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Water Resources Data Puerto Rico and the U.S. Virgin Islands Water Year 1986 :::.°1-1°°G6N.1988 P'.1 ic Abitill4)4Ik t/s, R cCt St. Thomas Culebra. PR 4CZe O*6 St. Johr Vieques. PR VIRGIN ISLANDS St. Croix U.S. GEOLOGICAL SURVEY WATER-DATA REPORT PR-86-1 Prepared in cooperation with the Commonwealth of Puerto Rico, the Government of the U.S. Virgin Islands, and other agencies CALENDAR FOR WATER YEAR 1986 1985 OCTOBER NOVEMBER DECEMBER SMTWTF S S MTWT F S SMTW T F S 1 2 3 4 5 1 2 1 2 3 4 5 6 7 6 7 8 9 10 11 12 3 4 5 6 7 8 9 8 9 10 11 12 13 14 13 14 15 16 17 18 19 10 11 12 13 14 15 16 15 16 17 18 19 20 21 20 21 22 23 24 25 26 17 18 19 20 21 22 23 22 23 24 25 26 27 28 27 28 29 30 31 24 25 26 27 28 29 30 29 30 31 1986 JANUARY FEBRUARY MARCH SMTWTF S S MTWTF S SMTWTF S 1 2 3 4 1 1 5 6 7 8 9 10 11 2 3 4 5 6 7 8 2 3 4 5 6 7 8 12 13 14 15 16 17 18 9 10 11 12 13 14 15 9 10 11 12 13 14 15 19 20 21 22 23 24 25 16 17 18 19 20 21 22 16 17 18 19 20 21 22 26 27 28 29 30 31 23 24 25 26 27 28 23 24 25 26 27 28 29 30 31 APRIL MAY JUNE S MTWT F S S MTWTT F S SMTWT F S 1 2 3 4 5 1 2 3 1 2 3 4 5 6 7 6 7 8 9 10 11 12 4 5 6 7 8 9 10 8 9 10 11 12 13 14 13 14 15 16 17 18 19 11 12 13 14 15 16 17 15 16 17 18 19 20 21 20 21 22 23 24 25 26 18 19 20 21 22 23 24 22 23 24 25 26 27 28 27 28 29 30 25 26 27 28 29 30 31 29 30 JULY AUGUST SEPTEMBER SMTW T F S SMTW T F S SMTWTF S 1 2 3 4 5 1 2 1 2 3 4 5 6 6 7 8 9 10 11 12 3 4 5 6 7 8 9 7 8 9 10 11 12 13 13 14 15 16 17 18 19 10 11 12 13 14 15 16 14 15 16 17 18 19 20 20 21 22 23 24 25 26 17 18 19 20 21 22 23 21 22 23 24 25 26 27 27 28 29 30 31 24 25 26 27 28 29 30 28 29 30 31 Water Resources Data Puerto Rico and the U.S. Virgin Islands Water Year 1986 by Russell E. Curtis, Jr., Zaida Aquino, Pedro L. Diaz, and Rene Garcia Culebra, PR St. Thomas sC;:10 fC ) St. John Vieques, PR U.S. VIRGIN ISLANDS St. Crob U.S. GEOLOGICAL SURVEY WATER-DATA REPORT PR-86-1 Prepared in cooperation with the Commonwealth of Puerto Rico, the Government of the U.S. Virgin Islands, and other agencies UNITED STATES DEPARTMENT OF THE INTERIOR DONALD PAUL HODEL, Secretary. GEOLOGICAL SURVEY Dallas L. Peck, Director For additional information on the water resources investigation programs in Puerto Rico and the U.S. Virgin islands write to: Chief, C ribbean District, Water Resources Division U.S. Geological Survey GPO Box 4424 San Juan, PR 00936 (Telephone: (809) 753-4414) ERRATA SHEET REPORT: WATER RESOURCES DATA - PUERTO RICO AND THE U.S. VIRGIN ISLANDS - WATER YEAR 1986 PAGE 87.-- RIO GRANDE DE ARECIBO BASIN 50028000 RIO TANAMA NEAR UTUADO, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) JULY AUGUST SEPTEMBER 1 41 20 2.2 41 25 2.8 68 155 80 2 41 19 2.1 36 13 1.3 43 30 3.5 3 40 19 2.1 35 14 1.3 35 15 1.4 4 39 16 1.7 44 37 8.9 33 12 1.1 5 40 15 1.6 46 50 8.5 30 10 .81 6 43 13 1.5 35 10 .95 28 10 .76 7 41 15 1.7 126 952 3990 27 9 .66 8 40 18 1.9 57 61 10 27 9 .66 9 38 20 2.1 48 58 10 27 9 .66 10 36 20 1.9 51 90 36 26 9 .63 11 45 44 8.1 52 83 22 25 8 .54 12 39 18 1.9 36 12 1.2 25 8 .54 13 35 15 1.4 41 26 3.6 25 8 .54 14 55 91 26 36 18 1.7 24 8 .52 15 60 87 21 33 15 1.3 22 8 .48 16 56 87 21 30 13 1.1 22 8 .48 17 98 432 680 30 13 1.1 25 10 .84 18 59 93 17 30 12 .97 26 10 .70 19 43 50 5.8 30 12 .97 23 10 .62 20 61 105 27 30 12 .97 22 10 .59 21 59 65 14 28 12 .91 22 10 .59 22 44 25 3.0 29 12 .94 28 14 1.2 23 42 25 2.8 34 18 2.0 25 10 .68 24 47 37 5.4 33 15 1.6 24 9 .58 25 43 15 1.7 40 51 19 26 13 1.2 26 41 12 1.3 40 28 3.6 23 10 .62 27 43 14 1.6 29 10 .78 21 10 .57 28 42 12 1.4 36 19 2.2 30 20 2.0 29 40 12 1.3 60 93 39 25 10 .68 30 42 24 3.0 57 103 32 22 10 .59 31 44 27 3.7 39 28 2.9 --- --- --- TOTAL 1437 867.2 1292 4209.59 829 104.74 YEAR 25021 227330.80 PAGE 213.-- "Figure 23.-- Rio Guanajibo basin" should read "Figure 20.-- Southeastern river basins-- Rio Humacao to Rio Seco basins." PAGE 249.-- "Figure 20.--Southeastern river basins--Rio Humacao to Rio Seco basins." should read "Figure 23.-­ Rio Guanajibo basin." iii PKKFACE 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 person­ nel 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, process­ ing and tabulations of the data: Jose M. Agis Karl Johnson George Arroyo Rafael Pena-Cortes Angel Class Cacho Ana V. Sanchez Eloy ColOn-Dieppa Luis Santiago-Rivera Iris M. Concepcion Luis Soler Carlos Figueroa Jose A. Torres Javier Garcia Heriberto Torres-Sierra Ralph Gonzdlez Ricardo J. Vachier Felipe Hernandez This report was prepared in cooperation with agencies of the Commonwealth. of Puerto Rico, the Government of the U.S. Virgin Islands, and with other federal agencies under the general supervision of Allen L. Zack, District Chief, Caribbean District, San Juan, Puerto Rico. 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 6 3. Map showing location of maximum concentration of fecal coliform bacteria at sampled sites 10 4. Map showing location of maximum concentration of fecal streptococci bacteria at sampled sites 11 5. Map showing location of continuous surface-water and crest-stage gage stations in Puerto Rico 13 6. Map showing location of water-quality stations in Puerto Rico 14 7. Map showing location of ground-water sEations in Puerto Rico 15 8. Map showing location of surface-water stations in the U.S. Virgin Islands 16 9. Map showing location of ground-water stations in the U.S. Virgin Islands 17 10. Grid showing system for numbering wells and miscellaneous sites (latitude and longitude) 18 11. Map showing the Rio Guajataca basin 51 12. Map showing the Rio Camuy basin 63 13. Map showing the Rio Grande de Arecibo basin 69 14. Map showing the Rio Grande de Manati basin 93 15. Map showing the Rio Cibuco basin 111 16. Map showing the Rio de la Plata basic. 125 17. Map showing the Rio Hondo to the Rio Puerto Nuevo basins. 137 18. Map showing the Rio Grande de Loiza basin 153 19. Map showing northeastern river basins--the Rio Herrera to the Rio Anton Ruiz basins 189 20. Map showing southeastern river basins--the Rio Humacao to the Rio Seco basins 213 21. Map showing south coast river basins--the Rio Salinas to the Rio Jacaguas basins 227 22. Map showing south coast river basins--the Rio Inabon to the Rio Loco basins 233 23. Map showing the Rio Guanajibo basin 249 24. Map showing the Rio Yaguez and the Rio Grande de Afiasco basins 269 25. Map showing the Rio Culebrinas basin 279 V CONTENTS Page Preface iii List of surface-water and water-quality stations, in downstream List of ground-water wells, by basin, for which records are order, for which records are published viii published xii Introduction 1 Cooperation 2 Summary of hydrologic conditions 2 Surface water 3 Ground water 5 Water quality 7 Special networks and programs 9 Explanation of records 9 Station identification numbers 12 Downstream order system 12 Latitude-longitude system 12 Records of stage and water discharge 18 Data collection and computation 18 Data presentation 20 Identifying estimated daily discharge 23 Accuracy of the records 23 Records of surface-water quality 23 Classification of records 24 Arrangement of records 24 On-site measurements and sample collection 24 Water temperature 25 Sediment 26 Laboratory measurements 26 Data presentation 26 Remark codes 28 Records of ground-water levels 28 Data collection and computation 28 Data presentation 29 Records of ground-water quality 30 Data collection and computation 30 Data presentation 31 Access to WATSTORE data 31 Definition of terms 32 Publications on Techniques of Water-Resources Investigations 46 Surface- and quality-of-water records for Puerto Rico 49 Discharge at partial-record stations in Puerto Rico 287 Water-quality at partial-record stations in Puerto Rico 291 Ground-water records for Puerto Rico 300 Surface-water records for the U.S. Virgin Islands 335 Ground-Water records for the U.S. Virgin. Islands 341 Index 359 5077? -tot 1. REPORT NO. 1t. .1. Recipient's Accession No REPORT DOCUMENTATION PAGE USGS/WRD/HD-88/220 4. Title end Subtitle 6. Report Date April 1988 Water Resources Data for Puerto Rico and the U.S. Virgin 6. _Islands, Water Year 1986 7. Author(s) S. Performing Organization Rept. No. USGS-WDR-PR-86-1 Russell E, Curtis, Jr., Zaida Aquino, Rene Garcia, Pedro Diaz 9. Performing Organization Name and Address 10. Project/Task/Work Unit No. 11. U.S. Geological Survey, Water Resources Division Contract(C) or Grant(G) No. G.P.O. Box 4424 (C) San Juan, Puerto Rico 00936 (G) 12. Sponsoring Organization Name and Address 13. Type of Report 4 Period Covered Annual-Oct. 1, 1985 U.S. Geological Survey, Water Resources Division to Sept. 30, 1986 G.P.O. Box 4424 14. San Juan, Puerto Rico 00936 15. Supplementary Notes Prepared in cooperation with the Commonwealth of Puerto Rico, the Government of the U.S. Virgin Islands and other agencies. 16. Abstract (Limit: 200 words) Water-resources data for surface-water, quality-of-water, and ground-water records for the 1986 water year for Puerto Rico and the U.S. Virgin Islands, consists of records of discharge, water quality of streams, and water levels of wells. This report contains discharge records for 50 streamflow-gaging stations, and 2 crest-stage, partial-record streamflow stations; stage records for 1 lagoon; water quality records for 16 streamflow-gaging stations, 45 ungaged streamsites, 11 lake sites, 1 lagoon, and 1 bay; and water-level records for 57 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. 17. Document Analysis a. Descriptors *Surface water, *Water quality, *Ground water, Aquifers, Chemical analysis, Gaging Stations, Hydrologic data, Sediments, Streamflow, Water analysis, Water levels, Lakes. b. Iciontifiers/Open•Ended Terms Puerto Rico, U.S. Virgin Islands, Sampling sites. c. COSATI Field/Group 13. Availability Statement 19. Security Class (This Report) 21. No. of Pages NO RESTRICTION ON DISTRIBUTION UNCLASSIFIED 376 20. Security Class (This Page) 22. Price UNCLASSIFIED ___. as ANSI-239. See Mai/ructions on Mowers* OPTIONAL FORM 272 (4-- VII TABLES Page Table 1. Island-wide monthly precipitation averages for 1986 water year 2. Peak discharges during Oct. 6-7, 1985 at selected U.S. Geological Survey streamflow stations through- out Puerto Rico 3 3. Highest water level (in feet below land-surface datum) recorded during 1985 water year at selected ground­ water wells in Puerto Rico and the U.S. Virgin Islands 4. Sites with maximum concentration of selected parameters 5. Factors for conversion of chemical constituents in milli- grams per liter to milliequivalents per liter 7 8 37 VIII SURFACE-WATER AND WATER-QUALITY STATIONS, IN DOWNSTREAM ORDER, FOR WHICH RECORDS ARE PUBLISHED (Letter after station name designates type of data: (d) discharge, (c) water-quality, (e) elevation) Page RIO GUAJATACA BASIN Rio Guajataca at Lares (c) 52 Rio Guajataca above Lago Guajataca (d) 54 Canal Principal de Diversiones at Lago Guajataca (c) 56 Rio Guajataca below Lago Guajataca (d) 58 Rio Guajataca above mouth near Quebradillas (dc) 60 RIO CAMUY BASIN Rio Camuy near Bayaney (d) 64 Rio Camuy near Hatillo (d) 66 RIO GRANDE DE ARECIBO BASIN Rio Grande de Arecibo near Adjuntas (c) 70 Rio Grande de Arecibo near Utuado (c) 72 Rio Caonillas above Lago Caonillas near Jayuya (c) 74 Rio Grande de Arecibo below Lago. Dos Bocas near Florida (c) 76 Rio Grande de Arecibo above Arecibo (d) 78 Rio Tanama near Utuado (dc) 80 Rio Tanana at Charco Hondo (d) 88 Rio Grande de Arecibo at Central Cambalache (c) 90 RIO GRANDE DE MANATI BASIN Rio Orocovis near Orocovis (c) 94 Rio Grande de Manati near Morovis (dc) 96 Rio Grande de Manati at Ciales (d) 99 Rio Grande de Manati at Highway 149 at Ciales (c) 101 Rio Cialitos at Highway 649 at Ciales (c) 103 Rio Grande de Manati at Highway 2 near Manati (dc) 105 LAGUNA TORTUGUERO BASIN Laguna Tortuguero Outlet near Vega Baja (c) 110 RIO CIBUCO BASIN Rio Cibuco below Corozal (dc) 112 Rio Cibuco at Vega Baja (dc) 115 Drainage Ditch below Warner Lambert Laboratory near Sabana (c). 118 Drainage Ditch at Rio Cibuco below Central San Vicente (c) 120 Rio Cibuco below Central San Vicente (c) 122 RIO DE LA PLATA BASIN Rio de La Plata at Proyecto La Plata (dc) 126 Rio de La Plata near Comerio (c) 129 Rio Guadiana near Naranjito (c) 131 Rio de La Plata at Toa Alta (c) 133 Rio de La Plata at Highway 2 near Toa Alta (d) 136 RIO HONDO BASIN Rio Hondo at Flood Channel near Cataflo (c) 138 IX SURFACE-WATER AND WATER-QUALITY STATIONS, IN DOWNSTREAM ORDER, FOR WHICH RECORDS ARE PUBLISHED—Continued Page RIO DE BAYAMON BASIN Rio de Bayamon near Aguas Buenas (c) 140 Rio Guaynabo near BayamOn (c) 142 Rio de Bayamon at Flood Channel at Bayamon (c) 144 RIO PUERTO JUE1.10 BASIN Rio Piedras: Rio Piedras near Rio Piedras (c) 146 Laguna San Jose: Bahia de San Juan: Rio Piedras at Hato Rey (c) 148 Laguna San Jose No.2 at San Juan (c) 150 Bahia de San Juan No.5 at San Juan (c) 151 QUEBRADA BLASINA BASIN Quebrada Blasina near Carolina (c) 154 RIO GRANDE DE LOIZA BASIN Rio Grande de Loiza at Quebrada Arenas (d) 156 Quebrada Blanca at El Jagual (d) Rio Gurabo: 158 Quebrada Salvatierra near San Lorenzo (d) 160 Rio Cayaguas at Cerro Gordo (d) 162 Rio Turabo at Borinquen (d) 164 Rio Grande de Loiza at Caguas (dc) 166 Rio Caguitas at Highway 30 at Caguas (c) 169 Rio Bairoa near Caguas (c) 171 Quebrada Caimito near Juncos (d) 173 Rio Valenciano near Juncos (d) 175 Quebrada Mamey near Gurabo (d) 177 Rio Gurabo at Gurabo (d) 179 Rio Gurabo near Gurabo (c) 181 Lago Loiza at Damsite (c) 183 Rio Grande de Loiza below Trujillo Alto (c) 184 Rio Canovanas near Campo Rico (d) 186 RIO ESPIRITU SANTO BASIN Quebrada Sonadora near El Verde (d) 190 Quebrada Toronja at El Verde (d) 192 Rio Espiritu Santo near Rio Grande (dc) 194 RIO MAMEYES BASIN Rio Mameyes near Sabana (d) 197 RIO SABANA BASIN Rio Sabana at Sabana (d) 199 RIO FAJARDO BASIN Rio Fajardo near Fajardo (dc) 203 Rio Fajardo below Fajardo (c) 209 X SURFACE-WATER AND WATER-QUALITY STATIONS, IN DOWNSTREAM ORDER, FOR WHICH RECORDS ARE PUBLISHED--Continued Page RIO BLANCO BASIN Rio Icacos near Naguabo (d) 211 RIO HUMACAO BASIN Rio Humacao at Highway 3 at Humacao (c) 214 RIO GUAYANES BASIN Rio Guayanes at Yabucoa (c) Rio Guayanes above mouth at Playa de Guayanes (c) 216 218 RIO MAUNABO BASIN Rio Maunabo at Maunabo (c) 220 RIO CHICO BASIN Rio Chico at Providencia (c) 222 RIO GRANDE DE PATILLAS BASIN Rio Grande de Patillas near Patillas (dc) 224 RIO COAMO BASIN Rio Coamo near Coamo (c) 228 RIO DESCALABRADO BASIN Rio Descalabrado near Los Llanos (d) 230 RIO JACAGUAS BASIN Rio Jacaguas at Juana Diaz (d) 231 RIO INABON BASIN Rio Inabon at Real Abajo (d) 234 RIO BUCANA BASIN Rio Bucand: Rio Cerrillos near Ponce (c) 236 RIO PORTUGUES BASIN Rio Portugues near Ponce (dc) Rio Portugues at Ponce (c) 238 241 RIO GUAYANILLA BASIN Rio Guayanilla near Guayanilla (d) Rio Guayanilla at Central Rufina (c) 243 244 RIO LOCO BASIN Rio Loco at Guanica (c) 246 LAGUNA CARTAGENA BASIN Laguna Cartagena near Boqueron (e) Laguna Cartagena Outflow near Boqueron (d) 250 251 XI SURFACE-WATER AND WATER-QUALITY STATIONS, IN DOWNSTREAM ORDER, FOR WHICH RECORDS ARE PUBLISHED--Continued Page LAGUNA JOYUDA BASIN Quebrada Mamey at Joyuda (d) 253 RIO GUANAJIBO BASIN Rio Guanajibo near San German (c) 254 Rio Rosario at Rosario (d) 256 Rio Rosario near Hormigueros (dc) 257 Rio Guanajibo near Hormigueros (dc) 265 RIO YAGUEZ BASIN Rio YagUez near Mayaguez (c) 270 RIO GRANDE DE AFTASCO BASIN Rio Grande de Afiasco near Lares (c) 272 Rio Grande de Afiasco near San Sebastian (dc) 274 Rio Grande de Afiasco near Afiasco (c) 277 RIO CULEBRINAS BASIN Rio Culebrinas near San Sebastian (c) 280 Rio Culebrinas at Highway 404 near Moca (d) 282 Rio Culebrinas near Aguada (c) 284 ST. THOMAS, U.S. VIRGIN ISLANDS Bonne Resolution Gut at Bonne Resolution (d) 337 Turpentine Run at Mariendal (d) 338 ST. JOHN, U.S. VIRGIN ISLANDS Guinea Gut at Bethany (d) 339 ST. CROIX, U.S. VIRGIN ISLANDS Jolly Hill Gut at Jolly Hill (d) 340 305 310 315 320 325 330 XH GROUND-WATER WELLS, BY BASIN, FOR WHICH RECORDS ARE PUBLISHED Page RIO GUAJATACA BASIN Well 182422067015100 Local number 165 303 Well 182647066552400 Local number 202 304 RIO CAMUY BASIN Well 182856066510700 Local number 203 RIO GRANDE DE ARECIBO BASIN Well 182737066370900 Local number 204 306 RIO GRANDE DE MANATI BASIN Well 182621066343300 Local number 135 307 Well 182757066325600 Local number 206 308 Well 182710066303700 Local number 207 309 Well 182534066283000 Local number 208 Well 182634066262500 Local number 209 311 Well 182308066260400 Local number 210 312 RIO CIBUCO BASIN Well 182647066201700 Local number 70 313 Well 182615066235300 Local number 211 314 Well 182515066194000 Local number 212 Well 182330066185700 Local number 213 316 RIO DE LA PLATA BASIN Well 182746066170800 Local number 214 317 Well 182548066171200 Local number 215 318 Well 182530066135400 Local number 216 319 Well 182655066142400 Local number 217 RIO HONDO TO RIO PUERTO NUEVO BASINS Well 182623066111000 Local number 218 321 Well 182441066082600 Local number 219 322 Well 182413066044000 Local number 220 323 Well 182436066031200 Local number 221 324 RIO GRANDE DE LOIZA BASIN Well 182515065594100 Local number 222 RIO HUMACAO TO RIO SECO BASINS Well 175858066100200 Local number 6 326 Well 180415065513900 Local number 96 327 RIO SALINAS TO RIO JACAGUAS BASINS Well 175829066232100 Local number 87 328 RIO INABON TO RIO LOCO BASINS Well 180133066503300 Local number 132 329 Well 175950066354200 Local number 141 XIII RIO GUANAJIBO BASIN Well 180132067033800 Local number 143 331 RIO CULEBRINAS BASIN Well 182018066593200 Local number 83 332 Well 182442067091700 Local number 200 333 ST. CROIX, U.S. VIRGIN ISLANDS Well 174225064471900 Local number 1 343 Well 174225064472000 Local number 2 344 Well 1;4243064475100 Local number 3 345 Well 174245064475800 Local number 4 346 Well 174336064523200 Local number 5 346 Well 174308064484400 Local number 6 347 Well 174525064460600 Local number 7 348 Well 174527064460100 Local number 8 348 Well 174532064460300 Local number 9 349 Well 174329064454700 Local number 10 349 ST. THOMAS, U.S. VIRGIN ISLANDS Well 182050064580400 Local number 1 350 Well 182138064543100 Local number 2 350 Well 182138064542500 Local number 3 350 Well 182136064541900 Local number 4 351 Well 182029064535200 Local number 5 351 Well 182038064550300 Local number 6 352 ST. JOHN, U.S. VIRGIN ISLANDS Well 182010064472600 Local number 1 353 Well 182109064460300 Local number 2 353 Well 182116064451000 Local number 3 354 Well 182042064454500 Local number 5 355 Well 182044064454600 Local number 6 356 Well 182044064454800 Local number 7 356 Well 182044064454900 Local number 8 356 Well 182044064455000 Local number 9 357 Well 182044064455200 Local number 10 357 Well 181956064464500 Local number 11.... 358 1 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 INTRODUCTION The Water Resources Division of the U.S. Geological Survey, in coopera­ tion 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 inLerested 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, 1986." This report includes records on both surface and ground water. Specifi­ cally, it contains: (1) Discharge records for 50 streamflow-gaging stations, and 2 crest-stage, partial-record streamflow station; (2) stage records for 1 lagoon; (3) water-quality records for 16 streamflow-gaging stations, and for 45 ungaged streamsites, 11 lake sites, 1 lagoon, and 1 bay; and (4) water- level records for 57 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, and 1985 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 Geolog­ ical Survey for all States. These official Survey reports have an identifica­ tion 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-86-1". These water-data reports are for sale in paper copy or in microfiche by the National Technical Information Service, U.S. Department of Commerce, Springfield, Virginia, 22161. Additional information, including current prices, for ordering specific reports may be obtained from the District Chief at the address given on back of title page or by telephone (809) 783-4660. 2 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 COOPERATION The U.S. Geological Survey has had cooperative agreements with organiza­ tions of the Commonwealth of Puerto Rico and the Territory of the U.S. Virgin Islands for the systematic collections of water resources data since 1958. Organizations that supplied data are acknowledged in the station descriptions. Organizations that assisted in collecting data through cooperative agreements with the Survey are: Puerto Rico Environmental Quality Board Puerto Rico Aqueduct and Sewer Authority Puerto Rico Department of Agriculture Puerto Rico Industrial Development Company Puerto Rico Department of Public Works Puerto Rico Highway Authority Puerto Rico Department of Natural Resources Puerto Rico Department of Health Puerto Rico Electric and Power Authority Puerto Rico Rice Corporation Puerto Rico Administration for Agricultural Development Puerto Rico Land Administration Center for Energy and Environment Research, University of Puerto Rico Water Resources Research Institute, University of Puerto Rico Water Resources Research Institute, College of the. Virgin Islands Department of Public Works of the U.S. Virgin Islands Funds were also provided by the Corps of Engineers, U.S. Army, for the collection of records at five gaging stations published in this report. Ground-water quality data at selected sites was collected with support from the U.S. Environmental Protection Agency. SUMMARY OF HYDROLOGIC CONDITIONS Precipitation was slightly higher than usual in the 1986 water year. The average was about 118 percent of normal, islandwide, with variations of 116 percent normal in the north; 123 percent normal in the south; 120 percent normal in the east; and 112 percent normal in the west. Monthly average precipitation islandwide for water year 1986 and the 30-year normal as reported by the National Oceanic and Atmospheric Admministration are listed in table 1. 3 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 Table 1. Island-wide monthly precipitation averages for 1986 water year 30-year Water year 1986 normal (inches) (inches) Oct. 20.60 7.74 Nov. 6.58 5.95 Dec. 1.64 4.32 Jan. 2.56 3.08 Feb. 1.76 2.29 Mar. 2.67 2.62 Apr. 7.41 4.63 May 15.14 6.48 June 2.97 5.58 July 4.11 4.48 Aug. 6.00 7.28 Sept. 3.17 7.78 TOTAL 74.61 62.23 Surface Water Streamflow in Puerto Rico was generally within normal range during the 1986 water year (fig. 1). During October it was well above normal due to increased precipitation caused by a tropical wave. This event produced monthly-mean discharges that were 162 to 522 percent of the long-term median at all index stations. Historical maximum peak flows were recorded for some sites and are shown in table 2. An estimated 180 people died, and millions of dollars in losses occurred as a result of severe floods and landslides in the southern and central areas. Streamflow began to decrease to the normal range during November, but was still excessive in the northern and eastern areas. From December to March, streamflow decreased seasonally to normal levels, although some stations were slightly below or above average. After this moderate drought season, above normal precipitation during April increased streamflow above the long-term median with normal to excessive flows. They continued increasing during May when the highest and second highest monthly- mean flows were exceeded at Rio Grande de Afiasco near San Sebastian on the west coast, and Rio Grande de Manati on the north coast. However, the northern and eastern areas were the most affected, where some gaging stations recorded maximum peak discharges for the water year. Similar high-flow conditions persisted for the west and north coasts during June and July, but flow began to decline to normal limits in the eastern and southern areas by June, and was lower than usual by July. 4 4 RIO GRANDE DE AIjASCO NEAR RIO GRANDE DE MANATI SAN SEBASTIAN (50144000) AT HWY 2 (50038100) 2000 8000 ' "vxxxknknkkkk CURRENT YEAR Oftwfto AM:441APe 1000 *VIVO!' 1000 •Al* 100 44$$$$ M ONTHLY MEANDISCHARGE, INCUBICFEETPER SECOND 100 50 RIO FAJARDO NEAR FAJARDO (50071000) 1000 144$04444mv .4Ag**Wo‘ 1$$$$$$*ht 44$$$$W 100 $OW 10 3 > z CO Er Z J CD EL 0 1.4.1 4:c a_ Lehi d't Z —) < 1985 1986 "4"" ' nmAA404v4NNNNNftqqqq&L, .1.42.444+*"**.-44444 68RNNNOWAmwmAA0...4 4001Wow. 44MON.044.4A1111111 v1 .4.4.4.4No____lv 4 30 RIO INABON AT REAL ABAJO (50112500) MONTH LY MEANDISCHARGE, INCUBICFEETPERSECOND Unshaded area indicates range between highest and lowest record for the month Figure 1.--Monthly mean discharge of selected streams in Puerto Rico. 5 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 In August increased flows occurred islandwide and averaged 109 percent above the long-term median, compared with an average of 38 percent of the median during September. Steamflow ranged from about 28 percent of the median in Rio Inabon at Real Abajo to 137 percent of the median in Rio Fajardo near Fajardo. Record low flows for August occurred at two index stations. Monthly-mean discharges at Rio Inabon at Real Abajo and Rio Grande de Afiasco near San Sebastian sites were an all-time low for the entire period of record (23 years) at those sites. In the U.S. Virgin Islands, conditions were generally the same as in Puerto Rico. The passing of the tropical wave during October 1985, produced precipitation 224 percent above the 30-year norm for this month. For the rest of the year it was below normal except for April and May when it was 260 and 226 percent above normal respectively. Table 2. Peak discharges during October 6-7, 1985 at selected U.S. Geological Survey streamflow gaging stations throughout Puerto Rico 1986 peak Previous maximum of record Period Station Station (Cubic feet (Cubic feet Water of number name per second) per second) Year Record 50011200 Rio Guajataca below 1,350 624 1985 8-69 to 12-70, Lago de Guajataca 4-84 to 9-86 50014800 Rio Camay near Bayaney 6,450 3,510 1985 5-84 to 9-86 50015700 Rio Camuy near Hatillo 10,500 6,250 1985 6-84 to 9-86 50038100 Rio Grande de Manati 97,200 90,000(revised) 1985 10-63 to 9-68, Highway 2 near Manati 2-70 to 9-86 50055650 Quebrada Caimito 992 700 1985 1-84 to 9-86 near Juncos 50108000 Rio Descalabrado near 30,000 7,000 1969 1-66 to 12-69, Los Llanos 2-84 to 9-86 50111500 Rio Jacaguas at 40,000 12,700 1985 3-84 to 9-86 Juana Diaz 50112500 Rio Inabon at Real Abajo 19,000 5,720 1970 7-64 to 7-70, 4-71 to 9-86 50115000 Rio Portugues near Ponce 21,000 13,100 1975 7-64 to 9-86 Ground Water In general, ground-water levels in selected wells rose during October and May in response to above-normal rainfall. New record-high water levels were recorded at several wells in Puerto Rico and the U.S. Virgin Islands (Table 3). 6 WATER LEVEL INFEETBELOW LAND-SURFACE DATUM 275 14 T 4 WELL 135, LEDERLE BARCELONETA, P.R. 280 285 OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1985 1986 15 20 25 +"1.11\114 ,J1 30 WELL 87, ALOMAR 1 SANTA ISABEL, P.R. 35 OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1985 1986 0 ► ► ► ► 10 20 WELL 11, GUINEA GUT ST. JOHN, U.S.V.I. 30 OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1985 1986 Figure 2.--Ground-water levels at selected wells in Puerto Rico and the U.S. Virgin Islands. WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 Ground-water levels along the north coast limestone aquifers of Puerto Rico remained practically unchanged during the first half of the water year (fig. 2). Above normal rainfall during mid-May caused a significant rise in the water levels. At the Lederle recording well, an increase of 2.5 ft was registered. The water levels declined during the rest of the period, reachirig nearly steady conditions by September 1986. Ground-water levels in the south coast alluvial aquifers of Puerto Rico followed a cyclic pattern associated with rainfall and ground-water withdrawals for public supply, industrial, and irrigation uses. Above-normal rainfall produced by a tropical depression that affected south-central Puerto Rico during October 6-7, 1985, caused a significant rise in the water levels (fig. 2). At the Alomar well, an increase of 4.5 ft in the water levels was recorded, while at nearby recording wells a maximum increase of 22.0 ft was recorded. The water levels decreased during the rest of the year in response to water demand for irrigation and diminished precipitation. Table 3. Highest water level and previous extreme (in feet below land-surface datum) recorded during 1986 water year at selected ground-water wells in Puerto Rico and the U.S. Virgin Islands Well Local Location 1986 Date Previous Date Period of Name no. extreme extreme Record Yabucoa #7 96 PR 13.39 11-18-85 15.38 12-09-84 4-78 to 9-86 Restaurada 8A 141 PR 11.19 10-09-85 15.65 08-20-83 10-81 to 9-86 Vivoni well 143 PR 37.86 11-20-85 38.00 09-19-82 12-81 to 9-86 Guinea Gut 11 St. John 3.05 06-13-86 3.34 05-25-82 3-82 to 9-86 Fairplains #2 2 St. Croix 20.91 11-27-85 21.80 01-03-84 6-83 to 9-86 Grade School 3 6 St. Thomas 3.72 05-22-86 5.19 11-27-84 3-82 to 9-86 Ground-water levels in the U.S. Virgin Islands (St. Thomas, St. Croix, and St. John) responded to the same climatological conditions that affected Puerto Rico. Above-normal rainfall during October and May resulted in an increase in water levels of 17.8 ft. and 20.5 ft respectively at the Guinea Gut recording well (fig. 2). Water Quality As part of the ongoing interagency agreement, the U.S. Geological Survey completed the second year of sampling for selected parameters which were added to the regular schedule in 1985. These parameters are part of a wider set of constituents studied to detect the effects of pollution on the streams and lakes in Puerto Rico. 8 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 Table 4. Sites with maximum concentration of selected parameters Boron Copper Manganese B Cu Mn Site number 50047530 50055250 50146000 Site name Rio Hondo at Rio Caguitas Rio Grande de flood channel at Highway 30 Afiasco near near Catafio at Caguas Afiasco Maximum 0.97 mg/L 0.22 mg/L 1.7 mg/L concentrations Iron Zinc Cyanide Fe Zn Site number 50146000 50063800 50-055250 Site name Rio Grande de Rio Espiritu Rio Caguitas Afiasco near Santo near El at Highway 30 Afiasco Verde Rio Grande at Caguas Maximum 50 mg/L 0.24 mg/L 0.220 mg/L concentrations Phenols Sulfide MBAS * Site number 50091800 50048800 50091800 Site name Rio Chico at Rio Piedras Rio Chico at Providencia near Rio Piedras Providencia Maximum 42 mg/L 14 mg/L 5,1 mg/L concentrations * MBAS - Methylene blue active substances. 9 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 The presence of high concentrations of fecal coliform (FC) and fecal streptococci (FS) bacteria continue being the principal water quality problem of Puerto Rico. Bacteria concentrations exceeding one million colonies per hundred milliliters of raw water were found at several stations including Rio Hondo at flood channel near Cataiio (50047530), Rio Piedras at Hato Rey (50049100), Rio Caguitas at Highway 30 at Caguas (50055250), Rio Bairoa near Caguas (50055400), and Rio Chico at Central Providencia (50091800) (fig. 3 and 4). These sites are located close to urban zones, industrial parks, and suburban zones and receive the direct discharge from sewage treatment plants. Three suspended sediment stations were operated during the year at Rio Tanana near Utuado (50028000), located in the north central part of the island; Rio Fajardo near Fajardo (50071000) in the east, close to El Yunque Rain Forest; and Rio Rosario near Hormigueros (50136400) in the west, close to the Maricao Forest Reserve. Maximum sediment concentrations recorded were 9,340 mg/L at 50028000, 2,210 mg/L at 50071000, and 8,150 mg/L at 50136400. Maximum sediment loads were 79,900 tons per day (ton/d) at 50028000, 22,100 ton/d at 50071000, and 74,700 ton/d at 50136400. SPECIAL NETWORKS AND PROGRAMS National Stream Quality Accounting Network (NASQAN) is a nationwide data-collection network designed by the U.S. Geological Survey to meet many of the information needs of government agencies and other groups involved in natural or regional water-quality planning and management. The 500 or so sites on NASQAN are generally located at the downstream ends of hydrologic accounting units designated by the U.S. Geological Survey Office of.Water Data Coordination in consultation with the Water Resources Council. The objectives of NASQAN are (1) to obtain information on the quality and quantity of water moving within and from the United States through a systematic and uniform process of data collection, summarization, analysis, and reporting such that the data may be used for, (2) description of the areal variability of water quality in the Nation's rivers through analysis of data from this and other programs, (3) detection of changes or trends with time in the pattern of occurrence of water-quality characteristics, and (4) providing a nationally consistent data base useful for water-quality assessment and hydrologic research. EXPLANATION OF THE RECORDS The surface-water and ground-water records published in this report are for the 1986 water year that began October 1, 1985 and ended September 30, 1986. A calendar of the water year is provided on the inside of the front cover. The records contain streamflow data, stage and content data for lakes and reservoirs, 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 9. 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. 1 67°15' 67°00' 18030' Rio Cuiabrira Rio i.,uayabo Rio Grand Rio Grande de /Masco Rio Yaguez Rio Guanajibo l6°00' 0 0 110 210 KILOMETERS 0 10 20 MILES I ATLANTIC $; 41' e§b:cs ' 0 ($1> 0 0 0 V. 1• /406° 04e19 0 e 0 40 00 ckt‘e c.$vko .1/42'RS0 Oti‘ k0 0e ,b0.1/40 4 04> 0 4 ko 0 f c A e e0 0° 4' 1/o co 4 15' 66000' OCEAN 0- ,00 p .3i 0 I) %IS, .4) e 0 Q. 1/4o Ao 2,0 0 ‘2% 1/4o 0 1/40 ko 1/0 4 CARIBBEAN SEA 0 ei .Zk fi4 ' 1 /4o 45' ,0 •‘,0 1/,0 4 1/4o Rio Fajardo Rio Daguao brada Palma Rio Santiago Rio Bianco Rio Antall Ruiz Rio Humacao to Guayana's FECAL COLIFORMS • < 1000 • 1000 - 10,000 II 10,000 - 100,000 11100,000 - 1.000,000 > 1,000,000 Figure 3.--Location of maximum concentration of fecal coliform bacteria at sampled sites. I 45' 65°30' 67°15' 67°00' 4 ' 30' 15' 66°00' • — -r -r ATLANTIC OCEAN 040 1/4 sc, 4' 4, NO -) 0 0 C&OP \° k° 0v e t o . e w 18°30' % 4s) 4C ee, • °IP o 446 tts, ko (2- Rio Culebrinas + p Rio Guayabo Rio Grande Rio Fajardo Rio Grande de Masco 15' Rio Yaguez Rio Daguao Quebrada Palma Rio Guanajibo \ Rio Santiago Rio Blanco Rio Antol, Ruiz Rio Humacao to Guayaas 18°00'I- oo A. o co to ,k 40 1,0 o 4000 0 0‘ FECAL STREPTOCOCCI. •A'b &t*/* .40 Oc" \aPcjol* o 00 ‘0 (0 0 cfr 1/40 , v 0 4$, • < 1 000 q. 10 1/4o i‘o (kw • 1000 - 10,000 4re 9, to 10,000 - 100,000 t 0 • 9.` 17°45 0 10 20 KILOMETERS • 10 0 ,000 - 1,000,000 6 20 MILES > 1,000,000 CARIBBEAN SEA Figure 4.--Location of maximum concentration of fecal streptococci bacteria at sampled sites. 12 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 Station Identification Numbers Each data station, whether streamsite or well, in this report is assigned a unique identification number. This number is unique in that it applies specifically to a given station and to no other. The number usually is assigned when a station is first established and is retained for that station indefinitely. The systems used by the U.S. Geological Survey to assign identification numbers for surface-water stations and for ground-water well sites differ, but both are based on geographic location. The "downstream order" system is used for regular surface-water stations and the "latitude­ longitude" system is used for wells. Downstream order system Since October 1, 1950, the order of listing hydrologic-station records in Survey reports is in a downstream direction along the main stream. All stations on a tributary entering upstream from a main-stream station are listed before that station. A station on a tributary that enters between two main-stream stations is listed between them. A similar order is followed in listing stations in first rank, second rank, and other ranks of tributaries. As an added means of identification, each hydrologic station and partial-record station has been assigned a station number. These are in the same downstream order used in this report. In assigning station numbers, no distinction is made between partial-record stations and other stations; therefore, the station number for a partial-record station indicates down­ stream order position in a list made up of both types of stations that may be established; hence, the numbers are not consecutive. The complete 8-digit number for each station such as 50028000, which appears just to the left of the station name, includes the 2-digit part number "50" plus the 6-digit downstream order number "028000." Latitude-Longitude System The 8-digit downstream order station numbers are not assigned to wells and miscellaneous sites where only random water-quality samples or discharge measurements are taken. The well and miscellaneous site numbering system of the U.S. Geological Survey is based on the grid system of latitude and longitude. The system provides the geographic location of the well or miscellaneous site and a unique number for each site. The number consists of 15 digits. The first 6 digits denote the degrees, minutes, and seconds of latitude, the next 7 digits denote degrees, minutes, and seconds 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. 10). 67015' 183O' Rio Culebrinas Rio Guayabo 'Rio Grande RioGrande de Masco Rio Yaguez Rio Guanajibo 18000' 170451L p 0 10 67°00 4 5' 30' 15' 66°00' 45' 65°30' 1 A TLANTIC OCEAN 1 ik AO 0 i, e's, '' $‘0 o e i%t‘ bG 0“) ik .0 s% £0114 £0157 .0381 40395 A0112 6,\ 027750 ____400400 ) 024141 1474 03832 Air4( Rio Fajardo 350. i140 "Aik 8 2.\/ 5' Rio Daguao - 1440 Quebrada Palma 0400A 053050 \ Rio Santiago Rio Blanco 0 Rib Aatoll Ruiz lb Humacao 4490 I RA) Guayatie's 111$ 429899,1299 0 .0 se c, 0 c, eci o EXPLANATION , "Joe 0 V be . Os° C 0 oS° () cv ,0 0 SURFACE WATER STATIONS 1125 CONTINUOUS STREAMFLOW 20 KILOMETERS • STATION 20 MILES A1159 CREST-STAGE GAGE CARIBBEAN - A 1 L L Figure 5.--Location of continuous surface-water and crest-stage gage stations in Puerto Rico. Lao ;au 6715' 67°00 45' 30' 15' 66°00' 45' 65°30' I --7- tN at ATLANTIC 0 C Eli 0 10 4C ‘44 0$‘ 39150, 0 V" 0 ' e ,tt, <Z, 0 o 030 . , , e e e 18°30' 4 ee 03965° to 90 4' c,: N „.0 ---- / 0114 38 0290 0395 47530 Rio Culebrinas 0381,7 04691,- 1r-0116 , Rio Guayabo 1491 0491 ir ----7.048510 Rio Grand ' 010790 L 047990 3,-059( 11r010720 ' 311(-027250 038320-044 0 ) '04'88 0590 3,0,27090 1476 0444 V 411C-0355,, 0280 025110 /0554 0588 Rio Grande 0 4950 0575 \ 01812\ / de Masco 055250 0440 W051(025 ,Y,C0476 *0 307 0550, Rio Yaguez k Rio Daguao Quebrada Palma Rib Guanailbo Rio Santiago 13 0430‘r Rio Blanco Rib Antolt Ruiz 03995 0865,, Rib Humacao 1966 /big 0835tr Guayan6 0920W, t\Oki 0 18000' $ 1001 x II 0 w2. • ; Psso dfr t, EXPLANATION o ,s% d,0 + ,§) .0 ‘, t 0 Po ‘e. 0 ov QUALITY-OF-WATER STATIONS 0 v,c0 CtAo q. 10,0 %.1 P ko b 10 14) o ko AO,0 y Q.b sql‘ kO V 0430 BIOLOGICAL kvo 4 0 3, 0820 CHEMICAL 17°45' 20 K L OME TERS 0710 SEDIMENT (DAILY) 20 MILES 10 CARIBBEAN SEA 1,-0910 SEDIMENT (BI-MONTHLY) Figure 6.--Location of water-quality stations in Puerto Rico. 67°15' 67000' 45' 30' 15' 66°00' 45' 65°30' ATLANTIC OCEAN C:b 4•42* 00 ‘ur eIN tO v %o C., C,' db o e p Np t* ,Att 18G30,.. + 0o60 eev ,0 2140°21 1 V to cA o 0 e Rio Cuiebrina Rio Guayabo Rio Grand Rio Fa/atdo Rio Grande de Anasc Rio Vague Dagua Quebrada Palma Rio Guanajibo Rio Santiago Rio Bianco Rio Antoil Ruiz Rio Humacao Rio Guayan6 18006I- r, 00# ue , O tp o- ,s, (.20 • Os: 00. 0 Nr• " o D c.. 6e '(‘- 4P * EXPLANATION 17°451', 0 -fp 20 KILOMETERS • 6 WELL AND WELL NUMBER 10 20 MJLES CARIBBEAN SEA Figure 7.--Location of ground-water stations in Puerto Rico. rt 16. 65°05' 2 3 4 KILOMETERS 3 4 MILES 18°22' 18c) 6450' 45' 40' 640 ST. CROIX 171)4 Christiansted Fred 0 1 2 3 4 KILOMETERS I 1 I 1 1 -17 '40' 0 1 2 3 4 MILES Figure 8.--Location of surface-water stations in the U.S. Virgin Islands. 17 °METERS 1 4 MILES Figure 9.--Location of ground-water stations in the U.S. Virgin Islands. 18 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 66°53' 52' 51' 50' 49' 48' 66°47' 18°02' 0I' 134 132•1 *27 .74 COORDINATES FOR WELLS 27 (180150066474900) AND 74 (1801350664 7 1000) -­e 131 *\ COORDINATES FOR WELLS 132 (180133066503300) AND 134 (1801200665032001 18 0 0T 17 0 59' 16 41 COORDINATES FOR WELL 131 (180058066502700) COORDINATES FOR WELL 16 (175922088495800) Figure 10.--Grid showing system for numbering wells and miscellaneous sites (latitude and longitude). Records of Stage and Water Discharge Records of stage and water discharge may be complete or partial. Complete records of discharge are those obtained using a continuous stage- recording device through which either instantaneous or mean daily discharges may be computed for any time, or any period of time, during the period of record. Complete records of lake or reservoir content, similarly, are those for which stage or content may be computed or estimated with reasonable accuracy for any time, or period of time. They may be obtained using a continuous stage-recording device, but need not be. Because daily mean discharges and end-of-day contents commonly are published for such stations, they are referred to as "daily stations." By contrast, partial records are obtained through discrete measurements without using a continuous stage-recording device and pertain only to a few flow characteristics, or perhaps only one. The nature of the partial record is indicated by table titles such as "Crest-stage partial records," or "Low­ flow partial records." Records of miscellaneous discharge measurements or of measurements from special studies, such as low-flow seepage studies, may be considered as partial records, but they are presented separately in this type of report. Location of all complete-record and crest-stage partial-record stations for which data are given in this report are shown in figures 5 and 8. Data Collection and Computation The data obtained at a complete-record gaging station on a stream or canal consists of a continuous record of stage, individual measurements of discharge throughout a range of stages, and notations regarding factors that may affect the relationships between stage and discharge. These data, together with supplemental information, such as weather records, are used to compute daily discharges. The data obtained at a complete-record gaging station on a lake or reservoir consist of a record of stage and of notations regarding factors that may affect the relationship between stage and lake content. These data are used with stage-area and stage-capacity curves or tables to compute water-surface areas and lake storage. 19 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 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. 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 Tech­ niques of Water-Resources Investigations, Book 3, Chapter A6. In computing discharge records, results of individual measurements are plotted against the corresponding stages, and stage-discharge relation curves are then constructed. From these curves, rating tables indicating the approx­ imate discharge for any stage within the range of the measurements are pre­ pared. If it is necessary to define extremes of discharge outside the range of the current-meter measurements, the curves are extended using: (1) loga­ rithmic plotting; (2) velocity-area studies; (3) results of indirect measure­ ments of peak discharge, such as slope-area or contracted-opening measure­ ments, 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 dis­ charge is determined by the shifting-control method, in which correction factors based on the individual discharge measurements and notes of the personnel making the measurements are applied to the gage heights before the discharges are determined from the curves or tables. This shifting-control method also is used if the stage-discharge relation is changed temporarily because of aquatic growth or debris on the control. At some stream-gaging stations the stage-discharge relation is affected by the backwater from reservoirs, tributary streams, or other sources. This necessitates the use of the slope method in which the slope or fall in a reach of the stream is a factor in computing discharge. The slope or fall is obtained by means of an auxiliary gage set at some distance from the base gage. At some stations the stage-discharge relation is affected by changing stage; at these stations the rate of change in stage is used as a factor in computing discharge. In computing records of lake or reservoir contents, it is necessary to have available from surveys, curves or tables defining the relationship of stage and contents. The application of stage to the stage-content curves or tables gives the contents from which daily, monthly or yearly changes then are determined. If the stage-content relationship changes because of deposition of sediment in a lake or reservoir, periodic surveys may be necessary to redefine it. Even when this is done, as time between the last survey increases, the contents computed may increase in error. Discharges over lake or reservoir spillways are computed from stage-discharge relationships much as other stream discharges are computed. 20 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 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 follow­ ing record, discharge measurements, weather records, and comparison with other station records from the same or nearby basins. Likewise, daily contents may be estimated from operator's logs, previous or following record, inflow- outflow studies, and other information. Information explaining how estimated daily-discharge values are identified in station records is included in the next two sections, "Data Presentation" (REMARKS paragraph) and "Identifying Estimated Daily Discharge." Data Presentation The records published for each gaging station consist of two parts, the manuscript or station description and the data table for the current water year. The manuscript provides, under various headings, descriptive informa­ tion, such as station location; period of record; average discharge; histori­ cal extremes; record accuracy; and other remarks pertinent to station opera­ tion and regulation. The following information, as appropriate, is provided with each continuous record of discharge or lake content. Comments to follow clarify information presented under the various headings of the station description. LOCATION.--Information on locations is obtained from the most accurate maps available. The location of the gage with respect to the cultural and physical features in the vicinity and with respect to the reference place mentioned in the station name is given. DRAINAGE AREA.--Drainage areas are measured using the most accurate maps available. Drainage areas are updated as better maps become available. PERIOD OF RECORD.--This indicates the period for which there are pub­ lished records for the station or for an equivalent station. An equivalent station is one that was in operation at a time that the present station was not, and whose location was such that records from it can reasonable be considered equivalent with records from the present station. REVISED RECORDS.--Published records, because of new information, occa­ sionally 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. 21 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 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 sec­ tion, "Identifying Estimated Daily Discharge.") If a remarks statement is used to identify estimated record, the paragraph will begin with this informa­ tion 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 spill­ way, and purpose and use of the reservoir. COOPERATION.--Records provided by a cooperating organization or obtained for the Geological Survey by a cooperating organization are identified here. AVERAGE DISCHARGE.--The discharge value given is the arithmetic mean of the water-year mean discharges. It is computed only for stations having at least 5 water years of complete record, and only water years of complete record are included in the computation. It is not computed for stations where diversions, storage, or other water-use practices cause the value to be meaningless. If water developments significantly altering flow at a station are put into use after the station has been in operation for a period of years, a new average is computed as soon as 5 water years of record have accumulated following the development. The median of yearly mean discharges also is given under this heading for stations having 10 or more water years of record, if the median differs from the average given by more than 10 percent. EXTREMES FOR PERIOD OF RECORD.--Extremes may include maximum and minimum stages and maximum and minimum discharges or content. Unless otherwise qualified, the maximum discharge or content is the instantaneous maximum corresponding to the highest stage that occurred. The highest stage may have been obtained from a graphic or digital recorder, a crest-stage gage, or by direct observation of a nonrecording gage. If the maximum stage did not occur on the same day as the maximum discharge or content, it is given separately. Similarly, the minimum is the instantaneous minimum discharge, unless other­ wise qualified, and was determined and is reported in the same manner as the maximum. EXTREMES OUTSIDE PERIOD OF RECORD.--Included here is information concern­ ing 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. 22 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 EXTREMES FOR CURRENT YEAR.--Extremes given here are similar to those for the period of record, except the peak discharge listing may include secondary peaks. For stations meeting certain criteria, all peak discharges and stages occurring during the water year and greater than a selected base discharge are presented under this heading. The peaks greater than the base discharge, excluding the highest one, are referred to as secondary peaks. Peak dis­ charges are not published for canals, ditches, drains, or streams for which the peaks are subject to substantial control by man. The time of occurrence for peaks is expressed in 24-hour local standard time. For example, 12:30 a.m. is 0030, and 1:30 p.m. is 1330. The minimum for the current water year appears below the table of peak data. REVISIONS.--If a critical error in published records is discovered, a revision is included in the first report published following discovery of the error. Although rare, occasionally the records of a discontinued gaging station may need revision. Because, for these stations, there would be no current or, possibly, future station manuscript published to document the revision in a "Revised Records" entry, users of data for these stations who obtained the record from previously published data reports may wish to contact the District office to determine if the published records were ever revised after the station was discontinued. Of course, if the data were obtained by computer retrieval, the data would be current and there would be no need to check because any published revision of data is always accompanied by revision of the corresponding data in computer storage. Manuscript information for lake or reservoir stations differs from that for stream stations in the nature of the "Remarks" and in the inclusion of a skeleton stage-capacity table when daily contents are given. The daily table for stream-gaging stations gives mean discharge for each day and is followed by monthly and yearly summaries. In the monthly summary below the daily table, the line headed "TOTAL" gives the sum of the daily figures. The line headed "MEAN" gives the average flow in cubic feet per second during the month. The lines headed "MAX" and "MIN" give the maximum and minimum daily discharges, respectively, for the month. Discharge for the month also is usually expressed in cubic feet per second per square mile (line headed "CFSM"), or in inches (line headed "IN."), or in acre-feet (line headed "AC-FT"). Figures for cubic feet per second per square mile and runoff in inches are omitted if there is extensive regulations or diversion or if the drainage area includes large noncontributing areas. In the yearly summary below the monthly summary, the figures shown are the appropriate discharges for the calendar and water years. Data collected at partial-record stations follow the information for continuous-record sites. Data for partial-record discharge stations are presented in two tables. The first is a table of annual maximum stage and discharge at crest-stage stations, and the second is a table of discharge measurements at low-flow partial-record stations. 23 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 Identifying Estimated Daily Discharge Estimated daily-discharge values published in the water-discharge tables of annual State data reports are identified either by flagging individual daily values with the letter symbol "e" and printing a table footnote, "e Estimated," or by listing the dates of the estimated record in the REMARKS paragraph of the station description. Accuracy of the Records The accuracy of streamflow records depends primarily on: (1) The stabil­ ity of the stage-discharge relation or, if the control is unstable, the frequency of discharge measurements; and (2) the accuracy of measurements of stage, measurements of discharge, and interpretation of records. The accuracy attributed to the records is indicated under "REMARKS." "Excellent" means that about 95 percent of the daily discharges are within 5 percent of the true; "good," within 10 percent; and "fair," within 15 percent. Records that do not meet the criteria mentioned, are rated "poor." Different accuracies may be attributed to different parts of a given record. Daily mean discharges in this report are given to the nearest hundredth of a cubic foot per second for values less than 1 ft3/s; to the nearest tenth between 1.0 and 10 ft3/s; to whole numbers between 10 and 1,000 ft3/s; and to 3 significant figures for more than 1,000 ft3/s. The number of significant figures used is based solely on the magnitude of the discharge value. The same rounding rules apply to discharges listed for partial-record stations and miscellaneous sites. Information used in the preparation of the records in this publication, such as discharge-measurement notes, gage-height records, temperature measure­ ments, 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. 24 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 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 collec­ ted 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 conduct­ ance, 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 sepa­ rate 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, care­ fully 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. 25 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 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 repre­ sentative sample needed for an accurate mean concentration and for use in calculating load. All samples obtained for the National Stream Quality Accounting 1;etwork (see definitions) are obtained from at least several verticals. Whether samples are obtained from the centroid of flow or from several verticals, depends on flow conditions and other factors which must be evaluated by the collector. Chemical-quality data published in this report are considered to be the most representative values available for the stations listed. The values reported represent water-quality conditions at the time of sampling as much as possible, consistent with available sampling techniques and methods of analy­ sis. In the rare case where an apparent inconsistency exists between a reported pH value and the relative abundance of carbon dioxide species (carbon­ ate 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 tempera­ tures 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. 26 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 Sediment Suspended-sediment concentrations are determined from samples collected by using depth-integrating samplers. Samples usually are obtained at several verticals in the cross section, or a single sample may be obtained at a fixed point and a coefficient applied to determine the mean concentration in the cross sections. During periods of rapidly changing flow or rapidly changing concentra­ tion, samples may have been collected more frequently (twice daily or, in some instances, hourly). The published sediment discharges for days of rapidly changing flow or concentration were computed by the subdivided-day method (time-discharge weighted average). Therefore, for those days when the pub­ lished 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 concentra­ tions observed immediately before and after the periods, and suspended- sediment loads for other periods of similar discharge. At other stations, suspended-sediment samples were collected periodically at many verticals in the stream cross section. Although data collected periodically may represent conditions only at the time of observations, such data are useful in establishing seasonal relations between quality and stream- flow and in predicting long-term sediment-discharge characteristics of the stream. In addition to the records of suspended-sediment discharge, records of the periodic measurements of the particle-size distribution of the suspended sediment and bed material are included for some stations. Laboratory Measurements Sediment samples, samples for biochemical-oxygen demand (BOD), samples for indicator bacteria, and daily samples for specific conductance are ana­ lyzed locally. All other samples are analyzed in the Geological Survey laboratories in Denver, Co. or Ocala, Fla. Methods used in analyzing sediment samples and computing sediment records are given in TWRI, Book 5, Chap. Cl. Methods used by the Geological Survey laboratories are given in TWRI, Book 1, Chap. D2; Book 3, Chap. C2; Book 5, Chap. Al, A3, and A4. Data Presentation For continuing-record stations, information pertinent to the history of station operation is provided in descriptive headings preceding the tabular data. These descriptive headings give details regarding location, drainage area, period of record, type of data available, instrumentation, general remarks, cooperation, and extremes for parameters currently measured daily. Tables of chemical, physical, biological, radiochemical data, and so forth, obtained at a frequency less than daily are presented first, and tables of "daily values" of specific conductance, pH, water temperature, dissolved oxygen, and suspended sediment then follow in sequence, when these parameters are studied. 27 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 In the descriptive headings, if the location is identical to that of the discharge gaging station, neither the LOCATION nor the DRAINAGE AREA state­ ments 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 pub­ lished water-quality records for the station. The periods are shown separate­ ly 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 subse­ quently 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 miscel­ laneous 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, 1986 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) 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 observa­ tion 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. 29 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 Water-level records are obtained from direct measurements with a steel tape or from the graph or punched tape of a water-stage recorder. The water- level measurements in this report are given in feet with reference to land- surface datum (lsd). Land-surface datum is a datum plane that is approxi­ mately 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 descrip­ tion. Water levels in wells equipped with recording gages are reported for every day ad,..1 a., an instantaneous observation at noon. Water levels are reported to as many significant figures as can be justified by the local conditions. For example, in a measurement of a depth to water of several hundred feet, the error of determining the absolute value of the total depth to water may be a few tenths of a foot, whereas the error in determining the net change of water level between successive measurements may be only a hundredth of a few hundredths of a foot. For lesser depths to water, the accuracy is greater. Accordingly, most measurements reported to a hundredth of a. foot, but some are given to a tenth of a foot or a larger unit. Data Presentation Each well record consists of two parts, the station description and the data table of water levels observed during the water year. The description of the well is presented first through use of descriptive headings preceding the tabular data. The comments to follow clarify information presented under the various headings. LOCATION.--This paragraph follows the well-identification number and reports the latitude and longitude (given in degrees, minutes, and seconds); a landline location designation; the hydrologic-unit number; the distance and direction from a geographic point of reference; and the owner's name. AQUIFER.--This entry designates by name (if a name exists) and geologic age the aquifer(s) open to the well. WELL CHARACTERISTICS.--This entry describes the well in terms of depth, diameter, casing depth and/or screened interval, method of construction, use, and additional information such as casing breaks, collapsed screen, and other changes since construction. DATUM.--This entry describes both the measuring point and the land- surface elevation at the well. The measuring point is described physically (such as top of collar, notch in top of casing, plug in pump base and so on), and in relation to land surface (such as 1.3 ft above land-surface datum). The elevation of the land-surface datum is described in feet above mean sea level datum, if available. It is reported with precision depending on the method of determina­ tion. 30 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 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. Geologi­ cal 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 low­ est 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 instanteous water-level observation at noon. The highest and lowest water levels of the water year are shown on a line below the table. Because all values are not published for wells with recorders, the extremes may be values that are not listed in the table. Missing records are indicated by dashes in place of the water level. Records of Ground-Water Quality Records of ground-water quality in this type of report differ from other types of records in that for most sampling sites they consist of only one set of measurements for the water year. The quality of ground water ordinarily changes only slowly; therefore, for most general purposes one annual sampling, or only a few samples taken at infrequent intervals during the year, is sufficient. Frequent measurement of the same constituents is not necessary unless one is concerned with a particular problem, such as monitoring for trends in nitrate concentration. In the special cases where the quality of ground water may change more rapidly, more frequent measurements are made to identify the nature of the changes. Data Collection and Computation The records of ground-water quality in this report were obtained mostly as a part of special studies in specific areas. Consequently, a number of chemical analyses are presented for some counties but none are presented for others. As a result, the records for this year, by themselves, do not provide a balanced view of ground-water quality Statewide. Such a view can be attained only by considering records for this year in context with similar records obtained for these and other counties in earlier years. 31 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 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 analy­ sis. All samples are obtained by trained personnel. The wells sampled are pumped long enough to assure that the water collected comes directly from the aquifer and has not stood for a long time in the well casing where it would have been exposed to the atmosphere and to the material, possibly metal, comprising the casings. Data Presentation The records of ground-water quality, when available, are published in a section titled QUALITY OF GROUND WATER immediately following the ground-water level records, Data for quality of ground water are listed alphabetically by County, and are identified by well number. The prime identification number for wells sampled is the 15-digit number derived from the latitude-longitude locations. No descriptive statements are given for ground-water-quality records; however, the well number, depth of well, date of sampling, and other pertinent data are given in the table containing the chemical analyses of the ground water. The REMARK codes listed for surface-water-quality records are also applicable to ground-water-quality records. ACCESS TO WATSTORE DATA The National WATer Data STOrage and REtrieval System (WATSTORE) was established for handling water data collected through the activities of the U.S. Geological Survey and to provide for more effective and efficient means of releasing the data to the public. The system is operated and maintained on the central computer facilities of the Survey at its National Center in Reston, Virginia. WATSTORE can provide a variety of useful products ranging from simple data tables to complex statistical analyses. A minimal fee, plus the actual computer cost incurred in producing a desired product, is charged to the requester. Information about the availability of specific types of data, the acquisition of data or products, and user charges can be obtained locally from each of the Water Resources Division's District offices (see address given on the back of the title page). General inquiries about WATSTORE may be directed to: Chief Hydrologist U.S. Geological Survey 437 National Center Reston, Virginia 22092 32 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 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 (nutri­ ent medium for bacterial growth). Their concentrations are expressed as number of colonies per 100 mL of sample. 33 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 Fecal coliform bacteria are bacteria that are present in the intestines or feces of warm-blooded animals. They are often used as in­ dicators 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 colo­ nies per 100 mL of sample. Feal 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 lab­ oratory 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 ex- pressed 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, ex­ pressed 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 periphy­ ton 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 differ­ ence 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). 34 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 Chemical oxygen demand (COD) is a measure of the chemically oxidizable material in the water, and furnishes an approximation of the amount of organic and reducing material present. The determined value may correlate with natural water color or with carbonaceous organic pollution from sewage or industrial wastes. Clorophyll refers to the green pigments of plants. Chlorophyll a and b are the two most common green pigments in plants. Color unit is produced by one milligram per liter of platinum in the form of the chloroplatinate ion. Color is expressed in units of the platinum- cobalt scale. Contents is the volume of water in a reservoir or lake. Unless otherwise indicated, volume is computed on the basis of a level pool and does not include bank storage. Control designates a feature downstream from the gage that determines the stage-discharge relation at the gage. This feature may be a natural constric­ tion of the channel, an artificial structure, or a uniform cross section over a long reach of the channel. Control structure as used in this report is a structure on a stream or canal that is used to regulate the flow or stage of the stream or to prevent the intrusion of salt water. Crest-stage station is a special form of partial-record station that records the highest stage of the stream that occurred between periodic visits to the station. A stage-discharge relation for each gage may be developed from discharge measurements made by indirect methods or by current meter. Cubic foot per second (cfs) is the rate of discharge representing a volume of 1 cubic foot passing a given point during 1 second and is equivalent to 7.48 gallons per second or 448.8 gallons per minute or 0.02832 cubic meters per second. Cubic foot per second-day (cfs-day) is the volume of water represented by a flow of 1 cubic foot per second for 24 hours. It is equivalent to 86,400 cubic feet, approximately 1.9835 acre-feet, about 646,000 gallons, or 2,445 cubic meters. Cubic feet per second per square mile (CFSM) is the average number of cubic feet of water flowing per second from each square mile of area drained, assuming that the runoff is distributed uniformly in time and area. 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. 35 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 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 n. n. 1 1 d = - E n--- log2 1-1- 1=1 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. 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. 36 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 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 hydrol­ ogy, including water quality, and related factors in representative un­ developed watersheds nationwide, and to provide analyses on a continuing basis to compare and contrast conditions observed in basins more obviously affected by the activities of man. Hydrologic unit is a geographic area representing part or all of a surface drainage basin or distinct hydrologic feature as delineated by the Office of Water Data Coordination on the State Hydrologic Unit Maps; each hydrologic unit is identified by an eight-digit number. Land-surface datum (lsd) is a datum plane that is approximately at land surface at each ground-water observation well. Measuring point (MP) is an arbitrary permanent reference point from which the distance to the water surface in a well is measured to obtain the water level. Metamorphic stage refers to the stage of development that an organism exhibits during its transformation from an immature form to an adult form. This developmental process exists for most insects, and the degree of differ­ ence 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 concentra­ tion of chemical constituents in solution. Milligrams per liter represent the mass of solute per unit volume (liter) of water. Concentration of suspended sediment also is expressed in mg/L, and is based on the mass of sediment per liter of water-sediment mixture. Conversion of chemical concentrations in Mg/L to milliequivalents per liter can be done by using the factors in table 5. 37 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 TABLE 5.--Factors for conversion of chemical constituents in milligrams per liter to milliequivalents per liter. Ion' Multiply by Ion Multiply by Aluminum (A1+3)* 0.11119 Iodide (I-1) 0.00788 Ammonia as NH4+1 .05544 Iron (Fe+3) .05372 Barium (Ba+2) .01456 Lead (Pb+2) .00965 Bicarbonate (HCO3-1).... .01639 Lithium (Li+1) .14411 Bromide (Br-1) .01251 Magnesium (Mg+2).... .08226 Calcium (Ca+2) .04990 Manganese (Mn+2)*... .03640 Carbonate (CO3-2) .03333 Nickel (Ni+2) .03406 Chloride (C1-1) .02821 Nitrate (NO3-1) .01613 Chromium (Cr+6)* .11539 Nitrite (NO2-1) .02174 Cobalt (Co+2)* .03394 Phosphate (PO4-3)... .03159 Copper (Cu+2)* .03148 Potassium (K+1) .02557 Cyanide (CN-1) .03844 Sodium (NA+1) .04350 Fluoride (F-1) .05264 Strontium (Sr+2).... .02283 Hydrogen (H+1) .99209 Sulfate (SO4-2) .02082 Hydroxide (OH-1) .05880 Zinc (Zn+2)* .03060 *Constituent reported in micrograms per liter; multiply by factor and divide results by 1,000. National Stream Quality Accounting Network (NASQAN) is a nationwide data-collection network designed by the U.S. Geological Survey to meet many of the information needs of government agencies and other groups involved in natural or regional water-quality planning and management. The 500 or so sites in NASQAN are generally located at the downstream ends of hydrologic accounting units designated by the U.S. Geological Survey office of Water Data Coordination in consultation with the Water Resources Council. The objectives of NASQAN are (1) to obtain information on the quality and quantity of water moving within and from the United States through a systematic and uniform process of data collection, summarization, analysis, and reporting such that the data may be used for, (2) description of the areal variability of water quality in the Nation's rivers through analysis of description of the areal variability of water quality in the Nation's rivers through analysis of data from this and other programs, (3) detection of changes or trends with time in the pattern of occurrence of water-quality characteristics, and (4) providing a nationally consistent data base useful for water-quality assessment and hydrologic research. 38 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 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 atmos­ pheric deposition, which includes snow, rain, dust particles, aerosols, and gases. The core from which the NTN was built was the already-existing deposi­ tion-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 constitu­ ent. The codes used in WATSTORE are the same as those used in the U.S. Environmental Protection Agency data system, STORET. The Environmental Protection Agency assigns and approves all requests for new codes. Partial-record station is a particular site where limited streamflow and/or water-quality data are collected systematically over a period of years for use in hydrologic analyses. Particle-size is the diameter, in millimeters (mm), of a particle deter­ mined 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 recommenda­ tions made by the American Geophysical Union Subcommittee on Sediment Termi­ nology. 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. 39 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 Percent composition is a unit for expressing the ratio of a particular part of a sample or population to the total sample or population, in terms of types, numbers, mass or volume. Periphyton is the assemblage of microorganisms attached to and living upon submerged solid surfaces. While primarily consisting of algae, they also include bacteria, fungi, protozoa, rotifers, and other small organisms. Pesticides are chemical compounds used to control undesirable organisms. Major categories of pesticides include insecticides, miticides, fungicides, herbicides, and rodenticides. Picocurie (PC, pCi) is one trillionth (1 X 10-1. 2) of the amount of ratioactivity represented by a curie (Ci). A curie is the amount of radio­ activity 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. Phyto­ plankton growth is dependent upon solar radiation and nutrient substan­ ces. 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 sili­ ceous 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 ca­ pable of extensive movements within the water column and are often large enough to be seen with the unaided eye. Zooplankton are secondary consu­ mers 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. 40 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 Primary productivity is a measure of the rate at which new organic matter is formed and accumulated through photosynthetic and chemosynthe­ tic 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 2 C/(m .time] for periphyton and macrophytes and [mg C/(m .time)] for phytoplankton are units for expressing primary productivity. They define the amount of carbon dioxide consumed as measured by radio- active carbon (carbon 14). The carbon 14 method is of greater sensitivity than the oxygen light and dark bottle method, and i^ 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 ime [mg0 / 2 (m .time)] for periphyton and macrophytes and [mg0 /(m .time)] for phytoplankton are the units for expressing primary productivity. They define production and respiration rates as estimated from changes in the measured dissolved-oxygen concentration. The oxygen light and dark bottle method is preferred if the rate of primary production is sufficient for accurate measurements to be made within 24 hours. Unit time may be either the hour or day, depending on the incubation period. Polychlorinated biphenyls (PCBs) are industrial chemicals that are mix­ tures of chlorinated biphenyl compounds having various percentages of chlo­ rine. 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. 41 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 Sediment is solid material that originates mostly from disintegrated rocks and is transported by, suspended in, or deposited from water; it in­ cludes 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 main­ tained in suspension by the upward components of turbulent currents or that exists in suspension as a colloid. Suspended-sediment concentration is the velocity-weighted concentra­ tion of suspended sediment in the sampled zone (from the water surface to a point approximately 0.3 ft above the bed) expressed as milligrams of dry sediment per liter of water-sediment mixture (mg/L). Mean concentration is the time-weighted concentration of suspended sediment passing a stream section during a 24-hour day. Suspended-sediment discharge (tons/day) is the rate at which dry mass of sediment passes a section of a stream or is the quantity of sediment, as measured by dry mass or volume, that passes a section in a given time. It is calculated in units of tons per day as follows: concentrations (mg/L) x discharge ft /s) x 0.0027. Suspended-sediment load is a general term that refers to material in suspension. It is not synonymous with either discharge or concentration. Total sediment discharge (tons/day) is the sum of the suspended- sediment discharge and the bed-load discharge. It is the total quantity of sediment, as measured by dry mass or volume, that passes a section during a given time. Total-sediment load or total load is a term which refers to the total sediment (bed load plus suspended-sediment load) that is in trans­ port. It is not synonymous with total-sediment discharge. 42 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 Sodium-adsorption-ratio (SAR) is the expression of relative activity of sodium ions in exchange reactions within soil and is an index of sodium or alkali hazard to the soil. Waters range in respect to sodium hazard from those which can be used for irrigation on almost all soils to those which are generally unsatisfactory for irrigation. Solute is any substance that is dissolved in water. Specific conductance is a measure of the ability of a water to conduct an electric current. It is expressed in microsiemens per centimeter at 25°C. Specific conductance is related to the type and concentration of ions in solution and can be used for approximating the dissolved-solids content of the water. Commonly, the concentration of dissolved solids (in milligrams per liter) is about 65 percent of the specific conductance (in micromhos). This relation is not constant from stream to stream, and it may vary in the same source with changes in the composition of the water. Stage-discharge relation is the relation between gage height (stage) and volume of water per unit of time, flowing in a channel. Streamflow is the discharge that occurs in a natural channel. Although the term "discharge" can be applied to the flow of a canal, the word "streamflow" uniquely describes the discharge in a surface stream course. The term "streamflow" is more general than "runoff" as streamflow may be applied to discharge whether or not it is affected by diversion or regulation. Substrate is the physical surface upon which an organism lives. Natural substrate refers to any naturally occurring emersed or submersed solid surface, such as a rock or tree, upon which an organism lives. Artificial substrate is a device which is purposely placed in a stream or lake for colonization of organisms. The artificial substrate simplifies the community structure by standardizing the substrate from which each sample is taken. Examples of artificial substrates are basket samplers (made of wire cages filled with clean streamside rocks) and multiplate samplers (made of hardboard) for benthic organism collection, and plexiglass strips for periphyton. Surface area of a lake is that area outlined on the latest U.S.G.S. topographic map as the boundary of the lake and measured by a planimeter in acres. In localities not covered by topographic maps, the areas are computed from the best maps available at the time planimetered. All areas shown are those for the stage when the planimetered map was made. Surficial bed material is that part (0.1 to 0.2 ft) of the bed material that is sampled using U.S. Series Bed-Material Samplers. Suspended (as used in tables of chemical analyses) refers to the amount (concentration) of the total concentration in a water-sediment mixture. It is associated with the material retained on a 0.45-micrometer filter. 43 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 Suspended, recoverable is the amount of a given constituent that is in solution after the part of a representative water-suspended sediment sample that is retained on a 0.45 um membrane filter has been digested by a method (usually using a dilute acid solution) that results in dissolution of only readily soluble substances. Complete dissolution of all the particulate matter is not achieved by the digestion treatment and thus the determination represents something less than the "total" amount (that is, less than 95 percent) of the constituent present in the sample. To achieve comparability of analytical data, equivalent digestion procedures are required of all laboratories performing such analyses because different digestion procedures are likely to produce different analytical results. Determinations of "suspended, recoverable" constituents are made either by analyzing portions of the material collected on the filter or, more commonly, by difference, based on determinations of (1) dissolved and (2) total recoverable concentrations of the constituent. Suspended, total is the total amount of a given constituent in the 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 concen­ trations of the constituent. Taxonomy is the division of biology concerned with the classification and naming of organisms. The classification of organisms is based upon a hierarchial scheme beginning with Kingdom and ending with Species at the base. The higher the classification level, the fewer features the organisms have in common. For example, the taxonomy of a particular mayfly, Hexagenia limbata, is the following: Kingdom Phylum Class Animal Arthopoda Insecta Order Family Genus Species Ephemeroptera Ephemeridae Hexagenia 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. 44 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 Tons per acre-foot indicates the dry mass of dissolved solids in 1 acre-foot of water. It is computed by multiplying the concentration of the constituent, in milligrams per liter by 0.00136. Tons per day (T/DAY) is the quantity of a substance in solution or suspension that passes a stream section during a 24-hour period._ Total is the total amount of a given constituent in a representative water-suspended sediment sample, regardless of the constituent's physical or chemical form. This term is used only when the analytical procedure assures measurement of at least 95 percent of the constituent present in both the dissolved and suspended phases of the sample. A knowledge of the expected form of the constituent in the sample, as well as the analytical methodology used, is required to judge when the results should be reported as "total." (Note that the word "total" does double duty here, indicating both that the sample consists of a water-suspended sediment mixture and that the analytical method determined all of the constituent in the sample.) Total discharge is the total quantity of any individual constituent, as measured by dry mass or volume, that passes through a stream cross-section per unit of time. This term needs to be qualified, such as "total sediment discharge," "total chloride discharge," and so on. Total, recoverable is the amount of a given constituent that is in solution after a representative water-suspended sediment sample has been digested by a method (usually using a dilute acid solution) that results in dissolution of only readily soluble substances. Complete dissolution of all particulate matter is not achieved by the digestion treatment, and thus the determination represents something less than the "total" amount (that is, less than 95 percent) of the constituent present in the dissolved and suspended phases of the sample. To achieve comparability of analytical data, equivalent digestion procedures are required of all laboratories performing such analyses, because different digestion procedures are likely to produce different analytical results. Tritium Network is a network of stations which has been established to provide baseline information on the occurrence of tritium in the Nation's surface waters. In addition to the surface-water stations in the network, tritium data are also obtained at a number of 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. 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). 45 WATER RESOURCES FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1986 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. 46 PUBLICATIONS ON TECHNIQUES OF WATER-RESOURCES INVESTIGATIONS The U.S. Geological Survey publishes a series of manuals describing procedures for planning and conducting specialized work in water-resources investigations. The material is grouped under major subject headings called books and is further divided into sections and chapters. For example, Section A of Book 3 (Applications of Hydraulics) pertains to surface water. The chapter, the unit of publication, is limited to a narrow field of subject matter. This format permits flexibility in revision and publication as the need arises. The reports listed below are for sale by the U.S. Geological Survey, Books and Open- File Reports Section, Federal Center, Box 25425, Denver, Colorado 80225 (authorized agent of the Superintendent of Documents, Government Printing Office). Prepayment is required. Remittance should be sent by check or money order payable to the U.S. Geological Survey. Prices are not included because they are subject to change. Current prices can be obtained by writing to the above address. When ordering or inquiring about prices for any of these publications, please give the title, book number, chapter number, and "U.S. Geological Survey Techniques of Water-Resources Investigations." 1-D1. Water temperature--influential factors, field measurement, and data presentation, by H. H. Stevens, Jr., J. F. Ficke, and G. F. Smoot: USGS--TWRI Book 1, Chapter Dl. 1975. 65 pages. 1-D2. Guidelines for collection and field analysis of ground-water samples for selected unstable constituents, by W. W. Wood: USGS--TWRI Book 1, Chapter D2. 1976. 24 pages. 2-D1. Application of surface geophysics to ground-water investigations, by A. A. R. Zohdy, G. P. Eaton, and D. R. Mabey: USGS--TWRI Book 2, Chapter Dl. 1974. 116 pages. 2-El. Application of borehole geophysics to water-resourcee investigations, by W. S. Keys and L. M. MacCary: USGS--TWRI Book 2, Chapter El. 1971. 126 pages. 3-Al. general field and office procedures for indirect discharge measurements, by M. A. Benson and Tate Dalrymple: USGS--TWRI Book 3, Chapter Al. 1967. 30 pages. 3-A2. Measurement of peak discharge by the slope-area method, by Tate Dalrymple and M. A. Benson: USGS--TWRI Book 3, Chapter A2. 1967. 12 pages. 3-A3. Measurement of peak discharge at culverts by indirect methods, by G. L. Bodhaine: USGS-- TWRI Book 3, Chapter A3. 1968. 60 pages. 3-A4. Measurement of peak discharge at width contractions by indirect methods, by H. F. Matthai: USGS--TWRI Book 3, Chapter A4. 1967. 44 Pages. 3-A5. Measurement of peak discharge at dams by indirect methods, by Harry Hulsing: USGS--TWRI Book 3, Chapter A5. 1967. 29 pages. 3-A6. General procedure for gaging streams, by R. W. Carter and Jacob Davidian: USGS--TWRI Book 3, Chapter A6. 1968. 13 pages. 3-A7. Stage measurements at gaging stations, by T. J. Buchanan and W. P. Somers: USGS--TWRI Book 3, Chapter A7. 1968. 28 pages. 3-A8. Discharge measurements at gaging stations, by T. J. Buchanan and W. P. Somers: USGS--TWRI Book 3, Chapter A8. 1969. 65 pages. 3-A9. Measurement of time of travel and dispersion in streams by dye tracing, by E. F. Hubbard, F. A. Kilpatrick, L. A. Martens, and J. F. Wilson, Jr.: USGS--TWRI Book 3, Chapter A9. 1982. 44 pages. 3-A10. Discharge ratings at gaging stations, by E. J. Kennedy: USGS--TWRI Book 3, Chapter A10. 1984. 59 pages. 3-All. Measurement of discharge by moving-boat method, by G. F. Smoot and C. E. Novak: USGS--TWRI Book 3, Chapter All. 1969. 22 pages. 3-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 Davidiai: USGS--TWRI Book 3, Chapter A15. 1984. 48 pages. 3-61. Aquifer-test design, observation, and data analysis, by R. W. Stallman: USGS--TWRI Book 3, Chapter Bl. 1971. 26 pages. 3-B2. Introduction to ground-water hydraulics, a programed text for self-instruction, by G. D. Bennett: USGS--TWRI Book 3, Chapter B2. 1976. 172 pages. 3-63. 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. PUBLICATIONS ON TECHNIQUES OF WATER-RESOURCES INVESTIGATIONS-Continued 3-Cl. Fluvial sediment concepts by H. P. Guy: USGS--TWRI Book 3, Chapter Cl. 1970. 55 pages. 3-C2. Field methods for measurement of fluvial sediment. by H. P. Guy and V. W. Norman: USGS-- TWRI Book 3, Chapter C2. 1970. 59 pages. 3-C3. Computation of fluvial-sediment discharge by George Porterfield: USGS--TWRI Book 3, Chapter C3. 1972. 66 pages. 4-Al. Some statistical tools in hydrology, by H. C. Riggs: USGS--TWRI Book 4, Chapter Al. 1968. 39 pages. 4-A2. Frequency curves by H. C. Riggs: USGS--TWRI Book 4, Chapter A2. 1968. 15 pages. 4-B1. Low-flow investigations, by H. C. Riggs: USGS--TWRI Book 4, Chapter Bl. 1972. 18 pages. 4-B2. Storage analyses for water supply, by H. C. Riggs and C. H. Hardison: USGS--TWRI Book 4, Chapter B2. 1973. 20 pages. 4-B3. Regional analyses of streamflow characteristics by H. C. Riggs: USGS--TWRI Book 4, Chapter B3. 1973. 15 pages. 441. Computation of rate and volume of stream depletion by wells by C. T. Jenkins: USGS--TWRI Book 4, Chapter 01. 1970. 17 pages. 5-Al. Methods for determination of inorganic substances in water and fluvial sediments by M. W. Skougstad and others, editors: USGS--TWRI Book 5, Chapter Al. 1979. 626 pages. 5-A2. Determination of minor elements in water by emission spectroscopy. by P. R. Barnett and E. C. Mallory, Jr.: USGS--TWRI Book 5, Chapter A2. 1971. 31 pages. 5-A3. Methods for analysis of organic substances in water. by D. F. Goerlitz and Eugene Brown: USGS--TWRI Book 5, Chapter A3. 1972. 40 pages. 5-A4. Methods for collection and analysis of aquatic biological and microbiological samples edited by P. E. Greeson, T. A. Ehlke, G. A. Irwin, B. W. Lium, and K. V. Slack: USGS--TWRI Book 5, Chapter A4. 1977. 332 pages. 5-A5. Methods for determination of radioactive substances in water and fluvial sediments. by L. L. Thatcher, V. J. Janzer, and K. W. Edwards: USGS--TWRI Book 5, Chapter A5. 1977. 95 pages. 5-A6. Quality assurance practices for the chemical and biological analyses of water and fluvial sedments, by L. C. Friedman and D. E. Erdmann: USGS--TWRI Book 5, Chapter A6. 1982. 181 pages. S-Cl. Laboratory theory and methods for sediment analysis. by H P. Guy: USGS--TWRI Book 5, Chapter Cl. 1969. 58 pages. 7-Cl. Finite difference model for aquifer simulation in two dimensions with results of numerical experiments, by P. C. Trescott, G. F. Pinder, and S. P. Larson: USGS--TWRI Book 7, Chapter Cl. 1976. 116 pages. 7-C2. Computer model of two-dimensional solute transport and dispersion in ground water, by L. F. Konikow and J. D. Bredehoeft: USGS--TWRI Book 7, Chapter C2. 1978. 90 pages. 7-C3. A model for simulation of flow in singular and interconnected channels by R. W. Schaffrannek, R. A. Baltzer, and D. E. Goldberg: USGS--TWRI Book 7, Chapter C3. 1981. 110 pages. 8-Al. Methods of measuring water levels in deep wells by M. S. Garber and F. C. Koopman: USGS-- TWRI Book 8, Chapter Al. 1968. 23 pages 8-A2. Installation and service manual for U.S. Geological Survey manometers by J. D. Craig: USGS--TWRI Book 8, Chapter A2. 1983. 57 pages. 8-B2. Calibration and maintenance of vertical-axis type current meters by G. F. Smoot and C. Novak: USGS--TWRI Book 8, Chapter B2. 1968. 15 pages. 47 Surface and Quality-of-Water Records for Puerto Rico ATLANTIC OCEAN ISABELA 0114 QUEBRADILLAS • 202 AGUADILLA • 165 0112 0110 010790 Drainage boundaries indeterminate in limestone terrane 010720 Limestone igneous sedimentary rocks 0106 ARE Rin Cuisbrinos basin Grande de Aiiascia basin EXPLANATION A 0106 SURFACE—WATER STATION AND NUMBER V 0105 QUALITY—OF—WATER STATION AND NUMBER 10720 QUALITY—OF—WATER PARTIAL RECORD V STATION AND NUMBER 0165 WELL AND WELL NUMBER \--Map area A 2 3 4 5 IILOM5TERS 5 MILES Figure 11.--Rio Guajataca basin. RIO GUAJATACA BASIN 50010500 RIO GUAJATACA AT TARES, 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 sq mi (8.18 sq km). PERIOD OF RECORD.--Water years 1958-71, 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- ,=ECAL, FECAL, FLOW, CON- PH TEMPER- . TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1985 31... 1445 15 260 7.60 23.0 9.0 <10 480 520 DEC 13... 0925 6.8 205 7.80 20.0 1.4 9.1 99 <10 K660 2300 FEB 1986 13... 0710 2.2 21B 7.85 19.0 2.6 6.4 72 12 K630 5900 MAY 02... 1115 15 258 7.75 23.0 21 7.9 94 18 5000 K9100 JUL 07... 1550 348 7.53 23.5 260 7.9 95 110 45000 71000 SEP 08... 1310 3.1 233 7.35 25.5 840 7.7 97 35 K1400 720 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- HARD- NONCARB CALCIUM SIUM, SODIUM, AD- SLUM, WATER SULFATE RIDE, NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS. SO4) AS CL) OCT 1985 31... 76 2 22 5.0 10 0.5 2.2 74 <0.5 8.1 9.7 DEC 13... -- 79 FEB 1986 13... 82 MAY 02... 91 10 29 4.6 8.6 0.4 2.6 81 <0.5 12 9.5 JUL 7... 52 SEP 8... 70 3 17 6.8 14 0.7 3.4 67 17 12 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE N024-NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) S102) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1985 31... <0.10 28 130 5.2 19 2.09 0.010 2.10 0.050 0.35 DEC 13... 3 1.79 0.010 1.80 0.020 0.28 FEB 1986 13... 7 <0.010 0.900 0.020 0.18 MAY 02... <0.10 21 140 5.6 22 1.88 0.020 1.90 0.110 0.39 JUL 7... 1.14 0.060 1.20 0.250 1.7 SEP 8... 0.30 22 130 1.1 1.29 0.010 1.30 0.290 0.11 K = non-ideal count 52 RIO GUAJATACA BASIN 50010500 RIO GUAJATACA AT LARES, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1985 31... 0.40 2.5 11 0.060 <1 <100 20 1 8 <10 DEC 13... 0.30 2.1 9.3 0.060 FEB 1986 13... 0.20 1.1 4.9 0.030 MAY 02... 0.50 2.4 11 0.060 1 <100 20 <1 8 10 JUL 7... 1.9 3.1 14 0.210 SEP 8... 0.40 1.7 7.5 0.220 -- MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1985 31... 650 3 50 <0.10 <1 <1 50 <0.010 2 0.06 DEC 13... FEB 1986 13... MAY 02... 1200 2 80 0.10 <1 <1 10 <0.010 <1 0.05 JUL 07... -- SEP 08... PESTICIDE ANALYSES CHLOR- DI- DI- PCB, ALDRIN, DANE, ODD, DDE, DDT, AZINON, ELDRIN DATE 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) JUL 1986 18... 1110 <0.1 <0.010 <0.1 <0.010 <0.010 <0.010 0.12 <0.010 HEPTA- METH- ENDO- HEPTA- CHLOR MALA- OXY- SULFAN. ENDRIN, ETHION, CHLOR, EPDXIDE LINDANE THION, CHLOR, DATE TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUL 1986 18... <0.010 <0.010 <0.01 <0.010 <0.010 <0.010 0.01 <0.01 NAPH- THA- METHYL METHYL LENES. PARA- TRI- PARA- POLY- PER- TOX- TOTAL THION, THION, MIREX, THION, CHLOR. THANE APHENE, TR1- DATE TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL THION (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/1)' (UG/L) (UG/L) JUL 1986 18... <0.01 <0.01 <0.01 <0.01 <0.10 <0.1 <1 <0.01 53 I I I 54 RIO GUAJATACA BASIN 50010600 RIO GUAJATACA ABOVE LAGO GUAJATACA, PR LOCATION.--Lat 18°19'57•. long 66°55'29•, Hydrologic Unit 21010002, 1.0 mi (1.6 km) off road 451, 3 mi (5 km) south of Lago Guajataca, 1.0 i (1.6 km) east of Eneas and 2.0 •i (3.2 km) west of Piletas. DRAINAGE AREA.--Indeterminate. WATER-DISCHARGE RECORDS PERIOD OF RECORD.--July 1984 to current year. GAGE.--Water-stage recorder. Elevation of gage is 565 ft (172 m), from topographic map. REMARKS.--Estimated daily discharges: Apr. 25 to May 6, May 13-20, May 26 to June 9, June 26-30, July 13, 14 and Aug. 3-5. Records fair except those for estimated daily discharges, which are poor. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 2,600 ft,/s (73.6 •'/s), May 18, 1985. gage height, 12.03 ft (3.667 m), from rating curve extended above 100 ft'/s (2.83 3/s) on the basis of step-backwater analysis; minimum discharge, 1.9 ft'is (0.054 •'/s), Feb. 11, 17, 1986. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,500 ft'is (42.5 3/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'is) (leis) (ft) (m) Date Time (W/s) (e/s) (ft) (m) Oct. 6 1800 1,540 43.6 10.08 3.072 Nov. 5 1700 1,790 50.7 10.60 3.231 Oct. 26 1730 2,400 68.0 11.69 3.563 May 13 0630 2,280 64.6 11.50 3.505 Oct. 27 1545 *2,550 72.2 *11.95 3.642 May 13 2100 2,420 66.5 11.72 3.572 Oct. 28 1630 1,620 45.9 10.24 3.121 June 10 1600 1,740 49.3 10.50 3.200 Nov. 3 1700 2,130 60.3 11.23 3.423 Sept. 3 1600 1,660 47.0 10.33 3.149 Minimum discharge, 1.9 ft'is (0.054 m'/s), Feb. 11, 17. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 114 43 17 7.0 3.7 3.0 11 101 39 12 38 13 2 55 36 17 6.8 3.7 2.7 9.2 120 35 12 74 195 3 26 338 16 8.7 20 78 42 165 32 13 47 226 4 17 219 15 6.9 35 45 52 82 30 11 23 70 5 14 311 15 6.0 6.8 15 80 203 29 10 20 26 6 228 207 15 5.7 3.6 12 31 521 27 13 19 18 7 688 98 14 5.7 3.1 8.9 24 277 60 35 17 13 8 158 62 13 5.7 2.6 7.9 43 156 54 15 84 11 9 75 48 14 10 2.3 6.8 83 136 27 12 118 9.4 10 52 42 13 11 2.4 5.5 63 240 204 10 77 8.4 11 55 35 13 6.2 2.2 9.2 27 139 79 18 56 7.8 12 113 32 12 5.9 3.0 9.5 19 139 46 12 30 8.1 13 61 30 13 5.8 3.3 6.1 15 650 36 10 28 7.2 14 37 33 11 5.5 3.3 5.4 12 190 28 52 24 7.1 15 31 139 11 5.0 2.9 5.4 11 100 43 48 19 6.6 16 26 152 11 5.0 2.5 6.9 10 80 28 25 18 6.5 17 21 165 10 4.9 3.3 224 101 62 22 23 19 8.2 18 20 88 9.5 4.5 3.4 95 82 52 53 19 18 9.1 19 17 54 9.5 4.2 17 25 42 45 34 12 14 6.1 20 16 45 9.2 3.9 49 15 68 40 23 77 13 5.9 21 15 48 9.0 3.8 19 11 118 34 27 33 12 6.4 22 14 36 8.6 4.2 5.9 8.9 157 26 22 16 12 10 23 62 32 8.7 3.4 4.2 7.7 165 35 19 14 9.7 7.5 24 48 28 7.8 3.2 3.9 7.3 172 42 17 16 8.9 5.9 25 44 26 7.7 4.0 3.8 7.4 83 43 16 66 8.5 15 26 320 23 7.4 3.3 3.4 7.0 57 170 18 200 13 10 27 461 22 7.4 4.4 4.2 15 49 100 14 85 16 5.0 28 266 20 7.8 3.7 3.2 18 36 68 13 38 25 22 29 102 19 7.4 6.2 --- 65 57 78 13 25 18 11 30 71 18 7.3 6.3 34 76 66 13 27 20 6.3 31 54 --- 6.9 6.5 15 --- 45 --- 51 15 --- TOTAL 3281 2449 344.2 173.4 220.7 782.6 1795.2 4205 1101 1010 914.1 761.5 MEAN 106 81.6 11.1 5.59 7.88 25.2 59.8 136 36.7 32.6 29.5 25.4 MAX 688 338 17 11 49 224 172 650 204 200 118 226 MIN 14 18 6.9 3.2 2.2 2.7 9.2 26 13 10 8.5 5.0 CFSM .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 IN. .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 AC-FT 6510 4860 683 344 438 1550 3560 8340 2180 2000 1810 1510 CAL YR 1985 TOTAL 13641.9 MEAN 37.4 MAX 792 MIN 3.2 CFSM .00 IN. .00 AC-FT 27060 WTR YR 1986 TOTAL 17037.7 MEAN 46.7 MAX 688 MIN 2.2 CFSM .00 IN. .00 AC-FT 33790 55 RIO GUAJATACA BASIN 50010600 RIO GUAJATACA ABOVE LAGO GUAJATACA, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS AUGUST 1984 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) NOV, 19 1306 54 366 24.0 JUL, 07 1045 13 287 24.0 DEC, 09 1444 14 305 22.5 AUG, 05 1255 19 370 24.5 JUN, 09 1048 31 254 22.5 SEP, 03 1213 32 310 23.0 56 RIO GUAJATACA BASIN 50011000 CANAL PRINCIPAL DE DIVERSIONES AT LAGO DE GUAJATACA, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°24'02", long 66°55'27", off Highway 476 at Lago Guajataca outlet, 3.0 mi (4.8 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 1985 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLT- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR 1NSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1985 04... 0800 50 309 7.40 25.5 6.0 1.2 15 10 350 K160 DEC 12... 1345 E55 389 7.40 24.5 1.2 1.6 19 <10 <1 K6 FEB 1986 12... 1322 65 302 7.65 24.5 1.0 3.0 37 13 K3 K5 MAY 02... 0740 55 429 7.50 24.5 10 1.3 19 K140 54 JUL 08... 0805 70 287 7.12 25.5 2.5 1.8 22 <10 K8 21 SEP 08... 1540 70 335 6.95 26.5 2.4 1.7 22 22 200 270 HARD- ALKA- NESS MAGNE- SODIUM ROTAS- LINITY FARO- NONCARB CALCIUM SLUM, SODIUM, AD- SLUM, WATER SULFATE NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) OCT 1985 04... 140 5 52 3.4 5.3 0.2 2.7 139 <0.5 9.4 DEC 12... 131 FEB 1986 12... 128 MAY 02... 140 4 50 3.6 5.3 0.2 1.8 136 <0.5 10 JUL 08... 130 SEP 08... 140 10 51 4.2 6.2 0.2 1.8 135 9.3 SOLIDS, SOLIDS, CHLO- FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- RIDE, RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, DIS- DIS- SOLVED TUENTS, SOLVED DEG. C, NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL DATE (MG/L (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L AS CL) AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) OCT 1985 04... 8.1 0.10 5.1 170 23 4 <0.010 <0.100 0.160 0.44 DEC 12... 2 <0.010 0.200 0.020 0.38 FEB 1986 12... 2 <0.010 0.100 0.030 0.37 MAY 02... 7.7 <0.10 6.6 170 25 1 <0.010 0.300 0.040 0.36 JUL 08... 5 <0.010 <0.100 0.080 0.42 SEP 08... 6.8 0.10 7.9 170 32 9 <0.010 0.100 0.180 0.42 K = non-ideal count E - estimate RIO GUAJATACA BASIN 50011000 CANAL PRINCIPAL DE DIVERSIONES AT LAGO DE GUAJATACA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1985 04... 0.60 0.020 2 <100 20 <1 7 <10 DEC 12... 0.40 0.60 2.7 0.010 FEB 1986 12... 0.40 0.50 2.2 <0.010 MAY 02... 0.40 0.70 3.1 0.030 1 <100 <10 1 5 10 JUL 08... 0.50 0.020 SEP 08... 0.60 0.70 3.1 0.030 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1985 04... 230 3 200 <0.10 1 <1 10 <0.010 2 0.04 DEC 12... FEB 1986 12... MAY 02... 110 1 70 0.20 <1 <1 20 <0.010 <1 0.05 JUL 08... SEP 08... 57 58 RIO GUAJATACA BASIN 50011200 RIO GUAJATACA BELOW LAGO GUAJATACA, PR LOCATION.--Lat 18'24'01', long 66'55'40", Hydrologic Unit 21010002, on left bank, 250 ft (76 m) downstream from bridge on Highway 476, 1,000 ft (305 m) downstream from outlet tunnel, and 5.2 mi (8.4 km) southeast of Quebradillas. DRAINAGE AREA.--Indeterminate. WATER-DISCHARGE RECORDS PERIOD OF RECORD.--August 1969 to December 1970, April 1984 to current year. GAGE.--Water-stage recorder. Elevation of gage is 535 ft (163 m), from topographic map. REMARKS.--No estimated daily discharges during water year. Records fair except those for June 4-30, Aug. 1 to Sept. 3 and Sept. 5-19, which are poor. Flow regulated by Lago Guajataca Dam. Low flows are from seepage through and under dam and nearby springs. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 1,350 ft 3 /$ (38.2 e/s), May 13, 1986, gage height, 11.97 ft (3.648 m), from rating curve extended above 400 ftVs (11.3 m 3 /s) on basis of step-backwater analysis; minimum discharge, 0.53 ft'is (0.015 m 3 /s), May 31, June 1, 1984. EXTREMES FOR CURRENT YEAR.--Maximum discharge, 1,350 ftqs (38.2 mVs), May 13, gage height, 11.97 ft (3.648 m); minimum discharge, 0.68 ft'/s (0.019 80/s), Jan. 27, Mar. 16. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 2 3 4 5 4.2 162 354 353 310 431 379 379 401 437 2.5 2.6 3.7 3.2 2.4 1.0 1.1 1.5 1.2 1.3 .79 .76 .90 1.3 .86 1.2 1.2 1.3 .95 .88 1.2 1.6 1.7 1.3 2.7 386 485 481 481 483 495 494 492 282 119 1.5 1.5 1.6 1.5 1.6 1.7 1.6 1.5 1.5 1.8 1.7 2.3 1.8 1.6 95 6 7 8 9 10 288 467 537 523 520 461 489 494 492 490 2.0 1.6 1.5 1.4 1.5 1.2 1.3 1.4 1.6 1.3 .90 .87 .86 .82 .83 .86 .85 .82 .78 .78 1.3 1.3 3.5 1.8 1.4 606 703 444 561 560 55 1.5 1.4 1.4 1.7 1.5 1.4 1.6 1.8 1.8 1 8 1 8 75 145 146 214 213 191 159 159 11 12 13 14 15 518 515 512 466 377 488 385 112 3 0 101 1.5 1.5 1.4 1.3 1.4 1.0 .98 .99 1.2 1.2 1.0 .97 .94 .88 .73 .79 .76 .71 .71 .71 1.3 1.3 1.3 1.3 1.4 583 540 835 1110 711 1.5 1.4 1.4 1.3 1.4 1.8 1.8 1.8 1.8 2.0 132 178 192 365 395 60 1.6 1.9 2.0 1.9 16 17 18 19 20 184 2.5 2.3 2.2 2.0 271 272 335 367 363 1.4 1.8 1.3 1.3 1.3 1.1 1.1 1.0 .95 .94 .75 .75 .78 .94 1.1 .71 .77 .98 1.0 1.0 1.5 1.6 1.7 1.9 2.4 590 521 500 505 503 1.4 1.5 1.4 1.4 1.4 1.9 1.9 1.8 1.8 1.8 341 340 240 194 104 1.9 1.7 1.6 1.6 1.6 21 22 23 24 25 2.0 2.2 2.4 1.8 59 396 172 3.2 2.0 2.1 1.5 1.4 1.3 1.3 1.3 .88 .88 .86 .85 .95 .94 .82 .78 .78 .83 .88 .82 .83 .87 1.3 151 349 368 396 457 502 500 498 495 494 1.3 1.4 1.3 1.3 1.3 1.8 2.0 2.2 2.2 2.0 1.8 2.9 2.6 2.2 2.2 1.7 1.9 2.2 2.0 1.9 26 27 28 29 30 31 155 306 455 455 454 454 2.4 2.3 2.3 2.3 2.6 --- 1.4 1.3 1.3 1.1 1.0 1.0 .89 .78 .77 .80 .84 .84 1.1 1.1 1.1 1.3 1.2 1.4 1.3 1.2 1.2 480 477 386 313 314 --- 496 495 496 495 495 496 1.3 1.3 1.2 1.3 1.4 --- 1.9 2.0 1.7 1,5 1.6 2.9 2.2 1.8 1.9 1.7 1.7 1.7 1.8 1.4 1.4 1.4 1.4 --- TOTAL MEAN MAX MIN CFSM IN. AC-FT 8445.6 272 537 1.8 .00 .00 16750 7737.2 258 494 2.0 .00 .00 15350 50.5 1.63 3.7 1.0 .00 .00 100 32.70 1.05 1.6 .77 .00 .00 65 25.18 .90 1.3 .73 .00 .00 50 30.06 .97 1.4 .71 .00 .00 60 3724.5 124 480 1.2 .00 .00 7390 17050 550 1110 386 .00 .00 33820 1970.2 65.7 495 1.2 .00 .00 3910 56.0 1.81 2.9 1.4 .00 .00 111 2881.4 92.9 395 1.5 .00 .00 5720 1131.3 37.7 214 1.4 .00 .00 2240 CAL YR 1985 WTR YR 1986 TOTAL TOTAL 20616.28 43134.64 MEAN MEAN 56.5 118 MAX MAX 537 1110 MIN MIN .79 .71 CFSM CFSM .00 .00 IN. IN. .00 .00 AC-FT AC-FT 40890 85560 59 RIO GUAJATACA BASIN 50011200 RIO GUAJATACA BELOW LAGO DE GUAJATACA, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS APRIL 1984 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA­ DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) NOV, 20 1428 326 287 24.5 JUL, 07 1303 1.4 344 27.0 MAY, 20 1339 411 275 24.0 AUG, 06 1219 1.7 352 27.0 JUN, 10 1105 1.6 410 26.0 SEP, 03 1428 1.8 380 26.5 I I I I I 60 RIO GUAJATACA BASIN 50011400 RIO GUAJATACA ABOVE MOUTH NEAR QUEBRADILLAS, PR LOCATION.--Lat 18'28'31'. long 66'57'46", Hydrologic Unit 21010002, on left bank at ford 1.7 mi (2.7 km) upstream fro bridge on Highway 2, 1.6 i (2.6 km) west of Quebradillas plaza. 2.1 mi (3.4 km) upstream from the Atlantic Ocean, and 6.6 mi (10.6 km) downstream from Lago Guajataca. DRAINAGE AREA.--Indeterminate. WATER-DISCHARGE RECORDS PERIOD OF RECORD.--February to May 1969 (monthly measurements only). July 1969 to December 1970, April 1984 to current year. GAGE.--Water-stage recorder. Elevation of gage is 0.0 ft (0.0 ), from topographic map. REMARKS.--Estimated daily discharges: Oct. 3-8, Dec. 4-7, 9-19, 24-31, Jan. 1, 6-9. 11-21, 27-31, Feb. 1, 15-18, 22-28, Mar. 1-6, 23-26, 28-31. Apr. 21, Nov. 20-22, May 14 to June 10 and Aug. 24 to Sept. 12. Records fair except those for estimated daily discharges, which are poor. Flow regulated by Lago Guajataca 6.6 mi (10.6 km). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 6,200 ft'/s (176 m'/s), May 13, 1986, estimated based on a mean daily discharge correlation with station 50011200, 6.5 miles upstream; minimum discharge, 6.2 ft'A (0.176 '/s). Sept. 4, 9-12, 1984. EXTREMES FOR CURRENT YEAR.--Maximum discharge, 6,200 ft'is (176 m 3/s), May 13, 1986; minimum discharge, 8.6 ft'is (0.24 '/s). Dec. 24, Jan. 2. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 2 3 4 5 55 187 820 820 720 845 370 391 663 885 12 12 11 12 12 9.5 8.8 8.8 9.0 9.2 9.3 9.0 9.2 10 11 11 11 16 12 12 15 14 14 16 20 548 1250 1190 1450 1320 1100 1100 1100 390 80 19 19 19 19 19 12 11 11 12 11 12 25 35 60 100 6 7 8 9 10 680 1100 1200 1390 1240 922 1150 1080 1020 962 12 11 9.3 10 11 10 9.5 9.5 18 9.9 9.7 9.6 9.6 9.7 9.7 12 11 11 11 12 18 16 27 41 21 1960 2650 1440 1390 1360 45 37 31 28 32 19 19 19 19 19 12 12 17 44 45 190 180 170 160 150 11 12 13 14 15 1190 1240 1220 1040 708 945 725 78 14 118 11 11 10 10 10 10 10 9.5 9.0 9.3 9.7 9.6 9.5 9.6 10 12 12 13 13 14 17 16 16 16 16 1410 1430 3000 4300 2000 40 30 29 27 26 20 19 19 18 19 38 77 81 214 284 22 18 24 19 19 16 17 18 19 20 429 17 11 9.9 9.3 659 492 349 468 389 10 10 10 9.8 9.1 9.3 8.8 9.8 9.8 9.8 10 10 10 10 9.7 14 14 14 15 14 16 16 17 17 18 1250 1100 1100 1100 1100 25 25 25 25 25 19 17 18 17 16 196 187 124 67 56 19 19 18 19 17 21 22 23 24 25 9.0 9.2 9.3 11 10 539 317 14 11 11 9.2 9.5 9.3 9.4 9.3 9.5 9.1 9.0 9.0 9.1 9.9 11 10 11 11 14 14 14 14 14 82 813 726 878 953 1100 1100 1100 1100 1100 35 25 31 23 22 15 14 14 16 18 13 13 22 30 20 18 18 17 17 17 26 27 28 29 30 31 46 347 991 876 860 818 11 12 14 14 12 --- 9.3 9.3 9.5 9.5 9.3 9.5 9.4 9.5 9.5 9.5 9.5 9.5 11 11 11 14 14 15 65 29 23 933 1040 1100 890 596 --- 1100 1100 1100 1100 1100 1100 21 21 20 20 19 --- 27 14 13 12 12 11 19 18 15 17 14 13 17 16 16 16 15 --- TOTAL 18072.7 MEAN 583 MAX 1390 MIN 9.0 CFSM .00 IN. .00 AC-FT 35850 13480 449 1150 11 .00 .00 26740 316.3 10.2 12 9.1 .00 .00 627 300.1 9.68 18 8.8 .00 .00 595 280.8 10.0 11 9.0 .00 .00 557 484 15.6 65 11 .00 .00 960 1 8378 279 1100 14 .00 .00 6620 44448 1434 4300 548 .00 .00 88160 4457 149 1100 19 .00 .00 8840 538 17.4 27 11 .00 .00 1070 1705 55.0 284 11 .00 .00 3380 1443 48.1 190 12 .00 .00 2860 CAL YR 1985 WTR YR 1986 TOTAL TOTAL 45559.3 93902.9 MEAN MEAN 125 257 MAX MAX 1460 4300 MIN MIN 7.7 8.8 CFSM CFSM .00 .00 IN. IN. .00 .00 AC-FT AC-FT 90370 186300 61 RIO GUAJATACA BASIN 50011400 RIO GUAJATACA ABOVE MOUTH NEAR QUEBRADILLAS, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORD.--Water years 1969 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLT- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1985 10... 0900 E1050 310 8.00 25.0 5.3 8.5 100 12 220 620 DEC 12... 0945 E406 473 7.40 24.0 1.6 7.2 82 <10 66 600 FEB 1986 12... 0940 9.5 581 7.85 24.0 1.1 6.0 72 <10 74 64 APR 29... 1315 E650 348 8.21 25.0 25 8.4 101 16 2800 4100 JUL 11... 0905 19 510 7.41 25.0 2.0 5.9 71 14 260 300 SEP 12... 0905 18 525 7.31 25.0 1.6 6.4 78 17 K60 K210 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- HARD- NONCARB CALCIUM SIUM, SODIUM, AD- SLUM, WATER SULFATE RIDE, NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS . MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1985 10... 160 8 57 3.1 5.0 0.2 1.6 147 <0.5 9.2 7.4 DEC 12... 205 FEB 1986 12... 216 APR 29... 150 8 54 3.2 5.5 0.2 1.8 140 <0.5 11 8.1 JUL 11... 207 -- SEP 12... 210 19 72 7.1 15 0.5 1.3 190 8.8 25 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1985 10... 0.10 5.4 180 0.0 10 0.280 0.020 0.300 0.140 0.36 DEC 12... 6 1.99 0.010 2.00 0.040 0.36 FEB 1986 12... 3 2.48 0.020 2.50 0.040 0.56 APR 29... <0.10 5.9 170 0.0 31 0.680 0.020 0.700 0.050 0.45 JUL 11... 9 <0.010 2.00 0.060 0.14 SEP 12... 0.10 7.2 250 12 4 <0.010 1.60 0.060 0.44 E = estimate K = non-ideal count RIO GUAJATACA BASIN 50011400 RIO GUAJATACA ABOVE MOUTH NEAR QUEBRAD1LLAS, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1985 10... 0.50 0.80 3.5 0.020 2 <100 20 <1 9 10 DEC 12... 0.40 2.4 11 0.020 FEB 1986 12... 0.60 3.1 14 <0.010 APR 29... 0.50 1.2 5.3 0.050 1 <100 30 <1 5 10 JUL 11... 0.20 2.2 9.7 0.010 SEP 12... 0.50 2.1 9.3 0.010 MALAGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- N1UM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1985 10... 610 2 60 0.20 <1 <1 140 <0.010 3 0.04 DEC 12... FEB 1986 12... APR 29... 1300 4 80 <0.10 <1 <1 30 <0.010 <1 0.05 JUL 11... SEP 12... 62 63 . A T L A N 7w C OCEAN MAT ILLO CAMOY QUEBRADIL LAS 20341. • ARECISO 0157 0148 Drainage boundaries indeterminate in limestone terrane aBayaney River underground A rs, Limestone Igneous and L ARES sedimentary rocks • Rio Guaiatioca );‘ . basin : Rio Tonada Rio Grand. do •LITUADO Arecibo basin 2 Drainage boundary Masco basin \ Rio Grande de EXPLANATION A 0148 SURFACE—WATER STATION AND NUMBER • 203 WELL AND WELL NUMBER 2 45 KILOMETERS a I 3 4 5 MILES Figure 12.--Rio Camuy basin. I I I I 64 RIO CAMUY BASIN 50014800 RIO CAMUY NEAR BAYANEY, PR LOCATION .--Lat 18°23'48", long 66°49'04', Hydrologic Unit 21010002, on left bank at Highway 4R8, 1.4 mi (2.2 km) southeast of school at Santiago. 0.9 i (1.4 km) northwest from Escuela Manuel A. Rivera at Bayaney and 9.1 i (14.6 km) upstream from Atlantic Ocean. DRAINAGE AREA.--Indeterminate. WATER-DISCHARGE RECORDS PERIOD OF RECORD.--May 1984 to current year. GAGE.--Water-stage recorder. Elevation of gage is 341 ft (104 m), from topographic map. REMARKS.--Estimated daily discharges: May 2-5 and Aug. 10 to Sept. 2. Records fair except those for estimated daily discharges, which are poor. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 6,450 ft'is (183 m'/s), Oct. 7, 1985, gage height, 17.66 ft (5.383 m), from rating curve extended above 300 ft'is (8.50 10/s) on basis of step-backwater analysis; minimum discharge, 28 ft'/s (0.79 m 3 /s), Mar. 15-17, 1985. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 2,000 ft'/s (56.6 '/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (W/s) (10/s) (ft) (m) Date Time (ft'/s) (0/s) (ft) (m) Oct. 7 0930 *6.450 183 *17.66 5.383 May 5 2015 3,130 88.6 13.89 4.234 Oct. 27 2030 2,400 68.0 12.38 3.773 May 6 1900 2,640 74.8 12.93 3.941 Nov. 5 2030 2,160 61.2 11.82 3.603 May 13 1015 2,830 80.1 13.34 4.066 May 1 2015 2,670 75.6 12.99 3.959 May 14 0115 3,420 9C.8 14.30 4.359 May 2 1645 3,250 92.0 14.06 4.285 Minimum discharge, 28 ft'is (0.79 '/s), Mar. 15-17. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 182 174 95 55 44 32 34 776 160 63 121 150 2 151 153 92 55 39 31 34 1360 140 61 77 600 3 90 323 90 54 57 38 61 1700 128 60 73 435 4 79 434 88 53 104 98 169 1300 118 59 68 388 5 73 671 87 52 61 48 356 1160 111 58 111 157 6 783 452 87 51 50 34 130 1490 104 60 115 110 7 3820 321 85 51 40 32 152 1200 104 69 75 93 8 1320 226 83 50 38 34 266 665 164 95 82 83 9 470 179 83 53 37 32 420 739 121 61 230 77 10 339 159 81 59 37 32 358 634 203 56 700 73 11 261 143 81 54 36 31 125 470 233 60 500 68 12 495 158 79 51 34 31 77 470 140 63 120 66 13 391 143 77 50 34 30 63 1610 117 53 87 64 14 220 151 74 49 34 29 57 1550 101 92 84 63 15 188 473 73 48 33 29 54 579 105 103 74 61 16 157 734 70 48 34 29 50 409 102 109 70 59 17 138 514 71 47 32 179 354 304 88 75 72 58 18 133 294 68 47 34 261 588 248 141 91 68 70 19 123 213 67 46 34 96 220 210 123 65 68 61 20 112 183 67 45 70 56 113 184 103 74 66 55 21 107 179 66 44 80 42 342 161 90 88 62 54 22 103 148 63 44 48 39 295 145 85 53 62 58 23 177 137 63 43 35 37 222 132 80 60 60 60 24 237 126 61 43 33 37 187 132 77 60 62 55 25 202 119 60 43 33 37 186 125 74 65 64 54 26 498 113 60 45 33 36 94 147 76 80 60 63 27 874 107 58 40 33 46 87 214 77 123 60 55 28 674 103 57 40 32 40 233 273 74 80 80 53 29 385 99 57 44 --- 38 359 410 68 67 70 73 30 262 98 57 41 47 384 330 65 98 78 58 31 208 --- 55 66 37 --- 215 --- 113 84 --- TOTAL 13252 7327 2255 1511 1209 1618 6070 19342 3372 2324 3603 3374 MEAN 427 244 72.7 48.7 43.2 52.2 202 624 112 75.0 116 112 MAX 3820 734 95 66 104 261 588 1700 233 123 700 600 MIN 73 98 55 40 32 29 34 125 65 53 60 53 CFSM .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 IN. .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 AC-FT 26290 14530 4470 3000 2400 3210 12040 38360 6690 4610 7150 6690 CAL YR 1985 TOTAL 48669 MEAN 133 MAX 3820 MIN 31 CFSM .00 I. .00 AC-FT 96530 WTR YR 1986 TOTAL 65257 MEAN 179 MAX 3820 MIN 29 CFSM .00 IN. .00 AC-FT 129400 65 RIO CAMUY BASIN 50014800 RIO CAMUY NEAR BAYANEY, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.,-WATER YEARS JUNE 1984 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) MAY, 19 1312 211 264 24.0 AUG, 04 1345 69 289 25.0 JUN, 12 1217 •124 266 23.3 SEP, 12 0959 66 332 24.0 JUL, 08 1139 100 263 24.0 I I I I 66 RIO CAMUY BASIN 50015700 RIO CAMUY NEAR HATILLO, PR LOCATION.--Lat 18°27'44", long 66°49'56", Hydrologic Unit 21010002, 1.8 mi (2.9 km) southwest of Hatillo plaza, and 1.8 i (2.9 km) southeast of Caauy plaza. 1.2 mi (1.9 km) south of Planta de Purificacion, and 3.3 i (5.5 ka) upstream from Atlantic Ocean. DRAINAGE AREA.--Indeterminate. WATER-DISCHARGE RECORDS PERIOD OF RECORD.--June 1984 to current year. GAGE.--Wc.ter-stage recorder. Elevation of gage is 13 ft (4 ). from topographic map. REMARKS.--Estimated daily discharges: May 3-5, 8-19. Records fair except those for estimated daily discharges, which are poor. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 10.500 ft,/s (297 a'/s), Oct. 7, 1985. gage height, 24.75 ft (7.544 a). from rating curve extended above 200 ft'is (5.66 m'/s) on basis of step-backwater analysis; minimum discharge, 36 ft'/s (1.02 '/s), Mar. 19. 1985. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1.800 fti/s (51.0 ma/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (W/s) (a/s) (ft) (a) Date Time (fts/s) (ie/s) (ft) (a) Oct. 7 1315 *10,500 297 *24.75 7.544 Apr. 28 2200 2,800 79.3 15.40 4.694 Oct. 12 2315 2,680 75.9 15.15 4.618 Apr. 29 2145 3,340 94.6 16.44 5.011 Oct. 26 2330 2,820 79.9 15.43 4.703 May 1 2245 5,680 161 20.00 6.096 Oct. 27 2345 3.940 112 17.49 5.331 May 2 1900 8,420 238 22.94 6.992 Oct. 28 2230 2,370 67.1 14.49 4.416 May 3 2015 6,840 194 21.33 6.501 Nov. 5 2300 3,480 98.6 16.69 5.087 May 5 2300 6,600 187 21.06 6.419 Nov. 6 2015 2,170 61.4 14.05 4.282 May 6 2145 6,510 184 20.96 6.389 Nov. 16 0030 3.430 97.1 16.60 5.060 May 13 1245 6,810 193 21.30 6.492 Mar. 17 2330 2,250 64.0 14.24 4.340 May 14 0145 7,750 214 22.08 6.730 Apr. 9 2330 3,620 102 16.94 5.163 Aug 10 2215 3,240 91.8 16.24 4.950 Apr. 18 0115 3,100 87.8 15.99 4.874 Nov. 3 2215 2,250 63.7 14.23 4.337 Minimum discharge, 47 ft'is (1.33 m'/s), Mar. 27. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 273 201 122 67 56 55 51 1570 201 90 133 186 2 419 189 118 67 50 55 50 3900 176 87 92 438 3 130 351 114 66 62 56 51 5280 162 85 87 550 4 107 778 113 65 162 131 185 3000 151 83 83 688 5 100 1100 110 64 95 81 702 2500 142 83 100 179 6 928 1270 109 61 80 64 185 4120 134 84 124 124 7 8150 709 105 61 69 60 284 4050 129 86 88 108 8 2900 296 101 60 66 59 578 1700 176 114 89 98 9 940 211 100 65 64 57 841 2000 167 85 244 91 10 556 188 98 69 62 57 1220 1500 207 80 868 87 11 324 174 97 63 62 56 206 1000 299 78 728 84 12 514 184 96 59 59 56 121 900 164 88 143 81 13 739 203 92 58 59 54 100 5060 148 77 107 80 14 255 174 90 57 58 54 88 5460 129 95 103 79 15 216 982 89 56 58 52 82 1500 125 123 93 76 16 187 2220 87 56 59 52 78 700 133 130 86 74 17 167 1210 86 57 57 233 241 450 116 90 89 73 18 160 522 85 55 59 586 1200 350 129 107 82 81 19 154 320 83 54 57 110 409 300 182 86 83 75 20 143 252 82 53 89 70 277 292 121 83 79 70 21 137 243 80 52 122 58 691 257 118 109 75 70 22 134 202 79 52 78 53 562 231 109 84 73 72 23 151 179 77 51 67 50 312 206 114 80 72 75 24 388 165 76 51 61 48 247 186 106 79 74 71 25 240 156 75 50 60 49 249 195 101 85 76 69 26 575 148 73 52 59 50 138 187 98 87 71 75 27 1300 141 73 49 58 60 129 310 103 127 70 71 28 1320 136 71 49 57 90 571 441 101 97 99 66 29 648 130 70 52 --- 79 1340 678 95 86 86 82 30 303 126 69 50 67 1130 556 92 108 97 73 31 235 --- 68 66 56 --- 275 --- 133 103 --- TOTAL 22793 13160 2788 1787 1945 2658 12318 49154 4228 2909 4397 4046 MEAN 735 439 89.9 57.6 69.5 85.7 411 1586 141 93.8 142 135 MAX 8150 2220 122 69 162 586 1340 5460 299 133 868 688 MIN 100 126 68 49 50 48 50 186 92 77 70 66 CFSM .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 IN. .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 AC-FT 45210 26100 5530 3540 3860 5270 24430 97500 8390 5770 8720 8030 .00 IN. .00 AC-FT 145400 WTR YR 1986 TOTAL 122183 MEAN 335 MAX 8150 MIN 48 CFSM .00 CAL YR 1985 TOTAL 73305 MEAN 201 MAX 8150 MIN 39 CFSM IN. .00 AC-FT 242300 67 RIO CAMUY BASIN 50015700 RIO CAMUY NEAR HATILLO, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS AUGUST 1984 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) NOV, 12 1118 160 299 23.5 JUL, 08 0852 130 303 23.5 DEC, 10 1047 98 307 23.0 AUG, 04 1029 83 324 24.0 JUN. 12 0853 159 295 23.0 SEP, 02 1044 145 295 24.0 I   69 HATILLO ARECI BARCELONE TA 0135 Bayaney Drainage boundaries indeterminate in limestone terrane Li mestone Igneous and mentory rock's `0280 Rib Comuy basin R,a Grand* di AEnsca basin RiRo Guayonillo basin --Map area 6AJA6tB0 UTUADO LOCO Viv Logo Poliojos Logo Artjuntos 0205 ADJUNTAS Ftio Partu basin Rio TMlobo° basin 4 FIanda S JAY YA Ft;:z, intiborl ucon.dt›,in basin EXPLANATION A 0284 SURFACE—WATER STATION AND NUMBER 0205 QUALITY—OF—WATER STATION AND NUMBER 025110 QUALITY—OF—WATER PARTIAL RECORD STATION AND NUMBER • 135 WELL AND WELL NUMBER 5 KILOMETERS 5 MILES Figure 13.--Rio Grande de Arecibo basin. 70 RIO GRANDE DE ARECIBO BASIN 50020500 RIO GRANDE DE ARECIBO NEAR ADJUNTAS, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°10'54", long 66°44'12", at Highway 135 bridge, 1.0 mi (1.6 km) upstream from Lago Adjuntas, and 1.5 mi (2.4 km) northwest of Adjuntas plaza. DRAINAGE AREA.--12.7 sq mi (32.9 sq km) this does not include 6.0 sq mi (15.6 sq k,i) above Lago Garzas. PERIOD OF RECORD.--Water years 1969-74, 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1985 30... 1540 90 7.20 21.5 230 9.0 105 49 DEC 17... 0800 25 280 7.80 19.0 1.0 <10 <30 5800 FEB 1986 19... 0830 12 337 8.05 18.5 1.0 9.1 103 32 26000 42000 MAY 07... 0835 35 332 7.80 21.5 50 7.9 94 21 2400 K14000 JUL 18... 0835 13 326 7.80 22.5 13 7.8 94 <10 K10000 K15000 SEP 18... 0805 12 370 7.68 21.0 1.2 7.6 90 26 310 300 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- HARD- NONCARB CALCIUM SLUM, SODIUM, AD- SIUM, WATER SULFATE RIDE, NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE 01S- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) iS SO4) AS CL) OCT 1985 30... 35 2 9.0 3.0 5.3 0.4 1.4 33 <0.5 8.8 5.4 DEC 17... 101 FEB 1986 19... 106 MAY 07... 85 6 21 7.8 16 0.8 2.3 79 <0.5 9.9 19 JUL 18... 107 SEP 18... 120 2 31 10 21 0.9 2.2 117 9.9 27 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/i (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1985 30... <0.10 14 67 0.0 780 0.460 0.040 0.500 0.080 0.82 DEC 17... 1 1.44 0.060 1.50 0.060 FEB 1986 19... 7 0.900 0.100 1.00 0.070 0.43 MAY 07... <0.10 26 150 14 72 1.16 0.040 1.20 0.170 0.43 JUL 18... 8 0.950 0.050 1.00 0.150 1.1 SEP 18... 0.10 30 200 6.7 2 0.950 0.050 1.00 0.050 0.35 K = non-ideal count 71 RIO GRANDE DE ARECIBO BASIN 50020500 RIO GRANDE DE ARECIBO NR ADJUNTAS, PR--Continued WATER QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1985 30.., 0.90 1.4 6.2 0.140 <1 100 30 <1 45 50 DEC 17... <0.20 0.120 FEB 1986 19... 0.50 1.5 6.6 0.160 MAY 07... 0.60 1.8 8.0 0.110 <1 100 20 <1 6 10 JUL 18... 1.3 2.3 10 0.140 SEP 18... 0.40 1.4 6.2 0.160 -- MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELF- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1985 30... 31000 35 1000 0.10 <1 <1 110 <0.010 <1 DEC 17... FEB 1986 19... MAY 07... 2600 1 120 <0.10 <1 <1 30 <0.010 1 0.05 JUL 18... SEP 18... I RIO GRANDE DE ARECIBO BASIN 50025000 RIO GRANDE DE ARECIBO NEAR UTUADO, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°18'11", long 66°41'59", at bridge near Highway 10 at km 56.4, 0.5 mi (0.8 km) downstream from Rio de Caguana, and 2.5 mi (4.0 km) north of Utuado plaza. DRAINAGE AREA.--66.0 sq mi (170.9 sq km) this excludes 6.0 sq mi (15.5 sq km) upstream fro Lago Garzas, which is a diversion 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 1985 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER !TY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 10G ML) 100 ML) OCT 1985 29... 1500 536 165 7.60 25.5 80 15 21000 7500 DEC 16... 1430 107 262 7.80 27.0 5.4 <10 52000 5600 FEB 1986 18... 1610 39 265 8.10 26.5 6.2 7.2 91 22 K16000 4900 MAY 06... 1440 165 198 7.65 26.0 90 7.6 94 13 24000 1000 JUL 17... 1410 82 266 7.80 27.5 10 7.3 93 <10 24000 3200 SEP 17... 1425 35 290 7.88 33.0 7.0 7.2 102 34 3000 320 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- HARD- NONCARB CALCIUM SLUM, SODIUM, AD- S1UM, WATER SULFATE RIDE, NESS WATER DIS- DIS- DIS- SORP- D1S- TOTAL SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1985 29... 53 0 13 5.0 8.5 0.5 2.4 55 <0.5 18 8.1 DEC 16... 89 FEB 1986 18... 80 MAY 06... 75 69 20 6.2 10 0.5 2.2 7 <0,5 22 8.7 JUL 17... 75 SEP 17... 98 13 27 7.4 14 0.6 3.2 85 22 13 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1985 29... <0.10 20 110 156 189 1.07 0.030 1.10 0.070 0.33 DEC 16... - 2 1.37 0.030 1.40 0.050 FEB 1986 18... 15 1.25 0.050 1.30 0.030 0.57 MAY 06... <0.10 24 97 43 176 1.18 0.020 1.20 0.100 0.60 JUL 17... 68 1.07 0.030 1.10 0.020 0.38 SEP 17... 0.20 29 170 16 11 1.05 0.050 1.10 0.030 0.37 K . non-ideal count 72 73 RIO GRANDE DE ARECIBO BASIN 50025000 RIO GRANDE DE ARECIBO NEAR UTUADO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MUNIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1985 29... 0.40 1.5 6.6 0.120 <1 100 20 1 21 60 DEC 16... <0.20 0.150 - FEB 1986 18... 0.60 1.9 8.4 0.190 MAY 06... 0.70 1.9 8.4 0.140 <1 200 30 <1 8 40 JUL 17... 0.40 1.5 6.6 0.130 -- SEP 17... 0.40 1.5 6.6 0.210 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1985 29 .. 11000 7 480 <0.10 <1 <1 60 <0.010 <1 0.05 DEC 16... FEB 1986 18... MAY 06... 8900 <1 400 <0.10 <1 <1 60 <0.010 1 0.05 JUL 17... SEP 17... I I RIO GRANDE DE ARECIBO BASIN 50026050 RIO CAONILLAS ABOVE LAGO CAONILLAS NEAR JAYUYA, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°13'26", long 66°38'22", 300 ft (91 ) off Highway 531, 700 ft (213 a) upstreaa fro Lago Caonillas, 3.3 mi (5.3 km) northwest of Jayuya plaza. DRAINAGE AREA.--40.4 sq ai (104.6 sq ka). PERIOD OF RECORD.--Water years 1979 to current year. OXYGEN, OXYGEN COLI- STREP- SPE- 018- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE BID- D1S- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1985 30... 1025 125 7.60 23.0 50 14 K7500 3400 DEC 17... 1200 66 208 8.10 23.0 9.0 <10 K640 K130 FEB 1986 19... 1310 36 248 8.65 20.0 3.0 9.4 107 20 550 350 MAY 07... 1220 207 7.80 24.0 80 8.2 100 31 5600 5000 JUL 18... 1150 36 223 7.80 27.5 76 7.9 102 22 K7700 K2800 SEP 18... 1205 29 232 7.54 26.5 0.70 7.8 100 30 K7500 3400 HARD- ALKA- NESS MAGNE- SODIUM POTAS- UNITY CHLO- HARD- NONCARB CALCIUM SLUM, SODIUM, AD- SIUM, WATER SULFATE RIDE, NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED LION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1985 30... 46 6 12 4.0 8.1 0.5 1.8 40 <0.5 11 6.4 DEC 17... -- 71 FEB 1986 19... 79 MAY 07... 44 4 11 3.9 8.0 0.5 1.7 40 <0.5 11 7.8 JUL 18... 72 SEP 18... 73 7 19 6.2 11 0.6 2.1 66 16 11 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS ti) AS N) OCT 1985 30... 0.10 22 89 0.0 125 0.020 <0.100 0.060 0.34 DEC 17... 19 0.890 0.010 0.900 0.030 0.27 FEB 1986 19... 9 <0.010 0.500 0.030 0.37 MAY 07... 0.10 21 88 0.0 104 1.08 0.020 1.10 0.040 0.66 JUL 18... 119 0.570 0.030 0.600 0.060 0.44 SEP 18... 0.10 21 130 10 152 0.580 0.020 0.600 0.060 0.24 K = non-ideal count 74 RIO GRANDE DE ARECIBO BASIN 50026050 RIO CAONILLAS ABOVE LAGO CAONILLAS NEAR JAYUYA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA t NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS H) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1985 30... 0.40 0.080 <1 100 30 1 10 40 DEC 17... 0.30 1.2 5.3 0.070 FEB 1986 19... 0.40 0.90 4.0 0.050 MAY 07... 0.70 1.8 8.0 0.120 <1 100 20 <1 12 30 JUL 18... 0.50 1.1 4.9 0.180 SEP 18... 0.30 0.90 4.0 0.110 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ENABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PO) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1985 30... 8400 2 250 <0.10 <1 <1 50 <0.010 <1 0.04 DEC 17... FEB 1986 19... MAY 07... 2000 2 250 <0.10 <1 <1 20 <0.010 3 0.04 JUL 18... -- SEP 18... 75 76 RIO GRANDE DE ARECIBO BASIN 50027250 RIO GRANDE DE ARECIBO BELOW LAGO DOS BOCAS NEAR FLORIDA, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°20'50", long 66°40'02", at pedestrian bridge, 0.7 mi (1.1 km) downstream from Lago Dos Bocas and 6.6 mi (10.6 km) west of Florida plaza. DRAINAGE AREA.--169 sq mi (436 sq km) does not include 6.0 sq mi (15.6 sq km) above Lago Garzas. PERIOD OF RECORD.--Water years 1970-71, 1974 to current year. OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1985 29... 1130 141 7.40 24.5 280 22 3500 28000 DEC 16... 1220 199 7.40 24.0 4.5 <10 38 K20 FEB 1986 18... 1345 113 198 7.75 25.0 2.4 5.5 67 39 K10 K16 MAY 06... 1015 148 7.38 24.0 200 6.5 77 21 K1500 9300 JUL 17... 1020 199 7.15 26.5 4.0 3.4 42 25 K45 K20 SEP 17... 1115 247 7.15 27.5 3.0 3.7 47 84 K18 <10 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- HARD- NONCARB CALCIUM SIUM, SODIUM, AD- SLUM, WATER SULFATE RIDE, NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1985 29... 55 7 15 4.3 8.3 0.5 2.3 48 <0.5 17 8.0 DEC 16... 69 FEB 1986 18... 67 MAY 06... 48 5 13 3.7 7.1 0.5 2.2 43 <0.5 9.8 7.7 JUL 17... 71 SEP 17... 82 2 22 6.5 11 0.5 2.2 80 15 10 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1985 29... <0.10 19 100 0.0 298 0.740 0.060 0.800 0.100 0.70 DEC 16... 2 <0.010 0.800 0.020 0.28 FEB 1986 18... 5 0.490 0.010 0.500 0.040 0.36 MAY 06... 0.10 17 86 0.0 200 0.760 0.040 0.800 0.100 0.60 JUL 17... 5 0.180 0.020 0.200 0.180 0.42 SEP 17... 0.10 23 140 0.0 2 <0.010 0.100 0.140 0.36 K = non-ideal count RIO GRANDE DE ARECIBO BASIN 50027250 RIO GRANDE DE ARECIBO BELOW LAGO DOS BOCAS NEAR. FLORIDA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PROS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1985 29... 0.80 1.6 7.1 0.140 <1 100 50 <1 23 50 DEC 16... 0.30 1.1 4.9 0.030 FEB 1986 18... 0.40 0.90 4.0 0.020 -- MAY 06... 0.70 1.5 6.6 0.080 1 100 20 <1 15 20 JUL 17... 0.60 0.80 3.5 0.020 SEP 17... 0.50 0.60 2.7 0.030 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB DATE '(UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CM) (UG/L) (MG/L) OCT 1985 29... 13000 3 300 <0.10 <1 <1 70 <0.010 <1 0.04 DEC 16... FEB 1986 18... MAY 06... 12000 2 240 <0.10 <1 <1 30 <0.010 <1 0.08 JUL 17... SEP 17... 77 I I I I I I I I 78 RIO GRANDE DE ARECIBO BASIN 50027750 RIO GRANDE OE ARECIBO ABOVE ARECIBO, PR LOCATION.--Lat 18'25'29", long 66'41'44", Hydrologic Unit 21010002, 0.8 i (1.3 km) upstream from Rio Tanama, 4.0 i (6.4 km) south of Arecibo and 6.7 mi (10.8 km) above mouth, and 10.2 mi (16.4 km) downstream from Lago Dos Bocas. DRAINAGE AREA.--200 mi' (520 km 2 ), approximately, of which an undetermined amount does not contribute directly to surface runoff. WATER-DISCHARGE RECORDS PERIOD OF RECORD.--April 1982 to current year. GAGE.--Water-stage recorder. Elevation of gage is 30 ft (9 m), fro topographic map. REMARKS.--Estimated daily discharges: Oct. 7 to Nov. 15. Records fair except those for estimated daily discharges, which are poor. Flow regulated by Lago Dos Bocas Dam 10.2 mi (16.4 km) upstream. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 45,800 ft'/s (1,300 '/s), May 18, 1985, gage height, 18.22 ft (5.553 ), from floodmark, from rating curve extended above 2,400 ft'/s (68.0 '/s) on basis of slope-area measurement of peak flow; minimum discharge, 30 ft'/s (0.850 m'/s), Mar. 30, 1986. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 4,300 ft'is (122 '/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (10/s) (ft) (m) Date Time (ft7s) (e/s) (ft) (m) Oct. 7 0900 *41,200 1,167 *17.85 5.441 May 13 1230 9,470 268 12.90 3.932 May 1 2215 5,520 156 10.67 3.252 May 14 0115 25,900 733 16.31 4.971 May 2 2030 4,320 122 9.51 2.899 Minimum discharge, 30 ft'/s (0.850 3/s), Mar. 30. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 209 1570 682 152 215 86 380 2410 1070 57 941 65 2 695 2530 891 322 64 223 234 2930 946 53 218 796 3 142 2400 305 818 639 370 309 2130 975 194 444 709 4 467 630 530 416 301 166 559 1770 969 59 90 179 5 122 1670 271 95 232 67 473 1850 828 125 186 259 6 1630 2530 257 60 374 148 636 2060 852 73 558 92 7 12900 2170 633 55 180 314 689 1960 305 610 377 723 8 3500 2150 438 186 122 85 802 1960 574 108 368 741 9 3000 800 936 86 49 47 789 1880 881 301 79 98 10 2470 1130 530 47 169 261 862 1840 946 234 104 193 11 2420 1900 637 108 436 404 568 1530 971 491 620 229 12 2360 1900 275 70 510 427 431 436 950 99 930 598 13 2230 1870 511 562 419 420 220 4670 927 59 618 109 14 2180 1410 419 134 326 428 410 10700 571 443 322 58 15 1480 1540 438 127 149 338 416 3050 229 338 190 720 16 2530 2530 542 203 82 113 69 2010 698 514 73 624 17 2270 2000 315 176 127 362 364 1790 663 500 53 453 18 1670 1850 423 404 410 344 1120 1740 1160 661 90 526 19 1630 1110 236 157 466 364 1370 1700 881 167 49 163 20 1500 986 288 538 448 347 1220 1360 684 63 98 58 21 755 1210 190 246 406 273 1260 1020 464 172 73 53 22 1060 866 159 130 101 73 458 933 99 457 48 121 23 430 557 370 60 124 63 447 1320 206 876 45 114 24 1140 648 177 55 374 347 503 1250 561 758 46 240 25 810 958 150 88 459 338 435 897 722 115 45 471 26 1700 889 139 226 331 347 357 1100 739 109 195 483 27 1800 750 153 378 325 202 179 1130 112 194 67 88 28 1670 425 126 201 308 50 731 989 69 60 494 53 29 2530 670 77 239 --- 47 770 1240 241 530 553 78 30 2530 739 87 337 42 1460 1360 62 889 463 56 31 1670 --- 620 408 323 --- 981 --- 966 119 --- TOTAL 61500 42388 11805 7084 8146 7419 18521 61996 19355 10275 8556 9150 MEAN 1984 1413 381 229 291 239 617 2000 645 331 276 305 MAX 12900 2530 936 818 639 428 1460 10700 1160 966 941 796 MIN 122 425 77 47 49 42 69 436 62 53 45 53 CFSM 9.92 7.06 1.90 1.14 1.45 1.19 3.08 10.0 3.22 1.65 1.38 1.52 IN. 11.44 7.88 2.20 1.32 1.52 1.38 3.44 11.53 3.60 1.91 1.59 1.70 AC-FT 122000 84080 23420 14050 16160 14720 36740 123000 38390 20380 16970 18150 CAL YR 1985 TOTAL 249008 MEAN 682 MAX 14800 MIN 40 CFSM 3.41 IN. 46.32 AC-FT 493900 WTR YR 1986 TOTAL 266195 MEAN 729 MAX 12900 MIN 42 CFSM 3.64 IN. 49.51 AC-FT 528000 79 RIO GRANDE DE ARECIBO BASIN 50027750 RIO GRANDE DE ARECIBO ABOVE ARECIBO, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS APRIL 1982 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) OCT, 01 1100 114 231 25.5 JUL, 10 1000 78 254 27.0 NOV, 14 1204 222 225 25.0 AUG, 12 1045 120 254 27.0 DEC, 12 1109 122 246 23.5 SEP, 12 1022 130 251 26.5 JUN, 16 1009 126 225 25.5 I I I I I I I I I 80 RIO GRANDE DE ARECIBO BASIN 50028000 RIO TANAMA NEAR UTUADO, PR LOCATION.--Lat 18'18'02", long 66°46'58'. Hydrologic Unit 21010001, on downstream side of left abutment of bridge on Highway 111, 1.2 i (1.9 km) upstream fro natural tunnel, 1.5 •i (2.4 km) northeast of Angeles. and 5.8 mi (9.3 km) northwest of Utuado. DRAINAGE AREA.--18.4 i' (47.7 km'). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--June 1944 to June 1958 (daily stage and two to four measurements per month by Puerto Rico Water Resources Authority), November 1959 to current year. GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 938.32 ft (286.00 m) above mean sea level. Datum of gage was lowered 3.00 ft (0.914 m) on Oct. 1978. Prior to Nov. 1/, 1966, non-recording gage and Nov. 17, 1966 to Sept. 30, 1978 recording gage, both at present site. REMARKS.--Estimated daily discharges: Oct. 9, 10, Oct. 29 to Nov. 1, Nov. 8-14. Apr. 21-25. May 5-19. Records fair except those for estimated daily discharges, which are poor. AVERAGE DISCHARGE.--26 years (1961-86). 49.1 ft'/s (1.390 '/s), 36.24 in/yr (920 mm/yr), 35,570 acre-ft/yr (43.8 hm'/yr); median of yearly mean discharges, 48 ft'/s (1.36 '/s), 34,800 acre-ft/yr (43 h•'/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge. 12.190 ft'/s (345 '/s), May 18, 1985, gage height, 17.45 ft (5.319 m) new datum in use, fro floodmark and recorder, from rating curve extended above 500 ft'/s (14.2 m'/s) on basis of slope-area measurement of peak flow; minimum discharge, 6.6 ft'/s (0.187 '/s), June 12, 1977. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 3,000 ft'/s (85.0 '/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (e/s) (ft) (m) Date Time (ft'/s) (e/s) (ft) (m) Oct. 6 1730 4,580 130 13.64 4.157 Apr. 30 1745 4,410 125 13.45 4.100 Oct. 7 0645 *7.840 222 *15.69 4.782 May 1 1630 3,070 86.9 11.77 3.587 Minimum discharge, 14 ft'is (0.396 m'/s), Mar. 14-16, 22-24, 27. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTENBER 1986 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 54 115 64 33 24 19 17 352 87 41 41 68 2 39 107 63 33 27 18 16 308 81 41 36 43 3 34 128 62 32 77 19 83 256 78 40 35 35 4 32 123 61 31 49 19 46 263 75 3q 44 33 5 34 199 60 30 33 18 141 210 72 40 46 30 6 388 124 58 30 29 17 39 190 68 43 35 28 7 1510 103 56 30 27 17 25 240 88 41 126 27 8 381 90 54 29 25 17 58 200 92 40 57 27 9 200 80 53 36 24 16 66 170 72 38 48 27 10 140 75 52 34 24 15 34 150 92 36 51 26 11 114 75 52 29 24 16 25 150 75 45 52 25 12 193 80 51 27 23 16 22 140 82 39 36 25 13 103 85 48 27 23 16 21 330 73 ::6 41 25 14 119 115 46 26 23 15 20 440 64 55 36 24 15 102 193 46 26 22 15 22 200 129 60 33 22 16 81 224 45 26 21 15 65 150 72 56 30 22 17 70 164 44 27 23 16 146 120 60 98 30 25 18 69 135 43 26 22 22 185 110 80 59 30 26 19 63 107 42 25 21 21 79 100 58 43 30 23 20 60 100 41 25 24 16 92 88 52 61 30 22 21 74 101 40 24 22 16 85 78 50 59 28 22 22 61 88 40 27 20 14 35 73 48 44 29 28 23 154 84 39 25 19 14 30 68 47 42 34 25 24 101 80 38 25 19 15 30 92 47 47 33 24 25 78 77 37 39 20 17 25 72 46 43 40 26 26 167 74 36 34 19 16 27 68 47 41 40 23 27 322 72 35 23 19 17 25 68 47 43 29 21 28 292 69 35 25 19 16 30 96 44 42 36 30 29 170 67 34 26 --- 16 62 183 43 40 60 25 30 155 65 34 56 16 445 114 42 4I' 57 22 31 130 --- 33 29 15 --- 94 --- 44 39 --- TOTAL 5490 3199 1442 915 722 515 1996 5173 2011 1437 1292 829 MEAN 177 107 46.5 29.5 25.8 16.6 66.5 167 67.0 46.4 41.7 27.6 MAX 1510 224 64 56 77 22 445 440 129 S8 126 68 MIN 32 65 33 23 19 14 16 68 42 35 28 21 CFSM 9.62 5.82 2.53 1.60 1.40 .90 3.61 9.08 3.64 2.52 2.27 1.50 IN. 11.10 6.47 2.92 1.85 1.46 1.04 4.04 10.46 4.07 2.91 2.61 1.68 AC-FT 10890 6350 2860 1810 1430 1020 3960 10260 3990 2850 2560 1640 CAL YR 1985 TOTAL 22815 MEAN 62.5 MAX 1890 MIN 17 CFSM 3.40 IN. 46.13 AC-FT 45250 WTR YR 1986 TOTAL 25021 MEAN 68.6 MAX 1510 MIN 14 CFSM 3.73 IN. 50.59 AC-FT 49630 RIO GRANDE DE ARECIBO BASIN 50028000 RIO TANAMA NEAR UTUADO, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORD.--Water years 1958 to current year. PERIOD OF DAILY RECORD.-- SUSPENDED SEDIMENT DISCHARGE: January 1968 to current year. REMARKS.--Sediment samples were collected by a local observer on a weekly basis and during high flow events. Estimates for period of missing daily record were made from a sediment transport curve developed from a period of record over 5 years. EXTREMES FOP PERIOD OF DAILY RECORD.-- SEDIMENT Cuh,:r.NTRATIONS: Maximum daily mean, 20,400 mg/L November 27, 1968; minimum daily mean, 0 mg/L during water year 1985. SEDIMENT LOADS: Maximum daily, 167,000 tons (152,000 tonnes) May 18, 1985, minimum daily, 0.0 ton (0.0 tonne) during many years. EXTREMES FOR CURRENT YEAR.-- SEDIMENT CONCENTRATIONS: Maximum daily mean, 9,340 mg/L October 07, 1985; minimum daily mean, 5.0 mg/L JAN 23-24,1986. SEDIMENT LOADS: Maximum daily, 79,000 tons (72,000 tonnes) October 07, 1985; minimum daily, 0.34 ton (0.31 tonne) JAN 23-24,1986. WATER-QUALITY DATA, WATER YEARS OCTOBER 1985 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1985 10... 1450 133 139 7.60 23.0 5.0 <10 240 730 DEC 13... 1200 48 156 7.90 21.0 4.2 50 K73 360 FEB 1986 13... 102) 25 162 8.15 19.0 5.3 9.3 104 11 K60 320 APR 16... 1310 21 173 8.01 24.5 140 8.7 107 69 K1900 2800 JUL 8... 1230 40 151 8.15 25.0 1.6 8.5 105 13 K40 K110 SEP 9... 1435 25 183 8.20 28.0 2.9 8.2 109 16 K90 260 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- HARD- NONCARB CALCIUM SIUM, SODIUM, AD- SLUM, WATER SULFATE RIDE, NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1985 10... 46 5 11 4.5 6.4 0.4 1.5 41 <0.5 11 7.4 DEC 13... 51 FEB 1986 13... 51 APR 16... 55 7 14 4.9 9.5 0.6 2.7 48 <0.5 12 8.8 JUL 8... 51 SEP 9... 61 4 15 5.7 8.3 0.5 1.8 57 11 8.1 K = non-ideal cuunt 81 RIO GRANDE DE ARECIBO BASIN 50028000 RIO TANAMA NEAR UTUADO, PR--Continued WATER-QUALITY DATA, WATER YEARS OCTOBER 1985 TO SEPTEMBER 1986 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEM, GEN, GEM, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+1403 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) S102) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1985 <0.10 23 89 32 8 0.990 0.010 1.00 0.020 0.18 DEC 13... 5 <0.010 0.800 0.020 0.28 FEB 1986 13... 5 <0.010 0.700 0.020 APR 16... <0.10 22 100 5.7 126 0.680 0.020 0.700 0.060 0.44 JUL 8... 9 <0.010 0.700 0.020 0.28 SEP 9... <0.10 25 110 7.4 4 <0.010 0.600 0.050 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PROS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1985 10... 0.20 1.2 5.3 0.020 <1 <100 30 <1 9 20 DEC 13... 0.30 1.1 4.9 0.020 FEB 1986 13... <0.20 0.010 -- APR 16... 0.50 1.2 5.3 0.050 <1 100 <10 <1 8 20 JUL 8... 0.30 1.0 4.4 0.020 SEP 9... <0.20 0.020 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1985 10... 1000 2 50 <0.10 <1 <1 40 <0.010 5 0.04 DEC 13... FEB 1986 13... APR 16... 2700 2 140 <0.10 <1 <1 30 <0.010 2 0.04 JUL 8... SEP 9... 82 83 RIO GRANDE DE ARECIBO BASIN 50028000 RIO TANAMA NEAR UTUADO, PR--Continued WATER-QUALITY DATA, WATER YEARS OCTOBER 1985 TO SEPTEMBER 1986 PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT SED. SED. SED. SEDI- SUSP. SUSP. SUSP. MENT, FALL FALL FALL STREAM- SEDI- DIS- DIAM. DIAN. DIAM. FLOW, MENT, CHARGE, PERCENT PERCENT PERCENT INSTAN- SUS- SUS- FINER FINER FINER DATE TIME TANEOUS PENDED PENDED THAN THAN THAN (CFS) (MG/L) (T/DAY) .002 MM .004 MM .008 MM OCT 1985 07... 0720 3820 45000 464000 4 5 9 APR 1986 30... 1740 4320 18100 211000 7 13 19 MAY 01... 1620 2000 11700 63200 5 7 11 01... 1650 1620 13700 59900 6 10 15 02... 1600 1600 15300 66100 4 7 10 02... 1615 1310 6530 23100 10 16 24 04... 1755 810 2720 5950 14 22 35 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 OCT 1985 07... 13 18 28 40 60 87 99 APR 1986 30... 27 35 48 64 83 96 99 NAY 01... 15 23 27 40 75 94 99 01... 23 30 41 57 81 97 100 02... 15 19 33 49 69 93 99 02... 34 43 53 70 88 98 100 04... 54 65 74 80 85 92 98 84 RIO GRANDE DE ARECIBO BASIN 50028000 RIO TANAMA NEAR UTUADO, PR--Continued SEDIMENT DISCHARGE. SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) OCTOBER NOVEMBER DECEMBER 1 54 99 39 115 100 31 64 11 1.9 2 39 24 2.7 107 100 29 63 11 1.9 3 34 15 3.2 128 402 230 62 11 1.8 4 32 18 3.0 123 287 134 61 11 1.8 5 34 19 1.8 199 1010 2810 6U 11 1.8 6 388 2870 24900 124 326 151 58 11 1.7 7 1510 9340 79900 103 185 53 56 11 1.7 8 381 1980 2980 90 125 30 54 11 1.6 9 200 550 297 80 110 24 53 12 1.7 10 140 325 123 75 100 20 52 12 1.7 11 114 238 73 75 100 20 52 12 1.7 12 193 948 2050 80 110 24 51 12 1.7 13 103 234 76 85 152 48 48 15 1.9 14 119 495 513 115 340 157 46 16 2.0 15 102 261 106 193 761 772 46 15 1.9 16 81 130 28 224 809 517 45 15 1.8 17 70 120 23 164 520 259 44 12 1.4 18 69 95 19 135 358 147 43 IO 1.2 19 63 60 10 107 218 63 42 10 1.1 20 60 50 8.1 100 207 58 41 10 1.1 21 74 179 90 101 172 50 40 10 1.1 22 61 70 12 88 54 13 40 10 1.1 23 154 988 1880 84 18 4.1 39 8 .71 24 101 231 93 80 18 3.9 38 8 .82 25 78 116 27 77 17 3.5 37 8 .80 26 167 824 1520 74 16 3.2 36 9 .87 27 322 2190 11500 72 15 2.9 35 10 .95 28 292 1460 3420 69 12 2.2 35 10 .95 29 170 575 293 67 12 2.2 34 10 .92 30 155 230 96 65 11 1.9 34 10 .92 31 130 120 42 --- --- --- 33 10 .89 TOTAL 5490 130128.8 3199 5663.9 1442 43.43 85 RIO GRANDE DE ARECIBO BASIN 50028000 RIO TANAMA NEAR UTUADO, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) JANUARY FEBRUARY MARCH 1 33 10 .89 24 7 .45 19 22 1.1 2 33 10 .89 27 9 .66 18 20 .97 3 32 10 .86 77 138 44 19 20 1.0 4 31 10 .84 49 54 8.0 19 20 1.0 5 30 10 .81 33 30 2.7 18 16 .78 6 30 10 .81 29 20 1.6 17 15 .69 7 30 10 .81 27 20 1.5 17 18 .83 8 29 10 .78 25 21 1.4 17 18 .83 9 36 23 2.9 24 20 1.3 16 17 .73 10 34 21 2.1 24 20 1.3 15 16 .65 11 29 8 .63 24 20 1.3 16 16 .69 12 27 8 .58 23 20 1.2 16 16 .69 13 27 8 .58 23 20 1.2 16 17 .73 14 26 7 .49 23 20 1.2 15 22 .89 15 26 7 .49 22 20 1.2 15 20 .81 16 26 7 .49 21 20 1.1 15 20 .81 17 27 6 .44 23 20 1.2 16 15 .65 18 26 6 .42 22 20 1.2 22 23 2.6 19 25 6 .41 21 20 1.1 21 14 .91 20 25 6 .41 24 23 1.7 16 12 .52 21 24 6 .44 22 17 1.0 16 12 .52 22 27 8 .66 20 15 .81 14 12 .45 23 25 5 .34 19 13 .67 14 12 .45 24 25 5 .34 19 18 .92 15 13 .53 25 39 49 12 20 20 1.1 17 12 .55 26 34 26 3.6 19 20 1.0 16 11 .48 27 23 7 .43 19 22 1.1 17 12 .55 28 25 11 .85 19 22 1.1 16 12 .52 29 26 10 .70 --- --- 16 11 .48 30 56 150 82 16 10 .43 31 29 13 1.2 15 10 .41 TOTAL 915 119.19 722 83.01 515 23.25 86 RIO GRANDE DE ARECIBO BASIN 50028000 RIO TANAMA NEAR UTUADO, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) APRIL MAY JUNE 1 17 10 .46 352 2570 13300 87 40 9.4 2 16 10 .43 308 1780 5560 81 40 8.7 3 83 274 164 256 1280 2800 78 35 7.4 4 46 174 30 263 1390 3040 75 35 7.1 5 141 514 436 210 1430 2930 72 30 5.8 6 39 53 5.8 190 1350 2650 68 25 4.6 7 25 49 3.3 240 1680 2800 88 152 59 8 58 420 723 200 1020 1120 92 182 54 9 66 276 265 170 754 549 72 80 16 10 34 54 5.2 150 1070 1270 92 168 74 11 25 50 3.4 150 910 973 75 110 22 12 22 55 3.3 140 1490 3470 82 123 35 13 21 55 3.1 330 2020 6080 73 69 16 14 20 50 2.7 440 900 614 64 30 5.2 15 22 54 3.4 200 775 481 129 774 1910 16 65 230 154 150 455 268 72 104 23 17 146 770 1580 120 155 84 60 60 9.7 18 185 1010 3120 110 125 63 80 194 98 19 79 125 31 100 100 48 58 34 5.8 20 92 181 72 88 45 11 52 25 3.5 21 85 282 226 78 45 9.5 50 23 3.1 22 35 70 6.6 73 40 7.9 48 21 2.7 23 30 60 4.9 68 40 7.3 47 20 2.5 24 30 60 4.9 92 218 135 47 20 2.5 25 25 50 3.4 72 97 21 46 19 2.4 26 27 46 9.3 68 94 20 47 17 2.2 27 25 20 1.4 68 104 24 47 17 2.2 28 30 26 2.0 96 241 180 44 18 2.1 29 62 180 105 183 834 1440 43 19 2.2 30 445 3190 26700 114 156 54 42 20 2.3 31 --- --- --- 94 40 10 --- --- --- TOTAL 1996 33669.59 5173 50019.7 2011 2398.4 87 RIO GRANDE DE ARECIBO BASIN 50028000 RIO TANAMA NEAR UTUADO, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) JULY AUGUST SEPTEMBER 1 41 20 2.2 41 25 2.8 68 155 80 2 41 19 2.1 36 13 1.3 43 30 3.5 3 40 19 2.1 35 14 1.3 35 15 1.4 4 39 16 1.7 44 37 8.9 33 12 1.1 5 40 15 1.6 46 50 8.5 30 10 .81 6 43 13 1.5 35 10 .95 28 10 .76 7 41 15 1.7 126 952 3990 27 9 .66 8 40 18 1.9 57 61 10 27 9 .66 9 38 20 2.1 48 58 10 27 9 .66 10 36 20 1.9 51 90 36 26 9 .63 11 45 44 8.1 52 8.3 22 25 8 .54 12 39 18 1.9 36 12 1.2 25 8 .54 13 35 15 1.4 41 26 3.6 25 8 .54 14 55 91 26 36 18 1.7 24 8 .52 15 60 " 21 33 15 1.3 22 8 .48 16 21 30 13 1.1 22 8 .48 17 cao 30 13 1.1 25 10 .84 18 30 12 .97 26 10 .70 19 30 12 .97 23 10 .62 2 30 12 .97 22 10 .59 21 28 12 .91 22 10 .59 22 29 12 .94 28 14 1.2 23 1 18 2.0 25 10 .68 24 , 15 1.6 24 9 .58 25 43 51 19 26 13 1.2 26 41 28 3.6 23 10 .62 27 43 '0 .78 21 10 .57 28 42 2.2 30 20 2.0 29 40 39 25 10 .68 30 42 24 32 22 10 .59 31 44 27 '.9 --- --- --- TOTAL 1437 829 104.74 YEAR 25021 22734 I I I I I I 88 RIO GRANDE DE ARECIBO BASIN 50028400 RIO TANAMA AT CHARCO 140NDO, PR LOCATION.--Lat 18°24'52", long 66°42'52", on right bank at abandoned power house at Charco Hondo, 1.5 mi (2.4 km) upstream from mouth, and 4 mi (6 km) south of Arecibo. DRAINAGE AREA.--57.6 i 2 (149.2 km2 ). 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.--Estimated daily discharges: Oct. 7-11, Dec. 3-11, Mar. 11-13, May 16-21, 24, 28-30 and June 7, 8, 10, 11, 15. Records fair except those for estimated daily discharges, which are poor. Diversion 0.8 i (1.3 km) upstream for municipal supply of Arecibo. AVERAGE DISCHARGE.--6 years (1970,1982-86), 102 ft'is (2.889 m'/s), 24.05 in/yr (611 mm/yr), 73,900 acre-ft/yr (91.1 hm'/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 15,000 ft'is (425 m 3/s), May 18, 1985, gage height. 17.95 ft (5.471 ), from floodmark, fro rating curve extended above 1,000 ft'/s (28.3 3/s) on basis of step-backwater analysis; minimum discharge, 21 ft'/s (0.595 m'/s), Apr. 27, 1984. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 2,000 ft'is (56.6 e/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft3/s) (e/s) (ft) (m) Date Time (ft3/s) (e/s) (ft) (m) Oct. 7 unknown *11,700 331 *17.11 5.215 May 1 2000 2,520 71.4 10.82 3.298 Oct. 27 1915 2,340 66.3 10.60 3.231 May 2 1900 2,250 63.7 10.48 3.194 Apr. 30 2115 4,310 122 12.78 3.895 May 14 0215 2,730 77,3 11.09 3.380 Minimum discharge, 22 ft'/s (0.623 '/s), Apr.1. DISCHARGE, IN CUBIC FEET PER SECOND. WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 113 142 90 38 52 38 25 571 155 53 69 97 2 124 128 87 39 51 47 26 740 144 51 48 130 3 69 217 82 36 97 42 66 607 136 49 44 156 4 59 380 80 37 110 39 225 531 115 49 43 193 5 58 485 76 35 72 37 368 512 101 49 75 105 6 554 347 75 35 57 38 161 450 96 49 111 78 7 2500 248 74 35 52 38 101 598 140 48 129 58 8 900 183 71 36 50 35 151 463 160 47 99 52 9 400 149 69 39 48 36 197 371 107 46 70 49 10 250 138 67 51 46 36 204 332 130 46 83 46 11 190 129 66 39 44 35 107 331 125 45 127 44 12 330 128 63 39 43 34 81 289 104 52 64 41 13 332 135 60 36 43 33 65 707 97 44 56 44 14 219 162 57 36 41 34 47 982 85 52 73 41 15 206 362 56 36 40 33 41 467 180 69 55 38 16 173 527 55 38 40 34 42 310 105 72 50 38 17 144 391 54 38 45 33 174 240 89 92 52 38 18 122 273 52 37 43 62 485 225 91 93 49 42 19 117 216 50 36 45 64 227 205 107 56 50 37 20 103 182 48 35 45 46 110 190 82 54 49 36 21 101 177 48 36 41 32 183 180 87 77 45 38 22 111 151 47 38 41 27 127 172 76 52 45 44 23 128 140 45 38 40 27 79 162 71 49 45 47 24 212 131 43 38 39 27 74 190 66 48 52 40 25 158 121 43 38 38 30 81 165 64 53 44 40 26 246 113 42 58 38 28 57 161 64 52 63 42 27 439 108 43 43 36 29 54 183 63 56 45 35 28 379 102 40 40 37 39 72 280 59 54 59 44 29 250 98 40 46 --- 28 109 420 55 51 68 60 30 187 94 40 55 26 498 300 54 68 97 39 31 167 --- 37 73 24 --- 174 --- 78 71 --- TOTAL 9341 6157 1800 1254 1374 1111 4237 11508 3008 1754 2030 1792. MEAN 301 205 58.1 40.5 49.1 35.8 141 371 100 56.6 65.5 59.7 MAX 2500 527 90 73 110 64 498 982 180 93 129 193 MIN 58 94 37 35 36 24 25 161 54 44 43 35 CFSM 5.23 3.56 1.01 .70 .85 .62 2.45 6.44 1.74 .98 1.14 1.04 IN. 6.03 3.98 1.16 .81 .89 .72 2.74 7.43 1.94 1.13 1.31 1.16 AC-FT 18530 12210 3570 2490 2730 2200 8400 22830 5970 3480 4030 3550 CAL YR 1985 TOTAL 40582 MEAN 111 MAX 2500 MIN 34 CFSM 1.93 IN. 26.21 AC-FT 80490 WTR YR 1986 TOTAL 45366 MEAN 124 MAX 2500 MIN 24 CFSM 2.15 IN. 29.30 AC-FT 89980 89 RIO GRANDE DE ARECIBO BASIN 50028400 RIO TANAMA AT CHARCO HONDO, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS MARCH 1983 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA­ DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) NOV, 21 1308 64 256 23.0 JUL, 10 1333 47 257 26.0 DEC, 11 1306 176 267 23.5 AUG, 12 1356 586 257 26.0 JUN, 16 1302 106 185 24.5 SEP, 08 1245 51 273 25.0 90 RIO GRANDE DE ARECIBO BASIN 50029000 RIO GRANDE DE ARECIBO AT CENTRAL CAMBALACHE, PR WATER-QUALITY RECORDS LOCATION.--Tat 18°27'20", long 66'42'10", Hydrologic Unit 21010002, at bridge on unimproved road, about 500 ft (152 m) upstream from Central Cambalache, near Highway 2, 8.3 mi (13.4 km) downstream from Dos Bocas Reservoir, 1.9 mi (3.1 km) downstream from Rio Tanama , and 1.6 mi (2.6 km) southeast cf Arecibo, DRAINAGE AREA.--200 sq mi (520 sq km), approximately. PERIOD OF RECORD.--Water years 1963-66, 1969 to current year. OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1985 28... 1410 18 174 7.80 26.5 110 25 2000 3500 DEC 04... 1040 224 260 7.80 23.0 6.1 -- <10 480 200 FEB 1986 24... 1120 174 250 8.30 23.0 2.2 9.3 109 25 410 810 MAY 8... 1425 2210 230 8.08 25.5 120 8.4 103 18 K1800 K8900 JUL 07... 145 296 7.97 28.0 6.5 8.9 113 <10 -- 07... 1310 145 296 7.97 28.0 6.5 8.9 113 <10 K110 K20 SEP 9... 0940 182 310 8.15 26.5 2.2 7.9 98 13 K950 360 HARD- ALKA- NESS MAGNE- SODIUM ROTAS- LINITY CHLO- HARD- NONCARB CALCIUM SLUM, SODIUM, AD- SIUM, WATER SULFATE RIDE, NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- 01S- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1985 28... 68 2 19 5.0 8.0 0.4 2.4 66 <0.5 11 8.1 DEC 04... 105 FEB 1986 24... 94 MAY 8... 73 1 23 3.8 6.7 0.4 1.9 72 <0.5 8.2 8.0 JUL 07... 129 07... 129 SEP 9... 120 4 39 5.9 9.2 0.4 2.1 118 11 9.4 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/1 (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1985 28... <0.10 18 110 5.5 180 0.770 0.030 0.800 0.050 0.75 DEC 04... 1 0.860 0.040 0.900 0.340 0.46 FEB 1986 24... 2 <0.010 0.500 0.320 0.28 MAY 08... <0.10 16 110 660 130 0.870 0.030 0.900 0.060 0.54 JUL 07... 6 -- 07... 6 <0.010 0.600 0.040 0.16 SEP 09... 0.10 17 160 81 6 <0.010 0.500 0.060 0.24 K = non-ideal count 91 RIO GRANDE DE ARECIBO BASIN 50029000 RIO GRANDE DE ARECIBO AT CENTRAL CAMBALACHE, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO2) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1985 28... 0.80 1.6 7.1 0.240 <1 <100 40 <1 29 80 DEC 04... 0.50 1.4 6.2 0.040 FEB 1986 24... 0.30 0.80 3.5 0.020 -- MAY 08... 0.60 1.5 6.6 0.080 <1 100 60 1 13 40 JUL 07... -- 07... 0.20 0.80 3.5 0.030 SEP 09... 0.30 0.80 3.5 0.030 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1985 28... 11000 44 340 0.10 <1 <1 70 <0.010 <1 0.04 DEC 04... FEB 1986 24... MAY 8... 8000 5 190 0.10 <1 <1 210 <0.010 1 0.05 JUL 07... 07... SEP 9... 93 .206 0 BARCELONETA 207 VEGA BAJA I 0381 MANAfl .208 . 209 VEGA ALTA a a.. • 210 Drainage boundaries indeterminate in limestone terrane 0388 035950 AV CI Limestone a MOROVIS igneous and sedimentary racks Drainage Kra Cibuto basin boundary Droinogs boundary R'o Grand* de Arecibo basin IR ,'o de la Plata basin Pra Island ..44— Canal dr Aceitunas and tunnel to fica Jeccguos tRi'a apatite basin EXPLANATION Rib Inaba% basin A 0350 SURFACE-WATER STATION AND NUMBER V 0307 QUALITY-OF-WATER STATION AND NUMBER *210 WELL AND WELL NUMBER 25 4 5 KILOMETERS 2 5 MILES Figure 14.--Rio Grande de Manati basin. 94 RIO GRANDE DE MANATI BASIN 50030700 RIO OROCOVIS NEAR OROCOVIS, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°14'20", long 66'22'58", at flat low bridge about 300 ft (91 m) northwest of Highway 568, 1.0 mi (1.6 km) north of Orocovis plaza. DRAINAGE AREA.--10.1 sq mi (26.2 sq km). PERIOD OF RECORD.--Water year 1979 to current year. OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1985 17... 1525 30 214 8.20 24.5 5.0 10 20000 6000 DEC 23... 1230 16 255 8.60 24.0 2.2 7.6 95 18 K1500 200 FEB 1986 03... 1635 14 247 8.60 22.5 15 8.8 109 14 K9500 4100 APR 28... 1430 10 327 8.63 25.5 2.2 8.3 106 <10 K590 K1200 JUL 23... 1155 8.1 284 8.65 27.0 2.3 5.8 76 14 380 K100 SEP 03... 1550 6.1 320 8.30 27.5 2.4 7.3 98 <10 3000 860 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- HARD- NONCARB CALCIUM SLUM, SODIUM, AD- SIUM, WATER SULFATE RIDE, NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1985 17... 82 5 19 8.4 10 0.5 1.7 77 <0.5 9.1 12 DEC 23... 92 FEB 1986 03... 96 APR 28... 120 0 30 11 13 0.5 1.8 120 <0.5 9.9 14 JUL 23... 125 SEP 03... 130 13 32 12 14 0.6 2.2 116 11 14 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1985 17... 0.10 30 140 11 8 0.790 0.010 0.800 0.030 0.27 DEC 23... 1 <0.010 0.900 0.020 0.48 FEB 1986 03... 13 0.780 0.020 0.800 0.030 0.47 APR 28... 0.10 30 180 5.2 1 0.890 0.010 0.900 0.040 0.36 JUL 23... 4 <0.010 0.600 <0.010 SEP 03... 0.10 34 190 3.1 1 <0.010 1.00 <0.010 K = non-ideal count 95 RIO GRANDE DE MANATI BASIN 50030700 RIO OROCOVIS NEAR OROCOVIS, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1985 17... 0.30 1.1 4.9 0.110 <1 <100 30 1 6 <10 DEC 23... 0.50 1.4 6.2 0.110 FEB 1986 03... 0.50 1.3 5.8 0.170 APR 28... 0.40 1.3 5.8 0.230 <1 <100 40 <1 12 10 JUL 23... 0.30 0.90 4.0 0.130 SEP 03... 0.50 1.5 6.6 0.160 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE EPABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1985 17... 410 <1 30 <0.10 <1 <1 <10 <0.010 <1 0.06 DEC 23... FEB 1986 03... APR 28... 140 1 20 <0.10 <1 <1 20 <0.010 1 0.06 JUL 23... SEP 03... I I I I I I I I I I 96 RIO GRANDE DE MANATI BASIN 50031200 RIO GRANDE DE MANATI NEAR MOROVIS, PR LOCAT1ON.--Lat 18°17'45', long 66'24'47', Hydrologic Unit 21010001, on right bank 0.1 i (0.2 km) downstream from Quebrada Perchas, 0.8 mi (1.3 km) upstream from Rio Sana Muerto, and 2.2 i (3.5 km) south of Morovis. DRAINAGE AREA.--55.2 mi' (143.0 km'). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--January 1965 to current year. GAGE.--Water-stage recorder and concrete control. Elevation of gage is 440 ft (134 ), fro topographic nap. Feb. 2, 1966 to Apr. 27, 1967, staff gage read twice daily. REMARKS.--Estimated daily discharge: Oct. 6, 7, June 3, 4 and Aug. 29-31. Records fair except those for estimated daily discharges, which are poor. Public water-supply pumpage, about 300 ft (91 ) above the station, influences low-flow discharges. AVERAGE DISCHARGE.--21 years (1966-86), 107 ft'/s (3.030 m'/s), 26.32 in/yr (668 mm/yr), 77,520 acre-ft/yr (95.6 hie/yr); median of yearly mean discharges, 110 ft'/s (3.12 m'/s), 79,700 acre-ft/yr (98 he'/yr). EXTREMES FOR PERIOD OF RECORD.--Maxinu discharge, 48,000 ft'/s (1,359 '/s), May 18, 1985, gage height, 17.89 ft (5.453 ), from floodaarks, from rating curve extended above 200 ft'/s (5.66 'Js) on basis of computations of flow over broad-crested weir and step-backwater analysis; minimum discharges, 4.4 ft'/s (0.125 60/s), Apr. 15, 1984. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 3,500 ft'/s (99.1 '/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (fti/s) (0/s) (ft) (a) Date Time (W/s) (e/s) (ft) (n) Oct. 6 unknown *28,500 807 *13.67 4.167 May 13 0745 15,900 450 10.38 3.164 May 1 1730 4,540 129 5.73 1.747 May 13 2330 18,100 513 11.01 3.356 Minimum discharge, 25 ft'is (0.108 50/s), Mar. 31. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 41 153 110 63 47 33 28 794 101 53 39 182 2 48 131 107 61 53 32 26 387 92 51 38 161 3 37 123 102 59 96 31 88 230 95 51 36 76 4 37 120 102 61 81 31 111 278 100 48 42 52 5 109 115 97 56 171 31 327 280 97 50 40 42 6 6200 103 102 54 81 30 172 174 90 52 35 39 7 3600 101 97 56 61 31 73 225 88 57 35 35 8 554 92 92 56 54 29 339 513 91 49 35 33 9 282 90 90 67 49 31 298 489 88 47 33 31 10 198 91 90 71 46 31 112 403 82 42 33 30 11 163 98 90 57 42 31 77 636 82 43 32 30 12 145 157 88 53 42 29 58 324 81 48 34 29 13 136 207 86 52 41 29 50 2740 85 42 60 29 14 127 326 82 51 41 32 45 1090 80 80 57 29 15 120 832 81 49 41 35 42 360 72 144 36 28 16 111 614 82 52 40 32 61 259 74 94 32 27 17 106 337 79 55 41 29 67 230 69 80 31 27 18 115 328 76 53 41 30 87 212 67 54 29 27 19 106 205 78 47 39 30 79 190 64 48 26 27 20 102 203 76 46 49 31 110 167 63 44 26 26 21 97 307 75 44 45 28 173 156 58 44 27 27 22 93 194 76 43 39 27 130 153 56 42 27 28 23 117 159 73 44 38 26 72 160 56 43 32 28 24 304 147 73 49 36 30 59 137 53 42 129 30 25 223 138 69 119 35 33 52 128 53 43 112 33 26 210 123 70 160 33 29 47 131 52 41 43 33 27 299 120 66 63 33 29 46 126 54 42 33 43 28 317 115 68 51 32 28 48 216 52 42 147 63 29 219 112 65 47 --- 29 219 161 53 40 300 33 30 166 112 63 46 32 653 118 53 40 150 30 31 204 --- 62 45 27 --- 107 --- 48 70 --- TOTAL 14586 5953 2567 1830 1447 936 3749 11574 2201 1644 1799 1308 MEAN 471 198 82.8 59.0 51.7 30.2 125 373 73.4 53.0 58.0 43.6 MAX 6200 832 110 160 171 35 653 2740 101 144 300 182 MIN 37 90 62 43 32 26 26 107 52 40 26 26 CFSM 8.53 3.59 1.50 1.07 .94 .55 2.26 6.76 1.33 .96 1.05 .79 IN. 9.83 4.01 1.73 1.23 .98 .63 2.53 7.80 1.48 1.11 1.21 .88 AC-FT 28930 11810 5090 3630 2870 1860 7440 22960 4370 3260 3570 2590 CAL YR 1985 TOTAL 64935 MEAN 178 MAX 17100 MIN 19 CFSM 3.22 IN. 43.76 AC-FT 128800 WTR YR 1986 TOTAL 49594 MEAN 136 MAX 6200 MIN 26 CFSM 2.46 IN. 33.42 AC-FT 98370 RIO GRANDE DE MANATI BASIN 50031200 RIO GRANDE DE MANATI NEAR MOROVIS, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORD.--Water years 1968 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1985 17... 1210 101 238 8.00 26.5 5.0 <10 K170 56 DEC 12... 1415 87 275 7.30 24.0 1.1 7.6 91 <10 2900 96 FEB 1986 03... 1315 109 251 8.50 21.5 22 8.8 103 20 K11000 2700 APR 15... 1355 43 286 8.22 30.0 3.5 7.3 98 18 K82 K180 JUL 14... 1430 47 244 8.20 28.0 2.5 8.2 106 21 460 82 SEP 03... 1215 77 237 8.06 28.0 43 7.7 100 <10 2800 K800 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- HARD- NONCARS CALCIUM SIUM, SODIUM, AD- SLUM, WATER SULFATE RIDE, NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (AGA TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CACC3) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1985 17... 90 4 21 9.2 11 0.5 2.3 86 <0.5 9.9 13 DEC 12... 82 FEB 1986 03... 96 APR 15... 99 3 23 10 11 0.5 2.3 96 <0.5 11 17 JUL 14... 99 SEP 03... 85 11 20 8.6 11 0.5 2.8 74 12 12 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) 5102) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1985 17... 0.10 26 140 39 13 0.890 0.010 0.900 0.030 0.27 DEC 12... 1 <0.010 0.900 0.020 0.28 FEB 1986 03... 40 0.690 0.010 0.700 0.040 0.56 APR 15... 0.10 26 160 18 6 <0.010 0.700 0.020 0.38 JUL 14... 6 <0.010 0.200 0.010 0.29 SEP 03... 0.10 25 140 28 48 0.980 0.020 1.00 0.040 0.36 K = non-ideal count 97 RIO GRANDE DE MANATI BASIN 50031200 RIO GRANDE DE MANATI NEAR MOROVIS, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PROS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1985 17... 0.30 1.2 5.3 0.040 <1 <100 40 1 5 10 DEC 12... 0.30 1.2 5.3 0.050 FEB 1986 03... 0.60 1.3 5.8 0.080 APR 15... 0.40 1.1 4.9 0.050 <1 <100 60 1 11 60 JUL 14... 0.30 0.50 2.2 0.030 SEP 03... 0.40 1.4 6.2 0.090 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L; (MG/L) OCT 1985 17... 260 1 30 <0.10 <1 <1 30 <0.010 3 0.05 DEC 12... FEB 1986 03... APR 15... 480 1 30 <0.10 <1 <1 30 <0.010 3 0.04 JUL 14... -- SEP 03... 98 I I I I I I 99 RIO GRANDE DE MANATI BASIN 50035000 RIO GRANDE DE MANATI AT CIALES, PR LOCATION.--Lat 18°19'26", lung 66°27'36", Hydrologic Unit 21010001, on left bank, 1.6 mi (2.6 km) upstream from Hwy 145 bridge, 0.8 mi (1.3 km) downstream from Quebrada Saliente, 0.9 mi (1.4 km) upstream from Quebrada Cojo Vales, and 1.2 mi (1.9 km) southeast of Ciales. DRAINAGE AREA.--128 mi' (332 km,), excludes 6.0 mi' (15.5 km 2), the runoff from which is diverted through El Guineo and de Matrullas reservoirs. WATER-DISCHARGE RECORDS PERIOD OF RECORD.--September 1946 to September 1953, May 1956 to December 1957 (unpublished, available in files of Caribbean District Office and in the National Water Data Storage and Retrieval System, Washington, D.C.); February 1959 to Saptember 1960 (monthly discharge measurements only); October 1960 to current year. Equivalent record from .; -mar, 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 mil (342 km 2 ). GAGE.--Water-si.,:ge recorder. Elevation of gage is 140 ft (43 m), fro topographic map. Prior to Apr. 1, 1962 , staff gage, read twice daily, at site 100 ft (30 ) upstream at same datum. January 1971 to December 1972 at site 1.6 mi (2.6 km) downstream at different datum. REMARKS.--Estimated daily discharges: May 1. Records fair except those for estimated daily discharges, which are poor. AVERAGE DISCHARGE.--26 years (1961-86), 268 ft'is (7.590 m'/s), 28.43 in/yr (722 m/yr), 194,200 acre-ft/yr (239 hm'/yr); median of yearly mean discharges, 260 ft'is (7.36 m 3/s), 188,000 acre-ft/yr (230 he/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 125,000 Wis. (3,540 m'/s), Oct. 9, 1970, gage height, 24.0 ft (7.32 m), from floodmark, from rating curve extended above 3,000 ft'/s (85.0 10/s) on basis of slope-area measurements of peak flow at gage heights 13.2 ft (4.02 m), 15.0 ft (4.57 ), 19.0 ft (5.79 ), and 24.0 ft (7.:a m), datum then in use; minimum discharge, 20 ft'A (0.566 m'/s), Apr. 20, 21, 1984. EXTREMES OUTSIDE PERIOD OF RECORD.--Approximate gage heights of major floods, pointed out by local residents are as follows: August 1899, 50 ft (15.2 m), September 1928, 36 ft (11.0 m), and September 1932, 34 ft (10.4 m) at site 1.6 mi (2.6 km) upstream. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 7,000 ft'is (198 '/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft7s) (e/s) (ft) (m) Date Time (ft'/s) (e/s) (ft) (m) Oct. 7 0115 *75,400 2,135 *19.75 6.020 May 13 0830 45,400 1,286 15.64 4.767 Apr. 30 1700 10,400 294 7.93 2.417 May 13 2230 53,900 1,526 16.92 5.157 May 1 1800 8,390 238 7.18 2.188 Minimum discharge, 47 ft'is (1.33 10/s), Mar. 28, 29, 31, Apr. 1-3. 100 RIO GRANDE DE MANATI BASIN 50035000 RIO GRANDE DE MANATI AT CIALES, PR--Continued DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 141 375 261 134 100 72 47 2450 268 108 87 503 2 173 335 253 131 114 70 47 1670 221 107 80 339 3 121 315 241 125 280 69 196 637 208 106 76 168 4 107 315 239 124 214 68 263 564 193 104 81 131 5 204 286 234 122 359 69 1050 1180 178 107 83 97 6 6590 388 245 120 185 68 501 550 171 122 74 87 7 26500 353 233 120 136 67 165 568 183 139 72 79 8 2670 271 221 117 120 66 1050 1390 203 113 73 75 9 1020 244 218 130 108 65 958 1740 187 105 73 73 10 616 231 210 148 102 65 241 1100 162 99 69 70 11 485 233 206 120 95 66 165 2130 189 99 65 68 12 421 364 205 114 95 66 124 746 165 103 63 68 13 377 496 201 111 92 64 108 12500 158 96 79 67 14 340 1220 194 106 90 65 97 4740 151 169 106 67 15 329 3850 191 102 87 69 89 937 142 369 80 63 16 295 3010 189 102 87 66 108 561 146 244 72 62 17 282 1380 182 102 87 60 247 490 137 174 67 60 18 290 1510 176 106 91 64 223 467 135 125 63 60 19 275 684 174 98 86 65 198 371 133 102 60 58 20 261 550 171 92 98 64 360 323 130 100 59 58 21 248 784 166 91 104 58 360 301 127 97 58 60 22 225 490 162 91 87 52 242 287 122 92 57 65 23 325 400 159 92 83 50 144 264 121 88 58 65 24 758 357 154 93 80 52 134 249 118 192 165 62 25 535 340 150 220 77 58 127 242 115 159 190 75 26 1480 311 149 343 76 55 106 265 11.4 113 81 68 27 1230 295 145 126 73 51 95 237 116 89 68 69 28 1020 282 141 104 72 49 97 428 110 92 308 92 29 703 274 140 96 --- 51 499 418 109 98 514 71 30 472 267 136 93 61 2340 322 108 95 236 66 31 488 --- 134 119 51 --- 300 --- 99 165 --- TOTAL 48981 20210 5880 3792 3278 1916 10381 38427 4620 3905 3382 2946 MEAN 1580 674 190 122 117 61.8 346 1240 154 126 109 98.2 MAX 26500 3850 261 343 359 72 2340 12500 268 369 514 503 MIN 107 231 134 91 72 49 47 237 108 88 57 58 CFSM 12.3 5.27 1.48 .95 .91 .48 2.70 9.69 1.20 .98 .85 .77 IN. 14.24 5.87 1.71 1.10 .95 .56 3.02 11.17 1.34 1.13 .98 .86 AC-FT 97150 40090 11660 7520 6500 3800 20590 76220 9160 7750 6710 5840 CAL YR 1985 TOTAL 180518 MEAN 495 MAX 42700 MIN 45 CFSM 3.87 IN. 52.41, AC-FT 358100 WTR YR 1986 TOTAL 147718 MEAN 405 MAX 26500 MIN 47 CFSM 3.16 IN. 42.93 AC-FT 293000 WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS 1979 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA­ DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) DEC, 13 1056 199 234 23.0 JUL, 11 1022 89 241 28.0 MAY, 27 0955 234 205 25.5 AUG, 13 1039 67 236 27.5 JUN, 13 1047 160 222 22.3 SEP, 05 1017 98 218 28.0 101 RIO GRANDE DE MANATI BASIN 50035500 RIO GRANDE DE MANATI AT HIGHWAY 149 AT CIALES, RP WATER-QUALITY RECORDS LOCATION.--Lat 18'20'46", long 66°28'06", at bridge on Highway 149, about 800 ft (244 m) upstream from confluence with Rio Cialitos, 0.5 mi (0.8 km) north of Ciales plaza. DRAINAGE AREA.--136 sq mi (352 sq km) this excludes the 6 sq mi (15.5 sq km) upstream from Lago El Guineo and Lago de Matrullas, flow from which is diverted to Rio Jacaguas. PERIOD OF RECORD.--Water years 1979 to current year. OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE 1i1E TANEOUS ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1985 10... 1350 852 146 7.70 29.5 3.4 7.8 104 11 720 5500 DEC 24... 1000 164 239 8.30 23.0 2.4 8.6 100 <10 K180 K100 FEB 1986 26... 1130 60 255 8.20 23.0 2.0 9.6 112 <10 APR 23... 1425 143 210 8.00 26.5 59 8.5 107 17 3400 K1400 JUL 17... 1010 203 207 7.75 27.0 15 8.3 105 10 2100 K12000 SEP 18... 1115 70 249 8.00 28.5 6.2 8.5 110 24 K20 K30 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- HARD- NONCARB CALCIUM SLUM, SODIUM, AD- SIUM, WATER SULFATE RIDE, NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS 5) AS SO4) AS CL) OCT 1985 10... 53 5 13 5.0 8.0 0.5 2.2 48 <0.5 8.9 9.3 DEC 24... 82 FEB 1986 26... 93 APR 23... 77 7 19 7.2 10 0.5 2.0 70 <0.5 11 11 JUL. 17... 72 SEP 18... 96 0 23 9.4 13 0.6 2.1 98 10 14 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1985 10... 0.10 21 96 221 30 0.780 0.020 0.800 0.050 0.35 DEC 24... 2 0.700 0.010 0.710 0.030 0.37 FEB 1986 26... 1 0.290 0.010 0.300 0.040 0.26 APR 23... 0.10 23 130 48 49 0.780 0.020 0.800 0.060 0.34 JUL 17... 21 0.690 0.010 0.700 0.040 0.26 SEP 18... 0.20 27 160 30 3 <0.010 0.200 0.040 0.36 K = non-ideal count RIO GRANDE DE MANATI BASIN 50035500 RIO GRANDE DE MANATI AT HIGHWAY 149 AT CIALES, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- PECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1985 10... 0.40 1.2 5.3 0.070 <1 <100 40 2 12 40 DEC 24... 0.40 1.1 4.9 0.060 - FEB 1986 26... 0.30 0.60 2.7 0.050 - APR 23... 0.40 1.2 5.3 0.100 <1 100 <10 <1 22 10 JUL 17... 0.30 1.0 4.4 0.070 SEP 18... 0.40 0.60 2.7 0.090 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1985 10... 2700 29 80 <0.10 <1 <1 280 <0.010 3 0.05 DEC 24... FEB 1986 26... APR 23... 3800 <1 100 <0.10 <1 <1 10 <0.010 <1 0.02 JUL 17... SEP 18... 102 103 RIO GRANDE DE MANATI BASIN 50035950 RIO CIALITOS AT HIGHWAY 649 AT CIALES, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°20'18", long 66°28'28", 100 ft (30 m) upstream from bridge on Highway 649, 0.1 mi (1.1 km) upstream from mouth, and about 0.4 mi (0.6 km) west of Ciales plaza. DRAINAGE AREA.--17.0 sq mi (44.0 sq km). PERIOD OF RECORD.--Water years 1969-71, 1974 to current year. OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.1 KF AGAR INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1985 10... 1700 52 188 8.00 28.0 9.0 7.8 101 <10 1000 K1900 DEC 23... 1545 70 229 8.60 23.0 1.1 8.6 100 <10 470 270 FEB 1986 26... 1315 14 229 8.70 23.0 1.4 9.2 107 12 APR 23... 1105 23 224 8.20 24.5 7.2 9.0 109 <10 K1000 650 JUL 17... 1220 37 212 8.05 27.0 12 8.5 108 <10 2000 K110000 SEP 18... 1315 11 244 8.25 28.0 3.0 8.8 114 22 240 360 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- HARD- NONCARB CALCIUM SIUM, SODIUM, AD- SIUM, WATER SULFATE RIDE, NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1985 10... 67 0 18 5.4 11 0.6 2.2 67 <0.5 9.5 12 DEC 23... 79 FEB 1986 26... 90 APR 23... 88 6 26 5.7 9.9 0.5 1.7 82 <0.5 9.2 9.2 JUL 17... 86 SEP 18... 100 0 30 6.9 11 0.5 1.6 105 6.6 13 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2fNO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1985 10... 0.10 26 120 17 45 1.29 0.010 1.30 0.040 0.36 DEC 23... 4 <0.010 0.900 0.020 0.28 FEB 1986 26... 1 <0.010 0.500 0.020 0.28 APR 23... 0.10 25 140 8.4 12 <0.010 0.700 0.030 0.37 JUL 17... 19 <0.010 0.900 0.040 0.46 SEP 18... 0.10 31 160 5.0 12 <0.010 0.500 0.030 0.27 K = non-ideal count RIO GRANDE DE MANATI BASIN 50035950 RIO CIALITOS AT HIGHWAY 649 AT CIALES, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG,1 (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS 8) AS CD) AS CR) AS CU) OCT 1985 10... 0.40 1.1 7.5 0.090 <1 100 30 1 8 20 DEC 23... 0.30 1.2 5.3 0.070 FEB 1986 26... 0.30 0.80 3.5 0.060 APR 23... 0.40 1.1 4.9 0.070 1 100 20 <1 11 <10 JUL 17... 0.50 1.4 6.2 0.080 SEP 18... 0.30 0.80 3.5 0.090 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1985 10... 2200 4 200 <0.10 <1 <1 160 <0.010 2 0.05 DEC 23... FEB 1986 26... APR 23... 720 <1 40 <0.10 <1 <1 10 <0.010 1 0.02 JUL 17... SEP 18... 104 I I I I I 105 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 mil (510 km,), approximately, of which about 38 mi' (98 km') is partly or entirely noncontributing, excludes 6.0 it (15.5 kmt) 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. GAGE.--Water-stage recorder. Elevation of gage is 14 ft (4 m), from topographic map. Prior to 1968 crest-stage gage at same site ard datum 3.57 ft (1.088 ) lower. REMARKS.--Estimated daily discharges: Dec. 25-30. Records fair except those for estimated daily discharges. which are poor. AVERAGE DISCHARGE.--16 years (1971-86), 397 ft3/s (11.24 3/s), 27.36 in/yr (695 mm/yr), 287,600 acre-ft/yr (355 hm 3/yr); median of yearly mean discharges, 370 ft3/s (10.5 0/s), 269,000 acre-ft/yr (330 hm 3/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 97,200 ft3/s (2,750 0/s), Oct. 7, 1985, gage height, 33.79 ft (10.299 m) from rating curve extended above 15,000 ft3/s (425 m 3/s) on basis of slope-area measurements of peak flow; minimum discharge, 33 ft3/s (0.935 0/s), May 12, 1984. EXTREMES OUTSIDE PERIOD OF RECORD.--Approximate gage heights to gage datum of major floods, pointed out by local residents, are as follows: Sept. 13. 1928, 36.6 ft (11.16 ), Sept. 27, 1932, 36.3 ft (11.06 m), and Aug. 4, 1945, 34.3 ft (10.45 m). EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 9,000 ft3/s (255 3/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft3/s) (m 3/s) (ft) (m) Date Time (ft3/s) (0/s) (ft) (m) Oct. 7 0515 *97,200 2,750 *33.79 10.299 May 2 2115 16,100 456 29.02 8.845 Nov. 15 0400 9,260 262 27.68 8.437 May 13 1145 40,100 1,140 31.57 9.622 Nov. 16 0045 9,340 264 27.72 8.449 May 14 0115 71,500 2,020 32.97 10.049 Apr. 30 2245 11,500 326 28.30 8.626 Minimum discharge, 88 ft3/s (2.492 0/s), Mar. 23, 24. REVISIONS.--The peak discharges and annual maximum (*) reported for some water years have been revised as shown in the following table. They supersede figures published in the reports for 1970, 1971, 1975-76, 1979-80, 1981-82, 1983, 1984 and 1985. Water Discharge Gage height Water Discharge Gage height Year Date (ft3/s) (m 3/s) (ft) (m) Year Date (ft3/s) (0/s) (ft) (m) 1970 Nov. 9, 1969 *68,100 1,930 32.85 10.013 Sept.13, 1982 21,200 600 29.96 9.132 1971 Oct. 9, 1970 *81,800 2,360 33.30 10.150 1983 Apr. 21, 1983 *30,200 855 30.84 9.400 1975 Oct. 23, 1974 21,000 595 29.92 9.120 May 14, 1983 18,700 530 29.52 8.998 Sept.16, 1975 *21,400 606 29.99 9.141 1984 Sept.11, 1984 8,600 244 27.36 8.339 1979 July 19, 1979 19,000 538 29.57 9.013 1985 Nov. 3, 1984 17,300 490 29.26 8.918 Aug. 31. 1979 *34,500 977 31.18 9.504 May 17, 1985 37,300 1,060 31.38 9.565 1982 Dec. 13, 1981 *31,000 878 30.91 9.421 May 18, 1985 *90,000 2,550 33.54 10.223 106 RIO GRANDE DE MANATI BASIN 50038100 RIO GRANDE DE MANATI AT HIGHWAY 2 NEAR MANATI, PR--Continued DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 2 3 4 5 201 286 201 169 259 585 515 529 675 616 393 372 347 335 324 181 178 175 177 173 165 165 358 339 476 111 110 108 109 107 99 99 151 547 1360 3700 4640 2840 1300 2310 434 354 327 304 290 157 155 154 151 147 186 168 158 158 163 463 739 327 296 193 6 7 8 9 10 3040 48600 7170 1950 1190 576 675 476 417 396 340 314 298 291 284 171 170 164 181 210 283 197 169 154 144 105 103 103 102 104 1070 387 741 2300 482 1610 1140 1760 3070 2010 276 266 382 350 288 160 186 220 158 151 152 147 145 148 142 164 147 138 138 139 11 12 13 14 15 928 795 653 557 509 399 504 854 1240 7140 285 281 274 258 254 172 160 157 150 145 139 133 130 127 126 105 103 101 104 110 325 233 186 159 143 2930 1490 13300 21100 2340 293 274 262 254 236 150 153 140 134 438 139 138 169 203 166 135 132 133 130 125 16 17 18 19 20 447 414 414 407 370 6510 2530 2090 1150 894 252 247 239 231 229 151 167 173 143 144 126 123 129 121 122 108 99 103 102 103 140 287 284 339 248 1340 1040 994 772 652 235 218 209 206 201 466 271 210 169 154 152 146 136 131 130 120 118 117 115 112 21 22 23 24 25 363 329 314 984 850 1090 818 676 596 549 222 220 215 208 204 153 155 152 148 165 150 127 115 111 114 99 93 90 92 106 711 452 333 266 228 583 540 494 470 448 194 188 185 181 175 146 137 133 135 362 128 128 130 191 313 111 115 121 116 119 26 27 28 29 30 31 1540 2560 1190 1220 712 720 512 473 445 425 413 --- 200 195 191 185 182 181 562 233 178 162 154 180 115 113 111 --- 102 99 96 107 125 104 176 155 155 433 2610 --- 449 477 575 807 582 433 171 173 169 162 157 --- 206 179 179 201 279 205 186 149 464 720 519 311 123 114 129 124 112 --- TOTAL MEAN MAX MIN CFSM IN. AC-FT 79342 2559 48600 169 13.0 14.98 157400 34768 1159 7140 396 5.88 6.57 68960 8051 260 393 181 1.32 1.52 15970 5584 180 562 143 .91 1.05 11080 4682 167 476 111 .85 .88 9290 3213 104 125 90 .53 .61 6370 15099 503 2610 99 2.55 2.85 29950 76196 2458 21100 433 12.5 14.39 151100 7414 247 434 157 1.25 1.40 14710 6086 196 466 133 .99 1.15 12070 6316 204 720 128 1.04 1.19 12530 5165 172 739 111 .87 .98 10240 CAL YR 1985 WTR YR 1986 TOTAL TOTAL 272646 251916 MEAN MEAN 747 690 MAX MAX 55900 48600 MIN MIN 80 90 CFSM CFSM 3.79 3.50 IN, IN. 51.48 47.57 AC-FT AC-FT 540800 499700 107 RIO GRANDE DE MANATI BASIN 50038100 RIO GRANDE DE MANATI AT HIGHWAY 2 NEAR MANATI, PR--Continued (National stream-quality accounting network station) WATER-QUALITY RECORDS PERIOD OF RECORD.--Water years 1969 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TTlE TANEOUS ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1985 11... 1215 1020 205 8.10 26.5 100 8.3 103 70000 DEC 04... 1445 334 247 7.80 25.5 48 <10 3800 3700 FEB 1986 6... 1135 279 247 7.85 22.5 35 8.1 94 22 K7400 3000 APR 02... 1350 97 320 7.80 27.0 1.7 9.5 88 28 2000 K730 JUN 05... 1055 293 312 7.69 27.0 6.5 7.2 90 13 K10000 600 AUG 29... 1030 520 219 7.67 27.0 89 6.4 80 14 K12000 K14000 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- FLUO- HARD- NONCARB CALCIUM SLUM, SODIUM, AD- SLUM, WATER SULFATE RIDE, RIDE, NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL DIS- DIS- DIS- (MG/L TOT FLO SOLVED SOLVED SOLVED TION SOLVED FIELD SOLVED SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS 504) AS CL) AS F) OCT 1985 11... 8d 10 26 5.5 8.5 0.4 1.7 8.9 9.2 <0.10 DEC 04... 120 4 35 7.6 11 0.5 2.0 115 9.3 13 0.10 FEB 1986 06... 100 6 28 7,3 9.0 0.4 1.9 94 9.5 11 0.20 APR 02... 130 17 41 7.9 11 0.4 2.3 118 10 13 0.20 JUN 05... 130 1 41 7.7 11 0.4 2.2 133 8.8 13 0.20 AUG 29... 91 6 27 5.7 10 0.5 2.7 88 9.1 9.3 0.10 SOLIDS, SOLIDS, SOLIDS, NITRO- NITRO- NITRO- NITRO- SILICA RESIDUE SUM OF SOLIDS, RESIDUE GEN, GEN, GEN, GEN,AM- DIS- AT 180 CONSTI- DIS- AT 105 NO2+NO3 AMMONIA AMMONIA MONIA + PHOS- PHOS- SOLVED DEG. C TUENTS, SOLVED DEG. C, DIS- DIS- DIS- ORGANIC PHORUS, PHORUS (MG/L DIS- DIS- (TONS SUS- SOLVED SOLVED SOLVED TOTAL TOTAL TOTAL DATE AS SOLVED SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L SI02) (MG/L) (MG/L) DAY) (MG/L) AS N) AS N) AS NH4) AS N) AS P) AS PO4) OCT 1985 11... 19 - 132 130 362 0.800 0.080 0.10 0.40 0.260 0.80 DEC 04... 22 162 170 146 19 0.780 0.070 0.09 0.50 0.080 0.25 FEB 1986 06... 21 149 150 112 24 0.980 0.090 0.12 0.80 0.110 0.34 APR 02... 17 206 170 54 12 0.590 0.030 0.04 0.40 0.140 0.43 JUN 5... 20 184 180 146 28 0.650 0.060 0.08 0.30 0.110 0.34 AUG 29... 18 164 130 230 62 0.880 0.200 0.26 0.50 0.170 0.52 K = non-ideal count RIO GRANDE DE MANATI BASIN 50038100 RIO GRANDE DE MANATI AT HIGHWAY 2 NEAR MANATI, PR--Continued (National stream-quality accounting network station) WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 PROS- PHDS- PHOS- PHORUS, PRATE, ALUM- BERYL- CHRO- PHORUS, ORTHO, ORTHO, INUM, ARSENIC BARIUM, LIUM, CADMIUM MIUM, COBALT, COPPER, DIS- DIS- DIS- DIS- DIS- DIS- D1S- D1S- DIS- DIS- DIS- SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED DATE (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS P) AS P) AS PO4) AS AL) AS AS) AS BA) AS BE) AS CD) AS CR) AS CO) AS CU) OCT 1985 11... 0.040 0.030 0.09 40 <1 47 <0.5 <1 <1 <3 7 DEC 4... 0.050 0.050 0.15 FEB 1986 06... 0.090 0.090 0.28 70 1 44 ,0.5 <1 <1 <3 3 APR 02... 0.090 0.090 0.28 - JUN 5... 0.040 0.040 0.12 10 <1 51 <0.5 <1 <1 <3 3 AUG 29... 0.110 0.070 0.21 80 1 39 <0.5 2 <1 <3 11 MANGA- MOLYB- SELE- STROM- VANA- IRON, LEAD, LITHIUM NESE, MERCURY DENUM, NICKEL, NIUM, SILVER, TIUM, DIUM, DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS FE) AS PB) AS LI) AS MN) AS HG) AS MO) AS NI) AS SE) AS AG) AS SR) AS V) OCT 1985 11... 29 <1 <4 41 <0.1 <10 2 <1 <1 120 <6 DEC 4... - FEB 1986 6... 72 <1 <4 16 4.1 <10 7 <1 <1 150 <6 APR 02... JUN 5... 9 <1 <4 44 0.5 <10 <1 <1 <1 170 <6 AUG 29... 130 <5 8 26 2.5 <10 4 <1 <1 140 <6 PESTICIDE ANALYSES CHLOR- DI- DI- PCB, ALDRIN, DANE, DDD, DOE, DDT, AZINON, ELDRIN DATE 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) JUN 1986 05... 1055 <0.1 <0.010 <0.1 <0.010 <0.010 <0.010 <0.01 <0.010 HEPTA- METH- ENDO- HEPTA- CHLOR MALA- OXY- SULFAN, ENDRIN, ETHION, CHLOR, EPDXIDE LINDANE THION, CHLOR, DATE TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN 1986 05... <0.010 <0.010 <0.01 <0.010 <0.010 <0.010 <0.01 <0.01 NAPH- THA- METHYL METHYL LENES, PARA- TRI- PARA- POLY- PER- TOX- TOTAL THION, THION, MIREX, THION, CHLOR. THANE APHENE, IRI- DATE TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL THION (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN 1986 05... <0.01 <0.01 <0.01 <0.01 <0.10 <0.1 <1 ,0.01 108 109 RIO GRANDE DE MANATI BASIN 50038100 RIO GRANDE DE MANATI AT HIGHWAY 2 NEAR MANATI, PR--Continued (National stream-quality accounting network station) WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT SED. SEDI- SUSP. MENT, SIEVE STREAM- SEDI- DIS- DIAM. FLOW, MENT, CHARGE, PERCENT INSTAN- SUS- SUS- FINER DATE TIME TANEOUS PENDED PENDED THAN (CFS) (MG/L) (T/DAY) .062 MM DEC 1985 04... 1445 400 60 65 82 FEB 1986 06... 1135 304 128 105 83 JUN 05... 1055 329 100 89 89 AUG 29... 1100 478 235 303 65 110 LAGUNA TORTUGUERO BASIN 50038200 LAGUNA TORTUGUERO OUTLET NEAR VEGA RAJA, PR WATER-QUALITY RECORDS LOCATION.--Lat 18'28'29", long 66°26'50", at bridge on Highway 686, 4.2 mi (6.8 km) northeast of Manati, and 4.4 mi (7.1 km) northwest of Vega Baja plaza. DRAINAGE AREA.--Indeterminate. PERIOD OF RECORD.--Water years 1964-66, 1969-71, 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (MG/L) ATION) (MG/L) 100 ML) 100 ML) NOV 1985 01... 1145 37 1300 7.80 28.5 52 43 K27 DEC 18... 0950 33 1140 8.10 26.0 <10 K7 K20 FEB 1986 06... 1645 25 1250 8.20 27.5 8.7 111 36 K31 K990 APR 22... 1005 24 1610 8.01 29.0 8.0 105 39 K15 K120 JUL 1... 1405 22 1110 8.20 30.5 7.3 97 25 K6 K10 SEP 2... 1515 27 1350 7.85 30.5 8.3 112 30 K8 68 ALKA- SOLIDS, NITRO- LINITY RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- GEN,AM- WATER AT 105 GEN, GEN, GEN, GEN, GEN, MONIA + NITRO- TOTAL SULFIDE DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC )RGANIC GEN, FIELD TOTAL SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL DATE MG/L AS (MG/L PENDED (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L CAC03 AS S) (MG/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) NOV 1985 01... 139 <0.5 14 0.880 0.020 0.900 0.420 0.68 1.1 2.0 DEC 18... 157 4 1.27 0.030 1.30 0.310 0.69 1.0 2.3 FEB 1986 06... 142 9 0.880 0.020 0.900 0.210 0.69 0.90 1.8 APR 22... 115 <0.5 2 0.870 0.030 0.900 0.120 0.68 0.80 1.7 JUL 1... 119 4 0.680 0.020 0.700 0.130 0.77 0.90 1.6 SEP 2... 116 2 0.580 0.020 0.600 0.180 0.92 1.1 1.7 MANGA- METHY- BORON, COPPER, IRON, NESE, ZINC, LENE NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL BLUE GEN, PHORUS, RECOV- RECOV- RECOV- RECOV- RECOV- CYANIDE ACTIVE TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE TOTAL PHENOLS SUB- DATE (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS NO3) AS P) AS B) AS CU) AS FE) AS MN) AS ZN) AS CN) (UG/L) (MG/L) NOV 1985 01... 8.9 0.010 70 10 160 20 50 <0.010 8 0.11 DEC 18... 10 0.020 FEB 1986 06... 8.0 0.010 APR 22... 7.5 <0.010 90 <10 140 10 60 <0.010 2 0.13 JUL 1... 7.1 0.010 -- SEP 2... 7.5 <0.010 K = non-ideal count 111 82 039750 Loguno Tor 0395. 0397 y039650 DORADO . VEGA BAJA TOA BAJA • 70 a MAN AT a 212 QGA ALTA .213 Drainage boundaries indeterminate in limestone terrane TOA ALTA a Limestone Igneous and sedimentary rocks CIALES a aNARANJITO Grande de Moriati'besoi Drainage boundary Plot0 balin EXPLANATION A 038320 SURFACE-WATER STATION AND NUMBER V 0397 QUALITY-OF-WATER STATION AND NUMBER 0213 WELL AND WELL NUMBER v- Mop aria 0 1 2 3 4 5 KILOMETERS i l 0 i 2 3 4 5 MILES Figure 15.--Rio Cibuco basin. 112 RIO CIBUCO BASIN 50038320 RIO CIBUCO BELOW COROZAL, PR LOCATION.--Lat 18°21'13", long 66°20'07", Hydrologic Unit 21010001, on right bank, 150 ft (46 m) downstream from Rio Corozal, and 1.4 mi (2.3 km) northwest of Corozal. DRAINAGE AREA.--15.1 EP (39.1 km 2 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--May 1969 to current year. GAGE.--Water-stage recorder. Elevation of gage is 195 ft (59 m), from topographic map. REMARKS.--Estimated daily discharges: Oct. 8, 9 and May 12-15. Records fair except those for estimated daily discharges, which are poor. AVERAGE DISCHARGE.--17 years (1970-86). 29.6 ft'/s (0.838 80/s), 26.62 in/yr (676 mm/yr). 21,440 acre-ft/yr (26.4 he/yr); median of yearly mean discharges, 32 ft'is (0.91 m 3/s), 23,200 acre-ft/yr (29 hm,/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 13,600 ft'/s (385 m 3 /s). Nov. 7, 1979, gage height, 19.80 ft (6.035 m), from rating curve extended above 100 ft'is (2.83 m'is) on basis of float and slope-area measurements of peak flow; minimum daily discharge, 1.3 ft'is (0.037 e/s), July 24-26, 1977. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 2,500 ft'/s (70.8 10/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) ($1 3/s) (ft) (a) Date Time (ft0/s) (m'/s) (ft) (m) Oct. 6 1645 3,130 88.6 11.65 3.551 Nay 1 1730 4,330 123 13.09 3.990 Oct. 7 0045 4,310 122 13.07 3.984 May 9 1700 8,530 242 16.92 5.157 Nov. 15 1800 2,730 77.3 11.11 3.386 May 13 0700 9,680 274 17.78 5.419 Apr. 8 1445 3,560 101 12.19 3.716 May 13 2230 *11,000 312 *18.71 5.703 Apr. 30 1400 3,290 93.2 11.85 3.612 Minimum discharge, 4.6 ft'is (0.130 m'/s), Apr. 2. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 2 3 4 5 29 22 18 33 66 30 27 37 80 37 35 34 34 34 35 17 17 19 18 15 12 16 21 26 26 9.7 8.1 8.5 8.9 8.3 6.5 5.7 24 78 205 481 109 90 253 94 30 28 27 25 23 14 13 15 13 15 9.6 8.4 8.9 8.4 9.4 157 53 30 22 19 6 7 8 9 10 529 1210 110 60 44 30 27 25 24 24 31 30 29 29 28 14 14 13 34 19 15 13 12 11 11 7.5 7.2 7.4 7.5 7.8 37 20 250 60 29 65 111 122 544 102 22 21 20 20 20 18 13 13 11 11 7.7 8.3 7.7 6.7 6.1 17 14 13 12 12 11 12 13 14 15 38 33 30 31 29 31 118 93 301 752 28 28 26 24 25 14 12 13 12 12 12 11 11 11 11 7.8 7.1 7.5 8.6 7.5 23 14 12 11 9 0 83 49 1640 380 100 19 26 22 19 20 17 13 10 14 73 7.8 6.8 23 15 10 12 12 12 11 9.9 16 17 18 19 20 24 22 52 39 66 216 124 80 64 73 25 25 23 23 22 13 14 13 12 12 11 11 11 11 13 6.5 6.7 6.5 7.2 7.1 8.9 8.8 9.0 8.5 22 56 46 49 37 32 20 18 17 17 16 36 30 16 13 13 7.4 6.7 6.1 6.4 6.4 9.8 10 9.9 9.5 9.9 21 22 23 24 25 28 27 71 64 38 64 52 49 46 43 22 22 21 20 19 13 12 13 14 37 12 11 10 10 9.2 6.8 6.8 6.4 8.7 8.5 62 30 15 12 10 33 29 26 25 23 15 15 14 15 14 12 11 11 11 12 5.8 5.8 11 20 13 18 25 14 13 16 26 27 28 29 30 31 136 181 105 56 41 35 42 39 38 39 39 --- 20 19 19 18 17 17 26 14 12 12 11 12 9.5 8.9 9.2 --- 7.5 6.9 6.3 6.8 6.6 6.8 9.6 9.2 11 131 209 --- 22 84 46 70 42 35 14 15 13 12 13 --- 11 13 11 9.7 9.8 9.1 7.2 6.2 126 115 36 25 11 13 12 11 11 --- TOTAL MEAN MAX MIN CFSM IN. AC-FT 3267 105 1210 18 6.95 8.05 6480 2704 90.1 752 24 5.97 6.66 5360 782 25.2 35 17 1.67 1.93 1550 483 15.6 37 11 1.03 1.19 958 355.8 12.7 26 8.9 .84 .88 706 231.5 7.47 9.7 6.3 .49 .57 459 1340.2 44.7 250 5.7 2.96 3.30 2660 4878 157 1640 22 10.4 12.02 9680 572 19.1 30 12 1.26 1.41 1130 491.6 15.9 73 9.1 1.05 1.21 975 547.8 17.7 126 5.8 1.17 1.35 1090 599.0 20.0 157 9.5 1.32 1.48 1190 CAL YR 1985 WTR YR 1986 TOTAL TOTAL 16072.9 16251.9 MEAN MEAN 44.0 44.5 MAX MAX 2370 1640 MIN MIN 4.9 5.7 CFSM CFSM 2.91 2.95 IN. IN. 39.60 40.04 AC-FT AC-FT 31880 32240 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 1985 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1985 16... 1110 24 344 7.80 24.5 3.0 12 K710 320 DEC 06... 1025 32 317 7.80 22.5 7.0 <10 4900 2600 FEB 1986 04... 1100 15 316 8.20 22.0 25 8.4 98 36 5000 2000 APR 17... 1110 10 400 7.96 26.0 21 7.4 92 27 K1100 JUL 03... 0920 17 320 7.75 26.5 3.0 7.4 92 <10 K730 700 SEP 19... 0957 11 393 7.70 25.5 3.8 7.6 94 37 K750 370 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- HARD- NONCARB CALCIUM SLUM, SODIUM, AD- SIUM, WH WAT SULFATE RIDE, NESS WH WAT DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1985 16... 130 14 34 12 16 0.6 3.1 120 <0.5 18 22 DEC 06... 112 FEB 1986 04... 107 APR 17... 130 6 31 12 19 0.8 3.8 121 <0.5 15 27 JUL 03... - 117 SEP 19... 130 5 35 11 18 0.7 3.2 128 17 24 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) S102) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1985 16... 0.10 31 210 13 4 1.34 0.160 1.50 0.660 0.14 DEC 06... 12 1.37 0.130 1.50 0.490 0.41 FEB 1986 04... 22 1.51 0.390 1.90 0.450 0.95 APR 17... 0.10 30 210 6.0 4 0.780 0.320 1.10 1.20 0.50 JUL 03... 11 0.700 0.200 0.900 0.530 0.47 SEP 19... 0.10 32 220 6.2 7 0.760 0.140 0.900 0.810 1.1 K = non-ideal count 113 RIO CIBUCO BASIN 50038320 RIO CIBUCO BELOW COROZAL, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA . NITRO NITRO- PROS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1985 16... 0.80 2.3 10 0.180 <1 <100 30 <1 6 <10 DEC 06... 0.90 2.4 11 0.130 FEB 1986 04... 1.4 3.3 15 0.500 APR 17... 1.7 2.8 12 0.270 <1 100 20 <1 3 20 JUL 03... 1.0 1.9 8.4 0.270 SEP 19... 1.9 2.8 12 0.440 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1985 16... 300 1 50 <0.10 <1 <1 50 <0.010 2 0.06 DEC 06... FEB 1986 04... APR 17... 210 1 50 <0.10 <1 <1 50 <0.010 2 0.06 JUL 03... SEP 19,.. 114 I I I I 115 RIO CIBUCO BASIN 50039500 RIO CIBUCO AT VEGA BAJA, PR LOCATION.--Lat 18°26'531, long 66°22'29', Hydrologic Unit 21010002, 0.6 mi (1.0 km) downstream from Rio Indio, and 0.8 mi (1.3 km) east of Vega Baja. DRAINAGE AREA.--99.1-mi' (256.7 km,), of which 25.4 mil (65.8 km2 ), does not contribute directly to surface runoff. WATER-DISCHARGE RECORDS PERIOD OF RECORD.--January 1973 to current year. GAGE.--Water-stage recorder. Elevation of gage is 7.79 ft (2.37 m) above mean sea level. REMARKS.--Estimated daily discharges: Jan. 25 to Feb. 7. Records fair except those for estimated daily discharges, which are poor. AVERAGE DISCHARGE.--13 years (1974-86), 128 fti/s (3.625 m'/s), 17.54 in/yr (446 mm/yr), 92,740 acre-ft/yr (114 hm'/yr); median of yearly mean discharges, 120 ft'/s (3.40 m'/s), 86,900 acre-ft/yr (107 hmYyr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 30,300 ft'is (858 m3 /s), Dec. 13, 1981, gage height, 18.84 ft (5.742 ), from rating curve extended above 3,000 ft'is (85.0 '/s) on the basis of indirect measurements; minimum discharge, 6.1 ft'is (0.173 '/s), July 24, 25, 1977. EXTREMES OUTSIDE PERIOD OF RECORD.--Flood of Dec. 11, 1965 reached a stage of 26.2 ft (7.99 m), datum unknown, discharge about 28,000 ft'is (793 10/s). EXTREMES FOR CURRENT '?EAR.--Peak discharges greater than base discharge of 3,200 ft'is (90.6 '/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (m0/s) (ft) (m) Date Time (W/s) (10/s) (ft) (m) Oct. 7 0615 *20,200 572 *17.98 5.480 May 13 1315 14,200 402 17.48 5.328 Nov. 15 2230 3,960 112 15.83 4.825 Minimum discharge, 24 fe/s (0.680 m'/s), Mar. 31 to Apr. 1-3. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 77 157 145 68 56 36 26 742 150 63 33 472 2 76 131 139 70 64 35 27 1060 130 61 32 443 3 59 129 132 65 90 34 33 913 123 65 31 216 4 53 274 129 75 115 33 116 954 111 61 35 119 5 255 342 127 65 115 34 572 498 104 59 37 92 6 704 189 134 63 60 34 242 272 98 75 33 83 7 9710 135 118 61 56 34 80 493 93 73 31 76 8 998 118 111 61 54 33 451 612 93 71 32 68 9 409 107 113 65 50 32 403 925 93 59 30 65 10 298 105 111 127 49 35 124 872 88 55 30 52 11 222 13' 110 79 47 35 83 549 90 66 30 47 12 170 306 109 67 45 32 54 403 93 85 40 46 13 141 491 105 64 44 32 42 4650 116 59 73 48 14 122 706 95 63 43 34 36 2510 90 56 142 45 15 115 2490 92 61 42 35 33 538 118 163 69 43 16 105 2200 91 60 41 31 31 380 118 154 51 42 17 98 671 94 67 42 28 36 321 86 119 46 42 18 148 462 89 74 42 34 53 306 81 60 42 41 19 168 384 86 64 42 31 35 254 78 45 40 40 20 229 352 83 57 43 30 82 218 74 41 40 40 21 178 398 79 56 57 29 299 206 72 38 40 47 22 105 315 80 55 41 28 260 192 68 35 40 69 23 97 288 80 55 38 27 82 173 66 35 42 84 24 333 246 76 55 37 30 51 160 65 35 119 55 25 341 220 74 175 37 45 41 150 65 47 123 61 26 424 199 73 115 37 36 35 143 63 46 50 55 27 595 184 71 56 36 31 32 186 67 35 40 49 28 399 167 74 54 35 29 39 254 66 42 302 50 29 309 164 72 54 --- 28 227 295 61 38 399 47 30 204 160 69 53 28 488 215 59 34 191 48 31 199 --- 67 52 26 --- 169 --- 34 115 TOTAL 17341 12221 3028 2156 1458 999 4113 19613 2679 1909 2358 2685 MEAN 559 407 97.7 69.5 52.1 32.2 137 633 89.3 61.6 76.1 89.5 MAX 9710 2490 145 175 115 45 572 4650 150 163 399 472 MIN 53 105 67 52 35 26 26 143 59 34 30 40 CFSM 5.64 4.11 .99 .70 .53 .32 1.38 6.39 .90 .62 .77 .90 IN. 6.51 4.59 1.14 .81 .55 .38 1.54 7.36 1.01 .72 .89 1.01 AC-FT 34400 24240 6010 4280 2890 1980 8160 38900 5310 3790 4680 5330 CAL YR 1985 TOTAL 74652 MEAN 205 MAX 10800 MIN 32 CFSM 2.07 IN. 28.02 AC-FT 148100 WTR YR 1986 TOTAL 70560 MEAN 193 MAX 9710 MIN 26 CFSM 1.95 IN. 26.49 AC-FT 140000 116 RIO CIBUCO BASIN 50039500 RIO CIBUCO AT VEGA BAJA, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORD.--Water years 1972 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1985 15... 1230 120 440 7.80 25.5 8.5 10 3900 820 DEC 02... 1330 138 406 7.80 24.5 8.5 7.8 94 <10 2900 320 FEB 1986 07... 1145 58 390 7.90 23.0 11 4.9 58 14 K1100 520 APR 09... 1625 342 7.68 25.0 95 7.2 87 28 K7900 K12000 JUL 1... 1115 62 409 7.78 28.5 3.0 4.2 54 <10 K1700 290 SEP 2... 1115 550 342 7.75 24.5 170 6.8 82 18 25000 30000 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- HARD- NONCARB CALCIUM SIUM, SODIUM, AD- SIUM, WATER SULFATE RIDE, NESS WATER DIS- D1S- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L TOT FLO SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1985 15... 210 26 68 8.7 13 0.4 2.9 180 <0.5 18 22 DEC 02... 167 FEB 1986 07... 151 APR 09... 130 26 41 7.2 12 0.5 3.9 106 <0.5 22 17 JUL 1... 167 SEP 2... 140 9 47 5.4 9.1 0.4 4.5 131 14 11 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GUI, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1985 15... 0.20 20 260 84 9 1.26 0.040 1.30 0.120 0.48 DEC 02... 13 1.36 0.040 1.40 0.090 0.41 FEB 1986 07... 24 1.44 0.060 1.50 0.150 0.45 APR 09... 0.10 15 180 0.0 134 1.64 0.060 1.70 0.250 0.75 JUL 1... 12 1.04 0.060 1.10 0.200 0.30 SEP 2... 0.10 12 180 270 34 0.950 0.050 1.00 0.120 2.4 K = non-ideal count 117 RIO CIBUCO BASIN 50039500 RIO CIBUCO AT VEGA BAJA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEM, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- YOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1985 15... 0.60 1.9 8.4 0.120 <1 <100 40 <1 12 10 DEC 02... 0.50 1.9 8.4 0.130 FEB 1986 07... 0.60 2.1 9.3 0.230 APR 09... 1.0 2.7 12 0.240 1 <100 10 <1 20 10 JUL 1... 0.50 1.6 7.1 0.200 SEP 2... 2.5 3.5 15 0.190 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE kECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1985 15... 920 2 100 <0.10 <1 <1 20 <0.010 <1 0.06 DEC 02... FEB 1986 07... APR 09... . 4700 3 210 <0.10 <1 <1 40 <0.010 1 0.06 JUL 1... SEP 2... RIO CIBUCO BASIN 50039650 DRAINAGE DITCH BELOW WARNER LAMBERT LABORATORY NR SABANA, PR WATER-QUALITY RECORDS LOCATION.--Lat 18'27'17", long 66°21'09", 0.3 mile (0.5 km) northwest of Warner Lambert Laboratory, 0.6 mile (1.0 km) south of Sabana, and 1.1 miles (1.8 km) above confluence with Rio Cibuco. DRAINAGE AREA.--Indeterminate. PERIOD OF RECORD.--Water years 1982 to April 1986 (discontinued). WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIVIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) NOV 1985 08... 0905 E3.0 300 6.40 26.0 11 71 K1500 2000 DEC 18... 1220 E3.0 718 6.90 25.5 15 35 360 K1200 FEB 1986 05... 1510 10.0 440 7.15 25.5 22 2.4 30 54 K1100 3000 APR 22... 1235 E0.0 494 7.29 27.5 11 1.2 15 40 5300 300 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- HARD- NONCARB CALCIUM SIUM, SODIUM, AD- SIUM, WATER SULFATE RIDE, NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) NOV 1985 08... 73 7 21 5.0 31 2 4.3 66 <0.5 13 53 DEC 18... 105 FEB 1986 05... 101 APR 22... 160 13 49 9.1 31 1 2.6 147 <0.5 16 42 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, D1S- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, D1S- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) NOV 1985 08... 0.10 10 180 0.0 18 0.010 <0.100 0.090 0.91 DEC 18... 8 0.010 <0.100 0.040 0.96 FEB 1986 05... 26 0.190 0.010 0.200 0.040 1.2 APR 22... 0.20 10 250 0.0 11 0.060 0.040 0.100 0.280 0.62 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RLCOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) NOV 1985 08... 1.0 DEC 18... 1.0 FEB 1986 05... 1.2 1.4 6.2 APR 22... 0.90 1.0 4.4 K = non-ideal count 0.100 4 <100 110 1 6 <10 0.050 0.140 0.120 1 100 100 <1 8 <10 118 119 RIO CIBUCO BASIN 50039650 DRAINAGE DITCH BELOW WARNER LAMBERT LABORATORY NR SABANA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UGiL (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) NOV 1985 08... 5000 2 230 <0.10 <1 20 <0.010 3 0.07 <1 DEC 18... FEB 1986 05... APR 22... 1100 1 110 <0.10 <1 <1 20 <0.010 2 0.08 RIO CIBUCO BASIN 50039700 DRAINAGE DITCH AT RIO CIBUCO BELOW CENTRAL SAN VICENTE, PR WATER-QUALITY RECORDS LOCATION.--tat 18'27'44", long 66°21'52", 60 ft (18 m), above corfluence with Rio Cibuco, 984 ft (300 m) east of Central San Vicente, and 0.7 mi (1.2 km) west of Sabana. DRAINAGE AREA.--Indeterminate. PERIOD OF RECORD.--Water years 1982 to April 1986 (discontinued). WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1985 25... 1055 30 368 7.00 26.0 21 0.8 10 K1100 20000 DEC 05... 0945 23 606 7.20 24.5 15 30 570 6000 FEB 1986 07... 1450 14 418 7.70 25.0 14 4.6 56 43 330 770 APR 21... 1455 -- 480 7.48 27.0 17 4.7 59 39 -- 21... 1455 3.9 480 7.48 27.0 17 4.7 59 39 K1000 3300 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- HARD- NONCARB CALCIUM S1UM, SODIUM, AD- SLUM, WATER SULFATE RIDE, NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CACO3 AS S) AS SO4) AS CL) OCT 1985 25... 110 0 24 12 14 0.6 2.2 109 <C.5 16 20 DEC 05... 143 FEB 1986 07... 136 APR 21... -- -- -- 170 -- 21... 170 1 54 8.7 18 0.6 2.8 170 <0.5 15 32 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1985 25... <0.10 24 180 14 28 1.17 0.030 1.20 0.070 0.33 DEC 05... 26 0.190 0.010 0.200 0.050 0.65 FEB 1986 07... 30 0.230 0.070 0.300 0.510 0.69 APR 21... 31 -- 21... 0.20 15 250 2.6 31 0.080 0.020 0.100 0.070 0.83 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL . TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECGV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1985 25... 0.40 1.6 7.1 2.20 <1 <100 70 1 5 10 DEC 05... 0.70 0.90 4.0 0.080 FEB 1986 07... 1.2 1.5 6.6 0.090 APR 21... -- 21... 0.90 1.0 4.4 0.120 2 <100 <10 <1 15 10 K = non-ideal count 120 121 RIO CIBUCO BASIN 50039700 DRAINAGE DITCH AT RIO CIBUCO BELOW CENTRAL SAN VICENTE, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1985 25... 1400 3 80 <0.10 <1 1 30 <0.010 <1 0.06 DEC 05... FEB 1986 07... APR 21... -- 21... 770 4 290 0.50 <1 <1 20 <0.010 2 0.05 I RIO CIBUCO BASIN 50039750 RIO CIBUCO BELOW CENTRAL SAN VICENTE, PR WATER-QUALITY RECORDS LOCATION.--Lat 18'27'47", long 66'21'53", at bridge on Highway 688, 1,000 ft (305 m) northeast of Central San Vicente, 0.8 mi (1.3 km) west of Sabana, and 1.3 i (2.1 ka) northwest of Warner Lambert Laboratory. DRAINAGE AREA.--Indeterminate. PERIOD OF RECORD.--Water years 1982 to April 1986 (discontinued). WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLI- STREP- STREAM- FLOW, INSTAN- SPE- CIFIC CON- DUCT- PH (STAND- TEMPER- ATURE TUR- BID- OXYGEN, DIS- DIS- SOLVED (PER- CENT DEMAND, CHEM- ICAL (HIGH FORM, FECAL, 0.7 UM-MF TOCOCCI FECAL, KF AGAR (COLS. DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) NOV 1985 01... 1445 211 389 7.80 26.0 36 27 2300 500 DEC 06... 1415 124 475 7.70 24.5 13 52 K1500 500 FEB 1986 04... 1450 68 406 7.80 22.5 35 7.0 82 20 2400 4100 APR 21... 1150 144 366 7.72 26.0 41 6.6 81 39 28000 27000 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- HARD- NONCARB CALCIUM S1UM, SODIUM, AD- SLUM, WATER SULFATE RIDE, NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) NOV 1985 01... 170 20 54 8.0 15 0.5 2.8 148 <0.5 19 24 DEC 06... 157 FEB 1986 04... - 144 APR 21... 140 13 44 6.4 12 0.5 5.0 123 <0.5 34 16 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) NOV 1985 01... 0.10 17 230 130 180 0.860 0.040 0.900 0.120 0.78 DEC 06... -- 22 1.07 0.030 1.10 0.050 0.65 FEB 1986 04... -- 43 0.850 0.050 0.900 0.110 0.69 APR 21... 0.20 14 210 80 60 1.33 0.070 1.40 0.190 0.91 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) NOV 1985 01... 0.90 1.8 8.0 0.140 2 <100 30 <1 20 20 DEC 06... 0.70 1.8 8.0 0.100 FEB 1986 04... 0.80 1.7 7.5 0.200 APR 21... 1.1 2.5 11 0.290 1 100 10 <1 16 10 K = non-ideal count 122 123 RIO CIBUCO BASIN 50039750 RIO CIBUCO BELOW CENTRAL SAN VICENTE, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 DATE MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- (UG/L (UG/L (0G/L, (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) NOV 1985 01... DEC 06... FEB 1986 04... APR 21... 4200 1900 5 170 <0.10 6 120 <0.10 <1 <1 <1 <1 70 <0.010 30 <0.010 <1 0.05 <1 0.06 125 .214 ATLANTIC C E N DORADO • 215 k AJA> CATAKi0 VEGA ALTA N Drainage boundaries indeterminate in limestone terrone TOA ALTA Limestone Igneous and sedimentary rocks ▪BAYAMON i...+mestone Igneous and "s\ sedimentary rocks (-N \ OR OZ AL EC —Map area SAN JV AN 044 50 6 NARANJI TO AYASVSZ FA4ANDO „CANVAS YANA Drainage bound° yarndn basin COMERIO Rib Grande ae Mcmotl. basin island r divide BARRANOUITAS La Plot Grand* de Loi-za basin A BONITO R`o Caarno basin AYEY 't Island divide EXPLANATION A0469 SURFACE—WATER STATION AND NUMBER -0430 QUALITY—OF—WATER STATION AND NUMBER D0399 QUALITY—OF—WATER PARTIAL RECORD STATION AND NUMBER 4,216 WELL AND WELL NUMBER f2ia Grande de Patitios basin Turoe!ituodirani Figure 16.--Rio de la Plata basin. 126 RIO DE LA PLATA BASIN 50043000 RIO DE LA PLATA AT PROYECTO LA PLATA, PR LOCATION.--Lat 18'09'37', long 66° 13'44", Hydrologic Unit 21010005, at upstream side of bridge on Highway 173, 0.4 mi (0.6 km) northeast of Proyecto La Plata, and 2.5 mi (4.0 km) upstream from Rio Usabon. DRAINAGE AREA.--54.8 mil (141.9 km 2), excludes 8.2 mi 2 (21.1 km 2 ) upstream from Carite Reservoir, the flow of which is diverted to Rio Guamani. WATER-DISCHARGE RECORDS PERIOD OF RECORD.--1958 (occasional measurements only), February 1959 to March 1960 (monthly measurements only), April 1960 to current year. GAGE.--Water-stage recorder. Elevation of gage is 850 ft (259 m), from topographic map. Prior to Mar. 29, 1961, wire-weight gage read twice daily at same site and datum. REMARKS.--Estimated daily discharges: Oct. 6-17. Apr. 10-14, June 2-6, Aug. 19-22 and Aug. 29, 30. Records fair except those for estimated daily discharges, which are poor. The Puerto Rico Aqueduct and Sewer Authority operates a pumping plant about 5 mi (8 km) upstream which can divert as much as 23 ft'is (0.65 m 3/s) into Cidra Reservoir. AVERAGE DISCHARGE.--26 years (1961-86), 113 fti/s (3.200 mYs), 28.00 in/yr (111 mm/yr), 81,870 acre-ft/yr (101 hiP/yr); median of yearly mean discharges, 91 ft'is (2.58 m'/s), 65,900 acre-ft/yr (81 hm'/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 59,600 ft'is (1,690 m'/s), Aug. 27, 1961, gage height, 32.21 ft (9.818 m), from rating curve extended above 7,000 ft'is (198 0/s) on basis of slope-area measurement; minimum daily discharge, 2.6 ft'is (0.074 m'/s), July 25, 1974. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 4,000 ft'is (113 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (W/s) (80/s) (ft) (m) Date Time (W/s) (m'/s) (ft) (m) Oct. 6 1330 *28,900 818 *22.00 6.706 May 13 2400 4,600 130 10.50 3.200 Minimum daily discharge, 6.2 ft'A (0.176 m 3/s), Aug. 27. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 28 248 98 44 27 15 14 186 47 22 18 159 2 43 146 92 49 31 14 12 92 59 26 15 56 3 30 498 86 50 37 13 44 50 56 21 13 33 4 33 291 82 58 51 14 73 44 47 26 12 28 5 84 272 86 54 75 16 47 41 45 25 14 26 6 5000 246 91 46 37 17 36 40 42 26 13 27 7 3000 191 84 42 29 16 18 146 41 34 11 25 8 1000 156 75 39 28 13 219 146 48 23 15 22 9 350 134 79 53 31 13 111 147 74 20 17 18 10 250 120 77 86 29 13 24 599 75 19 13 18 11 180 109 76 51 24 13 22 553 49 22 15 17 12 150 149 84 43 24 17 21 199 41 53 24 16 13 120 380 91 39 24 16 24 766 38 34 22 15 14 110 401 73 37 23 19 50 611 47 31 44 17 15 100 1110 70 35 22 23 44 175 37 34 15 17 16 90 595 68 34 22 25 90 82 52 29 13 11 17 83 389 62 34 22 18 57 52 35 22 12 11 18 134 870 60 40 23 15 49 387 27 19 11 9.5 19 157 339 61 34 24 16 46 178 23 21 9.0 8.5 20 92 319 63 32 27 14 81 79 24 26 8.2 7.8 21 77 697 59 32 23 14 58 54 22 26 7.8 12 22 76 263 57 33 20 14 33 45 23 25 7.2 16 23 482 207 55 25 20 14 29 36 23 21 17 13 24 604 167 59 51 20 14 26 30 23 18 11 16 25 506 146 63 48 20 15 25 27 23 18 12 21 26 374 131 65 31 22 14 25 24 23 18 6.8 24 27 544 122 55 29 19 14 26 24 22 18 6.2 18 28 215 114 52 21 16 13 27 29 25 19 11 20 29 752 106 50 23 --- 33 417 32 26 20 631 23 30 676 102 48 25 45 553 27 26 17 138 25 31 729 --- 45 21 21 --- 71 --- 18 66 --- TOTAL 16069 9018 2166 1239 770 531 2301 4972 1143 751 1228.2 729.8 MEAN 518 301 69.9 40.0 27.5 17.1 76.7 160 38.1 24.2 39.6 24.3 MAX 5000 1110 98 86 75 45 553 766 75 53 631 159 MIN 28 102 45 21 16 13 12 24 22 17 6.2 7.8 CFSM 9.45 5.49 1.28 .73 .50 .31 1.40 2.92 .70 .44 .72 .44 IN. 10.91 6.12 1.47 .84 .52 .36 1.56 3.38 .78 .51 .83 .50 AC-FT 31870 17890 4300 2460 1530 1050 4560 9860 2270 1490 2440 1450 CAL YR 1985 TOTAL 57179.9 MEAN 157 MAX 5000 MIN 8.0 CFSM 2.86 IN. 38.82 AC-FT 113400 WTR YR 1986 TOTAL 40918.0 MEAN 112 MAX 5000 MIN 6.2 CFSM 2.04 IN. 27.78 AC-FT 81160 RIO DE LA PLATA BASIN 51)043000 RIO DE LA PLATA AT PROYECTO LA PLATA, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORD.--Water years 1958 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL. FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1985 18... 1030 122 327 8.20 25.5 1.0 11 2000 K170 DEC 09... 1100 30 402 8.20 23.5 1.4 <10 290 160 FEB 1986 14... 1110 ?4 480 8.45 24.0 1.8 9.9 122 20 K630 410 APR 10... 1415 23 417 7.90 30.5 6.0 12.2 167 23 450 480 JUL 15... 1325 32 362 8.70 29.5 3.0 10.0 134 <10 K70 K99 SEP 24... 1435 27 356 8.17 30.5 15 7.2 99 <10 41 320 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- HARD- NONCARB CALCIUM SIUM, SODIUM, AD- SIUM, WATER SULFATE RIDE, NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE 01S- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1985 18... 120 7 31 11 21 0.9 1.5 116 <0.5 15 22 DEC 09... 148 FEB 1986 14... 162 APR 10... 140 13 37 12 25 0.9 2.6 129 <0.5 17 27 JUL 15... 133 SEP 24... 120 4 29 11 21 0.9 2.7 114 18 20 SOLIDS, SOLIDS, FLUID- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, D1S- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/1) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1985 18... 0.10 23 190 64 2 0.730 0.070 0.800 0.040 0.36 DEC 09... 5 1.02 0.080 1.10 0.050 0.45 FEB 1986 14... 1 2.06 0.040 2.10 0.040 0.66 APR 10... 0.20 23 220 14 16 1.74 0.060 1.80 0.060 0.64 JUL 15... 7 0.880 0.020 0.900 0.020 0.88 SEP 24... 0.10 20 190 14 9 1.24 0.060 1.30 0.030 0.57 K = non-ideal count 127 RIO DE LA PLATA BASIN 50043000 RIO DE LA PLATA AT PROYECTO LA PLATA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1985 18... 0.40 1.2 5.3 0.150 1 <100 40 1 4 <10 DEC 09... 0.50 1.6 7.1 0.220 FEB 1986 14... 0.70 2.8 12 0.500 APR 10... 0.70 2.5 11 0.370 1 <100 40 <1 6 10 JUL 15... 0.90 1.8 8.0 0.360 SEP 24... 0.60 1.9 8.4 0.290 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1985 18... 180 <1 10 <0.10 <1 <1 20 <0.010 <1 0.07 DEC 09... FEB 1986 14... APR 10... 400 2 40 0.20 <1 <1 30 <0.010 <1 0.08 JUL 15... SEP 24... 128 129 RIO DE LA PLATA BASIN 50044000 RIO DE LA PLATA NEAR COMERIO, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°14'33", long 66°12'28", 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 AREA.--139 sq mi (360 sq km). PERIOD OF RECORD.--Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1985 18... 1410 197 362 8.20 25.5 3.6 <10 25000 25000 DEC 20... 0850 143 397 8.30 23.5 1.5 14 K620 360 FEB 1986 20... 1035 68 449 8.45 21.5 1.3 9.3 108 29 1000 730 APR 25... 1020 41 432 7.93 26.5 3.2 8.0 101 23 280 K100 JUL 16... 0900 86 362 8.00 26.5 1.8 8.5 107 <10 K1300 K800 SEP 05... 0855 58 365 7.61 27.0 4.6 7.6 98 <10 500 250 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- HARD- NOWCARB CALCIUM SLUM, SODIUM, AD- SIUM, WATER SULFATE RIDE, NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1985 18... 140 9 33 13 20 0.8 2.3 127 <0.5 18 22 DEC 20... 152 FEB 1986 20... 150 APR 25... 150 12 35 15 25 0.9 2.7 137 <0.5 16 27 JUL 16... 132 SEP 05... 130 11 31 13 21 0.8 2.9 120 18 19 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, D1S- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, D1S- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L 01S- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) 5102) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1985 18... 0.10 23 210 110 11 0.690 0.010 0.700 0.040 0.46 DEC 20... 5 0.980 0.020 1.00 0.050 0.35 FEB 1986 20... 4 0.970 0.030 1.00 0.070 0.33 APR 25... 0.20 28 230 26 4 0.850 0.050 0.900 0.090 0.51 JUL 16... 9 0.580 0.020 0.600 0.030 0.37 SEP 05... 0.10 27 200 32 6 0.760 0.040 0.800 0.050 3.0 K = non-ideal count RIO DE LA PLATA BASIN 50044000 RIO DE LA PLATA NEAR COMERIO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MUM, COPPER, MONIA NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS 8) AS CD) AS CR) AS CU) OCT 1985 18... 0.50 1.2 5.3 0.120 1 <100 60 1 6 10 DEC 20... 0.40 1.4 6.2 0.190 FEB 1986 20... 0.40 1.4 6.2 0.280 APR 25... 0.60 1.5 6.6 0.310 1 100 60 <1 9 10 JUL 16... 0.40 1.0 4.4 0.200 SEP 05... 3.0 3.8 17 0.210 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (LG/L) (MG/L) OCT 1985 18... 400 1 20 <0.10 <1 <1 40 <0.010 <1 0.07 DEC 20... FEB 1986 20... APR 25... 390 <1 30 0.10 <1 <1 30 <0.010 <1 0.05 JUL 16... SEP 05... 130 I I 131 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 i (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 sq i (10.3 sq km). PERIOD OF RECORD.--Water year 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1985 25... 1525 17 301 8.00 26.5 13 42 2100 2400 DEC 20... 1045 ' 12 304 8.30 23.5 3.0 <10 3100 600 FEB 1986 20... 1315 6.2 302 8.65 24.5 1.3 10.2 124 24 K1000 930 APR 25... 1335 6.4 355 8.25 30.5 1.5 8.5 113 <10 570 K130 JUL 16... 1220 11 301 7.60 27.5 20 7.8 98 45 9300 2700 SEP 05... 1200 7.9 355 7.80 29.5 4.4 7.7 102 <10 K100 HARD- ALKA- NESS KAGNE- SODIUM POTAS- LINITY CHLO- HARD- NONCARB CALCIUM SIUM, SODIUM, AD- SLUM, WATER SULFATE RIDE, NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1985 25... 120 20 37 6.9 25 1 4.5 101 <0.5 19 42 DEC 20... 110 FEB 1986 20... 105 APR 25... 130 21 30 14 17 0.7 2.5 112 <0.5 15 24 JUL 16... 90 SEP 05... 140 28 31 14 17 0.7 2.6 107 19 21 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1985 25... <0.10 14 210 9.6 16 0.010 <0.100 0.230 1.1 DEC 20... 6 1.13 0.070 1.20 0.150 0.45 FEB 1986 20... 3 1.19 0.010 1.20 0.040 0.56 APR 25... 0.10 26 200 3.4 1 <0.010 1.40 0.030 0.47 JUL 16... 39 1.99 0.010 2.00 0.050 0.75 SEP 05... 0.10 27 200 4.2 2 1.29 0.010 1.30 <0.010 K = non-ideal count RIO DE LA PLATA BASIN 50044850 RIO GUADIANA NEAR NARANJITO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1985 25... 1.3 -- 0.120 2 <100 60 1 1 <10 DEC 20... 0.60 1.8 8.0 0.190 -- FEB 1986 20... 0.60 1.8 8.0 0.310 APR 25... 0.50 1.9 8.4 0.300 1 100 <10 <10 JUL 16... 0.80 2.8 12 0.210 SEP 05... 0.60 1.9 8.4 0.250 -- MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1985 25... 3400 1 230 <0.10 <1 <1 40 <0.010 5 0.08 DEC 20... FEB 1986 20... APR 25... 270 1 30 <0.10 <1 <10 <0.010 <1 0.04 JUL 16... SEP 05... 132 RIO DE LA PLATA BASIN 50046000 RIO DE LA PLATA AT 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 sq ni (539 sq km), exclude 8.2 sq mi (21.2 sq km) upstream from Lago Carite, flow from which is diverted to Rio Guamani. PERIOD OF RECORD.--Water years 1958 to current year WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 OXYGEN, COLI- STREP- SPE- DIS- FORM, TOCOCCI STREAM- CIFIC SOLVED FECAL, FECAL, HARD- FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- 0.7 KF AGAR NESS INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT UM-MF (COLS. (MG/L DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED SATUR- (COLS./ PER AS (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) 100 ML) 100 ML) CAC03) OCT 1985 16... 1630 231 296 7.60 28.0 0.60 K680 200 120 DEC 05... 1140 224 319 7.80 25.5 17 2800 86 130 FEB 1986 05... 1020 233 400 7.80 25.0 17 4.7 57 4300 6500 160 APR 08... 1140 102 446 8.01 27.5 6.2 6.7 84 K2500 K160 160 JUN 4... 1035 157 335 7.25 28.5 6.0 5.4 69 2600 K150 130 AUG 26... 1120 15 491 7.85 30.0 3.1 9.4 125 350 82 210 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- FLUO- SILICA, NONCARB CALCIUM SIUM, SODIUM, AD- SIUM, WATER SULFATE RIDE, RIDE, DIS- WATER DIS- DIS- DIS- SORP- DIS- TOTAL DIS- DIS- DIS- SOLVED TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD SOLVED SOLVED SOLVED (MG/L DATE MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L AS CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS SO4) AS CL) AS F) SI02) OCT 1985 16... 32 34 8.3 13 0.5 2.1 87 17 18 0.10 20 DEC 5... 9 34 10 16 0.6 2.1 117 15 22 0.10 21 FEB 1986 05... 9 43 13 23 0.8 2.8 152 15 29 <0.10 19 APR 08... 6 40 14 22 0.8 2.5 152 18 29 0.20 22 JUN 4... 7 37 9.8 16 0.6 2.6 126 17 19 0.10 18 AUG 26... 17 61 13 25 0.8 3.3 189 18 35 0.30 20 SOLIDS, SOLIDS, NITRO- NITRO- NITRO- NITRO- PHOS- PHOS- RESIDUE SUM OF SOLIDS, GEN, . GEN, GEN, GEN,AM- PHOS- PHORUS, PHATE, AT 180 CONSTI- DIS- NO2+NO3 AMMONIA AMMONIA MONIA + PHOS- PHORUS, ORTHO, ORTHO, DEG. C TUENTS, SOLVED DIS- DIS- DIS- ORGANIC PHORUS, DIS- DIS- DIS- DIS- DIS- (TONS SOLVED SOLVED SOLVED TOTAL TOTAL SOLVED SOLVED SOLVED DATE SOLVED SOLVED PER (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L) (MG/L) DAY) AS N) AS N) AS NH4) AS N) AS P) AS P) AS P) AS PO4) OCT. 1985 16... 176 170 110 0.920 0.090 0.12 0.60 0.120 0.050 0.020 0.06 DEC 5... 174 190 105 0.740 0.110 0.14 0.60 0.120 0.090 0.080 0.25 FEB 1986 05... 231 240 145 0.510 0.360 0.46 0.80 0.210 0.140 0.130 0.40 APR 08... 241 240 66 0.200 0.180 0.23 0.70 0.130 0.090 0.060 0.18 JUN 04... 198 200 84 0.540 0.110 0.14 0.50 0.080 0.050 0.040 0.12 AUG 26... 297 290 12 0.590 0.180 0.23 1.1 0.570 0.370 0.010 0.03 K non-ideal count 133 RIO DE LA PLATA BASIN 50046000 RIO DE LA PLATA AT TOA ALTA, PR--Continued (National stream-quality accounting network station) WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 ALUM- BERYL- CHRO- INUM, ARSENIC BARIUM, LIUM, CADMIUM MIUM, COBALT, COPPER, IRON, LEAD, DIS- DIS- DIS- DIS- D1S- DIS- DIS- DIS- DIS- DIS- SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS AL) AS AS) AS BA) AS BE) AS CD) AS CR) AS CO) AS CU) AS FE) AS PB) OCT 1985 16... 70 <1 42 <0.5 <1 <1 <3 4 55 2 DEC 05... FEB 1986 05... 20 1 50 <0.5 2 <1 <3 2 9 <1 APR 08... JUN 04... 80 1 41 <0.5 1 <1 <3 4 10 1 AUG 26... 30 2 56 <0.5 <1 2 <3 4 6 <5 MANGA- MOLYB- SELE- STRON- VANA- LITHIUM NESE, MERCURY DENUM, NICKEL, NIUM, SILVER, TIUM, DIUM, ZINC, DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOcVED SOLVED DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS LI) AS MN) AS HG) AS MO) AS NI) AS SE) AS AG) AS SR) AS V) AS ZN) OCT 1985 16... <4 53 <0.1 <10 6 <1 <1 130 6 15 DEC 05... FEB 1986 05... 5 240 0.1 <10 <1 <1 <1 220 8 5 APR 08... JUN 04... 4 46 0.2 <10 <1 <1 <1 160 7 8 AUG 26... <4 140 <0.1 <10 1 <1 <1 340 7 5 PESTICIDE ANALYSES CHLOR- DI- DI- PCB, ALDRIN, DANE, DDD, DDE, DDT, AZINON, ELDRIN DATE 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) JUN 1986 04... 1035 <0.1 <0.010 <0.1 <0.010 <0.010 <0.010 0.09 <0.010 HEPTA- METH- ENDO- HEPTA- CHLOR MALA- OXY- SULFAN, ENDRIN, ETHION, CHLOR, EPDXIDE LINDANE THION, CHLOR, DATE TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN 1986 04... <0.010 <0.010 <0.01 <0.010 <0.010 <0.010 <0.01 <0.01 NAPH- THA- METHYL METHYL LENES, PARA- TRI- PARA- POLY- PER- TOX- TOTAL THION, THION, MIREX, THION, CHLOR. THANE APHENE, TRI- DATE TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL THION (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (JG/L) (UG/L) JUN 1986 04... <0.01 <0.01 <0.01 <0.01 <0.10 <0.1 <1 <0.01 134 135 RIO DE LA PLATA BASIN 50046000 RIO DE LA PLATA AT TOA ALTA, PR--Continued (National stream-quality accounting network station) WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT SEDI- SED. MENT, SUSP. STREAM- SEDI- DIS- SIEVE FLOW, MENT, CHARGE, DIAM. INSTAN- SUS- SUS- e FINER DATE TIME TANEOUS PENOED PENDED THAN (CFS) (MG/L) (T/DAY) .062 MM OCT 1985 16... 1630 250 293 198 94 DEC 05... 1230 251 52 35 95 APR 1986 08... 1200 121 64 21 86 JUN 04... 1035 152 52 21 97 AUG 26... 1120 14 22 0.83 41 136 RIO DE LA PLATA BASIN 50046900 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. Prior to September 25, 1984, at site about 1.0 mi (1.6 km) upstream. DRAINAGE AREA.--208 mi' (539 km,), excludes 8.2 mi' (21.2 km') upstream from Lago Carite, flow from which is diverted to Rio Guamani. Area at site used prior to September 25, 1984, 200 mi' (518 km 2). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--November 1959 (measurement only), January 1960 to current year. Prior to September 1984, published as Rio de la Plata at Toa Alta, P.R. GAGE.--Water-stage recorder. Elevation of gage is 0.0 ft (0.0 m), from topographic map. REMARKS.--Estimated daily discharges: May 1, 9-13. Records fair except those for estimated daily discharges, which are poor. Regulation at all stages by Puerto Rico Aqueduct and Sewer Authority reservoir upstream from gage. AVERAGE DISCHARGE.--26 years (1961-86), 281 ft'/s (7.958 mi/s), 19.08 in/yr (485 mm/yr), 203,600 acre-ft/yr (251 hie/yr); median of yearly mean discharges, 230 ft'is (6.51 10/s), 167,000 acre-ft/yr (210 hoe/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 95,500 ftys (2,700 mi/s), Sept. 6, 1960, gage height, 36.35 ft (11.079 m), from floodmark, from rating curve extended above 12,000 ft'is (340 e/s) on basis of contracted-opening measurement of peak flow at site 1.0 mi upstream and different datum; minimum discharge, 2.2 ft'/s (0.062 10/s), Apr. 25, 1984. EXTREMES OUTSIDE PERIOD OF RECORD.--Approximate discharges and elevations of major floods, as pointed out by local residents are as follows: Sept. 13, 1928, 120,000 ft'/s (3,400 m'/s), gage height, 37.4 ft (11.40 m); June 16, 1943, 82,000 ft'/s (2,320 e/s), gage height, 34.4 ft (10.48 m), at site 1.0 mi upstream and different datum. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 6,000 ft'is (170 10/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (e/s) (ft) (m) Date Time (f't/s) (e/s) (ft) (m) Oct. 7 0300 *74,400 2,110 *24.58 7.492 May 1 2245 6,280 178 12.85 3.917 Oct. 8 0930 9,280 263 14.94 4.554 May 13 1200 30,700 869 20.64 6.291 Oct. 26 1730 7,380 209 13.72 4.182 May 14 0615 23,900 666 19.53 5.953 Nov. 15 1915 7,720 219 13.98 4.261 Minimum discharge, 2.6 ft'is (0.074 80/s), Apr. 1, 28. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 DAY OCT NOV DEC JAN MEAN FEB VALUES MAR APR MAY JUN JUL AUG SEP 1 2 3 4 5 119 98 83 78 640 989 617 677 1310 553 268 259 242 244 232 104 115 110 125 113 27 27 39 71 189 5.9 6.2 6.5 6.3 5.4 11 9.7 10 20 1100 3100 1290 342 197 179 412 259 194 158 142 24 21 19 18 17 33 15 15- 18 23 192 509 187 89 59 6 7 8 9 10 9880 36100 6210 1920 854 395 347 304 271 256 264 230 203 207 211 102 97 96 170 192 114 82 74 66 59 5.7 6.8 6.3 6.3 8.5 778 191 259 1180 309 110 337 392 980 1000 116 103 107 108 147 28 33 17 17 17 15 17 19 24 21 55 51 45 43 38 11 12 13 14 15 544 418 342 296 264 282 485 968 1140 5580 194 192 188 188 161 120 103 98 88 74 43 28 21 13 10 8.4 6.9 7.4 11 7.9 120 82 71 57 48 2900 800 12000 10100 1450 164 178 181 129 221 111 61 21 18 147 21 41 126 94 35 34 26 21 17 15 16 17 18 19 20 231 212 538 318 392 3260 1220 1500 935 677 156 161 142 136 134 68 76 84 80 68 11 11 9.4 7.1 7.3 8.2 7.7 10 9.2 9.5 36 20 15 10 15 705 479 526 939 482 268 145 106 86 78 174 347 79 47 33 25 20 17 16 20 13 13 12 12 11 21 22 23 24 25 236 184 244 2470 1340 1600 858 567 468 396 129 128 128 126 109 59 55 56 57 60 10 9.6 13 10 8.1 9.3 8.4 7.8 9.9 13 87 74 55 42 20 339 273 223 189 169 68 61 54 47 40 26 21 18 20 21 26 24 21 24 19 15 18 22 17 26 26 27 28 29 30 31 2220 2250 1260 1590 1760 2140 354 325 304 295 281 --- 113 114 110 107 101 98 68 72 64 51 40 29 6.6 5.8 5.9 --- 13 13 9.2 8.0 6.8 9.2 11 5.6 3.0 391 3210 --- 155 142 451 416 323 347 34 34 36 32 27 --- 17 17 21 22 20 44 16 16 '43 2010 704 257 23 17 20 22 17 --- TOTAL MEAN MAX MIN CFSM IN. AC-FT 75231 2427 36100 78 12.1 13.99 149200 27214 907 5580 256 4.53 5.06 53980 5275 170 268 98 .85 .98 10460 2694 86.9 192 29 .43 .50 5340 977.8 34.9 189 5.8 .17 .18 1940 257.7 8.31 13 5.4 .04 .05 511 8240.3 275 3210 3.0 1.37 1.53 16340 41335 1333 12000 110 6.66 7.69 81990 3735 125 412 27 .62 .69 7410 1296 41.8 174 17 .21 .24 2570 3775 122 2010 15 .61 .70 7490 1639 54.6 509 11 .27 .30 3250 CAL YR 1985 WTR YR 1986 TOTAL TOTAL 193:96 171669.8 MEAN MEAN 531 470 MAX MAX 36100 36100 MIN MIN 10 3.0 CFSM CFSM 2.65 2.35 IN. IN. 36.05 31.93 AC-FT AC-FT 384400 340500 137 AN JUAN Droinage boundaries indeterminate in limestone terrone 147530 CATA 0 BAYA MO 219 04851V resa de Piedre,s Los Cur TRUJILL© ALTO Drainage boundary AGUAS BUENAS N Rio Grande de CIDRA EXPLANATION 0476 QUALITY—OF WATER STATION AND NUMBER • 220 WELL AND WELL NUMBER AGVADILLA BARE KILOMETERS AYAGUEZ Figure 17.--Rio Hondo to the Rio Puerto Nuevo basins. RIO HONDO BASIN 50047530 RIO HONDO AT FLOOD CHANNEL NEAR CATANO, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°26'13", long 66°09'36", at Rio Hondo Channel, 800 ft (245 m) below junction with Rio Hondo, 0.9 mi (1.5 km) downstream from bridge on de Diego Expressway and 1.1 mi (1.8 km) above mouth. DRAINAGE AREA.--Indeterminate. PERIOD OF RECORD.--Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLT- STREP- HARD- SPE- DIS- DEMAND, FORM, TOCOCCI NESS CIFIC SOLVED CHEM- FECAL, FECAL, HARD- NONCARB CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR NESS WATER DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. (MG/L TOT FLD DATE TIME ANCE ARD WATER 1TY SOLVED SATUR- LEVEL) (COLS./ PER AS MG/L AS (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) CAC03) CAC03 NOV 1985 12... 1000 11000 7.40 27.0 11 290 >600000 33000 1300 1100 DEC 27... 1400 18000 7.60 28.5 11 320 2400000 58000 FEB 1986 27... 1430 43400 7.60 31.0 7.2 0.2 3 1900 65000 <1000 MAY 16... 1015 13000 7.25 27.0 5.5 0.1 1 250 K9100000 77000 1000 860 JUL 28... 1240 14000 7.65 33.5 3.2 6.7 98 350 K120000 K17000 SEP 24... 1050 7200 7.45 30.0 10 0.3 4 130 K7600000 K160000 730 590 ALKA- SOLIDS, MAGNE- SODIUM POTAS- LINITY CHLO- FLUO- SILICA, SUM OF CALCIUM SLUM, SODIUM, AD- SLUM, WATER SULFATE RIDE, RIDE, DIS- CONSTI- DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- DIS- SOLVED TUENTS, SOLVED SOLVED SOLVED TION SOLVED FIELD TCTAL SOLVED SOLVED SOLVED (MG/L DIS- DATE (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L (MG/L AS SOLVED AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) AS F) SI02) (MG/L) NOV 1985 12... 100 250 2000 25 73 133 <0.5 490 3700 0.40 7.6 6700 DEC 27... 189 6200 -- FEB 1986 27... - 165 -- 19000 MAY 16... 110 180 1400 19 53 155 <0.5 480 2700 0.30 13 5000 JUL 28... 187 480C SEP 24... 60 140 1200 20 54 132 380 2500 0.30 11 4400 SOLIDS, NITRO- SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- GEN,AM- BARIUM, BORON, CADMIUM D1S- AT 105 GEN, GEN, GEN, GEN, MONIA + PHOS- TOTAL TOTAL TOTAL SOLVED DEG. C, NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC PHORUS, ARSENIC RECOV- RECOV- RECOV- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE DATE PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) AS P) AS AS) AS BA) AS B) AS CD) NOV 1985 12... 0.0 30 0.010 <0.100 4.20 2.6 6.8 1.20 2 100 910 1 DEC 27... 30 0.010 <0.100 9.90 4.1 14 <0.010 FEB 1986 27... 45 0.020 <0.100 4.70 1.60 -- MAY 16... 0.0 9 0.050 <0.100 4.20 2.7 6.9 1.30 2 100 630 1 JUL 28... 11 0.010 <0.100 7.10 3.9 11 2.10 SEP 24... 0.0 15 0.010 <0.100 4.40 2.6 7.0 1.70 K = non-ideal count 138 139 RIO HONDO BASIN 50047530 RIO HONDO AT FLOOD CHANNEL NEAR CATANO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 CHRO- MANGA- METHY- MIUM, COPPER, IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS CR) AS CU) AS FE) AS PO AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) NOV 1985 12... 29 50 560 3 450 0.30 <1 1 50 <0.010 4 1.4 DEC 27... FEB 1986 27... MAY 16... 37 30 670 7 460 0.30 <1 1 120 0.020 23 1.7 JUL 28... SEP 24... 140 RIO DE BAYAMON BASIN 50047600 RIO DE BAYAMON NEAR AGUAS BUENAS, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°14'39", long 66°08'39", at bridge on Highway 156, and 2.9 mi (4.7 km) west of Aguas Buenas plaza. DRAINAGE AREA.--18.5 sq mi (47.9 sq km). PERIOD OF RECORD.--Water years 1958-65, 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1985 24... 0950 137 151 7.60 23.5 52 19 4300 6700 DEC 09... 1445 30 243 8.00 23.5 14 <10 K7400 6000 FEB 1986 14... 1440 30 219 8.40 21.5 5.0 9.0 106 23 430 K1400 MAY 05... 1500 14 336 8.04 27.0 3.2 7.7 99 25 450 3500 JUL 15... 0910 31 219 7.76 24.0 220 7.7 93 14 50000 23000 SEP 04... 0940 31 263 7.70 24.5 34 7.8 97 36 K800 1500 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- HARD- NONCARB CALCIUM SLUM, SODIUM, AD- SLUM, WATER SULFATE RIDE, NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1985 24... 53 4 12 5.6 9.4 0.6 2.7 49 <0.5 11 12 DEC 09... 88 FEB 1986 14... 72 MAY 05... 120 6 28 11 13 0.5 2.1 109 <0.5 13 15 JUL 15... 77 SEP 04... 89 2 21 8.9 14 0.7 2.7 87 8.5 14 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1985 24... <0.10 16 98 36 51 0.360 0.040 0.400 0.080 0.52 DEC 09... 7 <0.010 0.800 0.030 0.67 FEB 1986 14... 3 <0.010 0.500 0.020 0.28 MAY 05... <0.10 27 170 6.5 3 <0.010 0.700 0.010 0.39 JUL 15... 187 0.760 0.040 0.800 0.090 0.41 SEP 04... <0.10 23 140 12 18 0.670 0.030 0.700 0.040 0.36 K = non-ideal count 141 RIO DE BAYAMON BASIN 50047600 RIO DE BAYAMON NEAR AGUAS BUENAS, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA 4. NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1985 24... 0.60 1.0 4.4 0.070 <1 <100 50 <1 5 10 DEC 09... 0.70 1.5 6.6 0.040 FEB 1986 14... 0.30 0.80 3.5 0.020 MAY 05... 0.40 1.1 4.9 0.030 <1 <100 50 <1 3 10 JUL 15... 0.50 1.3 5.8 0.070 SEP 04... 0.40 1.1 4.9 0.040 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELF- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS P6) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1985 24... 3500 2 150 <0.10 <1 <1 20 <0.010 <1 0.05 DEC 09... FEB 1986 14... MAY 05... 400 2 50 <0.10 <1 <1 <10 <0.010 <1 0.06 JUL 15... SEP 04... I 142 RIO DE RAYAMON BASIN 50047990 RIO GUAYNABO NEAR BAYAMON, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°22'32", long 66°07'59", at bridge on Highway 833, 0.2 i (0.3 km) upstream from Rio de Bayamon, and 2.3 mi (3.7 km) southeast of Bayamon plaza. DRAINAGE AREA.--73.2 sq mi (189.6 sq km). PERIOD OF RECORD.--Water years 1958, 1964, 1971-73, 1976, 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- 1CAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MGM 100 ML) 100 ML) OCT 1985 21... 1155 48 386 7.60 25.5 53 22 400000 4800 DEC 23... 1150 26 434 7.70 24.0 1.1 18 K8900 3100 FEB 1986 21... 1250 19 490 7.75 25.0 2.0 3.6 44 34 4000 400 APR 23... 1250 20 506 7.08 29.0 3.2 3.3 43 37 3000 710 JUL 22... 1230 20 460 7.40 29.0 4.5 4.1 53 35 20000 K700 SEP 22... 1350 19 523 7.52 29.5 2.5 3.5 46 35 K15000 1400 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- HARD- NONCARB CALCIUM SLUM, SODIUM, AD- SLUM, WATER SULFATE RIDE, NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1985 21... 140 4 37 11 22 0.8 3.7 134 <0.5 12 29 DEC 23... 160 FEB 1986 21... 156 APR 23... 160 7 44 13 30 1 4.5 156 <0.5 21 43 JUL 22... 160 SEP 22... 150 0 41 12 32 1 5.0 163 16 39 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1985 21... 0.20 24 220 28 101 0.530 0.070 0.600 1.00 0.90 DEC 23... 13 0.240 0.060 0.300 1.90 0.70 FEB 1986 21... 1 0.170 0.030 0.200 2.60 1.1 APR 23... 0.20 27 280 15 17 0.350 0.050 0.400 1.80 0.70 JUL 22... 3 0.240 0.060 0.300 2.40 0.70 SEP 22... 0.10 28 270 14 9 0.070 0.030 0.100 3.00 1.3 K = non-ideal count 143 RIO DE BAYAMON BASIN 50047990 RIO GUAYNABO NEAR BAYAMON, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1985 21... 1.9 2.5 11 0.400 1 100 60 <1 8 20 DEC 23... 2.6 2.9 13 0.710 FEB 1986 21... 3.7 3.9 17 0.950 APR 23... 2.5 2.9 13 0.750 2 200 10 <1 4 10 JUL 22... 3.1 3.4 15 1.30 SEP 22... 4.3 4.4 19 1.10 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CH) (UG/L) (MG/L) OCT 1985 21... 4700 3 420 <0.10 <1 <1 80 <0.010 1 0.21 DEC 23... FEB 1986 21... APR 23... 760 <1 460 0.10 <1 <1 20 <0.010 1 0.37 JUL 22... -- SEP 22... 144 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 sq mi (186.2 sq km). PERIOD OF RECORD.--Water years 1974 to current year. REMARKS.--Prior to 1979 sampling site was 0.8 mile (1.3 km) downstream but was changed because of flood channel construction. WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLI- STREP- SPE- D1S- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1985 24... 1315 E450 222 7.40 24.5 4300 26 37000 36000 DEC 27... 1000 34 442 7.80 23.0 7.0 5.8 <10 50000 2100 FEB 1986 21... 0955 35 458 7.60 23.0 2.1 4.6 54 50 48000 K1600 APR 23... 0940 42 485 7.24 26.0 20 4.4 54 17 K20000 40000 JUL 22... 0945 43 445 7.65 27.5 1.0 38 K85000 SEP 22... 1025 37 465 7.35 28.5 10 5.8 75 24 20000 HARD- ALKA- NESS MAGNE- SODIUM POTAS- UNITY CHLO- HARD- NONCARB CALCIUM SLUM, SODIUM, AD- SIUM, WATER SULFATE RIDE, NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED T1ON SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1985 24... 80 6 20 7.4 13 0.7 2.6 74 <0.5 16 15 DEC 27... 136 FEB 1986 21... 151 APR 23... 150 7 39 13 24 0.9 3.6 144 <0.5 19 34 JUL 22... 156 SEP 22... 150 0 40 13 28 1 4.1 158 20 31 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) S102) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1985 24... 0.10 20 140 E170 528 0.610 0.090 0.700 0.320 0.98 DEC 27... 6 0.410 0.090 0.500 1.40 0.60 FEB 1986 21... 9 0.290 0.110 0.400 2.00 0.80 APR 23... 0.20 24 240 27 48 0.470 0.130 0.600 1.20 0.70 JUL 22... 18 0.330 0.170 0.500 1.70 0.70 SEP 22... 0.10 27 260 26 19 0.110 0.090 0.200 2.20 0.70 E = estimate K = non-ideal count 145 RIO DE BAYAMON BASIN 50048510 RIO DE BAYAMON AT FLOOD CHANNEL AT BAYAMON, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS 8) AS CD) AS CR) AS CU) OCT 1985 24... 1.3 2.0 8.9 0.240 2 100 60 <1 15 40 DEC 27... 2.0 2.5 11 0.690 FEB 1986 21... 2.8 3.2 14 0.830 APR 23... 1.9 2.5 11 0.480 2 200 30 <1 20 10 JUL 22... 2.4 2.9 13 0.770 SEP 22... 2.9 3.1 14 0.910 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1985 24... 14000 5 450 <0.10 <1 <1 40 <0.010 <1 0.06 DEC 27... FEB 1986 21... APR 23... 2700 3 310 <0.10 <1 <1 20 <0.010 <1 0.11 JUL 22... SEP 22... PESTICIDE ANALYSES CHLOR- DI- DI- PCB, ALDRIN DANE, DDD, DDE, DDT, AZINON ELDRIN DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- DATE TIME SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUL 1986 22... 0945 <0.1 <0.010 <0.1 <0.010 <0.010 <0.010 0.14 <0.010 HEPTA- METH- ENDO- HEPTA- CHLOR MALA- OXY- SULFAN, ENDRIN, ETHION, CHLOR, EPDXIDE LINDANE THION, CHLOR, DATE DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUL 1986 22... <0.010 <0.010 <0.01 <0.010 <0.010 <0.010 <0.01 <0.01 NAPH- THA- METHYL METHYL LENES, PARA- TRI- PARA- POLY- PER- TOX- TRI- THION, THION, MIREX, THION, CHLOR. THANE APHENE, THION DATE DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUL 1986 22... <0.010 <0.010 <0.01 <0.010 <0.010 <0.10 <0.01 <1 RIO PUERTO NUEVO BASIN 50048800 RIO PIEDRAS NEAR RIO PIEDRAS, PR WATER-QUALITY RECORDS LOCATION.--Lat 18'22'15", long 66°03'40", at bridge on Winston Churchill Avenue in the El Senorial Housing area, 0.5 mi (0.8 km) west of Highway 176, and 2.5 mi (4.0 km) southwest of Rio Piedras plaza. DRAINAGE AREA.--8.17 sq mi (20.9 sq km). PERIOD OF RECORD.--Water years 1972 to current year. WATER QUALITY DATA, WATER YEAR OCTOBER 1985 TO SFPTEMBER 1986 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM= FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1985 15... 1400 12 382 7.80 26.0 20 K8600 K83 DEC 26... 0915 9.5 364 7.90 22.0 4.0 7.8 88 <10 K21000 2500 FEB 1986 14... 1030 6.2 377 7.60 24.0 15 13 4300 8000 APR 18... 1410 12 402 8.10 30.5 2.4 9.5 128 79 K95000 48000 JUL 18... 1110 5.5 386 7.55 29.0 5.7 75 K240000 K150000 SEP 12... 1115 6.7 417 7.65 26.0 2.0 6.4 80 51 >1000 K170000 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- HARD- NONCARB CALCIUM SLUM, SODIUM, AD- SLUM, WATER SULFATE RIDE, NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1985 15... 130 11 34 12 24 0.9 3.0 123 14 19 26 DEC 26... 113 26... 113 FEB 1986 14... 134 APR 18... 140 4 36 12 26 1 3.0 135 <0.5 15 29 JUL 18... 143 SEP 12... 140 0 36 11 27 1 3.6 142 24 27 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1985 15... 1.3 31 220 7.3 13 C.930 0.07) 1.00 0.340 0.36 DEC 26... - --1.15 0.050 1.20 0.290 0.31 26... 16 -- FEB 1986 14... 8 1.00 0.100 1.10 0.750 0.35 APR 18... 0.20 33 240 7.4 5 0.780 0.220 1.00 0.900 0.50 JUL 18... 0.600 0.100 0.700 1.40 0.90 SEP 12... 0.20 30 240 4.4 10 0.620 0.180 0.800 2.70 1.7 K = non-ideal count 146 147 RIO PUERTO NUEVO BASIN 50048800 RIO PIEDRAS NEAR RIO PIEDRAS, PR--Continued WATER QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1985 15... 0.70 1.7 7.5 0.240 30 10 DEC 26... 0.60 1.8 8.0 0.140 26... -- -- -- -- -- FEB 1986 14... 1.1' 2.2 9.7 0.280 APR 18... 1.4 2.4 11 0.330 6 200 10 <1 18 <10 JUL 18... 2.3 3.0 13 0.500 SEP 12... 4.4 5.2 23 1.50 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL. TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1985 15... 2200 170 50 <0.010 <1 0.19 DEC 26... 26... FEB 1986 14... APR 18... 270 3 190 <0.10 <1 <1 30 <0.010 2 0.27 JUL 18... SEP 12... PESTICIDE ANALYSES CHLOR- DI- DI- PCB, ALDRIN, DANE, ODD, DDE, DDT, AZINON, ELDRIN DATE 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) JUL 1986 18... 1110 <0.1 <0.010 <0.1 <0.010 <0.010 <0.010 0.12 <0.010 HEPTA- METH- ENDO- HEPTA- CHLOR MALA- OXY- SULFAN, ENDRIN, ETHION, CHLOR, EPDXIDE LINDANE THION, CHLOR, DATE TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUL 1986 18... <0.010 <0.010 <0.01 <0.010 <0.010 <0.010 0.01 <0.01 NAPH- THA- METHYL METHYL LENES, PARA- TRI- PARA- POLY- PER- TOX- TOTAL THION, THION, MIREX, THION, CHLOR. THANE APHENE, TRI­ DATE TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL THION (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUL 1986 18... <0.01 <0.01 <0.01 <0.01 <0.10 <0.1 <1 <0.01 RIO PUERTO NUEVO BASIN 50049100 RIO PIEDRAS AT HATO REY, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°24'34", long 66°04'101, at bridge on Avenida Piniero at Expreso Las Americas, and 0.8 mi (1.3 km) southwest of Hato Rey. DRAINAGE AREA.--15.4 sq mi (39.9 sq km). PERIOD OF RECORD.--Water years 1971 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLI- STREP- SPE- D1S- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- !CAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1985 15... 0945 17 422 7.60 26.5 2.7 17 K84000 4500 DEC 26... 1240 17 430 7.90 25.0 3.5 13 42000 20000 FEB 1986 14... 1330 16 485 7.70 25.5 17 29 430000 33000 APR 18... 1115 4.3 464 7.80 27.5 25 6.8 87 27 K130000 K11000 JUL 18... 0915 14 396 7.65 28.0 15 6.2 80 16 31000 K1300000 SEP 12... 0835 14 422 7.80 27.0 1.8 5.7 72 10 28000 3200 HARD- ALKA- NESS MAGNE- SODIUM POTAS- UNITY CHLO- HARD- NONCARB CALCIUM SIUM, SODIUM, AD- SIUM, WATER SULFATE RIDE, NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1985 15... 150 9 42 11 25 0.9 3.5 141 <0.5 22 27 DEC 26... 131 FEB 1986 14... 156 APR 18... 160 8 44 12 32 1 3.7 151 <0.5 17 37 JUL 18... 15 SEP 12... 150 5 44 10 26 1 3.5 146 25 29 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) 5102) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1985 15... 0.50 27 240 11 12 0.910 0.190 1.10 1.00 0.60 DEC 26... 4 1.10 0.100 1.20 0.610 0.49 FEB 1986 14... 5 1.18 0.220 1.40 1.10 0.90 APR 18... 0.20 31 270 3.1 5 1.05 0.350 1.40 0.920 0.58 JUL 18... 12 0.770 0.130 0.900 0.190 0.51 SEP 12... 0.20 26 250 9.5 3 0.940 0.160 1.10 0.260 0.64 K = non-ideal count 148 149 RIO PUERTO NUEVO BASIN 50049100 RIO PIEDRAS AT HATO REY, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N), AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1985 15... 1.6 2.7 12 0.340 1 200 60 3 8 10 DEC 26... 1.1 2.3 10 0.400 FEB 1986 14... 2.0 3.4 15 0.640 APR 18... 1.5 2.9 13 0.630 2 200 10 <1 7 20 JUL 18... 0.70 1.6 7.1 0.320 SEP 12... 0.90 2.0 8.9 0.430 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1985 15... 670 4 190 <0.10 <1 <1 40 <0.010 <1 0.13 DEC 26... FEB 1986 14... APR 18... 310 1 160 <0.10 <1 <1 10 <0.010 2 0.12 JUL 18... SEP 12... 150 RIO PUERTO NUEVO BASIN 50049820 LAGUNA SAN JOSE NO. 2 AT SAN JUAN, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°25'46", long 66°02'10", 0.2 mi (0.3 km) east of Cana de Martin Pena, and 650 ft (200 m) south of Isla Guachinango. DRAINAGE AREA.--Indeterminate. PERIOD OF RECORD.--Water years 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1985, TO SEPTEMBER 1986 DEPTH OXYGEN, COLI- STREP- ALKA­ AT SPE- TRANS- DIS- FORM, TOCOCCI LINITY SAMPLE CIFIC PAR- SOLVED FECAL, FECAL, WATER LOC- CON- PH TEMPER- ENCY OXYGEN, (PER- 0.7 KF AGAR TOTAL ATION, DUCT- (STAND- ATURE (SECCHI DIS- CENT UM-MF (COLS. FIELD DATE TIME TOTAL ANCE ARD WATER DISK) SOLVED SATUR- (COLS./ PER MG/L AS (FEET) (US/CM) UNITS) (DEG C) (IN) (MG/L) ATION) 100 ML) 100 ML) CAC03 NOV 1985 07... 1310 1.00 10100 8.80 31.0 12.5 14.1 5200 <100 114 DEC 27... 0900 1.00 14600 8.80 25.5 10.5 4.4 57 K96000 4400 128 FEB 1986 28... 0850 1.00 30700 8.24 23.0 15.0 2.2 29 K1100 <100 312 MAY 14... 1220 1.00 9500 8.80 27.5 7.20 8.2 108 45000 82 JUL 25... 0850 1.00 24400 8.45 30.0 14.8 0.7 10 200000 2400 136 SEP 25... 0915 1.00 26200 8.06 29.0 14.4 0.2 3 K13000 7500 147 SOLIDS, NITRO- RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- GEN,AM- AT 105 GEN, GEN, GEN, GEN, GEN, MONIA + NITRO-, NITRO- PHOS- CARBON, DEG. C, NITRATE NITRITE ND2+NO3 AMMONIA ORGANIC ORGANIC GEN, GEN, PHORUS, ORGANIC SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL DATE PENDED (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) AS NO3) AS P) AS C) NOV 1985 07... 23 0.030 <0.100 0.290 2.2 2.5 0.550 19 DEC 27... 43 0.040 <0.100 1.10 4.7 5.8 0.680 16 FEB 1986 28... 36 0.030 <0.100 1.10 3.3 4.4 0.950 22 MAY 14... 20 0.080 0.020 0.100 0.290 2.1 2.4 2.5 11 0.540 20 JUL 25... 34 0.020 <0.100 0.190 2.5 2.7 0.570 17 SEP 25... 32 0.010 <0.100 0.570 0.0 0.30 0.930 15 K = non-ideal count 151 RIO PUERTO NUEVO BASIN 50049920 BAHIA DE SAN JUAN NO. 5 AT SAN JUAN, PR WATER-QUALITY RECORDS LOCATION--Lat 18°26'37", long 66°05'11", 0.4 mi (0.6 km) west of Puente de la Constitucion, and 0.5 mi (0.8 km) south from U.S. Naval Reservation. DRAINAGE--Indeterminate. PERIOD OF RECORD--Water years 1974 to present. WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 WATER QUALITY DATA DEPTH OXYGEN, COLT- STREP- ALKA­ AT SPE- TRANS- DIS- FORM, TOCOCCI LINITY SAMPLE CIFIC PAR- SOLVED FECAL, FECAL, WATER LOC- CON- PH TEMPER- ENCY OXYGEN, (PER- 0.7 KF AGAR TOTAL ATION, DUCT- (STAND- ATURE (SECCHI DIS- CENT UM-MF (COLS. FIELD DATE TIME TOTAL ANCE ARD WATER DISK) SOLVED SATUR- (COLS./ PER MG/L AS (FEET) (US/CM) UNITS) (DEG C) (IN) (MG/L) ATION) 100 ML) 100 ML) CAC03 NOV 1985 07... 1515 1.00 38200 8.00 31.0 26.3 3.8 K15000 K500 126 DEC 27... 1035 1.00 41800 8.10 25.5 36.0 5.2 74 K28000 K400 127 FEB 1986 28... 1135 1.00 44000 7.85 29.0 11.0 3.8 58 K15000 <100 107 MAY 14... 1415 1.00 11100 7.60 26.5 7.20 4.2 54 57000 97 JUL 25... 1040 1.00 12800 7.35 30.0 22.3 5.3 73 K98000 8000 108 SEP 25... 1050 1.00 45000 7.59 29.5 34.8 2.1 32 K110000 K17000 133 SOLIDS, NITRO- RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- GEN,AM- AT 105 GEN, GEN, GEN, GEN, GEN, MONIA + NITRO- NITRO- PHOS- CARBON, DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, GEN, PHORUS, ORGANIC SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL DATE PENDED (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) AS NO3) AS P) AS C) NOV 1985 07... 89 0.070 0.030 0.100 1.10 0.20 1.3 1.4 6.2 0.160 5.0 DEC 27... 76 0.160 0.040 0.200 1.10 0.20 1.3 1.5 6.6 0.180 3.1 FEB 1986 28... 77 0.070 0.030 0.100 0.770 0.43 1.2 1.3 5.8 0.190 4.7 MAY 14... 70 0.260 0.040 0.300 0.680 0.82 1.5 1.8 8.0 0.280 11 JUL 25... 16 0.310 0.090 0.400 0.880 0.62 1.5 1.9 8.4 0.290 7.5 SEP 25... 39 0.030 <0.100 1.10 0.70 1.8 0.310 5.1 K = non-ideal count 153 SAN JUAN OC EAN Laguna V LO1ZA ALDEA Son Jose Coastal basin Coastal basin AR LINA RIO GRANDE A OVA N ▪AS TRUJI O ALTO Drainage boundary Espiritu Santo basin ago Lolia Rio 0554 AGUAS BUENAS ▪CAGUAS LAS PIEDRAS Anton Ruiz basin 05O50 051180 051150 Dronoge boundary Rio de la Plata basin Rio Humacao basin EXPLANATION A0509 SURFACE—WATER STATION AND NUMBER ,::•radide de PutiUds basin v0554 QUALITY—OF—WATER STATION AND NUMBER ).MAYAGUEZ Map area JUAPe 04iPt cierauA0 0• Rio Guayones basin 3 4 5 KILOMETERS v0588 .222 QUALITY—OF—WATER PARTIAL RECORD STATION AND NUMBER WELL AND WELL NUMBER C • GUAYANA. 1 5 MILES Figure 18.--Rio Grande de Loiza basin. 154 RIO GRANDE DE LOIZA BASIN 50050300 QUEBRADA BLASINA NEAR CAROLINA, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°23'27", long 65°58'28", at bridge on Highway 3, 1.4 mi (2.3 km) south of Valle Arriba Heights housing area, and 1.2 mi (1.9 km) west-southwest of Carolina plaza. DRAINAGE AREA.--2.96 sq mi (7.67 sq km). PERIOD OF RECORD.--Water years 1973 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1985 29... 1335 2370 111 6.70 28.0 850 7,8 99 69 K1100000 43000 DEC 11... 1500 E250 250 7.90 26.0 40 7.8 96 <10 K150000 340 FEB 1986 03... 1150 92 263 8.00 23.5 15 7.9 93 23 K9500 K1500 APR 16... 1300 63 278 7.70 28.0 15 7.5 97 28 25000 K170 JUL 15... 1055 113 211 7.65 28.5 27 7.6 99 18 K16000 440 SEP 09... 1120 76 241 7.65 30.0 21 7.6 101 <10 20000 200 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- HARD- NONCARB CALCIUM SIUM, SODIUM, AD- SIUM, WATER SULFATE RIDE, NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1985 29... 29 0 6.5 3.0 8.0 0.7 1.0 29 <0.5 7.3 7.5 DEC 11... 64 FEB 1986 03... 78 APR 16... 77 0 18 7.8 23 1 2.4 80 <0.5 15 23 JUL 15... 68 SEP 09... 71 0 17 7.0 21 1 2.2 76 14 16 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1985 29... <0.10 18 69 439 708 0.270 0.130 0.400 0.260 1.6 DEC 11... 62 0.370 0.030 0.400 0.070 0.33 FEB 1986 03... 34 0.450 0.050 0.500 0.140 0.46 APR 16... 0.10 32 170 29 22 0.600 0.100 0.700 0.410 0.59 JUL 15... 18 0.260 0.040 0.300 0.130 0.37 SEP 09... 0.20 35 160 32 22 0.330 0.070 0.400 0.140 0.36 K = non-ideal count RIO GRANDE DE LOIZA BASIN 50050300 QUEBRADA BLASINA NEAR CAROLINA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1985 29... 1.9 2.3 10 0.370 1 200 50 1 14 50 DEC 11... 0.40 0.80 3.5 0.090 FEB 1986 03... 0.60 1.1 4.9 0.210 APR 16... 1.0 1.7 7.5 0.310 <1 <100 10 <1 1 30 JUL 15... 0.50 0.80 3.5 0.140 SEP 09... 0.50 0.90 4.0 0.200 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1985 29... 19003 17 740 0.10 <1 <1 70 <0.010 <1 0.04 DEC 11... FEB 1986 03... APR 16... 940 1 260 0.10 <1 <1 20 <0.010 3 0.15 JUL 15... -- SEP 09... 155 I I I 156 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 Emajagua and about 7.1 mi (11.4 km) southwest of San Lorenzo. DRAINAGE AREA.--6.00 mi' (15.54 km2 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--October 1977 to current year. GAGE.--Water-stage recorder. Elevation of gage is 175 ft (53 ), from topographc map. REMARKS.--No estimated daily discharges during water year. Records fair. AVERAGE DISCHARGE.--9 years (1978-86), 31.1 ft'is (0.881 '/s), 70.39 in/yr (1,788 m/yr), 22,530 acre-ft/yr (27.78 he/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 11,700 ft'A (331 m'/s), Nov. 5, 1983, gage height, 14.78 ft (4.505 m), from rating curve extended above 500 ft'is (14.2 m'/s) on basis of step-backwater analysis; minimum discharge, 2.8 ft'/s (0.079 m 3 /s), May 5, 6, 1979. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 2,000 ft'is (56.6 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (W/s) (m 3 /s) (ft) (m) Date Time (ft'/s) (80/s) (ft) (m) Oct. 6 1015 *3,850 109 *10.01 3.051 May 18 1115 2,950 83.5 9.21 2.807 Oct. 24 0815 2,040 57.8 8.25 2.515 May 31 0400 2,640 74.8 8.90 2.713 Apr. 29 1515 2,910 82.4 9.17 2.795 June 10 0130 2,150 60.9 8.37 2.551 May 13 0830 3,020 85.5 9.28 2.828 Minimum discharge, 6.5 ft'is (0.184 m'/s), Mar. 23, 24. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1905 TO SEPTEMBER 1986 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 2 3 4 5 76 43 63 71 80 58 44 38 33 32 16 15 15 14 18 13 13 15 19 13 11 9.7 13 16 16 8.5 7.9 7.8 8.6 9.6 22 16 15 60 40 20 16 19 16 13 28 30 26 22 22 16 14 14 13 13 9.9 9.4 9.0 10 9.3 15 13 11 11 22 6 7 8 9 10 1250 470 151 83 64 30 27 25 24 23 17 15 14 14 15 12 11 11 45 20 11 10 9.8 9.1 8.9 8.6 8.5 7.7 7.6 7.4 23 16 20 16 12 41 41 50 25 205 22 20 20 49 214 23 17 13 12 11 8.5 17 16 9.7 9.2 12 10 9.6 9.3 8.7 11 12 13 14 15 51 43 37 34 32 22 43 34 26 27 14 23 16 14 14 16 14 12 12 11 9.0 9.0 8.6 8.3 8.3 8.3 8.1 11 14 14 11 11 11 11 10 91 31 197 138 36 27 23 32 27 26 15 17 12 12 15 30 12 34 19 12 8.0 8.0 9.4 8.5 7.9 16 17 18 19 20 30 46 60 36 29 26 28 83 29 29 14 14 13 15 16 11 16 15 12 12 8.3 9.1 9.1 36 18 9.2 8.2 7.7 7.3 7.4 9.9 9.4 8.7 8.5 8.7 28 43 245 52 3/ 25 21 18 42 21 13 11 11 10 9.8 11 9.8 9.2 8.8 8.5 7.6 7.3 7.0 7.1 7.0 21 22 23 24 25 28 27 139 236 79 24 21 20 19 18 13 13 14 17 15 17 12 12 26 15 11 9.8 9.2 9.0 9.4 7.1 7.0 6.9 7.0 7.0 8.8 9.6 8.3 8.5 8.3 47 62 34 29 26 18 17 16 16 15 11 9.7 9.7 9.1 9.1 7.8 7.9 8.0 9.5 9.5 6.9 9.9 13 55 40 26 27 28 29 30 31 160 66 45 167 54 70 17 17 17 16 17 --- 14 13 13 12 12 11 12 11 11 11 11 11 8.8 8.6 8.7 --- 10 9.9 11 197 26 27 8.7 9.6 33 226 37 --- 25 25 24 58 25 172 15 18 16 14 13 --- 1.2 9.8 9.0 8.6 18 11 7.9 7.4 89 280 22 20 24 13 11 9.8 9.0 --- TOTAL MEAN MAX MIN CFSM IN. AC-FT 3820 123 1250 27 20.5 23.68 7580 867 28.9 83 16 4.82 5.38 1720 453 14.6 23 11 2.43 2.81 899 452 14.6 45 11 2.43 2.80 897 312.7 11.2 36 8.3 1.87 1.94 620 493.3 15.9 197 6.9 2.65 3.06 978 697.0 23.2 226 8.3 3.87 4.32 1380 1871 60.4 245 13 10.1 11.60 3710 873 29.1 214 13 4.85 5.41 1730 386.0 12.5 23 8.6 2.08 2.39 766 731.3 23.6 280 7.4 3.93 4.53 1450 391.0 13.0 55 6.9 2.17 2.42 776 CAL YR 1985 WTR YR 1986 TOTAL TOTAL 12865.5 11347.3 MEAN MEAN 35.2 31.1 MAX MAX 1250 1250 MIN MIN 7.5 6.9 CFSM CFSM 5.87 5.18 IN. IN. 79.77 70.35 AC-FT AC-FT 25520 22510 157 RIO GRANDE DE LOIZA BASIN 50050900 RIO GRANDE DE LOIZA AT QUEBRADA ARENAS, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS AUGUST 1981 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) DEC, 03 1228 15 148 24.5 SEP, 16 1206 8.0 160 28.0 AUG, 20 1304 8.5 157 28.5 I 158 RIO GRANDE DE LOIZA BASIN 50051150 QUEBRADA BLANCA AT EL JAGUAL, PR LOCATION.--Lat 18°09'40", long 65°58'58", Hydrologic Unit 21010005, 0.1 mi (0.2 km) upstream from bridge on Highway 181, and 2.8 mi (4.5 km) southwest of San Lorenzo. DRAINAGE AREA.--3.25 Si' (8.42 km?). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--October 1984 to current year. GAGE.--Water-stage recorder. Elevation of gage is 459 ft (140 ), from topographic map. REMARKS.--Estimated daily discharges: Oct. 8-11, Oct. 19 to Nov. 6, Nov. 25 to Dec. 2 and Sept. 15-29. Records fair except those for estimated daily discharges, which are poor. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 7,400 ft'is (210 m'/s), May 17, 1985, gage height, 14.58 ft (4.444 m), from floodmark, from rating curve extended above 400 ft'is (11.3 m'/s) on basis of step-backwater analysis and slope-area measurement; minimum discharge, 0.46 ft'/s (0.013 80/s), May 8, 1985. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,000 ft'is (28.3 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (m0/s) (ft) (m) Date Time (W/s) (e/s) (ft) (m) Oct. 6 2330 1,690 47.9 9.24 2.816 May 13 0815 *3,180 90.0 *11.10 3.383 May 8 1645 2,600 73.6 10.39 3.167 May 13 2400 2,610 73.9 10.41 3.173 Minimum discharge, 1.2 ft'is (0.034 m'/s), Apr. 23-26. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 6.3 15 4.8 3.8 4.0 2.1 2.3 5.9 3.7 1.8 1.9 3.1 2 15 10 4.6 3.8 3.1 2.1 1.8 2.6 3.8 1.8 1.9 2.3 3 11 8.6 4.6 3.5 3.3 2.0 2.0 2.1 3.0 1.9 1.9 1.8 4 23 8.0 4.4 3.6 5.6 1.8 5.3 1.9 2.5 1.8 1.9 1.7 5 31 10 7.1 3.3 4.5 1.8 5.3 1.8 2.2 1.8 2.0 1.6 6 434 8.0 5.5 3.1 3.5 1.8 3.6 2.2 2.1 3.5 2.0 1.6 7 237 7.2 4.8 3.1 3.2 1.7 2.3 3.6 2.1 2.2 2.7 1.5 8 70 6.7 4.4 3.3 2.9 1.7 3.2 121 2.3 1.9 2.5 1.4 9 20 6.5 4.4 13 2.8 1.7 2.9 20 3.0 1.8 2.1 1.4 10 15 6.2 4.9 5.0 2.7 1.7 2.0 43 12 1.8 3.6 1.4 11 11 6.1 5.0 3.7 2.8 1.8 1.8 47 2.5 2.5 4.4 1.3 12 10 17 5.4 3.3 2.7 1.7 1.7 13 2.2 2.4 2.5 1.3 13 9.0 9.3 4.4 3.1 2.6 1.9 1.6 161 4.3 1.9 4.3 1.5 14 7.9 8.3 4.2 2.9 2.5 2.1 1.5 78 4.7 2.4 3.5 1.4 15 7.1 32 4.2 2.9 2.4 3.4 1.6 7.3 3.2 2.1 2.4 1.3 16 6.9 15 4.0 2.8 2.4 1.8 1.7 4.7 3.0 1.9 2.1 1.4 17 6.9 14 3.9 4.7 2.5 1.6 1.6 4.0 3.0 1.8 1.9 1.3 18 49 48 4.0 3.2 2.7 1.5 1.4 17 2.4 1.8 1.8 1.4 19 110 15 4.0 2.8 2.7 1.5 1.4 6.8 2.7 1.9 1.8 1.3 20 10 13 4.3 2.6 2,4 1.5 1.6 4.6 2.2 2.0 1.6 1.3 21 8.0 15 4.0 2.8 2.4 1.4 1.6 4.0 2.1 2.2 1.6 1.4 22 7.0 9.1 3.8 2.6 2.2 1.4 1.4 3.7 2.0 1.9 1.8 1.5 23 70 8.0 3.8 2.5 2.2 1.4 1.3 2.8 1.9 1.8 2.1 1.7 24 80 7.0 3.9 2.7 2.2 1.4 1.3 2.5 1.9 1.8 1.9 12 25 40 6.4 3.9 2.4 2.2 1.6 1.3 2.2 1.8 1.8 1.8 8.0 26 45 6.0 3.7 2.3 2.2 1.9 1.3 2.2 1.8 7.8 1.8 3.5 27 25 5.6 3.6 2.2 2.1 1.6 1.6 2.1 1.8 1.8 1.8 2.5 28 19 5.4 3.7 2.2 2.2 1.4 2.4 2.1 1.8 1.9 5.9 1.8 29 34 5.0 3.5 6.3 --- 4.6 35 2.6 1.8 1.8 77 1.7 30 20 5.4 3.4 3.4 2.3 5.1 2.1 1.8 2.5 4.1 1.8 31 45 --- 3.4 9.2 2.1 --- 26 --- 2.2 2.5 --- TOTAL 1483.1 336.8 133.6 116.1 79.0 58.3 98.9 599.8 85.6 62.5 151.1 67.2 MEAN 47.8 11.2 4.31 3.75 2.82 1.88 3.30 19.3 2.85 2.02 4.87 2.24 MAX 434 48 7.1 13 5.6 4.6 35 161 12 3.5 77 12 MIN 6.3 5.0 3.4 2.2 2.1 1.4 1.3 1.8 1.8 1.8 1.6 1.3 CFSM 14.7 3.45 1.33 1:15 .87 .58 1.02 5.94 .88 .62 1.50 .69 IN. 16.98 3.86 1.53 1.33 .90 .67 1.13 6.87 .98 .72 1.73 .77 AC-FT 2940 668 265 230 157 116 196 1190 170 124 300 133 CAL YR 1985 TOTAL 3895.48 MEAN 10.7 MAX 434 MIN .51 CFSM 3.29 IN. 44.59 AC-FT 7730 WTR YR 1986 TOTAL 3272.0 MEAN 8.96 MAX 434 MIN 1.3 CFSM 2.76 IN. 37.45 AC-FT 6490 159 RIO GRANDE DE LOIZA BASIN 50051150 QUEBRADA BLANCA AT EL JAGUAL, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--JANUARY 1985 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) DEC, 03 1014 4.7 256 24.0 RIO GRANDE DE LOIZA BASIN 50051180 QUEBRADA SALVATIERRA NEAR SAN LORENZO, PR LOCATION.--Lat 18°10'24", long 65°58'38", 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. DRAINAGE AREA.--3.74 mi' (9.69 km 2 ). 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.--Estimated daily discharges: Oct. 8-22, Apr. 12-15 and Aug. 31 to Sept. 22. REcords fair except those for estimated daily dicharges, which are poor. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 9,320 ft'A (264 m 3/s), May 17, 1985, gage height, 17.10 ft (5.212 a), from floodmark, from rating curve extended above 200 ft'is (5.66 10/s) on basis of step-backwater analysis and slope-area measurement; minimum discharge, 0.69 ft'is (0.020 10/s), Apr. 9-13, 15, 16, 1984. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,000 ft'/s (28.3 80/s) Discharge Discaarge Date Gage height Time (W/s) (10/s) Date (ft) (m) Time (ft'/s) (e/s) and maximum (*): Gage height (ft) (m) Oct. 6 1045 1,980 56.1 10.39 3.167 May 13 0815 *4,070 115 *13.17 4.014 May 8 1645 1,450 41.1 9.37 2.856 May 14 0U15 1,480 41.9 9.43 2.874 Minimum discharge, 1.0 ft'is (0.028 m 3/s), July 23-26, Aug. 4-7, 22, 27, 28. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 5.1 15 2.9 3.0 3.4 1.3 1.8 2.9 6.2 1.7 1.4 3.5 2 7.3 9.6 2.8 3.3 2.4 1.3 1.4 1.9 5.8 1.7 1.5 2.0 3 9.2 7.6 3.4 2.7 2.7 1.1 2.7 1.7 5.2 2.2 1.2 1.8 4 16 6.5 4.2 3.0 2.4 1.2 2.6 1.6 3.7 1.6 1.1 1.7 5 28 8.4 6.8 2.6 2.4 1.4 6.2 1.5 3.2 1.5 1.0 3.0 6 353 6.5 5.8 2.5 2.0 1.3 3.3 2.6 2.8 3.0 1.1 2.0 7 143 5.3 4.9 2.4 2.0 1.3 1.7 6.3 2.8 1.9 1.8 1.7 8 26 4.8 4.2 2.6 1.9 1.2 4.4 74 2.7 1,5 2.2 1.5 9 20 4.4 4.1 10 1.8 1.2 2.4 15 13 1.4 1.5 1.3 10 13 4.3 4.1 5.5 1.8 1.2 1.5 27 34 1.4 2.8 1.2 11 10 4.2 4.4 3.6 1.9 1.3 1.4 32 4.1 1.7 7.5 1.3 12 8.0 16 4.2 2.9 1.9 1.2 1.3 12 3.2 2.0 2.2 1.1 13 6.6 7.9 3.7 2.8 1.7 1.4 1.5 146 9.2 1.4 8.6 1.5 14 5.8 12 3.5 2.6 1.6 1.5 1.3 100 9.6 1.5 4.7 1.2 15 5.4 72 3.6 2.5 1.6 5.8 1.2 15 4.1 1.7 2.3 1.1 16 5.0 22 3.5 2.4 1.6 1.8 1.5 7.8 3.7 1.4 1.7 1.2 17 5.2 14 3.3 7.2 1.7 1.5 1.6 5.5 3.1 1.4 1.4 1.2 18 10 56 3.4 3.3 1.8 1.4 1.2 26 2.6 1.4 1.3 1.1 19 5.6 13 3.4 2.6 1.7 1.4 1.2 12 3.2 1.2 1.3 1.1 20 5.2 9.6 3.7 2.5 1.5 1.3 1.2 7.2 2.4 1.3 1.2 1.1 21 5.0 22 3.2 2.6 1.5 1.3 1.3 5.6 1.9 1.5 1.1 1.2 22 4.9 7.3 3.0 2.4 1.4 1.3 1.2 4.8 1.7 1.2 3.0 1.1 23 86 5.6 3.2 2.0 1.4 1.3 1.2 4.0 1.8 1.1 1.7 1.7 24 94 4.6 3.5 2.1 1.4 1.3 1.2 3,3 2.1 1.1 1.4 12 25 40 4.1 3.3 2.0 1.4 1.6 1.2 3.1 1.8 1.2 2.1 9.7 26 45 3.8 3.1 1.9 1.4 2.0 1.2 2.9 1.8 1.1 1.2 3.9 27 30 3.5 2.8 1.8 1.3 1.5 1.7 2.7 1.8 1.3 1.1 3.0 28 19 3.3 2.8 1.8 1.4 1.3 3.3 2.6 1.8 1.5 3.8 2.0 29 34 3.1 2.6 2.9 --- 5.2 36 4.5 1.6 1.4 73 1.7 30 21 3.2 2.5 2.3 1.8 6.9 3.4 1.6 2.7 5.9 1.6 31 57 --- 2.5 11 1.7 --- 26 --- 1.9 2.5 --- TOTAL 1123.3 359.6 112.4 102.8 51.0 51.4 96.6 560.9 142.5 48.9 144.6 69.5 MEAN 36.2 12.0 3.63 3.32 1.82 1.66 3.22 18.1 4.75 1.58 4.66 2.32 MAX 353 72 6.8 11 3.4 5.8 36 146 34 3.0 73 12 MIN 4.9 3.1 2.5 1.8 1.3 1.1 1.2 1.5 1.6 1.1 1.0 1.1 CFSM 9.68 3.21 .97 .89 .49 .44 .86 4.84 1.27 .42 1.25 .62 IN. 11.17 3.58 1.12 1.02 .51 .51 .96 5.58 1.42 .49 1.44 .69 AC-FT 2230 713 223 204 101 102 192 1110 283 97 287 138 CAL YR 1985 TOTAL 3790.23 MEAN 10.4 MAX 400 MIN .89 CFSM 2.78 IN. 37.70 AC-FT 7520 WTR YR 1986 TOTAL 2863.5 MEAN 7.85 MAX 353 MIN 1.0 CFSM 2.10 IN. 28.48 AC-FT 5680 160 RIO GRANDE DE LOIZA BASIN 50051180 QUEBRADA SALVATIERRA NEAR SAN LORENZO, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS FEBRUARY 1984 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) DEC, 13 1446 4.4 378 25.0 161 I I I I I I I I I I 162 RIO GRANDE DE LOIZA BASIN 50051310 RIO CAYAGUAS AT CERRO GORDO, PR LOCATION.--Lat 18'09'13', long 65'57'20", Hydrologic Unit 21010005, at downstream side on bridge on Highway 912. at Barrio Cerro Gordo, 2.8 i (4.5 km) south of San Lorenzo. DRAINAGE AREA.--10.2 i' (26.4 km'). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--October 1977 to current year. GAGE.--Water-stage recorder and crest-stage gage. Elevation Lt gage is 490 ft (150 ), from topographic map. Prior to Oct. 1, 1983, at site 2,000 ft (610 ) downstream at different datum. REMARKS.--Estimated daily discharges: Dec. 25 to Jan. 21, May 1-9, May 21-30, June 1-9, Aug. 17-29 and Sept. 24 to Oct. 2. Records fair except those for estimated daily discharges, which are poor. AVERAGE DISCHARGE.--9 years (1978-86), 49.5 ft'/s (1.402 '/s), 65.90 in/yr (1,674 mm/yr), 35.860 acre-ft/yr (44.22 haP/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 13,200 ft'/s (374 m'/s), Aug. 31, 1979, gage height, 9.44 ft (2.877 ), site and datum then in use, fro rating curve extended above 1,000 ft 3/s m 3/s) on the basis of slope-area measurement; minimum discharge, 7.1 ft'/s (0.201 '/s), Feb. 4, May 3, 1981, Apr. 12, 13, 16, 17, 1983 EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 2.500 ft'/s (70.8 '/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (m 3/s) (ft) (m) Date Time (ft'/s) (60/s) (ft) (m) Oct. 6 1045 4.040 114 15.49 4.121 May 14 0145 2,510 71.1 13.24 4.036 Apr. 29 1545 4,110 116 15.59 4.752 May 18 1130 *4,190 119 *15.69 4.782 Minimum discharge, 11 ft'is (0.312 '/s), Apr. 25, 26. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 2 3 4 5 60 67 61 70 101 98 87 83 75 77 40 41 37 31 44 30 35 40 50 35 18 17 17 28 39 15 14 16 17 20 62 26 15 19 38 25 20 25 17 24 20 28 23 21 22 30 22 22 19 19 23 20 18 18 17 24 16 14 16 41 6 7 8 9 10 1530 664 171 76 58 65 61 59 56 56 45 39 36 37 38 27 25 30 74 60 20 18 19 18 19 19 17 15 16 16 31 16 28 58 16 38 40 48 22 254 20 18 16 28 217 65 35 23 20 19 16 33 51 20 26 19 17 15 16 14 11 12 13 14 15 45 48 49 37 30 59 84 88 68 84 35 60 42 38 40 30 22 21 25 23 21 19 16 19 18 18 17 25 27 37 13 14 16 15 15 208 65 346 495 62 21 16 29 39 52 46 37 24 26 37 61 22 42 51 25 13 13 19 24 15 16 17 18 19 20 35 55 68 51 35 72 67 141 66 64 39 33 31 34 36 27 41 27 20 19 18 21 22 63 31 16 14 14 15 16 15 15 15 15 14 38 28 591 88 37 55 40 29 35 28 27 25 25 21 22 18 17 16 15 15 17 17 18 19 18 21 22 23 24 25 38 37 360 644 173 59 48 44 42 40 33 35 46 53 35 30 24 19 23 18 20 18 17 15 15 16 15 15 15 14 15 15 14 16 13 30 60 30 26 24 23 21 19 17 16 27 20 19 20 18 14 15 16 15 14 17 23 45 70 50 26 27 28 29 30 31 120 117 105 277 124 150 41 41 39 39 44 --- 32 30 32 31 32 28 16 15 24 20 22 20 16 19 15 --- 20 16 13 174 51 27 13 18 45 693 81 --- 23 24 22 60 23 273 19 25 27 20 19 --- 18 21 24 21 63 38 13 12 80 200 59 36 30 17 15 14 13 --- TOTAL MEAN MAX MIN CFSM IN. AC-FT 5456 176 1530 30 17.3 19.90 10820 1947 64.9 141 39 6.36 7.10 3860 1163 37.5 60 28 3.68 4.24 2310 892 28.8 74 15 2.82 3.25 1770 596 21.3 63 15 2.09 2.17 1180 740 23.9 174 13 2.34 2.70 1470 1379 46.0 693 13 4.51 5.03 2740 3066 98.9 591 17 9.70 11.18 6080 963 32.1 217 16 3.15 3.51 1910 853 27.5 65 18 2.70 3.11 1690 998 32.2 200 12 3.16 3.64 1980 659 22.0 70 13 2.16 2.40 1310 CAL YR 1985 WTR YR 1986 TOTAL TOTAL 22203 18712 MEAN MEAN 60.8 51.3 MAX MAX 1890 1530 M1N MIN 15 12 CFSM CFSM 5.96 5.03 IN. IN. 80.98 68.24 AC-FT AC-FT 44040 37120 163 RIO GRANDE DE LOIZA BASIN 50051310 RIO CAYAGUAS AT CERRO GORDO, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS AUGUST 1981 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) DEC, 04 1301 34 128 24.0 SEP, 16 0955 17 141 26.0 AUG, 20 1010 15 140 27.0 I I I I 164 RIO GRANDE DE LOIZA BASIN 50053050 RIO TURABO AT BORINQUEN, PR LOCATION.--Lat 18°10'10", long 66°02'37", Hydrologic Unit 21010005, at right upstream end of bridge on Highway 765, 0.5 mi (0.8 ka) south of Villa Borinquen, and 7.3 i (11.7 km) upstream from Rio Grande de Loiza. DRAINAGE AREA.--7.89 mi' (20.44 km:). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--December 1983 to current year. GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 430 ft (131 r), from topographic map. REMARKS.--Estimated daily discharges: Oct. 6, 7, Feb. 16 to Mar. 11, Mar. 16-24, May 2-6, May 21 to June 9, July 13, 14 and Sept. 18-23. Records fair except those for estimated daily discharges, which are poor. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 11,600 ft'is (328 '/s), May 18 1985, gage height, 17.06 ft (5.200 ), from floodmark, from rating curve extended above 200 ft'is (5.66 10/s) on basis of step-backwater analysis and slope-area measurement; minimum discharge, 4.0 ft'is (0.113 '/s), May 6. 1985. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,500 ft',/s (42.5 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (W/s) (e/s) (ft) (m) Date Time (W/s) (e/s) (ft) (m) Oct. 6 1600 *6,160 174 *13.27 4.045 May 13 2345 3,700 105 10.95 3.338 May 8 1630 2,920 82.7 10.11 3.082 Aug 29 0115 1,700 48.1 8.47 2.582 Minimum daily discharge. 6.0 ft'is (0.170 m'/s), Mar. 22, 23. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 61 44 21 17 14 8.0 11 19 25 12 15 16 2 54 39 20 17 13 8.0 9.8 13 30 11 15 15 3 54 36 20 18 25 8.2 15 18 23 12 16 14 4 58 33 20 21 19 9.0 20 13 20 10 16 13 5 70 35 22 17 17 10 20 12 23 11 15 19 6 989 31 20 15 14 8.4 17 11 20 31 14 13 7 338 30 20 15 14 7.8 13 26 19 13 17 10 8 255 29 19 15 13 7.4 12 157 17 10 23 8.4 9 134 29 19 27 13 7.0 9.8 42 20 9.5 17 9.1 10 93 28 19 17 12 8.0 9.7 50 100 8.3 20 8.5 11 73 27 19 14 12 7.0 9.3 67 20 22 44 8.4 12 65 59 25 14 12 6.9 9.2 31 17 15 24 9.9 13 61 33 19 14 11 7.6 8.8 251 30 11 79 11 14 58 45 18 13 9.0 8.2 8.8 151 32 16 68 9.4 15 57 85 18 13 8.2 10 11 29 29 17 40 8.6 16 56 51 17 12 8.4 6.4 11 18 34 14 30 7.9 17 58 43 17 16 8.8 7.0 10 18 23 12 22 7.0 18 81 73 17 14 35 6.6 10 120 18 12 19 6.8 19 59 47 17 13 25 6.4 11 29 26 11 14 6.8 20 54 42 17 13 15 6.4 11 16 16 14 11 6.6 21 53 52 17 13 10 6.2 11 15 14 14 9.7 6.2 22 52 34 16 11 9.2 6.0 13 60 14 8.4 17 6.6 23 152 30 16 8.9 8.8 6.0 11 30 13 9.8 14 8.0 24 131 27 18 12 8,4 7.0 11 26 12 12 18 57 25 85 25 18 9.0 9.0 9.1 11 24 11 13 10 31 26 137 24 17 8.5 8.4 9.6 11 23 11 9.0 8.6 16 27 82 23 16 7.3 8.6 8.7 13 24 12 14 6.8 11 28 67 21 17 7.6 8.4 8.8 17 22 12 17 67 9.5 29 95 21 16 18 --- 26 75 56 12 12 270 8.3 30 60 22 15 13 13 48 22 11 14 27 9.2 31 60 --- 15 16 12 --- 90 --- 16 20 --- TOTAL 3702 1118 565 439.3 369.2 266.7 458.4 1483 664 411.0 987.1 371.2 MEAN 119 37.3 18.2 14.2 13.2 8.60 15.3 47.8 22.1 13.3 31.8 12.4 MAX 989 85 25 27 35 26 75 251 100 31 270 57 MIN 52 21 15 7.3 8.2 6.0 8.8 11 11 8.3 6.8 6.2 CFSM 15.1 4.73 2.31 1.80 1.67 1.09 1.94 6.06 2.80 1.69 4.03 1.57 IN. 17.45 5.27 2.66 2.07 1.74 1.26 2.16 6.99 3.13 1.94 4.65 1.75 AC-FT 7340 2220 1120 871 732 529 909 2940 1320 815 1960 736 CAL YR 1985 TOTAL 12044.8 MEAN 33.0 MAX 1300 MIN 4.8 CFSM 4.18 IN. 56.79 AC-FT 23890 WTR YR 1986 TOTAL 10834.9 MEAN 29.7 MAX 989 MIN 6.0 CFSM 3.76 IN. 51.08 AC-FT 21490 165 RIO GRANDE DE LOIZA BASIN 50053050 RIO TURABO AT BORINQUEN, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS JANUARY 1985 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) DEC, 04 0955 20 153 22.5 I I I I I I 166 RIO GRANDE DE LOIZA BASIN 50055000 RIO GRANDE DE LOIZA AT CAGUAS, PR LOCATION .--Lat 18°14'33', long 66°00'34", Hydrologic Unit 21010005, on right bank 250 ft (16 ) upstream from bridge on Highway 189, 1.2 mi (1.9 km) downstream from Rio Turabo, and 1.8 i (2.9 km) east of Plaza de Caguas. DRAINAGE AREA.--89.8 mil (232.6 km 2). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--1959 (low-flow measurement only), February to November 1959 (monhly measurements only), December 1959 to current year. GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 143.28 ft (43.672 m) above mean sea level. REMARKS.--Estimated daily discharges: Jan. 7-12. Records fair except those for paints of estimated daily discharges, which are poor. AVERAGE DISCHARGES.--26 years (1961-86), 224 ftys (6.344 m'/s), 33.81 in/yr (860 mm/yr), 162,300 acre-ft/yr (200 hm'/yr); median of yearly mean discharges, 215 ft'is (6.09 '/s), 156,000 acre-ft/yr (192 hm0/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 71,500 ft'is (2,020 '/s), Sept. 6, 1960, gage height, 31.17 ft (9.501 ), from rating curve extended above 6,000 ft'/s (170 '/s) on basis of slope-area measurement; minimum daily discharge, 10 ft'/s (0.283 m'/s), Apr. 5, 10, 29, 1968. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 8,000 ft'is (227 le/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (41 3/s) (ft) (m) Date Time (ft'/s) (m)/s) (ft) (m) Oct. 6 2400 *22,800 646 *19.80 6.035 May 13 0945 16,700 473 16.75 5.105 Apr. 29 1715 9,900 280 13.90 4.237 May 18 1330 8,480 240 13.17 4.014 May 8 1730 14,520 411 15.91 4.849 Minimum discharge, 27 ft'is (0.765 m3/s), Apr. 25, 26. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 329 456 185 117 101 61 142 278 222 103 76 165 2 411 376 176 147 78 54 97 144 177 103 83 247 3 379 334 172 128 98 51 110 102 203 103 67 117 4 461 308 164 156 143 53 238 98 160 93 66 101 5 749 314 202 140 182 65 226 95 132 88 65 143 6 8560 285 198 115 100 64 198 160 118 179 54 109 7 7600 258 180 105 83 57 98 545 115 129 61 99 8 2190 244 161 200 79 48 162 1980 135 98 146 83 9 908 238 164 450 80 51 193 630 363 85 68 78 10 672 226 165 190 68 51 83 1060 946 80 62 75 11 530 221 167 150 67 57 61 1310 203 118 218 65 12 447 335 193 120 71 64 52 308 160 155 113 61 13 396 447 180 110 72 69 48 2870 249 100 131 64 14 363 457 157 100 61 84 44 1320 280 100 241 84 15 338 1630 153 100 66 195 51 457 179 121 115 55 16 323 581 146 96 60 100 87 292 245 121 82 46 17 398 352 135 156 60- 64 57 238 194 95 63 41 18 675 1270 138 140 77 54 37 1940 168 89 55 34 19 455 391 147 104 105 48 33 482 222 81 52 29 20 319 358 153 87 113 46 93 296 114 77 46 29 21 297 893 136 105 76 44 62 266 147 90 43 31 22 289 310 133 102 65 39 39 289 132 75 46 37 23 2020 273 130 89 70 36 42 206 126 67 115 61 24 2760 253 140 109 58 37 33 180 126 65 94 549 25 1060 234 130 122 58 35 32 160 103 69 81 350 26 1450 223 132 88 58 61 28 150 103 66 58 211 27 807 215 117 78 58 57 39 138 126 55 49 130 28 512 204 118 76 59 40 124 132 121 76 136 89 29 1260 197 113 94 --- 480 1830 180 108 66 2940 63 30 552 194 111 102 180 460 163 100 99 316 54 31 944 --- 105 95 108 --- 1040 --- 136 215 --- TOTAL 38454 12077 4701 3971 2266 2453 4799 17509 5841 2992 5957 3300 MEAN 1240 403 152 128 80.9 79.1 160 565 195 96.5 192 110 MAX 8560 1630 202 450 182 480 1830 2870 946 179 2940 549 MIN 289 194 105 76 58 35 28 95 100 65 43 29 CFSM 13.8 4.49 1.69 1.43 .90 .88 1.78 6.29 2.17 1.07 2.14 1.22 IN. 15.93 5.00 1.95 1.65 .94 1.02 1.99 7.25 2.42 1.24 2.47 1.37 AC-FT 76270 23950 9320 7880 4490 4870 9520 34730 11590 5930 11820 6550 CAL YR 1985 TOTAL 123626 MEAN 339 MAX 10400 MIN 23 CFSM 3.78 IN. 51.21 AC-FT 245200 WTR YR 1986 TOTAL 104320 MEAN 286 MAX 8560 MIN 28 CFSM 3.18 IN. 43.21 AC-FT 206900 RIO GRANDE DE LOIZA BASIN 50055000 RIO GRANDE DE LOIZA AT CAGUAS, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORD.--Water years 1959 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1985 29... 1335 2310 111 6.70 28.0 850 7.8 99 69 54000 43000 DEC 11... 1500 E250 250 7.90 26.0 40 7.8 96 <10 K150000 340 FEB 1986 03... 1150 92 263 8.00 23.5 15 7.9 93 23 K9500 K1500 APR 16... 1300 63 218 7.70 28.0 15 7.5 97 28 25000 K170 JUL 15... 1055 113 211 7.65 28.5 27 7.6 99 18 K16000 440 SEP 09... 1120 76 241 7.65 30.0 21 7.6 101 <10 20000 200 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- HARD- NONCARB CALCIUM SIUM, SODIUM, AD- SLUM, WH WAT SULFATE RIDE, NESS WH WAT DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1985 29... 29 0 6.5 3.0 8.0 0.7 1.0 29 <0.5 7.3 7.5 DEC 11... 64 FEB 1986 03... 78 APR 16... 77 0 18 7.8 23 1 2.4 80 <0.5 15 23 JUL 15... -- 68 SEP 09... 71 0 17 7.0 21 1 2.2 76 14 16 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE 0.1G/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) 5102) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1985 29... <0.10 18 69 439 708 0.270 0.130 0.400 0.260 1.6 DEC 11... 62 0.370 0.030 0.400 0.070 0.33 FEB 1986 03... 34 0.450 0.050 0.500 0.140 0.46 APR 16... 0.10 32 170 29 22 0.600 0.100 0.700 0.410 0.59 JUL 15... 18 0.260 0.040 0.300 0.130 0.37 SEP 09... 0.20 35 160 32 22 0.330 0.070 0.400 0.140 0.36 E = estimate K = non-ideal count 167 RIO GRANDE DE LOIZA BASIN 50055000 RIO GRANDE DE LOIZA AT CAGUAS, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM M1UM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1985 29... 1.9 2.3 10 0.370 1 200 50 1 14 50 DEC 11... 0.40 0.80 3.5 0.090 FEB 1986 03... 0.60 1.1 4.9 0.210 APR 16... 1.0 1.7 7.5 0.310 <1 <100 10 <1 1 30 JUL 15... 0.50 0.80 3.5 0.140 SEP 09... 0.50 0.90 4.0 0.200 MALAGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1985 29... 19000 17 740 0.10 <1 <1 70 <0.010 <1 0.04 DEC 11... FEB 1986 03... APR 16... 940 1 260 0.10 <1 <1 20 <0.010 3 0.15 JUL 15... SEP 09... 168 RIO GRANDE DE LOIZA BASIN 50055250 RIO CAGUITAS AT HIGHWAY 30 AT CAGUAS, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°15'11", long 66°01'26", at Highway 30 bridge, and 0.8 mi (1.3 km) east of Caguas plaza. DRAINAGE AREA.--14.1 sq mi (36.5 sq km). PERIOD OF RECORD.--Water years 1972 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARO WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1985 16... 1645 28 540 7.10 30.0 6.7 5.2 47 70000 5400 DEC 16... 1355 38 750 7.10 25.0 3.5 5.2 120 23000 K1000 FEB 1986 18... 1315 21 660 7.60 26.5 10 4.4 80 <1000 <1000 APR 22... 1305 22 592 7.60 29.5 8.0 4.8 64 76 46000 <1000 JUL 15... 1340 61 386 7.45 30.5 40 3.6 48 55 2000000 K110000 SEP 15... 1325 24 616 7.65 31.0 9.0 4.3 58 75 K1330000 K110000 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- HARD- NONCARB CALCIUM SIUM, SODIUM, AD- SLUM, WH WAT SULFATE RIDE, NESS WH WAT DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1985 16... 150 19 40 13 38 1 4.6 134 <0.5 45 40 DEC 16... 164 FEB 1986 18... 156 APR 22... 150 8 40 12 40 1 6.5 141 <0.5 52 43 JUL 15... 121 SEP 15... 150 0 39 12 51 2 6.9 164 59 55 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1985 16... 0.30 27 290 22 10 0.600 0.100 0.700 6.00 2.1 DEC 16... 10 0.490 0.210 0.700 15.0 2.0 FEB 1986 18... 20 0.590 0.310 0.900 10.0 3.0 APR 22... 0.30 29 310 18 22 0.890 0.210 1.10 9.20 JUL 15... 16 0.440 0.160 0.600 5.70 4.1 SEP 15... 0.90 29 350 23 13 1.25 0.250 1.50 10.0 7.0 K = non-ideal count 169 RIO GRANDE DE LOIZA BASIN 50055250 RIO CAGUITAS AT HIGHWAY 30 AT CAGUAS, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA NITRO- NITRO- PROS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABL: ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1985 16... 8.1 8.8 39 1.80 1 <100 90 4 5 DEC 16... 17 18 78 2.70 -- FEB 1986 18... 13 14 62 3.00 -- APR 22... 2.50 2 <100 90 2 19 70 JUL 15... 9.8 10 46 1.70 SEP 15... 17 18 82 3.80 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1985 16... 1200 4 260 -0.10 <1 2 90 0.010 9 1.2 DEC 16... FEB 1986 18... - APR 22... 800 4 280 0.30 <1 1 70 0.030 5 0.72 JUL 15... - SEP 15... - 170 171 RIO GRANDE DE LOIZA BASIN 50055400 RIO BAIROA NEAR CAGUAS, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°15'28", long 66°02'13", at bridge on Highway 1, about 2.5 mi (4.0 km) upstream from Rio Grande de Loiza, and 1.4 mi (2.3 km) north of Caguas plaza. DRAINAGE AREA.--5.4 sq mi (14.0 sq km). PERIOD OF RECORD.--Water years 1958, 1962-66, 1913-74, 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE BID- D1S- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER 1TY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1985 16... 1345 11 401 7.70 30.0 2.5 0.5 38 310000 68000 DEC 16... 1130 8.6 395 8.00 23.0 4.1 7.8 <10 28000 3000 FEB 1986 18... 1115 7.2 458 7.40 23.5 10 0 99 K2000000 130000 APR 21... 1220 5.6 348 1.80 25.5 39 8.0 99 29 40000 450000 JUL 16... 0910 5.1 377 7.65 25.5 12 8.4 104 <10 K9700 K1800 SEP 10... 0900 4.5 412 7.90 26.0 1.5 8.2 102 15 2400 2700 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- HARD- NONCARB CALCIUM SLUM, SODIUM, AD- SLUM, WATER SULFATE RIDE, NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS 5) AS SO4) AS CL) OCT 1985 16... 140 0 34 14 24 0.9 4.6 156 <0.5 23 34 DEC 16... 121 FEB 1986 18... 141 APR 21... 120 16 28 12 18 0.7 4.3 103 <0.5 16 23 JUL 16... 121 SEP 10... 150 13 35 14 24 0.9 4.2 132 19 37 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) S102) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1985 16... 0.20 29 260 7.6 3 1.29 0.110 1.40 1.20 1.0 DEC 16... 2 1.78 0.020 1.80 0.060 0.34 FEB 1986 18... 12 1.25 0.050 1.30 3.80 3.4 APR 21... 0.20 23 190 2.8 52 1.33 0.070 1.40 0.150 0.45 JUL 16... 17 0.980 0.020 1.00 0.100 0.50 SEP 10... 0.20 27 240 2.9 6 1.19 0.010 1.20 0.080 0.32 K = non-ideal count RIO GRANDE DE LOIZA BASIN 50055400 RIO BAIROA NEAR CAGUAS, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1985 16... 2.2 3.6 16 1.20 2 100 50 1 27 10 DEC 16... 0.40 2.2 9.7 0.300 FEB 1986 18... 7.2 8.5 38 3.10 APR 21... 0.60 2.0 8.9 0.260 2 100 20 <1 24 10 JUL 16... 0.60 1.6 7.1 0.450 SEP 10... 0.40 1.6 7.1 0.290 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1985 16... 2600 26 230 <0.10 <1 <1 30 <0.010 7 1.1 DEC 16... FEB 1986 18... APR 21... 1700 3 150 <0.10 <1 <1 20 <0.010 <1 0.07 JUL 16... SEP 10... 172 I 173 RIO GRANDE DE LOIZA BASIN 50055650 QUEBRADA CAIMITO NEAR JUNCOS, PR LOCATION.--Lat 18°14'08", long 65°52'12", Hydrologic Unit 21010005, at upstream side of bridge on Highway 31, 0.5 mi (0.8 km) upstream from Rio Gurabo, and 3.5 i (5.6 km) east of Juncos. DRAINAGE AREA.--0.82 mil (2.12 km 2). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--January 1984 to current year. GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 310 ft (95 m), from topographic map. REMARKS.--Estimated daily discharges: Oct. 13-16, Apr. 15 to May 8 and June 29 to July 15. Records poor. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 992 ft'is (28.1 m'/s), Oct. 6, 1985, gage height, 13.37 ft (4.075 m), from fl)odmark, from rating curve extended above 100 ftYs (2.83 110/s) on basis of step-backwater analysis; minictim discharge, no flow many days in each year. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 150 ft'/s (4.25 10/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (W/s) (leis) (ft) (m) Date Time (ft'/s) (10/s) (ft) (m) Oct. 6 1745 *992 28.1 *13.37 4.075 May 13 0815 339 9.60 10.53 3.210 Oct. 7 0300 254 7.19 10.13 3.088 Aug. 28 2400 331 9.37 10.49 3.197 Oct. 18 1445 170 4.81 9.69 2.954 Aug. 29 0200 240 6.80 10.06 3.066 May 9 1630 414 11.7 10.87 3.313 No flow many days. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 3.6 3.3 .51 .37 .19 .13 .17 .09 2.4 .00 .15 2.9 2 21 2.5 .46 .35 .24 .12 .13 .06 1.6 .01 .05 1.9 3 4.3 1.9 .40 .31 .48 .12 .11 .05 1.1 .02 .04 1.1 4 8.0 1.5 .37 .36 .70 .14 .17 .03 .55 .01 .02 .75 5 7.3 1.3 .61 .30 .32 .12 1.6 .03 .45 .00 .00 .58 6 136 1.1 .51 .27 .19 .14 .53 .04 .27 .50 .00 1.5 7 71 .99 .36 .27 .18 .13 .17 .38 .25 .13 .01 .67 8 14 .80 .30 .27 .19 .11 .15 .35 .20 .04 .01 .28 9 5.8 .76 .28 1.4 .18 .12 .14 11 1.2 .02 .00 .15 10 3.3 .68 .24 .43 .18 .12 .10 5.8 .25 .00 .00 .11 11 2.3 .82 .22 .27 .21 .16 .09 6.7 .15 .01 .34 .09 12 1.7 2.4 .22 .24 .20 .13 .09 2.4 .12 .04 .03 .07 13 1.0 4.4 .22 .25 .18 .17 .08 32 .12 .01 .01 .71 14 .70 1.6 .23 .24 .16 .32 .07 23 .14 .02 .03 .25 15 .50 30 .29 .20 .12 .41 .06 4.6 .14 .11 .00 .07 16 .35 11 .24 .24 .12 .09 .05 1.7 .19 .03 .30 .04 17 .33 3.7 .26 .27 .14 .08 .05 .70 .15 .01 .02 .00 18 11 3.7 .26 .25 .12 .08 .04 1.0 .12 .00 .01 .00 19 3.5 2.1 .27 .24 .12 .08 .03 .51 .11 .00 .00 .00 20 1.6 1.4 .23 .22 .13 .09 .04 .27 .09 .00 .00 .00 21 .94 2.2 .22 .25 .10 .08 .04 .27 .07 .00 .00 .00 22 .65 1.1 .24 .23 .12 .07 .03 .25 .06 .00 .00 .00 23 8.3 .91 .22 .28 .13 .09 .03 .18 .05 .00 .00 .05 24 23 1.0 .22 .39 .14 .09 .03 .14 .04 .00 .00 .02 25 13 .75 .35 .30 .17 .12 .02 .11 .03 .00 .00 .03 26 5.3 .64 .26 .26 .15 .14 .02 .11 .03 .00 .00 .01 27 3.4 .63 .22 .24 .13 .13 .10 .10 .08 .00 .00 .00 28 2.8 .51 .25 .22 .13 .10 .20 .09 .03 .00 7.4 .00 29 7.0 .51 .30 .21 --- .59 3.0 .09 .02 .11 28 .00 30 4.2 .52 .31 .25 .14 1.0 .09 .01 5.0 4.8 .00 31 4.4 --- .31 .21 .21 --- 6.1 --- 1.1 5.0 --- TOTAL 370.27 84.69 9.38 9.59 5.42 4.62 8.34 98.24 10.02 7.17 46.22 11.28 MEAN 11.9 2.82 .30 .31 .19 .15 .28 3.17 .33 .23 1.49 .38 MAX 136 30 .61 1.4 .70 .59 3.0 32 2.4 5.0 28 2.9 MIN .33 .51 .22 .20 .10 .07 .02 .03 .01 .00 .00 .00 CFSM 14.5 3.44 .37 .38 .23 .18 .34 3.87 .40 .28 1.82 .46 IN. 16.80 3.84 .43 .44 .25 .21 .38 4.46 .45 .33 2.10 .51 AC-FT 734 168 19 19 11 9.2 17 195 20 14 92 22 CAL YR 1985 TOTAL 839.00 MEAN 2.22 MAX 136 MIN .00 CFSM 2.71 IN. 36.70 AC-FT 1600 WTR YR 1986 TOTAL 665.24 MEAN 1.82 MAX 136 MIN .00 CFSM 2.22 IN. 30.18 AC-FT 1320 174 RIO GRANDE DE LOIZA BASIN 50055650 QUEBRADA CAIMITO NR JUNCOS, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS JUNE 1984 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 STREAMFLOW, SPECIFIC CON- TEMPERA- STPEAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) DEC, 05 1232 1.5 342 25.5 SEP, 15 1235 0.07 351 32.0 I I 175 RIO GRANDE DE LOIZA BASIN 50056400 RIO VALENCIANO NEAR JUNCOS. PR LOCATION.--Lat 18°12'58", long 65°55'34", Hydrologic Unit 21010005, on left bank at Highway 919, 0.5 mi (0.8 km) upstream fro Quebrada Don Victor, 1.7 mi (2.7 km) upstream from Rio Gurabo and 1.0 mi (1.6 km) south of Juncos. DRAINAGE AREA.--16.4 i' (42.5 km'). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--January 1971 to current year. GAGE.--Water-stage recorder. Elevation of gage is 320 ft (98 m), from topographic map. REMARKS.--Estimated daily discharges: Mar. 7-12. Records fair except those for estimated daily discharges, which are poor. AVERAGE DISCHARGE.--15 years (1972-86), 51.3 ft'is (1.453 re/s), 42.48 in/yr (1,079 mm/yr), 37,170 acre-ft/yr (45.8 hm'/yr); median of yearly mean discharges, 52 ft'/s (1.47 m'/s), 37,700 acre-ft/yr (46 he/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 25,700 ft3/s (728 m'/s), May 18, 1985, gage height, 21.30 ft (6.492 m), from rating curve extended above 100 ft'is (2.83 m'/s) on basis of slope-area measurement and step-backwater analysis; minimum discharge, 2.0 ft'is (0.057 10/s), May 11, 1984. EXTREMES OUTSIDE PERICD OF RECORD.--Approximate discharges (no stages were recorded) of major floods are as follows: Sept. 6, 1960, 37,100 ft'/s (1,050 le/s); Oct. 9, 1970, 18,200 ft'/s (515 10/s). EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 3,400 ft'is (96.3 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft)/s) (60/s) (ft) (m) Date Time (ft'/s) (m/s) (ft) (m) Oct. 6 1130 *7,460 211 *11.32 3.450 May 13 0830 4.280 121 8.49 2.588 Oct. 7 2330 3,800 108 8.05 2.454 May 14 0100 5,490 155 9.65 2.941 Oct. 24 1745 5,690 161 9.84 2.999 Minimum discharge. 6.3 ft'is (0.178 o'/s), Apr. 25. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 46 90 29 24 13 8.8 64 22 42 25 20 22 2 79 79 31 27 13 9.0 17 16 57 21 18 19 3 79 63 29 22 12 9.1 13 14 53 22 13 16 4 77 58 27 22 15 9.3 29 16 35 20 14 15 5 180 64 41 20 15 11 28 12 32 19 12 15 6 2920 55 38 18 12 11 23 20 27 40 12 16 7 1420 50 30 18 11 9.0 14 88 54 30 18 15 8 428 4E 26 17 11 8.6 23 69 107 20 42 13 9 136 42 25 35 11 9.0 46 49 141 19 19 12 10 95 40 26 27 11 8.8 14 308 204 17 20 12 11 76 44 25 20 12 9.4 11 215 51 19 33 11 12 66 56 34 18 12 8.8 11 53 42 20 17 11 13 59 51 25 17 11 11 10 851 79 17 50 12 14 53 51 23 16 10 13 9 5 831 68 24 49 18 15 50 385 24 16 10 38 9 3 89 46 24 25 12 16 51 130 23 17 10 13 9.5 61 54 19 18 11 17 72 74 22 61 12 11 9.1 54 34 18 16 11 18 201 200 24 24 16 8.2 9.0 417 33 18 14 9.5 19 80 63 23 19 12 8.2 8.6 127 49 16 14 9.7 20 56 5' 26 17 12 8.2 8.4 69 31 16 13 9.5 21 55 50 22 18 11 8.3 8.3 66 28 16 12 9.0 22 47 41 22 16 11 8.8 7.8 63 26 15 11 11 23 453 40 22 15 9 9 8.5 7.4 42 25 20 11 12 24 1050 37 25 17 9 7 7.4 7.9 36 24 18 11 33 25 208 34 21 16 11 8.3 7.1 32 22 15 11 26 26 150 31 23 16 11 17 7.1 29 23 14 9 8 16 27 104 31 21 14 9.6 8.8 10 29 26 16 9 5 13 28 77 30 21 14 9.0 9.8 21 26 23 17 27 15 29 478 30 19 13 --- 93 365 25 21 14 386 12 30 112 30 18 14 18 60 23 21 23 29 11 31 160 --- 19 13 35 --- 114 --- 24 20 --- TOTAL 9118 2048 784 621 323.2 445.3 868.0 3866 1478 616 974.3 427.7 MEAN 294 68.3 25.3 20.0 11.5 14.4 28.9 125 49.3 19.9 31.4 14.3 MAX 2920 385 41 61 16 93 365 851 204 40 386 33 MIN 46 30 18 13 9.0 7.4 7.1 12 21 14 9.5 9.0 CFSM 17.9 4.16 1.54 1.22 .70 .88 1.76 7.62 3.01 1.21 1.91 .87 IN. 20.68 4.65 1.78 1.41 .73 1.01 1.97 8.77 3.35 1.40 2.21 .97 AC-FT 18090 4060 1560 1230 641 883 1720 7670 2930 1220 1930 848 CAL YR 1985 TOTAL 27815.2 MEAN 76.2 MAX 3910 MIN 9.1 CFSM 4.65 IN. 63.09 AC-FT 55170 WTR YR 1986 TOTAL 21569.5 MEAN 59.1 MAX 2920 MIN 7.1 CFSM 3.60 IN. 48.93 AC-FT 42780 RIO GRANDE DE LOIZA BASIN 50056400 RIO VALENCIANO NEAR JUNCOS, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS AUGUST 1981 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) DEC, 05 1018 34 274 22.5 SEP, 15 1030 12 253 28.0 MAR, 12 0950 10 280 24.0 176 I 177 RIO GRANDE DE LOIZA BASIN 50056900 QUEBRADA MAMEY NEAR GURABO, PR LOCATION.--Lat 18°14'57", long 65°56'44", Hydrologic Unit 21010005, at left downstream side of bridge on Highway 189, 1.9 mi (3.0 km) southeast of Gurabo plaza, and 2.1 mi (3.4 km) northwest of Juncos plaza. DRAINAGE AREA.--2.30 mi' (5.96 km 2 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--December 1983 to current year. GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 180 ft (55 m), from topographic map. REMARKS.--Estimated daily dicharges: Feb. 27 to Mar. 3. Records fair except those for estimated daily discharges, which are poor. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 1,690 ft'/s (47.9 m'/s), May 15, 1985, gage height, 9.42 ft (2.871 m), from floodmark, from rating curve extended above 400 fti/s (11.3 m3 /s) on basis of indirect measurement of peak flow and step-backwater analysis; minimum discharge, 0.24 ft'/s (0.007 '/s), Aug. 30, 1984. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 500 ft'is (14.2 m'/s) and maximum ( * ) Discharge Gage height Discharge Gage height Date Time (ft'/s) (e/s) (ft) (m) Date Time (W/s) (fe/s) (ft) (m) Oct. 7 0015 841 23.8 7.66 2.335 May 13 0830 *1,070 30.3 *8.16 2.487 Nov. 15 0945 528 15.0 6.84 2.085 May 14 0015 985 27.9 7.97 2.429 May 9 1600 506 14.3 6.77 2.063 Minimum discharge, 0.46 ft'/s (0.013 m'/s), Sept. 20, 21, 30. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 2.8 4.3 2.3 1.4 1.1 .88 1.1 2.2 .96 .75 .67 1.6 2 9.8 3.4 2.2 1.6 1.1 .85 .73 1.7 2.8 .75 .64 .91 3 2.3 3.1 2.0 1.4 1.1 .77 .71 1.5 1.2 .72 .64 .79 4 17 3.0 2.0 1.5 5.9 .79 1.0 1.4 .92 .69 .64 .69 5 17 3.0 2.2 1.5 1.9 .80 2.1 1.4 3.5 .70 .59 .68 6 251 2.8 2.2 1.5 1.2 .80 1.4 1.4 .99 1.1 .57 .74 7 189 2.7 2.3 1.5 1.1 .79 .83 2.8 .91 .87 .62 .66 8 54 2.5 2.3 1.5 1.1 .75 27 17 .87 .79 1.1 .62 9 8.6 2.6 2.5 2.0 1.1 .72 3.5 41 4.3 .78 .75 .62 10 5.2 2.5 2.5 1.8 1.1 .72 1.2 21 1.3 .76 .77 .60 11 4.1 2.6 2.5 1.6 1.1 .76 1.1 18 .96 .79 2.0 .57 12 3.6 3.2 2.4 1.5 1.1 .74 .89 2.9 .91 .82 .84 .56 13 3.4 4.6 2.2 1.5 1.0 .74 .84 173 1.3 .80 .74 .56 14 3.2 3.4 2.1 1.4 1.0 .82 .80 87 1.5 .72 .84 .56 15 3.2 87 2.2 1.3 1.0 1.8 .84 2.4 .93 .75 1.1 .59 16 3.2 12 1.9 1.4 1.0 .81 .89 1.4 .95 .77 .91 .55 17 3.1 7.6 2.0 1.4 1.0 .75 .82 1.1 .87 .69 .75 .53 18 14 31 1.9 1.3 1.0 .73 .76 2.8 .84 .64 .75 .51 19 5.2 5.2 1.9 1.3 1.0 .73 .73 5.4 .81 .61 .73 .50 20 3.4 4.7 1.8 1.2 .99 .73 7.4 1.3 .80 .59 .70 .49 21 3.2 34 1.8 1.2 .95 .72 1.6 1.0 .79 .59 .70 .49 22 3.1 4.5 1.7 1.3 .94 .70 .86 .99 .78 .60 .72 .52 23 35 3.8 1.6 1.4 .90 .69 .73 .92 .79 .62 .72 .55 24 34 3.4 1.6 1.4 .88 .72 .69 .88 .78 .59 .72 .74 25 10 3.0 1.7 1.4 .85 .74 .66 .83 .76 .58 .71 .68 26 6.2 2.8 1.6 1.3 .83 .75 .62 .84 .74 .57 .68 .63 27 5.1 2.6 1.4 1.3 .82 .73 .69 .83 .83 .57 .69 .57 28 3.6 2.5 1.4 1.3 .91 .69 1.3 .84 .78 .59 11 .54 29 21 2,4 1.4 1.3 --- 1.3 40 .82 .75 .59 55 .51 30 6.3 2.4 1.4 1.2 .80 4.7 .79 .76 2.0 1.6 .49 31 25 --- 1.3 1.2 1.0 --- 3.1 --- .92 1.0 --- TOTAL 755.6 252.6 60.3 43.9 33.97 25.32 106.49 398.54 35.38 23.31 89.89 19.05 MEAN 24.4 8.42 1.95 1.42 1.21 .82 3.55 12.9 1.18 .75 2.90 .63 MAX 251 87 2.5 2.0 5.9 1.8 40 173 4.3 2.0 55 1.6 MIN 2.3 2.4 1.3 1.2 .82 .69 .62 .79 .74 .57 .57 .49 CFSM 10.6 3.66 .85 .62 .53 .36 1.54 5.61 .51 .33 1.26 .27 IN. 12.22 4.09 .98 .71 .55 .41 1.72 6.45 .57 .38 1.45 .31 AC-FT 1500 501 120 87 67 50 211 791 70 46 178 38 CAL YR 1985 TOTAL 2099.59 MEAN 5.75 MAX 251 MIN .28 CFSM 2.50 IN. 33.96 AC-FT 4160 WTR YR 1986 TOTAL 1844.35 MEAN 5.05 MAX 251 MIN .49 CFSM 2.20 IN. 29.83 AC-FT 3660 178 RIO GRANDE DE LOIZA BASIN 50056900 QUEBRADA MAMEY NEAR GURABO, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS MARCH 1984 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) DEC, 06 1201 2.1 612 24.0 179 RIO GRANDE DE LOIZA BASIN 50057000 RIO GURABO AT GURABO, PR LOCATION.--Lat 18°15'30", long 65°58'05% Hydrologic Unit 21010005, on left bank, at bridge on Highway 181, 0.3 mi (0.5 km) east or Gurabo, and 4.5 mi (7.6 km) upstream from Rio Grande de Loiza. DRAINAGE AREA.--60.2 m1 2 (155.9 km 2). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--1958 (occasional low-flow measurements only), January to September 1959 (monthly measurements only), October 1959 to current year. GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 136.58 ft (41.63 m) above mean sea level. REMARKS.--Estimated daily discharges: Nov. 21-27 and June 10-26. Records fair except those for estimated daily discharges, which are poor. AVERAGE DISCHARGE.--27 years (1960-86), 135 Wits (3.823 m'/s), 30.45 in/yr (773 mm/yr), 97,810 acre-ft/yr (120 hiP/yr); median of yearly mean discharges, 130 ft'/s (3.68 e/s), 94,200 acre-ft/yr (116 he/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 74,600 ft'is (2,133 m'/s), Sept. 6, 1960, gage height, 27.7 ft (8.44m), from floodmark, from rating curve extended above 8,000 ft'is (227 10/s) on basis of slope-area measurement at gage height 21.6 ft (6.58 m), contracted opening, culvert and flow over road measurement at gage height 23.76 ft (7.242 m), and estimate of peak flow based on slope-area measurements of Rio Gurabo and Rio Valenciano, 7.0 mi (11.3 km) upstream, adjusted for channel storage and flow from intervening area; minimum discharge, 4.5 ft'is (0.127 m'/s), Feb. 21,25, 1968. EXTREMES OUTSIDE PERIOD OF RECORD.--Approximate elevation to gage datum of the Aug. 4, 1945 flood, as pointed out by local residents, 26.6 ft (8.11 a). EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 3,000 ft'/s (85.0 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (W/s) 00 /s) (ft) (m) Date Time (W/s) (10/s) (ft) (m) Oct. 6 2045 *19,300 547 *19.37 5.904 Nov. 15 1330 5,370 152 11.63 3.545 Oct. 8 0315 5,330 151 11.58 3.530 Apr. 29 1800 5,810 164 12.16 3.706 Oct. 23 1730 4,160 118 10.08 3.072 May 13 1130 10,600 300 15.87 4.837 Oct. 24 2000 4,930 140 11.09 3.380 May 14 0245 12,370 350 16.72 5.096 Oct. 29 1015 3,790 107 9.56 2.914 Aug. 29 0515 6,680 189 13.15 4.008 Minimum discharge, 12 ft'is (0.340 m'/s), Mar. 25, Apr. 26, 27, May 6. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 DAY OCT NOV DEC JAN MEAN FEB VALUES MAR APR MAY JUN JUL AUG SEP 1 2 3 4 5 210 725 205 214 833 235 199 177 149 177 65 65 65 62 89 44 59 47 48 48 32 30 31 64 70 21 21 21 20 27 138 51 40 42 129 55 32 21 19 15 182 126 126 85 140 51 50 49 47 45 55 40 32 29 27 99 68 48 42 41 6 7 8 9 10 8800 5470 1900 413 261 164 139 114 104 98 97 82 70 69 70 40 37 35 83 94 39 32 30 30 29 25 23 21 20 20 132 45 85 175 44 21 205 192 515 678 85 71 164 304 269 126 122 48 37 34 26 29 67 27 31 69 57 39 35 33 11 12 13 14 15 202 168 149 136 119 101 173 265 198 2060 68 74 71 61 60 50 41 36 34 33 28 27 25 24 24 21 25 22 38 173 31 28 26 24 23 818 158 3090 3050 260 124 89 106 145 94 33 40 34 34 73 98 50 39 152 38 31 29 29 41 32 16 17 18 19 20 111 128 587 282 148 584 233 50 231 190 63 59 59 59 63 33 76 56 41 35 25 25 30 31 28 51 32 26 20 20 22 21 19 17 24 174 136 464 249 160 156 96 81 102 73 55 37 36 31 28 52 33 29 28 27 29 27 26 25 24 21 22 23 24 25 126 113 1170 1840 860 410 125 96 88 83 55 54 52 53 50 37 35 35 43 46 28 27 25 23 23 19 19 16 19 16 21 20 16 16 15 136 128 104 88 72 60 59 66 51 50 28 26 26 25 25 23 25 30 30 31 23 24 29 57 49 26 27 28 29 30 31 351 317 240 973 384 406 80 78 72 69 66 --- 56 49 47 47 43 43 37 31 30 30 32 34 24 21 21 --- 25 24 19 179 84 71 13 16 49 1240 253 --- 66 71 68 75 70 476 51 55 66 61 57 --- 23 24 27 34 285 146 27 26 102 1970 132 87 37 31 32 28 26 --- TOTAL MEAN MAX MIN CFSM IN. AC-FT 27841 898 8800 111 14.9 17.20 55220 7341 245 2060 66 4.07 4.54 14560 1920 61.9 97 43 1.03 1.19 3810 1360 43.9 94 30 .73 .84 2700 846 30.2 70 21 .50 .52 1680 1138 36.7 179 16 .61 .70 2260 2775 92.5 1240 13 1.54 1.71 5500 11666 376 3090 15 6.25 7.21 23140 3194 106 304 50 1.76 1.97 6340 1679 54.2 285 23 .90 1.04 3330 3392 109 1970 23 1.81 2.10 6730 1160 38.7 99 23 .64 .72 2300 CAL YR 1985 WTR YR 1986 TOTAL TOTAL 80107 64312 MEAN MEAN 219 176 MAX MAX 10900 8800 MIN MIN 16 13 CFSM CFSM 3.64 2.92 IN. IN. 49.50 39.74 AC-FT AC-FT 158900 127600 1110 RIO GRANDE DE LOIZA BASIN 50057000 RIO GURABO AT GURAGO, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS AUGUST 1981 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) DEC, 06 0946 89 326 24.0 MAR, 11 1250 19 390 27.0 181 RIO GRANDE DE LOIZA BASIN 50057025 RIO GURABO NEAR GURABO, PR WATER-QUALITY RECORDS LOCATION.--Lat 18'15 1 5,5", 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 sq mi (162.7 sq km). PERIOD OF RECORD.--Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLT- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1985 29... 1730 325 125 6.80 26.0 550 8.0 61 54000 55000 DEC 19... 1345 22 412 7.60 27.5 6.4 2.8 35 22 120000 K6000 FEB 1986 26... 1225 18 436 7.75 26.5 5.6 5.2 66 21 K100 <10 APR 24... 1015 18 430 7.60 29.5 6.0 5.3 70 15 2000 K40 JUL 14... 1230 25 358 7.55 30.0 2.5 5.0 67 31 140000 2000 SEP 10... 1155 33 363 7.70 30.0 11 5.0 67 13 15000 2000 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- HARD- NONCARB CALCIUM SLUM, SODIUM, AD- SLUM, WATER SULFATE RIDE, NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1985 29... 37 0 8.3 4.0 8.2 0.6 3.3 37 <0.5 9.5 8.9 DEC 19... 115 FEB 1986 26... 131 APR 24... 130 8 29 15 36 1 4.6 126 <0.5 18 39 JUL 14... 117 SEP 10... 110 0 25 12 27 1 4.6 121 20 27 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1985 29... <0.10 15 79 70 480 0.250 0.150 0.400 0.360 1.7 DEC 19... 17 1.30 0.100 1.40 0.540 0.26 FEB 1986 26... 7 1.58 0.120 1.70 0.880 0.92 APR 24... 0.20 35 250 12 8 1.30 0.100 1.40 0.240 0.86 JUL 14... 14 0.750 0.050 0.800 0.610 0.69 SEP 10... 0.20 32 220 19 12 1.13 0.070 1.20 0.480 0.52 K = non-ideal count RIO GRANDE DE LOIZA BASIN 50057025 RIO GURABO NEAR GURABO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1985 29... 2.1 2.5 11 0.480 2 200 70 <1 29 40 DEC 19... 0.80 2.2 9.7 0.500 FEB 1986 26... 1.8 3.5 15 0.820 APR 24... 1.1 2.5 11 0.720 2 100 60 <1 11 <10 JUL 14... 1.3 2.1 9.3 0.460 SEP 10... 1.0 2.2 9.7 0.620 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CM) (UG/L) (MG/L) OCT 1985 29... 17000 4 550 0.10 <1 <1 50 <0.010 3 0.05 DEC 19... FEB 1986 26... APR 24... 570 1 510 <0.10 <1 <1 20 <0.010 <1 0.07 JUL 14... SEP 10... 182 183 RIO GRANDE DE LOIZA BASIN 50059000 LAGO LOIZA AT DAMSITE, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°19'49", long 66°01'00", at pumphouse at damsite, and 1.9 mi (3.1 km) south of Tru­ jillo Alto plz.za. DRAINAGE AREA.--208 sq mi (539 sq km). PERIOD OF RECORD.--Water years 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLT- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIVIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (MG/L) ATION) (MG/L) 100 ML) 100 ML) NOV 1985 01... 1130 124 190 7.10 27.0 3.2 23 K890 750 DEC 20... 0845 124 312 7.50 25.0 5.8 63 54 42 FEB 1986 25... 1020 305 7.35 25.0 1.6 20 26 K18 K35 APR 21... 1430 124 288 7.40 26.0 1.2 15 22 96 50 JUL 14... 1405 124 265 7.00 31.0 2.2 30 13 K2 76 SEP 09... 1335 170 162 7.40 30.0 3.4 45 <10 K250 87 ALKA- SOLIDS, NITRO- LINITY RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- GEN,AM- WATER AT 105 GEN, GEN, GEN, GEN, GEN, MONIA + NITRO- TOTPL SULFIDE DEG. C. NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC ORGANIC GEN, FIELD TOTAL SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL DATE MG/L AS (MG/L PENDED (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L CACO3 AS S) (MG/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) NOV 1985 01... 53 <0.5 114 0.610 0.090 0.700 0.150 0.45 0.60 1.3 DEC 20... 90 3 0.480 0.120 0.600 0.230 0.47 0.70 1.3 FEB 1986 25... 92 3 0.380 0.020 0.400 0.130 0.47 0.60 1.0 APR 21... 84 <0.5 7 0.180 0.020 0.200 0.310 0.49 0.80 1.0 JUL 14... 90 10 0.050 0.050 0.100 0.200 0.60 0.80 0.90 SEP 09... 52 35 0.220 0.080 0.300 0.370 0.63 1.0 1.3 MANGA- METHY- BORON, COPPER, IRON, NESE, ZINC, LENE NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL BLUE GEN, PHORUS, RECOV- RECOV- RECOV- RECOV- RECOV- CYANIDE ACTIVE TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE TOTAL PHENOLS SUB- DATE (MG/L (MG/.. (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS NO3) AS P) AS B) AS CU) AS FE) AS MN) AS ZN) AS CN) (UG/L) (MG/L) NOV 1985 01... 5.8 0.170 30 50 4400 110 20 <0.010 4 0.03 DEC 20... 5,8 0.150 FEB 1986 25... 4.4 0.170 APR 21... 4.4 0.180 40 30 370 320 40 <0.010 <1 0.07 JUL 14... 4.0 0.130 SEP 09... 5.8 0.220 -- K = non-ideal:count RIO GRANDE DE LOIZA BASIN 50059100 RIO GRANDE DE LOIZA BELOW TRUJILLO ALTO, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°21'35", long 66°00'15", 100 ft (30 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 sq mi (552 sq km). PERIOD OF RECORD.--Water years 1981 to current year. REMARKS: Flow controlled by Lago Loiza reservoir. WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE BID- DIS- CELT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) NOV 1985 01... 1435 30 209 7.70 29.5 64 7.6 22 3100 490 DEC 20... 0945 421 8.00 26.0 1.5 7.0 52 2000 40 FEB 1986 25... 1310 11 402 8.85 26.0 1.1 13.3 166 24 K860 200 APR 24... 1410 6.8 369 8.20 29.5 4.5 8.0 106 30 2400 K35 JUL 24... 1055 7.8 347 8.50 31.0 3.0 11.0 149 19 100 K10 SEP 15... 1035 6.7 342 8.30 30.0 0.60 10.6 141 27 K18 K16 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- HARD- NONCARB CALCIUM SIUM, SODIUM, AD- SLUM, WATER SULFATE RIDE, NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) NOV 1985 01... 63 0 15 6.1 13 0.7 2.6 54 <0.5 18 14 DEC 20... 133 FEB 1986 25... 132 APR 24... 120 5 30 12 27 1 2.8 119 <0.5 17 29 JUL 24... 119 SEP 15... 120 3 29 11 25 1 2.8 115 24 24 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL -OTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) NOV 1985 01... <0.10 <0.1 130 90 0.700 0.100 0.800 0.150 0.55 DEC 20... 1 0.970 0.030 1.00 0.030 0.27 FEB 1986 25... 2 0.480 0.020 0.500 '0.060 0.44 APR 24... 0.20 23 210 3.9 1 0.270 0.030 0.300 0.070 0.73 JUL 24... 23 <0.010 0.100 0.030 0.27 SEP 15... 0.20 24 210 3.8 1 <0.010 0.200 0.030 0.57 184 185 RIO GRANDE DE LOIZA BASIN 50059100 RIO GRANDE DE LOIZA BELOW TRUJILLO ALTO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, M)NIA + NITRO NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS W) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) NOV 1985 01... 0.70 1.5 6.6 0.180 1 <100 30 1 17 20 DEC 20... 0.30 1.3 5.8 0.260 FEB 1986 25... 0.50 1.0 4.4 0.310 APR 24... 0.80 1.1 4.9 0.320 1 100 30 <1 11 10 JUL 24... 0.30 0.40 1.8 0.250 SEP 15... 0.60 0.80 3.5 0.180 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MGM NOV 1985 01... 4000 4 140 <0.10 <1 <1 70 <0.010 5 0.04 DEC 20... FEB 1986 25... APR 24... 650 <1 180 <0.10 <1 <1 30 <0.010 1 0.06 JUL 24... SEP 15... I I I 186 RIO GRANDE DE LOIZA BASIN 50061800 RIO CANOVANAS NEAR CAMPO RICO, PR LOCATION.--Lat 18°19'08", long 65'53'21', Hydrologic Unit 21010005, at center pier on downstream side of bridge, on paved secondary road, 0.4 i (0.6 km) northeast of junction of Highways 185 and 186, 1.5 mi (2.4 km) south of Campo Rico, and 4.4 mi (7.1 km) south of Loiza. DRAINAGE AREA.--9.84 mi' (25.48 km=). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--March 1967 to current year. GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 225 ft (68 m), from topographic map. REMARKS.--Estimated daily discharges: Feb. 9-11. Records fair except those for estimated daily discharges, which are poor. AVERAGE DISCHARGE.--19 years (1968-86), 28.5 ft'is (0.807 m'/s), 39.33 in/yr (999 mm/yr), 20,650 acre-ft/yr (25.5 hmYyr); median of yearly mean discharges, 27 ft'is (0.76 10/s), 19,600 acre-ft/yr (24 hp0/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 15,000 ft'is (425 m3/s). Sept. 13, 1982, gage height, 13.1 ft (3.99 m), from floodmarks, from rating curve extended above 350 ft'is (9.91 mi/s) on basis of slope-area measurements and step- backwater analysis made in 1981; minimum daily discharge, 0.80 ft'/s (0.023 '/s), July 24, 1977. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 2,500 ft'/s (70.8 '/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (W/s) (m'/s) (ft) (m) Date Time (W/s) (m3/s) (ft) (m) Oct. 6 1800 *6,960 197 *9.80 2.987 May 13 2315 5.710 162 8.98 2.737 Nov. 15 1800 2,740 77.6 6.59 2.009 Minimum discharge, 3.5 ft'is (0.099 m'/s), Apr. 26. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 29 46 36 15 8.4 5.6 19 16 41 9.0 10 24 2 157 41 34 17 9.1 5.1 8.1 25 26 8.9 7.8 13 3 47 38 33 17 17 5.0 23 9.1 23 8.5 7.1 10 4 55 43 32 21 32 5.1 15 6.9 21 8.4 7.0 8.8 5 180 44 35 17 27 7.6 116 5.7 19 8.0 6.1 8.3 6 1050 40 34 15 14 5.6 35 5.8 17 10 5.7 10 7 640 33 31 14 11 5.2 13 14 16 12 5.5 10 8 202 29 29 14 9.4 4.7 9.8 30 15 7.9 6.6 7.7 9 93 29 30 45 8.6 5.6 10 171 42 6.7 5.4 7.0 10 69 26 29 21 8.4 5.6 7.9 82 22 6.7 4.9 6.9 11 57 36 31 13 8.3 5.9 7.0 94 18 5.8 18 6.5 12 49 138 32 11 7.8 5.6 6.4 25 16 6.6 19 6.7 13 45 249 28 11 7.2 6.3 6.6 571 17 5.9 23 7.3 14 41 132 25 10 7.0 7.8 6.2 355 17 6.5 21 8.7 15 37 743 28 11 7.3 18 5.8 49 17 16 11 7.2 16 35 215 25 11 6.9 8.6 6.1 33 17 11 9.8 6.7 17 34 111 24 12 7.2 7.0 6.0 27 18 11 7.6 6.6 18 166 127 22 11 6.9 5.3 5.8 45 15 8.2 6.2 6.3 19 62 75 21 10 6.7 5.0 5.2 36 14 6.7 6.3 6.2 20 42 142 21 8.8 7.0 5.1 5.1 26 15 5.9 6.2 5.7 21 35 265 21 9.5 6.3 4.9 5.5 23 13 5.9 5.5 6.1 22 33 80 21 10 6.2 4.3 5.3 21 12 6.0 5.8 6.7 23 273 69 20 11 5.9 4.3 4.2 18 11 5.7 5.6 7.1 24 304 62 20 14 5.5 5.3 4.8 17 12 5.6 6.9 6.7 25 124 52 19 13 5.8 5.6 4.8 16 11 5.8 6.2 7.2 26 69 48 20 9.8 6.1 5.5 4.0 15 11 5.3 5.6 8.1 27 60 45 18 9.3 5.7 5.8 4.3 15 14 4.9 4.9 7.9 28 65 42 18 8.7 5.7 6.3 7.7 73 11 5.5 96 6.7 29 94 40 17 8.9 --- 17 43 30 9.5 8.5 319 5.9 30 56 39 16 8.9 15 25 21 9.3 67 20 6.1 31 59 --- 16 9.9 7.9 --- 176 --- 35 16 --- TOTAL 4262 3079 786 417.8 264.4 211.6 425.6 2051.5 519.8 324.9 685.7 242.1 MEAN 137 103 25.4 13.5 9.44 6.83 14.2 66.2 17.3 10.5 22.1 8.07 MAX 1050 743 36 45 32 18 116 571 42 67 319 24 MIN 29 26 16 8.7 5.5 4.3 4.0 5.7 9.3 4.9 4.9 5.7 CFSM 13.9 10.5 2.58 1.37 .96 .69 1.44 6.73 1.76 1.07 2.25 .82 IN. 16.11 11.64 2.97 1.58 .00 .80 1.61 7.76 1.97 1.23 2.59 .92 AC-FT 8450 6110 1560 829 524 420 844 4070 1030 644 1360 480 CAL YR 1985 TOTAL 15944.2 MEAN 43.7 MAX 1050 MIN 4.8 CFSM 4.44 IN. 60.28 AC-FT 31630 WTR YR 1986 TOTAL 13270.4 MEAN 36.4 MAX 1050 MIN 4.0 CFSM 3.70 IN. 50.17 AC-FT 26320 187 RIO GRANDE DE LOIZA BASIN 50061800 RIO CANOVANAS NEAR CAMPO RICO, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS AUGUST 1981 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA­ DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) MAY, 16 0940 34 146 23.0 AUG, 18 1428 6.0 229 30.0 JUN, 19 1340 13 209 28.5 SEP, 10 1330 6.6 207 29.5 JUL, 16 1453 9 224 30.0 189 ATLANTIC OCEAN UQUILLO Rib Grande de Laza basin Drainage boundary-. LAS PIEDRAS ,' Rib Humacao basin ° Coasialbasin Mop ore 5A11 JuAN EXPLANATION A0670 SURFACE—WATER STATION AND NUMBER V0725 QUALITY—OF—WATER STATION AND NUMBER 4 5 K€LOME'MRS 4 5 WLES Figure 19.--Northeastern river basins--Rio Herrera to Rio Anton Ruiz basins. RIO ESPIRITU SANTO BASIN 50063440 QUEBRADA SONADORA NEAR EL VERDE, PR LOCATION.--Lat 18'19'24', long 65'49'03', Hydrologic Unit 21010005, in Caribbean National Forest, at El Yunque. 0.6 mi (1.0 km) upstream from Rio Espiritu Santo, 0.2 mi (0.3 km) upstream from Highway 185, and about 1.2 mi (1.9 km) south of El Verde. DRAINAGE AREA.--1.01 mi' (2.62 km'). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--March 1983 to current year. GAGE.--Water-stage recorder. Elevation of gage is 1,230 ft (375 m), from topographic map. REMARKS.--Estimated daily discharges: Feb. 8-11. Records poor. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 2,160 ft'is (61.2 s'/s), May 14, 1985, gage height, 9.36 ft (2.853 m) from rating curve extended above 20 ft3/s (0.57 20/s) on basis of step-backwater analysis; minimum discharge, 0.20 ft'is (0.006 m'/s), July 14, 15. 1985. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 500 ft'is (14.2 m3/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft3/s) (m'/s) (ft) (m) Date Time (W/s) (m3/s) (ft) (m) Oct. 24 1400 698 19.8 7.52 2.292 Aug. 13 1845 595 16.8 7.30 2.225 May 13 0830 569 16.1 7.24 2.207 Aug. 24 1845 *2,120 60.0 *9.32 2.841 Minimum discharge, 0.46 ft'/s (0.013 m'/s), Mar. 8. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 6.5 4.6 2.8 2.8 1.8 .80 6.2 28 3.7 2.6 3.0 7.7 2 14 6.1 2.9 4.1 2.7 .70 3.2 13 2.2 3.1 1.7 4.3 3 12 4.4 2.1 12 4.9 .62 7.9 3.3 1.9 6,0 1.4 3.3 4 6.3 3.8 2.5 9.9 22 .86 11 2.3 1.7 2.6 1.7 2.9 5 20 3.7 7.7 4.0 7.4 .88 28 1.8 1.7 6.4 .91 2.8 6 132 3.0 5.7 3.1 4.7 .59 11 2.2 1.5 11 .69 4.2 7 53 3.0 3.5 3.1 3.7 .57 5.0 9.5 1.5 8.9 5.1 2.8 8 13 2.4 2.3 3.5 2.2 .51 3,7 4.7 1.6 3.4 1.5 2.2 9 8.2 2.2 3.0 20 1.9 1.0 3.5 8.1 6.2 2.6 1.2 1.9 10 5.7 2.0 3.8 6.0 1.7 .91 2.9 8.5 13 2.2 1.4 1.7 11 4.3 11 4.8 4.8 1.4 1.9 2,7 9.2 3.5 2.1 9.1 1.5 12 3.6 37 12 3.8 1.2 1.2 2.5 3.0 4.2 4.2 5.1 1.3 13 3.1 46 4.0 3.3 .97 3.9 2.4 50 13 2.2 42 1.2 14 3.2 24 2.6 2.9 .99 7.5 2.2 27 10 2.4 10 1.1 15 2.2 99 5.1 2.9 .91 8.5 2.1 5.2 11 14 12 .96 16 1.9 17 3.4 3.4 .70 7.9 2.3 3.5 10 8.4 3.8 .86 17 1.5 11 3.3 5.4 1.7 1.8 2.3 3.2 0.2 10 2.8 .74 18 13 15 2.7 4.0 1.4 1.4 2.0 17 3.8 3.5 2.2 .65 19 13 7.6 4.4 2.8 18 1.1 1.8 5.6 6.6 2.7 1.9 .56 20 8.8 22 7.2 3.3 4.5 1.5 1.7 3.5 5.0 2.3 1.7 .49 21 4.3 24 7.1 3.9 1.9 1.2 3.5 3.3 4.2 2.4 1.5 .99 22 6.3 5.3 9.9 3.1 1.5 .81 1.9 3.5 3.3 2.0 1.7 1.9 23 53 5.9 4.6 5.4 1.3 .66 1.6 2.7 3.3 1.8 15 3.5 24 88 5.9 4.8 6.0 1.2 1.4 1.6 2.4 3.3 1.8 72 1.5 25 13 4.2 3.3 3.2 1.1 4.3 1.4 2.1 2.6 1.8 8.2 2.5 26 7.8 3.4 4.2 2.3 .95 1.6 1.3 1.9 3.3 1.5 3.9 2.3 27 7.2 3.0 2.7 2.0 .86 2.6 1.9 1.9 11 1.5 3.2 4.8 28 5.8 2.6 5.1 1.8 .86 7.1 8.5 2.8 3.6 1.5 43 2.6 29 8.6 2.6 2.9 1.7 --- 23 19 4.1 2.7 34 27 4.6 30 5.5 5.0 2.3 2.9 --- 6.8 8.7 3.0 2.3 22 5.5 2.3 31 5.9 --- 2.1 2.2 9.4 --- 12 --- 5.4 4.4 --- TOTAL 530.7 386.7 134.8 139.6 94.44 103.01 153.8 248.3 147.9 176.3 294.60 70.15 MEAN 17.1 12.9 4.35 4.50 3.37 3.32 5.13 8.01 4.93 5.69 9.50 2.34 MAX 132 99 12 20 22 23 28 50 13 34 72 7.7 MIN 1.5 2.0 2.1 1.7 .70 .51 1.3 1.8 1.5 1.5 .69 .49 CFSM 16.9 12.8 4.31 4.46 3.34 3.29 5.08 7.93 4.88 5.63 9.41 2.32 IN. 19.55 14.24 4.96 5.14 3.48 3.79 5.66 9.15 5.45 6.49 10.85 2.58 AC-FT 1050 767 267 277 187 204 305 493 293 350 584 139 CAL YR 1985 TOTAL 2737.98 MEAN 7.50 MAX 132 MIN .23 CFSM 7.43 IN. 100.84 AC-FT 5430 WTR YR 1986 TOTAL 2480.30 MEAN 6.80 MAX 132 MIN .49 CFSM 6.73 IN. 91.35 AC-FT 4920 190 191 RIO ESPIRITU SANTO BASIN 50063440 QUEBRADA SONADORA NEAR EL VERDE, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS APRIL 1983 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 DATE TIME MAY, 15 1450 JUN, 20 0929 JUL, 15 1035 STREANFLOW, INSTANTANEOUS (CFS) 4.8 4.3 17 SPECIFIC CON- DUCTANCE (UMHOS) 50 51 59 TEMPERA- TURE (DEG C) 21.5 21.5 22.0 DATE TIME AUG, 19 0958 SEP, 11 0937 STREAMFLOW, INSTANTANEOUS (CFS) 2.0 1.5 SPECIFIC CON- DUCTANCE (UMHOS) 60 64 TEMPERA- TURE (DEG C) 22.5 22.5 192 RIO ESPIRITU SANTO BASIN 50063500 QUEBRADA TORONJA AT EL VERDE. PR LOCATION.--Lat 18°19'43% long 65'49E14", Hydrologic Unit 21010005, in Caribbean National Forest, at downstream side of culvert on Highway 186, 0.2 mi (0.3 km) upstream from Rio Espiritu Santo, and about 0.9 mi (1.4 km) south of El Verde. DRAINAGE AREA.--0.064 mi' (0.166 km'). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--April 1983 to current year. GAGE.--Water-stage recorder and concrete broad-V-notch crested weir. Elevation of gage is 876 ft (267 m), from topographic map. REMARKS.--No estimated daily discharges during water year. Records poor. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 18 ft'iis (0.51 m'/s), July 5, 1983, gage height, 1.71 ft (0.521 m), from rating curve extended above 1.0 ft'/s (0.03 m'/s) on basis of step-backwater analysis; minimum discharge, no flow for part of each day Apr. 10, 17, 1983. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 13 ft'/s (0.37 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (10/s) (ft) (m) Date Time (W/s) (m'/s) (ft) (m) Oct. 24 1530 *17 0.48 *1.69 0.515 May 14 0030 14 0.40 1.64 0.500 May 1 2115 13 0.37 1.63 0.497 Aug. 24 1930 14 0.40 1.65 0.503 Minimum discharge. 0.04 ft'is (0.001 ms/s), July 8-14, 18-24. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 .32 .50 .15 .11 .07 .08 .09 1.7 .24 .08 .13 .87 2 .49 .45 .12 .13 .09 .08 .06 1.1 .21 .09 .09 .40 3 .67 .35 .10 .21 .21 .07 .32 .45 .18 .07 .09 .30 4 .44 .33 .09 .26 .98 .08 .25 .26 .18 .05 .09 .27 5 .92 .42 .15 .13 .25 .07 .31 .22 .17 .09 .08 .24 6 6.8 .31 .12 .12 .14 .07 .21 .25 .17 .11 .07 .18 7 5.2 .27 .10 .11 .12 .07 .10 .66 .17 .07 .11 .15 8 2.0 .25 .09 .13 .10 .07 .11 .34 .15 .05 .07 .14 9 1.5 .27 .08 .59 .09 .08 .09 .57 .26 .05 .07 .14 10 1.1 .24 .08 .18 .08 .08 .06 .67 .34 .05 .09 .13 11 .93 .43 .08 .14 .08 .08 .06 .63 .16 .04 .22 .11 12 .78 1.7 .19 .12 .07 .08 .05 .37 .17 .06 .17 .11 13 .58 2.8 .12 .12 .07 .16 .06 2.9 .23 .04 1.6 .09 14 .49 1.7 .11 .13 .07 .18 .05 2.9 .21 .06 .49 .09 15 .45 5.3 .14 .15 .07 .19 .05 .80 .21 .26 .36 .09 16 .42 1.9 .10 .14 .06 .17 .07 .48 .35 .07 .18 .08 17 .40 1.2 .08 .16 .07 .08 .08 .45 .17 .08 .15 .08 18 .56 1.2 .08 .14 .06 .07 .06 .96 .13 .05 .13 .07 19 .82 .71 .09 .12 .13 .08 .06 .44 .13 .04 .11 .07 20 .71 .83 .14 .13 .09 .07 .06 .35 .12 .04 .09 .07 21 .42 1.1 .15 .12 .06 .07 .27 .30 .11 .04 .08 .09 22 .44 .48 .26 .12 .05 .07 .07 .25 .09 .04 .09 .09 23 3.3 .45 .13 .10 .05 .06 .06 .22 .09 .04 .16 .08 24 4.5 .36 .13 .10 .05 .08 .06 .21 .08 .10 1.5 .07 25 2.3 .36 .10 .08 .07 .12 .06 .20 .08 .08 .62 .09 26 1.3 .27 .11 .07 .08 .06 .06 .18 .10 .07 .23 .09 27 1.0 .22 .09 .07 .08 .06 .08 .19 .13 .07 .20 .12 28 .80 .20 .10 .06 .08 .06 .22 .63 .09 .08 2.2 .14 29 .80 .18 .13 .07 .59 .27 .58 .08 .89 1.9 .15 30 .66 .20 .11 .07 .11 .71 .27 .08 .71 .54 .06 31 .63 --- .12 .08 .11 --- .45 --- .19 .39 --- TOTAL 41.73 24.98 3.64 4.26 3.42 3.30 4.06 19.98 4.88 3.76 12.30 4.66 MEAN 1.35 .83 .12 .14 .12 .11 .14 .64 .16 .12 .40 .16 MAX 6.8 5.3 .26 .59 .98 .59 .71 2.9 .35 .85 2.2 .87 MIN .32 .18 .08 .06 .05 .06 .05 .18 .08 .04 .07 .06 CFSM 21.1 13.0 1.87 2.19 1.87 1.72 2.19 10.0 2.50 1.87 6.25 2.50 IN. 24.26 14.52 2.12 2.48 1.99 1.92 2.36 11.61 2.84 2.19 7.15 2.71 AC-FT 83 50 7.2 8.4 6.8 6.5 8.1 40 9.7 7.5 24 9.2 CAL YR 1985 TOTAL 148.74 MEAN .41 MAX 6.8 MIN .03 CFSM 6.41 IN. 86.46 AC-FT 295 WTR YR 1986 TOTAL 130.97 MEAN .36 MAX 6.8 MIN .04 CFSM 5.62 IN. 76.13 AC-FT 260 193 RIO ESPIRITU SANTO BASIN 50063500 QUEBRADA TORONJA AT EL VERDE, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS APRIL 1983 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (US) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) MAY, 15 1543 0.59 82 22.5 AUG, 19 1143 0.10 119 23.5 JUN, 20 1121 .10 117 23.0 SEP, 11 1122 .11 119 24.5 JUL, 15 1256 .20 111 23.0 I 194 RIO ESPIRITU SANTO BASIN 50063800 RIO ESPIRITU SANTO NEAR RIO GRANDE. PR LOCATION.--Lat 18°21'37', long 65°48'49', Hydrologic Unit 21010005, at left abutment, on downstream side of bridge on Highway 966. 0.1 mi (0.2 km) upstream from Quebrada Jimenez, and 1.9 mi (3.1 km) southeast of Rio Grande. DRAINAGE AREA.--8.62 mil (22.33 km'). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--February 1959 to April 1963 (annual low-flow and occasional measurements only), August 1966 to current year. GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 40 ft (12 ), from topographic map. REMARKS.--Estimated daily discharges: Oct. 2, 5-8, June 15. 16, 27 and Aug. 31 to Sept. 8. Records fair except those for estimated daily discharges, which are poor. AVERAGE DISCHARGE.--20 years (1967-86), 57.5 ft'is (1.628 m'/s), 90.59 in/yr (2,301 mm/yr), 41,660 acre-ft/yr (51.4 hm,/yr); median of yearly mean discharges, 52 ft'/s (1.47 10/s), 37,700 acre-ft/yr (46 hi0/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum dis.charge, 12,400 ft'is (351 10/s), Dec. 2, 1983, gage height, 12.07 ft (3.679 m), from rating curve extended above 600 ft'/s (17.0 0/s) on basis of step-backwater analysis; minimum discharge. 4.0 ft'is (0.113 m'/s), July 3-5, 1975, Apr. 14, 15, 1984. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 3,000 ft'/s (85.0 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (10/s) (ft) (m) Date lime (W/s) (e/s) (ft) (m) Oct. 6 unknown 3,490 98.8 7.59 2.313 July 29 1645 3,240 91.8 7.40 2.256 Oct. 24 1430 *7,400 210 *9.94 3.030 Aug. 13 1845 5,190 147 8.74 2.664 Nov. 15 1345 3,150 89.2 7.32 2.231 Aug. 24 1845 6,480 184 9.47 2.886 May 13 0915 6,330 179 9.39 2.862 Minimum discharge, 7.7 ft'is (0.218 m3 /s), July 26, 27. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 30 41 31 19 17 11 35 283 36 17 24 54 2 130 48 33 31 35 11 23 227 22 18 17 36 3 83 36 25 60 46 10 80 90 19 30 14 30 4 45 40 26 106 207 11 51 23 18 18 15 27 5 150 60 59 28 84 13 210 18 17 28 12 26 6 850 38 42 22 40 10 77 24 16 63 11 30 7 530 29 30 20 27 11 27 95 15 44 28 30 8 170 25 22 22 21 9.7 49 36 18 20 14 23 9 86 24 29 174 18 12 26 87 70 16 14 20 10 62 23 31 52 16 12 16 74 72 15 13 19 11 50 68 39 33 16 18 14 96 32 14 118 18 12 41 332 88 25 15 14 13 27 26 25 53 17 13 36 492 37 22 14 27 13 741 54 16 446 17 14 35 213 22 20 14 38 12 386 73 14 105 19 15 30 1170 38 20 15 77 11 51 85 91 67 17 16 28 217 27 22 13 58 28 34 100 28 24 17 17 29 120 25 33 15 17 14 28 39 67 19 16 18 164 185 22 30 17 13 11 122 27 19 15 16 19 135 81 26 20 75 11 11 44 36 14 14 15 20 97 124 50 21 43 12 10 28 32 12 13 15 21 42 310 48 26 17 12 101 25 27 11 13 16 22 39 65 93 20 14 9.9 13 27 23 11 13 22 23 630 60 40 31 14 9.3 11 22 21 9 9 75 25 24 995 68 37 41 13 12 10 20 20 11 452 18 25 167 55 24 25 12 21 9.5 18 18 11 78 22 26 129 39 32 18 12 15 9.0 18 17 8.4 24 22 27 86 34 22 17 11 17 12 20 70 8.5 19 34 28 59 32 36 16 11 41 32 92 21 9.1 431 21 29 89 31 22 16 188 140 89 17 360 325 34 30 53 45 18 20 39 166 36 16 228 46 21 31 56 --- 17 18 37 --- 125 --- 52 41 --- TOTAL 5126 4105 1091 1028 852 796.9 1234.5 3006 1057 1288.9 2553 697 MEAN 165 137 35.2 33.2 30.4 25.7 41.1 97.0 35.2 41.6 82.4 23.2 MAX 995 1170 93 174 207 188 210 741 100 360 452 54 MIN 28 23 17 16 11 9.3 9.0 18 15 . 8.4 11 15 CFSM 19.1 15.9 4.08 3.85 3.53 2.98 4.77 11.3 4.08 4.83 9.56 2.69 IN. 22.12 17.72 4.71 4.44 3.68 3.44 5.33 12.97 4.56 5.56 11.02 3.01 AC-FT 10170 8140 2160 2040 1690 1580 2450 5960 2100 2560 5060 1380 CAL YR 1985 TOTAL 25171.2 MEAN 69.0 MAX 1170 MIN 5.9 CFSM 8.00 IN. 108.63 AC-FT 49930 WTR YR 1986 TOTAL 22835.3 MEAN 62.6 MAX 1170 MIN 8.4 CFSM 7.26 IN. 98.55 AC-FT 45290 195 RIO ESPIRITU SANTO BASIN 50063800 RIO ESPIRITU SANTO NEAR RIO GRANDE, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORD.--Water years 1958, 1961-66, 1968 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1985 24... 1100 555 70 7.70 23.5 44 9.4 27 620 K4000 DEC 13... 1130 36 103 7.50 21.0 2.6 6.2 52 3500 2000 FEB 1986 12... 1045 15 121 7.90 22.5 1.5 8.4 11 490 200 APR 17... 1025 15 106 7.80 24.0 44 9.0 108 15 K1800 820 JUL 03... 1000 41 92 7.45 26.0 5.2 8.6 106 40 3000 930 SEP 08... 1205 21 100 7.45 27.0 0.70 8.5 107 <10 K620 270 HARD- ALKA- NESS MAGNE- SODIUM ROTAS- LINITY CHLO- HARD- NONCARB CALCIUM SIUM, SODIUM, AO- SIUM, WATER SULFATE RIDE, NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1985 24... 9 0 1.9 1.1 3.5 0.5 0.30 13 <0.5 7.5 4.4 DEC 13... 23 FEB 1986 12... 38 APR 17... 32 0 6.8 3.7 7.8 0.6 0.60 32 <0.5 4.9 10 JUL 03... 28 SEP 08... 32 0 6.6 3.8 7.7 0.6 0.60 33 4.7 9.1 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1985 24... <0.10 6.2 33 49 59 0.020 <0.100 0.040 0.36 DEC 13... 1 0.160 0.140 0.300 5.80 2.4 FEB 1986 12... 1 <0.010 <0.100 0.010 0.19 APR 17... <0.10 20 73 2.9 6 <0.010 <0.100 0.040 0.26 JUL 03... 10 <0.010 <0.100 <0.010 SEP 08... <0.10 20 72 4.1 4 <0.010 <0.100 <0.010 K = non-ideal count RIO ESPIRITU SANTO BASIN 50063800 RIO ESPIRITU SANTO NEAR RIO GRANDE, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1985 24... 0.40 0.040 <1 <100 30 1 1 10 DEC 13... 8.2 8.5 38 1.50 FEB 1986 12... 0.20 <0.010 APR 17... 0.30 0.020 <1 100 ,-10 <1 10 10 JUL 03... 0.30 0.010 SEP 08... 0.20 0.020 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1985 24... 2000 1 40 <0.10 <1 <1 30 <0.010 <1 0.05 DEC 13,.. FEB 1986 12... APR 17... 260 2 20 <0.10 <1 <1 240 <0.010 2 0.04 JUL 03... SEP 08... 196 I I 197 RIO MAMEYES BASIN 50065500 RIO MAMEYES NEAR SABANA, PR LOCATION.--Lat 18°19'46", long 65°45'04", 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 Maseyes. DRAINAGE AREA.--6.88 all' (17.82 km 2). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--August 1967 to December 1973. June 1983 to current year. GAGE.--Water-stage recorder. Elevation of gage is 275 ft (84 m), fro topographic map. REMARKS.--Estimated (tally discharges: Nov. 2-14. Records fair except those for estimated daily discharges, which are poor. AVERAGE DISCHARGE.--3 years (1968-73, 1984-86), 58.0 ft'is (1.642 m'/s), 114.48 in/yr (2,908 mm/yr), 42,000 acre-ft/vr (51.8 hm'/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 19,800 ft'/s (561 m 3/s), Sept. 4, 1973, gage height, 13.02 ft (3.968 m), from rating curve extended above 1,800 ft'is (51.0 m'/s) on basis of slope-area measurement of peak flow; minimum discharge, 5.1 ft'is (0.144 '/s), Apr. 8, 9, 1970. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 4,000 ft'is (113 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (0/s) (ft) (m) Date Time (ft'/s) (els) (ft) (m) Oct. 6 1515 5,850 166 8.57 2.612 May 13 0915 8,160 231 9.56 2.914 Oct. 24 0515 6,660 139 8.94 2.725 Aug. 13 2030 *9,700 275 *10.12 3.084 Nov. 15 1515 4,230 120 7.70 2.347 Aug. 24 1930 4,620 131 7.93 2.417 Minimum daily discharge, 9.0 ft'is (0.255 m'/s), Mar. 8. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 113 57 33 35 23 10 27 314 45 30 55 108 2 115 82 34 43 37 9.9 17 103 28 34 32 47 3 82 56 31 61 47 9.6 17 73 25 35 38 34 4 59 50 33 77 141 11 43 50 23 27 29 30 5 113 80 73 38 58 11 253 42 23 37 26 35 6 1100 49 43 32 29 11 68 46 20 44 23 42 7 340 42 35 30 28 14 35 200 19 63 28 26 8 139 40 32 30 23 10 37 61 22 34 24 25 9 92 38 46 156 21 15 29 73 50 34 22 23 10 70 37 44 53 19 13 24 75 67 31 24 23 11 58 37 46 39 19 16 22 86 27 28 66 21 12 50 130 84 33 19 13 20 43 28 42 90 20 13 48 100 43 30 18 28 19 324 59 32 675 20 14 50 110 33 29 19 31 19 207 62 32 72 20 15 41 572 56 28 18 42 19 67 74 48 80 19 16 39 156 37 31 17 26 43 48 70 31 27 18 17 35 106 36 34 18 15 23 42 47 51 26 17 18 70 109 35 30 15 13 19 192 31 44 24 18 19 94 74 45 26 84 12 19 68 61 34 22 17 20 63 87 66 28 24 12 18 43 44 29 21 18 21 48 172 58 31 14 11 82 42 39 28 20 20 22 47 64 94 26 12 10 53 65 37 24 23 19 23 342 66 60 43 12 9.9 43 35 33 23 66 20 24 669 59 49 44 11 11 44 31 30 35 300 16 25 157 51 38 30 11 16 37 28 28 28 73 20 26 117 43 41 25 10 14 35 25 32 29 41 24 27 95 39 32 24 10 14 60 30 69 24 34 30 28 71 35 47 23 11 189 121 26 32 26 206 19 29 98 34 33 22 158 160 97 30 135 175 25 30 65 48 30 25 33 444 32 28 140 57 24 31 82 --- 28 26 47 --- 179 --- 45 44 --- TOTAL 4562 2654 1395 1182 768 835.4 1850 2747 1183 1277 2443 798 MEAN 147 88.5 45.0 38.1 27.4 26.9 61.7 88.6 39.4 41.2 78.8 26.6 MAX 1100 572 94 156 141 189 444 324 74 140 675 108 MIN 35 34 28 22 10 9.6 17 25 19 23 20 16 CFSM 21.4 12.9 6.54 5.54 3.98 3.91 8.97 12.9 5.73 5.99 11.5 3.87 IN. 24.67 14.35 7.54 6.39 4.15 4.52 10.00 14.85 6.40 6.90 13.21 4.31 AC-FT 9050 5260 2770 2340 1520 1660 3670 5450 2350 2530 4850 1580 CAL YR 1985 TOTAL 19962.0 MEAN 54.7 MAX 1100 MIN 9.2 CFSM 7.95 IN. 107.93 AC-FT 39590 WTR YR 1986 TOTAL 21694.4 MEAN 59.4 MAX 1100 MIN 9.6 CFSM 8.63 IN. 117.30 AC-FT 43030 198 RIO MAMEYES BASIN 50065500 RIO MAMEYES NEAR SABANA, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS JUNE 1983 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA­ DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTA4TANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) JUN, 18 0949 32 93 23.0 AUG, 15 1036 70 77 23.5 JUL, 17 0952 41 90 23.5 SEP, 09 0944 24 108 24.5 199 RIO SABANA BASIN 50067000 RIO SABANA AT SABANA, PR LOCATION.--Lat 18°19'52", long 65°43'52", Hydrologic Unit 21010005, on right bank along Highway 988, 0.3 mi (0.5 km) north of junction of Highways 988 and 983 in Sabana, and 3.3 mi (5.3 km) south of Luquillo. DRAINAGE AREA.--3.96 mil (10.26 km2). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--Oc:ober 1979 to current year. GAGE.--Water-stage recorder and crest-stage gagee. Elevation of gage is 260 ft (80 m), from topographic map. REMARKS.--Estimated daily discharges: Nov. 2-13. Records fair except those for estimated daily discharges, which are poor. AVERAGE DISCHARGE.--7 years (1980-36), 18.3 ft3/s (0.518 m3/s), 62.76 in/yr (1,594 mm/yr), 13,260 acre-ft/yr (16.3 hm 3/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 9,010 ft'is (255 m'/s), Apr. 21, 1983, gage height, 19.35 ft .ixtended above 200 ft3/s (5.66 e/s) on basis of step-backwater analysis and slope-area measurement; minimum discharge, 0.86 ft3/s (0.024 10/s), Apr. 17, 1983. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,500 ft3/s (42.5 le/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft3/s) (m 3/s) (ft) (m) Date Time (ft3/s) (m 3/s) (ft) (m) Oct. 6 1330 2,200 62.3 13.19 4.020 May 13 0915 *2,260 64.0 *13.27 4.045 Oct. 24 0445 1,760 49.8 12.55 3.825 Aug. 13 1845 2,000 56.6 12.90 3.932 Nov. 15 1515 1,610 45.6 12.30 3.749 Aug. 24 1615 1,710 48.4 12.46 3.798 Minimum discharge, 1.3 ft'ils (0.037 e/s), Aug. 21, 22. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 (5.898 m), from flocdmark, from rating cur.e. ­ MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 16 21 13 6.2 3.3 3.3 10 92 28 4.5 6.7 79 2 22 82 12 7.7 4.9 2.3 4.2 34 18 5.7 4.6 16 3 30 33 12 6.6 12 2.1 3.4 45 16 5.4 4.4 9.9 4 11 28 11 10 30 3.0 3.3 17 14 4.0 4.8 8.1 5 23 26 20 6.4 15 2.9 96 11 16 10 3.7 20 6 713 25 13 5.7 6.1 2.5 14 16 12 9.6 3.9 13 7 169 22 11 5.3 5.3 4.4 5.6 160 11 8.9 4.3 7.9 8 49 20 10 5.0 4.0 2.3 6.1 21 9 8 5.5 3.5 6.2 9 33 19 12 29 3.4 3.7 4.5 21 17 3.7 3.4 5.6 10 27 18 11 10 3.2 2.3 3.2 23 17 3.5 5.0 5.2 11 25 46 9.9 6.3 3.1 2.7 3.0 25 11 3.3 6.4 4.7 12 21 130 16 5.3 3.0 2.2 2.8 10 9 9 4.3 9.8 4.6 13 20 115 10 5.0 2.5 2.7 2.7 190 13 3.1 136 4.3 14 20 49 8.7 4.5 3.5 2.8 2.6 139 16 3.2 76 3.9 15 17 353 10 4.6 3.1 2.9 2.7 26 16 5.6 12 3.6 16 16 56 8.7 5.2 2.5 2.6 5.0 18 24 3.7 5.2 3.5 17 14 35 8.9 4.4 2.6 2.9 3.5 15 13 5.2 2.6 3.2 18 29 29 8.4 3.8 2.7 2.6 2.5 75 8.4 3.3 2.0 3.1 19 32 26 10 3.7 9.2 2.6 2.3 22 19 2.5 1.9 2.9 20 19 33 15 3.9 4.3 2.5 2.2 16 9.1 2.4 1.7 2.9 21 19 57 12 5.7 2.5 2.5 3.3 17 7.5 2.9 1.5 3.3 22 14 22 19 4.6 2.4 2.3 3.1 44 6.7 2.3 1.5 3.4 23 117 21 16 7.4 2.2 2.3 2.4 13 6.1 2.3 3.1 3.1 24 350 19 11 8.1 2.1 2.4 2.7 10 6.0 4.8 117 2.5 25 59 19 8.8 5.0 2.2 3.5 2.1 9.0 5.5 3.4 18 3.1 26 33 17 9.5 3.6 2.1 3.0 2.0 8.3 6.3 2.1 5.9 3.4 27 34 16 7.6 3.1 2.4 2.8 36 26 22 2.0 4.0 5.7 28 25 15 9.0 3.2 3.7 66 76 21 5.9 2.8 156 4.3 29 48 14 7.3 2.9 --- 49 171 91 5.1 11 143 4.3 30 26 17 6.6 3,7 7.2 195 21 4.9 36 19 3.1 31 26 --- 6.2 3.7 22 --- 143 --- 14 13 --- TOTAL 2057 1385 343.6 189.6 143.3 218.3 673.2 1379.3 374.2 181.0 780.4 243.8 MEAN 66.4 46.2 11.1 6.12 5.12 7.04 22.4 44.5 12.5 5.84 25.2 8.13 MAX 713 353 20 29 30 66 195 190 28 36 156 79 MIN 11 14 6.2 2.9 2.1 2.1 2.0 8.3 4.9 2.0 1.5 2.5 CFSM 16.8 11.7 2.80 1.55 1.29 1.78 5.66 11.2 3.16 1.47 6.36 2.05 IN. 19.32 13.01 3.23 1.78 1.35 2.05 6.32 12.96 3.52 1.70 7.33 2.29 AC-FT 4080 2750 682 376 284 433 1340 2740 742 359 1550 484 CAL YR 1985 TOTAL 7466.9 MEAN 20.5 MAX 713 MIN 1.2 CFSM 5.18 IN. 70.14 AC-FT 14810 WTR YR 1986 TOTAL 7968.7 MEAN 21.8 MAX 713 MIN 1.5 CFSM 5.51 IN. 74.86 AC-FT 15810 200 RIO SABANA BASIN 50067000 RIO SABANA AT SABANA, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS AUGUST 1981 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) JUN, 18 1244 8.2 105 26.0 AUG, 15 1312 10 87 26.0 JUL, 17 1247 6.0 118 26.5 SEP. 09 1214 5.4 118 26.5 I I I 201 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 Penon, 1.1 mi (1.8 km) northeast of Colonia Paraiso, and 3.3 mi (5.3 km) southwest of Fajardo. DRAINAGE AREA.--14.9 i 2 (38.6 km 2). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--1960-61 (occasional low and peak-flow measurements only), March 1961 to current year. GAGE.--Water-stage recorder. Elevation of gage is 137.60 ft (41.940 m) above mean sea level. Due to flood damage, gage datum has had changes as follows: Mar. 24, 1961 to May 5, 1969, 138.95 ft (42.352 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.--Estimated daily discharges: July 23 to Aug. 4. 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 (esti­ mated mean daily discharge is 9.0 ft'is (0.255 m 3/s). AVERAGE DISCHARGE.--25 years (1962-86), 67.7 ft'is (1.917 m'/s), 61.70 in/yr (1,567 mm/yr), 49,050 acre-ft/yr (60.5 hie/yr); median of yearly mean discharges, 68 ftYs (1.32 m 3/s), 49,300 acre-ft/yr (61 hmYyr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 19,600 ft'is (555 '/s), Oct. 24, 1974, gage height, 13.62 ft (4.151 ), datum then in use, from rating curve extended above 100 ft'/s (2.83 10/s) on basis of step-backwater analyses and slope-area measurements of peak discharges; minimum discharge, 0.86 ftqs (0.024 leis), May 3, 1984. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 3,500 ft'is (99.1 m 3/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (e/s) (ft) (m) Date Time (W/s) (10/s) (ft) (m) Oct. 6 1530 6,760 191 10.41 3.173 May 13 0945 *7,900 224 *11.15 3.398 May 7 0330 3,860 109 8.17 2.490 Minimum discharge, 4.1 ft'is (0.110 10/s), Apr. 26, 27. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 57 102 42 34 22 6.6 13 338 64 16 32 188 2 227 217 42 46 29 5.8 8.7 131 41 15 24 43 3 146 74 37 41 26 5.6 7.3 84 34 18 23 30 4 66 61 34 66 292 5.9 22 32 31 17 25 27 5 76 57 85 32 74 6.5 272 19 31 19 17 48 6 2120 54 45 27 31 6.2 60 48 25 36 16 97 7 555 47 37 23 25 11 19 488 25 31 16 30 8 165 42 35 22 21 6.4 21 69 24 23 16 24 9 86 39 49 217 18 8.6 15 190 35 16 15 21 10 57 37 50 48 17 7.4 11 166 47 15 16 19 11 47 123 42 32 18 7.6 12 162 30 14 47 17 12 38 354 50 26 14 8.2 7.5 49 45 19 39 16 13 30 418 38 24 15 25 7.1 575 48 15 184 16 14 26 292 31 22 13 39 6.2 374 38 16 70 15 15 23 911 45 21 12 55 5.6 44 65 62 50 15 16 20 246 37 29 10 17 8.3 29 50 26 25 14 17 21 171 41 26 13 9.8 9.5 24 49 34 18 13 18 287 153 35 20 13 7.3 5.6 376 26 21 15 12 19 58 125 40 19 18 6.6 4.6 70 31 18 14 12 20 32 124 50 20 20 7.0 4.4 32 25 17 13 11 21 48 185 49 26 9.7 6.2 8.9 32 23 18 13 11 22 41 83 74 21 8.5 5.2 11 32 21 15 16 12 23 428 82 50 36 7.5 4.7 6.7 23 18 15 24 17 24 945 75 40 56 7.1 4.6 11 21 18 25 241 14 25 222 62 31 31 7.7 7.9 6.0 19 18 20 62 11 26 209 55 37 20 7.2 11 4.4 19 17 15 23 13 27 162 50 27 17 6.6 14 33 24 52 14 17 19 28 110 47 36 16 7.4 23 156 22 19 17 337 24 29 192 43 27 16 --- 62 504 136 18 47 481 14 30 97 62 24 21 18 360 32 16 136 72 23 31 106 --- 22 28 20 --- 421 --- 58 45 --- TOTAL 6697 4391 1282 1083 762.7 429.1 1620.8 4081 985 828 2006 826 MEAN 216 146 41.4 34.9 27.2 13.8 54.0 132 32.8 26.7 64.7 27.5 MAX 2120 911 85 217 292 62 504 575 65 136 481 188 MIN 20 37 22 16 6.6 4.6 4.4 19 16 14 13 11 CFSM 14.5 9.80 2.78 2.34 1.83 .93 3.62 8.86 2.20 1.79 4.34 1.85 IN. 16.72 10.96 3.20 2.70 1.90 1.07 4.05 10.19 2.46 2.07 5.01 2.06 AC-FT 13280 8710 2540 2150 1510 851 3210 8090 1950 1640 3980 1640 CAL YR 1985 TOTAL 24980.7 MEAN 68.4 MAX 2120 MIN 4.3 CFSM 4.59 IN. 62.37 AC-FT 49550 WTR YR 1986 TOTAL 24991.6 MEAN 68.5 MAX 2120 MIN 4.4 CFSM 4.60 IN. 62.40 AC-FT 49570 RIO FAJARDO BASIN 50071000 RIO FAJARDO NEAR FAJARDO, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORD.--Water years 1960 to current year. PERIOD OF GAILY RECORD.-- SUSPENDED-SEDIMENT DISCHARGE: October 1982 to current year. INSTRUMENTATION.--USD-49 Sediment sampler since February 1983. 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 were also collected periodically by survey staff. EXTREMES FOR PERIOD OF DAILY RECORD.-- SEDIMENT CONCENTRATIONS: Maximum daily mean, 2,210 mg/L October 6, 1985; Minimum daily mean, 2.0 mg/L several days. SEDIMENT LOADS: Maximum daily, 22,100 tons (20,000 tonnes) October 6, 1985; minimum daily, 0.02 tons (0.02 tonne) March 24, 1986. EXTREMES FOR CURRENT YEAR.-- SEDIMENT CONCENTRATIONS: Maximum daily mean, 2,210 mg/L October 6, 1985; Minimum daily mean, 2.0 mg/L several days. SEDIMENT LOADS: Maximum daily, 22,100 tons (20,000 tonnes) October 6, 1985; minimum daily, 0.02 tons (0.02 tonne) March 24, 1986. WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLT- STREP- SPE- DiS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1985 23... 1215 102 96 7.40 24.5 24 8.8 2300 4800 DEC 03... 1310 35 128 8.20 25.5 3.4 <10 360 160 FEB 1986 11... 1240 26 133 7.90 24.0 3.0 9.6 14 54 K32 APR 14... 1230 6.7 143 8.20 27.0 2.4 9.7 123 25 K140 K14 JUL 02... 1100 15 127 8.60 28.0 2.5 9.9 127 15 80 K1400 SEP 2... 1150 42 94 7.05 25.5 8.9 8.5 105 11 K1000 600 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- HARD- NONCARB CALCIUM SIUM, SODIUM, AD- SIUM, WATER SULFATE RiDE, NESS WATER DIS- CIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1985 23... 20 0 4.4 2.3 7.4 0.7 1.2 21 <.05 7.1 9.0 DEC 3... 39 FEB 1986 11... 34 APR 14... 36 0 7.7 4.1 12 0.9 1.2 43 <0.5 5.4 15 JUL 02... 41 SEP 02... 24 0 5.1 2.7 8.7 0.8 1.2 25 8.6 8.7 K = non-ideal count 202 RIO FAJARDO BASIN 50071000 RIO FAJARDO NEAR FAJARDC, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL. TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) 5102) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1985 23... <0.10 16 60 17 20 0.190 0.010 0.200 0.570 0.0 DEC 03... 1 <0.010 0.200 0.020 0.18 FEB 1986 11... 1 APR 14... <0.10 26 97 1.8 6 <0.010 0.100 0.030 0.47 JUL 02... 9 <0.010 <0.100 0.040 0.26 SEP 2... <0.10 20 70 7.9 8 <0.010 0.200 0.060 0.14 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, " COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL .TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CO) AS CR) AS CU) OCT .1985 23... 0.40 0.60 2.7 0.040 <1 <100 30 1 9 10 DEC 3... 0.20 0.40 1.8 0.020 FEB 1986 11... APR 14... 0.50 0.60 2.7 0.020 <1 <100 <10 2 10 30 JUL 02... 0.30 0.020 SEP 02... 0.20 0.40 1.8 0.020 -- MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, tENE TOTAL TOTAL TOTAL TOTAL .SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1985 23... 1900 5 50 <0.10 <1 <1 80 <0.010 4 0.05 DEC 03. FEB 1986 11... -- APR 14... 340 1 30 <0.10 <1 <1 30 <0.010 2 0.04 JUL 02... -- SEP 02... 203 204 RIO FAJARDO BASIN 50071000 RIO FAJARDO NEAR FAJARDO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 PESTICIDE ANALYSES CHLOR- DI- DI- PCB, ALDRIN, DANE, ODD, DDE, DDT, AZINON, ELDRIN DATE TIME DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUL 1986 02... 1100 <0.1 <0.01 <0.1 <0.01 <0.01 <0.01 <0.01 <0.01 HEPTA- METH- ENDO- HEPTA- CHLOR MALA- OXY- SULFAN, ENDRIN, ETHION, CHLOR, EPDXIDE LINDANE THION, CHLOR, DATE DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUL 1986 02... <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 NAPH- THA- METHYL METHYL LENES, PARA- TRI- PARA- POLY- PER- TOX- TRI- THION, THION, MIREX, THION, CHLOR. THANE APHENE, THION DATE DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUL 1986 02... <0.01 <0.01 <0.01 <0.01 <0.1 <0.1 <1 <0.01 205 RIO FAJARDO BASIN 50071000 RIO FAJARDO NEAR FAJARDO, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) OCTOBER NOVEMBER DECEMBER 1 57 21 5.5 102 58 36 42 20 2.4 2 227 134 170 217 176 353 42 19 2.2 3 146 107 77 74 37 7.6 37 17 1.6 4 66 13 2.4 61 29 4.8 34 16 1.4 5 76 25 5.9 57 27 4.1 85 63 34 6 2120 2210 22100 54 26 4.0 45 23 3.0 7 555 346 857 47 21 2.7 37 17 1.7 8 165 90 42 42 18 2.0 35 18 1.9 9 86 44 11 39 13 1.4 49 24 3.8 10 57 27 4.2 37 10 1.0 50 25 3.8 11 47 22 2.8 123 95 154 42 19 2.6 12 38 17 1.7 354 301 538 50 16 2.5 13 30 14 1.1 418 291 1020 38 6 .63 14 26 12 .84 292 240 409 31 4 .33 15 23 11 .68 911 865 4170 45 22 3.2 16 20 9 .49 246 171 147 37 17 1.8 17 21 9 .51 171 101 51 41 20 2.4 18 287 415 3260 153 102 54 35 17 1.7 19 58 27 6.7 125 72 29 40 19 2.2 20 32 15 1.3 124 71 26 50 25 4.1 21 48 25 4.4 185 143 182 49 26 5.8 22 41 39 53 83 41 9.2 74 33 7.9 23 428 394 1530 82 41 9.4 50 26 4.1 24 945 851 3710 75 37 7.7 40 21 2.5 25 222 155 148 62 30 5.0 31 11 .93 26 209 145 157 55 27 4.0 37 19 2.2 27 162 91 56 50 24 3.2 27 13 .95 28 110 60 20 47 21 2.6 36 17 1.9 29 192 132 115 43 20 2.4 27 14 1.0 30 97 52 15 62 32 6.8 24 12 .79 31 106 64 26 --- --- --- 22 11 .73 TOTAL 6697 32385.52 4391 7246.9 1282 106.06 206 RIO FAJARDO BASIN 50071000 RIO FAJARDO NEAR FAJARDO. PR--Continued SEDIMENT DISCHARGE. SUSPENDED (TONS/DAY). WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DIcC14ARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) tCFS) (MG/L) (TONS/DAY) JANUARY FEBRUARY MARCH 1 34 19 2.7 22 10 .67 6.6 8 .14 2 46 20 3.8 29 15 1.7 5.8 5 .08 3 41 27 7.1 26 15 2.1 5.6 5 .08 4 66 37 10 292 302 794 5.9 8 .14 5 32 15 1.3 74 41 14 6.5 8 .13 6 27 10 .73 31 14 1.1 6.2 7 .17 7 23 10 .62 25 11 .74 11 10 .37 8 22 10 .59 21 10 .57 6.4 5 .09 9 217 180 384 18 8 .39 8.6 12 .41 10 48 33 5.3 17. 8 .37 7.4 4 .08 11 32 14 1.2 18 10 .48 7.6 3 .05 12 26 12 .84 14 6 .23 8.2 4 .08 13 24 11 .71 15 9 .52 25 13 1.7 14 22 9 .53 13 5 .18 39 22 4.0 15 21 9 .51 12 7 .23 55 26 8.9 16 29 13 1.2 10 7 .19 17 8 .43 17 26 13 .94 13 7 .25 9.8 5 .14 18 20 9 .49 13 6 .21 7.3 4 .08 19 19 8 .41 18 9 .74 6.6 3 .05 20 20 6 .32 20 13 1.1 7.0 4 .08 21 26 11 .85 9.7 7 .18 6.2 3 .05 22 21 .11 .68 8.5 5 .11 5.2 2 .03 23 36 16 1.7 7.5 5 .10 4.7 2 .03 24 56 22 4.3 7.1 5 .10 4.6 2 .02 25 31 14 1.4 7.7 5 .10 7.9 5 .13 26 20 9 .49 7.2 4 .08 11 6 .36 27 17 6 .28 6.6 8 .14 14 10 .56 28 16 6 .26 7.4 9 .22 23 19 4.1 29 16 6 .26 --- --- 62 35 11 30 21 10 .44 --- 18 7 .46 31 28 13 1.1 20 10 .72 TOTAL 1083 435.05 762.7 820.80 429.1 34.66 207 RIO FAJARDO BASIN 50071000 RIO FAJARDO NEAR FAJARDO, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) APRIL MAY JUNE 1 13 6 .23 338 277 1050 64 26 6.3 2 8.7 5 .17 131 111 130 41 13 1.4 3 7.3 5 .13 84 71 101 34 15 1.3 4 22 15 4.2 32 19 2.2 31 14 1.2 5 272 236 643 19 14 .85 31 10 .84 6 60 43 25 48 36 47 26 10 .70 7 19 7 .36 488 468 1050 25 11 .74 8 21 10 .81 69 36 9.1 24 11 .71 9 15 7 .32 190 197 640 35 31 4.1 10 11 5 .16 166 286 383 47 31 6.5 11 12 5 .16 162 122 105 30 14 1.2 12 7.5 4 .08 49 24 3.4 45 27 4.1 13 7.1 3 .06 575 517 5890 48 28 6.1 14 6.2 3 .05 374 295 1030 38 21 2.7 15 5.6 3 .04 44 21 2.6 65 38 11 16 8.3 5 .14 29 13 1.0 50 29 5.7 17 9.5 8 .22 24 7 .51 49 37 10 18 5.6 5 .08 376 354 1230 26 11 .78 19 4.6 3 .04 70 43 15 31 19 2.0 20 4.4 3 .04 32 15 1.3 25 14 .94 21 8.9 5 .14 32 17 1.9 23 10 .64 22 11 5 .17 32 17 2.0 21 9 .54 23 6.7 3 .06 23 11 .68 18 7 .34 24 11 17 .74 21 10 .57 18 7 .34 25 6.0 5 .08 19 8 .41 18 8 .39 26 4.4 5 .06 19. 8 .41 17 9 .52 27 33 19 5.6 24 12 1.1 52 34 19 28 156 128 278 22 12 .76 19 5 .26 29 504 558 2040 136 109 239 18 4 .19 30 360 445 1290 32 21 2.0 16 3 .13 31 --- --- --- 421 321 1290 --- --- TOTAL 1620.8 4290.14 4081 13230.79 985 90.66 208 RIO FAJARDO BASIN 50071000 RIO FAJARDO NEAR FAJARDO, PR--Continued SEDIMENT DISCHARGE. SUSPENDED (TONS/DAY). WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) kCFS) (MG/L) (TONS/DAY) JULY AUGUST SEPTEMBER 1 16 3 .13 32 20 1.7 188 117 384 2 15 6 .24 24 11 .71 43 12 1.7 3 18 8 .39 23 10 .62 30 9 .73 4 17 10 .46 25 11 .74 27 9 .65 5 19 9 .62 17 8 .37 48 27 6.6 6 36 19 2.5 16 6 .26 97 67 40 7 31 16 1.5 16 3 .13 30 14 1.1 8 23 11 .85 16 2 .09 24 11 .71 9 16 8 .35 15 4 .16 21 14 .79 10 15 6 .24 16 8 .35 19 13 .67 11 14 7 .26 47 31 19 17• 11 .50 12 19 11 .67 39 33 12 16 10 .43 13 15 9 .36 184 178 552 16 9 .39 14 16 9 .42 70 43 15 15 7 .28 15 62 32 7.9 50 28 7.0 15 6 .24 16 26 17 1.2 25 9 .58 14 7 .26 17 34 20 1.9 18 6 .29 13 9 .32 18 21 10 .58 15 5 .20 12 9 .29 19 18 8 .39 14 3 .11 12 9 .29 20 17 7 .32 13 2 .07 11 9 .27 21 18 7 .34 13 2 .07 11 8 .24 22 15 7 .28 16 5 .25 12 5 .16 23 15 7 .28 24 13 2.4 17 7 .32 24 25 4 .16 241 179 278 14 6 .23 25 20 10 .54 62 51 27 11 5 .15 26 15 7 .28 23 11 .67 13 5 .18 27 14 6 .23 17 7 .33 19 8 .41 28 17 8 .37 337 268 884 24 13 1.3 29 47 46 67 481 396 1330 14 6 .23 30 136 10 1.4 72 24 7.6 23 12 1.6 31 58 24 3.8 45 13 1.9 --- --- --- TOTAL 828 95.96 2006 3143.60 826 445.04 RIO FAJARDO BASIN 50072500 RIO FAJARDO BELOW FAJARDO, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°19'35", long 65°38'47m, 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 sq mi (60.6 sq km). PERIOD OF RECORD.--Water years 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR 1NSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1985 30... 1130 91 150 6.70 26.5 1900 15 5700 5700 DEC 03... 1620 45 180 7.80 26.5 4.5 <10 26000 4500 FEB 1986 11... 1545 26 184 7.80 26.5 2.3 6.0 35 K20000 4200 MAY 06... 1230 154 155 7.00 26.5 330 6.6 83 50 K80000 80000 JUL 02... 1425 24 172 7.70 31.0 3.0 8.7 117 <10 K120 K80 SEP 02... 1410 77 136 7.25 28.0 17 8.0 103 <10 26000 8500 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- HARD- NONCARB CALCIUM SIUM, SODIUM, AD- SIUM, WATER SULFATE RIDE, NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG)• AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1985 30... 38 3 8.5 4.0 10 0.7 1.8 35 <0.5 8.2 16 DEC 03... 48 FEB 1986 11... 44 MAY 06... 34 0 8.2 3.4 11 0.8 2.3 35 <O.5 9.6 18 JUL 02... 39 SEP 02... 35 2 8.7 3.3 12 0.9 1.6 33 10 12 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1985 30... 0.10 21 91 22 16 0.360 0.040 0.400 0.130 0.57 DEC 03... 1 <0.010 0.100 0.140 0.16 FEB 1986 11... 1 MAY 06... <0.10 17 90 38 412 0.440 0.060 0.500 0.130 0.77 JUL 02... 22 <0.010 <0.100 0.060 0.24 SEP 02... 0.10 18 85 18 14 0.190 0.010 0.200 0.150 0.35 K = non-ideal count 209 RIO FAJARDO BASIN 50072500 RIO FAJARDO BELOW FAJARDO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMiJM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS. N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1985 30... 0.70 1.1 4.9 0.130 <1 100 50 <1 11 30 DEC 03... 0.30 0.40 1.8 0.040 FEB 1986 11... -- MAY 06... 0.90 1.4 6.2 0.110 1 100 30 <1 5 30 JUL 02... 0.30 0.030 SEP 2... 0.50 0.70 3.1 0.060 MANGA- METHY- IRON, LEAD, NESE. MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1985 30... 7600 1 300 0.20 <1 <1 40 <0.010 <1 0.04 DEC 3... FEB 1986 11... -- MAY 06... 10000 4 350 <0.10 1 <1 40 <0.010 <1 0.10 JUL 02... SEP 02... 210 211 RIO BLANCO BASIN 50075000 RIO ICACOS NEAR NAGUABO, PR LOCATION.--Lat 18°16'38", long 65°47'09", Hydrologic Unit 21010001, in Caribbean National Forest, off Highway 191, at El Yunque, 1.6 mi (2.6 km) upstream from confluence with Rio Cubuy, 2.8 mi (4.5 km) north of Florida, and 5.3 mi (8.5 km) northwest of Naguabo Plaza. DRAINAGE AREA.--1.26 mi' (3.26 ka2). 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 man. REMARKS.--No estimated daily discharges during water year. Records poor. AVERAGE DISCHARGE.--14 years (1946-52, 1980-86), 15.1 ft'is (0.428 e/s), 162.74 in/yr (4,134 mm/yr), 10,940 acre-ft/yr (13.5 hm 3/yr); median of yearly mean discharges, 14 ft'/s (0.40 10/s), 10,100 acre-ft/yr (12 hmYyr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 2,860 ft3/s (81.0 m'/s), Apr. 21, 1983, gage height, 8.96 ft (2.731 m), from rating curve extended above 30 ft'is (0.850 m'/s) on basis of step-backwater analysis; minimum daily discharge, 1.5 ft3/s (0.042 m'/s), Mar. 22, Apr. 10, 1946. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 650 ft'is (18.4 03/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft3/s) (m 3/s) (ft) (m) Date Time (ft3/s) (m 3/s) (ft) (m) Oct. 24 0630 756 21.4 5.60 1.707 May 13 0845 *859 24.3 *5.86 1.786 Apr. 5 1445 827 23.4 5.78 1.762 Minimum discharge, 3.9 ft3/s (0.110 e/s), Apr. 27. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 13 16 13 10 6.5 4.8 7.6 31 8.6 6.5 7.9 24 2 37 20 13 10 10 4.8 6.9 11 7.0 6.4 6.6 8.6 3 16 14 12 20 7.5 4.8 5.6 7.4 6.6 6.8 6.9 7.6 4 14 15 11 15 40 5.8 11 7.3 6.3 5.6 6.4 7.1 5 24 14 19 9.6 11 5.0 107 6.9 6.0 9.9 5.8 7.0 6 239 13 12 8.3 8.3 4.9 12 15 5.9 14 5.5 11 7 62 12 11 7.9 7.5 4.9 7.2 34 6.3 8.7 6.2 7.1 8 22 12 16 7.9 6.7 4.6 11 9.0 7.6 6.4 5.7 6.6 9 18 12 13 38 6.4 6.1 7.5 24 9.4 5.8 5.2 6.4 10 16 12 14 10 6.1 4.9 6.2 20 12 5.4 5.2 6.3 11 15 41 15 10 6.0 6.4 5.8 16 7.8 5.7 41 6.1 12 14 47 20 8.5 5.8 4.9 5.6 8.4 10 8.9 9.2 6.0 13 14 68 13 7.9 5.6 14 5.4 76 12 5.5 43 5.9 14 14 52 11 7.5 5.7 17 5.2 26 11 8.1 13 5.7 15 13 100 14 7.5 5.5 18 5.0 9.6 20 14 9.3 5.6 16 12 26 11 10 5.3 12 5.0 8.8 12 8.0 8.6 5.3 17 12 20 11 9.2 6.4 9.1 4.8 9.6 11 9.6 6.9 5.1 18 28 23 11 7.6 5.5 6.4 4.8 22 8.3 6.0 6.0 5.1 19 15 19 10 7.7 18 5.8 4.6 14 10 5.6 5.7 4.9 20 14 29 15 8.3 7.1 5.5 4.5 9.1 8.6 5.4 5.5 4.9 21 14 41 12 9.3 5.8 5.2 4.6 8.9 8.8 5.3 5.4 5.0 22 23 17 17 8.3 5.5 5.2 4.5 8.2 7.6 5.1 7.2 5.3 23 75 20 12 9.8 5.3 4.9 4.5 7.7 7.3 4.9 31 6.3 24 129 17 11 12 5.2 5.0 4.4 7.8 7.0 6.8 64 5.1 25 21 16 11 7.8 5.2 5.2 4.2 7.4 6.8 5.0 11 5.6 26 31 15 11 7.0 5.1 7.5 4.2 8.4 7.9 4.7 7.6 6.9 27 18 14 9.5 6.7 5.0 5.7 6.2 9.9 11 5.0 6.9 6.9 28 16 13 12 6.4 5.0 16 14 8.7 7.2 5.7 69 6.1 29 24 13 9.3 6.4 --- 16 50 15 6.8 80 52 5.3 30 15 16 8.5 7.1 7.2 56 7.5 6.5 78 9.9 12 31 16 --- 8.2 7.7 11 --- 56 --- 11 8.5 --- TOTAL 994 747 386.5 309.4 223.0 238.6 385.3 510.6 263.3 363.8 482.1 210.8 MEAN 32.1 24.9 12.5 9.98 7.96 7.70 12.8 16.5 8.78 11.7 15.6 7.03 MAX 239 100 20 38 40 18 107 76 20 80 69 24 MIN 12 12 8.2 6.4 5.0 4.6 4.2 6.9 5.9 4.7 5.2 4.9 CFSM 25.5 19.8 9.92 7.92 6.32 6.11 10.2 13.1 6.97 9.29 12.4 5.58 IN. 29.35 22.05 11.41 9.13 6.58 7.04 11.38 15.07 7.77 10.74 14.23 6.22 AC-FT 1970 1480 767 614 442 473 764 1010 522 722 956 418 CAL YR 1985 TOTAL 5343.6 MEAN 14.6 MAX 239 MIN 3.7 CFSM 11.6 IN. 157.76 AC-FT 10600 WTR YR 1986 TOTAL 5114.4 MEAN 14.0 MAX 239 MIN 4.2 CFSM 11.1 IN. 151.00 AC-FT 10140 212 RIO BLANCO BASIN 50075000 RIO ICACOS NEAR KAGUABO, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS AUGUST 1981 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAM1LOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) MAY, 15 1034 9.8 56 20.5 AUG, 18 1034 6.2 69 21.0 JUN, 19 0948 8.3 60 20.5 SEP, 10 1006 6.4 69 21.0 JUL, 16 1031 6.5 68 21.0 Rib Anton R131; basin HUMACAO AMU', •ARECiliO .idAYX1WE Z R,b Grande de LoiOO basin Rib de la Pinto basin Island vide 096 64?fro, •0865 Drainage boundary 20 Lopa Rib Salinas (Aligval basin Path/as G UAYA A 18 EXPLANATION ARROYO E920 SURFACE—WATER STATION AND NUMBER -0835 QUALITY—OF—WATER STATION AND NUMBER CARIBBEAN S E A • 31 WELL AND WELL NUMBER 5 KILOMETERS Figure 23.--Rio Guanajibo basin. 214 RIO HUMACAO BASIN 50082000 RIO HUMACAO AT HIGHWAY 3 AT HUMACAO, PR WATER-QUALITY RECORDS PERIOD OF RECORD.--Water years 1958-66, 1969 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLT- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1985 17... 1645 73 157 7.50 28.0 64 7.6 20 43000 25000 DEC 19... 1055 31 264 7.80 27.0 10 8.0 20 K110000 39000 FEB 1986 19... 1320 20 289 7.20 30.5 2.7 6.0 34 270000 K200000 APR 22... 0935 8.9 332 7.60 28.0 1.8 7.7 99 29 530000 110000 JUL 16... 1125 23 264 7.50 29.5 15 8.0 106 26 200000 7400 SEP 19... 0950 14 294 7.55 28.0 7.1 7.9 102 40 K11000 2200 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- HARD- NONCARB CALCIUM SLUM, SODIUM, AD- SIUM, WATER SULFATE RIDE, NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1985 17... 53 0 14 4.4 16 1 2.5 53 <0.5 11 17 DEC 19... 69 FEB 1986 19... 76 APR 22... 100 5 28 7.5 30 1 2.5 96 <0.5 14 37 JUL 16... 79 SEP 19... 82 0 22 6.5 25 1 2.0 85 14 31 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE N020403 AMMONIA ORGANIC SOLVED (MG/L D1S- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) S102) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1985 17... 0.10 31 130 25 84 0.760 0.040 0.800 0.250 0.85 DEC 19... 3 0.870 0.030 0.900 0.730 0.47 FEB 1986 19... 11 0.930 0.070 1.00 0.620 0.48 APR 22... 0.20 38 210 5.2 1 0.760 0.040 0.800 1.30 0.40 JUL 16... 20 0.680 0.020 0.700 0.310 0.29 SEP 19... 0.10 40 190 7.0 7 0.980 0.020 1.00 0.250 0.15 K = non-ideal count 215 RIO HUMACAO BASIN 50082000 RIO HUMACAO AT HIGHWAY 3 AT HUMACAO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1985 17... 1.1 1.9 8.4 0.210 <1 100 20 3 6 10 DEC 19,.. 1.2 2.1 9.3 0.320 FEB 1986 19... 1.1 2.1 9.3 0.450 APR 22... 1.7 2.5 11 0.490 <1 100 60 <1 13 <10 JUL 16... 0.60 1.3 5.8 0.280 SEP 19... 0.40 1.4 6.2 0.270 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- • RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1985 17... 4800 3 270 <0.10 <1 <1 50 <0.010 3 0.09 DEC 19... -- FEB 1986 19... -­ APR 22... 320 1 160 0.10 <1 <1 20 <0.010 4 0.15 JUL 16... SEP 19... I RIO GUAYANES BASIN 50083500 RIO GUAYANES AT YABUCOA, PR WATER-QUALITY RECORDS LOCATION.--Lat 18'03'331, long 65'54'03", at hridge on Highway 182, 1.4 i (2,2 km) west-northwest of Yabucoa plaza. DRAINAGE AREA.--17.2 sq mi (44.6 sq km). PERIOD OF RECORD.--Water years 1958-62, 1968-70, 1980 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEM3ER 1986 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1985 18... 1145 84 132 7.80 26.0 66 19 K32000 6700 DEC 18... 1045 37 170 7.50 23.5 8.4 K12000 4600 FEB 1986 20... 1030 64 110 7.30 21.5 140 10.0 57 4800 2500 APR 25... 1050 19 166 7.40 25.0 5.0 8.4 102 20 560 450 JUL 22... 1215 28 155 7.35 28.0 10 8.1 104 13 K1500 680 SEP 22... 1325 34 156 7.50 27.5 10 8.0 102 <10 2000 2700 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- HARD- NONCARB CALCIUM SLUM, SODIUM, AD- SIUM, WATER SULFATE RIDE, NESS WATER DIS- DIS- DIS- SORP-. DIS- TOTAL SULFIDE DIS- OIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1985 18... 37 0 9.3 3.4 12 0.9 1.3 44 <0.5 8.6 11 DEC 18... 51 FEB 1986 20... 27 APR 25... 48 0 12 4.5 15 1 1.3 59 <0.5 5.7 10 JUL 22... 57 SEP 22... 44 0 11 4.0 14 0.9 1.4 57 6.1 11 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, CEN, GEM, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS PO AS N) AS N) AS N) OCT 1985 18... 0.10 32 100 24 90 0.380 0.020 0.400 0.070 0.23 DEC 18... <0.010 0.500 0.020 0.18 FEB 1986 20... 192 0.460 0.040 0.500 0.070 0.83 APR 25... 0.10 38 120 6.4 2 <0.010 0.200 0.030 0.27 JUL 22... 14 <0.010 0.200 0.050 0.55 SEP 22... 0.20 36 120 11 18 <0.010 0.200 0. • 060 0.24 K = non-ideal count 216 217 RIO GUAYANES BASIN 50083500 RIO GUAYANES AT YABUCOA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1985 18... 0.30 0.70 3.1 0.090 <1 <100 20 1 4 10 DEC 18... 0.20 0.70 3.1 0.040 FEB 1986 20... 0.90 1.4 6.2 0.110 -- APR 25... 0.30 0.50 2.2 0.030 <1 100 10 <1 5 <10 JUL 22... 0.60 0.80 3.5 0.050 -- SEP 22... 0.30 0.50 2.2 0.060 MANGA- NETHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1985 18... 5300 2 150 0.10 <1 <1 40 <0.010 2 0.05 DEC 18... FEB 1986 20... -- APR 25... 850 1 100 <0.10 <1 <1 <10 <0.010 <1 0.02 JUL 22... -- SEP 22... -- PESTICIDE ANALYSES CHLOR- DI- DI- PCB, ALDRIN, DANE, ODD, DOE, DDT, AZINON, ELDRIN DATE TIME DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUL 1986 22... 1215 <0.1 <0.01 <0.1 <0.01 <0.01 <0.01 <0.01 <0.01 HEPTA- METH- ENDO- HEPTA- CHLOR MALA- OXY- SULFAN, ENDRIN, ETHION, CHLOR, EPDXIDE LINDANE THION, CHLOR, DATE DIS- DIS- DIS- DIS- DIS- D1S- DIS- DIS- SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUL 1936 22... <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 NAPH- THA- METHYL METHYL LENES, PARA- TRI- PARA- POLY- PER- TOX- DIS- THION, THION, MIREX, THION, CHLOR. THANE APHENE, SOLVE DATE DIS- DIS- DIS- DIS- DIS- DIS- DIS- TRI- SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED THION (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUL 1986 22... <0.01 <0.01 <0.01 <0.01 <0.1 <0.1 <10 <0.01 RIO GUAYANES BASIN 50086500 RIO GUAYANES ABOVE MOUTH AT PLAYA DE GUAYANES, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°03'45", long 65°49'42", at Dld 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 sq mi (88.1 sq km). PERIOD OF RECORD.--Water years 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1985 31... 1250 402 132 7.10 28.0 120 8.8 33 3400 3900 DEC 18... 1430 88 182 7.70 26.0 13 7.2 <10 K460 K430 FEB 1986 20... 1300 100 285 7.60 27.5 21 10.0 49 4400 2800 MAY 08... 1130 77 162 7.60 27.5 18 7.9 101 23 3700 2600 JUL 22... 0955 57 201 7.55 27.5 22 7.4 94 14 K790 530 SEP 22... 1055 46 197 7.65 27.0 11 8.7 110 29 6000 4900 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- HARD- NONCARB CALCIUM SIUK, SODIUM, AD- SLUM, WATER SULFATE RIDE, NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1985 31... 56 18 16 4.0 10 0.6 2.4 38 <0.5 9.9 11 DEC 18... 49 FEB 1986 20... 79 MAY 08... 37 0 9.5 3.3 13 1 3.1 43 <0.5 9.2 12 JUL 22... 66 SEP 22... 49 0 12 4,6 18 1 1.8 66 10 15 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1985 31... <0.10 25 100 110 276 0.340 0.060 0.400 0.120 0.98 DEC 18... 14 <0.010 0.500 0.020 0.28 FEB 1986 20... 50 0.560 0.040 0.600 0.120 0.58 MAY 08... <0.10 28 100 22 44 0.290 0.010 0.300 0.070 0.53 JUL 22... 26 <0.010 0.400 0.030 0.27 SEP 22... 0.20 35 140 17 13 <0.010 0.200 0.050 0.15 K = non-ideal count 218 -- 219 RIO GUAYANES BASIN 50086500 RIO GUAYANES ABOVE MOUTH AT PLAYA DE GUAYANES, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1985 31... 1.1 1.5 6.6 0.180 <1 100 50 <1 14 30 DEC 18... 0.30 0.80 3.5 0.050 FEB 1986 20... 0.70 1.3 5.8 0.160 MAY 08... 0.60 0.90 4.0 0.170 <1 100 50 <1 3 10 JUL 22... 0.30 0.70 3.1 0.070 SEP 22... 0.20 0.40 1.8 0.070 -- MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1985 31... 13000 2 500 <0.10 <1 <1 30 <0.010 2 0.06 DEC 18... FEB 1986 20... MAY 08... 3500 <1 220 <0.10 <1 <1 30 <0.010 <1 0.06 JUL 22... SEP 22... 220 RIO MAUNABO BASIN 50091000 RIO MAUNABO AT MAUNABO, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°00'24", long 65°54 1 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 sq mi (32.1 sq km). PERIOD OF RECORD.--Water years 1958-66, 1975 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1985 17... 1210 41 216 7.90 28.0 14 7.6 19 3500 1900 DEC 17... 1430 19 240 7.80 28.0 3.4 7.6 98 <10 K1200 520 FEB 1986 19... 1030 17 240 7.40 26.5 3.4 6.8 26 2000 1500 MAY 07... 0955 55 156 7.40 23.5 42 7.8 93 31 4300 45000 JUL 23... 1310 19 207 7.50 30.0 4.2 7.6 101 25 21000 470 SEP 23... 1205 16 230 7.65 30.0 16 8.0 10­r 20 35000 6000 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- HARD- NONCARB CALCIUM S1UM, SODIUM, AD- SLUM, WATER SULFATE RIDE, NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L TOT FLU SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1985 17... 63 0 15 6.1 17 1 1.1 67 <0.5 11 16 DEC 17... 72 FEB 1986 19... 74 MAY 07... 41 9 9.7 4.1 11 0.8 2.1 32 <0.5 10 25 JUL 23... 74 SEP 23... 60 0 14 6.2 18 1 1.5 72 8.5 15 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO20403 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1985 17... 0.10 38 140 16 31 0.490 0.010 0.500 0.040 0.36 DEC 17... 5 <0.010 0.400 0.020 0.28 FEB 1986 19... 13 <0.010 0.200 0.030 0.17 MAY 07... <0.10 23 100 16 60 0.780 0.020 0.800 0.150 0.75 JUL 23... 34 <0.010 0.200 0.020 0.38 SEP 23... 0.20 35 140 6.0 50 <0.010 0.100 0.080 0.22 K = non-ideal count RIO MAUNABO BASIN 50091000 RIO MAUNABO AT MAUNABO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 NITRO- CHRO- GLN,AM- BARIUM, BORON, CADMIUM M1UM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1985 17... 0.40 0.90 4.0 0.060 <1 <100 40 1 5 10 DEC 17... 0.30 0.70 3.1 0.040 FEB 1986 19... 0.20 0.40 1.8 0.040 KAY 07... 0.90 1.7 7.5 0.120 <1 100 50 <1 2 10 JUL 23... 0.40 0.60 2.7 0.050 SEP 23... 0.30 0.40 1.8 0.100 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1985 17... 1500 <1 80 <0.10 <1 <1 20 <0.010 7 0.05 DEC 17... -- FEB 1986 19... -- MAY 07... 3100 <1 100 <0.10 <1 <1 30 <0.010 <1 0.05 JUL 23... -- SEP 23... 221 RIO CHICO BASIN 50091800 RIO CHICO AT PROVIDENCIA, PR WATER-QUALITY RECORDS LOCATION.--Lat 17°59'16", long 66°00'18", at flat low bridge 200 ft (61 m) south of Highway 3, 0.5 mi (0.8 km) above mouth, and 1.5 mi (2.4 km) southeast of Patillas plaza. DRAINAGE AREA.--4.9 sq mi (12.8 sq km). PERIOD OF RECORD.--Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATLIRE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1985 31... 1700 40 282 6.90 28.0 18 8.0 104 19 K2000 4900 DEC 17... 1230 2.5 624 7.40 27.0 1.5 0.8 87 K140000 20000 FEB 1986 13... 1600 0.66 921 7.40 28.0 15 0 220 290000 K100000 MAY 07... 1245 0.38 801 7.40 30.5 26 0 0 240 2000000 K110000 JUL 23... 1055 0.86 540 7.45 30.0 4.0 0 0 110 2500000 K140000 SEP 23... 0910 0.25 744 7,35 28.5 7.5 0.3 4 270 K1200000 150000 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- HARD- NONCARB CALCIUM SIUM, SODIUM, AD- SIUM, WATER SULFATE RIDE, NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1985 31... 61 0 14 6.3 21 1 1.3 85 <0.5 17 23 DEC 17... 156 FEB 1986 13... 207 MAY 07... 110 0 27 10 70 3 11 238 1.6 43 69 JUL 23... 174 SEP 23... 130 0 31 13 63 2 11 215 32 70 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1985 31... 0.10 28 160 17 36 0.390 0.010 0.400 0.270 0.43 DEC 17... 1 0.010 <0.100 5.70 2.9 FEB 1986 13... 2 0.020 <0.100 18.0 6.0 MAY 07... <0.10 29 400 0.41 14 0.020 <0.100 0.290 39 JUL 23... 16 0.010 <0.100 12.0 7.0 SEP 23... 0.20 33 380 0.26 23 0.030 <0.100 4.60 31 K = non-ideal count 222 223 RIO CHICO BASIN 50091800 RIO CHICO AT PROVIDENCIA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 DATE NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CO) AS CR) AS CU) OCT 1985 31... DEC 17... FEB 1986 13... MAY 07... JUL 23... SEP 23... 0.70 8.6 24 39 19 36 1.1 4.9 0.200 1.20 5.00 <0.010 2.50 7.60 <1 1 -- -- <100 100 30 100 1 <1 12 <1 10 40 DATE MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER. ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELF- TCTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLL ERABLE TOTAL PHENOLS SUB- (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1985 31... DEC 17... FEB 1986 13... MAY 07... JUL 23... SEP 23... 1900 640 1 2 70 110 <0.10 0.10 <1 <1 <1 <1 10 40 <0.010 0.020 1 42 0.10 5.1 I I I I 224 RIO GRANDE DE PATILLAS BASIN 50092000 RIO GRANDE DE PATILLAS NEAR PATILLAS, PR LOCATION.--Lat 18°02'04", long 66°01'58", Hydrologic Unit 21010004, on left bank, at foot bridge, off Highway 184, 1.2 mi (1.9 km) upstream fro Lago Patillas Dam and 2.2 i (3.5 km) northwest of Patillas. DRAINAGE AREA.--18.3 mi' (47.4 km'). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--February 1959 to October 1965 (annual low-flow and occasional measurements only), January 1966 to current year. GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 235 ft (72 ), from topographic map. REMARKS.--Estimated daily discharges: Oct. 27 to Nov. 18. Records fair except those for estimated daily discharges, which are poor. AVERAGE DISCHARGE.--20 years (1967-86), 60.7 ft'/s (1.719 m'/s), 45.04 in/yr (1,144 mm/yr•), 43,980 acre-ft/yr (54.2 hm'/yr); median of yearly mean discharges, 61 ftl/s (1.73 m'/s), 44,200 acre-ft/yr (54 he/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 14,800 ft'/s (419 '/s), Sept. 16, 1975, gage height, 12.45 ft (3.795 m), from rating curve extended above 250 ft'/s (7.08 m'/s) on basis of slope-area measurement of peak flow; minimum discharge, 4.6 ft'/s (0.130 m'/s), May 13-16, 1968. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 2,500 ft'/s (70.8 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (10/s) (ft) (m) Date Time (ft'/s) 00/s) (ft) (m) Oct. 6 1145 *8,440 239 *12.49 3.807 May 13 0845 3,490 98.8 9.37 2.856 Oct. 26 1715 4,130 117 9.87 3.008 May 18 1200 2,620 74.2 8.59 2.618 Minimum discharge, 6.2 ft'/s (0.176 m'/s), Apr. 26, 27. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 2 3 4 5 63 60 88 83 179 120 80 200 135 120 44 43 41 41 47 29 32 37 45 34 24 23 33 43 46 14 13 12 15 15 35 23 16 119 55 41 18 12 9.5 8.7 52 43 43 39 40 30 26 25 23 22 18 16 15 19 17 48 40 32 28 29 6 7 8 9 10 2570 1570 629 245 158 100 90 80 75 70 50 48 41 40 40 28 26 26 49 49 28 23 21 21 20 13 13 11 11 11 49 24 20 24 18 36 42 19 25 251 38 33 35 134 222 30 30 22 20 17 14 25 44 18 16 28 26 22 21 20 11 12 13 14 15 117 93 76 65 57 65 85 165 170 900 40 64 49 39 36 33 29 27 26 26 20 20 20 18 18 12 12 14 23 35 16 14 13 12 12 217 75 455 257 102 72 55 59 71 52 31 38 22 22 34 55 34 57 46 22 19 19 19 20 19 16 17 18 19 20 52 64 75 62 46 230 170 100 81 73 35 34 35 38 42 26 33 35 29 27 17 24 26 43 38 18 13 11 9.9 9.3 11 11 11 11 13 65 60 443 162 99 60 49 43 41 41 28 23 21 17 15 17 16 15 14 14 17 15 11 11 11 21 22 23 24 25 45 44 221 262 204 68 59 56 53 50 35 34 32 46 44 28 26 25 93 50 26 21 17 15 15 8.3 7.8 7.8 7.8 7.1 12 9.4 9.0 8.4 8.0 81 77 58 48 43 37 33 31 30 30 19 16 14 12 12 13 12 13 15 13 11 17 26 90 111 26 27 28 29 30 31 553 280 110 280 250 270 49 47 46 44 47 --- 41 33 34 31 32 29 36 30 29 28 29 26 15 14 14 --- 9.4 18 18 216 45 36 7.0 7.2 10 213 75 --- 40 38 37 44 39 161 30 36 32 27 24 --- 11 9 8 14 16 28 22 11 11 111 573 101 58 67 33 26. 22 20 --- TOTAL MEAN MAX MIN CFSM IN. AC-FT 8871 286 2570 44 15.6 18.03 17600 3628 121 900 44 6.61 7.37 7200 1238 39.9 64 29 2.18 2.52 2460 1046 33.7 93 25 1.84 2.13 2070 663 23.7 46 14 1.30 1.35 1320 666.4 21.5 216 7.1 1.17 1.35 1320 866.0 28.9 213 7.0 1.58 1.76 1720 3063.2 98.8 455 8.7 5.40 6.23 6080 1532 51.1 222 24 2.79 3.11 3040 669.8 21.6 38 9.•3 1.18 1.36 1330 1423 45.9 573 11 2.51 2.89 2820 878 29.3 111 11 1.60 1.78 1740 CAL YR 1985 WTR YR 1986 TOTAL TOTAL 25899.5 24544.4 MEAN MEAN 71.0 67.2 MAX MAX 2570 2570 MIN MIN 8.3 7.0 CFSM CFSM 3.88 3.67 IN. IN. 52.65 49.89 AC-FT AC-FT 51370 48680 225 RIO GRANDE DE PATILLAS BASIN 50092000 RIO GRANDE DE PATILLAS NEAR PATILLAS, PR--Continued (National stream-quality accounting network station) WATER-QUALITY RECORDS PERIOD OF RECORD.--Water years 1960 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 OXYGEN, COLI- STREP- SPE- DIS- FORM, TOCOCCI STREAM- CIFIC SOLVED FECAL, FECAL, HARD- FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- 0.7 KF AGAR NESS INSTAN- DUCT- (STAND- ATURE BID- D1S- CENT UM-MF (COLS. (MG/L DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED SATUR- (COLS./ PER AS (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) 100 ML) 100 ML) CAC03) OCT 1985 21... 1530 58 173 8.20 27.0 16 8.6 108 K5600 K5500 49 JAN 1986 13... 1500 27 156 8.30 27.0 1.0 7.6 96 >1200 K39 49 APR 07... 1410 24 138 8.10 27.0 8.0 102 300 530 JUL 01... 1220 33 154 8.00 27.5 1.8 8.3 106 380 300 48 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- FLUO- SILICA, NONCARB CALCIUM SIUM, SODIUM, AD- SIUM, WATER SULFATE RIDE, RIDE, DIS- WATER DIS- DIS- DIS- SORP- DIS- TOTAL DIS- DIS- DIS- SOLVED TOT FLD .SOLVED SOLVED SOLVED TION SOLVED FIELD SOLVED SOLVED SOLVED. (MG/L • DATE MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L AS CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS SO4) AS CL) AS F) SI02) . OCT 1985 21... 1 11 5.1 14 0.9 0.70 48 8.2 12 <0.10 26 JAN 1986 13... 0 11 5.1 13 0.8 0.40 56 11 11 0.10 23 APR 07... 40 JUL 01... 0 11 4.9 14 0.9 0.60 74 11 9.7 0.20 24 SOLIDS, SOLIDS, NITRO- NITRO- NITRO-. NITRO- PHOS- PHOS- RESIDUE SUM OF SOLIDS, GEN, GEN, GEN; GEN,AM- PHOS- PHORUS, PHATE, AT 180 CONSTI- DIS- NO214403 AMMONIA AMMONIA MONIA + PHOS- PHORUS, ORTHO, ORTHO, DEG% C TUENTS, SOLVED DIS- DIS- DIS- ORGANIC PHORUS, DIS- DIS- DIS- DIS- DIS- (TONS SOLVED SOLVED SOLVED TOTAL TOTAL SOLVED SOLVED SOLVED DATE SOLVED SOLVED PER (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L) (MG/L) DAY) AS N) AS N) AS NH4) AS N) AS P) AS P) AS P) AS PO4) OCT 1985 21... 101 110 16 0.140 0.120 0.15 0.30 0.020 <0.010 <0.010 JAN 1986 13... 103 110 7.5 0.30 0.030 0.010 -- APR 07... 0.100 0.030 0.04 0.30 0.020 0.030 0.010 0.03 JUL 01... '105 120 9.3 <0.100 <0.010 0.30 0.020 0.020 0.020 0.06 ALUM- BERYL- CHRO- INUM, ARSENIC BARIUM, .LIUM, CADMIUM MIUM, COBALT, COPPER, IRON, LEAD, DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- SOLVED SCLVED SOLVED SOLVED - SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS AL) AS AS) AS BA) AS BE) AS CD) AS CR) AS CO) AS CU) AS FE) AS PB) OCT 1985 21... 40 1 17 <0.5 <1 <1 <3 <1 41 <1 JAN 1986 13... 10 <1 16 <0.5 <1 <1 <3 1 18 <1 APR 07... JUL 01... 20 <1 11 <0.5 <1 <1 <3 1 18 <5 K = non-ideal count 226 RIO GRANDE DE PATILLAS BASIN 50092000 RIO GRANDE DE PATILLAS NEAR PATILLAS, PR--Continued (National stream-quality accounting network station) WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MANGA- MOLYB- SELE- STRON- VANA- LITHIUM NESE, MERCURY DENUM, NICKEL, NIUM, SILVER, TIUM, DIUM, ZINC, DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS LI) AS MN) AS HG) AS MO) AS NI) AS SE) AS AG) AS SR) AS V) AS ZN) OCT 1985 21... <4 18 0.2 <10 <1 <1 <1 39 <6 7 JAN 1986 13... <4 7 <0.1 <10 <1 <1 <1 39 <6 4 APR 07... JUL 01... <4 5 <0.1 <10 <1 <1 <1 38 <6 7 PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT SED. SEDI- SUSP. MENT, SIEVE STREAM- SEDI- DIS- DIAM. FLOW, MENT, CHARGE, PERCENT 1NSTAN- SUS- SUS- FINER DATE TIME TANEOUS PENDED PENDED THAN (CFS) (MG/L) (T/DAY) .062 MM OCT 1985 21... 1505 88 43 10 79 JAN 1986 13... 1530 24 26 1.7 90 APR 07... 1400 25 21 _1.4 95 JUL 01... 1210 29 25 2.0 98 I VIL ALBA 'o Rio Grande de &twat,' basin AIRONITO Rio de to Plata boci EXPLANATION SURFACE-WATER STATION AND NUMBER QUALITY-OF--WATER STATION AND NUMBER WELL AND WELL NUMBER ego ea Vaca •90 Gooyabal Drainage boundary Drainage boundary, UAN DIAZ Rio Gooman3" weir Cocuno Rio Seco basin GUAYANIA SANTA ISABEL 8 rix de Jobos •MAYASUEZ GACWAS. AUAYAMAC. 5 KILOMETERS M ap area 1 5 MILES Figure 21.--South coast river basins--Rio Salinas to Rio Jacaguas basins. 228 RIO COAMO BASIN 50106500 RIO COAMO NEAR COAMO, PR WATER-QUALITY RECORDS PERIOD OF RECORD.--Water years 1978 to current year. WATER-QUALITY RECORDS, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1985 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE BID- 01S- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) NOV 1985 02... 1240 143 677 8.00 28.0 44 8.4 109 10 4800 1700 DEC 2... 1500 65 682 8.20 28.0 12 9.2 120 10 K13000 870 FEB 1986 25... 1130 15 715 7.90 26.0 2.4 8.4 104 25 APR 29... 1220 15 675 8.20 30.0 2.3 8.0 108 50 K71000 8800 JUL 07... 1200 21 609 8.15 31.5 2.0 9.1 125 21 370 K140 SEP 3... 1240 17 571 8.00 33.0 3.0 6.2 88 <10 K6500 520 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- HARD- NONCARB CALCIUM SIUM, SODIUM, AD- SIUM, WATER SULFATE RIDE, NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) NOV 1985 02... 240 26 66 19 28 0.8 2.8 217 <0.5 30 38 DEC 02... 217 FEB 1986 25... 236 APR 29... 240 0 65 20 38 1 3.3 245 <0.5 33 47 JUL 07... 232 SEP 03.,. 240 22 63 19 35 1 3.3 214 34 36 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) NOV 1985 02... 0.20 31 350 133 87 3.38 0.020 3.40 0.160 0.54 DEC 2... 24 4.06 0.040 4.10 0.330 0.67 FEB 1986 25... 12 3.19 0.210 3.40 0.660 0.74 APR 29... 0.20 27 380 15 32 1.58 0.120 1.70 1.60 0.80 JUL 07... 5 2.27 0.130 2.40 0,360 0.54 SEP 3... 0.20 32 350 16 4 2.08 0.120 2.20 0.800 0.60 K = non-ideal count 229 RIO COAMO BASIN 50106500 RIO COAMO NEAR COAMO, PR--Continued WATER-QUALITY RECORDS, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) NOV 1985 02... 0.70 4.1 18 0.270 1 100 30 <1 13 20 DEC 2... 1.0 5.1 23 0.310 FEB 1986 25... 1.4 4.8 21 0.760 APR 29... 2.4 4.1 18 0.730 1 <100 60 <1 5 10 JUL 07... 0.90 3.3 15 0.460 -- SEP 3... 1.4 3.6 16 0.630 -- MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL 'TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) NOV 1985 02... 4900 2 140 0.10 <1 <1 40 <0.010 <1 0.05 DEC 2... FEB 1986 25... -- APR 29... 360 1 110 <0.10 <1 <1 30 <0.010 3 0.25 JUL 07... -- SEP 3... I I I I I I 230 RIO DESCALABRADO BASIN 50108000 RIO DESCALABRADO NEAR LOS LLANOS, PR LOCATION.--Lat 18°03'08", long 66°25'34", Hydrologic Unit 21010004, at bridge on Highway 14, 1.5 •i (2.4 km) west of Los Llanos, and 5.3 mi (8.5 km) east of Juana Diaz. DRAINAGE AREA.--12.9 i2 (33.4 km2 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--1959-65 (annual low-flow measurements only), 1965 (annual maximum discharge), January 1966 to June 1969, July to December 1969 (maximum discharge only), February 1984 to current year. GAGE.--Water-stage recorder. Elevation of gage is 220 ft (67 m), from topographic map. REMARKS.--Estimated daily discharges: Oct. 1-24, Dec. 13 to Jan. 9. Records fair except those for estimated daily discharges, which are poor. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 30,000 ft'is (850 m'/s), Oct. 7, 1985, gage height, 24.37 ft (7.43 ), fro rating curve extended above 10,000 ft'/s (283 m'/s) on basis of step-backwater analysis; no flow any days. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,500 ft'is (42.5 '/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (W/s) (m3 /s) (ft) (m) Date Time (W/s) (10/s) (ft) (m) Oct. 7 unknown *30,000 850 *24.37 7.428 May 13 0645 7,900 224 14.56 4.448 Minimum daily discharge, 0.90 ft'/s (0.025 '/s), Aug. 21-23. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 2 3 4 5 5.7 5.6 5.4 5.0 6.0 23 21 27 15 13 7.8 7.5 8.8 9.4 9.1 6.2 6.4 6.0 6.2 6.0 4.7 4.6 5.0 5.2 4.7 2.1 2.3 2.3 2.3 2.3 1.8 1.8 2.1 6.3 3.7 2.7 1.8 2.7 1.7 1.4 13 11 11 11 10 4.7 4.6 4.4 4.3 4.3 2.5 2.3 2.1 1.9 1.8 3.5 2.5 2.2 2.1 1.8 6 7 8 9 10 200 2600 300 30 22 64 32 26 21 20 8.6 8.3 11 12 10 6.2 6.4 6.2 7.0 6.5 4.2 4.0 3.6 3.4 3.2 2.3 2.2 2.2 2.1 2.2 2.6 2.4 2.6 3.7 2.5 1.4 2.3 3.0 1.9 16 9.7 9.4 9.1 8.9 9.3 4.3 4.5 4.3 4.3 4.0 1.7 2.0 4.5 2.2 2.0 1.6 1.6 1.6 1.5 1.5 11 12 13 14 15 18 16 15 20 13 19 17 16 15 15 10 10 9.8 9.4 9.0 6.1 6.3 6.2 6.0 6.2 3.1 3.1 2.9 2.6 2.9 2.1 2.1 1.9 2.0 1.9 2.2 2.0 1.9 1.9 1.9 32 2.9 686 74 26 8.1 7.7 7.6 7.3 7.0 3.9 3.& 3.4 3.6 4.2 1.9 1.6 1.4 1.8 1.7 1.4 1.6 1.7 1.6 1.6 16 17 18 19 20 10 9.0 8.4 8.0 7.4 13 13 14 11 10 8.8 8.4 8.2 8.4 8.6 6.2 6.6 6.7 6.2 6.3 2.8 3.0 3.1 2.8 3.7 1.9 1.8 2.0 2.4 2.2 3.2 5.1 2.3 1.9 1.8 16 17 14 9.4 7.7 7.0 6.6 6.4 6.4 6.0 3.8 3.? 3.0 2.8 2.3 1.4 1.3 1.3 1.3 1.2 1.5 1.5 1.5 1.4 1.5 21 22 23 24 25 8.0 7.0 10 12 10 10 9.2 9.5 9.6 9.2 9.0 8.8 8.6 8.6 8.0 6.1 5.8 5.7 5.7 7.6 3.3 3.0 2.4 2.2 2.0 2.2 1.9 1.7 1.6 1.6 1.7 1.7 1.7 1.6 1.7 7.0 6.1 5.2 4.4 3.8 5.8 5.6 5.4 5.2 5.2 2.8 2.6 2.5 2.9 3.8 1.1 1.1 4.5 1.4 1.1 1.5 1.5 1.5 2.1 2.3 26 27 28 29 30 31 12 5.6 15 38 95 25 8.8 8.0 7.8 7.9 8.0 --- 7.4 6.8 6.3 6.2 6.0 6.0 8.0 6.2 6.8 5.9 9.2 6.3 3.0 2.1 2.1 --- 1.6 1.5 1.6 1.6 1.5 1.6 1.7 1.7 2.4 78 5.8 --- 2.9 2.2 1.7 19 8.3 77 5.1 5.1 5.0 4.7 4.7 --- 3.0 2.8 2.7 2.6 2.7 2.9 1.2 1.1 1.8 21 2.0 3.1 2.0 2.2 2.7 2.1 1.4 --- TOTAL MEAN MAX MIN CFSM IN. AC-FT 3542.1 114 2600 5.0 8.84 10.21 7030 493.0 16.4 64 7.8 1.27 1.42 978 264.8 8.54 12 6.0 .66 .76 525 199.2 6.43 9.2 5.7 .50 .57 395 92.7 3.31 5.2 2.0 .26 .27 184 61.0 1.97 2.4 1.5 .15 .18 121 151.7 5.06 78 1.6 .39 .44 301 1057.5 34.1 61d 1.4 2.64 3.05 2100 224.3 7.48 13 4.7 .58 .65 445 109.5 3.53 4.7 2.5 .27 .32 217 77.3 2.49 21 1.1 .19 .22 153 54.5 1.82 3.5 1.4 .14 .16 108 CAL YR 1985 WTR YR 1986 TOTAL TOTAL 7144.43 6327.6 MEAN MEAN 19.6 17.3 MAX MAX 2600 2600 MIN MIN .47 1.1 CFSM CFSM 1.52 1.34 IN. IN. 20.60 18.25 AC-FT AC-FT 14170 12550 I I I 231 RIO JACAGUAS BASIN 50111500 RIO JACAGUAS AT JUANA DIAZ, PR LOCATION.--Lat 18°03'16", long 66°30'40", Hydrologic Unit 21010004, on Highway 14 bridge, 0.4 mi (0.6 km) west of Juana Diaz plaza, and 4.0 mi (6.4 km) downstream from Lago Guayabal. DRAINAGE AREA.--49.8 mil (129.0 km 2). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--March 1984 to current year. GAGE.--Water-stage recorder. Elevation of gage is 131 ft (40 m), from topographic map. REMARKS.--Estimated daily discharges: Oct. 1, 2, Oct. 7-30, Jan. 24 to Feb. 2 and Feb. 9-15. Records fair except those fc- estir:Aed daily discharges, which are poor. Flow regulation from Lago Guayabal. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 40,000 ft'is (1,130 3/s), Oct. 7, 1985, gage height, 29.42 ft (8.967 ) from :sting curve extended above 500 ft'/s (14.2 10/s) on basis of step-backwater analysis and logarithmic extension; minimum daily discharge, 1.2 ft3/s (0.034 e/s), May 18, 1984. EXTREMES FOR CURRENT YEAR.--Maximum discharge, 40,000 ft'/s (1,130 m'/s), Oct. 7, gage height, 29.42 ft (8.967 ) from rating curve extended above 500 ft'is (14.2 50/s) on basis of step-backwater analysis and logarithmic extension; minimum daily discharge 1.6 ft'is (0.045 a'/s), Mar. 21. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 100 259 55 32 8.3 4.6 2.7 8.9 84 7.8 6.2 6.4 2 90 225 58 36 15 4.4 2.9 8.1 56 7.8 6.3 4.7 3 43 275 82 34 21 4.5 3.6 11 78 6.9 6.2 4.8 4 31 181 85 29 18 4.6 4.3 54 99 7.3 6.2 5.4 5 40 547 80 17 17 4.5 5.3 52 99 7.7 6.4 4.8 6 3440 215 80 19 16 4.4 5.6 56 91 8.2 6.7 3.9 7 3000 249 71 33 14 4.3 5.5 65 73 8.3 7.1 3.9 8 1000 184 48 42 13 4.2 5.7 81 78 8.3 7.2 3.7 9 500 143 51 53 13 3.7 7.4 104 114 8.6 6.5 4.5 10 250 107 64 57 12 3.6 7.2 148 97 7.4 6.4 5.0 11 240 103 60 42 10 3.3 7.0 488 105 7.6 6.6 5.0 12 210 136 53 19 7.8 2.8 7.5 131 77 7.8 6.6 4.5 13 200 125 52 18 7.4 2.8 7.8 2150 64 7.3 7.9 4.2 14 300 118 52 38 7.0 3.0 7.8 796 38 7.7 8.7 4.6 15 200 128 45 33 6.6 2.9 7.8 280 13 8.2 8.5 4.8 16 180 149 43 31 6.6 2.7 7.6 185 8.6 7.6 9.0 4.9 17 150 114 47 25 6.5 2.6 7.3 135 21 7.5 8.1 5.3 18 140 160 50 22 6.2 2.4 7.9 148 46 7.4 7.6 5.4 19 130 146 35 16 6.5 2.3 7.5 150 52 6.6 7.6 3.6 20 120 117 29 12 6.6 1.9 7.3 136 22 6.6 8.0 3.5 21 140 107 38 20 6.3 1.6 7.1 120 18 6.6 7.9 3.5 22 110 100 23 22 5.9 4.4 6.7 121 12 6.6 8.0 3.6 23 300 81 25 13 5.9 5.2 6.2 112 8.1 6.6 7.9 3.7 24 450 71 39 12 5.9 5.4 6.3 78 6.6 6.7 8.4 4.4 25 400 73 44 11 5.6 5.4 7.5 46 10 6.9 7.6 4.4 26 450 90 53 10 4.7 5,0 7.8 56 9.8 6.2 6.5 4.0 27 250 89 43 10 4.4 5.0 7.4 69 8.9 5.4 6.1 17 28 200 91 31 9.7 5.0 3.8 8.0 53 8.3 5.2 5.9 11 29 300 86 19 9.7 --- 3.6 12 177 7.7 5.3 31 7.8 30 500 83 21 9.2 3.2 9.9 149 7.6 5.8 12 7.3 31 319 --- 35 8.7 2.8 --- 131 --- 6.5 9.4 --- TOTAL 13783 4552 1511 743.3 262.2 114.9 204.6 6299.0 1412.6 220.4 254.5 159.6 MEAN 445 152 48.7 24.0 9.36 3.71 6.82 203 47.1 7.11 8.21 5.32 MAX 3440 547 85 57 21 5.4 12 2150 114 8.6 31 17 MIN 31 71 19 8.7 4.4 1.6 2.7 8.1 6.6 5.2 5.9 3.5 CFSM 8.94 3.05 .98 .48 .19 .07 .14 4.08 .95 .14 .16 .11 IN. 10.30 3.40 1.13 .56 .20 .09 .15 4.71 1.06 .16 .19 .12 AC-FT 27340 9030 3000 1470 520 228 406 12490 2800 437 505 317 MAX 3440 MIN 2.2 CFSM 2.00 IN. 27.19 AC-FT 72200 WTR YR 1986 TOTAL 29517.1 MEAN 80.9 MAX 3440 MIN 1.6 CFSM 1.62 IN. 22.05 CAL YR 1985 TOTAL 36401.7 MEAN 99.7 AC-FT 58550 Rio Grande de Arecibo basin Rio Grande de Aliasco bnsin Drainage boundary. Drainage boundary,\ R10 Guonojibo basin ABANA GRANDE 11 5 pa Na aaa Na Logo Loco JUANA DIA Z UAYANIILLA 24 Sahl'o de Guayana& Bottsb da ra Hobo° PLAYA 1297 DE 'PONCE ENSENADA GUANICA EXPLANATION CARIBBEAN SE A Al 125 SURFACE—WATER STATION AND NUMBER At 159 CREST—STAGE GAGING STATION AND NUMBER V1140 QUALITY—OF—WATER STATION AND NUMBER • 141 WELL AND WELL NUMBER 5 KILOMETERS 1 Map area 4 5 MILES 1.10718=1. Figure 22.--South coast river basins--Rio Inabon to Rio Loco basins. I I 234 RIO INABON BASIN 50112500 RIO INABON AT REAL ABAJO, PR LOCATION.--Lat 18°05'10*, long 66°33'46', Hydrologic Unit 21010004, at bridge on private road, off Highway 511 at Hacienda La Concordia, 0.4 i (0.6 km) upstream from diversion canal, 0.5 i (0.8 km) north of Real Abajo, and 6.1 mi (9.8 km) northeast of Plaza Degetau in Ponce. DRAINAGE AREA.--9.70 miz (25.12 km2). 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.-Estimated daily discharges: Nov. 4-25. Records fair except those for estimated daily discharges, which are poor. AVERAGE DISCHARGE.--20 years (1965-69, 1972-86), 19.0 ft'is (0.538 m3/s), 26.60 in/yr (676 mm/jr), 13,760 acre-ft/yr (17.0 hm 3/yr); median of yearly mean discharges, 18 ft'/s (0.51 e/s), 13,000 acre-ft/yr (16 hm3/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 19,000 ft'/s (538 0/s), Oct. 7, 1985, gage height, 25.3 ft (7.71 m), datum then in use, from floodmark, from rating curve extended above 30 ft3/s (0.850 10/s) on basis of contracted opening and flow-over-road measurements of peak flow; minimum daily discharge, 0.80 ft3/s (0.023 m 3/s), July 23, 1977 EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 500 ft'is (14.2 e/s), and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft3/s) (m 3/s) (ft) (m) Date Time (ft3/s) (10/s) (ft) (m) Oct. 7 0300 *19,000 538 *25.30 7.711 Oct. 26 1745 896 25.4 9.97 3.039 Oct. 14 1615 651 18.4 7.89 2.405 May 13 2215 1,200 34.0 12.26 3.737 Oct. 23 1915 680 19.2 8.15 2.484 July 24 1445 713 20.2 8.43 2.569 Minimum discharge, 1.8 ft'/s (0.051 e/s), Mar. 17. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 26 61 18 6.8 5.6 4.2 4.2 22 i1 6.1 9.1 21 2 23 52 17 7.3 4.8 4.0 5.5 15 9.7 5.9 7.3 15 3 21 56 16 7.0 6.1 6.5 14 17 11 5.8 6.2 13 4 19 48 16 7.2 6.5 4.6 19 23 10 7,,6 5.3 13 5 23 45 15 7.1 7.6 4.0 18 18 9.7 8.0 4.9 10 6 519 90 16 7.3 5.4 3.4 15 19 9.3 8.6 4.9 9.2 7 1840 70 15 7.5 4.9 3.5 8.2 24 9.6 7.6 8.2 8.5 8 343 57 14 7.2 4.6 3.0 12 23 16 7.1 18 7.8 9 122 52 13 9.6 4.3 2.8 16 21 13 6.4 8.3 7.2 10 95 44 13 8.9 4.0 2.9 8.3 48 14 5.9 6.6 6.2 11 85 37 12 6.9 4.2 2.8 6.4 76 16 6.6 5.2 5.8 12 80 47 12 6.8 4.0 2.8 5.7 32 17 7.6 4.8 5.6 13 83 37 11 6.8 3.8 2.9 5.1 325 21 7.0 7.6 5.6 14 102 31 11 6.7 3.5 2.7 4.6 141 26 6.3 7.1 5.6 15 76 34 10 6.5 3.4 2.4 4.3 38 22 9.0 5.3 5.6 16 54 50 9.8 6.5 3.3 2.4 5.3 25 8.1 6.3 4.6 5.3 17 47 49 9.5 6.5 3.5 13 4.5 20 8.0 3.7 4.3 5.1 18 43 70 9.1 6.5 3.7 14 6.5 18 7,8 4.3 4.1 4.8 19 39 52 9.2 6.4 11 6.6 6.3 18 7.8 4.3 4.1 4.8 20 38 38 9.5 6.2 21 4.9 4.4 15 7.7 4.7 3.3 5.3 21 41 32 9.8 6.2 8.6 4.3 4.4 14 7.5 4.0 2.8 4.8 22 36 28 9.6 6.2 5.9 3.9 4.1 13 7.3 3.7 2.8 4.7 23 87 27 9.4 6.2 4.8 3.7 3.8 12 7.0 3.2 12 5.1 24 107 24 9.1 6.4 4.5 3.7 4.0 12 7.8 39 9.7 6.6 25 94 22 8.9 7.0 4.4 3.6 3.8 11 8.3 12 7.6 7.1 26 107 22 8.3 7.0 3.8 3.6 3.8 12 7.6 8.8 8.1 5.6 27 89 20 7.5 6.1 3.7 3.5 3.8 10 7.7 10 6.2 8.3 28 79 20 7.3 6.0 3.5 3.3 5.2 11 6.6 10 5.8 11 29 68 19 6.7 5.9 --- 10 34 16 6.5 9.2 35 7.4 30 109 19 6.7 9.5 7.4 26 15 6.5 13 22 6.1 31 83 --- 6.5 7.1 4.5 --- 14 --- 12 26 --- TOTAL 4578 1253 345.9 215.3 154.4 144.9 266.2 1078 327.5 253.7 267.2 231.1 MEAN 148 41.8 11.2 6.95 5.51 4.67 8.87 34.8 10.9 8.18 8.62 7.70 MAX 1840 90 18 9.6 21 14 34 325 26 39 35 21 MIN 19 19 6.5 5.9 3.3 2.4 3.8 10 6.5 3.2 2.8 4.7 CFSM 15.3 4.31 1.15 .72 .57 .48 .91 3.59 1.12 .84 .89 .79 IN. 17.56 4.81 1.33 .83 .59 .56 1.02 4.13 1.26 .97 1.02 .89 AC-FT 9080 2490 686 427 306 287 528 2140 650 503 530 458 CAL YR 1985 TOTAL 11799.9 MEAN 32.3 MAX 1840 MIN 1.7 CFSM 3.33 IN. 45.25 AC-FT 23410 WTR YR 1986 TOTAL 9115.2 MEAN 25.0 MAX 1840 MIN 2.4 CFSM 2.58 IN. 34.96 AC-FT 18080 235 RIO INABON BASIN 50112500 RIO INABON AT REAL ABAJO, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS AUGUST 1981 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) OCT, 28 1203 82 250 24.5 JUL, 22 1147 4.4 276 28.5 APR, 24 1150 4.0 272 25.5 AUG, 25 1203 7.0 255 29.0 MAY, 28 1041 11 245 25.5 SEP, 26 1204 5.5 265 28.5 JUN, 24 1014 6.8 256 26.0 236 RIO BUCANA BASIN 50114000 RIO CERRILLOS NEAR PONCE, PR Location.--Lat 18°04'15", long 66°34'51", Hydrologic unit 21010004, on right bank off Highway 139, 2.3 mi (3.7 km) upstream from Quebrada Ausubo and 4.6 mi (7.4 km) northeast of Plaza Degetau in Ponce. WATER-QUALITY RECORDS PERIOD OF RECORD.--Water years 1964 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1985 04... 1655 41 254 8.40 28.0 6.0 8.0 102 28 640 570 DEC 3... 1300 23 316 8.20 24.5 220 8.0 97 18 K120 550 FEB 1986 4... 1630 12 313 8.40 24.5 22 4.4. 53 40 K120 200 APR 30... 0955 45 225 8.00 22.5 20 8.5 100 12 K1800 3300 JUL 08... 1230 11 264 8.25 28.5 1.6 9.0 117 K18 66 SEP 04... 1310 25 240 8.10 27.0 23 8.4 107 31 570 530 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- HARD- NONCARB CALCIUM SLUM, SODIUM, AD- SLUM, WATER SULFATE RIDE, NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1985 04... 110 11 35 6.5 9.8 0.4 1.2 103 <0.5 18 8.0 DEC 03... 126 FEB 1i 6 04... 121 APR 30... 89 5 28 4.7 7.9 0.4 1.1 84 <0.5 13 7.4 JUL 08... 111 -- SEP 04... 110 8 34 5.5 8.9 0.4 1.2 100 15 6.2 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C. NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1985 04... <0.10 23 160 18 5 0.390 0.010 0.400 0.030 0.37 DEC 3... 478 0.650 0.050 0.700 0.120 0.28 FEB 1986 4... 27 <0.010 0.600 0.020 0.38 APR 30... <0.10 16 130 16 20 1.48 0.020 1.50 0.050 0.45 JUL 08... 5 <0.01C 0.200 0.020 0.28 SEP 04... <0.10 20 150 10 26 <1.010 0.500 0.040 0.26 K = non-ideal count RIO BUCANA BASIN 50114000 RIO CERRILLOS NEAR PONCE, PR--Continued WATER QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER. MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1985 04... 0.40 0.80 3.5 0.030 <1 <100 30 <1 3 <10 DEC 3... 0.40 1.1 4.9 0.130 FEB 1986 4... 0.40 1.0 4.4 0.040 -- APR 30... 0.50 2.0 8.9 0.080. <1 <100 30 <1 18 10 JUL 08... 0.30 0.50 2.2 0.030 SEP 04... 0.30 0.80 3.5 0.080 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1985 04... 760 <1 50 <0.10 <1 <1 20 <0.010 0.02 DEC 3... FEB 1986 4... APR 30... 1600 2 60 <0.10 <1 <1 10 <0.010 <1 0.05 JUL 08... SEP 04... 237 238 RIO PORTUGUES BASIN 50115000 RIO PORTUGUES NEAR PONCE, PR LOCATION.--Lat 18°04'45". long 66'38'01', Hydrologic Unit 21010004, on right bank 30 ft (9 a) upstream from bridge on Highway 504, 0.2 mi (0.3 km) upstream from small unnamed tributary. 4.4 mi (7.1 kn) upstream from Rio Chiquito, and 4.7 mi (7.6 km) north of "laza Degetau in Ponce. DRAINAGE AREA.--8.82 mil (22.84 km 2). 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.--No estimated daily discharges during water year. Records fair. Some low-flow regulation due to unknown activity upstream. AVERAGE DISCHARGE.--22 years (1965-86). 18.7 ft'/s (0.530 m'/s), 28.79 in/yr (731 mm/yr), 13,550 acre-ft/yr (16.7 he/yr); median of yearly mean discharges, 18 ft'is (0.51 m'/s), 13,000 acre-ft/yr (16 hm)/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 21,000 ft'is (595 m'/s), Oct. 7, 1985, gage height, 20.2 ft (6.16 m), from floodmarks at downstream side of bridge, from rating curve extended above 150 ft'/s (4.25 m'/s) on basis of slope-area measurement of peak flow; minimum discharge, 1.0 ft3/s (0.028 m'/s), May 29, 1973. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 800 ft'/s (22.6 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (10/s) (ft) (m) Date Time (W/s) (10/s) (ft) (m) Oct. 6 1530 2,990 84.7 9.78 2.981 Apr. 29 1530 911 25.8 6.01 1.832 Oct. 7 0500 *21,000 595 *20.20 6.157 Apr. 30 1730 1,220 34.6 6.72 2.048 Oct. 26 1815 1,120 31.7 6.50 1.981 May 13 0630 1,940 54.9 8.15 2.484 Oct. 29 2345 805 22.8 5.77 1.759 May 13 2200 2,660 75.3 9.31 2.838 Oct. 30 1400 1,000 28.3 6.20 1.890 July 31 1800 1,230 34.8 6.74 2.054 Nov. 6 1415 1,420 40.2 7.16 2.182 Minimum discharge, 2.8 ft'is (0.079 10/s), Apr. 27. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 18 79 18 11 5,5 4.5 4.3 57 16 8.8 46 65 2 17 60 18 11 5.5 4.2 4.2 23 15 9.0 17 26 3 16 72 18 8.0 5.9 4.4 20 22 19 9.1 15 14 4 15 51 17 7.9 8.3 4.3 26 15 18 8.0 13 12 5 17 40 17 7.7 9.5 4.3 12 13 16 8.1 33 9.8 6 559 187 16 7.2 5.9 4.2 6.8 13 15 6.6 12 9.1 7 1450 91 16 7.1 6.5 4.1 4.7 51 12 6.3 48 8.5 8 257 57 14 6.9 5.6 4.0 27 52 14 6.8 60 8.5 9 95 45 14 7.9 5.4 4.0 19 29 12 11 16 7.8 10 61 38 14 8.4 5.4 3.9 6.4 55 12 18 12 7.5 11 47 32 13 6.9 5.4 4.1 4.8 142 26 36 10 7.1 12 36 41 13 6.7 4.9 4.6 4.2 60 15 63 8.7 7.0 13 29 32 13 6.6 4.9 4.1 4.0 500 12 77 8.7 6.8 14 27 27 13 6.4 5.0 4.5 3.8 250 10 97 8.6 6.8 15 21 30 12 6.3 4.8 4.0 3.8 78 10 69 8.3 6.6 16 17 43 12 6.2 4.7 4.0 3.7 46 11 30 7.4 6.6 17 15 42 12 6.0 4.8 4.0 3.7 30 10 23 7.1 6.4 18 21 71 11 6.0 4.8 5.0 3.5 25 11 25 7.1 6.2 19 13 46 11 5.9 6.9 4.2 3.5 20 13 25 6.9 6.0 20 12 34 13 6.0 11 3.9 3.4 16 13 26 6.9 7.0 21 13 28 12 6.0 5.4 3.8 3.6 13 14 21 6.8 6.8 22 11 25 13 5.6 5.0 3.7 3.5 12 11 19 7.2 6.0 23 88 24 12 5.6 4.5 3.6 3.3 12 11 18 10 5.7 24 89 21 13 5.6 4.7 .3.6 3.3 11 11 35 10 6.5 25 64 20 12 6.2 4.8 3.7 3.2 11 11 24 17 6.5 26 136 18 12 7.2 4.4 3.5 3.2 14 9.1 18 14 6.6 27 80 18 11 5.5 4,5 3.4 3.0 13 10 20 11 22 28 65 18 11 5.7 4.5 3.4 8.6 13 11 21 11 12 29 66 18 11 7.8 --- 8.4 101 32 11 18 46 6.9 30 270 18 11 8.8 5.2 150 21 14 84 21 5.6 31 122 --- 11 8.1 3.9 --- 28 --- 144 44 --- TOTAL 3747 1326 414 218.2 158.5 130.5 451.5 1677 393.1 984.7 549.7 319.3 MEAN 121 44.2 13.4 7.04 5.66 4.21 15.1 54.1 13.1 31.8 17.7 10.6 MAX 1450 187 18 11 11 8.4 150 500 26 144 60 65 MIN 11 18 11 5.5 4.4 3.4 3.0 11 9.1 6.3 6.8 5.6 CFSM 13.7 5.01 1.52 .80 .64 .48 1.71 6.13 1.49 3.61 2.01 1.20 IN. 15.80 5.59 1.75 .92 .67 .55 1.90 7.07 1.66 4.15 2.32 1.35 AC-FT 7430 2630 821 433 314 259 896 3330 780 1950 1090 633 CAL YR 1985 TOTAL 10204.1 MEAN 28.0 MAX 1450 MIN 2.4 CFSM 3.17 IN. 43.04 AC-FT 20240 WTR YR 1986 TOTAL 10369.5 MEAN 28.4 MAX 1450 MIN 3.0 CFSM 3.22 IN. 43.74 AC-FT 20570 RIO PORTUGUES BASIN 50115000 RIO PORTUGUES NEAR PONCE, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORD.--Water years 1964 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1985 04... 1000 15 260 8.50 24.0 1.7 8.1 97 <10 K160 140 DEC 3... 0930 18 318 8.50 22.0 0.70 8.6 100 <10 73 69 FEB 1986 4... 1340 6.3 317 8.60 23.0 0.30 8.4 98 23 60 86 APR 11... 1230 5.1 300 8.40 25.5 1.5 8.4 105 22 350 50 JUL 08... 0930 5.8 297 8.20 24.5 1.2 9.6 117 <10 56 38 SEP 04... 0950 12 260 8.15 24.0 1.5 8.8 107 <10 330 550 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- RAR)- NONCARB CALCIUM SLUM, SODIUM, AD- SIUM, WATER SULFATE RIDE, NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1985 04... 130 10 40 6.9 9.5 0.4 1.3 118 <0.5 8.3 DEC 3... 128 FEB 1986 04.., 134 APR 11... 130 14 42 7.3 11 0.4 1.4 121 <0.5 10 9.3 JUL 08... 136 SEP 4... 120 4 37 6.5 9.0 0.4 1.4 115 7.8 7.4 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1985 04... 4 0.990 0.010 1.00 0.020 0.18 DEC 3... 4 <0.010 1.10 <0.010 FEB 1986 4... 3 <0.010 0.900 0.020 0.38 APR 11... 0.10 20 170 2.4 9 <0.010 1.4G 0.330 0.27 JUL 08... 4 - <0.010 0.700 0.030 0.27 SEP 04... 0.10 20 160 4.9 1 <0.010 1.00 <0.010 K = non-ideal count 239 240 RIO PORTUGUES BASIN 50115000 RIO PORTUGUES NEAR PONCE, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 NITRO- CHRO- GEN,AM- BARIUM, BORON, ,ADMIUM !CUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1985 04... 0.20 5.3 0.030 <1 <100 20 <1 1 <10 DEC 3... 0.30 6.2 0.040 -- FEB 1986 4... 0.40 5.8 0.040 APR 11... 0.60 8.9 0.070 <1 <100 20 <1 7 <10 JUL 08... 0.30 4.4 0.050 SEP 04... 0.40 1.4 6.2 0.050 -- MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1985 04... 160 2 20 <0.10 <1 <1 <10 <0.010 2 0.03 DEC 3... FEB 1986 4... APR 11... 100 3 10 <0.10 <1 <1 30 <0.010 <1 0.04 JUL 08... SEP 04... RIO PORTUGUES BASIN 50116200 RIO PORTUGUES AT PONCE, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°00'20", long 66°36'28", 1,300 ft (400 m) south of Las Americas Avenue Bridge, 1.2 mi (1.9 km) south of CSC 50115900, 0.8 mi (1.3 km) west of Highways 1 and 2 junction, and 0.7 mi (1.1 km) southeast of Ponce. DRAINAGE AREA.--18.9 sq mi (49.0 sq km). PERIOD OF RECORD.--Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 OXYGEN, OXYGEN COL1- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) NOV 1985 02... 1535 45 540 8.10 30.0 220 7.0 94 37 K130000 4100 DEC 2... 1740 65 546 7.90 27.5 3.2 7.8 100 14 K18000 9000 FEB 1986 25... 1415 4.2 686 7.60 31.0 14 8.6 116 30 APR 30... 1300 26 336 8.00 30.5 97 7.4 99 61 K170000 K19000 JUL 07... 1435 4.9 525 7.55 34.0 4.2 8.1 115 24 K6400 K160 SEP 3... 1555 15 343 8.25 34.0 60 7.6 108 <10 26000 9000 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- HARD- NESS NONCARB WATER CALCIUM DIS- SIUM, DIS- SODIUM, DIS- AD- SORP- SLUM, DIS- WATER TOTAL SULFIDE SULFATE DIS- RIDE, DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED . SOLVED DATE AS 'MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) NOV 1985 02... 200 26 59 12 24 0.8 2.2 171 <0.5 32 27 DEC 02... 152 FEB 1986 25... 174 APR 30... 120 0 35 7.4 20 0.8 2.1 118 <0.5 20 18 JUL 07... 164 SEP 03... 130 0 38 7.6 24 1 2.0 126 31 19 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) NOV 1985 2... 0.10 23 280 34 558 2.03 0.070 2.10 0.440 0.96 DEC 02. . 6 2.16 0.040 2.20 0.190 0.41 FEB 686 25... 25 1.46 0.040 1.50 0.090 0.41 APR 30... 0.10 17 190 13 194 1.75 0.050 1.80 0.400 0.60 JUL 07... 10 1.03 0.070 1.10 0.200 0.80 SEP 3... 0.20 20 220 8.6 39 0.550 0.050 0.600 0.230 0.67 K = non-ideal count 241 RIO PORTUGUES BASIN 50116200 RIO PORTUGUES AT PONCE. PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) NOV 1985 02... 1.4 3.5 15 0.530 1 200 80 <1 27 50 DEC 2... 0.60 2.8 12 0.110 FEB 1986 25... 0.50 2.0 8.9 0.140 APR 30... 1.0 2.8 12 0.330 <1 100 50 1 18 30 JUL 07... 1.0 2.1 9.3 0.190 SEP 3... 0.90 1.5 6.6 0.260 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) NOV 1985 02... 21000 14 720 0.10 <1 <1 100 <0.010 2 <0.01 DEC 02... FEB 1986 25... APR 30... 8800 14 290 <0.10 <1 <1 10 <0.010 1 0.05 JUL 07... - SEP 03... -- PESTICIDE ANALYSES CHLOR- DI- DI- PCB, ALDRIN, DANE, DOD, DDE, DDT, AZINON, ELDRIN DATE 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) JUL 1986 07... 1435 <0.1 <0.010 <0.1 <0.010 <0.010 <0.010 0.03 <0.010 HEPTA- METH- ENDO- HEPTA- CHLOR MALA- OXY- SULFAN, ENDRIN, ETHION, CHLOR, EPDXIDE LINDANE THION, CHLOR, DATE TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UC/L) JUL 1986 07... <0.010 <0.010 <0.01 <0.010 <0.010 <0.010 <0.01 <0.01 NAPH- THA- METHYL METHYL LENES, PARA- TRI- PARA- POLY- PER- TOX- TOTAL THION, THION, MIREX, THION, CHLOR. THANE APHENE, TRI- DATE TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL THION (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUL 1986 07... <0.01 <0.01 <0.01 <0.01 <0.10 <0.1 <1 <0,01 242 243 RIO GUAYANILLA BASIN 50124200 RIO GUAYANILLA NEAR GUAYANILLA, PR LOCATION.--Lat 18°02'40", long 66°47'53', Hydrologic Unit 21010004, on left bank, 0.7 mi (1.1 km) north of junction of Highways 2 and 132, 0.6 mi (1.0 km) downstream from Quebrada Consejo, 1.8 mi (2.9 km) north-northwest from Plaza de Guayanilla. DRAINAGE AREA.--18.9 mil (49.0 km 2). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--March 1981 to current year. GAGE.--Water-stage recorder. Elevation of gage is 80 ft (24 m) from topographic map. REMARKS.--Estimated daily discharges: Oct. 6, 7 and July 12 to Aug. 13. Records fair except those for estimated daily discharges, which are poor. AVERAGE DISCHARGE.--5 years (1982-86), 22.9 ft'is (0.648 m'/s), 16.45 in/yr (418 mm/yr), 16,590 acre-ft/yr (20.4 he/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 14,700 ft'is (416 m'/s), Sept. 12, 1982, gage height, 20.4 ft (6.21 m), from floodmarks, from rating curve extended above 100 ft'/s (2.83 m 3 /s) on basis of step-backwater analysis and indirect measurement of peak flow; minimum discharge, 1.8 ft'/s (0.051 11,/s), Apr. 17-19, 1981. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 800 ft'is (22.7 leis) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (0/s) (ft) (m) Date Time (W/s) (10/s) (ft) (m) Oct. 7 0445 *11,900 337 *19.13 5.831 May 13 2145 1,300 36.8 10.35 3.155 Oct. 23 1715 961 27.2 9.66 2.944 May 29 2100 961 27.2 9.66 2.944 Oct. 30 1330 1,000 28.3 9.75 2.972 Sept.27 1545 918 26.0 9.56 2.914 May 13 0630 1,340 37.9 10.43 3.179 Minimum discharge, 3.8 ft'/s (0.108 m',/s), Mar. 11, 12. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN VALUES DAY OCT HOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 19 138 22 10 6.4 4.7 4.3 18 18 6.6 44 16 2 15 109 21 9.7 6.3 4.5 4.4 7.7 14 6.6 14 10 3 17 113 20 9.7 6.6 4.5 17 6.9 13 6.3 11 7.7 4 17 92 20 9.7 7.3 4.5 68 7.3 12 7.4 9.0 6.8 5 19 82 20 9.3 9.1 4.5 18 7.6 11 7.1 32 6.6 6 600 89 20 8.9 6.8 4.3 9.2 5.6 9.7 7.4 10 6.0 7 1500 129 19 9.0 6.8 4.1 6.8 10 9.7 6.6 46 5.6 8 401 115 18 9.1 6.6 4.3 6.1 16 9.5 6.3 56 5.4 9 156 83 17 8.6 6.3 4.3 5.9 7.9 9.0 6.0 16 5.1 10 89 71 17 9.8 6.3 4.1 5.6 30 9.5 6.0 10 4.9 11 65 65 17 8.6 6.1 4.0 5.6 100 12 6.0 8.0 6.6 12 51 84 17 8.9 6.0 4.1 5.2 19 11 6.6 6.6 5.6 13 64 60 15 9.3 5.8 4.5 5.0 468 8.6 70 5.9 5.4 14 54 48 16 9.3 5.6 5.5 4.9 274 8.6 90 30 5.1 15 40 35 15 9.0 5.6 4.3 4.9 51 8.2 65 10 4.9 16 35 53 15 9.0 5.6 4.1 4.9 26 8.2 25 6.6 4.7 17 34 81 14 9.0 5.6 4.1 5.0 20 7.9 20 6.3 4.5 18 70 F7 14 9.0 5.6 4.1 5.1 18 7.4 25 6.0 4.5 19 33 39 14 8.8 5.6 4.2 4.9 17 7.4 27 5.8 4.3 20 29 34 13 8.9 7.4 4.3 4.6 15 7.3 30 5.6 7.2 21 27 31 13 9.0 5.8 4.2 4.7 14 7.0 18 5.1 50 22 27 29 13 8.7 5.1 4.1 4.7 13 7.2 16 10 7.4 23 210 29 13 8.4 4.8 4.1 4.6 13 7.9 15 23 5.6 24 184 28 12 8.3 4.7 4.2 4.3 12 8.3 35 9.0 4.9 25 154 26 12 9.0 4.7 4.5 4.3 13 7.7 18 5.1 4.9 26 144 24 12 9.3 4.7 4.3 4.3 16 7.7 13 4.7 116 27 183 24 11 8.2 4.7 4.1 4.3 15 8.0 16 4.1 221 28 266 23 11 7.8 4.7 4.0 5.2 16 7.7 21 4.0 86 29 142 23 11 18 --- 4.8 7.9 135 7.1 13 8.6 26 30 355 23 10 7.6 --- 4.9 39 38 6.3 76 5.4 52 31 244 --- 10 6.8 4.2 --- 42 --- 130 87 --- TOTAL 5244 1837 473 284.7 166.6 134.4 278.7 1452.0 276.9 801.9 504.8 700.7 MEAN 169 61.2 15.3 9.18 5.95 4.34 9.29 46.8 9.23 25.9 16.3 23.4 MAX 1500 138 22 18 9.1 5.5 68 468 18 130 87 221 MIN 15 23 10 6.8 4.7 4.0 4.3 5.6 6.3 6.0 4.0 4.3 CFSM 8.94 3.24 .81 .49 .31 .23 .49 2.48 .49 1.37 .86 1.24 IN. 10.32 3.62 .93 .56 .33 .26 .55 2.86 .55 1.58 .99 1.38 AC-FT 10400 3640 938 565 330 267 553 2880 549 1590 1000 1390 CAL YR 1985 TOTAL 12871.1 MEAN 35.3 MAX 1500 MIN 2.9 CFSM 1.81 IN. 25.33 AC-FT 25530 WTR YR 1986 TOTAL 12154.7 MEAN 33.3 MAX 1500 MIN 4.0 CFSM 1.76 IN. 23.92 AC-FT 24110 244 RIO GUAYANILLA BASIN 50124700 RIO GUAYANILLA AT CENTRAL RUFINA, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°00'40", long 66°46'49", at dirt road bridge, 0.7 mi (1.1 km) from mouth, 0.9 mi (1.4 km) east of Central Rufina and 0.9 mi (1.4 km) southeast of Guayanilla. DRAINAGE AREA.--22.8 sq mi (59.1 sq km). PERIOD OF RECORD.--Water years 1960-65, 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1985 03... 1650 9.0 423 8.30 30.0 7.0 6.4 16 520000 35000 DEC 6... L150 13 523 8.40 27.5 2.4 7.8 99 13 K65000 K11000 FEB 1986 7... 1030 2.8 873 1.50 26.5 2.7 0 79 23000 K120000 MAY 01... 0925 27 318 7.80 23.5 23 8.2 97 17 K5000 4000 JUL 09... 0905 1.7 808 7.50 27.5 2.8 1.2 15 39 35000 K5500 SEP 05... 0915 2.0 705 7.65 28.0 1.7 4.0 51 12 K9900 K1000 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- HARD- NONCARB CALCIUM SLUM, SODIUM, AD- SLUM, WATER SULFATE RIDE, NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L TOT FLU SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1985 03... 170 33 44 14 22 0.8 2.6 135 <0.5 46 22 DEC 6... FEB 1986 7... 266 MAY 01... 120 12 32 9.4 11 0.5 1.8 107 <0.5 25 13 JUL 09... 267 SEP 05... 280 32 76 21 43 1 4.1 244 73 44 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1985 03... 0.10 19 250 6.1 1. C.070 0.030 0.100 1.60 0.70 DEC 6... 5 0.740 0.060 0.800 1.70 0.30 FEB 1986 7... 11 0.380 0.120 0.500 13.0 MAY 01... <0.10 14 170 13 37 1.17 0.030 1.20 0.760 0.44 JUL 09... 6 0.160 (.04C 0.200 5.50 3.6 SEP 05... 0.10 23 430 2.3 1 0.350 0.050 0.400 5.40 2.4 K = non-ideal count 245 RIO GUAYANILLA BASIN 50124700 RIO GUAYANILLA AT CENTRAL RUFINA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1985 03... 2.3 2.4 11 0.640 1 <100 30 <1 5 10 DEC 06... 2.0 2.8 12 0.410 FEB 1986 07... 2.20 -- MAY 01... 1.2 2.4 11 0.250 2 100 40 <1 12 10 JUL 09... 9.1 9.3 41 1.80 SEP 05... 7.8 8.2 36 1.70 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/.L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1985 03... 4 80 0.20 <1 <1 20 <0.010 2 0.35 DEC 6... FEB 1986 7... MAY 01... 2200 1 100 <0.10 <1 <1 30 <0.010 <1 0.07 JUL 09... -- SEP 05... PESTICIDE ANALYSES CHLOR- DI- DI- PCB, ALDRIN, DANE, ODD, DOE, DDT, AZINON, ELDRIN DATE 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) JUL 1986 09... 0905 <0.1 <0.010 <0.1 <0.010 <0.010 <0.010 0.07 <0.010 DATE HEPTA- METH- ENDO- HEPTA- CHLOR MALA- OXY- SULFAN, ENDRIN, ETHION, CHLOR, EPDXIDE LINDANE THION, CHLOR, TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUL 1986 09... <0.010 <0.010 <0.01 <0.010 <0.010 <0.010 0.02 <0.01 NAPH- THA- METHYL METHYL LENES, PARA- TRI- PARA- POLY- PER- TOX- TOTAL THION, THION, MIREX, THION, CHLOR. THANE APHENE, TRI­ DATE TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL THION (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUL 1986 09... <0.01 <0.01 <0.01 <0.01 <0.10 <0.1 <1 <0.01 RIO LOCO BASIN 50129700 RIO LOCO AT GUANICA. PR WATER-QUALITY RECORDS LOCATION.--Lat 17°58'33", long 66'54'52", 0.6 mi (1.0 km) northwest of Guanica and 1.2 mi (1.9 km) northeast of Ensenada. DRAINAGE AREA.--Indeterminate. PERIOD OF RECORD.--Water years 1975 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLT - STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1985 03... 1215 370 284 8.10 26.0 53 <10 K14000 600 DEC 6... 0920 663 8.20 24.0 17 7.2 15 K450 K910 FEB 1986 7... 1230 21100 7.40 27.0 0.50 0 190 2000 2000 MAY 01... 1235 9100 7.60 26.0 19 3.2 41 120 K9500 6500 JUL 09... 1120 7200 7.85 30.0 7.8 5.4 73 /9 370 270 SEP 05... 1120 6750 7.55 30.0 4.6 4.0 54 310 600 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- HARD- NONCARB CALCIUM SLUM, SODIUM, AD- SLUM, WATER SULFATE RIDE, NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED T1ON SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1985 03... 110 6 26 10 11 0.5 2.1 100 <0.5 12 9.6 DEC 06... 192 FEB 196 07... 233 7500 MAY 01... 1000 850 80 200 1500 21 52 178 <0.5 410 2700 JUL 09... 288 2300 SEP 05... 840 580 90 150 1200 18 41 267 340 2100 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+1403 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1985 03... <0.10 17 150 148 15 0.790 0.010 0.800 0.040 0.46 DEC 6... 26 1.28 0.020 1.30 0.040 0.46 FEB 1986 7... 30 0.480 0 020 0.500 0.180 0.62 MAY 01... 0.30 17 5100 25 0.380 0 020 0.400 0.060 0.54 JUL 09... -- 7 0.380 0.020 0.400 0.130 0.47 SEP 05... 0.30 27 4100 13 0.290 0.010 0.300 0.080 0.52 K = non-ideal count E = estimate 246 247 RIO LOCO BASIN 50129700 RIO LOCO AT GUANICA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (KG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1985 03... 0.50 1.3 5.8 0.080 <1 <100 20 <1 30 30 DEC 6... 0.50 1.8 8.0 0.090 FEB 1986 7... 0.80 1.3 5.8 0.130 MAY 01... 0.60 1.0 4.4 0.170 1 100 660 1 19 20 JUL 09... 0.60 1.0 4.4 0.140 SEP 5... 0.60 0.90 4.0 0.090 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1985 03... 4900 12 170 0.90 <1 <1 20 <0.010 0.04 DEC 6... FEB 1986 7... MAY 01... 890 1 90 <0.10 <1 <1 20 <0.010 <1 0.31 JUL 09... SEP 05... PESTICIDE ANALYSES CHLOR- DI- DI- PCB, ALDRIN, DANE, DDD, DDE, DDT, AZINON, ELDRIN DATE 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) JUL 1986 09... 1120 <0.1 <0.010 <0.1 <0.010 <0.010 <0.010 0.01 <0.010 HEPTA- METH- ENDO- HEPTA- CHLOR MALA- OXY- SULFAN, ENDRIN, ETHION, CHLOR, EPDXIDE LINDANE THION, CHLOR, DATE TOTAL TOTAL TOTAL TOTAL TCTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUL 1986 09... <0.010 <0.010 <0.01 <0.010 <0.010 <0.010 <0.01 <0.01 NAPH- THA- METHYL METHYL LENES, PARA- TRI- PARA- POLY- PER- TOX- TOTAL THION, THION, MIREX, THION, CHLOR. THANE APHENE, TRI­ DATE TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL THION (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUL 1986 09... <0.01 <0.01 <0.01 <0.01 <0.10 <0.1 <1 <0.01 MAYAGUEZ Ycgiiez bas.in e 46cec, tclin MARICAO 1380 HORMtG III Dr airioge boundary Mond divode Rfo Youco basin A ROJO SAN GERMAN Rill Loco Cosier Map area Bocturron 1299,129899 Drainage boundary EXPLANATION 1380 SURFACE—WATER STATION AND NUMBER 7 QUALITY—OF—WATER STATION 129 AND NUMBER 0143 WELL AN WELL NUMBER Coosti 12 ENSENADA GUAN1CA 5 KILOMETERS 1 5 MILES Figure 20.--Southeastern river basins--Rio Humacao to Rio Seco basins. I I I 250 LAGUNA CARTAGENA BASIN 50129899 LAGUNA CARTAGENA NEAR BOQUERON, PR LOCATION.--Lat 18°00'52*, long 67°06'33". Hydrologic Unit 21010004, on right bank, 0.6 i (1.0 km) south of Hacienda Desenganci, and 4.3 i (6.9 km) southeast of Boqueron. DRAINAGE AREA.--Indeterminate. LAKE LEVEL RECORDS PERIOD OF RECORD.--June 1984 to current year. GAGE.--Water-stage recorder. Elevation of gage is 36 ft (11 m), from topographic ap. REMARKS.--Records fair. EXTREMES OBSERVED FOR PERIOD OF RECORD.--Maximum elevation, 15.39 ft (4.691 m), Nov. 3, 1985; minimum elevation, 7.43 ft (2.265 m), July 29, 1985. EXTREMES OBSERVED FOR CURRENT YEAR.--Maximum elevation, 14.17 ft (4.319 m), Oct. 7; minimum elevation, 7.54 ft (2.298 m), May 4-6. ELEVATION (FEET NGVD), WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATIONS AT 2400 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 8.50 9.56 8.55 8.23 8.23 7.86 7.59 7.56 8.38 7.67 8.02 8.16 2 8.45 9.28 8.52 8.21 8.23 7.82 7.60 7.56 8.37 7.65 8.02 8.19 3 8.40 9.11 8.48 8.21 8.28 7.75 7.60 7.55 8.33 7.62 8.02 8.20 4 8.35 8.98 8.45 8.20 8.28 7.73 7.61 7.54 8.25 7.62 7.99 8.19 5 8.32 8.87 8.43 8.20 8.27 7.70 7.61 7.54 8.19 7.62 7.97 8.17 6 9.33 9.19 8.41 8.20 8.26 7.67 7.62 7.62 8.13 7.52 7.95 8.17 7 13.95 10.70 8.39 8.20 8.24 7.66 7.62 7.59 8.08 7.62 7.95 8.19 8 13.38 10.68 8.38 8.18 8.22 7.65 7.63 7.58 8.03 7.62 7.93 8.18 9 12.33 10.10 8.36 8.18 8.21 7.63 7.63 7.58 7.98 7.61 7.92 8.15 10 11.59 9.61 8.35 8.17 8.19 7.57 7.63 9.46 7.96 7.60 7.92 8.13 11 10.99 9.38 8.34 8.17 8.17 7.56 7.62 10.64 8.03 7.61 7.85 8.11 12 10.35 9.52 8.34 8.16 8.15 7.60 7.62 10.09 7.99 7.62 7.71 8.09 13 9.85 10.56 8.33 8.16 8.12 7.89 7.62 13.64 7.97 7.58 7.63 8.09 14 9.79 10.32 8.31 8.16 8.11 7.87 7.62 12.68 7.94 7.64 7.70 8.09 15 9.42 9.73 8.30 8.19 8.09 7.88 7.62 11.60 7.94 7.69 7.60 8.09 16 9.12 9.36 8.29 8.19 8.08 7.89 7.62 10.77 7.93 7.71 7.60 8.07 17 9.03 9.20 8.29 8.18 8.07 7.91 7.62 10.05 7.91 7.80 7.61 8.05 18 9.76 9.19 8.29 8.18 8.05 7.98 7.61 9.57 7.89 7.83 7.62 8.03 19 9.51 9.15 8.28 8.17 8.04 7.99 7.62 9.29 7.90 7.84 7.62 8.02 20 9.21 9.07 8.28 8.17 8.03 8.00 7.61 9.10 7.88 7.34 7.62 8.02 21 9.02 8.99 8.28 8.17 8.02 8.00 7.61 8.96 7.87 7.84 7.63 8.15 22 8.90 8.92 8.29 8.17 8.01 8.00 7.61 8.84 7.84 7.83 7.65 8.19 23 9.68 8.87 8.28 8.17 8.01 8.00 7.60 8.75 7.83 7.89 7.85 8.14 24 9.96 8.85 8.26 8.17 7.98 8.00 7.59 8.67 7.82 7.94 7.91 8.15 25 9.64 8.83 8.25 8.21 7.97 7.99 7.59 8.63 7.82 7.91 7.95 8.15 26 9.34 8.79 8.23 8.22 7.95 7.99 7.59 8.60 7.82 7.91 7.95 8.35 27 9.17 8.73 8.22 8.23 7.93 7.96 7.60 8.54 7.81 7.95 7.96 8.84 28 9.10 8.68 8.21 8.21 7.91 7.97 7.60 8.40 7.78 8.01 7.98 9.06 29 9.06 8.63 8.22 8.22 --- 7.95 7.57 8.42 7.76 8.03 8.06 9.03 30 10.09 8.59 8.24 8.23 7.59 7.57 8.39 7.73 8.02 8.09 8.99 31 9.97 --- 8.24 8.23 7.60 --- 8.38 --- 8.02 8.13 --- MEAN 9.79 9.31 8.33 8.19 8.11 7.83 7.61 9.02 7.97 7.77 7.85 8.25 MAX 13.95 10.70 8.55 8.23 8.28 8.00 7.63 13.64 8.38 8.03 8.13 9.06 MIN 8.32 8.59 8.21 8.16 7.91 7.56 7.57 7.54 7.73 7.58 7.60 8.02 251 LAGUNA CARTAGENA BASIN 50129900 LAGUNA CARTAGENA OUTFLOW NEAR BOQUERON, PR LOCATION.--Lat 18°00'52", long 67°06'34", Hydrologic Unit 21010004, on right bank, 0.6 mi (1.0 km) south of Hacienda Desengano, and 4.3 mi (6.9 km) southeast of BoquerOn. DRAINAGE AREA.--Indeterminate. WATER-DISCHARGE RECORDS PERIOD OF RECORD.--June 1984 to current year. GAGE.--Water-stage recorder. Elevation of gage is 36 ft (11 m), from topographic map. REMARKS.--No estimated daily discharges during water year. Records fair. EXTREMES FOR PERIOD Or PECORU.--Maximum discharge, 1,290 ft,/s (36.5 e/s), Nov. 3, 1984, gage height, 15.39 ft (4.691 m), from rating curve extended above 50 ft'is (1.42 0/s) on basis of step-backwater analysis; no flow part or all of each day Mar 8-12, Mar. 31 to May 9, July 2-16, Aug. 14-22, 1986. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 60 ft3/s (1.70 m3/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft3/s) (m3/s) (ft) (m) Date Time (ft3/s) (m3/s) (ft) (m) Oct. 7 1400 *751 21.3 *14.17 4.319 May 11 1100 74 2.10 10.75 3.277 Nov. 8 0545 87 2.46 10.95 3.338 May 14 0200 594 16.8 13.71 4.179 Nov. 14 0315 69 1.95 10.65 3.246 No flow part or all of each day Mar. 8-12, Mar. 31 to May 9, July 2-16, Aug. 14-22. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 3.6 32 3.8 .93 .93 .09 .00 .00 2.4 .01 .19 .60 2 3.1 21 3.4 .87 .93 .07 .00 .00 2.4 .00 .19 .80 3 2.7 15 3.0 .78 1.1 .04 .00 .00 2.1 .00 .19 .95 4 2.2 12 2.7 .76 1.2 .03 .00 .00 1.6 .00 .15 .94 5 1.8 9.7 2.4 .78 1.2 .02 .00 .00 1.1 .00 .14 .85 6 3.3 9.4 2.1 .78 1.1 .01 .00 .00 .75 .00 .12 .76 7 516 28 1.9 .78 1.0 .01 .00 .00 .44 .00 .11 .83 8 650 81 1.8 .71 .91 .00 .00 .00 .26 .00 .11 .89 9 371 56 1.7 .67 .82 .00 .00 .00 .17 .00 .10 .80 10 200 34 1.5 .64 .70 .00 .00 3.6 .13 .00 .09 .64 11 119 22 1.5 .62 .60 .00 .00 67 .17 .00 .08 .53 12 70 20 1.5 .57 .55 .00 .00 55 .17 .00 .03 .44 13 44 32 1.5 .56 .42 .04 .00 344 .14 .00 .01 .36 14 31 63 1.3 .54 .31 .09 .00 485 .12 .00 .00 .41 15 27 41 1.2 .64 .31 .09 .00 229 .11 .00 .00 .39 16 17 24 1.2 .73 .27 .10 .00 109 .11 .00 .00 .36 17 13 17 1.1 .71 .26 .10 .00 57 .10 .02 .00 .28 18 15 15 1.1 .67 .24 .16 .00 33 .09 .05 .00 .23 19 29 14 1.1 .65 .21 .21 .00 22 .08 .05 .00 .21 20 20 14 1.1 .62 .21 .23 .00 16 .08 .05 .00 .19 21 14 11 1.1 .62 .18 .23 .00 13 .07 .05 .00 .54 22 11 10 1.1 .62 .19 .23 .00 10 .06 .05 .00 .42 23 12 8.6 1.1 .62 .18 .23 .00 8.2 .05 .07 .01 .24 24 41 8.2 1.1 .62 .16 .23 .00 6.7 .05 .08 .0.7 .12 25 32 7.9 .99 .65 .15 .23 .00 5.6 .05 .09 .10 .08 26 24 7.4 .91 .81 .13 .21 .00 5.2 .04 .09 .11 .11 27 16 6.5 .81 .88 .12 .19 .00 4.6 .04 .10 .12 1.1 28 15 5.6 .73 .86 .11 .17 .00 3.4 .04 .14 .13 5.2 29 12 4.9 .80 .84 --- .17 .00 2.4 .03 .21 .23 5.2 30 19 4.3 .86 .86 .12 .00 2.6 .02 .20 .31 4.6 31 44 --- .99 .96 .00 --- 2.5 --- .19 .52 --- TOTAL 2378.7 634.5 47.39 22.35 14.49 3.30 .00 1484.80 12.97 1.45 3.11 29.07 MEAN 76.7 21.1 1.53 .72 .52 .11 .00 47.9 .43 .05 .10 .97 MAX 650 81 3.8 .96 1.2 .23 .00 485 2.4 .21 .52 5.2 MIN 1.8 4.3 .73 .54 .11 .00 .00 .00 .02 .00 .00 .08 CFSM .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 IN. .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 AC-FT 4720 1260 94 44 29 6.5 .00 2950 26 2.9 6.2 58 CAL YR 1985 TOTAL 3882.72 MEAN 10.6 MAX 650 MIN .00 CFSM .00 IN. .00 AC-FT 7700 WTR YR 1986 TOTAL 4632,13 MEAN 12.7 MAX 650 MIN .00 CFSM .00 IN. .00 AC-FT 9190 LAGUNA CARTAGENA BASIN 50129900 LAGUNA CARTAGENA OUTFLOW NEAR BOQUERON, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS AUGUST 1984 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) NOV, 12 1320 21.4 414 25.0 MAR. 05 1203 0.02 1100 25.0 DEC, 12 1207 1.4 504 21.5 252 I 253 LAGUNA JOYUDA BASIN 50130320 QUEBRADA MAMEY AT JOYUDA, PR LOCATION.--Lat 18°07'51", long 67°10'09", Hydrologic Unit 21010003, 1.1 mi (1.8 km) northeast of Joyuda and 0.3 mi (0.5 km) upstream from Laguna Joyuda. DRAINAGE AREA.--0.38 mil (0.98 km2 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--November 1985 to September 1986. GAGE.--Water-stage recorder. Elevation of gage is 5.77 ft (1.75 m) above mean sea level. REMARKS.--No estimated daily discharges during the period of record. Records fair. EXTREMES FOR CURRENT PERIOD.--Peak discharges greater than base discharge of 12 ft'is (.340 m'is) and maximum (*): Discharye Gage height Discharge Gage height Date Time (ft3/s) (m3 /s) (ft) (m) Date Time (ft 3 /s) (m 3 /s) (ft) (m) Apr. 29 1545 13 .368 14.99 4.569 May 29 2100 13 .368 14.97 4.563 May 3 1630 22 .623 15.27 4.654 July 15 1430 17 .481 15.13 4.612 May 6 2130 40 1.13 15.71 4.788 July 23 1700 16 .453 15.11 4.605 May 13 0430 64 1.81 16.14 4.919 July 30 1545 17 .481 15.13 4.612 May 13 2015 *119 3.37 *16.85 5.136 No flow any days. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 .06 .04 .02 .01 .00 .08 .32 .08 .20 .26 2 .06 .04 .02 .01 .00 .08 .28 .07 .13 .20 3 .06 .04 .02 .01 .00 2.6 .25 .07 .17 .20 4 .06 .04 .04 .01 .01 .48 .21 .07 .20 .18 5 .06 .04 .02 .01 .01 .46 .19 .62 .21 .15 6 .06 .04 .02 .01 .00 3.0 .17 .17 .20 .14 7 .06 .04 .02 .01 .00 2.3 .16 1.1 2.5 .12 8 .07 .04 .02 .02 .00 .21 .17 .17 .71 .13 9 .13 .04 .02 .02 .00 .13 .15 .11 .40 .12 10 .07 .04 .02 .02 .00 .64 .16 .09 .36 1.1 11 .07 .03 .02 .02 .00 .39 .42 .09 .29 .22 12 .06 .03 .01 .03 .00 .24 .20 .08 .27 .15 13 .06 .03 .01 .19 .00 16 .15 .07 .30 .16 14 .06 .03 .01 .07 .00 4.7 .15 .31 .27 .17 15 .06 .03 .02 .03 .00 1.3 .54 1.6 .24 .13 16 .07 .03 .01 .03 .00 .87 .17 .14 .21 .11 17 .07 .03 .01 .05 .00 .75 .14 .45 .20 .10 18 .07 .03 .02 .05 .02 .65 .12 .17 .19 .09 19 .06 .02 .05 .04 .01 .58 .11 .08 .17 .08 20 .06 .02 .02 .03 .01 .52 .10 .71 .16 1.2 21 .06 .02 .02 .03 .01 .47 .09 .14 .16 .30 22 .06 .02 .02 .03 .01 .42 .08 .08 .18 .14 23 .06 .02 .01 .02 .01 .38 .08 1.5 .30 .11 24 .06 .02 .01 .02 .01 .36 .08 .17 .79 .11 25 .06 .42 .01 .02 .01 .34 .08 .13 .22 .12 26 .05 .05 .04 .01 .02 .01 .33 .08 .11 .17 .15 27 .06 .05 .02 .01 .02 .01 .30 .09 .22 .14 .16 28 .06 .05 .02 .01 .02 .01 .37 .08 .14 .13 .16 29 .06 .05 .03 --- .01 1.7 1.6 .08 .10 .32 .15 30 .06 .05 .02 .01 .12 .66 .08 1.7 .17 .15 31 --- .04 .02 .00 --- .37 --- .82 1.3 --- TOTAL 1.92 1.33 .50 .87 1.96 41.58 4.98 11.36 11.26 6.56 MEAN .06 .04 .02 .03 .06 1.34 .17 .37 .36 .22 MAX .13 .42 .05 .19 1.7 16 .54 1.7 2.5 1.2 MIN .04 .02 .01 .00 .00 .08 .08 .07 .13 .08 CFSM .16 .11 .05 .07 .17 3.53 .45 .97 .95 .58 IN. .19 .13 .05 .09 .19 4.07 .49 1.11 1.10 .64 AC-FT 3.8 2.6 .0 1.7 3.9 82 9.9 23 22 13 254 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 sq mi (117.8 sq km). PERIOD OF RECORD.--Water years 1979 to current year. WATER QUALITY DATA, WATER YEARS OCTOBER 1985 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1985 02... 0815 44 426 8.00 25.5 12 12 5200 510 DEC 5... 0745 28 574 7.90 23.0 5.2 4.4 52 12 K15000 2000 FEB 1986 6... 0900 18 709 7.70 21.5 1.5 2..0 36 20000 530 MAY 02... 1150 55 369 7.60 26.5 24 5.6 73 23 K18000 4500 JUL 10... 1205 8.2 632 7.75 28.5 3.0 4.3 56 <10 K550 <100 SEP 17.,. 1100 5.7 665 7.85 27.5 2.2 4.0 51 30 <1000 <1000 HARD- ALKA- NESS MAGNE- SODIUM ROTAS- LINITY CHLO- HARD- NONCARB CALCIUM SIUM, SODIUM, AD- SIUM, WATER SULFATE RIDE, NESS WATER OIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS 5) AS SO4) AS CL) OCT 1985 02... 200 19 22 35 12 0.4 1.6 180 <0.5 20 14 DEC 5... 216 FEB 1986 6... 241 MAY 02... 160 7 18 28 12 0.4 2.0 153 <0.5 15 15 JUL 10... 249 32 SEP 17... 250 0 27 45 42 1 3.5 253 51 37 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO20403 AMMONIA ORGANIC SOLVED (MG/L D1S- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) 5102) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1985 02... 0.20 33 250 29 77 0.650 0.050 0.700 0.140 0.36 DEC 5... 7 0.510 0.090 0.600 0.390 0.51 FEB 1986 6... 9 0.400 0.100 0.500 1.20 0.40 MAY 02... 0.10 29 210 31 36 0.630 0.170 0.700 0.570 0.43 JUL 10... 6 0.470 0.130 0.600 1.60 0.40 SEP 17... 0.90 36 390 6.1 2 0.500 0.100 0.600 2.40 0.80 K = non-ideal count 255 RIO GUANAJIBO BASIN 50133600 RIO GUANAJIBO NEAR SAN GERMAN, PR--Continued WATER QUALITY DATA, WATER YEARS OCTOBER 1985 TO SEPTEMBER 1986 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA t NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1985 02... 0.50 1.2 5.3 0.300 <1 <100 40 <1 9 10 DEC 5... 0.90 1.5 6.6 0.500 FEB 1986 6... 1.6 2.1 9.3 1.30 MAY 02... 1.0 1.7 7.5 0.340 1 100 50 <1 42 20 JUL 10... 2.0 2.6 12 0.850 SEP 17... 3.2 3.8 17 1.80 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CH) (UG/L) (MG/L) OCT 1985 02... 930 2 0.10 <1 <1 20 <0.010 1 0.05 DEC 5... FEB 1986 6... MAY 02... 1800 <1 140 <0.10 <1 <1 20 <0.010 3 0.07 JUL 10... SEP 17... 256 RIO GUANAJIBO BASIN 50136000 RIO ROSARIO AT ROSARIO, PR LOCATION.--Lat 18°10'22", long 67°04'31", Hydrologic Unit 21010003, on left bank above low dam, 0.2 mi (0.3 km) below Quebrada Figueroa, 0.7 mi (1.1 km) northeast of Rosario, and 1.6 mi (8.6 km) below Quebrada Palma. DRAINAGE AREA.--16.4 mi 2 (42.5 km2). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--January 1960 to June 1966 (gage-height records only) in files of Puerto Rico Water Resources Authority. June 1975 to September 1986 (discontinued). GAGE.--Water-stage recorder and concrete control. Elevation of gage is 230 ft (70 c), from topographic map. REMARKS.--Estimated daily discharges: Oct. 1-6, Nov. 13 to Dec. 12, May 16-27, June 1-9, June 17 to July 10. Records poor. AVERAGE DISCHARGE.--11 years (1976-86), 46.4 ft'/s (1.314 m'/s), 38.42 in/yr (976 mm/yr), 33,620 acre-ft/yr (41.4 hoO/yr); median of yearly mean discharges, 46 ft'is (1.30 10/s), 33,300 acre-ft/yr (41 hm,/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 33,800 ft'/s (957 m'/s), Sept. 16, 1975, gage height, 19.6 ft (5.97 m), from floodmarks, from rating curve extended above 60 ft'is (1.70 10/s) on basis of slope-area measurement of peak flow; minimum daily discharge, 2.4 ft'/s (0.068 10/s), June 18, 21, 1977. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,500 ft'is (42.5 10/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (m 3/s) (ft) (m) ate Time (W/s) (80/s) (ft) (m) (ft'/s) s) Oct. 7 0715 *5,590 158 *9.26 2.822 May 13 2145 1,710 48.4 5.86 1.786 Oct. 19 1630 1,500 42.5 5.58 1.701 June 12 1845 2,780 78.7 7.05 2.149 Oct. 28 1445 1,570 44.5 5.68 1.731 June 15 1645 4,180 118 8.22 2.505 Minimum discharge, 8.2 ft'is (0.232 m'/s), Apr. 13-15. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 78 134 32 22 17 12 10 16 54 32 100 30 2 66 118 31 22 17 11 10 19 47 30 52 27 3 78 115 30 22 19 12 14 124 44 29 42 54 4 62 134 30 22 22 12 26 167 41 28 42 33 5 54 206 30 21 18 11 15 142 38 29 37 26 6 1200 135 30 20 17 12 11 65 35 31 34 23 7 1350 103 28 20 17 12 10 124 36 28 46 21 8 272 92 28 20 16 14 10 73 43 28 39 26 9 203 83 27 19 15 13 11 59 38 26 34 23 10 164 71 28 20 15 12 9.6 147 65 24 32 21 11 120 84 26 19 15 12 11 140 177 23 32 20 12 100 70 27 19 14 12 9.0 65 353 22 30 20 13 87 56 28 19 15 12 8.5 527 192 21 44 20 14 96 50 27 18 14 12 8.2 309 112 21 81 20 15 125 56 27 18 14 13 8.5 121 506 26 70 19 16 88 62 26 17 14 11 9.7 110 223 32 39 19 17 74 76 26 18 14 12 9.0 84 100 47 35 19 18 68 62 25 18 14 15 81 72 80 29 32 20 19 237 50 25 17 20 13 53 64 62 25 30 25 20 235 45 24 17 24 12 35 56 56 89 29 39 21 275 43 24 18 15 11 21 52 50 76 27 31 22 164 41 23 21 14 11 25 48 46 32 26 65 23 166 40 23 17 13 11 22 46 42 26 50 36 24 163 38 23 17 13 12 17 43 40 148 38 31 25 119 36 23 26 13 16 16 42 39 73 47 30 26 167 35 23 28 13 12 19 45 37 43 39 32 27 342 34 23 17 12 12 16 42 37 42 31 44 28 326 32 22 17 12 11 16 100 35 47 27 43 29 191 31 22 18 --- 11 23 13" 33 38 27 87 30 194 31 22 22 11 18 10 32 130 28 64 31 164 --- 22 22 11 --- 6, .. --- 135 41 --- TOTAL 7028 2163 805 611 436 374 552.5 3208 2693 1410 1261 968 MEAN 227 72.1 26.0 19.7 15.6 12.1 18.4 103 89.8 45.5 40.7 32.3 MAX 1350 206 32 28 24 16 81 527 506 148 100 87 MIN 54 31 22 17 12 11 8.2 16 32 21 26 19 CFSM 13.8 4.40 1.59 1.20 .95 .74 1.12 6.28 5.48 2.77 2.48 1.97 IN. 15.94 4.91 1.83 1.39 .99 .85 1.25 7.28 6.11 3.20 2.86 2.20 AC-Fl 13940 4290 1600 1210 865 742 1100 6360 5340 2800 2500 1920 CAL YR 1985 TOTAL 20693 MEAN 56.7 MAX 1350 MIN 11 CFSM 3.46 IN. 46.94 AC-FT 41040 WTR YR 1986 TOTAL 21509.5 MEAN 58.9 MAX 1350 MIN 8.2 CFSM 3.59 IN. 48.79 AC-FT 42660 I I 257 RIO GUANAJIBO BASIN 50136400 RIO ROSARIO NEAR HORMIGUEROS, PR LOCATION.--Lat 18°09'36", long 67°05'08", at bridge on Highway 348, 0.5 mi (0.8 km) southwest of Rosario plaza. DRAINAGE AREA.--18.3 i' (47.4 km'). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--October 1985 to September 1986. GAGE.--Water-stage recorder. Elevation of gage is 50.0 ft (15.2 m), from topographic map. REMARKS.--Estimated daily discharges: Oct. 7-9 and April 27 to May 8. Records fair except those for estimated daily discharges, which are poor. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,500 ft'is (42.5 m'/s) and aximun (*): Discharge Gage height Discharge Gage height Date Time (W/s) (0/s) (ft) (m) Date Time (ftgs) (20/s) (ft) (m) Oct. 7 0715 *5,880 166 *12.67 3.862 June 15 1715 1,920 54.4 8.41 2.563 Oct. 19 1645 1,630 46.2 7.94 2.420 Minimum discharge, 8.7 ft'/s (0.246 m'/s), Apr. 15. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 77 118 32 21 18 12 11 17 49 31 110 33 2 64 102 31 22 16 11 10 19 43 29 59 29 3 76 96 30 22 19 11 13 130 39 28 45 62 4 60 135 30 21 23 12 32 160 37 28 49 34 5 53 206 30 20 18 11 18 190 35 29 39 27 6 208 126 30 20 16 11 12 66 33 30 35 23 7 1550 99 28 19 17 12 11 120 33 27 60 23 8 331 88 28 18 16 13 11 105 40 27 43 28 9 182 80 27 18 15 12 12 50 36 25 35 24 10 147 72 28 18 15 11 9.8 137 34 24 32 22 11 129 86 27 19 15 11 12 143 141 24 33 21 12 105 66 26 18 14 11 9.6 61 268 25 29 20 13 94 57 27 18 14 11 9.6 500 214 24 47 20 14 103 52 26 18 14 11 9.4 338 100 23 87 19 15 139 55 26 17 13 13 10 135 363 29 83 18 16 96 60 25 17 13 11 11 91 207 35 42 19 17 76 75 24 18 13 12 44 72 104 56 35 18 18 67 64 23 19 13 16 66 62 78 34 34 20 19 248 51 23 17 22 14 34 54 64 29 31 26 20 258 46 23 16 27 12 21 48 55 82 29 52 21 324 44 23 16 14 12 25 44 49 95 27 34 22 159 41 23 25 13 12 17 41 45 38 26 81 23 168 40 23 18 12 12 16 38 42 30 52 30 24 162 38 23 18 12 13 18 36 39 135 40 22 25 112 37 23 30 13 18 15 36 38 81 48 22 26 175 35 23 35 13 13 26 39 36 41 44 27 27 362 34 22 19 12 14 17 36 36 41 33 37 28 335 33 22 18 12 12 17 80 34 49 28 41 29 186 32 22 18 --- 12 23 132 32 37 29 80 30 189 31 23 23 12 18 118 31 137 29 68 31 157 --- 22 24 11 --- 63 --- 142 47 --- TOTAL 6392 2099 793 620 432 379 558.4 3071 2355 1465 1360 980 MEAN 206 70.0 25.6 20.0 15.4 12.2 18.6 99.1 78.5 47.3 43.9 32.7 MAX 1550 206 32 35 27 18 66 500 363 142 110 81 MIN 53 31 22 16 12 11 9.4 17 31 23 26 18 CFSM 11.3 3.83 1.40 1.09 .84 .67 1.02 5.42 4.29 2.58 2.40 1.79 IN. 12.99 4.27 1.61 1.26 .88 .77 1.14 6.24 4.79 2.98 2.76 1.99 AC-FT 12680 4160 1570 1230 857 752 1110 6090 4670 2910 2700 1940 WTR YR 1986 TOTAL 20504.4 MEAN 56.2 MAX 1550 MIN 9.4 CFSM 3.07 IN. 41.68 AC-FT 40670 258 RIO GUANAJIBO BASIN 50136400 RIO ROSARIO NEAR HORMIGUEROS, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS 1979 TO CURRENT YEAR. PERIOD OF DAILY RECORD.-- SUSPENDED-SEDIMENT DISCHARGE: OCTOBER 1985 TO SEPTEMBER 1986 INSTRUMENTATION.--USD-49 SEDINEMT SAMPLER SINCE OCTOBER 1985. 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. EXTREMES FOR CURRENT YEAR. -- SEDIMENT CONCENTRATIONS: Maximum daily mean, 8,150 mg/L October 7, 1985; Minimum daily mean, 2 mg/L several days. SEDIMENT LOADS: Maximum daily, 74,700 tons (67,800 tonnes) October 7, 1985; Minimum daily, 0.05 ton (0.04 tonne) several days. WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (NG/L) 100 ML) 100 ML) OCT 1985 02... 1815 51 245 8.00 25.0 10 <10 K1500 600 DEC 4... 1020 30 270 8.50 22.0 1.6 8.4 99 <10 K22 88 FEB 1986 5... 1145 18 281 8.40 22.5 2.0 16 K81 75 APR 8... 1400 10 278 8.80 26.0 1.5 11.0 137 17 68 430 JUL 9... 1435 26 260 8.10 28.5 1.2 8.8 114 <10 110 550 SEP 16... 1140 19 266 8.35 28.5 2.0 9.8 128 11 K150 90 HARD- ALKA- NESS MAGNE- SODIUM POTAS- UNITY CHLO- HARD- NONCARB CALCIUM SLUM, SODIUM, AD- SIUM, WATER SULFATE RIDE, NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1985 02... 110 7 20 15 6.5 0.3 1.5 105 <0.5 8.5 7.1 DEC 4... 111 FEB 1986 5... APR 8... 120 4 24 15 9.4 0.4 1.1 118 <0.5 7.7 9.3 JUL 9... 121 SEP 16... 120 0 23 16 8.3 0.3 1.5 130 6.9 7.7 K = non-ideal count RIO GUANAJIBO BASIN 50136400 RIO ROSARIO NEAR HORMIGUEROS, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1985 02... <0.10 28 150 21 3 0.690 0.010 0.700 0.030 0.27 DEC 4... 8 <0.010 0.800 0.010 0.19 FEB 1986 5... 3 <0.010 0.600 <0.010 APR 8... <0.10 31 170 4.6 4 <0.010 0.300 0.010 0.29 JUL 9... 6 <0.010 0.400 0.040 0.26 SEP 16... 0.10 29 170 8.9 2 <0.010 0.400 0.010 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA s NITRO- NITRO- PHOS- TOTAL TOTAL. TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1985 02... 0.30 1.0 4.4 0.030 <1 <100 10 <1 8 10 DEC 4... 0.20 1.0 4.4 0.040 FEB 1986 5... 0.40 1.0 4.4 0.040 APR 8... 0.30 0.60 2.7 0.040 <1 <100 30 <1 39 <10 JUL 9... 0.30 0.70 3.1 0.050 SEP 16... <0.20 0.050 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- N1UM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1985 02... 4 30 <0.10 <1 <1 40 <0.010 5 0.03 DEC 4... FEB 1986 5... APR 8... 120 1 10 <0.10 <1 <1 30 <0.010 <1 0.04 JUL 9... SEP 16... 259 260 RIO GUANAJIBO BASIN 50136400 RIO ROSARIO NEAR HORMIGUEROS, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT SED. SED. SED. SEDI- SUSP. SUSP. SUSP. MENT, FALL FALL FALL STREAM- SEDI- DIS- DIAM. DIAM. DIAM. FLOW, MENT, CHARGE, PERCENT PERCENT PERCENT INSTAN- SUS- SUS- FINER FINER FINER DATE TIME TANEOUS PENDED PENDED THAN THAN THAN (CFS) (MG/L) (T/DAY) .002 MM .004 MM .008 MM OCT 1985 06... 1830 689 2600 4840 24 34 53 20... 1710 958 2610 6750 19 32 43 21... 1620 1390 3320 12500 15 22 31 NOV 05... 1755 663 3940 7050 25 38 53 MAY 1986 13... 0728 1030 2720 7530 13 20 28 SED. SED. SED. SED. SED. SED. SED. SUSP. SUSP. SUSP. SUSP. SUSP. SUSP. SUSP. FALL FALL SIEVE SIEVE SIEVE SIEVE SIEVE DIAM. DIAM. DIAN. DIAM. DIAM. DIAM. DIAL 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 OCT 1985 06... 68 80 86 95 98 99 100 20... 62 75 85 95 98 99 100 21... 44 58 67 84 94 99 99 NOV 05... 69 87 91 96 99 100 100 MAY 1986 13... 41 56 63 78 87 92 96 261 RIO GUANAJIBO BASIN 50136400 RIO ROSARIO NEAR HORMIGUEROS, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) OCTOBER NOVEMBER DECEMBER 1 78 61 14 119 15 4.8 32 9 .78 2 66 40 6.9 102 13 3.6 31 9 .75 3 78 72 30 96 12 3.1 30 8 .65 4 62 35 7.2 135 193 178 30 9 .73 5 54 10 1.4 206 572 1290 30 9 .73 6 209 608 1440 126 70 27 30 9 .73 7 1550 8150 74700 99 15 4.0 28 7 .53 8 330 270 300 88 10 2.4 28 7 .53 9 185 30 15 80 10 2.2 27 6 .44 10 148 39 20 72 10 1.9 28 6 .45 11 131 65 29 86 75 43 27 6 .44 12 107 15 4.3 66 12 2.1 26 5 .35 13 97 54 46 57 10 1.5 27 5 .36 14 103 90 36 51 10 1.4 26 5 .35 15 140 241 226 55 10 1.5 26 5 .35 16 98 63 18 60 12 1.9 25 5 .34 17 78 18 3.8 75 41 11 24 4 .26 18 69 15 2.7 64 17 2.9 23 4 .25 19 247 1030 4100 51 10 1.4 23 4 .25 20 258 553 995 46 10 1.2 23 4 .25 21 324 949 2380 43 10 1.2 22 4 .25 22 160 110 59 41 10 1.1 22 5 .31 23 170 247 234 40 10 1.1 22 5 .31 24 162 89 48 38 10 1.0 22 5 .30 25 113 30 9 1 37 10 1.0 22 5 .31 26 176 330 521 35 9 .85 22 5 .31 27 362 933 2230 34 9 .83 22 5 .30 28 334 766 1610 33 9 .80 21 5 .30 29 186 42 24 32 9 .78 22 4 .24 30 190 68 71 31 9 .75 22 4 .24 31 157 30 13 --- --- --- 22 4 .24 TOTAL 6422 89194.4 2098 1594.31 785 12.63 262 RIO GUANAJIBO BASIN 50136400 RIO ROSARIO NEAR HORMIGUEROS, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY). WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISNARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) JANUARY FEBRUARY MARCH 1 21 4 .23 17 3 .15 11 2 .06 2 22 4 .24 16 3 .13 11 2 .06 3 21 4 .24 19 3 .15 11 2 .06 4 21 4 .23 23 5 .31 12 2 .06 5 20 3 .16 17 3 .15 11 2 .06 6 19 3 .16 16 3 .13 11 2 .06 7 19 3 .15 17 3 .14 12 2 .06 8 18 3 .15 16 3 .13 13 2 .07 9 18 3 .15 15 2 .08 12 2 .06 10 18 3 .15 15 2 .08 11 2 .06 11 18 3 .15 15 2 .08 11 2 .06 12 17 3 .15 14 2 .08 11 2 .06 13 18 3 .15 14 2 .08 11 2 .06 14 17 3 .15 14 2 .08 11 2 .06 15 17 3 .14 13 2 .07 13 3 .11 16 17 3 .14 13 2 .07 11 2 .06 17 18 3 .15 13 2 .07 12 3 .10 18 18 3 .15 13 2 .07 16 4 .17 19 17 3 .14 22 13 2.3 14 3 .11 20 16 3 .13 27 11 .98 12 3 .10 21 16 3 .13 14 3 .11 12 3 .10 22 24 10 .83 13 3 .11 12 3 .10 23 17 3 .15 12 3 .10 11 3 .10 24 17 3 .15 12 3 .10 12 4 .14 25 30 17 3.5 13 3 .11 18 6 .29 26 35 16 2.9 13 3 .11 13 3 .11 27 18 4 .21 12 2 .06 14 4 .15 28 18 3 .15 12 2 .06 12 2 .06 29 18 3 .15 --- --- 11 2 .06 30 23 5 .31 11 2 .06 31 23 5 .32 11 2 .06 TOTAL 609 12.11 430 6.09 374 2.73 263 RIO GUANAJIBO BASIN 50136400 RIO ROSARIO NEAR HORMIGUEROS, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) JULY AUGUST SEPTEMBER 1 32 7 .59 110 116 43 33 18 1.6 2 30 5 .39 59 32 5.1 29 10 .78 3 29 7 .53 45 12 1.5 62 51 18 4 28 7 .53 49 41 9.6 35 22 2.0 5 29 8 .63 39 17 1.8 28 7 .51 6 31 10 .81 35 12 1.1 24 7 .43 7 28 6 .44 60 55 15 23 7 .43 8 28 6 .44 43 15 1.7 29 9 1.0 9 26 5 .34 35 10 .95 24 10 .65 10 24 5 .32 32 10 .86 22 10 .59 11 24 5 .32 33 10 .89 21 9 .51 12 24 5 .32 29 9 .70 20 8 .43 13 24 5 .32 47 33 7.7 20 8 .43 14 23 5 .31 87 151 128 19 7 .36 15 29 9 .83 82 88 35 19 6 .29 16 36 22 4.0 42 20 2.3 19 6 .29 17 56 44 9.9 35 12 1.1 18 6 .31 18 34 15 1.4 34 10 .92 21 6 .29 19 29 10 .78 31 10 .84 26 9 1.0 20 90 122 100 30 9 .70 53 44 12 21 95 93 35 27 8 .58 35 10 .92 22 38 20 2.1 26 8 .56 82 104 76 23 30 15 1.2 50 46 20 31 15 1.2 24 135 279 464 40 30 3.2 22 10 .59 25 82 46 15 48 42 13 22 10 .59 26 41 10 1.1 44 35 4.2 27 9 .85 27 41 10 1.1 33 12 1.1 37 23 5.1 28 49 10 1.3 28 10 .76 41 27 4.1 29 37 10 1.0 29 10 .78 80 126 112 30 137 241 300 29 10 .78 68 45 8.0 31 143 197 94 47 40 10 --- --- --- TOTAL 1482 1039.00 1358 313.72 990 251.25 264 RIO GUANAJIBO BASIN 50136400 RIO ROSARIO NEAR HORMIGUEROS, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (.FS) (MG/L) (TONS/DAY) APRIL MAY JUNE 1 11 2 .06 17 10 .54 54 10 1.3 2 10 2 .05 19 482 755 47 8 .93 3 13 3 .14 130 609 1030 44 8 .84 4 32 25 2.7 160 514 1170 41 8 .80 5 17 9 .44 100 184 95 38 7 .66 6 12 5 .16 66 475 938 35 7 .62 7 11 4 .12 120 688 1790 36 7 .62 8 11 3 .09 105 128 52 43 10 1.1 9 12 4 .13 50 40 5.4 38 9 .87 10 9.8 2 .05 136 190 130 36 8 .73 11 11 3 .10 142 174 86 141 215 213 12 9.5 2 .05 60 40 6.6 271 900 2170 13 9.5 2 .05 499 1440 3620 215 338 304 14 9.3 2 .05 342 711 1080 102 98 31 15 9.9 2 .05 150 28 10 362 1100 3570 16 11 3 .09 104 18 4.4 208 320 224 17 44 57 45 84 16 3.1 105 50 14 18 66 90 30 73 11 1.8 79 23 4.8 19 34 35 3.2 65 10 1.5 65 12 2.1 20 21 30 1.7 57 10 1.3 56 10 1.5 21 24 30 2.0 52 10 1.2 50 9 1.2 22 17 25 1.1 49 10 1.1 46 8 .97 23 16 22 .95 46 9 .92 43 8 .91 24 18 25 1.2 43 8 .78 40 7 .74 25 15 22 .89 42 8 .78 39 7 .72 26 25 20 1.4 45 9 .95 37 7 .68 27 17 15 .69 42 8 .78 37 7 .68 28 17 10 .54 87 95 59 35 5 .46 29 23 10 .54 139 175 105 33 5 .43 30 18 10 .54 127 99 37 32 5 .42 31 --- --- --- 70 15 2.6 --- --- --- TOTAL 554.0 94.08 3221 10990.75 2408 6550.08 I I I 265 RIO GUANAJIBO BASIN 50138000 RIO GUANAJIBO NEAR HORMIGUEROS, PR LOCATION.--Lat 18°08'36', long 67'08'57', Hydrologic Unit 21010003, at bridge on Highway 100, 1.4 i (2.3 k•) west of Hor•igueros, and 2.0 •i (3.2 km) downstream from Rio Rosario. DRAINAGE AREA.--120 •i 2 (311 km2). 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 i (0.5 km) upstream at datum 7.36 ft (2,243 m) higher. REMARKS.--Estimated daily discharges: Oct. 7-22, Nov. 29 to Dec. 9, Dec. 22 to Jan. 7, Feb. 1, 2, Aug. 13, 14 and June 17 to July 14. Records fair except those for estimated daily discharges, which are poor. AVERAGE DISCHARGE.--13 years (1974-86), 218 ft'/s (6.174 m'/s), 24.67 in/yr (627 mm/yr), 157.900 acre-ft/yr (195 hmYyr); median of yearly mean discharges, 210 ft'is (5.95 m'/s), 152,000 acre-ft/yr (187 hmYyr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 128,000 ft'/s (3,620 m'/s), Sept. 16, 1975, gage height, 28.50 ft (8.687 •), site and datum then in use, fro rating curve extended above 100 ft'is (2.83 m'./s) on the basis of contracted-opening measurement of peak flow; minimum discharge, 4.6 ft'is (0.130 •'/s), June 22, 1977. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 2,000 ft'is (56.6 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (W/s) (•'/s) (ft) (m) Date Time (W/s) (•'/s) (ft) (m) Oct. 7 unknown *40,000 1,133 *28.00 8.534 May 14 0630 7,680 217 22.89 6.977 Minimum discharge. 5.0 ft'is (0.142 m'/s), Apr. 3, 15-17. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 167 643 110 47 60 18 9.8 345 186 66 391 182 2 134 498 105 49 55 16 8.7 254 155 60 180 177 3 119 421 100 48 47 17 30 400 143 60 144 140 4 159 672 98 45 52 24 91 324 130 62 207 140 5 152 716 96 43 47 20 63 279 117 85 201 101 6 624 507 94 41 38 17 45 299 105 66 117 86 7 5000 464 92 41 35 17 34 490 96 59 129 77 8 10000 377 90 40 32 21 28 312 90 55 163 68 9 2000 310 90 39 31 22 29 188 89 52 118 68 10 1150 281 87 39 29 18 22 548 76 50 103 74 11 800 324 83 38 28 17 18 968 286 48 90 83 12 630 287 81 36 27 16 15 351 375 43 80 59 13 530 326 79 36 26 22 12 2720 640 43 74 55 14 600 253 79 36 26 38 8.7 4890 208 42 86 49 15 840 214 81 35 26 27 8.2 1490 466 54 301 48 16 540 216 79 35 25 22 10 622 679 65 123 47 17 420 244 79 36 27 19 8.3 412 197 71 94 47 18 390 266 77 35 27 30 93 297 149 88 82 47 19 1750 217 75 32 24 27 59 229 127 50 73 53 20 1700 189 74 30 51 28 24 196 115 60 71 196 21 2050 172 72 30 30 23 26 164 100 237 65 169 22 800 159 70 38 27 18 19 156 91 80 64 138 23 24 578 1090 151 169 65 66 32 32 24 22 17 17 10 12 151 143 86 81 57 383 162 196 97 71 25 571 144 62 33 23 26 11 134 78 310 134 60 26 501 137 58 66 21 21 28 133 74 125 154 171 27 1140 131 54 45 22 19 22 143 71 93 96 196 28 1380 125 54 39 19 15 19 173 67 95 77 218 29 874 120 52 42 --- 12 268 391 66 80 110 160 30 1000 115 52 47 12 392 722 62 182 87 186 31 1170 --- 47 67 9 9 --- 250 --- 385 106 --- TOTAL 38859 8848 2401 1252 901 625.9 1423.7 18174 5205 3206 4078 3263 MEAN 1254 295 77.5 40,4 32.2 20.2 47.5 586 174 103 132 109 MAX 10000 716 110 67 60 38 392 4890 679 385 391 218 MIN 119 115 47 30 19 9.9 8.2 133 62 42 64 47 CFSM 10.4 2.46 .65 .34 .27 .17 .40 4.88 1.45 .86 1.10 .91 IN. 12.05 2.74 .74 .39 .28 .19 .44 5.63 1.61 .99 1.26 1.01 AC-FT 77080 17550 4760 ?480 1790 1240 2820 36050 10320 6360 8090 6470 CAL YR 1985 TOTAL 87887 MEAN 241 MAX 10000 MIN 20 CFSM 2.01 IN. 27.24 AC-FT 174300 WTR YR 1986 TOTAL 88236.6 MEAN 242 MAX 10000 MIN 8.2 CFSM 2.02 IN. 27.35 AC-FT 175000 266 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 1985 TO SEPTEMBER 1986 OXYGtN, OXYGEN COLT- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER ITV SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1985 02... 1315 133 368 8.10 26.0 15 <10 K7000 K1100 DEC 5... 1230 94 484 7.80 24.0 11 6.8 <10 31000 4700 FEB 1986 6... 1445 39 564 7.80 26.0 10 6.2 36 35000 4000 APR 09... 1300 31 521 8.00 27.0 16 5.9 75 18 28000 K800 JUL 10... 0915 51 424 7.85 27.0 1.7 6.5 82 <10 K61000 3500 SEP 16... 1615 46 440 7.90 29.0 8.5 5.4 71 20 57000 8200 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- HARD- NONCARB CALCIUM SLUM, SODIUM, AD- SIUM, WATER SULFATE RIDE, NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1985 02... 180 24 27 28 12 0.4 1.8 159 <0.5 17 13 DEC 05... 189 FEB 1986 06... 197 APR 9... 230 32 31 36 20 0.6 2.3 194 <0.5 40 22 JUL 10... 190 SEP 16... 200 4 31 30 16 0.5 2.1 197 18 17 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1985 02... 0.20 32 230 81 11 0.760 0.040 0.800 0.230 0.37 DEC 05... 34 0.770 0.030 0.800 0.140 0.36 FEB 1986 06... 12 0.860 0.040 0.900 0.320 0.58 APR 9... 0.40 34 300 25 23 0.750 0.050 0.800 0.290 0.51 JUL 10... 11 <0.010 0.500 0.010 0.19 SEP 16... 0.20 33 270 33 12 0.630 0.070 0.700 0.410 0.09 K = non-ideal count RIO GUANAJIBO BASIN 50138000 RIO GUANAJIBO NEAR HORMIGUEROS, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L •(UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1985 02... 0.60 1.4 6.2 0.340 <1 <100 20 1 22 10 DEC 5... 0.E0 1.3 5.8 0.360 FEB 1986 6... 0.90 1.8 8.0 0.490 APR 9... 0.80 1.6 7.1 0.550 2 <100 140 <1 21 <10 JUL 10... 0.20 0.70 3.1 0.040 SEP 16... 0.50 1.2 5.3 0.460 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1985 02... 1600 2 120 <0.10 <1 <1 10 <0.010 <1 0.04 DEC 5... FEB 1986 6... APR 9... 1100 3 140 <0.10 <1 <1 10 <0.010 <1 0.07 JUL 10... SEP 16... PESTICIDE ANALYSES CHLOR- DI- DI- PCB, ALDRIN, DANE, DOD, DDE, DDT, AZINON, ELDRIN DATE 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) JUL 1986 10... 0915 <0.1 <0.010 <0.1 <0.010 <0.010 <0.010 0.07 <0.010 HEPTA- METH- ENDO- HEPTA- CHLOR MALA- OXY- SULFAN, ENDRIN, ETHION, CHLOR, EPDXIDE LINDANE THION, CHLOR, DATE TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUL 1986 10... <0.010 <0.010 <0.01 <0.010 <0.010 <0.010 <0.01 <0.01 NAPH- THA- METHYL METHYL LENES, PARA- TRI- PARA- POLY- PER- TOX- TOTAL THION, THION, MIREX, THION, CHLOR. THANE APHENE, TRI- DATE TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL THION (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUL 1986 10... <0.01 <0.01 <0.01 <0.01 <0.10 <0.1 <1 <0.01 267 Drainage boundary Rio Cuiebrinos basin GLARES A ASCO Anasco Rio Grand Cyuaiatoca eosin 1.0 1460 Rip Comuy basin LAS MAMA R(0 Tacoma" basin MAYAGUEZ MAR ICAO . Coastot basin ." Rio Guanojib0 basin Drainage boundary-, land de EXPLANATION At440 SURFACE—WATER STATION AND NUMBER V1388 QUALITY—OF—WATER STATION AND NUMBER Map area-, CASUAS. BUAYA M Figure 24.--Rio YagUez and Rio Grande de Afiasco basins 270 RIO YAGUEZ BASIN 50138800 RIO YAGUEZ NEAR MAYAGUEZ, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°12'31", long 67°07'07", at steel-truss bridge on unnumbered paved road about 800 ft (244 m) south of Highway 106, 1.8 mi (2.9 km) west of Highways 106 and 352 junction, and 1.4 mi (2.3 km) east-northeast from Mayaguez plaza. DRAINAGE AREA.--6.7 sq mi (17.3 sq km). PERIOD OF RECORD.--Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1985 01... 1225 10 263 8.20 24.5 6.0 8.5 19 K700 810 DEC 06... 0730 8.8 297 8.20 21.0 0.80 8.6 <10 K36 440 FEB 1986 05... 1420 5.3 282 8.40 24.5 14 10.0 46 59000 87000 MAY 02... 0810 11 162 7.80 22.5 670 8.5 99 28 59000 87000 JUL 11... 0815 5.3 303 8.00 24.5 1.5 8.4 101 13 K620 620 SEP 17... 0755 6.1 306 7.95 23.0 1.5 8.6 101 17 290 2900 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- HARD- NONCARB CALCIUM SIUM, SODIUM, AD- SLUM, WATER SULFATE RIDE, NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1985 01... 120 5 30 10 9.7 0.4 2.3 111 <0.5 7.7 7.3 DEC 06... 120 FEB 1986 05... 110 MAY 02... 63 0 16 5.6 6.9 0.4 2.0 67 <0.5 9.1 8.6 JUL 11... 138 SEP 17... 130 0 37 10 11 0.4 2.1 139 7.8 9.4 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOIAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) 5102) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1985 1... <0.10 29 160 4.4 2 0.790 0.010 0.800 0.020 0.18 DEC 06... 4 <0.010 0.900 0.010 FEB 1986 05... 10 <0.010 0.300 0.010 0.39 MAY 2... <0.10 19 110 3.1 672 0.730 0.070 0.800 0.160 0.44 JUL 11... 3 0.620 0.080 0.700 0.390 0.41 SEP 17... <0.10 30 190 3.1 3 <0.010 0.600 0.040 K = non-ideal count 271 RIO YAGUEZ BASIN 50138800 RIO YAGUEZ NEAR MAYAGUEZ, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1985 01... 0.20 1.0 4.4 0.030 <1 100 <10 1 3 <10 DEC 06... <0.20 0.040 FEB 1986 05... 0.40 1.2 5.3 0.050 -- MAY 02... 0.60 1.4 6.2 0.160 <1 200 20 <1 23 50 JUL 11... 0.80 1.5 6.6 0.400 SEP 17... <0.20 0.040 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1985 01... 380 <1 20 <0.10 <1 <1 10 <0.010 2 0.03 DEC 06... FEB 1986 05... MAY 02... 28000 4 580 <0.10 <1 <1 50 <0.010 <1 0.09 JUL 11... SEP 17... RIO GRANDE DE ANASCO BASIN 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 sq mi (68.1 sq km) this does not include 36.2 sq mi (93.8 sr km) which contributes only dur- ing high floods, and 3.5 sq mi (9.1 sq 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 1985 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLT- STREP- SPE- DIS- DEMANC, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1985 31... 1030 890 175 7.80 23.5 61 8.2 25 K1700 4900 DEC 11... 1225 50 291 8.20 24.5 1.7 9.4 11 270 56 FEB 1986 11... 1215 28 312 8.45 23.0 71 8.7 103 21 120 500 MAY 01... 1430 212 224 7.81 25.0 33 8.2 100 63 4800 20000 JUL 10... 1200 34 268 7.90 29.0 750 7.3 95 61 1200 2000 SEP 11... 1200 35 293 7.51 29.0 630 7.4 98 25 K2700 1800 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- HARD- NONCARB CALCIUM SIUM, SODIUM, AD- SLUM, WATER SULFATE RIDE, NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L TOT FLU SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1985 31... 70 6 18 6.0 8.0 0.4 1.8 64 <0.5 10 7.3 DEC 11... 114 FEB 1986 11... 121 MAY 01... 82 7 23 5.9 9.1 0.5 2.4 75 <0.5 14 8.2 JUL 10... 105 SEP 11... 100 8 27 8.2 13 0.6 2.5 93 18 12 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2iNO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1985 31... <0.10 20 110 263 51 1.18 0.020 1.20 0.050 0.55 DEC 11... 1 1.29 0.010 1.30 0.030 0.27 FEB 1986 11... 126 1.13 0.070 1.20 0.030 0.37 MAY 01... <0.10 22 130 74 504 1.65 0.050 1.70 0.260 0.44 JUL 10... 824 1.12 0.380 1.50 1.10 1.0 SEP 11... 0.20 28 160 16 1130 2.34 0.360 2.70 1.180 1.0 K = non-ideal count 272 273 RIO GRANDE DE ABASCO BASIN 50143000 RIO GRANDE DE ABASCO NEAR LARES, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1985 31... 0.60 1.8 8.0 0.060 <1 <100 10 1 16 50 DEC 11... G.30 1.6 7.1 0.040 FEB 1986 11... 0.40 1.6 7.1 0.040 MAY 01... 0.70 2.4 11 0.150 1 200 40 1 26 70 JUL 10... 2.1 3.6 16 0.340 SEP 11... 1.2 3.9 17 0.530 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1985 31... 4900 40 150 0.10 <1 <1 30 <0.010 <1 0.05 DEC 11... FEB 1986 11... MAY 01... 29000 5 820 0.20 <1 <1 70 <0.010 <1 0.09 JUL 10... SEP 11... I I I I I I I I I I I 274 RIO GRANDE DE ANASCO BASIN 50144000 RIO GRANDE DE ANASCO NEAR SAN SEBASTIAN, PR LOCATION.--Lat 18°17'05", long 67°03'05", Hydrologic Unit 21010003, on right bank, at downstream side of bridge on Highway 108, 0.4 i (0.6 km) downstream from Quebrada La Zumbadora, 4.4 i (7.1 km) northwest of Las Marias, 5.4 i (8.7 km) southwest of San Sebastian. DRAINAGE AREA.--94.3 mil (244.2 km2), does not include 36.2 i 2 (93.8 km') which contributes only during high floods, and 3.5 i 2 (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, a site 600 ft (180 m) upstream at same datum. REMARKS.--Estimated daily discharges: Oct. 7. 8. Records fair except those for estimated daily discharges, which are poor. Transbasin diversion (except during floods) to Rio Yauco basin for hydroelectric power and irrigation above Lago Guayo, Yahuecas, and Prieto, combined usable storage 17,300 acre-ft (21.3 hm'). Limited storm runoff is contributed to basin by 3.5 mil (9.1 km2) above Rio Toro Diversion dam. AVERAGE DISCHARGE.--23 years (1964-86), 313 ft'is (8.864 '/s), 45.08 in/yr (1,145 m/yr), 226,800 acre-ft/yr (280 hiP/yr); median of yearly mean discharges, 303 ft'/s (8.581 m'/s), 220,000 acre-ft/yr (271 hiP/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 140,000 ft'/s (3,960 10/s), Sept. 16, 1975, gage height, 33.9 ft (10.33 ), fro rating curve extended above 4,000 ft'is (113 '/s) on basis of slope-area measurement; minimum discharge, 31 ft'is (0.878 '/s), Apr. 19, 20, 1965. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 6,000 ft'A (170 m 3/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (W/s) (10/s) (ft) (m) Date Time (ft'/s) (e/s) (ft) (m) Oct. 6 2115 8,630 244 8.68 2.646 Nov. 4 1800 10,400 294 9.50 2.896 Oct. 7 0500 *53,600 1,518 *21.94 6.687 Apr. 30 2015 9,090 257 8.90 2.713 Oct. 26 2230 6,590 187 7.60 2.316 May 1 1915 13,800 306 9.71 2.960 Oct. 28 1715 7,880 223 8.30 2.530 May 13 2330 11,400 323 9.96 3.036 Minimum discharge, 42 ft'is (1.189 m 3/s), Apr. 15, 16. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 DAY OCT NOV DEC JAN MEAN FEB VALUES MAR APR MAY JUN JUL AUG SEP 1 2 3 4 5 599 328 230 210 180 851 743 952 1570 759 227 221 215 211 206 147 153 140 139 135 116 107 151 237 154 73 66 74 115 79 56 56 106 331 171 2680 1410 1180 1210 1160 259 229 217 201 192 208 204 200 203 167 473 370 260 324 427 398 554 497 315 226 6 7 8 9 10 1300 4400 2500 1650 967 520 446 394 359 335 205 197 189 187 188 128 127 127 150 158 123 114 119 109 107 72 69 81 72 63 132 87 90 103 82 1480 1770 1220 1010 1310 18? 382 359 285 680 177 243 291 252 179 558 836 727 567 406 196 175 198 195 176 11 12 13 14 15 1170 840 1050 769 1520 317 299 286 284 317 183 179 180 173 171 130 123 122 117 114 103 95 97 97 96 89 71 70 68 70 74 62 56 50 45 1350 784 4170 3920 1360 442 443 600 329 726 199 175 147 240 235 341 376 475 408 450 169 173 154 138 153 16 17 18 19 20 733 424 336 506 727 440 587 658 372 309 172 172 169 164 161 111 107 111 104 100 86 84 95 106 104 59 59 172 148 93 58 153 314 269 116 974 759 652 578 496 550 326 476 427 278 573 570 476 342 459 319 390 305 281 270 172 278 325 156 140 21 22 23 24 25 703 516 619 1260 919 287 272 266 262 260 158 156 157 154 148 96 113 100 139 112 120 91 79 80 99 74 65 56 56 101 304 115 91 175 112 396 339 286 261 283 267 244 234 224 215 516 264 214 335 297 243 233 250 312 362 144 195 180 145 153 26 27 28 29 30 31 1300 2370 2290 1270 998 1160 252 248 244 237 232 --- 148 147 146 146 147 144 160 127 112 108 197 207 85 84 80 --- 90 73 68 64 72 59 238 120 102 791 1780 --- 315 625 445 464 438 293 229 563 254 224 215 --- 472 331 299 343 605 584 418 257 233 235 340 256 140 132 420 129 99 --- TOTAL MEAN MAX MIN CFSM IN. AC-FT 33844 1092 4400 180 11.6 13.35 67130 13358 445 1570 232 4.72 5.27 26500 5421 175 227 144 1.86 2.14 10750 4014 129 207 96 1.37 1.58 7960 3018 108 237 79 1.15 1.19 5990 2441 78.7 172 56 .83 .96 4840 1 6239 208 1780 45 2.21 2.46 2380 33618 1084 4170 261 11.5 13.26 66680 10252 342 726 182 3.63 4.04 20330 9800 316 605 147 3.35 3.87 19440 11702 377 836 233 4.00 4.62 23210 6525 218 554 99 2.31 2.57 12940 CAL YR 1985 WTR YR 1986 TOTAL TOTAL 131791 140232 MEAN MEAN 361 384 MAX MAX 19100 4400 MIN MIN 65 45 CFSM CFSM 3.83 4.07 IN. IN. 51.99 55.32 AC-FT AC-FT 261400 278200 275 RIO GRANDE DE ANASCO BASIN 50144000 RIO GRANDE DE ANASCO NEAR SAN SEBASTIAN, PR--Continued (National stream-quality accounting network station) WATER-QUALITY RECORDS PERIOD OF RECORD.--Water years 1963 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 COLI- STREP- HARD- SPE- FORM, TOCOCCI NESS STREAM- CIFIC FECAL, FECAL, HARD- NONCARB FLOW, CON- PH TEMPER- TUR- OXYGEN, 0.7 KF AGAR NESS WATER :NSTAN- DUCT- (STAND- ATURE BID- DIS- UM-MF (COLS. (MG/L TOT FLD DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED (COLS./ PER AS MG/L AS (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) 100 ML) 100 ML) CAC03) CAC03 OCT 1985 02... 1040 270 209 8.00 24.0 57 8.9 K15000 6000 93 JAN 1986 09... 1140 124 250 8.20 22.0 1.3 9.7 110 3 APR 11... 1300 84 273 7.56 28.0 20 8.5 140 110 17 JUL 02... 1115 206 235 7.91 27.0 130 8.1 260 220 100 2 ALKA- SOLIDS, MAGNE- SODIUM POTAS- LINITY CHLO- FLUO- SILICA, RESIDUE CALCIUM SIUM, SODIUM, AD- SIUM, WATER SULFATE RIDE, RIDE, DIS- AT 180 DIS- DIS- DIS- SORP- DIS- TOTAL DIS- DIS- DIS- SOLVED DEG. C SOLVED SOLVED SOLVED TION SOLVED FIELD SOLVED SOLVED SOLVED (MG/L DIS- DATE (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L AS SOLVED AS CA) AS MG) AS NA) AS K) CAC03 AS SO4) AS CL) AS F) SI02) (MG/L) OCT 1985 02... 24 8.0 7.7 0.4 3.8 87 9.5 5.9 <0.10 26 128 JAN 1986 09... 28 9.6 10 0.4 1.4 107 10 8.5 0.10 30 154 APR 11... 29 9.4 10 0.4 1.8 94 13 7.9 0.10 29 162 JUL 02... 26 9.0 11 0.5 1.6 100 10 7.9 0.10 31 156 SOLIDS, NITRO- NITRO- NITRO- NITRO- PHOS- PHOS- SUM OF SOLIDS, GEN, GEN, GEN, GEN,AM- PHOS- PHORUS, PRATE, CONSTI- DIS- NO2+NO3 AMMONIA AMMONIA MONIA PHOS- PHORUS, ORTHO, ORTHO, TUENTS, SOLVED DIS- 01S- DIS- ORGANIC PHORUS, DIS- DIS- DIS- DIS- (TONS SOLVED SOLVED SOLVED TOTAL TOTAL SOLVED SOLVED SOLVED DATE SOLVED PER (MG/L (MG/L (MC/L (MG/L (MG/L (MG/1 (MG/L (MG/L (MG/L) DAY) AS N) AS N) AS NH4) AS N) AS P) AS P) AS P) AS PO4) OCT 1985 02... 140 93 0.800 0.040 0.05 0.60 0.100 0.050 0.030 0.09 JAN 1986 09... 160 52 0.730 0.030 0.04 0.30 0.040 0.040 0.040 0.12 APR 11... 160 37 0.670 0.100 0.13 0.30 0.060 0.040 0.030 0.09 JUL 02... 160 87 0.860 0.210 0.27 0.50 0.100 0.040 0.040 0.12 ALUM- BERYL- CHRO- INUM, ARSENIC BARIUM, LIUM, CADMIUM M1UM, COBALT, COPPER, IRON, LEAD, DIS- DIS- D1S- DIS- DIS- DIS- DIS- DIS- DIS- DIS- SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS AL) AS AS) AS BA) AS BE) AS CD) AS CR) AS CO) AS CU) AS FE) AS PB) OCT 1985 02... 40 <1 42 <0.5 <1 <1 <3 2 33 <1 JAN 1986 09... <10 <1 39 <0.5 <1 <1 <3 1 6 <1 APR 11... 40 <1 37 <0.5 1 <1 <3 8 50 2 JUL 02... 40 <1 36 0.7 <1 <1 <3 3 20 <5 K = non-ideal count 276 RIO GRANDE DE ANASCO BASIN 50144000 RIO GRANDE DE ANASCO NEAR SAN SEBASTIAN, PR--Continued (National stream-quality accounting network station) WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MANGA- MOLYB- SELE- STRON- VANA- LITHIUM NESE, MERCURY DENUM, NICKEL, NIUM, SILVER, TIUM, DIUM, ZINC, DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS LI) AS MN) AS HG) AS MO) AS NI) AS SE) AS AG) AS SR) AS V) AS ZN) OCT 1985 02... <4 33 <0.1 <10 2 <1 <1 120 <6 9 JAN 1986 09... <4 12 <0.1 <10 <1 <1 <1 150 <6 <3 APR 11... 1 18 0.1 <10 1 <1 <1 140 9 31 JUL 02... <4 10 0.2 (10 2 <1 <1 140 9 6 PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT SFDI- MENT, SUSP. STREAM- SEDI- DIS- SIEVE FLOW, MENT, CHARGE, DIAM. INSTAN- SUS- SUS- 6 FINER DATE TIME TANEOUS PENDED PENDED THAN (CFS) (MG/L) (T/DAY) .062 MM OCT 1985 02... 1022 266 114 82 97 JAN 1986 09... 1140 124 36 12 88 APR 11... 1300 85 70 16 99 RIO GRANDE DE ANASCO BASIN 50146000 RIO GRANDE DE ANASCO NEAR ANASCO, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°16'00", long 67°08'05", at bridge on Highway 430, 0.2 mi (0.3 km) south of Highway 109 at El Espino and 1.4 mi (2.3 km) east-southeast from Atiasco plaza. DRAINAGE AREA.--139 sq mi (360 sq km) this does not include 39.7 sq mi (102.8 sq km), flow is diverted to south coast. PERIOD OF RECORD.--Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLT- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1985 03... 1000 333 196 7.60 25.0 58 8.6 <10 2500 4300 DEC 10... 1610 235 246 7.80 26.5 3.0 9.0 <10 220 K100 FEB 1986 10... 1800 114 254 8.00 25.5 30 8.1 100 37 K110 340 APR 30... 1530 170 7.08 24.5 740 8.0 94 26000 62000 JUL 9... 1430 291 291 7.40 28.5 300 7.3 93 29 15700 28000 SEP 10... 1425 243 259 7.68 30.0 46 7.8 104 <10 340 K130 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- HARD- NONCARB CALCIUM SIUM, SODIUM, AD- SIUM, WATER SULFATE RIDE, NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1985 03... 80 0 19 7.8 7.6 0.4 1.7 81 <0.5 9.3 6.0 DEC 10... 105 FEB 1986 10... 103 APR 30... 68 15 19 5.1 6.5 0.4 2.2 53 <0.5 15 6.7 JUL 9... 72 SEP 10... 98 0 25 8.6 10 0.5 2.0 98 8.2 7.0 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS' SUS- TOTAL TOTAL. TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) S102) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1985 03... <0.10 27 130 114 69 0.680 0.020 0.700 0.070 0.43 DEC 10... 10 0.790 0.010 0.800 0.040 0.36 FEB 1986 10... 32 0.780 0.020 0.800 0.030 0.27 APR 30... <0.10 17 100 0.0 1160 1.12 0.080 1.20 0.230 2.5 JUL 9... 487 0.920 0.080 1.00 0.140 0.46 SEP 10... 0.10 32 150 100 1 0.890 0.010 0.900 0.060 0.14 K = non-ideal count 277 RIO GRANDE DE ANASCO BASIN 50146000 RIO GRANDE DE ANASCO NEAR ANASCO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RZCOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1985 03... 0.50 1.2 5.3 0.100 <1 <100 40 <1 12 20 DEC 10... 0.40 1.2 5.3 0.040 FEB 1986 10... 0.30 1.1 4.9 0.040 APR 30... 2.7 3.9 17 0.450 1 300 40 1 21 120 JUL 9... 0.60 1.6 7.1 0.070 SEP 10... 0.20 1.1 4.9 0.070 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1985 03... 4100 5 170 <0.10 <1 <1 20 <0.010 4 0.03 DEC 10... FEB 1986 10... -- APR 30... 50000 11 1700 0.20 1 <1 190 <0.010 <1 0.09 JUL 09... SEP 10... -- PESTICIDE ANALYSES CHLOR- DI- DI- PCB, ALDRIN, DANE, DOD, ODE, DDT, AZINON, ELDRIN DATE 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) JUL 1986 09... 1430 <0.1 <0.010 <0.1 <0.010 <0.010 <0.010 0.01 <0.010 HEPTA- METH- ENDO- HEPTA- CHLOR MALA- OXY- SULFAN, ENDRIN, ETHION, CHLOR, EPDXIDE LINDANE THION, CHLOR, DATE TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUL 1986 09... <0.010 <0.010 <0.01 <0.010 <0.010 <0.010 <0.01 <0.01 NAPH- THA- METHYL METHYL LENES, PARA- TRI- PARA- POLY- PER- TOX- TOTAL THION, THION, MIREX, THION, CHLOR. THANE APHENE, 1RI- DATE TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL THION (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUL 1986 09... <0.01 <0.01 <0.01 <0.01 <0.10 <0.1 <1 <0.01 278 AGUADILLA N Drainage boundary uncertain Ago ///Pb MOCA • Rib Guayabo RINCON • ASTIAL:Th • Rio Guajataca basin Coastal basin •••"\--•••" Coastal basin •• Rio Grande de Arloscobasin inos 46/­ LARES • /Drainage boundary \\. EXPLANATION A1478 SURFACE—WATER STATION AND NUMBER -1476 QUALITY—OF—WATER STATION AND NUMBER • 83 WELL AND WELL NUMBER Map area AGUADILLA •ARECIBO .111AYAGUEZ O 1I 2I 3 4 KILOMETERS O 1 2 3 4 MILES Figure 25.--Rio Culebrinas basin. 280 RIO CULEBRINAS BASIN 50147600 RIO CULEBRINAS NEAR SAN SEBASTIAN, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°20'51", long 67°02'40", at bridge on Highway 423, 1.3 mi (2.1 km) south of Quebrada El Salto Bridge on Highway 111, and 2.1 mi (3.4 km) west of Central La Plata. DRAINAGE AREA.--58.2 sq mi (150.7 sq km). PERIOD OF RECORD.--Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1985 02... 1815 316 7.60 25.0 150 8.1 31 23000 28000 DEC 11... 0925 76 281 7.80 23.0 4.7 8.1 <10 4800 650 FEB 1986 11... 0925 28 342 8.05 21.5 4.9 7.8 89 35 K1100 20000 MAY 01... 0955 334 416 7.97 23.5 56 9.7 6300 7500 JUL 10... 0905 77 267 7.73 25.5 20 7.5 11 K12000 860 SEP 11... 0825 72 309 7.65 25.5 4.7 7.5 92 12 5900 770 HARD- ALKA- NESS MAW- SODIUM POTAS- LINITY CHLO- HARD- NONCARB CALCIUM SIUM, SODIUM, AD- SIUM, WATER SULFATE RIDE, NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL SULFIDE 01S- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1985 02... 120 0 42 3.8 6.6 0.3 2.0 121 <0.5 14 8.0 DEC 11... 110 FEB 1986 11... 127 MAY 01... 160 8 57 5.4 11 0.4 4.8 157 <0.5 15 10 JUL 10... 106 SEP 11... 110 3 36 5.4 12 0.5 2.3 109 10 9.7 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITPO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO20403 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) $102) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1985 02... <0.10 14 160 0.0 262 0.760 0.040 0.800 0.120 0.78 DEC 11... 5 1.32 0.080 1.40 0.080 0.42 FEB 1986 11... 10 0.950 0.050 1.00 0.480 0.82 MAY 01... <0.10 17 210 193 80 1.04 0.060 1.10 0.150 0.65 JUL 10... 17 1.02 0.080 1.10 C.120 0.38 SEP 11... 0.10 34 170 34 7 1.12 0.080 1.20 0.110 0.39 E = estimate K = non-ideal count 281 RIO CULEBRINAS BASIN 50147600 RIO CULEBRINAS NEAR SAN SEBASTIAN, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONTA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1985 02... 0.90 1.7 7.5 0.200 1 <100 40 1 16 20 DEC 11... 0.50 1.9 8.4 0.110 FEB 1986 11... 1.3 2.3 10 0.290 -- MAY 01... 0.80 1.9 8.4 0.140 1 100 50 1 11 10 JUL 10... 0.50 1.6 7.1 0.130 SEP 11... 0.50 1.7 7.5 0.090 -- MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1985 02... 8500 5 220 <0.10 <1 <1 30 <0.010 3 0.06 DEC 11... -- FEB 1986 11... MAY 01... 3600 4 100 <0.10 <1 <1 30 <0.010 <1 0.05 JUL 10... SEP 11... I I I I I I 282 RIO CULEBRINAS BASIN 50147800 RIO CULEBRINAS AT HIGHWAY 404 NEAR MOCA, PR LOCATION.--Lat 18°21'42', long 67°05'33', Hydrologic Unit 21010003, on right bank, at bridge on Highway 404, 0.3 mi (0.5 km) downstream from Quebrada Yagruma, and 2.8 mi (4.5 km) southeast of Moca. DRAINAGE AREA.--71.2 mi' (184.4 km 2 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--July 1967 to current year. GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 45 ft (14 m), from topographic map. REMARKS.--Estimated daily discharges: Nov. 5-20. Records fair except those for estimated daily discharges, which are poor. AVERAGE DISCHARGE.--19 years (1968-86), 310 ft'is (8.779 m'/s), 59.13 in/yr (1,502 mm/yr), 224,600 acre-ft/yr (277 hoP/yr); median of yearly mean discharges, 290 ft'A (8.21 10/s), 210,000 acre-ft/yr (260 hm'/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 69,000 ft'/s (1,950 '/s), Sept. 16, 1975, gage height, 36.6 ft (11.16 ) fro slope-area measurement, but ay have been exceeded by flood of Oct. 23, 1974, from rating curve extended above 2,600 ft'is (73.6 '/s) on basis of slope-area and contracted-opening measurements of peak flow; minimum discharge, 16 ft'is (0.453 m3 /s), Apr. 17-19, 1979. '/s) and maximum (*): EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 11,300 ft'/s (320 Discharge Gage height Discharge Gage height Date Time (W/s) (10/s) (ft) (m) Date Time (W/s) (11 3 /s) (ft) (m) Oct. 1 2030 20,400 578 26.11 7.958 May 3 2145 23,500 666 27.11 8.263 Oct. 7 1145 23,200 657 26.99 8.226 May 5 2030 *34,700 183 *30.12 9.181 Nov. 3 2030 25,400 719 27.65 8.428 May 6 1900 24,200 685 27.32 8.327 Apr. 27 0015 27,300 773 28.20 8.595 May 13 1015 29,800 844 28.88 8.803 Apr. 28 2230 11,300 320 22.43 6.837 May 26 2100 12,600 357 23.08 7.035 Apr. 29 2000 11,900 337 22.72 6.925 May 27 1830 15,400 436 24.28 7.400 Minimum discharge, 33 ft 3 /s (0.934 10/s), Mar. 15, 24, 27. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 4300 241 122 67 77 46 61 833 249 151 184 202 2 1280 204 119 66 70 48 51 862 222 146 315 940 3 362 5030 117 62 97 72 100 4370 207 141 201 313 4 275 1290 115 61 133 129 121 1660 190 137 143 212 5 238 1520 112 60 96 61 128 8440 178 132 431 144 6 460 1020 128 59 78 49 83 8440 168 149 307 123 7 10700 800 123 58 75 42 132 6790 311 239 272 103 8 900 660 108 58 66 39 312 962 420 165 299 94 1170 9 439 500 103 70 63 39 226 571 235 138 88 10 327 450 101 91 61 36 124 1710 1640 127 294 87 11 1470 400 99 63 63 75 85 580 375 147 196 81 12 587 380 96 60 60 53 1350 72 212 128 163 78 13 406 360 92 57 61 39 63 11700 246 115 148 83 14 275 370 88 54 56 37 56 4530 217 110 148 85 15 241 980 88 52 58 34 52 680 185 204 156 91 16 222 1100 87 50 53 45 53 482 175 222 226 75 17 203 700 84 49 55 109 368 154 155 70 58 161 18 187 390 83 50 54 172 96 316 166 129 128 70 19 177 260 83 48 63 60 77 287 601 136 139 67 20 169 206 82 48 80 46 120 263 685 705 115 64 21 166 195 79 45 92 39 163 382 479 193 106 63 22 158 178 77 47 63 38 194 287 477 i33 103 103 23 170 169 78 45 53 35 1010 523 291 119 98 77 24 242 159 75 43 50 35 1910 379 207 119 104 63 25 162 152 71 45 53 34 354 269 184 171 112 94 26 1860 146 70 44 50 41 3040 2100 238 887 171 88 27 1740 139 69 45 50 109 3350 2500 317 258 97 62 28 1700 135 68 42 49 200 2260 470 190 164 184 486 29 455 131 68 50 --- 305 3130 843 167 420 111 139 30 327 128 68 104 164 1100 426 158 243 134 98 31 280 --- 66 127 90 --- 292 --- 270 103 --- TOTAL 30478 18393 2819 1820 1879 2270 18632 63665 9544 6559 6513 4343 MEAN 983 613 90.9 58.7 67.1 73.2 621 2054 318 212 210 145 MAX 10700 5030 128 127 133 305 3350 11700 1640 887 1170 940 MIN 158 128 66 42 49 34 51 263 154 110 97 62 CFSI.1 13.8 8.61 1.28 .82 .94 1.03 8.72 28.8 4.47 2.95 2.98 2.04 IN. 15.92 9.61 1.47 .95 .98 1.19 9.73 33.26 4.99 3.43 3.40 2.27 AC-FT 60450 36480 5590 3610 3730 4500 36960 126300 18930 13010 12920 8610 CAL YR 1985 TOTAL 136055 MEAN 373 MAX 10700 MIN 33 CFSM 5.24 IN. 71.08 AC-FT 269900 WTR YR 1986 TOTAL 166915 MEAN 457 MAX 11700 MIN 34 CFSM 6.42 IN. 87.21 AC-FT 331100 283 RIO CULEBRINAS BASIN 50147800 RIO CULEBRINAS AT HIGHWAY 404 NEAR MOCA, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS AUGUST 1981 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) NOV, 20 1151 212 325 25.0 JUL, 09 0942 141 250 25.5 DEC, 11 0930 100 266 23.0 AUG, 11 1202 197 229 27.0 MAY, 06 1203 759 291 25.0 SEP, 04 1057 170 231 25.0 JUN, 11 1253 ?n6 242 25.0 RIO CULEBRINAS BASIN 50149100 RIO CULEBRINAS NEAR AGUADA, PR WATER-QUALITY RECORDS LOCATION.--Lat 18'24'03", long 67'09'40", at bridge on Highway 2, and 2.3 mi (3.7 km) northeast of Aguada plaza. DRAINAGE AREA.--97.0 Sq mi (251.2 sq km). PERIOD OF RECORD.--Water years 1958, 1970 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 OXYGEN, OXYGEN COLI- STREP- SPE- DIS- DEMAND, FORM, TOCOCCI STREAM- CIFIC SOLVED CHEM- FECAL, FECAL, FLOW, CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR INSTAN- DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME TANEOUS ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER (CFS) (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1985 03... 1400 269 7.40 26.0 140 5.2 30 50000 8000 DEC 10... 1250 167 310 7.80 24.5 2.9 8.1 <10 520 K11000 FEB 1986 10... 1500 70 i12 7.95 23.5 13 7.5 89 14 K1000 2500 APR 30... 1200 1710 312 7.60 25.5 190 5.5 36 K15000 36000 JUL 9... 1035 211 281 7.53 26.5 60 7.0 19 3100 2200 SEP 10... 1030 183 336 7.70 27.0 17 7.4 93 25 980 500 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- HARD- NONCARB CALCIUM SLUM, SODIUM, AD- SIUM, WATER SULFATE RIDE, NESS WATER DIS- D1S- DIS- SORP- DIS- TOTAL SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1985 03... 120 0 41 3.9 6.6 0.3 1.8 121 <0.5 14 8.8 DEC 10... 131 FEB 1986 10... 125 APR 30... 130 16 46 3.9 7.9 0.3 3.6 115 <0.5 15 9.0 JUL 9... 117 SEP 10... 130 0 42 5.7 12 0.5 2.3 130 9.6 9.9 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF SOLIDS, RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1985 03... 0.10 16 160 254 0.360 0.040 0.400 0.100 0.90 DEC 10... 3 0.870 0.030 0.900 0.100 0.40 FEB 1986 10... 26 0.570 0.030 0.600 C.130 0.27 APR 30... <0.10 14 170 776 320 0.750 0.050 0.800 0.170 0.73 JUL 9... 220 0.670 0.030 0.700 0.100 0.80 SEP 10... 0.10 33 190 95 31 0.870 0.030 0.900 0.110 0.19 E = estimate K = non-ideal count 284 RIO CULEBRINAS BASIN 50149100 RIO CULEBRINAS NEAR AGUADA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA's NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHORUS, ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1985 03... 1.0 1.4 6.2 0.200 1 100 30 <1 22 20 DEC 10... 0.50 1.4 6.2 0.090 FEB 1986 10... 0.40 1.0 4.4 0.070 APR 30... 0.90 1.7 7.5 0.200 1 100 30 3 20 30 JUL 9... 0.90 1.6 7.1 0.200 SEP 10... 0.30 1.2 5.3 0.070 -- MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL: SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1985 03... 11000 29 360 0.10 <1 <1 40 <0.010 3 0.05 DEC 10... FEB 1986 10... -- APR 30... 14000 10 350 0.20 <1 <1 40 <0.010 2 0.09 JUL 9... SEP 10... PESTICIDE ANALYSES CHLOR- DI- DI- PCB, ALDRIN, DANE, DDD, DDE, DDT, AZINON, ELDRIN DATE 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) JUL 1986 09... 1035 <0.1 <0.010 <0.1 <0.010 <0.010 <0.010 0.01 <0.010 HEPTA- METH- . ENDO- HEPTA- CHLOR MALA- OXY- SULFAN, ENDRIN, ETHION, CHLOR, EPDXIDE LINDANE THION, CHLOR, DATE TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUL 1986 09... <0.010 <0.010 <0.01 <0.010 <0.010 <0.010 0.02 <0.01 NAPH- THA- METHYL METHYL LENES, PARA- TRI- PARA- POLY- PER- TOX- TOTAL THION, THION, MIREX, THION, CHLOR. THANE APHENE, TRI- DATE TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL THION (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUL 1986 09... <0.01 <0.01 <0.01 <0.01 <0.10 <0.1 <1 <0.01 285 Discharge at Partial-Record Stations in Puerto Rico I 289 DISCHARGE AT CREST-STAGE PARTIAL-RECORD STATIONS The following table contains annual maximum discharge for crest-stage stations. A crest-stage gage is a device which will register the peak stage occurring between inspections of the gage . A stage-discharge relation for each gage is developed from discharge measurements made by indirect measurements of peak flow or by current meter. The date of the maximum discharge is not always certain but is usually determined by comparison with nearby continuous- record stations, weather record, or local inquiry. Only the maximum discharge for each water year is given. Infor­ mation on some lower floods may have been obtained, and discharge measurements may have been made for purposes of establishing the stage-discharge relation, but these are not published herein. The years given in the period of rec­ ord represent years for which the annual maximum has been determined. Annual maximum discharge at crest-stage partial-record stations during water year 1986 Annual maximum Drainage Period Gage Dis- Station Station name Location area of Date height charge number mi' record ft ft3 /s (km') (m) (m 3 /s) Rio Bucana basin 50114390 Rio Bucana Lat 18°02'29', long 66°34'58", 24.9 1985-86 10/07/85 129.88 17,400 Floodway Channel on left upstream side of (64.5) (39.59) (493) at Highway 14 Highway 14 bridge , .2 mi bridge near (.3 km) southeast of Escuela Ponce, PR Cerrillos, and 2.8 mi (4.5 km) northeast of Degetau Plaza in Ponce. Rio Portugues basin 50115900 Rio Portugues at Lat 18'01'09', long 66°36'26", 18.6 1963-86 10/07/85 17.67 12,000 Highway 14 at on left downstream side of (48.2) (5.386) (340) Ponce, PR Highway 14 bridge, 1.7 mi (2.7 km) downstream from Rio Chiquito, and 0.6 i (0.97 km) northeast of Degetau Plaza in Ponce. Water-Quality at Partial-Record Stations in Puerto Rico 293 ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATIONS Water-quality partial-record stations are particular 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 1985 TO SEPTEMBER 1986 DEPTH OXYGEN, COLI- AT SPE- TRANS- DIS- FORM, SAMPLE CIFIC PAR- SOLVED FECAL, LOC- CON- PH TEMPER- ENCY OXYGEN, (PER- 0.7 ATION, DUCT- (STAND- ATURE (SECCHI DIS- CENT UM-MF DATE TIME TOTAL ANCE ARD WATER DISK) SOLVED SATUR- (COLS./ (FEET) (US/CM) UNITS) (DEG C) (IN) (MG/L) ATION) 100 ML) RIO GUAJATACA BASIN 50010720 LAGO GUAJATACA NO.3 NR MOUTH NR QUEBRADILLAS,PR (LAT 18°22'05"N LONG 066°54'36"W) NOV 1985 20... 1015 1.00 267 8.05 26.0 52.0 K8 MAR 1986 06... 1125 1.00 285 8.35 26.5 77.0 7.2 92 68 AUG 22... 0905 1.00 254 8.05 29.0 90.0 7.8 104 K9 RIO GRANDE DE ARECIBO BASIN 50025110 LAGO DOS BOCAS NO.3 AT WEST BRANCH NR UTUADO,PR (LAT 18°19'15"N LONG 066°40 1 11"W) NOV 1985 19... 1010 1.00 198 7.50 25.5 10.0 K1300 MAR 1986 07... 1050 1.00 191 8.70 26.0 56.0 7.0 87 K9 AUG 21... 0905 1.00 212 7.95 30.0 44.0 8.7 117 31 RIO DE LA PLATA BASIN 50039900 LAGO CARITE NO.3 ON RIO DE LA PLATA NR CAYEY,PR (LAT 18°05 104"N LONG 066°06'03"W) NOV 1985 14... 1245 1.00 77 6.80 23.5 27.0 8.2 100 MAR 1986 12... 1205 1.00 87 8.60 24.5 63.0 6.6 84 AUG 18... 1205 1.00 7.65 27.5 83.0 7.6 50044400 LAGO LA PLATA NO.5 NR MOUTH NR NARANJITO, PR (LAT 18°19'33"N LONG 066°12 1 28"W) NOV 1985 13... 1505 1.00 333 8.00 25.0 11.0 K8500 MAR 1986 11... 1300 1.00 390 8.50 . 27.0 39.0 6.9 87 42 AUG 15... 1200 1.00 368 7.90 29.5 54.0 8.2 109 31 RIO GRANDE DE LOIZA BASIN 50057500 LAGO LOIZA NO.4 NR MOUTH NR CAGUAS, PR (LAT 18- 16 1 514 LONG 066°00'35"W) NOV 1985 15... 1130 214 7.55 24.0 4.00 20000 MAR 1986 04... '1425 1.00 382 7.40 26.0 30.0 5.0 62 >10 AUG 19... 1040 1.00 266 6.95 30.0 23.0 2.7 37 K1500 K = non-ideal count 294 ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATIONS WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 STREP- ALKA- SOLIDS, TOCOCCI UNITY RESIDUE NITRO- NITRO- NITRO- NITRO- NITRO- FECAL, WATER AT 105 GEN, GEN, GEN, GEN, GEN, KF AGAR TOTAL DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC (COLS. FIELD SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE PER MG/L AS PENDED (MG/L (MG/L (MG/L (MG/L (MG/L 100 ML) CAC03 (MG/L) AS N) AS N) AS N) AS N J AS N) RIO GUAJATACA BASIN--CONTINUED 50010720 LAGO GUAJATACA NO.3 NR MOUTH NR QUEBRADILLAS,PR (LAT 18°22'05"N LONG 066°54'36"W) NOV 1985 20... 50 118 1 <0.010 <0.100 0.010 0.69 MAR 1986 06... 37 123 2 <0.010 <0.100 0.030 0.47 AUG 22... 28 116 2 <0.010 <0.100 0.020 0.48 RIO GRANDE DE ARECIBO BASIN-CONTINUED 50025110 LAGO DOS BOCAS NO.3 AT WEST BRANCH NR UTUADO,PR (LAT 18°19'15"N LONG 066°40 1 11"W) NOV 1985 19... 650 59 18 0.760 0.040 0.800 0.020 0.58 MAR 1986 07... 45 66 4 0.190 0.010 0.200 0.020 0.38 AUG 21... 100 82 1 <0.010 <0.100 0.010 0.39 RIO DE LA PLATA BASIN--CONTINUED 50039900 LAGO CARITE NO.3 ON RIO DE LA PLATA NR CAYEY,PR (LAT 18°05'04"N LONG 066°06'03"W) NOV 1985 14... 27 5 0.090 0.010 0.100 0.020 0.28 MAR 1986 12... 31 6 - <0.010 <0.100 <0.010 AUG 18... 32 4 <0.010 <0.100 0.020 0.18 50044400 LAGO LA PLATA NO.5 NR MOUTH NP NARANJITO, PR (LAT 18°19'33"N LONG 066°12 1 28"W) NOV 1985 13... 4200 116 33 0.880 0.020 0.900 0.030 0.47 MAR 1986 11... K5 144 4 0.070 0.030 0.100 0.020 0.48 AUG 15... K15 142 <1 <0.010 <0.100 0.020 0.28 RIO GRANDE DE LOIZA BASIN--CONTINUED 50057500 LAGO LOIZA NO.4 NR MOUTH NR CAGUAS, PR (LAT 18°16'51"N LONG 066°00'35"W) NOV 1985 15... 32000 69 204 0.520 0.080 0.600 0.320 1.1 MAR 1986 04... 69 105 1 0.350 0.050 0.400 1.30 0.80 AUG 19... K250 81 18 0.410 0.090 0.500 0.880 0.52 K = non-ideal count ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATIONS WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 NITRO- CHLOR-A CHLOR-B GEN,AM- PHYTO- PHYTO- MONIA + NITRO- NITRO- PHOS- PLANK- PLANK- PLANK- PLANK- ORGANIC GEN, GEN, PHORUS, TON TON TON TON TOTAL TOTAL TOTAL TOTAL CHROMO CHROMO BIOMASS BIOMASS DATE (MG/L (MG/L (MG/L (MG/L FLUOROM FLUOROM ASH WT DRY WT AS N) AS N) AS NO3) AS P) (UG/L) (UG/L) (MG/L) (MG/L) RIO GUAJATACA BASIN--CONTINUED 50010720 LAGO GUAJATACA NO.3 NR MOUTH NR QUEBRADILLAS,PR (LAT 18°22'05"N LONG 066°54 1 36"W) NOV 1985 20... 0.70 0.030 30.0 4.20 MAR 1996 06... 0.50 0.020 17.0 2.40 AUG 22... 0.50 0.020 9.30 0.800 3.5 220 RIO GRANDE DE ARECIBO BASIN--CONTINUED 50025110 LAGO DOS BOCAS NO.3 AT WEST BRANCH NR UTUADO,PR (LAT 18'19'154 LONG 066°40'11"W) NOV 1985 19... 0.60 1.4 6.2 0.070 16.0 0.400 MAR 1986 07... 0.40 0.60 2.7 0.030 14.0 3.90 3.0 230 AUG 21... 0.40 0.030 17.0 1.40 7.0 6280 RIO DE LA PLATA BASIN--CONTINUED 50039900 LAGO CARITE NO.3 ON RIO DE LA PLATA NR CAYEY,PR (LAT 18°05'04"N LONG 066°06 1 03"W) NOV 1985 14... 0.30 0.40 1.8 0.010 11.0 0.700 MAR 1986 12... <0.20 0.010 17.0 5.80 75 330 AUG 18... 0.20 0.020 10.0 2.70 9.8 240 50044400 LAGO LA PLATA NO.5 NR MOUTH NR NARANJITO, PR (LAT 18°19'33"N LONG 066°12'28"W) NOV 1985 13... 0.50 1.4 6.2 0.170 18.0 4.10 MAR 1986 11... 0.50 0.60 2.7 0.160 30.0 3.80 3.2 250 AUG 15... 0.30 0.090 72.0 14.0 13 180 RIO GRANDE DE LOIZA BASIN--CONTINUED 50057500 LAGO LOIZA NO.4 NR MOUTH NR CAGUAS, PR (LAT 18°I6'51"N LONG 066°00'35"W) NOV 1985 15... 1.4 2.0 8.9 0.350 1.60 0.300 MAR 1986 04... 2.1 2.5 11 0.660 76.0 2.20 AUG 19... 1.4 1.9 8.4 0.470 3.40 0.300 3.9 260 295 ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATIONS WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 DEPTH OXYGEN, COLI- STREP- AT SPE- TRANS- CIS- FORM, TOCOCCI SAMPLE CIFIC PAR- SOLVED FECAL, FECAL, LOC- CON- PH TEMPER- ENCY OXYGEN, (PER- 0,7 KF AGAR ATION, DUCT- (STAND- ATURE (SECCHI DIS- CENT UM-MF (COLS. DATE TIME TOTAL ANCE ARD WATER DISK) SOLVED SALM- (COLS./ PER (FEET) (US/CM) UNITS) (DEG C) (IN) (MG/L) ATION) 100 ML) 100 ML) RIO GUAJATACA BASIN--CONTINUED 50010790 NOV 1985 20... 20... MAR 1986 06... 06... AUG 22... 22... 0930 0935 1030 1040 0930 0935 LAGO GUAJATACA NO.1 NR DAM NR QUEBRADILLAS,PR (LAT 18°23'56"N LONG 066°55'23"W) 1.00 264 7.95 26.0 52.0 K3 <1 74.0 321 7.85 24.0 -- -- -- 1.00 280 8.30 26.0 78.0 6.8 86 K7 K13 78.0 309 7.45 24.0 -- 0.4 5 -- -- 1.00 259 7.95 28.5 140 7.4 98 K7 24 44.0 303 7.15 24.5 0.2 2 -- -- RIO GRANDE DE ARECIBO BASIN--CONTINUED 50020050 LAGO GARZAS NO.1 NR DAM NR ADJUNTAS,PR (LAT 18°08'21"N LONG 066°44'35"W) NOV 1985 18... 1415 1.00 109 7.00 21.5 18.0 340 360 18... 1430 76.0 94 6.60 20.5 -- -- MAR 1986 05... 1450 1.00 137 8.75 24.5 58.0 K4/ KE1 05... 1440 100.0 155 7.25 21.5 -- -- -- AUG 20... 1230 1.00 141 8.05 26.5 29.0 K7 <1 20... 1220 86.0 155 7.00 22.0 -- -- 50027090 LAGO DOS BOCAS NO.1 NR DAM NR UTUADO,PR (LAT 18°20'09"N LONG 066°40'04"W) NOV 1985 19... 1110 1.00 172 7.85 26.5 13.0 8C K8 19... 1120 82.0 156 7.15 23.0 -- MAR 1986 07... 0955 1.00 195 8.75 26.0 56.0 7.2 90 27 K15 07... 0950 86.0 206 7.20 23.5 -- 0.4 5 -- -- AUG 21... 1050 1.00 212 8.00 30.0 56.0 7.2 97 K7 K4 21... 1045 78.0 227 6.80 28.0 -- 0.6 8 -- -- RIO DE LA PLATA BASIN--CONTINUED 50039950 NOV 1985 14... 14... MAR 1986 12... 12... AUG 18... 18... 1200 1205 1120 1125 1115 1125 LAGO CARITE NO.1 NR DAM NR CAYEY.PR (LAT 18°04'39"N LONG 066°06'19"W) 1.00 67 6.75 25.0 22 K8 67.0 78 6.55 22.0 -- -- -- 1.00 88 -- 24.0 55.0 50 K12 63.0 90 7.05 22.0 -- -- 1.00 100 7.45 27.5 111 K1 K14 69.0 92 6.10 23.0 - -- 50044950 LAGO LA PLATA NO.3 NR DAM NR NARANJITO, PR (LAT 18°20'18"N LONG 066°14'01"W) NOV 1985 13... 1250 1.00 285 7.65 26.5 16.0 340 300 13... 1405 66.0 128 6.70 23.0 -- -- MAR 1986 11... 1145 1.00 369 8.20 26.5 51.0 5.8 73 K' 21 11... 1150 59.0 309 7.20 23.5 0 0 AUG 15... 1300 1.00 621 7.65 30.0 73.0 7.3 98 15... 1250 57.0 158 6.80 22.5 0 0 RIO GRANDE DE LOIZA BASIN--CONTINUED 50058800 LAGO LOIZA NO.7 NR DAM NR TRUJILLO ALTO, PR (LAT 18°191 29"N LONG 066°00 1 47"W) NOV 1985 15... 1040 1.00 261 7.20 26.0 20.0 2300 400 15... 1035 24.0 251 7.20 25.5 -- MAR 1986 04... 1530 1.00 338 8.05 26.0 40.0 7.8 97 30 22 04... 1525 27.0 343 7.20 24.5 0.2 2 -- AUG 19... 1000 1.00 265 7.55 30.0 32.0 K12 K120 19... 0950 33.0 304 6.85 29.0 -- -- -- K = non-ideal court 296 297 ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATIONS WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- HARD- NONCARB CALCIUM SIUM, SODIUM, AD- SIUM, WATER SULFATE RIDE, NESS WATER DIS- DIS- DIS- SORP- DIS- TOTAL ' DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L . RATIO (MG/L MG/L AS (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS SO4) AS CL) RIO GUAJATACA BASIN--CONTINUED 50010790 LAGO GUAJATACA NO.1 NR DAM NR QUEBRADILLAS,PR (LAT 18°23'56"N LONG 066°55 1 23"W) NOV 1985 20... 120 10 43 3.1 5.0 0.2 1.5 110 9.6 7.1 20... 150 35 55 3.0 4.5 0.2 1.5 115 10 6.5 MAR 1986 06... 130 14 48 3.5 5.4 0.2 1.6 120 8.4 7.3 06... 150 ' 28 54 3.5 5.6 0.2 1.9 121 9.5 8.0 AUG 22... 120 1 41 3.1 4.9 0.2 1.6 114 9.0 6.9 22... 130 0 49 2.8 4.2 0.2 1.5 143 8.4 5.4 RIO GRANDE DE ARECIBO BASIN--CONTINUED 50020050 LAGO GARZAS NO.1 NR DAM NR ADJUNTAS,PR (LAT 18°08'21"N LONG 066°44 1 35"W) NOV 1985 18... 40 0 11 3.1 5.0 0.4 0.90 41 5.2 4.6 18... 37 0 10 3.0 4.4 0.3 1.0 38 5.0 4.5 MAR 1986 05... 58 0 16 4.4 6.1 0.4 1.0 59 3.3 5.5 05... 61 0 17 4.6 6.2 0.4 1.0 62 3.3 5.3 AUG 20... 62 0 17 4.8 6.6 0.4 1.1 66 3.9 5.8 20... 61 0 17 4.5 5.4 0.3 1.5 72 4.9 5.1 50021090 LAGO DOS BOCAS NO.1 NR DAM NR UTUADO,PF (LAT 18°20'09"N LONG 066°40 1 04"W) NOV 1985 19... 61 6 16 5.0 8.1 0.5 1.7 55 11 7.8 19... 59 4 17 4.1 7.2 0.4 1.6 55 8.3 10 MAR 1986 07... 76 8 20 6.4 11 0.6 1.8 68 13 9.6 07... 80 6 21 6.6 10 0.5 2.1 74 12 9.4 AUG 21... 79 2 21 6.4 10 0.5 2.0 77 14 10 21... 90 0 24 7.2 11 0.5 2.3 94 14 10 RIO DE LA PLATA BASIN--CONTINUED 50039950 LAGO CARITE NO.1 NR DAM NR CAYEY.PR (LAT 18°04'39"N LONG 066°06'19"W) NOV 1985 14... 23 1 4.1 3.0 6.5 0.6 0.70 22 1.9 7.2 14... 25 0 5.0 3.1 7.2 0.6 0.70 27 4.7 7.6 MAR 1986 12... 28 0 5.6 3.4 7.7 0.6 0.70 30 3.8 8.8 12... 29 0 6.0 3.4 7.4 0.6 0.70 30 3.8 8.5 AUG 18... 28 0 5.8 3.2 12 1 0.90 32 5.7 8.8 18... 28 0 5.9 3.3 6.2 0.5 1.4 36 8.7 10 50044950 LAGO LA PLATA NO.3 NR DAM NR NARANJITO, PR (LAT 18°20'18"N LONG 066°14:01"W) NOV 1985 13... 100 7 25 10 15 0.7 1.9 97 15 18 13... 45 1 11 4.2 6.9 0.5 2.1 44 8.9 7.1 MAR 1986 11... 140 10 34 14 22 0.8 2.2 133 13 23 11... 120 9 29 12 16 0.7 2.3 113 11 17 AUG 15... 130 5 29 13 20 0.8 1.3 121 16 24 15... 52 0 13 4.7 6.8 0.4 2.2 56 8.8 11 RIO GRANDE DE LOIZA BASIN--CONTINUED 50058800 LAGO LOIZA NO.7 NR DAM NR TRUJILLO ALTO, PR (LAT 18°19'294 LONG 066°00 1 47"W) NOV 1985 15... 87 5 20 9.0 19 0.9 2.3 82 14 18 15... 81 2 19 8.2 18 0.9 2.7 79 16 16 MAR 1986 04... 99 10 23 10 26 1 2.3 89 16 24 04... 99 4 23 10 25 1 2.3 95 16 25 AUG 19... 78 0 18 8.0 22 1 2.8 85 18 20 19... 82 0 19 8.3 22 1 3.0 93 16 21 298 ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATIONS WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 SOLIDS, SOLIDS, FLUO- SILICA, SUM OF RESIDUE NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- AT 105 GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, DEG. C, NITRATE NITRITE NO20403 AMMONIA SOLVED (MG/L DIS- SUS- TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PENDED (MG/L S(MG/L (MG/L (MG/L AS F) SI02) (MG/L) (MG/L) AS N) AS N) AS N) AS N) RIO GUAJATACA BASIN--CONTINUED 50010790 LAGO GUAJATACA NO.1 NR DAM NR QUEBRADILLAS,PR (LAT 18°23'56"N LONG 066°55'23"W) NOV 1985 20... <0.10 2.0 140 2 <0.010 <0.100 0.010 20... <0.10 5.0 150 -- MAR 1986 06... 0.20 4.8 150 2 <0.010 <0.100 0.020 06... 0.20 6.3 160 AUG 22... 0.10 6.4 140 1 <0.010 <0.100 0.020 22... 0.10 6.9 160 -- RIO GRANDE DE ARECIBO BASIN--CONTINUED 50020050 LAGO GARZAS NO.1 NR DAM NR ADJUNTAS,PR (LAT 18°081 21"N LONG 066°44 1 35"W) NOV 1985 18... <0.10 15 69 7 <0.010 0.300 0.020 18... <0.10 14 65 -- MAR 1986 05... 0.20 19 91 4 <0.010 <0.100 0.020 05... 0.20 19 94 AUG 20... <0.10 17 96 6 <0.010 <0.100 0.030 20... <0.10 17 99 -- 50027090 LAGO DOS BOCAS NO.1 NR DAM NR UTUADO,PR (LAT 18°20'09"N LONG 066°40'04"W) NOV 1985 19... <0.10 20 100 4 0.670 0.030 0.700 0.030 19... <0.10 21 100 -- MAR 1986 07... 0.20 18 120 5 0.090 0.010 0.100 0.020 07... 0.10 22 130 AUG 21... 0.10 22 130 3 <0.010 .40.100 0.020 21... 0.10 24 150 RIO DE LA PLATA BASIN--CONTINUED 50039950 LAGO CARITE NO.1 NR DAM NR CAYEY.PR (LAT 18°04'39"N LONG 066'06'19"W) NOV 1985 14... <0.10 14 51 5 0.010 <0.100 0.020 14... <0.10 17 61 -- MAR 1986 12... 0.20 16 64 4 <0.010 <0.100 <0.010 12... 0.20 17 65 -- -- -- AUG 18... <0.10 19 75 3 <0.010 <0.100 0.020 18... <0.10 13 70 -- 50044950 LAGO LA PLATA NO.3 NR DAM NR NARANJITO, PR (LAT 18°20 1 18"N LONG 066°14'01"W) NOV 1985 13... 0.10 22 170 12 0.790 0.010 0.800 0.020 13... 0.10 14 81 -- MAR 1986 11... 0.10 20 210 4 <0.010 <0.100 <0.010 11... 0.10 22 180 -- -- -- AUG 15... 0.20 18 190 1 <0.010 <0.100 0.020 15... 0.20 13 93 -- RIO GRANDE DE LOIZA BASIN--CONTINUED 50058800 LAGO LOIZA NO.7 NR DAM NR TRUJILLO ALTO, PR (LAT 18°19'29"N LONG 066 00'47"W) NOV 1985 15... 0.10 29 160 14 0.730 0.070 0.800 0.090 15,.. 0.10 27 150 -- MAR 1986 04... 0.20 23 180 5 0.260 0.040 0.300 0.020 04... 0.20 24 180 AUG 19... 0.20 20 160 5 0.030 0.070 0.100 0.020 19... 0.20 23 170 299 ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATIONS WATER-QUALITY DATA, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 NITRO- CHLOR-A CHLOR-B NITRO- GEN,AM- PHYTO- PHYTO- GEN, MONIA + NITRO- NITRO- PHOS- PLANK- PLANK- PLANK- PLANK- ORGANIC ORGANIC GEN, GEN, PHORUS, TON TON TON TON TOTAL TOTAL TOTAL TOTAL TOTAL CHROMO CHROMO BIOMASS BIOMASS DATE (MG/L (MG/L (MG/L (MG/L (MG/L FLUOROM FLUOROM ASH WT DRY WT AS N) AS N) AS N) AS NO3) AS P) (UG/L) (UG/L) (MG/L) (MG/L) RIO GUAJATACA BASIN--CONTINUED 50010790 LAGO GUAJATACA NO.1 NR DAM NR QUEBRADILLAS,PR (LAT 18°23'56"N LONG 066°55'23"W) NOV 1985 20... 0.59 0.60 0.020 24.0 2.10 20... MAR 1986 06... 0.28 0.30 0.020 9.20 0.400 06... AUG 22... 0.38 0.40 0.010 2.40 0.200 4.7 270 22... RIO GRANDE DE ARECIBO BASIN--CONTINUED 50020050 LAGO GARZAS NO.1 NR DAM NR ADJUNTAS,PR (LAT 18°08'21"N LONG 066°44 1 35"W) NOV 1985 18... 0.48 0.50 0.80 3.5 0.030 15.0 0.500 18... -- -- -- -- MAR 1986 05... 0.38 0.40 0.020 27.0 2.40 5.0 270 05... -- -- -- -- -- AUG 20... 0.37 0.40 0.020 19.0 0.300 8.2 280 20... -- -- -- -- 50027090 LAGO DOS BOCAS NO.1 NR DAM NR UTUADO,PR (LAT 18°20'09"N LONG 066°40'04"W) NOV 1985 19... 0.67 0.70 1.4 6.2 0.080 36.0 1.30 19... -- -- -- -- -- MAR 1986 07... 0.38 0.40 0.50 2.2 0.020 11.0 0.300 4.2 270 07... -- -- AUG 21... 0.28 0.30 0.020 15.0 1.30 6.4 280 21... -- -- -- -- RIO DE LA PLATA BASIN--CONTINUED 50039950 LAGO CARITE NO.1 NR DAM NR CAYEY.PR (LAT 18°04'39"N LONG 066°06 1 19"W) NOV 1985 14... 0.38 0.40 0.010 9.40 0.100 14... -­ MAR 1986 12... <0.20 0.020 14.0 4.90 3.2 260 12... AUG 18... 0.38 0.40 0.030 3.10 0.700 8.4 250 18... 50044950 LAGO LA PLATA NO.3 NR DAM NR NARANJITO, PR (LAT 18°20 118"N LONG 066°14 101"W) NOV 1985 13... 0.68 0.70 1.5 6.6 0.140 43.0 9.10 13... -- -- -- -- -- MAR 1986 11... 0.50 0.060 32.0 4.40 4.6 260 11... -- -- -- -- -- AUG 15... 0.38 0.40 0.030 32.0 2.30 12 280 15... -- -- -- -- RIO GRANDE DE LOIZA BASIN--CONTINUED 50058800 LAGO LOIZA NO.7 NR DAM NR TRUJILLO ALTO, PR (LAT 18°19'29"N LONG 066°00 1 47"W) NOV 1985 15... 0.61 0.70 1.5 6.6 0.170 33.0 1.40 15... -- -- -- -- MAR 1986 04... 0.88 0.90 1.2 5.3 0.190 58.0 3.50 04... -- -- -- -- -- AUG 19... 0.68 0.70 0.80 3.5 0.181 42.0 3.30 13 550 19... -- 0.430 -- -- 303 GROUND-WATER LEVELS RIO GUAJATACA BASIN 182422067015100. Local number, 165. LOCATION.--Lat 18°24'22", long 67°01'51". Owner: P.R. Aqueduct and Sewer Authority. Name: Saltos # 1 (Mateo Perez). AQUIFER.--Cibao Formation, Aguada Limestone. WELL CHARACTERISTICS.--Drilled production water-table well, diameter 16 in (0.40 m), cased 16 in (0.40 m) 0-40 ft (0-12.2 m), cased 12 in (0.30 m) 40-200 ft (12.2-61.0 m). Depth 200 ft (61.0 m) DATUM.--Elevation of land-surface datum is 689 ft (210 m) above mean sea level. Measuring point: Hole on pump base, 0.80 ft ((0.24 m) above land-surface datum. Prior November 1985, hole on top of pump base, 1.00 ft (0.30 m) above land-surface datum. REMARKS.--Pumping discontinued. Observation well. Automatic recorder installed on November 14, 1985. Formerly published as 182421067015000. PERIOD OF RECORD. lanuary 1982 to March 1985. November 1985 to September 1986. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 53.39 ft (16.27 m) below land-surface datum, Sept. 23, 1986; lowest water level recorded, 70.60 ft (21.52 m) below land-surface datum, June 18, 1982. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 59.85 59.23 58.76 57.91 57.29 56.70 55.82 55.20 54.48 53.83 2 59.85 59.19 58.66 57.87 57.25 56.69 55.81 55.21 54.50 53.90 3 59.84 59.07 58.67 57.91 57.27 56.65 55.79 55.17 54.50 53.93 4 59.82 59.11 58.65 57.91 57.28 56.63 55.74 55.16 54.46 53.91 5 59.78 59.13 58.59 57.89 57.25 56.60 55.75 55.11 54.46 53.85 6 59.59 59.11 58.59 57.85 57.24 56.55 55.76 55.09 54.42 53.84 7 59.61 59.08 58.60 57.84 57.19 56.47 55.72 55.08 54.37 53.85 8 59.61 59.09 58.64 57.88 57.18 56.31 55.71 55.09 54.35 53.82 9 59.60 59.10 58.56 57.91 57.15 56.30 55.70 55.07 54.34 53.82 10 59.61 59.06 58.54 57.89 57.11 56.31 55.70 55.06 54.33 53.81 11 59.57 59.03 58.59 57.79 57.11 56.30 55.65 54.99 54.32 53.70 12 59.59 59.07 58.50 57.76 57.08 56.31 55.64 54.96 54.33 53.63 13 59.57 59.06 58.43 57.78 57.02 56.23 55.59 54.96 54.29 53.70 14 59.51 58.98 58.44 57.74 56.98 56.26 55.54 54.92 54.26 53.72 15 60.15 59.50 59.05 58.45 57.70 57.00 56.28 55.53 54.83 54.18 53.71 16 60.05 59.50 59.03 58.40 57.65 57.04 56.25 55.51 54.81 54.15 53.68 17 60.00 59.49 58.99 58.36 57.66 57.05 56.20 55.47 54.79 54.16 53.64 18 60.16 59.44 58.87 58.40 57.66 57.04 56.18 55.41 54.79 54.17 53.66 19 60.21 59.44 58.89 58.48 57.68 56.97 56.19 55.43 54.72 54.18 53.65 20 60.16 59.41 59.05 57.80 57.68 56.97 56,19 55.42 54.68 54.19 53.64 21 60.11 59.39 58.89 57.94 57.60 56.98 56.14 55.36 54.70 54.17 53.58 22 60.12 59.30 58.81 57.95 57.57 56.96 56.09 55.33 54.81 54.09 53.49 23 60.06 59.23 58.82 57.95 57.58 56.94 56.09 55.34 54.79 53.99 53.45 24 60.04 59.24 58.82 57.94 57.61 56.88 56.07 55.32 54.66 53.98 53.50 25 60.00 59.28 58.72 57.85 57.60 56.86 56.01 55.30 54.6 9 54.05 53.58 26 59.98 59.23 58.71 57.83 57.54 56.82 55.94 55.29 54.71 54.10 53.58 27 59.96 59.23 58.74 57.88 57.48 56.79 55.95 55.27 54.67 54.04 53.46 28 59.96 59.24 58.78 57.94 57.45 56.75 55.93 55.23 54.63 53.97 53.46 29 59.96 59.30 58.74 57.41 56.74 55.90 55.24 54.58 53.98 53.52 30 59.87 59.22 58.77 57.37 56.70 55.87 55.20 54.55 54.00 53.57 31 59.23 58.83 57.35 55.87 54.51 53.92 LOW 59.85 59.23 58.76 57.91 57.29 56.70 55.82 55.21 54.50 53.93 HIGH 59.22 58.71 57.80 57.35 56.70 55.87 55.20 54.51 53.92 53.45 45 9x gip 1-4 la 0 50 L'J Z 4 Lt. 55 -J w e, 60 :7 ta 1 cz z W5 65 3 NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1985 1966 304 GROUND-WATER LEVELS RIO GUAJATACA BASIN 182647066552400. Local number, 202. LOCATION.--Lat 18°26'47", long 66°55'24". Owner: P.R. Aqueduct and Sewer Authority. Name: Carmelo Barreto Garcia well. AQUIFER.--Aguada Limestone. WELL CHARACTERISTICS.--Drilled water-table well, diameter 20 in (0.51 m), cased 20 in (0.51 m) 0-296 ft (0-90.2 m), diameter 13 in (0.33 m), cased 13 in (0.33 m) 0-550 ft (0-167.6 a), perforated 270-529 ft (82.3-161.2 m). Depth 550 ft (167.6 m). DATUM.--Elevation of land-surface datum is about 475 ft (145 m) above mean sea level, from topographic map. Measuring point: Hole on side of casing, 1.50 ft (0.46 m) above land-surface datum. Prior July 25, 1986, top of shelter floor, 3.30 ft (1.00 a) above land-surface datum. REMARKS.--Abandoned observation well. Automatic recorder installed on November 13, 1985. PERIOD OF RECORD.--November 1985 to September 1986. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 409.17 ft (127.76 m) below land-surface datum, Sept. 25,-1986; lowest water level recorded, 452.80 ft (138.01 m) below land-surface datum, June 26, 1986. DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 --- 432.09 433.34 434.55 435.83 434.36 451.94 451.18 2 433.90 432.10 433.35 434.58 435.85 434.04 451.81 451.27 3 433.70 432.13 433.37 434.68 435.88 433.70 451.67 451.34 4 433.55 432.16 433.45 434.71 435.92 433.15 451.59 451.36 5 433.39 432.20 433.51 434.76 435.92 432.23 451.48 451.41 6 433.24 432.24 433.58 434.78 435.92 431.32 451.40 451.47 7 433.08 432.26 433.60 434.84 435.91 430.56 451.35 451.50 8 432.96 432.29 433.63 434.92 435.90 429.84 451.29 451.55 9 432.82 432.36 433.67 434.98 435.88 429.17 451.20 451.63 10 432.69 432.36 433.72 435.02 435.81 428.59 451.13 451.68 11 432.57 432.36 433.77 435.03 435.71 428.05 451.07 451.75 12 432.43 432.41 433.81 435.08 435.69 427.53 451.03 451.83 13 --- --- 432.33 432.43 433.83 435.14 435.60 426.93 451.01 451.87 14 --- 435.31 432.23 432.49 433.89 435.17 435.56 426.24 450.98 451.90 15 --- 435.18 432.14 432.55 433.93 435.20 435.51 425.25 450.90 451.94 16 435.02 432.06 432.61 433.99 435.24 435.45 423.99 450.90 451.98 17 434.83 431.97 432.63 434.03 435.30 435.41 422.77 450.86 452.08 18 434.71 --- 432.64 434.03 435.36 435.39 421.84 450.86 452.19 19 --- 431.96 432.69 434.05 435.42 435.34 420.95 450.84 --- 20 --- 431.93 432.72 434.12 435.47 435.34 --- 450.84 21 431.91 432.78 434.16 435.48 435.33 450.88 22 431.92 432.83 434.22 435.54 435.30 450.98 23 431.91 432.85 434.26 435.58 435.27 450.99 24 431.96 432.90 434.32 435.63 435.21 450.96 25 431.96 432.93 434.31 435.67 435.17 450.99 26 431.99 432.97 434.37 435.69 435.11 --- 451.03 409.29 27 432.01 433.00 434.46 435.71 435.05 452.60 451.05 409.33 28 431.99 433.09 434.53 435.76 434.98 452.38 451.06 409.41 29 431.99 433.15 --- 435.81 434.90 452.24 451.08 409.53 30 432.03 433.20 --- 435.82 434.71 452.06 451.12 409.64 31 432.08 433.28 --- 435.84 --- --- 451.15 --- LOW 433.28 434.53 435.84 435.92 451.94 HIGH 432.09 433.34 434.55 434.71 450.84 400 W co < La 0 1...J 420 c.) z< -J > La cn 440 La I -J Z LaJ < < 460 NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1985 1986 305 GROUND-WATER LEVELS RIO CAMUY BASIN 182856066510900. Local number, 203. LOCATION.--Lat 18°28'56", long 66°51'09". Owner: P.R. Industrial Development Corporation. Name: Vicente Amedor Well. AQUIFER.--Aymamon Limestone. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 8 in (0.20 m), cased 8 in (0.20 m) 0-130 ft (0-39.6 m), perforated 110-130 (33.5-39.6 m); open hole 130-140 ft (39.6-42.7 m). Depth 140 ft (42.7 m). DATUM.--Elevation of land-surface datum is about 116 ft (35.4 m) above mean sea level, from topographic map. Measuring point: Top of shelter floor, 2.97 ft (0.90 m) above land-surface datum. REMARKS.--Abandoned observation well. Automatic recorder installed on November 14,1985. PERIOD OF RECORD.--November 1985 to September 1986. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorder, 97.99 ft (29.87 m) below land-surface datum, June 27, 1986; lowest water le el recorded, 99.70 ft (30.38 m) below land-surface datum, Dec. 6, 1985. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 98.85 99.24 99.36 99.49 99.48 98.92 98.24 98.56 98.76 98.69 2 98.86 99.26 99.36 99.51 99.47 98.84 98.25 98.58 98.77 98.69 3 98.87 99.25 99.39 99.53 99.45 98.74 98.26 98.59 98.79 98.68 4 98.88 99.27 99.38 99.56 99.45 98.64 98.28 98.60 98.80 98.70 5 98.87 99.27 99.37 99.60 99.45 98.59 98.31 98.60 98.81 98.69 6 98.87 99.27 99.39 99.61 99.44 98.56 98.34 98.61 98.80 98.69 7 98.86 99.26 99.36 99.62 99.44 98.50 98.37 98.62 98.80 98.68 8 98.87 99.27 99.38 99.61 99.41 98.44 98.39 98.65 98.80 98.71 9 98.87 99.29 99.35 99.62 99.35 98.40 98.44 98.67 98.80 98.73 10 98.88 99.27 99.36 99.62 99.27 98.37 98.46 98.69 98.80 98.75 11 98.93 99.30 99.37 99.62 99.21 98.34 98.47 98.70 98.79 98.76 12 98.97 99.28 99.35 99.61 99.20 98.31 98.50 98.70 98.79 98.76 13 99.03 99.29 99.37 99.61 99.18 98.26 98.52 98.70 98.78 98.77 14 98.71 99.07 99.30 99.37 99.63 99.16 98.10 98.53 98.70 98.76 98.77 15 98.73 99.08 99.30 99.37 99.63 99.16 98.03 98.55 98.70 98.73 98.78 16 98.67 99.10 99.30 99.38 99.65 99.18 97.99 98.56 98.69 98.73 98.79 17 98.61 99.11 99.30 99.38 99.65 99.20 98.00 98.56 98.69 98.72 98.77 18 98.62 99.11 99.30 99.38 99.66 99.21 98.02 98.56 98.70 98.72 98.76 19 98.65 99.10 99.30 99.39 99.67 99.20 98.03 98.57 98.70 98.73 98.78 20 98.66 99.12 99.29 99.61 99.68 99.21 98.05 98.57 98.71 98.73 98.79 21 98.66 99.15 99.30 99.59 99.67 99.20 98.08 98.58 98.70 98.73 98.79 22 98.67 99.16 99.30 99.58 99.64 99.14 98.10 98.59 98.69 98.72 98.79 23 98.67 99.16 99.33 99.57 99.60 99.12 98.11 98.60 98.70 98.71 98.81 24 98.66 99.18 99.32 99.53 99.58 99.11 98.14 98.63 98.70 98.69 98.82 25 98.67 99.17 99.33 99.52 99.53 99.10 98.17 98.65 98.70 98.66 98.81 26 98.71 99.20 99.34 99.50 99.53 99.10 98.18 98.65 98.71 98.64 98.83 27 98.76 99.19 99.34 99.49 99.53 99.10 98.21 98.54 98.72 98.69 98.84 28 98.80 99.19 99.36 99.49 99.52 99.09 98.23 98.55 98.73 98.68 98.86 29 98.82 99.21 99.36 99.51 99.01 98.23 98.56 98.72 98.71 98.86 30 98.83 99.20 99.35 99.50 98.95 98.23 98.56 98.72 98.70 98.86 31 99.24 99.38 99.49 98.23 98.74 98.69 LOW 99.24 99.38 99.61 99.68 99.48 98.92 98.65 98.74 98.81 98.86 HIGH 98.85 99.24 99.35 99.49 98.95 97.99 98.24 98.56 98.64 98.68 gi3R 1- 4( ta ci ew 98 z< usa 99 cz 100 NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1985 1986 97 306 GROUND-WATER LEVELS RIO GRANDE DE ARECIBO BASIN 182737066370900. Local number, 204. LOCATION.--Lat 18'27'37", long 66°37'09". Owner: Sucesion Marquez. • Name: Gilberto Rivera well. AQUIFER.--Aymamon Limestone. WELL CHARACTERISTICS.--Abandoned unused water-table well, diameter 6 in (0.15 m), cased 6 in (0.15 m). DATUM.--Elevation of land-surface datum is 48.0 ft (14.63 m) above mean sea level. Measuring point: Air hole on pump base, 0.50 ft (0.15 m) above land-surface datum. REMARKS.--Observation well. Automatic recorder installed on October 16, 1985. PERIOD OF RECORD.--October 1985 to September 1986. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 50.00 ft (15.24 m) below land-surface datum, May 14, 1986; lowest water level recorded., 52.28 ft (15.93 m) below land-surface datum, Mar. 5-6, 19-20, 1986. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 51.34 51.62 51.94 52.08 52.05 52.05 51.76 51.34 51.96 52.08 52.02 2 51.39 51.65 51.95 52.13 52.08 52.03 51.74 51.39 51.98 52.11 51.98 3 51.45 51.69 51.95 52.13 52.10 52.01 51.35 51.39 51.99 52.13 51.99 4 51.48 51.73 51.91 52.11 52.16 52.02 51.10 51.43 51.99 52.15 52.01 5 51.43 51.68 51.91 52.14 52.20 52.01 50.96 51.45 51.98 52.11 51.99 6 51.42 51.66 51.92 52.13 52.19 52.03 50.93 51.52 51.97 52.08 51.98 7 51.43 51.65 51.91 52.13 52.15 52.04 50.95 51.56 51.98 52.05 51.98 8 51.41 51.63 51.90 52.12 52.11 52.02 50.97 51.58 51.98 52.03 52.03 9 51.39 51.63 51.90 52.13 52.14 51.94 51.00 51.60 51.99 52.02 52.08 10 51.38 51.63 51.89 52.13 52.13 51.91 51.03 51.61 52.00 52.02 52.18 11 51.36 51.65 51.88 52.11 52.13 51.92 51.04 51.61 51.99 52.04 52.22 12 51.39 51.67 51.87 52.12 52.11 51.94 51.06 51.64 51.99 52.07 52.21 13 51.31 51.75 51.87 52.13 52.14 51.95 51.10 51.62 51.99 52.14 52.21 14 51.32 51.81 51.88 52.13 52.14 51.95 50.94 51.65 52.00 52.14 52.18 15 51.25 51.83 51.91 52.15 52.16 51.95 50.87 51.65 51.99 52.10 52.16 16 51.29 51.10 51.86 51.94 52.11 52.18 51.97 50.84 51.66 52.00 52.12 52.10 17 51.40 50.98 51.86 51.96 52.12 52.15 51.98 50.88 51.69 52.01 52.11 52.03 18 51.44 51.01 51.87 51.96 52.15 52.18 51.97 50.92 51.69 52.01 52.10 52.01 19 51.49 51.07 51.85 51.97 52.14 52.20 51.96 50.98 51.69 52.01 52.07 52.02 20 51.53 51.14 51.88 51.96 52.08 52.22 51.94 51.04 51.70 52.00 52.04 52.02 21 51.53 51.16 51.89 51.97 52.05 52.21 51.90 51.08 51.70 51.93 52.02 52.04 22 51.52 51.18 51.87 51.99 52.04 52.16 51.87 51.13 51.66 51.92 51.99 52.06 23 51.49 51.19 51.86 51.99 52.05 52.09 51.83 51.18 51.63 51.93 51.96 52.10 24 51.47 51.21 51.86 51.97 52.03 52.07 51.78 51.23 51.95 51.97 51.96 52.14 25 51.44 51.25 51.85 51.95 52.02 52.05 51.76 51.25 51.95 51.98 51.95 52.12 26 51.34 51.43 51.87 51.95 51.98 52.07 51.79 51.26 51.93 51.99 51.99 52.19 27 51.29 51.49 51.90 51.94 51.98 52.07 51.83 51.30 51.93 52.02 52.05 52.24 28 51.27 51.56 51.91 51.96 52.00 52.04 51.89 51.32 51.94 52.03 52.09 52.25 29 51.29 51.59 51.95 51.99 52.05 51.77 51.33 51.96 52.04 52.09 52.22 30 51.31 51.61 51.93 52.00 52.05 51.74 51.33 51.96 52.03 52.05 52.23 31 51.32 51.92 52.04 52.05 51.34 52.05 52.04 LOW 51.61 51.95 52.04 52.15 52.22 52.05 51.76 51.96 52.05 52.15 52.25 HIGH 50.98 51.62 51.87 51.98 52.04 51.74 50.84 51.34 51.92 51.95 51.98 Br 50 1:12 < 51 z _It 6.110 52 53 OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1985 1986 307 GROUND-WATER LEVELS RIO GRANDE DE MANATI BASIN 182621066343300. Local number, 135 LOCATION.--Lat 18°26'21", long 66°34'33". Owner: Puerto Rica Land Authority. Name: Lederle. AQUIFER.--Limestone of Tertiary Age. WELL CHARACTERISTICS.--Drilled agricultural water-table well, diameter 24 in (0.61 m), cased 0-30 ft (0-9.1 m), diameter 16.62 in (0.42 m), cased to 0-450 ft (0-137.2 m). Depth 550 ft (167.6 m). DATUM.--Elevation of land-surface datum is 287 ft (87.48 m) above mean sea level, from topographic map. Measuring point: Top of shelter floor, 2.80 ft (0.85 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--November 1979 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 276.8 ft (84.38 m) below land-surface datum, Dec. 16, 1981; lowest war lev',1 recorded, 283.9 ft (86.55 m) below land-surface datum, May 3, 1984. WATER LEVEL, IN FEET BELOW LAND-SURFACE, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 283.46 282.93 282.97 283.31 283.41 283.40 283.42 283.11 282.40 282.84 283.11 283.09 2 283.49 282.94 282.99 283.30 283.46 283.44 283.41 283.08 282.42 282.87 283.13 283.08 3 283.52 282.98 283.01 283.29 283.48 283.46 283.40 282.77 282.45 282.89 283.14 283.09 4 283.54 283.00 283.03 283.26 283.48 283.52 283.39 281.20 282.48 282.90 283.15 283.11 5 283.55 282.95 283.01 283.25 283.52 283.54 283.39 280.62 282.53 282.90 283.15 283.12 6 283.53 282.92 282.99 283.27 283.53 283.56 283.40 280.90 282.57 282.90 283.15 283.12 7 283.38 282.91 282.96 283.29 283.55 283.55 283.42 281.20 282.61 282.91 283.14 283.12 8 283.03 282.90 282.96 283.32 283.55 283.53 283.40 281.42 282.67 282.93 283.14 283.14 9 282.88 282.88 282.97 283.33 283.56 283.53 283.32 281.60 282.70 282.95 283.14 283.15 10 282.84 282.89 283.01 283.34 283.55 283.54 283.24 281.74 282.74 282.98 283.14 283.22 11 282.84 282.91 283.07 283.33 283.54 283.53 283.23 281.81 282.75 282.98 283.14 283.23 12 282.83 282.94 283.10 283.30 283.53 283.53 283.23 281.94 282.77 282.98 283.15 283.21 13 282.81 282.93 283.15 283.28 283.53 283.53 283.25 281.99 282.78 282.96 283.16 283.19 14 282.81 282.92 283.19 283.26 283.53 283.54 283.24 281.93 282.79 282.96 283.15 283.16 15 282.85 282.83 283.19 283.27 283.52 283.53 283.26 281.71 282.79 282.94 283.17 283.16 16 282.89 282.71 283.20 283.28 283.52 283.55 283.28 281.53 282.78 282.93 283.13 283.16 17 282.96 282.47 283.19 283.30 283.49 283.54 283.30 281.53 282.78 282.93 283.12 283.15 18 283.00 282.40 283.19 283.31 283.52 283.54 283.30 281.59 282.79 282.92 283.13 283.14 19 283.01 282.40 283.17 283.32 283.52 283.56 283.28 281.64 282.79 282.96 283.13 283.15 20 283.03 282.43 283.18 283.32 283.52 283.59 283.25 281.78 282.80 283.01 283.14 283.16 21 283.03 282.48 283.20 283.34 283.48 283.60 283.22 281.82 282.82 283.04 283.14 283.18 22 283.02 282.53 283.20 283.37 283.46 283.57 283.18 281.95 282.82 283.07 283.13 283.20 23 283.01 282.56 283.20 283.38 283.46 283.53 283.15 282.00 282.81 283.11 283.12 283.23 24 283.00 282.61 283.22 283.38 283.45 283.51 283.13 282.11 282.85 283.11 283.11 283.24 25 282.99 282.68 283.23 283.37 283.44 283.47 283.12 282.16 282.87 283,11 283.09 283.22 26 282.95 282.73 283.26 283.36 283.38 283.47 283.13 282.21 282.86 283.10 283.09 283.23 27 282.92 282.80 283.30 283.36 283,36 283.48 283.15 282.29 282.85 283.13 283.12 283.25 28 282.87 282.87 283.33 283.36 283.37 283.45 283.17 282.34 282.86 283.12 283.13 283.26 29 282.88 282.92 283.35 283.38 283.44 283.15 282.37 282.86 283.11 283.13 283.24 30 282.90 282.95 283.34 283.38 283.44 283.13 282.38 282.85 283.11 283.12 283.25 31 282.91 283.31 283.39 283.43 282.39 283.10 283.10 LOW 283.55 283.00 283.35 283.39 283.56 283.60 283.42 283.11 282.87 283.13 283.17 283.26 HIGH 282.81 282.40 282.96 283.25 283.36 283.40 283.12 280.62 282.40 282.84 283.09 283.08 WTR YR 1986 MEAN 283 LOW 283.60 HIGH 280.62 277 9 lal Oa W o 279 14(.)•/ .4 281 _11z 1.4.) ci 283 Ix 5 W-3 285 ONDJFMAMJJ ASONDJ FMAMJJ ASONDJFMAMJJ AS 1983 1984 1985 1986 308 GROUND-WATER LEVELS RIO GRANDE DE MANATI BASIN 182757066325600. Local number, 206. LOCATION.--Lat 18°27'57", long 66°32'56". Owner: P.R. Department of Agriculture. Name: Plazuela No. 2. AQUIFER.--Aymamon Limestone. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 16 in (0.41 m), cased 16 in (0.41 m) 0-85 ft (0-25.9 m), open hole 85-101 ft (25.9-30.8 m). Depth 101 ft (30.8 m). DATUM.--Elevation of land-surface datum is about 7.0 ft (2.1 m) above mean sea level, from topographic map. Measuring point: Hole on side of casing, 1.30 ft (0.40 m) above land-surface datum. REMARKS.--Abandoned observation well. Automatic recorder installed on August 15, 1985. Estimated noon values: Jan. 5-8, Feb. 16-19. PERIOD OF RECORD.--October 1985 to September 1986. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 3.86 ft (1.18 m) below land-surface datum, May 16. 1986; lowest water level recorded, 5.47 ft (1.67 m) below land-surface datum, Mar. 12, 1986. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 5.20 4.68 4.80 5.08 5.20 5.15 5.24 4.92 4.58 4.92 4.99 2 5.23 4.68 4.83 5.08 5.20 5.17 5.23 4.89 4.60 4.94 5.02 3 5.27 4.68 4.84 5.10 5.20 5.24 5.22 4.39 4.61 4.96 5.05 4 5.31 4.68 4.82 5.11 5.20 5.25 5.22 4.07 4.64 4.97 5.07 5 5.31 4.68 4.80 5.11 5.20 5.25 5.21 4.01 4.68 4.96 5.09 6 5.27 4.68 4.77 5.11 5.20 5.25 5.22 4.02 4.71 4.95 7 4.77 4.68 4.77 5.10 5.20 5.29 5.24 4.06 4.75 4.97 8 4.55 4.68 4.78 5.10 5.20 5.28 5.22 4.09 4.78 4.97 9 4.56 4.68 4.80 5.10 5.20 5.30 5.08 4.13 4.80 4.99 10 4.61 4.68 4.83 5.10 5.20 5.37 5.05 4.15 4.82 5.01 11 4.64 4.68 4.89 5.09 5.20 5.37 5.06 4.17 4.82 5.00 12 4.61 4.68 4.95 5.08 5.20 5.37 5.08 4.25 4.85 4.99 13 4.58 4.68 4.98 5.06 5.20 5.39 5.10 4.21 4.84 4.99 14 4.57 4.68 4.99 5.08 5.20 5.34 5.10 3.94 4.86 4.99 15 4.60 4.68 5.01 5.11 5.20 5.34 5.12 3.88 4.85 4.98 16 4.65 4.68 4.99 5.13 5.21 5.31 5.14 3.89 4.86 4.98 17 4.72 4.68 4.98 5.13 5.23 5.32 5.15 3.94 4.87 4.99 18 4.76 4.67 5.00 5.15 5.25 5.38 5.14 4.02 4.87 4.99 19 4.81 4.67 5.02 5.14 5.27 5.36 5.12 4.09 4.88 4.99 20 4.84 4.67 5.01 5.16 5.28 5.35 5.10 4.16 4.89 4.99 21 4.84 4.67 5.01 5.20 5.24 5.34 4.98 4.23 4.91 4.94 22 4.83 4.67 5.01 5.20 5.24 5.33 4.96 4.29 4.89 4.93 23 4.81 4.67 5.03 5.20 5.23 5.33 4.96 4.33 4.87 4.92 24 4.78 4.67 5.07 5.20 5.21 5.34 4.95 4.40 4.90 4.92 25 4.74 4.67 5.12 5.20 5.28 5.36 4.93 4.45 4.92 4.92 26 4.65 4.59 5.13 5.20 5.22 5.34 4.96 4.49 4.89 4.93 27 4.61 4.66 5.13 5.20 5.19 5.42 4.99 4.53 4.90 4.93 28 4.60 4.72 5.10 5.20 5.20 5.42 5.02 4.56 4.91 4.97 29 4.62 4.75 5.10 5.20 --- 5.38 4.94 4.57 4.92 4.98 30 4.64 4.78 5.10 5.20 5.35 4.91 4.57 4.93 4.99 31 4.68 --- 5.10 5.20 5.39 --- 4.58 --- 4.97 LOW 5.31 4.78 5.13 5.20 5.28 5.42 5.24 4.92 4.93 4.92 HIGH 4.55 4.59 4.77 5.06 5.19 5.15 4.91 3.88 4.58 5.01 3 4 P\f` 5 6 OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1985 1986 309 GROUND-WATER LEVELS RIO GRANDE DE MANATI BASIN 182710066303700. Local number, 207. LOCATION.--Lat 18°27'10", long 66°30'37". Owner: P.R. Aqueduct and Sewer Authority. Name: Cantito La Luisa. AQUIFER.--Aymamon Limestone. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 20 in (0.51 m), cased 20 in (0.51 m) 0-30 ft (0-9.14 m), cased 10 in (0.25 m) 0-126 ft (0-38.4 m), perforated 80-126 ft (24.4-38.4 m). Depth 126 ft (38.4 m). DATUM.--Elevation of land-surface datum is about 59.0 ft (18.0 m) above mean sea level, from topographic map. Measuring point: Hole on side of casing, 2.00 ft (0.61 m) above land-surface datum. REMARKS.--Abandoned observation well. Automatic recorder installed on September 17,1985. PERIOD OF RECORD.--October 1985 to September 1986. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 36.38 ft (11.09 m) below land-surface datum, May 15, 1986; lowest wp'.r recorded, 89.83 ft (27.38 m) below land-surface datum, Oct. 5, 1985, WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 88.83 38.29 38.04 38.69 38.85 38.92 39.09 38.71 37.84 38.62 38.80 38.77 2 89.13 38.29 --- 38.71 38.86 38.96 39.09 38.71 37.89 38.63 38.83 38.76 3 89.43 38.29 38.73 38.87 39.00 39.09 37.95 37.91 38.65 38.85 38.77 4 89.63 38.29 38.74 38.87 39.01 39.10 37.78 37.95 38.66 38.86 38.80 5 89.83 37.85 38.74 38.89 39.04 39.08 37.87 37.99 38.67 38.87 38.81 6 89.43 37.92 38.75 38.92 39.06 39.08 37.92 38.03 38.69 38.87 38.82 7 80.93 37.97 38.78 38.95 39.08 39.09 37.94 38.08 38.69 38.87 38.84 8 76.33 38.00 38.86 38.97 39.08 39.09 37.93 38.11 38.72 38.87 38.85 9 77.03 38.01 38.88 38.99 39.09 38.94 37.93 38.15 38.75 38.87 38.87 10 79.43 38.05 38.84 39.00 39.09 38.91 37.95 38.19 38.78 38.87 38.90 11 80.03 38.08 --- 38.83 39.00 39.08 38.90 37.95 38.23 38.79 38.88 38.90 12 80.43 38.12 38.28 38.82 39.01 39.08 38.90 38.00 38.26 38.79 38.89 38.90 13 80.73 38.02 38.33 38.77 39.02 39.10 38.90 37.81 38.28 38.79 38.89 38.90 14 81.13 38.00 38.37 38.77 39.03 39.11 38.90 36.61 38.32 38.79 38.88 38.90 15 81.43 37.79 38.40 38.77 39.04 39.12 38.92 36.41 38.34 38.78 38.87 38.90 16 81.73 37.43 38.43 38.78 39.03 39.13 38.94 36.55 38.37 38.78 38.87 38.90 17 38.21 37.23 38.45 38.82 39.01 39.14 38.96 36.68 38.39 38.78 38.87 38.90 18 38.26 37.24 38.46 38.82 39.02 39.16 38.95 36.82 38.40 38.78 38.87 38.90 19 38.30 37.29 38.47 38.82 39.03 39.18 38.96 36.96 38.42 38.79 38.88 38.91 20 38.33 37.35 38.50 38.83 39.01 39.20 38.92 37.08 38.45 38.80 38.88 38.91 21 38.35 37.42 38.54 38.86 39.00 39.21 38.49 37.21 38.48 38.79 38.89 38.92 22 38.37 37.49 38.56 38.81 39.01 39.20 38.41 37.29 38.50 38.80 38.89 38.92 23 38.38 37.55 38.58 38.83 38.99 39.17 38.50 37.38 38.52 38.76 38.88 38.93 24 38.39 37.61 38.60 38.83 38.97 39.14 38.54 37.47 38.54 38.76 38.86 38.95 25 38.36 37.68 38.61 38.83 38.96 39.12 38.57 37.55 38.56 38.76 38.80 38.94 26 38.33 37.80 38.62 38.84 38.94 39.11 38.61 37.63 38.57 38.71 38.77 38.95 27 38.31 37.85 38.65 38.83 38.93 39.11 38.65 37.70 38.58 38.74 38.81 38.95 28 38.28 37.91 38.66 38.81 38.92 39.10 38.68 37.75 38.59 38.75 38.82 38.97 29 38.28 37.96 38.67 38.82 --- 39.07 38.68 37.81 38.60 38.76 38.81 38.96 30 38.27 38.00 38.68 38.82 39.07 38.69 37.84 38.61 38.76 38.80 38.96 31 38.28 --- 38.68 38.83 39.08 --- 37.87 --- 38.77 38.77 --- LOW 89.83 38.29 38.88 39.04 39.21 39.10 38.71 38.61 38.80 38.89 38.97 HIGH 38.21 37.23 38.69 38.85 38.92 38.41 36.41 37.84 38.62 38.77 38.76 92 36 ti4R Ugi 37 La ke; z 38 f ix 39 z 40 OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1985 1986 310 GROUND-WATER LEVELS RIO GRANDE DE MANATI BASIN 182534066283000. Local number, 208. LOCATION.--Lat 18°25'34", long 66°28'30". Owner: P.R. Aqueduct and Sewer Authority, Name: Acropolis Manati. AQUIFER.--Aguada Limestone. WELL CHARACTERISTICS.--Drilled water-table well, diameter 14 in (0.36 m), cased 1e in (0.36 m). Depth 235 ft (71.6 m). DATUM.--Elevation of land-surface datum is about 254 ft (77.4 m) above mean sea level, from topographic map. Measuring point: Hole on side of casing, 0.70 ft (0.21 m) above land-surface datum. REMARKS.--Abandoned observation well. Automatic recorder installed on January 8,1986. PERIOD OF RECORD.--January 1986 to September 1986. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 228.21 ft (69.56 m) below land-surface datum, May 18, 1986; lowest water level recorded, 238.14 ft (72.58 m) below land-surface datum, Aug. 8,1906. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 236.02 236.04 236.15 236.15 228.98 235.48 237.90 238.14 2 236.02 236.04 236.15 236.15 229.03 235.61 237.97 238.14 3 236.02 236.04 236.15 235.67 229.10 235.70 238.08 238.14 4 236.02 236.04 236.15 234.89 229.23 235.84 238.10 238.14 5 236.02 236.04 236.15 234.45 229.36 235.94 238.13 238.14 6 236.02 236.04 236.15 234.21 229.55 236.05 238.13 238.14 7 236.02 236.04 236.15 234.18 229.68 236.11 238.13 238.14 8 236.02 236.04 236.15 234.18 229.89 236.24 238.14 238.14 9 235.33 236.02 236.04 236.15 234.20 230.03 236.29 238.14 238.14 10 235.30 236.02 236.04 236.15 234.23 230.18 236.40 238.14 238.14 11 235.30 236.02 236.04 236.15 234.16 230.30 236.45 238.14 238.14 12 235.33 236.02 236.04 236.15 234.13 230.48 236.49 238.14 238.14 13 235.41 236.02 236.04 236.15 233.79 230.66 236.62 238.14 238.14 14 235.44 236.02 236.04 236.15 230.91 230.83 236.69 238.14 238.14 15 235.57 236.02 236.04 236.15 229.82 230.99 236.80 238.14 238.14 16 235.64 236.02 236.04 236.15 228.86 231.14 236.83 238.14 238.14 17 235.67 236.02 236.04 236.15 228.33 231.26 236.85 238.14 238.14 18 235.71 236.02 236.04 236.15 228.23 231.41 236.95 238.14 238.14 19 235.82 236.02 236.04 236.15 228.24 231.57 237.02 238.14 238.14 20 235.86 236.02 236.04 236.15 228.35 231.75 237.08 238.14 238.14 21 235.89 236.02 236.04 236.15 228.46 231.89 237.15 238.14 238.14 22 235.91 236.02 236.04 236.15 228.61 232.05 237.26 238.14 238.14 23 235.91 236.02 236.04 236.15 228.69 232.20 237.34 238.14 238.14 24 235.91 236.02 236.04 236.15 228.84 232.34 237.47 238.14 238.14 25 235.91 236.02 236.04 236.15 228.90 234.69 237.53 238.14 238.14 26 235.91 236.02 236.04 236.15 229.04 234.86 237.57 238.14 238.14 27 235.91 236.04 236.04 236.15 229.16 235.00 237.65 238.14 238.14 28 235.91 236.04 236.04 236.15 229.25 235.11 237.68 238.14 238.14 29 236.02 236.04 236.15 229.29 235.24 237.74 238.14 238.14 30 236.02 236.04 236.15 229.02 235.35 237.81 238.14 238.14 31 236.02 236.04 228.98 237.87 238.14 LOW 236.04 236.04 236.15 236.15 235.35 237.87 238.14 238.14 HIGH 236.02 236.04 236.15 228.23 228.98 235.48 237.90 238.14 9x La 220 co 0 225 Z < "".14•• 230 W 7) 235 240 A JAN FEB MAR APR MAY JUN JUL AUG SEP 1986 I 311 GROUND-WATER LEVELS RIO GRANDE DE MANATI BASIN 182634066262500. Local number, 209. LOCATION.--Lat 18°26'34", long 66°26'25". Owner: P.R. Aqueduct and Sewer Authority. Name: Coto Norte No. 3. AQUIFER.--Aymaaon-Aguada Limestone. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 16 in (0.41 m), cased 16 in (0.41 m) 0-495 ft (0-150.9 m), perforated 255-455 ft (77.7-138.7 m). Depth 495 FT (150.9 m). DATUM.--Elevation of land-surface datum is about 99.0 ft (30.2 a) above mean sea level, fro topographic map. Measuring point: Hole on side of casing, 2.30 ft (0.70 m) above land-surface datum. REMARKS.--Abandoned observation well. Automatic recorder installed on September 11,1985. PERIOD OF RECORD.--October 1985 to September 1986. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 71.50 ft (21.79 m) below land-surface datum, July 23, 1986; lowest water level recorded, 81.96 ft (24.98 a) below land-surface datum, June 24, 1986. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 81.81 80.20 78.88 81.14 81.57 81.48 81.83 81.56 78.59 80.99 79.66 79.80 2 81.82 80.34 79.05 81.17 81.57 81.50 81.83 81.02 78.83 --- 79.71 79.83 3 81.84 80.46 79.21 81.19 81.57 81.54 81.82 79.69 78.99 79.77 79.74 4 81.86 80.54 79.34 81.21 81.57 81.56 81.81 78.50 79.16 79.79 79.78 5 81.86 80.18 79.48 81.24 81.57 81.57 81.63 78.09 79.37 79.83 79.81 6 81.68 80.18 79.58 81.26 81.58 81.59 81.71 78.62 79.56 79.85 79.85 7 77.93 80.24 79.71 81.29 81.58 81.62 81.71 78.89 79.69 79.86 79.86 8 78.05 80.36 79.83 81.33 81.58 81.62 81.72 78.99 79.82 79.88 79.89 9 78.47 80.46 79.93 81.34 81.58 81.64 81.18 79.21 79.95 79.90 79.93 10 78.83 80.54 80.03 81.32 81.57 81.64 81.38 79.37 80.07 79.91 79.95 11 79.12 80.64 80.11 81.32 81.56 81.64 81.46 79.22 80.17 79.92 79.96 12 79.35 80.71 80.19 81.33 81.55 81.64 81.52 79.11 80.29 79.94 79.98 13 79.58 79.44 80.29 81.33 81.55 81.65 81.59 77.17 80.38 79.95 80.01 14 79.77 79.25 80.38 81.35 81.55 81.66 81.62 73.93 80.40 79.94 80.03 15 79.96 77.62 80.44 81.37 81.56 81.65 81.66 72.79 80.48 79.93 80.05 16 80.12 75.83 80.51 81.39 81.53 81.65 81.65 72.64 80.54 79.94 80.08 17 80.29 75.29 80.57 81.41 81.52 81.68 81.55 72.80 80.59 79.96 80.09 18 80.42 75.28 80.63 81.40 81.52 81.70 81.54 73.15 80.65 79.98 80.11 19 80.47 75.43 80.69 81.42 81.51 81.73 81.60 73.67 80.71 79.99 80.14 20 80.54 75.69 80.73 81.43 81.51 81.75 81.65 74.25 80.75 80.02 80.17 21 80.54 75.99 80.78 81.45 81.50 81.77 81.42 74.82 80.80 80.03 80.18 22 80.63 76.39 80.83 81.48 81.50 81.79 81.45 75.38 80.85 --- 80.03 80.19 23 80.69 76.74 80.86 81.49 81.49 81.78 81.19 75.90 80.89 --- 80.03 80.21 24 80.68 77.08 80.88 81.52 81.49 81.77 81.33 76.38 81.14 79.51 80.02 80.24 25 80.42 77.40 80.88 81.53 81.47 81.76 81.41 76.81 81.78 79.53 79.84 80.25 26 79.76 77.72 80.94 81.53 81.46 81.74 81.48 77.20 81.18 79.56 79.91 80.25 27 79.89 77.99 80.99 81.52 81.49 81.74 81.51 77.66 81.20 79.57 79.92 80.26 28 79.41 78.23 81.03 81.54 81.49 81.77 81.50 77.96 81.24 79.60 79.94 80.28 29 79.61 78.49 81.07 81.57 81.80 81.51 78.23 81.26 79.60 79.93 80.29 30 79.82 78.73 81.10 81.55 81.82 81.53 78.23 81.29 79.60 79.83 80.31 31 80.02 81.12 81.56 81.83 78.48 79.64 79.79 LOW 81.86 80.71 81.12 81.57 81.58 81.83 81.83 81.56 81.78 80.03 80.31 HIGH 77.93 75.28 78.88 81.14 81.46 81.48 81.18 72.64 78.59 79.66 79.74 65 9 ta 0 70 • C) - 75 W?) 80 I ex 3 85 OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1985 1986 312 GROUND-WATER LEVELS RIO GRANDE DE MANATI BASIN 182308066260400. Local number, 210. LOCATION.--Lat 18'23'08", long 66°26'04". Owner: Gelo Martinez. Name: Gelo Martinez well. AQUIFER.--Lares Limestone. WELL CHARACTERISTICS.--Grilled unused water-table well, diameter 8 in (0.20 m), cased 8 in (0.20 m). DATUM.--Elevation of land-surface datum is about 574 ft (174.9 m) above mean sea level, from topographic map. Measuring point: Hole on side of casing, 2.00 ft (0.61 m) above land-surface datum. REMARKS.--Abandoned observation well. Automatic recorder installed on February 27,1986. PERIOD OF RECORD.--October 1985 to September 1986. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 40.56 ft (12.36 m) below land-surface datum, May 22, 1986; lowest water level recorded, 67.67 ft (20.62 m) below land-surface datum, Apr. 6, 1986. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATION Water Water Water Water Date level Date level Date level Date level Oct. 31 49.00 Nov. 26 21.40 Jan. 8 49.03 Jan. 29 49.30 WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 62.52 67.11 62.68 44.20 49.06 50.04 54.51 2 62.52 67.29 62.33 44.95 49.05 50.48 54.73 3 62.87 67.38 51.86 45.78 49.05 51.36 54.76 4 63.14 67.55 48.97 46.53 49.05 52.42 53.42 5 63.83 67.63 48.03 47.26 49.04 53.53 53.21 6 64.23 67.67 48.14 47.80 49.04 54.77 54.08 7 64.66 67.61 48.44 48.26 49.04 55.92 55.14 8 65.01 67.51 48.41 48.65 49.05 57.00 56.32 9 65.27 67.46 48.26 48.91 49.06 57.99 57.60 10 65.49 67.43 47.97 49.02 49.05 58.80 58.93 11 65.66 67.43 47.61 49.04 49.06 59.42 59.70 12 65.77 66.95 47.51 49.04 49.07 59.80 60.42 13 65.87 66.79 47.24 49.04 49.07 60.01 60.97 14 65.93 66.69 46.15 49.04 49.07 59.97 61.67 15 66.02 66.67 45.13 49.03 49.07 59.49 62.10 16 53.11 66.04 66.67 43.83 49.04 49.06 58.95 17 66.09 66.71 42.92 49.04 49.05 58.69 62.41 18 66.13 66.81 42.17 49.04 49.05 58.76 62.51 19 66.17 66.75 41.49 49.04 49.06 59.21 62.59 20 66.23 66.68 41.03 49.04 49.04 59.78 62.66 21 66.28 66.58 40.75 49.04 49.06 60.33 62.74 22 66.35 66.31 40.60 49.03 49.07 60.97 62.81 23 66.42 65.96 40.59 49.03 49.10 61.58 62.87 24 66.46 63.05 40.69 49.04 49.13 62.06 62.97 25 66.53 62.58 40.86 49.04 49.15 62.09 63.14 26 66.61 62.48 41.13 49.04 49.20 61.25 63.45 27 62.23 66.67 62.53 41.49 49.04 49.20 60.45 63.71 28 62.38 66.77 62.62 41.92 49.04 49.20 60.08 63.90 29 66.86 62.66 42.39 49.05 49.19 59.91 64.08 30 66.91 62.71 42.91 49.05 49.25 58.67 64.21 31 66.91 43.53 49.63 55.87 LOW 66.91 67.67 62.68 49.05 49.63 62.09 64.21 HIGH 62.52 62.48 40.59 44.20 49.04 50.04 53.21 20 • 14( - Ls 0 40 Z< _rt4 La v. 60 Gl ce z dS SO FEB MAR APR MAY JUN JUL AUG SEP 1986 314 GROUND-WATER LEVELS RIO CIBUCO BASIN 182615066235300. Local number, 211. LOCATION.--Lat 18°26'15", long 66°23'53". Owner: P.R. Aqueduct and Sewer Authority. Name: Rosario No. 2. AQUIFER.--Aguada Limestone. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 14 in (0.36 m) C 200 ft (0-61.0 m), diameter 12 in (0.30 m) 200-250 ft (61.0-76.2 m), cased 12 in (0.30 m) 0-250 ft (0-76.2 m), perforated 210-250 ft (64.0-76.2 m), diameter 10 in (0.25 m) 250-270 ft (76.2-82.3 m), open hole; concrete sealed 0-200 ft (0-61.0 a). Depth 270 ft (82.3 m). DATUM.--Elevation of land-surface datum is about 215 ft (65.5 m) above mean sea level, from topographic map. Measuring point: Hole on side of casing, 1.15 ft (0.35 m) above land-surface datum. REMARKS.--Abandoned observation well. Automatic recorder installed on September 17,1985. PERIOD OF RECORD.--October 1985 to September 1986. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 191.29 ft (58.30 m) below land-surface datum, May 16, 1986; lowest water level recorded, 193.10 ft (58.86 m) below land-surface datum, Mar. 21, 1986. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 193.05 192.23 191.85 192.42 192.82 192.85 193.06 192.90 191.86 192.57 192.69 192.69 2 193.05 192.24 191.88 192.42 192.84 192.89 193.04 192.88 191.86 192.57 192.69 192.69 3 193.06 192.27 191.92 192.42 192.85 192.91 193.05 192.80 191.87 192.57 192.69 192.69 4 193.09 192.30 191.94 192.43 192.86 192.94 193.05 192.67 191.87 192.58 192.69 192.69 5 193.09 192.30 191.95 192.43 192.89 192.96 193.03 192.52 191.91 192.58 192.69 192.69 6 193.09 192.30 191.96 192.45 192.91 192.98 193.02 192.49 191.97 192.60 192.69 192.69 7 192.52 192.30 191.97 192.45 192.93 192.98 193.02 192.49 192.00 192.60 192.72 192.69 8 192.13 192.30 191.98 192.68 192.93 192.98 193.02 192.49 192.08 192.60 192.73 192.69 9 192.02 192.30 192.01 192.69 192.94 192.98 192.97 192.45 192.10 192.60 192.73 192.69 10 192.02 192.31 192.06 192.69 192.96 192.98 192.93 192.41 192.12 192.60 192.73 192.69 11 192.07 192.32 192.07 192.68 192.96 192.98 192.93 192.40 192.16 192.60 192.73 192.69 12 192.10 192.33 192.08 192.67 192.96 192.98 192.93 192.40 192.18 192.60 192.74 192.69 13 192.13 192.33 192.12 192.67 192.99 192.98 192.93 192.24 192.18 192.60 192.74 192.69 14 192.19 192.19 192.16 192.67 192.99 192.99 192.93 192.21 192.19 192.60 192.74 192.69 15 192.24 192.08 192.17 192.67 192.99 192.99 192.93 191.34 192.19 192.60 192.74 192.69 16 192.29 191.70 192.19 192.67 192.99 193.03 192.93 191.30 192.19 192.60 192.74 192.69 17 192.40 191.39 192.21 192.68 192.99 193.04 192.99 191.29 192.19 192.60 192.74 192.69 18 192.41 191.31 192.22 192.68 192.99 193.05 192.99 191.29 192.19 192.60 192.74 192.69 19 192.41 191.31 192.23 192.69 193.00 193.05 192.99 191.29 192.29 192.60 192.74 192.69 20 192.41 191.31 192.24 192.69 193.01 193.08 192.98 191.29 192.34 192.60 192.74 192.69 21 192.41 191.36 192.25 192.71 193.01 193.10 192.96 191.31 192.37 192.60 192.74 192.69 22 192.41 191.43 192.26 192.73 193.01 193.10 192.92 191.36 192.38 192.60 192.74 192.69 23 192.42 191.51 192.32 192.75 193.01 193.10 192.90 191.45 192.38 192.69 192.74 192.70 24 192.42 191.57 192.32 192.75 193.00 193.09 192.89 191.55 192.53 192.69 192.74 192.70 25 192.42 191.65 192.33 192.75 192.99 193.09 192.89 191.59 192.56 192.69 192.74 192.71 26 192.36 191.66 192.34 192.75 192.98 193.09 192.89 191.71 192.57 192.69 192.70 192.71 27 192.31 191.70 192.37 192.75 192.85 193.09 192.90 191.75 192.57 192.69 192.70 192.71 28 192.26 191.74 192.38 192.76 192.85 193.09 192.90 191.78 192.57 192.69 192.70 192.71 29 192.22 191.79 192.40 192.77 193.07 192.91 191.84 192.57 192.69 192.70 192.71 30 192.19 191.82 192.41 192.79 193.07 192.90 191.86 192.57 192.69 192.70 192.71 31 192.23 192.41 192.80 193.06 191.86 192.69 192.69 LOW 193.09 192.33 192.41 192.80 193.01 193.10 193.06 192.90 192.57 192.69 192.74 192.71 HIGH 192.02 191.31 191.85 192.42 192.82 192.85 192.89 191.29 191.86 192.57 192.69 192.69 WTR YR 1986 MEAN 193 LOW 193 10 HIGH 191 29 OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1985 1986 315 GROUND-WATER LEVELS RIO CIBUCO BASIN 182515066194000. Local number, 212. LOCATION.--Lat 18°25'15", long 66°19'40". Owner: U.S. Geological Survey. Name: Ponderosa TW-1. AQUIFER.--Aguada Limestone-Cibao Formation. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 4 in (0.10 m), cased 4 in (0.10 m) 0-136 ft (0-41.1 m), perforated 121-131 ft (36.9-39.9 m); bentonite packed 0.5-121 ft (0.15-36.9 m). Depth 136 ft (39.9 m). DATUM.--Elevation of land-surface datum is about 98.0 ft (29.9 m) above mean sea level, from topographic map. Measuring point: Shelter floor on top of 4 in (0.10 m) casing, 3.00 ft (0.91 m) above land-surface datum. REMARKS.--Observation well. Automatic recorder installed on October 17, 1985. PERIOD OF RECORD.--October 1985 to September 1986. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 64.00 ft (19.51 m) below land-surface datum, Dec. 1, 1985; lowest water level recorded, 73.79 ft (22.49 m) below land-surface datum, Sept. 29, 1986. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 66.17 64.19 65.37 66.74 68.18 70.31 72.37 68.56 67.99 68.42 69.30 2 66.17 64.22 65.39 66.78 67.08 71.09 71.06 68.73 68.05 68.49 69.22 3 66.17 64.27 65.42 66.82 68.53 71.06 70.48 68.84 68.09 68.53 69.16 4 66.14 64.25 65.46 66.86 68.97 70.84 70.18 68.91 68.12 68.57 69.11 5 66.09 64.29 65.49 66.90 69.37 70.66 69.90 68.19 68.16 68.60 69.07 6 66.03 64.32 65.51 66.94 69.71 70.53 69.73 68.91 68.20 68.67 69.05 7 66.02 64.38 65.53 66.98 69.95 70.42 69.63 67.28 68.21 68.70 69.03 8 66.02 64.38 65.86 67.02 70.20 70.34 69.49 67.20 68.25 68.74 69.02 9 66.03 64.40 65.90 67.06 70.27 70.27 69.35 67.17 68.28 68.78 69.01 10 66.03 64.50 65.95 67.11 70.51 70.21 69.24 67.08 68.32 68.81 68.95 11 66.03 64.50 65.95 67.14 70.73 70.15 69.05 66.96 68.35 68.79 68.95 12 66.03 64.50 65.96 67.18 70.90 70.09 68.88 66.91 68.35 68.82 68.99 13 65.99 64.50 65.99 67.23 71.05 70.06 68.69 66.98 63.22 68.84 71.05 14 65.94 64.50 66.02 67.28 71.19 70.03 68.20 67.05 68.22 68.84 71.29 15 65.94 64.50 66.07 67.28 71.32 69.93 67.79 67.10 68.24 68.84 71.44 16 65.29 64.50 66.10 67.29 71.46 69.89 67.50 67.17 68.25 68.84 71.84 17' 64.95 64.87 66.14 67.35 71.57 69.90 67.29 67.00 68.25 68.86 72.13 18 66.76 64.76 64.85 66.17 67.40 71.72 70.04 67.11 67.24 68.25 68.89 72.38 19 66.72 64.59 64.87 66.18 67.44 71.83 71.75 66.97 67.29 68.25 68.91 72.59 20 66.72 64.48 64.94 66.21 67.49 71.87 71.93 66.86 67.32 68.12 68.93 72.77 21 66.64 64.37 64.99 66.25 67.55 71.87 72.10 66.78 67.38 68.02 68.97 72.92 22 66.64 64.31 65.05 66.29 67.56 71.97 72.10 66.71 67.42 68.06 68.99 73.05 23 66.65 64.24 65.11 66.33 67.57 72.08 72.21 66.54 57.48 68.12 69.68 73.19 24 66.65 64.18 65.11 66.37 67.57 72.17 72.31 66.46 67.52 68.17 71.19 73.46 25 66.65 64.10 65.14 66.41 67.60 72.18 72.39 66.46 67.70 68.22 71.32 73.39 26 66.65 64.11 65.18 66.45 68.30 72.26 72.47 66.46 67.76 68.28 71.31 73.47 27 66.64 64.11 65.22 66.48 68.13 72.35 72.51 68.02 67.82 68.31 71.58 73.55 28 66.60 64.16 65.22 66.54 67.57 72.42 72.53 68.19 67.86 68.35 71.67 73.42 29 66.49 64.16 65.28 66.59 72.49 70.82 68.40 67.90 68.40 70.23 73.65 30 66.22 64.16 65.30 66.53 71.03 72.21 68.42 67.94 68.36 69.61 73.74 31 66.17 65.33 66.68 70.48 68.63 68.37 69.42 LOW 66.17 65.33 66.68 68.30 72.49 72.53 72.37 68.91 68.40 71.67 73.74 HIGH 64.10 64.19 65.37 66.74 67.08 69.89 66.46 66.91 67.99 68.42 68.95 OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1985 1986 316 GROUND-WATER LEVELS RIO CIBUCO BASIN 182330066185700. Local number, 213. LOCATION.--Lat 18°23'30", long 66°18'57". Owner: P.R. Aqueduct and Sewer Authority. Name: Pampano No. 2. AQUIFER.--Rio Indio Limestone-Lares Limestone. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 20 in (0.51 m), cased 20 in (0.51 m) 0-130 ft (0-39.6 m), diameter 14 in (0.36 m), cased 12 in (0.30 m) 0-220 ft (0-67.1 m); open hole 220-330 ft (67.6- 100.6 m). Depth 330 ft (100.6 m). DATUM.--Elevation of land-surface datum is about 394 ft (120 m) above mean sea level, from topographic map. Measuring point: Hole on side of casing, 2.95 ft (0.90 m) above land-surface datum. REMARKS.--Abandoned observation well. Automatic recorder installed on September 16, 1985. PERIOD OF RECORD.--October 1985 to September 1986. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 34.40 ft (10.50 m) below land-surface datum, Dec. 6, 1985; lowest water level recorded, 49.55 ft (15.10 m) below land-surface datum, May 1, 1986. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 47.17 40.55 34.62 37.26 40.39 45.09 47.96 49.54 43.13 43.03 44.69 46.42 2 47.21 40.48 34.62 37.36 40.44 45.19 47.05 49.49 43.01 43.08 44.78 46.09 3 47.30 40.48 34.61 37.50 40.49 45.35 47.17 49.38 42.90 43.12 44.87 46.19 4 47.33 40.47 34.59 37.60 40.65 45.47 47.29 49.32 42.75 43.19 44.92 46.19 5 47.32 40.48 34.57 37.76 40.79 45.58 47.33 49.11 42.80 43.24 44.97 46.25 6 47.18 40.50 34.55 37.88 40.88 45.64 47.37 49.00 42.82 43.33 45.03 46.25 7 46.21 40.51 34.60 37.96 40.97 45.79 47.34 48.84 42.76 43.38 45.05 46.31 8 45.08 40.55 34.67 38.07 41.03 45.96 47.34 48.50 42.76 43.44 45.08 46.34 9 44.47 40.56 34.72 38.19 41.12 46.10 47.57 48.32 42.82 43.53 45.16 46.39 10 44.00 40.56 34.79 38.28 41.19 46.17 47.71 48.13 42.88 43.55 45.21 46.08 11 43.63 40.51 34.84 38.33 41.30 46.18 47.80 47.81 42.93 43.57 45.30 46.19 12 43.33 40.51 34.91 38.42 41.40 46.29 47.87 47.40 42.95 43.61 44.93 46.27 13 43.12 40.39 34.97 38.51 41.46 46.39 47.94 47.10 42.91 43.72 45.31 46.40 14 42.97 40.18 35.03 38.61 41.52 46.46 48.03 46.26 42.92 43.76 45.39 46.45 15 42.90 39.68 35.12 38.76 42.37 46.53 48.14 45.41 43.01 43.75 45.43 46.53 16 42.90 38.75 35.22 38.82 42.66 46.61 48.25 44.83 43.00 43.81 45.50 46.55 17 42.78 37.93 35.32 38.91 42.91 46.72 48.36 44.15 42.88 43.87 45.61 46.56 18 42.74 37.43 35.42 38.98 42.91 46.82 48.48 44.09 42.81 43.94 45.70 46.62 19 42.64 36.93 35.53 39.09 43.05 46.94 48.53 43.89 42.80 43.98 45.77 46.68 20 42.55 36.43 35.72 39.17 43.19 46.90 48.68 43.84 42.79 44.02 45.85 46.72 21 42.37 36.03 35.86 39.30 43.30 46.95 48.77 43.78 42.75 44.11 45.89 46.73 22 42.25 35.72 35.99 39.40 43.42 47.08 48.84 43.73 42.73 44.24 45.89 46.74 23 42.06 35.42 36.11 39.49 43.62 47.22 48.93 43.68 42.76 44.27 45.89 46.76 24 41.92 35.18 36.29 39.57 43.59 47.32 49.01 43.69 42.69 44.25 46.01 46.74 25 41.68 35.20 36.40 39.65 43.63 47.41 49.09 43.63 42.72 44.31 46.14 46.88 26 41.54 35.07 36.59 39.75 43.77 47.51 49.16 43.62 42.78 44.41 46.25 46.91 27 41.38 34.94 36.69 39.84 44.00 47.58 49.22 43.68 42.81 44.41 46.31 46.91 28 41.17 34.86 36.80 39.98 45.01 47.68 49.32 43.63 42.84 44.45 46.33 46.98 29 40.91 34.81 36.88 40.07 47.80 49.35 43.57 42.90 44.53 46.41 47.05 30 40.75 34.69 37.00 40.14 47.85 49.45 43.43 42.35 44.59 46.46 47.11 31 40.64 37.15 40.26 47.94 43.29 44.64 46.43 LOW 47.33 40.56 37.15 40.26 45.01 47.94 49.45 49.54 43.13 44.64 46.46 47.11 HIGH 40.64 34.69 34.55 37.26 40.39 45.09 47.05 43.29 42.69 43.03 44.69 46.08 25 35 45 55 OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1985 1956 317 GROUND-WATER LEVELS RIO DE LA PLATA BASIN 182746066170800. Local number, 214. LOCATION.--Lat 18°27'46", long 66°17'08". Owner: Dorado Beach Hotel. Name: Dorado Beach No. 7. AQUIFER.--Aymamon Limestone. WELL CHARACTERISTICS.--Drilled water-tabble well, diameter 18 in (0.46 m). Depth 100 ft (30.5 m). DATUM.--Elevation of land-surface datum is about 39.0 ft (11.9 m) above mean sea level, from topographic map. Measuring point: Hole on side of casing, 1.10 ft (0.34 m) above land-surface datum. REMARKS.--Abandoned observation well. Automatic recorder installed on November 7,1985. Water levels affected by nearby pumping well. PERIOD OF RECORD.-- November 1985 to September 1986. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 18.23 ft (5.56 m) below land-surface datum, Nov. 16, 1985; lowest water level recorded, 20.12 ft (6.13 m) below land-surface datum, Mar. 19, 1986. WATER LEVEL, IN FEE' BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 19.00 19.45 19.62 19.70 19.83 19.77 19.38 19.78 19.97 19.71 2 19.07 19.47 19.64 19.76 19.84 19.69 19.42 19.82 20.00 19.65 3 19.14 19.47 19.61 19.77 19.83 19.67 19.43 19.82 20.02 19.69 4 19.18 19.46 19.60 19.80 19.85 19.70 19.49 19.83 20.01 19.68 5 19.14 19.47 19.62 19.85 19.84 19.64 19.54 19.81 19.97 19.62 6 19.15 19.47 19.61 19.82 19.84 19.68 19.58 19.79 19.89 19.62 7 19.10 19.12 19.45 19.64 19.79 19.85 19.64 19.62 19.81 19.83 19.64 8 19.10 19,12 19.36 19.61 19.77 19.84 19.55 19.65 19.80 19.85 19.70 9 19.10 19.08 19.35 19.64 19.79 19.78 19.53 19.62 19.79 19.85 19.79 10 19.07 19.08 19.28 19.65 19.79 19.76 19.54 19.62 19.80 19.88 19.86 11 19.01 19.04 19.26 19.66 19.80 19.76 19.46 19.62 19.78 19.92 19.87 12 18.99 19.06 19.29 19.68 19.79 19.78 19.45 19.64 19.74 19.94 19.87 13 18.80 19.13 19.34 19.71 19.84 19.77 19.40 19.60 19.78 19.97 19.91 14 18.76 19.17 19.37 19.72 19.84 19.78 18.74 19.52 19.79 19.96 19.94 15 18.54 19.22 19.44 19.75 19.85 19.79 19.02 19.63 19.81 19.96 19.92 16 18.29 19.29 19.46 19.70 19.88 19.82 19.05 19.66 19.84 19.99 19.85 17 18.46 19.30 19.45 19.72 19.87 19.83 19.08 19.68 19.84 19.98 19.75 18 18.6! 19.32 19.45 19.73 19.91 19.87 19.12 19.69 19.84 19.96 19.73 19 18.71 19.32 19.44 19.69 19.95 19.85 19.11 19.72 19.85 19.92 19.76 20 18.75 19.39 19.40 19.63 19.99 19.87 19.16 19.76 19.83 19.89 19.75 21 18.78 19.36 19.44 19.59 19.94 19.84 19.20 19.75 19.71 19.88 19.77 22 18.81 19.31 19.45 19.58 19.89 19.83 19.22 19.69 19.72 19.77 19.82 23 18.80 19.31 19.43 19.60 19.84 19.85 19.23 19.68 19.69 19.73 19.85 24 18.79 19.31 19.40 19.59 19.83 19.86 19.26 19.70 19.66 19.75 19.89 25 18.82 19.29 19.37 19.59 19.79 19.84 19.27 19.70 19.67 19.72 19.90 26 18.84 19.34 19.39 19.55 19.84 19.85 19.27 19.71 19.73 19.79 19.94 27 18.90 19.37 19.40 19.57 19.84 19.85 19.31 19.71 19.80 19.86 19.98 28 18.93 19.37 19.47 19.62 19.79 19.85 19.31 19.73 19.82 19.92 19.99 29 18.97 19.41 19.52 19.83 19.83 19.33 19.77 19.86 19.91 19.95 30 18.97 19.40 19.52 19.85 19.79 19.32 19.79 19.89 19.79 19.90 31 19.42 19.58 19.86 19.36 19.94 19.73 LOW 19.42 19.58 19.75 19.99 19.87 19.77 19.79 19.94 20.02 19.99 HIGH 19.00 19.26 19.55 19.70 19.76 18.74 19.38 19.66 19.72 19.62 18 18.5 ict4 1- 4c tao 19 0 Z 4( 19.5 LaJ 20 cr -1 20.5 W NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1985 1986 318 GROUND-WATER LEVELS RIO DE LA PLATA BASIN 182548066171200. Local number, 215. LOCATION.--Lat 18'25'48", long 66'17'12". Owner: P.R. Aqueduct and Sewer Authority. Name: Maguayo No. 5. AQUIFER.--Aguada Limestone-Cibao Formation. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 20 in (0.51 m) 0-95 Pt (0-29.0 m), cased 20 in (0.51 m) 0-60 ft (0-18.3 m), diameter 16 in (0.41 m) 95-145 ft (29.0-44.2 m), cased 16 in (.0.41 m) 0-145 ft (0-44.2 m), perforated 65-145 ft (19.8-44.2 m). Depth 145 ft (44.2 m). DATUM.--Elevation of land-surface datum is about 66 ft (20.1 m) above mean sea level, from topographic map. Measuring point: Hole on side of casing, 1.60 ft (0.49 m) above land-surface datum. REMARKS.--Abandoned observation well. Automatic recorder installed on August 13, 1985. PERIOD OF RECORD.--October 1985 to September 1986. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 40.89 ft (12.46 m) below land-surface datum, Nov. 20, 1985; lowest water level recorded, 44.25 ft (13.49 m) below land-surface datum, Oct. 1, 1985. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 44.25 41.91 41.58 42.51 42.97 43.49 44.07 44.03 42.14 43.27 43.62 43.47 2 44.22 41.95 41.64 42.53 42.99 43.50 44.00 43.97 47.20 43.29 43.63 43.44 3 44.22 42.00 41.69 42.55 43.01 43.53 44.02 43.93 42.24 43.32 43.65 43.42 4 44.22 42.02 41.73 42.56 43.03 43.56 44.02 43.92 42.29 43.35 43.67 43.42 5 44.20 42.03 41.77 42.58 43.04 43.58 44.02 43.88 42.36 43.37 43.68 43.44 6 44.13 42.05 41.79 42.60 43.05 43.61 43.98 43.83 42.43 43.39 43.69 43.46 7 43.62 42.06 41.83 42.62 43.07 43.63 43.98 43.79 42.47 43.40 43.71 43.46 8 43.62 42.09 41.88 42.64 43.09 43.66 43.99 43.72 42.53 43.42 43.72 43.48 9 42.07 42.14 41.91 42.66 43.10 43.69 43.97 43.67 42.57 43.44 43.74 43.49 10 41.58 42.17 41.94 42.63 43.12 43.71 43.95 43.60 42.62 43.47 43.74 43.51 11 41.29 42.20 41.95 42.62 43.14 43.72 43.95 43.51 42.67 43.48 43.75 43.54 12 41.12 42.22 41.99 42.62 43.17 43.74 43.95 43.40 42.72 43.44 43.75 43.56 13 41.07 42.13 42.01 42.63 43.19 43.76 43.96 43.27 42.75 43.43 43.73 43.59 14 41.09 42.04 42.03 42.64 43.21 43.77 43.98 42.70 42.77 43.44 43.71 43.63 15 41.15 41.86 42.06 42.67 43.23 43.78 44.00 42.29 42.80 43.44 43.71 43.66 16 41.26 41.49 t2.09 42.68 43.25 43.79 44.01 41.89 42.83 43.43 43.71 43.68 17 41.36 41.24 42.11 42.69 43.28 43.81 44.02 41.55 42.85 43.42 43.72 43.70 18 41.46 41.02 42.13 42.70 43.30 43.84 44.03 41.38 42.88 43.43 43.74 43.72 19 41.53 40.92 42.14 42.71 43.32 43.86 44.04 41.30 42.90 43.44 43.75 43.75 20 41.61 40.90 42.18 42.72 43.33 43.88 44.06 41.29 42.94 43.45 43.77 43.77 21 41.68 40.92 42.22 42.74 43.35 43.90 44.06 41.33 42.98 43.47 43.78 43.79 22 41.74 40.96 42.24 42.77 43.36 43.92 44.06 41.39 43.01 43.48 43.79 43.82 23 41.83 41.02 42.27 42.79 43.40 43.94 44.07 41.49 43.04 43.49 43.80 43.83 24 41.87 41.07 42.29 42.80 43.41 43.97 44.07 41.59 43.08 43.51 43.81 43.86 25 41.90 41.22 42.31 42.81 43.43 43.98 44.08 41.66 43.11 43.51 43.80 43.89 26 41.88 41.29 42.33 42.84 43.44 43.99 44.08 41.73 43.15 43.53 43.79 43.90 27 41.86 41.35 42.37 42.85 43.46 44.00 44.09 41.82 43.17 43.54 43.78 43.91 28 41.85 41.42 42.41 42.87 43.48 44.01 44.10 41.88 43.19 43.56 43.78 43.93 29 41.86 41.48 42.43 42.90 44.02 44.11 41.95 43.22 43.57 43.73 43.94 30 41.87 41.53 42.46 42.91 44.03 44.08 42.02 43.25 43.59 43.61 43.96 31 41.88 42.49 42.94 44.05 42.07 43.60 43.52 LOW 44.25 42.22 42.49 42.94 43.48 44.05 44.11 44.03 43.25 43.60 43.81 43.96 HIGH 41.07 40.90 41.58 42.51 42.97 43.49 43.95 41.29 42.14 43.27 43.52 43.42 WTR YR 1986 MEAN 43.0 LOW 44.25 HIGH 40.90 40 42 44 46 OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1985 1986 319 GROUND-WATER LEVELS RIO DE LA PLATA BASIN 182530066135400. Local number, 216. LOCATION.--Lat 18°25'30", long 66°13'54". Owner: P.R. Aqueduct and Sewer Authority. Name: Pozo Navy-Campanillas. AQUIFER.--Aguada Limestone. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 16 in (0.41 m) 0-106 ft (0-32.3 m), cased 16 in (0.41 m) 0-20 ft (0-6.10 m), cased 12 in (0.30 m) 0-106 ft (0-32.3 m), perforated 20-106 ft (6.10-32.3 m), diameter 10 in (10.25 m) 106-140 ft (32.3-42.7 m), cased 10 in (0.25 m) 106-140 ft (32.3-42.7 m), perforated 106-140 ft (32.3-42.7 m). Depth 140 ft (42.7 m). DATUM.--Elevation of land-surface datum is about 13.0 ft (3.96 m) above mean sea level, from topographic map. Measuring point: Hole on side of casing, 1.80 ft (0.55 m) above land-surface datum. REMARKS.--Abandoned observation well. Automatic recorder installed on August 13, 1985. PERIOD OF RECORD.--October 1985 to September 1986. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 10.17 ft (3.10 m) below land-surface datum, Nov. 21, 1985; lowest water level recorded, 14.72 ft (4.49 m) below land-surface datum, Apr. 28, 1986. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 14.35 11.70 11.34 12.42 13.22 13.97 14.54 14.51 11.68 12.93 13.12 13.29 2 13.46 11.79 11.38 12.46 13.24 14.00 14.54 14.11 11.70 12.96 13.15 13.28 3 14.02 11.88 11.43 12.47 13.23 14.02 14.54 13.96 11.72 12.98 13.20 13.32 4 14.13 11.92 11.46 12.47 13.25 14.06 14.51 13.99 11.76 13.02 13.22 13.37 5 14.02 11.54 10.92 12.50 13.26 14.11 14.47 13.95 11.81 13.03 13.25 13.40 6 13.90 11.40 11.43 12.53 13.25 14.13 14.42 13.88 11.86 13.01 13.26 13.42 7 11.28 11.40 11.48 12.55 13.33 14.16 14.42 13.71 11.93 13.03 13.28 13.45 8 11.23 11.41 11.53 1 2.60 13.37 14.20 14.44 13.53 11.92 13.06 13.30 13.48 9 11.37 11.42 11.55 12.54 13.40 14.24 14.38 13.46 12.07 13.08 13.33 13.54 10 11.48 11.91 11.58 12.53 13.43 14.24 14.34 13.38 12.23 13.10 13.35 13.62 11 11.56 11.96 11.62 12.52 13.46 14.25 14.35 13.21 12.27 13.09 13.36 13.65 12 11.62 11.98 11.67 12.54 13.50 14.27 14.36 13.15 ".34 '2.86 13.38 13.65 13 11.65 11.86 11.73 12.57 13.53 14.30 14.38 12.81 ...37 .2.85 13.31 13.70 14 11.67 11.77 11.79 12.60 13.57 14.32 14.40 11.97 12.37 12.86 13.25 13.73 15 11.73 11.42 11.84 12.65 13.61 14.36 14.45 11.89 12.40 12.80 13.13 13.73 16 11.80 10.96 11.72 12.67 13.64 14.39 14.48 12.00 12.29 12.76 13.09 13.77 17 11.85 10.82 11.66 12.68 13.66 14.36 14.51 12.05 12.39 12.73 13.25 13.77 18 11.63 10.85 11.84 12.65 13.69 14.40 14.54 12.03 12.46 12.74 13.42 13.85 19 11.78 10.87 11.92 12.72 13.70 14.44 14.57 12.03 12.53 12.76 13.42 13.85 20 11.78 10.89 11.97 12.74 13.72 14.43 14.58 11.93 12.58 12.76 13.44 13.91 21 11.77 10.74 11.97 12.80 13.74 14.48 14.53 11.87 12.64 12.78 13.49 13.90 22 11.83 10.85 11.81 12.85 13.78 14.50 14.53 11.87 12.66 12.84 13.50 13.89 23 11.86 10.92 11.87 12.89 13.81 14.57 14.55 11.92 12.70 12.87 13.49 13.89 24 11.76 10.98 12.05 12.92 13.83 14.55 14.57 11.96 12.75 12.88 13.51 14.00 25 11.75 11.00 12.12 12.93 13.85 14.51 14.65 12.01 12.79 12.92 13.52 13.98 26 11.78 11.09 12.20 12.97 13.87 14.51 14.65 12.04 12.83 12.96 13.47 13.94 27 11.66 11.15 12.27 12.99 13.91 14.52 14.67 12.05 12.88 12.99 13.61 14.02 28 11.67 11.23 12.30 13.04 13.94 14.50 14.67 11.85 12.87 13.04 13.58 14.02 29 11.73 11.27 12.34 13.10 14.51 14.69 11.83 12.89 13.08 13.25 13.97 30 11.78 11.30 12.38 13.14 14.53 14.61 11.71 12.91 13.11 13.30 14.00 31 11.59 12.42 13.17 14.54 11.70 13.12 13.28 LOW 14.35 11.98 12.42 13.17 13.94 14.57 14.69 14.51 12.91 13.12 13.61 14.02 HIGH 11.23 10.74 10.92 12.42 13.22 13.97 14.34 11.70 11.68 12.73 13.09 13.28 WTR YR 1986 MEAN 12.9 LOW 14.69 HIGH 10.74 OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1985 1986 320 GROUND-WATER LEVELS RIO DE LA PLATA BASIN 182655066142400. Local number, 217. LOCATION.--Lat 18°26'55", long 66°14'24". Owner: U.S. Geological Survey. Name: Monserrate TW-2. AQUIFER.-Alluvial Deposits. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 4 in (0.10 m), cased 4 in (0.10 m) 0-80 ft (0-24.4 m), perforated 10-80 ft (3.05-24.4 m). Depth 80 ft (24.4 m). DATUM.--Elevation of land-surface datum is about 3.30 ft (1.00 m) above mean sea level, from topographic map. Measuring point: Top of shelter floor, 3.50 ft (1.07 m) above land-surface datum. REMARKS.--Observation well. Automatic recorder installed on August 20, 1985. PERIOD OF RECORD.--November 1985 to September 1986. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 0.02 ft (0.006 m) below land-surface datum, May 16, 1986; lowest water level recorded, 1.92 ft (0.58 m) below land-surface datum, Apr. 12, 1986. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 .72 1.11 1.26 1.51 1.75 1.62 .77 1.26 1.42 1.24 2 .77 1.09 1.28 1.54 1.75 1.32 .77 1.30 1.46 1.23 3 - .82 1.09 1.29 1.57 1.74 1.25 .78 1.29 1.49 1.29 4 .83 1.04 1.25 1.61 1.73 1.29 .83 1.31 1.49 1.32 5 .76 1.04 1.27 1.65 1.70 1.32 .84 1.32 1.47 1.33 6 .72 1.06 1.29 1.68 1.67 1.36 .90 1.31 1.44 1.33 7 .71 .96 1.33 1.68 1.68 1.30 .96 1.30 1.44 1.34 8 .73 1.01 1.33 1.66 1.68 1.13 1.01 1.32 1.44 1.39 9 .73 .95 1.36 1.69 1.66 1.09 1.09 1.32 1.45 1.45 10 .74 .90 1.37 1.68 1.57 1.07 1.07 1.35 1.46 1.52 11 .75 .87 1.36 1.68 1.59 .95 .90 1.33 1.49 1.52 12 .77 .92 1.37 1.67 1.60 .92 .96 1.19 1.49 1.51 13 .85 .95 1.38 1.70 1.61 --- .95 1.18 1.45 1.52 14 .91 .96 1.40 1.70 1.62 1.01 1.22 1.41 1.53 15 .93 1.00 1.42 1.68 1.66 1.01 1.20 1.37 1.55 16 .96 1.01 1.42 1.73 1.69 --- 1.03 1.21 1.42 1.54 17 .89 1.01 1.42 1.73 1.72 .15 1.07 1.21 1.44 1.51 18 .85 1.01 1.45 1.75 1.75 .30 1.04 1.23 1.46 1.53 19 .85 1.04 1.45 1.78 1.74 .40 1.09 1.26 1.47 1.55 20 .89 1.06 1.44 1.82 1.74 .47 1.11 1.27 1.50 1.56 21 .91 1.13 1.43 1.84 1.70 .46 1.13 1.23 1.54 1.58 22 .89 1.18 1.45 1.83 1.67 .52 1.1 7 1.25 1.54 1.58 23 .88 1.17 1.47 1.78 1.69 .56 1.18 1.26 1.47 1.59 24 .93 1.17 1.47 1.81 1.70 .58 1.16 1.23 1.49 1.70 25 .95 1.14 1.45 1.74 1.74 .68 1.21 1.25 1.44 1.68 26 .53 1.03 1.16 1.43 1.72 1.77 .73 1.19 1.30 1.48 1.70 27 .59 1.05 1.16 1.43 1.73 1.78 .77 1.22 1.34 1.50 1.69 28 .65 1.05 1.21 1.50 1.68 1.79 .80 1.23 1.36 1.49 1.70 29 .69 1.08 1.23 --- 1.69 1.80 .81 1.26 1.40 1.40 1.67 30 .69 1.08 1.23 1.71 1.71 .84 1.28 1.41 1.28 1.67 31 --- 1.10 1.23 1.76 --- .81 --- 1.41 1.25 --- LOW 1.10 1.23 1.50 1.84 1.80 1.28 1.41 1.54 1.70 HIGH .71 .87 1.25 1.51 1.57 .77 1.18 1.25 1.23 0.5 1.5 2 NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 19$5 1986 321 GROUND-WATER LEVELS RIO HONDO TO RIO PUERTO NUEVO BASINS 182623066111000. Local number, 218. LOCATION.--Lat 18°26'23", long 66°11'10". Owner: P.R. Aqueduct and Sewer Authority. Name: Levittown No. 7. AQUIFER.--Alluvial deposits-Aymamon Limestone. WELL CHARACTERISTICS.--Drilled water-table well. DATUM.--Elevation of land surface datum is about 10.0 ft (3.05 m) above mean sea level, from topographic map. Measuring point: Hole on pump base, 1.55 ft (0.47 m) above land-surface datum. REMARKS.--Abandoned observation well. Automatic recorder installed August 13, 1985. PERIOD OF RECORD.--October 1985 to September 1986. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 6.52 ft (199 m) below land-surface datum, Oct. 9, 1985; lowest water level recorded, 9.77 ft (2.98 m) below land-surface datum, Mar. 23, 1986. WATER 'LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 8.22 7.23 8.00 7.75 8.63 8.95 8.86 9.36 7.39 7.58 1.77 7.90 2 8.13 7.27 8.03 7.75 8.65 8.99 8.84 8.90 7.37 7.60 7.86 7.86 3 8.17 7.34 8.07 7.76 8.62 8.98 8.85 8.63 7.35 7.60 7.93 7.87 4 8.20 7.37 8.09 7.75 8.63 8.99 8.76 8.74 7.35 7.62 7.97 7.86 5 8.22 7.32 8.09 7.76 8.64 9.03 8.66 8.81 7.37 7.71 7.87 7.87 6 8.11 7.33 8.09 7.76 8.65 9.04 8.62 8.79 8.02 7.73 7.82 7.85 7 7.08 7.32 8.11 7.77 8.66 9.04 8.61 8.69 8.34 7.75 7.82 7.86 8 6.66 7.31 8.12 7.75 8.69 9.05 8.61 8.65 8.37 7.68 7.81 7.90 9 6.60 7.50 8.11 7.75 8.72 9.07 9.17 7.84 8.26 7.66 7.87 8.00 10 6.62 7.30 8.12 7.73 8.71 8.94 8.59 7.73 8.33 7.68 7.96 8.00 11 6.68 7.27 8.14 7.96 8.74 9.07 8.56 7.65 8.33 7.66 8.00 8.00 12 6.70 7.28 8.16 7.76 8.76 9.07 8.59 7.59 8.37 7.64 7.94 8.00 13 6.74 7.24 8.17 7.76 8.77 9.11 8.59 7.46 8.38 7.69 7.91 8.02 14 6.78 7.22 8.16 7.77 8.79 9.11 8.58 7.03 8.43 7.72 7.87 8.02 15 6.85 7.14 8.17 7.82 8.83 9.13 8.60 6.89 8.46 7.62 7.84 8.03 16 6.95 7.05 8.17 7.82 8.83 9.17 8.63 6.84 8.50 7.61 8.24 8.04 17 7.04 7.32 7.93 7.83 8.84 9.15 8.63 6.86 8.53 7.58 8.18 8.01 18 7.14 7.34 7.80 7.83 8.84 9.15 8.67 6.89 8.58 7.58 8.27 8.01 19 7.19 7.48 7.74 8.23 8.83 9.14 8.68 6.91 7.86 7.63 8.51 8.02 20 7.21 7.55 7.72 8.29 8.83 9.20 8.66 6.96 7.82 7.72 8.86 8.03 21 7.22 7.59 7.94 8.33 8.81 9.20 8.61 7.01 7.80 7.73 8.99 8.04 22 7.26 7.16 7.69 8.38 8.83 9.19 8.58 7.10 7.77 7.64 8.42 8.06 23 7.26 7.60 7.66 8.41 8.85 9.67 8.58 7.95 7.78 7.62 8.95 8.09 24 7.24 7.65 7.65 8.42 8.85 9.70 8.58 8.12 7.67 7.58 9.04 8.09 25 7.23 7.69 7.64 8.44 8.84 9.05 9.16 8.22 7.59 7.59 8.25 8.11 26 7.22 7.74 7.67 8.47 8.82 9.00 9.27 8.33 7.58 7.69 8.17 8.14 27 7.20 7.82 7.70 8.48 8.87 8.99 9.30 8.36 7.56 7.78 8.14 8.15 28 7.18 7.90 1.69 8.54 8.90 8.94 9.30 8.43 7.58 7.82 8.09 8.15 29 7.21 7.93 7.72 8.56 --- 8.95 9.32 7.63 7.59 7.75 8.03 8.14 30 7.23 7.96 7.72 8.58 8.94 9.37 7.49 7.61 7.76 7.98 8.14 31 7.22 --- 7.73 8.57 8.89 --- 7.48 --- 7.75 7.93 --- LOW 8.22 7.96 8.17 8.58 8.90 9.70 9.37 9.36 8.58 7.82 9.04 8.15 HIGH 6.60 7.05 7.64 7.73 8.62 8.89 8.56 6.84 7.35 7.58 7.77 7.85 WTR YR 1986 MEAN 8.07 LOW 9.70 HIGH 6.60 SEP OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG 1985 1p86 322 GROUND-WATER LEVELS RIO HONDO TO RIO PUERTO NUEVO BASINS 182441066082600. Local number, 219. LOCATION.--Lat 18°24'41", long 66°08'26". Owner: Department of Defense. Name: Ft. Buchanan No. 1, Buchanan Park well. AQUIFER.--Cibao Formation. WELL CHARACTERISTICS.--Drilled water-table well, diameter 10 in (0.25 m), cased 10 in (0.25 m) 0-270 ft (0-82.3 m), perforated 46-685 ft (14.0-20.7 m), 88-120 ft (26.8-36.6 m), 160-191 ft (48.8-58.2 m), 240-270 ft (73.2-82.3 m). Depth 270 ft (82.3 m). DATUM.--Elevation of land-surface datum is about 66.0 ft (20.1 m) above mean sea level, from topographic map. Measuring point: Hole on side of casing, 0.75 ft (0.23 m) above land-surface datum. Prior June 30, 1986, top of shelter floor, 3.59 ft (1.09 m) above land-surface datum. REMARKS.--Abandoned observation well. Automatic recorder installed on December 20, 1985. Estimated noon value: June 30. PERIOD OF RECORD.--December 1985 to September 1986. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 38.10 ft (11.61 m) below land-surface datum, June 16, 1986; lowest water level recorded, 42.95 ft (13.09 m) below land-surface datum, Apr. 4, 1986. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 40.52 41.13 41.86 42.88 41.97 39.04 38.78 39.07 39.92 2 40.54 41.09 41.87 42.89 41.75 39.02 38.83 39.10 39.97 3 40.57 41.06 41.91 42.94 41.49 39.00 38.87 39.13 40.10 4 40.58 41.07 41.98 42.95 41.31 39.01 38.90 39.15 40.21 5 40.61 41.09 42.00 42.83 41.21 39.03 38.93 39.21 40.28 6 40.65 41.09 42.03 42.82 41.16 39.06 38.93 39.25 40.37 7 40.65 41.11 42.06 42.76 41.01 39.09 38.87 39.28 40.45 8 40.72 41.11 42.12 42.74 40.82 38.82 38.86 39.32 40.52 9 40.71 41.12 42.16 42.60 40.71 38.57 38.87 39.40 40.60 10 40.67 41.13 42.16 42.48 40.59 38.44 38.88 39.45 40.68 11 40.59 41.17 42.15 42.39 40.45 38.30 38.87 39.50 40.70 12 40.57 41.21 42.18 42.35 40.35 38.23 38.80 39.56 40.73 13 40.57 41.24 42.21 42.28 40.16 38.17 38.75 39.55 40.80 14 40.59 41.29 42.25 42.25 39.87 38.14 38.71 39.50 40.89 15 40.66 41.33 42.27 42.28 39.70 38.12 38.66 39.45 40.96 16 40.71 41.36 42.27 42.33 39.52 38.12 38.63 39.42 41.07 17 40.75 41.39 42.30 42.36 39.46 38.14 38.63 39.42 41.13 18 40.76 41.40 42.34 42.38 39.42 38.16 38.67 39.45 41.23 19 40.78 41.40 42.38 42.38 39.41 38.20 38.70 39.49 41.31 20 40.81 41.45 42.40 42.40 39.42 38.25 38.71 39.54 41.41 21 40.21 40.87 41.49 42.42 42.40 39.42 38.27 38.78 39.59 41.47 22 40.21 40.90 41.54 42.53 42.37 39.41 38.27 38.88 39.61 41.50 23 40.22 40.92 41.59 42.65 42.31 39.45 38.32 38.92 39.61 41.51 24 40.28 40.93 41.64 42.76 42.26 39.48 38.37 38.93 39.65 41.56 25 40.35 40.97 41.64 42.83 42.25 39.47 38.41 38.94 39.74 41.67 26 40.39 41.00 41.69 42.86 42.26 39.47 38.45 39.00 39.83 41.78 27 40.41 41.05 41.78 42.86 42.26 39.48 38.51 39.01 39.93 41.79 28 40.40 41.11 41.84 42.85 42.28 39.50 38.55 39.03 40.01 41.79 29 40.41 41.13 42.87 42.25 39.41 38.59 39.09 40.06 41.80 30 40.44 41.16 42.86 42.15 39.23 38.68 39.11 40.02 41.81 31 40.51 41.14 42.88 39.12 39.08 39.94 LOW 41.16 41.84 42.88 42.95 41.97 39.09 39.11 40.06 41.81 HIGH 40.52 41.06 41.86 42.15 39.12 38.12 38.63 39.07 39.92 36 geR Z 38 PNgl 40 t4 42 OS < 44 DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1985 1988 323 GROUND-WATER LEVELS RIO HONDO AND RIO PUERTO NUEVO BASINS 182413066044000. Local number, 220. LOCATION.--Lat 18°24'13", long 66°04'40". Owner: P.R. Aqueduct and Sewer Authority. Name: Parque San Luis Rey-Americo Miranda AQUIFER.--Surficial Deposits-Cibao Formation. WELL CHARACTERISTICS.--Drilled unused artesian well, diameter 10 in (0.25 m), cased 8 in (0.20 m) 0-166 ft (0- 50.6 m), perforated 39-166 ft (11.9-50.6 m). Depth 166 ft (50.6 m). DATUM.--Elevation of land-surface datum is about 16.4 ft (5.0 m) above mean sea level, from topographic map. Measuring point:* Top of shelter floor, 3.00 ft (0.91 m) above land-surface datum. REMARKS.--Abandoned observation well. Automatic recorder installed on Feb. 6, 1986. PERIOD OF RECORD.--February 1986 to September 1986. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, +2.99 ft (0.91 m) above land-surface datum, Feb. 6, May 8-9, 1986: lowest water level recorded, 0.77 ft (0.23 m) below land-surface datum, Sept. 20-21, 1986. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 +2.59 +2.21 +2.49 + .49 + .01 .08 .30 2 +2.57 +2.19 +2.72 + .45 .00 .10 .31 3 +2.57 +2.19 +2.84 + .42 .01 .12 .36 4 +2.56 +2.19 +2.92 + .39 .03 .14 .38 5 +2.55 +2.44 +2.93 + .33 .05 .18 .40 6 +2.97 +2.53 +2.48 +2.92 + .19 + .01 .21 .40 7 +2.97 +2.51 +2.54 +2.92 + .15 .04 .24 .45 8 +2.96 +2.49 +2.56 +2.96 + .38 .05 .26 .47 9 +2.92 +2.47 +2.62 +2.97 + .55 .07 .31 .49 10 +2.90 +2.47 +2.75 --- + .60 .12 .35 .52 11 +2.87 +2.49 +2.82 + .68 .12 .36 .53 12 +2.84 +2.49 +2.83 + .69 .09 .39 .53 13 +2.83 +2.48 +2.83 + .67 .10 .34 .59 14 +2.81 +2.49 +2.82 + .64 .11 .28 .63 15 +2.80 +2.50 +2.79 + .61 .04 .20 .65 16 +2.77 +2.50 +2.76 --- + .51 .02 .19 .67 17 +2.78 +2.50 +2.73 + .98 + .52 + .02 .20 .68 18 +2.77 +2.49 +2.71 + .92 + .47 + .03 .23 .70 19 +2.77 +2.48 +2.69 + .88 + .42 + .02 .21 .72 20 +2.76 +2.43 +2.66 + .80 + .37 .00 .32 .75 21 +2.76 +2.40 +2.16 + .73 + .34 .03 .36 .76 22 +2.73 +2.36 +2.30 + .69 + .32 .08 .38 .74 23 +2.69 +2.33 +2.37 + .64 + .29 .12 .40 .63 24 +2.68 +2.31 +2.39 + .59 + .24 .07 .42 .61 25 +2.69 +2.32 +2.39 + .55 + .20 .09 .47 .59 26 +2.67 +2.29 +2.36 + .50 + .15 .12 .51 .60 27 +2.64 +2.28 +2,33 + .48 + .12 .14 .56 .59 28 +2.63 +2.25 +2.34 + .43 + .09 .23 .51 .60 29 --- +2.25 +2.34 + .49 + .05 .25 .41 .57 30 +2.22 +2.37 + .50 + .03 .24 .34 .57 31 +2.22 --- + .49 --- .10 .31 --- LOW +2.22 +2.16 + .03 .25 .56 .76 HIGH +2.59 +2.83 + .69 + .03 .08 .30 O +4 W CD Lo +2 w ia, za 0 - g >in La I 2 - J C IA 4C aJ 4 FEB MAR APR MAY JUN JUL AUG SEP 1986 + Above land-surface datum. 324 GROUND-WATER LEVELS RIO HONDO TO RIO PUERTO NUEVO BASINS 182436066031200. Local number, 221. LOCATION.--Lat 18°24'36", long 66°03'12". Owner: P.R. Highway Authority Name: Hyde Park TW-10. AQUIFER.--Surficial Deposits-Cibao Formation. WELL CHARACTERISTICS.--Drilled water-table well, diameter 4 in (0.10 m), cased 4 in (0.10 m) 1-107 ft (0-32.36 m), perforated 19-107 ft (5.79-32.6 m). Depth 107 ft (32.6 m). DATUM.--Elevation of land-surface datum is about 82.0 ft (25.0 m) above mean sea level, from topographic map. Measuring point: Hole on side of casing, 0.70 ft (0.21 m) above land-surface datum. Prior July 28, 1986, top of shelter floor, 3.14 ft (0.96 m) above land-surface datum. REMARKS.--Observation well. Automatic recorder installed on Dec. 17, 1985. PERIOD OF RECORD.--December 1985 to September 1986. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 1.92 ft (0.58 m) below land-surface datum, May 14, 1986; lowest water level recorded, 15.59 ft (4.75 m) below land-surface datum, Apr. 5, 1986. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 7.53 9.21 11.93 15.26 7.74 6.29 8.40 7.61 8.01 2 7.60 9.31 12.05 15.37 8.05 6.49 8.45 7.77 8.17 3 7.65 9.41 12.17 15.47 5.43 6.69 8.42 7.94 8.33 4 7.56 9.24 12.29 15.53 5.96 6.85 8.53 8.07 8.46 5 7.66 9.11 12.42 14.80 6.50 7.06 8.59 8.14 8.52 6 7.72 9.31 12.55 13.04 5.75 7.19 8.64 8.24 8.48 7 7.76 9.50 12.69 12.89 5.22 7.23 8.09 8.34 8.54 8 7.83 9.63 12.83 12.89 4.36 7.13 8.22 8.42 8.71 9 7.49 9.74 12.95 12.35 4.79 6.80 8.34 8.54 8.82 10 7.16 9.86 13.07 11.26 5.22 6.93 8.49 8.68 8.96 11 7.36 9.97 13.16 11.42 3.58 6.00 8.55 8.78 9.10 12 7.50 10.03 13.28 11.58 4.10 6.25 8.43 8.75 9.29 13 7.71 10.10 13.41 11.71 2.67 6.42 8.51 8.26 9.46 14 7.83 10.24 13.50 11.85 2.32 6.60 8.51 7.98 9.61 15 7.95 10.36 13.50 12.03 3.25 6.76 8.52 7.65 9.72 16 --- 8.02 10.47 13.59 12.17 4.07 6.94 8.50 7.88 9.85 17 6.73 8.08 10.57 13.70 12.31 4.59 7.11 8.38 8.09 10.00 18 6.76 7.94 10.66 13.82 12.44 5.05 7.23 8.47 8.25 10.17 19 6.80 8.07 10.77 13.94 12.57 5.25 7.34 8.62 8.38 10.11 20 6.78 8.18 10.88 14.04 12.72 5.67 7.41 8.75 8.53 10.23 21 6.85 8.28 11.00 14.16 11.33 5.89 7.50 8.85 8.67 10.35 22 6.84 8.39 11.11 14.28 9.68 6.06 7.57 8.96 8.79 10.27 23 6.91 8.46 11.24 14.39 9.82 6.29 7.68 9.02 8.93 9.88 24 7.00 8.52 11.36 14.51 10.02 6.45 7.76 9.10 9.03 10.03 25 7.07 8.57 11.46 14.63 10.25 6.58 7.84 8.62 9.14 10.17 26 7.13 8.67 11.57 14.70 10.45 6.71 8.00 8.76 9.26 10.32 27 7.21 8.77 11.70 14.80 10.59 5.42 8.08 8.93 9.39 10.39 28 7.27 8.89 11.82 14.90 10.64 5.55 8.11 9.22 9.37 10.52 29 7.26 8.98 --- 14.94 10.64 5.85 8.21 9.33 7.90 10.10 30 7.22 9.08 15.04 10.35 6.08 8.33 8.11 8.21 10.19 31 7.44 9.11 15.16 --- 6.22 -- 7.35 8.34 --- LOW 9.11 11.82 15.16 15.53 8.05 8.33 9.33 9.39 10.52 HIGH 7.16 9.11 11.93 9.68 2.32 6.00 7.35 7.61 8.01 DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1985 1986 325 GROUND-WATER LEVELS RIO GRANDE DE LOIZA BASIN 182515065594100. Local number, 222. LOCATION.--Lat 18°25'15', long 65°59'41". Owner: U.S. Geological Survey. Name: Campo Rico TW-1. AQUIFER.--Surficial Deposits. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 4 in (0.10 m). Depth 100 ft (30.5 m). DATUM.--Elevation of land-surface datum is about 10.0 ft (3.05 m) above mean sea level, from topographic map. Measuring point: Hole on side of casing, 0.80 ft (0.24 m) above land-surface datum. Prior July 28, 1986, top of shelter floor, 3.10 ft. (0.94 m) above land-surface datum. REMARKS.--Observation well. Automatic recorder installed on February 5, 1986. PERIOD OF RECORD.--February 1986 to September 1986. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 4.42 ft (1.35 m) below land-surface datum, Aug. 31, 1986; lowest water level recorded, 7.42 ft (2.26 m) below land-surface datum, Feb. 9, 1986. WATER LFVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 6.19 4.98 4.82 4.92 6.10 6.11 4.73 2 6.21 4.95 4.82 6.01 6.19 6.09 4.65 3 6.21 4.92 5.70 4.98 6.18 6.07 4.72 4 6.18 4.92 5.77 6.10 6.12 6.09 4.70 5 6.22 5.80 5.78 6.14 6.01 4.92 4.63 6 6.30 6.11 4.91 5.79 6.14 4.99 4.84 4.63 7 6.29 4.97 4.95 5.80 6.14 6.08 5.80 4.69 8 6.16 4.91 4.93 5.78 6.13 6.00 4.81 4.85 9 6.14 4.92 4.88 5.78 6.14 6.00 4.82 6.04 10 6.14 4.96 5.92 5.77 6.09 6.05 4.85 6.25 11 - 6.17 6.07 4.98 5.77 6.07 4.98 6.04 6.25 12 6.29 6.01 6.00 5.82 6.09 4.97 6.15 6.18 13 6.33 6.17 4.96 5.74 6.00 6.06 6.25 6.11 14 6.31 6.16 4.98 5.70 6.09 6.14 6.21 6.07 15 6.33 6.16 4.97 5.82 6.08 6.16 6.10 4.96 16 6.24 6.18 4.96 5.78 6.19 6.29 6.07 4.84 17 6.30 6.16 4.97 5.81 6.20 6.32 4.94 4.65 18 6.42 6.20 6.04 4.85 6.23 6.32 4.90 4.63 19 6.31 6.20 4.93 4.90 6.22 6.28 5.81 4.65 20 6.12 6.23 5.90 4.99 6.26 6.14 4.79 4.62 21 5.93 6.17 5.81 6.06 6.18 4.92 4.78 4.72 22 4.97 4.98 5.84 4.99 6.07 4.90 5.70 4.86 23 6.04 4.88 4.87 4.94 6.02 4.86 4.69 6.03 24 6.06 5.86 4.87 4.91 6.08 5.77 5.71 6.09 25 6.12 4.83 4.85 4.89 6.00 4.78 5.80 6.09 26 4.97 4.96 4.89 4.89 4.96 4.89 4.96 6.13 27 6.10 6.00 4.89 4.90 6.04 4.98 6.10 6.15 28 6.11 4.90 4.93 4.92 6.07 6.08 6.09 6.10 29 6.04 4.89 4.91 6.12 6.13 6.03 6.06 30 6.08 4.88 4.88 6.14 6.10 4.90 6.04 31 6.10 4.93 6.11 4.82 LOW 6.23 6.04 6.06 6.26 6.32 6.25 6.25 HIGH 4.83 4.85 4.82 4.92 4.78 4.69 4.62 Isn SEP JUL AUG FEB MAR APR MAY JUN 1986 326 GROUND-WATER LEVELS RIO HUMACAO TO RIO SECO BASINS 175858066100200. Local number, 6. LOCATION.--Lat 17°58'58", long 66°10'02". Owner: Doctor Bruno. Name: Juana 5. AQUIFER.--Alluvium of Quaternary Age. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 16 in (0.41 m) Depth 173 ft (52.74 m) reported, 110 ft (33.54 m) measured. DATUM.--Elevation of land-surface datum is about 127 ft (38.7 m) above mean sea level, from topographic map. Measuring point: Top of shelter floor, 3.00 ft (0.91 m) above land-surface datum. After Aug. 7, 1981, top of 16 in (0.41 m) casing, 1.55 ft (0.47 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--November 1960 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 26.20 ft (7.99 m) below land-surface datum, Dec. 10, 1979; lowest water level recorded, 65.95 ft (20.10 m) below land-surface datum, June 2, 1958. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 52.02 38.96 30.38 30.68 33.82 37.70 41.77 43.59 44.22 44.38 46.59 48.71 2 52.03 38.31 30.32 30.77 33.95 37.84 41.89 43.67 44.29 44.49 46.61 48.71 3 52.05 37.67 30.26 30.85 34.09 37.98 41.99 43.77 44.33 44.59 46.57 48.69 4 52.06 37.06 30.21 30.96 34.23 38.13 42.07 43.87 44.37 44.67 46.61 48.67 5 52.07 36.47 30.16 31.05 34.36 38.10 42.12 43.98 44.43 44.73 46.76 48.67 6 52.04 35.92 30.10 31.11 34.48 38.33 42.19 44.09 44.47 44.79 46.90 48.69 7 51.88 35.39 30.05 31.19 34.63 38.47 42.27 44.23 44.52 44.85 46.97 48.73 8 51.26 34.91 30.02 31.30 34.80 38.61 42.37 44.31 44.57 44.90 47.06 48.76 9 50.68 34.47 30.00 31.41 34.98 38.70 42.46 44.40 44.62 44.96 47.10 48.81 10 49.89 34.03 29.98 31.50 35.15 38.89 42.49 44.50 44.64 45.02 47.12 48.87 11 48.96 33.64 29.95 31.60 35.30 39.05 42.57 44.60 44.59 45.07 47.16 48.94 12 48.13 33.27 29.95 31.71 35.46 39.22 42.62 44.67 44.54 45.'2 47.25 49.01 13 47.35 32.98 29.92 31.81 35.62 39.35 42.63 44.74 44.47 45.17 47.36 49.05 14 46.64 32.70 29.90 31.91 35.76 39.55 42.67 44.78 44.43 45.22 47.41 49.10 15 45.98 32.44 29.90 32.00 35.87 39.66 42.73 44.74 44.38 45.28 47.45 49.16 16 45.39 32.22 29.90 32.12 36.00 39.79 42.80 44.66 44.32 45.33 47.47 49.23 17 44.80 32.04 29.93 32.20 36.13 39.90 42.86 44.58 44.24 45.42 47.51 49.28 18 44.27 31.88 29.92 32.30 36.28 40.05 42.92 44.52 44.10 45.52 47.55 49.35 19 43.75 31.71 29.88 32.43 36.43 40.18 42.96 44.45 43.94 45.62 47.60 49.38 20 43.29 31.54 29.84 32.57 36.56 40.29 43.01 44.39 43.85 45.74 47.68 49.39 21 42.84 31.40 29.86 32.68 36.71 40.42 43.09 44.32 43.84 45.87 47.79 49.42 22 42.44 31.28 29.92 32.81 36.84 40.53 43.15 44.27 43.87 46.00 47.89 49.41 23 42.06 31.16 29.98 32.91 36.95 40.65 43.20 44.20 43.91 46.13 47.98 49.31 24 41.70 31.03 30.03 33.03 37.02 40.79 43.24 44.16 43.93 46.22 48.09 49.36 25 41.39 30.91 30.06 33.12 37.12 40.97 43.28 44.09 43.95 46.27 48.22 49.44 26 41.11 30.82 30.15 33.17 37.25 41.10 43.33 44.03 43.98 46.30 48.34 49.49 27 40.85 30.71 30.26 33.24 37.41 41.22 43.39 43.97 44.02 46.33 48.45 49.49 28 40.58 30.63 30.33 33.32 37.56 41.34 43.46 43.94 44,10 46.37 48.56 49.56 29 40.32 30.55 30.40 33.41 41.45 43.49 43.98 44.19 46.40 48.64 49.65 30 40.05 30.45 30.50 33.55 41.55 43.53 44.06 44.28 46.44 48.67 49.74 31 39.58 30.59 33.67 41.67 44.14 46.51 48.69 LOW 52.07 38.96 30.59 33.67 37.56 41.67 43.53 44.78 44.64 46.51 48.69 49.74 HIGH 39.58 30.45 29.84 30.68 33.82 37.70 41.77 43.59 43.84 44.38 46.57 48.67 WTR YR 1986 MEAN 40.9 LOW 52.07 HIGH 29.84 9 2 22 Leas aj 4 o 32 w o W th. 42 52 62 AS ONDJ FMAA4JJ ASONDJ FMAMJJ ASONDJ FMAMJJ 1986 1983 1984 1985 327 GROUND-WATER LEVELS RIO GUAYANES BASIN 180415065513900. Local number, 96. LOCATION.--Lat 18°04 1 15", long 65°51'39". Owner: P.R. Aqueduct and Sewer Authority. Name: USGS TW-2 or Yabucoa 7. AQUIFER.--Alluvium of Quaternary Age. WELL CHARACTERISTICS.--Drilled observation water-table well, diameter 16 in (0.41 m), cased 0-10 ft (0-3.05 m), diameter 6 in (0.16 m), cased about 0-183 ft (0-55.79 m), perforated 56-81 ft (17.07-24.70 m), 102-123 ft (31.10-37.50 m), 144-181 ft (43.90-55.18 m). Depth 181 ft (55.18 m). DATUM.--Elevation of land-surface datum is about 25 ft (7.62 m) above mean sea level, from topographic map. Measuring point: Top of shelter floor, 4.00 ft (1.22 m) above land-surface. REMARKS.--Observation recording well. PERIOD OF RECORD.--Ap-il 25, 1978 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 13.39 ft (4.08 m) below land-surface datum, Nov. 18, 1985; lowest water level recorded, 28.29 ft (8.62 m) below land-surface datum, Sept. 20, 1980. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 16.80 13.91 16.27 17.98 19.55 19.63 19.10 16.72 17.05 17.80 16.80 2 16.59 14.08 16.32 17.90 19.66 19.61 18.97 16.72 17.15 17.75 16.80 3 16.42 14.28 16.38 17.85 19.74 19.56 18.88 16.72 17.24 17.71 16.80 4 16.29 14.46 16.40 17.82 19.82 19.52 18.77 16.72 17.30 17.72 16.80 5 16.17 14.59 16.43 17.79 19.88 19.46 18.65 16.72 17.40 17.76 16.80 6 15.84 14.69 16.46 17.78 19.91 19.37 18.57 16.72 17.45 17.85 16.80 7 15.43 14.79 16.48 17.78 19.89 19.29 18.48 16.72 17.45 17.93 16.81 8 15.10 14.90 16.52 17.79 19.87 19.21 18.42 16.72 17.46 17.96 16.82 9 14.73 15.04 16.59 17.84 19.85 19.14 18.36 16.71 17.46 17.97 16.90 10 14.42 15.19 16.69 17.92 19.85 19.04 18.30 16.71 17.46 17.86 16.98 11 14.21 15.30 16.82 18.05 19.86 18.96 18.18 16.71 17.46 17.71 17.09 12 14.05 15.39 16.96 18.14 19.89 18.94 18.00 16.71 17.46 17.46 17.18 13 13.89 15.48 17.13 18.23 19.92 18.92 17.81 16.71 17.46 17.25 17.23 14 13.80 15.57 17.28 18.33 19.97 18.89 17.61 16.71 17.46 17.05 17.27 15 13.81 15.66 17.42 18.43 20.00 18.90 17.44 16.71 17.46 16.84 17.29 16 13.88 15.75 17.54 18.52 20.01 18.95 17.30 16.71 17.46 16.80 17.31 17 14.01 15.81 17.62 18.63 20.01 19.01 17.22 16.71 17.46 16.80 17.36 18 14.14 --- 15.90 17.69 18.69 20:01 19.10 17.21 16.71 17.46 16.80 17.41 19 14.25 13.40 15.98 17.76 18.76 19.97 19.23 17.12 16.71 17.74 16.80 17.47 20 14.37 13.42 16.00 17.87 18.83 19.89 19.22 17.02 16.71 17.95 16.80 17.52 21 14.57 13.43 16.01 17.95 18.89 19.84 19.22 16.93 16.71 18.17 16.80 17.54 22 14.81 13.47 16.02 18.00 18.95 19.84 19.24 16.85 16.71 18.33 16.80 17.54 23 14.95 13.50 16.01 18.09 18.99 19.79 19.29 16.81 16.71 18.45 16.80 17.53 24 14.94 13.50 16.03 18.17 19.05 19.75 19.36 16.72 16.71 18.45 16.80 17.54 25 14.85 13.53 16.08 18.20 19.14 19.71 19.38 16.72 16.71 18.36 16.80 17.55 26 14.70 13.57 16.14 18.22 19.24 19.69 19.40 16.72 16.71 18.22 16.80 17.61 27 14.57 13.61 16.20 18.22 19.33 19.68 19.41 16.72 16.71 18.15 16.80 17.69 28 13.62 16.23 18.23 19.43 19.70 19.39 16.72 16.78 18.13 16.80 17.74 29 13.68 16.22 18.22 19.70 19.34 16.72 16.88 18.06 16.80 17.80 30 13.78 16.19 18.14 19.64 19.23 16.72 16.96 17.97 16.80 17.86 31 16.21 18.07 19.62 16.72 17.92 16.80 LOW 16.23 18.23 19.43 20.01 19.63 19.10 16.96 18.45 17.97 17.86 HIGH 13.91 16.27 17.78 19.55 18.89 16.72 16.71 17.05 16.80 16.80 S 10 ei4 1-4 14 4.140 Zs( t._ 18 > La V) 22 rez 26 ONDJ FIAAMJJ ASONDJ FMAMJJ ASONDJ FMAMJJ AS 1983 1984 1985 1986 GROUND-WATER LEVELS RIO SALINAS TO RIO JACAGUAS BASINS 175829066232200. Local number, 87. LOCATION.--Lat 17°58'29", long 66°23'22". Owner: Francisco Alomar. Name: Alomar 1. AQUIFER.--Alluvium of Quaternary Age. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 20 in (0.51 m), irun cased Depth 112 ft (34.14 m). DATUM.--Elevation of land-surface datum is 35.32 ft (10.77 m) above mean sea level. Measuring point: Bottom of clean-out shelter door, 2.50 ft (0.76 m) above land-surface datum. Prior to August 1981, top of recorder shelter floor, 4.00 ft (1.22 m) above land-surface datum. REMARKS. Recording observation well. PERIOD OF RECORD.--April 1967 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 8.45 ft (2.58 m) below land-surface datum, Dec. 10, 1970; lowest water level recorded, 49.18 ft (14.99 m) below land-surface datum, July 27, 1974. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 24.01 18.60 18.46 19.59 21.28 21.45 22.03 23.74 22.71 23.35 25.07 23.37 2 23.87 18.58 18.47 19.70 20.72 21.43 22.24 23.15 22.70 23.73 25.11 23.41 3 23.75 18.57 18.48 19.89 20.99 21.43 23.05 23.13 22.71 24.01 24.97 23.44 4 23.84 18.57 18.50 19.86 20.30 21.43 22.52 23.54 23.23 24.10 24.87 23.48 5 23.81 18.56 18.50 19.77 21.12 21.74 23.10 23.98 22.79 23.85 25.04 23.53 6 23.76 18.56 18.51 19.78 21.25 21.81 22.71 24.15 22.77 23.44 24.70 24.12 7 20.58 18.53 18.56 19.83 21.33 21.73 23.19 24.14 22.79 23.49 24.52 24.51 8 19.16 18.52 18.56 19.97 21.29 22.15 23.02 24.26 22.77 23.99 24.85 24.14 9 19.06 18.52 18.60 20.09 20.77 22.21 23.28 24.41 22.77 24.12 24.97 24.56 10 19.10 18.49 18.73 20.18 20.77 22.24 23.10 23.95 22.79 24.28 24.86 24.78 11 19.14 18.45 18.69 20.22 20.69 22.45 23.13 23.15 22.78 24.37 24.77 24.83 12 19.23 18.45 18.73 20.18 20.66 22.37 22.86 22.99 22.33 24.43 24.87 25.03 13 19.34 18.44 18.86 20.16 20.70 22.14 22.59 22.81 23.18 24.40 24.94 25.18 14 19.22 18.44 18.90 20.19 20.21 22.08 23.34 22.43 23.69 24.23 25.13 24.27 15 19.25 18.43 18.84 20.25 20.69 22.28 23.13 22.35 23.60 24.32 25.21 24.22 16 19.32 18.41 18.88 20.31 20.66 21.89 23.46 22.31 23.51 24.48 25.02 24.92 17 19.30 18.44 18.92 20.44 20.79 21.94 23.44 22.32 22.62 24.25 24.99 24.73 18 19.31 18.42 19.05 20.45 21.11 22.52 23.30 22.35 23.11 24.53 24.94 24.90 19 19.43 18.40 19.14 20.35 21.13 22.40 23.52 22.35 23.68 24.60 25.16 24.68 20 19.66 18.41 19.18 20.35 21.07 22.89 22.67 22.38 23.32 24.60 25.30 24.88 21 19.61 18.44 19.21 20.41 21.10 23.03 23.41 22.39 22.97 24.36 25.39 24.89 22 19.27 18.49 19.15 20.53 21.19 23.06 23.52 22.42 23.37 24.56 25.48 24.90 23 19.28 18.50 19.18 20.48 21.21 22.19 23.41 22.45 23.77 24.68 25.17 24.95 24 19.26 18.45 19.35 20.57 20.90 23.17 23.47 22.48 23.88 24.76 24.67 25.13 25 19.09 18.45 19.38 20.53 21.20 23.42 23.52 22.49 23.76 24.87 24.97 25.21 26 19.05 18.48 19.40 20.54 21.28 23.50 23.45 22.50 23.81 24.90 25.09 25.27 27 19.07 18.48 19.45 20.65 21.39 22.95 22.70 22.54 23.94 24.36 24.85 25.17 28 19.06 18.47 19.46 21.08 21.50 22.19 23.52 22.60 23.98 23.75 25.12 24.69 29 19.00 18.47 19.40 21.03 22.01 23.60 22.79 23.28 24.80 24.04 25.11 30 18.83 18.48 19.56 21.00 21.97 23.78 22.82 23.21 24.92 23.50 25.35 31 18.66 19.64 20.88 21.97 22.73 24.98 23.37 LOW 24.01 18.60 19.64 21.08 21.50 23.50 23.78 24.41 23.98 24.98 25.48 25.35 HIGH 18.66 18.40 18.46 19.59 20.21 21.43 22.03 22.31 22.62 23.35 23.37 23.37 WTR YR 1986 MEAN 22.0 LOW 25.48 HIGH 18.40 16 L73( 21 U z< _rt 26 to to Z 31 ce 36 ONDJFMAMJJ ASONDJFMAMJJ ASONDJFMAMJJ AS 1983 1944 1985 1986 328 329 GROUND-WATER LEVELS RIO INABON TO RIO LOCO BASINS 180133066503300. Local number, 132. LOCATION.--Lat 18°01'33", long 66°50'33". Owner: Pittsburg Plate Glass 4. Name: Yauco 2. AQUIFER.--Limestone of Tertiary Age. WELL CHARACTERISTICS.--Drilled observation well, cased 20 in (0.51 m) 0-20 ft (0-6.1 m), 12 in (0.30 m) perforated pipe 20-84 ft (6.1-'5.61 m), 10 in (0.25 m) perforated pipe 84-190 ft (25.61-57.93 m). Depth 190 ft (57.93 m). DATUM.--Elevation of land-surface datum is about 75 ft (22.87 m) above mean sea level, from topographic map. Measuring point: Top of shelter floor, 2.35 ft (0.72 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--July 1972 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, +0.12 ft (0.04 m) below land-surface datum, July 19, 1979; lowest water level recorded, 36.91 ft (11.25 m) below land-surface datum, June 27, 1974. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 7.42 2.45 5.34 6.57 7.26 8.05 9.94 10.04 5.69 7.40 8.98 10.62 2 7.46 2.45 5.34 6.64 7.26 8.08 9.90 9.80 5.75 7.43 9.00 10.40 3 7.51 2.45 5.37 6.68 7.30 8.14 10.02 9.83 5.83 7.61 9.08 10.54 4 7.53 2.45 5.37 6.68 7.31 8.20 10.01 9.91 5.84 7.67 9.11 10.56 5 7.54 2.45 5.37 6.69 7.28 8.25 9.31 9.94 5.94 7.76 9.29 10.56 6 2.45 5.37 6.69 7.28 8.28 9.15 10.04 6.04 7.71 9.31 10.63 7 2.45 5.37 6.83 7.30 8.32 9.25 10.04 6.14 7.85 9.44 10.68 8 --- 2.45 5.37 6.83 7.32 8.39 9.27 9.74 6.22 7.93 9.14 10.78 9 4.22 2.45 6.21 6.85 7.33 8.43 9.23 9.57 6.28 8.02 9.11 10.78 10 4.25 2.45 6.23 6.86 7.34 8.51 9.21 9.50 6.34 8.10 9.13 10.84 11 4.32 2.45 6.24 6.84 7.39 8.56 9.25 8.24 6.41 8.20 9.16 10.90 12 4.32 2.45 6.27 6.85 7.40 8.63 9.31 7.88 6.14 8.25 9.25 11.04 13 4.32 2.45 6.28 6.90 7.40 8.69 9.35 6.26 6.24 8.23 9.32 11.10 14 4.32 2.45 6.28 6.96 7.40 8.73 9.40 4.44 6.32 8.36 9.44 11.13 15 4.33 5.69 6.30 7.00 7.49 8.78 9.47 5.44 6.43 8.41 9.44 11.24 16 4.33 5.70 6.31 6.99 7.50 8.85 9.56 5.82 6.47 8.30 9.52 11.31 17 4.33 5.67 6.33 7.01 7.54 8.93 9.65 5.95 6.54 8.42 9.57 11.35 18 4.33 5.31 6.34 7.02 7.60 8.98 9.71 6.07 6.60 8.44 9.70 11.42 19 4.33 5.33 6.30 7.04 7.63 9.10 9.80 6.11 6.64 8.52 9.70 11.49 20 4.38 5.33 6.34 7.10 7.66 9.16 9.84 6.16 6.69 8.51 9.88 11.55 21 4.38 5.33 6.34 7.10 7.70 9.30 10.03 6.20 6.70 8.69 10.08 11.51 22 4.38 5.33 6.35 7.15 7.70 9.33 10.09 6.24 6.80 8.73 10.19 11.16 23 4.38 5.33 6.37 7.18 7.80 9.36 10.15 6.31 6.84 8.78 10.27 11.24 24 3.35 5.33 6.30 7.24 7.83 9.45 10.21 6.40 6.94 8.86 10.33 11.31 25 3.35 5.33 6.40 7.23 7.84 9.45 10.30 6.50 7.02 8.92 10.45 11.34 26 3.35 5.33 6.40 7.21 7.90 9.57 10.44 6.58 7.08 8.91 10.49 11.45 27 3.35 5.33 6.44 7.24 7.95 9.64 10.45 6.63 7.10 8.84 10.56 11.17 28 3.35 5.33 6.44 7.28 7.99 9.67 10.57 6.68 7.20 8.87 10.68 9.87 29 3.35 5.34 6.50 7.32 --- 9.69 10.70 6.76 7.22 8.87 10.76 9.77 30 3.35 5.34 6.54 7.24 9.70 10.84 5.68 7.30 8.92 10.68 9.88 31 2.45 --- 6.54 7.28 9.85 --- 5.66 --- 8.96 10.60 --- LOW 5.70 6.54 7.32 7.99 9.85 10.84 10.04 7.30 8.96 10.76 11.55 HIGH 2.45 5.34 6.57 7.26 8.05 9.15 4.44 5.69 7.40 8.98 9.77 s 2 J CO 6 < Z 10 9 ti. 14 1:1/ crz 4t 18 ONDJ FMAMJJ ASONDJ FMAMJJ ASONDJ FMAMJJ AS 1983 1954 1985 1986 + Above land-surface datum. 330 GROUND-WATER LEVELS RIO INABON TO RIO LOCO BASINS 175950066354200. Local number, 141. LOCATION.--Lat 17°59'50", long 66°35'42". Owner: P.R. Aqueduct and Sewer Authority. Name: Restaurada 8A. AQUIFER.--Alluvium of Quaternary Age. WELL CHARACTERISTICS.--Drilled unused public supply well, diameter 16-10 in (0.41-0.25 m), cased 16 in (0.41 m) 2-20 ft (0.6-6.1 m), perforated 20-130 ft (6.1-39.6 m), 10 in (0.25 m) 128-165 ft (39.0-50.3 m), perforated. Depth 165 ft (50.3 m). DATUM.--Elevation of land-surface datum is about 24 ft (7.3 m) above mean sea level, from topographic map. Measuring point: Bottom edge of hole on side of casing, 1.9 ft (0.58 m) above land-surface datum, 26.15 ft (7.97 m) above mean sea level. REMARKS.--Recording observation well. PERIOD OF RECORD.--October 1981 to March 1, 1986, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 11.19 ft (3.41 m) below land-surface datum, Oct. 09, 1985; lowest water level recorded, 28.59 ft (8.714 m) below land-surface datum, July 9, 1982. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 14.56 12.12 13.25 17.07 16.35 2 14.60 12.06 13.34 16.89 --- 3 14.68 11.95 13.57 16.79 4 15.47 11.83 13.59 - 16.23 5 15.36 11.82 13.62 - 16.00 6 14.76 11.86 13.66 15.98 7 12.78 11.87 13.71 16.06 8 11.22 11.94 13.73 --- 16.10 9 11.24 11.96 13.77 13.77 16.12 10 11.39 12.00 13.84 14.36 16.14 11 11.47 12.05 13.87 14.51 16.08 12 11.61 12.16 13.97 14.49 16.07 13 11.68 12.24 14.03 14.46 16.08 14 11.79 12.31 14.15 14.48 16.21 15 11.89 12.38 14.80 14.58 16.08 16 12.05 12.41 15.01 14.59 15.99 17 12.19 12.42 15.08 14.55 15.97 18 12.32 12.50 15.14 16.17 16.04 19 12.40 12.60 15.12 16.60 16.08 20 12.45 12.69 15.02 16.72 16.03 21 12.56 12.79 14.89 16.80 15.94 22 12.66 12.86 14.73 16.94 15.87 23 12.71 12.95 14.54 17.08 15.77 24 12.55 12.99 14.22 17.21 15.68 25 12.48 13.06 17.24 15.74 26 12.46 13.12 17.22 15.67 27 12.41 13.20 17.28 15.96 28 12.41 13.23 17.42 16.26 29 12.37 13.24 17.54 30 12.36 13.25 17.27 31 12.22 17.23 LOW 15.47 13.25 17.07 HIGH 11.22 11.82 15.67 9 < 14 ta a 19 ''‘PtieN"vut\4\1 z 24 crz 29 ONDJFMAMJJ ASONDJFMAMJJ ASONDJFMAIAJJ AS 1983 1984 1985 1986 4 331 GROUND-WATER LEVELS RIO GUANAJIBO BASIN 180132067033800. Local number, 143. LOCATION.--Lat 18°01'32", long 67°03'38". Owner: Pedro P. Vivoni. Name: Vivoni, Hacienda Amistad. AQUIFER.--Limestone of unknown age. WELL CHARACTERISTICS.--Drilled unused irrigation well, diameter 12 in (0.30 m). Depth 200 ft (60.98 m). DATUM.--Elevation of land-surface datum is about 52.5 ft (16.0 m) above mean sea level, from topographic map. Measuring point: Hole side of casing, 0.80 ft (0.24 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--December 1981 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 37.36 ft (11.39 m) below land-surface datum, Nov. 20, 1985; lowest water level recorded, 39.70 ft (12.10 m) below land-surface datum, June. 29, 1984. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 39.35 38.72 37.77 38.17 38.51 38.72 38.96 39.09 38.73 38.78 38.80 38.88 2 39.37 38.72 37.80 38.15 38.51 38.71 38.95 39.10 38.73 38.78 38.83 38.92 3 39.40 38.72 37.78 38.14 38.48 38.74 38.98 39.09 38.73 38.78 38.84 38.95 4 39.40 38.10 37.79 38.18 38.49 38.78 38.99 39.12 38.73 38.78 38.84 38.95 5 39.37 38.05 37.74 38.22 38.51 38.79 38.99 39.11 38.74 38.78 38.86 38.94 6 39.30 38.11 37.70 38.25 38.55 38.78 39.00 39.11 38.74 38.79 38.87 38.95 7 38.72 38.07 37.72 38.23 38.58 38.80 39.01 39.05 38.74 38.80 38.85 38.96 8 38.72 38.02 37.77 38.26 38.56 38.84 39.02 39.01 38.74 38.81 38.85 38.95 9 38.72 38.04 37.78 38.29 38.58 38.86 39.02 39.01 38.74 38.75 38.86 38.97 10 38.72 38.01 37.80 38.29 38.59 38.87 39.02 38.99 38.74 38.75 38.87 38.97 11 38.67 37.94 37.80 38.29 38.61 38.84 39.02 38.86 38.74 38.73 38.87 38.88 12 38.74 37.90 37.84 38.29 38.61 38.84 39.02 38.86 38.74 38.72 38.89 38.88 13 38.73 37.83 37.99 38.29 38.61 38.85 39.00 38.74 38.74 38.73 38.88 38.93 14 38.72 37.77 37.99 38.32 38.60 38.85 39.00 38.74 38.74 38.72 38.88 38.96 15 38.72 37.76 38.00 38.34 38.61 38.85 39.01 38.73 38.75 38.68 38.86 38.97 16 38.73 37.73 38.02 38.39 38.63 38.85 39.04 38.73 38.75 38.68 38.87 38.98 17 38.73 37.72 38.04 38.37 38.65 38.86 39.06 38.73 38.75 38.69 38.90 38.97 18 38.73 37.79 38.04 38.34 38.61 38.88 39.07 38.73 38.75 38.71 38.92 38.98 19 38.72 37.81 38.04 38.37 38.59 38.90 39.06 38.73 38.75 38.71 38.94 38.99 20 38.72 37.78 38.07 38.41 38.60 38.91 39.08 38.74 38.75 38.72 38.96 39.00 21 38.72 37.74 38.06 38.42 38.61 38.91 39.10 38.74 38.76 38.76 38.96 38.98 22 38.72 37.76 38.08 38.41 38.63 38.92 39.13 38.74 38.76 38.81 38.92 38.94 23 38.72 37.77 38.05 38.44 38.65 38.95 39.14 38.74 38.76 38.81 38.86 38.93 24 38.72 37.77 38.13 38.43 38.67 38.98 39.12 38.74 38.76 38.78 38.86 38.96 25 38.72 37.76 38.13 38.43 38.64 38.99 39.12 38.74 38.76 38.78 38.92 38.98 26 38.72 37.77 38.13 38.41 38.65 38.98 39.11 38.74 38.76 38.80 38.95 38.99 27 38.72 37.76 38.16 38.42 38.68 38.97 39.11 38.74 38.77 38.79 38.92 38.95 28 38.72 37.79 38.13 38.47 38.72 38.97 39.08 38.74 38.77 38.78 38.89 38.94 29 38.72 37.80 38.13 38.47 --- 38.98 39.09 38.74 38.77 38.79 38.90 38.98 30 38.72 37.77 38.13 38.49 38.97 39.08 38.73 38.77 38.79 38.92 39.01 31 38.72 --- 38.16 38.48 38.97 --- 38.73 --- 38.79 38.89 --- LOW 39.40 38.72 38.16 38.49 38.72 38.99 39.14 39.12 38.77 38.81 38.96 39.01 HIGH 38.67 37.72 37.70 38.14 38.48 38.71 38.95 38.73 38.73 38.68 38.80 38.88 WTR YR 1986 MEAN 38.6 LOW 39.40 HIGH 37.70 37 `cgp 1-4 Lao 1.41 38 wu.) 39 40 ONDJEMAMJJASONDJFMAMJJASONDJFMAMJJAS 1983 1984 1985 1986 332 GROUND-WATER LEVELS RIO CULEBRINAS BASIN 182018066593200. Local number, 83. LOCATION.--Lat 18°20'18", long 66°59'32". Owner: P.R. Energy and Power Authority. Name: San Sebastian Well. AQUIFER.--San Sebastian Formation. WELL CHARACTERISTICS.--Drilled observation well, diameter 6 in (0.15 m), cased 6 in (0.15 ii). Depth 300 ft (91.4 m). DATUM.--Elevation of land-surface datum is about 230 ft (70.1 m) above mean sea level, from topographic map. Measuring point: Shelter floor on top of 6 in (0.15 m) casing, 2.75 ft (0.84 m) above land-surface datum. Prior November 1985, top of casing, 2.40 ft (0.73 m) above land-surface datum. REMARKS.--Observation well. Automatic recorder installed on November 14, 1985. Formerly published as 182032066591800 PERIOD OF RECORD.--May 1967 to January 16, 1985. November 1985 to September 1986. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 21.95 ft (6.69 m) below land-surface datum, May 8, 1986; lowest water level recorded, 40.20 ft (12.25 m) below land-surface datum, Jan. 29, 1986. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 27.86 29.28 29.72 29.56 28.95 26.46 26.50 28.06 28.27 28.53 2 27.93 29.30 29.71 29.56 29.00 26.08 26.65 28.12 28.33 28.57 3 28.01 29.33 29.68 29.59 29.02 26.03 26.79 28.19 28.37 28.30 4 28.08 29.37 29.60 29.36 28.90 25.49 26.91 28.26 28.40 28.23 5 28.14 29.40 29.61 29.33 28.79 25.40 27.06 28.31 28.46 28.24 6 28.27 29.43 29.62 29.32 28.76 25.05 27.20 28.37 28.49 28.30 7 28.35 29.45 29.62 29.32 28.76 24.43 27.30 28.39 28.52 28.36 8 28.40 29.48 29.62 29.35 28.69 24.36 27.36 28.42 28.51 28.42 9 28.46 29.53 29.63 29.37 28.41 24.68 27.37 28.46 28.50 28.49 10 28.52 29.44 29.64 29.37 28.40 24.89 27.46 28.49 28.39 28.54 11 28.56 29.44 29.66 29.37 28.43 24.81 27.22 28.53 28.38 28.56 12 28.62 29.45 29.66 29.36 28.47 25.03 27.28 28.58 28.42 28.61 13 28.66 29.46 29.66 29.38 28.50 24.76 27.34 28.62 28.46 28.69 14 28.70 29.50 29.69 29.39 28.55 24.46 27.42 28.65 28.49 28.74 15 28.25 28.74 29.51 29.70 29.40 28.61 24.57 27.53 28.66 28.51 28.77 16 28.01 28.77 29.55 29.72 29.38 28.68 24.87 27.62 28.59 28.44 28.81 17 27.89 28.81 29.55 29.73 29.37 28.72 25.20 27.69 28.61 28.45 28.84 18 27.81 28.84 29.55 29.71 29.24 28.77 25.54 27.77 28.64 28.47 28.88 19 26.77 28.90 29.58 29.69 29.22 28.79 25.83 27.80 28.67 28.50 28.92 20 26.82 28.92 29.60 29.64 29.23 28.84 26.04 27.75 28.69 28.56 28.96 21 26.91 28.93 29.62 29.50 29.24 28.83 26.24 27.77 28.61 28.62 28.98 22 27.02 28.97 29.65 29.51 29.26 28.72 26.19 27.50 28.65 28.64 29.00 23 27.13 29.00 29.66 29.52 29.30 28.67 26.34 27.44 28.68 28.66 29.01 24 27.22 29.06 29.68 29.53 29.31 28.24 26.47 27.46 28.71 28.71 29.06 25 27.33 29.09 29.69 29.50 29.34 27.98 26.60 27.52 28.73 28.73 29.10 26 27.43 29.12 29.70 29.51 29.33 27.99 26.74 27.62 28.66 28.77 29.05 27 27.53 29.16 29.71 29.53 29.34 27.52 26.60 2'.75 28.30 28.77 29.06 28 27.61 29.18 29.76 29.56 29.33 27.41 26.45 27.82 28.29 28.68 29.08 29 27.72 29.18 29.76 29.17 26.96 26.49 27.91 28.33 28.68 28.93 30 27.77 29.23 29.77 28.95 26.74 26.35 27.98 28.36 28.62 28.95 31 29.26 29.71 28.95 26.41 28.28 28.51 LOW 29.26 29.77 29.73 29.59 29.02 26.74 27.98 28.73 28.77 29.10 HIGH 27.86 29.28 29.50 28.95 26.74 24.36 26.50 28.06 28.27 28.23 24 c;R 0 26 z< -4&• 28 LaJ > 30 z < 32 JUL AUG SEP 1985 1986 NOV DEC JAN FEB MAR APR MAY JUN 333 GROUND-WATER LEVELS RIO CULEBRINAS BASIN 182445067091700. Local number, 200 . LOCATION.--Lat 18°24'41", long 67°09'17". Owner: Carmelo Sanchez Name: Aguadilla Cement Well. AQUIFER.--Surficial deposits. WELL CHARACTERISTICS.--Abandoned water-table industrial well, diameter 4 in (0.10 m), cased 0-20 ft (0-6.10 m), perforated 11-20 ft (3.35-6.10 m). Depth 20 ft (6.10 m). DATUM.--Elevation of land-surface datum is about 10 ft (3.05 m) above mean sea level, from topographic map. Measuring point: Shelter floor on top of 4 in (0.10 m) casing, 3.25 ft (0.99 m) above land-surface datum. REMARKS.--Observation well. Automatic recorder installed on November 1985. Water levels affected by nearby pumping well. Estimated noon values: Nov. 19-Dec 5. PERIOD OF RECORD.--October 1985 to September 1986. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 2.85 ft (0.87 m) below land-surface datum, May 14, 1986; lowest water level recorded, 8.46 ft (2.58 m) below land-surface datum, Apr. 17, 1986. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATION Water Water Date level Date level Oct. 09 3.27 Nov. 14 4.75 WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 6.41 6.66 8.21 7.88 5.57 5.79 5.52 6.21 2 6.55 6.66 8.23 7.96 5.08 5.83 5.70 6.34 3 6.70 6.66 8.26 8.02 5.31 6.16 5.78 6.44 4 6.84 6.66 --- 8.26 8.08 3.89 5.86 5.91 6.28 5 7.02 6.66 7.72 8.26 8.00 4.16 5.94 5.98 6.35 6 7.00 6.66 7.78 8.27 8.07 4.25 5.97 5.99 6.36 7 7.07 6.67 7.86 8.29 8.15 3.56 5.78 6.08 6.41 8 7.14 6.75 7.87 8.30 8.20 3.75 5.56 6.39 6.47 9 7.17 6.78 7.91 8.22 8.23 4.02 5.95 6.15 6.59 10 7.20 6.88 7.95 8.23 8.25 4.14 6.18 5.66 6.63 11 7.21 6,90 7.97 8.27 8.29 4.21 6.04 5.90 6.64 12 7.26 --- 8.00 8.15 8.32 4.52 5.97 5.34 6.67 13 7.29 8.05 8.19 8.34 3.72 6.01 5.72 6.70 14 --- 7.37 8.04 8.23 8.38 3.02 6.12 5.62 6.72 15 4.70 7.40 8.07 8.27 8.41 3.28 5.97 5.88 6.77 16 4.22 7.41 8.09 8.27 8.43 3.33 6.36 5.86 6.81 17 3.91 7.42 8.09 8.10 7.35 3.50 6.17 5.91 6.83 18 4.13 7.43 8.11 8.10 6.80 3.57 5.98 6.03 6.87 19 4.66 7.42 8.11 8.18 6.85 4.21 6.03 6.46 6.91 20 4.80 7.47 8.13 8.22 6.91 4.05 6.09 6.64 6.94 21 4.95 7.49 8.15 8.26 7.00 3.93 6.02 6.32 6.96 22 5.09 7.48 8.15 8.28 7.06 4.10 6.21 6.17 7.00 23 5.24 7.48 8.15 8.30 7.10 3.85 6.18 6.19 7.05 24 5.38 7.50 8.17 8.34 7.13 4.02 6.32 6.24 7.07 25 5.53 7.55 8.18 8.36 6.97 4.22 6.23 6.30 7.09 26 5.68 7.57 8.19 8.37 7.03 6.31 6.37 6.72 27 5.82 7.50 8.20 8.38 6.70 --- 6.31 6.53 6.81 28 5.97 7.40 8.21 8.39 6.24 5.55 6.29 6.01 6.89 29 6.11 7.40 --- 8.09 5.92 5.62 6.77 6.08 6.94 30 6.26 7.43 7.92 5.45 5.75 5.55 6.08 6.99 31 --- 7.56 7.88 --- --- 5.37 6.11 --- LOW 7.57 8.39 8.43 6.77 6.64 7.09 HIGH 6.41 7.88 5.45 5.37 5.34 6.21 2 Lai co 4 1:4 ta< t z < 6 > 8 0 crz 10 NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1985 1986 Surf ace- Water Records for U.S. Virgin Islands I I I I I I I I I 337 ST. THOMAS, U.S. VIRGIN ISLANDS 50252000 BONNE RESOLUTION GUT AT BONNE RESOLUTION, ST. THOMAS, VI LOCATION.--Lat 18°21'57", long 64°57'34", Hydrologic Unit 21020001, on right bank near Hull Bay Road, 0.5 i (0.8 km) upstream from Atlantic Ocean, and 2.5 mi (4.02 km) northwest of Fort Christian, Charlotte Amalie. DRAINAGE AREA.--0.49 mi' (1.27 km2). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--December 1962 to February 1967, March 1979 to April 1981, May 1982 to current year. GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 280 ft (85 m), from topographic map. December 1962 to February 1967 at site about 100 ft (30 ) downstream at different datum. March 1979 to April 1981 at site about 100 ft (30 ) upstream at different datum. REMARKS.--Estimated daily discharges: Nov. 26 to Dec. 6 and June 6-30. Records poor. AVERAGE DISCHARGE.--8 years (1964-66, 1980, 1983-86), 0.29 ft'/s (0.008 3/s), 8.04 in/yr (204 m/yr), 210 acre-ft/yr (0.259 110/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 1,650 ft'is (46.7 m 3/s), Apr. 18, 1983, gage height, 7.00 ft (2.134 ), from floodmarks, from rating curve extended above 1.0 ft'/s (0.03 '/s) on basis of critical-depth analysis and slope-area measurement of peak flow; no flow at times in most years. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 50 ft'/s (1.42 '/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (m'/s) (ft) (m) Date Time (ft'/s) (m0/s) (ft) (m) Oct. 6 0230 58 1.64 1.52 0.463 Nov. 17 1600 118 3.34 1.98 0.604 Oct. 29 2300 *559 15.8 *4.02 1.225 Apr. 29 2345 56 1.59 1.50 0.457 Oct. 30 1915 56 1.59 1.50 0.457 May 13 1830 191 5.41 2.42 0.738 Nov. 5 1000 556 15.7 4.01 1.222 No flow any days. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 .06 .67 .10 .03 .00 .11 .05 1.1 .40 .08 .08 .17 2 .06 .40 .09 .03 .00 .12 .06 .43 .40 .07 .10 .09 3 .05 .28 .08 .03 .00 .11 .03 .50 .40 .09 .12 .07 4 .06 .20 .07 .03 .00 .07 .01 .17 .40 .09 .13 .07 5 .44 32 .08 .02 .00 .08 .00 .08 .30 .08 .13 .09 6 20 .94 .07 .02 .00 .09 .00 .06 .30 .08 .11 .07 7 5.6 .44 .06 .02 .00 .11 .00 .96 .25 .09 .04 .05 8 1.0 .32 .05 .01 .00 .12 .00 .91 .25 .09 .08 .05 9 .44 .22 .06 .05 .00 .13 .01 .15 .25 .08 .07 .05 10 .29 .15 .06 .03 .00 .15 .01 3.2 .30 .08 .02 .04 11 .15 .13 .06 .02 .00 .13 .02 1.6 .25 .08 .08 .04 12 .10 .76 .06 .01 .00 .10 .01 .25 .20 .06 .07 .03 13 .07 .36 .06 .01 .01 .09 .01 13 .25 .19 .10 .03 14 .05 .25 .05 .01 .01 .08 .02 2.2 :20 .04 .24 .03 15 .05 1.0 .05 .01 .01 .06 .02 .55 .30 .09 .08 .03 16 .05 4.4 .05 .01 .01 .05 .01 .40 .25 .07 .11 .03 17 .05 8.2 .05 .01 .01 .05 .01 .40 .20 .09 .07 .02 18 .07 .94 .05 .01 .00 .03 .02 .41 .17 .13 .07 .02 19 .05 .36 .07 .01 .00 .02 .02 .41 .20 .13 .06 .02 20 .05 .28 .05 .01 .00 .02 .02 .40 .17 .13 .06 .02 21 .05 .25 .06 .01 .00 .01 .03 .40 .15 .07 .06 .02 22 .05 .22 .05 .01 .01 .01 .02 .33 .14 .06 .06 .02 23 .05 .20 .05 .01 .01 .01 .02 .42 .13 .07 .05 .00 24 3.8 .15 .04 .02 .02 .00 .02 .40 .12 .10 .05 .00 25 1.4 .12 .04 .01 .03 .00 .01 .33 .11 .09 .06 .00 26 .43 .14 .04 .01 .04 .00 .02 .30 .10 .06 .05 .04 27 2.4 .12 .04 .01 .05 .00 .00 .33 .15 .07 .05 .05 28 3.3 .11 .07 .01 .05 .00 2.9 .41 .11 .07 .07 .05 29 29 .10 .05 .01 --- .00 3.2 .41 .09 .06 .17 .05 30 21 .15 .03 .01 .00 3.6 .41 .08 .08 .06 .05 31 5.5 --- .02 .00 .00 --- .40 --- .08 .06 --- TOTAL 95.67 53.86 1.76 .49 .26 1.75 10.15 31.32 6.62 2.65 2.56 1.30 MEAN 3.09 1.80 .06 .02 .01 .06 .34 1.01 .22 .08 .08 .04 MAX 29 32 .10 .05 .05 .15 3.6 13 .40 .19 .24 .17 MIN .05 .10 .02 .00 .00 .00 .00 .06 .08 .04 .02 .00 CFSM 6.31 3.67 .12 .03 .02 .11 .69 2.06 .45 .17 .17 .09 IN. 7.26 4.09 .13 .04 .02 .13 .77 2.38 .50 .20 .19 .10 AC-FT 190 107 3.5 .0 .5 3.5 20 62 13 5.3 5.1 2.6 CAL YR 1985 TOTAL 163.05 MEAN .45 MAX 32 MIN .01 CFSM .92 IN. 12.38 AC-FT 323 WTR YR 1986 TOTAL 208.39 MEAN .57 MAX 32 MIN .00 CFSM 1.16 IN. 15.82 AC-FT 413 I I I I I 338 ST. THOMAS, U.S. VIRGIN ISLANDS 50276000 TURPENTINE RUN AT MARIENDAL, ST. THOMAS, VI LOCATION.--Lat 18°19'48', long 64°52'58", Hydrologic Unit 21020001, on right bank, at Mariendal, 1.0 mi (1.6 ka) upstream from mouth, and 3.3 mi (5.3 km) southeast of Fort Christian, Charlotte Amalie. DRAINAGE AREA.--2.97 mil (7.69 km 2 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--January 1963 to April 1969, October 1978 to September 1980, June 1982 to July 1986, July to Sept. 1986 (high-water discharges only). GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 40 ft (12 m), fro topographic map. REMARKS.--Estimated daily discharges: June 7 to July 2. Records poor. Since about 1975, low flow augmented by discharges from sewage plant. AVERAGE DISCHARGES.--10 years (1964-68, 1979-80, 1983-85), 1.22 ft'is (0.034 10/s), 5.58 in/yr (142 m /yr), 884 acre-ft/yr (1.09 hm'/yr); median of yearly mean discharges, 0.54 ft'is (0.015 m'/s), 390 acre-ft/yr (0.48 hm'/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 9,710 ft'is (275 '/s), Apr. 18, 1983, gage height, 11.09 ft (3.380 ), from floodmark, from rating curve extended above 500 ft'is (14.2 m'/s) on basis of slope area measurement and step-backwater analysis; no flow many days from 1963 to 1969, and in 1984. EXTREMES FOR CURRENT PERIOD.--Peak discharges greater than base discharge of 106 WA (2.83 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (W/s) (10/s) (ft) (m) Date Time (W/s) 00/s) (ft) (m) Oct. 6 0300 138 3.91 2.69 0.820 Nov. 16 0715 118 3.34 2.53 0.771 Oct. 24 1800 346 9.80 3.92 1.195 Apr. 28 2100 490 13.9 4.45 1.356 Oct. 25 2300 537 15.2 4.59 1.399 Apr. 29 1315 *2,050 58.1 *6.45 1.966 Oct. 28 1445 168 4.76 2.92 0.890 Apr. 30 0015 1,440 40.8 5.97 1.820 Nov. 5 1000 193 5.47 3.09 0.942 May 3 0545 147 4.16 2.76 0.841 Nov. 12 1215 253 7.16 3.45 1.052 May 7 2045 348 9.86 3.93 1.198 Nov. 14 2115 302 8.55 3.71 1.131 May 18 0730 257 7.28 3.47 1.058 Minimum discharge, 0.09 ft'is (0.002 '/s), Mar. 24, Apr. 10, 11. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 .67 2.7 1.7 .90 .24 .32 .22 7.8 4.8 .90 2 .61 1.7 1.6 .97 2.3 .43 .29 5.1 5.4 .85 3 .65 1.1 1.5 .85 .33 .28 .37 30 3,6 .83 4 1.1 1.1 1.5 .95 .28 .32 .42 15 2.8 .76 5 7.8 22 1.6 .90 .22 .34 .62 5.8 2.4 .74 6 79 5.0 1.5 .76 .18 .44 .57 4.3 2.4 .87 7 29 2.1 1.4 .59 .30 .30 .36 37 2.3 .75 8 7.7 1.4 1.6 .62 .29 .37 .47 18 2.2 --- 9 3.3 1.0 1.5 1.4 .26 .45 .40 5.8 3,0 10 1.6 .86 1.3 .89 .28 .33 .11 8.0 4.0 11 .87 .80 2.0 .75 .43 .41 .16 26 2.5 12 .75 38 1.5 .73 .30 .40 .18 8.4 3.5 13 .71 16 1.1 .57 .25 .48 .39 12 4.0 14 .71 40 1.2 .56 .35 .57 .35 13 3.0 15 .53 30 1.2 .52 .35 .60 .23 6.3 5.0 16 .51 39 1.1 .49 .67 .59 .39 4.8 4.0 17 .54 13 .91 .77 .99 .47 .52 4.6 3.5 18 4.8 8.4 .92 .58 .32 .45 .56 29 2.0 19 1.7 4.6 .99 .55 .35 .43 .69 7.7 2.5 20 .95 6.6 1.1 '.52 .25 .36 .45 4.8 1.9 21 .75 4.1 1.1 .40 .31 .37 .22 8.0 1.7 22 .63 3.1 1.0 .43 .37 .39 .62 4.8 1.6 23 1.0 2.8 .82 .35 .38 .46 .70 4.0 1.5 24 58 2.4 .77 1.4 .23 .18 .35 3.5 1.5 25 35 2.0 .80 .56 .27 .34 .56 3.3 1.4 26 29 2.1 .79 .58 .27 .34 .71 3.2 1.3 27 17 1.9 .74 .38 .27 .34 .80 3.0 3.5 28 40 1.9 .80 .37 .26 .55 82 4.4 1.5 29 25 1.7 .97 .28 --- .47 183 2.6 1.3 30 25 2.1 .69 .27 .34 87 2.4 1.1 31 6.7 --- .74 .24 .42 --- 12 --- TOTAL 381.58 259.46 36.44 20.13 11.30 12.54 363.71 304.6 81.2 MEAN 12.3 8.65 1.18 .65 .40 .40 12.1 9.83 2.71 MAX 79 40 2.0 1.4 2.3 .60 183 37 5.4 MIN .51 .80 .69 .24 .18 .18 .11 2.4 1.1 CFSM 4.14 2.91 .40 .22 .13 .13 4.07 3.31 .91 IN. . 4.78 3.25 .46 .25 .14 .16 4.56 3.82 1.02 AC-FT 757 515 72 40 22 25 721 604 161 CAL yR 1985 TOTAL 877.112 MEAN 2.40 MAX 79 MIN .17 CFSM .81 IN. 10.99 AC-FT 1740 I I I I 339 ST. JOHN, U.S. VIRGIN ISLANDS 50295000 GUINEA GUT AT BETHANY, ST. JOHN, VI LOCATION.--Lat. 18°19'55', long 64°46'50% Hydrologic Unit 21020001, 600 ft (183 ) southeast of Bethany Church, and 1.0 i (1.6 km) east of Government House at Cruz Bay. DRAINAGE AREA.--0.37 mi' (0.96 km2). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--January 1963 to October 1967, September 1982 to current year. GAGE.--Water-stage recorder and concrete control. Elevation of gage is 260 ft (79 m), from topographic nap. Prior to September 1982, at datum 1.00 ft (0.30 ) higher. REMARKS.--No estimated daily discharges during water year. Records poor. AVERAGE DISCHARGE.--8 years (1964-67, 1983-86), 0.10 ft'/s (0.003 m'/s), 3.60 in/yr (91 mm/yr), 71.00 acre-ft/yr (0.088 hm'/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 946 ft'/s (26.8 m 3/s), Apr. 18, 1983, gage height. 5.33 ft (1.625 m), from floodmark, from rating curve extended above 1.0 ft'/s (0.028 '/s) on basis of step-backwater analysis and slope-area measurement of peak flow; no flow many days each year. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 10 ft'is (0.283 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (10/s) (ft) (m) Date Time (ft'/s) (e/s) (ft) (m) Oct. 30 0115 34 0.96 2.34 0.713 May 13 1430 14 0.40 2.09 0.637 Apr. 30 0015 52 1.47 2.47 0.753 May 17 2030 19 0.54 2.17 0.661 May 3 0730 32 0.91 2.32 0.707 May 18 0630 *206 5.83 *3.29 1.003 No flow many days. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 .01 .07 .04 .01 .01 .00 .00 .04 .02 .02 .02 .02 2 .01 .06 .03 .01 .01 .00 .00 .00 .02 .02 .02 .02 3 .01 .06 .02 .01 .01 .00 .00 2.5 .02 .02 .02 .02 4 .01 .06 .02 .01 .01 .00 .00 .02 .02 .02 .02 .02 5 .01 .06 .01 .01 .00 .00 .00 .00 .02 .02 .02 .03 6 .43 .06 .01 .01 .00 .00 .00 .00 .03 .02 .02 .04 7 .15 .06 .01 .01 .00 .00 .00 .90 .02 .02 .02 .03 8 .01 .06 .01 .01 .00 .00 .00 .38 .02 .02 .02 .03 9 .01 .06 .01 .01 .00 .00 .00 .02 .02 .02 .02 .04 10 .01 .06- .01 .01 .00 .00 .00 .62 .02 .02 .02 .04 11 .00 .06 .01 .01 .00 .00 .00 3.6 .02 .02 .02 .04 12 .00 .11 .01 .01 .00 .00 .00 .53 .02 .02 .02 .04 13 .00 .16 ' .01 .01 .00 .00 .00 3.0 .02 .02 .02 .05 14 .00 .23 .01 .01 .00 .00 .00 2.7 .02 .02 .02 .05 15 .00 .27 .01 .01 .00 .00 .00 .23 .02 .04 .02 .04 16 .00 .56 .01 .01 .00 .00 .00 .04 .02 .05 .02 .03 17 .00 .12 .01 .01 .00 .00 .00 1.9 .02 .04 .02 .02 18 .01 .06 .02 .01 .00 .00 .00 9.3 .02 .04 .02 .03 19 .01 .06 .02 .01 .00 .00 .00 .79 .02 .03 .02 .03 20 .01 .10. .01 .01 .00 .00 .00 .05 .02 .03 .02 .03 21 .00 .05 .01 .01 .00 .00 .00 .69 .02 .02 .02 .04 22 .00 .05 .01 .01 .00 .00 .00 .05 .02 .02 .02 .04 23 .00 .05 .01 .01 .00 .00 .00 .01 .02 .01 .02 .05 24 .01 .04 .01 .01 .00 .00 .00 .01 .02 .01 .02 .05 25 .01 .04 .01 .01 .00 .00 .00 .01 .02 .01 .02 .05 26 .02 .04 .01 .01 .00 .00 .00 .02 .02 .01 .02 .06 27 .04 .04 .01 .01 .00 .00 .00 .03 .02 .01 .02 .06 28 .04 .04 .01 .C1 .00 .00 .09 .02 .02 .01 .02 .06 29 .06 .04 .01 .00 .00 .73 .02 .02 .01 .02 .06 30 5.1 .04 .01 .00 .00 4.3 .02 .02 .01 .02 .05 31 1.1 --- .01 .00 .00 --- .03 --- .02 .02 --- TOTAL 7.07 2.77 .40 .28 .04 .00 5.12 27.53 .61 .65 .62 1.17 MEAN .23 .09 .01 .01 .00 .00 .17 .89 .02 .02 .02 .04 MAX 5.1 .56 .04 .01 .01 .00 4.3 9.3 .03 .05 .02 .06 MIN .00 .04 .01 .00 .00 .00 .00 .00 .02 .01 .02 .02 CFSM .62 .25 .04 .02 .00 .00 .46 2.41 .05 .06 .05 .11 IN. .71 .28 .04 .03 .00 .00 .51 2.77 .06 .07 .06 .12 AC-FT 14 5.5 .8 .6 .08 .00 10 55 1.2 1.3 1.2 2.3 CAL YR 1985 TOTAL 13.47 MEAN .04 MAX 5.1 MIN .00 CFSM .10 IN. 1.35 AC-FT 27 WTR YR 1986 TOTAL 46.26 MEAN .13 MAX 9.3 MIN .00 CFSM .35 IN. 4.65 AC-FT 92 ST. CROIX, U.S. VIRGIN ISLANDS 50345000 JOLLY HILL GUT AT JOLLY HILL, ST. CROIX, VI LOCATION.--Lat 17°44'00", long 64°51'47", Hydrologic Unit 21020002, on Mahogany koad at Jolly Hill, 1.8 mi (2.9 km) northeast of Frederiksted. DRAINAGE AREA.--2.10 mi 2 (5.44 km2). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--January 1963 to December 1968. Monthly measurements, 1962, 69. October 1982 to current year. GAGE.--Water-stage recorder, crest-stage gage and sharp-crested concrete control. Elevation of gage is 140 ft (43 m), from topographic map. REMARKS.--Estimated daily discharges: Nov. 26 to Dec. 10. Records poor. AVERAGE DISCHARGE.--9 years (1964-68, 1983-86), 0.107 ft'/s (0.003 m/'s), 0.69 in/yr (17.5 mm/yr). 77.5 acre-ft/yr (0.10 he/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 288 ft'is (8.156 m'/s), Nov. 7, 1984, gage height, 3.62 ft (1.103 m); no flow many days each year. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 25 ft'is (0.71 m 3/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (20/s) (ft) (m) Date Time (W/s) (e/s) (ft) (m) Oct. 6 1730 *118 3.34 *2.81 0.856 Nov. 12 1800 46 1.30 2.26 0.689 No flow many days. DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 .00 .99 1.1 .49 .28 .14 .06 .08 .19 .11 .07 .01 2 .00 1.4 1.1 .47 .26 .14 .06 .08 .20 .11 .05 .01 3 .00 1.3 1.0 .45 .26 .14 .06 .08 .20 .11 .05 .01 4 .00 1.5 1.0 .44 .26 .13 .07 .08 .20 .11 .06 .00 5 .00 1.5 .95 .44 .26 .13 .18 .08 .20 .11 .16 .00 6 8.2 1.5 .90 .44 .25 .13 .13 .10 .20 .11 .18 .00 7 3.9 1.3 .90 .43 .23 .13 .09 .09 .20 .11 .15 .00 8 1.2 1.2 .86 .41 .22 .13 .09 .09 .20 .10 .04 .00 9 .54 1.2 .86 .67 .22 .13 .09 .08 .20 .10 .02 .00 10 .51 1.2 .78 .52 .22 .13 .09 .20 .19 .1C .02 .00 11 .49 1.2 .71 .49 .21 .13 .08 .27 .18 .10 .03 .00 12 .49 5.6 .76 .46 .20 .13 .08 .16 .48 .10 .03 .00 13 .41 3.7 .68 .45 .19 .13 .08 .14 1.1 .10 .03 .00 14 .33 2.7 .64 .43 .18 .13 .08 .14 .98 .10 .06 .00 15 .33 2.5 .64 .41 .18 .13 .08 .13 .74 .0, ..' .02 .00 16 .33 2.4 .66 .41 .19 .12 .08 .14 .15 .09 .02 .00 17 .39 2.6 .61 .41 .19 .10 .08 .15 .18 .09 .02 .00 18 .40 2.5 .62 .42 .18 .10 .08 .18 .11 .09 .02 .00 19 .38 2.2 .62 .41 .16 .10 .08 .18 .11 .09 .01 .00 20 .37 2.4 .62 .40 .16 .10 .08 .18 .11 .09 .01 .00 21 .37 2.3 .61 .39 .16 .10 .07 .18 .11 .08 .01 .00 22 .37 1.9 .63 .38 .16 .10 .07 .18 .11 .08 .00 .00 23 .41 1.8 .61 .37 .14 .09 .06 .18 .11 .07 .00 .00 24 .42 1.7 .60 .36 .14 .09 .06 .18 .11 .07 .00 .04 25 .48 1.5 .57 .34 .14 .09 .06 .19 .11 .08 .00 .07 26 .54 1.5 .57 .32 .14 .09 .06 .20 .11 .08 .00 .03 27 .52 1.4 .56 .31 .14 .09 .06 .20 .11 .08 .00 .00 28 .67 1.4 .55 .31 .14 .09 .08 .27 .11 .08 .01 .00 29 1.7 1.2 .54 .31 --- .07 .07 .20 .11 .07 .02 .00 30 1.2 1.2 .51 .30 .07 .08 .19 .11 .07 .01 .00 31 1.0 --- .49 .29 .06 --- .18 --- .06 .03 --- TOTAL 25.95 56.79 22.25 12.73 5.46 3.44 2.39 4.78 7.22 2.83 1.13 .17 MEAN .84 1.89 .72 .41 .19 .11 .08 .15 .24 .0.) .04 .01 MAX 8.2 5.6 1.1 .67 .28 .14 .18 .27 1.1 .11 .18 .07 MIN .00 .99 .49 .29 .14 .06 .06 .08 .11 .06 .00 .00 CFSM .40 .90 .34 .20 .09 .05 .04 .07 .11 .04 .02 .00 IN. .46 1.01 .39 .23 .10 .06 .04 .08 .13 .05 .02 .00 AC-FT 51 113 44 25 11 6.8 4.7 9.5 14 5.5 2.2 .3 CAL YR 1985 TOTAL 132.68 MEAN .36 MAX 8.2 MIN .00 CFSM .17 IN. 2.35 AC-FT 263 WTR YR 1986 TOTAL 145.14 MEAN .40 MAX 8.2 MIN .00 CFSM .19 IN. 2.57 AC-FT 288 340 Ground-Water Records for U.S. Virgin Islands GROUND-WATER LEVELS ST. CROIX, U.S. VIRGIN ISLANDS 174225064471900. Local number, 1. LOCATION.--Lat 17°42'25", long 64°47'19". Owner: Virgin Islands Government. Name: Fairplains 6 (FP6). AQUIFER.--Alluvium and marl. WELL CHARACTERISTICS.--Drilled public supply water-table well, diameter 6 in (0.15 m), cased 6 in (0.15 m). DATUM.--Elevation of land-surface datum is about 20 ft (6.10 m) above mean sea level, from topographic map. Measuring point: Top of pump concrete base, 2.20 ft (0.67 m) above land-surface datum. REMARKS,--Observation well. Water levels affected by pumping. PERIOD OF RECORD.--March 1982 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 15.64 ft (4.77 m) below land-surface datum, Mar. 25, 1982; lowest water level measured, a58.57 ft (17.9 m) below land-surface datum, June 20, 1983. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Dec. 10 a58.03 Feb. 24 17.38 Apr. 29 17.37 June 30 16.10 a Pumping. 343 344 GROUND-WATER LEVELS ST. CROIX, U.S. VIRGIN ISLANDS 174225064472000. Local number, 2. LOCATION.--Lat 17°42'25", long 64°47'20". Owner: U.S. Government, Virgin Islands Government. Name: USGS-10, Fairplains 2 (FP2). AQUIFER.--Alluvium and marl. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 6 in (0.15 m), caed 6 in (0.15 m). DATUM.--Elevation of land-surface datum is about 20 ft (6.10 m) above mean sea level, from topographic map. Measuring point: Top of 0.5 in (0.01 m) hole at concrete base wall, 3.00 ft (0.91 m) above land-surface datum. REMARKS.--Recording observation well. Nearby pumping well. PERIOD OF RECORD.--June 1983 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 20.91 ft (6.37 m) below land-surface datum, Nov. 27, 29, 1985; lowest water level recorded, 25.02 ft (7.63 m) below land-surface datum, Aug. 22, 1984. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 23.31 21.87 21.45 21.70 21.95 22.43 22.10 22.14 21.81 21.77 22.08 22.33 2 23.30 21.85 21.54 21.74 21.96 22.46 22.11 22.20 21.79 21.75 22.06 22.29 3 23.26 21.81 21.61 21.77 21.98 22.40 22.10 22.23 21.82 21.81 22.05 22.36 4 23.24 21.72 21.65 21.81 21.94 22.37 22.07 22.21 21.81 21.81 22.09 22.64 5 23.16 21.65 21.69 21.85 21.91 22.42 22.07 22.22 21.84 21.73 22.09 22.83 6 23.01 21.61 21.72 21.87 21.90 22.44 22.02 22.23 21.84 21.69 22.18 22.96 7 22.92 21.54 21.76 21.81 21.90 22.48 22.03 22.22 21.84 21.68 22.12 23.02 8 22.78 21.49 21.75 21.88 21.89 22.51 22.01 22.23 21.84 21.71 22.10 23.10 9 22.72 21.52 21.76 21.94 21.88 22.51 21.94 22.20 21.85 21.68 22.17 23.20 10 22.74 21.52 21.88 21.83 21.89 22.41 21.91 22.17 21.83 21.70 22.19 23.28 11 22.72 21.51 22.04 21.76 21.93 22.37 21.90 22.13 21.80 21.75 22.14 23.34 12 22.69 21.51 22.10 21.79 21.93 22.42 21.91 22.07 21.78 21.81 22.07 23.43 13 22.58 21.41 21.96 21.75 21.90 22.45 21.90 22.00 21.77 21.85 22.10 23.50 14 22.49 21.30 21.60 21.74 21.91 22.47 21.95 22.00 21.77 21.86 22.11 23.35 15 22.39 21.23 21.50 21.76 21.90 22.53 21.92 21.95 21.77 21.79 22.09 23.41 16 22.43 21.17 21.44 21.73 22.00 22.49 21.92 21.94 21.79 21.77 22.08 23.47 17 22.45 21.15 21.42 21.71 22.05 22.40 21.93 21.93 21.79 21.83 22.02 23.58 18 22.44 21.12 21.39 21.70 21.96 22.35 21.90 21.92 21.80 21.88 21.97 23.64 19 22.43 21.11 21.47 21.69 21.93 22.32 21.90 21.92 21.85 21.91 21.98 23.63 20 22.42 21.07 21.55 21.68 21.93 22.33 21.90 21.95 21.89 21.89 22.06 23.67 21 22.42 21.05 21.58 21.65 21.96 22.29 21.91 21.97 21.86 21.93 22.18 23.69 22 22.41 21.03 21.62 21.64 21.96 22.27 21.94 21.97 21.88 21.93 22.15 23.70 23 22.40 21.01 21.65 21.75 22.07 22.23 21.92 21.91 21.91 21.91 22.17 23.73 24 22.38 20.95 21.69 21.83 22.11 22.21 21.95 21.87 21.88 22.01 22.23 23.74 25 22.35 20.94 21.71 21.88 22.11 22.18 22.11 21.84 21.87 22.05 22.23 23.68 26 22.34 20.94 21.74 21.88 22.19 22.10 22.16 21.81 21.85 22.04 22.25 23.82 27 22.32 20.93 21.73 21.82 22.27 22.12 22.23 21.79 21.86 22.00 22.40 23.80 28 22.30 21.10 21.69 21.79 22.36 22.11 22.15 21.78 21.88 21.98 22.35 23.82 29 22.16 21.12 21.61 21.87 22.11 22.10 21.77 21.81 21.98 22.30 23.85 30 22.08 21.28 21.55 21.90 22.11 22.14 21.81 21.80 22.06 22.31 23.87 31 21.96 21.64 21.92 22.11 21.82 22.11 22.30 LOW 23.31 21.87 22.10 21.94 22.36 22.53 22.23 22.23 21.91 22.11 22.40 23.87 HIGH 21.96 20.93 21.39 21.64 21.88 22.10 21.90 21.77 21.77 21.68 21.97 22.29 WTR YR 1986 MEAN 22.1 LOW 23.87 HIGH 20.93 9 20 La aIR 14:1 22 za >I) 24 crz 4 26 ONDJFMAMJJASONDJFMAMJJASONDJFMAMJJAS 1983 1984 1985 1986 345 GROUND-WATER LEVELS ST. CROIX, U.S. VIRGIN ISLANDS 174243064475100. Local number, 3. LOCATION.--Lat 17°42'43", long 64°47'51". Owner: U.S. Government, Virgin Islands Government. Name: Golden Grove-6 (PW6). AQUIFER.--Alluvium and marl. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 8 in (0.20 m), cased 8 in (0.20 m). DATUM.--Elevation of land-surface datum is about 40 ft (12.2 m) above mean sea level, from topographic map. Measuring point: Upper edge of hole at 8 in (0.20 m) casing, 4.20 ft (1.28 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--March 1982 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 14.76 ft (4.50 m) below land-surface datum, Mar. 25, 1982; lowest water level recorded, 28.67 ft (8.74 m) below land-surface datum, Oct. 6, 1985. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 28.62 22.44 21.03 23.37 24.65 25.39 26.11 26.75 25.91 26.68 27.27 27.79 2 28.63 22.15 21.18 23.42 24.66 25.41 26.15 26.77 25.93 26.71 27.29 27.80 3 28.64 21.98 21.29 23.47 24.67 25.45 26.18 26.79 25.95 26.74 27.30 27.81 4 28.65 21.90 21.40 23.54 24.72 25.47 26.20 26.81 25.96 26.76 27.30 27.82 5 28.66 21.90 21.48 23.60 24.76 25.50 26.21 26.83 25.99 26.78 27.33 27.83 6 28.67 21.92 21.56 23.64 24.79 25.52 26.22 26.85 26.02 26.80 27.35 27.84 7 28.52 21.95 21.67 23.69 24.81 25.55 26.23 26.86 26.04 26.82 27.36 27.86 8 27.96 22.03' 21.79 23.74 24.84 25.58 26.25 26.87 26.05 26.84 27.38 27.87 9 27.34 22.12 21.86 23.81 24.87 25.61 26.27 26.89 26.09 26.86 27.39 27.88 10 26.96 22.18 21.95 23.84 24.91 25.63 26.29 26.92 26.13 26.87 27.42 27.89 11 26.71 22.25 22.02 23.87 24.94 25.64 26.31 26.93 26.16 26.89 27.44 27.90 12 26.54 22.36 22.14 23.90 24.96 25.66 26.32 26.81 26.19 26.91 27.46 27.91 13 26.39 21.98 22.22 23.93 24.98 25.67 26.33 26.39 26.21 26.93 27.47 27.93 14 26.30 20.90 22.28 23.99 25.01 25.68 26.37 26.08 26.22 26.95 27.49 27.94 15 26.25 20.32 22.34 24.07 25.03 25.69 26.40 25.89 26.25 26.96 27.50 27.95 16 26.20 20.10 22.43 24.07 25.06 25.70 26.43 25.73 26.28 26.97 27.52 27.96 17 26.16 20.05 22.50 24.10 25.09 25.72 26.47 25.67 26.30 26.98 27.54 27.97 18 26.12 19.85 22.56 24.14 25.11 25.74 26.49 25.61 26.32 27.00 27.56 27.99 19 26.10 19.68 22.63 24.19 25.14 25.76 26.50 25.56 26.35 27.01 27.57 28.01 20 26.10 19.65' 22.69 24.22 25.16 25.80 26.52 25.55 26.40 27.04 27.58 28.03 21 26.09 19.73 22.73 24.24 25.18 25.82 26.55 25.55 26.43 27.06 27.58 28.05 22 26.12 19.83 22.80 24.27 25.20 25.87 26.56 25.57 26.47 27.06 27.59 28.07 23 26.15 19.93 22.87 24.31 25.25 25.91 26.58 25.60 26.49 27.11 27.61 28.08 24 26.18 20.05 22.94 24.35 25.29 25.93 26.59 25.64 26.51 27.13 27.62 28.09 25 26.20 20.18 22.99 24.39 25.30 25.95 26.60 25.67 26.54 27.15 27.65 28.11 26 26.09 20.35 23.05 24.43 25.32 25.96 26.62 25.69 26.56 27.17 27.67 28.12 27 25.86 20.51 23.11 24.48 25.34 25.98 26.65 25.73 26.58 27.19 27.69 28.14 28 25.69 20.66 23.15 24.52 25.38 26.01 26.68 25.77 26.59 27.20 27.71 28.16 29 25.20 20.78 23.20 24.54 26.04 26.70 25.80 26.61 27.22 27.74 28.17 30 24.12 20.90 23.26 24.59 26.06 26.73 25.84 26.65 27.24 27.76 28.19 31 23.14 23.30 24.61 26.09 25.88 27.25 27.77 LOW 28.67 22.44 23.30 24.61 25.38 26.09 26.73 26.93 26.65 27.25 27.77 28.19 HIGH 23.14 19.65 21.03 23.37 24.65 25.39 26.11 25.55 25.91 26.68 27.27 27.79 WTR YR 1986 MEAN 25.5 LOW 28.67 HIGH 19.65 • 17 Lchj • 20 z 23 _Jcg > • 26 tzz 29 ONDJ FMAMJJ ASONDJFMAMJJ ASONDJFMAMJJ AS 1983 1984 1985 1986 GROUND-WATER LEVELS ST. CROIX, U.S. VIRGIN ISLANDS 174245064475800. Local number, 4. LOCATION.--Lat 17°42'45", long 64°47'58". Owner: Virgin Islands Government. Name: Golden Grove - 1 (PW1). AQUIFER.--Alluvium and marl. WELL CHARACTERISTICS.--Drilled production water-table well, diameter 6 in (0.15 m), cased 6 in (0.15 m), 0-104 ft (0-31.70 m), perforated 64-104 ft (19.51-31.70 m). Depth 104 ft (31.70). DATUM.--Elevation of land-surface datum is about 40 ft (12.2 m) above mean sea level, from topographic map. Measuring point: Lower edge of 1 in. (0.02 m) pipe at pump base, 3.40 ft (1.04 m) above land-surface datum. REMARKS.--Observation well. Water levels affected by pumping. PERIOD OF RECORD.--January 1983 to current year. EXTREMES FOR PERIOD OF RECORD: Highest water level measured, 23.09 ft (7.04 m) below land-surface datum, May 18, 1983; lowest water level measured, a58.30 ft (17.77 m) below land-surface datum, September 27, 1983. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Dec. 10 a45.05 Feb. 25 27.12 Apr. 29 a 48.03 June 30 a56.03 174336064523200. Local number, 5. LOCATION.--Lat 17°43'36", long 64°52'32". Owner: Virgin Islands Government. Name: Mahogany Road 3. AQUIFER.--Alluvium of Quaternary age and volcanic rocks of Cretaceous age. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 6 in (0.15 m), cased 6 in (0.15 m), 0-104 ft (0-31.70 m), perforated 64-104 ft (19.51-31.70 m). Depth 104 ft (31.70 m). DATUM.--Elevation of land-surface datum is 70 ft (21.3 m) above mean sea level, from topographic map. Measuring point: Lower edge of 2 in. (0.05 m) pipe at pump base, 3.70 ft (1.13 m) above land-surface datum. Prior to December 1969, top of instrument platform, 2.57 ft (0.78 m) above land-surface datum. REMARKS.--Observation well. Water levels affected by nearby pumpage. PERIOD OF RECORD.--May 1964 to December 1969, discontinued. March 1982 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 26.24 ft (8.00 m) below land-surface datum, Dec. 16, 1969; lowest water level measured, 74.31 ft (22.6 m) below land-surface datum, Mar. 29, 1965. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATIONS Water Water Date level Date level Dec. 10 38.16 Feb. 25 42.79 a Pumping. 346 347 GROUND-WATER LEVELS ST. CROIX, U.S. VIRGIN ISLANDS 174303064484400. Local number, 6. LOCATION.--Lat 17°43'03", long 64°48'44". Owner: U.S. Government, Virgin Islands Government Name: Adventure 28. AQUIFER.--Alluvium of Pleistocene age and marl of Oligocene age. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 4 in (0.10 m), cased 4 in (0.10 m). Depth 97 ft (29.6 m) DATUM.--Elevation of land-surface datum is about 80 ft (24.39 m) above mean sea level, from topographic map. Measuring point: Upper edge of hole at 4 in (0.10 m) casing, 2.00 ft (0.61 m) above land-surface datum. Prior June 20, 1983, top of 4 in (0.10 m) casing, 0.90 ft (0.27 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--August 1973 to March 1974, discontinued. March 1982 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 24.90 ft (7.59 m) below land-surface datum, Mar. 25, 1982; lowest water level recorded, 40.18 ft (12.25 m) below land-surface datum, Aug. 5, 1984. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 39.95 35.83 33.55 34.66 34.98 35.44 35.74 35.82 34.70 35.65 36.55 37.11 2 39.95 35.50 33.59 34.66 34.99 35.45 35.74 35.83 34.73 35.68 36.58 37.09 3 39.95 35.24 33.66 34.69 34.98 35.47 35.75 35.86 34.73 35.72 36.61 37.08 4 39.95 35.00 33.69 34.71 34.99 35.49 35.75 35.88 34.75 35.75 36.63 37.08 5 39.95 34.81 33.72 34.75 35.01 35.52 35.76 35.91 34.79 35.78 36.66 37.08 6 39.95 34.65 33.75 34.79 35.03 35.52 35.76 35.93 34.83 35.81 36.69 37.08 7 39.95 34.54 33.81 34.80 35.05 35.53 35.74 35.95 34.86 35.83 36.70 37.12 8 39.96 34.47 33.85 34.83 35.07 35.55 35.71 35.95 34.89 35.86 36.72 37.15 9 39.31 34.45 33.91 34.L6 35.09 35.57 35.69 35.95 34.93 35.89 36.75 37.18 10 38.95 34.47 33.95 34.82 35.11 35.58 35.67 35.96 34.98 35.93 36.78 37.20 11 38.70 34.50 33.99 34.80 35.14 35.58 35.65 35.96 35.01 35.95 36.80 37.23 12 38.50 34.53 34.05 34.79 35.16 35.59 35.64 35.95 35.02 35.98 36.82 37.25 13 38.37 34.43 34.09 34.78 35.17 35.59 35.63 35.51 35.04 36.01 36.84 37.29 14 38.29 34.20 34.14 34.78 35.19 35.59 35.60 35.22 35.07 36.03 36.85 37.33 15 38.25 33.87 34.18 34.79 35.21 35.60 35.60 35.01 35.10 36.06 36.87 37.36 16 38.23 33.62 34.22 34.79 35.23 35.60 35.60 34.88 35.13 36.09 36.89 37.40 17 38.23 33.52 34.26 34.80 35.25 35.62 35.60 34.80 35.17 36.12 36.92 37.42 18 38.23 33.44 34.28 34.81 35.25 35.63 35.60 34.75 35.21 36.15 36.96 37.45 19 38.23 33.38 34.30 34.82 35.27 35.64 35.60 34.71 35.24 36.18 36.99 37.47 20 38.23 33.29 34.32 34.85 35.28 35.65 35.60 34.70 35.29 36.20 37.02 37.50 21 38.23 33.26 34.35 34.85 35.29 35.66 35.62 34.69 35.32 36.23 37.05 37.52 22 38.24 33.25 34.35 34.88 35.31 35.67 35.65 34.68 35.34 36.27 37.06 37.54 23 38.24 33.25 34.32 34.88 35.33 35.68 35.67 34.68 35.38 36.30 37.07 31.55 24 38.24 33.26 34.44 34.88 35.35 35.70 35.69 34.70 35.42 36.33 37.08 37.57 25 38.10 33.30 34.48 34.89 35.35 35.71 35.72 34.71 35.46 36.36 37.09 37.57 26 37.78 33.33 34.51 34.88 35.36 35.71 35.74 34.71 35.50 36.39 37.14 37.57 27 37.50 33.38 34.54 34.89 35.39 35.71 35.77 34.72 35.53 36.42 37.15 37.55 28 37.24 33.45 34.56 34.91 35.42 35.72 35.77 34.73 35.55 36.43 37.16 37.54 29 37.04 33.49 34.57 34.93 35.72 35.78 34.70 35.59 36.46 37.16 37.54 30 36.61 33.52 34.60 34.93 35.73 35.80 34.70 35.63 36.49 37.16 37.54 31 36.26 34.63 34.96 35.73 34.71 36.52 37.15 LOW 39.96 35.83 34.63 34.96 35.42 35.73 35.80 35.96 35.63 36.52 37.16 37.57 HIGH 36.26 33.25 33.55 34.66 34.98 35.44 35.60 34.68 34.70 35.65 36.55 37.08 WTR YR 1986 MEAN 35.7 LOW 39.96 HIGH 33.25 26 30 34 38 42 ONDJFMAMJJ ASONDJ FM AM J J ASONDJFMAMjJ AS 1983 1984 1985 1986 GROUND-WATER LEVELS ST. CROIX, U.S. VIRGIN ISLANDS 174525064460600. Local number, 7. LOCATION.--Lat 17°45'25", long 64°46'06". Owner: Virgin Islands Government. Name: Concordia 14. AQUIFER.--Sand and gravel. WELL CHARACTERISTICS.--Drilled production water-table well, diameter 6 in (0.15 m), cased 6 in (0.15 m). Depth 85 ft (25.91 m). DATUM.--Elevation of land-surface datum is about 40 ft (12.2 m) above mean sea level, from topographic map. Measuring point: Top of 0.50 in (0.01 m) pipe on top of pump concrete base, 2.30 ft (0.70 m) above land-surface datum. REMARKS.--Observation well. Water levels affected by pumpage. PERIOD OF RECORD.--March 1982 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 15.56 ft (4.74 m) below land-surface datum, Nov. 13, 1984; lowest water level measured, 41.75 ft (12.73 m) below land-surface datum, Feb. 24, 1983. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Dec. 10 18.05 Feb. 24 21.05 Apr. 29 23.15 June 30 22.01 174527064460100. Local number, 8. LOCATION.--Lat 17°45'27", long 64°46'01" Owner: Virgin Islands Government. Name: Concordia 1 (Main pump house). AQUIFER.--Limestone of Tertiary Age. WELL CHARACTERISTICS.--Drilled production water-table well, diameter 6 in (0.15 m), cased 6 in (0.15 m). Depth 82 ft (25.0 m). DATUM.--Elevation of land-surface datum is about 40 ft (12.2 m) above mean sea level, from topographic map. Measuring point: Top of 6 in (0.15 m) casing, 2.20 ft (0.67 m) above land-surface datum. REMARKS.--Observation well. Water levels affected by pumpage. PERIOD OF RECORD.--March 1982 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 16.68 ft (5.08 m) below land-surface datum, Nov. 13, 1984; lowest water level measured, a28.39 ft (a8.66 m) below land-surface datum, Dec. 8, 1982. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Dec. 10 19.17 Feb. 24 21.60 Apr. 29 23.17 June 30 22.30 a Pumping. 348 GROUND-WATER LEVELS ST. CROIX, U.S. VIRGIN ISLANDS 174532064460300. Local number, 9. LOCATION.--Lat 17°45'32", long 64°46'03". Owner: Virgin Islands Government. Name: Concordia 7. AQUIFER.--Limestone of Tertiary Age. WELL CHARACTERISTICS.--Drilled production water-table well, diameter 6 in (0.15 m), cased 0-81 ft (0-24.7 m). Depth 81 ft (24.7 m). DATUM.--Elevation of land-surface datum is 35 ft (10.7 m) above mean sea level, from topographic map. Measuring point: Hole in pump base, 2.20 ft (0.67 m) above land-surface datum. Previous to Mar. 25, 1982, hole in pump base 2.50 ft (0.76 m) above land-surface datum. REMARKS.--Observation well. Water levels affected by pumping. PERIOD OF RECORD.--June 1962 to October 1968, discontinued. March 1982 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 1.75 ft (0.53 m) below land-surface datum, May 11, 1966; lowest water level measured, 57.40 ft (17.5 m) below land-surface datum, Mar. 5, 1964. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Dec. 10 a21.59 Feb. 24 8.01 Apr. 29 9.43 June 30 8.70 174329064454700. Local number, 10. LOCATION.--Lat 17°43'29", long 64°45'47". Owner: Virgin Islands Government. Name: Barren Spot 5 (PWD-5). AQUIFER.--Alluvium and marl. WELL CHARACTERISTICS.--Drilled produc,ion water-table well, diameter 6 in (0.15 m), cased 0-130 ft (0-39.63 m), perforated 71-130 ft (21.64-39.53 m). Depth 130 ft (39.63 m). DATUM.--Elevation of land-surface datum is about 75 ft (22.86 m) above mean sea level, from topographic map. Measuring point: Hole on top of pump base, 2.00 ft (0.61 m) above land-surface datum. REMARKS.--Observation well. Water levels affected by pumping. PERIOD OF RECORD.--March 1982 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 61.86 ft (18.86 m) below land-surface datum, Mar. 26, 1982; lowest water level measured, a75.52 ft (a23.02 m) below land-surface datum, Sept. 8, 1982. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Dec. 10 a69.46 Feb. 24 65.13 Apr. 29 64.86 June 30 64.14 a Pumping. 349 I I GROUND-WATER LEVELS ST. THOMAS, U.S. VIRGIN ISLANDS 182050064580400. Local number, 1. LOCATION.--Lat 18°20'50", long 64°58'04". Owner: U.S. Government, Virgin Islands Government. Name: USGS-8 (Family well - Thatch Farm). AQUIFER.--Volcanic rocks of Cretaceous age. WELL CHARACTERISTICS.--Drilled water-table production well, diameter 6 in (0.15 a), cased 6 in (0.15 m) 0-25 ft (0-7.62 m), open hole 25-80 ft (7.62-24.4 m). Depth 80 ft (24.4 ). DATUM.--Elevation of land-surface datum is 80 ft (24.4 m) above mean sea level, from topographic map. Measuring point: Top of 6 in (0.15 m) casing, 2.50 ft (0.76 m) above land-surface datum. Prior to Mar. 23, 1982, top of 6 in (0.15 m) casing, 1.30 ft (0.40 m) above land-surface datum. REMARKS.--Non-potable public-water supply and observation well. PERIOD OF RECORD.--October 1963 to August 1969, discontinued. March 1982 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 2.33 ft (0.71 ) below land-surface datum, Nov. 20, 1984; lowest water level measured, 56.44 ft (17.21 m) below land-surface datum, Aug. 24, 1984. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Dec. 11 a7.52 Feb. 26 a24.72 Apr. 30 a38.10 July 1 a30.79 182138064543100. Local number, 2. LOCATION.--Lat 18°21'38", long 64°54'31". Owner: Mahogany Run Resort. Name: Mahogany 15. AQUIFER.--Fractured rocks. WELL CHARACTERISTICS.--Drilled public supply water-table well, diameter 6 in (0.15 m), cased 6 in (0.15 m). Depth 145 ft (44.21 m). DATUM.--Elevation of land-surface datum is 120 ft (36.6 m) above mean sea level, from topographic map. Measuring point: Top of 6 in (0.15 m) casing, 1.20 ft (0.36 m) below land-surface datum. REMARKS.--Observation well. Water levels affected by nearby pumping well. PERIOD OF RECORD.--March 1982 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 12.45 ft (3.79 m) below land-surface datum, July 1986; lowest water level measured, 88.62 ft (27.01 m) below land-surface datum, Oct. 4, 1984. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Dec. 11 a14.64 Feb. 26 26.52 Apr. 30 35.50 July 1 12.45 182138064542500. Local number, 3. LOCATION.--Lat 18°21'38", long 64°54'25". Owner: Mahogany Run Resort. Name: Mahogany 16. AQUIFER.--Fractured rocks. WELL CHARACTERISTICS.--Drilled water-table production well, diameter 6 in (0.15 m), cased 6 in (0.15 m). Depth 145 ft (44.21 m). DATUM.--Elevation of land-surface datum is 130 ft (39.6 m) above mean sea level, from topographic map. Measuring point: Top of 6 in (0.15 m) casing, 1.30 ft (0.40 m) below land-surface datum. REMARKS.--Water levels affected by nearby pumping well. PERIOD OF RECORD.--March 1982 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 17.52 ft (5.34 m) below land-surface datum, July 1, 1986; lowest water level measured, a103.85 ft (31.65 m) below land-surface datum, Oct. 4, 1984. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Dec. 11 17.74 Feb. 26 47.02 Apr. 30 39.62 July 1 17.52 a Pumping. 350 GROUND-WATER LEVELS ST. THOMAS, U.S. VIRGIN ISLANDS 182136064541900. Local number, 4. LOCATION.--Lat 18°21'3.6", long 64°54'19". Owner: Mahogany Run Resort Name: Mahogany 17. AQUIFER.--Fractured rock. WELL CHARACTERISTICS.--Drilled water-table production well, diameter 6 in (0.15 m), cased 6 in (0.15 m). Depth 145 ft (44.21 m). DATUM.--Elevation of land-surface datum is 140 ft (42.7 m) above mean sea level, from topographic map. Measuring point: Top of 6 in (0.15 m) casing at land-surface datum. REMARKS.--Public water supply. Water levels affected by nearby pumping well. PERIOD OF RECORD.--March 1982 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 17.49 ft (5.33 m) below land-surface datum, Dec. 11 1985; lowest water level measured, a60.40 ft (18.41 m) below land-surface datum, Sept. 10, 1982. Date Dec. 11 WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATIONS Water Water Water Water level Date level Date level Date level 17.49 Feb. 26 33.38 Apr. 30 37.55 July 1 18.62 182029064535200. Local number, 5. LOCATION.--Lat 18°20'29", long 64°53'52". Owner: Virgin Islands Government, V.I. Housing Authority. Name: Donoe 3. AQUIFER.--Volcanic rock undifferentiated. Fracture at 165 ft (50.3 m), from drilling log. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 6 in (0.15 m), cased 0-20 ft (0-6.10 m), open hole 20-400 ft (6.10-122 m). Depth 400 ft (122 m). DATUM.--Elevation of land-surface datum is about 235 ft (71.6 m) above mean sea level, from topographic map. Measuring point: Top of 6 in (0.15 m) casing, 2.30 ft (0.70 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--March 1982 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 54.24 ft (16.53 m) below land-surface datum, Nov. 20, 1984; lowest water level measured, 90.98ft (27.73m) below land-surface datum, Apr. 30, 1986. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level' Date level Date level Date level Dec. 11 64.69 Feb. 26 76.36 Apr. 30 90.98 July 1 66.18 a Pumping. 351 352 GROUND-WATER LEVELS ST. THOMAS, U.S. VIRGIN ISLANDS 182038064550300. Local number, 6. LOCATION.--Lat 18°20'38", long 64°55'03". Owner: U.S. Government, Virgin Islands Government. Name: Grade School 3. AQUIFER.--Volcanic breccia. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 6 in (0.15 m), ca,ed 6 in (0.15 m). Depth 70 ft (21.3 m). DATUM.--Elevation of land-surface datum is about 60 ft (18.3 m) above mean sea level, from topographic map. Measuring point: Top of 0.5 in (0.01 m) hole at 6 in (0.15 m) casing, 1.30 ft 0.40 m) ajove land-surface datum. Prior to June 27, 1983, top of 6 in (0.15 m) casing, 2.90 ft (0.88 a) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--March 1982 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 3.72 ft (1.13 m) below land-surface datum, May 22, 1986; lowest water level recorded, 35.38 ft (10.79 a) below land-surface datum, July 21, 1982. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1995 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 22.55 13.65 13.81 19.95 22.42 23.87 24.65 17.05 4.65 9.41 13.95 17.15 2 22.61 13.27 14.10 20.01 22.48 23.90 24.67 15.79 4.79 9.62 13.96 17.27 3 22.56 13.24 14.39 20.08 22.54 23.93 24.70 14.59 4.87 9.82 14.01 17.28 4 22.53 13.42 14.70 20.16 22.60 23.97 24.73 13.08 5,00 10.02 14.08 17.29 5 22.53 13.68 15.01 20.22 22.68 24.02 24.72 12.23 5.15 10.16 14.15 17.33 6 21.16 13.58 15.28 20.27 22.77 24.07 24.60 11.87 5.32 10.37 14.23 17.37 7 17.33 13.32 15.57 20.33 22.87 24.13 24.46 11.84 5.45 10.54 14.33 17.40 8 15.42 13.23 15.84 20.47 22.99 24.16 24.35 10.92 5.58 10.74 14.51 17.44 9 14.53 13.39 16.12 20.69 23.10 24.19 24.30 10.11 5.71 10.94 14.69 17.53 10 14.15 13.67 16.36 20.77 23.20 24.20 24.28 9.97 5.84 11.14 14.87 17.62 11 14.25 13.99 16.58 20.82 23.24 24.23 24.29 9.31 5.96 11.33 15.04 17.72 12 14.81 14.33 16.78 20.90 23.29 24.25 24.31 8.16 6.09 11.53 15.21 17.84 13 15.51 14.35 16.95 20.97 23.32 24.28 24.32 7.91 6.20 11.73 15.38 17.97 14 16.16 14.03 17.12 21.04 23.35 24.34 24.35 7.10 6.29 11.93 15.44 18.08 15 16.82 13.78 17.29 21.12 23.38 24.39 24.39 6.30 6.42 12.15 15.50 18.18 16 17.43 13.20 17.44 21.21 23.41 24.39 24.44 6.11 6.52 12.36 15.58 18.43 17 18.00 12.26 17.61 21.28 23.44 24.39 24.48 6.12 6.64 12.56 15.70 18.67 18 18.52 11.49 17.77 21.37 23.44 24.40 24.51 5.94 6.73 12.75 15.82 18.96 19 19.00 11.12 17.97 21.43 23.44 24.41 24.54 4.46 6.82 12.92 15.96 19.23 20 19.33 11.04 18.24 21.49 23.44 24.45 24.64 4.20 6.90 13.12 16.12 19.49 21 19.60 11.15 18.47 21.55 23.46 24.50 24.82 4.11 7.14 13.32 16.25 19.73 22 19.86 11.34 18.61 21.60 23.47 24.52 24.93 3.84 7.43 13.54 16.39 19.94 23 20.10 11.58 18.78 21.66 23.52 24.55 25.06 3.78 7.67 13.75 16.51 20.12 24 20.32 11.85 18.93 21.71 23.59 24.57 25.19 3.86 7.89 13.92 16.63 20.31 25 19.86 12.16 19.10 21.75 23.68 24.59 25.26 3.94 8.08 14.0E 16.74 20.48 26 18.97 12.47 19.25 21.79 23.76 24.61 25.28 4.05 8.28 14.23 16.81 20.64 27 18.41 12.73 19.40 21.82 23.81 24.62 25.29 4.20 8.52 14.30 16.86 20.77 28 17.84 13.00 19.52 21.85 23.84 24.64 25.30 4.34 8./5 14.28 16.93 20.89 29 17.01 13.25 19.64 21.93 24.64 22.93 4.43 8.98 14.21 16.99 21.00 30 15.84 13.52 19.74 22.17 24.64 18.42 4.57 9.17 14.12 16.93 21.10 31 14.49 19.85 22.32 24.65 4.69 14.01 17.00 LOW 22.61 14.35 19.85 22.32 23.84 24.65 25.30 17.05 9.17 14.30 17.00 21.10 HIGH 14.15 11.04 13.81 19.95 22.42 23.87 18.42 3.78 4.65 9.41 13.95 17.15 WTR YR 1986 MEAN 16.8 LOW 25.30 HIGH 3.78 to 20 A\ arZ 29 ONDJ FMAMJ J ASONDJ FMAMJ J ASONDJ FMAMJ J AS 1983 1984 1985 1986 GROUND-WATER LEVELS ST. JOHN, U.S. VIRGIN ISLANDS 182010064472600. Local number, 1. LOCATION.--Lat 18°20'10", long 64°47'26". Owner: U.S. Government, National Park Services. Name: NPS-2 (Cruz Bay). AQUIFER.--Volcanic rocks of Cretaceous Age. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 6 in (0.15 m), 4 in (0.10 m) cased, 0-20 ft (0-6.10 m), open hole 20-99 ft (6.10-30.2 m). Depth 99 ft (30.2 m). DATUM.--Elevation of land-surface datum is 60 ft (18.3 m) above mean sea level, from topographic map. Measuring point: Top of 4 in (0.10 m) casing, 4.10 ft (1.25 m) above old land-surface datum after 1.40 ft (0.43 m) land fill and 2.70 ft (0.82 m) casing extension occurred. Prior to June 29, 1983, top of 4 in (0.10 m) casing, 1.40 ft (0.43 m) above land-surface datum. REMARKS.--Observation well. Water levels affected by pumping nearby well. PERIOD OF RECORD.--May 1964, discontinued. June 30, 1983 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, +1.41ft (0.43 m) below land-surface datum, May 1, 1986; lowest water level measured, 42.56 ft (12.98 m) below land-surface datum, Aug. 30, 1967. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Dec. 12 22.93 Feb. 27 33.17 May 1 +1.41 July 2 8.46 182109064460300. Local number, 2. LOCATION.--Lat 18°21'09", long 64°46'03". Owner: U.S. Government, National Park Service. Name: NPS-5 (Trunk Bay). AQUIFER.--Volcanic rocks of CretaceoL: Age. WELL CHARACTERISTICS.--Drilled water-table production well, diameter 6 in (0.15 m), cased 0-12 ft (0-3.66 m), open hole 12-60 ft (3.66-18.3 m). Depth 60 ft (18.3 m). DATUM.--Elevation of land-surface datum is 60 ft (18.3 m) above mean sea level, from topographic map. Measuring point: Top of 6 in (0.15 m) casing, 0.70 ft (0.21 m) above land-surface datum. Prior to Mar. 24, 1982 top of 6 in (0.15 m) casing, 1.00 ft (0.30 m) above land-surface datum. REMARKS.--Active water supply well for recreation facilities at Trunk Bay. PERIOD OF RECORD.--August 1964 to December 1969, discontinued. March 1982 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 12.83 ft (3.91 m) below land-surface datum, Jan. 24, 1985; lowest water level measured, a57.29 ft (17.47 m) below land-surface datum, Nov. 27, 1968. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Dec. 12 25.39. Feb. 27 a47.44 May 1 35.50 July 2 14.80 a Pumping. + Above land-surface datum. 353 ••• 354 GROUND-WATER LEVELS ST. JOHN, U.S. VIRGIN ISLANDS 182116064451000. Local number, 3. LOCATION.--Lat 18'21'16", long 64°45'10". Owner: U.S. Government, National Park Service. Name: NPS-6 (Cinnamon Bay). AQUIFER.--Volcanic rocks of Cretaceous Age. WELL CHARACTERISTICS.--Drilled water-table production well, diameter 6-in (0.15 m), cased 0-51 ft (0-15.55 m), open hole 51-70 ft (15.55-21.34 m). Depth 70 ft (21.34 m). DATUM.--Elevation of land-surface datum is about 60 ft (18.3 m) above mean sea level, from topographic map. Measuring point: Hole on 6 in (0.15 m) casing, 2.00 ft (0.61 m) above land-surface datum. Prior to June 29, 1983, top of 6 in (0.15 m) casing at land-surface datum. REMARKS.--Abandoned as production well. Recording observation well. PERIOD OF RECORD.--August 1964 to December 1969, discontinued. March 1982 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 41.12 ft (12.54 m) below land-surface datum, Aug. 15, 1969; lowest water level recorded, 63.15 ft (19.25 m) below land-surface datum, July 1, 1968. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 57.40 56.55 54.33 56.48 57.21 57.34 56.68 49.54 55.14 56.26 56.10 2 57.41 56.42 54.45 56.50 57.21 57.36 56.45 49.80 55.23 56.30 56.08 3 57.43 56.32 54.61 56.52 57.21 57.39 56.27 49.99 55.29 56.34 56.08 4 57.45 56.25 54.75 56.54 57.24 57.40 56.06 50.10 55.35 56.37 56.08 5 57.47 56.15 54.88 56.56 57.24 57.40 55.83 50.27 55.42 56.40 56.08 6 57.47 56.11 54.99 56.60 57.23 57.40 55.64 50.53 55.50 56.42 56.08 7 57.34 56.07 55.08 56.63 57.24 57.39 55.47 50.79 55.55 56.43 56.08 8 57.26 56.05 55.17 56.67 57.26 57.38 55.25 51.06 55.60 56.43 56.10 9 57.19 56.03 55.24 56.69 57.27 57.35 54.97 51.32 55.65 56.45 56.13 10 57.15 56.03 55.30 56.70 57.27 57.32 54.67 51.58 55.72 56.46 56.17 11 57.14 56.02 55.34 56.69 57.28 57.31 54.42 51.85 55.78 56.46 56.21 12 57.13 56.05 55.41 56.67 57.28 57.31 53.93 52.11 55.84 56.43 56.24 13 57.10 56.06 55.48 56.66 57.29 57.31 53.41 52.37 55.87 56.42 56.25 14 57.07 55.89 55.56 56.66 57.31 57.30 52.81 52.64 55.91 56.39 56.25 15 57.06 55.57 55.61 56.67 57.33 57.30 52.09 52.90 55.93 56.35 56.25 16 57.06 55.03 55.66 56.68 57.39 57.31 51.56 53.15 55.95 56.32 56.28 17 57.06 54.36 55.73 56.69 57.42 57.33 51.29 53.37 55.97 56.31 56.30 18 57.05 53.72 55.80 56.71 57.47 57.33 51.19 53.55 56.00 56.31 56.32 19 57.04 53.25 55.86 56.71 57.51 57.33 50.00 53.73 56.03 56.31 56.35 20 57.04 53.04 55.92 56.71 57.55 57.33 48.90 53.89 56.06 56.33 56.36 21 57.03 52.99 56.00 56.75 57.57 57.32 48.30 54.04 56.08 56.36 56.36 22 57.03 53.03 56.05 56.80 57.58 57.29 47.60 54.21 56.11 56.38 56.36 23 57.03 53.11 56.09 56.83 57.56 57.24 46.49 54.34 56.13 56.35 56.35 24 57.03 53.22 56.13 56.86 57.53 57.21 45.76 54.46 56.14 56.31 56.37 25 57.03 53.37 56.19 56.86 57.48 57.19 45.66 54.59 56.14 56.26 56.40 26 57.01 53.52 56.26 56.89 57.40 57.19 46.12 54.69 56.14 56.21 56.41 27 57.00 53.71 56.31 56.91 --- 57.35 57.22 46.83 54.79 56.15 56.18 56.41 28 56.98 53.84 56.38 --- 57.22 57.33 57.21 47.49 54.89 56.17 56.18 56.42 29 56.96 54.01 56.42 --- 57.31 57.14 48.05 54.98 56.20 56.17 56.43 30 56.93 54.16 56.44 57.31 57.01 48.70 55.05 56.23 56.15 56.44 31 56.74 --- 56.45 57.33 --- 49.13 --- 56.24 56.12 --- LOW 57.47 56.55 56.45 57.58 57.40 56.68 55.05 56.24 56.46 56.44 HIGH 56.74 52.99 54.33 57.21 57.01 45.66 49.54 55.14 56.12 56.08 44 toip 47 0- 4C Lac.).1 50 z .113 53 Lae) 56 fez 59 ON0.1 FMAMJJ ASONDJ FMAIAJJ ASONDJ FMAMJJ AS 1983 1984 1985 1986 355 GROUND-WATER LEVELS ST. JOHN, U.S. VIRGIN ISLANDS 182042066454500. Local number, 5. LOCATION.--Lat 18°20'42", long 66°45'45". Owner: Virgin Islands Government. Name: DPW-6. (Sussanaberg) AQUIFER.--Louisenhoj Formation. WELL CHARACTERISTICS.--Drilled water-table well, diameter 6 in (0.15 m), cased 6 in (0.15 m). Sounded depth 70 ft (21.3 m). DATUM.--Elevation of land-surface datum is about 640 ft (195 m) above mean sea level, from topographic map. Measuring point: Top of 6 in (0.15 m) casing, 1.60 ft (0 49 m) above land-surface datum. Prior to June 28, 1983, top of 6 in (0.15 m) casing, 1.30 ft (0.40 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--September 1982 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 1.33 ft (0.40 m) below land-surface datum, May 18, 1986; lowest water level recorded, 22.18 ft (6.94 m) below land-surface datum, Oct. 5, 1985. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 22.72 8.83 6.42 10.42 13.70 16.63 18.54 15.82 2.38 5.22 9.09 11.79 2 22.73 8.83 6.54 10.53 13.81 16.69 18.60 15.89 2.73 5.29 9.17 11.87 3 22.75 8.83 6.68 10.63 13.91 16.77 18.64 11.93 2.79 5.33 9.30 11.98 4 22.77 11.72 6.85 10.74 14.02 16.84 18.69 12.58 2.88 5.51 9.42 12.06 5 22.78 11.89 7.01 10.85 14.13 16.92 18.72 13.08 2.97 5.60 9.56 12.15 6 18.80 11.96 7.17 10.95 14.23 16.99 18.76 13.18 3.05 5.71 9.71 12.25 7 17.39 12.03 7.40 11.06 14.34 17.05 18.82 10.48 3.14 5.83 9.79 12.34 8 20.63 12.10 7.60 11.16 14.44 17.14 18.87 7.49 3.23 5.99 9.96 12.44 9 21.06 12.21 7.76 1 1.27 14.55 17.23 18.91 6.02 3.31 6.15 10.09 12.55 10 20.96 12.28 7.89 11.37 14.66 17.29 18.95 8.55 3.40 6.29 10.23 12.65 11 20.78 12.41 8.05 11.48 14.76 17.36 19.00 3.85 3.49 6.37 10.25 12.73 12 20.59 12.60 8.20 11.59 14.87 17.42 19.05 3.68 3.58 6.53 10.37 12.82 13 20.39 7.41 8.29 11.69 14.97 17.47 19.08 3.28 3.66 6.70 10.42 12.96 14 20.19 5.38 8.45 11.80 15.08 17.54 19.11 2.78 3.75 6.83 10.45 13.06 15 20.05 3.88 8.57 11.90 15.18 17.60 19.14 2.93 3.84 6.92 10.51 13.17 16 19.94 3.05 8.76 12.01 15.29 17.66 19.19 4.14 3.92 7.03 10.60 13.29 17 19.85 3.17 8.82 12.12 15.40 17.71 19.21 5.02 4.01 7.18 10.70 13.38 18 19.76 4.31 8.93 12.22 15.50 17.77 19.27 1.89 4.10 7.36 10.81 13.52 19 19.50 5.41 9.05 12.33 15.61 17.84 19.31 2.10 4.18 7.47 10.92 13.64 20 19.16 5.77 9.15 12.43 15.71 17.90 19.35 2.69 4.27 7.61 11.03 13.76 21 18.99 4.07 9.26 12.54 15.82 17.94 19.38 2.03 4.36 7.78 11.13 13.86 22 18.97 5.18 9.36 12.64 15.93 18.02 19.46 2.15 4.44 8.00 11.24 13.94 23 19.02 5.5C 9.47 12.75 16.03 18.09 19.51 2.69 4.53 8.05 11.32 14.07 24 19.08 5.73 9.58 12.86 16.14 18.14 19.55 2.77 4.62 8.10 11.41 14.15 25 19.10 5.88 9.68 12.96 16.24 18.20 19.60 2.78 4.71 8.22 11.55 14.26 26 18.93 5.98 9.79 13.07 16.35 18.24 19.65 2.78 4.79 8.38 11.66 14.29 27 14.09 6.10 9.89 13.17 16.46 18.29 19.69 2.78 4.88 8.51 11.77 14.35 28 15.28 6.22 10.0 13.28 16.56 18.34 19.71 2.78 4.97 8.67 11.83 14.43 29 14.04 6.32 10.10 13.39 18.39 19.36 2.76 5.05 8.78 11.85 14.54 30 7.38 6.39 10.21 13.49 18.45 13.69 2.69 5.14 8.80 11.79 14.63 31 7.43 10.32 13.60 18.50 2.78 8.95 11.77 LOW 22.78 12.60 10.32 13.60 16.56 18.50 19.71 15.89 5.14 8.95 11.85 14.63 HIGH 7.38 3.05 6.42 10.42 13.70 16.63 13.69 1.89 2.38 5.22 9.09 11.79 WTR YR 1986 MEAN 11.6 LOW 22.78 HIGH 1.89 0 coa 5 4t wo 10 (3 Z4 15 20 Wi 25 it ONDJFMAMJJ ASONDJFMAMJj ASONDJFMAMJJ AS 1983 1984 1985 1986 I 356 GROUND-WATER LEVELS ST. JOHN, U.S. VIRGIN ISLANDS 182044064454600. Local number, 6. LOCATION.--Lat 18°20'44", long 64°45'46". Owner: Virgin Islands Government. Name: DPW-5 AQUIFER.--Louisenhoj Formation. WELL CHARACTERISTICS.--Drilled public supply water-table well, diameter 6 in (0.15 m), cased 6 in (0.15 m). Sounded depth 145 ft (44.2 m). DATUM.--Elevation of land-surface datum is about 640 ft (195 m) above mean sea level, from topographic map. Measuring point: Top of 6 in (0.15 m) casing, 1.40 ft (0.43 m) above land-surface dattm. REMARKS.--Observation well. Water levels affected by pumping. PERIOD OF RECORD.--September 1982 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 18.85ft (5.74m) below land-surface datum, July 2, 1986; lowest water level measured, al07.4 ft (32.7 m) below land-surface datum, Sept. 19, 1985. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Dec. 12 71.20 Feb. 27 44.26 May 1 48.98 July 2 18.85 182044064454800. Local number, 7. LOCATION.--Lat 18°20'44, long 64°45'48". Owner: Virgin Islands Government. Name: DPW-4 AQUIFER.--Louisenhoj Formation. WELL CHARACTERISTICS.--Drilled public supply water-table well, diameter 6 in (0.15 m), cased 6 in (0.15 m). Sounded depth 60 ft (18.3 m). DATUM.--Elevation of land-surface datum is about 640 ft (195 m) above mean sea level, from topographic map. Measuring point: Top of 6 in (0.15 m) casing, 0.60 ft (0.18 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--September 1982 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 14.48 ft (4.41 m) below land-surface datum, July 2, 1986; lowest water level measured, 49.10 ft (14.97 m) below land-surface datum, Oct. 26, 1982. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATIONS Water Date level Date level Date level Date level Water Water Water Dec. 12 48.33 Feb. 27 46.19 May 1 38.23 July 2 14.48 182044064454900. Local number, 8. LOCATION.--Lat 18°20'44", long 64°45'49". Owner: Virgin Islands Government. Name: DPW-3. AQUIFER.--Louisenhoj Formation. WELL CHARACTERISTICS.--Drilled public supply water-table well, diameter 6 in (0.15 m), cased 6 in (0.15 ). Sounded depth 110 ft (33.5 m). DATUM.--Elevation of land-surface datum is about 640 ft (195 m) above mean sea level, from topographic mpa. Measuring point: Top of 6 in (0.15 m) casing, 1.80 ft (0.55 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--September 1982 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 12.17ft (3.71 m) below land-surface datum, July 2, 1986; lowest water level measured, 69.58 ft (21.21 m) below land-surface datum, Feb. 27, 1986. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Dec. 12 66.74 Feb. 27 69.58 May 1 33.22 July 2 12.17 a Pumping. GROUND-WATER LEVELS ST. JOHN, U.S. VIRGIN ISLANDS 182044064455000. Local number, 9. LOCATION.--Lat 18°20'44", long 64°45'50". Owner: Virgin Islands Government. Name: DPW-2. AQUIFER.--Louisenhoj Formation. WELL CHARACTERISTICS.--Drilled public supply water-table well, diameter 6 in (0.15 m), cased 6 in (0.15 m). Sounded depth 65 ft (19.8 m). DATUM.--Elevation of land-surface datum is about 640 ft (195 m) above mean sea level, from topographic map. Measuring point: Top of 6 in (0.15 m) casing, 2.00 ft (0.61 m) above land-surface datum. REMARKS.--Observation well. PERIOD OF RECORD.--September 1982 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 17.10 ft (5.21 m) below land-surface datum, July 2, 1986; lowest water level measured, 52.44 ft (15.99 m) below land-surface datum, May 19, 1983. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Dec. 12 51.25 Feb. 27 51.49 May 1 43.09 July 2 17.10 182044064455200. Local number, 10. LOCATION.--Lat 18°20'44", long 64°45'52". Owner: Virgin Islands Government. Name: DPW-1. AQUIFER.--Louisenhoj Formation. WELL CHARACTERISTICS.--Drilled public supply water-table well, diameter 6 in (0.15 m), cased 6 in (0.15 m). Sounded depth 60 ft (18.3 m). DATUM.--Elevation of land-surface datum about 640 ft (195 m) above mean sea level. Measuring point: Top of 6 in (0.15 m) casing, 2.00 ft (0.61 m) above land-surface datum. REMARKS.--Observation well. Water levels affected by pumping. PERIOD OF RECORD.--September 1982 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 16.60 ft (5.06 m) below land-surface datum, July 2, 1986; lowest water level measured, 38.92 ft (11.86 m) below land-surface datum, Feb. 27, 1986 WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATIONS Water Water Water Water Date level Date level Date level Date level Dec. 12 a38.54 Feb. 27 38.92 May 1 38.65 July 1 16.60 357 358 GROUND-WATER LEVELS ST. JOHN, U.S. VIRGIN ISLANDS 181956064464500. Local number, 11. LOCATION.--Lat 18°19'56", long 64°46'45". Owner: Virgin Islands Government. Name: Guinea Gut Well. AQUIFER.--Louisenhoj Formation (Donnelly, 1959). WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 6 in (0.15 m), casad 6 in (0.15 m). Depth 85 ft (25.9 m). DATUM.--Elevation of land-surface datum is about 280 ft (85.36 m) above mean sea level, from topographic map. Measuring point: Bottom of 0.5 in (0.01 m) hole at 6 in (0.15 m) casing, 1.50 ft (0.46 m) above land-surface datum. Prior to June 28, 1983, top of 6 in (0.15 m) casing, 1.80 ft (0.55 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--March 1982 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 3.05 ft (0.93 m) below land-surface datum, June 13, 1986; lowest water level recorded, 25.25 ft (7.70 m) below land-surface,datum, Oct. 2, 1985. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 25.21 8.00 8.35 11.48 15.67 19.43 22.20 14.32 3.28 3.83 5.19 7.40 2 25.24 7.56 8.45 11.57 15.81 19.54 22.28 12.94 3.22 3.88 5.36 7.46 3 25.24 7.65 8.54 11.65 15.92 19.66 22.35 11.19 3.22 3.86 5.53 7.58 4 25.24 7.74 8.64 11.75 16.09 19.77 22.42 9.69 3.21 3.95 5.70 7.72 5 25.24 7.84 8.73 11.87 16.23 19.87 22.47 9.00 3.21 3.97 5.90 7.83 6 25.07 7.93 8.85 11.99 16.41 19.97 22.52 8.48 3.19 4.00 6.15 7.99 7 19.65 8.02 8.98 12.14 16.57 20.07 22.59 7.51 3.17 4.02 6.34 8.09 8 16.84 8.10 9.08 12.27 16.73 20.18 22.66 6.94 3.15 4.11 6.55 8.22 9 15.98 8.08 9.17 12.41 16.87 20.28 22.70 6.61 3.14 4.17 6.74 8.38 10 16.52 8.17 9.26 12.41 17.04 20.38 22.74 6.43 3.12 4.24 6.84 8.53 11 16.91 8.26 9.35 12.48 17.20 20.47 22.80 5.43 3.11 4.28 6.83 8.61 12 17.27 8.32 9.40 12.62 17.36 20.58 22.87 5.31 3.12 4.33 6.73 8.69 13 17.61 8.41 9.56 12.75 17.50 20.68 22.93 5.01 3.10 4.42 6.77 8.80 14 17.88 8.50 9.73 12.90 17.65 20.76 22.99 4.50 3.11 4.48 6.65 8.91 15 18.20 8.59 9.83 13.07 17.78 20.84 23.06 4.64 3.11 4.44 6.65 9.02 16 18.53 8.65 9.93 13.19 17.93 20.92 23.14 4.59 3.13 4.37 6.74 9.16 17 18.81 7.77 10.05 13.34 18.06 21.01 23.20 4.53 3.15 4.44 6.90 9.26 18 19.03 7.64 10.16 13.48 18.16 21.09 23.26 3.65 3.17 4.54 7.09 9.41 19 18.28 7.74 10.27 13.66 18.26 21.18 23.31 3.90 3.23 4.60 7.26 9.53 20 17.77 7.77 10.36 13.83 18.37 21.27 23.39 3.97 3.27 4.66 7.46 9.64 21 17.56 7.41 10.43 14.00 18.49 21.35 23.46 3.69 3.25 4.73 7.64 9.75 22 17.55 7.53 10.47 14.15 18.61 21.44 23.53 3.76 3.32 4.84 7.81 9.85 23 17.59 7.62 10.57 14.29 18.74 21.54 23.59 3.72 3.42 4.84 7.96 9.94 24 17.66 7.71 10.66 14.42 18.87 21.62 23.65 3.66 3.47 4.86 8.06 10.03 25 17.41 7.81 10.76 14.57 18.97 21.70 23.71 3.60 3.55 4.97 8.08 10.14 26 17.11 7.90 10.87 14.71 19.07 21.76 23.78 3.54 3.62 5.04 8.20 10.18 27 16.96 7.99 10.99 14.88 19.19 21.83 23.84 3.44 3.62 5.09 8.33 10.25 28 16.78 8.08 11.05 15.05 19.31 21.89 23.64 3.43 3.72 5.20 8.42 10.30 29 16.38 8.17 11.14 15.19 21.98 22.69 3.39 3.79 5.36 7.86 10.44 30 11.92 8.26 11.24 15.33 22.05 17.21 3.34 3.84 5.34 7.40 10.59 31 8.93 11.38 15.49 22.14 3.31 5.10 7.39 LOW 25.24 8.65 11.38 15.49 19.31 22.14 23.84 14.32 3.84 5.36 8.42 10.59 HIGH 8.93 7.41 8.35 11.48 15.67 19.43 17.21 3.31 3.10 3.83 5.19 7.40 WTR YR 1986 MEAN 11.7 LOW 25.24 HIGH 3.10 0 91 T araR 9 Z v9 18 e:31 etz W5 27 a 4c 0140.1 FMAMJJ ASONDJ F M Ald1J J ASOND J FIAAMjJ AS 1983 1984 1985 1986 INDEX 359 Page Page Access to WATSTORE data 31 Acre-foot, definition of 32 Adenosine triphosphate, definition of 32 Adjuntas, Lago Garzas No. 1 near dam near 296-299 Adjuntas, Rio Grande de Arecibo near 70-71 Aguada, Rio Culebrinas near 284-285 Aguas Buenas, Rio de Bayamon near 140-141 Algae growth potential, definition of 32 Analyses of samples collected at water-quality partial-record stations in Puerto Rico 293-299 Afiasco, Rio Grande de Afiasco near 277-278 Aquifer, definition of 32 Arecibo, Rio Grande de Arecibo above 78-79 Artesian, definition of 32 Artificial substrate, definition of 42 Ash mass, definition of 33 Bairoa near Caguas, Rio 171-172 Bacteria, definition of 32 Bahia de San Juan No. 5 at San Juan 151 Bayamon, at Flood Channel at Bayamon, Rio de 144-145 near Aguas Buenas 140-141 Bayamon basin, Rio de, ground-water records in 322 water-quality records in 140-145 Bayamon, Rio Guaynabo near 142-143 Bayaney, Rio Camuy near 64-65 Bed material, definition of 33 Bed load, definition of 41 Bed load discharge, definition of 41 Biochemical oxygen demand, definition of 33 Biomass, definition of 33 Blanca at El Jagual, Quebrada 158-159 Blanco basin, Rio, gaging station records in 211-212 Blasina near Carolina, Quebrada 154-155 Blue-green algae, definition of 39 Bonne Resolution Gut at Bonne Resolution, St. Thomas, VI 337 Boqueron, Laguna Cartagena near 250 BoquerOn, Laguna Cartagena outflow near 251-252 Borinquen, Rio Turabo at 164-165 Bottom material, definition of 33 Bucana basin, Rio, crest-stage partial records in 289 ground-water records in 330 water-quality records in 236-237 Bucana Floodway Channel at Highway 14 bridge near Ponce, Rio 289 Caguas, Lago Loiza No. 4 near mouth near 293-295 Caguas, Rio Bairoa near 171-172 Caguas, Rio Caguitas at Highway 30 at 169-172 Caguas, Rio Grande de Loiza at 166-168 CagUitas at Highway 30 at Caguas, Rio 169-170 Caimito near Juncos, Quebrada 173-174 Campo Rico, Rio Canovanas near 186-187 Camuy basin, Rio, gaging station records in 64-67 ground-water records in 305 Camuy near Bayaney, Rio 64-65 near Hatillo 66-67 Canal Principal de Diversiones at Lago de Guajataca 56-57 Canovanas near Campo Rico, Rio 186-187 Caonillas above Lago Caonillas near Jayuya, Rio 74-75 Carolina, Quebrada Blasina near 154-155 Catafio, Rio Hondo at Flood Channel near 138-139 Cayaguas at Cerro Gordo, Rio 162-163 Cayey, Lago Carite No. 1 near dam 296-299 Cayey, Lago Carite No. 3 on Rio de la Plata near 293-295 Cells/volume, definition of 33 Central Cambalache, Rio Grande de Arecibo at 90-91 Central Rufina, Rio Guayanilla at 244-245 Central San Vicente, Drainage Ditch at Rio Cibuco below 120-121 Central San Vicente, Rio Cibuco below 122-123 Cerrillos near Ponce, Rio 236-237 Cerro Gordo, Rio Cayaguas at 162-163 Charco Hondo, Rio Tanama at 88-89 Chemical oxygen demand, definition of 34 Chico at Providencia, Rio 222-223 Chico basin, Rio, water-quality records in 222-223 Chlorophyll, definition of 34 Ciales, Rio Cialitos at Highway 649 at 103-104 Ciales, Rio Grande de Manati at 99-100 Ciales, Rio Grande de Manati at Highway 149 at 101-102 Cialitos at Highway 649 at Ciales, Rio 103-104 Cibuco at Vega Baja, Rio 115-117 below Central San Vicente 122-123 below Corozal 112-114 Cibuco basin, gaging-station records in 112-115 ground-water records in 313-316 water-quality records in 113-123 Coamo basin, Rio, ground-water records in 328 water-quality records in 228-229 Coamo near Coamo, Rio 228-229 Color unit, definition of 34 Comerio, Rio de la Plata near 129-130 Contents, definition of 34 Control, definition of 34 Control structure, definition of 34 Cooperation 2 Corozal, Rio Cibuco below 112-114 Crest-stage station, definition of 34 Crest-stage partial-record stations, discharge at 289 Cubic foot per second, definition of 34 Cubic foot per second-day, definition of 34 Cubic feet per second per square mile, definition of 34 Culebrinas, at Highway 404 near Hoed, Rio 282-283 near Aguada 284-285 near San Sebastian 280-281 Culebrinas basin, Rio, gaging station records in 282 ground-water records in 332-333 water-quality records in 280-285 Damsite, Lago Loiza at 183 Definition of terms 32-45 Descalabrado basin, Rio, gaging stations records in 230 Descalabrado near Los Llanos, Rio 230 Diatoms, definition of 39 Discharge at crest-stage partial-record stations 289 Discharge at partial-record stations in Puerto Rico 289 Discharge, definition of 34 Dissolved, definition of 35 Dissolved-solids concentrations 35 Diversity index, definition of 35 Drainage area, definition of 35 Drainage basin, definition of 35 Drainage ditch at Rio Cibuco below Central San Vicente 120-121 below Warner Lambert Lab. near Sabana 118-119 Dry mass, definition of 33 El Verde, Quebrada Sonadora near 190-191 El Verde, Quebrada Toronja at 192-193 Espiritu Santo basin, Rio, gaging station records in 190-194 water-quality records in 195-196 Espiritu Santo near Rio Grande, Rio 194-196 Explanation of records 9-31 Fajardo basin, Rio, gaging station records in 201 water-quality records in 202-210 Fajardo below Fajardo, Rio 209-210 near Fajardo 201-208 Fecal coliform bacteria, definition of 33 Fecal streptococcal bacteria, definition of 33 Florida, Rio Grande de Arecibo below Lago Dos Bocas near Gage-height, definition of Gaging station, definition of Grande de Afiasco basin, Rio, gaging station records in 274 water-quality records in 272-278 Grande de Afiasco near Afiasco, Rio 277-278 near Lares 272-273 near Sari Sebastian 274-276 Grande de Arecibo at Central Cambalache, Rio 90-91 above Arecibo 78-79 below Lago Dos Bocas near Florida 76-77 near Adjuntas 70-71 near Utuado 72-73 Grande de Arecibo basin, Rio, gaging station records in 78-80 ground-water records in 306 water-quality partial-record stations, analyses of samples collected in 293-299 water-quality records in 70-91 76-77 35 35 360 INDEX Page Page Grande de Loiza at Caguas, Rio 166-168 at Quebrada Arenas 156-157 below Trujillo Alto 184-185 Grande de Loiza basin, Rio, gaging station records in 156-187 ground-water records in 325 water-quality partial-record stations, analyses of samples collected in 293-299 water-quality records in 154-185 Grande de Manati at Ciales, Rio 99-100 at Highway 2 near Manati 105-109 at Highway 149 at Ciales 101-102 near Morovis 96-98 Grande de Manati basin, Rio, gaging station records in 96-105 ground-water records in 307-312 water-quality records in 94-110 Grande de Patillas near Patillas, Rio 224-226 Grande de Patillas basin, Rio, gaging station records in 224 water-quality records in 225-226 Graphs: Ground-water levels at selected wells in Puerto Rico and the U.S. Virgin Islands 6 Monthly-mean discharge of selected streams in Puerto Rico 4 Green algae, definition of 39 Grid showing system for numbering wells and miscellaneous sites (latitude and longitude). 18 Ground-water level, records of 28-30 Ground-water quality, records of 30-31 Ground-water records for Puerto Rico 303-333 Ground-water records for U.S. Virgin Islands 343-358 Ground-water station, definition of 35 Ground-water stations in Puerto Rico, map showing location of 15 Ground-water stations in the U.S. Virgin Islands, map showing location of 17 Ground-water wells in U.S. Virgin Islands, map showing location of 17 Guadiana near Naranjito, Rio 131-132 Guajataca above Lago de Guajataca, Rio 54-55 above mouth near Quebradillas 60-62 at Lares 52-53 below Lago de Guajataca 58-59 Guajataca basin, Rio, gaging station records in 54-60 ground-water records in 303-304 water-quality partial-record stations, analyses of samples collected in 293-299 water-quality records in 52-62 Guanajibo near Hormigueros, Rio 265-267 near San German 254-255 Guanajibo basin, Rio, gaging station records in 256-265 ground-water records in 331 water-quality records in 254-267 Guanica, Rio Loco at 246-247 Guayanes above mouth at Playa de Guayanes, Rio 218-219 at Yabucoa 216-217 Guayanes basin, Rio, ground-water records in 327 water-quality records in 216-219 Guayanilla at Central Rufina, Rio 244-245 near Guayanilla 243 Guayanilla basin, Rio, gaging station records in 243 water-quality records in 244-245 Guaynabo near Bayamon, Rio 142-143 Guinea Gut at Bethany, St. John, VI 339 Gurabo at Gurabo, Rio 179-180 near Gurabo 181-182 Gurabo, Quebrada Mamey near 177-178 Hardness, definition of 36 Hatillo, Rio Camuy near 66-67 -Hato Rey, Rio Piedras at 148-149 Hondo at Flood Channel near Catafio, Rio 138-139 Hondo basin, Rio, ground-water records in 321 water-quality records in 138-139 Hormigueros, Rio Guanajibo near 265-267 Hormigueros, Rio Rosario near 257-264 Humacao at Highway 3 at Humacao, Rio 214-215 Humacao basin, Rio, water-quality records in 214-215 Hydrologic Bench-Mark Network, definition of 36 Hydrologic conditions, summary of 2-9 Hydrologic unit, definition of 36 Icacos near Naguabo, Rio 211-212 Identification numbers, stations 12-18 InabOn at Real Abajo, Rio 234-235 Inabon basin, Rio, gaging station records in 234-235 Instantaneous discharge, definition of 34 Introduction 1 Jacaguas at Juana Diaz, Rio 231 Jacaguas basin, Rio, gaging station records in 231 Jagual, Quebrada Blanca at El 158-159 Jayuya, Rio Caonillas above Lago Caonillas near 74-75 Jolly Hill Gut at Jolly Hill, St. Croix, VI 340 Joyuda, Quebrada Mamey at 253 Juana Diaz, Rio Jacaguas at 231 Juncos, Quebrada Caimito near 173-174 Juncos, Rio Valenciano near 175-176 Lago Carite No.1 near dam near Cayey 296-299 No. 3 on Rio de la Plata near Cayey 293-295 Lago de Guajataca, Canal Principal de Diversiones at 56-57 No. 1 near dam near Quebradillas 296-299 No. 3 near mouth near Quebradillas 293-295 Rio Guajataca above 54-55 Rio Guajataca below 58-59 Lago Dos Bocas No. 1 near dam near Utuado 296-299 No. 3 at west branch near Utuado 293-295 Lago Garzas No. 1 near dam near Adjuntas 296-299 Lago La Plata No. 3 near dam near Naranjito 296-299 No. 5 near mouth near Naranjito 293-295 Lago Loiza at damsite 183 No. 4 near mouth near Caguas 293-295 No. 7 near dam near Trujillo Alto 296-299 Laguna Cartagena basin, gaging station records in 250-252 Laguna Cartagena near BoquerOn 250 Laguna Cartagena outflow near Boqueron 251-252 Laguna Joyuda basin, gaging station records in 253 Laguna San Jose No. 2 at San Juan 150 Laguna Tortuguero basin, water-quality records in 110 Laguna Tortuguero outlet near Vega Baja 110 Land-surface datum, definition of 36 La Plata at Proyecto La Plata, Rio de 126-128 at Highway 2 near Toa Alta 136 at Toa Alta 133-135 near Comerio 129-130 La Plata basin, Rio de, gaging station records in 126-136 ground-water records in 317-320 water-quality partial-record stations, analyses of samples collected in 293-299 water-quality records in 127-135 Lares, Rio Grande de Afiasco near 272-273 Lares, Rio Guajataca at 52-53 Levels for Puerto Rico, ground-water 303-333 Levels for U.S. Virgin Islands, ground water 343-358 Loco at Guanica, Rio 246-247 Loco basin, Rio, water-quality records in 246-247 Los Llanos, Rio Descalabrado near 230 Mamey at Joyuda, Quebrada 253 Mamey near Gurabo, Quebrada 177-178 Mameyes near Sabana, Rio 197-198 Mameyes basin, Rio, gaging station records in 197-198 Manati, Rio Grande de Manati at Highway 2 near 105-109 Maps: Location of continuous surface-water stations and crest-stage gage stations in Puerto Rico 13 Location of ground-water stations in Puerto Rico 15 Location of ground-water stations in the U.S. Virgin Islands 17 Location of maximum concentration of fecal coliform bacteria at sample sites 10 Location of maximum concentration of fecal streptococci bacteria at sample sites 11 Location of surface-water stations in the U.S. Virgin Islands 16 Location of water-quality stations in Puerto Rico 14 Rio Camuy basin 63 Rio Cibuco basin 111 Rio Culebrinas basin 279 Rio Grande de Arecibo basin 69 Rio Grande de Loiza basin 153 INDEX 361 Page Maps: Rio Grande de Manati basin 93 Rio Guajataca basin 51 Rio Guanajibo basin 249 Rio Herrera to the Rio Anton Ruiz basins 189 Rio Hondo to the Rio Puerto Nuevo basins 137 Rio Humacao to the Rio Seco basins 213 Rio InabOn to the Rio Loco basins 233 Rio de la Plat.. basin 125 Rio Salinas to the Rio Jacaguas basins 227 Rio YagOez and the Rio Grande de Afiasco basins 269 Maunabo at Maunabo, Rio 220-221 Maunabo basin, Rio, water-quality records in 220-221 Maximum concentrations of fecal coliform bacteria at sampled sites, map showing location of 10 Maximum concentrations of fecal streptococci bacteria at sampled sites, map showing location of.... 11 Mayaguez, Rio YagOez near 270-271 Mean concentration, definition of 41 Mean discharge, definition of 34 Measuring point, definition of 36 Metamorphic stage, definition of 36 Methylene blue active substances, definition of 36 Micrograms per gram, definition of 36 Micrograms per liter, definition of 36 Milligrams of carbon per area or volume per unit time for periphyton and macrophytes and for phytoplankton, definition of 40 Milligrams of oxygen per area or volume per unit time for periphyton and macrophytes and for phytoplankton, definition of 40 Milligrams per liter, definition of 36 Moca, Rio Culebrinas at Highway 404 near 282-283 Morovis, Rio Grande de Manati near 96-98 Naguabo, Rio Icacos near 211-212 Naranjito, Lago La Plata No. 3 near dam near 296-299 Naranjito, Lago La Plata No. 5 near mouth near 293-295 Naranjito, Rio Guadiana near 131-132 National Stream-Quality Accounting Network, definition of 37 National Trends Network, definition of 38 Natural substrate, definition of 42 Networks and programs, special 9 Organic mass, definition of 33 Organism, definition of 38 Organism count/area, definition of 38 Organism count/volume, definition of 38 Orocovis near Orocovis, Rio 94-95 Parameter code, definition of 38 Partial record station, definition of 38 Partial-record stations, Discharge at 289 Particle size, definition of 38 Particle-size classification, definition of 38 Patillas, Rio Grande de Patillas near 224-226 Percent composition, definition'of 39 Periphyton, definition of 39 Pesticides, definition of 39 Phytoplankton, definition of 39 Picocurie, definition of 39 Piedras, at Hato Rey, Rio 148-149 near Rio Piedras 146-147 Plankton, definition of 39 Playa de Guayanes, Rio Guayanes above mouth at 218-219 Polychlorinated biphenyls, definition of 40 Ponce, Rio Bucana floodway channel at Highway 14 bridge near 289 Ponce, Rio Cerrillos near 236-237 Ponce, Rio Portugues at 241-242 Ponce, Rio Portugues at Highway 14 at 289 Ponce, Rio Portugues near 238-240 Portugues at Highway 14 at Ponce, Rio 289 at Ponce 241-242 near Ponce 238-240 Portugues basin, Rio, crest-stage partial-record station in 289 gaging station records in 238 water-quality records in 239-242 Primary productivity, definition of 40 Programs, special networks and 9 Page Providencia, Rio Chico at 222-223 Proyecto La Plata, Rio de La Plata at 126-128 Publications on techniques of water-resources investigations 47-48 Puerto Nuevo basin, Rio, ground-water records in 323-324 water-quality records in 146-151 Quality of water records of Puerto Rico, surface- and 51-285 Quebrada Arenas, Rio Grande de Loiza at 156-157 Quebradillas, Lago Guajataca No. 1 near dam near 296-299 Quebradillas, Lago Guajataca No. 3 near mouth near... 293-295 Quebradillas, Rio Guajataca above mouth near 60-62 Radiochemical program, definition of 40 Real Abajo, Rio InabOn at 234-235 Records, explanation of 9-31 Records of ground-water levels 28-30 Records of ground-water quality 30-31 Records of stage and water discharge 18-23 Records of surface-water quality 23-28 Recoverable from bottom material, definition of 40 Return period, definition of 40 Rio Grande, Rio Espiritu Santo near 194-196 Rio Piedras, Rio Piedras near 146-147 Rosario at Rosario, Rio 256 near Hormigueros 257-264 Runoff, in inches, definition of 40 Sabana at Sabana, Rio 199-200 Sabana basin, Rio, gaging station records in 199-200 Sabana, Drainage ditch below Warner Lambert Lab. near 118-119 Sabana, Rio Mameyes near 197-198 Salvatierra near San Lorenzo, Quebrada 160-161 San German, Rio Guanajibo near 254-255 San Juan, Bahia de San Juan no. 5 at 151 San Juan, Laguna San Jose No. 2 at 150 San Lorenzo, Quebrada Salvatierra near 160-161 San Sebastian, Rio Culebrinas near 280-281 San Sebastian, Rio Grande de Afiasco near 274-276 Seco basin, Rio, ground-water records in 326 Sediment, definition of 41 Sodium-adsorption-ratio, definition of 42 Sonadora near El Verde, Quebrada 190-191 Solute, definition of 42 Special network and programs 9 Specific conductance, definition of 42 Stage-discharge relation, definition of 42 Station identification numbers 12-18 St. Croix, VI, Jolly Hill Gut at Jolly Hill 340 St. John, VI, Guinea Gut at Bethany 339 Streamflow, definition of 42 St. Thomas, VI, Bonne Resolution Gut at Bonne Resolution 337 St. Thomas, VI, Turpentine Run at Mariendal 338 Substrate, definition of 42 Summary of hydrologic conditions 2-9 Surface and quality-of-water records for Puerto Rico. 51-285 Surface area, definition of 42 Surface-water quality, records of 23-28 Surface-water records for U.S. Virgin Islands 337-340 Surface-water and crest-stage gage stations in Puerto Rico, map showing location of 13 Surface-water stations in U.S. Virgin Islands, map showing location of 16 Surficial bed material, definition of 42 Suspended, definition of 42 Suspended-recoverable, definition of 43 Suspended sediment, definition of 41 Suspended-sediment concentration, definition of 41 Suspended-sediment discharge, definition of 41 Suspended-sediment load, definition of 41 Suspended-total, definition of 43 Tanama at Charco Hondo, Rio 88-89 near Utuado 80-87 Taxonomy, definition of 43 Techniques of water-resources investigations, publications on 46-47 Terms, definition of 32-45 Thermograph, definition of 43 362 INDEX Page Page Time-weighted average, definition of 43 Toa Alta, Rio de La Plata at 133-135 Toa Alta, Rio de La Plata at Highway 2 near 136 Tons per acre-foot, definition of 44 Tons per day, definition of 44 Toronja at El Verde, Quebrada 192-193 Total, definition of 44 Total coliform bacteria, definition of 32 Total discharge, definition of 44 Total organism count, definition of 38 Total-recoverable, definition of 44 Total sediment discharge, definition of 41 Total-sediment load, definition of 41 Tritium network, definition of 44 Trujillo Alto, Lago Loiza No. 7 near dam near 296-299 Trujillo Alto, Rio Grande de Loiza below 184-185 Turabo at Borinquen, Rio 164-165 Turpentine Run at Mariendal, St. Thomas, VI 338 Utuado, Lago Dos Bocas No. 1 near dam near 296-299 Utuado, Lago Dos Bocas No. 3 at west branch near 293-295 Utuado, Rio Grande de Arecibo near 72-73 Utuado, Rio Tanama near 80-87 Valenciano near Juncos, Rio 175-176 Vega Baja, Laguna Tortuguero outlet near 110 Vega Baja, Rio Cibuco at 115-117 Water-discharge, records of stage and 18-23 Water-quality partial-record stations in Puerto Rico, analyses of samples collected at 293-299 Water-quality stations in Puerto Rico, map showing location of 14 Water-resources investigations, publications on techniques of 46-47 Water year, definition of 44 WATSTORE data, Access to 31 WDR, definition of 44 Weighted average, definition of 45 Wells - Puerto Rico: Bayamon basin, Rio de Well 219 - Fort Buchanan No. 1 322 Bucand basin, Rio Well 141 - Restaurada 8A 330 Cibuco basin, Rio Well 70 - Sabana Hoyos 313 Well 211 - Rosario No. 2 314 Well 212 - Ponderosa TW-1 315 Well 213 - Pampano No. 2 316 Camuy basin, Rio Well 203 - Vicente Amador 305 Coamo basin, Rio Well 87 - Alomar 1 328 Culebrinas basin, Rio Well 83 - San Sebastian 332 Well 200 - Aguadilla Cement north 333 Grande de Arecibo basin, Rio Well 204 - Gilberto Rivera 306 Grande de Loiza basin, Rio Well 222 - Campo Rico TW-1 325 Grande de Manati basin, Rio Well 135 - Lederle 307 Well 206 - Plazuela No. 2 308 Well 207 - Cantito La Luisa 309 Well 208 - Acropolis - Manati 310 Well 209 - Coto Norte No. 3 311 Well 210 - Gelo Martinez 312 Guajataca basin, Rio Well 165 - Mateo Perez, Bo. Salto 303 Well 202 - Carmelo Barreto-Garcia 304 Guanajibo basin, Rio Well 143 - Vivoni, Hacienda Amistad 331 Guayanes basin, Rio Well 96 - USGS TW-2 or Yabucoa 7 327 Hondo basin, Rio Well 218 - Levittown No. 7 321 La Plata basin, Rio de Well 214 - Dorado Beach No. 7 317 Well 215 - Maguayo No. 5 318 Well 216 - Pozo Navy - Campanillas 319 Well 217 - Monserrate TW-2 320 Puerto Nuevo basin, Rio Well 220 - Parque San Luis Rey 323 Well 221 - Hyde Park TW-10 324 Seco basin, Rio Well 6 - Juana 5 326 Wells - U.S. Virgin Islands: St. Croix Well 1 - Fairplains 6 (FP6) 343 Well 2 - USGS-10, Fairplains 2 (FP2) 344 Well 3 - Golden Grove 6 (PW6) 345 Well 4 - Golden Grove 1 (PW1) 346 Well 5 - Mahogany Road 3 346 Well 6 - Adventure 28 347 Well 7 - Concordia 14 348 Well 8 - Concordia 1 (main pump house) 348 Well 9 - Concordia 7 349 Well 10 - Barren Spot 5 (PWD-5) 349 St. John Well 1 - NPS-2 (Cruz Bay) 353 Well 2 - NPS-5 (Trunk Bay) 353 Well 3 - NPS-6 (Cinnamon Bay) 354 Well 5 - DPW-6 355 Well 6 - DPW-5 356 Well 7 - DPW-4 356 Well 8 - DPW-3 356 Well 9 - DPW-2 357 Well 10 - DPW-1 357 Well 11 - Guinea Gut Well 358 St. Thomas Well 1 - USGS-8 (Family well-Thatch Farm) 350 Well 2 - Mahogany 15 350 Well 3 - Mahogany 16 350 Well 4 - Mahogany 17 351 Well 5 - Donoe 3 351 Well 6 - Grade School 3 352 Yauco basin, Rio Well 132 - Yauco 2 329 Wet mass, definition of 33 WSP, definition of 45 Yabucoa, Rio Guayanes at 216-217 YagUez near Mayaguez, Rio 270-271 YagUez basin, Rio, water-quality records in 270-271 Yauco basin, Rio, ground-water records in 329 Zooplankton, definition of 39 October 1, 1978 FACTORS FOR CONVERTING INCH-POUND UNITS TO INTERNATIONAL SYSTEM UNITS (SI) The following factors may be used to convert the inch-pound units published herein to the International System of Units (SI). This report contains both the inch-pound and SI unit equivalents in the station manuscript descriptions. Multiply inch-pound units By Length inches (in) feet (ft) miles (mi) 2.54x10' 2.54x10-2 3.048x10-' 1.609x10° Area acres square miles (mil) 4.047x103 4.047x10­ 4.047x1T3 2.590x10° Volume gallons (gal) million gallons cubic feet (ft3 ) cfs-days acre-feet (acre-ft) 3.785x10° 3.785x10° 3.785x10-3 3.785x103 3.785x10-3 2.832x10' 2.832x 10'2 2.447x103 2.447x10-3 1.233x103 1.233x10-3 1.233x10-6 Flow cubic feet per second (ft3 /s) gallons per minute (gal/min) million gallons per day 2.832x10' 2.832x10' 2.832x10-2 6.309x10-2 6.309x10-2 6.309x10-5 4.381 x10' 4.38 lx10-2 Mass tons (short) 9.072x10-' To obtain SI units millimeters (mm) meters (m) meters (m) kilometers (km) square meters (m2 ) square hectometers (hm2 ) square kilometers (km2 ) square kilometers (km2 ) liters (L) cubic decimeters (dm3 ) cubic meters (m3 ) cubic meters (m3 ) cubic hectometers (hm3 ) cubic decimeters (dm3 ) cubic meters (m3 ) cubic meters (m3 ) cubic hectometers (hm3 ) cubic meters (m3 ) cubic hectometers (hm3 ) cubic kilometers (km3 ) liters per second (L/s) cubic decimeters per second (dm3 /s) cubic meters per second (m3 /s) liters per second (L/s) cubic decimeters per second (dm3 /s) cubic meters per second (m3 /s) cubic decimeters per second (dm3 /s) cubic meters per second (m3 /s) megagrams (Mg) or metric tons u.s DEPAK I mEIN . - INT 413 US. 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