 28.82 28.21 11 26.82 27.16 27.32 27.49 27.62 27.59 27.99 28.37 28.62 28.93 28.82 28.24 12 26.83 27.17 27.34 27.42 27.64 27.60 28.01 28.39 28.61 28.93 28.83 28.24 13 26.84 27.17 27.35 27.35 27.67 27.62 28.02 28.40 28.61 28.94 28.83 28.24 14 26.85 27.19 27.37 27.32 27.69 27.64 28.03 28.41 28.63 28.95 28.83 28.24 15 26.87 27.20 27.40 27.30 27.69 27.65 28.04 28.42 28.64 28.97 28.84 28.24 16 26.88 27.20 27.42 27.28 27.69 27.67 28.06 28.43 28.66 28.98 28.85 28.25 17 26.89 27.18 27.44 27.28 27.69 27.68 28.07 28.45 28.67 28.99 28.75 28.24 18 26.91 27.16 27.46 27.28 27.64 27.71 28.08 28.47 28.68 29.00 28.67 28.15 19 26.92 27.13 27.48 27.29 27.59 27.71 28.09 28.48 28.69 29.01 28.60 27.98 20 26.93 27.12 27.50 27.29 27.56 27.73 28.10 28.50 28.70 29.00 28.53 27.81 21 26.94 27.11 27.51 27.29 27.54 27.74 28.11 28.52 28.71 29.01 28.49 27.68 22 26.95 27.10 27.52 27.28 27.54 27.75 28.12 28.53 28.72 29.01 28.45 27.58 23 26.97 27.09 27.53 27.29 27.55 27.77 28.14 28.55 28.73 29.01 28.44 27.53 24 26.98 27.08 27.54 27.29 27.56 27.79 28.15 28.57 28.74 29.01 28.42 27.48 25 26.98 27.08 27.51 27.31 27.57 27.80 28.17 28.58 28.75 29.01 28.41 27.42 26 26.99 27.09 27.48 27.32 27.57 27.82 28.19 28.60 28.76 28.96 28.39 27.39 27 27.01 27.10 27.46 27.35 27.57 27.84 28.21 28.61 28.76 28.93 28.38 27.38 28 27.02 27.10 27.45 27.37 27.53 27.86 28.23 28.62 28.78 28.89 28.38 27.37 29 27.04 27.12 27.44 27.37 27.87 28.25 28.63 28.80 28.87 28.32 27.36 30 27.04 27.14 27.42 27.41 27.89 28.26 28.64 28.82 28.86 28.28 27.37 31 27.04 27.42 27.42 27.91 28.64 28.86 28.24 LOW 27.04 27.20 27.54 27.51 27.69 27.91 28.26 28.64 28.82 29.01 28.86 28.25 HIGH 26.75 27.04 27.15 27.28 27.46 27.49 27.90 28.27 28.58 28.83 28.24 27.36 WTR YR 1989 MEAN 27.89 LOW 29.01 HIGH 26.75 9 20 IA­ IAJ o W Lau 24 Z cc. w tn 28 WI -1 Ci Z LAJ < 32 ONDJFMAMJJ ASONDJFMAMJJ ASONDJFIAAMJ AS 1986 1987 1988 1989 346 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. AQUIFER.--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 OF RECORD.--October 1985 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 191.29 ft (58.30 m) below land-surface datum, May 16, 1986; lowest water level recorded, 193.22 ft (58.89 m) below land-surface datum, Aug.. 11-18, 1989. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 192.33 192.25 192.33 192.56 192.66 192.54 192.88 193.02 193.14 193.05 193.16 193.19 2 192.33 192.25 192.34 192.56 192.67 192.54 192.85 193.02 193.14 193.06 193.17 193.19 3 192.33 192.25 192.36 192.56 192.71 192.53 192.85 193.02 193.13 193.05 193.18 193.19 4 192.32 192.25 192.39 192.56 192.74 192.54 192.84 193.03 193.13 193.05 193.19 193.19 5 192.32 192.25 192.40 192.56 192.77 192.56 192.84 193.03 193.13 193.04 193.20 193.19 6 192.32 192.24 192.41 192.57 192.77 192.57 192.84 193.04 193.13 193.04 193.19 7 192.32 192.25 192.43 192.57 192.78 192.58 192.85 193.04 193.15 193.03 193.18 8 192.32 192.27 192.44 192.57 192.79 192.58 192.85 193.04 193.15 193.03 193.18 9 192.32 192.29 192.46 192.57 192.79 192.59 192.86 193.04 193.15 193.02 193.19 10 192.32 192.31 192.48 192.57 192.79 192.59 192.87 193.05 193.17 193.02 193.20 11 192.31 192.33 192.48 192.57 192.79 192.59 192.90 193.05 193.16 193.01 193.22 12 192.31 192.34 192.49 192.57 192.80 192.61 192.94 193.06 193.15 193.01 193.22 13 192.31 192.34 192.50 192.57 192.80 192.60 192.94 193.06 193.15 193.00 193.22 14 192.31 192.34 192.50 192.55 192.80 192.62 192.94 193.06 193.14 193.00 193.22 15 192.31 192.34 192.51 192.54 192.81 192.65 192.94 193.07 193.14 192.99 193.22 16 192.31 192.34 192.52 192.54 192.81 192.68 192.94 193.09 193.13 193.01 193.22 193.04 17 192.31 192.34 192.52 192.54 192.81 192.68 192.94 193.09 193.13 193.02 193.22 193.02 18 192.30 192.34 192.52 192.54 192.81 192.69 192.94 193.09 193.12 193.06 193.22 193.01 19 192.30 192.34 192.52 192.54 192.82 192.70 192.94 193.11 193.12 193.06 193.21 192.80 20 192.30 192.34 192.52 192.54 192.82 192.70 192.94 193.13 193.11 193.06 193.20 192.72 21 192.30 192.34 192.53 192.54 192.82 192.70 192.93 193.13 193.11 193.07 193.19 192.72 22 192.30 192.34 192.55 192.55 192.83 192.71 192.92 193.13 193.10 193.08 193.19 192.72 23 192.30 192.32 192.55 192.55 192.83 192.74 192.91 193.13 193.10 193.09 193.19 192.72 24 192.30 192.31 192.55 192.55 192.83 192.76 192.91 193.14 193.09 193.10 193.19 192.72 25 192.29 192.31 192.55 192.55 192.84 192.78 192.92 193.15 193.09 193.10 193.19 192.72 26 192.29 192.31 192.55 192.55 192.84 192.81 192.94 193.15 193.08 193.11 193.19 192.72 27 192.29 192.31 192.55 192.55 192.69 192.83 192.96 193.15 193.08 193.12 193.19 192.72 28 192.29 192.31 192.55 192.55 192.55 192.85 193.02 193.15 193.07 193.13 193.19 192.72 29 192.29 192.33 192.55 192.56 192.89 193.02 193.15 193.07 193.14 193.19 192.73 30 192.29 192.33 192.55 192.59 192.90 193.02 193.15 193.06 193.15 193.19 192.73 31 192.28 192.55 192.63 192.90 193.14 193.16 193.19 LOW 192.33 192.34 192.55 192.63 192.84 192.90 193.02 193.15 193.17 193.16 193.22 HIGH 192.28 192.24 192.33 192,54 192.55 192.53 192.84 193.02 193.06 192.99 193.16 3 c) 190 La m CO IA Uj LU U 2t i L6t 192 ). tn Lu -J et :1E 't -J 4( 194 r ONDJFMAMJJASONDJFMAMJJASONDJFMAMJJAS 1986 1987 1988 1989 347 GROUND-WATER LEVELS RIO CIBUCO BASIN 182515066194000. Local number, 212. LOCATION.--kat 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 1988 TO SEPTEMBER 1989 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 65.52 65.61 65.82 66.52 66.60 66.68 67.18 68.03 68.83 69.33 69.61 68.66 2 65.54 65.59 65.83 66.51 66.61 66.62 67.21 68.06 68.83 69.35 69.58 68.72 3 65.58 65.59 65.86 66.51 66.64 66.58 67.24 68.08 68.84 69.37 69.56 68.68 4 65.61 65.59 65.87 66.69 66.67 66.57 67.26 68.10 68.84 69.39 69.53 68.66 5 65.63 65.59 65.90 66.85 66.70 66.56 67.29 68.12 68.85 69.42 69.50 68.63 6 65.65 65.60 65.93 66.98 66.74 66.54 67,31 68.15 68.85 69.44 69.48 68.62 7 65.67 65.60 65.96 67.10 66.76 66.54 67.33 68.17 68.86 69.46 69.47 68.60 8 65.68 65.61 65.99 67.21 66.78 66.55 67.34 68.19 68.87 69.46 69.47 68.49 9 65.71 65.62 66.03 67.30 66.81 66.58 67.36 68.21 68.89 69.49 69.47 68.57 10 65.72 65.64 66.06 67.38 66.83 66.58 67.39 68.23 68.90 69.50 69.47 68.58 11 65.71 65.66 66.08 67.32 66.86 66.57 67.41 68.27 68.90 69.52 69.52 68.56 12 65.63 65.67 66.12 67.21 66.88 66.60 67.44 68.30 68.91 69.54 69.49 68.57 13 65.56 65.70 66.16 67.10 66.91 66.63 67.47 68.32 68.92 69.56 69.48 68.58 14 65.57 65.72 66.21 66.99 66.94 66.66 67.51 68.34 68.94 69.59 69.46 68.58 15 65.56 65.75 66.25 66.90 66.96 66.69 67.53 -68.37 68.95 69.61 69.46 68.53 16 65.59 65.77 66.27 66.85 66.99 66.71 67.56 68.41 68.98 69.63 69.45 68.47 17 65.64 65.79 66.31 66.79 67.01 66.74 67.59 68.43 69.00 69.65 69.42 68.43 18 65.68 65.80 66.35 66.74 67.00 66.77 67.61 68.45 69.02 69.67 69.39 68.27 19 65.72 65.80 66.39 66.70 66.97 66.79 67.64 68.49 69.04 69.73 69.33 68.14 20 65.77 65.80 66.43 66.66 66.97 66.82 67.67 68.52 69.08 69.72 69.28 67.94 21 65.81 65.80 66.47 66.63 66.95 66.85 67.70 68.53 69.10 69.72 69.23 67.79 22 65.86 65.80 66.51 66.59 66.95 66.90 67.74 68.57 69.12 69.74 69.19 67.69 23 65.91 65.79 66.55 66.55 66.95 66.92 67.77 68.61 69.14 69.74 69.15 67.59 24 65.94 65.78 66.57 66.52 66.95 66.94 67.79 68.62 69.16 69.74 69.11 67.49 25 65.88 65.78 66.58 66.51 66.95 66.96 67.83 68.66 69.18 69.74 69.07 67.40 26 65.80 65.78 66.57 66.50 66.96 67.00 67.86 68.68 69.20 69.74 69.03 67.33 27 65.73 65.79 66.56 66.49 66.86 67.03 67.90 68.69 69.22 69.73 68.99 67.27 28 65.70 65.79 66.55 66.49 66.74 67.06 67.95 68.73 69.24 69.70 68.96 67.20 29 65.67 65.80 66.54 66.50 67.09 67.98 68.75 69.27 69.67 68.94 67.17 30 65.64 65.81 66.54 66.51 67.12 68.01 68.78 69.29 69.64 68.88 67.14 31 65.62 66.52 66.63 67.15 68.81 69.63 68.82 MAX 65.94 65.81 66.58 67.38 67.01 67.15 68.01 68.81 69.29 69.74 69.61 68.72 MIN 65.52 65.59 65.82 66.49 66.60 66.54 67.18 68.03 68.83 69.33 68.82 67.14 WTR YR 1989 MEAN 67.51 LOW 69.74 HIGH 65.52 60 Lai m1.. 4.1 LaJ w 'iv Z 4C Li- 70 > z < 80 ONDJFMAMJJ ASONDJFMAA4jJ ASONDJFMAMJJ AS 1986 1987 1988 1989 348 GROUND-WATER LEVELS RIO CIBUCO 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, 49.94 ft (15.2 m) below land-surface datum, July 27, 1989. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 38.76 40.15 41.93 42.53 42.19 42.23 42.41 43.74 45.27 47.25 49.08 47.97 2 38.76 40.59 41.65 42.56 42.27 42.05 42.47 43.79 45.33 47.44 49.05 48.00 3 38.79 40.48 41.71 42.57 42.30 42.01 42.51 43.83 45.38 47.13 48.96 48.50 4 38.83 40.67 41.96 42.61 42.38 41.99 42.54 43.87 45.40 47.04 48.90 48.57 5 38.86 40.62 42.09 42.69 42.44 41.94 42.57 43.95 45.45 47.07 48.87 48.56 6 38.94 40.85 42.22 42.73 42.50 41.89 42.59 44.01 45.48 47.58 48.81 48.57 7 39.00 40.89 42.16 42.75 42.55 41.89 42.60 44.03 45.49 47.80 48.79 48.65 8 39.03 40.78 42.14 42.75 42.62 41.88 42.62 44.05 45.52 47.97 48.76 48.75 9 39.10 40.91 42.22 42.79 42.66 41.84 42.69 44.10 45.56 48.17 48.76 48.89 10 39.17 40.78 42.20 42.80 42.70 41.77 42.72 44.12 45.59 48.34 48.76 48.98 11 39.26 40.76 42.35 42.78 42.73 41,71 42.73 44,19 45.63 48.46 48.73 48.97 12 39.30 40.70 42.57 42.63 43.03 41.14 42.75 44.21 45.67 48.53 48.75 48.95 13 39.33 40.89 42.03 42.42 43.46 41.78 42.77 44.30 45.71 48.61 48.70 48.24 14 39.37 40.81 41.99 42.27 43.31 41.79 42.81 44.35 45.75 48.73 48.65 47.89 15 39.07 40.64 41.99 42.17 42.98 41.79 42.87 44.43 45.78 48.90 48.58 47.59 16 39.37 40.86 41.96 42.09 43.00 41.80 42.97 44.47 45.83 48.97 48.52 47.32 17 39.48 40.98 41.97 42.04 43.01 41.83 43.02 44.53 45.89 49.08 48.49 47.24 18 39.57 41.06 42.00 42.03 42.85 41.84 43.01 44.57 45.91 49.14 48.65 46.28 19 39.62 41.16 42.09 42.00 42.78 41.84 43.03 44.60 45.94 49.24 48.43 45.90 20 39.71 41.26 42.11 41.95 42.75 41.89 43.07 44.65 46.00 49.30 48.35 45.32 21 39.84 41.30 42.12 41.94 42.73 41.93 43.10 44.70 46.04 49.46 48.25 45.44 22 39.92 41.39 42.17 41.97 42.70 41.97 43.19 44.77 46.06 49.52 48.21 45.36 23 40.04 41.31 42.20 41.96 42.64 42.03 43.28 44.81 46.12 49.60 48.17 45.30 24 40.10 41.23 42.26 41.94 42.64 42.11 43.34 44.85 46.17 49.65 48.12 45.10 25 39.80 41.52 42.32 41.93 42.60 42.14 43.38 44.89 46.23 49.75 48.08 44.99 26 39.62 41.63 42.35 41.97 42.58 42.17 43.41 44,93 46.26 49.88 48.04 44.76 27 40.06 41.71 42.41 41.96 42.52 42.23 43.45 44.99 46.31 49.93 48.04 44.64 28 40.20 41.75 42.44 41.98 42.36 42.25 43.51 45.04 46.40 49.41 48.04 44.50 29 40.03 41.81 42.50 42.04 42.28 43.61 45.08 46.65 49.29 47.99 44.44 30 40.01 41.87 42.52 42.07 42.31 43.68 45.15 47.08 49.21 47.97 44.43 31 40.32 42.53 42.11 42.35 45.20 49.18 47.98 LOW 40.32 41.87 42.57 42.80 43.46 42.35 43.68 45.20 47.08 49.93 49.08 48.98 HIGH 38.76 40.15 41.65 41.93 42.19 41.71 42.41 43.74 45.27 47.04 47.97 44.43 WTR YR 1989 MEAN 43.93 LOW 49.93 HIGH 38.76 0 25 $-▪‹ W 35 w 45 > 1/J I Z LaJ < • 55 ONDJ FMAMJJ ASONDJ FMAMJ J ASONDJ FM AMJ J AS 1986 1987 1988 1989 349 GROUND-WATER LEVELS RIO DE LA PLATA BASIN 182746066170800. Local number, 214. LOCATION.--Lat 18°27'46", long 66°17'08". Owner: Dorado Beach Hotel. Name: Dorado Beach No. 7. AQUIFER.--Aymamon Limestone. WELL CHARACTERISTICS.--trilled 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 OF RECORD.-- November 1985 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 18.23 ft (5.56 m) below land-surface datum, Nov. 16, 1985; lowest water level recorded, 20.31 ft (6.19 m) below land-surface datum, Mar. 8, 1987. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 19.14 19.44 19.59 19.58 19.75 19.88 19.96 20.07 20.02 2 19.20 19.47 19.58 19.58 19.71 19.88 19.87 20.03 20.02 3 19.21 19.48 19.62 19.58 19.71 19.89 19.85 20.01 19.91 4 19.18 19.47 19.68 19.62 19.71 19.88 19.84 20.01 19.78 5 19.18 19.51 19.70 19.62 19.71 19.88 19.83 20.02 19.83 6 19.25 19.49 19.71 19.59 19.72 19.88 19.87 20.06 19.91 7 19.27 --- 19.50 19.69 19.61 19.74 19.88 19.85 20.02 19.94 8 19.27 19.32 19.52 19.69 19.60 19.77 19.87 19.86 20.01 19.96 9 19.20 19.33 19.58 19.71 19.62 19.79 19.86 19.91 20.00 20.01 10 19.15 19.33 19.62 19.68 19.58 19.81 19.87 19.94 20.05 20.01 11 --- 19.34 --- 19.63 19.66 19.60 19.83 19.86 19.95 20.04 20.02 12 19.17 19.34 19.52 19.55 19.68 19.60 19.81 19.91 19.93 20.06 20.03 13 19.28 19.38 19.53 19.49 19.67 19.60 19.77 19.88 19.94 20.07 20.05 --- 14 19.33 19.44 19.58 19.48 19.69 19.64 19.77 19.93 19.97 20.12 20.05 19.60 15 19.41 19.47 19.60 19.43 19.59 19.67 19.76 19.96 19.98 20.12 20.03 19.56 16 19.23 19.40 19.57 19.47 19.59 19.69 19.76 19.96 19.99 20.15 20.01 19.57 17 19.26 19.33 19.51 19.45 19.64 19.68 19.77 19.95 20.02 20.11 19.86 19.57 18 19.31 19.21 19.47 19.49 19.38 19.68 19.77 19.97 20.03 20.09 19.65 18.91 19 19.22 19.18 19.49 19.52 19.44 19.65 19.77 19.98 19.97 20.01 19.62 18.95 20 19.22 19.15 19.49 19.50 19.51 19.63 19.78 20.00 19.98 19.98 19.61 19.10 21 19.25 19.17 19.52 19.49 19.54 19.65 19.78 19.95 19.95 19.98 19.60 19.27 22 19.38 19.15 19.53 19.48 19.55 19.68 19.76 19.99 19.94 20.01 19.63 19.42 23 19.24 19.52 19.51 19.61 19.72 19.78 19.99 19.92 20.04 19.65 19.51 24 19.37 19.57 19.51 19.60 19.77 19.81 20.00 19.94 20.03 19.70 19.29 25 19.40 19.57 19.52 19.61 19.81 19.86 19.98 19.99 20.08 19.74 19.28 26 19.36 - 19.56 19.55 19.58 19.82 19.90 19.96 19.98 20.06 19.77 19.35 27 19.41 - 19.56 19.56 19.52 19.83 19.91 19.97 19.99 20.02 19.77 19.30 28 19.42 19.56 19.55 19.55 19.84 19.91 19.98 20.04 20.04 19.79 19.31 29 19.42 19.58 19.59 --- 19.83 19.92 19.98 20.11 20.03 19.73 19.35 30 --- 19.52 19.60 19.81 19.89 19.98 20.11 20.01 19.57 19.41 31 19.50 19.60 19.78 --- 19.95 --- 20.03 19.61 --- LOW 19.63 19.71 19.84 19.92 20.00 20.11 20.15 20.05 HIGH 19.43 19.38 19.58 19.71 19.86 19.83 19.98 19.57 of 18 La m < 18.5 W o w w 19 Mitt In 19.5 > \NA\mwv, -ICI CV 20 ctz La< 20.5 ONDJ FMAMJJ ASONDJ FMAMJJ ASONDJ FMAMJ J AS 1986 1987 1988 1989 350 GROUND-WATER LEVELS RIO DE LA PLATA BASIN 182530066135400. Local number, 216. LOCATION.--Lat 18'25'30", long 66°13'54". Owner: P.R. Aqueduct and Sewer Authority. Name: Pozo Navy-Campanillas. AQUIFER.--Aguada Limestone. WELL CHARACTERISTICS.--Drilled unused water-tablh 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. RFMARKS.--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 1988 TO SEPTEMBER 1989 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 10.50 10.70 11.72 12.00 12.94 12.07 12.81 13.17 13.63 13.59 12.67 11.26 2 10.43 10.75 11.69 12.10 12.95 12.10 12.75 13.16 13.32 13.59 12.66 11.32 3 10.47 10.80 11.60 12.07 12.94 12.14 12.73 13.14 13.19 13.58 12.45 11.33 4 10.46 10.85 11.59 12.09 12.95 12.18 12.74 13.14 13.10 13.57 12.44 11.35 5 10.45 10.88 11.61 12.17 13.01 12.21 12.76 13.13 12.99 13.60 12.47 11.33 6 10.49 10.90 11.66 12.19 13.04 12.21 12.80 13.09 12.99 13.62 12.49 11.30 7 10.51 10.93 11.66 12.19 13.06 12.23 12.83 13.04 12.99 13.63 12.48 11.38 8 10.51 10.95 11.68 12.23 12.90 12.25 12.87 12.98 13.01 13.60 12.52 11.37 9 10.53 10.97 11.81 12.27 12.86 12.26 12.94 12.98 13.06 13,61 12.57 11.53 10 10.54 11.01 11.93 12.30 12.64 12.25 12.94 13.41 13.08 13.64 12.60 11.58 11 10.59 11.04 11.98 12.08 12.62 12.26 12.94 13.47 13.02 13.65 12.57 11.49 12 10.63 11.03 12.03 12.08 12.65 12.29 12.96 13.51 12.98 13.60 12.59 11.50 13 10.66 11.05 12.08 12.00 12.65 12.28 12.76 13.55 13.00 13.59 12.62 11.51 14 10.70 11.08 12.13 11.99 12.66 12.29 12.72 13.58 13.03 13.61 12.61 11.53 15 10.71 11.09 12.18 11.99 12.61 12.32 12.69 13.61 13.07 13.65 12.62 11.54 16 10.73 11.10 12.21 12.02 12.56 12.35 12.71 13.65 13.22 13.67 12.59 11.57 17 10.75 11.04 12.22 11.85 12.48 12.51 12.72 13.67 13.22 13.68 12.02 11.57 18 10.78 10.91 12.11 11.87 12.19 12.29 12.78 13.55 13.17 13.67 11.93 10.42 19 10.80 10.93 12.16 12.45 12.14 12.55 13.25 13.64 13.19 13.46 11.85 9.83 20 10.80 10.97 12.25 12.51 12.07 12.65 13.43 13.64 13.25 13.44 11.75 9.73 21 10.64 10.99 12.31 12.24 12.09 12.47 13.50 13.74 13.29 13.46 11.74 9.71 22 10.61 11.24 12.36 12.53 12.10 12.55 13.50 13.78 13.31 13.48 11.76 9.73 23 10.60 11.27 12.38 12.54 12.12 12.67 13.16 13.82 13.33 13.47 11.78 9.77 24 10.60 11.34 12.37 12.63 12.14 12.75 13.14 13.84 13.33 13.42 11.68 10.13 25 10.63 11.54 12.29 12.50 12.16 12.80 13.20 13.86 13.34 13.44 11.68 10.32 26 10.66 11.47 12.28 12.74 12.19 12.82 13.23 13.87 13.35 12.97 11.68 10.51 27 10.70 11.51 12.24 12.78 12.06 12.85 13.26 13.86 13.45 12.92 11.68 10.10 28 10.73 11.56 12.25 12.81 12.04 12.85 13.28 13.86 13.54 12.84 11.67 10.49 29 10.75 11.63 12.21 12.86 12.88 13.29 13.84 13.62 12.82 11.52 10.67 30 10.67 11.68 12.01 13.02 12.88 13.23 13.85 13.57 12.81 11.37 10.86 31 10.68 11.93 12.95 12.88 13.74 12.76 11.27 LOW 10.80 11.68 12.38 13.02 13.06 12.88 13.50 13.87 13.63 13.68 12.67 11.58 HIGH 10.43 10.70 11.59 11.85 12.04 12.07 12.69 12.98 12.98 12.76 11.27 9.71 WTR YR 1989 MEAN 12.27 LOW 13.87 HIGH 9.71 ONDJ FMAMJ J ASONDJ FMAMJ J ASONDJ FMAMJ J AS 1986 1987 1988 1989 351 GROUND-WATER LEVELS RIO DE LA PLATA BASIN 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, 1.92 ft (0.58 m) below land-surface datum, Apr. 12, 1986. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 .58 1.10 1.37 1.47 1.45 1.61 1.45 .66 2 .56 1.12 1.32 1.46 1.22 1.60 1.46 .72 3 .60 1.16 1.32 1.48 1.19 1.57 1.39 .75 4 .57 1.19 1.35 1.49 1.18 1.57 1.26 .77 5 .50 1.20 1.35 1.51 1.18 1.59 1.28 .83 6 .52 1.08 1.19 1.38 1.51 1.19 1.63 1.36 .87 7 .53 1.06 1.17 1.38 1.47 1.20 1.62 1.40 .89 8 .52 1.07 --- 1.17 1.36 1.43 1.22 1.55 1.42 .90 9 .51 1.11 1.35 1.17 1.39 1.44 1.31 1.55 1.46 .92 10 .51 1.10 1.13 1.31 1.15 1.41 1.51 1.36 1.58 1.47 .98 11 .51 .86 1.11 1.11 1.26 1.15 1.42 1.53 1.28 1.59 1.46 .90 12 .61 .86 1.12 1.02 1.30 1.15 1.42 1.54 1.25 1.55 1.48 .90 13 .66 .88 1.13 .87 1.31 1.14 1.37 1.56 1.28 1.58 1.51 .90 14 .69 .92 1.15 .88 1.34 1.18 1.36 1.59 1.34 1.59 1.50 .91 15 .69 .92 1.16 .88 1.26 1.22 1.34 1.62 1.37 1.63 1.49 .91 16 .71 .87 1.15 .92 1.21 1.25 1.34 1.64 1.41 1.66 1.41 .91 17 .73 .72 1.15 1.04 1.19 1.30 1.34 1.67 1.44 1.66 1.16 .90 18 .75 .58 1.14 1.06 .87 1.26 1.34 1.69 1.43 1.65 .89 .21 19 .71 .59 1.15 1.15 .90 1.23 1.37 1.64 1.41 1.53 .88 .10 20 .69 .59 1.18 --- .95 1.24 1.44 1.67 1.43 1.49 .86 .08 21 .69 .68 1.21 .95 1.25 1.45 1.67 1.44 1.51 .86 .23 22 --- .75 1.22 1.09 1.26 1.44 1.72 1.46 1.54 .89 .33 23 .73 1.19 1.11 1.30 1.45 1.71 1.46 1.54 .95 .42 24 .76 1.17 1.10 1.38 1.47 1.72 1.46 1.53 .91 .29 25 .83 --- 1.13 1.41 1.50 1.72 1.47 1.56 .90 .35 26 .82 1.10 1.42 1.55 1.71 1.47 1.44 .91 .44 27 .82 1.06 1.44 1.59 1.71 1.49 1.40 .89 .47 28 .90 1.06 1.43 1.59 1.71 1.54 1.42 .88 .48 29 --- --- 1.44 1.63 1.65 1.62 1.44 .83 .60 30 1.42 1.49 1.63 1.61 1.46 .66 .68 31 1.41 --- 1.51 --- 1.47 .66 --- LOW 1.44 1.63 1.72 1.62 1.66 1.51 .98 HIGH 1.10 1.32 1.43 1.18 1.40 .66 .08 3 1 N IW 2 ONDJFMANJJ ASONDJFMAMJJ ASONDJFMAMJJ AS 1986 1987 1988 1989 NP\ 01"11,1„, ONDJFMAMJJ ASONDJFMAMJJ ASONDJ FM AMJ J AS 1986 1987 1988 1989 352 GROUND-WATER LEVELS RIO HONDO TO RIO PUERTO NUEVO BASINS 182623066111000. Local number, 218. LOCATION.--Lat 1826'23", 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 OF RECORD.--October 1985 to current year. EXTREMES FOR PERIOD OF 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. DAY OCT 1 6.64 2 6.66 3 6.80 4 6.81 5 6.80 6 6.83 7 6.74 8 6.67 9 6.61 10 6.62 11 6.54 12 6.53 13 6.52 14 6.53 15 6.54 16 6.55 17 6.59 18 6.71 19 6.77 20 6.78 21 6.78 22 6.79 23 6.75 24 6.74 25 6.76 26 6.78 27 7.08 28 7.10 29 7.14 30 7.16 31 7.19 LOW 7.19 HIGH 6.52 WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 INSTANTANEOUS OBSERVATION AT 1200 NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 7.22 7.48 7.53 7.74 7.80 7,67 8.29 7.72 7.55 6.55 7.23 7.52 7.54 7.73 7.74 7.70 8.00 7.70 7.51 6.56 7.24 7.53 7.53 7.75 7.70 7.81 7.88 7.64 7.47 6.60 7.24 7.52 7.52 7.77 7.66 7.84 7.73 7.65 7.42 6.65 7.26 7.52 7.52 7.77 7.65 7.86 7.67 7.65 7.39 6.67 7.24 7.55 7.75 7.64 7.88 7.27 7.69 7.46 6.68 7.25 7.57 7.75 7.64 7.86 7.24 7.69 7.47 6.71 7.25 7.59 --- 7.76 7.66 7.83 7.26 7.68 7,47 6.76 7.26 7.62 8.03 7.81 7.67 7.83 7.35 7.68 7.51 6.83 7.27 7.65 8.02 7.77 7.70 7.86 7.36 7.72 7.52 6.85 7.12 7.66 8.03 7.78 7.71 7.84 7.33 7.73 7.50 6.83 7.09 7.69 8.03 7.78 7.68 7.87 7.32 7.74 7.50 6.83 7.10 7.73 8.04 7.76 7.64 7.88 7.33 7.74 7.50 6.84 7.12 7.76 8.06 7,78 7.64 7.91 7.36 7.74 7.49 6.84 7.13 7.79 8.01 7,82 7.60 7.93 7.40 7.73 7.47 6.79 7.12 7.80 8.00 7.82 7.61 7.96 7.41 7.75 7.44 6.81 7.03 7.81 7.98 7.82 7.62 7.97 7.44 7.75 7.30 6.78 6,92 7.80 7.91 7.83 7.60 7.98 7.47 7.73 7.17 6.24 6.86 7.80 7.88 7.80 7.60 8.03 7.46 7.65 7.08 6.12 6.84 7.82 7.91 7.82 7.62 8.03 7.50 7.55 6.98 5.98 6.83 7.83 7.90 7.82 7.63 8.02 7.49 7.56 6.94 6.24 7.12 7.85 7.93 7.84 7.63 8.07 7.52 7.55 6,93 6.13 7,18 7.85 7.79 7.86 7.65 8.09 7.53 7.57 6.97 6.18 7,22 1.87 7.95 7.89 7.67 8.08 7.51 7.56 6.91 6.47 7.27 7.87 - 7.79 7.91 7.74 8.08 7.55 7.61 6.91 6.39 7.33 7.89 7.74 7.93 7.79 8.07 7.56 7.60 6.90 6.96 7.38 7.88 7.69 7.94 7.79 8.07 7.58 7.60 6.88 6.97 7.41 7.90 7.71 7.96 7.79 8.07 7.64 7.58 6.84 6.92 7.46 7.66 --- 7.96 7.80 8.05 7.69 7.59 6.80 7.01 7.45 7.60 7.95 7.69 8.38 7.71 7.55 6.67 7.13 --- 7.57 7.95 --- 8.33 --- 7.54 6.58 --- 7,46 7.90 7.96 7,80 8.38 8.29 7.75 1.55 7.13 6.83 7.48 7.73 7.60 7.67 7.24 7.54 6.58 5.98 GROUND-WATER LEVELS 353 RIO HONDO TO RIO PUERTO NUEVO BASINS 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, 35.58 ft (10.84 m) below land-surface datum, Sept. 27, 28, 1989; lowest water level recorded, 43.32 ft (13.20 m) below land-surface datum, Mar. 15, 1987. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 38.88 39.33 39.90 39.95 40.10 40.99 40.86 40.77 39.63 38.91 37.22 2 38.84 39.38 39.88 40.00 40.06 40.98 40.74 40.46 39.66 38.96 37.23 3 38.85 39.43 39.87 40.03 40.12 40.97 40.68 40.04 39.63 38.96 37.22 4 --- --- 39.49 39.89 40.07 40.17 40.95 40.66 39.70 39.60 38.98 37.23 5 39.38 39.54 39.96 40.10 40.20 40.95 40.66 39.45 39.63 39.04 37.24 6 39.40 39.61 40.04 40.13 40.20 40.93 40.68 39.33 39.67 39.07 37.27 7 39.43 39.64 40.07 40.16 40.28 40.92 40.66 39.24 39.65 39.13 37.36 8 39.45 39.71 40.04 40.16 40.34 40.93 40.57 39.22 39.63 39.15 37.42 9 39.42 39.75 40.07 40.16 40.37 40.97 40.54 39.26 39.61 39.25 37.32 10 39.42 39.78 40.08 40.16 40.39 40.98 40.53 39.30 39.64 39.31 37.16 11 39.44 39.81 39.97 40.16 40.41 41.00 40.55 39.17 39.64 39.33 37.06 12 39.44 39.82 39.81 40.16 40.45 41.03 40.57 38.97 39.55 39.38 37.01 13 39.45 39.85 39.65 40.18 40.48 41.02 40.64 38.90 39.46 39.45 36.96 14 39.39 39.92 39.54 40.21 40.50 40.99 40.69 38.89 39.33 39.49 36.99 15 39.30 40.01 39.47 40.17 40.51 40.91 40.72 38.91 39.25 39.52 37.04 16 39.24 40.05 39.44 40.21 40.51 40.83 40.76 38.94 39.13 39.56 37.09 17 39.15 40.12 39.43 40.19 40.55 40.79 40.82 38.98 39.09 39.48 37.00 18 39.05 40.14 39.46 40.10 40.57 40.74 40.86 38.98 39.11 39.33 36.39 19 39.00 40.19 39.48 39.99 40.54 40.74 40.92 39.00 39.03 39.05 36.51 20 38.97 40.22 39.48 39.95 40.55 40.78 40.98 39.06 38.93 38.78 36.34 21 38.95 40.28 39.48 39.96 40.60 40.82 41.03 39.14 38.89 38.52 36.17 22 38.99 40.31 39.51 39.98 40.66 40.88 41.08 39.19 38.86 38.41 36.08 23 39.03 40.32 39.54 40.00 40.70 40.97 41.12 39.27 38.77 38.40 36.02 24 39.04 40.31 39.57 40.06 40.75 41.00 41.16 39.31 38.68 38.28 35.82 25 39.08 40.30 39.61 40.11 40.76 41.04 41.20 39.36 38.67 38.07 35.70 26 39.13 40.24 39.69 40.12 40.78 41.07 41.25 39.37 38.70 37.82 35.64 27 39.16 40.20 39.72 40.14 40.81 41.11 41.31 39.43 38.73 37.70 35.63 28 39.17 40.19 39.76 40.13 40.84 41.15 41.33 39.50 38.77 37.59 35.60 29 39.21 40.14 39.82 40.88 41.24 41.32 39.55 38.82 37.43 35.63 30 39.27 40.05 39.85 40.92 41.05 41.29 39.60 38.85 37.33 35.66 31 39.96 39.89 40.98 41.06 38.89 37.24 LOW 40.32 40.08 40.21 40.98 41.24 41.33 40.77 39.67 39.56 37.42 HIGH 39.33 39.43 39.95 40.06 40.74 40.53 38.89 38.67 37.24 35.60 0 34 W W < LAJ w 38 Z _sg LaJ > (1) 42 Lai -1C3 cEZ 46 3 ONDJ FM AMJ J ASO NDJ FMAMJ J ASO NDJ FMAMJ J AS 1986 1987 1988 1989 354 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 AQUIFER.--Surficial 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, 3.41 ft (1.04 m) below land-surface datum, Sept. 29-30, 1989 WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 INSTANTANEOUS OBSERVATION AT 1260 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 +.91 +.58 +.61 +.65 +.57 +.81 +.30 +.45 +.79 +.47 +1.05 2 +.92 +.52 +.62 +.64 +.53 +.73 +.30 +.65 +.77 +.45 +1.03 3 +.87 +.46 +.61 +.63 +.51 +.69 +.30 +.98 +.75 +.44 +1.02 4 +.91 +.43 +.54 +.61 +.50 +.66 +.29 +1.10 +.73 +.42 +1.00 5 +.92 +.41 +.52 +.57 +.44 +.63 +.28 +1.11 +.71 +.40 +.97 6 +.89 +.45 +.47 +.51 +.45 +.63 --- +.28 +1.11 +.69 +.39 +.94 7 +.88 +.38 +.47 +.49 +.44 +.61 +.51 +.28 +1.11 +.67 +.37 +.91 8 +.89 +.41 +.41 +.54 +.50 +.57 +.36 +.30 +1.11 +.65 +.35 +.88 9 +1.01 +.43 v.45 +.52 +.51 +.58 +.36 +.30 +1.11 +.62 +.35 +.89 10 +1.05 +.44 +.42 +.52 +.51 +.59 +.37 +.30 +1.10 +.60 +.33 +.89 11 +1.04 +.41 +.39 +.67 +.52 +.57 +.27 +.30 +1.10 +.58 +.34 +.98 12 +1.01 +.42 +.37 +.74 +.49 +.59 +.17 +.30 +1.10 +.56 +.32 +1.02 13 +1.00 +-.39 +.36 +.86 +.46 +.63 +.25 +.29 +1.10 +.58 +.30 +1.01 14 +1.00 +.55 +.34 +.89 +.42 +.68 +.31 +.27 +1.10 +.72 +.29 +.99 15 +1.00 +.58 +.32 +.89 +.44 +.68 +.35 +.23 +1.07 +.72 +.29 +1.03 16 +.97 +.61 +.31 +.88 +.52 +.72 +.34 +.20 +1.04 +.72 +.31 +1.04 17 +.92 +.77 +.33 +.90 +.67 +.70 +.34 +.17 +1.01 +.72 +.38 +1.06 18 +.88 +.74 +.35 +.91 +.78 +.59 +.34 +.14 +.99 v.70 +.45 +1.09 19 +.85 +.77 +.32 +.88 +.82 v.56 +.34 +.13 +1.01 +.69 +.53 +1.09 20 +.82 +.75 +.29 +.88 +.81 +.57 +.34 +.10 +.99 +.67 +.69 +1.09 +.33 +.08 +.98 +.65 +.70 +1.10 21 +.77 +.79 +.31 +.86 +.80 +.56 +.31 +.05 +.97 +.64 +.71 +1.10 22 +.72 +.85 +.36 +.80 +.75 +.55 23 +.71 +.83 +.39 +.76 +.74 +.54 +.28 +.03 +.96 +.62 +.70 +1.10 24 +.65 +.83 +.44 +.72 +.72 +.50 +.26 +.02 +.94 +.60 +.72 +.71 25 +.62 +.78 +.55 +.72 +.70 +.49 +.24 .00 +.92 +.59 +.87 +.70 26 +.61 +.80 +.58 +.70 v.67 +.47 +.21 +.06 +.89 +.57 +.83 2.76 27 +.58 +.75 +.59 +.68 +.78 +.45 +.20 +.03 +.87 +.55 +.83 3.06 28 +.57 +.73 +.58 +.64 +.82 +.44 +.18 +.05 +.85 +.54 +.86 3.23 29 +.59 +.69 +.64 +.62 --- +.39 +.16 +.10 +.83 +.52 +1.03 3.35 +.26 +.14 +.81 +.50 +1.05 3.37 --- +.42 --- +.49 +1.06 --- 30 +.62 +.65 +.65 +.57 +.49 LOW +.57 +.38 +.29 +.49 v.42 .00 +.45 +.49 +.29 3.37 HIGH +1.05 +.85 +.65 +.91 +.82 +.42 +.79 +1.10 +1.11 +1.06 +4 9 Clap We +2 La w u., t) z-g• 6: 0 ta.10 2 J o (E Z Wfl 4C 4 ONDJ FMAMJ J ASONDJ FMAMJ J ASONDJ FMAMJ J AS 1986 1987 1988 1989 + Above land-surface datum. GROUND-WATER LEVELS 355 RIO HONDO TO RIO PUERTO NUEVO BASINS 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 1988 TO SEPTEMBER 1989 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 6.28 6.95 5.86 6.50 6.83 5.81 7.15 8.01 7.14 6.98 8.01 5.18 2 6.36 7.05 5.97 6.57 6.83 5.93 7.09 7.97 6.17 7.07 8.08 5.33 3 6.45 7.12 6.09 6.65 6.91 6.12 7.03 8.02 2.51 7.05 8.17 5.47 4 6.30 7.16 6.19 6.73 6.97 6.25 7.02 8.06 --- 7.15 8.16 5.63 5 6.21 7.24 6.28 6.81 7.03 6.36 7.03 8.11 7.23 8.23 5.78 6 6.33 7.28 6.35 6.90 7.06 6.41 6.76 8.04 7.24 8.11 5.90 7 6.27 7.26 6.41 6.95 7.06 6.38 6.75 7.89 --- 7.23 8.16 6.05 8 6.36 7.17 6.49 6.90 7.11 6.46 6.84 7.76 5.41 6.98 8.25 6.01 9 4.95 6.99 6.54 6.86 7.10 6.54 6.85 7.81 5.57 7.09 8.35 5.84 10 5.17 7.03 6.58 6.91 7.12 6.60 6.90 7.86 5.69 7.22 8.41 4.99 11 5.34 7.05 6.62 6.61 7.10 6.63 6.94 7.96 5.71 7.28 8.50 3.96 12 5.48 7.11 6.68 5.82 7.13 6.70 7.00 8.05 5.82 7.32 8.42 4.58 13 5.57 7.17 6.74 5.04 7.19 6.51 6.97 8.13 5.94 7.41 8.41 4.99 14 5.66 4.66 6.81 5.37 7.26 6.45 6.89 8.22 6.05 7.47 8.07 5.23 15 5.77 4.97 6.88 5.56 7.26 6.47 6.91 8.32 6.14 7.55 8.00 4.54 16 5.91 4.98 6.92 5.70 7.12 6.51 7.00 8.43 6.25 7.59 7.93 4.83 17 6.07 4.31 6.98 5.76 5.06 6.56 7.07 8.54 6.33 7.65 7.63 4.81 18 6.19 4.23 6.91 5.86 5.08 6.54 7.15 8.68 6.39 7.72 6.90 .70 19 6.30 4.55 7.01 5.96 5.22 6.50 7.25 8.77 5.77 7.65 6.75 2.62 20 6.42 4.82 7.07 6.06 5.25 6.53 7.32 8.91 5.80 7.49 5.91 3.65 21 6.49 4.98 7.05 6.14 5.36 6.60 7.39 9.05 5.88 7.59 5.99 2.83 22 6.55 5.00 7.09 6.26 5.52 6.68 7.47 9.19 6.07 7.56 5.84 3.87 23 6.61 4.78 7.04 6.34 5.67 6.75 7.54 9.32 6.22 7.54 5.75 4.41 24 6.67 4.98 6.98 6.43 5.74 6.86 7.61 9.45 6.34 7.56 5.12 3.39 25 6.72 5.18 6.54 6.49 5.84 6.91 7.68 9.57 6.43 7.65 4.16 4.29 26 6.77 5.30 6.46 6.57 5.97 6.98 7.75 9.70 6.50 7.73 4.84 4.70 27 6.85 5.39 6.54 6.61 5.77 7.05 7.82 9.77 6.59 7.80 5.20 5.11 28 6.91 5.50 6.62 6.68 5.66 7.09 7.90 9.55 6.69 7.77 5.41 5.32 29 6.91 5.63 6.47 6.74 --- 7.17 7.98 9.28 6.77 7.87 5.39 5.38 30 6.91 5.75 6.44 6.79 7.22 8.00 9.20 6.88 7.95 4.42 5.55 31 6.99 --- 6.44 6.88 7.29 --- 8.11 --- 7.99 4.92 --- LOW 6.99 7.28 7.09 6.95 7.26 7.29 8.00 9.77 7.99 8.50 6.05 HIGH 4.95 4.23 5.86 5.04 5.06 5.81 6.75 7.76 6.98 4.16 .70 0 W o•-‹ Law 5 1- c.) La Atc, -ix > tn 10 La -J 0 Z W <1 a- 15 ONDJFMAMJJ ASONDJFMAMJJ ASONDJFMAMJJ AS 1986 1987 1988 1989 356 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.--Observation well. Automatic digital recording installed on August 1989. PERIOD OF RECORD.--July 1989 to September 1989. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 8.26 ft (2.52 m) below land-surface datum, Sept. 25, 1989; lowest water level recorded, 10.31 ft (3.14 m) below land-surface datum, Aug. 13-14, 1989. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 8.82 2 8.89 3 8.99 4 9.03 5 9.12 6 9.18 7 9.23 8 9.30 9 9.21 10 10.16 8.99 11 10.21 8.83 12 10.25 8.74 13 10.29 8.79 14 10.23 8.89 15 10.26 8.81 16 10.17 8.77 17 10.15 8.74 18 9.76 8.52 19 9.61 8.34 20 9.54 8.31 21 9.31 8.30 22 9.33 8.34 23 9.32 8.43 24 9.23 8.33 25 9.08 8.29 26 8.99 8.32 27 9.06 8.38 28 8.98 8.47 29 9.00 8.44 30 8.79 8.46 31 8.79 LOW 9.30 HIGH 8.29 7 a k 3i 1- < La La La. Z 9 - et -J D tn 6.1 I -I GI IXZ 4C 11 3 SEPTEMBER AUGUST 1989 357 GROUND-WATER LEVELS RIO HONDO TO RIO PUERTO NUEVO BASINS 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.--Grilled 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.--Observation well. Automatic digital recorder installed on May 1989. PERIOD OF RECORD.--April 1989 to September 1989. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 26.23 ft (7.99 m) below land-surface datum, Sept. 29-30, 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 1988 TO SEPTEMBER 1989 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 29.26 27.50 28.10 2 29.20 27.52 28.02 3 29.12 27.54 27.93 4 29.00 27.55 27.87 5 28.86 27.57 27.82 6 28.72 27.61 27.78 7 28.56 27.64 27.75 8 28.41 27.55 27.73 9 28.29 27.53 27.65 10 28.17 27.55 27.58 11 28.05 27.56 28.92 27.50 12 29.01 27.93 27.57 28.93 27.47 13 29.03 27.85 27.59 28.94 27.43 14 29.04 27.76 27.60 28.96 27.38 15 29.05 27.69 27.61 28.96 27.30 16 29.08 27.64 27.64 28.96 27.24 17 29.13 27.59 27.66 28.98 27.17 18 29.15 27.53 27.68 28.93 27.01 19 29.16 27.50 27.80 28.92 26.98 20 29.18 27.47 27.89 28.92 26.88 21 29.19 27.44 27.74 28.90 26.80 22 29.19 27.43 27.75 28.89 26.74 23 29.20 27.42 27.77 28.84 26.68 24 29.22 27.42 27.78 28.79 26.55 25 29.22 27.42 27.81 28.69 26.44 26 29.24 27.43 27.85 28.63 26.38 27 29.31 27.44 27.89 28.58 26.36 28 29.34 27.45 27.91 28.48 26.33 29 29.36 27.46 28.41 26.24 30 29.38 27.48 28.29 26.27 31 29.34 28.19 LOW 29.26 28.10 HIGH 27.42 26.24 o 25 r1 La La ()La 27 Z _Ts ">Iu? 29 G z -J 4c 4C 31 MAY JUN JUL AUG SEP 1989 368 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.--Observation well. Automatic digital recording installed on July 1989. PERIOD OF RECORD.--July 1989 to September 1989. EXTRFMES 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, 6.45 ft (1.69 m) below land-surface datum, Aug. 16, 1989. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 5.14 2 5.20 3 5.22 4 5.32 5 5.41 6 5.50 7 5.64 8 5.66 9 5.52 10 5.25 11 5.01 12 5.04 13 5.07 14 5.65 5.12 15 5.73 5.05 16 5.82 --- 4.98 17 5.88 6.10 4.95 18 5.94 5.77 3.11 19 5.94 --- 4.54 20 5.97 4.54 21 5.82 4.50 22 5.80 --- 4.50 23 5.77 5.47 4.50 24 5.74 5.38 4.34 25 5.82 5.25 4.34 26 5.90 5.22 4.44 27 5.96 5.28 4.50 28 5.89 5.24 4.60 29 4.98 4.59 30 5.04 4.67 31 5.10 LOW 5.66 HIGH 3.11 2 M fa 1_4( 4 o w zics _rg >N 6 WI0 Z - 8 JUL AUG SEP 1989 359 GROUND-WATER LEVELS RIO HONDO TO RIO PUERTO NUEVO BASINS 182437066040501. Local number, PN-7. LOCATION.--Lat 18°24'37", long 66'04'05" Owner: U.S. Geological Survey, WRD. Name: Parque 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.--Observation well. Automatic digital recording installed on May 1989. PERIOD OF RECORD.--February 1989 to September 1989. 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, 9.51 ft (2.90 m) below land-surface datum, May 26, 1989. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 8.78 8.27 8.58 7.57 2 8.48 8.33 8.63 7.56 3 --- 7.87 8.33 8.67 7.56 4 8.98 7.46 8.33 8.63 7.56 5 8.98 7.18 8.36 --- 7.56 6 8.99 7.11 8.37 7.76 7 9.00 7.07 8.37 7.93 8 8.95 7.10 8.37 --- 7.93 9 8.93 7.22 8.36 9.09 7.93 10 8.93 7.29 8.36 9.13 7.75 11 8.94 7.39 8.36 --- 7.53 12 8.96 7.40 8.33 8.95 7.52 13 8.99 7.43 8.33 8.94 7.51 14 9.04 7.58 8.33 8.94 7.51 15 9.09 7.69 8.37 8.94 7.49 16 9.15 7.78 8.42 8.94 7.44 17 9.19 7.89 8.48 8.84 7.40 18 9.24 7.92 8.54 8.63 6.82 19 9.28 7.76 8.54 8.55 6.75 20 9.31 7.69 8.54 8.40 6.75 21 9.35 7.69 8.55 8.33 6.63 22 9.39 7.69 8.55 8.24 6.63 23 9.43 7.69 8.55 8.22 6.63 24 9.46 7.73 8.54 8.17 6.58 25 9.48 7.81 8.54 7.94 6.51 26 9.51 7.92 8.54 7.86 6.51 27 9.47 7.98 8.55 7.76 6.50 28 9.40 8.07 8.55 7.76 6.53 29 9.34 8.16 8.55 7.76 6.59 30 9.29 8.22 8.56 7.65 6.64 31 9.11 --- 8.58 7.57 --- LOW 8.78 8.58 7.93 HIGH 7.07 8.27 6.50 rf J SEP MAY JUN JUL AUG 1989 360 GROUND-WATER LEVELS RIO HONDO TO RIO PUERTO NUEVO BASINS 182443066041502. Local number, PN-8. LOCATION.--Lat 18°24'43", long 66'04'15". Owner: U.S. Geological Survey, WRD. Name: Parque Luis Munoz Marin IC. 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.--Observation well. Automatic digital recording installed on May 1989. PERIOD OF RECORD.--February 1989 to September 1989. 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, 14.44 ft (4.40 m) below land-surface datum, Aug. 17, 1989. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 13.53 13.68 12.73 2 13.21 13.72 12.84 3 11.59 13.63 12.91 4 11.29 13.73 13.08 5 10.87 13.78 13.21 6 10.92 13.80 13.31 7 11.14 13.76 13.44 8 11.38 13.70 13.38 9 11.63 13.77 13.37 10 11.86 13.82 13.12 11 11.87 13.84 12.57 12 --- 12.17 13.48 12.57 13 14.25 12.37 13.66 12.62 14 14.27 12.55 13.61 12.71 15 14.28 12.69 13.76 12.57 16 14.30 12.84 13.81 14.43 12.53 17 14.31 12.96 13.84 14.29 12.50 18 14.33 12.86 13.88 14.09 10.71 19 14.34 12.87 13.83 14.01 10.92 20 14.35 12.91 13.74 13.75 10.99 21 14.36 12.98 13.95 13.71 10.78 22 14.37 13.07 13.92 13.78 10.81 23 14.38 13.17 13.97 13.82 11.04 24 14.31 13.26 13.97 13.72 10.40 25 14.30 13.34 14.03 13.35 10.36 26 14.30 13.40 14.06 13.11 10.47 27 14.28 13.45 14.09 13.09 10.68 28 14.31 13.51 13.97 13.23 10.76 29 14.30 13.58 12.94 10.83 30 14.27 13.63 12.61 11.02 31 14.06 12.66 LOW 13.63 13.44 HIGH 10.87 10.36 MAY JUN JUL AUG SEP 1989 GROUND-WATER LEVELS 361 - RIO HONDO TO RIO PUERTO NUEVO BASINS 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.--Observation well. Automatic digital recording installed on May 1989. PERIOD OF RECORD.--March 1989 to September 1989. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 8.75 ft (2.67 11) 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 1988 TO SEPTEMBER 1989 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 15.20 15.83 15.59 16.00 2 --- 15.26 15.81 --- 16.03 3 15.75 12.45 15.66 16.07 4 15.83 14.79 15.78 16.11 5 15.71 14.96 15.79 16.16 6 15.84 15.16 15.74 16.19 7 15.73 15.24 15.40 16.25 8 15.81 15.29 15.57 --- 16.08 9 15.86 15.41 15.71 16.66 16.09 10 15.86 15.41 15.75 16.66 15.96 11 15.87 14.97 15.78 16.54 15.47 12 15.89 15.41 15.03 16.59 15.86 13 15.90 15.45 15.56 16.64 15.91 14 15.91 15.49 15.36 16.59 15.92 15 15.93 15.54 15.69 16.60 15.90 16 15.94 15.57 15.73 16.58 15.87 17 15.95 15.58 15.70 15.90 15.72 18 15.95 15.39 15.74 16.12 8.97 19 15.97 15.55 15.63 16.06 14.94 20 15.98 15.59 15.83 15.36 15.31 21 15.99 15.61 15.66 15.90 15.21 22 16.00 15.65 15.47 16.23 15.30 23 16.01 15.67 15.64 16.27 15.43 24 16.01 15.69 15.60 16.24 14.72 25 16.01 15.72 15.65 16.07 15.23 26 16.01 15.73 15.85 16.05 15.37 27 15.89 15.76 15.72 15.90 15.43 28 15.99 15.79 15.47 16.21 15.16 29 15.95 15.80 15.59 15.20 15.29 30 15.94 15.81 15.63 15.69 15.39 31 15.88 15.56 15.94 LOW 15.81 15.85 16.25 HIGH 12.45 15.03 8.97 9:E 6 g ▪La0 LIJ La 10 z 14 J -Jo OC 18 3 MAY JUN JUL AUG SEP 1989 362 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 1988 TO SEPTEMBER 1989 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 5.76 5.83 5.89 5.63 5.84 5.94 5.81 6.26 5.79 6.50 6.28 5.81 2 5.88 5.89 5.97 5.69 5.90 5.91 5.83 6.26 5.72 6.30 6.18 5.76 3 5.93 5.82 5.85 5.64 5.91 5.82 5.85 6.31 5.85 6.21 5.94 5.82 4 5.90 5.81 5.71 5.55 5.99 5.85 5.84 6.25 --- 6.12 5.74 5.89 5 5.80 5.66 5.69 5.54 5.96 5.80 5.84 6.27 6.11 5.87 6.04 6 5.76 5.51 5.66 5.37 5.86 5.77 5.85 6.25 --- 6.15 5.97 6.04 7 5.63 5.56 5.65 5.40 5.80 5.77 5.94 6.19 6.15 6.10 6.08 5.88 8 5.58 5.55 5.43 5.47 5.81 5.75 6.01 6.11 6.22 6.09 6.13 5.87 9 5.45 5.56 5.44 5.57 5.85 5.77 6.02 6.18 6.30 6.14 6.23 --- 10 5.40 5.53 5.48 5.63 5.87 5.74 6.10 6.22 6.31 6.28 6.41 11 5.40 5.52 5.51 5.73 5.89 5.81 6.10 6.24 6.36 6.30 6.40 12 5.43 5.52 5.58 5.73 5.93 5.79 5.97 6.34 6.41 6.35 6.39 13 5.54 5.59 5.62 5.69 5.93 5.76 5.89 6.31 6.47 6.43 6.39 14 5.5d 5.67 5.73 5.75 6.05 5.82 5.96 6.42 6.50 6.51 6.30 15 5.63 5.81 5.78 5.71 5.73 5.89 5.89 6.46 6.51 6.50 6.26 16 5.68 5.69 5.75 5.84 5.75 5.87 5.86 6.49 6.53 6.53 6.14 17 5.82 5.69 5.67 5.80 5.77 5.86 5.91 6.43 6.50 6.40 5.88 18 5.88 5.67 5.58 5.91 5.63 5.80 6.00 6.48 6.46 6.26 5.69 19 5.84 5.61 5.59 5.85 5.65 5.72 6.00 6.49 6.33 6.11 5.70 20 5.80 5.54 5.54 5.75 5.70 5.69 6.05 6,42 6.27 6.01 5.69 21 5.77 5.51 5.55 5.70 5.74 5.71 6.01 6.02 6.19 5.97 5.80 22 5.65 5.43 5.51 5.68 5.83 5.75 5.98 6.06 6.13 5.95 6.01 23 5.49 5.42 5.43 5.68 5.88 5.81 6.01 6.00 6.10 6.04 6.29 24 5.39 5.40 5.51 5.66 5.86 5.95 6.05 6.08 6.10 6.14 6.42 25 5.31 5.48 5.58 5.63 5.85 6.06 6.14 6.11 6.24 6.29 6.44 26 5.35 5.60 5.64 5.71 5.79 6.04 6.24 6.12 6.28 6.42 6.42 27 5.42 5.64 5.67 5.74 5.71 6.06 6.17 6.19 6.34 6.52 6.35 28 5.55 5.81 5.74 5.70 5.88 6.10 6.12 6.04 6.50 6.55 6.29 29 5.61 5.90 5.76 5.85 --- 6.08 6.23 6.00 6.64 6.50 6.08 30 5.70 5.87 5.70 5.89 6.04 6.21 5.86 6.61 6.32 5.93 31 5.80 --- 5.71 5.87 5.96 --- 5.79 --- 6.31 5.91 LOW 5.93 5.90 5.97 5.91 6.05 6.10 6.24 6.49 6.55 6.44 HIGH 5.31 5.40 5.43 5.37 5.63 5.69 5.81 5.79 5.95 5.69 W4 m 1- L,1 cl 5 La/ w Z v \AAAAtitoalivivi ". 6 tv,v lai tJ o 7 etz W Qi < 8 J AS 1986 1987 1988 ONDJ FMAMJJ ASONDJ FMAMJJ ASONDJ FMAMJ 1989 GROUND-WATER LEVELS 363 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 1988 TO SEPTEMBER 1989 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 51.87 50.18 49.38 48.98 50.94 53.56 52.22 45.38 51.08 52.83 55.40 57.11 2 51.64 49.79 49.13 49.12 51.24 53.60 52.28 45.16 48.13 52.28 55.49 57.19 3 51.03 49.59 48.65 49.26 51.45 53.62 52.34 45.24 47.02 51.87 55.58 57.28 4 50.62 49.48 48.92 49.40 51.55 53.58 52.39 45.19 46.52 52.26 55.66 57.36 5 50.84 48.88 49.10 49.50 51.77 53.50 52.44 45.08 46.44 52.77 55.75 57.44 6 50.96 46.88 48.63 49.58 51.90 53.42 52.45 45.27 46.22 53.08 55.83 57.53 7 51.08 45.88 47.81 49.63 52.06 53.38 52.39 45.61 46.84 53.32 55.90 57.62 8 51.17 46.95 48.45 49.69 52.17 53.36 52.31 45.36 48.27 53.52 55.97 57.71 9 51.26 47.76 48.76 49.79 52.28 53.35 52.35 46.03 49.36 53.70 56.06 57.79 10 51.35 48.11 48.99 49.93 52.38 53.26 52.41 47.14 49.50 53.85 56.12 57.89 11 51.43 48.30 49.12 49.91 52.46 53.20 52.49 47.91 49.78 53.99 56.17 57.98 12 51.51 48.45 49.12 49.69 52.56 53.18 52.55 48.15 49.20 54.12 56.21 58.07 13 51.58 48.58 48.97 49.79 52.66 53.16 52.48 47.86 49.28 54.24 56.25 58.16 14 51.66 48.69 48.32 49.88 52.76 53.11 52.35 48.47 49.15 54.36 56.30 58.25 15 51.72 48.73 48.54 50.02 52.87 53.03 52.18 48.90 49.61 54.48 56.34 58.34 16 51.79 48.90 48.60 50.19 52.94 52.97 52.04 49.25 50.62 54.59 56.39 58.42 17 51.86 48.98 48.68 50.37 52.73 52.92 51.95 49.53 51.19 54.70 56.44 58.53 18 51.91 49.07 48.76 50.53 52.73 52.89 51.90 49.74 50.42 54.82 56.48 58.62 19 51.97 49.14 48.77 50.68 52.86 52.83 51.86 49.11 49.60 54.93 56.53 58.72 20 52.03 49.18 48.76 50.77 52.98 52.77 51.77 48.80 50.20 55.03 56.57 58.80 21 52.07 49.20 48.74 50.86 53.09 52.69 51.67 49.47 51.13 55.13 56.62 58.90 22 52.09 49.23 48.74 50.90 53.19 52.60 51.02 49.90 51.70 55.21 56.67 58.99 23 52.04 49.27 48.81 50.93 53.29 52.50 49.33 50.21 52.11 55.26 56.72 59.08 24 51.96 49.31 48.83 50.10 53.36 52.41 48.22 50.47 52.17 55.20 56.77 59.18 25 51.87 49.36 48.73 49.86 53.40 52.34 47.97 50.72 51.46 55.05 56.73 59.15 26 51.80 49.40 48.06 50.48 53.45 52.28 47.14 50.92 50.25 54.85 56.72 59.02 27 51.75 49.46 48.09 50.82 53.48 52.26 46.55 51.08 50.70 54.74 56.78 58.83 28 51.71 49.50 48.51 51.06 53.52 52.25 46.08 51.21 51.56 54.87 56.84 58.60 29 51.57 49.56 48.10 51.21 52.26 45.87 51.36 52.16 55.04 56.90 58.34 30 51.28 49.53 48.78 50.50 52.20 45.62 51.52 52.53 55.20 56.96 58.09 31 50.72 48.86 50.52 52.18 51.70 55.31 57.03 LOW 52.09 50.18 49.38 51.21 53.52 53.62 52.55 51.10 52.53 55.31 57.03 59.18 HIGH 50.62 45.88 47.81 48.98 50.94 52.18 45.62 45.08 46.22 51.87 55.40 57.11 WTR YR 1989 MEAN 51.88 LOW 59.18 HIGH 45.08 32 H‹ W 0 La w t, 42 z es > A „, 52 crz W-J 4( 62 ONDJFMAMJJ ASONDJFMAMJJ ASONDJFMAMJJ AS 1986 1987 1988 1989 i GROUND-WATER LEVELS 364 RIO HUMACAO 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: USGS 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. 2, 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 1988 TO SEPTEMBER 1989 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 17.53 16.77 18.10 17.58 19.05 19.91 19.60 20.18 22.08 21.76 21.04 22.14 2 17.70 16.79 18.11 17.37 19.09 19.96 19.65 20.27 22.01 21.76 21.09 22.12 3 17.85 16.84 18.12 17.17 19.09 19.99 19.70 20.36 21.95 21.72 21.13 22.12 4 17.88 16.88 18.14 17.01 19.06 20.01 19.74 20.45 21.88 21.69 21.16 22.15 5 17.89 16.94 18.14 16.97 18.98 20.06 19.78 20.48 21.81 21.69 21.20 22.18 6 17.86 17.03 18.11 16.96 18.91 20.10 19.82 20.43 21.75 21.71 21.24 22.20 7 17.80 17.06 18.06 16.96 18.84 20.12 19.87 20.33 21.71 21.76 21.31 22.22 8 17.72 17.09 18.00 16.94 18.78 20.11 19.87 20.20 21.68 21.79 21.37 22.23 9 17.65 17.14 18.01 16.93 18.73 20.09 19.86 20.14 21.66 21.79 21.43 22.25 10 17.56 17.18 18.03 16.95 18.73 20.06 19.86 20.17 21.60 21.74 21.51 22.26 11 17.47 17.28 18.06 17.00 18.75 19.98 19.89 20.19 21.54 21.73 21.60 22.29 12 17.39 17.43 18.11 17.07 18.81 19.92 19.95 20.19 21.48 21.66 21.71 22.29 13 17.28 17.60 18.17 17.16 18.88 19.88 20.03 20.20 21.43 21.59 21.82 14 17.20 17.78 18.15 17.27 18.94 19.84 20.10 20.22 21.39 21.55 21.90 15 17,14 17.94 18.09 17.36 19.00 19.74 20.20 20.21 21.35 21.51 21.96 16 17.09 18.08 18.02 17.50 19.05 19.64 20.31 20.21 21.37 21.47 22.04 17 17.04 18.16 17.91 17.61 19.13 19.53 20.42 20.26 21.39 21.45 22.12 18 16,99 18.20 17.79 17.73 19.31 19.46 20.49 20.31 21.39 21.43 22.25 19 16.97 18.24 17.69 17.85 19.43 19.42 20.46 20.37 21.47 21.40 22.32 20 16.95 18.25 17.54 17.97 19.50 19.37 20.41 20.45 21.54 21.34 22.33 21 16.91 18.25 17.46 18.07 19.54 19.34 20.36 20.61 21.64 21.28 22.32 22 16.90 18.24 17.40 18.16 19.56 19.32 20.31 20.88 21.72 21.23 22.33 23 16.88 18.22 17.51 18.22 19.56 19.29 20.19 21.16 21.76 21.18 22.35 24 16.87 18.21 17.58 18.29 19.54 19.27 20.00 21.49 21.80 21.14 22.37 25 16.86 18.20 17.68 18.34 19.55 19.26 19.82 21.78 21.84 21.10 22.36 26 16,86 18.20 17.75 18.41 19.62 19.26 19.78 22.02 21.83 21.09 22.29 27 16.81 18.20 17.80 18.50 19.70 19.27 19.81 22.15 21.80 21.07 22.19 28 16.73 18.18 17.88 18.63 19.80 19.32 19.89 22.24 21.77 21.05 22.15 29 16.71 18.15 17.99 18.76 19.39 19.98 22.26 21.76 20.99 22.14 30 16.71 18.13 17.95 18.89 19.47 20.07 22.22 21.76 20.97 22.14 31 16.74 17.78 19.00 19.54 22.13 20.99 22.15 LOW 17.89 18.25 18.17 19.00 19.80 20.12 20.49 22.26 22.08 21.79 22.37 HIGH 16.71 16.77 17.40 16.93 18.73 19.26 19.60 20.14 21.35 20.97 21.04 3: • 10 1-4 w e) 14 la1 Z • c.) --ct 18 kir-r\tv-v 22 c Ltz • Qi 26 ONDJFMAMJJ ASONDJFMAMJJ ASONDJFMAMJ J AS 1989 1986 1987 1988 365 GROUND-WATER LEVELS RIO SALINAS TO RIO JACAGUAS BASINS 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-c4ean-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, 1974. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 23.77 22.94 23.54 23.77 24.76 28.28 28.39 30.53 31.25 32.33 33.07 30.56 2 23.59 22.81 23.70 23.08 24.93 28.41 28.26 30.96 30.76 32.09 33.09 30.58 3 23.49 22.54 23.64 23.17 25.18 28.72 28.28 31.00 30.41 31.70 32.68 30.41 4 23.46 22.62 22.86 23.67 25.44 28.68 27.87 31.04 30.26 31.91 32.23 30.30 5 23.48 22.38 22.60 23.79 25.32 28.57 28.87 30.78 29.96 32.17 32.25 30.62 6 23.48 22.36 21.97 23.76 25.52 28.64 29.05 30.97 30.25 31.90 32.00 30.49 7 23.59 22.41 21.71 23.85 25.52 28.75 29.06 30.07 31.06 31.89 32.53 30.87 8 23.42 22.42 22.95 24.13 25.74 28.89 29.12 30.38 31.76 31.27 32.93 31.01 9 22.95 22.40 23.24 24.07 25.70 29.39 29.19 30.71 31.95 30.96 32.08 31.28 10 21.75 22.66 22.77 24.24 25.90 29.36 29.16 30.63 32.20 31.66 32.64 30.76 11 22.35 22.79 22.39 24.42 26.02 29.21 29.36 31.34 31.91 31.78 32.52 30.29 12 22.66 22.89 21.72 24.46 26.14 29.22 29.34 31.05 31.58 32.27 32.91 30.16 13 22.57 23.08 22.32 24.73 25.86 28.53 28.89 30.60 31.90 32.36 31.67 30.18 14 22.89 22.87 22.73 24.66 26.24 28.30 29.14 29.92 31.67 32.43 31.15 30.91 15 22.79 23.10 22.85 24.75 26.49 28.28 29.34 30.81 31.66 32.56 31.71 30.74 16 22.83 23.28 22.99 24.50 26.02 28.34 28.54 31.06 31.32 32.67 31.92 30.60 17 22.87 23.07 21.86 24.64 26.26 28,31 28.86 30.84 31.14 32.41 32.03 30.03 18 23.01 22.99 21.33 24.78 26.17 28.62 29.14 31.54 30.77 32.19 31.48 29.77 19 23.38 22.95 21.87 24.58 26.19 28.20 29.46 31.46 30.66 32.85 30.95 29.87 20 23.29 22.94 22.07 24.50 26.21 27.97 29.72 31.60 31.47 32.79 30.70 29.98 21 23.09 22.94 22.77 24.56 26.30 27.90 30.02 31.24 31.40 31.98 30.52 30.52 22 22.99 23.01 23.02 24.47 27.07 27.87 30.23 31.10 31.65 33,14 30.47 30.08 23 22.91 23.08 23.92 24.34 27.57 28.17 29.90 31.13 31.51 33.19 30.69 29.75 24 22.85 23.15 24.49 24.64 27.77 28.11 30.48 31.21 31.95 32.98 30.35 29.39 25 23.00 23.18 24.49 24.88 27.96 28.08 30.26 31.34 31.44 33.14 30.28 29.28 26 23.07 23.27 24.55 25.12 27.80 28.29 30.23 31.37 31.05 32.69 30.33 29.26 27 22.95 23.26 24.53 25.20 27.81 28.12 30.67 30.77 31.59 32.98 30.55 29.36 28 22.88 22.86 24.85 24.76 28.14 28.69 30.57 30.25 31.92 32.93 30.38 29.59 29 22.93 23.06 24.56 24.18 29.08 30.77 30.16 32.51 33.18 30.64 29.36 30 23.04 23.30 24.18 24.09 28.79 29.76 30.68 32.11 32.24 30.38 29.70 31 22.91 24.00 24.45 28.41 30.69 32.65 30.36 LOW 23.77 23.30 24.85 25.20 28.14 29.39 30.77 31.60 32.51 33.19 33.09 31.28 HIGH 21.75 22.36 21.33 23.08 24.76 27.87 27.87 29.92 29.96 30.96 30.28 29.26 WTR YR 1989 MEAN 27.83 LOW 33.19 HIGH 21.33 W 16 O3 Lao 21 Lai tai a.. t) 26 LiJ u.) > uj 31 -J cez 36 ONDJFMAMJJASONDJFMAMJJASONDJFMAMJ JAS 1989 1986 1987 1988 GROUND-WATER LEVELS RIO SALINAS TO RIO JACAGUAS BASINS 180002066132200. Local number, HW-TW-01. LOCATION.--Lat 18°00'02", long 66°13'22". Owner: U.S. Geological Survey, WRD. Name: HW-TW-01. AQUIFER.--Fractured, volcanic rock, water-table aquifer. WELL CHARACTERISTICS.--Drilled observation well, diameter 7 in (0.18 m), 0-39.5 ft (0-12.0 m), cased 4 in (0.10 m), 0-38.2 ft (0-11.6 m), screened 32-37 ft (9.75-11.3 m). Depth 39.5 ft (12.0 m). DATUM.--Elevation of land-surface datum is 190 ft (58.0 m) above mean sea level. Measuring point: Hole on side of 4 in (0.10 m) casing, 2.84 ft (0.87 m) above land-surface datum. Prior October 13, 1988, top of shelter floor, 3.48 ft (1.06 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--April 14, 1988 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 19.82 ft (6.04 m) below land-surface datum, Apr. 14, 1988; lowest water level recorded, 29.02 ft (8.84 m) below land-surface datum, Sept. 11, 1989. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 INSTANTANEOUS OBSERVATION AT 1200 FEB MAR APR MAY JUN JUL AUG SEP 25.25 25.82 26.30 26.95 27.63 28.16 28.50 28.89 25.28 25.82 26.30 26.96 27.66 28.17 28.52 28.90 25.31 25.84 26.30 26.98 27.67 28.18 28.54 28.91 25.35 25.87 26.31 26.99 27.68 28.20 28.56 28.92 25.38 25.89 26.31 27.00 27.69 28.21 28.56 28.93 25.42 25.90 26.30 27.01 27.70 28.21 28.57 28.95 25.43 25.92 26.32 27.02 27.71 28.22 28.60 28.97 25.44 25.94 26.36 27.03 27.72 28.22 28.69 28.98 25.45 25.97 26.41 27.04 27.74 28.23 28.71 28.99 25.48 25.98 26.47 27.05 27.76 28.23 28.71 29.00 25.50 26.00 26.51 27.06 27.78 28.23 28.72 29.01 25.52 26.01 26.54 27.07 27.79 28.23 28.72 29.01 25.55 26.04 26.57 27.09 27.81 28.23 28.72 29.01 25.57 26.06 26.60 27.11 27.83 28.24 28.67 29.01 25.59 26.07 26.62 27.13 27.86 28.25 28.67 29.01 25.61 26.07 26.65 27.15 27.88 28.25 28.66 29.01 25.64 26.09 26.68 27.18 27.90 28.25 28.64 28.99 25.66 26.10 26.69 27.21 27.92 28.26 28.62 28.95 25.70 26.11 26.70 27.23 27.94 28.27 28.62 28.96 25.71 26.12 26.72 27.27 27.96 28.29 28.62 28.95 25.72 26.12 26.73 27.31 27.98 28.30 28.62 28.92 25.74 26.15 26.75 27.35 28.01 28.31 28.64 28.88 25.75 26.16 26.77 27.38 28.02 28.33 28.67 28.83 25.76 26.18 26.79 27.40 28.04 28.34 28.70 28.72 25.77 26.19 26.80 27.43 28.06 28.36 28.73 28.51 25.79 26.21 26.82 27.46 28.08 28.38 28.76 28.36 25.79 26.22 26.84 27.47 28.10 28.39 28.79 28.20 25.81 26.23 26.87 27.51 28.12 28.41 28.82 28.11 26.25 26.91 27.55 28.13 28.44 28.84 28.07 26.27 26.94 27.57 28.14 28.46 28.86 28.03 26.28 27.61 28.48 28.87 25.81 26.28 26.94 27.61 28.14 28.48 28.87 29.01 25.25 25.82 26.30 26.95 27.63 28.16 28.50 28.03 366 DAY OCT 1 22.81 2 22.87 3 22.94 4 22.97 5 22.98 6 23.00 7 23.01 8 23.02 9 23.04 10 23.06 11 23.07 12 23.10 13 23.11 14 23.11 15 23.11 16 23.12 17 23.13 18 23.15 19 23.15 20 23.17 21 23.18 22 23.13 23 23.10 24 23.07 25 23.02 26 22.98 27 22.95 28 22.93 29 22.91 30 22.89 31 22.88 LOW 23.18 HIGH 22.81 NOV DEC JAN 22.90 23.49 24.44 22.90 23.53 24.45 22.92 23.57 24.47 22.92 23.61 24.50 22.93 23.65 24.51 22.94 23.69 24.56 22.96 23.72 24.62 22.98 23.76 24.64 23.00 23.80 24.67 23.04 23.84 24.69 23.06 23.87 24.71 23.07 23.91 24.77 23.09 23.95 24.81 23.13 24.06 24.85 23.16 24.09 24.86 23.18 24.11 24.87 23.21 24.12 24.90 23.22 24.14 24.94 23.23 24.18 24.97 23.24 24.19 24.99 23.26 24.21 25.03 23.27 24.21 25.06 23.28 24.23 25.08 23.30 24.24 25.11 23.31 24.26 25.13 23.32 24.28 25.15 23.34 24.31 25.16 23.38 24.32 25.18 23.41 24.33 25.21 23.45 24.35 25.23 24.37 25.23 23.45 24.37 25.23 22.90 23.49 24.44 WTR YR 1989 MEAN 26.18 LOW 29.01 HIGH 22.81 AMJJ A S 0 N D J FM AMJJ AS 1988 1989 ••• 367 GROUND-WATER LEVELS RIO SALINAS TO RIO JACAGUAS BASINS 180017066132100 Local number, HW-TW-02. LOCATION.--Lat 18'00'17", long 66'13'21". Owner: U.S. Geological Survey, WRD. Name: HW-I4-02. AQUIFER.--Fractured, volcanic rock, water-table aquifer. WELL CHARACTERISTICS.--Drilled observation well, diameter 7 in (0.18 m), 0-74 ft (0-22.6 m), cased 4 in (0.10 m), 0-70 ft (0-21.3 m), screened 60-65 ft (18.3-19.8 m). Depth 74 ft (22.6 m). DATUM.--Elevation of land-surface datum is 224 ft (68.3 m) above mean sea level. Measuring point: Hole on side of 4 in (0.10 m) casing, 3.15 ft (0.96 m) above land-surface datum. Prior October 13, 1988, top of shelter floor, 3.60 ft (1.10 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--March 30, 1988 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 15.44 ft (4.71 m) below land-surface datum, Mar. 30, 1988; lowest water level recorded, 31.54 ft (9.61 m) below land-surface datum, Sept. 30, 1989. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 23.72 24.25 24.81 25.35 26.06 26.80 27.75 28.69 29.59 30.28 31.03 31.24 2 23.75 24.27 24.83 25.37 26.09 26.85 27.78 28.72 29.62 30.36 31.05 31.26 3 23.78 24.29 24.86 25.39 26.11 26.87 27.81 28.75 29.65 30.36 31.07 31.27 4 23.80 24.29 24.88 25.41 26.14 26.90 27.84 28.78 29.68 30.43 31.08 31.28 5 23.82 24.30 24.90 25.42 26.17 26.93 27.88 28.81 29.70 30.43 31.10 31.28 6 23.85 24.32 24.91 25.44 26.19 26.96 27.91 28.83 29.73 30.43 31.11 31.30 7 23.88 24.35 24.91 25.46 26.22 26.99 27.94 28.86 29.76 30.44 31.13 31.32 8 23.90 24.35 24.92 25.48 26.25 27.02 27.98 28.89 29.78 30.44 31.15 31.33 9 23.92 24.37 24.92 25.50 26.28 27.05 28.01 28.92 29.81 30.45 31.16 31.34 10 23.94 24.40 24.93 25.52 26.30 27.07 28.05 28.95 29.83 30.47 31.18 31.35 11 23.96 24.41 24.94 25.54 26.32 27.09 28.07 28.98 29.86 30.48 31.19 31.36 12 23.99 24.43 24.95 25.56 26.35 27.11 28.10 29.01 29.88 30.50 31.21 31.38 13 24.00 24,44 24.95 25.58 26.38 27.15 28.13 29.04 29.90 30.52 31.23 31.39 14 24.00 24.46 25.00 25.59 26.41 27.19 28.16 29.07 29.92 30.62 31.04 31.40 15 24.01 24.48 25.02 25.61 26.43 27.22 28.18 29.10 29.95 30.71 31.04 31.42 16 24.04 24.50 25.04 25.63 26.45 27.24 28.21 29.13 29.98 30.73 31.05 31.43 17 24.07 24.52 25.07 25.65 26.48 27.27 28.25 29.16 30.00 30.75 31.07 31.44 18 24.09 24.54 25.08 25.68 26.51 27.30 28.28 29.19 30.02 30.77 31.08 31.45 19 24.09 24.55 25.10 25.71 26.54 27.31 28.31 29.22 30.04 30.80 31.09 31.47 20 24.11 24.57 25.12 25.73 26.56 27.34 28.34 29.25 30.07 30.82 31.10 31.49 21 24.14 24.59 25.14 25.76 26.60 27.38 28.37 29.28 30.09 30.84 31.11 31.51 22 24.13 24.60 25.16 25.79 26.62 27.43 28.40 29.31 30.12. 30.85 31.12 31.52 23 24.13 24.62 25.18 25.81 26.65 27.47 28.44 29.34 30.15 30.88 31.13 31.53 24 24.14 24.64 25.20 25.84 26.68 27.50 28.47 29.38 30.17 30.91 31.15 31.51 25 24.14 24.66 25.22 25.87 26.70 27.52 28.50 29.40 30.19 30.92 31.15 31.49 26 24.15 24.69 25.24 25.90 26.73 27.54 28.52 29.43 30.21 30.94 31.17 31.48 27 24.16 24.71 25.25 25.92 26.75 27.60 28.55 29.46 30.23 30.95 31.18 31.48 28 24.18 24.74 25.27 25.95 26.77 27.64 28.59 29.49 30.26 30.97 31.19 31.50 29 24.19 24.76 25.29 25.98 27.66 28.62 29.52 30.27 30.99 31.20 31.52 30 24.21 24.79 25.31 26.00 27.68 28.66 29.55 30.28 31.00 31.22 31.53 31 24.22 25.33 26.03 27.72 29.57 31.02 31.23 LOW 24.22 24.79 25.33 26.03 26.77 27.72 28.66 29.57 30.28 31.02 31.23 31.53 HIGH 23.72 24.25 24.81 25.35 26.06 26.80 27.75 28.69 29.59 30.28 31.03 31.24 WTR YR 1989 MEAN 27.79 LOW 31.53 HIGH 23.72 o 14 1E4 4t La ,A.o 20 La w Z ">I v? 26 ctZ< 32 M A M J J A SONDJ FM A M J J AS 1988 1989 388 GROUND-WATER LEVELS RIO SALINAS TO RIO JACAGUAS BASINS 180001066122000 Local number, HW-TW-03. LOCATION.--Lat 18°00'01", long 66-12'20". Owner: U.S. Geological Survey, WRD. Name: HW-TW-03. AQUIFER.--Fractured, volcanic rock, water-table aquifer. WELL CHARACTERISTICS:--Drilled observation well, diameter 7 in (0.18 m), 0-60 ft (0-18.3 m), cased 4 in (0.10 m), 0-59 ft (0-18.0 m), screened 53-58 ft (16.2-17.7 m). Depth 60 ft (18.3 m). DATUM.--Elevation of land-surface datum is 271 ft (82.6 m) above mean sea level. Measuring point: Hole on side of 4 in (0.10 m) casing, 3.11 ft (0.95 m) above land-surface datum. Prior October 14, 1989, top of shelter floor, 3.42 ft (1.04 m) above land-surface datum. REMARKS.--Recording observation well. Aquifer test on Dec. 7, 1988 and May 24-25, 1989. PERIOD OF RECORD.--March 31, 1988 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 23.68 ft (7.22 m) below land-surface datum, Mar. 31, 1988; lowest water level recorded, 53.17 ft (16.2 m) below land-surface datum, Sept. 29-30, 1989. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 46.54 46.89 46.54 47.00 47.88 48.85 50.04 50.77 51.32 52.90 2 46.57 46.88 46.54 47.02 47.90 48.88 50.07 50.80 51.47 52.90 3 46.59 46.84 46.55 47.04 47.91 48.91 50.09 50.82 51.52 52.91 4 46.63 46.79 46.55 47.06 47.95 48.92 50.11 50.85 51.51 52.93 5 46.65 46.70 46.55 47.09 47.98 48.93 50.12 50.88 51.51 52.94 6 46.67 46.68 46.56 47.11 48.01 48.98 50.18 50.89 51.51 52.94 7 46.71 46.59 46.56 47.12 48.05 49.00 50.25 50.90 51.50 52.95 8 46.73 46.59 46.59 47.16 48.07 49.00 50.25 51.06 51.49 52.96 9 46.75 46.58 46.65 47.18 48.16 49.05 50.25 51.08 51.50 52.99 10 46.78 46.57 46.67 47.21 48.16 49.09 50.29 51.08 --- 53.00 11 46.80 46.56 46.71 47.23 48.17 49.11 50.31 51.13 53.03 12 46.83 46.56 46.72 47.27 48.18 49.12 50.33 51.18 53.03 13 46.84 46.50 46.74 41.31 48.23 49.18 50.35 51.22 53.04 14 46.88 46.51 46.75 47.29 48.26 49.42 50.38 51.27 53.05 15 46.85 46.49 46.77 47.33 48.28 49.42 50.39 51.31 53.06 16 46.85 46.48 46.78 47.36 48.31 49.48 50.41 51.36 52.62 53.08 17 46.87 46.49 46.79 47.38 48.36 49.51 50.43 51.41 52.65 53.08 18 46.88 46.49 46.80 47.38 48.39 49.57 50.46 51.46 52.67 53.07 19 46.87 46.49 46.82 47.43 48.44 49.59 50.48 51.51 52.70 53.10 20 46.89 46.50 46.82 47.45 48.47 49.62 50.50 51.56 52.72 53.13 21 46.89 46.50 46.83 47.46 48.52 49.67 50.52 51.61 52.75 53.13 22 46.89 46.51 46.84 47.59 48.56 49.71 50.56 51.66 52.77 53.13 23 46.93 46.51 46.85 47.61 48.69 49.77 50.59 51.70 52.79 53.14 24 46.93 46.51 46.87 47.63 48.71 49.79 50.60 51.76 52.80 53.15 25 46.94 46.52 46.88 47.63 48.73 49.83 50.64 --- 52.82 53.15 53.15 27 46.93 46.52 46.91 47.63 48.75 49.90 50.68 26 46.94 46.52 46.89 47.62 48.73 49.88 50.67 --- 52.83 50.84 52.84 53.15 28 46.94 46.53 46.92 47.74 48.83 49.91 50.70 50.91 52.85 53.16 29 46.93 46.53 46.96 47.78 --- 49.96 50.72 51.05 52.86 53.17 30 46.92 46.54 46.98 47.81 49.98 50.77 51.10 52.87 53.17 31 46.90 --- 46.99 47.82 49.99 --- 51.17 52.88 --- 53.17 HIGH 46.54 46.48 46.54 47.00 41.88 48.85 50.04 LOW 46.94 46.89 46.99 47.82 48.83 49.99 50.77 52.90 20 I- 29 La w u. c.) z .cf •14; 38 -J IA I 47 -J mz Lit < I- -I 4 56 AMJJ A S 0 N D J FM AMJJ AS 1988 1989 369 GROUND-WATER LEVELS RIO SALINAS TO RIO JACAGUAS BASINS 180001066122002 Local number, HW-TW-03C. LOCATION.--Lat 18°00'01", long 66°12'20". Owner: U.S. Geological Survey, WRD. Name: HW-TW-03C. AQUIFER.--Fractured, volcanic rock, water-table aquifer. WELL CHARACTERISTICS.--Drilled observation well, diameter 7 in (0.18 m), 0-220 ft (0-67.0 m), cased 4 in (0.10 m), 0-150 ft (0-45.7 m), open hole 150-220 ft (49%7-67.0 m). Depth 220 ft (67.0 m). DATUM.--Elevation of land-surface datum is 270 ft (82.6 m) above mean sea level. Measuring point: Top of shelter floor, 3.32 ft (1.01 m) above land-surface datum. REMARKS.--Recording observation well. Automatic digital recorder installed on Dec. 15, 19B8. Aquifer test performed during May 24, 25-26, 1989. PERIOD OF RECORD.--December 15, 1988 to September 30, 1989 EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 48.87 ft (14.9 m) below land-surface datum, Jan. 8, 1989; lowest water level recorded, 54.15 ft (16.5 m) below land-surface datum, Aug. 18, 1989. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 48.94 49.52 50.11 50.76 51.26 52.55 52.10 53.05 53.06 2 48.95 49.59 50.12 50.83 51.32 52.54 52.12 53.10 53.05 3 48.96 49.62 50.17 50.86 51.38 52.53 52.15 53.15 53.03 4 48.97 49.67 50.23 50.90 51.38 52.53 52.17 53.20 53.00 5 49.00 49.71 50.28 50.93 51.39 52.52 52.20 53.25 52.97 6 49.05 49.73 50.35 50.95 51.38 52.51 52.22 53.30 52.97 7 49.06 49.76 50.37 50.93 51.37 52.50 52.24 53.35 52.99 8 49.04 49.75 50.41 50.92 51.37 --- 52.26 53.39 53.06 9 49.03 49.74 50.40 50.92 51.39 --- 52.28 53.44 53.08 10 49.04 49.74 50.37 50.94 51.35 51.45 52.31 53.49 53.11 11 49.03 49.76 50.37 50.93 51.34 51.47 52.33 53.54 53.15 12 49.03 49.78 50.39 50.94 51.33 51.49 52.35 53.60 53.20 13 49.01 49.82 50.40 50.95 51.34 51.52 52.37 53.66 53.23 14 49.07 49.83 50.41 50.96 51.36 51.54 52.39 53.73 53.25 15 49.09 49.81 50.44 51.00 51.40 51.57 52.41 53.80 53.26 16 49.68 49.10 49.85 50.46 51.04 51.43 51.59 52.44 54.05 53.22 17 49.65 49.15 49.87 50.50 51.08 51.45 51.62 52.47 54.10 53.15 18 49.60 49.18 49.90 50.55 51.08 51.48 51.66 52.49 54.15 52.91 19 49.43 49.21 49.94 50.57 51.07 51.48 51.68 52.52 53.92 53.06 20 49.37 49.22 49.97 50.60 51.07 51.48 51.71 52.56 53.68 53.09 21 49.33 49.27 49.98 50.61 51.09 51.47 51.73 52.59 53.43 53.13 22 49.28 49.31 49.99 50.63 51.10 51.48 51.75 52.62 53.19 53.10 23 49.24 49.40 49.98 50.65 51.11 51.48 51.77 52.64 52.90 53.08 24 49.19 49.41 49.99 50.68 51.10 51.48 51.80 52.66 52.91 52.99 25 49.16 49.41 49.97 50.68 51.11 51.82 52.68 52.95 53.01 26 49.14 49.43 49.96 50.65 51.10 --- 51.84 52.73 53.00 53.02 27 49.11 49.43 50.00 50.66 51.11 52.41 51.87 52.78 53.05 53.03 28 49.01 49.44 50.06 50.69 51.12 52.41 51.93 52.83 53.07 53.02 29 48.99 49.44 --- 50.71 51.19 52.54 52.06 52.88 53.07 53.06 30 48.96 49.46 50.71 51.21 52.57 52.08 52.93 53.06 53.04 31 48.95 49.49 50.72 --- 52.56 --- 52.98 53.07 --- LOW 49.49 50.06 50.72 51.21 52.98 54.15 53.26 HIGH 48.94 49.52 50.11 50.76 52.10 52.90 52.91 948 'et 1- 4 W O W ZL4C „.1 52 cmZ 56 DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1988 1989 370 GROUND-WATER LEVELS RIO SALINAS TO RIO JACAGUAS BASINS 180001066122004 Local number, HW-TW-03E. LOCATION.--Lat 18°00'01", long 66°12'20". Owner: U.S. Geological Survey, WRD. Name: HW-TW-03E. AQUIFER.--Fractured, volcanic rock, water-table aquifer. WELL CHARACTERISTICS.--Drilled observation well, diameter 7 in (0.18 m),_0-70 ft (0.27.4 m), cased 4 in (0.10 m), 0-89 ft (0-27.1 m), screened 79-89 ft (24.1-27.1 m). Depth 90 ft (27.4 m). DATUM.--Elevation of land-surface datum is 271 ft (82.6 m) above mean sea level. Measuring point: Top of shelter floor, 3.08 ft (0.94 m) above land-surface datum. REMARKS.--Recording observation well. Automatic digital recorder installed on December 1988. Aquifer test performed on May 24, 25, and 26, 1989. PERIOD OF RECORD.--December 15, 1988 to September 30, 1989. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 46.05 ft (14.0 m) below land-surface datum, Dec. 15-16, 1988; lowest water level recorded, 50.07 ft (15.3 m) below land-surface datum, Sept. 23-24, 1989. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 46.32 46.95 47.48 47.89 48.38 49.63 49.94 2 46.35 46.99 47.51 47.89 48.39 49.64 49.93 3 46.37 47.01 47.53 47.90 48.41 49.64 49.94 4 46.40 47.03 47.55 47.90 48.42 49.64 49.94 5 46.42 47.06 47.55 47.92 48.44 49.64 49.94 6 46.46 47.09 47.58 47.94 48.45 49.64 49.94 7 46.49 --- 47.58 48.08 48.47 49.64 49.95 8 46.53 --- 47.60 48.09 48.48 49.65 49.96 9 46.58 47.12 47.63 48.10 48.49 --- 49.65 49.97 10 46.60 47.13 47.69 48.12 48.49 49.60 49.65 49.99 11 46.62 47.13 47.72 48.13 48.49 49.60 49.65 50.00 12 46.63 47.14 48.14 48.49 49.61 49.65 49.99 13 46.65 47.17 48.15 48.50 49.61 49.66 50.00 14 46.65 47.19 47.73 48.16 48.50 49.61 49.67 50.00 15 46.66 47.20 47.73 48.17 48.50 49.61 49.68 50.01 16 46.05 46.68 47.22 47.75 48.18 48.50 49.61 49.68 49.85 50.01 17 46.05 46.70 47.22 47.76 48.19 48.50 49.62 49.68 49.86 50.01 18 46.06 46.70 47.24 47.77 48.20 48.50 49.62 49.70 49.86 49.95 19 46.08 46.71 47.26 47.78 48.23 48.50 49.62 49.70 49.87 50.02 20 46.10 46.71 47.28 47.80 48.24 48.50 49.62 49.70 49.88 50.05 21 46.12 46.74 47.29 47.80 48.25 48.51 49.61 49.71 49.88 50.05 22 46.13 46.81 47.31 47.82 48.26 48.52 49.62 49.71 49.90 50.06 23 46.15 46.84 47.38 47.82 48.27 48.52 49.62 49.73 49.91 50.07 24 46.16 46.86 47.41 47.83 48.28 48.53 49.62 49.73 49.90 50.07 25 46.18 46.86 47.43 47.83 48.29 49.62 49.91 50.06 26 46.19 46.87 47.43 47.84 48.31 49.62 49.91 49.98 27 46.21 46.88 47.46 47.84 48.33 49.63 49.92 49.92 28 46.24 46.89 47.47 47.85 48.34 49.63 49.92 49.88 29 46.25 46.90 --- 47.86 48.35 49.63 49.93 49.84 30 46.27 46.92 47.86 48.37 49.63 49.93 49.81 31 46.29 46.93 47.87 --- --- 49.93 --- LOW 46.93 48.37 50.07 HIGH 46.32 47.89 49.81 0 45 LCO < 0 w 47 La z 49 >(f) W I -J Z aJ 51 DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1988 1989 371 GROUND-WATER LEVELS RIO SALINAS TO RIO JACAGUAS BASINS 180000066125200 Local number, HW-TW-04. LOCATION,--Lat 18°00'00", long 66 - 12'52". Owner: U.S. Geological Survey, WRD. Name: HW-TW-04. AQUIFER.--Fractured, volcanic rock, water-table aquifer. WELL CHARACTERISTICS.--Drilled observation well, diameter 7 in (0.18 m), 0-48.5 ft (0-14.8 m) cased 4 in (0.10 m), 0-48 ft (0-14.6 m), screened 42-47 ft (12.8-14.3 m). Depth 48.5 ft (14.8 m). DATUM.--Elevation of land-surface datum is 177 ft (53.9 m) above mean sea level. Measuring point: Hole on side of casing, 2.69 ft (0.82 m) above land-surface datum. Prior October 13, 1989 top of shelter floor, 3.50 ft (1.07 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--April 5, 1988 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 18.39 ft (5.60 m) below land-surface datum, Apr. 5, 1988; lowest water level recorded, 25.96 ft (7.91 m) below land-surface datum, Sept. 22-23, 1989. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 20.94 20.22 20.85 22.00 22.78 23.14 23.49 23.94 24.36 24.69 25.11 25.60 2 20.98 20.20 20.89 22.03 22.81 23.15 23.50 23.96 24.37 24.70 25.13 25.61 3 21.03 20.15 20.93 22.06 22.82 23.17 23.51 23.98 24.39 24,71 25.14 25.63 4 21.06 20.13 20.97 22.08 22.83 23.19 23.54 24.00 24.39 24.73 25.16 25.64 5 21.08 20.12 21.01 22.12 22.85 23.20 23.54 24.02 24.40 24.74 25.17 25.66 6 21.11 20.12 21.05 22.15 22.86 23.22 23.54 24.03 24.41 24.76 25.19 25.67 7 21.12 20.12 21.09 22.17 22.87 23.23 23.54 24.05 24.44 24.78 25.21 25.69 8 21.14 20.14 21.12 22.20 22.88 23.25 23.55 24.07 24.44 24.78 25.22 25.71 9 21.15 20.18 21.15 22.23 22.90 23.26 23.57 24.09 24.45 24.80 25.24 25.72 10 21.17 20.22 21.19 22.26 22.91 23.27 23.58 24.11 24.47 24.82 25.27 25.74 11 21.20 20.23 21.24 22.29 22.92 23.30 23.58 24.11 24.47 24.83 25.28 25.76 12 21.22 20.25 21.27 22.32 22.93 23.31 23.59 24.12 24.50 24.84 25.30 25.78 13 21.24 20.28 21.33 22.34 22.94 23.32 23.61 24.13 24.50 24.85 25.31 25.80 14 21.24 20.32 21.35 22.37 22.96 23.33 23.62 24.14 24.51 24.86 25.33 25.82 15 21.24 20.34 21.39 22.40 22.98 23.35 23.64 24.16 24.52 24.87 25.36 25.84 16 21.26 20.37 21.43 22.42 22.99 23.35 23.66 24.18 24.52 24.88 25.36 25.86 17 21.28 20.40 21.47 22.47 23.00 23.36 23.67 24.19 24.53 24.89 25.37 25.88 18 21.30 20.42 21.51 22.48 23.01 23.37 23.70 24.20 24.54 24.91 25.39 25.90 19 21.31 20.45 21.54 22.51 23.02 23.37 23.71 24.21 24.55 24.92 25.41 25.92 20 21.32 20.49 21.57 22.52 23.03 23.38 23.73 24.22 24.56 24.94 25.42 25.93 21 21.33 20.51 21.60 22.55 23.04 23.39 23.74 24.23 24.57 24.95 25.44 25.94 22 21.30 20.54 21.64 22.58 23.05 23.40 23.76 24.24 24.58 24.96 25.45 25.96 23 21.25 20.58 21.68 22.61 23.07 23.42 23.79 24.25 24.58 24.97 25.47 25.95 24 21.09 20.61 21.72 22.63. 23.08 23.43 23.81 24.26 24.60 24.98 25.49 25.50 25 20.86 20.64 21.76 22.65 23.09 23.43 23.83 24.28 24.62 25.01 25.51 25.15 26 20.67 20.68 21.79 22.67 23.10 23.44 23.85 24.29 24.63 25.02 25.51 24.93 27 20.54 20.70 21.84 22.69 23.11 23.45 23.87 24.31 24.64 25.03 25.53 24.74 28 20.43 20.73 21.87 22.71 23.12 23.46 23.89 24.32 24.66 25.05 25.54 24.62 29 20.36 20.77 21.90 22.74 23.48 23.91 24.33 24.67 25.06 25.55 24.49 30 20.29 20.81 21.94 22.76 23.48 23.93 24.34 24.67 25.08 25.57 24.38 31 20.25 21.97 22.77 23.49 24.35 25.10 25.59 LOW 21.33 20.81 21.97 22.17 23.12 23.49 23.93 24.35 24.67 25.10 25.59 25.96 HIGH 20.25 20.12 20.85 22.00 22.78 23.14 23.49 23.94 24.36 24.69 25.11 24.38 WTR YR 1989 MEAN 23.31 LOW 25.96 HIGH 20.12 O 18 ai < W • w 21 U Z > Lai cn 24 W Ici Z W < .c J 27 AMJ J A S 0 ND J FM A M J J A S 1988 1989 L 372 GROUND-WATER LEVELS RIO SALINAS TO RIO JACAGUAS BASINS 175947066130601 Local number, HW-TW-058. LOCATION.--Lat 17°59'47", long 66'13 1 06". Owner: U.S. Geological Survey, WRD. Name: HW-TW-05B. AQUIFER.--Fractured, volcanic rock, water-table aquifer. WELL CHARACTERISTICS.--Drilled observation well, diameter 7 in (0.18 m), 0-52 ft (0-15.8 m), cased 4 in (0.10 m), 0-51 ft (0-15.5 m), screened 41-46 ft (12.5-14.0 m). Depth 52 ft (15.8 m). DATUM.--Elevation of land-surface datum is 145 ft (44.2 m) above mean sea level. Measuring point: Hole on side of casing, 3.00 ft (0.91 m) above land-surface datum. Prior October 13, 1989 top of shelter floor, 3.47 ft (1.06 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--April 13, 1988 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 9.40 ft (2.86 m) below land-surface datum, Aug. 25, 1988; lowest water level recorded, 18.24 ft (5.56 m) below land-surface datum, Sept. 17-18, 1989. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 12.66 11.73 12.99 14.76 15.59 15.88 16.42 16.87 17.07 17.52 17.84 18.03 2 12.74 11.74 13.08 14.80 15.62 15.90 16.39 16.88 17.07 17.54 17.85 18.05 3 11.92 11.83 13.12 14.85 15.62 15.93 16.37 16.89 17.07 17.54 17.84 18.08 4 11.97 11.88 13.18 14.88 15.64 15.95 16.38 16.90 17.07 17.56 17.83 18.09 5 11.96 11.92 13.27 14.93 15.64 15.97 16.38 16.91 17.08 17.57 17.83 18.11 6 11.98 11.95 13.36 14.97 15.67 15.99 16.39 16.93 17.10 17.58 17.84 18.13 7 12.03 11.99 13.45 15.02 15.68 16.01 16.41 16.94 17.12 17.58 17.84 18.14 8 12.07 12.03 13.55 15.05 15.70 16.04 16.42 16.95 17.16 17.56 17.84 18.16 9 12.12 12.06 13.66 15.10 15.74 16.06 16.45 16.96 17.19 17.54 17.83 18.17 10 12.16 12.10 13.72 15.15 15.75 16.07 16.46 16.97 17.19 17.54 17.84 18.18 11 12.20 12.12 13.78 15.19 15.75 16.07 16.46 16.97 17.23 17.54 17.84 18.19 12 12.27 12.15 13.83 15.23 15.77 16.07 16.47 16.97 17.23 17.55 17.77 18.20 13 12.26 12.20 13.90 15.26 15.79 16.08 16.49 16.97 17.24 17.56 17.69 18.21 14 12.28 12.22 13.96 15.29 15.81 16.08 16.52 16.97 17.26 17.58 17.67 18.22 15 12.33 12.27 14.01 15.34 15.82 16.08 16.54 16.97 17.28 17.62 17.67 18.22 16 12.37 12.33 14.07 15.38 15.82 16.09 16.56 16.97 17.30 17.64 17.70 18.22 17 12.43 12.26 14.11 15.43 15.82 16.12 16.57 16.97 17.32 17.66 17.72 18.24 18 12.49 12.16 14.13 15.43 15.80 16.14 16.58 16.97 17.33 17.68 17.77 18.20 19 12.54 12.23 14.18 15.45 15.80 16.16 16.59 16.97 17.35 17.70 17.80 18,15 20 12.62 12.29 14.22 15.50 15.79 16.19 16.61 16.97 17.37 17.72 17.85 18.11 21 11.47 12.34 14.28 15.53 15,79 16.20 16.64 16.98 17.38 17.75 17.88 18.10 22 11.41 12.41 14.34 15.53 15.79 16.22 16.67 17.01 17.39 17.77 17.90 17.59 23 11.52 12.42 14.39 15.53 15.79 16.24 16.70 17.01 17.41 17.79 17.94 16.13 24 10.81 12.46 14.46 15.53 15.80 16.27 16.72 17.02 17.43 17.79 17.96 12.70 25 10.92 12.50 14.50 15.53 15.81 16.29 16.76 17.05 17.44 17.81 17,94 12.94 26 11.03 12.55 14.53 15.54 15.82 16.32 16.78 17.07 17.45 17.80 17.95 13.22 27 11.16 12.62 14.58 15.56 15.84 16.35 16.80 17.07 17.47 17.80 17.97 13.45 28 11.31 12.72 14.63 15.56 15.86 16.38 16.82 17.07 17.48 17.82 17.98 13.62 29 11.42 12.81 14.68 15.56 16.41 16.86 17.07 17.50 17.83 18.00 13.78 30 11.54 12.90 14.70 15.56 16.42 16.87 17.07 17.51 17.84 18.00 13.90 31 11.64 14.72 15.56 16.42 17.07 17.84 18.01 LOW 12.74 12.90 14.72 15.56 15.86 16.42 16.87 17.07 17.51 17.84 18.01 18.24 HIGH 10.81 11.73 12.99 14.76 15.59 15.88 16.37 16.87 17.07 17.52 17.67 12.70 WTR YR 1989 MEAN 15.72 LOW 18.24 HIGH 10.81 AMJJ A S 0 N D J F M A M J J AS 1988 1989 373 GROUND-WATER LEVELS RIO SALINAS TO RIO JACAGUAS BASINS 180006066123700 Local number, HW-TW-07. LOCATION.--Lat 18°00'06", long 66'12'37". Owner: U.S. Geological Survey, WRD. Name: HW-TW-07. AQUIFER.--Fractured, volcanic rock, water-table aquifer. WELL CHARACTERISTICS.--Drilled observation well, diameter 7 in (0.18 m), 0-88 ft (0-26.8 m), cased 4 in (0.10 m), 0-82 ft (0-25.0 m), screened 69-77 ft (21.0-29.5 m). Depth 88 ft (26.8 m). DATUM.--Elevation of land-surface datum is 240 ft (73.2 m) above mean sea level. Measuring point: Hole on side of casing, 2.99 ft (0.91 m) above land-surface datum. Prior October 13, 1988 top of shelter floor, 3.48 ft (1.06 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--April 1988 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 23.79 ft (7.25 m) below land-surface datum, Apr. 1, 1988; lowest water level recorded, 34.82 ft (10.6 m) below land-surface datum, Sept. 20. 1989. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 29.85 29.57 29.98 30.97 31.84 32.13 32.69 33.12 33.35 33.16 34.17 34.59 2 29.90 29.55 30.04 31.00 31.85 32.14 32.11 33.13 33.36 33.78 34.19 34.61 3 29.94 29.53 30.07 31.02 31.87 32.15 32.74 33.14 33.38 33.80 34.19 34.62 4 29.96 29.51 30.11 31.06 31.88 32.15 32.76 33.14 33.39 33.81 34.22 34.63 5 29.98 29.48 30.14 31.10 31.89 32.16 32.79 33.14 33.41 33.83 34.23 34.64 6 30.01 29.48 30.19 31.13 31.90 32.17 32.83 33.15 33.42 33.84 34.24 34.65 7 30.05 29.48 30.22 31.15 31.92 32.18 32.86 33.15 33.43 33.84 34.25 34.66 8 30.07 29.49 30.25 31.18 31.93 32.19 32.86 33.14 33.43 33.85 34.26 34.67 9 30.09 29.49 30.28 31.21 31.94 32.20 32.88 33.15 33.44 33.86 34.28 34.69 10 30.12 29.51 30.33 31.23 31.95 32.21 32.89 33.14 33.46 33.87 34.28 34.70 11 30.15 29.52 30.36 31.27 31.97 32.22 32.89 33.14 33.47 33.88 34.30 34.71 12 30.17 29.53 30.38 31.30 31.98 32.23 32.90 33.15 33.49 33.89 34.31 34.73 13 30.20 29.54 30.44 31.33 31.99 32.24 32.91 33.16 33.51 33.90 34.33 34.74 14 30.22 29.55 30.45 31.35 31.99 32.25 32.92 33.17 33.52 33.91 34.34 34.76 15 30.24 29.57 30.46 31.38 32.00 32.28 32.94 33.18 33.53 33.92 34.36 34.78 16 30.26 29.59 30.54 31.40 32.01 32.30 32.96 33.19 33.55 33.94 34.37 34.79 17 30.27 29.62 30.57 31.43 32.02 32.33 32.97 33.20 33.55 33.96 34.37 34.79 18 30.29 29.63 30.60 31.47 32.03 32.35 32.99 33.22 33.58 33.97 34.37 34.79 19 30.32 29.65 30.63 31.53 32.04 32.37 33.01 33.23 33.60 33.99 34.37 34.81 20 30.37 29.67 30.66 31.56 32.05 32.39 33.01 33.24 33.61 34.00 34.39 34.80 21 30.37 29.70 30.70 31.60 32.06 32.42 33.02 33.25 33.63 34.02 34.39 34.81 22 30.36 29.73 30.72 31.63 32.07 32.44 33.04 33.26 33.64 34.03 34.40 34.81 23 30.35 29.75 30.75 31.67 32.07 32.46 33.05 33.27 33.65 34.04 34.44 34.74 24 30.25 29.77 30.78 31.69 32.08 32.48 33.06 33.28 33.66 34.04 34.44 34.19 25 30.12 29.81 30.81 31.11 32.09 32.51 33.07 33.28 33.67 34.07 34.48 33.99 26 29.98 29.83 30.83 31.73 32.10 32.53 33.08 33.29 33.68 34.08 34.50 33.89 27 29.89 29.85 30.85 31.76 32.11 32.56 33.09 33.29 33.70 34.10 34.51 33.81 28 29.80 29.89 30.87 31.17 32.12 32.59 33.10 33.30 33.71 34.12 34.53 33.78 29 29.71 29.92 30.90 31.79 32.61 33.12 33.31 33.73 34.13 34.55 33.76 30 29.65 29.95 30.93 31.80 32.64 33.12 33.32 33.75 34.15 34.57 33.68 31 29.61 30.95 31.82 32.66 33.33 34.16 34.58 LOW 30.37 29.95 30.95 31.82 32.12 32.66 33.12 33.33 33.75 34.16 34.58 34.81 HIGH 29.61 29.48 29.98 30.97 31.84 32.13 32.69 33.12 33.35 33.76 34.17 33.68 WTR YR 1989 MEAN 32.38 LOW 34.81 HIGH 29.48 3: 9:E 21 gl cl 25 WU zA .(xii; 29 N ca 33 l z 4 37 M A M J JASOND J FM A M J J AS 1988 1989 374 GROUND-WATER LEVELS RIO SALINAS TO RIO JACAGUAS BASINS 175939066121400 Local number, HW-TW-08. LOCATION.--Lat 17°59'39", long 66'12'14". Owner: U.S. Geological Survey, WRD. Name: HW-TW-08. AQUIFER.--Fractured, volcanic rock, water-table aquifer. WELL CHARACTERISTICS.--Orilled observation well, diameter 7 in (0.18 m), 0-49 ft (0-14.9 m ), cased 4 in (0.10 m), 0-49 ft (0-14.9 m), screened 43-48 ft (13.1-14.6 m). Depth 49 ft (14.9 m). DATUM.--Elevation of land-surface datum is 172 ft (52.4 m) above mean sea level. Measuring point: Hole on side of casing, 2.83 ft (0.86 m) above land-surface datum. Prior October 7, 1988 top of shelter floor, 3.55 ft (1.08 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--April 13, 1988 to curret year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 12.55 ft (3.82 m) below land-surface datum, Apr. 13, 1988; lowest water level recorded, 41.23 ft (12.6 m) below land-surface datum, Sept. 21,22-23, 1989. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 29.13 30.33 29.30 30.52 32.39 34.19 36.03 37.50 38.75 39.84 40.83 40.89 2 29.20 30.31 29.30 30.57 32.46 34.26 36.09 37.55 38.77 39.84 40.86 40.92 3 29.27 30.29 29.31 30.62 32.52 34.32 36.15 37.61 38.81 39.93 40.88 40.94 4 29.33 30.24 29.33 30.68 32.58 34.38 36.20 37.65 38.83 39.96 40.88 40.96 5 29.40 30.20 29.35 30.73 32.64 34.44 36.26 37.68 38.95 39.98 40.92 40.97 6 29.48 30.16 29.37 30.78 32.72 34.49 36.31 37.73 38.97 40.01 40.93 41.00 7 29.56 30.12 29.39 30.83 32.78 34.55 36.36 37.81 39.00 40.04 40.94 41.00 8 29.60 30.07 29.41 30.88 32.85 34.63 36.41 37.84 39.02 40.05 40.95 41.04 9 29.66 30.02 29.45 30.95 32.92 34.68 36.46 37.92 39.09 40.10 40.95 41.04 10 29.72 29.96 29.47 30.99 32.97 34.73 36.50 37.94 39.12 40.14 40.97 41.06 11 29.78 29.91 29.51 31.07 33.04 34.79 36.55 37.99 39.15 40.16 40.99 41.08 12 29.83 29.84 29.54 31.13 33.10 34.86 36.59 38.03 39,19 40.19 41.01 41.09 13 29.89 29.80 29.57 31.21 33.17 34.91 36.65 38.05 39.20 40.20 41.02 41.13 14 29.95 29.76 29.61 31.26 33.24 34.97 36.70 38.10 39.24 40.23 41.02 41.13 15 30.01 29.71 29.67 31.32 33.28 35.03 36.74 38.16 39.29 40.26 41.07 41.14 16 30.08 29.67 29.70 31.39 33.34 35.09 36.79 38.18 39.33 40.27 40.97 41.15 17 30.14 29.62 29.74 31.45 33.42 35.16 36.85 38.22 39.35 40.31 40.97 41.17 18 30.20 29.58 29.78 31.51 33.48 35.22 36.90 38.27 39.37 40.34 40.97 41.19 19 30.26 29.54 29.83 31.57 33.54 35.28 36.94 38.29 39.41 40.38 40.97 41.20 20 30.33 29.51 29.88 31.62 33.61 35.33 36.98 38.31 39.42 40.39 40.97 41.22 21 30.39 29.46 29.92 31.69 33.69 35.39 37.06 38.32 39.45 40.41 40.97 41.22 22 30.42 29.42 29.97 31.74 33.74 35.46 37.10 38.41 39.47 40,43 40.98 41.23 23 30.44 29.39 30.02 31.81 33.80 35.53 37.16 38.44 39.55 40.45 41.01 41.23 24 30.45 29.35 30.08 31.88 33.86 35.57 37.19 38.46 39.57 40.48 41.03 41.14 25 30.44 29.34 30.14 31.93 33.92 35.63 37.25 38.48 39.62 40.70 40.85 41.03 26 30.41 29.33 30.18 31.99 33.98 35.69 37.29 38.49 39.63 40.70 40.83 40.98 27 30.40 29.32 30.24 32.07 34.05 35.74 37.34 38.58 39.72 40.71 40.85 40.94 28 30.39 29.32 30.29 32.13 34.13 35.80 37.36 38.60 39.75 40.72 40.85 40.91 29 30.37 29.30 30.35 32.19 35.86 37.41 38.61 39.76 40.74 40.85 40.86 30 30.36 29.31 30.41 32.27 35.91 37.47 38.68 39.78 40.76 40.86 40.83 31 30.34 30.47 32.33 35.98 38.70 40.80 40.88 LOW 30.45 30.33 30.47 32.33 34.13 35.98 37.47 38.70 39.78 40.80 41.07 41.23 HIGH 29.13 29.30 29.30 30.52 32.39 34.19 36.03 37.50 38.75 39.84 40.83 40.83 WTR YR 1989 MEAN 35.48 LOW 41.23 HIGH 29.13 AMJJ A SONDJ FM APAJJ AS 1988 1989 375 GROUND-WATER LEVELS RIO SALINAS TO RIO JACAGUAS BASINS 175950066125200 Local number, HW-TW-10. LOCATION.--Lat 17'59'50", long 66°12'52". Owner: U.S. Geological Survey, WRD. Name: HW-TW-10. AQUIFER.--Fractured, volcanic rock, water-table aquifer. WELL CHARACTERISTICS-.--Drilled observation well, diameter 7 in (0.18 m), 0-55 ft (0-16.8 m), cased 4 in (0.10 m), 0-54 ft (0-16.4 m), screened 48-53 ft (14.6-16.2 m). Depth 55 ft (16.8 m). DATUM.--Elevation of land-surface datum is 159 ft (48.5 m) above mean sea level. Measuring point: Hole on side of casing, 2.98 ft (0.91 m) above land-surface datum. Prior October 14, 1988 top of shelter floor, 3.61 ft (1.10 m) above land-surface datum. REMARKS.--Recording observation well. Pumping test on Dec. 8, 1988, May 22, 1989, and July 13, 1989. PERIOD OF RECORD.--April 5, 1988 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 21.39 ft (6.52 m) below land-surface datum, Apr. 5, 1988; lowest water level recorded, 27.52 ft (8.39 m) below land-surface datum, Sept. 21, 1989. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 23.87 23.19 23.45 24.45 25.27 25.65 26.07 26.37 26.47 26.67 27.02 27.29 2 23.90 23.17 23.49 24.49 --- 25.67 26.08 26.37 26.47 26.69 27.02 27.28 3 23.91 23.15 23.52 24.52 25.68 26.11 26.37 26.47 26.69 27.03 27.29 4 23.89 23.12 23.54 24.55 25.70 26.12 26.37 26.46 26.70 27.03 27.30 5 23.89 23.10 23.58 24.59 25.71 26.13 26.36 26.47 26.71 27.04 27.30 6 23.90 23.10 23.61 24.62 25.36 25.73 26.13 26.36 26.47 26.73 27.05 27.32 7 23.91 23.09 23.64 24.65 25.37 25.74 26.14 26.36 26.47 26.73 27.06 27.32 8 23.91 23.07 24.03 24.68 25.38 25.76 26.17 26.36 26.47 26.74 27.06 27.34 9 23.92 23.07 23.79 24.72 25.40 25.77 26.18 26.35 26.48 26.74 27.07 27.36 10 23.93 23.08 23.81 24.75 25.36 25.79 26.19 26.35 26.47 26.76 27.09 27.38 11 23.94 23.08 23.83 24.79 25.38 25.80 26.19 26.34 26.48 26.76 27.10 27.40 12 23.96 23.09 23.86 24.81 25.39 25.82 26.19 26.34 26.51 27.11 27.11 27.42 13 23.96 23.10 23.89 24.84 25.41 25.83 26.20 26.33 26.51 27.12 27.43 14 23.97 23.11 23.92 24.88 25.42 25.85 26.21 26.33 26.51 27.22 27.13 27.44 15 23.98 23.13 23.95 24.91 25.44 25.86 26.21 26.33 26.53 26.99 27.14 27.45 16 24.00 23.14 23.98 24.93 25.45 25.86 26.23 26.33 26.53 26.95 27.15 27.46 17 24.01 23.16 24.01 24.95 25.47 25.87 26.24 26.34 26.54 26.94 27.14 27.48 18 24.02 23.17 24.04 24.98 25.48 25.89 26.25 26.34 26.54 26.93 27.14 27.48 19 24.03 23.18 24.08 25.00 25.50 25.90 26.25 26.35 26.56 26.94 27.15 27.50 20 24.05 23.20 24.09 25.03 25.51 25.92 26.26 26.34 26.57 26.94 27.14 27.51 21 23.99 23.21 24.12 25.06 25.53 25.93 26.28 26.34 26.58 26.95 27.15 27.52 22 23.90 23.23 24.15 25.08 25.54 25.94 26.28 26.58 26.95 27.18 27.49 23 23.84 23.25 24.18 25.10 25.56 25.96 26.29 26.51 26.59 26.96 27.18 27.40 24 23.73 23.26 24.22 25.11 25.57 25.98 26.30 26.49 26.60 26.97 27.19 27.06 25 23.62 23.29 24.25 25.13 25.59 25.98 26.30 26.48 26.61 26.97 27.26 26.79 26 23.53 23.32 24.28 25.16 25.60 26.00 26.31 26.48 26.62 26.97 27.26 26.63 27 23.45 23.34 24.32 25.17 25.62 26.01 26.33 26.48 26.63 26.98 27.27 26.50 28 23.38 23.36 24.35 25.19 25.64 26.03 26.33 26.48 26.65 26.99 27.26 26.40 29 23.31 23.40 24.38 25.22 26.04 26.34 26.48 26.66 26.99 27.27 26.31 30 23.26 23.43 24.41 25.24 26.05 26.36 26.47 26.66 27.00 27.26 26.26 31 23.23 24.43 25.26 26.06 26.47 27.01 27.28 LOW 24.05 23.43 24.43 25.26 26.06 26.36 26.66 27.28 27.52 HIGH 23.23 23.07 23.45 24.45 25.65 26.07 26.46 27.02 26.26 21 1- 4c 23 us La La z.ixu- 25 W La o 27 Z 4 29 AMJ J A S 0 N D J FM AMJ J A S 1988 19 89 -376 GROUND-WATER LEVELS RIO SALINAS TO RIO JACAGUAS BASINS 180012066125500 Local number, HW-TW-11. LOCATION.--Lat 18:00'12", long 66'12'55'. Owner: U.S. Geological Survey, WRD. Name: HW-TW-11. AQUIFER.--Fractured, volcanic rock, water-table aquifer. WELL CHARACTERISTICS.--Drilled observation well, diameter 7 in (0.18 m), 0-94.9 ft (0-28.9 m), cased 4 in (0.10 m), 0-94 ft (0-28.6 m), screened 79-89 ft (24.1-27.1 m). Depth 94.9 ft (28.9 m). DATUM.--Elevation of land-surface datum is 240 ft (73.2 m) above mean sea level. Measuring point: Hole on side of casing, 3.04 ft (0.96 m) above land-surface datum. Prior October 13, 1988 top of shelter floor, 3.74 ft (1.14 m) above land-surface datum. REMARKS.--Recording observation well. Aquifer test performed on Dec. 9, 1988 and May 23, 1989. PERIOD OF RECORD.--April 14, 1988 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 57.00 ft (17.4 m) below land-surface datum, Apr. 14, 1988; lowest water level recorded, 72.04 ft (21.9 m) below land-surface datum, Sept. 24,25-26, 1989. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 63.67 64.55 65.03 65.67 66.51 67.24 68.05 68.87 70.45 71.08 71.53 2 63.73 64.58 65.06 65.68 66.55 67.26 68.06 68.91 70.46 71.10 71.55 3 63.78 64.60 65.07 65.71 66.57 67.29 68.09 68.94 70.47 71.13 71.57 4 63.81 64.61 65.09 65.73 66.60 67.32 68.12 68.96 70.48 71.15 71.59 5 63.85 64.62 65.12 65.75 66.62 67.35 68.14 68.99 70.50 71.16 71.62 b 63.89 64.64 65.14 65.78 66.65 67.37 68.17 69.03 70.52 71.20 71.63 7 63.94 64.65 65.16 65.80 66.67 67.39 68.20 69.04 70.56 71.23 71.65 8 63.96 64.67 65.18 65.83 66.69 67.42 68.22 69.07 70.57 71.25 71.68 9 63.99 64.68 68.39 65.85 66.73 67.44 68.25 69.11 70.58 71.29 71.71 10 64.02 64.69 65.36 65.88 66.76 67.46 68.29 69.14 70.60 71.30 71.73 11 64.05 64.70 65.27 65.91 66.78 67.48 68.31 69.15 70.66 71.33 71.76 12 64.09 64.71 65.25 65.95 66.80 67.51 68.34 69.17 70.09 70.74 71.35 71.77 13 64.14 64.72 65.27 65.98 66.83 67.55 68.37 69.19 70.09 70.75 71.38 71.78 14 64.15 64.74 65.29 66.01 66.86 67.57 68.40 69.22 70.09 70.76 71.39 71.82 15 64.17 64.76 65.31 66.04 66.87 67.61 68.43 69.28 70.09 70.79 71.43 71.85 16 64.20 64.78 65.34 66.07 66.91 67.63 68.46 69.32 70.10 70.79 11.44 71.86 17 64.23 64.80 65.35 66.09 66,94 67.66 68.49 69.36 70.10 70.79 71.43 71.89 18 64.25 64.82 65.37 66.10 66.97 67.68 68.50 69.41 70.12 70.81 71.48 71.89 19 64.28 64.83 65.40 66.13 67.00 67.71 68.52 69.44 70.13 70.93 71.48 71.95 20 64.30 64.85 65.41 66.16 67.03 67.75 68.54 69.48 70.15 70.93 71.49 71.96 21 64.34 64.86 65.44 66.19 67.05 67.77 68.57 69.52 70.17 70.94 71.51 71.99 22 64.36 64.88 65.46 66.22 67.07 67.80 68.60 69.59 70.19 70.97 71.52 72.01 23 64.41 64.89 65.48 66.25 67.09 67.82 68.63 70.23 70.97 71.53 72.03 24 64.42 64.90 65.51 66.27 67.12 67.86 68.66 70.25 70.99 71.53 72.03 25 64.43 64.92 65.53 66.30 67.14 67.87 68.69 70.28 70.96 71.49 72.04 26 64.45 64.95 65.55 66.34 67.17 67.90 68.72 70.31 70.97 71.50 72.03 27 64.47 64.97 65.58 66.36 67.20 67.93 68.75 70.34 70.98 71.51 72.01 28 64.49 64.98 65.59 66.39 67.22 67.95 68.78 70.37 70.99 71.51 72.00 29 64.50 65.00 65.62 66.42 --- 67.97 68.81 70.42 70.99 71.51 71.99 30 64.51 65.02 65.63 66.45 67.99 68.84 70.44 71.00 71.51 71.99 31 64.53 --- 65.65 66.47 68.01 --- --- 71.03 71.53 --- LOW 64.53 65.02 68.39 66.47 67.22 68.01 68.84 71.03 71.53 72.04 HIGH 63.67 64.55 65.03 65.67 66.51 67.24 68.05 70.45 71.08 71.53 56 1- 4 ww62 L., c) zat. 68 - (4 La I -J CE Z 4( J 74 AMJ J A S 0 N D J FA4 AMJJ AS 1988 1989 377 GROUND-WATER LEVELS RIO SALINAS TO RIO JACAGUAS BASINS 180012066125502 Local number, HW-TW-11C. LOCATION.--Lat 18°00'12", long 66'12 1 55k. Owner: U.S. Geological Survey, WRD. Name: HW-TW-11C. AQUIFER.--Fractured, volcanic rock, water-table aquifer. WELL CHARACTERISTICS.--Drilled observation well, diameter 6 in (0.15 m), 0-95.0 ft (0-29.0 m) diameter 2.9 in (0,07m), 95-200 ft (29.0-61.0 m ), cased 4 in (0.10 m), 0-95 ft (0-29.0 m), open hole 95-200 ft (29.0-61.0 m). Depth 200 ft (61.0 m). DATUM.--Elevation of land-surface datum is 240 ft (73.2 m) above mean sea level. Measuring point: Top of shelter floor, 3.56 ft (1.08 m) above land-surface datum. REMARKS.--Recording observation well. Automatic digital recorder installed on December 16, 1988. Pumping test on May 23-24, 1989. PERIOD OF RECORD.--December 1988 to September 30, 1989. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 63.51 ft (19.4 m) below land-surface datum, Dec. 15, 1988; lowest water level recorded, 70.12 ft (21.4 m) below land-surface datum, Sept. 24, 1989. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 63.89 64.66 65.32 66.16 67.11 68.56 69.19 69.67 2 63.91 64.72 6534 66.21 67.15 68.58 69.21 69.66 3 63.93 64.73 65.38 66.26 67.19 68.60 69.23 69.65 4 63.97 64.76 65.42 66.29 67.25 68.62 69.25 69.64 5 63.98 64.80 65.44 66.32 67.27 68.64 69.28 69.64 6 64.01 64.83 65.47 66.32 67.27 68.66 69.30 69.68 7 64.04 64.85 65.53 66.34 67.27 68.68 69.32 69.68 8 64.05 64.85 65.57 66.35 67.26 68.69 69.34 69.70 9 64.08 64.86 65.60 66.36 67.27 68.71 69.36 69.73 10 64.11 64.86 65.61 66.39 67.27 68.73 69.38 69.77 11 64.13 64.87 65.62 66.40 67.30 68.75 69.41 69.82 12 64.16 64.88 65.64 66.44 67.33 68.18 68.77 69.43 69.89 13 64.16 64.93 65.68 66.50 67.38 68.20 68.79 69.45 69.93 14 64.18 64.96 65.70 66.56 67.41 68.22 68.81 69.47 69.96 15 64.21 64.97 65.71 66.55 67.46 68.24 68.83 69.45 69.98 16 63.57 64.24 64.99 65.72 66.59 67.50 68.26 68.85 69.46 69.99 17 63.59 64.27 65.01 65.72 66.63 67.62 68.28 68.87 69.48 69.98 18 63.62 64.27 65.05 65.73 66.67 68.30 68.89 69.49 69.94 19 63.65 64.30 65.10 65.75 66.71 68.32 68.91 69.50 70.00 20 63.68 64.33 65.13 65.76 66.77 68.34 68.93 69.52 70.02 21 63.71 64.37 65.15 65,78 66.81 68.36 68.95 69.53 70.06 22 63.72 64.40 65.18 65.84 66.82 68.38 68.97 69.54 70.07 23 63.73 64.42 65.20 65.86 66.83 68.40 68.99 69.56 70.09 24 63.75 64.43 65.21 65.93 66.85 68.42 69.01 69.57 70.12 25 63.76 64.44 65.21 65.96 66.88 68.44 69.03 69.62 70.11 26 63.78 64.46 65.23 65.97 66.90 68.46 69.06 69.63 70.09 27 63.81 64.48 65.26 66.00 66.93 68.48 69.08 69.64 70.06 28 63.82 64.52 65.30 66.03 66.97 68.50 69.10 69.66 70.0 29 63.84 64.55 --- 66.06 67.01 68.52 69.13 69.66 70.04 30 63.85 64.58 66.08 67.07 68.54 69.15 69.66 70.03 31 63.87 64.61 66.12 --- --- 69.17 69.66 --- LOW 64.61 65.30 66.12 67,07 69.17 69.66 70.12 HIGH 63.89 64.66 65.32 66.16 68,56 69.19 69.64 0 -J 62 W 1- < 65 la. 14 0 z .ct L&I > (1) 68 w -J 0 Z 1- -I 4c 71 3: DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1988 1989 378 GROUND-WATER LEVELS RIO SALINAS TO RIO JACAGUAS BASINS 175957066123400 Local number, HW-TW-13. LOCATION.--Lat 17°59'57", long 66°12'34". Owner: U.S. Geological Survey, WRD. Name: HW-TW-13. AQUIFER.--Fractured, volcanic rock, water-table aquifer. WELL CHARACTERISTICS.--Drilled observation well, diameter 7 in (0.18 m), 0-69 ft (0-21.0 m), cased 4 in (0.10 m), 0-69 ft-(8-21.0 m), screened 4.0-69 ft (1.22-21.0 m). Depth 69 ft (21.0 m). DATUM.--Elevation of land-surface datum is 203 ft (61.9 m) above mean sea level. Measuring point: Hole on side of casing, 2.33 ft (0.71 m) above land-surface datum. Prior October 14, 1988, top of shelter floor, 3.47 ft (1.06 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--April 14, 1988 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 44.44 ft (13.5 m) below land-surface datum, Sept. 24-25, 1989; lowest water level recorded, 46.95 ft (14.3 m) below land-surface datum, June 8, 1988. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 46.50 46.21 45.83 45.17 44.78 44.87 45.35 45.37 45.42 45.36 45.52 45.51 2 46.51 46.21 45.84 45.15 44.79 44.92 45.40 45.36 45.45 45.37 45.47 45.53 3 46.53 46.20 45.84 45.12 44.82 44.96 45.42 45.38 45.44 45.37 45.43 45.54 4 46.40 46.19 45.83 45.12 44.85 44.93 45.44 45.39 45.46 45.39 45.39 45.54 5 46.35 46.17 45.83 45.15 44.82 44.86 45.46 45.38 45.47 45.42 45.37 45.54 6 46.31 46.13 45.83 45.12 44.79 44.79 45.46 45.37 45.49 45.44 45.36 45.55 7 46.31 46.12 45.84 45.09 44.77 44,76 45.22 45.38 45.50 45.47 45.36 45.56 8 46.31 46.03 45.84 45.04 44.77 44.74 45.29 45.39 45.50 45.48 45.35 45.57 9 46.34 45.97 45.84 45.01 44.78 44.73 45.35 45.40 45.50 45.47 45.33 45.59 10 46.36 45.95 45.84 45.00 44.77 44.72 45.37 45.39 45.52 45.46 45.31 45.60 11 46.37 45.95 45.85 44.99 44.77 44.72 45.38 45.38 45.51 45.47 45.29 45.61 12 46.38 45.94 45.86 44.97 44.75 44.73 45.39 45.37 45.49 45.53 45.28 45.60 13 46.38 45.90 45.90 44.97 44.75 44.73 45.39 45.37 45.48 45.54 45.25 45.58 14 46.37 45.88 45.93 44,97 44.75 44.74 45.40 45.39 45.48 45.54 45.28 45.58 15 46.37 45.86 45.96 44.95 44.74 44.74 45.41 45.42 45.48 45.55 45.17 45.58 16 46.40 45.82 45.96 44.94 44.74 44.76 45.41 45.43 45.44 45.56 45.18 45.58 17 46.40 45.80 45.85 44.89 44.74 44.78 45.41 45.45 45.42 45.56 45.23 45.58 18 46.38 45.79 45.81 44.88 44.76 44.79 45.41 45.44 45.43 45.56 45.26 45.58 19 46.37 45.80 45.77 44.88 44.75 44.83 45.33 45.42 45.41 45.57 45.28 45.56 20 46.35 45.77 45.69 44.87 44.74 44.86 45.24 45.40 45.38 45.58 45.29 45.54 21 46.32 45.78 45.62 44.86 44.74 44.88 45.19 45.42 45,35 45.59 45.31 45.38 22 46.15 45.77 45.57 44.87 44.74 44.90 45.17 45.43 45.33 45.60 45.34 45.37 23 46.10 45.78 45.50 44.86 44.76 44.93 45.15 45.43 45.30 45.61 45.36 45.38 24 46.03 45.77 45.46 44.85 44.79 44.98 45.15 45.41 45.28 45.63 45.38 44.47 25 45.85 45.77 45.45 44.86 44.81 45.04 45.31 45.41 45.28 45.62 45.41 44.46 26 45.87 45.78 45.42 44.86 44.82 45.08 45.34 45.40 45.29 45.59 45.44 44.47 27 45.98 45.78 45.36 44.87 44.82 45.12 45.33 45.38 45.29 45.56 45.46 44.47 28 46.13 45.79 45.35 44.85 44.85 45.15 45.32 45.37 45.30 45.54 45.47 44.49 29 46.16 45.80 45.30 44.82 45.18 45.34 45.41 45.33 45.54 45.48 44.49 30 46.19 45.81 45.23 44.82 45.22 45.36 45.42 45.35 45.57 45.49 44.48 31 46.19 45.19 44.80 45.27 45.42 45.57 45.50 LOW 46.53 46.21 45.96 45.17 44.85 45.27 45.46 45.45 45.52 45.63 45.52 45.61 HIGH 45.85 45.77 45.19 44.80 44.74 44.72 45.15 45.36 45.28 45.36 45.17 44.46 WTR YR 1989 MEAN 45.41 LOW 46.53 HIGH 44.46 44 9 Leda 1_4= wiz ZsC ta- 46 tal > (1) 41 -J crz W-1 48 AMJJ A S 0 N D J FM AMJJ AS 1988 1989 379 GROUND-WATER LEVELS RIO SALINAS TO RIO JACAGUAS BASINS 175946066102000 Local number, HW-TW-14. LOCATION.--Lat 17°59'46", long 66'10'20". Owner: U.S. Geological Survey, WRD. Name: HW-TW-14. AQUIFER.--Fractured, volcanic rock, water-table aquifer. WELL CHARACTERISTICS.--Drilled observation well, diameter 7 in (0.18 m), 0-79 ft (0-24.4 m), cased 4 in (0.10 m), 0-79 ft (0-24.1 m), screened 71-78 ft (21.6-23.8 m). Depth 79 ft (24.1 m). DATUM.--Elevation of land-surface datum is 205 ft (62.5 m) above mean sea level. Measuring point: Hole on side of casing, 3.02 ft (0.92 m) above land-surface datum. Prior October 7, 1988, top of shelter floor, 3.67 ft (1.12 m) above land-surface datum. REMARKS.--Recording Observation well. Well dry at 74.44 ft (22.69 m). PERIOD OF RECORD.--December 1987 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 41.1 ft (12.5 m) below land-surface datum, Dec. 17, 1987; lowest water level recorded, 74.45 ft (22.7 m) below land-surface datum, Aug. 16, 1989. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 INSTANTANEOUS OBSERVATIONS Water Water Water Date level Date level Date level Oct. 7 60.99 Dec. 8 60.50 Feb. 9 65.20 Nov. 4 59.70 Jan. 13 62.64 WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 69.14 72.12 73.28 74.36 74.44 74.45 2 69.22 72.13 73.32 74.37 74.44 74.45 3 69.28 72.14 73.41 74.38 74.44 74.45 4 69.37 72.15 73.47 74.39 74.44 74.45 5 69.46 72.17 73.54 74.40 74.44 74.45 6 69.55 72.19 73.63 74.40 74.44 74.45 7 --- 69.65 72.20 73.70 74.41 74.44 74.45 8 68.04 69.73 72.21 73.77 74.41 74.44 74.45 9 68.11 69.84 72.22 73.83 74.42 74.44 74.45 10 68.20 69.95 72.23 73.89 74.42 74.44 74.45 11 68.26 70.05 72.26 73.95 74.42 74.44 74.45 12 68.36 70.18 72.30 74.01 74.43 74.44 74.45 13 68.40 70.30 72.34 74.02 74.43 74.44 74.45 14 68.47 70.43 72.38 74.05 74.43 74.44 74.45 15 68.52 70.56 72.42 74.08 74.43 74.44 74.45 16 68.56 70.70 72.46 74.11 74.43 74.45 74.45 17 68.57 70.84 72.51 74.14 74.43 74.45 74.45 18 68.59 70.97 72.55 74.17 74.43 74.45 74.45 19 68.59 71.09 72.59 74.20 74.43 74.45 74.45 20 68.62 71.23 72.64 74.23 74.43 74.45 74.45 21 68.65 71.35 72.69 74.25 74.43 74.45 74.45 22 68.69 71.49 72.75 74.26 74.43 74.45 74.45 23 68.73 71.63 72.81 74.28 74.43 74.45 74.45 24 68.77 71.76 72.85 74.29 74.43 74.45 74.45 25 68.80 71.88 72.91 74.30 74.43 74.45 74.45 26 68.84 72.00 72.95 74.31 74.44 74.45 74.45 27 68.89 72.06 73.00 74.32 74.44 74.45 74.45 28 68.92 72.10 73.06 74.33 74.44 74.45 74.45 29 68.98 72.11 73.11 74.33 74.44 74.45 74.45 30 69.02 72.12 73.17 74.35 74.44 74.45 74.45 31 69.08 --- 73.22 --- 74.44 74.45 --- LOW 72.12 73.22 74.35 74.44 74.45 74.45 HIGH 69.14 72.12 73.28 74.36 74.44 74.45 3 65 01 wo 70 Z >v,) 80 FEB MAR APR MAY JUN JUL AUG SEP 1989 75 380 GROUND-WATER LEVELS RIO SALINAS TO RIO JACAGUAS BASINS 175955066103000 Local number, HW-TW-15. LOCATION.--Lat 17°59'55", long 66'10'30". Owner: U.S. Geological Survey, WRD. Name: HW-TW-15. AQUIFER.--Fractured, volcanic rock, water-table aquifer. WELL CHARACTERISTICS.--Drilled observation well, diameter 7 i4 (0.18 m), 0-85 ft (0-25.9 m), cased 4 in (0.10 m), 0-85 ft (0-25.9 m), screened 70-80 ft (21.3-24.4 m). Depth 85 ft (25.9 m). DATUM.--Elevation of land-surface datum is 269 ft (82.0 m) above mean sea level. Measuring point: Hole on side of casing, 3.12 ft (0.95 m) above land-surface datum, Prior October 7, 1988, top of shelter floor, 3.60 ft (1.10 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--March 30, 1988 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 36.20 ft (11.0 m) below land-surface datum, Mar. 30, 1988; lowest water level recorded, 60.23 ft (18.4 m) below land-surface datum, Sept. 23-24, 1989. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 53.69 54.87 56.07 57.04 57.89 58.65 59.26 59.88 2 53.73 54.92 56.09 57.06 57.92 58.67 59.28 59.90 3 53.78 54.96 56.12 57.08 57.95 58.68 59.30 59.92 4 53.81 55.00 56.15 57.10 57.97 58.70 59.33 59.93 5 53.85 55.05 56.18 57.13 58.00 58.73 59.35 59.94 6 53.90 55.09 56.23 57.16 58.03 58.74 59.38 59.95 7 53.93 55.13 56.30 57.18 58.05 58.76 59.39 59.96 8 53.97 55.16 56.33 57.22 58.07 58.79 59.41 59.97 9 54.01 55.19 56.36 57.25 58.09 58.82 59.43 59.99 10 54.05 55.24 56.39 57.28 58.12 58.85 59.44 60.00 11 54.09 55.28 56.42 57.30 58.15 58.89 59.48 60.02 12 54.14 55.31 56.45 57.33 58.17 58.91 59.50 60.03 13 53.03 54.18 55.35 56.48 57.36 58.19 58.94 59.52 60.06 14 53.05 54.22 55.38 56.51 57.39 58.22 58.96 59.54 60.08 15 53.07 54.27 55.40 56.55 57.42 58.25 58.97 59.57 60.10 16 53.09 54.31 55.45 56.59 57.45 58.27 58.98 59.59 60.11 17 53.11 54.35 55.48 56.63 57.48 58.29 58.99 59.62 60.13 18 53.13 54.40 55.51 56.66 57.50 58.32 59.00 59.63 60.15 19 53.17 54.44 55.55 56.70 57.54 58.34 59.02 59.65 60.16 20 53.24 54.48 55.60 56.72 57.57 58.36 59.04 59.66 60.17 21 53.27 54.53 55.64 56.74 57.60 58.40 59.06 59.67 60.18 22 53.31 54.57 55.67 56.77 57.63 58.42 59.08 59.69 60.19 23 53.35 54.61 55.71 56.80 57.66 58.43 59.11 59.71 60.21 24 53.40 54.66 55.75 56.83 57.68 58.46 59.14 59.72 60.21 25 53.44 54.70 55.80 56.86 57.71 58.49 59.16 59.73 60.16 26 53.47 54.74 55.83 56.89 57.74 58.51 59.16 59.75 60.15 27 53.51 54.79 55.87 56.92 57.76 58.54 59.18 59.77 60.14 28 53.55 54.83 55.90 56.95 57.78 58,56 59.20 59.83 60.15 29 53.58 55,96 56.98 57.82 58.59 59.21 59.85 60.15 30 53.62 56.01 57.02 57.85 58.62 59.23 59.86 60.15 31 53.66 56.04 57.87 59.25 59.88 LOW 54.83 56.04 57.02 57.87 58.62 59,25 59.88 60.21 HIGH 53.69 54.87 56.07 57.04 57.89 58.65 59.26 59.88 0 32 aO1 < W W 42 LaJ 52 > Z H -I 62 M AMJJ A S ONDJ FM A M J J AS 1988 1989 381 GROUND-WATER LEVELS RIO SALINAS TO RIO JACAGUAS BASINS 180153066302800. Local number, JAC-1. LOCATION.--Lat 18'01'53", long 66°02'28". Owner: U.S. Geological Survey, WRD. Name: JAC-TW1 AQUIFER,--Alluvium. WELL CHARACTERISTICS.--Drilled observation water-table well, diameter 7 in (0.18 m), 0-69 ft (0=0.21.0 m), cased 4.0 in (0.10 m), 0-69 ft (0-21.0 m), screened 64-69 ft (19.5-21 m), concrete sealed 0-15 ft (0-4.57 m). Depth 69 ft (21.0 m). DATUM.--Elevation of land-surface datum is about 78.7 ft (24.0 m) above mean sea level, from topographic map. Measuring point: Hole on side of casing, 3.75 ft (1.14 m) above land-surface datum. REMARKS.--Observation well. Automatic digital recorder installed on September 1988. PERIOD OF RECORD.--October 1988 to September 1989. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 17.48 ft (5.33 m) below land-surface datum, Oct. 29, 1988; lowest water level recorded, 26.34 -ft (8.03 m) below land-surface datum, Aug. 5, 1989. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FE8 MAR APR MAY JUN JUL AUG SEP 1 18.44 18.40 19.72 19.29 19.68 20.38 19.80 20.98 22.78 24.13 25.88 19.96 2 18.76 18.68 19.75 19.35 19.39 20.41 19.96 21.00 22.62 24.20 26.02 20.05 3 18.91 18.91 19.75 19.40 19.62 20.47 20.02 21.01 22.47 24.29 26.12 19.72 4 18.95 19.13 19.72 19.44 19.63 20.55 20.13 21.05 22.27 24.34 26.24 19.72 5 18.82 19.31 19.70 19.47 19.63 20.66 20.23 21.05 22.37 24.45 26.33 19.73 6 18.93 19.47 19.41 19.49 19.64 20.76 20.15 21.03 22.60 24.57 26.25 19.64 7 18.98 19.58 19.65 19.48 19.67 20.86 20.33 21.02 22.82 24.64 26.05 19.68 8 19.02 19.68 19.68 19.58 19.76 20.92 20.25 20.98 22.98 24.71 25.50 19.72 9 19.05 19.75 19.69 19.59 19.84 21.01 20.44 20.96 23.08 24.72 25.00 19.60 10 19.08 19.85 19.65 19.61 19.80 21.06 20.56 20.94 23.20 24.84 25.47 19.56 11 18.21 19.84 19.61 19.64 19.61 21.12 20.50 20.97 23.31 24.99 25.64 19.35 12 18.08 19.91 19.55 19.67 19.46 21.24 20.73 21.03 22.98 25.02 24.70 19.28 13 18.39 19.55 19.51 19.68 19.37 20.30 20.78 21.05 23.04 24.11 23.16 19.28 14 18.66 19.71 19.45 19.71 19.34 20.27 20.79 21.03 23.45 24.31 22.67 19.29 15 18.81 19.82 19.38 19.73 19.49 20.15 20.79 21.07 23.60 24.18 22.16 19.30 16 19.02 19.91 19.37 19.72 19.68 20.22 20.79 21.19 23.67 24.55 21.86 19.20 17 19.16 19.88 19.28 19.70 19.60 20.28 20.77 21.33 23.77 24.71 22.19 19.21 18 19.19 19.31 19.21 19.67 19.76 20.35 20.75 21.44 23.32 24.77 22.76 19.04 19 19.28 19.25 19.25 19.64 19.80 20.45 20.79 21.34 22.95 24.85 22.58 18.94 20 19.47 19.40 19.25 19.62 19.87 20.53 20.29 21.53 22.98 24.97 22.36 18.85 21 19.55 19.49 19.31 19.60 19.93 20.20 20.71 21.70 23.17 25.07 21.48 18.85 22 19.53 19.46 19.36 19.64 19.96 20.47 20.75 21.86 23.31 25.16 20.60 18.84 23 19.49 19.12 19.33 19.61 19.97 20.37 20.65 22.00 23.46 25.23 20.52 18.80 24 19.08 19.28 19.35 19.61 20.01 20.37 20.75 22.14 23.58 25.24 20.33 18.75 25 18.84 19.39 19.23 19.61 20.06 20.40 20.79 22.33 23.60 25.24 20.27 18.71 26 18.83 19.42 19.09 19.61 20.12 20.47 20.84 22.46 23.71 25.27 20.23 18.67 27 18.37 19.52 19.05 19.64 20.20 20.56 20.93 22.57 23.81 25.31 20.19 18.63 28 17.95 19.32 19.05 19.67 20.29 20.58 21.05 22.62 23.85 25.40 20.17 18.58 29 17.61 19.48 19.11 19.67 --- 20.48 21.13 22.65 23.93 25.55 19.99 18.54 30 17.85 19.66 19.15 19.65 19.79 21.04 22.75 24.03 25.67 20.02 18.50 31 18.15 --- 19.22 19.60 19.78 --- 22.68 --- 25.80 20.06 --- LOW 19.55 19.91 19.75 19.73 20.29 21.24 21.13 22.75 24.03 25.80 26.33 20.05 HIGH 17.61 18.40 19.05 19.29 19.34 19.78 19.80 20.94 22.27 24.11 19.99 18.50 WTR YR 1989 MEAN 20.84 LOW 26.33 HIGH 17.61 92 16 LcOj < 14.1 w w 20 z -Lt 24 L8T W.J 28 OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1988 1989 382 GROUND-WATER LEVELS RIO SALINAS TO RIO JACAGUAS BASINS 180153066302801. Local number, JAC-2. LOCATION.--Lat 18°01'53", long 66- 30'28". Owner: U.S. Geological Survey, WRD. Name: JAC-TW2 AQUIFER.--Alluvium. WELL CHARACTERISTICS.--Drilled observation water-table well, diameter 7 in (0.18 m) cased 4.0 in (0.10 m), 0-49 ft (0-14.9 m), screened 44-49 ft (13.4-14.9 m), concrete sealed 0-40 ft (0-12.2 m). Depth 49 ft (14.9 m). DATUM.--Elevation of land-surface datum is about 78.7 ft (24.0 m) above mean sea level, from topographic map. Measuring point: Hole- on side of casing, 3.35 ft (1.02 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--March 1989 to September 1989. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 18.97 ft (5.77 m) below land-surface datum, July 26, 1989; lowest water level measured, 26.17 ft (7.98 m) below land-surface datum, Sept. 21, 1989. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 INSTANTANEOUS OBSERVATION Water Water Water Water Date level Date level Date level Date level Mar. 28 21.32 May 30 23.05 July 26 26.17 Sept. 21 18.97 Apr. 24 21.54 180124066310200. Local number, JAC-3. LOCATION.--Lat 18'01'24", long 66 31'02". Owner: U.S. Geological Survey, wRO. Name: JAC-TW5 AQUIFER.--Alluvium. WELL CHARACTERISTICS.--Drilled observation water-table well, diameter 7 in (0.18 m) cased 4.0 in (0.10 m), 0-50 ft (0-15.2 m), screened 45-50 ft (13.7-15.2 m), concrete sealed 0-10 ft (0-3.05 m). Depth 50 ft (15.2 m). DATUM.--Elevation of land-surface datum is about 63 ft (19.2 m) above mean sea level, from topographic map. Measuring point: Hole on side of casing , 2.98 ft (0.91 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--March 1989 to September 1989. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 21.15 ft (8.28 m) below land-surface datum, Sept. 21, 1989; lowest water level measured, 28.54 ft (8.70 m) below land-surface datum, Apr. 24, 1989. WATER LEVEL, IN hal BELOW LAND-SURFACE DATUM. WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 INSTANTANEOUS OBSERVATION Water Water Water Date level Date level Date level Mar. 28 28.36 Apr. 24 28.54 Sept. 21 27.15 GROUND-WATER LEVELS 383 RIO SALINAS TO RIO JACAGUAS BASINS 180057066311300. Local number, JAC-4. LOCATION.--Lat 18°00'57", long 66°31'13". Owner: U.S. Geological Survey, WRO. Name: JAC-TW6 AQUIFER.--Alluvium. WELL CHARACTERISTICS.--Drilled observation water-table well, diameter 7 in (0.18 m), cased 4.0 in (0.10 m), 0-49 ft (0-14.9 m), screened 44-49 ft (13.4-14.9 m). Depth 49 ft (14.9 m). DATUM.--Elevation of land-surface datum is about 47.6 ft (14.5 m) above mean sea level, from topographic map. Measuring point: Hole on side of casing, 3.90 ft (1.19 m) above land-surface datum. REMARKS.--Observation well. Automatic digital recorder installed on September 1988. PERIOD OF RECORD.--October 1988 to September 1989. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 18.61 ft (5.67 m) below land-surface datum, Oct. 2-3, 1988; lowest water level recorded, 23.0 ft (7.01 m) below land-surface datum, Aug. 10, 11-12, 1989. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 INSTANIANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 18.os 18.62 19.55 20.01 20.41 20.53 20.23 20.69 21.59 22.20 22.71 2 18.01 L8.70 19.59 20.01 20.40 20.54 20.20 20.70 21.59 22.22 22.71 18.01 18.76 19.61 20.01 20.38 20.58 20.20 20.10 21.59 22.22 22.71 4 18.6s 18.91 19.60 20.01 20.37 20.19 20.72 21.59 22.23 22.71 18.72 19.00 19.60 20.03 20.38 20.19 20.14 21.59 22.26 22.71 o 18./9 19.10 19.64 20.02 20.38 20.19 20.82 21.59 22.28 22.75 18.94 19.11 19.74 20.02 20.37 20.19 20.82 21.60 22.28 22.85 18.95 19.14 19.81 20.02 20.38 20.20 20.82 21.61 22.38 22.91 18.94 19.19 19.83 20.02 20.39 20.20 20.84 21.61 22.41 22.95 10 18.94 19.30 19.84 20.01 20.38 20.21 20.85 21.63 22.42 22.98 11 18.93 19.33 19.84 20.12 20.38 20.21 20.85 21.66 22.45 23.00 12 18.86 19.47 19.84 20.17 20.38 20.22 21.11 21.66 22.49 23.00 13 18.74 19.51 19.84 20.18 20.38 20.22 21.12 21.68 22.51 22.99 14 18.73 19.56 19.84 20.20 20.41 20.23 21.14 21.68 22.54 22.97 15 18.72 19.61 19.83 20.22 20.41 20.24 21.15 21.68 22.55 22.97 lb 18.74 19.61 19.83 20.28 20.35 20.28 21.15 21.70 22.54 22.97 1/ 18.80 19.60 19.86 20.29 20.34 20.36 21.16 21.71 22.53 22.97 18 18.94 19.60 19.95 20.30 20.3s 20.39 21.17 21.75 22.58 22.97 19 18.98 19.57 20.00 --- 20 32 20.45 21.17 21.79 22.59 22.97 20 19.15 19.57 20.00 20.32 eu 31 20.46 21.17 21.79 22.61 22.97 21 19.20 19.57 20.01 20.30 20.32 20.48 21.19 21.79 22.61 22.96 2,' 19.32 19.57 20.01 20.31 20.48 20.52 21.21 21.79 22.62 22.96 23 19.33 19.56 20.01 20.35 20.53 20.54 21.22 21.80 22.62 22.96 24 19.34 19.56 20.01 20.34 211.53 20.54 21.22 21.80 22.61 --- 25 19.32 19.56 20.01 --- 20.53 20.54 21.40 21.80 22.61 2b 19.18 19.56 20.00 20.32 20.52 20.56 21.42 21.80 22.64 21 19.11 19.56 20.00 20.34 20.51 --- 20.58 21.43 21.81 22.67 28 18.95 19.55 20.00 20.34 20.52 20.40 20.60 21.43 21.82 22.68 29 18.84 19.55 20.01 20.34 --- 20.40 20.62 21.44 21.84 22.71 3U 18.66 19.55 20.02 20.40 20.39 20.68 21.45 22.18 22.71 31 18.62 --- 20.01 20.42 20.35 --- 21.52 --- 22.71 LUW 19.34 19.61 20.02 20.53 20.68 21.52 22.18 22.71 HIGH 18.61 18.62 19.55 20.31 20.19 20.69 21.59 22.20 16 9 Claj 1_< La La L.. z 20 ..S4A Lai to Cil Z 24 OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1988 1989 384 GROUND-WATER LEVELS RIO INABON TO RIO LOCO BASINS 180133066503300. Local number, 132. LOCATION.--Lat 18°01'33", long 66°50'33". Owner: Pittsburg Plate Glass 4. Name: Yauco 2. AQUIFER.--Limestone of Tertiary Age. WELL CHARACTERISTICS.--Drilled observation well, cased 20 in (0.51 m) 0-20 ft (0-6.1 m), 12 in (0.30 m) perforated pipe 20-84 ft (6.1-25.61 m), 10 in (0.25 m) perforated pipe 84-190 ft (25.61-57.93 m). Depth 190 ft (57.93 m). DATUM.--Elevation of land-surface datum is about 75 ft (22.87 m) above mean sea level, from topographic map. Measuring point: Top of shelter floor, 2.35 ft (0.72 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--July 1972 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, *0.12 ft (0.04 m) below land-surface datum, July 19, 1979; lowest water level recorded, 36.91 ft (11.25 m) below land-surface datum, June 27, 1974. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 6.00 5.68 6.48 7.33 8.63 10.19 7.96 7.99 9.96 9,78 10.92 9.61 2 6.06 5.74 6.49 7,39 8.68 10.23 7.90 8.07 9.56 9.87 11.02 9.59 3 6.12 5.80 6.50 7.42 8.74 10.32 7,52 8.13 9.11 9.97 11.12 9.25 4 6.14 5.85 6.53 7.46 8.74 10.33 7.58 8.21 9.02 10.08 11,21 9.19 5 6.18 5.90 6.58 7.55 8.74 10.36 7.21 8.30 9.00 10.18 11.31 9.13 6 6.21 5.81 6.60 7.58 8.85 10.46 7.39 8.30 8.98 10.28 11.40 9.10 7 6.25 5.90 6.58 7.62 8.91 10.54 7.41 8,22 8.92 9.89 11.48 9.03 8 6.27 5.94 6.62 7.68 9.00 10.61 7.44 8.25 8.89 9.91 11.40 9.01 9 6.32 5.98 6.66 7.51 9.08 10.67 7,45 8.31 8.92 10.02 11.41 8.93 10 6.35 6.01 6.69 7.48 9.13 10.76 7.51 8.35 8.93 10.14 11.53 8.75 11 6.43 6,03 6.72 7.55 9.12 10.80 7,54 8.40 8,98 9,81 11.32 8.36 12 6,41 6.05 6.73 7,62 9.14 10.87 7.56 8.40 9.05 9.70 11.21 8.33 13 6.30 5.97 6.78 7.68 9.27 10.38 7.59 8.41 9.13 9.69 11.19 8.25 14 6.36 6.05 6.80 7.73 9.35 10.39 7.61 8.44 9.22 9.76 11.30 8.25 15 6.30 6.06 6.84 7.77 9.41 10.05 7.57 8.54 9,28 9.87 11.40 8.22 16 6.31 6.10 6.88 7.77 9.47 9.97 7.62 8.59 9,37 9.97 11,49 8.21 17 6.39 6.13 6.92 7.85 9.54 9.83 7.74 8.68 9.09 10.07 11,54 8,19 18 6.41 6.14 6.95 7.85 9.51 9.75 7,75 8.75 8.87 10,18 11.50 8.08 19 6.37 6.18 7.00 7.89 9.55 9.77 7.81 8.84 8.79 10.26 11.22 7.87 20 6.42 6.21 7,04 7.94 9.67 9.87 7.87 8.88 8.89 10.35 11.16 7.59 21 6.44 6.26 7.09 7.99 9.75 9.43 7.94 8.94 8.99 10.46 11.09 7.65 22 6.47 6.30 7.12 8.05 9.83 9.33 7.94 9.09 9.05 10.54 10.95 7.65 23 6.49 6.20 7.06 8.10 9.90 9.14 8.00 9.21 9.13 10.67 10.90 7.41 24 4.53 6.25 7.09 8.15 9.94 9.03 8.11 9.29 9.21 10.75 10.79 7.11 25 5.07 6.28 7.13 8.24 9.91 8.93 8.17 9.40 9.29 10.86 10.56 7.11 26 5.31 6.31 7.09 8.33 9.94 8.91 8.20 9.47 9.36 10.96 10.31 7.16 27 5.36 6.32 7.11 8.38 10.10 8.96 8.24 9.54 9.44 11.05 10.26 6,85 28 5.40 6.37 7.14 8.36 10.17 8.29 8.11 9.60 9.52 11.13 10.20 6.96 29 5.42 6.41 7.20 8.41 --- 8.24 8.01 9.69 9.60 11.20 9.94 7.03 30 5.46 6.44 7.23 8.50 8.15 7.96 9.79 9.72 11.27 9.86 7.10 31 5.57 --- 7.29 8.55 8.07 --- 9.87 --- 10.95 9.80 --- LOW 6.49 6.44 7.29 8.55 10.17 10.87 8.24 9.87 9.96 11.27 11.54 9.61 HIGH 4.53 5.68 6.48 7.33 8.63 8.07 7.21 7.99 8.79 9.69 9.80 6.85 WTR YR 1989 MEAN 8.43 LOW 11.54 HIGH 4.53 9i 2 cO' Wo 6 L L102 Z.ix". 10 > 4.1 I 14 -J • 18 ONDJFMAPAJJASONDJFMAMJJASONDJFMAMJJAS 1986 1987 1988 1989 * Above land-surface datum. 385 GROUND-WATER LEVELS RIO GUANAJIBO BASIN 180132067033800. Local number, 143. LOCATION.--Lat 18°01'32", long 67°03'38". Owner: Pedro P. Vivoni. Name: Vivoni, Hacienda Amistad. AQUIFER.--Limestone of unknown age. WELL CHARACTERISTICS.--Drilled unused irrigation well, diameter 12 in (0.30 m). Depth 200 ft (60.98 m). DATUM.--Elevation of land-surface datum is about 52.5 ft (16.0 m) above mean sea level, from topographic map. Measuring point: Hole side of casing, 0.80 ft (0.24 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--December 1981 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 37.36 ft (11.39 m) below land-surface datum, Nov. 20, 1985; lowest water level recoraed, 39.96 ft (12.2 m) below land-surface datum, Aug. 14, 15, 16-17, 1989. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 38.86 39.00 39.25 39.54 39.73 39.54 39.47 39.63 39.77 39.86 39.88 2 38.85 38.85 38.98 39.25 39.55 39.68 39.54 39.49 39.63 39.77 39.87 39.86 3 38.87 38.89 38.99 39.26 39.56 39.71 39.48 39.49 39.63 39.78 39.83 39.85 4 38.85 38.86 39.02 39.26 39.58 39.75 39.48 39.47 39.62 39.77 39.84 39.85 5 38.85 38.86 39.04 39.31 39.61 39.75 39.44 39.47 39.65 39.81 39.86 39.83 6 38.87 38.88 39.07 39.35 39.61 39.74 39.44 39.49 39.67 39.81 39.86 39.81 7 38.89 38.88 39.04 39.36 39.61 39.75 39.43 39.48 39.66 39.78 39.88 39.85 8 38.88 38.89 39.06 39.34 39.63 39.78 39.41 39.46 39.66 39.77 39.87 39.88 9 38.89 38.87 39.07 39.35 39.61 39.78 39.43 39.47 39.67 39.77 39.89 39.89 10 38.90 38.88 39.07 39.37 39.61 39.75 39.42 39.46 39.67 39.79 39.90 39.90 11 38.90 38.88 39.08 39.37 39.61 39.73 39.41 39.48 39.69 39.77 39.89 39.89 12 38.91 38.87 39.08 39.36 39.60 39.70 39.39 39.47 39.69 39.77 39.90 39.91 13 38.88 38.85 39.07 39.37 39.61 39.72 39.39 39.50 39.71 39.77 39.94 39.90 14 38.85 38.87 39.11 39.38 39.63 39.73 39.38 39.52 39.72 39.79 39.95 39.92 15 38.81 38.87 39.13 39.39 39.54 39.74 39.39 39.56 39.72 39.83 39.95 39.92 16 38.83 38.86 39.13 39.39 39.56 39.72 39.42 39.57 39.72 39.81 39.95 39.91 17 38.85 38.88 39.12 39.40 39.60 39.72 39.44 39.58 39.74 39.80 39.95 39.85 18 38.85 38.89 39.14 39.41 39.59 39.70 39.41 39.58 39.72 39.83 39.92 39.70 19 38.82 38.90 39.17 39.40 39.62 39.69 39.39 39.58 39.72 39.83 39.91 39.82 20 38.84 38.92 39.16 39.39 39.66 39.71 39.39 39.58 39.73 39.81 39.91 39.79 21 38.88 38.90 39.17 39.40 39.68 39.66 39.39 39.59 39.13 39.84 39.87 39.80 22 38.86 38.93 39.17 39.44 39.67 39.67 39.40 39.61 39.71 39.84 39.88 39.81 23 38.91 39.16 39.46 39.66 39.67 39.42 39.61 39.71 39.82 39.89 39.80 24 38.90 39.18 39.45 39.66 39.68 39.43 39.61 39.71 39.80 39.90 39.77 25 38.93 39.20 39.44 39.65 39.68 39.41 39.61 39.74 39.81 39.90 39.77 26 38.96 39.21 39.47 39.65 39.66 39.40 39.60 39.73 39.84 39.90 39.74 27 38.97 39.23 39.46 39.68 39.67 39.40 39.61 39.74 39.84 39.94 39.74 28 38.97 39.23 39.47 39.72 39.62 39.40 39.60 39.76 39.85 39.94 39.74 29 38.96 39.25 39.49 39.61 39.44 39.61 39.78 39.88 39.90 39.17 30 38.98 39.25 39.50 39.57 39.46 39.61 39.78 39.88 39.90 39.77 31 39.25 39.51 39.54 39.61 39.88 39.92 LOW 39.25 39.51 39.72 39.78 39.54 39.61 39.78 39.88 39.95 39.92 HIGH 38.98 39.25 39.54 39.54 39.38 39.46 39.62 39.77 39.83 39.70 38 1- 4( wo w w 39 > LA.1 in 40 czz ha< 41C 41 ONDJ FMAMJ J ASONDJ FMAMJ J ASONDJ FMAMJ J AS 1986 1987 1988 1989 386 GROUND-WATER LEVELS RIO CULEBRINAS BASIN 182018066593200. Local number, 83. LOCATION.--Lat 18°20'18", long 66°59'32". Owner: P.R. Energy and Power Authority. Name: San Sebastian Well. AQUIFER.--San Sebastian Formation. WELL CHARACTERISTICS.--Drilled observation well, diameter 6 in (0.15 m), cased 6 in (0.15 m). Depth 300 ft (91.4 m). DATUM.--Elevation of land-surface datum is about 230 ft (70.1 m) above mean sea level, from topographic map. Measuring point: Shelter floor on top of 6 in (0.15 m) casing, 2.75 ft (0.84 m) above land-surface datum. Prior November 1985, top of casing, 2.40 ft (0.73 m) above land-surface datum. REMARKS.--Recording observation well. Formerly published as 182032066591800. PERIOD OF RECORD.--May 1967 to January 16, 1985. November 1985 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 21.95 ft (6.69 m) below land-surface datum, May 8, 1986; lowest water level recorded, 40.20 ft (12.25 m) below land-surface datum, Jan. 29, 1986. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1988 TO SEPTEMBER 1989 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 27.33 27.04 28.74 29.38 30.03 29.90 29.61 28.37 28.30 27.17 27.91 27.12 2 27.20 27.15 28.75 29.41 30.04 29.72 29.30 28.37 28.29 27.44 27.95 27.21 3 27.21 27.27 28.79 29.42 30.06