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Water Resources Data Puerto Rico and the U.S. Virgin Islands Water Year 1994 St Thomas I St John I Isla de Vieques PUERTO RICO U. S. V I R G I N ISLANDS Saint Croix I U.S. GEOLOGICAL SURVEY WATER-DATA REPORT PR-94-1 Prepared in cooperation with the Commonwealth of Puerto Rico, the Government of the U.S. Virgin Islands and other agencies CALENDAR FOR WATER YEAR 1994 1993 OCTOBER S M T W T F S 1 2 3456789 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 NOVEMBER S M T W T F S 123456 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 1234 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 1994 JANUARY S M T W T F S 1 2345678 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 APRIL S M T W T F S 1 2 3456789 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 JULY S M T W T F S 1 2 3456789 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 L 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 2.1 22 23 24 25 26 27 28 MAY S M T W T F S 1234567 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 AUGUST S M T W T F S 123456 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MARCH 5 M T W T F S 12345 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 JUNE S M T W T F S 1234 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 SEPTEMBER S M T W T F S 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 >L3. Water Resources Data Puerto Rico and the U.S. Virgin Islands Water Year 1994 by P.L. Diaz, Z. Aquino, C. Figueroa-Alamo, R.J. Vachier, and A.V. Sanchez St Thomas I Isla de lP Culebra Isla de Vieques PUERTO RICO St John I U. S. V I R G I N ISLANDS Saint Croix I U.S. GEOLOGICAL SURVEY WATER-DATA REPORT PR-94-1 Prepared in cooperation with the Commonwealth of Puerto Rico, the Government of the U.S. Virgin Islands and other agencies U.S. DEPARTMENT OF THE INTERIOR BRUCE BABBITT, Secretary U.S. GEOLOGICAL SURVEY Gordon P. Eaton, 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 GSA Center, 651 Federal Drive Suite 400-15 Guaynabo, Puerto Rico 00965 (Telephone: (809) 749-4346) 1995 PREFACE This annual hydrologic data report of Puerto Rico and the U.S. Virgin Islands is one of a series of annual reports that document hydrologic data gathered from the U.S. Geological Survey's surface- and ground-water data-collection networks in each state, Puerto Rico, the U.S. Virgin Islands, and the other Trust Territories. These records of streamflow, ground-water levels, and quality of water provide the hydrologic information needed by state, local and Federal agencies, and the private sector for developing and managing our Nation's land and water resources. The report is the culmination of a concerted effort by dedicated personnel of the U.S. Geological Survey, Water Resources Division who collected, compiled, analyzed, verified, and organized the data, and who typed, edited, and assembled the report. In addition to the authors, who had primary responsibility for assuring that the information contained herein is accurate, complete and adheres to Geological Survey policy and established guidelines, the following personnel contributed significantly to the collection, processing and tabulations of the data: Jose" M. Agis George Arroyo Angel Class-Cacho Iris M. Concepci6n Angel G. Ferrer Eduardo Figueroa Pedro Galindo Jose" Gonzalez Evelyn S. Guevara Sene"n Guzman-Rios Sandra Lagares Ernesto Mangual Carlos Narvaez Rafael Pena-Cortez Francisco P6rez-Blair Carlos C. Rodnguez Julio A. Rodnguez Miguel Rodnguez Jose" Rone" Sanchez Luis Santiago-Rivera Carlos Santos Luis Soler Heriberto Torres-Sierra Jose" A. Torres 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 Alien L. Zack, District Chief, Caribbean District, San Juan, Puerto Rico. REPORT DOCUMENTATION PAGE Form Approved OMBNo. 0704-0188 [ Public reporting burden for this collection of Information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources. i gathering and maintaining the data needed, and completing and teviewmg the coliection of information. Sand comments regarding fhis burden estimate or any other aspect of this I collection of information, Including suggestions for reducing this burden, to Washington Headquarters Services, Directorate ror Information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302, and to the Office of Management and Budget, Paperwork Reduction Project (0704-0188), Washington, DC 20503. 1. AGENCY USE ONLY (Leave blank) 2. REPORT DATE April 1995 3. REPORT TYPE AND DATES COVERED Annual - October 1, 1993 to September 30, 1994 4. TITLE AND SUBTITLE Water Resources Data for Puerto Rico and the U.S. Virgin Islands Water Year 1994 Pedro L. Diaz, Zaida Aquino, Carlos Figueroa-Alamo, Ricardo J. Vachier, Ana V. Sanchez 7 . P£Wl="61^MiNGl5^^ U.S. Geological Survey, Water Resources Division GSA Center, 651 Federal Drive, Suite 400-15 Guaynabo, Puerto Rico 00965 5. FUNDING NUMBERS 8. PERFORMING ORGANIZATION REPORT NUMBER USGS-WDR-PR-94-1 9. SPONSORING / MONITORING AGENCY NAME(S) AND ADDRESS(ES) I U.S. Geological Survey, Water Resources Division | GSA Center, 651 Federal Drive, Suite 400-15 | Guaynabo, Puerto Rico 00965 10. SPONSORING / MONITORING AGENCY REPORT NUMBER USGS/WRD/HD-95/280 11. SUPPLEMENTARY NOTES Prepared in cooperation with the Commonwealth of Puerto Rico, the Government of the U.S. Virgin Islands, and other agencies. 12a. DISTRIBUTION / AVAILABILITY STATEMENT NO RESTRICTION ON DISTRIBUTIONS 12b. DISTRIBUTION CODE | 13. ABSTRACT (Maximum 200 words) Water resources data for surface-water, quality-of-water, and ground-water records for the 1994 water year for Puerto Rico and the U.S. Virgin Islands consists of records of discharge, water quality of streams, and water levels j of wells. This report contains discharge records for 76 streamflow-gaging stations; stage only for 5 gaging stations, daily sediments records for 22 streamflow stations; 94 partial-record or miscellaneous streamflow stations; stage records for 11 reservoirs; water-quality records for 16 streamflow-gaging stations, 42 ungaged streamsites, 11 lake sites, 2 lagoons, and 1 bay; and water-level records for 62 observation 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. 14. SUBJECT TERMS I 15. NUMBER OF PAGES *Surface water, *Water quality, *Ground water, Aquifers, Chemical analysis, Gaging stations, Hydrologic data, Sediments, Streamflow, Water analysis, Water levels, Lakes 17. SECURITY CLASSIFICATION OF REPORT Unclassified 18. SECURITY CLASSIFICATION OF THIS PAGE Unclassified 19. SECURITY CLASSIFICATION OF ABSTRACT 20. LIMITATION OF ABSTRACT NSN 7540-01-280-5500 Standard Form 298 (Rev. 2-89) Prescribed by ANSI Std 239-18 298-102 CONTENTS Page Preface .............................................................................. iii List of surface-water and water-quality stations, in downstream order, for which records are published in this volume ........................................ vii List of ground-water wells, by basin, for which records are published in this volume ............................................................. xii List of discontinued surface-water discharge or stage-only stations .................................... xv Introduction .......................................................................... 1 Cooperation .......................................................................... 2 Summary of hydrologic conditions ........................................................... 3 Precipitation ...................................................................... 3 Surface water ..................................................................... 3 Ground water ..................................................................... 5 Water quality ..................................................................... 8 Special networks and programs ............................................................. 9 Explanation of records ................................................................... 9 Station identification numbers .......................................................... 10 Downstream order system ......................................................... 10 Latitude-longitude system ......................................................... 10 Records of stage and water discharge ..................................................... 20 Data collection and computation .................................................. 20 Data Presentation ............................................................ 21 Station manuscript .......................................................... 21 Data table of daily mean values ................................................. 22 Statistics of monthly mean data ................................................. 23 Summary statistics .......................................................... 23 Identifying estimated daily discharge ................................................. 24 Accuracy of the records .......................................................... 24 Records of surface-water quality ........................................................ 25 Classification of records .......................................................... 25 Arrangement of records .......................................................... 25 On-site measurements and sample collection ............................................ 25 Water temperature .............................................................. 26 Sediment .................................................................... 26 Laboratory measurements ......................................................... 26 Data presentation ............................................................... 27 Remark codes ................................................................. 28 Records of ground-water levels ......................................................... 28 Data collection and computation .................................................... 28 Data presentation ............................................................... 29 Records of ground-water quality ........................................................ 29 Data collection and computation .................................................... 30 Data presentation ............................................................... 30 Access to WATSTORE data ............................................................... 30 Definition of terms ...................................................................... 31 Publications on Techniques of Water-Resources Investigations ....................................... 41 Surface- and quality-of-water records for Puerto Rico ............................................. 45 Discharge at partial-record stations in Puerto Rico ............................................... 403 Water-quality at partial-record stations in Puerto Rico ............................................ 415 Ground-water records for Puerto Rico ....................................................... 425 Surface-water records for the U.S. Virgin Islands ............................................... 481 Ground-water records for the U.S. Virgin Islands ............................................... 501 Index .............................................................................. 509 VI ILLUSTRATIONS Page Figure 1. Graph showing monthly-mean discharge of selected streams in Puerto Rico ...................... 4 2. Graph showing ground-water levels at selected wells in Puerto Rico and the U.S. Virgin Islands ............................................................... 7 3. Map showing location of fecal coliform bacteria concentration at sampled sites .................. 11 4. Map showing location of fecal streptococci bacteria concentration at sampled sites ................ 12 5. Map showing location of surface-water stations in Puerto Rico .............................. 13 6. Map showing location of water-quality stations in Puerto Rico .............................. 14 7. Map showing location of low-flow partial-record stations in North-central 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. Map showing location of surface-water stations in Vieques Island ........................... 19 12. Grid showing system for numbering wells and miscellaneous site (latitude and longitude) .......... 20 13. Map showing the Rfo Guajataca basin .............................................. 47 14. Map showing the Rfo Camuy basin ................................................ 55 15. Map showing the Rfo Grande de Arecibo basin ........................................ 59 16. Map showing the Rfo Grande de Manatf basin ......................................... 85 17. Map showing the Rfo Cibuco basin ............................................... 105 18. Map showing the Rfo de la Plata basin ............................................. 113 19. Map showing the Rfo Hondo to the Rfo Puerto Nuevo basins ............................. 145 20. Map showing the Rfo Grande de Lofza basin ......................................... 177 21. Map showing northeastern river basins the Rfo Herrera to the Rfo Antdn Rufz basins ............ 299 22. Map showing southeastern river basins the Rfo Humacao to the Rfo Seco basins ................ 315 23. Map showing south coast river basins the Rfo Salinas to the Rfo Jacaguas basins ............... 331 24. Map showing south coast river basins the Rfo Inabdn to the Rfo Loco basins .................. 347 25. Map showing the Rfo Guanajibo basin ............................................. 367 26. Map showing the Rfo Yagiiez and the Rfo Grande de Afiasco basins ........................ 383 27. Map showing the Rfo Culebrinas basin ............................................. 395 TABLES Page Table 1. Island-wide monthly precipitation and annual averages for 1994 water year and the 30-year reference period, 1961-90 .............................................. 3 2. Highest water level recorded during 1994 water year and previous high water level (in feet below land-surface datum) at selected ground-water wells in Puerto Rico and the U.S. Virgin Islands ............................................ 6 3. Surface-water quality stations in Puerto Rico with highest concentration of selected constituents during water year 1994 ......................................... 8 4. Factors for conversion of chemical constituents in milligrams per liter to milli- equivalents per liter .......................................................... 35 VII SURFACE-WATER AND WATER-QUALITY STATIONS, IN DOWNSTREAM ORDER, v ' ' FOR WHICH RECORDS ARE PUBLISHED IN THIS VOLUME (Letter after station name designates type of data: (d) discharge, (c) chemical, (b) biological, (s) sediment, (p) pesticide, (e) elevation, gage heights) Station number Page RIO GUAJATACA BASIN Rio Guajataca at Lares (d,c,b) .......................................... 50010500 48 Canal Principal de Diversiones at Lago Guajataca (c,b) ........................ 50011000 51 Rio Guajataca above mouth near Quebradillas (c,b) ........................... 50011400 53 RIO CAMUY BASIN Rio Camuy at Tres Pueblos Sinkhole (d) ................................... 50014600 56 Rio Camuy near Bayaney (d) ........................................... 50014800 57 Rio Camuy near Hatillo (d) ............................................ 50015700 58 RIO GRANDE DE ARECIBO BASIN Lago Garzas near Adjuntas (e) ...................................... 50020100 60 Rio Grande de Arecibo near Adjuntas (c,b) ................................. 50020500 61 Rio Grande de Arecibo near Utuado (c,b) .................................. 50025000 63 Rio Saliente at Coabey near Jayuya (d) ................................ 50025155 65 Rio Caonillas above Lago Caonillas near Jayuya (c,b) ............................. 50026050 66 Lago Caonillas at Caonillas (e) ...................................... 50026140 68 Rio Grande de Arecibo below Lago Dos Bocas near Florida (c,b) ................. 50027250 69 Rio Grande de Arecibo above Arecibo (d) .................................. 50027750 71 Rio Tanam£ near Utuado (d,c,b,s) .................................... 50028000 72 Rio Tanam£ at Charco Hondo (d) .................................... 50028400 81 Rio Grande de Arecibo at Central Cambalache (c,b) ........................... 50029000 82 RIO GRANDE DE MANATI BASIN Rio Orocovis at Orocovis (d) ........................................ 50030460 86 Rfo Orocovis near Orocovis (c,b) ..................................... 50030700 87 Rio Grande de Manatf near Morovis (d,c,b) ................................. 50031200 89 Lago El Guineo at Damsite (e) ...................................... 50032290 92 Lago Matrallas at Damsite (e) ....................................... 50032590 93 Rio Bauta near Orocovis (d) ........................................ 50034000 94 Rio Grande de Manatf at Ciales (d) ....................................... 50035000 95 Rio Grande de Manatf at Highway 149 at Ciales (c,b) .......................... 50035500 96 Rio Cialitos at Highway 649 at Ciales (c,b) ............................. 50035950 98 Rio Grande de Manatf at Highway 2 near Manatf (d,c,b,p) ...................... 50038100 100 LACUNA TORTUGUERO BASIN Laguna Tortuguero Outlet near Vega Baja (c,b) .............................. 50038200 105 RIO CIBUCO BASIN Rfo Cibuco below Corozal (d,c,b) ........................................ 50038320 106 Rio Cibuco at Vega Baja (d,c,b) ......................................... 50039500 109 RIO DE LA PLATA BASIN Lago Carite at Gate Tower (e) .......................................... 50039990 114 Rfo de La Plata at Proyecto La Plata (d,c,b) ................................. 50043000 115 Rfo de La Plata at Comedo (d,s) ........................................ 50043800 118 VIII Vl SURFACE-WATER AND WATER-QUALITY STATIONS, IN DOWNSTREAM ORDER, FOR WHICH RECORDS ARE PUBLISHED IN THIS VOLUME-Continued Station number Page Rio de La Plata near Comedo (c,b) ....................................... 50044000 125 Rio Guadiana at Guadiana (d,s) ...................................... 50044830 127 Rio Guadiana near Naranjito (c,b) .................................... 50044850 133 Lago La Plata at Damsite (e) ........................................... 50045000 135 Rio de La Plata below La Plata Dam (d,s) .................................. 50045010 136 Rio de La Plata at Highway 2 near Toa Alta (d,c,b,s,p) ......................... 50046000 142 RIO HONDO BASIN Rio Hondo at Flood Channel near Catano (c,b) .............................. 50047530 146 RIO DE BAYAMON BASIN Lago de Cidra at Damsite near Cidra (e) ................................... 50047550 148 Rio de Bayam6n below Cidra Dam (d,s) ................................... 50047560 149 Rio de Bayam6n near Aguas Buenas (c,b) .................................. 50047600 155 Rio de Bayam6n near Bayam6n (d) ...................................... 50047850 157 Rio Guaynabo near Bayamdn (c,b) .................................... 50047990 158 Rio de Bayamdn at Flood Channel at Bayamdn (c,b,p) ......................... 50048510 160 RIO PUERTO NUEVO BASIN Rio Piedras: Rio Piedras at El Senorial (d,s) .......................................... 50048770 162 Rio Piedras near Rio Piedras (c,b,p) ...................................... 50048800 169 Rio Piedras at Hato Rey (d,c,b) ......................................... 50049100 171 Laguna San Jos6: Laguna San Jos6 No 2 at San Juan (c,b) ................................... 50049820 174 Bahia de San Juan: Bahia de San Juan No 5 at San Juan (c,b) .................................. 50049920 175 QUEBRADA BLASINA BASIN Quebrada Blasina near Carolina (c,b) ..................................... 50050300 178 RIO GRANDE DE LOIZA BASIN Rio Grande de Loiza at Quebrada Arenas (d) ................................ 50050900 180 Quebrada Blanca at El Jagual (d,s) .................................... 50051150 181 Quebrada Salvatierra near San Lorenzo (d,s) ............................. 50051180 187 Rio Cayaguas at Cerro Gordo (d) ..................................... 50051310 193 Rio Grande de Loiza at Highway 183 near San Lorenzo (d,s) .................... 50051800 194 Rio Turabo above Borinquen (d,s) .................................... 50053025 201 Rio Grande de Loiza at Caguas (d,c,b,s) ................................... 50055000 207 Rio Caguitas near Aguas Buenas (d,s) ................................. 50055100 216 Rio Caguitas near Caguas (d,s) ...................................... 50055170 222 Rio Caguitas at Villa Blanca at Caguas (d,s) ............................. 50055225 237 Rfo Caguitas at Highway 30 at Caguas (c,b) ............................. 50055250 243 Rio Bairoa at Bairoa (d,s) .......................................... 50055390 245 Rfo Bairoa near Caguas (c,b) ........................................ 50055400 252 IX SURFACE-WATER AND WATER-QUALITY STATIONS, IN DOWNSTREAM ORDER, FOR WHICH RECORDS ARE PUBLISHED IN THIS VOLUME-Continued Station number Page Rio Gurabo: Rfo Gurabo below El Mang6 (d,s) .................................... 50055750 254 Rio Valenciano near Juncos (d,s) .................................. 50056400 261 Rio Gurabo at Gurabo (d,s) ......................................... 50057000 268 Rfo Gurabo near Gurabo (c,b) ....................................... 50057025 279 Rfo Canas at Rfo Canas (d,s) ........................................ 50058350 281 Lago Lofza at Damsite (c,b,e) .......................................... 50059000 288 Rfo Grande de Lofza below Damsite (d,s) .................................. 50059050 290 Rfo Grande de Lofza below Trujillo Alto (c,b) ............................... 50059100 295 Rfo Grande de Lofza at Carolina (e) ...................................... 50061000 297 Rfo Can6vanas near Campo Rico (d) .................................. 50061800 298 RIO ESPIRITU SANTO BASIN Quebrada Sonadora near El Verde (d) ................................. 50063440 300 Quebrada Toronja at El Verde (d) .................................... 50063500 301 Rio Espfritu Santo near Rfo Grande (d,c,b) ................................. 50063800 302 Rfo Grande near El Verde (d) ....................................... 50064200 305 RIO MAMEYES BASIN Rfo Mameyes near Sabana (d) .......................................... 50065500 306 RIO SABANA BASIN Rfo Sabana at Sabana (d) .............................................. 50067000 307 RIO FAJARDO BASIN Rfo Fajardo near Fajardo (d,c,b,p) ........................................ 50071000 308 Rfo Fajardo below Fajardo (c,b) ......................................... 50072500 311 RIO BLANCO BASIN Quebrada Guaba" near Naguabo (d) ....................................... 50074950 313 Rfo Icacos near Naguabo (d) ........................................... 50075000 314 RIO HUMACAO BASIN Rfo Humacao at Las Piedras (d) ......................................... 50081000 316 Rfo Humacao at Highway 3 at Humacao (c,b) ............................... 50082000 317 RIO GUAYANES BASIN Rfo Guayan6s at Yabucoa (c,b,p) ........................................ 50083500 319 Rfo Guayanes above mouth at Playa de Guayanes (c,b) ......................... 50086500 321 RIO MAUNABO BASIN Rfo Maunabo at Lizas (d) ............................................. 50090500 323 Rfo Maunabo at Maunabo (c,b) ......................................... 50091000 324 RIO CHICO BASIN Rfo Chico at Providencia (c,b) .......................................... 50091800 326 RIO GRANDE DE PATILLAS BASIN Rfo Grande de Patillas near Patillas (d,c,b) ................................. 50092000 328 RIO SALINAS BASIN Rfo Lapas near Rabo del Buey (d) ....................................... 50100200 332 Rfo Majada at La Plena (d) ............................................ 50100450 333 SURFACE-WATER AND WATER-QUALITY STATIONS, IN DOWNSTREAM ORDER, FOR WHICH RECORDS ARE PUBLISHED IN THIS VOLUME-Continued Station number Page RIO COAMO BASIN Rio Coamo at Coamo (d) .............................................. 50106100 334 Rio Coamo near Coamo (c,b) ........................................... 50106500 335 RIO DESCALABRADO BASIN Rfo Descalabrado near Los Llanos (d) ..................................... 50108000 337 RIO JACAGUAS BASIN Rio Toa Vaca above Lago Toa Vaca (d,s) ............................... 50110900 338 Rio Jacaguas at Juana Diaz (d) .......................................... 50111500 345 RIO INABON BASIN Rio Inab6n at Real Abajo (d) ........................................... 50112500 348 RIO BUCANA BASIN Rio Bucan&: Rio Cerrillos above Lago Cerrillos near Ponce (d) ............................ 50113800 349 Lago Cerrillos at Damsite near Ponce (e) ................................... 50113950 350 Rio Cerrillos near Ponce (d,c,b) ......................................... 50114000 352 Rfo Bucan* at Hwy 14 Bridge near Ponce (d) ............................... 50114390 355 RIO PORTUGUES BASIN Rfo Portugue"s near Ponce (d,c,b) ........................................ 50115000 356 Rfo Portugue's at Ponce (c,b,p) .......................................... 50116200 359 RIO GUAYANILLA BASIN Rfo Guayanilla near Guayanilla (d) ....................................... 50124200 361 Rfo Guayanilla at Central Rufina (c,b,p) ................................... 50124700 362 RIO YAUCO BASIN Lago Luchetti at Damsite (e) ........................................... 50125780 364 RIO LOCO BASIN Rfo Loco at Guanica (c,b,p) ............................................ 50129700 365 RIO GUANAJIBO BASIN Rfo Guanajibo at Highway 119 at San German (d) ............................ 50131990 368 Rfo Guanajibo near San German (c,b) ..................................... 50133600 369 Rfo Rosario near Hormigueros (d,c,b,s) ................................ 50136400 371 Rfo Guanajibo near Hormigueros (d,c,b,p) .................................. 50138000 380 RIO YAGUEZ BASIN Rfo Yaguez near Mayagiiez (c,b) ........................................ 50138800 384 RIO GRANDE DE ANASCO BASIN Lago Guayo near Castaner (e) ....................................... 50141500 386 Rfo Grande de Anasco near Lares (c,b) .................................... 50143000 387 Rfo Grande de Anasco near San Sebastian (d,c,b,s) ............................ 50144000 389 Rfo Grande de Aftasco near Anasco (c,b,p) ................................. 50146000 392 RIO CULEBRINAS BASIN Rfo Culebrinas near San Sebastian (c,b) ................................... 50147600 396 Rfo Culebrinas at Highway 404 near Moca (d) ............................... 50147800 398 Rfo Culebrinas near Aguada (c,b,p) ....................................... 50149100 399 SURFACE-WATER AND WATER-QUALITY STATIONS, IN DOWNSTREAM ORDER, FOR WHICH RECORDS ARE PUBLISHED IN THIS VOLUME-Continued Station number Page VIEQUES, P.R. Quebrada La Mina near Esperanza (e) ..................................... 50232000 401 Quebrada Pil6n at Colonia Puerto Real (e) .................................. 50233000 402 ST THOMAS, US VIRGIN ISLANDS Bonne Resolution Gut at Bonne Resolution (d) .............................. 50252000 482 Turpentine Run at Mount Zion (d) ....................................... 50274000 483 ST JOHN, US VIRGIN ISLANDS Lameshur Bay Gut at Lameshur (d,s) ..................................... 50292600 484 Fish Bay Gut at Fish Bay (d,s) .......................................... 50294000 490 Guinea Gut at Bethany (d) ............................................. 50295000 497 ST CROIX, US VIRGIN ISLANDS River Gut at Hwy 66 at Fairplanes (d) .................................... 50333700 498 Bethlehen Gut at Hwy 66 at Fairplanes (d) ................................. 50334500 499 Jolly Hill Gut at Jolly Hill (d) .......................................... 50345000 500 Discharge at partial-record stations and miscellaneous sites Low-flow partial-record stations .......................................... 404 Analyses of samples collected of water-quality partial-record stations and miscellaneous sites ....................................... 416 XII * GROUND-WATER WELLS, BY BASIN, FOR WHICH RECORDS ARE PUBLISHED RIO GUAJATACA BASIN Well 182422067015100 Local number 165 ................................................. 426 Well 182647066552400 Local number 202 ................................................. 427 RIO GRANDE DE ARECIBO BASIN Well 182737066370900 Local number 204 ................................................. 428 RIO GRANDE DE MANATI BASIN Well 182757066325600 Local number 206 ................................................. 429 Well 182710066303700 Local number 207 ................................................. 430 Well 182308066260400 Local number 210 ................................................. 431 RIO CIBUCO BASIN Well 182647066201700 Local number 70 .................................................. 432 Well 182615066235300 Local number 211 ................................................. 433 Well 182515066194000 Local number 212 ................................................. 434 Well 182330066185700 Local number 213 ................................................. 435 RIO DE LA PLATA BASIN Well 182746066170800 Local number 214 ................................................. 436 Well 182530066135400 Local number 216 ................................................. 437 Well 182655066142400 Local number 217 ................................................. 438 RIO HONDO TO RIO PUERTO NUEVO BASINS Well 182623066111000 Local number 218 ................................................. 439 Well 182441066082600 Local number 219 ................................................. 440 Well 182413066044000 Local number 220 ................................................. 441 Well 182511066045401 Local number PN-2 ................................................ 442 Well 182435066052701 Local number PN-5 .................................................... 443 Well 182445066043401 Local number PN-6 ................................................ 444 Well 182437066040501 Local number PN-7 .................................................... 445 Well 182443066041502 Local number PN-8c ............................................... 446 Well 182417066042700 Local number PN-10 ............................................... 447 Well 182349066032600 Local number PN-13 ............................................... 448 Well 182406066034700 Local number PN-19 ............................................... 449 RIO GRANDE DE LOIZA BASIN Well 181550065593201 Local number 50 .................................................. 450 Well 182515065594100 Local number 222 ................................................. 451 Well 181513065554601 Local number CJ-TW3B ............................................. 452 Well 181352066025300 Local number CJ-TW19A ............................................ 453 RIO HUMACAO TO RIO SECO BASINS Well 175858066100200 Local number 6 ................................................... 454 Well 180415065513900 Local number 96 .................................................. 455 GROUND-WATER WELLS, BY BASIN, FOR WHICH RECORDS ARE PUBLISHED-Continued * '" Page RIO SALINAS TO RIO JACAGUAS BASINS Well 175829066232200 Local number 87 .................................................. 456 Well 180002066132200 Local number HW-TW-01 ........................................... 457 Well 180001066122002 Local number HW-TW-03C .......................................... 458 Well 175947066130601 Local number HW-TW-05B .......................................... 459 Well 175957066123400 Local number HW-TW-13 ........................................... 460 Well 175946066102000 Local number HW-TW-14 ........................................... 461 Well 180206066135500 Local number RM-05 ............................................... 462 Well 180104066152300 Local number RM-10 ............................................... 463 RIO INABON TO RIO LOCO BASINS Well 180133066503300 Local number 132 ................................................. 464 Well 175900066354200 Local number 141 ................................................. 465 RIO GUANAJIBO BASIN Well 180132067033800 Local number 143 ................................................. 466 Well 180627067080600 Local number CR-TW-1 ............................................. 467 Well 180628067075800 Local number CR-TW-2A ............................................ 468 Well 180628067075801 Local number CR-TW-2B ............................................ 469 Well 180628067075802 Local number CR-TW-2C ............................................ 470 Well 180643067080400 Local number CR-TW-3 ............................................. 471 Well 180650067073700 Local number CR-TW-4 ............................................. 472 Well 180557067083100 Local number CR-TW-5 ............................................. 473 Well 180617067083300 Local number CR-TW-6 ............................................. 474 Well 180604067085100 Local number CR-TW-7 ............................................. 475 Well 180547067084800 Local number CR-TW-8 ............................................. 476 Well 180628067084300 Local number CR-TW-9A ............................................ 477 Well 180547067073100 Local number CR-TW-10 ............................................ 478 RIO CULEBRINAS BASIN Well 182442067091700 Local number 200 ................................................. 479 ST. CROIX, U.S. VIRGIN ISLANDS Well 174225064472000 Local number 2 ................................................... 502 Well 174243064475100 Local number 3 ................................................... 503 Well 174316064480800 Local number 13 .................................................. 504 XIV GROUND-WATER WELLS, BY BASIN, FOR WHICH RECORDS ARE PUBLISHED-Continued Page ST. THOMAS, U.S. VIRGIN ISLANDS Well 182038064550300 Local number 6 ................................................... 505 Well 182038064580000 Local number 8 ................................................... 506 ST. JOHN, U.S. VIRGIN ISLANDS Well 181956064464500 Local number 11 .................................................. 507 Well 182048064430400 Local number 14 .................................................. 508 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1994 DISCONTINUED STREAMFLOW STATIONS The following continuous-record streamflow stations in Puerto Rico and the U.S. Virgin Islands have been discontinued or converted to partial-record stations. Daily streamflow or stage records were collected for the period of record shown for each station. XV Station number 50007000 50010600 50011000 50011200 50011400 50013000 50014000 50016000 50021000 50021050 50021500 50023000 50027200 50029000 50031500 50035200 50035950 50038360 50038600 50038700 50038900 50039600 50043200 50043400 50044600 50044650 50044800 50045700 50047535 50047540 50047820 50048000 50049310 50053050 50054000 50055650 50056000 50056900 50058300 50059000 50061300 50062500 50063300 50065700 50072000 50073200 50073400 50074000 50075500 50076000 50077000 50077400 50078500 50081500 50082000 50082200 50082800 50083500 50084000 50085100 Station name Quebrada de los Cedros near Isabela Rio Guajataca above Lago de Guajataca Canal Diversion Lago Guajataca Rio Guajataca below Lago Guajataca Rio Guajataca above mouth near Quebradillas Rio Camuy near Lares Rio Criminales near Lares Rio Camuy near Camuy Rio Pellejas at Central Pellejas Rio Pellejas below Central Pellejas Rio Pellejas near Utuado Rio Vivi near Central Pellejas Rio Grande de Arecibo blw. Lago dos Bocas Rio Grande de Arecibo at Central Cambalache Rio Sana Muerto near Orocovis Rio Grande de Manati at Hwy 145 at Ciales Rio Cialitos at Hwy 649 at Ciales Rio Mavilla near Corozal Rio Unib6n near Morovis Rio Morovis at Morovis Rio Indio at Vega Baja Rio Cibuco at Central San Vicente Rio Usabon near Barranquitas Rio Aibonito Tributary near Aibonito Rio Guadiana near Naranjito Quebrada del Toro near Naranjito Quebrada Anones near Naranjito Rio Lajas at Toa Alta Rio de Bayam6n at Arenas Rio Sabana at Vista Monte Rio de Bayam6n at Hwy 174 near Bayam6n Rio de BayanuSn at Bayam6n Quebrada Josefina at Pifiero Avenue Rio Turabo at Borinquen Quebrada de las Quebradillas near Caguas Quebrada Caimito near Juncos Rio Valenciano near Las Piedras Quebrada Mamey near Gurabo Quebrada Arena near Caguas Rio Piedras at Rio Piedras Rio Canovanillas near Loiza Rio Herrera near Colonia Dolores Rio Espiritu Santo near El Verde Rio Mameyes at Hwy 191 at Mameyes Rio Fajardo at Fajardo Rio Daguao at Daguao Quebrada Palma at Daguao Rio Santiago at Naguabo Rio Blanco at Florida Rio Blanco near Florida Rio Blanco at Rio Blanco Rio Blanco at Colonia La Fe Rio Anton Ruiz at Central Pasto Viejo Rio Humacao near Humacao Rio Humacao at Hwy 3 at Humacao Rio Humacao near La Suiza Rio Guayanes near Colonia Laura Rio Guayanes near Yabucoa Rio Limones near Yabucoa Rio Guayanes at Central Roig Drainage area (mi a ) 7.62 4.68 5.46 7.89 9.55 5.66 169 200 3.68 132 17 9.51 5.29 1.26 9.15 1.13 1.73 0.54 2.32 8.65 0.45 0.80 31.90 71.90 3.84 7.89 6.25 0.82 6.85 2.30 12.5 14.40 2.75 2.23 11.80 21.60 2.26 4.84 4.99 11.00 12.30 17.60 18.80 4.33 9.23 17.30 19.90 4.69 17.20 7.89 26.60 Period of record 1970 1984-89 1970 1969-70,1984-87 1969-70,1984-89 1969-71 1969-70 1969-73 1968-70 1972-75 1969-71 1969-75 1970-71 1969-83 1965-70 1972 1970-82 1969-70 1969-70 1968 1963,66,71 1969-72 1968-69,71 1968-71 1971 1971 1971 1966-75 1992-93 1992-93 1966 1963-67 1988-91 1984-90 1969-71,73 1984-87 1971 1984-92 1971 1971-82,1987-93 1968-73 1968-72 1968-73 1967-85 1960-63 1966-82 1972-77 1966-82 1966-82 1983-85 1973-77 1967-70 1968 1973 1983-85 1965-66,1969-71 1969-82 1969-71 1969-71 1965-66,1968,70 XVI WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1993 DISCONTINUED STREAMFLOW STATIONS--Continued Station number 50086100 50086500 50087200 50091000 50091200 50091400 50091700 50091800 50094200 50094300 50094400 50095200 50095500 50099000 50106500 50106900 50107200 50108200 50108500 50111200 50111700 50111750 50112100 50112600 50113100 50113500 50114400 50114700 50115900 50116500 50119000 50121000 50122000 50124000 50124500 50125900 50126150 50128000 50129000 50129500 50129900 50130320 50136000 50141000 50145000 50147000 50214500 50215000 50231000 50276000 50295500 50332000 50333500 50337500 50348000 Station name Drainage area (mi * Rio del Ingenio at Comunas 5.50 Rio Guayan^s at Playa Guayan^s 34.00 Cafio Santiago near Central Roig 6.04 Rio Maunabo at Maunabo 12.40 Rio Maunabo near Maunabo 12.70 Rio Jacaboa near Lamboglia 4.13 Rio Chico at Patillas 6.82 Rio Chico at Providencia 4.90 Rio Grande de Patillas at Patillas 27.90 Rio Grande de Patillas at Providencia 29.00 Rio Nigua at Pitahaya 5.86 Rio Guamani at Guayama 8.22 Rio Guamani near Guayama 12.30 Quebrada Aguas Verdes near Salinas 0.39 Rio Coamo near Coamo 46.00 Rio Coamo below Lago Coamo near Coamo 65.40 Rio Coamo at mouth near Santa Isabel 69.30 Rio Descalabrado at Las Ollas 13.90 Rio Descalabrado near Santa Isabel 18.10 Rio Toa Vaca near Villalba 21.40 Rio Jacaguas near Juana Diaz 53.20 Rio Jacaguas below Quebrada Guanabana 56.30 Rio Jacaguas near Ariis 59 . 60 Rio Inab6n at Goto Laurel Rio Guayo near Goto Laurel 11.80 Rio Inabon near Arus 30.20 Rio Bucanci near Ponce 25.60 Rio Bucanci near Playa de Ponce 28.40 Rio Portugu^s at Hwy 14 at Ponce Rio Portugues at Highway 2 Bypass at Ponce 20.50 Rio Matilde at Ponce 19.40 Rio Tallaboa at Pefiuelas 24.20 Rio Tallaboa at Tallaboa 31.50 Rio Guayanilla nr Guayanilla 18.50 Rio Guayanilla at Guayanilla 20.80 Rio Duey above Diversion near Yauco 8.93 Rio Yauco above Diversion Monserrate near Yauco 27.20 Rio Yauco near Yauco 45.50 Rio Loco near Yauco 8.50 Rio Loco near Guanica 21.00 Laguna Cartagena near Boguer6n Quebrada Mamey at Joyuda 0.38 Rio Rosario at Rosario 16.40 Rio Yahuecas near Adjuntas 15.40 Rio Grande de Aftasco at El Espino 108.00 Rio Culebrinas at San Sebastian 16.70 Quebrada Resaca near Monte Resaca, Culebra 0.23 Drainage Canal at Culebra Airport, Culebra 0.08 Quebrada Confresi Tributary near Isabel II, Viegues 0.28 Turpentine Run at Mariendal 2.97 Cruz Bay Gut at Cruz Bay, St. John, VI 0.09 River Gut at River 1.42 River Gut near Golden Grove 5.40 Gut 4.5 at Cane Valley 0.21 Salt River at Canaan 0.36 Period of record 1965-66,1968-69 1965-66,1968-71 1965-71 1965,67,1969-82 1971-72 1965-73 1965,1969-72 1965,1967-69,1971 1967,1969,1971 1971 1965,1969,1970-71,1973 1969-71 1969-70 1989 1967-68,1984-85,1986 1967-68 1967-68 1965,1967-71 1966-67 1966-70 1966-68 1989 1966-67 1967-71 1965, 1968-71 1964-65 1965-81 1964-67 1965-82 1964-65 1965-66 1959-82 1959-63 1961-69 1971-82 1977-80 1978-85 1962-64,1977-85 1963-67 1963-69 1984-86 1986-88 1975-86 1980-85 1959-66,1961-63 1960-82 1991-93 1991-93 1991-93 1963-69,1978-86 1992-93 1991-93 1990-93 1991-93 1991-93 50349000 Gut 10 near Altona 0.13 1991-93 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1994 1 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, 1994." This report includes records on both surface and ground water. Specifically, it contains: (1) Discharge records for 76 streamflow-gaging stations, stage only for 5 gaging stations, daily sediment records for 22 streamflow stations, 94 partial-record or miscellaneous streamflow stations, stage records for 11 reservoirs, and (2) water-quality records for 16 streamflow-gaging stations, and for 42 ungaged streamsites, 11 lake sites, 2 lagoons, and 1 bay; and (3) water-level records for 62 observation wells. Water-resources data for Puerto Rico for calendar years 1958-67 were released in a series of reports entitled "Water Records of Puerto Rico". Water-resources data for the U.S. Virgin Islands for the calendar years 1962-69 were released in a report entitled "Water Records of U.S. Virgin Islands." Included were records of streamflow, ground-water levels, and water-quality data for both surface and ground water. Beginning with the 1968 calendar year, surface-water records for Puerto Rico were released separately on an annual basis. Ground-water level records and water-quality data for surface and ground water were released in companion reports covering periods of several years. Data for the 1973-74 reports were published under separate covers. Water- resources data reports for 1975-76, 1977, 1978, 1979-80, 1981-82, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, and 1993 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-94-1." 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. Beginning with the 1990 water year, all water-data reports will also be available on Compact Disc-Read Only Memory (CD-ROM). All data reports published for the current water year for the entire Nation, including Puerto Rico and the Trust Territories, will be reproduced on a single CD-ROM disc. Additional information, including current prices, for ordering specific reports may be obtained from the District Chief at the address given on back of the title page or by telephone (809) 749-4346. A limited number of CD-ROM discs will be available for sale by the Books and Open-File Reports Section, U.S. Geological Survey, Federal Center, Box 25425, Denver, Colorado 80225. WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1994 COOPERATION The U.S. Geological Survey has had cooperative agreements with organizations of the Commonwealth of Puerto Rico and the Territory of the U.S. Virgin Islands for the systematic collections of water resources data since 1958. Organizations that supplied data are acknowledged in the station descriptions. Organizations that assisted in collecting data through cooperative agreements with the Survey are: Puerto Rico Environmental Quality Board Puerto Rico Aqueduct and Sewer Authority Puerto Rico Department of Agriculture Puerto Rico Industrial Development Company Puerto Rico Department of Housing Puerto Rico Highway Authority Puerto Rico Department of Natural Resources Puerto Rico Department of Health Puerto Rico Electric and Power Authority Puerto Rico Legislature Puerto Rico Civil Defense U.S. Department of the Interior, Office of Territorial and International Affairs U.S. Virgin Islands Department of Planning and Natural Resources Funds were also provided by the Corps of Engineers, U.S. Army, for the collection of records at seven gaging stations published in this report. WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1994 SUMMARY OF HYDROLOGIC CONDITIONS Precipitation Precipitation throughout Puerto Rico during the 1994 water year (October 1993 to September 1994) was significantly lower than normal. Rainfall averaged about 67 percent of normal, averaging 63 percent of normal in northern Puerto Rico, 69 percent of normal in southern Puerto Rico, 74 percent of normal in eastern Puerto Rico, and 64 percent of normal in western Puerto Rico. This below-normal rainfall condition caused a severe drought which affected the hole island of Puerto Rico in some degree. Monthly average rainfall islandwide for the 1994 water year and for the 30-year reference period 1951-1980 used to define normal rainfall, as reported by the National Oceanic and Atmospheric Administration, are listed in table 1. Table 1. Islandwide monthly rainfall and annual averages for the 1994 water year and the 30-year reference period, 1951-80 1994 Water Year 30-year normal Month (inches) (inches) OCT 3.74 7.74 NOV 6.07 5.95 DEC 2.33 4.32 JAN 2.13 3.08 FEE 2.17 2.35 MAR 2.43 2.62 APR 2.90 4.63 MAY 3.61 6.48 JUN 2.70 5.58 JUL 2.63 5.48 AUG 5.28 7.28 SEP 6.43 7.78 TOTAL 42.42 63.29 Surface Water Streamflow during 1994 water year was significantly below average throughout Puerto Rico, making it one of the driest years ever recorded at the four index stations. A comparison of the monthly-mean flows during 1994 water year, the long-term median of the monthly-mean flow, and the extreme monthly flows for the index stations on the Rio Grande de Anasco, the Rfo Grande de Manatf, the Rio Inabon, and the Rio Fajardo are shown in figure 1. The four index stations recorded monthly-mean flows well below the long-term median. In fact, some new historical minimum monthly- mean flows were established for these index stations for the period of record. WEST RIO GRANGE DE ANASCO NEAR SAN SEBASTIAN (50144000) 4,000 1,000 r 20 1993 SOUTH Rl'O INABON AT REAL ABAJO (50112500) 500 100 10 O N D 1993 NORTH RIO GRANGE DE MANATl' AT HWY 2 (50038100) 4,000 A M 1994 JFMAMJJAS EAST Rl'O FAJARDO NEAR FAJARDO Unshaded area indicates range between highest and lowest monthly-mean discharges for the period of record to water year 1994. Figure 1.-Monthly-mean discharge of selected streams in Puerto Rico. WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1994 ° Rainfall deficits since August 1993 reduced streamflow to major water-supply reservoirs, principally Lago Loiza, Lago de la Plata, and Lago de Cidra. This prolonged dry condition compelled the Puerto Rico Aqueduct and Sewer Authority to implement and emergency water rationing plan, which affected nearly 1.9 million residents in 25 towns. The most affected zone was San Juan metropolitan area with nearly 1.5 million inhabitants. In the northern area, streamflow at the index station on the Rio Grande de Manati at Highway 2, was 36 percent of the long-term median of monthly-mean flows during the entire period. This station recorded historical minimum monthly-mean flows for seven months: October, January, February, March, June, July, and September. In the eastern area, streamflow at the Rio Fajardo near Fajardo index station was also below the long-term median of monthly-mean flows with an average of 35 percent of normal. Four months recorded historical minimum monthly- mean flows for this station during the year. These were November, July, August, and September. In the southern area, monthly-mean flow at the Rio Inabon at Real Abajo index station was 45 percent of the long-term median of monthly-mean flows. Historical minimum monthly-mean flow was recorded for the month of October. In the western area, the Rio Grande de Afiasco near San Sebastian index station had monthly-mean flows of 70 percent of the long-term median of monthly-mean flows, being the area with highest streamflow for this year. Historical minimum monthly-mean flow was recorded for the month of November. Ground-Water Levels Ground-water levels in the major aquifers of Puerto Rico followed a seasonal trend associated with rainfall patterns during water year 1994. Water levels generally declined as below-normal rainfall was recorded islandwide. Record-low water levels were recorded at several wells in Puerto Rico and the U.S. Virgin Islands (table 2). Ground-water levels in the north coast limestone aquifer of Puerto Rico generally declined during the water year 1994 in response to below-normal rainfall and substained ground-water withdrawals. At the Sabana Hoyos index well (fig. 2), water level declined 1.5 feet from October 1993 to September 1994. Ground-water levels in the south coast alluvial aquifer followed a declining trend during this period of record. At the Alomar index well (fig. 2), the water level dropped 6.5 feet during water year 1994. The declining trend was accompanied by various fluctuations as ground-water withdrawals increased for public, irrigation, and industrial uses. Ground-water level in the Guinea Gut observation well in St. John, U.S. Virgin Islands, rose significantly during November 1993 in response to an intense rainfall event (fig. 2). However, the water levels declined during the rest of the 1994 water year as rainfall events became uncommon. The water levels in this well were about 6 feet lower at the end of the water year than at the beginning. 6 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1994 Table 2. Lowest ground-water levels recorded during year 1994 and previous low ground-water levels at selected wells in Puerto Rico and the U.S. virgin Islands. [PR, Puerto Rico; St.T, St. Thomas; St.J, St. John; mm-dd-yy, month-day-year; ft-blsd, feet below land-surface datum; mm-yy, month-year; +, above land-surface datum] Well name or number Gilberto River a Gelo Martinez Rosario No. 2 Ponderosa TW-1 Pampano No. 2 Dorado Beach No. 7 Navy -Campani 1 1 as Monserrate TW-2 Levittown No. 7 Ft . Buchanan No. 1 Salud Mental No. 1 Alsacia No. 2 Local number 204 210 211 212 213 214 216 217 218 219 PN-5 PN-6 Luis Mufioz Marin PN-8c 1C Las Americas No. 1 Jardin Botanico No. 1 Jardin Botanico No. 3 CJ-TW 3B CJ-TW 19A HW-TW-01 HW-TW-03C HW-TW-05B RM # 5 RM # 10 CR-TW-2C GOLDEN GROVE 6 VIEO-6 GUINEA GUT VIEO-4 PN-10 PN-13 PN-19 CJ-TW 3B CJ-TW 19A HW-TW-01 HW-TW-03C HW-TW-05B RM # 5 RM # 10 CR-TW-2C 3 8 11 14 1994 highest water level Date Location (ft-blsd) (mm-dd-yy) PR PR PR PR PR PR PR PR PR PR PR PR PR PR PR PR PR PR PR PR PR PR PR PR St.C St.T St.J St.J 52. 85. 195. 75. 61. 21. 18. 3. 10. 52. 32. 13. 16. 6. 17. 12. 20. 25. 31. 57. 23. 24. 35. 8. 36. 32. 28. 12. .59 .32 .88 .03 .17 .01 .40 .21 ,83 .66 ,82 .26 .10 .74 .82 .63 .31 .54 .98 .68 .95 .24 .77 .05 .76 .11 .45 .27 04-15-94 09-29-94 09-29-94 07-22-94 to 07-26-94 09-30-94 08-08-94 07-23-94 07-24-94 09-24-94 06-09-94 06-27-94 09-27-94 09-25-94 09-26-94 09-27-94 09-30-94 09-30-94 09-30-94 09-18-94 09-19-94 09-19-94 09-20-94 09-19-94 09-04-94 to 09-08-94 09-17-94 09-20-94 to 09-23-94 09-17-94 09-18-94 09-19-94 09-19-94 09-20-94 09-20-94 09-17-94 to 09-30-94 01-23-94 09-30-94 09-08-94 09-09-94 09-30-94 06-16-94 Previous highest water Period of level Date record (ft-blsd) (mm-dd-yy) (mm-yy) 52. 83. 193. 74. 61. 20. 14. 2. 9, 50. 30. 9, 15. 2. 17. 8. 18. 25. 31. 55. 22. 19. 35. 8. 35. 30. 25. 12. .56 .01 .73 .63 .13 .68 ,72 ,75 ,77 .40 ,23 ,04 46 ,48 ,08 ,23 40 ,25 45 24 ,14 ,87 ,56 ,03 .23 .09 .25 .06 04-26-93 09-29-92 05-16-92 to 05-23-92 10-27-86 10-28-86 11-03-92 05-16-92 04-28-86 04-25-93 04-26-93 04-27-93 03-23-86 08-30-93 05-21-92 03-31-93 04-28-92 04-29-92 10-26-89 10-27-89 04-16-92 04-28-92 05-01-92 05-02-92 05-15-92 05-16-92 05-17-92 05-21-92 05-22-92 09-30-93 09-05-90 06-14-90 08-28-90 08-29-90 08-12-93 11-23-92 11-24-92 09-30-93 10-02-85 09-04-92 10-86 10-85 10-85 10-85 10-85 11-85 10-85 11-85 10-85 12-85 4-89 7-89 2-89 10-89 3-89 6-91 9-91 9-91 4-88 12-88 4-88 3-89 3-89 3-89 6-92 3-82 10-91 3-82 5-91 to to to to to to to to to to to to to to to to to to to to to to to to to to to to to 9-94 9-94 9-94 9-94 9-94 9-94 9-94 9-94 6-94 9-94 9-94 9-94 9-94 9-94 9-94 9-94 9-94 9-94 9-94 9-94 9-94 9-94 9-94 9-94 1-94 9-94 9-94 9-94 7-94 25 30 2 Ld (J £ o: c/) o < «j Ld CD 35 WELL 70, SABANA HOYOS, PUERTO RICO OCT NOV DEC JAN FED MAR APR MAY JUN JUL AUG SEP 1993 1994 Ld y o:i WELL 87, ALOMAR 1, PUERTO RICO OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1993 1994 WELL 11, GUINEA GUT ST. JOHN, U.S. VIRGIN ISLANDS OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1993 1994 Rgure 2.—Ground-water levels at selected wells in Puerto Rico and the U.S. Virgin Islands. o WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1994 Water Quality In water year 1994, the U.S. Geological Survey, in cooperation with local government agencies, collected water- quality data at 80 surface-water station in Puerto Rico. The water-quality data collected at these stations included the major chemical constituents and several additional constituents that are listed in table 3. The highest concentration of each of these constituents detected during water year 1994 and the stations where it was detected are summarized in table 3. Table 3. Surface-water quality stations in Puerto Rico with highest concentration of selected constituents during water year 1994 [All constituent concentrations are in milligrams per liter; MBAS, Hethylene blue active substance] Station number Station name Constituent Concentration 50124700 50106500 50057025 50055250 50011000 50124700 50047990 50106500 Rio Guayanilla at Central Rufina Rio Coamo near Coamo Rio Gurabo near Gurabo Rio Caguitas at Hwy 30 at Caguas Canal Diversi6n at Lago Guajataca Rio Guayanilla at Central Rufina Rio Guaynabo near Bayam6n Rio Coamo near Coamo Sulfide Boron Manganese Iron Zinc Cyanide Phenols MBAS 3, 2, 0. 6. 0. 0. 0. 0. .5 .9 .68 .8 ,17 ,02 ,007 ,18 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 1994. The highest concentrations observed during this year were in stations in the San Juan metropolitan area, which has the highest population concentration in Puerto Rico. In addition to the effluent from the San Juan metropolitan area, the streams are also receiving effluents from the upper basin sewage treatment plants. The main sources of contamination in surface-water systems in Puerto Rico are discharges of liquid waste from industrial and municipal sources. The highest concentrations of fecal coliform and fecal streptococcal bacteria in surface waters in Puerto Rico generally occurred in streams draining from densely populated and industrialized areas of the island. Suspended sediment concentrations were monitored at 23 stations in Puerto Rico during the 1994 water year as part of the cooperative program between the U.S. Geological Survey and various Commonwealth and Federal agencies. High suspended sediment concentrations are a common problem in many streams in Puerto Rico. Most of the streams with high suspended sediment concentration were related to land use, especially construction of urbanizations and roads, agriculture and activities where soil movement was involved. The high suspended sediment concentrations affects the water quality for drinking water and decrease the storage capacities of reservoirs used for water supply. 9 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1994 SPECIAL NETWORKS AND PROGRAMS Hydrologic Bench-Mark Network is a network of 57 sites 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. 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. The National Trends Network (NTN) is a 150-station 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). The National Water-Quality Assessment (NAWQA) Prgram of the U.S. Geological Survey is a long-term program with goals to describe the status and trends of water-quality conditions for a large, dirverse, and geographically distributed part of the Nation's ground- and surface-water resources, and to identify, describe, and explain the major natural and human factors that affect these observed conditions and trends. Assessment activities have begun in more than one-third of the study units and ultimately will be conducted in 60 study units (major watersheds and aquifer systems) that represent a wide range of environmental settings nationwide and that account for a large percentage of the Nation's water use. A wide array of chemical constituents will be measured in ground water, surface water, streambed sediments, and fish tissues. The coordinated application of comparative hydrologic studies at a wide range of spatial and temporal scales will provide information for decision making by water- resources managers and a foundation for aggregation and comparison of findings to address water-quality issues of regional and national interest. Radiochemical Programs is a network of regularly sampled water-quality stations where samples .are collected to be analyzed for radioisotopes. The streams that are sampled represent major drainage basins in the conterminous United States. 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 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 precipitation stations. The purpose of the precipitation stations is to provide an estimate sufficient for hydrologic studies of the tritium input to the United States. EXPLANATION OF RECORDS The surface- and ground-water records published in this report are for the 1994 water year that began October 1, 1993 and ended September 30, 1994. 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 11. 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. 10 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1994 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 downstream 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. 12). 6530' ATLANTIC EXPLANATION FECAL COLIFORM • < 1000 • 1000-10,000 • 10,000-100,000 • 100,000-1,000,000 Figure 3.--Location of fecal coliform bacteria concentration at sampled sites. FECAL STREPTOCOCCI < 1000 1000-10,000 10,000-100,000 100,000-1,000,000 .Figure 4.--Location of fecal streptococci bacteria concentration at sampled sites. 18-30' 45' 30' 15 45' •I^J i S 0284A^2775° A°\ '^'° /\ A0460 J< ^P^TlTY / . ^v 1478 ) \ } ( T \ I ^ —-''i /-Vlf/^ -.^T-^> \ A^4I8_ / /T"^ I ) \ \ I ^8320 A045010 / TN Ao48770r—/ ? ? k> x"x. \ 'OH8 /" k \o3so N AS m?^. ( \ ^ A05.9050 X--A : X ;>rx'x-^ t\r° ^S^A r^^2r ;^ fVl^/^4lf"lo""( !" ° C^-^v ( ^t^\ 0146^( f (l^ Vf^\ ^0^'^^^^^^"^ 1 ^iggo^Ai J / t "/25780 \ L '] \ \A I |l 1S950 • ' ^ ^l-'V A M9990 .^ I ^ ^ 30 KILOMETERS JL ! ; 10 20 MLES V > I R'Q titit.ttfW!?$ J /rr-^.^,.^;^ EXPLANATION ^>tf p^# ^^ A 0920 CONTINOUS STREAMFLOW " ^^ m STATION AND NUMBER • 1415 LAKE-ELEVATION STATION Figure 5.--Location of surface-water stations in Puerto Rico. ATLANTIC OCEAN r 1T1 Y ' SE/I EXPLANATION QUALITY OF WATER STATIONS ^0430 BIOLOGICAL 0820 CHEMICAL o2so SEDIMENT (Daily) o9io SEDIMENT (Bi-monthly) Figure 6.--Location of water-quality stations in Puerto Rico. 67"15 ! 67W 45' 30' 15' 66W 45' 65'30 ! 18*30' h Rio Culebrin. ••^1485 15' 18'00' 10 20 KILOMETERS 10 20 MILES EXPLANATION A LOW-FLOW PARTIAL-RECORD STATION 043850 STATION IDENTIFICATION NUMBER ! ______i____________. .......I... Figure 7.--Location of low-flow partial-record stations in northcentral Puerto Rico. 01 ATLANTIC OCEAN nn -r*., ~ CR-TW-6 * CR-TW-4 /CIVTW-2B , CR-TW-9A ~-- :CR-TW-2G . <. / \ ' \ J " <->,»> :\-V ) /-•" ^-v_ * /" .5 l<:V«-r* . *- * J " ""V^ <?•-•? -•";?" (<"' ^,:'^ f-- -^ NJV 1#"-- ^- f)» v "^ ^ ^tfSyS EXPLANATION 6 WELL AND WELL NUMBER Figure 8.--Location of ground-water stations in Puerto Rico. 65 !!05" j---—-—f--------•—•—•--••—•— ?8'24 ! L I ST. THOMAS I 65 00 17 18'20 : V^/^ »^ 01234 KILOMETERS i...... . . - 01 234 64 "50 64'40' !8'22' 18*18 64°50' 46' j ST. CROIX 17*45' »— I Fredariksted 17^40' - } ^. ^ EXPLANATION -~~\S~ 0 1 2 3 4 KILOMETERS ^3490 SURFACE-WATER STATION AND NUMBER Figure 9.--Location of surface-water stations in the U.S. Virgin Islands. 65"05" 18 65"00' 64'50' 18"24' 18'20' 01234 KILOMETERS rLT l : ' I 01234 MILES 45' 64"40' 18 18: - ST. JOHN '*-^> C4 0 1234 KILOMETERS ^ 0 1 2 3,4 MILES EXPLANATION WELL AND WELL NUMBER 64 =50' 45' 40' 64"35" 17 : 45' ST. CROIX Frederiksted / ^4 L / / 2 V -/ / / \ ^-'— '^* / —_—^>~ L 01234 KILOMETERS 01234 MILES Figure 10.--Location of ground-water stations in the U.S. Virgin Islands. Isla de EXPLANATION 2320 SURFACE-WATER STATION AND NUMBER .„_!._-___-. Figure 11.--Location of surface-water stations in Vieques Island. 20 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1993 66°53' 52' 51' 50' 49' 48' 66°47' IflOrto' or I8°00' I7°59' 134 132^ 131* \ V.'6 jr •27 •74 C</c COORDINATES FOR WELLS 27 (180160066474900) AND 74 (180136066471000) COORDINATES FOR WELLS 132 (180133066603300) AND 134 (180120066603200) COORDINATES FOR WELL 131 (180068066602700) COORDINATES FOR WELL 16 (176922066406800) Figure 12.--Grid showing system for numbering wells and miscellaneous sites (latitude and longitude). Records of Stage and Water Discharge Records of stage and water discharge may be complete or partial. Complete records of discharge are those obtained using a continuous stage-recording device through which either instantaneous or mean daily discharges may be computed for any time, or any period of time, during the period of record. Complete records of lake or reservoir content, similarly, are those for which stage or content may be computed or estimated with reasonable accuracy for any time, or period of time. They may be obtained using a continuous stage-recording device, but need not be. Because daily mean discharges and end-of-day contents commonly are published for such stations, they are referred to as "daily stations." By contrast, partial records are obtained through discrete measurements without using a continuous stage-recording device and pertain only to a few flow characteristics, or perhaps only one. The nature of the partial record is indicated by table titles such as "Low-flow partial records." Records of miscellaneous discharge measurements or of measurements from special studies, such as low-flow seepage studies, may be considered as partial records, but they are presented separately in this type of report. Location of all complete-record stations for which data are given in this report are shown in figures 5 and 8. Data Collection and Computation The data obtained at a complete-record gaging station on a stream or canal consists of a continuous record of stage, individual measurements of discharge throughout a range of stages, and notations regarding factors that may affect the relationships between stage and discharge. These data, together with supplemental information, such as weather records, are used to compute daily discharges. The data obtained at a complete-record gaging station on a lake or reservoir consist of a record of stage and of notations regarding factors that may affect the relationship between stage and lake content These data are used with stage-area and stage-capacity curves or tables to compute water-surface areas and lake storage. Continuous records of stage are obtained with analog recorders that trace continuous graphs of stage or with digital recorders that punch stage values on paper tapes at selected time intervals or electronic satellite data collector platforms that receive stage values at selected time intervals. Measurements of discharge are made with current meters using methods adapted by the Geological Survey as a result of experience accumulated since 1880. These methods are described in standard textbooks, in Water-Supply Paper 2175, and in U.S. Geological Survey Techniques of Water- Resources Investigations, Book 3, Chapter A6. 21 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1994 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 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. 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 Steamflow data in this report are presented in a new format that is considerably different from the format in data reports prior to the 1992 water year. The major changes are that statistical characteristics of discharge now appear in tabular summaries following the water-year data table and less information is provided in the text or station manuscript above the table. These changes represent the results of a pilot program to reformat the annual water-data report to meet current user needs and data preferences. The records published for each continuous-record surface-water discharge station (gaging station) now consist of four parts, the manuscript or station description; the data table of daily mean values of discharge for the current water year with summary data; a tabular statistical summary of monthly mean flow data for a designated period, by water year; and a summary statistics table that includes statistical data of annual, daily, and instantaneous flows as well as data pertaining to annual runoff, 7-day low-flow minimum, and flow duration. Station manuscript The manuscript provides, under various headings, descriptive information, such as station location; period of record; historical extremes outside the period of record; 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 stations descriptions. 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. 22 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1994 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.—Because of new information, published records 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. 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. 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. 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. Data table of daily mean value The daily table of discharge records for stream-gaging stations gives mean discharge for each day of the water year. In the monthly summary for the table, the line headed "TOTAL" gives the sum of the daily figures for each month; the line headed "MEAN" gives the average flow in cubic feet per second for the month; and the lines headed "MAX" and "MIN" give the maximum and minimum daily mean discharges, respectively, for each 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 or in acre- feet may be omitted if there is extensive regulations or diversion or if the drainage area includes large noncontributing areas. 23 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1994 Statistics of monthly mean data A tabular summary of the mean (line headed "MEAN"), maximum (line headed "MAX"), and minimum (line headed "MIN") of monthly mean flows for each month for a designated period is provided below the mean values table. The water years of the first occurrence of the maximum and minimum monthly flow are provided immediately below those figures. The designated period will be expressed as "FOR WATER YEARS __- BY WATER YEAR (WY)," and will list the first and last water years of the range of years selected from the PERIOD OF RECORD paragraph in the station manuscript. It will consist of all of the station records within the specified water years, including complete months of record for partial water years, if any, and may coincide with the period of record for the station. The water years for which the statistics are computed will be consecutive, unless a break in the station record is indicated in the manuscript. Summary statistics A table titled "SUMMARY STATISTICS" follows the statistics of monthly mean data tabulation. This table consists of four columns, with the first column containing the line headings of the statistics being reported. The table provides a statistical summary of yearly, daily, and instantaneous flows, not only for the current water year but also for the previous calendar year and for a designated period, as appropriate. The designated period selected, "WATER YEARS __-___," will consist of all of the station records within the specified water years, inclusive, including complete months of record for partial water years, if any, and may coincide with the period of record for the station. The water years for which the statistics are computed will be consecutive, unless a break in the station record is indicated in the manuscript. All of the calculations for the statistical characteristics designated ANNUAL (see line headings below.), except for the "ANNUAL 7-DAY MINIMUM" statistic, are calculated for the designated period using complete water years. The other statistical characteristics may be calculated using partial water years. The date or water year, as appropriate, of the first occurrence of each statistic reporting extreme values of discharge is provided adjacent to the statistic. Repeated occurrences may be noted in the REMARKS paragraph of the manuscript or in footnotes. Because the designated period may not be the same as the station period of record published in the manuscript, occasionally the dates of occurrence listed for the daily and instantaneous extremes in the designated- period column may not be within the selected water years listed in the heading. When this occurs, it will be noted in the REMARKS paragraph or in footnotes. Selected streamflow duration curve statistics and runoff data are also given. Runoff data may be omitted if there is extensive regulation or diversion of flow in the drainage basin. The following summary statistics data, as appropriate, are provided with each continuous record of discharge. Comments to follow clarify information presented under the various line headings of the summary statistics table. ANNUAL TOTAL.~The sum of the daily mean values of discharge for the year. At some stations the annual total discharge is adjusted for reservoir storage or diversion. The adjusted figures are identified by a symbol and corresponding footnotes. ANNUAL MEAN.~The arithmetic mean of the individual daily mean discharges for the year noted or for the designated period. At some stations the yearly mean discharge is adjusted for reservoir storage or diversion. The adjusted figures are identified by a symbol and corresponding footnotes. HIGHEST ANNUAL MEAN.—The maximum annual mean discharge occurring for the designated period. LOWEST ANNUAL MEAN.~The minimum annual mean discharge occurring for the designated period. HIGHEST DAILY MEAN.~The maximum daily mean discharge for the year or for the designated period. LOWEST DAILY MEAN.--The minimum daily mean discharge for the year or for the designated period. ANNUAL 7-DAY MINIMUM.-The lowest mean discharge for 7 consecutive days for a calendar year or a water year. Note that most low-flow frequency analyses of annual 7-day minimum flows use a climatic year (April 1 - March 31). The date shown in the summary statistics table is the initial date of the 7-day period. (This value should not be confused with the 7-day 10-year low-flow statistics). 24 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1994 INSTANTANEOUS PEAK FLOW.—The maximum instantaneous discharge occurring for the water year or for the designated period. Note that secondary instantaneous peak discharges above a selected base discharge are stored in District computer files for stations meeting certain criteria. Those discharge values may be obtained by writing to the District Office. (See address on back of the title page of this report.) INSTANTANEOUS PEAK STAGE.-The maximum instantaneous stage occurring for the water year or for the designated period. If the dates of occurrence for the instantaneous peak flow and instantaneous peak stage differ, the REMARKS paragraph in the manuscript or a footnote may be used to provide further information. INSTANTANEOUS LOW FLOW.—The minimum instantaneous discharge occurring for the water year or for the designated period. ANNUAL RUNOFF.-Indicates the total quantity of water in runoff for a drainage area for the year. Data reports may use any of the following units of measurements in presenting annual runoff data: Acre-foot (AC-FT) is the quantity of water required to cover 1 acre to a depth of 1 foot and is equivalent to 43,560 cubic feet or about 326,000 gallons or 1,233 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 the runoff is distributed uniformly in time and area. Inches (INCHES) indicates the depth to which the drainage area would be covered if all of the runoff for a given time period were uniformly distributed on it. 10 PERCENT EXCEEDS.-The discharge that is exceeded 10 percent of the time for the designated period. 50 PERCENT EXCEEDS.-The discharge that is exceeded 50 percent of the time for the designated period. 90 PERCENT EXCEEDS.-The discharge that is exceeded 90 percent of the time for the designated period. Data collected at partial-record stations follow the information for continuous-record sites. Data for partial-record discharge stations are presented in a table of discharge measurements at low-flow partial-record stations. These measurements are generally made in times of drought to give better areal coverage to those events. Those measurements and others collected for some special reason are called measurements at miscellaneous sites. 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 ftVs. 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. 25 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1994 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. 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. 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. 26 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1994 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. Sediment Suspended-sediment concentrations are determined from samples collected by using depth-integrating and pumping sediment samplers. Samples usually are obtained at several verticals in the cross section, or a single sample may be obtained at a fixed point and a coefficient applied to determine the mean concentration in the cross sections. During periods of rapidly changing flow or rapidly changing concentration, samples may have been collected more frequently (twice daily or 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, suspended-sediment loads for other periods of similar discharge, and computed by the subdivided-day method using the transport curves. 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 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. 27 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1994 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, 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. 28 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1994 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. Water-level records are obtained from direct measurements with a steel tape or from the graph or punched tape of a water-stage recorder. The water-level measurements in this report are given in feet with reference to land-surface datum (Isd). Land-surface datum is a datum plane that is approximately at land surface at each well. If known, the elevation of the land-surface datum is given in the well description. The height of the measuring point (MP) above or below land-surface datum is given in each well description. Water levels in wells equipped with recording gages are reported for every day and as an instantaneous observation at noon. Water levels are reported to as many significant figures as can be justified by the local conditions. For example, in a measurement of a depth to water of several hundred feet, the error of determining the absolute value of the total depth to water may be a few tenths of a foot, whereas the error in determining the net change of water level between successive measurements may be only a hundredth of a few hundredths of a foot. For lesser depths to water, the accuracy is greater. Accordingly, most measurements reported to a hundredth of a foot, but some are given to a tenth of a foot or a larger unit. 29 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1994 Data Presentation Each well record consists of three parts, the station description, the data table of water levels observed during the water year and a graph of the water levels for the current water year and other selected period. 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 of the well description. 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. INSTRUMENTATION.—This paragraph provides information on both the frequency of measurment and the collection method used, allowing the user to better evaluate the reported water-level extremes by knowing whether they are based on weekly, monthly, or some other frequency of measurement. 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 (or below) sea level; it is reported with a precision depending on the method of determination. 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 and their dates of occurrence 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. A hydrograph for a selected period of record follows each water-level table. 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. 30 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1994 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. 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 U.S. Geological Survey is the principal Federal water-data agency and, as such, collects and disseminates about 70 percent of the water data currently being used by numerous State, local, private, and other Federal agencies to develop and manage our water resources. As part of the U.S. Geological Survey's program of releasing water data to the public, a large-scale computerized system has been developed for the storage and retrieval of water data collected through its activities. The National Water-Data Storage and Retrieval System (WATSTORE) was established in 1972 to provide an effective and efficient means for the processing and maintenance of water data collected through the activities of the U.S. Geological Survey and to facilitate release of the data to the public. A variety of useful products, ranging from data tables to complex statistical analyses such as Log Pearson Type III, can be produced using WATSTORE. The system resides on the central computer facilities of the U.S. Geological Survey at its National Center in Reston, Virginia, and consists of related files and data bases. * Station Header File - Contains descriptive information on over 440,000 sites throughout the United States and its territories where the U.S. Geological Survey collects or has collected data. * Daily Values Files - Contains over 220 million daily values of streamflow, stages, reservoir contents, water temperatures, specific conductances, sediment concentrations, sediment discharges, and ground-water level. * Peak Flow File - Contains approximately 500,000 maximum (peak) streamflow and gage-height values at surface-water sites. * Water-Quality Data - Contains approximately 2 million analyses of water samples that describe the chemical, physical, biological, and radio-chemicals characteristics of both surface and ground water. * Ground-Water Site Inventory Data Base - Contains inventory data for over 900,000 wells, springs, and other sources of ground water. The data includes site location, geohydrologic characteristics, well-construction history, and one-time field measurements such as water temperature. 31 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1994 In 1976, the U.S. Geological Survey opened WATSTORE to the public for direct access. The signing of a Memorandum of Agreement with the Survey is required to obtain direct access to WATSTORE. The system can be accessed either synchronously or asynchronously. The requestor will be expected to pay all computer costs he/she incurs. Direct access may be obtained by contacting: U.S. Geological Survey National Water Data Exchange 421 USGS National Center Reston, Virginia 22092 In addition to providing direct access to WATSTORE, data can be provided in various machine-readable formats on magnetic tape or 5-1/4 inch floppy disk; and, as noted in the introduction, on CD-ROM discs. Beginning with the 1990 water year, all water-data reports will also be available on Compact Disc-Read Only Memory (CD-ROM). All data report published for the current water year for the entire Nation, including Puerto Rico and the Trust Territories, will be reproduced on a single CD-ROM disc. Information about the availability of specific types of data or products, and user charges, can be obtained locally from each of the Water Resources Division's offices. (See address on the back of the title page). A limited number of CD-ROM discs will be available for sale by the Books and Open-File Reports Section, U.S. Geological Survey, Federal Center, Box 25425, Denver, Colorado 80225. 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. 32 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1994 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 periphyton 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. 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. Chlorophyll 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. 33 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1994 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. Cubic foot per second (ftVs) 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 (fWs/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. 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. Annual 7-day minimum is the lowest mean discharge for 7 consecutive days for a calendar year or a water year. Note that most low-flow frequency analyses of annual 7-day minimum flows use a climatic year (April 1 - March 31). The date shown in the summary statistics table is the initial date of the 7-day period. (This value should not be confused with the 7-day 10-year low-flow statistic.) 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: __ s d = - 1, nj_ Iog2 nj_ n n Where ni 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. 34 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1994 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. 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 (Isd) is a datum plane that is approximately at land surface at each ground-water observation well. Measuring point (MP) is an arbitrary permanent reference point from which the distance to the water surface in a well is measured to obtain the water level. Metamorphic stage refers to the stage of development that an organism exhibits during its transformation from an immature form to an adult form. This developmental process exists for most insects, and the degree of difference from the immature stage to the adult form varies from relatively slight to pronounced, with many intermediates. Examples of metamorphic stages of insects are egg-larva-adult or egg-nymph-adult. Methylene blue active substances (MBAS) are apparent detergents. The determination depends on the formation of a blue color when methylene blue dye reacts with synthetic anionic detergent compounds. Micrograms per gram (ug/g) is a unit expressing the concentration of a chemical element as the mass (micrograms) of the element per unit mass (gram) of material analyzed. 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 4. WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1994 Table 4. Factors for conversion of chemical constituents in milligrams per liter to milliequivalents per liter. Ion Aluminum { Al+3 )*........ Ammonia as NH4+1 ........ Barium (Ba+2 )........... Bicarbonate (HCO3-1) . . . . Bromide (Br-1) .......... Calcium (Ca+2 ).......... Carbonate (CO3-2 )....... Chloride (Cl-1) ......... Chromium (Cr+6) *........ Cobalt (Co+2)*. ......... Copper (Cu+2 )*.......... Cyanide (CN-1) .......... Fluoride (F-l) .......... Hydrogen (H+l) .......... Hydroxide (OH-1) ........ Multiply by 0.11119 .05544 .01456 .01639 .01251 .04990 .03333 .02821 .11539 .03394 .03148 .03844 .05264 .99209 .05880 Ion Iodide (1-1) ......... Iron (Fe+3) .......... Lead (Pb+2) .......... Lithium (Li+1) ....... Magnesium (Mg+2) ..... Manganese (Mn+2 )*.... Nickel (Ni+2) ........ Nitrate (N03-1) ...... Nitrite (NO2-1) ...... Phosphate (PO4-3).... Potassium (K+l) ...... Sodium (NA+1) ........ Strontium (Sr+2) ..... Sulfate (S04-2) ...... Zinc (Zn+2)*. ........ Multiply by 0.00788 .05372 .00965 .14411 .08226 .03640 .03406 .01613 .02174 .03159 .02557 .04350 .02283 .02082 .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. 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. 36 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1994 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. 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 (IX 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. 37 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1994 Primary productivity is a measure of the rate at which new organic matter is formed and accumulated through photosynthetic and chemosynthetic activity of producer organisms (chiefly, green plants). The rate of primary production is estimated by measuring the amount of oxygen released (oxygen method) or the amount of carbon assimilated by the plants (carbon method). Milligrams of carbon per area or volume per unit time [mg C/(m2.time)1 for periphyton and macrophytes and [mg 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 [mgO / (m2.time)l for periphyton and macrophytes and [mgO /(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. 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. 38 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1994 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 (ftVs) 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). 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. 39 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1994 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. 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 paniculate matter is not achieved by the digestion treatment and thus the determination represents something less than the "total" amount (that is, less than 95 percent) of the constituent present in the sample. To achieve comparability of analytical data, equivalent digestion procedures are required of all laboratories performing such analyses because different digestion procedures are likely to produce different analytical results. Determinations of "suspended, recoverable" constituents are made either by analyzing portions of the material collected on the filter or, more commonly, by difference, based on determinations of (1) dissolved and (2) total recoverable concentrations of the constituent. Suspended, total is the total amount of a given constituent in the part of representative water-suspended sediment sample that is retained on a 0.45 um membrane filter. This term is used only when the analytical procedure assures measurement of at least 95 percent of the constituent determined. A knowledge of the expected form of the constituent in the sample, as well as the analytical methodology used, is required to determine when the results should be reported as "suspended, total." Determinations of "suspended, total" constituents are made either by analyzing portions of the material collected on the filter or, more commonly, by difference, based on determinations of (1) dissolved and (2) total concentrations of the constituent. Taxonomy is the division of biology concerned with the classification and naming of organisms. The classification of organisms is based upon a hierarchial scheme beginning with Kingdom and ending with Species at the base. The higher the classification level, the fewer features the organisms have in common. For example, the taxonomy of a particular mayfly, Hexagenia limbata, is the following: Phylum........................ Arthopoda Class........... ................Insecta Order...........................Ephemeroptera 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. 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. 40 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1994 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 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. 41 PUBLICATIONS ON TECHNIQUES OF WATER-RESOURCES INVESTIGATIONS The U.S. Geological Survey publishes a series of manuals describing procedures for planning and con- ducting 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, Branch of Information Services, Box 25286, Federal Center, 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. Cur- rent 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 D1.1975. 65 pages. 1-D2. Guidelines for collection and field analysis of ground-water samples for selected unstable constituents, by W. W. Wood: USGS--TWRI Book 1, Chapter D2.1976. 24 pages. 2-D1. Application of surface geophysics to ground-water investigations, by A. A. R. Zohdy, G. P. Eaton, and D. R. Mabey: USGS--TWRI Book 2, Chapter D1.1974.116 pages. 2-D2. Application of seismic-refraction techniques to hydrologic studies, by F. P. Haeni: USGS--TWRI Book 2, Chapter D2.1988. 86 pages. 2-E1. Application of borehole geophysics to water-resources investigations, by W. S. Keys and L.M. MacCary: USGS--TWRI Book 2, Chapter E1.1971.126 pages. 2-E2. Borehole geophysics applied to ground-water investigations, by W. S. Keys: USGS--TWRI Book 2, Chapter E2.1990.150 pages. 2-F1. Application of drilling, coring, and sampling techniques to test holes and wells, by Eugene Shuter and W. E. Teasdale: USGS-TWRI Book 2, Chapter F1.1989. 97 pages. 3-A1. General field and office procedures for indirect discharge measurements, by M. A. Benson and Tate Dalrymple: USGS--TWRI Book 3, Chapter A1.1967. 30 pages. 3-A2. Measurement of peak discharge by the slope-area method, by Tate Dalrymple and M. A. Benson: USGS--TWRI Book 3, Chapter A2.1967.12 pages. 3-A3. Measurement of peak discharge at culverts by indirect methods, by G. L. Bodhaine: USGS--TWRI Book 3, Chapter A3.1968. 60 pages. 3-A4. Measurement of peak discharge at width contractions by indirect methods, by H. F. Matthai: USGS-TWRI Book 3, Chapter A4.1967. 44 pages. 3-A5. Measurement of peak discharge at dams by indirect methods, by Harry Hulsing: USGS--TWRI Book 3. Chapter A5.1967. 29 pages. 3-A6. General procedure for gaging streams, by R. W. Carter and Jacob Davidian: USGS--TWRI Book 3, Chapter A6.1968.13 pages. 3-A7. Stage measurement 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. 4 2 PUBLICATIONS ON TECHNIQUES OF WATER-RESOURCES INVESTIGATIONS-Continued 3-A9. Measurement of time of travel in streams by dye tracing, by F. A. Kilpatrick and J. F. Wilson, Jr.: USGS--TWRI Book 3, Chapter A9.1989. 27 pages. 3-AIO. Discharge ratings at gaging stations, by E. J. Kennedy: USGS--TWRI Book 3, Chapter A10.1984. 59 pages. 3-A11. Measurement of discharge by the moving-boat method, by G. F. Smoot and C. E. Novak: USGS-- TWRI Book 3, Chapter A11.1969. 22 pages. 3-A12. Fluorometric procedures for dye tracing, Revised, by J. F. Wilson, Jr., E. D. Cobb, and F. A. Kilpatrick: USGS- -TWRI Books, Chapter A12.1986. 34pages. 3-A13. Computation of continuous records of streamflow, by E. J. Kennedy: USGS--TWRI Book 3, Chapter A13.1983.53 pages. 3-A14. Use of flumes in measuring discharge, by F. A. Kilpatrick and V. R. Schneider: USGS--TWRI Book 3, Chapter A14.1983.46 pages. 3-A15. Computation of water-surface profiles in open channels, by Jacob Davidian: USGS--TWRI Book 3, Chapter A15.1984.48 pages. 3-A16. Measurement of discharge using tracers, by F. A. Kilpatrick and E. D. Cobb: USGS--TWRI Book 3, Chapter A16.1985. 52 pages. 3-A17. Acoustic velocity meter systems, by Antonius Laenen: USGS--TWRI Book 3, Chapter A17. 1985. 38 pages. 3-A18. Determination of stream reaeration coefficients by use of tracers, by F. A. Kilpatrick, R. E. Rathbun, Nobuhiro Yotsukura, G. W. Parker, and L. L. DeLong: USGS-TWRI Book 3, Chapter A18.1989.52 pages. 3-A19. Levels at streamflow gaging stations, by E.J. Kennedy: USGS--TWRI Book 3, Chapter A19.1990. 31 pages. 3-A20. Simulation ofsoluable waste transport and buildup in surface waters using tracers, by F. A. Kilpatrick: USGS--TWRI Book 3, Chapter A20.1993. 38 pages. 3-B1. Aquifer-test design, observation, and data analysis, by R. W. Stallman: USGS--TWRI Book 3, Chapter B1.1971. 26 pages. 3-B2. Introduction to ground-water hydraulics, a programed text for self-instruction, by G. D. Bennett: USGS- TWRI Book 3, Chapter B2.1976.172 pages. 3-B3. Type curves for selected problems of flow to wells in confined aquifers, by J. E. Reed: USGS- TWRI Book 3, Chapter B3.1980.106 pages. 3-B4. Regression modeling of ground-water flow, by R. L. Cooley and R. L. Naff: USGS-TWRI Book 3, Chapter B4.1990.232 pages. 3-B4. Supplement 1. Regression modeling of ground-water flow - Modifications to the computer code for nonlinear regression solution of steady-state ground-water flow problems, by R. L. Cooley: USGS- -TWRI Book 3, Chapter B4.1993. 8 pages. 3-B5. Definition of boundary and initial conditions in the analysis of saturated ground-water flow systems--An introduction, by O. 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, O. L. Franke, and G. D. Bennett: USGS-TWRI Book 3, Chapter B6.1987. 28 pages. 3-B7. Analytical solutions for one-, two-, and three-dimensional solute transport in ground-water systems with uniform flow, by E. J. Wexler: USGS--TWRI Book 3, Chapter B7.1992.190 pages. 3-C1. Fluvial sediment concepts, by H. P. Guy: USGS-TWRI Book 3, Chapter C1.1970. 55 pages. PUBLICATIONS ON TECHNIQUES OF WATER-RESOURCES INVESTIGATIONS-Continued * 3 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-A1. Some statistical tools in hydrology, by H. C. Riggs: USGS--TWRI Book 4, Chapter A1.1968. 39 pages. 4-A2. Frequency curves, by H. C. Riggs: USGS--TWRI Book 4, Chapter A2.19£8.15 pages. 4-B1. Low-flow investigations, by H. C. Riggs: USGS-TWRI Book 4, Chapter B1.1972.18 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 D1.1970.17 pages. 5-A1. Methods for determination of inorganic substances in water and fluvial sediments, by MJ. Fishman and L C. Friedman, editors: USGS-TWRI Book 5, Chapter A1.1989. 545 pages. 5-A2. Determinatbn 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 the determination of organic substances in water and fluvial sediments, edited by R. L. Wershaw, M. J. Fishman, R. R. Grabbe, and L. E. Lowe: USGS-TWRI Book 5, Chapter A3. 1987.80 pages. 5-A4. Methods for collection and analysis of aquatic biological and microbiological samples, by L. J. Britton and P. E. Greeson, editors: USGS-TWRI Book 5, Chapter A4. 1989. 363 pages. 5-A5. Methods for determination of radioactive substances in water and fluvial sediments, by L.L. Thatcher, V. J. Janzer, and K. W. Edwards: USGS-TWRI Book 5, Chapter A5.1977. 95 pages. 5-A6. Quality assurance practices for the chemical and biological analyses of water and fluvial sediments, by L. C. Friedman and D. E. Erdmann: USGS-TWRI Book 5, Chapter A6.1982. 181 pages. 5-C1. Laboratory theory and methods for sediment analysis, by H. P. Guy: USGS--TWRI Book 5, Chapter C1.1969.58 pages. 6-A1. A modular three-dimensional finite-difference ground-water flow model, by M. G. McDonald and A. W. Harbaugh: USGS-TWRI Book 6, Chapter A1.1988. 586 pages. 6-A2. Documentation of a computer program to simulate aquifer-system compaction using the modular finite-difference ground-water flow model, by S. A. Leake and D. E. Prudic: USGS-TWRI Book 6, Chapter A2.1991.68 pages. 6-A3. A modular finite-element model (MODFE) for areal and axisymmetric ground-water-flow problems, Part 1: Model Description and User's Manual, by L. J. Torak: USGS-TWRI Book 6, Chapter A3.1993. 136 pages 6-A4. A modular finite-element model (MODFE) for areal and axisymmetric ground-water-flow problems, Part 2: Derivation of finite-element equations and comparisons with analytical solutions, by R. L. Cooley: USGS-TWRI Book 6, Chapter A4. 1992. 108 pages. 6-A5. A modular finite-element model (MODFE) for areal and axisymmetric ground-water-flow problems, Part3: Design philosophy and programming details, by L. J. Torak: USGS-TWRI Book 6, Chapter A5,1993. 243 pages. 4 4 PUBLICATIONS ON TECHNIQUES OF WATER-RESOURCES INVESTIGATIONS-Continued 7-C1. 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 C1. 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. Schaff ranek, R. A. Baltzer, and D. E. Goldberg: USGS--TWRI Book 7, Chapter C3.1981.110 pages. 8-A1. Methods of measuring water levels in deep wells, by M. S. Garber and F. C. Koopman: USGS-- TWRI Book 8, Chapter A1.1968. 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. 45 Surface and Quality-of-Water Records for Puerto Rico 46 THIS PAGE WAS LEFT BLANK INTENTIONALLY 47 ATLANTIC OCEAN --w. ?$-*—£ ^~*S AGUAD(LL4 Toios V0io72o EXPLANATION SURFACE-WATER STATION AND NUMBER QUALITY-OF- WATER STATION AND NUMBER QUALITY-OF- WATER PARTIAL RECORD STATION AND NUMBER WELL AND WELL NUMBER -Map ar«c 01 23456 KILOMETERS : i ! 1 ! : ! 0 1 4 MILES Figure 13.--Rio Guajataca basin. 48 RIO GUAJATACA BASIN 50010500 RIO GUAJATACA AT LARES, PR LOCATION.--Lat 18°18'01", long 66°52'24", Hydrologic Unit 21010001 at bridge on Highway 111, 0.1 mi (0.2 km) upstream from Quebrada Anon, and 0.4 mi (0.6 km) east of Lares. DRAINAGE AREA.--3.16 mi 1 (8.18 km'). WATER-DISCHARGE RECORDS PERIOD OF RECORD.—February 1959 to February 1962 (annual low-flow measurements only), January 1963 to April 1969 (monthly measurements only), Hay 1969 to December 1970 (February to May 1971 and March 1974 to November 1989, monthly measurements only), December 1989 to current year. GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 935 ft (285 m), from topographic map. REMARKS.--Records poor. Gage-height and precipitation satellite telemetry at station. Small diversion above station for sewage treatment plant; effluent re-enters stream below station. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY NOV DEC JAN FEE MAR APR JUN JUL SEP 1 1.1 3.7 2 25 3.8 3 5.1 3.6 4 22 3.4 5 21 12 6 18 6.1 7 9.6 3.5 8 8.9 5.8 9 16 4.1 10 22 3.5 11 9.1 3.1 12 6.8 2.9 13 4.8 3.1 14 4.2 4.7 15 3.9 9.0 16 9.4 8.1 17 25 4.2 18 5.4 3.6 19 .9 3.0 20 .8 2.9 21 .7 2.8 22 .5 2.8 23 .4 2.4 24 .3 2.7 25 .7 2.6 26 19 2.5 27 18 2.6 28 6.4 2.6 29 4.9 10 30 4.1 4.2 31 3.9 TOTAL 305.9 129.3 MEAN 9.87 4.31 MAX 25 12 MIN 1.1 2.4 AC-FT 607 256 CFSM 3.12 1.36 IN. 3.60 1.52 STATISTICS OF MONTHLY MEAN MEAN 17 . 1 9 . 14 MAX 33.7 16.7 (WY) 1991 1971 MIN 9.87 4.31 (WY) 1994 1994 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN-DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE ANNUAL RUNOFF (AC-FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 2.6 2.3 2.3 2.4 10 5.0 2.3 2.3 2.4 2.1 2.1 2.0 8.6 10 3.1 1.8 1.8 2.3 30 12 4.9 3.8 3.2 2.2 2.1 2.2 2.1 2.1 2.0 2.0 2.0 136.0 4.39 30 1.8 270 1.39 1.60 DATA 3.83 7.31 1971 1.35 1991 FOR 1.8 2.0 2.0 1.8 1.6 1.6 1.7 1.6 1.5 1.6 1.7 1.6 1.6 1.6 1.5 1.6 1.5 1.5 1.6 1.5 1.4 9.9 15 4.5 1.7 1.4 1.2 1.2 1.2 1.2 1.3 72.9 2.35 15 1.2 145 .74 .86 1.5 1.1 1.2 1.2 1.1 1.1 1.1 1.2 1.2 .91 1.0 .90 1.1 1.3 .88 .92 .69 .69 .73 .76 .73 .83 .73 1.0 .85 .89 1.2 1.1 ___ ___ --- 27.91 1.00 1.5 .69 55 .32 .33 FOR WATER YEARS 1969 2.51 6.83 1971 .66 1991 2.03 5.37 1971 .93 1992 .81 .67 .65 .64 .79 .99 1.0 .72 .69 .61 .66 1.5 .81 .63 .61 .57 .62 .94 .73 .56 .90 .64 .68 .70 .71 4.4 1.3 .61 1.5 1.1 .86 28.60 .92 4.4 .56 57 .29 .34 - 1994 2.07 6.38 1971 .92 1994 1993 CALENDAR YEAR 1937.57 5.31 48 .76 .81 3840 1.68 22.81 13 2.9 1.1 May 7 Mar 8 Mar 19 .68 .82 .91 .77 .74 1.3 1.2 1.0 1.0 .99 1.0 .79 .70 .89 .80 .83 .89 3.3 1.7 2.6 1.5 .94 .82 .83 .85 .79 .94 1.2 .99 .97 —— 32.74 1.09 3.3 .68 65 .35 .39 , BY WATER 3.84 7.63 1993 1.09 1994 FOR 1994 1508 4 37 1490 14 2990 1 17 10 2 .94 .93 2.2 1.0 .76 2.5 1.2 .91 .89 2.0 25 22 2.7 1.8 5.4 5.4 37 7.5 2.3 1.5 1.3 1.2 1.1 1.5 1.1 1.1 1.3 1.5 1.5 1.1 .97 137.60 4.44 37 .76 273 1.40 1.62 YEAR (WY) 8.96 12.8 1993 3.86 1992 8.4 28 10 3.6 2.0 1.7 1.5 .92 1.5 1.7 1.5 1.1 1.5 17 9.2 12 4.6 2.0 1.6 1.4 1.2 1.4 2.0 2.0 2.1 2.1 1.9 2.7 2.6 2.4 --- 131.62 4.39 28 .92 261 1.39 1.55 6.63 9.73 1970 3.18 1992 WATER YEAR .49 .13 .56 .67 .20 .31 .76 .0 .79 May 17 Mar 20 Mar 14 Sep 29 Sep 29 15 4.5 4.6 2.6 1.3 1.6 5.8 2.3 1.6 1.4 1.6 1.3 1.3 1.2 1.1 1.6 1.1 1.1 .98 .98 .78 .77 .83 .88 .79 .85 .85 1.0 .76 .95 .99 62.41 2.01 15 .76 124 .64 .73 3.91 9.85 1969 2.01 1994 1.2 .73 .85 .93 1.1 11 28 27 14 5.2 2.6 2.0 1.8 1.6 1.8 1.8 2.3 2.2 3.8 14 15 5.6 3.0 8.5 8.3 4.3 19 7.2 3.4 2.5 2.3 203.01 6.55 28 .73 403 2.07 2.39 5.33 9.88 1991 3.34 1970 WATER YEARS 1969 5.79 8.05 4.13 216 .47 .51 5300 21.30 4190 1.83 24.89 14 3.2 .90 Oct Jan Jan Oct Oct 3.9 4.2 2.4 9.9 3.7 2.3 2.1 5.4 6.9 3.2 3.7 20 5.5 3.7 2.7 2.2 2.0 2.0 17 7.5 15 8.9 4.5 19 4.9 3.9 19 6.0 35 14--- 240.5 8.02 35 2.0 477 2.54 2.83 10.3 15.7 1990 5.95 1993 - 1994 1991 1994 7 1990 13 1991 9 1991 7 1990 7 1990 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 from Quebrada Anon, and 0.4 mi (0.6 km) northeast of Lares plaza. DRAINAGE AREA.--3.16 mi 1 (8.18 km 1 ). PERIOD OF RECORD.--Water years 1958-71, 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 49 DATE OCT 1993 20... DEC 16. .. MAR 1994 01. .. APR 19. . . JDN 28. . . ADG 23. . . DATE OCT 1993 20. .. DEC 16. .. MAR 1994 01. . . APR 19. . . JDN 28. . . ADG 23. . . DATE OCT 1993 20. . . DEC 16... MAR 1994 01. . . APR 19. . . JDN 28. . . ADG 23. .. TIME 1205 1030 1030 1130 1310 1320 HARD- NESS TOTAL (MG/L AS CACO3 ) 92 -- -- 86 -- 110 SILICA, DIS- SOLVED (MG/L AS SI02) 32 -- -- 28 -- 27 DIS- CHARGE, INST. CUBIC FEET PER SECOND 4.7 2.2 0.76 1.4 2.2 2.8 CALCIUM DIS- SOLVED (MG/L AS CA) 27 -- -- 24 -- 32 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 157 -- -- 142 -- 171 SPE- CIFIC CON- DUCT- ANCE (US/CM) 247 234 242 * 208 235 267 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 5.9 -- -- 6.3 -- 6.2 SOLIDS, DIS- SOLVED (TONS PER DAY) 1.98 -- -- 0.55 -- 1.28 PH WATER WHOLE FIELD (STAND- ARD DNITS) 7.7 7.5 6.6 7.4 7.8 7.5 SODIUM, DIS- SOLVED (MG/L AS NA) 12 -- -- 11 -- 12 RESIDUE TOTAL AT 105 DBG. C, SDS- PBNDBD (MG/L) 9 10 10 12 3 11 TEMPER- ATURE WATER (DBG C) 23.5 20.5 20.5 23.0 25.0 25.5 SODIUM AD- SORP- TION RATIO 0.5 -- -- 0.5 -- 0.5 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.40 <0.20 0.30 -- <0.20 <0.20 TUR- BID- ITY (NTU) 1.2 7.3 3.0 3.0 1.9 2.2 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 2.8 -- -- 2.4 -- 2.8 PHOS- PHORUS TOTAL (MG/L AS P) 0.060 0.040 0.080 -- 0.070 0.050 OXYGEN, DIS- SOLVED (MG/L) 6.4 4.6 6.8 7.8 8.4 8.0 ALKA- LINITY WAT WH TOT FET FIELD MG/L AS CAC03 97 87 94 78 87 110 ARSENIC TOTAL (UG/L AS AS) 1 -- -- <1 -- -- OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 77 51 77 93 104 100 SULFIDB TOTAL (MG/L AS S) <0.5 -- -- <0.5 -- "" BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 -- -- <100 -- -- OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 31 <10 <10 11 12 <10 SULFATE DIS- SOLVED (MG/L AS SO4) 8.4 -- -- 12 -- 14 BORON, TOTAL RECOV- ERABLE (UG/L AS B) 10 -- -- 20 -- -- COLI- FORM, FECAL, 0.45 UM-MF (COLS./ 100 ML) 54000 4300 2000 2900 3400 4100 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 11 -- -- 12 -- 11 CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- <1 -- -- STREP- TOCOCCI FECAL, (COLS. PER 100 ML) 5300 6600 2300 7400 960 2500 FLUO- RIDB, DIS- SOLVED (MG/L AS F) 0.10 -- -- <0.10 -- 0.10 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) <1 -- -- <1 -- -- K = non-ideal count 50 RIO GOAJATACA BASIN 50010500 RIO GOAJATACA AT LARES, PR—Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE OCT 1993 20... DEC 16. .. MAR 1994 01. . . APR 19. .. JON 28. . . AUG 23. .. COPPER, TOTAL RECOV- ERABLE (UG/L AS CO) < 10 — — < 10 — -- IRON, TOTAL RECOV- ERABLE (UG/L AS PB) 150 -_ -- 340 -- -- LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) <1 -- __ 2 -- -- MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) 30 __ _- 50 __ -- MERCURY TOTAL RECOV- ERABLE (UG/L AS HG) <0.10 __ — <0.10 __ _- SELE- NIUM, TOTAL (UG/L AS SB) <1 -_ __ <1 _- -- SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) <1 __ __ <1 _- -- ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) <10 -- __ 10 -- -- CYANIDE TOTAL PHENOLS (MG/L TOTAL AS CN) (UG/L) <0.010 2 — __ <0.010 3 — — MBTHY- LENE BLUB ACTIVE SUB- STANCE (MG/L) <0.02 -- -- <0.02 -- -- RIO GUAJATACA BASIN 5 1 50011000 CANAL PRINCIPAL DE DIVERSIONES AT LAOO DE GUAJATACA, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°24'02", long 66<>55'27", off Highway 476 at Lago Guajataca outlet, 3.0 mi (4.8 km) southwest of Segunda Unidad Baldorioty de Castro, and 5.3 mi (8.5 km) south of Quebradillas Plaza. DRAINAGE AREA.--Indeterminate. PERIOD OF RECORD.--Water years 1958-64, 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE OCT 1993 20... DEC 09. .. MAR 1994 08... APR 20... JUN 30. .. AUG 18. . . DATE OCT 1993 20. . . DEC 09... MAR 1994 08. .. APR 20. .. JUN 30. .. AUG 18. .. DATE OCT 1993 20. .. DEC 09. .. MAR 1994 08. . . APR 20.. . JUN 30. .. AUG 18. .. TIME 1330 1220 0730 1600 0920 0915 HARD- NESS TOTAL (MG/L AS CAC03) 150 -- -- 130 -- 140 SILICA, DIS- SOLVED (MG/L AS SI 02) 6.6 -- -- 4.9 -- 6.5 DIS- CHARGE, INST. CUBIC FEET PER SECOND 55 70 65 65 65 65 CALCIUM DIS- SOLVED (MG/L AS CA) 53 -- -- 46 -- 51 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 172 -- -- 160 -- 163 SPE- CIFIC CON- DUCT- ANCE (US /CM) 307 299 300 268 289 264 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 3.2 -- -- 4.0 -- 3.7 SOLIDS, DIS- SOLVED (TONS PER DAY) 25.5 -- -- 28.0 -- 28.7 PH WATER WHOLE FIELD (STAND- ARD UNITS) 7.2 7.2 7.5 7.6 7.3 7.7 SODIUM, DIS- SOLVED (MG/L AS NA) 4.3 -- -- 6.5 -- 5.4 RESIDUE TOTAL AT 105 DEG. C, SUS- PENDED (MG/L) 4 2 8 7 4 28 TEMPER- ATURE WATER (DEG C) 25.5 26.0 25.0 26.5 26.0 27.0 SODIUM AD- SORP- TION RATIO 0.2 -- -- 0.2 -- 0.2 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.50 0.30 0.30 — 0.70 0.60 TUR- BID- ITY (NTU) 0.90 0.50 0.50 0.70 1.3 16 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 1.3 -- -- 2.3 -- 1.9 PHOS- PHORUS TOTAL (MG/L AS P) 0.040 0.020 <0.010 -- 0.030 0.010 OXYGEN, DIS- SOLVED (MG/L) 1.0 1.4 3.2 4.0 4.8 3.2 ALKA- LINITY WAT WH TOT FBT FIELD MG/L AS CACO3 150 140 140 130 130 130 ARSENIC TOTAL (UG/L AS AS) 1 -- -- 2 -- — OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 12 17 40 51 60 41 SULFIDE TOTAL (MG/L AS S) <0.5 -- -- <0.5 -- "" BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 -- -- <100 -- -- OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 11 <10 <10 28 13 <10 SULFATE DIS- SOLVED (MG/L AS S04) 7.4 -- -- 8.8 -- 8.4 BORON, TOTAL RECOV- ERABLE (UG/L AS B) <10 -- -- 10 -- -- COLI- FORM, FECAL, 0.45 UM-MF (COLS./ 100 ML) K40 K60 2 K2 120 200 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 6.0 -- -- 9.0 -- 8.2 CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- <1 -- -- STREP- TOCOCCI FECAL, (COLS. PER 100 ML) K17 K4 2 <2 350 220 FLUO- RIDH, DIS- SOLVED (MG/L AS F) 0.20 -- — 0.10 -- 0.20 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) <1 -- -- 1 -- — K = non-ideal count 52 RIO 60AJATACA BASIN 50011000 CANAL PRINCIPAL DE DIVBRSIONBS AT LAGO DE GUAJATACA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE OCT 1993 20. .. DEC 09. . . MAR 1994 08. . . APR 20. . . JUN 30. .. AUG 18. . . COPPER, TOTAL RECOV- ERABLE (UG/L AS CD) <10 — -- 40 -- -- IRON, TOTAL RECOV- ERABLE (UG/L AS FE) 100 -- -- 190 -- -- LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) 2 -- -- 12 -- -- MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) 120 -- -_ 160 -- -- MERCURY TOTAL RECOV- ERABLE (UG/L AS HG) <0.10 -_ — <0.10 — -- SELE- NIUM, TOTAL (UG/L AS SB) <1 _- -- <1 -- -- SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) <1 -- -- <1 — -- ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) 20 -- -- 170 -- -- CYANIDE TOTAL PHENOLS (MG/L TOTAL AS CN) (UG/L) <0.010 <1 — __ <0.010 2 __ __ MBTHY- LBNE BLUE ACTIVE SUB- STANCE (MG/L) <0.02 -- -- 0.05 -- -- RIO GOAJATACA BASIN 50011400 RIO GUAJATACA ABOVE MOUTH NEAR QUEBRADILLAS, PR--Continued WATER-QUALITY RECORDS LOCATION.--Lat 18°28'31", long 66°57'46", Hydrologic Unit 21010002, on left bank at ford 1.7 mi (2.7 km) upBtream from bridge on highway 2, 1.6 mi (2.6 km) west of Quebradillas plaza, 2.1 mi (3.4 km) upstream from Atlantic Ocean, and 6.6 mi (10.6 km) downstream from Lago Guajataca. DRAINAGE AREA.--Indeterminate PERIOD OP RECORD.--Water years 1969 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE OCT 1993 21. .. DEC 10. .. MAR 1994 08. .. MAY 03. .. JUN 30. . . ADG 19. . . DATE OCT 1993 21. . . DEC 10. . . MAR 1994 08. . . MAY 03... JUN 30. . . AUG 19. . . DATE OCT 1993 21. . . DEC 10. . . MAR 1994 08. . . MAY 03... JUN 30. . . AUG 19. .. TIME 1340 1040 1030 0910 0750 0830 HARD- NESS TOTAL (MG/L AS CAC03 ) 220 -- -- 250 -- 230 SILICA, DIS- SOLVED (MG/L AS SI02) 6.7 -- -- 7.0 -- 7.0 DIS- CHARGE, INST. CUBIC FEET PER SECOND 0.0 0.0 9.4 7.8 7.6 7.9 CALCIUM DIS- SOLVED (MG/L AS CA) 71 -- -- 83 -- 79 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 350 -- -- 306 -- 271 SPE- CIFIC CON- DUCT- ANCE (US/CM) 651 1010 561 700 480 495 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 9.6 -- -- 10 -- 8.9 SOLIDS, DIS- SOLVED (TONS PER DAY) -- -- -- 6.43 -- 5.73 PH WATER WHOLE FIELD (STAND- ARD UNITS) 7.8 7.2 7.2 7.9 7.6 7.6 SODIUM, DIS- SOLVED (MG/L AS NA) 44 -- -- 22 -- 18 RESIDUE TOTAL AT 105 DBG. C, SUS- PENDED (MG/L) 11 1 5 4 <1 4 TEMPER- ATURE WATER (DBG C) 28.5 24.5 24.0 25.0 25.0 24.5 SODIUM AD- SORP- TION RATIO 1 -- -- 0.6 -- 0.5 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.30 <0.20 <0.20 0.30 <6.20 <0.20 TUR- BID- ITY (NTU) 3.3 1.0 0.20 0.40 0.40 2.8 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 2.8 -- -- 1.2 -- 1.3 PHOS- PHORUS TOTAL (MG/L AS P) 0.040 0.020 <0.010 0.020 0.020 <0.010 OXYGEN, DIS- SOLVED (MG/L) 3.6 4.0 6.0 5.8 5.0 3.2 ALKA- LINITY WAT WH TOT PET FIELD MG/L AS CAC03 200 200 210 230 220 200 ARSENIC TOTAL (UG/L AS AS) <1 -- -- <1 -- -- OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 45 47 70 69 59 38 SULFIDB TOTAL (MG/L AS S) <0.5 -- -- <0.5 -- " BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 -- -- <100 -- -- OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 12 11 <10 <10 <10 21 SULFATE DIS- SOLVED (MG/L AS SO4) 15 -- -- 6.9 -- 7.2 BORON, TOTAL RECOV- ERABLE (UG/L AS B) 40 -- -- 40 -- -- COLI- FORM, FECAL, 0.45 UM-MF (COLS./ 100 ML) 230 350 26 230 290 190 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 81 -- -- 38 -- 29 CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- <1 -- -- STREP- TOCOCCI FECAL, (COLS. PER 100 ML) 630 240 57 K64 K10 820 FLUO- RIDB, DIS- SOLVED (MG/L AS F) 0.20 -- -- <0.10 -- 0.20 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) <1 -- -- 2 -- -- K = non-ideal count 54 RIO GUAJATACA BASIN 50011400 RIO GUAJATACA ABOVE MOUTH NEAR QUBBRADILLAS, PR—Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE OCT 1993 21. . . DEC 10... MAR 1994 08. .. MAY 03. .. JUN 30. . . AUG 19... COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) 10 -- -- <10 -- -- IRON, TOTAL RECOV- ERABLE (UG/L AS PB) 230 -- -- 80 -- -- LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) 2 -- -- <1 -- -- MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) 60 __ __ 30 -_ -- MERCURY TOTAL RECOV- ERABLE (UG/L AS HG) <0.10 __ __ 0.20 _- _- SELE- NIUM, TOTAL (UG/L AS SB) <1 -- -- <1 -- -- SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) <1 -- __ <1 -- -- ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) <10 -- -- <10 -- -- CYANIDE TOTAL PHENOLS (MG/L TOTAL AS CN) (UG/L) <0.010 <1 __ __ <0.010 <1 __ __ MBTHY- LBNB BLUB ACTIVE SUB- STANCE (MG/L) <0.02 -- -- <0.02 -- -- 55 ATLANTIC OCEAN Droinoge boundaries indeterminate in limestone terrone Boyaney ^0146 River Ltmettone UTUADO EXPLANATION A 0148 SURFACE-WATER STATION AND NUMBER 0123456 KILOMETERS 01234 MILES Figure 14.--R(o Camuy basin. RIO CAMUY BASIN 50014600 RIO CAMUY AT TRES PUEBLOS SINKHOLE, PR LOCATION.--Lat 18°20'42 M , long 66°49'29", Hydrologic Onit 21010002, at Parque de las Cavernas del Rio Camuy, 1.8 mi (2.9 km) southeast from Escuela Segunda Unidad de Santiago Palmer, 4.7 mi (7.6 km) west from Observatorio de Arecibo and 4.8 mi (7.7 km) northeast from Plaza de Lares. DRAINAGE AREA.--Indeterminate. WATER-DISCHARGE RECORDS PERIOD OF RECORD.--June 1990 to current year. GAGE.--Water-stage recorder and crest-stage gage. Datum of gage is 612.21 ft (186.602 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. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES NOV DEC JAN FEB MAR APR JUN JUL 1 56 40 2 74 40 3 104 40 4 108 38 5 112 41 6 112 58 7 84 41 8 69 43 9 76 45 10 84 41 11 76 39 12 68 38 13 60 38 14 55 41 15 52 66 16 51 83 17 58 60 18 59 47 19 51 40 20 47 37 21 45 35 22 43 34 23 49 33 24 46 32 25 43 31 26 54 31 27 e63 32 28 75 32 29 e55 31 30 45 36 31 42 —— TOTAL 2016 1243 MEAN 65.0 41.4 MAX 112 83 MIN 42 31 STATISTICS OF MONTHLY MEAN MEAN 81.8 50.0 MAX 112 55 . 9 (WY) 1991 1992 MIN 64.5 41.4 (WY) 1993 1994 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN-DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 29 29 29 28 30 39 29 28 27 27 26 26 28 38 38 28 27 28 31 51 32 30 30 29 28 28 27 27 27 27 26 927 29.9 51 26 DATA 33.7 42.6 1993 29.8 1991 26 26 26 26 25 25 25 24 24 25 25 25 24 23 23 23 23 23 22 22 22 31 40 28 21 20 20 19 19 19 18 742 23.9 40 18 FOR WATER 25.2 27.7 1993 21.6 1991 17 17 17 17 17 17 16 16 16 16 15 15 15 15 15 15 15 15 14 14 14 14 14 13 12 15 19 15 ___ ___ --- 430 15.4 19 12 YEARS 1990 - 21.3 27.0 1991 15.4 1994 FOR 1994 11087 30. 195 10 11 781 11. 58 23 12 14 13 13 13 12 14 17 13 12 12 12 12 13 12 12 12 12 11 12 12 12 12 13 12 12 14 15 13 13 16 14 399 12.9 17 11 1994 21.7 34.4 1992 12.9 1994 12 15 17 13 13 13 12 12 12 12 12 12 12 12 12 12 13 13 15 12 13 12 12 12 12 11 12 12 12 11 --- 375 12.5 17 11 , BY WATER 36.6 47.3 1993 12.5 1994 11 11 11 12 10 13 16 12 10 11 40 66 52 31 32 124 195 111 57 34 29 27 25 24 23 23 22 22 22 22 21 1119 36.1 195 10 YEAR (WY) 66.5 80.7 1992 36.1 1994 46 90 75 49 39 35 33 33 32 32 35 31 29 37 50 50 48 37 32 30 29 27 25 23 22 22 20 19 20 18 1068 35.6 90 18 44.8 70.3 1992 32.1 1991 WATER YEAR 4 26 May 17 May 5 Apr 29 May 17 May 17 32 36 34 27 22 20 21 26 20 18 18 18 17 16 16 16 16 15 16 15 15 14 14 14 14 13 13 13 13 14 13 569 18.4 36 13 30.3 43.1 1991 18.4 1994 WATER 43 49 30, 299 10 11 1030 12 79 33 16 13 13 12 12 13 31 79 83 82 43 30 25 23 21 21 19 19 18 18 20 22 45 23 22 30 22 21 22 23 19 18 862 27.8 83 12 40.6 66.0 1991 24.7 1993 YEARS 1990 - .4 .2 .4 Sep 7 May 5 Apr 29 Oct 31 .42 Oct 31 20 24 21 21 25 21 19 24 31 21 19 38 41 26 27 21 20 20 25 48 129 116 66 76 70 59 65 55 77 112 1337 44.6 129 19 62.3 83.3 1993 44.6 1994 1994 1992 1994 1993 1994 1994 1991 1991 e Estimated RIO CAMUY BASIN 50014800 RIO CAMUY NEAR BAYANBY, PR LOCATION.--Lat 18°23'48", long 66°49'04 n , Hydrologic Unit 21010002, on left bank at Highway 488, 1.4 mi (2.2 km) southeast of school at Santiago, 0.9 mi (1.4 km) northwest from Becuela Manuel A. Rivera at Bayaney and 9.1 mi (14.6 km) upstream from mouth. 57 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. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES OCT NOV DEC JAN FEB MAR APR JUN JUL AUG SEP 1 e210 59 2 6180 58 3 e290 57 4 6210 55 5 6330 100 6 6290 124 7 e200 72 8 el!5 78 9 6200 84 10 6340 68 11 6260 62 12 6310 58 13 6220 57 14 elOO 68 15 e84 171 16 e76 304 17 e80 171 18 6120 123 19 6160 100 20 e72 90 21 e66 82 22 e62 76 23 e64 71 24 6190 70 25 6130 68 26 e72 65 27 108 62 28 119 67 29 100 64 30 69 67 31 62 --- TOTAL 4889 2651 MEAN 158 88.4 MAX 340 304 KEN 62 55 STATISTICS OF MONTHLY MEAN MEAN 203 119 MAX 427 244 (WY) 1986 1986 KEN 81.6 74.9 (WY) 1988 1989 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN-DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE INSTANTANEOUS LOW FLOW 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 61 53 52 51 51 e58 58 51 49 50 51 50 49 61 684 55 51 50 49 695 55 52 51 49 48 46 46 43 43 43 41 1646 53.1 95 41 DATA 68.6 97.4 1988 49.7 1989 FOR 40 40 38 38 36 35 35 35 34 34 34 35 33 32 32 31 31 31 31 30 32 31 e85 e62 48 41 39 38 37 36 35 1169 37.7 85 30 FOR WATER 48.6 80.9 1988 33.1 1991 34 35 34 34 34 33 32 32 32 31 31 31 31 31 31 30 30 29 29 29 29 29 30 29 30 31 50 38 ___ ___ --- 899 32.1 50 29 YEARS 1984 45.0 78.3 1987 29.2 1992 33 31 29 27 26 27 36 26 22 21 20 20 21 20 19 18 17 16 17 16 20 16 19 21 22 24 31 25 25 37 33 735 23.7 37 16 - 1994 45.3 66.0 1992 23.7 1994 1993 CALENDAR YEAR 34481 94.5 893 31 32 195 62 36 Sep 7 Mar 7 Mar 3 29 31 36 28 27 26 26 24 24 24 23 26 27 27 27 27 26 27 33 27 29 27 26 26 26 26 30 42 34 28 --- 839 28.0 42 23 26 25 25 26 37 36 54 34 31 32 76 157 128 79 109 349 562 271 134 73 63 53 46 41 40 35 32 32 32 32 31 2701 87.1 562 25 63 155 147 78 61 55 43 38 39 36 41 37 35 38 83 96 73 56 48 39 36 34 31 30 30 29 29 28 30 32 --- 1570 52.3 155 28 42 118 105 67 50 41 40 53 39 35 34 34 32 31 30 30 30 29 30 28 28 28 27 27 28 28 28 27 28 30 27 1204 38.8 118 27 29 28 26 26 26 40 176 178 164 73 49 43 33 30 28 27 26 26 26 28 30 60 45 31 49 37 29 32 39 29 27 1490 48.1 178 26 29 33 37 31 41 36 29 31 74 42 32 49 83 46 49 37 28 27 26 85 250 288 153 157 191 149 128 114 133 253 --- 2661 88.7 288 26 , BY WATER YEAR (WY) 103 202 1986 28.0 1994 FOR 1994 22454 61. 562 16 17 1800 10. 15 129 37 26 183 624 1986 43.2 1989 WATER YEAR 5 May 17 Mar 18 Mar 16 May 17 92 May 17 Mar 22 101 141 1992 52.3 1994 76.0 109 1989 38.8 1994 WATER 102 179 61 3820 16 17 6450 17 15 197 67 33 87.6 135 1989 47.9 1993 YEARS 1984 - .5 Oct 7 Mar 18 Mar 16 Oct 7 .66 Oct 7 Mar 22 147 273 1984 88.7 1994 1994 1986 1994 1985 1994 1994 1985 1985 1994 e Estimated 58 RIO CAMUY BASIN 50015700 RIO CAMOY NEAR HATILLO, PR LOCATION.--Lat 18°27'44", long 66°49'56", Hydrologic Unit 21010002, 1.8 ml (2.9 km) southwest of Hatillo plaza, and 1.8 mi (2.9 km) southeast of Camuy plaza, 1.2 mi (1.9 km) south of Planta de Purificacion, and 3.3 mi (5.5 km) upstream from Atlantic Ocean. DRAINAGE AREA.--Indeterminate. WATER-DISCHARGE RECORDS PERIOD OF RECORD.--June 1984 to current year. GAGE.—Water-stage recorder. Elevation of gage is 13 ft (4 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. Gage-height and precipitation satellite telemetry at station. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY OCT NOV DEC JAN FBB MAR MAY JON JUL AUG SEP 1 227 66 2 181 63 3 316 62 4 215 60 5 348 95 6 290 224 7 187 92 8 118 82 9 238 132 10 375 80 11 272 69 12 347 66 13 230 63 14 113 76 15 91 291 16 82 678 17 88 319 18 131 168 19 175 118 20 82 99 21 73 87 22 68 81 23 69 76 24 220 75 25 139 72 26 77 67 27 143 65 28 145 96 29 156 72 30 81 74 31 71 TOTAL 5348 3668 MEAN 173 122 MAX 375 678 MIN 68 60 STATISTICS OF MONTHLY MEAN MEAN 336 180 MAX 735 439 (WY) 1986 1986 MIN 116 115 (WY) 1988 1989 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN-DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE INSTANTANEOUS LOW FLOW 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 69 60 59 58 58 75 66 59 56 57 55 54 53 63 87 58 56 56 55 110 68 63 61 60 58 57 56 55 55 54 54 1905 61.5 110 53 DATA 90.2 176 1993 51.4 1992 FOR 54 54 53 52 51 51 50 50 49 49 51 52 49 49 48 48 48 48 47 47 47 48 94 74 58 51 48 47 45 45 44 1601 51.6 94 44 FOR WATER 62.7 131 1988 46.2 1989 42 41 41 40 40 39 38 38 37 36 36 35 35 34 35 33 32 32 33 32 32 32 32 32 34 35 51 41 ___ ___ 1018 36.4 51 32 YEARS 1984 63.7 134 1987 34.1 1992 35 34 33 32 32 35 53 37 33 32 31 32 33 31 31 31 31 30 30 30 35 31 32 31 30 29 37 31 30 38 37 1027 33.1 53 29 - 1994 64.0 88.1 1992 33.1 1994 1993 CALENDAR YEAR 51971 142 1850 34 35 303 75 43 Apr 29 Mar 23 Mar 20 32 33 38 32 31 30 29 27 27 27 27 28 28 28 28 28 27 28 33 28 29 28 27 27 27 27 32 53 44 39 --- 922 30.7 53 27 33 28 27 29 28 26 41 32 28 28 36 181 183 110 195 528 1050 633 201 95 78 64 54 47 44 42 39 39 39 39 37 4034 130 1050 26 37 e200 e!60 e94 e70 e62 e48 e42 e42 e40 e45 e42 e39 e44 69 133 79 61 52 42 40 39 38 34 35 34 34 32 34 34 --- 1755 58.5 200 32 39 109 200 76 57 45 42 53 43 38 36 34 34 34 34 34 34 31 32 31 31 31 30 29 30 29 28 28 30 32 30 1364 44.0 200 28 30 31 28 28 28 34 164 237 265 116 61 53 41 38 35 33 32 31 31 33 34 64 58 33 56 46 34 36 44 33 30 1817 58.6 265 28 31 36 42 33 43 41 34 32 123 51 35 30 120 55 63 51 36 33 31 120 192 595 202 183 247 244 133 164 91 441 --- 3532 118 595 30 , BY WATER YEAR (WY) 189 411 1986 30.7 1994 FOR 1994 27991 76. 1050 26 27 2910 15. 25 171 45 30 360 1586 1986 59.5 1989 WATER YEAR 7 May 17 May 6 Apr 8 May 17 61 May 17 May 6 138 218 1992 58.5 1994 100 161 1990 44.0 1994 WATER 159 335 76. 8150 25 27 10700 27. 25 302 79 40 112 180 1989 54.8 1993 YEARS 1984 - 7 Oct 7 May 30 Apr 8 Oct 7 75 Oct 7 May 6 203 376 1989 117 1992 1994 1986 1994 1985 1990 1994 1985 1985 1994 e Estimated Droinog* boundar.«* indet«rminat* in ?irrtt*t»rtf ttrrar* f ^ * f I / S £«J><J>4 / J, 026050 S\ Jorddf!\ ) ^^"*S ! '" j) - t / »^Xi/ I », '- ^ '-&« / isiond _. _„'• R,O Ponusw*- i«j?<? \ I b£»lf! "ot r^Jk-'*—-^. •;\> A 0284 SURFACE-WATER STATION AND NUMBER T 0205 QUALITY-OF-WATER STATION AND NUMBER V7 QUALITY-OF-WATER PARTIAL RECORD V 020050 STATION AND NUMBER • WELL AND WELL NUMBER 026140 LAKE-ELEVATION STATION 0123456 KILOMETERS 234 MILES Figure 15.--Rio Grande de Arecibo basin. 60 RIO GRANDE DE ARECIBO BASIN 50020100 LAGO GARZAS NEAR ADJONTAS, PR LOCATION.--Lat 18°08'20", long 66°44'29", Hydrologic Unit 21010002, in power gate tower of Garzas Dam on Rio Vacas, 1.7 mi (2.7 km) upstream from Rio Garzas, and 2.2 mi (3.5 km) southwest of Adjuntas. DRAINAGE AREA.--15.6 mi* (40.4 km1 ). ELEVATION RECORDS PERIOD OF RECORD.--January 1988 to May 1989, March 1993 to current year. GAGE.--Water-stage recorder. Datum of gage is 2,400.00 ft (731.520 m) above mean sea level. Prior to May 25, 1988 at datum 2,376.80 ft (724.449 m), May 25 to July 13, 1988 at datum 2,338.08 ft (712.647 m), July 14, 1988 to May 25, 1989 at datum 2,337.82 ft (712.560 m) above mean sea level. REMARKS.—Lake is formed by earthfill dam completed in 1943. Outflow from lake controlled by vertical-lift sluice gate and fixed-crest concrete spillway. Spillway elevation, 2,415.00 ft (736.09 m). Lake is used for irrigation and power production. Operated by P.R. Electric Power Authorithy. Gage-height and precipitation satellite telemetry at station. EXTREMES OBSERVED FOR PERIOD OF RECORD.--Maximum elevation 2,417.66 ft (736.903 m), May 27, 1993; minimum elevation, 2,364.79 ft (720.788 m), Aug. 23, 1988. EXTREMES OBSERVED FOR WATER YEARS 1989, 1993.--Water Year 1989: Maximum elevation 2,414.76 ft (736.019 m), Jan. 23; minimum elevation, 2,365.84 ft (721.108 m), May 2. Water Year 1994: Maximum elevation 2,415.54 ft (736.256 m), Oct. 07; minimum elevation, 2,378.47 ft (724.958 m), July 19. Capacity table (based on data from Puerto Rico Electric Power Authorithy) Elevation, in feet 2,364 2,382 2,394 NOV Contents, in acre-feet 660 1,500 2,250 Elevation, in feet 2,415 2,418 Contents, in acre-feet 4,082 4,411 ELEVATION (FEET NGVD), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY OBSERVATION AT 24:00 VALUES JAN MAY JUN JUL 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN MAX MIN 2414.80 2414.82 2414.86 2414.81 2414.79 2414.81 2414.90 2414.81 2414.79 2414.78 2414.78 2414.78 2414.77 2414.77 2414.77 2414.82 2414.79 2414.77 2414.77 2414.78 2414.70 2414.64 2414.69 2414.71 2414.62 2414.58 2414.55 2414.66 2414.60 2414.56 2414.52 2414.74 2414.90 2414.52 2414.50 2414.47 2414.53 2414.49 2414.46 2414.40 2414.34 2414.28 2414.22 2414.15 2414.13 2414.05 2413.98 2413.91 2413.84 2413.80 2413.73 2413.66 2413.60 2413.53 2413.45 2413.37 2413.29 2413.18 2413.10 2413.01 2412.92 2412.83 2412.74 2412.64 2413.75 2414.53 2412.64 2412.55 2412.44 2412.35 2412.24 2412.14 2411.99 2411.88 2411.76 2411.66 2411.54 2411.42 2411.30 2411.24 2411.15 2411.02 2410.90 2410.77 2410.65 2410.52 2410.55 A A A A A A A A A A 2410.46 ___ ___ --- 2408. 2408. 2408. 2408. 2407. 2407. 2407. 2407. 2407. 2407. 2406. 2406. 2406. 2406. 2406. 2406. 2405. 2405. 2405. 2405. 2405. 2405. 2404. 2404. 2404. 2404. 2404. 2403. 2403. . - - A A 56 40 25 08 92 76 60 43 28 09 92 77 59 43 25 06 88 71 55 38 27 08 91 72 53 35 16 96 75 __ -- -- 2403.59 2403.42 2403.19 2402.99 2402.81 2402.61 2402.41 2402.17 2401.95 2401.74 2401.52 2401.31 2401.07 2400.87 2400.67 2400.45 2400.21 2400.00 2400.00 2400.00 2400.01 2399.98 2400.00 2399.98 2399.98 2399.95 2399.93 2400.09 ___ ___ --- 2401.17 2403.59 2399.93 2400.45 2400.65 2400.75 2400.80 2400.89 2400.97 2400.78 2400.52 2400.30 2400.13 2399.95 2399.77 2399.60 2399.40 2399.21 2399.00 2398.79 2398.59 2398.39 2398.18 2397.97 2397.75 2397.53 2397.31 2397.10 2396.87 2396.66 2396.44 2396.25 2396.09 2395.93 2398.81 2400.97 2395.93 2395.79 2395.63 2395.49 2395.34 2395.19 2395.03 2394.95 2394.81 2394.65 2394.68 2394.71 2394.63 2394.49 2394.49 2394.69 2394.62 2394.51 2394.39 2394.25 2394.10 2393.95 2393.81 2393.65 2393.50 2393.36 2393.19 2393.32 2393.21 2393.07 2392.92 --- 2394.35 2395.79 2392.92 2392.77 2392.62 2392.44 2392.29 2392.18 2392.02 2391.86 2391.69 2391.52 2391.45 2391.29 2391.12 2390.97 2390.81 2390.65 2390.50 2390.31 2390.12 2389.95 2389.75 2389.61 2389.41 2389.22 2389.01 2388.82 2388.62 2388.44 2388.25 2388.04 2387.84 2387.64 2390.36 2392.77 2387.64 2387.44 2388.07 2388.06 2387.91 2387.73 2387.56 2387.37 2387.17 2386.96 2386.65 2386.35 2386.04 2385.71 2385.52 2385.41 2385.30 2385.19 2385.08 2384.97 2384.86 2384.75 2384.51 2384.29 2384.06 2383.95 2383.74 2383.64 2383.47 2383.25 2383.12 --- 2385.60 2388.07 2383.12 2382.88 2382.66 2382.51 2382.31 2382.08 2381.85 2381.65 2381.46 2381.24 2380.87 2380.68 2380.47 2380.22 2379.90 2379.69 2379.43 2379.05 2378.60 A A A A A A A A A A A A A ___ ___ ___ SEP A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A No gage-height record 50020500 RIO GRANDE DE ARECIBO NEAR ADJUNTAS, PR WATER-QUALITY RECORDS 61 LOCATION.--Lat 18°10'54", long 66°44'12", at Highway 135 bridge, 1.0 mi (1.6 km) upstream from Lago Adjunta8, and 1.5 mi (2.4 km) northwest of Adjunta8 plaza. DRAINAGE AREA.--12.7 mi' (32.9 km') this does not include 6.0 mi' (15.6 km') above Lago Garzas. PERIOD OP RECORD.—Water years 1969-74, 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE OCT 1993 28. .. DEC 14. .. FEB 1994 09. . . APR 13. .. JUL 06. . . ADG 16. .. DATE OCT 1993 28. . . DEC 14. .. FEB 1994 09... APR 13. .. JUL 06. . . AUG 16. .. DATE OCT 1993 28. .. DEC 14. .. FEB 1994 09. . . APR 13. .. JUL 06. . . AUG 16. .. TIME 1220 1045 1040 1455 1105 0930 HARD- NESS TOTAL (MG/L AS CACO3) 110 -- -- 140 — 140 SILICA, DIS- SOLVED (MG/L AS SIO2) 32 -- -- 32 -- 32 DIS- CHARGE, INST. CUBIC FEET PER SECOND 18 11 8.7 5.6 6.0 11 CALCIUM DIS- SOLVED (MG/L AS CA) 30 -- -- 36 -- 36 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 186 -- -- 243 -- 281 SPE- CIFIC CON- DUCT- ANCE (US /CM) 289 331 508 384 900 420 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 9.3 -- -- 11 -- 12 SOLIDS, DIS- SOLVED (TONS PER DAY) 9.29 -- -- 3.70 -- 8.19 PH WATER WHOLE FIELD (STAND- ARD UNITS) 8.2 8.0 7.9 7.8 7.2 7.6 SODIUM, DIS- SOLVED (MG/L AS NA) 18 -- -- 27 -- 43 RESIDUE TOTAL AT 105 DEG. C, SUS- PENDED (MG/L) 5 1 5 4 10 8 TEMPER- ATURE WATER (DEG C) 26.0 22.5 21.5 27.0 25.0 22.5 SODIUM AD- SORP- TION RATIO 0.7 -- -- 1 — 2 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.20 <0.20 0.40 -- 0.60 — TUR- BID- ITY (NTU) 0.70 1.5 0.60 0.60 1.3 0.50 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 1.8 -- -- 2.2 -- 2.2 PHOS- PHORUS TOTAL (MG/L AS P) 0.070 0.120 0.280 -- 0.220 -- OXYGEN, DIS- SOLVED (MG/L) 5.9 5.4 2.8 8.2 8.2 7.8 ALKA- LINITY WAT WH TOT FET FIELD MG/L AS CAC03 110 110 120 130 130 120 ARSENIC TOTAL (UG/L AS AS) <1 -- — <1 — -- OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 75 64 33 108 104 94 SULFIDB TOTAL (MG/L AS S) 0.6 -- -- 0.6 -- " BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 -- -- <100 -- -- OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 13 <10 <10 <10 32 <10 SULFATE DIS- SOLVED (MG/L AS S04) 8.8 -- -- 11 -- 15 BORON, TOTAL RECOV- ERABLE (UG/L AS B) 10 -- -- 20 -- -- COLI- FORM, FECAL, 0.45 UM-MF (COLS./ 100 ML) K1000 2700 240 K660 K10000 2500 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 20 -- -- 46 -- 69 CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- <1 -- -- STREP- TOCOCCI FECAL, (COLS. PER 100 ML) 260 K1200 410 K180 K71000 350 FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.10 -- -- <0.10 -- 0.10 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) <1 -- -- <1 -- -- K = non-ideal count 62 RIO GRANDB DE ARECIBO BASIN 50020500 RIO GRANDB DE ARECIBO NR ADJUNTAS, PR--CONTINI7BD HATER QUALITY DATA, HATER YEAR OCTOBER 1993 TO SBPTBMBBR 1994 DATE OCT 1993 28. .. DEC 14. .. FBB 1994 09. .. APR 13. .. JOL 06. .. AUG 16. .. COPPER, TOTAL RECOV- ERABLE (UG/L AS CO) <10 -- -- <10 -- -- IRON, TOTAL RECOV- ERABLE (UG/L AS PE) 130 -- -- 230 -- -- LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) <1 -- — 1 — -- MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) 50 -- -- 90 -- -- MERCURY TOTAL RECOV- ERABLE (UG/L AS HG) <0.10 — — <0.10 — — SELE- NIUM, TOTAL (UG/L AS SB) <1 -- -- <1 -- -- SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) <1 -- -- <1 -- -- ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) <10 -- -- <10 -- -- CYANIDE TOTAL PHENOLS (MG/L TOTAL AS CN) (UG/L) <0.010 <1 __ __ <0.010 <1 __ __ MBTHY- LENB BLOB ACTIVE SUB- STANCE (MG/L) 0.03 -- -- <0.02 -- -- RIO GRANDB DE ARECIBO BASIN 50025000 RIO GRANDB DE ARECIBO NEAR UTUADO, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°18'11", long 66°41'S9-, at bridge near Highway 10 at km 56.4, 0.5 mi (0.8 km) downstream from Rio de Caguana, and 2.5 mi (4.0 km) north of Utuado plaza. DRAINAGE AREA.--66.0 mi 3 (170.9 km9 ) 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 1993 TO SEPTEMBER 1994 63 DATE OCT 1993 18. .. DEC 07... FEB 1994 07. .. APR 05... JUN 23. .. AUG 08. .. DATE OCT 1993 18. .. DEC 07. .. FEB 1994 07. .. APR 05. .. JUN 23. .. AUG 08. .. DATE OCT 1993 18. .. DEC 07... FEB 1994 07. .. APR 05.. . JUN 23. . . AUG 08... TIME 1030 1020 0840 1055 1250 1100 HARD- NESS TOTAL (MG/L AS CAC03) 95 -- -- 92 -- 110 SILICA, DIS- SOLVED (MG/L AS SI02) 26 -- -- 26 -- 27 DIS- CHARGE, INST. CUBIC PERT PER SECOND 93 38 30 30 18 19 CALCIUM DIS- SOLVED (MG/L AS CA) 26 -- -- 29 -- 30 SOLIDS , SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 155 -- -- 135 -- 189 SPE- CIFIC CON- DUCT- ANCE (US /CM) 245 286 308 290 288 310 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 7.2 -- -- 4.8 -- 8.5 SOLIDS, DIS- SOLVED (TONS PER DAY) 38.8 -- -- 11.0 -- 9.50 PH WATER WHOLE FIELD (STAND- ARD UNITS) 7.8 8.0 7.8 7.9 8.2 7.5 SODIUM, DIS- SOLVED (MG/L AS NA) 12 -- -- 11 -- 18 RESIDUE TOTAL AT 105 DEG. C, SUS- PENDED (MG/L) 63 7 3 10 4 27 TEMPER- ATURE WATER (DEG C) 25.0 23.0 20.0 25.0 30.0 26.5 SODIUM AD- SORP- TION RATIO 0.5 -- — 0.6 — 0.7 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.60 <0.20 <0.20 <0.20 0.20 0.40 TUR- BID- ITY (NTU) 28 1.3 0.60 -- 1.0 7.5 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 2.4 __ -- 2.1 -- 1.8 PHOS- PHORUS TOTAL (MG/L AS P) 0.150 0.120 0.150 0.140 0.130 0.150 OXYGEN, DIS- SOLVED (MG/L) 4.6 8.2 5.0 8.6 8.8 8.1 ALKA- LINITY WAT WH TOT FBT FIELD MG/L AS CAC03 85 98 100 93 100 100 ARSENIC TOTAL (UG/L AS AS) <1 -- -- <1 — -- OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 55 95 55 97 86 99 SULFIDE TOTAL (MG/L AS S) <0.5 -- -- <0.5 -- — — BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 -- -- <100 -- -- OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) <10 12 <10 -- <10 19 SULFATE DIS- SOLVED (MG/L AS S04) 16 -- -- 6.0 -- 24 BORON, TOTAL RECOV- ERABLE (UG/L AS B) 50 -- -- <10 -- -- COLI- FORM, FECAL, 0.45 UM-MP (COLS . / 100 ML) K16000 470 740 26000 450 2000 CHLO- RIDE, DIS- SOLVED (MG/L AS CD 14 -- -- 10 -- 20 CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- <1 -- -- STREP- TOCOCCI FECAL, (COLS. PER 100 ML) 47000 K140 170 K220 K73 330 FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.10 -- -- 0.10 -- <0.10 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) <1 -- -- <1 -- -- K = non-ideal count 64 RIO GRANDB DE ARECIBO BASIN 50025000 RIO GRANDE DE ARECIBO NEAR UTUADO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE OCT 1993 18. . . DEC 07. .. PEB 1994 07. .. APR 05. . . JUN 23. .. AUG 08. . . COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) <10 -- -- 10 -- -- IRON, TOTAL RECOV- ERABLE (UG/L AS PE) 1500 -- -- 320 -- -- LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) 2 -- -- 2 -- -- MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) 120 -- -- 40 -- -- MERCURY TOTAL RECOV- ERABLE (UG/L AS HG) <0.10 -- — <0.10 — — SILVER, SBLB- TOTAL NIUM, RBCOV- TOTAL ERABLE (UG/L (UG/L AS SE) AS AG) <1 <1 __ __ <1 <1 __ __ ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) 10 -- -- <10 -- -- CYANIDE TOTAL PHENOLS (MG/L TOTAL AS CN) (UG/L) <0.010 <1 __ __ <0.010 3 __ __ MBTHY- LENE BLUE ACTIVE SUB- STANCE (MG/L) 0.02 — -- 0.04 -- -- RIO GRANDE DE ARECIBO BASIN 50025155 RIO SALIBNTE AT COABBY NEAR JAYUYA, PR LOCATION.--Lat 18°12'48", long 66°33'49", Hydrologic Unit 21010002, 2.0 mi (3.2 km) southeast of Jayuya, 1.4 mi (2.2 km) northeast of Hacienda Gripifias. DRAINAGE AREA.--9.25 ml' (23.96 km3 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--October 1989 to current year. GAGE.--Water-stage recorder. Elevation of gage is 1,706 ft (520 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. Gage-height and precipitation satellite telemetry at station. DISCHARGE, CUBIC FEET PER SECOND, HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY OCT NOV DEC JAN FEB MAR MAY JUN AUG 1 25 11 2 37 10 3 24 10 4 111 9.5 5 38 9.3 6 21 9.1 7 18 8.8 8 16 8.3 9 14 8.3 10 13 8.3 11 13 8.2 12 19 7.9 13 15 8.1 14 12 8.8 15 11 14 16 45 21 17 33 14 18 24 13 19 21 11 20 16 10 21 13 12 22 12 10 23 25 9.6 24 16 9.3 25 13 8.6 26 13 8.0 27 54 7.9 28 24 8.8 29 16 9.3 30 13 8.0 31 11 --- TOTAL 736 300.1 MEAN 23.7 10.0 MAX 111 21 MEN 11 7.9 AC-FT 1460 595 CFSM 2.57 1.08 IN. 2.96 1.21 7.4 7.1 7.1 7.1 7.1 7.1 6.7 6.6 6.4 6.3 6.1 6.1 31 15 13 8.2 7.6 7.8 8.1 8.4 7.3 7.1 7.1 6.7 6.6 6.3 6.1 6.5 6.6 6.4 6.1 253.0 8.16 31 6.1 502 .88 1.02 STATISTICS OF MONTHLY MEAN DATA MEAN 38.4 24.0 MAX 70.5 40.0 (WY) 1991 1991 MEN 11.6 10.0 (WY) 1992 1994 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN-DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE INSTANTANEOUS LOW FLOW ANNUAL RUNOFF (AC-FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 13.4 22.7 1993 8.07 1992 FOR 6.1 6.1 6.0 5.7 5.6 5.5 5.4 5.2 5.1 5.1 5.4 5.5 5.1 5.1 4.9 .7 .8 .9 .7 .9 .9 .9 .9 .9 •5 .6 .3 .4 .2 .1 .1 159.6 5 15 7.9 4.1 317 56 64 FOR WATER 18.8 48.1 1992 5 .15 1994 1993 .0 .0 .0 .0 .0 3.9 3.8 3.8 3.6 3.6 3.6 3.6 3.6 3.6 4.8 3.9 3.7 3.6 3.6 5.3 4.2 3.9 4.1 4.1 3.9 3.7 3.9 25___ ___ --- 130.8 4.67 25 3.6 259 .51 .53 YEARS 1989 10.8 16.0 1993 4.67 1994 13 6.2 5.0 .4 .4 .5 .9 .4 .1 5.2 4.5 5.7 9.9 5.4 5.2 5.1 4.3 4.1 4.0 3.9 3.8 3.8 3.8 3.8 3.7 3.6 3.6 3.6 3.5 3.5 3.5 148.4 4.79 13 3.5 294 .52 .60 - 1994 9.69 13.0 1991 4.79 1994 CALENDAR YEAR 8461. 23. 390 6. 6. 3 2 Apr 29 1 Dec 11 4 Dec 25 16780 2. 34. 40 14 7. 51 03 8 3.5 4.0 4.0 4.0 4.2 7.0 5.8 8.5 4.7 3.8 4.0 5.8 4.4 4.5 4.6 4.5 5.2 5.4 4.2 3.9 4.6 4.7 4.3 4.0 5.0 4.7 31 14 5.6 4.6 --- 178.5 5.95 31 3.5 354 .64 .72 4.1 3.8 3.6 3.6 3.6 5.8 6.9 4.7 4.1 4.9 26 18 7.2 71 27 9.2 16 9.3 7.5 5.8 5.2 4.7 4.5 4.0 3.8 3.8 3.8 5.3 6.7 4.2 3.9 292.0 9.42 71 3.6 579 1.02 1.17 3.6 e607 e!79 e57 e33 e23 e!9 e!6 e!3 e!2 e9.8 e8.6 e7.4 e6.2 e5.1 5.2 4.8 5.0 4.7 4.5 4.3 4.1 3.9 3.8 3.7 3.6 3.6 3.8 3.8 4.6 --- 1063.1 35.4 607 3.6 2110 3.83 4.28 4.4 3.3 3.1 3.1 3.1 3.1 3.3 3.1 2.9 2.7 2.7 2.7 2.6 2.5 2.5 2.5 2.5 2.9 3.7 2.9 2.7 2.6 2.6 2.6 2.6 2.5 2.3 2.4 2.5 2.6 2.6 87.6 2.83 4.4 2.3 174 .31 .35 2.9 2.9 2.6 2.6 2.8 3.1 4.6 16 9.9 4.5 3.6 3.2 3.0 2.9 3.1 2.8 2.7 2.6 9.2 10 3.9 3.2 3.0 2.9 5.2 3.5 3.1 149 23 7.5 5.2 304.5 9.82 149 2.6 604 1.06 1.22 4.9 4.7 4.8 3.9 3.6 3.5 3.5 3.3 3.3 3.3 4.8 4.3 3.4 3.2 3.1 3.0 3.6 5.1 17 43 54 24 9.4 30 17 10 9.7 6.8 5.9 29--- 325.1 10.8 54 3 .0 645 1.17 1.31 , BY WATER YEAR (WY) 21.7 46.4 1993 5.95 1994 FOR 1994 3978 10 607 2 2 5900 13 2 7890 1 16 17 4 3 29.7 60.5 1993 5.35 1990 WATER YEAR .7 .9 Jun 2 .3 Jul 27 .5 Jul 23 Jun 2 . 92 Jun 2 . 1 Jul 26 .18 .00 .9 .1 22.9 35.4 1994 10.1 1991 11.5 19.5 1993 2.83 1994 WATER 20 29 10 607 2 2 5900 13 2 14490 2 29 38 11 4 15.5 21.6 1992 9.82 1994 YEARS 1989 .0 .7 .9 Jun .3 Jul .5 Jul Jun .92 Jun . 1 Jul .16 .37 .3 23.0 45.2 1990 10.8 1994 - 1994 1993 1994 2 1994 27 1994 23 1994 2 1994 2 1994 26 1994 e Estimated RIO GRANDB DE ARECIBO BASIN 50026050 RIO CAONILLAS ABOVE IAGO CAONILLAS NEAR JAYUYA, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°13'26", long 66°38'22", 300 ft (91 m) off Highway 531, 700 ft (213 m) upstream from Caonillas, 3.3 ml (5.3 km) northwest of Jayuya plaza. DRAINAGE AREA.--40.4 mi 3 (104.6 km*). PERIOD OF RECORD.--Water years 1979 to current year. WATBR-QOALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 Lago DATE OCT 1993 28. .. DEC 14... FBB 1994 09... APR 13. .. JUL 06. .. ADG 16. .. DATE OCT 1993 28... DEC 14. .. FBB 1994 09. . . APR 13. .. JUL 06. .. ADG 16. .. DATE OCT 1993 28. .. DEC 14. . . FBB 1994 09. .. APR 13. .. JUL 06. .. AUG 16. .. TIME 0955 0820 0825 1200 0900 1200 HARD- NESS TOTAL (MG/L AS CAC03) 59 -- — -- -- 93 SILICA, DIS- SOLVED (MG/L AS SIO2) 22 -- -- -- -- 23 DIS- CHARGE, INST. CUBIC FEET PER SECOND 73 41 14 20 8.3 7.6 CALCIUM DIS- SOLVED (MG/L AS CA) 15 -- -- -- -- 25 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 109 -- -- -- -- 160 SPE- CIFIC CON- DUCT- ANCE (US/CM) 166 169 265 268 255 254 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 5.3 -- -- -- -- 7.5 SOLIDS, DIS- SOLVED (TONS PER DAY) 21.5 -- -- -- -- 3.31 PH WATER WHOLE FIELD (STAND- ARD UNITS) 7.7 7.7 8.0 7.8 7.9 7.4 SODIUM, DIS- SOLVED (MG/L AS NA) 8.9 -- -- -- -- 17 RESIDUE TOTAL AT 105 DBG. C, SUS- PENDED (MG/L) 174 43 8 -- 2 6 TEMPER- ATURE WATER (DBG C) 23.0 20.5 22.0 24.5 26.0 28.0 SODIUM AD- SORP- TION RATIO 0.5 -- -- -- -- 0.8 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.30 0.40 0.40 — <0.20 -- TUR- BID- ITY (NTU) 120 23 0.80 -- 0.50 0.30 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 2.1 -- -- -- -- 1.4 PHOS- PHORUS TOTAL (MG/L AS P) 0.090 0.150 0.110 -- 0.090 -- OXYGEN, DIS- SOLVED (MG/L) 5.2 4.6 3.0 8.8 8.6 8.2 ALKA- LINITY WAT WH TOT FBT FIELD MG/L AS CAC03 62 57 92 85 85 82 ARSENIC TOTAL (UG/L AS AS) <1 -- — <1 — -- OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 61 51 34 108 108 107 SULFIDB TOTAL (MG/L AS S) <0.5 -- -- <0.5 -- ~- BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) 100 -- -- <100 -- -- OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 22 11 <10 -- <10 <10 SULFATE DIS- SOLVED (MG/L AS SO4) 10 — -- -- -- 21 BORON, TOTAL RECOV- ERABLE (UG/L AS B) 10 — -- 20 -- -- COLI- FORM, FECAL, 0.45 UM-MF (COLS./ 100 ML) 27000 17000 210 200 210 K20 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 8.2 -- -- -- -- 16 CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- <1 -- -- STREP- TOCOCCI FECAL, (COLS. PER 100 ML) K17000 23000 190 620 K160 K40 FLUO- RIDB, DIS- SOLVED (MG/L AS F) 0.10 — -- -- -- 0.10 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) 2 -- -- <1 -- -- K = non-ideal count RIO GRANDB DB ARBCIBO BASIN 50026050 RIO CAONILLAS ABOVE LACK) CACHILLAS NEAR JAYUYA, PR--Continued HATER-QUALITY DATA, HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 67 DATE OCT 1993 28... DEC 14... FBB 1994 09... APR 13... JUL 06... AUG 16... COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) 10 -- -- <10 — -- IRON, TOTAL RECOV- ERABLE (UG/L AS FB) 5700 -- -- 140 -- -- LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) 2 — — 4 -- — MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) 420 -- -- 40 -- -- MERCURY TOTAL RECOV- ERABLE (UG/L AS HG) <0.10 — — <0.10 — — SELE- NIUM, TOTAL (UG/L AS SB) <1 -- -- <1 -- -- SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) <1 -- -- <1 -- -- ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) 20 -- -- <10 -- -- CYANIDE TOTAL PHENOLS (MG/L TOTAL AS CN) (UG/L) <0.010 <1 __ __ •eO.010 <1 __ __ MBTHY- LENB BLUB ACTIVE SUB- STANCE (MG/L) <0.02 -- -- <0.02 -- -- 68 RIO QRANDB DB ARECIBO BASIN 50026140 LAGO CAONILLAS AT CAONILLAS, PR LOCATION.--Lat 18°16'43", long 66°39'24", Hydrologic Unit 21010001, at Lago Caonillas Dam on Rio Caonillas, 2.9 ml (4.7 km) northeast of Plaza de Utuado, 0.3 mi (0.6 km) west from Iglesia Santa Maria del Monte Carmelo, and 1.8 mi (3.0 km) northwest from Hacienda Carbonell. DRAINAGE AREA.--48.4 mi 1 (125.4 km1 ). PERIOD OF RECORD.--March 1991 to current year. ELEVATION RECORDS GAGE.—Water stage recorder. Datum of gage is mean sea level. REMARKS.--Lago Caonillas was completed in 1948. The dam is a concrete gravity structure with a total length of 815 ft (248 m), a maximum height of 235 ft (72 m), and a maximum base width of 195 ft (59 m). Nonoverflow sections on each abutment have a total length of 603 ft (184 m). The dam is the main unit of Caonillas Hydroelectric Project, and provides 49,000 acre-feet (60 hm3 ) of usable storage for power generation at Caonillas Power Plant No. 1 located 2.5 mi (4.0 km) downstream from the dam. 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, 825.39 ft (251.58 m), June 7, 1993; minimum elevation, 774.30 ft (226.86 m), July 13, 1994. EXTREMES OBSERVED FOR CURRENT YEAR.--Maximum elevation, 796.47 ft (242.76 m), Oct. 10; minil (226.86 m), July 13. elevation, 744.30 ft Capacity Table (based on data from Puerto Rico Electric Power Authority) Elevation, in feet 705 750 Contents, in acre-feet 0 8,421 Elevation, in feet 800 830 Contents, in acre-feet ELEVATION (FEET NGVD), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY OBSERVATION AT 24s00 VALUES NOV DEC JAN MAR APR MAY JUN 27,982 46,161 JUL AUG 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 795.45 795.45 795.62 796.04 795.93 796.00 796.18 796.31 796.42 796.12 795.79 795.66 794.95 794.31 794.37 794.22 794.71 793.99 793.08 793.17 793.16 793.26 793.08 791.01 792.35 791.62 792.01 793.18 793.67 793.87 794.00 794.09 794.22 794.29 794.36 794.50 792.91 792.98 792.38 792.47 792.55 792.61 792.65 792.71 792.84 793.17 793.64 792.74 792.88 792.91 792.99 793.05 793.10 793.16 793.23 793.24 792.98 791.53 791.34 791.22 791.26 ___ 791.27 791.20 791.10 791.13 791.14 791.15 791.15 790.99 790.88 790.88 790.32 789.60 789.50 789.81 789.88 789.88 789.73 789.66 789.68 789.24 789.15 789.11 789.08 788.94 788.92 788.90 788.89 788.82 788.74 788.67 788.63 788.62 788.59 788.45 788.34 788.20 788.17 788.13 788.09 788.06 788.01 788.01 787.98 787.46 787.22 787.07 787.02 786.66 786.60 786.28 786.14 786.17 786.15 785.99 786.01 786.00 785.96 785.57 785.53 784.92 784.57 784.51 784.45 784.41 784.33 784.28 784.23 784.17 784.10 A A A A A A A A A A A A A A A A A A A A A ___ ___ ___ A A A A A A A A A A A A A A A A A A A A A A A 778.24 778.16 778.09 777.93 777.90 777.86 777.80 776.41 776.43 776.84 776.89 776.87 776.83 776.41 776.31 776.28 776.24 776.17 776.15 775.96 775.89 775.93 775.90 775.91 775.96 775.77 774.36 773.27 772.26 771.95 770.19 769.23 767.19 766.18 764.34 763.21 763.12 762.10 ___ 761.36 759.07 756.91 757.03 757.03 757.03 757.04 757.04 757.04 755.95 755.93 754.43 753.16 752.72 752.72 752.72 752.72 752.72 752.72 752.72 752.72 A 752.72 751.68 751.68 751.58 749.59 749.59 749.59 749.59 749.59 749.59 749.59 749.59 749.59 749.59 749.59 749.59 751.24 751.26 751.27 751.27 751.27 751.27 751.27 751.27 751.27 749.77 748.25 748.26 748.27 746.37 746.37 746.37 746.37 746.28 746.33 746.26 746.30 746.32 745.09 ___ 745.03 744.96 744.97 745.06 744.94 744.86 744.83 744.77 744.75 744.73 744.62 745.21 745.10 744.97 744.86 744.73 744.61 744.58 744.51 744.50 744.48 744.48 744.47 744.45 744.71 744.66 744.63 744.67 744.67 744.74 744.66 744.71 744.72 745.71 745.75 745.64 745.52 745.40 745.29 745.11 745.07 745.08 745.02 744.95 744.89 744.83 744.67 744.65 744.56 744.79 745.13 745.17 745.05 744.98 744.91 744.86 744.94 745.01 A 750.83 751.10 751.21 751.34 751.39 751.41 751.40 751.36 751.41 751.33 751.27 751.20 751.10 751.03 751.06 751.00 750.96 751.03 751.02 750.77 750.55 750.60 751.04 751.85 752.90 753.19 753.49 753.81 753.59 753.75 753.83 753.87 753.87 --- TOTAL24624.98 23788.00 24486.04 24394.48 MEAN 794.35 792.93 789.87 786.92 MAX 796.42 794.50 791.27 788.62 MIN 791.01 791.22 788.63 784.51 —— 23190.14 —— 773.00 776.89 —— 762.10 --- 22465.13 23087.21 --- 748.84 744.75 --- 751.27 745.21 --- 745.09 744.45 --- 22556.42 --- 751.88 753.87 --- 750.55 A No gage-height record RIO GRANDE DE ARBCIBO BASIN 50027250 RIO GRANDE DE ARECIBO BELOW LAGO DOS BOCAS NEAR FLORIDA, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°20'50", long 66°40'02", at pedestrian bridge, 0.7 mi (1.1 km) downstream from Lago Dos Bocas and 6.6 mi (10.6 km) west of Florida plaza. DRAINAGE AREA.--169 mi» (436 km») does not include 6.0 mi» (15.6 km') above Lago Garzas. PERIOD OP RECORD.--Water years 1970-71, 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 69 DATE OCT 1993 18... DEC 07. .. FEB 1994 07. .. APR 05. . . JUN 23. .. AUG 08. .. DATE OCT 1993 18. . . DEC 07. .. FEB 1994 07. .. APR 05. .. JUN 23. .. AUG 08. . . DATE OCT 1993 18. . . DEC 07. . . FBB 1994 07. .. APR 05. .. JUN 23. . . AUG 08. .. TIME 0905 0840 1020 0850 1130 0900 HARD- NESS TOTAL (MG/L AS CAC03) 79 -- -- -- -- 93 SILICA, DIS- SOLVED (MG/L AS SI02) 21 -- -- -- -- 21 DIS- CHARGE, INST. CUBIC FEET PER SECOND 18 21 17 19 24 21 CALCIUM DIS- SOLVED (MG/L AS CA) 22 -- -- -- -- 25 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 123 -- -- -- -- 148 SPE- CIFIC CON- DUCT- ANCE (US /CM) 196 215 232 225 235 244 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 5.8 -- -- -- -- 7.3 SOLIDS, DIS- SOLVED (TONS PER DAY) 5.96 -- -- -- -- 8.38 PH WATER WHOLE FIELD (STAND- ARD UNITS) 7.4 7.3 7.2 7.6 7.1 7.5 SODIUM, DIS- SOLVED (MG/L AS NA) 9.4 -- -- -- -- 12 RESIDUE TOTAL AT 105 DEC. C, SUS- PENDED (MG/L) 9 2 5 -- 6 1 TEMPER- ATURE WATER (DEC C) 26.0 25.0 24.5 25.0 28.0 29.0 SODIUM AD- SORP- TION RATIO 0.5 -- -- -- — 0.5 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) — <0.20 <0.20 0.20 0.30 0.50 TUR- BID- ITY (NTU) 1.8 0.70 0.50 -- 1.1 1.5 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 2.1 -- -- -- -- 2.2 PHOS- PHORUS TOTAL (MG/L AS P) -- 0.010 0.040 0.040 0.020 0.050 OXYGEN, DIS- SOLVED (MG/L) 4.4 3.8 3.5 6.2 6.6 7.0 ALKA- LINITY WAT WH TOT FBT FIELD MG/L AS CACO3 70 81 87 91 87 90 ARSENIC TOTAL (UG/L AS AS) <1 -- -- <1 -- — OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 53 45 42 74 84 90 SULFIDE TOTAL (MG/L AS S) <0.5 -- -- -- -- "" BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 -- -- <100 -- -- OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) <10 19 <10 -- <10 220 SULFATE DIS- SOLVED (MG/L AS SO4) 11 -- -- -- -- 13 BORON, TOTAL RECOV- ERABLE (UG/L AS B) <10 -- -- <10 -- -- COLI- FORM, FECAL, 0.45 UM-MF (COLS./ 100 ML) 310 K10 54 K780 K20 K18 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 9.2 -- -- -- -- 14 CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- <1 -- -- STREP- TOCOCCI FECAL, (COLS. PER 100 ML) K1600 K170 20 K80 K120 K60 FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.20 -- -- -- -- <0.10 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) <1 -- -- <1 -- -- K = non-ideal count 70 DATE OCT 1993 18. .. DEC 07... PBB 1994 07. .. APR 05... JUN 23. . . AUQ 08. .. RIO GRANDB DB ARBCIBO BASIN 50027250 RIO GRANDB DB ARBCIBO BELOW LAQO DOS BOCAS NEAR FLORIDA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MANQA- COPPBR, IRON, LEAD, NBSB, MERCURY SILVER, ZINC, TOTAL TOTAL TOTAL TOTAL TOTAL SBLB- TOTAL TOTAL RECOV- RECOV- RBCOV- RBCOV- RECOV- NIUM, RBCOV- RECOV- CYANIDE BRABLE BRABLB BRABLE ERABLB ERABLE TOTAL ERABLE BRABLB TOTAL PHENOLS (UQ/L (UQ/L (UQ/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL AS CU) AS PB) AS PB) AS MN) AS HG) AS SB) AS AG) AS ZN) AS CN) (UG/L) 170 190 <1 <1 30 20 <0.10 <0.10 <1 <1 <1 <0.010 <0.010 <1 METHY- LENE BLUE ACTIVE SUB- STANCE (MG/L) 0.02 0.05 RIO GRANDB DB ARBCIBO BASIN 50027750 RIO GRANDE DB ARBCIBO ABOVE ARBCIBO, PR LOCATION.--Lat 18°25'22", long 66°41'58 H , Hydrologic Unit 21010002, 0.5 mi (0.8 km) upstream from Rio Tanama, 3.6 mi (5.8 km) south of Arecibo and 4.9 mi (7.9 km) above mouth, and 10.4 mi (16.7 km) downstream from Lago Dos Bocas. DRAINAGE ARBA.--200 mi* (520 km1 ), approximately, of which an undetermined amount does not contribute directly to surface runoff. WATER-DISCHARGE RECORDS PERIOD OF RECORD.--April 1982 to current year. GAGE.—Water-stage recorder. Elevation of gage is 30 ft (9 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. Flow regulated by Lago Dos Bocas Dam 10.4 mi (16.7 km) upstream from gage. Gage-height and precipitation satellite telemetry at station. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES 71 DAY NOV DEC JAN FBB MAR APR MAY JUN ADG SEP 1 346 431 2 188 613 3 215 555 4 193 219 5 616 57 6 352 583 7 69 310 8 338 201 9 396 254 10 369 85 11 357 48 12 84 43 13 197 42 14 362 72 15 58 239 16 175 528 17 132 645 18 258 648 19 587 172 20 371 50 21 92 53 22 155 430 23 50 533 24 216 105 25 454 41 26 512 56 27 182 624 28 432 241 29 86 100 30 47 226 31 111 —— TOTAL 8000 8204 MEAN 258 273 MAX 616 648 MIN 47 41 AC-FT 15870 16270 CFSM 1.29 1.37 IN. 1.49 1.53 STATISTICS OF MONTHLY MEAN MEAN 667 586 MAX 1984 1413 (WY) 1986 1986 MIN 221 247 (WY) 1992 1992 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN- DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE ANNUAL RUNOFF (AC-FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 129 40 72 93 36 207 115 268 299 206 56 409 266 46 33 31 59 106 62 46 524 310 71 52 92 31 35 120 198 77 131 4220 136 524 31 8370 .68 .78 DATA 305 570 1988 90.3 1992 FOR 116 30 27 70 141 69 204 145 154 60 281 113 122 222 146 86 273 50 98 63 74 28 82 88 36 43 383 252 274 199 153 4082 132 383 27 8100 .66 .76 FOR WATER 253 437 1988 132 1994 36 62 31 80 31 30 82 28 27 28 26 27 75 37 143 77 66 209 74 37 52 169 238 249 105 68 32 31 ___ ___ 2150 76.8 249 26 4260 .38 .40 YEARS 1982 232 428 1988 76.8 1994 76 137 39 76 38 39 366 545 156 28 23 21 22 23 25 38 26 20 21 324 522 52 21 17 17 18 37 30 22 23 25 2827 91.2 545 17 5610 .46 .53 - 1994 217 351 1985 91.2 1994 1993 CALENDAR YEAR 104780 287 856 31 55 207800 1. 19. 589 255 58 Apr 16 Dec 16 Dec 14 44 49 24 23 21 20 20 103 364 83 25 18 103 53 22 16 17 17 125 26 94 130 170 101 34 457 445 42 44 453 222 145 --- 3417 114 457 16 6780 .57 .64 , BY WATER 383 617 1986 114 1994 157 273 221 110 38 33 34 45 41 221 66 265 464 279 100 66 82 91 352 201 499 231 755 71 56 96 424 111 64 34 34 5514 178 755 33 10940 .89 1.03 YEAR (WY) 632 2000 1986 178 1994 78 52 57 64 51 47 45 42 35 31 30 28 28 28 70 71 30 613 102 45 40 elOO e53 e43 e56 e45 e42 e38 e46 70 2080 69.3 613 28 4130 .35 .39 368 683 1987 69.3 1994 FOR 1994 WATER YEAR 48003 132 755 16 22 1270 3.84 95210 .66 8.93 354 66 28 May 23 Apr 14 Mar 30 Nov 16 Nov 16 56 37 35 34 31 35 46 40 35 35 36 35 37 42 39 43 50 46 45 44 230 61 245 141 52 167 55 31 36 45 80 1944 62.7 245 31 3860 .31 .36 260 374 1987 62.7 1994 WATER 385 729 132 14800 16 22 45800 18 278900 1 26 784 254 56 36 34 58 57 35 25 33 120 43 270 64 54 35 33 32 118 48 58 128 219 130 81 33 25 35 37 281 61 38 303 43 2567 82.8 303 25 5090 .41 .48 264 474 1988 82.8 1994 YEARS 1982 - May 18 Apr 14 Mar 30 May 18 .22 May 18 .92 .15 127 131 33 50 19 20 73 40 30 30 38 30 30 28 32 269 58 450 179 37 79 151 33 30 37 215 129 96 231 293 --- 2998 99.9 450 19 5950 .50 .56 455 1080 1984 99.9 1994 1994 1986 1994 1985 1994 1994 1985 1985 e Estimated 72 RIO GRANDE DB 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 mi (1.9 km) upstream from natural tunnel, 1.5 mi (2.4 km) northeast of Angeles, and 5.8 mi (9.3 km) northwest of Otuado. DRAINAGE AREA.--18.4 mi 1 (47.7 km 1 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--June 1944 to June 1958 (daily stage and two to four Resources Authority), November 1959 to current year. aasurements per month by Puerto Rico Water GAGE.--Water-stage recorder and crest-stage gage. Datum of gage is 938.32 ft (286.000 m) above mean sea level. Datum of gage was lowered 3.00 ft (0.914 m) on Oct. 1978. Prior to Nov. 17, 1966, non-recording gage and Nov. 17, 1966 to Sept. 30, 1978 recording gage, both at present site. REMARKS.--Records fair except those for estimated daily discharges, which are poor. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES NOV DEC JAN FEB MAR MAY JUN JUL AUG SEP 1 30 29 2 107 28 3 e47 29 4 e48 27 5 43 44 6 43 36 7 35 28 8 33 34 9 33 31 10 32 30 11 30 30 12 29 26 13 28 27 14 27 33 15 26 44 16 30 70 17 35 55 18 28 39 19 26 33 20 26 31 21 25 29 22 25 28 23 42 27 24 27 .27 25 26 27 26 37 26 27 72 26 28 70 25 29 44 37 30 33 30 31 30 TOTAL 1167 986 MEAN 37.6 32.9 MAX 107 70 MIN 25 25 AC-FT 2310 1960 CFSM 2.05 1.79 IN. 2.36 1.99 STATISTICS OF MONTHLY MEAN MEAN 79.8 68.8 MAX 195 159 (WY) 1990 1969 MIN 25.4 29.3 (WY) 1963 1979 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN-DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE INSTANTANEOUS LOW FLOW ANNUAL RUNOFF (AC-FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 26 25 25 25 34 31 25 24 23 23 23 22 52 114 e50 e32 29 31 30 37 29 27 27 26 25 25 24 25 24 24 23 960 31.0 114 22 1900 1.68 1.94 DATA 42.9 121 1966 21.5 1965 FOR 23 23 22 22 21 21 20 20 21 20 20 19 19 18 18 18 17 17 17 17 16 45 38 23 19 17 17 16 17 16 16 633 20.4 45 16 1260 1.11 1.28 16 16 16 17 17 16 16 16 16 15 15 15 15 15 16 15 15 14 14 14 14 14 15 15 14 14 14 24 ___ ___ --- 433 15.5 24 14 859 .84 .88 FOR WATER YEARS 1960 29.1 50.1 1966 18.0 1974 24.9 40.5 1961 13.2 1965 22 15 15 15 15 17 18 16 15 15 14 21 26 15 14 14 13 13 12 12 14 13 13 13 12 11 11 10 15 15 12 456 14.7 26 10 904 .80 .92 - 1994 24.5 71.2 1972 11.0 1984 1993 CALENDAR YEAR 13062 35.8 342 16 17 25910 1.94 26.41 60 27 19 Sep 6 Mar 23 Jul 28 18 33 26 16 17 14 13 13 12 12 12 13 12 12 12 11 15 16 14 13 12 13 12 11 12 11 12 15 12 12 --- 426 14.2 33 11 845 .77 .86 11 10 9.9 12 10 16 13 12 11 15 20 28 20 20 16 39 31 20 16 14 13 12 11 11 11 11 10 15 19 11 11 478.9 15.4 39 9.9 950 .84 .97 17 59 38 16 13 12 11 15 12 14 13 11 13 13 24 28 18 15 12 11 10 10 10 10 9.9 9.6 9.5 11 13 10--- 468.0 15.6 59 9.5 928 .85 .95 12 16 19 15 11 11 12 16 11 9.7 9.5 9.4 8.6 7.8 7.5 7.1 7.6 7.3 7.3 7.1 6.9 6.8 6.6 6.5 6.6 6.3 6.4 6.0 6.9 7.1 6.7 284.7 9.18 19 6.0 565 .50 .58 6.8 6.3 5.6 5.4 12 11 42 54 55 28 17 13 12 11 13 11 9.7 10 14 12 11 10 9.3 13 14 10 12 21 20 13 12 494.1 15.9 55 5.4 980 .87 1.00 21 21 15 13 12 11 13 18 13 12 12 13 12 12 11 10 9.9 13 20 17 86 69 47 56 e31 e24 e44 28 51 36--- 750.9 25.0 86 9.9 1490 1.36 1.52 , BY WATER YEAR (WY) 37.0 142 1969 9.70 1984 FOR 1994 7537 20 114 5 6 1370 8 5 14950 1 15 35 16 10 58.0 193 1963 12.4 1977 WATER YEAR .6 .7 Dec 14 . 4 Aug 4 .4 Jul 29 Oct 2 .76 Oct 2 .4 Jul 29 .12 .24 42.2 116 1979 15.6 1994 36.6 65.7 1981 9.18 1994 WATER 47 71 20 2170 5 6 12200 17 5 34020 2 34 83 33 16 46.1 110 1979 15.9 1994 YEARS 1960 .0 .1 .7 May .4 Aug .4 Jul May .45 May .4 Jul .55 .68 73.0 177 1961 25.0 1994 - 1994 1969 1994 17 1963 4 1994 29 1994 18 1985 18 1985 29 1994 e Estimated 73 RIO GRANDS DB ARECIBO BASIN 50028000 RIO TANAMA NEAR UTUADO, PR--Continued WATER-QUALITY RECORDS PERIOD OP RECORD.—Water years 1958 to current year. PERIOD OP DAILY RECORD.-- SUSPENDED SEDIMENT DISCHARGE: January 1968 to current year. INSTRUMENTATION.--USD-49 SEDIMENT SAMPLER SINCE OCTOBER 1968. AUTOMATIC SEDIMENT SAMPLER SINCE 1990 REMARKS.--Sediment samples were collected by a local observer on a weekly basis and during high flow events. Estimates for period of missing daily record were made from a sediment transport curve developed from a period of record over 5 years. EXTREMES POR PERIOD OP 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 LOADSi 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 POR CURRENT YEAR 1994.-- SBDIMENT CONCENTRATIONS: Maximum daily mean, 597 mg/L December 14, 1993; minimum daily mean, 2.0 mg/L several days. SEDIMENT LOADS: Maximum daily, 1,170 tons (1,060 tonnes) December 14, 1993; minimum daily, 0.06 ton (0.05 tonne) several days. WATER-QUALITY DATA, WATER YEARS OCTOBER 1993 TO SEPTEMBER 1994 DIS- CHARGE, SPB- INST. CIPIC CUBIC CON- PH WATER WHOLE FIELD OXYGEN, OXYGEN DIS- DEMAND, SOLVED TEMPER- TOR- OXYGEN, TIME FEET PER DUCT- (STAND- ATURE ANCE ARD WATER SECOND (US/CM) UNITS) (DEG C) BID- ITY (NTU) DIS- (PER- CENT CHEM- ICAL (HIGH COLI- PORM, STREP- FECAL, TOCOCCI 0.45 PECAL, UM-MF (COLS. SOLVED SATUR- LEVEL) (COLS./ OCT 1993 20... DEC 16. . . PBB 1994 10. .. APR 20. .. JUN 28. .. AUG 24... 1005 0905 0930 1130 1045 0930 26 32 15 13 10 9.5 168 144 170 166 180 184 7. 7. 7. 8. 7. 7. 9 3 4 1 8 5 22.5 19.5 20.0 25.0 25.0 24.0 1 6 1 0 2 3 .0 .4 .0 .70 .4 .9 6 6 8 9 9 9 .6 .1 .6 .4 .0 .0 78 68 94 114 110 108 K200 K760 70 K110 590 K100 PER (MG/L) ATION) (MG/L) 100 ML) 100 ML) 320 K1400 110 200 250 380 DATE HARD- NESS CALCIUM TOTAL DIS- (MG/L SOLVED AS (MG/L MAGNE- SIUM, SODIUM, DIS- DIS- SOLVED SOLVED (MG/L OCT 1993 20. .. DEC 16... PEB 1994 10. . . APR 20. . . JUN 28. .. AUG 24. .. K = non-ideal 61 -- -- 64 -- 63 count 15 - - 16 - 16 (MG/L CACO3) AS CA) AS MG) AS NA) SODIUM AD- SORP- TION RATIO ALKA- POTAS- LINITY CHLO- PLUO- SIUM, WAT WH SULPATE RIDE, RIDE, DIS- TOT PET SULPIDE DIS- DIS- DIS- SOLVED PIELD TOTAL SOLVED SOLVED SOLVED (MG/L MG/L AS (MG/L (MG/L (MG/L (MG/L AS K) 5.8 7.3 0.4 2.3 5.9 8.3 0.5 3.0 5.6 8.1 0.4 2.1 CACO3 66 49 62 59 62 66 AS S) AS SO4) AS CL) AS P) <0.5 11 <0.5 14 14 8.1 <0.10 9.2 <0.10 8.4 <0.10 74 RIO GRANDB DE ARECIBO BASIN 50028000 RIO TANAMA NEAR UTUADO, PR--Continued WATER-QUALITY DATA, WATER YEARS OCTOBER 1993 TO SEPTEMBER 1994 DATE OCT 1993 20... DEC 16... FBB 1994 10. . . APR 20. .. JUN 28... AUG 24. .. SILICA, DIS- SOLVED (MG/L AS SI 02) 26 — — 24 — 25 COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 115 -- -- 116 -- 119 IRON, TOTAL RECOV- ERABLE (UG/L AS FE) SOLIDS, DIS- SOLVED (TONS PER DAY) 7.92 -- — 4.03 — 3.05 LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) RESIDUE TOTAL AT 105 DBG. C, SUS- PENDED (MG/L) 7 7 5 4 <1 9 MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS HN) NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) <0.20 <0.20 <0.20 — <0.20 <0.20 MERCURY TOTAL RECOV- ERABLE (UG/L AS HG) PHOS- PHORUS TOTAL (MG/L AS P) 0.030 <0.010 0.020 -- 0.040 <0.010 SELE- NIUM, TOTAL (UG/L AS SB) ARSENIC TOTAL (UG/L AS AS) <1 — — <1 -- -- SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 -- -- 100 -- -- ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) BORON, TOTAL RECOV- ERABLE (UG/L AS B) <10 — — 10 — -- CYANIDE TOTAL (MG/L AS CN) CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 — -- <1 -- -- PHENOLS TOTAL (UG/L) CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) 1 — — <1 — -- MBTHY- LENB BLUB ACTIVE SUB- STANCE (MG/L) OCT 1993 20... DEC 16. .. FBB 1994 10... APR 20. .. JUN 28... AUG 24... 180 130 20 30 <0.10 0.60 10 <0.010 <0.010 <0.02 <0.02 RIO QRANDB DB ARBCXBO BASIN 75 50028000 RIO TANAMA NEAR DTUADO, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN MEAN CONCBN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CFS) (MO/L) (TONS/DAY) OCTOBER 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 30 107 •47 •48 •43 43 35 33 33 32 30 29 28 27 26 30 35 28 26 26 25 25 42 27 26 37 72 70 44 33 30 14 553 61 91 120 55 26 13 14 15 15 15 14 13 13 18 26 13 10 9 10 10 88 23 15 43 150 218 46 22 17 1.1 1080 • 9.0 •19 •17 7.1 2.5 1.2 1.2 1.3 1.2 1.1 .98 .93 .92 1.6 2.7 1.1 .67 .62 .62 .64 40 1.8 1.1 7.8 82 100 6.0 2.0 1.4 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) NOVEMBER 29 28 29 27 44 36 28 34 31 30 30 26 27 33 44 70 55 39 33 31 29 28 27 27 27 26 26 25 37 30 14 10 8 7 60 40 25 30 21 16 22 12 12 23 42 195 81 47 28 15 14 13 12 12 11 8 7 5 45 50 1.0 .78 .72 .54 18 4.5 1.9 3.1 1.8 1.4 2.0 .86 .86 2.2 5.7 122 15 5.1 2.6 1.2 1.0 .93 .88 .88 .76 .60 .48 .36 10 4.5 MEAN MEAN CONCBN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) DECEMBER 26 25 25 25 34 31 25 24 23 23 23 22 52 114 •50 •32 29 31 30 37 29 27 27 26 25 25 24 25 24 24 23 32 14 13 12 37 41 30 23 18 15 12 10 122 597 69 28 16 12 14 52 23 19 16 11 8 12 18 21 17 11 6 2.2 .91 .81 .81 8.3 4.2 2.0 1.4 1.1 .90 .70 .60 55 1170 •11 •2.5 1.3 .90 2.0 7.7 1.8 1.4 1.2 .77 .57 .78 1.2 1.3 1.0 .68 .44 TOTAL 1167 1394.58 986 211.65 960 1285.47 • Estimated 76 RIO GRANDE DE ARECIBO BASIN 50028000 RIO TANAMA NEAR UTUADO, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 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) (MO/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) JANUARY FEBRUARY MARCH 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 23 23 22 22 21 21 20 20 21 20 20 19 19 18 18 18 17 17 17 17 16 45 38 23 19 17 17 16 17 16 16 6 10 12 11 7 5 4 4 5 7 11 12 11 8 7 7 7 6 6 5 4 171 74 33 15 12 11 12 13 13 12 .41 .61 .72 .62 .43 .28 .22 .22 .29 .41 .57 .65 .54 .39 .33 .33 .32 .30 .27 .24 .20 134 9.8 2.5 .82 .57 .49 .50 .54 .56 .48 16 8 .36 16 7 .31 16 7 .30 17 5 .24 17 5 .22 16 5 .22 16 5 .22 16 5 .23 16 6 .25 15 6 .25 15 6 .24 15 6 .23 15 6 .22 15 5 .22 16 5 .21 15 15 14 14 14 14 14 15 15 14 14 14 .18 .16 .16 .16 .16 .16 .16 .16 .16 .16 .16 .16 24 27 6.5 ___ --- ___ --- ___ ___ 22 15 15 15 15 17 18 16 15 15 14 21 26 15 14 14 13 13 12 12 14 13 13 13 12 11 11 10 15 15 12 34 24 16 9 5 4 3 3 3 3 3 18 27 11 11 9 7 6 5 4 3 3 3 3 2 2 2 2 9 20 11 2.5 1.0 .65 .36 .21 .20 .17 .12 .12 .12 .12 4.3 2.9 .45 .40 .34 .27 .23 .17 .14 .13 .10 .10 .10 .08 .06 .06 .06 .61 .94 .36 TOTAL 633 158.61 433 12.16 456 17.37 RIO GRANGE DB ARBCIBO BASIN 77 50028000 RIO TANAMA NEAR UTUADO, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) 1 2 3 4 5 6 ^ 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 18 33 26 16 17 14 13 13 12 12 12 13 12 12 12 11 15 16 14 13 12 13 12 11 12 11 12 15 12 12 APRIL 15 49 22 11 15 14 12 12 11 10 8 6 6 6 6 6 11 5 5 5 5 4 4 3 2 3 7 13 16 ie MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) MAY 1.6 12 2.1 .56 .68 .51 .44 .42 .37 .32 .27 .21 .20 .20 .20 .19 .49 .21 .20 .17 .18 .15 .12 .11 .08 .10 .29 .50 .56 .55 11 10 9.9 12 10 16 13 12 11 15 20 28 20 20 16 39 31 20 16 14 13 12 11 11 11 11 10 15 19 11 11 18 18 18 17 16 20 19 16 15 22 41 46 30 31 22 85 49 40 38 35 30 24 20 19 18 18 18 23 38 37 39 .54 .51 .47 .48 .45 1.2 .78 .52 .44 1.1 2.2 6.3 1.7 1.8 1.1 26 5.0 2.3 1.6 1.3 1.0 .75 .58 .55 .54 .51 .47 1.5 2.2 1.1 1.1 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) JUNE 17 59 38 16 13 12 11 15 12 14 13 11 13 13 24 28 18 15 12 11 10 10 10 10 9.9 9.6 9.5 11 13 10 41 221 62 33 27 21 15 14 18 20 19 18 19 14 29 49 40 38 37 39 42 41 34 25 19 18 17 13 10 10 2.2 114 10 1.5 .99 .71 .47 .68 .64 .80 .75 .54 .66 .55 3.6 4.4 1.9 1.5 1.3 1.1 1.1 1.1 .92 .68 .51 .46 .44 .35 .31 .26 TOTAL 426 23.98 478.9 66.09 468.0 154.42 78 RIO GRANDE DE ARECIBO BASIN 50028000 RIO TANAMA NEAR DTUADO, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) 12 16 19 15 11 11 12 16 11 9.7 9.5 9.4 8.6 7.8 7.5 7.1 7.6 7.3 7.3 7.1 6.9 6.8 6.6 6.5 6.6 6.3 6.4 6.0 6.9 7.1 6.7 JULY 10 12 15 18 18 18 18 18 18 18 17 17 17 17 17 17 17 17 17 17 17 17 17 17 17 16 15 15 15 17 18 TOTAL 284.7 — - YEAR e 7537.6 Estimated .32 .59 .88 .74 .51 .53 .61 .86 .53 .47 .43 .43 .39 .35 .34 .34 .34 .34 .34 .33 .32 .31 .30 .30 .30 .28 .27 .24 .27 .35 .34 12.95 4149.29 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MO/L) (TONS/DAY) AUGUST 6.8 6.3 5.6 5.4 12 11 42 54 55 28 17 13 12 11 13 11 9.7 10 14 12 11 10 9.3 13 14 10 12 21 20 13 12 494.1 18 18 17 18 33 39 123 130 67 38 37 39 41 40 33 25 16 11 11 10 10 10 26 32 34 34 31 39 14 10 10 .33 .30 .25 .26 1.1 1.3 49 54 14 2.8 1.7 1.4 1.3 1.2 1.0 .73 .41 .32 .54 .38 .29 .26 .64 1.1 1.3 .98 1.0 3.4 .95 .35 .36 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) SEPTEMBER 142.95 21 21 15 13 12 11 13 18 13 12 12 13 12 12 11 10 9.9 13 20 17 86 69 47 56 e31 e24 e44 28 51 36 750.9 14 14 26 42 42 42 42 42 40 33 23 17 16 17 18 18 17 13 22 18 437 165 63 80 24 14 100 18 124 59 1.1 1.2 1.0 1.5 1.4 1.4 1.5 2.2 1.5 1.1 .74 .59 .56 .60 .56 .48 .46 .47 2.5 .83 428 70 14 18 »2.3 e.97 e47 1.5 59 6.6 669.06 RIO GRANDE DE ARBCIBO BASIN 79 50028000 RIO TANAHA NEAR OTUADO, PR—Continued WATER QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 PARTICLB-SIZE DISTRIBUTION OP SUSPENDED SEDIMENT DIS- CHARGE, INST. CUBIC FEET PER SECOND SEDI- MENT, SUS- PENDED (MO/L) SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) SED. SUSP. PALL DIAM. PERCENT FINER THAN .002 MM SED. SUSP. FALL DIAM. PERCENT FINER THAN .004 MM SED. SUSP. FALL DIAM. PERCENT FINER THAN .008 MM DATE TIME AUG 1994 07... 1515 164 5780 2560 34 45 €4 20... 0837 19 860 44 88 94 93 SED. SUSP. FALL DIAM. PERCENT FINER THAN .016 MM SED. SUSP. FALL DIAM. PERCENT FINER THAN .031 MM SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .062 MM SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .125 MM SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .250 MM SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .500 MM SED. SUSP. SIEVE DIAM. PERCENT FINER THAN 1.00 MM DATE AUG 1994 07... 81 85 94 96 98 99 99.6 20... 91 93 99.6 99.7 99.7 99.8 100 80 RIO ORANDE DB ARBCIBO BASIN 50028000 RIO TANAMA NEAR OTUADO--Continued WATER QUALITY DATA, HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 SILT AND CLAY PERCENT OF SUSPENDED SEDIMENT DATE OCT 1993 23... 27... OUN 1994 16... ADO 07... SEP 24... TIME 1703 1640 0959 1410 0823 STREAM- PLOW, INSTAN- TANEOUS (CFS) 42 322 22 228 65 SEDI- MENT, SUS- PENDED (MO/L) 51 710 9.0 1400 425 SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) 446 817 151 862 75 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .062 MM 98 98 98 86 98 RIO GRANDB DB ARBCIBO BASIN 50028400 RIO TANAMA AT CHARCO HONDO, PR LOCATION.--Lat 18°24'52", long 66°42'52", Hydrologic Unit 21010002 on right bank at abandoned power house at Charco Hondo, 1.5 mi (2.4 km) upstream from mouth, and 4 mi (6 km) south of Arecibo. DRAINAGE AREA.--57.6 mi 1 (149.2 km1 ). 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 poor. Diversion 0.8 mi (1.3 km) upstream for municipal supply of Arecibo. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES 81 DAY OCT NOV DEC JAN FBB MAR APR MAY JUN JUL ADG 1 71 66 2 176 65 3 12 9 65 4 114 66 5 114 72 6 90 129 7 76 90 8 70 77 9 68 95 10 85 73 11 124 72 12 83 66 13 71 65 14 68 73 15 67 147 16 67 199 17 76 177 18 84 102 19 78 75 20 72 68 21 70 65 22 70 63 23 89 61 24 89 60 25 81 59 26 73 59 27 143 59 28 125 59 29 106 59 30 74 74 31 68 --- TOTAL 2771 2460 MEAN 89.4 82.0 MAX 176 199 MIN 67 59 AC-FT 5500 4880 CFSM 1.55 1.42 IN. 1.79 1.59 STATISTICS OF MONTHLY MEAN MEAN 165 141 MAX 335 260 (WY) 1990 1982 MIN 72.1 71.5 (WY) 1983 1988 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN- DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE ANNUAL RUNOFF (AC-FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 59 59 58 58 58 72 68 72 68 60 62 69 80 163 124 83 e70 e65 e62 e60 54 53 52 52 52 52 51 51 50 e50 e48 2035 65.6 163 48 4040 1.14 1.31 DATA 82.0 219 1982 36.4 1989 FOR e48 e48 e47 e47 e47 e46 e46 e47 e45 e45 e44 54 58 59 56 e45 e43 56 63 e52 e45 e60 107 69 e42 e39 e39 e38 e38 e39 e36 1548 49.9 107 36 3070 .87 1.00 FOR WATER 55.3 90.8 1982 22.3 1989 e36 e36 e35 e36 e36 e34 e34 e34 e33 e33 e32 32 31 32 35 33 31 31 31 30 33 31 30 32 31 30 31 30 ___ ___ --- 913 32.6 36 30 1810 .57 .59 YEARS 1969 45.8 85.1 1971 16.7 1989 56 33 30 29 29 31 36 30 29 30 32 29 47 28 26 24 25 e32 e28 e26 e28 23 24 23 23 22 25 25 22 31 28 904 29.2 56 22 1790 .51 .58 - 1994 39.9 70.0 1971 16.6 1988 1993 CALENDAR YEAR 29353 80. 540 34 35 58220 1. 18. 136 68 40 4 Sep 6 Jul 30 Jul 29 40 96 24 41 64 34 36 31 29 27 27 28 27 28 27 27 28 28 31 34 31 30 28 29 29 29 31 29 32 43 42 30 --- 954 31.8 64 24 1890 .55 .62 28 27 27 28 27 28 40 31 29 32 41 49 62 62 57 75 105 96 48 36 31 26 25 24 25 23 23 22 38 27 24 1216 39.2 105 22 2410 .68 .79 24 60 122 46 32 27 e22 e21 38 30 36 30 25 28 34 59 45 e35 e30 e27 25 26 25 25 25 25 25 24 28 27 1026 34.2 122 21 2040 .59 .66 26 29 53 41 30 28 31 39 31 29 27 29 27 26 26 28 30 25 24 23 22 22 21 21 21 21 20 21 22 24 23 840 27.1 53 20 1670 .47 .54 29 26 22 21 23 31 50 82 125 71 45 35 31 28 25 25 24 23 28 42 28 25 24 25 31 26 25 24 45 27 23 1089 35.1 125 21 2160 .61 .70 26 34 35 24 24 24 24 30 27 25 24 24 33 25 24 24 23 24 25 38 107 125 109 78 58 44 58 62 54 116 1348 44.9 125 23 2670 .78 .87 , BY WATER YEAR (WY) 70.2 141 1986 25.9 1989 FOR 1994 17104 46. 199 20 21 1060 8, 33930 11 79 34 24 133 371 1986 15.8 1989 WATER YEAR ,9 Nov 16 Jul 27 Jul 22 Oct 2 .49 Oct 2 .81 .05 88.0 179 1970 23.3 1989 65.2 120 1969 22.0 1989 WATER 88 124 51 2500 4 5 15000 17 64340 1 20 174 64 27 72.1 125 1991 35.1 1994 YEARS 1969 - .8 .3 Oct 7 .2 May 28 .4 May 22 May 18 .95 May 18 .54 .95 111 216 1984 44.9 1994 1994 1986 1989 1985 1989 1989 1985 1985 e Estimated 82 RIO GRANDB DB ARBCIBO BASIN 50029000 RIO GRANDB DB ARBCIBO AT CENTRAL CAMBALACHB, 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 m) upstream from Central Cambalache, near Highway 2, 8.3 mi (13.4 km) downstream from Dos Bocas Reservoir, 1.9 mi (3.1 km) downstream from Rio Tanarn* , and 1.6 mi (2.6 km) southeast of Arecibo. DRAINAGE ARBA.--200 mi» (520 km 1 ), approximately. PERIOD OF RECORD.—Water years 1963-66, 1969 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE OCT 1993 26. .. DEC 17. .. PBB 1994 14. . . APR 06. .. JUL 08. .. AUG 17. .. DATE OCT 1993 26. . . DEC 17. .. FEE 1994 14. .. APR 06. .. JUL 08. . . AUG 17. .. DATE OCT 1993 26. . . DEC 17. .. PBB 1994 14. .. APR 06. .. JUL 08. .. AUG 17. .. TIME 0855 0820 0825 0900 1115 1025 HARD- NESS TOTAL (MG/L AS CAC03 ) 120 -- -- _- -- 120 SILICA, DIS- SOLVED (MG/L AS SIO2) 19 -- -- — -- 16 DIS- CHARGE, INST. CUBIC FEET PER SECOND 167 145 70 72 90 93 CALCIUM DIS- SOLVED (MG/L AS CA) 38 -- -- -- -- 36 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 161 -- -- -- -- 161 SPE- CIFIC CON- DUCT- ANCE (US/CM) 260 268 275 265 254 267 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 5.8 -- -- — -- 6.7 SOLIDS, DIS- SOLVED (TONS PER DAY) 72.4 -- -- — -- 40.5 PH WATER WHOLE FIELD (STAND- ARD UNITS) 7.5 7.6 7.7 7.9 8.7 7.7 SODIUM, DIS- SOLVED (MG/L AS NA) 9.6 -- -- -_ -- 11 RESIDUE TOTAL AT 105 DEG. C, SUS- PENDED (MG/L) 4 17 2 -- 6 4 TEMPER- ATURE WATER (DBG C) 26.0 24.5 24.0 25.0 28.0 29.0 SODIUM AD- SORP- TION RATIO 0.4 -- -- __ -- 0.4 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.60 <0.20 <0.20 <0.20 <0.20 <0.20 TUR- BID- ITY (NTU) 3.6 9.0 1.4 -- 1.0 1.5 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 2.4 -- -- __ -- 1.8 PHOS- PHORUS TOTAL (MG/L AS P) 0.030 <0.010 0.030 0.020 0.040 0.010 OXYGEN, DIS- SOLVED (MG/L) 6.2 4.0 5.4 8.0 9.0 8.4 ALKA- LINITY WAT WH TOT FET FIELD MG/L AS CACO3 110 110 120 110 110 110 ARSENIC TOTAL (UG/L AS AS) <1 — -- <1 -- — OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 75 47 63 97 114 109 SULFIDB TOTAL (MG/L AS S) <0.5 -- -- <0.5 -- -- BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 -- -- <100 -- -- OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 13 <10 <10 -- <10 10 SULFATB DIS- SOLVED (MG/L AS S04) 10 -- -- _- -- 12 BORON, TOTAL RECOV- ERABLE (UG/L AS B) 10 -- -- 20 -- -- COLI- FORM, FECAL, 0.45 UM-MF (COLS./ 100 ML) 550 K1600 270 240 K150 230 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 9.7 -- -- _- -- 11 CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- <1 -- -- STREP- TOCOCCI FECAL, (COLS. PER 100 ML) 460 K1700 140 K130 K82 K170 FLUO- RIDB, DIS- SOLVED (MG/L AS F) 0.10 -- — __ -- 0.20 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) <1 -- -- <1 -- — K = non-ideal count RIO ORANDE DE ARBCIBO BASIN 50029000 RIO ORANDE DE ARECIBO AT CENTRAL CAMBALACHE, PR--Continued WATER-QOALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 83 COPPER, IRON, TOTAL TOTAL RBCOV- RECOV- ERABLE ERABLB DATE OCT 1993 26... DEC 17... FEB 1994 14... APR 06... JUL 08... ADO 17. .. (DG/L (UG/L LEAD, TOTAL RECOV- ERABLE (UG/L MANGA- NESE, MERCURY TOTAL TOTAL RECOV- ERABLE RECOV- ERABLE (DG/L (DO/L SELE- NIUM, TOTAL (UG/L SILVER, TOTAL RECOV- ERABLE (UG/L ZINC, TOTAL RECOV- CYANIDE ERABLE TOTAL (UG/L (MG/L MBTHY- LENB BLUE ACTIVE PHENOLS SUB- TOTAL AS CU) AS PB) AS PB) AS MN) AS HG) AS SB) AS AG) AS ZN) AS CN) (UG/L) 250 350 30 20 <0.10 <0.10 10 <0.010 <0.010 STANCE (MG/L) <0.02 4 <0.02 84 THIS PAGE WAS LEFT BLANK INTENTIONALLY 85 Ision-a di»-id« Rib inoec"« SCfcif / ,—Mop area -i,^.,-...____ . *&» JU*« .> (UATAH* EXPLANATION AOSSO SURFACE-WATER STATION AND NUMBER TOSO? QUALITY-OF-WATER STATION AND NUMBER • 210 WELL AND WELL NUMBER B032290 LAKE-ELEVATION STATION 0 1 2 3 4 „ . j__LJ__,.,_L_J__I 0 1234 MILES Figure 16.--Rio Grande de Manati basin. RIO GRANDB DB 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, 2.1 mi (3.38 km) upstream from Rio Botijas, and 250 ft (76 m) upstream from bridge on Highway 599. DRAINAGE AREA.--5.03 mi* (13.03 km» ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--April 1981 to September 1982, October 1988 to current year. GAGE.—Water-stage recorder. Elevation of gage is 500 ft (152 m), from topographic map. REMARKS.--Records poor. Low flow affected by diversions for water supply. Gage-height and precipitation satellite telemetry at station. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY OCT NOV 1 .87 2.1 2 .78 1.8 3 .80 1.8 4 .83 1.9 5 .87 1.9 6 .93 2.0 7 1.0 2.5 8 .95 1.7 9 .97 2.2 10 1.2 2.2 11 .75 1.5 12 .75 1.7 13 .78 2.0 14 .87 2.9 15 .87 18 16 1.2 31 17 7.3 6.2 18 4.1 3.0 19 .84 4.2 20 .75 1.9 21 .72 1.7 22 .77 1.9 23 .78 1.6 24 .78 1.5 25 .73 1.3 26 .70 1.4 27 3.6 1.7 28 11 1.5 29 9.7 1.5 30 2.0 1.8 31 2.2 —— TOTAL 60.39 108.4 MEAN 1.95 3.61 MAX 11 31 MIN .70 1.3 AC- FT 120 215 CFSM .39 .72 IN. .45 .80 DEC 1.6 1.4 1.2 1.2 1.1 1.1 .97 .94 .98 1.2 1.3 1.1 1.2 2.0 3.0 1.1 1.1 1.4 1.3 el. 2 el.l el.l el.l el.l el.l el.l el. 3 el. 5 el. 5 el. 4 el. 4 40.09 1.29 3.0 .94 80 .26 .30 STATISTICS OF MONTHLY MEAN DATA MEAN 19.9 7.11 MAX 58.0 15.2 (WY) 1990 1991 MIN 1.95 2.19 (WY) 1994 1992 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN-DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE ANNUAL RUNOFF (AC- FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 5.83 15.8 1982 1.29 1994 FOR JAN el. 5 el. 4 el. 3 el. 4 1.9 1.8 1.5 1.2 1.3 1.4 2.1 2.2 1.5 1.7 2.9 3.4 2.4 2.0 1.7 1.8 1.7 1.8 1.8 1.7 1.6 1.5 1.5 1.7 1.7 1.6 1.6 54.6 1.76 3.4 1.2 108 .35 .40 FBB 1.5 1.5 1.5 1.5 1.4 1.4 1.4 2.0 1.9 1.9 1.7 1.4 1.6 1.5 1.3 1.3 1.4 1.4 1.4 1.6 1.5 1.4 1.4 1.3 1.3 1.2 2.0 1.8 ___ ___ —— 42.5 1.52 2.0 1.2 84 .30 .31 FOR WATER YEARS 1981 7.02 34.3 1992 1.47 1989 2.26 2.97 1992 1.52 1994 MAR 1.3 1.5 1.2 1.1 1.1 1.0 1.1 .96 .86 1.2 .81 .75 .79 .80 .71 .69 .97 1.0 .83 .83 .74 .74 .83 .78 .78 .74 .74 .69 .69 .83 .83 27.89 .90 1.5 .69 55 .18 .21 - 1994 1.72 2.46 1990 .90 1994 1993 CALENDAR YEAR 2134.98 5.85 229 .60 .70 4230 1.16 15.79 9.7 1.8 .89 Apr 29 Jan 26 Feb 7 APR .83 .83 .89 .89 .89 1.0 1.0 1.0 1.1 1.1 1.7 2.3 1.0 1.2 2.8 2.9 1.4 1.2 .96 .94 .94 .94 .94 .94 .94 5.8 8.1 1.6 1.3 1.2 --- 48.63 1.62 8.1 .83 96 .32 .36 , BY WATER 6.43 21.0 1993 1.32 1982 FOR 1994 545 1 31 79 6 1080 MAY 1.1 1.2 1.2 1.2 1.5 1.3 1.1 1.1 1.2 1.1 1.1 1.1 1.1 1.8 10 1.5 1.2 1.3 1.3 1.2 1.2 1.1 1.2 1.1 1.0 1.0 1.1 .96 .95 .95 .89 45.05 1.45 10 .89 89 .29 .33 YEAR (WY) 12.9 31.8 1981 1.42 1989 JUN .92 .94 .88 .88 .91 .87 .87 .88 .84 .83 .84 .83 .86 .84 .80 .82 .91 .89 .87 .89 .86 .88 .87 .86 .84 1.0 .92 .88 .89 .99 26.36 .88 1.0 .80 52 .17 .19 4.87 15.2 1992 .88 1994 WATER YEAR .14 .49 .69 .75 .04 Nov 16 Mar 16 Oct 20 Nov 16 Nov 16 .30 4 2 1 .03 .0 .1 .79 JUL 1.0 .94 .88 .90 .89 .92 .95 .89 .85 .87 .83 .79 .78 .77 .73 .73 .74 .81 .88 .88 .88 .88 .86 .87 .88 .90 .92 .93 .95 .96 1.1 27.16 .88 1.1 .73 54 .17 .20 3.40 8.40 1991 .88 1994 AUG 1.2 1.2 1.2 1.2 1.2 1.2 4.4 2.2 1.3 1.2 1.2 1.1 1.0 1.0 1,1 .99 .96 1.2 1.2 1.1 1.1 1.0 .99 .98 1.0 .94 .92 .93 .89 .87 .87 37.64 1.21 4.4 .87 75 .24 .28 4.07 12.3 1989 1.03 1982 WATER YEARS 1981 6.92 9.35 1.49 420 .20 .33 2320 11.53 5010 1.38 18.69 12 1.9 .95 Sep Oct Oct Jan Jan SEP .88 1.1 1.1 .98 .90 .98 1.1 .97 .91 .88 .93 .86 .79 .75 .69 .74 .78 .79 .80 1.2 .98 .89 .83 .83 .81 .82 .81 .79 .78 .76 26.43 .88 1.2 .69 52 .18 .20 10.8 39.6 1989 .88 1994 - 1994 1992 1994 18 1989 4 1992 11 1992 5 1992 5 1992 e Estimated RIO GRANDE DE MANATI BASIN 3 7 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 mi' (26.2 km*). PERIOD OF RECORD.--Water year 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE OCT 1993 14. .. DEC 02. .. FBB 1994 03... APR 14. .. JON 20... ADG 09... DATE OCT 1993 14. .. DEC 02. .. FEB 1994 03. . . APR 14. .. JON 20. .. ADG 09. .. DATE OCT 1993 14. .. DEC 02. .. FEB 1994 03. .. APR 14... JON 20. .. ADG 09. . . K = non-ide: TIME 0935 1040 0810 1310 1530 1200 HARD- NESS TOTAL (MG/L AS CACO3 ) 140 -- — -- -- 140 SILICA, DIS- SOLVED (MG/L AS SIO2) 35 -- -- -- -- 31 »1 count DIS- CHARGE, INST. CUBIC FEET PER SECOND 7.3 7.2 4.0 3.8 2.6 2.2 CALCIUM DIS- SOLVED (MG/L AS CA) 35 -- -- -- -- 38 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 213 -- -- -- -- 214 SPE- CIFIC CON- DUCT- ANCE (US/CM) 322 337 350 328 352 357 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 13 -- -- -- -- 12 SOLIDS, DIS- SOLVED (TONS PER DAY) 4.17 — -- -- -- 1.30 PH WATER WHOLE FIELD (STAND- ARD UNITS) 8.2 7.9 8.0 8.1 8.2 8.1 SODIUM, DIS- SOLVED (MG/L AS NA) 13 -- -- -- -- 15 RESIDUE TOTAL AT 105 DBG. C, SUS- PENDED (MG/L) 8 28 6 -- 3 6 TEMPER- ATURE WATER (DBG C) 23.0 21.5 19.5 23.0 28.0 24.0 SODIUM AD- SORP- TION RATIO 0.5 — -- — -- 0.5 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.30 <0.20 <0.20 — <0.20 -- TUR- BID- ITY (NTU) 1.3 18 1.5 -- 1.1 2.6 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 1.6 -- -- -- -- 1.5 PHOS- PHORUS TOTAL (MG/L AS P) 0.180 0.200 0.200 -- 0.290 -- OXYGEN, DIS- SOLVED (MG/L) 7.2 4.3 2.9 9.4 6.4 7.8 ALKA- LINITY WAT WH TOT FET FIELD MG/L AS CACO3 150 140 150 140 160 140 ARSENIC TOTAL (UG/L AS AS) <1 -- -- <1 -- — OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 86 50 32 115 86 97 SULFIDB TOTAL (MG/L AS S) <0.5 -- -- <0.5 -- " BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) 100 -- -- <100 -- -- OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) <10 11 <10 — <10 17 SDLFATE DIS- SOLVED (MG/L AS SO4) 9.8 -- -- -- -- 14 BORON, TOTAL RECOV- ERABLE (DG/L AS B) 30 -- -- 30 -- — COLI- FORM, FECAL, 0.45 UM-MF (COLS./ 100 ML) K770 200 570 530 250 480 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 15 -- -- -- -- 19 CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- <1 -- -- STREP- TOCOCCI FECAL, (COLS. PER 100 ML) 660 560 160 870 K120 570 FLUO- RIDB, DIS- SOLVED (MG/L AS F) 0.20 -- -- -- -- <0.10 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) <1 -- -- <1 -- — 88 RIO GRANDB DB MANATI BASIN 50030700 RIO OROCOVIS NEAR OROCOVIS, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE COPPER, TOTAL RECOV- ERABLE (UG/L IRON, TOTAL RECOV- ERABLE (UG/L LEAD, TOTAL RECOV- ERABLE (UG/L MANGA- NESE, TOTAL RECOV- ERABLE (UG/L MERCURY TOTAL RECOV- ERABLE (UG/L SELE- NIUM, TOTAL (UG/L SILVER, TOTAL RECOV- ERABLE (UG/L ZINC, TOTAL RECOV- ERABLE (UG/L CYANIDE TOTAL (MG/L PHENOLS TOTAL METHY- LENE BLUB ACTIVE SUB- STANCE AS CU) AS FE) AS PB) AS MN) AS HG) AS SB) AS AG) AS ZN) AS CN) (UG/L) OCT 1993 14. .. DEC 02. .. PBB 1994 03. .. APR 14. . . JUN 20. .. AUG 09. . . 190 150 20 30 0.10 <0.10 10 <0.010 <0.010 (MG/L) 0.02 0.05 RIO GRANDB DB MANATI BASIN 89 50031200 RIO GRANDB DB MANATI NEAR MOROVIS, PR LOCATION.--Lat 18°17'45", long 66°24'47", Hydrologic Unit 21010001, on right bank , 0.1 mi (0.2 km) downstream from Quebrada Perchas, 0.8 mi (1.3 km) upstream from Rio Sana Muerto, and 2.2 mi (3.5 km) south of Morevis. DRAINAGE AREA.--55.2 mi 1 (143.0 km1 ). 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 poor. Public water-supply pumpage, about 300 ft (91 m) above the station, influences low-flow discharges. Gage-height and precipitation satellite telemetry at station. DISCHARGE, COB1C FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES OCT NOV JAN FEB MAR APR MAY JUN AUG SEP 1 79 41 2 54 40 3 50 39 4 52 38 5 48 62 6 44 67 7 48 40 8 45 43 9 40 54 10 39 51 11 40 42 12 39 41 13 40 46 14 35 137 15 34 255 16 38 284 17 100 188 18 101 151 19 47 180 20 41 115 21 38 87 22 38 74 23 38 66 24 35 57 25 35 53 26 33 50 27 45 50 28 137 48 29 127 49 30 56 44 31 45 --- TOTAL 1641 2492 MEAN 52 . 9 83 . 1 MAX 137 284 MIN 33 38 AC-FT 3250 4940 CFSM .96 1.50 IN. 1.11 1.68 STATISTICS OF MONTHLY MEAN MEAN 161 152 MAX 1037 491 (WY) 1971 1971 MIN 24.0 28.3 (WY) 1978 1974 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN-DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE INSTANTANEOUS LOW FLOW ANNUAL RUNOFF (AC- FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 32 36 36 35 38 35 32 30 29 31 30 26 28 32 45 31 29 35 37 32 30 30 28 24 25 24 28 33 32 30 28 971 31.3 45 24 1930 .57 .65 DATA 114 522 1966 27.9 1984 FOR 29 33 30 28 29 28 28 27 26 27 33 40 34 30 29 29 30 38 31 38 39 33 34 33 32 31 28 26 27 25 21 946 30.5 40 21 1880 .55 .64 18 17 15 15 18 15 14 13 12 12 12 11 11 11 13 12 11 9.9 e9.7 e9.7 elO 9.7 10 10 11 9.9 e22 86 -__ -__ 427.9 15.3 86 9.7 849 .28 .29 FOR WATER YEARS 1965 81.6 191 1992 24.7 1984 64.3 179 1969 15.3 1994 25 25 20 16 16 16 15 13 12 12 12 12 13 12 12 12 12 11 10 10 9.8 10 9.9 9.8 9.9 9.5 10 9.8 11 10 10 395.7 12.8 25 9.5 785 .23 .27 - 1994 67.2 226 1972 12.7 1984 1993 CALENDAR YEAR 30660 84. 949 18 19 60810 1, 20, 174 52 31 .0 Apr 29 Apr 6 Apr 1 .52 ,66 9.7 11 8.7 8.8 e!2 18 12 12 11 9.9 14 53 26 e!7 27 27 19 18 14 11 10 9.9 9.6 8.7 8.5 15 108 35 20 16 579.8 19.3 108 8.5 1150 .35 .39 13 13 12 12 13 14 14 14 13 14 23 19 15 15 18 26 e61 26 20 15 13 12 11 11 11 10 11 10 10 9.4 8.7 487.1 15.7 61 8.7 966 .28 .33 8.6 8.2 7.7 7.7 e7.6 e7.6 7.6 7.0 e6.8 6.4 6.6 6.9 6.7 6.1 6.2 7.3 7.2 e9.4 e7.2 7.4 5.8 5.1 5.2 5.3 5.4 5.7 7.2 5.9 5.4 5.2 202.4 6.75 9.4 5.1 401 .12 .14 8.4 7.0 6.0 6.2 6.2 8.4 9.3 7.1 6.1 6.3 5.3 5.1 5.1 4.9 4.7 4.8 5.1 5.2 7.1 6.2 5.0 4.3 3.9 3.9 4.0 3.8 3.8 4.1 4.9 4.6 5.0 171.8 5.54 9.3 3.8 341 .10 .12 6.2 5.9 5.1 4.3 4.1 4.3 9.9 41 20 13 10 8.5 7.7 7.1 7.2 6.8 5.5 8.0 17 14 13 12 10 8.8 8.6 8.3 7.4 7.7 7.8 6.7 5.8 301.7 9.73 41 4.1 598 .18 .20 8.8 7.9 6.6 6.9 5.3 5.2 8.4 8.7 6.1 6.4 6.5 8.5 6.8 5.2 4.8 5.3 5.6 5.5 4.4 7.6 17 9.1 6.2 7.3 6.3 9.0 6.8 5.0 4.7 4.2 206.1 6.87 17 4.2 409 .12 . 14 , BY WATER YEAR (WY) 113 412 1969 10.6 1984 FOR 1994 8822 24 284 3 4 606 2 17500 5 46 13 5 165 915 1985 15.7 1994 WATER YEAR .5 .2 Nov 16 .8 Jul 26 .0 Jul 22 Oct 28 .19 Oct 28 .44 .95 .4 63.6 173 1987 6.75 1994 47.7 157 1979 5.54 1994 WATER 98 248 24 17100 3 4 48000 17 4 71670 1 24 174 50 23 57.2 435 1979 9,70 1984 YEARS 1965 .9 .2 May .8 Jul .0 Jul May .89 May .4 Apr .79 .35 90.5 386 1979 6.87 1994 - 1994 1971 1994 18 1985 26 1994 22 1994 18 1985 18 1985 15 1984 e Estimated 90 PERIOD RIO GRANDB DE MANATI BASIN 50031200 RIO GRANDB DE MANATI NEAR MOROVIS, PR--Continued WATER-QUALITY RECORDS OF RECORD.--Water years 1968 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 OCT 14 DEC 02 FEE 03 APR 28 JUN 22 AUG 09 OCT 14 DEC 02 FEB 03 APR 28 JUN 22 AUG 09 OCT 14 DEC 02 FBB 03 APR 28 JUN 22 AUG 09 DATE 1993 . . . 1994 ... . . . DATE 1993 1994 DATE 1993 . . . 1994 TIME 1235 0910 1020 1045 1305 1005 HARD- NESS TOTAL (MG/L AS CAC03) 120 -- -- 99 -- 120 SILICA, DIS- SOLVED (MG/L AS SI 02) 28 -- -- 21 -- 28 DIS- CHARGE, INST. CUBIC FEET PER SECOND 37 35 15 33 5.3 13 CALCIUM DIS- SOLVED (MG/L AS CA) 27 -- -- 25 -- 28 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 175 -- -- 146 -- 183 SPE- CIFIC CON- DUCT- ANCE (US/CM) 282 289 297 230 299 297 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 12 -- -- 8.8 -- 11 SOLIDS, DIS- SOLVED (TONS PER DAY) 17.6 -- -- 13.0 -- 6.54 PH WATER WHOLE FIELD (STAND- ARD UNITS) 8.4 7.9 8.0 7.5 8.0 7.9 SODIUM, DIS- SOLVED (MG/L AS NA) 12 -- -- 12 -- 14 RESIDUE TOTAL AT 105 DBG. C, SUS- PENDED (MG/L) 12 13 5 116 15 18 TEMPER- ATURE WATER (DBG C) 28.0 22.5 22.0 24.0 31.0 25.5 SODIUM AD- SORP- TION RATIO 0.5 -- -- 0.5 -- 0.6 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.40 <0.20 <0.20 — 0.30 — TUR- BID- ITY (NTU) 2.9 5.1 1.2 80 2.6 5.2 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 2.2 -- -- 3.2 -- 2.5 PHOS- PHORUS TOTAL (MG/L AS P) 0.070 0.050 0.060 -- 0.060 -- OXYGEN, DIS- SOLVED (MG/L) 4.6 4.9 4.0 7.2 8.8 8.0 ALKA- LINITY WAT WH TOT FBT FIELD MG/L AS CACO3 120 120 120 82 130 120 ARSENIC TOTAL (UG/L AS AS) <1 -- -- <1 -- — OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 58 56 46 86 117 98 SULFIDE TOTAL (MG/L AS S) <0.5 -- -- <0.5 -- - - BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 -- -- 100 -- -- OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) <10 <10 <10 16 <10 15 SULFATE DIS- SOLVED (MG/L AS SO4) 8.0 -- -- 12 -- 10 BORON, TOTAL RECOV- ERABLE (UG/L AS B) 30 -- -- 30 -- — COLI- FORM, FECAL, 0.45 UM-MF (COLS./ 100 ML) K73 K190 100 K96 K140 560 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 14 -- -- 15 -- 18 CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- <1 -- -- STREP- TOCOCCI FECAL, (COLS. PER 100 ML) 260 230 91 5800 K140 420 FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.20 — -- 0.10 -- <0.10 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) <1 -- -- 8 -- -- K = non-ideal count RIO GRANDB DB MANATI BASIN 50031200 RIO GRANDB DB MANATI NEAR MOROVIS, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 91 DATE OCT 1993 14. .. DEC 02. .. FBB 1994 03... APR 28. .. JUN 22... AUG 09... COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) <10 -- -- 20 -- -- IRON, TOTAL RECOV- ERABLE (UG/L AS FB) 370 -- -- 5200 -- -- LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) 2 -- -- 3 -- — MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) 30 -- -- 150 -- -- MERCURY TOTAL RECOV- ERABLE (UG/L AS HG) <0.10 — -- <0.10 — — SELE- NIUM, TOTAL (UG/L AS SB) <1 -- -- <1 -- -- SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) <1 — -- <1 — -- ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) <10 -- -- 20 -- -- CYANIDE TOTAL PHENOLS (MG/L TOTAL AS CN) (UG/L) <0.010 <1 — __ <0.010 <1 — — MBTHY- LBNB BLUB ACTIVE SUB- STANCE (MG/L) <0.02 -- -- <0.02 -- — 92 RIO GRANDB DE MANATI BASIN 50032290 LAQO EL GDINBO AT DAMSITE, PR LOCATION.--Lat 18°09'41", long 66°31'36", 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 Haravillas. The reservoir itself fixes the territorial limits between the Municipality of Ciales and orocovie. DRAINAGE AREA.--1.64 mi* (4.25 km 1 ). PERIOD OF RECORD.--May 1988 to current year. ELEVATION RECORDS GAGE.--Water-stage recorder. Datum of gage is mean sea level. REMARKS.--Lago Guineo was completed in 1931. It provides a maximum storage of approximately 2,180 ac-ft (2.688 hm3 ) for power and irrigation. Waters are discharged through an outlet power tunnel into the Rio Toro Negro and coveyed to the head water works of Toro Negro Hydroelectric Plant No.2, for energy generation at Toro Negro Hydroelectric plant No.l, and are discharged into the Guayabal Reservoir to be later used for irrigation at South Coast Irrigation System. The dam is rockfill with a vertical concrete corewall, rock toes, and riprap facing of upstream slope, with a total length of 565 ft (172 m), a maximum structural height of 125 ft (38 m) to top of corewall. At a maximum reservoir water surface elevation the uncontrolled morning-glory tunnel spillway crest has an elevation of 2,966 ft (904 m) above mean sea level and a design capacity of 7,000 ft'/s. The dam is owned by Puerto Rico Electric Power Authority. Gage-height and precipitation satellite telemetry at station. EXTREMES OBSERVED FOR PERIOD OF RECORD.--Maximum elevation 2,961.70 ft (902.73 m), Oct. 21, 1990; minimun elevation, 2,919.79 ft (899.95 m), May 27, 1988. EXTREMES OBSERVED FOR CURRENT YEAR.--Maximum elevation, 2,954.48 ft (900.52 m), Dec. 15; minimun elevation, 2,926.00 ft (891.84 m). May 27. DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN MAX MIN Capacity Table (based on data from Puerto Rico Electric Power Authority) Elevation, in feet 2,872 2,919 2,925 Contents, in acre-feet 0 361 491 Elevation, in feet 2,943 2,950 2,961 Contents, in acre-feet 1,029 1,308 1,852 ELEVATION (FEET NGVD), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY OBSERVATION AT 24:00 VALUES OCT NOV JAN FEB APR MAY JUN J0L AUG A A A A 2947.87 2948.17 2948.51 2948.73 2948.93 2948.13 2949.30 2949.48 2949.66 2949.80 2949.95 2950.42 2950.71 2950.90 2951.06 2951.20 2951.33 2951.45 2951.64 2951.92 2952.07 2952.20 2952.41 2952.48 2952.41 2952.53 2952.64 ___ ___ ___ 2952.75 2952.90 2952.99 2953.09 2952.84 2952.94 2953.03 2952.79 2952.61 2952.45 2952.54 2952.40 2952.52 2952.59 2952.45 2952.60 2952.69 2952.85 2952.93 2953.13 2953.23 2953.17 2953.07 2952.91 2952.98 2953.05 2952.61 2952.70 2952.77 2952.85 2952.81 2953.23 2952.40 2952.90 2952.95 2953.01 2953.07 2953.12 2952.76 2952.82 2952.88 2952.92 2952.97 2953.02 2953.07 2954.31 2954.45 2954.39 2954.45 2954.16 2954.22 2954.28 2953.90 2953.64 2953.82 2953.88 2953.94 2953.98 2954.03 2953.66 2953.54 2953.24 2952.75 2952.80 2953.51 2954.45 2952.75 2952.85 2952.89 2952.58 2952.30 2952.10 2952.13 2951.82 2951.84 2951.89 2951.91 2951.98 2952.02 2952.06 2951.39 2950.52 2950.37 2950.41 2950.43 2950.20 2950.09 2950.14 2950.18 2950.28 2950.33 2950.36 2950.38 2950.41 2950.43 2950.45 2950.47 2950.48 2951.15 2952.89 2950.09 2950.51 2950.37 2950.23 2950.25 2950.27 2950.28 2950.30 2950.12 2949.83 2949.84 2949.60 2949.61 2949.62 2949.49 2948.97 2948.74 2948.46 2948.29 2948.39 2948.43 2948.45 2948.25 2948.07 2948.08 2948.10 2948.11 2948.13 2948.43 ___ ___ --- 2949.19 2950.51 2948.07 2948.54 2948.58 2948.60 2948.18 2948.21 2948.23 2948.24 2947.92 2947.63 2947.36 2947.08 2947.28 2947.32 2947.15 2946.84 2946.62 2946.32 2945.99 2946.00 2946.01 2945.80 2945.81 2945.47 2945.35 2944.84 2944.84 2944.85 2944.67 2944.49 2944.50 2944.49 2946.55 2948.60 2944.49 2944.51 2944.52 2944.52 2944.20 2944.07 2943.92 2943.80 2943.70 2943.71 2943.71 2943.62 2943.40 2943.29 2943.13 2943.16 2943.16 2943.18 2943.20 2943.01 2943.03 2942.53 2941.97 2941.07 2941.26 2940.55 2939.85 2939.32 2938.54 2937.72 2937.73 --- 2942.45 2944.52 2937.72 2937.75 2936.83 2935.90 2935.20 2934.38 2934.35 2934.51 2934.56 2933.91 2933.14 2932.75 2931.60 2930.38 2931.51 2931.74 2931.46 2931.38 2931.46 2931.32 2930.86 2930.22 2930.27 2929.47 2927.99 2928.03 2928.07 2926.58 2926.63 2926.70 2926.73 2926.76 2931.37 2937.75 2926.58 2926 2932 2932 2932 2932 2932 2932 2932 2932 2933 2933 2933 2933 2933 2933 2933 2933 2933 2933 2933 2933 2933 2933 2933 2933 2933 2932 2932 2932 2932 2932 2933 2926 .70 .20 .50 .60 .70 .70 .80 .90 .90 .00 .00 .10 .10 .10 .20 .20 .30 .30 .40 .40 .40 .40 .20 .10 .15 .17 .90 .52 .42 .19 --- .75 .40 .70 2931. 2931. 2931. 2931. 2931. 2931. 2931. 2930. 2930. 2930. 2930. 2930. 2929. 2929. 2929. 2929. 2929. 2929. 2929. 2929. 2929. 2929. 2929. 2929. 2929. 2929. 2929. 2929. 2929. 2929. 2929. 2930. 2931. 2929. 92 93 94 95 69 39 07 84 85 85 59 10 80 80 80 80 80 90 90 90 90 50 50 50 50 50 50 50 50 50 40 28 95 40 2929.50 2929.50 2929.50 2929.40 2929.40 2929.40 2929.50 2930.00 2930.00 2930.00 2929.90 2929.90 2929.90 2930.00 2930.00 2930.00 2930.00 2930.00 2930.00 2930.00 2930.00 2930.00 2930.00 2929.80 2929.90 2930.00 2930.00 2930.80 2931.90 2931.90 2931.90 2930.07 2931.90 2929.40 2931.90 2931.90 2931.90 2931.90 2931.90 2931.90 2931.60 2931.60 2931.60 2931.60 2931.70 2931.70 2931.70 2931.70 2931.70 2931.70 2931.80 2931.88 2931.97 2932.71 2933.21 2933.31 2933.36 2934.52 2934.75 2934.85 2934.92 2934.97 2935.04 2936.30 2932.72 2936.30 2931.60 A No gage-height record RIO GRANDB DB MANATI BASIN 50032590 LAGO DB MATRULLAS AT DAHSITB, PR 93 LOCATION. --Lat 18°12'46", long 66°28'50 H , Hydrologic Unit 21010001, in concrete house at damsite, and 5.8 mi (9.3 km) southwest of Orocovis. DRAINAGE AREA. --4. 46 mi 1 (11.55 km1 ). PERIOD OF RECORD. — May 1988 to current year. ELEVATION RECORDS 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 ( 37 m) height, a top width of 30 ft (9 m) and a length of 710 ft (216 m) , and has a maximum storage capacity of about 4,274 ac-ft (5.220 hm3 ) at top of dam elevation. The Matrullas Dam is owned by the Puerto Rico Electric Power Authority and is part of the Toro Negro Hydroelectric Project; a project developed by the P.R.E.P.A. for the primary purpose of generating electric power. Discharges from the Power Plants are collected by the Jacaguas River which flows into Guayabal Dam, at which dam they are regulated for irrigation of lands served by the Juana Diaz Canal. Gage-height and precipitation satellite telemetry at station. EXTREMES OBSERVED FOR PERIOD OF RECORD. --Maximum elevation 2,413.56 ft (735.65 m) , Jan. 6, 1992; minimum elevation, 2,375.55 ft (724.06 m) , Sept. 24, 25, 1994. EXTREMES OBSERVED FOR CURRENT YEAR. --Maximum elevation, 2,412.01 ft (735.18 m) , Jan. 11; minimum elevation, 2,375.55 ft (724.06 m), Sept. 24, 25. Capacity Table (based on data from Puerto Rico Electric Power Authority) Elevation, in feet 2,338 2,360 Contents, in acre-feet 2 302 Elevation, in feet 2,399 2,415 Contents, in acre-feet 1,845 2,945 DAY ELEVATION (FEET NGVD), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY OBSERVATION AT 24:00 VALUES NOV DEC JAN FBB MAR APR MAY JUN AUG 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN MAX MIN 2403.87 2403.91 2404.05 2403.94 2403.76 2403.50 2403.31 2403.17 2403.19 2403.31 2403.30 2403.35 2403.32 2403.23 2403.15 2403.31 2403.71 2403.86 2403.84 2403.76 2403.65 2403.52 2403.58 2403.75 2403.70 2403.65 2403.96 2404.00 2403.99 2404.08 2404.23 2403.64 2404.23 2403.15 2404.21 2404.16 2404.14 2404.21 2404.34 2404.47 2404.63 2404.78 2404.95 2405.09 2405.22 2405.35 2405.51 2405.73 2406.22 2406.77 2406.92 2407.06 2407.24 2407.36 2407.51 2407.66 2407.80 2407.85 2407.92 2408.06 2408.23 2408.37 2408.51 2408.65 --- 2406.30 2408.65 2404.14 2408 2408 2409 2409 2409 2409 2409 2409 2409 2409 2409 2409 2410 2410 2410 2410 2411 2411 2411 2411 2411 2411 2411 2411 2411 2411 2411 2411 2411 2411 2411 2410 2411 2408 .78 .88 .02 .15 .25 .28 .36 .45 .55 .65 .77 .87 .11 .54 .83 .96 .12 .34 .40 .48 .61 .61 .56 .65 .71 .80 .89 .88 .77 .70 .73 .60 .89 .78 2411.85 2411.91 2411.86 2411.92 2411.82 2411.85 2411.83 2411.86 2411.93 2411.98 2411.89 2411.77 2411.63 2411.48 2411.26 2411.26 2411.35 2411.33 2411.29 2411.27 2411.25 2411.29 2411.37 2411.36 2411.31 2411.24 2411. 18 2411.21 2411.30 2411.36 2411.32 2411.53 2411.98 2411.18 2411 2411 2411 2410 2410 2411 2410 2410 2410 2409 2409 2409 2409 2409 2408 2408 2408 2407 2407 2407 2407 2407 2407 2407 2406 2406 2406 2406 2408 2411 2406 .23 .12 .02 .94 .93 .02 .83 .51 .16 .80 .47 .40 .45 .26 .96 .66 .29 .89 .79 .83 .89 .69 .38 .07 .77 .70 .76 .64 ___ ___ --- .98 .23 .64 2406.41 2406.20 2405.90 2405.60 2405.52 2405.59 2405.42 2405.13 2404.82 2404.49 2404.20 2404.15 2404.27 2404.11 2403.83 2403.54 2403.23 2402.93 2402.87 2402.89 2402.70 2402.65 2402.43 2402.12 2401.70 2401.55 2401.58 2401.37 2401.05 2400.71 2400.38 2403.53 2406.41 2400.38 2400.29 2400.33 2400.38 2400.18 2399.87 2399.58 2399.35 2399.12 2399.07 2399.09 2398.93 2398.70 2398.43 2398.14 2398.00 2398.02 2398.08 2398.14 2397.96 2397.69 2397.39 2397.08 2396.64 2396.47 2396.20 2395.87 2395.49 2395.09 2394.66 2394.49 --- 2397.96 2400.38 2394.49 2394.48 2394.25 2393.82 2393.39 2392.97 2392.57 2392.43 2392.43 2392.26 2391.98 2391.85 2391.59 2391.15 2391.04 2391.13 2391.06 2391.03 2391.05 2391.11 2391.04 2390.70 2390.12 2389.59 2388.97 2388.59 2388.38 2388.05 2387.87 2387.87 2387.88 2387.83 2390.92 2394.48 2387.83 2387.72 2387.67 2387.72 2387.80 2387.86 2387.88 2387.97 2388.03 2388.07 2388.14 2388.18 2388.21 2388.25 2388.28 2388.31 2388.34 2388.39 2388.44 2388.50 2388.55 2388.58 2388.61 2388.47 2388.27 2388.21 2388.23 2388.06 2387.79 2387.53 2387.25 --- 2388.11 2388.61 2387.25 2386.99 2386.83 2386.82 2386.83 2386.77 2386.64 2386.52 2386.34 2386.25 2386.23 2386.15 2386.04 2385.88 2385.69 2385.46 2385.34 2385.29 2385.27 2385.17 2385.03 2384.87 2384.63 2384.47 2384.42 2384.42 2384.23 2383.96 2383.66 2383.34 2383.17 2383.14 2385.35 2386.99 2383.14 2383.03 2382.75 2382.42 2382.01 2381.55 2381.30 2381.32 2381.13 2380.81 2380.51 2380.28 2380.13 2380.05 2380.03 2379.93 2379.78 2379.62 2379.55 2379.39 2379.30 2379.28 2379.19 2379.05 2378.87 2379.00 2379.42 2379.51 2379.61 2379.56 2379.35 2379.12 2380.22 2383.03 2378.87 2378.81 2378.49 2378.33 2378.28 2378.27 2378.13 2377.91 2377.69 2377.47 2377.34 2377.32 2377.24 2377.08 2376.89 2376.73 2376.51 2376.40 2376.35 2376.25 2376.15 2376.01 2375.83 2375.62 2375.55 2375.61 2375.68 2375.73 2375.78 2375.82 2375.88 --- 2376.84 2378.81 2375.55 WTR YR 1994 MEAN 2396.95 MAX 2411.98 MIN 2375.55 94 RIO GRANDE DE MANATI BASIN 50034000 RIO BAOTA NEAR OROCOVIS, PR LOCATION.--Lat 18°14'10", long 66°27'18", Hydrologic Onit 21010001, on left bank, at bridge on Highway 157 (12.1 km), and 4.2 mi (6.8 km) west of Orocovis. DRAINAGE AREA.--16.7 mi 1 (43.3 km>). WATER-DISCHARGE RECORDS PERIOD OF RECORD.—February 1959 to April 1966 (annual low-flow measurements only), February to September 1969 (occasional measurements only), October 1969 to September 1982, October 1988 to current year. GAGE.—Water-stage recorder and crest-stage gage. Datum of gage is 772.82 ft (235.556 m) above mean sea level. REMARKS.--Records fair. Gage-height and precipitation satellite telemetry at station. DISCHARGE, CUBIC FEET PER SECOND, HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY OCT NOV DEC JAN FBB APR MAY JDN AOG SEP 1 14 9.8 2 12 9.4 3 11 9.3 4 11 8.7 5 11 8.4 6 11 8.3 7 11 8.2 8 11 8.6 9 10 9.0 10 10 8.9 11 10 8.2 12 10 8.2 13 10 8.6 14 10 11 15 10 26 16 12 43 17 33 22 18 29 15 19 15 18 20 13 13 21 12 11 22 12 10 23 12 9.7 24 12 9.4 25 13 9.1 26 13 9.2 27 21 9.8 28 33 9.0 29 34 8.8 30 15 8.6 31 11 TOTAL 452 356.2 MEAN 14.6 11.9 MAX 34 43 MIN 10 8.2 AC-FT 897 707 CFSM .87 .71 IN. 1.01 .79 STATISTICS OF MONTHLY MEAN MEAN 92.2 56.4 MAX 392 205 (WY) 1971 1971 MIN 14.6 8.14 (WY) 1994 1974 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN-DAY MINIMUM INSTANTANEOUS PEAK PLOW INSTANTANEOUS PEAK STAGE INSTANTANEOUS LOW FLOW ANNUAL RUNOFF (AC-FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 8.5 8.4 8.3 8.7 8.5 8.2 7.9 7.8 7.7 7.5 7.3 7.6 16 25 25 12 9.4 11 10 9.3 9.1 8.8 8.7 8.3 8.2 8.2 8.2 8.6 8.5 8.5 8.4 307.6 9.92 25 7.3 610 .59 .69 DATA 29.3 108 1971 8.95 1992 FOR 8.5 8.7 8.2 8.1 8.0 7.9 7.9 7.8 7.9 8.0 8.5 9.0 8.5 8.4 8.3 8.8 8.8 9.1 8.5 9.1 9.0 8.7 8.7 8.2 7.6 7.4 7.2 7.3 7.5 7.1 6.8 253.5 8.18 9.1 6.8 503 .49 .56 6.7 6.9 6.7 6.8 6.7 6.0 6.0 5.9 5.8 5.9 6.1 6.0 5.7 5.7 6.1 5.7 5.4 5.2 5.2 5.0 5.0 .9 .7 .9 .6 .4 .8 6.7 ___ ___ --- 159.5 5.70 6.9 4.4 316 .34 .36 FOR WATER YEARS 1969 20.5 83.4 1992 6.62 1973 13.7 30.9 1971 5.70 1994 4.9 6.1 .9 .2 .1 .3 .4 .1 3.8 3.9 3.9 4.1 5.0 4.0 4.1 4.8 4.1 3.8 3.7 3.7 3.9 4.0 4.0 3.9 3.9 3.8 3.9 3.9 4.1 4.2 4.2 129.7 4.18 6.1 3.7 257 .25 .29 - 1994 15.3 59.9 1972 4.18 1994 1993 CALENDAR YEAR 9284.0 25.4 485 7.3 7.7 18410 1.52 20.68 33 13 9.0 Apr 29 Dec 11 Dec 6 4.1 4.2 4.2 4.1 5.1 5.3 8.4 6.1 5.0 5.0 5.7 8.0 5.7 6.1 6.8 7.5 5.8 5.5 5.0 4.8 .8 .8 .5 .5 .5 6.8 7.8 7.3 5.8 5.2 --- 168.4 5.61 8.4 4.1 334 .34 .38 .7 .6 .5 .5 .4 .4 .4 .4 .2 .1 .4 .9 .5 .4 .3 .0 .3 .0 .6 .0 3.9 3.8 3.9 3.7 3.6 3.6 3.7 3.8 3.7 3.6 3.4 131.3 4.24 6.3 3.4 260 .25 .29 3.4 3.6 3.7 4.2 3.7 3.8 3.7 3.4 3.3 3.4 3.6 3.6 3.6 3.5 3.6 3.8 3.8 4.0 3.8 3.6 3. 3. 3. 3. 3. 3.6 3.5 3.5 3.5 3.6 --- 107.8 3.59 4.2 3.3 214 .22 .24 3.7 3.3 3.5 3.7 3.4 3.8 3.6 3.5 3.3 3.1 3.1 3.1 3.0 3.0 3.0 3.1 3.2 3.9 3.8 3.4 3.1 3.0 2.8 2.8 2.9 2.9 2.8 2.8 2.8 3.1 3.2 99.7 3.22 3.9 2.8 198 .19 .22 3.4 3.5 3.0 2.9 2.8 2.9 8.7 4.7 3.9 3.4 3.2 3.0 3.0 2.9 3.0 2.9 2.9 3.2 3.3 3.2 3.2 3.1 2.9 2.9 4.4 15 6.5 4.9 3.8 3.3 3.2 123.0 3.97 15 2.8 244 .24 .27 3.5 3.5 3.8 3.1 3.0 3.0 3.7 3.1 3.0 2.9 3.4 3.2 3.1 3.0 3.1 3.1 3.2 3.8 3.5 4.1 4.5 3.6 3.3 3.6 5.2 6.0 4.0 3.5 3.3 3.3 --- 106.4 3.55 6.0 2.9 211 .21 .24 , BY WATER YEAR (WY) 27.7 80.2 1980 5.61 1994 FOR 1994 2395 6 43 2 2 182 8 2 4750 5 11 4 3 48.5 179 1981 4.24 1994 WATER YEAR .1 .56 Nov 16 .8 Jul 23 .8 Jul 23 Oct 28 .66 Oct 28 .6 Jul 26 .39 .34 .8 . 1 19.7 78.6 1979 3.59 1994 16.3 104 1979 3.22 1994 WATER 34 79 6 3870 2 2 17800 21 2 24740 2 27 63 13 5 21.2 152 1979 3.97 1994 YEARS 1969 - .2 .3 .56 Oct 9 .8 Jul 23 .8 Jul 23 Oct 9 .90 Oct 9 .6 Jul 26 .04 .78 .5 50.8 149 1979 3.55 1994 1994 1979 1994 1970 1994 1994 1970 1970 1994 RIO GRANDS DE MANATI BASIN 95 50035000 RIO GRANDB 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 ARBA.--128 mi» (332 km2 ), excludes 6.0 mi' (15.5 km»), the runoff from which is diverted through El Guineo and de Hatrullas reservoirs. WATER-DISCHARGE RECORDS PERIOD OF RECORD.--September 1946 to September 1953. Hay 1956 to December 1957 (unpublished, available in files of Caribbean District Office and in the National Water Data Storage and Retrieval System, Washington, D.C.); February 1959 to September 1960 (monthly discharge measurements only); October 1960 to current year. Equivalent record from January 1971 to December 1972 published as 50035200 Rio Grande de Manati at Highway 145 at Ciales at site 1.6 mi (2.6 km) downstream, drainage area 132 mi» (342 km'). GAGE.—Water-stage recorder. Elevation of gage is 140 ft (43 m), from topographic map. Prior to Apr. 1, 1962, staff gage, read twice daily, at site 100 ft (30 m) upstream at same datum. January 1971 to December 1972 at site 1.6 mi (2.6 km) downstream at different datum. REMARKS.--Records fair except those for estimated daily discharges, which are poor. Gage-height and precipitation satellite telemetry at station. EXTREMES OUTSIDE PERIOD OF RECORD.--Approximate gage heights of major floods, pointed out by local residents are as follows: August 1899. 50 ft (15 m), September 1928, 36 ft (11 m), and September 1932. 34 ft (10 m) at site 1.6 mi (2.6 km) upstream. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY DEC JAN FBB MAR APR MAY JUN SEP 1 124 80 2 92 79 3 81 75 4 78 73 5 103 76 6 73 118 7 67 74 8 66 77 9 64 92 10 64 92 11 64 77 12 61 75 13 61 74 14 59 159 15 59 443 16 57 587 17 107 340 18 162 215 19 76 248 20 67 147 21 63 117 22 61 101 23 64 87 24 81 81 25 68 78 26 65 74 27 144 72 28 276 69 29 249 67 30 107 66 31 85 TOTAL 2848 4013 MEAN 91.9 134 MAX 276 587 MIN 57 66 AC-FT 5650 7960 CFSM .72 1.05 IN. .83 1.17 STATISTICS OF MONTHLY MEAN MEAN 439 350 MAX 2422 1006 (WY) 1971 1971 MIN 91.9 67.6 (WY) 1994 1974 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN-DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE ANNUAL RUNOFF (AC-FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 67 64 64 61 61 61 59 57 57 57 54 54 69 116 108 71 61 60 64 64 63 57 57 57 56 54 53 52 52 54 54 1938 62.5 116 52 3840 .49 .56 DATA 264 1296 1966 62.5 1994 FOR 54 54 56 55 53 52 52 51 47 48 53 59 59 54 54 52 52 56 58 54 59 55 54 51 50 50 50 50 50 52 52 1646 53.1 59 47 3260 .41 .48 FOR WATER 191 678 1952 53.1 1994 51 50 50 50 50 50 48 45 45 45 45 45 43 43 44 44 43 42 e41 e41 e41 41 41 42 43 43 44 114 ... ___ --- 1324 47.3 114 41 2630 .37 .38 YEARS 1946 170 1392 1950 41.6 1957 49 39 39 37 34 34 45 32 31 31 29 29 29 28 29 29 28 28 28 27 25 24 23 23 e23 e25 e24 e23 e25 e26 e25 921 29.7 49 23 1830 .23 .27 - 1994 140 477 1969 29.7 1994 1993 CALENDAR YEAR 75865 208 3710 52 54 150500 1. 22. 422 109 62 Apr 29 Dec 28 Dec 25 62 05 e40 e35 e30 e25 e26 48 30 28 29 26 26 56 51 30 40 38 34 31 28 25 23 26 24 24 24 25 148 75 48 36 —— 1129 37.6 148 23 2240 .29 .33 , BY WATER 268 1174 1969 28.5 1984 29 27 25 25 24 24 25 24 24 29 60 38 25 26 27 43 66 39 30 28 25 24 22 22 23 22 24 25 38 30 25 918 29.6 66 22 1820 .23 .27 YEAR (WY) 423 2293 1985 29.6 1994 23 22 28 28 24 20 19 19 18 18 17 17 17 17 16 19 17 17 17 17 17 15 15 15 13 13 14 14 14 15 --- 535 17.8 28 13 1060 .14 .16 157 458 1979 17.8 1994 FOR 1994 WATER YEAR 17265.9 47.3 587 8.5 9.5 1060 2.78 34250 .37 5.02 78 35 15 Nov 16 Jul 28 Jul 24 Oct 28 Oct 28 15 17 17 17 16 19 25 18 13 13 13 12 13 13 13 13 17 17 18 19 16 14 12 11 9.6 9.6 9.0 8.5 9.0 9.6 12 438.3 14.1 25 8.5 869 .11 .13 107 438 1979 14.1 1994 WATER 246 520 47 42700 8 9 125000 24 178000 1 26 447 115 53 16 19 14 19 10 10 117 78 39 29 21 15 13 12 11 11 9.6 11 17 17 42 36 19 16 18 20 40 28 81 29 20 837.6 27.0 117 9.6 1660 .21 .24 153 1212 1979 27.0 1994 YEARS 1946 - .3 May 18 .5 Jul 28 .5 Jul 24 Oct 9 .00 Oct 9 .92 .08 26 24 21 20 18 16 18 22 19 17 17 18 20 18 17 17 17 17 84 49 39 33 24 22 23 27 27 18 15 15 —— 718 23.9 84 15 1420 .19 .21 274 994 1979 23.9 1994 1994 1971 1994 1985 1994 1994 1970 1970 e Estimated 96 RIO GRANDB DB MANATI BASIN 50035500 RIO GRANDB DB MANATI AT HIGHWAY 149 AT CIALBS, RP WATER-QUALITY RECORDS LOCATION.—Lat 18°20'46", long 66<>28'06", at bridge on Highway 149, about 800 ft (244 m) upstream from confluence with Rio Cialitos, 0.5 mi (0.8 km) north of Ciales plaza. DRAINAGE AREA.—136 mi 1 (352 km1 ) this excludes the 6 mi 1 (15.5 km1 ) upstream from Lago El Guineo and Lago de Matrullas, flow from which is diverted to Rio Jacaguas. PERIOD OF RECORD.--Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE OCT 1993 05. .. DEC 06. .. FEE 1994 04. .. APR 06. .. JDN 17. .. AUG 11. . . DATE OCT 1993 05. . . DEC 06. . . FEE 1994 04. .. APR 06. .. JUN 17. .. AUG 11. . . TIME 1015 0925 0800 1240 1500 1000 HARD- NESS TOTAL (MQ/L AS CAC03 ) 110 -- -- -- -- 120 SILICA, DATE OCT 1993 05. . . DEC 06. . . FBB 1994 04. .. APR 06... JUN 17. .. AUG 11. . . K = non-ideal DIS- SOLVED (MG/L AS SI02) 29 -- -- -- -- 26 count DIS- CHARGE, INST. CUBIC FEET PER SECOND 141 83 61 89 37 40 CALCIUM DIS- SOLVED (MG/L AS CA) 27 -- -- -- -- 30 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 160 -- -- -- -- 182 SPE- CIFIC CON- DUCT- ANCE (US /CM) 245 270 265 268 258 288 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 9.3 -- -- -- -- 10 SOLIDS, DIS- SOLVED (TONS PER DAY) 61.1 -- -- -- -- 19.7 PH WATER WHOLE FIELD (STAND- ARD UNITS) 8.0 8.0 8.0 8.0 8.5 7.5 SODIUM, DIS- SOLVED (MG/L AS NA) 12 -- -- -- -- 15 RESIDUE TOTAL AT 105 DEG. C, SUS- PENDED (MG/L) 35 13 14 -- 5 18 TEMPER- ATURE WATER (DBG C) 27.0 26.0 24.0 28.0 30.5 27.0 SODIUM AD- SORP- TION RATIO 0.5 -- -- -- — 0.6 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) -- <0.20 <0.20 <0.20 <0.20 0.30 TUR- BID- ITY (NTU) 23 6.1 6.3 -- 1.8 7.7 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 2.0 -- -- -- -- 2.8 PHOS- PHORUS TOTAL (MG/L AS P) -- 0.060 0.070 0.090 0.030 0.090 OXYGEN, DIS- SOLVED (MG/L) 7.8 4.8 3.6 8.8 10.0 6.8 ALKA- LINITY WAT WH TOT FET FIELD MG/L AS CAC03 100 110 110 110 110 110 ARSENIC TOTAL (UG/L AS AS) <1 -- -- <1 -- — OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 97 58 42 112 132 85 SULFIDB TOTAL (MG/L AS S) 0.6 -- -- <0.5 -- "" BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 -- -- <100 -- -- OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) <10 <10 <10 -- <10 25 SULFATE DIS- SOLVED (MG/L AS S04) 9.1 — -- -- -- 16 BORON, TOTAL RECOV- ERABLE (UG/L AS B) 20 -- -- 30 -- — COLI- FORM, FECAL, 0.45 UM-MF (COLS . / 100 ML) K1300 K91 K64 240 460 440 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 12 -- -- -- -- 16 CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- <1 -- -- STREP- TOCOCCI FECAL, (COLS. PER 100 ML) 290 K150 73 K170 K45 300 FLUO- RIDB, DIS- SOLVED (MG/L AS F) 0.10 -- -- -- -- 0.20 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) <1 -- -- <1 -- — RIO GRANDE DE MANATI BASIN 50035500 RIO GRANDE DE MANATI AT HIGHWAY 149 AT CIALBS, PR—Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE OCT 1993 05. .. DEC 06. .. FEB 1994 04... APR 06. .. JUN 17. .. AUG 11. .. COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) <10 -- -- <10 -- -- IRON, TOTAL RECOV- ERABLE (UG/L AS PB) 1400 -- -- 1500 -- -- LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) 2 -- -- <1 -- -- MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MM) 110 -- -- 160 -- -- MERCURY TOTAL RECOV- ERABLE (UG/L AS HG) <0.10 — — <0.10 -- -- SELE- NIUM, TOTAL (UG/L AS SB) <1 -- -- <1 -- -- SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) <1 -- -- <1 — -- ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) 10 -- -- 10 -- -- CYANIDE TOTAL PHENOLS (MG/L TOTAL AS CN) (UG/L) <0.010 5 __ __ <0.010 4 __ -- MBTHY- LENB BLUB ACTIVE SUB- STANCE (MG/L) <0.02 -- -- <0.02 -- -- 98 RIO ORANDB DB MANATI BASIN 50035950 RIO CIALITOS AT HIGHWAY 649 AT CIALBS, PR WATER-QOALITY RECORDS LOCATION.--Lat 18°20'18", long 660 28'28", 100 ft (30 m) upstream from bridge on Highway 649, upstream from mouth, and about 0.4 mi (0.6 km) west of Ciales plaza. DRAINAGE AREA.--17.0 mi> (44.0 km»). PERIOD OF RECORD.--Hater years 1969-71, 1974 to current year. HATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 0.7 mi (1.1 km) OCT 05 DEC 06 FBB 04 APR 28 JUN 20 AUG 11 OCT 05 DEC 06 FEB 04 APR 28 JUN 20 AUG 11 OCT 05 DEC 06 FEB 04 APR 28 JUN 20 AUG 11 K = DATE 1993 . . . 1994 DATE 1993 . . . 1994 DATE 1993 1994 TIME 0900 1045 0945 1300 1255 1135 HARD- NESS TOTAL (MG/L AS CACO3) 100 -- -- 110 -- 130 SILICA, DIS- SOLVED (MG/L AS SI02) 32 -- -- 31 -- 24 DIS- CHARGE, INST. CUBIC FEET PER SECOND 24 15 13 6.0 2.3 3.5 CALCIUM DIS- SOLVED (MG/L AS CA) 30 -- -- 33 -- 39 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 158 -- -- 175 -- 186 SPE- CIFIC CON- DUCT- ANCE (US/CM) 240 262 265 262 273 301 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 6.7 -- -- 7.2 -- 7.3 SOLIDS, DIS- SOLVED (TONS PER DAY) 10.2 -- -- 2.82 -- 1.75 PH HATER WHOLE FIELD (STAND- ARD UNITS) 8.2 8.1 7.8 8.1 7.8 7.7 SODIUM, DIS- SOLVED (MG/L AS NA) 12 -- -- 13 -- 13 RESIDUE TOTAL AT 105 DBG. C, SUS- PENDED (MG/L) 6 4 4 27 7 14 TEMPER- ATURE HATER (DBG C) 24.0 22.5 21.0 26.5 29.5 26.5 SODIUM AD- SORP- TION RATIO 0.5 -- — 0.5 — 0.5 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) -- <0.20 <0.20 -- 0.20 0.30 TUR- BID- ITY (NTU) 1.8 1.2 1.0 2.3 2.6 2.7 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 1.7 -- -- 1.9 -- 1.8 PHOS- PHORUS TOTAL (MG/L AS P) -- 0.070 0.110 -- 0.070 0.090 OXYGEN, DIS- SOLVED (MG/L) 6.2 4.9 4.0 8.6 8.0 7.8 ALKA- LINITY HAT WH TOT FET FIELD MG/L AS CAC03 99 110 120 110 120 120 ARSENIC TOTAL (UG/L AS AS) <1 -- -- <1 -- -- OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 73 55 44 106 104 96 SULFIDB TOTAL (MG/L AS S) <0.5 -- -- <0.5 -- — — BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 -- -- 100 -- -- OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) <10 12 <10 <10 11 30 SULFATB DIS- SOLVED (MG/L AS S04) 6.3 -- -- 9.5 -- 15 BORON, TOTAL RECOV- ERABLE (UG/L AS B) 20 -- -- 20 -- -- COLI- FORM, FECAL, 0.45 UM-MF (COLS./ 100 ML) 380 K930 800 4600 K1000 K9800 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 10 -- -- 13 -- 14 CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- <1 -- -- STREP- TOCOCCI FECAL, (COLS . PER 100 ML) 580 2900 430 K15000 K63 7000 FLUO- RIDB, DIS- SOLVED (MG/L AS F) 0.10 -- -- 0.10 -- 0.20 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) <1 -- -- <1 -- -- non- ideal count RIO GRANDB DB MANATI BASIN 50035950 RIO CIALITOS AT HIGHWAY 649 AT CIALBS, PR—Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE OCT 1993 05. .. DEC 06... PBB 1994 04... APR 28. .. JUN 20... AUG 11. .. COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) <10 -- -- <10 -- -- IRON, TOTAL RECOV- ERABLE (UG/L AS PB) 200 -- -- 610 -- -- LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) 2 — -- 1 — — MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) 30 -- -- 50 -- -- MERCURY TOTAL RECOV- ERABLE (UG/L AS HG) <0.10 — — 0.80 — — SELE- NIUM, TOTAL (UG/L AS SB) <1 -- -- <1 -- -- SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) <1 — — <1 — — ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) 10 -- -- 10 -- -- CYANIDE TOTAL PHENOLS (MG/L TOTAL AS CN) (UG/L) <0.010 4 __ — <0.010 <1 — — MBTHY- LENB BLUB ACTIVE SUB- STANCE (MG/L) <0.02 -- -- <0.02 — -- 700 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 km1 ), approximately, of which about 38 mi> (98 km») is partly or entirely noncontributing, excludes 6.0 mi 1 (15.5 km1 ) upstream from Lago El Guineo and Lago de Matrullas. WATER-DISCHARGE RECORDS PERIOD OF RECORD.—1963-68 (annual maximum discharge only), February 1970 to current year. REVISED RECORDS.--WRD PR-86-1: 1970-71 (M), 1975, 1979, 1982-85 (P). GAGE.--Water-stage recorder. Elevation of gage is 14 ft (4 m), from topographic map. Prior to 1968 crest-stage gage at same site and datum 3.57 ft (1.09 m) lower. REMARKS.--Records fair except those for estimated daily discharges and May 1 to Sept 30, which are poor. Gage-height and precipitation satellite telemetry at station. Possible water extraction about 500 ft (152.4 m) upstream of gage by unknown source affecting low flow. EXTREMES OUTSIDE PERIOD OP 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) . DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY OCT NOV DEC JAN MAY JUN JUL AUG SEP 1 207 129 2 170 121 3 155 117 4 147 111 5 163 106 6 144 156 7 132 118 8 132 109 9 124 157 10 119 152 11 146 126 12 135 119 13 127 112 14 115 199 15 111 592 16 108 1160 17 147 794 18 210 418 19 145 366 20 122 260 21 115 208 22 110 178 23 108 159 24 125 147 25 115 141 26 110 132 27 175 132 28 319 129 29 597 124 30 212 126 31 149 --- TOTAL 4994 6898 MEAN 161 230 MAX 597 1160 MIN 108 106 AC-FT 9910 13680 CFSM .82 1.17 IN. .94 1.30 STATISTICS OF MONTHLY MEAN MEAN 775 566 MAX 2958 1803 (WY) 1971 1971 MIN 161 123 (WY) 1994 1974 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN-DAY MINIMUM INSTANTANEOUS PEAK PLOW INSTANTANEOUS PEAK STAGE ANNUAL RUNOFF (AC-FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 119 119 117 119 124 120 113 108 105 105 104 102 103 161 157 138 113 116 127 117 108 104 99 101 98 96 96 104 106 101 95 3495 113 161 95 6930 .57 .66 DATA 380 1498 1971 101 1992 POR 98 103 102 95 94 93 91 91 89 87 99 104 104 93 91 88 93 93 97 94 105 97 90 89 83 83 82 80 80 84 80 2852 92.0 105 80 5660 .47 .54 76 75 e78 80 80 82 75 74 74 72 71 70 69 67 69 73 70 66 65 66 65 66 66 69 67 66 64 102 ___ ___ --- 2017 72.0 102 64 4000 .37 .38 FOR WATER YEARS 1970 253 771 1992 92.0 1994 201 444 1988 72.0 1994 90 58 68 61 56 56 106 70 59 55 53 53 54 56 54 52 56 55 51 49 47 47 48 49 47 46 51 47 46 50 51 1741 56.2 106 46 3450 .29 .33 - 1994 190 521 1972 56.2 1994 1993 CALENDAR YEAR 127670 350 9770 81 87 253200 1.78 24.11 674 175 111 Apr 30 Apr 7 Apr 2 49 80 67 57 51 53 71 55 59 55 49 63 121 84 84 101 92 83 73 63 58 58 59 58 56 56 107 200 111 78 2251 75.0 200 49 4460 .38 .43 65 48 52 56 52 51 50 54 55 55 110 266 140 135 164 110 401 272 150 102 79 62 55 52 51 51 49 53 54 75 60 3029 97.7 401 48 6010 .50 .57 52 49 50 230 109 62 53 51 49 47 45 48 48 49 50 55 70 62 62 65 62 62 60 59 60 65 62 63 60 56 1915 63.8 230 45 3800 .32 .36 63 61 71 61 57 64 68 78 66 57 47 49 48 50 52 55 135 79 44 42 44 39 33 33 32 33 33 33 33 37 45 1642 53.0 135 32 3260 .27 .31 50 57 62 50 47 54 66 286 125 94 69 56 53 51 50 51 53 60 65 86 89 130 71 58 54 47 57 92 100 108 63 2354 75.9 286 47 4670 .39 .44 64 67 57 53 56 56 56 82 74 69 63 63 61 69 58 52 54 59 53 249 82 86 68 48 50 54 56 59 52 52 --- 2022 67.4 249 48 4010 .34 .38 , BY WATER YEAR (WY) 379 1037 1993 60.1 1984 FOR 1994 35210 96. 1160 32 33 1260 15. 69840 6. 147 71 49 680 3178 1985 93.7 1989 WATER YEAR 5 Nov 16 Jul 25 Jul 23 Nov 16 09 Nov 16 49 65 243 747 1987 63.8 1994 161 577 1979 53.0 1994 WATER 371 756 96. 55900 32 33 97200 33. 268500 1. 25. 652 169 89 220 1644 1979 67.9 1984 YEARS 1970 - 5 May 18 Jul 25 Jul 23 Oct 7 79 Oct 7 88 56 420 1510 1979 67.4 1994 1994 1971 1994 1985 1994 1994 1985 1985 e Estimated RIO GRANDE DE NANATI BASIN 50038100 RIO GRANDE DE NANATI AT HIGHWAY 2 NEAR MANATI, PR—Continued (National stream-quality accounting network station) WATER-QUALITY RECORDS PERIOD OP RECORD.--Water years 1969 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 707 DATE OCT 1993 26.. . DEC 17. .. PEB 1994 23. .. APR 29. . . JUN 24... ADG 25... DATE OCT 1993 26. . . DEC 17. .. PEB 1994 23. . . APR 29. . . JON 24. .. ADG 25. . . DATE OCT 1993 26. . . DEC 17. .. PEB 1994 23. . . APR 29. . . JON 24. .. ADG 25. . . DIS- PH OXYGEN, COLI- CHARGE, SPE- WATER DIS- FORM, STREP- HARD- INST. CIPIC WHOLE SOLVED PECAL, TOCOCCI NESS CALCIUM CDBIC CON- FIELD TEMPER- TOR- OXYGEN, (PER- 0.45 FECAL, TOTAL DIS- PEET DUCT- (STAND- ATURE BID- DIS- CENT UM-MF (COLS. (MG/L SOLVED TIME PER ANCE ARD WATER ITY SOLVED SATUR- (COLS./ PER AS (MG/L SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) 100 ML) 100 ML) CACO3) AS CA) 1130 110 1050 110 0955 66 1115 102 1330 61 1145 56 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 7.7 7.9 7.9 8.5 7.1 8.1 SOLIDS, DIS- SOLVED (TONS PER DAY) 55.5 53.4 33.8 49.6 27.6 29.0 SODIUM, DIS- SOLVED (MG/L AS NA) 12 11 12 12 12 13 NITRO- GEN, N02+N03 DIS- SOLVED (MG/L AS N) 0.740 0.780 0.160 -- 0.140 0. 100 310 292 315 299 252 327 SODIUM AD- SORP- TION RATIO 0.5 0.4 0.4 0.5 0.5 0.4 NITRO- GEN, AMMONIA DIS- SOLVED (MG/L AS N) 0.070 0.020 0.030 -- 0.020 0.050 8.0 7.5 7.6 7.6 7.8 7.7 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 2.1 1.6 1.3 1.8 0.70 1.2 NITRO- GEN, AMMONIA DIS- SOLVED (MG/L AS NH4) 0.09 0.03 0.04 -- 0.03 0.06 28.0 24.5 25.0 27.5 30.0 29.0 ALKA- LINITY WAT WH TOT PET FIELD MG/L AS CACO3 130 120 140 110 120 140 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.50 <0.20 0.20 -- 0.20 0.60 11 4.5 0.50 8.0 2.9 1.0 SULPATE DIS- SOLVED (MG/L AS S04) 8.5 8.8 7.6 9.7 6.9 8.3 PHOS- PHORUS TOTAL (MG/L AS P) 0.070 0.040 0.020 -- 0.030 0.030 4.0 5.4 5.7 6.8 9.8 9.8 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 13 12 13 15 14 12 PHOS- PHORUS DIS- SOLVED (MG/L AS P) 0.070 0.040 0.030 — 0.030 0.040 50 63 68 86 5200 310 4200 22000 470 4600 128 K1300 126 FLUO- RIDE, DIS- SOLVED (MG/L AS F) <0.10 <0.10 <0.10 0.10 0.10 0.20 PHOS- PHORUS ORTHO, DIS- SOLVED (MG/L AS P) 0.060 0.050 0.010 -- 0.020 0.020 K770 SILICA, DIS- SOLVED (MG/L AS SI02) 21 22 15 21 8.0 20 PHOS- PHATE, ORTHO, DIS- SOLVED (MG/L AS PO4) 0.18 0.15 0.03 -- 0.06 0. 06 27 580 240 K150 SOLIDS, RESIDUE AT 180 DEG. C DIS- SOLVED (MG/L) 191 177 188 180 169 183 ALUM- INUM, DIS- SOLVED (UG/L AS AL) 20 -- 20 -- <10 <10 130 40 130 38 140 44 130 38 120 36 150 45 SOLIDS, SUM OP CONSTI- TUENTS, DIS- SOLVED (MG/L) 187 180 186 172 158 192 BARIUM, DIS- SOLVED (UG/L AS BA) 43 -- 27 -- 31 36 K = non-ideal count 102 RIO GRANDB DB MANATI BASIN 50038100 RIO GRANDB DB MANATI AT HIGHWAY 2 NEAR MANATI, PR—Continued (National stream-quality accounting network station) WATER-QUALITY DATA, HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE OCT 1993 26... DEC 17... FBB 1994 23. .. APR 29... JUN 24. .. AUG 25. .. COBALT, DIS- SOLVED (UG/L AS CO) <3 -- <3 -- <3 __ IRON, DIS- SOLVED (UG/L AS PE) 8 -- 12 -- 15 -- LITHIUM DIS- SOLVED (UG/L AS LI) <4 -- <4 -- <4 -- NBSB, DIS- SOLVED (UG/L AS MN) 23 -- 25 -- 28 -- MERCURY DIS- SOLVED (UG/L AS HG) <0.1 -- -- -- 0.3 -- DENUM, DIS- SOLVED (UG/L AS MO) <10 -- <10 -- 10 -- NICKEL, DIS- SOLVED (UG/L AS NI) 1 -- <1 -- <1 -- NIUM, DIS- SOLVED (UG/L AS SB) <1 -- <1 -- <1 -- SILVER, DIS- SOLVED (UG/L AS AG) <1.0 -- <1.0 -- <1.0 -- TIUM, DIS- SOLVED (UG/L AS SR) 190 -- 220 -- 210 -- DIUM, DIS- SOLVED (UG/L AS V) 9 -- 6 -- 7 -- PESTICIDE ANALYSES DATE JUN 1994 24.. . DATE JUN 1994 24.. . DATE JUN 1994 24.. . CHLOR- DI- DI- BNDO- PCB, ALDRIN, DANE, DDD, DDE, DOT, AZINON, BLDRIN SULFAN, 1MB 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) 130 <0.1 <0.010 <0.1 <0.010 <0.010 <0.010 <0.01 <0.010 <0.010 BNDRIN WATER UNFLTRD BTHION, RBC (UG/L) <0.010 PARA- THION, TOTAL TOTAL (OG/L) <0.01 NAPH- THA- LENES, POLY- CHLOR. TOTAL (UG/L) (UG/L) <0.01 <0.10 HBPTA- CHLOR, TOTAL (OG/L) <0.010 PBR- THANE TOTAL (OG/L) <0.1 HBPTA- CHLOR BPOXIDB TOTAL (OG/L) <0.010 TOX- APHENE, TOTAL (OG/L) <1 LINDANB TOTAL (OG/L) <0.010 TOTAL TRI- THION (OG/L) <0.01 MALA- THION, TOTAL (OG/L) <0.01 2,4-D, TOTAL (OG/L) <0.01 METH- METHYL OXY- PARA- CHLOR, THION, TOTAL TOTAL (OG/L) (OG/L) <0.01 <0.01 2,4, 5-T 2, 4-DP TOTAL TOTAL (OG/L) (OG/L) <0.01 <0.01 MIRBX, TOTAL (OG/L) <0.01 SILVBX, TOTAL (OG/L) <0.01 PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT DATE OCT 26 DEC 17 FBB 23 APR 29 JUN 24 AUG 25 1993 . . . . . . 1994 . . . . . . TIME 1130 1050 0955 1115 1330 1145 STREAM- PLOW, INSTAN- TANEOUS (CFS) 110 110 66 102 61 56 SEDI- MENT, SUS- PENDED (MG/L) 44 18 74 34 25 44 SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) 13.1 5.6 13.2 9.36 4.12 6.65 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .062 MM 83 91 45 86 85 73 LAGUNA TORTUGUBRO BASIN 50038200 LAGDNA TORTOGUBRO 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.—Hater years 1964-66, 1969-71, 1974 to current year. HATER-QUALITY DATA, HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 703 DATE OCT 1993 08. .. DEC 08.. . FBB 1994 11.. . APR 12.. . JUN 17.. . AUG 04.. . DATE OCT 1993 08.. . DEC 08.. . FEB 1994 11.. . APR 12... JUN 17. .. AUG 04.. . TIME 0820 0830 0825 1120 1225 0750 RESIDUE TOTAL AT 105 DBG. C, SUS- PENDED (MG/L) 12 4 5 11 6 3 DIS- CHARGE, INST. CUBIC FEET PER SECOND 25 22 4.5 5.8 3.5 2.8 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.90 1.3 1.1 1.8 1.4 1.6 SPE- CIFIC CON- DUCT- ANCE (US/CM) 1250 1110 1240 1180 1430 1470 NITRO- GEN, TOTAL (MG/L AS N) 0.90 1.3 1.1 1.8 1.4 1.6 PH HATER WHOLE FIELD (STAND- ARD UNITS) 7.8 8.2 8.0 7.9 7.8 8.0 PHOS- PHORUS TOTAL (MG/L AS P) <0.010 <0.010 0.010 0.020 0.040 0.010 TEMPER- ATURE HATER (DBG C) 27.5 26.0 25.5 28.0 29.0 29.0 BORON, TOTAL RECOV- ERABLE (UG/L AS B) 70 -- -- 80 -- -- OXYGEN, DIS- SOLVED (MG/L) 8.0 8.7 1.8 7.0 6.0 6.4 COPPER, TOTAL RECOV- ERABLE (UG/L AS CD) <10 -- -- <10 -- -- OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 105 111 20 89 78 83 IRON, TOTAL RECOV- ERABLE (UG/L AS FB) 50 — — 50 -- -- OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 34 29 34 24 44 39 MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) <10 -- -- 20 -- -- COLI- FORM, FECAL, 0.45 UM-MF (COLS./ 100 ML) 27 36 20 K29 K210 80 ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) <10 -- -- <10 — -- STREP- TOCOCCI FECAL, (COLS. PER 100 ML) 43 31 320 380 K66 430 CYANIDE TOTAL (MG/L AS CN) <0.010 -- -- <0.010 -- -- ALKA- LINITY HAT WH TOT PET FIELD MG/L AS CAC03 157 142 110 100 98 98 PHENOLS TOTAL (UG/L) 3 — — 2 -- -- SULFIDB TOTAL (MG/L AS S) <0.5 -- -- <0.5 -- " MBTHY- LBNE BLUE ACTIVE SUB- STANCE (MG/L) 0.05 -- -- 0.12 -- -- K = non-ideal count 704 THIS PAGE WAS LEFT BLANK INTENTIONALLY 105 EXPLANATION 038320 SURFACE-WATER STATION AND NUMBER 0397 QUALITY-OF-WATER STATION AND NUMBER 213 WELL AND WELL NUMBER \.W«*»IMCZ 0123456 KILOMETERS 01234 MILES Figure 17.--Rfo Cibuco basin. 706 RIO CIBOCO BASIN 50038320 RIO CIBUCO BELOW COROZAL, PR LOCATION.--Lat 18021'13", long 66<>20'07", Hydrologic Unit 21010001, on right bank, 150 ft (46 m) downstream from junction with Rio Corozal, and 1.4 mi (2.3 km) northwest of Corozal. DRAINAGE AREA.--15.1 mi 2 (39.1km»). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--Hay 1969 to current year. GAGE.--Water-stage recorder. Elevation of gage is 195 ft (59 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. Gage-height and precipitation satellite telemetry at station. Daily discharge affected by sewage treatment plant about 0.6 mi (1.0 km) upstream from station. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG 1 16 11 2 15 9.8 3 15 9.2 4 16 9.2 5 18 8.8 6 14 8.3 7 30 8.2 8 20 12 9 15 15 10 13 10 11 13 11 12 13 9.9 13 12 16 14 11 40 15 11 62 16 13 70 17 12 52 18 10 46 19 11 34 20 11 25 21 13 18 22 10 15 23 11 14 24 10 13 25 9.5 13 26 8.4 12 27 8.6 12 28 9.7 18 29 13 14 30 9.2 11 31 8.6 TOTAL 400.0 607.4 MEAN 12.9 20.2 MAX 30 70 MIN 8.4 8.2 AC-FT 793 1200 CFSM .85 1.34 IN. .99 1.50 STATISTICS OF MONTHLY MEAN MEAN 41.2 45.0 MAX 135 155 (WY) 1991 1971 MIN 8.05 8.15 (WY) 1979 1974 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN-DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE ANNUAL RUNOFF (AC-FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 11 11 11 13 12 11 10 10 9.5 9.4 9.4 9.4 9.2 9.3 8.8 9.1 8.7 14 10 10 9.2 8.7 8.8 8.0 7.9 8.1 9.0 11 8.6 8.7 8.0 301.8 9.74 14 7.9 599 .64 .74 DATA 36.1 169 1971 6.86 1979 FOR 8.5 10 8.8 7.7 8.0 8.4 8.4 7.9 7.9 7.8 16 9.4 8.3 7.8 7.1 7.7 9.0 8.0 7.6 11 9.3 7.5 7.2 7.4 6.8 6.4 6.7 7.2 7.5 6.6 6.3 254.2 8.20 16 6.3 504 .54 .63 FOR WATER 24.5 69.6 1992 8.20 1994 6.2 6.5 6.3 7.3 7.8 7.1 6.9 7.0 6.7 7.4 6.0 6.1 5.9 7.3 6.6 6.3 5.7 5.4 5.3 5.7 5.7 5.8 5.4 5.7 5.8 6.1 38 15___ ___ --- 217.0 7.75 38 5.3 430 .51 .53 YEARS 1969 21.1 51.3 1988 7.75 1994 7.0 7.4 6.8 5.4 8.0 7.7 5.8 5.9 5.3 5.3 5.0 5.4 5.6 4.9 5.8 6.3 5.8 5.7 5.7 5.6 5.2 5.3 5.0 .9 .7 .2 .7 .6 5.2 5.8 4.5 174.5 5.63 8.0 4.2 346 .37 .43 - 1994 22.4 65.1 1981 4.36 1984 1993 CALENDAR YEAR 10922. 29. 705 5. 6. 21670 1. 26. 52 15 8. 7 9 Apr 11 5 Mar 22 0 Apr 1 98 91 6 4.2 4.2 4.2 3.7 15 9.0 4.3 3.9 3.7 7.1 6.6 9.7 5.4 8.7 9.9 5.4 9.9 7.2 4.5 4.3 4.2 3.6 3.2 2.8 2.7 2.6 12 19 28 7.8 216.8 7.23 28 2.6 430 .48 .53 , BY WATER 35.3 111 1973 3.32 1984 3.9 3.5 3.1 3.1 2.7 2.6 2.9 3.1 3.1 3.5 3.1 3.5 7.7 9.3 5.2 5.8 22 7.4 4.2 3.3 2.8 2.8 2.7 2.3 2.4 2.1 1.7 1.9 2.3 1.7 1.7 127.4 4.11 22 1.7 253 .27 .31 YEAR (WY) 45.8 157 1986 3.20 1977 1.6 1.7 1.7 2.0 2.0 1.7 1.9 1.6 1.7 1.4 1.6 1.8 1.3 1.4 1.6 1.2 1.5 2.0 2.2 1.7 1.5 1.3 1.2 1.1 1.0 1.0 1.2 2.6 2.4 2.1 49.0 1.63 2.6 1.0 97 .11 .12 15.0 44.4 1987 1.63 1994 FOR 1994 WATER YEAR 2726.61 7.47 70 .91 1.2 220 5.05 5410 .49 6.72 13 5.8 1.7 Nov 16 Jul 17 Jun 21 Feb 27 Feb 27 1.9 2.4 2.0 1.9 2.0 7.1 3.9 2.9 1.9 1.4 1.5 1.4 1.4 1.3 1.8 1.1 .91 1.8 1.8 1.4 1.6 2.1 1.7 1.6 1.9 1.9 1.8 2.4 3.1 3.4 4.5 67.81 2.19 7.1 .91 135 .14 .17 12.2 34.6 1979 2.19 1994 WATER 28 56 7 2370 1 13600 19 20680 1 25 49 13 5 4.7 3.0 2.4 2.7 1.7 1.7 e20 e28 e!2 e9.9 4.7 3.5 3.2 2.3 1.9 1.9 1.5 e9.5 e9.6 e25 e!2 6.3 4.5 4.3 3.5 2.7 2.6 3.1 2.9 1.6 1.7 194.4 6.27 28 1.5 386 .42 .48 16.6 50.8 1979 3.44 1978 YEARS 1969 - .5 .5 .47 May 18 .91 Jul 17 .2 Jun 21 Nov 7 .80 Nov 7 .89 .68 .6 8.6 2.6 1.9 1.4 1.4 2.2 2.1 2.0 1.9 1.6 2.3 2.6 2.6 2.4 2.1 2.1 2.0 2.4 7.7 6.6 4.8 5.1 3.3 2.9 15 13 5.5 3.7 2.3 2.2 116.3 3.88 15 1.4 231 .26 .29 25.9 73.2 1979 3.88 1994 1994 1971 1994 1985 1994 1994 1979 1979 e Estimated 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 1993 TO SEPTEMBER 1994 707 DATS OCT 1993 25.. . DEC 13... FBB 1994 08. .. APR 26. .. JUN 21... ADO 05... DATE OCT 1993 25. .. DEC 13. .. FBB 1994 08... APR 26. .. JDN 21. .. AOG 05. .. DATE OCT 1993 25. .. DEC 13. .. FBB 1994 08. .. APR 26. . . JON 21. .. AOG 05. .. TIME 1030 0845 0835 0810 0815 1310 HARD- NESS TOTAL (MG/L AS CACO3) 130 -- -- 83 -- 210 SILICA, DIS- SOLVED (MG/L AS SI02) 32 -- -- 35 -- 35 DIS- CHARGE, INST. CUBIC FEET PER SECOND 10 9.0 6.6 2.7 1.1 1.9 CALCIUM DIS- SOLVED (MG/L AS CA) 34 -- -- 22 -- 59 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 214 -- -- 223 -- 341 SPE- CIFIC CON- DUCT- ANCE (US/CM) 343 371 382 450 576 624 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 12 -- -- 6.7 -- 14 SOLIDS, DIS- SOLVED (TONS PER DAY) 5.96 -_ -- 1.60 -- 1.71 PH HATER WHOLE FIELD (STAND- ARD UNITS) 7.9 7.9 7.7 7.8 7.4 7.8 SODIUM, DIS- SOLVED (MG/L AS NA) 20 -_ -- 26 -- 46 RESIDUE TOTAL AT 105 DBG. C, SUS- PENDED (MG/L) <1 2 4 62 5 7 TEMPER- ATURE HATER (DBG C) 26.0 22.0 22.0 25.0 27.0 27.0 SODIUM AD- SORP- TION RATIO 0.8 _- -- 1 — 1 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.30 <0.20 0.40 _- 0.90 0.60 TUR- BID- ITY (NTU) 0.30 0.50 0.70 7.8 0.50 0.50 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 3.2 __ _- 1.9 -- 8.5 PHOS- PHORUS TOTAL (MG/L AS P) 0.410 0.400 0.750 __ 2.70 2.10 OXYGEN, DIS- SOLVED (MG/L) 3.6 4.9 5.3 4.4 5.6 7.6 ALKA- LINITY WAT WH TOT FBT FIELD MG/L AS CAC03 130 130 130 150 120 160 ARSENIC TOTAL (UG/L AS AS) <1 — — <1 — -- OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 44 56 60 53 70 95 SULFIDB TOTAL (MG/L AS S) <0.5 -- -- <0.5 -- - - BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) 100 _- -- 100 -- -- OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 12 <10 27 <10 21 14 SULFATE DIS- SOLVED (MG/L AS S04) 14 -_ -- 17 -- 21 BORON, TOTAL RECOV- ERABLE (UG/L AS B) 20 _- -- 30 -- -- COLI- FORM, FECAL, 0.45 UM-MP (COLS./ 100 ML) K1300 K1500 7600 2000 K6600 K1200 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 21 _- -- 24 -- 61 CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- <1 -- -- STREP- TOCOCCI FECAL, (COLS. PER 100 ML) 400 240 280 K1SO 970 K1000 FLUO- RIDB, DIS- SOLVED (MG/L AS P) 0.20 -- -- 0.10 -- 0.10 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) <1 -- -- <1 -- -- K = non- ideal count 108 RIO CIBUCO BASIN 50038320 RIO CIBUCO BELOW COROZAL, PR—Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE OCT 1993 25. .. DEC 13. .. FBB 1994 08. .. APR 26. .. JUN 21. . . AUG 05. .. COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) <10 -- -- 10 -- -- IRON, TOTAL RECOV- ERABLE (UG/L AS FE) 130 -- -- 2300 -- -- MANGA- LBAD, NBSB, TOTAL TOTAL RECOV- RECOV- ERABLE ERABLB (UG/L (UG/L AS PB) AS MN) 1 40 __ __ 3 390 __ — MERCURY TOTAL RECOV- ERABLE (UG/L AS HG) <0.10 __ — <0.10 -- — SELE- NIUM, TOTAL (UG/L AS SB) <1 -- -- <1 -- -- SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) <1 — — <1 -- -- ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) 20 -- -- 20 -- -- CYANIDE TOTAL PHENOLS (MG/L TOTAL AS CN) (UG/L) <0.010 <1 __ __ <0.010 <1 __ __ METHY- LBNB BLOB ACTIVE SUB- STANCE (MG/L) <0.02 -- -- <0.02 -- -- RIO CIBOCO BASIN 50039500 RIO CIBOCO AT VEGA BAJA, PR LOCATION.--Lat 18°26'53", long 66°22'29 H , 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 1 (256.7 km1 )/ of which 25.4 mi 1 (65.8 km1 ), does not contribute directly to surface runoff. WATER-DISCHARGE RECORDS PERIOD OF RECORD.--January 1973 to current year. GAGE.--Water-stage recorder. Datum of gage is 7.79 ft (2.374 m) above mean sea level. REMARKS.--Records fair. Gage-height and precipitation satellite telemetry at station. EXTREMES OUTSIDE PERIOD OF RECORD.--Flood of Dec. 11, 1965 reached a stage of 26.2 ft (7.99 m), datum unknown, discharge about 28,000 ft'/s (793 m'/s). DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES 109 DAY NOV JAN APR MAY JUN AUG SEP 1 124 37 2 76 39 3 83 35 4 114 34 5 119 32 6 81 32 7 75 31 8 87 30 9 42 69 10 41 55 11 51 37 12 123 39 13 54 38 14 45 179 15 41 393 16 43 507 17 110 377 18 50 308 19 42 269 20 43 151 21 44 111 22 46 87 23 43 74 24 39 68 25 37 63 26 36 58 27 37 58 28 39 53 29 55 72 30 38 52 31 34 TOTAL 1892 3388 MEAN 61.0 113 MAX 124 507 MIN 34 30 AC-FT 3750 6720 CFSM .62 1.14 IN. .71 1.27 STATISTICS OF MONTHLY MEAN MEAN 160 185 MAX 559 523 (WY) 1986 1980 MIN 45.9 40.0 (WY) 1974 1974 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN -DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE INSTANTANEOUS LOW FLOW ANNUAL RUNOFF (AC-FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 46 44 43 49 65 49 45 43 40 40 39 38 37 36 37 36 34 56 50 45 37 36 34 34 32 32 34 45 39 36 35 1266 40.8 65 32 2510 .41 .48 DATA 179 1316 1982 30.5 1979 FOR 37 45 38 33 33 32 31 31 32 35 88 59 34 29 30 29 33 33 29 40 55 37 31 30 29 27 26 26 28 28 24 1092 35.2 88 24 2170 .36 .41 FOR WATER 93.8 209 1988 35.2 1994 24 24 24 26 27 26 24 24 24 23 23 23 24 24 27 25 24 24 23 22 23 23 23 23 23 22 22 119 ___ ___ --- 763 27.2 119 22 1510 .27 .29 YEARS 1973 88.3 190 1988 27.2 1994 30 25 26 22 32 29 24 20 20 20 19 21 23 20 19 19 19 18 17 17 16 16 15 15 15 15 41 15 15 18 16 637 20.5 41 15 1260 .21 .24 - 1994 90.1 339 1990 20.5 1994 1993 CALENDAR YEAR 50373 138 3260 28 31 99910 1. 18. 301 65 37 Apr 30 Apr 6 Apr 1 39 91 15 16 15 13 13 65 25 18 17 22 30 38 36 21 37 32 24 43 26 22 20 19 17 16 15 15 28 93 144 139 1034 34.5 144 13 2050 .35 .39 34 23 20 19 18 18 17 17 16 16 22 28 40 104 91 57 319 265 151 51 34 26 22 21 19 17 15 14 14 14 13 1535 49.5 319 13 3040 .50 .58 13 13 14 13 14 14 13 13 13 13 12 12 11 11 12 12 14 13 13 12 11 10 10 11 11 12 . 10 12 17 16 --- 375 12.5 17 10 744 .13 .14 16 21 24 16 13 14 53 47 17 13 11 9.5 9.1 8.9 8.8 9.0 9.8 9.7 10 11 10 9.7 9.2 8.6 8.1 8.2 8.3 8.8 9.5 11 11 433.2 14.0 53 8.1 859 .14 .16 14 12 9.6 8.5 8.9 12 13 86 37 86 34 18 15 14 12 11 11 13 51 30 130 44 22 30 35 18 14 13 17 13 11 843.0 27.2 130 8.5 1670 .27 .32 15 40 20 15 12 13 14 15 13 13 13 15 14 13 13 13 13 13 13 82 41 35 28 21 24 164 49 28 22 17 --- 801 26.7 164 12 1590 .27 .30 , BY WATER YEAR (WY) 166 671 1987 16.2 1984 FOR 1994 14059 38 507 8 8 1040 7 7 27890 5 70 24 12 213 655 1985 24.7 1977 WATER YEAR .2 .5 Nov 16 . 1 Jul 25 .7 Jul 23 May 17 .91 May 17 .5 Jul 26 .39 .28 75.2 245 1987 12.5 1994 54.3 162 1979 14.0 1994 WATER 126 236 38 14600 7 8 34000 19 7 91080 1 17 226 59 24 81.8 461 1979 21.2 1978 YEARS 1973 - .5 Dec 13 .4 Jul 24 .5 Jul 21 Apr 12 .10 Apr 12 .4 Jul 24 .27 .24 117 450 1979 26.7 1994 1994 1982 1994 1981 1977 1977 1987 1987 1977 110 50039500 RIO CIBDCO AT VEGA BAJA, PR—Continued WATBR-QOALITY RECORDS PERIOD OF RECORD.—Water years 1972 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE OCT 1993 08. .. DEC 08. .. FEE 1994 11. .. APR 12. .. JDN 21. .. AOG 04. .. DATE OCT 1993 08. .. DEC 08. .. FBB 1994 11. . . APR 12. .. JUN 21. .. AOG 04. .. DATE OCT 1993 08. .. DEC 08. . . FBB 1994 11. .. APR 12. .. JUN 21. .. AUG 04. .. TIME 1045 1055 1030 1430 1140 1025 HARD- NESS TOTAL (MG/L AS CACO3) 160 -- -- -- — 190 SILICA, DIS- SOLVED (MG/L AS SI02) 23 -- -- -- -- 14 DIS- CHARGE, INST. CUBIC FEET PER SECOND 67 40 25 38 11 8.2 CALCIUM DIS- SOLVED (MG/L AS CA) 48 -- -- -- -- 60 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 258 -- -- -- -- 275 SPE- CIFIC CON- DUCT- ANCE (US /CM) 382 425 423 399 432 465 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 9.5 -- -- — -- 10 SOLIDS, DIS- SOLVED (TONS PER DAY) 46.6 -- -- -- -- 6.05 PH WATER WHOLE FIELD (STAND- ARD UNITS) 7.5 7.8 7.7 7.3 7.6 7.6 SODIUM, DIS- SOLVED (MG/L AS NA) 16 -- -- -- -- 23 RESIDUE TOTAL AT 105 DBG. C, SUS- PENDED (MG/L) 46 7 7 -- 1 <1 TEMPER- ATURE WATER (DBG C) 26.0 25.0 24.0 27.5 29.0 28.5 SODIUM AD- SORP- TION RATIO 0.6 -- -- -- -- 0.7 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.40 — 0.30 — 0.20 0.20 TUR- BID- ITY (NTU) 25 2.7 1.6 -- 0.20 0.20 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 3.8 -- -- -- -- 2.7 PHOS- PHORUS TOTAL (MG/L AS P) 0.240 -- 0.250 -- 0.420 0.290 OXYGEN, DIS- SOLVED (MG/L) 5.7 3.2 1.6 8.4 5.6 3.0 ALKA- LINITY WAT WH TOT FBT FIELD MG/L AS CAC03 200 180 180 160 190 200 ARSENIC TOTAL (UG/L AS AS) <1 -- -- 1 -- -- OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 69 38 19 106 72 38 SULFIDB TOTAL (MG/L AS S) <0.5 -- -- <0.5 -- "" BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 -- -- <100 -- -- OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 13 <10 <10 -- 13 <10 SULFATB DIS- SOLVED (MG/L AS SO4) 15 -- — -- -- 12 BORON, TOTAL RECOV- ERABLE (UG/L AS B) 20 -- -- 40 -- -- COLI- FORM, FECAL, 0.45 UM-MF (COLS./ 100 ML) 2700 K660 400 K160 K140 300 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 23 -- -- -- -- 33 CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- <1 -- -- STREP- TOCOCCI FECAL, (COLS. PER 100 ML) K1300 660 100 200 K10 510 FLUO- RIDB, DIS- SOLVED (MG/L AS F) 0.20 -- — — -- 0.20 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) 2 -- -- <1 -- -- K = non-ideal count RIO CIBUCO BASIN 50039500 RIO CIBUCO AT VEGA BAJA, PR—Continued HATER-QUALITY DATA, HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 Ill DATE OCT 1993 08. .. DEC 08... FBB 1994 11. . . APR 12. .. JUN 21... ADO 04. .. COPPER, TOTAL RECOV- ERABLE (DO/L AS CD) <10 -- -- <10 -_ -- IRON, TOTAL RECOV- ERABLE (DO/L AS FB) 1100 -- -- 120 -- -- LEAD, TOTAL RECOV- ERABLE (DO/L AS PB) 2 -- -- <1 _- -- MANGA- NESE, TOTAL RECOV- ERABLE (DO/L AS MN) 60 -- -- 10 -- -- MERCURY TOTAL RECOV- ERABLE (DG/L AS HO) <0.10 — -- <0.10 __ -- SELE- NIUM, TOTAL (DO/L AS SB) <1 -- -- <1 _- -- SILVER, TOTAL RECOV- ERABLE (DO/L AS AG) <1 — -- <1 -- -- ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) 20 -- -- <10 -- -- CYANIDE TOTAL PHENOLS (MO/L TOTAL AS CN) (UO/L) <0.010 2 — __ <0.010 5 __ __ MBTHY- LBNB BLUB ACTIVE SUB- STANCE (MO/L) 0.02 -- -- 0.03 -- -- 112 THIS PAGE WAS LEFT BLANK INTENTIONALLY / 13 0123456 KILOMETERS EXPLANATION A 0460 SURFACE-WATER STATION ^ ww AND NUMBER V 0430 QUALITY-OF-WATER STATION AND NUMBER 0399 v—7 QUALITY-OF-WATER PARTIAL V 216 RECORD STATION AND NUMBER 039990 WELL AND WELL NUMBER LAKE-ELEVATION STATION 01 234 MILES Figure 18.--Rio de la Plata basin. 1 14 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 mi (1.1 km) northwest from Escuela Carite Chino, 1.2 mi (1.9 km) northeast from Central Hidroelectrica de Carite Num. 1 and 1.8 mi (2.9 km) northeast from Escuela Segunda Unidad. DRAINAGE AREA.--8.20 mi 8 (21.24 km8 ) . ELEVATION RECORDS PERIOD OF RECORD.—Hay 1989 to current year. GAGE.--Water stage recorder. Datum of gage is mean sea level. REMARKS.--Lago Carite Dam was completed in 1913. The operation of the reservoir is controlled by the utilization of water to meet the demands for domestic, industrial and agricultural purposes in the Guayama Area. The dam is an earthfill with crest elevation of 1,806 ft (550 m) above mean sea level, with a structural height of 104 ft (32 m) and a lenght of 500 ft (152 m). The dam has a capacity of approximately 11,310 acre-feet (13.9 hm3 ). The Dam is operated by the Puerto Rico Electric and Power Authority. Gage-height and precipitation satellite telemetry at station. EXTREMES OBSERVED FOR PERIOD OF RECORD.—Maximum elevation 1,787.61 ft (544.86 m), Jan. 5, 1992; minimum elevation, 1,761.48 ft (536.90 m), June 13, 14, 1990. EXTREMES FOR CURRENT YEAR.--Maximum elevation 1,781.50 ft (543.00 m), Oct. 1; minimum elevation, 1,767.28 ft (538.67 m), Sept. 10. Capacity Table (based on Data from Puerto Rico Electric Power Authority) Contents, in acre-feet Elevation, in feet Elevation, in feet 1,746 0 1,760 2,471 1,769 4,561 1,775 1,780 1,790 Contents, in acre-feet 6,194 7,704 11,048 DAY ELEVATION (FEET NGVD), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY OBSERVATION AT 24s00 VALUES OCT JAN FEB MAR JUN AUG 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN MAX MIN 1781.47 1781.43 1781.40 1781.39 1781.40 1781.49 1781.47 1781.45 1781.43 1781.40 1781.41 1781.40 1781.38 1781.37 1781.34 1781.37 1781.37 1781.34 1781.32 1781.29 1781.26 1781.31 1781.32 1781.29 1781.31 1781.31 1781.29 1781.27 1781.25 1781.22 1781.20 1781.35 1781.49 1781.20 1781.18 1781.13 1781.11 1781.08 1781.05 1781.01 1780.98 1780.97 1780.93 1780.90 1780.83 1780.76 1780.70 1780.66 1780.65 1780.66 1780.71 1781.02 1781.11 1781.18 1781.23 1781.27 1781.29 1781.27 1781.30 1781.41 1781.40 1781.39 1781.36 1781.47 --- 1781.07 1781.47 1780.65 1781.44 1781.40 1781.34 1781.38 1781.36 1781.32 1781.28 1781.20 1781.19 1781.14 1718.11 1781.04 1781.02 1780.99 1780.94 1780.90 1780.84 1780.81 1780.77 1780.71 1780.68 1780.66 1780.61 1780.59 1780.51 1780.49 1780.48 1780.49 1780.47 1780.44 1780.39 1778.87 1781.44 1718.11 1780.39 1780.36 1780.34 1780.32 1780.35 1780.34 1780.33 1780.31 1780.33 1780.33 1780.32 1780.24 1780.26 1780.23 1780.18 1780.17 1780.11 1780.10 1780.03 1779.98 1779.96 1779.89 1779.85 1779.82 1779.78 1779.71 1779.66 1779.59 1779.57 1779.53 1779.45 1780.06 1780.39 1779.45 1779.44 1779.40 1779.34 1779.33 1779.25 1779.20 1779.17 1779.12 1779.03 1779.02 1778.95 1778.89 1778.85 1778.86 1778.80 1778.78 1778.74 1778.66 1778.64 1779.12 1779.12 1779.10 1779.11 1779.07 1779.04 1779.01 1778.97 1779.01 ___ ___ —— 1779.04 1779.44 1778.64 1779.01 1778.99 1778.96 1778.89 1778.87 1778.82 1778.73 1778.72 1778.67 1778.66 1778.63 1778.57 1778.50 1778.47 1778.43 1778.36 1778.31 1778.23 1778.18 1778.13 1778.06 1778.01 1777.94 1777.90 1777.80 1777.73 1777.66 1777.60 1777.54 1777.51 1777.45 1778.30 1779.01 1777.45 1777.39 1777.31 1777.26 1777.16 1777.12 1777.05 1776.98 1776.91 1776.82 1776.75 1776.72 1776.64 1776.56 1776.50 1776.43 1776.39 1776.37 1776.31 1776.19 1776.12 1776.05 1776.01 1775.95 1775.93 1775.83 1775.78 1775.69 1775.63 1775.52 1775.47 --- 1776.43 1777.39 1775.47 1775.39 1775.32 1775.25 1775.21 1775.16 1775.08 1775.02 1775.00 1775.11 1775.33 1775.30 1775.27 1775.23 1775.17 1775.08 1774.97 1774.89 1774.82 1774.74 1774.67 1774.57 1774.51 1774.43 1774.32 1774.22 1774.10 1773.99 1773.87 1773.76 1773.64 1773.54 1774.74 1775.39 1773.54 1773.43 1773.33 1773.24 1773.16 1773.07 1773.09 1773.02 1772.93 1772.82 1772.75 1772.69 1772.63 1772.54 1772.47 1772.44 1772.39 1772.42 1772.42 1772.37 1772.30 1772.25 1772.17 1772.10 1772.04 1771.97 1772.31 1772.24 1772.21 1772.16 1772.19 --- 1772.57 1773.43 1771.97 1772.12 1772.07 1772.07 1772.04 1772.00 1771.95 1771.92 1771.88 1771.83 1771.76 1771.71 1771.61 1771.55 1771.47 1771.36 1771.31 1771.20 1771.76 1771.55 1771.49 1771.35 1771.27 1771.14 1771.03 1770.92 1770.77 1770.61 1770.50 1770.35 1770.22 1770.14 1771.39 1772.12 1770.14 1770.01 1769.89 1769.75 1769.64 1769.50 1769.36 1769.22 1769.10 1769.00 1768.94 1768.87 1768.83 1768.79 1768.72 1768.68 1768.63 1768.56 1768.72 1768.64 1768.55 1768.44 1768.38 1768.28 1768.37 1768.40 1768.30 1768.22 1768.16 1768.03 1767.93 1767.85 1768.77 1770.01 1767.85 1767.79 1767.77 1767.64 1767.54 1767.44 1767.47 1767.38 1767.37 1767.33 1767.36 1767.74 1767.74 1767.72 1767.67 1768.07 1768.11 1768.09 1768.05 1768.34 1770.34 1770.43 1770.44 1770.52 1770.55 1770.54 1770.52 1770.48 1770.45 1770.40 1770.36 --- 1768.72 1770.55 1767.33 RIO DE LA PLATA BASIN 1 15 50043000 RIO DB LA PLATA AT PROYECTO LA PLATA, PR LOCATION.--Lat 18°09'37", long 66°13'44" / Hydrologlc Unit 21010005, at upstream side of bridge on Highway 173, 0.4 mi (0.6 km) northeast of Proyecto La Plata, and 2.5 mi (4.0 km) upstream from Rio Usabon. DRAINAGE AREA.--63.0 mi 3 (163.2 km3 ), excludes 8.2 mi> (21.1 km>) upstream from Carite Reservoir, the flow of which is diverted to Rio Guamani. WATER-DISCHARGE RECORDS PERIOD OP 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 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 mVs) into Cidra Reservoir. Gage-height and precipitation satellite telemetry at station. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY OCT NOV DEC JAN MAR APR JUN AUG SEP 1 e50 e!2 2 e31 ell 3 e27 ell 4 e23 e!2 5 e21 e!3 6 e20 ell 7 e22 ell 8 e21 e!2 9 el 9 e!8 10 e!8 e!9 11 e!6 e!5 12 e!4 e!4 13 e!5 e!3 14 e!5 e30 15 e!4 e90 16 e21 e200 17 e37 e80 18 e33 e230 19 e20 ellO 20 e!7 e60 21 e!5 e72 22 e!4 e45 23 e!5 e35 24 e!7 e28 25 e!6 e24 26 e!4 e30 27 e!5 e52 28 e24 e34 29 el9 e26 30 e!4 e24 31 e!3 --- TOTAL 630 1342 MEAN 20.3 44.7 MAX 50 230 MIN 13 11 AC-FT 1250 2660 CFSM .37 .82 IN. .43 .91 STATISTICS OF MONTHLY MEAN MEAN 202 177 MAX 2164 831 (WY) 1971 1978 MIN 7.82 12.1 (WY) 1969 1982 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN-DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE ANNUAL RUNOFF (AC-FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS e36 e28 e22 e20 e21 e22 e!9 e!8 e!6 e!6 e!5 e!4 e35 e66 e40 e23 e!7 e!6 e!7 e!8 e!5 e!4 el4 e!4 e!3 e!3 e!2 e!4 e!5 e!5 e!4 632 20.4 66 12 1250 .37 .43 DATA 98.4 565 1971 9.16 1990 FOR e!5 e20 e25 e!8 e!6 e!4 e!3 e!2 e!2 e!4 e!7 e!9 e!8 e!4 e!5 e!4 e!5 e!6 elS e!4 e!5 e!4 e!3 e!2 ell ell e!2 e!3 e!2 ell ell 451 14.5 25 11 895 .27 .31 FOR WATER 64.5 519 1992 7.78 1990 ell e!3 e!2 e!3 e!2 e!2 ell elO e9.8 e9.8 e9.6 e9.6 e9.4 e9.6 ell e!2 ell e9.4 e9.4 e!2 e52 e25 e!5 e!4 elS e!3 ell elO ___ ___ --- 374.6 13.4 52 9.4 743 .24 .25 YEARS 1960 44.8 195 1989 7.65 1990 e25 e48 e27 e!8 e!2 ell e9.6 e8.4 e8.0 e8.0 e9.2 e9.2 e9.3 e9.8 e9.5 elO ell ell e9.0 e8.4 e8.2 e8.0 e8.2 e8.6 e8.2 e8.4 e8.8 e8.6 e8.8 e9.4 ell 367.6 11.9 48 8.0 729 .22 .25 - 1994 33.3 120 1972 4.72 1977 1993 CALENDAR YEAR 17186. 47. 1200 8. 8. 34090 11. 84 24 12 1 1 Jul 11 2 Apr 7 8 Apr 1 86 67 ell elO e9.6 elO e!3 e!7 e!6 e!7 e!6 elS e26 e!9 e!4 ell ell e9.6 e8.6 e7.4 e9.0 e8.6 e9.0 e8.8 e9.0 e!8 e!9 e28 e60 e25 e!9 e!4 --- 468.6 15.6 60 7.4 929 .29 .32 e!3 e!2 e!2 ell e!2 ell elO e9.4 e!4 e30 e45 e20 e!7 elS e20 e30 e21 elS e!6 e!3 ell e9.8 e8.6 e8.0 e9.0 elO e9.6 e9.0 e8.6 eS.O e8.8 449.8 14.5 45 8.0 892 .26 .31 e8.6 e8.0 e7.2 e6.2 e6.4 e6.4 ell e8.8 e6.8 e6.0 e6.4 e6.2 e5.8 e6.6 elO e!4 elS e!7 e!3 e9.0 e6.8 e5.6 e5.2 e4.8 e7.0 e23 e58 e30 e!9 e!4 --- 354.8 11.8 58 4.8 704 .22 .24 ell e7.6 e6.6 e7.4 e9.6 e!2 e8.6 e7.4 e6.6 e6.2 e5.8 e5.8 e6.4 e6.6 e6.4 e6.2 e6.2 e6.2 e32 e!6 ell e9.6 e8.0 e7.2 e7.2 e6.8 e6.8 e7.0 e6.2 e6.4 e6.4 263.2 8.49 32 5.8 522 .15 .18 e6.4 e6.2 e6.0 e5.8 e5.2 e7.0 e20 e34 e8.4 elO ell e!4 ell e8.4 e7.4 e6.4 e7.4 e9.8 e!2 e!3 e21 e8.0 e7.4 e7.6 e!7 e35 e!7 e9.9 e7.4 e7.0 e9.0 355.7 11.5 35 5.2 706 .21 .24 ell e!2 elS e!4 elS e25 e58 e30 e!3 elO e20 e56 e24 elO e8.8 e!80 e45 e28 e21 e450 e!40 e45 e26 e23 e22 e!3 e9.8 e8.6 e9.2 ell --- 1353.4 45.1 450 8.6 2680 .82 .92 , BY WATER YEAR (WY) 49.7 323 1971 6.61 1977 FOR 1994 7042 19 450 4 6 13970 4 30 13 7 102 594 1985 6. 66 1968 WATER YEAR .7 .3 Sep 20 .8 Jun 24 . 1 Jul 30 .35 .78 .0 92.4 629 1970 4.93 1977 82.8 489 1961 5.30 1977 WATER 101 368 19 20300 2 3 73600 36 72930 1 24 153 28 8 131 642 1961 9.45 1967 YEARS 1960 ,3 Sep .6 Jul .2 Jul Jan .39 Jan .84 .96 .8 151 975 1960 11.9 1967 - 1994 1971 1994 6 1960 25 1974 6 1977 5 1992 5 1992 e Estimated 116 RIO DB LA PLATA BASIN 50043000 RIO DB LA PLATA AT PROYECTO LA PLATA, PR—Continued WATER-QUALITY RECORDS PERIOD OP RECORD.—Water years 1958 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE OCT 1993 12. .. DEC 03. .. FEB 1994 02. .. APR 18. .. JUN 15. .. AOG 12. .. DATE OCT 1993 12. .. DEC 03. .. FEB 1994 02. . . APR 18. .. JUN 15. .. AOG 12. .. DATE OCT 1993 12. .. DEC 03. .. FEB 1994 02. .. APR 18. .. JUN 15. . . AUG 12. .. TIME 0940 0945 0850 0845 1020 1115 HARD- NESS TOTAL (MG/L AS CAC03) 150 -- -- 150 -- 130 SILICA, DIS- SOLVED (MG/L AS SI 02) 24 -- — 23 -- 21 DIS- CHARGE, INST. CUBIC FEET PER SECOND 14 22 Ell 7.4 10 16 CALCIUM DIS- SOLVED (MG/L AS CA) 37 -- -- 37 -- 33 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 253 -- -- 272 -- 251 SPE- CIFIC CON- DUCT- ANCE (US/CM) 422 390 501 455 441 423 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 14 -- -- 15 -- 12 SOLIDS, DIS- SOLVED (TONS PER DAY) 9.56 -- -- 5.45 -- 10.7 PH WATER WHOLE FIELD (STAND- ARD UNITS) 8.0 4.0 7.0 7.7 8.0 7.7 SODIUM, DIS- SOLVED (MG/L AS HA) 30 -- -- 37 -- 37 RESIDUE TOTAL AT 105 DBG. C, SUS- PENDED (MG/L) 4 13 5 5 12 13 TEMPER- ATURE WATER (DBG C) 27.0 25.0 23.0 25.5 26.0 28.5 SODIUM AD- SORP- TION RATIO 1 -- -- 1 -- 1 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.30 0.20 0.50 -- 1.0 0.50 TUR- BID- ITY (NTU) 2.1 6.2 1.3 1.2 2.0 1.4 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 2.7 -- -- 2.9 -- 3.4 PHOS- PHORUS TOTAL (MG/L AS P) 0.450 0.380 0.800 -- 0.890 0.690 OXYGEN, DIS- SOLVED (MG/L) 7.2 4.0 2.8 7.4 7.0 7.6 ALKA- LINITY WAT WH TOT PET FIELD MG/L AS CAC03 160 140 180 160 140 140 ARSENIC TOTAL (UG/L AS AS) <1 -- -- 1 -- -- OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 91 49 33 92 88 100 SULFIDE TOTAL (MG/L AS S) <0.5 -- -- <0.5 -- "" BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 -- -- <100 -- -- OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 14 16 120 12 13 34 SULFATE DIS- SOLVED (MG/L AS S04) 20 -- -- 22 -- 20 BORON, TOTAL RECOV- ERABLE (UG/L AS B) 70 -- -- 80 -- — COLI- FORM, FECAL, 0.45 UM-MF (COLS./ 100 ML) 2500 200 290 K100 550 450 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 29 -- -- 39 -- 40 CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- <1 -- -- STREP- TOCOCCI FECAL, (COLS. PER 100 ML) K10 K140 210 K130 3100 530 FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.20 -- -- 0.20 -- 0.20 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) <1 -- -- <1 -- -- K = non-ideal count E = estimated RIO DE LA PLATA BASIN 50043000 RIO DE LA PLATA AT PROYECTO LA PLATA, PR—Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 1 17 COPPER, TOTAL RECOV- ERABLE (OG/L AS CO) IRON, TOTAL RECOV- ERABLE (OG/L AS FE) LEAD, TOTAL RECOV- ERABLE (OG/L AS PB) MANGA- NESE, TOTAL RECOV- ERABLE (OG/L AS MN) MERCURY TOTAL RECOV- ERABLE (OG/L AS HG) SELE- NIUM, TOTAL (OG/L AS SE) SILVER, TOTAL RECOV- ERABLE (OG/L AS AG) ZINC, TOTAL RECOV- ERABLE (OG/L AS ZN) CYANIDE TOTAL (MG/L AS CN) PHENOLS TOTAL (OG/L) MBTHY- LENE BLOE ACTIVE SUB- STANCE (MG/L) OCT 1993 12. .. DEC 03. .. FEB 1994 02. .. APR 18. .. JON 15. .. AOG 12. .. 150 <1 30 0.10 220 80 <0.10 <0.010 <0.010 0.02 0.04 118 RIO DB LA PLATA BASIN 50043800 RIO DB LA PLATA AT COMBRIO, PR LOCATION.--Lat 18°13'23", long 66°13'30", Hydrologic Unit 21010005, on right bank 50 ft (15 m) upstream from bridge off Highway 167 in the Town of Comerio, 0.4 mi (0.6 km) southwest of Comerio High School, and 0.2 mi (0.3 km) northeast of Plaza de Comerio. DRAINAGE AREA.--109 mi» (282 km 1 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.—December 1988 to current year. GAGE.—Water-stage recorder and crest-stage gage. Datum of gage is 604.2 ft (184.160 m) above mean sea level. REMARKS.--Records fair. Gage-height and precipitation satellite telemetry at station. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY OCT NOV DEC JAN FEE MAR APR MAY JON AOG SEP 1 149 26 2 72 25 3 58 25 4 50 25 5 46 27 6 44 23 7 49 23 8 47 24 9 40 39 10 37 39 11 34 31 12 32 31 13 32 28 14 32 34 15 30 88 16 50 434 17 81 160 18 78 487 19 42 457 20 36 125 21 33 157 22 31 108 23 32 79 24 36 60 25 33 51 26 30 51 27 30 114 28 52 69 29 42 52 30 31 49 31 26 TOTAL 1415 2941 MEAN 45.6 98.0 MAX 14 9 487 MEN 26 23 AC-FT 2810 5830 CFSM .42 .90 IN. .49 1.01 STATISTICS OF MONTHLY MEAN MEAN 234 97.1 MAX 866 166 (WY) 1991 1993 MEN 40.6 42.6 (WY) 1992 1990 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN-DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE INSTANTANEOUS LOW FLOW ANNUAL RUNOFF (AC-FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 76 56 46 42 44 45 41 36 33 34 30 29 53 135 81 41 34 32 35 36 32 30 29 29 28 26 25 27 32 31 30 1278 41.2 135 25 2530 .38 .44 DATA 54.8 112 1993 23.9 1990 FOR 29 27 29 31 35 32 29 27 25 26 35 40 35 29 32 29 28 - 33 31 29 30 28 26 24 23 23 23 26 25 24 22 885 28.5 40 22 1760 .26 .30 22 25 24 25 24 22 21 20 20 19 19 19 18 19 22 25 19 18 18 20 103 38 25 26 35 22 20 24 ___ _-_ ___ 712 25.4 103 18 1410 .23 .24 FOR WATER YEARS 1989 165 732 1992 22.8 1990 84.6 247 1989 24.4 1990 58 78 50 29 21 20 17 15 15 15 17 17 18 19 17 21 21 18 16 15 15 15 15 16 15 16 17 17 16 17 20 676 21.8 78 15 1340 .20 .23 - 1994 39.5 75.7 1989 20.6 1993 1993 CALENDAR YEAR 42537 117 3060 15 16 84370 1.07 14.58 194 51 25 Jul 11 Apr 7 Apr 1 19 18 17 19 29 33 29 31 28 27 63 111 71 49 50 46 38 34 31 32 31 36 34 34 34 104 171 58 39 32 1348 44.9 171 17 2670 .41 .46 , BY WATER 56.1 162 1993 22.3 1991 25 22 20 20 19 20 19 18 16 17 59 39 26 20 19 22 39 28 19 16 14 13 11 10 10 11 13 12 12 11 10 610 19.7 59 10 1210 .18 .21 YEAR (WY) 95.0 263 1992 19.7 1994 11 11 10 9.0 7.7 8.3 7.6 14 10 8.3 7.4 8.5 7.7 7.2 8.2 8.8 17 23 23 15 11 8.3 6.6 5.9 5.8 7.7 71 30 16 12--- 397.0 13.2 71 5.8 787 .12 .14 61.5 194 1993 13.2 1994 FOR 1994 WATER YEAR 12887.2 35.3 554 5.8 7.3 2370 6.73 5.6 25560 .33 4.42 58 24 8.5 Sep 20 Jun 25 Jul 31 Sep 20 Sep 20 Jun 24 12 9.5 8.6 7.8 11 15 12 9.9 9.0 7.7 7.2 6.8 6.8 8.1 8.5 8.1 8.4 13 38 15 11 11 9.9 9.1 8.6 8.6 7.9 8.6 8.6 7.5 7.9 321.1 10.4 38 6.8 637 .10 .11 85.3 291 1993 10.4 1994 WATER 94 133 35 14600 5 7 127000 29 5 68250 11 130 34 15 8.0 7.8 7.5 7.4 6.5 6.2 9.0 38 11 9.4 10 14 15 12 9.9 8.1 7.2 8.2 12 15 21 14 9.0 8.3 9.5 42 28 15 9.8 8.3 7.6 394.7 12.7 42 6.2 783 .12 .14 56.7 114 1993 12.7 1994 YEARS 1989 .2 .3 Jan .8 Jun .3 Jul Jan .22 Jan .6 Jun .87 .80 12 13 16 18 16 19 68 52 21 11 15 66 34 15 10 208 71 46 24 554 382 77 36 30 31 18 13 11 9.4 13--- 1909.4 63.6 554 9.4 3790 .59 .65 189 729 1989 51.2 1991 - 1994 1993 1994 5 1992 25 1994 31 1994 5 1992 5 1992 24 1994 RIO DE LA PIATA BASIN 50043600 RIO D8 LA PIATA AT COMERIO, PR—Continued WATER-QUALITY RECORDS PERIOD OF RECORD.— Water years 1969 to current year. PERIOD OF DAILY RECORD.-- SUSPENDED-SEDIMENT DISCHARGE: October 1989 to September 1994. INSTRUMENTATION.— USD-77 and automatic sediment sampler. REMARKS.—Sediment samples were collected by a local observer on a week basis and during high flow events. EXTREMES FOR PERIOD OF DAILY RECORD.— SEDIMENT CONCENTRATIONi Maximum daily mean, 6,600 mg/L Jan. 05, 1992; Minimum daily mean, 2 mg/L few days. SEDIMENT LOADS: Maximum daily mean, 950,000 tons (662,000 tonnes) Jan. 05, 1992; Minimum daily mean, 0.06 ton (0.05 tonne) Aug 20, 1990. EXTREMES FOR WATER YEARS 1994.-- SEDIMENT CONCENTRATIONS Maximun daily mean, 223 mg/1 Nov. 19, 1993; Minimun daily mean, 4 mg/L Several days. SEDIMENT LOADS: Maximun daily mean, 796 tons (724 tonnes) Nov. 16, 1993; Minimun daily mean 0.06 tons (0.07 tonnes) Apr. 07, JU1. 12, 1994. 1 19 SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) OCTOBER 1 2 3 4 5 6 7 6 9 10 11 12 13 14 15 16 17 16 19 20 21 22 23 24 25 26 27 26 29 30 31 149 72 56 50 46 44 49 47 40 37 34 32 32 32 30 50 61 78 42 36 33 31 32 36 33 30 30 52 42 31 26 52 20 22 21 16 14 15 16 17 20 35 46 47 45 30 26 49 40 15 11 11 11 10 10 9 10 10 19 18 11 9 26 4.0 3.4 2.6 1.9 1.6 2.0 2.0 1.8 1.9 3.1 4.1 4.0 3.6 2.5 4.9 11 9.5 1.8 1.1 .92 .68 .65 .86 .61 .79 .87 4.0 2.2 .90 .66 NOVEMBER 26 25 25 25 27 23 23 24 39 39 31 31 26 34 86 434 160 487 457 125 157 106 79 60 51 51 114 69 52 49 —— 8 9 9 9 9 9 9 9 9 9 7 7 6 6 9 183 79 229 233 63 78 55 30 11 10 13 33 29 10 9 —— .58 .60 .60 .64 .64 .56 .57 .61 .89 .90 .59 .56 .50 .71 2.3 269 41 798 430 22 35 17 6.6 1.8 1.4 1.9 10 5.6 1.4 1.1 —— DECEMBER 76 56 46 42 44 45 41 36 33 34 30 29 53 135 61 41 34 32 35 36 32 30 29 29 28 26 25 27 32 31 30 10 9 9 10 10 16 20 20 20 19 16 15 26 67 29 11 11 11 12 13 13 14 15 15 15 15 15 15 15 14 13 2.1 1.4 1.1 1.1 1.2 1.9 2.2 1.9 1.6 1.7 1.4 1.2 15 36 9.0 1.2 1.0 .96 1.1 1.2 1.1 1.1 1.2 1.2 1.1 1.1 1.0 1.1 1.2 1.2 1.0 TOTAL 1415 106.94 2941 1673.27 1278 96.76 120 RIO DE LA PLATA BASIN 50043600 RIO DE LA PLATA AT COHERIO, PR—Continued SEDIMENT DISCHARGE, SUSPENDED {TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 )AY 1 2 3 4 5 6 7 6 9 10 11 12 13 14 15 16 17 16 19 20 21 22 23 24 25 26 27 26 29 30 31 MEAN DISCHARGE (CPS) 29 27 29 31 35 32 29 27 25 26 35 40 35 29 32 29 26 33 31 29 30 26 26 24 23 23 23 26 25 24 22 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CPS) (MG/L) (TONS/DAY) JANUARY 13 14 14 12 10 e 7 e e e e e 7 7 7 e 10 9 7 6 4 4 5 6 e 10 11 39 12 13 13 FEBRUARY MARCH 1.0 1.0 1.0 .97 1.0 .66 .60 .60 .56 .55 .74 .66 .62 .61 .62 .70 .73 .77 .61 .47 .36 .35 .39 .43 .51 .59 .65 2.9 .65 .62 .76 22 25 24 25 24 22 21 20 20 19 19 19 16 19 22 25 19 16 16 20 103 36 25 26 35 22 20 24 12 11 10 7 5 4 5 7 8 6 5 5 6 7 6 9 10 11 11 12 23 6 4 6 19 14 12 14 .72 .70 .64 .51 .37 .26 .26 .40 .43 .34 .26 .26 .31 .40 .52 .59 .54 .53 .53 .97 6.6 .63 .25 .61 1.6 .65 .69 .90 56 76 50 29 21 20 17 15 15 15 17 17 16 19 17 21 21 16 16 15 15 15 15 16 15 16 17 17 16 17 20 27 42 52 64 67 66 62 47 29 16 12 14 15 17 19 21 30 40 49 54 57 60 62 63 60 43 20 10 9 9 9 5.2 9.6 7.0 5.0 4.0 3.5 2.6 1.9 1.2 .65 .52 .64 .73 .66 .69 1.2 1.7 1.9 2.0 2.2 2.3 2.4 2.5 2.5 2.5 1.6 .65 .44 .36 .41 .45 TOTAL 665 23.30 712 24.33 676 70.24 RIO DE LA PLATA BASIN 727 50043800 RIO DE LA PLATA AT COHERIO, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CPS) (MG/L) (TONS/DAY) (CPS) (MG/L) (TONS/DAY) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 19 18 17 19 29 33 29 31 28 27 €3 111 71 49 50 46 38 34 31 32 31 36 34 34 34 104 171 58 39 32 ___ APRIL 15 33 51 42 21 46 1 2 8 16 33 50 49 55 56 45 29 16 15 18 18 50 €2 €2 €3 67 107 82 76 71 ___ MAY .74 1.5 2.3 2.0 1.7 4.9 .08 .16 .61 1.1 7.8 15 9.3 7.6 7.3 5.9 3.0 1.5 1.2 1.6 1.5 4.6 5.8 5.8 5.7 32 54 13 8.2 6.0 ___ 25 22 20 20 19 20 19 18 16 17 59 39 26 20 19 22 39 28 19 16 14 13 11 10 10 11 13 12 12 11 10 61 45 27 14 10 10 11 21 38 56 74 93 106 78 40 18 21 17 11 11 9 7 6 6 6 11 14 11 10 9 9 4.3 2.7 1.5 .73 .50 .53 .58 .98 1.6 2.6 12 9.8 7.4 4.3 1.9 1.0 2.3 1.3 .57 .45 .34 .25 .19 .16 .16 .32 .45 .37 .29 .25 .24 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CPS) (MG/L) (TONS/DAY) JUNE 11 11 10 9.0 7.7 8.3 7.6 14 10 8.3 7.4 8.5 7.7 7.2 8.2 8.8 17 23 23 15 11 8.3 6.6 5.9 5.8 7.7 71 30 16 12 ___ 9 9 10 11 18 61 81 54 36 20 14 13 11 8 6 5 11 8 14 10 6 4 6 8 9 6 37 18 11 8 ___ .25 .26 .26 .24 .34 1.1 1.6 2.0 1.1 .44 .27 .25 .22 .16 .12 .12 .54 .50 .86 .42 .17 .10 .11 .14 .14 .12 11 1.5 .47 .29 ___ TOTAL 1348 211.89 610 60.06 397.0 25.09 122 DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL YEAR MEAN DISCHARGE (CPS) 12 9.5 8.6 7.8 11 15 12 9.9 9.0 7.7 7.2 6.8 6.8 8.1 8.5 8.1 8.4 13 38 15 11 11 9.9 9.1 8.6 8.6 7.9 8.6 8.6 7.5 7.9 321.1 12887.2 RIO DE LA PLATA BASIN 50043800 RIO DE LA PLATA AT COMBRIO, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) JULY 10 10 10 11 11 12 12 12 11 8 6 4 4 5 5 5 5 7 23 8 6 8 10 11 11 8 6 5 5 10 13 .31 .25 .22 .23 .32 .49 .39 .32 .26 .19 .11 .08 .09 .11 .11 .10 .11 .25 4.3 .35 .18 .26 .25 .28 .27 .20 .13 .11 .12 .21 .26 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MO/L) (TONS/DAY) AUGUST 8.0 7.8 7.5 7.4 6.5 6.2 9.0 38 11 9.4 10 14 15 12 9.9 8.1 7.2 8.2 12 15 21 14 9.0 8.3 9.5 42 28 15 9.8 8.3 7.6 10 11 12 11 10 10 10 21 11 12 14 16 15 15 13 11 7 10 5 9 11 9 8 7 6 23 11 8 8 9 9 .22 .21 .22 .21 .18 .17 .26 2.5 .32 .31 .38 .59 .64 .47 .34 .22 .15 .23 .16 .38 .68 .34 .20 .16 .15 3.2 .97 .32 .22 .19 .18 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) SEPTEMBER 12 13 16 18 16 19 68 52 21 11 15 66 34 15 10 208 71 46 24 554 382 77 36 30 31 18 13 11 9.4 13 7 6 11 6 9 12 36 28 16 12 9 34 15 9 9 93 24 11 16 133 166 38 30 25 18 13 10 9 8 7 .22 .22 .49 .28 .38 .65 7.7 4.2 .92 .36 .37 8.2 1.6 .36 .25 63 5.5 1.2 1.0 495 227 8.9 2.7 2.0 1.5 .61 .33 .26 .20 .26 10.86 3153.17 394.7 14.77 1909.4 835.66 RIO DE LA PLATA BASIN 50043600 RIO DE LA PLATA AT COMERIO, PR—Continued HATER QUALITY DATA, HATER TEAR OCTOBER 1993 TO SEPTEMBER 1994 PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT 123 DIS- CHARGE, INST. CUBIC FEET PER SECOND SEDI- MENT, SUS- PENDED (MO/L) SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) SED. SUSP. FALL DIAM. PERCENT FINER THAN .002 MM SED. SUSP. FALL DIAM. PERCENT FINER THAN .004 MM SED. SUSP. FALL DIAM. PERCENT FINER THAN .006 MM DATE TIME SEP 1994 20... 1925 I860 956 4660 64 62 67 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 SEP 1994 20... 91 92 96.7 99.7 100 100 100 124 RIO DE LA PLATA BASIN 50043800 RIO DE LA PLATA AT COMERIO, PR--Continued WATER QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 SILT AND CLAY PERCENT OF SUSPENDED SEDIMENT DATE OCT 1993 07.. . NOV 18.. . 19.. . SEP 1994 20.. . 20.. . 20.. . 20.. . TIME 1800 1715 0720 1645 1703 1740 1150 STREAM- FLOW, INSTAN- TANEOUS (CFS) SEDI- MENT, SUS- PENDED (MG/L) SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .062 MM 55 443 509 1300 2300 493 10 90 244 298 546 545 2340 299 13 292 410 1920 3380 3110 8.0 73 98 99 46 91 92 91 RIO DB LA PLATA BASIN 50044000 RIO DB LA PLATA NEAR COMERIO, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°14'33", long 66°12'28", at bridge on Highway 156, 0.56 mi (0.9 km) upstream from dam, about 2.0 mi (3.2 km) northeast of Comerio plaza. DRAINAGE ARBA.--139 mi 1 (360 km1 ), excludes 8.2 mi 1 (21.1 km1 ) upstream from Carite Reservoir, the flow of which is diverted to Rio Ouamani. PERIOD OF RECORD.--Water years 1979 to current year. WATBR-QOALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 125 DATE OCT 1993 13. .. DEC 01. .. JAN 1994 31. .. APR 07. .. JUN 14. .. AUG 03. .. DATE OCT 1993 13. .. DEC 01. . . JAN 1994 31. . . APR 07. .. JUN 14. .. AUG 03. .. DATE OCT 1993 13. .. DEC 01. .. JAN 1994 31. . . APR 07. .. JUN 14. .. AUG 03. .. TIME 1200 1010 0835 0800 1120 0850 HARD- NESS TOTAL (MG/L AS CACO3 ) 150 -- -- -- -- 140 SILICA, DIS- SOLVED (MG/L AS SI02) 27 -- -- -- -- 30 DIS- CHARGE, INST. CUBIC FEET PER SECOND 46 112 35 28 27 18 CALCIUM DIS- SOLVED (MG/L AS CA) 35 -- -- -- -- 31 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 232 -- -- -- -- 243 SPE- CIFIC CON- DUCT- ANCE (US /CM) 386 370 433 410 395 403 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 15 -- -- -- -- 14 SOLIDS, DIS- SOLVED (TONS PER DAY) 28.7 -- -- -- -- 11.7 PH WATER WHOLE FIELD (STAND- ARD UNITS) 8.4 8.0 8.1 7.9 7.8 8.2 SODIUM, DIS- SOLVED (MG/L AS NA) 23 -- -- -- -- 30 RESIDUE TOTAL AT 105 DEG. C, SUS- PENDED (MG/L) 4 18 8 -- 9 6 TEMPER- ATURE WATER (DBG C) 29.0 25.0 22.5 25.0 28.0 27.0 SODIUM AD- SORP- TION RATIO 0.8 -- -- -- -- 1 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.70 0.20 0.20 0.40 0.40 0.40 TUR- BID- ITY (NTU) 0.90 8.3 1.0 -- 6.3 1.8 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 2.9 -- -- -- -- 2.6 PHOS- PHORUS TOTAL (MG/L AS P) 0.170 0.240 0.290 0.220 0.240 0.380 OXYGEN, DIS- SOLVED (MG/L) 7.2 6.6 6.4 7.2 9.0 7.6 ALKA- LINITY WAT WH TOT FET FIELD MG/L AS CACO3 150 140 150 150 150 140 ARSENIC TOTAL (UG/L AS AS) 1 -- -- 1 -- -- OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 94 79 73 94 105 108 SULFIDE TOTAL (MG/L AS S) <0.5 -- -- <0.5 -- " BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) 100 -- -- <100 -- -- OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) <10 14 210 -- 21 12 SULFATE DIS- SOLVED (MG/L AS SO4) 16 -- -- -- -- 20 BORON, TOTAL RECOV- ERABLE (UG/L AS B) 50 -- -- 80 -- -- COLI- FORM, FECAL, 0.45 UM-MF (COLS./ 100 ML) 310 3800 260 K810 420 280 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 23 -- -- -- -- 31 CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- <1 -- -- STREP- TOCOCCI FECAL, (COLS. PER 100 ML) 780 K1100 460 200 K73 230 FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.30 -- -- -- -- 0.20 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) <1 -- -- 1 -- -- K = non-ideal count 126 RIO DE LA PLATA BASIN 50044000 RIO DE LA PLATA NEAR COMBRIO, PR—Continue WATER- QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE COPPER, TOTAL RECOV- ERABLE (UQ/L AS CO) IRON, TOTAL RECOV- ERABLE (UQ/L AS FB) LEAD, TOTAL RECOV- ERABLE (UQ/L AS PB) MANGA- NESE, TOTAL RECOV- ERABLE (UQ/L AS MN) MERCURY TOTAL RECOV- ERABLE (UQ/L AS HQ) SELE- NIUM, TOTAL (UQ/L AS SB) SILVER, TOTAL RECOV- ERABLE (UQ/L AS AQ) ZINC, TOTAL RECOV- ERABLE (UQ/L AS ZN) CYANIDE TOTAL (MQ/L AS CN) PHENOLS TOTAL (UQ/L) MBTHY- LENB BLUB ACTIVE SUB- STANCE (MQ/L) OCT 1993 13. .. DEC 01. .. JAN 1994 31. .. APR 07... JUN 14... AUG 03. .. 170 520 20 80 0.10 <0.10 10 <0.010 <0.010 0.03 0.02 RIO DE LA PLATA BASIN 127 50044830 RIO GOADIANA AT GOADIANA, PR LOCATION.--Lat 18°18'08", long 66°13'24" / Hydrologic Unit 21010005, at left bank downstream side of river, 1.3 mi (2.1 km) Bast of Plaza de Naranjito, 0.9 mi (1.4 km) west from intersection of roads 167 and 164 at km 8.9 and 2.9 mi (4.7 km) northwest from Represa Comerio. DRAINAGE AREA.--9.19 mi» (23.80 km2 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--July 1990 to current year. GAGE.—Water-stage recorder and crest-stage gage. Elevation of gage is 230 ft (70 m), from topographic map. REMARKS.--Records fair. Gage-height and precipitation satellite telemetry at station. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY OCT NOV DEC JAN FBB MAR APR MAY JUN AUG SEP 1 11 8.8 2 9.9 6.9 3 9.4 6.8 4 9.3 6.8 5 7.7 6.3 6 7.3 6.4 7 8.5 6.4 8 7.8 12 9 7.0 9.7 10 6.5 8.4 11 6.3 6.9 12 6.2 6.6 13 6.5 29 14 6.4 36 15 6.2 47 16 56 58 17 22 48 18 9.8 70 19 8.5 41 20 8.1 18 21 7.5 16 22 8.0 12 23 7.4 10 24 6.7 9.5 25 6.6 8.9 26 6.4 9.1 27 6.4 9.1 28 6.5 13 29 6.3 9.3 30 6.1 8.4 31 5.9 TOTAL 294.2 544.3 MEAN 9.49 18.1 MAX 56 70 MIN 5.9 6.3 AC-FT 584 1080 CFSM 1.03 1.97 IN. 1.19 2.20 STATISTICS OF MONTHLY MEAN MEAN 29.7 14.5 MAX 98.7 18.4 (WY) 1991 1993 MIN 4.51 7.32 (WY) 1992 1992 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN-DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE ANNUAL RUNOFF (AC-FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 8.1 7.8 7.5 10 8.7 7.5 7.2 7.2 6.6 6.2 6.3 6.1 6.0 7.1 6.1 5.7 5.6 13 7.7 7.7 5.6 5.0 4.8 4.5 4.4 4.8 8.7 7.3 5.0 4.7 4.4 207.3 6.69 13 4.4 411 .73 .84 DATA 14.9 27.5 1993 5.67 1992 FOR 6.8 5.8 4.5 5.4 5.7 5.1 4.9 4.7 4.7 4.9 10 6.7 5.4 5.3 4.8 5.0 5.6 5.2 5.2 13 7.0 6.7 5.6 5.2 4.9 4.9 4.7 5.0 5.2 4.6 4.3 176.8 5.70 13 4.3 351 .62 .72 FOR WATER 19.5 42.5 1992 5.70 1994 .6 .7 .5 .3 .5 .8 .4 .4 .2 .5 .2 .0 .0 .4 .6 4.0 3.9 3.8 4.1 3.6 3.4 3.4 3.5 3.8 3.6 3.5 84 18___ ___ --- 210.7 7.52 84 3.4 418 .82 .85 YEARS 1990 13.1 31.7 1991 6.39 1992 6.5 6.5 5.1 5.3 5.3 4.9 3.9 .0 .4 .4 .0 .4 .2 3.8 4.6 4.4 3.7 3.5 3.5 3.1 3.5 3.0 2.8 2.9 2.7 2.7 2.7 2.9 4.4 3.0 2.7 122.8 3.96 6.5 2.7 244 .43 .50 - 1994 9.06 13.7 1992 3.96 1994 1993 CALENDAR YEAR 8391. 23. 321 3. 3. 16640 2. 33. 58 9. 4. 6 0 May 2 6 Apr 2 8 Apr 1 50 97 1 8 2.6 2.7 2.5 2.6 28 7.3 3.7 3.3 3.0 5.4 8.0 30 5.3 8.1 10 7.5 16 7.7 5.1 4.4 3.9 3.5 3.3 3.1 3.2 3.2 17 4.7 41 5.8 --- 251.9 8.40 41 2.5 500 .91 1.02 3.1 2.7 2.6 2.3 2.3 2.3 2.2 2.1 2.1 2.2 2.2 2.0 2.1 1.9 1.9 1.9 6.5 2.9 2.0 1.9 1.9 1.7 1.7 1.6 1.7 1.6 1.5 1.6 1.4 1.5 1.5 66.9 2.16 6.5 1.4 133 .23 .27 1.6 1.6 1.6 1.5 1.3 2.5 1.5 1.4 1.3 1.4 1.4 1.5 1.4 1.4 1.6 1.8 1.9 1.9 1.6 1.3 1.1 1.2 1.1 1.3 1.2 1.6 1.5 1.4 1.2 1.6 --- 44.7 1.49 2.5 1.1 89 .16 .18 1.6 1.5 1.4 1.3 1.2 3.3 2.4 1.4 1.3 1.3 1.4 1.4 1.3 1.3 1.4 1.5 1.3 2.7 1.5 1.1 1.3 1.0 1.1 1.0 1.1 .98 1.1 1.5 1.4 1.2 1.6 44.88 1.45 3.3 .98 89 .16 .18 1.4 1.3 1.4 1.2 1.6 1.3 6.6 4.6 5.2 3.5 1.9 1.5 1.5 1.6 1.5 1.9 1.5 6.4 3.8 34 4.9 2.0 1.5 1.9 2.1 1.4 1.4 1.4 1.3 1.2 1.2 104.0 3.35 34 1.2 206 .37 .42 1.7 1.4 1.3 1.1 1.0 2.0 3.9 2.1 1.4 1.8 4.8 2.0 1.6 1.9 1.6 2.0 1.5 1.5 1.5 3.6 4.7 2.2 13 4.4 29 7.0 2.2 1.8 1.7 1.5 --- 107.2 3.57 29 1.0 213 .39 .43 , BY WATER YEAR (WY) 21.4 52.4 1993 8.40 1994 FOR 1994 2175. 5. 84 1. 766 7. 4320 . 8. 9. 4. 1. 31.5 87.2 1993 2.16 1994 WATER YEAR 68 96 Feb 27 98 Jul 26 1 Jul 20 Feb 27 05 Feb 27 65 81 3 0 4 7.90 19.5 1993 1.49 1994 10.9 23.5 1993 1.45 1994 WATER 15 24 5 536 1 6670 13 11390 1 23 29 6 2 6.91 9.53 1993 3.35 1994 YEARS 1990 - .7 .5 .96 Jan 5 .98 Jul 26 .1 Jul 20 Jan 5 . 3 6 Jan 5 .71 .24 .3 .7 10.1 21.2 1993 3.57 1994 1994 1993 1994 1992 1994 1994 1992 1992 128 RIO DE LA PLATA BASIN 50044830 RIO GUADIANA AT CUADIANA, PR—Continued WATER-QUALITY RECORDS PERIOD OF RECORD.-- Water years 1990 to current year. PERIOD OF DAILY RECORD.-- SUSPENDED-SEDIMENT DISCHARGE: August 01, 1990 to September 1994 INSTRUMENTATION.— USD-77 and automatic sediment sampler. REMARKS.— Sediment samples collected by a local observer on a weekly basis and during high flow events. EXTREMES FOR PERIOD OF DAILY RECORD.-- SEDIMENT CONCENTRATION: Maximum daily mean, 1,300 mg/L Oct. 16, 1990; Minimum daily mean, 1 mg/L few days. SEDIMENT LOADS: Maximum daily mean, 18,000tons (16,300tonnes) Jan. 05, 1992; Minimum daily mean, 0.00 ton (0.0 tonne) several days. EXTREMES FOR WATER YEAR 1994.— SEDIMENT CONCENTRATION: Maximum daily mean, 460 mg/L Feb. 27, 1994; Minimum daily mean, 1 mg/L few days. SEDIMENT LOADS: Maximum daily mean, 486tons (441 tonnes) Feb. 27, 1994; Minimum daily mean, <0.01 ton (<0.1 tonne) several days. SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) OCTOBER MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) NOVEMBER MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) DECEMBER 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 11 9.9 9.4 9.3 7.7 7.3 8.5 7.8 7.0 6.5 6.3 6.2 6.5 6.4 6.2 56 22 9.8 8.5 8.1 7.5 8.0 7.4 6.7 6.6 6.4 6.4 6.5 6.3 6.1 5.9 20 18 15 13 10 11 13 11 9 6 4 3 2 2 2 391 153 79 16 4 4 6 10 13 16 18 11 4 5 7 10 .55 .48 .40 .33 .21 .24 .31 .23 .18 .11 .06 .05 .04 .04 .04 273 11 2.2 .36 .08 .10 .13 .20 .24 .29 .32 .19 .07 .08 .12 .17 8.8 6.9 6.8 6.8 6.3 6.4 6.4 12 9.7 8.4 6.9 6.6 29 36 47 58 48 70 41 18 16 12 10 9.5 8.9 9.1 9.1 13 9.3 8.4 12 8 4 29 54 55 54 56 24 18 16 16 94 108 142 179 167 250 148 41 33 30 28 25 24 23 21 32 21 20 .30 .14 .07 .56 .91 .92 .95 1.9 .67 .40 .30 .28 16 13 20 32 39 70 20 2.1 1.4 .97 .74 .67 .57 .55 .52 1.9 .51 .46 8.1 7.8 7.5 10 8.7 7.5 7.2 7.2 6.6 6.2 6.3 6.1 6.0 7.1 6.1 5.7 5.6 13 7.7 7.7 5.6 5.0 4.8 4.5 4.4 4.8 8.7 7.3 5.0 4.7 4.4 20 19 19 24 21 20 20 18 15 15 15 10 4 13 12 7 5 30 14 19 12 8 3 2 1 1 20 13 3 2 2 .43 .40 .37 .72 .45 .39 .37 .35 .26 .25 .25 .17 .06 .28 .19 .11 .08 1.3 .47 .45 .19 .12 .04 .03 .02 .01 .79 .28 .04 <.01 .02 TOTAL 294.2 291.82 544.3 227.79 207.3 8.89 RIO DE LA PLATA BASIN 50044830 RIO GUADIANA AT GUADIANA, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CPS) (MG/L) (TONS/DAY) 129 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CPS) (MG/L) (TONS/DAY) JANUARY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL 6.8 5.8 4.5 5.4 5.7 5.1 4.9 4.7 4.7 4.9 10 6.7 5.4 5.3 4.8 5.0 5.6 5.2 5.2 13 7.0 6.7 5.6 5.2 4.9 4.9 4.7 5.0 5.2 4.6 4.3 176.8 13 10 10 13 9 7 7 8 6 4 24 6 5 7 7 7 7 7 8 40 16 17 16 15 15 17 16 38 41 34 22 ___ .30 .16 .11 .20 .16 .09 .10 .10 .06 .05 .85 .11 .07 .09 .09 .09 .10 .10 .12 2.0 .31 .33 .24 .21 .20 .21 .21 .53 .58 .43 .26 8.46 FEBRUARY .6 .7 .5 .3 .5 .8 .4 .4 .2 .5 .2 .0 .0 .4 .6 4.0 3.9 3.8 4.1 3.6 3.4 3.4 3.5 3.8 3.6 3.5 84 18 210.7 10 11 27 28 24 24 25 16 11 e 8 10 10 12 5 5 6 6 5 3 3 3 4 5 5 5 460 99 .12 .14 .33 .40 .36 .32 .31 .18 .13 .09 .10 .10 .10 .14 .07 .05 .06 .06 .05 .03 .03 .03 .05 .05 .05 .04 486 5.6 MEAN DISCHARGE (CPS) 6.5 6.5 5.1 5.3 5.3 4.9 3.9 .0 .4 .4 .0 .4 .2 3.6 4.6 4.4 3.7 3.5 3.5 3.1 3.5 3.0 2.8 2.9 2.7 2.7 2.7 2.9 4.4 3.0 2.7 MEAN CONCEN- TRATION (MG/L) MARCH 54 35 22 14 8 12 16 11 5 3 1 1 1 1 1 1 2 4 7 12 15 4 1 1 1 1 1 1 15 22 10 SEDIMENT DISCHARGE (TONS/DAY) .95 .63 .32 .19 .12 .15 .17 .13 .06 .04 .02 .02 .01 <.01 <.01 .02 .01 .03 .06 .10 .14 .03 .01 .01 .01 .01 .01 .01 .27 .19 .08 494.99 122.8 3.74 730 RIO DE LA PLATA BASIN 50044830 RIO GUADIANA AT GUADIANA, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CPS) (MG/L) (TONS/DAY) (CPS) (MG/L) (TONS/DAY) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL 2.6 2.7 2.5 2.6 28 7.3 3.7 3.3 3.0 5.4 8.0 30 5.3 8.1 10 7.5 16 7.7 5.1 4.4 3.9 3.5 3.3 3.1 3.2 3.2 17 4.7 41 5.8 251.9 APRIL 5 1 3 9 107 25 11 7 6 12 21 92 15 21 24 19 43 18 13 9 6 4 5 7 14 22 79 13 373 20 ___ MEAN DISCHARGE (CFS) MAY .03 <.01 .02 .06 31 .66 .10 .07 .05 .23 .59 15 .22 .58 .74 .40 4.2 .41 .18 .11 .07 .04 .05 .06 .12 .19 27 .17 325 .33 407.68 3.1 2.7 2.6 2.3 2.3 2.3 2.2 2.1 2.1 2.2 2.2 2.0 2.1 1.9 1.9 1.9 6.5 2.9 2.0 1.9 1.9 1.7 1.7 1.6 1.7 1.6 1.5 1.6 1.4 1.5 1.5 66.9 12 7 4 3 8 13 14 11 8 6 3 6 6 5 4 3 28 34 24 17 12 10 7 5 5 7 6 5 3 2 30 .11 .06 .03 .02 .05 .08 .08 .06 .05 .02 .01 .03 .04 .02 .01 <.01 .72 .29 .14 .10 .08 .04 .03 <.01 .03 .02 .03 <.01 <.01 <.01 .13 2.28 1.6 1.6 1.6 1.5 1.3 2.5 1.5 1.4 1.3 1.4 1.4 1.5 1.4 1.4 1.6 1.8 1.9 1.9 1.6 1.3 1.1 1.2 1.1 1.3 1.2 1.6 1.5 1.4 1.2 1.6 —— 44.7 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) JUNE 80 59 26 13 9 10 7 7 7 8 9 9 9 11 32 45 41 30 18 8 12 17 18 17 16 14 13 11 9 9 .35 .26 .10 .04 .03 .08 .04 .03 .02 .01 .04 .04 .05 .04 .15 .22 .19 .15 .09 .03 .05 .06 .06 .07 .06 .07 .05 .04 .02 .04 2.48 RIO DE LA PLATA BASIN 737 50044830 RIO GUADIANA AT GUADIANA, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TOMS/DAY), HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) AUGUST MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL YEAR 1.6 1.5 1.4 1.3 1.2 3.3 2.4 1.4 1.3 1.3 1.4 1.4 1.3 1.3 1.4 1.5 1.3 2.7 1.5 1.1 1.3 1.0 1.1 1.0 1.1 .98 1.1 1.5 1.4 1.2 1.6 44.88 2175.68 JULY 10 12 12 7 3 6 19 40 34 17 10 5 4 4 5 16 15 9 6 25 53 53 45 23 —— .02 .06 .04 .01 <.01 .07 .02 .01 .01 .01 .01 .01 .01 .07 .15 .14 .05 .10 .03 <.01 <.01 .01 .05 .04 .03 <.01 .08 .21 .21 .15 .11 1.65 1602.37 1.4 1.3 1.4 1.2 1.6 1.3 6.6 4.6 5.2 3.5 1.9 1.5 1.5 1.6 1.5 1.9 1.5 6.4 3.8 34 4.9 2.0 1.5 1.9 2.1 1.4 1.4 1.4 1.3 1.2 1.2 8 4 4 4 4 4 50 159 119 81 48 24 25 26 29 31 31 38 13 358 29 20 31 23 15 16 22 37 59 38 9 .03 <.01 <.01 <.01 <.01 <.01 2.4 2.1 1.6 .84 .24 .09 .10 .12 .11 .16 .11 .73 .15 96 .43 .11 .13 .13 .08 .07 .09 .14 .21 .14 .03 MEAN DISCHARGE (CFS) SI 1.7 1.4 1.3 1.1 1.0 2.0 3.9 2.1 1.4 1.8 4.8 2.0 1.6 1.9 1.6 2.0 1.5 1.5 1.5 3.6 4.7 2.2 13 4.4 29 7.0 2.2 1.8 1.7 1.5 MEAN CONCEN- TRATION (MG/L) iPTEMBER 4 4 4 4 3 3 12 35 26 18 20 20 13 14 12 9 6 4 2 9 14 8 40 13 163 187 89 17 5 5 SEDIMENT DISCHARGE (TONS/ DAY) .01 .01 .01 .01 .01 .01 .36 .22 .09 .10 .29 .12 .07 .08 .06 .04 .02 <.01 <.01 .13 .21 .06 4.5 .19 35 4.0 .60 .07 .02 .01 104.0 106.34 107.2 46.25 732 RIO DE LA PLATA BASIN 50044830 RIO GUADIANA AT GUADIANA, PR—Continued WATER QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 SILT AND CLAY PERCENT OF SUSPENDED SEDIMENT DATE OCT 1993 16.. . JAN 1994 26.. . APR 29... AUG 10... 18... SEP 26... TIME 2005 1555 1430 1412 1656 1401 STREAM- FLOW, INSTAN- TANEOUS (CFS) 247 4.9 335 79 60 5.1 SEDI- MENT, SUS- PENDED (MO/L) 2830 219 5470 3.4 20 175 SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) 1890 2.9 4950 0.7 3.2 2.4 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .062 MM 97 98 94 96 96 99 733 RIO DE LA PLATA BASIN 50044850 RIO GUADIANA NEAR NARANJITO, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°18'39", long 66°13'28", at steel-cross-bridge 0.8 mi (1.3 km) northwest of Highway 164, 1.2 mi (1.9 km) upstream from mouth and about 2.0 mi (3.2 km) northeast of Naranjito plaza. DRAINAGE AREA.—4.0 mi 3 (10.3 km2 ). PERIOD OF RECORD.—Water year 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE OCT 1993 13... DEC 01... JAN 1994 31... APR 07... JUN 14... AUG 03... DATE OCT 1993 13... DEC 01... JAN 1994 31... APR 07... JUN 14... AUG 03... DATE OCT 1993 13... DEC 01... JAN 1994 31... APR 07... JUN 14... AUG 03... DIS- PH OXYGEN, OXYGEN COLI- CHARGE, SPE- WATER DIS- DEMAND, FORM, STREP- HARD- INST. CIFIC WHOLE SOLVED CHEM- FECAL, TOCOCCI NESS CUBIC CON- FIELD TEMPER- TOR- OXYGEN, (PER- ICAL 0.45 FECAL, TOTAL FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. (MG/L TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER AS SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) CACO3) 0925 0805 1025 1010 1300 1110 HARD- NESS NONCARB WH WAT TOT FLD MG/L AS CAC03 25 -- — 10 -- 13 SILICA, DIS- SOLVED (MG/L AS SI02) 28 — — 25 — 28 9.0 6.2 6.1 5.1 1.5 1.1 CALCIUM DIS- SOLVED (MG/L AS CA) 29 — — 22 -- 35 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 199 — -- 163 — 237 252 338 355 340 377 405 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 14 — -- 12 — 15 SOLIDS, DIS- SOLVED (TONS PER DAY) 4.83 — -- 2.24 — 0.68 8.2 7.2 8.1 7.9 7.6 8.1 SODIUM, DIS- SOLVED (MG/L AS NA) 15 -- -- 13 — 28 RESIDUE TOTAL AT 105 DEG. C, SUS- PENDED (MG/L) 14 9 21 10 1 11 26.5 3.0 26.0 2.0 22.0 2.5 25.0 1.4 28.5 0.90 30.0 0.30 SODIUM POTAS- AD- SIUM, SORP- DIS- TION SOLVED RATIO (MG/L AS K) 0.6 2.4 — — 0.6 2.3 — 1 2.8 NITRO- GEN, AM- MONIA + PHOS- ORGANIC PHORUS TOTAL TOTAL (MG/L (MG/L AS N) AS P) 0.40 0.160 <0.20 0.140 0.30 0.270 0.40 0.240 0.30 0.340 0.30 0.450 8.7 7.4 4.8 7.8 8.2 8.2 ALKA- LINITY WAT WH TOT FET FIELD MG/L AS CACO3 120 110 130 82 130 120 ARSENIC TOTAL (UG/L AS AS) 1 — — 1 — — 108 <10 K7000 90 <10 54 <10 230 420 94 <10 K1400 105 <10 K1000 108 <10 SULFATE SULFIDE DIS- TOTAL SOLVED (MG/L (MG/L AS S) AS S04) <0.5 14 — — <0.5 17 __ 20 BARIUM, BORON, TOTAL TOTAL RECOV- RECOV- ERABLE ERABLE (UG/L (UG/L AS BA) AS B) 100 20 — — <100 40 — — 2100 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 20 -- -- 15 — 36 CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 — — <1 __ — 820 71 650 270 320 100 2700 780 150 FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.20 — — 0.20 __ 0.20 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) <1 — — <1 -- -- K = non- ideal count 134 RIO DE LA PLATA BASIN 50044850 RIO GUADXANA NEAR NARANJITO, PR—Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE COPPER, TOTAL RECOV- ERABLE (U6/L IRON, TOTAL RECOV- ERABLE (U6/L LEAD, TOTAL RECOV- ERABLE (U6/L MANGA- NESE, TOTAL RECOV- ERABLE (U6/L MERCURY TOTAL RECOV- ERABLE (UG/L SELE- NIUM, TOTAL (UG/L SILVER, TOTAL RECOV- ERABLE (UG/L ZINC, TOTAL RECOV- ERABLE (UG/L CYANIDE TOTAL (MG/L PHENOLS TOTAL METHY- LENE BLUE ACTIVE SUB- STANCE OCT 1993 13... DEC 01... JAN 1994 31... APR 07... JUN 14... AUG 03... AS CU) AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) <10 220 <10 210 20 0.10 40 <0.10 10 <0.010 <0.010 2 0.02 <0.02 RIO DB LA PLATA BASIN 135 50045000 LAGO LA PLATA AT DAMSITE, PR LOCATION.--Lat 18°20'40", long 66°14'10", Hydrologic Unit 21010005, 2.9 ml (4.7 km) at northeast of Plaza de Naranjito, 2.7 ml (4.3 km) West of Road 167, km 15.3, Buena Vista, Bayamon, 5.2 mi (8.4 km) east of Plaza de Corozal. DRAINAGE AREA.--181 mi> (469 km 1 ). ELEVATION RECORDS PERIOD OP RECORD.--February 1989 to current year. GAGE.--Water-stage recorder. Datum of gage is mean sea level. REMARKS.--Lago La Plata first construction phase was completed in 1974 and the second construction phase to provide the spillway with bascule gates was completed in October 1989. The maximum storage is 37,000 ac-ft (45.6 hm3 ) and its purpose is the supply of water for domestic and industrial use. La Plata Dam is a concrete gravity structure located across the Rio de la Plata, the dam has an overall length of 774 ft (236 m) and a maximum height of about 131 ft (40 m) . The dam spillway is provided with 6 bascule gates. The spillway crest has a total clear length of 690 ft (210 m), an elevation of 155 ft (47 m). The Dam is owned and operated by Puerto Rico Aqueduct and Sewer Authority. Gage-height and precipitation satellite telemetry at station. EXTREMES OBSERVED FOR PERIOD OF RECORD.--Maximal 108.52 ft (33.07 m) , Sept. 12,1994. elevation, 167.02 ft (50.91 m), Jan. 5, 1992; minimum elevation. EXTREMES FOR CURRENT YEAR.--Maximum elevation, 165.17 ft (50.34 m), Oct.l; minimum elevation, 108.52 ft (33.07 m), Sept. 12. Capacity Table (based on data from Puerto Rico Aqueduct and Sewer Authority) Elevation, in feet 98.43 131.24 154.60 Contents, in acre-feet 2,760 11,360 22,720 Elevation, in feet 164.05 170.61 175.52 Contents, in acre-feet 28,550 33,160 37,040 ELEVATION (FEET NGVD), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY OBSERVATION AT 24:00 VALUES OCT NOV DEC JAN APR JUN JUL AUG SEP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN MAX MIN 165.17 165.07 164.91 164.99 164.80 164.85 164.90 164.87 164.85 164.90 164.84 164.78 164.73 164.68 164.54 164.82 164.75 164.69 164.72 164.69 164.63 164.58 164.51 164.48 164.42 164.35 164.18 164.12 164.12 164.04 163.96 164.64 165.17 163.96 163.86 163.57 163.47 163.37 163.14 163.03 162.93 162.92 162.91 162.82 162.76 162.58 162.67 162.99 163.48 164.41 164.30 164.62 164.28 164.11 164.25 164.25 164.40 164.40 164.43 164.21 164.40 164.56 164.26 164.30 ___ 163.72 164.62 162.58 164.25 164.28 164.27 164.27 164.26 164.26 164.10 164.05 163.90 163.76 163.65 163.57 163.49 163.59 163.61 163.49 163.27 163.27 163.17 163.07 162.90 162.57 162.32 162.20 162.07 161.94 161.85 161.82 161.62 161.57 161.48 163.16 164.28 161.48 161.43 161.39 161.29 161.08 161.02 160.97 160.89 160.79 160.70 160.60 160.63 160.45 160.37 160.18 160.10 160.03 159.96 159.89 159.82 159.80 159.72 159.62 159.51 159.09 158.98 158.64 158.49 158.37 158.26 158.17 158.03 159.94 161.43 158.03 157.87 157.72 157.58 157.45 157.33 157.17 157.03 156.94 156.74 156.55 156.36 156.15 155.98 155.80 155.67 155.48 155.30 155.11 154.88 154.90 154.96 154.88 154.73 154.55 154.43 154.29 154.89 154.92 ___ ___ --- 155.92 157.87 154.29 154.90 155.01 155.04 154.94 154.80 154.64 154.45 154.26 154.07 153.89 153.69 153.49 153.31 153.11 152.92 152.73 152.60 152.38 152.14 151.93 151.69 151.44 151.21 150.99 150.73 150.51 150.24 150.00 149.82 149.55 149.28 152.57 155.04 149.28 149.02 148.80 148.54 148.23 148.19 148.09 147.90 147.67 147.39 147.21 147.09 147.30 147.22 147.14 147.05 146.90 146.77 146.57 146.30 146.08 145.79 145.53 145.23 144.93 144.65 144.36 145.09 145.09 146.03 145.87 --- 146.73 149.02 144.36 145.62 145.36 145.09 144.83 144.54 144.25 144.01 143.72 143.42 143.09 142.82 142.66 142.41 142.11 141.81 141.51 141.27 141.22 140.87 140.58 140.27 139.96 139.68 139.33 139.06 138.72 138.53 138.28 138.11 137.84 137.61 141.57 145.62 137.61 137.30 137.04 136.78 136.47 136.21 135.93 135.70 135.35 135.08 134.83 134.45 134.19 133.93 133.56 133.32 133.03 132.73 132.56 132.38 132.06 131.76 131.46 130.67 130.74 130.42 130.08 129.83 129.72 129.50 129.16 --- 133.21 137.30 129.16 128.89 128.55 128.30 127.95 127.63 127.31 127.04 126.63 126.32 125.88 125.53 125.08 124.69 124.20 123.81 123.33 122.94 122.72 122.41 122.26 121.99 121.69 121.39 121.10 120.77 120.48 120.17 119. 90 119.59 119.26 118.99 123.77 128.89 118.99 118.66 118.28 117.93 117.60 117.23 116.83 116.56 116.23 116.03 115.76 115.41 115.06 114.74 114.44 114.08 113.72 113.27 A 112.89 A 113.12 112.97 112.71 112.53 112.39 112.08 111.87 111.75 111.60 111.32 110.99 ___ --- --- A 110.50 110.13 109.75 109.36 109.08 109.10 109.05 108.99 108.73 108.78 108.69 109.07 109.08 109.05 108.97 109.49 109.52 109.40 110.82 114.82 115.80 116.40 116.41 116.83 116.79 116.70 116.58 116.52 116.40 --- __. --- --- A No gage-height record 136 RIO DB LA PLATA BASIN 50045010 RIO DB LA PLATA BELOW LA PLATA DAM, PR LOCATION.--Lat 18°20'45", long 66<>14'17", Hydrologic Unit 21010005, 2.8 mi (4.5 km) west of Road 167, km 15.3, Buena Vista, Bayamdn, 5.0 mi (8.0 km) east of Plaza de Corozal, 3.0 mi (4.8 km) northeast of Plaza de Naranjito. DRAINAGE AREA.--173 mi 1 (448 km 1 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--July 1989 to current year. GAGE.--Water-stage recorder. Elevation of gage is 164 ft (30 m), from topographic map. REMARKS.--Records poor. Regulation at all stages by Puerto Rico Aqueduct and Sewer Authority reservoir upstream from gage. Gage-height satellite telemetry at station. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY NOV DEC JAN FEB MAR APR MAY JUN SEP 1 86 3.1 2 162 64 3 125 5.5 4 2.5 4.7 5 68 53 6 3.0 6.1 7 2.3 4.8 8 22 4.6 9 2.9 4.0 10 2.6 36 11 2.5 6.9 12 2.3 47 13 2.2 9.4 14 2.0 8.7 15 28 7.8 16 44 340 17 198 473 18 98 531 19 5.0 869 20 20 317 21 15 248 22 4.1 171 23 3.7 2.2 24 3.5 26 25 3.8 3.3 26 3.5 130 27 48 3.6 28 4.6 3.1 29 4.1 142 30 3.5 4.2 31 3.3 --- TOTAL 975.4 3529.0 MEAN 31.5 118 MAX 198 869 MIN 2.0 2.2 AC-FT 1930 7000 CFSM .18 .68 IN. .21 .76 STATISTICS OF MONTHLY MEAN MEAN 281 97.0 MAX 1107 225 (WY) 1991 1993 MIN .048 .16 (WY) 1992 1992 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN- DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE ANNUAL RUNOFF (AC-FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 47 4.2 4.1 3.5 3.3 3.0 38 4.0 37 44 4.1 3.6 2.4 91 2.2 2.2 39 2.4 2.4 2.2 29 84 44 2.4 2.4 2.4 2.0 2.3 56 4.6 4.0 572.7 18.5 91 2.0 1140 .11 .12 DATA 52.9 161 1993 .14 1990 FOR 3.7 3.5 3.2 50 4.3 3.7 3.5 3.3 3.2 3.0 2.9 96 5.9 45 5.4 4.8 4.4 4.2 3.9 4.7 4.4 4.1 3.9 110 6.4 78 8.3 7.3 6.9 6.6 6.0 500.5 16.1 110 2.9 993 .09 .11 5.6 5.5 5.6 5.6 5.8 5.9 6.0 6.2 38 17 14 13 11 9.6 9.1 8.6 8.1 6.7 5.9 4.8 4.6 4.7 3.7 1.2 .58 .34 .85 6.4 ___ ___ --- 214.37 7.66 38 .34 425 .04 .05 FOR WATER YEARS 1989 357 1581 1992 .19 1990 52.9 222 1991 .27 1990 6.2 5.7 5.5 5.3 3.4 1.2 .48 .27 .13 .12 .09 .08 .05 .03 .03 .01 .01 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 28.60 .92 6.2 .00 57 .01 .01 - 1994 27.4 83.2 1990 .10 1992 1993 CALENDAR YEAR 57451 157 3680 114000 12 429 53 2 .24 Jul 11 .91 Apr 5 .95 Apr 1 .91 .37 .2 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .06 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 3.8 .10 --- 3.96 .13 3.8 .00 7.9 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 0.00 .000 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .01 .03 .01 --- 0.05 .002 .03 .00 .1 .00 .00 .00 .00 .05 .06 .02 .23 .12 .05 .03 .03 .01 .01 .01 .00 .00 .00 .00 .23 .12 .05 .03 .02 .02 .01 .01 .01 .00 .00 .01 .00 .01 1.14 .037 .23 .00 2.3 .00 .00 .01 .00 .00 .01 .01 .01 4.9 .59 1.1 .26 .01 .00 .00 .00 .00 .00 .00 2.5 .48 1.4 .34 .01 .00 .05 .06 .00 .00 .00 .00 .00 .00 11.74 .38 4.9 .00 23 .00 .00 .77 .21 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 1.5 .10 .00 .00 .00 .00 .01 .02 .03 .02 .01 .94 11 3.5 .69 .11 .03 .01 --- 18.95 . 63 11 .00 38 .00 .00 , BY WATER YEAR (WY) 55.2 231 1993 .13 1994 FOR 1994 5856. 16. 869 . t 2190 11. 11620 t 1. 32 196 494 1993 .000 1994 WATER YEAR 41 0 Nov 19 00 Mar 18 00 Mar 18 Dec 14 83 Dec 14 093 26 10 00 62.0 220 1993 .002 1994 89.9 384 1993 .037 1994 WATER 112 182 16 27400 127000 34 81300 8 202 1 23.0 104 1993 .020 1989 YEARS 1989 .0 Jan .00 Jul .00 Jul Jan .76 Jan .65 .82 .9 .00 204 1047 1989 .001 1991 - 1994 1992 1994 6 1992 14 1989 14 1989 5 1992 5 1992 RIO DE LA PLATA BASIN 50045010 RIO DE LA PLATA AT BELOW LA PLATA DAM, PR—Continued WATER-QUALITY RECORDS PERIOD OF RECORD.-- Water years 1990 to current year. PERIOD OF DAILY RECORD.-- SUSPENDED-SEDIMENT DISCHARGE: October 1969 to September 1994 INSTRUMENTATION.— Automatic sediment sampler and DH-48. REMARKS.-- Sediment samples were collected by field technician on regular visits. EXTREMES FOR PERIOD OF DAILY RECORD.-- SEDIMENT CONCENTRATION: Maximum daily mean, 2,160 mg/L Jan. 06, 1992; Minimum daily mean, 0 mg/L several days. SEDIMENT LOADS: Maximum daily mean, 362,000tons (328,OOOtonnes) Jan. 06, 1992; Minimum daily mean, 0.00 ton (0.00 tonne) several days. EXTREMES FOR WATER YEARS 1994.-- SEDIMENT CONCENTRATION: Maximum daily mean, 25 mg/L Nov. 10, 1993; Minimum daily mean, 0 mg/L several days. SEDIMENT LOADSt Maximum daily mean, 60tone (54 tonnes) Nov. 19, 1993; Minimum daily mean, 0.00 ton (0.00 tonne) several days. SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 137 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) OCTOBER MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) NOVEMBER DECEMBER 1 2 3 4 5 6 7 6 9 10 11 12 13 14 15 16 17 16 19 20 21 22 23 24 25 26 27 26 29 30 31 66 162 125 2.5 66 3.0 2.3 22 2.9 2.6 2.5 2.3 2.2 2.0 26 44 196 96 5.0 20 15 4.1 3.7 3.5 3.6 3.5 46 4.6 4.1 3.5 3.3 6 10 6 2 21 16 19 14 2 2 2 2 2 2 3 4 10 7 4 9 9 4 2 2 2 2 4 2 2 2 2 2.4 4.5 3.0 .02 26 .14 .12 4.3 .02 .02 .02 .02 .02 .01 .96 1.2 5.6 3.4 .05 1.7 1.7 .04 .02 .02 .02 .02 2.1 .03 .02 .02 .02 3.1 64 5.5 4.7 53 6.1 4.6 4.6 4.0 36 6.9 47 9.4 6.7 7.6 340 473 531 669 317 246 171 2.2 26 3.3 130 3.6 3.1 142 4.2 2 4 2 2 4 3 2 2 2 25 9 9 3 3 3 10 14 15 20 12 12 9 11 3 2 6 2 2 25 2 .02 3.4 .03 .02 2.7 .05 .03 .02 .02 7.9 .17 7.2 .07 .06 .06 11 19 26 60 10 9.1 5.5 .06 .66 .02 4.5 .02 .02 54 .02 47 4.2 4.1 3.5 3.3 3.0 36 4.0 37 44 4.1 3.6 2.4 91 2.2 2.2 39 2.4 2.4 2.2 29 64 44 2.4 2.4 2.4 2.0 2.3 56 4.6 4.0 3 2 2 2 2 2 3 2 3 5 2 2 2 17 2 2 3 2 2 2 3 4 3 2 2 2 2 2 3 2 2 3.2 .02 .02 .02 .02 .02 1.6 .02 1.4 4.1 .03 .02 .02 39 .02 .02 1.4 .02 .02 .02 .66 4.6 2.0 .02 .02 .02 .01 .02 2.3 .03 .02 TOTAL 975.4 57.71 3529.0 221.67 572.7 60.66 138 RIO DE LA PLATA BASIN 50045010 RIO DE LA PLATA BELOW LA PLATA DAM SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CPS) (MG/L) (TONS/ DAY) JANUARY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 IB 19 20 21 22 23 24 25 26 27 28 29 30 31 3.7 3.5 3.2 50 4.3 3.7 3.5 3.3 3.2 3.0 2.9 96 5.9 45 5.4 4.8 4.4 4.2 3.9 4.7 4.4 4.1 3.9 110 6.4 78 8.3 7.3 6.9 6.6 6.0 2 2 2 3 2 2 2 2 2 2 2 4 2 4 2 2 2 2 2 2 2 2 2 7 3 4 3 3 3 3 2 .02 .02 .02 2.6 .02 .02 .02 .02 .02 .02 .02 5.5 .04 2.2 .04 .03 .02 .02 .02 .03 .02 .02 .02 5.7 .05 4.7 .06 .06 .05 .04 .04 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CPS) (MQ/L) (TONS/DAY) MEAN DISCHARGE (CPS) FEBRUARY 5.6 5.5 5.6 5.6 5.8 5.9 6.0 6.2 38 17 14 13 11 9.6 9.1 8.6 B.l 6.7 5.9 4.9 4.6 4.7 3.7 1.2 .58 .34 .85 6.4 ___ ___ ___ 2 2 2 2 2 2 2 3 4 4 4 3 3 3 3 3 3 3 3 3 3 3 2 1 1 1 2 3 ___ ___ .04 .04 .04 .04 .04 .04 .04 .04 1.1 .18 .13 .11 .09 .07 .07 .07 .06 .05 .04 .04 .04 .04 .03 .00 .00 .00 .00 .04 6.2 5.7 5.5 5.3 3.4 1.2 .48 .27 .13 .12 .09 .08 .05 .03 .03 .01 .01 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) MARCH 3 3 3 3 3 3 3 3 3 3 2 2 2 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 .05 .04 .04 .04 .03 .01 .01 .01 .01 .01 .01 .01 .01 .01 .01 <.01 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 TOTAL 500.5 21.46 214.37 2.48 28.60 0.20 RIO DE LA PLATA BASIN 139 50045010 RIO DE LA PLATA BELOW LA PLATA DAM SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 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) (CPS) (MG/L) (TONS/DAY) 1 2 3 4 5 6 7 e 9 10 11 12 13 14 15 16 17 16 19 20 21 22 23 24 25 26 27 26 29 30 31 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .06 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 3.6 .10 ___ APRIL 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 MAY .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .04 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 JUNE .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .01 .03 .01 —— 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 TOTAL 3.96 0.04 0.00 0.00 0.05 0.00 140 RIO DE LA PLATA BASIN 50045010 RIO DE LA PLATA BELOW LA PLATA DAM SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL YEAR .00 .00 .05 .06 .02 .23 .12 .05 .03 .03 .01 .01 .01 .00 .00 .00 .00 .23 .12 .05 .03 .02 .02 .01 .01 .01 .00 .00 .01 .00 .01 1.14 5856.41 JULY 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 — MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) AUGUST .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 0.00 364.93 .01 .00 .00 .01 .01 .01 4.9 .59 1.1 .26 .01 .00 .00 .00 .00 .00 .00 2.5 .48 1.4 .34 .01 .00 .05 .06 .00 .00 .00 .00 .00 .00 11.74 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0 0 1 1 1 0 0 0 0 0 0 0 0 0 0 0 — .00 .00 .00 .00 .00 .00 .05 .01 <.01 .00 .00 .00 .00 .00 .00 .00 .00 .02 .01 .01 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 0.10 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) SEPTEMBER .77 .21 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 1.5 .10 .00 .00 .00 .00 .01 .02 .03 .02 .01 .94 11 3.5 .69 .11 .03 .01 —— 18.95 1 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0 0 1 3 2 1 0 0 0 ___ — .01 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .02 .01 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .12 .03 .00 .00 .00 .00 0.19 RIO DE LA PLATA BASIN 50045010 RIO DE LA PLATA BELOW LA PLATA DAM, PR—Continued WATER QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 SILT AND CLAY PERCENT OP SUSPENDED SEDIMENT 141 DATE OCT 1993 08.. . 1005 STREAM- PLOW, INSTAN- TANEOUS (CFS) SEDI- MENT, SUS- PENDED (MO/L) SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .062 MM 91 81 20 64 142 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*), excludes 8.2 mi 1 (21.2 km2 ) upstream from Lago Carite, flow from which is diverted to Rio Guamani. Area at site used prior to September 25, 1984, 200 mi 1 (518 km1 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--November 1959 (measurement only), January 1960 to current year. Prior to October 1984, published as Rio de la Plata at Toa Alta, PR; October 1984 to September 1988 published as 50046900. GAGE.--Water-stage recorder and crest-stage gage. Datum of gage is 9.15 ft (2.789 m) , above mean sea level. Prior to October, 1984, at site about 1.0 mi (1.6 km) upstream at mean sea level datum. REMARKS.--Records poor. Regulation at all stages by Puerto Rico Aqueduct and Sewer Authority reservoir upstream from gage. Gage-height and precipitation satellite telemetry at station. Flow affected by bridge construction about 1.0 mi (1.6 km) upstream from station. EXTREMES OUTSIDE PERIOD OF RECORD.--Approximate discharges and elevations of major floods, as pointed out by local residents are as follows: Sept. 13, 1928, 120,000 ft3 /s (3,400 mVs), gage height, 37.4 ft (11.40 m); June 16, 1943, 82,000 ft3 /s (2,322 m3 /s), gage height, 34.4 ft (10.48 m), at site 1.0 mi upstream and different datum. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY NOV DEC JAN MAR MAY JON JUL 1 40 32 2 88 54 3 90 43 4 106 25 5 83 41 6 39 39 7 32 24 8 39 26 9 31 38 10 24 41 11 23 37 12 22 42 13 21 49 14 20 76 15 32 136 16 44 272 17 105 408 18 94 261 19 43 778 20 35 236 21 40 123 22 37 137 23 28 51 24 29 34 25 27 37 26 28 55 27 41 52 28 43 28 29 29 72 30 27 59 31 27 --- TOTAL 1367 3306 MEAN 44.1 110 MAX 106 778 MIN 20 24 AC-FT 2710 6560 CFSM .22 .55 IN. .25 .62 STATISTICS OF MONTHLY MEAN MEAN 488 444 MAX 4813 2015 (WY) 1971 1985 MIN 35.1 31.0 (WY) 1974 1981 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN-DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE INSTANTANEOUS LOW FLOW ANNUAL RUNOFF (AC-FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 41 35 25 25 29 23 34 32 27 38 31 22 26 47 50 37 48 76 45 39 45 73 58 34 32 32 36 32 55 31 34 1192 38.5 76 22 2360 .19 .22 DATA 335 1352 1971 23.4 1992 FOR 57 e60 e45 e53 e38 24 24 24 28 28 66 57 44 32 40 28 31 27 27 37 36 30 27 55 55 46 46 26 21 18 18 1148 37.0 66 18 2280 .19 .21 FOR WATER 188 929 1992 16.9 1984 18 17 18 19 18 19 16 16 21 21 16 17 17 16 17 17 13 13 e!3 el4 el2 12 15 18 16 13 13 18 ___ ___ --- 453 16.2 21 12 899 .08 .08 YEARS 1960 130 409 1989 16.0 1983 12 18 16 14 13 13 13 13 15 14 15 14 13 14 14 14 13 15 14 13 15 13 16 14 14 14 13 15 15 19 16 444 14.3 19 12 881 .07 .08 - 1994 104 468 1969 8.31 1986 1993 CALENDAR YEAR 65097 178 3830 15 16 129100 12. 393 64 24 Apr 30 Apr 3 Apr 1 89 12 13 14 16 17 18 30 14 13 14 34 31 25 13 11 12 14 12 15 13 12 10 12 12 11 13 13 26 17 160 89 --- 704 23.5 160 10 1400 .12 .13 , BY WATER 195 722 1987 5.07 1984 21 14 13 13 12 13 12 16 13 16 16 20 20 16 15 16 18 21 22 16 14 14 12 12 12 13 12 12 13 13 13 463 14.9 22 12 918 . 07 .09 YEAR (WY) 365 1939 1985 7.63 1984 14 12 16 12 11 11 11 9.7 9.2 9.0 8. 8 9.9 10 10 11 11 12 12 9.4 9.6 9.9 10 12 12 10 12 15 17 23 14--- 353.5 11.8 23 8. 8 701 .06 .07 168 847 1970 11.4 1977 FOR 1994 WATER YEAR 11498.7 31.5 778 7.7 9.5 1400 7.40 22810 .16 2.14 52 18 11 Nov 19 Aug 4 Jun 8 Nov 19 Nov 19 17 28 22 16 11 22 16 16 10 10 11 11 11 10 11 12 13 11 12 11 9.3 9.0 9.6 11 11 12 11 11 12 16 17 409.9 13.2 28 9.0 813 .07 .08 151 690 1961 13.2 1994 WATER 259 824 31. 40000 2. 2. 118000 26. 2. 188000 1. 17 . 498 90 18 15 18 9.6 7.7 11 14 10 16 54 41 27 22 18 18 20 18 19 26 41 28 32 36 35 50 36 19 17 17 22 15 13 725.3 23.4 54 7.7 1440 .12 .14 255 1677 1979 16.5 1976 YEARS 1960 - ,5 Oct 9 ,7 Apr 17 ,9 Apr 15 Jan 5 ,39 Jan 5 ,2 Apr 25 ,30 ,65 37 44 25 16 14 18 21 21 17 16 20 19 21 69 28 22 15 13 13 14 16 18 16 33 165 134 38 20 16 14 --- 933 31.1 165 13 1850 .16 .17 315 1691 1960 19.2 1991 1994 1971 1994 1970 1984 1984 1992 1992 1984 e Estimated RIO DE LA PLATA BASIN 743 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 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 3 (539 km3 )/ exclude 8.2 mi * (21.2 km1 ) upstream from Lago Carite, flow from which is diverted to Rio Guamani. PERIOD OP RECORD.--Water years 1958 to current year WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE OCT 1993 15. .. DEC 13. .. FEB 1994 08. . . APR 26. .. JUN 16. .. AOG 10. . . DATE OCT 1993 15. . . DEC 13. .. PEB 1994 08. .. APR 26. .. JUN 16. .. AOG 10. . . DATE OCT 1993 15. . . DEC 13. .. PEB 1994 08. . . APR 26. . . JUN 16. .. AUG 10. .. K = non- TIME 1015 1115 1115 1115 1200 1200 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 12 12 -- 14 16 8.0 SOLIDS, DIS- SOLVED (TONS PER DAY) 5.59 17.9 -- 9.40 10.9 24.0 ideal count DIS- CHARGE, INST. CUBIC PEST PER SECOND 7.3 26 18.1 12 12 40 SODIUM, DIS- SOLVED (MG/L AS NA) 22 21 -- 29 28 18 NITRO- GEN, NO2+NO3 DIS- SOLVED (MG/L AS N) 0.750 0.500 -- 0.340 <0.050 0.220 SPE- CIFIC CON- DUCT- ANCE (US /CM) 465 441 470 485 539 363 SODIUM AD- SORP- TION RATIO 0.7 0.7 -- 0.9 0.8 0.6 NITRO- GEN, AMMONIA DIS- SOLVED (MG/L AS N) 0.230 0.010 -- 0.040 0.080 0.180 PH WATER WHOLE FIELD (STAND- ARD UNITS) 7.4 7.5 7.4 7.4 7.2 7.2 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 2.9 2.0 -- 2.3 2.0 4.9 NITRO- GEN, AMMONIA DIS- SOLVED (MG/L AS NH4) 0.30 0.01 -- 0.05 0.10 0.23 TEMPER- ATURE WATER (DEG C) 28.5 26.0 25.0 26.5 26.0 26.0 ALKA- LINITY WAT WH TOT PET FIELD MG/L AS CAC03 200 180 190 180 220 130 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.60 0.30 -- 0.30 0.40 0.50 TUR- BID- ITY (NTU) 1.0 0.70 -- 0.90 0.50 1.0 SULPATE DIS- SOLVED (MG/L AS SO4) 14 14 -- 16 14 17 PHOS- PHORUS TOTAL (MG/L AS P) 0.130 0.200 -- 0.150 0.110 0.120 OXYGEN, DIS- SOLVED (MG/L) 4.4 4.0 6.4 4.2 1.4 0.8 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 26 27 -- 36 39 24 PHOS- PHORUS DIS- SOLVED (MG/L AS P) 0.120 0.180 -- 0.170 0.100 0.070 COLI- PORM, FECAL, 0.45 UM-MF (COLS./ 100 ML) 520 210 2100 200 K64 K3900 PLUO- RIDE, DIS- SOLVED (MG/L AS P) 0.20 0.10 -- 0.10 0.20 0.20 PHOS- PHORUS ORTHO, DIS- SOLVED (MG/L AS P) 0.100 0.200 -- 0.150 0.100 0.060 STREP- TOCOCCI PECAL, (COLS. PER 100 ML) 490 3300 K20 K60 K110 410 SILICA, DIS- SOLVED (MG/L AS SIO2) 20 24 -- 18 21 12 PHOS- PHATE, ORTHO, DIS- SOLVED (MG/L AS PO4) 0.31 0.61 -- 0.46 0.31 0.18 HARD- NESS TOTAL (MG/L AS CACO3 ) 200 170 -- 200 230 150 SOLIDS, RESIDUE AT 180 DEG. C DIS- SOLVED (MG/L) 276 263 -- 290 337 223 ALUM- INUM, DIS- SOLVED (UG/L AS AL) 20 -- -- -- 10 20 CALCIUM DIS- SOLVED (MG/L AS CA) 62 50 -- 58 66 45 SOLIDS, SUM OP CONSTI- TUENTS, DIS- SOLVED (MG/L) 284 255 -- 283 319 209 BARIUM, DIS- SOLVED (UG/L AS BA) 58 -- -- -- 93 70 744 RIO DE LA PLATA BASIN 50046000 RIO DE LA PLATA AT HWY 2 NR TOA ALTA, PR—Continued (National stream-quality accounting network station) WATER-QDALITY DATA, HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE OCT 1993 15. .. DEC 13.. . FEB 1994 08.. . APR 26. . . JUN 16. .. AUG 10.. . DATE JUN 1994 16.. . MANGA- MOLYB- SELE- STRON- COBALT, IRON, LITHIUM NBSE, DENUM, NICKEL, NIUM, SILVER, TIUM, DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED (DG/L (DG/L (UG/L (UG/L (UG/L (DG/L (DG/L (OG/L (DG/L AS CO) AS FE) AS LI) AS MN) AS MO) AS NI) AS SB) AS AG) AS SR) <3 6 <4 73 <10 1 <1 <1.0 270 __ __ __ <3 14 6 52 <10 1 <1 <1.0 300 <3 33 <4 38 <10 1 <1 <1.0 160 PESTICIDE ANALYSES CHLOR- DI- DI- PCB, ALDRIN, DANE, DDD, DDE, DDT, AZINON, ELDRIN TIME TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (DG/L) (DG/L) (DG/L) (DG/L) (DG/L) (DG/L) (UG/L) (UG/L) 1200 <0.1 <0.010 <0.1 <0.010 <0.010 <0.010 <0.01 <0.010 ENDRIN HBPTA- METH- METHYL WATER HEPTA- CHLOR MALA- OXY- PARA- VANA- DIUM, DIS- SOLVED (DG/L AS V) 8 -- -- -- <6 <6 ENDO- SDLFAN, TOTAL (DG/L) <0.010 UNFLTRD ETHION, CHLOR, EPOXIDE LINDANE THION, CHLOR, THION, MIREX, DATE REC TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (DG/L) (UG/L) JUN 1994 16.. . <0.010 <0.01 <0.010 <0.010 <0.010 <0.01 <0.01 <0.01 <0 NAPH- THA- LENES, PARA- POLY- PER- TOX- TOTAL .01 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) (DG/L) (UG/L) JUN 1994 16.. . <0.01 <0.10 <0.1 <1 <0.01 <0.01 <0.01 <0.01 <0 PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT SED. SEDI- SDSP. MENT, SIEVE STREAM- SEDI- DIS- DIAM. FLOW, MENT, CHARGE, PERCENT INSTAN- SDS- SDS- FINER DATE TIME TANEODS FENDED FENDED THAN (CFS) (MG/L) (T/DAY) .062 MM OCT 1993 15... 1015 7.3 25 0.49 96 DEC 13... 1115 26 25 1.76 86 FEB 1994 08... 1115 18 59 2.87 71 APR 26... 1115 12 52 3.37 78 JON 16... 1200 12 52 3.37 ADG 10... 1200 40 29 3.13 91 .01 145 iLTO / w .u f TV* •218 J dl* f-a.nog* boundaries irvdef»rrr,inoi<' *^~/$l''' m i»m«%tone terrenes <*x ^i , .______.—————————— 047560 V~.-</* ,. t^^»T^'--y ^"^< "^•^ * - x. % ^"— CiD8> 047560 0476 EXPLANATION SURFACE-WATER STATION AND NUMBER QUALITY-OF-WATER STATION AND NUMBER • 220 WELL AND WELL NUMBER • 047550 LAKE-ELEVATION STATION 01 2 3 4 5 G KILOMETERS Figure 19.--Rio Hondo to Rio Puerto Nuevo basins. 146 RI° HONDO BASIN 50047530 RIO HONDO AT FLOOD CHANNEL NEAR CATANO, PR WATER-QUALITY RECORDS LOCATION.--Lat 18026'13", long 66°09'36", at Rio Hondo Channel, 800 ft (245 m) below junction with Rio Hondo, 0.9 mi (1.5 km) downstream from bridge on de Diego Expressway and 1.1 mi (1.8 km) above mouth. DRAINAGE AREA.--Indeterminate. PERIOD OP RECORD.—Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE NOV 1993 01. .. DEC 20. .. MAR 1994 08. .. MAY 06. .. JUN 30. .. ADG 31. .. DATE NOV 1993 01. .. DEC 20. .. MAR 1994 08. .. MAY 06. .. JUN 30. .. AUG 31... DATE NOV 1993 01. .. DEC 20. .. MAR 1994 08. .. MAY 06... JON 30... AUG 31... TIME 0945 0935 0800 0835 1020 0845 HARD- NESS TOTAL (MG/L AS CACO3) 2900 -- — 4100 -- 3900 SILICA, DIS- SOLVED (MG/L AS SI02) 6.5 -- -- 3.8 -- 1.5 DIS- CHARGE, INST. CUBIC FEET PER SECOND -- -- -- -- -- -- CALCIUM DIS- SOLVED (MG/L AS CA) 200 -- -- 280 -- 270 SOLIDS , SUM OP CONSTI- TUENTS, DIS- SOLVED (MG/L) 15200 -- -- 21800 -- 22800 SPE- CIFIC CON- DUCT- ANCE (US /CM) 21600 19600 31500 36000 24000 31500 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 580 -- -- 830 -- 790 RESIDUE TOTAL AT 105 DBG. C, SUS- PENDED (MG/L) 15 62 31 54 37 50 PH WATER WHOLE FIELD (STAND- ARD UNITS) 8.1 7.4 8.1 7.9 7.9 8.6 SODIUM, DIS- SOLVED (MG/L AS NA) 4900 -- -- 6800 -- 6700 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) -- 0.80 0.50 0.80 2.3 0.90 TEMPER- ATURE WATER (DEG C) 30.0 26.0 25.0 30.0 30.0 30.0 SODIUM AD- SORP- TION RATIO 40 -- — 46 — 47 PHOS- PHORUS TOTAL (MG/L AS P) — 0.130 0.100 0.120 0.330 0.100 TUR- BID- ITY (NTU) 4.2 8.0 1.0 5.7 5.6 0.50 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 180 -- -- 190 -- 210 ARSENIC TOTAL (UG/L AS AS) 1 -- -- 2 -- -- OXYGEN, DIS- SOLVED (MG/L) 2.2 1.0 5.4 3.0 2.0 3.1 ALKA- LINITY WAT WH TOT PET FIELD MG/L AS CACO3 140 120 160 160 140 140 BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) 100 -- — <100 — -- OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 29 12 64 39 26 41 SULPIDE TOTAL (MG/L AS S) <0.5 -- -- 1.4 -- "" BORON, TOTAL RECOV- ERABLE (UG/L AS B) 2100 -- -- 100 -- -- OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 310 430 460 780 380 550 SULPATB DIS- SOLVED (MG/L AS SO4) 1200 — -- 1600 -- 1700 CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <2 -- -- <1 -- -- COLI- PORM, FECAL, 0.45 UM-MF (COLS./ 100 ML) K9600 2700 200 3000 240000 K100 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 8000 -- -- 12000 -- 13000 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) <1 -- -- <1 -- -- STREP- TOCOCCI FECAL, (COLS. PER 100 ML) K100 K1100 100 1100 2000 K100 PLUO- RIDE, DIS- SOLVED (MG/L AS P) 1.8 -- -- 0.50 -- 0.50 COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) 40 — -- <10 -- -- K = non-ideal count RIO HONDO BASIN 50047530 RIO HONDO AT FLOOD CHANNEL NEAR CATANO, PR—Continued WATER-QOALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 147 DATE NOV 1993 01.. . DEC 20.. . MAR 1994 08.. . MAY 06.. . JUN 30.. . AUG 31.. . IRON, LEAD, TOTAL TOTAL RBCOV- RECOV- ERABLE ERABLB (UG/L (UG/L AS FE) AS PB) 290 <1 -- . __ 170 1 __ __ MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) 160 -- -- 330 -- -- MERCURY TOTAL RECOV- ERABLE (UG/L AS HG) <0.10 __ __ <0.10 -- -- SILVER, ZINC, SBLB- TOTAL TOTAL NIOM, RBCOV- RECOV- CYANIDE TOTAL ERABLE ERABLE TOTAL PHENOLS (UG/L (UG/L (UG/L (MG/L TOTAL AS SB) AS AG) AS ZN) AS CN) (UG/L) <1 <1 30 <0.010 <1 __ __ <1 <1 10 <0.010 <1 __ __ METHY- LBNB BLUE ACTIVE SUB- STANCE (MG/L) 0.10 -- -- <0.02 -- -- 148 RIO DE BAYAMON BASIN 50047550 IiAGO CIDRA AT DAMSITB 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 Bscuela Segunda Unidad de Bayamon. DRAINAGE AREA.--8.26 mi" (21.39 km»). ELEVATION RECORDS PERIOD OF RECORD.—January 1988 to current year. GAGE.--Water-stage recorder. Datum of gage is 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 m) and crest elevation 1,322 ft (403 m), is an ungated ogee crest located 131 ft (40 m) from the right abutment. This dam is owned by Puerto Rico Aqueduct and Sewer Authority. Gage-height and precipitation satellite telemetry at station. EXTREMES OBSERVED FOR PERIOD OF RECORD.--Maximum elevation 1,324.14 ft (403.60 m), July 11, 1993; minimum elevation 1,297.45 ft (395.46 m), July 28, 1994. EXTREMES OBSERVED FOR CURRENT YEAR.--Maximum elevation, 1,322.57 ft (403.12 m), Nov. 20; minimum elevation, 1,297.45 ft (395.46 m), July 28. DAY Capacity Table (based on data from Puerto Rico Electric Power Authority) Elevation, in feet 1,295 1,305 1,309 Contents, in acre-feet 860 1,970 2,610 Elevation, in feet 1,312 1,319 1,322 1,328 Contents, in acre-feet 3,100 4,400 5,200 6,920 ELEVATION (FEET NGVD), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY OBSERVATION AT 24:00 VALUES NOV JAN FBB SEP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN MAX MIN 1321.77 1321.75 1321.76 1321.74 1321.70 1321.70 1321.68 1321.62 1321.58 1321.54 1321.43 1321.32 1321.22 1321.12 1321.06 1321.12 1321.08 1321.02 1320.96 1320.88 1320.84 1320.80 1320.75 1320.72 1320.68 1320.64 1320.62 1320.58 1320.54 1320.50 1320.47 1321.14 1321.77 1320.47 1320.44 1320.40 1320.36 1320.34 1320.30 1320.26 1320.22 1320.32 1320.32 1320.27 1320.27 1320.24 1320.20 1320.30 1320.32 1321.37 1321.44 1322.35 1322.45 1322.57 A A A A A A A A A A --- ___ ___ ___ 1322 1322 1322 1321 1321 1321 1321 1321 1321 1321 1321 1321 1321 1321 1321 1321 1321 1321 1321 1321 1321 1321 A A A A A A A A A .19 .18 .11 .99 .88 .79 .76 .73 .73 .70 .67 .64 .60 .56 .53 .50 .46 .44 .41 .38 .31 .22 ___ ___ ___ 1321. 1320. 1320. 1320. 1320. 1320. 1320. 1320. 1320. 1320. 1320. 1320. 1320. 1320. 1320. 1320. 1320. 1320. 1320. 1320. 1319. 1319. 1319. 1319. 1318. 1318. 1318. 1318. 1318. 1318. 1318. 1319. 1321. 1318. 10 99 91 86 83 76 72 66 60 54 64 58 54 47 41 36 31 18 08 02 78 52 26 00 76 59 45 37 26 12 03 93 10 03 1317 1317 1317 1317 1317 1317 1317 1317 1317 1317 1316 1316 1316 1316 1316 1316 1316 1316 1315 1315 1315 1315 1315 1315 1315 1315 1315 1315 1316 1317 1315 .94 .85 .75 .65 .55 .44 .33 .23 .12 .02 .90 .80 .68 .66 .59 .54 .46 .38 .88 .95 .98 .88 .93 .90 .86 .80 .76 .94 ___ ___ --- .67 .94 .76 1316.08 A 1315.90 1315.74 1315.58 1315.38 1315.20 1315.00 1314.78 1314.58 1314.39 1314.25 1314.05 1313.95 1313.89 1313.81 1313.73 1313.63 1313.53 1313.43 1313.31 1313.15 1312.96 1312.77 1312.60 1312.43 1312.25 1312.06 1311.90 1311.76 1311.66 ___ ___ ___ 1311.54 1311.40 1311.28 1311.13 1311.02 1310.86 1310.74 1310.60 1310.38 1310.26 1310.20 1310.10 1309.96 1309.90 1309.84 1309.72 1309.64 1309.52 1309.40 1309.28 1309.10 1308.92 1308.68 1308.46 1308.26 1308.12 1307.94 1307.74 1307.50 1307.30 --- 1309.63 1311.54 1307.30 1307.08 1306.88 1306.68 1306.46 1306.26 1306.04 1305.80 1305.58 1305.36 1305.18 1305.00 1304.84 1304.68 1304.52 1304.40 1304.26 1304.12 1304.00 1303.84 1303.66 1303.48 1303.30 1303.12 1302.98 1302.86 1302.78 1302.68 1302.58 1302.44 1302.32 1302.20 1304.37 1307.08 1302.20 1302.06 1301.85 1301.52 1301.28 1301.02 1300.90 1300.80 1300.70 1300.60 1300.50 1300.40 1300.32 1300.22 1300.15 1300.11 1300.01 1300.03 1299.99 1299.91 1299.81 1299.73 1299.63 1299.51 1299.39 1299.29 1299.47 1299.41 1299.28 ___ ___ ___ ___ ___ 1299. 1298. 1298. 1297. 1297. 1297. 1297. 1297. 1297. 1297. 1297. 1297. 1297. 1297. 1297. _ - - 06 99 96 A A A A A A A A A A A A A A A A 76 74 70 67 62 58 54 50 45 57 71 84 __ -- -- 1297.98 1298.09 1298.16 1298.21 1298.26 1298.35 1298.41 1298.49 1298.56 1298.63 1298.69 1298.72 1298.76 1298.79 1298.80 1298.80 1298.81 1298.80 1298.78 1298.79 1298.82 1298.83 1298.80 1298.82 1298.87 1298.93 1298.97 1299.00 1299.02 1298.94 1298.83 1298.67 1299.02 1297.98 1298.75 1298.70 1298.62 1298.54 1298.45 1298.55 1298.67 1298.76 1298.85 1298.93 1299.05 1299.10 1299.24 1299.33 1299.45 1299.57 1299.71 1299.81 1299.87 A A A 1300.77 1300.92 1301.06 1301.16 1301.25 1301.35 1301.40 1301.43 --- ___ --- --- A No gage-height record RIO DB BAYAMON BASIN 149 50047560 RIO DB BAYAMON BELOW LAGO CIDRA, PR LOCATION.--Lat 18°12'04", long 66°08'26", Hydrologic Unit 21010005, 0.2 mi (0.3 km) downstream of Lago Cidra Dam on right bank, 2.1 mi (3.4 km) northwest of Plaza de Cidra. DRAINAGE AREA.--8.31 mi 1 (21.5 km 3 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--November 1990 to current year. GAGE.--Water-stage recorder. Elevation of gage is 1,279 ft (390 m), from topographic map. REMARKS.--Records poor. Regulation at all stages by Puerto Rico Aqueduct and Sewer Authority reservoir upstream from gage. Gage-height and precipitation satellite telemetry at station. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY NOV DEC JAN MAY JUN JUL AUG 1 10 5.1 2 10 5.1 3 10 5.1 4 10 4.8 5 9.9 5.3 6 9.9 5.2 7 9.7 5.2 8 9.5 5.8 9 9.3 5.4 10 9.0 5.2 11 18 5.4 12 17 5.3 13 17 5.2 14 14 5.4 15 9.4 5.6 16 9.4 e6.9 17 8.5 e2.5 18 8.5 e3.2 19 8.3 5.7 20 8.1 20 21 8.0 80 22 7.7 19 23 7.6 9.7 24 7.5 6.6 25 6.5 5.3 26 5.2 7.4 27 5.4 6.4 28 5.1 4.4 29 5.0 3.8 30 5.3 10 31 5.1 --- TOTAL 283.9 270.0 MEAN 9.16 9.00 MAX 18 80 MIN 5.0 2.5 AC-FT 563 536 CFSM 1.10 1.08 IN. 1.27 1.21 STATISTICS OF MONTHLY MEAN MEAN 15.6 27.4 MAX 20.5 41.2 (WY) 1992 1992 MIN 9.16 9.00 (WY) 1994 1994 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN-DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE ANNUAL RUNOFF (AC-FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 7.2 4.4 3.3 e4.0 e4.4 3.5 3.2 2.8 5.3 8.0 7.8 7.8 7.8 6.4 4.8 4.2 e2.7 e2.7 e2.7 e2.6 e2.6 e2.9 e3.6 e2.6 e2.6 e2.6 e2.8 e3.2 e3.5 e5.7 7.5 135.2 4.36 8.0 2.6 268 .52 .60 DATA 16.1 30.4 1992 4.36 1994 FOR 12 13 8.8 6.0 5.0 5.3 5.0 5.1 5.0 5.1 6.1 5.2 5.0 4.9 5.0 5.0 5.0 4.9 8.7 13 14 13 13 13 11 8.1 12 5.9 11 13 7.1 254.2 8.20 14 4.9 504 .99 1.14 7.0 7.0 6.9 7.1 7.1 7.0 7.1 7.1 7.0 7.0 7.0 6.9 6.8 6.7 6.7 6.5 6.6 6.4 13 15 6.8 6.4 6.3 6.3 6.0 6.2 6.1 6.7 ___ ___ --- 202.7 7.24 15 6.0 402 .87 .91 FOR WATER YEARS 1991 22.8 59.6 1992 8.20 1994 19.3 36.5 1991 7.24 1994 7.1 12 13 15 15 19 19 19 19 19 19 18 18 9.9 6.0 6.0 5.9 5.8 5.7 5.6 6.5 8.8 9.4 9.7 9.8 9.8 9.7 8.7 8.9 8.0 5.9 352.2 11.4 19 5.6 699 1.37 1.57 - 1994 16.9 23.7 1992 11.4 1994 1993 CALENDAR YEAR 4757.3 13.0 632 2.5 2.8 9440 1.57 21.27 18 8.2 3.6 Jul 11 Nov 17 Dec 20 6.1 5.9 6.0 6.0 6.0 6.6 6.6 6.5 11 7.8 5.8 6.3 6.3 6.5 6.8 6.8 6.9 7.1 7.5 7.4 10 11 14 13 11 10 10 11 10 10 --- 245.9 8.20 14 5.8 488 .99 1.10 9.9 10 9.9 9.9 9.8 9.8 9.3 9.5 9.5 7.1 5.6 5.2 4.9 5.0 4.8 .6 .6 .5 .4 .6 .5 .5 4.4 e2.7 e2.3 e2.3 e2.4 e2.5 e2.5 e2.4 e2.6 176.0 5.68 10 2.3 349 .68 .79 e2.5 e7.1 12 e8.3 7.8 e5.8 e2.6 e2.6 e2.6 e2.7 e2.7 e2.8 e2.7 e2.7 e2.5 2.5 2.5 2.3 2.5 2.5 2.4 2.5 2.4 2.4 2.5 2.5 2.6 2.5 2.4 2.2 --- 104.1 3.47 12 2.2 206 .42 .47 2.1 2.1 2.0 1.9 2.0 1.9 1.8 1.9 1.9 1.7 1.6 1.6 1.5 1.6 1.6 1.5 1.5 1.4 1.4 1.3 1.3 1.3 1.3 1.3 1.2 1.3 1.2 1.3 1.3 1.2 1.3 48.3 1.56 2.1 1.2 96 .19 .22 1.3 1.4 1.5 1.7 1.5 1.5 1.5 1.5 1.4 1.5 1.4 1.4 1.4 1.3 1.4 1.4 1.3 1.4 1.3 1.5 1.4 1.4 1.4 1.5 1.5 1.6 1.5 1.4 1.4 1.3 1.5 44.5 1.44 1.7 1.3 88 .17 .20 1.5 1.4 1.5 1.4 1.5 1.8 1.5 1.5 1.5 1.5 1.5 1.8 1.6 1.6 1.6 1.6 1.7 1.7 1.7 2.5 1.8 1.6 1.8 1.7 1.6 1.7 1.6 1.6 1.7 1.6 --- 49.1 1.64 2.5 1.4 97 .20 .22 , BY WATER YEAR (WY) 13.6 23.0 1992 8.20 1994 FOR 1994 2166 5 80 1 1 165 10 4300 9 11 5 1 8.03 12.2 1991 4.13 1993 WATER YEAR .1 .93 Nov 21 .2 Jul 25 .3 Jul 24 Nov 21 .53 Nov 21 .71 .68 .2 .5 12.2 17.8 1992 3.47 1994 18.1 39.6 1993 1.56 1994 WATER 15 24 5 981 1 2090 16 11180 1 25 29 11 2 14.1 27.5 1991 1.44 1994 YEARS 1991 - .4 .7 .93 Jan 6 . 60 Aug 6 .3 Jul 24 Jul 11 .56 Jul 11 .85 .19 .7 10.8 16.0 1991 1.64 1994 1994 1992 1994 1992 1992 1994 1993 1993 e Estimated 750 RIO DB BAYAMON BASIN 50047560 RIO DB BAYAMON BELOW LAGO CIDRA , PR—Continued WATER-QUALITY RECORDS PERIOD OF RECORD.-- Water year* 1991 to current year. PERIOD OF DAILY RECORD.— SUSPENDED-SEDIMENT DISCHARGE: November 1990 to September 1994 INSTRUMENTATION.-- DH-48 and automatic •edimeent •ampler. REMARKS.-- Sediment •ample* were collected by a field observer on a weekly basis and during high flow event*. EXTREMES FOR PERIOD OF DAILY RECORD.— SEDIMENT CONCENTRATION: Maximum daily mean, 3,670 mg/L Jan. 05, 1992; Minimum daily mean, 3 mg/L Nov. 27, 1993. SEDIMENT LOADS: Maximum daily mean, 9,830tons (8,920tonnes) Jan. 05, 1992; Minimum daily mean, 0.02 ton (0.02 tonne) Nov 27, 1993. EXTREMES FOR WATER YEAR 1994.-- SEDIMENT CONCENTRATION: Maximum daily mean, 399 mg/L Nov. 21, 1993; Minimum daily mean, 3 mg/L Nov. 27, 1993. SEDIMENT LOADS: Maximum daily mean, 142 ton* (129 tonne*) Nov. 21, 1993; Minimum daily mean, 0.02 ton (0.02 tonne) Nov. 21, 1993. SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAY 1 2 3 4 5 6 7 e 9 10 11 12 13 14 15 16 17 IB 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL 283.9 —— 33.73 270.0 —— 170.18 135.2 —— 15.54 MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) OCTOBER 10 10 10 10 9.9 9.9 9.7 9.5 9.3 9.0 18 17 17 14 9.4 9.4 8.5 8.5 8.3 8.1 8.0 7.7 7.6 7.5 6.5 5.2 5.4 5.1 5.0 5.3 5.1 35 50 35 35 35 35 35 61 56 44 35 29 27 25 24 21 21 34 57 76 87 92 95 95 75 54 40 27 19 14 13 .98 1.4 1.0 .98 .95 .96 .96 1.6 1.4 1.1 1.7 1.4 1.2 .98 .62 .57 .53 .79 1.3 1.7 1.9 1.9 2.0 2.0 1.4 .75 .60 .39 .26 .23 .18 NOVEMBER 5.1 5.1 5.1 4.8 5.3 5.2 5.2 5.8 5.4 5.2 5.4 5.3 5.2 5.4 5.6 e6.9 e2.5 e3.2 5.7 20 80 19 9.7 6.6 5.3 7.4 6.4 4.4 3.8 10 15 17 20 19 19 25 37 38 37 36 33 31 33 35 38 197 75 52 34 29 399 36 31 28 25 22 3 21 20 20 .20 .24 .27 .25 .33 .36 .54 .63 .54 .51 .52 .47 .48 .58 .60 e!2 e.51 e.46 .54 3.1 142 2.0 .79 .47 .30 .42 .02 .25 .20 .60 —— MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) DECEMBER 7.2 4.4 3.3 e4.0 e4.4 3.5 3.2 2.8 5.3 8.0 7.8 7.8 7.8 6.4 4.8 4.2 e2.7 e2.7 e2.7 e2.6 e2.6 e2.9 e3.6 e2.6 e2.6 e2.6 e2.8 e3.2 e3.5 e5.7 7.5 17 .34 22 .28 20 .19 21 e.24 22 e.26 22 .23 19 .17 22 .16 62 1.0 99 2.3 105 2.3 89 1.9 62 1.3 43 .74 40 .54 37 .44 43 37 25 15 15 16 16 15 15 20 14 14 12 22 .34 .28 .19 .11 .13 .11 .17 .09 .09 .15 .12 .12 .10 .38 36 .77 e Estimated RIO DE BAYAMON BASIN 151 50047560 RIO DE BAYAMON BELOW LAGO CIDRA , PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN MEAN CONCEN- SEDIMENT DISCHARGE THATION DISCHARGE (CPS) (MG/L) (TONS/DAY) JANUARY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 12 13 8.8 6.0 5.0 5.3 5.0 5.1 5.0 5.1 6.1 5.2 5.0 4.9 5.0 5.0 5.0 4.9 8.7 13 14 13 13 13 11 8.1 12 5.9 11 13 7.1 43 36 31 28 36 47 51 48 44 43 41 40 38 39 41 43 45 45 46 37 25 21 20 20 13 16 11 11 12 14 13 1.5 1.3 .72 .46 .49 .69 .71 .69 .62 .58 .73 .58 .53 .53 .59 .61 .63 .60 1.1 1.3 .96 .76 .70 .70 .41 .36 .36 .19 .40 .52 .30 MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) FEBRUARY 7.0 7.0 6.9 7.1 7.1 7.0 7.1 7.1 7.0 7.0 7.0 6.9 6.8 6.7 6.7 6.5 6.6 6.4 13 15 6.8 6.4 6.3 6.3 6.0 6.2 6.1 6.7 ___ ___ 17 22 25 22 19 18 19 24 24 26 28 28 30 33 35 37 38 39 31 16 10 17 16 13 18 27 27 23 ___ ___ .36 .45 .50 .45 .37 .36 .37 .48 .46 .51 .56 .52 .58 .62 .66 .68 .68 .71 1.0 .71 .17 .33 .29 .24 .31 .47 .45 .40 ___ ___ MARCH 7.1 12 13 15 15 19 19 19 19 19 19 18 18 9.9 6.0 6.0 5.9 5.8 5.7 5.6 6.5 8.8 9.4 9.7 9.8 9.8 9.7 8.7 8.9 8.0 5.9 16 12 17 19 18 18 15 19 18 19 16 17 18 15 15 14 12 15 15 16 16 14 14 15 14 12 14 15 15 20 16 .30 .40 .57 .77 .75 .95 .74 1.0 1.0 1.1 .89 .88 .95 .42 .24 .25 .22 .26 .26 .25 .29 .35 .41 .42 .40 .35 .38 .40 .39 .49 .27 TOTAL 254.2 20.62 202.7 13.69 352.2 16.35 752 RIO DE BAYAMON BASIN 50047560 RIO DE BAYAMON BELOW LAGO CIDRA , PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE T RAT I ON DISCHARGE DAY (CPS) (MG/L) (TONS/DAY) (CPS) (MG/L) (TONS/DAY) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 6.1 5.9 6.0 6.0 6.0 6.6 6.6 6.5 11 7.8 5.8 6.3 6.3 6.5 6.8 6.8 6.9 7.1 7.5 7.4 10 11 14 13 11 10 10 11 10 10 ___ APRIL 17 13 13 13 12 13 12 14 13 10 13 13 13 15 14 16 17 15 17 15 17 18 19 26 38 45 46 48 48 48 ___ MEAN DISCHARGE (CPS) MAY .29 .22 .28 .21 .21 .23 .20 .26 .44 .23 .21 .25 .24 .28 .29 .33 .35 .32 .38 .35 .48 .58 .78 .90 1.1 1.3 1.3 1.4 1.3 1.3 9.9 10 9.9 9.9 9.8 9.8 9.3 9.5 9.5 7.1 5.6 5.2 4.9 5.0 4.8 .6 .6 .5 .4 .6 .5 .5 .4 •2.7 «2.3 «2.3 «2.4 «2.5 «2.5 «2.4 «2.6 48 54 49 49 49 48 48 48 48 48 48 48 48 48 48 47 46 44 43 41 39 38 37 36 34 35 27 18 15 19 16 1.3 1.5 1.3 1.4 1.3 1.3 1.2 1.3 1.2 .93 .75 .69 .67 .69 .64 .59 .57 .52 .50 .52 .49 .48 .45 .26 .21 .23 .19 .11 .12 .15 .12 «2.5 •7.1 12 «8.3 7.8 «5.8 «2.6 «2.6 «2.6 «2.7 «2.7 «2.8 «2.7 «2.7 «2.5 2.5 2.5 2.3 2.5 2.5 2.4 2.5 2.4 2.4 2.5 2.5 2.6 2.5 2.4 2.2 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) JUNE 18 22 33 33 27 14 6 3 9 5 15 23 11 12 15 17 19 21 22 23 24 27 28 32 34 36 36 12 12 26 «. 14 «.47 • 1. 0 • .79 .61 «.27 «.05 «.03 «.06 «.03 • .11 «. 16 e.07 «.09 «.09 .11 .14 .13 .18 .14 .15 .20 .19 .22 .24 .25 .25 .07 .10 .17 TOTAL 245.9 16.01 176.0 21.68 104.1 6.51 « Estimated RIO DK BAYAMON BASIN 50047560 RIO DK BAYAMON BELOW LAGO CIDRA , PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 753 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) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL YEAR 2.1 2.1 2.0 1.9 2.0 1.9 1.8 1.9 1.9 1.7 1.6 1.6 1.5 1.6 1.6 1.5 1.5 1.4 1.4 1.3 1.3 1.3 1.3 1.3 1.2 1.3 1.2 1.3 1.3 1.2 1.3 48.3 2166.1 JULY 36 43 49 44 33 32 24 25 23 23 25 27 27 27 24 24 25 29 30 28 25 24 47 52 52 52 52 52 51 51 51 —— AUGUST .21 .23 .27 .21 .20 .17 .12 .14 .13 .13 .11 .10 .11 .11 .11 .09 .10 .11 .11 .10 .08 .07 .17 .18 .16 .17 .17 .19 .16 .17 .16 4.54 332.91 1.3 1.4 1.5 1.7 1.5 1.5 1.5 1.5 1.4 1.5 1.4 1.4 1.4 1.3 1.4 1.4 1.3 1.4 1.3 1.5 1.4 1.4 1.4 1.5 1.5 1.6 1.5 1.4 1.4 1.3 1.5 44.5 50 50 51 52 54 55 57 52 44 40 52 73 87 76 56 46 50 59 61 62 63 63 61 62 62 62 62 62 62 62 62 —— .18 .20 .21 .23 .23 .24 .23 .20 .16 .16 .20 .29 .32 .27 .22 .18 .18 .21 .22 .26 .25 .25 .23 .25 .25 .27 .24 .24 .23 .23 .25 7.08 SEPTEMBER 1.5 1.4 1.5 1.4 1.5 1.8 1.5 1.5 1.5 1.5 1.5 1.8 1.6 1.6 1.6 1.6 1.7 1.7 1.7 2.5 1.8 1.6 1.8 1.7 1.6 1.7 1.6 1.6 1.7 1.6 --- 49.1 62 62 62 62 62 62 62 62 62 62 62 62 62 62 57 52 50 49 49 48 49 49 49 50 44 39 34 32 31 29 —— .25 .23 .25 .23 .27 .30 .25 .25 .26 .26 .26 .30 .26 .26 .24 .24 .23 .22 .22 .33 .24 .22 .24 .23 .20 .19 .15 .14 .14 .12 6.98 154 RIO DE BAYAMON BASIN 50047560 RIO DE BAYAMON BELOW LAQO CIDRA , PR—Continued MATER QUALITY DATA, MATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 SILT AND CLAY PERCENT OP SUSPENDED SEDIMENT DATE OCT 1993 02... 27... DEC 11... OUL 1994 01... 23... SEP 27.. . TIME 1626 ieoe 1201 1630 1201 IS 15 STREAM- PLOW, INSTAN- TANEOUS (CPS) 9.8 5.4 e.o 2.3 1.4 1.5 SEDI- MENT, SUS- PENDED (MO/L) 133 7« 106 31 52 453 SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) 9.6 1.1 2.3 0.2 0.2 1.8 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .062 MM 90 67 90 90 86 €2 RIO OB BAYAMON BASIN 155 50047600 RIO OB BAYAMON NEAR AQUAS BUBNAS, 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 km'). PERIOD OF RECORD.--Hater years 1958-65, 1974 to current year. WATER-QUALITY DATA, HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE OCT 1993 12. .. DEC 03. . . PEB 1994 02. . . APR 18... JUN 15. .. AUG 22. .. DATE OCT 1993 12... DEC 03. . . FEE 1994 02. .. APR 18. .. JUN 15. .. AUG 22. .. DATE OCT 1993 12. .. DEC 03. .. FEE 1994 02. .. APR 18. .. JUN 15. .. AUG 22. .. TIME 1140 1120 1050 1130 1255 1245 HARD- NESS TOTAL (MG/L AS CAC03 ) 87 -- -- 110 -- 140 SILICA, DIS- SOLVED (MG/L AS SIO2) 21 -- -- 23 -- 37 DIS- CHARGE, INST. CUBIC FEET PER SECOND 38 22 18 15 6.4 5.5 CALCIUM DIS- SOLVED (MG/L AS CA) 20 -- -- 24 -- 31 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 140 -- -- 179 -- 211 SPE- CIFIC CON- DUCT- ANCE (US/CM) 240 276 268 280 310 336 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 9.0 -- -- 11 -- 14 SOLIDS, DIS- SOLVED (TONS PER DAY) 14.3 -- -- 7.51 -- 3.11 PH HATER WHOLE FIELD (STAND- ARD UNITS) 8.1 7.7 8.0 7.9 8.5 7.8 SODIUM, DIS- SOLVED (MG/L AS NA) 15 -- -- 19 -- 15 RESIDUE TOTAL AT 105 DBG. C, SUS- PENDED (MG/L) 4 2 5 5 2 4 TEMPER- ATURE HATER (DBG C) 25.0 23.0 21.5 24.0 25.0 27.0 SODIUM AD- SORP- TION RATIO 0.7 -- -- 0.8 -- 0.6 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) <0.20 0.30 <0.20 -- 0.20 0.20 TUR- BID- ITY (NTU) 21 4.7 1.5 0.50 0.50 2.4 POTAS- SIUM, DIS- SOLVED (MG/L AS R) 2.5 -- -- 2.4 -- 1.5 PHOS- PHORUS TOTAL (MG/L AS P) 0.010 0.030 0.030 -- 0.040 0.030 OXYGEN, DIS- SOLVED (MG/L) 7.1 4.6 4.6 7.0 8.8 9.6 ALKA- LINITY WAT WH TOT FBT FIELD MG/L AS CACO3 89 110 110 120 130 140 ARSENIC TOTAL (UG/L AS AS) <1 -- -- <1 — -- OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 86 54 52 85 109 123 SULFIDE TOTAL (MG/L AS S) <0.5 -- -- <0.5 -- "" BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 -- -- <100 -- -- OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 14 14 <10 <10 12 13 SULFATE DIS- SOLVED (MG/L AS S04) 4.4 -- -- 8.9 -- 8.4 BORON, TOTAL RECOV- ERABLE (UG/L AS B) 30 -- -- 30 -- -- COLI- FORM, FECAL, 0.45 UM-MF (COLS./ 100 ML) K60000 K810 550 K20 K73 K50 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 15 -- -- 19 -- 20 CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- <1 -- -- STREP- TOCOCCI FECAL, (COLS. PER 100 ML) 230 510 1000 350 340 220 FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.20 -- -- 0.10 -- 0.10 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) <1 -- -- <1 — -- K = non-ideal count 156 RIO DE BAYAMON BASIN 50047600 RIO DE BAYAMON NEAR AQUAS BUENAS, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE OCT 1993 12. .. DEC 03. . . FEB 1994 02. .. APR 18. .. JUN 15. .. AUG 22. . . COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) <10 -- -- <10 -- -- IRON, TOTAL RECOV- ERABLE (UG/L AS FE) 1500 -- -- 90 -- -- LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) <1 -- -- 2 -- -- MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MM) 80 -- -- 20 -- -- MERCURY TOTAL RECOV- ERABLE (UG/L AS HG) 0.10 -- -- <0.10 -- -- SELE- NIUM, TOTAL (UG/L AS SB) <1 __ -- <1 -- -- SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) <1 -- -- <1 -- -- ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) <10 -- -- <10 -- -- CYANIDE TOTAL PHENOLS (MG/L TOTAL AS CN) (UG/L) <0.010 <1 __ __ <0.010 <1 __ __ MBTHY- LENE BLUE ACTIVE SUB- STANCE (MG/L) <0.02 — -- <0.02 -- -- RIO DE BAYAMON BASIN 50047850 RIO BAYAMON NR BAYAMON, PR LOCATION.--Lat 18°20'08 M , long 66°08'13", Hydrologic Unit 21010005, on left bank, at rock quarry near Highway 174, 1.3 mi (2.1 km) south of colonia Santa Rosa and 4.7 mi (7.6 km) south of Bayamon. 757 DRAINAGE AREA.--41.8 ml 1 (108.3 km 2 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--September 1964 to October 1970, June 1988 to current year. GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 98 ft (30 m), from topografic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. 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 La go de Cidra (capacity 5,220 acre-ft), 10.5 mi (16.9 km) upstream. Gage-height and precipitation satellite telemetry at station. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR JUN AUG SEP 1 14 e!6 2 16 ell 3 22 10 4 21 10 5 15 10 6 21 10 7 e!5 10 8 e!6 15 9 e!4 13 10 e!3 12 11 e!3 11 12 e!2 10 13 e!2 16 14 e!3 21 15 e!2 35 16 elOO 126 17 e45 71 18 e!5 149 19 e!4 98 20 e!3 38 21 e!2 102 22 e!3 44 23 e!2 23 24 e!2 18 25 e!2 17 26 11 18 27 11 e!7 28 11 e20 29 ell e!8 30 elO 16 31 elO TOTAL 541 985 MEAN 17.5 32.8 MAX 100 149 MIN 10 10 AC-FT 1070 1950 CFSM .42 .79 IN. .48 .88 STATISTICS OF MONTHLY MEAN MEAN 33.6 48.5 MAX 129 174 (WY) 1991 1970 MIN 4.30 7.91 (WY) 1969 1965 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN-DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE ANNUAL RUNOFF (AC-FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 17 16 15 e!9 e!7 15 14 13 13 e!4 e!3 13 13 15 13 11 12 17 13 12 12 13 13 12 12 12 15 18 15 15 14 436 14.1 19 11 865 .34 .39 DATA 46.2 263 1966 5.19 1968 FOR 15 17 15 15 15 14 14 14 13 13 20 14 14 14 15 15 14 12 11 13 12 15 15 14 13 12 11 13 12 12 12 428 13.8 20 11 849 .33 .38 FOR WATER 36.7 159 1969 5.30 1968 12 11 11 10 11 10 8.6 8.4 7.8 8.1 7.9 7.4 7.2 7.4 7.6 7.2 7.4 7.6 6.8 6.7 6.5 6.8 6.9 6.8 5.8 5.9 36 22___ ___ --- 267.8 9.56 36 5.8 531 .23 .24 YEARS 1964 21.8 75.3 1989 4.75 1965 13 12 10 9.1 7.3 7.4 7.3 6.7 7.4 7.3 6.7 6.7 6.5 7.0 6.3 7.3 6.8 6.2 6.9 6.7 6.6 6.5 5.8 5.6 5.6 5.5 5.5 4.9 7.2 6.0 5.3 219.1 7.07 13 4.9 435 .17 .19 - 1994 18.6 52.9 1990 3.58 1965 1993 CALENDAR YEAR 11108. 30. 314 9. 9. 22030 . 9. 73 16 11 6 4 Jul 24 2 Sep 3 3 Aug 30 73 89 5.2 5.1 4.8 4.9 8.4 11 6.0 5.9 5.5 17 10 20 7.6 8.8 8.5 7.6 13 8.1 5.9 5.9 5.8 5.4 4.8 4.4 4.1 4.6 57 34 7.2 6.2 302.7 10.1 57 4.1 600 .24 .27 5.2 5.0 4.7 4.5 5.4 5.1 5.2 5.3 5.0 5.8 6.0 5.8 5.9 5.9 5.9 5.8 5.6 5.7 5.5 4.9 4.8 4.2 3.9 3.9 3.8 3.5 3.4 3.5 3.8 3.6 3.7 150.3 4.85 6.0 3.4 298 .12 .13 3.6 4.7 4.1 3.4 3.3 3.6 3.5 3.3 3.4 3.6 3.6 3.5 3.5 3.5 3.4 3.4 4.1 4.5 4.0 3.6 3.3 3.2 2.9 3.2 3.3 4.2 4.5 4.0 4.0 4.1 --- 110.3 3.68 4.7 2.9 219 .09 .10 4.2 4.6 5.1 5.0 4.5 7.9 5.7 4.1 3.8 3.4 2.8 2.6 2.7 2.8 2.7 2.8 .2.8 14 6.2 3.4 3.1 3.0 2.9 2.9 2.9 2.8 2.9 3.2 3.2 3.2 3.2 124.4 4.01 14 2.6 247 .10 .11 3.4 3.2 3.0 3.6 3.7 3.8 4.7 11 15 6.2 7.0 3.3 3.2 3.6 4.1 4.9 5.8 12 28 11 4.1 3.7 3.2 13 17 7.6 6.2 15 10 6.0 5.4 231.7 7.47 28 3.0 460 .18 .21 10 10 8.6 6.5 5.1 5.9 6.2 5.4 4.6 4.5 6.8 5.6 5.1 5.1 5.0 5.5 5.2 4.7 4.7 6.1 7.6 7.5 8.0 24 8.2 5.6 4.6 4.3 4.3 4.1 --- 198.8 6.63 24 4.1 394 .16 .18 , BY WATER YEAR (WY) 23.1 72.7 1971 5.36 1965 FOR 1994 3995 10 149 2 2 677 5 7920 3 17 7 3 46.9 131 1966 4.85 1994 WATER YEAR .1 .9 Nov 18 . 6 Jul 12 .7 Jul 11 Nov 18 . 92 Nov 18 .26 .56 .3 .4 20.4 60.8 1970 3.68 1994 21.9 46.6 1970 4.01 1994 WATER 33 59 10 5500 2 2 28000 20 23920 10 59 13 4 41.0 137 1970 7.47 1994 YEARS 1964 .0 .7 .9 Oct .2 Apr .4 Apr Oct .20 Oct .79 .73 .7 40.0 146 1989 6.02 1967 - 1994 1966 1994 9 1970 19 1965 14 1965 9 1970 9 1970 e Estimated 158 RIO DE BAYAMON BASIN 50047990 RIO GDAYNABO NBAR BAYAMON, PR HATER-QUALITY RECORDS LOCATION.--Lat 18°22'32", long 66°07'59", at bridge on Highway 833, 0.2 mi (0.3 km) upstream from Rio de Bayamon, and 2.3 mi (3.7 km) southeast of Bayamon plaza. DRAINAGE AREA.--73.2 mi' (169.6 km3 ). PERIOD OF RECORD.--Water years 1958, 1964, 1971-73, 1976, 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE OCT 1993 27. .. DEC 09. .. FBB 1994 23. .. APR 11. . . JUN 10. . . ADG 02. .. DATE OCT 1993 27. .. DEC 09. .. FBB 1994 23. .. APR 11. .. JUN 10. .. ADG 02. .. DATE OCT 1993 27. . . DEC 09. . . FEB 1994 23. . . APR 11. . . JUN 10. . . ADG 02. .. TIME 1150 1045 1240 1010 0955 0650 HARD- NESS TOTAL (MG/L AS CAC03) 160 -- -- -- -- 150 SILICA, DIS- SOLVED (MG/L AS SI02) 34 -- -- -- -- 29 DIS- CHARGE, INST. CUBIC FEET PER SECOND 16 16 0.0 43 -- — - CALCIUM DIS- SOLVED (MG/L AS CA) 40 -- -- -- -- 40 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 244 -- -- -- -- 246 SPE- CIFIC CON- DUCT- ANCE (US/CM) 396 450 469 440 490 424 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 14 -- -- -- -- 11 RESIDUE TOTAL AT 105 DBG. C, SUS- PENDED (MG/L) 64 16 7 -- 1 10 PH WATER WHOLE FIELD (STAND- ARD UNITS) 8.0 7.8 7.3 7.3 7.4 7.2 SODIUM, DIS- SOLVED (MG/L AS NA) 24 -- -- -- -- 27 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.30 0.20 0.60 -- -- 1.4 TEMPER- ATURE WATER (DBG C) 29.0 24.5 24.0 25.0 27.0 27.0 SODIUM AD- SORP- TION RATIO 0.8 — -- — -- 1 PHOS- PHORUS TOTAL (MG/L AS P) 0.110 0.080 0.360 -- -- 0.380 TUR- BID- ITY (NTU) 2.0 3.6 0.60 -- 1.5 2.3 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 2.5 -- -- -- -- 3.8 ARSENIC TOTAL (UG/L AS AS) 1 -- -- 1 -- -- OXYGEN, DIS- SOLVED (MG/L) 8.9 8.2 4.7 4.4 3.6 1.4 ALKA- LINITY WAT WH TOT FBT FIELD MG/L AS CACO3 150 140 180 150 190 150 BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) 100 -- -_ 100 -- -- OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 115 98 55 52 44 17 SULFIDE TOTAL (MG/L AS S) <0.5 -- -- <0.5 -- "" BORON, TOTAL RECOV- ERABLE (UG/L AS B) 30 -- -- 50 -- -- OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 12 <10 18 -- 20 16 SULFATE DIS- SOLVED (MG/L AS SO4) 14 -- -- -- -- 9.2 CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- <1 -- -- COLI- FORM, FECAL, 0.45 UM-MF (COLS./ 100 ML) 33000 380000 3000 56000 K680 190000 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 25 -- -- -- -- 36 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) <1 -- -- <1 -- -- STREP- TOCOCCI FECAL, (COLS. PER 100 ML) 8000 69000 690 22000 400 36000 FLUO- RIDB, DIS- SOLVED (MG/L AS F) 0.20 -- -- -- -- 0.20 COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) <10 -- -- 10 -- -- K = non-ideal count RIO DE BAYAMON BASIN 50047990 RIO GUAYNABO NEAR BAYAMON, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 759 DATE OCT 1993 27.. . DEC 09... FBB 1994 23.. . APR 11.. . JUN 10.. . AUG 02... IRON, TOTAL RECOV- ERABLE (UG/L LEAD, TOTAL RECOV- ERABLE (UG/L MANGA- NESE, TOTAL RECOV- ERABLE (UG/L MERCURY TOTAL RECOV- ERABLE (UG/L SELE- NIUM, TOTAL (UG/L SILVER, TOTAL RECOV- ERABLE (UG/L ZINC, TOTAL RECOV- ERABLE (UG/L CYANIDE TOTAL (MG/L PHENOLS TOTAL MBTHY- LENE BLUE ACTIVE SUB- STANCE AS FE) AS PB) AS MN) AS HG) AS SB) AS AG) AS ZN) AS CN) (UG/L) 450 690 260 290 <0.10 <0.10 <0.010 <0.010 (MG/L) 0.02 0.04 160 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 from bridge on High- way 2, and 3.2 mi (5.1 km) above mouth. DRAINAGE AREA.--71.9 mi 1 (186.2km 1 ). PERIOD OF RECORD.--Water years 1974 to current year. ling site was 0.8 mile (1.3 km) downstream but was changed because of flood channel REMARKS.--Prior to 1979 s construction. WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE OCT 1993 27. .. DEC 09. . . MAR 1994 01. . . APR 11. . . JUN 10. .. AUG 02. . . DATE OCT 1993 27. . . DEC 09. .. MAR 1994 01. .. APR 11. . . JUN 10. . . AUG 02. . . DATE OCT 1993 27... DEC 09. . . MAR 1994 01. . . APR 11. . . JUN 10. . . AUG 02. .. TIME 1345 1315 1345 1200 0850 1045 HARD- NESS TOTAL (MG/L AS CACO3 ) 170 -- -- -- -- 150 SILICA, DIS- SOLVED (MG/L AS SI02) 32 -- -- -- -- 26 DIS- CHARGE, INST. CUBIC FEET PER SECOND 22 26 35 100 2.2 2.5 CALCIUM DIS- SOLVED (MG/L AS CA) 43 -- -- -- -- 40 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 244 -- -- -- -- 237 SPE- CIFIC CON- DUCT- ANCE (US/CM) 414 390 313 235 517 410 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 14 -- -- -- -- 11 SOLIDS, DIS- SOLVED (TONS PER DAY) 14.7 -- -- -- -- 1.57 PH WATER WHOLE FIELD (STAND- ARD UNITS) 7.7 7.8 8.3 7.1 7.4 7.1 SODIUM, DIS- SOLVED (MG/L AS NA) 23 -- -- -- -- 24 RESIDUE TOTAL AT 105 DBG. C, SUS- PENDED (MG/L) 27 22 54 -- 9 12 TEMPER- ATURE WATER (DBG C) 30.0 30.5 28.5 26.0 28.0 30.0 SODIUM AD- SORP- TION RATIO 0.8 — -- -- -- 0.9 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.30 -- 0.60 -- -- 0.60 TUR- BID- ITY (NTU) 18 3.7 33 -- 2.3 2.2 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 2.5 -- -- -- -- 3.4 PHOS- PHORUS TOTAL (MG/L AS P) 0.120 -- 0.190 -- -- 0.130 OXYGEN, DIS- SOLVED (MG/L) 9.1 8.3 6.0 5.6 4.2 3.4 ALKA- LINITY WAT WH TOT FBT FIELD MG/L AS CACO3 150 -- 120 77 200 140 ARSENIC TOTAL (UG/L AS AS) 1 -- -- <1 -- -- OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 120 109 77 68 53 44 SULFIDB TOTAL (MG/L AS S) <0.5 -- -- <0.5 -- BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) 100 -- -- <100 -- -- OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 13 11 22 -- 14 19 SULFATE DIS- SOLVED (MG/L AS SO4) 14 -- -- -- -- 19 BORON, TOTAL RECOV- ERABLE (UG/L AS B) 40 -- -- 30 -- -- COLI- FORM, FECAL, 0.45 UM-MF (COLS./ 100 ML) K600000 670000 36000 K72000 490 32000 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 25 -- -- -- -- 30 CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- <1 -- -- STREP- TOCOCCI FECAL, (COLS. PER 100 ML) K80000 140000 850 67000 430 110 FLUO- RIDB, DIS- SOLVED (MG/L AS P) 0.20 -- -- -- -- 0.10 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) 2 -- -- 5 -- -- K = non-ideal count RIO DB BAYAMON BASIN 50048510 RIO DB BAYAMON AT FLOOD CHANNEL AT BAYAMON, PR—Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 161 DATE OCT 1993 27. . . DEC 09. .. MAR 1994 01. .. APR 11. .. JUN 10. .. COPPER, TOTAL RECOV- ERABLE (UG/L AS CO) IRON, TOTAL RECOV- ERABLE (UG/L AS FB) LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) MERCURY TOTAL RECOV- ERABLE (UG/L AS HG) SELE- NIUM, TOTAL (UG/L AS SB) SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) CYANIDE TOTAL (MG/L AS CN) PHENOLS TOTAL (UG/L) METHY- LENE BLUB ACTIVE SUB- STANCE (MG/L) 10 20 1600 4800 340 260 <0.10 <0.10 10 40 <0.010 <0.010 0.02 0.08 PESTICIDE ANALYSES DATE JUN 1994 10. .. DATE JUN 1994 10... DATE CHLOR- DI- DI- ENDO- PCB, ALDRIN, DANE, DDD, DDE, DDT, AZINON, ELDRIN SULFAN, TIME TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) 0850 ENDRIN WATER UNFLTRD REC (OG/L) <0.010 PARA- THION, TOTAL (OG/L) <0.1 <C BTHION, TOTAL (OG/L) <0.01 NAPH- THA- LENES, POLY- CHLOR. TOTAL (OG/L) 1.010 HBPTA- CHLOR, TOTAL (OG/L) <0.010 PER- THANE TOTAL (OG/L) <0 * 1 < 0 HEPTA- CHLOR BPOXIDB TOTAL (OG/L) <0.010 TOX- APHENE, TOTAL (OG/L) .010 <0. LINDANB TOTAL (OG/L) <0.010 TOTAL TRI- THION (OG/L) ,010 <0. MALA- THION, TOTAL (OG/L) <0.01 2,4-D, TOTAL (OG/L) ,010 METH- OXY- CHLOR, TOTAL (OG/L) <o.ai 2,4,5-T TOTAL (OG/L) 0.01 <0. METHYL PARA- THION, TOTAL (OG/L) <0.01 2, 4-DP TOTAL (OG/L) 010 <0.010 MIRBX, TOTAL (OG/L) <0.01 SILVEX, TOTAL (OG/L) JUN 1994 10. .. <0.01 <0.10 <0.01 <0.01 <0.01 <0.01 <0.01 762 RIO PUERTO NDBVO BASIN 50048770 RIO PIEDRAS AT EL SBNORIAL, PR LOCATION.--Lat 18°21'51", long 66°03'56", Hydrologic Unit 21010005, on right bank, in the Riberas of Seftorial 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 1 (19.40 km1 ). WATER-DISCHARGE RECORDS PERIOD OF RECORDS.--March 1988 to current year. GAGE.--Hater-stage recorder. Elevation of gage is 98.4 ft (30.0 m), from topographic map. REMARKS.--Records poor. Low flow is affected by wastes water discharge from water treatment plant of PRASA and others dispersed pollution points directly to the river. Gage-height and precipitation satellite telemetry at station. DISCHARGE, CUBIC FEET PER SECOND, HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 6.3 4.5 2 4.8 12 3 4.2 5.7 4 149 6.1 5 17 5.5 6 26 5.2 7 9.6 5.4 8 7.7 32 9 6.7 13 10 6.3 6.4 11 5.5 6.4 12 4.9 6.3 13 4.9 25 14 5.3 23 15 5.1 75 16 13 101 17 43 27 18 9.3 20 19 9.5 12 20 13 6.6 21 8.8 5.7 22 7.7 5.3 23 .8 5.4 24 .3 6.6 25 .2 6.1 26 .1 9.2 27 .1 5.9 28 .0 7.0 29 .3 eS.l 30 5.3 e31 31 4.3 TOTAL 407.0 485.4 MEAN 13.1 16.2 MAX 149 101 MIN 4.0 4.5 AC-FT 807 963 CFSM 1.75 2.16 IN. 2.02 2.41 ell e6.4 e5.2 e4.7 e5.2 e4.4 e4.2 e!5 e4.5 e5.0 e5.6 5.3 5.0 5.8 5.9 6.3 5.4 41 7.0 13 4.8 5.3 3.9 3.9 4.4 4.2 8.9 7.7 5.5 6.6 4.9 226.0 7.29 41 3.9 448 .97 1.12 STATISTICS OF MONTHLY MEAN DATA MEAN 26.6 23.7 MAX 57.3 59.8 (WY) 1991 1993 MIN 8.48 7.51 (WY) 1992 1991 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN- DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE ANNUAL RUNOFF (AC-FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 16.3 40.5 1993 7.29 1994 FOR 7.8 8.7 5.9 4.5 4.6 4.8 5.0 4.2 5.0 4.5 50 7.8 5.4 5.1 5.4 8.1 5.4 4.4 4.6 6.2 7.4 11 37 6.6 4.9 4.6 8.9 5.8 15 4.8 4.7 268.1 8.65 50 4.2 532 1.15 1.33 5.1 5.5 5.2 5.6 4.7 4.9 5.0 5.0 5.2 5.3 4.9 5.0 4.3 5.4 4.7 4.4 4.4 4.0 e3.9 e4.2 e3.9 3.6 3.6 3.7 4.2 3.9 6.8 4.0 ___ ___ --- 130.4 4.66 6.8 3.6 259 .62 .65 FOR WATER YEARS 1988 15.7 24.4 1992 8.65 1994 11.9 23.6 1991 4.66 1994 4.9 4.8 3.8 3.4 3.4 3.9 3.7 3.6 3.7 4.3 3.3 3.4 3.4 3.4 3.2 3.5 3.5 3.3 3.7 3.7 3.3 3.3 3.3 3.2 3.5 3.4 3.5 3.7 3.8 4.3 3.8 113.0 3.65 4.9 3.2 224 .49 .56 - 1994 10.8 19.5 1990 3.65 1994 1993 CALENDAR YEAR 6178.9 16.9 359 3.1 4.1 12260 2.26 30.69 32 7.1 4.7 Jul 11 Mar 15 Mar 9 3.8 3.8 3.5 3.4 20 3.8 3.2 3.7 4.0 78 6.3 9.1 5.1 8.4 8.6 9.6 5.7 5.4 4.5 4.4 3.9 4.2 3.8 3.9 4.1 3.9 5.6 4.3 3.7 3.7 235.4 7.85 78 3.2 467 1.05 1.17 , BY WATER 14.4 23.9 1993 7.85 1994 3.6 3.6 3.5 3.4 4.0 3.4 11 4.8 3.2 5.6 3.0 2.8 2.8 2.7 2.9 2.7 2.5 3.1 2.5 3.1 3.0 2.1 2.5 2.8 2.3 2.2 2.1 7.4 2.2 2.0 2.1 104.9 3.38 11 2.0 208 .45 .52 YEAR (WY) 18.4 47.2 1992 3.38 1994 2.0 2.0 2.0 2.0 2.0 2.8 2.0 1.9 2.0 2.2 2.1 2.1 1.9 2.8 7.3 2.1 2.8 2.0 1.9 2.0 2.0 1.8 1.8 1.8 2.8 4.0 2.1 3.3 2.3 10 79.8 2.66 10 1.8 158 .36 .40 13.1 24.8 1989 2.66 1994 FOR 1994 WATER YEAR 2832.1 7.76 149 1.8 1.9 2130 11.42 5620 1.04 14.07 12 4.2 2.3 Get 4 Jun 22 Jun 18 Aug 28 Aug 28 3.3 34 3.5 2.8 2.6 12 2.5 2.7 2.3 2.5 2.3 2.4 2.8 2.9 2.6 8.4 2.7 3.7 2.6 3.7 2.2 2.8 2.9 3.2 2.8 2.1 2.2 1.9 3.0 1.9 3.6 130.9 4.22 34 1.9 260 .56 .65 17.4 38.0 1993 4.22 1994 WATER 17 24 7 621 1 1 4680 16 12850 2 32 38 7 3 3.6 2.5 3.0 3.3 5.8 2.4 4.9 56 3.8 3.7 2.6 2.6 2.3 4.1 1.9 2.2 e2.0 e4.3 23 3.6 2.3 4.0 55 23 4.5 2.9 3.8 133 9.9 4.9 3.5 384.4 12.4 133 1.9 762 1.66 1.91 24.2 66.9 1992 6.60 1990 YEARS 1988 - .7 .1 .76 Aug 21 .6 Apr 15 .9 Jun 18 Aug 24 .08 Aug 24 .37 .17 .9 .8 5.6 13 3.1 2.8 2.9 3.4 4.8 2.8 2.9 3.1 2.8 2.4 4.0 4.9 28 5.9 2.4 2.1 5.5 72 4.4 3.0 6.0 52 13 3.1 2.7 2.7 2.9 2.6 266.8 8.89 72 2.1 529 1.19 1.33 23.1 59.5 1989 6.90 1991 1994 1993 1994 1992 1992 1994 1988 1988 e Estimated RIO PUERTO NUEVO BASIN 50048770 RIO PIEDRAS AT EL SENORIAL, PR--Continued HATER-QUALITY RECORDS PERIOD OF RECORD.-- Water years 1988 to current year. PERIOD OF DAILY RECORD.-- SUSPENDED-SEDIMENT DISCHARGEi April 1988 to September 1994. INSTRUMENTATION.— USD-77 and automatic •ediment sampl0r. EXTREMES FOR PERIOD OF DAILY RECORD.-- SEDIMENT CONCENTRATIONi Maximum daily mean, 24,600 mg/L Sep. 18, 1989; Minimum daily mean, 2 mg/L November 18, 1988. SEDIMENT LOADSi Maximum daily mean, ell4,000tons (e!03,OOOtonne*) Sep. 18, 1989; Minimum daily mean, 0.02 ton (0.02 tonne) June 9, 1994. EXTREMES FOR HATER YEAR 1994.-- SEDIMBNT CONCENTRATION! Maximum daily mean, 4,150 mg/L Nov. 16, 1993; Minimum daily mean, 4 mg/1 Dec. 16, 1993. SEDIMENT LOADSi Maximum daily mean, 2,730 tons (2,460 tonnes) Oct. 04, 1993; Minimum daily mean, 0.02 ton (0.02 tonne) Jun. 09, 1994. 163 SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN DISCHARGE (CFS) 6.3 4.8 4.2 149 17 26 9.6 7.7 6.7 6.3 5.5 4.9 4.9 5.3 5.1 13 43 9.3 9.5 13 8.8 7.7 .8 .3 .2 .1 .1 .0 .3 5.3 4.3 MEAN CONCEN- TRATION (MG/L) OCTOBER 46 30 27 1830 202 1260 61 52 47 43 40 38 36 34 33 806 962 106 539 879 45 264 32 32 31 30 28 28 29 30 30 SEDIMENT DISCHARGE (TONS/DAY) .89 .39 .29 2730 16 210 1.7 1.1 .90 .73 .58 .50 .47 .49 .44 65 491 2.7 39 74 .70 13 .40 .37 .35 .32 .30 .30 .32 .43 .34 MEAN DISCHARGE (CFS) 4.5 12 5.7 6.1 5.5 5.2 5.4 32 13 6.4 6.4 6.3 25 23 75 101 27 20 12 6.6 5.7 5.3 5.4 6.6 6.1 9.2 5.9 7.0 «5.1 031 ___ MEAN CONCEN- TRATION (MO/L) NOVEMBER 29 543 41 40 39 37 35 1320 61 44 41 38 1260 2110 4000 4150 1390 781 61 45 45 45 45 45 45 287 39 37 35 34 ___ SEDIMENT DISCHARGE (TONS/DAY) .37 87 .64 .67 .57 .53 .49 308 2.2 .76 .74 .68 197 164 882 1260 190 79 2.2 .81 .70 .68 .66 .86 .78 24 .63 .67 • .48 «2.8 ___ MEAN DISCHARGE (CFS) 011 06.4 05.2 04.7 05.2 04.4 04.2 015 04.5 05.0 05.6 5.3 5.0 5.8 5.9 6.3 5.4 41 7.0 13 4.8 5.3 3.9 3.9 4.4 4.2 8.9 7.7 5.5 6.6 4.9 MEAN CONCEN- TRATION (MG/L) DECEMBER 34 34 32 31 31 29 28 27 25 22 18 15 12 8 6 4 11 2770 124 413 29 27 26 25 24 24 475 222 27 18 12 SEDIMENT DISCHARGE (TONS/DAY) 01.0 .58 .45 .39 .39 .34 .31 .1 .30 .31 0.24 .21 .17 .13 .10 .08 .16 489 7.9 55 .36 .39 .26 .27 .28 .28 29 12 .41 .36 .16 TOTAL 407.0 3653.01 485.4 3229.92 226.0 601.97 0 Estimated 1 fi A » ** •» RIO PUERTO NOEVO BASIN 50048770 RIO PIEDRAS AT EL SENORIAL, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN DISCHARGE DAY (CFS) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 7.8 8.7 5.9 4.5 4.6 4.8 5.0 4.2 5.0 4.5 50 7.8 5.4 5.1 5.4 8.1 5.4 4.4 4.6 6.2 7.4 11 37 6.6 4.9 4.6 8.9 5.8 15 4.8 4.7 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) JANUARY 309 64 30 30 30 30 29 29 28 26 2280 68 40 32 36 369 41 34 30 38 91 598 2850 52 31 29 325 44 685 32 32 MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) FEBRUARY 18 1.8 .47 .36 .38 .38 .39 .33 .36 .33 585 1.5 .61 .45 .76 25 .60 .40 .37 .86 2.4 62 1200 1.0 .40 .35 50 .80 103 .42 .40 5.1 5.5 5.2 5.6 4.7 4.9 5.0 5.0 5.2 5.3 4.9 5.0 4.3 5.4 4.7 4.4 4.4 4.0 *3.9 e4.2 «3.9 3.6 3.6 3.7 4.2 3.9 6.8 4.0 31 31 30 39 30 30 30 30 30 30 30 29 28 43 36 36 36 36 35 34 33 31 31 30 28 27 52 25 .42 .46 .43 .73 .38 .39 .40 .40 .42 .44 .39 .39 .33 .71 .47 .42 .42 .39 e.36 e.38 e.33 .31 .30 .30 .32 .28 2.2 .27 ___ MARCH 4.9 4.8 3.8 3.4 3.4 3.9 3.7 3.6 3.7 4.3 3.3 3.4 3.4 3.4 3.2 3.5 3.5 3.3 3.7 3.7 3.3 3.3 3.3 3.2 3.5 3.4 3.5 3.7 3.8 4.3 3.8 37 22 20 18 15 14 11 8 9 10 11 13 14 15 15 15 15 16 17 19 17 18 18 19 19 20 20 20 20 21 21 .76 .28 .20 .16 .14 .14 .11 .08 .09 .11 .10 .12 .12 .12 .12 .14 .13 .14 .18 .19 .16 .16 .16 .16 .19 .19 .20 .20 .20 .24 .21 TOTAL 268.1 —— 2059.12 130.4 —— 13.04 113.0 —— 5.50 e Estimated RIO PUERTO NDEVO BASIN 165 50048770 RIO PIBDRAS AT EL SENORIAL, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CPS) (MG/L) (TONS/DAY) (CPS) (MG/L) (TONS/DAY) (CPS) (MG/L) (TONS/DAY) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 3.8 3.8 3.5 3.4 20 3.8 3.2 3.7 4.0 78 6.3 9.1 5.1 8.4 8.6 9.6 5.7 5.4 4.5 4.4 3.9 4.2 3.8 3.9 4.1 3.9 5.6 4.3 3.7 3.7 APRIL 21 21 21 21 1010 40 35 28 21 517 35 73 31 62 75 179 39 34 34 34 34 32 31 31 30 29 41 30 30 28 MAY .21 .21 .20 .20 200 .45 .30 .27 .23 238 .57 3.3 .44 2.6 2.3 24 .61 .48 .42 .41 .36 .35 .31 .32 .35 .31 .88 .35 .30 .27 —— 3.6 3.6 3.5 3.4 4.0 3.4 11 4.8 3.2 5.6 3.0 2.8 2.8 2.7 2.9 2.7 2.5 3.1 2.5 3.1 3.0 2.1 2.5 2.8 2.3 2.2 2.1 7.4 2.2 2.0 2.1 27 26 25 23 22 20 325 36 26 253 73 41 23 19 18 16 15 21 14 14 14 14 13 13 13 13 12 357 15 15 15 .26 .24 .22 .21 .24 .19 88 .68 .22 19 .61 .30 .17 .13 .12 .12 .11 .26 .10 .12 .11 .07 .10 .11 .09 .08 .06 54 .10 .08 .08 JUNE 2.0 2.0 2.0 2.0 2.0 2.8 2.0 1.9 2.0 2.2 2.1 2.1 1.9 2.8 7.3 2.1 2.8 2.0 1.9 2.0 2.0 1.8 1.8 1.8 2.8 4.0 2.1 3.3 2.3 10 14 14 14 13 12 11 7 5 5 7 8 9 10 18 312 14 14 14 13 13 13 13 12 12 13 12 12 23 13 545 .08 .08 .07 .07 .06 .09 .04 .03 .02 .03 .04 .05 .05 .27 34 .08 .11 .07 .06 .06 .06 .07 .06 .06 .10 .14 .06 .41 .09 66 TOTAL 235.4 479.00 104.9 166.18 79.8 102.41 766 RIO PUERTO NUBVO BASIN 50048770 RIO PIEDRAS AT EL SENORIAL, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) 3.3 34 3.5 2.8 2.6 12 2.5 2.7 2.3 2.5 2.3 2.4 2.8 2.9 2.6 8.4 2.7 3.7 2.6 3.7 2.2 2.8 2.9 3.2 2.8 2.1 2.2 1.9 3.0 1.9 3.6 JULY 16 1160 17 15 17 436 16 16 15 15 15 15 15 15 15 305 16 15 15 14 13 13 13 12 11 10 10 10 19 14 14 TOTAL 130.9 —— YEAR • 2832.1 Estimated MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) AUGUST .14 382 .18 .12 .11 79 .10 .12 .10 .10 .10 .10 .12 .12 .11 41 .12 .14 .11 .15 .08 .10 .11 .10 .08 .04 .06 .05 .22 .07 .12 505.07 17613.98 3.6 2.5 3.0 3.3 5.8 2.4 4.9 56 3.8 3.7 2.6 2.6 2.3 4.1 1.9 2.2 •2.0 •4.3 23 3.6 2.3 4.0 55 23 4.5 2.9 3.8 133 9.9 4.9 3.5 384.4 14 14 14 14 132 13 240 1340 56 39 28 19 15 866 595 465 417 397 1280 26 15 28 1130 1300 46 30 77 1420 90 31 27 —— .14 .10 .11 .13 14 .07 16 802 .62 .38 .21 .13 .09 22 3.1 2.9 •2.3 •4.5 254 .27 .08 .58 851 171 .68 .23 4.9 2430 4.5 .40 .26 4586.68 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) SEPTEMBER 5.6 13 3.1 2.8 2.9 3.4 4.8 2.8 2.9 3.1 2.8 2.4 4.0 4.9 28 5.9 2.4 2.1 5.5 72 4.4 3.0 6.0 52 13 3.1 2.7 2.7 2.9 2.6 163 477 20 20 18 17 233 22 18 22 15 15 27 171 986 212 14 14 254 2480 29 22 41 1490 474 20 17 17 16 16 11 119 .17 .14 .14 .17 13 .17 .14 .27 .12 .09 .65 26 356 29 .09 .09 29 885 .37 .19 1.6 669 70 .18 .13 .12 .13 .12 266.8 2212.08 RIO PUERTO NUEVO BASIN 767 50048770 RXO PIEDRAS AT EL SENORXAL, PR--Continued MATER QUALITY DATA, MATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT DATE DEC 1993 18... JAN 1994 11. .. 11... 23... 23... JUIi 02... TIME 0415 0855 1255 1505 1605 1215 DIS- CHARGE, INST. CUBIC FEET PER SECOND 62 95 48 134 205 38 SEDI- MENT, SUS- PENDED (MO/L) 14670 7950 11310 14730 20760 7190 SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) 2460 204 1470 5330 11490 738 SED. SUSP. FALL DIAM. PERCENT FINER THAN .002 MM 50 42 35 29 30 43 SED. SUSP. FALL DIAM. PERCENT FINER THAN .004 MM 59 45 41 39 39 52 SED. SUSP. FALL DIAM. PERCENT FINER THAN .008 MM 61 64 56 47 50 66 DATE DEC 1993 18... JAN 1994 11... 11... 23... 23... JUL 02... SED. SUSP. FALL DIAM. PERCENT FINER THAN .016 MM 78 78 68 61 63 77 SED. SUSP. FALL DIAM. PERCENT FINER THAN .031 MM 87 86 81 76 75 84 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .062 MM 99 99 97 95 90 99 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .125 MM 99.7 99.8 99 99 97 99.7 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .250 MM 99.9 99.9 99.8 99.7 99 99.9 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .500 MM 100 100 99.9 99.9 99.9 100 BED. SUSP. SIEVE DIAM. PERCENT FINER THAN 1.00 MM 100 100 100 100 100 100 168 RIO PUERTO NOEVO BASIN 50048770 RIO PIEDRAS AT EL SENORIAL, PR--Continued HATER QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 SILT AND CLAY PERCENT OF SUSPENDED SEDIMENT DATE DEC 1993 30... JAN 1994 11... 23.. . APR 10... JUL 02... AUO 18... TIME 0335 0345 1725 0915 1135 1145 STREAM- FLOW, INSTAN- TANEOUS (CFS) 111 214 129 122 71 2.1 SEDI- MENT, SUS- PENDED (MG/L) 9650 5280 10100 3860 7980 404 SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) 2900 3050 3520 1270 1530 2.3 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .062 MM 96 81 93 68 98 98 769 RIO PUERTO NUBVO 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 176, and 2.5 mi (4.0 km) southwest of Rio Piedras plaza. DRAINAGE AREA.--8.17 mi 3 (20.9 km 1 ). PERIOD OF RECORD.--Water years 1972 to current year. WATER QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE OCT 1993 25. . . DEC 06. .. FBB 1994 22. .. MAY 01. .. JUN 13. .. AUG 08. .. DATE OCT 1993 25. . . DEC 06. .. FBB 1994 22. . . MAY 01. . . JUN 13. .. AUG 08. . . DATE OCT 1993 25. . . DEC 06. . . FEB 1994 22. . . MAY 01. .. JUN 13. .. AUG 08. .. TIME 1100 0950 1030 0835 0855 1050 HARD- NESS TOTAL (MG/L AS CAC03 ) 160 -- -- 160 -- 150 SILICA, DIS- SOLVED (MG/L AS SI02) 35 -- -- 31 -- 30 DIS- CHARGE, INST. CUBIC FEET PER SECOND 8.7 12 3.7 3.4 2.6 3.1 CALCIUM DIS- SOLVED (MG/L AS CA) 42 -- -- 44 -- 40 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 254 -- -- 263 -- 286 SPE- CIFIC CON- DUCT- ANCE (US /CM) 399 425 447 450 450 479 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 14 -- -- 13 -- 13 SOLIDS, DIS- SOLVED (TONS PER DAY) 5.97 -- -- 2.38 -- 2.37 PH WATER WHOLE FIELD (STAND- ARD UNITS) 7.6 7.9 7.6 7.5 7.5 7.4 SODIUM, DIS- SOLVED (MG/L AS NA) 26 -- -- 28 -- 33 RESIDUE TOTAL AT 105 DEC. C, SUS- PENDED (MG/L) 13 59 11 7 <1 132 TEMPER- ATURE WATER (DBG C) 27.5 22.8 23.0 25.0 25.0 28.0 SODIUM AD- SORP- TION RATIO 0.9 -- -- 1 -- 1 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.40 0.50 0.50 -- -- 4.4 TUR- BID- ITY (NTU) 1.4 17 0.60 1.3 1.5 60 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 3.0 -- -- 2.8 -- 4.8 PHOS- PHORUS TOTAL (MG/L AS P) 0.160 0.170 0.200 -- -- 0.550 OXYGEN, DIS- SOLVED (MG/L) 4.8 6.4 5.4 3.4 4.6 2.6 ALKA- LINITY WAT WH TOT PET FIELD MG/L AS CAC03 150 160 180 160 170 170 ARSENIC TOTAL (UG/L AS AS) 1 -- -- 3 -- -- OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 60 73 62 40 54 32 SULFIDE TOTAL (MG/L AS S) 1.0 -- -- 1.1 -- - - BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) 200 -- -- 200 -- -- OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 13 20 17 <10 19 50 SULFATE DIS- SOLVED (MG/L AS S04) 16 -- -- 13 -- 24 BORON, TOTAL RECOV- ERABLE (UO/L AS B) 40 -- -- 40 -- -- COLI- FORM, FECAL, 0.45 UM-MP (COLS./ 100 ML) 53000 46000 62000 21000 K78000 470000 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 28 -- -- 33 -- 39 CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- <1 -- -- STREP- TOCOCCI FECAL, (COLS. PER 100 ML) 25000 280000 7600 15000 K150000 600000 FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.20 -- -- 0.20 -- 0.20 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) <1 -- -- <1 -- -- K = non- ideal count 170 RIO PUERTO NDBVO BASIN S0048800 RIO PIBDRAS NEAR RIO PIBDRAS, PR—Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE COPPER, TOTAL RECOV- ERABLE (UG/L IRON, TOTAL RECOV- ERABLE (UG/L LEAD, TOTAL RECOV- ERABLE (UG/L MANGA- NESE, TOTAL RECOV- ERABLE (UG/L MERCURY TOTAL RECOV- ERABLE (UG/L SELE- NIUM, TOTAL (UG/L SILVER, TOTAL RECOV- ERABLE (UG/L ZINC, TOTAL RECOV- ERABLE (UG/L CYANIDE TOTAL (MG/L PHENOLS TOTAL MBTHY- LBNB BLUB ACTIVE SUB- STANCE AS CO) AS FE) AS PB) AS MN) AS HG) AS SB) AS AG) AS ZN) AS CN) (UG/L) (MO/L) OCT 1993 25. .. DEC 06. .. FBB 1994 22. .. MAY 01. .. JUN 13. .. AUG 08. .. 10 300 370 100 280 <0.10 <0.10 <0.010 10 <0.010 0.07 <0.02 PESTICIDE ANALYSES DATE PCB, TIME TOTAL (DG/L) ALDRIN, TOTAL (OG/L) CHLOR- DANE, TOTAL (OG/L) DI- DI- BNDO- DDD, DDE, DOT, AZINON, ELDRIN SOL FAN, TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (OG/L) (OG/L) (OG/L) (OG/L) (OG/L) (OG/L) JUN 13.. . 08SS 1.010 <0.010 <0.010 <0.010 0.02 <0.010 <0.010 DATE ENDRIN WATER UNFLTRD BTHION, RBC TOTAL (UG/L) (UG/L) HBPTA- METH- METHYL HBPTA- CHLOR MALA- OXY- PARA- CHLOR, BPOXIDB LINDANB THION, CHLOR, THION, MIREX, TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN 13. .. <0.010 <0.01 <0.010 <0.010 <0.010 <0.01 <0.01 <0.01 <0.01 DATE PARA- THION, TOTAL (UG/L) NAPH- THA- LENES, POLY- CHLOR. TOTAL (UG/L) PER- THANE TOTAL (UG/L) TOX- APHENE, TOTAL (UG/L) TOTAL TRI- THION (UG/L) 2,4-D, TOTAL (UG/L) 2,4,5-T TOTAL (UG/L) 2, 4-DP TOTAL (UG/L) SILVEX, TOTAL (UG/L) JUN 13.. . <0.01 <0.10 <0.01 <0.01 <0.01 <0.01 <0.01 RIO PUERTO NDBVO BASIN 50049100 RIO PIBDRAS AT HATO RBY, PR LOGATION.--Lat 18°24'34", long 66°04'10", Hydrologic Unit 21010005, at bridge on Avenida Pifteiro near Expreso Las Americas (Luis A. Perre), and 0.8 mi (1.3 km) southwest of Hato Rey. DRAINAGE AREA.--15.4 mi 1 (39.9 km'). 171 WATER-DISCHARGE RECORDS asu nts only), 1972 to December 1982 (maximum PERIOD OF RECORD.—June 1970 to December 1987 (discharge discharge only), January 1988 to current year. GAGE.—Water-stage recorder and crest-stage gage. Elevation of gage is 16 ft (5 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. Mean daily discharge affected by sewage discharges (approximately 2.0 ft'/s (0.06 m'/s)), 20 ft (6 m) upstream from gaging station. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY OCT NOV DEC JAN FBB MAR APR MAY JUN JUL SEP 1 28 25 2 13 30 3 13 14 4 184 15 5 73 56 6 86 15 7 46 14 8 32 87 9 30 46 10 63 33 11 22 12 12 19 29 13 18 101 14 17 136 15 17 244 16 83 316 17 228 187 18 89 101 19 67 54 20 72 27 21 51 18 22 54 14 23 25 14 24 22 16 25 22 15 26 21 35 27 57 13 28 27 16 29 28 25 30 19 17 31 15 TOTAL 1541 1725 MEAN 49.7 57.5 MAX 228 316 MIN 13 12 AC-FT 3060 3420 CFSM 3.27 3.78 IN. 3.77 4.22 STATISTICS OF MONTHLY MEAN MEAN 68.5 78.1 MAX 134 235 (WY) 1991 1993 MIN 16.6 23.9 (WY) 1992 1991 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN-DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE ANNUAL RUNOFF (AC-FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 16 17 12 57 18 12 11 9.6 11 9.1 9.1 32 9.2 11 12 13 16 176 16 58 9.8 13 8.4 8.5 13 12 46 44 11 18 14 722.7 23.3 176 8.4 1430 1.53 1.77 DATA 54.8 168 1993 18.8 1992 FOR 45 53 21 14 16 17 e!4 ell e!4 e!2 e!50 e25 e!5 e!3 e!6 e25 e!5 e!4 e!3 e!7 e20 e35 ellO e25 e!5 e!3 e23 e20 75 14 13 883 28.5 150 11 1750 1.87 2.16 17 15 15 37 14 17 19 12 13 e!3 e!2 e!3 ell e!5 e!2 e!2 ell ell elO elO e9.8 e9.6 e9.0 8.3 13 11 53 12 ___ 414.7 14.8 53 8.3 823 .97 1.01 FOR WATER YEARS 1972 42.7 97.4 1993 12.9 1973 35.6 80.2 1991 10.8 1992 25 20 11 9.5 18 23 13 11 12 12 8.7 13 7.8 12 12 14 9.4 9.9 10 10 10 7.8 7.0 7.9 8.3 7.6 8.1 9.2 9.9 12 8.2 357.3 11.5 25 7.0 709 .76 .87 - 1994 37.8 78.5 1972 11.5 1994 1993 CALENDAR YEAR 21068.7 57.7 862 8.4 11 41790 3.80 51.56 110 29 13 Jul 11 Dec 23 Dec 5 7.3 9.3 8.7 5.6 88 20 6.3 6.1 7.1 296 89 97 25 40 64 25 28 18 22 24 21 16 12 11 11 11 55 11 8.7 8.6 1051.7 35.1 296 5.6 2090 2.31 2.57 8.0 8.6 7.9 8.4 9.6 33 16 26 9.2 158 25 9.9 8.8 8.6 8.6 8.7 8.1 55 9.3 9.0 12 8.8 10 11 9.3 9.1 8.8 37 11 9.7 10 572.4 18.5 158 7.9 1140 1.21 1.40 7.4 6.6 25 7.5 8.3 14 8.0 7.3 7.3 7.8 8.0 7.3 7.7 9.4 184 15 66 9.1 7.7 6.6 6.7 6.4 6.2 6.3 43 27 6.1 6.3 49 23—— 600.0 20.0 184 6.1 1190 1.32 1.47 5.8 105 13 9.7 47 26 12 7.6 5.8 5.0 4.6 10 13 9.2 6.1 e!8 e5.6 e8.8 e5.6 e8.8 e5.6 e7.0 e7.2 e7.6 e7.0 e5.2 e5.4 e5.2 e7.0 e5.0 e9.0 397.8 12.8 105 4.6 789 .84 .97 e8.8 e7.0 e6.0 7.3 12 6.4 19 100 15 24 8.2 6.1 6.1 23 6.1 6.4 7.3 94 44 30 7.6 33 100 127 57 22 33 241 63 16 21 1157.3 37.3 241 6.0 2300 2.46 2.83 46 64 17 9.4 12 66 49 19 13 39 13 6.7 12 20 106 29 10 5.4 19 207 22 32 16 72 100 11 6.7 6.5 5.2 5.1 1039.0 34.6 207 5.1 2060 2.28 2.54 , BY WATER YEAR (WY) 66.1 150 1972 31.6 1991 FOR 1994 10461 28 316 4 6 2730 13 20750 1 25 66 13 7 45.9 97.5 1992 4.12 1972 WATER YEAR .9 .7 Nov 16 .6 Jul 11 .1 Jul 24 Apr 10 .55 Apr 10 .89 .60 .0 38.3 78.1 1989 20.0 1994 45.1 97.4 1993 12.8 1994 WATER 50 84 28 3210 1 1 8640 20 36190 3 44 117 21 9 52.2 84.2 1988 20.2 1993 YEARS 1972 .0 .0 .7 Aug .2 Jun .2 Jul Jun .77 Jun .29 .65 .5 59.2 150 1989 26.3 1972 - 1994 1993 1994 20 1972 28 1972 5 1972 17 1970 17 1970 e Estimated 172 RIO PUERTO NUEVO BASIN 50049100 RIO PIBDRAS AT HATO RBY, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°24'34", long 66°04'10", at bridge on Avenida Pinero at Bxpreso Las Americas, and 0. (1.3 km) southwest of Hato Rey. DRAINAGE AREA.--15.4 mi 1 (39.9 km'). PERIOD OF RECORD.--Water years 1971 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 8 mi DATE OCT 1993 25... DEC 06... FEB 1994 22... MAY 01. .. JUN 13. .. AUG 10. .. DATE OCT 1993 25. . . DEC 06. . . FEB 1994 22. .. MAY 01. .. JDN 13. .. AOG 10. .. DATE OCT 1993 25. . . DEC 06. . . FEB 1994 22... MAY 01. .. JDN 13. .. AOG 10. . . TIME 1450 1255 1220 1035 1050 1020 HARD- NESS TOTAL (M6/L AS CACO3 ) 160 -- -- 170 -- 160 SILICA, DIS- SOLVED (M6/L AS SI02) 30 -- -- 31 -- 27 DIS- CHARGE, INST. CUBIC FEET PER SECOND 8.7 12 9.6 7.6 7.3 5.1 CALCIUM DIS- SOLVED (MG/L AS CA) 45 -- -- 47 -- 44 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 249 -- -- 276 -- 247 SPE- CIFIC CON- DUCT- ANCE (US/CM) 432 495 517 282 540 460 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 12 -- -- 12 -- 11 SOLIDS, DIS- SOLVED (TONS PER DAY) 5.84 -- -- 5.71 -- 3.43 PH HATER WHOLE FIELD (STAND- ARD UNITS) 7.3 7.8 7.6 7.5 7.6 7.4 SODIUM, DIS- SOLVED (MG/L AS NA) 28 -- -- 32 -- 29 RESIDUE TOTAL AT 105 DBG. C, SUS- PENDED (MG/L) 8 12 11 10 2 36 TEMPER- ATURE WATER (DBG C) 30.5 27.5 28.0 28.0 30.0 29.0 SODIUM AD- SORP- TION RATIO 1 -- — 1 -- 1 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 1.7 2.3 2.5 -- 2.6 1.7 TUR- BID- ITY (NTU) 0.80 0.70 0.60 1.0 1.3 5.8 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 3.6 -- -- 3.1 -- 4.4 PHOS- PHORUS TOTAL (MG/L AS P) 0.420 0.450 1.10 -- 0.510 0.290 OXYGEN, DIS- SOLVED (MG/L) 4.3 6.0 3.8 4.0 3.6 3.8 ALKA- LINITY WAT WH TOT FBT FIELD MG/L AS CAC03 140 150 170 170 180 120 ARSENIC TOTAL (UG/L AS AS) 2 -- -- 3 -- -- OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 56 75 48 50 47 52 SULFIDE TOTAL (MG/L AS S) 0.6 -- -- <0.5 -- "" BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) 100 -- -- 200 -- -- OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 21 28 56 13 17 26 SULFATB DIS- SOLVED (MG/L AS S04) 16 -- -- 13 -- 23 BORON, TOTAL RECOV- ERABLE (DG/L AS B) 60 -- -- 60 -- -- COLI- FORM, FECAL, 0.45 UM-MF (COLS./ 100 ML) K600000 86000 91000 300000 K78000 37000 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 30 -- -- 36 -- 36 CADMIUM TOTAL RECOV- ERABLE (DG/L AS CD) <1 -- -- <1 -- -- STREP- TOCOCCI FECAL, (COLS. PER 100 ML) 730000 24000 34000 62000 K9700 7200 FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.20 -- -- 0.20 -- 0.20 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) <1 -- -- <1 -- -- K = non-ideal count RIO PUERTO NDBVO BASIN 50049100 RIO PIBDRAS AT HATO RBY, PR—Continued WATER-QUALITY DATA, HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 173 DATE OCT 1993 25. .. DEC 06. . . PBB 1994 22. . . MAY 01. .. JUN 13. .. AUG 10. .. COPPER, TOTAL RECOV- ERABLE (DG/L IRON, TOTAL RECOV- ERABLE (DG/L LEAD, TOTAL RECOV- ERABLE (DG/L MANGA- NESE, TOTAL RECOV- ERABLE (DG/L MERCURY TOTAL RECOV- ERABLE (DG/L SELE- NIUM, TOTAL (DG/L SILVER, TOTAL RECOV- ERABLE (DG/L ZINC, TOTAL RECOV- ERABLE (DG/L CYANIDE TOTAL (MG/L PHENOLS TOTAL MBTHY- LENB BLUE ACTIVE SUB- STANCE AS CD) AS PB) AS PB) AS MN) AS HG) AS SB) AS AG) AS ZN) AS CN) (DG/L) 10 280 340 100 220 <0.10 <0.10 10 <0.010 <0.010 (MG/L) 0.10 0.14 174 RIO PUERTO NOBVO 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 Cafio de Martin Pefia, and 650 ft (200 m) south of Isla Guachinango. DRAINAGE AREA.--Indeterminate. PERIOD OF RECORD.--Water years 1974 to current year. HATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE NOV 1993 01. .. DEC 21. . . MAR 09. . . MAY 09. . . JUL 05. .. SEP 02. . . DATE NOV 1993 01... DEC 21... MAR 09. .. MAY 09. . . JUL 05. .. SEP 02. .. PH OXYGEN, COLI- SPB- WATER TRANS- DIS- FORM, CIPIC WHOLE PAR- SOLVED FECAL, CON- FIELD TEMPER- BNCY OXYGEN, (PER- 0.45 D0CT- (STAND- ATURB (SBCCHI DIS- CENT DM-MF TIME ANCE ARD WATER DISK) SOLVED SATUR- (COLS./ (OS/CM) UNITS) (DBG C) (IN) (MG/L) ATION) 100 ML) 1100 10100 0955 14600 1010 26800 0945 34600 1020 24400 0930 35400 ALKA- STREP- LINITY TOCOCCI WAT WH FECAL, TOT PET (COLS. FIELD PER MG/L AS 100 ML) CACO3 110 114 2400 136 14000 140 7100 110 7500 147 260 128 7.8 8.0 6.7 6.6 8.4 7.6 RESIDUE TOTAL AT 105 DBG. C, SUS- PENDED (MG/L) 7 2 16 27 22 33 31.0 12.5 27.5 10.5 28.0 16.9 28.0 22.8 30.0 14.8 29.0 11.0 NITRO- GEN, AM- MONIA + NITRO- ORGANIC GEN, TOTAL TOTAL (MG/L (MG/L AS N) AS N) 3.7 3.7 1.8 1.8 3.7 3.7 3.7 3.7 3.4 3.4 3.0 3.0 4.4 8.2 0.9 3.0 0.7 7.5 PHOS- PHORUS TOTAL (MG/L AS P) 0.410 0.210 0.410 0.560 0.490 0.590 57 108 1 38 10 96 CARBON, ORGANIC TOTAL (MG/L AS C) 8.9 7.0 36 16 10 22- 5200 45000 44000 5900 20000 K6200 K = non-ideal count RIO PUERTO NDBVO BASIN 50049920 BAHIA DB SAN JUAN NO. 5 AT SAN JUAN, PR HATER-QUALITY RECORDS LOCATION—Lat 18°26'37", long 66005'11", 0.4 ml (0.6 km) west of Puente de la Constituci6n, and 0.5 ml (0.8 km) south from U.S. Naval Reservation. DRAINAGE—Indeterminate. PERIOD OF RBCORD--Water years 1974 to present. WATER-QUALITY DATA, HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 775 DATE NOV 1993 01. .. DEC 20. . . MAR 1994 08. . . MAY 06. .. JUN 30. . . AUG 31. . . NOV 01 DEC 20 MAR 08 MAY 06 JUN 30 AUG 31 K = PH OXYGEN, COLI- SPB- HATER TRANS- DIS- FORM, CIFIC WHOLE PAR- SOLVED FECAL, CON- FIELD TEMPER- BNCY OXYGEN, (PER- 0.45 DUCT- (STAND- ATURB (SBCCHI DIS- CENT UM-MF TIME ANCB ARD HATER DISK) SOLVED SATUR- (COLS./ (US/CM) UNITS) (DBG C) (IN) (MG/L) ATION) 100 ML) 1150 38200 1145 41800 0935 27900 1000 50000 0915 50000 1000 42800 ALRA- STREP- LINITY TOCOCCI WAT WH FECAL, TOT FET (COLS. FIELD DATE PER MG/L AS 100 ML) CACO3 1993 K500 126 K400 107 1994 39000 150 K1400 140 88000 110 250 140 non-ideal count 8.0 8.1 7.5 7.8 7.0 7.6 RESIDUE TOTAL AT 105 DBG. C, SUS- PENDED (MG/L) 820 26 28 30 18 35 31.0 26.3 25.5 36.0 26.0 26.0 285.0 17.2 30.0 23.7 30.0 36.0 NITRO- GEN, AM- MONIA + NITRO- ORGANIC GEN, TOTAL TOTAL (MG/L (MG/L AS N) AS N) 1.9 1.9 2.3 2.3 1.3 1.3 2.1 2.1 2.4 2.4 1.6 1.6 3.8 5.2 1.0 2.4 0.3 4.1 PHOS- PHORUS TOTAL (MG/L AS P) 0.160 0.290 0.180 0.280 0.380 0.230 51 K15000 63 K28000 12 430000 30 K180000 4 360000 53 4600 CARBON, ORGANIC TOTAL (MG/L AS C) 7.4 7.3 9.4 11 10 5.1 776 THIS PAGE WAS LEFT BLANK INTENTIONALLY 777 v -U/ A SURFACE-WATER STATION ""' A 0509 AND NUMBER QUALITY-OF-WATER STATION NUMBER 0575 PARTIAL RECORD STATION AND NUMBER 01 23456 KILOMETERS 222 WELL AND WELL NUMBER LAKE-ELEVATION STATION 234 MILES Figure 20.--Rio Grande de Lofza basin. 178 RIO GRANDB DE LOIZA BASIN 50050300 QOEBRADA BLASINA NEAR CAROLINA, PR WATER-QUALITY RECORDS LOCATION.—Lat 18°23'27", long 65°58'28", at bridge on Highway 3, 1.4 mi (2.3 km) south of Valle Arriba Heights housing area, and 1.2 mi (1.9 km) west-southwest of Carolina plaza. DRAINAGE AREA.--2.96 mi» (7.67 km9 ). PERIOD OP RECORD.—Water years 1973 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE OCT 1993 22... DEC 08... PEB 1994 18... APR 08... JUN 14. . . AUG 11. .. DATE OCT 1993 22... DEC 08... FBB 1994 18... APR 08... JUN 14... AUG 11. .. DATE OCT 1993 22. .. DEC 08. . . FBB 1994 18. .. APR 08. . . JUN 14. .. ADG 11... TIME 1335 1030 1000 1045 0940 1035 HARD- NESS TOTAL (MG/L AS CAC03) 140 — — -- -- 180 SILICA, DIS- SOLVED (MG/L AS SI02) 21 — — -- -- 18 DIS- CHARGE, INST. CUBIC FEET PER SECOND 12 11 13 4.2 6.1 5.3 CALCIUM DIS- SOLVED (MG/L AS CA) 42 -- -- -- -- 53 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 219 -- -- -- -- 320 SPE- CIFIC CON- DUCT- ANCE (US /CM) 394 210 367 455 610 517 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 7.8 -- -- — — 11 SOLIDS, DIS- SOLVED (TONS PER DAY) 7.15 — — — -- 4.58 PH WATER WHOLE FIELD (STAND- ARD UNITS) 7.6 7.6 7.3 7.4 7.5 7.4 SODIUM, DIS- SOLVED (MG/L AS NA) 23 -- -- -- -- 32 RESIDUE TOTAL AT 105 DBG. C, SUS- PENDED (MG/L) 28 90 24 -- <1 376 TEMPER- ATURE WATER (DBG C) 27.5 24.5 24.0 25.5 25.0 28.0 SODIUM AD- SORP- TION RATIO 0.9 — — — — 1 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.90 1.6 1.1 1.3 1.3 4.0 TUR- BID- ITY (NTU) 17 2.0 1.0 -- 0.90 400 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 3.0 -- -- -- -- 4.8 PHOS- PHORUS TOTAL (MG/L AS P) 0.150 0.430 0.320 0.280 0.240 0.700 OXYGEN, DIS- SOLVED (MG/L) 4.3 5.8 5.4 3.4 3.2 1.4 ALKA- LINITY WAT WH TOT FET FIELD MG/L AS CACO3 130 110 140 160 190 170 ARSENIC TOTAL (UG/L AS AS) 1 — — 1 — — OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 54 69 63 41 38 16 SULFIDB TOTAL (MG/L AS S) <0.5 -- -- <0.5 -- "" BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 -- -- <100 -- -- OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 24 28 33 24 20 95 SULFATB DIS- SOLVED (MG/L AS S04) 14 -- -- -- -- 30 BORON, TOTAL RECOV- ERABLE (UG/L AS B) 40 — — 60 — — COLI- FORM, FECAL, 0.45 UM-MF (COLS./ 100 ML) 530000 480000 3000 1700 21000 110000 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 30 -- -- -- -- 69 CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- <1 -- -- STREP- TOCOCCI FECAL, (COLS. PER 100 ML) K120000 16000 1200 1500 21000 23000 FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.20 -- -- -- — <0.10 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) <1 -- -- <1 — -- K = non-ideal count RIO GRANDE DE LOIZA BASIN 50050300 QDEBRADA BLASINA NEAR CAROLINA, PR—Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 779 COPPER, TOTAL RECOV- ERABLE DATE (UG/L IRON, TOTAL RECOV- ERABLE (UG/L LEAD, TOTAL RECOV- ERABLE (UG/L MANGA- NESE, MERCURY TOTAL TOTAL RECOV- ERABLE (UG/L RECOV- ERABLE (UG/L SELE- NIUM, TOTAL (UG/L SILVER, TOTAL RECOV- ERABLE (UG/L ZINC, TOTAL RBCOV- CYANIDE ERABLE TOTAL (UG/L (MG/L METHY- LBNE BLUE ACTIVE PHENOLS SUB- TOTAL STANCE AS CD) AS PB) AS PB) AS MN) AS HG) AS SB) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1993 22. .. DEC 08. .. FEB 1994 18. .. APR 08... JUN 14. .. AUG 11... 700 140 <1 230 440 <0.10 <0.10 10 <0.010 2 0.09 <0.010 0.07 780 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 mi (0.3 km) upstream from confluence with Rio Bmajagua and about 7.1 mi (11.4 km) southwest of San Lorenzo. DRAINAGE AREA.--6.00 mi 9 (15.54 km 9 ). 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. Gage-height and precipitation satellite telemetry at station. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG 1 32 12 2 22 12 3 18 12 4 22 11 5 22 9.9 6 12 8 9.9 7 44 11 8 29 11 9 25 12 10 22 17 11 22 12 12 22 11 13 19 12 14 18 25 15 17 15 16 19 43 17 18 91 18 16 132 19 15 72 20 15 125 21 15 91 22 19 71 23 25 34 24 16 28 25 18 29 26 20 55 27 14 27 28 50 20 29 17 17 30 14 40 31 13 --- TOTAL 766 1067.8 MEAN 24.7 35.6 MAX 128 132 MIN 13 9.9 AC-FT 1520 2120 CFSM 4.12 5.93 IN. 4.75 6.62 STATISTICS OP MONTHLY MEAN MEAN 40.8 46.6 MAX 123 122 (WY) 1986 1988 MIN 13.1 8.34 (WY) 1990 1990 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN-DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE INSTANTANEOUS LOW FLOW ANNUAL RUNOFF (AC-FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 20 15 14 16 16 14 13 12 12 12 11 11 11 11 10 10 9.8 11 10 10 11 10 10 10 11 10 12 18 12 13 11 376.8 12.2 20 9.8 747 2.03 2.34 DATA 23.8 55.2 1988 6.65 1990 FOR 18 15 13 20 29 15 13 12 33 21 17 20 24 41 22 18 16 16 14 13 12 12 11 11 11 11 10 10 10 12 10 510 16.5 41 10 1010 2.74 3.16 10 11 11 13 11 10 9.9 9.9 9.1 9.0 11 8.7 8.5 20 12 10 10 11 55 455 31 26 25 20 13 12 11 37___ ___ --- 880.1 31.4 455 8.5 1750 5.24 5.46 FOR WATER YEARS 1978 18.4 56.1 1992 8.16 1990 17.4 38.0 1982 6.36 1979 27 15 16 13 11 11 11 11 11 14 12 15 12 11 10 10 10 10 9.9 9.9 9.5 8.9 8.8 8.7 8.5 9.1 8.3 8.3 12 10 8.7 350.6 11.3 27 8.3 695 1.88 2.17 - 1994 12.3 33.1 1989 5.07 1979 1993 CALENDAR YEAR 12396.6 34.0 946 5.1 5.9 24590 5.66 76.86 59 17 7.6 Jul 11 Apr 12 Apr 1 8.4 8.1 8.0 7.7 7.4 7.2 7.2 7.1 6.6 6.6 8.1 7.6 6.5 6.6 7.5 8.0 7.6 9.4 7.0 6.3 6.3 8.4 7.4 6.5 6.3 5.6 5.6 6.4 5.7 5.3 --- 212.4 7.08 9.4 5.3 421 1.18 1.32 5.1 5.1 4.9 5.8 9.0 7.7 5.9 6.2 29 49 15 10 19 16 18 13 11 9.4 8.8 7.8 7.6 7.2 7.1 6.6 6.3 6.3 6.3 6.0 5.8 5.5 5.4 325.8 10.5 49 4.9 646 1.75 2.02 5.5 5.3 5.1 6.8 5.7 41 9.2 7.0 6.6 6.3 6.7 6.6 6.2 5.8 24 12 40 21 12 9.0 7.6 6.8 6.6 6.2 6.4 169 17 12 9.8 8.3 491.5 16.4 169 5.1 975 2.73 3.05 7.8 7.5 16 9.6 7.4 6.9 8.4 7.7 6.7 6.4 6.3 6.1 6.1 5.8 5.3 5.6 5.6 254 22 13 11 9.6 8.7 8.2 7.9 7.5 7.2 7.1 7.1 6.9 16 511.4 16.5 254 5.3 1010 2.75 3.17 11 8.1 7.3 7.5 7.7 6.7 9.8 6.9 7.0 22 17 8.4 7.3 6.6 6.3 5.8 5.6 32 15 8.3 7.1 7.8 6.8 201 75 17 13 11 10 9.4 8.7 573.1 18.5 201 5.6 1140 3.08 3.55 9.0 11 8.9 7.8 7.8 25 15 11 22 14 61 21 14 12 71 103 35 20 174 593 69 33 24 25 16 17 12 11 9.7 8.9 --- 1461.1 48.7 593 7.8 2900 8.12 9.06 , BY WATER YEAR (WY) 12.9 27.1 1985 4.64 1979 FOR 1994 7526. 20. 593 4. 5. 3540 9. 4. 14930 3. 46. 30 11 6. 33.3 77.5 1985 9.56 1988 WATER YEAR 6 6 Sep 20 9 May 3 4 Apr 27 Sep 20 77 Sep 20 9 May 2 44 66 3 37.9 122 1979 11.3 1985 36.9 92.3 1993 12.5 1986 WATER 28. 49. 14. 1250 3. 3. 11700 14. 2. 20970 4. 65. 49 14 6. 29.7 90.0 1979 9.30 1991 YEARS 1978 9 6 5 Oct 1 May 6 May Nov 78 Nov 8 May 82 54 8 36.8 94.3 1979 11.8 1981 - 1994 1979 1990 6 1985 7 1979 1 1979 5 1983 5 1983 5 1979 RIO GRANDE DE LOIZA BASIN 50051150 QUEBRADA BLANCA AT EL JAGUAL, PR LOGATION.--Lat 180 09'40", long 65°58'58", Hydrologic Unit 21010005, 0.1 mi (0.2 km) upstream from bridge on Highway 181, and 2.8 mi (4.5 km) southwest of San Lorenzo. 181 DRAINAGE AREA.--3.25 mi' (8.42 km'). HATER-DISCHARGE RECORDS PERIOD OF RECORD.--October 1984 to current year. GAGE.--Hater-stage recorder and crest-stage gage. 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. DISCHARGE, CUBIC FEET PER SECOND, HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES NOV DEC JAN FEB MAY JUN JUL AUG 1 3.7 1.2 2 2.7 1.3 3 2.2 1.5 4 2.0 1.3 5 2.2 1.3 6 3.7 1.4 7 2.7 1.4 8 1.9 1.7 9 1.5 1.8 10 1.4 1.5 11 1.3 1.1 12 1.7 .88 13 1.2 .82 14 1.0 1.1 15 1.0 1.5 16 10 18 17 6.0 5.4 18 2.7 34 19 2.0 14 20 1.5 41 21 1.3 e32 22 1.4 e!9 23 2.2 e!4 24 1.5 e9.2 25 9.8 e!5 26 15 e!3 27 3.5 e7.5 28 2.5 e4.3 29 1.8 e3.6 30 1.6 e4.0 31 1.3 TOTAL 94.3 253.80 MEAN 3.04 8.46 MAX 15 41 MIN 1.0 .82 AC-FT 187 503 CFSM .94 2.60 IN. 1.08 2.91 STATISTICS OF MONTHLY MEAN MEAN 11.0 17.3 MAX 47.8 36.9 (WY) 1986 1985 MIN 2.75 2.49 (WY) 1993 1990 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN-DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE INSTANTANEOUS LOW PLOW ANNUAL RUNOFF (AC-FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS e4.5 e3.9 3.2 9.2 e4.6 3.1 2.7 2.6 2.5 2.2 1.9 1.9 2.0 1.9 1.9 1.8 1.8 2.3 2.1 1.9 2.0 1.9 1.9 2.0 1.8 1.7 1.9 2.9 2.1 1.8 1.6 79.6 2.57 9.2 1.6 158 .79 .91 DATA 7.24 30.1 1988 1.49 1990 FOR 1.9 1.9 1.8 1.7 2.5 1.8 1.4 1.3 1.6 2.9 1.9 1.7 3.8 5.2 2.7 2.2 2.1 2.1 2.0 2.0 2.2 2.0 1.8 1.9 1.8 2.4 1.6 1.5 1.7 2.2 2.8 66.4 2.14 5.2 1.3 132 .66 .76 2.1 2.0 2.3 2.5 2.8 2.6 1.8 1.7 1.4 1.5 1.6 1.6 1.5 2.7 2.6 1.8 1.5 1.5 3.2 e60 4.5 2.7 11 7.8 5.3 2.9 2.2 2.1 ___ ___ --- 137.2 4.90 60 1.4 272 1.51 1.57 FOR HATER YEARS 1984 4.66 9.94 1992 1.79 1990 4.09 8.21 1989 1.32 1985 20 8.0 4.1 3.1 2.4 1.9 1.4 1.3 2.3 2.0 1.3 17 4.5 2.8 2.3 2.0 1.7 1.5 1.5 1.4 1.3 1.2 1.2 1.1 1.0 .99 .90 .81 1.2 1.4 1.1 94.70 3.05 20 .81 188 .94 1.08 - 1994 4.19 20.7 1989 1.64 1993 1993 CALENDAR YEAR 1954. 5. 213 1. 3880 1. 22. 10 2. 1. 49 35 Jul 11 82 Nov 13 1 Mar 28 65 37 8 3 .87 .82 .85 .82 .90 1.0 1.2 .98 .58 .75 2.8 1.5 .79 .70 .72 .80 .71 .63 .49 .43 .42 .43 .39 .50 .44 .39 .40 .40 .38 .36 --- 22.45 .75 2.8 .36 45 .23 .26 .35 .34 .55 .68 1.0 .72 .44 .42 1.5 1.8 .78 .43 .56 1.8 .62 .44 .52 .43 .37 .33 .33 .38 .39 .39 .43 .44 .43 .47 .47 .50 .88 19.19 .62 1.8 .33 38 .19 .22 .74 .71 .66 .76 .77 3.7 1.7 1.1 1.3 .99 1.1 1.1 .65 .58 1.1 1.2 4.7 4.6 2.8 1.4 .90 .64 .50 .43 .53 18 3.2 2.8 2.1 2.8 --- 63.56 2.12 18 .43 126 .65 .73 2.3 1.2 1.8 2.5 1.4 .98 1.2 1.1 1.1 .99 .99 .89 .88 .78 .68 .66 .79 22 6.6 3.0 1.8 1.4 1.1 .92 .84 .88 .99 .90 1.2 .94 2.1 64.91 2.09 22 .66 129 .64 .74 1.6 1.1 .82 1.0 1.1 1.0 1.1 .78 .88 2.2 1.6 1.2 .95 .84 .77 .73 .69 3.7 2.9 1.5 1.1 1.2 .92 5.4 12 4.2 3.1 2.3 1.6 1.2 1.1 60.58 1.95 12 .69 120 .60 .69 1.3 2.7 1.5 .96 .89 6.7 3.6 2.1 2.5 1.9 4.0 2.4 1.5 .98 15 5.8 3.2 1.6 9.0 e201 8.8 3.9 2.8 2.0 1.3 .96 .87 .87 .90 .96 --- 291.99 9.73 201 .87 579 2.99 3.34 , BY HATER YEAR (WY) 2.28 4.88 1989 .75 1994 FOR 1994 1248. 3. 201 . 3420 10. . 2480 1. 14. 4. 1. . 8.07 31.5 1985 .62 1994 WATER YEAR 68 42 Sep 20 33 May 20 37 Apr 26 Sep 20 88 Sep 20 30 May 21 05 29 9 6 56 5.85 21.3 1987 2.12 1994 5.74 15.0 1993 2.02 1986 WATER 7 12 2 457 7400 14 5070 2 29 12 2 1 6.03 20.2 1988 1.95 1994 YEARS 1984 .00 .3 .50 .33 .37 .58 .30 .15 .25 .5 .0 Dec May Apr May May May 7.48 14.3 1985 1.36 1990 - 1994 1988 1990 7 1987 20 1994 26 1994 17 1985 17 1985 21 1994 e Estimated 182 RIO ORANDE DE LOIZA BASIN 50051150 QUEBRADA BLANCA AT EL JAGUAL, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORD.-- Water years 1985 to 1986 and water year 1989 to current year. PERIOD OF DAILY RECORD.-- SUSPENDED-SEDIMENT DISCHARGE: October 1984 to September 1986 and from October 1989 to September 1994. INSTRUMENTATION.-- USD-77 and automatic sediment sampler. REMARKS.-- Sediment samples were collected by a local observer on a weekly basis and during high flow events. EXTREMES FOR PERIOD OF DAILY RECORD.-- SEDIMENT CONCENTRATIONt Maximum daily mean, 7,300 mg/L Oct. 06, 1985; Minimum daily mean, 1 mg/L several days. SEDIMENT LOADS: Maximum daily mean, 4,940 tone (23,400 tonnes) May 17, 1985; Minimum daily mean, 0.0 ton (0.0 tonne) several days. EXTREMES FOR WATER YEARS 1994.-- SEDIMBNT CONCENTRATION: Maximum daily mean, 713 mg/L Sep. 20, 1994; Minimum daily mean, 1 mg/L several days. SEDIMENT LOADS: Maximum daily mean, 2,260 tons (2,050 tonnes) Sep. 20, 1994; Minimum daily mean, <0.01 ton (<0.1 tonne) Several days. SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN CONCBN- SEDIMENT TRATION DISCHARGE (MO/L) (TONS/DAY) NOVEMBER MEAN MEAN CONCBN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) MEAN DISCHARGE (CFS) OCTOBER 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 3.7 2.7 2.2 2.0 2.2 3.7 2.7 1.9 1.5 1.4 1.3 1.7 1.2 1.0 1.0 10 6.0 2.7 2.0 1.5 1.3 1.4 2.2 1.5 9.8 15 3.5 2.5 1.8 1.6 1.3 6 6 4 4 5 6 6 5 7 7 8 6 4 5 6 75 44 6 7 7 12 18 16 12 63 102 10 4 5 6 8 .06 .04 .03 .03 .04 .06 .04 .03 .04 .02 .02 .02 .02 .02 .01 6.6 .86 .05 .04 .02 .04 .07 .10 .05 13 12 .10 .03 .02 .02 .03 1.2 1.3 1.5 1.3 1.3 1.4 1.4 1.7 1.8 1.5 1.1 .88 .82 1.1 1.5 18 5.4 34 14 41 e32 e!9 e!4 e9.2 e!5 e!3 e7.5 e4.3 e3.6 e4.0 9 7 4 3 4 4 4 5 6 9 14 18 18 17 15 131 21 232 87 292 197 53 99 28 110 32 30 28 26 141 .02 .03 <.01 .01 .01 .02 .01 .02 .02 .04 .04 .04 .04 .05 .06 16 .41 47 4.5 72 e!4 e2.7 e3.7 e.70 e4.5 el.O e.60 e.36 e.27 e!9 MEAN MEAN CONCBN- DISCHARGB TRATIOt (CFS) (MG/L) DECEMBER e4.5 ( e3.9 ( 3.2 ! 9.2 5( e4.6 < 3.1 ! 2.7 ! 2.6 2.5 2.2 1.9 1.9 2.0 1.9 1.9 1.8 1.8 2.3 2.1 1.9 2.0 1.9 1.9 2.0 1.8 1.7 1.9 2.9 2.1 1.8 1.6 SEDIMENT 1 DISCHARGE (TONS /DAY) 1 e.09 > e.07 > .04 > 4.4 > e.08 > .04 5 .04 .03 .02 .02 .02 .02 .02 .02 .02 .02 .02 .02 .02 .02 » .02 » .02 » .02 J .02 } .01 5 .01 } .02 5 .04 1 .02 1 .02 3 .02 TOTAL 94.3 33.51 253.80 187.15 79.6 5.25 e Estimated 183 RIO GRANDS DB LOIZA BASIN 50051150 QUEBRADA BLANCA AT EL JAGOAL, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) FEBRUARY MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/ DAY) JANUARY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 1.9 1.9 1.8 1.7 2.5 1.8 1.4 1.3 1.6 2.9 1.9 1.7 3.8 5.2 2.7 2.2 2.1 2.1 2.0 2.0 2.2 2.0 1.8 1.9 1.8 2.4 1.6 1.5 1.7 2.2 2.8 3 2 1 1 1 2 3 5 6 6 4 2 5 5 4 3 2 3 6 10 14 10 6 3 4 7 6 5 5 4 3 .02 .01 <.01 <. 01 <.01 .01 .02 .02 .02 .05 .03 <.01 .07 .07 .03 .02 .02 .02 .03 .05 .08 .05 .03 .01 .02 .04 .03 .02 .03 .02 .02 2.1 2.0 2.3 2.5 2.8 2.6 1.8 1.7 1.4 1.5 1.6 1.6 1.5 2.7 2.6 1.8 1.5 1.5 3.2 e60 4.5 2.7 11 7.8 5.3 2.9 2.2 2.1 39 7 5 2 2 1 1 1 2 1 1 4 5 6 4 3 3 3 4 432 3 3 75 45 3 2 2 2 .21 .04 .04 .01 .01 .01 .01 .01 .01 .01 <.01 .02 .03 .04 .02 .02 .02 .02 .03 e70 .04 .01 5.8 1.2 .04 .01 .02 <.01 MEAN DISCHARGE (CFS) 20 8.0 4.1 3.1 2.4 1.9 1.4 1.3 2.3 2.0 1.3 17 4.5 2.8 2.3 2.0 1.7 1.5 1.5 1.4 1.3 1.2 1.2 1.1 1.0 .99 .90 .81 1.2 1.4 1.1 MEAN CONCEN- TRATION (MG/L) MARCH 140 18 6 4 2 1 1 1 1 2 2 100 6 3 3 2 1 1 2 2 3 2 1 1 1 1 1 1 1 1 1 SEDIMENT DISCHARGE (TONS/DAY) 32 .61 .07 .03 .02 .01 <.01 <.01 <.01 <.01 <.01 17 .08 .02 .02 .01 <.01 <.01 <.01 .01 .02 .01 .01 .01 .01 .01 .01 .01 .01 .01 .01 TOTAL 66.4 0.84 137.2 77.63 94.70 49.90 e Estimated 184 DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 RIO QRANDB DE LOIZA BASIN 50051150 QUEBRADA BLANCA AT EL JAGOAL, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MO/L) (TONS/DAY) .87 .82 .85 .82 .90 1.0 1.2 .98 .58 .75 2.8 1.5 .79 .70 .72 .80 .71 .63 .49 .43 .42 .43 .39 .50 .44 .39 .40 .40 .38 .36 APRIL 1 .01 2 .01 2 .01 2 .01 2 .01 6 .02 4 .01 2 <.01 2 <.01 1 <.01 3 .03 4 .02 2 <.01 3 «.01 5 .01 4 <.01 2 «.01 1 <. 01 2 <. 01 4 <.01 3 <.01 2 <.01 2 <.01 2 <.01 1 <.01 1 <.01 1 <.01 2 <.01 2 <. 01 2 <.01 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) MAY .35 .34 .55 .68 1.0 .72 .44 .42 1.5 1.8 .78 .43 .56 1.8 .62 .44 .52 .43 .37 .33 .33 .38 .39 .39 .43 .44 .43 .47 .47 .50 .88 1 1 2 2 3 3 3 3 4 5 6 6 5 6 7 7 7 7 6 6 6 6 6 7 8 8 9 9 10 10 7 <.01 <.01 <.01 <.01 .01 <.01 <.01 <.01 .01 .02 .01 <.01 <.01 .03 .02 <.01 .01 .01 .01 .01 .01 .01 .01 .01 .01 .01 .02 .01 .02 .01 .01 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MO/L) (TONS/DAY) JUNE .74 .71 .66 .76 .77 3.7 1.7 1.1 1.3 .99 1.1 1.1 .65 .58 1.1 1.2 4.7 4.6 2.8 1.4 .90 .64 .50 .43 .53 18 3.2 2.8 2.1 2.8 5 5 5 5 5 6 11 15 11 6 7 9 9 6 4 3 3 3 3 2 4 6 6 5 5 132 14 7 5 5 ___ .01 .01 <.01 .01 .01 .06 .06 .04 .05 .02 .01 .03 .02 .01 .01 .01 .03 .04 .02 <.01 .01 .01 <.01 <.01 <.01 13 .15 .05 .02 .04 ___ TOTAL 22.45 0.09 19.19 0.19 63.56 13.73 RIO GRANDE DE LOIZA BASIN 50051150 QUBBRADA BLANCA AT EL JAGUAL, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 185 DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) 2.3 1.2 1.8 2.5 1.4 .98 1.2 1.1 1.1 .99 .99 .89 .88 .78 .68 .66 .79 22 6.6 3.0 1.8 1.4 1.1 .92 .84 .88 .99 .90 1.2 .94 2.1 JULY 3 2 2 1 1 2 2 1 1 3 4 6 7 5 4 4 4 75 5 4 3 2 2 4 4 4 4 5 14 7 5 TOTAL 64.91 —— YEAR e 1248.68 Estimated MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) MEAN DISCHARGE (CFS) AUGUST t .02 <.01 .01 .01 .01 .01 .01 .01 .01 .01 .01 .02 .01 .01 <.01 <.01 .01 10 .12 .04 .02 .01 <.01 .01 .01 .01 .01 .01 .05 .02 .03 10.44 2676.15 1.6 1.1 .82 1.0 1.1 1.0 1.1 .78 .88 2.2 1.6 1.2 .95 .84 .77 .73 .69 3.7 2.9 1.5 1.1 1.2 .92 5.4 12 4.2 3.1 2.3 1.6 1.2 1.1 60.58 6 6 6 5 4 4 4 3 3 3 3 1 3 5 6 6 8 14 4 3 4 6 6 38 35 10 9 5 4 4 4 —— .02 .02 .02 .01 .01 .01 .01 <.01 <.01 .02 .01 <.01 <.01 .01 .01 .02 .02 .19 .02 .02 .02 .02 .02 2.2 2.1 .12 .07 .03 .02 .02 .02 5.06 1.3 2.7 1.5 .96 .89 6.7 3.6 2.1 2.5 1.9 4.0 2.4 1.5 .98 15 5.8 3.2 1.6 9.0 e201 8.8 3.9 2.8 2.0 1.3 .96 .87 .87 .90 .96 —— 291.99 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) SEPTEMBER 4 4 5 4 3 15 12 5 4 4 6 6 5 3 110 17 6 5 63 713 32 6 4 7 6 5 4 2 2 2 .01 .03 .01 .01 <.01 .36 .16 .03 .03 .03 .06 .05 .03 .01 20 .38 .07 .02 10 e2260 .89 .07 .03 .04 .02 .01 .01 < • 01 <.01 < • 01. 2292.36 186 RIO ORANDE DE LOIZA BASIN 50051150 QUEBRADA BLAHCA AT EL JAQDAL--Continued WATER QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 SILT AND CLAY PERCENT OF SUSPENDED SEDIMENT DATE NOV 1993 19.. . SEP 1994 20... STREAM- FLOW, INSTAN- TIMB TANEOUS (CFS) 1040 17 1330 111 SEDI- MENT, SUS- PENDED (MG/L) 84 135 SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) 3.9 40 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .062 MM 97 90 RIO GRANDE DB LOIZA BASIN 50051180 QUBBRADA SALVATIBRRA NEAR SAN LORENZO, PR LOCATION.--Lat 18°10'24 H , long 65°58'38 H , Hydrologic Unit 21010005, on left downstream side of bridge on Highway 181, 0.2 mi (0.3 km) upstream from Rio Grande de Loiza, and 1.5 mi (2.4 km) southwest of San Lorenzo. 187 DRAINAGE AREA.--3.74 mi' (9.69 Km'). WATER-DISCHARGE RECORDS PERIOD OF RECORD.—January 1984 to current year. GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 330 ft (100 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. Gage-height and precipitation satellite telemetry at station. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY OCT NOV DEC JAN FBB MAR APR MAY JUN JUL AUG SEP 1 e3.3 1.6 2 e3.3 1.5 3 e3.0 1.6 4 e2.9 1.8 5 e4 . 1 1.8 6 6.7 1.8 7 2.7 1.8 8 2.2 1.7 9 2.2 1.8 10 2.1 1.8 11 2.3 1.8 12 2.8 1.8 13 2.5 1.6 14 2.3 1.7 15 2.3 2.0 16 16 30 17 4.0 3.4 18 2.3 37 19 2.0 13 20 2.0 34 21 1.8 14 22 1.8 7.4 23 1.8 6.0 24 1.7 5.5 25 2.6 6.8 26 3.5 14 27 2.4 7.0 28 2.1 5.2 29 1.9 4.0 30 1.8 15 31 1.7 —— TOTAL 94.1 228.4 MEAN 3.04 7.61 MAX 16 37 MIN 1.7 1.5 AC-FT 187 453 CFSM .81 2.04 IN. .94 2.27 STATISTICS OF MONTHLY MEAN MEAN 9.60 14.3 MAX 36.2 33.4 (WY) 1986 1988 MIN 2.31 2.72 (WY) 1987 1990 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN-DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE INSTANTANEOUS LOW FLOW ANNUAL RUNOFF (AC-FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 4.4 3.7 2.7 4.2 2.6 2.2 2.0 2.0 2.1 2.0 1.7 1.9 1.8 1.8 1.7 1.8 1.8 2.1 2.1 2.0 2.1 2.0 1.8 1.7 1.6 1.6 2.0 1.7 1.7 1.6 1.7 66.1 2.13 4.4 1.6 131 .57 .66 DATA 5.50 22.8 1988 1.17 1990 FOR 1.7 1.6 1.5 1.4 2.8 2.2 2.0 2.0 2.1 2.2 1.7 1.7 3.3 3.7 1.9 1.7 1.6 1.5 1.4 1.3 1.7 1.5 1.3 1.2 1.2 1.2 1.2 1.2 1.3 1.5 1.4 54.0 1.74 3.7 1.2 107 .47 .54 FOR WATER 4.96 23.4 1992 1.16 1990 1.0 1.1 1.0 1.2 1.1 1.1 1.1 1.1 1.1 1.2 1.2 1.1 1.2 1.3 1.4 1.2 1.2 1.2 1.7 2.1 1.5 1.2 4.5 3.3 2.1 1.5 1.3 1.2 ___ ___ --- 41.2 1.47 4.5 1.0 82 .39 .41 YEARS 1984 3.28 10.3 1984 1.23 1990 13 7.0 2.6 1.9 1.6 1.5 1.5 1.4 1.7 1.8 1.7 4.6 1.7 1.4 1.2 1.2 1.2 1.1 1.2 1.2 1.2 1.1 1.1 1.1 1.1 1.2 1.4 1.2 1.1 1.2 1.3 63.5 2.05 13 1.1 126 .55 .63 - 1994 3.36 17.4 1989 1.15 1992 1993 CALENDAR YEAR 2053. 5. 259 . 4070 1. 20. 8. 2. 1. 95 63 Jul 11 74 Apr 25 90 Apr 1 50 43 7 4 2 1.2 1.2 1.2 1.2 1.1 1.3 1.9 1.4 1.1 1.2 1.5 1.4 1.1 1.1 1.0 1.1 1.1 1.1 1.1 1.1 1.0 1.1 .99 1.0 1.0 1.1 1.0 1.1 1.0 1.0 34.69 1.16 1.9 .99 69 .31 .35 , BY WATER 2.55 6.60 1985 .88 1984 FOR 1994 1416. 3. 314 . . 1830 10. . 2810 1. 14. 4. 1. . .96 .98 .96 1.2 1.4 1.6 1.3 1.3 2.0 2.0 1.3 1.1 1.1 1.6 1.2 1.1 .98 .99 .96 .81 .66 .65 .63 .61 .59 .57 .53 .54 .55 .54 .53 31.24 1.01 2.0 .53 62 .27 .31 YEAR (WY) 7.59 35.8 1985 1.01 1994 .51 .67 .55 .54 .57 2.3 .88 .70 .89 .75 .74 .78 .65 .49 .61 .63 1.5 1.3 .95 .71 .59 .54 .52 .50 .56 24 1.4 1.1 .94 1.9 --- 48.77 1.63 24 .49 97 .43 .49 6.42 15.0 1984 1.63 1994 WATER YEAR 35 88 45 54 25 42 04 09 4 3 63 Sep 20 Aug 17 May 26 Sep 20 Sep 20 Aug 18 1.2 .85 .79 .81 .75 .71 1.1 1.0 .82 .77 .73 .71 .67 .63 .64 .67 .69 21 2.0 1.2 .85 .76 .68 .65 .63 .61 .63 .60 .62 .60 .67 45.04 1.45 21 .60 89 .39 .45 5.51 20.5 1993 1.45 1994 WATER 6 10 3 472 9320 17 4760 1 23 10 2 .80 .73 .59 .55 .76 .79 .74 .63 .53 2.8 1.2 .75 .64 .59 .54 .51 .45 1.5 1.7 .98 .81 .72 .70 13 8.9 1.2 .94 .89 .92 .61 .49 46.96 1.51 13 .45 93 .41 .47 5.14 14.4 1988 1.51 1994 YEARS 1984 .57 .4 .19 Nov .29 Sep .41 May May .10 May .26 May .76 .87 .0 .95 .47 7.2 3.2 1.2 .83 33 12 3.4 4.3 3.5 11 3.9 1.8 1.3 53 32 18 5.7 26 314 99 10 5.1 3.9 2.1 1.7 1.4 1.3 1.1 .95 --- 662.35 22.1 314 .47 1310 5.90 6.59 11.1 29.0 1989 1.88 1990 - 1994 1988 1990 27 1987 12 1990 19 1990 17 1985 17 1985 30 1990 e Estimated 188 RIO GRANDE DE LOIZA BASIN 50051180 QUBBRADA SALVATIERRA NEAR SAN LORENZO, PR--Continue WATER-QUALITY RECORDS PERIOD OF RECORD.-- Water years 1984 to 1986 and water years 1989 to current year. PERIOD OF DAILY RECORD.-- SUSPENDED-SEDIMENT DISCHARGE! October 1984 to September 1986 and from October 1989 to September 1994. INSTRUMENTATION.-- USD-77 and automatic sediment sampler. REMARKS.— Sediment samples collected by a local observer on a weekly basis and during high flow events. EXTREMES FOR PERIOD OF DAILY RECORD.-- SEDIMENT CONCENTRATION! Maximum daily mean, 7,300 mg/L Oct. 06, 1985; Minimum daily mean, 1 mg/L several days. SEDIMENT LOADSi Maximum daily mean, 11,100 tons (10,100 tonnes) Jan. 05, 1992; Minimum daily mean, <0.01 ton (<0.1 tonne) several days. EXTREMES FOR WATER YEAR 1994.-- SEDIMENT CONCENTRATION! Maximum daily mean, 270 mg/L Sep. 20, 1994; Minimum daily mean, 2 mg/L several days. SEDIMENT LOADS: Maximum daily mean, 375 tons (340 tonnes) Sep. 20 1994; Minimum daily mean, <0.01 ton (<0.1 tonne) several days. SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) OCTOBER 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 3.3 3.3 3.0 2.9 4.1 6.7 2.7 2.2 2.2 2.1 2.3 2.8 2.5 2.3 2.3 16 4.0 2.3 2.0 2.0 1.8 1.8 1.8 1.7 2.6 3.5 2.4 2.1 1.9 1.8 1.7 9 9 10 11 14 13 5 4 4 4 4 7 11 8 4 36 13 10 10 11 11 8 6 7 9 9 5 3 3 3 3 .08 .09 .07 .09 .17 .26 .04 .02 .02 .02 .03 .05 .07 .06 .03 5.8 .18 .07 .06 .06 .05 .04 .04 .04 .14 .12 .03 .02 .02 .02 .02 NOVEMBER 1.6 1.5 1.6 1.8 1.8 1.8 1.8 1.7 1.8 1.8 1.8 1.8 1.6 1.7 2.0 30 3.4 37 13 34 14 7.4 6.0 5.5 6.8 14 7.0 5.2 4.0 15 3 3 3 3 3 3 4 4 4 3 2 2 3 4 4 198 9 83 49 84 36 13 10 10 16 33 12 11 8 38 ___ .02 .02 .02 .02 .02 .02 .02 .02 .02 .02 .01 .01 .02 .02 .02 122 .09 17 1.9 12 1.8 .27 .18 .14 .44 1.7 .23 .15 .11 2.5 4.4 3.7 2.7 4.2 2.6 2.2 2.0 2.0 2.1 2.0 1.7 1.9 1.8 1.8 1.7 1.8 1.8 2.1 2.1 2.0 2.1 2.0 1.8 1.7 1.6 1.6 2.0 1.7 1.7 1.6 1.7 DECEMBER 11 6 4 9 7 3 2 2 3 5 5 4 4 6 6 5 6 7 7 7 5 3 2 3 3 3 2 2 2 2 3 .15 .05 .03 .19 .05 .02 .02 .02 .02 .03 .03 .02 .02 .03 .03 .02 .03 .04 .04 .04 .03 .01 .01 .02 .02 .02 .02 .01 c.Ol .01 .02 TOTAL 94.1 7.81 228.4 160.79 66.1 1.05 DAY 1 2 3 4 5 6 7 e 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 RIO GRANDE DE LOIZA BASIN 50051180 QUEBRADA SALVATIERRA NEAR SAN LORENZO, PR-Continue SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 189 MEAN DISCHARGE (CPS) 1.7 1.6 1.5 1.4 2.8 2.2 2.0 2.0 2.1 2.2 1.7 1.7 3.3 3.7 1.9 1.7 1.6 1.5 1.4 1.3 1.7 1.5 1.3 1.2 1.2 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) JANUARY 4 3 2 4 5 5 5 4 3 4 6 11 14 9 3 2 2 2 3 3 3 4 5 5 4 .02 .01 .01 .02 .03 .04 .03 .02 .02 .02 .03 .05 .17 .15 .01 .01 .02 .02 .02 .02 .02 .02 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) FEBRUARY 1.0 1.1 1.0 1.2 1.1 1.1 1.1 1.1 1.1 1.2 1.2 1.1 1.2 1.3 1.4 1.2 1.2 1.2 1.7 2.1 1.5 1.2 4.5 3.3 2.1 2 2 2 2 2 2 2 2 2 2 3 3 3 2 4 2 2 3 4 5 5 5 13 23 13 .01 .01 .01 .01 .02 .02 .03 .02 .27 .23 .07 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) MARCH 13 7.0 2.6 1.9 1.6 1.5 1.5 1.4 1.7 1.8 1.7 4.6 1.7 1.4 1.2 1.2 1.2 1.1 1.2 1.2 1.2 1.1 1.1 1.1 1.1 29 17 3 2 2 2 3 3 3 3 3 12 4 3 3 2 2 2 2 2 2 2 2 2 2 4.3 .52 .02 .01 .01 .02 .02 .02 .02 .02 .31 .01 .02 .01 01 01 01 01 01 ,01 ,01 ,01 ,01 26 27 28 29 30 31 1.2 1.2 1.2 1.3 1.5 1.4 .01 .01 .01 .02 .02 .01 1.5 1.3 1.2 10 6 3 .04 .03 .01 1.2 1.4 1.2 1.1 1.2 1.3 ,01 ,01 ,01 ,01 ,01 ,01 54.0 0.83 41.2 0.77 63.5 5.31 190 RIO GRANDE DE LOIZA BASIN 50051180 QOBBRADA SALVATIBRRA NEAR SAN LORBNZO, PR-Continue SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MO/L) (TONS/DAY) DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN DISCHARGE (CPS) 1.2 1.2 1.2 1.2 1.1 1.3 1.9 1.4 1.1 1.2 1.5 1.4 1.1 1.1 1.0 1.1 1.1 1.1 1.1 1.1 1.0 1.1 .99 1.0 1.0 1.1 1.0 1.1 1.0 1.0 ___ MEAN CONCEN- TRATION (MG/L) APRIL 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 SEDIMENT DISCHARGE (TONS/DAY) < » OX •< • OX <.ox <.ox •< • OX •< • OX .01 < • OX < • OX <.01 <.01 4 • OX < • OX < • OX <.01 <.01 •< • OX < • OX <• OX 4 • OX •< • OX <.ox < » ox •< • OX <.01 < • OX < • OX <. ox <. ox 4 • OX MAY .96 .98 .96 1.2 1.4 1.6 1.3 1.3 2.0 2.0 1.3 1.1 1.1 1.6 1.2 1.1 .98 .99 .96 .81 .66 .65 .63 .61 .59 .57 .53 .54 .55 .54 .53 .01 .01 .01 .01 .01 .01 .01 .01 .04 .03 .02 .01 .01 .02 .02 .02 .02 .02 .01 .01 .01 .01 .01 .01 .01 .01 .01 .01 .01 .01 MEAN DISCHARGE (CPS) .51 .67 .55 .54 .57 2.3 .88 .70 .89 .75 .74 .78 .65 .49 .61 .63 1.5 1.3 .95 .71 .59 .54 .52 .50 .56 24 1.4 1.1 .94 1.9 MEAN CONCEN- TRATION (MO/L) JUNE 2 2 2 4 5 12 13 12 11 10 10 10 11 15 17 12 4 3 2 2 2 2 2 2 2 59 11 13 16 22 SEDIMENT DISCHARGE (TONS/DAY) .01 .01 .01 .01 .01 .09 .03 .02 .02 .02 .02 .02 .02 .02 .02 .02 .02 .01 .01 .01 .01 .01 .01 .01 .01 7.6 .04 .03 .04 .14 TOTAL 34.69 0.01 31.24 0.22 48.77 8.18 797 RXO GRANDE DB LOXZA BASIN 50051180 QDBBRADA SALVATXBRRA NEAR SAN LORBNZO, PR-Continu* SEDIMENT DXSCHAROB, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN MEAN CONCEN- SEDIMENT DXSCHAROB TRATXON DISCHARGE DAY (CFS) (MO/I.) (TONS/DAY) JULY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL YEAR 1.2 .85 .79 .81 .75 .71 1.1 1.0 .82 .77 .73 .71 .67 .63 .64 .67 .69 21 2.0 1.2 .85 .76 .68 .65 .63 .61 .63 .60 .62 .60 .67 45.04 1416.35 22 19 16 14 11 10 10 10 10 8 7 7 6 5 4 3 3 52 13 8 6 6 8 12 13 8 4 5 7 7 6 •-- .08 .04 .04 .03 .02 .02 .03 .02 .02 .02 .02 .02 .02 .01 •c.Ol <.01 •c.Ol 6.2 .09 .03 .02 .02 .02 .02 .02 .01 <.01 .01 .02 .02 .02 6.89 655.30 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATXON DISCHARGE (CFS) (MO/L) (TONS/DAY) AUGUST .80 .73 .59 .55 .76 .79 .74 .63 .53 2.8 1.2 .75 .64 .59 .54 .51 .45 1.5 1.7 .98 .81 .72 .70 13 8.9 1.2 .94 .89 .92 .61 .49 46.96 5 5 5 7 8 7 5 4 4 8 10 11 8 6 4 4 4 5 4 2 3 3 3 30 25 7 5 4 4 5 7 .02 .01 •c.Ol .01 .02 .02 .01 <.01 •c.Ol .12 .04 .02 .02 .01 •c.Ol •e.Ol •c.Ol .02 .02 •e.Ol <.01 <.01 <.01 2.6 1.1 .03 .02 .02 .02 <.01 •c.Ol MEAN MEAN CONCEN- SEDIMENT DXSCHAROB TRATXON DISCHARGE (CFS) (MO/L) (TONS/DAY) SEPTEMBER 4.13 .47 7.2 3.2 1.2 .83 33 12 3.4 4.3 3.5 11 3.9 1.8 1.3 53 32 18 5.7 26 314 99 10 5.1 3.9 2.1 1.7 1.4 1.3 1.1 .95 662.35 6 20 21 20 20 72 26 20 16 9 29 11 5 5 104 69 46 20 52 270 36 8 5 4 •e.Ol .81 .19 .07 .04 9.1 1.0 .19 .26 .18 1.2 .15 .02 .02 32 6.7 2.5 .37 18 375 11 .30 .06 .04 .02 .02 .02 .02 .02 .01 459.31 192 RIO GRANDE DE LOIZA BASIN 50051180 QUBBRADA SALVATIERRA NEAR SAN LORENZO--Continued HATER QUALITY DATA, HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 SILT AND CLAY PERCENT OF SUSPENDED SEDIMENT DATE NOV 1993 16... JOT, 1994 18... SEP 20.. . 20... 20... TIME 0400 1320 1215 1250 1820 STREAM- FLOW, INSTAN- TANEOUS (CPS) 156 5.9 385 272 291 SEDI- MENT, SUS- PENDED (MG/L) 2210 206 3060 794 84 SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) 931 3.3 3180 583 66 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .062 MM 91 97 99 83 88 RIO GRANDE DB LOIZA BASIN 50051310 RIO CAYAQUAS AT CBRRO GORDO, PR LOCATION.--Lat 18°09'13", long 65°57'20", Hydrologic Unit 21010005, at downstream side of bridge on Highway 912, at Barrio Cerro Qordo, 2.8 mi (4.5 km) south of San Lorenzo. 193 DRAINAGE AREA.--10.2 ml 1 (26.4 km 1 ). WATER-DISCHARGE RECORDS PERIOD OP RECORD.--October 1977 to current year. GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 490 ft (150 m), from topographic map. Prior to Oct. 1, 1983, at site 2,000 ft (610 m) downstream at different datum. REMARKS.--Records poor. Sand removal at a commercial level is practiced at times during the year. This takes place about one hundred feet downstream from the low water control. Gage-height and precipitation satellite telemetry at station. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY OCT NOV DEC JAN FBB MAR APR MAY JUN JUL AUQ SEP 1 78 22 2 42 23 3 33 23 4 32 21 5 36 21 6 136 22 7 75 23 8 40 28 9 35 26 10 32 36 11 32 29 12 35 24 13 30 25 14 29 37 15 29 33 16 43 97 17 41 95 18 30 113 19 27 111 20 27 247 21 26 157 22 27 78 23 36 45 24 28 48 25 33 38 26 80 78 27 29 44 28 97 33 29 47 30 30 26 80 31 23 --- TOTAL 1314 1687 MEAN 42.4 56.2 MAX 136 247 MIN 23 21 AC-FT 2610 3350 CFSM 4.16 5.51 IN. 4.79 6.15 STATISTICS OF MONTHLY MEAN MEAN 62.9 73.3 MAX 176 196 (WY) 1986 1988 MIN 14.4 19.2 (WY) 1992 1982 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN- DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE INSTANTANEOUS LOW FLOW ANNUAL RUNOFF (AC-FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 49 33 30 31 39 42 30 29 31 31 28 28 28 28 28 29 26 28 25 24 25 25 24 25 26 25 29 41 30 31 26 924 29.8 49 24 1830 2.92 3.37 DATA 46.0 163 1988 12.5 1992 FOR 34 34 31 26 30 27 25 26 37 48 34 28 52 68 30 30 27 28 25 24 25 24 24 26 25 27 23 24 25 23 22 932 30.1 68 22 1850 2.95 3.40 FOR WATER 30.0 50.0 1993 14.6 1990 21 19 19 20 20 22 e21 e21 e21 e20 e21 e21 e20 e23 e25 e20 e20 e24 e!20 288 e33 e22 e50 e35 e28 e25 e25 28 ___ ___ --- 1032 36.9 288 19 2050 3.61 3.76 YEARS 1977 27.3 67.5 1984 11.0 1992 28 26 25 23 22 22 21 22 22 24 22 26 21 20 19 19 19 18 18 18 17 17 17 17 17 17 16 16 17 17 15 618 19.9 28 15 1230 1.95 2.25 - 1994 21.8 45.4 1989 11.3 1992 1993 CALENDAR YEAR 17322 47. 1130 13 14 34360 4. 63. 80 29 16 5 Jul 11 Apr 17 Apr 17 65 17 15 14 14 14 14 13 13 13 13 13 14 13 12 12 13 14 14 15 13 12 12 13 13 13 13 13 12 12 12 12 --- 393 13.1 15 12 780 1.28 1.43 12 12 12 12 13 14 12 12 26 29 22 19 26 33 22 19 18 16 15 15 14 13 13 12 12 12 11 11 11 10 10 488 15.7 33 10 968 1.54 1.78 9.9 9.3 9.2 9.8 9.4 12 10 8.8 8.8 8.5 8.8 8.9 8.5 8.5 9.4 11 14 12 10 8.9 8.4 8.1 8.1 7.9 8.3 35 16 14 13 12--- 326.5 10.9 35 7.9 648 1.07 1.19 12 12 15 14 11 11 12 12 11 10 9.9 9.5 9.3 9.2 9.1 8.9 9.0 138 19 15 13 12 11 11 10 10 10 9.9 10 9.8 13 476.6 15.4 138 8.9 945 1.51 1.74 13 12 11 12 13 11 14 12 12 13 14 11 9.9 9.5 9.4 8.9 8.7 16 16 11 9.7 10 9.6 60 63 14 12 11 10 9.9 9.7 456.3 14.7 63 8.7 905 1.44 1.66 9.8 13 11 9.7 9.7 16 15 12 13 13 14 12 11 11 34 25 20 13 24 921 60 39 33 30 26 24 22 20 18 17--- 1496.2 49.9 921 9.7 2970 4.89 5.46 , BY WATER YEAR (WY) 20.4 46.0 1985 10.7 1980 FOR 1994 10143 27 921 7 8 8150 19 7 20120 2 36 39 20 9 48.1 155 1985 9.68 1990 WATER YEAR .6 .8 Sep 20 .9 Jun 24 .5 Jun 19 Sep 20 .85 Sep 20 .7 Jun 24 .72 .99 .9 47.1 140 1979 10.9 1994 44.0 118 1979 15.4 1994 WATER 43 89 18 2900 7 8 13200 9 7 31530 4 57 67 24 12 45.5 202 1979 14.5 1991 YEARS 1977 .5 .7 .6 Aug . 1 Feb . 5 Jun Aug . 4 4 Aug . 1 Feb .27 .98 55.3 216 1979 16.9 1980 - 1994 1979 1990 31 1979 4 1981 19 1994 31 1979 31 1979 4 1981 e Estimated 194 RIO GRANDB DB LOIZA BASIN 50051800 RIO GRANDB DB LOIZA AT HWY 183 NEAR SAN LORENZO, PR LOCATION.--Lat 18«11'09", long 65«57'42 H , Hydrologic Unit 21010005, at upstream aide of bridge on Highway 183 by-pass, 0.4 mi (0.6 km) south from Plaza de San Lorenzo, 1.4 mi (2.2 km), southwest from Bscuela Rafael Col6n Garcia and 2.0 mi (3.2 km) northwest from Bscuela Segunda Unidad de Carloa Zayas. DRAINAGE AREA.--25.0 mi 1 (64.8 km 1 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--February 1990 to current year. GAGE.--Water-stage recorder. Elevation of gage is 262 ft (80 m), from topographic map. REMARKS.--Records poor. Water purification plant located about 0.2 mi (0.3 km) upstream from gage. Gage-height and precipitation satellite telemetry at station. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY OCT NOV DEC JAN FBB MAR MAY JUN JUL AUG SEP 1 139 53 2 100 52 3 87 51 4 83 49 5 86 46 6 190 49 7 127 49 8 89 54 9 81 58 10 74 69 11 71 59 12 90 49 13 67 49 14 66 67 15 64 65 16 109 179 17 95 145 18 68 243 19 63 235 20 61 297 21 61 e256 22 61 el90 23 84 e!50 24 68 e!30 25 72 e!40 26 144 e228 27 67 132 28 108 104 29 76 92 30 59 e202 31 57 --- TOTAL 2667 3542 MEAN 86.0 118 MAX 190 297 MIN 57 46 AC-FT 5290 7030 CFSM 3.44 4.72 IN. 3.97 5.27 STATISTICS OP MONTHLY MEAN MEAN 128 144 MAX 266 222 (WY) 1991 1992 MIN 77.6 113 (WY) 1993 1991 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN-DAY MINIMUM INSTANTANEOUS PEAK PLOW INSTANTANEOUS PEAK STAGE ANNUAL RUNOFF (AC- FT) ANNUAL RUNOFF (CPSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS e!07 e94 85 103 100 101 82 75 74 70 69 67 65 64 62 62 59 65 61 58 59 59 58 56 56 51 51 79 60 59 49 2160 69.7 107 49 4280 2.79 3.21 DATA 87.4 110 1993 69.7 1994 FOR 54 59 50 47 71 56 58 57 72 106 80 72 e84 el70 e86 e78 e70 e70 e66 e60 59 58 55 55 54 61 52 56 55 57 55 2083 67.2 170 47 4130 2.69 3.10 49 50 51 54 53 53 46 46 43 41 45 44 43 61 66 43 45 48 94 elOOO e!80 e86 e!60 el70 elOO e68 e60 e54 ___ ___ --- 2853 102 1000 41 5660 4.08 4.25 FOR WATER YEARS 1990 109 192 1992 62.9 1991 61.1 102 1994 21.0 1992 e!20 e!50 e74 e62 e52 e48 e45 48 50 59 47 104 56 41 44 40 40 37 36 37 36 34 35 34 33 36 34 33 40 47 36 1588 51.2 150 33 3150 2.05 2.36 - 1994 39.6 51.2 1994 17.4 1992 1993 CALENDAR YEAR 37064 102 1890 24 27 73520 4. 55. 184 72 40 Jul 11 Apr 7 Apr 1 06 15 33 31 30 31 29 30 33 33 29 30 33 39 30 28 29 33 33 35 30 27 27 25 27 25 26 23 22 23 24 20 --- 868 28.9 39 20 1720 1.16 1.29 19 19 19 23 28 46 29 29 76 121 60 42 56 78 47 43 36 27 25 21 22 22 23 19 22 20 19 e!8 17 e!6 e!7 1059 34.2 121 16 2100 1.37 1.58 17 e!7 el5 e!5 15 66 31 18 18 17 17 20 19 15 25 50 68 83 49 34 29 28 25 24 23 284 90 58 53 46 --- 1269 42.3 284 15 2520 1.69 1.89 43 33 48 76 40 34 35 37 30 27 23 19 18 16 16 16 16 343 102 47 40 34 28 26 24 23 23 23 22 21 29 1312 42.3 343 16 2600 1.69 1.95 44 29 22 20 30 23 26 27 22 43 50 30 23 20 18 17 14 65 68 31 23 20 21 106 219 57 41 34 30 25 21 1219 39.3 219 14 2420 1.57 1.81 21 52 40 26 25 84 81 39 51 44 100 59 37 31 183 178 126 61 97 1870 238 134 104 103 78 69 58 52 47 44 4132 138 1870 21 8200 5.51 6.15 , BY WATER YEAR (WY) 29.4 41.5 1993 16.8 1992 FOR 1994 24752 67. 1870 14 16 15100 21. 49100 2. 36. 107 50 21 78.5 186 1992 34.2 1994 WATER YEAR 8 Sep 20 Aug 17 May 30 Sep 20 81 Sep 20 71 83 124 290 1992 42.3 1994 102 208 1993 42.3 1994 WATER 97 134 67 3380 6 7 28200 27 70430 3 52 157 56 22 86.1 132 1992 39.3 1994 YEARS 1990 - .2 .8 Jan 5 .3 Apr 29 .4 Apr 25 Jan 5 . 3 6 Jan 5 .89 .84 131 255 1992 59.7 1990 1994 1992 1994 1992 1992 1992 1992 1992 e Estimated RIO ORANDB DE LOIZA BASIN 50051900 RIO ORANDB DE LOIZA AT HOT 193 NEAR SAN LORENZO, PR—Continued WATER-QUALITY RECORDS PERIOD OF RECORD.-- Water years 1990 to current year. PERIOD OF DAILY RECORD.-- SUSPENDED-SEDIMENT DISCHARGEi February 1990 to September 1994 INSTRUMENTATION.— DH-49 and automatic sediment sampler. REMARKS.— Sediment samples collected by a local observer on a weekly basis and during high flow events. EXTREMES FOR PERIOD OF DAILY RECORD.-- SEDIMENT CONCENTRATIONi Maximum daily mean, 2,340 mg/L Sept. 20, 1994; Minimum daily mean, 5 mg/L Several days. SEDIMENT LOADSi Maximum daily mean, 46,900 tons (42,400 tonnes) Jan. 05, 1992; Minimum daily mean, 0.20 ton (0.19 tonne) May 05, 1992. EXTREMES FOR WATER YEAR 1994.-- SEDIMENT CONCENTRATIONi Maximum daily mean, 2,340 mg/L Sep. 20, 1994; Minimum daily mean, 6 mg/L Oct. 11, 1993. SEDIMENT LOADS: Maximum daily mean, 36,300 tons (32,900 tonnes) Sep. 20, 1994; Minimum daily mean, 0.45 ton (0.41 tonne) Jul. 25, 1994. 195 SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCBN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) OCTOBER 1 2 3 4 5 6 7 9 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 29 29 30 31 139 100 97 93 96 190 127 99 91 74 71 90 67 66 64 109 95 69 63 61 61 61 94 69 72 144 67 108 76 59 57 125 60 57 57 57 291 111 45 29 16 6 53 11 10 10 67 73 16 10 14 74 62 49 36 45 154 31 92 62 56 65 51 16 13 13 13 163 41 11 6.2 3.1 1.2 15 2.0 1.9 1.7 36 22 3.0 1.7 2.3 13 10 11 6.7 15 79 5.7 45 14 9.0 10 NOVEMBER 53 52 51 49 46 49 49 54 59 69 59 49 49 67 65 179 145 243 235 297 e256 el 90 e!50 e!30 e!40 e229 132 104 92 e202 72 79 94 90 70 55 40 26 33 40 49 59 72 97 109 242 179 256 164 356 304 155 39 19 19 196 125 70 49 149 10 11 12 11 9.6 7.2 5.3 3.9 5.1 7.5 7.6 7.9 9.9 16 19 132 91 205 107 366 e229 e79 e!6 e6.3 e6.9 el!2 45 20 12 e99 DECEMBER e!07 e94 95 103 100 101 92 75 74 70 69 67 65 64 62 62 59 65 61 59 59 59 59 56 56 51 51 79 60 59 49 59 49 46 77 70 33 26 16 27 39 49 59 67 60 52 43 35 33 26 23 35 49 50 49 41 33 27 52 23 40 56 e22 e!2 11 25 20 9.2 5.6 3.1 5.4 7.3 9.2 11 12 10 9.6 7.1 5.7 5.7 4.3 3.5 5.5 7.5 9.0 7.3 6.2 4.5 3.7 12 3.7 6.4 7.4 TOTAL 2667 634.4 3542 1667.9 2160 269.9 e Estimated 196 RIO GRANDE DE LOIZA BASIN 50051800 RIO GRANDE DE LOIZA AT HWY 183 NEAR SAN LORENZO, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MO/L) (TONS/DAY) FEBRUARY MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) MEAN DISCHARGE (CFS) JANUARY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 54 59 50 47 71 56 58 57 72 106 80 72 •84 • 170 •86 •78 •70 •70 •66 •60 59 58 55 55 54 61 52 56 55 57 55 45 29 12 12 92 77 61 40 87 102 59 35 34 35 30 21 18 27 33 28 24 20 18 16 19 24 30 35 33 32 33 6.2 4.6 1.7 1.6 19 11 9.5 6.1 20 30 13 6.9 •7.8 • 16 •7.0 •4.4 •3.3 •5.1 •5.8 •4.7 •3.8 3.1 2.7 2.4 2.8 4.0 4.2 5.3 5.1 4.7 4.9 49 50 51 54 53 53 46 46 43 41 45 44 43 61 66 43 45 48 94 •1000 •180 • 86 •160 •170 •100 • 68 • 60 • 54 ___ ___ ___ 49 50 51 54 53 53 46 46 43 41 45 44 43 61 66 43 45 48 94 «1000 «180 «86 «160 «170 «100 «68 «60 • 54 33 38 48 85 75 50 34 35 38 47 66 51 27 29 52 31 31 33 102 977 115 93 118 86 74 90 117 122 4.5 5.1 6.6 13 11 7.3 4.2 4.3 4.4 5.3 7.9 6.1 3.1 6.8 10 3.7 3.8 4.2 36 •2450 •56 •21 •51 •39 •20 •17 •19 •18 MEAN DISCHARGE (CFS) • 120 • 150 •74 •62 •52 •48 •45 48 50 59 47 104 56 41 44 40 40 37 36 37 36 34 35 34 33 36 34 33 40 47 36 MEAN CONCEN- TRATION (MG/L) MARCH 108 92 77 62 47 33 20 23 33 46 57 107 34 10 31 62 62 59 51 42 34 32 36 58 79 77 71 61 75 90 60 SEDIMENT DISCHARGE (TONS/ DAY) • 35 •37 • 15 • 10 •6.6 •4.2 •2.4 3.0 4.5 7.4 7.3 44 5.6 1.2 3.7 6.7 6.5 5.8 4.9 4.9 3.4 3.0 3.5 5.5 7.0 7.3 7.2 5.4 8.2 12 6.1 TOTAL 2083 226.7 2853 2838.3 1588 284.3 • Estimated RIO GRANDE DE LOIZA BASIN 50051800 RIO GRANDE DE LOIZA AT HWY 183 NEAR SAN LORENZO, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), NATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 197 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/ DAY) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 33 31 30 31 29 30 33 33 29 30 33 39 30 28 29 33 33 35 30 27 27 25 27 25 26 23 22 23 24 20 APRIL 29 19 19 19 48 102 88 69 68 66 314 102 157 149 126 109 95 82 97 113 110 109 122 136 147 131 117 109 95 91 ___ 2.7 1.6 1.5 1.7 3.9 8.5 7.6 6.1 5.4 5.4 26 9.9 13 12 10 9.8 8.4 7.5 8.1 8.6 8.4 7.5 9.1 9.5 9.9 8.3 7.0 6.9 6.3 5.0 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) MAY MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) JUNE 19 19 19 23 28 46 29 29 76 121 60 42 56 78 47 43 36 27 25 21 22 22 23 19 22 20 19 e!8 17 «16 «17 92 94 90 86 82 75 65 55 476 102 116 100 85 74 68 66 72 84 113 184 152 117 94 104 151 155 151 150 160 199 185 4.7 4.9 4.8 5.4 6.1 9.4 5.4 4.3 116 36 19 11 13 16 9.3 7.5 7.1 5.9 7.8 12 9.5 7.2 5.9 5.3 8.8 8.6 7.9 e7.4 7.4 e8.7 «8.4 17 «17 «15 «15 15 66 31 18 18 17 17 20 19 15 25 50 68 83 49 34 29 28 25 24 23 284 90 58 53 46 177 164 140 113 79 681 112 51 51 56 57 58 62 76 100 87 75 60 39 24 27 23 23 22 22 418 102 27 21 23 8.3 «7.6 «5.8 e4.6 3.2 135 11 2.5 2.5 2.5 2.6 3.1 3.1 3.1 6.9 12 13 14 5.2 2.3 2.1 1.7 1.6 1.4 1.3 641 27 4.2 3.0 2.9 TOTAL 868 235.6 1059 390.7 1269 934.5 « Estimated 198 RIO GRANDS DE LOIZA BASIN 50051800 RIO GRANDS DE LOIZA AT HWY 183 NEAR SAN LORENZO, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CPS) (MG/L) (TONS/DAY) (CPS) (MG/L) (TONS/DAY) (CPS) (MG/L) (TONS/DAY) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL YEAR 43 33 48 76 40 34 35 37 30 27 23 19 18 16 16 16 16 343 102 47 40 34 28 26 24 23 23 23 22 21 29 1312 24752 JULY 28 31 37 39 25 23 19 13 11 10 9 16 22 20 16 14 12 630 278 26 14 9 8 7 7 10 12 12 11 10 9 —— AOGDST 3.3 2.8 6.3 9.4 2.7 2.1 1.8 1.3 .93 .69 .55 .85 1.1 .84 .68 .59 .50 1840 91 3.4 1.5 .79 .62 .53 .45 .59 .76 .71 .65 .55 .71 1978.69 47299.82 44 29 22 20 30 23 26 27 22 43 50 30 23 20 18 17 14 65 68 31 23 20 21 106 219 57 41 34 30 25 21 1219 9 9 9 21 62 36 25 13 29 65 94 88 88 87 85 76 45 70 44 26 19 12 13 131 259 36 18 11 7 9 11 —— 1.0 .72 .56 1.1 5.1 2.4 1.7 1.0 1.7 9.3 13 7.3 5.7 4.8 4.2 3.4 1.8 20 9.5 2.3 1.2 .68 .70 204 228 6.0 2.1 1.0 .53 .60 .64 542.03 SEPTEMBER 21 52 40 26 25 84 81 39 51 44 100 59 37 31 183 178 126 61 97 1870 238 134 104 103 78 69 58 52 47 44 --- 4132 14 47 28 16 16 72 70 26 34 36 89 42 26 19 197 205 118 38 53 2340 598 205 15 9 8 8 8 8 12 17 --- —— .80 7.7 3.3 1.1 1.0 20 18 2.8 6.7 4.4 35 7.2 2.6 1.7 159 122 48 6.5 54 36300 401 78 4.4 2.4 1.8 1.5 1.3 1.1 1.5 2.0 --- 37296.80 RIO GRANDB DE LOIZA BASIN 50051800 RIO GRANDB DB LOIZA AT HWY 183 NEAR SAN LORBNZO, PR—Continued WATER QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT 199 DATE AUG 1994 26... TIME 1100 DIS- CHARGE, INST. CUBIC FEET PER SECOND 44 SEDI- MENT, SUS- PENDED (MG/L) 959 SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) 114 SED. SUSP. FALL DIAM. SED. SUSP. FALL DIAM. SED. SUSP. FALL DIAM. PERCENT PERCENT PERCENT FINER FINER FINER THAN THAN THAN .002 MM .004 MM .008 MM 81 88 DATE AUG 1994 26... SBD. SUSP. FALL DIAM. PERCENT FINER THAN 016 MM SED. SUSP. FALL DIAM. PERCENT FINER THAN .031 MM SBD. SUSP. SIEVE DIAM. PERCENT FINER THAN .062 MM SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .125 MM SBD. SUSP. SIEVE DIAM. PERCENT FINER THAN .250 MM SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .500 MM SBD. SUSP. SIEVE DIAM. PERCENT FINER THAN 1.00 MM 91 93 99 99.7 99.9 100 100 200 RIO GRANDE DE LOIZA BASIN 50051800 RIO GRANDE DE LOIZA AT HWY 183 NEAR SAN LORENZO, PR—Continued WATER QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 SILT AND CLAY PERCENT OF SUSPENDED SEDIMENT DATE OCT 1993 06... NOV 19... MAY 1994 13.. . JDN 06... JUL 18.. . SEP 22... TIME 1000 1000 1000 0940 1300 0930 STREAM- PLOW, INSTAN- TANEOUS (CPS) 224 268 37 40 458 121 SEDI- MENT, SUS- PENDED (MG/L) 752 153 1180 1260 1250 251 SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) 454 111 118 136 1540 82 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .062 MM 97 95 99 98 94 98 RIO GRANDE DE LOIZA BASIN SOOS302S RIO TURABO ABOVE BORINQUBN, PR LOCATION.--Lat 18°09'35", long 66°02'26», Hydrologic Unit 21010005, on left bank at Highway 765, 1.2 mi (1.9 km) south of Villa Boringuen, 8.1 mi (13.0 km) upstream from Rio Grande de Loiza. 201 DRAINAGE AREA.--7.14 mi> (18.49 km' ). HATER-DISCHARGE RECORDS PERIOD OP RECORD.--January 1990 to current year. GAGE.--Hater-stage recorder and crest-stage gage. Elevation of gage is 492 ft (ISO m), from topographic map. RBHARKS.--Records fair except those for estimated daily discharges, which are poor. Gage-height and precipitation satellite telemetry at station. DISCHARGE, CUBIC FEET PER SECOND, HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY OCT NOV JAN PEB MAR APR JUN AUG SEP 1 17 7.5 2 13 7.2 3 11 6.9 4 11 6.9 S 11 6.S 6 18 6.3 7 13 6.3 8 10 8.0 9 9.1 8.0 10 8.6 8.0 11 11 7.6 12 20 6.8 13 9.1 7.2 14 8.3 7.3 IS 8.1 8.0 16 10 e42 17 9.6 e21 18 8.3 e87 19 7.9 e24 20 7.8 el!2 21 7.5 64 22 9.3 30 23 13 21 24 9.0 24 25 9.0 18 26 9.9 34 27 7.9 21 28 7.5 16 29 8.0 13 30 7.8 34 31 7.7 TOTAL 318.4 669.5 MEAN 10.3 22.3 MAX 20 112 MIN 7.5 6.3 AC-PT 632 1330 CPSM 1.44 3.13 IN. 1.66 3.49 STATISTICS OP MONTHLY MEAN MEAN 20.0 24.4 MAX 48.2 37.9 (WY) 1991 1992 MIN 10.3 18.7 (WY) 1994 1991 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN-DAY MINIMUM INSTANTANEOUS PEAK PLOW INSTANTANEOUS PEAK STAGE INSTANTANEOUS LOW PLOH ANNUAL RUNOPP (AC-PT) ANNUAL RUNOPP (CPSM) ANNUAL RUNOPP (INCHES) 10 PERCENT EXCEEDS SO PERCENT EXCEEDS 90 PERCENT EXCEEDS 18 14 13 21 18 15 13 12 11 11 9.8 10 9.8 9.8 9.4 9.0 9.0 11 8.7 7.8 7.5 7.2 7.1 6.8 7.1 6.8 7.1 12 9.4 8.6 7.4 327.3 10.6 21 6.8 649 1.48 1.71 DATA 15.9 23.1 1991 10.6 1994 FOR 10 9.2 12 13 16 10 8.5 7.8 9.9 18 12 11 14 28 12 11 10 10 9.0 9.0 8.4 7.5 7.5 7.4 7.2 8.5 7.2 7.1 6.6 6.6 7.8 322.2 10.4 28 6.6 639 1.46 1.68 FOR HATER 19.5 47.5 1992 7.85 1990 7.3 7.9 8.0 8.2 8.1 7.6 7.5 7.0 6.5 6.7 7.0 6.5 6.4 12 8.5 6.8 6.6 6.9 8.7 131 19 14 78 30 16 13 11 11___ ___ --- 467.2 16.7 131 6.4 927 2.34 2.43 YEARS 1990 13.4 18.1 1991 8.93 1990 38 23 15 12 11 10 9.8 9.5 9.5 11 8.9 29 12 10 9.1 8.9 8.7 8.4 8.0 7.9 7.7 7.5 7.5 7.5 7.1 8.5 7.7 7.4 8.2 8.8 7.7 345.3 11.1 38 7.1 685 1.56 1.80 - 1994 10.1 11.6 1991 7.35 1993 1993 CALENDAR YEAR 7417. 20. 510 5. 5. 14710 2. 38. 33 11 6. 2 3 Jul 11 6 Apr 24 8 Mar 30 85 64 8 7.0 6.9 6.7 7.2 6.7 7.4 9.2 8.8 7.2 12 13 7.4 6.6 7.4 7.1 6.5 7.1 6.7 6.2 6.2 5.8 6.4 5.8 5.8 5.8 5.9 5.6 5.7 5.7 5.7 211.5 7.05 13 5.6 420 .99 1.10 5.7 5.5 5.3 5.8 7.6 6.7 5.4 5.1 12 14 7.7 6.1 5.5 6.1 7.5 6.2 5.2 5.1 5.1 5.3 5.3 5.1 5.3 5.1 5.1 5.1 5.1 5.1 5.0 5.1 5.1 189.3 6.11 14 5.0 375 .86 .99 5.1 5.0 5.0 4.8 4.8 17 5.5 4.5 4.5 4.3 4.4 4.3 4.4 4.3 6.7 5.7 16 12 8.4 5.3 .3 .4 .5 .3 .3 97 10 11 9.4 7.7 --- 288.9 9.63 97 4.3 573 1.35 1.51 6.8 5.5 19 15 7.5 6.7 6.2 5.9 5.1 5.0 5.1 4.9 4.9 4.9 4.9 4.6 eS.4 86 ell 7.4 6.7 5.7 5.2 .6 .1 .1 .2 .2 .2 .2 .7 273.7 8.83 86 4.1 543 1.24 1.43 5.1 .2 .1 .5 .6 .3 .2 .2 .1 5.1 4.9 3.9 3.7 3.8 3.8 3.5 3.3 ell e8.6 3.7 3. -6 4.3 3.9 36 43 7.6 5.4 4.6 5.1 4.3 4.1 216.5 6.98 43 3.3 429 .98 1.13 4.1 6.2 5.4 4.3 4.3 e27 e!4 7.7 e6.8 e6.8 e36 11 7.3 6.0 e81 e64 e22 12 28 273 e34 19 e!6 e!8 e!6 e!2 ell 11 elO 9.0 782.9 26.1 273 4.1 1550 3.65 4.08 , BY HATER YEAR (WY) 7.98 10.7 1993 6.18 1990 FOR 1994 4412. 12. 273 3. 3. 1120 11. 3. 8750 1. 22. 18 7. 4. 17.6 31.9 1993 6.11 1994 WATER YEAR 7 1 Sep 20 3 Aug 17 8 Aug 11 Sep 20 01 Sep 20 3 Aug 17 69 99 6 5 24.1 48.9 1992 9.59 1991 23.8 54.6 1993 8.83 1994 HATER 18 24 12 60S 3 3 3590 14 3 13520 2 35 29 9 5 16.9 22.8 1993 6.98 1994 YEARS 1990 .7 .0 .1 Jan .3 Aug .8 Aug Jan .37 Jan .3 Aug .61 .52 .9 .6 21.0 28.1 1992 14.1 1990 - 1994 1992 1994 5 1992 17 1994 11 1994 5 1992 5 1992 17 1994 e Estimated 202 RIO GRANDE DE LOIZA BASIN 50053025 RIO TURABO ABOVE BORINQUBN, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORD.-- Water years 1990 to current year. PERIOD OF DAILY RECORD.-- SUSPENDED-SEDIMENT DISCHARGE: January 1990 to September 1994 INSTRUMENTATION.— DH-48 and automatic sediment sampler. REMARKS.-- Sediment samples were collected by a local observer on a weekly basis and during high flow events. EXTREMES FOR PERIOD OF DAILY RECORD.— SEDIMENT CONCENTRATIONi Maximum daily mean, 1030 mg/L Jul. 11, 1994; Minimum daily mean, 1 mg/L Several days. SEDIMENT LOADS i Maximum daily mean, 4,920 tons (4,460 tonnes) Jan. 05, 1992; Minimum daily mean, 0.01 ton (0.01 tonne) Several days. EXTREMES FOR WATER YEAR 1994.-- SEDIMENT CONCENTRATION: Maximum daily mean, 649 mg/L Sep. 20, 1994; Minimum daily mean, 2 mg/L Several days. SEDIMENT LOADS i Maximum daily mean, 844 tons (766 tonnes) Sep. 20, 1994; Minimum daily mean, 0.02 ton (0.02 tonne) Several days. SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) OCTOBER IAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 ?OTA1 MEAN DISCHARGE (CFS) 17 13 11 11 11 18 13 10 9.1 8.6 11 20 9.1 8.3 8.1 10 9.6 8.3 7.9 7.8 7.5 9.3 13 9.0 9.0 9.9 7.9 7.5 8.0 7.8 7.7 [> 318.4 27 28 10 10 10 9 8 8 10 10 15 42 28 29 31 30 26 41 12 12 12 12 11 8 8 10 13 16 17 18 18 1.1 .93 .28 .28 .30 .45 .29 .22 .23 .23 1.3 4.9 .69 .63 .63 .81 .68 .92 .26 .24 .24 .28 .37 .21 .20 .28 .27 .31 .35 .37 .36 MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) NOVEMBER 7.5 7.2 6.9 6.9 6.5 6.3 6.3 8.0 8.0 8.0 7.6 6.8 7.2 7.3 8.0 e42 e21 e87 e24 el!2 64 30 21 24 18 34 21 16 13 34 18 17 17 15 13 12 10 9 11 12 14 17 19 20 20 85 33 228 31 289 139 46 40 43 38 57 48 51 54 67 .35 .34 .32 .28 .23 .19 .17 .21 .24 .24 .27 .29 .33 .37 .43 e23 e3.1 ellS e2.0 e223 37 3.8 2.4 3.1 1.9 6.2 2.9 2.2 2.0 7.8 DECEMBER 18 14 13 21 18 15 13 12 11 11 9.8 10 9.8 9.8 9.4 9.0 9.0 11 8.7 7.8 7.5 7.2 7.1 6.8 7.1 6.8 7.1 12 9.4 8.6 7.4 23 14 9 30 44 36 26 17 45 19 28 27 16 13 11 10 10 11 14 16 16 16 17 17 16 16 15 13 14 18 21 1.2 .52 .31 2.7 2.1 1.4 .91 .53 1.3 .57 .72 .71 .43 .34 .27 .23 .24 .33 .30 .33 .34 .32 .32 .31 .30 .29 .29 .47 .33 .40 .42 18.61 669.5 439.66 327.3 19.23 e Estimated RIO GRANDE DE LOIZA BASIN 50053025 RIO TURABO ABOVE BORINQ0EN, PR--Continued SEDIMENT DISCHARGE, SUSPENDED {TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 203 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) JANUARY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL 10 9.2 12 13 16 10 8.5 7.8 9.9 18 12 11 14 28 12 11 10 10 9.0 9.0 8.4 7.5 7.5 7.4 7.2 8.5 7.2 7.1 6.6 6.6 7.8 322.2 22 19 14 12 18 11 8 7 10 46 23 11 48 41 13 11 10 9 7 6 6 7 9 10 11 12 12 12 15 23 29 —— .61 .50 .42 .48 1.3 .30 .18 .16 .33 2.5 .67 .31 2.2 4.1 .44 .34 .28 .25 .17 .14 .13 .14 .18 .20 .21 .28 .23 .22 .26 .41 .58 18.52 MEAN MEAN CONCBN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) FEBRUARY 7.3 7.9 8.0 8.2 8.1 7.6 7.5 7.0 6.5 6.7 7.0 6.5 6.4 12 8.5 6.8 6.6 6.9 8.7 131 19 14 78 30 16 13 11 11 —— —— 467.2 25 15 7 6 11 52 23 17 17 18 17 17 16 22 11 10 11 11 11 354 20 12 220 51 16 9 6 10 —— .46 .30 .16 .14 .24 1.1 .44 .31 .30 .33 .31 .27 .26 .90 .27 .18 .18 .19 .28 266 1.3 .45 126 5.2 .69 .30 .19 .27 —— 407.02 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) MARCH 38 23 15 12 11 10 9.8 9.5 9.5 11 8.9 29 12 10 9.1 8.9 8.7 8.4 8.0 7.9 7.7 7.5 7.5 7.5 7.1 8.5 7.7 7.4 8.2 8.8 7.7 345.3 84 35 10 11 11 11 11 13 13 10 8 53 13 10 10 10 48 32 20 20 20 21 21 21 15 10 9 11 12 13 13 —— 33 3.1 .38 .32 .31 .30 .30 .33 .34 .27 .20 11 .43 .25 .24 .24 1.1 .72 .42 .41 .40 .41 .42 .40 .28 .22 .19 .20 .25 .29 .26 56.98 204 RIO GRANDE DE LOIZA BASIN 50053025 RIO TDRABO ABOVE BORINQUBN, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) MAY MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 7.0 6.9 6.7 7.2 6.7 7.4 9.2 8.8 7.2 12 13 7.4 6.6 7.4 7.1 6.5 7.1 6.7 6.2 6.2 5.8 6.4 5.8 5.8 5.8 5.9 5.6 5.7 5.7 5.7 ___ APRIL 14 13 11 9 8 7 6 6 8 22 11 30 65 78 73 70 64 51 33 18 13 16 18 16 12 8 8 10 11 12 ___ .25 .23 .19 .16 .14 .15 .15 .15 .16 .87 .43 .54 1.2 1.5 1.4 1.2 1.1 .87 .54 .29 .20 .25 .28 .25 .19 .13 .12 .15 .17 .18 5.7 5.5 5.3 5.8 7.6 6.7 5.4 5.1 12 14 7.7 6.1 5.5 6.1 7.5 6.2 5.2 5.1 5.1 5.3 5.3 5.1 5.3 5.1 5.1 5.1 5.1 5.1 5.0 5.1 5.1 14 15 15 15 13 11 10 9 19 21 8 4 7 10 12 14 18 21 24 24 20 16 12 10 10 9 8 7 6 7 8 .20 .22 .22 .22 .26 .22 .14 .14 .82 .92 .19 .07 .11 .15 .24 .23 .25 .29 .32 .33 .28 .22 .17 .14 .14 .13 .12 .10 .08 .09 .11 MEAN DISCHARGE (CFS) 5.1 5.0 5.0 4.8 4.8 17 5.5 4.5 4.5 4.3 4.4 4.3 4.4 4.3 6.7 5.7 16 12 8.4 5.3 .3 .4 .5 .3 .3 97 10 11 9.4 7.7 MEAN CONCEN- TRATION (MG/L) JUNE 9 7 6 6 7 25 8 6 6 9 14 18 21 18 12 12 23 20 12 8 8 6 5 5 5 275 14 10 10 10 SEDIMENT DISCHARGE (TONS/DAY) .12 .10 .08 .08 .10 2.3 .14 .08 .07 .10 .16 .22 .24 .20 .20 .20 1.6 .85 .27 .13 .09 .07 .06 .06 .06 217 .43 .30 .26 .19 TOTAL 211.5 13.44 189.3 7.12 288.9 225.76 RIO GRANDB DE LOIZA BASIN 50053025 RIO TDRABO ABOVE BORINQUEN, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 205 DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CPS) (MG/L) (TONS/ DAY) 6.8 5.5 19 15 7.5 6.7 6.2 5.9 5.1 5.0 5.1 4.9 4.9 4.9 4.9 4.6 e5.4 86 ell 7.4 6.7 5.7 5.2 .6 .1 .1 .2 .2 .2 .2 .7 JULY 7 5 29 23 18 22 23 22 19 15 12 10 10 10 10 10 10 217 15 14 17 18 18 18 18 17 14 11 7 6 6 TOTAL 273.7 YEAR e 4412.7 Estimated MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CPS) (MG/L) (TONS/DAY) AUGUST .15 .08 3.2 1.1 .36 .37 .38 .33 .25 .20 .16 .13 .13 .14 .14 .13 e.14 196 e.52 .24 .29 .27 .23 .21 .19 .18 .16 .12 .08 .07 .08 206.03 2636.27 5.1 .2 .1 .5 .6 .3 .2 .2 .1 5.1 4.9 3.9 3.7 3.8 3.8 3.5 3.3 ell e8.6 3.7 3.6 4.3 3.9 36 43 7.6 5.4 4.6 5.1 4.3 4.1 216.5 7 7 6 7 5 5 4 2 2 2 2 3 4 6 9 10 6 14 11 10 11 11 11 95 104 10 10 10 10 9 9 ... .11 .08 .07 .09 .08 .06 .05 .03 .02 .02 .03 .02 .03 .06 .08 .08 .06 e.64 e.25 .09 .11 .13 .11 72 48 .20 .14 .12 .13 .10 .10 123.09 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CPS) (MG/L) (TONS/DAY) SEPTEMBER 4.1 6.2 5.4 4.3 4.3 e27 e!4 7.7 e6.8 e6.8 e36 11 7.3 6.0 e81 e64 e22 12 28 273 e34 19 el 6 e!8 e!6 e!2 ell 11 elO 9.0 9 6 5 5 5 40 17 6 5 6 68 13 12 12 205 145 34 13 61 649 62 25 20 7 13 11 5 5 5 5 .10 .10 .08 .06 .06 e4.7 e.96 .13 e.08 e.ll e!3 .41 .25 .21 e!40 e44 e2.9 .44 38 844 e6.7 1.4 el.O e.33 e.85 e.41 e.14 .14 e.13 .12 782.9 1100.81 206 RIO ORANDE DE LOIZA BASIN 50053025 RIO TURABO ABOVE BORINQUBN,PR—Continued WATER QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 SILT AND CLAY PERCENT OF SUSPENDED SEDIMENT DATE .TON 1994 28... SEP 20... STREAM- FLOW, INSTAN- TIME TANEOUS (CPS) 1300 11 1555 223 SEDI- MENT, SUS- PENDED (HG/L) 119 202 SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) 3. 122 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .062 MM .5 99 72 RIO GRANDE DE LOIZA BASIN 50055000 RIO GRANDE DE LOIZA AT CAGUAS, PR 207 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 mi 1 (232.6 km 1 ). HATER-DISCHARGE RECORDS PERIOD OP RECORD. —1959 (low-flow measurement only), February to November 1959 (monthly measurements only), December 1959 to current year. GAGE.--Hater-stage recorder. Datum of gage is 143.28 ft (43.672 m) above mean sea level. REMARKS.--Records fair. Gage-height and precipitation satellite telemetry at station. DISCHARGE, CUBIC FEET PER SECOND, HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY OCT NOV DEC JAN PEB MAR APR MAY JUN JUL AUG SEP 1 204 61 2 134 59 3 122 57 4 105 56 5 109 54 6 231 53 7 181 55 8 118 57 9 106 79 10 98 71 11 90 86 12 127 64 13 90 59 14 83 83 15 78 102 16 277 773 17 173 190 18 87 1020 19 77 621 20 73 748 21 73 756 22 67 265 23 91 169 24 74 172 25 61 149 26 162 308 27 73 192 28 95 138 29 91 119 30 65 280 31 60 TOTAL 3475 6896 MEAN 112 230 MAX 277 1020 MIN 60 53 AC-PT 6890 13680 CPSM 1.25 2.56 IN. 1.44 2.86 STATISTICS OP MONTHLY MEAN MEAN 370 313 MAX 1910 1131 (WY) 1971 1988 MIN 44.2 64.9 (WY) 1968 1968 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN- DAY MINIMUM INSTANTANEOUS PEAK PLOW INSTANTANEOUS PEAK STAGE INSTANTANEOUS LOW PLOW ANNUAL RUNOFF (AC-PT) ANNUAL RUNOFF (CPSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 143 129 113 121 142 129 106 99 89 94 85 83 85 82 78 77 74 87 84 76 79 75 74 72 74 69 67 94 79 81 70 2810 90.6 143 67 5570 1.01 1.16 DATA 228 714 1988 33.6 1968 FOR 70 89 81 73 104 90 71 65 66 115 84 92 101 204 102 92 83 83 77 70 73 70 64 61 62 65 60 62 60 60 67 2516 81.2 204 60 4990 .90 1.04 FOR HATER 147 559 1992 45.3 1968 60 60 60 63 64 63 54 52 50 49 50 50 48 51 87 52 50 52 85 1350 192 114 220 229 118 88 78 73 ___ ___ --- 3562 127 1350 48 7070 1.42 1.48 YEARS 1960 110 291 1984 35.6 1968 160 206 100 82 69 65 60 59 62 89 60 120 80 54 51 48 45 44 45 45 42 40 39 39 37 47 38 35 35 44 39 1979 63.8 206 35 3930 .71 .82 - 1994 89.0 306 1989 23.2 1968 1993 CALENDAR YEAR 70323 193 6490 32 34 139500 2. 29. 319 102 53 Jul 11 Apr 5 Apr 2 15 13 35 33 32 33 31 34 42 39 33 43 54 48 33 33 31 31 32 31 31 29 27 29 29 28 27 24 23 25 26 25 --- 971 32.4 54 23 1930 .36 .40 22 22 22 24 26 42 34 29 59 110 82 47 53 74 59 46 39 37 33 29 28 27 27 26 24 27 26 25 24 23 23 1169 37.7 110 22 2320 .42 .48 24 23 23 23 23 81 57 31 27 26 24 27 28 23 25 47 59 89 47 37 27 23 21 20 20 396 124 54 53 56 --- 1538 51.3 396 20 3050, .57 .64 52 36 33 77 40 33 32 32 28 24 22 21 20 19 18 19 19 705 147 53 39 33 29 26 25 23 22 22 22 23 23 1717 55.4 705 18 3410 .62 .71 38 29 24 21 25 28 22 29 24 32 51 35 25 24 21 19 18 27 90 38 26 22 22 62 592 73 43 38 42 29 25 1594 51.4 592 18 3160 .57 .66 22 37 57 31 27 120 150 56 51 58 110 95 49 39 353 287 233 92 92 4590 513 201 137 137 104 91 73 66 60 54 --- 7985 266 4590 22 15840 2.96 3.31 , BY WATER YEAR (WY) 83.0 226 1985 32.4 1994 FOR 1994 36212 99. 4590 18 20 24300 19. 17 71830 1. 15. 148 59 24 247 863 1985 33.7 1974 HATER YEAR 2 Sep 20 Jul IS Jul 11 Sep 20 30 Sep 20 Aug 18 10 00 255 1283 1979 34.1 1975 227 660 1961 21.8 1974 WATER 215 526 82 17900 11 11 71500 31 17 156100 2 32 357 104 39 251 949 1979 51.4 1994 YEARS 1960 .3 Oct Apr Apr Sep . 17 Sep Aug .40 .59 257 764 1979 37.4 1967 - 1994 1979 1967 9 1970 8 1968 8 1968 6 1960 6 1960 18 1994 208 RIO GRANDB DB LOIZA BASIN 50055000 RIO GRANDB DB 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 1994. INSTRUMENTATION.-- USD-49 and automatic sediment sampler. REMARKS.—Sediment samples collected by local observer on a weekly basis and during highflow events. EXTREMES FOR PERIOD OF DAILY RECORD.-- SEDIMENT CONCENTRATION: Maximum daily mean,14,500 mg/L Nov 27, 1987; Minimum daily mean, 8 mg/L January 23, 1992. SEDIMENT LOADS: Maximum daily mean, 227,000 tons (205,890 tonnes) Nov 27, 1987; Minimum daily mean, 0.85 tons (0.7 tonnes) August 4, 1993. EXTREMES FOR CURRENT YEAR.-- SEDIMENT CONCENTRATION: Maximum daily mean, 1,450 mg/L September 20, 1994 ; minimum daily mean, 15 mg/L January 23, 1992. SEDIMENT LOADS: Maximum daily mean, 29,800 tons (27,000 tonnes) Setember 20, 1994; minimum daily 0.85 ton (0.77 tonnes) August 4,1993. WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE OCT 1993 26. .. DEC 07. .. FEB 1994 17. .. APR 28. . . JUN 20. .. AUG 12. .. DATE OCT 1993 26. . . DEC 07. .. FEB 1994 17. .. APR 28. .. JUN 20. .. AUG 12. .. TIME 1340 1030 0820 1025 0830 0830 HARD- NESS TOTAL (MG/L AS CAC03) 47 -- -- 170 -- 61 DIS- CHARGE, INST. CUBIC FEET PER SECOND 152 37 50 28 38 36 CALCIUM DIS- SOLVED (MG/L AS CA) 12 -- -- 47 -- 16 SPE- CIFIC CON- DUCT- ANCE (US/CM) 165 575 255 291 232 225 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 4.2 -- -- 13 -- 5.2 PH WATER WHOLE FIELD (STAND- ARD UNITS) 7.0 7.6 7.2 7.3 7.2 7.0 SODIUM, DIS- SOLVED (MG/L AS MA) 12 -- -- 29 -- 22 TEMPER- ATURE WATER (DEG C) 28.5 26.0 24.5 28.0 28.5 30.0 SODIUM AD- SORP- TION RATIO 0.8 -- -- 1 -- 1 TUR- BID- ITY (NTU) 70 13 23 0.20 48 1.6 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 2.5 -- -- 6.5 -- 2.0 OXYGEN, DIS- SOLVED (MG/L) 5.9 4.0 5.6 3.4 1.4 4.4 ALKA- LINITY WAT WH TOT PET FIELD MG/L AS CACO3 49 120 80 80 72 79 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 76 49 66 43 18 57 SULFIDE TOTAL (MG/L AS S) 1.1 -- -- 1.7 -- -- OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 25 12 <10 <10 14 27 SULFATE DIS- SOLVED (MG/L AS SO4) 8.2 -- -- 18 -- 13 COLI- FORM, FECAL, 0.45 UM-MF (COLS./ 100 ML) 490 7300 1600 K1900 2600 4400 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 13 -- -- 36 -- 22 STREP- TOCOCCI FECAL, (COLS. PER 100 ML) 350 72000 760 410 K140 530 FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.20 -- -- 0.10 -- <0.10 K = non-ideal count RIO GRANDB DB LOIZA BASIN 50055000 RIO GRANDB DB LOIZA AT CAGUAS, PR—Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 209 DATE OCT 1993 26. .. DEC 07. .. FBB 1994 17. .. APR 28. .. JUN 20. .. AUO 12. .. SILICA, DIS- SOLVED (MG/L AS SI 02) SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) SOLIDS, DIS- SOLVED (TONS PER DAY) RESIDUE TOTAL AT 105 DBG. C, SUS- PENDED (MG/L) NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MO/L AS N) PHOS- PHORUS TOTAL (MG/L AS P) ARSENIC TOTAL (UG/L AS AS) BARIUM, TOTAL RECOV- ERABLE (UO/L AS BA) BORON, TOTAL RECOV- ERABLE (UG/L AS B) CADMIUM TOTAL RECOV- ERABLE (UO/L AS CD) CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) 26 32 28 107 44.1 230 17.4 156 15.3 110 0.80 0.270 10 0.40 0.210 10 49 0.30 0.200 29 0.50 0.160 100 <100 20 50 DATE OCT 1993 26. . . DEC 07. .. FBB 1994 17. .. APR 28... JUN 20... AUG 12... COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) IRON, TOTAL RECOV- ERABLE (UO/L AS FB) LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) MERCURY TOTAL RECOV- ERABLE (UO/L AS HG) SELE- NIUM, TOTAL (UO/L AS SB) SILVER, TOTAL RECOV- ERABLE (UG/L AS AO) ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) CYANIDE TOTAL (MO/L AS CN) PHENOLS TOTAL (UG/L) METHY- LENB BLUB ACTIVE SUB- STANCE (MG/L) 20 4300 200 320 50 <0.10 0.10 30 <0.010 D20 30 <0.010 <0.02 0.03 270 RIO GRANDB DB LOIZA BASIN 50055000 RIO GRANDB DB LOIZA AT CAGUAS, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), NATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CPS) (MG/L) (TONS/DAY) (CPS) (MO/L) (TONS/DAY) (CPS) (MG/L) (TONS/DAY) OCTOBER 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 204 134 122 105 109 231 181 118 106 98 90 127 90 83 78 277 173 87 77 73 73 67 91 74 61 162 73 95 91 65 60 161 44 208 93 96 192 149 72 32 35 48 109 81 76 71 209 144 79 70 67 68 62 81 67 57 139 90 88 85 50 41 104 16 71 27 28 156 79 24 9.1 9.2 12 40 20 17 15 343 85 19 14 13 14 11 21 14 9.3 77 18 30 22 8.9 6.6 NOVEMBER 61 59 57 56 54 53 55 57 79 71 86 64 59 83 102 773 190 1020 621 748 756 265 169 172 149 308 192 138 119 280 ___ 38 33 40 66 106 114 88 62 61 35 78 54 31 68 90 1190 303 638 446 552 555 209 96 136 127 227 231 132 104 224 6.2 5.4 6.0 9.4 15 16 13 9.4 14 7.0 19 9.6 4.9 17 25 3290 171 3030 879 1650 1810 155 46 64 52 185 124 51 34 239 DECEMBER 143 129 113 121 142 129 106 99 89 94 85 83 85 82 78 77 74 87 84 76 79 75 74 72 74 69 67 94 79 81 70 77 38 45 78 119 111 70 33 31 33 31 29 25 21 19 18 18 17 29 44 58 67 59 36 20 16 15 65 30 15 16 35 12 14 28 46 40 20 8.8 7.4 8.0 7.4 6.5 5.5 4.6 4.0 3.8 3.6 4.0 6.7 9.0 12 14 12 7.0 3.9 3.0 2.8 19 6.7 3.3 4.7 TOTAL 3475 1333.1 6896 11956.9 2810 362.7 RIO GRANDE DE LOIZA BASIN 21 1 50055000 RIO GRANDE DE LOIZA AT CAGUAS, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) JANUARY 1 2 3 4 5 6 7 e 9 10 11 12 13 14 15 16 17 10 19 20 21 22 23 24 25 26 27 28 29 30 31 70 89 81 73 104 90 71 65 66 115 84 92 101 204 102 92 83 83 77 70 73 70 €4 61 62 65 60 62 60 60 67 17 19 21 24 67 110 145 171 146 109 71 48 91 162 44 23 20 20 18 22 53 104 126 135 144 151 152 154 143 124 73 3.1 4.6 4.6 4.7 21 27 28 30 27 33 16 12 27 96 13 5.6 4.5 4.4 3.6 4.1 10 19 22 23 23 26 24 25 23 20 13 FEBRUARY 60 60 60 63 64 63 54 52 50 49 50 50 48 51 87 52 50 52 05 1350 192 —— 84 78 73 58 77 122 188 190 134 84 63 58 58 58 52 46 49 119 76 49 49 73 911 156 68 172 172 44 44 60 67 ___ ___ 9 12 19 32 31 21 13 8 7 7 7 6 5 6 28 11 6 6 21 5420 97 21 177 139 14 10 12 14 - - - .4 .8 .7 .5 .7 .9 .9 .9 .6 .8 -- -- -- MARCH 160 206 100 82 69 65 60 59 62 89 60 120 80 54 51 48 45 44 45 45 42 40 39 39 37 47 38 35 35 44 39 131 198 156 175 100 132 96 60 58 86 09 109 72 51 47 46 54 73 91 101 105 112 126 141 143 130 132 123 108 95 80 87 145 42 39 34 23 16 11 9. 23 15 48 16 7. 6. 6. 6. 8. 11 12 12 12 13 14 14 18 13 11 10 11 9. 6 5 4 0 4 6 3 TOTAL 2516 597.2 6166.2 1979 703.8 2 12 RIO GRANDE DE LOIZA BASIN 50055000 RIO GRANDE DE LOIZA AT CAG0AS, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 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) (MQ/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) 1 2 3 4 5 S 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 35 33 32 33 31 34 42 39 33 43 54 48 33 33 31 31 32 31 31 29 27 29 29 28 27 24 23 25 26 25 APRIL 82 435 71 70 70 69 74 84 94 99 104 618 108 115 131 134 98 60 35 30 29 30 26 28 27 25 23 25 27 25 —— MAY 7.5 40 6.2 6.2 5.9 6.4 8.3 8.8 8.1 11 15 83 9.7 10 11 11 8.0 5.1 2.8 2.2 2.1 2.4 2.0 2.0 1.8 1.6 1.4 1.6 1.6 1.6 —— 22 22 22 24 26 42 34 29 59 110 82 47 53 74 59 46 39 37 33 29 28 27 27 26 24 27 26 25 24 23 23 23 23 23 24 27 40 34 30 55 97 74 46 50 67 56 45 39 37 32 29 28 28 28 27 27 27 26 26 26 25 25 1.3 1.3 1.3 1.4 1.8 4.5 3.1 2.3 10 31 19 6.0 7.4 13 9.2 5.7 4.0 3.6 2.7 2.2 2.0 2.0 2.0 1.8 1.8 1.8 1.8 1.7 1.6 1.6 1.5 •TONE 24 23 23 23 23 81 57 31 27 26 24 27 28 23 25 47 59 89 47 37 27 23 21 20 20 396 124 54 53 56 27 25 24 24 25 75 55 32 40 66 86 85 76 70 60 47 56 89 45 37 33 34 29 22 40 654 115 78 72 64 1.8 1.5 1.4 1.4 1.5 20 9.4 2.7 2.9 4.6 5.8 6.1 5.5 4.4 4.2 5.9 9.6 23 5.9 3.7 2.4 2.2 1.6 1.1 2.1 1330 47 12 10 9.9 TOTAL 971 284.5 1169 150.4 1538 1539.6 RIO GRANDE DE LOIZA BASIN 50055000 RIO GRANDE DE LOIZA AT CAGUAS, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 213 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEH- SEDIMENT DISCHARGE THAT ION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/ DAY) 1 2 3 4 5 6 7 e 9 10 11 12 13 14 15 16 17 16 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL 52 36 33 77 40 33 32 32 28 24 22 21 20 19 18 19 19 705 147 53 39 33 29 26 25 23 22 22 22 23 23 1717 JULY 56 44 33 72 46 34 29 3t> 32 36 39 41 42 38 32 25 20 1010 389 330 251 155 66 41 38 33 31 30 31 31 30 AUGUST 8.0 4.4 2.9 17 5.1 3.0 2.5 2.6 2.4 2.3 2.3 2.3 2.2 1.9 1.6 1.3 1.0 6400 162 48 26 14 5.2 2.9 2.5 2.0 1.8 1.8 1.8 1.9 1.9 6734.6 38 29 24 21 25 28 22 29 24 32 51 35 25 24 21 19 18 27 90 38 26 22 22 62 592 73 43 38 42 29 25 1594 38 31 20 15 15 16 18 18 19 19 22 28 31 32 32 32 30 32 80 43 29 24 24 58 396 70 35 25 42 28 22 3.9 2.5 1.3 .85 1.0 1.2 1.1 1.4 1.3 1.7 3.0 2.6 2.1 2.1 1.9 1.7 1.4 3.1 21 4.6 2.0 1.4 1.4 23 1060 15 4.1 2.7 5.0 2.1 1.4 1177.85 SEPTEMBER 22 37 57 31 27 120 150 56 51 58 110 95 49 39 353 287 233 92 92 4590 513 201 137 137 104 91 73 66 60 54 7985 24 38 62 41 28 102 126 54 49 59 94 86 42 34 314 279 186 84 82 1450 110 29 26 23 28 31 37 44 55 50 ___ 1.4 4.7 9.5 3.5 2.0 48 56 8.6 7.1 9.7 39 24 5.7 3.5 607 281 142 21 42 29800 205 16 9.6 8.7 7.8 7.7 7.3 7.5 8.9 7.1 31401.3 2 14 RIO GRANDE DE LOIZA BASIN 50055000 RIO ORANOE DE LOIZA AT CAGUAS, PR--Continued WATER QOALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 PARTIOLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT DATE NOV 1993 16... JUL 1994 18... ADO 25... SEP 07... 20... 20... TIME 1010 1053 0238 1810 1116 1326 DIS- CHARGE, INST. CUBIC FEET PER SECOND 1650 155 1083 104 21700 7990 SEDI- MENT, SUS- PENDED (MO/L) 3890 4340 2160 803 5020 2730 SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) 17340 1820 6300 225 294000 58900 SED. SOSP. FALL DIAM. PERCENT FINER THAN .002 MM 57 40 49 85 30 35 SED. SUSP. FALL DIAM. PERCENT FINER THAN .004 MM 64 49 56 89 36 41 SED. SOSP. FALL DIAM. PERCENT FINER THAN .008 MM 72 59 67 92 46 52 DATE NOV 1993 16... JUL 1994 18... AOG 25... SEP 07... 20... 20... SED. SOSP. FALL DIAM. PERCENT FINER THAN .016 MM 83 80 80 93 58 65 SED. SUSP. FALL DIAM. PERCENT FINER THAN .031 MM 91 86 87 — 70 75 SED. SOSP. SIEVE DIAM. PERCENT FINER THAN .062 MM 99 89 99 98 84 90 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .125 MM 99.8 97 99.6 98.4 95 97.9 SED. SOSP. SIEVE DIAM. PERCENT FINER THAN .250 MM 99.9 99 99.7 98.4 95.7 99.6 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .500 MM 100 99.6 99.7 98.4 99.5 99.9 SED. SOSP. SIEVE DIAM. PERCENT FINER THAN 1.00 MM 100 99.8 100 100 99.7 100 RIO GRANDE DB LOIZA BASIN 50055000 RIO GRANDE DB LOIZA AT CACRJAS—Continued HATER QUALITY DATA, HATER YEAR OCTOBER 1993 TO SBPTEMBER 1994 SILT AND CLAY PERCENT OF SUSPENDED SEDIMENT 215 DATE OCT 1993 06.. . 20... NOV 16... 18.. . 20.. . MAR 1994 11.. . JUN 18... JUL 18... 18... 20... AUG 25... SEP 16... 17... 20... 20... TIME 1648 1143 1008 1648 1642 1825 0930 1223 1428 1900 0031 1317 1100 0424 1051 STREAM- FLOW, INSTAN- TANEOUS (CFS) 260 74 1670 3150 647 57 120 3460 1910 40 1540 163 211 1960 22600 SEDI- MENT, SUS- PENDED (MG/L) 260 176 3570 1140 288 1100 333 4470 1900 322 614 1980 159 1620 2740 SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) 183 35 16100 9700 503 169 108 41760 9800 35 2550 871 90 8570 167000 SED. SUSP. SIEVE DIAH. PERCENT FINER THAN .062 MM 99 97 99 99 98 99 99 98 99 98 83 96 99 99 88 216 RIO GRANDS DE LOIZA BASIN 50055100 RIO CAGUITAS NEAR AQUAS BOENAS, PR LOCATION.--Lat 18°14'48", long 66°05'37", Hydrologic Unit 21010005, on right bank 450 ft (137 m) upstream from bridge on Highway 777, 1.0 mi (1.6 km) southeast from Aguas Buenas, 3.9 mi (6.3 km) northwest from Caguas, and 2.1 mi (3.4 km) southwest from Las Carolines. DRAINAGE AREA.--5.30 mi 2 (13.72 km2 ; WATER-DISCHARGE RECORDS PERIOD OP RECORD.--February 1990 to current year. GAGE.—Water-stage recorder and crest-stage gage. Elevation of gage is 394 ft (120 m), from topographic map. REMARKS.--Records fair. Gage-height and precipitation satellite telemetry at station. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 7.9 5.9 2 15 5.7 3 23 5.7 4 12 5.7 5 8.8 5.5 6 8.2 5.4 7 11 5.5 8 8.4 6.2 9 7.7 6.0 10 7.3 5.7 11 7.2 5.6 12 7.2 5.5 13 7.1 5.4 14 7.1 6.5 15 7.2 8.4 16 23 54 17 8.7 15 18 6.9 55 19 6.4 25 20 6.4 19 21 6.3 17 22 6.3 9.0 23 6.5 7.6 24 6.2 7.4 25 6.0 7.2 26 6.0 7.6 27 6.0 7.1 28 6.0 6.7 29 5.9 6.7 30 5.8 6.7 31 5.8 TOTAL 263.3 339.7 MEAN 8.49 11.3 MAX 23 55 MIN 5.8 5.4 AC-FT 522 674 CFSM 1.60 2.14 IN. 1.85 2.38 STATISTICS OP MONTHLY MEAN MEAN 10.4 9.20 MAX 20.9 12 . 3 (WY) 1991 1993 MIN 5.30 5.76 (WY) 1992 1991 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN- DAY MINIMUM INSTANTANEOUS PEAK PLOW INSTANTANEOUS PEAK STAGE INSTANTANEOUS LOW FLOW ANNUAL RUNOFF (AC-FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 6.4 6.4 6.2 6.4 6.2 6.0 6.0 6.0 5.9 5.9 5.7 5.7 5.5 5.5 5.5 5.5 5.5 5.9 5.6 5.5 5.5 5.5 5.5 5.5 5.4 5.3 5.7 5.9 5.5 5.5 5.5 178.1 5.75 6.4 5.3 353 1.08 1.25 DATA 8.51 13.4 1993 5.59 1992 FOR 5.5 5.6 5.5 5.3 5.7 5.6 5.6 5.7 5.6 5.6 8.0 6.5 5.9 6.0 5.7 5.7 7.1 6.3 6.1 7.2 6.2 5.7 5.7 5.5 5.3 5.2 5.1 6.3 5.8 5.5 5.3 181.8 5.86 8.0 5.1 361 1.11 1.28 5.6 5.3 5.2 5.3 5.2 5.2 5.0 5.0 4.9 4.9 4.9 4.9 5.2 5.3 5.3 5.2 5.2 5.2 5.2 5.3 5.3 5.2 5.5 5.9 6.0 5.2 5.5 5.3 ___ ___ --- 147.2 5.26 6.0 4.9 292 .99 1.03 FOR WATER YEARS 1990 9.73 16.7 1992 5.86 1994 5.43 8.00 1991 3.51 1990 7.7 6.2 5.1 4.8 4.7 4.7 4.6 4.6 4.6 4.9 4.6 4.6 4.5 4.4 4.4 4.4 4.4 4.4 4.4 4.4 4.4 4.4 4.3 4.3 4.3 4.3 4.3 4.3 4.5 4.7 4.7 144.9 4.67 7.7 4.3 287 .88 1.02 - 1994 5.74 8.87 1990 3.60 1992 1993 CALENDAR YEAR 3849. 10. 146 4. 4. 7630 1. 27. 15 7. 5. 2 5 Jul 11 4 Apr 1 4 Apr 1 99 02 2 4 4.8 4.7 4.8 4.8 5.1 5.2 4.9 4.8 4.7 5.3 7.2 6.5 5.0 5.8 6.9 5.6 5.3 5.1 4.8 4.6 4.5 4.4 4.3 4.1 4.1 4.0 5.6 4.6 4.0 3.7 --- 149.2 4.97 7.2 3.7 296 .94 1.05 3.6 3.6 3.5 3.4 3.4 3.5 3.3 3.1 3.1 4.1 3.4 3.2 3.1 3.1 3.1 3.0 2.9 3.0 3.7 2.9 2.7 2.7 2.7 2.7 2.5 2.6 2.6 2.7 2.6 2.5 2.6 94.9 3.06 4.1 2.5 188 .58 .67 2.6 2.4 2.4 2.4 2.4 3.2 2.6 2.5 2.3 2.3 2.4 2.4 2.2 2.2 2.2 2.4 3.0 2.5 2.3 2.1 2.0 2.0 1.9 1.9 1.9 2.7 2.1 2.0 2.0 2.3 69.6 2.32 3.2 1.9 138 .44 .49 2.1 1.9 1.9 1.8 1.8 2.0 1.8 1.8 1.7 1.7 1.8 1.7 1.7 1.7 1.7 1.7 1.7 4.6 2.1 2.0 1.9 1.8 1.8 1.7 1.7 1.7 1.6 1.6 1.6 1.6 1.6 57.8 1.86 4.6 1.6 115 .35 .41 1.7 1.6 1.5 1.5 1.5 1.5 1.5 1.5 1.6 1.9 1.9 1.7 1.6 1.7 1.7 1.6 1.6 1.9 1.9 1.8 1.7 1.6 1.6 3.5 2.8 2.0 2.0 2.3 2.3 2.2 2.2 57.4 1.85 3.5 1.5 114 .35 .40 2.3 2.4 2.5 2.5 2.6 5.2 3.6 2.9 2.8 3.0 4.4 3.3 3.0 2.8 3.1 3.2 2.9 3.3 3.1 7.2 4.7 3.6 3.4 3.5 3.1 3.1 3.0 2.9 2.9 3.4 --- 99.7 3.32 7.2 2.3 198 .63 .70 , BY WATER YEAR (WY) 6.12 13.1 1993 3.19 1992 FOR 1994 1783. 4. 55 1. 1. 392 12. 1. 3540 . 12. 7. 4. 1. 6.94 18.0 1993 2.48 1990 WATER YEAR 6 89 Nov 18 5 Aug 3 5 Aug 2 Nov 16 13 Nov 16 5 Aug 3 92 52 0 7 8 4.35 8.05 1993 2.32 1994 7.10 18.6 1993 1.86 1994 WATER 7. 11. 4. 235 1. 1. 2290 18. 1. 5370 1. 19. 10 5. 2. 6.01 11.2 1993 1.85 1994 YEARS 1990 - 41 1 89 Jan 5 5 Aug 3 5 Aug 2 Sep 18 28 Sep 18 5 Aug 3 40 01 0 7 6.45 11.3 1993 3.32 1994 1994 1993 1994 1992 1994 1994 1993 1993 1994 RIO GRANDE DE LOIZA BASIN 50055100 RIO CAGUITAS NEAR AGDAS BUENAS , PR—Continued WATER-QUALITY RECORDS PERIOD OF RECORD.— Water yearn 1990 to current year. PERIOD OF DAILY RECORD.-- SUSPENDED-SEDIMENT DISCHARGE] February 1990 to September 1994 INSTRUMENTATION.— DH-48 and automatic sediment sampler. REMARKS.-- Sediment samples were collected by a local observer on a weekly basis and during high flow events. EXTREMES FOR PERIOD OF DAILY RECORD.— SEDIMENT CONCENTRATION! Maximum daily mean, 1,690 mg/L Jul. 11, 1993; Minimum daily mean, 2 mg/L Several days. SEDIMENT LOADS! Maximum daily mean, 3,730 tons (3,360 tonnes) Jan. 05, 1992; Minimum daily mean, 0.02 ton (0.03 tonne) Several days. 277 EXTREMES FOR WATER YEAR 1994.— SEDIMENT CONCENTRATION: Maximum daily 2 mg/L Several days. an, 691 mg/L Nov. 18, 1993; Minimum daily mean. SEDIMENT LOADS: Maximum daily mean, 242 tons (220 tonnes) Nov. 18, 1993; Minimum daily mean, 0.02 ton (0.03 tonne) Several days. SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE I (CVS) (MG/L) (TONS/DAY) OCTOBER 7.9 15 23 12 8.8 8.2 11 8.4 7.7 7.3 7.2 7.2 7.1 7.1 7.2 23 8.7 6.9 6.4 6.4 6.3 6.3 6.5 6.2 6.0 6.0 6.0 6.0 5.9 5.8 5.8 35 138 268 142 135 133 125 33 20 18 13 8 6 5 5 236 50 15 10 10 8 7 5 5 7 10 11 11 11 12 15 .73 16 44 5.0 3.2 2.9 4.6 .78 .41 .35 .25 .17 .12 .10 .10 57 1.4 .28 .18 .17 .15 .12 .09 .08 .12 .16 .17 .18 .18 .18 .24 MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) NOVEMBER 5.9 5.7 5.7 5.7 5.5 5.4 5.5 6.2 6.0 5.7 5.6 5.5 5.4 6.5 8.4 54 15 55 25 19 17 9.0 7.6 7.4 7.2 7.6 7.1 6.7 6.7 6.7 19 20 19 12 6 4 4 12 24 18 18 18 21 92 52 608 98 691 260 155 305 215 190 189 188 150 89 21 7 5 .30 .30 .28 .18 .09 .07 .06 .29 .42 .27 .27 .26 .31 1.5 1.3 231 4.9 242 34 10 17 5.2 4.1 3.8 3.6 3.1 1.7 .38 .12 .09 DECEMBER 6.4 6.4 6.2 6.4 6.2 6.0 6.0 6.0 5.9 5.9 5.7 5.7 5.5 5.5 5.5 5.5 5.5 5.9 5.6 5.5 5.5 5.5 5.5 5.5 5.4 5.3 5.7 5.9 5.5 5.5 5.5 5 6 8 10 13 17 20 21 16 11 10 8 6 5 5 5 5 5 5 5 5 5 7 15 24 28 24 15 8 8 13 .09 .10 .14 .18 .22 .27 .32 .33 .26 .18 .15 .13 .10 .08 .08 .08 .08 .08 .08 .08 .08 .08 .11 .22 .35 .40 .36 .23 .11 .11 .18 TOTAL 263.3 139.41 339.7 566.89 178.1 5.26 2 18 RIO ORAKDE DE LOIZA BASIN 50055100 RIO CAGUITAS NEAR AQUAS BUBNAS , PR--Continu«d SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) FEBRUARY MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) JANUARY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 5.5 5.6 5.5 5.3 5.7 5.6 5.6 5.7 5.6 5.6 8.0 6.5 5.9 6.0 5.7 5.7 7.1 6.3 6.1 7.2 6.2 5.7 5.7 5.5 5.3 5.2 5.1 6.3 5.8 5.5 5.3 15 13 16 18 10 8 5 4 5 6 37 18 12 15 15 15 33 13 4 21 6 5 7 11 12 11 11 18 5 5 5 .22 .19 .22 .25 .14 .11 .07 .07 .09 .10 1.3 .35 .20 .24 .24 .24 .83 .24 .07 .57 .12 .08 .11 .16 .17 .16 .15 .40 .08 .08 .08 5.6 5.3 5.2 5.3 5.2 5.2 5.0 5.0 4.9 4.9 4.9 4.9 5.2 5.3 5.3 5.2 5.2 5.2 5.2 5.3 5.3 5.2 5.5 5.9 6.0 5.2 5.5 5.3 5 5 5 4 4 3 2 3 4 4 5 5 5 5 5 5 5 59 105 137 154 155 148 139 130 124 116 74 .08 .08 .08 .06 .06 .04 .03 .05 .06 .06 .06 .07 .08 .08 .08 .08 .08 .82 1.5 1.9 2.2 2.2 2.2 2.3 2.1 1.8 1.8 1.1 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) MARCH 7.7 6.2 5.1 .8 .7 .7 .6 .6 .6 .9 .6 .6 .5 . ^ . . . • . .3 .3 .3 .3 .3 .3 .5 .7 .7 40 26 12 14 15 17 18 69 35 10 8 7 5 5 6 8 10 10 10 10 8 6 5 3 3 46 95 86 79 75 77 1.0 .48 .17 .18 .20 .21 .22 .85 .43 .12 .11 .09 .07 .06 .08 .10 .11 .12 .12 .12 .10 .07 .05 .04 .04 .53 1.1 1.0 .96 .96 .97 TOTAL 181.8 7.33 147.2 21.05 144.9 10.66 RIO GRANDE DB LOIZA BASIN 2 19 50055100 RIO CAGOITAS NEAR AQUAS BOEKAS , PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), HATER TEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCBN- 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) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 4.8 4.7 4.8 4.8 5.1 5.2 4.9 4.8 4.7 5.3 7.2 6.5 5.0 5.8 6.9 5.6 5.3 5.1 4.8 4.6 4.5 4.4 4.3 4.1 4.1 4.0 5.6 4.6 4.0 3.7 APRIL 78 79 84 79 45 20 17 13 10 20 41 24 14 9 27 24 40 38 13 9 8 6 6 10 16 25 35 17 7 5 ___ MAY .98 1.0 1.1 1.0 .60 .27 .22 .16 .13 .32 1.2 .41 .19 .13 .89 .38 .56 .52 .16 .11 .10 .07 .06 .11 .18 .27 .64 .24 .07 .05 ___ 3.6 3.6 3.5 3.4 3.4 3.5 3.3 3.1 3.1 4.1 3.4 3.2 3.1 3.1 3.1 3.0 2.9 3.0 3.7 2.9 2.7 2.7 2.7 2.7 2.5 2.6 2.6 2.7 2.6 2.5 2.6 6 7 9 10 10 11 12 12 12 14 7 7 8 8 9 10 10 10 14 9 10 13 17 17 13 8 6 5 5 5 6 .06 .07 .09 .10 .10 .10 .10 .10 .10 .18 .07 .06 .06 .06 .07 .08 .08 .08 .15 .07 .07 .09 .12 .12 .08 .05 .04 .04 .04 .04 .05 JUNE 2.6 2.4 2.4 2.4 2.4 3.2 2.6 2.5 2.3 2.3 2.4 2.4 2.2 2.2 2.2 2.4 3.0 2.5 2.3 2.1 2.0 2.0 1.9 1.9 1.9 2.7 2.1 2.0 2.0 2.3 7 6 6 6 8 11 14 13 10 7 6 5 5 4 3 2 2 4 5 5 5 4 4 8 10 10 10 11 15 21 ___ .05 .04 .04 .04 .06 .09 .10 .09 .07 .05 .04 .04 .04 .03 .02 .02 .02 .04 .03 .02 .02 .02 .03 .05 .06 .07 .06 .06 .08 .13 ___ TOTAL 149.2 12.12 94.9 2.52 69.6 1.51 220 RIO GRANDE DE LOIZA BASIN 50055100 RIO CAGUITAS NEAR AGUAS BUENAS , PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEIT- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CPS) (MG/L) (TONS/DAY) (CPS) (MG/L) (TONS/DAY) (CPS) (MG/L) (TONS/DAY) 1 2 3 4 5 6 7 e 9 10 11 12 13 14 15 16 17 16 19 20 21 22 23 24 25 26 27 26 29 30 31 TOTAL YEAR 2.1 1.9 1.9 1.6 1.6 2.0 1.6 1.6 1.7 1.7 1.6 1.7 1.7 1.7 1.7 1.7 1.7 4.6 2.1 2.0 1.9 1.6 1.6 1.7 1.7 1.7 1.6 1.6 1.6 1.6 1.6 57.6 1763.6 JULY 22 21 16 15 17 23 24 20 15 10 6 6 7 14 23 30 31 204 20 16 11 9 7 7 6 6 6 6 6 7 6 —— AUGUST .13 .11 .09 .07 .06 .11 .12 .10 .07 .05 .04 .03 .03 .06 .10 .13 .15 7.6 .12 .06 .06 .05 .04 .04 .04 .04 .04 .04 .04 .03 .02 9.71 762.47 1.7 1.6 1.5 1.5 1.5 1.5 1.5 1.5 1.6 1.9 1.9 1.7 1.6 1.7 1.7 1.6 1.6 1.9 1.9 1.6 1.7 1.6 1.6 3.5 2.6 2.0 2.0 2.3 2.3 2.2 2.2 57.4 6 6 12 15 14 11 10 10 10 10 11 15 19 19 16 12 6 5 5 4 4 4 4 15 9 6 6 6 6 5 4 —— .02 .03 .05 .06 .05 .04 .04 .04 .04 .05 .06 .07 .06 .06 .07 .05 .03 .02 .02 .02 .02 .02 .02 .31 .06 .04 .04 .04 .04 .03 .02 1.56 SEPTEMBER 2.3 2.4 2.5 2.5 2.6 5.2 3.6 2.9 2.6 3.0 4.4 3.3 3.0 2.6 3.1 3.2 2.9 3.3 3.1 7.2 4.7 3.6 3.4 3.5 3.1 3.1 3.0 2.9 2.9 3.4 —— 99.7 3 3 4 5 5 23 11 10 10 10 10 10 10 10 10 10 10 11 6 55 16 12 12 12 12 12 12 11 9 10 —— —— .02 .02 .03 .04 .04 .50 .11 .06 .06 .09 .13 .09 .06 .06 .09 .09 .06 .10 .07 1.5 .24 .12 .11 .11 .10 .10 .09 .06 .07 .09 —— 4.43 RIO GRANDE DE LOIZA BASIN 50055100 RIO CAGUITAS NEAR AGOAS BUENAS, PR--Continued WATER QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 SILT AND CLAY PERCENT OF SUSPENDED SEDIMENT 221 DATE NOV 1993 14.. . JUL 1994 16... 16.. . SEP 17... TIME 1415 0920 1005 1357 STREAM- FLOW, INSTAN- TANEOUS (CFS) 6.0 16 6.0 SEDI- MENT, SUS- PENDED (MO/L) 134 1560 316 SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) 2.2 67 7.5 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .062 MM 94 65 97 2.6 375 2.6 92 222 RIO GRANDE DE LOIZA BASIN 50055170 RIO CAGUITAS NEAR CAGUAS, PR LOCATION.--Lat 18°13'59", long 66°02'53 M , Hydrologic Unit 21010005, on left bank, 0.9 mi (1.4 km) southwest from Plaza de Caguas, 0.6 mi (1.0 km) northeast from Escuela Bunker, and 1.2 mi (1.9 km) northwest from Escuela Antonio S. Pedreira. DRAINAGE AREA.--8.27 mi 1 (21.42 km1 ) . WATER-DISCHARGE RECORDS PERIOD OP RECORD.--May 1992 to current year. GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 216 ft (66 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. Gage-height and precipitation satellite telemetry at station. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES NOV DEC JAN FEB MAR APR MAY JON JUL AUG SEP 1 8.8 7.5 2 33 7.3 3 66 7.1 4 27 7.1 5 15 6.9 6 14 6.9 7 23 6.7 8 14 10 9 12 9.6 10 11 7.4 11 10 7.9 12 11 6.9 13 9.9 6.5 14 8.9 12 15 9.2 18 16 68 187 17 24 34 18 13 161 19 ell 69 20 e9.6 45 21 e9.0 37 22 e9.0 17 23 ell 13 24 elO 11 25 e9.0 11 26 e9.0 13 27 e9.0 10 28 8.7 9.8 29 7.8 9.2 30 7.6 9.2 31 7.0 --- TOTAL 495.5 764.0 MEAN 16,0 25.5 MAX 68 187 MIN 7.0 6.5 AC-FT 983 1520 CFSM 1.93 3.08 IN. 2.23 3.44 STATISTICS OF MONTHLY MEAN MEAN 14.8 31.4 MAX 16.0 37.4 (WY) 1994 1993 MIN 13.5 25.5 (WY) 1993 1994 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN -DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAQg ANNUAL RUNOFF (AC-FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 8.7 8.5 8.6 8.5 9.4 8.6 8.6 8.4 8.6 8.5 7.9 7.9 7.9 7.9 7.8 7.6 7.6 9.2 8.3 7.3 7.3 7.3 7.3 7.3 7.2 6.9 6.9 7.2 7.3 7.2 7.0 244.7 7.89 9.4 6.9 485 .95 1.10 DATA 22.4 37.0 1993 7.89 1994 FOR 7.0 7.3 7.6 7.3 7.7 7.5 8.0 8.0 7.6 7.6 14 12 8.3 8.0 6.7 6.6 7.4 7.9 6.8 9.7 8.9 7.5 7.0 7.0 6.9 6.6 6.6 7.3 8.3 7.0 6.9 243.0 7.84 14 6.6 482 .95 1.09 7.4 19 e3.3 7.0 12 e3 . 3 7.2 7.3 e3.4 7.7 6.4 e3 . 4 7.2 5.8 e4.0 6.9 5.4 e4.2 6.7 5.3 e4.0 6.8 5.0 e3.8 6.7 5.1 e3.9 6.7 6.5 e7.3 6.6 5.1 e6.6 6.4 6.4 6.7 7.0 6.4 6.1 5.8 6.8 7.0 6.4 6.4 7.5 7.3 6.8 6.7 6.9 7.7 .7 e6.9 .7 4.4 .3 4.3 .2 4.8 .0 5.9 .3 4.3 .0 4.1 .0 3.9 .0 3.6 .0 3.5 .0 3.2 .2 3.1 .6 3.1 .4 3.0 .2 2.9 .0 3.4 .0 5.3 --- 3.9 3.7 --- e3.9 3.4 --- e3.6 --- 191.2 165.9 124.0 6.83 5 7.7 35 4.13 19 7.3 5.8 3.6 2.9 379 329 246 .83 .86 65 .50 75 .56 FOR WATER YEARS 1992 - 1994, BY WATER 13.9 20.0 1993 7.84 1994 8.01 5 9.20 6 81 16.0 26 27.8 1993 1993 1993 6.83 5 35 4.13 1994 1994 1994 1993 CALENDAR YEAR 7770.4 21.3 447 5.4 5.7 15410 2,57 34.95 35 12 6.7 Jul 11 Mar 12 Mar 28 3.1 3.0 3.1 2.9 2.7 3.2 3.2 2.8 2.6 2.7 3.9 3.0 2.6 2.3 2.1 2.1 2.2 1.8 2.0 1.7 1.4 1.3 1.2 1.6 1.9 2.5 1.7 2.1 1.4 2.2 1.2 71.5 2.31 3.9 1.2 142 .28 .32 YEAR (WY) 21.7 41.2 1993 2.31 1994 1.0 .83 .89 .85 e.84 e3,8 .90 .76 .84 .76 .98 .76 .84 .84 .76 el.l el. 8 el. 6 el. 3 el.l el. 9 el. 8 1.7 1.4 1.4 8.1 3.5 2.3 1.8 4.8 --- 51.25 1.71 8.1 .76 102 .21 .23 7.95 14.9 1993 1.71 1994 FOR 1994 WATER YEAR 3038.65 8.33 187 .76 .83 1270 23.63 6030 1.01 13.67 12 6.4 1.7 Nov 16 Jun 8 Jun 8 Nov 16 Nov 16 2.9 2.1 1.8 1.6 1.5 2.4 2.3 1.7 1.7 1.5 1.5 1.4 1.3 1.3 1.3 1.4 1.4 34 13 6.4 .7 .0 .5 .7 .9 .8 .5 .2 3.5 3.4 3.4 128,1 4.13 34 1.3 254 .50 .58 18.7 45.5 1993 4.13 1994 WATER 16 24 8 447 3010 26 11900 1 26 25 7 3 3.5 3.4 3.3 3.2 3.0 3.1 3.0 2.9 5.6 5.2 5.5 4.1 3.3 4.4 3.3 3.1 3.1 4.3 5.1 3.8 3.3 3.8 3.9 22 34 12 7.7 7.6 8.1 7.0 5.7 191.3 6.17 34 2.9 379 .75 .86 12.2 20.2 1993 6.17 1994 YEARS 1992 .4 .5 .33 Jul , 7 6 Jun ,83 Jun Sep ,10 Sep .93 .99 .9 .3 5.2 5.9 5.2 5.7 4.6 21 22 11 7.6 6.7 12 11 7.0 5.4 9.1 8.8 7.0 5.9 12 78 40 21 11 12 7.5 5,9 5.6 4.8 4.2 5.1 --- 368.2 12,3 78 4.2 730 1,48 1.66 18.6 23.5 1992 12.3 1994 - 1994 1993 1994 11 1993 8 1994 8 1994 18 1993 18 1993 e Estimated RIO GRANDB DB LOIZA BASIN 50055170 RIO CAGUITAS NEAR CAOUAS, PR—Continued HATER-QUALITY RECORDS PERIOD OF RECORD.-- Hater years 1992 to current year. PERIOD OF DAILY RECORD.-- SUSPENDED-SEDIMENT DISCHARGEi June 1992 to September 1994 INSTRUMENTATION.-- DH-48 and automatic sediment sampler. REMARKS.— Sediment samples were collected by a local observer on a weekly basis and during high flow events. EXTREMES FOR PERIOD OF DAILY RECORD.-- SEDIMENT CONCENTRATION: Maximum daily mean, 2,950 mg/L Dec. 26, 1992; Minimum daily mean, 1 mg/L Jul. 18-19, 1994. SEDIMENT LOADSi Maximum daily mean, 14,000 tons (12,700 tonnes) Dec. 26, 1992; Minimum daily mean, <0.01 ton (<0.01 tonne) Jul. 16-17, 1994. 223 EXTREMES FOR HATER YEARS 1992-94.-- Hater Year 1992 1993 1994 Suspended-sediment concentration (mg/L) maximum minimum Suspended-sediment discharge (tons per day) maximum minimum 702 (Sep. 19) 2950 (Dec. 26) 1590 (Nov. 16) 6 (Several days) 2 (Apr. 18) 1 (Jun. 18-19) 1,230 (Sep. 19) 14,000 (Dec. 26) 2,340 (Nov. 16) .08 (Several days) .08 (Oat. 17) <0.01 (Jul. 16-17) SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), HATER YEAR OCTOBER 1991 TO SEPTEMBER 1992 DAY MEAN DISCHARGE (CFS) MEAN CONCEN- TRATION (MG/L) APRIL SEDIMENT DISCHARGE (TONS/DAY) MEAN DISCHARGE (CFS) MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) MAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL e!6 7.5 6.4 9.3 38 13 6.2 9.8 8.3 12 88 143 44 25 14 elO e6.2 e7.6 e7.2 10 16 126 26 11 16 13 26 368 604 131 58 27 23 19 13 12 .16 .52 56 1.1 .19 .48 .28 1.2 403 488 42 5.2 .98 e.62 e.40 e.26 e.24 MEAN DISCHARGE (CFS) e7.0 e6.6 e6.6 e6.4 e7.0 e6.2 e6.0 e8.6 •8.0 e!5 9.5 13 14 7.9 7.1 11 6.1 6.1 5.3 4.5 6.7 5.6 4.8 5.0 •5.4 • 5.4 • 5.2 •5.6 • 5.8 • 5.8 217.2 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) JUNE 12 11 10 10 11 11 10 12 14 37 15 27 24 14 11 22 11 10 9 8 10 9 8 8 8 8 8 8 8 8 •4 .22 .20 .18 .18 .20 .18 .16 .28 .30 3 .39 1.2 .90 .32 .19 1.2 .20 .16 .13 .10 .21 .14 .10 .09 • .12 • .12 • .12 • .12 • .12 • .12 12.25 e Estimated 224 DAY RIO GRANDE DE LOIZA BASIN 50055170 RIO CAOUITAS NEAR CAOUAS, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1991 TO SEPTEMBER 1992 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/Ii) (TONS/DAY) JULY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 e5.1 e5.6 e5.2 e5.6 e5.6 e6.4 e5.4 e5.4 e6.4 e5.8 «5.4 e6.8 e5.4 e5.0 e4.9 e5.4 e7.4 ell e7.2 e6.0 e5.6 e7.8 ell e6.8 e8.0 elO e6.8 e6.8 e5.4 e4.8 e5.0 8 8 8 8 8 9 8 8 9 9 8 9 9 8 8 8 10 16 16 11 10 11 16 16 13 15 15 15 15 12 8 .12 .12 .12 .12 .12 .16 .12 .12 .16 .14 .12 .16 .13 .10 .10 .12 .20 .48 .31 .18 .15 .22 .48 .28 .28 .40 .28 .28 .22 .15 .10 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) AUGUST e5.0 e5.2 e5.8 e8.0 e25 e!20 e!6 e8.2 e7.0 e6.2 e5.8 e6.0 e6.2 e5.6 e6.0 e5.4 e5.0 e4.9 e4.8 e4.6 e4.6 e4.6 e4.7 e5.0 e4.8 e4.5 5.0 5.0 5.0 5.2 6.6 8 e.10 8 e.12 8 e.12 11 e.24 56 e3 . 8 375 e!22 32 el. 4 14 13 12 12 11 11 10 10 8 7 6 6 6 6 6 6 7 8 .30 .24 .20 .18 .18 .17 .16 .15 .13 .10 .09 .08 .08 .08 .08 .08 .09 .10 10 e.12 11 .13 10 .12 8 .11 8 .10 8 .15 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) SEPTEMBER 4.8 4.5 5.1 5.4 17 13 8.5 7.5 21 6.5 5.4 4.9 4.8 5.3 6.8 13 11 7.8 131 111 75 117 48 17 12 9.5 8.8 8.4 7.8 8.0 8 8 8 8 46 28 16 15 53 11 8 8 8 10 10 31 19 14 702 412 212 503 138 37 22 16 14 14 13 13 .10 .08 .10 .11 5.0 1.4 .48 .56 4.7 .21 .12 .11 .10 .16 .21 1.6 .56 .33 1230 250 49 405 26 1.9 .68 .40 .32 .30 .26 .29 TOTAL 199.0 6.04 315.7 131.00 705.8 1980.08 e Estimated RIO GRANDE DE LOIZA BASIN 50055170 RIO CAGOITAS NEAR CAGDAS, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) NOVEMBER 225 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CPS) (MG/L) (TONS/DAY) OCTOBER 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 9.0 8.5 8.1 7.9 6.8 106 44 14 11 26 14 8.9 7.3 6.7 6.6 6.0 6.0 e28 e!2 e8.3 eV.O 7.6 7.3 9.3 7.5 6.2 5.9 5.4 6.7 6.1 5.7 15 14 13 12 11 256 123 31 19 69 29 17 15 14 11 6 5 41 70 60 31 14 16 22 24 20 14 12 10 7 7 .34 .31 .27 .23 .20 241 24 1.4 .59 13 1.5 .40 .29 .25 .18 .10 .08 e6.5 e2.5 el. 2 e.62 .25 .31 .57 .49 .34 .22 .17 .19 .12 .11 8.3 6.6 32 51 23 11 8.5 7.5 7.8 32 8.4 6.8 6.4 5.9 6.1 6.2 42 88 25 11 9.0 23 15 9.9 8.0 7.5 147 239 44 227 22 12 129 174 55 40 28 20 23 170 37 16 12 13 15 13 239 321 72 33 30 77 83 35 18 15 688 1320 170 1170 .68 .23 22 28 4.1 1.2 .64 .43 .47 30 .99 .31 .21 .21 .25 .19 116 179 6.7 .97 .83 10 4.4 .90 .38 .30 738 2540 25 2360 MEAN DISCHARGE (CFS) 57 27 17 16 12 12 9.9 9.3 9.1 8.8 8.6 8.0 7.7 37 20 9.5 9.3 8.5 8.2 8.1 7.5 17 9.5 11 40 401 103 32 115 52 56 MEAN CONCEN- TRATION (MG/L) DECEMBER 290 250 98 33 26 20 15 20 21 13 11 e 8 125 50 17 12 10 10 10 10 39 IB 15 112 2950 343 87 404 106 144 SEDIMENT DISCHARGE (TONS /DAY) 61 20 4.8 1.2 .86 .60 .42 .48 .50 .31 .25 .18 .17 87 4.8 .44 .29 .22 .20 .20 .19 2.7 .51 .43 29 14000 125 8.3 203 25 42 TOTAL 419.8 297.73 1122.9 6072.39 1147.0 14620.05 e Estimated 226 DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 RIO ORAMDB DB LOIZA BASIN 50055170 RIO CAOUITAS NEAR CAOUAS, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MO/L) (TONS/DAY) MEAN MEAN CONCEN- SEDIMENT MEAN DISCHARGE TRATION DISCHARGE DISCHARGE (CFS) (MO/L) (TONS/DAY) (CFS) JANUARY 22 20 18 18 18 16 106 44 21 19 18 17 16 15 14 14 13 13 13 12 12 27 37 14 13 13 12 12 12 11 11 63 47 16 16 19 21 404 140 20 15 14 10 12 22 22 14 13 18 19 13 10 69 104 23 19 20 16 19 20 13 9 3.5 2.4 .76 .71 .82 .88 306 26 1.2 .72 .64 .43 .50 .86 .81 .53 .48 .64 .63 .39 .30 16 28 .83 .67 .67 .51 .56 .59 .37 .27 11 11 13 10 10 9.7 9.7 9.5 9.3 9.1 9.4 9.4 9.8 8.6 8.5 12 12 8.8 8.4 8.2 8.6 8.5 8.3 7.4 6.9 7.0 6.7 6.7 ___ FEBRUARY 9 11 14 18 23 27 28 27 26 25 27 26 24 24 21 26 29 26 22 19 16 11 7 10 20 31 32 28 .27 .31 .47 .47 .59 .68 .68 .63 .61 .60 .63 .64 .58 .54 .46 1.2 .95 .62 .49 .41 .36 .24 .15 .18 .34 .54 .58 .51 MEAN DISCHARGE (CPS) 7.8 7.6 6.9 6.8 6.6 6.0 6.4 6.5 6.7 6.3 5.8 5.4 5.9 6.0 5.6 6.3 6.7 6.5 6.4 6.1 5.5 5.6 6.1 6.6 6.2 6.4 6.2 5.7 6.0 5.9 5.6 MEAN CONCEN- TRATION (MG/L) MARCH 25 20 13 10 10 10 13 13 11 14 14 11 10 14 22 27 20 13 11 10 10 10 9 7 14 27 35 26 14 12 18 SEDIMENT DISCHARGE (TONS/DAY) .52 .41 .24 .18 .17 .16 .22 .22 .19 .23 .21 .15 .14 .22 .33 .43 .37 .23 .19 .17 .15 .14 .14 .13 .23 .43 .53 .39 .20 .17 .27 TOTAL 621 397.67 257.5 14.73 194.1 7.76 AY 1 2 3 4 5 C 7 8 9 10 11 12 13 14 15 1C 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN DISCHAROB (CPS) 5.C 5.5 5.9 5.8 C.I C.2 C.3 11 18 13 12 18 43 17 251 53 19 14 12 50 25 19 13 13 12 16 25 21 86 33 --. RIO GRANDS DB LOIZA BASIN 50055170 RIO CAOUITAS NEAR CAOUAS, PR--Continu*d SEDIMENT DISCHAROB, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 MEAN CONCEN- SEDIMENT TRATION DISCHAROB (MO/L) (TONS/DAY) APRIL 227 35 49 48 34 20 14 12 23 46 29 26 43 131 38 1610 166 25 2 7 166 68 54 26 15 28 46 105 79 666 177 .50 .71 .71 .50 .29 .20 .19 1.3 2.9 1.2 1.3 2.4 47 2.1 5900 37 1.5 .07 .22 67 4.8 3.0 .95 .48 .84 3.8 11 8.4 530 19 MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHAROB TRATION DISCHAROB DISCHAROB TRATION DISCHAROB (CPS) (MO/L) (TONS/DAY) (CPS) (MO/L) (TONS/DAY) MAY 94 130 43 20 18 €8 31 18 111 41 22 18 1C 307 32 18 15 13 13 13 12 12 49 1C 14 57 22 1C 13 13 12 403 425 143 65 63 231 100 90 37C 111 39 17 19 1C70 46 30 29 22 14 10 7 8 224 42 25 204 27 11 14 15 11 239 195 23 3.4 3.1 91 11 4.C 1C2 15 2.5 .80 .84 4290 5.1 1.4 1.2 .83 .43 .28 .22 .24 153 2.1 .94 131 1.9 .49 .49 .49 .34 JUNE 11 11 10 9.9 9.9 9.0 8.9 9.9 9.7 10 9.8 9.7 9.8 12 13 11 9.5 11 80 57 1C 1C 12 11 11 10 9.8 12 12 15___ 12 1C 17 17 17 19 21 21 15 11 21 27 21 23 27 25 19 20 27C 170 30 22 20 19 17 1C 15 22 21 32 ___ .35 .44 .44 .45 .44 .44 .49 .52 .40 .28 .53 .66 .52 .99 1.1 .84 .47 .78 89 53 1.3 .90 .65 .55 .47 .42 .39 .91 .68 1.6 --- TOTAL 835.4 6C49.3C 1277 5341.69 44C.9 ICO.01 228 RIO ORANDB DB LOIZA BASIN 50055170 RIO CAGOITAS NEAR CAGUAS, PR—Continued SEDIMENT DISCHAROE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 MEAN DISCHAROE DAY (CFS) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL YEAR 11 11 15 11 9.5 9.2 14 11 8.8 8.4 447 56 67 32 31 22 16 15 17 16 16 111 163 139 38 25 21 18 17 17 17 1409.9 8955.9 MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT TRATION DISCHARGE DISCHAROE TRATION DISCHAROE (MO/I.) (TONS/DAY) (CFS) (MO/I.) (TONS/DAY) JULY 13 17 31 19 10 10 51 15 11 13 2890 1470 275 87 81 43 28 25 21 20 20 578 670 670 97 60 45 26 15 14 12 —— MEAN DISCHARGE (CFS) AUGUST 1 . 1. . • 3. . . • 7540 204 106 9. 15 3. 1. 1. . • 787 511 594 11 4. 2. 1. . . • 9803. 52474. 36 59 6 64 23 24 2 48 25 30 7 2 3 0 88 86 86 3 6 2 68 65 53 65 45 16 15 15 15 15 14 14 14 13 14 14 13 13 13 15 168 24 16 14 13 13 36 24 15 14 13 13 12 13 12 12 625 11 10 10 10 10 10 10 10 15 19 20 19 14 9 23 990 52 20 18 16 15 97 51 18 21 26 19 6 6 8 6 —— .44 .42 .43 .42 .42 .38 .38 .38 .54 .70 .73 .64 .47 .32 1.1 808 4.1 .79 .64 .52 .48 19 4.4 .67 .74 .88 .62 .21 .21 .25 .19 849.47 11 11 11 13 17 22 14 12 11 11 11 9. 10 9. 11 15 11 204 25 20 11 9. 16 13 9. 11 9. 20 27 14-- 599. 2 9 5 4 4 - 4 MEAN CONCEN- SEDIMENT TRATION DISCHAROE (MO/I.) (TONS/DAY) SEPTEMBER 15 33 44 46 51 52 57 42 41 30 30 24 19 19 17 31 20 1570 103 84 95 34 34 62 49 41 22 73 95 27 .44 .96 1.3 1.6 4.6 4.9 2.3 1.3 1.2 .90 .88 .65 .48 .50 .48 1.8 .66 8180 8.2 8.4 3.0 .87 2.9 2.5 1.2 1.2 .62 12 13 1.1 8259.94 RIO GRANDE DE LOIZA BASIN 50055170 RIO CAGDITAS NEAR CAGDAS, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) OCTOBER 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 8.8 33 66 27 15 14 23 14 12 11 10 11 9.9 8.9 9.2 68 24 13 ell e9.6 e9.0 e9.0 ell elO e9.0 e9.0 e9.0 8.7 7.8 7.6 7.0 18 113 261 72 36 34 72 26 21 25 28 30 31 24 18 377 208 21 18 20 22 20 16 16 15 10 8 16 50 52 38 .42 32 115 7.4 1.6 1.4 7.3 1.0 .69 .71 .83 .90 .88 .58 .44 237 16 .74 e.51 e.50 e.53 e.49 e.46 e.42 e.37 e.25 e.23 .37 1.1 1.1 .71 MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE (CPS) (MG/L) (TONS/DAY) (CPS) (MG/L) (TONS/DAY) NOVEMBER 7.5 7.3 7.1 7.1 6.9 6.9 6.7 10 9.6 7.4 7.9 6.9 6.5 12 18 187 34 161 69 45 37 17 13 11 11 13 10 9.8 9.2 9.2 40 3d 12 7 10 14 12 59 34 10 11 5 12 27 57 1590 254 1030 335 146 92 21 12 41 64 70 75 76 64 72 .92 .70 .24 .15 .17 .26 .22 2.3 .94 .20 .24 .11 .25 1.0 2.6 2340 24 945 102 24 10 1.0 .45 1.2 1.9 2.4 2.2 2.0 1.6 1.8 DECEMBER 8.7 8.5 8.6 8.5 9.4 8.6 8.6 8.4 8.6 8.5 7.9 7.9 7.9 7.9 7.8 7.6 7.6 9.2 8.3 7.3 7.3 7.3 7.3 7.3 7.2 6.9 6.9 7.2 7.3 7.2 7.0 94 88 72 65 59 54 46 45 64 75 59 38 22 15 22 41 55 51 20 41 55 38 20 15 18 19 44 65 37 24 11 2.2 2.0 1.6 1.5 1.6 1.3 1.0 .99 1.5 1.7 1.3 .81 .47 .31 .46 .83 1.1 1.2 .48 .81 1.1 .74 .39 .29 .35 .34 .81 1.3 .73 .46 .20 TOTAL 495.5 —- 431.93 764.0 —— 3469.87 244.7 —— 29.87 e Estimated 230 RIO GRANDS DB LOIZA BASIN 50055170 RIO CAOUITAS NEAR CAOOAS, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) JANUARY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1C 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 7.0 7.3 7.6 7.3 7.7 7.5 8.0 8.0 7.6 7.6 14 12 8.3 8.0 6.7 6.6 7.4 7.9 6.8 9.7 8.9 7.5 7.0 7.0 6.9 6.6 6.6 7.3 8.3 7.0 6.9 9 6 30 56 32 32 17 17 15 15 62 92 33 24 52 66 49 48 43 28 40 66 61 50 49 26 3 4 5 5 4 .17 .13 .61 1.1 .64 .64 .39 .39 .30 .30 3.3 3.5 .77 .56 .95 1.2 .99 1.0 .76 .83 .97 1.3 1.2 .93 .90 .47 .06 .09 .11 .10 .08 FEBRUARY 7.4 7.0 7.2 7.7 7.2 6.9 6.7 6.8 6.7 6.7 6.6 6.4 6.4 6.7 7.0 6.4 6.1 5.8 6.8 7.0 6.4 6.4 7.5 7.3 6.8 6.7 6.9 7.7 3 8 19 31 43 42 22 6 9 14 13 12 12 19 41 54 50 50 50 39 20 12 15 15 14 13 15 16 —— .06 .15 .36 .61 .82 .78 .40 .11 .17 .26 .23 .20 .20 .37 .76 .92 .82 .80 .86 .73 .36 .20 .27 .28 .26 .23 .30 .33 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) MARCH 19 12 7.3 6.4 5.8 5.4 5.3 5.0 5.1 6.5 5.1 .7 .7 .3 .2 .0 .3 .0 .0 .0 .0 .0 .2 .6 .4 .2 .0 .0 3.9 e3.9 e3.6 56 28 14 12 12 11 10 10 10 14 10 9 8 8 8 8 8 5 2 5 8 8 8 8 8 8 8 7 7 7 7 8.1 1.1 .25 .20 .18 .15 .14 .14 .14 .30 .13 .12 .11 .10 .10 .09 .08 .06 .03 .05 .08 .08 .09 .10 .10 .09 .08 .08 .08 e.08 e.07 TOTAL 243.0 24.74 191.2 11.84 165.9 12.50 e Estimated RIO GRANDE DB LOIZA BASIN 231 50055170 RIO CAG0ITAS NEAR CAGOAS, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN MEAN CONCBN- SEDIMENT MEAN DISCHARGE TRATION DISCHARGE DISCHARGE DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 (CFS) (MG/L) (TONS/DAY) (CFS) APRIL •3.3 7 •3.3 7 •3.4 7 •3.4 6 •4.0 8 •4.2 7 •4.0 6 •3.8 6 •3.9 6 •7.3 16 •6.6 13 •6.9 14 4.4 8 4.3 6 4.8 9 5.9 13 4.3 8 4.1 7 3.9 7 3.6 6 3.5 6 3.2 6 3.1 6 3.1 6 3.0 5 2.9 5 3.4 6 5.3 43 3.7 40 3.4 40 ___ ___ .06 3.1 .06 3.0 .06 3.1 .06 2.9 .10 2.7 .08 3.2 .06 3.2 .06 2.8 .07 2.6 .70 2.7 .26 3.9 .29 3.0 .12 2.6 .06 2.3 .14 2.1 .27 2.1 .11 2.2 .09 1.8 .08 2.0 .07 1.7 .06 1.4 .06 1.3 .06 1.2 .06 1.6 .05 1.9 .04 2.5 .05 1.7 .61 2.1 .39 1.4 .36 2.2 1.2 MEAN CONCEN- TRATION (MG/L) MAY 47 47 31 14 18 29 25 16 10 8 8 8 7 8 13 23 33 32 16 22 35 17 4 4 5 8 25 45 37 15 33 SEDIMENT DISCHARGE (TONS/DAY) .40 .38 .26 .11 .13 .23 .21 .13 .07 .07 .07 .06 .05 .06 .07 .18 .19 .15 .07 .09 .14 .07 .02 .02 .03 .07 .11 .17 .13 .08 .10 MEAN DISCHARGE (CPS) 1.0 .83 .89 .85 • .84 •3.8 .90 .76 .84 .76 .98 .76 .84 .84 .76 •1.1 •1.8 •1.6 •1.3 •1.1 •1.9 •1.8 1.7 1.4 1.4 8.1 3.5 2.3 1.8 4.8 MEAN CONCBN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) JUNE 51 .13 53 .11 53 .11 52 .12 52 «.12 51 .52 48 62 72 69 67 43 17 13 12 6 3 1 1 3 6 10 .12 .13 .17 .14 .17 .08 .04 .03 .03 .02 .01 .01 .01 .01 .03 .04 21 .09 35 .13 22 .08 14 .66 7 .07 11 .07 13 .06 35 1.3 __- -_- TOTAL 124.0 4.54 71.5 3.92 51.25 4.59 • Estimated 232 RIO GRANDS DE LOIZA BASIN 50055170 RIO CAGUITAS NEAR CAOTAS, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/ DAY) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL YEAR 2.9 2.1 1.8 1.6 1.5 2.4 2.3 1.7 1.7 1.5 1.5 1.4 1.3 1.3 1.3 1.4 1.4 34 13 6.4 .7 .0 .5 .7 .9 .8 .5 .2 3.5 3.4 3.4 128.1 3038.65 JDLY 27 23 22 14 11 14 13 9 5 4 4 3 3 4 3 2 2 96 23 7 5 6 6 6 7 9 13 15 9 5 8 —— MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) AUGUST .20 .12 .10 .06 .04 .07 .08 .05 .03 .02 .02 .02 .02 .02 .01 <.01 <.01 20 1.0 .12 .07 .06 .07 .08 .09 .11 .15 .15 .09 .05 .08 22.98 4172.73 3.5 3.4 3.3 3.2 3.0 3.1 3.0 2.9 5.6 5.2 5.5 4.1 3.3 4.4 3.3 3.1 3.1 4.3 5.1 3.8 3.3 3.8 3.9 22 34 12 7.7 7.6 8.1 7.0 5.7 191.3 9 7 5 5 7 6 5 4 6 8 10 8 5 10 5 5 5 5 5 5 5 5 6 71 73 16 27 28 18 11 12 —— .09 .07 .05 .05 .06 .05 .05 .04 .09 .11 .12 .09 .04 .15 .04 .04 .04 .06 .07 .05 .04 .06 .07 13 9.7 .50 .51 .63 .39 .19 .21 26.66 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CPS) (MG/L) (TONS/DAY) SEPTEMBER 5.2 5.9 5.2 5.7 4.6 21 22 11 7.6 6.7 12 11 7.0 5.4 9.1 8.8 7.0 5.9 12 78 40 21 11 12 7.5 5.9 5.6 4.8 4.2 5.1 368.2 12 12 8 10 6 61 58 23 14 14 26 21 13 11 22 19 14 11 32 283 112 37 5 6 5 4 4 4 4 7 —— .18 .30 .12 .15 .09 7.1 3.9 .71 .26 .30 1.1 .68 .24 .16 .79 .46 .27 .16 3.6 89 16 2.9 .15 .21 .10 .06 .06 .05 .04 .15 129.29 RIO GRANDE DE LOIZA BASIN 50055170 RIO CAGUITAS NEAR CAGUAS, PR—Continued HATER QUALITY DATA, MATER YEAR OCTOBER 1992 TO SEPTEMBER 1994 PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT 233 DATE OCT 1992 06... NOV 17. .. 18... 30... DEC 01. .. 25. .. APR 1993 15... 20. .. 20... 29... DATE OCT 1992 06.. . NOV 17... 18.. . 30.. . DEC 01... 25... APR 1993 15... 20... 20... 29.. . TIME 1638 1954 1507 0630 1655 1745 1600 1730 1835 1700 SED. SUSP. FALL DIAM. PERCENT FINER THAN .016 MM 81.7 82.5 78.4 84 75.8 87.4 49 83 86 74 DIS- CHARGE, INST. CUBIC FEET PER SECOND 450 299 340 284 98 135 768 211 210 172 SED. SUSP. FALL DIAM. PERCENT FINER THAN .031 MM 83.7 86.4 85.4 87.6 85.2 — 59.6 87 90 82 SEDI- MENT, SUS- PENDED (MO/L) 1790 2850 2170 1030 1430 907 7450 1770 1850 1860 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .062 MM 97.1 98.5 98.1 98.5 97.5 97.5 75.2 97.7 97 96.6 SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) 2170 2300 1990 790 378 331 1540 1000 1050 863 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .125 MM 98.5 99.5 99.4 99.3 99.5 99 86.3 99.2 98.3 99.4 SED. SUSP. FALL DIAM. PERCENT FINER THAN .002 MM 55 55 57 67 59 70 28 54 55 53 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .250 MM 99.4 99.8 99.9 99.7 99.8 99.5 94.7 99.6 98.8 99.9 SED. SUSP. FALL DIAM. PERCENT FINER THAN .004 MM 64 69 66 72 67 76 32 62 68 59 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .500 MM 99.8 99.9 100 99.8 99.9 99.7 98.2 99.8 99.4 100 SED. SUSP. FALL DIAM. PERCENT FINER THAN .008 MM -- 74.6 71.7 77.5 69.4 81.3 40.7 72 75.6 65 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN 1.00 MM 99.9 100 100 99.9 100 99.9 99.8 99.1 99.9 100 234 RIO ORANDB DE LOIZA BASIN 50055170 RIO CAGUITAS NEAR CAGUAS, PR—Continued WATBR QUALITY DATA, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1994 PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT DATE MAY 1993 14... JUL 22... AUO 16... SEP 22. .. NOV 16... 16. .. 18... DATE MAY 1993 14... JUL 22... AUO 16.. . SEP 22... NOV 16.. . 16.. . 18... TIME 0750 1545 1015 1610 0700 0805 1345 SED. SUSP. FALL DIAM. PERCENT FINER THAN .016 MM 59 56 60 71 81 78 75 DIS- CHARGE, INST. CUBIC FEET PER SECOND 553 16 552 9.5 960 486 272 SED. SUSP. FALL DIAM. PERCENT FINER THAN .031 MM 70 71 72 74 89 89 84 SEDI- MENT, SUS- PENDED (MO/L) 11900 16 4160 2120 6310 4260 2720 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .062 MM 89 88 85 95 99 98 97 SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) 17800 251 6200 54 16360 5580 2000 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .125 MM 95.7 97.5 95 98.5 99.7 99 99 SED. SUSP. FALL DIAM. PERCENT FINER THAN .002 MM 32 31 32 55 43 56 49 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .250 MM 98.8 99.4 98.6 99.6 99.9 99.8 99.8 SED. SUSP. FALL DIAM. PERCENT FINER THAN .004 MM 40 41 39 59 54 59 56 SBD. SUSP. SIEVE DIAM. PERCENT FINER THAN .500 MM 99.7 99.9 99.3 100 100 99.9 99.9 SBD. SUSP. FALL DIAM. PERCENT FINER THAN .008 MM 45.3 43.2 48 64 68 70 63 SBD. SUSP. SIEVE DIAM. PERCENT FINER THAN 1.00 MM 99.9 100 99.8 100 100 100 100 RIO QRANDB DE LOIZA BASIN 50055170 RIO CAGUITAS NERAR CAGUAS, PR--Continued WATER QUALITY DATA, WATER YEAR OCTOBER 1991 TO SEPTEMBER 1993 SILT AND CLAY PERCENT OF SUSPENDED SEDIMENT 235 DATE SEP 1992 22.. . 22.. . OCT 06.. . 06... NOV 17.. . 18... 28... 30... DEC 02.. . 25... JAN 1993 05.. . 07... FEB 04... APR 09.. . 11... 13... 14... 20.. . 29... 29... MAY 09... 14... 23... ATTO 16... 16... TIME 1530 1748 1453 1538 1919 1437 1630 0734 1715 1715 1800 1425 1730 1300 1545 1105 1005 1435 1728 1755 1515 0940 1700 0900 1429 STREAM- FLOW, INSTAN- TANEOUS (CFS) 349 393 309 745 296 23 153 230 22 150 25 20 11 9.2 9.9 11 15 18 311 560 80 1490 148 190 363 SEDI- MENT, SUS- PENDED (MO/L) 590 1170 506 1220 863 1020 584 707 215 656 988 255 134 138 79 388 395 330 6590 1610 309 7170 780 1450 2010 SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) 556 1240 422 2450 690 63 241 439 13 266 67 14 4 3.4 2.1 12 16 16 5530 2430 67 28800 312 744 1970 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .062 MM 92 97 93 90 93 97 99 98 92 99 78 97 97 70 96 99 94 98 52 94 80 79 96 94 91 236 RIO GRANDE DE LOIZA BASIN 50055170 RIO CAGtJITAS NEAR CAGtJAS, PR--Continued WATER QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 SILT AND CLAY PERCENT OF SUSPENDED SEDIMENT DATE TIME STREAM- FLOW, INSTAN- TANEOUS (CFS) SEDI- MENT, SUS- PENDED (MG/L) SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .062 MM OCT 1993 16. .. JUL 1994 18... 18. .. 18... 1515 1245 1315 1405 29 30 62 63 119 90 87 105 9.3 7.3 15 18 97 95 98 91 RIO GRANDE DE LOIZA BASIN 50055225 RIO CAGUITAS AT VILLA BLANCA AT CAGUAS, PR 237 LOCATION.--Lat 180 14'55 M , long 66°01'40", Hydrologic Unit 21010005, on left bank, at C. 4 street Villa Blanca housing area at Caguas, 1.8 mi (2.9 km) upstream from Rio Grande de Loiza, and 0.95 mi (1.53 km) northeast from Caguas Plaza. DRAINAGE AREA.--11.71 mi* (30.33 km'). WATER-DISCHARGE RECORDS PERIOD OP RECORD.—December 1990 to current year. GAGE.--Hater-stage recorder. Elevation of gage is 164 ft (50 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. Gage-height and precipitation satellite telemetry at station. DISCHARGE, CUBIC FEET PER SECOND, HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY NOV DEC APR MAY JDN JUL AUG SEP 1 e!4 e!2 2 e50 ell 3 ellO ell 4 e46 elO 5 e24 elO 6 e22 e9.8 7 e38 e9.6 8 e22 e!6 9 e!9 e!5 10 e!8 e!2 11 e!6 e!3 12 e!8 ell 13 e!6 elO 14 e!4 e20 15 e!5 e29 16 ellO e300 17 e40 e54 18 e21 e260 19 e!8 e!40 20 e!5 e70 21 e!4 e60 22 e!4 e28 23 e!8 e20 24 e!6 e!7 25 e!4 e!7 26 e!4 e21 27 e!4 e!6 28 e!4 e!5 29 e!3 e!4 30 e!2 e!4 31 ell --- TOTAL 800 1245.4 MEAN 25.8 41.5 MAX 110 300 MIN 11 9.6 AC-FT 1590 2470 CPSM 2.20 3.55 IN. 2.54 3.96 STATISTICS OF MONTHLY MEAN MEAN 24.5 44.3 MAX 27.6 56.8 (WY) 1993 1993 MIN 20.0 34.5 (WY) 1992 1992 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN-DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE ANNUAL RUNOFF (AC-PT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS e!3 e!2 e!3 e!2 e!5 e!3 e!3 e!2 e!3 e!3 e!2 e!2 e!2 e!2 e!2 ell ell e!5 e!3 e!2 e!2 e!2 e!2 e!2 ell elO elO ell e!2 ell elO 374 12.1 15 10 742 1.03 1.19 DATA 29.2 58.4 1993 12.1 1994 FOR elO ell e!2 ell e!2 ell e!3 e!3 e!2 e!2 e27 e24 e!6 e!5 e!3 e!2 e!4 e!6 e!3 e!9 e!8 e!6 e!4 e!4 e!4 e!3 e!3 e!4 e!7 e!4 e!3 446 14.4 27 10 885 1.23 1.42 FOR WATER 46.3 120 1992 14.4 1994 e!5 e!3 e!4 e!5 e!4 e!3 e!3 e!4 e!3 e!3 e!3 e!2 e!2 e!3 e!4 e!3 e!2 ell e!3 e!4 e!3 e!3 e!5 e!4 e!3 e!2 e!3 e!5 ___ ___ --- 372 13.3 15 11 738 1.13 1.18 YEARS 1991 16.9 23.8 1991 10.8 1992 e40 e!7 ell e8.6 e7.6 e7.0 e6.8 e6.4 e6.6 e8.4 e6.8 e6.0 e6.0 e5.6 e5.4 e5.2 e5.6 e5.2 e5.2 e5.2 e5.2 e5.2 e5.4 e6.0 e5.6 e5.4 e5.2 e5.2 e5.0 e5.0 e4.8 233.6 7.54 40 4.8 463 .64 .74 - 1994 10.9 15.3 1991 7.54 1994 1993 CALENDAR YEAR 12700. 34. 851 6. 6. 25190 2. 40. 48 24 11 5 8 Jul 11 0 Apr 4 6 Mar 31 97 35 e4.3 e4.3 e4.4 e4.4 e5.2 e5.6 e5.2 e5.0 e5.2 e9.8 e8.8 e9.2 e5.8 e5.2 e6.0 e8.0 e5.8 e5.6 e5.2 e5.0 e4.8 e4.4 e4.2 e4.2 e4.0 e3.8 e4.5 e7.2 e5.0 e4.7 --- 164.8 5.49 9.8 3.8 327 .47 .52 e4.3 e4.0 e4.3 e3.9 e3.6 e4.4 e4.4 e3.9 e3.5 e3.6 e5.2 e4.0 e3.6 e3.2 e2.8 e2.8 e3.0 e2.4 e2.3 e2.2 e2.2 e4.1 e2.0 e2.7 e3.1 e4.1 e2.8 e3.5 e2.3 e3.6 e2.0 103.8 3.35 5.2 2.0 206 .29 .33 el. 7 el. 4 el. 5 el. 4 el. 4 e6.4 el. 5 el. 3 el. 4 el. 3 el. 7 el. 3 el. 4 el. 4 el. 3 el. 8 e3.0 e2.7 e2.2 el. 8 e3.2 e3.0 e2.8 e2.3 e2.3 e!3 e6.4 e3.8 e3.0 e8.0 --- 85.7 2.86 13 1.3 170 .24 .27 e5.0 e3.7 e3.0 e2.6 e2.4 e3.8 e3.7 e2.7 e2.7 e2.4 e2.4 e2.2 e2.1 e2.1 e2.1 e2.2 e2.2 e29 elO e5.4 e3.7 e3.2 e3.5 e3.7 e3.1 e3.8 e3.6 e3.4 e2.8 e2.7 e2.7 127.9 4.13 29 2.1 254 .35 .41 e2.8 e2.7 e2.6 e2.5 e2.4 e2.5 e2.4 e2.3 e4.5 e4.2 e4.4 e3.4 e2.7 e3.5 e2.7 e2.5 e2.5 e3.4 e4.1 e3.1 e2.7 e3.0 e3.1 elO e!6 e5.4 e3.6 e3.5 e3.9 e3.3 e2.7 118.4 3.82 16 2.3 235 .33 .38 e2.4 e2.8 e2.4 e2.7 e2.1 e9.6 elO e5.2 e3.5 e3.1 e5.6 e5.2 e3.3 e2.5 e4.3 e4.1 e3.3 e2.7 e5.2 e36 e!8 elO e5.2 e5.6 e3.9 e2.8 e2.6 e2.3 e2.0 e2.4 --- 170.8 5.69 36 2.0 339 .49 .54 , BY WATER YEAR (WY) 16.9 39.8 1993 5.49 1994 FOR 1994 4242. 11. 300 1. 1. 300 8410 13, 17 6. 2. 27.7 59.8 1993 3.35 1994 WATER YEAR ,4 ,6 Nov 16 , 3 Jun 8 , 4 Jun 8 Nov 16 , 00 Nov 16 .99 48 ,0 ,4 15.2 30.7 1993 2.86 1994 29.0 74.6 1993 4.13 1994 WATER 27 40 11 1930 1 1 13400 19 19790 2 31 37 14 4 22.0 36.1 1992 3.82 1994 YEARS 1991 .3 .1 .6 Jan .3 Jun .4 Jun Jan . 9 1 Jan .33 .69 .4 25.6 44.2 1992 5.69 1994 - 1994 1993 1994 5 1992 8 1994 8 1994 5 1992 5 1992 e Estimated 238 RIO ORANDE DE LOIZA BASIN 50055225 RIO CAODITAS AT VILLA BLANCA AT CAGUAS, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORD.-- Water years 1991 to current year. PERIOD OF DAILY RECORD.-- SUSPENDED-SEDIMENT DISCHARGEi December 1990 to September 1994 INSTRUMENTATION.-- DH-48 and automatic sediment sampler. REMARKS.— Sediment samples were collected by a local observer on a weekly basis and during high flow events. EXTREMES FOR PERIOD OF DAILY RECORD.« SEDIMENT CONCENTRATION! Maximum daily mean, 1,430 mg/L Jan. 05, 1992; Minimum daily mean, 5 mg/L Several days. SEDIMENT LOADSi Maximum daily mean, 6,620 tons (6,000 tonnes) Jan. 05, 1992; Minimum daily mean, •0.03 ton (0.02 tonne) Jun. 15, 1994 EXTREMES FOR WATER YEAR 1994.-- SBDIMBNT CONCENTRATIONt Maximum daily mean, 700 mg/L Nov. 16, 1993; Minimum daily mean, 5 mg/L Several days. SEDIMENT LOADS i Maximum daily mean, e657 tons (596 tonnes) Nov. 16, 1993; Minimum daily mean, eO.03 ton (0.02 tonne) Jun.15, 1994. SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN CONCEN- SEDIMENT TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MO/L) (TONS/DAY) 1 2 3 4 5 6 7 e 9 10 11 12 13 14 15 16 17 ie 19 20 21 22 23 24 25 26 27 26 29 30 31 TOTAL MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) MEAN DISCHARGE (CFS) OCTOBER •14 •50 • 110 •46 •24 •22 •38 •22 •19 eie el 6 eie el 6 •14 •15 • 110 e40 •21 eie •15 •14 •14 eie •16 •14 •14 •14 •14 •13 •12 ell 120 203 153 53 23 21 24 28 30 30 30 23 17 20 66 270 113 30 22 20 61 97 67 79 76 76 76 76 63 66 90 •4.5 •27 •45 •6.5 el. 5 el. 2 •2.4 el. 6 el. 5 el. 5 el. 3 el.l • .73 • .74 •2.7 •80 •16 el. 7 el.l • .82 •2.3 •3.7 •4.2 •3.4 •2.9 •2.9 •2.9 •2.9 •2.9 •2.9 •2.7 • 12 ell ell elO elO •9.8 •9.6 • 16 • 15 • 12 • 13 ell elO •20 •29 •300 *54 •260 •140 e70 •60 •28 •20 •17 e!7 •21 • 16 • 15 • 14 • 14 ___ NOVEMBER •12 ell ell elO elO •9.8 •9.6 • 16 • 15 • 12 • 13 ell elO •20 •29 •300 *54 •260 •140 e70 •60 •28 •20 •17 e!7 •21 • 16 • 15 • 14 • 14 91 94 97 99 103 113 126 143 155 165 175 160 160 160 160 700 174 611 340 177 102 69 97 99 66 71 50 34 29 43 •2.9 •2.8 •2.9 •2.7 •2.8 •3.0 •3.3 •6.2 •6.3 •5.3 •6.1 •5.3 •4.9 •9.7 •14 •567 •25 •429 • 129 •33 •16 •5.2 •5.2 •4.5 •4.0 •4.0 •2.2 el. 4 el.l el. 6 MEAN DISCHARGE (CFS) e!3 e!2 e!3 •12 •15 •13 •13 •12 •13 •13 •12 •12 •12 •12 •12 ell ell •15 •13 •12 •12 •12 •12 •12 ell elO elO ell •12 ell elO MEAN CONCEN- TRATION (MG/L) DECEMBER 73 94 76 39 20 23 44 67 69 56 44 32 19 13 45 130 246 260 170 112 92 ee 63 eo 76 71 73 78 eo eo eo SEDIMENT DISCHARGE (TONS/DAY) •2.6 • 3.1 •2.7 el. 3 e.ei • .79 el. 5 •2.2 •2.4 •2.0 el. 4 el.O • .60 • .42 el. 4 •3.9 •7.4 ell •6.0 e3.6 •3.0 •2.9 •2.7 •2,6 •2.3 el. 9 •2.0 •2.3 •2.6 •2.4 •2.2 eoo 232.59 1245.4 1306.4 374 63.02 e Estimated RIO GRANDB DB LOIZA BASIN 239 50055225 RIO CAGOITAS XT VILLA BLANCA AT CAGOAS, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY}, HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MO/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) JANUARY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 IB 19 20 21 22 23 24 25 26 27 28 29 30 31 •10 •11 •12 •11 012 •11 •13 •13 •12 •12 •27 •24 •16 •15 •13 •12 •14 •16 •13 •19 •18 •16 •14 •14 •14 •13 •13 •14 •17 •14 •13 80 80 80 73 51 28 21 24 38 69 69 35 20 31 54 72 78 78 75 60 37 15 7 11 15 23 37 57 64 50 39 •2.2 •2.4 •2.6 •2.2 • 1.6 • .83 • .74 • .83 •1.2 •2.2 •5.0 •2.3 • .86 •1.3 • 1.9 •2.3 •2.9 •3.4 •2.6 •3.1 •1.8 • .65 • .28 • .42 • .57 • .81 •1.3 •2.1 •2.9 •1.9 •1.4 FEBRUARY • 15 • 13 •14 015 014 •13 •13 •14 •13 •13 •13 •12 •12 • 13 • 14 •13 •12 •11 •13 •14 •13 •13 •15 •14 013 •12 •13 • 15 ___ 28 13 10 26 58 87 96 92 80 53 25 13 19 38 63 82 95 102 96 85 71 53 35 19 24 58 106 121 •1.1 • .46 • .36 •1.0 •2.2 •3.1 •3.4 •3.5 •2.8 •1.8 • .86 • .41 • .CO •1.3 •2.4 •2.9 •3.1 •3.0 •3.4 •3.2 •2.5 •1.9 •1.4 • .70 • .82 •1.9 •3.7 •4.9 ___ MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) MARCH •40 •17 •11 •8.6 07.6 •7.0 •6.8 •6.4 • 6.6 •8.4 •6.8 • 6.0 • 6.0 •5.6 •5.4 •5.2 •5.6 •5.2 •5.2 •5.2 • 5.2 •5.2 •5.4 •6.0 •5.6 •5.4 •5.2 •5.2 •5.0 •5.0 •4.8 105 80 40 14 11 26 48 64 66 55 74 108 123 135 135 125 116 110 106 99 101 107 90 45 15 10 8 5 6 19 42 •11 •3.7 • 1.2 • .31 • .21 • .48 • .87 • 1.1 • 1.2 • 1.2 • 1.4 • 1.8 •2.0 •2.0 •2.0 •1.8 •1.8 • 1.5 • 1.5 • 1.4 •1.4 •1.5 •1.3 .73 .23 .14 .12 .08 .08 .25 .54 TOTAL 446 56.59 372 58.71 233.6 44.84 • Estimated 240 RIO GRANDE DE LOIZA BASIN 50055225 RIO CAGUITAS AT VILLA BLANCA AT CAGUAS, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 e4.3 e4.3 e4.4 e4.4 e5.2 e5.6 e5.2 eS.O e5.2 e9.8 e8.8 e9.2 e5.8 e5.2 e6.0 eS.O e5.8 e5.6 e5.2 eS.O e4.8 e4.4 e4.2 e4.2 e4.0 e3.8 e4.5 e7.2 eS.O e4.7 APRIL 66 67 44 30 24 21 19 17 14 30 29 23 14 14 28 45 61 75 85 95 105 115 125 130 131 132 126 115 103 83 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) MAY .76 .77 .53 .36 .34 .31 .27 .22 .19 .80 .69 .57 .22 .20 .46 .97 .96 • 1.1 el. 2 el. 3 el. 4 el. 4 el. 4 el. 5 el. 4 el. 3 el. 5 e2.2 el. 4 el.O ___ e4 e4 e4 e3 e3 e4 e4 e3 e3 e3 e5 e4 e3 e3 e2 e2 e3 e2 e2 e2 e2 e4 e2 e2 e3 e4 e2 e3 e2 e3 e2 .3 .0 .3 .9 .6 .4 .4 .9 .5 .6 .2 .0 .6 .2 .8 .8 .0 .4 .3 .2 .2 .1 .0 .7 .1 .1 .8 .5 .3 .6 .0 60 43 28 15 6 5 8 10 35 113 173 170 150 135 125 116 101 60 25 19 17 15 13 12 11 35 41 19 15 12 12 e.70 e.46 e.32 e.16 e.06 e.06 e.09 e.10 e.33 el.l e2.4 el. 8 el. 5 el. 2 e.94 e.87 e.81 e.39 e.15 e.ll e.10 e.17 e.07 e.08 e.09 e.39 e.31 e.18 e.09 e.12 e.06 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) JDNB el. 7 el. 4 el. 5 el. 4 el. 4 e6.4 el. 5 el. 3 el. 4 el. 3 el. 7 el. 3 el. 4 el. 4 el. 3 •1.8 e3.0 e2.7 e2.2 el. 8 e3.2 e3.0 e2.8 e2.3 e2.3 e!3 e6.4 e3.8 e3.0 eS.O 12 12 12 12 17 22 16 13 18 30 30 19 14 10 9 8 8 8 8 8 6 5 5 5 5 40 29 13 7 27 e.06 e.04 e.04 e.04 e.06 e.38 e.06 e.05 e.07 e.ll e.14 e.07 e.05 e.04 e.03 e.04 e.06 e.06 e.04 e.04 e.05 e.04 e.04 e.04 e.04 el. 4 e.51 e.13 e.06 e.58 TOTAL 164.8 26.72 103.8 15.21 85.7 4.37 e Estimated RIO GRANDS DE LOIZA BASIN 50055225 RIO CAGUITAS AT VILLA BLANCA AT CAGUAS, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 241 MEAN MEAN CONCEN- SEDIMENT MEAN DISCHARGE TRATION DISCHARGE DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) JULY MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) AUGUST MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) SEPTEMBER 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 •5.0 •3.7 •3.0 •2.6 •2.4 •3.8 •3.7 •2.7 •2.7 •2.4 •2.4 •2.2 •2.1 •2.1 •2.1 •2.2 •2.2 •29 •10 •5.4 •3.7 •3.2 •3.5 •3.7 •3.1 •3.8 •3.6 •3.4 •2.8 •2.7 •2.7 TOTAL 127.9 YEAR • 4242.4 Estimated 19 11 15 17 14 11 10 13 18 20 20 19 16 13 12 11 10 78 44 8 7 7 7 7 7 7 7 8 8 7 7 • .25 • .11 • .12 • .12 • .09 • .11 • .10 • .09 • .12 • .12 • .12 • .11 • .09 • .07 • .06 • .07 • .06 • .1 •1.2 • .12 • .06 • .06 • .06 • .06 • .06 • .08 • .07 • .08 • .06 • .06 • .06 9.94 1865.54 •2.8 •2.7 •2.6 •2.5 •2.4 •2.5 •2.4 •2.3 •4.5 •4.2 •4.4 •3.4 •2.7 •3.5 •2.7 •2.5 •2.5 •3.4 •4.1 •3.1 •2.7 •3.0 •3.1 •10 •16 •5.4 •3.6 •3.5 •3.9 •3.3 •2.7 118.4 6 6 6 6 6 6 6 6 6 5 10 33 58 67 69 68 57 39 23 13 11 8 7 33 41 33 16 13 16 15 12 • .05 • .04 • .04 • .04 • .04 • .04 • .04 • .04 • .08 • .06 • .12 • .30 • .42 • .63 • .51 • .46 • .38 • .36 • .25 • .11 • .08 • .07 • .06 • .90 •1.8 • .48 • .15 • .12 • .16 • .13 • .08 8.04 •2.4 •2.8 •2.4 •2.7 •2.1 •9.6 •10 •5.2 •3.5 •3.1 •5.6 •5.2 •3.3 •2.5 •4.3 •4.1 •3.3 •2.7 •5.2 •36 •18 •10 •5.2 •5.6 •3.9 •2.8 •2.6 •2.3 •2.0 •2.4 170.8 13 15 14 12 11 30 33 27 17 13 17 19 16 12 13 13 9 8 15 95 a .09 .11 .09 .08 .06 .78 .90 .37 .15 .10 .25 .27 .14 .07 .15 .15 .08 .06 .20 >.2 74 43 27 13 8 10 11 11 11 11 •3.6 •1.2 .37 .20 .08 .08 .08 .06 .06 .08 19.11 242 RIO GRANDE DE LOIZA BASIN 50055225 RIO CAGUITAS AT VILLA BLANCA AT CAGUAS, PR--Continued WATER QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 SILT AND CLAY PERCENT OF SUSPENDED SEDIMENT DATE NOV 1993 17... APR 1994 20... JDN 10... SEP 05... TIME 1305 1712 1615 1646 STREAM- FLOW, INSTAN- TANEOUS (CFS) 54 5.0 1.3 2.1 SEDI- MENT, SUS- PENDED (MO/L) 189 421 69 77 SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) 28 5 0 0 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .062 MM 88 .7 84 .24 82 .44 96 RIO GRANDB DB LOIZA BASIN 50055250 RIO CAGUITAS AT HIGHWAY 30 AT CAG0AS, PR WATER-QUALITY RECORDS LOCATION.--Lat 180 15'11", long 66°01'26", at Highway 30 bridge, and 0.8 mi (1.3 km) east of Caguas plaza. DRAINAGE AREA.--14.1 mi> (36.5 km'). PERIOD OF RECORD.--Water years 1972 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 243 DATE OCT 1993 08. .. DEC 07. .. FEB 1994 17... APR 05.. . JUN 17. .. AOG 05. .. DATE OCT 1993 08. .. DEC 07. .. FEB 1994 17. .. APR 05. .. JUN 17. .. AUG 05. .. DATE OCT 1993 08. .. DEC 07. .. FEB 1994 17. .. APR 05. .. JUN 17. .. AUG 05. .. TIME 0930 1040 0945 0840 0850 0745 HARD- NESS TOTAL (MG/L AS CACO3) 140 -- -- 150 -- 190 SILICA, DIS- SOLVED (MG/L AS SIO2) 32 -- -- 36 -- 39 DIS- CHARGE, INST. CUBIC FEET PER SECOND 34 37 20 15 29 6.5 CALCIUM DIS- SOLVED (MG/L AS CA) 37 -- -- 40 -- 51 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 261 -- -- 406 -- 490 SPE- CIFIC CON- DUCT- ANCE (US/CM) 506 575 650 672 522 864 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 12 -- -- 13 -- 15 SOLIDS, DIS- SOLVED (TONS PER DAY) 24.0 -- -- 16.2 -- 8.55 PH WATER WHOLE FIELD (STAND- ARD UNITS) 6.8 7.6 7.2 7.2 7.1 7.2 SODIUM, DIS- SOLVED (MG/L AS HA) 32 -- -- 59 -- 82 RESIDUE TOTAL AT 105 DBG. C, SUS- PENDED (MG/L) 538 226 602 740 704 290 TEMPER- ATURE WATER (DBG C) 29.0 26.0 25.0 27.0 27.5 27.0 SODIUM AD- SORP- TION RATIO 1 — -- 2 -- 3 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 13 11 15 18 9.8 13 TUR- BID- ITY (NTU) 340 21 160 200 92 150 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 5.6 -- -- 8.4 -- 11 PHOS- PHORUS TOTAL (MG/L AS P) 1.40 1.90 3.50 4.00 1.60 2.20 OXYGEN, DIS- SOLVED (MG/L) 3.2 4.0 1.8 0.4 1.8 0.4 ALKA- LINITY WAT WH TOT FBT FIELD MG/L AS CACO3 120 120 180 210 130 205 ARSENIC TOTAL (UG/L AS AS) <1 -- — <1 -- -- OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 41 49 21 5 22 5 SULFIDE TOTAL (MG/L AS S) <0.5 -- -- <0.5 -- "" BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) 100 -- -- <100 -- -- OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 72 41 95 110 72 85 SULFATB DIS- SOLVED (MG/L AS S04) 33 — -- 53 -- 74 BORON, TOTAL RECOV- ERABLE (UG/L AS B) 50 — -- 60 -- -- COLI- FORM, FECAL, 0.45 UM-MF (COLS./ 100 ML) 330000 75000 33000 240000 K92000 46000 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 37 -- -- 70 -- 95 CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) 2 -- -- 1 -- -- STREP- TOCOCCI FECAL, (COLS. PER 100 ML) 80000 28000 39000 540000 76000 1000 FLUO- RIDB, DIS- SOLVED (MG/L AS F) 0.30 -- -- 0.20 -- 0.30 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) 21 -- -- <10 -- — K = non-ideal count 244 RIO GRANDB DE LOIZA BASIN 50055250 RIO CAGUITAS AT HIGHWAY 30 AT CAGUAS, PR—Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE OCT 1993 08. .. DEC 07... FEB 1994 17. .. APR 05. .. JUN 17. .. AUG 05... COPPER, TOTAL RECOV- ERABLE (UG/L AS CO) 80 -- -- 30 -- -- IRON, TOTAL RECOV- ERABLE (UG/L AS FE) 6800 -- -- 2400 -- -- LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) 6 -- -- 4 -- — MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) 550 -- -- 230 -- -- MERCURY TOTAL RECOV- ERABLE (UG/L AS HG) 0.10 __ — <0.10 -- — SELE- NIUM, TOTAL (UG/L AS SB) 1 -- __ <1 -- -- SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) <1 -- -- 1 -- -- ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) 100 -- -- <100 -- -- CYANIDE TOTAL PHENOLS (MG/L TOTAL AS CN) (UG/L) <0.010 2 __ __ <0.010 1 -- __ METHY- LBNB BLUE ACTIVE SUB- STANCE (MG/L) 0.11 -- -- 0.07 -- -- RIO GRANDB DB LOIZA BASIN 245 50055390 RIO BAIROA AT BAIROA, PR LOCATION.--Lat 18°15'32", long 66°02'24", Hydrologic Unit 21010005, on left bank, in the Bairoa Housing Area, 1.6 mi (2.6 km) northwest of Plaza de Caguas, 4.1 mi (6.6 km) east of Plaza de Aguas Buenas, and 0.9 mi (1.4 km) northwest of Bscuela Pepita Garriga. DRAINAGE AREA.--5.08 mi» (13.15 km'). WATER-DISCHARGE RECORDS PERIOD OP RECORD.--November 1990 to current year. GAGE.—Water-stage recorder and crest-stage gage. Elevation of gage is 131 ft (40 m), from topographic map. REMARKS.--Records poor. Gage-height and precipitation satellite telemetry at station. Mean daily discharge affected by domestic discharge from nearby station. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY OCT NOV DEC JAN MAR APR MAY JUN JUL AUG SEP 1 e3.7 4.4 2 ell 4.3 3 e!4 4.3 4 e7 . 4 4.3 5 5.3 4.3 6 5.1 4.3 7 7.6 4.5 8 5.3 4.6 9 4.9 5.0 10 4.9 4.7 11 4.9 5.1 12 5.9 4.7 13 5.4 4.9 14 5.5 7.1 15 5.5 8.0 16 16 13 17 6.5 8.3 .6 5.4 .6 6.0 .5 5.7 .5 5.4 .6 5.7 .5 5.5 .4 5.5 .4 5.5 .4 5.7 .4 5.6 .5 6.1 .5 5.9 .5 6.2 .5 6.7 .6 6.5 .6 6.6 .6 6.9 18 5.0 11 5.5 6.2 19 .8 7.0 5.4 6.1 20 .6 7.1 4.8 8.2 21 .6 5.7 7.2 6.9 22 ,9 5.2 6.8 6.2 23 .5 5.0 5.0 5.6 24 .3 5.0 5.0 5.4 25 .2 5.1 4.7 5.0 26 .2 5.3 4.5 .7 27 .2 4.9 6.8 .3 28 .3 4.8 6.1 .8 4.1 3.8 3.7 3.8 3.2 3.0 2.9 3.3 3.9 3.8 3.8 3.7 3.6 3.6 3.4 3.3 3.3 3.1 3.0 3.6 3.0 3.1 3.0 3.2 3.2 3.3 4.1 3.1 29 .4 4.8 5.5 .0 30 .3 4.8 5.5 .2 31 .2 --- 5.3 .0 TOTAL 181.4 171.5 154.8 177.5 MEAN 5.85 5.72 4 99 5.73 MAX 16 13 7.2 8.2 MIN 3.7 4.3 4.4 4.0 MBD 4.9 4.9 4.6 5.7 AC-PT 360 340 307 352 CPSM 1.15 1.13 IN. 1.33 1.26 1 98 1.13 13 1.30 95.9 3.42 4.1 2.9 3.3 190 .67 .70 STATISTICS OP MONTHLY MEAN DATA POR WATER YEARS 1991 MEAN 10.8 11.2 9 90 8.81 MAX 25.3 22.2 19.7 13.6 (WY) 1991 1993 1993 1992 MIN 4.30 5.72 4 63 5.73 (WY) 1992 1994 1992 1994 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN-DAY MINIMUM INSTANTANEOUS PEAK PLOW INSTANTANEOUS PEAK STAGE ANNUAL RUNOPP (AC-PT) ANNUAL RUNOPP (CPSM) ANNUAL RUNOPP (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 4.99 8.60 1991 3.42 1994 3.1 3.2 2.9 2.8 2.8 2.8 2.8 2.8 2.9 3.0 2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.8 3.0 3.0 2.8 2.8 2.8 2.8 2.8 2.9 3.0 3.1 3.2 3.2 88.9 2.87 3.2 2.7 2.8 176 .56 .65 - 1994 3.81 5.18 1991 2.87 1994 POR 1993 CALENDAR YEAR 2765.0 7.58 112 2.7 2.9 5480 1.49 20.25 12 5.7 3.6 Sep 18 Apr 3 Apr 1 3.2 3.2 3.2 3.2 3.5 3.2 2.6 2.7 2.3 2.6 3.6 4.9 2.9 3.3 4.3 3.2 2.7 2.5 2.4 2.4 2.3 2.2 2.3 2.2 2.2 2.3 5.0 3.2 2.5 2.5 --- 88.6 2.95 5.0 2.2 2.7 176 .58 .65 , BY WATER 4.13 7.20 1993 2.61 1992 2.5 2.5 2.5 2.5 2.7 2.6 2.5 2.3 2.6 3.7 3.0 2.8 2.7 2.6 2.4 2.2 2.6 2.9 3.0 3.0 3.0 2.9 2.8 3.2 2.9 3.2 3.4 4.0 3.7 4.0 3.5 90.2 2.91 4.0 2.2 2.8 179 .57 .66 YEAR (WY) 6.91 12.5 1993 2.91 1994 3.8 3.9 4.3 3.9 3.9 6.6 4.0 4.1 3.6 3.3 3.5 3.6 3.3 2.9 4.8 4.8 7.0 4.3 3.3 3.6 4.0 3.3 3.1 3.0 3.3 9.8 3.9 4.1 3.6 5.6 --- 126.2 4.21 9.8 2.9 3.9 250 .83 .92 5.50 8.64 1993 4.21 1994 POR 1994 WATER YEAR 1648.5 4.52 33 2.2 2.3 123 6.79 3270 .89 12.07 6.3 4.0 2.7 Sep 20 Apr 22 Apr 20 Sep 30 Sep 30 4.2 3.7 4.0 3.9 4.2 6.9 4.5 3.8 3.7 3.5 3.6 3.7 3.6 3.5 3.6 3.8 3.7 17 4.7 4.0 3.7 3.8 3.8 3.7 3.7 3.6 3.8 3.8 3.8 3.6 3.9 134.8 4.35 17 3.5 3.8 267 .86 .99 9.29 16.5 1991 4.35 1994 WATER 7 10 4 337 2 2 1580 12 5390 1 19 10 4 2 4.0 3.8 3.5 3.6 3.3 3.3 3.3 4.2 4.2 4.9 5.1 4.6 4.4 5.3 4.6 4.6 4.4 6.8 5.3 5.2 4.4 4.4 4.6 25 13 6.6 5.4 5.2 5.0 4.1 3.8 169.9 5.48 25 3.3 4.6 337 1.08 1.24 6.12 7.64 1992 4.09 1991 YEARS 1991 - .45 .3 .52 Dec 26 . 1 Apr 29 .2 Apr 24 Jan 5 .32 Jan 5 .47 .91 .5 .9 4.5 4.1 3.9 3.7 2.9 8.3 4.1 3.5 4.3 6.1 6.1 4.3 3.1 3.3 4.3 3.9 4.1 3.4 8.1 33 8.9 4.6 5.2 4.2 3.1 2.9 2.8 2.6 2.5 13 --- 168.8 5.63 33 2.5 4.1 335 1.11 1.24 7.64 10.6 1993 4.50 1991 1994 1993 1994 1992 1992 1992 1992 1992 e Estimated 246 RIO GRANDE DB LOIZA BASIN 50055390 RIO BAIROA AT BAIROA, PR—Continued WATER-QUALITY RECORDS PERIOD OF RECORD.-- Water year* 1991 to currant year. PERIOD OF DAILY RECORD.-- SUSPENDED-SEDIMENT DISCHARGE: November 1990 to September 1994. INSTRUMENTATION.-- DH-48 and automatic cediment sampler. REMARKS.— Sediment sample* were collected by a local observer on a weekly basis and during high flow event*. EXTREMES FOR PERIOD OF DAILY RECORD.— SEDIMENT CONCENTRATIONI Maximum daily mean, 4,310 mg/L Dec. 26, 1992; Minimum daily mean, 1 mg/L Several day*. SEDIMENT LOADS! Maximum daily mean, 3,910 ton* (3,550 tonnes) Dec. 26, 1992; Minimum daily mean, <0.0 ton (<0.1 tonne) Several day*. EXTREMES FOR WATER YEARS 1994.— SEDIMENT CONCENTRATIONI Maximum daily mean, 278 mg/L Sep. 20, 1994; Minimum daily mean, 1 mg/L Several day*. SEDIMENT LOADS: Maximum daily mean, 53 ton* (46 tonnes) Sep. 20, 1994; Minimum daily mean, <0.01 ton (<0.1 tonne) Several day*. SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) OCTOBER MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MQ/L) (TONS/DAY) NOVEMBER MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) DECEMBER 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL e3 el] el< el j j 1 j 4 4 4 i i i i 1< < i .7 L r.4 ..3 1.1 r.6 i.3 .9 1.9 1.9 i.9 5.4 5.5 5.5 i 5.5 5.0 .8 .6 .6 .9 .5 .3 .2 .2 .2 .3 .4 .3 .2 8 77 85 132 103 88 68 29 14 11 11 10 9 8 10 120 142 95 72 51 28 15 5 3 4 5 6 6 6 6 7 e.08 e5.8 e6.0 e2.9 1.5 1.2 1.6 .42 .18 .15 .14 .17 .13 .13 .14 17 2.6 1.3 .93 .64 .36 .21 .07 .04 .05 .06 .06 .07 .07 .07 .08 4.4 4.3 4.3 4.3 4.3 4.3 4.5 4.6 5.0 4.7 5.1 4.7 4.9 7.1 8.0 13 8.3 11 7.0 7.1 5.7 5.2 5.0 5.0 5.1 5.3 4.9 4.8 4.8 4.8 8 7 6 5 5 5 5 5 6 8 15 11 6 21 31 54 149 41 19 88 94 80 69 60 49 25 11 11 11 11 .11 .09 .07 .06 .06 .06 .06 .06 .08 .09 .21 .14 .09 .46 .80 2.4 6.2 1.7 .39 2.4 1.5 1.1 .93 .80 .69 .35 .14 .14 .14 .14 181.4 44.15 171.5 21.46 .6 .6 .5 .5 .6 .5 .4 .4 .4 .4 .5 .5 .5 .5 .6 .6 .6 5.5 5.4 4.8 7.2 6.8 5.0 5.0 4.7 4.5 6.8 6.1 5.5 5.5 5.3 154.8 11 26 51 70 62 45 33 19 9 10 10 10 10 9 7 6 7 12 16 11 24 18 3 3 3 4 20 15 13 11 9 .15 .33 .62 .84 .76 .54 .39 .22 .10 .11 .12 .12 .12 .11 .09 .08 .09 .20 .33 .14 .83 .54 .05 .04 .04 .04 .52 .24 .19 .16 .12 8.23 e Estimated RIO GRANDS DB LOIZA BASIN 247 50055390 RIO BAIROA AT BAIROA, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN MEAN MEAN MEAN CONCBN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCRN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MO/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) JANUARY 1 2 3 4 5 « 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 5.4 6.0 5.7 5.4 5.7 5.5 5.5 5.5 5.7 5.6 6.1 5.9 6.2 6.7 6.5 «.« 6.9 6.2 6.1 8.2 6.9 6.2 5.6 5.4 5.0 .7 .3 .8 .0 .2 .0 « 15 14 13 12 12 12 12 19 29 40 51 44 26 11 17 12 7 3 18 16 5 4 15 34 45 31 28 82 26 9 .09 .27 .22 .19 .17 .18 .18 .17 .29 .43 .67 .82 .72 .45 .18 .35 .23 .12 .06 .52 .32 .07 .07 .21 .46 .57 .36 .44 1.2 .30 .09 FEBRUARY 4.1 3.8 3.7 3.8 3.2 3.0 2.9 3.3 3.9 3.8 3.8 3.7 3.6 • 3.6 3.4 3.3 3.3 3.1 3.0 3.6 3.0 3.1 3.0 3.2 3.2 3.3 4.1 3.1 ___ —— 4 30 12 16 16 14 12 10 9 7 5 3 « 9 12 7 5 3 2 4 3 4 9 5 « 7 17 « —— .04 .30 .12 .18 .14 .13 .10 .10 .09 .07 .05 .02 .05 .09 .11 .07 .05 .03 .01 .06 .04 .02 .07 .04 .06 .06 .33 .05 —— —— MARCH 3.1 3.2 2.9 2.8 2.8 2.8 2.8 2.8 2.9 3.0 2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.8 3.0 3.0 2.8 2.8 2.8 2.8 2.8 2.9 3.0 3.1 3.2 3.2 « 5 7 10 11 11 9 7 « 8 4 5 5 6 7 7 8 8 9 5 3 4 4 « « 5 5 4 4 5 7 .04 .04 .06 .07 .09 .08 .07 .05 .04 .07 .03 .04 .04 .05 .06 .06 .06 .06 .07 .05 .02 .03 .03 .04 .04 .04 .04 .04 .02 .05 .07 TOTAL 177.5 10.40 95.9 2.48 88.9 1.55 248 RIO ORANDB DB LOIZA BASIN 50055390 RIO BAIROA AT BAIROA, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CPS) (MO/L) (TONS/DAY) (CPS) (MG/L) (TONS/DAY) (CPS) (HG/L) (TONS/DAY) 1 2 3 4 5 6 7 6 9 10 11 12 13 14 15 16 17 16 19 20 21 22 23 24 25 26 27 26 29 30 31 3.2 3.2 3.2 3.2 3.5 3.2 2.6 2.7 2.3 2.6 3.6 4.9 2.9 3.3 4.3 3.2 2.7 2.5 2.4 2.4 2.3 2.2 2.3 2.2 2.2 2.3 5.0 3.2 2.5 2.5 APRIL 11 13 13 13 19 16 15 15 16 15 24 23 6 6 16 10 6 7 6 4 4 3 4 3 3 3 12 9 4 2 MAY .09 .11 .12 .12 .19 .15 .10 .12 .10 .11 .25 .34 .04 .10 .40 .10 .07 .05 .04 .02 .02 .01 .02 .02 .02 .02 .50 .09 .03 .02 2.5 2.5 2.5 2.5 2.7 2.6 2.5 2.3 2.6 3.7 3.0 2.6 2.7 2.6 2.4 2.2 2.6 2.9 3.0 3.0 3.0 2.9 2.6 3.2 2.9 3.2 3.4 4.0 3.7 4.0 3.5 2 2 3 3 2 2 1 1 3 17 4 4 5 5 5 5 4 4 4 4 2 3 2 2 1 1 1 1 2 4 4 .02 .02 .02 .02 <.01 .01 <.01 <.01 .02 .40 .04 .03 .04 .04 .04 .03 .03 .03 .04 .03 .02 .02 .01 .01 .01 <.01 <.01 <.01 .02 .02 .04 JUNE 3.8 3.9 4.3 3.9 3.9 6.6 4.0 4.1 3.6 3.3 3.5 3.6 3.3 2.9 4.6 4.6 7.0 4.3 3.3 3.6 4.0 3.3 3.1 3.0 3.3 9.6 3.9 4.1 3.6 5.6 3 11 6 4 3 24 7 4 3 3 2 2 2 1 5 1 26 4 2 1 1 1 1 1 1 56 9 12 10 20 ___ .02 .11 .06 .04 .02 1.3 .06 .06 .03 <.01 <.01 <. 01 .02 <. 01 .06 •c.Ol .91 .05 .02 •c.Ol .01 .01 .01 .01 .01 6.6 .09 .22 .11 .57 TOTAL 66.6 3.37 90.2 1.01 126.2 10.41 RIO GRANDB DB LOIZA BASIN 249 50055390 RIO BAIROA AT BAIROA, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAT), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CPS) (MG/L) (TONS/DAY) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL YEAR 4.2 3.7 4.0 3.9 4.2 6.9 4.5 3.8 3.7 3.5 3.6 3.7 3.6 3.5 3.6 3.8 3.7 17 4.7 4.0 3.7 3.8 3.8 3.7 3.7 3.6 3.8 3.8 3.8 3.6 3.9 134.8 1648.5 JULY 8 3 2 2 2 122 11 10 9 8 5 3 1 3 8 10 8 109 8 4 5 5 6 6 5 4 3 3 3 3 2 —— MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CPS) (MG/L) (TONS/DAY) AUGUST .11 .02 .02 .02 .02 3.2 .14 .10 .10 .06 .05 .03 .01 .03 .08 .11 .08 15 .11 .05 .04 .04 .05 .06 .05 .04 .02 .02 .04 .02 •c.Ol 19.72 274.54 4.0 3.8 3.5 3.6 3.3 3.3 3.3 4.2 4.2 4.9 5.1 4.6 4.4 5.3 4.6 4.6 4.4 6.8 5.3 5.2 4.4 4.4 4.6 25 13 6.6 5.4 5.2 5.0 4.1 3.8 169.9 2 2 2 3 4 5 4 3 2 6 10 9 8 13 7 4 3 18 12 8 4 4 3 203 187 120 75 56 53 49 44 —— <.01 .02 .02 .03 .04 .04 .04 .02 .02 .13 .14 .10 .09 .31 .09 .06 .02 .53 .17 .12 .04 .05 .03 42 8.4 2.2 1.1 .78 .72 .56 .46 58.33 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CPS) (MG/L) (TONS/DAY) SEPTEMBER 4.5 4.1 3.9 3.7 2.9 8.3 4.1 3.5 4.3 6.1 6.1 4.3 3.1 3.3 4.3 3.9 4.1 3.4 8.1 33 8.9 4.6 5.2 4.2 3.1 2.9 2.8 2.6 2.5 13___ 168.8 31 14 4 6 5 39 10 14 21 31 14 10 8 3 8 7 39 6 60 278 51 11 15 17 10 10 9 7 6 99 —— .38 .17 .04 .07 .02 3.5 .12 .13 .24 .62 .29 .09 .07 .02 .13 .09 .71 .05 8.1 53 3.6 .14 .31 .23 .09 .07 .06 .05 .04 21 93.43 RIO GRANDE DB LOIZA BASIN 50055390 RIO BAIROA AT BAZROA, PR- -Continued WATER QOALITY DATA, MATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT DIS- CHARGE, INST. CUBIC FEET PER SECOND SEDI- MENT, SUS- PENDED (MO/L) SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) SBD. SUSP. FALL DIAM. PERCENT FINER THAN .002 MM SED. SUSP. FALL DIAM. PERCENT FINER THAN .004 MM SED. SUSP. FALL DIAM. PERCENT FINER THAN .008 MM DATE TIME OCT 1993 02... 1650 4.3 5470 64 33 42 64 SED. SUSP. FALL DIAM. PERCENT FINER THAN .016 MM SBD. SUSP. FALL DIAM. PERCENT FINER THAN .031 MM SBD. SUSP. SIEVE DIAM. PERCENT FINER THAN .062 MM SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .125 MM SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .250 MM SBD. SUSP. SIEVE DIAM. PERCENT FINER THAN .500 MM SED. SUSP. SIEVE DIAM. PERCENT FINER THAN 1.00 MM DATE OCT 1993 02... 77 86 96 99 99.5 99.8 99.9 RIO ORANDB OB LOIZA BASIN 50055390 RIO BAIROA AT BAIROA, PR—Continued WATER QUALITY DATA, HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 SILT AND CLAY PERCENT OF SUSPENDED SEDIMENT 251 DATE NOV 1993 20... SEP 1994 17... 21... TIME 1658 1345 1711 STREAM- FLOW, INSTAN- TANEOUS (CFS) SEDI- MENT, SUS- PENDED (MO/L) SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .062 MM 11 11 8.5 569 467 106 17 14 2.4 99 47 92 252 RIO GRANDE DE LOIZA BASIN 50055400 RIO BAIROA NEAR CAGUAS, PR HATER-QUALITY RECORDS LOCATION.--Lat 18°15'28", long 66°02'13", at bridge on Highway 1, about 2.5 mi (4.0 km) upstream from Rio Grande de Loiza, and 1.4 mi (2.3 km) north of Caguas plaza. DRAINAGE AREA.--5.4 mi 1 (14.0 km'). PERIOD OF RECORD.--Hater years 1958, 1962-66, 1973-74, 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE OCT 1993 08. .. DEC 07. .. FEB 1994 17. .. APR 05. .. JUN 17. .. ADO 05. .. DATE OCT 1993 08. . . DEC 07. .. FEB 1994 17. .. APR 05. . . JUN 17. .. ADO 05. .. DATE OCT 1993 08. .. DEC 07. .. FEB 1994 17. .. APR 05. .. JUN 17. .. AU6 05. .. TIME 1145 1210 1130 1030 0950 0850 HARD- NESS TOTAL (MG/L AS CACO3 ) 140 -- -- -- — 160 SILICA, DIS- SOLVED (MQ/L AS SIO2) 29 -- -- -- -- 31 DIS- CHARGE, INST. CUBIC FEET PER SECOND 2.7 3.0 3.5 2.8 2.8 1.3 CALCIUM DIS- SOLVED (MG/L AS CA) 34 -- -- -- -- 38 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 218 -- -- -- -- 255 SPE- CIFIC CON- DUCT- ANCE (US/CM) 350 425 430 432 352 442 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 13 -- -- -- -- 15 SOLIDS, DIS- SOLVED (TONS PER DAY) 1.59 -- -- -- -- 0.88 PH HATER WHOLE FIELD (STAND- ARD UNITS) 7.7 7.6 8.3 7.4 7.0 7.0 SODIUM, DIS- SOLVED (MG/L AS MA) 19 -- -- -- -- 26 RESIDUE TOTAL AT 105 DBG. C, SUS- PENDED (MG/L) 14 59 31 12 2 3 TEMPER- ATURE HATER (DBG C) 29.0 29.5 25.0 27.0 27.5 27.0 SODIUM AD- SORP- TION RATIO 0.7 — _- — -- 0.9 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.30 12 0.30 2.4 0.30 0.40 TUR- BID- ITY (NTU) 1.8 40 1.0 -- 1.0 0.40 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 4.3 -- -- -- -- 3.7 PHOS- PHORUS TOTAL (MG/L AS P) 0.250 2.00 0.470 0.640 0.330 0.250 OXYGEN, DIS- SOLVED (MG/L) 5.5 5.0 9.6 4.0 2.0 0.4 ALKA- LINITY HAT WH TOT PET FIELD MG/L AS CACO3 130 150 150 150 120 140 ARSENIC TOTAL (UG/L AS AS) 2 -- -- <1 -- -- OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 100 65 114 49 25 5 SULFIDE TOTAL (MG/L AS S) <0.5 -- -- -- -- "" BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 -- -- <100 -- -- OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 10 43 <10 _- 14 <10 SULFATE DIS- SOLVED (MG/L AS SO4) 15 -- -- -- -- 15 BORON, TOTAL RECOV- ERABLE (UG/L AS B) 30 -- -- 20 -- -- COLI- FORM, FECAL, 0.45 UM-MF (COLS./ 100 ML) 41000 8900 7700 33000 K14000 27000 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 26 -- -- -- -- 42 CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- <1 -- -- STREP- TOCOCCI FECAL, (COLS. PER 100 ML) 9500 8200 960 19000 K17000 8000 FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.20 -- -- -- -- 0.20 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) <1 -- -- <1 -- -- K = non-ideal count RIO GRANDB DB LOIZA BASIN 50055400 RIO BAIROA NEAR CAGOAS, PR—Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 253 COPPER, IRON, DATE OCT 1993 08. .. DEC 07. .. PBB 1994 17. .. APR 05. .. JUN 17... ADG 05. .. TOTAL RECOV- ERABLE (DG/L AS CU) TOTAL RECOV- ERABLE (DG/L AS FB) 430 260 LEAD, TOTAL RECOV- ERABLE (DG/L AS PB) NBSB, MERCURY TOTAL RECOV- ERABLE (DG/L AS MN) 60 30 TOTAL RECOV- ERABLE (DG/L AS HG) <0.10 <0.10 SELE- NIUM, TOTAL (DG/L AS SB) SILVER, ZINC, TOTAL RECOV- ERABLE (DG/L AS AG) TOTAL RECOV- ERABLE (DG/L AS ZN) LBNB BLDB CYANIDE ACTIVE TOTAL PHENOLS S0B- (MG/L TOTAL STANCE AS CN) (DG/L) (MG/L) 20 <0.010 2 0.04 10 <0.010 3 0.06 254 RIO GRANDE DE LOIZA BASIN 50055750 RIO GURABO BELOW EL MANGO, PR LOCATION.--Lat 18°14'02", long 65°53'07", Hydrologic Unit 21010005, on left bank, 2.43 mi (3.91 km) northeast of Plaza de Juncos, 1.3 mi (2.1 km) southeast of Escuela La Placita and 0.35 ml (0.56 km ) southwest of El Mango. DRAINAGE AREA.--22.3 mi> (57.8 km'). HATER-DISCHARGE RECORDS PERIOD OP RECORD.--March 1990 to current year. GAGE.--Hater-stage recorder. Elevation of gage is 230 ft (70 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. Gage-height and precipitation satellite telemetry at station. Low-flow is affected by sewage discharges from a water treatment plant, 0.60 mi (0.96m) upstream from gaging station since 1990. DISCHARGE, CUBIC FEET PER SECOND, HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY OCT NOV DEC JAN PEB MAR APR JUL AUG SEP 1 e37 8.0 2 e22 7.6 3 e!6 7.1 4 e!5 6.7 5 e!2 6.6 6 e22 6.6 7 e24 6.2 8 e!9 6.5 9 e!2 11 10 elO 13 11 e!3 9.3 12 e!4 7.6 13 elO 6.6 14 e8.4 24 15 7.9 141 16 8.3 769 17 17 103 18 17 384 19 11 224 20 18 56 21 17 39 22 21 23 23 30 18 24 19 20 25 13 19 26 25 85 27 13 34 28 41 22 29 17 18 30 11 34 31 9.3 --- TOTAL 529.9 2115.8 MEAN 17.1 70.5 MAX 41 769 MIN 7.9 6.2 AC-PT 1050 4200 CPSM .77 3.16 IN. .88 3.53 STATISTICS OP MONTHLY MEAN MEAN 52.7 79.2 MAX 161 109 (HY) 1991 1992 MIN 4.01 35.5 (HY) 1993 1991 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN-DAY MINIMUM INSTANTANEOUS PEAK PLOW INSTANTANEOUS PEAK STAGE ANNUAL RUNOFF (AC-PT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 21 16 14 13 17 15 13 12 11 11 10 9.5 9.8 12 14 10 9.3 10 10 16 12 10 9.3 8.9 8.8 8.4 8.0 22 13 10 9.3 373.3 12.0 22 8.0 740 .54 .62 DATA 35.2 59.0 1991 12.0 1994 FOR 10 18 12 10 9.6 8.1 7.5 7.3 8.0 8.0 16 21 15 20 11 10 9.7 e!4 ell e9.0 ell ell elO e8.2 e8.2 elO e8.0 e7.0 e20 e!6 e9.8 354.4 11.4 21 7.0 703 .51 .59 FOR HATER 36.4 65.8 1992 11.4 1994 e9.7 e8.2 elO 9.2 12 8.9 8.0 7.8 7.5 7.3 7.4 7.2 7.1 7.5 11 8.5 7.6 8.4 22 339 57 37 33 32 20 29 29 15_-_ ___ --- 766.3 27.4 339 7.1 1520 1.23 1.28 YEARS 1990 23.6 44.0 1991 10.4 1993 e47 e56 21 15 15 30 26 14 29 28 19 21 16 12 10 9.4 9.2 8.5 8.3 7.9 7.9 7.7 6.9 7.5 6.9 14 8.2 7.6 7.6 9.1 9.0 494.7 16.0 56 6.9 981 .72 .83 - 1994 12.3 18.1 1991 5.63 1993 1993 CALENDAR YEAR 13881. 38. 1710 1. 2. 27530 1. 23. 56 11 5. 6 0 Jul 11 3 May 22 2 May 17 71 16 0 7.1 6.5 6.2 5.8 5.7 5.7 7.8 11 7.1 6.0 31 24 10 7.7 13 23 9.9 13 8.3 6.5 5.7 5.1 4.9 5.0 4.9 4.5 4.6 25 10 6.8 291.8 9.73 31 4.5 579 .44 .49 5.6 5.1 4.6 5.7 6.8 15 8.9 32 72 197 42 17 17 14 16 64 88 13 10 7.9 6.6 6.2 5.8 4.9 4.7 4.6 4.2 3.7 3.4 3.4 3.7 692.8 22.3 197 3.4 1370 1.00 1.16 4.0 3.8 63 19 6.4 119 9.2 4.6 4.5 4.2 8.6 12 5.2 4.5 9.9 14 73 24 8.9 6.2 4.7 4.4 4.6 4.4 4.2 5.4 6.3 4.2 4.5 22 --- 468.7 15.6 119 3.8 930 .70 .78 13 5.6 4.6 4.2 3.8 3.8 8.4 6.8 4.5 4.0 3.8 3.3 3.5 3.8 4.2 4.2 5.0 26 16 8.8 7.1 6.1 5.4 5.3 5.3 5.3 5.3 5.3 6.4 9.1 11 208.9 6.74 26 3.3 414 .30 .35 14 11 8.5 6.5 6.2 6.2 5.8 8.5 7.6 9.0 19 10 7.3 6.2 5.8 5.4 5.3 5.8 40 11 7.4 5.7 5.6 21 41 10 8.2 28 27 9.8 7.1 369.9 11.9 41 5.3 734 .54 .62 5.8 13 20 15 7.0 32 28 14 11 12 26 11 8.9 7.6 9.7 18 21 11 49 839 73 28 20 20 16 15 14 12 11 9.8 --- 1377.8 45.9 839 5.8 2730 2.06 2.30 , BY HATER YEAR (WY) 9.39 11.0 1993 7.52 1990 FOR 1994 8044. 22. 839 3. 3. 4030 16. 15960 . 13. 30 10 4. 37.5 123 1992 4.83 1990 WATER YEAR 3 0 Sep 20 3 Jul 12 7 May 27 Nov 16 10 Nov 16 99 42 9 50.2 117 1992 14.7 1991 45.1 147 1993 6.74 1994 WATER 39 52 22 1710 1 1 5870 17 28680 1 24 72 11 4 24.9 35.2 1990 10.2 1993 YEARS 1990 .6 .3 .0 Jul .1 Oct .4 Oct Nov .38 Nov .78 .12 .1 49.3 81.9 1992 34.9 1990 - 1994 1992 1994 11 1993 27 1992 22 1992 8 1991 8 1991 e Estimated RIO GRANDS DE LOIZA BASIN 50055750 RIO GDRABO BELOW EL MANGO, PR--Continued HATER-QUALITY RECORDS PERIOD OF RECORD.-- Hater years 1985 to 1986 and water year 1989 to current year. PERIOD OF DAILY RECORD.-- SUSPENDED-SEDIMENT DISCHARGE« March 1990 to September 1994. INSTRUMENTATION.-- DH-48 and automatic sediment sampler. REMARKS.-- Sediment samples were collected by a local observer on a weekly basis and during high flow evevnts. EXTREMES FOR PERIOD OF DAILY RECORD.-- SEDIMENT CONCENTRATION< Maximum daily mean, 1,000 mg/L Oct. 21, 1990; Minimum daily mean, 4 mg/L April 7,1991. SEDIMENT LOADS« Maximum daily mean, 7,110 tons (6,450 tonnes) Nov. 08, 1991; Minimum daily mean, 0.05 ton (0.3 tonne) several days. EXTREMES FOR HATER YEAR 1994.-- SEDIMENT CONCENTRATION< Maximum daily mean, 485 mg/L Sep. 20, 1994; Minimum daily mean, 9 mg/L Apr. 09-10, 1994. SEDIMENT LOADS« Maximum daily mean, 1,790 tons (1,620 tonnes) Nov. 20, 1994; Minimum daily mean, 0.14 ton (0.13 tonne) several days. SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 255 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) OCTOBER MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MO/L) (TONS/DAY) NOVEMBER MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) DECEMBER 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 «37 e22 e!6 elS e!2 «22 •24 e!9 e!2 elO e!3 e!4 elO e8. 7. 8. 17 17 11 18 17 21 30 19 13 25 13 41 17 11 9. 4 9 3 3 114 78 52 48 44 61 67 63 60 60 59 58 56 42 30 30 45 52 40 54 52 61 76 58 46 67 44 89 69 42 37 e!3 e4.7 e2.3 el. 9 el. 5 e3.9 e5.3 e3.4 el. 9 el. 6 «2.1 e2.2 el. 5 el.l .66 .66 2.3 2.7 1.2 2.8 2.8 3.9 7.2 3.2 1.8 5.4 1.6 14 3.6 1.4 .98 8.0 7.6 7.1 6.7 6.6 6.6 6.2 6.5 11 13 9.3 7.6 6.6 24 141 769 103 384 224 56 39 23 18 20 19 85 34 22 18 34 32 30 30 29 27 27 33 42 53 61 71 79 81 80 171 447 160 313 247 109 88 63 42 23 22 125 98 72 56 80 .70 .60 .58 .54 .47 .47 .56 .80 1.5 2.1 1.8 1.6 1.5 5.8 72 1760 54 631 237 19 11 4.0 2.1 1.2 1.1 48 10 4.4 2.9 9.7 TOTAL 529.9 102.60 2115.8 2886.42 21 16 14 13 17 15 13 12 11 11 10 9.5 9.8 12 14 10 9.3 10 10 16 12 10 9.3 8.9 8.8 8.4 8.0 22 13 10 9.3 373.3 61 49 43 36 31 25 20 20 21 22 24 25 27 34 42 26 22 22 22 41 45 38 34 31 29 29 27 60 46 34 21 3.7 2.1 1.6 1.3 1.4 1.0 .71 .61 .64 .68 .66 .64 .70 1.2 1.8 .73 .55 .57 .60 1.8 1.6 1.0 .85 .73 .68 .65 .61 4.1 1.8 .96 .52 36.49 e Estimated 256 DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN DISCHARGE (CFS) 10 18 12 10 9.6 8.1 7.5 7.3 8.0 8.0 16 21 15 20 11 10 9.7 e!4 ell e9.0 ell ell elO e8.2 e8.2 elO e8.0 e7.0 e20 e!6 e9.8 TOTAL 354.4 e Estimated RIO GRANDE DB LOIZA BASIN 50055750 RIO GURABO BELOW EL MANGO, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (HG/L) (TONS/DAY) JANUARY 23 53 43 29 20 22 27 30 30 30 48 61 50 67 63 61 58 47 32 23 21 25 45 68 78 47 87 89 90 75 45 .76 2.5 1.5 .77 .50 .50 .55 .59 .62 .67 2.5 3.6 2.2 3.9 2.0 1.6 1.6 el. 6 e.95 e.56 e.63 e.75 el. 2 el. 5 el. 7 el. 3 el. 9 el. 7 e4.9 e3.2 el. 2 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) FEBRUARY e9.7 e8.2 elO 9.2 12 8.9 8.0 7.8 7.5 7.3 7.4 7.2 7.1 7.5 11 8.5 7.6 8.4 22 339 57 37 33 32 20 29 29 15 29 27 23 19 33 20 20 20 20 20 20 20 19 17 12 12 11 27 56 288 109 79 80 70 34 47 73 49 e.76 e.59 e.61 .49 1.1 .48 .43 .42 .40 .39 .40 .39 .36 .34 .38 .28 .22 .67 5.5 552 27 8.0 8.9 6.7 i.e 5.7 6.6 2.1 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (HG/L) (TONS/DAY) MARCH e47 e56 21 15 15 30 26 14 29 28 19 21 16 12 10 9.4 9.2 8.5 8.3 7.9 7.9 7.7 6.9 7.5 6.9 14 8.2 7.6 7.6 9.1 9.0 70 102 78 56 54 71 69 47 72 68 55 58 53 32 20 19 17 14 12 11 11 10 10 10 10 90 67 59 57 55 51 e8.9 e!5 4.7 2.3 2.3 11 5.9 2.0 6.8 5.3 2.8 3.6 2.4 1.1 .56 .49 .41 .31 .25 .24 .23 .21 .20 .20 .20 4.0 1.6 1.2 1.3 1.3 1.2 49.45 766.3 632.91 494.7 88.00 RIO GRANDB DB LOIZA BASIN 50055750 RIO GORABO BELOW BL MANGO, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAT), WATER TEAR OCTOBER 1993 TO SEPTEMBER 1994 257 DAT 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN DISCHARGE (CPS) 7.1 6.5 6.2 5.8 5.7 5.7 7.8 11 7.1 6.0 31 24 10 7.7 13 23 9.9 13 8.3 6.5 5.7 5.1 4.9 5.0 4.9 4.5 4.6 25 10 6.8 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAT) APRIL 41 38 32 24 19 16 11 22 9 9 58 65 42 33 42 48 18 44 40 40 40 41 42 42 42 42 42 68 56 54 .80 .67 .52 .38 .29 .25 .22 .73 .18 .15 8.6 4.7 1.3 .72 1.4 4.2 .58 1.5 .91 .71 .62 .56 .54 .57 .56 .51 .56 6.3 1.6 1.0 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CPS) (MG/L) (TONS/DAT) MAT 5.6 5.1 4.6 5.7 6.8 15 8.9 32 72 197 42 17 17 14 16 64 88 13 10 7.9 6.6 6.2 5.8 4.9 4.7 4.6 4.2 3.7 3.4 3.4 3.7 52 51 49 47 45 47 34 61 124 270 93 55 52 48 51 78 134 49 33 22 19 20 20 20 20 20 20 30 40 40 40 .80 .71 .62 .73 .85 1.8 .80 12 33 305 15 2.8 2.6 2.0 2.5 79 71 1.8 .91 .49 .33 .33 .31 .27 .26 .25 .23 .29 .39 .36 .39 MEAN DISCHARGE (CPS) MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAT) JUNE 4.0 3.8 63 19 6.4 119 9.2 4.6 4.5 4.2 8.6 12 5.2 4.5 9.9 14 73 24 8.9 6.2 4.7 4.4 4.6 4.4 4.2 5.4 6.3 4.2 4.5 22 25 42 79 54 29 137 34 24 21 49 27 42 24 20 31 45 122 65 34 28 23 21 20 19 18 23 26 12 22 79 .26 .42 46 3.7 .52 169 .91 .33 .24 .60 1.2 1.6 .35 .23 1.5 2.0 47 4.9 .86 .48 .30 .26 .24 .22 .20 .36 .46 .14 .28 7.2 TOTAL 291.8 41.63 692.8 537.82 468.7 291.76 258 RIO GRANDB DE LOIZA BASIN 50055750 RIO GURABO BELOW EL MANGO, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL YEAR 13 5.6 4.6 4.2 3.8 3.8 8.4 6.8 4.5 4.0 3.8 3.3 3.5 3.8 4.2 4.2 5.0 26 16 8.8 7.1 6.1 5.4 5.3 5.3 5.3 5.3 5.3 6.4 9.1 11 208.9 8044.3 JULY 119 55 23 21 20 20 29 12 11 14 17 18 19 20 20 20 20 61 52 35 26 20 18 22 29 35 40 42 47 50 50 —— 4.5 .97 .28 .23 .21 .21 .70 .24 .14 .14 .16 .17 .18 .21 .23 .23 .25 6.4 2.6 .90 .51 .34 .27 .31 .41 .50 .57 .60 .81 1.2 1.4 25.87 6677.07 MEAN MEAN CONCBN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) AUGUST 14 11 8.5 6.5 6.2 6.2 5.8 8.5 7.6 9.0 19 10 7.3 6.2 5.8 5.4 5.3 5.8 40 11 7.4 5.7 5.6 21 41 10 8.2 28 27 9.8 7.1 369.9 50 50 50 50 48 45 42 42 33 35 54 43 42 41 40 40 39 39 86 39 30 26 25 57 89 38 28 59 70 38 30 1.9 1.4 1.1 .89 .80 .76 .68 1.1 .74 .93 2.8 1.2 .82 .70 .64 .59 .56 .62 13 1.2 .61 .41 .37 3.7 15 1.1 .63 11 6.7 1.0 .58 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) SEPTEMBER 73.53 5.8 13 20 15 7.0 32 28 14 11 12 26 11 8.9 7.6 9.7 18 21 11 49 839 73 28 20 20 16 15 14 12 11 9.8 1377.8 33 42 36 41 28 66 70 45 39 36 68 44 40 35 35 53 31 20 51 485 129 52 31 25 21 20 20 20 20 20 .53 1.8 2.5 2.1 .55 9.7 7.0 1.8 1.2 1.3 5.4 1.4 .95 .73 .90 2.5 2.2 .58 36 1790 30 4.1 1.7 1.3 .94 .84 .78 .65 .60 .54 1910.59 RIO GRADES DE LOIZA BASIN ** ** 50055750 RIO ODRABO BELOW EL MANGO, PR—Continued WATER QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT SED. SBD. SED. DIS- SEDI- SUSP. SUSP. SUSP. CHARGE, MBNT, FALL FALL FALL INST. SEDI- DIS- DIAM. DIAM. DIAM. CUBIC MBNT, CHARGE, PERCENT PERCENT PERCENT FEET BUS- BUS- FINER FINER FINER DATE TIME PER FENDED FENDED THAN THAN THAN SECOND (MG/L) (T/DAY) .002 MM .004 MM .006 MM MAY 1994 10... 1545 1140 1720 5290 60 65 74 JUN 06... 0656 119 1160 360 63 66 76 SED. SUSP. FALL DIAM. PERCENT FINER THAN .016 MM SBD. SUSP. FALL DIAM. PERCENT FINER THAN .031 MM SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .062 MM SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .125 MM SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .250 MM SBD. SUSP. SIEVE DIAM. PERCENT FINER THAN .500 MM SED. SUSP. SIEVE DIAM. PERCENT FINER THAN 1.00 MM DATE MAY 1994 10... 61 66 94 96.6 99.6 99.9 100 JUN 06... 62 67 95 99 99.6 99.6 100 260 RIO GRANDB DB LOIZA BASIN 50055750 RIO GURABO BELOW EL MANGO--Continued HATER QUALITY DATA, HATER YEAR OCTOBER 1993 TO SBPTBHBBR 1994 SILT AND CLAY PERCENT OF SUSPENDED SEDIMENT DATE NOV 1993 15... 16... MAY 1994 10... AUG 13... SEP 19.. . 20... TIME 2120 1312 1805 1021 2248 0238 STREAM- FLOW, INSTAN- TANEOUS (CFS) 318 388 453 7.6 456 360 SEDI- MENT, SUS- PENDED (MG/L) 158 213 802 29 315 241 SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) 136 223 981 0.60 388 234 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .062 MM 90 89 98 78 98 97 261 RIO GRANDS 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 mi (0.8 tan) upstream from Quebrada Don Victor, 1.7 mi (2.7 tan) upstream from Rio Gurabo and 1.0 mi (1.6 km) south of Juncos. DRAINAGE AREA.--16.4 mi 1 (42.5 tan 1 ). 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 poor. Minor diversion from public water supply tank, 0.5 mi upstream, during low flow. Gage-height and precipitation satellite telemetry at station. EXTREMES OUTSIDE PERIOD OF RECORD.--Approximate discharges (no stages were recorded) of major floods are as followss Sept. 6, 1960, 37,100 ft'/s (1,050 mVs), Oct. 9, 1970, 18,200 ft'/s (515 mVs) . DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY OCT NOV DEC JAN FBB MAR APR MAY JUN JOL AUG SEP 1 42 12 2 29 12 3 22 12 4 21 12 5 21 11 6 70 11 7 28 11 8 23 14 9 19 16 10 18 20 11 17 13 12 25 11 13 24 12 14 16 14 15 15 17 16 30 324 17 21 42 18 15 292 19 17 182 20 15 259 21 15 88 22 16 36 23 34 28 24 17 32 25 13 31 26 28 91 27 13 35 28 70 25 29 18 22 30 15 106 31 13 --- TOTAL 740 1791 MEAN 23.9 59.7 MAX 70 324 MIN 13 11 AC-FT 1470 3550 CFSM 1.46 3.64 IN. 1.68 4.06 STATISTICS OF MONTHLY MEAN MEAN 76.7 92.3 MAX 293 461 (WY) 1986 1988 MIN 19.9 19.5 (WY) 1993 1990 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN- DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE INSTANTANEOUS LOW FLOW ANNUAL RUNOFF (AC-FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 28 23 20 20 20 20 18 17 18 17 16 16 16 16 15 15 14 19 15 15 16 18 15 15 15 14 15 21 15 14 14 530 17.1 28 14 1050 1.04 1.20 DATA 56.8 550 1988 11.0 1990 FOR 18 16 16 14 18 15 14 14 16 24 16 16 20 36 18 16 16 17 15 15 16 15 13 14 13 18 13 13 15 16 21 517 16.7 36 13 1030 1.02 1.17 14 14 14 15 14 13 12 12 12 11 12 12 11 13 14 11 11 13 66 254 34 21 37 35 32 20 17 17 ___ -__ 761 27.2 254 11 1510 1.66 1.73 FOR WATER YEARS 1971 23.3 77.0 1992 11.4 1976 18.2 47.9 1984 7.21 1974 18 18 16 14 13 13 12 13 18 69 18 78 20 15 13 13 12 12 12 12 11 11 11 11 9.6 29 11 9.1 9.9 10 11 542.6 17.5 78 9.1 1080 1.07 1.23 - 1994 19.4 39.7 1973 7.01 1977 1993 CALENDAR YEAR 13893.1 38.1 1430 7.1 8.0 27560 2.32 31.51 58 19 12 Jul 11 Apr 11 Apr 5 8.5 8.1 8.0 7.7 7.2 7.0 9.1 9.1 4.2 5.8 6.4 6.2 5.0 .6 .6 .4 .2 .2 3.9 3.4 3.2 4.8 3.3 3.2 3.0 2.9 2.6 10 4.1 3.1 --- 161.8 5.39 10 2.6 321 .33 .37 , BY WATER 15.2 41.7 1985 5.39 1994 2.9 2.6 2.8 3.8 3.4 3.6 2.9 3.0 6.2 45 9.3 5.4 12 8.6 5.9 4.7 4.2 3.8 3.5 3.1 3.2 3.1 3.5 3.0 3.0 3.3 3.4 2.4 2.7 2.4 2.7 169.4 5.46 45 2.4 336 .33 .38 YEAR (WY) 52.0 268 1985 5.02 1990 2.6 2.2 1.7 1.7 1.8 8.0 3.3 2.2 2.6 2.7 3.4 2.9 2.4 1.9 5.8 6.5 7.6 5.6 3.3 2.6 2.7 2.4 2.0 1.9 2.4 8.7 5.0 5.6 4.0 43--- 148.5 4.95 43 1.7 295 .30 .34 48.7 188 1979 4.95 1994 FOR 1994 WATER YEAR 7827.4 21.4 1240 1.4 1.7 7150 13.08 15530 1.31 17.75 29 12 2.4 Sep 20 Jul 15 Jul 10 Sep 20 Sep 20 8.4 3.0 3.2 2.5 2.2 2.4 3.9 3.2 2.5 2.2 2.1 1.6 1.5 1.5 1.4 1.4 2.6 66 6.9 2.9 2.4 1.9 1.6 1.4 1.5 1.7 2.4 1.8 1.7 2.3 2.9 143.0 4.61 66 1.4 284 .28 .32 47.1 163 1981 4.61 1994 WATER 49 121 17 9100 1 1 40000 25 1 35590 3 40 71 18 6 3.5 2.1 1.8 1.5 2.6 3.6 2.2 1.8 1.5 6.9 6.6 4.0 3.1 2.7 2.3 2.0 1.5 12 8.8 5.0 3.8 3.6 3.3 5.0 16 5.0 5.6 6.0 14 4.6 3.7 146.1 4.71 16 1.5 290 .29 .33 60.0 231 1979 4.71 1994 YEARS 1971 .1 .1 Dec .4 Jul .7 Jul Dec .63 Dec .4 Apr .00 .70 .9 4.6 32 18 22 8.8 142 45 14 26 17 28 9.9 8.9 8.9 187 88 29 18 24 1240 75 27 17 20 14 13 11 10 9.7 9.2 2177.0 72.6 1240 4.6 4320 4.42 4.94 77.5 255 1979 10.8 1987 - 1994 1988 1990 8 1987 15 1994 10 1994 8 1987 8 1987 21 1988 262 RIO GRANDB DE LOIZA BASIN 50056400 RIO VALENCIANO NEAR JUNCOS, PR—Continued WATER-QUALITY RECORDS PERIOD OF RECORD.— Water years 1983 to 1986 and water year 1989 to current year. PERIOD OF DAILY RECORD.— SUSPENDED-SEDIMENT DISCHARGE« October 1989 to September 1994. INSTRUMENTATION.— Automatic sediment sampler. REMARKS.— Sediment samples were collected by a local observer on a weekly basis and during high flow events. EXTREMES FOR PERIOD OF DAILY RECORD.-- SEDIMENT CONCENTRATION: Maximum daily 1 mg/L several days. an, 1,600 mg/L Oct. 06, 1985; Minimum daily mean, SEDIMENT LOADS< Maximum daily mean, 46,300 tons (42,000 tonnes) May 18, 1985; Minimum daily mean, 0.01 ton (0.01 tonne) several days. EXTREMES FOR WATER YEAR 1994.— SEDIMENT CONCENTRATION: Maximum daily mean, 1050 mg/L Sep. 20, 1994; Minimum daily mean, 2 mg/L several days. SEDIMENT LOADSi Maximum daily mean, 9,710 tons (8,800 tonnes) Nov. 20, 1994; Minimum daily mean, 0.02 ton (0.02 tonne) several days. SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 AY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN DISCHARGE (CFS) 42 29 22 21 21 70 28 23 19 18 17 25 24 16 15 30 21 15 17 15 15 16 34 17 13 28 13 70 18 15 13 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MO/L) (TONS/DAY) OCTOBER MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) NOVEMBER 42 29 22 21 21 70 28 23 19 18 17 25 24 16 15 30 21 15 17 15 15 16 34 17 13 28 13 70 18 15 13 85 62 39 35 35 122 45 37 35 28 16 43 41 27 26 58 35 26 28 28 27 22 55 29 23 45 23 122 31 24 21 10 4.7 2.3 1.9 2.0 38 3.3 2.2 1.8 1.3 .70 3.6 3.2 1.2 1.0 9.2 2.2 1.1 1.2 1.1 1.0 .92 8.3 1.4 .80 4.5 .81 62 1.6 .95 .71 12 12 12 12 11 11 11 14 16 20 13 11 12 14 17 324 42 292 182 259 88 36 28 31 30 93 35 25 22 106 22 19 20 20 29 43 30 24 26 33 23 30 39 32 28 559 67 580 345 505 157 62 43 61 68 176 59 41 37 185 .73 .59 .66 .66 .86 1.3 .89 1.1 1.3 1.9 .82 .89 1.3 1.2 1.3 1760 8.1 1210 233 961 52 6.2 3.3 5.1 5.8 87 5.6 2.8 2.3 104 MEAN DISCHARGE (CFS) 28 23 20 20 20 20 18 17 18 17 16 16 16 16 15 15 14 19 15 15 16 18 15 15 15 14 15 21 15 14 14 MEAN CONCEN- TRATION (MO/L) DECEMBER 69 66 62 63 61 100 104 74 43 31 20 19 21 21 21 22 23 23 24 26 24 20 17 13 10 12 23 33 27 25 22 SEDIMENT DISCHARGE (TONS/ DAY) 5.8 4.1 3.3 3.4 3.3 5.3 4.9 3.3 2.1 1.5 .90 .82 .88 .89 .83 .85 .85 1.2 1.0 1.0 1.0 .99 .66 .48 .39 .44 .96 1.9 1.1 .96 .85 TOTAL 740 174.99 1791 4461.70 530 55.95 RIO GRANDB DB LOIZA BASIN 50056400 RIO VALENCIANO NEAR JUNCOS, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 263 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) JANUARY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 18 16 16 14 18 15 14 14 16 24 16 16 20 36 18 16 16 17 15 15 16 15 13 14 13 18 13 13 15 16 21 26 27 25 24 33 37 45 48 42 41 27 26 33 58 35 38 26 28 24 25 28 25 22 24 22 29 21 22 39 27 35 1.3 1.2 1 .92 1.8 1.5 1.7 1.8 1.8 2.9 1.2 1.2 2.0 6.5 1.6 1.7 1.2 1.3 .94 1 1.3 1 .78 .91 .8 1.5 .71 .8 1.5 1.2 2.2 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MO/L) (TONS/DAY) MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) FEBRUARY 14 14 14 15 14 13 12 12 12 11 12 12 11 13 14 11 11 13 66 254 34 21 37 35 32 20 17 17 23 23 23 42 60 40 20 20 19 18 18 18 20 22 31 34 25 22 111 556 57 35 59 58 54 34 28 28 .86 .86 .86 1.6 2.3 1.4 .64 .64 .59 .54 .55 .55 .59 .79 1.1 .71 .78 35 1020 5.4 2 7.4 6.2 4.9 1.9 1.3 1.3 MARCH 18 18 16 14 13 13 12 13 18 69 18 78 20 15 13 13 12 12 12 12 11 11 11 11 9.6 29 11 9.1 9.9 10 11 30 30 34 39 39 29 20 23 31 126 30 146 34 25 21 20 19 19 20 20 19 20 22 21 21 55 24 22 21 25 19 1.4 1.4 1.4 1.5 1.4 .97 .64 .83 1.6 52 1.5 91 2 .98 .74 .70 .66 .58 .6 .64 .58 .66 .71 .70 .64 5.9 .93 .59 .62 .90 .62 TOTAL 517 47.26 761 1101.76 542.6 175.39 264 RIO ORANDB DB LOIZA BASIN 50056400 RIO VALENCIANO NEAR JUNTOS, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN DISCHARGE (CPS) 8.5 8.1 8.0 7.7 7.2 7.0 9.1 9.1 4.2 5.8 6.4 6.2 5.0 .6 .6 .4 .2 .2 3.9 3.4 3.2 4.8 3.3 3.2 3.0 2.9 2.6 10 4.1 3.1 MEAN CONCEN- TRATION (MG/L) APRIL 14 14 14 13 12 11 15 15 7 9 8 8 7 6 6 6 6 6 6 4 4 7 7 1200 5 4 4 18 6 5 SEDIMENT DISCHARGE (TONS/DAY) .33 .30 .30 .26 .23 .22 .38 .80 .09 .14 .15 .14 .10 .08 .08 .08 .07 .06 .07 .05 .04 .10 .07 11 .04 .03 .03 .89 .08 .04 —— MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) MAY 2.9 2.6 2.8 3.8 3.4 3.6 2.9 3.0 6.2 45 9.3 5.4 12 8.6 5.9 4.7 4.2 3.8 3.5 3.1 3.2 3.1 3.5 3.0 3.0 3.3 3.4 2.4 2.7 2.4 2.7 4 4 4 5 9 10 7 6 10 80 15 8 20 28 40 35 27 21 14 10 11 9 5 5 5 5 15 30 30 25 19 .04 .03 .03 .05 .08 .09 .06 .05 .20 22 .45 .12 .85 .66 .62 .45 .32 .22 .13 .08 .09 .07 .05 .04 .04 .04 .13 .20 .21 .16 .15 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) JUNE 2.6 2.2 1.7 1.7 1.8 8.0 3.3 2.2 2.6 2.7 3.4 2.9 2.4 1.9 5.8 6.5 7.6 5.6 3.3 2.6 2.7 2.4 2.0 1.9 2.4 8.7 5.0 5.6 4.0 43 14 9 6 4 3 312 5 3 6 18 30 14 3 3 10 11 13 9 5 4 3 3 3 4 6 15 9 9 6 128 .10 .06 .02 .02 .02 3.9 .04 .02 .05 .13 .27 .12 .02 .02 .40 .30 .33 .15 .05 .03 .03 .02 .02 .02 .04 .66 .15 .17 .06 52 TOTAL 161.8 16.25 169.4 27.71 148.5 59.22 RIO GRANDB DE LOIZA BASIN 50056400 RIO VALENCIANO NEAR JUNCOS, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 265 DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL YEAR MEAN DISCHARGE (CPS) 8.4 3.0 3.2 2.5 2.2 2.4 3.9 3.2 2.5 2.2 2.1 1.6 1.5 1.5 1.4 1.4 2.6 66 6.9 2.9 2.4 1.9 1.6 1.4 1.5 1.7 2.4 1.8 1.7 2.3 2.9 143.0 7827.4 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MO/L) (TONS/DAY) •JULY 15 6 5 4 4 4 6 5 3 3 3 2 3 3 139 19 14 3 9 12 7 3 3 4 3 3 3 4 .57 .04 .05 .02 .02 .02 .08 .05 .03 .01 .01 .01 .01 .03 68 .38 .12 .02 .05 .05 .03 .01 .01 .03 .02 <.01 .02 .03 69.72 16889.35 MEAN DISCHARGE (CPS) 3.5 2.1 1.8 1.5 2.6 3.6 2.2 1.8 1.5 6.9 6.6 4.0 3.1 2.7 2.3 2.0 1.5 12 8.8 5.0 3.8 3.6 3.3 5.0 16 5.0 5.6 6.0 14 4.6 3.7 146.1 MEAN CONCBN- SEDIMENT TRATION DISCHARGE (MQ/L) (TONS/DAY) AUGUST MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) SEPTEMBER 5 3 4 5 3 6 4 3 3 11 11 6 5 5 5 5 4 20 22 22 16 5 5 9 27 7 8 10 23 6 5 .05 .01 .02 .02 .03 .06 .02 .02 .01 .31 .19 .07 .04 .04 .02 .03 .02 1.3 .55 .30 .17 .05 .05 .18 1.5 .11 .15 .17 1.3 .09 .05 4.6 32 18 22 8.8 142 45 14 26 17 28 9.9 8.9 8.9 187 88 29 18 24 1240 75 27 17 20 14 13 11 10 9.7 9.2 7 59 81 38 15 267 78 24 44 34 47 16 15 15 365 160 58 32 41 1050 131 40 32 36 23 22 18 16 16 16 .09 9.2 5.0 3.9 .38 158 14 .92 4.6 2.6 5.3 .44 .37 .36 669 53 5.0 1.6 5.7 9710 33 2.9 1.5 2.2 .83 .77 .54 .44 .43 .40 6.93 2177.0 10692.47 266 RIO GRANDS DE LOIZA BASIN 50056400 RIO VALENCIANO NEAR OUNCOS, PR--Continued HATER QUALITY DATA, HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT DATE OCT 1993 28... FEB 1994 20... JUN 30... SEP 16. .. 20... 20... DATE OCT 1993 28... FEB 1994 20... JUN 30. .. SEP 1C... 20... 20... TIME 1330 0555 1710 1415 1130 1145 BED. SUSP. FALL DIAM. PERCENT FINER THAN .016 MM 84 81 86 88 62 69 DIS- CHARGE, INST. CUBIC FEET PER SECOND 367 455 218 182 4870 4090 SED. SUSP. FALL DIAM. PERCENT FINER THAN .031 MM 92 85 86 92 77 77 SEDI- MENT, SUS- PENDED (MGt/L) 1160 3360 1610 1170 2590 2040 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .062 MM 98 96 97 99 91 91 SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) 1140 4130 498 156 34000 22500 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .125 MM 99 98 98 99.5 96 96 SED. SUSP. FALL DIAM. PERCENT FINER THAN .002 MM 69 44 71 78 38 44 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .250 MM 99.5 99.5 98.9 99.6 98 97 SED. SUSP. FALL DIAM. PERCENT FINER THAN .004 MM 75 58 78 83 45 52 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .500 MM 99.8 99.7 99.3 99.8 98 98 SED. SUSP. FALL DIAM. PERCENT FINER THAN .008 MM 78 69 84 87 51 58 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN 1.00 MM 99.9 99.9 99.7 99.9 99 99 RIO GRANDB DB LOIZA BASIN 50056400 RIO VALBNCIANO NEAR JUNCOS, PR--Continued WATER QUALITY DATA, WATER TEAR OCTOBER 1993 TO SEPTEMBER 1994 SILT AND CLAY PERCENT OF SUSPENDED SEDIMENT 267 DATE NOV 1993 16... FBB 1994 19... 20... JDN 30... 30... JtJL 18... 18.. . 28... SEP 03... 20... TIME 1336 0615 0615 1048 1750 1142 1312 0932 1145 1230 STREAM- FLOW, INSTAN- TANEOUS (CFS) 125 386 386 6.5 245 210 258 2.0 15 2470 SEDI- MENT, SUS- PENDED SEDI- MENT, DIS- CHARGE, SUS- PENDED (MG/L) (T/DAY) 450 289 1950 72 1090 3540 287 106 112 808 152 289 2030 1.3 722 2000 200 0.6 4.5 5390 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .062 MM 98 97 95 99 98 100 98 61 98 94 268 RIO GRANDB DB LOIZA BASIN 50057000 RIO GORABO 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 mi (0.5 km) east of Gurabo, and 4.5 mi (7.6 km) upstream from Rio Grande de Loiza. DRAINAGE AREA.--60.2 mi 1 (155.9 km1 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.—1958 (occasional low-flow measurements only), January to September 1959 (monthly measurements only), October 1959 to current year. GAGE.—Water-stage recorder and crest-stage gage. Datum of gage is 131.58 ft (40.106 m) above mean sea level. Prior to Oct. 1, 1989 datum 5.0 ft (1.5 m) higher. REMARKS.--Records fair. Gage-height and precipitation satellite telemetry at station. Low flow affected by diversions for water supply about, 400 ft (121m) upstream from station by A.A.A. 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 (8.1 m), datum then is use. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY NOV JAN FBB MAR APR MAY JON 1 139 24 2 75 21 3 64 20 4 49 19 5 42 17 6 73 16 7 114 16 8 76 16 9 54 30 10 42 33 11 36 32 12 44 21 13 48 18 14 35 41 15 26 156 16 37 1050 17 74 181 18 58 532 19 36 399 20 43 207 21 37 179 22 54 78 23 81 60 24 70 61 25 41 55 26 85 148 27 38 93 28 99 60 29 79 49 30 34 98 31 27 --- TOTAL 1810 3730 MEAN 58.4 124 MAX 139 1050 MIN 26 16 AC-FT 3590 7400 CFSM .97 2.07 IN. 1.12 2.30 STATISTICS OF MONTHLY MEAN MEAN 200 206 MAX 1414 1045 (WY) 1971 1988 MIN 16.0 37.3 (WY) 1968 1974 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN- DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE INSTANTANEOUS LOW FLOW ANNUAL RUNOFF (AC-FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 65 42 35 32 35 33 27 23 22 26 19 18 18 18 23 18 16 28 21 22 25 21 17 16 15 14 14 30 25 18 15 751 24.2 65 14 1490 .40 .46 DATA 159 863 1988 10.7 1968 FOR 16 24 22 17 16 19 16 13 13 20 20 36 27 47 25 20 17 22 17 14 18 18 16 13 13 16 13 11 32 26 21 618 19.9 47 11 1230 .33 .38 15 13 14 14 15 12 9.7 8.8 8.5 7.9 7.3 7.4 7.3 7.1 11 9.0 7.1 6.6 25 418 75 88 50 82 46 40 55 26 ___ ___ --- 1085.7 38.8 418 6.6 2150 .64 .67 FOR WATER YEARS 1960 62.1 204 1992 16.4 1968 46.0 131 1989 12.6 1968 78 91 44 25 19 18 47 20 46 69 45 63 44 21 15 13 11 10 9.3 9.4 9.2 8.9 8.4 8.9 8.1 32 19 10 9.4 12 13 836.6 27.0 91 8.1 1660 .45 .52 - 1994 39.5 97.5 1985 11.2 1965 1993 CALENDAR YEAR 35293 96. 6200 14 17 70000 1. 21. 132 42 24 7 Jul 11 Dec 26 Dec 21 61 81 11 9.1 7.9 7.3 6.4 6.8 11 12 12 6.9 21 40 19 11 13 23 12 10 11 10 10 10 13 11 11 12 15 30 33 14 --- 419.4 14.0 40 6.4 832 .23 .26 9.8 10 12 13 11 16 18 15 77 188 127 50 47 51 44 27 139 44 25 20 15 13 12 11 11 13 11 13 15 17 15 1089.8 35.2 188 9.8 2160 .58 .67 19 19 23 72 14 92 43 13 9.6 9.8 8.8 27 14 8.6 8.5 44 57 81 29 16 12 10 9.2 7.9 7.3 12 30 17 20 58 --- 791.7 26.4 92 7.3 1570 .44 .49 94 26 18 13 11 13 14 25 16 15 13 14 11 10 9.0 9.1 11 63 74 27 15 11 11 14 14 15 15 17 11 16 18 643.1 20.7 94 9.0 1280 .34 .40 28 22 17 12 12 12 9.9 7.1 14 12 43 26 16 24 16 13 13 17 104 67 37 27 24 52 65 26 13 15 49 21 12 826.0 26.6 104 7.1 1640 .44 .51 9.7 25 62 47 39 93 124 50 36 38 55 28 18 15 87 83 60 28 25 1870 194 78 49 44 32 25 22 18 16 14 --- 3284.7 109 1870 9.7 6520 1.82 2.03 , BY WATER YEAR (WY) 42.0 93.9 1985 14.0 1994 FOR 1994 15886. 43. 1870 6. 7. 7180 18. 31510 9. 77 20 9. 148 746 1985 12.7 1990 WATER YEAR 0 5 Sep 20 4 Apr 5 8 Feb 8 Sep 20 41 Sep 20 72 82 8 133 468 1970 16.8 1972 122 376 1993 20.7 1994 WATER 131 286 42 21100 4 5 21100 27 4 94580 2 29 207 49 18 168 610 1979 24.8 1967 YEARS 1960 .2 Sep .8 Sep .5 Sep Sep .70 Sep .5 Feb .17 .47 220 1225 1960 8.76 1967 - 1994 1979 1967 6 1960 26 1967 21 1967 6 1960 6 1960 21 1968 RIO ORANDE OB LOIZA BASIN 50057000 RIO GORABO AT GORABO--Continued 269 PERIOD OF RECORD.-- Hater years 1984 to current year. HATER-QUALITY RECORDS PERIOD OF DAILY RECORD.— SUSPENDED-SEDIMENT DISCHARGE: October 1983 to September 1994. INSTRUMENTATION.— USD-49 and automatic sediment sampler. REMARKS.— Sediment samples were collected by a local observer on a weekly basis and during high flow events. EXTREMES FOR PERIOD OF DAILY RECORD.— SEDIMENT CONCENTRATION! Maximum daily mean, 9,220 mg/L Nov 27, 1987; Minimum daily mean, 3 xng/L Aug. 09, 1994. SEDIMENT LOADS: Maximum daily mean, 686,000 tons (622,340 tonnes) Nov 27, 1987; Minimum daily mean, 0.08 ton (0.07 tonne) Aug. 08, 1994. EXTREMES FOR CURRENT YEARS 1993-94.— Hater Year 1993 1994 DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 Suspended-sediment concentration (mg/L) maximum minimum Suspended-sediment discharge (tons per day) maximum minimum 1250 (Apr. 658 (Sep. 29) 4 20) 3 (Aug. 1-4) (Aug. 09) SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY) MEAN DISCHARGE (CFS) 52 45 26 21 20 31 81 44 46 36 37 31 27 29 29 30 40 61 59 71 62 60 50 51 73 55 50 47 66 55 70 MEAN CONCEN- TRATION (MG/L) OCTOBER 42 36 23 21 20 27 64 39 43 93 84 72 61 50 50 32 30 44 48 52 42 40 41 45 54 68 82 94 91 63 61 SEDIMENT DISCHARGE (TONS/DAY) 6.8 4.7 1.7 1.2 1.1 3.1 17 5.4 6.0 9.3 8.1 6.4 4.4 3.7 3.9 2.6 3.2 9.7 8.0 10 7.0 6.6 5.6 6.5 11 10 11 12 16 9.8 13 MEAN DISCHARGE (CFS) 81 61 86 202 136 121 180 88 7€ 177 93 70 92 73 130 167 205 515 271 147 120 173 146 93 85 76 240 985 213 2230 18600 6800 (Jul. 11) (Sep. 20) .64 (May, 20) .08 (Aug. 08) , HATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 MEAN CONCEN- TRATION (MG/L) NOVEMBER 63 47 60 144 102 93 132 69 60 125 65 46 64 42 88 126 152 392 194 107 45 127 107 72 43 49 202 532 155 630 SEDIMENT DISCHARGE (TONS /DAY) 15 7.8 16 85 43 35 73 17 13 64 17 8.9 17 8.7 50 65 93 1140 169 44 16 64 45 18 10 9.9 342 1860 99 5350—— MEAN DISCHARGE (CFS) 226 151 124 154 128 144 112 87 78 71 67 63 60 62 64 60 59 57 55 51 50 52 54 53 72 481 169 85 269 763 379 MEAN CONCEN- TRATION (MG/L) DECEMBER 162 79 67 112 99 103 74 32 16 11 10 10 10 11 13 15 15 13 11 10 10 10 10 31 61 391 123 68 203 485 259 SEDIMENT DISCHARGE (TONS/DAY) 104 34 22 49 36 44 23 7.7 3.4 2.1 1.8 1.6 1.6 1.8 2.2 2.3 2.3 2.0 1.6 1.4 1.3 1.4 1.4 4.7 12 1070 71 16 311 1500 360 TOTAL 1455 224.8 7332 9795.3 4300 3692.6 270 RIO GRANDE DE LOIZA BASIN 50057000 RIO OURABO AT ODRABO--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 MEAN MEAN CONCBN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TOTS/DAY) JANUARY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 184 125 113 106 85 96 134 144 91 85 71 66 60 62 60 54 56 50 46 45 40 43 68 44 44 51 39 69 360 84 58 133 53 31 28 25 27 93 111 47 37 30 24 18 15 15 16 17 17 17 17 17 17 25 11 15 41 34 54 276 55 40 64 18 9.4 8.1 5.9 7.0 42 50 12 8.6 5.9 4.4 2.9 2.5 2.5 2.4 2.6 2.3 2.2 2.0 1.8 2.1 5.2 1.3 2.2 6.1 3.6 10 441 14 6.3 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MO/L) (TONS/DAY) FEBRUARY 46 53 114 58 48 42 39 41 43 40 40 47 54 43 36 35 •35 •35 •36 •33 •33 •34 •32 •32 •32 •33 •32 •32 37 43 87 45 40 36 32 26 20 17 17 19 23 28 32 32 30 30 261 254 244 231 217 201 175 128 1220 38 4.6 8.4 32 7.2 5.1 4.2 3.3 2.8 2.3 1.8 1.8 2.6 3.2 3.2 3.1 3.0 •2.8 •2.8 •25 •23 •22 •21 •19 •17 •15 •11 •109 •3.3 MEAN MEAN CONCBN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MO/L) (TONS/DAY) MARCH •32 •30 •30 •30 •30 •28 •28 •30 •30 •30 •29 •30 •29 •29 •29 •30 •56 •60 •40 •38 •40 •30 •28 •56 •54 •36 •33 •30 •28 •26 •26 28 28 99 165 155 141 121 99 27 46 39 32 25 23 25 26 36 57 80 91 86 77 49 58 62 67 70 71 75 79 82 •2.4 •2.3 •8.1 •13 •13 •11 •9.1 •7.7 •2.2 •3.7 •3.1 •2.5 •2.0 •1.8 •2.0 •2.1 •5.4 •9.1 •8.6 •9.3 •9.3 •6.2 •3.7 •8.7 •9.0 •6.5 •6.2 •5.8 •5.7 •5.5 •5.8 TOTAL 2633 748.3 1178 359.5 1055 190.8 • Estimated RIO GRANDE DE LOIZA BASIN 271 50057000 RIO GDRABO AT GURABO—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCBN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CPS) (MG/L) (TONS/DAY) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 •26 •25 •24 •25 •25 •43 •33 •33 •39 •34 •26 •27 100 91 115 62 48 29 78 60 56 35 39 115 77 39 •25 •70 • 130 •250 ___ APRIL 86 89 88 83 77 69 63 61 61 55 36 19 73 72 104 180 147 104 106 75 80 56 33 84 59 33 23 56 1250 177 MAY •6.0 •6.0 •5.7 •5.6 •5.2 •8.0 •5.6 •5.4 •6.4 •5.1 •2.5 •1.4 49 22 59 31 19 8.8 22 12 12 5.6 3.2 48 14 3.5 •1.6 •11 •438 •119 •450 •400 •26 •34 •23 •21 •21 •240 •60 •40 •27 •50 •76 •40 •27 •29 •25 •25 •27 •25 •25 •25 •30 36 43 70 86 127 48 31 25 310 277 24 30 73 66 55 170 46 33 25 40 61 33 28 22 18 13 10 10 11 14 27 31 35 55 68 120 78 50 24 •377 •299 •1.7 •2.8 •4.5 •3.7 •3.1 •110 •7.5 •3.6 •1.8 •5.4 •13 •3.6 •2.0 •1.7 •1.2 .88 .73 .64 .75 .92 •2.2 3.1 4.1 11 25 47 10 4.3 1.6 JUNE 24 •25 •25 •23 •20 •20 •19 •20 74 121 59 32 36 216 99 64 37 29 2030 991 157 105 80 69 58 51 47 43 31 57 25 25 27 29 33 38 44 49 59 91 52 29 32 155 103 90 90 90 763 507 108 75 57 37 24 25 35 60 80 51 1.6 •1.7 •1.8 •1.9 •1.9 •2.1 •2.3 •2.6 15 33 10 2.6 5.6 104 31 17 9.4 7.1 7010 1980 50 21 13 6.9 3.9 3.5 4.3 6.6 7.3 7.4 TOTAL 1779 941.6 2212 953.82 4662 9364.5 • E«timat*d 272 RIO GRANDE DE LOIZA BASIN 50057000 RIO GURABO AT GDRABO—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 DAY 1 2 3 4 5 6 7 6 9 10 11 12 13 14 15 16 17 16 19 20 21 22 23 24 25 26 27 26 29 30 31 TOTAL YEAR MEAN DISCHARGE (CPS) 46 64 196 93 46 37 46 126 74 41 6200 426 144 117 104 334 106 60 69 67 57 681 1390 335 149 159 165 94 76 67 62 11655 42069 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) JULY 46 64 196 93 46 37 46 126 74 41 6200 426 144 117 104 334 106 60 69 67 57 681 1390 335 149 159 165 94 76 67 62 26 36 131 90 54 37 49 96 67 59 596 303 113 61 62 261 65 21 10 6 6 294 562 151 67 119 112 28 14 10 6 3.7 6.5 76 25 7.6 3.8 7.6 36 15 6.5 18600 464 49 20 51 376 22 4.6 2.0 1.5 .94 1290 2720 164 37 71 66 7.6 2.9 1.9 1.0 24162.34 52406.59 MEAN MEAN CONCBN- SEDIMENT MEAN DISCHARGE TRATION DISCHARGE DISCHARGE (CFS) (MG/L) (TONS/DAY) (CFS) AUGUST 1 57 54 50 46 45 45 40 36 36 36 34 34 30 29 31 57 46 33 29 26 27 58 94 60 60 52 45 37 31 26 34 1366 4 4 4 4 5 6 7 10 10 10 10 10 10 10 9 10 10 11 16 20 20 47 72 64 54 35 43 44 34 23 13 .62 .59 .54 .55 .71 .77 .63 .96 .96 1.0 1.0 .92 .84 .76 .83 1.4 1.3 .99 1.2 1.5 1.5 13 19 15 12 5.1 6.9 4.4 3.0 1.6 1.2 101.19 45 37 37 27 74 88 36 116 125 156 136 46 35 36 30 92 112 136 114 117 63 42 41 46 36 57 40 51 103 376 —— 2462 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) SEPTEMBER 45 37 37 27 74 88 36 lie 125 156 136 46 35 36 30 92 112 136 114 117 63 42 41 46 36 57 40 51 103 376 9 6 9 17 56 71 34 66 96 120 105 47 42 36 29 70 64 111 69 68 65 57 50 43 40 46 33 44 113 405 1.0 .90 .64 1.3 16 22 3.7 71 44 65 62 6.6 4.2 3.2 2.4 21 37 55 38 47 13 6.6 6.0 5.3 4.5 7.5 3.4 6.4 35 1260 1671.64 RIO GRANDE DE LOZZA BASIN 50057000 RIO GORABO AT GORABO--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 273 DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN DISCHARGE (CPS) 139 75 64 49 42 73 114 76 54 42 36 44 48 35 26 37 74 58 36 43 37 54 81 70 41 85 38 99 79 34 27 MEAN CONCEN- TRATION (MG/L) OCTOBER 187 121 66 39 29 26 72 80 66 40 35 39 42 35 48 71 74 75 75 74 58 36 42 59 38 77 60 81 66 32 31 SEDIMENT DISCHARGE (TONS/DAY) 75 25 12 5.3 3.3 5.6 33 17 9.7 4.6 3.4 4.9 5.9 3.4 3.4 7.6 14 12 7.4 8.6 6.3 5.3 12 12 4.6 19 6.5 33 17 3.1 2.2 MEAN MEAN CONCBN- SEDIMENT DISCHARGE TRATION DISCHARGE (CPS) (MG/L) (TONS/DAY) NOVEMBER 24 21 20 19 17 16 16 16 30 33 32 21 18 41 156 1050 181 532 399 207 179 78 60 61 55 148 93 60 49 98 43 50 56 63 72 78 79 81 81 82 74 46 17 36 116 627 118 476 277 163 133 65 52 52 48 111 82 52 42 SO 2.7 2.8 3.0 3.3 3.3 3.5 3.5 3.5 6.8 7.3 6.5 2.8 .82 5.4 57 3980 65 1800 356 133 82 14 8.6 8.7 7.5 59 22 8.8 5.4 20 MEAN MEAN CONCBN- SEDIMENT DISCHARGE TRATION DISCHARGE (CPS) (MG/L) (TONS/DAY) DECEMBER 65 42 35 32 35 33 27 23 22 26 19 18 18 18 23 18 16 28 21 22 25 21 17 16 15 14 14 30 25 18 15 35 18 26 48 44 23 15 41 36 19 11 10 10 10 10 10 10 48 50 48 47 44 46 50 51 44 33 30 17 15 29 8.0 2.1 2.4 4.1 4.1 2.1 1.1 2.5 2.1 1.2 .68 .50 .47 .51 .63 .50 .44 3.9 2.9 2.7 3.2 2.5 2.2 2.1 2.1 1.7 1.2 2.6 1.3 .68 1.1 TOTAL 1810 382.1 3730 6682.22 751 63.61 274 RIO GRANDE DE LOIZA BASIN 50057000 RIO G0RABO AT G0RABO--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) JANUARY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 16 24 22 17 16 19 16 13 13 20 20 36 27 47 25 20 17 22 17 14 18 18 16 13 13 16 13 11 32 26 21 42 32 21 14 7 9 19 47 59 60 61 63 45 64 73 61 40 16 7 15 39 61 65 61 57 53 52 54 57 52 46 1.7 2.1 1.3 .62 .29 .42 .86 1.6 2.1 3.2 3.4 6.0 3.3 8.9 5.0 3.4 1.8 .88 .33 .54 2.1 3.0 2.8 2.1 2.0 2.2 1.9 1.5 5.1 3.5 2.7 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MO/L) (TONS/DAY) FEBRUARY 15 13 14 14 15 12 9.7 8.8 8.5 7.9 7.3 7.4 7.3 7.1 11 9.0 7.1 6.6 25 418 75 88 50 82 46 40 55 26 38 29 19 10 15 21 28 35 48 52 52 55 57 58 59 48 20 9 20 413 65 75 58 65 60 42 47 25 1.6 1.0 .73 .36 .61 .70 .72 .85 1.1 1.1 .99 1.1 1.2 1.1 1.8 1.2 .38 .15 3.2 885 15 19 8.0 15 7.8 4.8 7.2 1.9 MEAN DISCHARGE (CFS) 78 91 44 25 19 18 47 20 46 69 45 63 44 21 15 13 11 10 9.3 9.4 9.2 8.9 8.4 8.9 8.1 32 19 10 9.4 12 13 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) MARCH 59 85 60 53 45 40 41 32 35 64 83 81 41 22 16 14 13 13 14 28 56 66 59 52 45 42 32 26 20 14 12 38 23 7.0 3.7 2.3 2.0 5.5 1.8 4.7 16 10 15 5.5 1.3 .69 .45 .37 .38 .36 .70 1.4 1.6 1.4 1.3 .94 3.8 1.7 .71 .48 .43 .43 TOTAL 618 76.64 1085.7 983.59 836.6 152.94 RIO GRANDE DE LOIZA BASIN 50057000 RIO G0RABO AT GURABO--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 275 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CFS) (MO/L) (TONS/DAY) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 11 9.1 7.9 7.3 6.4 6.8 11 12 12 6.9 21 40 19 11 13 23 12 10 11 10 10 10 13 11 11 12 15 30 33 14 APRIL 10 8 8 7 7 7 7 7 33 25 21 37 14 8 6 4 4 5 6 7 7 7 6 8 10 33 11 23 59 42 ___ .26 .21 .18 .14 .12 .11 .20 .25 .97 .44 2.0 4.6 .83 .23 .21 .28 .14 .14 .17 .17 .20 .18 .19 .26 .32 1.1 .41 3.8 5.5 1.7 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) 9.8 10 12 13 11 16 18 15 77 188 127 50 47 51 44 27 139 44 25 20 15 13 12 11 11 13 11 13 15 17 15 MAY 32 27 23 19 16 9 10 40 64 140 133 72 51 46 33 22 110 70 60 54 50 47 43 40 39 32 18 9 9 9 10 .84 .74 .74 .65 .48 .36 .46 1.5 15 84 51 9.9 6.5 5.9 3.9 1.7 50 8.6 4.1 2.9 1.9 1.7 1.4 1.1 1.2 1.1 .54 .31 .36 .40 .42 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MO/L) (TONS/DAY) 19 19 23 72 14 92 43 13 9.6 9.8 8.8 27 14 8.6 8.5 44 57 81 29 16 12 10 9.2 7.9 7.3 12 30 17 20 58 JUNE 11 9 12 57 14 67 38 11 8 8 8 18 9 8 6 38 46 58 39 35 24 17 12 9 7 6 28 17 12 44 .57 .46 1.7 17 .60 26 5.4 .46 .21 .21 .20 1.5 .35 .17 .16 5.3 13 14 3.1 1.4 .79 .47 .29 .19 .15 .19 2.4 .83 .64 13 TOTAL 419.4 25.31 1089.8 259.70 791.7 110.74 276 RIO GRANDE DE LOIZA BASIN 50057000 RIO GORABO AT GORABO—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN DISCHARGE DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL YEAR (CFS) 94 26 18 13 11 13 14 25 16 15 13 14 11 10 9. 9. 11 63 74 27 15 11 11 14 14 15 15 17 11 16 18 643. 15886. 0 1 1 0 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) JULY 77 37 32 24 20 12 10 21 15 13 11 9 5 3 4 4 9 48 62 23 13 10 7 6 6 6 6 8 10 11 13 23 2.8 1.6 .85 .60 .41 .40 1.5 .63 .54 .35 .34 .14 .09 .09 .10 .28 15 14 1.8 .56 .30 .24 .23 .22 .25 .26 .39 .30 .49 .65 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) AUGUST 68.41 15944.53 28 22 17 12 12 12 9.9 7.1 14 12 43 26 16 24 16 13 13 17 104 67 37 27 24 52 65 26 13 15 49 21 12 826.0 19 16 17 15 10 6 4 4 3 7 34 12 6 16 8 7 7 4 77 25 6 6 15 46 55 30 25 18 83 57 15 1.5 .97 .77 .46 .34 .18 .11 .08 .12 .40 4.0 .87 .26 1.5 .34 .26 .26 .20 24 5.2 .61 .40 1.2 8.0 9.9 2.2 .92 .73 13 3.5 .54 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) SEPTEMBER 82.82 9.7 25 62 47 39 93 124 50 36 38 55 28 18 15 87 83 60 28 25 1870 194 78 49 44 32 25 22 18 16 14 3284.7 7 22 45 38 35 75 123 61 27 15 32 10 8 6 60 67 52 21 23 658 105 36 19 15 13 12 11 10 10 10 .18 2.4 8.3 5.3 4.2 31 44 8.6 2.5 1.6 5.3 .77 .39 .26 33 15 9.0 1.7 1.8 6800 65 7.9 2.5 1.8 1.2 .81 .65 .48 .43 .38 7056.45 RIO GRANDE DE LOIZA BASIN 50057000 RIO GDRABO AT ODRABO, PR—Continued WATER QUALITY DATA, WATER YEAR OCTOBER 1992 TO SEPTEMBER 1994 PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT 277 DATE NOV 1992 18. .. 30... JUN 1993 19. .. 19. .. JUL 15. .. SEP 30. .. NOV 18. .. 18. .. MAR 1994 20. .. SEP 20. .. 20. .. 20. .. 20. .. 20. .. 20. .. TIME 1537 1520 1015 1050 2345 1610 1750 1835 0500 1120 1200 1200 1325 1530 1530 DIS- CHARGE, INST. CUBIC FEET PER SECOND 2010 628 1290 1920 622 1180 1910 1480 1700 5410 6520 6520 6640 3270 6270 SEDI- MENT, SUS- PENDED (MG/L) 2070 10300 5630 5120 9480 4020 4180 1970 2390 2530 1580 2320 1680 1240 1480 SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) 11200 17500 19600 26500 15900 12800 21560 7880 10960 36900 27800 40900 30200 10920 25000 SED. SUSP. FALL DIAM. PERCENT FINER THAN .002 MM 58 20 32 36 13 43 41 53 55 45 1.0 46 50 57 75 SED. SUSP. FALL DIAM. PERCENT FINER THAN .004 MM 65 23 -- 41 14 50 47 59 64 54 12 52 59 62 82 SED. SUSP. FALL DIAM. PERCENT FINER THAN .008 MM 68 25 42 48 17 55 52 65 69 61 24 59 64 66 80 DATE NOV 1992 18.. . 30... JUN 1993 19... 19... JUL 15... SEP 30.. . NOV 18.. . 18.. . MAR 1994 20.. . SEP 20.. . 20.. . 20.. . 20.. . 20.. . 20.. . SBD. SUSP. FALL DIAM. PERCENT FINER THAN .016 MM 77 33 50 56 24 66 65 74 78 70 48 70 74 75 86 SBD. SUSP. FALL DIAM. PERCENT FINER THAN .031 MM 81 45 61 66 36 75 72 79 86 80 66 77 80 79 91 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .062 MM 95 66 75 82 54 92 83 91 94 91 83 90 91 92 98 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .125 MM 98 88 87 92 79 97 90 95 98 96 92 96 96 97 99.6 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .250 MM 99.3 94.7 95.4 97.7 93 99 96 98 99 99 97 99 99 99 99.9 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .500 MM 99.8 97 99 99.4 95 99.7 98 99 99.8 99.7 98 99.7 99.5 99.7 100 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN 1.00 MM 99.9 99 99.7 99.9 99.3 100 99 100 100 99.8 99 99.9 99.7 99.9 100 278 RIO GRANDB DB LOIZA BASIN 50057000 RIO GURABO XT GURABO, PR--Continu«d NXTER QUALITY DATA, HATER YEAR OCTOBER 1992 TO SEPTEMBER 1994 SILT AND CLAY PERCENT OF SUSPENDED SEDIMENT DATE NOV 1992 17... 18... 27... 27. .. 28. .. DEC 26... 26. .. 28... JAN 1993 29... FEB 03... APR 14... JUN 17. .. 19... 19. .. 29... SEP 30... OCT 30... NOV 18... FEB 1994 20... 20... MAY 11... JDN 18... SEP 20. .. 20... 20... 20... 20... 21... TIME 1558 1807 0020 2120 1658 1455 1614 1145 0420 1101 1300 1350 1320 1535 1025 1745 1647 1635 0530 0730 1810 1145 1230 1230 1305 1630 1630 1648 STREAM- FLOW, INSTAN- TANEOUS (CFS) 206 1200 697 1070 856 605 738 84 922 97 73 35 6620 4920 26 80 33 1480 1650 870 32 73 7180 7180 6940 2080 2080 135 SEDI- MENT, SUS- PENDED (MO/L) 194 851 700 826 583 754 796 85 916 232 287 91 1400 895 196 294 1860 1320 1290 596 78 46 1910 2050 1670 844 409 78 SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) 108 2760 1320 2390 1350 1230 1590 19 2280 61 57 8.6 25000 11900 14 64 166 5270 5750 1400 6.7 9.1 37000 39740 31300 4740 2300 28 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .062 MM 99 98 99 95 93 99 84 96 98 97 99 95 93 88 100 99 5 94 99 96 96 89 92 90 90 95 91 94 RIO GRANDB DB LOIZA BASIN 50057025 RIO GURABO NEAR GURABO, PR WATER-QOALITY RECORDS LOCATION.--Lat 18°15'56", long 65°59'04", at bridge on Highway 941, 1.2 mi (1.9 km) west-northwest from gaging station 50057000, and 1.0 mi (1.6 km) northwest of Gurabo plaza. DRAINAGE AREA.--62.8 mi' (162.7 km1 ). PERIOD OF RECORD.—Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 279 DATE OCT 1993 26... DEC 14. .. FBB 1994 16. .. APR 28. .. JUN 17. .. AOG 08. .. DATE OCT 1993 26. .. DEC 14. .. FBB 1994 16. .. APR 28. .. JDN 17. .. AOG 08. . . DATE OCT 1993 26. .. DEC 14. .. FEB 1994 16. .. APR 28. .. JDN 17. .. AOG 08. .. TIME 1100 1115 1100 0815 0740 0750 HARD- NESS TOTAL (MO/L AS CAC03 ) 110 -- -- 140 -- 140 SILICA, DIS- SOLVED (MO/L AS SI02) 30 -- -- 34 -- 37 DIS- CHARQB, INST. CUBIC FEET PER SECOND 0.0 0.0 0.0 9.1 256 7.3 CALCIUM DIS- SOLVED (MO/L AS CA) 24 -- -- 30 -- 31 SOLIDS , SUM OF CONSTI- TUENTS, DIS- SOLVED (MQ/L) 198 -- -- 271 -- 294 SPE- CIFIC CON- DUCT- ANCE (US /CM) 321 320 432 451 242 460 MAGNE- SIUM, DIS- SOLVED (MO/L AS MO) 11 -- -- 17 -- 16 SOLIDS, DIS- SOLVED (TONS PER DAY) -- -- -- 6.66 -- 5.77 PH WATER WHOLE FIELD (STAND- ARD UNITS) 7.3 7.4 7.2 7.1 7.2 7.1 SODIUM, DIS- SOLVED (MQ/L AS NA) 25 -- -- 36 -- 42 RESIDUE TOTAL AT 105 DEQ. C, SUS- PENDED (MQ/L) 22 7 6 18 28 21 TEMPER- ATURE WATER (DBG C) 28.5 29.5 27.0 28.0 27.5 29.0 SODIUM AD- SORP- TION RATIO 1 -- -- 1 -- 2 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.70 -- 1.0 -- 0.80 0.80 TUR- BID- ITY (NTU) 5.2 2.5 1.6 1.2 4.3 3.7 POTAS- SIUM, DIS- SOLVED (MQ/L AS K) 4.3 -- -- 5.1 -- 5.8 PHOS- PHORUS TOTAL (MG/L AS P) 0.370 -- 0.460 -- 0.480 0.580 OXYGEN, DIS- SOLVED (MO/L) 3.7 5.4 3.8 1.5 34.0 2.0 ALKA- LINITY WAT WH TOT FET FIELD MO/L AS CACO3 110 130 140 140 110 150 ARSENIC TOTAL (UG/L AS AS) 1 -- -- 2 -- -- OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 47 70 47 19 42 25 SULFIDB TOTAL (MG/L AS S) 0.6 -- -- <0.5 -- - — BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) 100 -- -- 100 -- -- OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MQ/L) 19 11 <10 13 22 33 SULFATB DIS- SOLVED (MO/L AS S04) 14 — — 23 -- 24 BORON, TOTAL RECOV- ERABLE (UG/L AS B) 40 -- -- 60 -- -- COLI- FORM, FECAL, 0.45 UM-MF (COLS . / 100 ML) 30000 9000 460 K77000 560 270 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 24 -- -- 42 -- 48 CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- <1 -- -- STREP- TOCOCCI FECAL, (COLS. PER 100 ML) 5300 4900 140 4100 450 510 FLUO- RIDB, DIS- SOLVED (MO/L AS F) 0.20 — — 0.20 — 0.20 CHRO- MIUM, TOTAL RECOV- ERABLE (UQ/L AS CR) <1 -- -- <1 -- -- K = non-ideal count 280 RIO GRANDB DE LOIZA BASIN 50057025 RIO GDRABO NEAR GORABO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 COPPER, TOTAL RECOV- ERABLE DATE (UG/L IRON, TOTAL RECOV- ERABLE (UG/L LEAD, TOTAL RECOV- ERABLE (UG/L MANGA- NESE, MERCURY TOTAL TOTAL RECOV- ERABLE (OG/L RECOV- ERABLE (UG/L SELE- NIUM, TOTAL (UG/L SILVER, TOTAL RECOV- ERABLE (UG/L ZINC, TOTAL RECOV- CYANIDE ERABLE TOTAL (UG/L (MG/L MBTHY- LENE BLUE ACTIVE PHENOLS SUB- TOTAL STANCE AS CU) AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1993 26. .. DEC 14. .. PEB 1994 16. .. APR 28. .. JUN 17. .. AUG 08. . . 1100 320 <0.10 630 <1 680 <0.10 <0.010 <1 0.02 <0.010 0.03 RIO GRANDE DE LOIZA BASIN 50058350 RIO CANAS AT RIO CANAS, PR 281 LOCATION.--Lat 18°17'41", long 66°02'44", Hydrologic Unit 21010005, at right bank, off road 798, upstream side of bridge on Highway 52, 0.5 mi (0.8 km ) northeast from Escuela Segunda Unidad de Francisco Valdes, and 0.8 mi (1.3 km) north of La Barra. DRAINAGE AREA.--7.53 mi* (19.50 km1 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--March 1990 to current year. GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 164 ft (50 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. Gage-height and precipitation satellite telemetry at station. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY OCT NOV 1 8.1 4.9 2 8.4 5.0 3 10 .9 4 45 .6 5 9.9 .4 6 10 .4 7 46 .4 8 11 5.0 9 7.6 6.4 10 6.5 8.0 11 5.8 5.3 12 5.5 4.9 13 5.1 5.1 14 4.8 18 15 4.4 20 16 26 18 17 8.7 18 18 5.5 61 19 5.2 13 20 5.3 11 21 5.6 10 22 6.7 6.8 23 5.7 6.1 24 5.3 7.2 25 5.2 8.9 26 5.2 9.5 27 .9 6.9 28 .9 7.0 29 .9 7.2 30 .6 6.6 31 .4 --- TOTAL 296.2 302.5 MEAN 9.55 10.1 MAX 46 61 MIN 4.4 4.4 AC-FT 588 600 CFSM 1.27 1.34 IN. 1.46 1.49 STATISTICS OF MONTHLY MEAN MEAN 17.1 15.4 MAX 39.4 36.2 (WY) 1991 1993 MIN 4.60 7.18 (WY) 1992 1991 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN- DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE INSTANTANEOUS LOW FLOW ANNUAL RUNOFF (AC-FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS DEC 6.2 5.9 5.8 8.4 6.8 5.8 5.5 5.4 5.2 5.3 5.2 5.1 5.1 6.2 4.8 4.4 4.2 13 5.1 4.7 4.5 4.4 4.4 4.2 4.2 4.2 7.9 6.3 4.9 4.6 4.2 171.9 5.55 13 4.2 341 .74 .85 DATA 13.3 29.9 1993 5.55 1994 FOR JAN 4.3 5.0 4.4 4.4 4.5 4.4 4.2 4.2 4.1 3.9 6.5 4.7 4.6 4.4 4.2 4.5 4.7 4.4 4.1 5.2 4.5 3.9 7.3 4.5 4.1 3.7 3.7 4.0 4.2 4.2 4.2 139.0 4.48 7.3 3.7 276 .60 .69 FOR WATER 11.6 24.5 1992 4.48 1994 FEB .2 .2 .2 .8 .7 .3 .2 .2 3.9 3.9 3.7 3.7 3.4 3.5 3.7 3.6 3.3 3.3 3.4 3.5 3.6 3.5 3.5 3.5 3.5 3.6 16 5.2 ___ ___ --- 120.1 4.29 16 3.3 238 .57 .59 YEARS 1990 8.34 13.2 1991 4.29 1994 MAR 4.7 5.3 3.3 2.9 2.9 2.9 2.7 2.5 2.5 4.1 2.4 2.2 2 -> . ^ 2 -> . ^ 2.2 2.2 2.1 2.1 2.0 1.9 1.9 1.8 1.8 1.8 1.8 1.8 1.8 1.9 2.7 2.4 1.9 76.9 2.48 5.3 1.8 153 .33 .38 - 1994 4.67 5.88 1992 2.48 1994 1993 CALENDAR YEAR 4109. 11. 236 2. 3. 8150 1. 20. 20 6. 3. 7 3 Jul 11 8 Sep 10 2 Aug 28 50 30 2 6 APR 1.9 1.9 1.9 3.5 4.4 3.1 2.3 2.3 2.3 e8.8 ell e24 e4.8 e4.6 3.4 3.1 5.2 3.4 12 4.3 3.4 2.9 2.9 2.8 2.9 2.7 3.0 4.1 3.1 2.8 --- 138.8 4.63 24 1.9 275 .61 .69 MAY 2.7 2.7 2.7 2.6 2.7 2.7 3.1 4.0 4.0 3.7 3.6 3.1 3.0 2.8 2.5 2.4 2.4 3.0 2.7 2.2 1.8 1.7 1.7 1.6 2.0 2.3 2.1 1.4 1.4 1.5 1.5 77.6 2.50 4.0 1.4 154 .33 .38 JUN 1.4 1.2 1.7 1.4 1.4 5.5 1.3 1.1 1.2 1.1 1.4 1.1 1.2 1.2 el.l el. 6 e2.6 e2.3 el. 8 el. 6 el. 6 el. 6 1.6 1.6 1.5 2.9 2.0 1.7 1.6 4.0 --- 53.3 1.78 5.5 1.1 106 .24 .26 JUL 2.1 3.4 1.8 1.7 1.7 5.4 4.4 3.1 2.8 2.4 2.4 2.3 2.1 1.9 1.9 1.9 1.9 25 5.5 4.2 3.1 3.0 2.9 2.8 2.5 2.9 3.5 4.4 3.9 3.6 5.1 115.6 3.73 25 1.7 229 .50 .57 AUG 3.8 3.5 3.2 2.9 3.2 2.9 16 5.5 8.9 6.1 4.9 3.7 3.4 3.1 3.0 2.8 2.5 12 34 11 7.4 6.5 8.1 35 23 8.2 9.6 224 8.4 2.9 2.1 471.6 15.2 224 2.1 935 2.02 2.33 SEP 2.6 2.7 2.1 1.7 1.6 7.2 2.7 2.0 1.9 1.8 2.3 1.9 12 1.8 2.2 1.9 5.6 2.0 2.2 48 8.3 3.0 3.6 7.4 2.4 1.8 1.7 1.6 1.8 4.5 --- 142.3 4.74 48 1.6 282 .63 .70 , BY WATER YEAR (WY) 5.67 11.1 1993 3.53 1990 FOR 1994 2105. 5. 224 1. 1. 2250 17. 1. 4180 . 10. 8. 3. 1. 10.5 19.5 1992 2.50 1994 WATER YEAR 8 77 Aug 28 1 Jun 8 2 Jun 8 Aug 28 67 Aug 28 0 Jun 2 77 40 5 8 8 9.03 20.0 1993 1.78 1994 10.4 24.9 1993 3.40 1990 WATER 10. 15. 5. 292 1. 1. 3830 20. 1. 7890 1. 19. 16 5. 2. 9.75 17.2 1992 4.36 1990 YEARS 1990 9 9 77 Oct 1 Jun 2 Jun Oct 55 Oct 0 Jun 45 64 0 9 7.50 12.9 1992 4.74 1994 - 1994 1993 1994 17 1990 8 1994 8 1994 17 1990 17 1990 2 1994 e Estimated 282 RIO GRANDE DE LOIZA BASIN 5005S350 RIO CANAS AT RIO CANAS, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORD.-- Hater years 1990 to current year. PERIOD OF DAILY RECORD.-- SUSPENDED-SEDIMENT DISCHARGE: March 1990 to September 1994. INSTRUMENTATION.-- Automatic aediment sampler. REMARKS.— Sediment samples were collected by a local observer on a weekly basis and during high flow events. EXTREMES FOR PERIOD OF DAILY RECORD.-- SEDIMENT CONCENTRATION: Maximum daily mean, 3,600 mg/L Aug. 28, 1994; Minimum daily mean, 1 mg/L September 11,1991 SEDIMENT LOADS: Maximum daily mean, 10,800 tons (9,800 tonnes) Aug. 28, 1994; Minimum daily mean, 0.02 ton (0.02 tonne) several days. EXTREMES FOR CURRENT YEAR 1994.-- SEDIMENT CONCENTRATION: Maximum daily 3 mg/L several days. in, 3,600 mg/L Aug. 28, 1994; Minimum daily SEDIMENT LOADS: Maximum daily mean, 10,800 tons (9,800 tonnes) Aug. 28, 1994; Minimum daily mean, 0.02 ton (0.02 tonne) several days. SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCBN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) OCTOBER 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 8.1 8.4 10 45 9.9 10 46 11 7.6 6.5 5.8 5.5 5.1 4.8 4.4 26 8.7 5.5 5.2 5.3 5.6 6.7 5.7 5.3 5.2 5.2 .9 .9 .9 .6 .4 49 55 64 796 64 70 920 68 19 17 16 14 13 13 13 1440 57 18 13 13 13 29 21 12 11 11 10 11 12 12 12 1.1 1.4 1.9 458 2.0 3.1 484 2.9 .38 .29 .25 .21 .18 .17 .16 510 1.8 .29 .20 .20 .20 1.0 .38 .17 .16 .15 .14 .15 .16 .16 .16 NOVEMBER 4.9 5.0 .9 .6 .4 .4 .4 5.0 6.4 8.0 5.3 4.9 5.1 18 20 18 18 61 13 11 10 6.8 6.1 7.2 8.9 9.5 6.9 7.0 7.2 6.6 ___ 12 11 10 10 10 10 10 16 10 44 19 18 21 226 182 146 209 1500 108 110 65 14 12 14 17 17 11 8 10 10 .17 .16 .14 .13 .12 .12 .12 .30 .16 2.0 .26 .24 .31 48 14 11 34 1010 4.0 4.6 1.8 .25 .20 .28 .41 .42 .21 .16 .19 .18 DECEMBER 6.2 5.9 5.8 8.4 6.8 5.8 5.5 5.4 5.2 5.3 5.2 5.1 5.1 6.2 4.8 4.4 4.2 13 5.1 4.7 4.5 4.4 4.4 4.2 4.2 4.2 7.9 6.3 4.9 4.6 4.2 10 10 10 10 10 11 12 12 12 11 10 10 10 24 10 10 10 100 22 20 20 20 20 20 20 20 46 32 18 16 12 .16 .16 .16 .22 .18 .17 .17 .18 .16 .15 .14 .14 .14 .76 .14 .12 .12 8.5 .32 .26 .25 .24 .23 .22 .22 .23 1.4 .68 .23 .19 .14 TOTAL 296.2 1471.36 302.5 1133.93 171.9 16.38 RIO GRANDE DE LOIZA BASIN 50058350 RIO CANAS AT CANAS, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 283 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) JANUARY 1 2 3 4 5 6 7 0 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 20 29 30 31 TOTAL 4.3 5.0 4.4 4.4 4.5 4.4 4.2 4.2 4.1 3.9 6.5 4.7 4.6 4.4 4.2 4.5 4.7 4.4 4.1 5.2 4.5 3.9 7.3 4.5 4.1 3.7 3.7 4.0 4.2 4.2 4.2 139.0 11 10 10 10 9 12 27 65 91 09 04 02 57 24 0 6 9 10 13 23 41 55 01 29 15 11 12 16 37 55 55 .14 .13 .12 .11 .10 .14 .31 .74 .99 .93 1.5 1.0 .71 .29 .10 .09 .12 .12 .14 .31 .40 .60 3.0 .40 .15 .10 .11 .17 .42 .62 .62 14.76 MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) FEBRUARY .2 .2 .2 .0 .7 .3 .2 .2 3.9 3.9 3.7 3.7 3.4 3.5 3.7 3.6 3.3 3.3 3.4 3.5 3.6 3.5 3.5 3.5 3.5 3.6 16 5.2 ___ ___ —— 120.1 57 56 52 50 50 52 56 59 59 55 40 43 27 12 6 7 10 21 12 7 4 3 4 15 40 40 204 24 ___ ___ —— .64 .63 .50 .60 .62 .60 .63 .65 .63 .57 .40 .42 .25 .11 .06 .06 .16 .19 .11 .06 .03 .02 .03 .14 .30 .30 35 .42 ___ --- 44.45 MARCH 4.7 5.3 3.3 2.9 2.9 2.9 2.7 2.5 2.5 4.1 2.4 2.2 2.2 2.2 2.2 2.2 2.1 2.1 2.0 1.9 1.9 1.0 1.0 1.0 1.0 1.0 1.0 1.9 2.7 2.4 1.9 76.9 19 31 49 53 50 65 71 74 75 137 05 63 44 32 21 12 0 7 9 21 35 40 39 37 35 35 35 202 41 47 30 .32 .55 .44 .42 .40 .51 .49 .49 .50 1.9 .54 .37 .26 .19 .12 .06 .04 .04 .05 .11 .10 .20 .19 .10 .10 .10 .18 .99 .33 .32 .20 11.01 284 RIO GRANDE DE LOIZA BASIN 50058350 RIO CANAS AT CANAS, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY}, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) APRIL 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 1.9 1.9 1.9 3.5 4.4 3.1 2.3 2.3 2.3 e8.8 •11 •24 e4.8 e4.6 3.4 3.1 5.2 3.4 12 4.3 3.4 2.9 2.9 2.8 2.9 2.7 3.0 4.1 3.1 2.8 ___ 24 13 10 18 25 24 30 33 43 81 92 337 90 80 80 80 79 65 177 98 58 23 14 12 11 9 8 9 14 23 .13 .07 .05 .19 .44 .21 .19 .20 .27 e4.8 e4.6 e51 el. 2 el.O .74 .67 1.5 .65 26 1.2 .54 .18 .11 .09 .08 .07 .06 .09 .11 .17 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) MEAN DISCHARGE (CFS) MAY 2.7 2.7 2.7 2.6 2.7 2.7 3.1 4.0 4.0 3.7 3.6 3.1 3.0 2.8 2.5 2.4 2.4 3.0 2.7 2.2 1.8 1.7 1.7 1.6 2.0 2.3 2.1 1.4 1.4 1.5 1.5 24 19 17 16 14 12 12 14 14 10 6 7 13 18 17 14 14 23 15 10 8 5 3 3 5 5 3 3 3 6 8 .17 .14 .13 .11 .09 .08 .10 .16 .15 .10 .06 .07 .11 .14 .12 .09 .10 .23 .11 .06 .05 .03 .02 .02 .02 .03 .02 .02 .02 .03 .03 1.4 1.2 1.7 1.4 1.4 5.5 1.3 1.1 1.2 1.1 1.4 1.1 1.2 1.2 el.l el. 6 e2.6 e2.3 el. 8 el. 6 el. 6 el. 6 1.6 1.6 1.5 2.9 2.0 1.7 1.6 4.0 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) JUNE 8 8 8 13 14 46 15 13 11 9 10 16 24 30 31 25 15 7 5 5 5 5 5 5 5 12 7 5 5 22 .02 .02 .04 .06 .06 2.0 .06 .03 .03 .02 .03 .05 .07 .09 e.09 .10 .09 .05 .03 .02 .02 .02 .02 .02 .02 .14 .04 .02 .02 .47 TOTAL 138.8 96.61 77.6 2.61 53.3 3.75 Estimated 285 RIO GRANDE DB LOIZA BASIN 50058350 RIO CANAS AT CANAS, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CFS) (MO/L) (TONS/DAY) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL YEAR 2.1 3.4 1.8 1.7 1.7 5.4 4.4 3.1 2.8 2.4 2.4 2.3 2.1 1.9 1.9 1.9 1.9 25 5.5 4.2 3.1 3.0 2.9 2.8 2.5 2.9 3.5 4.4 3.9 3.6 5.1 115.6 2105.8 JULY 10 18 5 5 5 23 13 10 9 9 11 11 11 10 10 10 10 357 21 9 8 8 8 8 8 8 8 8 8 8 19 —— MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) AUGUST .06 .42 .02 .02 .02 .47 .17 .08 .07 .06 .07 .07 .06 .06 .06 .06 .06 95 .40 .10 .06 .06 .06 .06 .06 .07 .08 .09 .09 .08 .30 98.34 14715.96 3.8 3.5 3.2 2.9 3.2 2.9 16 5.5 8.9 6.1 4.9 3.7 3.4 3.1 3.0 2.8 2.5 12 34 11 7.4 6.5 8.1 35 23 8.2 9.6 224 8.4 2.9 2.1 471.6 12 10 10 10 10 10 248 26 52 25 19 12 10 10 10 10 10 95 824 60 33 24 39 598 264 44 53 3600 48 11 10 —— .13 .09 .08 .09 .09 .08 78 .53 2.0 .50 .30 .11 .09 .08 .08 .07 .06 7.0 387 2.2 .74 .42 1.5 175 35 1.0 2.2 10800 2.0 .09 .06 11496.59 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) SEPTEMBER 2.6 2.7 2.1 1.7 1.6 7.2 2.7 2.0 1.9 1.8 2.3 1.9 12 1.8 2.2 1.9 5.6 2.0 2.2 48 8.3 3.0 3.6 7.4 2.4 1.8 1.7 1.6 1.8 4.5 142.3 10 10 10 10 10 55 14 11 8 7 5 5 204 10 8 6 45 10 11 709 63 48 39 57 9 6 6 36 6 26 —— —— .06 .06 .06 .05 .04 4.4 .12 .07 .05 .03 .03 .03 78 .05 .04 .03 5.3 .06 .07 228 3.0 .41 .82 4.2 .06 .03 .02 .16 .02 .90 --- 326.17 286 RIO GRANDE DE LOIZA BASIN 50058350 RIO CANAS AT CANAS, PR--Continued WATER QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT DATE OCT 1993 16... NOV 17... 18... JUL 1994 02... SEP 20... TIME 1915 1748 1450 1613 1115 DIS- CHARGE, INST. CUBIC FEET PER SECOND 184 60 454 13 144 SEDI- MENT, SUS- PENDED (MO/L) 13890 7920 16140 1570 6150 SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) 6900 1280 19800 55 2390 SED. SUSP. FALL DIAM. PERCENT FINER THAN .002 MM 29 37 28 69 44 SED. SUSP. FALL DIAM. PERCENT FINER THAN .004 MM 42 53 38 70 56 SED. SUSP. FALL DIAM. PERCENT FINER THAN .008 MM 55 69 50 82 68 DATE OCT 1993 16... NOV 17... 18... OUL 1994 02... SEP 20... SED. SUSP. FALL DIAM. PERCENT FINER THAN .016 MM 70 86 64 88 80 SED. SUSP. FALL DIAM. PERCENT FINER THAN .031 MM 82 95 78 89 89 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .062 MM 91 99 90 99 99 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .125 MM 97 99.8 97 99.7 99.8 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .250 MM 99 99.9 99 99.8 99.9 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .500 MM 99.4 100 99.8 100 100 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN 1.00 MM 100 100 100 100 100 RIO GRANDS DE LOIZA BASIN 50056350 RIO CANAS AT CANAS, PR- -Continued WATER QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 SILT AND CLAY PERCENT OF SUSPENDED SEDIMENT 287 DATE OCT 1993 06... NOV 10. .. 16. .. 16... MAR 1994 10... AUO 09... SEP 14... 20... TIME 1720 1744 1410 1450 0915 1255 1740 1015 STREAM- FLOW, INSTAN- TANEOUS (CFS) 9.6 7.9 296 365 8.7 6.1 1.6 151 SEDI- MENT, SUS- PENDED (MO/L) 2550 2170 21000 6870 211 151 242 4560 SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) 66 46 16900 6770 5.0 2.5 1.0 1870 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .062 MM 100 99 87 92 95 100 99 99 RIO GRANDB DB LOIZA BASIN 50059000 LAGO LOIZA AT DAMSITB, PR LOCATION.--Lat 18°19'49", long 660 01'00", Hydrologic Unit 21010005, at pumpsite at damsite, and 1.9 mi (3.1 km) south of Trujillo Alto plaza. DRANAIGB AREA.--208 ml 1 (539 km»). ELEVATION RECORDS PERIOD OP RECORD.—December 1987 to current year. GAGE.--Hater-stage recorder. Datum of gage i s mean sea level. REMARKS.--Lake is formed by Lolza Dam, a concrete structure completed in 1954. Useable capacity of impoundment is 30,000 acre-ft (37.0 hm3 ) . Out flow from lake is controlled by five slide gates in powerplant and pump intake structure, four sluice gates, and concrete spillway with eight radial gates. Lake is used for municipal water supply and intermittent power generation. Gage-height satellite telemetry at station. EXTREMES OBSERVED FOR PERIOD OF RECORD.--Maximum elevation 147.42 ft (44.93 m), Sept. 18, 1989; minimum elevation, 108.52 ft (33.08 m), July 18, 1994. EXTREMES FOR CURRENT YEAR.--Maximum elevation 134.66 ft (41.04 m), Mar. 2; minimum elevation, 108.52 ft (33.08 m), July 18. 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 5,000 128.6 18,000 111.5 8,900 137.8 26,000 120.4 13,000 147.6 35,000 ELEVATION (FEET NGVD), HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY OBSERVATION AT 24:00 VALUES DAY OCT NOV DEC JAN FBB MAR APR MAY JUN JUL AUG SEP 1 133.62 133.10 133.28 132.79 132.79 134.50 130.66 122.83 118.26 115.44 112.50 117.88 2 132.98 133.08 133.46 132.85 132.69 134.40 130.40 122.41 117.78 115.42 112.24 117.76 3 133.60 133.00 133.56 132.87 132.57 134.46 130.14 122.01 117.32 115.10 111.86 118.06 4 133.30 132.94 133.70 132.81 132.51 134.42 129.88 121.67 117.20 115.02 111.38 118.16 5 133.48 132.84 132.68 132.83 132.41 134.36 129.60 121.45 116.80 114.74 110.92 118.10 6 133.02 132.74 132.86 132.85 132.31 134.26 129.32 121.35 117.32 114.58 110.44 118.92 7 132.58 132.66 132.90 132.81 132.19 134.20 129.10 121.17 117.48 114.18 110.18 120.08 8 132.86 132.64 132.96 132.75 132.01 134.12 128.84 120.91 117.20 113.82 109.80 120.28 9 132.98 132.68 133.00 132.71 131.85 134.10 128.54 120.95 116.74 113.32 109.44 120.42 10 133.06 132.68 133.03 132.81 131.69 134.22 128.46 121.99 116.29 112.80 109.06 120.58 11 133.10 132.74 133.02 132.95 131.53 134.18 128.44 122.79 115.82 112.22 109.32 120.92 12 133.30 132.68 133.02 133.03 131.35 134.33 128.53 122.84 115.48 111.57 109.46 121.22 13 133.34 132.62 133.00 133.09 131.17 134.35 128.32 122.85 115.12 110.79 109.40 121.26 14 133.38 132.84 132.98 133.49 131.01 134.20 128.13 122.91 114.64 110.00 109.46 121.19 15 133.36 133.52 132.96 133.55 130.97 134.08 127.91 122.93 114.02 109.38 109.48 122.40 16 133.02 132.63 132.94 133.57 130.83 133.92 127.71 122.83 113.88 109.08 109.14 123.48 17 133.44 133.48 132.90 133.57 130.63 133.74 127.47 123.17 114.04 108.62 108.90 124.38 18 133.54 132.98 133.04 133.57 130.45 133.56 127.19 123.07 115.00 114.28 108.70 124.54 19 133.57 132.72 133.06 133.53 130.39 133.36 126.93 122.87 114.98 115.70 109.48 124.72 20 133.60 133.81 133.06 133.53 134.24 133.18 126.61 122.61 114.74 115.92 109.78 132.38 21 133.12 132.76 133.08 133.53 133.89 132.98 126.25 122.29 114.28 115.78 109.70 133.42 22 133.20 133.42 133.04 133.51 134.07 132.78 125.91 121.97 113.84 115.64 109.46 133.80 23 133.36 132.88 133.00 133.53 134.36 132.56 125.59 121.65 113.17 115.30 109.42 133.16 24 133.48 133.26 132.96 133.44 134.06 132.32 125.17 121.33 112.54 115.14 110.28 133.34 25 133.50 133.60 132.90 133.35 134.16 132.12 124.81 121.01 111.86 114.64 115.34 133.38 26 27 28 29 30 31 MEAN 133.21 133.00 133.02 133.15 132.45 133.33 127.30 121.69 115.33 113.52 111.60 125.32 MAX 133.62 133.81 133.70 133.57 134.36 134.50 130.66 123.17 118.26 115.92 118.26 133.80 MIN 132.58 132.62 132.68 132.71 130.39 130.91 123.19 118.76 111.86 108.62 108.70 117.76 132.70 132.76 132.98 133.14 133.14 133.10 133.34 132.82 133.19 133.38 132.89 ___ 132.84 132.82 132.90 132.88 132.87 132.81 133.26 133.15 133.03 133.01 132.95 132.91 134.18 134.24 134.18 ___ ___ ___ 131.96 131.74 131.56 131.32 131.12 130.91 124.44 124.09 123.77 123.53 123.19 120.63 120.37 119.97 119.61 119.18 118.76 114.14 115.08 115.04 114.90 115.00 ___ 114.41 113.93 113.70 113.25 112.92 112.52 115.85 115.96 117.94 118.26 118.25 118.10 133.37 133.31 133.18 133.03 133.00 --- RIO GRANDB DE LOIZA BASIN 50059000 LAGO LOIZA AT DAMSITB, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°19'49", long 66°01'00», at pumphouse at damsits, and 1.9 mi (3.1 km) south of Trujillo Alto plaza. DRAINAGE ARBA.--208 ml' (539 km1 ). PERIOD OF RECORD.--Water years 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 289 DATE OCT 1993 12.. . DEC 20... FBB 25... APR 1994 29.. . JUN 14.. . AUG 12.. . DATE OCT 1993 12. .. DEC 20. .. APR 1994 29... JUN 14. .. AUG 12... PH OXYGEN, OXYGEN COLI- ALKA- RESIDUE SPB- WATER DIS- DEMAND, FORM, STREP- LINITY TOTAL CIFIC WHOLE SOLVED CHEM- FECAL, TOCOCCI WAT WH AT 105 CON- FIELD TEMPER- OXYGEN, (PER- ICAL 0.45 FECAL, TOT PET SULFIDB DBG. C, DUCT- (STAND- ATURB DIS- CENT (HIGH UM-MF (COLS. FIELD TOTAL SUS- TIMB ANCB ARD WATER SOLVED SATUR- LEVEL) (COLS./ PER MG/L AS (MG/L PBNDBD (US/CM) UNITS) (DBG C) (MG/L) ATI ON) (MG/L) 100 ML) 100 ML) CACO3 AS S) (MG/L) 1215 1600 1020 0905 1050 0950 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.70 0.30 2.1 1.8 1.9 220 312 305 348 428 451 NITRO- GEN, TOTAL (MG/L AS N) 0.70 0.30 2.1 1.8 1.9 7.1 7.5 7.3 6.9 7.0 6.9 PHOS- PHORUS TOTAL (MG/L AS P) 0.100 0.150 0.160 0.150 0.130 30.5 29.0 25.0 28.0 27.5 28.0 BORON, TOTAL RECOV- ERABLE (UG/L AS B) 30 -- 60 -- -- 3.0 5.8 1.6 0.2 0.2 0.5 COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) <10 — <10 — — 39 75 20 2 2 6 IRON, TOTAL RECOV- ERABLE (UG/L AS FB) 200 -- 90 -- -- 19 14 26 11 28 40 MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) 120 -- 310 -- -- K30 54 26 K4 K34 52 ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) <10 -- <10 -- -- K90 74 <0.5 42 90 20 92 Kll 110 <0.5 80 140 39 120 METHY- LENB BLUB CYANIDE ACTIVE TOTAL PHENOLS SUB- (MG/L TOTAL STANCE AS CN) (UG/L) (MG/L) <0.010 <1 0.03 __ <0.010 2 0.04 — — 13 1 11 6 4 14 K = non-ideal count 290 RIO GRANDS DB LOIZA BASIN 50059050 RIO GRANDB DB LOIZA BELOW DAMSITB, 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 ARBA.--209 mi 1 (541 km1 ). WATER-DISCHARGE RECORDS PERIOD OP RECORD.— December 1986 to current year. GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 32 ft (10 m), from topographic map. REMARKS.--Records poor. Plow regulated by Lago Loiza Dam. Gage-height and precipitation satellite telemetry at station. DISCHARGE, CUBIC PBBT PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY OCT NOV DEC JAN FEE MAR APR JUL AUG SEP 1 7.3 6.5 2 324 7.2 3 5.6 7.0 4 270 6.5 5 6.1 7.0 6 255 6.6 7 404 6.3 8 7.4 8.9 9 6.6 8.5 10 6.5 7.7 11 6.4 8.3 12 6.3 8.3 13 6.3 8.6 14 6.2 9.5 15 6.4 12 16 338 1690 17 8.2 70 18 6.6 1300 19 5.9 689 20 6.7 217 21 124 773 22 8.1 5.3 23 7.3 184 24 7.2 5.5 25 7.0 5.1 26 244 243 27 6.9 218 28 6.9 5.3 29 6.9 4.8 30 6.6 236 31 6.5 --- TOTAL 2120.9 5764.9 MEAN 68.4 192 MAX 404 1690 MIN 5.6 4.8 AC-PT 4210 11430 CPSM .33 .92 IN. .38 1.03 STATISTICS OP MONTHLY MEAN MEAN 269 642 MAX 842 2732 (WY) 1991 1988 MIN 44.7 88.6 (WY) 1992 1990 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN-DAY MINIMUM INSTANTANEOUS PEAK PLOW INSTANTANEOUS PEAK STAGE ANNUAL RUNOPP (AC-PT) ANNUAL RUNOPP (CPSM) ANNUAL RUNOPP (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 4.8 4.3 4.4 5.3 335 5.9 5.8 6.0 6.2 6.5 6.9 6.0 6.3 6.6 6.7 6.6 6.5 7.7 7.0 6.7 7.0 7.0 7.5 7.3 7.2 7.3 7.4 7.7 7.3 7.5 7.5 531.9 17.2 335 4.3 1060 .08 .09 DATA 464 2603 1988 17.2 1994 POR 7.5 7.6 7.2 7.4 7.6 7.3 7.5 7.4 7.0 7.1 8.0 7.3 7.2 6.6 7.0 7.2 7.3 7.2 6.6 7.2 6.5 7.6 7.0 6.5 6.9 6.1 6.7 6.2 6.4 5.9 6.5 217.5 7.02 8.0 5.9 431 .03 .04 POR WATER 171 733 1992 5.05 1990 6.2 6.5 6.9 6.3 6.6 5.8 6.2 6.1 6.0 6.0 6.4 6.9 11 13 13 11 10 9.5 8.8 8.5 141 6.1 5.3 140 4.3 4.1 4.6 4.4 ___ ___ --- 470.5 16.8 141 4.1 933 .08 .08 YEARS 1987 81.2 242 1989 4.52 1990 4.1 131 4.4 4.7 4.2 4.8 5.4 4.9 5.8 4.5 5.4 4.6 5.1 4.9 4.8 5.2 4.3 4.7 4.6 4.1 4.4 4.2 3.9 3.3 3.0 2.8 2.9 2.9 3.5 3.1 3.5 259.0 8.35 131 2.8 514 .04 .05 - 1994 57.0 299 1989 6.45 1990 1993 CALENDAR YEAR 53403. 146 11600 3. 4. 105900 . 9. 311 7. 5. 7 Jul 11 6 Apr 25 1 Apr 22 70 51 7 3 3.1 3.1 3.6 3.5 4.0 3.8 .0 .6 .2 .2 .6 .3 .1 .0 .3 3.9 3.9 3.7 3.1 5.0 5.1 4.7 4.2 3.6 2.8 2.5 2.7 2.5 2.4 3.4 --- 115.9 3.86 7.2 2.4 230 .02 .02 2.5 1.9 1.6 1.6 1.7 1.8 2.0 2.1 2.1 2.0 1.9 1.8 1.8 1.9 1.8 3.0 2.1 1.7 1.5 1.8 1.5 2.1 1.9 2.2 2.5 2.1 2.1 2.1 2.4 2.2 1.8 61.5 1.98 3.0 1.5 122 .01 .01 1.9 2.1 2.1 1.6 1.5 1.4 1.5 1.4 1.9 2.1 2.0 2.0 2.2 1.9 2.4 2.2 2.7 2.6 1.8 1.6 1.4 1.7 2.0 2.3 2.6 2.7 2.5 1.5 1.6 1.5 --- 58.7 1.96 2.7 1.4 116 .01 .01 2.1 2.4 2.1 1.6 1.7 2.5 2.0 1.9 1.6 1.6 1.5 1.4 1.5 1.4 1.3 1.2 1.2 1.4 1.5 2.1 2.7 2.8 2.0 1.8 1.4 1.0 1.2 .99 .88 e.80 e.74 50.31 1.62 2.8 .74 100 .01 .01 e.74 e.68 e.62 e.62 e.58 e.56 e.60 e.56 e.54 e.50 e.49 e.49 e.48 e.48 e.50 e.48 e.49 e.50 e.48 e.49 e.49 e.49 9.4 9.4 3.0 1.9 1.7 20 6.0 3.0 2.3 68.56 2.21 20 .48 136 .01 .01 3.0 2.5 2.4 2.2 2.2 2.5 2.9 3.0 2.5 3.1 11 11 12 11 7.2 5.3 4.4 4.1 4.2 3260 652 4.6 56 3.3 el. 7 el. 7 el. 6 el. 8 el. 7 el. 7 --- 4082.6 136 3260 1.6 8100 .65 .73 , BY WATER YEAR (WY) 38.9 112 1987 3.86 1994 POR 1994 13802 37 3260 33900 24 27380 2 9 4 1 116 367 1992 1.98 1994 WATER YEAR .27 .8 Sep 20 .48 Aug 13 .49 Aug 11 Sep 20 .91 Sep 20 .18 .46 .5 .4 .4 200 784 1987 1.96 1994 184 672 1993 1.62 1994 WATER 227 652 37 51200 124000 39 164200 1 14 394 9 4 161 718 1988 2.21 1994 YEARS 1987 .8 Nov .48 Aug .49 Aug Nov . 57 Nov .08 .73 .4 .3 366 1612 1989 29.7 1990 - 1994 1988 1994 27 1987 13 1994 11 1994 27 1987 27 1987 e Estimated RIO GRANDB DB LOIZA BASIN 50059050 RIO ORANDB DB LOIZA BELOW DAMSITE LOIZA, PR—Continued WATER-QUALITY RECORDS PERIOD OF RECORD.-- Water year* 1987 to current year. PERIOD OF DAILY RECORD.-- SUSPENDED-SEDIMENT DISCHARGE: December 1966 to September 1994. INSTRUMENTATION.— Automatio •ediment aanpler. REMARKS.-- Sediment aamplea were collected by a looal observer on a weekly baaia and during high flow event*. EXTREMES FOR PERIOD OF DAILY RECORD.— SEDIMENT CONCENTRATION: Maximum daily mean,946 mg/L Jan. 06, 1993; Minimum daily mean, 1 mg/L several daya SEDIMENT LOADS: Maximum daily mean, 90,600 ton* (09,400 tonnea) Jan. 05, 1993; Minimum daily mean, 0.01 ton (0.01 tonne) aeveral daya. EXTREMES FOR CURRENT YEAR 1994.-- SBDIMENT CONCENTRATION: Maximum daily mean, 142 mg/L Nov. 10, 1993; Minimum daily mean, 1 mg/L Aug. 21-22, 1994. SEDIMENT LOADS: Maximum daily mean, 3,300 tona (3,070 tonnea) Sep. 20, 1994; Minimum daily mean, 0.01 ton (0.01 tonne) aeveral day*. SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 291 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) OCTOBER 1 2 3 4 5 6 7 0 9 10 11 12 13 14 15 16 17 10 19 20 21 22 23 24 25 26 27 20 29 30 31 7.3 324 5.6 270 6.1 255 404 7.4 6.6 6.5 6.4 6.3 6.3 6.2 6.4 330 0.2 6.6 5.9 6.7 124 0.1 7.3 7.2 7.0 244 6.9 6.9 6.9 6.6 6.5 15 20 10 26 17 23 27 15 14 11 6 3 3 3 3 22 16 14 15 15 23 22 21 20 17 24 15 15 14 15 15 .36 162 .26 135 .20 125 197 .30 .25 .19 .10 .06 .06 .05 .05 105 .37 .24 .24 .20 29 .47 .41 .30 .32 99 .20 .27 .26 .25 .25 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) NOVEMBER DECEMBER 6.5 7.2 7.0 6.5 7.0 6.6 6.3 0.9 0.5 7.7 0.3 0.3 0.6 9.5 12 1690 70 1300 609 217 773 5.3 104 5.5 5.1 243 210 5.3 4.0 236 15 15 15 15 16 17 10 19 18 10 19 19 19 20 21 01 49 142 99 53 57 10 32 16 14 27 24 12 9 24 .25 .30 .29 .26 .32 .20 .30 .45 .44 .39 .43 .44 .47 .53 .70 772 15 769 200 58 493 .27 45 .26 .20 103 00 .19 .11 €7 4.0 4.3 4.4 5.3 335 5.9 5.8 6.0 6.2 6.5 6.9 6.0 6.3 6.6 6.7 6.6 6.5 7.7 7.0 6.7 7.0 7.0 7.5 7.3 7.2 7.3 7.4 7.7 7.3 7.5 7.5 14 13 12 11 27 12 11 10 10 9 9 9 0 0 0 7 6 6 6 6 5 5 5 5 5 .19 .14 .14 .16 164 .20 .17 .16 .16 .15 .16 .14 .14 .15 .14 .12 .11 .11 .12 .10 .10 .10 .10 .11 .09 .00 .00 .00 .00 .00 .00 TOTAL 2120.9 937.90 5764.9 2704.00 531.9 167.74 292 RIO ORANDE DE LOIZA BASIN 50059050 RIO ORANDE DE LOIZA BELOW DAMSITE LOIZA, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) JANUARY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 7.5 7.6 7.2 7.4 7.6 7.3 7.5 7.4 7.0 7.1 8.0 7.3 7.2 6.6 7.0 7.2 7.3 7.2 6.6 7.2 6.5 7.6 7.0 6.5 6.9 6.1 6.7 6.2 6.4 5.9 6.5 4 5 5 5 5 5 5 5 5 5 5 5 5 6 6 5 5 5 5 5 5 5 6 6 8 9 .09 .09 .07 .08 .08 .09 .11 .10 .09 .09 .10 .09 .10 .08 .09 .09 .09 .09 .10 .10 .09 .09 .09 .09 .09 .09 .09 .09 .10 .14 .14 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) FEBRUARY 6.2 6.5 6.9 6.3 6.6 5.8 6.2 6.1 6.0 6.0 6.4 6.9 11 13 13 11 10 9.5 8.8 8.5 141 6.1 5.3 140 4.3 4.1 4.6 4.4 ___ ___ —— 9 9 9 10 10 10 10 10 11 11 12 14 14 14 15 16 17 17 18 18 65 71 67 48 17 10 10 10 ___ .15 .14 .15 .17 .17 .17 .17 .15 .16 .17 .20 .26 .41 .51 .50 .48 .43 .43 .42 .40 38 1.1 .94 36 .19 .11 .11 .10 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) MARCH 4.1 131 4.4 4.7 4.2 4.8 5.4 4.9 5.8 4.5 5.4 4.6 5.1 4.9 4.8 5.2 4.3 4.7 4.6 4.1 4.4 4.2 3.9 3.3 3.0 2.8 2.9 2.9 3.5 3.1 3.5 10 26 16 9 8 8 7 7 7 7 7 6 6 6 5 5 5 5 5 4 4 4 3 2 2 2 2 2 2 3 3 .11 44 .18 .11 .09 .09 .09 .09 .09 .09 .09 .08 .09 .07 .05 .06 .05 .05 .05 .04 .04 .04 .03 .01 .01 .01 .01 .01 .02 .03 .03 TOTAL 217.5 2.92 470.5 82.19 259.0 45.81 RIO GRANDS OB LOIZA BASIN 293 50059050 RIO GRANDS DB LOIZA BELOW DAHSITB LOIZA, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 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) (MO/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 3.1 3.1 3.6 3.5 4.0 3.8 .0 .6 .2 .2 .6 .3 .1 .0 .3 3.9 3.9 3.7 3.1 5.0 5.1 4.7 4.2 3.6 2.8 2.5 2.7 2.5 2.4 3.4 —— APRIL 5 5 5 5 5 5 5 5 5 4 4 4 4 3 3 3 3 4 4 4 4 5 6 7 9 —— MAY .04 .04 .04 .04 .04 .05 .05 .05 .05 .07 .07 .05 .05 .05 .04 .04 .04 .04 .03 .04 .04 .04 .04 .04 .04 .03 .04 .04 .04 .08 —— 2.5 1.9 1.6 1.6 1.7 1.8 2.0 2.1 2.1 2.0 1.9 1.8 1.8 1.9 1.8 3.0 2.1 1.7 1.5 1.8 1.5 2.1 1.9 2.2 2.5 2.1 2.1 2.1 2.4 2.2 1.8 10 10 12 14 16 18 19 21 25 30 39 41 42 43 45 46 48 50 51 52 54 56 58 59 60 60 62 64 65 66 67 .07 .05 .05 .05 .07 .09 .10 .12 .13 .16 .22 .20 .19 .19 .21 .40 .26 .24 .20 .24 .23 .28 .30 .36 .36 .36 .32 .35 .40 .38 .32 JUNE 1.9 2.1 2.1 1.6 1.5 1.4 1.5 1.4 1.9 2.1 2.0 2.0 2.2 1.9 2.4 2.2 2.7 2.6 1.8 1.6 1.4 1.7 2.0 2.3 2.6 2.7 2.5 1.5 1.6 1.5 —— 69 70 71 72 74 75 75 76 75 75 74 72 71 71 70 69 67 66 65 65 66 61 59 57 55 52 49 47 44 41 —— .37 .38 .37 .36 .26 .30 .30 .28 .36 .38 .38 .36 .37 .39 .40 .42 .44 .44 .32 .27 .26 .27 .33 .31 .35 .35 .31 .21 .17 .16 TOTAL 115.9 1.35 61.5 6.90 58.7 9.87 294 RIO GRANDS DE LOIZA BASIN 50059050 RIO ORANDB DE LOIZA BELOW DAMSITE LOIZA, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CFS) (MO/L) (TONS/DAY) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 16 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL YEAR 2.1 2.4 2.1 1.6 1.7 2.5 2.0 1.9 1.6 1.6 1.5 1.4 1.5 1.4 1.3 1.2 1.2 1.4 1.5 2.1 2.7 2.6 2.0 1.6 1.4 1.0 1.2 .99 .68 • .80 e.74 50.31 13802.27 JULY 37 33 29 25 22 17 15 13 11 10 6 5 7 8 9 10 10 12 12 12 14 15 14 15 15 15 15 15 15 15 15 —— .17 .21 .16 .12 .09 .10 .08 .06 .05 .04 .03 .01 .02 .04 .04 .04 .04 .04 .04 .06 .10 .11 .07 .06 .05 .04 .05 .04 .04 .04 .02 2.06 7877.42 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) AUGUST .74 .68 .62 .62 .58 .56 .60 .56 .54 .50 .49 .49 .48 .48 .50 .48 .49 .50 .48 .49 .49 .49 9.4 9.4 3.0 1.9 1.7 20 6.0 3.0 2.3 68.56 15 14 14 14 14 13 13 12 11 11 10 8 7 6 5 4 4 3 2 2 1 1 8 15 9 8 5 15 15 6 6 .02 .02 .02 .02 .02 .02 .02 .02 .02 .02 .02 .02 .01 .01 .01 .01 .01 .01 .01 .01 .01 .01 .83 .57 .07 .04 .02 2.0 .30 .05 .04 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) SEPTEMBER 3.0 2.5 2.4 2.2 2.2 2.5 2.9 3.0 2.5 3.1 11 11 12 11 7.2 5.3 4.4 4.1 4.2 3260 652 4.6 56 3.3 el. 7 el. 7 el. 6 el. 8 el. 7 el. 7 5 5 5 5 5 5 5 4 4 7 21 22 21 20 19 19 18 17 16 103 47 10 16 13 8 6 5 5 5 4 .04 .04 .04 .04 .04 .03 .04 .04 .02 .06 .63 .66 .66 .59 .39 .27 .20 .17 .18 3380 517 .12 10 .14 e.04 e.03 e.02 e.02 e.02 e.02 4.17 4082.6 3911.55 e Estimated RIO QRANDE DE LOIZA BASIN 50059100 RIO GRANDE DE LOIZA BELOW TRUJILLO ALTO, PR WATBR-QDALITY RECORDS LOCATION.--Lat 18°21'35", long 66°00'15", 100 ft (30 m) downstream of Highway 181 bridge, 0.4 mi (0.6 km) northwest of Trujillo Alto plaza, and 2.2 mi (3.5 km) northeast of Lago Loiza Reservoir. DRAINAGE AREA.--213 mi' (552 km1 ). PERIOD OP RECORD.—Water years 1981 to current year. REMARKS: Flow controlled by Lago Loiza reservoir. WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 295 OCT 12 DEC 20 FEB 22 APR 29 JDN 20 ADG 10 OCT 12 DEC 20 FEB 22 APR 29 JDN 20 AUG 10 OCT 12 DEC 20 FBB 22 APR 29 JDN 20 ADG 10 DATE 1993 . . . 1994 . . . DATE 1993 1994 . . . DATE 1993 1994 TIME 1020 1420 0835 0805 1035 0800 HARD- NESS TOTAL (MG/L AS CACO3) 110 -- -- 120 -- 180 SILICA, DIS- SOLVED (MG/L AS SI02) 26 -- -- 28 -- 32 DIS- CHARGE, INST. CUBIC FEET PER SECOND 11 12 16 8.7 2.6 2.3 CALCIUM DIS- SOLVED (MG/L AS CA) 27 -- -- 28 -- 44 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 194 -- -- 225 -- 315 SPE- CIFIC CON- DUCT- ANCE (US/CM) 311 235 375 376 423 475 MAGNE- SIUM, DIS- SOLVED (MG/L AS MO) 10 -- -- 12 -- 16 SOLIDS, DIS- SOLVED (TONS PER DAY) 5.82 -- -- 5.31 — 1.92 PH WATER WHOLE FIELD (STAND- ARD UNITS) 8.0 7.8 7.7 7.9 7.6 7.3 SODIUM, DIS- SOLVED (MG/L AS NA) 24 -- -- 31 -- 39 RESIDUE TOTAL AT 105 DBG. C, SUS- PENDED (MG/L) <1 2 4 4 5 4 TEMPER- ATURE WATER (DEG C) 30.5 29.0 25.0 28.0 30.0 27.5 SODIUM AD- SORP- TION RATIO 1 -- — 1 -- 1 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) <0.20 0.30 0.30 -- 0.50 0.30 TUR- BID- ITY (NTU) 0.40 3.0 0.40 0.30 1.0 0.50 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 3.0 -- -- 2.9 -- 1.8 PHOS- PHORUS TOTAL (MG/L AS P) 0.130 0.180 0.130 -- 0.190 0.050 OXYGEN, DIS- SOLVED (MG/L) 7.1 6.9 4.0 5.6 0.8 4.0 ALKA- LINITY WAT WH TOT FET FIELD MG/L AS CACO3 110 110 130 120 150 190 ARSENIC TOTAL (UG/L AS AS) 1 -- — <1 -- — OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 93 89 47 70 10 50 SULPIDE TOTAL (MG/L AS S) <0.5 -- -- <0.5 -- — — BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 -- -- 100 -- -- OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 13 <10 33 <10 19 10 SULFATE DIS- SOLVED (MG/L AS SO4) 16 -- — 18 -- 22 BORON, TOTAL RECOV- ERABLE (UG/L AS B) 30 — -- 50 — — COLI- PORM, FECAL, 0.45 UM-MF (COLS./ 100 ML) 440 570 120 K140 290 82 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 22 -- -- 33 -- 46 CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- <1 -- -- STREP- TOCOCCI FECAL, (COLS. PER 100 ML) 310 440 140 K45 210 290 FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.20 -- -- 0.10 -- 0.20 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) <1 _- -- <1 -- -- K = non-ideal count 296 RIO GRANDB DB LOIZA BASIN 50059100 RIO GRANDB DB LOIZA BELOW TRUJILLO ALTO, PR--Continued HATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE OCT 1993 12. .. DEC 20. .. FBB 1994 22... APR 29. .. JUN 20. .. AUG 10. .. COPPER, TOTAL RECOV- ERABLE (UG/L AS CO) <10 -- — 20 -- -- IRON, TOTAL RECOV- ERABLE (UG/L AS RE) 40 -- -- 70 -- -- LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) <1 — -- <1 -- -- MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) <10 -- -- 40 _- -- MERCURY TOTAL RECOV- ERABLE (UG/L AS HG) <0.10 -- — <0.10 -- -- SELE- NIUM, TOTAL (UG/L AS SB) <1 -_ -- <1 -- -- SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) <1 -- — <1 -_ -- ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) <10 -- -- <10 -- -- CYANIDE TOTAL PHENOLS (MG/L TOTAL AS CN) (UG/L) <0.010 <1 — __ <0.010 <1 __ __ MBTHY- LENB BLUB ACTIVE SUB- STANCE (MG/L) 0.02 -- -- 0.03 -- -- RIO GRANDS DE LOIZA BASIN 50061000 RIO GRANDS DB LOIZA AT CAROLINA, PR 297 LOCATION.--Lat 18°22'39", long 65°57'08", Hydrologic Unit 21010005, on upstream right bank of Highway 3 bridge, at Km 11.5, 0.5 mi (0.8 km) southeast of Carolina Plaza, 3.3 mi (5.3 km) west of Canovanaa Plaza and 2.5 mi (4.0 km) southwest of Cerro San Jose, and 8.8 mi (14.2 km) downstream from Rio Grande de Loiza mouth. DRAINAGB AREA.--243 mi> (629 km 1 ). WATER-STAGE RBCORDS PERIOD OP RECORD.--January 1991 to current year. GAGS.—Water-stage recorder. Elevation of gage is 32.8 ft (10.0 m), from topographic map. REMARKS.--Flow regulated by Lago Loiza Dam and also by tidal changes. Gage-height and precipitation satellite telemetry at station. EXTREMES FOR PERIOD OF RECORD.--Maximum gage-height, 33.18 ft (10.113 m), Jan. 6, 1992; minimum, 3.91 ft (1.192 m), Aug. 6, 1991. EXTREMES FOR CURRENT YEAR.--Maximum gage-height, 17.38 ft (5.297 m), September 20; minimum 4.26 ft (1.298 m), December 12. GAGE HEIGHT, FEET, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN AUG SEP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN MAX MIN 6.05 6.12 5.28 6.01 5.31 5.87 6.21 5.51 5.25 5.32 5.35 5.38 5.33 5.34 5.29 5.84 5.87 5.27 5.11 5.15 5.56 5.26 5.14 5.26 5.39 6.14 5.22 5.12 5.09 5.22 5.08 5.46 6.21 5.08 5.15 5.10 5.20 5.19 5.24 5.23 5.27 5.34 5.42 5.42 5.45 5.39 5.43 5.43 5.82 8.56 6.30 7.55 7.78 6.46 7.21 5.34 6.01 5.17 5.17 6.14 5.59 5.63 5.12 5.96 --- 5.80 8.56 5.10 5.36 5.11 5.18 5.25 6.05 5.06 5.01 4.98 5.13 5.09 4 .99 5.04 5.19 5.36 5.23 5.16 5.07 5.64 5.67 5.45 5.04 .98 .93 .88 .80 .85 .88 5.01 4.97 5.06 5.10 5.15 6.05 4.80 5.18 5.30 5.19 5.22 5.26 5.25 5.37 5.17 5.12 5.07 5.30 5.38 5.36 5.17 5.13 5.19 5.34 5.42 5.49 5.55 5.63 5.64 5.60 5.48 5.35 5.30 5.28 5.32 5.46 5.62 5.76 5.35 5.76 5.07 5.92 6.03 6.12 6.22 6.30 6.34 6.37 6.41 6.44 6.46 6.51 6.57 6.61 6.67 6.53 5.40 5.52 5.70 5.87 6.08 6.86 5.46 5.24 5.99 5.30 5.22 5.23 5.21 ___ ___ --- 6.02 6.86 5.21 5.26 6.23 5.33 5.09 5.33 5.68 5.88 6.08 6.21 6.37 6.42 6.15 6.13 6.16 6.14 6.29 6.42 6.54 6.61 6.66 6.75 6.82 6.65 5.43 5.18 5.30 5.43 5.54 5.64 5.77 5.89 5.98 6.82 5.09 5.97 6.05 6.11 6.19 6.25 6.33 6.41 6.48 6.53 6.63 6.32 5.31 5.19 5.19 5.05 5.06 5.11 5.20 5.36 5.49 5.60 5.70 5.76 5.80 5.88 5.96 6.02 6.08 6.13 6.16 --- 5.84 6.63 5.05 6.19 6.22 6.24 6.24 6.26 6.30 6.30 6.29 6.29 6.35 6.22 5.14 5.02 4.99 5.02 5.10 5.16 5.22 5.27 5.32 5.34 5.36 5.40 5.41 5.41 5.42 5.45 5.46 5.46 5.47 5.48 5.64 6.35 4.99 5.51 5.52 5.53 5.62 5.69 5.97 6.32 6.39 5.98 4.96 4.89 4.90 4.91 4.94 4.94 4.99 5.13 5.23 5.19 5.13 5.07 5.03 5.01 5.08 5.16 5.27 5.25 5.29 5.34 5.39 --- 5.32 6.39 4.89 5.43 5.49 5.59 5.65 5.69 5.76 5.84 5.69 5.11 5.04 5.09 5.12 5.16 5.13 5.10 5.09 5.06 5.07 5.12 5.19 5.21 5.22 5.18 5.19 5.17 5.22 5.24 5.27 5.33 5.35 5.37 5.30 5.84 5.04 5.43 5.48 5.55 5.59 5.63 5.63 5.61 5.60 5.62 5.64 5.68 5.70 5.70 5.69 5.68 5.68 5.69 5.73 5.39 5.34 5.41 5.52 5.62 6.13 5.47 5.35 5.32 5.34 5.45 5.40 5.40 5.56 6.13 5.32 5.45 5.42 5.45 5.54 5.62 5.69 5.77 5.86 5.93 5.97 6.00 6.03 6.05 6.08 6.14 6.23 6.29 6.30 6.08 8.73 7.03 5.41 5.90 5.56 5.15 5.26 5.40 5.36 5.40 5.39 --- 5.88 8.73 5.15 295 RIO GRANDB DE LOIZA BASIN 50061800 RIO CANOVANAS NEAR CAMPO RICO, PR LOCATION.--Lat 18°19'08", long 65°53'21", Hydrologic Unit 21010005, at upstream side of bridge, on paved secondary road, 0.4 mi (0.6 km) northeast of junction of Highways 185 and 186, 1.5 mi (2.4 km) south of Campo Rico, and 4.4 mi (7.1 km) south of Loiza. DRAINAGE AREA.--9.84 mi 1 (25.48 km1 ). 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 REMARKS.--Records fair except those for estimated daily discharges, which are poor. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY OCT NOV 1 29 4.3 2 16 4.1 3 11 3.9 4 10 4.1 5 9.8 e3 . 9 6 10 3.6 7 14 3.4 8 10 5.4 9 7.2 10 10 6.2 9.6 11 5.8 5.8 12 5.4 4.9 13 5.0 5.9 14 4.9 28 15 4.8 148 16 5.1 272 17 7.1 70 18 8.9 71 19 6.5 61 20 7.9 27 21 6.6 25 22 9.6 17 23 11 15 24 6.9 e!9 25 5.2 e28 26 4.8 e72 27 5.3 e23 28 9.3 e!4 29 6.6 e!3 30 4.9 14 31 4.2 - — TOTAL 259.0 985.9 MEAN 8.35 32.9 MAX 29 272 MIN 4.2 3.4 AC-FT 514 1960 CFSM .85 3.34 IN. .98 3.73 DEC 13 11 11 10 11 11 9.6 9.0 8.4 8.4 8.1 7.8 7.6 8.3 10 9.2 8.0 15 13 15 ell 9.3 7.6 e7.2 e7.0 e9.0 e!5 17 ell 9.1 7.4 315.0 10.2 17 7.0 625 1.03 1.19 STATISTICS OF MONTHLY MEAN DATA MEAN 42.8 45.9 MAX 273 125 (WY) 1971 1985 MIN 6.74 6.66 (WY) 1968 1981 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN-DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE INSTANTANEOUS LOW FLOW ANNUAL RUNOFF (AC-FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 33.7 116 1971 5.82 1968 FOR JAN 8.0 14 10 e9.0 7.8 e7.0 e6.2 e6.3 6.2 6.6 20 16 9.8 13 9.2 8.4 7.9 9.2 7.7 10 10 9.4 8.2 7.0 6.6 6.1 6.2 6.7 22 14 9.0 297.5 9.60 22 6.1 590 .98 1.12 FBB 8.1 8.7 7.9 7.3 8.5 6.6 6.5 6.4 6.0 6.1 5.7 5.3 5.3 5.6 e6.6 6.2 5.9 5.4 5.4 89 29 29 11 12 8.8 9.3 14 e!3 ___ ___ --- 338.6 12.1 89 5.3 672 1.23 1.28 FOR WATER YEARS 1967 23.8 62.4 1969 6.66 1977 19.1 48.4 1988 4.04 1977 MAR 6.8 10 elO 6.3 5.2 10 14 e5.7 7.2 6.7 6.2 8.4 7.2 4.9 4.6 4.7 4.2 3.6 3.5 3.3 3.5 3.3 3.1 e3.4 3.1 3.5 2.9 2.9 3.5 3.6 3.5 168.8 5.45 14 2.9 335 .55 .64 - 1994 14.1 36.2 1969 3.54 1977 1993 CALENDAR YEAR 7011.8 19.2 701 3.4 3.9 13910 1.95 26.51 29 9.6 5.9 Jul 11 Nov 7 Nov 1 APR 3.1 3.1 3.0 3.1 e3.4 3.1 3.1 3.4 3.3 4.0 11 11 5.4 5.5 6.9 8.3 7.2 6.3 4.3 3.3 2.7 2.6 2.6 2.7 2.5 2.6 2.6 3.6 4.2 2.9 130.8 4.36 11 2.5 259 .44 .49 , BY WATER 15.6 53.2 1971 4.36 1994 MAY 2.7 2.5 e2.6 2.5 2.7 3.5 3.8 e3.8 22 66 e40 10 5.9 6.9 e32 5.5 11 5.5 e9.9 3.8 3.6 3.2 3.0 3.1 3.1 3.1 2.9 3.1 2.8 2.4 2.6 275.5 8.89 66 2.4 546 .90 1.04 YEAR (WY) 29.7 93.2 1969 4.28 1974 JUN 2.7 2.8 32 26 5.7 83 12 5.6 4.3 4.2 3.9 8.0 4.8 4.1 3.7 6.9 26 e21 e9.0 e5.9 e4.9 e4.8 5.0 4.5 4.0 6.7 6.0 4.8 5.4 9.1 --- 326.8 10.9 83 2.7 648 1.11 1.24 18.8 63.7 1970 2.80 1974 FOR 1994 WATER YEAR 3829.1 10.5 272 2.4 2.6 1210 6.76 2.3 7600 1.07 14.48 15 6.2 3.1 Nov 16 May 30 Apr 21 Nov 16 Nov 16 May 2 JUL 8.9 5.4 4.8 4.4 4.3 5.9 6.6 5.8 4.6 4.1 4.0 3.8 3.5 3.2 3.3 3.1 3.0 7.9 8.9 4.3 3.5 3.6 3.5 3.1 3.4 2.8 2.7 2.9 4.0 4.4 6.0 139.7 4.51 8.9 2.7 277 .46 .53 18.7 63.7 1979 3.72 1974 WATER 26 58 10 3160 1 15000 13 19510 2 37 43 12 5 AUG 7.5 6.2 4.0 3.5 3.0 3.2 3.1 3.4 3.0 3.0 5.3 4.8 3.4 2.9 2.9 2.8 3.0 3.5 14 5.6 3.5 2.9 6.1 14 26 7.4 4.6 8.2 24 6.8 4.2 195.8 6.32 26 2.8 388 .64 .74 25.4 137 1979 5.69 1991 YEARS 1967 .9 .0 .5 Oct .80 Jul .5 Jul Sep .10 Sep .80 Jul .74 .18 .1 SEP 3.9 3.4 5.4 5.2 3.9 4.2 9.1 9.2 6.9 9.3 8.8 5.5 4.1 4.7 5.6 5.5 8.5 5.6 14 176 28 10 9.3 12 7.4 6.7 7.7 5.5 6.0 4.3 395.7 13.2 176 3.4 785 1.34 1.50 31.7 103 1979 5.20 1967 - 1994 1971 1994 9 1970 24 1977 18 1977 13 1982 13 1982 24 1977 e Estimated 299 Mop area • ^uiSlTT-^——— . M*YASUO C*»U*S K rowce EXPLANATION ; JJL AQ670 SURFACE-WATER STATION AND NUMBER To725 QUALITY-OF-WATER STATION AND NUMBER 01 23456 KILOMETERS I l.l II_j_l _ I t~ l r I 01234 Figure 21.--Northeastern river basins the Rfo Herrera to Rio Anton Rufz basins. 300 RIO ESPIRITU SANTO BASIN 50063440 QUBBRADA SONADORA NEAR EL VERDE, PR LOCATION.--Lat 18°19'24", long 65°49'03", Hydrologic Unit 21010005, in Caribbean National Forest, at El Yungue, 0.6 mi (1.0 km) upstream from Rio Bspiritu Santo, 0.2 mi (0.3 km) upstream from Highway 186, and about 1.2 mi (1.9 km) south of El Verde. DRAINAGE AREA.--1.01 mi* (2.62 km 1 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.—March 1983 to current year. GAGE.—Water-stage recorder and crest-stage gage. Elevation of gage is 1,230 ft (375 m), from topographic map. REMARKS.--Records poor. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY OCT NOV DEC JAN FBB MAR APR JUN AUG SEP 1 2.0 .06 2 1.0 .04 3 1.5 .03 4 1.1 .02 5 .83 .01 6 4.4 .01 7 5.7 .01 8 1.3 4.4 9 1.1 5.1 10 .59 1.2 11 .46 .35 12 .76 .18 13 .56 8.0 14 .23 9.0 15 .17 32 16 2.9 22 17 4.4 8.4 18 1.1 36 19 2.9 3.2 20 8.9 2.0 21 2.3 .78 22 40 .57 23 8.5 .36 24 2.3 .34 25 .44 .18 26 .65 7.9 27 .44 .62 28 .45 .10 29 .16 1.0 30 .07 2.8 31 .05 —— TOTAL 97.26 146.66 MEAN 3.14 4.89 MAX 40 36 MIN .05 .01 AC-FT 193 291 CPSM 3.11 4.84 IN. 3.58 5.40 STATISTICS OF MONTHLY MEAN MEAN 5.95 10.3 MAX 17.1 20.1 (WY) 1986 1985 MIN .22 2.47 (WY) 1993 1991 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN-DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE INSTANTANEOUS LOW FLOW ANNUAL RUNOFF (AC-FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS .55 .22 .10 .86 1.0 .53 .05 .02 .02 .01 .01 .01 .01 .01 .01 .01 .01 3 .0 14 35 3.4 .57 .34 .41 .38 .36 18 13 1.5 2.3 2.5 98.19 3.17 35 .01 195 3.14 3.62 DATA 7.95 21.6 1988 .95 1990 FOR 17 30 5.3 3.6 4.8 2.0 1.6 1.6 4.8 6.0 16 5.3 5.0 7.8 1.4 3.0 5.4 2.0 1.3 11 5.9 1.7 1.1 .81 .76 .61 .59 2.7 18 3.8 1.0 171.87 5.54 30 .59 341 5.49 6.33 5.9 3.6 1.3 5.6 2.5 .93 1.1 1.0 .54 .51 .29 .24 .15 2.7 .59 4.6 .52 7.9 39 62 3.9 19 3.5 2.7 2.7 5.0 1.9 1.2 ___ ___ 180.87 6.46 62 .15 359 6.40 6.66 FOR WATER YEARS 1983 6.51 10.8 1988 3.41 1985 6.33 12.0 1988 1.59 1992 1.1 28 4.0 1.7 1.3 1.1 1.0 .91 .83 .90 3.1 9.1 1.2 .66 .48 .34 .20 .11 .08 .06 .05 .04 .04 .03 .03 .03 .02 .02 .05 .02 .01 56.51 1.82 28 .01 112 1.80 2.08 - 1994 5.29 14.7 1990 1.59 1993 1993 CALENDAR YEAR 1802.81 4.94 73 .00 .01 3580 4.89 66.40 14 .55 .02 May 2 Aug 14 Dec 10 .01 .01 .01 .01 .00 .00 .58 .02 .00 26 37 13 .52 3.8 14 16 19 7.4 e.70 e.26 e.13 .12 .08 .07 .06 .06 .05 .05 .05 .05 --- 139.04 4.63 37 .00 276 4.59 5.12 , BY WATER 5.16 9.99 1987 1.09 1984 FOR 1994 1492. 4. 62 . 608 7. 2960 4. 54. 10 1. .05 .05 .05 .05 9.8 3.1 .78 1.2 13 17 4.5 1.2 .82 26 8.4 3.8 2.3 1.7 1.2 e.86 e.74 e.62 e.54 e.50 e.47 .41 .40 .35 e.25 e.25 e.27 100.66 3.25 26 .05 200 3.21 3.71 YEAR (WY) 8.20 15.9 1992 3.25 1994 el.O .45 4.6 1.6 3.8 23 2.0 .87 .65 .55 1.4 1.2 .73 .51 2.0 2.2 33 12 3.6 1.9 1.3 1.0 .80 .67 2.1 41 4.1 2.1 3.3 31 184.43 6.15 41 .45 366 6.09 6.79 5.86 13.7 1987 .98 1985 WATER YEAR 42 09 00 01 20 00 05 97 1 05 Feb 20 Apr 5 Mar 31 Oct 22 Oct 22 Dec 17 4.4 3.0 3.3 2.2 2.3 9.2 3.6 3.5 1.8 1.3 1.1 .88 .75 .69 .64 .64 .64 22 2.2 1.1 .87 .74 .66 .61 .57 .54 .56 .89 1.9 .99 4.6 78. 17 2.52 22 .54 155 2.50 2.88 6.49 12.8 1983 2.36 1991 2.0 .72 .56 .53 .53 .58 .63 .54 .52 4.7 1.5 .57 .50 1.2 .60 .50 .49 15 6.8 1.1 .64 1.3 12 10 8.6 1.6 2.9 3.5 1.4 .82 .65 82.98 2.68 15 .49 165 2.65 3.06 6.76 14.5 1988 .53 1993 WATER YEARS 1983 6.67 9.48 4.09 216 .00 .01 2230 9.42 .00 4830 6.61 89.77 17 2.7 .41 Dec Aug Mar Dec Dec Aug .69 .98 .82 .57 .56 5.8 8.8 7.0 2.7 12 4.1 1.5 1.0 .86 5.1 7.3 3.0 2.8 7.0 46 6.9 6.4 6.5 5.2 3.1 2.5 2.0 1.7 1.5 1.4 155.78 5.19 46 .56 309 5.14 5.74 6.33 15.6 1989 2.34 1986 - 1994 1988 1994 7 1987 14 1993 31 1994 7 1987 7 1987 14 1993 e Estimated RIO BSPIRITU SANTO BASIN 50063500 QUBBRADA TORONJA AT BL VERDE, PR LOCATION.--Lat 18°19'43", long 65°49'14", Hydrologic Unit 21010005, in Caribbean National Forest, at downstream side of culvert on Highway 186, 0.2 mi (0.3 km) upstream from Rio Bspiritu Santo, and about 0.9 mi (1.4 km) south of El Verde. DRAINAGE AREA.--0.064 mi> (0.166 km'). HATER-DISCHARGE RECORDS PERIOD OP RECORD.--April 1983 to current year. GAGE.--Hater-stage recorder, crest-stage gage and concrete broad-V-notch crested weir. Elevation of gage is 876 ft (267 m), from topographic map. REMARKS.--Records poor. Gage-height satellite telemetry at station. DISCHARGE, CUBIC FEET PER SECOND, HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES 307 DAY NOV JAN MAR MAY JUN JUL AUG SEP 1 e.03 .05 2 e.Ol .04 3 e.Ol .03 4 e.02 .03 5 e.02 .04 6 e.02 .03 7 e.02 .02 8 e.02 .10 9 e.02 .14 10 e.Ol .05 11 e.Ol .06 12 e.Ol .04 13 e.Ol .05 14 e.Ol .15 15 e.Ol el. 3 16 e.Ol el. 2 17 e.02 e.72 18 e.02 e2.0 19 e.Ol e.16 20 e.02 e.10 « 21 e.02 e.08 22 el. 4 e.06 23 e.13 e.03 24 e.02 e.02 25 e.02 e.Ol 26 e.02 e.50 27 e.Ol e.07 28 e.Ol e.05 29 e.03 e.05 30 e.04 e.07 31 e.05 --- TOTAL 2.06 7.25 MEAN .066 .24 MAX 1.4 2.0 MIN .01 .01 AC-PT 4.1 14 CPSM 1.11 4.03 IN. 1.28 4.49 STATISTICS OP MONTHLY MEAN MEAN .30 .65 MAX 1.35 1.56 (WY) 1986 1993 MIN .059 .15 (HY) 1992 1991 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN -DAY MINIMUM INSTANTANEOUS PEAK PLOW INSTANTANEOUS PEAK STAGE ANNUAL RUNOPP (AC-PT) ANNUAL RUNOPP (CPSM) ANNUAL RUNOPP (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS e.06 e.09 e.09 e.ll e.ll e.06 e.05 e.05 e.05 e.07 e.02 e.05 e.04 e.06 e.05 e.03 e.04 e.17 e.15 sl.O e.ll e.07 e.08 e.09 e.07 e.07 e.31 e.28 e.07 e.06 e.09 3.65 .12 1.0 .02 7.2 1.96 2.26 DATA .49 1.55 1993 .091 1990 POR e.20 .12 e2.0 .09 e.13 .07 e.06 .07 e.07 .08 e.05 .07 e.07 .10 e.07 .08 e.08 .10 e.08 .08 e.52 .07 e.17 .08 e.13 .07 e.16 .14 e.08 .10 e.10 .13 e.12 .10 e.06 .17 e.07 e2.5 e.19 e4.0 e.12 e.48 e.06 el. 8 e.05 .14 e.06 .08 e.05 .07 e.04 .07 e.05 .04 e.09 .04 e.ll e.09 --- e.08 .03 .07 .03 .03 .01 .02 .02 .01 .02 .01 .02 .04 .00 .01 .00 .01 .01 .01 .00 .01 .01 .02 .01 .01 .01 .01 .01 .01 .01 .01 .02 5.21 10.94 0.49 .17 .39 .016 2.0 4.0 .07 .04 .04 .00 10 22 1.0 2.80 6.51 .26 3.23 6.78 .30 POR HATER YEARS 1983 - 1994 .36 .26 .21 1.39 .44 .63 1993 1988 1990 .14 .092 .016 1986 1987 1994 1993 CALENDAR YEAR 197.65 .54 12 May 2 .01 Apr 7 .01 Oct 10 392 9.03 122.54 1.2 .15 .02 e.OO e.OO e.OO e.OO e.OO e.02 e.Ol e.Ol e.Ol e.83 e.55 e.29 e.07 e.10 e.35 e2.2 el. 4 .29 .10 .09 .08 .08 .07 .07 .08 .09 .08 .06 .06 .06 --- 7.05 .23 2.2 .00 14 3.92 4.37 , BY HATER .21 .61 1987 .035 1984 POR 1994 70 4 28 1 139 3 43 e.06 e.05 .05 e.07 e.15 e.07 e.06 e.06 e.08 e.ll e.05 e.04 e.03 e.33 e.07 e.06 e.06 e.06 e.07 e.06 e.07 e.07 e.07 e.09 e.10 e.09 e.07 e.08 e.09 e.08 e.08 2.48 .080 .33 .03 4.9 1.33 1.54 YEAR (HY) .38 1.17 1993 .080 1994 e.15 e.08 e.15 e.ll e.18 e2.3 e.21 e.22 e.19 e.26 e.32 e.86 e.59 e.83 e.47 e.51 e.33 e.15 e.07 e.23 e.ll e.25 e.29 e.24 e.23 e.78 e.06 e.10 e.12 el. 8 --- 12.19 .41 2.3 .06 24 6.77 7.56 .29 .61 1987 .056 1991 HATER YEAR .05 .19 .5 .00 .00 .87 .20 .43 .29 .08 .01 Sep 20 Mar 13 Mar 30 Oct 22 Oct 22 e.15 e.15 e.25 e.26 e.22 e.08 e.Ol e.03 e.05 e.14 e.15 e.ll e.06 e.03 e.08 e.10 e.09 e.10 e.13 e.15 e.14 e.ll e.12 e.ll e.08 e.08 e.09 e.08 e.12 e.12 e.ll e.18 .09 .08 .09 .10 .10 .08 .12 .31 .16 .13 .14 .12 .14 .15 .08 .09 .23 .18 .14 .11 .15 .60 .31 .21 .12 .18 .15 .13 .11 .09 3.53 4.84 .11 .16 .26 .60 .01 .08 7.0 9.6 1.90 2.60 2.19 3.00 .34 .27 1.70 .54 1993 1988 .046 .054 1991 1993 HATER YEARS 1983 .34 .78 .17 12 May .00 Mar .00 Mar 101 Aug 2.61 Aug 244 5.60 76.13 .70 .14 .05 e.17 e.17 e.13 e.14 e.ll e.21 e.21 e.25 e.18 e.21 e.21 e.14 e.15 e.13 e.21 e.26 e.19 e.17 e.16 e4.5 e.29 e.22 e.79 e.26 e.18 e.14 e.14 e.15 e.14 e.15 --- 10.36 .35 4.5 .11 21 5.76 6.42 .30 .61 1989 .060 1991 - 1994 1993 1984 2 1993 13 1994 30 1994 13 1990 13 1990 e Estimated 302 RIO BSPIRITU SANTO BASIN 50063800 RIO BSPIRITU SANTO NEAR RIO ORANDB, PR LOCATION.--Lat 18°21'37", long 65°48'49", Hydrologic Unit 21010005, at downstream side of bridge on Highway 966, 0.1 mi (0.2 km) upstream from Quebrada Jimenez, and 1.9 mi (3.1 km) southeast of Rio Qrande. DRAINAGE AREA.--8.62 mi' (22.33 km'). WATER-DISCHARGE RECORDS PERIOD OP 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 poor. Gage-height and precipitation satellite telemetry at station. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES OCT NOV DEC JAN PEB MAR APR MAY JUN JUL AUG SEP 1 e25 e6.2 2 e!4 e6.0 3 e!8 e5.6 4 e!7 e5.4 5 ell e5.2 6 e20 e5.1 7 e44 e5.2 8 e!4 e!7 9 e!3 e42 10 elO e32 11 e8.2 e!3 12 e7.6 e!2 13 e7.2 e35 14 e6.6 e90 15 e6.2 e220 16 elO e!90 17 e!8 ellO 18 el6 e!40 19 e9.6 e78 20 e24 e32 21 el? e25 22 e56 e24 23 e30 e22 24 e!2 e23 25 e8.4 e20 26 e8.8 e47 27 e7.4 e35 28 e9.4 e!9 29 e6.8 e!6 30 e6.0 635 31 e5.8 --- TOTAL 467.0 1315.7 MEAN 15.1 43.9 MAX 56 220 MIN 5.8 5.1 AC-FT 926 2610 CFSM 1.75 5.09 IN. 2.02 5.68 e20 e!5 e!4 e!4 e21 e20 e!3 ell elO e9.8 e8.8 e8.5 e8.4 e8.4 e7.8 el. 6 e7.4 e23 e30 e67 e!5 ell e9.2 e8.4 e8.4 e7.4 e30 e64 e!7 e!4 ell 520.1 16.8 67 • 7.4 1030 1.95 2.24 STATISTICS OF MONTHLY MEAN DATA MEAN 61.5 85.6 MAX 202 196 (WY) 1971 1985 MIN 12.3 29.1 (WY) 1969 1982 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN-DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE ANNUAL RUNOFF (AC-FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 73.7 179 1971 16.8 1994 FOR e32 e60 e22 e!7 e!4 ell e9.4 e!2 e!2 e!4 e86 e45 e24 e38 e!6 e!7 e27 e21 e!4 e44 e30 e21 e!4 e!2 e!2 ell elO e38 e90 e37 e!7 827.4 26.7 90 9.4 1640 3.10 3.57 FOR WATER 52.2 119 1969 18.5 1977 e!7 e20 e!7 e21 e!7 e!2 elO e9.8 e8.2 e7.4 e6.8 e6.2 e5.8 e8.4 e9.0 e9.1 e8.4 e6.2 e!3 e340 e26 e25 e!8 e27 e!5 e!4 e20 e!2___ ___ --- 709.3 25.3 340 5.8 1410 2.94 3.06 YEARS 1966 49.3 117 1982 10.8 1983 e9.4 e38 e!6 elO e9.0 e8.3 e8.0 e7.8 e7.8 e8.8 elO e38 el2 e8.8 e8.0 e8.3 e7.4 e7.2 e6.8 e6.6 e6.4 e6.2 e6.6 e6.2 e5.8 e6.0 ell e6.8 e8.8 e9.8 e7.4 317.2 10.2 38 5.8 629 1.19 1.37 - 1994 39.5 153 1990 10.2 1994 1993 CALENDAR YEAR 14019. 38. 500 5. 5. 27810 4. 60. 90 20 9. 0 4 Jul 11 1 Nov 6 5 Nov 1 46 50 8 e6.0 e5.8 e5.S e5.4 e5.6 e5.8 e!4 e!8 e6.8 e25 ellO e74 e!4 e27 e50 e45 e66 e36 e21 e!5 e!4 e!3 e!2 ell elO e9.4 e9.4 e!3 ell e9.2 --- 667.9 22.3 110 5.4 1320 2.58 2.88 , BY WATER 44.3 119 1981 6.27 1984 e8.8 e8.6 e7.8 e8.6 e!5 e23 ell e!6 e45 e!20 e35 e!5 e!4 e58 e48 e!7 e!5 ell e!4 e9.8 e8.8 e8.4 e8.2 e8.0 e7.6 e8.2 e8.0 e7.1 e6.9 e6.6 e7.0 585.4 18.9 120 6.6 1160 2.19 2.53 YEAR (WY) 68.6 185 1979 14.9 1973 e9.2 e7.0 e52 e20 ell e!60 e!9 elO e7.2 e6.4 e!5 e21 elO e8.0 e8.4 e!5 e90 e35 e!5 elO e7.4 e6.6 e6.6 e6.2 e7.0 e58 e!6 e9.6 e21 elOO--- 767.6 25.6 160 6.2 1520 2.97 3.31 46.3 120 1970 10.0 1975 FOR 1994 WATER YEAR 7875.8 21.6 340 5.0 5.5 15620 2.50 33.99 44 12 6.2 Feb 20 Aug 4 Nov 1 e27 e!4 ell e9.6 e9.0 e24 e!9 e!7 e!2 e8.4 e7.2 e6.6 e6.4 e6.0 e9.0 e7.0 elO e54 e20 elO e7.2 e6.2 e6.0 e5.8 e5.8 e5.6 e5.6 6.4 11 8.3 17 372.1 12.0 54 5.6 738 1.39 1.61 51.0 114 1983 11.1 1975 WATER 57 98 21 2600 4 4 19200 15 41780 6 90 123 25 10 10 5.6 5.5 5.0 5.1 5.0 6.7 6.1 7.4 18 16 7.4 7.2 8.8 8.1 6.6 8.0 64 66 17 11 11 64 50 66 15 15 21 20 10 8.5 575.0 18.5 66 5.0 1140 2.15 2.48 59.5 123 1988 18.5 1994 YEARS 1966 - .7 .6 .6 Dec 7 . 1 Jul 3 .4 Jun 30 Aug 13 .74 Aug 13 .69 .90 8.9 8.9 13 9.7 8.6 25 29 41 15 42 21 10 8.2 8.8 14 24 15 11 21 253 26 20 20 e!7 e!6 e!3 e!2 13 13 14--- 751.1 25.0 253 8.2 1490 2.90 3.24 55.7 191 1989 17.7 1971 1994 1979 1994 1987 1975 1975 1990 1990 e Estimated RIO ESPIRITU SANTO BASIN 50063800 RIO ESPIRIT0 SANTO NEAR RIO GRANDE, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORD.--Hater years 1958, 1961-66, 1968 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 303 DATE OCT 1993 22... DEC 08... FEB 1994 18... APR 08.. . JUN 14... AUG 11. .. DATE OCT 1993 22... DEC 08. .. FEB 1994 18. .. APR 08... JUN 14. . . AUG 11... DATE OCT 1993 22. .. DEC 08. .. FEB 1994 18. .. APR 08. .. JUN 14. .. AUG 11. . . TIME 1120 1145 0800 0835 0805 0815 HARD- NESS TOTAL (MG/L AS CACO3) 27 -- -- -- -- 22 SILICA, DIS- SOLVED (MG/L AS SI02) 16 — -- -- -- 16 DIS- CHARGE, INST. CUBIC FEET PER SECOND 33 23 61 26 12 19 CALCIUM DIS- SOLVED (MG/L AS CA) 6.1 -- ... -- -- 5.1 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 70 -- -- -- -- 56 SPE- CIFIC CON- DUCT- ANCE (US/CM) 87 95 126 72 92 110 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 2.9 — — -- -- 2.2 SOLIDS, DIS- SOLVED (TONS PER DAY) 6.23 — — — -- 2.80 PH WATER WHOLE FIELD (STAND- ARD UNITS) 7.3 7.9 7.3 7.1 7.0 6.8 SODIUM, DIS- SOLVED (MG/L AS NA) 7.0 -- -- -- -- 6.3 RESIDUE TOTAL AT 105 DEG. C, SUS- PENDED (MG/L) 13 <1 76 29 <1 6 TEMPER- ATURE WATER (DBG C) 26.5 23.3 22.5 23.0 25.0 27.0 SODIUM AD- SORP- TION RATIO 0.6 -- -- -- — 0.6 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.30 <0.20 0.60 <0.20 <0.20 <0.20 TUR- BID- ITY (NTU) 6.4 1.4 45 -- 1.0 1.6 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 0.80 -- -- -- -- 0.60 PHOS- PHORUS TOTAL (MG/L AS P) 0.030 <0.010 0.090 0.010 <0.010 0.040 OXYGEN, DIS- SOLVED (MG/L) 5.0 8.1 7.2 7.4 4.2 3.6 ALKA- LINITY WAT WH TOT FBT FIELD MG/L AS CAC03 45 89 46 18 30 25 ARSENIC TOTAL (UG/L AS AS) <1 — — <1 -- -- OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 61 95 81 85 50 44 SULFIDE TOTAL (MG/L AS S) <0.5 -- -- <0.5 -- "" BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 -- -- <100 -- -- OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 16 <10 39 — <10 23 SULFATE DIS- SOLVED (MG/L AS S04) 2.2 -- -- -- -- 2.1 BORON, TOTAL RECOV- ERABLE (UG/L AS B) 20 -- -- 20 -- -- COLI- FORM, FECAL, 0.45 UM-MF (COLS./ 100 ML) 280 210 40000 960 210 930 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 8.4 -- -- -- -- 8.4 CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- <1 -- -- STREP- TOCOCCI FECAL, (COLS. PER 100 ML) 350 420 22000 3400 290 530 PLUO- RIDE, DIS- SOLVED (MG/L AS F) <0.10 -- -- -- -- 0.10 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) <1 — — <1 -- -- K = non-ideal count 304 RIO ESPIRITD SANTO BASIN 50063800 RIO BSPIRITD SANTO NEAR RIO GRANDB, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE OCT 1993 22. .. DEC 08. .. FBB 1994 18. .. APR 08... JUN 14. .. AUO 11. . . COPPER, TOTAL RECOV- ERABLE (UO/L AS CD) 10 IRON, LEAD, TOTAL TOTAL RECOV- RECOV- ERABLE BRABLB (DO/L (DO/L MANGA- NESE, MERCURY TOTAL TOTAL RECOV- ERABLE (DO/L RECOV- ERABLE (UO/L SELE- NIUM, TOTAL (DO/L SILVER, TOTAL RECOV- ERABLE (DO/L ZINC, TOTAL RECOV- CYANIDE BRABLB TOTAL (DO/L (MO/L MBTHY- LBNE BLUE ACTIVE PHENOLS SUB- TOTAL STANCE AS FE) AS PB) AS MN) AS HO) AS SB) AS AO) AS ZN) AS CN) (UO/L) 560 400 20 20 <0.10 <0.10 <0.010 <0.010 (MO/L) 0.03 0.03 K = non-ideal count RIO BSPIRITU SANTO BASIN 50064200 RIO GRANDB NEAR EL VERDE, PR LOCATION.--Lat 18°20'54", long 65°50'30", Hydrologic Unit 21010005, on left bank 250 ft (7.6 m) upstream side of bridge at Hwy 960, 0.05 mi (0.08 km) southwest of junction of Highways 956 and 960, 1.1 mi (1.8 km) west of El Verde, and 2.7 mi (4.3 km) south of Rio Grande. 305 DRAINAGE AREA.--7.31 mi 1 (18.93 km» ). HATER-DISCHARGE RECORDS PERIOD OF RECORD.--May 1967 to December 1970, January 1972 to September 1982, August 1990 to current year. GAGE.—Hater-stage recorder. Elevation of gage is 131 ft (40 m), from topographic map. REMARKS.--Records fair. Gage-height and precipitation satellite telemetry at station. DISCHARGE, CUBIC FEET PER SECOND, HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY NOV DEC JAN MAR APR JUN JUL AUG SEP 1 21 5.2 2 12 5.0 3 15 .7 4 14 .5 5 8.9 .4 6 14 .3 7 37 .4 8 12 13 9 11 36 10 8.8 27 11 6.9 11 12 6.3 10 13 6.1 25 14 5.5 87 15 5.2 184 16 8.5 161 17 15 97 18 13 117 19 8.1 66 20 20 40 21 14 28 22 47 20 23 29 20 24 11 17 25 7.1 27 26 7.4 74 27 6.3 30 28 7.9 16 29 5.8 14 30 5.1 28 31 4.8 --- TOTAL 393.7 1180.5 MEAN 12.7 39.3 MAX 47 184 MIN 4.8 4.3 AC-FT 781 2340 CFSM 1.74 5.38 IN. 2.00 6.01 STATISTICS OF MONTHLY MEAN MEAN 61.2 71.8 MAX 392 172 (WY) 1971 1970 MIN 8.45 14.3 (WY) 1969 1981 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN-DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE INSTANTANEOUS LOW FLOW ANNUAL RUNOFF (AC-FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 17 13 12 12 18 17 11 9.1 8.7 8.4 7.5 7.2 7.2 7.1 6.7 6.4 6.3 20 26 58 15 9.6 8.1 7.2 7.2 6.3 25 56 15 12 9.4 449.4 14.5 58 6.3 891 1.98 2.29 DATA 49.7 140 1971 13.8 1968 FOR 28 53 19 15 12 9.5 8.1 10 10 12 76 38 21 33 14 15 23 18 12 38 26 18 12 10 9.9 9.2 8.7 30 78 32 15 713.4 23.0 78 8.1 1420 3.15 3.63 FOR WATER 42.8 151 1969 10.1 1977 15 17 15 18 15 9.9 8.8 8.4 7.1 6.4 5.9 5.4 5.0 7.2 7.6 7.8 7.1 5.4 12 293 22 21 15 23 13 12 17 9.9 ___ ___ --- 609.9 21.8 293 5.0 * 1210 2.98 3.10 YEARS 1967 30.8 76.4 1969 5.80 1977 8.0 33 15 8.9 7.8 7.1 6.8 6.6 6.6 7.4 8.5 32 11 7.4 6.8 6.9 6.4 6.1 5.8 5.6 5.4 5.2 5.5 5.2 4.8 5.1 8.9 5.8 7.3 8.3 6.4 271.6 8.76 33 4.8 539 1.20 1.38 - 1994 21.8 54.4 1969 4.50 1977 1993 CALENDAR YEAR 9254. 25. 373 4. 4. 18360 3. 47. 57 12 6. 9 4 Jul 11 3 Nov 6 6 Nov 1 47 10 3 5.3 4.5 4.2 4.0 4.1 4.6 12 15 5.7 17 90 63 12 20 43 39 57 31 12 9.5 9.2 8.8 8.3 7.6 7.1 6.8 6.8 8.3 7.5 6.1 529.4 17.6 90 4.0 1050 2.41 2.69 5.8 5.6 5.2 5.7 8.8 15 7.4 11 27 79 27 10 9.5 38 32 11 9.6 7.2 9.1 6.5 5.8 5.5 5.4 5.3 5.1 5.4 5.3 4.7 4.5 4.4 4.7 386.5 12.5 79 4.4 767 1.71 1.97 6.0 4.6 34 20 7.1 106 13 7.0 4.7 4.3 9.2 14 6.6 5.3 5.5 10 58 26 10 6.6 .9 .4 .4 .1 .6 38 11 6.3 14 69--- 518.6 17.3 106 4.1 1030 2.36 2.64 19 9.0 7.4 6.4 5.9 16 13 11 8.1 5.6 4.8 4.4 4.2 4.1 3.9 3.8 3.7 30 11 5.2 4.0 3.5 3.3 3.2 3.2 3.1 3.1 3.5 18 10 37 268.4 8.66 37 3.1 532 1.18 1.37 17 6.9 4.8 4.1 3.8 3.2 3.0 3.0 3.0 4.9 6.2 4.4 3.2 4.0 3.5 3.1 3.0 32 47 7.2 4.3 4.0 47 51 52 9.6 6.6 29 24 7.4 5.2 407.4 13.1 52 3.0 808 1.80 2.07 6.1 10 15 6.0 5.3 24 28 44 14 37 22 9.1 6.6 6.3 7.8 21 16 7.5 42 180 13 8.7 7.0 15 7.6 11 8.1 7.4 7.0 6.7 --- 599.2 20.0 180 5.3 1190 2.73 3.05 , BY WATER YEAR (WY) 29.6 119 1978 8.55 1975 FOR 1994 6328. 17. 293 3. 3. 1510 9. 2. 12550 2. 32. 37 8. 4. 56.2 203 1969 10.2 1974 WATER YEAR 0 3 Feb 20 0 Aug 7 3 Jul 22 Feb 20 83 Feb 20 8 Aug 8 37 20 9 4 32.4 86.5 1968 6.22 1975 37.0 109 1969 8.66 1994 WATER 41 87 17 3470 2 2 17400 15 1 30300 5 77 81 17 6 42.9 90.0 1968 7.39 1991 YEARS 1967 .8 .1 .3 May .2 Aug .5 Aug Sep .50 Sep .6 Mar .72 .74 .8 48.1 153 1975 12.4 1967 - 1994 1969 1994 21 1969 15 1991 10 1991 16 1975 16 1975 13 1977 306 RIO MAMEYBS BASIN 50065500 RIO MAMEYBS NEAR SABANA, PR LOCATION.--Lat 18°19'46", long 65°45'04", Hydrologic Onit 21010005, on left bank, at bridge on Highway 988, 1.4 mi (2.3 km) west of Sabana, 2.0 mi (3.2 km) downstream from Rio de la Mina, and 3.2 mi (5.1 km) southeast of Mameyes. DRAINAGE AREA.--6.88 mi 3 (17.82 km 3 ). 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. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY OCT NOV DEC JAN FEE MAR APR JUN AUG SEP 1 e56 24 2 e38 23 3 e56 21 4 e40 21 5 e30 20 6 e44 20 7 63 22 8 38 44 9 34 57 10 34 36 11 34 29 12 42 25 13 30 40 14 26 93 15 24 130 16 74 103 17 69 74 18 41 129 19 50 67 20 53 51 21 38 42 22 125 40 23 83 37 24 48 39 25 36 33 26 39 80 27 43 44 28 49 32 29 32 42 30 28 61 31 25 --- TOTAL 1422 1479 MEAN 45.9 49.3 MAX 125 130 MIN 24 20 AC-FT 2820 2930 CFSM 6.67 7.17 IN. 7.69 8.00 STATISTICS OF MONTHLY MEAN MEAN 67.4 82.8 MAX 240 191 (WY) 1971 1985 MIN 20.3 36.3 (WY) 1969 1974 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN -DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE INSTANTANEOUS LOW FLOW ANNUAL RUNOFF (AC-FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 37 32 28 36 43 35 25 23 23 e23 e21 20 20 20 18 17 17 21 76 119 56 27 23 22 21 23 58 60 27 30 31 1032 33.3 119 17 2050 4.84 5.58 DATA 61.3 164 1971 16.6 1990 FOR 57 73 39 38 38 29 32 31 31 34 66 41 38 44 28 28 38 27 27 36 35 26 e22 e!8 e!9 e!7 e!7 e44 e72 e70 e!8 1133 36.5 73 17 2250 5.31 6.13 30 35 24 42 36 27 30 26 22 21 21 21 20 34 25 42 24 57 509 228 54 80 39 32 31 34 27 23 ___ ___ --- 1594 56.9 509 20 3160 8.27 8.62 FOR WATER YEARS 1967 54.1 105 1969 25.0 1985 41.9 68.0 1988 21.7 1968 24 83 37 23 21 20 19 18 17 18 20 56 20 16 15 14 14 14 13 14 15 14 14 14 14 14 19 22 26 20 15 663 21.4 83 13 1320 3.11 3.58 - 1994 38.4 79.7 1990 18.1 1968 1993 CALENDAR YEAR 19561 53.6 526 17 19 38800 7.79 105.77 94 40 23 Apr 30 Dec 16 Dec 11 17 15 14 13 13 17 24 20 14 39 85 37 18 24 37 65 73 46 21 18 17 15 14 14 14 13 15 15 14 14 --- 755 25.2 85 13 1500 3.66 4.08 14 13 13 16 49 26 16 24 56 97 44 30 21 132 56 69 37 24 20 19 18 18 17 17 19 17 16 16 21 17 19 971 31.3 132 13 1930 4.55 5.25 31 19 28 26 44 63 23 20 18 17 26 21 20 15 24 19 111 54 25 19 16 15 14 15 19 123 23 18 35 64 965 32.2 123 14 1910 4.68 5.22 23 18 23 16 16 30 21 24 16 13 13 13 11 11 9.6 9.0 10 119 19 13 12 11 10 10 e8.8 e!2 e!5 e!9 e30 e!6 e58 629.4 20.3 119 8.8 1250 2.95 3.40 e24 e!5 ell ell e9.2 e30 e!4 ell e9.6 e22 ell e8.5 e7.5 e!2 ell elO elO e49 e45 e30 e20 e23 e43 e37 e39 e20 e23 e27 e20 e!5 e!4 631.8 20.4 49 7.5 1250 2.96 3.42 e!4 e!5 e!3 e!3 e!2 e46 e50 e40 e22 e65 e29 e!7 e!6 e!8 e25 e29 e20 e21 e28 e!39 e30 e21 e21 e!9 e20 e!7 e!5 e!5 e!4 e20 --- 824 27.5 139 12 1630 3.99 4.46 , BY WATER YEAR (WY) 41.1 83.1 1973 14.5 1984 FOR 1994 12099. 33. 509 7. 10 6130 8. 24000 4. 65. 60 23 14 66.7 147 1970 18.7 1973 WATER YEAR 2 1 Feb 19 5 Aug 13 Aug 11 Feb 19 61 Feb 19 82 42 55.8 112 1970 12.4 1985 49.9 93.4 1969 20.3 1994 WATER 56. 78. 33. 2780 6. 9. 20500 13. 5. 40840 8. 111. 102 33 16 52.8 81.4 1988 20.4 1994 YEARS 1967 - 4 0 1 Sep 18 9 Apr 20 4 Jun 12 Sep 18 91 Sep 18 1 Apr 8 19 34 55.8 166 1989 26.6 1986 1994 1971 1994 1989 1970 1985 1989 1989 1970 e Estimated 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. 307 DRAINAGE AREA.--3.96 mi 2 (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 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. Gage-height and precipitation satellite telemetry at station. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY OCT NOV DEC JAN FBB JUN AUG SEP 1 13 6.3 2 8.1 5.9 3 10 5.7 4 11 5.6 5 6.5 5.6 6 6.6 5.6 7 9.4 6.0 8 7.9 7.2 9 6.3 8.0 10 7.1 6.1 11 12 5.8 12 11 5.5 13 6.6 6.3 14 5.3 16 15 5.2 38 16 31 39 17 13 19 18 10 33 19 27 17 20 16 9.1 21 8.6 7.5 22 38 6.7 23 77 6.5 24 14 8.8 25 13 6.6 26 12 23 27 8.9 14 28 8.1 7.0 29 7.2 11 30 6.7 18 31 6.3 —— TOTAL 422.8 359.8 MEAN 13.6 12.0 MAX 77 39 MIN 5.2 5.5 AC-FT 839 714 CFSM 3.44 3.03 IN. 3.97 3.38 STATISTICS OF MONTHLY MEAN MEAN 21.3 31.1 MAX 66.4 79.7 (WY) 1986 1988 MIN 6.48 8.15 (WY) 1983 1981 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN-DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE INSTANTANEOUS LOW FLOW ANNUAL RUNOFF (AC-FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 7.7 7.1 5.7 13 12 6.7 5.8 5.3 5.6 5.6 5.1 4.9 4.9 4.8 4.6 4.4 4.3 4.7 34 46 11 6.9 5.3 4.9 4.7 5.3 13 20 6.4 6.1 6.2 282.0 9.10 46 4.3 559 2.30 2.65 DATA 24.2 64.1 1982 3.92 1990 FOR 18 23 11 6.8 12 7.6 6.0 6.4 6.0 6.7 11 7.4 10 11 6.3 6.0 7.4 6.0 5.2 5.0 7.2 5.4 4.6 4.3 4.2 4.2 4.1 6.5 27 8.1 4.6 259.0 8.35 27 4.1 514 2.11 2.43 FOR WATER 12.9 33.0 1992 6.12 1986 5.0 5.1 4.1 10 5.3 3.9 4.5 4.1 3.0 2.6 2.5 2.3 2.1 2.3 2.0 2.7 1.9 12 259 70 7.6 14 4.7 3.9 4.0 3.7 3.6 3.3 ___ ___ --- 449.2 16.0 259 1.9 891 4.05 4.22 YEARS 1980 12.1 22.2 1988 2.94 1983 3.8 6.6 4.0 2.7 2.5 2.3 2.2 2.1 2.0 2.2 2.6 9.5 3.2 2.6 2.2 2.3 2.4 2.6 2.5 2.1 2.0 2.1 2.0 2.1 1.9 1.8 1.8 1.8 2.2 2.0 1.8 83.9 2.71 9.5 1.8 166 .68 .79 - 1994 11.5 36.0 1987 2.71 1994 1993 CALENDAR YEAR 5826. 16. 278 1. 2. 11560 4. 54. 28 8. 3. 3 0 Apr 30 9 Apr 25 2 Apr 21 03 73 1 6 1.9 2.5 2.4 2.2 2.0 e2.5 e3.4 e2.8 e2.3 e5.6 e!2 e5.2 e2.4 2.0 2.3 5.2 13 7.2 2.3 2.4 2.0 2.2 1.9 1.9 1.8 1.9 2.5 2.0 1.8 1.8 --- 101.4 3.38 13 1.8 201 .85 .95 1.7 1.9 1.8 2.0 2.6 2.6 1.8 1.8 2.0 8.9 13 7.7 3.3 19 11 4.3 8.3 4.3 3.7 2.9 2.8 e2.7 e2.4 e4.2 e7.9 e3.7 3.1 2.8 4.8 2.7 2.5 144.2 4.65 19 1.7 286 1.17 1.35 3.5 2.3 1.9 1.8 3.7 3.4 1.9 1.7 1.7 1.6 1.4 1.6 1.4 1.2 1.1 1.1 52 7.5 2.1 1.4 1.3 1.2 1.2 1.2 1.3 51 3.1 2.1 1.9 4.3 --- 162.9 5.43 52 1.1 323 1.37 1.53 2.3 1.8 1.5 1.5 1.5 1.7 1.8 2.0 1.5 1.4 1.3 1.4 1.4 1.4 1.6 1.5 2.2 151 4.5 2.1 1.7 1.6 1.5 1.5 1.4 1.4 1.7 1.9 2.1 1.7 40 241.9 7.80 151 1.3 480 1.97 2.27 13 2.1 1.5 1.7 1.6 4.4 5.3 4.5 2 . 2 2.0 1.6 1.5 1.5 1.5 1.5 1.4 1.4 3.7 8.0 8.5 1.8 1.6 3.5 9.0 1.9 1.5 1.6 1.6 1.5 1.4 1.4 95.7 3.09 13 1.4 190 .78 .90 1.4 1.5 1.6 1.7 1.6 12 7.1 14 2.4 30 10 3.1 2.6 2.5 3.0 3.8 3.0 3.3 2.9 105 14 11 4.6 3.7 3.5 2.8 2.7 2.8 2.8 2.8 --- 263.2 8.77 105 1.4 522 2.22 2.47 , BY WATER YEAR (WY) 12.3 33.5 1990 2.20 1984 FOR 1994 2866 7 259 1 1 2830 14 5680 1 26 13 3 1 32.6 63.9 1982 4.65 1994 WATER YEAR .0 .85 Feb 19 . 1 Jun 15 .3 Jun 10 Feb 19 . 00 Feb 19 . 94 Jun 16 .98 .92 .8 .5 20.7 50.6 1987 4.70 1985 15.1 31.3 1989 5.84 1986 WATER 18 28 7 887 1 9600 19 13700 4 64 35 8 2 16.0 32.7 1988 3.09 1994 YEARS 1980 .9 .2 .85 Sep .96 Apr . 0 Apr Jan .74 Jan .86 Apr .78 .88 .3 .6 16.6 56.3 1989 7.23 1987 - 1994 1988 1994 18 1989 10 1983 6 1983 5 1992 5 1992 17 1983 e Estimated 308 RIO FAJARDO BASIN 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 mi (0.2 km) upstream from Highway 977 bridge, 0.3 mi (0.5 km) downstream from Quebrada Pefton, 1.1 mi (1.8 km) northeast of Colonia Paraiso, and 3.3 mi (5.3 km) southwest of Fajardo. DRAINAGE AREA.--14.9 mi" (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 and crest-stage gage. Datum of gage is 137.60 ft (41.940 m) above mean sea level. Due to flood damage, gage datum has had changes as follows: Mar. 24, 1961 to May 5, 1969, 138.95 ft (42.352 m) ; May 6, 1969 to Mar. 16, 1972, 135.05 ft (41.163 m); Mar. 17, 1972 to Mar 25, 1975, 138.60 ft (42.245 m) . REMARKS.--Records fair except those for estimated daily discharges, which are poor. Low flow affected by diversions for water supply about 400 m upstream from gaging station (estimated mean daily discharges is 9.0 ft'/s (0.255 mVs). Gage-height and precipitation satellite telemetry at station. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN AUG SEP 1 10 5.7 2 6.8 5.1 3 10 4.6 4 7.6 4.8 5 5.3 4.4 6 5.8 4.1 7 67 4.3 8 8.2 5.5 9 16 6.4 10 27 4.7 11 11 7.0 12 13 4.1 13 6.8 7.5 14 5.0 12 15 4.4 77 16 16 255 17 85 44 18 17 89 19 25 56 20 17 19 21 19 11 22 133 9.4 23 212 8.4 24 63 7.7 25 15 el4 26 16 e34 27 47 e!9 28 19 e!3 29 9.1 e!7 30 7.0 e26 31 6.1 --- TOTAL 910.1 779.7 MEAN 29.4 26.0 MAX 212 255 MIN 4.4 4.1 AC-FT 1810 1550 CFSM 1.97 1.74 IN. 2.27 1.95 e!6 e!4 e!2 e!5 e!8 el5 ell e9.8 e8.7 6.6 5.7 4.9 4.6 4.5 4.4 4.2 3.9 4.1 43 168 102 30 26 27 22 20 56 135 20 24 15 850.4 27.4 168 3.9 1690 1.84 2.12 STATISTICS OF MONTHLY MEAN DATA MEAN 94.9 103 MAX 260 295 (WY) 1971 1975 MIN 19.1 26.0 (WY) 1969 1994 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN- DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE INSTANTANEOUS LOW FLOW ANNUAL RUNOFF (AC-FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 79.7 237 1976 14.9 1990 FOR 50 72 27 24 32 18 13 12 11 10 21 16 18 21 11 11 20 12 9.3 12 15 11 8.3 7.6 8.8 7.6 7.2 38 77 18 10 628.8 20.3 77 7.2 1250 1.36 1.57 FOR WATER 44.6 101 1969 15.4 1977 15 20 11 32 15 9.5 9.3 9.2 7.6 6.9 6.4 6.5 6.4 14 8.8 11 7.3 27 e310 el30 e33 e68 e38 e28 e25 e27 e22 e!5 ___ ___ --- 918.9 32.8 310 6.4 1820 2.20 2.29 YEARS 1961 37.0 80.4 1982 10.8 1983 e!7 e52 e21 e!4 e!3 e!2 e!2 ell elO e9.5 e9.1 e36 e!3 elO e9.2 e8.9 e8.9 e8.9 8.5 7.9 7.7 8.3 7.2 7.7 7.2 25 7.2 6.5 9.9 12 7.3 397.9 12.8 52 6.5 789 .86 .99 - 1994 35.0 109 1987 9.70 1977 1993 CALENDAR YEAR 15136. 41. 743 3. 4. 30020 2. 37. 86 19 7. 4 5 Sep 16 9 Dec 17 4 Dec 12 78 79 7 5.9 5.8 8.6 7.2 5.7 5.1 6.7 9.4 5.7 4.8 91 12 7.2 8.5 31 17 14 10 7.5 6.1 5.5 4.8 4.5 4.3 4.0 3.5 4.4 5.3 3.8 3.2 --- 312.5 10.4 91 3.2 620 .70 .78 , BY WATER 45.1 129 1963 4.02 1984 3.0 3.3 2.9 3.5 16 10 5.1 7.8 16 98 23 12 8.0 185 41 22 19 11 9.8 8.3 7.8 7.2 6.7 6.5 7.2 8.1 7.6 7.7 8.9 7.9 7.4 587.7 19.0 185 2.9 1170 1.27 1.47 YEAR (WY) 93.7 399 1979 17.7 1973 10 7.8 6.5 7.0 12 13 7.9 6.2 7.5 7.0 6.7 8.5 8.5 6.0 4.7 4.3 65 17 7.8 6.0 4.8 3.9 3.8 3.7 4.2 26 6.8 5.3 27 29 ___ 333.9 11.1 65 3.7 662 .75 .83 59.7 166 1962 10.0 1985 FOR 1994 WATER YEAR 6942.3 19.0 310 2.7 3.2 6410 9.67 13770 1.28 17.33 37 8.7 4.1 Feb 19 Aug 16 Jul 21 Feb 19 Feb 19 8.6 5.7 4.7 5.5 5.7 6.7 9.6 5.8 4.9 3.6 3.5 3.7 4.1 3.0 2.9 2.9 2.8 105 8.6 5.0 3.7 3.4 3.0 3.1 3.1 3.0 3.2 3.9 13 5.7 106 353.4 11.4 106 2.8 701 .77 .88 50.2 132 1969 11.4 1994 WATER 65 140 19 8800 -1 1 23500 20 47710 4 60 125 33 11 14 7.1 5.2 4.0 3.3 5.2 6.7 4.2 3.0 4.5 3.8 3.0 3.2 3.5 5.4 2.7 4.5 18 55 11 3.8 7.5 31 25 22 8.8 7.7 8.7 7.1 6.3 5.4 300.6 9.70 55 2.7 596 .65 .75 56.5 159 1979 9.70 1994 YEARS 1961 .9 .0 Sep .0 May .5 Apr Sep . 0 0 Sep .86 May .42 .05 4.6 7.4 21 11 6.3 66 78 32 11 17 13 7.0 5.1 5.2 4.6 8.3 6.7 5.4 8.6 141 18 18 12 12 9.2 9.2 8.0 7.7 7.9 7.2 --- 568.4 18.9 141 4.6 1130 1.27 1.42 84.9 421 1989 18.9 1994 - 1994 1979 1994 18 1989 6 1984 18 1984 18 1989 18 1989 3 1984 e Estimated 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 1993 TO SEPTEMBER 1994 WATER-QUALITY DATA 309 DATE OCT 1993 29... DEC 21.. . FBB 1994 25.. . MAY 05.. . JUN 16.. . AUG 16. .. DATE OCT 1993 29. .. DEC 21... FBB 1994 25. . . MAY 05. . . JUN 16. . . AUG 16. . . DATE OCT 1993 29. . . DEC 21. . . FBB 1994 25. .. MAY 05. .. JUN 16. .. AUG 16. .. DIS- PH OXYGEN, OXYGEN COLI- CHARGB, SPB- WATER DIS- DEMAND, FORM, STREP- HARD- INST. CIFIC WHOLE SOLVED CHBM- FECAL, TOCOCCI NESS CUBIC CON- FIELD TEMPER- TUR- OXYGEN, (PER- ICAL 0.45 FECAL, TOTAL FEET DUCT- (STAND- ATURB BID- DIS- CENT (HIGH UM-MF (COLS. (MG/L TIME PER ANCB ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER AS SECOND (US/CM) UNITS) (DBG C) (NTU) (MG/L) ATI ON) (MG/L) 100 ML) 100 ML) CACO3) 1200 1312 0910 0820 0850 0830 HARD- NESS NONCARB WH WAT TOT FLD MG/L AS CACO3 7 -- -- 5 -- 4 SILICA, DIS- SOLVED (MG/L AS SI02) 26 -- -- 28 -- 27 4.7 60 25 4.8 4.6 2.9 CALCIUM DIS- SOLVED (MG/L AS CA) 7.3 -- -- 8.3 -- 8.5 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 84 -- -- 101 -- 96 127 195 112 133 134 127 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 3.9 -- -_ 4.1 -- 3.9 SOLIDS, DIS- SOLVED (TONS PER DAY) 1.06 -- -- 1.30 -- 0.74 7.2 7.5 7.1 7.6 7.0 6.9 SODIUM, DIS- SOLVED (MG/L AS NA) 11 -- -- 13 -- 12 RESIDUE TOTAL AT 105 DBG. C, SUS- PENDED (MG/L) 3 1 <1 <1 4 5 27.0 25.0 24.0 27.5 26.5 28.0 SODIUM AD- SORP- TION RATIO 0.8 -- -- 0.9 -- 0.9 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) <0.20 0.20 <0.20 <0.20 <0.20 <0.20 3.2 6.0 0.50 0.30 0.50 0.20 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 1.3 -- -- 1.2 -- 0.90 PHOS- PHORUS TOTAL (MG/L AS P) •cO.010 •cO.010 •cO.010 0.010 0.020 0.010 5.7 8.2 4.4 6.2 4.5 3.0 ALKA- LINITY WAT WH TOT FBT FIELD MG/L AS CAC03 36 51 36 48 34 41 ARSENIC TOTAL (UG/L AS AS) <1 -- -- <1 -- -- 71 11 114 <10 51 <10 90 <10 55 14 38 17 SULFATB SULFIDB DIS- TOTAL SOLVED (MG/L (MG/L AS S) AS S04) 0.8 3.2 __ __ <0.5 4.0 __ 4.6 BARIUM, BORON, TOTAL TOTAL RBCOV- RECOV- ERABLE BRABLE (UG/L (UG/L AS BA) AS B) 100 10 __ __ <100 20 __ __ 690 5300 30 K20 K50 150 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 9.8 -- -- 14 -- 14 CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- <1 -- -- 680 34 440 220 350 38 270 1800 37 FLUO- RIDB, DIS- SOLVED (MG/L AS F) 0.10 -- -- 0.10 -- 0.20 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) <1 -- -- <1 -- — K = non-ideal count 310 RIO PAJARDO BASIN 50071000 RIO PAJARDO NEAR PAJARDO, PR—Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE OCT 1993 29. . . DEC 21. .. PEB 1994 25. . . MAY 05. . . JUN 16. . . AUG 16. . . COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) <10 -- -- <10 -- -- IRON, TOTAL RECOV- ERABLE (UG/L AS PE) 330 -- -- 50 -- -- LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) <1 -- -_ 1 -- -- MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) 10 _- -- <10 -- -- MERCURY TOTAL RECOV- ERABLE (UG/L AS HG) <0.10 — — 0.20 __ -- SELE- NIUM, TOTAL (UG/L AS SB) <1 -- _- <1 -- -- SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) <1 -- -- <1 -- -- ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) <10 -- -- <10 -- -- CYANIDE TOTAL PHENOLS (MG/L TOTAL AS CN) (UG/L) <0.010 <1 __ __ <0.010 <1 __ __ MBTHY- LENE BLUB ACTIVE SUB- STANCE (MG/L) <0.02 -- -- 0.03 -- -- PESTICIDE ANALYSES DATE JUN 1994 16. . . DATE JUN 1994 16. .. DATE CHLOR- DI- DI- ENDO- PCB, ALDRIN, DANE, ODD, DDE, DOT, AZINON, ELDRIN SULPAN, 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) 0850 ENDRIN WATER UNPLTRD REC (UG/L) <0.010 PARA- THION, TOTAL (UG/L) <0.1 <0 BTHION, TOTAL (UG/L) <0.01 NAPH- THA- LENES, POLY- CHLOR. TOTAL (UG/L) .010 HEPTA - CHLOR, TOTAL (UG/L) <0.010 PER- THANE TOTAL (DG/L) <0.1 <0. HEPTA- CHLOR EPOXIDB TOTAL (DG/L) <0.010 TOX- APHENB, TOTAL (DG/L) ,010 <0. LINDANE TOTAL (UG/L) <0.010 TOTAL TRI- THION (UG/L) ,010 <0 MALA- THION, TOTAL (UG/L) <0.01 2,4-D, TOTAL (UG/L) .010 METH- OXY- CHLOR, TOTAL (UG/L) <0.01 2,4,5-T TOTAL (UG/L) <0.01 <0. METHYL PARA- THION, TOTAL (UG/L) <0.01 2, 4-DP TOTAL (UG/L) ,010 <0.010 MIREX, TOTAL (UG/L) <0.01 SILVEX, TOTAL (UG/L) JUN 1994 16.. . <0.01 <0. 10 <0.01 <0.01 <0.01 <0.01 <0.01 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 mi 2 (60.6 km 1 ). PERIOD OF RECORD.--Water years 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 3 1 1 DATE OCT 1993 29. .. DEC 20... FBB 1994 25. .. MAY 05. . . JUN 16. . . ADG 16. . . DATE OCT 1993 29. .. DEC 20. . . FBB 1994 25.. . MAY 05. . . JUN 16. . . ADG 16. . . DATE OCT 1993 29. . . DEC 20. .. FEB 1994 25. . . MAY 05. . . JUN 16. .. AUG 16. . . TIME 1330 1315 1055 1115 1015 1015 HARD- NESS TOTAL (MG/L AS CACO3) 33 -- -- 58 -- 49 SILICA, DIS- SOLVED (MG/L AS SI 02) 23 -- -- 24 -- 25 DIS- CHARGE, INST. CUBIC FEET PER SECOND 8.9 22 36 29 10 5.4 CALCIUM DIS- SOLVED (MG/L AS CA) 7.2 -- -- 14 -- 11 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 84 -- -- 131 -- 109 SPE- CIFIC CON- DUCT- ANCE (US/CM) 127 186 152 221 262 162 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 3.6 -- -- 5.6 -- 5.2 SOLIDS, DIS- SOLVED (TONS PER DAY) 2.01 -- -- 10.3 -- 1.57 PH WATER WHOLE FIELD (STAND- ARD UNITS) 7.2 7.1 7.0 7.8 6.8 7.4 SODIUM, DIS- SOLVED (MG/L AS NA) 10 -- -- 19 -- 15 RESIDUE TOTAL AT 105 DEG. C, SUS- PENDED (MG/L) 12 2 8 1 2 5 TEMPER- ATURE WATER (DEG C) 28.0 26.0 26.0 27.0 28.0 30.0 SODIUM AD- SORP- TION RATIO 0.8 -- -- 1 -- 0.9 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.30 <0.20 <0.20 <0.20 <0.20 <0.20 TUR- BID- ITY (NTU) 6.1 3.1 1.7 1.4 0.20 0.50 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 1.3 -- -- 1.1 -- 1.0 PHOS- PHORUS TOTAL (MG/L AS P) 0.020 <0.010 <0.010 0.020 0.030 0.020 OXYGEN, DIS- SOLVED (MG/L) 5.7 7.4 6.7 5.2 4.0 7.8 ALKA- LINITY WAT WH TOT FET FIELD MG/L AS CACO3 38 44 43 57 47 46 ARSENIC TOTAL (UG/L AS AS) <1 -- __ <1 -- — OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 71 89 81 65 50 101 SULFIDE TOTAL (MG/L AS S) 0.6 -- -- <0.5 -- — - BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 -- -- <100 -- -- OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 16 12 <10 <10 <10 20 SULFATE DIS- SOLVED (MG/L AS SO4) 4.0 -- -- 6.3 -- 5.6 BORON, TOTAL RECOV- ERABLE (UG/L AS B) 30 -- _- 30 -- -- COLI- FORM, FECAL, 0.45 UM-MF (COLS./ 100 ML) 5300 490 330 460 250 200 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 12 -- -- 27 -- 18 CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- <1 -- -- STREP- TOCOCCI FECAL, (COLS. PER 100 ML) 440 K10 2400 K54 K110 250 FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.10 -- -- 0.10 -- 0.20 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) 1 -- -- <1 -- -- K = non-ideal count 312 RIO PAJARDO BASIN 50072500 RIO PAJARDO BELOW PAJARDO, PR—Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 COPPER, IRON, TOTAL TOTAL RECOV- RECOV- ERABLE BRABLE DATE (UG/L (UG/L LEAD, TOTAL RECOV- ERABLE (UG/L MANGA- NESE, MERCURY TOTAL TOTAL RECOV- ERABLE RECOV- ERABLE (UQ/L (UQ/L SELE- NIUM, TOTAL (UQ/L SILVER, TOTAL RECOV- ERABLE (UG/L ZINC, TOTAL RBCOV- CYANIDE BRABLE TOTAL (UQ/L (MQ/L MBTHY- LBNB BLUE ACTIVE PHENOLS SUB- TOTAL AS CO) AS FE) AS PB) AS MN) AS HQ) AS SB) AS AG) AS ZN) AS CN) (UQ/L) STANCE (MG/L) OCT 1993 29. . . DEC 20. .. FBB 1994 25. .. MAY 05. .. JUN 16. . . AUQ 16. .. 690 <1 60 <0.10 250 2 30 0.20 <0.010 2 0.05 10 <0.010 0.03 RIO BLANCO BASIN 50074950 QUBBRADA ODABA NEAR NAGUABO, PR 313 LOCATION.--Lat 18°17'02", long 65°47'20", Hydrologic Unit 21010005, on right bank, off Highway 191 at El Yunque Caribbean National Forest, 4.8 mi (7.7 km) southeast of Campamento Eliza Colberg, 1.3 mi (2.1 km) southeast of Ht. Britton, 2.0 mi (3.2 km) northwest of Pico del Bste and 7.3 mi (11.7 km) southeast of Rio Grande Plaza. DRAINAGE AREA.--0.05 mi 1 (0.13 km 1 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--June 1992 to current year. GAGE.--Water-stage recorder. Elevation of gage is 2,100 ft (640 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. Gage-height and precipitation satellite telemetry at station. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY OCT NOV DEC JAN FBB MAR APR JUN JUL AUG SEP 1 .41 .21 2 .35 .15 3 .49 .12 4 .42 .12 5 .34 .16 6 .36 .15 7 1.2 .17 8 .50 .39 9 .57 .49 10 .47 .26 11 .45 .21 12 .41 .16 13 .23 .24 14 .16 .95 15 .16 1.3 16 .51 1.0 17 .77 .48 18 .36 .73 19 .43 .36 20 .42 .30 21 .29 .22 22 .48 .25 23 .53 .26 24 .30 .24 25 .25 .26 26 .23 .54 27 .49 .25 28 .35 .24 29 .25 .22 30 .22 .36 31 .19 --- TOTAL 12.59 10.79 MEAN .41 .36 MAX 1.2 1.3 MIN .16 .12 AC-FT 25 21 CFSM 3.38 3.00 IN. 3.90 3.34 STATISTICS OF MONTHLY MEAN MEAN .33 .56 MAX .41 .76 (WY) 1994 1993 MIN .25 .36 (WY) 1993 1994 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN-DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE ANNUAL RUNOFF (AC-FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS .41 .22 .20 .23 .30 .22 .18 .15 .17 .17 .13 .14 .14 .14 .13 .12 .12 .12 .69 .69 .19 .16 .15 .16 .13 .14 .22 .46 .16 .17 .21 6.82 .22 .69 .12 14 1.83 2.11 DATA .41 .61 1993 .22 1994 FOR .36 .28 .19 .17 .18 .16 .16 e.15 e.16 e.24 .47 .26 .24 .26 .22 .26 .32 .24 .30 .34 .32 .25 .18 .19 .17 .14 .17 .75 .87 .43 .31 8.74 .28 .87 .14 17 2.35 2.71 .31 .53 .35 .51 .34 .27 .32 .28 .27 .24 .23 .21 .23 .40 .25 .39 .24 .37 6.1 2.3 .44 .37 .41 .32 .36 .30 .29 .25 ___ ___ --- 16.88 .60 6.1 .21 33 5.02 5.23 FOR WATER YEARS 1992 .42 .55 1993 .28 1994 .46 .60 1994 .32 1993 .30 .64 .33 .22 .22 .19 .19 .19 .19 .20 .35 .65 .25 .26 .23 .20 .20 .20 .19 .18 .16 .15 .18 .17 .15 .20 .14 .13 .20 .17 .12 7.15 .23 .65 .12 14 1.92 2.22 - 1994 .26 .29 1993 .23 1994 1993 CALENDAR YEAR 137.88 .38 4.0 .12 .13 273 3.15 42.74 .62 .26 .16 Jul 11 Aug 29 Dec 12 .12 .11 .10 .09 .10 .38 .68 .25 .15 .31 1.4 .66 .29 .34 .42 .57 .60 .39 .30 .23 .22 .24 .25 .25 .22 .23 .27 .27 .20 .19 --- 9.83 .33 1.4 .09 19 2.73 3.05 .18 .16 .14 .20 .49 .28 .25 .30 .90 .98 .42 .28 .25 .97 .46 .38 .33 .38 .28 .27 .22 .22 .20 .20 .22 .19 .19 .18 .20 .18 .23 10.13 .33 .98 .14 20 2.72 3.14 .19 .17 .22 .19 .38 .81 .23 .19 .18 .18 .45 .26 .24 .22 .47 .27 el. 3 e.64 e.30 e.23 e.19 e.18 e.17 e.18 .21 .47 .16 .25 .35 .65 --- 9.93 .33 1.3 .16 20 2.76 3.08 .16 .16 .15 .17 .14 .24 .20 .21 .14 .13 .14 .13 .13 .13 .13 .18 .17 1.1 .20 .13 .13 .11 .11 .11 .11 .17 .13 .35 .37 .15 .95 6.83 .22 1.1 .11 14 1.84 2.12 .27 .20 .16 .16 .14 .16 .13 .14 .14 .16 .13 .13 .14 .18 .17 .15 .16 1.4 .45 .23 .19 .22 .51 .57 .36 .13 .20 .38 .22 .13 .12 7.83 .25 1.4 .12 16 2.10 2.43 .12 .35 .17 .13 .13 .70 .58 .36 .26 .66 .30 .22 .24 .26 .26 .32 .17 .17 .60 1.7 .37 .27 .38 .27 .23 .20 .20 .20 .20 .21 --- 10.23 .34 1.7 .12 20 2.84 3.17 , BY WATER YEAR (WY) .33 .33 1994 .32 1993 FOR 1994 117. . 6. 51 9. 234 2. 36. .47 .61 1993 .33 1994 WATER YEAR 75 32 1 Feb 19 09 Apr 4 12 Mar 30 Feb 19 86 Feb 19 69 50 55 23 14 .33 .33 1994 .32 1993 .66 1.18 1992 .22 1994 WATER 6 64 10 273 3 42 .33 .56 1992 .19 1993 YEARS 1992 .38 .43 .32 .1 Jul . 09 Apr . 12 Mar May .11 May .14 .67 .78 .27 .16 .35 .38 1992 .34 1993 - 1994 1993 1994 16 1992 4 1994 30 1994 1 1993 1 1993 e Estimated 314 RIO BLANCO BASIN 50075000 RIO ICACOS NEAR NAGUABO, PR LOCATION.--Lat 18°16'38", long 65°47'09", Hydrologic Unit 21010005, in Caribbean National Forest, off Highway 191, at El Yunque, 1.6 mi (2.6 km) upstream from confluence with Rio Cubuy, 2.8 mi (4.5 km) north of Florida, and 5.3 mi (8.5 km) northwest of Naguabo Plaza. DRAINAGE AREA.--1.26 mi J (3.26 km a ). 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 except those for estimated daily discharges, which are poor. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES NOV DEC JAN APR MAY JUN SEP 1 5.1 4.5 2 5.8 4.1 3 9.0 4.0 4 7.3 3.9 5 4.9 3.9 6 5.5 3.8 7 25 4.2 8 6.2 8.7 9 7.3 10 10 5.7 5.3 11 5.2 4.5 12 5.5 3.8 13 5.1 5.4 14 4.5 25 15 3.8 42 16 11 35 17 18 20 18 6.6 36 19 9.8 13 20 8.8 12 21 6.8 7.2 22 20 7.9 23 13 8.1 24 5.5 6.5 25 4.8 7.6 26 5.3 21 27 20 8.0 28 11 6.4 29 5.3 6.4 30 4.6 15 31 4.2 TOTAL 260.6 343.2 MEAN 8.41 11.4 MAX 25 42 MIN 3.8 3.8 AC-FT 517 681 CFSM 6.67 9.08 IN. 7.69 10.13 STATISTICS OF MONTHLY MEAN MEAN 15.4 18.4 MAX 32.1 46.8 (WY) 1986 1951 MIN 4.78 8.00 (WY) 1993 1948 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN -DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE ANNUAL RUNOFF (AC-FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 6.8 5.8 5.4 8.2 10 8.4 5.5 5.2 5.5 5.2 4.8 5.1 4.7 4.6 4.2 3.4 3.4 3.5 19 25 7.5 4.5 4.0 4.3 3.6 4.6 12 21 4.8 5.5 6.9 222.4 7.17 25 3.4 441 5.69 6.57 DATA 15.3 31.3 1988 4.99 1990 FOR 14 11 5.5 5.9 5.4 4.2 5.5 4.3 4.5 7.8 16 6.7 7.2 5.3 4.4 4.8 6.5 3.9 5.2 6.5 6.1 4.0 3.8 3.6 3.6 3.4 3.6 17 17 5.5 3.8 206.0 6.65 17 3.4 409 5.27 6.08 4.7 7.6 3.9 8.4 5.1 3.7 4.4 3.7 3.6 3.4 3.3 3.2 3.2 6.2 3.6 6.4 3.1 5.6 119 81 10 8.9 8.3 6.0 5.8 4.1 3.7 3.0 -__ ___ --- 332.9 11.9 119 3.0 660 9.44 9.83 FOR WATER YEARS 1945 12.7 26.9 1952 6.65 1994 13.4 44.0 1950 4.86 1983 4.1 17 5.4 3.7 3.5 3.5 3.4 3.4 3.2 3.3 4.7 14 4.6 4.9 e6.8 e7.7 e7.1 e6.7 e6.0 e5.8 e5.2 e4.6 e4.1 e4.6 e4.6 e5.1 e4.4 e5.7 e6.1 e6.2 e5.4 174 .8 5.64 17 3.2 347 4.48 5.16 - 1994 10.5 26.1 1949 3.90 1951 1993 CALENDAR YEAR 3895.1 10.7 68 3.1 4 .1 7730 8.47 115.00 20 7.2 4.5 Apr 30 Jul 5 Oct 31 e5.6 e5.4 e5.5 e4.8 e5.2 e7.3 e5.1 e7.8 e5.2 e7.0 e30 e!5 e6.1 e8.4 e7.2 e!2 e!3 e7.4 e6.2 e5.3 e5.2 e4.5 e5.5 e5.4 e4.4 e5.0 e5.8 e4.8 e4.5 e4.1 --- 218.7 7.29 30 . 4.1 434 5.79 6.46 , BY WATER 12.6 34.4 1950 4.77 1984 e3.9 e4.0 e4.5 e4.5 ell e6.0 e5.4 e6.4 e!9 e21 e9.0 e6.0 e5.4 e21 elO e7.2 5.5 6.9 5.6 4.8 4 .1 4.3 3.9 3.9 4.2 3.9 3.8 3.8 4.1 3.8 5.2 212.1 6.84 21 3.8 421 5.43 6.26 YEAR (WY) 17.1 26.3 1948 6.84 1994 4.2 3.6 4.6 3.8 9.7 21 4.2 3.8 3.7 3.5 12 4.9 4.8 3.6 7.0 4.0 33 9.3 5.9 4.9 4.6 4.5 4.4 3.7 4.2 19 4.3 5.8 14 29 --- 245.0 8.17 33 3.5 486 6.48 7.23 12.1 20.5 1987 5.19 1985 FOR 1994 WATER YEAR 2921.7 8.00 119 2.8 3.4 872 5. 89 5800 6.35 86.26 15 5.2 3.6 Feb 19 Sep 5 Mar 4 Feb 19 Feb 19 5.4 4.5 4.9 4 .9 4 .3 8.8 6.3 7.7 5.1 4.9 4 .9 5.0 4.6 4.4 4.4 5.1 4.5 40 6.4 4.3 4.0 4.0 3.7 3.8 3.7 4.3 3 .9 11 10 3.8 31 223.6 7.21 40 3.7 444 5.72 6.60 13.6 38.8 1952 7.21 1994 WATER 14, 21, 8, 470 1, 2. 2860 8. 10340 11, 153. 29 8. 4. 6.0 4.5 3.9 3.8 3.9 4.8 4.3 4.0 e3.9 3.7 3.2 3.2 3.4 3.8 3.9 3.9 4.0 38 14 4.9 3.0 4.0 18 13 10 4.7 6.1 9.4 4.7 3.1 2.9 204.0 6.58 38 2.9 405 5.22 6.02 14.1 24.5 1945 5.91 1993 YEARS 1945 - .3 .0 .00 Sep 18 .5 Mar 22 . 0 Apr 7 Apr 21 .96 Apr 21 ,3 .87 ,1 ,5 3.0 6.8 3.3 3.0 2.8 20 23 12 8.7 22 9.0 5.9 5.5 5.8 7.9 12 5.6 5.1 18 51 6.9 6.2 9.1 5.3 4.2 3.5 3.2 3.3 3.1 3.2 --- 278.4 9.28 51 2.8 552 7.37 8.22 16.6 37.6 1989 7.03 1986 1994 1952 1994 1989 1946 1946 1983 1983 e Estimated .——S\ •, Ft fa AnSc-f* F) M|, 00*1" "'' 0123456 KILOMETERS 01234 MILES ( EXPLANATION AQ920 SURFACE-WATER STATION AND NUMBER Y0835 QUALITY-OF-WATER STATION AND NUMBER • se WELL AND WELL NUMBER SEA Figure 22.--Southeastern river basins the Rio Humacao to Rio Seco basins. CO ••* Ol 316 RIO HUMACAO BASIN 50081000 RIO HUMACAO AT LAS PIEDRAS, PR LOCATION.—Lat 18°10'27 M , long 65°52'11", Hydrologlc unit 21010005, on left bank at downstream side of bridge on Highway 921, 0.6 mi (1.0 km) southeast of junction with Highway 30, 0.8 mi (1.3 km) downstream from Quebrada Blanca and 0.8 mi (1.3 km) south of Las Piedras. DRAINAGE AREA.--6.65 mi* (17.22 km1 ). 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 and crest-stage gage. Elevation of gage is 260 ft (79 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 ft3/s (28.3 mVs) and estimated daily discharges, which are poor. Gage-height and precipitation satellite telemetry at station. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES NOV DEC JAN FEE APR MAY JUN JUL 1 26 11 2 15 11 3 15 11 4 14 11 5 14 11 6 38 10 7 19 11 8 15 13 9 13 12 10 13 16 11 12 12 12 17 11 13 20 11 14 13 16 15 12 15 16 12 57 17 13 19 18 12 e34 19 11 e53 20 11 101 21 11 36 22 10 23 23 14 20 24 11 22 25 12 24 26 12 39 27 13 22 28 67 20 29 16 18 30 13 46 31 12 - — TOTAL 506 716 MEAN 16.3 23.9 MAX 67 101 MIN 10 10 AC-FT 1000 1420 CFSM 2.45 3.59 IN. 2.83 4.01 STATISTICS OF MONTHLY MEAN MEAN 31.1 40.7 MAX 74.9 126 (WY) 1975 1988 MIN 12 . 8 17 . 0 (WY) 1993 1990 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN- DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE ANNUAL RUNOFF (AC-FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 20 17 18 16 e!5 e!5 elS e!5 e!4 e!4 e!4 e!4 e!4 14 14 14 13 13 13 13 13 15 13 13 13 12 14 18 14 13 13 446 14.4 20 12 885 2.16 2.49 DATA 32.6 112 1988 11.5 1992 FOR 15 16 16 13 16 13 13 12 14 21 18 15 18 27 13 12 12 12 12 11 11 11 11 12 11 12 11 12 14 15 14 433 14.0 27 11 859 2.10 2.42 13 14 14 15 14 14 14 13 12 12 12 12 12 13 13 12 11 12 35 e!98 21 16 32 19 17 16 16 16 ___ --- 618 22.1 198 11 1230 3.32 3.46 FOR WATER YEARS 1974 19.3 34.1 1992 10.8 1990 15.5 22.1 1994 11.0 1977 15 16 17 15 14 14 14 15 13 26 13 35 13 12 12 11 11 10 11 10 10 9.7 9.4 9.4 9.4 10 9.4 9.6 11 12 9.7 406.6 13.1 35 9.4 806 1.97 2.27 - 1994 11.6 16.4 1989 9.10 1993 1993 CALENDAR YEAR 6671.0 18.3 335 5.2 6.1 13230 2.75 37.32 23 13 8.0 Jul 11 Apr 12 Apr 6 9.4 9.1 9.0 9.0 8.7 13 11 9.3 8.7 8.7 9.8 9.6 8.7 8.7 9.0 8.4 10 10 9.8 8.9 8.7 9.0 8.7 9.4 9.3 8.7 8.7 13 10 8.8 --- 283.1 9.44 13 8.4 562 1.42 1.58 8.6 8.0 8.0 8.6 8.1 9.1 8.4 8.3 40 51 17 17 29 49 15 12 11 11 10 9.7 9.6 9.0 9.0 8.7 e8.0 e8.8 e8.2 8.0 7.8 7.7 8.5 432.1 13.9 51 7.7 857 2.10 2.42 8.6 7.7 7.4 7.2 6.5 12 8.0 7.1 7.8 7.7 8.2 7.8 6.9 7.2 12 10 13 11 8.7 7.8 7.3 6.8 6.7 6.3 6.8 16 10 11 10 12 265.5 8.85 16 6.3 527 1.33 1.49 8.0 7.9 7.8 7.3 6.8 6.8 7.8 7.4 6.9 6.5 6.3 6.5 5.7 5.4 5.7 5.8 5.8 56 14 9.4 8.2 7.5 7.1 6.5 6.2 6.9 7.3 6.6 6.8 6.5 9.9 273.3 8.82 56 5.4 542 1.33 1.53 8.9 7.6 7.6 9.8 e!4 10 9.6 9.3 11 11 10 8.9 8.4 7.8 7.7 7.7 7.1 21 13 9.3 8.3 8.3 8.0 8.8 22 9.4 10 9.1 8.7 8.4 8.2 308.9 9.96 22 7.1 613 1.50 1.73 8.1 19 11 12 9.5 28 19 14 13 14 12 10 9.6 9.2 108 27 16 15 17 337 30 16 13 12 11 9.7 9.1 9.0 9.0 8.1 --- 835.3 27.8 337 8.1 1660 4.19 4.67 , BY WATER YEAR (WY) 9.26 13.1 1976 5.88 1977 FOR 1994 5523 15 337 5 5 1510 5 10960 2 30 20 12 7 15.2 42.2 1992 7.26 1990 WATER YEAR .8 .1 Sep 20 .4 Jul 14 .9 Jul 11 Sep 20 .50 Sep 20 .28 .90 .7 15.2 29.0 1992 5.91 1977 18.7 38.1 1993 7.95 1990 WATER 21 37 12 1670 2 2 20800 34 15680 3 44 32 13 6 18.4 32.7 1977 9.45 1974 YEARS 1974 - .6 .6 .1 Nov 27 .2 Jul 15 .8 Jul 19 Sep 6 . 4 0 Sep 6 .25 .21 .9 30.5 54.1 1975 10.0 1990 1994 1988 1990 1987 1974 1974 1960 1960 e Estimated 377 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 from Quebrada Mariana, and 0.4 mi (0.6 km) south of Humacao. DRAINAGE AREA.--17.3 mi 1 (44.8 km 1 ). PERIOD OF RECORD.--Water years 1958-66, 1969 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE OCT 1993 21... DEC 14... FEB 1994 16. .. APR 12. .. JUN 27... AOG 03. .. DATE OCT 1993 21. .. DEC 14. . . FBB 1994 16. . . APR 12. .. JUN 27. .. AOG 03. . . DATE OCT 1993 21. .. DEC 14. .. FBB 1994 16. . . APR 12. .. JUN 27. . . AUG 03. .. TIME 1345 1020 0955 1105 1005 1020 HARD- NESS TOTAL (MG/L AS CACO3 ) 89 -- -- 93 -- 120 SILICA, DIS- SOLVED (MG/L AS SI 02) 40 -- — 38 -- 41 DIS- CHARGE, INST. CUBIC FEET PBR SECOND 9.2 13 22 12 17 5.1 CALCIUM DIS- SOLVED (MG/L AS CA) 24 -- -- 28 -- 36 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 236 -- -- 254 -- 270 SPE- CIFIC CON- DUCT- ANCE (US /CM) 396 250 275 202 274 409 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 7.0 -- -- 7.3 -- 7.7 SOLIDS, DIS- SOLVED (TONS PBR DAY) 5.86 -- -- 8.23 -- 3.76 PH WATER WHOLE FIELD (STAND- ARD UNITS) 7.0 6.9 7.3 7.2 7.1 7.7 SODIUM, DIS- SOLVED (MG/L AS NA) 26 -- -- 22 -- 32 RESIDUE TOTAL AT 105 DBG. C, SUS- PENDED (MG/L) 37 14 19 7 20 1 TEMPER- ATURE WATER (DBG C) 31.0 23.5 25. 0 27.0 26.0 28.0 SODIUM AD- SORP- TION RATIO 1 -- -- 1 -- 1 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.30 0.50 0.70 0.60 0.30 0.30 TUR- BID- ITY (NTU) 17 3.2 4.6 -- 5.5 1.3 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 1.8 -- -- 1.1 -- 1.6 PHOS- PHORUS TOTAL (MG/L AS P) 0.110 0.380 0.230 0.190 0.130 0.080 OXYGEN, DIS- SOLVED (MG/L) 4.1 7.4 S.O 6.0 5.4 4.0 ALKA- LINITY WAT WH TOT FBT FIELD MG/L AS CAC03 160 100 87 100 77 150 ARSENIC TOTAL (UG/L AS AS) <1 -- -- <1 -- — OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 54 86 59 74 66 51 SULFIDB TOTAL (MG/L AS S) <0.5 -- -- <0.5 -- "" BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 -- -- <100 -- -- OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 16 21 27 -- <10 <10 SULFATB DIS- SOLVED (MG/L AS S04) 11 -- -- -- -- 12 BORON, TOTAL RECOV- ERABLE (UG/L AS B) 20 -- -- 40 -- -- COLI- FORM, FECAL, 0.45 UM-MF (COLS./ 100 ML) 44000 22000 29000 2000 2800 7000 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 30 -- -- -- -- 50 CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- <1 -- -- STREP- TOCOCCI FECAL, (COLS. PBR 100 ML) 79000 41000XS 180 K1500 340 2000 FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.20 -- -- -- -- 0.20 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) 1 -- -- <1 -- -- K = non-ideal count 318 RIO HOMACAO BASIN 50082000 RIO HUMACAO AT HIGHWAY 3 AT HDMACAO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE OCT 1993 21. .. DEC 14. . . FBB 1994 16. .. APR 12. .. JUN 27. .. AUG 03. .. COPPER, TOTAL RECOV- ERABLE (UG/L AS CO) <10 — — <10 -- -- IRON, TOTAL RECOV- ERABLE (UG/L AS PE) 1000 -- -- 1500 -- -- LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) 1 -- — <1 — -- MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) 260 -- -- 230 -- -- MERCURY TOTAL RECOV- ERABLE (UG/L AS HG) <0.10 -_ _- <0.10 — — SELE- NIUM, TOTAL (UG/L AS SB) <1 -_ -- <1 -- -- SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) <1 — — <1 -- -- ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) 10 -- -- <10 -- -- CYANIDE TOTAL PHENOLS (MG/L TOTAL AS CN) (UG/L) <0.010 1 __ __ <0.010 4 __ __ METHY- LENE BLUB ACTIVE SUB- STANCE (MG/L) 0.02 -- -- 0.03 -- -- LOCATION.--Lat 18°03'33' plaza. RIO GUAYANES BASIN 50083500 RIO GUAYANES AT YABUCOA, PR WATER-QUALITY RECORDS long 65°54'03", at bridge on Highway 182, 1.4 mi (2.2 km) west-northwest of Yabucoa 319 DRAINAGE AREA.--17.2 mi 1 (44.6 km 1 ). PERIOD OP RECORD.--Water years 1958-62, 1968-70, 1980 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE OCT 1993 20. . . DEC 15. .. PEB 1994 15. . . APR 06. .. JUN 15. .. AUG 03. . . DATE OCT 1993 20. . . DEC 15. . . PEB 1994 15. .. APR 06. . . JUN 15. .. AUG 03. . . DATE OCT 1993 20. .. DEC 15. .. PEB 1994 15. .. APR 06. . . JUN 15. . . AUG 03. .. TIME 1315 1330 1020 1030 0945 0840 HARD- NESS TOTAL (MG/L AS CACO3 ) 52 — -- -- -- 51 SILICA, DIS- SOLVED (MG/L AS SI02) 39 -- -- -- -- 37 DIS- CHARGE, INST. CUBIC FEET PER SECOND 30 28 33 20 17 18 CALCIUM DIS- SOLVED (MG/L AS CA) 13 -- -- -- -- 13 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 126 -- -- -- -- 169 SPE- CIFIC CON- DUCT- ANCE (US/CM) 163 190 144 180 175 158 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 4.7 -- -- -- -- 4.6 SOLIDS, DIS- SOLVED (TONS PER DAY) 10.2 -- -- -- -- 8.02 PH WATER WHOLE PIELD (STAND- ARD UNITS) 7.4 7.6 7.1 7.2 7.1 7.1 SODIUM, DIS- SOLVED (MG/L AS NA) 15 -- -- -- -- 15 RESIDUE TOTAL AT 105 DEG. C, SUS- PENDED (MG/L) 10 8 30 12 7 6 TEMPER- ATURE WATER (DBG C) 27.0 27.5 23.5 25.0 25.0 27.0 SODIUM AD- SORP- TION RATIO 0.9 -- -- -- -- 0.9 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.20 0.60 0.30 <0.20 0.20 0.20 TUR- BID- ITY (NTU) 3.7 9.8 22 __ -- 7.0 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 1.3 -- -- -- -- 1.8 PHOS- PHORUS TOTAL (MG/L AS P) 0.040 0.110 0.140 0.030 0.060 0.070 OXYGEN, DIS- SOLVED (MG/L) 4.7 5.8 2.6 3.6 3.2 6.0 ALKA- LINITY WAT WH TOT PET FIELD MG/L AS CAC03 62 61 56 70 67 130 ARSENIC TOTAL (UG/L AS AS) <1 -- -- <1 -- -- OXYGEN, OXYGEN DIS- DEMAND, SOLVED CHEM- (PER- ICAL CENT (HIGH SATUR- LEVEL) ATION) (MG/L) 62 <10 73 22 30 <10 43 38 74 <10 SULPATE SULPIDE DIS- TOTAL SOLVED (MG/L (MG/L AS S) AS S04) <0.5 3.6 __ __ <0.5 __ 5.2 BARIUM, BORON, TOTAL TOTAL RECOV- RECOV- ERABLE ERABLE (UG/L (UG/L AS BA) AS B) <100 20 __ __ <100 30 __ __ COLI- PORM, PECAL, 0.45 UM-MF (COLS./ 100 ML) 3800 4100 1300 330 K800 860 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 12 -- -- -- -- 14 CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- <1 -- -- STREP- TOCOCCI PECAL, (COLS. PER 100 ML) 300 390 1400 450 K2100 590 PLUO- RIDE, DIS- SOLVED (MG/L AS P) 0.20 -- -- -- -- 0.20 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) <1 -- -- <1 -- -- K = non-ideal count 320 RIO G0AYANBS BASIN 50083500 RIO QOAYANES AT YABUCOA, PR--Continued WATBR-QOALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE OCT 1993 20. .. DEC 15... FBB 1994 15. .. APR 06. .. JUN 15. .. AUG 03... COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) < 10 — — <10 -- -- IRON, TOTAL RECOV- ERABLE (UG/L AS FE) 1100 -- -- 960 -- -- LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) 1 -- -- <1 -- -- MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) 60 -- -- 140 -- -- MERCURY TOTAL RECOV- ERABLE (UG/L AS HG) <0.10 -- -- <0.10 -- -- SELE- NIUM, TOTAL (UG/L AS SB) <1 -- -- <1 -- -- SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) <1 -- -- <1 -- — ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) 10 -- -- <10 -- -- CYANIDE TOTAL PHENOLS (MG/L TOTAL AS CN) (UG/L) <0.010 <1 __ __ <0.010 4 __ __ MBTHY- LENB BLUB ACTIVE SUB- STANCE (MG/L) 0.02 -- -- <0.02 -- -- PESTICIDE ANALYSES DATE JUN 1994 15.. . JUN 1994 15. .. CHLOR- DI- DI- ENDO- PCB, ALDRIN, DANE, DDD, DDE, DDT, AZINON, ELDRIN SULFAN, TIME TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) 0945 ENDRIN WATER UNFLTRD REC (UG/L) <0.010 PARA- THION, TOTAL (UG/L) <0.1 <0. BTHION, TOTAL (UG/L) <0.01 NAPH- THA- LENES, POLY- CHLOR. TOTAL (UG/L) 010 HEPTA- CHLOR, TOTAL (UG/L) <0.010 PER- THANE TOTAL (UG/L) <0.1 <0. HEPTA- CHLOR BPOXIDB TOTAL (UG/L) <0.010 TOX- APHENE, TOTAL (UG/L) ,010 <0, LINDANE TOTAL (UG/L) <0.010 TOTAL TRI- THION (UG/L) ,010 <0 MALA- THION, TOTAL (UG/L) <0.01 2,4-D, TOTAL (UG/L) .010 METH- OXY- CHLOR, TOTAL (UG/L) <0.01 2,4,5-T TOTAL (UG/L) <0.01 <0 METHYL PARA- THION, TOTAL (UG/L) <0.01 2, 4-DP TOTAL (UG/L) ,010 <0.010 MIRBX, TOTAL (UG/L) <0.01 SILVEX, TOTAL (UG/L) JUN 1994 15... <0.01 <0.10 <0.01 <0.01 <0.01 <0.01 <0.01 321 RIO GUAYANES BASIN 50086500 RIO GUAYANES ABOVE MOUTH AT PLAYA DB 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 mi' (88.1 km 1 ). PERIOD OF RECORD.—Water years 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE OCT 1993 21. .. DEC 15... FEB 1994 16... APR 12. .. JON 27. .. AOG 04. .. DATE OCT 1993 21. . . DEC 15. .. FBB 1994 16. .. APR 12. .. JUN 27. . . AOG 04. . . DATE OCT 1993 21. .. DEC 15... FBB 1994 16. . . APR 12. .. JUN 27. .. AUG 04. .. TIME 1100 1100 0830 0905 0840 1045 HARD- NESS TOTAL (MG/L AS CAC03 ) 56 -- -- -- -- 52 SILICA, DIS- SOLVED (MG/L AS SI02) 37 — -- 32 -- 38 DIS- CHARGE, INST. CUBIC FEET PER SECOND 63 74 45 35 71 18 CALCIUM DIS- SOLVED (MG/L AS CA) 14 -- -- -- -- 13 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 148 -- -- 127 -- 131 SPE- CIFIC CON- DUCT- ANCE (US/CM) 211 330 199 245 190 179 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 5.2 -- — -- -- 4.7 SOLIDS, DIS- SOLVED (TONS PER DAY) 25.1 -- -- 12.4 -- 6.48 PH WATER WHOLE FIELD (STAND- ARD UNITS) 7.3 7.5 7.2 7.1 6.7 7.3 SODIUM, DIS- SOLVED (MG/L AS NA) 20 -- -- -- -- 17 RESIDUE TOTAL AT 105 DBG. C, SUS- PENDED (MG/L) 37 13 14 28 35 42 TEMPER- ATURE WATER (DBG C) 27.0 25.5 24.0 25.0 25.0 29.0 SODIUM AD- SORP- TION RATIO 1 — -- — -- 1 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.30 0.30 0.30 0.20 0.50 0.20 TUR- BID- ITY (NTU) 16 5.7 6.9 -- 38 28 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 2.4 -- -- -- -- 1.9 PHOS- PHORUS TOTAL (MG/L AS P) 0.060 0.090 0.070 0.070 0.140 0.080 OXYGEN, DIS- SOLVED (MG/L) 4.5 5.8 2.6 4.4 3.0 5.2 ALKA- LINITY WAT WH TOT PET FIELD MG/L AS CACO3 77 87 69 60 52 57 ARSENIC TOTAL (UG/L AS AS) <1 -- -- <1 -- -- OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 56 70 30 52 36 66 SULFIDB TOTAL (MG/L AS S) <0.5 -- -- <0.5 -- "" BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) 100 -- -- <100 -- -- OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 12 14 <10 -- 17 <10 SULFATB DIS- SOLVED (MG/L AS SO4) 6.1 -- -- -- -- 6.2 BORON, TOTAL RECOV- ERABLE (UG/L AS B) 20 -- -- 40 -- -- COLI- FORM, FECAL, 0.45 UM-MF (COLS./ 100 ML) 2500 4300 750 3500 4300 1100 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 17 -- -- -- -- 16 CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- <1 -- -- STREP- TOCOCCI FECAL, (COLS. PER 100 ML) 210 310 570 K200 2300 1600 FLUO- RIDB, DIS- SOLVED (MG/L AS F) 0.10 -- -- -- -- 0.20 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) <1 -- -- <1 -- -- K = non-ideal count 322 RIO GUAYANES BASIN 50086500 RIO GUAYANES ABOVE MODTH AT PLAYA DE GUAYANES, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE OCT 1993 21. .. DEC 15. .. FBB 1994 16. . . APR 12. .. OUN 27. .. AUG 04. .. COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) 10 -- -- <10 -- -- IRON, TOTAL RECOV- ERABLE (UG/L AS FB) 2000 -- -- 410 -- -- LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) 2 -- -- <1 -- -- MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) 230 -- -- 150 -- -- MERCURY TOTAL RECOV- ERABLE (UG/L AS HG) <0.10 — -- <0.10 __ -- SELE- NIUM, TOTAL (UG/L AS SB) <1 -- -- <1 -- -- SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) <1 __ -- <1 -- -- ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) <10 -- -- <10 -- -- CYANIDE TOTAL PHENOLS (MG/L TOTAL AS CN) (UG/L) <0.010 <1 __ __ <0.010 4 __ __ METHY- LBNB BLUB ACTIVE SUB- STANCE (MG/L) 0.03 -- -- 0.04 -- -- RIO MAUNABO BASIN 50090500 RIO MAUNABO AT LIZAS, PR LOCATION.--Lat 18°01'38", long 65°56'24", Hydrologic Unit 21010005, on right bank, off Highway 759 at Lizas, about 1.0 mi (1.6 km) downstream from Quebrada Coroco, and about 3.0 mi (4.8 km) northwest of Maunabo. 323 DRAINAGE AREA.--5.38 mi" (13.93 km"). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--February 1971 to January 1985, February 1991 to current year. GAGE.—Water-stage recorder and crest-stage gage. Elevation of gage is 230 ft (70 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharges and Mar. 20 to July 6, which are poor. Gage-height and precipitation satellite telemetry at station. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES NOV DEC JAN PEB MAR JUN AUG 1 14 8.0 2 11 7.7 3 10 7.5 4 11 7.3 5 10 7.3 6 e!4 7.1 7 ell 7.4 8 11 8.0 9 11 7.9 10 9.9 8.0 11 9.5 7.5 12 9.2 7.2 13 9.0 7.4 14 8.5 12 15 8.0 11 16 11 35 17 9.9 27 18 9.2 23 19 9.1 45 20 9.2 19 21 8.9 13 22 9.9 16 23 9.5 12 24 8.9 11 25 8.6 11 26 10 18 27 8.5 12 28 24 11 29 10 10 30 8.8 32 31 8.3 TOTAL 320.9 416.3 MEAN 10.4 13.9 MAX 24 45 MIN 8.0 7.1 AC-FT 637 826 CFSM 1.92 2.58 IN. 2.22 2.88 STATISTICS OF MONTHLY MEAN MEAN 27.1 31.3 MAX 52.6 88.9 (WY) 1979 1978 MIN 10.4 7.46 (WY) 1994 1982 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN-DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE ANNUAL RUNOFF (AC-FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 12 10 9.6 10 9.8 9.6 8.9 8.5 9.3 8.2 7. 6 7.5 8.6 8.1 7.8 7.7 7.5 7.4 7.3 7.4 7.1 7.3 7.3 7.5 7.1 6.9 9.1 15 8.8 13 9.0 270.9 8.74 15 6.9 537 1.62 1.87 DATA 17.6 35.2 1978 8.74 1994 FOR 17 19 11 10 10 8.9 8.5 9.1 8.5 7.9 8.9 8.4 8.8 7.8 7.4 7.3 8.0 7.7 7.4 7.0 6.9 6.7 6.4 6.6 6.8 6.3 6.3 6.7 8.8 7.4 6.7 264.2 8.52 19 6.3 524 1.58 1.83 FOR WATER 12.6 27.1 1992 7.79 1981 7.6 7.8 8.2 8.8 8.0 7.2 7.7 7.1 6.7 7.5 8.9 6.7 6.3 15 8.8 13 11 8.2 43 100 21 18 14 13 15 12 11 10 ___ ___ --- 411.5 14.7 100 6.3 816 2.73 2.85 YEARS 1971 11.2 24.5 1982 6.10 1979 10 9.8 12 9.2 8.6 8.0 8.8 8.1 8.6 9.1 12 15 9.0 7.7 7.1 8.0 8.1 7.9 7.7 7.6 7.3 7.2 8.0 7.1 6.9 7.4 7.2 8.0 8.3 9.2 6.8 265.7 8.57 15 6.8 527 1.59 1.84 - 1994 9.49 18.9 1976 4.32 1979 1993 CALENDAR YEAR 5249. 14. 577 3. 4. 10410 2. 36. 21 9. 5. 7 4 Jul 11 5 Jun 6 2 Jun 1 67 30 9 1 6.1 5.9 6.2 5.7 5.5 5.3 5.4 5.1 4.9 4.8 9.6 6.1 5.0 5.1 14 7.7 6.6 7.0 5.9 5.7 5.6 12 6.8 6.6 5.8 5.4 5.3 5.3 5.5 5.2 --- 191.1 6.37 14 4.8 379 1.18 1.32 , BY WATER 7.08 10.8 1976 3.92 1979 5.1 5.1 5.6 7.0 6.3 6.0 5.6 6.7 14 118 13 8.1 37 21 13 50 17 10 8.8 7.9 7.3 7.0 6.6 6.2 8.9 6.4 5.9 5.9 6.6 5.9 6.1 438.0 14.1 118 5.1 869 2.63 3.03 YEAR (WY) 13.5 25.1 1979 5.13 1974 5.5 5.0 5.3 6.8 5.0 6.7 5.1 4.9 4.9 4.7 4.8 5.3 4.7 4.4 11 6.2 14 12 8.5 5.8 5.1 4.6 4.4 4.3 5.1 50 8.9 10 7.9 8.9 --- 239.8 7.99 50 4.3 476 1.49 1.66 17.3 47.1 1979 4.40 1974 FOR 1994 WATER YEAR 3932.7 10.8 270 4.2 4.5 9950 17.46 7800 2.00 27.19 14 7.8 5.2 Sep 20 Jul 6 Jul 11 Sep 20 Sep 20 6.2 5.4 5.3 4.8 4.5 e4.2 e5.8 e5.6 e5.2 e4.9 e4.7 e5.0 e4.4 e4.2 e4.4 e4.5 e4.5 e44 ell e7.2 e6.2 e5.8 e5.6 e5.0 e4.9 e5.6 e5.8 e5.2 e5.4 e5.2 e7.8 208.3 6.72 44 4.2 413 1.25 1.44 17.8 40.2 1993 3.70 1974 WATER 17. 36, 10, 2480 2, 2, 9950 17, 12940 3, 45. 32 11 5, e7.0 e6.0 e6.0 e7.8 e!2 e8.0 e7.6 e7.4 e8.8 e8.8 e8.0 e7.0 e6.4 e6.2 e6.2 e6.2 e5.6 e!7 elO e7.4 e6.6 e6.6 e6.4 e7.0 e!8 e7.6 e8.0 e7.2 e7.0 e6.6 e6.4 246.8 7.96 18 5.6 490 1.48 1.71 23.3 131 1979 6.18 1974 YEARS 1971 .9 .7 .8 Aug .2 Jul .8 Jul Sep . 4 6 Sep .32 .12 .2 e6.6 e!5 e8.8 e9.6 e7.6 e22 e!4 ell elO ell e9.0 e8.0 e7.6 e7.2 e86 e22 e!3 e!2 el4 e270 e!9 e!2 elO e9.4 e8.6 e7.6 e7.2 e7.2 e7.2 e6.6 --- 659.2 22.0 270 6.6 1310 4.08 4.56 25.1 81.5 1979 7.99 1980 - 1994 1979 1994 31 1979 16 1974 11 1974 20 1994 20 1994 e Estimated 324 RIO MAONABO BASIN 50091000 RIO MAONABO AT MAONABO, PR HATER-QUALITY RECORDS LOCATION.--Lat 18°00'24", long 65°54'19" / at bridge on Highway 3, 0.4 mi (0.6 km) southwest of Maunabo plaza, and 1.3 mi (2.1 km) upstream from mouth. DRAINAGE AREA.--12.4 mi 9 (32.1 km 9 ). PERIOD OF RECORD.--Hater years 1958-66, 1975 to current year. HATER-QUALITY DATA, HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE OCT 1993 20. . . DEC 16... FBB 1994 15. . . APR 06. .. JUN 15. .. AUG 04. .. DATE OCT 1993 20. .. DEC 16... FBB 1994 15. .. APR 06... JUN 15... AUG 04. .. DATE OCT 1993 20. . . DEC 16. . . FBB 1994 15. . . APR 06. . . JUN 15. . . AUG 04. . . TIME 1145 1015 0825 0835 0820 0840 HARD- NESS TOTAL (MG/L AS CACO3 ) 82 -- -- -- -- 78 SILICA, DIS- SOLVED (MG/L AS SIO2) 35 -- -- -- -- 38 DIS- CHARGE, INST. CUBIC FEET PER SECOND 8.8 9 14 8.8 9.4 7.3 CALCIUM DIS- SOLVED (MG/L AS CA) 13 -- -- -- -- 19 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 131 -- -- -- -- 168 SPE- CIFIC CON- DUCT- ANCE (US/CM) 223 250 242 270 260 257 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 6.8 -- -- -- -- 7.3 SOLIDS, DIS- SOLVED (TONS PER DAY) 3.11 -- -- -- -- 3.29 PH HATER WHOLE FIELD (STAND- ARD UNITS) 7.5 7.4 7.5 7.4 7.4 7.2 SODIUM, DIS- SOLVED (MG/L AS NA) 25 -- -- -- -- 22 RESIDUE TOTAL AT 105 DBG. C, SUS- PENDED (MG/L) 9 5 13 21 44 1 TEMPER- ATURE HATER (DBG C) 28.5 23.0 23.5 25.0 25.0 27.5 SODIUM AD- SORP- TION RATIO <1 -- -- -- -- 1 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.30 0.40 0.30 0.20 <0.20 <0.20 TUR- BID- ITY (NTU) -- 2.1 3.2 -- 25 1.0 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 1.9 -- -- -- -- 2.1 PHOS- PHORUS TOTAL (MG/L AS P) 0.060 0.050 0.160 0.130 0.080 0.050 OXYGEN, DIS- SOLVED (MG/L) 5.8 6.1 2.4 6.0 5.0 4.2 ALKA- LINITY HAT HH TOT PET FIELD MG/L AS CACO3 87 89 84 94 87 82 ARSENIC TOTAL (UG/L AS AS) <1 -- -- <1 -- -- OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 74 71 28 71 59 52 SULFIDB TOTAL (MG/L AS S) <0.5 -- -- 0.6 -- " BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) 100 -- -- <100 -- -- OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) -- 12 92 -- <10 20 SULPATE DIS- SOLVED (MG/L AS SO4) 8.7 -- -- -- -- 9.5 BORON, TOTAL RECOV- ERABLE (UG/L AS B) 30 -- -- 30 -- -- COLI- FORM, FECAL, 0.45 UM-MF (COLS./ 100 ML) K7000 16000 2100 320 K1800 2000 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 29 -- -- -- -- 21 CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- <1 -- -- STREP- TOCOCCI FECAL, (COLS. PER 100 ML) 3600 3100 1000 410 K1800 3200 FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.10 -- -- -- -- 0.20 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) <1 -- -- <1 -- -- K = non-ideal count RIO MAUNABO BASIN 50091000 RIO MAUNABO AT MAUNABO, PR--Continued WATER-QUALITY DATA, HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 325 DATE OCT 1993 20. .. DEC 16. .. FBB 1994 15. .. APR 06... JUN 15. .. AUO 04... COPPER, TOTAL RECOV- ERABLE (UO/L AS CO) IRON, TOTAL RECOV- ERABLE (UO/L AS PE) LEAD, TOTAL RECOV- ERABLE (UO/L AS PB) MANGA- NESE, TOTAL RECOV- ERABLE (UO/L AS MM) MERCURY TOTAL RECOV- ERABLE (UO/L AS HO) SELE- NIUM, TOTAL (UO/L AS SB) SILVER, TOTAL RECOV- ERABLE (UO/L AS AO) ZINC, TOTAL RECOV- ERABLE (UO/L AS ZN) CYANIDE TOTAL (MO/L AS CN) PHENOLS TOTAL (UO/L) MBTHY- LENB BLUE ACTIVE SUB- STANCE (MO/L) 1700 390 <1 100 40 <0.10 <0.10 10 <0.010 <0.010 <0.02 <0.02 326 RIO CHICO BASIN 50091800 RIO CHICO AT PROVIDENCIA, PR WATER-QOALITY RECORDS LOCATION.--Lat 17°59'16", long 66°00'18", at flat low bridge 200 ft (61 m) south of Highway 3, 0.5 mi (0.8 km) above mouth, and 1.5 mi (2.4 km) southeast of Patillas plaza. DRAINAGE AREA.--4.9 mi' (12.8 km9 ). PERIOD OF RECORD.--Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE OCT 1993 29. .. DEC 17. .. FEB 1994 24. .. MAY 02. . . JUN 28. . . AUG 15. . . DATE OCT 1993 29. .. DEC 17. .. FEB 1994 24. . . MAY 02. . . JUN 28. .. AUG 15. .. DATE OCT 1993 29. . . DEC 17. . . FEB 1994 24. . . MAY 02. .. JUN 28. . . AUG 15. .. TIME 0850 1315 0830 0835 0815 1000 HARD- NESS TOTAL (MG/L AS CAC03 ) 87 -- -- 73 -- 69 SILICA, DIS- SOLVED (MG/L AS SIO2) 30 -- -- 26 -- 25 DIS- CHARGE, INST. CUBIC FEET PER SECOND 3.4 4.5 4.1 0.74 2.9 0.0 CALCIUM DIS- SOLVED (MG/L AS CA) 20 -- -- 19 -- 18 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 184 -- -- 229 -- 219 SPE- CIFIC CON- DUCT- ANCE (US /CM) 407 340 322 409 348 418 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 8.9 -- -- 6.1 -- 5.9 SOLIDS, DIS- SOLVED (TONS PER DAY) 1.68 -- -- 0.46 -- -- PH WATER WHOLE FIELD (STAND- ARD UNITS) 7.6 7.4 7.6 7.0 7.2 6.8 SODIUM, DIS- SOLVED (MG/L AS NA) 30 -- -- 49 -- 50 RESIDUE TOTAL AT 105 DEG. C, SUS- PENDED (MG/L) 11 82 8 10 33 3 TEMPER- ATURE WATER (DEG C) 26.5 30.0 23.0 28.5 25.5 30.5 SODIUM AD- SORP- TION RATIO 1 -- __ 3 __ 3 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.60 <0.20 1.0 2.3 1.4 1.4 TUR- BID- ITY (NTU) 2.8 52 4.0 2.7 5.0 0.70 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 2.0 -- -- 9.1 -- 9.0 PHOS- PHORUS TOTAL (MG/L AS P) 0.490 0.030 0.880 4.30 1.10 2.90 OXYGEN, DIS- SOLVED (MG/L) 7.1 4.2 4.7 2.4 2.4 1.0 ALKA- LINITY WAT WH TOT FET FIELD MG/L AS CAC03 130 140 94 69 100 56 ARSENIC TOTAL (UG/L AS AS) <1 -- — <1 -- -- OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 88 55 54 30 29 13 SULFIDE TOTAL (MG/L AS S) <0.5 -- -- 1.2 -- -- BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 _- -- 100 -- -- OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 17 19 32 47 23 42 SULFATE DIS- SOLVED (MG/L AS S04) 12 -- -- 28 -- 27 BORON, TOTAL RECOV- ERABLE (UG/L AS B) 40 -- — 120 -- -- COLI- FORM, FECAL, 0.45 UM-MF (COLS./ 100 ML) K130 470000 660 2600 61000 2400 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 19 -- -- 50 -- 50 CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- <1 -- -- STREP- TOCOCCI FECAL, (COLS. PER 100 ML) K120 6400 470 21000 41000 3600 FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.20 -- -- <0.10 -- 0.20 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) <1 -- -- <1 -- -- K = non-ideal count RIO CHICO BASIN 50091800 RIO CHICO AT PROVIDENCIA, PR—Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 327 DATE COPPER, TOTAL RECOV- ERABLE (DG/L IRON, TOTAL RECOV- ERABLE (DG/L LEAD, TOTAL RECOV- ERABLE (DG/L MANGA- NESE, TOTAL RECOV- ERABLE (DG/L MERCURY TOTAL RECOV- ERABLE (DG/L SELE- NIUM, TOTAL (DG/L SILVER, TOTAL RECOV- ERABLE (DG/L ZINC, TOTAL RECOV- ERABLE (UG/L CYANIDE TOTAL (MG/L PHENOLS TOTAL METHY- LENE BLDE ACTIVE SUB- STANCE AS CD) AS FE) AS PB) AS MN) AS HG) AS SB) AS AG) AS ZN) AS CN) (DG/L) (MG/L) OCT 1993 29... DEC 17. .. FEB 1994 24... MAY 02... JUN 28. .. ADG 15. . . 440 100 20 30 <0.10 <0.10 20 20 <0.010 <0.010 0.04 0.09 328 RIO QRANDE DE PATILLAS BASIN 50092000 RIO ORANDB 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 1 (47.4 km 1 ). HATBR-DISCHAROB RECORDS PERIOD OP 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 poor. Gage-height and precipitation satellite telemetry at station. DISCHARGE, CUBIC FEET PER SECOND, HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY OCT NOV DEC JAN FEE MAR APR MAY JUN AUG SEP 1 39 20 2 27 20 3 23 19 4 23 19 5 21 18 6 50 18 7 31 18 8 24 20 9 22 19 10 21 22 11 21 21 12 21 18 13 21 18 14 21 24 15 21 21 16 21 30 17 22 35 18 20 50 19 19 48 20 20 31 21 21 31 22 25 41 23 26 23 24 23 21 25 24 18 26 24 27 27 21 25 28 22 19 29 22 17 30 21 34 31 20 TOTAL 737 745 MEAN 23.8 24.8 MAX 50 50 MIN 19 17 AC-FT 1460 1480 CFSM 1.30 1.36 IN. 1.50 1.51 STATISTICS OF MONTHLY MEAN MEAN 101 94.0 MAX 593 393 (HY) 1971 1978 MIN 14.4 16.1 (HY) 1968 1968 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN-DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE INSTANTANEOUS LOH FLOW ANNUAL RUNOFF (AC-FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 26 23 23 23 23 21 20 18 18 18 16 16 17 16 15 15 15 15 14 14 14 14 14 14 14 14 15 19 16 16 14 530 17.1 26 14 1050 .93 1.08 DATA 52.1 152 1971 8.63 1968 FOR 18 19 17 18 19 16 14 14 15 18 15 15 17 18 15 14 14 15 13 13 12 12 11 11 11 11 10 10 11 11 9.9 436.9 14.1 19 9.9 867 .77 .89 FOR HATER 34.3 125 1992 14.0 1973 9.9 11 10 11 11 9.9 10 9.7 8.9 9.8 11 9.0 8.8 13 13 11 11 11 14 126 37 31 31 35 26 24 23 25___ ___ --- 561.0 20.0 126 8.8 1110 1.09 1.14 YEARS 1966 27.9 94.6 1982 7.09 1973 25 25 26 23 22 21 21 20 20 26 22 22 20 19 18 18 17 17 16 16 16 15 15 15 15 15 15 14 16 16 14 580 18.7 26 14 1150 1.02 1.18 - 1994 23.9 43.8 1972 6,74 1968 1993 CALENDAR YEAR 16598 45. 1700 11 12 32920 2. 33. 77 23 14 5 Jul 11 May 13 Apr 2 48 74 13 13 13 13 12 13 14 13 12 12 14 13 11 11 13 12 12 14 11 10 10 13 11 11 10 9.5 9.5 9.7 9.3 9.0 --- 351.0 11.7 14 9.0 696 .64 .71 8.8 8.5 8.7 10 12 12 10 10 52 113 35 22 25 19 25 21 16 15 14 13 13 12 12 11 12 11 11 10 11 9.8 10 572.8 18.5 113 8.5 1140 1.01 1.16 9.8 9.3 9.2 10 9.4 29 13 11 11 9.9 9.8 11 9.5 9.0 19 18 30 27 17 13 11 10 10 9.6 10 108 26 20 17 23 529.5 17.6 108 9.0 1050 .96 1.08 18 16 21 24 18 16 17 16 13 12 11 10 9.6 9.1 8.7 8.6 9.2 115 22 14 12 11 10 10 11 10 10 elO elO ell ell 504.2 16.3 115 8.6 1000 .89 1.02 e!7 11 12 12 13 12 12 12 12 20 26 14 12 12 11 10 9.7 30 23 15 15 18 16 48 58 17 14 13 14 12 14 534.7 17.2 58 9.7 1060 .94 1.09 21 24 20 18 18 29 28 24 26 24 73 35 23 20 68 43 29 21 65 353 56 25 20 20 15 16 13 12 11 11 --- 1161 38.7 353 11 2300 2.11 2.36 , BY HATER YEAR (WY) 22.1 43.4 1976 9.98 1968 FOR 1994 7243 19 353 8 9 987 7 14370 1 14 27 16 10 53.6 172 1969 10.3 1974 HATER YEAR .1 .8 Sep 20 .5 May 2 .1 Apr 27 Sep 20 .28 Sep 20 .08 .72 65.9 200 1979 13.1 1974 66.3 164 1979 14.1 1974 HATER 57 117 19 4780 4 5 30900 4 41630 3 42 98 28 12 71.3 231 1979 17.2 1994 YEARS 1966 - .5 .8 Sep 16 .8 May 9 .0 Apr 10 Jan 5 .6 May 13 .14 .66 83.8 314 1979 12.1 1967 1994 1979 1994 1975 1968 1968 1992 1968 e Estimated RIO GRANDE DE PATILIAS BASIN 50092000 RIO GRANDB DE PATILLAS NEAR PATILLAS, PR (National stream-quality accounting network station) WATER-QUALITY RECORDS PERIOD OF RECORD.--Water years 1960 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 329 DATE OCT 1993 29.. . DEC 17. .. PBB 1994 24.. . MAY 02.. . JUN 28.. . AUG 15.. . TIME 1055 1110 1035 1040 1005 0855 DIS- CHARGE, INST. CUBIC FEET PER SECOND 22 40 36 9.0 21 11 SPE- CIFIC CON- DUCT- ANCE (US/CM) 170 161 129 177 139 154 PH WATER WHOLE FIELD (STAND- ARD UNITS) 7.6 8.2 7.3 7.8 7.0 7.9 TEMPER- ATURE WATER (DEG C) 26.0 24.5 23.5 28.5 26.0 27.0 TUR- BID- ITY (NTU) 0.60 3.0 1.0 0.40 1.6 0.30 OXYGEN, DIS- SOLVED (MG/L) 7.7 8.3 8.5 8.4 3.2 8.4 OXYGEN, OXYGEN DIS- DEMAND, SOLVED CHEM- (PER- ICAL CENT (HIGH SATUR- LEVEL) ATION) (MG/L) 94 <10 99 <10 98 <10 106 <10 39 <10 103 <10 COLI- FORM, FECAL, 0.45 UM-MF (COLS./ 100 ML) 830 290 320 K110 210 140 STREP- TOCOCCI FECAL, (COLS. PER 100 ML) 430 110 160 K150 K1600 30000 HARD- NESS TOTAL (MG/L AS CAC03 ) 51 -- -- 55 -- 52 MAGNB- CALCIUM SIUM, SODIUM, DIS- DIS- DIS- SOLVED SOLVED SOLVED OCT 1993 29.. . DEC 17.. . FEB 1994 24.. . MAY 02.. . JUN 28.. . AUG 15.. . (MG/L 12 13 13 (MG/L (MG/L AS CA) AS MG) AS NA) 5.2 14 5.5 14 4.8 14 SODIUM AD- SORP- TION RATIO ALKA- POTAS- LINITY CHLO- FLUO- SIUM, WAT WH SULFATB RIDE, RIDE, DIS- TOT FET SULFIDE DIS- DIS- DIS- SOLVED FIELD TOTAL SOLVED SOLVED SOLVED (MG/L MG/L AS (MG/L (MG/L (MG/L (MG/L AS K) 0.8 0.80 0.8 0.60 0.8 0.70 CACO3 AS S) AS S04) AS CL) AS F) 52 57 38 62 44 59 <0.5 11 <0.5 13 11 11 13 12 SOLIDS, SILICA, SUM OF DIS- CONSTI- SOLVBD TUENTS, (MG/L DIS- AS SI02) 0.10 23 <0.10 24 0.10 21 SOLVED (MG/L) 153 120 112 DATE OCT 1993 29. . . DEC 17. .. FEB 1994 24. . . MAY 02. . . JUN 28. . . AUG 15. .. SOLIDS, DIS- SOLVED (TONS PER DAY) 9.08 -- -- 2.93 -- 3.33 RESIDUE TOTAL AT 105 DEG. C, SUS- PENDED (MG/L) 4 21 6 1 1 6 NITRO- GEN, ORGANIC TOTAL (MG/L AS N) -- 0.70 -- 0.50 -- -- NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) <0.20 0.70 <0.20 0.50 <0.20 <0.20 NITRO- GEN, TOTAL (MG/L AS N) __ 0.70 -- 0.50 -- -- PHOS- PHORUS ARSENIC TOTAL TOTAL (MG/L (UG/L AS P) AS AS) 0.010 <1 0.480 <0.010 0.370 <1 0.010 <0.010 BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 -- -- <100 -- -- BORON, TOTAL RECOV- ERABLE (UG/L AS B) 20 -- -- 30 -- -- CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- <1 -- -- CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) <1 -- -- <1 -- -- K = non-ideal count 330 RIO GRANDB DB PATILLAS BASIN 50092000 RIO GRANDB DE PATILLAS NEAR PATILLAS, PR—Continued (National stream-quality accounting network station) WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 COPPER, TOTAL RECOV- ERABLE DATE (UG/L IRON, TOTAL RECOV- ERABLE (UG/L LEAD, TOTAL RECOV- ERABLE (UG/L MANGA- NESE, MERCURY TOTAL TOTAL RECOV- ERABLE (UG/L RECOV- ERABLE (UG/L SELE- NIUM, TOTAL (UG/L SILVER, TOTAL RECOV- ERABLE (UG/L ZINC, TOTAL RECOV- CYANIDE BRABLB TOTAL (UG/L (MG/L MBTHY- LENB BLUE ACTIVE PHENOLS SUB- TOTAL STANCE AS CU) AS FB) AS PB) AS MN) AS HG) AS SB) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1993 29. .. DEC 17. .. FBB 1994 24. .. MAY 02. .. JUN 28. .. AUG 15. .. 50 40 10 <0.10 <0.10 <0.010 10 <0.010 3 <0.02 island **• divide EXPLANATION A1080 SURFACE-WATER STATION AND NUMBER T1065 QUALITY-OF-WATER STATION AND NUMBER WELL AND WELL NUMBER t&re Y 11 Drffliooat ^ IH& bound or y-i .• .J^*J>J4N ^. t-Mop oreo CARIBBEAN SEA 0123456 KILOMETERS 01234 MILES Figure 23.--South coast river basins the Rfo Salinas to Rfo Jacaguas basins. Co Co 332 RIO SALINAS BASIN 50100200 RIO LAPA NEAR RABO DEL BDEY, PR LOCATION.--Lat 18°03'36 M , long 660 14'28 M , 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 current year. GAGE.—Water-stage recorder and crest-stage gage. Elevation of gage is 394 ft (120 m), from topographic map. REMARKS.--Records fair. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES NOV DEC JAN FEB MAR APR JUN JUL AUG SEP 1 4.8 1.1 2 3.5 1.1 3 3.2 1.1 4 2.9 1.0 5 2.6 .99 6 2.5 .99 7 2.4 .99 8 2.3 .97 9 2.2 .94 10 2.1 .94 11 2.0 .94 12 2.0 .92 13 2.0 .88 14 1.9 .88 15 1.9 .96 16 2.0 1.1 17 1.7 1.1 18 1.7 1.4 19 1.7 1.3 20 1.7 1.1 21 1.6 1.1 22 1.7 1.0 23 1.5 .99 24 1.4 1.0 25 1.4 1.1 26 1.4 1.2 27 1.3 1.4 28 1.3 1.3 29 1.3 1.1 30 1.3 1.2 31 1.2 --- TOTAL 62.5 32.09 MEAN 2.02 1.07 MAX 4.8 1.4 MIN 1.2 .88 AC-FT 124 64 CFSM .20 .11 IN. .23 .12 1.1 1.1 1.1 .99 .99 .99 .98 .94 .94 .94 .94 .94 1.1 1.4 1.1 .92 .82 .79 .82 .80 .74 .74 .72 .69 .69 .69 .69 .69 .72 .75 .69 27.51 .89 1.4 .69 55 .09 .10 STATISTICS OF MONTHLY MEAN DATA MEAN 16.3 6.86 MAX 76.1 28.4 (WY) 1991 1991 MIN 1.46 1.07 (WY) 1992 1994 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN- DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE INSTANTANEOUS LOW FLOW ANNUAL RUNOFF (AC-FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 2.12 6.09 1991 .89 1994 FOR .64 .62 .61 .57 .56 .56 .50 .50 .50 .49 .47 .49 .49 .47 .47 .47 .44 .44 .44 .44 .44 .47 .44 .44 .41 .39 .38 .35 .36 .36 .37 14.58 .47 .64 .35 29 .05 .05 .38 .40 .41 .37 .32 .33 .34 .33 .32 .32 .31 .31 .27 .28 .28 .28 .28 .28 .28 .30 .30 .32 .33 .32 .31 .32 .32 29 ___ ___ --- 37.61 1.34 29 .27 75 .13 .14 FOR WATER YEARS 1988 12.7 68.8 1992 .47 1994 3.22 12.4 1991 .49 1990 2.0 .90 .71 .60 .56 .49 .45 .41 .45 .49 .45 .44 .43 .43 .41 .39 .38 .38 .36 .35 .33 .31 .32 .31 .35 .34 .33 .35 .34 .33 .32 14.71 .47 2.0 .31 29 .05 .05 - 1994 1.05 2.08 1992 .44 1990 1993 CALENDAR YEAR 1062. 2. 129 2110 3. 3. 1. 00 91 Jul 11 46 Apr 6 50 Apr 4 29 95 5 2 73 .32 .30 .31 .29 .32 .51 .37 .32 .28 .28 .36 .35 .38 .36 .36 .34 .34 .37 .37 .37 .35 .35 .32 .40 .37 .35 .32 .28 .26 .21 --- 10.11 .34 .51 .21 20 .03 .04 .19 .16 .16 .17 .15 .13 .12 .10 .09 .18 .11 .10 .10 .08 .08 .08 .08 .07 .08 .06 .03 .03 .03 .02 .02 .04 .04 .04 .04 .05 .04 2.67 .086 .19 .02 5.3 .01 .01 .03 .04 .04 .03 .04 .07 .06 .05 .06 .05 .06 .06 .06 .04 .03 .03 .05 .04 .03 .02 .02 .02 .01 .00 .00 .01 .01 .03 .04 .04 --- 1.07 .036 .07 .00 2.1 .00 .00 .04 .01 .01 .00 .01 .02 .03 .01 .01 .01 .00 .01 .00 .00 .00 .00 .00 .06 .04 .01 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 0.27 .009 .06 .00 .5 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .01 .00 .00 .00 .00 .00 .01 .02 .00 .00 .00 .00 .00 .00 0.04 .001 .02 .00 .08 .00 .00 .04 .04 .04 .05 .05 .12 .07 .03 .01 .01 .05 .00 .00 .00 .01 .00 .00 .00 .00 1.8 .35 .15 .12 .16 .12 .08 .04 .01 .00 .00 --- 3.35 .11 1.8 .00 6.6 .01 .01 , BY WATER YEAR (WY) 1.06 3.07 1992 .28 1990 FOR 1994 206. 29 . . 677 9. . 410 . 1. . . 6.72 36.6 1992 .086 1994 WATER YEAR 51 57 Feb 28 00 Jun 24 00 Jul 21 Feb 28 17 Feb 28 00 Jun 22 057 77 3 32 00 3.11 10.4 1993 .036 1994 1.96 7.80 1993 .009 1994 WATER 5 11 1080 15700 17 3930 7 6 1 2.40 6.06 1990 .001 1994 YEARS 1988 - .43 .2 .57 Jan 5 .00 Jun 24 .00 Jul 21 Jan 5 .82 Jan 5 .00 Jun 22 .54 .37 .3 .1 .13 7.27 29.1 1989 .11 1994 1994 1991 1994 1992 1994 1994 1992 1992 1994 50100450 RIO SALINAS BASIN RIO MAJAOA AT LA PLENA, PR 333 LOCATION.--Lat 18°02'40", long 66°12'27", Hydrologic Unit 21010004, on right bank, upstream side of bridge on Hwy 712, about 0.3 mi (0.5 km) southwest of La Plena. DRAINAGE AREA.--16.7 mi 1 (43.3 km 1 ). HATER-DISCHARGE RECORDS PERIOD OF RECORD.—January 1973 to April 1979 (montly measurements only), September 1988 to current year. GAGE.--Hater-stage recorder. Elevation of gage is 410 ft (125 m), from topographic map. REMARKS.-Records fair except those for estimated daily discharges, which are poor. Some regulation at low flow upstream from station by local residents for agricultural purposes. DISCHARGE, CUBIC FEET PER SECOND, HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY OCT NOV DEC JAN APR MAY JUN JUL SEP 1 9.0 el. 6 2 4.7 el. 6 3 3.7 el. 5 4 3.1 el. 4 5 2.7 el. 4 6 2.8 el. 4 7 2.7 el. 4 8 2.4 el. 3 9 2.1 el. 3 10 1.9 el. 3 11 1.9 el. 4 12 2.0 el. 3 13 2.0 el. 2 14 1.9 el. 3 15 1.7 el. 4 16 1.7 el. 6 17 3.9 el. 6 18 3.2 e2.0 19 e2.4 el. 9 20 e2.4 el. 6 21 e2.3 el. 6 22 e2.4 el. 4 23 e2.2 el. 4 24 e2.0 el. 4 25 e2.0 el. 6 26 e2.0 el. 7 27 el. 8 e2.0 28 el. 8 el. 9 29 el. 8 el. 6 30 el. 8 el. 7 31 el. 7 TOTAL 80.0 45.8 MEAN 2.58 1.53 MAX 9.0 2.0 MIN 1.7 1.2 AC-PT 159 91 CPSM .15 .09 IN. .18 .10 STATISTICS OP MONTHLY MEAN MEAN 16.1 8.43 MAX 76.4 25.2 (WY) 1991 1991 MIN 1.43 1.53 (WY) 1992 1994 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN- DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE ANNUAL RUNOFF (AC-PT) ANNUAL RUNOFF (CPSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS el. 6 el. 6 el. 6 el. 4 el. 4 el. 4 el. 4 el. 3 el. 3 el. 3 el. 4 el. 4 el. 6 e2.0 el. 6 el. 3 el. 3 el. 3 el. 2 el. 3 el. 3 el. 2 el. 2 el. 2 el.l el.l el.l el.l el.l el. 2 el. 3 41.6 1.34 2.0 1.1 83 .08 .09 DATA 3.81 9.67 1991 1.22 1990 FOR el. 2 el.l el. 3 1.2 1.2 1.2 .99 .92 .89 1.0 1.1 .92 1.0 1.6 1.2 .97 .84 .88 .78 .65 .60 .56 .53 .62 .65 .65 .53 .53 .49 .44 .43 26.97 .87 1.6 .43 53 .05 .06 FOR HATER 13.7 68.8 1992 .87 1994 .42 .47 .71 .75 .80 .69 .48 .53 .47 .37 .46 .49 .37 .43 1.3 .68 .57 .44 .40 .43 .72 .75 .65 .89 .74 .75 .73 20 --- ___ --- 36.49 1.30 20 .37 72 .08 .08 YEARS 1973 3.78 12.1 1991 .63 1990 10 3.7 2.1 1.6 1.4 1.2 .92 .89 .81 .99 1.2 1.0 1.1 .88 .88 .91 .79 .57 .59 .58 .54 .53 .50 .49 .46 .47 .52 .47 .44 .48 .46 37.47 1.21 10 .44 74 .07 .08 - 1994 1.96 3.92 1991 .59 1990 1993 CALENDAR YEAR 1431. 3. 152 2840 3. 6. 2. 1. 91 92 Jul 11 54 Apr 8 67 Apr 2 23 19 3 1 1 .41 .43 .39 .34 .35 .46 .53 .45 .43 .35 .74 .77 .53 .39 .36 .33 .30 .32 .30 .28 .25 .23 .18 .25 .28 .29 .28 .33 .31 .22 --- 11.08 .37 .77 .18 22 .02 .02 .20 .18 .18 .17 .17 .17 .18 .19 .18 1.9 1.1 .23 .17 .15 .14 .13 .12 .11 .11 .11 .13 .12 .09 .06 .04 .03 .02 .01 .02 .01 .01 6.43 .21 1.9 .01 13 .01 .01 .01 .01 .01 .01 .01 .01 .02 .10 .06 .04 .04 .05 .05 .04 .04 .04 .05 .05 .05 .05 .05 .05 .06 .04 .03 .04 .05 .05 .07 .08 --- 1.26 .042 .10 .01 2.5 .00 .00 .08 .08 .07 .08 .10 .10 .10 .10 .09 .10 .10 .11 .11 .10 .10 .10 .09 .15 1.8 .54 .23 .16 .13 .12 .11 .09 .07 e.08 e.Ol e.Ol e.Ol .01 .01 .01 .01 .01 .01 .01 .01 .01 .01 .01 .01 .01 .01 .01 .01 .01 .01 .01 .01 .01 .01 .01 .01 .02 .01 .01 .01 .01 .01 .01 5.12 0.32 .17 .010 1.8 .02 .01 .01 10 .6 .01 .00 .01 .00 e.04 e.04 e.04 e.05 e.05 e.10 e.07 e.03 e.Ol e.Ol e.05 el.l e.20 e.15 e. 10 e.07 e.05 e.04 e.03 el. 2 e.50 e.20 e.10 e.15 e.09 e.08 e.04 e.03 e.02 e.02 --- 4.66 .16 1.2 .01 9.2 .01 .01 , BY HATER YEAR (WY) 1.70 3.69 1992 .37 1994 FOR 1994 297 20 142 4 589 1 5.32 25.5 1992 .21 1994 HATER YEAR 20 81 Feb 28 01 May 28 01 May 30 Feb 28 64 Peb 28 049 66 8 46 01 4.14 12.1 1992 .042 1994 3.59 2.70 12.9 7.74 1993 1992 .17 .010 1994 1994 HATER YEARS 1973 6.16 12.1 .81 1520 Jan .01 May . 0 1 May 1520 Jan 17.19 Jan 4460 .37 5.01 8.6 2.0 .31 8.40 30.1 1989 .16 1994 - 1994 1992 1994 5 1992 28 1994 30 1994 5 1992 5 1992 e Estimated 334 RIO COAHO BASIN 50106100 RIO COAMO AT COAHO, PR LOCATION.--Lat 18°05'00", long 66°21'16", Hydrologic Unit 21010004, on Highway 14 bridge, 0.8 mi (1.3 km) northeast from Parque Atletico, 1.2 mi (1.9 km) southeast from (W.C.P.R.) Antena de Radio. DRAINAGE AREA.--3.5 mi* (112.7 km 2 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--January 1987 to current year. GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 335 ft (110 m), from topographic map. REMARKS.--Records poor. Low flow is affected by domestic discharges about 200 ft (65.6 m), upstream from gaging station. Gage-height and precipitation satellite telemetry at station. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY OCT NOV DEC JAN FEB MAY JUN JUL ADG SEP 1 29 8.3 2 16 9.1 3 14 8.4 4 18 7.7 5 16 18 6 14 8.6 7 13 7.3 8 12 7.5 9 12 7.4 10 11 7.3 11 11 6.5 12 10 6.3 13 10 6.0 14 9.6 6.9 15 9.2 7.5 16 9.6 12 17 23 11 18 16 12 19 11 14 20 10 11 21 9.3 9.5 22 9.9 8.3 23 9.6 7.9 24 9.8 7.5 25 9.3 7.7 26 8.1 8.1 27 18 8.6 28 20 10 29 15 8.3 30 10 7.5 31 8.7 --- TOTAL 402.1 266.2 MEAN 13.0 8.87 MAX 29 18 MIN 8.1 6.0 AC-FT 798 528 CFSM .30 .20 IN. .34 .23 STATISTICS OF MONTHLY MEAN MEAN 65.2 31.1 MAX 274 62.9 (WY) 1991 1988 MIN 10.3 8.62 (WY) 1989 1992 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN- DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE INSTANTANEOUS LOW FLOW ANNUAL RUNOFF (AC-FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 7.1 7.0 6.3 6.9 7.3 7.0 6.3 6.3 6.1 6.5 5.8 6.5 7.6 17 11 7.7 7.2 6.5 6.2 5.9 5.9 5.7 5.5 5.4 5.3 5.5 5.4 5.3 5.2 5.2 5.0 207.6 6.70 17 5.0 412 .15 .18 DATA 21.2 83.8 1988 3.72 1989 FOR 5.4 5.3 5.1 4.8 4.6 4.7 4.3 4.3 4.5 4.2 3.8 4.2 4.0 4.2 4.1 4.1 4.0 4.0 3.9 3.8 3.8 3.7 3.7 3.6 3.2 3.1 3.2 3.1 3.0 3.2 3.0 123.9 4.00 5.4 3.0 246 .09 .11 FOR WATER 22.7 79.0 1992 2.85 1989 2.9 3.0 3.2 2.6 2.9 3.1 3.2 3.0 2.7 2.7 2.5 2.4 2.9 3.0 2.8 2.9 2.9 2.6 2.4 3.3 2.6 2.6 2.8 2.6 2.6 2.6 3.0 31 ___ ___ 106.8 3.81 31 2.4 212 .09 .09 YEARS 1987 9.49 17.0 1988 3.17 1989 42 5.4 e3.5 e3.3 3.1 3.2 3.2 3.1 2.5 2.4 2.5 2.6 2.5 4.1 5.0 2.8 2.5 2.4 2.5 2.3 2.2 2.1 2.0 2.0 2.0 2.0 1.9 1.7 1.7 1.6 1.5 121.6 3.92 42 1.5 241 .09 .10 - 1994 5.88 9.79 1988 3.09 1987 1993 CALENDAR YEAR 4298. 11. 109 3. 4. 8530 3. 17 8. 5. 1 8 Apr 29 8 Apr 2 0 Apr 2 27 68 6 2 1.5 1.6 1.7 1.6 1.7 21 7.2 3.8 3.1 3.1 2.9 3.0 2.7 2.8 2.7 2.7 3.1 2.8 2.5 2.5 2.6 2.5 2.7 2.9 2.8 3.8 4.8 4.2 3.0 3.0 --- 106.3 3.54 21 1.5 211 .08 .09 3.2 3.3 3.6 3.6 3.5 3.6 3.8 3.7 3.2 4.2 3.3 3.1 3.3 3.3 3.5 3.3 3.3 3.6 3.6 3.6 4.0 4.1 3.4 4.0 3.3 2.3 2.5 2.1 2.3 2.1 1.8 101.5 3.27 4.2 1.8 201 .08 .09 1.9 1.4 1.6 1.8 1.8 1.7 1.7 1.7 1.5 1.8 1.9 2.1 2.2 2.3 2.2 2.1 2.3 2.5 2.5 2.5 2.5 2.7 2.6 2.3 2.5 2.9 2.8 2.5 2.3 2.2 64.8 2.16 2.9 1.4 129 .05 .06 2.0 1.8 1.9 2.4 2.3 1.8 2.3 2.1 2.0 2.2 2.9 2.4 2.2 2.3 2.6 2.8 2.4 3.6 2.4 2.2 1.9 1.4 1.4 1.3 1.3 1.4 1.3 1.3 1.1 1.1 1.1 61.2 1.97 3.6 1.1 121 . 05 .05 1.0 1.3 1.3 1.2 1.2 1.1 2.6 1.5 1.3 1.2 1.1 1.2 1.2 1.1 1.0 1. 1 1.1 1.1 1.4 1.5 1.2 1.2 1. 1 1.4 1.5 1.3 1.3 1.3 1.4 1.3 1.2 39.7 1.28 2.6 1.0 79 .03 .03 1.3 1.5 1.9 2.5 .94 1.5 1.0 .95 1.0 .99 1.4 1.3 1.4 1.5 1.7 1.7 1.7 1.8 1.8 2.3 2.4 2.1 2.1 2.5 1.8 1.6 1.5 1.4 1.4 1.3 --- 48.28 1.61 2.5 .94 96 .04 .04 , BY WATER YEAR (WY) 11.4 27.6 1987 2.53 1989 FOR 1994 1649. 4. 42 1. 389 6. 3270 1. 9. 2. 1, 17.4 69.6 1992 1.66 1989 WATER YEAR ,98 ,52 Mar 1 , 94 Sep 5 , 1 Sep 5 Mar 1 ,75 Mar 1 ,10 .41 ,6 ,9 ,3 17.7 76.1 1987 1.99 1989 8.00 15.5 1988 .78 1989 WATER 19 36 4 1580 20800 34 1 14200 6 39 7 2 9.71 23.3 1990 1.28 1994 YEARS 1987 .6 .8 .52 Jan . 67 Aug . 7 0 Jul Sep .40 Sep . 1 Aug .45 .12 .1 .0 23.6 66.6 1989 1.61 1994 - 1994 1991 1994 5 1992 2 1989 27 1989 6 1960 6 1960 21 1990 e Estimated RIO COAMO BASIN 50106500 RIO COAMO NEAR COAMO, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°03'52", long 66°22'10", Hydrologic Unit 21010004, on Highway 153 bridge, 0. Rio de la Mina, and 1.8 mi (2.9 km) south of Coamo plaza. DRAINAGE AREA.--46.0 mi' (119.1 km'). PERIOD OF RECORD.--Water years 1978 to current year. WATER-QUALITY RECORDS, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 335 4 mi (0.6 km) above DATE OCT 1993 13. .. DEC 23. .. FBB 1994 25. .. MAY 04. . . JUN 24. . . AUG 23. . . DATE OCT 1993 13. . . DEC 23. . . PBB 1994 25. . . MAY 04. .. JtfN 24. . . AOG 23. . . DATE OCT 1993 13. .. DEC 23. . . FEB 1994 25. . . MAY 04. .. JtfN 24. . . AOG 23. . . TIME 1230 1100 1210 0825 1025 0820 HARD- NESS TOTAL (MG/L AS CACO3 ) 230 -- -- 250 -- 250 SILICA, DIS- SOLVED (MG/L AS SIO2) 29 -- -- 31 -- 34 DIS- CHARGE, INST. CUBIC FEET PER SECOND 15 13 6.7 5.4 3.5 2.1 CALCIUM DIS- SOLVED (MG/L AS CA) 60 -- -- 67 -- 66 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 377 -- -- 404 -- 390 SPE- CIFIC CON- DUCT- ANCE (US /CM) 623 686 644 669 782 589 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 19 -- -- 20 -- 20 SOLIDS, DIS- SOLVED (TONS PER DAY) 15.6 -- -- 5.93 -- 2.24 PH WATER WHOLE FIELD (STAND- ARD UNITS) 7.5 7.8 7.4 7.5 7.5 7.5 SODIUM, DIS- SOLVED (MG/L AS NA) 38 -_ -- 45 -- 41 RESIDUE TOTAL AT 105 DBG. C, SUS- PENDED (MG/L) 8 4 18 5 <1 7 TEMPER- ATURE WATER (DBG C) 30.5 26.5 29.0 26.5 29.0 27.5 SODIUM AD- SORP- TION RATIO 1 -- -- 1 -- 1 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 1.4 3.0 4.5 4.1 4.8 1.0 TUR- BID- ITY (NTU) 0.90 2.4 1.5 0.70 0.80 1.0 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 4.4 -- -- 4.9 -- 4.1 PHOS- PHORUS TOTAL (MG/L AS P) 0.380 0.530 0.430 0.640 0.470 0.460 OXYGEN, DIS- SOLVED (MG/L) 5.0 5.3 9.0 4.0 1.9 1.2 ALKA- LINITY WAT WH TOT PET FIELD MG/L AS CAC03 240 260 220 250 290 250 ARSENIC TOTAL (UG/L AS AS) <1 -- -- 1 -- -- OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 71 66 85 49 24 15 SULFIDE TOTAL (MG/L AS S) <0.5 -- -- <0.5 -- " BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) 100 -- -- <100 -- -- OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) <10 25 17 14 30 14 SULFATE DIS- SOLVED (MG/L AS S04) 40 -- -- 38 -- 33 BORON, TOTAL RECOV- ERABLE (UG/L AS B) 90 -- -- 2900 -- -- COLI- FORM, FECAL, 0.45 UM-MF (COLS./ 100 ML) 510 K86000 5900 14000 K7000 410 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 42 -- -- 48 -- 42 CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- 1 -- -- STREP- TOCOCCI FECAL, (COLS. PER 100 ML) 330 22000 54 2200 K1800 1400 FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.30 -- -- 0.20 -- 0.20 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) <1 -- -- <1 -- -- K = non-ideal count 336 RIO COAMO BASIN DATE OCT 1993 13. .. DEC 23... FBB 1994 25. . . MAY 04. .. JUN 24. .. AUG 23. .. 50106500 RIO COAMO NEAR COAMO, PR—Continued HATER-QUALITY RECORDS, HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) <10 IRON, TOTAL RECOV- ERABLE (UG/L AS PE) 210 LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) 1 MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) 140 MERCURY TOTAL RECOV- ERABLE (UG/L AS HG) <0.10 SELE- NIUM, TOTAL (UG/L AS SB) <t SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) <! ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) <10 CYANIDE TOTAL (MG/L AS CN) <0.010 PHENOLS TOTAL (UG/L) <± MBTHY- LBNB BLUB ACTIVE SUB- STANCE (MG/L) 0.18 50 590 10 420 <0.10 30 <0.010 0.03 RIO DBSCALABRADO BASIN 50108000 RIO DBSCALABRADO NEAR LOS LLANOS, PR 337 LOCATION.--Lat 18°03'08", long 66°25'34", Hydrologic Unit 21010004, at bridge on Highway 14, 1.5 mi (2.4 km) west of Los Llanos/ and 5.3 mi (8.5 km) east of Juana Diaz. DRAINAGE AREA.--12.9 mi 1 (33.4 km 1 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--1959-65 (annual low-flow measurements only), 1965 (annual maximum discharge), 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. Some regulation at low flow by local resident upstream from station. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES January 1966 to DAY OCT NOV DEC JAN FBB MAR APR JUN ADG SEP 1 5.6 e2 . 2 2 2.4 e2 . 3 3 2.4 e2 . 2 4 16 2.4 5 7.0 5.0 6 3.9 3.1 7 3.3 2.4 8 2.9 2.2 9 3.0 2.2 10 2.9 1.9 11 2.5 2.8 12 2.6 2.4 13 2.7 1.6 14 2.2 1.5 15 2.2 2.1 16 4.9 2.4 17 e9.0 2.9 18 e4.5 4.0 19 e3.2 3.6 20 e2.9 5.5 21 e2.8 3.4 22 e2.9 1.6 23 e2.8 1.4 24 e2.9 1.7 25 e2.6 1.4 26 e2.4 1.5 27 e5.5 1.5 28 e6.0 2.1 29 e4.2 2.8 30 e2.8 2.5 31 e2.5 --- TOTAL 123.5 74.6 MEAN 3.98 2.49 MAX 16 5.5 MIN 2.2 1.4 AC-FT 245 148 CFSM .31 .19 IN. .36 .22 2.3 1.9 1.6 1.6 2.5 1.8 1.3 1.2 1.1 1.2 1.6 1.6 3.0 7.7 4.2 1.5 1.4 1.3 25 1.9 1.4 1.3 1.4 1.2 1.1 1.0 .96 .87 .83 .88 .79 77.43 2.50 25 .79 154 .19 .22 STATISTICS OF MONTHLY MEAN DATA MEAN 29.6 16.3 MAX 117 41.0 (WY) 1986 1985 MIN 2.02 2.17 (WY) 1968 1992 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN-DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE ANNUAL RUNOFF (AC-FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 5.60 24.5 1988 .19 1968 FOR .79 .71 .67 .78 .85 .85 .58 .57 .64 .74 .60 .64 .71 .65 .63 .60 .55 .54 .54 .54 .53 .53 .56 .70 .65 .57 .56 .51 .49 .42 .47 19.17 .62 .85 .42 38 .05 .06 FOR WATER 5.29 36.4 1992 .057 1968 .66 .53 .58 .63 .57 .51 .52 e.63 e.39 .44 .40 .48 .51 .72 .77 .68 .59 .60 .65 .83 1.0 .92 .84 .90 .88 .90 .94 37 ___ ___ --- 55.07 1.97 37 .39 109 .15 .16 YEARS 1966 2.11 7.57 1986 .020 1968 18 4.3 .88 .78 .80 .77 .77 .76 .59 .82 .65 .83 1.0 .77 .76 .77 .66 .61 .61 .59 .65 .78 .61 .57 .63 .59 .62 .61 .72 .72 .60 42.82 1.38 18 .57 85 .11 .12 - 1994 1.15 3.49 1986 .012 1968 1993 CALENDAR YEAR 1716. 4. 88 3400 4. 9. 2. 1. 62 70 Sep 20 79 Dec 31 92 Dec 25 36 95 1 8 1 .60 .60 e.68 e.52 e.54 e67 23 3.7 .68 1.9 3.4 .78 .36 .47 .46 .56 .80 .79 .64 .56 .51 .49 .49 .47 .51 .77 1.4 .70 .51 .40 --- 114.29 3.81 67 .36 227 .30 .33 .38 .39 .43 .41 .41 .41 .35 .26 .30 .32 .37 .30 .23 . 19 .19 .19 .59 .15 .12 .12 .05 .03 .02 .00 .00 .00 .00 .00 .00 .00 .00 6.21 .20 .59 .00 12 .02 .02 .00 .00 .01 .02 .00 .00 .00 .00 .02 .04 .05 .06 .06 .07 .08 .08 .18 .15 .12 .10 .09 .08 .07 .06 .04 .16 .08 .13 .09 .08 --- 1.92 .064 .18 .00 3.8 .00 .01 .06 .03 .02 .04 .04 .06 .04 .03 .01 .01 .01 .00 .00 .00 .00 .00 .00 .63 .07 .02 .01 .00 .00 .00 .31 .13 .02 .04 .03 .03 .04 1.68 .054 .63 .00 3.3 .00 .00 .04 .03 .02 .01 .00 .04 .16 .04 .01 .02 .00 .00 .00 33 9.9 1.1 .51 2.4 .50 .38 .27 .19 .13 10 1.0 .14 .12 .09 .08 .08 .07 60.33 1.95 33 .00 120 .15 .17 1.1 3.2 .06 .06 .06 3.2 .06 .05 .05 .05 15 6.6 .06 .05 .06 .06 .06 .06 .09 .49 .26 .14 .21 6.5 .20 .14 .14 .13 .12 .13 --- 38.39 1.28 15 .05 76 .10 .11 , BY WATER YEAR (WY) 3.87 18.8 1985 .000 1968 FOR 1994 615 1 67 686 6 1220 1 3 14.5 62.2 1985 .032 1968 WATER YEAR .41 .69 Apr 6 .00 May 24 .00 May 24 Apr 6 .28 Apr 6 .13 .77 .0 .59 .02 5.00 25.2 1987 .000 1967 2.35 10.5 1991 .000 1967 WATER 8 18 1 2600 30000 24 6450 9 13 1 3.35 9.11 1988 .19 1990 YEARS 1966 .91 .4 .69 Oct .00 Jun . 0 0 Jun Oct .37 Oct .69 .38 .4 .03 12.3 40.2 1985 .063 1967 - 1994 1986 1994 7 1985 22 1966 22 1966 7 1985 7 1985 e Estimated 338 RIO JACAGUAS BASIN 50110900 RIO TOA VACA ABOVE LAGO TOA VACA, PR LOCATION.--Lat 18°07'37", long 66°27'24", Hydrologic Dnit 21010004, on right bank, off a dirt road about 0.3 mi (0.5 km) from road 553, 2.4 mi (3.9 km) southeast from Villalba plaza, and 0.2 mi (0.3 km) downstream from confluence with Quebrada Limon. DRAINAGE AREA.--7.64 mi' (19.79 km'). WATER-DISCHARGE RECORDS PERIOD OP RECORD.--April 1989 to current year. GAGE.--Water stage recorder. Elevation of gage is 525 ft (160 m ), from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. Gage-height and precipitation satellite telemetry at station. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY OCT NOV 1 5.5 9.5 2 3.3 8.3 3 2.7 8.1 4 15 7.6 5 3.6 7.0 6 2.1 7.0 7 1.8 6.5 8 1.8 6.4 9 1.7 6.2 10 1.7 5.9 11 1.5 5.8 12 1.4 5.7 13 1.4 5.4 14 1.4 5.7 15 1.4 5.7 16 6.7 7.2 17 82 6.3 18 15 5.5 19 4.5 6.4 20 3.0 5.1 21 2.6 5.2 22 2.3 .3 23 2.7 .3 24 11 .6 25 4.1 .3 26 2.4 .3 27 48 .5 28 62 .0 29 41 .4 30 20 .3 31 13 TOTAL 366.6 177.5 MEAN 11.8 5.92 MAX 82 9.5 MIN 1.4 4.3 AC-PT 727 352 CPSM .83 .42 IN. .96 .46 STATISTICS OP MONTHLY MEAN MEAN 44.4 17.1 MAX 109 40.1 (WY) 1991 1991 MIN 4.61 2.19 (WY) 1992 1992 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN -DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE INSTANTANEOUS LOW PLOW ANNUAL RUNOPP (AC-PT) ANNUAL RUNOPP (CPSM) ANNUAL RUNOPF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS DEC .5 .3 .2 . 1 .3 .2 .4 .4 .2 .2 . 9 .5 22 14 6.7 4.5 4.2 3.8 3.7 3.7 3.6 3.4 3.5 3.3 3.5 3.7 3.4 3.4 3.4 3.3 3.3 152.6 4.92 22 3.3 303 .35 .40 DATA 7 .03 12.4 1993 1.42 1992 POR JAN 3.1 3.3 2.9 2.9 2.9 3.0 2.9 2.8 2.7 2.9 2.7 3.1 3.1 2.9 3.0 3.0 2.8 3.0 3.0 3.1 3.0 3.4 3.4 3.2 3.5 3.1 2.9 2.9 2.9 2.9 2.9 93.2 3.01 3.5 2.7 185 .21 .24 PEB 2.9 3.1 3.0 3.0 3.1 3.1 3.0 3.2 3.1 3.1 3.3 3.4 3.5 3.5 3.9 3.4 3.6 3.5 3.4 3.4 3.4 3.3 3.4 3.4 3.2 3.4 3.6 14___ ___ --- 103.2 3.69 14 2.9 205 .26 .27 FOR WATER YEARS 1989 12.6 43.1 1992 3.01 1994 3.79 4.75 1991 2.37 1990 MAR 13 7.2 3.1 2.8 2.6 2.8 2.4 2.3 2.3 2.5 2.2 2.1 2.6 2.4 2.3 2.8 2.5 2.5 2.8 2.5 2.5 2.6 2.5 2.6 2.6 2.6 2.8 2.7 2.9 2.9 3.1 95.5 3.08 13 2.1 189 .22 .25 - 1994 3.35 4.71 1991 1.67 1990 1993 CALENDAR YEAR 4634.6 12 .7 197 1.4 1.5 9190 .89 12.14 29 6.8 3.3 Apr 29 Oct 12 Oct 9 APR 3.0 3.2 3.3 3.7 4.1 30 10 3.7 3.2 2.9 2.7 2.8 2.6 2.6 2.6 2.6 2.5 2.6 2.5 2.8 3.0 3.0 3.0 3.0 3.2 7.2 4.8 2.9 2.3 2.0 --- 127.8 4.26 30 2.0 253 .30 .33 MAY 2.0 2.1 2.2 2.2 2.5 2.4 2.5 2.7 2.6 2.7 6.0 3.4 2.4 2.2 2.2 2.3 2.4 2.6 2.6 2.5 2.6 2.6 2.6 2.5 2.5 2.6 2.5 2.5 2.5 2.4 2.3 80.1 2.58 6.0 2.0 159 .18 .21 JUN 2.1 2.3 2.1 2.1 2.1 2.0 2.1 2.0 1.8 1.9 1.8 1.8 1.8 1.6 1.9 1.7 1.4 1.5 1.4 1.3 1.2 1.2 1.2 1.1 1.0 1.1 1.0 .98 .92 .84 --- 47.24 1.57 2.3 .84 94 .11 .12 JUL 1.2 .94 .97 .96 .96 1.0 1.1 1.0 1.0 1. 1 1.1 1.1 1.0 1.0 1. 1 1.1 1.2 1.7 1.6 1.2 1.1 1.1 1.1 1.1 1.2 1.2 1.2 1.2 1.2 1.3 1.3 35.33 1.14 1.7 .94 70 .08 .09 AUG 1.4 1.4 1.3 1.3 1.3 1.3 1.6 1.5 1.5 1.2 1.2 1.0 1.0 1.0 1. 1 1.1 1.1 1.4 25 e3.7 e2.0 e2.0 e2.0 e2.3 2.7 2.6 2.3 17 3.1 2.2 2.1 91.7 2.96 25 1.0 182 .21 .24 SEP e2.6 e2.2 e2.5 e2.5 e2.4 e2.6 e2.5 2.2 2.1 2.1 2.8 2.7 2 . 2 2.4 2.8 2.9 3.0 3.2 3.4 5.7 4.5 3.5 3.3 5.8 4.3 4.5 4.1 4.0 3.8 3.7 --- 96.3 3.21 5.8 2.1 191 .23 .25 , BY WATER YEAR (WY) 9.21 26.3 1993 1.46 1990 FOR 1994 1467. 4. 82 981 6. 2910 3. 5. 2. 1. 14.2 42.2 1992 1.42 1990 WATER YEAR 07 02 Oct 17 84 Jun 30 97 Jun 29 Oct 17 46 Oct 17 72 Jun 30 28 84 8 8 2 10.5 35.4 1992 1.23 1990 7.11 14.4 1992 .71 1990 WATER 13. 18. 4. 676 . 8700 13. 9460 12 . 30 3. 1. 6.99 11.9 1989 2.74 1990 YEARS 1989 - 1 2 02 Jan 5 4 5 Aug 7 61 Jul 9 Jan 5 24 Jan 5 44 Aug 7 92 49 8 2 21.2 46.2 1989 3.21 1994 1994 1991 1994 1992 1990 1990 1992 1992 1990 e Estimated RIO JACAGUAS BASIN 50110900 RIO TOA VACA ABOVE LAGO TOA VACA, PR--Continued 339 WATER-QUALITY RECORDS PERIOD OF RECORD.-- Water years 1988 to 1994. PERIOD OF DAILY RECORD.-- SUSPENDED-SEDIMENT DISCHARGE! April 1988 to September 1994. INSTRUMENTATION.-- Automatic sediment sampler. REMARKS.-- Sediment samples were collected by a local observer on a weekly basis and during high flow events. EXTREMES FOR PERIOD OF DAILY RECORD.-- SEDIMENT CONCENTRATION: Maximum daily mean, 3,170 mg/L January 05, 1992; Minimum daily mean, 1 mg/L several days. SEDIMENT LOADSi Maximum daily mean, 18,300 tons (16,600 tonnes) January 05, 1992; Minimum daily mean, 0.0 ton (0.0 tonne) several days. EXTREMES FOR CURRENT YEAR 1994.-- SEDIMENT CONCENTRATION! Maximum daily mean, 559 mg/L Oct. 17, 1993; Minimum daily mean, 1 mg/L several days. SEDIMENT LOADS! Maximum daily mean, 503 tons (456 tonnes) Oct. 17, 1993; Minimum daily mean, 0.0 ton (0.0 tonne) few days. SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) OCTOBER MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (M6/L) (TONS/DAY) NOVEMBER MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) DECEMBER 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 5.5 3.3 2.7 15 3.6 2.1 1.8 1.8 1.7 1.7 1.5 1.4 1.4 1.4 1.4 6.7 82 15 4.5 3.0 2.6 2.3 2.7 11 4.1 2.4 48 62 41 20 13 17 17 28 96 47 32 26 26 36 65 76 79 80 80 80 98 559 81 35 30 35 43 48 80 45 40 475 389 163 44 39 .28 .13 .18 12 .57 .18 .12 .11 .16 .34 .29 .29 .28 .27 .26 3.7 503 4.3 .45 .24 .21 .25 .32 5.2 .53 .26 252 218 25 2.4 1.3 9.5 8.3 8.1 7.6 7.0 7.0 6.5 6.4 6.2 5.9 5.8 5.7 5.4 5.7 5.7 7.2 6.3 5.5 6.4 5.1 5.2 .3 .3 .6 .3 .3 .5 .0 .4 .3 36 31 29 37 62 83 98 72 26 55 114 138 138 132 90 33 44 104 138 140 94 19 5 15 55 93 65 27 30 53 .88 .68 .60 .68 1.2 1.5 1.6 1.2 .40 .79 1.6 2.0 1.9 1.8 1.3 .48 .62 1.5 2.7 1.9 1.2 .23 .06 .18 .64 1.1 .75 .54 .35 .57 .5 .3 .2 .1 .3 .2 .4 .4 .2 .2 .9 .5 2 4 6.7 4.5 4.2 3.8 3.7 3.7 3.6 3.4 3.5 3.3 3.5 3.7 3.4 3.4 3.4 3.3 3.3 67 74 73 60 33 13 36 77 97 105 82 46 149 68 30 29 50 64 72 73 53 24 24 38 29 14 8 10 14 14 16 .72 .80 .79 .65 .35 .13 .38 .83 1.0 1.2 .96 .57 39 6.6 .72 .34 .55 .66 .68 .66 .48 .22 .21 .33 .25 .12 .08 .10 .13 .12 .13 TOTAL 366.6 1032.62 177.5 30.95 152.6 59.76 340 DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 RIO JACAGUAS BASIN 50110900 RIO TOA VACA ABOVE LAOO TOA VACA, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CPS) (MG/L) (TONS/DAY) JANUARY 3.1 3.3 2.9 2.9 2.9 3.0 2.9 2.8 2.7 2.9 2.7 3.1 3.1 2.9 3.0 3.0 2.8 3.0 3.0 3.1 3.0 3.4 3.4 3.2 3.5 3.1 2.9 2.9 2.9 2.9 2.9 25 48 99 135 139 109 64 49 47 44 36 26 16 7 10 43 90 74 28 14 7 6 8 8 29 66 59 23 10 13 32 .20 .38 .74 .98 1.0 .79 .45 .33 .33 .31 .26 .21 .13 .05 .07 .32 .66 .55 .23 .12 .06 .05 .06 .06 .23 .52 .45 .17 .08 .09 .23 MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) FEBRUARY 2.9 3.1 3.0 3.0 3.1 3.1 3.0 3.2 3.1 3.1 3.3 3.4 3.5 3.5 3.9 3.4 3.6 3.5 3.4 3.4 3.4 3.3 3.4 3.4 3.2 3.4 3.6 14 35 16 27 46 35 15 7 8 10 10 8 9 10 7 4 3 3 3 3 3 3 4 6 10 14 14 11 62 .25 .11 .20 .36 .28 .12 .06 .06 .08 .08 .07 .07 .09 .08 .05 .03 .02 .02 .02 .02 .02 .03 .06 .09 .11 .12 .11 7.4 MARCH 13 7.2 3.1 2.8 2.6 2.8 2.4 2.3 2.3 2.5 2.2 2.1 2.6 2.4 2.3 2.8 2.5 2.5 2.8 2.5 2.5 2.6 2.5 2.6 2.6 2.6 2.8 2.7 2.9 2.9 3.1 56 20 5 5 6 8 10 15 20 24 28 28 23 20 23 27 25 20 15 11 7 5 4 3 3 3 4 4 4 3 3 3.8 .63 .04 .04 .05 .06 .07 .09 .13 .15 .15 .16 .14 .12 .14 .17 .16 .13 .10 .07 .05 .04 .03 .02 .02 .02 .02 .03 .03 .02 .02 TOTAL 93.2 10.11 103.2 95.5 6.70 RIO JACAGDAS BASIN 34 1 50110900 RIO TOA VACA ABOVE LAOO TOA VACA, PR—Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) APRIL MAY 1 3.0 2 .02 2.0 1 <.01 2 3 4 5 6 7 9 9 10 11 12 13 14 15 16 17 19 19 20 21 22 23 24 25 26 27 29 29 30 31 3.2 3.3 3.7 4.1 30 10 3.7 3.2 2.9 2.7 2.9 2.6 2.6 2.6 2.6 2.5 2.6 2.5 2.9 3.0 3.0 3.0 3.0 3.2 7.2 4.9 2.9 2.3 2.0 ___ 2 2 4 194 199 45 15 15 15 14 11 10 9 6 5 5 5 4 3 3 4 5 5 3 25 15 3 2 1 ___ .02 .02 .04 66 69 2.0 .14 .10 .10 .10 .09 .06 .05 .04 .04 .04 .04 .03 .02 .02 .03 .04 .04 .03 1.0 .27 .03 .02 .01 ___ 2.1 2.2 2.2 2.5 2.4 2.5 2.7 2.6 2.7 6.0 3.4 2.4 2.2 2.2 2.3 2.4 2.6 2.6 2.5 2.6 2.6 2.6 2.5 2.5 2.6 2.5 2.5 2.5 2.4 2.3 1 3 4 3 2 2 4 4 4 20 12 5 3 3 3 3 6 10 17 11 7 7 5 5 7 10 9 5 2 1 <.01 .02 .02 .02 .02 .02 .02 .02 .02 .91 .13 .03 .02 .02 .02 .02 .04 .06 .11 .07 .05 .05 .04 .04 .05 .06 .05 .03 .02 .01 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) JUNE 2.1 1 <.01 2.3 2.1 2.1 2.1 2.0 2.1 2.0 1.9 1.9 1.9 1.9 1.9 1.6 1.9 1.7 1.4 1.5 1.4 1.3 1.2 1.2 1.2 1.1 1.0 1.1 1.0 .99 .92 .94 ___ 2 3 2 2 2 3 6 9 11 11 10 9 6 3 2 3 5 5 5 3 2 2 1 2 2 2 2 2 2 _._ .01 .02 .02 .02 .02 .02 .03 .04 .05 .06 .05 .04 .03 .01 <.01 .01 .02 .02 .02 .01 .01 .01 .01 .01 .01 .01 .01 .01 .01 ___ TOTAL 127.9 139.43 90.1 1.99 47.24 0.50 342 RIO JACAGDAS BASIN 50110900 RIO TOA VACA ABOVE LAGO TOA VACA, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE (CPS) (MG/L) (TONS/DAY) (CPS) (MG/L) (TONS/DAY) (CPS) (MG/L) (TONS/DAY) 1.2 .94 .97 .96 .96 1.0 1.1 1.0 1.0 1.1 1.1 1.1 1.0 1.0 1.1 1.1 1.2 1.7 1.6 1.2 1.1 1.1 1.1 1.1 1.2 1.2 1.2 1.2 1.2 1.3 1.3 JULY 2 4 7 9 10 10 10 7 4 3 3 3 4 4 4 3 3 2 2 3 2 2 2 2 4 6 9 9 6 4 5 TOTAL 35.33 --- YEAR e 1467.07 Estimated AUGUST .00 .01 .02 .02 .02 .02 .02 .02 .01 .00 .01 .02 .02 .02 .02 .01 .01 .01 .01 .00 .00 .00 .00 .00 .01 .02 .03 .03 .02 .02 .02 0.42 1420.84 1.4 1.4 1.3 1.3 1.3 1.3 1.6 1.5 1.5 1.2 1.2 1.0 1.0 1.0 1.1 1.1 1.1 1.4 25 «3.7 •2.0 •2.0 •2.0 •2.3 2.7 2.6 2.3 17 3.1 2.2 2.1 91.7 7 8 9 12 14 13 11 8 7 9 10 11 11 11 11 12 12 11 198 21 10 9 10 10 8 4 3 99 7 2 2 —— .02 .02 .03 .04 .04 .04 .04 .03 .03 .03 .03 .03 .03 .02 .03 .04 .03 .03 98 a. 26 a. 05 a. 04 a. 05 a. 07 .06 .03 .02 25 .07 .01 .01 124.23 SEPTEMBER a2.6 a2.2 a2.5 a2.5 •2.4 a2.6 a2.5 2.2 2.1 2.1 2.8 2.7 2.2 2.4 2.8 2.9 3.0 3.2 3.4 5.7 4.5 3.5 3.3 5.8 4.3 4.5 4.1 4.0 3.8 3.7 96.3 2 2 2 2 2 2 3 3 4 6 7 7 9 10 7 3 2 2 2 3 5 4 4 17 22 33 45 55 65 74 —— .02 .02 .02 .02 .02 .02 .02 .02 .02 .03 .05 .05 .05 .06 .05 .03 .02 .02 .02 .05 .07 .04 .03 .31 .28 .38 .50 .59 .67 .74 4.22 RIO JACAGUAS BASIN 50110900 RIO TOA VACA ABOVE LAGO TOA VACA, PR—Continued WATER QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT 343 DATE OCT 1993 27... 27.. . AUG 1994 05... TIME 1510 1540 1420 DIS- CHARGE, INST. CUBIC FEET PER SECOND 240 146 330 SEDI- MENT, SUS- PENDED (MG/L) 8570 3300 3880 SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) 5550 1300 3460 SED. SUSP. FALL DIAM. PERCENT FINER THAN .002 MM 23 39 36 SED. SUSP. FALL DIAM. PERCENT FINER THAN .004 MM 23 45 45 SED. SUSP. FALL DIAM. PERCENT FINER THAN .008 MM 31 54 56 DATE OCT 1993 27.. . 27... AUG 1994 05... SED. SUSP. FALL DIAM. PERCENT FINER THAN 016 MM 39 66 SED. SUSP. FALL DIAM. PERCENT FINER THAN .031 MM 49 77 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .062 MM 58 90 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .125 MM 74 97 SED. SUSP. JSIEVE DIAM. PERCENT FINER THAN .250 MM 91 99 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .500 MM 98 99.8 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN 1.00 MM 99.7 100 68 76 82 88 92 96 99 344 RIO JACAGUAS BASIN 50110900 RIO TOA VACA ABOVE LAOO TOA VACA, PR—Continued WATER QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 SILT AND CLAY PERCENT OF SUSPENDED SEDIMENT OCT 17 27 27 AUO 19 SEP 26 30 DATE 1993 . . . 1994 . . . TIME 1700 1435 1600 1415 1542 1525 STREAM- FLOW, INSTAN- TANEOUS (CFS) 157 576 166 365 4.6 3.7 SEDI- MENT, SUS- PENDED (MO/L) 1720 477 2400 4270 969 78 SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) 729 742 1080 4200 12 0.78 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .062 MM 70 30 91 55 99 97 RIO JACAGUAS BASIN 50111500 RIO JACAGUAS AT JUANA DIAZ, PR 345 LOCATION.--Lat 18°03'16", long 66°30'40", Hydrologic Unit 21010004, on Highway 14 bridge, 0.4 ml (0.6 km) west of Juana Diaz plaza, and 4.0 mi (6.4 km) downstream from Lago Guayabal. DRAINAGE AREA.--49.8 mi 1 (129.0 km 1 ). HATER-DISCHARGE RECORDS PERIOD OF RECORD.--March 1984 to current year. GAGE.--Hater-stage recorder and crest-stage gage. Elevation of gage is 131 ft (40 m), from topographic map. REMARKS.--Records poor. Plow regulation from Lago Guayabal. Gage-height and precipitation satellite telemetry at station. DISCHARGE, CUBIC FEET PER SECOND, HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY OCT NOV DEC JAN PBB MAR APR MAY JUN JUL AUG SEP 1 42 17 2 30 17 3 28 19 4 46 19 5 48 19 6 34 19 7 35 20 8 17 19 9 13 15 10 11 14 11 11 14 12 10 13 13 11 13 14 11 13 15 12 12 16 15 12 17 315 13 18 78 12 19 33 12 20 28 12 21 27 12 22 29 11 23 30 11 24 31 11 25 28 12 26 21 12 27 21 11 28 21 11 29 19 11 30 18 11 31 17 TOTAL 1090 417 MEAN 35.2 13.9 MAX 315 20 MIN 10 11 AC-FT 2160 827 CPSM .71 .28 IN. .81 .31 11 11 10 11 11 10 9.6 9.4 9.1 8.9 8.9 8.9 9.0 27 9.3 8.2 8.1 8.3 11 e8.5 e7.5 e7.3 e7.3 e7.2 e7.0 e6.8 e6.7 e6.4 e6.2 e6.0 e6.0 282.6 9.12 27 6.0 561 .18 .21 STATISTICS OP MONTHLY MEAN DATA MEAN 141 104 MAX 445 287 (WY) 1986 1988 MIN 8.65 10.5 (WY) 1987 1987 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN- DAY MINIMUM INSTANTANEOUS PEAK PLOW INSTANTANEOUS PEAK STAGE ANNUAL RUNOFF (AC- FT) ANNUAL RUNOFF (CPSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 41.0 151 1988 9.12 1994 FOR e6.0 e5.8 eS.6 e5.6 e5.4 e5.3 eS.l e4.9 e4.8 e4.6 e4.3 e4.3 e4.3 e4.1 e4.0 e3.9 e3.7 e3.7 e3.6 e3.5 e3.4 e3.3 e3.3 e3.3 e3.2 e3.1 e3.0 e2.9 e2.9 e2.7 e2.5 126.1 4.07 6.0 2.5 250 .08 .09 FOR WATER 28.4 144 1992 4.07 1994 e2.5 e2.4 e2.3 e2.3 e2.2 e2.1 e2.0 e2.0 el. 9 el. 9 el. 9 el. 9 el. 9 el. 9 el. 9 el. 9 el. 9 el. 9 el. 9 el. 9 el. 9 el. 9 el. 9 el. 8 el. 8 el. 8 el. 8 el. 8 ___ ___ --- 55.3 1.97 2.5 1. 8 110 .04 .04 YEARS 1984 8.53 16.9 1991 1.97 1994 e3.5 e3.1 e2.6 e2.3 e2.3 e2.2 e2.0 el. 9 el. 9 e2.2 e2.1 e2.2 e2.3 e2.2 e2.1 e2.1 e2.0 el. 8 el. 7 el. 5 el. 4 el. 4 el. 4 el. 5 el. 5 el. 5 el. 5 el. 5 el. 6 el. 6 el. 6 60.5 1.95 3.5 1.4 120 .04 .05 - 1994 4.76 7.94 1988 1.95 1994 1993 CALENDAR YEAR 11988. 32. 589 2. 2. 23780 8. 72 15 4. 8 8 May 27 2 Mar 28 3 Mar 28 66 96 7 el. 7 el. 7 el. 7 el. 7 el. 7 el. 9 e2.9 e3.1 el. 9 el. 7 el. 6 el. 7 el. 5 el. 5 el. 5 el. 5 el. 4 el. 5 el. 4 el. 6 el. 7 el. 7 el. 7 el. 7 el. 9 e4.3 e2.9 el. 6 el. 3 el.l --- 55.1 1.84 4.3 1.1 109 .04 .04 , BY WATER 10.2 34.7 1992 1.84 1994 FOR 1994 2273. 6. 315 . . 5890 14. 4510 . 1. 13 1. . el.l el. 2 el. 3 el. 4 el. 4 el. 3 el. 4 el. 5 el. 4 el. 5 e3.6 e2.0 el. 3 el. 2 el. 2 el. 3 el. 3 el. 5 el. 5 el. 4 el. 5 el. 5 el. 5 el. el. el. el. el. el. el. 3 el. 3 45.4 1.46 3.6 1.1 90 .03 .03 YEAR (WY) 75.9 215 1985 1.46 1994 el. 2 el. 3 el. 2 el. 2 el. 4 el.l el. 2 el.l el.O el.l el.O el.O el.O e.80 el.l e.98 e.94 e.96 e.90 e.82 e.76 e.76 e.76 e.68 e.62 e.68 e.62 e.62 e.58 e.52 --- 27.90 .93 1.4 .52 55 .02 .02 44.2 198 1987 .93 1994 WATER YEAR 44 23 52 61 32 13 70 8 81 Oct 17 Jun 30 Jun 29 Oct 17 Oct 17 e.78 e.58 e.62 e.60 e.60 e.62 e.70 e.64 e.64 e.70 e.70 e.64 e.64 e.64 e.67 2.4 1.6 1.6 1.5 1.3 1.2 1.2 1.2 1.2 2.0 1.8 1.4 1.2 .95 .94 .92 32.18 1.04 2.4 .58 64 .02 .02 24.0 82.4 1987 1.04 1994 WATER 46 80 6 4530 40000 29 33410 12 103 8 2 1.1 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.1 1.2 1.1 .87 .75 7.7 4.4 2.3 1.8 1.7 1.7 1.6 1.5 1.4 1.2 1.0 1.7 1.2 1.0 1.1 1.2 1.2 1.1 49.32 1.59 7.7 .75 98 .03 .04 19.1 41.1 1985 1.59 1994 YEARS 1984 .1 .9 .23 Nov .24 Jan .61 Jun Oct .42 Oct .93 .58 .1 .5 1.1 1.6 1.4 1.1 .86 .92 .98 .84 .68 .65 .75 .88 .86 .76 .65 .63 .63 .59 .64 1.4 1.1 .92 1.6 2.0 1.6 1.5 1.2 1.3 1.5 1.4 --- 32.04 1.07 2.0 .59 64 .02 .02 35.6 164 1985 1.07 1994 - 1994 1986 1994 27 1987 3 1992 29 1994 7 1985 7 1985 e Estimated 346 THIS PAGE WAS LEFT BLANK INTENTIONALLY -) ...y" SE/i EXPLANATION A1125 SURFACE-WATER STATION AND NUMBER yn62 QUALITY-OF-WATER STATION AND NUMBER • 132 WELL AND WELL NUMBER • 125780 LAKE-ELEVATION STATION 01234 MILES Figure 24.--South coast river basins the Rio Inabon to Rio Loco basins. Co •b N 348 RIO INABON BASIN 50112500 RIO INABON AT REAL ABAJO, PR LOCATION.--Lat 18°05'10", long 66°33'46", Hydrologic Unit 21010004, at bridge on private road, off Highway 511 at Hacienda La Concordia, 0.4 mi (0.6 km) upstream from diversion canal, 0.5 mi (0.8 km) north of Real Abajo, and 6.1 mi (9.8 km) northeast of Plaza Degetau in Ponce. DRAINAGE AREA.--9.70 mi> (25.12 km9 ). 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. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY OCT NOV DEC JAN FEB MAR MAY JUN AUG SEP 1 20 12 2 11 13 3 13 17 4 26 13 5 17 11 6 8.3 9.5 7 31 11 8 18 10 9 7.7 11 10 8.2 10 11 e8.0 9.9 12 e7 . 0 10 13 e7.2 9.5 14 elO 10 15 e20 10 16 e33 14 17 e28 8.3 18 e20 8.6 19 e!5 10 20 elO 8.5 21 e9.0 9.9 22 e9.8 7.6 23 e!2 7.4 24 e!3 7.3 25 ell 7.1 26 e!3 6.7 27 13 6.9 28 16 19 29 13 8.1 30 11 6.5 31 11 —— TOTAL 450.2 302.8 MEAN 14 . 5 10 . 1 MAX 33 19 MIN 7.0 6.5 AC-FT 893 601 CFSM 1.50 1.04 IN. 1.73 1.16 STATISTICS OF MONTHLY MEAN MEAN 47.4 34.6 MAX 148 77.9 (WY) 1986 1978 MIN 14.5 8.32 (WY) 1994 1977 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN-DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE ANNUAL RUNOFF (AC-FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 5.6 5.5 5.8 5.9 6.5 5.7 5.4 5.6 5.7 5.8 6.5 6.8 15 31 18 9.7 7.7 6.7 9.2 30 19 12 8.1 6.9 5.8 5.8 5.7 5.6 5.6 5.6 5.8 284.0 9.16 31 5.4 563 .94 1.09 DATA 12.7 26.5 1966 4.43 1977 FOR 5.8 5.7 5.2 5.2 5.2 5.2 4.9 4.9 4.9 5.3 5.6 5.6 5.5 6.2 5.8 5.8 5.2 5.8 6.2 5.5 6.6 e!2 e30 e20 elO e6.1 5.5 5.3 5.7 6.3 6.8 223.8 7.22 30 4.9 444 .74 .86 FOR WATER 8.70 45.5 1992 4.11 1989 7.0 6.9 6.1 6.2 6.1 6.3 e5.4 e5.4 e5.3 e5.2 e5.1 e5.2 e5.2 e5.4 e5.3 e5.2 e5.2 e5.0 e5.0 e5.2 e5.0 e5.0 e5.2 e5.0 e4.5 4.5 5.1 e40 ___ —— 186.0 6.64 40 4.5 369 .68 .71 YEARS 1964 5.40 9.25 1992 3.05 1977 e!5 e8.0 e5.2 e4.8 e4.5 e4.3 e4.2 e4.1 e3.9 e3.7 3.8 3.2 5.1 3.8 4.0 4.8 3.4 3.0 3.1 3.2 3.2 3.1 2.9 2.6 2.5 2.5 2.9 e2.3 3.0 3.4 3.8 127.3 4.11 15 2.3 252 .42 .49 - 1994 5.64 16.4 1972 1.85 1977 1993 CALENDAR YEAR 5176. 14. 222 2. 3. 10270 1. 19. 25 9. 5. 2 2 May 27 5 Apr 2 6 Mar 18 46 85 5 4 16 9.6 5.7 4.9 5.3 6.3 9.7 9.4 6.1 6.5 8.6 6.9 6.0 5.8 5.1 .4 .3 .3 .4 .2 3.5 3.2 3.1 2.7 2.5 4.1 3.5 4.6 2.8 2.6 —— 166.1 5.54 16 2.5 329 .57 .64 2.7 2.8 2.7 2.5 2.6 10 5.5 3.3 2.9 9.6 11 7.9 4.0 10 13 7.1 10 7.0 4.9 4.2 e4.0 e4.0 e4.2 e4.2 e4.3 4.5 4.6 5.1 6.0 5.5 6.5 176.6 5.70 13 2.5 350 .59 .68 6.2 e60 e24 e9.0 e5.8 e4.2 e3.9 e4.2 5.5 5.5 4.9 4.3 4.1 2.8 6.0 5.4 3.3 2.7 2.4 2.1 1.9 1.8 1.8 1.6 1.6 2.2 2.4 2.7 2.3 2.0 186.6 6.22 60 1.6 370 .64 .72 2.1 2.1 2.6 2.5 2.4 2.3 2.6 2.4 2.3 2.0 1.9 2.1 2.0 1.8 2.6 2.3 2.1 3.3 4.0 2.7 2.5 2.1 1.8 1.2 3.2 3.3 1.9 1.9 1.3 1.9 2.3 71.5 2.31 4.0 1.2 142 .24 .27 3.0 3.0 1.9 1.6 2.5 2.7 4.0 18 15 6.7 3.8 2.8 2.2 11 5.2 2.7 2.1 2.0 5.5 6.7 4.8 3.4 4.2 4.9 11 5.3 3.9 43 20 10 8.0 220.9 7.13 43 1.6 438 .73 .85 7.5 8.9 9.4 6.9 5.4 4.7 4.6 4.2 4.0 3.6 5.1 5.3 3.9 3.6 3.7 3.6 4.7 12 12 19 20 15 24 45 25 14 10 8.5 8.7 17 319.3 10.6 45 3.6 633 1.10 1.22 , BY WATER YEAR (WY) 8.08 19.2 1992 2.76 1975 FOR 1994 2715. 7. 60 1. 1. 794 9. 5390 . 10. 14 5. 2. 20.0 76.7 1969 1.94 1967 WATER YEAR 1 44 Jun 2 2 Jul 24 9 Jun 20 Jun 2 13 Jun 2 77 41 4 4 16.2 49.8 1969 2.75 1967 12.0 32.7 1979 1.77 1990 WATER 18. 30. 7. 2500 1. 19000 25. 13190 1. 25. 40 9. 3. 17.1 46.1 1979 4.47 1974 YEARS 1964 2 9 44 Sep 80 Jul 1 Mar Oct 30 Oct 88 50 0 1 32.2 119 1975 7.70 1986 - 1994 1969 1994 16 1975 23 1977 31 1977 7 1985 7 1985 e Estimated RIO BOCANA BASIN 349 50113800 RIO CERRILLOS ABOVE LAGO CBRRILLOS NEAR PONCE, PR LOCATION.--Lat 18°07'01", long 66°36'17", Hydrologic Unit 21010004, on right bank, 0.3 mi (0.5 km) downstream from confluence with Rio San Patricio, 0.1 mi (0.2 km) southwest of Hwy 139 and 2.4 mi (3.7 km) northwest of Maraguez. DRAINAGE AREA.-- 15.4 mi 9 (39.9 km 9 ). WATER-DISCHARGE RECORDS PERIOD OP RECORD.--December 1988 to current year. GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 720 ft (210 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. Gage-height and precipitation satellite telemetry at station. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 45 13 2 44 14 3 38 13 4 60 12 5 47 12 6 31 12 7 93 11 8 59 11 9 32 10 10 25 10 11 22 9.6 12 22 9.6 13 20 9.6 14 18 9.6 15 17 9.3 16 42 9.9 17 31 9.5 18 28 8.9 19 22 8.6 20 19 8.8 21 17 9.0 22 16 8.2 23 17 8.2 24 17 8.1 25 16 7.8 26 15 7.8 27 15 8.2 28 22 8.3 29 16 8.3 30 14 7.8 31 14 --- TOTAL 894 293.1 MEAN 28.8 9.77 MAX 93 14 MIN 14 7.8 AC-FT 1770 581 CFSM 2.42 .82 IN. 2.79 .92 STATISTICS OF MONTHLY MEAN MEAN 82.3 34.7 MAX 154 59.3 (WY) 1991 1993 MIN 24.6 9.77 (WY) 1992 1994 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN-DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE ANNUAL RUNOFF (AC- FT) ANNUAL RUNOFF (CPSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 7.8 7.8 7.8 7.8 8.0 8.2 7.8 7.8 7.8 7.8 7.8 7.8 9.2 14 11 8.7 8.6 8.2 8.2 8.4 8.2 8.6 8.6 8.2 8.2 8.1 7.8 7.8 7.8 7.8 7.4 259.0 8.35 14 7.4 514 .70 .81 DATA 16.7 26.2 1993 8.35 1994 FOR 7.3 7.3 7.3 7.1 6.9 6.9 6.9 6.9 6.6 6.6 6.7 6.9 6.7 6.6 6.6 6.6 6.6 6.6 6.6 6.2 7.6 7.3 37 11 7.9 6.6 6.2 6.0 5.9 5.6 5.5 242.5 7.82 37 5.5 481 .66 .76 5.3 5.2 5.2 5.2 5.1 4.9 4.9 4.9 4.8 4.6 4.6 4.4 4.4 4.6 4.9 4.6 4.6 4.6 e4.6 e4.6 e4.6 e4.6 e4.6 4.9 4.6 4.6 4.6 51 ___ ___ --- 179.5 6.41 51 4.4 356 .54 .56 FOR WATER YEARS 1989 19.3 59.0 1992 7.46 1989 9.11 13.2 1992 6.34 1990 14 9.9 6.5 5.9 5.5 5.3 5.2 5.0 4.9 5.1 5.0 6.0 7.1 5.5 5.6 6.6 5.5 5.2 5.2 5.2 5.2 5.2 5.3 5.5 5.5 5.5 5.5 5.5 5.5 5.5 5.2 183.6 5.92 14 4.9 364 .50 .57 - 1994 11.1 27.5 1989 4.77 1990 1993 CALENDAR YEAR 8383.1 23.0 270 7.1 7.5 16630 1.93 26.21 43 15 8.2 May 27 Apr 6 Apr 1 5.6 6.3 5.9 6.1 5.6 5.5 11 7.8 5.9 7.1 7.1 7.1 5.8 5.5 5.5 5.5 5.2 5.6 5.5 5.6 5.9 6.1 5.5 5.5 5.5 5.2 15 9.5 6.1 5.4 --- 194.9 6.50 15 5.2 387 .55 .61 .9 .8 .4 .2 .9 .9 .9 .2 .1 37 14 8.8 5.9 19 9.4 6.0 11 6.8 7.4 5.5 5.2 .7 .4 .3 .1 .1 .1 .1 .3 .1 3.9 218.4 7.05 37 3.9 433 .59 .68 3.9 53 16 8.4 6.2 5.6 5.2 5.2 .9 .9 .7 .6 .6 .4 8.7 6.8 5.4 4.9 4.6 4.4 3.9 3.9 3.9 3.8 3.6 3.6 3.6 3.5 3.4 3.5 --- 203.1 6.77 53 3.4 403 .57 .63 3.8 3.4 3.4 3.4 3.4 3.0 3.1 3.4 3.5 3.4 3.4 3.4 3.0 3.1 3.6 3.7 3.7 3.7 3.9 3.3 3.3 3.2 3.1 3.0 4.2 3.5 3.0 3.0 3.2 3.2 3.2 104.5 3.37 4.2 3.0 207 .28 .33 3.3 3.4 3.4 3.6 4.0 4.9 3.7 16 7.2 4.1 3.6 3.4 3.4 3.9 4.0 3.4 3.4 3.8 41 9.3 4.7 4.1 3.7 4.2 7.1 4.3 3.9 134 32 11 7.0 348.8 11.3 134 3.3 692 .95 1.09 5.7 5.4 5.1 4.3 4.0 3.8 3.8 3.6 3.4 3.2 4.7 7.5 5.5 3.7 3.4 3.2 16 8.3 5.0 52 52 27 49 102 37 18 13 11 9.7 36 --- 506.3 16.9 102 3.2 1000 1.42 1.58 , BY WATER YEAR (WY) 15.0 24.3 1989 6.38 1990 FOR 1994 3627. 9. 134 3. 3. 1530 5. 7200 11. 17 5. 3. 26.5 68.2 1993 4.58 1990 WATER YEAR 7 94 Aug 28 0 Jul 6 2 Jul 27 Aug 28 02 Aug 28 84 34 8 5 21.6 36.5 1989 6.37 1990 13.9 26.7 1991 3.37 1994 WATER 26. 35, 9. 717 3. 3. 8140 9. 18860 2. 29, 19 14 4. 25.2 53.1 1991 11.3 1994 YEARS 1989 - 0 7 94 Jan 6 0 Jul 6 2 Jul 27 Jan 5 65 Jan 5 19 72 7 46.4 88.0 1989 16,9 1994 1994 1993 1994 1992 1994 1994 1992 1992 e Estimated 350 RIO BUCANA BASIN 50113950 LAGO CBRRILLOS AT DAMSITB, PR LOCATION.--Lat 18<>04'41", long 66<>34'38" / Hydrologic Dnit 21010004, on left bank west from intake house of dam, 0.7 mi (1.1 km) southwest from Iglesia San Mateo at Real Abajo, 3.2 mi (5.1 km) northeast from Hospital de Distrito de Ponce, and 2.2 mi (3.5 km) northwest from Bscuela Yuca. DRAINAGE AREA.--17.4 mi' (45.1 km'). ELEVATION RECORDS PERIOD OF RECORD.--October 1992 to current year . GAGE.—Hater-stage recorder. Datum of gage is mean sea level. REMARKS.--Lake is formed by Cerrillos Dam, a rockfilled ungated structure completed in 1992. Elevation of crest is 611 ft (186 m) above mean sea level, with a structural height of 323 ft (98 m) and a lenght of 1,555 ft (474 m) . The dam has a capacity of approximately 47,900 ac-ft (59.1 hm3 ) . The dam is operated by U.S. Army Corps of Engineers and its purpose is for flood control, water supply, power generation, and recreation. Gage-height and precipitation satellite telemetry at station. EXTREMES OBSERVED FOR PERIOD OF RECORD.--Maximum elevation, 536.23 ft (163.44 m), Sept. 30, 1994; Minimum elevation, 416.53 ft (126.96 m), Oct. 1, 1992, (Revised). EXTREMES OBSERVED FOR HATER YEAR 1993 (Revised).--Maximum elevation, 522.86 ft (159.37 m) , Sept. 30; minimum elevation, 416.53 ft (126.96 m), Oct. 1. EXTREMES OBSERVED FOR CURRENT YEAR.--Maximum elevation, 536.23 ft (163.44 m), Sept. 30; minimum elevation, 521.87 ft (159.06 m), Oct. 6. Capacity Table Elevation , in feet 328 426 492 (based on data from U.S. Army Corps of Engineers) Contents in acre-feet Elevation, in feet 0 3,206 10,621 525 558 Contents in acre-feet 16,990 25,786 ELEVATION (FEET NGVD), HATER YEAR OCTOBER 1992 TO SEPTEMBER 1993 DAILY OBSERVATION AT 24:00 VALUES DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 OCT 418.70 420.65 421.62 423.07 424.39 427.42 432.24 436.05 438.88 441.35 444.09 445.99 447.58 449.48 451.03 451.79 453.42 453.91 454.63 455.74 456.65 457.53 465.92 466.43 466.49 NOV 478.01 478.58 479.07 478.93 478.91 482.56 483.06 483.49 483.93 DEC 494.73 494.82 494.73 494.83 495.13 495.45 495.60 495.29 494.73 484.32 494.52 484.71 485.52 486.25 486.79 487.38 488.90 490.43 491.26 491.75 494.01 493.89 494.02 493.92 494.22 494.10 494.76 495.00 495.21 495.46 495.71 495.84 495.90 496.03 496.15 496.10 496.23 496.36 496.52 496.67 496.77 JAN 498.24 498.36 498.53 498.66 498.78 498.89 499.02 499.10 499.23 499.32 499.42 499.52 499.62 499.69 499.80 499.88 499.99 500.05 500.13 500.23 500.30 500.37 500.46 500.53 500.60 FEB 503.81 503.99 504.13 504.12 504.23 504.30 504.40 504.47 504.54 504.61 504.66 504.75 504.83 504.90 504.95 505.13 505.22 505.27 505.43 505.49 505.55 505.60 505.66 505.70 505.73 MAR 505.93 505.97 506.01 506.03 506.07 506.81 506.14 506.30 506.36 506.40 506.44 506.46 506.50 506.54 506.67 506.69 506.72 506.73 506.75 506.75 506.77 506.79 506.79 506.88 506.94 APR 507.16 507.17 507.29 507.32 507.34 507.35 507.36 507.41 507.50 507.53 507.75 507.95 508.61 508.89 509.15 509.35 509.44 509.55 509.63 509.77 509.83 509.90 509.95 510.11 510.19 MAY 516.61 518.88 519.78 519.44 519.67 519.75 519.49 518.89 520.00 519.02 519.03 519.20 519.36 518.85 519.67 519.95 520.18 519.89 519.55 519.06 520.72 519.18 519.23 519.65 519.34 JUN 519.17 519.15 519.53 519.80 518.81 519.04 519.22 519.21 518.83 519.04 519.23 519.42 519.61 519.36 519.09 519.30 519.42 520.17 519.83 519.09 519.33 519.55 519.68 519.67 519.69 JUL 519.67 519.77 518.97 518.95 519.08 519.19 519.37 519.53 519.62 518.67 518.88 519.17 519.37 519.59 519.39 519.27 519.37 A A A 520.10 519.58 518.96 519.13 519.20 AUG 518.73 518.72 518.80 518.83 518.85 518.89 518.98 519.00 519.02 519.14 519.16 519.21 519.26 519.30 516.68 517.46 517.60 517.65 517 .7 6 517.82 517.95 518.20 517.05 516.35 516.34 SEP 517.04 517.15 517.39 517.60 517.70 517.79 517.85 517.88 517.99 518.92 519.23 519.34 519.47 519.51 519.62 519.65 519.76 520.01 520.12 520.44 520.61 520.73 520.94 521.14 521.25 26 27 28 29 30 31 468.87 470.40 471.55 474.25 475.79 476.97 494.29 494.62 494.40 494.41 494.60 --- 496.99 497.17 497.32 497.72 497.91 498.11 500.66 500.77 501.46 503.08 503.45 503.63 506.46 506.52 506.60 ___ ___ ___ 506.97 507.00 507.04 507.08 507.09 507.15 510.23 510.30 510.58 513.03 514.71 ___ 520.02 520.81 519.94 519.18 519.25 519.30 519.78 518.87 519.18 519.37 519.57 ___ 519.34 519.43 519.54 519.59 519.65 519.70 516.37 516.59 516.76 516.83 516.82 516.94 521.54 521.73 522.29 522.33 522.71 ___ MEAN 449.77 488.01 495.93 500.06 505.04 506.61 509.08 519.45 519.37 MAX 476.97 494.62 498.11 503.63 506.60 507.15 514.71 520.81 520.17 MIN 418.70 478.01 494.52 498.24 503.81 505.93 507.16 516.61 518.81 517.97 519.30 516.34 519.66 522.71 517.04 A No gage-height record DAY RIO BDCANA BASIN 50113950 LAGO CERRILLOS AT DAMSITE, PR-Continued ELEVATION (FEET NGVD), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY OBSERVATION AT 24:00 VALUES 351 OCT NOV APR JUN AOG 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN MAX MIN 522.22 522.42 522.19 522.20 522.09 522.13 522.19 522.08 522.36 522.56 522.76 522.89 522.99 523.15 523.23 523.62 524.01 524.22 524.43 524.56 524.67 524.77 524.89 525.13 525.25 525.34 525.44 525.74 525.87 525.99 526.04 523.79 526.04 522.08 526.12 526.20 526.31 526.41 526.45 526.52 526.57 526.60 526.63 526.71 526.76 526.82 526.84 526.87 526.92 527.00 527.07 527.13 527.18 527.21 527.26 527.28 527.33 527.37 527.39 527.44 524.49 527.68 527.72 527.73 --- 526.87 527.73 524.49 527.78 527.79 527.82 527.84 527.86 527.88 527.91 527.91 527.94 527.92 527.98 527.99 528.05 528.30 528.26 528.34 528.36 528.38 528.39 528.77 528.82 528.84 528.91 528.92 528.93 528.94 528.96 528.97 528.98 528.99 529.00 528.38 529.00 527 .78 529.00 529.02 529.02 529.02 529.03 529.04 529.04 529.03 529.03 529.04 529.05 529.04 529.06 529.05 529.05 529.05 529.06 529.05 529.10 A 529.80 529.11 529.55 529.63 529.67 529.68 529.67 529.67 529.67 529.67 529.66 ___ ___ --- 529.69 529.67 529.67 529.67 529.65 529.61 529.61 529.62 529.61 529.59 529.59 529.59 529.57 529.58 529.58 529.58 529.57 529.56 529.54 529.54 529.53 529.53 529.55 529.56 529.54 529.51 529.50 530.09 ___ ___ 529.60 530.09 529.50 530.26 530.37 530.39 530.40 530.41 530.42 530.43 530.43 530.43 530.44 530.44 530.45 530.48 530.49 530.51 530.54 530.53 530.52 530.52 530.50 530.51 530.51 530.50 530.43 530.42 530.42 530.41 530.39 530.39 530.37 530.35 530.44 530.54 530.26 530.35 530.35 530.35 530.35 530.35 530.35 530.49 530.52 530.51 530.51 530.55 530.55 530.55 530.54 530.52 530.50 530.49 530.49 530.43 530.42 530.42 530.40 530.39 530.38 530.37 530.53 530.60 530.63 530.63 530.63 530.47 530.63 530.35 530.62 530.60 530.57 530.55 530.53 530.57 530.57 530.56 530.55 530.88 531.00 531.05 531.07 531.19 531.27 531.27 531.35 531.39 531.42 531.42 531.42 531.41 531.40 531.37 531.32 531.32 531.30 531.28 531.27 531.25 531.26 531.07 531.42 530.53 531.23 531.53 531.66 531.69 531.70 531.67 531.67 531.66 531.66 531.63 531.63 531.61 531.58 531.56 531.61 531.61 531.67 531.67 531.66 531.66 531.63 531.61 531.59 531.57 531.55 531.53 531.52 531.51 531.49 531.47 --- 531.59 531.70 531.23 531.45 531.43 531.47 531.43 531.42 531.39 531.38 531.36 531.32 531.29 531.27 531.25 531.25 531.16 531.23 531.17 531.14 531.16 531.15 531.13 531.10 531.07 531.06 530.99 531.05 531.00 530.98 530.97 530.93 530.88 530.87 531.19 531.47 530.87 530.84 530.82 530.79 530.81 530.77 530.77 530.76 531.57 531.67 531.66 A A A A A A A A A A A A A A A A A A A A A ___ ___ ___ A A A A A A A A A A A A A 533.02 533.00 533.00 533.08 533.22 533.21 533.75 534.08 534.16 534.76 535.60 535.82 535.94 535.98 535.98 536.05 536.23 ___ ___ ___ A No gage-height record 352 RIO BUCANA BASIN 50114000 RIO CERRILLOS NEAR PONCE, PR LOCATION.--Lat 18«04'15 I> , long 66°34'51", Hydrologic Unit 21010004, on right bank off Highway 139, 0.8 mi (1.3 km) below Lago Cerrillos Dam, 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 mi3 (46.1 km3 ), excludes 17.4 mi3 (45.1 km3 ), upstream from Lago Cerrillos Dam. WATER-DISCHARGE RECORDS PERIOD OF RECORD.--February to April 1964 (monthly measurements only), 1991 (semi-monthly measurements only). May 1991 to current year. May 1964 to June 1985, July 1985 to April GAGE.--Water-stage recorder. Datum of gage is 253.10 ft (77.145 m), above mean sea level, at site 0.15 mi (0.24 km) upstream and datum 9.90 ft (3.018 m) higher. Prior to March 22, 1977 REMARKS.--Records poor. Flow regulated by Lago Cerrillos Dam since May 1991. Gage-height and precipitation satellite telemetry at station. Prior to June 1985 some low-flow regulation by construction upstream. Maximum discharge prior to regulation, 22,400 ftVs (6.34 mVs), Sept. 16, 1975, gage-height, 11.2 ft (3.414 m), site and datum them in use from floodmarks, from rating curve extended above 150 ftVs (4.25 mVs), on basis of slope- area measurements of peak flow; minimum discharge prior to regulation, 2.2 ft'/s (0.062 mVs), May 28, 1967. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY OCT NOV JAN FEB MAR APR JUN JUL AUG SEP 1 122 8.1 2 36 7.9 3 98 7.9 4 94 7.9 5 84 7.9 6 53 7.5 7 119 7.2 8 102 7.1 9 14 7.0 10 14 6.8 11 14 6.5 12 14 6.2 13 14 6.0 14 15 6.0 15 15 5.8 16 15 6.1 17 16 6.5 18 16 6.6 19 15 6.7 20 15 6.7 21 15 6.6 22 14 6.7 23 14 6.9 24 12 6.9 25 10 6.7 26 9.5 6.5 27 9.3 6.7 28 10 7.3 29 9,1 7.4 30 8.7 7.4 31 8.4 --- TOTAL 1005.0 207.5 MEAN 32.4 6.92 MAX 122 8.1 MIN 8.4 5.8 AC-FT 1990 412 CFSM 1.82 .39 IN. 2.10 .43 STATISTICS OF MONTHLY MEAN MEAN 35.2 18.2 MAX 42.5 32.3 (WY) 1993 1993 MIN 30.8 6,92 (WY) 1992 1994 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MgAN ANNUAL SEVEN- DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE ANNUAL RUNOFF (AC-FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 7.6 7.4 7.4 7.4 7.6 7.6 7.6 7.6 7.8 7.9 7.9 7.8 7.8 18 26 8.4 8.4 8.4 8.4 8.5 8.4 8.4 8.2 8.1 8.1 8. 1 8.1 8.1 8.1 8.6 8.1 275.8 8.90 26 7.4 547 .50 .58 DATA 12.4 16.8 1993 8.90 1994 FOR 8.1 8.1 8.1 8.1 8.1 8.1 8.1 10 7.5 7.4 7.2 7.3 7.3 7.2 7.1 7.0 7.1 6.9 6.9 6.9 6.7 6.7 6.5 6.3 6.2 6.2 6.2 6.2 6.2 6.2 6.2 222.1 7.16 10 6.2 441 .40 .46 FOR WATER 28.6 74.2 1992 4.52 1993 6.2 6.2 6.3 6.5 6.5 6.5 6.5 6.5 6.5 6.5 6.5 6.5 6.5 6.7 6.6 6.5 6.5 6.8 6.5 6.5 6.2 6.2 6.2 6.2 9.7 6.2 6.2 7.5 ___ ___ --- 184.2 6.58 9.7 6.2 365 .37 .38 YEARS 1991 8.63 14.7 1992 4.37 1993 6.9 6.4 6.4 5.6 5.4 5.4 5.4 5.4 5.4 5.4 5.5 5.6 5.5 5.8 5.5 5.5 5.4 5.4 5.4 5.4 5.4 5.4 5.4 5.4 5.4 5.4 5.4 5,4 5.4 5.4 5.4 172.1 5.55 6.9 5.4 341 .31 .36 - 1994 7.49 10.6 1992 5.55 1994 1993 CALENDAR YEAR 7322. 20. 314 3. 3. 14520 1. 15. 58 7. 4. 3 1 May 27 2 Aug 14 4 Aug 8 13 30 2 2 5.4 5.4 5.4 5.4 5.4 5.4 5.6 5.4 5.2 5.5 5.8 5.4 5.2 5.2 5.2 5.2 5.5 5.6 5.4 5.4 5.4 5.4 5.4 5.4 5.4 7.5 5.9 5.6 5.6 5.6 --- 165.2 5,51 7.5 5.2 328 .31 .35 5.4 5.4 5.4 5.5 5.6 5.6 5.6 5.6 5.6 5.6 5.6 5.6 5.6 5.6 5.6 5.7 5.8 5.8 5.7 5.6 5.6 5.4 5.4 7.7 5.4 5.4 5.4 5.4 5.2 5,1 5.1 173.0 5.58 7.7 5.1 343 .31 .36 5.1 5.2 5.2 5.2 5.2 5.4 5.4 5.5 5.4 5.6 5.6 5.6 5.7 8.3 5.9 5.9 5.5 5.2 5.2 6.0 5.7 5.6 5.6 5.6 5.5 5.6 6,0 6.1 6.1 6.1 --- 170.0 5.67 8.3 5.1 337 .32 .36 6.1 5.8 5.9 5.9 6.0 5.9 7.2 5.7 5.6 5.6 5.8 5.6 5.6 5.4 5.9 5.8 5.6 5.8 5.7 5.7 5.6 5.8 5.6 5.6 5.8 5.6 5.7 6,1 6.6 6.7 6,7 182.4 5,88 7.2 5.4 362 .33 .38 6.6 6.5 7.5 6.5 6.5 6.5 6.3 6.3 5.9 6.0 5.9 5.8 5.9 7.7 5.9 5.6 5.6 5.6 5.5 5.4 5.2 5.2 6.8 7.2 6.9 6.4 6.2 5.8 5.3 5.2 5.1 188.8 6.09 7.7 5.1 374 .34 ,39 4.9 7.8 6.4 6.1 5.8 6.2 6.0 5.9 6.0 5.6 6.1 6.1 5,7 5.7 5.6 5.7 6.0 5.9 6.9 17 9.5 6.7 11 17 13 12 12 11 11 14— - 248.6 8,29 17 4.9 493 .47 .52 , BY WATER YEAR (WY) 12.3 24.6 1992 5.51 1994 FOR 1994 3194. 8. 122 4. 5. 599 5. 6340 . 6. 10 6. 5. 38.6 77.7 1993 5.58 1994 WATER YEAR 7 75 Oct I 9 Sep 1 2 May 29 Oct 7 68 Oct 7 49 68 2 4 21.7 33.7 1992 5.67 1994 16.9 24.6 1991 5.88 1994 WATER 20, 28. 8, 90Q , 1, 1100 6. 14730 1. 15. 42 8. 4. 19.0 24.6 1993 6.09 1994 YEARS 1991 - 3 6 75 Jan 6 64 Aug 19 7 Aug 24 Jan 6 07 Jan 6 14 52 9 7 16,7 31,5 1992 8,29 1994 1994 1992 1994 1992 1992 1992 1992 1992 RIO BDCANA 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, (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 3 (46.1 km3 ) HATER-QUALITY RECORDS PERIOD OF RECORD.--Hater years 1964 to current year. WATER-QUALITY DATA, HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 353 2.3 mi DATE OCT 1993 15... DEC 28. .. FEB 1994 28. .. MAY 05. .. JUN 29. .. AUO 30. .. DATE OCT 1993 15. .. DEC 28... FEB 1994 28... MAY 05. .. JUN 29. .. AUG 30. .. DATE OCT 1993 15. . . DEC 28. . . FEB 1994 28. . . MAY 05. . . JUN 29... AUG 30. .. TIME 1300 1140 1410 1105 0905 0925 HARD- NESS TOTAL (MG/L AS CACO3 ) 160 -- -- 160 -- 160 SILICA, DIS- SOLVED (MG/L AS SI 02) 24 -- -- 24 -- 26 DIS- CHARGE, INST. CUBIC FEET PER SECOND 15 8.1 6.1 3.8 6.1 5.4 CALCIUM DIS- SOLVED (MG/L AS CA) 53 -- -- 54 -- 53 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 244 -- -- 230 -- 233 SPE- CIFIC CON- DUCT- ANCE (US /CM) 363 365 355 358 365 353 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 6.4 -- -- 5.3 -- 6.0 SOLIDS, DIS- SOLVED (TONS PER DAY) 9.64 -- -- 2.33 -- 3.39 PH HATER WHOLE FIELD (STAND- ARD UNITS) 8.0 8.1 7.7 7.6 7.6 7.9 SODIUM, DIS- SOLVED (MG/L AS NA) 20 -- -- 17 -- 17 RESIDUE TOTAL AT 105 DEG. C, SUS- PENDED (MG/L) 2 7 1 1 33 68 TEMPER- ATURE HATER (DEG C) 29.0 26.0 25.0 26.0 25.0 26.0 SODIUM AD- SORP- TION RATIO 0.7 -- -- 0.6 -- 0.6 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.30 <0.20 <0.20 <0.20 <0.20 <0.20 TUR- BID- ITY (NTU) 0.30 7.3 <0.10 0.50 9.5 9.8 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 1.0 -- -- 0.60 -- 0.80 PHOS- PHORUS TOTAL (MG/L AS P) 0.030 <0.010 <0.010 0.020 0.040 0.060 OXYGEN, DIS- SOLVED (MG/L) 5.2 7.8 8.7 6.2 2.6 8.4 ALKA- LINITY WAT WH TOT FBT FIELD MG/L AS CACO3 150 140 150 150 150 150 ARSENIC TOTAL (UG/L AS AS) <1 -- -- <1 -- — OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 67 94 96 75 31 97 SULFIDE TOTAL (MG/L AS S) <0.5 -- -- <0.5 -- " BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 -- -- <100 -- -- OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) <10 13 <10 <10 43 10 SULFATE DIS- SOLVED (MG/L AS S04) 43 -- -- 32 -- 32 BORON, TOTAL RECOV- ERABLE (UG/L AS B) 30 -- -- 30 -- -- COLI- FORM, FECAL, 0.45 UM-MF (COLS./ 100 ML) K150 2100 50 K40 K890 400 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 6.8 -- -- 7.3 -- 7.6 CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- <1 -- -- STREP- TOCOCCI FECAL, (COLS. PER 100 ML) 2000 2600 <10 K40 910 250 FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.30 -- -- 0.30 -- 0.20 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) <1 -- -- <1 -- -- K = non- ideal count 354 RIO BUCANA BASIN 50114000 RIO CERRILLOS NEAR PONCE, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE OCT 1993 15. . . DEC 28. .. FEB 1994 28. .. MAY 05. .. JON 29. .. AOG 30... COPPER, TOTAL RECOV- ERABLE (OG/L AS CO) <10 -- — <10 -- -- IRON, TOTAL RECOV- ERABLE (OG/L AS FE) 40 -- -- 40 -- -- LEAD, TOTAL RECOV- ERABLE (OG/L AS PB) <1 -- -- 2 -- -- MANGA- NESE, TOTAL RECOV- ERABLE (OG/L AS MN) 30 -- -- 30 -- -- MERCURY TOTAL RECOV- ERABLE (OG/L AS HG) <0.10 — -- <0.10 -- -- SELE- NIUM, TOTAL (OG/L AS SB) <1 -- -- <1 -- -- SILVER, TOTAL RECOV- ERABLE (OG/L AS AG) <1 -- -- <1 -- -- ZINC, TOTAL RECOV- ERABLE (OG/L AS ZN) <10 -- -- <10 -- -- CYANIDE TOTAL PHENOLS (MG/L TOTAL AS CN) (OG/L) <0.010 <1 __ __ <0.010 2 __ __ MBTHY- LBNE BLOB ACTIVE SOB- STANCE (MG/L) <0.02 -- -- <0.02 -- -- 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 and 4.0 mi (6.4 km) downstream from Lago Cerrillos Dam, 2.8 mi (4.5 km) northeast of Degetau Plaza in Ponce. 355 DRAINAGE AREA.--24.9 mi 1 (64.5 km 1 )- 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. GAGB.--Water-stage recorder and crest-stage gage. Datum of gage is 116.40 ft (35.500 m) above mean sea level. Prior to Oct. 1, 1986, crest-stage gage located at Highway 14 bridge, at elevation of mean sea level. REMARKS.--Records poor. Flow regulated by Lago Cerrillos Dam 0.4 mi upstream. Oage-height and precipitation satellite telemetry at station. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 167 5.4 2 29 5.4 3 82 5.3 4 87 5.2 5 89 5.2 6 80 5.0 7 136 .9 8 125 .8 9 44 .7 10 14 .7 11 7.4 .9 12 6.7 .9 13 6.3 5.0 14 6.0 5.2 15 5.7 4.8 16 8.3 4.8 17 6.3 5.5 18 5.7 6.2 19 5.4 5.6 20 5.5 5.1 21 5.4 5.1 22 5.2 .9 23 5.2 .8 24 5.3 .8 25 6.6 .7 26 5.8 .7 27 5.0 .8 28 14 5.9 29 17 5.4 30 5.9 4.9 31 5.4 --- TOTAL 997.1 152.6 MEAN 32.2 5.09 MAX 167 6.2 MIN 5.0 4.7 AC-FT 1980 303 CFSM 1.29 .20 IN. 1.49 .23 STATISTICS OF MONTHLY MEAN MEAN 161 72.9 MAX 527 222 (WY) 1991 1988 MIN 15.1 5.09 (WY) 1993 1994 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN- DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE ANNUAL RUNOFF (AC-FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 4.9 4.9 4.9 5.0 5.0 .9 .7 .7 .7 .7 .7 .7 .7 11 18 9.6 4.3 4.2 7.6 4.8 4.4 .5 .6 .2 .2 .2 .3 .3 .3 .7 .4 170.1 5.49 18 4.2 337 .22 .25 DATA 19.3 49.1 1988 5.49 1994 FOR 4.4 4.4 4.3 .3 .4 .2 .3 .0 .8 .4 .4 .7 .7 .5 .3 .2 .5 .5 .5 .6 .7 .4 .5 .7 .5 .5 .5 .4 .4 .4 .5 139.9 4.51 6.0 4.2 277 .18 .21 FOR WATER 58.3 337 1992 4.51 1994 4.8 4.7 4.4 4.4 3.9 3.4 3.3 3.1 3.1 3.2 3.4 3.3 .2 .7 .3 .1 .0 .2 3.9 3.8 3.7 3.7 3.9 3.8 7.3 3.9 3.7 6.5 ___ ___ --- 114.7 4.10 7.3 3.1 228 .16 .17 YEARS 1987 9.51 17.3 1992 4.10 1994 7.7 6.5 5.6 4.4 4.7 4.3 4.2 4.3 4.1 4.3 4.1 4.2 4.4 4.5 4.3 4.4 3.9 4.1 4.1 4.1 4.1 4.3 4.4 4.2 4.1 4.2 4.4 4.2 4.3 4.4 4.3 139.1 4.49 7.7 3.9 276 .18 .21 - 1994 14.3 48.0 1989 4.49 1994 1993 CALENDAR YEAR 7345. 20. 331 3. 4. 14570 . 10. 54 7. 4. 6 1 Aug 15 8 Apr 11 3 Dec 23 81 97 2 7 4.4 4.5 4.8 4.8 4.8 4.8 5.8 4.6 4.2 5.1 6.5 5.0 4.5 4.6 4.5 4.5 5.0 4.7 4.3 4.3 4.1 4.0 4.0 3.9 3.9 7.1 6.5 4.5 4.3 4.3 142.3 4.74 7.1 3.9 282 .19 .21 4.3 4.3 4.2 4.2 4.3 4.1 4.3 4.1 4.2 4.3 4.4 4.4 4.3 4.3 4.4 4.3 4.5 4.2 4.4 4.1 4.0 4.1 4.0 5.5 4.4 4.2 4.2 4.3 4.3 4.2 4.3 133.1 4.29 5.5 4.0 264 .17 .20 4.3 4.4 5.0 4.7 4.7 4.7 4.6 4.6 4.7 4.7 5.1 5.9 5.3 6.2 6.0 5.2 5.5 5.0 4.9 5.1 5.3 4.9 .9 .4 .3 .4 .4 .6 .6 .5 --- 146.9 4.90 6.2 4.3 291 .20 .22 4.7 4.9 4.9 5.0 5.0 4.6 4.6 4.2 3.9 4.1 4.1 4.0 3.7 3.6 4.1 4.7 4.2 5.3 4.9 4.4 4.3 4.1 4.3 4.0 5.6 4.2 4.0 4.0 4.0 4.0 4.0 135.4 4.37 5.6 3.6 269 .18 .20 4.0 3.8 4.1 3.8 3.6 3.6 3.6 3.9 4.1 3.8 3.6 3.6 3.5 4.9 4.0 3.5 3.4 3.6 4.1 4.0 3.9 3.8 4.4 6.6 7.5 4.0 4.0 3.8 3.8 3.8 3.7 125.8 4.06 7.5 3.4 250 .16 .19 4.2 5.3 4.6 4.2 4.1 4.3 4.3 3.9 3.8 3.6 6.1 4.2 4.1 4.1 4.1 4.3 6.1 5.2 8.6 42 6.7 5.4 19 110 10 7.3 6.7 6.3 6.2 7.4 --- 316.1 10.5 110 3.6 627 .42 .47 , BY WATER YEAR (WY) 16.8 42.5 1992 4.74 1994 FOR 1994 2713 7 167 3 3 1160 10 5380 4 6 4 3 31.3 94.9 1992 4.29 1994 WATER YEAR .1 .43 Oct 1 . 1 Feb 8 . 3 Feb 6 Oct 7 .38 Oct 7 .30 .05 .5 .5 .9 31.5 80.5 1989 4.90 1994 22.6 51.4 1991 4.37 1994 WATER 48 78 7 4340 2 2 17400 13 34990 1 26 88 12 4 51.7 169 1988 4 .06 1994 YEARS 1987 .3 .0 .43 Jan .5 Sep . 8 Sep Oct .48 Oct .94 .35 .6 75.9 265 1989 7.12 1993 - 1994 1991 1994 6 1992 28 1992 23 1992 7 1985 7 1985 356 RIO PORTOGUES BASIN 50115000 RIO PORTOGUES NEAR PONCE, PR LOCATION.--Lat 18°04'45 H , long 66°38'01 H , 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 Chiguito, and 4.7 mi (7.6 km) north of Plaza Degetau in Ponce. DRAINAGE AREA.--8.82 mi' (22.84 km'). 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 poor. Some low-flow regulation due to unknown activity upstream. Gage-height and precipitation satellite telemetry at station. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY OCT NOV DEC JAN FBB MAR APR MAY JUN JUL AUG 1 82 6.1 2 56 5.9 3 44 5.8 4 61 5.7 5 46 5.0 6 25 5.2 7 128 5.2 8 72 5.2 9 19 4.9 10 11 5.2 11 10 5.6 12 9.0 5.4 13 8.2 4.9 14 7.4 5.0 15 7.2 5.2 16 12 6.2 17 11 6.7 18 7.9 7.3 19 7.1 6.6 20 6.5 5.4 21 5.6 5.5 22 5.5 e!3 23 7.4 e9.0 24 16 e5.8 25 7.5 e4.7 26 5.3 4.4 27 5.0 4.7 28 41 5.3 29 17 5.1 30 8.2 4.6 31 6.4 --- TOTAL 755.2 174.6 MEAN 24.4 5.82 MAX 12 8 13 KEN 5.0 4.4 AC-FT 1500 346 CFSM 2.76 .66 IN. 3.19 .74 STATISTICS OF MONTHLY MEAN MEAN 44.1 32.6 MAX 116 80.1 (WY) 1991 1988 KEN 11.9 5.82 (WY) 1992 1994 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN- DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE ANNUAL RUNOFF (AC-FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 7.2 5.8 5.5 6.0 6.4 6.6 6.1 6.0 5.5 5.5 7.6 7.1 16 24 12 5.9 5.5 5.5 5.5 13 7.3 6.9 e5.5 eS.O e4.7 e4.7 e4.4 e4.1 4.2 4.3 4.1 217.9 7.03 24 4.1 432 .80 .92 DATA 12.4 27.3 1988 2.71 1992 FOR 3.9 4.1 4.0 4.1 3.9 3.9 3.9 3.9 3.9 3.9 .0 .2 .0 .3 .9 .0 .3 .0 3.7 3.3 3.5 4.8 11 7.7 3.4 3.1 2.8 2.7 2.7 2.7 2.7 126.3 4.07 11 2.7 251 .46 .53 2.6 2.6 2.8 2.7 2.6 2.6 2.6 2.6 2.4 2.4 2.4 2.3 2.3 2.8 3.2 2.8 2.6 2.3 2.4 e2.7 2.6 2.5 2.5 2.8 2.3 2.2 2.2 18___ 86.8 3.10 18 2.2 172 .35 .37 FOR WATER YEARS 1964 8.85 45.5 1992 3.65 1989 6.07 13.3 1976 2.62 1989 12 9.6 3.1 2.5 2.5 2.3 2.1 2.1 2.1 2.3 2.1 2.1 2.9 2.3 2.3 3.0 2.2 2.0 2.0 2.0 2.0 2.0 1.9 1.8 1.8 1.8 1.8 1.7 1.7 1.7 1.7 83.4 2.69 12 1.7 165 .31 .35 - 1994 5.63 13.4 1976 2.08 1977 1993 CALENDAR YEAR 6047. 16. 225 4. 4. 11990 1. 25. 32 8. 5. 0 6 May 27 1 Dec 28 4 Dec 25 88 50 8 3 1.8 1.8 1.8 2.4 1.9 1.8 2.2 5.3 2.3 7.0 10 6.6 3.1 2.2 3.2 1.9 1.8 1.9 1.8 1.8 2.0 2.3 1.8 1.7 2.0 1.9 36 7.8 5.0 3.8 126.9 4.23 36 1.7 252 .48 .54 2.5 1.7 1.5 1.6 1.5 2.3 2.3 1.5 1.3 12 5.6 3.9 2.2 2.2 2.5 1.9 1.8 1.6 2.8 1.9 1.6 1.4 2.5 4.2 4.6 2.1 1.7 1.8 3.8 3.1 2.6 84.0 2.71 12 1.3 167 .31 .35 3.0 5.7 e26 e4.6 e3.9 3.8 3.2 2.6 2.3 1.8 1.9 1.8 2.1 2.1 15 17 18 12 4.5 3.8 3.3 3.1 2.7 2.9 2.6 1.6 1.1 3.8 1.2 .74 --- 158.14 5.27 26 .74 314 .60 .67 1.1 .76 1.2 1.3 1.0 1.4 e2.5 el. 3 el.l e.89 e.70 el. 4 el. 5 e.89 e.75 el. 5 el.l e2.4 e3.0 el. 7 el.l e.99 e.87 e.78 e5.0 e3.3 e.98 e.72 .61 .64 3.8 46.28 1.49 5.0 .61 92 .17 .20 2.4 1.4 .90 .86 1.3 2.1 1.4 1.2 4.1 1.7 1.2 .93 .93 5.4 5.1 1.9 1.2 1.3 6.4 7.4 1.5 1.1 1.4 11 24 3.3 2.1 57 30 5.3 2.6 188.42 6.08 57 .86 374 .69 .79 2.5 4.8 3.9 3.4 3.4 3.2 3.9 3.4 3.2 3.6 16 24 9.9 2.5 1.5 1.3 4.3 4.9 2.3 92 5.2 1.6 69 153 27 8.3 4.8 3.9 3.5 53 ___ 523.3 17.4 153 1.3 1040 1.98 2.21 , BY WATER YEAR (WY) 7.48 27.1 1983 2.45 1974 FOR 1994 2571. 7. 153 . 1. 923 6. 5100 10. 12 3. 1. 19.6 72.9 1985 1.65 1973 WATER YEAR 24 04 Sep 24 61 Jul 29 0 Jul 9 Oct 7 13 Oct 7 80 84 3 4 14.8 48.3 1979 2.33 1974 14.2 54.2 1979 1.49 1994 WATER 18. 38. 7. 2440 . 1. 21000 20. 13260 2. 28. 40 8. 3. 20.0 87.5 1979 4.20 1972 YEARS 1964 - 3 0 04 Sep 16 61 Jul 29 0 Jul 9 Oct 7 20 Oct 7 07 19 1 0 34.1 132 1975 7.22 1991 1994 1979 1994 1975 1994 1994 1985 1985 e Estimated RIO PORTUGUBS 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 1993 TO SEPTEMBER 1994 357 DATE OCT 1993 14. .. DEC 28... FBB 1994 28... MAY 05... JUN 29. . . AUG 22. .. DATE OCT 1993 14. .. DEC 28. .. FBB 1994 28. . . MAY 05. . . JUN 29. .. AUG 22. .. DATE OCT 1993 14. .. DEC 28... FBB 1994 28. . . MAY 05. . . JUN 29. .. AUG 22. .. TIME 1330 1445 1105 0905 1055 1000 HARD- NESS TOTAL (MG/L AS CAC03 ) 140 -- -- 150 -- 130 SILICA, DIS- SOLVED (MG/L AS SIO2) 22 -- -- 22 -- 22 DIS- CHARGE, INST. CUBIC FEET PER SECOND 10 9.7 2.2 1.3 1.2 1.1 CALCIUM DIS- SOLVED (MG/L AS CA) 45 -- -- 48 -- 39 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 194 -- -- 202 -- 184 SPE- CIFIC CON- DUCT- ANCE (US/CM) 288 316 322 323 313 304 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 7.2 -- -- 7.7 -- 7.2 SOLIDS, DIS- SOLVED (TONS PER DAY) 5.24 -- -- 0.72 -- 0.55 PH HATER WHOLE FIELD (STAND- ARD UNITS) 8.2 8.4 7.3 8.1 8.1 8.0 SODIUM, DIS- SOLVED (MG/L AS NA) 10 -- -- 13 -- 11 RESIDUE TOTAL AT 105 DEG. C, SUS- PENDED (MG/L) 1 1 <1 1 <1 5 TEMPER- ATURE WATER (DBG C) 27.0 25.5 23.0 24.5 24.5 27.5 SODIUM AD- SORP- TION RATIO 0.4 -- -- 0.5 -- 0.4 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) <0.20 <0.20 <0.20 <0.20 <0.20 <0.20 TUR- BID- ITY (NTU) 0.40 0.70 0.10 0.50 0.60 0.30 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 1.5 -- -- 2.1 -- 1.4 PHOS- PHORUS TOTAL (MG/L AS P) 0.040 0.020 0.030 0.050 0.040 0.020 OXYGEN, DIS- SOLVED (MG/L) 5.4 7.2 8.0 4.6 4.6 8.0 ALKA- LINITY WAT WH TOT FBT FIELD MG/L AS CAC03 150 140 150 150 140 140 ARSENIC TOTAL (UG/L AS AS) <1 -- -- <1 -- -- OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 68 85 92 55 55 100 SULFIDB TOTAL (MG/L AS S) <0.5 -- -- <0.5 -- " BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 -- -- <100 -- -- OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) <10 13 <10 <10 <10 14 SULFATB DIS- SOLVED (MG/L AS S04) 9.8 -- -- 9.4 -- 10 BORON, TOTAL RECOV- ERABLE (UG/L AS B) 10 -- -- 20 -- -- COLI- FORM, FECAL, 0.45 UM-MF (COLS./ 100 ML) 500 2400 100 K91 K130 160 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 9.3 -- -- 9.4 -- 9.1 CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- <1 -- -- STREP- TOCOCCI FECAL, (COLS. PER 100 ML) 230 2300 140 K180 340 230 FLUO- RIDB, DIS- SOLVED (MG/L AS F) 0.20 -- -- 0.10 -- <0.10 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) <1 -- -- <1 -- -- K = non-ideal count 358 RIO PORTUGUBS BASIN 50115000 RIO PORTDGDBS NEAR PONCE, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE OCT 1993 14. .. DEC 28. .. FBB 1994 28. . . MAY 05. .. -TON 29. . . ADG 22. .. COPPER, TOTAL RECOV- ERABLE (DG/L AS CD) <10 -- -- <10 -- -- IRON, TOTAL RECOV- ERABLE (DG/L AS FE) 40 -- -- 50 -- -- LEAD, TOTAL RECOV- ERABLE (DG/L AS PB) <1 -- -- 3 __ -- MANGA- NESE, TOTAL RECOV- ERABLE (DG/L AS MN) <10 -- __ <10 __ -- MERCURY TOTAL RECOV- ERABLE (DG/L AS HG) <0.10 -- __ <0.10 __ -- SELE- NIUM, TOTAL (DG/L AS SB) <1 -- -- <1 __ -- SILVER, TOTAL RECOV- ERABLE (DG/L AS AG) <1 -- -_ <1 __ -- ZINC, TOTAL RECOV- ERABLE (DG/L AS ZN) <10 -- -- <10 __ -- CYANIDE TOTAL PHENOLS (MG/L TOTAL AS CN) (DG/L) <0.010 1 __ __ <0.010 1 _- __ MBTHY- LENE BLUE ACTIVE SUB- STANCE (MG/L) <0.02 -- -- 0.02 -- -- RIO PORTOGOES BASIN 359 50116200 RIO PORTOGOES AT PONCE, PR HATER-QUALITY RECORDS LOCATION.--Lat 18°00'20", long 66°36'28", 1,300 ft (400 m) south of Las Americas Avenue Bridge, 1.2 ml (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 9 (49.0 km9 ). PERIOD OF RECORD.—Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE OCT 1993 15. .. DEC 23. . . FEB 1994 25. . . MAY 04. .. JUN 24. . . AOG 23. .. DATE OCT 1993 15... DEC 23. .. FEB 1994 25. .. MAY 04. .. JUN 24. . . AOG 23. .. DATE OCT 1993 15. .. DEC 23. . . FEB 1994 25. .. MAY 04. .. JUN 24. .. AUG 23. . . TIMS 0945 1245 0940 1030 0850 1015 HARD- NESS TOTAL (MG/L AS CACO3) 140 -- -- 200 -- 180 SILICA, DIS- SOLVED (MG/L AS SI02) 20 -- -- 21 -- 21 DIS- CHARGE, INST. CUBIC FEET PER SECOND 7.3 -- 5.4 2.2 0.74 3.5 CALCIUM DIS- SOLVED (MG/L AS CA) 43 -- -- 55 -- 51 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 230 -- -- 342 -- 315 SPE- CIFIC CON- DUCT- ANCE (US /CM) 359 -- 403 504 808 470 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 8.9 -- -- 14 -- 13 SOLIDS, DIS- SOLVED (TONS PER DAY) 4.54 -- -- 2.02 -- 2.96 PH WATER WHOLE FIELD (STAND- ARD UNITS) 8.1 -- 7.4 7.9 7.5 7.6 SODIUM, DIS- SOLVED (MG/L AS NA) 24 -- -- 46 -- 37 RESIDUE TOTAL AT 105 DEG. C, SUS- PENDED (MG/L) 3 7 47 27 7 28 TEMPER- ATURE WATER (DEG C) 29.0 — 22.0 26.5 24.5 28.0 SODIUM AD- SORP- TION RATIO 0.9 -- -- 1 -- 1 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.30 -- 0.40 0.60 0.60 1.1 TUR- BID- ITY (NTU) 2.6 0.70 20 17 1.4 1.0 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 1.6 -- -- 1.4 -- 1.9 PHOS- PHORUS TOTAL (MG/L AS P) 0.050 -- 0.090 0.070 0.090 0.500 OXYGEN, DIS- SOLVED (MG/L) 4.7 — 6.7 3.0 3.5 4.0 ALKA- LINITY WAT WH TOT PET FIELD MG/L AS CACO3 140 -- 150 170 200 160 ARSENIC TOTAL (UG/L AS AS) <1 — -- <1 -- — OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 59 -- 76 36 41 50 SULFIDE TOTAL (MG/L AS S) <0.5 -- -- <0.5 -- — — BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) 100 -- -- <100 -- -- OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) <10 10 12 12 21 18 SULFATE DIS- SOLVED (MG/L AS SO4) 31 -- -- 62 -- 56 BORON, TOTAL RECOV- ERABLE (OG/L AS B) 60 -- -- 100 -- -- COLI- FORM, FECAL, 0.45 UM-MF (COLS./ 100 ML) 550 -- 3500 2100 2000 5600 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 17 -- -- 40 -- 39 CADMIUM TOTAL RECOV- ERABLE (OG/L AS CD) 2 -- -- <1 -- -- STREP- TOCOCCI FECAL, (COLS. PER 100 ML) 270 -- 140 K190 840 2200 FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.20 -- -- 0.20 -- 0.10 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) <1 -- -- <1 -- -- K = non-ideal count 360 RIO PORTDGOES BASIN 50116200 RIO PORTOOUBS AT PONCE, PR--Continued WATER-QUALITY DATA, HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE OCT 1993 15. .. DEC 23. .. FEB 1994 25. .. MAY 04... JUN 24. .. AUG 23. .. COPPER, TOTAL RECOV- ERABLE (DO/L IRON, TOTAL RECOV- ERABLE (DO/L LEAD, TOTAL RECOV- ERABLE (OO/L MANGA- NESE, TOTAL RECOV- ERABLE (OO/L MERCURY TOTAL RECOV- ERABLE (UO/L SELE- NIUM, TOTAL (UO/L SILVER, TOTAL RECOV- ERABLE (UO/L ZINC, TOTAL RECOV- ERABLE (DO/L CYANIDE TOTAL (MO/L PHENOLS TOTAL MBTHY- LENB BLUB ACTIVE SUB- STANCE AS CU) AS FB) AS PB) AS MN) AS HO) AS SB) AS AO) AS ZN) AS CN) (UO/L) 380 <1 30 <0.10 810 90 <0.10 <0.010 10 <0.010 (MG/L) 0.02 <0.02 PESTICIDE ANALYSES DATE JUN 1994 24. .. DATE JUN 1994 24.. . DATE JUN 1994 24. .. CHLOR- DI- DI- ENDO- PCB, ALDRIN, DANE, DDD, DDE, DDT, AZINON, BLDRIN SULFAN, TIME TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (DG/L) (UO/L) (UO/L) (UO/L) (DG/L) (UO/L) (UO/L) (UO/L) (UO/L) 0850 ENDRIN HATER UNFLTRD REC (DG/L) <0.010 PARA- THION, TOTAL (UO/L) <0.1 <0 BTHION, TOTAL (DO/L) <0.01 NAPH- THA- LENES, POLY- CHLOR. TOTAL (UO/L) .010 HBPTA- CHLOR, TOTAL (OO/L) <0.010 PBR- THANE TOTAL (OO/L) <0.1 <0 HEPTA- CHLOR BPOXIDB TOTAL (DO/L) <0.010 TOX- APHBNE, TOTAL (OO/L) .010 <0 LINDANE TOTAL (OG/L) <0.010 TOTAL TRI- THION (OO/L) .010 <0. MALA- THION, TOTAL (OO/L) <0.01 2,4-D, TOTAL (OO/L) ,010 METH- OXY- CHLOR, TOTAL (DO/L) <0.01 2,4,5-T TOTAL (OO/L) 0.01 <0. METHYL PARA- THION, TOTAL (DO/L) <0.01 2, 4-DP TOTAL (DG/L) ,010 <0.010 MIRBX, TOTAL (DO/L) <0.01 SILVEX, TOTAL (OO/L) <0.01 <0.10 <0.01 <0.01 <0.01 <0.01 <0.01 RIO GUAYANILLA BASIN 50124200 RIO GUAYANILLA NEAR GUAYANILLA, PR 361 LOCATION.--Lat 18002'40", 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 mi 1 (49.0 km 1 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--March 1981 to current year. GAGE.--Water-stage recorder. Elevation of gage is 80 ft (24 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. Gage-height and precipitation satellite telemetry at station. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY OCT NOV DEC JAN FBB MAR APR MAY JDN JDL AUG SEP 1 34 7.4 2 18 8.5 3 75 34 4 56 23 5 29 36 6 70 15 7 13 1 8.5 8 107 8.8 9 53 8.6 10 38 8.9 11 31 132 12 26 e33 13 22 e!7 14 20 16 15 18 ell 16 25 9.3 17 26 e!5 18 19 el7 19 15 12 20 14 14 21 12 13 22 12 9.0 23 11 7.9 24 11 7.9 25 12 7.4 26 8.6 6.2 27 9.8 6.0 28 20 5.6 29 18 6.0 30 10 5.7 31 7.4 - — TOTAL 958.8 509.7 MEAN 30.9 17.0 MAX 131 132 MIN 7.4 5.6 AC-FT 1900 1010 CFSM 1.64 .90 IN. 1.89 1.00 STATISTICS OF MONTHLY MEAN MEAN 65.2 51.1 MAX 167 110 (WY) 1986 1988 MIN 16.0 17.0 (WY) 1983 1994 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN- DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE ANNUAL RUNOFF (AC-FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 5.4 5.2 4.6 4.6 5.0 4.9 4.5 4.3 4.0 4.0 4.3 3.7 4.2 32 9.3 4.9 4.3 4.1 4.2 11 6.5 35 8.5 4.6 4.0 3.7 3.7 3.5 3.4 3.5 3.4 208.3 6.72 35 3.4 413 .36 .41 DATA 19.3 41.9 1988 6.72 1994 FOR 3.4 3.3 3.0 2.8 3.0 2.9 3.1 3.6 3.0 3.0 3.3 4.5 3.2 3.7 3.1 3.0 2.9 3.2 2.8 2.8 3.4 4.7 7.1 18 11 5.3 5.7 3.6 2.8 2.8 2.6 130.6 4.21 18 2.6 259 .22 .26 2.7 2.6 2.9 3.0 3.5 3.4 3.5 3.2 3.1 3.0 2.7 2.2 2.2 2.7 3.8 3.0 2.4 2.3 2.9 5.9 6.4 6.2 9.0 15 6.7 6.0 6.0 9.7 ___ ___ --- 126.0 4.50 15 2.2 250 .24 .25 FOR WATER YEARS 1981 10.8 27.5 1992 4.21 1994 7.19 11.4 1985 3.10 1990 e3.5 e6.6 e8.8 e6.4 eS.O e4.5 e4.3 e4.1 e4.0 e3.7 e3.5 e3.6 e3.8 4.9 4.3 10 5.4 4.4 4.3 3.9 4.0 3.9 3.6 3.4 3.4 3.4 3.4 3.3 3.4 4.0 3.7 138.5 4.47 10 3.3 275 .24 .27 - 1994 5.95 13.2 1989 2.85 1981 1993 CALENDAR YEAR 7746.9 21.2 218 2.9 3.1 15370 1.12 15.25 41 11 4.2 May 9 Apr 3 Apr 2 3.1 5.7 5.5 6.0 4.2 8.8 5.7 3.1 2.3 11 20 16 4.1 3.6 11 6.1 4.5 4.1 3.8 3.6 3.1 3.1 e2.8 2.9 4.3 2.5 23 30 8.3 6.3 —— 218.5 7.28 30 2.3 433 .39 .43 3.9 3.0 2.7 2.6 2.7 3.9 2.5 2.2 2.3 3.6 2.4 1.7 1.7 1.9 2.0 2.0 2.4 2.4 2.2 2.0 1.6 1.3 1.4 1.7 1.4 1.7 1.9 2.5 2.7 2.9 2.9 72.1 2.33 3.9 1.3 143 .12 .14 2.5 2.9 48 5.8 2.5 2.0 2.0 2.0 1.8 1.8 1.7 1.7 1.9 2.0 1.8 2.6 2.7 2.0 2.0 1.9 2.1 1.9 2.2 1.9 1.9 1.9 2.1 1.9 2.5 2.7 --- 112.7 3.76 48 1.7 224 .20 .22 3.4 4.9 3.5 6.1 4.6 7.2 2.6 2.3 1.7 1.6 1.4 1.7 1.4 1.2 1.4 3.0 2.2 1.4 2.5 2.0 1.3 1.1 .98 .84 1.8 2.1 1.5 1.0 .84 .77 7.7 76.03 2.45 7.7 .77 151 .13 .15 3.5 1.6 1.3 1.1 1.7 1.6 1.0 1.1 2.4 2.7 2.0 1.2 .93 8.5 13 1.6 .89 1.9 1.8 3.9 1.7 1.1 40 40 37 7.9 3.6 2.3 2.9 1.8 1.4 193.42 6.24 40 .89 384 .33 .38 1.5 1.5 2.1 1.3 .95 1.1 1.5 1.2 .96 .91 5.5 4.1 4.5 2.1 1.6 1.4 1.4 4.0 4.1 36 24 4.3 5.1 156 40 17 8.1 24 9.9 153 --- 519.12 17.3 156 .91 1030 .92 1.02 , BY WATER YEAR (WY) 10.9 26.6 1983 4.39 1984 FOR 1994 3263 8 156 1 1400 10 6470 6 19 3 1 29.1 80.4 1985 2.33 1994 WATER YEAR .77 .94 Sep 24 .77 Jul 30 . 1 Sep 4 Sep 30 .54 Sep 30 .47 .42 .6 .6 15.1 41.0 1987 3.28 1991 11.8 25.9 1986 2.45 1994 WATER 23 33 8 1500 1 14700 20 16830 1 16 51 9 3 17.8 48.5 1988 6.24 1994 YEARS 1981 .2 .1 .94 Oct .77 Jul .1 Sep Sep .40 Sep .23 .70 .9 .4 39.3 102 1981 7.46 1983 - 1994 1986 1994 7 1985 30 1994 4 1994 12 1982 12 1982 e Estimated 362 RIO GOAYANILLA 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 mi 1 (59.1 km 1 ). PERIOD OF RECORD.--Water years 1960-65, 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 OCT 18 DEC 23 MAR 04 APR 13 JUN 22 AUG 24 OCT 18 DEC 23 MAR 04 APR 13 JUN 22 AUG 24 OCT 18 DEC 23 MAR 04 APR 13 OUN 22 AUG 24 DATE 1993 1994 DATE 1993 1994 DATE 1993 . . . 1994 TIME 1220 1045 1020 0910 0915 1015 HARD- NESS TOTAL (MG/L AS CACO3 ) 150 -- -- 250 -- 140 SILICA, DIS- SOLVED (MG/L AS SI02) 19 -- -- 27 -- 13 DIS- CHARGE, INST. CUBIC FEET PER SECOND 4.0 __ 0.0 0.64 0.63 8.9 CALCIUM DIS- SOLVED (MG/L AS CA) 42 -- -- 71 -- 35 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 231 -- -- 479 -- 837 SPE- CIFIC CON- DUCT- ANCE (US /CM) 361 -- 456 808 949 326 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 12 -- __ 18 -- 13 SOLIDS, DIS- SOLVED (TONS PER DAY) 2.47 -- -- 0.83 — 20.1 PH WATER WHOLE FIELD (STAND- ARD UNITS) 7.8 __ 7.2 7.5 7.2 7.2 SODIUM, DIS- SOLVED (MG/L AS NA) 17 -- -- 69 -- 35 RESIDUE TOTAL AT 105 DBG. C, SUS- PENDED (MG/L) 13 9 7 8 1 256 TEMPER- ATURE HATER (DBO C) 31.0 — 27.0 27.5 28.0 27.0 SODIUM AD- SORP- TION RATIO 0.6 _- -- 2 -_ 1 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.30 0.60 0.60 -- 3.0 0.50 TUR- BID- ITY (NTU) 1.5 17 0.80 3.1 1.0 200 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 3.1 -- -- 8.9 -- 4.8 PHOS- PHORUS TOTAL (MG/L AS P) 0.270 0.840 0.140 -- 2.90 0.070 OXYGEN, DIS- SOLVED (MG/L) 5.4 — 6.4 1.6 0.2 5.0 ALKA- LINITY WAT WH TOT FBT FIELD MG/L AS CAC03 140 __ 160 240 230 94 ARSENIC TOTAL (UG/L AS AS) 1 -- _- 1 -- -- OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 70 -- 80 20 3 62 SULFIDB TOTAL (MG/L AS S) <0.5 -- -- 3.5 -- - - BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) 100 -- -- <100 -- -- OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) <10 23 11 30 18 33 SULFATE DIS- SOLVED (MG/L AS S04) 37 -- -- 78 -- 120 BORON, TOTAL RECOV- ERABLE (UG/L AS B) 30 -- -- 180 -- -- COLI- FORM, FECAL, 0.45 UM-MF (COLS./ 100 ML) 200 -- 6100 K10 250 2000 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 17 -- -- 63 -- 560 CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) 3 -- -- <1 -- -- STREP- TOCOCCI FECAL, (COLS. PER 100 ML) K140 -- 1000 K40 2100 36000 FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.10 -- -- 0.20 -- 0.10 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) <1 -- — <1 -- -- K = non-ideal count RIO GUAYANILLA BASIN 363 50124700 RIO GOA VANILLA AT CENTRAL RUFINA, PR—Continued WATER-QOALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 COPPER, IRON, TOTAL TOTAL RECOV- RECOV- ERABLE BRABLB DATE (OG/L (OG/L LEAD, TOTAL RECOV- ERABLE (UG/L MANGA- NESE, MERCURY TOTAL TOTAL RECOV- ERABLE RECOV- ERABLE (OG/L (OG/L SELE- NIUM, TOTAL (UG/L SILVER, TOTAL RECOV- ERABLE (UG/L ZINC, TOTAL RBCOV- CYANIDE BRABLB TOTAL (UG/L (M6/L MBTHY- LENB BLUB ACTIVE PHENOLS SUB- TOTAL AS CO) AS PE) AS PB) AS MN) AS HG) AS SB) AS AG) AS ZN) AS CN) (OG/L) STANCE (MG/L) OCT 1993 18. .. DEC 23. .. MAR 1994 04. .. APR 13. .. JUN 22. . . AOG 24. .. 360 280 40 120 <0.10 <0.10 <0.010 <1 0.03 20 0.020 <1 0.09 364 RIO YAOCO BASIN 50125780 LAGO LOCCHETTI AT DAMSITE, PR LOCATION.--Lat 18°05'37", long 66°51'54' (6.3 km) north of Yauco. DRAINAGE AREA.--17.4 mi 1 (45.1 km 1 ). Hydrologic Unit 21010004, at Antonio Lucchetti Dam on Rio Yauco, 3.9 mi ELEVATION RECORDS PERIOD OF RECORD.--December 1989 to current year. GAGE.--Water-stage recorder. Datum of gage is mean sea level. REMARKS.--Lago Lucchetti was completed in 1952. The dam is on Rio Yauco and is a unit of the Southwestern Puerto Rico Project. It provides 16,500 acre-feet (20.3 hm3 ) of usable storage for power generation and irrigation. The dam is a concrete gravity structure with a total length of 591 ft (180 m), a maximum height of 178 ft (54 ra), and a maximum width at the base of 150 ft (46 m) . An ungated, overflow type spillway with a clear length of 171 ft (52 m) and a crest elevation of 570 ft (174 m) , occupies the central portion of the dam. The spillway was designed for a maximum capacity of 62,800 ftVs (1,778 ra'/s) at a design head of 20 ft (6 m). The dam is owned by Puerto Rico Electric Power Authority. Gage-height and precipitation satellite telemetry at station. EXTREMES OBSERVED FOR PERIOD OF RECORD.--Maximum elevation, 572.19 ft (174.40 m), May 27, 1993; minimum elevation, 512.09 ft (156.08 m), Sept. 9, 1994. EXTREMES OBSERVED FOR CURRENT YEAR.--Maximum elevation, 569.72 ft (173.65 ra), Nov.4; minimum elevation, 512.09 ft (156.08 m), Sept. 9. DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN MAX MIN Capacity Table (based on data from Puerto Rico Water Resources Authority) Elevation, in feet 512 520 525 527 530 532 Contents, in acre-feet 1,505 2,385 2,965 3,255 3,695 3,975 Elevation, in feet 540 550 561 563 571 573 Contents, in acre-feet 5,165 7,020 9,600 10,125 12,125 12,645 ELEVATION (FEET NGVD), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY OBSERVATION AT 24:00 VALUES OCT NOV DEC JAN FBB APR MAY JUN JOL 566.85 566.85 567.53 568.31 A A A A A A A A A 565.33 564.55 564.96 565.16 565.27 565.79 566.18 566.35 566.74 566.25 565.63 565.87 565.91 566.60 567.55 568.61 568.61 568.24 568.34 568.87 569.66 569.22 568.81 568.89 569.25 568.98 568.99 568.77 568.37 568.01 567.97 567.62 567.77 566.11 566.16 565.61 565.09 564.58 A A A A A 561.41 561.22 560.96 560.62 A ___ 559.54 558.95 559.23 559.78 559.76 559.87 560.03 560.26 560.21 A 560.15 560.11 560.34 560.38 561.02 561.43 561.45 561.29 561.19 561.08 561.30 561.21 560.74 560.69 560.67 560.61 560.57 560.51 560.46 560.46 560.69 560.70 560.64 559.96 559.92 558.98 557.77 558.45 558.86 559.00 559.38 559.98 560.55 560.22 560.12 560.18 560.17 560.09 559.87 559.83 559.83 559.80 559.25 559.16 559.23 559.31 559.32 559.30 559.24 558.65 558.63 558.58 558.57 558.71 558.61 558.54 558.42 558.31 558.23 558.16 558.08 558.01 557.46 557.19 557.12 557.26 557.23 557.16 556.82 556.58 556.03 555.96 556.04 556.37 556.48 556.63 557.35 557.52 557.45 558.75 ___ ___ ___ 559.63 559.89 560.96 560.72 560.65 560.61 561.94 562.58 563.71 563.52 564.22 565.21 565.68 566.22 566.15 566.90 567.04 566.80 566.60 566.28 567.15 567.08 567.00 566.92 566.84 566.76 566.65 566.55 567.01 567.16 567.26 566.77 566.66 566.70 566.65 565.86 565.57 565.37 565.18 565.13 565.12 565.77 A A A A A A A A 565.58 565.80 566.07 566.30 567.82 568.78 568.86 568.00 567.20 565.83 566.56 ___ 566.47 566.42 566.36 566.30 565.70 564.90 564.84 564.78 564.72 564.05 563.26 562.40 562.33 563.74 564.60 564.57 564.53 563.82 562.94 562.10 561.28 561.54 562.11 561.73 561.65 561.76 . 562.02 561.16 561.09 561.03 560.96 560.09 559.34 558.57 558.50 558.45 557.61 556.54 555.94 555.30 554.29 553.58 552.82 552.75 552.69 552.16 551.33 550.65 550.35 550.27 549.26 548.98 548.28 547.39 547.27 547.17 547.10 546.00 544.88 543.80 543.72 ___ 543.11 542.55 541.46 A A A A A A A A A A A A A A A A A A A A A A A A A A A A AOG A A A A A A A A A A A A A A A A A A A A A A A A A A A A A 514.70 514.59 559.52 557.47 564.89 560.70 558.75 567.26 557.77 555.96 559.63 563.39 551.84 566.47 560.09 560.96 543.72 SEP 513.76 513.59 513.48 513.47 513.41 512.28 512.27 512.18 514.99 519.08 520.33 522.32 520.64 520.56 520.47 520.35 520.31 520.31 520.70 521.69 521.81 521.82 521.95 523.69 524.70 524.77 524.77 524.75 525.10 526.66 519.54 526.66 512.18 A No gage-height record. RIO LOCO BASIN 365 50129700 RIO LOCO AT GOANICA, PR HATER-QUALITY RECORDS LOCATION.--Lat 17°58'33", long 66°54'52", 0.6 ml (1.0 km) northwest of Guanica and 1.2 ml (1.9 km) northeast of Bnsenada. DRAINAGE ARBA.--Indeterminate. PERIOD OP RECORD.--Water years 1975 to current year. HATER-QUALITY DATA, HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE OCT 1993 14. .. DEC 23. .. MAR 1994 04. .. APR 13. .. JUN 22. . . AUG 24. . . DATE OCT 1993 14.. . DEC 23. . . MAR 1994 04... APR 13. .. JUN 22. .. AUG 24... DATE OCT 1993 14. . . DEC 23. . . MAR 1994 04. . . APR 13. .. JUN 22. . . AUG 24. .. TIME 1545 0915 0900 1040 1010 0900 HARD- NESS TOTAL (MG/L AS CACO3 ) 110 -- -- -- -- " SILICA, DIS- SOLVED (MG/L AS SIO2) 19 -- -- -- -- 19 DIS- CHARGE, INST. CUBIC FEET PER SECOND -- -- -- -- -- - - CALCIUM DIS- SOLVED (MG/L AS CA) 27 -- -- -- -- " SOLIDS, SUM OP CONSTI- TUENTS, DIS- SOLVED (MG/L) 159 -- -- -- -- -- SPE- CIFIC CON- DUCT- ANCE (US/CM) 252 -- 2200 11800 25900 2340 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 11 -- -- -- -- — - RESIDUE TOTAL AT 105 DBG. C, SUS- PENDED (MG/L) 24 17 10 -- 14 13 PH HATER WHOLE FIELD (STAND- ARD UNITS) 7.8 -- 7.4 7.2 7.1 7.2 SODIUM, DIS- SOLVED (MG/L AS NA) 11 -- -- -- -- 180 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.30 0.30 0.70 -- 0.30 0.30 TEMPER- ATURE WATER (DBG C) 30.0 -- 26.0 28.0 29.5 30.0 SODIUM AD- SORP- TION RATIO 0.5 — -- — -- — - PHOS- PHORUS TOTAL (MG/L AS P) 0.160 0.050 0.150 -- 0.040 0.070 TUR- BID- ITY (NTU) 28 15 0.50 -- 1.2 0.60 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 2.1 -- -- -- -- 180 ARSENIC TOTAL (UG/L AS AS) <1 -- -- 2 -- -- OXYGEN, DIS- SOLVED (MG/L) 4.2 -- 2.4 1.4 0.5 0.6 ALKA- LINITY HAT WH TOT PET FIELD MG/L AS CAC03 110 -- 220 210 230 210 BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 -- -- <100 -- -- OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 54 -- 42 17 6 8 SULFIDB TOTAL (MG/L AS S) <0.5 -- -- <0.5 -- " BORON, TOTAL RECOV- ERABLE (UG/L AS B) 30 -- -- 980 -- -- OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) <10 20 190 -- 500 430 SULPATB DIS- SOLVED (MG/L AS S04) 12 -- -- -- -- 1100 CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- <1 ~- -- COLI- PORM, FECAL, 0.45 UM-MF (COLS./ 100 ML) 740 -- 270 410 K150 220 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 11 -- -- -- -- 8400 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) 13 -- -- 1 -- -- STREP- TOCOCCI FECAL, (COLS. PER 100 ML) 1100 -- 830 610 240 3900 FLUO- RIDB, DIS- SOLVED (MG/L AS P) 0.20 -- -- -- — 0.50 COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) <10 -- -- 20 -- -- K = non-ideal count 366 RIO LOCO BASIN 50129700 RIO LOCO AT GUANICA, PR—Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE OCT 1993 14.. . DEC 23.. . MAR 1994 04.. . APR 13... JUN 22.. . AUG 24.. . DATE JUN 1994 22. .. MANGA- IRON, LEAD, NBSE, MERCURY SILVER, ZINC, TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL AS FE) AS PB) AS MN) AS HG) AS SB) AS AG) AS ZN) AS CN) (UG/L) 2000 1 90 <0.10 <1 <1 <10 <0.010 __ __ 160 <1 110 <0.10 <1 <1 20 <0.010 <1 __ PESTICIDE ANALYSES CHLOR- DI- DI- PCB, ALDRIN, DANE, DDD, DDE, DDT, AZINON, ELDRIN TIME TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) 1010 <0.1 <0.010 <0.1 <0.010 <0.010 <0.010 <0.01 <0.010 ENDRIN HEPTA- METH- METHYL WATER HEPTA- CHLOR MALA- OXY- PARA- MBTHY- LENE BLUE ACTIVE SUB- STANCE (MG/L) <0.02 — -- 0.04 — ENDO- SULFAN, TOTAL (UG/L) <0.010 UNFLTRD ETHION, CHLOR, EPOXIDE LINDANE THION, CHLOR, THION, MIRBX, DATE REC 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 1994 22. .. <0.010 <0.01 <0.010 <0.010 <0.010 <0.01 <0.01 <0.01 <0, NAPH- THA- LENES, PARA- POLY- PER- TOX- TOTAL .01 THION, CHLOR. THANE APHENE, TRI- 2,4-D, 2,4,5-T 2, 4-DP SILVBX, 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 1994 22.. . <0.01 <0.10 <0.1 <1 <0.01 <0.01 <0.01 <0.01 <0 .01 01 23456 KILOMETERS 01234 MILES EXPLANATION 1380 SURFACE-WATER STATION AND NUMBER 1297 QUALITY-OF-WATER STATION AND NUMBER 143 WELL AND WELL NUMBER Figure 25.--Rio Guanajibo basin, Co 0) N 368 RZO GUANAJIBO BASIN 50131990 RIO GUANAJIBO AT HWY 119 AT SAN GERMAN, PR LOCATION.--Lat 18°05'06", long 67°02'02", Hydrologic Unit 21010003, on right bank, at bridge on Hwy 119, 0.6 mi (1.0 km) southwest of junction of Highways 119 and 2, 0.2 mi (0.3 km) northeast of junction of Highways 119 and 102, 0.7 mi (1.1 km) east from public Plaza of San German. DRAINAGE AREA.--34.6 mi 1 (89.6 km1 ). WATER-DISCHARGE RECORDS PERIOD OP RECORD.--April 1991 to current year. GAGE.—Water-stage recorder. Elevation of gage is 148 ft (45 m), from topographic map. REMARKS.--Records poor. Gage-height and precipitation satellite telemetry at station. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY NOV JAN MAR APR MAY JUN JUL AUG SEP 1 52 15 2 60 17 3 73 24 4 49 29 5 35 17 6 44 15 7 122 19 8 114 19 9 69 20 10 51 20 11 45 23 12 40 24 13 37 23 14 37 22 15 34 22 16 62 19 17 53 18 18 41 18 19 36 16 20 32 17 21 27 16 22 26 17 23 24 17 24 22 17 25 21 17 26 19 18 27 16 18 28 22 21 29 24 21 30 16 17 31 14 —— TOTAL 1317 576 MEAN 42.5 19.2 MAX 122 29 MIN 14 15 MED 37 18 AC-PT 2610 1140 CPSM 1.23 .55 IN. 1.42 .62 STATISTICS OP MONTHLY MEAN MEAN 69.2 52.6 MAX 205 123 (WY) 1993 1993 MIN 20.4 15.8 (WY) 1992 1992 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST PAILY MEAN ANNUAL SEVEN-DAY MINIMUM INSTANTANEOUS PEAK PLOW INSTANTANEOUS PEAK STAGE ANNUAL RUNOFP (AC-PT) ANNUAL RUNOPP (CPSM) ANNUAL RUNOPP (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 17 15 15 13 13 12 12 11 12 12 12 13 13 12 13 14 15 15 15 16 17 14 14 12 12 12 12 12 10 10 10 405 13.1 17 10 13 803 .38 .44 DATA 24.5 52.2 1993 8.21 1992 FOR 11 11 12 12 12 9.8 23 15 10 9.8 10 9.9 8.9 8.2 7.8 8.1 7.8 7.9 7.3 7.6 7.4 6.3 16 27 9.0 7.1 7.8 12 6.5 8.2 7.6 324.0 10.5 27 6.3 9.0 643 .30 .35 6.8 7.2 6.6 6.7 6.9 6.5 8.5 8.9 8.0 7.0 6.6 7.1 6.6 9.0 8.6 8.9 5.0 5.2 5.6 5.5 5.0 4.0 6.0 7.3 6.0 6.9 7.7 22 ___ ___ —— 206.1 7.36 22 4.0 6.8 409 .21 .22 FOR WATER YEARS 1991 26.0 37.3 1992 10.5 1994 12.5 26.2 1993 4.32 1992 19 29 8.9 6.4 6.3 6.5 6.1 6.0 6.3 6.6 6.4 20 27 8.6 7.9 6.9 6.1 6.0 6.3 7.7 8.3 6.8 8.8 7.5 7.2 6.7 8.1 9.4 8.5 7.2 5,8 288.3 9.30 29 5.8 7.2 572 .27 .31 - 1994 8.11 11.5 1993 3.52 1992 1993 CALENDAR YEAR 11241.0 30.8 300 7.0 7.8 22300 .89 12.09 60 21 12 May 31 Apr 6 Apr 1 11 38 49 10 38 49 91 59 25 18 15 23 10 9.1 16 45 20 13 10 8.0 6.9 6.6 5.3 5.5 5.4 5.4 65 74 21 11 ___ 763.2 25.4 91 5.3 15 1510 .74 .82 , BY WATER 19.0 25.4 1994 11.7 1992 8.6 6.7 6.1 5.7 6.2 5.8 5.6 5.6 5.0 5.1 6.1 7.0 6.6 5.1 5.2 4.5 4.1 3.5 3.6 3.6 3.2 2.9 2.6 2.9 3.5 6.1 6.2 6.4 5.6 4.4 4.8 158,3 5.11 8.6 2.6 5.2 314 .15 .17 YEAR (WY) 38.3 69.5 1993 5.11 1994 3.1 3.1 2.5 2.4 2.4 2.8 2.4 3.2 3.6 3.6 4.1 4.1 4.1 5.0 4.3 3.8 2.7 2.7 3.1 2.6 2.2 3.3 2.9 3.1 3.1 3.5 19 8.6 3.3 2.6 --- 117.2 3.91 19 2,2 3.1 232 .11 .13 16.7 46.3 1993 3.91 1994 FOR 1994 WATER YEAR 6060.7 16.6 220 2.1 2.7 753 7.14 12020 .48 6.52 38 8.6 3.2 Sep 20 Jul 2 Jun 1 Oct 7 Oct 7 2.3 2.1 2.7 7.3 19 6.7 7.3 6.1 3.9 3.6 3.6 3.2 2.7 2.4 2.7 4.5 3.8 2.9 3.6 2.8 3.1 3.1 2.9 2.8 29 27 11 7.5 6.0 7.5 14 207.1 6.68 29 2.1 3.6 411 .19 ,22 14.5 23.0 1993 6.68 1994 WATER 31. 56. 16. 817 1. 1, 6610 13, 22640 . 12, 65 14 3. 6.6 5.2 3.7 5.2 6.2 5.5 5.3 26 9.7 15 7.1 5.1 3.8 54 14 6.9 26 28 88 54 13 8.1 e32 32 25 11 7.2 6.3 12 5.2 5.3 532.4 17.2 88 3.7 8.1 1060 .50 .57 20.9 22.8 1993 17.2 1994 YEARS 1991 3 4 6 Jan 5 May 8 May Jan 23 Jan 90 27 7 6.2 38 13 7.2 6.0 11 7.0 4.9 4.0 3.8 26 7.0 4.1 3.1 3.0 2.8 57 52 18 220 79 74 92 125 86 39 19 36 20 102 1166.1 38.9 220 2.8 18 2310 1.12 1.25 37.6 53.7 1992 12,9 1991 - 1994 1993 1994 6 1992 9 1992 6 1993 6 1992 6 1992 e Estimated RIO GUANAJIBO BASIN 50133600 RIO GUANAJIBO NEAR SAN GERMAN, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°07'18", long 67°03'56", at bridge on Highway 347, 2.2 mi (3.5 km) northwest of San German. DRAINAGE AREA.--45.5 mi' (117.8 km'). PERIOD OF RECORD.—Water years 1979 to current year. WATER QUALITY DATA, WATER YEARS OCTOBER 19933 TO SEPTEMBER 1994 369 DATE OCT 1993 18. .. DEC 22. . . MAR 1994 04. . . APR 15. .. JUN 22. .. AUG 25. . . DATE OCT 1993 18. .. DEC 22... MAR 1994 04. . . APR 15. . . JUN 22... AUG 25. .. DATE OCT 1993 18. . . DEC 22. .. MAR 1994 04. .. APR 15. .. JUN 22. .. AUG 25... TIME 1415 0925 0755 1000 1115 1005 HARD- NESS TOTAL (MG/L AS CACO3) 200 -- -- -- -- 220 SILICA, DIS- SOLVED (MG/L AS SI02) 33 -- -- -- -- 32 DIS- CHARGE, INST. CUBIC FEET PER SECOND 50 -- 8.8 19 1.3 25 CALCIUM DIS- SOLVED (MG/L AS CA) 21 -- -- -- -- 26 SOLIDS , SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 259 -- -- -- -- 317 SPE- CIFIC CON- DUCT- ANCE (US/CM) 423 -- 650 600 695 470 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 35 -- — -- -- 37 SOLIDS, DIS- SOLVED (TONS PER DAY) 35.0 -- -- -- -- 21.0 PH WATER WHOLE FIELD (STAND- ARD UNITS) 8.0 -- 7.5 7.6 8.5 7.6 SODIUM, DIS- SOLVED (MG/L AS NA) 12 -- -- -- -- 30 RESIDUE TOTAL AT 105 DEC. C, SUS- PENDED (MG/L) 2 1 4 -- 1 18 TEMPER- ATURE WATER (DBG C) 28.0 -- 25.0 25.0 31.0 28.0 SODIUM AD- SORP- TION RATIO 0.4 — -- -- -- 0.9 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.30 0.90 0.90 -- 0.50 0.50 TUR- BID- ITY (NTU) 1.0 1.0 0.30 -- 0.90 5.2 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 1.9 -- -- -- -- 2.9 PHOS- PHORUS TOTAL (MG/L AS P) 0.160 1.00 1.10 -- 1.10 0.570 OXYGEN, DIS- SOLVED (MG/L) 4.6 -- 4.4 3.5 1.7 3.2 ALKA- LINITY WAT WH TOT FBT FIELD MG/L AS CACO3 210 -- 200 230 240 200 ARSENIC TOTAL (UG/L AS AS) <1 -- -- 1 -- -- OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 58 -- 53 41 22 40 SULFIDB TOTAL (MG/L AS S) <0.5 -- -- 1.4 -- " BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) 100 -- -- <100 -- -- OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) <10 17 <10 -- 48 12 SULFATB DIS- SOLVED (MG/L AS SO4) 15 -- -- -- -- 29 BORON, TOTAL RECOV- ERABLE (UG/L AS B) 50 -- -- 90 -- -- COLI- FORM, FECAL, 0.45 UM-MF (COLS./ 100 ML) 480 -- 400 K140 K10 2000 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 15 -- -- -- -- 40 CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- <1 -- -- STREP- TOCOCCI FECAL, (COLS. PER 100 ML) 220 -- 310 K260 K190 910 FLUO- RIDE, DIS- SOLVED (MG/L AS F) <0.10 -- -- -- -- 0.10 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) 7 -- -- 5 -- -- K = non-ideal count 370 RIO GUANAJIBO BASIN 50133600 RIO GOANAJIBO NEAR SAN GERMAN, PR- -Continued WATER QUALITY DATA, WATER YEARS OCTOBER 1993O SEPTEMBER 1994 COPPER, IRON, TOTAL TOTAL RECOV- RECOV- ERABLE BRABLB DATE (UG/L (0G/L LEAD, TOTAL RECOV- ERABLE (OG/L MANGA- NESE, TOTAL RECOV- ERABLE (OG/L MERCURY TOTAL RECOV- ERABLE (OG/L SELE- NIUM, TOTAL (OG/L SILVER, TOTAL RECOV- ERABLE (OG/L ZINC, TOTAL RBCOV- CYANIDE BRABLB TOTAL (OG/L (MG/L MBTHY- LENB BLOB ACTIVE PHENOLS SUB- TOTAL AS CO) AS FB) AS PB) AS MN) AS HG) AS SB) AS AG) AS ZN) AS CN) (OG/L) STANCE (MG/L) OCT 1993 18... DEC 22. .. MAR 1994 04. .. APR 15. .. JUN 22. . . AUG 25. . . 230 430 50 <0.10 80 <0.10 10 <0.010 <0.010 0.02 0.05 RIO GUANAJIBO BASIN 50136400 RIO ROSARIO NEAR HORMIGUEROS, PR LOCATION.--Lat 18°09'36", long 67°05'08", Hydrologic Unit 21010003 at bridge on Highway 348, 0.5 mi (0.8 km) southwest of Rosario plaza. 371 DRAINAGE AREA.--18.3 mi j (47.4 km j ). 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. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES NOV DEC JAN MAR APR JUN JUL AUG 1 93 43 2 123 47 3 146 61 4 171 42 5 140 38 6 207 38 7 223 37 8 172 36 9 129 36 10 126 43 11 94 38 12 78 37 13 71 36 14 67 36 15 69 36 16 93 36 17 91 38 18 66 35 19 59 34 20 55 36 21 52 36 22 48 35 23 46 34 24 75 33 25 51 33 26 74 33 27 100 32 28 76 32 29 76 40 30 56 42 31 46 TOTAL 2973 1133 MEAN 95.9 37.8 MAX 223 61 MIN 46 32 AC-FT 5900 2250 CFSM 5.24 2.06 IN. 6.04 2.30 STATISTICS OF MONTHLY MEAN MEAN 109 71.7 MAX 206 117 (WY) 1986 1990 MIN 33.2 16.1 (WY) 1992 1992 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN- DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE INSTANTANEOUS LOW PLOW ANNUAL RUNOFF (AC- FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 35 33 39 30 35 41 30 28 25 25 24 24 44 27 23 21 20 20 20 23 21 20 19 18 17 17 17 16 16 16 16 760 24.5 44 16 1510 1.34 1.54 DATA 29.5 43.2 1990 9.92 1992 FOR 16 16 15 14 14 13 14 14 16 18 15 16 15 15 15 16 15 14 14 14 14 15 19 16 16 15 15 15 15 15 15 469 15.1 19 13 930 .83 .95 FOR WATER 20.3 31.8 1990 15.1 1994 14 14 14 14 15 15 14 14 14 16 14 13 14 14 14 13 13 12 12 12 12 12 13 13 12 10 10 12 ___ ___ --- 369 13.2 16 10 732 .72 .75 YEARS 1986 16.7 30.2 1993 8.55 1992 16 25 14 12 11 11 11 11 10 10 9.7 16 39 16 13 13 12 11 11 10 10 9.9 9.7 9.7 9.6 28 18 11 20 25 12 444.6 14.3 39 9.6 882 .78 .90 - 1994 20.7 77.0 1989 10.1 1992 1993 CALENDAR YEAR 22488 61. 525 11 13 44600 3. 45. 141 40 16 6 May 30 Apr 23 Mar 16 37 71 10 14 26 15 11 11 17 17 12 11 12 12 11 11 21 39 61 55 45 28 19 15 13 12 11 10 68 57 24 17 --- 685 22.8 68 10 1360 1.25 1.39 14 13 13 13 13 13 48 31 17 15 32 20 13 47 45 257 89 38 e25 e21 e!8 20 17 16 15 14 14 14 15 15 17 952 30.7 257 13 1890 1.68 1.94 13 37 29 15 16 17 16 15 23 22 15 14 17 e!8 e20 49 37 19 13 12 11 10 11 10 10 e!4 elO e9.8 10 9.5 --- 522.3 17.4 49 9.5 1040 .95 1.06 9.3 9.9 47 67 38 116 83 38 23 20 17 16 15 15 17 20 16 15 15 15 17 17 17 19 18 18 17 18 17 20 19 809.2 26.1 116 9.3 1610 1.43 1.64 17 17 16 23 22 20 54 25 44 35 20 17 20 91 58 28 24 27 44 42 28 25 80 79 39 29 25 125 61 35 29 1199 38.7 125 16 2380 2.11 2.44 27 26 25 23 22 21 50 43 27 26 24 41 33 28 26 24 172 84 42 90 141 176 108 97 64 50 91 53 53 48 --- 1735 57.8 176 21 3440 3.16 3.53 , BY WATER YEAR (WY) 24.1 57.7 1989 11.9 1991 FOR 1994 12051. 33. 257 9, 10 2200 9, 23900 1, 24, 70 20 11 48.5 122 1993 15.8 1990 WATER YEAR ,1 ,0 May 16 .3 Jul 1 Mar 19 May 16 .02 May 16 .80 .50 46.5 91.1 1993 12.0 1992 43.2 75.2 1989 23.2 1990 WATER 48 70 30 1550 3 4 7480 13 3 35440 2 36 116 26 11 57.9 102 1989 25.1 1991 YEARS 1986 - .9 .6 .8 Oct 7 .9 May 9 .2 May 6 Aug 24 .64 Aug 24 .7 May 9 .67 .32 97.1 157 1993 32.7 1986 1994 1993 1992 1985 1992 1992 1988 1988 1992 e Estimated 372 RIO GOANAJIBO BASIN 50136400 RIO ROSARIO NEAR HORMIGUBROS, PR--Continued WATBR-QOALITY RECORDS PERIOD OP RECORD.--HATER YEARS 1979 TO CURRENT YEAR. PERIOD OP DAILY RECORD.-- SUSPENDED-SEDIMENT DISCHARGE: OCTOBER 1985 TO SEPTEMBER 1994 INSTRUMENTATION.--USD-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 POR PERIOD OP DAILY RECORD.-- SEDIMENT CONCENTRATIONSt Maximum daily mean, 8,150 mg/L October 7, 1985; Minimum daily mean, 1 mg/L January 28, 1990. SEDIMENT LOADS! Maximum daily, 74,700 tons (67,800 tonnes) October 7, 1985; Minimum daily, 0.05 ton (0.04 Tonne) several days. daily mean, 1,070 mg/L May 16, 1994; Minimum daily mean, 1.0 mg/L EXTREMES POR CURRENT YEAR 1994.-- SEDIMBNT CONCENTRATIONS< Maxil several days. SEDIMENT LOADS! Maximum daily, 3,680 tons (3,340 tonnes) May 16, 1994; Minimum daily 0.08 ton (0.06 tonne) December 12, 1993. HATER-QUALITY DATA, HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE OCT 1993 28... DEC 22... MAR 1994 03. .. APR 14. . . JUN 23. .. AUG 25. .. DATE OCT 1993 28. . . DEC 22. .. MAR 1994 03. .. APR 14. .. JUN 23. . . AUG 25. .. TIME 1400 1110 1330 0930 1110 1155 HARD- NESS TOTAL (M6/L AS CACO3 ) 110 -- -- 140 -- 120 DIS- CHARGE, INST. CUBIC PEBT PER SECOND 148 -- 14 10 11 36 CALCIUM DIS- SOLVED (MG/L AS CA) 22 -- -- 28 -- 22 SPE- CIFIC CON- DUCT- ANCE (US /CM) 240 -- 279 291 283 228 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 14 -- -- 17 -- 16 PH HATER WHOLE FIELD (STAND- ARD UNITS) 7.9 -- 8.0 8.1 8.2 8.1 SODIUM, DIS- SOLVED (MG/L AS NA) 6.7 -- -- 14 -- 6.2 TEMPER- ATURE HATER (DEG C) 26.0 -- 26.0 24.0 27.0 27.5 SODIUM AD- SORP- TION RATIO 0.3 -- -- 0.5 -- 0.2 TUR- BID- ITY (NTU) 4.7 0.90 0.90 1.1 1.1 2.8 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 1.7 -- -- 1.5 -- 1.3 OXYGEN, DIS- SOLVED (MG/L) 5.8 -- 10.0 8.8 7.5 5.0 ALKA- LINITY HAT HH TOT PET PI ELD MG/L AS CACO3 110 -- 130 140 130 120 OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 71 -- 122 102 92 62 SULPIDE TOTAL (MG/L AS S) <0.5 -- -- <0.5 -- -- OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) <10 <10 <10 <10 65 <10 SULPATE DIS- SOLVED (MG/L AS SO4) 6.6 -- -- 19 -- 8.0 COLI- PORM, FECAL, 0.45 UM-MF (COLS./ 100 ML) 440 -- 100 K120 K130 3500 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 6.0 -- -- 95 -- 8.2 STREP- TOCOCCI FECAL, (COLS. PER 100 ML) 610 -- 150 K110 K160 K1100 PLUO- RIDB, DIS- SOLVED (MG/L AS P) 0.10 -- -- 0.10 -- 0.10 K = non-ideal count RIO GUANAJIBO BASIN 50136400 RIO ROSARIO NEAR HORMIGUEROS, PR--Continued WATER QUALITY DATA, WATER YEARS OCTOBER 1993 TO SEPTEMBER 1994 373 DATE OCT 1993 28. . . DEC 22. . . MAR 1994 03... APR 14... JUN 23. . . AUG 25... DATE OCT 1993 28. . . DEC 22. .. MAR 1994 03. . . APR 14. . . JUN 23... AUG 25. . . SILICA, DIS- SOLVED (MG/L AS SI 02) 30 - — 27 - 30 COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 153 -- -- 286 -- 164 IRON, TOTAL RECOV- ERABLE (UG/L AS PE) SOLIDS, DIS- SOLVED (TONS PER DAY) 61.2 — -- 7.86 -- 15.8 LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) RESIDUE TOTAL AT 105 DEG. C, SUS- PENDED (MG/L) 7 1 8 4 3 13 MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) — <0.20 <0.20 - <0.20 <0.20 MERCURY TOTAL RECOV- ERABLE (UG/L AS HG) PHOS- PHORUS TOTAL (MG/L AS P) -- 0.040 0.060 -- 0.030 0.030 SELE- NIUM, TOTAL (UG/L AS SE) ARSENIC TOTAL (UG/L AS AS) <1 -- - <1 — — SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 -- -- <100 -- -- ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) BORON, TOTAL RECOV- ERABLE (UG/L AS B) 20 -- -- <20 -- -- CYANIDE TOTAL (MG/L AS CN) CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- <1 -- -- PHENOLS TOTAL (UG/L) CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) 3 -- -- 5 -- -- METHY- LENE BLUE ACTIVE SUB- STANCE (MG/L) 130 170 20 <0.10 <0.10 <0.010 <0.01 0.03 374 RIO GUANAJIBO BASIN 50136400 RIO ROSARIO NEAR HORMIGUEROS, PR-- Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 IAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN DISCHARGE (CPS) 93 123 146 171 140 207 223 172 129 126 94 78 71 67 69 93 91 66 59 55 52 48 46 75 51 74 100 76 76 56 46 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) OCTOBER 93 123 146 171 140 207 223 172 129 126 94 78 71 67 69 93 91 66 59 55 52 48 46 75 51 74 100 76 76 56 46 12 162 228 455 81 479 718 111 31 12 12 11 11 7 23 121 107 39 14 5 2 2 2 68 12 140 260 108 60 29 16 3.0 104 104 288 33 589 918 58 12 4.1 3.1 2.3 2.0 1.3 5.5 48 34 7.8 2.3 .76 .27 .25 .24 31 1.8 56 142 27 16 5.0 2.0 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CFS) (MQ/L) (TONS/DAY) NOVEMBER 43 47 61 42 38 38 37 36 36 43 38 37 36 36 36 36 38 35 34 36 36 35 34 33 33 33 32 32 40 42 11 26 53 19 10 12 14 7 6 21 7 5 5 5 5 5 8 11 7 5 4 5 4 3 3 3 3 8 23 24 1.2 7.2 14 2.2 1.0 1.2 1.3 .73 .58 3.5 .78 .55 .48 .52 .48 .48 .94 1.2 .71 .51 .45 .47 .36 .31 .26 .26 .26 .77 2.9 3.1 MEAN DISCHARGE (CPS) 35 33 39 30 35 41 30 28 25 25 24 24 44 27 23 21 20 20 20 23 21 20 19 18 17 17 17 16 16 16 16 MEAN CONCEN- TRATION (MO/L) DECEMBER 11 4 2 1 12 27 6 1 4 4 1 1 31 23 7 4 4 3 3 3 3 7 13 14 11 8 4 3 3 3 4 SEDIMENT DISCHARGE (TONS/ DAY) 1.1 .40 .23 .08 1.5 3.5 .51 .12 .28 .30 .09 .06 8.2 1.9 .48 .22 .21 .16 .16 .17 .20 .37 .64 .66 .51 .37 .20 .12 .12 .12 .17 TOTAL 2973 2501.72 1133 48.70 760 23.15 RIO GUANAJIBO BASIN 375 50136400 RIO ROSARIO NEAR HORMXQDEROS, PR— Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 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) (CPS) (MG/L) (TONS/DAY) JANUARY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 16 16 15 14 14 13 14 14 16 18 15 16 15 15 15 16 15 14 14 14 14 15 19 16 16 15 15 15 15 15 15 5 5 3 4 6 7 5 3 2 4 5 5 6 6 5 4 3 3 3 3 3 3 3 3 .22 .22 .15 .15 .21 .24 .20 .12 .13 .20 .22 .19 .16 .16 .19 .21 .18 .17 .20 .24 .24 .21 .19 .15 .12 .12 .12 .12 .12 .12 .12 FEBRUARY 14 14 14 14 15 15 14 14 14 16 14 13 14 14 14 13 13 12 12 12 12 12 13 13 12 10 10 12 2 2 2 3 4 7 10 9 5 3 3 3 4 5 5 5 5 4 4 5 5 4 4 5 7 8 8 e ___ ___ .10 .08 .09 .11 .16 .27 .38 .34 .19 .13 .12 .12 .17 .19 .18 .18 .18 .15 .14 .17 .17 .14 .13 .17 .21 .24 .24 .28 ___ MARCH 16 25 14 12 11 11 11 11 10 10 9.7 16 39 16 13 13 12 11 11 10 10 9.9 9.7 9.7 9.6 28 ie 11 20 25 12 8 9 4 3 3 4 5 5 4 5 6 11 26 10 5 4 4 4 5 4 4 3 3 4 5 63 20 17 21 57 27 .45 .74 .18 .11 .10 .13 .14 .14 .12 .13 .17 1.2 4.4 .42 .20 .13 .12 .13 .14 .12 .10 .09 .09 .12 .13 18 1.0 .51 2.1 4.5 .87 TOTAL 469 5.39 369 5.03 444.6 36.78 376 RIO GUANAJIBO BASIN 50136400 RIO ROSARIO NEAR HORMIGUEROS, PR-- Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DAY (CPS) (MG/L) (TONS/DAY) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 10 14 26 15 11 11 17 17 12 11 12 12 11 11 21 39 61 55 45 28 19 15 13 12 11 10 68 57 24 17 ___ APRIL 19 18 30 27 19 15 14 11 10 10 11 10 6 5 9 23 128 55 97 38 16 11 10 8 8 6 274 46 16 11 ___ .58 .73 2.3 1.1 .57 .43 .77 .57 .31 .31 .35 .31 .19 .16 .99 3.4 71 19 14 3.1 .81 .42 .33 .27 .23 .18 256 11 1.1 .51 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CPS) (MG/L) (TONS/DAY) MAY 14 13 13 13 13 13 48 31 17 15 32 20 13 47 45 258 89 38 e25 e21 eie 20 17 16 15 14 14 14 15 15 17 9 8 9 11 13 12 64 23 10 10 24 24 18 94 31 1070 107 22 6 5 5 5 5 6 8 8 7 5 5 5 5 .34 .28 .30 .37 .46 .44 28 2.8 .46 .43 4.4 1.4 .65 68 6.3 3680 35 2.7 e.52 e.35 e.27 .25 .23 .27 .31 .30 .26 .21 .20 .21 .20 TOTAL 685 391.02 953 3835.91 MEAN DISCHARGE (CPS) 13 37 29 15 16 17 16 15 23 22 15 14 17 e!8 e20 49 37 19 13 12 11 10 11 10 10 e!4 elO e9.8 10 9.5 522.3 MEAN CONCEN- SEDIMENT TRATION DISCHARGE (MG/L) (TONS/DAY) JUNE 5 35 13 5 5 5 5 5 10 13 9 8 8 8 12 78 24 12 12 10 9 12 16 18 18 16 13 13 12 11 .17 12 1.3 .21 .20 .22 .22 .21 .91 .86 .37 .33 .37 e.32 e.98 53 4.4 .57 .39 .31 .26 .32 .43 .48 .51 e.59 e.32 e.35 .33 .27 81.20 e Estimated RIO GUANAJIBO BASIN 50136400 RIO ROSARIO NEAR HORMXOUBROS, PR-- Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 MEAN MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE (CPS) (MG/L) (TONS/DAY) AUGUST 377 DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 TOTAL YEAR MEAN DISCHARGE (CFS) 9.3 9.9 47 67 38 116 83 38 23 20 17 16 15 15 17 20 16 15 15 15 17 17 17 19 18 18 17 18 17 20 19 809.2 12052.1 MEAN CONCEN- TRATION (MG/L) JULY 10 10 67 89 22 632 71 20 20 19 17 16 15 17 18 17 13 10 6 7 11 10 10 10 10 9 8 11 12 12 12 —— SEDIMENT DISCHARGE (TONS/DAY) .26 .28 33 40 2.8 986 21 1.8 1.3 .95 .76 .67 .62 .66 .94 .92 .56 .38 .25 .29 .47 .46 .45 .52 .50 .42 .39 .52 .59 .62 .65 1099.03 11442.78 17 17 16 23 22 20 54 25 44 35 20 17 20 91 58 28 24 27 44 42 28 25 80 79 39 29 25 125 61 35 29 12 12 12 17 17 9 50 10 53 19 11 10 10 561 45 15 10 12 41 62 45 34 316 75 20 15 13 513 46 16 11 .54 .52 .48 1.3 1.2 .45 17 .86 12 1.8 .61 .46 .54 444 9.4 1.2 .62 .96 11 8.0 3.5 2.3 240 22 2.2 1.2 .88 675 9.2 1.5 .81 MEAN DISCHARGE (CPS) MEAN CONCEN- TRATION (MG/L) SEDIMENT DISCHARGE (TONS/DAY) SEPTEMBER 27 26 25 23 22 21 50 43 27 26 24 41 33 28 26 24 172 84 42 90 141 176 108 97 64 50 91 53 53 48 10 10 11 21 29 27 75 28 11 11 10 28 22 12 11 11 567 85 23 96 282 310 128 112 41 20 118 36 40 31 .69 .68 .69 1.2 1.7 1.5 33 5.2 .83 .72 .64 5.6 1.9 .87 .77 .73 1240 26 2.8 29 216 183 43 38 7.8 2.8 78 6.1 9.0 5.1 1199 1471.53 1735 1943.32 378 RIO GUANAJIBO BASIN 50136400 RIO ROSARIO NEAR HORMIGUEROS, PR—Continued HATER QUALITY DATA, HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT DATE OCT 1993 07... 07... APR 1994 27. .. MAY 16. .. JUL 06. .. AUG 28... 28... SEP 17... DATE OCT 1993 07... 07... APR 1994 27. .. MAY 16. .. JUL 06. .. AUG 28... 28. .. SEP 17... TIME 1819 1920 1553 1814 1915 1638 1709 1630 SED. SUSP. FALL DIAM. PERCENT FINER THAN .016 MM 57 47 47 80 €2 4€ €3 38 DIS- CHARGE, INST. CUBIC FEET PER SECOND 219 €00 9.7 819 1040 €79 €99 725 SED. SUSP. FALL DIAM. PERCENT FINER THAN .031 MM €7 56 56 84 73 56 74 47 SEDI- MENT, SUS- PENDED (MG/L) 3105 €000 €500 5450 7050 4580 4740 5770 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .062 MM 78 €5 €3 93 82 €9 86 57 SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) 1840 9720 170 12100 20400 8390 €940 11280 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .125 MM 91 74 73 98 94 86 96 79 SED. SUSP. FALL DIAM. PERCENT FINER THAN .002 MM 37 24 20 38 27 22 35 18 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .250 MM 98 82 77 99. € 99 95 99 93 SED. SUSP. FALL DIAM. PERCENT FINER THAN .004 MM 43 32 29 49 37 29 44 24 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .500 MM 99. € 92 83 99.8 99. € 98 99 97 SED. SUSP. FALL DIAM. PERCENT FINER THAN .008 MM 48 38 37 €1 49 36 44 30 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN 1.00 MM 99.8 99 92 100 99.7 99 100 99 RIO GUANAJIBO BASIN 50136400 RIO ROSARIO NEAR HORMIGUEROS , PR—Continued WATER QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 SILT AND CLAY PERCENT OF SUSPENDED SEDIMENT 379 DATE OCT 1993 04... 06.. . APR 1994 17.. . MAY 16... 16... JU!u 06... AU6 13... 16... SEP 21... TIME 1810 1547 1613 1530 1558 2015 1700 1900 1734 STREAM- FLOW, INSTAN- TANEOUS (CFS) 240 497 262 367 818 502 26 254 340 SEDI- MENT, SUS- PENDED (MG/L) 1310 1630 1600 5620 6980 5190 364 2700 1020 SEDI- MENT, DIS- CHARGE, SUS- PENDED (T/DAY) 849 2190 1130 5570 15420 7030 26 1850 3690 SED. SUSP. SIEVE DIAM. PERCENT FINER THAN .062 MM 41 89 92 82 85 90 98 77 77 380 RIO GUANAJIBO BASIN 50138000 RIO GUANAJIBO NEAR HORMIGUBROS, 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 mi (3.2 km) downstream from Rio Rosario. DRAINAGE ARBA.--120 mi 1 (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. Daily discharges affected by sewage treatment plant about 2.1 mi (3.4 km) upstream from gage. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY NOV DEC JAN FEB APR MAY JUN AUG SEP 1 316 109 2 295 107 3 395 130 4 422 111 5 322 101 6 361 99 7 385 97 8 530 101 9 252 97 10 193 123 11 163 126 12 143 107 13 128 96 14 116 93 15 108 89 16 144 111 17 205 110 18 119 105 19 97 94 20 92 e95 21 103 elOO 22 100 elOO 23 89 e!05 24 116 ellO 25 106 e!05 26 113 e86 27 146 e67 28 259 e75 29 221 e!28 30 146 127 31 117 --- TOTAL 6302 3104 MEAN 203 103 MAX 530 130 MIN 89 67 AC-FT 12500 6160 CFSM 1.69 .86 IN. 1.95 .96 STATISTICS OF MONTHLY MEAN MEAN 489 424 MAX 1254 1518 (WY) 1986 1978 MIN 97.5 42.7 (WY) 1992 1992 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN- DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE INSTANTANEOUS LOW FLOW ANNUAL RUNOFF (AC-FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 87 72 69 65 66 89 68 64 62 60 55 56 66 93 69 56 52 53 48 62 62 47 46 43 41 41 40 40 38 37 37 1784 57.5 93 37 3540 .48 .55 DATA 128 422 1976 15.4 1992 FOR 36 37 35 34 34 33 31 52 37 39 36 37 34 32 30 31 29 29 29 25 24 25 53 70 41 32 29 32 37 47 32 1102 35.5 70 24 2190 .30 .34 FOR WATER 58.2 110 1993 13.8 1973 28 26 25 25 26 26 24 24 23 22 21 20 20 19 21 20 19 17 18 19 18 18 17 19 18 18 18 20 ___ ___ --- 589 21.0 28 17 1170 .18 .18 YEARS 1973 46.0 96.1 1993 13.9 1977 44 55 42 30 27 27 26 25 23 21 21 22 146 45 29 25 22 19 18 16 16 16 15 15 15 14 37 18 20 40 21 910 29.4 146 14 1800 .24 .28 - 1994 44.2 244 1989 10.6 1977 1993 CALENDAR YEAR 53263 146 1230 26 29 105600 1. 16. 325 92 40 Sep 28 Mar 23 Mar 20 22 51 18 38 83 42 41 87 100 148 50 57 98 95 50 40 57 122 89 86 106 64 45 36 30 26 24 23 83 247 69 45 --- 2099 70.0 247 18 4160 .58 .65 34 28 25 23 22 29 34 67 26 22 34 48 24 21 88 235 241 66 44 35 30 27 24 22 20 18 17 16 18 18 18 1374 44.3 241 16 2730 .37 .43 16 25 63 28 20 17 15 15 17 27 16 14 14 15 16 28 74 26 22 21 22 21 13 13 15 19 21 39 28 21 --- 701 23.4 74 13 1390 .19 .22 20 24 49 107 119 126 183 62 40 30 25 23 21 19 18 27 21 19 20 18 20 20 17 16 19 35 22 20 19 19 23 1201 38.7 183 16 2380 .32 .37 21 18 16 16 29 25 62 61 56 65 32 25 26 157 137 51 54 76 158 185 103 65 79 158 87 62 50 146 127 63 50 2260 72.9 185 16 4480 .61 .70 45 69 49 40 37 40 71 134 52 43 45 55 62 40 36 33 301 275 96 345 283 480 343 216 164 123 125 117 126 146 --- 3991 133 480 33 7920 1.11 1.24 , BY WATER YEAR (WY) 70.9 316 1989 16.1 1977 FOR 1994 25417 69. 530 13 15 1240 17. 50410 . 7. 145 40 18 178 636 1980 12.7 1977 WATER YEAR 6 Oct 8 Jun 23 Mar 20 Oct 7 64 Oct 7 58 88 110 504 1979 9.23 1977 103 240 1984 26.4 1976 WATER 199 402 69 35000 5 5 128000 28 4 144200 1 22 438 75 20 222 757 1988 42.3 1976 YEARS 1973 - .6 Sep 16 . 0 Jun 18 .5 Jun 17 Sep 16 .50 Sep 16 .6 Jun 22 .66 .54 486 2075 1975 95.4 1991 1994 1979 1994 1975 1977 1977 1975 1975 1977 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 1993 TO SEPTEMBER 1994 381 DATE OCT 1993 19. .. DEC 23... MAR 1994 03... APR 15. .. JDN 23... AUG 26... DATE OCT 1993 19. .. DEC 23. .. MAR 1994 03. .. APR 15. .. JDN 23. . . AUG 26. .. DATE OCT 1993 19. . . DEC 23. . . MAR 1994 03. . . APR 15. .. JDN 23. . . AUG 26. . . TIME 1145 0755 1030 0835 0905 0905 HARD- NESS TOTAL (MG/L AS CACO3 ) 200 -- -- 170 -- 180 SILICA, DIS- SOLVED (MG/L AS SI02) 30 -- — 31 -- 33 DIS- CHARGE, INST. CUBIC FEET PER SECOND 105 -- 45 44 13 69 CALCIUM DIS- SOLVED (MG/L AS CA) 29 -- -- 26 -- 29 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 233 -- -- 205 -- 242 SPE- CIFIC CON- DUCT- ANCE (US/CM) 380 -- 428 474 367 399 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 30 -- — 21 -- 27 SOLIDS, DIS- SOLVED (TONS PER DAY) 65.9 -- -- 24.4 -- 45.1 PH WATER WHOLE FIELD (STAND- ARD UNITS) 7.9 -- 7.4 7.7 7.7 7.5 SODIUM, DIS- SOLVED (MG/L AS NA) 10 -- -- 11 -- 14 RESIDUE TOTAL AT 105 DBG. C, SUS- PENDED (MG/L) 14 9 11 1 9 16 TEMPER- ATURE WATER (DBG C) 25.0 — 24.0 24.0 27.0 27.5 SODIUM AD- SORP- TION RATIO 0.3 -- -- 0.2 -- 0.4 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.20 0.30 0.30 0.40 <0.20 0.80 TUR- BID- ITY (NTU) 2.6 2.0 2.0 -- 2.8 1.5 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 1.6 -- -- 1. -- 2.9 PHOS- PHORUS TOTAL (MG/L AS P) 0.110 0.330 0.360 0.290 0.110 0.550 OXYGEN, DIS- SOLVED (MG/L) 4.0 — 7.6 3.4 2.9 4.4 ALKA- LINITY WAT WH TOT FET FIELD MG/L AS CACO3 180 -- 170 200 160 160 ARSENIC TOTAL (UG/L AS AS) <1 -- -- <1 -- -- OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 47 -- 90 40 36 55 SULFIDE TOTAL (MG/L AS S) <0.5 -- -- <0.5 -- " BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) 100 -- -- <100 -- -- OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) <10 14 <10 — 13 10 SULFATE DIS- SOLVED (MG/L AS SO4) 13 -- -- 15 -- 22 BORON, TOTAL RECOV- ERABLE (UG/L AS B) 40 -- -- 50 -- -- COLI- FORM, FECAL, 0.45 DM-MF (COLS./ 100 ML) 390 -- 210 K600 220 2700 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 11 -- -- 9 -- 18 CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- <1 -- -- STREP- TOCOCCI FECAL, (COLS. PER 100 ML) 300 -- 220 5300 710 1600 FLUO- RIDB, DIS- SOLVED (MG/L AS F) <0.10 -- -- <0.10 -- 0.10 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) 6 -- -- 6 -- -- K = non-ideal count 382 RIO GUANAJIBO BASIN 50138000 RIO GOANAJIBO NEAR HORMIGUBROS, PR- -Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE OCT 1993 19. .. DEC 23... MAR 1994 03... APR 15. .. JUN 23... AUG 26... COPPER, TOTAL RECOV- ERABLE (UG/L IRON, TOTAL RECOV- ERABLE (UG/L LEAD, TOTAL RECOV- ERABLE (UG/L MANGA- NESE, TOTAL RECOV- ERABLE (UG/L MERCURY TOTAL RECOV- ERABLE (UG/L SELE- NIUM, TOTAL (UG/L SILVER, TOTAL RECOV- ERABLE (UG/L ZINC, TOTAL RECOV- ERABLE (UG/L CYANIDE TOTAL (MG/L PHENOLS TOTAL METHY- LBNB BLUB ACTIVE SUB- STANCE AS CU) AS PB) AS PB) AS MN) AS HG) AS SB) AS AG) AS ZN) AS CN) (UG/L) 560 <1 60 <0.10 700 70 <0.10 <0.010 <0.010 (MG/L) <0.02 0.03 PESTICIDE ANALYSES DATE JUN 1994 23.. . PCB, TIME TOTAL (DG/L) 0905 ALDRIN, TOTAL (UG/L) 1.010 CHLOR- DANE, TOTAL (UG/L) ODD, TOTAL (OG/L) DDE, TOTAL (OG/L) DDT, TOTAL (UG/L) DI- AZINON, TOTAL (UG/L) DI- ENDO- ELDRIN SULPAN, TOTAL TOTAL (UG/L) (UG/L) <0.010 <0.010 <0.010 <0.01 <0.010 <0.010 ENDRIN WATER UNPLTRD BTHION, DATE REC TOTAL (UG/L) (UG/L) JUN 1994 23.. . HEPTA- HBPTA- CHLOR CHLOR, BPOXIDB LINDANE TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) <0.010 <0.01 <0.010 <0.010 <0.010 MALA- THION, TOTAL (UG/L) <0.01 MBTH- OXY- CHLOR, TOTAL (UG/L) <0.01 METHYL PARA- THION, MIRBX, TOTAL TOTAL (UG/L) (UG/L) <0.01 <0.01 DATE JUN 1994 23.. . PARA- THION, TOTAL (UG/L) NAPH- THA- LENES, POLY- CHLOR. TOTAL (UG/L) PBR- THANE TOTAL (UG/L) TOX- APHBNB, TOTAL (UG/L) TOTAL TRI- THION (UG/L) 2,4-D, TOTAL (UG/L) 2,4,5-T TOTAL (UG/L) 2, 4-DP TOTAL (UG/L) SILVEX, TOTAL (UG/L) <0.01 <0.10 <0.01 <0.01 <0.01 <0.01 <0.01 EXPLANATION A 144° SURFACE-WATER STATION AND NUMBER T 1388 QUALITY-OF-WATER STATION AND NUMBER • 1415 LAKE-ELEVATION STATION 01 23456 KILOMETERS ' ...1....L-.^..J__1— 01 234 MILES Figure 26.--Rio Yagiiez and Rio Grande de Anasco basins. Co Qo Co 384 RIO YAGOEZ BASIN ' 50138800 RIO YAGOEZ NEAR MAYAGUBZ, PR HATER-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 mi' (17.3 km1 ). PERIOD OF RECORD.—Hater years 1979 to current year. HATER-QUALITY DATA, HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE OCT 1993 19... DEC 22... MAR 1994 03... APR 14. .. JUN 23. .. AUG 26. .. DATE OCT 1993 19. .. DEC 22. .. MAR 1994 03. .. APR 14. .. JUN 23. .. A0G 26... TIME 0900 1245 0730 1125 1320 0720 HARD- NESS TOTAL (MG/L AS CACO3 ) 130 -- — 100 -- 120 SILICA, DATE OCT 1993 19. .. DEC 22. .. MAR 1994 03. .. APR 14. .. JUN 23... AUG 26... K = non-ideal DIS- SOLVED (MG/L AS SI02) 31 — -- 29 — 32 count DIS- CHARGE, INST. CUBIC FEET PER SECOND 13 -- 2.7 1.8 1.5 5.4 CALCIUM DIS- SOLVED (MG/L AS CA) 34 -- -- 30 -- 33 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 176 -- -- 231 -- 185 SPE- CIFIC CON- DUCT- ANCE (US/CM) 263 — 324 325 318 286 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 12 — — 16 — 10 SOLIDS, DIS- SOLVED (TONS PER DAY) 6.16 -- -- 1.16 -- 2.69 PH HATER WHOLE FIELD (STAND- ARD UNITS) 8.1 -- 7.5 7.9 8.0 7.6 SODIUM, DIS- SOLVED (MG/L AS NA) 9.7 -- -- 9.1 -- 11 RESIDUE TOTAL AT 105 DEC. C, SUS- PENDED (MG/L) 4 4 27 11 3 9 TEMPER- ATURE HATER (DEC C) 22.5 — 21.0 25.0 27.5 24.0 SODIUM AD- SORP- TION RATIO 0.4 — — 0.5 — 0.4 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) <0.20 <0.20 0.20 0.20 <0.20 <0.20 TUR- BID- ITY (NTU) 2.5 1.0 15 -- 1.0 2.3 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 1.9 -- -- 2.6 — 2.3 PHOS- PHORUS TOTAL (MG/L AS P) 0.050 0.080 0.110 0.060 0.050 0.040 OXYGEN, DIS- SOLVED (MG/L) 4.7 — 8.0 5.4 7.3 4.8 ALKA- LINITY HAT HH TOT FET FIELD MG/L AS CAC03 120 — 140 150 140 130 ARSENIC TOTAL (UG/L AS AS) <1 -- — <1 — — OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 53 -- 112 64 91 56 SULFIDE TOTAL (MG/L AS S) 0.6 __ -- <0.5 -- -- BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) 100 -- -- <100 -- -- OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) <10 <10 <10 — <10 11 SULFATE DIS- SOLVED (MG/L AS S04) 7.0 — — 8.2 — 8.8 BORON, TOTAL RECOV- ERABLE (UG/L AS B) 20 -- -- 40 -- -- COLI- FORM, FECAL, 0.45 UM-MF (COLS./ 100 ML) 4400 -- 300 300 270 1700 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 8.0 __ -- 7.9 -- 9.9 CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 __ -- <1 -- -- STREP- TOCOCCI FECAL, (COLS. PER 100 ML) 2500 -- 2300 410 660 2300 FLUO- RIDE, DIS- SOLVED (MG/L AS F) <0.10 — — 0.20 -- 0.10 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) <1 -- -- <1 — -- RIO YAG0BZ BASIN 50138800 RIO YAGDBZ NEAR MAYAGDBZ, PR--Continued WATBR-QOALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 385 DATE OCT 1993 19. .. DEC 22... MAR 1994 03. .. APR 14... JUN 23. .. ADG 26... COPPER, TOTAL RECOV- ERABLE (DG/L AS CD) <10 — — <10 — — IRON, TOTAL RECOV- ERABLE (DG/L AS PB) 210 -- -- 110 -- -- LEAD, TOTAL RECOV- ERABLE (DG/L AS PB) 6 — -- <1 -- -- MANGA- NESE, TOTAL RECOV- ERABLE (DG/L AS MN) 10 -- -- 20 -- -- MERCURY TOTAL RECOV- ERABLE (DG/L AS HG) <0.10 — — <0.10 — -- SELE- NIUM, TOTAL (DG/L AS SB) <1 -- -- <1 -- -- SILVER, TOTAL RECOV- ERABLE (DG/L AS AG) <1 — — <1 — — ZINC, TOTAL RECOV- ERABLE (DG/L AS ZN) <10 -- -- <10 -- -- CYANIDE TOTAL PHENOLS (MG/L TOTAL AS CN) (DG/L) <0.010 <1 __ — <0.010 <1 __ __ MBTHY- LENB BLUB ACTIVE SUB- STANCE (MG/L) <0.02 -- -- <0.02 -- -- 386 RIO GRANDE DE ANASCO BASIN 50141500 LAGO GDAYO NEAR CASTANBR, 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 Castafter, and 6.0 mi (9.6 km) west of Adjuntas. DRAINAGE AREA.--9.60 mi» (24.86 km 3 ). ELEVATION RECORDS PERIOD OF RECORD.--April 1980 to January 1985, June 1989 to current year. GAGE.--Hater-stage recorder. Datum of gage is mean sea level. REMARKS.--Lago Guayo was completed in 1956. The dam is on Rio Guayo and is the largest in the southwestern Puerto Rico project. The maximum storage is 17,400 ac-ft (21.5 hm3 ) for power and irrigation. The dam is a concrete gravity structure with a total length of 555 ft (169 m), a maximum structural height of 190 ft (58 m), and a maximum width at the base of 145 ft (44 m) . The ungated overflow spillway with a crest elevation of 60.00 ft (18.29 m) and a crest length of 220 ft (67 m) was designed to pass a maximum flood of 30,200 ftVs (855 m'/s) at a reservoir elevation of 70.00 ft (21.34 m). Timber flashboards that were added to increase storage capacity were subsequently removed and their use discontinued. Gage-height and precipitation satellite telemetry at station. EXTREMES OBSERVED FOR PERIOD OF RECORD.--Maximum elevation, 1462.43 ft (445.75 m), May 27, 1980; minimum elevation recorded, 1415.43 ft (431.42 m), June 2, 1990, but may have been less during period of no gage-height record June 2-5, 1990. EXTREMES OBSERVED FOR CURRENT YEAR.--Maximum elevation, 1458.73 ft (444.62 m), Dec.3; minimum elevation recorded 1419.28 ft (432.96 m), May 28. Capacity Table (based on data from Puerto Rico Hater Resources Authority) Elevation, in feet 1415 1449 Contents, in acre-feet 3,960 10,660 Elevation, in feet 1460 1465 Contents, in acre-feet 13,550 15,000 ELEVATION (FEET NGVD), HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY OBSERVATION AT 24:00 VALUES OCT NOV DEC JAN FEB MAR APR MAY JUN AUG SEP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN MAX MIN 1452.82 1453.63 1454.32 1454.92 1455.04 1455.36 1455.77 1456.34 1456.74 1456.89 A A A A 1456.03 1456.60 1457.30 1457.78 1457.66 1457.44 1457.34 1457.11 1457.52 1457.93 1456.96 1455.81 1455.79 1455.86 1455.17 1455.59 1455.98 1456.14 1457.93 1452.82 1455.65 1455.60 1455.56 1455.89 1456.28 1454.99 1454.84 1454.81 1455.09 1455.42 1455.72 1455.99 1455.99 1455.98 1455.60 1455.97 1456.32 1456.42 1456.62 1456.89 1457.14 1457.33 1457.56 1457.80 1458.03 1458.30 1457.21 1457.66 1457.87 1458.15 --- 1456.42 1458.30 1454.81 1458 1458 1458 1457 1458 1458 1458 1457 1457 1457 1457 1457 1457 1457 1457 1457 1457 1457 1456 1456 1456 1456 1456 1456 1456 1456 1456 1457 1457 1457 1457 1457 1458 1456 .39 .61 .22 .96 .23 .14 .13 .73 .60 .38 .15 .36 .30 .97 .78 .35 .14 .21 .93 .70 .29 .01 .21 .41 .60 .79 .98 .15 .33 .47 .39 .35 .61 .01 1457.54 1457.71 1457.89 1458.03 1457.43 1457.57 1457.11 1456.90 1456.90 1456.66 1456.31 1455.56 1455.61 1454.92 1453.33 1453.49 1453.44 1453.60 1453.11 1453.25 1453.39 1452.74 1453.13 1453.33 1453.42 1453.54 1453.67 1453.83 1452.76 1452.88 1453.02 1454.91 1458.03 1452.74 1452. 1452. 1453. 1453. 1453. 1453. 1453. 1453. 1453. 1453. 1454. 1454. 1454. 1454. 1454. 1454. 1454. 1453. 1454. 1454. 1454. 1453. 1453. 1452. 1451. 1451. 1450. 1450.- - - 1453. 1454. 1450. 96 92 04 17 31 45 60 71 84 96 07 19 28 00 09 20 14 90 00 10 03 79 35 76 66 27 92 03 -- -- -- 31 28 03 1449 1449 1448 1448 1448 1448 1447 1445 1444 1444 1443 1442 1442 1442 1442 1441 1440 1440 1440 1440 1439 1439 1439 1439 1439 1439 1439 1439 1439 1439 1438 1442 1449 1438 .48 .48 .51 .10 .24 .36 .14 .75 .67 .50 .79 .84 .40 .63 .26 .32 .45 .21 .13 .24 .09 .16 .28 .40 .52 .63 .77 .83 .22 .06 .54 .68 .48 .54 1438. 1439. 1439. 1439. 1439. 1440. 1440. 1440. 1440. 1440. 1440. 1440. 1440. 1439. 1439. 1439. 1440. 1440. 1439. 1438. 1437. 1436. 1435. 1433. 1432. 1432. 1432. 1431. 1431. 1429.- 1437. 1440. 1429. 81 30 55 79 95 10 26 49 65 81 26 42 18 58 42 83 24 07 81 31 37 46 84 81 58 16 37 85 97 05 -- 71 81 05 1429.14 1429.27 1429.42 1429.54 1429.67 1429.83 1429.95 1430.07 1430.19 1430.21 1430.27 1430.58 1430.68 1426.72 1423.97 1424.04 1424.04 1424.04 1424.07 1424.07 1424.07 1423.23 A A A 1420.76 1419.32 1419.57 1419.77 1419.91 1420.03 1425.94 1430.68 1419.32 1420.14 1420.57 1421.39 1421.63 1421.80 1421.94 1422.06 1422.18 1422.30 1422.41 1422.54 1422.68 1422.76 1422.88 1423.58 1423.96 1424.18 1423.75 1423.90 1424.01 1423.16 1423.27 1423.19 1423.31 1423.51 1423.82 1423.98 1424.16 1424.29 1424.43 --- 1422.93 1424.43 1420.14 1424. 1424. 1424. 1425. 1425. 1425. 1426. 1427. 1427. 1427. 1427. 1427. 1428. 1428. 1428. 1428. 1428. 1428. 1428. 1428. 1428. 1428. 1428. 1429. 1429. 1429. 1429. 1429. 1429. 1429. 1429. 1427. 1429. 1424. 55 70 86 03 18 50 18 30 49 66 77 89 00 08 17 33 42 54 65 74 83 91 98 07 16 25 33 39 45 73 94 84 94 55 1430.05 1430.12 1430.10 1430.15 1430.27 1430.47 1430.73 1430.81 1431.15 1431.34 1431.46 1431.35 1431.43 1432.01 1430.25 1429.10 1428.63 1428.42 1429.41 1429.89 1430.11 1429.98 1430.71 1431.43 1432.08 1433.30 1433.73 1434.06 1434.44 1433.98 1434.15 1431.13 1434.44 1428.42 1433.92 1433.48 1433.67 1433.83 1433.97 1434.08 1434.27 1434.41 1432.50 1430.68 1430.13 1428.62 1428.79 1428.90 1428.99 1429.07 1429.50 1429.69 1429.20 1429.21 1429.52 1429.90 1430.38 1432.85 1433.38 1433.86 1434.17 1434.40 1434.46 1434.35 --- 1431.81 1434.46 1428.62 A No gage-height record RIO GRANDE DE ANASCO BASIN 387 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 km 3 ) this does not include 36.2 mi> (93.8 km 3 ) which contributes only dur- ing high floods, and 3.5 mi 3 (9.1 km') 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 1993 TO SEPTEMBER 1994 DATE OCT 1993 19. .. DEC 09. .. FEE 1994 10. .. APR 19. . . JUN 27. . . AUG 23. . . DATE OCT 1993 19. .. DEC 09. .. FEB 1994 10. . . APR 19. . . JUN 27. . . AUG 23. . . DATE OCT 1993 19. . . DEC 09. .. FEB 1994 10. . . APR 19. . . JUN 27. . . AUG 23. . . TIME 1010 0910 1105 0850 1145 1115 HARD- NESS TOTAL (MG/L AS CACO3) 120 -- -- 110 -- 120 SILICA, DIS- SOLVED (HG/L AS SI02) 33 -- -- 27 -- 31 DIS- CHARGE, INST. CUBIC FEET PER SECOND 41 32 23 29 15 18 CALCIUM DIS- SOLVED (MG/L AS CA) 33 -- -- 29 -- 33 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 192 -- -- 165 -- 186 SPE- CIFIC CON- DUCT- ANCE (US/CM) 265 308 317 239 291 291 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 9.6 — -- 8.8 -- 9.3 SOLIDS, DIS- SOLVED (TONS PER DAY) 21.3 -- -- 12.8 -- 8.91 PH WATER WHOLE FIELD (STAND- ARD UNITS) 8.1 7.9 7.9 7.6 8.4 7.7 SODIUM, DIS- SOLVED (MG/L AS NA) 12 -- -- 11 -- 12 RESIDUE TOTAL AT 105 DEG. C, SUS- PENDED (MG/L) 9 6 6 50 4 10 TEMPER- ATURE WATER (DEG C) 24.0 21.0 23.0 23.0 28.0 28.0 SODIUM AD- SORP- TION RATIO 0.5 -- -- 0.5 -- 0.5 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.20 <0.20 0.40 0.30 <0.20 <0.20 TUR- BID- ITY (NTU) 0.80 2.8 1.0 44 2.1 5.5 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 1.6 -- -- 2.0 -- 2.2 PHOS- PHORUS TOTAL (MG/L AS P) 0.030 0.030 0.040 0.020 0.050 0.040 OXYGEN, DIS- SOLVED (MG/L) 6.6 5.8 3.5 8.6 10.8 9.4 ALKA- LINITY WAT WH TOT FBT FIELD MG/L AS CACO3 120 120 120 94 110 110 ARSENIC TOTAL (UG/L AS AS) <1 -- -- <1 -- -- OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 78 64 40 100 140 106 SULFIDE TOTAL (MG/L AS S) <0.5 -- -- <0.5 -- " BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 -- -- <100 -- -- OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) <10 <10 <10 17 11 14 SULFATE DIS- SOLVED (MG/L AS S04) 21 -- -- 21 -- 23 BORON, TOTAL RECOV- ERABLE (UG/L AS B) <10 -- -- 20 -- -- COLI- FORM, FECAL, 0.45 UM-MF (COLS./ 100 ML) K780 K160 30 4500 K8900 200 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 10 -- -- 10 -- 9.9 CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- <1 -- -- STREP- TOCOCCI FECAL, (COLS. PER 100 ML) K1800 490 30 K11000 200 230 FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.20 -- -- <0.10 -- <0.10 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) <1 -- -- <1 -- -- K = non-ideal count 388 RIO GRANDS DE ANASCO BASIN 50143000 RIO GRANDE DE ANASCO NEAR LARES, PR—Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 COPPER, IRON, TOTAL TOTAL RBCOV- RECOV- ERABLE BRABLE DATE OCT 1993 19. .. 19. .. DEC 09. .. FBB 1994 10. .. APR 19. .. JUN 27. .. AUG 23. .. (D6/L (D6/L LEAD, TOTAL RECOV- ERABLE (UG/L MANGA- NESE, MERCURY TOTAL TOTAL RECOV- ERABLE RECOV- ERABLE (DG/L (UG/L SELE- NIUM, TOTAL (UG/L SILVER, TOTAL RECOV- ERABLE (UG/L ZINC, TOTAL RECOV- CYANIDE BRABLE TOTAL (UG/L (MG/L MBTHY- LBNB BLUB ACTIVE PHENOLS SUB- TOTAL AS CU) AS PB) AS PB) AS MN) AS HG) AS SB) AS AG) AS ZN) AS CN) (UG/L) 10 220 1 30 <0.10 1400 2 90 <0.10 <0.010 STANCE (MG/L) <0.02 <0.010 1 <0.02 RIO GRANDE DE ANASCO BASIN 50144000 RIO GRANDE DE ANASCO NEAR SAN SEBASTIAN, PR 389 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 mi 2 (244.2 km2 ), does not include 36.2 mi 2 (93.8 km2 ) which contributes only during high floods, and 3.5 mi 3 (9.1 km 2 ) which contributes only part of its storm runoff. WATER-DISCHARGE RECORDS PERIOD OF RECORD.--March 1963 to current year. GAGE.--Water-stage recorder. Datum of gage is 103.72 ft (31.614 m) above mean sea level (Puerto Rico Department of Public Works bench mark). Previous to Oct. 30, 1975, at site 600 ft (180 m) upstream at same datum. REMARKS.--Records fair. Transbasin diversion (except during floods) to Rio Yauco basin for hydroelectric power and irrigation above Lago Guayo, Yahuecas, and Prieto, combined useable storage 17,300 acre-ft (21.3 hm3 ) . Limited storm runoff is contributed to basin by 3.5 mi 2 (9.1 km 2 ) above Rio Toro Diversion dam. Gage-height and precipitation satellite telemetry at station. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY OCT NOV DEC JAN PBB APR MAY JUN JUL SEP 1 310 236 2 1260 231 3 723 256 4 1160 220 5 1060 212 6 906 280 7 637 205 8 800 196 9 450 197 10 550 189 11 468 193 12 347 180 13 287 174 14 262 173 15 247 178 16 274 196 17 717 195 18 582 193 19 280 184 20 245 170 21 230 158 22 222 151 23 217 148 24 262 148 25 221 144 26 398 140 27 1090 139 28 650 137 29 566 400 30 349 293 31 261 --- TOTAL 16031 5916 MEAN 517 197 MAX 1260 400 MIN 217 137 AC-PT 31800 11730 CPSM 5.48 2.09 IN. 6.32 2.33 STATISTICS OP MONTHLY MEAN MEAN 669 441 MAX 1467 746 (WY) 1993 1982 MIN 344 197 (WY) 1983 1994 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN-DAY MINIMUM INSTANTANEOUS PEAK PLOW INSTANTANEOUS PEAK STAGE INSTANTANEOUS LOW PLOW ANNUAL RUNOFF (AC- FT) ANNUAL RUNOFF (CPSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 162 144 139 132 246 368 161 142 147 142 137 128 136 548 504 183 150 143 282 641 239 188 165 144 134 129 125 121 118 121 131 6250 202 641 118 12400 2.14 2.47 DATA 223 482 1966 103 1992 FOR 111 111 108 105 101 102 100 99 98 103 94 93 92 92 92 92 87 84 83 81 80 127 438 312 134 113 134 102 95 92 89 3644 118 438 80 7230 1.25 1.44 FOR WATER 140 215 1970 83.6 1965 86 85 85 81 84 82 81 80 78 76 76 74 73 70 73 72 71 69 69 70 67 75 67 67 66 74 71 90 ___ ___ --- 2112 75.4 90 66 4190 .80 .83 YEARS 1963 105 161 1981 62.3 1992 167 184 94 83 76 76 86 80 74 71 70 97 136 88 76 79 74 69 68 67 70 68 66 70 75 261 167 75 78 112 76 2933 94.6 261 66 5820 1.00 1.16 - 1994 98.6 271 1972 54.4 1965 1993 CALENDAR YEAR 118943 326 3840 71 81 235900 3. 46. 675 190 111 May 30 Apr 10 Apr 4 46 92 66 88 189 109 86 77 83 115 80 68 66 64 60 59 63 147 167 205 248 118 97 81 73 68 66 65 78 211 107 78 --- 3082 103 248 59 6110 1.09 1.22 67 64 120 77 69 86 198 132 71 143 496 524 198 117 236 729 538 212 122 95 83 76 131 89 70 65 75 98 164 93 88 5326 172 729 64 10560 1.82 2.10 305 270 820 220 111 84 69 71 235 136 86 72 83 96 125 305 207 107 84 75 71 68 66 66 140 194 85 88 166 99 --- 4604 153 820 66 9130 1.63 1.82 219 125 108 135 118 98 615 369 151 119 141 104 80 76 72 87 83 73 75 73 71 74 70 70 70 70 71 69 68 70 92 3716 120 615 68 7370 1.27 1.47 142 82 70 85 129 136 731 628 381 246 138 105 92 83 142 98 82 77 366 471 169 117 96 210 265 351 335 1330 445 168 123 7893 255 1330 70 15660 2.70 3.11 140 143 114 126 301 113 1010 536 240 153 118 586 393 189 134 116 455 522 337 681 531 385 436 613 563 273 896 355 607 555 --- 11621 387 1010 113 23050 4.11 4.58 , BY WATER YEAR (WY) 146 313 1971 49.3 1968 FOR 1994 73128 200 1330 59 66 7410 8 58 145000 2 28 481 122 70 367 1084 1986 63.7 1967 WATER YEAR Aug 28 Apr 14 Apr 9 Sep 7 . 16 Sep 7 Apr 14 .12 .85 283 815 1979 71.2 1977 274 657 1979 111 1990 WATER 309 460 189 19400 32 35 140000 33 31 223600 3 44 652 185 73 359 936 1979 152 1967 YEARS 1963 Sep Apr Apr Sep .90 Sep Apr .27 .47 602 1422 1984 206 1983 - 1994 1979 1967 16 1975 18 1965 14 1965 16 1975 16 1975 19 1965 390 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 OP RECORD.—Water years 1963 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 OCT 22 JAN 26 APR 21 JUL 29 OCT 22 JAN 26 APR 21 JUL 29 OCT 22 JAN 26 APR 21 JUL 29 DATE 1993 1994 . . . . . . DATE 1993 1994 DATE 1993 1994 TIME 1010 0955 1250 1205 MAGNE- SIUM, . DIS- SOLVED (MG/L AS MG) 9.4 8.6 9.2 9.3 SOLIDS, DIS- SOLVED (TONS PER DAY) 99.6 47.9 42.8 32.0 DIS- CHARGE, INST. CUBIC FEET PER SECOND 221 109 100 69 SODIUM, DIS- SOLVED (MG/L AS NA) 9.0 11 9.4 10 NITRO- GEN, N02+N03 DIS- SOLVED (MG/L AS N) 1.10 1.10 0.920 0.290 SPE- CIFIC CON- DUCT- ANCE (US/CM) 240 250 235 244 SODIUM AD- SORP- TION RATIO 0.4 0.5 0.4 0.4 NITRO- GEN, AMMONIA DIS- SOLVED (MG/L AS N) 0.010 0.030 0.030 0.050 PH WATER WHOLE FIELD (STAND- ARD UNITS) 7.9 7.9 8.0 7.5 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 1.8 2.1 2.1 1.6 NITRO- GEN, AMMONIA DIS- SOLVED (MG/L AS NH4) 0.01 0.04 0.04 0.06 TEMPER- ATURE WATER (DBG C) 25.0 23.0 28.0 29.0 ALKA- LINITY WAT WH TOT PET FIELD MG/L AS CAC03 120 100 90 100 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.30 0.20 0.30 <0.20 TUR- BID- ITY (NTU) 5.7 5.1 1.0 83 SULFATE DIS- SOLVED (MG/L AS SO4) 9.5 12 12 10 PHOS- PHORUS TOTAL (MG/L AS P) 0.040 0.080 0.040 0.060 OXYGEN, DIS- SOLVED (MG/L) 5.2 8.6 8.0 7.4 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 7.0 7.4 8.3 7.4 PHOS- PHORUS DIS- SOLVED (MG/L AS P) 0.030 0.050 0.030 0.030 COLI- FORM, FECAL, 0.45 UM-MF (COLS./ 100 ML) K900 K680 K80 2100 FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.10 <0.10 <0.10 0.20 PHOS- PHORUS ORTHO, DIS- SOLVED (MG/L AS P) 0.030 0.050 0.030 0.020 STREP- TOCOCCI FECAL, (COLS. PER 100 ML) 410 340 K73 390 SILICA, DIS- SOLVED (MG/L AS SI02) 31 27 27 31 PHOS- PHATE, ORTHO, DIS- SOLVED (MG/L AS P04) 0.09 0.15 0.09 0.06 HARD- NESS TOTAL (MG/L AS CAC03 ) 110 110 110 100 SOLIDS, RESIDUE AT 180 DEG. C DIS- SOLVED (MG/L) 160 158 159 172 ALUM- INUM, DIS- SOLVED (UG/L AS AL) 20 20 20 30 CALCIUM DIS- SOLVED (MG/L AS CA) 29 28 28 26 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 167 163 150 157 BARIUM, DIS- SOLVED (UG/L AS BA) 34 30 35 46 K = non-ideal count RIO QRANDE DE ANASCO BASIN 50144000 RIO GRANDE DE AfiASCO NEAR SAN SEBASTIAN, PR--CONTINUED (NATIONAL STREAM-QUALITY ACCOUNTING NETWORK STATION) WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 397 DATE OCT 1993 22. . . JAN 1994 26. . . APR 21. . . JUL 29. .. COBALT, DIS- SOLVED (UG/L AS CO) <3 <3 <3 <3 IRON, DIS- SOLVED (UG/L AS FB) 20 25 12 23 LITHIUM DIS- SOLVED (UG/L AS LI) <4 5 <4 <4 MANGA- NESE, DIS- SOLVED (UG/L AS MN) 20 24 29 310 MERCURY DIS- SOLVED (UG/L AS HG) <0.1 -- -- -- MOLYB- DENUM, DIS- SOLVED (UG/L AS MO) <10 10 <10 <10 NICKEL, DIS- SOLVED (UG/L AS NI) 1 3 1 1 SELE- NIUM, SILVER, DIS- DIS- SOLVED SOLVED (UG/L (UG/L AS SB) AS AG) <1 <1.0 <1 <1.0 <1 <1.0 <1 <1.0 STRON- TIUM, DIS- SOLVED (UG/L AS SR) 140 130 140 130 VANA- DIUM, DIS- SOLVED (UG/L AS V) <6 <6 7 12 PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT DATE OCT 1993 22. . . OUL 1994 29. .. TIME 1010 1205 STREAM- FLOW, INSTAN- TANEOUS 221 69 SEDI- MENT, SUS- PENDED 25 184 SEDI- MENT, DIS- CHARGE, SUS- PENDED 15.0 34.3 SBD. SUSP. SIEVE DIAM. PERCENT FINER THAN 98 98 392 RIO GRANDB DE ANASCO BASIN 50146000 RIO GRANDE DE ANASCO NEAR ANASCO, PR (National stream-quality accounting network station) WATER-QOALITY RECORDS LOCATION.--Lat 18<>16'00", long 67°08'05", at bridge on Highway 430, 0.2 mi (0.3 km) south of Highway 109 at El Espino and 1.4 mi (2.3 km) east-southeast from Afiasco plaza. DRAINAGE ARBA.--139 mi 1 (360 km 1 ) this does not include 39.7 mi» (102.8 km1 ), flow is diverted to south coast. PERIOD OF RECORD.—Water years 1979 to current year. WATER-QOALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE OCT 1993 19. .. DEC 10... MAR 1994 02... APR 21. . . JUN 29. . . AUG 19. . . DATE OCT 1993 19. .. DEC 10. .. MAR 1994 02. .. APR 21. .. JUN 29. . . AUG 19. . . DATE OCT 1993 19. . . DEC 10. . . MAR 1994 02. .. APR 21. .. JUN 29. . . AUG 19. .. TIME 1220 0735 1420 0840 0855 1115 HARD- NESS TOTAL (MG/L AS CAC03) 73 -- -- 99 -- 110 SILICA, DIS- SOLVED (MG/L AS SIO2) 24 -- -- 26 -- 29 DIS- CHARGE, INST. CUBIC FEET PER SECOND E400 E300 216 128 161 116 CALCIUM DIS- SOLVED (MG/L AS CA) 18 -- -- 26 -- 28 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 116 -- -- 144 -- 161 SPE- CIFIC CON- DUCT- ANCE (US/CM) 178 240 210 225 215 249 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 6.7 -- -- 8.2 -- 9.5 SOLIDS, DIS- SOLVED (TONS PER DAY) __ __ -- 49.8 __ 50.5 PH WATER WHOLE FIELD (STAND- ARD UNITS) 7.4 7.6 7.3 7.6 7.5 7.4 SODIUM, DIS- SOLVED (MG/L AS NA) 6.4 -- __ 8.5 _- 9.4 RESIDUE TOTAL AT 105 DEG. C, SUS- PENDED (MG/L) 144 24 94 19 54 17 TEMPER- ATURE WATER (DBG C) 25.5 24.0 25.0 25.0 25.0 28.0 SODIUM AD- SORP- TION RATIO 0.3 — __ 0.4 — 0.4 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.40 <0.20 0.40 __ 0.30 <0.20 TUR- BID- ITY (NTU) 82 14 54 3.0 54 6.4 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 2.0 -- __ 2.0 __ 1.8 PHOS- PHORUS TOTAL (MG/L AS P) 0.050 0.030 0.110 __ 0.070 0.040 OXYGEN, DIS- SOLVED (MG/L) 6.4 5.6 7.6 8.2 7.0 7.4 ALKA- LINITY WAT WH TOT PET FIELD MG/L AS CACO3 76 110 85 92 90 110 ARSENIC TOTAL (UG/L AS AS) <1 __ __ <1 __ -- OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 77 65 91 99 84 94 SULFIDE TOTAL (MG/L AS S) <0.5 -- _- <0.5 _- -- BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) 100 __ __ <100 __ -- OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 17 <10 13 <10 16 13 SULFATE DIS- SOLVED (MG/L AS SO4) 7.3 -- -- 11 -- 9.1 BORON, TOTAL RECOV- ERABLE (UG/L AS B) <10 __ -- 10 __ -- COLI- FORM, FECAL, 0.45 UM-MF (COLS./ 100 ML) 3100 460 3800 230 4300 200 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 6.3 -- -- 7.2 -- 8.2 CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 __ -- <1 __ -- STREP- TOCOCCI FECAL, (COLS. PER 100 ML) K17000 K150 10000 220 2000 K150 FLUO- RIDE, DIS- SOLVED (MG/L AS F) <0.10 -- -- <0.10 -- 0.20 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) 2 __ -- <1 __ -- E = estimate K = non-ideal count RIO GRANDE DE ANASCO BASIN 50146000 RIO GRANDE DE ANASCO NEAR ANASCO, PR--Continued (National atream-quality accounting network station) WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 393 DATE OCT 1993 19. .. DEC 10. .. MAR 1994 02. .. APR 21. .. JDN 29. .. AUG 19. . . COPPER, TOTAL RECOV- ERABLE (UG/L AS CU) IRON, TOTAL RECOV- ERABLE (UG/L AS FE) LEAD, TOTAL RECOV- ERABLE (UG/L AS PB) MANGA- NESE, TOTAL RECOV- ERABLE (UG/L AS MN) MERCURY TOTAL RECOV- ERABLE (UG/L AS HG) SELE- NIUM, TOTAL (UG/L AS SB) SILVER, TOTAL RECOV- ERABLE (UG/L AS AG) ZINC, TOTAL RECOV- ERABLE (UG/L AS ZN) CYANIDE TOTAL (MG/L AS CN) PHENOLS TOTAL (UG/L) MBTHY- LBNE BLUE ACTIVE SUB- STANCE (MG/L) 20 3400 520 13 250 80 <0.10 <0.10 20 <0.010 <0.010 <0.02 <0.02 PESTICIDE ANALYSES DATE JDN 1994 29.. . DATE JDN 1994 29.. . CHLOR- DI- DI- ENDO- PCB, ALDRIN, DANE, DDD, DDE, DDT, AZINON, ELDRIN SDLFAN, TIME TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (DG/L) (UG/L) (DG/L) (UG/L) (UG/L) (UG/L) (UG/L) 0855 BNDRIN WATER DNFLTRD REC (DG/L) <0.1 <0.010 HEPTA- ETHION, CHLOR, TOTAL TOTAL (DG/L) (DG/L) <0.1 <0. HEPTA- CHLOR EPOXIDE TOTAL (DG/L) ,010 <0.010 <0, MALA- LINDANE THION, TOTAL TOTAL (DG/L) (DG/L) 010 MBTH- OXY- CHLOR, TOTAL (UG/L) 0.01 <0.010 <0.010 METHYL PARA- THION, MIREX, TOTAL TOTAL (UG/L) (UG/L) <0.010 <0.01 <0.010 <0.010 <0.010 <0.01 <0.01 <0.01 <0.01 DATE JDN 1994 29.. . PARA- THION, TOTAL (UG/L) NAPH- THA- LENES, POLY- CHLOR. TOTAL (DG/L) PER- THANE TOTAL (UG/L) TOX- APHENE, TOTAL (UG/L) TOTAL TRI- THION (UG/L) 2,4-D, TOTAL (UG/L) 2,4,5-T TOTAL (UG/L) 2, 4-DP TOTAL (UG/L) SILVBX, TOTAL (UG/L) <0.01 <0.10 <1 <0.01 <0.01 <0.01 <0.01 <0.01 394 THIS PAGE WAS LEFT BLANK INTENTIONALLY I AGUADILLA / ^-J Drainage boundary uncertain J k\ EXPLANATION A1478 SURFACE-WATER STATION AND NUMBER ^1476 QUALITY-OF-WATER STATION AND NUMBER • 83 WELL AND WELL NUMBER LARES 0123456 KILOMETERS i l 01234 MILES CO <0 01 Figure 27.--Rfo Culebrinas basin. 396 RIO CDLEBRINAS BASIN 50147600 RIO CDLEBRINAS NEAR SAN SEBASTIAN, PR HATER-QUALITY RECORDS LOCATION.—Lat 18°20'51" / long 67°02'40", at bridge on Highway 423, 1.3 mi (2.1 km) south of Bridge on Highway 111, and 2.1 mi (3.4 km) west of Central La Plata. DRAINAGE AREA.--58.2 mi» (150.7 km2 ). PERIOD OF RECORD.—Hater years 1979 to current year. HATER-QUALITY DATA, HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 Quebrada El Salto DATE OCT 1993 21. .. DEC 09. .. MAR 1994 07. .. APR 22. .. JUN 29... ADG 18. .. DATE OCT 1993 21... DEC 09... MAR 1994 07. .. APR 22. . . JUN 29. .. AUG 18. .. DATE OCT 1993 21. .. DEC 09. . . MAR 1994 07. .. APR 22... JUN 29. . . AUG 18. .. TIME 0945 1050 1100 0825 1150 1155 HARD- NESS TOTAL (MG/L AS CAC03) 110 — — 100 — 120 SILICA, DIS- SOLVED (MG/L AS SIO2) 28 -- -- 34 -- 28 DIS- CHARGE, INST. CUBIC FEET PER SECOND 157 67 47 27 54 53 CALCIUM DIS- SOLVED (MG/L AS CA) 38 -- -- 32 -- 40 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 173 -- -- 180 -- 184 SPE- CIFIC CON- DUCT- ANCE (US/CM) 275 296 263 268 245 285 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 4.8 — -- 5.8 -- 5.2 SOLIDS, DIS- SOLVED (TONS PER DAY) 73.5 -- -- 13.4 -- 26.5 PH HATER HHOLB FIELD (STAND- ARD UNITS) 7.8 7.9 7.0 7.5 7.7 7.7 SODIUM, DIS- SOLVED (MG/L AS NA) 9.3 -- -- 14 -- 13 RESIDUE TOTAL AT 105 DBG. C, SUS- PENDED (MG/L) 4 7 33 8 8 8 TEMPER- ATURE HATER (DBG C) 25.0 23.0 24.5 24.5 27.0 27.5 SODIUM AD- SORP- TION RATIO 0.4 — — 0.6 — 0.5 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) <0.20 0.30 0.50 — 0.30 0.30 TUR- BID- ITY (NTU) 4.8 5.4 25 1.0 12 3.6 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 2.2 -- -- 2.6 -- 2.6 PHOS- PHORUS TOTAL (MG/L AS P) 0.050 0.080 0.150 -- 0.080 0.070 OXYGEN, DIS- SOLVED (MG/L) 7.1 5.5 8.4 7.2 9.4 8.4 ALKA- LINITY HAT HH TOT FET FIELD MG/L AS CAC03 120 120 97 110 97 120 ARSENIC TOTAL (UG/L AS AS) <1 -- — 1 -- — OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 84 63 100 86 117 105 SULFIDB TOTAL (MG/L AS S) <0.5 -- -- <0.5 -- -- BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) 100 -- -- <100 -- -- OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) <10 <10 <10 15 15 <10 SULFATB DIS- SOLVED (MG/L AS S04) 9.5 -- -_ 12 — 12 BORON, TOTAL RECOV- ERABLE (UG/L AS B) 20 -- -- 40 -- — COLI- FORM, FECAL, 0.45 UM-MF (COLS. / 100 ML) 3900 4500 70000 370 45000 K1500 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 9.5 -- -- 14 -- 11 CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- <1 -- -- STREP- TOCOCCI FECAL, (COLS. PER 100 ML) 2200 K1100 12000 K140 650 340 FLUO- RIDB, DIS- SOLVED (MG/L AS F) 0.20 -- -- 0.10 — 0.20 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) <1 -- -- <1 — — K = non-ideal count RIO COLEBRINAS BASIN 397 50147600 RIO COLEBRINAS NEAR SAN SEBASTIAN, PR—Continued WATER-QUALITY DATA, HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 COPPER, TOTAL RECOV- ERABLE DATE (OG/L IRON, TOTAL RECOV- ERABLE (OG/L LEAD, TOTAL RECOV- ERABLE (OG/L MANGA- NESE, MBRCORY TOTAL TOTAL RECOV- ERABLE (OG/L RECOV- ERABLE (OG/L SBLB- NIOM, TOTAL (OG/L SILVER, TOTAL RECOV- ERABLE (OG/L ZINC, TOTAL RBCOV- CYANIDE BRABLE TOTAL (OG/L (MG/L MBTHY- LBNB BLOB ACTIVE PHENOLS SOB- TOTAL STANCE AS CO) AS PE) AS PB) AS MN) AS HG) AS SB) AS AG) AS ZN) AS CN) (OG/L) OCT 1993 21. .. DEC 09... MAR 1994 07... APR 22. .. JON 29... AOG 18. .. 330 250 40 30 <0.10 <0.10 <0.010 <0.010 (MG/L) 1 <0.02 2 0.09 398 RIO CULEBRINAS BASIN 50147800 RIO CULEBRINAS AT HIGHWAY 404 NEAR HOCA, 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 from Quebrada Yagruma, and 2.8 mi (4.5 km) southeast of Moca. DRAINAGE AREA.--71.2 mi 1 (184.4 km 1 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--July 1967 to current year. GAGE.--Water-stage recorder. Elevation of gage is 45 ft (14 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. Gage-height and precipitation satellite telemetry at station. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY NOV DEC JAN FBB MAR APR MAY JUN JUL AUG SEP 1 2380 193 2 429 204 3 295 227 4 5700 175 5 3260 216 6 1390 594 7 448 260 8 e900 189 9 e490 195 10 e600 170 11 e520 159 12 e390 151 13 e310 146 14 e290 153 15 e270 197 16 e300 301 17 e800 199 18 e640 170 19 e300 205 20 e270 155 21 243 143 22 229 134 23 342 129 24 856 125 25 338 121 26 835 117 27 496 114 28 361 110 29 260 157 30 235 173 31 205 TOTAL 24382 5582 MEAN 787 186 MAX 5700 594 MIN 205 110 AC-FT 48360 11070 CFSM 11.0 2.61 IN. 12.74 2.92 STATISTICS OF MONTHLY MEAN MEAN 639 344 MAX 1086 799 (WY) 1973 1982 MIN 231 108 (WY) 1968 1979 SUMMARY STATISTICS ANNUAL TOTAL ANNUAL MEAN HIGHEST ANNUAL MEAN LOWEST ANNUAL MEAN HIGHEST DAILY MEAN LOWEST DAILY MEAN ANNUAL SEVEN -DAY MINIMUM INSTANTANEOUS PEAK FLOW INSTANTANEOUS PEAK STAGE INSTANTANEOUS LOW FLOW ANNUAL RUNOFF (AC-FT) ANNUAL RUNOFF (CFSM) ANNUAL RUNOFF (INCHES) 10 PERCENT EXCEEDS 50 PERCENT EXCEEDS 90 PERCENT EXCEEDS 112 106 103 101 192 258 115 102 95 94 89 86 87 120 142 87 83 82 264 684 250 143 116 101 96 94 89 85 85 84 90 4235 137 684 82 8400 1.92 2.21 DATA 144 424 1982 72.1 1992 FOR 82 82 80 75 71 72 70 70 73 73 68 68 67 66 67 66 63 64 63 62 60 62 105 80 75 62 60 57 56 56 54 2129 68.7 105 54 4220 .96 1.11 52 51 51 51 50 47 47 46 46 44 44 44 43 42 43 41 40 39 38 46 40 88 102 78 65 141 175 70 ___ ___ --- 1664 59.4 175 38 3300 .83 .87 FOR WATER YEARS 1967 77.3 151 1971 51.2 1979 69.8 243 1981 37.0 1992 71 62 54 51 48 71 74 59 52 75 95 247 179 71 56 51 43 39 37 36 34 35 35 75 79 39 42 32 30 34 50 1956 63.1 247 30 3880 .89 1.02 - 1994 65.5 319 1981 30.4 1979 1993 CALENDAR YEAR 96050 263 5700 40 44 190500 3 .70 50.18 507 123 61 Oct 4 Mar 24 Mar 18 33 31 35 35 33 32 36 31 29 28 28 27 27 26 28 28 34 31 35 33 41 35 32 29 28 27 33 120 120 102 --- 1187 39.6 120 26 2350 .56 .62 50 41 38 41 38 73 96 50 63 296 274 226 152 126 688 2210 831 282 162 119 96 81 72 66 60 55 54 104 185 113 79 6821 220 2210 38 13530 3.09 3.56 71 77 337 196 813 200 121 96 83 91 229 251 133 96 306 228 175 129 114 104 99 93 89 86 85 86 82 93 127 145 4835 161 813 71 9590 2.26 2.53 95 78 81 75 69 65 70 128 76 68 82 70 63 59 56 91 97 63 62 58 55 53 50 48 48 48 48 46 46 51 70 2069 66.7 128 46 4100 .94 1.08 270 122 71 63 82 271 393 908 364 161 171 133 111 101 108 116 93 86 91 600 540 192 114 106 196 109 223 232 138 103 91 6359 205 908 63 12610 2.88 3.32 87 197 145 271 368 198 266 1620 550 248 162 146 185 145 124 113 106 120 352 245 3120 588 253 246 2500 270 286 237 960 2560 --- 16668 556 3120 87 33060 7.80 8.71 , BY WATER YEAR (WY) 139 621 1986 26.4 1970 FOR 1994 77887 213 5700 26 27 28400 28 25 154500 3 40 356 93 38 465 2054 1986 96.7 1973 WATER YEAR Oct 4 Apr 14 Apr 10 Oct 4 .52 Oct 4 Apr 13 .00 .69 373 769 1984 82.7 1974 298 847 1979 66.7 1994 WATER 291 457 179 13300 19 20 69000 36, 16 210600 4, 55, 600 135 42 332 831 1979 119 1970 YEARS 1967 Oct Apr Apr Sep . 6 0 Sep Apr .08 .48 518 1350 1978 145 1986 - 1994 1986 1977 21 1972 16 1979 13 1979 16 1975 16 1975 17 1979 e Estimated RIO CULEBRINAS BASIN 399 50149100 RIO CULBBRINAS NEAR AGUADA, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°24'03", long 67009'40", at bridge on Highway 2, and 2.3 mi (3.7 km) northeast of Aguada plaza. DRAINAGE AREA.--97.0 mi 3 (251.2 km3 ). PERIOD OF RECORD.--Water years 1958, 1970 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE OCT 1993 21... DEC 10. .. MAR 1994 02. .. APR 22. .. JUN 29. .. AOG 18. .. DATE OCT 1993 21. .. DEC 10. .. MAR 1994 02. .. APR 22. .. JUN 29. . . AUG 18. . . DATE OCT 1993 21. . . DEC 10. . . MAR 1994 02. .. APR 22. .. JUN 29. .. AUG 18. .. TIME 1150 0930 1215 1015 1315 1310 HARD- NESS TOTAL (MG/L AS CACO3 ) 130 -- -- 120 -- 150 SILICA, DIS- SOLVED (MG/L AS SI02) 27 -- -- 36 -- 28 DIS- CHARGE, INST. CUBIC FEET PER SECOND 407 150 107 -- -- - - CALCIUM DIS- SOLVED (MG/L AS CA) 45 -- -- 39 -- 50 SOLIDS, SUM OF CONSTI- TUENTS, DIS- SOLVED (MG/L) 201 -- -- 202 -- 213 SPE- CIFIC CON- DUCT- ANCE (US/CM) 312 340 345 298 252 338 MAGNE- SIUM, DIS- SOLVED (MG/L AS MG) 5.4 -- -- 5.9 -- 6.3 SOLIDS, DIS- SOLVED (TONS PER DAY) 221 -- -- -- -- -- PH WATER WHOLE FIELD (STAND- ARD UNITS) 7.7 7.7 7.1 7.6 7.3 7.7 SODIUM, DIS- SOLVED (MG/L AS NA) 11 -- -- 16 -- 12 RESIDUE TOTAL AT 105 DEG. C, SUS- PENDED (MG/L) 82 19 24 45 190 9 TEMPER- ATURE WATER (DEG C) 27.0 23.5 25.0 27.0 26.5 28.0 SODIUM AD- SORP- TION RATIO 0.4 -- -- 0.6 -- 0.4 NITRO- GEN, AM- MONIA + ORGANIC TOTAL (MG/L AS N) 0.60 0.40 0.80 -- 0.50 0.20 TUR- BID- ITY (NTU) 37 12 3.0 5.0 200 1.1 POTAS- SIUM, DIS- SOLVED (MG/L AS K) 2.4 -- -- 3.0 -- 2.6 PHOS- PHORUS TOTAL (MG/L AS P) 0.050 0.060 0.110 -- 0.120 0.050 OXYGEN, DIS- SOLVED (MG/L) 2.5 4.2 6.4 6.8 6.8 7.0 ALKA- LINITY WAT WH TOT PET FIELD MG/L AS CACO3 150 150 130 130 98 150 ARSENIC TOTAL (UG/L AS AS) <1 -- -- 1 -- -- OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) 31 48 77 85 84 89 SULFIDE TOTAL (MG/L AS S) <0.5 -- -- <0.5 -- "" BARIUM, TOTAL RECOV- ERABLE (UG/L AS BA) <100 -- -- <100 -- -- OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) 12 <10 13 21 23 <10 SULFATE DIS- SOLVED (MG/L AS S04) 10 -- -- 9.1 -- 11 BORON, TOTAL RECOV- ERABLE (UG/L AS B) 10 -- -- 40 -- -- COLI- FORM, FECAL, 0.45 UM-MF (COLS./ 100 ML) K7500 200 M600 200 K8000 430 CHLO- RIDE, DIS- SOLVED (MG/L AS CL) 10 -- -- 15 -- 13 CADMIUM TOTAL RECOV- ERABLE (UG/L AS CD) <1 -- -- <1 -- -- STREP- TOCOCCI FECAL, (COLS. PER 100 ML) 6200 640 100000 K190 2600 310 FLUO- RIDE, DIS- SOLVED (MG/L AS F) 0.10 -- -- 0.10 -- 0.20 CHRO- MIUM, TOTAL RECOV- ERABLE (UG/L AS CR) 1 -- -- 1 -- -- K = non-ideal count 400 RIO C0LBBRINAS BASIN 50149100 RIO COLEBRINAS NEAR AGOADA, PR—Continued HATER-QUALITY DATA, HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE COPPER, TOTAL RECOV- ERABLE (OG/L IRON, TOTAL RECOV- ERABLE (OG/L LEAD, TOTAL RECOV- ERABLE (OG/L MANGA- NESE, TOTAL RECOV- ERABLE (OG/L MBRCORY TOTAL RECOV- ERABLE (OG/L SBLB- NIOM, TOTAL (OG/L SILVER, TOTAL RECOV- ERABLE (OG/L ZINC, TOTAL RECOV- ERABLE (OG/L CYANIDE TOTAL (MG/L PHENOLS TOTAL METHY- LBNE BLOB ACTIVE SOB- STANCE OCT 1993 21... DEC 10... MAR 1994 02. .. APR 22. .. JON 29. .. AOG 18. .. AS CO) AS PE) AS PB) AS MN) AS HG) AS SB) AS AG) AS ZN) AS CN) (OG/L) 10 2000 1100 150 130 <0.10 <0.10 10 <0.010 30 <0.010 (MG/L) <0.02 0.06 PESTICIDE ANALYSES DATE JON 1994 29... PCB, TIME TOTAL (OG/L) 1315 CHLOR- ALDRIN, DANE, TOTAL TOTAL (OG/L) (OG/L) ).010 ODD, TOTAL (OG/L) DI- DI- BNDO- DDE, TOTAL (OG/L) DOT, AZINON, BLDRIN SOLFAN, TOTAL (OG/L) ).010 <0.010 <0.010 TOTAL (OG/L) TOTAL (OG/L) TOTAL (OG/L) 0.01 <0.010 <0.010 DATE JON 1994 29.. . ENDRIN HATER ONPLTRD BTHION, REC (OG/L) <0.010 TOTAL (OG/L) HEPTA- HBPTA- CHLOR CHLOR, BPOXIDB LINDANE TOTAL TOTAL TOTAL (OG/L) (OG/L) (OG/L) <0.01 <0.010 <0.010 <0.010 MALA- THION, TOTAL (OG/L) <0.01 METH- OXY- CHLOR, TOTAL (OG/L) <0.01 METHYL PARA- THION, TOTAL (OG/L) <0.01 MIRBX, TOTAL (OG/L) <0.01 DATE JON 1994 29.. . PARA- THION, TOTAL (OG/L) NAPH- THA- LENES, POLY- CHLOR. TOTAL (OG/L) PBR- THANB TOTAL (OG/L) TOX- APHBNE, TOTAL (OG/L) TOTAL TRI- THION (OG/L) 2,4-D, TOTAL (OG/L) 2,4,5-T TOTAL (OG/L) 2, 4-DP TOTAL (OG/L) SILVBX, TOTAL (OG/L) <0.01 <0.10 <0.01 <0.01 <0.01 <0.01 <0.01 VIEQDBS, PR 50232000 QDBBRADA LA MINA NEAR ESPBRANZA, VIEQOES, PR 407 LOCATION.--Lat 18°06'54", long 65 028'15 M , Hydrologic Unit 21010006, on left bank 300 ft (91 m), west from state road 996, 1.4 mi (2.2 km) south of Cerro Hartineau, 0.7 mi (1.1 km) east-northeast of Colonia Puerto Real on road 201 and 1.2 mi (1.9 km) north of Bsperanza. DRAINAGE AREA.--0.68 mi> (1.76 km'). WATER-STAGE RECORDS PERIOD OF RECORD.--July 1991 to current year. GAGE.--Water-stage recorder. Elevation of gage is 98 ft (30 m), from topographic map. REMARKS.--Gage-height and precipitation satellite telemetry at station. All gage-heights of 9.20 ft or lower are considered zero flow. EXTREMES OBSERVED FOR PERIOD OF RECORD.--Maximum gage-height, 9.90 ft (3.018 m), June 29, 30; minimum, 8.76 ft (2.670 m). May 18-24. EXTREMES FOR CURRENT YEAR.--Maximum gage-height, 9.12 ft (2.780 m), Oct. 22,23; minimum, 8.76 ft (2.670 m), May 18-24. DAY OCT GAGE HEIGHT, FEET, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES NOV DEC JAN FBB MAR APR MAY JUN JUL SEP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN MAX MIN MED CAL YR WTR YR 9.03 8.87 8.79 8.80 8.79 8.78 8.79 8.79 8.79 8.79 8.79 8.80 8.80 8.80 8.80 8.80 8.80 8.80 8.81 8.80 8.79 9.12 9.12 9.09 8.93 8.80 8.80 8.80 8.79 8.79 8.79 8.84 9.12 8.78 8.80 1993 1994 8.80 8.79 8.79 8.79 8.79 8.79 8.79 8.80 8.79 8.79 8.80 8.80 8.81 8.81 8.80 8.80 8.81 8.81 8.81 8.81 8.80 8.80 8.79 8.79 8.79 9.10 8.98 8.79 8.78 8.78 --- 8.81 9.10 8.78 8.80 MEAN 8.87 MEAN 8.82 8.78 8.78 8.78 8.78 8.78 8.78 8.78 8.79 8.79 8.79 8.80 8.80 8.81 8.81 8.81 8.80 8.80 8.79 8.79 8.78 8.78 8.78 8.77 8.78 8.78 8.78 8.78 8.79 8.79 8.79 8.79 8.79 8.81 8.77 8.79 MAX 9.88 MAX 9.12 8.80 8.80 8.80 8.81 8.81 8.82 8.82 8.79 8.80 8.79 8.79 8.80 8.81 8.81 8.81 8.81 8.82 8.82 8.82 8.83 8.83 8.82 8.81 8.80 8.80 8.79 8.80 8.82 8.82 8.83 8.82 8.81 8.83 8.79 8.81 MIN 8.77 MIN 8.70 8.81 8.81 8.81 8.81 8.80 8.80 8.79 8.80 8.79 8.79 8.79 8.79 8.80 8.80 8.81 8.80 8.80 8.80 9.07 8.90 8.81 8.81 8.82 8.82 8.82 8.81 8.81 8.81 ___ ___ --- 8.82 9.07 8.79 8.81 MED 8. MED 8. 8.81 8.81 8.80 8.81 8.80 8.80 8.81 8.80 8.80 8.80 8.80 8.81 8.81 8.80 8.81 8.81 8.81 8.81 8.82 8.82 8.81 8.81 8.81 8.80 8.80 8.80 8.80 8.80 8.80 8.80 8.80 8.81 8.82 8.80 8.80 ,85 ,81 8.80 8.80 8.80 8.81 8.81 8.81 8.81 8.81 8.81 8.81 8.81 8.81 8.82 8.82 8.81 8.80 8.80 8.80 8.79 8.79 8.79 8.79 8.79 8.79 8.79 8.79 8.79 8.79 8.80 8.80 --- 8.80 8.82 8.79 8.80 8.80 8.80 8.80 8.80 8.80 8.80 8.81 8.82 8.80 8.80 8.80 8.79 8.78 8.78 8.77 8.77 8.77 8.76 8.76 8.76 8.76 8.76 8.76 8.76 8.77 8.77 8.78 8.78 8.79 8.79 8.80 8.78 8.82 8.76 8.78 8.81 8.81 8.80 8.80 8.79 8.79 8.79 8.79 8.79 8.79 8.79 8.80 8.80 8.80 8.81 8.85 8.85 8.85 8.85 8.85 8.85 8.85 8.85 8.85 8.85 8.85 8.86 8.86 8.85 8.85 8.82 8.86 8.79 8.83 8.85 8.85 8.85 8.85 8.85 8.85 8.85 8.86 8.86 8.86 8.86 8.86 8.86 8.87 8.70 8.86 8.86 8.86 8.86 8.86 8.86 8.86 8.86 8.86 8.86 8.86 8.86 8.86 8.86 8.86 8.86 8.85 8.87 8.70 8.86 8.86 8.86 8.86 8.86 8.86 8.86 8.86 8.86 8.86 8.86 8.86 8.86 8.86 8.86 8.86 8.86 8.86 8.86 8.86 8.86 8.86 8.86 8.86 8.86 8.86 8.86 8.86 8.86 8.86 8.86 8.86 8.86 8.86 8.86 8.86 8.86 8.86 8.86 8.86 8.86 8.86 8.85 8.85 8.85 8.85 8.85 8.85 8.85 8.85 8.85 8.85 8.85 8.85 8.85 8.85 8.85 8.85 8.85 8.85 8.85 8.85 8.85 8.85 8.85 8.85 --- 8.85 8.86 8.85 8.85 402 VIEQUES, PR 50233000 QUEBRADA PILON AT COLONIA PUERTO REAL, VIEQUES, PR LOCATION.--Lat 18°06'37", long 65°28'51", Hydrologic Unit 21010006, on left bank, 1.2 mi (1.9 km), southeast of Cerro Sonadora, 1.2 mi (1.9 km) northwest of Esperanza, 0.4 mi (0.6 km) south of junction of Highways 895 and 201. DRAINAGE AREA.--0.67 mi s (1.74 km1 ). WATER-STAGE RECORDS PERIOD OF RECORD.--July 1991 to current year. GAGE.--Hater-stage recorder. Elevation of gage is 131 ft (40 m), from topographic map. REMARKS.--Gage-height and precipitation satellite telemetry at station. All gage-heights of 8.20 ft or lower are considered zero flow. EXTREMES FOR PERIOD OF RECORD.--Maximum gage-height, 9.13 ft (2.783 m), July 23, 1993; minimum, 6.68 ft (2.036 m), Sept. 14, 15, 1993. EXTREMES FOR CURRENT YEAR.--Maximum gage-height, 7.17 ft (2.185 m), Oct. 1; minimum, 7.15 ft (2.179 m), Oct. 3-13. GAGE HEIGHT, FEET, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DAILY MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SE1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 MEAN MAX MIN 7.17 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.15 7.15 7.15 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.17 7.15 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 --- 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 7.16 A A A A A A A A A ___ ___ --- 7.16 7.16 7.16 A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A ___ ___ ___ A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A ___ ___ ___ A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A ___ ___ A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A ___ ___ ___ A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A ___ ___ --- A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A ___ ___ --- A A A A A A A A A A A A A A A A A A A A A A A A A A 7.16 7.16 7.16 7.16 --- 7.16 7.16 7.16 CAL YR 1993 MEAN 7.24 MAX 7.75 MIN 6.80 WTR YR 1994 MEAN 7.16 MAX 7.17 MIN 7.15 A No gage-height record 403 Discharge at Parcial-Record Stations in Puerto Rico 404 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 1994 PUBLICATION RECORD STATION STATION NUMBER NAME 50010520 Rio Guajataca above sewage plant at Lares, PR 50013000 Rio Camuy near Lares, PR 50014000 Rio Criminales near Lares, PR 50014500 Rio Camuy off Highway 129 near Lares, PR 50020150 Rio Vacas near Adjuntas, PR 50020295 Rio Cidra at Adjuntas, PR 50020500 Rio Grande de Arecibo near Adjuntas, PR LOCATION AND BASIN Rio Guajataca basin Lat 18°18'13", long 66°52'34", Hydrologic Unit 21010001, at barrio Pueblo, 0.5 mi (0.8 km) downstream from Highway 111, 1.5 mi (2.4 km) northwest from Cerro Palma, and 0.5 mi (0.8 km) north of Lares plaza. Rio Camuy basin Lat 18°17'49", long 66°49'31", Hydrologic Unit 21010001, at bridge on Highway 111, 1.1 mi (1.8 km) upstream from Rio Criminales, 1.8 mi (2.9 km) downstream from Rio Angeles and Rio Piedras confluence, and 3.5 mi (5.6 km) east of Lares. Lat 18°17'57", long 66°49'22", Hydrologic Unit 21010001, at bridge on Highway 111, 0.7 mi (1.1 km) upstream from Rio Camuy, and 3.7 mi (5.6 km) east of Lares. Lat 18°19'01", long 66°49'38", Hydrologic Unit 21010002, at barrio CalleJones, 1.1 mi (1.8 km) downstream from Rio Criminales, 1.9 mi (3.1 km) east from Cueva Pajita, and 4.0 mi (6.4 km) northeast from Lares. Rio Grande de Arecibo basin Lat 18°10'29", long 66°44'16", Hydrologic Unit 21010001, at barrio Garzas on Highway 522, 0.6 mi (1.0 km) upstream from Highway 135, 2.2 mi (3.5 km) north of Lago Garzas, and 1.2 mi (1.9 km) northwest of Adjuntas plaza. Lat 18°09'58", long 66°43'37", Hydrologic Unit 21010001, at Adjuntas, 0.1 mi (0.2 km) downstream from Highway 10, 1.9 mi (3.1 km) northeast of Lago Garzas, and 0.3 mi (0.5 km) northwest of Adjuntas plaza. Lat 18°10'54", long 66°44'12", Hydrologic Unit 21010001, at bridge on Highway 135, 1.0 mi (1.6 km) upstream from Lago Adjuntas, and 1.5 mi (2.4 km) northwest of Adjuntas plaza. DRAINAGE AREA (km') 5.40 (14.0) 7.62 (19.7) 4.68 (12.1) 13.6 (35.2) 3.10 (8.03) 6.67 (17.3) 12.7 (32.9) 2/23/94 4/21/94 TIME 1350 1320 2/23/94 4/21/94 2/23/94 4/21/94 2/23/94 4/21/94 1120 1000 1220 1055 1025 0850 3/02/94 5/04/94 3/02/94 5/04/94 3/02/94 5/04/94 1325 1320 1230 1410 1245 1140 STREAM- FLOW ft'/s (mVs) 3.34 (0.095) 3.01 (0.085) 7.02 (0.199) 6.01 (0.170) 3.81 (0.108) 3.00 (0.085) 9.61 (0.272) 7.52 (0.213) 4.67 (0.132) 2.06 (0.058) 7.67 (0.217) 2.97 (0.084) 15.4 (0.436) 6.18 (0.175) DISCHARGE AT PARTIAL-RECORD STATIONS 405 STATION NUMBER 50021000 STATION NAME Low-flow partial-record stations—Continued LOCATION AND BASIN Rio Pellejas at Central Pellejas, PR 50021800 Rio Guaonica near Utuado, PR 50021900 50021905 Quebrada Arenas near Utuado, PR Rio Grande de Arecibo near Dtuado, PR 50023000 Rio Vivi near Central Pellejas , PR 50025165 Rio Caricaboa at Jayuya, PR 50025175 50025600 Rio Grande de Jayuya at Jayuya, PR Rio Jauca near Jayuya, PR 50025900 Rio Jauca at mouth near Jayuya, PR DRAINAGE AREA (km») Rio Grande de Arecibo basin Lat 18°12'07", long 66°42'16", 5.46 Hydrologic Unit 21010001, at (14.1) barrio Pellejas near Highway 524, 0.1 mi (0.2 km) upstream from unnamed tributary and diversion tunnel, 1.0 mi (1.6 km) upstream from Lago Pellejas, and 2.9 mi (4.7 km) northeast of Adjuntas plaza. Lat 18°15'18", long 66°43'47", 6.10 Hydrologic Unit 21010001, at (15.8) barrio Guaonica 50 ft (15 m) off Highway 603, 0.5 mi (0.8 km) upstream from Rio Grande de Arecibo, 0.4 mi (0.6 km) downstream from Rio Roncador, and 2.2 mi (3.5 km) southwest of Dtuado plaza. Lat 18°15'40", long 66°43'19", 2.59 Hydrologic Unit 21010001, at (6.71) barrio Arenas on Highway 10, 200 ft (61 m) upstream from Rio Grande de Arecibo, and 1.5 mi (2.4 km) southwest of Dtuado plaza. Lat 18°15'46", long 66 043'15", 39.9 Hydrologic Unit 21010001, at (103) barrio Arenas, 200 ft (61 m) off Highway 10, 0.1 mi (0.2 km) downstream from Quebrada Arenas, 1.7 mi (2.7 km) upstream from Rio Vivi, and 1.4 (2.2 km) southwest from Utuado plaza. Lat 18012'52", long 66°40'25", 5.66 Hydrologic Unit 21010001, at (14.6) barrio Vivi Arriba on Highway 605, 2.0 mi (3.2 km) upstream from Lago Vivi, 2.1 mi (3.4 km) northeast from Lago Pellejas, and 1.3 mi (2.1 km) northwest from Cerro Prieto. Lat 18°13'10", long 66°35'12", 4.22 Hydrologic Unit 21010001, at (10.9) barrio Veguitas on Highway 144, 0.4 mi (0.6 km) upstream from Rio Grande de Jayuya, 1.6 mi (2.6 km) northwest of Hacienda Gripinas, and 0.5 mi (0.8 km) east of Jayuya plaza. Lat 180 13'01", long 66°36'28", 18.8 Hydrologic Unit 21010001, 1.5 (48.7) mi (2.4 km) downstream from Rio Caricaboa, 1.4 (2.2 km) upstream from Rio Zamas, 1.0 mi (1.6 km) southwest from Jayuya plaza. Lat 18°11'16", long 66°38'25", 4.44 Hydrologic Unit 21010001, at (11.5) barrio Jauca on Highway 140, 1.7 mi (2.7 km) southeast from Cerro Prieto, 4.6 mi (7.4 km) southeast from Lago Pellejas, and 3.8 mi (6.1 km) southwest of Jayuya. Lat 18°13'08", long 66 038'35", 7.14 Hydrologic Unit 21010001, at (18.5) barrio Paso Palma on Highway 140, 0.2 mi (0.3 km) upstream from Rio Grande de Jayuya, 2.5 mi (4.0 km) southeast from Lago Vivi, and 2.0 mi (3.2 km) south of Lago Caonillas. DATE 3/03/94 5/05/94 TIME 0745 0730 3/02/94 5/04/94 1005 1030 3/02/94 5/04/94 3/02/94 5/04/94 3/03/94 5/05/94 3/03/94 5/05/94 3/03/94 5/05/94 3/03/94 5/05/94 3/03/94 5/05/94 1025 0915 0945 0945 1005 0910 1420 1315 1330 1230 1235 1140 1130 1025 STREAM- PLOW ft3/s (m3/s) 5.31 (0.150) 3.25 (0.092) 5.22 (0.148) 3.81 (0.108) 1.49 (0.042) 1.12 (0.032) 10.8 (0.306) 7.45 (0.211) 4.27 (0.121) 2.31 (0.065) 1.33 (0.038) 0.56 (0.016) 6.62 (0.187) 3.42 (0.097) 4.17 (0.118) 1.89 (0.054) 4.61 (0.130) 2.52 (0.071) 406 STATION NUMBER 50026050 STATION NAME Rio Caonillas above Lago Caonillas, PR 50026250 Rio Limon on Highway 613 near Tetuan, PR 50026350 50026925 Rio Limon above confluence with Rio Yunes, PR Rio Yunes at Fronton, PR 50026950 Rio Yunes at mouth near Hameyes Abajo, PR 50027900 Rio Tanama near Caguana, PR 50028100 Rio Tanama above Observatorio de Arecibo, PR 50028200 Rio Tanama at Bsperanza, PR 50029800 Rio Grande de Manati near Barranguitas, PR DRAINAGE AREA mi 1 (km') TIME DISCHARGE AT PARTIAL-RECORD STATIONS Low-flow partial-record stations—Continued LOCATION AND BASIN Rio Grande de Arecibo basin Lat 18°14'26", long 66°38'22", 40.4 3/07/94 1340 Hydrologic Onit 21010001, at (105) barrio Caonillas Arriba, 300 4/22/94 0700 feet (91 m) off Highway 531, 700 ft (213 m) upstream from Lago Caonillas, and 3.3 mi (5.3 km) northwest of Jayuya plaza. Lat 18°16'57", long 66°35'52", 5.55 3/07/94 1230 Hydrologic Onit 21010001, at (14.4) barrio Tetuan on Highway 613, 4/22/94 0945 0.4 mi (0.6 km) upstream from Rio Naranjito, 1.3 mi (2.1 km) northwest from Cerro Magoyo, and 1.3 (2.1 km) from Bscuela Segunda Onidad de Mameyes. Lat 18°19'26", long 66°36'42 11 / 16.7 3/07/94 1115 Hydrologic Unit 21010001, 3.4 (43.2) mi (5.5 km) upstream from Lago 4/22/94 1150 Caonillas, 100 ft (30 m) upstream from Rio Yunes, and 4.0 mi (6.4 km) southwest of Florida plaza. Lat 18°18'11", long 66°34'09", 9.63 3/07/94 0925 Hydrologic Unit 21010001, at (24.9) barrio Fronton, 0.9 mi (1.4 km) 4/22/94 1030 southwest from Escuela Segunda Unidad de Fronton, 2.9 mi (4.7 km) northeast fron Cerro Magoyo, and 4.2 mi (6.8 km) of Florida Plaza. Lat 18°19'30", long 66 0 36'39", 13.5 3/07/94 1035 Hydrologic Unit 21010001, 3.4 (35.0) mi (5.5 km) upstream from Lago 4/22/94 1120 Caonillau, 100 ft (30 m) upstream from Rio Linon, 1.5 mi (2.4 km) northwest from Hacienda Piedra Gorda, and 4.0 mi (6.4 km) southwest of Florida plaza. Lat 18°15'42", long 66°46'55", 10.8 2/25/94 0815 Hydrologic Unit 21010001, near (30.0) barrio Caguana, 4.4 mi (7.1 km) 4/18/94 1230 upstream from Highway 111, 2.5 mi (4.0 km) south of Pargue Ceremonial Indigena Caguana, and 2.1 mi (3.4 km) southeast of comunidad Angeles. Lat 18 020'22", long 66°45'25 11 , Indeter- 3/01/94 1735 Hydrologic Unit 21010002, at minate barrio Bsperanza, 0.5 mi 4/18/94 1040 (0.8 km) southwest from the Observatorio de Arecibo, 3.2 mi (5.1 km) southeast of comunidad Bayaney, and 3.2 mi (5.1 km) northeast of Pargue Ceremonial Indigena Caguana. Lat 18°22'45", long 66 0 44'02 B , Indeter- 2/22/94 1135 Hydrologic Unit 21010002, at minate barrio Esperanza, 0.9 mi (1.4 4/18/94 0930 km) upstream from Highway 623, 200 ft upstream of AAA intake, 3.2 mi (5.1 km) west from Rio Grande de Arecibo, and 6.7 mi (11 km) southwest from Arecibo plaza. Rio Grande de Manati basin Lat 18°14'00", long 66°18'53", 3.81 3/09/94 1205 Hydrologic Unit 21010001, at (9.87) barrio Barrancas, 300 ft (91 m) 4/19/94 1130 east of Highway 771, 2.4 mi (3.9 km) northeast from Cerro La Torrecilla, 0.7 mi (1.1 km) southwest of Cerro El Faralion, and 3.1 mi (5.0 km) from Barranguitas plaza. STREAM- FLOW ftVs (m'/s) 14.4 (0.408) 12.8 (0.362) 3.96 (0.112) 4.16 (0.118) 14.8 (0.419) 6.73 (0.190) 9.07 (0.257) 2.39 (0.068) 11.3 (0.320) 3.86 (0.109) 9.11 (0.258) 10.8 (0.306) 27.0 (0.765) 26.9 (0.762) 37.7 (1.068) 42.8 (1.212) 2.07 (0.059) 2.41 (0.068) STATION NUMBER STATION NAME 50029900 Rio Grande de Manati near Corozal, PR 50030250 Rio Botijas near Carro, PR 50030300 Rio Botijas near Botijas, PR 50030600 Rio Orocovis at Orocovis, PR 50031500 Rio Sana Muerto near Orocovis, PR 50032050 Quebrada Riachuelo at mouth, PR 50032100 Quebrada Grande near Morovis, PR 50032400 Rio Toro Negro on Highway 157 at Cacaos, PR 50032700 Rio Matrullas at mouth, PR DISCHARGE AT PARTIAL-RECORD STATIONS Low-flow partial-record stations—Continued LOCATION AND BASIN Rio Grande de Manati basin 407 DRAINAGE AREA (km') Lat 18<>16'48", long 66<>20'03", 13.2 3/09/94 Hydrologic Unit 21010001, at (34.2) barrio Negros on Highway 568, 4/19/94 0.2 mi (0.3 km) upstream from Highway 568, 1.7 mi (2.7 km) northeast of El Salto Grande, and 4.4 mi (7.1 km) southwest of Corozal plaza. Lat 18<>11'45", long 66021'09", 3.82 3/10/94 Hydrologic Unit 21010001, at (9.89) barrio Palo Hincado, 200 ft 4/20/94 (61 m) upstream from Highway 156, 100 ft (30 m) upstream from pumping station intake, 1.4 mi (2.2 km) southwest from Cerro La Torrecilla, and 3.1 mi (5.0 km) west of Barranquitas plaza. Lat 18°14'15", long 66<>22'36", 12.5 3/10/94 Hydrologic Unit 21010001, at (32.4) barrio Botijas on Highway 548, 4/20/94 0.5 mi (0.8 km) upstream from Rio Orocovis, 0.8 mi (1.3 km) north from Highway 156, and 1.1 mi (1.8 km) northeast of Orocovis plaza. Lat 18°13'58", long 66023'23", 8.78 3/10/94 Hydrologic Unit 21010001, at (22.7) Orocovis, 0.5 mi (0.8 km) 4/20/94 downstream from Quebrada Los Saltos, 1.3 mi (21 km) upstream from Rio Botijas, and 0.3 mi (0.5 km) northeast of Orocovis plaza. Lat 18<>16'14", long 66°24'47", 3.68 3/10/94 Hydrologic Unit 21010001, at (9.53) barrio Pesas, 2.5 mi (4.0 km) 4/21/94 southwest from Cerro Magueyes, 2.5 mi (4.0 km) upstream from Rio Grande de Manati, and 4.0 mi (6.4 km) south of Morovis plaza. Lat 18<>18'18", long 66<>26'15". 1.69 3/09/94 Hydrologic Unit 21010001, at (4.38) barrio San Lorenzo, 50 ft 4/19/94 (15 m) off Highway 567, 0.2 (0.3 km) upstream from Rio Grande de Manati, 1.0 mi (1.6 km) north from Cerro Avispa, and 2.5 mi (4.0 km) southwest of Morovis plaza. Lat 18<>18'45", long 66026'40", 2.63 3/09/94 Hydrologic Unit 21010001, at (6.81) barrio San Lorenzo, 50 ft 4/19/94 (15 m) off Highway 567, 0.6 mi (1.0 km) upstream from Rio Grande de Manati, 2.3 mi (3.7 km) southeast from Ciales, and 2.6 (4.2 km) southwest from Morovis plaza. Lat 18°13'57", long 66<>30'46", 11.8 3/08/94 Hydrologic Unit 21010001, at (30.6) barrio Cacaos on Highway 157, 4/21/94 0.5 mi (0.8 km) upstream from Quebrada Palma, 2.2 mi (3.5 km) northeast of Los Tres Picachos, and 5.3 mi (8.5 km) northeast of Jayuya plaza. Lat 18°15'29", long 66°30'04", 3.66 3/08/94 Hydrologic Unit 21010001 at (9.48) barrio Cacaos, 100 ft (30 m) 4/21/94 upstream from Rio Toro Negro, 0.8 mi (1.3 km) east from Cerro Vista Alegre, and 2.6 mi (4.2 km) south from Cerro Gordo. TIME 0945 1215 1210 0740 0955 0845 0900 0920 0700 1215 0715 0845 0635 0910 1040 0830 1245 0940 STREAM- FLOW ft3 /s 7.79 (0.221) 1.48 (0.042) 1.00 (0.028) 1.04 (0.029) 5.02 (0.142) 3.50 (0.099) 3.33 (0.094) 3.22 (0.091) 1.29 (0.036) 0.99 (0.028) 0.80 (0.023) 0.70 (0.020) 0.87 (0.025) 0.75 (0.021) 4.09 (0.116) 4.64 (0.131) 1.60 (0.045) 0.94 (0.027) 408 STATION NUMBER STATION NAME 50033000 Rio Toro Negro near Ciales, PR 50033500 Rio Bauta near Divisor!a, PR 50034500 Rio Bauta at Pozas, PR 50035600 Rio Cialitos at Cialitos, PR 50035700 50035950 Rio Cialitos on Highway 614 near Ciales, PR Rio Cialitos on Highway 649 at Ciales, PR 50037200 Rio Grande de Manati near Hanati, PR 50038295 Rio de Los Negroe at mouth at Corozal, PR 50038302 Rio Corozal above sewage plant at Corozal, PR DISCHARGE AT PARTIAL-RECORD STATIONS Low-flow partial-record stations—Continued LOCATION AND BASIN DRAINAGE AREA (km>) Rio Grande de Hanati basin Lat 18°17'20", long 66°29'06", 25.2 Hydrologic Unit 21010001, at (65.3) barrio Toro Negro on Highway 615, 0.6 mi (1.0 km) south from Bscuela Segunda Dnidad de Pesas, 2.3 mi (3.7 km) north- west from Cerro Cedro, and 3.7 mi (6.0 km) southwest from Ciales plaza. Lat 18°11'45", long 66°26'30", 8.60 Hydrologic Unit 21010001, at (22.3) barrio Bauta Abajo, 2.6 mi (4.2 km) southeast from Lago Matrullas, 1.9 mi (3.1 km) northeast from Cerro El Halo, 4.0 mi (6.4 km) southwest of Orocovis plaza. Lat 18°17'47", long 66°27'35", 28.2 Hydrologic Unit 21010001, at (73.0) barrio Pozas, 100 ft (30 m) upstream from Rio Toro Negro, 4.0 mi (6.4 km) southwest of Morovis, and 2.9 mi (4.7 km) southeast of Ciales plaza. Lat 18°14'29", long 66°31'30", 3.18 Hydrologic Unit 21010001, at (8.24) barrio Cialitos, 0.3 mi (0.5 km) north of Highways 149 and 566 intersection, 2.0 mi (3.2 km) northeast from Los Tres Picaches, and 4.7 mi (7.6 km) northeast of Jayuya plaza. Lat 18°17'13 H , long 66030'53' f 6.66 Hydrologic Unit 21010001, at (17.2) barrio Pesas on Highway 614, 1.0 mi (1.6 km) southwest from Cerro Gordo, 1.8 mi (2.9 km) north of Cerro Vista Alegre, and 6.4 mi (10 km) southeast of Florida plaza. Lat 18°20'18 H , long 66°28'28", 17.0 Hydrologic Unit 21010001, at (44.0) Ciales, 100 ft (30 m) upstream from bridge on Highway 649, 0.7 mi (1.1 km) upstream from Rio Grande de Manati, and 0.4 mi (0.6 km) west of Ciales plaza. Lat 18°24'52", long 66°29'37 H , Indeter- Hydrologic Unit 21010002, at minate barrio Rio Arriba Poniente, 100 ft (30 m) off Highway 149, 1.2 mi (1.9 km) southwest of comunidad Sabana Seca, 5.1 mi (8.2 km) upstream from Highway 2, and 1.0 mi (1.6 km) south of Manati plaza. Rio Cibuco basin Lat 18°20'29", long 66°19'08", 4.04 Hydrologic Unit 21010001, at (10.5) Corozal, 100 ft (30 m) upstream from Rio Corozal, 0.3 mi (0.5 km) upstream from Highway 159, and 0.1 mi (0.2 km) southwest of Corozal plaza. Lat 18°20'52", long 66oi9'43", 9.75 Hydrologic Unit 21010001, at (25.2) barrio Cibuco, 0.8 mi (1.3 km) upstream from Rio Cibuco, 0.7 mi (1.1 km) downstream from Highway 159, and 0.8 mi (1.3 km) northwest of Corozal plaza. DATE 3/08/94 4/21/94 TIME 1400 1045 2/28/94 4/06/94 3/08/94 4/06/94 3/08/94 4/18/94 3/08/94 4/18/94 3/08/94 4/18/94 3/28/93 4/18/94 6/10/94 0945 1320 1500 1030 0950 1015 0845 1050 0630 0900 1030 0805 0920 3/04/94 4/11/94 3/04/94 4/11/94 0900 1330 0640 1000 STREAM- PLOW ft3/s (mVs) 8.89 (0.252) 7.19 (0.204) 5.01 (0.142) 2.30 (0.065) 6.55 (0.185) 10.2 (0.289) 1.67 (0.047) 1.62 (0.046) 3.60 (0.102) 3.03 (0.086) 7.12 (0.202) 3.89 (0.110) 52.6 (1.490) 68.8 (1.948) 40.4 (1.144) 1.36 (0.039) 1.54 (0.044) 4.49 (0.127) 7.30 (0.207) STATION NUMBER 50038317 STATION NAME Rio Cibuco at Cibuco, PR 50038345 Rio Mavilla on Highway 164 near Corozal, PR 50038375 50038420 50038550 50038590 50038650 50038718 50038750 Rio Mavilla on Highway 821 near Maricao, PR Rio Cibuco on Highway 620 near Vega Alta, PR Rio Unibon above sewage plant at Unibon, PR Rio Las Carreras at Unibon near Morovis, PR Rio Unibon off Highway 160 near Almirante Sur, PR Rio Morovis above sewage plant near Morovis, PR Quebrada Grande de Morovis on Highway 634 near Morovis, PR DISCHARGE AT PARTIAL-RECORD STATIONS Low-flow partial-record stations—Continued LOCATION AND BASIN Rio Cibuco basin 409 DRAINAGE AREA mi* (km*) Lat 18020'54", long 66°20'09", 5.05 Hydrologic Unit 21010001, at (13.1) barrio Cibuco, 0.3 mi (0.5 km) upstream from Rio Corozal, 1.8 mi (2.9 km) southeast from Bscuela Cienegueta, and 1.3 mi (2.1 km) northwest of Corozal plaza. Lat 18°19'07", long 66°17'21", 7.78 Hydrologic Unit 21010001, at (20.2) barrio Palmarejo on Highway 164, 0.6 mi (1.0 km) southwest from Bscuela Segunda Unidad de Palmarejo, 1.3 mi (2.1 km) downstream from Quebrada La Jacinta, and 2.5 mi (4.0 km) southeast of Corozal plaza. Lat 18°22'11", long 66°20'02", 16.5 Hydrologic Unit 21010002, at (42.7) barrio Abras on Highway 821, 1.4 mi (2.2 km) upstream from Rio Cibuco, 1.3 mi (2.1 km) southwest from Cerro Santa Barbara, and 2.2 mi (3.5 km) northwest of Corozal plaza. Lat 18°24'08", long 66°20'39", 38.8 Hydrologic Unit 21010001, at (100) barrio Candelaria on Highway 620, 3.6 mi (5.8 km) down- stream from Rio Mavilla, 6.2 mi (10 km) northwest from Toa Alta, and 1.2 mi (1.9 km) southwest of Vega Alta plaza. Lat 18°20'00", long 66°22'18", 1.63 Hydrologic Unit 21010001, at (4.22) barrio Unibon, 0.7 mi (1.1 km) upstream from Rio Las Carreras, 2.5 mi (4.0 km) northeast from Morovis, and 3.6 mi (5.8 km) southwest of Corozal plaza. Lat 18°19'36", long 66°22'47", 2.65 Hydrologic Unit 21010001, at (6.86) barrio Unibon, 1.3 mi (2.1 km) upstream from Highway 159, 2.8 mi (4.5 km) northeast of Cerro Quiros, and 1.9 mi (3.1 km) east of Morovis plaza. Lat 18°21'05", long 66°23'12", 7.52 Hydrologic Unit 21010002, at (19.5) barrio Almirante Sur, 0.4 mi (0.6 km) downstream from Quebrada Monte Llano, 1.9 mi (3.1 km) upstream from Rio Morovis, and 2.2 mi (3.5 km) northeast of Morovis plaza. Lat 18°20'12", long 66°25'15", 2.72 Hydrologic Unit 21010002, at (7.04) barrio Horovis Norte, 0.3 mi (0.5 km) upstream of Highway 155, 3.1 mi (5.0 km) east of Ciales, and 1.0 mi (1.6 km) northwest of Horovis plaza. Lat 18°21'33", long 66°24'39", 7.41 Hydrologic Unit 21010002, at (19.2) barrio Franquez, 0.8 mi (1.3 km) upstream from Rio Morovis, 4.1 mi (6.6 km) northeast from Ciales, and 2.2 mi (3.5 km) north of Morovis plaza. DATE 3/04/94 4/11/94 3/04/94 4/11/94 TIME 0955 1155 1050 1435 3/22/94 4/12/94 3/22/94 4/12/94 4/12/94 0630 0750 0735 0850 1525 3/22/94 4/12/94 3/22/94 4/12/94 3/22/94 4/12/94 3/21/94 4/12/94 1300 1440 1010 1210 1115 1305 1255 1400 STREAM- PLOW ft'/s (m'/s) 2.20 (0.062) 2.57 (0.073) 6.27 (0.178) 7.67 (0.217) 6.16 (0.174) 14.6 (0.413) 14.0 (0.396) 32.7 (0.926) 0.57 (0.016) 0.57 (0.016) 1.88 (0.053) 0.54 (0.015) 3.13 (0.089) 2.92 (0.083) 1.84 (0.052) 0.05 (0.001) 0.08 (0.002) 4 10 STATION NUMBER 50038895 STATION NAME Rio Indio on Highway 22 at Rio Abajo, PR 50040500 50040590 Rio de La Plata on Highway 738 near Cayey, PR Rio Guavate on Highway 52 near Cayey/ PR 50040700 50041010 50041020 Quebrada Beatriz on Highway 1 near Cayey, PR Rio de La Plata on Highway 171 near Cayey, PR Quebrada Santo Domingo at Cayey, PR 50042800 Rio Maton on Highway 14 at Maton Abajo, PR 50043010 Quebrada Honda at mouth at Proyecto La Plata, PR 50043197 Rio Usabon on Highway 162 near Barranquitas, PR DISCHARGE AT PARTIAL-RECORD STATIONS Low-flow partial-record stations—Continued LOCATION AND BASIN DRAINAGE AREA (km') Lat 18°25'47", long 66°22'55", Indeter- Hydrologic Unit 21010002, at minate barrio Rio Abajo on Highway 22, 1.2 mi (1.9 km) south from Highway 2, 7.2 mi (12 km) east of Manati, and 3.6 mi (5.8 km) northwest of Vega Alta plaza. Rio de La Plata basin Lat 18°07'25", long 66°07'56", 13.4 Hydrologic Unit 21010005, at (34.7) barrio Monte Llano on Highway 738, 100 ft (30 m) upstream from pumping station intake, 0.5 mi (0.8 km) southwest of Central Cayey, and 2.6 mi (4.2 km) northeast of Cayey plaza. Lat 18°07'51", long 66°07'04", 6.62 Hydrologic Unit 21010005, at (17.1) barrio Vegas, 1.2 mi (1.9 km) upstream from Rio de La Plata, 2.9 mi (4.7 km) southwest from Cerro Las Pinas, and 4.3 mi (6.9 km) southeast of Cidra plaza. Lat 18°08'30", long 66°06'57", 3.42 Hydrologic Unit 21010005, at (8.86) barrio Beatriz on Highway 1, 2.2 mi (3.5 km) upstream from Rio de La Plata, 2.5 mi (4.0 km) southwest from Cerro Las Pinas, and 3.9 mi (6.3 km) southeast of Cidra plaza. Lat 18°08'07", long 66°10'08", 34.2 Hydrologic Unit 21010005, at (88.6) barrio Rincon on Highway 171, 0.8 mi (1.3 km) northwest from Cerro La Guasima, 250 ft (76 m) upstream from Quebrada Santo Domingo, and 3.0 mi (4.8 km) southwest of Cidra plaza. Lat 18°06'22", long 66°09'55", 0.84 Hydrologic Unit 21010005, at (2.18) Cayey on Highway 1, 3.2 mi (5.1 km) northeast from Cerro Planada, 1.7 mi (2.7 km) north- east from Monte El Gato, and 0.5 mi (0.8 km) southeast of Cayey plaza. Lat 18°08'29», long 66°12'40", 6.63 Hydrologic Unit 21010005, at (17.2) barrio Maton Abajo on Highway 14, 250 ft (76 m) upstream of Rio de La Plata, 1.0 mi (1.6 km) south of Cerro Plana, and 4.1 mi (6.6 km) southwest of Cidra plaza. Lat 18°09'36", long 66°13'48", 2.66 Hydrologic Unit 21010005, at (6.89) barrio Plata, 100 ft (30 m) upstream from Rio de La Plata, 1.3 mi (2.1 km) northwest from Cerro Plana, 0.9 mi (1.4 km) from Cerro Amoldadero, and 4.7 mi (7.6 km) southwest of Cidra plaza. Lat 18°09'41", long 66°18'26", 8.56 Hydrologic Unit 21010005, at (22.2) barrio Helechal on Highway 162, 2.1 mi (3.4 km) northeast from Cerro Pulguillas, 3.0 mi (4.8 km) northwest from Aibonito, and 1.8 mi (2.9 km) south of Barranquitas plaza. DATE 4/21/94 4/12/94 3/01/94 4/26/94 6/03/94 3/01/94 4/26/94 6/03/94 3/01/94 4/26/94 6/03/94 2/28/94 4/26/94 6/07/94 2/28/94 4/26/94 6/07/94 2/28/94 4/14/94 6/07/94 2/28/94 4/14/94 6/07/94 3/23/94 4/07/94 6/02/94 TIME 1110 1105 0845 0920 0930 0700 0700 1050 0802 1020 0850 1130 1120 0810 1035 0835 0920 0930 1350 1000 0840 1300 1110 1130 1145 1230 STREAM- FLOW ft'/s (mVs) 5.92 (0.168) 10.8 (0.306) 17.8 (0.504) 3.83 (0.108) 10.0 (0.283) 6.31 (0.179) 1.84 (0.052) 1.46 (0.041) 2.30 (0.065) 0.80 (0.023) 0.52 (0.015) 0.44 (0.012) 0.43 (0.012) 14.9 (0.422) 0.33 (0.009) 0.17 (0.005) 0.10 (0.003) 1.33 (0.038) 1.61 (0.046) 0.93 (0.026) 0.39 (0.011) 0.63 (0.018) 0.28 (0.008) 1.45 (0.041) 2.98 (0.084) 0.76 (0.022) STATION NUMBER 50043450 STATION NAME Rio Aibonito at Llanos near Aibonito, PR 50043475 Rio Barranquitae at Barranquitae, PR 50043575 Rio Hondo on Highway 776 at Rio Hondo, PR 50043850 50043950 Rio Arroyata on Highway 171 at Cidra, PR Rio Arroyata on Highway 775 near Cidra, PR 50043998 Rio Arroyata at mouth near Comerio, PR 50044300 50044775 50044975 Rio Cueeta Arriba on Highway 816 at Nuevo, PR Rio Guadiana above sewage plant at Naranjito, PR Rio Canae at Achiote near Naranjito, PR DRAINAGE AREA mi' (km') DISCHARGE AT PARTIAL-RECORD STATIONS Low-flow partial-record stations--Continued LOCATION AND BASIN Rio de La Plata basin Lat 18°09'19", long 66°17'07", 6.48 Hydrologic Unit 21010005, at (16.8) barrio Llanos, 2.1 mi (3.4 km) southeast from Canon de San Cristobal, 2.7 mi (4.3 km) southeast from Barranguitas, and 1.5 mi (2.4 km) northwest of Aibonito plaza. Lat 18»11'19", long 66°18'15", 3.75 Hydrologic Unit 21010005, at (9.71) Barranquitas, 0.1 mi (0.2 km) upstream from Highway 156, 2.1 mi (3.4 km) southeast from Cerro La Torrecilla, 1.6 mi (2.6 km) northwest from Canon de San Cristobal, and 0.2 mi (0.3 km) east of Barrranquitas. Lat 18°13'18", long 66°15'07" 9.07 Hydrologic Unit 21010005, at (23.5) barrio Rio Hondo on Highway 776, 0.4 mi (0.6 km) north of Escuela Segunda Unidad de Rio Hondo, 4.3 mi (6.9 km) north- east of Barranquitas, and 4.4 mi (7.1 km) northeast of Cation de San Cristobal. Lat 18°10'16", long 66<>09'44", 0.70 Hydrologic Unit 21010005, at (1.81) barrio Sud on Highway 171, 0.8 mi (1.3 km) southwest from Lago Cidra, 2.8 mi (4.5 km) northeast from Cerro Gordo, and 0.5 mi (0.8 km) south of Cidra plaza. Lat 18°12'04'', long 66°12'34", 9.42 Hydrologic Unit 21010004, at (24.4) barrio Vega Redonda on Highway 775, 1.5 mi (2.4 km) of Cerro Almirante, 1.6 mi (2.6 km) north of Cerro Viento Caliente, and 1.8 mi (2.9 km) southeast of Comerio plaza. Lat 18°14'26", long 66°12'32", 16.2 Hydrologic Unit 21010005, at (42.0) barrio Naranjo on Highway 156, 150 ft (46 m) upstream from Rio de La Plata, 1.6 mi (2.6 km) southwest from Cerro La Tiza, 1.8 mi (2.9 km) northeast of Comerio plaza. Lat 18»17'56», long 66°12'24", 5.51 Hydrologic Unit 21010005, at (14.3) barrio Nuevo on Highway 816, 0.3 mi (0.5 km) upstream from Rio de La Plata, 1.3 mi (2.1 km) northeast of Cerro Avispa, and 2.6 mi (4.2 km) southeast of Naranjito plaza. Lat 18°18'08", long 66°14'18", 5.42 Hydrologic Unit 21010005, at (14.2) barrio Guadiana, 0.2 mi (0.3 km) upstream from Quebrada Anones, 1.7 mi (2.7 km) from Cerro Avispa, and 0.6 mi (1.0 km) east of Naranjito plaza. Lat 18°19'21", long 66°15'14", 3.14 Hydrologic Unit 21010005, at (8.13) barrio Achiote, 1.7 mi (2.7 km) upstream from Lago La Plata, 1.5 mi (2.4 km) northwest from Naranjito plaza, and 4.5 mi (7.2 km) southeast of Corozal plaza. 411 DATE 3/23/94 4/07/94 6/02/94 3/23/94 4/07/94 6/02/94 3/25/94 4/08/94 6/01/94 3/23/94 4/07/94 6/02/94 3/23/94 4/07/94 6/02/94 3/23/94 4/07/94 6/02/94 3/25/94 4/08/94 6/01/94 3/24/94 4/13/94 6/01/94 3/24/94 4/13/94 6/01/94 TIME 1250 1040 1130 1350 1310 1335 0740 0730 1320 0950 0940 0935 0850 0840 0840 0750 0745 0745 0920 0845 1110 1155 1325 0850 0945 1135 0755 STREAM- FLOW ft'/s (mVs) 2.05 (0.058) 2.46 (0.070) 2.23 (0.063) 1.36 (0.038) 1.27 (0.036) 1.02 (0.029) 3.63 (0.103) 3.63 (0.103) 3.01 (0.085) 0.17 (0.005) 0.12 (0.003) 0.07 (0.002) 2.75 (0.078) 2.38 (0.067) 1.04 (0.029) 4.50 (0.127) 5.11 (0.145) 1.65 (0.047) 1.59 (0.045) 1.71 (0.048) 1.24 (0.035) 2.03 (0.057) 3.61 (0.102) 1.09 (0.031) 0.70 (0.020) 1.14 (0.032) 0.46 (0.013) 412 STATION NUMBER STATION NAME DISCHARGE AT PARTIAL-RECORD STATIONS Low-flow partial-record stations—Continued LOCATION AND BASIN DRAINAGE AREA mi* (km») DATE TIME STREAM- FLOW ft5 /* (m3/s) 50045100 Quebrada Cruz on Highway 824 near Toa Alta, PR 50045400 Rio Bucarabones near Toa Alta, PR 50045800 Rio Lajas at Toa Alta, PR 50047475 50047520 Quebrada Cerro Gordo at La Aldea at Bayamon, PR Rio Hondo II at Sabana Seca, PR 50047598 Quebrada Vicente at mouth, PR 50047600 Rio Bayamon near Aguas Buenas, PR 50047750 Quebrada Grande near Aguas Buenas, PR Lat 18«21'26", long 66°14'50", 2.13 3/24/94 0640 0.38 Hydrologic Unit 21010005, at (5.52) (0.011) barrio Quebrada Cruz on High- 4/13/94 0715 0.66 way 824, 0.3 mi (0.5 km) up- (0.019) stream from Rio de La Plata, 1.1 mi (1.8 km) northwest from Lago La Plata spillway, and 3.7 mi (6.0 km) north of Naranjito plaza. Lat 18021'49", long 66°12'54", 1.23 3/24/94 0740 0.75 Hydrologic unit 21010005, at (3.19) (0.021) barrio Ortiz, 4.7 mi (7.6 km) 4/13/94 0810 0.88 northeast from Naranjito, 3.1 (0.025) mi (5.0 km) northwest from Cerro Gordo Arriba, and 2.8 mi (4.5 km) southeast of Toa Alta plaza. Lat 18°23'39", long 66°15'16 M , 8.60 3/24/94 0845 1.50 Hydrologic Unit 21010005, at (22.3) (0.042) Toa Alta on Highway 165, 0.2 4/13/94 0905 2.32 mi (0.3 km) upstream from Rio (0.066) de La Plata, 1.8 mi (2.9 km) downstream of Quebrada Arenas, and 0.3 mi (0.5 km) northwest of Toa Alta plaza. Rio Bayamon basin Lat 18«22'38", long 66°10'31", 2.15 3/03/94 1200 2.21 Hydrologic Unit 21010005, at (5.57) (0.062) barrio Cerro Gordo on Highway 4/25/94 0955 0.63 840, 1.2 mi (1.9 km) upstream (0.018) of Rio Hondo, 4.9 mi (7.9 km), southeast from Toa Alta, and 2.0 mi (3.2 km) southwest of Bayamon plaza. Lat 18«25'24», long 660 11'07" 2.59 3/04/94 1235 0.78 Hydrologic Unit 21010005, at (6.71) (0.022) barrio Sabana Seca, 1.2 mi 4/25/94 0900 0.47 (1.9 km) northwest from Puerto (0.013) Rico National Cemetery, 4.7 mi (7.6 km) northeast of Toa Alta, and 2.5 mi (4.0 km) northwest of Bayamon plaza. Lat 18«14'36", long 66°08'41', 2.21 3/01/94 1100 2.33 Hydrologic Unit 21010005, at (5.72) (0.066) barrio Bayamoncito off Highway 5/02/94 1010 0.93 156, 100 ft (30 m) upstream (0.026) from Rio Bayamon, 1.2 mi (1.9 6/09/94 1145 0.72 km) northeast from Cerro Santa (0.020) Barbara, and 4.6 mi (7.4 km) northeast of Cidra plaza. Lat 18°14'39", long 66°08'39", 10.2 3/01/94 1035 18.8 Hydrologic Unit 21010005, at (26.4) (0.532) barrio Bayamoncito on Highway 5/02/94 1045 19.0 156, 1.3 mi (2.1 km) southwest (0.538) from Cerro Santa Barbara, 2.7 6/09/94 1220 7.58 mi (4.3 km) east from Cerro (0.215) La Tiza, and 4.7 mi (7.6 km) northeast of Cidra plaza. Lat 18°16'02", long 66008'33", 4.08 3/02/94 1015 4.62 Hydrologic Unit 21010005, at (10.6) (0.131) barrio Juan Asencio, 0.2 mi 5/02/94 0905 2.24 (0.3 km) upstream from Rio (0.063) Bayamon, 0.7 mi (1.1 km) 6/09/94 1015 1.58 southeast from Cerro Hula, 1.0 (0.045) mi (1.6 km) southwest from Cerro del Chicharo, and 2.6 mi (4.2 km) northwest of Aguas Buenas plaza. DISCHARGE AT PARTIAL-RECORD STATIONS 413 Low-flow partial-record stations--Continued STATION NUMBER 50047810 STATION NAME Quebrada Sonadora at Sonadora, PR 50047840 50047860 50047870 Quebrada Santa Olaya on Highway 174 near Bayamon, PR Rio Minillas on Highway 174 near Minillas, PR Rio Bayamon near Minillas, PR 50047895 50047953 Rio Guaynabo at Highway 836 near Guaynabo, PR Rio Guaynabo below Guaynabo, PR 50047970 Quebrada Frailes on Highway 169 at Guaynabo, PR 50048750 50048760 Quebrada Las Curias Tributary near Caimito, PR Quebrada Los Guanos near Rio Piedras, PR LOCATION AND BASIN Rio Bayamon basin Lat 18°17'47", long 66°07'58", Hydrologic Unit 21010005, at barrio Sonadora, 0.7 mi (1.1 km) upstream from Rio Bayamon, 1.4 mi (2.2 km) northeast from Cerro La Pena, 1.2 mi (1.9 km) north from Cerro del Chicharo, and 3.2 mi (5.1 km) northwest of Aguas Buenas plaza. Lat 18°19'46", long 66°08'35", Hydrologic Unit 21010005, at barrio Guaraguao Abajo on Highway 174, 0.1 mi (0.2 km) upstream from Rio Bayamon, 1.2 mi (1.9 km) northeast of Cerro de Vergara, and 2.9 mi (4.7 km) southwest of Guaynabo plaza. Lat 18°21'34", long 66°08'38", Hydrologic Unit 21010005, at barrio Minillas on Highway 174, 0.1 mi (0.2 km) upstream from Rio Bayamon, 2.1 mi (3.4 km) northeast from Cerro Gordo Arriba, and 2.9 mi (4.7 km) southeast of Bayamon plaza. Lat 18°21'53", long 66°08'30", Hydrologic Unit 21010005, at barrio Minillas, 1.3 mi (2.1 km) upstream from Rio Guaynabo, 2.4 mi (3.9 km) northeast from Cerro Gordo Arriba, and 2.6 mi (4.2 km) southeast of Bayamon plaza. Lat 18°20'05", long 66°06'10", Hydrologic Unit 21010005, at barrio Mantey on Highway 836, 0.6 mi (1.0 km) southwest of Cerro Magueyes, 3.7 mi (6.0 km) from Cerro Marquesa, and 1.8 mi (2.9 km) southeast of Guaynabo plaza. Lat 18°22'00", long 66°07'09", Hydrologic Unit 21010005, at barrio Santa Rosa, 0.4 mi (0.6 km) upstream from Quebrada Frailes, 3.1 mi (5.0 km) north- west from Cerro Magueyes, and 0.7 mi (1.1 km) northwest from Guaynabo plaza. Lat 18°22'07", long 66°06'42", Hydrologic Unit 21010005, at Guaynabo on Highway 169, 1.9 mi (3.1 km) northwest from Cerro Magueyes, 1.2 mi (1.9 km) upstream from Rio Guaynabo, and 0.6 mi (1.0 km) north from Guaynabo plaza. Rio Piedras basin Lat 18 020'19 1> / long 66°03'33", Hydrologic Unit 21010005, at barrio Caimito, 0.7 mi (1.1 km) upstream from Quebrada Las Curias, 0.7 mi (1.1 km) south- west from Aljibe Las Curias, and 2.9 mi (4.7 km) northwest of Lago Carraizo spillway. Lat 18°21'24", long 66°03'20", Hydrologic Unit 21010005, at barrio Cupey, 0.8 mi (1.3 km) upstream from Rio Piedras, 3.2 mi (5.1 km) northwest from Lago Carraizo spillway, and 3.1 mi (5.0 km) west of Trujillo Alto plaza. DRAINAGE AREA (km') 2.60 (6.73) 4.10 (10.6) 4.80 (12.4) 40.8 (106) 8.44 (21.9) 12.8 (33.2) 3.48 (9.01) 1.73 (4.48) 0.76 (1.97) DATE 3/03/94 4/15/94 6/09/94 3/02/94 4/15/94 6/09/94 3/02/94 4/15/94 6/08/94 3/02/94 4/15/94 6/08/94 3/03/94 4/25/94 6/08/94 3/03/94 4/25/94 6/08/94 3/03/94 4/25/94 6/08/94 3/04/94 5/03/94 3/04/94 5/03/94 TIME 0650 0730 0925 0915 0830 0840 1150 1005 0905 1225 1050 0950 0905 1135 1340 0950 1225 1240 1025 1315 1140 0815 1100 0905 1010 STREAM- FLOW ft'/s (mVs) 1.67 (0.047) 2.42 (0.068) 1.07 (0.030) 1.69 (0.048) 1.85 (0.052) 0.93 (0.026) 8.51 (0.241) 3.77 (0.107) 1.36 (0.038) 20.6 (0.583) 14.6 (0.413) 6.27 (0.178) 4.68 (0.132) 2.74 (0.078) 1.56 (0.044) 7.68 (0.217) 4.55 (0.129) 2.85 (0.081) 3.00 (0.085) 6.30 (0.178) 2.39 (0.068) 0.84 (0.024) 0.43 (0.012) 0.59 (0.017) 0.41 (0.012) 4 14 STATION NUMBER STATION NAME 50146700 Rio Culebrinas at Perchas No. 1, PR 50147000 Rio Culebrinas at San Sebastian, PR 50147200 Rio Guatemala at San Sebastian, PR 50147400 Rio Sonador near San Sebastian, PR 50147796 Quebrada Los Morones near Moca, PR 50147997 50148500 Quebrada Grande near Moca, PR Rio Canas near Aguada, PR DISCHARGE AT PARTIAL-RECORD STATIONS Low-flow partial -record stations --Continued LOCATION AND BASIN Rio Culebrinas basin DRAINAGE AREA (km>) Lat 18°18'09", long 66°56'49", 6.82 Hydrologic Unit 21010003, at (17.7) barrio Perchas No. 1, 1.4 mi (2.2 km) upstream of Quebrada Lajas, 1.2 mi (1.9 km) down- stream from Quebrada Grande, and 3.8 mi (6.1 km) southeast of San Sebastian plaza. Lat 18 020'08", long 66°59'46", 16.7 Hydrologic Unit 21010003, at (43.2) San Sebastian on Highway 109, 0.9 mi (1.4 km) upstream from Rio Guatemala, 200 ft (61 m) upstream from sewage plant discharge point, and 0.4 mi (0.6 km) southwest from San Sebastian plaza. Lat 18°20'42', long 67°00'00", 10.3 Hydrologic Unit 21010003, at (26.7) San Sebastian on Highway 111, 1.2 mi (1.9 km) upstream from Rio Culebrinas, 0.9 mi (1.4 km) southeast of Central La Plata, and 0.7 mi (1.1 km) northeast of San Sebastian plaza. Lat ISoiS^g", long 67°00'29", 6.09 Hydrologic Unit 21010003, at (15.8) barrio Culebrinas on Highway 109, 1.3 mi (2.1 km) northeast from Cerro Yaitini, 2.1 mi (3.4 km) northeast from Cerro Cascajillo, and 2.0 mi (3.2 km) southwest from San Sebastian plaza. Lat 18°21'24", long 67°05'23", 7.18 Hydrologic Unit 21010003, at (18.6) barrio Cerro Gordo, 0.6 mi (1.0 km) upstream from Rio Culebrinas, 3.6 mi (5.8 km) northwest from Cerro Pichon, 2.8 mi (4.5 km) northeast from Cerro Pelao, and 5.1 mi (8.2 km) northwest of Cental La Plata. Lat 18°22'50", long 67°06'49 11 , 4.72 Hydroloigc unit 21010003, at (12.2) barrio Cruz, 0.2 mi (0.3 km) upstream from Rio Culebrinas, 2.6 mi (4.2 km) southwest from Monte El Ojo, and 1.0 mi (1.6 km) south of Moca plaza. Lat 18°22'19", long 67°09'06", 5.14 Hydrologic Unit 21010003, at (13.3) barrio Naranjo on Highway 417, 2.4 mi (3.9 km) northwest from Cerro Gordo, 4.5 mi (7.2 km) northeast of Cerro Canta Gallo, and 6 . 1 mi (9.8 km) north of Anasco plaza. DATE 2/24/94 4/20/94 2/24/94 4/20/94 TIME 0700 1410 0820 1140 2/24/94 4/20/94 2/24/94 4/20/94 2/24/94 4/20/94 2/24/94 4/20/94 2/24/94 4/20/94 1025 1050 0920 1300 1225 0840 1330 0755 1450 0645 STREAM- PLOW ft3 /s (m'/s) 9.97 (0.282) 6.47 (0.183) 16.0 (0.453) 9.89 (0.280) 6.84 (0.194) 0.77 (0.022) 8.45 (0.239) 5.68 9.43 (0.267) 6.87 1.27 (0.036) 0.10 (0.003) 3.77 (0.107) 2.54 (0.072) 415 Water-Quality at Partial-Record Stations in Puerto Rico 4 re ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATION Water-quality partial-record stations are partieeular 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 1993 TO SEPTEMBER 1994 PH SPE- WATER TRANS- CIFIC WHOLE PAR- DATE 50010720 NOV 23. MAR 15. JON 09. 1993 1994 TIME LAGO 0835 0850 0840 SAM- PLING DEPTH (FEET) GUAJATACA 1.00 1.00 1.00 CON- FIELD TEMPER- OXYGEN, DIS- SOLVED ENCY OXYGEN, (PER- DUCT- (STAND- ATURE (SBCCHI ANCE ARD WATER DISK) (US/CM) UNITS) (DBG C) RIO GUAJATACA BASIN NO. 3 NR MOUTH NR QUBBRADILLAS, 329 7.6 26.0 345 7.8 26.5 340 7.9 29.0 (IN) PR (LAT 28.0 55.2 50.4 DIS- CENT SOLVED SATUR- (MG/L) ATI ON) 18«22'05"N LONG 9.1 113 9.8 11.9 153 COLI- FORM, FECAL, 0.45 UM-MF (COLS./ 100 ML) 066°54'36 33 K21 -- "W) RIO GRANDE DE ARECIBO BASIN 50025110 NOV 19. MAR 17. JUN 03. 50039900 NOV 16. MAR 16. JUN 02. 50044400 NOV 15. MAR 10. MAY 27. 50057500 NOV 17. MAR 11. MAY 31. 1993 1994 •• 1993 1994 1993 1994 1993 1994 LAGO 0855 0910 0910 LAGO 0855 1225 0805 LAGO 0950 0755 0935 LAGO 0910 0810 1440 DOS BOCAS 1.00 1.00 1.00 CARITE NO. 1.00 1.00 1.00 NO. 3 AT WEST BRANCH NR UTUADO, 281 6.8 26.5 331 7.6 26.0 348 7.3 28.5 RIO DE LA PLATA BASIN 3 ON RIO DE LA PLATA NR CAYEY, 180 6.3 25.0 193 8.7 26.0 206 8.3 27.0 LA PLATA NO. 5 NR MOUTH NR NARANJITO, PR 1.00 1.00 -- LOIZA NO. 4 1.00 1.00 1.00 404 7.7 27.5 448 7.5 25.5 -- RIO GRANDE DE LOIZA BASIN PR (LAT 18.0 27.0 24.0 PR (LAT 42.0 48.0 32.0 18° 19' 15 "N LONG 7.0 86 7.4 6.8 88 18°05'04"N LONG 80 10.6 9.6 119 066°40'11 K42 190 570 066°06'03 K47 K4 Kll "W) "W) (LAT 18«19'33"N LONG 066° 12' 28 "W) 30.0 18.0 -- NR MOUTH NR CAGUAS, PR (LAT 18° 16 '51" 244 7.0 25.0 387 6.7 26.5 574 6.9 31.0 1.00 28.8 6.00 8.6 108 6.3 — N LONG 066°00'35 5.5 65 1.3 5.7 75 K20 K8 — "W) R6000 5100 85000 K = non-ideal count ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATION 4 17 WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 DATE ALKA- STREP- LINITY TOCOCCI WAT WH AT 105 FECAL, TOT PET DBG. C, (COLS. FIELD SUS- PBR MG/L AS FENDED 100 ML) CAC03 (MG/L) RESIDUE NITRO- TOTAL GEN,AM- MONIA + PHOS- ORGANIC PHORUS TOTAL TOTAL (MG/L (MG/L AS N) AS P) CHLOR-A CHLOR-B PHYTO- PHYTO- PLANK- PLANK- PLANK- PLANK- TON TON TON TON CHROMO CHROMO BIOMASS BIOMASS FLUOROM FLUOROM ASH WT DRY WT (UG/L) (UG/L) (MG/L) (MG/L) 50010720 RIO GUAJATACA BASIN--Continued LAGO GUAJATACA NO.3 NR MOUTH NR QUEBRADILLAS,PR (LAT 18°22'05"N LONG 066°54'36"W) NOV 1993 23... MAR 1994 15.. . JUN 09.. . 50025110 NOV 1993 19.. . MAR 1994 17... JUN 03.. . 50039900 NOV 1993 16... MAR 1994 16.. . JUN 02.. . 50044400 NOV 1993 15.. . MAR 1994 10.. . MAY 27.. . 50057500 NOV 1993 17.. . MAR 1994 11.. . MAY 31.. . 46 K19 — LAGO K19 42 210 LAGO K13 <4 " LAGO K6 K23 -- LAGO K6000 230 62000 130 130 140 DOS BOCAS 82 90 90 CARITB NO 36 37 44 6 0.40 0.010 3.30 0.100 0.50 0.020 4 -- -- 6.80 0.600 RIO QRANDB DB ARBCIBO BASIN- -Continued NO. 3 AT WEST BRANCH NR DTUADO, PR (LAT 18°19'15 2 0.30 0.030 12.0 0.400 0.50 0.070 11 0.80 0.040 6.00 0.400 RIO DB LA PLATA BASIN- -Continued .3 ON RIO DB LA PLATA NR CAYEY, PR (LAT 18°05'04 3 0.20 <0.010 4.90 1.10 16 0.50 <0.010 49.0 16.0 9 0.60 <0.010 7.90 2.70 LA PLATA NO. 5 NR MOUTH NR NARANJITO, PR (LAT 18° 19' 33 "N 140 150 -- LOIZA NO. 50 100 150 2 0.70 0.070 46.0 5.20 0.70 0.140 23 1.0 0.130 5.60 0.900 RIO GRANDB DB LOIZA BASIN- -Continued 440 -- 220 "N LONG 260 _- 350 "N LONG 250 250 240 450 -- 230 066°40'11"W) 260 -- 360 066°06'03"W) 260 260 250 LONG 066°12'28"W) 260 -- 490 4 NR MOUTH NR CAGUAS, PR (LAT 18°16'51"N LONG 066°00'35 208 1.1 0.290 0.900 0.200 10 2.4 0.480 2.30 0.300 44 5.9 0.720 15.0 2.50 850 260 860 260 -- 500 "W) 890 260 890 K = non-ideal count 4 18 MISCELLANEOUS STATION ANALYSES PH OXYGEN, COLI- DATE 50010790 NOV 1993 23.. . 23.. . MAR 1994 15.. . 15.. . JUN 09.. . 09.. . TIME 0910 0855 0910 0920 0915 0910 SPE- HATER TRANS- DIS- FORM, STREP- CIPIC WHOLE PAR- SOLVED FECAL, TOCOCCI SAM- CON- FIELD TEMPER- ENCY OXYGEN, (PER- 0.45 FECAL, PLING DUCT- (STAND- ATURE (SECCHI DIS- CENT UM-MF (COLS. DEPTH ANCE ARD HATER DISK) SOLVED SATUR- (COLS./ PER (FEET) (US/CM) UNITS) (DBG C) (IN) (MG/L) ATI ON) 100 ML) 100 ML) RIO GUAJATACA BASIN- -Continued LAGO GUAJATACA NO.l NR DAM NR QUEBRADILLAS,PR (LAT 18°23'56"N LONG 066°55'23 "H) 1.00 73.0 1.00 63.0 1.00 60.0 315 361 347 375 345 390 7.8 27.0 22.0 11.4 144 96 6.6 25.0 -- 0.1 1 — 7.8 26.0 70.8 9.0 -- <2 6.9 25.0 -- 0.1 7.9 29.0 49.2 10.4 134 25 6.8 25.0 -- 0.1 1 -- K6 - <2 - <10 - RIO GRANDE DE ARBCIBO BASIN- -Continued 50020050 NOV 1993 22. .. 22. .. MAR 1994 14.. . 14. .. JUN 08.. . 09.. . 50027090 NOV 1993 19.. . 19.. . MAR 1994 17.. . 17... JUN 03. .. 03. .. 50039950 NOV 1993 16.. . 16.. . MAR 1994 16.. . 16.. . JUN 02.. . 02.. . 50044950 NOV 1993 15.. . 15... MAR 1994 10.. . 10. .. MAY 26.. . 26. . . 1050 1045 1035 1030 1105 0910 LAGO GARZAS 1.00 10.0 1.00 54.0 1.00 __ NO.l NR 218 223 246 257 270 - LAGO DOS BOCAS NO.l 0935 0925 0955 0945 0930 0925 0930 0915 1305 1315 0835 0825 1045 1030 0900 0855 0830 0845 1.00 70.0 1.00 65.0 1.00 67.0 LAGO CARITE 1.00 60.0 1.00 57.0 1.00 54.0 LAGO LA PLATA 1.00 27.0 1.00 60.0 __ -- 277 244 315 315 342 335 RIO NO.l NR 182 210 194 202 205 234 NO. 3 NR 366 293 415 371 - - DAM NR AD JUNTAS, PR (LAT 18°08'21"N LONG 066°44'35"W) 6.9 23.0 66.0 5.7 70 K9 6.8 21.0 -- 0.4 5 7.6 23.5 30.0 8.3 -- K2 6.7 21.0 -- 0.1 7.6 26.5 25.0 9.4 93 K4 -- NR DAM NR UTUADO, PR (LAT 18°20'09''N LONG 066°40'04"H) 7.7 26.5 44.0 7.3 91 36 6.8 25.0 -- 3.0 37 8.0 26.0 6.80 8.2 -- K4 6.7 25.0 -- 0.1 7.5 29.0 56.4 7.0 90 28 M6.7 26.0 -- 0.1 1 DE LA PLATA BASIN— Continued DAM NR CAYEY, P.R. (LAT 18°04'39"N LONG 066°06'19"H) 6.5 25.5 48.0 7.0 89 K8 6.3 22.5 -- 0.1 1 — 8.8 25.5 60.0 11.1 -- K4 6.4 22.5 -- 0.1 8.4 27.0 33.0 <10.0 125 6.4 22.5 -- 0.1 1 -- DAM NR NARANJITO, PR (LAT 18°20'18"N LONG 066°14 ' 01"W) 7.0 27.5 49.0 4.8 60 26 6.5 25.5 -- 0.1 1 — 7.3 27.0 60.0 6.5 -- <2 6.6 24.5 -- 0.1 __ -- K9 - K2 - K8 - K7 - <2 - 30 - - - <2 - - " K12 - 31 - - - RIO GRANDE DE LOIZA BASIN- -Continued 50058800 NOV 1993 17. .. 17.. . MAR 1994 11. . . 11.. . MAY 31.. . 31. . . 1015 1000 0905 0900 1145 1200 LAGO LOIZA NO. 1.00 24.0 1.00 21.0 __ __ 7 NR DAM NR TRUJILLO ALTO, PR (LAT 18°19'29"N LONG 066°00'47"W) 361 270 345 355 - - 6.6 28.0 22.0 3.6 45 290 6.6 25.5 -- 2.0 24 6.9 27.0 31.2 7.9 -- 48 6.6 26.0 -- 0.2 __ __ 180 - 97 - - - MISCELLANEOUS STATION ANALYSES 479 HARD- MAGNE- NBSS CALCIUM SIUM, TOTAL DIS- DIS- (MG/L SOLVED SOLVED DATE AS (MG/L (MG/L CAC03) AS CA) AS MG) 50010790 LAGO GOAJATACA NO. NOV 1993 23... 23.. . MAR 1994 15. .. 15.. . JUN 09... 09... 150 130 130 150 140 110 55 3.2 45 3.3 47 3.6 52 3.7 51 3.3 39 3.4 ALKA- SODIUM POT AS- LINITY CHLO- FL0O- SODIUM, AD- SIUM, WAT WH SULFATE RIDE, RIDE, DIS- SORP- DIS- TOT PET DIS- DIS- DIS- SOLVED TION SOLVED FIELD SOLVED SOLVED SOLVED (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L AS NA) AS K) CAC03 AS SO4 ) AS CL) AS F) RIO GUAJATACA BASIN- -Continued 1 NR DAM NR QUEBRADILLAS, PR (LAT 18°23'56 HN LONG 066<>55' 23 "W) 4.9 0.2 1.6 160 5.2 0.2 1.6 120 5.6 0.2 1.9 130 5.8 0.2 2.1 140 4.8 0.2 2.0 130 5.5 0.2 1.8 110 7.1 6.7 8.7 7.6 8.8 8.4 8.6 8.4 9.8 7.0 9.3 8.4 0.10 0.10 <0.10 <0.10 0.10 <0.10 RIO GRANDE DE ARECIBO BASIN- -Continued 50020050 NOV 1993 22.. . 22.. . MAR 1994 14.. . 14.. . JUN 08. .. 09. .. 50027090 NOV 1993 19.. . 19.. . MAR 1994 17.. . 17.. . JUN 03.. . 03.. . 50039950 NOV 1993 16. .. 16... MAR 1994 16... 16. .. JUN 02.. . 02. .. 50044950 NOV 1993 15. .. 15.. . MAR 1994 10.. . 10. .. MAY 27.. . 27. .. 50058800 NOV 1993 17.. . 17. .. MAR 1994 11. .. 11. . . MAY 31. . . 31. . . 61 -- 68 65 71 68 69 82 93 93 93 99 32 30 33 33 35 34 86 120 120 140 140 140 LAGO GARZAS NO. 17 4.6 __ 19 5.1 18 4.9 19 5.7 19 5.0 LAGO DOS BOCAS 19 5.3 22 6.6 25 7.5 25 7.4 25 7.4 27 7.6 LAGO CARITE NO. 7.0 3.6 5.3 4.0 6.9 3.9 6.7 3.9 7.0 4.3 6.2 4.4 LAGO LA PLATA NO. 20 8.8 28 12 28 11 33 13 32 14 33 15 1 NR DAM NR ADJUNTAS.PR (LAT 18°08'21"N LONG 066°44'35 6.4 0.4 1.1 69 82 6.0 0.3 1.5 84 6.1 0.3 1.3 74 6.8 0.4 1.3 77 6.2 0.3 1.6 NO.l NR DAM NR UTUADO, PR (LAT 18°20'09"N 8.7 0.5 1.8 65 11 0.5 2.0 80 12 0.5 2.2 90 12 0.5 2.2 90 12 0.5 2.3 92 14 0.6 2.3 90 RIO DE LA PLATA BASIN- -Continued 1 NR DAM NR CAYEY, P.R. (LAT 18O04'39»N 6.1 0.5 1.1 52 8.8 0.7 0.90 35 8.6 0.6 0.90 38 7.9 0.6 1.0 41 8.4 0.6 1.0 57 10 0.8 0.90 40 3 NR DAM NR NARANJITO, PR (LAT 18°20'18" 16 0.8 3.0 94 18 0.7 2.5 120 16 0.6 2.4 120 21 0.8 2.1 140 20 0.7 2.7 22 0.8 1.9 RIO GRANDE DE LOIZA BASIN- -Continued LAGO LOIZA NO. 7 NR DAM NR TROJILLO ALTO, PR (LAT 18°19'29 65 98 79 81 100 110 16 6.0 24 9.2 19 7.7 20 7.6 26 9.7 26 9.9 16 0.9 3.2 71 24 1 3.1 100 23 1 0.20 89 25 1 2.4 85 29 1 4.0 30 1 4.0 3.2 4.9 0.40 4.5 0.60 5.4 2.4 5.5 2.8 5.8 0.20 5.3 "W) 0.10 <0.10 <0.10 <0.10 <0.10 <0.10 LONG 066<>40' 04 »W) 9.6 8.4 15 10 16 13 17 16 13 12 17 13 LONG 066°06'19 0.20 6.7 3.2 8.0 2.6 8.9 2.6 9.3 0.90 9.2 3.0 10 N LONG 066°14' 14 62 12 16 8.0 18 13 22 9.3 22 15 24 "N LONG 066° 00 11 17 15 22 16 25 15 24 18 30 17 29 0.10 0.20 <0.10 <0.10 <0.10 <0.10 "W) 0.10 0.10 <0.10 <0.10 <0.10 <0.10 01"W) 0.20 0.20 0.10 0.10 0.10 0.10 '47"W) 0.20 0.10 0.10 0.10 0.10 0.10 420 DATE 50010790 MISCELLANEOUS STATION ANALYSES SOLIDS, RESIDUE NITRO- CHLOR-A CHLOR-B SILICA, SUM OP TOTAL GEN, AM- PHYTO- PHYTO- DIS- CONSTI- AT 105 MOOTA + PHOS- PLANK- PLANK- PLANK- PLANK- SOLVED TUENTS, DEG. C, ORGANIC PHORUS TON TON TON TON (MG/L DIS- SOS- TOTAL TOTAL CHROMO CHROMO BIOMASS BIOMASS AS SOLVED FENDED (MG/L (MG/L PLUOROM PLUOROM ASH WT DRY WT SI02) (MG/L) (MG/L) AS N) AS P) (UG/L) (UG/L) (MG/L) (MG/L) RIO GUAJATACA BASIN--Continued LAGO GUAJATACA NO.1 NR DAM NR QUBBRADILLAS,PR (LAT 18°23'56"N LONG 066°55'23"W) NOV 1993 23.. . 23.. . MAR 1994 15.. . 15.. . JUN 09. .. 09. .. 50020050 NOV 1993 22. .. 22. . . MAR 1994 14.. . 14.. . JUN 08.. . 09.. . 50027090 NOV 1993 19.. . 19.. . MAR 1994 17.. . 17.. . JUN 03... 03. .. 50039950 NOV 1993 16.. . 16.. . MAR 1994 16.. . 16.. . JUN 02.. . 02.. . 50044950 NOV 1993 15.. . 15.. . MAR 1994 10.. . 10.. . MAY 27. . . 27.. . 50058800 NOV 1993 17.. . 17.. . MAR 1994 11.. . 11. . . MAY 31. . . 31.. . 7.5 1.4 4.0 5.2 5.3 4.8 LAGO 19 17 20 20 18 20 LAGO 22 23 24 24 22 22 LAGO 21 13 19 18 19 19 LAGO LA 22 19 23 23 20 22 182 145 157 170 161 138 GARZAi 98 -- 108 102 106 108 DOS B( 137 115 158 154 157 149 CARITI 72 69 74 74 77 84 PLAT; 183 199 211 178 222 211 LAGO LOIZA NC 28 19 25 26 26 27 185 131 170 170 207 208 1 0.30 <0.010 6.40 0.200 260 2 0.30 <0.010 3.50 0.100 250 <1 7.20 0.300 300 270 260 310 RIO GRANDE DB ARECIBO BASIN--Continued LAGO GARZAS NO.1 NR DAM NR ADJUNTAS,PR (LAT 18°08'21"N LONG 066°44'35"W) 2 0.30 0.010 3.30 0.200 260 260 5 0.40 0.010 6.40 0.200 250 260 4 -- — 2.80 0.200 360 370 LAGO DOS BOCAS NO.l NR DAM NR UTUADO,PR (LAT 18°20'09"N LONG 066°40'04"W) 1 0.20 0.020 6.70 0.300 250 260 1 0.30 <0.010 2.80 0.200 250 260 <1 0.40 0.010 5.20 0.400 240 240 RIO DE LA PLATA BASIN--Continued LAGO CARITB NO.l NR DAM NR CAYEY, P.R. (LAT 18°04'39"N LONG 066°06'19"W) 3 <0.20 <0.010 6.40 1.30 250 260 0.50 <0.010 62.0 19.0 250 260 17 0.40 0.020 13.0 5.10 210 220 LAGO LA PLATA NO.3 NR DAM NR NARANJITO, PR (LAT 18°20'18"N LONG 066°14'01"W) 2 0.30 0.020 2.10 0.100 250 250 5 0.30 0.040 2.20 0.200 250 260 8 0.30 0.010 2.00 0.300 240 250 RIO GRANDS DE LOIZA BASIN--Continued LAGO LOIZA NO.7 NR DAM NR TRUJILLO ALTO, PR (LAT 18°19'29"N LONG 066°00'47 M W) 12 0.80 0.140 12.0 0.80 0.110 0.90 0.080 12.0 0.800 260 1.90 280 270 290 PESTICIDE ANALYSES OF SAMPLES COLLECTED AT HATER-QUALITY PARTIAL RECORD STATIONS 421 HATER-QUALITY DATA, HATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 CHLOR- DI- DI- BNDO- PCB, ALDRIN, DANE, ODD, DDE, DOT, AZINON, BLDRIN SOLFAN, 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 GDAJATACA BASIN--CONTINUED 50010790 LAGO GDAJATACA NO.l NR DAM NR QUBBRADILLAS, PR (LAT 18°23'56"N LONG 066°55'23"W) JUN 09... 0915 <0.1 <0.010 <0.1 <0.010 <0.010 <0.010 <0.01 <0.010 <0.010 RIO GRANDB DB ARBCIBO BASIN--CONTINUED 50020050 LAGO GARZAS NO.l NR DAM NR ADJUNTAS,PR (LAT 180 08'21 H N LONG 066°44'35"W) JtJN 08... 1105 <0.1 <0.010 <0.1 <0.010 <0.010 <0.010 <0.01 <0.010 <0.010 50027090 LAGO DOS BOCAS NO.l NR DAM NR UTUADO,PR (LAT 18020'09 HN LONG 0660 40'04 H H) JtJN 03... 0930 <0.1 <0.010 <0.1 <0.010 <0.010 <0.010 <0.01 <0.010 <0.010 RIO DB LA PLATA BASIN--CONTINUED 50039950 LAGO CARITB NO.l NR DAM NR CAYBY, P.R. (LAT 180 04'39 HN LONG 066°06'19"W) JDN 02... 0835 <0.1 <0.010 <0.1 <0.010 <0.010 <0.010 <0.01 <0.010 <0.010 50044950 LAGO LA PLATA NO.3 NR DAM NR NARANJITO, PR (LAT 18<>20'18"N LONG 066°14'01"W) MAY 27... 0845 <0.1 <0.010 <0.1 <0.010 <0.010 <0.010 <0.01 <0.010 <0.010 RIO GRANDB DB LOIZA BASIN--CONTINUED 50058800 LAGO LOIZA NO.7 NR DAM NR TRUJILLO ALTO, PR (LAT 18°19'29"N LONG 066°00'47"W) MAY 1994 31... 1145 <0.1 <0.010 <0.1 <0.010 <0.010 <0.010 0.02 <0.010 <0.010 422 PESTICIDE ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL RECORD STATIONS WATER-QUALITY DATA, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 ENDRIN HEPTA- MBTH- METHYL WATER HEPTA- CHLOR MALA- OXY- PARA- ONFLTRD ETHION, CHLOR, EPOXIDE LINDANB THION, CHLOR, THION, MIREX, REC 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) DATE 50010790 JUN 09. .. JUN 03. .. MAY 27.. . 50058800 MAY 1994 RIO GUAJATACA BASIN--CONTINUED LAGO GUAJATACA NO.l NR DAM NR QUBBRADILLAS,PR (LAT 18°23'56"N LONG 066°55'23"W) <0.010 <0.01 <0.01 <0.01 <0.010 <0.010 <0.010 <0.01 <0.01 RIO GRANDE DE ARECIBO BASIN--CONTINUED 50020050 LAGO GARZAS NO.l NR DAM NR ADJUNTAS,PR (LAT 18°08'21 UN LONG 066°44'35"W) JUN 08... <0.010 <0.01 <0.010 <0.010 <0.010 <0.01 <0.01 <0.01 <0.01 50027090 LAGO DOS BOCAS NO.l NR DAM NR UTUADO,PR (LAT 18<>20'09"N LONG 066°40'04"W) <0.010 <0.01 <0.010 <0.010 <0.010 <0.01 <0.01 <0.01 <0.01 RIO DE LA PLATA BASIN--CONTINUED LAGO CARITE NO.l NR DAM NR CAYEY, P.R. (LAT 18°04'39"N LONG 066°06'19"W) 50039950 JUN 02... <0.010 <0.01 <0.010 <0.010 <0.010 <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) <0.010 <0.01 <0.010 <0.010 <0.010 <0.01 <0.01 <0.01 <0.01 RIO GRANDE DE LOIZA BASIN--CONTINUED LAGO LOIZA NO.7 NR DAM NR TRUJILLO ALTO, PR (LAT 18°19'29"N LONG 066°00'47"W) <0.010 <0.01 <0.010 <0.010 <0.010 <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 1993 TO SEPTEMBER 1994 NAPH- THA- LENES, PARA- POLY- PER- TOX- TOTAL THION, CHLOR. THANE APHENE, TRI- 2,4-D, 2,4,5-T 2, 4-DP SILVBX, 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) 423 DATE 50010790 JUN 09.. . 50020050 JUN 08... 50027090 JUN 03.. . 50039950 JUN 02.. . 50044950 MAY 27.. . 50058800 MAY 1994 31.. . RIO GUAJATACA BASIN--CONTINUED LAGO GUAJATACA NO.l NR DAM NR QUEBRADILLAS,PR (LAT 18°23'56 HN LONG 066°55'23"W) <0.01 <0.10 <0.1 <1 <0.01 0.07 <0.01 <0.01 <0.01 RIO GRANDE DE ARECIBO BASIN--CONTINUED LAGO GARZAS NO.l NR DAM NR ADJUNTAS,PR (LAT 18°08'21"N LONG 066°44'35"W) <0.01 <0.10 <0.1 <1 <0.01 <0.01 <0.01 <0.01 <0.01 LAGO DOS BOCAS NO.l NR DAM NR UTUADO,PR (LAT 18°20'09"N LONG 066°40'04"W) <0.01 <0.10 <0.1 <1 <0.01 0.03 <0.01 <0.01 <0.01 RIO DE LA PLATA BASIN--CONTINUED LAGO CARITE NO.l NR DAM NR CAYEY, P.R. (LAT 18°04'39''N LONG 066°06' 19"W) <0.01 <0.01 <0.01 <0.01 <0.10 <0.1 <1 <0.01 <0.01 LAGO LA PLATA NO.3 NR DAM NR NARANJITO, PR (LAT 18°20'18"N LONG 066°14'01"W) <0.01 <0.10 <0.1 <1 <0.01 <0.01 <0.01 <0.01 <0.01 RIO GRANDE DE LOIZA BASIN--CONTINUED LAGO LOIZA NO.7 NR DAM NR TRUJILLO ALTO, PR (LAT 18°19'29"N LONG 066°00'47"W) <0.01 <0.10 <1 <0.01 0.02 <0.01 <0.01 <0.01 424 THIS PAGE WAS LEFT BLANK INTENTIONALLY 425 Ground-Water Records for Puerto Rico 426 GROUND-WATER LEVELS RIO GUAJATACA BASIN 182422067015100. Local number, 165. LOCATION.--Lat 18*24'22", long 67*01'51", Hydrologia Unit 21010003, 5.60 mi northeast of Hooa plaza, 4.70 mi southeast of Aguadilla U.S. Naval Reservation radio antenna, and 1.63 mi northwest of La Virgen del Rosario Church. Owner: P.R. Aqueduct and Sewer Authority, Name: Saltos # 1 (Mateo Perez). AQUIFER.--Cibao Formation. Aguada Limestone. WELL CHARACTERISTICS.--Drilled production water-table well, diameter 16 in (0.40 m), cased 16 in (0.40 m) 0-40 ft (0-12.2 m), cased 12 in (0.30 m) 40-200 ft (12.2-61.0 m). Depth 200 ft (61.0 m) . INSTRUMENTATION.--Digital water level recorder--60-minute punch. 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. top of pump base, 1.00 ft (0.30 m) above land-surface datum. REMARKS.--Recording observation well. Formerly published as 182421067015000. PERIOD OP RECORD.--January 1982 to March 1985, November 1985 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 38.36 ft (11.7 m) below land-surface datum, July 12, 1993; 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 1993 TO SEPTEMBER 1994 INSTANTANEOUS OBSERVATION AT 1200 Prior to November 1985, hole on DAY OCT NOV DEC JAN FEB MAR APR MAY JUL AUG MEAN 41.25 41.76 WTR YR 1994 MEAN 42.14 42.59 42.62 43.31 43.46 42.57 42.09 42.03 41.45 HIGHEST 40.73 OCT. 3, 1993 LOWEST 43.92 MAR. 4, 5, 6, 1994 41.33 SEP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 40.97 41.02 40.84 40.95 41.07 41.12 41.64 41.33 41.19 41.08 40.97 40.95 40.94 41.01 41.31 41.10 41.25 41.14 41.10 41.33 41.42 41.68 41.62 41.48 41.32 41.45 41.37 41.54 41.44 41.57 41.41 41.28 41.24 41.62 41.56 41.67 41.50 41.78 42.42 42.10 42.18 42.15 42.13 41.99 41.80 41.78 41.86 41.73 41.75 41.73 41.57 41.52 41.47 41.72 41.63 41.75 41.63 41.92 41.78 41.70 41.84 ___ 41.93 42.13 41.99 42.11 41.94 41.85 42.52 42.30 42.99 42.69 42.54 42.67 42.71 42.73 42.79 42.84 42.92 42.80 42.69 42.54 42.72 42.80 42.93 43.01 42.84 42.76 42.71 42.80 42.81 42.70 42.63 42.50 42.37 42.22 42.17 42.11 42.00 41.91 41.84 42.09 42.28 42.43 42.27 42.36 42.54 42.41 42.35 42.65 43.11 43.26 43.34 43.03 43.10 42.95 42.85 42.97 43.04 43.10 42.99 42.87 43.03 43.10 43.16 43.28 43.38 43.15 43.18 43.02 43.12 43.02 43.12 43.25 43.30 43.32 43.35 43.07 43.23 43.30 43.30 43.35 43.40 43.48 43.28 43.34 43.46 43.52 43.57 43.58 43.62 43.49 ___ ___ --- 43.59 43.65 43.65 43.73 43.85 43.89 43.68 43.74 43.77 43.66 43.58 43.63 43.47 43.35 43.47 43.29 43.20 43.10 43.47 43.54 43.41 43.50 43.36 43.51 43.39 43.27 43.17 43.14 43.07 43.00 42.98 43.02 43.02 42.95 42.77 42.63 42.81 42.77 42.71 42.64 42.72 42.74 42.93 42.84 42.93 42.85 42.73 42.65 42.59 42.50 42.42 42.38 42.31 42.23 42.19 42.12 42.06 42.25 42.19 42.17 42.12 --- 42.06 42.32 42.19 42.05 42.02 42.22 42.14 42.05 41.95 41.96 41.95 42.06 41.93 42.13 42.02 41.92 41.86 41.73 41.90 41.83 42.03 42.25 42.43 42.49 42.33 42.26 42.19 42.29 42.18 42.09 42.04 42.03 42.22 42.11 42.26 42.15 42.06 42.24 42.13 42.03 41.91 41.80 42.01 41.92 41.91 42.00 42.14 42.18 42.28 42.19 42.08 42.25 42.14 42.04 41.93 41.86 41.77 41.72 41.92 41.78 41.71 —— 41.67 41.61 41.57 41.56 41.74 41.58 41.52 41.54 41.52 41.45 41.40 41.58 41.46 41.43 41.32 41.50 41.40 41.37 41.28 41.27 41.34 41.42 41.30 41.26 41.28 41.25 41.46 41.35 41.56 41.51 41.37 41.56 41.45 41.42 41.30 41.25 41.35 41.28 41.19 41.11 41.32 41.27 41.21 41.40 41.28 41.20 41.14 41.34 41.24 41.12 41.06 41.26 41.15 41.09 41.29 41.23 41.42 41.71 41.63 41.53 41.72 41.59 41.70 41.58 41.46 41.39 41.28 41.25 41.42 41.56 41.44 41.29 41.24 41.19 41.62 41.48 41.57 41.50 41.43 41.27 41.13 41.24 41.23 41.08 41.17 41.20 41.07 41.03 41.56 41.37 41.22 41.06 --- 41.33 _ UJQ * 35 40 45 1990 1991 1992 WATER YEAR 1993 1994 WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM ftto IO . 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Ul Hi H "n COto o u to 1 IO H Ot Ot H Hi • rr to E? . 10o S?lo 9 5" ** H • n Z i rr HI i >"< i q - a p C 0 9 . 0.5*1= 9 g 0 H 9 M CO £"*%* 8C| w 0 O 0 * O « 9 « ^9 o I * * H sl^i • °Dg| fl 0 <Q |^ 1 *Q "• M Q O\ 0 » °lto rr ui o 0 9 uito 0 Oi to 9 ft O • * p. 10 Irtf M3M ' 8£ ? ° 9 3 0 Hi 10 n o H H O 9 0 1" a? o to h o « ^S 9? |s KI rr «** • O ' g. > KI A 9 IE C H a 9 rr « 9 T) a H Oi9 rn At 0, to S O S 5 H £ CO Hsi 428 GROUND-WATER LEVELS RIO GRANDE DE ARBCIBO BASIN 182737066370900. Local number, 204. LOCATION. —Lat 18*27'37", long 66*37'09", Hydrologic Unit 21010002, 5.26 mi west of Barceloneta plaza, 1.56 mi north of Hwy 2 km 63.7, and 3.67 mi southwest of Eacuela Aguatin Balaeiro. Owner: Suceai6n MarQuez, Name: Gilberto Rivera well. AQUIFER.--Aymam6n Limestone. NELL CHARACTERISTICS.—Abandoned unuaed water-table well, diameter 6 in (0.15 m), caaed 6 in (0.15 m) . INSTRUMENTATION.--Digital water level recorder--60-minute punch. DATUM.--Elevation of land-surface datum ia 46.0 ft (14.63 m) above mean aea level. Meaauring point: Air hole on pump base, 0.50 ft (0.15 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--October 1965 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 50.00 ft (15.24 m) below land-surface datum. May 14, 1966} loweat water level recorded, 52.59 ft (16.0 m) below land-surface datum, Apr. 15, 1994. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV JAN FEB MAR APR JUL AUG SEP 1 51.65 2 51.67 3 51.69 4 51.90 5 51.91 6 51.95 7 51.99 6 51.99 9 52.00 10 51.97 11 51.95 12 51.92 13 51.67 14 51.66 15 51.65 16 51.67 17 51.91 16 51.94 19 52.01 20 52.03 21 52.07 22 52.06 23 52.06 24 52.06 25 52.03 26 51.99 27 51.99 28 52.01 29 52.03 30 52.04 31 52.06 MEAN 51.97 WTR YR 1994 U Q u •» i t i ^ SJ 52.06 52.06 52.06 52.10 52.09 52.06 52.06 52.06 52.06 52.03 51.97 51.96 51.97 52.03 52.05 52.05 52.04 52.05 52.03 52.01 51.96 51.98 52.00 52.02 52.00 51.96 51.96 52.02 52.05 52.09 52.03 MEAN 52.17 51 —— r 52 ^W 53 —— L 52.10 52.11 52.09 52.10 52.06 52.09 52.10 52.12 52.10 52.09 52.09 52.06 52.09 52.10 52.13 52.12 52.13 52.14 52.17 52.16 52.15 52.16 52.17 52.19 52.23 52.23 52.24 52.27 52.26 52.22 52.17 52.14 HIGHEST '*V 1990 52.17 52.17 52.15 52.10 52.06 52.10 52.13 52.15 52.15 52.16 52.17 52.16 52.16 52.12 52.12 52.15 52.21 52.25 52.23 52.20 52.22 52.23 52.21 52.20 52.19 52.19 52.19 52.19 52.24 52.25 52.26 52.16 51.59 52.26 52.22 52.21 52.22 52.23 52.24 52.24 52.22 52.22 52.24 52.25 52.26 52.26 52.25 52.24 52.25 52.24 52.24 52.20 52.16 52.16 52.16 52.15 52.15 52.15 52.13 52.11 52.12 52.21 SEPT. 9, 1 **l A W' 1 1991 52.16 52.24 52.29 52.26 52.26 52.24 52.23 52.23 52.22 52.20 52.25 52.25 52.25 52.24 52.23 52.24 52.26 52.26 52.26 52.26 52.25 52.27 52.26 52.26 52.24 52.24 52.25 52.27 52.34 52.40 52.42 52.26 52.41 52.36 52.36 52.41 52.37 52.34 52.33 52.36 52.36 52.39 52.43 52.46 52.46 52.49 52.49 52.46 52.50 52.50 52.50 52.49 52.46 52.46 52.45 52.41 52.36 52.34 52.37 52.39 52.42 52.40 52.42 1994 LOWEST 52.59 x\ W Vv I vA V 52.33 52.34 52.41 52.41 52.41 52.42 52.43 52.41 52.34 52.32 52.26 52.26 52.27 52.26 52.25 52.23 52.19 52.16 52.12 52.11 52.11 52.10 52.12 52.13 52.14 52.14 52.17 52.16 52.17 52.22 52.25 52.25 APR. 15, fiWy f I 1992 WATER YEAR 52.26 52.31 52.34 52.35 52.32 52.33 52.34 52.34 52.35 52.34 52.32 52.33 52.36 52.40 52.44 52.46 52.45 52.46 52.45 52.46 52.46 52.45 52.44 52.43 52.39 52.34 52.34 52.31 52.32 52.31 52.36 1994 wv 1993 52.36 52.36 52.34 52.35 52.34 52.32 52.29 52.30 52.29 52.26 52.26 52.26 52.34 52.36 52.35 52.36 52.40 52.39 52.36 52.36 52.31 52.28 52.21 52.19 52.17 52.17 52.16 52.14 52.14 52.14 52.13 52.26 I ^V YW 52.11 52.11 52.11 52.06 52.03 51.96 51.93 51.90 51.90 51.90 51.91 51.94 52.02 52.04 52.07 52.06 52.02 51.95 51.90 51.65 51.64 51.64 51.64 51.65 51.66 51.67 51.69 51.69 51.90 51.90 51.66 51.95 / v/; 1994 51.64 51.79 51.73 51.71 51.66 51.66 51.65 51.65 51.66 51.71 52.13 52.15 52.17 52.16 52.12 52.12 52.10 52.09 52.06 52.09 52.08 52.09 52.13 52.16 52.17 52.17 52.20 52.20 52.16 51.99 GROUND-WATER LEVELS 429 RIO QRANDE DE HANATI BASIN 182757066325600. Local number, 206. LOCATION.--Lat 18*27'57", long 66*32'56", Hydrologic Unit 21010002, 0.84 mi northwest of Barceloneta plaza, 0.64 mi west of Central Plazuela, and 1.96 mi southeast of Escuela Agustin Balseiro. Owner: P.R. Department of Agriculture, Name: Plazuela No. 2. AQUIFER.--Aymam6n Lime*tone. HELL CHARACTERISTICS.—Drilled unused water-table well, diameter 16 in (0.41 m), caved 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) . INSTRUMENTATION.—Digital water level recorder--60-minute punch. 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 caving, 1.30 ft (0.40 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--October 1985 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 3.75 ft (1.14 m) below land-surface datum, Sept. 11, 1988; lowest water level recorded, 5.89 ft (1.80 m) below land-surface datum, Apr. 11, 12, 1990. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 INSTANTANEOUS OBSERVATION AT 1200 DAY FEB MAR APR MAY JUN OUL AUG SEP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 5.08 5.09 5.11 5.12 5.14 5.17 5.20 5.20 5.20 5.18 5.14 5.09 5.06 5.06 5.07 5.10 5.13 5.17 5.23 5.27 5.29 5.30 5.30 5.25 5.22 5.19 5.20 5.21 5.25 5.26 5.28 5.29 5.29 5.31 5.34 5.33 5.31 5.30 5.29 5.28 5.24 5.20 5.20 5.21 5.26 5.28 5.27 5.26 5.25 5.24 5.22 5.20 5.21 5.23 5.27 5.27 5.25 ___ ___ —— —— ___ —— ___ —— ___ —— ___ 5.40 5.43 5.47 5.48 5.51 5.55 5.55 5.49 5.45 5.43 5.42 5.40 5.36 5.32 5.33 5.35 5.37 5.38 5.40 5.39 5.40 5.39 5.36 5.36 5.37 5.43 5.46 5.45 5.42 5.43 5.45 5.44 5.42 5.43 5.43 5.43 5.43 5.48 5.50 5.51 5.50 5.46 5.46 5.46 5.48 5.49 5.50 5.48 5.48 5.51 5.54 5.55 5.54 5.53 5.51 5.52 5.49 5.48 5.44 5.41 5.40 5.39 5.38 5.39 5.39 5.37 5.36 5.37 ___ —— 5.40 5.47 5.54 5.53 5.49 5.48 5.45 5.46 5.45 5.43 5.49 5.49 5.49 5.48 5.47 5.48 5.50 5.53 5.53 5.50 5.49 5.51 5.53 5.50 5.49 5.48 5.50 5.52 5.58 5.61 5.64 5.63 5.60 5.60 5.62 5.60 5.57 5.57 5.59 5.60 5.60 5.63 5.67 5.70 5.72 5.73 5.72 5.73 5.75 5.73 5.71 5.70 5.67 5.66 5.61 5.58 5.58 5.59 5.60 5.63 5.62 —— 5.60 5.60 5.62 5.62 5.61 5.60 5.60 5.58 5.55 5.51 5.47 5.46 5.45 5.45 5.46 5.45 5.44 5.40 5.36 5.33 5.32 5.31 5.35 5.36 5.37 5.38 5.40 5.41 5.40 5.44 5.47 5.50 5.54 5.55 5.55 5.54 5.54 5.55 5.56 5.57 5.56 5.56 5.56 5.57 5.59 5.62 5.65 5.64 5.64 5.63 5.63 5.63 5.63 5.63 5.63 5.59 5.58 5.57 5.58 5.57 5.57 —— 5.58 5.57 5.56 5.56 5.55 5.55 5.53 5.55 5.55 5.54 5.54 5.56 5.58 5.59 5.60 5.61 5.64 5.63 5.62 5.62 5.60 5.58 5.56 5.55 5.52 5.52 5.50 5.49 5.48 5.49 5.46 5.45 5.45 5.46 5.44 5.40 5.36 5.32 5.29 5.30 5.31 5.33 5.36 5.41 5.44 5.47 5.47 5.44 5.40 5.35 5.31 5.30 5.31 5.31 5.32 5.32 5.35 5.36 5.38 5.39 5.40 5.38 5.36 5.31 5.26 5.24 5.22 5.20 5.21 5.21 5.21 5.25 5.25 5.25 5.27 5.26 5.24 5.24 5.23 5.23 5.23 5.23 5.23 5.23 5.26 5.30 5.30 5.29 5.30 5.30 5.27 MEAN 5.18 5.26 5.48 5.41 5.46 5.50 5.64 5.46 5.58 WTR YR 1994 MEAN 5.43 HIGHEST 5.05 OCT. 13, 1993 LOWEST 5.80 APR. 15, 1994 5.56 5.37 5.25 1990 1991 1992 WATER YEAR 1993 1994 430 GROUND-WATER LEVELS RXO GRANDE DE MANATI BASIN 182710066303700. Local number, 207. LOCATION.--Lat 18*27'10", long 66*30'37", Hydrologic Unit 21010002, 1.92 mi east of Barceloneta plaza, 1.35 mi north of Central Honserrate, and 2.68 mi northeast of Escuela Jose Cordero. Owneri P.R. Aqueduct and Sewer Authority, Namei 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). INSTRUMENTATION.--Digital water level recorder--60-minute punch. DATUM.--Elevation of land-surface datum is about 59.0 ft (18.0 m) above mean sea level, from topographic map. Measuring pointi Top of shelter floor, 2.80 ft (0.85 m) above land-surface datum. Prior to Nov. 20, 1992, hole on side of casing, 2.00 ft (0.61 m) above land-surface datum. REMARKS.--Recording observation well. PERXOD OF RECORD.--October 1985 to current year. EXTREMES FOR PERXOD 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, XN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV JAN MAR APR MAY JUN JUL AUG SEP 1 38.93 2 38.92 3 38.93 4 38.94 5 38.95 6 38.96 7 38.98 8 38.98 9 38.98 10 38.97 11 38.96 12 38.92 13 38.89 14 38.88 15 38.89 16 38.90 17 38.93 18 38.94 19 38.97 20 38.99 21 39.00 22 39.00 23 39.01 24 39.00 25 39.00 26 38.98 27 38.98 28 38.99 29 39.01 30 39.03 31 39.03 MEAN 38.96 WTR YR 1994 E!g j| >S* jfi 39.04 39.06 39.10 39.11 39.10 39.09 39.09 39.10 39.10 39.09 39.08 39.08 39.09 39.10 39.09 39.05 39.01 38.98 38.94 38.91 38.89 38.88 38.89 38.91 38.92 38.92 38.94 38.97 38.98 39.00 39.02 MEAN 39.30 38 —— r 39 A \v V* 40 - 41 —— «- 39.01 39.03 39.03 39.03 39.02 39.02 39.04 39.05 39.05 39.05 39.06 39.09 39.11 39.11 39.10 39.09 39.09 39.09 39.08 39.05 39.05 39.06 39.10 39.13 39.17 39.21 39.25 39.27 39.27 39.26 39.25 39.10 HIGHEST A.^v~s 1990 39.25 39.23 39.21 39.18 39.15 39.16 39.16 39.17 39.19 39.21 39.22 39.15 39.12 39.10 39.10 39.10 39.12 39.14 39.14 39.15 39.15 39.17 39.18 39.18 39.19 39.20 39.22 39.23 39.25 39.26 39.26 39.18 38.88 V jv^ 39.26 39.25 39.25 39.26 39.27 39.28 39.29 39.30 39.31 39.33 39.35 39.36 39.36 39.36 39.36 39.36 39.34 39.33 39.31 39.30 39.29 39.27 39.27 39.27 39.29 39.29 39.29 39.30 39.30 NOV. 21, 1 ^J V^ 1 1991 39.32 39.33 39.35 39.37 39.36 39.34 39.32 39.33 39.34 39.35 39.36 39.38 39.38 39.37 39.35 39.35 39.35 39.35 39.36 39.35 39.34 39.35 39.36 39.36 39.37 39.36 39.37 39.38 39.40 39.42 39.44 39.36 22, 1993 i ^/\J\ i 39.45 39.46 39.46 39.48 39.48 39.46 39.46 39.47 39.47 39.48 39.49 39.51 39.55 39.57 39.58 39.58 39.59 39.59 39.60 39.59 39.59 39.59 39.59 39.58 39.57 39.56 39.56 39.55 39.56 39.52 39.53 LOWEST v-A 39.47 39.46 39.48 39.51 39.53 39.52 39.52 39.52 39.49 39.45 39.44 39.44 39.42 39.40 39.38 39.37 39.35 39.31 39.28 39.24 39.23 39.22 39.23 39.25 39.28 39.30 39.33 39.34 39.34 39.36 39.37 39.38 39.60 JULY 1 1 1992 WATER YEAR 39.38 39.40 39.41 39.41 39.42 39.42 39.43 39.47 39.51 39.52 39.51 39.52 39.53 39.54 39.55 39.56 39.55 39.56 39.55 39.55 39.55 39.56 39.57 39.57 39.57 39.57 39.57 39.56 39.56 39.55 39.51 21, 22, A 1993 39.55 39.55 39.53 39.52 39.51 39.51 39.50 39.50 39.52 39.53 39.54 39.54 39.55 39.56 39.56 39.56 39.57 39.57 39.58 39.58 39.58 39.58 39.58 39.58 39.58 39.56 39.55 39.55 39.54 39.53 39.52 39.55 23, 24, ~*\l^f 39.47 39.44 39.43 39.45 39.46 39.45 39.42 39.41 39.39 39.38 39.38 39.38 39.38 39.40 39.40 39.42 39.42 39.42 39.39 39.38 39.37 39.36 39.36 39.37 39.36 39.36 39.36 39.35 39.36 39.36 39.37 39.40 1994 X/w A -/• ^Vw^ 1994 39.36 39.35 39.34 39.32 39.31 39.31 39.31 39.29 39.29 39.28 39.29 39.28 39.28 39.28 39.28 39.27 39.28 39.28 39.29 39.29 39.28 39.28 39.28 39.29 39.30 39.29 39.27 39.25 39.25 39.24 39.29 GROUND-WATER LEVELS 431 RIO GRANDE DE HANATI BASIN 182308066260400. Local number, 210. LOCATION.--Lat 18*23'08", long 66*26'04", Hydrologic Unit 21010002, 4.88 mi southeast of Manati plaza, 5.24 mi southwest of Vega Baja plaza, and 2.25 mi west of Eseuela Bvaristo Camacho. Owners Gelo Martinez, Namet 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) . INSTRUMENTATION.--Digital water level recorder--60-minute punch. DATUM.--Elevation of land-surface datum is about 574 ft (174.9 m) above mean sea level, from topographic map. Measuring point: Top of shelter floor, 3.30 ft (1.01 m) above land-surface datum. Prior to January 14, 1993, 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. …