USVI Public Records

Document text (beginning — full text at the TXT link above)

Water Resources Data Puerto Rico and the U.S. Virgin Islands Water Year 1988 o,ca,lc AL 424›, 4-.0.014. VA. BE C 0 6 19" St Thomas I Isla c:1 1 St John I Culebra U.S. VIRGIN Isla de Vieques ISLANDS PUERTO RICO Saint Croix I U.S. GEOLOGICAL SURVEY WATER-DATA REPORT PR-88-1 Prepared in cooperation with the Commonwealth of Puerto Rico, the Government of the U.S. Virgin Islands, and other agencies CALENDAR FOR WATER YEAR 1988 1987 OCTOBER NOVEMBER DE CEM BE R SMTWT F S SMTW T F S SMTW T F S 1 2 3 1 2 3 4 5 6 7 1 2 3 4 5 4 5 6 7 8 9 10 8 9 10 11 12 13 14 6 7 8 9 10 11 12 11 12 13 14 15 16 17 15 16 17 18 19 20 21 13 14 15 16 17 18 19 18 19 20 21 22 23 24 22 23 24 25 26 27 28 20 21 22 23 24 25 26 25 26 27 28 29 30 31 29 30 27 28 29 30 31 1988 JANUARY FEBRUARY MARCH SMTWT F S S MTWTI? S SMTW T F S 1 2 1 2 3 4 5 6 1 2 3 4 5 3 4 5 6 7 8 9 7 8 9 10 11 12 13 6 7 8 9 10 11 12 10 11 12 13 14 15 16 14 15 16 17 18 19 20 13 14 15 16 17 18 19 17 18 19 20 21 22 23 21 22 23 24 25 26 27 20 21 22 23 24 25 26 24 25 26 27 28 29 30 28 29 27 28 29 30 31 31 APRIL MAY JUNE SMTWT F S SMT WT F S SMT W T F S 1 2 1 2 3 4 5 6 7 1 2 3 4 3 4 5 6 7 8 9 8 9 10 11 12 13 14 5 6 7 8 9 10 11 10 11 12 13 14 15 16 15 16 17 18 19 20 21 12 13 14 15 16 17 18 17 18 19 20 21 22 23 22 23 24 25 26 27 28 19 20 21 22 23 24 25 24 25 26 27 28 29 30 29 30 31 26 27 28 29 30 JULY AUGUST SEPTEMBER SMTWT F S SMTWTFS SMT WT F S 1 2 1 2 3 4 5 6 1 2 3 3 4 5 6 7 8 9 7 8 9 10 11 12 13 4 5 6 7 8 9 10 10 11 12 13 14 15 16 14 15 16 17 18 19 20 11 12 13 14 15 16 17 17 18 19 20 21 22 23 21 22 23 24 25 26 27 18 19 20 21 22 23 24 24 25 26 27 28 29 30 28 29 30 31 25 26 27 28 29 30 31 Water Resources Data Puerto Rico and the U.S. Virgin Islands Water Year 1988 by R.E. Curtis, Jr., Z. Aquino, P.L. Diaz, and R.J. Vachier St Thomas I c:C • eeb Isla de? St John I Culebra U.S. VIRGIN Isla de Vieques ISLANDS EfZb PUERTO RICO Saint Croix I U.S. GEOLOGICAL SURVEY WATER-DATA REPORT PR-88-1 Prepared in cooperation with the Commonwealth of Puerto Rico, the Government of the U.S. Virgin Islands, and other agencies DEPARTMENT OF THE INTERIOR MANUEL LUJAN, JR., Secretary U.S. GEOLOGICAL SURVEY Dallas L. Peck, Director For additional information on the water resources investigation programs in Puerto Rico and the U.S. Virgin Islands write to: Chief, Caribbean District, Water Resources Division U.S. Geological Survey GPO Box 4424 San Juan, PR 00936 (Telephone: (809) 749-4346) III PREFACE This annual hydrologic data report of Puerto Rico and the U.S. Virgin Islands is one of a series of annual reports that document hydrologic data gathered from the U.S. Geological Survey's surface- and ground-water data- collection networks in each state, Puerto Rico, the U.S. Virgin Islands, and the other Trust Territories. These records of streamflow, ground-water levels, and quality of water provide the hydrologic information needed by state, local and Federal agencies, and the private sector for developing and managing our Nation's land and water resources. The report is the culmination of a concerted effort by dedicated personnel of the U.S. Geological Survey, Water Resources Division who collected, compiled, analyzed, verified, and organized the data, and who typed, edited, and assembled the report. In addition to the authors, who had primary responsibility for assuring that the information contained herein is accurate, complete and adheres to Geological Survey policy and established guidelines, the following personnel contributed significantly to the collection, processing and tabulations of the data: Jose M. Agis Senen Guzman-Rios George Arroyo Karl G. Johnson Angel Class-Cacho Sandra Lagares Iris M. Concepcion Julio Oms Angel G. Ferrer Ana V. Sanchez Carlos Figueroa Josd Rene Sanchez Eduardo Figueroa Luis Santiago-Rivera Javier Garci'a Luis Soler Rend Garcia Jose A. Torres Ralph Gonzalez Heriberto Torres-Sierra Evelyn S. Guevara Ahmed Valencia This report was prepared in cooperation with agencies of the Commonwealth of Puerto Rico, the Government of the U.S. Virgin Islands, and with other federal agencies under the general supervision of Allen L. Zack, District Chief, Caribbean District, San Juan, Puerto Rico. 1. REPORT NO. 2. 3. Recipient's Accession No. REPORT DOCUMENTATION PAGE USGS/WRIVHD-89/280 _ 4. Title and Subtitle 5. Report Date Water Resources Data for Puerto Rico and the U.S. Virgin Island- August 1989 Water Year 1988 6. 7. Author(s) S. Performing Organization Re pt. No. Russell E. Curtis, Jr., Zaida Aquino, USGS-WDR-PR-88-1 Ricardo J. Vachier, Pedro L. Diaz 9. Performing Organization Name and Address 10. Project/Task/Work Unit No. U.S. Geological Survey, Water Resources Division GPO Box 4424 11. Contract(C) or Grant(G) No. San Juan, Puerto Rico 00936 (C) (G) 12. Sponsoring Organization Name and Address 13. Type of Report & Period Covered Annual-Oct. 1, 1987 U.S. Geological Survey, Water Resources Division to Sept. 30, 1988 GPO Box 4424 San Juan, Puerto Rico 00936 14. 15. Supplementary Notes Prepared in cooperation with the Commonwealth of Puerto Rico, the Government of the U.S. Virgin Islands and other agencies. 16. Abstract (Limit: 200 words) Water-resources data for surface-water, quality-of-water, and ground-water records for the 1988 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 lischarge records for 52 streamflow-gaging stations; stage records for 5 reservoirs; water quality records for 16 streamflow-gaging stations, 42 ungaged streamsites, 11 lake sites, 2 lagoons, and 1 bay; and water-level records for 63 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. Identifiers/Open.Ended Terms Puerto Rico, U.S. Virgin Islands, Sampling sites. c. CO' 471 Field/Group — 18. Availability State men: 19. Security Class (This Report) 21. No. of Pages UNCLASSIFIED 474 NO RESTRICTION ON DISTRIBUTION 70. Security Class (This Page) 22. Price UNCLASSIFIED (See ANSI-239.1S) See Instructions on Reverse OPTIONAL FORM 272 (4-77) (Formerly NTIS-35) Department of Commerce 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 Precipitation 2 Surface water 3 Ground water 7 Water quality 9 Special networks and programs 11 Explanation of records 11 Station identification numbers 11 Downstream order system 19 Latitude-longitude system 19 Records of stage and water discharge 20 Data collection and computation 20 Data presentation 22 Identifying estimated daily discharge 25 Accuracy of the records 25 Records of surface-water quality 25 Classification of records 26 Arrangement of records 26 On-site measurements and sample collection 26 Water temperature 27 Sediment 28 Laboratory measurements . • • . 28 Data presentation 28 Remark codes 30 Records of ground-water levels 30 Data collection and computation 30 Data presentation 31 Records of ground-water quality 32 Data collection and computation 32 Data presentation 33 Access to WATSTORE data 33 Definition of terms 34 Publications on Techniques of Water-Reiources Investigations 48 Surface- and quality-of-water records for Puerto Rico 51 Water-quality at partial-record stations in Puerto Rico 377 Ground-water records for Puerto Rico 389 Surface-water records for the U.S. Virgin Islands 431 Ground-Water records for the U.S. Virgin Islands 439 Index 457 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 8 3. Map showing location of fecal coliform bacteria concentration at sampled sites 12 4. Map showing location of fecal streptococci bacteria concentration at sampled sites 13 5. Map showing location of continuous surface-water stations in Puerto Rico 14 6. Map showing location of water-quality stations in Puerto Rico 15 7. Map showing location of ground-water stations in Puerto Rico 16 8. Map showing location of surface-water stations in U.S. Virgin Islands 17 9. Map showing location of ground-water stations in the U.S. Virgin Islands 18 10. Grid showing system for numbering wells and miscellaneous site (latitude and longitude) 19 11. Map showing the Rio Guajataca basin 53 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 113 16. Map showing the Rio de la Plata basin 121 17. Map showing the Rio Hondo to the Rio Puerto Nuevo basins 135 18. Map showing the Rio Grande de Loiza basin 155 19. Map showing northeastern river basins the Rio Herrera to the Rio Anton Ruiz basins 281 20. Map showing southeastern river basins the Rio Humacao to the Rio Seco basins 301 21. Map showing south coast river basins the Rio Salinas to the Rio Jacaguas basins 317 22. Map showing south coast river basins the Rio InabOn to the Rio Loco basins 325 23. Map showing the Rio Guanajibo basin 343 24. Map showing the Rio Yaguez and the Rio Grande de Afiasco basins 359 25. Map showing the Rio Culebrinas basin 369 VII TABLES Page Table 1. Island-wide monthly precipitation and annual averages for 1988 water year and the 30-year reference period, 1951-80 3 2. Peak discharges during November 26-27 and December 6-7, 1987 and previously recorded maximum at selected streamflow gaging stations in Puerto Rico 6 3. Maximum ground-water levels in 1988 water year and highest water levels of record in feet below land-surface, at selected ground-water wells in Puerto Rico and the U.S. Virgin Islands 7 4. Surface-water quality stations throughout Puerto Rico with the highest concentration of selected constituents during water year 1988 9 5. Maximum suspended-sediment concentration and load at each station within the Rio Grande de Loiza basin 10 6. Factors for conversion of chemical constituents in milligrams per liter to milli-equivalents per liter 39 viii SURFACE-WATER AND WATER-QUALITY STATIONS, IN DOWNSTREAM ORDER, FOR WHICH RECORDS ARE PUBLISHED (Letter after station name designates type of data: (d) discharge, (c) chemical, (b) biological, (s) sediment, (p) pesticide, (e) elevation) Page RIO GUAJATACA BASIN Rio Guajataca at Lares (c,b) 54 Rio Guajataca above Lago Guajataca (d) 56 Canal Principal de Diversiones at Lago Guajataca (c,b) 58 Rio Guajataca above mouth near Quebradillas (d,c,b) 60 RIO CAMUY BASIN Rio Camuy near Bayaney (d) 64 Rio Camuy near Hatillo (d) 66 RIO GRANDE DE ARECIBO BASIN Lago Garzas near Adjuntas (e) 70 Rio Grande de Arecibo near Adjuntas (c,b) 71 Rio Grande de Arecibo near Utuado (c,b) 73 Rio Caonillas above Lago Caonillas near Jayuya (c,b) 75 Rio Grande de Arecibo below Lago Dos Bocas near Florida (c,b) 77 Rio Grande de Arecibo above Arecibo (d) 79 Rio Tanama near Utuado (d,c,b,$) 81 Rio Tanama at Charco Hondo (d) 88 Rio Grande de Arecibo at Central Cambalache (c,b) 90 RIO GRANDE DE MANATI BASIN Rio Orocovis near Orocovis (c,b) 94 Rio Grande de Manati near Morovis (d,c,b) 96 Lago El Guineo at Damsite (e) 99 Lago Matrullas at Damsite (e) 100 Rio Grande de Manati at Ciales (d) 101 Rio Grande de Manati at Highway 149 at Ciales (c,b) 103 Rio Cialitos at Highway 649 at Ciales (c,b) 105 Rio Grande de Manati at Highway 2 near Manati (d,c,b,p) 107 LAGUNA TORTUGUERO BASIN Laguna Tortuguero Outlet near Vega Baja (c,b) 112 RIO CIBUCO BASIN Rio Cibuco below Corozal (d,c,b) 114 Rio Cibuco at Vega Baja (d,c,b) 117 RIO DE LA PLATA BASIN Rio de La Plata at Proyecto La Plata (d,c,b) 122 Rio de La Plata near Comerio (c,b) 125 Rio Guadiana near Naranjito (c,b) 127 Rio de La Plata at Toa Alta (c,b,s,p) 129 Rio de La Plata at Highway 2 near Toa Alta (d) 132 RIO HONDO BASIN Rio Hondo at Flood Channel near Catafio (c,b) 136 IX SURFACE-WATER AND WATER-QUALITY STATIONS, IN DOWNSTREAM ORDER, FOR WHICH RECORDS ARE PUBLISHED--Continued . Page RIO DE BAYAMON BASIN Lago de Cidra at Damsite near Cidra (e) 138 Rio de Bayamon near Aguas Buenas (c,b) 139 Rio Guaynabo near Bayamon (c,b) 141 Rio de Bayamon at Flood Channel at Bayamon (c,b,p) 143 RIO PUERTO NUEVO BASIN Rio Piedras: Rio Piedras at El Seilorial (d) 145 Laguna San Jose: Bahia de San Juan: Rio Piedras near Rio Piedras (d,c,b,p) 146 Rio Piedras at Rio Piedras (d) 148 Rio Piedras at Hato Rey (c,b) 149 Quebrada Josefina at Pifieiro Avenue (d) 151 Laguna San Jose No.2 at San Juan (c,b) 152 Bahia de San Juan No.5 at San Juan (c,b) 153 QUEBRADA BLASINA BASIN Quebrada Blasina near Carolina (c,b) 156 RIO GRANDE DE LOIZA BASIN Rio Grande de Loiza at Quebrada Arenas (d) 158 Quebrada Blanca at El Jagual (d,$) Rio Gurabo: 160 Quebrada Salvatierra near San Lorenzo (d,$) 168 Rio Cayaguas at Cerro Gordo (d,$) 178 Rio Turabo at Borinquen (d,$) 189 Rio Grande de Loiza at Caguas (d,c,b,$) 199 Rio Caguitas at Highway 30 at Caguas (c,b) 219 Rio Bairoa near Caguas (c,b) 221 Quebrada Caimito near Juncos (s) 223 Rio Valenciano near Juncos (d,$) 231 Quebrada Mamey near Gurabo (d,$) 242 Rio Gurabo at Gurabo (d,$) 252 Rio Gurabo near Gurabo (c,b) 271 Lago Loiza at Damsite (c,b,e) 273 Rio Grande de Loiza below Damsite (d) 275 Rio Grande de Loiza below Trujillo Alto (c,b) 276 Rio Canovanas near Campo Rico (d) 278 RIO ESPIRITU SANTO BASIN Quebrada Sonadora near El Verde (d) 282 Quebrada Toronja at El Verde (d) 284 Rio Espiritu Santo near Rio Grande (d,c,b) 286 RIO MAMEYES BASIN Rio Mameyes near Sabana (d) 289 RIO SABANA BASIN Rio Sabana at Sabana (d) 291 X SURFACE-WATER AND WATER-QUALITY STATIONS, IN DOWNSTREAM ORDER, FOR WHICH RECORDS ARE PUBLISHED--Continued RIO FAJARDO BASIN Rio Fajardo near Fajardo (d,c,b,s,p) Rio Fajardo below Fajardo (c,b) 296 RIO BLANCO BASIN Rio Icacos near Naguabo (d) 298 RIO HUMACAO BASIN Rio Humacao at Las Piedras (d) Rio Humacao at Highway 3 at Humacao (c,b) 302 303 RIO GUAYANES BASIN Rio Guayanes at Yabucoa (c,b,p) Rio Guayanes above mouth at Playa de Guayanes (c,b) 305 307 RIO MAUNABO BASIN Rio Maunabo at Maunabo (c,b) 309 RIO CHICO BASIN Rio Chico at Providencia (c,b) 311 RIO GRANDE DE PATILLAS BASIN Rio Grande de Patillas near Patillas (d,c,b,$) 313 RIO COAMO BASIN Rio Coamo near Coamo (c,b) 318 RIO DESCALABRADO BASIN Rio Descalabrado near Los Llanos (d) 320 RIO JACAGUAS BASIN Rio Jacaguas at Juana Diaz (d) 322 RIO INABON BASIN Rio Inabon at Real Abajo (d) 326 RIO BUCANA BASIN Rio Bucand: Rio Cerrillos near Ponce (c,b) Rio Bucana at Hwy 14 Bridge near Ponce (d) 328 330 RIO PORTUGUES BASIN Rio Portugues near Ponce (d,c,b) Rio Portugues at Ponce (c,b,p) 332 335 RIO GUAYANILLA BASIN Rio Guayanilla near Guayanilla (d) Rio Guayanilla at Central Rufina (c,b,p) 337 339 RIO LOCO BASIN Rio Loco at Guanica (c,b,p) 341 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) 344 RIO GUANAJIBO BASIN Rio Guanajibo near San German (c,b) 346 Rio Rosario near Hormigueros (d,c,b,$) 348 Rio Guanajibo near Hormigueros (d,c,b,p) 355 RIO YAGUEZ BASIN Rio Yaguez near Mayaguez (c,b) 360 RIO GRANDE DE AFIASCO BASIN Rio Grande de Masco near Lares (c,b) 362 Rio Grande de Afiasco near San Sebastian (d,c,b,$) 364 Rio Grande de Afiasco near Afiasco (c,b,p) 367 RIO CULEBRINAS BASIN Rio Culebrinas near San Sebastian (c,b) 370 Rio Culebrinas at Highway 404 near Moca (d) 372 Rio Culebrinas near Aguada (c,b,p) 374 ST. THOMAS, U.S. VIRGIN ISLANDS Bonne Resolution Gut at Bonne Resolution (d) 432 Turpentine Run at Mariendal (d) 434 ST. JOHN, U.S. VIRGIN ISLANDS Guinea Gut at Bethany (d) 435 ST. CROIX, U.S. VIRGIN ISLANDS Jolly Hill Gut at Jolly Hill (d) 436 390 395 400 405 410 415 XII GROUND-WATER WELLS, BY BASIN, FOR WHICH RECORDS ARE PUBLISHED Page RIO GUAJATACA BASIN Well 182422067015100 Local number 165 Well 182647066552400 Local number 202 391 RIO GRANDE DE ARECIBO BASIN Well 182737066370900 Local number 204 392 RIO GRANDE DE MANATI BASIN Well 182544066341500 Local number 205 393 Well 182757066325600 Local number 206 394 Well 182710066303700 Local number 207 Well 182534066283000 Local number 208 396 Well 182634066262500 Local number 209 397 Well 182308066260400 Local number 210 398 RIO CIBUCO BASIN Well 182647066201700 Local number 70 399 Well 182615066235300 Local number 211 Well 182515066194000 Local number 212 401 Well 182330066185700 Local number 213 402 RIO DE LA PLATA BASIN Well 182746066170800 Local number 214 403 Well 182530066135400 Local number 216 404 Well 182655066142400 Local number 217 RIO HONDO TO RIO PUERTO NUEVO BASINS Well 182623066111000 Local number 218 406 Well 182441066082600 Local number 219 407 Well 182413066044000 Local number 220 408 Well 182436066031200 Local number 221 409 RIO GRANDE DE LOIZA BASIN Well 182515065594100 Local number 222 RIO HUMACAO TO RIO SECO BASINS Well 175858066100200 Local number 6 411 RIO GUAYANES BASIN Well 180415065513900 Local number 96 412 RIO SALINAS TO RIO JACAGUAS BASINS Well 175829066232200 Local number 87 413 Well 180002066132200 Local number HW-TW-01 414 Well 180017066132100 Local number HW-TW-02 XIII GROUND-WATER WELLS, BY BASIN, FOR WHICH RECORDS ARE PUBLISHED Page Well 180001066122000 Local number HW-TW-03 416 Well 180000066125200 Local number HW-TW-04 417 Well 175947066130601 Local number HW-TW-05B 418 Well 180006066123700 Local number HW-TW-07 419 Well 175939066121400 Local number HW-TW-08 420 Well 175950066125200 Local number HW-TW-10 421 Well 180012066125500 Local number HW-TW-11 422 Well 175957066123400 Local number HW-TW-13 423 Well 175946066102000 Local number HW-TW-14 424 Well 175955066103000 Local number HW-TW-15 425 RIO INABON TO RIO LOCO BASINS Well 180133066503300 Local number 132 426 RIO GUANAJIBO BASIN Well 180132067033800 Local number 143 427 RIO CULEBRINAS BASIN Well 182018066593200 Local number 83 428 Well 182442067091700 Local number 200 429 ST. CROIX, U.S. VIRGIN ISLANDS Well 174225064471900 Local number 1 440 Well 174225064472000 Local number 2 441 Well 174243064475100 Local number 3 442 Well 174245064475800 Local number 4 443 Well 174308064484400 Local number 6 444 Well 174525064460600 Local number 7 445 Well 174527064460100 Local number 8 445 Well 174532064460300 Local number 9 446 Well 174329064454700 Local number 10 446 ST. THOMAS, U.S. VIRGIN ISLANDS Well 182050064580400 Local number 1 447 Well 182138064543100 Local number 2 447 Well 182138064542500 Local number 3 447 Well 182136064541900 Local number 4 448 Well 182029064535200 Local number 5 448 Well 182038064550300 Local number 6 449 ST. JOHN, U.S. VIRGIN ISLANDS Well 182010064472600 Local number 1 450 Well 182109064460300 Local number 2 450 Well 182116064451000 Local number 3 451 Well 182042064454500 Local number 5 452 Well 182044064454600 Local number 6 453 Well 182044064454800 Local number 7 453 Well 182044064454900 Local number 8 453 Well 182044064455000 Local number 9 454 Well 182044064455200 Local number 10 454 Well 181956064464500 Local number 11 455 XIV THIS PAGE WAS LEFT BLANK INTENTIONALLY 1 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1988 INTRODUCTION The Water Resources Division of the U.S. Geological Survey, in cooperation with local and federal agencies obtains a large amount of data pertaining to the water resources of the Commonwealth of Puerto Rico and the Territory of the U.S. Virgin Islands each water year. These data, accumulated during many water years, constitute a valuable data base for developing an improved understanding of the water resources of the area. To make these data readily available to interested parties outside the Geological Survey, the data are published annually in this report series entitled "Water Resources Data for Puerto Rico and the U.S. Virgin Islands, 1988." This report includes records' on both surface and ground water. Specifically, it contains: (1) Discharge records for 52 streamflow-gaging stations, stage records for 5 reservoirs; (2) water-quality records for 16 streamflow-gaging stations, and for 42 ungaged streamsites, 11 lake sites, 2 lagoon, and 1 bay; and (3) water-level records for 63 observation wells. Water-resources data for Puerto Rico for calendar years 1958-67 were released in a series of reports entitled "Water Records of Puerto Rico". Water-resources data for the U.S. Virgin Islands for the calendar years 1962-69 were released in a report entitled "Water Records of U.S. Virgin Islands." Included were records of streamflow, ground-water levels, and water-quality data for both surface and ground water. Beginning with the 1968 calendar year, surface-water records for Puerto Rico were released separately on an annual basis. Ground-water level records and water-quality data for surface and ground water were released in companion reports covering periods of several years. Data for the 1973-74 reports were published under separate covers. Water-resources data reports for 1975-76, 1977, 1978, 1979-80, 1981-82, 1983, 1984, 1985, 1986, and 1987 water years consist of one volume each and contain data for streamflow, water quality and ground water. Publications similar to this report are published annually by the Geological Survey for all States. These official Survey reports have an identification number consisting of the two-letter State abbreviation, the last two digits of the water year, and the volume number. For example, this volume is identified as "U.S. Geological Survey Water-Data Report PR-88-1". 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, 1988 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 Precipitation was higher than usual in the 1988 water year. Precipitation averaged about 122 percent of normal, islandwide, varying from 135 percent of normal in the eastern part of the island to 99 percent of normal in the western part of the island. Monthly average precipitation islandwide for water year 1988 and the 30-year (1951-80) normal as reported by the National Oceanic and Atmospheric Administration are listed in table 1. 3 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1988 Table 1. Island-wide monthly precipitation and annual averages for 1988 water year and the 30-year reference period, 1951-80. 30-year Water year 1988 normal Month (inches) (inches) Oct. 7.41 7.74 Nov. 13.22 5.95 Dec. 7.54 4.32 Jan. 3.10 3.08 Feb. 3.03 2.35 Mar. 2.36 2.62 Apr. 5.29 4.63 May 5.26 6.48 June 5.13 5.58 July 5.20 5.48 Aug. 11.56 7.28 Sept. 7.85 7.78 TOTAL 76.95 63.29 Surface Water Streamflow in Puerto Rico was above normal during water year 1988. A comparison of 1988 streamflow at 4 index or representative gaging stations to their long-term median and extreme monthly flows is shown in figure 1. Flows during October were below normal throughout much of the island. The October mean flow for the Rio Grande de Anasco gaging station, which is in the western part of the island, was only 53 percent of the median monthly flow. In November, an upper level trough became stationary over the eastern portion of the island. Heavy rain was developed during November 26, causing severe flooding over the eastern interior portion of Puerto Rico. Monthly mean flows at all four of the index stations were above the long term median in this month. At the Rio Fajardo gaging station in the eastern part of the island, the mean flow for the month was 297 percent of the long term median, and was the third highest November mean flow recorded since the station was installed in 1962. The floods in November 1987 resulted in three deaths and forced the evacuation of about 350 people. A total of about 2,850 houses in 21 municipios received flood damage. Damages to roads and highways due primarily to landslides associated with the flooding were reported in 27 municipios. Damages in terms of cost were estimated near $6 million. •••• 4 MO NTHLY MEAN DIS CHARGE. IN CUBICFEETPER SECOND WEST NORTH RIO GRANDE DE ANASCO NEAR SAN SEBASTIAN RIO GRANDE DE MANATI AT HWY 2 (50144000) (50038100) 4000 4000 ~. 1988 MONTHLY MEAN :•••1 1000 1000 100 20 SOUTH RIO INABON AT REAL ABAJO (50112500) 400 1988 MONTHLY MEAN •.•• 1965-87 MEDIAN MONTHLY •••-.*:• 100 10 cr cr _J o_ 0 0 z w 2 tn 1987 1988 M O NTHLYMEAN DISCHA RGE. I N CUBICFEETPERSECOND 100 20 EAST RIO FAJARDO NEAR FAJARDO (50071000) Unshaded area indicates range between highest and lowest monthly mean discharges for the period of record Figure 1.--Monthly mean discharge of selected streams in Puerto Rico. 5 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1988 One week after the November 26-27 floods, a combination of an approaching cold front and a southeastern flow of moist tropical air induced intense showers and thunderstorms over southeastern and eastern interior parts of Puerto Rico. High rainfall amounts in combination with saturated soil conditions produced by the previous rains ten days before, resulted in severe flash flooding. This caused the death of one person, forced the evacuation of 1,276 people, and damaged or destroyed 13 bridges. During this period, streamflow at the four index recording stations was above average. The monthly mean flow at the Rio Fajardo gaging station was 246 percent of the long term median and the monthly mean flow of Rio Inabon was 200 percent of normal. Damages associated with this flood were estimated near $5 million. Peak discharges for the floods of November and December are given for 10 stations in the affected areas in table 2. In January, above average flows continued, specially along the north coast, where the index station at the Rio Grande de Manati recorded the largest monthly mean flow for January since the station was installed. The mean flow for January at this site was 235 percent of the long term median. At the gaging station on Rio Fajardo, the monthly mean discharge in January was 148 percent of the median. The station on the Rio Grande de Masco in the western part of the island was the only index station with a monthly mean discharge below the median. During February and March, streamflows in the southern and western parts of the island showed a seasonal decline. In the northern and eastern areas, flows continued above normal during February and began to decline in March. Flows for April and May showed a seasonal increase in response to increased rainfall. At most index stations, the monthly means were above the long term median. During June and July streamflow decreased seasonally and continued within the normal range for the season. Streamflows in the eastern and southern parts of the island were below the long term median. In August, increased rainfall produced higher flows islandwide. The monthly mean discharge was 246 percent of the long term median at the Rio Grande de Manati, 194 percent of the median at the Rio Fajardo station, and 162 percent of the median at the Rio Inabon. In September, flows began to decrease in the northern and eastern parts of the island, but continued to increase in the western and southern parts of the island. In general, streamflow islandwide was above the normal range. In the U.S. Virgin Islands, precipitation and streamflow patterns generally were similar to those in Puerto Rico. Precipitation was well above normal from November to February and June to September. The highest flows were during November when rainfall was 254 percent above normal. 6 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1988 Table 2. Peak discharges during November 26-27 and December 6-7, 1987 and previously recorded maximum at selected streamflow gaging stations in Puerto Rico Peak discharge Maximum discharge Station Nov.26-27 Dec.6-7 of record Period number and (cubic feet (cubic feet (cubic feet Water of name per second) per second) per second) Year Record 50051310 Rio Cayaguas at Cerro Gordo 8,990 9,610 13,200 1979 10-77 to 9-88 50053050 Rio Turabo at Borinquen 13,800 3,600 11,600 1985 12-83 to 9-88 50055000 Rio Grande de Loiza at Caguas 28,900 28,000 71,500 1960 12-59 to 9-88 50056400 Rio Valenciano near Juncos 27,500 40,000 25,700 1985 1-71 to 9-88 50056900 Quebrada Mamey near Gurabo 2,740 2,190 1,190 1985 12-83 to 9-88 50057000 Rio Gurabo at Gurabo 45,000 50,600 74,600 1960 10-59 to 9-88 50061800 Rio Canovanas near Campo Rico 12,500 8,920 15,000 1982 3-67 to 9-88 50063440 Quebrada Sonadora near El Verde 635 2,230 1,410 1984 3-83 to 9-88 50063800 Rio Espiritu Santo near Rio Grande 9,330 20,000 12,400 1984 8-66 to 9-88 50067000 Rio Sabana at Sabana 3,940 1,830 9,010 1983 10-79 to 9-88 50081000 Rio Humacao at Las Piedras 6,580 20,000 20,800 1960 7-74 to 9-77 10-87 to 9-88 7 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1988 GROUND-WATER LEVELS Ground-water levels in many aquifers throughout the island increased during November and December 1987 and by May, August, and September of 1988 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). Ground-water levels in wells in the north coast limestone aquifers of Puerto Rico remained practically unchanged during the first half of the water year but increased slighly in April, May and August as a result of above normal rainfall (fig. 2). Ground-water levels in the south coast alluvial aquifers followed a cyclic pattern associated with rainfall and ground-water withdrawals for public supply, industrial, and irrigation uses. Above normal precipitation during late November and early December caused the water levels to rise significantly. Water levels increased 6.0 ft at the Alomar index well, and 9.0 ft at the Yauco PPG-4 index well. The water levels generally decreased as a result of pumpage from December to August. During late August and early September this trend was reversed as above normal rainfall returned to the area. Ground-water levels fluctuations in the U.S. Virgin Islands (St. Thomas, St. Croix, and St. John) were similar to those in Puerto Rico. The water level in observation well 11 at Guinea Gut, on St. John Island increased 15.7 ft. during November 1987 and 10.7 ft. in September 1988 in response to above-normal precipitation, but declined during much of the intervening period (fig. 2). Table 3. Maximum ground-water levels in 1988 water year and highest water levels of record (in feet below land-surface) at selected ground-water wells in Puerto Rico and the U.S. Virgin Islands Well Local Location 1988 Date Previous Date Period of Name number extreme extreme Record Saltos 1 165 PR 44.06 09-30-88 47.62 09-30-87 1-82 to 9-88 Plazuela 2 206 PR 3.75 09-11-88 3.86 05-16-87 10-85 to 9-88 Hyde Park TW-10 221 PR 1.34 04-16-88 1.48 04-12-87 12-85 to 9-88 Yabucoa 7 96 PR 13.10 12-02-87 13.39 11-18-85 04-78 to 9-88 Aguadilla Cement 200 PR 2.24 08-25-88 2.85 05-14-87 10-85 to 9-88 Fairplains 2 2 St. Croix 20.82 01-22-88 20.91 11-27-85 6-83 to 9-88 11-29-85 Golden Grove 6 3 St. Croix 13.73 12-12-88 14.76 03-25-82 3-82 to 9-88 Concordia 14 7 St. Croix 10.76 01-19-88 12.54 06-17-87 3-82 to 9-88 Concordia 1 8 St. Croix 14.03 01-19-88 16.68 11-13 -84 3-82 to 9-88 Mahogany 16 3 St. Thomas 10.25 01-21-88 17.52 07-01-86 3-82 to 9-88 8 20 25 30 m WELL 70, SABANA HOYOS < 0 35 La OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 0 < 1987 1988 I. cr D Cr) I 15 0 Z < 20 WELL 87, ALOMAR 1 _I 25 _I L1J CO — 30 LI 1........ i LiZ 35 OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 2 1987 1988 LA1 > LAI _J Lt LAJ I- 4tr 10 20 WELL 11, CUINEA GUT ST. JOHN, U.S.V.I. 30 OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1987 1988 Figure 2 .--Ground--water levels at selected wells in Puerto Rico and the U.S. Virgin Islands. 9 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1988 Water Quality In the 1988 water year, the U.S. Geological Survey, in cooperation with local goverment agencies, completed the fourth year of sampling for the constituents listed in table 4. These constituents were added to the water quality monitoring program in 1985 and are in addition to the major chemical constituents and physical properties monitored in the continuing water quality monitoring program in Puerto Rico. The highest concentration of selected constituents detected during the 1988 water year along with the station at which these concentrations were detected are summarized in table 4. Table 4. Surface-water quality stations throughout Puerto Rico with highest concentration of selected constituents during water year 1988 [All constituent concentrations are in milligrams per liter. MBAS: Methylene blue active substance] Station Number Station name Constituent Concentration 50035500 Rio Grande de Manati at Sulfide 0.8 Hwy 149 at Ciales 50047530 Rio Hondo at Flood Channel Boron .23 near Catano 50091000 Rio Maunabo at Maunabo Manganese 2.2 50091000 Rio Maunabo at Maunabo Iron 47 50055250 Rio Caguitas at Hwy 30 Zinc .79 at Caguas 50055250 Rio Caguitas at Hwy 30 Cyanide .2 at Caguas 50091800 Rio Chico at Providencia Phenols .03 50091800 Rio Chico at Providencia MBAS 3.8 The presence of high concentrations of fecal coliform (FC) and fecal streptococci (FS) bacteria continued to be the principal surface water quality problem in Puerto Rico during water year 1988. Bacteria concentration exceeding one million colonies per hundred milliliters of raw water were found at several stations including Rio Piedras at Hato Rey (50049100), Quebrada Blasina near Carolina (50050300), Rio Bairoa near Caguas (50055400), Rio Chico at Providencia (50091800), and Rio Culebrinas near Aguada (50149100). These sites are located near urban zones, industrial parks, and suburban zones and receive the effluent of the sewage treatment plants. 10 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1988 Four sediment stations were operated during the water year. These stations are Rio Tanama near Utuado (50028000), Rio Grande de Loiza at Caguas (50055000), Rio Gurabo at Gurabo (50057000), and Rio Rosario near Hormigueros (50136400). Maximum sediment concentrations were 3,440 milligrams per liter (mg/L) at the Rio Tanama site, 4,880 mg/L at the Rio Grande de Loiza site, 9,220 mg/L at the Rio Gurabo site, and 3,380 mg/L at the Rio Rosario site. Maximum sediment loads at these sites were 16,200 tons per day (ton/d) at Rio Tanama site, 227,000 (ton/d) at Rio Grande de Loiza site, 686,000 (ton/d) at Rio Gurabo site, and 6,160 (ton/d) at Rio Rosario site. From October 1983 to September 1986, an investigation was conducted in one of the most important basins in Puerto Rico; Rio Grande de Loiza. During the study suspended-sediment samples were collected at nine stations within the basin to account the amount of suspended-sediment transported to Lago Loiza, the most important water-supply reservoir in the area. Maximum suspended- sediment concentration and load at each station are summarized in table 5. Table 5. Maximum suspended-sediment concentration and load at each station within the Rio Grande de Loiza Basin. [--, insufficient data to establish a relation of suspended-sediemnt condentration and discharge.] Maximum sediment Maximum sediment Station Station concentration loads name number (mg/L) (tons per day) 1984 1985 1986 1984 1985 1986 Quebrada Blanca at El Jagual 50051150 6,720 7,320 -- 25,800 15,200 Qbda. Salvatierra near San Lorenzo 50051180 2,350 2,570 2,430 15,400 15,500 12,300 Rio Cayaguas at Cerro Gordo 50051310 1,400 5,180 2,790 9,840 77,800 17,900 Rio Turabo near Borinquen 50053050 3,510 7,420 5,300 19,600 106,000 39,400 Rio Grande de Loiza at Caguas 50055000 1,860 2,870 7,470 9,840 77,800 17,900 Quebrada Caimito near Juncos 50055650 247 1,040 1,040 26 702 777 Rio Valenciano near Juncos 50056400 593 1,580 1,600 4,990 46,300 25,100 Quebrada Mamey near Gurabo 50056900 328 528 643 224 1,060 684 Rio Gurabo at Gurabo 50057000 732 1,870 1,670 7,030 93,200 60,800 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1988 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 1988 water year that began October 1, 1987 and ended September 30, 1988. A calendar of the water year is provided on the inside of the front cover. The records contain streamflow data, water-quality data for surface and ground water, and ground-water-level data. The locations of the stations and wells where the data were collected are shown in figures 3 to 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. 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. ATLANTIC° o' 18.30 Rio Culebri llfc Guallaba o Grande Rio Grande ff. Allesca Rib Degaeo dv Palma go 18*00' 102 p0 ti 3 KILOMETERS 20 MILES MAR CARIBE FECAL COLFORMS < 1000 1000 - 10,000 10,000 - 100,000 100,000 - 1,000,000 < 1,000,000 Figure 3.--Location of fecal coliform bacteria concentration at sampled sites. 87°15' 0 4 OCEAN° ATLANTIC° lao Culebri s Rfo GuaReba Rio Grand,* tore1:0‘"° o1: ate aPGG° to °9° 00 ot° " 64 *3 110.ara Seo e orate to 4044.0,111t tV Fajardo Rio Grande de ARasco Rio Yagu Rio Guenafibo \Rio Daguao Quabrada Palma flag* Rio 4 t Ruiz Humacao 18°0 • • • FECAL STREPTOCOCCI < 1000 1000 - 10,000 10,600 - 100.000 10 30 KILOMETERS 20 MILES M A R CARIBE • 100,000 - 1,000,000 > 1.000.000 Figure 4.--Location of fecal streptococci bacteria concentration at sampled sites. 45" OCEANO 30 15" ATLANTIC° 6640' 45' 18.30 Rio CulabtIna Rio GuaRatio Grand* f to 6, ,- 14o066o 0 0 01 t 66 13* so ia 11;4FAN 770 .0 3° o e 5­8000.0ted* 00 00 006 ode F lartio Rio Grand* de Afiasto Rio Guano'lb* Rio Rio Blanco Anto'n Rutz 4iit daa Palma 10 ere 30 KILOMETERS 8,\`' v MAR CARIBE EXPLANATION A09" CONTINUOUS STREAMFLOW STATION AND NUMBER Figure 5.--Location of continuous surface-water stations in Puerto Rico. 87•00' 46' 30' 15' 66°0©' 4 ATLANTIC° 18°30 1,110 Rio Calebrinas RIE, Goadab° Rio Grande Rio Grande de AlIsso 010790 0280 0381 Torfugu era 027250 027090 038320 03595• 5110 0396 047530 91 0590 0588 057025 - to Fajardo RA, Yaguez Rio Guano/lb° 140 \Illo Daguao Quebreda Palma Rio Santiago Rio Blanco Rio Antdo Rut, iiieliurnaceo EXPLANATION 30 KILOMETERS MAR CARIBE Figure 6.--Location of water-quality stations in Puerto Rico. *1 6' sr°00' 4 0' 15' 00°0 45' 915°30' OCEANO ATLANTIC° 18°90 (0010)* 44, 6* too VIsta .6° llef.° a as. as da tsia o v. a 306° 3 Rio Culabrina Rio Guillabo Grand* aiardo 1 Rio Grande do ARaso Rio Vague Rio Quanafibo io Dago.* Quabrada Palma Santiago nco Rio Anton Ruiz mace° uayanis 18'001- 10 20, c,0 er o 30 KILOMETERS I 20 MILES 46. $ 04$ le o 9. 0 Jos` <0a6 ,* 4 ,..oce 9 ‘4' e e MAR 6 W-TW-08 -TW- 0? 0,0" 0 see e CARIBE "40 y, e 0" .6 EXPLANATION WELL AND WELL NUMBER Figure 7.--Location of ground-water stations in Puerto Rico. 17 18°24' 18°20' 4 KLø RS 1. 1 3 4 MLES 06(y 4 4°40' ST. JOHN 18°22' 4 KLOMETERS 18°18' 3 4 MLES 17°46' 0 1 2 3 4 KLOMETERS 1I 1 17°401 I i 2 3 4 MLES Figure 8.--Location of surface-water stations in the U.S. Virgin Islands. 18 18°24' 85°08' ST. THOMAS 84%0' 18°20' ei) 0 1 2 3 4 KILOMETERS I I I i • 1 0 1 2 3 4 MILES 18°22' 84°50' ST. JOHN 4' urur C) 0 i 2 3 4 K LOMETERS I I I I I I 1 2 3 4 MLES i Figure 9.--Location of ground-water stations in the U.S. Virgin Islands. 19 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1988 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). 66°53' 52' 51' 50' 49' 48' 66°47' 18°02 COORDINATES FOR WELLS 27 (180150088474900) 134 127 .74 AND 74 (180135088471000) 1326! 01' 13111 COORDINATES FOR WELLS 132 (180133086503300) AND 134 (180120088503200) 18°00' NN, COORDINATES FOR WELL 131 (180068066602700) 16 40 COORDINATES FOR WELL 16 (175922088495800) 17°59' A' Figure 10.--Grid showing system for numbering wells and miscellaneous sites (latitude and longitude). 20 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1988 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. Continuous records of stage are obtained with analog recorders that trace continuous graphs of stage or with digital recorders that punch stage values on paper tapes at selected time intervals or electronic satellite data collector platforms that receive stage values at slected time intervals. Measurements of discharge are made with current meters using methods adapted by the Geological Survey as a result of experience accumulated since 1880. These methods are described in standard textbooks, in Water-Supply Paper 2175, and in U.S. Geological Survey Techniques of Water-Resources Investigations, Book 3, Chapter A6. 21 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1988 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. 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 22 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1988 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. 23 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1988 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. 24 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1988 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. 25 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1988 Identifying Estimated Daily Discharge Estimated daily-discharge values published in the water-discharge tables are identified by flagging individual daily values with the letter symbol "e" and printing a table footnote, "e Estimated." Accuracy of the Records The accuracy of streamflow records depends primarily on: (1) The 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 3to the nearest hundredth of a cubic foot per sscond for values less than 1 ft /s; to the neirest tenth between 1.0 and 10 ft /s; to whole numbers betyeen 10 and 1,000 ft /s; and to 3 significant figures for more than 1,000 ft /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. 26 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1988 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. 27 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1988 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 Network (see definitions) are obtained from at least several verticals. Whether samples are obtained from the centroid of flow or from several verticals, depends on flow conditions and other factors which must be evaluated by the collector. Chemical-quality data published in this report are considered to be the most representative values available for the stations listed. The values reported represent water-quality conditions at the time of sampling as much as possible, consistent with available sampling techniques and methods of 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. 28 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1988 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. 29 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1988 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. 30 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1988 Remark Codes The following remark codes may appear with the water-quality data in this report: PRINTED OUTPUT REMARK E Estimated value Actual value is known to be greater than the value shown Actual value is known to be less than the value shown K Results based on colony count outside the acceptance range (non-ideal colony count) L Biological organism count less than 0.5 percent (organism may be observed rather than counted) D Biological organism count equal to or greater than 15 percent (dominant) Biological organism estimated as dominant Records of Ground-Water Levels Only ground-water level data from a basic network of observation wells are published herein. This basic network contains observation wells so located that the most significant data are obtained from the fewest wells in the most important aquifers. Data Collection and Computation Measurements of water levels are made in many types of wells under varying conditions, but the methods of measurement are standardized to the extent possible. The equipment and measuring techniques used at each 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. 31 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1988 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 and as an instantaneous observation at noon. Water levels are reported to as many significant figures as can be justified by the local conditions. For example, in a measurement of a depth to water of several hundred feet, the error of determining the absolute value of the total depth to water may be a few tenths of a foot, whereas the error in determining the net change of water level between successive measurements may be only a hundredth of a few hundredths of a foot. For lesser depths to water, the accuracy is greater. Accordingly, most measurements reported to a hundredth of a foot, but some are given to a tenth of a foot or a larger unit. Data Presentation Each well record consists of two parts, the station description and the data table of water levels observed during the water year. The description of the well is presented first through use of descriptive headings preceding the tabular data. The comments to follow clarify information presented under the various headings. LOCATION.--This paragraph follows the well-identification number and reports the latitude and longitude (given in degrees, minutes, and seconds); a landline location designation; the hydrologic-unit number; the distance and direction from a geographic point of reference; and the owner's name. AQUIFER.--This entry designates by name (if a name exists) and geologic age the aquifer(s) open to the well. WELL CHARACTERISTICS.--This entry describes the well in terms of depth, diameter, casing depth and/or screened interval, method of construction, use, and additional information such as casing breaks, collapsed screen, and other changes since construction. DATUM.--This entry describes both the measuring point and the land- surface elevation at the well. The measuring point is described physically (such as top of collar, notch in top of casing, plug in pump base and so on), and in relation to land surface (such as 1.3 ft above land-surface datum). The elevation of the land-surface datum is described in feet above mean sea level datum, if available. It is reported with precision depending on the method of determina­ tion. 32 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1988 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 instantaneous water-level observation at noon. The highest and lowest water levels of the water year are shown on a line below the table. Because all values are not published for wells with recorders, the extremes may be values that are not listed in the table. Missing records are indicated by dashes in place of the water level. Records of Ground-Water Quality Records of ground-water quality in this type of report differ from other types of records in that for most sampling sites they consist of only one set of measurements for the water year. The quality of ground water ordinarily changes only slowly; therefore, for most general purposes one annual sampling, or only a few samples taken at infrequent intervals during the year, is sufficient. Frequent measurement of the same constituents is not necessary unless one is concerned with a particular problem, such as monitoring for trends in nitrate concentration. In the special cases where the quality of ground water may change more rapidly, more frequent measurements are made to identify the nature of the changes. Data Collection and Computation The records of ground-water quality in this report were obtained mostly as a part of special studies in specific areas. Consequently, a number of chemical analyses are presented for some counties but none are presented for others. As a result, the records for this year, by themselves, do not provide a balanced view of ground-water quality Statewide. Such a view can be attained only by considering records for this year in context with similar records obtained for these and other counties in earlier years. 33 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1988 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 34 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1988 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. 35 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1988 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. Fecal streptococcal bacteria are bacteria found also in intestines of warm-blooded animals. Their presence in water is considered to verify fecal pollution. They are characterized as Gram-positive, cocci bacteria which are capable of growth in brain-heart infusion broth. In the 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 iooplankton and phytoplankton are expressed in grams per cubic meter (g/T ), and periphy­ ton and benthic organisms in grams per square meter (g/m ). 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). 36 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1988 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. 37 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1988 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 11.-- log2 i=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. 38 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1988 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 6. 39 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1988 Table 6. 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. 40 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1988 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. 41 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1988 Percent composition is a unit for expressing the ratio of a particular part of a sample or population to the total sample or population, in terms of types, numbers, mass or volume. Periphyton is the assemblage of microorganisms attached to and living upon submerged solid surfaces. While primarily consisting of algae, they also include bacteria, fungi, protozoa, rotifers, and other small organisms. Pesticides are chemical compounds used to control undesirable organisms. Major categories of pesticides include insecticides, miticides, fungicides, herbicides, and rodenticides. Picocurie (PC, pCi) is one trillionth (1 X 10-12) of the amount of ratioactivity represented by a curie (Ci). A curie is the amount of radio­ lu activity that yields 3.7 x 10 radioactive disintegrations per second. A picocurie yields 2.22 dpm (disintegrations per minute). Plankton is the community of suspended, floating, or weakly swimming organisms that live in the open water of lakes and rivers. Phytoplankton is the plant part of the plankton. They are usually microscopic and their movement is subject to the water currents. 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. 42 WATER RESOURCES DATA FOR PUERTO RICO AND TilE U.S. VIRGIN ISLANDS, 1988 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 is preferred for use in unenriched waters. Unit time may be either hour or day, depending on the incubation period. Milligrams of oxygen per area or volume per unit Sime [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. 43 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1988 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. 44 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1988 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 plexigla§s strips for periphyton. Surface area of a lake is that area outlined on the latest U.S.G.S. topographic map as the boundary of the lake and measured by a planimeter in acres. In localities not covered by topographic maps, the areas are computed from the best maps available at the time planimetered. All areas shown are those for the stage when the planimetered map was made. Surficial bed material is that part (0.1 to 0.2 ft) of the bed material that is sampled using U.S. Series Bed-Material Samplers. Suspended (as used in tables of chemical analyses) refers to the amount (concentration) of the total concentration in a water-sediment mixture. It is associated with the material retained on a 0.45-micrometer filter. 45 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1988 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. 46 WATER RESOURCES DATA FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1988 Time-weighted average is computed by multiplying the number of days in the sampling period by the concentrations of individual constituents for the corresponding period and dividing the sum of the products by the total number of days. A time-weighted average represents the composition of water that would be contained in a vessel or reservoir that had received equal quantities of- water from the stream each day for the year. Tons per acre-foot indicates the dry mass of dissolved solids in 1 acre-foot of water. It is computed by multiplying the concentration of the constituent, in milligrams per liter by 0.00136. Tons per day (T/DAY) is the quantity of a substance in solution or suspension that passes a stream section during a 24-hour period. Total is the total amount of a given constituent in a representative water-suspended sediment sample, regardless of the constituent's physical or chemical form. This term is used only when the analytical procedure assures measurement of at least 95 percent of the constituent present in both the dissolved and suspended phases of the sample. A knowledge of the expected form of the constituent in the sample, as well as the analytical methodology used, is required to judge when the results should be reported as "total." (Note that the word "total" does double duty here, indicating both that the sample consists of a water-suspended sediment mixture and that the analytical method determined all of the constituent in the sample.) Total discharge is the total quantity of any individual constituent, as measured by dry mass or volume, that passes through a stream cross-section per unit of time. This term needs to be qualified, such as "total sediment discharge," "total chloride discharge," and so on. Total, recoverable is the amount of a given constituent that is in solution after a representative water-suspended sediment sample has been digested by a method (usually using a dilute acid solution) that results in dissolution of only readily soluble substances. Complete dissolution of all particulate matter is not achieved by the digestion treatment, and thus the determination represents something less than the "total" amount (that is, less than 95 percent) of the constituent present in the dissolved and suspended phases of the sample. To achieve comparability of analytical data, equivalent digestion procedures are required of all laboratories performing such analyses, because different digestion procedures are likely to produce different analytical results. Tritium Network is a network of stations which has been established to provide baseline information on the occurrence of tritium in the Nation's surface waters. In addition to the surface-water stations in the network, tritium data are also obtained at a number of precipitations stations. The purpose of the precipitation stations is to provide an estimate sufficient for hydrologic studies of the tritium input to the United States. WATER RESOURCES FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS, 1988 Water year in Geological Survey reports dealing with surface water supply is the 12-month period, October 1 through September 30. The water year is designated by the calendar year in which it ends and which includes 9 of the 12 months. Thus, the year ending September 30, 1980, is called the "1980 water year." WDR is used as an abbreviation for "Water-Data Report" in the REVISED RECORDS paragraph to refer to State annual hydrologic-data reports (WRD was used as an abbreviation for "Water-Resources Data" in reports published prior to 1976). Weighted average is used in this report to indicate discharge-weighted average. It is computed by multiplying the discharge for a sampling period by the concentrations of individual constituents for the corresponding period and dividing the sum of the products by the sum of the discharges. A discharge- weighted average approximates the composition of water that would be found in a reservoir containing all the water passing a given location during the water year after thorough mixing in the reservoir. WSP is used as an abbreviation for "Water-Supply Paper" in references to previously published reports. 47 48 PUBLICATIONS ON TECHNIQUES OF WATER-RESOURCES INVESTIGATIONS The U.S. Geological Survey publishes a series of manuals describing procedures for planning and conducting specialized work in water-resources investigations. The material is grouped under major subject headings called books and is further divided into sections and chapters. For example, Section A of Book 3 (Applications of Hydraulics) pertains to surface water. The chapter, the unit of publication, is limited to a narrow field of subject matter. This format permits flexibility in revision and publication as the need arises. The reports listed below are for sale by the U.S. Geological Survey, Books and Open-File Reports Section, Federal Center, Box 25425, Denver, Colorado 80225 (authorized agent of the Superintendent of Documents, Government Printing office). Prepayment is required. Remittance should be sent by check or money order payable to the U.S. Geological Survey. Prices are not included because they are subject to change. Current prices can be obtained by writing to the above address. When ordering or inquiring about prices for any of these publications, please give the title, book number, chapter number, and "U.S. Geological Survey Techniques of Water-Resources Investigations." 1-D1. Water temperature--influential factors, field measurement, and data presentation, by H. H. Stevens, Jr., J. F. Ficke, and G. F. Smoot: USGS--TWRI Book 1, Chapter 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-resources investigations, by W. S. Keys and L. M. MacCary: USGS--TWRI Book 2, Chapter El. 1971. 126 pages. 3-Al. General field and office procedures for indirect discharge measurements, by M. A. Benson and Tate Dalrymple: USGS--TWRI Book 3, Chapter Al. 1967. 30 pages. 3-A2. Measurement of peak discharge by the slope-area method, by Tate Dalrymple and M. A. Benson: USGS--TWRI Book 3, Chapter A2. 1967. 12 pages. 3-A3. Measurement of peak discharge at culverts by indirect methods, by G. L. Bodhaine: USGS-.-TWRI Book 3, Chapter A3. 1968. 60 pages. 3-A4. Measurement of peak discharge at width contractions by indirect methods, by H. J. Matthai: USGS--TWRI Book 3, Chapter A4. 1967. 44 pages. 3-A5. Measurement of peak discharge at dams by indirect methods, by Harry Hulsing: USGS--TWRI Book 3, Chapter A5. 1967. 29 pages. 3-A6. General procedure for gaging streams, by R. W. Carter and Jacob Davidian: USGS--TWRI Book 3, Chapter A6. 1968. 13 pages. 3-A7. Stage measurements at gaging stations, by T. J. Buchanan and W. P. Somers: USGS--TWRI Book 3. Chapter A7. 1968. 28 pages. 3-A8. Discharge measurements at gaging stations, by T. J. Buchanan and W. P. Somers: USGS--TWRI Book 3, Chapter A8. 1969. 65 pages. 3-A9. Measurement of time of travel and dispersion in streams by dye tracing, by E. F. Hubbard, F. A. Kilpatrick, L. A. Martens, and J. F. Wilson, Jr.: USGS--TWRI Book 3, Chapter A9. 1982. 44 pages. 3-A10. Discharge ratings at gaging stations, by E. J. Kennedy: USGS--TWRI Book 3, Chapter A10. 1984. 59 pages. 3-All. Measurement of discharge by moving-boat method, by G. F. Smoot and C. E. Novak: USGS--TWRI Book 3, Chapter All. 1969. 22 pages. 3-Al2. Fluorometric procedures for dye tracing, by J. F. Wilson, Jr., E. D. Cobb, and F. A. Kilpatrick: USGS--TWRI Book 3, Chapter Al2. 1986. 41 pages. 3-A13. Computation of continuous records of streamflow, by E. J. Kennedy: USGS--TWRI Book 3, Chapter A13. 1983. 53 pages. 3-A14. Use of flumes in measuring discharge, by F. A. Kilpatrick and V. R. Schneider: USGS--TWRI Book 3, Chapter A14. 1983. 46 pages. 3-A15. Computation of water-surface profiles in open channels, by Jacob Davidian: USGS--TWRI Book 3, Chapter A15. 1984. 48 pages. 3-A16. Measurement of discharge using tracers, by F. A. Kilpatrick and E. D. Cobb: USGS--TWRI Book 3, Chapter A16. 1985. 52 pages. 3-A17. Acoustic velocity meter systems, by Antonius Laenen: USGS--TWRI Book 3, Chapter A17. 1985. 38 pages. 3-B1. Aquifer-test design, observation, and data analysis, by R. W. Stallman: USGS--TWRI Book 3, Chapter 61. 1971. 26 pages. 49 PUBLICATIONS ON TECHNIQUES OF WATER-RESOURCES INVESTIGATIONS--Continued 3-B2. Introduction to ground-water hydraulics, a programed test for self-instruction, by G. D. Bennett: USGS--TWRI Book 3, Chapter B2. 1976. 172 pages. 3-B3. Type curves for selected problems of flow to wells in confined aquifers, by J. E. Reed: USGS--TWRI Book 3, Chapter B3. 1980. 106 pages. 3-B5. Definition of boundary and initial conditions in the analysis of saturated ground-water flow systems--An introduction, by 0. L. Franke, T. E. Reilly, and G. D. Bennett: USGS--TWRI Book 3, Chapter B5. 1987. 15 pages. 3-B6. The principle of superposition and its application in ground-water hydraulics, by T. E. Reilly, 0. L. Franke, and G. D. Bennett: USGS--TWRI Book 3, Chapter B6. 1987. 28 pages. 3-Cl. Fluvial sediment concepts, by H. P. Guy: USGS--TWRI Book 3, Chapter Cl. 1970. 55 pages. 3-C2. Field methods for measurement of fluvial sediment, by H. P. Guy and V. W. Norman: USGS--TWRI Book 3, Chapter C2. 1970. 59 pages. 3-C3. Computation of fluvial-sediment discharge, by George Porterfield: USGS--TWRI Book 3, Chapter C3. 1972. 66 pages. 4-Al. Some statistical tools in hydrology, by H. C. Riggs: USGS--TWRI Book 4, Chapter Al. 1968. 39 pages. 4-A2. Frequency curves, by H. C. Riggs: USGS--TWRI Book 4, Chapter A2. 1968. 15 pages. 4-B1. Low-flow investigations, by H. C. Riggs: USGS--TWRI Book 4, Chapter B1. 1972. 18 pages. 4-B2. Storage analyses for water supply, by H. C. Riggs and C. H. Hardison: USGS--TWRI Book 4, Chapter B2. 1973. 20 pages. 4-B3. Regional analyses of streamflow characteristics, by H. C. Riggs: USGS--TWRI Book 4, Chapter B3. 1973. 15 pages. 4-D1. Computation of rate and volume of stream depletion by wells, by C. T. Jenkins: USGS-TWRI Book 4, Chapter Dl. 1970. 17 pages. 5-Al. Methods for determination of inorganic substances in water and fluvial sediments, by M. W. Skougstad and others, editors: USGS--TWRI Book 5, Chapter Al. 1979. 626 pages. 5-A2. Determination of minor elements in water by emission spectroscopy, by P. R. Barnett and E. C. Mallory, Jr.: USGS--TWRI Book 5, Chapter A2. 1971. 31 pages. 5-A3. Methods for analysis of organic substances in water, by D. F. Goerlitz and Eugene Brown: USGS--TWRI Book 5, Chapter A3. 1972. 40 pages. 5-A4. Methods for collection and analysis of aquatic biological and microbiological samples, edited by P. E. Greeson, T. A. Ehlke, G. A. Irwin, B. W. Lium, and K. V. Slack: USGS--TWRI Book 5, Chapter A4. 1977. 332 pages. 5-A5. Methods for determination of radioactive substances in water and fluvial sediments, by L. L. Thatcher, V. J. Janzer, and K. W. Edwards: USGS--TWRI Book 5, Chapter A5. 1977. 95 pages. 5-A6. Quality assurance practices for the chemical and biological analyses of water and fluvial sediments, by L. C. Friedman and D. E. Erdmann: USGS--TWRI Book 5, Chapter A6. 1982. 181 pages. 5-Cl. Laboratory theory and methods for sediment analysis, by H. P. Guy: USGS--TWRI Book 5, Chapter Cl. 1969. 58 pages. 6-Al. A modular three-dimensional finite-difference ground-water flow model, by M. G. McDonald and A. W. Harbaugh: USGS--TWRI Book 6, Chapter Al. 1988. 586 pages. 7-Cl. Finite difference model for aquifer simulation in two dimensions with results of numerical experiments, by P. C. Trescott, G. F. Pinder, and S. P. Larson: USGS--TWRI Book 7, Chapter Cl. 1976. 116 pages. 7-C2. Computer model of two-dimensional solute transport and dispersion in ground water, by L. F. Konikow and J. D. Bredehoeft: USGS--TWRI Book 7, Chapter C2. 1978. 90 pages. 7-C3. A model for simulation of flow in singular and interconnected channels, by R. W. Schaffrannek, R. A. Baltzer, and D. E. Goldberg: USGS--TWRI Book 7, Chapter C3. 1981. 110 pages. 8-Al. Methods of measuring water levels in deep wells, by M. S. Garber and F. C. Koopman: USGS-­ TWRI Book 8, Chapter Al. 1968. 23 pages. 8-A2. Installation and service manual for U.S. Geological Survey manometers, by J. D. Craig: USGS­ -TWRI Book 8, Chapter A2. 1983. 57 pages. 8-B2. Calibration and maintenance of vertical-axis type current meters, by G. F. Smoot and C. E. Novak: USGS--TWRI Book 8, Chapter B2. 1968. 15 pages. 50 THIS PAGE WAS LEFT BLANK INTENTIONALLY 51 Surface and Quality-of-Water Records for Puerto Rico 52 THIS PAGE WAS LEFT BLANK INTENTIONALLY 53 de Diversion AGOADILLA Drainage boundaries indeterminate in limestone terrane stone Igneous anc \---• — sedimentary rocks .0 Rio Culbrinos: F41'0 Grande de s A sco in EXPLANATION Autos SURFACE—WATER STATION AND NUMBER V0105 QUALITY—OF—WATER STATION AND NUMBER QUALITY—OF—WATER PARTIAL RECORD V010720 STATION AND NUMBER 0165 WELL AND WELL NUMBER Map area SA IN 4 WILES 3 410LONETERS Figure 11.--Rio Guajataca basin. 54 RIO GUAJA1ACA BASIN 50010500 RIO GUAJATACA Al EARLS, PR wATER-QUALITY RECORDS LOCATION.--Lat 18 - 18'01". long 66 52'24". at bridge on Highway 111 (km 32.9). 0.1 mi (0.2 km) upstream from Quebrada Anon, and 0.4 mi (0.6 km) northeast of Lares plaza. DRAINAGE AREA.--3.16 mi. (8.18 km.). PERIOD OF RECORD.--Water years 1958-71, 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 DIS- OXYGEN. OXYGEN COI I- STREP­ CHARGE. SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR DATE TIME FEET PER DUCT- ANCE (STAND- ARD ATURE WATER BID- ITY D1S- SOLVED CENT SATUR- (HIGH LEVEL) UM-MF (COLS./ (COLS. PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) SEP 1987 29... 0940 3.6 198 7.40 23.0 0.1 7.9 94 12 K6600 25000 DEC 14... 1020 5.0 244 7.20 22.0 4.8 7.7 90 40 2600 4100 FEB 1988 02... 1050 1.7 246 7.20 21.5 0.70 7.7 89 21 2700 22000 APR 11... 1115 0.87 250 7.10 23.0 1.2 8.7 104 27 2600 2000 JUN 07... 1030 2.8 249 6.90 23.5 2.3 7.4 89 55 1900 1600 AUG 02... 0945 2.0 252 6.70 22.5 0.90 7.5 88 17 30000 4100 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SLUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE D1S- 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) SEP 1987 29... 89 10 26 5.9 12 0.6 2.4 79 -0.5 8.0 11 DEC 14... 90 FEB 1988 02... - 92 APR 11... 98 0 28 6.8 13 0.6 2.3 92 -0.5 12 12 JUN 07... 80 AUG 02... 94 0 27 6.5 12 0.6 2.1 89 9.8 10 SOLIDS. RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN. 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) SEP 1987 29... 0.20 31 140 1.40 1 1.59 0.01 1.60 0.03 0.17 DEC 14... 5 1.69 0.01 1.70 0.02 1.5 FEB 1988 02... 1 1.16 0.04 1.20 0.02 0.28 APR 11... 0.30 30 167 0.04 3 -0.01 0.50 0.02 JUN 07... -1 -0.01 1.10 0.03 AUG 02... 0.20 30 155 0.84 1 1.09 0.01 1.10 0.02 0.28 K = non-ideal count 55 RIO GUAJATACA BASIN 50010500 RIO GUAJATACA AT TARES, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE LABLE 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) SEP 1987 29... 0.2 1.8 0.07 1 <100 10 <1 9 10 DEC 14... 1.5 3.2 14 0.06 FEB 1988 02... 0.3 1.5 6.6 0.10 APR 11... <0.2 0.08 6 <100 30 <1 <1 260 JUN 07... <0.2 0.06 AUG 02... 0.3 1.4 6.2 0.06 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS 1.6) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) SEP 1987 29... 860 ,5 60 <0.10 3 <1 10 <0.010 1 0.01 DEC 14... FEB 1988 02... APR 11... 170 <5 60 <0.10 <1 <1 60 <0.010 2 0.02 JUN 07... AUG 02... I RIO GUAJATACA BASIN 56 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 Lap Guajataca, 1.0 mi (1.6 km) east of Eneas and 2.0 mi (3.2 km) west of Piletas. DRAINAGE AREA.--Indeterminate. WATER-DISCHARGE RECORDS PERIOD OF RECORD.--July 1984 to current year. GAGE.--Water-stage recorder. Elevation of gage is 565 ft (172 m), from topographic map. REMARKS.--Records fair. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 2,600 ft'/s (73.6 110/s), May 18, 1985, gage height, 12.03 ft (3.667 ), from rating curve extended above 100 ft'/s (2.83 m'/s) on the basis of step-backwater analysis: minimum discharge, 1.9 ft ) /s (0.054 m /s), Feb. 11, 17, 1986, Feb. 9, 1988. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,500 ft'/s (42.5 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (mi/s) (ft) (m) Date Time (ft'/s) (m'/s) (ft) (m) Oct. 7 1615 *2,450 69.4 *11.77 3.587 Sept.20 1730 1,600 45.3 10.20 3.109 May 26 1645 2,190 62.0 11.33 3.453 Minimum discharge, 1.9 ft'/s (0.054 m'/s), Feb. 9. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 22 35 39 12 117 2 87 6.8 62 54 7.1 5.3 2.8 14 25 32 9.7 80 3 37 6.6 32 24 8.6 5.0 2.9 26 20 65 30 55 4 107 6.4 14 18 8.2 4.4 3.2 24 16 36 32 40 5 43 5.6 17 16 6.3 4.3 3.4 25 15 92 13 36 1 9.5 15 8.7 70 9.1 4.7 2.6 64 12 29 7 340 15 45 14 5.4 4.2 3.8 9.9 13 34 11 36 8 108 7.9 25 12 5.2 4.5 3.4 8.8 13 26 10 6 21 5.3 85 15 5.8 4.1 9.6 12 13 27 9 43 14 20 12 3.3 4.2 3.4 66 12 21 9.1 28 10 72 9.4 18 11 6.3 4.2 3.0 67 10 20 8.7 36 11 54 22 16 10 7.2 4.2 3.9 245 20 17 8.6 37 12 32 11 83 10 12 4.0 11 108 100 15 8.3 51 13 26 21 49 9.5 7.6 3.9 5.9 53 85 62 7.9 24 14 36 7.9 23 9.2 11 5.0 3.6 36 55 46 32 21 44 28 26 24 15 32 16 19 9.6 7.3 4.6 44 46 16 23 12 18 8.5 6.8 6.1 37 82 36 19 11 19 17 20 86 16 17 6.5 4.7 11 55 27 27 31 17 18 31 23 14 9.3 6.1 4.9 62 31 23 33 84 14 19 20 9.2 57 12 6.0 4.6 78 22 18 25 22 13 20 15 7.6 60 7.8 5.7 3.7 102 20 17 20 48 209 17 13 16 37 85 21 14 7.3 36 7.3 5.2 3.8 116 110 22 13 5.9 26 7.0 5.3 4.0 86 55 104 14 21 37 18 23 13 5.9 20 6.8 5.6 3.7 44 62 14 240 24 13 39 17 6.9 5.8 3.9 28 26 202 13 247 142 25 11 29 19 6.5 5.0 3.9 26 18 125 13 314 84 26 11 14 15 6.8 6.6 3.7 18 334 63 13 110 66 27 10 53 14 6.3 10 6.4 13 146 44 13 148 56 28 9.6 34 15 6.0 6.5 16 59 157 78 12 131 43 29 8.9 14 14 8.4 5.2 6.5 58 134 84 18 80 36 54 32 30 8.9 11 17 6.9 --- 3.1 45 81 55 15 31 53 --- 44 6.2 2.8 -- 51 --- 11 60 --- TOTAL 1321.9 520.8 918.7 424.0 196.7 148.4 882.5 2035.7 1427 873 1646.3 1807 MEAN 42.6 17.4 29.6 13.7 6.78 4.79 29.4 65.7 47.6 28.2 53.1 60.2 86 85 70 12 16 116 334 202 92 314 240 MAX 340 MIN 8.9 5.3 8.7 6.0 3.3 2.8 2.6 8.8 10 11 7.9 13 CAL YR 1987 TOTAL 11364.9 MEAN 31.1 MAX 340 MIN 3.0 WTR YR 1988 TOTAL 12202.0 MEAN 33.3 MAX 340 MIN 2.6 57 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 1987 TO SEPTEMBER 1988 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) OCT, 06 1039 19.8 351 23.5 APR, 11 1050 3.34 340 23.5 DEC. 17 0917 17.2 362 22.5 MAY, 30 1238 11.2 378 24.5 JAN, 12 1420 10.7 316 22.5 JUN, 06 1139 14.1 367 25.5 FEB, 18 1131 5.72 309 22.0 JUL. 11 1255 16.2 350 25.5 MAR, 07 1435 4.59 366 22.0 AUG. 01 1050 9.55 324 25.0 58 RIO GUAJATACA BASIN 50011000 CANAL PRINCIPAL DE DIVERSIONES AT tAGO DE GUAJATACA, PR WATER-QUALITY RECORDS LOCATION.--Lat 18- 24'02", long 66 55'27", off Highway 476 at Lago (uajataca outlet, 3.0 mi (4.8 km) southwest of Segunda Unidad Baldorioty de Castro, and 5.3 mi (8.5 km) south of Quehradillas Plaza DRAINAGE AREA.--Indeterminate. PERIOD OF RECORD.--Water years 1958-64, 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 10 SEPTEMBER 1988 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) SEP 1987 29... 1130 55 291 6.90 26.5 0.80 1.7 21 20 52 30 DEC 14... 1205 55 292 6.80 25.5 0.90 1.3 16 40 110 130 FEB 1988 02... 1230 60 315 6.90 25.0 2.1 26 K4 K15 APR 11... 1320 75 299 7.00 26.0 0.50 3.9 48 17 K37 170 JUN 07... 1230 El 273 7.50 28.0 0.90 10.3 133 28 300 80 AUG 02... 1140 75 315 6.50 25.5 0.40 1.8 22 20 K2 K2 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SLUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE D1S- 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) SEP 1987 29... 130 3 47 3.8 5.6 0.2 2.0 130 <0.5 11 7.0 DEC 14... 13n FEB 1988 02... 140 APR 11... 130 0 46 4.5 6.4 0.3 2.0 120 ,0.5 11 9.1 JUN 07... 130 AUG 02... 150 9 53 3.6 5.1 0.2 1.6 130 11 7.6 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C. NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) SEP 1987 29... 0.10 8.1 170 25 1 0.09 0.01 0.10 0.08 0.42 DEC 14... 5 0.09 0.01 0.10 0.50 0.40 FEB 1988 02... 2 0.09 0.01 0.10 0.13 0.77 APR 11... 0.20 8.8 169 34 3 0.09 0.01 0.10 0.05 0.15 JUN 07... 1 0.09 0.01 0.10 0.05 0.35 AUG 02... 0.10 7.0 172 35 2 0.09 0.01 0.10 0.03 0.27 K non-ideal count E . estimate RIO GuAJATACA BASIN 50011000 CANAL PRINCIPAL DE DIVERSIONES AT LAGO DE GUAJATACA, PR--Continued WATER-QUALITY UAIA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA • NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL IOTA. ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/I (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/I AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) SEP 1987 29... 0.5 0.52 0.01 2 -100 10 1 2 10 DEC 14... 0.9 0.50 0.02 FEB 1988 02... 0.9 0.90 4.4 0.03 APR 11... 0.2 0.25 0.02 2 -100 10 1 •1 400 JUN 07... 0.4 0.45 0.03 AUG 02... 0.3 0.40 0.02 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) SEP 1987 29... 130 ,5 180 ‹0.10 3 <1 10 -0.010 2 0.01 DEC 14... FEB 1988 02... -- APR 11... 70 <5 60 -4).10 -1 -1 100 -0.010 -1 0.02 JUN 07... AUG 02... 59 I --- RIO GUAJATACA BASIN 60 50011400 RIO GUAJATACA ABOVE MOUTH NEAR QUEBRADILLAS, PR LOCATION.--Lat 18°28'31", long 66- 57'46", Hydrologic Unit 21010002, on left bank at ford 1.7 mi (2.7 km) upstream from bridge on Highway 2, 1.6 mi (2.6 km) west of Quebradillas plaza, 2.1 mi (3.4 km) upstream from the Atlantic Ocean, and 6.6 mi (10.6 km) downstream from Lago Guajataca. DRAINAGE AREA.--Indeterminate. WATER-DISCHARGE RECORDS PERIOD OF RECORD.--February to May 1969 (monthly measurements only), July 1969 to December 1970, April 1984 to current year. GAGE.--Water-stage recorder. Elevation of gage is 0.0 ft (0.0 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharge, which are poor. Flow regulated by lago Guajataca 6.6 i (10.6 km). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 6,200 ft'is (176 10/s), May 13, 1986, estimated based on a mean daily discharge correlation with station 50011200, 6.5 miles upstream; minimum discharge, 6.2 ft'/s (0.176 m'/s), Sept. 4, 9-12, 1984. EXTREMES FOR CURRENT YEAR.--Maximum discharge, 2,090 ft'/s (59.2 m'/s), June 27, gage height, 6.59 ft (2.009 m); minimum discharge, 15 ft 3/s (0.42 m'/s), Jan. 28, 29. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 e21 23 18 ell() e16 e18 e18 18 233 645 18 26 2 e20 18 e18 ellO e18 e18 e18 16 234 605 18 33 3 e20 e18 e18 ell() e20 e18 17 23 234 588 18 112 4 e19 24 e18 120 e30 e18 17 32 234 571 18 41 5 e19 20 e18 152 e20 e18 17 18 219 457 18 38 19 17 22 37 17 36 7 e22 19 30 129 17 e18 19 16 e18 21 18 58 8 e38 26 e25 21 e16 e18 e18 16 e18 19 17 97 9 22 e21 e22 e20 e16 e18 e18 16 e17 18 17 270 10 e21 19 e21 19 e16 e18 ell 32 17 18 16 1110 6 e19 19 e18 146 ell e18 11 e20 17 e21 19 e16 e19 e17 483 17 18 16 818 12 e19 17 e85 19 16 e19 e17 80 17 18 16 553 13 19 17 e263 19 e16 e19 el6 27 17 18 16 317 14 61 e17 32 19 e16 e19 el6 21 18 18 16 439 15 57 e17 46 18 e16 e19 e22 20 32 19 16 169 34 19 17 34 17 e24 95 e29 e18 e16 e19 e17 20 69 19 17 31 18 22 54 e26 e18 e17 e19 e25 18 141 19 20 29 19 21 26 e25 e18 e17 e19 e22 17 31 18 18 29 20 20 30 e50 e17 18 e19 27 17 24 18 17 31 16 e26 e17 34 18 e16 e19 e19 19 18 22 18 e16 43 22 e20 18 e31 e17 e18 19 105 16 21 18 16 33 23 e19 e18 e28 17 18 18 21 24 24 18 e16 93 24 e19 el8 27 16 e18 18 17 21 e20 19 e37 ell 18 e19 206 41 26 17 e19 173 25 e19 e19 27 16 18 18 16 20 31 17 168 161 18 18 17 18 25 18 31 146 27 18 e18 e25 16 19 19 18 53 541 26 el8 e18 e26 16 21 21 163 za 17 el8 e24 15 e18 19 16 232 1110 18 23 161 29 17 el8 e24 e15 el8 21 17 230 786 18 19 152 30 17 18 e24 e15 --- 21 27 230 690 19 19 146 31 17 --- e43 e15 19 --- 230 --- 19 18 203B 4922 3364 710 5542 MEAN 22.9 23.2 36.5 41.8 17.7 18.7 27.9 65.7 164 TOTAL 711 696 1133 1295 513 579 836 109 22.9 185 MAX 61 95 263 152 30 21 206 483 645 168 1110 1110 MIN 17 17 18 15 16 18 16 16 17 17 16 26 CAL YR 1987 TOTAL 16373.2 MEAN 44.9 MAX 1190 MIN 6.2 WTR YR 1988 TOTAL 22339 MEAN 61.0 MAX 1110 MIN 15 e Estimated 61 RIO GUAJATACA BASIN 50011400 RIO GUAJATACA ABOVE MOUTH NEAR QUEBRADILLAS, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORD.--Water years 1969 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 DATE SEP 1987 TIME DIS- CHARGE, INST. CUBIC FEET PER SECOND SPE- CIFIC CON- DUCT- ANCE (US/CM) PH (STAND- ARD UNITS) TEMPER- ATURE WATER (DEG C) TUR- BID- ITY (NTU) OXYGEN, DIS- SOLVED (MG/L) OXYGEN, DIS- SOLVED (PER- CENT SATUR- ATION) OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) COLI- FORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) 29... 1515 21 443 7.20 26.0 0.5 8.5 104 10 K49 160 DEC 14... 1440 31 380 7.40 25.0 6.5 8.2 98 28 3200 3900 FEB 1988 02... 1520 ED 399 7.10 24.5 6.7 79 310 470 APR 11... 1600 ED 475 6.90 25.5 0.5 6.4 78 28 300 K10 JUN 07... 1550 19 461 7.00 27.0 1.2 8.6 106 29 K20 K51 AUG 02... 1420 18 475 7.00 25.5 0.6 11.1 133 <10 K29 K20 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SIUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) SEP 1987 29... 209 24 73 7.2 15 0.4 1.1 180 <0.5 9.4 25 DEC 14... 160 FEB 1988 02... 170 APR 11... 210 3 71 7.4 12 0.4 1.3 190 <0.5 7.9 19 JUN 07... 180 AUG 02... 200 13 68 7.2 15 0.5 1.1 180 - 8.9 25 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) SEP 1987 29... 0.10 6.6 250 14 1 1.39 0.01 1.40 0.03 0.27 DEC 14... 5 1.29 0.01 1.30 0.02 0.18 FEB 1988 02... 1 1.38 0.02 1 .40 0.02 0.18 APR 11... 0.10 7.0 249 <1 1.78 0.02 1.80 0.03 0.17 JUN 07... 1 1.49 0.01 1.50 0.04 0.16 AUG 02... 0.10 6.1 244 12 <1 1.49 0.01 1.50 0.02 0.68 K = non-ideal count E = estimate 62 RIO GUAJATACA BASIN 50011400 RIO GUAJATACA ABOVE MOUTH NEAR QUEBRADILLAS, PR—Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 CHRU- NITRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA • NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL IOTA( 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) SEP 1987 29... 0.3 1.7 0.01 1 •100 -10 • 1 • 1 10 DEC 14... 0.2 1.5 6.6 0.02 FEB 1988 02... 0.2 1.6 0.03 APR -1 -1 210 0.28 • 1 '100 -10 JUN 07... 0.2 1.7 7.5 0.01 AUG 02... 0.7 2.2 9.7 0.01 11... 0.2 2.0 - METHY- MANGA- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SHE- 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 SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) AS FE) AS PB) AS MN) AS HG) SEP 1987 '5 -1 <1 '10 -0.010 2 0.05 29... 129 30 -0.10 DEC 14... FEB 1988 02... APR -5 20 -0.10 -1 -1 -10 -0.010 2 0.02 11... 70 JUN 07... AUG 02... 63 OCEANO A ANTICO CAMUY. QUEBRADILLAS R ARECIBO 0157 0148 Drainage boundaries indeterminate in limestone terrane J 4 4uyoney River underground S L ARES Guoiatab basin Ri"o Tarsaindl 14(o Grande de Arecibo basin t_JMeS Igneous and sedimentary rocks UTUADO a Rio Grande Aliasco boctni e boundary A048 EXPLANATION. SURFACE—WATER STATION AND NUMBER p area SAN 4UA T 4 4 vas e motann Figure 12.--Rio Camuy basin. RIO CAMUY BASIN 64 50014800 RIO CAMUY NEAR BAYANEY, PR LOCATION .--Lat 18°23'48", long 66°49'04", Hydrologic Unit 21010002, on left bank at Highway 488, 1.4 mi (2.2 km) southeast of school at Santiago, 0.9 mi (1.4 km) northwest from Escuela Manuel A. Rivera at Bayaney and 9.1 mi (14.6 km) upstream from Atlantic Ocean. DRAINAGE AREA.--Indeterminate. WATER-DISCHARGE RECORDS PERIOD OF RECORD.--May 1984 to current year. GAGE.--Water-stage recorder. Elevation of gage is 341 ft (104 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 6,450 ft'/s (183 m'/s), Oct. 7, 1985, gage height, 17.66 ft (5.383 m), from rating curve extended above 300 ft'/s (8.50 m'/s) on basis of step-backwater analysis; minimum discharge, 28 ft'/s (0.79 m'/s), Mar. 15-17, 1985. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 2,000 ft 3 /s (56.6 .1 3 /s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (fti/s) (.0/s) (ft) (m) Date Time (W/s) (1. 3/s) (ft) (m) Apr. 21 1815 *2,910 82.4 *13.52 4.121 Sept. 23 2130 2,070 58.6 11.60 3.536 May 10 2030 2,640 74.8 12.92 3.938 Minimum daily discharge, 31 ft'/s (0.878 m'/s), Mar. 25-27. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 59 82 70 315 56 38 34 104 82 121 51 196 2 87 58 146 286 54 43 33 86 73 98 50 149 3 82 138 168 136 106 39 35 79 69 88 54 106 4 67 91 87 105 95 38 33 72 64 81 77 90 5 62 60 91 92 60 37 34 66 60 173 58 81 6 57 53 119 85 53 37 38 64 59 179 52 76 7 142 52 113 80 50 36 37 58 57 97 62 119 8 193 69 84 77 50 36 34 55 57 83 50 95 9 104 70 76 74 48 36 36 122 58 77 47 89 10 72 76 72 69 48 33 595 57 75 135 35 46 72 47 118 11 73 59 69 66 47 36 35 686 57 12 71 56 69 65 45 35 49 392 64 69 44 117 13 71 88 106 62 46 36 60 210 138 63 43 129 14 158 65 74 61 58 35 39 147 120 66 40 106 15 116 57 78 66 45 35 40 146 94 69 49 88 16 73 84 70 59 44 36 95 200 69 62 43 81 17 65 189 64 72 44 37 98 187 93 61 45 76 18 73 117 67 68 45 36 151 118 74 CO 98 75 19 117 79 137 62 44 35 268 100 66 67 69 73 20 119 70 202 56 43 33 244 98 74 58 50 428 21 81 64 153 55 41 33 845 98 61 57 85 384 22 69 102 40 486 499 54 58 53 32 87 54 177 23 61 56 85 52 39 34 150 81 374 54 49 581 24 66 77 79 51 39 32 99 76 255 53 285 397 25 60 129 99 51 39 e31 97 72 300 53 706 191 26 60 84 81 49 40 e31 97 76 162 52 264 154 27 55 143 76 48 50 31 95 158 105 52 220 168 28 53 167 70 48 41 88 163 140 276 51 262 152 29 50 94 66 49 39 87 212 194 351 52 263 120 30 50 78 63 50 --- 45 177 104 218 67 155 110 31 64 --- 183 47 40 --- 88 --- 57 113 --- TOTAL 2530 2563 3019 2509 1449 1211 3849 4749 4076 2341 3531 4861 MEAN 81.6 85.4 97.4 80.9 50.0 39.1 128 153 136 75.5 114 162 MAX 193 189 202 315 106 88 845 686 499 179 706 581 MIN 50 52 63 47 39 31 33 55 57 51 40 73 CAL YR 1987 TOTAL 31951 MEAN 87.5 MAX 472 MIN 31 WTR YR 1988 TOTAL 36688 MEAN 100 MAX 845 MIN 31 e Estimated 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 1987 TO SEPTEMBER 1988 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE PURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) OCT, 07 1401 53.7 299 24.5 APR, 12 1248 36.4 326 24.0 DEC, 14 1323 73 310 23.5 MAY, 05 1215 108 326 24.0 JAN, 13 1223 61 301 23.5 JUN, 08 1159 52.6 341 24.5 FEB, 17 1222 43.5 309 23.0 JUL, 13 1144 61.5 336 24.5 MAR, 08 1249 35.3 363 23.0 AUG, 03 1241 50.3 319 24.5 65 RIO CAMUY BASIN 66 50015700 RIO CAMUY NEAR HATILLO, PR LOCATION.--Lat 18- 27'44", long 66'49'56", Hydrologic Unit 21010002, 1.8 mi (2.9 km) southwest of Hatillo plaza. and 1.8 mi (2.9 km) southeast of Camuy plaza, 1.2 mi (1.9 km) south of Planta de Purification, and 3.3 mi (5.5 km) upstream from Atlantic Ocean. DRAINAGE AREA.--Indeterminate. WATER-DISCHARGE RECORDS PERIOD OF RECORD.--June 1984 to current year. GAGE: --Water-stage recorder. Elevation of gage is 13 ft (4 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 10,500 ft'/s (297 m'/s), Oct. 7, 1985, gage height, 24.75 ft (7.544 m), from rating curve extended above 200 ft'/s (5.66 m'/s) on basis of step-backwater analysis; minimum discharge, 36 ft'/s (1.02 m'/s), Mar. 19, 1985. 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) (mi/s) (ft) (m) Date Time (ft-7s) (110/s) (ft) (m) Apr. 21 2300 6,170 175 20.58 6.273 Aug. 25 0300 3,090 87.5 15.96 4.865 May 11 0100 *7,540 214 *22.07 6.727 Sept.20 2345 3,320 94.0 16.40 5.000 June 22 2000 4,500 127 18.39 5.605 Sept.24 0015 3,220 91.2 16.21 4.941 Minimum daily discharge, 37 ft'is (1.05 m'/s), Apr.10. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 65 133 90 596 85 51 45 120 86 150 64 e350 2 76 90 190 782 79 54 43 99 80 121 62 e225 3 98 265 310 234 201 50 42 91 75 109 62 el80 4 74 391 110 158 223 49 41 87 71 101 81 e140 5 72 89 92 139 101 48 40 80 67 221 68 e120 6 68 76 140 127 83 48 41 76 69 J13 62 e110 7 148 73 153 119 75 48 40 70 65 125 72 e170 8 262 101 101 112 70 47 41 69 63 106 73 el20 9 182 87 87 107 66 46 39 106 63 96 61 e110 10 103 104 82 98 66 46 38 e2500 61 93 60 e200 11 101 75 78 90 65 45 39 3560 60 89 60 e180 12 97 71 112 90 63 45 48 1440 72 84 57 e150 13 100 127 164 82 60 46 74 458 119 80 56 e180 14 210 85 87 80 71 47 48 280 106 82 55 e160 15 200 76 152 85 61 46 45 197 110 85 62 155 16 112 95 109 78 59 46 105 262 78 76 60 132 17 103 766 87 89 58 47 114 260 98 75 57 121 18 96 234 83 90 57 46 236 139 172 91 108 115 19 140 125 260 84 55 44 433 117 82 85 85 116 20 206 104 551 76 54 43 399 113 81 73 62 466 21 131 94 328 71 53 42 1410 130 70 71 87 836 22 105 85 166 69 53 42 1670 104 1050 69 67 265 23 94 78 128 69 52 41 193 95 725 66 62 568 24 97 80 111 67 52 42 120 90 370 65 195 865 25 99 180 155 67 52 41 115 85 385 65 1710 240 26 107 109 123 66 54 41 123 82 248 64 357 176 27 92 147 110 65 67 41 120 156 131 64 295 182 28 85 280 101 63 57 73 175 127 293 64 361 196 29 89 125 95 65 53 114 265 193 510 67 e400 138 30 93 101 85 68 --- 58 267 114 366 81 e230 127 31 90 --- 232 64 48 --- 92 --- 70 e170 --- TOTAL 3595 4446 4672 4050 2145 1525 6409 11392 5826 3001 5261 7093 MEAN 116 148 151 131 74.0 49.2 214 367 194 96.8 170 236 MAX 262 766 551 782 223 114 1670 3560 1050 313 1710 865 MIN 65 71 78 63 52 41 38 69 60 64 55 110 CAL YR 1987 TOTAL 51109 MEAN 140 MAX 1480 MIN 37 WTR YR 1988 TOTAL 59415 MEAN 162 MAX 3560 MIN 38 e Estimated 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 1987 TO SEPTEMBER 1988 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFWW, SFECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) OCT, 07 1005 65.5 310 24.5 APR, 12 0833 46.9 336 24.0 DEC, 14 1044 88.9 299 24.0 MAY, 05 0852 79.8 347 23.5 JAN, 13 0911 77.2 326 22.5 JUN, 08 0853 62.3 362 24.0 FEB, 17 0906 57.1 337 22.0 JUL, 13 0842 79.9 355 24.0 MAR, 08 0908 46.6 396 22.5 AUG, 03 0903 60.5 341 24.5 68 THIS PAGE WAS LEFT BLANK INTENTIONALLY 69 HATILLO OCEAN° ATLANTIC° ARECI • BARCELONE TA 02775 eBoyaney Flerida IN Drainage boundaries indeterminate in limestone terrone 027250' e on Limestone Igneous and edimentary rock's 0280 5 0 Rib Comity basin OCC' UTUADO Logo Vie JAYUVA Logo • ,10.ear Pellejos ago A aiuntos Rib Grande de Anasco begirt ADJONTAS R Drainage -boundary ago Gorros EXPLANATION SURFACE-WATER STATION AND NUMBER V0205 QUALITY-OF-WATER STATION AND NUMBER , in QUALITY-OF-WATER PARTIAL RECORD V025 ' STATION AND NUMBER 204 .A6LIAD Li. A riiiRECIO0 AN JUAN • WELL AND WELL NUMBER MAYASUE cgeu4% FAJAROO. I i I I 2 11 I 3 4 MILES I I o E nrawA .....-„, ----‘,!! I 2 3 - 4 5 6 KILOMETERS Figure 13.--Rio Grande de Arecibo basin. 70 RIO GRANDE DE ARECIBO BASIN 50020100 LAGO GARZAS NEAR ADJUNTAS, PR LOCATION.--Lat 18°08'20", long 66°44'29", Hydrologic Unit 21010002, in power gate tower of Garzas Dam on Rio Vacas, 1.7 mi (2.7 km) upstream from Rio Garzas, and 2.2 mi (3.5 km) southwest of Adjuntas. DRAINAGE AREA.--15.6 mi' (40.4 km 2). ELEVATION RECORDS PERIOD OF RECORD.--January to September 1988. GAGE.--Water-stage recorder. Datum of gage is 2,337.82 ft (712.567 m) above mean sea level; gage readings have been reduced to elevations above mean sea level. Prior to May 25, 1988 and May 25 to July 13, 1988, at datums 38.98 ft and 20.18 ft higher. REMARKS.--Satellite data collection platform at station. Lake is formed by earthfill dam completed in 1943. Outflow from lake controlled by vertical-lift sluice gate and fixed-crest concrete spillway. Spillway elevation, 2,415.0 ft (736.09 m). Lake is used for irrigation and power production. Operated by P.R. Electric Power authority. EXTREMES OBSERVED FOR CURRENT PERIOD.--Maximun elevation 2,414.35 ft (735.894 m), Feb. 1; minimun elevation, 2,364.79 ft (720.788 m), Aug. 23, but may have been lower during period of no gage-height record Aug. 23-29. Capacity Table (based on data from Puerto Rico Electric Power Authority) Elevation, in feet Contents, in acre-feet Elevation, in feet Contents, in acre-feet 2,364 660 2,394 2,250 2,382 1,500 2,415 4,082 ELEVATION (FEET NGVD), WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 OBSERVATION AT 24:00 VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 2414.08 2412.90 2403.82 2400.81 2382.71 A 2383.01 2393.59 2 2413.62 2412.55 2403.72 2400.43 2382.28 2383.28 A 3 2413.62 2412.25 2403.61 2399.98 2382.88 2383.05 4 2413.83 2411.93 2403.52 2399.67 2383.13 2382.95 5 2413.78 2411.60 2403.42 2399.24 2383.69 2382.36 6 2413.90 2411.20 2403.31 2398.74 2383.92 2382.26 7 2414.10 2410.87 2403.21 2397.70 2383.36 2381.79 8 2414.16 2410.02 2403.09 2397.63 2382.37 2379.88 9 2413.48 2409.92 2402.98 2397.32 2381.30 2379.35 10 2413.33 2409.37 2402.86 2396.38 2381.11 2379.63 11 2413.29 2409.28 2402.74 2395.81 2380.95 2378.76 12 2412.92 2408.90 2402.63 2395.14 2381.39 A 2378.24 13 2412.46 2409.11 2402.51 2394.56 2381.46 2383.99 2378.27 14 2412.46 2408.84 2402.40 2393.84 2383.62 2383.89 2378.30 15 2412.48 2408.20 2402.40 2393.23 2383.95 2383.35 2378.52 16 2412.48 2407.23 2402.34 2392.82 2384.25 2384.70 2378.10 17 2412.48 2406.36 2402.50 2392.30 2384.49 2385.48 2379.10 18 2412.50 2405.42 2402.48 2391.68 2385.28 2385.89 2380.08 19 2412.50 2404.42 2402.39 2391.03 2385.68 2385.64 2380.79 20 2412.52 2403.49 2402.70 2390.72 2386.05 2385.32 2381.26 21 --- 2412.52 2403.77 2402.68 2389.03 2385.55 2385.38 2381.66 22 --- 2412.82 2403.94 2402.77 2387.66 2384.89 2385.19 2382.22 23 2413.55 2413.00 2404.11 2402.14 2386.20 2384.51 2385.50 2364.89 24 2413.78 2413.17 2404.27 2402.64 2385.85 2384.20 2385.66 A 25 2413.67 2413.35 2404.03 2402.11 2384.80 2384.48 2385.93 26 2413.64 2413.18 2403.83 2401.22 2384.34 2385.47 2385.22 27 2413.62 2413.39 2403.84 2401.19 2383.97 2385.07 2384.66 28 2413.90 2413.56 2404.00 2401.15 2383.44 2388.10 2384.17 29 2413.89 2413.28 2404.06 2400.58 2383.06 A 2383.86 A 30 2414.08 --- 2404.02 2400.77 2382.48 A 2383.39 2394.16 A 31 2414.31 --- 2403.93 --- 2382.52 --- 2383.74 2393.58 MEAN 2413.18 2407.34 2402.53 2392.01 MAX 2414.16 2412.90 2403.82 2400.81 MIN 2412.46 2403.49 2400.58 2382.48 A No gage-height record. RIO GRANDE DE ARECIBO BASIN 71 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 mi 2 (32.9 km 2 ) this does not include 6.0 mi 2 (15.6 km 2) above Lago Garzas. PERIOD OF RECORD.--Water years 1969-74, 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1987 20... 1545 27 286 7.60 27.0 6.1 7.8 103 .10 K1200 2500 DEC 21... 1430 32 237 7.50 24.5 0.5 8.9 106 18 470 550 FEB 1988 23... 1040 14 307 7.90 22.0 0.6 10.3 122 11 250 200 APR 21... 1005 11 329 7.40 25.0 0.4 9.0 113 <10 4800 780 JUN 22... 0910 12 390 7.00 23.0 1.4 7.6 92 14 K1700 800 AUG 22... 0915 12 597 7.60 23.5 4.0 7.2 89 <10 K1300 5600 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM S1UM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED 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 1987 20... 100 8 26 8.9 17 0.8 2.1 94 <0.5 12 17 DEC 21... 90 FEB 1988 23... 100 APR 21... 110 5 29 9.7 19 0.8 0.80 100 <0.5 10 25 JUN 22... 130 AUG 22... 130 9 32 11 57 2 3.4 110 12 94 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE N020403 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 1987 20... 0.10 32 171 12 11 1.22 0.08 1.30 0.06 0.34 DEC 21... <1 1.30 0.10 1.40 0.08 0.12 FEB 1988 23... 4 0.98 0.12 1.10 0.07 0.43 APR 21... 0.20 29 187 5.6 ' <1 0.89 0.11 1.00 0.01 0.29 JUN 22... 3 0.91 0.09 1.00 0.11 0.49 AUG 22... 0.10 30 309 10 <1 0.98 0.12 1.10 0.14 0.36 K = non-ideal count RIO GRANDE DE ARECIBO BASIN 50020500 RIO GRANDE DE ARECIBO NR ADJUNTAS, PR--Continued WATER QUALITY DATA. WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 NITRO- CHRO- GEN,AM- BARIUM. BORON, CADMIUM MIUM. COPPER. MONIA * NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABIE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/I (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 1987 20... 0.4 1.7 7.5 0.11 -1 •100 •10 1 6 <10 DEC 21... 0.2 1.6 7.1 0.12 - FEB 1988 23... 0.5 1.6 7.1 0.21 - APR 21... 0.3 1.3 5.8 0.25 -1 -100 -.10 1 1 <10 JUN 22... 0.6 1.6 7.1 0.15 AUG 22... 0.5 1.6 7.1 0.19 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 FRABLE 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 1987 20... 940 <5 70 <0.10 -1 <1 -10 <0.010 7 0.02 DEC 21... FEB 1988 23... APR 21... 190 <5 70 1.3 ,1 1 40 <0.010 3 0.04 JUN 22... AUG 22... 12 I RIO GRANDE DE ARECIBO BASIN 73 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 i (4.0 km) north of Utuado plaza. DRAINAGE AREA.--66.0 mil (170.9 km') this excludes 6.0 mil (15.5 km•) upstream from Lago Garzas to Rio Guayanes in the Rio Tallaboa basin. PERIOD OF RECORD.--Water years 1959-74, 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 D1S- OXYGEN, OXYGEN COIL- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1981 20... 1230 114 225 7.50 29.0 68 7.2 93 250 K16000 K12000 DEC 21... 1155 144 248 7.20 25.5 4.1 7.9 96 <10 28000 7800 FEB 1988 22... 1100 227 304 7.00 23.5 36 9.2 107 33 29000 28000 APR 20... 1000 81 252 7.10 25.5 18 7.7 93 <10 K11000 4500 JUN 21... 0910 107 194 6.80 24.0 120 7.8 92 <10 25000 24000 AUG 22... 1140 44 304 7.90 27.5 6.8 7.2 46 <10 29000 11000 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SLUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- D1S- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1987 20... 87 13 23 7.1 13 0.6 2.3 74 <0.5 16 10 DEC 21... 79 FEB 1988 22... 72 APR 20... 85 9 22 7.2 12 0.6 1.9 67 <0.5 22 11 JUN 21... 57 AUG 22... 110 15 28 8.6 16 0.7 2.3 89 26 18 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L 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 1987 20... 0.10 27 143 44 14 1.17 0.03 1.20 0.08 0.82 DEC 21... 17 1.25 0.05 1.30 0.09 0.21 FEB 1988 22... 1.02 0.08 1.10 0.59 0.41 APR 20... 0.20 24 146 32 26 1.57 0.03 1.60 0.07 0.33 JUN 21... 148 1.08 0.02 1.10 0.04 1.20 AUG 22... 0.10 27 180 21 6 1.11 0.09 1.20 0.20 0.50 K non-ideal count 74 RIO GRANDE DE ARICIBO BASIN 50025000 RIO GRANDE DE ARECIBO NEAR UTUADO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 CHRO- NITRO- GEN.AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA • NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOv- RECOV- RECOV- RECOV- ERABLE ERABLE ERABLE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS 8) AS CD) AS CR) AS CU) OLI 1987 .1 30 20... 0.9 2.1 9.3 0.09 -1 -100 -10 -1 DEC 21... 0.3 1.6 !.1 0.12 FEB 1988 22... 1.0 2.1 9.3 0.27 APR 20... 0.4 2.0 8.9 0.12 -I -100 -10 1 2 10 JUN 21... 1.2 0.09 AUG 22... 0.7 1.9 8.4 0.17 METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE BLUE MANGA- TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- (MG/L TOTAL STANCE DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CH) (UG/L) (MG/L) OCT 1987 -0.10 1 -1 20 -0.010 2 0.01 20... 5500 8 270 DEC 21... FEB 1988 22... APR 20... 2400 120 <0.10 <5 <1 1 10 • 0.010 2 0.04 JUN 21... AUG 22... 75 RIO GRANDE DE ARECIBO BASIN 50026050 RIO CAONILLAS ABOVE LAGO CAONILLAS NEAR JAYUYA, PR WATER-QUALITY RECORDS LOCATION.--Lat 18- 13'26", long 6638'22", 300 ft (91 m) off Highway 531, 700 ft (213 m) upstream from Lago Caonillas, 3.3 mi (5.3 km) northwest of Jayuya plaza. DRAINAGE AREA.--40.4 mi' (104.6 km•). PERIOD OF RECORD.--Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 DIS- OXYGEN, OXYGEN COLT- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1987 21... 0730 105 160 7.40 23.5 3.2 8.0 96 <10 600 K1200 DEC 22... 0740 75 154 7.10 22.0 0.6 8.3 98 <10 390 K1200 FEB 1988 23... 1405 28 225 7.80 25.0 0.9 7.9 98 13 K20 K45 APR 21... 1315 36 200 7.40 27.5 1.8 7.1 9: <10 K760 270 JUN 22... 1205 35 196 7.30 26.0 26 7.5 93 13 2100 410 AUG 23... 0820 E200 173 7.80 24.0 1.0 8.3 101 <10 4200 4800 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SLUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FIT SULFIDE DIS- D1S- (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 CAM) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1987 21... 62 8 16 5.3 10 0.6 1.5 54 <0.5 13 7.6 DEC 22... 53 FEB 1988 23... 70 APR 21... 69 5 18 5.9 10 0.5 1.4 56 <0.5 15 11 JUN 22... 62 AUG 23... 64 0 17 5.3 8.8 0.5 1.3 59 16 10 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN,. GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1987 21... 0.10 24 110 31 4 0.69 0.01 0.70 0.02 0.18 DEC 22... -1 0.68 0.02 0.70 0.01 0.19 FEB 1988 23... - - 3 0.48 0.02 0.50 0.02 0.28 APR 21... 0.10 23 123 12 92 0.79 0.01 0.80 0.05 0.25 JUN 22... 7 0.59 0.01 0.60 0.03 0.27 AUG 23... 0.10 21 131 5 0.19 0.01 0.20 0.04 0.26 K = non-ideal count E = estimate 76 RIO GRANDE DE ARECIBO BASIN 50026050 RIO CAONILLAS ABOVE LAGO CAONILLAS NEAR JAYUYA, PR--Continued WATER-QUALITY DATA. WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 NITRO- CHRO- GEN.AM- BARIUM. BORON. CADMIUM MIUM. COPPER. MONIA + NITRO- NITRO- PROS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN. PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE BABEL 'ABLE 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 1987 21... 0.2 0.9 0.05 -1 <100 10 ,1 5 <10 DEC 22... 0.2 0.9 0.05 FEB 1988 23... 0.3 0.8 3.5 0.09 - APR 21... 0.3 1.1 4.9 0.11 1 <100 <10 <1 <1 <10 JUN 22... 0.3 0.9 4.0 0.07 AUG 23... 0.3 0.5 2.2 0.08 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 1987 21... 350 •5 20 -0.10 -1 ,1 <10 -0.010 5 0.02 DEC 22... FEB 1988 23... APR 21... 490 ,5 20 1.1 <1 •1 -10 <0.010 ,1 0.02 JUN 22... - AUG 23... 77 RIO GRANDE DE ARECIBO BASIN 50021250 RIO GRANDE DE ARECIBO BELOW IAGO DOS BOCAS NEAR FLORIDA. PR WATER-QUALITY RECORDS LOCATION.--Lat 18- 20'50", long 66- 40'02", at pedestrian bridge. 0.7 mi (1.1 km) downstream from Lago Dos Bocas and 6.6 mi (10.6 km) west of Florida plaza. DRAINAGE AREA.--169 mi' (436 km') does not include 6.0 mi' (15.6 km') above Lago Garzas. PERIOD OF RECORD.--Water years 1970-71, 1974 to current year. D1S- OXYGEN. OXYGEN COL1- STREP- CHARGE. SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL. FECAL. CUBIC CON- PH TEMPER- TUR- OXYGEN. (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1987 20... 1000 E1000 199 6.80 26.5 17 4.5 56 ,10 290 280 DEC 21... 1000 E1500 172 6.40 25.0 23 5.1 61 <10 660 980 FEB 1988 22... 1245 E1700 212 6.50 24.5 4.5 54 K27 K100 APR 20... 1235 E1900 198 6.60 25.5 28 4.9 59 <10 K710 K1400 JUN 21... 1125 35 250 6.40 27.0 5.7 5.1 64 <10 K70 K190 AUG 23... 1130 87 237 7.30 28.5 15 5.4 69 16 K150 920 HARD- ALKA- HARD- NESS MAGNI- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SLUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE. TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT 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 1987 20... 77 8 21 5.9 11 0.6 2.4 69 <0.5 11 9.4 DEC 21... 54 FEB 1988 22... APR 20... 72 4 19 5.9 10 0.5 2.0 61 <0.5 15 9.7 JUN 21... 77 AUG 23... 90 29 24 7.4 12 0.6 2.0 84 11 8.6 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) 5102) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1987 20... 0.10 22 124 102 0.59 0.01 0.60 0.08 0.62 DEC 21... 16 0.79 0.01 0.80 0.02 0.18 FEB 1988 22... 29 0.59 0.01 0.60 0.02 0.28 APR 20... 0.10 19 121 36 0.48 0.02 0.50 0.14 0.16 JUN 21... 11 0.17 0.03 0.20 0.22 0.28 AUG 23... 0.10 23 125 29 35 0.09 0.01 0.10 0.14 0.36 K = non-ideal count E = estimate 78 RIO GRANDE DE ARECIBO BASIN 50027250 RIO GRANDE DE ARECIBO BELOW LAGO DOS BOCAS NEAR FLORIDA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1987 20... 0.7 1.3 5.8 0.03 -1 -100 .10 -1 8 •10 DEC 21... 0.2 1.0 0.05 - FEB 1988 22... 0.3 0.9 4.0 0.02 APR 20... 0.3 0.8 3.5 0.03 5 -100 -10 1 2 20 JUN 21... 0.5 0.7 3.1 0.02 AUG 23... 0.5 0.6 0.04 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1987 20... 830 <5 90 <0.10 -1 <1 40 -0.010 5 0.02 DEC 21... FEB 1988 22... APR 20... 3200 <5 80 <0.10 -1 <1 10 <0.010 1 0.02 JUN 21... AUG 23... 79 RIO GRANDE DE ARECIBU bASIN 50027750 RIO GRANDE DE ARECIBO ABOVE ARECIBO, PR LOCATION.--Lat 18°25'29", long 66°41'44", Hydrologic Unit 21010002, 0.8 mi (1.3 km) upstream from Rio Tanama, 4.0 mi (6.4 km) south of Arecibo and 6.7 mi (10.8 km) above mouth, and 10.2 mi (16.4 km) downstream from Lago Dos Bocas. DRAINAGE AREA.--200 mi' (520 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), from topographic map. REMARKS.--Records fair. Flow regulated by lap Dos Bocas Dam 10.2 mi (16.4 km) upstream. AVERAGE DISCHARGE.--6 years (1983-88), 476 ft'/s (13.48 m'/s), 32.32 in/yr (821 mm/yr), 344,900 acre-ft/yr (425 hm'/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 45,800 ft'/s (1,300 m'/s), May 18, 1985, gage height, 18.22 ft (5.553 m), from floodmark, from rating curve extended above 2,430 ft'is (68.0 m'/s) on basis of slope-area measurement of peak flow; minimum discharge. 30 ft'/s (0.850 e/s), Mar. 30, 1986. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 4,300 ft'/s (122 m'is) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (e/s) (ft) (m) Date Time (ft 3 /s) (m'/s) (ft) (m) Nov. 27 2215 *9,680 274 *12.99 3.959 Minimum discharge, 36 ft'/s (1.020 m'/s), Oct. 11. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 145 111 1160 660 662 752 63 423 79 67 432 215 2 276 59 949 1200 809 115 51 685 86 61 257 178 3 92 198 831 451 928 64 51 178 139 809 88 218 4 245 321 708 815 544 56 368 545 185 386 86 957 5 153 400 175 469 727 56 232 520 66 509 147 239 6 107 542 186 331 243 125 335 329 163 116 306 147 7 270 106 781 459 170 509 109 115 299 585 68 100 8 331 72 1500 751 585 218 105 95 129 228 397 218 9 525 299 1180 572 113 115 358 102 321 842 227 691 10 1020 676 849 107 55 98 529 860 369 290 170 681 11 398 117 584 418 570 252 424 1940 93 88 172 471 12 573 451 200 715 577 576 93 1260 70 65 101 381 13 1080 642 276 441 329 146 497 1220 65 381 77 86 14 781 125 190 409 186 534 405 402 78 157 67 81 15 701 244 86 504 337 661 346 170 71 499 86 141 16 681 803 409 489 123 109 501 429 68 170 288 395 17 575 872 377 268 171 64 328 583 435 117 172 390 18 92 607 426 312 105 157 461 639 111 76 581 171 19 702 222 293 438 518 67 662 726 70 73 117 532 20 847 296 1040 299 84 54 921 144 66 306 761 829 21 127 140 740 372 202 525 1380 561 246 218 300 958 22 85 59 862 479 528 516 1360 837 483 421 78 1150 23 834 537 717 101 674 61 674 562 593 367 533 977 24 285 780 757 73 441 63 503 128 462 105 363 730 25 103 633 184 738 627 54 80 82 95 74 2920 517 26 158 162 278 493 628 54 129 76 71 396 1710 883 27 524 1960 203 241 642 63 646 79 91 91 357 757 28 413 3190 589 503 208 139 564 70 750 440 208 876 29 487 964 457 251 628 128 789 110 417 113 868 797 30 739 1020 403 135 --- 536 1000 297 121 330 1810 723 31 504 --- 279 59 291 --- 212 --- 120 937 --- TOTAL 13853 16608 17669 13553 12414 7158 13964 14379 6292 8500 14684 15489 MEAN 447 554 570 437 428 231 465 464 210 274 474 516 MAX 1080 3190 1500 1200 928 752 1380 1940 750 842 2920 1150 MIN 85 59 86 59 55 54 51 70 65 61 67 81 AC-FT 27480 32940 35050 26880 24620 14200 27700 28520 12480 16860 29130 30720 CFSM 3.19 3.95 4.07 3.12 3.06 1.65 3.32 3.31 1.50 1.96 3.38 3.69 IN. 3.68 4.41 4.69 3.60 3.30 1.90 3.71 3.82 1.67 2.26 3.90 4.12 CAL YR 1987 TOTAL 151217 MEAN 414 MAX 3190 MIN 38 AC-FT 299900 CFSM 2.96 IN. 40.18 WTR YR 1988 TOTAL 154563 MEAN 422 MAX 3190 MIN 51 AC-FT 306600 CFSM 3.02 IN. 41.07 80 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 1987 TO SEPTEMBER 1988 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, 15 1032 108.43 243 26.5 APR, 14 1026 79.6 240 25.0 DEC, 16 1107 99.8 290 25.0 MAY, 10 1002 86.4 276 25.5 JAN, 20 1017 49.3 224 23.5 JUN, 02 1032 63.0 286 27.5 FEB, 22 1027 98.9 229 24.0 JUL, 06 1009 98.8 263 26.0 MAR. 14 1043 56.5 307 25.0 AUG, 05 1025 65.9 252 27.5 RIO GRANDE DE ARECIBO BASIN e1 50028000 RIO TANAMA NEAR UTUADO, PR LOCATION.--Lat 18°18'02". long 66°46'58". Hydrologic Unit 21010001, on downstream side of left abutment of bridge on Highway 111, 1.2 mi (1.9 km) upstream from natural tunnel, 1.5 mi (2.4 km) northeast of Angeles, and 5.8 mi (9.3 km) northwest of Utuado. DRAINAGE AREA.--18.4 mi, (47.7 km 2 ). 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. 17, 1966, non-recording gage and Nov. 17, 1966 to Sept. 30, 1978 recording gage, both at present site. REMARKS.--Records fair except those for estimated daily discharges, which are poor. AVERAGE DISCHARGE.--28 years (1961-88), 48.3 fts/s (1.368 m7s), 35.65 in/yr (906 mm/yr), 34,990 acre-ft/yr (43.1 hm 3 /yr) median of yearly mean discharges, 48 ft 3/s (1.36 ml/s), 34,800 acre-ft/yr (43 hm 3/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 12,190 ft'is (345 e/s), Nay 18, 1985, gage height, 17.45 ft (5.319 m) new datum in use, from floodmark and recorder, from rating curve extended above 500 ft3/s (14.2 m 3/s) on basis of slope-area measurement of peak flow: minimum discharge, 6.6 ft3/s (0.187 e/s), June 12. 1977. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 3,000 ft'is (85.0 e/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft3/s) (m 3/s) (ft) (m) Date Time (ft 3/s) (m 3/s) (ft) (m) Nov.27 1600 *2,910 82.4 *11.55 3.520 Minimum discharge, 12 ft'/s (0.340 e/s), June 4-11. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 23 61 52 84 42 28 19 20 14 22 16 140 2 54 37 66 67 39 27 18 19 14 21 16 e60 3 28 35 50 44 41 22 18 18 14 21 27 e45 4 24 29 45 39 34 21 18 18 13 20 25 e41 5 23 26 86 37 31 21 21 18 13 46 17 e39 6 22 25 79 36 30 20 23 17 12 27 17 38 7 81 81 54 35 29 20 18 17 13 20 17 40 8 140 42 48 33 28 20 17 16 13 19 17 37 9 45 33 44 33 27 19 17 23 12 19 17 42 10 57 28 42 32 27 19 16 73 12 19 18 61 11 63 26 41 32 27 19 21 56 25 19 21 58 12 39 27 39 31 29 19 28 31 68 19 16 67 13 29 29 38 30 29 19 23 22 49 24 15 46 14 63 29 36 65 29 19 17 22 26 26 18 40 15 43 37 37 44 26 18 45 22 21 18 30 73 16 35 29 39 35 25 18 38 18 22 19 21 60 17 28 53 35 42 24 19 33 17 20 147 36 56 18 39 32 34 35 24 19 86 16 54 e41 68 47 19 31 27 111 36 23 17 38 16 51 e24 23 44 20 26 24 84 33 24 17 97 16 44 21 38 93 21 43 24 50 31 23 17 108 15 42 21 31 167 22 47 23 41 31 23 16 83 14 30 22 25 107 23 53 24 37 31 23 16 42 14 25 19 29 213 24 35 90 36 30 23 16 28 14 30 18 403 119 25 27 53 51 30 23 16 23 14 68 20 265 104 26 25 36 35 29 25 16 21 20 40 18 105 189 27 26 351 34 29 34 26 20 26 28 18 98 e98 28 24 113 33 29 23 70 27 54 31 20 84 e70 29 69 67 32 35 22 31 30 32 25 31 55 e60 30 70 57 32 30 --- 21 23 17 23 19 46 e52 31 95 --- 70 29 21 --- 15 --- 17 60 --- TOTAL 1407 1548 1511 1157 807 667 1016 710 852 815 1674 2306 MEAN 45.4 51.6 48.7 37.3 27.8 21.5 33.9 22.9 28.4 26.3 54.0 76.9 MAX 140 351 111 84 42 70 108 73 68 147 403 213 MIN 22 23 32 29 22 16 16 14 12 17 15 37 AC-FT 2790 3070 3000 2290 1600 1320 2020 1410 1690 1620 3320 4570 CFSM 2.47 2.80 2.65 2.03 1.51 1.17 1.84 1.24 1.54 1.43 2.93 4.18 IN. 2.84 3.13 3.05 2.34 1.63 1.35 2.05 1.44 1.72 1.65 3.38 4.66 CAL YR 1987 TOTAL 13146 MEAN 36.0 MAX 351 MIN 14 AC-FT 26080 CFSM 1.96 IN. 26.58 WTR YR 1988 TOTAL 14470 MEAN 39.5 MAX 403 MIN 12 AC-FT 28700 CFSM 2.15 IN. 29.25 e Estimated 82 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 FOR PERIOD OF DAILY RECORD.-- SEDIMENT CONCENTRATIONS: Maximum daily mean, 20,400 mg/L November 27, 1968; minimum daily mean, 0 mg/L during water year 1985. SEDIMENT LOADS: Maximum daily, 167,000 tons (152,000 tonnes) May 18, 1985, minimum daily, 0.0 ton (0.0 tonne) several days during many years. EXTREMES FOR CURRENT YEAR.-- SEDIMENT CONCENTRATIONS: Maximum daily mean, 1,760 mg/L June 02, 1987; minimum daily mean, 2.0 mg/L several days. SEDIMENT LOADS: Maximum daily, 5,930 tons (5,380 tonnes) June 02, 1987; minimum daily, 0.08 ton (0.07 tonne) several days. WATER-QUALITY DATA, WATER YEARS OCTOBER 1987 TO SEPTEMBER 1988 DIS- OXYGEN, OXYGEN COLT- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1987 02... 1115 23 160 8.00 24.5 6.7 9.0 110 16 430 320 DEC 16... 1220 38 154 7.90 23.5 3.4 9.1 109 34 210 200 FEB 1988 04... 1400 35 154 7.90 23.5 2.3 8.8 106 <10 K880 K170 APR 14... 1150 17 166 7.50 23.0 22 9.0 107 29 K730 600 JUN 09... 1315 13 179 7.80 27.5 3.4 8.2 106 29 K80 380 AUG 04... 1400 20 163 7.40 27.0 22 7.9 101 <10 K1100 52 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SLUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED 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 1987 02... 65 8 16 6.0 8.2 0.5 1.9 57 <0.5 13 7.9 DEC 16... 54 FEB 1988 04... 52 APR 14... 61 6 15 5.6 8.2 0.5 2.1 48 <0.5 14 8.4 JUN 09... 56 AUG 04... 63 7 16 5.6 7.8 0.4 2.0 f' 12 8.2 K = non-ideal count RIO GRANDE DE ARECIBO BASIN 50028000 RIO TANAMA NEAR UTUADO. PR--Continued WATER-QUALITY DATA, WATER YEARS OCTOBER 1987 TO SEPTEMBER 1988 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- D1S- 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 PENDEO (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 1987 02... 0.10 26 113 7.0 2 0.59 0.01 0.60 0.04 0.16 DEC 16... -- ,1 0.69 0.01 0.70 0.01 0.19 FEB 1988 04... 1 0.79 0.01 0.80 0.02 0.58 APR 14... 0.10 24 110 5.0 17 0.79 0.01 0.80 0.03 0.17 JUN 09... <1 0.39 0.01 0.40 0.02 0.48 AUG 04... 0.10 22 107 5.9 8 0.49 0.01 0.50 0.02 0.18 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN. GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1987 02... 0.2 0.02 <1 <100 50 1 4 20 DEC 16... 0.2 0.9 4.0 0.02 FEB 1988 04... 0.6 1.4 6.2 0.03 APR 14... 0.2 0.03 ,1 ,100 <10 2 <1 320 JUN 09... 0.5 0.9 4.0 0.01 AUG 04... 0.2 0.7 3.1 0.03 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1987 02... 670 <5 20 <0.10 2 <1 <10 <0.010 7 0.01 DEC 16... FEB 1988 04... APR 14... 1200 7 60 0.20 <I 40 <0.010 4 0.02 JUN 09... AUG 04... 83 84 RIO GRANDE DE ARECIBO BASIN 50028000 RIO TANAMA NEAR UTUADO, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 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 23 27 1.7 61 250 41 52 90 13 2 54 156 64 37 55 5.5 66 229 107 3 28 37 2.8 35 60 5.7 50 100 14 4 24 30 1.9 29 40 3.1 45 70 8.5 5 23 27 1.7 26 36 2.5 86 463 382 6 22 26 1.5 25 32 2.2 79 317 168 7 81 438 554 81 388 460 54 100 15 8 140 1160 2910 42 70 7.9 48 80 10 9 45 150 18 33 40 3.6 44 70 8.3 10 57 152 61 28 25 1.9 42 65 7.4 11 63 245 88 26 15 1.1 41 60 6.6 12 39 70 12 27 15 1.1 39 60 6.3 13 29 40 4.2 29 12 .94 38 57 5.8 14 63 204 124 29 25 2.0 36 56 5.4 15 43 100 12 37 107 30 37 60 6.0 16 35 50 4.7 29 40 3.1 39 60 6.3 17 28 38 2.9 53 109 40 35 55 5.2 18 39 70 7.4 32 40 3.5 _,4 50 4.6 19 31 50 4.2 27 35 2.6 111 352 206 20 26 35 2.5 24 32 2.1 84 250 57 21 43 124 51 24 30 1.9 50 75 10 22 47 153 45 23 29 1.8 41 60 6.6 23 53 150 53 24 30 1.9 37 55 5.5 24 35 60 5.7 90 268 133 36 55 5.3 25 27 35 2.6 53 150 21 51 116 24 26 25 32 2.2 36 30 2.9 35 52 4.9 27 26 30 2.1 351 3440 16200 34 52 4.8 28 24 30 1.9 113 349 128 33 50 4.5 29 69 358 376 67 130 24 32 45 3.9 30 70 318 255 57 100 15 32 45 3.9 31 95 364 219 --- --- --- 70 177 45 TOTAL 1407 4892.0 1548 17149.34 1511 1160.8 85 RIO GRANDE DE ARECIBO BASIN 50028000 RIO TANAMA NEAR UTUADO, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATIUN DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) JANUARY FEBRUARY MARCH 1 84 199 58 42 30 3.4 28 25 1.9 2 67 154 35 39 35 3./ "7 35 2.6 3 44 62 7.4 41 22 2.4 ,. 27 1.6 4 39 59 6.2 34 10 .92 21 25 1.4 5 37 55 5.5 31 9 .75 21 22 1.2 6 36 52 5.1 30 8 .65 20 22 1.2 7 35 50 4.7 29 9 .70 20 20 1.1 8 33 50 4.5 28 8 .60 20 19 1.0 9 33 47 4.2 27 8 .58 19 17 .87 10 32 45 3.9 27 8 .58 19 12 .62 11 32 42 3.6 27 7 .51 19 12 .62 12 31 40 3.3 29 5 .39 19 11 .56 13 30 40 3.2 29 6 .47 19 11 .56 14 65 223 154 29 7 .55 19 10 .51 15 44 60 7.1 26 8 .56 18 10 .49 16 35 50 4.7 25 8 .54 18 10 .49 17 42 49 5.6 24 10 .65 19 10 .51 18 35 47 4.4 24 10 .65 19 10 .51 19 36 45 4.4 23 10 .62 17 10 .46 20 33 42 3.7 24 12 .78 17 10 .46 21 31 42 3.5 23 11 .68 17 10 .46 22 31 42 3.5 23 11 .68 16 10 .43 23 31 40 3.3 23 10 .62 16 9 .39 24 30 40 3.2 23 10 .62 16 9 .39 25 30 40 3.2 23 10 .62 16 9 .39 26 29 40 3.1 25 10 .68 16 8 .35 27 29 39 3.1 34 10 .92 26 30 2.1 28 29 39 3.1 23 10 .62 70 215 111 29 35 37 3.5 22 10 .59 31 50 4.2 30 30 33 2.7 --- --- 21 20 1.1 31 29 30 2.3 21 15 .85 TOTAL 1157 363.0 807 26.03 667 140.32 86 RIO GRANDE DE ARECIBO BASIN 50028000 RIO TANAMA NEAR UTUADO, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 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 19 15 .77 20 25 1.4 14 12 .45 2 18 12 .58 19 20 1.0 14 12 .45 3 18 12 .58 18 20 .97 14 12 .45 4 18 11 .53 18 20 .97 13 11 .39 5 21 20 1.1 18 20 .97 13 11 .39 6 23 60 3.7 17 20 .92 12 10 .32 7 18 42 2.0 17 20 .92 13 10 .35 8 17 40 1.8 16 20 .86 13 10 .35 9 17 35 1.6 23 35 2.2 12 10 .32 10 16 30 1.3 73 384 584 12 10 .32 11 21 30 1.7 56 144 38 25 45 9.0 12 28 40 3.0 31 50 4.2 68 289 232 13 23 40 2.5 22 20 1.2 49 160 21 14 17 20 .92 22 15 .89 26 35 2.5 15 45 121 37 22 15 .89 21 25 1.4 16 38 80 8.2 18 15 .73 22 20 1.2 17 33 60 5.3 17 15 .69 20 25 1.4 18 86 391 338 16 15 .65 54 142 54 19 38 50 5.1 16 15 .65 51 130 29 20 97 628 934 16 15 .65 44 87 14 21 108 323 207 15 15 .61 42 60 6.8 22 83 288 164 14 15 .57 30 40 3.2 23 42 70 7.9 14 15 .57 25 45 3.0 24 28 35 2.6 14 15 .57 30 50 4.1 25 23 30 1.9 14 15 .57 68 236 207 26 21 25 1.4 20 33 3.6 40 70 7.6 27 20 25 1.4 26 60 4.2 28 40 3.0 28 27 40 2.9 54 244 161 31 45 3.8 29 30 50 4.1 32 35 3.0 25 18 1.2 30 23 35 2.2 17 20 .92 23 10 .62 31 --- --- --- 15 15 .61 --- --- --- TOTAL 1016 1745.08 710 818.98 852 609.61 87 RIO GRANDE DE ARECIBO BASIN 50028000 RIO TANAMA NEAR UTUADO, PR--Continued SEDIMENT DISCHARGE. SUSPENDED (TONS/DAY). WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 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 22 10 .59 16 18 .78 140 1080 2580 2 21 10 .57 16 18 .78 60 160 26 3 21 10 .57 27 35 2.6 45 100 12 4 20 10 .54 25 35 2.4 41 75 8.3 5 46 129 54 17 20 .92 39 60 6.3 6 27 40 2.9 17 18 .83 38 55 5.6 7 20 28 1.5 17 18 .83 40 55 5.9 8 19 24 1.2 17 18 .83 37 50 5.0 9 19 22 1.1 17 18 .83 42 50 5.7 10 19 20 1.0 18 18 .87 61 120 20 11 19 20 1.0 21 27 1.5 58 105 16 12 19 20 1.0 16 17 .73 67 160 29 13 24 35 2.3 15 15 .61 46 80 9.9 14 26 50 3.5 18 20 .97 40 65 7.0 15 18 20 .97 30 50 4.1 73 295 215 16 19 20 1.0 21 20 1.1 60 125 20 17 147 1140 3650 36 82 24 56 120 18 18 41 120 13 68 172 51 47 100 13 19 24 50 3.2 23 22 1.4 44 70 8.3 20 21 20 1.1 38 97 35 93 508 471 21 21 25 1.4 31 50 4.2 161 814 2200 22 22 30 1.8 25 35 2.4 107 419 355 23 19 25 1.3 29 60 4.7 213 1130 2510 24 18 22 1.1 403 3270 14600 119 363 163 25 20 22 1.2 265 1790 3370 104 302 144 26 18 21 1.0 105 295 95 189 1580 6440 27 18 21 1.0 98 376 183 98 350 93 28 20 20 1.1 84 256 93 70 200 38 29 31 61 13 55 110 16 60 130 21 30 19 22 1.1 46 80 9.9 52 100 14 31 17 20 .92 60 150 24 --- --- --- TOTAL 815 3765.96 1674 18534.28 2306 15460.0 YEAR 14470 64665.40 RIO GRANDE DE ARECIBO BASIN 88 50028400 RIO TANAMA AT CHARCO HONDO, PR LOCATION.--Lat 18°24'52', long 66°42'52", on right bank at abandoned power house at Charco Hondo, 1.5 mi (2.4 km) upstream from mouth, and 4 mi (6 km) south of Arecibo. DRAINAGE AREA.--57.6 mil (149.2 km 2). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--April 1969 to June 1971, October 1981 to current year. GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 60 ft (18 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. Diversion 0.8 mi (1.3 km) upstream for municipal supply of Arecibo. AVERAGE DISCHARGE.--8 years (1970,1982-88), 91.0 ft'is (2.578 m'/s), 21.45 in/yr (545 mm/yr), 65,930 acre-ft/yr (81.3 hm'/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 15,000 ft'/s (425 m'/s), May 18, 1985, gage height, 17.95 ft (5.471 m), from floodmark, from rating curve extended above 1,000 ft'/s (28.3 m'/s) on basis of step-backwater analysis: minimum discharge, 14 ft'/s (0.396 m'/s), Mar. 30, 31, 1987. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 2,000 ft3/s (56.6 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (03 /s) (ft) (m) Date Time (W/s) (03/s) (ft) (m) Nov. 27 1800 *2,830 80.2 *11.21 3.417 Aug. 24 2115 2,600 73.7 10.93 3.331 Minimum discharge, 8.7 ft'is (0.246 m'/s), Mar. 4. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 34 118 55 210 41 17 16 38 20 e38 e30 164 2 57 54 71 229 37 24 14 29 18 e37 e28 129 3 67 54 165 109 63 17 14 27 14 e36 e28 87 4 56 48 64 72 72 16 14 29 14 e35 e50 62 5 43 38 82 60 35 16 13 20 13 e34 e30 54 6 41 37 115 56 30 15 19 18 13 e77 25 52 7 114 64 83 51 25 15 13 17 21 e46 26 47 8 242 87 62 47 25 15 12 17 35 e34 33 56 9 163 58 53 44 25 14 11 51 39 e32 25 55 10 89 66 48 42 23 14 10 228 38 e32 22 89 11 124 37 46 41 22 14 11 280 41 e32 27 99 12 99 34 47 41 22 14 17 155 76 e32 22 85 13 68 37 43 39 22 13 23 92 e112 e32 20 76 14 163 33 41 49 24 14 13 85 e80 e41 19 61 15 228 37 43 72 21 14 21 100 e43 e44 25 70 16 132 46 44 39 20 13 76 62 e35 e30 29 88 17 78 84 40 44 19 14 38 41 e37 e32 23 57 18 65 55 38 40 19 14 91 32 e34 e250 83 57 19 75 40 128 39 17 12 93 26 e90 e86 36 47 20 60 33 164 36 17 12 207 23 e86 e70 26 146 e36 43 235 21 54 31 104 33 17 12 314 21 e74 22 84 29 64 31 17 12 222 20 e70 e36 29 158 23 74 29 53 30 17 11 122 26 e50 e37 29 259 24 85 74 49 28 18 12 58 27 e42 e33 366 148 56 116 69 29 18 11 49 20 e54 e31 703 130 25 26 46 53 50 27 19 11 49 19 e113 e34 178 202 27 40 391 45 27 30 16 49 61 e68 e31 134 182 28 38 214 43 27 21 47 46 43 e47 e31 134 172 29 49 83 41 33 18 45 70 57 e52 e35 122 112 30 87 64 41 33 --- 21 52 24 e42 e55 109 89 31 103 --- 103 28 19 --- 21 --- e35 82 --- 754 514 1757 1709 1471 1444 2536 3268 MEAN 87.5 71.5 67.5 54,4 26.0 16.6 TOTAL 2714 2144 2094 1686 58.6 55.1 49.0 46.6 81.8 109 MAX 242 391 165 229 72 47 314 280 113 250 703 259 MIN 34 29 38 27 17 10 17 13 11 30 19 47 1020 2860 6480 CFSM 1.52 1.24 1.17 .94 .45 .29 1.02 .96 .85 .81 1.42 1.89 IN. 1.75 1.38 1.35 1.09 .49 .33 1.13 1.10 .95 .93 1.64 2.11 AC-FT 5380 4250 4150 3340 1500 3490 3390 2920 5030 CAL YR 1987 TOTAL 21141 MEAN 57.9 MAX 478 MIN 14 AC-FT 41930 CFSM 1.01 IN. 13.65 WTR YR 1988 TOTAL 22091 MEAN 60.4 MAX 703 MIN 10 AC-FT 43820 CFSM 1.05 IN. 14.27 e Estimated 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 1987 TO SEPTEMBER 1988 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFIOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) OCT, 15 1238 226 242 24.5 APR, 14 1208 11.7 278 24.0 DEC, 16 1313 41.4 270 23.5 MAY, 10 1234 66.5 287 24.0 JAN, 20 1313 34.3 255 22.5 JUN, 02 1329 15.4 283 26.0 FEB, 22 1256 15.8 275 22.0 JUL, 06 1248 196 255 24.5 MAR, 14 1329 12.5 297 24.5 AUG, 05 1257 28.8 271 26.0 90 RIO GRANDE DE ARECIBO BASIN 50029000 RIO GRANDE DE ARECIBO AT CENTRAL CAMBALACHE, PR WATER-QUALITY RECORDS LOCATION.--Lat 18- 27'20", long 66 - 42'10", Hydrologic Unit 21010002, at bridge on unimproved road. about 500 ft (152 m) upstream from Central Cambalache, near Highway 2, 8.3 mi (13.4 km) downstream from Dos Bocas Reservoir, 1.9 mi (3.1 km) downstream from Rio Tanama , and 1.6 mi (2.6 km) southeast of Arecibo. DRAINAGE AREA.--200 mi' (520 km"), approximately. PERIOD OF RECORD.--Water years 1963-66, 1969 to current year. DIS- OXYGEN, OXYGEN COLT- STREP- CHARGE, SPE- DIS- DEMAND. FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL. FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1987 19... 1100 187 299 7.50 26.0 7.4 7.2 88 ,10 1100 540 DEC 18... 0945 202 224 7.00 24.0 12 7.9 93 33 K150 400 FEB 1988 22... 1500 122 265 7.40 26.0 9.5 116 220 K54 APR 25... 1035 155 282 7.20 25.5 12 8.3 99 <10 460 240 JUN 17... 1015 E200 298 6.90 27.0 4.0 8.3 102 <10 600 K140 AUG 23... 1015 167 272 6.80 26.5 2.0 7.8 95 13 480 200 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- UNITY CHLO- NESS NONCARB CALCIUM SLUM, SODIUM, AD- S1UM, WAT WH SULFATE RIDE. TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLO 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 1987 19... 140 14 49 5.3 7.9 0.3 1.7 130 <0.5 10 11 DEC 18... 84 FEB 1988 22... 98 APR 25... 130 13 41 5.6 7.9 0.3 1.7 100 <0.5 14 9.4 JUN 17... 110 AUG 23... 110 11 35 6.6 9.3 0.4 1.6 110 12 11 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1987 19... 0.10 15 178 90 7 0.69 0.01 0.70 0.04 0.16 DEC 18... 14 0.79 0.01 0.80 0.02 0.18 FEB 1988 22... 0.49 0.01 0.50 0.02 0.28 APR 25... 0.10 15 162 68 60 0.68 0.02 0.70 0.03 0.17 JUN 17... 6 0.39 0.01 0.40 0.01 0.59 AUG 23... 0.10 17 162 73 7 0.39 0.01 0.40 0.02 0.28 K = non-ideal count E = estimate RIO GRANDE DE ARECIBO BASIN 50029000 RIO GRANDE DE ARECIBO AT CENTRAL CAMBALACHE, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA • NITRO- NITRO- PHOS- NITRO- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1987 19... 0.2 0.9 4.0 0.05 -1 20C -10 ,1 5 <10 DEC 18... 0.2 0.03 - FEB 1988 22... 0.3 0.8 3.5 0.02 -- APR 25... 0.2 0.04 .1 <100 •10 1 ,1 10 JUN 17... 0.6 1.0 4.4 0.03 AUG 23... 0.3 0.7 3.1 0.03 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1987 19... 360 <5 40 <0.10 <1 <1 10 <0.010 3 0.01 DEC 18... FEB 1988 22... APR 25... 580 <5 50 <0.10 <1 <10 0.010 2 0.02 JUN 17... AUG 23... 91 92 THIS PAGE WAS LEFT BLANK INTENTIONALLY 93 BARCELONE TA • 205 Flot id° • Drainage boundary Rio Grande de Arecibo basin Island Rio Inaben basin OCEAN° ArLANTIco 0382 a roffuguero 207 VEGA BAJA I MANATI S • 209 • 2'38 VEGA ALTA a • 210 Drainage boundaries indeterminate in limestone termite 035950 Limestone Igneous and MOROVIS sedimentary rocks Cibuco basin Drainage boundary Ri'o de la Plato basin Canal de Aceitunas and torin to Rio Jacoguas EXPLANATION A3350 SURFACE—WATER STATION AND NUMBER V0307 uuALITY—OF—WATER STATION AND NUMBER 02 1 0 WELL AND WELL NUMBER 4 4 MILES II 6 KILOMETERS 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 mi' (26.2 km). PERIOD OF RECORD.--Water year 1979 to current year. DIS- OXYGEN, OXYGEN COLT- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1987 8... 0740 7.4 289 7.60 22.5 1.5 7.8 94 28 K890 2550 DEC 9... 1355 14 234 7.70 23.0 0.8 7.7 94 10 2900 FEB 1988 16... 1315 13 273 8.40 22.5 17 8.8 107 10 K960 330 APR 07... 1345 8.9 287 8.10 25.5 5.5 8.4 108 14 K770 330 JUN 02... 1150 5.9 332 7.50 26.5 1.7 8.2 104 33 590 320 AUG 18... 1120 11 245 7.10 24.0 36 8.0 98 21 53000 25000 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SLUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT 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 1987 08... 130 12 33 12 14 0.5 2.0 120 , 0.5 11 13 DEC 09... 89 FEB 1988 16... 100 APR 07... 130 7 31 12 13 0.5 1.5 110 ,0.5 9.2 14 JUN 02... - 120 AUG 18... 100 9 25 10 12 0.5 2.1 85 12 12 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED' PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1987 8... 0.20 32 189 3.8 7 0.89 0.01 0.90 0.01 0.29 DEC 9... 14 0.99 0.01 1.00 0.01 0.19 FEB 1988 16... 17 1.18 0.02 1.20 0.01 0.49 APR 07... 0.20 34 187 4.5 1 0.89 0.01 0.90 0.02 0.28 JUN 02... 6 1.19 0.01 1.20 0.03 0.17 AUG 18... 0.10 28 158 4.6 30 0.78 0.02 0.80 0.22 0.08 K = non-ideal count RIO GRANDE DE MANATI BASIN 50030700 RIO OROCOVIS NEAR OROCOVIS, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL IOTA! ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1987 8... 0.3 1.2 5.•3 0.13 <1 100 10 <1 2 <10 DEC 9... 0.2 1.2 5.3 0.21 FEB 1988 16... 0.5 1.7 6.2 0.17 APR 07... 0.3 1.2 5.3 0.21 1 <100 <10 <1 <1 <10 JUN 02... 0.2 1.4 4.7 0.22 AUG 18... 0.3 1.1 4.9 0.18 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 1987 8... 160 <5 20 <0.10 <1 <1 <10 <0.010 4 0.02 DEC 9... FEB 1988 16... APR 07... 200 <5 30 <0.10 <1 <1 <10 <0.010 <1 0.03 JUN 02... AUG 18... 95 I I I I RIO GRANDE DE MANATI BASIN 96 50031200 RIO GRANDE DE MANATI NEAR MOROV1S, PR LOCATION.--Lat 18°17'45", long 66°24'47", Hydrologic Unit 21010001, on right bank , 0.1 mi (0.2 km) downstream fro Quebrada Perchas, 0.8 mi (1.3 km) upstream fro Rio Sana Muerto, and 2.2 mi (3.5 km) south of Morovis. DRAINAGE AREA.--55.2 mil (143.0 km 2 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--January 1965 to current year. GAGE.--Water-stage recorder and concrete control. Elevation of gage is 440 ft (134 m), from topographic map. Feb. 2, 1966 to Apr. 27, 1967, staff gage read twice daily. REMARKS.--Records fair 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.--23 years (1966-88), 106 ft'/s (3.002 m'/s), 26.08 in/yr (662 mm/yr), 76,800 acre-ft/yr (94.7 hm3/yr); median of yearly mean discharges, 90 ft'is (2.55 m'/s), 65,200 acre-ft/yr (80 hm'/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 48,000 ft'is (1,359 m'/s), May 18, '985, gage height, 17.89 ft (5.453 m), fro floodmarks, from rating curve extended above 200 ft'is (5.66 m'/s) on basis of computations of flow over broad-crested weir and step-backwater analysis; minimum discharges, 4.4 ft'/s (0.125 m 3/s), Apr. 15, 1984. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 3,500 ft'/s (99.1 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (W/s) (m'/s) (ft) (m) Date Time (ft'/s) (10/s) (ft) (m) Nov.27 1445 *4,540 129 *5.73 1.747 Minimum discharge, 23 ft'/s (0.651 m'/s), Aug. 3. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 39 37 95 862 389 69 49 60 39 44 27 46 2 34 36 82 450 413 79 46 58 37 50 25 47 3 34 e34 73 208 444 65 44 55 38 46 36 41 4 69 e50 68 154 289 61 43 53 36 36 113 40 5 70 37 77 134 163 59 43 53 35 35 38 39 51 29 37 7 32 65 63 113 110 58 61 52 36 32 6 36 92 81 121 127 58 63 35 32 27 36 41 8 95 47 74 108 100 57 44 50 35 31 29 44 9 117 39 61 103 92 55 41 67 34 30 29 10 46 37 55 102 88 55 40 199 33 30 30 93 11 37 35 55 97 85 54 40 184 37 30 56 329 12 42 35 102 94 82 54 58 117 44 34 31 204 13 35 47 65 89 82 54 46 75 40 30 27 117 14 33 36 55 93 80 56 42 68 31 25 36 82 64 24 15 35 33 61 85 79 52 59 41 30 66 16 38 33 65 81 78 52 141 63 46 27 27 57 17 40 66 52 120 76 59 334 56 37 28 52 56 18 139 106 49 105 76 56 413 54 34 33 261 51 19 132 72 98 100 72 50 392 52 34 31 70 46 20 59 49 304 87 71 48 231 52 34 29 41 61 21 191 41 199 81 69 48 194 50 36 27 34 49 22 157 40 136 77 68 46 350 50 40 28 63 117 23 71 39 111 73 68 44 170 47 38 28 135 282 24 56 317 93 71 72 48 112 47 46 27 705 212 91 46 82 30 558 102 25 57 332 157 73 67 46 45 88 27 209 80 26 47 138 108 69 66 61 79 46 27 116 178 27 41 1020 97 66 149 56 72 44 28 41 435 87 77 87 65 67 42 39 28 81 72 29 42 175 78 141 73 71 66 42 37 31 63 88 30 48 119 70 92 --- 64 62 44 36 28 55 75 --- 27 49 --- 31 39 --- 308 98 63 --- 42 TOTAL 1952 3642 3079 4224 3715 1763 3493 1982 1229 977 3065 2788 MEAN 63.0 121 99.3 136 128 56.9 116 63.9 41.0 31.5 98.9 92.9 705 329 MAX 191 1020 308 862 444 79 413 199 88 50 27 24 36 MIN 32 33 49 66 66 44 40 42 33 AC-FT 3870 7220 6110 8380 7370 3500 6930 3930 2440 1940 6080 5530 CFSM 1.14 2.20 1.80 2.47 2.32 1.03 2.11 1.16 .74 .57 1.79 1.68 IN. 1.32 2.45 2.07 2.85 2.50 1.19 2.35 1.34 .83 2.07 .66 1.88 TOTAL 35756 MEAN 98.0 MAX 1310 MIN 23 AC-FT 70920 CFSM 1.77 IN. 24.10 WTR YR 1988 TOTAL 31909 MEAN 87.2 MAX 1020 MIN 24 AC-FT 63290 CFSM 1.58 IN. 21.50 e Estimated CAL YR 1987 97 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 1987 TO SEPTEMBER 1988 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1987 8... 1100 31 250 8.00 27.0 7.5 8.5 107 23 800 K120 DEC 9... 1110 61 245 7.60 24.0 6.7 8.3 99 15 K1000 K240 FEB 1988 16... 1050 78 260 7.80 23.0 71 8.4 99 ,10 K90 K170 APR 7... 1100 60 242 7.90 24.5 16 9.4 114 <10 K16000 K180 JUN 02... 0920 39 192 7.30 26.5 1.7 7.0 88 29 K80 K73 AUG 18... 0910 263 140 6.20 23.0 300 8.4 99 98 K93000 100000 HARD- HARD- NESS NESS NONCARB CALCIUM TOTAL WH WAT DIS- (MG/L 101 FLD SOLVED DATE AS MG/L AS (MG/L CAC03) CAC03 AS CA) OCT 1987 8... 100 3 24 DEC 9... FEB 1988 16... APR 07... 100 2 24 JUN 02... AUG 18... 56 16 13 MAGNE- SLUM, SODIUM. DIS- DIS- SOLVED SOLVED (MG/L (MG/L AS MG) AS NA) 10 12 10 12 5.8 9.6 ALKA- SODIUM POTAS- UNITY AD- SLUM. WAT WH SORP- DIS- TOT FET SULFIDE ZION SOLVED FIELD TOTAL RATIO (MG/L MG/L AS (MG/L AS K) CAC03 AS S) 0.5 2.0 98 <0.5 90 94 0.5 2.0 92 <0.5 94 0.6 3.5 36 CHLO- SULFATE RIDE, DIS- DIS- SOLVED SOLVED (MG/L (MG/L AS SO4) AS CL) 9.8 13 8.6 14 17 11 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1987 8... 0.20 29 159 13 17 0.59 0.01 0.60 0.07 0.13 DEC 9... <1 0.79 0.01 0.80 0.01 0.19 FEB 1988 16... 60 1.67 0.03 1.70 0.06 1.4 APR 07... 0.20 28 158 25 16 0.59 0.01 0.60 0.02 0.28 JUN 02... 5 0.39 0.01 0.40 0.02 1.4 AUG 18... 0.10 16 100 71 177 1.19 0.11 1.30 0.25 2.5 K = non-ideal count RIO GRANDE DE MANATI BASIN 50031200 RIO GRANDE DE MANATI NEAR MOROVIS, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTMBER 1988 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA • NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1987 8... 0.2 0.8 3.1 0.08 -I 100 <10 ,1 10 10 DEC 9... 0.2 1.0 4.2 0.06 - FEB 1988 16... 1.5 3.2 13.0 0.11 APR 07... 0.3 0.9 4.0 0.06 ,1 <100 <10 <1 <1 <10 JUN 02... 1.4 1.8 8.0 0.05 AUG 18... 2.7 4.0 18 0.48 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 1987 8... 860 <5 40 <0.10 1 <1 <10 <0.010 5 0.01 DEC 9... FEB 1988 16... APR 07... 1000 <5 40 <0.10 <1 <1 <10 <0.010 1 0.03 JUN 02... - AUG 18... 98 99 RIO GRANDE DE MANATI BASIN 50032290 LAGO EL GUINEO AT DAMSITE, PR LOCATION.--Lat 18°09'41", long 66°51'48", Hydrologic Unit 21010001, at damsite on Rio Toro Negro, 3.0 mi (4.8 km) northwest from Villalba plaza and 1.9 mi (3.1 km) northeast of Cerro Maravillas. The reservoir itself fixes the territorial limits between the Municipality of Ciales and Orocovis. DRAINAGE AREA.--1.64 mi' (4.248 km 1 ). ELEVATION RECORDS PERIOD OF RECORD.--May 1988 to September 1988. GAGE.--Water stage recorder and Data Collection Platform. Datum of gage is 2,900.00 ft (883.920 m) above mean sea level; gage readings has been adjusted to elevations above mean sea level. REMARKS.--Lago Guineo was completed in 1931. It provides a maximum storage of approximately 2,180 ac-ft (2.688 hoO) for power and irrigation. Waters are discharged through an outlet power tunnel into the Toro Negro river and coveyed to the head water works of Toro Negro Hydroelectric Plant No.2, for energy generation at Toro Negro Hydroelectric plant No.1, and are discharged into the Guayabal Reservoir to be later used for irrigation at South Coast Irrigation System. The dam is rockfill with a vertical concrete corewall, rock toes, and riprap facing of upstream slope, with a total length of 565 ft (172 m), a maximum structural height of 125 ft (38.1 m) to top of corewall. The uncontrolled morning-glory tunnel spillway crest has an elevation of 2,966 ft (904.03 m) above mean sea level and a design capacity of 7,000 ft'/s. The dam is owned by Puerto Rico Electric Power Authority. EXTREMES OBSERVED FOR CURRENT PERIOD.--Maximum elevation, 2,943.67 ft (897.23 m), Aug. 26; minimun elevation, 2,919.79 ft (899.95 m). May 27. Capacity Table (based on data from Puerto Rico Electric Power Authority) Elevation, in feet Contents, in acre-feet Elevation, in feet Contents, in acre-feet 2,872 0 2,943 1,029 2,919 361 2,950 1,308 2,925 491 2,960 1,798 ELEVATION (FEET NGVD), WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 OBSERVATION AT 24:00 VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 2927.52 2927.00 2926.51 2942.37 2 2926.81 2921.34 2926.60 2941.78 3 2926.15 2927.53 2926.97 2942.05 4 2924.87 2927.84 2927.11 2942.28 5 2924.99 2928.06 2927.20 2941.38 6 2924.45 2927.79 2927.28 2940.56 7 2923.83 2926.84 2927.37 2939.75 8 2923.54 2926.99 2926.76 2939.09 9 2923.46 2927.12 2926.85 2938.35 10 2922.98 2925.94 2927.71 2937.85 11 --- 2923.26 2926.07 2927.83 2939.13 12 --- 2925.64 2926.19 2927.92 2940.11 13 --- 2925.33 2926.20 2928.01 2939.72 14 2933.32 2923.96 2926.44 2928.38 2939.55 15 2933.38 2923.93 2926.55 2928.53 2939.05 16 2932.88 2923.98 2926:76 2928.21 2938.60 17 2932.23 2924.10 2926.91 2929.08 2938.92 18 2931.73 2924.22 2927.03 2930.02 2939.17 19 2931.53 2924.34 2927.14 2930.16 2938.72 20 2931.02 2924.56 2927.25 2930.28 2938.20 21 2931.12 2924.76 2927.35 2930.38 2937.78 22 2931.20 2925.11 2927.02 2931.37 2938.09 23 2930.49 2925.43 2927.12 2930.48 2938.19 24 2929.85 2925.83 2927.25 2942.43 2939.30 25 2929.06 2926.01 2927.35 2943.52 2939.69 26 2928.41 2926.23 2927.46 2943.07 2939.80 27 2927.85 2926.42 2927.56 2942.12 2938.94 28 2927.95 2926.57 2927.35 2942.43 2939.23 29 2928.03 2926.69 2927.44 2941.51 2939.50 30 2928.16 2926.48 2927.60 2940.64 2940.13 31 2927.59 --- 2926.93 2942.48 TOTAL --- 87751.45 90739.42 90889.21 88187.28 MEAN --- 2925.05 2927.08 2931.91 2939.58 MAX --- 2927.52 2928.06 2943.52 2942.37 WTR YR 1988 TOTAL 410313.16 MEAN 2930.81 MAX 2943.52 100 RIO GRANDE DE MANATI BASIN 50032590 LAGO DE MATRULLAS AT DAMSITE, FR LOCATION.--Lat 18°12'46", Long 66°28'50", Hydrologic Unit 21010001, in concrete house at damsite, and 5.80 mi (9.28 km) southwest of the town of Orocovis. DRAINAGE AREA.--4.46 xi' (11.55 km 2 ). ELEVATION RECORDS PERIOD OF RECORD.--May 1988 to September 1988. GAGE.--Water-stage recorder. Datum of gage is 2,355.95 ft (718.1 m) above National Geodetic Vertical Datum of 1929; gage readings has been adjusted to elevations above mean sea level. REMARKS.--Lago Matrullas was completed in 1934. The dam is an earthfill structure about 120 ft. hight, a top width of 30 ft. and a length of 710 ft., and has a maximum storage capacity of about 4,274 ac-ft. at top of dam elevation. The Matrullas Dam is owned by the Puerto Rico Electric Power Authority and is part of the of the Toro Negro Hydro­ electric Project; a project developed by the P.R.E.P.A. for the primary purpose of generating electric power. Discharges from the Power Plants are collected by the Jacaguas River which flows into Guayabal Dam, at which dam they are regulated for irrigatin of lands served by the Juana Diaz Canal. EXTREMES OBSERVED FOR CURRENT PERIOD.--Maximum elevation, 2,404.98 ft (733.0 m), Aug. 26; minimun elevation 2,399.00 ft (731.2 m), Aug. 20. Capacity Table (based on data from Puerto Rico Electric Power Authority) Elevation, in feet Contents, in acre-feet Elevation, in feet Contents, in acre-feet 2,338 2 2,399 1,845 2,360 302 2,415 2,945 ELEVATION (FEET NGVD), WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 OBSERVATION AT 24:00 VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 2403.36 2402.02 2400.58 2404.10 2 2403.22 2402.15 2400.43 2404.09 3 2403.06 2402.30 2400.32 2404.18 4 2402.76 2402.31 2400.28 2404.30 5 2402.71 2402.25 2400.17 2404.02 6 2402.69 2402.17 2400.20 2403.62 7 2402.58 2401.96 2400.31 2403.23 8 2402.45 2401.80 2400.15 2402.89 9 2402.36 2401.84 2399.89 2402.48 10 2402.29 2401.93 2399.61 2402.35 11 --- 2402.43 2401.87 2399.43 2402.82 12 --- 2402.63 2401.77 2399.31 2402.84 13 2404.15 2402.57 2401.62 2399.34 2402.58 14 2404.16 2402.35 2401.49 2399.41 2402.27 15 2404.29 2402.06 2401.38 2399.32 2401.96 16 2404.21 2401.72 2401.41 2399.16 2401.60 17 2404.08 2401.34 2401.49 2399.03 2401.72 18 2404.01 2401.29 2401.48 2399.12 2401.99 19 2403.92 2401.37 2401.40 2399.01 2401.77 20 2403.81 2401.32 2401.28 2399.04 2401.41 21 2403.88 2401.33 2401.16 2399.11 2401.65 22 2403.98 2401.30 2401.01 2399.16 2402.03 23 2403.90 2401.26 2401.04 2399.17 2401.90 24 2403.78 2401.33 2401.12 2402.29 2402.07 25 2403.62 2401.62 2401.09 2404.86 2402.34 26 2403.46 2402.15 2401.00 2404.79 2402.94 27 2403.29 2402.31 2400.92 2404.48 2404.06 28 2403.34 2402.28 2400.82 2404.52 2404.36 29 2403.49 2402.21 2400.73 2404.40 2404.36 30 2403.49 2402.13 2400.79 2404.18 2404.83 31 2403.43 2400.77 2403.91 TOTAL MEAN MAX MIN 72064.48 74446.37 74424.98 72086.76 2402.15 2401.50 2400.81 2402.89 2403.36 2402.31 2404.86 2404.83 2401.26 2400.73 2399.01 2401.41 WTR YR 1988 TOTAL 338694.88 MEAN 2402.09 MAX 2404.86 MIN 2399.01 I I 101 RIO GRANDE DE MANATI BASIN 50035000 RIO GRANDE DE MANATI AT CIALES, PR LOCATION.--Lat 18°19'26", long 66°27'36', Hydrologic Unit 21010001. on left bank. 1.6 mi (2.6 km) upstream from Hwy 145 bridge, 0.8 mi (1.3 km) downstream from Quebrada Saliente, 0.9 mi (1.4 km) upstream from Quebrada Cojo Vales, and 1.2 mi (1.9 km) southeast of Ciales. DRAINAGE AREA.--128 mi' (332 km 2 ), 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 September 1960 (monthly discharge measurements only); October 1960 to current year. Equivalent record fro January 1971 to December 1972 published as 50035200 Rio Grande de Manati at Highway 145 at Ciales at site 1.6 mi (2.6 km) downstream, drainage area 132 mil (342 km 2 ). GAGE.--Water-stage recorder. Elevation of gage is 140 ft (43 m), from topographic map. Prior to Apr. 1, 1962 , staff gage, read twice daily, at site 100 ft (30 m) upstream at same datum. January 1971 to December 1972 at site 1.6 mi (2.6 km) downstream at different datum. REMARKS.--Records fair except those for estimated daily dischages, which are poor. AVERAGE DISCHARGE.--28 years (1961-88), 225 ft'/s (6.372 m'/s), 28.01 in/yr (711 mm/yr), 191,300 acre-ft/yr (236 he/yr); median of yearly mean discharges, 239 ft'/s (6.77 '/s), 173,000 acre-ft/yr (214 hm7yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 125,000 ft'is (3,540 m 3 /s), Oct. 9, 1970, gage height, 24.0 ft (7.32 m), from floodmark, from rating curve extended above 3,000 ft'is (85.0 m'/s) on basis of slope-area measurements of peak flow at gage heights 13.2 ft (4.02 m), 15.0 ft (4.57 m), 19.0 ft (5.79 m), and 24.0 ft (7.32 m), datum then in use; minimum discharge, 20 ft'is (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'/s (198 10/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (W/s) (m 3/s) (ft) (m) Date Time (ft'/s) (20/s) (ft) (m) Nov. 27 1500 *36,400 1,030 *14.13 4.307 Aug.24 2000 9,310 264 7.53 2.295 May 10 1715 8,500 241 7.22 2.201 Minimum discharge, 29 ft'is (0.82 10/s), Aug. 21. 102 RIO GRANDE DE MANATI BASIN 50035000 RIO GRANDE DE MANATI AT CIALES, PR--Continued DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 2 3 4 5 99 103 116 304 298 119 112 102 120 106 269 228 201 178 202 2770 1490 477 337 290 715 885 1050 763 367 141 172 137 126 120 98 90 89 88 87 el20 e110 e100 e96 e92 83 79 73 70 67 72 82 84 70 66 68 67 78 183 80 151 173 110 97 89 6 7 8 9 10 128 144 620 497 196 287 175 162 135 116 280 220 224 191 169 272 247 226 210 213 280 235 207 198 187 115 114 111 108 106 101 95 86 83 81 93 103 113 197 1220 67 76 84 71 67 84 66 64 64 63 62 55 56 56 55 85 82 95 92 144 11 12 13 14 15 431 384 173 150 158 104 103 221 126 112 193 335 208 178 175 201 194 186 192 179 180 176 177 177 167 106 104 102 105 103 80 118 93 81 140 888 387 192 190 179 71 117 90 74 71 63 64 63 65 67 72 55 48 45 42 457 301 193 141 129 16 17 18 19 20 133 130 258 395 200 103 150 204 156 122 176 141 134 210 572 172 228 220 209 199 162 153 161 149 147 100 105 110 98 95 275 911 927 948 499 157 134 126 119 119 73 69 66 63 65 61 61 66 66 64 46 67 381 76 44 111 105 107 95 166 21 22 23 24 25 679 546 244 198 164 109 104 101 597 993 420 281 244 223 323 189 180 169 160 159 142 138 136 142 140 95 93 91 95 93 387 516 269 175 151 100 104 107 106 95 74 69 70 190 318 64 64 63 61 66 36 43 120 2150 1540 120 455 678 338 210 26 27 28 29 30 31 143 140 133 309 180 136 322 6840 1740 552 361 --- 240 220 208 188 170 707 157 155 160 248 221 188 135 284 179 144 --- 108 106 115 121 118 112 134 128 e130 e160 e180 --- 97 87 76 77 80 77 242 144 91 77 68 --- 65 65 68 75 71 68 325 176 130 114 105 94 331 477 183 201 234 --- TOTAL MEAN MAX MIN AC-FT CFSM IN. 7789 251 679 99 15450 1.96 2.26 14554 485 6840 101 28870 3.79 4.23 7708 249 707 134 15290 1.94 2.24 10498 339 2770 155 20820 2.65 3.05 7976 275 1050 135 15820 2.15 2.32 3425 110 172 91 6790 .86 1.00 7200 240 948 80 14280 1.87 2.09 5741 185 1220 76 11390 1.45 1.67 2839 94.6 318 63 5630 .74 .83 2085 67.3 84 61 4140 .53 .61 6469 209 2150 36 12830 1.63 1.88 6150 205 678 82 12200 1.60 1.79 CAL YR 1987 WTR YR 1988 TOTAL 100995 MEAN. 277 MAX 6840 MIN 43 AC-FT 200300 CFSM 2.16 IN. 29.35 TOTAL 82434 MEAN 225 MAX 6840 MIN 36 AC-FT 163500 CFSM 1.76 IN. 23.96 e Estimated WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS 1979 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 DATE TIME STREAMFLOW, INSTANTANEOUS (CFS) SPECIFIC CON- DUCTANCE (UMHOS) TEMPERA- TURE (DEG C) DATE TIME STREAMFLOW, INSTANTANEOUS (CFS) SPECIFIC CON- DUCTANCE (UMHOS) TEMPERA- TURE (DEG C) OCT, 09 1152 DEC, 17 1433 JAN, 19 1048 FEB, 18 1034 MAR, 15 1026 423.5 141.4 208.8 146 112 150 210 213 235 287 26.5 26.5 23.0 23.0 24.0 APR, 08 1046 MAY, 06 0931 JUL, 05 1028 AUG, 04 1052 84.7 90.4 64.1 253 240 108 238 230 26.0 26.5 28.5 27.5 103 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 mi , (352 km') this excludes the 6 mi' (15.5 km') upstream from Lago El Guineo and Lago de Matrullas, flow from which is diverted to Rio Jacaguas. PERIOD OF RECORD.--Water years 1979 to current year. DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCC1 INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1987 22... 0930 E350 135 7.80 25.0 220 8.0 96 14 41000 79000 DEC 22... 0830 170 229 6.90 23.5 13 8.1 94 <10 480 590 FEB 1988 19... 0930 135 253 7.20 23.5 8.3 98 250 380 APR 20... 0920 E1700 158 7.60 24.0 390 7.7 91 31 22000 59000 JUN 23... 0840 52 247 7.80 26.5 1.6 8.1 100 <10 200 K140 AUG 10... 0900 79 262 8.0 25.5 4.8 7.5 91 <10 K180 K1700 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SLUM, SODIUM, AD- S1UM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- D1S- (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 1987 22... 53 5 13 4.9 8.5 0.5 2.8 48 <0.5 14 5.9 DEC 22... 70 FEB 1988 19... 96 APR 20... 53 9 13 5.1 8.3 0.5 1.9 48 0.8 17 10 JUN 23... 92 AUG 10... 95 1 23 9.1 14 0.6 2.3 90 11 13 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE 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) 5102) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1987 22... 0.10 20 98 351 0.74 0.06 0.80 0.14 0.4 6 DEC 22... 5 0.88 0.02 0.90 0.02 0.18 FEB 1988 19... <10 0.49 0.01 0.50 0.03 0.17 APR 20... 0.10 20 102 535 0.95 0.05 1.00 0.12 0.48 JUN 23... 5 0.29 0.01 0.30 0.03 0.37 AUG 10... 0.10 29 158 34 10 0.19 0.01 0.20 0.01 0.19 K = non-ideal count E . estimate 104 RIO GRANDE DE MANATI BASIN 50035500 RIO GRANDE DE MANATI AT HIGHWAY 149 AT CIALES, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA . NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEM, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1987 22... 0.6 1.4 6.2 0.12 ,1 100 <10 4 <1 80 DEC 22... 0.2 1.1 4.9 0.07 FEB 1988 19... 0.2 0.7 3.1 0.06 APR 20... 0.6 1.6 7.1 0.10 <1 200 <10 27 65 110 JUN 23... 0.4 0.7 3.1 0.07 AUG 10... 0.2 0.4 1.8 0.07 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1987 22... 14000 <5 540 0.10 8 <1 100 <0.010 2 0.02 DEC 22... FEB 1988 19... APR 20... 3700 23 770 0.10 <1 <1 100 <0.010 <1 0.02 JUN 23... AUG 10... - RIO GRANDE DE MANATI BASIN 50035950 RIO CIALITOS AT HIGHWAY 649 AT CIALES, PR WATER-QUALITY PECORDS LOCATION.--Lat 18°20'18", long 66'28'28", 100 ft (30 m) upstream from bridge on Highway 649, 0.7 mi (1.1 km) upstream from mouth, and about 0.4 mi (0.6 km) west of Ciales plaza. DRAINAGE AREA.--17.0 mil (44.0 km 2 ). PERIOD OF RECORD.--Water years 1969-71, 1974 to current year. DIS- OXYGEN, OXYGEN COL1- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1987 22... 1150 40 185 8.20 25.0 44 7.0 84 <10 K18000 27000 DEC 22... 1120 33 216 6.80 23.0 0.4 8.7 102 <10 460 2200 FEB 1988 19... 1130 24 228 7.30 22.0 9.2 104 K630 K1800 APR 20... 1110 65 204 8.0 24.0 18 8.2 97 <10 K910 4300 JUN 23... 1140 14 248 8.3 25.5 2.3 8.6 104 <10 K900 K1300 AUG 10... 1105 9.0 252 8.2 26.5 3.0 8.7 108 <10 K7000 820 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SLUM, SODIUM. AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1987 22... 71 4 21 4.6 8.8 0.5 2.5 67 <0.5 13 7.4 DEC 22... 90 - FEB 1988 19... 95 APR 20... 81 8 25 4.6 8.6 0.4 1.6 75 <0.5 13 11 JUN 23... 98 AUG 10... 100 0 29 7.6 13 0.6 1.6 100 7.6 11 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEM, 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 1987 22... 0.10 22 120 13 40 1.18 0.02 1.20 0.04 0.16 DEC 22... 4 0.98 0.02 1.00 0.02 FEB 1988 19... - <0.01 0.60 0.02 0.18 APR 20... 0.10 22 130 23 <1 1.48 0.02 1.50 0.04 JUN 23... 24 <0.01 0.70 0.02 AUG 10... 0.10 31 164 4.0 4 - <0.01 0.50 0.01 0.19 K = non-ideal count 105 RIO GRANDE DE MANATI BASIN 50035950 RIO CIALITOS AT HIGHWAY 649 AT CIALES, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA • NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1987 22... 0.2 1.4 6.2 0.09 -1 <100 -10 -1 3 10 DEC 22... .0.2 0.10 - FEB 1988 19... 0.2 0.8 3.5 0.07 - - APR 20... <0.2 0.09 ,1 <100 <10 1 -1 <10 JUN 23... <0.2 0.08 AUG 10... 0.2 0.7 3.1 0.08 -- 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 1987 22... 1900 <5 70 <0.10 2 <1 20 -0.010 5 0.02 DEC 22... - FEB 1988 19... - APR 20... 940 <5 40 <0.10 •-1 1 <10 <0.010 <1 0.02 JUN 23... AUG 10... 106 107 RIO GRANDE DE MANATI BASIN 50038100 RIO GRANDE DE MANATI AT HIGHWAY 2 NEAR MANATI, PR LOCATION.--Lat 18°25'52", long 66°31'37". Hydrologic Unit 21010002, at bridge on Highway 2, and 2.3 mi (3.7 km) west of Manati. DRAINAGE AREA.--197 mi' (510 km'), approximately, of which about 38 mi' (98 km') is partly or entirely noncontributing, excludes 6.0 mi' (15.5 km 2 ) 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 and datum 3.57 ft (1.088 m) lower. REMARKS.--Records fair. AVERAGE DISCHARGE.--18 years (1971-88), 394 ft'/s (11.16 m'/s), 27.16 in/yr (690 mm/yr), 285,500 acre-ft/yr (352 hm'/yr); median of yearly mean discharges, 370 ft'/s (10.5 m'/s), 268,000 acre-ft/yr (330 hm'/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge. 97,200 ft'/s (2,750 m'/s), Oct. 7, 1985, gage height, 33.79 ft (10.299 m) from rating curve extended above 15,000 ft'/s (425 m'/s) on basis of slope-area measurements of peak flow; minimum discharge, 33 ft'/s (0.935 10/s), May 12, 1984. EXTREMES OUTSIDE PERIOD OF RECORD.--Approximate gage heights to gage datum of major floods, pointed out by local residents, are as follows: Sept. 13, 1928, 36.6 ft (11.16 m), Sept. 27, 1932, 36.3 ft (11.06 a), and Aug. 4, 1945, 34.3 ft (10.45 m). EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 9,000 ft'/s (255 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (W/s) (03 /s) (ft) (m) Date Time (ft'/s) (10/s) (ft) (m) Nov. 27 2030 *43,000 1,218 *31.75 9.677 Aug. 25 0145 16,500 467 29.10 8.870 May 10 2315 13,300 377 28.60 8.717 Minimum discharge, 90 ft'/s (2.549 m'/s), Aug. 15, 16. 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 (ft'/s) (0/s) (ft) (m) Year Date (ft'/s) (10/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 10.2 108 RIO GRANDE DE MANATI BASIN 50038100 RIO GRANDE DE MANATI AT HIGHWAY 2 NEAR MANATI, PR--Continued DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 2 3 4 5 139 133 165 172 546 193 177 165 169 164 591 490 436 385 366 3160 3670 967 632 502 1000 1510 1670 1610 761 203 238 210 191 183 158 145 138 135 133 211 136 177 166 161 136 131 130 128 127 146 155 157 133 119 100 95 100 261 159 241 316 220 180 160 6 7 8 9 10 221 168 385 1060 345 291 280 292 210 183 558 434 424 377 343 436 399 355 326 309 526 408 338 306 282 179 176 114 172 169 150 149 140 129 126 164 153 149 272 2120 124 127 140 130 122 144 119 110 104 103 112 100 98 103 103 149 143 149 170 221 11 12 13 14 15 235 689 283 215 236 166 156 270 217 167 353 503 424 351 339 294 281 269 275 259 270 262 256 251 243 166 164 164 168 164 127 144 193 135 246 2910 877 444 346 330 125 188 159 141 137 100 102 101 101 107 117 118 100 95 92 572 641 353 259 221 16 17 18 19 20 200 196 212 532 337 153 198 340 273 203 353 303 282 350 936 245 271 330 275 262 237 222 222 212 208 175 161 174 161 151 356 792 1890 1650 1400 280 234 208 196 188 162 137 119 115 113 96 94 108 106 100 97 128 504 249 143 200 186 179 162 194 21 22 23 24 25 357 1080 393 313 254 172 160 154 257 1540 825 508 406 343 461 244 231 226 217 213 204 201 201 205 205 148 143 140 148 147 786 768 558 331 277 176 170 159 154 148 124 134 130 194 360 96 98 96 92 99 114 110 207 1800 5570 297 283 1130 773 402 26 27 28 29 30 31 222 202 207 276 387 235 490 10500 6380 1100 751 --- 372 335 308 292 265 652 204 197 197 252 326 238 197 345 299 222 --- 160 166 186 188 190 178 234 211 215 265 317 --- 145 143 140 142 143 142 520 290 200 233 166 --- 100 97 95 119 111 102 904 428 303 246 219 189 280 1040 467 298 359 --- TOTAL MEAN MAX MIN AC-FT CFSM IN. 10395 335 1080 133 20620 1.70 1.96 25771 859 10500 153 51120 4.36 4.87 13365 431 936 265 26510 2.19 2.52 16062 518 3670 197 31860 2.63 3.03 12873 444 1670 197 25530 2.25 2.43 5337 172 238 140 10590 .87 1.01 12298 410 1890 126 24390 2.08 2.32 11434 369 2910 140 22680 1.87 2.16 5042 168 520 113 10000 .85 .95 3410 110 157 92 6760 .56 .64 12964 418 5570 92 25710 2.12 2.45 10245 341 1130 143 20320 1.73 1.93 CAL YR 1987 WTR YR 1988 TOTAL 163394 MEAN 448 MAX 13900 MIN 90 AC-FT 324100 CFSM 2.27 IN. 30.85 TOTAL 139196 MEAN 380 MAX 10500 MIN 92 AC-FT 276100 CFSM 1.93 IN. 26.28 109 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 RECORDS PERIOD OF RECORD.--Water years 1969 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1981 TO SEPTEMBER 1988 DIS- OXYGEN, COLT- STREP- CHARGE, SPE- DIS- FORM, TOCOCCI HARD- INST. CIF1C SOLVED FECAL, FECAL, NESS CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- 0.7 KF AGAR TOTAL FEET DUCT- (STAND- ATURE BID- DIS- CENT UM-MF (COLS. (MG/L DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- (COLS./ PER AS SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) 100 ML) 100 ML) CAC03) SEP 1987 28... 1105 127 299 7.70 29.0 5.8 7.1 130 K8700 6700 140 DEC 08... 1130 452 235 6.90 25.0 17 7.7 92 5700 100 FEB 1988 01... 1140 1560 224 7.00 24.0 53 8.1 94 20000 20000 98 APR 04... 1145 1070 312 7.10 25.5 3.6 7.9 96 K1400 640 140 JUN 01... 0915 137 355 6.90 27.0 10 7.0 86 24000 9100 150 AUG 01... 0925 99 309 6.80 27.0 6.3 6.9 85 K11000 2200 140 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- FLUO- SILICA, NONCARB CALCIUM SLUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, RIDE, DIS- WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET DIS- DIS- DIS- SOLVED TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD SOLVED SOLVED SOLVED (MG/L DATE MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L AS CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS 504) AS CL) AS F) SI02) SEP 1987 28... 9 43 8.0 11 0.4 7.5 130 9.0 11 0.1 21 DEC 08... 5 31 6.5 9.1 0.4 2.0 93 8.6 11 0.3 21 FEB 1988 01... 7 27 7.4 13 0.6 2.4 81 11 16 0.2 24 APR 04... 7 42 8.2 12 0.5 1.5 120 9.6 12 0.2 22 JUN 01... 8 47 8.3 12 0.4 2.2 140 10 13 0.3 22 AUG 01... 4 44 7.9 12 0.5 1.6 130 8.9 14 0.2 20 SOLIDS, SOLIDS, NITRO- NITRO- NITRO- NITRO- PHOS- PHOS- RESIDUE SUM OF SOLIDS, GEN, GEN, GEN, GEN,AM- PHOS- PHOROUS PHATE, AT 180 CONSTI- DIS- NO2+NO3 AMMONIA AMMONIA MONIA + PHOS- PHOROUS ORTHO, ORTHO, DEG. C TUENTS, SOLVED DIS- DIS- DIS- ORGANIC PHOROUS DIS- DIS- D1S- DI5- 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) SEP 1987 28... 184 193 66 0.73 0.05 0.06 0.5 0.10 0.01 0.05 0.15 DEC 08... 145 153 187 0.86 0.04 0.05 0.2 0.09 0.05 0.06 0.18 FEB 1988 01... 157 160 637 0.89 0.09 0.12 0.3 0.17 0.08 0.06 0.18 APR 04... 190 190 551 0.81 0.04 0.05 0.4 0.07 0.07 0.05 0.15 JUN 01... 220 205 74 0.68 0.09 0.12 0.5 0.18 0.14 0.12 0.37 AUG 01... 199 194 52 0.38 0.07 0.09 0.6 0.12 0.09 0.07 0.21 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 1987 TO SEPTEMBER 1988 ALUM- BERYL- CHRO- INUM, ARSENIC BARIUM, LIUM, CADMIUM MIUM, COBALT, COPPER, IRON, LEAD, DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS AL) AS AS) AS BA) AS BE) AS CD) AS CR) AS CO) AS CU) AS FE) AS PB) SEP 1987 28... 10 <1 43 <0.5 <1 <1 <3 3 12 <5 DEC 08... FEB 1988 01... 40 <1 38 <0.5 2 <1 <3 4 41 <5 APR 04... JUN 01... 20 2 48 <0.5 <1 <1 <3 2 9 <5 AUG 01... 50 1 48 <0.5 <1 <1 <3 4 21 5 MANGA- MOLYB- SELF- STROH- VANA- LITHIUM NESE, MERCURY DENUM, NICKEL, NIUM, SILVER, TIUM, DIUM, ZINC, D1S- 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) SEP 1987 28... <4 24 <0.1 <10 3 <1 <1 190 6 14 DEC 08... -- FEB 1988 01... <4 13 0.2 <10 3 <1 <1 130 7 21 APR 04... JUN 01... 9 39 <0.1 <10 2 <1 <1.0 200 7 28 AUG 01... <4 41 <0.1 <10 5 <1 <1.0 210 7 4 PESTICIDE ANALYSES CHLOR- DI- DI- ENDO- PCB, ALDRIN, DANE, DDD, DDE, DDT, AZINON, ELDRIN SULFAN, DATE TIME TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN 1988 01... 0915 <0.1 <0.01 <0.1 <0.01 <0.01 <0.01 0.13 <0.01 <0.01 HEPTA- METH- METHYL METHYL HEPTA- CHLOR MALA- OXY- PARA- TRI- ENDRIN, ETHION, CHLOR, EPDXIDE LINDANE THION, CHLOR, THION, THION, MIREX, DATE TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN 1988 01... <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 -0.01 <0.01 <0.01 <0.01 NAPH- THA- LENES, PARA- POLY- PER- TOX- TOTAL THION, CHLOR. THANE APHENE, TRI- 2,4-D, 2,4,5-T 2, 4-DP SILVEX, DATE TOTAL TOTAL TOTAL TOTAL THION TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN 1988 01... <0.01 <0.1 <0.1 <1 <0.01 <0.01 <0.01 <0.01 <0.01 110 RIO GRANDE DE MANATI BASIN 50038100 RIO GRANDE DE MANATI AT HIGHWAY 2 NEAR MANATI, FR--continued (National stream-quality accounting network station) WATER-QUALITY DATA. WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 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 1987 08... 1120 452 152 153 82 FEB 1988 01... 1155 1560 411 1730 73 APR 04... 1145 1070 77 223 69 JUN 01... 0910 137 71 26 84 AUG 01... 0915 99 B7 23 85 111 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 1987 TO SEPTEMBER 1988 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- D1S- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER SOLVED SATUR- LEVEL) (CQLS./ PER SECOND (US/CM) UNITS) (DEG C) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1987 6... 1145 23 1130 7.80 30.5 8.3 110 52 20 70 DEC 7... 1300 23 1140 7.70 28.5 7.0 90 22 K17 52 FEB 1988 8... 1345 26 1160 7.80 26.5 8.1 100 49 K8 120 APR 06... 1340 17 1260 7.80 28.5 7.9 101 24 K4 K25 JUN 13... 1435 28 1140 7.40 31.0 7.5 100 44 K15 48 AUG 9... 0850 18 1200 8.00 29.0 7.0 90 13 K10 K30 ALKA- RESIDUE NITRO- LINITY TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- GEN,AM- WAT WH AT 105 GEN, GEN, GEN, GEN, GEN, MONIA +. NITRO- TOT FET SULFIDE DEG. C, NITRATE NITRITE NO2.0103 AMMONIA ORGANIC ORGANIC GEN, FIELD TOTAL SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL DATE MG/L AS (MG/L PENDED (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L CAC03 AS S) (MG/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) OCT 1987 6... 130 <0.5 5 0.68 0.02 0.70 0.13 0.97 1.1 1.8 DEC 7... 120 4 0.70 0.10 0.80 0.12 0.38 0.5 1.3 FEB 1988 8... 130 3 0.98 0.02 1.00 0.08 0.62 0.7 1.7 APR 06... 110 <0.5 <1 0.68 0.02 0.70 0.13 0.77 0.9 1.6 JUN 13... 120 <1 0.68 0.02 0.70 0.10 0.70 0.8 1.5 AUG 9... 110 4 0.49 0.01 0.50 0.14 1.20 1.3 1.8 MANGA- METHY- BORON, COPPER, IRON, NESE, ZINC, LENE NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL BLUE GEN, PHOROUS RECOV- RECOV- RECOV- RECOV- RECOV- CYANIDE ACTIVE TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE TOTAL PHENOLS SUB- DATE (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L• (UG/L (MG/L TOTAL STANCE AS NO3) AS P) AS B) AS CU) AS FE) AS MN) AS ZN) AS CN) (UG/L) (MG/L) OCT 1987 6... 7.8 0.01 60 10 60 <10 <10 <0.01 3 0.05 DEC 7... 5.8 0.01 FEB 1988 8... 7.5 0.01 APR 06... 7.1 <0.01 40 <10 40 <10 <10 <0.01 6 0.1 JUN 13... 6.6 0.01 AUG 9... 8.0 0.02 K = non-ideal count 112 113 0982 DORADO,. Loguno ror uguero 0396 VEGA BAJAs, TOA BAJA • 70 a MANAT1 a • 212 VE GA AL TA si .213 Droinoge boundaries indeterminate TOA ALTA in limestone terrone a Limestone Igneous and sedimentary racks C;ALES ta NARANJITO a c14 00:0 Pletto bosin Drainage boundar y EXPLANATION A)38320 SURFACE—WATER STATION AND NUMBER p397 QUALITY—OF—WATER STATION AND NUMBER 0213 WELL AND WELL NUMBER p area 1£ Figure 15.--Rio Cibuco basin. RIO CIBUCO BASIN 114 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 mil (39.1 km?). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--May 1969 to current year. GAGE.--Water-stage recorder. Elevation of gage is 195 ft (59 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. AVERAGE DISCHARGE.--19 years (1970-88), 30.2 ft'/s (0.855 m'/s), 27.16 in/yr (690 mm/yr), 21,880 acre-ft/yr (27.0 hm'/yr); median of yearly mean discharges. 34 ft'/s (0.96 m'/s), 24,600 acre-ft/yr (30 ho0/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 13,600 ft'/s (385 m'/s), Nov. 7, 1979, gage height, 19.80 ft (6.035 m), from rating curve extended above 100 ft'/s (2.83 m'/s) on basis of float and slope-area measurements of peak flow; minimum daily discharge, 1.3 ftl/s (0.037 m'/s), July 24-26, 1977. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 2,500 ft'is (70.8 10/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (110/s) (ft) (m) Date Time (W/s) (01 /s) (ft) (m) Nov. 28 1545 4,100 116 12.83 3.911 Sept.20 1530 2,940 83.3 11.39 3.472 Apr. 16 2045 *7,940 225 *16.45 5.014 Minimum discharge, 5.1 ft'/s (0.145 m'/s), Aug. 3. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 11 14 e26 433 231 21 18 20 14 16 8.3 11 2 10 13 23 128 153 25 15 19 14 17 6.6 11 3 10 11 22 60 220 21 14 19 13 12 29 10 4 11 11 21 46 100 20 13 20 13 10 28 9.1 5 12 11 22 40 56 20 14 20 13 10 10 8.4 6 10 12 19 36 44 19 14 19 13 10 7.8 8.5 7 9.6 43 47 32 39 18 13 18 12 10 6.8 8.7 8 147 16 23 30 36 18 13 18 12 8.3 7.5 9.2 9 30 12 19 27 34 17 11 70 12 7.6 8.4 JO 10 15 11 18 26 33 17 11 119 11 12 19 36 11 11 11 17 26 32 17 13 125 25 12 13 125 12 10 12 17 25 32 16 62 41 18 10 8.7 58 13 10 12 16 26 33 16 22 30 14 9.3 7.5 27 14 9.6 10 16 26 30 17 20 28 12 10 7.8 19 15 18 11 22 23 31 16 114 25 14 7.5 8.1 16 16 12 11 17 22 29 16 1220 24 13 7.7 11 16 17 21 55 15 34 28 23 167 22 12 14 16 16 18 29 31 15 24 28 17 266 21 13 12 24 18 19 17 19 57 24 27 15 111 21 13 7.9 11 14 20 13 14 131 22 26 16 115 20 13 7.2 9 5 259 21 27 13 85 20 25 15 117 19 16 7.5 7 9 44 22 18 13 33 20 24 15 87 18 13 10 11 31 23 20 17 26 20 25 14 45 18 12 7.1 14 113 24 15 95 28 19 26 18 35 17 12 7.8 180 51 25 14 56 48 20 24 16 30 17 14 12 128 30 26 12 35 30 18 32 20 31 16 14 7.3 38 22 27 11 182 25 18 45 27 26 16 10 7.2 23 19 28 10 259 24 23 24 33 24 16 10 9.1 19 19 29 139 53 21 54 22 25 23 16 10 11 14 34 30 35 e33 24 26 --- 39 22 16 9.5 9.3 13 23 31 17 --- 153 57 33 --- 15 --- 7.6 12 --- TOTAL 734.2 1096 1060 1405 1489 620 2686 883 394.5 306.4 707.9 1095.9 MEAN 23.7 36.5 34.2 45.3 51.3 20.0 89.5 28.5 13.1 9.88 22.8 36.5 MAX 147 259 153 433 231 39 1220 125 25 17 180 259 MIN 9.6 10 15 18 22 14 11 15 9.5 7.1 6.6 8.4 AC-FT 1460 2170 2100 2790 2950 1230 5330 1750 782 608 1400 2170 CFSM 1.57 2.42 2.26 3.00 3.40 1.32 5.93 1.89 .87 .65 1.51 2.42 IN. 1.81 2.70 2.61 3.46 3.67 1.53 6.62 2.18 .97 .75 1.74 2.70 CAL YR 1987 TOTAL 14425.3 MEAN 39.5 MAX 1240 MIN 5.0 AC-FT 28610 CFSM 2.62 IN. 35.54 WTR YR 1988 TOTAL 12477.9 MEAN 34.1 MAX 1220 MIN 6.6 AC-FT 24750 CFSM 2.26 IN. 30.74 e Estimated RIO CIBUCO BASIN 115 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 1987 TO SEPTEMBER 1988 DIS- OXYGEN, OXYGEN COLT- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/1) 100 ML) 100 ML) OCT 1987 05... 0940 11 317 7.60 25.5 4.2 7.5 86 23 4800 2000 DEC 03... 0900 22 335 7.30 23.5 2.9 8.9 90 33 520 270 FEB 1988 05... 0935 58 286 7.40 22.0 8.4 95 K7200 2400 APR 08... 0915 13 352 7.20 23.0 9.0 7.7 89 15 2500 K1600 JUN 03... 0920 14 371 6.90 25.5 2.5 6.8 82 20 4500 690 AUG 08... 1020 8.7 372 6.70 26.0 1.8 6.6 81 <10 1500 1400 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SLUM, SODIUM, AD- SIUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED 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 1987 05... 130 18 33 11 18 0.1 3.1 110 <0.5 15 20 DEC 03... 120 FEB 1988 05... 96 APR 08... 120 6 28 11 17 0.7 2.9 120 <0.5 15 20 JUN 03... 120 AUG 08... 140 15 35 12 19 0.7 2.9 120 16 22 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1987 05... 0.2 33 199 7.0 2 1.05 0.05 1.10 0.11 0.69 DEC 03... 5 1.14 0.26 1.40 0.74 0.66 FEB 1988 05... 1.26 0.04 1.30 0.24 0.56 APR 08... 0.2 30 189 6.8 2 0.97 0.23 1.20 1.10 1.2 JUN 03... 10 0.71 0.19 0.90 0.92 0.18 AUG 08... 0.2 32 212 5.0 11 0.65 0.15 0.80 0.92 2.0 K = non-ideal count 118 RIO CIBUCO BASIN 50038320 RIO CIBUCO BELOW COROZAL, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOEER 1987 TO SEPTEMBER 1988 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- i.COV- 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 1987 05... 0.8 1.9 5.7 0.34 1 -100 30 <1 3 20 DEC 03... 1.4 2.8 8.4 0.31 FEB 1988 05... 0.8 2.1 9.3 0.11 APR 08... 2.3 3.5 15 0.74 1 <100 <10 <1 <1 <10 JUN 03... 1.1 2.0 8.9 0.45 AUG 08... 2.9 3.7 16 0.61 METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) MANGA- OCT 1987 05... 330 <5 60 0.10 <1 <1 40 <0.010 2 0.05 DEC 03... FEB 1988 05... APR 08... 320 <5 60 0.20 -1 <1 -10 <0.010 2 0.05 JUN 03... AUG 08... I I 117 RIO CIBUCO BASIN 50039500 RIO CIBUCO AT VEGA RAJA, PR i LOCATION.--Lat 18°26'53", long 66°22'29", Hydrologic Unit 21010002, on right bank, at bridge on Hwy 2, 0.6 (1.0 km) downstream from Rio Indio, and 0.8 mi (1.3 km) east of Vega Baja. DRAINAGE AREA.--99.1 mi 2 (256.7 km2 ), of which 25.4 mi 2 (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.--Records fair except those for estimated daily discharges. which are poor. AVERAGE DISCHARGE.--15 years (1974-88), 135 ft 3 /s (3.823 mi/s), 18.50 in/yr (470 mm/yr), 97,810 acre-ft/yr (121 hm7yr); median of yearly mean discharges, 143 ft'is (4.05 m'/s), 104,000 acre-ft/yr (128 hm'/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 34,000 fti/s (963 m'/s), Dec. 13, 1981, gage height, 19.10 ft (5.822 ), from rating curve extended above 3,000 ft'/5 (85.0 m'/s) on the basis of indirect measurements: minimum discharge, 6.1 ft'/s (0.173 m'/s), July 24, 25, 1977. EXTREMES OUTSIDE PERIOD OF RECORD.--Flood of Dec. 11, 1965 reached a stage of 26.2 ft (1.99 m), datum unknown, discharge about 28,000 ft'/s (793 m'/s). EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 3,200 ft'is (90.6 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (0 3 /s) (ft) (m) Date Time (ft'/s) (e/s) (ft) (m) Apr. 17 0300 *16,600 470 *17.70 5.395 May 11 0445 5,460 155 16.23 4.947 Minimum daily discharge, 28 ft'/s (0.793 m'/s), Aug. 14. DISCHARGE, CUBIC FEET PER SECOND. WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 e54 46 102 1400 698 80 79 110 57 71 56 80 2 e52 41 87 1140 594 86 61 97 55 80 55 75 3 e48 38 81 439 693 74 53 88 56 71 94 63 4 e75 35 77 297 595 69 51 80 53 50 301 59 5 e108 35 75 244 215 66 49 80 54 44 73 56 6 e69 37 93 222 133 65 55 75 52 47 48 52 7 e43 146 119 192 175 65 49 70 52 74 36 54 8 9 e39 e90 128 50 124 87 167 150 162 147 63 61 48 43 80 228 53 53 64 42 34 31 53 e220 10 el60 43 82 134 133 60 42 1020 53 56 54 e350 11 e88 40 79 131 124 61 43 2280 75 57 95 e780 12 e56 39 78 124 123 58 120 442 91 61 39 e490 13 e65 47 79 113 127 55 189 226 68 46 29 e290 14 e46 42 76 126 124 59 36 165 66 50 28 132 15 37 40 107 105 108 55 852 129 108 46 29 100 16 48 44 91 97 107 55 1230 108 129 39 32 91 17 29 201 78 133 95 76 5120 94 123 47 72 91 18 58 295 75 111 97 76 908 83 121 64 159 120 19 20 53 98 95 68 105 726 109 88 90 88 62 56 976 675 75 74 139 133 52 44 67 43 106 462 21 148 59 743 73 82 53 542 69 131 41 43 614 22 235 60 232 71 79 51 781 66 150 49 48 260 23 52 59 142 69 80 49 382 62 123 50 78 375 24 51 174 110 64 91 55 286 60 76 44 603 370 25 47 403 253 84 82 60 235 57 83 68 1080 190 26 27 38 34 113 580 195 166 64 59 79 199 73 79 200 174 58 56 125 69 74 57 332 259 152 142 28 29 30 31 31 128 165 51 856 558 154 --- 118 106 99 516 74 172 122 106 113 85 --- 159 140 138 160 148 135 123 --- 55 60 64 60 71 62 57 --- 50 78 86 62 232 126 90 76 158 187 164 --- TOTAL MEAN 2296 74.1 4526 151 5101 165 6480 209 5518 190 2319 74.8 13685 456 6271 202 2538 84.6 1764 56.9 4342 140 6336 211 MAX MIN 235 29 856 35 743 75 1400 59 698 79 160 49 5120 36 2280 55 150 52 86 39 1080 28 780 52 AC-FT CFSM 4550 .75 8980 1.52 10120 1.66 12850 2.11 10940 1.92 4600 .75 27140 4.60 12440 2.04 5030 .85 3500 .57 8610 1.41 12570 2.13 IN. .86 1.70 1.91 2.43 2.07 .87 5.14 2.35 .95 .66 1.63 2.38 CAL YR 1987 TOTAL 71267 MEAN 195 MAX 10000 MIN 20 AC-FT 141400 CFSM 1.97 14. 26.75 WTR YR 1988 TOTAL 61176 MEAN 167 MAX 5120 MIN 28 AC-FT 121300 CFSM 1.69 IN. 22.96 e Estimated 118 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 1987 TO SEPTEMBER 1988 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1987 6... 0850 51 427 7.40 26.5 3.1 4.0 49 47 5000 770 DEC 7... 1030 82 440 7.20 25.0 5.3 5.8 70 19 K9800 1000 FEB 1988 8... 1110 160 403 7.40 23.0 7.5 87 K1700 K2000 APR 06... 1010 59 430 7.20 25.0 4.5 4.9 54 13 K400 K450 JUN 13... 1110 75 407 6.80 26.5 5.9 5.3 65 18 K6700 800 AUG 9... 1245 42 466 7.80 27.5 1.7 4.5 57 <10 K770 340 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- UNITY CHLO- NESS NONCARB CALCIUM SLUM, SODIUM, AD- S1UM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- D1S- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLO SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1987 6... 180 15 60 8.4 16 0.5 3.2 170 <0.5 17 21 DEC 7... 180 FEB 1988 8... 160 APR 06... 180 10 55 9.3 17 0.6 2.6 160 <0.5 17 21 JUN 13... n AUG 9... 200 12 63 9.4 16 0.5 2.8 180 16 21 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2-0403 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1987 6... 0.20 19 247 34 4 1.11 0.09 1.20 0.19 0.51 DEC 7... 10 0.69 0.01 0.70 0.15 0.05 FEB 1988 8... 1.27 0.03 1.30 0.09 0.41 APR 06... 0.20 19 241 39 7 1.42 0.08 1.50 0.25 0.25 JUN 13... 6 1.14 0.06 1.20 0.15 0.25 AUG 9... 0.20 19 258 30 4 1.21 0.09 1.30 0.17 0.73 K = non-ideal count RIO CIBUCO BASIN 50039500 RIO CIBUCO AT VEGA BAJA, PR—Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOv_ TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1987 6... 0.7 1.9 5.7 0.24 1 <100 <10 1 10 110 DEC 7... 0.2 0.9 4.0 0.19 FEB 1988 8... 0.5 1.8 8.0 0.14 APR 06... 0.5 2.0 8.9 0.27 1 100 20 1 <1 <10 JUN 13... 0.4 1.6 7.1 0.15 AUG 9... 0.9 2.2 9.7 0.30 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 1987 06,., 420 <5 40 <0.10 <1 13 40 <0.010 1 0.02 DEC 7... FEB 1988 8... APR 06... 480 <5 60 <0.10 <1 <1 <10 <0.010 4 0.04 JUN 13... AUG 9... 119 120 THIS PAGE WAS LEFT BLANK INTENTIONALLY 121 0214 DORADO ., 0 CAT VEGA ALTA Limestone --I/— Igneous and sedimentary rocks Drainage boundaries indeterminate BAYAMON in limestone terrane TOA ALTA Pro L cps Limestone ligneous and rTh sedimentary rocks N J N \ COROZAL 6 -..Map area FAJAIM;1 ).MAYAGUEZ .CA6t1AS 044850 0 NARAN Rra Cibuco basin Represa de Comerro Rra de Bayamon basin Drainage bound COME Rao Grande dt ',Sancti basin BARRARrOUITAS Island \divide CIDRA Rio Grande 1.01.20 DOSin I 0430 La Plotri AIBONITO Island divide Rio Coarna basin EXPLANATION Rca Salinas (Nigua) basin A10469 SURFACE—WATER STATION AND NUMBER de P,:tiIids QUALITY—OF—WATER STATION AND NUMBER bath 7°43° b 411111ES QUALITY—OF—WATER PARTIAL RECORD V0399 STATION AND NUMBER I 5 6 KILOMETERS 1 1216 -Tunnel to WELL AND WELL NUMBER Rib Guam: R(o Guarni3 I basin Figure 16.--Rio de la Plata basin. 122 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 mi' (141.9 km 2 ), excludes 8.2 mi' (21.1 km') upstream from Carite Reservoir, the flow of which is diverted to Rio Guamani. WATER-DISCHARGE RECORDS PERIOD OF RECORD.--1958 (occasional measurements only)., February 1959 to March 1960 (monthly measurements only), April 1960 to current year. GAGE.--Water-stage recorder. Elevation of gage is 850 ft (259 m), from topographic map. Prior to Mar. 29, 1961, wire-weight gage read twice daily at same site and datum. REMARKS.--Records are fair. The Puerto Rico Aqueduct and Sewer Authority operates a pumping plant about 5 mi (8 km) upstream which can divert as much as 23 ft'/s (0.65 m'/s) into Cidra Reservoir. AVERAGE DISCHARGE.--28 years (1961-88), 110 ft 3 /s (3.115 m"/s), 27.26 in/yr (692 mm/yr), 79,700 acre-ft/yr (98.3 hm'/yr); median of yearly mean discharges, 91 ft 3 /s (2.58 m'/s), 65,900 acre-ft/yr (81 hm'/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 59,600 fti/s (1,690 m"/s), Aug. 27, 1961, gage height, 32.21 ft (9.818 m), from rating curve extended above 7,000 ft-/s (198 m 3 /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) (110/s) (ft) (m) Date Time (ft'/s) (m'/s) (ft) (m) Nov. 27 1715 *4,420 125 *10.41 3.173 Minimum discharge, 4.0 ft'/s (0.113 m'/s), May 6. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 23 11 255 600 74 25 15 5.4 11 380 254 73 2 14 11 173 356 79 29 13 8.3 11 643 197 62 3 9.8 8.6 129 178 213 29 13 5.5 9.3 493 216 53 4 12 9.8 107 137 112 26 15 5.3 8.9 181 400 48 5 15 24 109 143 74 25 15 5.0 9.0 95 170 45 6 13 251 107 131 71 23 35 6.5 8.7 67 118 37 7 11 87 581 123 59 22 54 19 8.9 152 95 40 8 16 26 1220 115 50 23 16 7.1 9.5 69 103 74 9 13 17 357 96 46 20 10 5.4 9.0 43 81 98 10 9.3 14 219 106 44 20 10 107 8.9 42 88 198 11 8.3 12 209 111 42 19 8.6 31 9.1 43 492 1030 12 8.8 11 206 132 50 19 8.7 18 9.5 36 254 938 13 8.8 13 148 94 80 17 9.1 17 11 30 169 692 14 8.0 13 118 108 51 17 8.8 13 12 28 130 677 15 10 9.0 104 74 51 16 10 13 104 25 95 384 16 26 8.7 100 64 46 16 12 19 98 20 89 330 17 53 14 86 65 39 17 52 18 20 20 194 222 18 991 17 81 60 37 17 74 16 13 20 500 169 19 304 14 90 57 34 16 20 16 13 22 226 135 20 48 15 178 51 33 18 8.2 23 15 22 159 175 21 26 11 181 46 36 21 6.9 20 22 13 136 107 22 20 9.2 258 43 29 16 12 24 25 10 284 88 23 17 22 164 42 27 18 9.1 15 32 18 613 100 24 16 1320 123 42 34 19 7.7 14 24 16 665 88 25 20 767 139 41 38 18 6.6 12 20 12 752 81 26 19 331 94 42 34 17 7.9 12 36 7.9 520 76 27 26 1590 104 39 50 20 6.7 11 27 13 261 72 28 36 1410 91 39 38 31 6.5 11 18 183 215 66 29 38 852 101 39 28 26 5.0 11 14 380 165 62 30 22 377 78 58 --- 20 5.2 13 33 373 133 56 31 15 --- 129 42 16 --- 12 --- 397 102 --- TOTAL 1857.0 7275.3 6039 3274 1599 636 481.0 513.5 649.8 3853.9 7876 6276 MEAN 59.9 243 195 106 55.1 20.5 16.0 16.6 21.7 124 254 209 MAX 991 1590 1220 600 213 31 74 107 104 643 752 1030 MIN 8.0 8.6 78 39 27 16 5.0 5.0 8.7 7.9 81 37 AC-FT 3680 14430 11980 6490 3170 1260 954 1020 1290 7640 15620 12450 CFSM 1.09 4.43 3.55 1.93 1.01 .37 .29 .30 .40 2.27 4.64 3.82 IN. 1.26 4.94 4.10 2.22 1.09 .43 .33 .35 .44 2.62 5.35 4.26 CAL YR 1987 TOTAL 27518.3 MEAN 75.4 MAX 1590 MIN 8.0 AC-FT 54580 CFSM 1.38 IN. 18.68 WTR YR 1988 TOTAL 40330.5 MEAN 110 MAX 1590 MIN 5.0 AC-FT 80000 CFSM 2.01 IN. 27.38 RIO DE LA PLATA BASIN 123• 50043000 RIO DE LA PLATA AT PROYECTO LA PLATA, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORD.--Water years 1958 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1987 07... 1120 11 428 7.90 28.5 6.8 9.1 120 30 480 K67 DEC 02... 1030 179 250 7.30 25.0 6.3 8.0 99 28 2700 3200 FEB 1988 11... 0955 41 390 7.80 24.0 9.3 113 K180 260 APR 05... 1200 15 437 7.80 27.0 3.5 10.3 132 100 K140 K220 JUN 14... 1010 11 540 7.60 28.0 7.6 7.8 102 42 210 K220 AUG 11... 1035 594 116 7.40 26.5 190 5.5 70 19 K100000 410000 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SLUM, SODIUM, AD- SIUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLO SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1987 07... 160 10 41 14 31 1 2.7 150 <0.5 19 31 DEC 02... 89 FEB 1988 11... 140 APR 05... 170 0 43 16 37 1 2.4 160 <0.5 20 35 JUN 14... 190 AUG 11... 36 0 8.6 3.6 9.6 0.7 1.8 41 9.8 10 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1987 07... 0.20 26 255 7.4 20 2.04 0.06 2.10 0.06 0.44 DEC 02... 7 0.95 0.05 1.00 0.06 0.34 FEB 1988 11... 1.25 0.05 1.30 0.03 0.37 APR 05... 0.30 25 - 284 12 4 1.93 0.07 2.00 0.06 0.64 JUN 14... 6 1.83 0.07 1.90 0.03 0.57 AUG 11... 0.10 12 79 126 27 0.24 0.06 0.30 0.15 1.8 K = non-ideal count 124 RIO DE LA PLATA BASIN 50043000 RIO DE LA PLATA AT PROYECTO LA PLATA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1987 07... 0.5 2.6 12 0.75 1 -100 20 1 7 10 DEC 02... 0.4 1.4 6.2 0.08 FEB 1988 11... 0.4 1.7 7.5 0.37 -- APR 05... 0.7 2.7 12 0.64 <1 <100 10 <1 <1 10 JUN 14... 0.6 2.5 11 1.00 - AUG 11... 2.0 2.3 10 0.20 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENT 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 1987 07... 670 <5 60 <0.10 2 <1 <10 <0.010 3 0.08 DEC 02... FEB 1988 11... APR 05... 160 <5 30 <0.10 <1 <1 <10 <0.010 <1 0.09 JUN 14... AUG RIO DE LA PLATA BASIN 1.25 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 mi' (360 kill), excludes 8.2 ml' (21.1 km') upstream from Carite Reservoir, the flow of which is diverted to Rio Guamani. PERIOD OF RECORD.--Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1987 15... 1150 34 399 7.90 27.5 3.7 8.8 112 <10 940 600 DEC 11... 1035 297 272 7.50 25.5 9.6 7.9 97 16 1400 800 FEB 1988 19... 0815 28 406 7.80 23.0 6.6 77 570 460 APR 19... 0850 E800 245 7.10 24.0 130 7.6 91 23 K17000 22000 JUN 16... 0900 E480 436 7.20 26.5 23 7.5 94 <10 K12000 4200 AUG 22... 0850 66 318 6.80 26.0 14 7.4 92 43 K1900 K540 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM S1UM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE D1S- 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 1987 15... 160 11 38 16 26 0.9 2.8 150 <0.5 20 27 DEC 11... 90 FEB 1988 19... 140 APR 19... 81 6 19 8.1 15 0.7 3.2 69 <0.5 17 15 JUN 16... 130 AUG 22... 110 2 25 11 23 1 2.4 96 23 75 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1987 15... 0.20 31 251 23 7 0.86 0.04 0.90 0.07 0.43 DEC 11... 2 <0.01 0.80 <0.01 FEB 1988 19... 0.87 0.03 0.90 0.06 0.44 APR 19... 0.20 19 141 186 1.51 0.09 1.60 0.15 0.75 JUN 16... -- 36 0.71 0.09 0.80 0.17 1.03 AUG 22... 0.10 25 248 44 18 0.87 0.03 0.90 0.04 0.36 K = non-ideal count E = estimate 126 RIO DE LA PLATA BASIN 50044000 RIO DE LA PLATA NEAR COMERIO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA • NITRO NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1987 15... 0.5 1.4 6.2 0.34 1 200 40 1 20 10 DEC 11... 0.2 0.17 - FEB 1988 19... 0.5 1.4 6.2 0.23 APR 19... 0.9 2.5 11 0.31 <1 100 50 1 17 660 JUN 16... 1.2 2.0 6.0 0.60 AUG 22... 0.4 1.3 5.8 0.28 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENS 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 1987 15... 300 <5 40 <0.10 <1 <1 <10 <0.010 3 0.03 DEC 11... FEB 1988 19... APR 19... 11000 16 230 0.30 <1 <1 20 <0.010 0.04 JUN 16... AUG 22... 127 RIO DE LA PLATA BASIN 50044850 RIO GUADIANA NEAR NARANJ1TO, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°18'39", long 66 - 13'28", at steel-cross-bridge 0.8 mi (1.3 km) northwest of Highway 164. 1.2 mi (1.9 km) upstream from mouth and about 2.0 mi (3.2 km) northeast of Naranjito plaza. DRAINAGE AREA.--4.0 mil (10.3 km2 ). PERIOD OF RECORD.--Water year 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL. FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1987 15... 0855 5.9 335 7.60 25.0 3.4 7.7 92 <10 390 900 DEC 11... 1255 7.9 343 7.80 26.0 1.4 7.9 97 12 K650 470 FEB 1988 19... 1020 15 319 7.70 24.0 0.4 8.9 99 <10 240 280 APR 19... 1055 33 285 7.50 25.0 17 8.0 96 35 21000 4700 JUN 16... 1045 7.4 333 7.50 26.0 0.7 7.8 95 <10 K830 550 AUG 22... 1100 6.2 338 7.20 26.0 2.0 7.4 90 31 230 650 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SIUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1987 15... 150 25 35 14 18 0.7 2.3 120 <0.5 16 22 DEC 11... 110 FEB 1988 19... 92 APR 19... 100 10 22 12 13 0.6 2.3 82 <0.5 17 15 JUN 16... 110 AUG 22... 130 13 29 14 17 0.7 2.1 11, 16 22 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1987 15... 0.20 29 208 3.3 3 1.38 0.02 1.40 0.06 0.14 DEC 11... 2 1.79 0.01 1.80 0.01 0.19 FEB 1988 19... 1.28 0.02 1.30 0.08 0.32 APR 19... 0.20 25 163 14 8 1.38 0.02 1.40 0.03 0.47 JUN 16... 10 0.96 0.04 1.00 0.03 0.77 AUG 22... 0.10 27 197 3.3 2 0.98 0.02 1.00 0.01 0.29 K = non-ideal count 128 RIO DE LA PLATA BASIN 50044850 RIO GUADIANA NEAR NARANJITO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM M1UM, COPPER, MONIA r NITRO- NITRO- PROS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1987 15... 0.2 1.6 7.1 0.24 1 <100 <10 1 <1 <10 DEC 11... 0.2 2.0 8.9 0.30 FEB 1988 19... 0.4 1.7 7.5 0.15 APR 19... 0.5 1.9 8.4 0.16 <1 <100 20 1 6 180 JUN 16... 0.8 1.8 8.0 0.23 AUG 22... 0.3 1.3 5.8 0.26 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/I (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) CN) (UG/L) (MG/L) OCT 1987 15... 240 <5 30 <0.10 <1 <1 20 <0.010 6 0.02 DEC 11... FEB 1988 19... APR 19... 13000 <5 70 <0.10 <1 <1 20 <0.010 1 2.0 JUN 16... AUG 22... 129 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 mi' (539 km2 ), exclude 8.2 mi' (21.2 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 1987 TO SEPTEMBER 1988 DIS- OXYGEN, COLI- STREP- CHARGE, SPE- DIS- FORM, TOCOCCI HARD- INST. CIFIC SOLVED FECAL, FECAL, NESS CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- 0.7 KF AGAR TOTAL FEET DUCT- (STAND- ATURE BID- D1S- CENT UM-MF (COLS. (MG/L DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- (COLS./ PER AS SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) 100 ML) 100 ML) CAC03) OCT 1987 14... 1035 20 465 7.10 28.5 2.2 7.0 90 K1100 210 220 DEC 04... 0930 208 225 6.80 26.0 69 6.4 78 K440 K450 94 FEB 1988 12... 1000 123 411 7.00 25.5 12 6.2 75 4000 260 160 APR 18... 1000 1130 235 7.20 26.0 49 7.4 90 5600 4100 130 JUN 06... 1310 19 454 7.70 33.0 16 15.6 211 K920 <10 230 AUG 08... 0935 54 372 7.20 28.5 1.4 3.6 46 4300 2600 150 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- FLUO- SILICA, NONCARB CALCIUM SIUM, SODIUM, AD- SLUM, WAT WH SULFAL RIDE, RIDE, DIS- WH WAT DIS- DIS- DIS- SORP- D1S- TOT FET DIS- DIS- DIS- SOLVED TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD SOLVED SOLVED SOLVED (MG/L DATE MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L AS CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS SO4) AS CL) AS F) SI02) OCT 1987 14... 29 65 13 24 0.7 3.6 180 20 31 0.2 20 DEC 04... 13 26 7 12 0.6 2.3 81 17 13 0.2 670 FEB 1988 12... 15 47 11 19 0.7 2.8 140 16 22 0.2 18 APR 18... 0 32 11 17 0.7 2.0 120 16 19 0.2 16 JUN 06... 29 69 13 23 0.7 2.1 190 22 30 0.3 18 AUG 08... 10 43 11 19 0.7 2.0 140 15 20 0.2 19 SOLIDS, SOLIDS, NITRO- NITRO- NITRO- NITRO- PHOS- PHOS- RESIDUE SUM OF SOLIDS, GEN, GEN, GEN, GEN,AM- PHOS- PHOROUS PRATE, AT 180 CONSTI- DIS- NO20403 AMMONIA AMMONIA MONIA + PHOS- PHOROUS ORTHO, ORTHO, DEG. C TUENTS, SOLVED DIS- DIS- DIS- ORGANIC PHOROUS DIS- DIS- DIS- DIS- DIS- (TONS SOLVED SOLVED SOLVED TOTAL TOTAL SOLVED SOLVED SOLVED DATE SOLVED SOLVED PER (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L) (MG/L) DAY) AS N) AS N) AS NH4) AS N) AS P) AS P) AS P) AS PO4) OCT 1987 14... 287 294 16 0.80 0.12 0.15 1.0 0.27 0.26 0.24 0.74 DEC 04... 150 806 453 2.80 0.12 0.15 0.4 0.13 0.08 0.05 0.15 FEB 1988 12... 229 228 76 0.53 0.24 0.31 0.18 0.18 0.16 0.49 APR 18... 194 189 577 0.13 0.06 0.08 0.6 0.16 0.06 0.05 0.15 JUN 06... 300 298 15 0.32 0.02 0.03 0.7 0.26 0.24 0.20 0.61 AUG 08... 241 218 32 0.42 0.20 0.26 0.8 0.11 0.09 0.09 0.28 K = non-ideal count 130 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 1987 TO SEPTEMBER 1988 ALUM- BERYL- CHRO- INUM, ARSENIC BARIUM, LIUM, CADMIUM MIUM, COBALT, COPPER, IRON, LEAD, DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS AL) AS AS) AS BA) AS BE) AS CD) AS CR) AS CO) AS CU) AS FE) AS PB) OCT 1987 14... <10 2 53 <0.5 <1 <1 <3 3 11 10 DEC 04... - - FEB 1988 12... 60 1 46 <0.5 <1 -1 <3 4 11 <5 APR 18... - JUN 06... 130 <1 49 <0.5 <1 <1 <3 27 74 <5 AUG 08... 50 2 52 <0.5 <1 <1 <3 2 20 <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 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 1987 14... <4 150 <0.1 <10 3 <1 1 270 6 4 DEC 04... FEB 1988 12... 6 56 <0.1 <10 4 <1 <1 180 9 8 APR 18... JUN 06... 12 39 0.2 <10 4 <1 <1.0 280 8 18 AUG 08... <4 140 <0.1 <10 1 <1 1.0 170 <6 8 PESTICIDE ANALYSES CHLOR- DI- DI- ENDO- PCB, ALDRIN, DANE, DDD, DDE, DDT, AZINON, ELDRIN SULFAN, DATE TIME TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN 1988 06... 1310 <0.1 <0.01 <0.1 <0.01 <0.01 <0.01 0.07 <0.01 <0.01 HEPTA- METH- METHYL METHYL HEPTA- CHLOR MALA- OXY- PARA- TRI- ENDRIN, ETHION, CHLOR, EPDXIDE LINDANE THION, CHLOR, THION, THION, MIREX, DATE TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN 1988 06... <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 NAPH- THA- LENES, PARA- POLY- PER- TOX- TOTAL THION, CHLOR. THANE APHENE, TRI- 2,4-D, 2,4,5-T 2, 4-DP SILVEX, DATE TOTAL TOTAL TOTAL TOTAL THION TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN 1988 06... <0.01 <0.1 <0.1 <1 <0.01 <0.01 <0.01 <0.01 <0.01 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 1987 TO SEPTEMBER 1988 PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT SED. SEDI- SUSP. MENT, SIEVE STREAM- SEDI- DIS- DIAM. FLOW, MENT, CHARGE, PERCENT INSTAN- SUS- SUS- FINER DATE TIME TANEOUS PENDED PENDED THAN (CFS) (MG/L) (T/DAY) .062 MM OCT 1987 14... 1030 20 61 3.3 65 FEB 1988 12... 0955 123 112 37.2 87 APR 18... 1000 235 166 105 94 JUN 06... 1310 19 102 5.2 89 AUG 08... 0935 54 78 11 89 .131 132 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. DRAINAGE AREA.--208 mi 2 (539 km'), excludes 8.2 mi 2 (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'). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--November 1959 (measurement only), January 1960 to current year. Prior to October 1984, published as Rio de la Plata at Toa Alta, P.R. GAGE.--Water-stage recorder. Datum of gage is 17.00 ft (5.182 m), below mean sea level (Puerto Rico Department of Public Wones Benchmark). Prior to Sept. 25, 1984, at site about 1.0 ml (1.6 km) upstream at mean sea level datum. REMARKS.--Records fair except those for estimated daily discharges, which are poor. Regulation at all stages by Puerto Rico Aqueduct and Sewer Authority reservoir upstream from gage. AVERAGE DISCHARGE.--28 years (1961-88), 282 ft'is (7.986 m'/s), 19.15 in/yr (486 mm/yr), 204,300 acre-ft/yr (252 hm"/yr): median of yearly mean discharges, 246 ft'/s (6.97 m'/s). 180,000 acre-ft/yr (222 hm'/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 95,500 ft'/s (2,700 m'/s), Sept. 6, 1960, gage height, 36.35 ft (11.079 m), from floodmark, from rating curve extended above 12,000 ft'/s (340 m'/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 m'/s), Apr. 25, 1984. EXTREMES OUTSIDE PERIOD OF RECORD.--Approximate discharges and elevations of major floods, as pointed out by local residents are as follows: Sept. 13, 1928, 120,000 ft'/s (3,400 m'/s), gage height, 37.4 ft (11.40 m); June 16, 1943, 82,000 ft'is (2,320 m'/s), gage height, 34.4 ft (10.48 m), at site 1.0 mi upstream and different datum. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 6,000 ft'/s (170 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (m0/s) (ft) (m) Date Time (f't/s) (m'/s) (ft) (m) Nov. 25 0200 12,600 357 16.53 5.038 Aug. 24 2400 19,000 538 18.19 5.544 Nov. 27 2245 *29,200 827 *20.43 6.227 Sept.11 1930 8,850 251 13.83 4.215 May 10 2215 8,060 228 13.34 4.066 Minimum discharge, 11 ft'/s (0.312 m'/s), June 18, 29, 30. RIO DE LA PLATA BASIN 133 50046900 RIO DE LA PLATA AT HIGHWAY 2 NEAR TOA ALTA, PR--Continued DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 2 3 4 5 35 30 25 22 20 41 27 22 20 19 479 329 248 205 193 e2600 e4600 e900 e500 e420 841 955 1170 934 449 91 76 70 67 58 78 59 49 45 41 66 51 44 38 33 18 17 19 19 17 26 487 997 340 373 24 25 145 189 215 229 152 109 86 71 6 7 8 9 10 19 20 19 21 24 90 410 204 86 47 278 222 1320 836 441 e370 e340 e310 e290 e280 287 219 185 158 139 51 49 49 44 45 39 49 102 64 45 32 27 25 146 878 16 21 23 18 16 177 101 65 66 68 113 95 55 40 89 58 56 54 359 476 11 12 13 14 15 18 18 19 21 36 29 26 20 16 16 295 369 299 218 234 e270 e260 245 233 214 135 189 217 170 147 42 41 38 49 45 35 63 154 75 1460 486 196 133 100 61 22 29 29 20 19 52 48 35 32 22 110 175 169 107 69 3930 2840 1450 847 590 16 17 18 19 20 35 24 286 1140 317 19 130 123 76 56 210 169 137 257 e1300 167 176 200 182 145 138 121 111 99 92 38 60 60 47 38 546 844 988 757 597 36 26 22 19 17 18 15 13 22 32 20 31 39 34 23 52 62 418 367 171 422 489 539 274 462 21 22 23 24 25 164 144 113 104 83 35 26 26 2040 5360 e500 e350 e300 e250 e400 127 111 103 97 114 85 81 76 83 85 36 34 33 35 39 355 527 197 142 129 17 15 17 14 19 54 35 25 16 19 22 22 21 19 29 97 252 410 4350 7640 341 224 158 458 202 26 27 28 29 30 31 47 37 32 30 54 58 1040 7640 8770 1740 765 --- e300 e250 e230 e210 e200 e1800 101 96 122 295 259 188 82 289 209 126 --- 46 68 255 165 207 141 112 94 68 61 56 --- 17 17 18 19 17 19 25 16 15 14 16 --- 38 37 29 67 48 27 1450 878 448 296 214 178 139 117 116 151 117 --- TOTAL MEAN MAX MIN AC-FT CFSM IN. 3015 97.3 1140 18 5980 .49 .56 28919 964 8770 16 57360 4.82 5.38 12829 414 1800 137 25450 2.07 2.39 14315 462 4600 96 28390 2.31 2.66 7872 271 1170 76 15610 1.36 1.46 2117 68.3 255 33 4200 .34 .39 7831 261 1460 35 15530 1.31 1.46 2625 84.7 878 14 5210 .42 .49 638 21.3 54 13 1270 .11 .12 3395 110 997 19 6730 .55 .63 18903 610 7640 24 37490 3.05 3.52 15516 517 3930 54 30780 2.59 2.89 CAL YR 1987 WTR YR 1988 TOTAL 119424 MEAN 327 MAX 9060 MIN 14 AC-FT 236900 CFSM 1.64 IN. 22.21 TOTAL 117975 MEAN 322 MAX 8770 MIN 13 AC-FT 234000 CFSM 1.61 IN. 21.94 e Estimated 134 THIS PAGE WAS LEFT BLANK INTENTIONALLY 135 OCEANO ATLAN CO SAN JUAN • 218 Drainage boundaries indeterminate in limestone terrane Limestone Igneous and sedimentary rocks TRUJILLO ALTO N Drainage boundary Drainage boundary AGUAS BUENAS 0470 Rio de ICI Plato basin ,/ 71550 Rco Grande de LQi2C1 basin Logo de Cidra CIDRA f. EXPLANATION v-Map area JURN ,..)..AGUADIL L. A •A .„,a-Tr--­'­'n,lrr ' , 7.i• ..•,:,.• FAJA DO. \ThelAYAGUEZ PQSCO YANA. 2 A)47550SURFACE-WATER STATION AND NUMBER V4713 QUALITY—OF—WATER STATION AND NUMBER 0220 WELL AND WELL NUMBER 3 4 MILES 1 5 :OVUM rm. Figure 17.--Rio Hondo to Rio Puerto Nuevo basins. 138 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 1987 TO SEPTEMBER 1988 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1987 26... 0710 1960 7.50 26.0 24 2.8 34 24 40000 310000 DEC 17... 1425 21600 8.50 30.0 3.3 15.8 208 36 5100 K1200 FEB 1988 25... 0810 E150 12000 7.40 24.0 3.6 5.6 66 22 K65000 3300 APR 26... 0845 ED 3700 8.40 27.5 4.2 8.1 102 41 K4000 K1000 JUN 20... 0915 E20 6500 7.40 27.5 4.8 1.9 24 68 K97000 K910 AUG 19... 0845 EO 4600 7.40 28.0 9.5 4.4 55 18 K15000 K1000 HARD- ALKA- FARO- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SIUM, SODIUM, AD- SIUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1987 26... 260 170 44 37 300 8 15 96 <0.5 87 520 DEC 17... 140 FEB 1988 25... 170 APR 26... 440 300 59 72 560 12 22 140 <0.5 170 980 JUN 20... 150 AUG 19... 580 440 76 94 770 14 28 150 -- 220 1400 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1987 26... 0.10 8.8 1070 28 0.16 0.04 0.20 1.00 0.90 DEC 17... 12 0.18 0.12 0.30 2.00 3.5 FEB 1988 25... 16 0.16 0.14 0.30 1.50 3.9 APR 26... 0.30 14 1960 18 0.01 ,0.10 0.06 0.74 JUN 20... 18 0.02 <0.10 1.60 3.6 AUG 19... 0.20 12 2680 14 0.03 0.07 0.10 2.50 0.30 K = non-ideal count E = estimate RIO HONDO BASIN 50047530 RIO HONDO AT FLOOD CHANNEL NEAR CATANO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS 8) AS CD) AS CR) AS CU) OCT 1987 26... 1.9 2.1 9.3 0.31 9 ,100 140 ,1 -1 10 DEC 17... 5.5 5.8 26 0.72 FEB 1988 25... 5.4 5.7 25 1.30 APR 26... 0.8 0.33 2 100 230 1 1 10 JUN 20... 5.2 1.70 AUG 19... 2.8 2.9 13 0.79 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 MANGA- (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/1) OCT 1987 26... 1600 9 200 0.10 <1 <1 20 <0.010 4 0.11 DEC 17... FEB 1988 25... APR 26... 620 <5 220 0.10 <1 <1 20 <0.010 2 0.59 JUN 20... AUG 19... 137 138 RIO DE BAYAMON BASIN 50047550 LAGO CIDRA AT DAMSITE NEAR C1DRA, PR LOCATION.--Lat18°11'57", long 66'08'29", Hydrologic Unit 21010005, at Lago de Cidra Dam on Rio de Bayamon, 1.9 mi (3.0 km) northeast of Plaza de Cidra and 1.8 mi (2.9 km) northwest of Escuela Segunda Unidad de Bayamon. DRAINAGE AREA.--8.26 mi' (21.4 km 2 ). ELEVATION RECORDS PERIOD OF RECORD.--January 1988 to September 1988. GAGE.--Water-stage recorder. Datum of gage is 1,337.58 ft (407.694 m) above mean sea level; gage readings has been adjusted to elevations above mean sea level. REMARKS.--Lago de Cidra was completed in 1946. The maximum storage is 5,300 ac-ft (6.53 hm') and provides supple­ mental water to metropolitan San Juan. The dam is a concrete gravity and earthfill structure approximately 541 ft (165 m) long between abutments with a maximum structural height of about 78.7 ft (24.0 m). The spillway portion of the dam, length 131 ft (40.0 m) and crest elevation 1,322 ft (403 m), is an ungated ogee crest located 131 ft (40.0 m) from the right abutment. This dam is owned by Puerto Rico Aqueduct and Sewer Authority. EXTREMES OBSERVED FOR CURRENT PERIOD.--Maximum elevation, 1,323.99 ft (403.552 m), Feb. 3; minimum elevation, 1,308.61 ft (398.864 m), Aug. 17. Capacity Table (based on data from Puerto Rico Electric Power Authority) Elevation, in feet Contents, in acre-feet Elevation, in feet Contents, in acre-feet 1,306 2,010 1,319 4,40G 1,309 2,610 1,322 5,200 1,312 3,100 1,324 5,800 ELEVATION (FEET NGVD), WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 OBSERVATION AT 24:00 VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 1323.79 1323.62 1321.47 1320.79 1317.40 1309.47 2 1323.82 1323.61 1321.42 1320.68 1317.23 1309.30 3 1323.77 1323.59 1321.36 1320.57 1316.99 1309.58 4 1323.61 1323.58 1321.29 1320.44 1316.70 1309.58 5 1323.58 1323.57 1321.22 1320.29 1316.43 1309.52 6 1323.55 1323.54 1321.22 1320.24 1316.13 1309.38 7 1323.53 1323.48 1321.25 1320.09 A 1309.27 8 1323.53 1323.46 1321.19 1319.93 1309.16 1316.14 9 1323.53 1323.43 1321.13 1319.80 1313.31 1309.04 1316.43 10 1323.54 1322.36 1321.04 1320.04 1313.12 1309.03 1316.91 11 1323.54 1322.27 1320.97 1320.04 1312.97 1309.19 1320.89 12 1323.54 1322.17 1320.88 1320.00 1312.81 1309.08 1322.28 13 1323.54 1322.08 1320.78 1319.94 1312.66 1308.94 1322.50 14 1323.54 1322.99 1320.68 1319.88 1312.49 1308.79 1322.62 15 1323.57 1322.96 1320.59 1319.79 1312.33 1308.69 1322.70 16 1323.54 1322.95 1320.47 1319.66 1312.11 1308.63 1322.74 17 1323.54 1321.94 1321.44 1319.56 1311.92 1309.45 1322.76 18 1323.53 1321.90 1321.62 1319.44 1311.69 1309.79 1322.77 19 1323.53 1321.85 1321.58 1319.31 1311.50 1309.86 1322.83 20 1323.53 1321.83 1321.55 1319.19 1311.29 1309.78 1322.86 21 1323.51 1321.79 1321.65 1319.11 1311.10 1309.65 1322.81 22 1323.53 1321.73 1321.59 1318.95 1310.97 1310.36 1322.69 23 1323.52 1321.64 1321.53 1318.80 1310.82 1310.97 1322.57 24 1323.52 1321.56 1321.46 1318.64 1310.65 1314.96 1322.45 25 1323.51 1321.51 1321.37 1318.48 1310.48 1317.14 1322.31 26 --- 1323.59 1321.45 1321.28 1318.33 1310.36 1317.27 1322.14 --- 1323.68 1321.46 1321.16 1318.17 1310.22 1317.35 1321.97 28 --- 1323.63 1321,46 1321.06 1318.00 1310.14 1317.32 1321.82 29 1323.69 1323.62 1321.47 1320.95 1317.84 1309.98 1317.18 1321.72 30 1323.69 1321.49 1320.84 1317.69 A 1309.80 1317.03 1321.63 31 1323.72 1321.50 --- 1317.55 1309.61 1316.85 TOTAL --- 38383.76 40994.24 39636.04 40901.24 --- 40651.61 MEAN --- 1323.58 1322.39 1321.20 1319.39 --- 1311.34 MAX --- 1323.82 1323.62 1321.65 1320.79 --- 1317.35 MIN --- 1323.51 1321.45 1320.47 1317.55 --- 1308.63 A No gage-height record. 27 I RIO DE BAYAMON BASIN 13a 50047600 RIO DE BAYAMON NEAR AGUAS BUENAS, PR WATER-QUALITY RECORDS LOCATION.--Lat 18'14'39". long 66°08'49". at bridge on Highway 156. and 2.9 mi (4.7 km) west of Aquas Buenas plaza. DRAINAGE AREA.--18.5 i? (47.9 km?). PERIOD OF RECORD.--Water years 1958-65, 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1986 TO SEPTEMBER 1987 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND. FORM, TOCOCCI INST. C1FIC SOLVED CHEM- FECAL, FECAL. CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1987 16... 1010 36 260 7.60 25.0 4.4 8.0 99 <10 K400 940 DEC 02... 1410 28 200 7.40 25.0 45 7.4 91 32 830 1100 FEB 1988 11... 1330 38 255 7.80 24.0 8.6 104 490 470 APR 05... 1550 31 260 7.40 24.0 8.8 7.5 91 37 360 560 JUN 14... 1410 30 270 7.50 29.5 5.5 8.1 102 41 200 590 AUG 11... 1230 E60 230 8.40 27.0 8.0 9.1 117 10 2000 K150 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SIUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1987 16... 99 3 23 10 19 0.9 2.5 96 <0.5 6.4 17 DEC 02... 67 FEB 1988 11... 87 APR 05... 94 0 22 9.5 16 0.7 1.8 89 <0.5 8.4 16 JUN 14... 89 AUG 11... 82 0 19 8.5 17 0.8 2.1 87 11 15 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE 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 1987 16... 0.10 26 162 16 3 0.29 0.01 0.30 0.02 0.28 DEC 02... 18 1.47 0.13 1.60 0.33 0.27 FEB 1988 11... 9 <0.01 0.50 <0.01 APR 05... 0.20 25 158 13 7 0.27 0.03 0.30 0.01 0.29 JUN 14... <1 <0.01 0.20 <0.01 AUG 11... 0.10 22 147 11 0.24 0.06 0.30 0.15 0.05 K = non-ideal count E = estimate 140 RIO DE BAYAMON BASIN 50047600 RIO DE BAYAMON NEAR AGUAS BUENAS, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 19u/ TO SEPTEMBER 1988 CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) NITRO- OCT 1987 16... 0.3 0.6 2.7 0.05 1 100 <10 1 10 <10 DEC 02... 0.6 2.2 9.7 0.29 - FEB 1988 11... 0.3 0.04 APR ,1 05... 0.3 0.6 2.7 0.05 <1 <100 <10 <1 <10 JUN 14... 0.5 0.7 3.1 0.03 AUG 11... 0.2 0.08 METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE MANGA- 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 1987 16... 680 <5 30 <0.10 2 <1 <10 <0.010 5 0.02 DEC 02... FEB 1988 11... - APR 05... 1200 <5 70 <0.10 <1 <1 10 <0.010 1 0.03 JUN 14... AUG 11... 141 RIO DE BAYAMON BASIN 50047990 RIO GUAYNABO NEAR BAYAMON, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°22'32", long 66'07'59", at bridge on Highway 833. 0.2 mi (0.3 km) upstream from Rio de Bayamon, and 2.3 mi (3.7 km) southeast of Bayamon plaza. DRAINAGE AREA.--73.2 mi' (189.6 km2 ). PERIOD OF RECORD.--Water years 1958, 1964, 1971-73, 1976, 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 DIS- OXYGEN, OXYGEN COL1- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOIVFO CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1987 13... 1140 17 435 7.20 29.5 1.8 5.2 68 K67000 2400 DEC 04... 1240 34 404 7.10 27.5 4.4 5.6 70 24 K6700 1000 FEB 1988 18... 0905 29 411 6.90 23.0 6.6 76 K13000 K1800 APR 22... 0810 30 475 6.80 25.0 1.4 4.5 54 <10 45000 5100 JUN 10... 0935 11 465 6.90 28.5 4.5 6.2 78 22 K12000 2900 AUG 08... 1350 19 414 6.80 31.0 16 6.4 86 63 K16000 2300 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- UNITY CHLO- NESS NONCARB CALCIUM SLUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT 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 1987 13... 150 0 39 12 26 1 3.6 160 <0.5 14 32 DEC 04... 140 FEB 1988 18... 150 APR 22... 170 2 45 13 27 0.9 3.2 150 <0.5 21 31 JUN 10... 160 AUG 08... 150 0 40 12 25 0.9 3.0 150 14 26 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, D1S- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE N020403 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER 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 1987 13... 0.20 29 252 12 17 0.23 0.07 0.30 1.20 0.70 DEC 04... 12 0.70 0.10 0.80 0.46 0.54 FEB 1988 18... 9 0.62 0.08 0,70 0.17 0.63 APR 22... 0.20 27 266 22 21 0.34 0.06 0.40 0.78 0.62 JUN 10... - 8 0.41 0.09 0.50 0.25 0.55 AUG 08... 0.20 26 236 12 31 0.52 0.08 0.60 0.25 0.55 K = non-ideal count 142 RIO DE BAYAMON BASIN 50047990 RIO GUAYNABO NEAR BAYAMON, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1987 13... 1.9 2.2 9.7 0.55 2 100 50 <1 11 10 DEC 04... 1.0 1.8 8.0 0.23 FEB 1988 18... 0.8 1.5 6.6 0.23 - APR 22... 1.4 1.8 8.0 0.29 <1 100 ,10 <1 -1 <10 JUN 10... 0.8 1.3 5.8 0.33 - AUG 08... 0.8 1.4 6.2 0.27 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 1987 13... 820 <5 390 -0.10 -1 <1 <10 -0.010 8 0.06 DEC 04... FEB 1988 18... APR 22... 790 <5 340 <0.10 <1 <1 10 <0.010 1 0.06 JUN 10... AUG 08... I RIO DE BAYAMON BASIN 143 50048510 RIO DE BAYAMON AT FLOOD CHANNEL. AT BAYAMON. PR WATER-QUALITY RECORDS LOCATION.--Lat 18°24'29", long 66'09'04", at bridge on Highway 890. 1.0 (1.6 km) downstream fro bridge on High- way 2, and 3.2 mi (5.1 km) above mouth. DRAINAGE AREA.--71.9 mil (186.2 km'). PERIOD OF RECORD.--Water years 1974 to current year. REMARKS.--Prior to 1979 sampling site was 0.8 mile (1.3 km) downstream but was changed because of flood channel construction. WATER-QUALITY DATA. WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND, FORM. TOCOCCI INST. CIFIC SOLVED CHEM- FECAL. FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1987 05... 1255 40 392 7.30 30.5 14 6.2 82 29 K17000 K450 DEC 03... 1155 75 388 7.10 26.5 28 6.1 75 26 22000 3900 FEB 1988 05... 1300 162 313 6.90 24.5 6.6 79 89000 4900 APR 08... 1240 46 428 6.90 29.5 110 4.8 63 23 29000 4700 JUN 03... 1215 41 435 6.80 31.5 2.1 6.0 82 150 K97000 K290 AUG 08... 1240 38 383 7.20 32.0 17 5.0 67 ,1G K14000 K600 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LIN1TY CHLO- NESS NONCARB CALCIUM SLUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT D1S- DIS- D1S- SORP- DIS- TOT FET SULFIDE DIS- D1S- (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 1987 05... 150 14 40 13 23 0.8 2.9 140 <0.5 18 26 DEC 03... 140 FEB 1988 05... 100 APR 08... 150 8 40 13 25 0.9 2.6 130 , 0.5 22 27 JUN 03... 140 AUG 08... 150 4 39 12 22 0.8 2.9 140 16 24 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) S102) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1987 05... 0.20 29 236 26 15 0.36 0.14 0.50 0.56 1.20 DEC 03... 61 0.74 0.06 0.80 0.11 0.29 FEB 1988 05... 0.76 0.04 0.80 0.18 0.62 APR 08... 0.30 27 244 30 126 0.52 0.08 0.60 0.24 0.36 JUN 03... 15 0.15 0.05 0.20 0.10 0.10 AUG 08... 0.20 25 227 24 9 0.40 0.10 0.50 0.42 0.48 K = non-ideal count 144 RIO DE BAYAMON BASIN 50048510 RIO DE BAYAMON AT FLOOD CHANNEL AT BAYAMON, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM M1UM, COPPER, MON1A s NITRO- NITRO- PROS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABC: 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 1987 05... 1.8 2.3 6.8 0.32 1 <100 50 <1 3 10 DEC 03... 0.4 1.2 5.3 0.13 FEB 1988 05... 0.8 1.6 7.1 0.10 APR 08... 0.6 1.2 5.3 0.36 1 100 <10 <1 6 30 JUN 03... 0.2 0.4 1.8 0.20 AUG 08... 0.9 1.4 6.2 0.20 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 1987 05... 1600 <5 290 <0.10 2 <1 10 -0.010 6 0.05 DEC 03... - - FEB 1988 05... - - APR 08... 8500 5 490 <0.10 <1 <1 20 <0.010 <1 0.03 JUN 03... AUG 08... PESTICIDE ANALYSES CHLOR- DI- Dl- ENDO- PCB, ALDRIN, DANE, DDD, DDE, DDT, AZINON, ELDRIN SULFAN, DATE TIME TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN 1988 03... 1215 <0.10 <0.01 <0.10 <0.01 <0.01 <0.01 0.06 <0.01 <0.01 HEPTA- METH- METHYL METHYL HEPTA- CHLOR MALA- OXY- PARA- TRI- ENDRIN, ETHION, CHLOR, EPDXIDE L1NDANE THION, CHLOR, THION, THION, MIREX, DATE TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN 1988 03... <0.01 <0.01 <0.01 <0.01 <0.01 0.01 <0.01 <0.01 <0.01 <0.01P NAPH- THA- LENES, PARA- POLY- PER- TOX- TOTAL THION, CHLOR. THANE APHENE, TRI- 2,4-D, 2,4,5-T 2, 4-DP SILVEX, DATE TOTAL TOTAL TOTAL TOTAL THION TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN 1988 03... <0.01 <0.1 <0.10 <1 <0.01 <0.01 <0.01 <0.01 <0.01 RIO PUERTO NUEVO BASIN 145 50048770 RIO PIEDRAS AT EL SENORIAL, PR LOCATION.--Lat 18'21'51", long 66'03'56", Hydrologic Unit 21010005,on right bank, in the Riberas del Senorial Housing area, 0.6 mi (1.0 km) west of Highway 176 and 2.7 mi (4.3 km) southwest of Rio Piedras Plaza. DRAINAGE AREA.--7.49 mi' (19.4 km'). WATER-DISCHARGE RECORDS PERIOD OF RECORDS.--March 1988 to September 1988. GAGE.--Water-stage recorder. Elevation of gage in 98.4 ft (30.0 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. EXTREMES FOR CURRENT PERIOD.--Maximum discharge, 4,680 ft 3/s (132 m'/s), Aug. 24, gage height, 16.08 ft (4.901 m), from rating curve extended above 200 ft'/s (5.66 m'/s) on basis of step-backwater analysis; minimum discharge, 4.8 ft'/s (0.14 m'/s), Aug. 9. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,000 ft'/s (28.3 m'/s) and maximun (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (W/s) (ft) (m) Date Time (ft'/s) (m'/s) (ft) (m) Apr. 14 2230 2,530 71.6 13.21 4.026 Aug. 24 1500 *4,680 132 *16.08 4.901 May 9 1415 1,950 55.2 12.20 3.709 Sept. 1 1430 1,030 29.2 10.10 3.078 May 10 1730 1,330 37.7 10.87 3.313 Sept. 11 1130 1,560 44.2 11.40 3.475 Minimun discharge, 4.8 ft'is (0.14 m'/s), Aug. 9. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 9.5 7.6 8.7 15 7.0 110 2 9.2 7.2 8.1 10 6.4 33 3 7.8 7.1 7.9 8.0 17 22 4 8.4 6.8 7.6 8.8 9.3 19 8.3 7.0 7.4 13 6.9 17 5 7.8 6.8 7.2 9.7 6.0 16 7 9.4 6.5 7.1 22 13 17 8 9.0 6.4 7.0 7.3 6.7 48 9 7.7 160 7.6 7.8 7.5 e70 10 7.5 132 7.2 7.6 53 27 6 11 9.9 47 11 7.7 17 237 12 14 17 13 8.4 9.7 68 13 9.8 13 10 11 8.6 30 14 156 14 9.6 18 17 e47 15 85 11 14 7.9 10 e45 16 23 10 9.6 7.2 20 e35 17 34 9 6 8.8 35 21 e25 18 84 9 7 8.7 26 12 e18 19 61 11 8.9 12 8.9 e19 20 21 11 14 8.2 8.6 e14 21 15 12 36 7.1 8.4 ell 22 13 12 15 11 13 e130 11 e7.8 9.0 11 28 e35 24 --- 20 e7.0 15 9.2 251 CO 25 23 25 12 e6.8 9.3 8.1 56 e17 26 25 11 9.1 8.4 8.4 28 e13 27 36 9.2 7.7 7.7 6.6 53 e12 28 36 8.1 8.1 8.8 8.0 28 e10 29 53 7.9 8.8 7.2 17 23 e9.2 30 46 7.6 9.7 6.8 15 15 e9.0 31 13 --- 8.7 --- 8.1 39 --- 697.1 597.4 303.6 362.1 810.0 1183.2 TOTAL 23.2 19.3 10.1 11.7 26.1 39.4 MEAN 160 36 35 251 237 MAX 156 7.5 6.4 5.8 6.6 6.0 9.0 AC-FT 1380 1180 602 MIN 718 1610 2350 3.10 2.57 1.35 1.56 3.49 5.27 IN. CFSM 3.46 2.97 1.51 1.80 4.02 5.88 e Estimated 146 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 Ali' (20.9 km'). PERIOD OF RECORD.--Water years 1972 to current year. WATER QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL. CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1987 13... 0805 10 345 7.90 25.0 15 4.8 58 36 29000 K13000 DEC 04... 1100 12 375 7.30 26.0 25 6.8 83 30 370000 97000 FEB 1988 17... 0830 16 387 7.20 22.0 6.8 77 690000 800000 APR 25... 0930 12 370 7.90 25.0 81 6.7 80 13 140000 K110000 JUN 13... 0920 9.2 372 7.70 26.0 170 6.1 75 41 K91000 63000 AUG 10... 0835 6.6 393 6.80 24.0 780 7.7 90 <10 K90000 53000 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SLUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1987 13... 120 0 30 11 23 0.9 2.9 120 <0.5 13 24 DEC 04... 140 FEB 1988 17... 140 APR 25... 130 5 34 12 22 0.9 2.4 130 <0.5 19 25 JUN 13... 1:' AUG 10... 140 4 36 12 29 1 2.2 130 18 25 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1987 13... 0.20 29 205 5.8 10 0.72 0.08 0.80 0.30 0.90 DEC 04... 33 0.85 0.05 0.90 3.1 2.5 FEB 1988 17... 0.76 0.04 0.80 3.6 0.70 APR 25... 0.20 28 220 7.2 147 0.76 0.04 0.80 0.47 0.33 JUN 13... 248 0.58 0.12 0.70 0.67 0.53 AUG 10... 0.10 31 234 4.2 642 0.66 0.04 0.70 0.41 0.29 K = non-ideal count RIO PUERTO NUEVO BASIN 50048800 RIO PIEDRAS NEAR RIO PIEDRAS, PR--Continued WATER QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 NITRO- CHRO- GEN,AM- BARIUM. BORON. CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1987 13... 1.2 2.0 8.9 0.24 1 100 70 <1 5 10 DEC 04... 5.6 6.5 29 1.70 FEB 1988 17... 4.2 5.0 11.6 0.60 APR 25... 0.8 1.6 7.1 0.10 15 100 <10 1 1 20 JUN 13... 1.2 1.9 8.4 0.19 AUG 10... 0.7 1.4 6.2 0.34 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) CH) (UG/L) (MG/L) OCT 1987 13... 1300 <5 100 <0.10 2 <1 <10 <0.010 9 0.04 DEC 04... FEB 1988 17... APR 25... 6700 27 240 <0.10 <1 <1 30 <0.010 <1 0.03 JUN 13... AUG 10... PESTICIDE ANALYSES CHLOR- DI- DI- ENDO- PCB, ALDRIN, DANE, DDD, DOE, DDT, AZINON, ELDRIN SULFAN, DATE TIME TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN 1988 13... 0920 <0.10 <0.01 <0.10 <0.01 <0.01 <0.01 0.04 <0.01 <0.01 HEPTA- METH- METHYL METHYL HEPTA- CHLOR MALA- OXY- PARA- TRI- ENDRIN, ETHION, CHLOR, EPDXIDE LINDANE THION, CHLOR, THION, THION, MIREX, DATE TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN 1988 13... <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 NAPH- THA- LENES, PARA- POLY- PER- TOX- TOTAL THION, CHLOR. THANE APHENE, TRI- 2,4-D, 2,4,5-T 2, 4-DP SILVEX, DATE TOTAL TOTAL TOTAL TOTAL THION TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN 1988 13... <0.01 <0.1 <0.10 <1 <0.01 <0.01 <0.01 <0.01 <0.01 147 I I I I 148 RIO PUERTO NUEVO BASIN 50049000 RIO PIEDRAS AT RIO PIEDRAS, PR LOCATION.--Lat 18'23'48", long 66'03'24", Hydrologic Unit 21010005, on left bank, at bridge on Highway 1, 0.3 mi (0.5 km) southwest of the plaza in Rio Piedras, and 0.4 mi (0.6km) downstream from diversion for water supply. DRAINAGE AREA.--12.5 m' (32.4 km 2 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--October 1958 (maximum discharge measurement only), 1959-64 (annual low-flow measurements only), July 1971 to September 1982, October 1987 to September 1988. GAGE.--Water-stage recorder. Elevation of gage is 50 ft (15.2 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharges which are poor. Low flow affected by diversions for water supply. AVERAGE DISCHARGE.--12 years (1972-82,1988), 28.1 ft'/s (0.796 m 3 /s), 30.53 in/yr (775 mm/yr), 20,360 acre-ft/yr (25.10 hm'/yr); median of yearly mean discharges, 25 ft'/s (0.71 '/s), 18,100 acre-ft/yr (22 hm'/yr). '/s), Dec. 11. 1975, gage height. 21.02 ft (6.407 m). from rating curve extended above 3,000 ft'/s (85.0 '/s) on basis of slope-area measurements; minimum daily, 0.26 ft'/s (0.007 3/s), May 19. 1977. EXTREMES FOR PERIOD OF RECORD.--Maximun discharge 10,000 ft'/s (283 EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 2,800 ft'/s (79.3 m'/s) and maximun (*): Discharge Gage height Discharge Gage height Date Time (W/s) (110/s) (ft) (m) Date Time (ft'/s) (81 3/s) (ft) (m) Apr. 14 2400 6,620 187 13.75 4.191 Aug. 24 1545 *9,570 271 *16.86 5.139 May 9 1545 5,650 160 12.66 3.859 Sept. 11 1200 3,210 90.9 9.43 2.874 May 10 1800 3,150 89.2 9.34 2.847 Sept. 22 1645 3.680 104 10.13 3.088 Minimun discharge, 5.2 ftl/s (0.147 m'/s), Apr. 6. DISCHARGE. CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 218 2 e18 15 55 76 48 20 16 24 13 14 13 45 3 e50 17 21 40 122 18 14 22 12 11 35 33 4 e30 17 14 32 56 17 15 20 12 12 19 26 5 e70 14 54 34 34 17 14 21 12 17 13 27 1 e14 18 103 159 102 18 17 24 13 24 14 6 e25 16 35 24 27 17 11 21 13 13 13 22 7 e18 15 316 24 22 18 15 21 13 108 23 24 8 e17 18 e290 21 22 16 14 21 17 12 14 83 9 e18 15 e30 19 22 17 13 485 15 11 17 126 10 e16 13 e25 20 20 15 11 276 14 11 167 60 11 e16 13 e22 23 20 14 14 121 19 11 30 417 12 e15 13 e20 20 27 18 18 43 26 12 16 88 13 e14 30 e19 29 25 15 13 26 23 14 11 47 14 e14 13 17 25 19 15 256 36 27 36 22 83 15 e25 8.1 54 19 30 14 408 22 35 14 14 79 16 e30 15 20 18 20 23 79 18 30 13 24 61 17 e50 55 15 21 21 25 100 18 20 61 35 40 18 e40 42 13 24 22 13 172 16 17 44 20 32 19 21 16 32 32 18 14 106 16 26 20 13 34 20 15 11 123 18 18 14 46 18 35 15 13 23 21 28 9.1 84 18 19 11 46 15 73 13 10 20 22 14 8.6 35 16 19 12 37 15 27 31 38 222 23 25 38 27 15 18 11 34 13 16 19 58 38 24 36 172 24 16 19 63 111 12 39 16 885 29 25 59 86 26 22 20 36 46 12 16 19 109 25 14 20 27 15 445 34 14 34 49 34 13 12 14 90 17 28 21 84 30 36 21 48 30 14 37 16 45 16 29 18 31 23 98 18 73 27 14 13 27 44 15 30 15 18 22 29 --- 67 27 15 12 28 27 15 31 19 --- 104 37 23 --- 14 --- 17 65 --- 26 18 133 53 15 19 53 40 14 17 48 TOTAL 784 1398.8 1740 994 882 784 1784 1420 651 690 1945 1985 MEAN 25.3 46.6 56.1 32.1 30.4 25.3 59.5 45.8 21.7 22.3 62.7 66.2 MAX 70 445 316 159 122 73 408 485 73 108 885 417 MIN 14 8.1 13 14 18 11 11 12 12 11 10 15 AC-FT 1560 2770 3450 1970 1750 1560 3540 2820 1290 1370 3860 3940 CFSM 2.02 3.73 4.49 2.57 2.43 2.02 4.76 3.66 1.74 1.78 5.02 5.29 IN. 2.33 4.16 5.18 2.96 2.62 2.33 5.31 4.23 1.94 2.05 5.79 5.91 WTR YR 1988 TOTAL 15057.8 MEAN 41.1 MAX 885 MIN 8.1 AC-FT 29870 CFSM 3.29 IN. 44.81 e Estimated 149 RIO PUERTO NUEVO BASIN 50049100 RIO PIEDRAS AT HATO REY, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°24'34", long 66'04'10", at bridge on Avenida Piniero at Expreso Las Americas, and 0.8 mi (1.3 km) southwest of Hato Rey. DRAINAGE AREA.--15.4 mi' (39.9 km 2 ). PERIOD OF RECORD.--Water years 1971 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 DIS- OXYGEN, OXYGEN COLT- STREP- CHARGE, SPE- DIS- DEMAND. FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1987 13... 1210 20 431 7.80 31.0 3.6 4.0 53 68 K610000 83000 DEC 04... 0815 31 416 7.10 25.0 4.7 5.6 68 58 220000 30000 FEB 1988 17... 1145 23 430 7.00 25.0 6.0 72 K110000 63000 APR 25... 1210 42 374 7.70 27.0 34 6.6 82 10 260000 200000 JUN 13... 1135 18 453 7.40 29.0 12 1.7 22 69 K1160000 910000 AUG 10... 1055 12 441 6.90 26.5 40 6.0 73 10 K86000 K1160000 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SLUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- D1S- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1987 13... 140 0 39 11 30 1 4.4 160 <0.5 16 31 DEC 04... 160 FEB 1988 17... 150 APR 25... 140 0 39 10 23 0.9 3.3 160 <0.5 21 24 JUN 13... 150 AUG 10... 150 2 40 12 30 1 3.0 160 15 30 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1987 13... 0.20 29 257 14 10 0.34 0.16 0.50 2.10 1.7 DEC 04... 13 0.58 0.12 0.70 1.10 0.60 FEB 1988 17... 0.82 0.18 1.00 1.70 1,0 APR 25... 0.20 21 225 25 44 0.72 0.08 .80 0.75 0.85 JUN 13... 12 0.40 0.10 0.50 4.90 1.4 AUG 10... 0.10 29 248 8.4 180 0.70 0.10 0.80 0.80 0.50 K = non-ideal count 150 RIO PUERTO NUEVO BASIN 50049100 RIO PIEDRAS AT HATO REY, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1986 TO SEPTEMBER 1987 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA • NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN. PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1987 13... 3.8 4.3 19 0.83 2 200 40 ,1 8 10 DEC 04... 1.7 2.4 11 0.35 FEB 1988 17... 2.7 3.7 16 0.60 APR 25... 1.6 2.4 11 0.33 <1 100 ,10 1 ,1 10 JUN 13... 6.3 6.8 30 1.30 AUG 10... 1.3 2.1 9.3 0.38 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 1987 13... 1000 7 170 0.10 2 <1 10 0.010 4 0.08 DEC 04... - FEB 1988 17... APR 25... 3600 8 210 0.10 <1. 1 30 <0.010 2 0.14 JUN 13... AUG 10... - I RIO PUERTO NUEVO BASIN 151 50049310 QUEBRADA JOSEFINA AT PINERO AVENUE LOCATION.--Lat 18°24'34", long 66'04'31", Hydrologic Unit 21010005, on right bank, 75 ft (23 m) downstream fro bridge at highway 17, Pinero Avenue, 1.6 mi (2.6 km), northwest from Rio Piedras Plaza, 0.8 mi (1.3 km) north from University of Puerto Rico Medical Center and 0.4 mi (0.64 km) upstream from confluence with Rio Piedras. DRAINAGE AREA.--19.0 mi' (49.2 km 2 ). WATER-DISCHARGE RECORDS PERI.OD OF RECORD.--February 1988 to September 1988. GAGE.--Water-stage recorder. Elevation of gage 13.1 ft (4.0 m), from topographic map. REMARKS.--Record fair. EXTREMES FOR CURRENT PERIOD.--Peak discharges greater than base discharge of 1,200 ft'is (34.0 mi/s) and maximun (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (m0/s) (ft) (m) Date Time (ft'/s) (40/s) (ft) (m) Apr. 14 2400 1,420 40.2 5.27 1.606 July 7 0245 1,320 37.4 5.11 1.557 Apr. 24 1400 1,830 51.8 5.86 1.786 Aug.24 1530 *3,420 96.8 *7.77 2.368 May 9 1330 1,720 48.7 5.71 1.740 Minimum discharge, 1.2 ft'/s (0.04 m'/s), Aug. 17. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 6.0 5.7 4.7 5.7 7.1 2.9 2.9 2 6.2 4.6 4.9 4.6 2.4 4.0 2.7 3 4.3 4.3 4.8 4.1 3.1 18 2.5 4 4.3 4.3 4.4 4.6 3.3 2.7 2.6 5 4.3 4.7 4.1 4.6 8.9 2.4 2.7 6 4.0 4.7 3.6 3.8 6.7 2.8 2.6 7 4.2 7.1 3.1 3.7 87 11 2.1 8 4.3 3.6 3.1 4.8 1.6 2.8 22 9 4.1 4.4 152 3.1 1.6 4.3 70 10 4.2 5.0 70 4.7 2.5 33 28 11 4.3 5.8 34 5.2 4.0 4.5 86 12 3.7 8.5 3.3 6.1 3.0 2.0 25 13 3.6 3.0 3.6 5.8 4.0 2.0 16 14 3.2 49 14 15 9.1 6.8 33 15 16 3.0 21 2.4 4.6 2.5 6.7 10 17 8.8 49 3.1 5.0 4.0 13 6.5 18 3.6 49 3.5 4.0 9.7 2.0 6.7 19 5.5 25 4.3 8.6 4.0 1.7 9.3 20 6.6 11 12 25 3.9 1.6 6.7 21 --- 4.3 7.0 2.6 7.9 3.9 2.6 8.6 22 2.7 4.3 8.0 3.4 2.0 10 17 21 23 5.0 4.6 9.1 6.7 1.9 1.7 7.4 5.1 24 4.9 22 92 7.3 7.1 -2.5 344 9.8 25 5.1 4.4 13 5.6 3.3 2.3 14 5.3 26 4.6 18 8.0 5.7 1.8 3.8 5.7 5.8 27 9.2 20 6.0 4.1 2.2 1.8 16 6.4 28 3.8 11 4.4 4.8 59 1.9 12 7.0 29 4.3 35 5.9 4.6 2.2 5.1 19 7.3 30 --- 8.9 6.1 5.5 2.0 5.5 2.5 7.6 31 3.6 --- 4.9 --- 2.8 7.0 --- TOTAL 227.4 620.2 392.3 216.7 212.3 573.5 430.3 MEAN 7.34 20.7 12.7 7.22 6.85 18.5 14.3 MAX 35 191 152 59 87 344 86 MIN 3.0 3.0 2.2 1.8 1.6 1.6 2.1 AC-FT 451 1230 778 430 421 1140 853 CFSM .39 1.09 .67 .38 .36 .97 .75 IN. .45 1.21 .77 .42 .42 1.12 .84 152 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 Cano de Martin Pena, and 650 ft (200 •) south of Isla Guachinango. DRAINAGE AREA.--Indeterminate. PERIOD OF RECORD.--Water years 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 DEPTH OXYGEN, COLI- STREP- ALKA- AT SPE- TRANS- DIS- FORM, TOCOCCI LINITY SAMPLE CIFIC PAR- SOLVED FECAL, FECAL, WAT WH LOC- CON- PH TEMPER- ENCY OXYGEN, (PER- 0.7 KF AGAR TOT FET ATION, DUCT- (STAND- ATURE (SECCHI DIS- CENT UM-MF (COLS. FIELD DATE TIME TOTAL ANCE ARD WATER DISK) SOLVED SATUR- (COLS./ PER MG/L AS (FEET) (US/CM) UNITS) (DEG C) (IN) (MG/L) ATION) 100 ML) 100 ML) CAC03 OCT 1987 23... 1000 1.00 21000 8.20 30.0 13.2 1.6 21 60000 25000 150 DEC 17... 1005 1.00 14700 8.20 27.5 18.0 8.4 106 K11000 K1800 120 FEB 1988 25... 1010 1.00 22000 9.00 26.5 14.4 9.0 112 K6500 K1600 120 APR 26... 1050 1.00 11500 8.90 28.0 14.0 9.9 126 K17000 K640 88 JUN 20... 1015 1.00 23000 8.90 29.0 10.0 7.3 93 5800 <100 120 AUG 19... 1045 1.00 22300 8.70 28.5 17.5 10.1 128 K1400 K100 110 RESIDUE NITRO- TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- GEN,AM- AT 105 GEN, GEN, GEN, GEN, GEN, MONIA + NITRO NITRO- PHOS- CARBON, DEG. C, NITRATE NITRITE NO2+1403 AMMONIA ORGANIC ORGANIC GEN, GEN, PHOROUS ORGANIC SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL DATE PENDED (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) AS NO3) AS P) AS C) OCT 1987 23... 6 0.02 <0.10 0.85 2.3 3.1 0.53 16 DEC 17... 8 0.03 <0.10 0.97 2.0 3.0 0.43 13 FEB 1988 25... 27 <0.01 <0.10 <0.01 1.9 0.47 30 APR 26... 30 0.12 0.08 0.20 1.50 0.9 2.4 2.6 12 0.33 25 JUN 20... 9 0.03 <0.10 0.11 1.8 1.9 0.26 17 AUG 19... 16 <0.01 <0.10 0.10 2.7 2.8 0.43 21 K = non-ideal count 153 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 ni (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 1987 TO SEPTEMBER 1988 DEPTH OXYGEN, COLI- STREP- ALKA­ AT SPE- TRANS- DIS- FORM, TOCOCCI LINITY SAMPLE CIFIC PAR- SOLVED FECAL, FECAL, WAT WH LOC- CON- PH TEMPER- ENCY OXYGEN, (PER- 0.7 KF AGAR TOT FET ATION, DUCT- (STAND- ATURE (SECCHI DIS- CENT UM-MF (COLS. FIELD DATE TIME TOTAL ANCE ARD WATER DISK) SOLVED SATUR- (COLS./ PER MG/L AS (FEET) (US/CM) UNITS) (DEG C) (IN) (MG/L) ATION) 100 ML) 100 ML) CAC03 OCT 1987 23... 1150 1.00 32000 8.20 31.0 16.6 2.4 32 32000 4100 140 DEC 17... 1215 1.00 27000 7.60 28.5 24.0 3.7 47 32000 2600 140 FEB 1988 25... 1200 1.00 29000 7.40 27.5 25.2 6.5 82 270000 2300 140 APR 26... 1145 1.00 13000 7.30 27.0 18.0 2.3 29 340000 23000 120 JUN 20... 1140 1.00 31000 7.90 29.5 29.6 2.8 36 K70000 3000 130 AUG 19... 1245 1.00 >50000 7.50 30.0 9.0 2.2 29 K150000 5600 130 RESIDUE NITRO- TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- GEN,AM- AT 105 GEN, GEN, GEN, GEN, GEN, MONIA + NITRO- NITRO- PHOS- CARBON, DEG. C, NITRATE NITRITE NO20403 AMMONIA ORGANIC ORGANIC GEN, GEN, PHOROUS ORGANIC SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL DATE PENDED (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) AS NO3) AS P) AS C) OCT 1987 23... 3 0.04 <0.10 1.00 0.9 1.9 0.28 11 DEC 17... 5 0.20 0.10 0.30 1.30 1.9 3.2 3.5 15 0.31 6.8 FEB 1988 25... 25 0.14 0.06 0.20 0.97 0.93 1.9 2.1 9.3 0.42 10 APR 26... 37 0.07 0.03 0.10 1.70 1.5 3.2 3.3 14 0.31 6.4 JUN 20... 6 0.03 <0.10 1.20 0.7 1.9 0.38 7.7 AUG 19... 8 0.02 <0.10 1.20 1.5 2.7 0.50 9.5 154 THIS PAGE WAS LEFT BLANK INTENTIONALLY 155 SAN JUAN A T C 0 (round LOIZA ALDEA Son *Jose O Coastal basin Coasfot basin RIO GRANDE N TRU I LO ALTO 't Rib Herrera basin Rib Piedras basin Droinoge boundary. Arena Rio Espiritu Santo basin Rib de Bayornab basin AGUAS BUENA GURABO CAGUAS JUNCOS de /03 ovobro SAN LORENZO LAS PIEDRAS 051180 Drainage boundary Rib de la Piata basin Ri'a Humacao basin EXPLANATION 5508 SURFACE—WATER STATION AND NUMBER 1,564 QUALITY—OF—WATER STATION AND NUMBER QUALITY—OF—WATER PARTIAL RECORD Ria Guayones basin V0575 STATION AND NUMBER .Ailt A 0222 WELL AND WELL NUMBER AYA6VEZ LAGUA 2 3 4 NILES I I I I I I I I I 1 2 3 4 3 6 StL08ETER3 Figure 18.--Rio Grande de Loiza basin. 156 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 ka) west-southwest of Carolina plaza. DRAINAGE AREA.--2.96 ail (7.67 km?). PERIOD OF RECORD.--Water years 1973 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- D1S- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1987 06... 1245 5.0 558 7.80 30.0 2.3 3.6 47 48 290000 3000 DEC 02... 1145 7.9 426 7.00 26.0 21 2.7 33 20 210000 8800 FEB 1988 11... 1210 5.7 776 7.00 26.5 4.4 0.6 7 34 K1500000 K1300000 APR 05... 1200 5.2 576 7.60 27.0 15 1.6 20 110 K600000 K600000 JUN 01... 1150 6.5 640 7.20 30.0 1.5 2.0 26 55 2300000 310000 AUG 09... 1125 2.6 512 6.60 28.5 2.2 0.8 10 34 K2300000 330000 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SLUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS 5) AS 504) AS CL) OCT 1987 06... 190 1 60 10 35 1 4.0 190 <0.5 23 54 DEC 02... 150 FEB 1988 11... - 190 APR 05... 180 0 54 9.8 49 2 3.8 200 <0.5 18 46 JUN 01... 170 AUG 09... 170 0 53 9.1 42 1 3.5 180 17 49 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) 5102) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1987 06... 0.20 25 325 4.4 4 0.79 0.11 0.90 0.65 0.55 DEC 02... - 29 0.83 0.07 0.90 0.51 0.89 FEB 1988 11... 2 0.17 0.13 0.30 3.30 1.7 APR 05... 0.20 25 327 4.6 <1 0.11 0.09 0.20 0.43 1.1 JUN 01... 11 0.09 0.11 0.20 2.60 2.3 AUG 09... 0.20 27 312 2.2 5 0.07 0.03 0.10 2.80 1.6 K = non-ideal count RIO GRANDE DE LOIZA BASIN 50050300 QUEBRADA BLASINA NEAR CAROLINA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM M1UM, COPPER, MONIA t NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1987 <1 06... 1.2 2.1 12 0.34 2 100 <10 1 20 DEC 02... 1.4 2.3 10 0.31 FEB 1988 11... 5.0 5.3 23 0.86 APR 05... 2.1 2.3 10 0.99 7 <100 <10 1 <1 10 JUN 01... 4.9 5.1 23 0.72 -- AUG 09... 4.4 4.5 18 0.79 METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LINE 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 MANGA- (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 1987 06... 400 <5 190 <0.10 <1 <1 10 <0.010 4 0.08 DEC 02... - FEB 1988 11... APR 05... 1500 <5 400 <0.10 <1 <1 30 <0.010 8 0.11 JUN 01... AUG 09... 157 --- RIO GRANDE DE LOIZA BASIN 158 50050900 RIO GRANDE DE LOIZA AT QUEBRADA ARENAS, PR LOCATION.--Lat 1807'10", long 65°59'22", Hydrologic Unit 21010005, at intersection of Highways 181 and 9990, 0.2 mi (0.3 km) upstream from confluence with Rio Emajagua and about 7.1 mi (11.4 km) southwest of San Lorenzo. DRAINAGE AREA.--6.00 mi' (15.54 km:). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--October 1977 to current year. GAGE.--Water-stage recorder. Elevation of gage is 640 ft (195 m), from topographic map. REMARKS.--Records fair. AVERAGE DISCHARGE.--11 years (1978-88), 31.4 fti/s (0.889 m'/s), 71.07 in/yr, (1,805 mm/yr), 22,750 acre-ft/yr (28.05 hm'/yr); median of yearly mean discharges, 29 ft'/s (0.82 m'/s), 21,000 acre-ft/yr (26 hm'/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 11,700 ft'/s (331 m'/s), Nov. 5, 1983, gage height, 14.78 ft (4.505 m), from rating curve extended above 500 ft'/s (14.2 m'/s) on basis of step-backwater analysis; minimum discharge, 2.8 ft'/s (0.079 m'/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 (ft7s) (m7s) (ft) (m) Date Time (ft'/s) (m)/s) (ft) (m) Nov.24 1800 2,770 78.4 9.03 2.752 Aug. 10 2015 2,010 56.9 8.21 2.502 Nov.27 0930 *6,510 184 *11.95 3.642 Aug. 24 1415 2,710 76.7 8.97 2.734 Nov.28 0815 2,390 67.7 8.64 2.633 Aug. 25 0700 2,330 66.0 8.57 2.612 Dec. 7 2315 4,380 124 10.44 3.182 Sept. 11 0815 3,500 99.1 9.71 2.960' July 2 0800 3,720 105 9.90 3.018 Minimum discharge, 4.2 ft'is (0.119 m'/s), Apr. 28, 29, May 5. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 20 13 38 54 19 11 7.7 22 6.0 168 23 26 2 12 12 78 31 29 11 7.7 7.0 6.2 892 19 23 3 30 11 30 33 39 10 7.5 5.9 6.5 54 29 20 4 20 39 25 39 19 9.9 7.6 5.1 6.6 34 23 19 5 22 110 23 31 23 9.9 7.5 4.6 6.2 26 17 18 6 13 46 42 27 16 9.9 7.7 23 6.1 39 17 17 7 11 25 629 24 14 9.9 7.7 7.3 6.1 95 18 20 8 9.7 20 263 23 13 9.6 7.1 5.5 6.7 26 16 17 9 9.9 18 57 25 15 9.1 6.7 4.9 6.7 26 17 34 10 9.4 15 42 27 15 8.9 6.0 6.1 6.6 43 228 90 11 8.6 14 39 33 13 8.8 5.8 7.7 7.5 28 96 566 12 8.3 13 32 26 21 8.8 5.9 15 6.9 23 37 263 13 7.8 12 27 29 30 8.7 5.6 6.3 9.2 21 24 106 14 25 12 25 23 15 9.1 5.3 6.3 22 44 20 79 15 59 11 24 19 14 8.5 11 6.8 173 21 20 54 16 55 17 20 18 14 8.3 8.1 7.5 48 18 24 42 17 131 15 19 17 13 8.3 6.5 11 15 18 33 35 18 346 19 17 16 13 8.1 6.5 9.3 14 29 34 30 19 53 14 18 15 12 7.6 5.6 8.1 37 22 20 75 20 26 12 21 14 19 13 5.2 20 39 18 18 31 21 20 11 23 14 13 8.6 5.2 30 49 15 16 25 22 16 11 44 14 12 7.8 5.0 11 62 29 229 24 23 15 16 20 14 12 7.5 4.8 8.4 42 28 63 22 24 15 958 17 13 15 7.4 4.8 7.0 24 16 451 20 25 18 136 16 14 12 9.8 4.8 6.4 19 15 225 18 26 22 271 17 14 17 10 5.2 6.8 39 23 53 17 27 15 1180 18 17 19 28 5,5 6.8 21 16 46 16 28 78 500 25 14 12 24 4,6 6.7 17 129 39 16 29 25 85 18 23 11 11 5.1 8.2 16 34 34 14 30 15 50 17 14 --- 9.4 4.7 8.8 70 113 34 14 31 15 --- 27 14 8.1 --- 7.0 --- 31 27 TOTAL 1130.7 3666 1711 689 489 320.0 188.4 296.5 794.3 2094 1950 1751 MEAN 36.5 122 55.2 22.2 16.9 10.3 6.28 26.5 67.5 62.9 9.56 58.4 28 892 MIN 7.8 11 16 13 11 7.4 4.6 4.6 6.0 15 16 14 AC-FT 2240 7270 3390 1370 970 635 374 588 1580 4150 3870 3470 CFSM 6.08 20.4 9.20 3.70 2.81 1.05 1.59 4.41 10.5 9.73 MAX 346 1180 629 54 39 11 30 173 451 566 1.72 11.3 IN. 7.01 22.73 10.61 4.27 3.03 1.98 1.17 1.84 4.92 12.98 12.09 10.86 CAL YR 1987 TOTAL 12444.6 MEAN 34.1 MAX 1180 MIN 5.7 AC-FT 24680 CFSM 5.68 IN. 77.16 WTR YR 1988 TOTAL 15079.9 MEAN 41.2 MAX 1180 MIN 4.6 AC-FT 29910 CFSM 6.87 IN. 93.50 159 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 1987 TO SEPTEMBER 1988 STREAMFLOW. SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) OCT, 14 1209 42.6 94 26.5 MAR. 02 1315 11.0 148 23.0 NOV, 13 1100 12.4 148 25.0 APR. 05 1045 7.81 148 24.0 DEC, 09 0812 61.1 114 23.0 MAY, 06 1139 78.1 134 24.0 JAN, 04 1108 55.4 131 23.0 JUN, 03 1330 6.63 153 28.0 FEB. 01 1252 16.3 143 23.5 JUL, 12 1315 23.12 130 27.0 I I I RIO GRANDE DE LOIZA BASIN 160 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 i2 (8.42 km 2 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--October 1984 to current year. GAGE.--Water-stage recorder. Elevation of gage is 459 ft (140 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 7,400 ft'is (210 m'/s), May 17, 1985, gage height, 14.58 ft (4.444 a), from floodmark, from rating curve extended above 400 ft 3 /s (11.3 m'/s) on basis of step-backwater analysis and slope-area measurement; minimum discharge, 0.46 ft'is (0.013 '/s), May 3, 1985. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,000 ft'/s (28.3 3 /s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (W/s) (e/s) (ft) (m) Date Time (W/s) (e/s) (ft) (m) Nov. 27 unknown 2,620 74.2 10.41 3.173 Aug. 24 1400 *2,910 82.4 10.76 3.280 Dec. 7 1630 2,810 79.3 10.65 3.246 Aug. 25 0715 1,350 38.2 8.77 2.673 July 2 0745 1,480 41.9 8.97 2.734 Minimum discharge, 1.2 ft'is (0.034 10/s), many days. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 2.4 2.8 7.0 28 3.6 6.8 1.8 1.4 1.5 28 2.6 5.3 2 1.6 2.2 34 13 3.6 14 1.8 1.4 1.4 192 2.3 4.4 3 2.7 1.9 5.9 7.8 6.8 4.9 1.9 1.2 1.4 11 4.2 3.6 4 2.4 2.1 5.1 7.5 3.8 3.8 1.9 1.2 1.4 4.9 3.9 3.1 5 1.7 5.1 4.1 9.4 4.1 3.3 1.8 1.2 1.3 3.5 3.0 2.7 6 1.5 4.2 6.6 9.4 3.7 3.1 2.1 4.7 1.3 10 2.7 2.5 7 1.7 2.8 457 7.7 3.4 3.0 2.0 1.8 1.2 52 4.6 2.5 8 1.3 2.2 168 7.8 3.4 3.0 1.9 1.4 1.3 5.0 4.0 2.4 9 1.4 2.0 32 8.1 3.6 2.8 1.9 1.4 1.6 3.6 2.9 6.0 10 1.4 2.0 19 6.9 3.5 2.6 1.8 16 1.8 5.7 75 6.9 11 1.3 1.9 13 9.0 3.4 2.5 1.7 2.5 1.4 6.0 16 156 12 1.3 3.4 9.4 7.7 8.9 2.3 1.7 1.6 1.3 4.2 5.8 62 13 1.2 2.0 7.8 9.0 20 2.4 1.7 1.5 1.8 3.6 4.0 24 14 2.7 1.7 6.7 7.0 3.3 2.5 1.5 1.5 2.2 5.4 3.3 15 15 13 1.6 6.4 5.4 3.1 2.0 3.7 2.0 15 3.2 3.1 10 16 21 12 5.7 4.7 3.0 2.0 2.4 1.4 12 2.9 5.6 7.7 17 61 4.1 5.3 4.3 2.9 1.9 4.6 1.4 2.7 2.9 15 5.7 18 167 2.9 4.8 3.8 2.9 2.0 2.5 1.3 1.8 11 23 4.8 19 24 2.3 5.8 3.6 2.8 1.9 1.7 1.4 1.6 4.7 5.4 16 20 7.0 2.0 10 3.4 3.1 2.1 1.6 2.2 15 3.2 4.0 5.0 21 4.1 1.9 8.1 3.3 2.7 2.1 1.5 1.9 10 2.7 3.4 3.9 22 3.2 1.9 40 3.1 2.5 1.9 1.4 1.6 5.6 5.1 9.2 3.3 23 2.8 8.9 11 3.1 2.6 1.9 1.5 1.5 2.4 3.1 4.8 3.0 24 2.7 e320 8.8 3.2 2.7 1.9 1.4 1.5 2.0 2.6 229 2.9 25 3.2 e24 7.0 3.2 2.8 2.0 1.4 1.4 18 2.5 113 2.6 18 2.4 27 10 e400 5.9 2.9 15 4.4 1.9 1.5 4.2 2.4 14 2.2 28 25 e100 6.6 2.9 4.3 2.4 1.4 1.4 2.5 3.7 18 2.1 26 3.6 e100 6.8 3.0 24 2.0 1.4 1.5 15 2.8 29 5.0 e35 5.7 3.5 3.6 1.9 1.2 1.8 2.2 7.7 13 2.0 30 3.2 e20 4.9 2.8 --- 1.9 1.2 3.0 2.4 4.0 8.6 1.8 31 2.9 --- 14 2.9 1.9 --- 1.7 --- 2.9 6.2 --- TOTAL 383.3 1072.9 932.4 197.4 153.1 93.2 56.3 67.3 133.3 402.3 627.6 371.8 MEAN 12.4 35.8 30.1 6.37 5.28 3.01 1.88 2.17 4.44 13.0 20.2 12.4 MAX 167 400 457 28 24 14 4.6 16 18 192 229 156 MIN 1.2 1.6 4.1 2.8 2.5 1.9 1.2 1.2 1.2 2.4 2.3 1.8 AC-FT 760 2130 1850 392 304 185 112 133 264 798 1240 737 CFSM 3.80 11.0 9.25 1.96 1.62 .93 .58 .67 1.37 3.99 6.23 3.81 IN. 4.39 12.28 10.67 2.26 1.75 1.07 .64 .77 1.53 4.60 7.18 4.26 CAL YR 1987 TOTAL 4009.3 MEAN 11.0 MAX 457 MIN 1.2 AC-FT 7950 CFSM 3.38 IN. 45.89 WTR YR 1988 TOTAL 4490.9 MEAN 12.3 MAX 457 MIN 1.2 AC-FT 8910 CFSM 3.78 IN. 51.40 e Estimated RIO GRANDE DE LOIZA BASIN 50051150 QUEBRADA BLANCA AT EL JAGUAL, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--JANUARY 1985 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURF DATE TIME INSTANTANEOUS DUCTANCE TURF (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) OCT, 05 1148 1.75 258 28.0 MAR, 03 1106 4.41 226 24.0 NOV, 18 1013 2.95 255 25.5 APR, 06 0930 1.90 287 24.5 DEC, 09 1217 29.8 172 26.0 MAY, 06 1431 7.09 260 28.0 JAN, 05 1100 9.06 227 24.5 JUN, 02 1050 1.42 283 27.8 FEB, 02 1024 3.81 245 23.0 JUL, 11 0933 6.97 221 26.0 181 RIO GRANDE DE LOIZA BASIN 162 50051150 QUEBRADA BLANCA AT EL JAGUAL, PR-Continued WATER-QUALITY RECORDS PERIOD OF RECORD.-- Water years 1985 to 1986 PERIOD OF DAILY RECORD.-- SUSPENDED-SEDIMENT DISCHARGE: October 1984 to September 1986. REMARKS.-- The suspended-sediment data included in this report is part of a 5-year hydrologic investigation conducted in the Rio Grande de Loiza Basin to account the amount of suspended- sediment transported to Lago Loiza, a water supply reservoir. The suspended-sediment data for May 17, 1985, October 6, 1985, May 8, 1986, and May 13, 1986 are estimated. EXTREMES FOR PERIOD OF DAILY RECORD.-- SEDIMENT CONCENTRATION: Maximum daily mean, 7,300 mg/L Oct.06, 1985; Minimum daily mean, 1 mg/L several days. SEDIMENT LOADS: Maximum daily mean, 25,800 tons (23,400 tonnes) May 17 , 1985; Minimum daily mean, 0.01 tons (0.01) tonne several days. EXTREMES FOR WATER YEARS 1985-86.-- Water suspeneded-sediment concentration (mg/L) suspended-sediment discharge (tons per day) Year maximum minimum maximum minimum 1985 6,720 (May 18) 1 (several days) 25,800 (May 17) 0.01 (several days) 1986 7,300 (Oct. 06) 1 (several days) 15,200 (Oct. 06) 0.01 (several days) SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) OCTOBER NOVEMBER DECEMBER 1 9.0 100 2.4 26 362 123 2.4 5 .03 2 8.0 95 2.1 69 994 582 15 252 68 3 16 224 34 265 4110 8870 4.1 7 .08 4 7.4 70 1.4 82 1110 276 2.8 4 .03 5 10 135 9.7 169 2480 1920 2.4 1 .01 6 7.0 100 1.9 160 2240 1270 2.3 1 .01 7 8.0 100 2.2 105 1350 471 2.5 1 .01 8 6.0 70 1.1 55 731 125 3.5 3 .03 9 55 795 744 35 450 43 3.9 2 .02 10 10 80 2.2 21 400 23 4.1 2 .02 11 8.0 60 1.3 11 150 4.5 14 229 78 12 7.0 70 1.3 8.2 40 .89 4.5 400 4.9 13 22 325 73 7.2 20 .39 3.1 18 .15 14 95 1540 2000 14 134 12 2.6 28 .20 15 8.1 100 2.2 13 144 7.7 2.4 22 .14 16 20 336 118 8.0 20 .43 2.2 19 .11 17 14 250 9.5 7.0 3 .06 2.0 8 .04 18 5.0 45 .61 6.1 3 .05 1.6 5 .02 19 4.5 28 .34 5.6 3 .05 1.7 5 .02 20 4.3 20 .23 5.0 3 .04 1.6 2 .01 21 4.2 20 .23 4.5 3 .04 1.6 4 .02 22 4.5 20 .24 4.3 3 .03 1.5 5 .02 23 5.0 18 .24 4.5 3 .04 1.4 5 .02 24 4.4 15 .18 3.8 3 .03 1.9 5 .03 25 9.0 46 .88 3.7 6 .11 3.4 30 .28 26 5.9 20 .32 4.4 30 .92 2.6 18 .13 27 5.5 15 .22 3.1 5 .04 2.9 16 .13 28 5.9 10 .16 2.8 5 .04 3.1 15 .13 29 5.6 8 .12 2.6 5 .04 2.0 14 .08 30 8.2 34 .95 2.5 5 .03 2.4 12 .08 31 6.4 25 .43 --- --- --- 1.9 11 .06 TOTAL 388.9 3011.45 1108.3 13730.43 103.4 152.81 163 RIO GRANDE DE LOIZA BASIN 50051150 QUEBRADA BLANCA AT EL JAGUAL, PR-Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) JANUARY FEBRUARY MARCH 1 5.9 88 11 1.1 5 .01 1.7 4 .02 2 4.7 74 1.3 1.0 5 .01 1.5 4 .02 3 2.5 6 .04 .96 4 .50 1.6 4 .02 4 2.3 4 .02 .92 4 .20 1.6 4 .02 5 1.8 3 .80 .92 4 .01 2.1 14 .12 6 1.8 3 .50 .90 4 .01 3.3 31 .32 7 1.7 3 .01 .85 4 .01 5.2 89 .77 8 1.5 3 .01 .89 4 .01 2.3 15 .09 9 1.4 3 .01 .99 3 .80 1.6 9 .50 10 1.6 3 .01 1.1 3 .70 1.2 9 .20 11 1.7 3 .01 1.2 3 .70 1.1 9 .20 12 1.8 3 .01 1.3 3 .70 1.0 9 .02 13 2.2 3 .02 1.5 3 .90 .94 9 .02 14 2.5 2 .90 1.8 3 .90 .87 9 .02 15 2.8 2 .80 2.0 3 .90 .81 8 .80 16 2.4 2 .50 1.9 3 .90 .78 8 .50 17 2.2 2 .01 1.7 3 .80 .19 8 .20 18 1.8 1 .90 1.6 3 .80 2.5 28 .46 19 1.6 1 .70 1.7 4 .02 1.1 12 .04 20 1.4 1 .50 1.5 4 .02 .86 12 .03 21 1.2 1 .30 1.1 4 .01 .84 12 .03 22 1.0 1 .20 .94 4 .01 .83 12 .03 23 1.1 1 .00 1.0 4 .01 .81 12 .03 24 1.1 1 .20 1.1 4 .01 .80 12 .03 25 .89 1 .80 1.1 4 .01 .77 10 .02 26 1.0 2 .01 1.2 4 .01 .78 10 .02 27 .96 2 .20 2.4 4 .03 .80 10 .02 28 1.0 3 .01 2.2 4 .02 .76 10 .02 29 .97 3 .50 --- --- --- 33 669 362 30 .99 4 .01 2.5 25 .17 31 1.0 4 .70 2.1 15 .09 TOTAL 56.81 20.98 36.87 9.01 76.84 366.83 APRIL MAY JUNE 1 1.5 10 .04 .79 4 .01 3.9 4 .04 2 1.6 6 .80 .69 4 .01 3.6 4 .04 3 1.7 5 .02 .67 4 .01 4.1 4 .04 4 1.7 4 .90 .61 3 .90 9.6 4 .10 5 1.6 4 .80 .60 3 .70 5.4 4 .06 6 1.6 4 .50 .58 3 .50 3.1 4 .03 7 1.5 4 .20 .55 3 .20 3.0 4 .03 8 1.2 4 .10 .51 3 .00 3.0 4 .03 9 1.0 4 .01 .63 3 .01 2.8 4 .03 10 .91 3 .70 .53 3 .00 2.8 4 .03 11 .86 3 .40 .56 2 .80 2.9 4 .03 12 .81 3 .01 1.5 22 .27 2.8 4 .03 13 .94 3 .01 1.6 20 .33 2.5 4 .03 14 .81 3 .01 12 181 13 2.4 4 .03 15 .83 3 .01 111 2790 2810 2.3 4 .02 16 .98 3 .01 16 225 15 2.1 4 .02 17 .87 3 .01 308 5780 25800 2.0 4 .02 18 1.0 5 .01 382 6720 15500 2.0 4 .02 19 .94 6 .02 40 90 9.7 2.0 4 .02 20 .68 3 .90 19 20 1.0 2.2 4 .02 21 .82 3 .50 12 5 .50 2.2 4 .02 22 .73 3 .30 12 5 .16 2.0 4 .02 23 48 807 489 11 4 .90 2.0 4 .02 24 11 206 25 9.0 4 .50 2.0 4 .02 25 35 641 442 6.3 4 .80 1.8 3 .90 26 4.4 50 .59 5.6 4 .50 1.8 3 .50 27 1.5 18 .07 5.1 4 .20 1.7 3 .01 28 1.0 7 .02 4.9 4 .05 1.7 2 .80 29 .97 4 .01 4.6 4 .05 1.7 2 .50 30 .89 4 .01 4.3 4 .05 1.6 2 .20 31 --- --- --- 4.1 4 .04 --- --- TOTAL 127.34 962.96 976.72 44156.19 83.0 3.66 184 RIO GRANDE DE LOIZA BASIN 50051150 QUEBRADA BLANCA AT EL JAGUAL, PR-Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) JULY AUGUST SEPTEMBER 1 1.8 2 .01 1.6 12 .05 3.0 20 .16 2 1.7 2 .01 1.7 12 .06 9.8 217 24 3 1.8 2 .01 1.7 11 .05 3.8 25 .26 4 1.9 2 .01 1.5 10 .04 2.6 20 .14 5 1.6 2 .01 1.5 10 .04 2.2 20 .12 6 1.4 2 .50 1.6 10 .04 2.1 20 .11 7 1.4 2 .70 1.6 10 .04 1.9 20 .10 8 1.4 3 .01 1.5 10 .04 8.0 109 9.0 9 1.3 3 .50 1.5 10 .04 4.5 40 .49 10 1.2 3 .90 1.5 10 .04 2.7 20 .15 11 1.4 4 .20 1.5 10 .04 2.8 20 .15 12 1.3 5 .02 1.6 12 .06 97 628 714 13 1.3 5 .30 3.0 29 .42 69 1030 337 14 1.2 6 .02 1.9 17 .09 25 280 19 15 7.4 119 6.8 1.7 16 .07 14 180 6.8 16 5.9 75 1.8 1.5 15 .06 7.5 70 1.4 17 7.5 111 4.7 1.4 15 .06 5.8 50 .78 18 2.4 30 .19 1.5 14 .06 4.6 45 .56 19 2.3 29 .70 1.4 14 .05 4.1 40 .44 20 12 175 12 1.4 13 .05 3.6 35 .34 21 4.0 6 .50 1.5 13 .05 3.4 30 .28 22 2.4 6 .04 1.4 13 .05 3.2 30 .26 23 2.3 6 .04 1.4 12 .05 3.4 30 .28 24 3.0 6 .05 1.3 12 .04 16 230 52 25 2.2 6 .04 1.4 11 .04 87 2980 4940 26 2.7 6 .50 1.5 11 .04 14 140 5.3 27 2.0 6 .80 16 299 32 7.7 80 1.7 28 2.9 17 .19 4.3 40 .46 9.9 138 6.8 29 2.3 15 .09 2.6 20 .14 6.3 70 1.2 30 1.9 14 .07 2.1 20 .11 5.4 50 .73 31 1.7 13 .06 2.4 30 .19 --- --- --- TOTAL 85.6 31.77 68.5 34.57 430.3 6123.55 YEAR 3542.58 68604.21 165 RIO GRANDE DE LOIZA BASIN 50051150 QUEBRADA BLANCA AT EL JAGUAL, PR-Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 DAY MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) OCTOBER NOVEMBER DECEMBER 1 2 3 4 5 6.3 15 11 23 31 63 200 118 276 423 1.2 23 4.6 29 46 15 10 8.6 8.0 10 170 110 95 88 110 6.9 3.0 2.2 1.9 3.0 4.8 4.6 4.6 4.4 7.1 1 1 1 1 38 .01 .01 .01 .01 1.6 6 7 8 9 10 434 237 70 20 15 7300 4120 774 150 120 15200 8320 287 8.1 4.9 8.0 7.2 6.7 6.5 6.2 88 65 65 65 60 1.9 1.3 1.2 1.1 1.0 5.5 4.8 4.4 4.4 4.9 3 1 1 1 1 .04 .01 .01 .01 .01 11 12 13 14 15 11 10 9.0 7.9 7.1 110 100 100 90 80 3.3 2.7 2.4 1.9 1.5 6.1 17 9.3 8.3 32 60 284 100 80 403 .99 32 2.5 1.8 82 5.0 5.4 4.4 4.2 4.2 1 1 1 1 1 .01 .01 .01 .01 .01 16 17 18 19 20 6.9 6.9 49 110 10 78 75 638 1540 112 1.5 1.4 84 457 3.0 15 14 48 15 13 200 184 681 77 30 8.1 14 304 3.8 1.1 4.0 3.9 4.0 4.0 4.3 1 1 1 1 1 .01 .01 .01 .01 .01 21 22 23 24 25 8.0 7.0 70 80 40 88 76 940 1090 510 1.9 1.4 178 235 55 15 9.1 8.0 7.0 6.4 146 40 30 30 25 13 .98 .65 .57 .43 4.0 3.8 3.8 3.9 3.9 1 1 1 1 1 .01 .01 .01 .01 .01 26 27 28 29 30 31 45 25 19 34 20 45 580 300 220 430 230 580 70 20 11 39 12 70 6.0 5.6 5.4 5.0 5.4 --- 25 20 20 18 15 --- .41 .30 .29 .24 .22 --- 3.7 3.6 3.7 3.5 3.4 3.4 1 1 1 1 1 1 .01 .01 .01 .01 .01 .01 TOTAL 1483.1 25175.8 336.8 490.88 133.6 1.93 166 RIO GRANDE DE EOIZA BASIN 50051150 QUEBRADA BLANCA AT EL JAGUAL, 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 3.8 1 .01 4.0 3 .03 2.1 1 .01 2 3.8 1 .01 3.1 1 .50 2.1 1 .01 3 3.5 1 .01 3.3 1 .01 2.0 1 .01 4 3.6 1 .01 5.6 35 1.8 1.8 1 .00 5 3.3 1 .01 4.5 3 .04 1.8 1 .00 6 3.1 1 .01 3.5 1 .01 1.8 1 .00 7 3.1 1 .01 3.2 1 .01 1.7 1 .00 8 3.3 1 .01 2.9 1 .01 1.7 1 .00 9 13 144 15 2.8 1 .01 1.7 1 .00 10 5.0 1 .50 2.7 1 .01 1.7 1 .00 11 3.7 1 .01 2.8 1 .01 1.8 1 .00 12 3.3 1 .01 2.7 1 .01 1.7 1 .00 13 3.1 1 .01 2.6 1 .01 1.9 1 .01 14 2.9 1 .01 2.5 1 .01 2.1 4 .08 15 2.9 1 .01 2.4 1 .01 3.4 26 .42 16 2.8 1 .01 2.4 1 .01 1.8 6 .03 17 4.7 24 .79 2.5 1 .01 1.6 3 .01 18 3.2 1 .50 2.7 1 .01 1.5 3 .01 19 2.8 1 .01 2.7 1 .01 1.5 3 .01 20 2.6 1 .01 2.4 1 .01 1.5 2 .70 21 2.8 1 .01 2.4 1 .01 1.4 2 .20 22 2.6 1 .01 2.2 1 .01 1.4 1 .50 23 2.5 1 .01 2.2 1 .01 1.4 1 .20 24 2.7 1 .01 2.2 1 .01 1.4 1 .00 25 2.4 1 .01 2.2 1 .01 1.6 1 .00 26 2.3 1 .01 2.2 1 .01 1.9 1 .01 27 2.2 1 .01 2.1 1 .01 1.6 1 .00 28 2.2 1 .01 2.2 1 .01 1.4 1 .00 29 6.3 66 4.8 --- --- 4.6 47 1.4 30 3.4 20 .18 2.3 7 .04 31 9.2 65 5.5 2.1 6 .03 TOTAL 116.1 27.51 79.0 2.61 58.3 3.68 APRIL MAY JUNE 1 2.3 5 .50 5.9 81 8.6 3.7 20 .20 2 1.8 5 .02 2.6 20 .14 3.8 20 .21 3 2.0 5 .03 2.1 17 .10 3.0 18 .15 4 5.3 77 4.5 1.9 14 .07 2.5 18 .12 5 5.3 51 1.1 1.8 10 .05 2.2 16 .10 6 3.6 30 .29 2.2 20 .12 2.1 16 .09 7 2.3 28 .17 3.6 25 .24 2.1 16 .09 8 3.2 30 .26 121 2850 7370 2.3 15 .09 9 2.9 30 .23 20 238 18 3.0 25 .20 10 2.0 4 .02 43 585 166 12 199 46 11 1.8 1 .50 47 661 131 2.5 25 .17 12 1.7 1 .30 13 15 .53 2.2 20 .12 13 1.6 1 .00 161 3740 12200 4.3 50 .58 14 1.5 1 .00 78 1710 6320 4.7 40 .51 15 1.6 1 .00 7.3 70 1.4 3.2 25 .22 16 1.7 1 .00 4.7 50 .63 3.0 6 .05 17 1.6 1 .00 4.0 50 .54 3.0 3 .02 18 1.4 1 .00 17 240 26 2.4 3 .02 19 1.4 1 .00 6.8 90 1.7 2.7 3 .02 20 1.6 1 .80 4.6 50 .62 2.2 3 .02 21 1.6 2 .01 4.0 35 .38 2.1 3 .02 22 1.4 2 .01 3.7 30 .30 2.0 3 .02 23 1.3 1 .90 2.8 28 .21 1.9 3 .02 24 1.3 1 .80 2.5 25 .17 1.9 3 .02 25 1.3 1 .80 2.2 20 .12 1.8 3 .01 26 1.3 1 .60 2.2 20 .12 1.8 3 .01 27 1.6 1 .50 2.1 20 .11 1.8 3 .01 28 2.4 10 .06 2.1 18 .10 1.8 3 .01 29 35 720 374 2.6 19 .13 1.8 3 .01 30 5.1 50 .69 2.1 19 .11 1.8 3 .01 31 --- --- --- 26 436 240 --- --- --- TOTAL 98.9 387.09 599.8 26477.49 85.6 49.12 187 RIO GRANDE DE 1011.4 BASIN 50051150 QUEBRADA BLANCA AT EL JAGUAL, 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/1) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) JULY AUGUST SEPTEMBER 1 1.8 3 .01 1.9 1 .70 3.1 30 .25 2 1.8 3 .01 1.9 1 .50 2.3 3 .02 3 1.9 3 .02 1.9 1 .50 1.8 2 .50 4 1.8 3 .01 1.9 1 .01 1.7 2 .01 5 1.8 3 .01 2.0 1 .50 1.6 1 .50 6 3.5 27 .70 2.0 1 .50 1.6 1 .00 7 2.2 5 .03 2.7 3 .04 1.5 0 .50 8 1.9 3 .02 2.5 4 .03 1.4 0 .50 9 1.8 3 .01 2.1 2 .20 1.4 0 .50 10 1.8 3 .01 3.6 17 .91 1.4 0 .80 11 2.5 3 .02 4.4 48 .83 1.3 1 .00 12 2.4 3 .02 2.5 25 .17 1.3 1 .00 13 1.9 3 .02 4.3 40 .46 1.5 3 .01 14 2.4 10 .06 3.5 30 .28 1.4 3 .01 15 2.1 4 .02 2.4 5 .03 1.3 2 .60 16 1.9 3 .50 2.1 3 .02 1.4 1 .00 17 1.8 3 .50 1.9 2 .80 1.3 1 .00 18 1.8 3 .20 1.8 2 .50 1.4 1 .00 19 1.9 3 .02 1.8 2 .50 1.3 1 .00 20 2.0 3 .02 1.6 2 .01 1.3 1 .00 21 2.2 3 .02 1.6 2 .01 1.4 1 .00 22 1.9 3 .02 1.8 2 .01 1.5 1 .00 23 1.8 3 .01 2.1 2 .01 1.7 1 .00 24 1.8 3 .01 1.9 2 .01 12 130 4.2 25 1.8 2 .80 1.8 2 .01 8.0 80 1.7 26 1.8 2 .50 1.8 2 .01 3.5 30 .28 27 1.8 2 .50 1.8 2 .01 2.5 20 .14 28 1.9 2 .20 5.9 86 3.3 1.8 1 .50 29 1.8 2 .20 77 1520 1410 1.7 1 .50 30 2.5 2 .01 4.1 45 .50 1.8 1 .50 31 2.2 1 .90 2.5 25 .17 --- --- --- TOTAL 62.5 5.38 151.1 1421.53 67.2 12.02 YEAR 3272.0 54065.04 168- RIO GRANDE DE LOIZA BASIN 50051180 QUEBRADA SALVATIERRA NEAR SAN LORENZO, PR LOCATION.--Lat 1810'24", 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•). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--January 1984 to current year. GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 330 ft (100 m), from topographic map. REMARKS.--Records fair except those for estimated daily dicharges, which are poor. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 9,320 ft'/s (264 m'/s), May 17, 1985, gage height, 17.10 ft (5.212 m), from floodmark, from rating curve extended above 200 ft'/s (5.66 m'/s) on basis of step-backwater analysis and slope-area measurement; minimum discharge, 0.69 ft'/s (0.020 m'/s), Apr. 9-13, 15, 16, 1984. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,000 ft'/s (28.3 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (m'/s) (ft) (m) Date Time (ftqs) (m'/s) (ft) (m) Nov. 27 0430 4,430 125 12.87 3.923 Aug. 24 1415 4,560 129 12.95 3.947 Dec. 7 1630 *4,740 134 *13.06 3.981 Minimum discharge, 0.87 ft'is (0.025 m'/s), May 5. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 el.2 el.9 20 24 3.6 e4.0 2.0 el.1 1.3 33 2.3 e6.0 2 el.2 el.7 26 15 3.5 e5.4 1.8 el.2 105 2.1 1.3 e5.4 3 el.4 el.6 21 8.1 5.6 e3.4 1.8 el.1 1.3 16 2.6 e5.4 4 el.3 el.7 19 7.6 2.8 e3.0 1.8 el.0 1.3 11 2.9 e5.2 5 el.2 e2.1 18 15 2.8 e2.8 1.6 el.1 1.2 10 2.0 e5.6 2.4 1.2 e6.0 6 1.1 e3.0 22 13 2.6 e2.6 2.9 11 1.9 7 1.1 e2.4 332 9.1 2.4 e2.5 el.8 1.3 1.2 e68 2.8 e6.4 2.4 e7.0 8 1.1 e2.0 e91 8.6 2.5 e2.3 e1.7 1.0 1.1 e19 9 1.1 el.6 e20 11 2.4 e2.2 el.7 1.0 1.6 e13 2.0 e10 12 34 10 1.1 el.5 9.9 9.6 2.6 e2.2 e1.6 2.2 e9.0 e7.0 2.3 1.4 e6.4 17 101 11 1.1 el.4 6.9 10 2.4 e2.3 e1.6 1.4 4.2 6.2 75 12 1.1 e2.0 5.6 8.6 4.1 e2.4 el.7 1.4 21 13 1.1 el.5 4.8 7.7 13 e2.7 e1.7 1.3 1.8 3.3 4.3 14 1.4 el.4 4.4 7.1 e2.7 e2.2 el.6 1.3 1.7 4.5 3.5 9.8 15 1.6 el.3 4.4 5.5 e2.5 e2.0 e5.7 1.4 11 2.7 3.3 7.6 16 3.1 e4.0 4.1 4.4 e2.3 1.9 e2.3 1.1 6.3 2.3 5.0 6.2 17 25 e2.6 3.8 3.8 e2.2 1.8 e13 1.1 2.6 2.2 8.4 5.1 18 102 e2.1 3.6 3.8 e2.2 1.7 e2.8 1.1 1.8 20 4.5 4.5 19 20 1.7 4.5 3.5 e2.1 1.8 e2.2 1.2 1.6 3.7 5.2 19 20 4.9 1.7 8.4 3.1 e2.1 2.2 el.9 2.6 4.4 2.6 4.0 6.3 21 3.6 1.6 6.3 3.0 e2.0 1.9 el.7 2.3 3.9 2.2 3.4 4.8 22 e3.2 1.6 15 2.9 e1.9 1.8 el.6 1.5 3.1 10 6.2 4.4 23 e2.9 3.8 6.4 2.9 e2.0 1.7 el.5 1.4 2.6 3.4 5.3 e4.3 24 e2.7 247 5.8 2.8 e2.1 1.8 el.4 1.3 2.6 2.7 155 e4.0 25 e2.8 24 5.0 2.6 e2.1 2.0 el.3 1.2 31 e87 2.5 e3.8 26 e2.9 96 4.9 2.6 e16 1.9 el.4 1.2 25 5.2 e17 e3.6 27 3.2 472 4.1 2.8 e14 2.9 el.3 1.2 18 3.1 9.9 e3.5 28 15 58 4.1 2.7 e3.3 2.0 el.2 1.2 12 3.7 10 e3.3 1.9 4.9 e3.1 30 e2.4 25 3.8 2.9 --- 2.3 el.1 2.3 3.7 e7.2 29 4.0 35 3.9 2.8 e2.8 el.1 1.4 11 8.3 10 e2.9 31 e2.0 --- 17 2.9 2.2 1.6 2.6 --- e6.4 --- 375.4 447.6 357.2 MEAN 7.03 33.4 22.8 6.75 3.88 2.38 2.21 1.78 5.56 12.1 11.9 TOTAL 217.8 1003.2 705.7 209.4 112.6 73.8 66.3 55.1 166.9 14.4 MAX 102 472 332 24 16 5.4 13 12 31 105 155 101 MIN 1.1 1.3 3.6 2.6 1.9 1.7 1.1 1.0 1.1 2.2 1.9 2.9 AC-FT 432 1990 1400 415 223 146 132 109 331 745 888 709 CFSM 1.88 8.94 6.09 1.81 1.04 .59 .48 1.49 .64 3.24 3.86 3.18 IN. 2.17 9.98 7.02 2.08 1.12 .73 .66 .55 1.66 3.73 4.45 3.55 CAL YR 1987 TOTAL 3122.99 MEAN 8.56 MAX 472 MIN .95 AC-FT 6190 CFSM 2.29 IN. 31.06 WTR YR 1988 TOTAL 3791.0 MEAN 10.4 MAX 472 MIN 1.0 AC-FT 7520 CFSM 2.77 IN. 37.71 e Estimated RIO GRANDE DE LO1ZA 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 1987 TO SEPTEMBER 1988 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) OCT, 05 1412 1.15 371 28.0 MAR, 03 1323 3.37 287 24.0 NOV, 18 1151 2.07 350 26.0 APR, 06 1046 1.81 426 26.5 DEC, 09 1350 20 213 25.5 MAY, 05 1239 1.01 417 30.5 JAN, 05 1258 34.9 242 23.5 JUN, 02 1322 1.26 388 28.0 FEB, 02 1228 3.85 366 23.0 JUL, 11 1204 5.40 265 27.0 169 RIO GRANDE DE LOIZA BASIN 170 50051180 QUEBRADA SALvAT1ERRA NEAR SAN LORENZO, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORD.-- Water years 1984 to 1986 PERIOD OF DAILY RECORD.-- SUSPENDED-SEDIMENT DISCHARGE: January 1984 to September 1986. REMARKS.-- The suspended-sediment data included in this report is part of a 5-year hydrologic investigation conducted in the Rio Grande de Loiza Basin to account the amount of suspended- sediment transported to Lago Loiza, a water supply reservoir. EXTREMES FOR PERIOD OF DAILY RECORD.-- SEDIMENT CONCENTRATION: Maximum daily mean, 2,570 mg/L May 17, 1985; Minimum daily mean, 1 mg/L several days. SEDIMENT LOADS: Maximum daily mean, 15,500 tons (14,060 tonnes) May 17, 1985; Minimum daily mean, 0.01 tons (0.01) tonne several days. EXTREMES FOR WATER YEARS 1984-86.-- Water suspeneded-sediment concentration (mg/L) suspended-sediment discharge (tons per day) Year maximum minimum maximum minimum 1984 2,350 (Jun. 10) 1 (several days) 15,400 (Jun. 10) 0.00 (several days) 1985 2,570 (May 17) 1 (several days) 14,060 (May 17) 0.01 (several days) 1986 2,430 (Oct. 06) 0 (several days) 12,300 (May 14) 0.00 (several days) SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 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 2.0 1.7 3 .60 1.6 4 .02 2 1.8 - 1.5 3 .20 1.6 4 .02 3 1.7 - 1.5 3 .01 1.6 3 .90 4 1.6 1.9 3 .02 1.5 3 .60 5 1.5 1.6 3 .01 1.5 3 .20 6 1.5 - 1.5 3 .01 1.5 3 .20 7 1.5 1.5 3 .01 1.5 3 .20 8 1.5 1.5 3 .01 1.4 3 .20 9 1.6 1.9 3 .20 1.4 3 .20 10 1.8 4.2 4 .05 1.4 3 .20 11 1.6 3.7 4 .50 1.3 3 .01 12 3.2 --- --- 8.8 61 15 1.3 3 .01 13 14 89 16 33 152 32 1.3 3 .01 14 12 30 .97 11 75 2.2 1.4 2 .50 15 3.8 14 .14 106 1040 2250 1.3 2 .50 16 2.6 4 .02 88 593 1020 1.2 2 .50 17 2.0 4 .02 6.6 25 .45 1.2 2 .50 18 1.7 3 .01 3.3 10 .09 1.2 2 .50 19 1.7 2 .01 2.3 6 .04 1.2 2 .20 20 14 72 7.8 1.9 5 .03 1., 2 .01 21 3.5 10 .09 1.7 4 .50 1.1 2 .01 22 1.8 4 .01 1.6 4 .02 1.1 2 .01 23 1.7 3 .80 1.6 4 .02 1.2 2 .01 24 1.8 3 .80 1.6 4 .02 1.2 2 .01 25 1.8 3 .80 1.6 4 .02 1.1 2 .01 26 1.7 3 .80 1.6 4 .02 1.0 2 .01 27 1.7 3 .80 1.7 4 .02 1.0 2 .01 28 1.9 3 .70 1.7 4 .02 .97 2 .01 29 1.7 3 .70 1.6 4 .02 .96 2 .01 30 1.6 3 .60 --- --- --- .91 1 .80 31 1.6 3 .60 .88 --- --- TOTAL 93.9 31.67 298.1 3322.09 38.92 6.37 171 RIO GRANDE DE LOIZA BASIN 50051180 QUEBRADA SALVATIERRA NEAR SAN LORENZO, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE ?RATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (IONS/DAY) (CFS) (MG/L) (TONS/DAY) APRIL MAY JUNE .1 .86 1 .50 .96 1 .00 1.8 3 .50 2 .86 1 .40 .93 1 .00 1.5 2 .60 3 .86 1 .40 .97 1 .00 1.2 2 .20 4 .81 1 .60 1.0 1 .00 1.3 2 .01 5 .80 1 .60 .93 1 .00 1.2 2 .01 6 .82 1 .70 .93 1 .00 10 3 .02 7 .84 1 .50 .97 1 .00 26 189 29 8 .85 1 .50 1.0 1 .00 9.8 60 1.6 9 .74 1 .30 .97 1 .00 5.3 20 .29 10 .71 1 .30 1.1 1 .00 295 2350 1540c 11 .72 1 .20 1.2 1 .00 15 70 2.8 12 .71 1 .20 1.1 1 .00 7.0 30 .57 13 .72 1 .00 1.8 1 .00 20 112 14 14 .74 1 .00 2.1 1 .01 9.9 25 .67 15 .74 1 .00 1.4 1 .00 5.9 15 .24 16 .73 1 .00 1.3 1 .00 5.9 25 .40 17 .77 1 .00 1.2 1 .00 5.3 20 .29 18 .80 1 .00 1.1 1 .10 3.8 10 .10 19 .79 1 .00 1.1 1 .10 3.2 7 .50 20 .80 1 .00 1.1 1 .20 2.6 6 .04 21 .86 1 .00 1.1 1 .20 2.3 5 .50 22 .93 1 .00 1.0 1 .10 2.1 4 .80 23 .93 1 .00 1.1 1 .00 1.8 4 .50 24 .93 1 .00 1.1 1 .00 1.7 4 .02 25 .90 1 .00 2.0 1 .20 1.6 3 .50 26 .93 1 .00 14 55 14 1.8 3 .01 27 1.4 1 .00 2.1 4 .02 1.5 2 .50 28 1.7 1 .00 2.2 4 .02 1.4 2 .01 29 1.1 1 .00 1.5 4 .02 2.0 1 .80 30 1.0 0 .00 18 70 9.6 1.6 1 .50 31 --- --- 3.1 6 .50 --- --- TOTAL 26.35 5.20 70.36 25.07 449.5 --- 15455.98 JULY AUGUST SEPTEMBER 1 1.9 1 .30 4.1 15 1.7 2.2 5 .03 2 2.3 1 .01 6.2 --- --- 1.8 5 .02 3 1.4 1 .00 1.4 3 .01 1.7 5 .02 4 30 255 183 6.6 81 10 1.9 5 .03 5 64 345 102 2.3 5 .03 16 118 31 6 6.2 25 .42 1.3 2 .50 5.4 25 .36 7 2.8 7 .05 1.1 2 .01 2.7 7 .05 8 2.0 4 .50 .99 2 .01 2.1 5 .03 9 1.7 4 .02 .95 1 .80 2.2 7 .04 10 1.8 3 .60 .86 1 :50 2.6 8 .06 11 1.5 3 .01 .83 1 .30 2.3 7 .04 12 1.3 2 .50 .83 1 .20 4.7 26 .74 13 1.1 2 .01 .82 1 .20 19 126 28 14 1.5 2 .01 .82 1 .20 86 503 419 15 1.5 2 .01 .84 1 .20 10 60 1.6 16 1.2 2 .01 1.0 1 .20 11 60 1.8 17 1.1 2 .01 .92 1 .20 24 151 19 18 .97 2 .01 .89 1 .20 54 391 178 19 1.0 2 .01 .89 1 .10 41 198 31 20 1.1 2 .01 1.1 1 .10 95 657 520 21 1.6 2 .01 1.0 1 .10 38 150 15 22 1.3 2 .01 .87 1 .10 13 55 1 9 23 1.2 2 .10 .87 1 .10 7.3 25 .49 24 1.0 2 .50 .82 1 .10 5.2 20 .28 25 .98 3 .01 .84 1 .10 4.2 18 .20 26 1.1 3 .01 2.8 12 .09 3.7 15 .15 27 .98 4 .01 3.8 5 .05 3.4 12 .11 28 .99 3 .80 2.4 4 .03 3.7 12 .12 29 1.7 5 .02 1.7 3 .01 3.1 10 .08 30 2.3 8 .05 16 91 29 5.0 10 .14 31 1.3 3 .01 4.1 15 .17 --- --- --- TOTAL 140.82 289.02 69.94 45.31 472.2 1249.29 YEAR 1660.09 20430.00 172 RIO GRANDE DE LOIZA BASIN 50051180 QUEBRADA SALVATIERRA NEAR SAN LORENZO. PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) OCTOBER NOVEMBER DECEMBER 1 3.5 10 .09 6.2 24 .40 3.0 6 .05 2 3.0 7 .50 12 53 1.7 28 139 39 3 4.3 17 .37 60 360 58 7.0 27 .51 4 3.9 12 .13 20 100 5.4 4.3 12 .14 5 3.1 9 .08 246 981 825 3.7 10 .10 6 3.5 9 .09 158 1020 657 3.4 10 .09 7 2.7 7 .05 102 760 493 3.2 10 .09 8 2.7 7 .05 46 209 46 14 149 42 9 28 201 68 26 180 13 4.4 12 .14 10 7.9 25 .53 18 90 4.4 3.5 10 .09 11 4.3 13 .15 6.1 35 .58 2, 223 206 12 3.4 10 .09 4.1 35 .39 4.2 17 .19 13 22 200 75 3.1 35 .29 3.3 10 .09 14 98 709 678 7.3 64 3.7 3.3 10 .09 15 12 60 1.9 12 64 4.2 3.1 8 .07 16 7.3 30 .59 4.1 13 .14 3.3 8 .07 17 7.0 40 .76 3.4 7 .50 2.9 7 .05 18 4.5 14 .17 3.2 4 .03 2.5 6 .50 19 3.3 9 .10 2.9 3 .02 2.7 7 .05 20 3.2 7 .06 2.6 2 .01 2.7 6 .50 21 3.1 9 .08 2.5 2 .01 2.5 6 .04 22 3.2 10 .09 2.7 2 .01 2.4 6 .04 23 2.4 6 .50 4.0 15 .16 2.4 5 .80 24 2.1 6 .03 2.8 5 .04 3.0 6 .05 25 7.2 57 4.5 2.9 5 .04 4.7 8 .10 26 2.5 6 .04 5.6 20 .30 4.2 8 .09 27 2.1 3 .50 3.2 8 .07 4.0 8 .09 28 2.0 2 .01 3.0 8 .06 3.7 7 .07 29 1.9 1 .50 3.0 8 .06 2.8 6 .50 30 14 118 32 3.0 8 .06 3.5 6 .06 31 2.2 5 .60 --- --- --- 3.0 5 .90 TOTAL 270.3 865.56 775.7 2114.57 160.7 292.56 173 RIO GRANDE DE LOIZA BASIN 50051180 QUEBRADA SALVATIERRA NEAR SAN LORENZO, PR--Continued SEDIMENT DISCHARGE. SUSPENDED (TONS/DAY). WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 JANUARY FEBRUARY MARCH 1 6.7 5 .09 1.6 2 .01 1.8 3 .60 2 5.4 4 .20 1.5 2 .01 1.5 3 .50 3 3.3 4 .04 1.5 2 .01 1.4 3 .01 4 3.6 4 .04 1.4 2 .01 1.4 2 .50 5 3.4 4 .04 1.4 2 .01 1.8 3 .01 6 3.3 4 .04 1.4 2 .01 2.2 3 .90 7 2.7 4 .03 1.4 2 .01 3.9 5 .05 8 2.5 3 .80 1.4 2 .01 2.4 4 .03 9 2.3 3 .80 1.3 2 .01 1.8 4 .02 10 2.4 3 .20 1.2 2 .01 1.6 4 .02 11 2.2 2 .20 1.3 2 .01 1.5 3 .80 12 2.1 2 .01 1.3 2 .01 1.6 3 .01 13 2.0 2 .01 1.2 2 .01 1.6 3 .01 14 2.0 2 .01 1.4 2 .01 1.5 2 .80 15 2.1 2 .01 1.4 2 .01 1.5 2 .60 16 2.0 2 .01 1.4 2 .01 1.5 3 .01 17 2.0 2 .01 1.4 2 .01 1.5 3 .20 18 2.0 2 .01 1.3 2 .01 2.7 3 .90 19 2.0 2 .01 1.5 2 .01 1.7 3 .50 20 1.8 2 .01 1.8 2 .10 1.5 3 .01 21 1.7 2 .01 1.6 2 .10 1.5 2 .50 22 1.7 2 .01 1.5 2 .20 1.4 2 .01 23 1.7 2 .01 1.5 2 .20 1.4 2 .01 24 1.7 2 .01 1.6 2 .01 1.4 2 .01 25 1.7 2 .01 1.7 2 .01 1.4 2 .01 26 1.8 2 .01 1.7 2 .20 1.4 2 .01 27 1.7 2 .01 2.8 3 .02 1.5 2 .10 28 1.7 2 .01 2.7 4 .03 1.5 2 .20 29 1.6 2 .01 --- --- --- 83 558 454 30 1.6 2 .01 13 65 12 31 1.5 2 .01 12 60 1.9 TOTAL 74.2 2.68 43.2 1.06 155.9 475.23 APRIL MAY JUNE 1 3.1 8 .07 1.4 2 .20 2.7 4 .03 2 2.1 2 .50 1.3 2 .20 2.7 4 .03 3 1.7 2 .01 1.3 2 .01 2.7 4 .03 4 1.5 2 .01 1.2 2 .01 2.7 3 .80 5 1.4 2 .01 1.3 2 .01 2.6 3 .50 6 1.4 2 .01 1.2 2 .01 2.6 3 .02 7 1.8 2 .01 1.1 2 .01 2.6 2 .80 8 1.4 2 .01 1.1 2 .01 2.7 2 .30 9 1.2 2 .01 1.3 2 .01 2.6 2 .20 10 1.1 2 .01 1.2 3 .01 2.6 2 .01 11 1.2 2 .01 1.4 4 .10 2.5 2 .01 12 1.2 2 .01 2.1 5 .80 2.4 2 .01 13 1.3 2 .01 1.5 5 .02 2.1 1 .90 14 1.2 2 .01 15 139 17 2.0 1 .90 15 1.3 2 .01 172 1050 1540 2.0 1 .80 16 1.9 2 .01 62 214 90 2.0 1 .50 17 1.4 2 .01 400 2570 15500 1.9 1 .50 18 1.4 2 .01 356 2410 5670 1.9 1 .50 19 1.8 2 .01 29 170 13 1.8 1 .00 20 1.2 2 .01 9.6 35 .91 1.9 1 .01 21 1.4 2 .01 7.9 30 .64 1.9 1 .50 22 1.2 2 .01 6.3 25 .43 1.7 2 .01 23 78 468 413 4.9 17 .22 1.7 2 .01 24 33 279 74 4.5 14 .17 1.6 4 .02 25 36 229 96 4.4 12 .14 1,4 3 .60 26 9.1 25 .61 4.1 10 .11 1.6 3 .20 27 3.3 8 .07 3.9 7 .07 1.4 3 .01 28 2.1 4 .02 3.3 5 .04 1.4 3 .01 29 1.7 3 .80 3.1 4 .60 1.4 2 .50 30 1.6 3 .01 2.9 4 .20 I.! 2 .01 31 --- --- --- 2.7 4 .03 --- --- --- TOTAL 198.0 585.28 1109.0 22834.96 62.4 8.72 174 RIO GRANDE DE tOIZA BASIN 50051180 QUEBRADA SALVATIERRA HEAR SAN LORENZO, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 JULY AUGUST SEPTEMBER 1 1.3 2 .01 1.4 1 .30 2.7 2 .01 2 1.2 2 .01 1.9 1 .30 6.2 24 1.4 3 1.4 2 .10 1.4 1 .30 4.0 5 .05 4 1.4 2 .10 1.4 1 .20 2.5 5 .03 . 5 1.2 2 .10 1.3 1 .00 2.2 5 .03 6 1.1 2 .10 1.3 1 .00 2.6 5 .04 7 .99 2 .20 1.3 1 .00 2.1 5 .03 8 1.0 2 .20 1.3 1 .00 8.1 24 1.4 9 .99 2 .50 1.3 1 .00 6.3 25 .43 10 .93 2 .50 1.2 1 .00 3.1 10 .08 11 1.1 2 .80 1.1 1 .00 2.8 9 .07 12 1.1 3 .01 1.2 1 .50 82 969 2150 13 .93 3 .01 2.8 6 .05 91 643 271 14 .89 3 .50 1.6 2 .01 23 143 12 15 6.5 61 4.1 1.5 1 .70 12 48 1.6 16 9.6 80 9.6 1.3 1 .60 7.2 30 .58 17 7.1 67 5.0 1.3 1 .60 5.5 20 .30 18 2.0 7 .04 1.3 1 .30 4.7 18 .23 19 1.4 4 .02 1.3 1 .20 4.2 15 .17 20 6.8 30 .55 1.2 1 .20 3.9 12 .13 21 2.4 4 .03 1.2 1 .20 3.7 12 .12 22 1.6 1 .50 1.2 1 .10 3.5 11 .10 23 1.5 1 .50 1.1 1 .00 3.8 11 .11 24 2.2 4 .50 1.1 1 .00 11 102 30 25 1.6 4 .50 1.2 1 .00 87 1230 1450 26 2.3 6 .04 1.4 1 .20 10 50 1.4 27 1.6 3 .60 13 85 7.7 5.9 30 .48 28 2.8 8 .06 5.3 12 .17 9.8 72 4.9 29 2.0 2 .50 2.6 2 .01 6.1 28 .46 30 1.7 1 .70 2.0 2 .01 4.8 25 .32 31 1.4 1 .60 2.0 2 .01 --- --- --- TOTAL 70.03 26.98 60.5 12.66 421.7 3927.47 YEAR 3401.63 31147.73 RIO GRANDE DE LOIZA BASIN 175 50051180 QUEBRADA SALVATIERRA NEAR SAN LORENZO, 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 5.1 15 6 .24 2.9 2 .02 2' 7.3 9.6 4 .50 2.8 2 .02 3 9.2 7.6 3 .06 3.4 1 .70 4 16 --- --- 6.5 2 .50 4.2 1 .80 5 28 193 28 8.4 3 .07 6.8 2 .04 6 353 2430 5280 6.5 2 .50 5.8 2 .03 7 143 1210 2750 5.3 2 .03 4.9 2 .20 8 26 181 29 4.8 1 .70 4.2 2 .50 9 20 50 2.7 4.4 1 .50 4.1 4 .04 10 13 20 .70 4.3 1 .50 4.1 4 .04 11 10 8 .22 4.2 1 .40 4.4 4 .20 12 8.0 2 .04 16 111 17 4.2 4 .20 13 6.6 1 .20 7.9 45 .96 3.7 4 .50 14 5.8 1 .02 12 77 6.3 3.5 5 .05 15 5.4 1 .01 72 463 278 3.6 4 .50 16 5.0 0 .90 22 150 8.9 3.5 4 .50 17 5.2 0 .90 14 75 3.5 3.3 4 .20 18 10 26 .03 56 256 79 3.4 4 .04 19 5.6 3 .05 13 55 1.9 3.4 3 .50 20 5.2 1 .30 9.6 20 .52 3.7 3 .20 21 5.0 1 .01 22 111 27 3.2 3 .03 22 4,9 0 .80 7.3 30 .59 3.0 3 .02 23 86 922 1250 5.6 20 .30 3.2 3 .03 24 94 705 312 4.6 15 .19 3.5 3 .03 25 40 200 22 4.1 12 .13 3.3 3 .10 26 45 381 223 3.8 10 .10 3.1 3 .03 27 30 190 15 3.5 7 .07 2.8 3 .02 28 19 100 5.1 3.3 4 .50 2.8 3 .02 29 34 286 42 3.1 3 .50 2.6 3 .02 30 21 90 5.1 3.2 2 .50 2.5 3 .02 31 57 345 275 --- --- --- 2.5 3 .02 TOTAL 1123.3 10243.08 359.6 429.96 112.4 5.62 176 RIO GRANDE DE LOIZA BASIN 50051180 QUEBRADA SALVATIERRA NEAR SAN LORENZO, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 JANUARY FEBRUARY MARCH 1 3.0 3 .02 3.4 10 .09 1.3 1 .00 2 3.3 3 .03 2.4 4 .50 1.3 1 .00 3 2.7 3 .50 2.7 3 .02 1.1 1 .00 4 3.0 3 .60 2.4 3 .02 1.2 1 .00 5 2.6 4 .03 2.4 3 .02 1.4 1 .00 6 2.5 4 .50 2.0 3 .02 1.3 1 .00 7 2.4 5 .03 2.0 2 .90 1.3 1 .00 8 2.6 5 .10 1.9 2 .80 1.2 1 .00 9 10 65 5.7 1.8 2 .60 1.2 1 .00 10 5.5 15 .22 1.8 2 .60 1.2 1 .00 11 3.6 9 .09 1.9 2 .40 1.3 1 .00 12 2.9 6 .05 1.9 2 .30 1.2 1 .00 13 2.8 5 .04 1.7 2 .30 1.4 1 .00 14 2.6 5 .04 1.6 2 .20 1.5 1 .00 15 2.5 5 .03 1.6 2 .10 5.8 - --- 16 2.4 5 .03 1.6 2 .01 1.8 3 .50 17 7.2 39 2.5 1.7 2 .01 1.5 1 .00 18 3.3 9 .08 1.8 1 .90 1.4 1 .00 19 2.6 4 .50 1.7 1 .80 1.4 1 .00 20 2.5 2 .50 1.5 1 .60 1.3 1 .00 21 2.6 2 .01 1.5 1 .50 1.3 1 .00 22 2.4 2 .01 1.4 1 .20 1.3 1 .00 23 2.0 2 .01 1.4 1 .10 1.3 1 .00 24 2.1 2 .01 1.4 1 .00 1.3 1 .00 25 2.0 2 .01 1.4 1 .00 1.6 1 .00 26 1.9 2 .01 1.4 1 .00 2.0 1 .01 27 1.8 2 .01 1.3 1 .00 1.5 1 .00 28 1.8 2 .01 1.4 1 .00 1.3 1 .00 29 2.9 10 .08 --- 5.2 30 .21 30 2.3 5 .03 1.8 2 .50 31 11 59 7.6 1.7 1 .00 TOTAL 102.8 19.38 51.0 7.99 51.4 1.22 APRIL MAY JUNE 1 1.8 1 .00 2.9 6 .05 6.2 25 .42 2 1.4 1 .00 1.9 3 .02 5.8 20 .31 3 2.7 7 .12 1.7 1 .50 5.2 12 .17 4 2.6 7 .05 1.6 1 .00 3.7 12 .12 5 6.2 19 .83 1.5 1 .00 3.2 11 .10 6 3.3 10 .09 2.6 8 .06 2.8 10 .08 7 1.7 4 .02 6.3 23 .76 2.8 9 .07 8 4.4 35 2.9 74 914 2090 2.7 8 .06 9 2.4 6 .04 15 65 2.6 13 121 33 10 1.5 3 .50 27 108 17 34 233 151 11 1.4 3 .01 32 151 24 4.1 12 .13 12 1.3 3 .01 12 60 1.9 3.2 6 .05 13 1.5 3 .01 146 1440 6730 9.2 30 .75 14 1.3 3 .01 100 1870 12300 9.6 30 .78 15 1.2 2 .70 15 25 1.0 4.1 15 .17 16 1.5 2 .30 7 8 20 .42 3.7 7 .07 17 1.6 2 .00 5 5 18 .27 3.1 3 .50 18 1.2 1 .60 26 146 18 2.6 2 .01 19 1.2 1 .50 12 15 .49 3.2 1 .20 20 1.2 1 .20 7 2 13 .25 ;.; 1 .10 21 1.3 1 .00 5.6 12 .18 1.9 1 .10 22 1.2 1 .00 4.8 12 .16 1.7 1 .10 23 1.2 1 .00 4.0 11 .12 1.8 1 .00 24 1.2 1 .00 3.3 9 .08 2.1 1 .01 25 1.2 1 .00 3.1 8 .07 1.8 1 .00 26 1.2 1 .00 2.9 7 .60 1.8 1 .00 27 1.7 1 .00 2.7 7 .05 1.8 1 .00 28 3.3 1 .01 2.6 6 .30 1.8 1 .20 29 36 222 107 4.5 6 .07 1.6 1 .20 30 6.9 20 .37 3.4 6 .06 1.6 1 .50 31 --- --- --- 26 271 107 --- --- TOTAL 96.6 114.27 560.9 21296.01 142.5 189.20 RIO GRANDE DE IOIZA BASIN 177 50051180 QUEBRADA SALVATIERRA NEAR SAN LORENZO, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY). WATER YEAR OCTOBER 1985 TO SEPTEMBER 1986 JULY AUGUST SEPTEMBER 1 1.7 1 .80 1.4 2 .01 3.5 20 .19 2 1.7 1 .90 1.5 2 .01 2.0 15 .08 3 2.2 1 .90 1.2 2 .01 1.8 12 .06 4 1.6 2 .01 1.1 2 .01 1.7 11 .05 5 1.5 2 .01 1.0 2 .01 3.0 10 .08 6 3.0 2 .02 1.1 2 .01 2.0 10 .05 7 1.9 2 .01 1.8 2 .50 1.7 10 .05 8 1.5 2 .01 2.2 4 .02 1.5 9 .04 9 1.4 2 .01 1.5 2 .01 1.3 8 .03 10 1.4 2 .01 2.8 5 .04 1.2 8 .03 11 1.7 2 .01 7.5 25 .51 1.3 8 .03 12 2.0 2 .01 2.2 8 .05 1.1 8 .02 13 1.4 2 .01 8.6 82 26 1.5 7 .03 14 1.5 2 .01 4.7 4 .05 1.2 7 .02 15 1.7 2 .01 2.3 3 .02 1.1 9 .03 16 1.4 2 .01 1.7 2 .80 1.2 17 1.4 2 .01 1.4 2 .50 1.2 18 1.4 2 .01 1.3 2 .40 1.1 19 1.2 2 .01 1.3 2 .20 1.1 20 1.3 2 .01 1.2 2 .01 1.1 21 1.5 2 .01 1.1 2 .01 1.2 22 1.2 2 .01 3.0 5 .04 1.1 23 1.1 2 .01 1.7 4 .02 1.7 24 1.1 2 .01 1.4 3 .01 12 25 1.2 2 .01 2.1 5 .03 9.7 26 1.1 2 .01 1.2 2 .01 3.9 27 1.3 2 .01 1.1 2 .01 3.0 28 1.5 2 .01 3.8 5 .05 2.0 29 1.4 2 .01 73 508 296 1.7 30 2.7 2 .01 5.9 25 .40 1.6 31 1.9 2 .01 2.5 15 .10 --- TOTAL 48.9 2.89 144.6 325.85 69.5 0.79 YEAR 2863.5 32636.26 I I I 178 RIO GRANDE DE LOIZA BASIN 50051310 RIO CAYAGUAS AT CERRO GORDO, PR LOCATION.--Lat 18°09'13", long 65°57'20", Hydrologic Unit 21010005, at downstream side on bridge on Highway 912, at Barrio Cerro Gordo, 2.8 mi (4.5 km) south of San Lorenzo. DRAINAGE AREA.--10.2 •i 1 (26.4 km 2 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--October 1977 to current year. GAGE:--Water-stage recorder and crest-stage gage. Elevation of gage is 490 ft (150 ), from topographic map. Prior to Oct. 1, 1983, at site 2,000 ft (610 ) downstream at different datum. REMARKS.--Records fair except those for estimated daily discharges, which are poor. AVERAGE DISCHARGE.--11 years (1978-88), 49.8 ft'/s (1.410 m'/s), 66.3 in/yr (1,684 mm/yr), 36,080 acre-ft/yr (44.49 hm'/yr); median of yearly mean discharges, 40.6 ft'/s (1.15 '/s), 29,400 acre-ft/yr (36.2 hm 3/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 13,200 ft'/s (374 m'/s), Aug. 31, 1979, gage height, 9.44 ft (2.877 •), site and datum then in use, from rating curve extended above 1,000 ft'/s (28.3 ml/s) on the basis of slope-area measurement; minimum discharge, 7.1 ft'/s (0.201 43/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 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (W/s) (m'/s) (ft) (m) Date Time (ft'/s) (m'/s) (ft) (m) Oct. 18 1900 3,860 109 15.23 4.642 Dec. 7 1815 *9,610 272 *21.05 6.416 Nov. 24 1815 3,070 86.9 14.15 4.313 Aug.24 1445 3,580 101 14.84 4.523 Nov. 27 0430 8,990 255 20.55 6.264 Minimum discharge, 7.2 ft'/s (0.204 10/s), June 29, 30. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 18 19 101 67 40 e25 21 15 14 19 21 66 2 17 17 145 62 38 e30 22 14 14 235 20 66 3 22 16 94 59 46 22 20 13 14 29 22 64 4 22 27 86 57 35 21 20 13 13 22 22 60 5 16 116 87 63 37 21 18 13 13 21 21 55 6 15 69 108 58 34 22 18 33 13 27 21 54 7 13 30 1690 54 32 24 16 14 14 48 24 54 8 12 24 798 53 32 24 15 13 14 26 23 46 9 14 22 130 52 31 24 17 13 15 25 25 46 10 12 19 118 51 43 22 16 17 15 40 127 45 11 11 19 114 51 33 20 17 17 16 29 77 371 12 11 18 100 50 36 22 e15 16 16 28 38 157 13 10 18 99 47 49 22 e13 13 18 31 34 91 14 39 18 97 49 33 22 e16 15 20 42 34 93 15 42 18 95 45 34 22 e18 14 40 31 37 75 16 32 19 91 44 35 20 e15 14 41 .28 42 72 17 176 23 83 43 29 21 e16 14 e19 27 47 69 18 651 28 79 41 29 21 e14 14 e16 30 48 68 19 134 23 78 42 29 19 e13 13 e22 27 41 113 20 45 22 82 40 31 20 e14 16 37 25 42 76 21 31 20 78 40 28 18 e12 14 34 24 42 67 22 23 20 109 38 28 18 e12 13 30 27 66 68 23 20 26 76 38 28 20 e16 13 18 25 88 68 24 15 1400 69 38 32 20 e14 13 14 22 531 58 25 22 320 66 38 30 21 e12 15 11 23 276 50 26 38 429 67 37 40 22 ell 17 13 23 78 47 27 33 2410 69 39 42 27 ell 17 11 22 77 44 28 29 420 67 36 28 25 e12 18 9.4 46 79 44 29 24 162 62 36 e27 21 e13 18 8.5 29 73 43 30 19 114 58 35 --- 20 13 21 9.0 28 69 40 31 20 --- 62 35 21 --- 15 --- 21 68 --- TOTAL 1586 5886 5058 1438 989 677 460 478 541.9 1080 2213 2270 MEAN 51.2 196 163 46.4 34.1 21.8 15.3 15.4 18.1 34.8 71.4 75.7 MAX 651 2410 1690 67 49 30 22 33 41 235 531 371 MIN 10 16 58 35 27 18 11 13 8.5 19 20 40 AC-FT 3150 11670 10030 2850 1960 1340 912 948 1070 2140 4390 4500 CFSM 5.02 19.2 16.0 4.55 3.34 2.14 1.50 1.51 1.77 3.42 7.00 7.42 IN. 5.78 21.47 18.45 5.24 3.61 2.47 1.68 1.74 1.98 3.94 8.07 8.28 CAL YR 1987 TOTAL 22542.8 MEAN 61.8 MAX 2410 MIN 8.1 AC-FT 44710 CFSM 6.06 IN. 82.21 WTR YR 1988 TOTAL 22676.9 MEAN 62.0 MAX 2410 MIN 8.5 AC-FT 44980 CFSM 6.07 IN. 82.70 e Estimated 179 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 1987 TO SEPTEMBER 1988 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) OCT, 14 1445 66.6 91.1 27.0 APR, 05 1337 17.9 137 30.0 NOV, 13 1338 18.0 100 28.0 MAY, 05 0953 17.2 139 26.5 JAN, 04 1347 57.4 121 25.5 JUN, 03 1018 13.9 138 26.5 FEB, 01 1611 35.8 129 24.0 JUL, 12 1040 26.9 131 26.5 MAR, 02 1624 24.8 132 24.0 RIO GRANDE DE LOIZA BASIN 180. 50051310 RIO CAYAGUAS AT CERRO GORDO, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORD.-- Water years 1984 to 1986 PERIOD OF DAILY RECORD.-- SUSPENDED-SEDIMENT DISCHARGE: October 1983 to September 1986. INSTRUMENTATION.-- USD-49 and automatic sediment sampler. REMARKS.-- The suspended-sediment data included in this report is part of a 5-year hydrologic investigation conducted in the Rio Grande de Loiza Basin to account the amount of suspended- sediment transported to Lago Loiza, a water supply reservoir. EXTREMES FOR PERIOD OF DAILY RECORD.-- SEDIMENT CONCENTRATION: Maximum daily mean, 5,180 mg/L May 18, 1985; Minimum daily mean, 2 mg/L several days. SEDIMENT LOADS: Maximum daily mean, 77,800 tons (70,580 tonnes) May 18, 1985; Minimum daily mean, 0.06 tons (0.05) tonne several days. EXTREMES FOR WATER YEARS 1984-86.-- Water suspeneded-sediment concentration (mg/L) suspended-sediment discharge (tons per day) Year maximum minimum maximum minimum 1984 1,220 (Nov. 5) 2 (several days) 9,840 (Feb. 15) 0.06 (several days) 1985 5,180 (May 18) 5 (several days) 77,800 (May 18) 0.22 (several days) 1986 2,790 (Oct. 6) 4 (several days) 17,900 (Oct. 06) 0.16 (March 19) SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT CONCEN­ MEAN MEAN MEAN SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CUB) (MG/L) (TONS/DAY) DECEMBER OCTOBER NOVEMBER 1 53 30 4.3 188 391 866 29 30 2.3 2 33 20 1.8 54 100 15 306 806 3080 3 29 18 1.4 29 35 2.7 52 70 9.8 4 27 16 1.2 440 840 1650 39 45 4.7 5 27 15 1.1 478 1220 5650 36 40 3.9 6 27 18 1.3 194 349 267 39 38 4.0 7 29 17 1.3 74 110 22 34 35 3.2 8 29 18 1.4 52 65 9.1 28 30 2.3 25 29 2.0 9 41 25 2.8 42 52 5.9 10 31 20 1.7 37 45 4.5 26 26 1.8 11 27 15 1.1 35 42 15 26 26 1.8 12 27 16 1.2 33 40 3.6 24 25 1.6 25 1.6 13 31 40 3.3 32 39 3.4 23 24 1.5 14 31 40 3.3 32 38 3.3 23 15 31 40 3.3 33 40 3.6 26 25 1.8 16 33 45 4.0 32 40 3.5 33 35 3.1 31 35 2.9 3.2 18 23 22 1.4 30 40 3.2 31 17 25 30 2.0 30 40 35 2.9 19 37 50 5.0 30 40 3.2 29 35 2.7 20 22 22 1.3 30 40 3.2 32 35 3.0 25 35 2.4 21 22 21 1.2 30 35 2.8 2.7 27 1.7 22 25 21 1.4 29 35 23 35 23 22 1.4 35 2.7 22 22 1.3 23 21 21 1.2 29 2.7 24 20 20 1.1 29 25 20 20 1.1 28 32 2.4 22 23 1.4 32 22 1.4 26 24 20 1.3 28 2.4 23 32 2.5 23 23 1.4 27 20 20 1.1 29 28 19 20 1.0 28 32 2.4 29 30 2.3 29 25 25 1.7 28 30 2.3 25 30 2.0 30 31 35 2.9 27 2.2 30 30 40 3.2 31 21 25 1.4 --- --- --- 75 60 12 8562.5 1221 3167.4 TOTAL 861 59.6 2190 181 RIO GRANDE DE LOIZA BASIN 50051310 RIO CAYAGUAS AT CERRO GORDO, PR--Continued SEDIMENT DISCHARGE. SUSPENDED (TONS/DAY). WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 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 35 45 4.3 27 30 2.2 22 22 1.3 2 26 35 2.5 26 30 2.1 22 22 1.3 3 24 28 1.8 29 25 2.0 22 22 1.3 4 23 23 1.4 32 28 2.4 21 20 1.1 5 22 23 1.4 29 28 2.2 21 20 1.1 6 22 23 1.4 31 30 2.5 22 20 1.2 7 22 20 1.2 30 30 2.4 21 20 1.1 8 21 21 1.2 27 30 2.2 22 20 1.2 9 24 25 1.6 27 30 2.2 26 22 1.5 10 38 30 3.1 30 35 2.8 24 18 1.2 11 22 23 1.4 29 32 2.5 22 10 .59 12 24 25 1.6 100 198 199 23 5 .31 13 130 46 6.6 129 239 143 25 5 .34 14 85 75 17 48 56 9.8 37 5 .50 15 40 55 5.9 567 1140 9840 29 5 .39 16 35 45 4.3 464 976 4050 31 5 .42 17 33 32 2.9 52 70 9.8 36 5 .49 18 19 33 31 40 40 3.6 3.3 32 25 38 30 3.3 2.0 30 25 5 5 .41 .34 20 49 60 7.9 23 30 1.9 23 7 .43 21 33 40 3.6 23 30 1.9 21 6 .34 22 37 35 3.5 22 28 1.7 20 8 .43 23 32 35 3.0 22 23 1.4 22 8 .48 24 31 35 2.9 22 23 1.4 19 8 .41 25 38 35 3.6 22 23 1.4 18 8 .39 26 34 35 3.2 22 23 1.4 17 8 .37 27 32 35 3.0 23 22 1.4 17 7 .32 28 33 35 3.1 23 22 1.4 17 5 .23 29 29 32 2.5 22 22 1.3 18 4 .19 30 31 28 27 30 30 2.3 2.2 --- --- --- 17 16 4 4 .18 .17 TOTAL 1093 107.3 1958 14297.6 706 20.03 APRIL MAY JUNE 1 16 5 .22 11 2 .06 51 69 13 2 3 4 5 15 15 15 15 5 5 5 5 .20 .20 .20 .20 11 11 11 11 2 2 2 2 .06 .06 .06 .06 26 21 27 20 35 22 20 20 2.5 1.2 1.5 1.1 6 7 8 9 10 15 15 14 14 13 5 5 5 4 4 .20 .20 .19 .15 .14 12 11 11 11 13 2 2 2 2 2 .06 .06 .06 .06 .07 44 195 74 42 542 65 402 85 58 1400 21 461 17 6.6 8290 11 12 13 14 13 13 13 13 4 4 3 3 .14 .14 .11 .11 11 11 12 12 2 2 2 3 .06 .06 .06 .10 99 62 72 47 110 90 105 50 29 15 23 6.3 15 13 3 .11 11 3 .09 34 40 3.7 16 17 13 14 3 3 .11 .11 11 11 3 3 .09 .09 66 48 101 60 40 7.8 18 19 20 13 13 12 3 3 3 .11 .11 .10 11 11 11 3 3 3 .09 .09 .09 37 37 33 42 40 40 4.2 4.0 3.6 21 22 23 24 25 13 13 13 12 12 3 3 3 2 2 .11 .11 .11 .06 .06 12 12 17 13 26 8 10 10 12 35 .26 .32 .46 .42 2.5 32 30 29 28 26 35 32 32 30 30 3.0 2.6 2.5 2.3 2.1 26 27 28 29 30 12 13 17 13 11 2 2 2 3 2 .06 .07 .09 .11 .06 30 19 27 27 132 35 25 40 35 228 2.8 1.3 2.9 2.6 151 27 27 27 28 34 29 29 25 25 35 2.1 2.1 1.8 1.9 3.2 31 --- --- --- 39 60 6.3 --- --- --- TOTAL 406 3.89 579 172.29 1865 8975.1 182 RIO GRANDE DE LOIZA BASIN 50051310 RIO CAVAGUAS AT CERRO GORDO, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 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 35 45 4.3 32 46 8.3 19 20 1.0 2 34 40 3.7 43 55 6.4 18 18 .87 3 27 25 1.8 28 32 2.4 18 18 .87 4 126 336 604 105 372 553 27 30 2.2 5 167 327 212 33 40 3.6 46 87 37 6 38 46 4.7 23 24 1.5 43 60 7.0 7 29 32 2.5 24 23 1.5 21 22 1.2 8 26 30 2.1 23 22 1.4 21 22 1.2 9 25 30 2.0 22 20 1.2 18 22 1.1 10 24 30 1.9 20 20 1.1 22 30 1.8 11 24 30 1.9 21 20 1.1 41 55 7.0 12 24 28 1.8 21 20 1.1 39 85 9.0 13 24 25 1.6 21 25 1.4 64 135 48 14 26 25 1.8 25 20 1.4 155 303 251 15 26 25 1.8 22 20 1.2 41 70 7.7 16 24 25 1.6 25 30 2.0 29 40 3.1 17 23 25 1.6 19 20 1.0 118 274 239 18 23 25 1.6 19 20 1.0 89 179 51 19 24 30 1.9 21 19 1.1 70 95 21 20 25 30 2.0 18 18 .87 332 692 1830 21 27 30 2.2 19 18 .92 94 120 30 22 30 30 2.4 16 18 .78 46 55 6.8 23 31 30 2.5 17 18 .83 37 48 4.8 24 26 30 2.1 14 18 .68 33 42 3.7 25 24 30 1.9 14 18 .68 31 40 3.3 26 24 30 1.9 17 41 6.0 31 35 2.9 27 24 30 1.9 51 77 13 30 35 2.8 28 23 30 1.9 22 20 1.2 36 35 3.4 29 27 30 2.2 18 12 .58 32 35 3.0 30 34 30 2.8 20 12 .65 40 35 3.8 31 25 31 2.1 18 16 .78 --- --- --- TOTAL 1069 880.5 791 618.67 1647 2585.54 YEAR 14386 39450.42 RIO GRANDE DE LOIZA BASIN 183 50051310 RIO CAYAGUAS AT CERRO GORDO, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MGM (TONS/DAY) OCTOBER NOVEMBER DECEMBER 1 33 40 3.6 142 224 134 36 50 4.9 2 33 40 3.6 243 544 692 74 161 66 3 39 50 5.3 1010 3030 16900 45 150 18 4 33 40 3.6 248 519 562 37 80 8.0 5 32 38 3.3 650 1510 5090 39 70 7.4 6 36 40 3.9 694 1580 5160 37 68 6.8 7 45 63 9.2 355 560 825 37 62 6.2 8 51 68 11 123 210 70 37 60 6.0 9 272 783 1950 84 180 41 44 55 6.5 10 90 115 28 74 145 29 38 50 5.1 11 53 80 11 62 120 20 47 96 32 12 40 50 5.4 55 100 15 39 80 8.4 13 63 98 31 52 90 13 36 35 3.4 14 350 811 1650 74 116 28 35 30 2.8 15 71 120 23 62 100 17 34 30 2.8 16 69 140 72 47 70 8.9 38 30 3.1 17 76 200 41 46 65 8.1 39 28 2.9 18 43 50 5.8 44 60 7.1 33 28 2.5 19 41 50 5.5 43 58 6.7 34 15 1.4 20 40 50 5.4 42 50 5.7 34 15 1.4 21 40 50 5.4 41 50 5.5 32 15 1.3 22 41 50 5.5 43 50 5.8 31 15 1.3 23 38 50 5.1 45 55 6.7 30 15 1.2 24 37 46 4.6 40 52 5.6 35 15 1.4 25 56 116 21 42 60 6.8 44 55 6.5 26 114 234 105 68 150 36 34 45 4.1 27 65 90 16 39 60 6.3 34 32 2.9 28 52 50 7.0 38 50 5.1 32 31 2.7 29 51 35 4.8 37 49 4.9 30 30 2.4 30 47 28 3.6 37 50 5.0 34 30 2.8 31 41 28 3.1 --- --- --- 29 30 2.3 TOTAL 2092 4052.7 4580 29720.2 1158 - 224.5 184 RIO GRANDE DE LOIZA BASIN 50051310 RIO CAYAGUAS AT CERRO GORDO, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) JANUARY FEBRUARY MARCH 1 29 27 2.1 20 5 .27 21 30 1.7 2 33 25 2.2 19 5 .26 19 25 1.3 3 29 22 1.7 17 5 .23 26 22 1.4 4 42 50 5.7 16 5 .22 18 20 .97 5 28 20 1.5 16 5 .22 15 20 .81 6 29 20 1.6 16 5 .22 18 60 2.9 7 26 16 1.1 15 9 .36 48 110 14 8 26 10 .70 16 10 .43 42 55 6.2 9 25 10 .68 15 10 .41 25 20 1.4 10 26 10 .70 15 10 .41 22 10 .59 11 26 9 .63 15 10 .41 20 10 .54 12 26 10 .70 16 10 .43 20 9 .49 13 26 10 .70 18 12 .58 19 9 .46 14 25 10 .68 18 25 1.2 22 9 .53 15 25 9 .61 23 20 1.2 19 8 .41 16 25 10 .68 20 22 1.2 19 9 .46 17 27 12 .87 17 25 1.1 20 9 .49 18 19 27 26 10 10 .73 .70 19 30 25 40 1.3 3.2 46 22 63 46 13 2.7 20 25 9 .61 30 70 5.7 19 12 .62 21 25 5 .34 22 35 2.1 21 8 .45 22 23 26 25 5 5 .35 .34 22 20 25 20 1.5 1.1 19 19 8 8 .41 .41 24 24 9 .58 21 16 .91 21 8 .45 25 22 8 .48 20 15 .81 16 5 .22 26 27 28 29 30 22 20 20 19 19 8 5 5 5 5 .48 .27 .27 .26 .26 21 68 28 --- 15 157 45 --- .85 59 3.4 --- 18 22 19 332 44 8 8 8 850 125 .39 .48 .41 1560 15 31 19 5 .26 39 80 8.4 TOTAL 792 28.78 593 89.02 IC 1637.59 APRIL MAY JUNE 1 2 3 4 5 23 19 19 18 19 35 30 25 22 20 2.2 1.5 1.3 1.1 1.0 17 18 20 19 20 20 20 20 20 20 .92 .97 1.1 1.0 1.1 44 42 41 39 38 88 85 83 83 75 10 9.4 9.2 8.7 7.7 6 7 8 9 10 19 20 21 18 18 20 19 18 10 9 1.0 1.0 1.0 .49 .44 20 21 21 24 23 20 20 20 20 20 1.1 1.1 1.1 1.3 1.2 37 35 35 34 34 50 35 30 25 28 5.0 3.3 2.8 2.3 2.6 11 12 13 14 15 20 19 26 21 20 8 8 9 9 9 .43 .41 .63 .51 .49 31 40 32 199 958 20 50 40 430 1990 1.7 5.4 3.5 415 11300 34 32 30 29 28 28 30 30 30 30 2.6 2.6 2.4 2.3 2.3 16 17 18 19 20 36 28 36 26 23 60 30 30 28 25 5.8 2.3 2.9 2.0 1.6 240 396 1890 134 83 524 775 5180 200 100 809 1330 77800 71 22 26 25 24 24 25 29 28 25 22 20 2.0 1.9 1.6 1.4 1.4 21 22 23 24 25 29 40 454 191 95 25 55 1230 430 166 2.0 5.9 5640 416 69 64 60 59 57 57 100 100 100 100 100 17 16 16 15 15 25 24 25 26 26 20 20 20 20 20 1.4 1.3 1.4 1.4 1.4 26 27 28 29 30 41 23 20 19 18 60 30 20 20 20 6.6 1.9 1.1 1.0 .97 55 52 50 49 47 100 lu IOU 98 95 15 14 13 13 12 27 24 24 24 23 22 25 25 29 29 1.6 1.6 1.6 1.9 1.8 31 --- --- --- 45 90 11 --- --- --- TOTAL 1379 6172.57 4801 91925.49 904 96.9 RIO GRANDE DE LOIZA BASIN 185 50051310 RIO CAYAGUAS AT CERRO GORDO, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 DAY MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) JULY AUGUST SEPTEMBER 1 2 3 4 5 26 28 28 28 25 29 30 30 30 30 2.0 2.3 2.3 2.3 2.0 24 24 22 20 17 30 30 30 28 25 1.9 1.9 1.8 1.5 1.1 27 26 23 22 23 30 29 29 25 25 2.2 2.0 1.8 1.5 1.6 6 7 8 9 10 23 23 22 23 23 30 25 22 20 21 1.9 1.6 1.3 1.2 1.3 21 22 22 20 24 25 21 19 15 15 1.4 1.2 1.1 .81 .97 25 25 39 40 30 25 25 50 65 42 1.7 1.7 5.3 7.0 3.4 11 12 13 14 15 24 23 22 22 66 21 22 22 22 101 1.4 1.4 1.3 1.3 28 21 23 32 29 28 15 17 18 15 15 .85 1.1 1.6 1.2 1.1 35 393 286 72 42 45 990 543 70 50 4.3 4460 743 14 5.7 16 17 18 19 20 90 212 38 25 62 135 542 40 25 110 55 1060 2.7 4.2 22 26 23 23 22 24 15 15 15 15 15 1.1 .93 .93 .89 .97 31 ,J 25 27 26 45 45 35 32 31 3.8 3.4 2.4 2.3 2.2 21 22 23 24 25 27 22 21 32 26 75 60 55 52 50 5.5 3.6 3.1 4.5 3.5 23 21 22 25 31 12 11 10 10 9 .75 .62 .59 .68 .75 25 24 24 35 390 30 30 30 30 936 2.0 1.9 1.9 2.8 3240 26 27 28 29 30 31 47 28 29 29 27 26 70 40 38 35 31 31 8.9 3.0 3.0 2.7 2.3 2.2 26 139 143 28 23 22 9 317 420 45 33 30 .63 356 353 3.4 2.0 1.8 64 40 73 41 40 --- 97 48 108 45 40 --- 23 5.2 27 5.0 4.3 --- TOTAL 1147 1237.8 970 744.57 2001 8582.4 YEAR 21467 144512.52 186 RIO GRANDE DE LOIZA BASIN 50051310 RIO CAYAGUAS AT CERRO GORDO, 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 'RATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/I) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) OCTOBER NOVEMBER DECEMBER 1 60 80 15 98 160 42 40 25 2.7 2 67 90 16 87 120 28 ,, 25 2.8 3 61 72 12 83 120 27 37 25 2.5 4 70 83 18 75 120 24 31 28 2.3 5 101 131 37 77 110 23 44 29 3.4 6 1530 2790 17900 65 100 18 45 29 3.5 7 664 879 2320 61 110 18 39 28 2.9 8 171 200 92 59 110 18 36 28 2.7 9 76 100 21 56 108 16 37 28 2.8 10 58 60 9.4 56 107 16 38 28 2.9 11 45 45 5.5 59 105 17 35 28 2.6 12 48 40 5.2 84 128 33 60 28 4.5 13 49 39 5.2 88 140 33 42 30 3.4 14 37 35 3.5 68 110 20 38 30 3.1 15 30 32 2.6 84 95 22 40 30 3.2 16 35 30 2.8 72 85 17 39 30 3.2 17 55 73 15 67 95 17 33 30 2.7 18 68 102 27 141 251 121 31 30 2.5 19 51 70 9.6 66 95 17 34 30 2.8 20 35 45 4.3 64 83 14 36 30 2.9 21 38 40 4.1 59 75 12 33 30 2.7 22 37 40 4.0 48 65 8.4 35 30 2.8 23 360 699 1350 44 55 6.5 46 30 3.7 24 644 1410 4300 42 50 5.7 53 30 4.3 25 173 250 117 40 50 5.4 35 30 2.8 26 120 150 49 41 37 4.1 32 30 2.6 27 117 140 44 41 28 3.1 30 30 2.4 28 105 140 40 39 27 2.8 32 30 2.6 29 277 629 1370 39 26 2.7 31 30 2.5 30 124 100 33 44 25 3.0 32 30 2.6 31 150 300 121 --- --- --- 28 30 2.3 TOTAL 5456 27953.2 1947 594.7 1163 90.7 187 RIO GRANDE DE LOIZA BASIN 50051310 RIO CAYAGUAS AT CERRO GORDO, 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) (MGM (TONS/DAY) (CFS) (MG/L) (TONS/DAY) JANUARY FEBRUARY MARCH '1 30 30 2.4 18 12 .58 15 12 .49 2 35 30 2.8 17 12 .55 14 12 .45 3 40 29 3.1 17 12 .55 16 12 .52 4 50 30 4.1 28 11 .83 17 15 .69 5 35 30 2.8 39 12 1.3 20 15 .81 6 27 30 2.2 20 15 .81 19 14 .72 7 25 28 1.9 18 12 .58 17 12 .55 8 30 27 2.2 19 12 .62 15 11 .45 9 74 123 60 18 12 .58 16 11 .48 10 60 25 4.1 19 15 .77 16 10 .43 11 30 22 1.8 21 12 .68 18 9 .44 12 22 22 1.3 19 12 .62 17 8 .37 13 21 21 1.2 16 12 .52 25 8 .54 14 25 22 1.5 19 12 .62 27 5 .36 15 23 22 1.4 18 15 .73 37 5 .50 16 27 22 1.6 18 15 .73 16 5 .22 17 41 57 15 21 15 .85 14 5 .19 18 27 21 1.5 22 15 .89 14 5 .19 19 20 22 1.2 63 64 17 15 4 .16 20 19 21 1.1 31 16 1.3 16 4 .17 21 30 25 2.0 20 14 .76 16 5 .22 22 24 25 1.6 18 15 .73 15 5 .20 23 19 25 1.3 17 15 .69 15 5 .20 24 23 22 1.4 15 15 .61 15 8 .32 25 18 20 .97 15 15 .61 14 8 .30 26 16 18 .78 16 15 .65 20 9 .49 27 15 15 .61 19 16 .82 • -• 8 .35 28 24 14 .91 15 12 .49 13 8 .28 29 20 15 .81 --- --- --- 174 355 306 30 22 15 .89 51 80 11 31 20 14 .76 27 25 1.8 TOTAL 892 125.23 596 36.47 740 329.89 APRIL MAY JUNE 1 62 85 27 25 15 1.0 20 40 2.2 2 26 25 1.8 20 8 .43 28 30 2.3 3 15 20 .81 25 8 .54 23 25 1.6 4 19 20 1.0 17 8 .37 21 25 1.4 5 38 50 5.1 24 7 .45 22 20 1.2 6 31 35 2.9 38 8 .82 20 20 1.1 7 16 20 .86 40 15 1.6 18 20 .97 8 28 47 15 48 32 5.9 16 40 1.7 9 58 79 22 22 15 .89 28 60 4.5 10 16 22 .95 254 779 1680 217 569 1130 11 13 20 .70 208 335 291 21 30 1.7 12 14 18 .68 65 120 21 16 25 1.1 13 16 15 .65 346 1520 5810 29 25 2.0 14 15 10 .41 495 681 1750 39 28 2.9 15 15 10 .41 62 130 22 52 72 19 16 15 10 .41 38 70 7.2 55 60 8.9 17 15 8 .32 28 60 4.5 40 40 4.3 18 15 7 .28 591 1400 9330 29 40 3.1 19 15 7 .28 88 128 35 35 40 3.8 20 14 6 .23 37 80 8.0 28 35 2.6 21 15 6 .24 30 70 5.7 23 35 2.2 22 15 6 .24 60 70 11 21 35 2.0 23 14 7 .26 30 45 3.6 19 35 1.8 24 16 8 .35 26 30 2.1 17 32 1.5 25 13 7 .25 24 25 1.6 16 32 1.4 26 13 7 .25 23 20 1.2 19 30 1.5 27 18 7 .34 24 20 1.3 25 30 2.0 28 45 43 14 22 20 1.2 27 25 1.8 29 693 1300 11200 60 20 3.2 20 25 1.4 30 81 124 52 23 30 1.9 19 22 1.1 31 --- --- --- 273 936 3920 --- --- --- TOTAL 1379 11349.72 3066 22923.50 963 1213.07 188 RIO GRANDE DE LOIZA BASIN 50051310 RIO CAYAGUAS AT CERRO GORDO, 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 30 20 1.6 23 32 2.0 24 23 1.5 2 22 20 1.2 20 30 1.6 16 22 .95 3 22 20 1.2 18 27 1.3 14 20 .76 4 19 20 1.0 18 27 1.3 16 20 .86 5 19 20 1.0 17 22 1.0 41 40 4.4 6 65 76 18 16 22 .95 19 18 .92 7 35 45 4.3 33 42 7.3 17 15 .69 8 23 40 2.5 51 55 7.6 15 12 .49 9 20 35 1.9 20 21 1.1 16 12 .52 10 19 30 1.5 26 32 4.2 14 12 .45 11 46 61 9.9 61 82 18 13 12 .42 12 37 60 6.0 22 23 1.4 .j 12 .42 13 24 50 3.2 42 45 5.1 19 15 .77 14 26 45 3.2 51 30 4.1 24 15 .97 15 37 39 3.9 25 27 1.8 15 15 .61 16 27 37 2.7 18 25 1.2 17 15 .69 17 25 35 2.4 17 25 1.1 17 18 .83 18 25 31 2.1 16 25 1.1 18 18 .87 19 21 30 1.7 15 25 1.0 19 18 .92 20 22 28 1.7 15 20 .81 18 15 .73 21 27 28 2.0 14 20 .76 17 15 .69 22 20 27 1.5 15 20 .81 23 15 .93 23 19 26 1.3 16 18 .78 45 23 3.2 24 20 24 1.3 15 17 .69 70 52 8.6 25 18 23 1.1 14 16 .60 50 30 4.1 26 18 23 1.1 13 15 .57 30 28 2.3 27 21 22 1.2 12 15 .53 17 22 1.0 28 24 22 1.4 80 15 .49 15 20 .81 29 21 22 1.2 200 158 112 14 15 .57 30 63 91 24 59 50 8.0 13 15 .53 31 38 55 5.6 36 45 6.9 --- --- --- TOTAL 853 112.7 998 196.09 659 41.50 YEAR 18712 64966.77 I I 180 RIO GRANDE DE LOIZA BASIN 50053050 RIO TURABO AT BORINQUEN, PR LOCATION.--Lat 18°10'10", long 66°02'37", Hydrologic Unit 21010005. at right upstream end of bridge on Highway 765, 0.5 mi (0.8 km) south of Villa Borinquen, and 7.3 mi (11.7 km) upstream from Rio Grande de Loiza. DRAINAGE AREA.--7.89 mi' (20.44 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 430 ft (131 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 13,800 ft'/s (391 m'/s), Nov.27, 1987, gage height, 18.02 ft (5.492 ), from floodmark, from rating curve extended above 200 ft'/s (5.66 '/s) on basis of step-backwater analysis and slope-area measurement; minimum discharge, 1.4 ft'/s (0.040 m)/s), Oct. 11, 1987. 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 (ft'/s) (m 3/s) (ft) (m) Date Time (ft'/s) (m'/s) (ft) (m) Nov. 24 unknown 4,100 116 unknown July 2 0530 2,940 83.3 10.13 3.088 Nov. 27 unknown *13,800 391 *18.02 5.492 Aug. 24 1430 1,610 45.6 8.33 2.539 Dec. 7 unknown 3,600 102 unknown Sept.11 0815 2,030 57.5 8.95 2.728 Minimum discharge, 1.4 ft'/s (0.040 m'/s), Oct. 11 . DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 8.5 8.7 e35 e70 e38 17 9.0 18 6.5 111 12 24 2 4.8 6.1 e50 e45 e46 22 8.6 9.7 6.5 504 11 22 3 7.1 5.8 e28 e36 e30 17 8.8 7.4 5.6 78 30 21 4 6.8 5.7 e25 e35 e24 14 8.0 7.1 6.4 43 17 20 5 6.2 39 e23 e36 e22 14 8.2 7.3 5.9 28 10 19 6 4.4 58 e30 e35 e20 14 13 18 5.8 39 9.9 20 7 3.3 29 e540 e33 e18 13 10 9.6 5.5 84 19 21 8 2.8 18 e390 e33 e18 13 8.2 7.6 5.9 32 17 20 9 2.5 15 e62 e32 e23 13 8.0 7.8 6.0 27 15 35 10 2.2 12 e45 e31 e20 12 7.9 26 6.1 37 150 53 11 2.0 10 e36 e32 e17 12 7.7 17 5.9 30 82 308 12 3.3 e8.0 e34 e31 e25 12 7.5 18 5.7 25 28 213 13 5.0 e6.8 e32 e30 e23 12 7.6 9.9 6.7 22 19 110 14 15 e6.5 e31 e29 e19 11 7.0 18 7.4 23 17 83 15 52 e6.3 e31 e27 e18 11 9.2 13 51 19 17 67 16 36 e6.3 e30 e26 e16 11 9.1 9.7 23 19 22 51 17 106 ell e30 e26 e14 11 54 12 8.4 19 35 41 18 327 e9.7 e36 e25 e14 11 18 11 7.9 23 40 37 19 80 e7.2 e38 e25 e13 11 12 8.6 8.4 26 19 39 20 44 e6.5 e40 e24 e13 14 9.3 10 11 22 16 33 21 30 e5.6 e64 e23 e13 11 9.0 18 11 20 15 29 22 24 e5.0 e50 e23 e12 11 8.3 9.3 20 29 41 28 23 19 e20 e38 e22 e13 11 7.9 7.8 13 32 31 27 24 22 e620 e36 e22 e14 11 8.2 7.3 19 20 293 25 25 18 el30 e37 e22 e16 11 7.9 7.1 10 17 210 24 26 23 e250 e37 e22 e35 11 8.2 7.0 8.9 23 61 22 27 16 e2000 e36 e23 36 20 8.2 7.0 7.9 18 49 21 28 29 e350 e34 e23 19 13 7.4 6.8 7.2 43 47 21 29 32 e90 e33 e23 16 11 7.3 14 8.3 15 37 20 30 17 e45 e55 e23 --- 11 8.0 8.3 70 22 31 19 31 14 --- e115 e35 9.7 --- 7.5 --- 13 27 _.- TOTAL 962.9 3791.2 2101 922 605 395.7 311.5 345.8 371.9 1463 1427.9 1473 MEAN 31.1 126 67.8 29.7 20.9 12.8 10.4 11.2 12.4 47.2 46.1 49.1 MAX 327 2000 540 70 46 22 54 26 70 504 293 308 MIN 2.0 5.0 23 22 12 9.7 7.0 6.8 5.5 13 9.9 19 AC-FT 1910 7520 4170 1830 1200 785 618 686 738 2900 2830 2920 CFSM 3.94 16.0 8.59 3.77 2.64 1.62 1.32 1.41 1.57 5.98 5.84 6.22 IN. 4.54 17.87 9.91 4.35 2.85 1.87 1.47 1.63 1.75 6.90 6.73 6.94 CAL YR 1987 TOTAL 12671.8 MEAN 34.7 MAX 2000 MIN 1.7 AC-FT 25130 CFSM 4.40 IN. 59.75 WTR YR 1988 TOTAL 14170.9 MEAN 38.7 MAX 2000 MIN 2.0 AC-FT 28110 CFSM 4.91 IN. 66.81 e Estimated 190 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 1987 10 SEPTEMBER 1988 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURF (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) OCT, 16 1022 21.4 132 26.0 APR, 08 1102 8.97 163 27.5 NOV, 12 1355 10.8 155 29.0 MAY, 10 0928 7.92 174 25.0 DEC, 09 1559 73.5 135 27.0 JUN, 02 0827 7.16 165 24.0 JAN, 12 1505 33.5 146 25.0 JUL, 07 1400 47.70 117 26.5 MAR, 14 1420 11.6 157 30.5 RIO GRANDE DE LOIZA BASIN 191 50053050 RIO TURABO AT BORINQUEN, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORD.-- Water years 1984 to 1986 PERIOD OF DAILY RECORD.-- SUSPENDED-SEDIMENT DISCHARGE: January 1984 to September 1986. INSTRUMENTATION.-- USD-49 and automatic sediment sampler. REMARKS.-- The suspended-sediment data included in this report is part of a 5-year hydrologic investigation conducted in the Rio Grande de Loiza Basin to account the amount of suspended- sediment transported to Lago Loiza, a water supply reservoir. EXTREMES FOR PERIOD OF DAILY RECORD.-- SEDIMENT CONCENTRATION: Maximum daily mean, 7,420 mg/L May 17, i985; Minimum daily mean, 1 mg/L several days. SEDIMENT LOADS: Maximum daily mean, 106,000 tons (96,160tonnes) May 17, 1985; Minimum daily mean, 0.00 tons (0.00) tonne several days. EXTREMES FOR WATER YEARS 1984-86.-- Water suspeneded-sediment concentration (mg/L) suspended-sediment discharge (tons per day) Year maximum minimum maximum minimum 1984 3,510 (Feb. 15) 3 (several days) 19,600 (Feb. 15) 0.05 (several days) 1985 7,420 (May 17) 1 (several days) 106,000 (May 17) 0.00 (several days) 1986 5,530 (Oct. 06) 3 (several days) 39,400 (Oct. 06) 0.06 (several days) SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 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 11 8 .50 7.4 4 .40 13 12 .42 2 9.1 6 .20 7.1 4 .10 13 12 .42 3 8.5 5 .50 7.6 4 .60 12 11 .36 4 8.5 5 .50 9.8 5 .20 12 11 .36 5 8.4 5 .50 7.4 4 .80 13 10 .35 6 9.6 7 .20 7.0 4 .50 13 10 .35 7 8.8 5 .80 7.4 4 .20 13 10 .35 8 8.8 5 .80 6.6 4 .07 13 10 .35 9 9.2 6 .40 18 30 1.5 13 10 .35 10 9.3 6 .60 27 40 2.9 13 10 .35 11 9.1 6 .20 20 35 1.9 12 9 .50 12 11 8 .24 116 952 1740 12 9 .29 13 89 534 1210 184 1020 1360 12 8 .80 14 36 55 5.3 50 90 12 14 8 .50 15 23 25 1.6 325 3510 19600 12 8 .26 16 19 25 1.3 208 1440 2190 12 7 „50 17 25 30 2.0 33 28 2.5 13 7 .25 18 29 38 3.0 23 25 1.6 12 6 .50 19 22 30 1.8 19 22 1.1 12 6 .19 20 48 65 8.4 17 21 .96 12 5 .50 21 28 36 2.7 16 20 .86 12 5 .16 22 24 28 1.8 16 18 .78 13 4 .80 23 15 15 .61 15 15 .61 16 4 .50 24 9.2 6 .50 14 15 .57 15 4 .16 25 24 25 1.6 14 15 .57 13 3 .80 26 11 7 .21 14 15 .57 16 3 .50 27 8.4 5 .40 14 15 .51 18 3 .50 28 12 11 .36 14 15 .57 17 3 .14 29 8.1 5 .10 14 15 .57 17 3 .14 30 7.9 4 .90 --- --- --- 16 3 .13 31 7.6 4 .60 12 3 .10 TOTAL 557.5 1248.62 1231.3 24923.00 416 11.88' 192 RIO GRANDE DE LOIZA BASIN 50053050 RIO TURABO AT BORINQUEN, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 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 11 3 .09 7.3 3 .06 31 40 3.3 2 11 3 .09 8.1 3 .20 26 40 2.8 3 12 3 .10 8.5 3 .50 20 30 1.6 4 13 3 .11 7.7 3 .70 16 30 1.3 5 15 3 .12 7.4 4 .08 14 20 .76 6 14 3 .11 7.3 4 .08 25 40 2.7 7 11 3 .09 7.0 4 .08 53 100 14 8 9.9 3 .08 7.0 4 .08 43 60 7.0 9 9.7 3 .08 8.6 4 .10 29 30 2.3 10 9.3 3 .08 9.8 4 .10 430 3060 18400 11 9.7 3 .08 8.7 4 .09 50 70 9.5 12 8.4 3 .07 9.3 4 .10 33 50 4.5 13 8.2 3 .07 18 30 1.5 44 60 7.1 14 9.1 3 .07 9.9 10 .27 28 30 2.3 15 9.0 3 .07 9.4 6 .15 21 25 1.4 16 8.6 3 .10 8.8 5 .50 96 867 1550 17 8.8 3 .20 8.9 5 .50 29 45 3.5 18 8.0 3 .80 7.2 5 .20 19 30 1.5 19 7.7 4 .08 7.0 5 .20 26 50 3.5 20 8.2 4 .09 8.0 5 .10 17 16 .73 21 9.0 4 .10 8.8 5 .50 15 12 .49 22 9.6 4 .10 10 7 .19 14 9 .34 23 12 4 .13 22 26 1.5 13 8 .28 24 11 4 .12 20 21 1.1 11 8 .24 25 11 4 .12 26 26 1.8 11 8 .24 26 7.7 3 .80 52 181 73 11 8 .24 27 14 10 .38 38 65 6.7 10 8 .22 28 7.3 5 .10 36 65 6.3 10 8 .22 29 6.3 3 .05 37 65 6.5 11 8 .24 30 6.6 3 .05 101 486 288 13 8 .28 31 --- --- --- 37 60 6.0 --- --- TOTAL 296.1 4.53 561.7 397.18 1169 20022.58 JULY AUGUST SEPTEMBER 1 19 8 .41 6.4 5 .09 10 8 .22 2 17 8 .37 16 15 .65 10 8 .22 3 12 8 .26 10 10 .27 19 21 2.5 4 110 268 445 28 45 3.4 15 18 .73 5 396 2730 8570 19 24 1.2 69 610 792 6 41 65 7.2 17 21 .96 31 60 5.0 7 29 42 3.3 16 19 .82 15 10 .41 8 26 40 2.8 16 15 .65 11 8 .24 9 25 38 2.6 15 14 .57 13 15 .53 10 24 30 1.9 14 11 .42 11 15 .45 11 23 30 1.9 14 10 .38 11 15 .45 12 22 28 1.7 10 9 .24 14 18 .68 13 20 25 1.4 11 8 .50 14 15 .57 14 22 25 1.5 9 9 7 .80 25 38 4.2 15 20 22 1.2 11 8 .24 19 30 3.6 16 18 22 1.1 11 6 .18 23 55 7.0 17 17 22 1.0 9.1 6 .20 96 549 471 18 18 21 1.0 8.2 5 .20 87 466 179 19 16 18 .78 8.2 5 .20 74 246 70 20 18 18 .87 8.9 5 .90 1L8 558 870 21 23 18 1.1 8.9 5 .90 49 100 13 22 22 15 .89 7.4 4 .40 25 30 2.0 23 24 10 .65 7.4 4 .08 19 20 1.0 24 17 8 .37 6.9 4 .07 17 18 .83 25 17 8 .37 6.8 4 .01 16 11 .73 26 15 9 .36 27 59 8.8 15 16 .65 27 12 9 .29 20 20 1.1 15 16 .65 28 10 10 .27 11 6 .18 14 16 .60 29 16 22 .95 8.1 5 .10 14 16 .60 30 16 15 .65 10 8 .22 15 16 .65 31 8.0 8 .17 10 8 .22 --- --- --- TOTAL 1073.0 9052.36 382.2 25.01 894 2429.51 YEAR 7056.6 58121.01 RIO GRANDE DE LOIZA BASIN 193 50053050 RIO TURABO AT BORINQUEN, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) OCTOBER NOVEMBER DECEMBER 1 14 26 .98 62 342 283 14 3 .11 2 13 26 .91 123 496 328 54 15 6.3 3 14 25 .95 611 3610 22500 27 12 1.0 4 12 24 .78 182 37 22 19 6 .31 5 12 24 .78 335 54 68 18 4 .19 6 13 26 .91 279 46 39 16 4 .17 7 12 26 .84 196 46 37 16 4 .17 8 12 26 .84 114 24 7.4 20 8 .64 9 51 40 16 80 20 4.3 19 6 .31 10 16 27 1.2 64 18 3.1 19 6 .31 11 13 25 .88 54 18 2.6 17 6 .28 12 12 26 .84 46 18 2.2 16 7 .30 13 12 28 .91 43 19 2.2 15 7 .28 14 26 40 4.8 51 27 7.9 15 8 .32 15 14 31 1.2 34 28 2.6 16 8 .35 16 18 33 2.2 28 18 1.4 22 12 .96 17 18 36 1.7 24 14 .91 14 9 .34 18 14 31 1.2 22 12 .71 12 10 .32 19 13 30 1.1 21 8 .45 12 10 .32 20 13 30 1.1 19 5 .26 11 10 .30 21 15 31 1.4 18 5 .24 9.0 9 .22 22 16 32 1.4 17 5 .23 8.5 9 .21 23 15 33 1.3 18 5 .24 8.4 9 .20 24 13 29 1.0 16 4 .17 9.7 9 .24 25 23 26 1.6 16 5 .32 21 25 5.1 26 19 23 1.2 31 15 1.9 12 11 .36 27 16 20 .86 19 5 .26 12 10 .32 28 19 18 .92 15 4 .16 11 9 .27 29 14 14 .53 15 4 .16 9.2 9 .22 30 58 571 1410 15 3 .12 12 10 .32 31 17 26 1.2 --- --- 10 9 .24 TOTAL 547 1461.53 2568 23316.83 494.8 20.98 RIO GRANDE DE LO1ZA BASIN 194 50053050 RIO TURABO AT BOPINQIJEN, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) JANUARY FEBRUARY MARCH 1 17 13 1.1 10 7 .19 20 15 .81 2 17 12 .73 9.6 8 .21 18 14 .68 3 13 8 .28 9.4 8 .20 19 16 .82 4 18 13 1.1 9.7 9 .24 17 13 .60 5 12 8 .26 9.1 10 .25 18 12 .58 6 17 13 1.2 8.9 10 .24 29 136 31 7 12 8 .26 7.6 11 .23 38 18 1.8 8 11 8 .24 7.6 12 .25 30 15 1.5 9 11 8 .24 7.7 12 .25 22 11 .65 10 12 8 .26 8.0 13 .28 18 8 .39 11 10 8 .22 8.7 13 .31 16 5 .14 12 9.4 8 .20 8.9 13 .31 17 4 .18 13 9.3 7 .18 8.6 13 .30 15 4 .16 14 9.9 7 .19 10 13 .35 14 3 .11 15 11 6 .18 9.6 12 .31 13 3 .11 16 11 6 .18 9.0 8 .19 13 2 .07 17 11 6 .18 8.6 8 .19 13 2 .07 18 11 6 .18 8.4 8 .18 55 20 6.0 19 10 6 .16 22 19 1.1 23 12 .75 20 10 6 .16 20 18 .97 17 8 .37 21 9.7 6 .16 17 16 .73 16 5 .22 22 9.7 5 .13 14 13 .49 15 5 .20 23 9.4 5 .13 13 12 .42 15 5 .20 24 9.5 5 .13 15 11 .45 13 5 .18 25 9.7 4 .10 15 14 .57 13 5 .18 26 10 4 .11 16 14 .60 12 5 .16 27 9.2 4 .10 42 29 5.2 12 5 .16 28 9.3 4 .10 25 20 1.4 12 5 .16 29 8.9 5 .12 --- --- --- 67 35 12 30 8.9 6 .14 24 32 2.2 31 9.2 6 .15 24 22 2.1 TOTAL 346.1 8.87 358.4 16.41 648 64.55 APRIL MAY JUNE 1 14 10 .38 6.0 12 .2 11 6 .18 2 12 9 .29 5.7 10 .2 11 6 .18 3 11 8 .24 5.6 9 .1 11 6 .18 4 11 8 .24 5.2 8 .1 11 6 .18 5 11 6 .18 5.3 6 .1 10 5 .14 6 11 4 .12 5.1 6 .1 10 5 .14 7 12 4 .13 5.3 5 .1 9.7 5 .13 8 12 4 .13 4.8 4 .1 9.8 4 .11 9 9.3 3 .08 5.3 4 .1 9.2 4 .10 10 8.2 3 .07 4.8 3 .0 1C 4 .11 11 8.7 2 .05 5.5 2 .0 11 4 .12 12 8.3 2 .04 8.2 2 .0 12 4 .13 13 11 2 .06 6.8 1 .0 14 4 .15 14 9.0 2 .05 202 2180 1690 13 4 .14 15 8.0 1 .02 205 1200 2050 13 4 .14 16 14 6 .23 146 1330 3810 12 4 .13 17 12 5 .16 1300 7420 106000 11 4 .12 18 15 8 .32 900 5900 14300 11 5 .15 19 11 4 .12 50 95 13 11 5 .15 20 9.1 2 .05 16 14 .6 12 5 .16 21 18 10 1.1 10 10 .3 11 5 .15 22 10 4 .11 9.4 10 .3 12 5 .16 23 228 1340 4280 9.1 9 .2 12 5 .16 24 52 174 49 9.0 8 .2 12 5 .16 25 109 1010 2970 9.9 8 .2 12 5 .16 26 31 66 10 10 7 .2 11 5 .15 27 11 14 .42 11 6 .2 11 5 .15 28 8.6 14 .33 11 6 .2 11 4 .12 29 7.2 13 .25 11 6 .2 12 4 .13 30 6.4 12 .21 11 6 .2 11 4 .12 31 --- --- 11 6 .2 --- --- TOTAL 698.8 7314.38 3005.0 127867.1 337.7 4.30 RIO GRANDE DE LOIZA BASIN 50053050 RIO TURABO AT BORINQUEN. PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) JULY AUGUST SEPTEMBER 1 13 4 .14 12 8 .26 12 16 .52 2 12 4 .13 12 8 .26 12 16 .52 3 12 4 .13 11 8 .24 12 16 .52 4 12 4 .13 11 8 .24 11 15 .45 5 11 4 .12 11 8 .24 15 18 1.1 6 10 4 .11 11 8 .24 13 14 .49 7 9.2 4 .10 10 8 .22 11 13 .39 8 9.3 4 .10 10 8 .22 18 17 1.5 9 9.3 4 .10 9.5 8 .21 18 19 .92 10 9.3 4 .10 9.3 8 .20 14 14 .53 11 10 4 .11 10 8 .22 12 10 .32 12 9.7 4 .10 12 8 .26 49 462 525 13 9.1 4 .10 17 8 .37 53 160 78 14 9.3 4 .10 14 8 .30 22 21 1.5 15 19 15 .77 13 9 .32 17 15 .69 16 18 20 .97 12 9 .29 14 12 .45 17 29 40 3.1 12 9 .29 12 11 .36 18 13 6 .21 13 9 .32 11 10 .30 19 12 6 .19 12 9 .29 11 9 .27 20 11 6 .18 11 10 .30 9.7 8 .21 21 9.7 6 .16 12 10 .32 9.7 9 .24 22 11 7 .21 13 11 .39 9.7 10 .26 23 12 7 .23 12 12 .39 10 8 .22 24 13 7 .25 12 12 .39 16 28 3.6 25 11 6 .18 14 12 .45 31 76 16 26 14 8 .30 13 12 .42 14 16 .60 27 12 7 .23 30 29 3.9 12. 15 .49 28 13 7 .25 23 23 1.7 12 16 .52 29 14 8 .30 14 16 .60 11 14 .42 30 13 8 .28 13 16 .56 10 14 .38 31 12 8 .26 13 16 .56 --- --- --- TOTAL 381.9 9.64 401.8 14.97 482.1 636.77 YEAR 10269.6 160736.33 195 196 RIO GRANDE DE LOIZA BASIN 50053050 RIO TURABO AT BORINQUEN, 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 61 182 78 44 70 8.3 21 21 1.2 2 54 100 15 39 66 6.1 20 20 1.1 3 54 100 15 36 60 5.8 20 19 1.0 4 58 150 23 33 59 5.3 20 19 1.0 5 70 150 28 35 52 4.9 22 19 1.1 6 989 5530 39400 31 48 4.0 20 18 .97 7 338 1910 2330 30 43 3.5 20 18 .97 8 255 1490 1510 29 42 3.3 19 17 .87 9 134 400 145 29 42 3.3 19 17 .87 10 93 250 63 28 40 3.0 19 17 .87 11 73 160 32 27 40 2.9 19 17 .87 12 65 130 23 59 150 24 25 15 1.0 13 61 120 20 33 40 3.6 .3 15 .77 14 58 120 19 45 100 12 18 14 .68 15 57 120 18 85 200 46 18 10 .49 16 56 110 17 51 100 14 17 8 .37 17 58 110 17 43 70 8.1 17 8 .37 18 81 200 44 73 150 30 17 8 .37 19 59 120 19 47 120 15 17 8 .37 20 54 110 16 42 70 7.9 17 8 .37 21 53 100 14 52 120 17 17 8 .37 22 52 100 14 34 50 4.6 16 8 .35 23 152 844 956 30 40 3.2 16 7 .30 24 131 548 277 27 35 2.6 18 7 .34 25 85 300 69 25 30 2.0 18 6 .29 26 137 824 1870 24 29 1.9 17 7 .32 27 82 200 44 23 29 1.8 16 7 .30 28 67 200 36 21 26 1.5 17 7 .32 29 95 250 64 21 25 1.4 16 7 .30 30 60 100 16 22 22 1.3 15 8 .32 31 60 70 11 --- --- --- 15 8 .32 TOTAL 3702 47203 1118 248.3 565 19.14 197 RIO GRANDE DE LOILA BASIN 50053050 RIO TURABO AT BORINQUEN, 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 17 7 .32 14 9 .34 8.0 4 .09 2 17 7 .32 13 7 .25 8.0 4 .09 3 18 7 .34 25 127 57 8.2 4 .09 4 21 5 .28 19 15 .77 9.0 4 .10 5 17 5 .23 17 12 .55 10 5 .14 6 15 4 .16 14 10 .38 8.4 5 .11 7 15 6 .24 14 9 .34 7.8 4 .08 8 15 8 .32 13 8 .28 7.4 4 .08 9 27 9 .66 13 7 .25 7.0 4 .08 10 17 9 .41 12 5 .16 8.0 5 .11 11 14 8 .30 12 4 .13 7.0 5 .09 12 14 7 .26 12 4 .13 6.9 5 .09 13 14 7 .26 11 4 .12 7.6 5 .10 14 13 7 .25 9.0 4 .10 8.2 4 .09 15 13 6 .21 8.2 4 .09 10 4 .11 16 12 6 .19 8.4 4 .09 6.4 4 .07 17 16 8 .35 8.8 3 .80 7.0 4 .08 18 14 7 .26 35 4 .38 f '. 4 .07 19 13 7 .25 25 5 .34 6.4 4 .07 20 13 5 .18 15 5 .20 6.4 4 .07 21 13 5 .18 10 4 .11 6.2 4 .07 22 11 5 .15 9.2 4 .10 6.0 4 .06 23 8.9 5 .12 8.8 4 .10 6.0 4 .06 24 12 5 .16 8.4 4 .09 7.0 5 .09 25 9.0 5 .12 9.0 4 .10 9.1 6 .15 26 8.5 5 .11 8.4 4 .09 9.6 6 .16 27 7.3 5 .10 8.6 4 .09 8.7 6 .14 28 7.6 5 .10 8.4 4 .09 8.8 6 .14 29 18 60 21 --- --- --- 26 25 1.8 30 13 12 .42 13 10 .35 31 16 10 .43 12 8 .26 TOTAL 439.3 28.68 369.2 63.47 266.7 5.09 APRIL MAY JUNE 1 11 8 .24 19 15 .77 25 12 .81 2 9.8 8 .21 13 10 .35 30 12 .97 3 15 9 .36 18 10 .49 23 11 .68 4 20 10 .54 13 10 .35 20 10 .54 5 20 10 .54 12 10 .32 23 9 .56 6 17 8 .37 11 12 .36 20 8 .43 7 13 7 .25 26 92 31 19 7 .36 8 12 7 .23 157 861 3420 17 7 .32 9 9.8 7 .19 42 80 9.1 20 8 .43 10 9.7 8 .21 50 80 11 100 1290 2160 11 9.3 8 .20 67 150 27 20 55 3.0 12 9.2 7 .17 31 40 3.3 17 20 .92 13 8.8 5 .12 251 2210 12400 30 82 23 14 8.8 5 .12 151 1490 9650 32 67 9,1 15 11 5 .15 29 50 3.9 29 54 8.0 16 11 6 .18 18 20 .97 34 93 14 17 10 7 .19 18 15 .73 23 30 1.9 18 10 8 .22 120 747 774 18 25 1.2 19 11 8 .24 29 45 3.5 26 23 1.6 20 11 8 .24 16 18 .78 16 18 .78 21 11 8 .24 15 10 .41 14 12 .45 22 13 8 .28 60 10 1.6 14 8 .30 23 11 9 .27 30 10 .81 13 5 .18 24 11 9 .27 26 8 .56 12 5 .16 25 11 9 .27 24 7 .45 11 4 .12 26 11 9 .27 23 7 .43 11 4 .12 27 13 9 .32 24 7 .45 12 7 .23 28 17 10 .46 22 5 .30 12 7 .23 29 75 478 789 56 10 1.5 12 7 .23 30 48 168 68 22 8 .48 11 5 .15 31 --- --- --- 90 457 313 --- --- --- TOTAL 458.4 864.35 1483 26657.91 664 2230.77 198 RIO GRANDE DE LOIZA BASIN 50053050 RIO TURABO AT BORINQUEN, 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 12 5 .16 15 3 .12 1E 20 .86 2 11 4 .12 15 3 .12 15 18 .73 3 12 5 .16 16 3 .13 14 15 .57 4 10 5 .14 16 3 .13 13 15 .53 5 11 5 .15 15 3 .12 19 15 .77 6 31 129 49 14 5 .19 13 12 .42 7 13 8 .28 17 10 .46 10 10 .27 8 10 6 .16 23 20 1.2 8.4 10 .23 9 9.5 8 .21 17 5 .23 9.1 10 .25 10 8.3 8 .18 20 8 .43 8.5 10 .23 11 22 20 1.2 44 102 34 8.4 10 .23 12 15 8 .32 24 20 1.3 9.9 12 .32 13 11 5 .15 79 279 132 11 12 .36 14 16 5 .22 68 200 37 9.4 12 .30 15 17 5 .23 40 70 7.6 8.6 11 .26 16 14 5 .19 30 40 3.2 7.9 10 .21 17 12 4 .13 22 25 1.5 7.0 9 .17 18 12 4 .13 19 1B .92 6.8 5 .09 19 11 5 .15 14 10 .38 6.8 5 .09 20 14 6 .23 11 10 .30 6.6 5 .09 21 14 6 .23 9.7 10 .26 6.2 5 .08 22 8.4 5 .11 17 10 .46 6.6 5 .09 23 9.8 5 .13 14 8 .30 8.0 9 .19 24 12 4 .13 18 9 .44 57 209 105 25 13 4 .14 10 8 .22 31 10 .84 26 9.0 3 .07 8.6 8 .19 16 5 .22 27 14 5 .19 6.8 8 .15 11 5 .15 28 17 5 .23 67 794 531 9.5 5 .13 29 12 3 .10 270 1920 4760 8.3 5 .11 30 14 3 .11 27 45 3.3 9.2 5 .12 31 16 3 .13 20 20 1.1 --- --- TOTAL 411.0 55.08 987.1 5518.75 371.2 113.91 YEAR 10834.9 83008.45 I 199 RIO GRANDE DE LOIZA BASIN 50055000 RIO GRANDE DE LOIZA AT CAGUAS, PR LOCATION .--Lat 18°14'33". long 66°00'34". Hydrologic Unit 21010005, on right bank 250 ft (76 m) upstream from bridge on Highway 189, 1.2 i (1.9 km) downstream from Rio Turabo, and 1.8 mi (2.9 km) east of Plaza de Caguas. DRAINAGE AREA.--89.8 mi' (232.6 km2 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--1959 (low-flow measurement only), February to November 1959 (monthly measurements only), December 1959 to current year. GAGE.--Water-stage recorder. Elevation of gage is 143.28 ft (43.672 m) above mean sea level. REMARKS.--Records fair except those for estimated daily discharges, which are poor. AVERAGE DISCHARGES.--28 years (1961-88), 226 ft 3 /s (6.400 m'/s), 34.18 in/yr (868 mm/yr), 163,700 acre-ft/yr (202 hm ) /yr); median of yearly mean discharges, 215 ftl/s (6.09 m'/s), 156,000 acre-ft/yr (192 hii0/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 71,500 ft 3 /s (2,020 m'/s), Sept. 6, 1960, gage height, 31.17 ft (9.501 m), from rating curve extended above 6,000 ft'/s (170 m'/s) on basis of slope-area measurement; minimum daily discharge, 10 ft'is (0.283 m'/s), Apr. 5, 10, 29, 1968. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 8,000 ft'is (227 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (e/s) (ft) (m) Date Time (W/s) (111)/S) (ft) (m) Nov. 24 1900 16.000 453 16.50 5.029 Aug. 24 1545 21,400 606 18.36 5.596 Nov. 27 0545 *28,900 818 *20.65 6.294 Aug. 25 0845 10,600 300 14.22 4.334 Dec. 7 1830 28,000 793 20.37 6.209 Sept.11 1230 13.800 391 15.60 4.755 July 2 0715 15,300 433 16.23 4.947 Minimum discharge, 18 ft'is (0.510 m'/s), Oct. 13, 14. DISCHARGE. CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 131 103 439 705 174 e138 62 53 48 657 129 194 2 73 91 636 486 186 e129 60 59 44 4220 108 e170 3 95 79 357 328 331 e113 59 39 42 396 119 el60 4 119 101 326 300 189 101 59 33 40 199 200 e150 5 83 250 296 394 163 94 58 33 37 142 111 e145 6 64 354 394 349 173 93 101 124 36 228 94 el40 7 57 165 7030 294 141 90 104 80 36 1210 171 e130 8 44 115 4480 286 140 89 63 42 35 240 139 139 9 47 93 776 294 147 85 59 37 47 167 101 292 10 48 86 540 304 168 80 53 161 52 256 1090 326 11 29 77 448 300 133 80 55 122 40 203 983 3810 12 25 76 381 312 140 82 50 83 41 187 262 2560 13 24 81 332 271 e385 81 52 58 48 141 168 834 14 136 65 301 297 e155 89 48 55 47 281 134 646 15 250 64 289 223 e147 76 65 66 409 132 129 437 16 236 92 274 203 e140 73 98 52 348 117 138 367 17 812 143 252 204 e123 74 137 50 117 -107 229 291 18 3160 124 238 189 e123 72 114 60 69 179 477 255 19 711 92 315 186 e116 70 63 53 60 162 172 472 20 234 82 406 176 e129 88 43 92 185 128 133 310 21 160 66 376 165 e115 82 39 101 194 100 119 231 22 125 60 587 157 e112 72 42 86 199 223 328 208 23 111 108 322 153 e110 66 36 54 157 169 587 196 24 109 7860 281 153 e121 63 41 47 105 134 4290 192 25 127 1650 270 149 e117 66 37 43 208 111 2620 180 26 159 2990 249 149 e300 74 34 42 185 132 533 166 27 162 14500 263 147 e400 116 46 46 151 122 373 160 28 259 2890 273 153 e150 112 36 43 81 284 360 153 29 189 905 256 153 e145 96 31 53 80 254 324 150 30 123 554 222 159 --- 75 35 75 198 281 255 144 31 104 --- 514 140 70 --- 75 --- 162 211 --- TOTAL 8006 33916 22123 7779 4973 2689 1780 2017 3339 11324 15087 13608 MEAN 258 1131 714 251 171 86.7 59.3 65.1 111 365 487 454 MAX 3160 14500 7030 705 400 138 137 161 409 4220 4290 3810 MIN 24 60 222 140 110 63 31 33 35 100 94 130 AC-FT 15880 67270 43880 15430 9860 5330 3530 4000 6620 22460 29930 26990 CFSM 2.88 12.6 7.95 2.79 1.91 .97 .66 .72 1.24 4.07 5.42 5.05 IN. 3.32 14.05 9.16 3.22 2.06 1.11 .74 .84 1.38 4.69 6.25 5.64 CAL YR 1987 TOTAL 110674 MEAN 303 MAX 14500 MIN 19 AC-FT 219500 CFSM 3.38 IN. 45.85 WTR YR 1988 TOTAL 126641 MEAN 346 MAX 14500 MIN 24 AC-FT 251200 CFSM 3.85 IN. 52.46 e Estimated 200 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 1987 TO SEPTEMBER 1988 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION' (MG/L) 100 ML) 100 ML) OCT 1987 05... 0955 89 216 7.60 28.0 22 6.4 81 20 K19000 K1100 DEC 07... 0930 272 281 6.30 25.5 15 7.7 93 16 K15000 2100 FEB 1988 12... 1005 131 220 7.00 25.0 29 7.2 87 13 50000 2800 APR 06... 1045 58 272 7.70 27.0 35 6.8 85 11 9400 450 JUN 03... 0945 42 278 7.40 29.5 28 6.5 85 28 5300 320 AUG 05... 1015 113 209 6.50 26.5 97 7.6 94 <10 60000 K1400 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SLUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE D1S- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED GATE 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 1987 05... 64 0 16 5.9 19 1 2.8 85 <0.5 14 16 DEC 07... 52 FEB 1988 12... 69 APR 06... 77 0 18 7.7 23 1 1.7 84 '0.5 18 20 JUN 03... 83 AUG 05... 61 0 15 5.7 17 1 1.8 56 12 14 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER 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 1987 5... 0.10 29 154 37 25 0.62 0.08 0.70 0.13 0.37 DEC 7... 4 1.34 . 0.06 1.40 0.12 0.68 FEB 1988 12... 39 0.43 0.07 0.50 0.17 0.33 APR 6... 0.20 33 171 27 54 0.52 0.08 0.60 0.19 0.41 JUN 03... 43 0.61 0.09 0.70 0.15 0.15 AUG 05... 0.10 29 135 41 157 0.42 0.08 0.50 0.20 0.50 K = non-ideal count RIO GRANDE DE LOIZA BASIN 50055000 RIO GRANDE DE LOIZA AT CAGUAS, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA « NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN. PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1987 05... 0.5 1.2 6.8 0.20 <1 ,100 10 <1 2 20 DEC 07... 0.8 2.2 9.7 0.07 FEB 1988 12... 0.5 1.0 4.4 0.22 APR 06... 0.6 1.2 5.3 0.26 1 <100 <10 <1 <1 10 JUN 03... 0.3 1.0 4.4 0.33 AUG 05... 0.7 1.2 5.3 0.12 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 1987 5... 1700 <5 170 <0.10 <1 <1 <10 <0.010 2 0.03 DEC 7... FEB 1988 12... APR 6... 2800 6 290 <0.10 <1 <1 20 <0.010 1 0.02 JUN 03... AUG 05... 201 RIO GRANDE DE LOIZA BASIN 202 50055000 RIO GRANDE DE LOIZA AT CAGUAS, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORD.-- Water years 1984 to 1986 PERIOD Of DAILY RECORD. -- SUSPENDED-SEDIMENT DISCHARGE: October 1983 to September 1986. INSTRUMENTATION.-- USD-49 and automatic sediment sampler. REMARKS.-- The suspended-sediment data included in this report is part of a 5-year hydrologic investigation conducted in the Rio Grande de Loiza Basin to account the amount of suspended- sediment transported to Lago Loiza, a water supply reservoir. EXTREMES FOR PERIOD OF DAILY RECORD. -- SEDIMENT CONCENTRATION: Maximum daily mean, 7,470 mg/L May 13, 1986; Minimum daily mean, 11 mg/L August 12, 1985. SEDIMENT LOADS: Maximum daily mean, 290,000 tons (263,090 tonnes) May 13, 1986; I.. ,imun daily mean, 1.3 tons (1.2) July 14, 1985. EXTREMES FOR WATER YEARS 1984-86.-- Water suspeneded-sediment concentration (mg/L) suspended-sediment discharge (tons per day) Year maximum minimum maximum minimum 1984 1,860 (Nov. 05) 19 (several days) 91,400 (Nov. 05) 1.6 (April 25) 1985 2,870 (May 18) 11 (August 12) 115,000 (May 18) 1.3 (July 14) 1986 7,470 (May 13) 22 (several days) 290,000 (May 13) 2.1 (several days) SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 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 1 340 253 361 187 136 176 100 75 20 2 181 125 61 193 178 195 1330 672 6680 3 277 208 312 110 90 27 219 160 95 4 165 140 62 2390 1090 10300 139 100 38 5 122 95 31 6500 1860 91400 122 95 31 6 110 85 25 1700 796 8640 165 95 42 7 110 80 24 400 270 292 127 92 32 8 109 80 24 286 190 147 114 88 27 9 150 123 58 225 165 100 105 82 23 10 122 90 30 194 145 76 103 82 23 11 104 82 23 175 130 61 108 80 23 12 108 80 23 160 120 52 98 75 20 13 115 85 27 150 112 45 90 70 17 14 137 95 35 141 108 41 86 65 15 15 117 98 33 136 105 39 87 65 15 16 150 119 55 140 105 40 91 68 17 17 110 90 27 131 100 35 91 70 17 18 103 90 25 124 95 32 94 72 18 19 151 130 67 122 92 30 86 70 16 20 99 85 23 116 90 28 82 65 14 21 113 85 22 110 88 26 82 65 14 22 137 105 38 107 85 25 80 70 15 23 94 78 20 103 81 23 88 72 17 24 84 70 16 102 80 22 79 65 14 25 81 65 14 102 80 22 75 60 12 26 87 62 15 100 78 21 75 61 12 27 79 60 13 97 75 20 80 62 13 28 74 60 12 96 73 19 82 65 14 29 86 70 16 93 75 19 82 63 14 30 136 92 34 103 75 21 100 88 28 31 121 85 28 --- --- --- 114 104 38 TOTAL 3972 1554 14593 111974 4374 7374 203 RIO GRANDE DE LOIZA BASIN 50055000 RIO GRANDE DE LOIZA AT CAGUAS, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 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 1 124 90 30 66 55 9.8 89 70 17 2 83 70 16 67 55 9.9 85 68 16 3 73 61 12 67 60 11 82 68 15 4 75 60 12 85 70 16 82 68 15 5 74 70 14 82 70 15 77 66 13 6 70 59 11 81 65 14 81 66 14 7 70 59 11 77 63 13 76 65 13 8 71 59 11 72 62 12 74 60 '2 9 72 59 11 109 93 33 78 70 15 10 93 62 16 137 115 46 81 70 15 11 74 65 13 125 95 32 70 65 12 12 67 63 11 293 176 592 66 60 11 13 354 237 669 951 588 2610 67 56 10 14 340 236 313 307 170 141 86 58 13 15 143 110 42 1830 803 18100 72 52 10 16 107 90 26 2300 841 11700 70 50 9.5 17 131 105 37 324 180 157 70 50 9.5 18 122 110 36 211 150 85 75 50 10 19 115 100 31 166 125 56 63 50 8.5 20 207 128 87 142 110 42 58 50 7.8 21 135 105 38 129 95 33 56 50 7.6 22 109 90 26 119 90 29 59 50 8.0 23 98 84 22 110 88 26 71 55 11 24 86 70 16 104 82 23 63 45 7.7 25 107 70 20 100 79 21 55 30 4.5 26 87 70 16 98 76 20 53 20 2.9 27 87 70 16 97 75 20 52 20 2.8 28 83 68 15 94 75 19 49 20 2.6 29 77 65 14 91 70 17 48 22 2.9 30 71 60 12 --- --- --- 48 22 2.9 31 68 55 10 47 22 2.8 TOTAL 3473 1614 8434 33902.7 2103 302.0 APRIL MAY JUNE 1 48 22 2.9 34 30 2.8 158 98 42 2 44 22 2.6 33 30 2.7 124 100 33 3 46 22 2.7 33 30 2.7 85 78 18 4 44 25 3.0 34 30 2.8 97 67 18 5 47 25 3.2 34 30 2.8 72 65 13 6 50 25 3.4 33 30 2.7 262 192 210 7 51 26 3.6 36 31 3.0 668 428 1110 8 46 25 3.1 35 31 2.9 343 220 204 9 43 22 2.6 35 35 3.3 198 170 91 10 44 22 2.6 44 38 4.5 4100 1300 47900 11 46 22 2.7 42 32 3.6 443 260 311 12 45 25 3.0 36 33 3.2 239 190 123 13 41 22 2.4 67 55 16 445 377 799 14 38 21 2.2 71 52 10 255 140 96 15 38 21 2.2 50 53 10 173 115 54 16 35 20 1.9 39 35 3.7 270 192 313 17 35 21 2.0 32 31 2.7 264 210 150 18 35 21 2.0 30 20 1.6 153 112 46 19 34 20 1.8 31 21 1.8 150 110 45 20 34 20 1.8 30 20 1.6 131 105 37 21 38 20 2.1 30 20 1.6 116 90 28 22 42 20 2.3 30 20 1.6 105 82 23 23 35 19 1.8 63 56 15 95 78 20 24 34 19 1.7 55 42 6.2 90 78 19 25 31 19 1.6 80 65 19 87 71 17 26 40 20 2.2 202 144 138 86 70 16 27 80 50 26 136 120 44 81 70 15 28 104 70 20 139 114 51 77 68 14 29 46 32 4.0 102 83 23 95 68 17 30 37 31 3.1 713 428 1230 103 75 21 31 --- --- --- 245 160 106 --- --- --- TOTAL 1331 116.5 2574 1719.8 9565 51803 RIO GRANDE DE LOIZA BASIN 204 50055000 RIO GRANDE OE LOIZA AT CAGUAS, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 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 1 120 101 38 94 88 56 90 78 19 2 142 95 36 247 180 120 93 55 14 3 90 78 19 100 90 24 84 45 10 4 380 359 2090 277 205 347 148 100 51 5 1900 666 5820 172 130 60 408 234 740 6 276 180 134 100 82 22 283 120 92 7 171 130 60 87 65 15 113 80 24 8 138 105 39 77 62 13 87 68 16 9 132 100 36 74 50 10 93 70 18 10 121 100 33 72 49 9.5 131 90 41 11 110 95 28 68 48 8.8 I d 140 67 12 102 88 24 65 50 8.8 176 118 65 13 92 82 20 62 149 25 319 174 250 14 116 114 49 61 52 8.6 957 901 4230 15 131 105 37 61 53 8.7 253 165 113 16 92 80 20 73 53 10 322 195 283 17 83 70 16 65 52 9.1 781 373 1800 18 79 69 15 58 50 7.8 983 379 1640 19 76 65 13 56 49 7.4 716 201 440 20 79 65 14 61 48 7.9 1720 949 12500 21 86 65 15 66 45 8.0 673 490 890 22 102 65 18 57 45 6.9 326 220 194 23 104 65 18 55 42 6.2 243 170 112 24 85 65 15 53 42 6.0 197 140 74 25 77 65 14 50 42 5.7 173 125 58 26 73 62 12 128 90 99 157 115 49 27 82 62 14 300 173 160 146 105 41 28 71 62 12 111 90 27 152 105 43 29 89 60 14 76 68 14 135 105 38 30 172 126 72 436 282 1130 177 115 55 31 93 82 21 149 120 48 --- --- --- TOTAL 5464 8766 3411 2289.4 10314 23967 YEAR 69608 245382.4 205 RIO GRANDE DE LOIZA BASIh 50055000 RIO GRANDE DE LOIZA AT CAGUAS, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) OCTOBER NOVEMBER DECEMBER 1 152 49 20 456 265 483 166 122 55 2 132 21 7.5 1180 560 3510 423 256 491 3 155 62 33 5950 2360 56100 287 203 188 4 155 46 21 1960 951 5780 193 148 77 5 143 43 26 4120 1740 29900 176 150 71 6 207 93 70 3790 1630 21900 168 150 44 7 145 59 23 2700 934 9260 159 153 66 8 151 45 18 1150 340 1090 165 160 71 9 930 432 3440 890 366 1080 209 213 136 10 392 217 258 621 148 257 189 188 96 11 243 128 84 434 112 131 334 262 453 12 179 91 44 363 92 90 225 255 170 13 265 129 137 320 80 69 167 219 99 14 1180 561 3190 434 144 240 144 190 74 15 331 151 139 483 251 343 141 194 74 16 254 145 107 308 92 77 158 195 83 17 335 150 132 290 79 62 165 187 83 18 195 70 37 267 156 112 140 181 68 19 169 51 2.2 241 144 94 135 180 66 20 161 52 23 226 149 91 146 176 69 21 184 70 36 214 151 87 126 168 57 22 177 50 19 211 156 89 121 160 52 23 143 39 15 237 179 115 118 160 51 24 129 30 10 214 159 92 137 160 59 25 221 86 58 195 145 76 183 159 79 26 236 99 71 327 225 229 167 129 58 27 221 105 65 200 150 81 159 128 55 28 217 96 63 187 138 70 162 125 55 29 193 75 43 180 132 64 132 105 37 30 473 237 761 172 131 61 152 116 48 31 220 168 111 --- --- --- 144 106 41 TOTAL 8288 9063.7 28320 131633 5491 3126 206 RIO GRANDE DE LOIZA BASIN 50055000 RIO GRANDE DE LOIZA AT CAGUAS, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) JANUARY FEBRUAPY MARCH •1 129 105 37 68 82 15 100 93 25 2 224 165 107 71 87 17 75 62 14 3 146 110 43 65 89 16 77 60 12 4 174 173 84 59 88 14 68 58 11 5 143 116 45 59 85 14 66 56 10 6 141 110 38 57 85 13 91 120 38 7 128 111 38 55 84 12 208 143 85 8 115 110 34 56 83 13 220 149 95 9 110 109 32 55 84 12 107 82 24 10 113 108 33 54 84 12 81 62 14 11 109 102 30 55 82 12 68 56 10 12 101 99 27 56 80 12 65 52 9.1 13 97 90 24 54 80 12 69 59 11 14 92 89 22 62 80 13 61 55 9.1 15 94 91 23 76 83 17 58 48 7.5 16 87 83 19 75 81 16 58 50 7.8 17 86 82 19 60 80 13 58 52 8.1 18 84 82 19 57 68 10 219 160 148 19 88 89 21 73 70 14 105 92 31 20 82 80 18 107 82 24 69 23 4.3 21 80 79 17 75 62 13 60 72 12 22 75 77 16 66 58 10 59 71 11 23 76 76 16 62 50 8.4 57 69 11 24 77 79 21 66 55 9.8 54 68 9.9 25 73 82 16 66 55 9.8 51 66 9.1 26 85 87 20 68 59 11 51 66 9.1 27 80 88 19 229 230 171 53 65 9.3 28 74 84 17 166 240 91 60 71 12 29 69 83 15 --- --- --- 1410 649 3930 30 66 82 15 236 182 145 31 65 82 14 315 241 247 TOTAL 3163 899 2072 605.0 4329 4979.3 APRIL MAY JUNE 1 127 100 34 132 108 38 155 73 31 2 93 76 19 124 96 32 147 51 20 3 83 67 15 124 95 32 142 32 12 4 76 60 12 126 97 33 136 30 11 5 74 59 12 123 92 31 131 28 9.9 6 76 62 13 121 92 30 127 23 7.9 7 83 70 16 117 91 29 125 20 6.8 8 81 69 15 118 92 29 127 21 7.2 9 70 60 11 119 92 30 124 20 6.7 10 63 55 9 4 132 103 37 120 22 7.1 11 67 56 10 142 113 43 111 21 6.3 12 72 61 12 178 142 68 114 25 7.7 13 79 69 15 189 162 70 97 26 6.8 14 76 61 13 1070 569 2290 92 28 7.0 15 68 58 11 3280 1940 47500 88 29 6.9 16 111 89 27 1500 820 5020 87 30 7.0 17 103 80 22 5620 2480 77300 84 30 6.8 18 150 111 45 10400 2870 115000 83 35 7.8 19 109 85 25 3170 726 7350 78 40 8.4 20 84 69 16 518 344 481 75 42 8.5 21 119 97 40 374 249 251 76 45 9.2 22 131 102 47 303 212 173 71 55 11 23 1680 624 7160 262 183 129 70 60 11 24 1100 564 2110 237 170 109 69 67 12 25 864 569 3400 225 170 103 67 71 13 26 433 301 412 207 169 94 66 80 14 27 238 166 107 192 162 84 63 82 14 28 184 134 67 184 151 75 56 88 13 29 155 122 51 173 147 69 57 81 12 30 144 113 44 163 122 54 52 75 11 31 --- --- --- 157 99 42 --- --- --- TOTAL 6793 13790.4 29780 256626 2890 313.0 RIO GRANDE DE LOIZA BASIN 207 50055000 RIO GRANDE DE LOIZA AT CAGUAS, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) JULY AUGUST SEPTEMBER '1 56 72 11 90 20 4.9 122 100 33 2 80 81 17 108 19 5.5 125 105 35 3 72 79 15 94 19 4.8 125 108 36 4 84 82 19 82 21 4.6 81 69 15 5 62 73 12 74 20 2.9 119 97 56 6 49 69 9.1 73 20 3.9 99 87 23 7 43 62 7.2 87 21 4.9 64 55 9.5 8 39 59 6.2 75 21 4.3 147 100 72 9 39 53 5.6 72 19 3.7 235 179 143 10 26 42 2.9 63 16 2.7 92 75 19 11 37 41 4.1 59 15 2.4 85 71 16 12 30 31 2.5 55 11 1.6 1270 787 15700 13 30 22 1.8 167 90 41 1970 1160 10400 14 23 21 1.3 130 71 25 707 420 850 15 270 203 331 99 50 13 492 320 432 16 531 411 1030 75 30 6.1 318 218 187 17 787 574 4320 62 22 3.7 264 190 135 18 224 162 98 62 28 4.7 237 174 111 19 139 110 41 69 32 6.0 220 164 97 20 375 258 352 54 41 6.0 209 159 90 21 189 120 61 63 46 7.8 197 148 79 22 135 80 29 61 54 8.9 188 140 71 23 117 70 22 51 58 8.0 193 140 73 24 180 114 64 48 56 7.3 312 259 286 25 155 92 39 56 57 8.6 1650 894 7530 26 217 128 88 79 67 14 465 317 424 27 141 82 31 502 312 643 368 259 301 28 147 83 33 525 343 629 392 266 319 29 153 80 33 167 130 59 305 211 174 30 116 61 19 112 90 27 261 188 132 31 97 39 10 98 81 21 --- --- --- TOTAL 4643 6715.7 3412 1585.3 11312 37848.5 YEAR 110493 467184.9 208 RIO GRANDE DE LOIZA BASIN 50055000 RIO GRANDE DE LOIZA AT CAGUAS, 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 1 329 209 236 456 300 369 185 140 70 2 411 269 375 376 250 254 176 140 67 3 379 189 191 334 230 207 172 140 65 4 461 285 425 308 210 175 164 130 58 5 749 456 1020 314 220 187 202 150 82 6 8560 4270 171000 285 200 154 198 160 86 7 7600 2240 99600 258 180 125 180 130 63 8 2190 1050 8900 244 160 105 161 130 57 9 908 550 1350 238 160 103 164 125 55 10 672 370 671 226 155 95 165 125 56 11 530 348 498 221 160 95 167 120 54 12 447 320 386 335 317 548 193 120 63 13 396 290 310 447 306 435 180 150 73 14 363 260 255 457 306 508 157 120 51 15 338 250 228 1630 841 8320 153 120 50 16 323 245 214 581 400 627 146 120 47 17 398 312 402 352 255 316 135 120 44 18 675 507 1340 1270 746 4470 138 125 47 19 455 320 393 391 280 296 147 120 48 20 319 225 194 358 420 1780 153 120 51 21 297 220 176 893 396 806 136 100 37 22 289 272 215 310 220 184 133 105 38 23 2020 1340 15200 273 200 52 130 110 39 24 2760 1360 13700 253 170 116 140 110 42 25 1060 668 2930 234 165 104 130 110 39 26 1450 849 9960 223 160 96 132 100 36 27 807 470 1020 215 160 93 117 100 32 28 512 343 570 204 150 83 118 100 32 29 1260 701 3590 197 140 74 113 100 31 30 552 300 447 194 140 73 111 100 30 31 944 553 2040 --- --- --- 105 100 28 TOTAL 38454 337836 12077 20850 4701 1571 209 RIO GRANDE DE LOIZA BASIN 50055000 RIO GRANDE DE LOIZA AT CAGUAS, 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 1 117 105 33 101 70 19 61 47 7.7 2 147 110 44 78 58 12 54 45 6.6 3 128 110 38 98 71 21 51 40 5.5 4 156 110 46 143 109 47 53 40 5.7 5 140 105 40 182 80 39 65 38 6.7 6 115 105 33 100 72 19 64 35 6.0 7 105 100 28 83 70 16 57 32 4.9 8 200 105 57 79 65 14 48 32 4.1 9 450 100 121 80 65 14 51 35 4.8 10 190 100 51 68 58 11 51 35 4.8 11 150 100 40 67 55 9.9 57 32 4.9 12 120 100 32 71 57 11 64 50 8.6 13 110 95 28 72 52 10 69 50 6.5 14 100 95 26 61 52 8.6 84 65 15 15 100 97 26 66 52 9.3 195 149 95 16 96 95 25 60 52 8.4 100 85 23 17 156 100 42 60 55 8.9 64 55 9.5 18 140 100 38 77 59 12 54 40 5.8 19 104 70 20 105 80 23 48 35 4.5 20 87 70 16 113 75 23 46 25 3.1 21 105 75 21 76 58 12 44 22 2.6 22 102 70 19 65 52 9.1 39 22 2.3 23 89 80 19 70 52 9.8 36 25 2.4 24 109 90 26 58 51 8.0 37 25 2.5 25 122 90 30 58 51 8.0 35 25 2.4 26 88 80 19 58 50 7.8 61 30 4.9 27 78 70 15 58 46 7.2 57 32 4.9 28 76 70 14 59 46 7.3 40 35 3.8 29 94 70 18 --- --- --- 480 253 483 30 102 80 22 180 125 61 31 95 80 21 108 90 26 TOTAL 3971 1008 2266 405.3 2453 828.5 APRIL MAY JUNE 1 142 110 42 278 213 247 222 150 90 2 97 75 20 144 110 43 177 140 67 3 110 98 48 102 90 25 203 130 71 4 238 195 287 98 85 22 160 100 43 5 226 184 146 95 75 19 132 90 32 6 198 105 56 160 129 74 118 80 25 7 98 52 14 545 605 3420 115 70 22 8 162 113 123 1980 1330 32000 135 90 33 9 193 149 106 630 558 2180 363 244 453 10 83 62 14 1060 504 3150 946 478 2820 11 61 55 9.1 1310 685 3380 203 150 82 12 52 50 7.0 308 205 170 160 120 52 13 48 48 6.2 2870 7470 290000 249 190 229 14 44 40 4.8 1320 671 3590 280 197 165 15 51 40 5.5 457 250 308 178 175 90 16 87 80 19 292 200 158 245 200 132 17 57 48 7.4 238 190 122 194 120 63 18 37 35 3.5 1940 1040 11600 168 120 54 19 33 31 2.8 482 225 293 222 180 108 20 93 82 52 296 200 160 174 115 54 21 62 60 10 266 200 144 147 105 42 22 39 40 4.2 289 256 260 132 100 36 23 42 38 4.3 206 140 78 126 100 34 24 33 35 3.1 180 120 58 126 95 32 25 32 35 2.7 160 115 50 108 90 26 26 28 31 2.3 150 110 45 103 89 25 27 39 35 3.7 138 110 41 126 90 31 28 124 90 30 132 100 36 121 90 29 29 1830 1640 22600 180 150 73 108 85 25 30 460 417 1130 163 120 53 100 82 22 31 --- --- --- 1040 714 7570 --- --- --- TOTAL 4799 24763.6 17509 359369 5841 4987 210 RIO GRANDE DE LOIZA BASIN 50055000 RIO GRANDE DE LOIZA AT CAGUAS, 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 1 103 82 23 16 50 10 165 120 53 2 103 82 23 83 50 11 247 190 121 3 103 81 23 67 49 8.9 117 82 26 4 93 80 20 66 49 8.7 101 80 22 5 88 74 18 65 49 8.6 143 85 33 6 179 117 71 54 50 7.3 109 88 26 7 129 120 42 61 50 8.2 99 80 21 8 98 90 24 146 94 42 83 65 15 9 85 75 17 68 62 11 78 60 13 10 80 69 15 62 65 11 75 46 9.3 11 118 91 39 218 154 119 65 50 8.8 12 155 100 42 113 70 21 61 50 8.2 13 100 80 22 131 87 53 64 50 8.6 14 100 80 22 241 159 121 84 55 12 15 121 100 33 115 75 23 55 45 6.7 16 121 90 29 82 55 12 46 40 5.0 17 95 75 19 63 45 7.7 41 38 4.2 18 89 70 17 55 40 5.9 34 32 2.9 19 81 65 14 52 40 5.6 29 28 2.2 20 77 65 14 46 38 4.7 29 27 2.1 21 90 65 16 43 38 4.4 31 25 2.1 22 75 65 13 46 45 5.6 37 30 3.0 23 67 65 12 115 90 28 61 50 8.2 24 65 60 11 94 85 22 549 338 1130 25 69 59 11 81 60 13 350 250 236 26 66 52 9.3 58 50 7.8 211 170 97 27 65 50 8.8 49 43 5.7 130 90 32 28 76 50 10 136 85 31 89 70 17 29 66 50 8.9 2940 1320 18800 63 55 9.4 30 99 70 23 316 150 128 54 45 6.6 31 136 71 28 215 120 70 --- --- --- TOTAL 2992 678.0 5957 19615.1 3300 1947.3 YEAR 104320 773858.8 211 RIO GRANDE DE LOIZA BASIN 50055000 RIO GRANDE DE LOIZA AT CAGUAS. PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1986 TO SEPTEMBER 1987 DAY MEAN DISCHARGE (CFS) MEAN CONCEN- TRATION (MG/L) SEDIMENT DISCHARGE (TONS/DAY) MEAN DISCHARGE (CFS) MEAN CONCEN- TRATION (MG/L) SEDIMENT DISCHARGE (TONS/DAY) MEAN DISCHARGE (CFS) MEAN CONCEN- TRATION (MG/L) SEDIMENT DISCHARGE (TONS/DAY) OCTOBER NOVEMBER DECEMBER 1 2 3 4 5 60 55 49 49 44 35 32 29 29 27 5.7 4.8 3.8 3.8 3.2 76 86 86 85 164 43 48 48 48 89 8.8 11 11 11 48 119 121 156 155 150 65 62 80 80 70 21 20 34 33 28 6 7 8 9 10 44 49 50 185 169 27 30 30 89 92 3.2 2.3 4.1 68 47 232 239 330 198 191 129 128 176 109 87 109 89 186 61 42 124 189 132 140 152 65 90 50 50 80 22 46 18 19 33 11 12 13 14 15 89 96 64 82 85 55 45 40 45 45 13 12 6.9 10 10 412 2860 887 340 374 215 1080 434 125 197 325 14800 1470 126 237 333 220 169 215 160 150 115 90 115 85 181 68 41 67 37 16 17 18 19 20 319 159 105 80 64 158 84 57 45 37 220 36 16 9.7 6.4 655 954 446 248 198 336 454 226 110 80 1280 2500 329 74 43 185 139 131 112 116 95 80 70 65 68 47 30 25 20 21 21 22 23 24 25 59 176 99 142 311 34 93 54 76 160 5.4 44 14 29 134 177 170 158 140 167 65 52 45 38 60 31 24 19 14 27 121 100 91 86 108 70 60 52 48 55 23 16 13 11 16 26 27 28 29 30 31 219 162 120 88 86 83 114 86 65 49 48 46 67 38 21 12 11 10 167 269 159 150 143 --- 90 131 80 75 70 --- 41 118 34 30 27 --- 99 100 171 112 95 96 55 55 85 65 50 50 15 15 39 20 13 13 TOTAL 3442 871.3 10761 22125.8 4397 1005 212 RIO GRANDE DE LOIZA BASIN 50055000 RIO GRANDE DE LOIZA AT CAGUAS, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1986 TO SEPTEMBER 1987 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) JANUARY FEBRUARY MARCH 1 84 48 11 174 110 52 10 38 7.2 2 80 45 9.7 118 70 22 68 38 7.0 3 78 42 8.8 100 60 16 84 45 10 4 81 50 11 88 52 12 173 80 37 5 223 112 83 88 48 11 205 100 55 6 179 104 62 95 45 12 97 55 14 7 336 160 178 85 45 10 76 40 8.2 8 232 114 103 74 45 9.0 63 35 6.0 9 206 123 81 71 42 8.1 59 32 5.1 10 119 65 21 69 38 7.1 58 32 5.0 11 109 55 16 732 340 1000 54 32 4.7 1? 100 50 13 163 140 62 132 70 25 13 89 45 11 638 293 1080 68 35 6.4 14 89 45 11 350 189 225 57 31 4.8 15 140 60 23 315 161 166 55 32 4.8 16 100 55 15 152 80 33 90 55 13 17 86 48 11 126 70 24 166 100 45 18 92 50 12 113 65 20 104 65 18 19 83 46 10 98 59 16 60 30 4.9 20 79 45 9.6 88 50 12 45 28 3.4 21 81 46 10 80 45 9.7 42 22 2.5 22 74 39 7.8 69 40 7.5 40 21 23 158 90 38 70 40 8.0 35 20 1.9 24 150 80 32 70 35 6.6 29 16 1.3 25 102 57 16 69 35 6.5 47 19 2.4 26 88 47 11 66 32 5.7 35 18 1.7 27 78 42 8.8 94 38 9.6 27 12 .87 28 72 40 7.8 80 40 8.6 24 12 .78 29 72 40 7.8 --- --- --- 24 12 .78 30 483 262 503 21 11 .62 31 202 108 66 20 11 .59 TOTAL 4145 1408.3 4335 2859.4 2128 300.24 RIO GRANDE DE LOIZA BASIN 213 50055000 RIO GRANDE DE LOIZA AT CAGUAS, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1986 TO SEPTEMBER 1987 DAY MEAN DISCHARGE (CfS) MEAN CONCEN- TRATION (MG/L) SEDIMENT DISCHARGE (TONS/DAY) MEAN DISCHARGE (CfS) MEAN CONCEN- TRATION (MG/L) SEDIMENT DISCHARGE (TONS/DAY) MEAN DISCHARGE (CfS) MEAN CONCEN- TRATION (MG/L) SEDIMENT DISCHARGE (TONS/DAY) APRIL MAY JUNE 1 2 3 4 5 20 19 22 21 40 11 10 11 11 25 .59 .51 .65 .62 2.7 24 43 55 76 52 12 20 30 45 35 .78 2.3 4.5 9.2 4.9 80 71 134 173 97 35 30 81 100 55 7.6 5.8 56 65 14 6 7 8 9 10 111 157 48 31 22 55 68 27 18 15 31 41 3.5 1.5 .89 208 71 34 31 29 104 40 20 18 17 75 7.7 1.8 1.5 1.3 82 95 85 100 80 48 50 25 40 40 11 13 5.7 11 8.6 11 12 13 14 15 37 595 366 315 207 20 284 203 156 110 2.0 1060 295 138 61 76 180 70 51 31 40 90 45 35 19 8.2 44 8.5 4.8 1.6 100 60 95 80 290 40 38 50 45 173 11 6.2 13 9.7 271 16 17 18 19 20 125 109 91 71 54 58 55 45 30 25 20 16 11 5.8 3.6 25 22 27 338 379 12 12 12 148 174 .81 .71 .87 489 203 270 95 100 270 2340 122 58 50 135 902 111 15 13 128 9670 21 22 23 24 25 45 42 41 37 28 22 22 21 20 17 2.7 2.5 2.3 2.0 1.3 1360 544 277 206 225 537 271 149 104 152 3890 471 133 63 177 3240 4000 690 2'1 319 1590 1050 160 160 140 32500 20600 166 166 121 26 27 28 29 30 31 28 24 24 24 23 --- 16 12 12 12 12 --- 1.2 .78 .78 .78 .75 --- 471 276 162 124 102 89 202 137 80 60 48 40 297 104 35 20 13 9 6 254 334 284 333 314 --- 120 180 140 180 160 --- 82 162 107 162 136 --- TOTAL 2777 1710.45 5658 6083 07 14849 64647.6 214 RIO GRANDE DE LOIZA BASIN 50055000 RIO GRANDE DE LOIZA AT CAGUAS, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1986 TO SEPTEMBER 1981 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 1 213 120 69 269 169 163 180 90 44 2 202 100 55 145 50 20 141 70 27 3 210 110 62 452 182 386 110 55 16 4 201 161 233 222 120 12 81 40 8.7 5 461 201 383 198 120 64 100 50 13 6 221 60 36 166 80 36 64 38 6.6 7 204 100 55 116 60 19 58 35 5.5 8 201 100 54 100 50 13 90 55 13 9 172 90 42 100 50 13 L.) 37 6.9 10 185 90 45 95 45 12 85 40 9.2 11 168 80 36 84 46 10 84 40 9.1 12 148 80 32 76 45 9.2 64 32 5.5 13 139 70 26 74 40 8.0 50 30 4.1 14 134 70 25 82 40 8.9 104 55 15 15 394 210 383 124 80 27 65 35 6.1 16 206 66 43 143 70 27 56 25 3.8 17 155 40 17 103 55 15 119 59 46 18 130 40 14 117 65 21 176 98 61 19 120 35 11 136 70 26 415 215 556 20 107 30 8 7 154 80 33 148 80 32 21 436 217 497 120 70 23 58 35 5 5 22 165 120 53 89 50 12 144 70 27 23 115 70 22 81 45 9.8 92 50 12 24 95 70 18 75 42 8.5 106 55 16 25 130 70 25 70 38 7.2 70 40 7.6 26 135 80 29 89 40 9.6 45 27 3.3 27 136 70 26 69 35 6.5 35 25 2.4 28 156 70 29 60 32 5.2 32 22 1.9 29 120 70 23 60 32 5.2 97 50 13 30 115 80 25 59 30 4.8 118 60 19 31 272 148 195 101 55 15 --- --- --- TOTAL 5852 2571.7 3829 1089.9 3056 996.2 215 RIO GRANDE DE 1011A BASIN 50055000 RIO GRANDE DE LOIZA AT CAGUAS, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1987 TO .APTEMBEE 1988 DAY MEAN DISCHARGE (CFS) MEAN CONCEN- TRATION (MG/L) SEDIMENT DISCHARGE (TONS/DAY) MEAN DISCHARGE (CFS) MEAN CONCEN- TRATION (MG/L) SEDIMENT DISCHARGE (TONS/DAY) MEAN DISCHARGE (CFS) MEAN CONCEN- TRATION (MG/L) SEDIMENT DISCHARGE (TONS/DAY) OCTOBER NOVEMBER DECEMBER 1 2 3 4 5 131 73 95 119 83 62 35 50 60 40 22 6.9 13 19 9.0 103 91 79 101 250 28 27 27 48 119 1.8 6.6 5.8 13 134 439 636 357 326 296 195 321 180 160 160 231 982 174 141 128 6 7 8 9 10 64 57 44 47 48 30 29 25 25 25 5.2 4.5 3.0 3.2 3.2 354 165 115 93 86 114 80 65 55 45 231 36 20 14 10 394 7030 4480 776 540 200 2470 1220 200 200 213 134000 34300 419 292 11 12 13 14 15 29 25 24 136 250 20 15 12 73 122 1.6 1.0 .78 39 129 77 76 81 65 64 45 40 50 40 37 9.4 8.2 11 7.0 6.4 448 381 332 301 289 190 180 170 150 150 230 185 152 122 117 16 17 18 19 20 236 812 3160 711 234 129 363 1120 343 125 99 908 14400 1090 79 92 143 124 92 82 50 65 60 50 40 12 25 20 12 8.9 274 252 238 315 406 150 140 125 150 190 111 95 80 128 208 21 22 23 24 25 160 125 111 109 127 85 65 58 60 70 37 22 17 18 24 66 60 108 7860 1650 38 35 60 2590 799 6.8 5.7 17 71500 6780 376 587 322 281 270 190 220 170 140 140 193 349 148 106 102 26 27 28 29 30 31 159 162 259 189 123 104 85 85 131 80 30 28 36 37 71 41 10 7.9 2990 14500 2890 905 554 --- 1210 4880 1210 405 230 --- 21600 227000 12700 1120 344 --- 249 263 273 256 222 514 130 140 140 140 110 268 87 99 103 97 66 551 TOTAL 8006 17157.28 33916 341671.6 22123 174209 216 RIO GRANDE DE LOIZA BASIN 50055000 RIO GRANDE DE LOIZA AT CAGUAS--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 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 1 705 338 869 174 95 45 138 45 17 2 486 210 276 186 90 45 129 60 21 3 328 70 62 331 175 183 113 30 9.2 4 300 40 32 189 95 48 101 30 8.2 5 394 120 128 163 80 35 94 20 5.1 6 349 200 188 173 90 42 93 18 4.5 7 294 150 119 141 75 29 90 15 3.6 8 286 160 124 140 70 26 89 10 2.4 9 294 120 95 147 75 30 85 10 2.3 10 304 120 98 168 80 36 80 10 2.2 11 300 80 65 133 65 23 80 10 2.2 12 312 150 126 140 60 23 82 10 2.2 13 271 140 102 385 221 358 81 10 2.2 14 297 145 116 155 95 40 89 10 2.4 15 223 110 66 147 80 32 76 10 2.1 16 203 100 55 140 75 28 73 10 2.0 17 204 100 55 123 60 20 74 10 2.0 18 189 95 48 123 50 17 72 10 1.9 19 186 90 45 116 35 11 70 10 1.9 20 176 90 43 129 28 9.8 88 10 2.4 21 165 85 38 115 20 6.2 82 10 2.2 22 157 80 34 112 18 5.4 72 10 1.9 23 153 80 33 110 10 3.0 66 10 1.8 24 153 80 33 121 10 3.3 63 10 1.7 25 149 75 30 117 10 3.2 66 10 1.8 26 149 72 29 300 101 450 74 10 2.0 27 147 72 29 400 170 184 116 20 6.3 28 153 75 31 150 60 24 112 15 4.5 29 153 75 31 145 50 20 96 10 2.6 30 159 80 34 --- --- --- 75 10 2.0 31 140 75 28 70 10 1.9 TOTAL 7779 3062 4973 1779.9 2689 125.5 217 RIO GRANDE DE LOIZA BASIN 50055000 RIO GRANDE DE LOIZA AT CAGUAS--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 DAY MEAN DISCHARGE (CFS) MEAN CONCEN- TRATION (MG/L) SEDIMENT DISCHARGE (TONS/DAY) MEAN DISCHARGE (CFS) MEAN CONCEN- TRATION (MG/L) SEDIMENT DISCHARGE (TONS/DAY) MEAN DISCHARGE (CFS) MEAN CONCEN- TRATION (MG/L) SEDIMENT DISCHARGE (TONS/DAY) APRIL MAY JUNE 1 2 3 4 5 62 60 59 59 58 10 10 10 10 10 1.7 1.6 1.6 1.6 1.6 53 59 39 33 33 30 25 22 20 20 4.3 4.0 2.3 1.8 1.8 48 44 42 40 37 30 28 25 25 25 3.9 3.3 2.8 2.7 2.5 6 7 8 9 10 101 104 63 59 53 40 50 35 32 32 11 14 6.0 5.1 4.6 124 80 42 37 161 70 45 25 22 78 23 9.7 2.8 2.2 95 36 36 35 47 52 22 21 21 22 25 2.1 2.0 2.0 2.8 3.5 11 12 13 14 15 55 50 52 48 65 30 30 30 30 35 4.5 4.1 4.2 3.9 6.1 122 83 58 55 66 70 45 40 32 35 23 10 6.3 4.8 6.2 40 41 48 47 409 25 22 22 22 209 2.7 2.4 2.9 2.8 337 16 17 18 19 20 98 137 114 63 43 45 78 65 30 25 12 70 20 5.1 2.9 52 50 60 53 92 32 32 32 32 35 4.5 4.3 5.2 4.6 8.7 348 117 69 60 185 156 65 38 30 81 171 21 7.1 4.9 46 21 22 23 24 25 39 42 36 41 37 25 22 21 21 22 2.6 2.5 2.0 2.3 2.2 101 86 54 47 43 50 45 31 30 30 14 10 4.5 3.8 3.5 194 199 157 105 208 104 100 80 60 106 71 56 36 17 110 26 27 28 29 30 31 34 46 36 31 35 --- 20 20 20 20 20 --- 1.8 2.5 1.9 1.7 1.9 --- 42 46 43 53 75 75 30 29 28 35 40 40 3.4 3.6 3.3 5.0 8.1 8.1 185 151 81 80 198 --- 94 70 45 38 107 --- 64 29 9.8 8.2 94 --- TOTAL 1780 203.0 2017 291.8 3339 1120.4 218 RIO GRANDE DE LOIZA BASIN 50055000 RIO GRANDE DE LOIZA AT CAGUAS--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 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 1 657 346 930 129 65 23 194 95 50 2 4220 2860 66700 108 56 16 170 85 39 3 396 174 208 119 60 19 160 80 35 4 199 100 54 200 100 54 150 70 28 5 142 70 27 111 60 18 145 70 27 6 228 130 106 94 50 13 140 70 26 7 1210 489 2920 171 100 46 130 70 25 8 240 120 78 139 65 24 139 70 26 9 167 80 36 101 55 15 292 124 105 10 256 125 86 1090 716 7830 326 169 231 11 203 100 55 983 663 4260 3810 1360 26700 12 187 100 50 262 100 71 2560 940 8400 13 141 75 29 168 75 34 834 390 924 14 281 140 106 134 70 25 646 220 384 15 132 65 23 129 65 23 437 200 236 16 117 60 19 138 80 30 367 195 193 17 107 60 17 229 136 126 291 150 118 18 179 100 48 477 249 437 255 130 90 19 162 90 39 172 80 37 472 230 454 20 128 65 21 133 70 25 310 160 134 21 100 50 13 119 60 19 231 130 81 22 223 100 60 328 165 300 208 120 67 23 169 85 39 587 296 748 196 100 53 24 134 70 25 4290 1620 61500 192 100 52 25 111 65 19 2620 1180 18300 180 95 46 26 132 65 23 533 259 416 166 90 40 27 122 65 21 373 185 186 160 85 37 28 284 151 350 360 180 175 153 80 33 29 254 129 98 324 170 149 150 80 32 30 281 150 149 255 130 90 144 70 27 31 162 85 37 211 110 63 --- --- --- TOTAL 11324 72386 15087 95072 13608 38693 YEAR 126641 745771.48 219 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 mi' (36.5 km'). PERIOD OF RECORD.--Water years 1972 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN. (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1987 09... 1140 27 492 7.50 29.0 31 3.2 41 63 26000 5900 DEC 14... 0935 41 500 6.60 25.0 3.8 3.7 45 44 K130000 76000 FEB 1988 12... 1225 31 557 7.10 27.0 2.8 35 K750000 70000 APR 8... 1130 22 583 7.60 28.0 9.3 4.8 61 50 5100 K1200 JUN 17... 1100 30 408 7.20 30.0 6.2 3.0 39 38 37000 K1800 AUG 29... 0845 33 522 7.30 28.0 3.0 3.5 44 28 410000 70000 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SLUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1987 9... 140 7 35 12 44 2 7.1 130 <0.5 48 41 DEC 14... 150 FEB 1988 12... 160 APR 08... 150 0 39 13 44 2 6.2 150 <0.5 58 45 JUN 17... 140 AUG 29... 150 35 38 13 35 1 6.3 170 41 35 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN", GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE 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 1987 09... 0.80 30 296 21 65 3.70 0.20 3.90 5.9 1.3 DEC 14... <1 0.83 0.17 1.00 4.8 0.5 FEB 1988 12... 0.88 0.22 1.10 8.0 1.4 APR 08... 0.50 30 331 19 16 0.87 0.23 1.10 8.0 5.0 JUN 17... 13 0.21 0.09 0.30 7.6 1.5 AUG 29... 0.20 30 267 24 6 0.49 0.11 0.60 5.0 1.6 K = non-ideal count -- RIO GRANDE DE LOIZA BASIN 220 50055250 RIO CAGUITAS AT HIGHWAY 30 AT CAGUAS, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER. MONIA + NITRO- NITRO- Pisus- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1987 09... 7.2 9.2 39 2.00 1 <100 20 60 31 490 DEC 14... 5.3 6.3 28 1.70 FEB 1988 12... 9.4 10 46 2.80 APR 8... 13 14 62 1.50 1 100 20 5 8 180 JUN 17... 9.1 9.4 42 2.80 AUG 29... 6.6 7.2 32 1.60 METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL MANGA- BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL FRABLE ERABLE TOTAL PHENOLS SUB- TOTAL STANCE DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1987 9... 1900 16 340 0.20 1 3 790 <0.010 6 0.75 DEC 14... - - FEB 1988 12... APR 08... 500 <5 210 0.20 <1 3 160 0.200 12 0.93 JUN _ - 17... - AUG 29... 221 RIO GRANDE DE LOIZA BASIN 50055400 RIO BAIROA NEAR CAGUAS, PR WATER-QUALITY kECORDS 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 mil (14.0 km2 ). PERIOD OF RECORD.--Water years 1958, 1962-66, 1973-74, 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1987 09... 0840 7.4 390 7.60 25.0 69 4.2 50 66 K1600000 840000 DEC 14... 1145 7.8 420 7.20 25.0 1.2 6.2 75 50 360000 K120000 FEB 1988 16... 0900 7.1 378 6.90 22.0 2.2 8.4 95 27 K79000 28000 APR 22... 0925 4.1 425 7.90 25.0 3.1 7.5 90 <10 2300 KI900 JUN 17... 0905 3.3 436 7.50 25.5 32 5.1 62 <10 31000 23000 AUG 29... 1015 6.6 479 7.30 28.0 4.5 3.1 39 55 K3300000 410000 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- UNITY CHLO- NESS NONCARB CALCIUM SLUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT 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 1987 09... 110 0 26 10 24 1 6.2 120 <0.5 22 28 DEC 14... 140 FEB 1988 16... 120 APR 22... 160 22 38 15 24 0.9 3.0 130 <0.5 25 37 JUN 17... 130 AUG 29... 140 0 32 15 36 1 5.8 160 27 33 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1987 09... 0.30 22 210 4.2 71 0.94 0.06 1.00 6.20 DEC 14... <1 1.55 0.05 1.60 1.30 1.0 FEB 1988 16... 1 0.98 0.12 1.10 7.10 6.9 APR 22... 0.20 30 253 2.8 25 1.48 0.02 1.50 0.07 JUN 17... 13 1.07 0.03 1.10 0.20 0.40 AUG 29... 0.20 28 273 4.9 13 0.99 0.11 1.10 5.80 2.4 K = non-ideal count 222 RIO GRANDE DE LOIZA BASIN 50055400 RIO BAIROA NEAR CAGUAS, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA t NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1987 09... <0.2 - 1.60 2 100 50 1 5 20 DEC 14... 2.3 3.9 17 0.97 FEB 1988 16... 14 15.1 45 1.60 - APR 22... <0.2 0.41 2 <100 <10 1 <1 20 JUN 17... 0.6 1.7 7.5 0.57 AUG 29... 8.2 9.3 41 2.80 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 1987 09... 4200 10 220 0.20 2 <1 50 <0.010 9 0.15 DEC 14... FEB 1988 16... APR 22... 420 <5 100 <0.10 ,1 <1 <10 <0.010 <1 0.05 JUN 17... AUG 29... RIO GRANDE DE LOIZA BASIN 223 50055650 QUEBRADA CAIMITO NEAR JUNCOS WATER-QUALITY RECORDS PERIOD OF RECORD.-- Water years 1984 to 1986 PERIOD OF DAILY RECORD. -- SUSPENDED-SEDIMENT DISCHARGE: January 1984 to September 1986. REMARKS.-- The suspended-sediment data included in this report is part of a 5-year hydrologic investigation conducted in the Rio Grande de Loiza Basin to account the amount of suspended­ ' sediment transported to Lago Loiza, a water supply reservoir. EXTREMES FOR PERIOD OF DAILY RECORD.-- SEDIMENT CONCENTRATION: Maximum daily mean, 1,040 mg/L few days; Minimum daily mean, 0 mg/L several days. SEDIMENT LOADS: Maximum daily mean, 777 tons (705 tonnes) October 06, 1985; Minimum daily mean, 0.00 tons (0.00) tonne several days. EXTREMES FOR WATER YEARS 1984-86.-- Water suspeneded-sediment concentration (mg/L) suspended-sediment discharge (tons per day) Year maximum minimum maximum minimum 1984 247 (Sep. 20) 0 (several days) 26 (Sep. 20) 0.00 (several days) 1985 1,040 (May 18) 0 (several days) 702 (May 18) 0.00 (several days) 1986 1,040 (Oct. 06) 0 (several days) 777 (Oct. 06) 0.00 (several days) SEDIMENT DISCHARGE. SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 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 .00 .00 0 .00 2 .00 .00 0 .00 3 .00 .00 0 .00 4 .00 .00 0 .00 5 .00 .00 0 .00 6 .00 --- --- .00 0 .00 7 .17 13 .02 .00 0 .00 8 .03 3 .00 .00 0 .00 9 .30 14 .03 .00 0 .00 10 .33 16 .01 .00 0 .00 11 .32 16 .01 .00 0 .00 12 .35 20 .02 .00 0 .00 13 1.5 50 .43 .00 0 .00 14 .59 33 .05 .00 0 .00 15 2.2 64 2.0 .00 0 .00 16 3.3 81 1.1 .00 0 .00 17 - .77 35 .07 .00 0 .00 18 .44 20 .02 .00 0 .00 19 .29 17 .01 .00 0 .00 20 .18 12 .01 .00 0 .00 21 .10 8 .00 .00 0 .00 22 .01 1 .00 .00 0 .00 23 .00 0 .00 .00 0 .00 24 --- .00 0 .00 .00 0 .00 25 .00 .00 0 .00 .00 0 .00 26 .00 0 .00 .00 0 .00 .00 0 .00 27 .00 0 .00 .00 0 .00 .00 0 .00 28 .00 0 .00 .00 0 .00 .00 0 .00 29 .00 0 .00 .00 0 .00 .00 0 .00 30 .00 0 .00 --- .00 0 .00 31 .00 0 .00 .00 0 .00 TOTAL 0.00 10.88 3.78 0.00 0.00 224 RIO GRANDE DE LOIZA BASIN 50055650 QUEBRADA CAIMITO NEAR JUNCOS, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 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 .00 0 .00 .00 0 .00 .09 7 .00 2 .00 0 .00 .00 0 .00 .07 4 .00 3 .00 0 .00 .00 0 .00 .03 2 .00 4 .00 0 .00 .00 0 .00 .00 0 .00 5 .00 0 .00 .00 0 .00 .00 0 .00 6 .00 0 .00 .00 0 .00 .00 0 .00 7 .00 0 .00 .00 0 .00 .32 14 .06 8 .00 0 .00 .00 0 .00 .36 20 .02 9 .00 0 .00 .00 0 .00 .19 14 .01 10 .00 0 .00 .00 0 .00 .65 31 .08 11 .00 0 .00 .00 0 .00 .49 10 .01 12 .00 0 .00 .00 0 .00 .28 2 .50 13 .00 0 .00 .00 0 .00 .17 2 .00 14 .00 0 .00 .00 0 .00 .11 2 .00 15 .00 0 .00 .00 0 .00 .00 0 .00 16 .00 0 .00 .00 0 .00 .00 0 .00 17 .00 0 .00 .00 0 .00 .00 0 .00 18 .00 0 .00 .00 0 .00 .00 0 .00 19 .00 0 .00 .00 0 .00 .00 0 .00 20 .00 0 .00 .00 0 .00 .00 0 .00 21 .00 0 .00 .00 0 .00 .00 0 .00 22 .00 0 .00 .00 0 .00 .00 0 .00 23 .00 0 .00 .00 0 .00 .00 0 .00 24 .00 0 .00 .00 0 .00 .00 0 .00 25 .00 0 .00 .00 0 .00 .00 0 .00 26 .00 0 .00 .00 0 .00 .00 0 .00 27 .01 12 .84 .00 0 .00 .00 0 .00 28 .09 7 .00 .41 21 .06 .00 0 .00 29 .00 0 .00 .05 2 .00 1.2 42 .99 30 .00 0 .00 .16 12 .01 .56 30 .05 31 --- --- --- 1.2 41 .72 --- --- --- TOTAL 0.10 0.84 1.82 0.79 4.52 1.72 JULY AUGUST SEPTEMBER 1 .17 18 .01 .44 12 .15 .00 0 .00 2 .07 5 .00 1.3 48 .22 .00 0 .00 3 .00 0 .00 .49 25 .03 .00 0 .00 4 .95 24 .59 .27 15 .01 .00 0 .00 5 1.9 57 .33 .16 10 .00 .13 7 .01 6 .94 38 .10 .01 1 .00 .15 10 .01 7 .48 23 .03 .00 0 .00 .00 0 .00 8 .23 13 .01 .00 0 .00 .00 0 .00 9 .11 7 .00 .00 0 .00 .00 0 .00 10 .01 1 .00 .00 0 .00 .00 0 .00 11 .00 0 .00 .00 0 .00 .00 0 .00 12 .00 0 .00 .00 0 .00 .34 16 .02 13 .00 0 .00 .00 0 .00 1.6 45 .95 14 .00 0 .00 .00 0 .00 1.4 38 .15 15 .00 0 .00 .00 0 .00 .77 32 .07 16 .00 0 .00 .00 0 .00 5.8 101 7.6 17 .00 0 .00 .00 0 .00 4.6 108 1.5 18 .00 0 .00 .00 0 .00 3.5 82 .82 19 .00 0 .00 .00 0 .00 2.6 47 .33 20 .00 0 .00 .00 0 .00 17 247 26 21 .00 0 .00 .00 0 .00 7.0 147 3.0 22 .00 0 .00 .00 0 .00 2.8 70 .53 23 .00 0 .00 .00 0 .00 1.4 45 .17 24 .00 0 .00 .00 0 .00 .94 40 .10 25 .00 0 .00 .00 0 .00 .72 30 .06 26 .00 0 .00 7.4 117 15 .58 28 .04 27 .00 0 .00 2.4 69 .77 .47 25 .03 28 .00 0 .00 .52 30 .04 .46 22 .03 29 1.4 28 .71 .27 15 .01 .41 22 .02 30 .56 25 .04 .13 10 .00 .43 20 .02 31 .15 10 .00 .09 7 .00 --- --- --- TOTAL 6.97 1.82 13.48 16.23 53.10 41.46 YEAR 90.87 66.64 225 RIO GRANDE DE LOIZA BASIN 50055650 QUEBRADA CAIMITO NEAR JUNCOS, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) OCTOBER NOVEMBER DECEMBER 1 .33 20 .02 .48 22 .03 .43 4 .20 2 .50 25 .03 1.0 44 .24 1.4 25 .22 3 1.1 41 .21 12 244 17 .54 6 .01 4 .51 25 .03 12 234 27 .42 2 .60 5 .44 20 .02 31 383 50 .38 2 .00 6 .45 25 .03 68 724 174 .33 2 .00 7 .33 20 .02 41 437 67 .33 2 .00 8 .29 18 .01 17 230 12 .33 2 .00 9 1.8 54 .72 12 220 8.5 .34 2 .00 10 1.6 55 .32 6.3 120 2.0 .33 2 .20 11 1.2 45 .15 3.4 80 .73 .31 2 .50 12 .86 35 .08 1.8 60 .29 .29 2 .80 13 .64 27 .05 1.1 50 .15 .25 3 .00 14 16 260 59 2.6 60 .42 .23 3 .00 15 2.8 80 .60 2.8 60 .45 .24 3 .20 16 1.1 40 .12 1.7 35 .16 .33 3 .20 17 .80 32 .07 1.7 12 .06 .46 3 .50 18 .64 27 .05 1.2 8 .03 .28 3 .50 19 .50 25 .03 1.0 7 .02 .27 4 .00 20 .46 25 .03 .91 7 .02 .25 4 .00 21 .45 25 .03 .79 6 .80 .23 4 .00 22 .37 20 .02 .71 6 .50 .24 4 .00 23 .32 18 .02 .77 6 .01 .24 4 .00 24 .26 17 .01 .72 5 .50 .30 4 .00 25 .53 25 .04 .70 5 .01 .34 4 .00 26 .33 20 .02 .62 5 .01 .29 4 .00 27 .28 18 .01 .52 5 .01 .38 4 .00 28 .38 20 .02 .48 4 .70 .41 4 .00 29 .49 27 .04 .42 4 .50 .29 3 .70 30 .32 20 .02 .41 4 .20 .38 3 .20 31 .25 17 .01 --- --- .40 3 .00 TOTAL 36.33 61.83 225.13 363.34 11.24 4.83 226 RIO GRANDE DE 1012A BASIN 50055650 QUEBRADA CAIMITO NEAR JUNCOS, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) JANUARY FEBRUARY MARCH '1 .56 20 .03 .10 2 .20 .15 6 .00 2 2.1 65 2.4 .07 2 .00 .04 2 .00 3 .00 0 .00 .05 1 .90 .00 0 .00 4 .05 4 .50 .04 1 .30 .00 0 .00 5 .04 4 .30 .02 0 .90 .07 5 .00 6 .04 4 .00 .01 0 .50 .05 6 .00 7 .07 4 .00 .00 0 .00 .14 3 .00 8 .09 4 .00 .00 0 .00 .21 2 .00 9 .11 4 .00 .00 0 .00 .16 2 .00 10 .16 4 .00 .00 0 .00 .06 1 .00 11 .23 4 .00 .00 0 .00 .00 0 .00 12 .23 4 .00 .00 0 .00 .00 0 .00 13 .21 4 .00 .00 0 .00 .00 0 .00 14 .21 4 .00 .00 0 .00 .00 0 .00 15 .20 4 .00 .00 0 .00 .00 0 .00 16 .20 4 .00 .00 0 .00 .00 0 .00 17 .20 4 .10 .00 0 .00 .00 0 .00 18 .20 4 .10 .01 0 .00 .03 2 .00 19 .17 4 .00 .00 0 .00 .00 0 .00 20 .16 3 .90 .00 0 .00 .00 0 .00 21 .14 3 .60 .00 0 .00 .00 0 .00 22 .14 3 .40 .00 0 .00 .00 0 .00 23 .13 3 .20 .00 0 .00 .00 0 .00 24 .13 3 .20 .00 0 .00 .00 0 .00 25 .13 3 .00 .00 0 .00 .00 0 .00 26 .14 2 .90 .00 0 .00 .00 0 .00 27 .12 2 .80 .11 8 .00 .00 0 .00 28 .12 2 .60 .60 29 .22 .07 5 .00 29 .10 2 .50 --- --- --- 6.8 159 11 30 .09 2 .30 .41 20 .02 31 .08 2 .20 .25 12 .01 TOTAL 6.55 9.03 1.01 3.02 8.44 11.03 APRIL MAY JUNE 1 .14 10 .00 .06 5 .00 .25 1 .10 2 .10 8 .00 .12 20 .01 .22 1 .20 3 .06 5 .00 .10 25 .01 .20 1 .50 4 .03 2 .00 .08 4 .50 .19 1 .60 5 .00 0 .00 .07 4 .20 .17 2 .00 6 .00 0 .00 .07 4 .00 .15 1 .70 7 .01 0 .00 .05 3 .50 .13 1 .50 8 .00 0 .00 .04 3 ,00 .12 1 .30 9 .01 0 .00 .03 3 .00 .11 1 .00 10 .00 0 .00 .02 2 .00 .09 1 .00 11 .00 0 .00 .02 2 .00 .08 0 .80 12 .00 0 .00 .08 4 .00 .05 0 .50 13 .01 0 .00 .04 3 .00 .03 0 .20 14 .00 0 .00 .64 37 .39 .00 0 .00 15 .01 2 .00 57 766 372 .00 0 .00 16 .20 5 .00 15 99 7.4 .00 0 .00 17 .12 2 .00 28 310 75 .00 0 .00 18 .06 3 .00 129 1040 702 .00 0 .00 19 .02 2 .00 16 189 12 .00 0 .00 20 .00 0 .00 4.7 30 .38 .,.., 0 .00 21 .00 0 .00 2.0 12 .06 .00 0 .00 22 .00 0 .00 1.1 10 .03 .00 0 .00 23 5.2 100 9.3 .74 10 .02 .00 0 .00 24 .98 30 .08 .57 4 .01 .00 0 .00 25 .32 18 .02 .48 1 .90 .00 0 .00 26 .19 12 .01 .42 1 .80 .00 0 .00 27 .13 10 .00 .37 1 .20 .00 0 .00 28 .09 8 .00 .33 1 .00 .00 0 .00 29 .08 7 .00 .33 1 .00 .00 0 .00 30 .07 6 .00 .32 1 .00 .00 0 .00 31 --- --- --- .28 1 .10 --- --- TOTAL 7.83 9.41 258.06 1172.51 1.79 4.40 227 R10 GRANDE DE LOIZA BASIN 50055650 QUEBRADA CAIMITO NEAR JUNCOS, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) JULY AUGUST SEPTEMBER 1 .00 0 .00 .01 1 .00 .00 0 .00 2 .00 0 .00 1.9 48 .70 .00 0 .00 3 .00 0 .00 1.8 42 .37 .00 0 .00 4 .00 0 .00 .00 0 .00 .00 0 .00 5 .00 0 .00 .00 0 .00 .00 0 .00 6 .00 0 .00 .00 0 .00 .,,O 0 .00 7 .00 0 .00 .00 0 .00 .00 0 .00 8 .00 0 .00 .00 0 .00 .00 0 .00 9 .00 0 .00 .00 0 .00 .86 40 .09 10 .00 0 .00 .00 0 .00 1.3 48 .17 11 .00 0 .00 .00 0 .00 1.1 40 .12 12 .00 0 .00 .00 0 .00 4.2 82 2.6 13 .00 0 .00 .00 0 .00 18 295 22 14 .00 0 .00 .00 0 .00 5.8 105 1.7 15 .28 11 .03 .00 0 .00 2.4 60 .39 16 1.2 46 .38 .00 0 .00 1.3 50 .18 17 1.4 54 .41 .00 0 .00 .70 35 .07 18 .24 14 .01 .00 0 .00 .39 20 .02 19 .04 2 .00 .00 0 .00 .27 15 .01 20 2.7 76 1.8 .00 0 .00 .19 10 .01 21 .87 25 .06 .00 0 .00 .15 10 .00 22 .32 20 .02 .00 0 .00 .10 10 .00 23 .27 19 .01 .00 0 .00 .29 16 .03 24 .29 18 .01 .00 0 .00 .75 34 .09 25 .18 15 .01 .00 0 .00 6.1 141 3.8 26 .11 10 .00 .00 0 .00 1.9 56 .30 27 .00 0 .00 .00 0 .00 1.0 40 .11 28 .05 5 .00 .00 0 .00 1.1 41 .13 29 .04 4 .00 .00 0 .00 .76 32 .07 30 .00 0 .00 .00 0 .00 .62 30 .05 31 .00 0 .00 .00 0 .00 --- --- --- TOTAL 7.99 2.74 3.71 1.07 49.28 31.94 YEAR 617.36 1675.15 228 RIO GRANDE DE LOIZA BASIN 50055650 QUEBRADA CAIMITO NEAR JUNCOS, 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 3.6 97 3.4 3.3 70 .62 .51 18 .02 2 21 292 36 2.5 60 .41 .46 15 .02 3 4.3 48 .63 1.9 50 .26 .40 15 .02 4 8.0 113 21 1.5 50 .20 .37 15 .01 5 7.3 174 4.8 1.3 45 .16 .61 18 .03 6 136 1040 777 1.1 45 .13 .51 18 .02 7 71 553 207 .99 40 .11 .36 14 .01 8 14 261 13 .80 35 .08 .30 10 .01 9 5.8 120 1.9 .76 30 .06 .28 8 .01 10 3.3 75 .67 .68 25 .05 .24 6 .00 11 2.3 58 .36 .82 30 .07 .22 5 .00 12 1.7 52 .24 2.4 65 .57 .22 5 .00 13 1.0 48 .13 4.4 140 13 .22 5 .00 14 .70 40 .08 1.6 60 .26 .23 8 .00 15 .50 30 .04 30 405 66 .29 8 .01 16 .35 25 .02 11 209 7.7 .24 8 .01 17 .33 22 .02 3.7 90 .90 .26 8 .01 18 11 218 52 3.7 70 .70 .26 8 .01 19 3.5 80 .76 2.1 45 .26 .27 7 .80 20 1.6 50 .22 1.4 40 .15 .23 7 .20 21 .94 40 .10 2.2 35 .21 .22 6 .50 22 .65 35 .06 1.1 20 .06 .24 6 .00 23 8.3 150 2.8 .91 35 .09 .22 5 .00 24 23 334 33 1.0 35 .09 .22 5 .00 25 13 221 9.0 .75 30 .06 .35 4 .80 26 5.3 110 1.6 .64 28 .05 .26 4 .50 27 3.4 80 .73 .60 25 .04 .22 4 .10 28 2.8 70 .53 .51 22 .03 .25 3 .90 29 7.0 100 1.4 .51 22 .03 .30 3 .50 30 4.2 90 1.0 .52 20 .03 .31 3 .00 31 4.4 100 1.2 --- --- .31 2 .70 TOTAL 370.27 1170.69 84.69 92.38 9.38 5.19 229 RIO GRANDE DE LOIZA BASIN 50055650 QUEBRADA CAIMITO NEAR JUNCOS, 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 .37 2 .40 .19 2 .10 .13 6 .80 2 .35 2 .00 .24 2 .10 .12 7 .00 3 .31 2 .00 .48 18 .02 .12 7 .00 4 .36 2 .00 .70 25 .05 .14 7 .00 5 .30 2 .00 .32 12 .01 .12 7 .00 6 .27 2 .00 .19 8 .00 .14 7 .00 7 .27 2 .00 .18 8 .00 .13 7 .00 8 .27 2 .00 .19 7 .50 .11 7 .00 9 1.4 2 .01 .18 7 .20 .12 7 .00 10 .43 2 .00 .18 7 .10 .12 7 .00 11 .27 2 .00 .21 7 .00 .16 7 .00 12 .24 2 .00 .20 6 .80 .13 7 .20 13 .25 2 .00 .18 6 .40 .17 8 .00 14 .24 2 .00 .16 6 .00 .32 10 .03 15 .20 2 .00 .12 6 .00 .41 19 .07 16 .24 2 .00 .12 6 .00 .09 7 .00 17 .27 2 .00 .14 6 .00 .08 6 .00 18 .25 2 .00 .12 6 .00 .08 6 .00 19 .24 2 .00 .12 6 .00 .'1 6 .00 20 .22 2 .00 .13 6 .00 .09 6 .00 21 .25 2 .00 .10 6 .00 .08 6 .00 22 .23 2 .00 .12 6 .00 .07 6 .00 23 .28 2 .00 .13 6 .00 .09 6 .00 24 .39 2 .00 .14 6 .10 .09 6 .00 25 .30 2 .00 .17 6 .10 .12 6 .00 26 .26 2 .00 .15 6 .10 .14 6 .10 27 .24 2 .00 .13 6 .10 .13 6 .20 28 .22 2 .00 .13 6 .20 .10 6 .20 29 .21 2 .20 --- .59 13 .05 30 .25 2 .20 .14 11 .00 31 .21 2 .20 .21 9 .01 TOTAL 9.59 1.01 5.42 2.88 4.62 1.66 APRIL MAY JUNE 1 .17 9 .00 .09 8 .00 2.4 55 .36 2 .13 8 .50 .06 3 .00 1.6 45 .19 3 .11 8 .00 .05 3 .00 1.1 40 .12 4 .17 10 .00 .03 3 .00 .55 30 .04 5 1.6 46 .31 .03 3 .00 .45 20 .02 6 .53 25 .04 .04 3 .00 .27 18 .01 7 .17 11 .01 .38 20 .02 .25 18 .01 8 .15 10 .00 .35 20 .02 .20 17 .01 9 .14 10 .00 11 661 423 1.2 40 .13 10 .10 8 .00 5.8 132 3.1 .25 15 .01 11 .09 7 .00 6.7 123 2.4 .15 10 .00 12 .09 7 .00 2.4 63 .43 .12 9 .50 13 .08 6 .00 32 461 153 .12 9 .00 14 .07 5 .00 23 183 27 .14 9 .00 15 .06 5 .00 4.6 40 .50 .14 9 .00 16 .05 5 .00 1.7 40 .18 .19 9 .00 17 .05 5 .00 .70 30 .06 .15 8 .80 18 .04 4 .20 1.0 30 .08 .12 8 .20 19 .03 4 .20 .51 22 .03 .11 7 .80 20 .04 4 .00 .27 18 .01 .09 7 .00 21 .04 4 .00 .27 16 .01 .07 5 .50 22 .03 4 .00 .25 15 .01 .06 5 .00 23 .03 4 .00 .18 14 .01 .05 4 .20 24 .03 4 .00 .14 12 .00 .04 3 .50 25 .02 4 .00 .11 12 .00 .03 2 .50 26 .02 4 .00 .11 11 .00 .03 4 .00 27 .10 10 .00 .10 10 .00 .08 6 .00 28 .20 8 .00 .09 10 .00 .03 3 .20 29 3.0 75 5.2 .09 9 .00 .02 3 .00 30 1.0 40 .11 .09 8 .00 .01 2 .50 31 --- --- 6.1 113 3.0 --- --- --- TOTAL 8.34 6.57 98.24 612.86 10.02 5.60 230 RIO GRANDE DE LOIZA BASIN 50055650 QUEBRADA CAIMITO NEAR JUNCOS, 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 .00 0 .00 .15 10 .00 2.9 60 .47 2 .01 2 .00 .05 4 .50 1.9 50 .26 3 .02 2 .00 .04 2 .00 1.! 40 .12 4 .01 2 .00 .02 1 .00 ./5 35 .07 5 .00 0 .00 .00 0 .00 .58 25 .04 6 .50 37 .43 .00 0 .00 1.5 50 .20 7 .13 10 .00 .01 2 .00 .67 30 .05 8 .04 3 .00 .01 2 .00 .28 18 .01 9 .02 2 .00 .00 0 .00 .15 10 .00 10 .00 0 .00 .00 0 .00 .11 7 .50 11 .01 2 .00 .34 50 .05 .09 6 .50 12 .04 2 .00 .03 4 .00 .07 6 .00 13 .01 2 .00 .01 2 .00 .71 25 .12 14 .02 3 .00 .03 3 .00 .25 18 .01 15 .11 5 .00 .00 0 .00 .07 4 .50 16 .03 3 .00 .30 25 .02 .04 3 .00 17 .01 1 .00 .02 2 .00 ' .00 0 .00 18 .00 0 .00 .01 1 .00 .00 0 .00 19 .00 0 .00 .00 0 .00 .00 0 .00 20 .00 0 .00 .00 0 .00 .00 0 .00 21 .00 0 .00 .00 0 .00 .00 0 .00 22 .00 0 .00 .00 0 .00 .00 0 .00 23 .00 0 .00 .00 0 .00 .05 7 .00 24 .00 0 .00 .00 0 .00 .02 3 .00 25 .00 0 .00 .00 0 .00 .03 5 .00 26 .00 0 .00 .00 0 .00 .01 2 .00 27 .00 0 .00 .00 0 .00 .00 0 .00 28 .00 0 .00 7.4 84 26 .00 0 .00 29 .11 8 .50 28 423 149 .00 0 .00 30 5.0 173 21 4.8 120 1.6 .00 0 .00 31 1.1 50 .15 5.0 100 1.4 --- --- TOTAL 7.17 22.08 46.22 178.57 11.28 2.85 YEAR 665.24 2102.34 231 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 from Quebrada Don Victor, 1.7 mi (2.7 km) upstream from Rio Gurabo and 1.0 mi (1.6 km) south of Juncos. DRAINAGE AREA.--16.4 mi' (42.5 km 2 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--January 1971 to current year. GAGE.--Water-stage recorder. Elevation of gage is 320 ft (98 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. Minor diversion from public water supply tank, 0.5 mi upstream, during low flow. AVERAGE DISCHARGE.--17 years (1972-88), 54.5 ft'/s (1.543 m'/s), 45.13 in/yr (1,150 mm/yr), 39,480 acre-ft/yr (48.7 NIP/yr); median of yearly mean discharges, 52 ft)/s (1.47 m'/s), 37,700 acre-ft/yr (46 hm'/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 40,000 ft'/s (1,130 m'/s), Dec. 8, 1987, gage height, 25.63 ft (7.812 m), from floodmark and rating curve extended above 100 ft'/s (2.83 m'/s) on basis of slope-area measurement and step-backwater analysis; minimum discharge, 1.4 ft'is (0.040 m'/s), Apr. 21, 1988, result of diversion. EXTREMES OUTSIDE PERIOD OF RECORD.--Approximate discharges (no stages were recorded) of major floods are as follows: Sept. 6, 1960, 37,100 ft'/s (1,050 m'/s); Oct. 9, 1970, 18,200 ft'/s (515 m'/s). EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 3,400 ft'is (96.3 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (m'/s) (ft) (m) Date Time (W/s) (e/s) (ft) (m) Oct.18 1830 12,200 346 14.55 4.435 Dec. 8 unknowm *40,000 1,130 *25.63 7.812 Nov.24 1445 6,530 185 10.57 3.222 July 7 0045 3,490 98.8 7.74 2.359 Nov.27 unknowm 27,500 779 21.99 6.703 Aug. 24 1500 11,300 320 13.98 4.261 Dec. 7 1900 34,600 980 24.17 7.367 Sept.11 1145 4,270 121 8.48 2.585 Minimum discharge, 1.4 ft'/s (0.040 m'/s), Apr. 21. result of diversion. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 13 20 94 44 22 29 6.1 7.8 9.3 175 18 29 2 7.8 18 143 41 22 e28 6.1 5.5 7.7 221 17 25 3 15 17 78 37 26 e15 5.7 4.2 7.0 36 20 23 4 14 54 76 36 20 e13 5.9 3.8 6.9 21 24 22 5 10 53 69 51 23 e13 6.5 4.4 5.9 18 17 21 6 14 53 206 57 19 e12 12 151 5.2 98 15 20 7 14 39 5690 46 17 el2 14 28 4.7 613 71 21 8 8.5 26 e9100 44 21 e12 8.4 12 4.8 44 35 20 9 9.0 23 e150 45 27 13 7.3 8.5 11 30 25 77 10 11 21 e120 47 23 11 6.9 31 14 42 78 50 11 7.0 19 elOO 52 25 11 6.5 27 6.1 46 130 783 12 6.4 38 e90 49 22 10 5.9 16 6.5 31 45 300 13 6.0 24 e85 44 50 11 5.7 15 17 25 27 100 14 278 19 e78 42 22 12 5.2 17 11 174 21 105 15 75 18 e73 36 22 10 8.7 20 109 -32 23 68 16 52 18 e68 33 20 9.6 8.8 14 108 24 23 54 17 371 23 e66 34 18 10 5.6 14 32 24 28 42 18 1260 19 59 30 17 11 11 13 15 32 27 37 19 140 17 57 29 16 9.3 7.1 13 12 40 19 213 20 54 18 62 27 17 12 5.3 36 157 24 18 68 21 38 15 60 26 15 11 5.7 46 107 19 17 43 22 28 14 80 23 15 11 4.2 15 51 72 65 38 23 26 38 61 23 15 11 5.1 11 27 34 48 35 24 21 2480 52 22 16 9.6 5.4 10 32 22 1260 31 25 27 366 47 22 16 12 4.3 8.0 19 24 259 29 26 26 673 50 21 31 11 4.1 8.6 18 24 59 27 27 29 e9000 54 22 53 13 4.2 11 16 20 57 26 28 34 422 51 22 16 9.2 4.4 5.6 21 34 48 25 29 26 165 45 22 14 7.8 4.4 11 16 31 40 25 30 21 111 40 20 --- 8.1 6.3 31 15 25 37 23 31 24 --- 44 20 6.6 --- 25 --- 20 29 --- TOTAL 2665.7 13821 17048 1067 640 374.2 196.8 623.4 872.1 2075 2600 2380 MEAN 86.0 461 550 34.4 22.1 12.1 6.56 20.1 29.1 66.9 83.9 79.3 MAX 1260 9000 9100 57 53 29 14 151 157 613 1260 783 MIN 6.0 14 40 20 14 6.6 4.1 3.8 4.7 18 15 20 AC-FT 5290 27410 33810 2120 1270 742 390 1240 1730 4120 5160 4720 CFSM 5.24 28.1 33.5 2.10 1.35 .74 .40 1.23 1.77 4.08 5.11 4.84 IN. 6.05 31.35 38.67 2.42 1.45 .85 .45 1.41 1.98 4.71 5.90 5.40 WTR YR 1988 TOTAL 44363.2 MEAN 121 MAX 9100 MIN 3.8 AC-FT 87990 CFSM 7.39 IN. 100.63 e Estimated 232 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 1987 TO SEPTEMBER 1988 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) OCT, 13 1305 5.6 235 28.0 MAR, 01 1259 16.6 257 25.0 NOV, 16 1223 18.6 240 26.5 APR, 07 1226 11.2 225 27.0 DEC, 09 -- 158 -- 24.5 MAY, 04 1317 4.34 265 29.0 JAN, 08 1100 45.1 235 23.5 JUN. 01 0918 10.8 228 25.0 FEB, 03 1401 28.6 240 26.0 JUL, 13 1342 22 250 29.5 233 RIO GRANDE DE LOIZA BASIN 50056400 RIO VALENCIANO NEAR JUNCOS, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORD.-- Water years 1984 to 1986 PERIOD OF DAILY RECORD.-- SUSPENDED-SEDIMENT DISCHARGE: October 1983 to September 1986. INSTRUMENTATION.-- USD-49 and automatic sediment sampler. REMARKS.-- The suspended-sediment data included in this report is part of a 5-year hydrologic investigation conducted in the Rio Grande de Loiza Basin to account the amount of suspended- sediment transported to Lago Loiza, a water supply reservoir. EXTREMES FOR PERIOD OF DAILY RECORD.-- SEDIMENT CONCENTRATION: Maximum daily mean, 1,600 mg/L October 06, 1985; Minimum daily mean, 1 mg/1 several days. SEDIMENT LOADS: Maximum daily mean, 46,300 tons (42,000 tonnes) May 18. 1985; Minimum daily mean, 0.01 tons (0.01) tonne several days. EXTREMES FOR WATER YEARS 1984-86.-- Water suspeneded-sediment concentration (mg/L) suspended-sediment discharge (tons per day) Year maximum minimum maximum minimum 1984 741 (Jun. 10) 1 (several days) 4,990 (Nov. 05) 0.01 (several days) 1985 1,580 (May 18) 2 (several days) 46,300 (May 18) 0.05 (several days) 1986 1,600 (Oct. 06) 5 (several days) 25,100 (May 13) 0.10 (several days) SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 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 27 23 2.4 24 20 1.3 17 7 .32 2 21 15 .85 18 13 .63 196 165 314 3 24 15 .97 20 12 .65 32 20 1.7 4 20 12 .65 724 494 1640 23 13 .81 5 19 12 .62 775 556 3370 22 11 .65 6 18 12 .58 469 241 312 29 11 .86 7 19 12 .62 61 50 8.2 22 11 .65 8 20 12 .65 41 30 3.3 22 10 .59 9 40 24 4.7 33 20 1.8 20 10 .54 10 20 12 .65 28 15 1.1 20 10 .54 11 17 10 .46 25 15 1.0 20 11 .59 12 26 17 1.2 24 14 .91 19 10 .51 13 20 18 .97 23 14 .87 18 10 .49 14 17 15 .69 22 13 .77 17 10 .46 15 19 17 .87 21 13 .74 18 10 .49 16 21 15 .85 22 12 .71 18 10 .49 17 17 10 .46 21 11 .62 18 9 ,44 18 32 31 16 20 10 .54 18 9 .44 19 39 39 10 19 10 .51 17 9 .41 20 19 10 .51 19 9 .46 16 9 .39 21 17 10 .46 18 8 .39 16 9 .39 22 16 10 .43 17 6 .28 18 10 .49 23 15 10 .41 18 10 .49 18 10 .49 24 14 9 .34 17 11 .50 16 10 .43 25 14 9 .34 17 11 .50 15 10 .41 26 44 34 7.7 16 10 .43 16 10 .43 27 17 11 .50 16 9 .39 19 10 .51 28 15 10 .41 15 8 .32 16 10 .43 29 20 12 .65 16 8 .35 17 10 .46 30 23 15 .93 17 7 .32 20 9 ,49 31 27 18 1.3 --- --- --- 19 9 .46 TOTAL 677 58.17 2576 5350.08 772 330.36 234 RIO GRANDE DE LOIZA BASIN 50056400 RIO VALENCIANO NEAR JUNCOS, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) JANUARY FEBRUARY MARCH • 1 17 9 .41 12 2 .06 14 18 .68 2 15 9 .36 12 2 .06 13 18 .63 3 14 8 .30 12 2 .06 12 16 .52 4 14 8 .30 14 3 .11 11 14 .42 5 14 8 .30 12 2 .06 12 11 .36 6 13 8 .28 13 4 .14 12 11 .36 7 13 7 .25 14 3 .11 12 10 .32 8 13 6 .21 13 2 .07 12 10 .32 9 14 5 .19 13 2 .07 12 8 .26 10 16 5 .22 17 5 .23 12 6 .19 11 14 5 .19 22 25 1.5 11 4 .12 12 13 5 .18 18 17 .83 11 3 .09 13 27 21 4.5 134 126 174 11 1 .03 14 30 25 2.0 35 52 4.9 11 2 .06 15 17 10 .46 205 153 507 11 2 .06 16 16 10 .43 603 413 1510 11 3 .09 17 15 10 .41 41 50 5.5 11 3 .09 18 15 8 .32 26 33 2.3 11 4 .12 19 14 5 .19 21 31 1.8 10 4 .11 20 51 51 15 19 31 1.6 10 3 .08 21 20 12 .65 17 31 1.4 10 3 .08 22 17 10 .46 16 31 1.3 10 4 .11 23 14 10 .38 15 30 1.2 10 3 .08 24 13 10 .35 15 30 1.2 10 4 .11 25 18 9 .44 14 26 .98 10 4 .11 26 14 5 .19 14 24 .91 10 5 .14 27 14 4 .15 15 22 .89 9.5 5 .13 28 14 4 .15 15 22 .89 9.0 5 .12 29 13 3 .11 13 20 .70 9.0 5 .12 30 13 3 .11 --- --- --- 8.5 4 .09 31 12 2 .06 8.5 4 .09 TOTAL 517 29.55 1390 2219.87 334.5 6.09 APRIL MAY JUNE 1 8.5 4 .09 5.8 1 .02 35 20 1.9 2 8.5 4 .09 5.7 1 .02 26 15 1.1 3 8.5 4 .09 5.7 1 .02 18 10 .49 4 8.5 4 .09 7.1 1 .02 46 45 11 5 8.5 4 .09 5.8 1 .02 21 14 .79 6 8.5 4 .09 5.3 1 .01 128 146 92 7 9.0 5 .12 5.6 1 .02 209 222 270 8 8.2 4 .09 5.8 1 .02 83 70 16 9 7.1 4 .08 6.2 1 .02 43 50 5.8 10 7.2 3 .06 6.3 1 .02 983 741 4990 11 7.8 2 .04 4.2 1 .01 170 181 12" 12 7.1 2 .04 5.0 1 .01 66 45 4.5 13 7.3 2 .04 19 1 .05 241 236 626 14 6.6 2 .04 11 2 .06 87 55 13 15 6.4 2 .03 7.4 1 .02 48 35 4.5 16 6.1 2 .03 7.2 1 .02 37 28 2.8 17 6.8 2 .04 6.6 1 .02 33 45 4.0 18 6.5 2 .04 6.0 1 .02 30 20 1.6 19 6.6 2 .04 5.5 2 .03 43 35 4.1 20 9.1 5 .12 5.7 2 .03 34 28 2.6 21 7.4 5 .10 6.6 2 .04 26 18 1.3 22 8.7 4 .09 6.4 2 .03 23 12 .75 23 6.9 2 .04 15 2 .08 20 12 .65 24 6.6 2 .04 9.0 2 .05 19 10 .51 25 6.2 1 .02 17 20 .92 19 10 .51 26 6.0 1 .02 55 61 23 18 10 .49 27 12 1 .03 16 10 .43 17 10 .46 28 14 1 .04 39 33 5.9 17 10 .46 29 6.6 1 .02 21 10 .57 25 2.2 30 6.3 1 .02 296 308 1030 20 12 .65 31 --- --- 75 71 21 --- --- TOTAL 233.5 1.77 692.9 1082.48 2592 6182.16 23.5 RIO GRANDE DE LOIZA BASIN 50056400 RIO VALENCIANO NEAR JUNCOS, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 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 19 10 .51 20 10 .54 14 10 .38 2 30 20 1.6 72 64 18 16 10 .43 3 17 10 .46 23 12 .75 21 10 .57 4 18 10 .49 41 37 7.3 25 10 .68 5 68 69 20 25 18 1.2 55 15 2.2 6 24 15 .97 19 10 .51 70 35 6.6 7 19 10 .51 17 10 .46 28 35 2.6 8 17 10 .46 15 10 .41 18 10 .49 9 15 9 .36 16 10 .43 16 10 .43 10 27 15 1.1 15 10 .41 18 10 .49 11 21 15 .85 14 10 .38 28 10 .76 12 15 10 .41 14 10 .38 40 33 6.1 13 14 10 .38 13 9 .32 334 310 1460 14 24 25 1.6 13 8 .28 686 593 2940 15 25 20 1.4 13 8 .28 80 70 15 16 15 10 .41 13 8 .28 195 173 37^, 17 14 10 .38 13 8 .28 333 353 696 18 13 9 .32 13 8 .28 323 423 822 19 12 8 .26 12 8 .26 138 120 45 20 14 7 .26 12 8 .26 414 371 855 21 23 20 1.2 12 8 .26 151 150 61 22 21 15 .85 13 8 .28 81 70 15 23 22 10 .59 12 7 .23 65 55 9.7 24 15 10 .41 12 7 .23 55 45 6.7 25 13 10 .35 12 6 .19 55 40 5.9 26 12 10 .32 230 77 31 47 35 4.4 27 14 10 .38 300 119 59 53 30 4.3 28 14 10 .38 60 50 8.1 50 30 4.1 29 54 45 23 40 30 3.2 43 30 3.5 30 60 64 17 60 25 4.1 51 30 4.1 31 22 13 .77 20 18 .97 --- --- --- TOTAL 691 77.98 1164 140.57 3503 7346.43 YEAR 15142.9 22825.51 238 RIO GRANDE DE LOIZA BASIN 50056400 RIO VALENCIANO NEAR JUNCOS, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) OCTOBER NOVEMBER DECEMBER 1 44 35 4.2 93 100 43 30 18 1.5 2 43 25 2.9 325 250 558 45 44 7.0 3 65 53 9.6 1350 460 811 41 48 5.3 4 46 35 4.3 330 200 203 31 50 4.2 5 42 32 3.6 860 605 1830 29 50 3.9 6 59 45 8.2 920 455 929 28 46 3.5 7 68 65 14 470 180 228 26 42 2.9 8 53 45 6.4 170 65 30 25 40 2.7 9 138 116 71 116 40 13 30 45 3.6 10 121 119 50 112 39 12 28 45 3.4 11 80 62 12 85 39 9.0 205 184 608 12 70 55 10 74 37 7.4 216 345 786 13 96 87 30 67 35 6.3 59 90 14 14 85 103 30 93 85 40 37 60 6.0 15 80 75 16 93 111 32 32 60 5.2 16 62 65 11 60 85 14 28 59 4.5 17 53 40 5.4 57 80 12 30 58 4.7 18 45 30 3.6 54 75 11 73 57 3.5 19 41 28 3.1 47 70 8.9 .4 55 3.6 20 51 35 4.8 43 68 7.9 23 40 2.5 21 40 25 2.7 40 62 6.7 22 35 2.1 22 38 22 2.3 39 60 6.3 21 35 2.0 23 36 20 1.9 46 60 7.5 21 33 1.9 24 34 20 1.8 37 50 5.0 24 40 2.6 25 61 93 21 35 52 4.9 31 45 3.8 26 44 86 10 36 50 4.9 26 55 3.9 27 38 50 5.1 35 51 4.8 24 55 3.6 28 44 55 6.5 33 58 5.2 27 47 3.4 29 35 25 2.4 35 60 5.7 21 35 2.0 30 31 22 1.8 33 20 1.8 26 35 2.5 31 32 40 3.5 --- --- --- 21 30 1.7 TOTAL 1775 359.1 5788 4858.3 1254 1505.5 237 RIO GRANDE OE LOIZA BASIN 50056400 RIO VALENCIANO NEAR JUNCOS. PR--Continued SEDIMENT DISCHARGE. SUSPENDED (TONS/DAY). WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) JANUARY FEBRUARY MARCH 1 35 44 9.5 17 25 1.1 18 45 2.2 2 46 55 6.8 14 21 .79 12 42 1.4 3 25 40 2.7 13 21 .74 13 40 1.4 4 31 47 3.9 13 22 .77 11 40 1.2 5 26 30 2.1 12 22 .71 13 30 1.1 6 29 42 3.3 12 22 .71 16 20 .86 7 22 42 2.5 11 20 .59 52 71 16 8 21 41 2.3 11 19 .56 36 20 1.9 9 19 45 2.3 11 19 .56 17 20 .92 10 20 50 2.7 11 18 .53 14 12 .45 11 20 50 2.7 12 15 .49 13 11 .39 12 18 57 2.8 11 15 .45 13 10 .35 13 18 56 2.7 10 17 .46 12 9 .29 14 17 56 2.6 12 15 .49 11 9 .27 15 16 58 2.5 13 15 .53 9.8 8 .21 16 16 60 2.6 12 15 .49 10 9 .24 17 16 60 2.6 12 14 .45 11 9 .27 18 16 50 2.? 13 12 .42 26 24 1.7 19 16 48 2.1 13 15 .53 13 15 .53 20 16 48 2.1 21 20 1.1 11 6 .18 21 16 48 2.1 13 9 .32 10 5 .14 22 16 48 2.1 12 8 .26 10 5 .14 23 15 49 2.0 12 9 .29 10 4 .11 24 15 50 2.0 12 9 .29 9 1 2 .05 25 15 49 2.0 12 10 .32 9.1 2 .05 26 18 45 2.2 11 10 .30 11 5 .15 27 16 40 1.7 22 17 1.4 10 6 .16 28 16 38 1.6 44 64 15 10 6 .16 29 15 35 1.4 --- --- --- 509 490 2160 30 14 30 1.1 53 42 11 31 14 28 1.1 48 65 8.4 TOTAL 613 82.3 392 30.65 1021.2 2214.22 APRIL MAY JUNE 1 23 18 1.1 15 10 .41 24 7 .45 2 18 10 .49 14 10 .38 23 8 .50 3 14 9 .34 15 10 .41 21 8 .45 4 13 8 .28 14 10 .38 20 8 .43 5 12 7 .23 15 10 .41 21 8 .45 6 13 7 .25 11 13 .60 20 5 .27 7 16 5 .22 13 9 .32 20 5 .27 8 14 5 .19 13 9 .32 25 8 .54 9 14 5 .19 15 10 .41 21 10 .57 10 11 10 .30 13 10 .35 20 12 .65 11 25 30 2.0 15 10 .41 18 11 .53 12 26 20 1.4 30 20 1.6 19 10 .51 13 17 10 .46 21 20 1.1 17 9 .41 14 14 10 .38 245 246 285 17 8 .37 15 21 10 .57 2250 1090 14100 16 8 .35 16 27 10 .73 284 298 727 15 10 .41 17 21 10 .57 751 557 1670 14 10 .38 18 15 10 .41 3910 1580 46300 14 10 .38 19 15 10 .41 180 190 92 13 10 .35 20 12 10 .32 84 70 16 13 9 .32 21 12 10 .32 63 50 8.5 12 5 .16 22 13 10 .35 51 40 5.5 12 5 .16 23 530 372 1500 43 35 4.1 13 5 .18 24 144 193 149 41 30 3.3 12 5 .16 25 83 90 20 40 25 2.7 12 5 .16 26 46 80 9.9 36 20 1.9 11 5 .15 27 26 20 1.4 32 18 1.6 12 5 .16 28 20 12 .65 31 20 1.7 11 5 .15 29 18 10 .49 28 15 1.1 11 8 .24 30 17 10 .46 27 12 .87 11 10 .30 31 --- --- --- 25 10 .68 --- --- TOTAL 1250 1693.41 8331 63229.05 488 10.41 238 RIO GRANDE DE LOIZA BASIN 50056400 RIO VALENCIANO NEAR JUNCOS, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) JULY AUGUST SEPTEMBER 1 13 20 .70 18 15 .73 18 12 .58 2 16 15 .65 22 15 .89 17 10 .46 3 12 12 .39 18 16 .78 17 10 .46 4 11 12 .36 16 15 .65 14 10 .38 5 12 12 .39 15 14 .57 17 15 .69 6 11 17 .50 19 14 .72 13 9 .32 7 10 20 .54 27 25 1.8 12 9 .29 8 12 20 .65 20 11 .59 77 49 9 14 20 .76 20 15 .81 43 100 12 10 11 15 .45 16 11 .48 18 25 1.2 11 13 15 .53 15 11 .45 22 18 1.1 12 16 15 .65 15 10 .41 631 526 3550 13 12 15 .49 31 25 2.1 554 522 1580 14 11 17 .50 20 18 .97 98 90 24 15 49 83 29 17 16 .73 58 50 7.8 16 63 58 13 16 15 .65 40 35 3.8 17 93 96 69 15 13 .53 30 25 2.0 18 29 25 2.0 15 12 .49 25 15 1.0 19 21 14 .79 17 15 .69 20 12 .65 20 148 199 186 14 8 .30 21 12 .68 21 38 20 2.1 17 7 .32 20 12 .65 22 24 15 .97 16 4 .17 20 12 .65 23 21 11 .62 14 2 .08 24 20 1.3 24 33 25 2.2 13 3 .11 31 20 1.7 25 20 18 .97 16 4 .17 145 182 160 26 30 20 1.6 14 5 .19 42 30 3.4 27 19 10 .51 159 209 232 31 20 1.7 28 28 11 .83 54 105 15 46 35 4.3 29 21 12 .68 18 15 .73 52 40 5.6 30 19 12 .62 20 15 .81 37 25 2.5 31 16 15 .65 15 12 .49 --- --- --- TOTAL 846 319.10 722 265.41 2202 5418.21 YEAR 24682.2 79985.66 239 RIO GRANDE DE LOIZA BASIN 50056400 RIO VALENCIANO NEAR JUNCOS, 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 DAY DISCHARGE (CFS) TRATION (MG/I) DISCHARGE (TONS/DAY) DISCHARGE (CFS) TRATION (MGM DISCHARGE (TONS/DAY) DISCHARGE (CFS) TRATION (MGM DISCHARGE (TONS/DAY) OCTOBER NOVEMBER DECEMBER 1 46 40 6.1 90 84 22 29 20 1.6 2 3 4 79 79 77 75 80 94 21 27 47 79 63 58 65 60 50 14 10 7.8 31 29 27 20 20 20 1.7 1.6 1.5 5 180 210 158 64 55 11 41 20 2.2 6 2920 1600 16500 55 45 6.7 38 25 2.6 7 1420 739 4060 50 40 5.4 30 20 1.6 8 428 363 930 45 38 4.6 26 20 1.4 9 136 120 45 42 35 4.0 25 18 1.2 10 95 90 23 40 30 3.2 26 12 .84 11 76 75 15 44 34 4.0 25 14 .95 12 66 60 11 56 45 7.8 34 20 1.8 13 59 45 7.2 51 45 6.2 25 16 1.1 14 53 30 4.3 51 40 5.5 23 14 .87 15 50 20 2.7 385 774 1690 24 15 .97 16 51 40 5.5 130 120 42 23 14 .87 17 72 65 16 74 65 14 22 14 .83 18 201 222 305 200 189 171 24 12 .78 19 80 64 16 63 60 10 23 14 .87 20 56 40 6.0 54 45 6.6 26 15 1.1 21 55 40 5.9 50 40 5.4 22 12 .71 22 47 40 5.1 41 38 4.2 22 12 .71 23 453 343 918 40 35 3.8 22 12 .71 24 1050 737 5200 37 25 2.5 25 13 .88 25 208 211 200 34 20 1.8 21 10 .57 26 150 146 85 31 20 1.7 23 11 .68 27 104 90 25 31 20 1.7 21 10 .57 28 77 60 12 30 20 1.6 21 10 .57 29 478 382 1330 30 20 1.6 19 18 .92 30 112 110 40 30 20 1.6 18 10 .49 31 160 154 70 --- --- --- 19 10 .51 TOTAL 9118 30096.8 2048 2071.7 784 33.70 240 RIO GRANDE DE LOIZA BASIN 50056400 RIO VALENCIANO NEAR JUNCOS, 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 24 10 .65 13 8 .28 8.8 5 .12 2 27 12 .87 13 8 .28 9.0 5 .12 3 22 12 .71 12 8 .26 9.1 5 .12 4 22 11 .65 15 10 .41 9.3 5 .13 5 20 10 .54 15 10 .41 11 6 .18 6 18 10 .49 12 8 .26 11 6 .18 7 18 10 .49 11 8 .24 9.0 5 .12 8 17 10 .46 11 8 .24 8.6 5 .12 9 35 20 1.9 11 8 .24 9.0 5 .12 10 27 12 .87 11 8 .24 8.8 5 .12 11 20 10 .54 12 8 .26 9.4 5 .13 12 18 10 .49 12 8 .26 8.8 5 .12 13 17 9 .41 11 7 .21 11 6 .18 14 16 8 .35 10 6 .16 13 6 .21 15 16 8 .35 10 6 .16 38 32 5.4 16 17 8 .37 10 6 .16 13 7 .25 17 61 67 33 12 11 .36 11 6 .18 18 24 12 .78 16 9 .39 8.2 5 .11 19 19 10 .51 12 8 .26 8.2 5 .12 20 17 10 .46 12 7 .23 8.2 5 .11 21 18 10 .49 11 7 .21 8.3 5 .11 22 16 10 .43 11 7 .21 8.8 5 .12 23 15 10 .41 9.9 6 .16 8.5 5 .11 24 17 10 .46 9.7 6 .16 7.4 5 .10 25 16 10 .43 11 6 .18 8.3 5 .11 26 16 10 .43 11 7 .21 17 14 1.1 27 14 10 .38 9.6 6 .16 8.8 5 .12 28 14 9 .34 9.0 6 .15 9.8 5 .13 29 13 8 .28 --- --- --- 93 111 77 30 14 8 .30 18 11 .53 31 13 8 .28 35 30 4.6 TOTAL 621 49.12 323.2 6.75 445.3 92.17 APRIL MAY JUNE 1 64 69 29 22 14 .83 42 40 4.5 2 17 10 .46 16 10 .43 57 22 1.2 3 13 8 .28 14 8 .30 53 30 4.3 4 29 28 7.5 16 10 .43 35 25 2.4 5 28 20 2.3 12 8 .26 32 18 1.6 6 23 14 .87 20 12 .65 27 15 1.1 7 14 8 .30 88 90 41 54 47 25 8 23 23 8.8 69 145 93 107 153 155 9 46 40 12 49 39 6.0 141 143 129 10 14 8 .30 308 328 758 204 181 341 11 11 7 .21 215 184 168 51 40 5.5 12 11 7 .21 53 42 6.0 42 30 3.4 13 10 6 .16 851 1020 25100 79 68 26 14 9.5 5 .13 831 472 2120 68 57 12 15 9.3 5 .13 89 75 18 46 30 3.7 16 9.5 5 .13 61 58 9.6 54 46 8.3 17 9.1 5 .12 54 42 6.1 34 22 2.0 18 9.0 5 .12 417 303 1330 33 25 2.2 19 8.6 5 .12 127 140 89 49 49 9.0 20 8.4 5 .11 69 70 13 31 15 1.3 21 8.3 5 .11 66 60 11 28 14 1.1 22 7.8 5 .11 63 82 18 26 14 .98 23 7.4 5 .10 42 30 3.4 25 14 .95 24 7.9 5 .11 36 22 2.1 24 13 .84 25 7.1 5 .11 32 21 1.8 22 13 .77 26 7.1 5 .10 29 18 1.4 23 12 .75 27 10 16 1.3 29 18 1.4 26 12 .84 28 21 13 .74 26 22 2.1 23 12 .75 29 365 471 2320 25 20 1.4 21 12 .68 30 60 51 11 23 12 .75 21 12 .68 31 --- --- --- 114 134 113 --- --- --- TOTAL 868.0 2396.93 3866 29916.95 1478 746.84 241 RIO GRANDE DE LOIZA BASIN 50056400 RIO VALENCIANO NEAR JUNCOS, 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 25 12 .81 20 12 .65 22 13 .77 2 21 12 .68 18 10 .49 19 12 .62 3 22 12 .71 13 5 .18 16 10 .43 4 20 12 .65 14 5 .19 15 8 .32 5 19 10 .51 12 5 .16 15 8 .32 6 40 31 4.9 12 5 .16 16 10 .43 7 30 15 1.2 18 10 .41 15 8 .32 8 20 12 .65 42 35 8.0 13 8 .28 9 19 12 .62 19 17 .87 12 8 .26 10 17 8 .37 20 20 1.1 12 8 .26 11 19 8 .41 33 22 2.0 11 8 .24 12 20 8 .43 17 22 1.0 11 7 .21 13 17 8 .37 50 65 48 12 7 .21 14 24 8 .52 49 47 16 18 12 .58 15 24 8 .52 25 12 .39 12 7 .23 16 19 8 .41 18 12 .58 11 7 .21 17 18 8 .39 16 10 .43 11 7 .21 18 18 8 .39 14 12 .45 9.5 7 .18 19 16 8 .35 14 8 .30 9.7 7 .18 20 16 7 .30 13 9 .32 9.5 7 .18 21 16 7 .30 12 10 .32 9.0 7 .17 22 15 7 .30 11 10 .30 11 6 .18 23 20 8 .43 11 10 .30 12 6 .19 24 18 8 .39 11 9 .27 33 18 1.6 25 15 5 .20 11 8 .24 26 16 1.1 26 14 5 .19 9.8 8 .21 16 9 .39 27 16 5 .22 9.5 8 .21 13 8 .28 28 17 6 .28 27 28 8.5 15 7 .28 29 14 5 .19 386 313 976 12 6 .19 30 23 12 .75 29 20 1.6 11 8 .24 31 24 12 .78 20 12 .65 --- --- --- TOTAL 616 19.22 974.3 1070.28 427.7 11.06 YEAR 21569.5 66511.52 242 RIO GRANDE DE LOIZA BASIN 50056900 QUEBRADA MAMEY NEAR GURABO, PR LOCATION.--Lat 18°14'57", long 65°56 1 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 min (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.--Records fair except those for estimated daily discharges, which are poor. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 2,740 ft'/s (77.6 10/s), Nov. 26, 1987, gage height, 11.04 ft (3.365 a), from rating curve extended above 400 ft'/s (11.3 m'/s) on basis of indirect measurement of peak flow and step-backwater analysis; minimum discharge, 0.20 ft'is (0.006 m'/s), Feb. 10, 1987. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 500 ft'/s (14.2 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (e/s) (ft) (a) Date Time (ft'/s) (m'/s) (ft) (a) Nov.26 2400 *2,740 77.6 *11.04 3.365 Aug. 24 1430 1,311 37.9 8.76 2.670 Dec. 7 1800 2,190 62.0 10.25 3.124 Sept.11 1100 904 25.6 6.04 1.841 Minimum discharge, 0.26 ft'/s (0.007 110/s), June 8. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 .35 .99 4.2 e3.2 1.6 .68 .59 .39 .36 28 .73 1.9 2 .32 .62 6.4 e3.0 1.7 .65 .58 .38 .32 27 .69 1.8 3 .50 .56 3.8 e2.1 2.1 .63 .54 .37 .30 3.4 .75 1.8 4 .44 1.2 3.6 e2.1 1.8 .64 .50 .35 .29 2.3 .97 1.8 5 .45 .78 3.6 e2.0 1.5 .64 .47 .35 .29 2.0 .71 1.8 6 .39 .80 5.6 e2.0 1.4 .61 .91 .66 .31 6.8 .65 1.8 7 .44 .72 219 el.9 1.3 .61 .78 .48 .27 13 .68 1.8 8 .45 .61 102 el.9 1.4 .61 .49 .38 .27 2.5 .76 el.8 9 .43 .56 5.1 el.8 1.3 .59 .44 .36 .27 1.9 .76 e5.0 10 .40 .55 e3.2 el.8 1.2 .58 .42 .67 .29 1.7 19 e2.0 11 .38 .54 e3.0 el.7 1.2 .58 .53 .53 .31 1.8 4.9 126 12 .37 .53 e2.8 el.8 1.4 .59 .42 .41 .33 3.0 2.4 e24 13 .36 .52 e2.6 1.8 1.2 .60 .40 .38 .31 5.5 1.7 e3.3 14 .52 .52 e2.4 1.8 1.2 .59 .39 .39 .35 5.0 1.5 e5.0 15 .65 .52 e2.1 1.7 1.4 .55 .48 .38 5.1 1.7 1.4 e3.5 16 .65 1.4 e2.0 1.6 1.3 .56 .43 .37 .98 3.5 1.5 e3.0 17 3.7 1.8 e2.0 1.7 1.2 .56 .40 .38 .61 2.2 1.8 e2.7 18 31 1.2 e3.0 1.7 1.2 .58 .40 .35 .47 1.9 1.7 e2.5 19 3.7 .73 e3.0 1.6 1.1 .59 .40 .42 .41 2.0 1.5 e13 20 .99 .62 e2.9 1.6 1.1 .64 .38 .41 .47 1.2 1.4 e3.0 21 .72 .59 e2.8 1.5 1.1 .61 .38 .36 .53 1.0 1.4 e2.5 22 .63 .58 e2.0 1.5 1.0 .57 .37 .36 .62 4.4 2.1 e2.2 23 .60 3.0 e2.0 1.4 .96 .55 .95 .34 .50 1.5 7.2 e2.0 24 .58 155 e2.0 1.5 1.0 .55 .59 .31 4.5 2.3 e192 el.8 25 .62 10 e2.0 1.7 .97 .57 .46 .31 2.2 2.2 e76 el.8 26 .59 94 el.9 1.6 .90 .62 .39 .31 2.4 1.3 e3.9 el.7 27 .58 343 e1.9 1.6 3.0 .66 .38 .30 1.3 1.0 2.6 el.7 28 .99 14 e1.9 1.7 .87 .65 .37 .30 .75 .83 2.4 el.6 29 .71 6.1 el.8 1.7 .73 .75 .36 .45 .70 .88 2.3 el.6 30 .57 5.0 e2.1 1.7 --- .67 .37 .44 .72 1.0 2.1 el.6 31 1.8 --- e3.2 1.6 .61 --- .43 --- .78 2.0 --- TOTAL 54.88 647.04 405.9 56.3 38.13 18.89 14.57 12.32 26.53 133.59 339.50 226.0 MEAN 1.77 21.6 13.1 1.82 1.31 .61 .49 .40 .88 4.31 11.0 7.53 MAX 31 343 219 3.2 3.0 .75 .95 .67 5.1 28 192 126 MIN .32 .52 1.8 1.4 .73 .55 .36 .30 .27 .78 .65 1.6 AC-FT 109 1280 805 112 76 37 29 24 53 265 673 448 CFSM .77 9.38 5.69 .79 .57 .26 .21 .17 .38 1.87 4.76 3.28 IN. .89 10.47 6.56 .91 .62 .31 .24 .20 .43 2.16 5.49 3.66 CAL YR 1987 TOTAL 1764.14 MEAN 4.83 MAX 343 MIN .21 AC-FT 3500 CFSM 2.10 IN. 28.53 WTR YR 1988 TOTAL 1973.65 MEAN 5.39 MAX 343 NIN .27 AC-FT 3910 CFSM 2.34 IN. 31.92 e Estimated 243 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 1987 TO SEPTEMBER 1988 STREAMFIOW. SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- ,DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANT4NEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) OCT, 15 1410 0.55 586 27.5 APR, 06 1239 0.43 594 28.0 NOV, 18 1318 0.95 455 27.0 MAY. 09 1502 0.37 576 27.0 JAN, 08 1422 1.91 600 26.5 JUN. 06 0913 0.34 610 26.5 FEB, 05 1226 1.55 612 26.0 JUL, 14 1347 3.50 311 26.5 MAR. 03 1543 0.63 578 26.0 244 RIO GRANDE DE LOIZA BASIN 50056900 QUEBRADA MAMEY NEAR GURABO, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORD.-- Water years 1984 to 1986 PERIOD OF DAILY RECORD.-- SUSPENDED-SEDIMENT DISCHARGE: January 1983 to September 1986. REMARKS.-- The suspended-sediment data included in this report is part of a 5-year hydrologic investigation conducted in the Rio Grande de Loiza Basin to account the amount of suspended- sediment transported to Lago Loiza, a water supply reservoir. EXTREMES FOR PERIOD OF DAILY RECORD.-- SEDIMENT CONCENTRATION: Maximum daily mean, 643 mg/L October 06, 1985; Minimum daily mean, 2 mg/L several days. SEDIMENT LOADS: Maximum daily mean, 1,060 tons (960 tonnes) May 18, 1985; Minimum daily mean, 0.00 tons (0.00) tonne several days. EXTREMES FOR WATER YEARS 1984-86.-- Water suspeneded-sediment concentration (mg/L) suspended-sediment discharge (tons per day) Year maximum minimum maximum minimum 1984 328 (Aug. 30) 1 (several days) 224 (Jun. 10) 0.01 (several days) 1985 587 (May 17) 2 (March 12) 1,060 (May 18) 0.01 (several days) 1986 643 (Oct. 06) 2 (September 30) 684 (Oct. 06) 0.00 (several days) SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 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 .56 24 .04 .44 22 .03 .53 21 .03 2 .52 24 .03 .45 22 .03 .52 20 .03 3 .51 23 .03 .44 22 .03 .49 20 .03 4 .51 23 .03 .47 23 .03 .49 18 .02 5 .51 23 .03 .44 23 .03 .54 15 .02 6 .50 22 .03 .50 22 .03 .54 12 .02 7 .48 22 .03 .56 24 .04 .51 6 .80 8 .58 23 .04 .52 24 .03 .51 4 .50 9 .60 25 .04 5.8 108 4.6 .54 4 .01 10 .63 25 .04 6.9 132 6.8 .49 4 .01 11 .56 23 .03 2.3 50 .31 .49 4 .01 12 .67 25 .05 1.2 40 .13 .50 4 .01 13 1.1 35 .10 9.5 104 10 .50 4 .01 14 .76 28 .06 1.8 50 .24 .49 4 .01 15 .55 25 .04 28 161 38 .51 4 .01 16 .54 24 .03 44 253 84 .56 4 .01 17 .55 24 .04 1.6 40 .17 .55 4 .01 18 .52 23 .03 .97 33 .09 .51 4 .01 19 .75 28 .06 .81 30 .07 .53 4 .10 20 .91 28 .07 .73 28 .06 .51 4 .01 21 .54 24 .03 .65 26 .05 .49 4 .01 22 .50 23 .03 .63 26 .J4 .49 4 .01 23 .51 22 .03 .62 25 .04 .55 4 .01 24 .50 22 .03 .58 25 .04 .53 4 .01 25 .51 22 .03 .57 25 .04 .50 4 .01 26 .50 22 .03 .56 25 .04 .51 4 .01 27 .46 22 .03 .60 25 .04 ,1 4 .01 28 .45 22 .03 .59 23 .04 .52 4 .01 29 .44 22 .03 .53 22 .03 .51 4 .01 30 .44 22 .03 --- --- --- .51 4 .01 31 .43 22 .03 .53 4 .01 TOTAL 17.59 1.18 112.76 145.08 15.99 1.77 245 RIO GRANDE DE LOIZA BASIN 50056900 QUEBRADA MAMEY NEAR GURABO, PR--Continued SEDIMENT DISCHARGE. SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 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 .54 4 .01 .53 21 .03 .95 27 .07 2 .55 3 .90 .53 19 .03 .73 22 .04 3 .56 3 .50 .53 18 .03 .52 15 .02 4 .57 3 .20 .51 16 .02 .52 10 .01 5 .57 3 .20 .50 14 .02 .54 6 .01 6 .62 3 .01 .49 13 .02 2.9 55 .96 7 .66 3 .01 .48 11 .01 4.3 63 1.6 8 .62 3 .01 .47 10 .01 2.1 53 .36 9 .64 3 .01 .47 9 .01 .84 33 .07 10 .66 3 .01 .45 8 .01 73 248 224 11 .67 3 .01 .43 8 .01 2.0 50 .27 12 .67 2 .80 .47 8 .01 .98 28 .07 13 .63 2 .70 .92 21 .09 .83 25 .06 14 .55 2 .60 1.0 15 .04 .69 25 .05 15 .53 2 .50 .66 12 .02 .59 24 .04 16 .49 2 .10 .59 10 .02 .55 22 .03 17 .50 2 .00 .54 9 .01 .60 22 .04 18 .51 2 .00 .52 8 .01 .56 20 .03 19 .52 2 .00 .51 8 .01 .56 20 .03 20 .48 2 .00 .50 8 .01 .58 19 .03 21 .46 2 .00 .51 8 .01 .56 18 .03 22 .47 2 .00 .48 8 .01 .56 16 .02 23 .47 2 .00 .55 8 .01 .52 15 .02 24 .46 .90 .48 8 .01 .50 14 .02 25 .44 .49 8 .01 .49 13 .02 26 .48 1 .90 .52 8 .01 .47 12 .02 27 1.1 19 .11 .58 12 .02 .46 11 .01 28 1.1 27 .09 .68 12 .02 .46 11 .01 29 .58 23 .04 .60 10 .02 .61 10 .02 30 .50 22 .03 5.8 81 1.9 .61 10 .02 31 --- --- --- 3.7 61 .81 --- --- --- TOTAL 17.60 6.64 25.49 3.25 99.58 227.98 JULY AUGUST SEPTEMBER 1 .48 9 .01 .60 25 .04 1.3 35 .12 2 .45 9 .01 1.7 32 .15 .80 30 .06 3 .46 9 .01 .64 25 .04 9.8 100 13 4 .47 9 .01 .58 20 .03 2.6 70 ,65 5 2.2 49 .34 .59 18 .03 14 113 18 6 .70 27 .05 .50 17 .02 3.6 73 1.0 7 .47 17 .02 .48 15 .02 1.0 35 .09 8 .44 15 .02 .47 14 .02 .73 25 ,05 9 .75 20 .04 .46 14 .02 .78 30 .06 10 1.3 37 .13 .42 13 .01 .81 30 .07 11 .76 33 .07 .38 12 .01 .63 25 .04 12 .55 32 .05 .38 12 .01 .70 25 .05 13 .48 32 .04 .39 12 .01 .75 28 .06 14 .70 32 .06 .38 11 .01 2.3 58 .72 15 .99 30 .08 .38 10 .01 .97 35 .09 16 .54 24 .03 .54 9 .01 27 129 49 17 .48 22 .03 .48 9 .01 39 250 49 18 .48 20 .03 .39 10 .01 30 227 31 19 .47 19 .02 .42 10 .01 11 125 5.4 20 .63 18 .03 .45 10 .01 29 202 32 21 .56 16 .02 .43 10 .01 5.7 70 1.1 22 .59 15 .02 .44 9 .01 2.8 58 .44 23 .51 14 .02 .41 8 .01 2,1 44 .25 24 .47 12 .02 .38 7 .01 1.8 40 .19 25 .43 11 .01 .38 7 ,01 1.7 30 .14 26 .42 9 .01 12 87 12 1.5 20 .08 27 .45 8 .01 3.8 101 2.2 1.4 20 .08 28 .43 7 .01 .42 50 .06 1.4 18 .07 29 3.4 44 2.2 .28 52 .04 1.3 17 .06 30 1.3 37 .13 79 328 202 1.3 15 .05 31 .65 27 .05 4.1 70 .77 --- --- --- TOTAL 23.01 3.58 112.27 211.60 197.77 202.92 YEAR 623.83 810.08 246 RIO GRANDE DE LOIZA BASIN 50056900 QUEBRADA MAMEY NEAR GURABO, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) OCTOBER NOVEMBER DECEMBER 1 1.3 37 .13 3.0 60 .49 1.5 5 .02 2 1.3 37 .13 48 4.8 58 1.7 3 1.5 40 .16 116 379 226 2.1 35 .20 4 1.4 40 .15 60 274 76 1.7 12 .06 5 14 118 16 111 467 280 1.6 7 .03 6 3.0 68 .80 140 499 297 1.6 4 .02 7 1.5 40 .16 54 259 87 1.5 4 .02 8 1.3 37 .13 10 113 4.1 1.5 4 .02 9 16 129 19 9.4 130 4.5 1.6 4 .02 10 6.9 92 2.2 18 153 20 1.6 4 .02 11 2.3 52 .32 4.1 65 .72 4.7 48 3.8 12 1.7 45 .21 2.9 60 .47 3.8 66 1.0 13 3.4 65 1.8 2.5 58 .39 1.5 30 .12 14 43 202 89 4.2 85 .96 1.4 20 .08 15 3.7 65 .65 4.0 65 .70 1.3 17 .06 16 2.9 65 .51 2.3 33 .20 1.7 16 .07 17 11 106 13 2.5 20 .14 1.4 16 .06 18 4.3 83 1.3 2.2 15 .09 1 1 16 .06 19 2.0 45 .24 2.0 12 .06 I., 15 .05 20 1.7 43 .20 1.9 9 .05 1.3 15 .05 21 13 130 18 1.9 9 .05 1.3 15 .05 22 3.0 60 .49 1.9 9 .05 1.2 14 .05 23 1.9 45 .23 2.0 7 .04 1.3 13 .05 24 1.6 42 .18 1.9 7 .04 1.7 12 .06 25 14 141 21 1.9 7 .04 1.6 12 .05 26 2.5 50 .34 2.1 6 .03 1.4 11 .04 27 2.0 45 .24 1.8 6 .03 1.6 10 .04 28 12 131 7.4 1.8 6 .03 1.4 9 .03 29 3.9 90 1.0 1.7 5 .02 1.3 8 .03 30 44 213 86 1.5 5 .02 2.5 38 .48 31 4.4 80 1.2 --- --- --- 1.8 45 .22 TOTAL 226.5 282.17 616.5 999.22 56.3 8.56 RIO GRANDE GE lUIZA BASIN 247 50056900 QUEBRADA MAMEY NEAR GURABO. PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 DAY MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE (CFS) (MG/1) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) JANUARY FEBRUARY MARCH 1 2 3 4 5 2.1 9.9 1.6 1.4 1.3 46 120 35 25 24 .40 7.6 .15 .09 .08 .76 .73 .69 .66 .62 10 10 10 10 10 .02 .02 .02 .02 .02 1.3 .86 .81 .84 .88 38 32 29 27 24 .13 .07 .06 .06 .06 6 7 8 9 10 1.5 1.6 1.3 1.2 1.1 23 21 20 19 18 .09 .09 .01 .06 .05 .61 .60 .59 .58 .57 8 8 8 8 7 .01 .01 .01 .01 .01 1.0 1.1 1.1 .88 .87 20 16 13 9 6 .05 .05 .04 .02 .01 11 12 13 14 15 1.1 1.0 .96 .95 .93 17 16 16 16 15 .05 .04 .04 .04 .04 .56 .55 .53 .53 .59 7 7 7 7 7 .01 .01 .01 .01 .01 .86 .87 .86 .87 .87 3 2 3 3 4 .01 .00 .01 .01 .01 16 17 18 19 20 .89 .89 .86 .82 .79 15 15 14 13 12 .04 .04 .03 .03 .03 .61 .62 .74 .72 .74 8 8 7 8 8 .01 .01 .J1 .02 .02 .91 .95 1.1 .92 .81 5 5 6 7 8 .01 .01 .02 .02 .02 21 22 23 24 25 .78 .77 .78 .73 .74 11 11 11 10 10 .02 .02 .02 .02 .02 .72 .73 .70 .74 .77 7 7 7 7 7 .01 .01 .01 .01 .01 .79 .78 .79 ./9 .75 9 10 10 10 10 .02 .02 .02 .02 .02 26 27 28 29 30 31 .86 .79 .80 .75 .74 .74 10 10 10 10 11 11 .02 .02 .02 .02 .02 .02 .78 1.0 7.0 --- 7 10 84 --- .01 .03 3.1 --- .77 .78 .98 82 1.8 1.9 10 10 13 327 50 35 .02 .02 .12 227 .24 .18 TOTAL 40.67 9.28 25.04 3.46 110.79 228.35 APRIL MAY JUNE 1 2 3 4 5 .95 .83 .86 .74 .72 32 27 20 23 20 .08 .06 .05 .05 .04 .36 .35 .35 .32 .32 17 16 15 14 14 .02 .02 .01 .01 .01 .81 .80 .80 .78 .77 11 11 12 12 12 .02 .02 .03 .03 .02 6 7 8 9 10 .73 .70 .68 .66 .61 19 18 17 16 15 .04 .03 .03 .03 .02 .32 .30 .29 .28 .28 13 12 11 10 10 .01 .01 .01 .01 .01 .76 .73 .75 .73 .70 12 12 12 11 11 .02 .02 .02 .02 .02 11 12 13 14 15 .58 .57 .60 .56 .61 13 11 9 6 4 .02 .02 .01 .01 .01 .29 .36 .35 5.6 163 10 10 10 59 418 .01 .01 .01 .79 440 .68 .67 .64 .61 .60 11 10 10 11 11 .02 .02 .02 .02 .02 16 17 18 19 20 .82 .62 .55 .49 .48 4 4 5 6 8 .01 .01 .01 .01 .01 11 164 239 9.9 3.3 110 587 546 80 20 21 1060 796 2.1 .18 .63 .63 .63 .64 .62 11 11 11 10 10 .02 .02 .02 .02 .02 21 22 23 24 25 .46 .43 35 4.6 1.5 10 12 160 109 45 .01 .01 54 1.9 .18 2.1 1.6 1.4 1.2 1.1 14 14 13 12 11 .08 .06 .05 .04 .03 .68 .66 .63 .64 .65 10 11 12 12 10 .02 .02 .02 .02 .02 26 27 28 29 30 31 .66 .51 .43 .41 .39 --- 25 20 20 19 18 --- .04 .03 .02 .02 .02 --- 1.0 .99 .94 .89 .86 .83 11 12 12 10 10 10 .03 .03 .03 .02 .02 .02 .70 .66 .62 .60 .60 --- 11 11 11 11 11 .02 .02 .02 .02 .02 --- TOTAL 57.75 56.78 612.88 2320.63 20.42 0.62 248 RIO GRANDE DE LOIZA BASIN 50056900 QUEBRADA MAMEY NEAR GURABO, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) JULY AUGUST SEPTEMBER 1 .68 10 .02 .74 29 .06 .59 6 .01 2 .67 10 .02 .73 10 .02 .61 6 .01 3 .67 10 .02 .68 8 .01 .55 6 .01 4 .67 10 .02 .66 7 .01 .47 6 .01 5 .61 10 .02 .76 8 .02 .51 6 .01 6 .56 10 .02 .59 6 .01 .63 6 .01 7 .57 9 .01 .48 7 .01 s1 6 .01 8 .56 9 .01 .43 6 .01 2.i 42 .50 9 .55 8 .01 .40 6 .01 1.7 20 .09 10 .49 7 .01 .40 6 .01 .65 8 .01 11 .47 7 .01 .38 6 .01 .58 8 .01 12 .47 7 .01 .42 7 .01 17 85 22 13 .46 7 .01 .84 15 .03 34 252 50 14 .47 7 .01 .52 11 .02 3.1 60 .66 15 4.6 64 .59 .47 9 .01 1.7 45 .21 16 1.2 62 .76 .43 6 .01 1.2 37 .12 17 .88 32 .08 .39 6 .01 .90 32 .08 18 .80 30 .06 .44 7 .01 .75 29 .06 19 .90 32 .08 .44 8 .01 .60 26 .04 20 4.4 74 .88 .38 8 .01 .63 27 .05 21 1.1 36 .11 .85 15 .03 .60 26 .04 22 .80 30 .06 .51 10 .01 .60 26 .04 23 .82 30 .07 .43 10 .01 .72 28 .05 24 .81 30 .07 .40 9 .01 2.0 44 .26 25 .82 30 .07 .38 8 .01 27 189 30 26 .81 30 .07 .47 10 .01 1.8 40 .19 27 .73 30 .06 6.5 93 2.1 2.0 48 .44 28 .81 28 .06 1.1 25 .07 4.4 84 1.8 29 .84 31 .07 .68 12 .02 1.8 40 .19 30 .80 30 .06 .54 7 .01 1.1 35 .10 31 .77 29 .06 .51 6 .01 --- --- --- TOTAL 29.79 3.41 22.95 2.59 110.80 107.01 YEAR 1930.39 4022.08 249 RIO GRANDE DE LOIZA BASIN 50056900 QUEBRADA MAMEY NEAR GURABO, 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 2.8 54 .64 4.3 68 .79 2.3 7 .04 2 9.8 109 4.5 3.4 62 .57 2.2 8 .05 3 2.3 45 .28 3.1 59 .49 2.0 6 .03 4 17 95 36 3.0 58 .47 2.0 7 .04 5 17 184 20 3.0 57 .46 2.2 7 .04 6 251 643 684 2.8 52 .39 2.2 7 .04 7 189 542 549 2.7 50 .36 2.3 7 .04 8 54 399 171 2.5 50 .34 2.3 6 .04 9 8.6 100 2.3 2.6 50 .35 2.5 6 .04 10 5.2 80 1.1 2.5 50 .34 2.5 5 .03 11 4.1 65 .72 2.6 50 .35 2.5 5 .03 12 3.6 62 .60 3.2 55 .48 2.4 4 .03 13 3.4 62 .57 4.6 80 .99 2.2 5 .03 14 3.2 60 .52 3.4 20 .18 2.1 5 .03 15 3.2 60 .52 87 359 253 2.2 5 .03 16 3.2 60 .52 12 125 4.1 1.9 5 .03 17 3.1 60 .50 7.6 100 2.1 2.0 5 .03 18 14 132 12 31 228 58 1.9 5 .03 19 5.2 85 1.2 5.2 80 1.1 1.9 5 .03 20 3.4 70 .64 4.7 80 1.0 1.8 5 .02 21 3.2 65 .56 34 185 87 1.8 5 .02 22 3.1 60 .50 4.5 20 .24 1.7 5 .02 23 35 217 56 3.8 12 .12 1.6 5 .02 24 34 218 26 3.4 12 .11 1.6 5 .02 25 10 85 2.3 3.0 11 .09 1.7 5 .02 26 6.2 88 1.8 2.8 10 .08 1.6 4 .02 27 5.1 85 1.2 2.6 8 .06 1.4 4 .02 28 3.6 65 .63 2.5 7 .05 1.4 3 .01 29 21 172 19 2.4 7 .05 1.4 4 .02 30 6.3 90 1.8 2.4 7 .05 1.4 4 .02 31 25 170 43 --- --- --- 1.3 5 .02 TOTAL 755.6 1639.40 252.6 413.71 60.3 0.89 250 RIO GRANDE DE IOIZA BASIN 50056900 QUEBRADA MAMEY NEAR GURABO, 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 1.4 5 .02 1.1 7 .02 .88 6 .01 2 1.6 5 .02 1.1 7 .02 .85 6 .01 3 1.4 5 .02 1.1 8 .02 .77 6 .01 4 1.5 5 .02 5.9 61 3.6 .79 6 .01 5 1.5 5 .02 1.9 45 .23 .80 6 .01 6 1.5 4 .02 1.2 25 .08 ....0 6 .01 7 1.5 4 .02 1.1 14 .04 .79 6 .01 8 1.5 5 .02 1.1 10 .03 .75 6 .01 9 2.0 5 .03 1.1 9 .03 .72 6 .01 10 1.8 5 .02 1.1 8 .02 .72 6 .01 11 1.6 5 .02 1.1 7 .02 .76 6 .01 12 1.5 5 .02 1.1 6 .02 .74 6 .01 13 1.5 5 .02 1.0 6 .02 .74 7 .01 14 1.4 5 .02 1.0 6 .02 .82 12 .03 15 1.3 5 .02 1.0 6 .02 1.8 49 .25 16 1.4 5 .02 1.0 6 .02 .81 22 .05 17 1.4 5 .02 1.0 6 .02 .75 17 .03 18 1.3 5 .02 1.0 6 .02 .73 17 .03 19 1.3 5 .02 1.0 6 .02 .73 16 .03 20 1.2 5 .02 .99 6 .02 .73 15 .03 21 1.2 5 .02 .95 6 .02 .72 15 .03 22 1.3 5 .02 .94 6 .02 .70 14 .03 23 1.4 5 .02 .90 6 .01 .69 13 .02 24 1.4 5 .02 .88 6 .01 .72 13 .03 25 1.4 5 .02 .85 6 .01 .74 13 .03 26 1.3 5 .02 .83 6 .01 .75 13 .03 27 1.3 5 .02 .82 6 .01 .73 12 .02 28 1.3 5 .02 .91 6 .01 .69 11 .02 29 1.3 5 .02 --- --- 1.3 32 .17 30 1.2 5 .02 .80 30 .06 31 1.2 6 .02 1.0 23 .07 TOTAL 43.9 0.63 33.97 4.39 25.32 1.09 APRIL MAY JUNE 1 1.1 1 .02 2.2 6 .04 .96 35 .09 2 .73 7 .01 1.7 5 .02 2.8 49 .77 3 .71 7 .01 1.5 5 .02 1.2 30 .10 4 1.0 20 .05 1.4 5 .02 .92 30 .07 5 2.1 40 .39 1.4 5 .02 3.5 101 3.8 6 1.4 25 .09 1.4 5 .02 .99 29 .08 7 .83 10 .02 2.8 52 .48 .91 --- --- 8 27 158 72 17 119 19 .87 25 .06 9 3.5 20 .19 41 226 122 4.3 70 1.9 10 1.2 7 .02 21 159 20 1.3 30 .11 11 1.1 6 .02 18 173 14 .96 28 .07 12 .89 6 .01 2.9 60 .47 .91 25 .06 13 .84 6 .01 173 475 667 1.3 35 .12 14 .80 6 .01 87 219 274 1.5 40 .16 15 .84 6 .01 2.4 25 .16 .93 15 .04 16 .89 5 .01 1.4 20 .08 .95 15 .04 17 .82 5 .01 1.1 18 .05 .87 14 .03 18 .76 5 .01 2.8 64 1.5 .84 14 .03 19 .73 5 .01 5.4 80 4.7 .81 14 .03 20 7.4 45 5.3 1.3 20 .07 .80 13 .03 21 1.6 18 .08 1.0 18 .05 .79 13 .03 22 .86 10 .02 .99 15 .04 .78 13 .03 23 .73 10 .02 .92 15 .04 .79 13 .03 24 .69 10 .02 .88 15 .04 .78 13 .03 25 .66 10 .02 .83 15 .03 .76 12 .02 26 .62 10 .02 .84 15 .03 .74 12 .02 27 .69 14 .03 .83 15 .03 .83 13 .03 28 1.3 29 .17 .84 17 .04 .78 13 .03 29 40 175 115 .82 17 .04 .75 13 .03 30 4.7 17 .22 .79 19 .04 .76 14 .03 31 --- --- --- 3.1 56 .75 --- --- --- TOTAL 106.49 193.80 398.54 1124.78 35.38 7.87 251 RIO GRANDE DE LOIZA BASIN 50056900 QUEBRADA MAMEY NEAR GURABO. 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 .75 14 .03 .67 10 .02 1.6 40 .17 2 .75 15 .03 .64 10 .02 .91 15 .04 3 .72 15 .03 .64 10 .02 .79 10 .02 4 .69 15 .03 .64 10 .02 .69 10 .02 5 .70 15 .03 .59 10 .02 .68 10 .02 6 1.1 30 .09 .57 10 .02 .74 10 .02 7 .87 17 .04 .62 15 .03 .66 10 .02 8 .79 16 .03 1.1 25 .07 .62 10 .02 9 .78 15 .03 .75 12 .02 .62 10 .02 10 .76 15 .03 .77 10 .02 .60 10 .02 11 .79 15 .03 2.0 50 .57 .57 10 .02 12 .82 15 .03 .84 7 .02 .56 10 .02 13 .80 15 .03 .74 5 .01 .56 9 .01 14 .72 15 .03 .84 5 .01 .56 9 .01 15 .75 14 .03 1.1 15 .04 .59 8 .01 16 .77 13 .03 .91 10 .02 .55 8 .01 17 .69 12 .02 .75 10 .02 .53 9 .01 18 .64 12 .02 .75 10 .02 .51 9 .01 19 .61 12 .02 .73 10 .02 .50 9 .01 20 .59 12 .02 .70 10 .02 .49 9 .01 21 .59 12 .02 .70 10 .02 .49 10 .01 22 .60 12 .02 .72 10 .02 .52 10 .01 23 .62 12 .02 .72 10 .02 .55 10 .01 24 .59 11 .02 .72 10 .02 .74 10 .02 25 .58 11 .02 .71 10 .02 .68 10 .02 26 .57 11 .02 .68 10 .02 .63 10 .02 27 .57 11 .02 .69 10 .02 .57 8 .01 28 .59 11 .02 11 65 10 .54 6 .01 29 .59 10 .02 55 255 98 .51 3 .00 30 2.0 41 .79 1.6 40 .17 .49 2 .00 31 .92 12 .03 1.0 30 .08 --- --- --- TOTAL 23.31 1.63 89.89 109.40 19.05 0.60 YEAR 1844.35 3498.19 252 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 of Gurabo, and 4.5 mi (7.6 km) upstream from Rio Grande de Loiza. DRAINAGE AREA.--60.2 mi' (155.9 km 2 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--1958 (occasional low-flow measurements only), January to September 1959 (monthly measurements only), October 1959 to current year. GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 136.58 ft (41.63 m) above mean sea level. REMARKS.--Records fair except those for estimated daily discharges, which are poor. AVERAGE DISCHARGE.--29 years (1960-88), 138 ft'/s (3.908 ml/s), 31.13 in/yr (791 mm/yr), 99,980 acre-ft/yr (123 hm7yr); median of yearly mean discharges, 127 ft'/s (3.60 m'/s), 92,000 acre-ft/yr (110 hm'/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'/s (227 m'/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'/s (0.127 m'/s), Feb. 21,25, 1968. EXTREMES OUTSIDE PERIOD OF RECORD.--Approximate elevation to gage datum of the Aug. 4, 1945 flood, as pointed out by local residents, 26.6 ft (8.11 m). 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) (m'/s) (ft) (m) Date Time (fti/s) (m'/s) (ft) (m) Oct. 18 2100 9,670 274 15.37 4.685 July 7 0600 4,040 114 9.89 3.014 Nov. 24 2015 8,770 248 14.84 4.523 July 14 0345 3,270 92.6 8.79 2.679 Nov. 27 unknown 45,000 1,270 24.35 7.422 Aug. 24 1730 15,800 447 18.18 5.541 Dec. 6 0445 3,340 94.6 8.89 2.710 Sept.11 1415 10,900 309 16.02 4.883 Dec. 8 0100 *50,600 1,430 *25.09 7.647 Minimum discharge, 15 ft'is (0.425 m'/s), Apr. 22, 23, June 8, 9. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 50 59 143 394 139 37 23 21 32 570 52 60 2 33 45 455 192 113 50 22 20 23 793 47 55 3 33 40 119 138 147 36 21 17 20 172 44 51 4 57 123 95 116 89 32 20 16 19 87 57 49 5 41 100 79 124 66 32 20 16 18 62 46 46 6 32 235 641 127 69 30 27 218 18 119 41 40 7 35 104 9720 121 52 30 38 155 17 1280 68 42 8 30 60 11500 117 50 30 24 46 16 148 76 45 9 30 51 516 121 57 29 22 29 17 92 49 221 10 29 50 315 121 74 27 20 77 21 96 119 210 11 23 46 227 113 55 27 22 162 18 98 217 2870 12 22 58 186 120 51 27 21 53 53 102 109 930 13 22 63 164 104 89 27 19 32 29 69 58 320 14 256 41 150 107 72 28 18 31 40 780 48 353 15 161 39 143 98 54 26 32 59 585 108 47 232 16 173 44 139 91 62 26 27 41 244 71 45 161 17 667 73 131 89 50 26 20 32 164 66 96 102 18 2100 150 128 90 45 26 20 31 62 72 68 75 19 557 66 146 84 43 25 22 33 43 94 49 e597 20 153 70 179 82 42 26 17 46 272 68 42 e191 21 97 47 173 79 40 27 18 74 251 56 39 e121 22 72 44 212 75 39 26 15 45 162 129 70 120 23 62 181 139 74 37 24 46 29 112 84 131 155 24 70 4620 128 73 39 24 26 26 179 65 3290 101 25 97 1120 121 72 41 24 20 24 159 65 e730 81 26 85 1110 130 73 50 26 18 22 80 62 e166 65 27 78 e19800 129 71 245 29 19 23 75 64 e161 56 28 72 2310 126 73 56 32 18 20 53 59 e135 54 29 70 386 117 74 41 32 17 23 172 73 e113 54 30 53 207 113 73 --- 28 16 34 71 71 85 53 31 59 --- 179 67 28 --- 83 --- 59 69 --- TOTAL 5319 31342 26743 3353 2007 897 668 1538 3025 5740 6367 7510 MEAN 172 1045 863 108 69.2 28.9 22.3 49.6 101 185 205 250 MAX 2100 19800 11500 394 245 50 46 218 585 1280 3290 2870 MIN 22 39 79 67 37 24 15 16 16 56 39 40 AC-FT 10550 62170 53040 6650 3980 1780 1320 3050 6000 11390 12630 14900 CFSM 2.85 17.4 14.3 1.80 1.15 .48 .37 .82 1.67 3.08 3.41 4.16 IN. 3.29 19.37 16.53 2.07 1.24 .55 .41 .95 1.87 3.55 3.93 4.64 CAL YR 1987 TOTAL 91375 MEAN 250 MAX 19800 MIN 17 AC-FT 181200 CFSM 4.16 IN. 56.46 WTR YR 1988 TOTAL 94509 MEAN 258 MAX 19800 MIN 15 AC-FT 187500 CFSM 4.29 IN. 58.40 e Estimated 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 1987 TO SEPTEMBER 1988 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, 15 1229 133 174 28.0 APR, 08 1427 31.9 346 31.0 NOV, 17 1352 72.9 325 28.0 MAY, 09 1254 28.3 274 30.0 JAN, 11 1616 108.0 308 26.5 JUN, 06 1200 16.7 351 31.0 FEB, 05 1029 62.2 265 24.0 JUL, 14 1150 609 209 25.0 MAR, 04 1021 31.9 328 25.0 253 254 RIO GRANDE DE LOIZA BASIN 50057000 RIO GURABO AT WRABO, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORD.-- Water years 1984 to 1986 PERIOD OF DAILY RECORD.-- SUSPENDED-SEDIMENT DISCHARGE: October 1983 to September 1986. INSTRUMENTATION.-- USD-49 and automatic sediment sampler. REMARKS.-- The suspended-sediment data included in this report is part of a 5-year hydrologic investigation conducted in the Rio Grande de Loiza Basin to account the amount of suspended- sediment transported to Lago Loiza, a water supply reservoir. EXTREMES FOR PERIOD OF DAILY RECORD.-- SEDIMENT CONCENTRATION: Maximum daily mean, 1,870 mg/L May 18, 1985; Minimum daily mean, 6 mg/L August 06, 1985. SEDIMENT LOADS: Maximum daily mean, 93,200 tons (84,570 tonnes) May 18, 1985; Minimum daily mean, 0.23 tons (0.20) May 12, 1984. EXTREMES FOR WATER YEARS 1984-86.-- Water suspeneded-sediment concentration (mg/L) suspended-sediment discharge (tons per day) Year maximum minimum maximum minimum 1984 732 (Nov. 06) 9 (March 24) 7,030 (Nov. 06) 0.23 (May 12) 1985 1,870 (May 18) 6 (August 06) 93,200 (May 18) 0.44 (August 06) 1986 1,670 (Oct. 06) 12 (several days) 60,800 (Oct. 06) 0.53 (April 26) SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE PISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (Li.,) (MG/L) (TONS/DAY) OCTOBER NOVEMBER DECEMBER 1 83 50 11 64 60 10 60 50 8.1 2 60 50 8.1 61 50 8 2 100 50 13 3 82 49 12 52 45 6 3 76 50 10 4 58 48 7.5 1960 514 4320 54 42 6.1 5 52 42 5.9 1520 542 4770 52 42 5.9 6 49 41 5.4 2700 732 7030 70 50 9.5 7 50 40 5.4 297 120 96 52 50 7.0 8 95 59 17 154 80 33 61 50 8.2 9 127 78 24 118 50 16 58 50 7.8 10 76 50 10 101 50 14 53 50 7.2 11 54 45 6.6 89 60 14 51 48 6.6 12 67 54 11 83 60 13 48 45 5.8 13 58 50 7.8 75 60 12 46 40 5.0 14 53 50 7.2 71 60 12 46 40 5.0 15 312 123 297 68 60 11 45 40 4.9 16 129 93 47 69 60 11 50 40 5.4 17 95 70 24 66 50 8.9 49 40 5.3 18 73 70 14 62 50 8.4 46 40 5.0 19 121 83 35 59 50 8.0 45 38 4.6 20 92 71 23 58 50 7.8 42 37 4.2 21 142 114 122 56 50 7.6 44 38 4.5 22 69 60 11 55 50 7.4 45 40 4.9 23 54 45 6.6 53 50 7.2 51 40 5.5 24 47 42 5.3 53 50 7.2 42 40 4.5 25 45 40 4.9 53 50 7.2 39 40 4.2 26 90 65 25 50 40 5.4 36 32 3.1 27 52 42 5.9 49 40 5.3 39 35 3.7 28 46 40 5.0 734 233 1340 38 33 3.4 29 62 48 9.1 178 100 73 39 32 3.4 30 112 73 28 73 50 9.9 43 37 4.3 31 302 154 231 --- --- --- 50 40 5.4 TOTAL 2807 1032.7 9081 17879.8 1570 181.5 255 RIO GRANDE DE 10I1A BASIN 50057000 RIO GURABO AT GURABO, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 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 48 40 5.2 27 26 1.9 31 30 2.5 2 37 35 3.5 27 26 1.9 32 30 2.6 3 33 32 2.9 28 26 2.0 30 30 2.4 4 32 32 2.8 29 27 2.1 28 30 2.3 5 31 30 2.5 28 26 2.0 29 30 2.3 6 30 30 2.4 28 26 2.0 29 30 2.3 7 29 30 2.3 35 31 2.9 28 30 2.3 8 33 30 2.7 36 30 2.9 28 26 2.0 9 33 30 2.7 61 40 9.5 29 26 2.0 10 33 30 2.7 107 72 29 28 26 2.0 11 32 30 2.6 87 59 16 27 26 1.9 12 33 30 2.7 66 50 8.9 25 24 1.6 13 52 43 10 233 122 134 24 24 1.6 14 87 66 17 118 75 24 25 24 1.6 15 46 40 5.0 231 104 267 24 24 1.6 16 38 30 3.1 1610 391 3630 24 23 1.5 17 47 30 3.8 111 80 24 24 23 1.5 18 38 33 3.4 65 40 7.0 25 23 1.6 19 34 32 2.9 50 40 5.4 23 22 1.4 20 109 78 52 44 38 4.5 21 20 1.1 21 51 45 6.2 39 38 4.0 20 20 1.1 22 38 35 3.6 37 32 3.2 -,-; 20 1.1 23 34 35 3.2 35 31 2.9 21 20 1.1 24 34 30 2.8 34 30 2.8 24 9 .58 25 36 30 2.9 33 30 2.7 20 16 .86 26 38 30 3.1 32 30 2.6 19 10 .51 27 31 30 2.5 33 30 2.7 18 10 .49 28 31 30 2.5 34 32 2.9 17 10 .46 29 30 29 2.3 32 31 2.7 17 10 .46 30 29 30 2.3 --- --- --- 17 10 .46 31 28 26 2.0 17 10 .46 TOTAL 1235 165.6 3330 4203.5 744 45.68 APRIL MAY JUNE 1 16 10 .43 14 18 .18 138 50 19 2 16 10 .43 14 15 .57 111 35 10 3 16 10 .43 13 15 .61 81 25 5.5 4 16 10 .43 12 15 .65 100 36 5.9 5 16 10 .43 11 18 .73 73 25 4.9 6 17 10 .46 11 17 .69 262 110 130 I 18 10 .49 11 17 .69 399 175 258 8 19 11 .56 10 15 .61 254 100 69 9 17 11 .50 9.6 17 .64 155 60 25 10 16 10 .43 11 12 .39 1290 439 2970 11 15 10 .41 10 12 .32 352 159 176 12 15 10 .43 8.6 10 .23 170 110 50 13 14 10 .41 15 12 .49 330 159 262 14 14 10 .38 28 15 1.1 168 95 47 15 14 10 .38 15 12 .49 109 70 21 16 14 11 .42 14 11 .42 88 70 17 17 12 12 .42 13 10 .35 76 70 14 18 12 10 .32 13 10 .35 69 52 9.3 19 12 10 .32 12 10 .32 65 50 8.8 20 13 10 .35 12 10 .32 82 50 8.8 21 14 12 .45 13 10 .35 62 48 8.3, 22 14 12 .45 14 11 .42 54 48 8.2 23 14 12 .45 17 20 .92 47 47 7.7 24 13 12 .42 26 25 1.8 44 48 7.6 25 12 12 .42 ?2 25 1.5 44 49 7.3 26 11 12 .42 80 48 18 40 48 6.5 27 21 21 2.0 54 42 6.1 39 43 5.3 28 40 28 3.0 139 73 56 39 34 3.7 29 20 20 1.1 64 50 8.6 211 104 199 30 15 20 .81 448 195 452 167 96 52 31 --- --- --- 362 150 210 --- --- --- TOTAL 476 17.95 1496.2 766.44 5119 4416.8 256 RIO GRANDE DE LOIZA BASIN 50051000 RIO GURABO AT GURABO, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1983 TO SEPTEMBER 1984 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 87 70 16 51 50 E.9 33 38 3.4 2 72 60 12 319 150 190 31 30 2.5 3 71 50 9.6 94 75 19 49 41 8.3 4 66 50 8.9 78 70 15 61 20 4.4 5 355 283 273 77 60 12 140 71 68 6 116 85 27 52 50 7.0 1=.1 102 62 7 77 60 12 43 45 5.2 bb 30 5.3 8 74 60 12 38 32 3.3 41 20 2.2 9 72 60 12 36 31 3.0 36 15 1.5 10 80 65 14 34 30 2.8 47 18 2.3 11 70 70 13 29 28 2.2 39 20 2.1 12 57 55 8.5 26 25 1.8 96 51 22 13 48 50 6.5 25 23 1.6 383 136 392 14 38 50 5.1 23 23 1.4 972 278 889 15 80 70 15 22 23 1.4 163 120 53 16 55 39 5.8 30 23 1.9 509 176 874 17 45 35 4.3 26 21 1.5 633 337 1540 18 46 45 5.6 23 21 1.3 669 288 801 19 44 38 4.5 22 21 1.2 326 161 182 20 46 38 4.7 24 21 1.4 1010 368 1780 21 43 48 5.6 31 21 1.8 429 190 220 22 79 40 8.5 25 20 1.4 186 120 60 23 65 32 5.6 25 19 1.3 119 80 26 24 51 32 4.4 22 20 1.2 93 70 18 25 43 30 3.6 19 20 1.0 80 60 13 26 39 30 3.2 622 227 2260 67 50 9.0 27 40 30 3.2 839 302 1620 59 40 6.4 28 36 35 3.4 151 95 39 59 40 6.4 29 224 199 505 98 60 16 60 38 6.2 30 269 150 109 149 83 70 64 30 5.2 31 76 60 12 44 50 5.9 --- --- --- TOTAL 2564 1133.0 3097 4297.5 6701 7065.2 YEAR 38220.2 41205.67 257 RIO GRANDE DE LOIZA BASIN 50057000 RIO GURABO AT GURABO, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 DAY MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) OCTOBER NOVEMBER DECEMBER 1 2 3 4 5 65 55 120 80 95 55 48 87 61 70 9.7 7.1 41 16 27 165 391 2440 1180 2940 96 168 694 405 754 53 259 5430 1690 8540 72 154 147 86 74 55 91 90 65 60 11 63 36 15 12 6 7 8 9 10 115 75 47 486 430 83 58 40 202 204 31 14 5.1 751 351 3850 2070 599 510 320 969 605 228 248 156 11400 4530 381 483 135 67 63 59 58 81 41 43 38 40 57 7.4 7.3 6.1 6.3 13 11 12 13 14 15 172 160 110 1410 241 100 105 80 396 121 47 45 24 3360 77 200 150 145 240 325 140 110 95 111 156 98 45 37 95 153 171 334 160 76 65 93 157 95 56 50 152 240 60 11 8.8 16 17 18 19 20 161 195 119 94 126 91 105 70 65 79 38 72 22 16 28 148 165 160 134 125 90 95 90 85 80 36 42 39 31 27 65 80 61 54 54 50 58 60 62 62 8.8 13 9.9 9.0 9.0 21 22 23 24 25 125 80 76 68 136 80 55 56 58 83 27 12 11 11 33 115 110 125 109 100 75 70 70 72 70 23 21 24 21 19 48 47 46 54 81 40 40 40 40 57 5.2 5.1 5.0 5.8 13 26 27 28 29 30 31 95 80 123 139 145 92 70 60 76 87 90 68 18 13 27 33 48 17 211 104 91 81 79 --- 114 70 65 60 60 --- 89 20 16 13 13 --- 70 84 104 62 79 87 52 59 71 47 54 60 9.8 15 21 7.9 11 14 TOTAL 5515 5231.9 17382 33763 2743 811.4 258 RIO GRANDE DE LOIZA BASIN 50057000 RIO GURABO AT GURABO, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) JANUARY FEBRUARY MARCH '1 63 52 10 32 25 2.2 99 65 18 2 287 143 136 33 26 2.3 48 42 5.4 3 96 66 18 29 26 2.0 36 35 3.4 4 79 57 12 27 25 1.8 32 30 2.6 5 68 50 9.2 26 25 1.8 28 30 2.3 6 97 65 17 25 25 1.7 '1 35 2.0 7 88 60 14 25 25 1.7 60 21 8 60 60 9.7 24 25 1.6 152 86 37 9 52 60 8.4 24 28 1.8 79 58 13 10 51 60 8.3 24 28 1.8 47 50 6.3 11 50 60 8.1 26 30 2.1 35 57 5.4 12 44 50 5.9 24 33 2.1 29 45 3.5 13 42 40 4.5 22 40 2.4 28 35 2.6 14 40 35 3.8 22 46 2.7 24 28 1.8 15 40 35 3.8 29 30 2.3 22 24 1.4 16 38 35 3.6 27 25 1.8 22 23 1.4 17 36 35 3.4 27 25 1.8 24 25 1.6 18 36 35 3.4 30 28 2.3 41 30 3.3 19 34 30 2.8 29 26 2.0 45 35 4.3 20 34 30 2.8 45 30 3.6 26 25 1.8 21 32 30 2.6 32 30 2.6 34 25 2.3 22 31 30 2.5 28 25 1.9 23 22 1.4 23 30 30 2.4 25 24 1.6 20 20 1.1 24 30 28 2.3 37 32 3.2 19 18 .92 25 29 25 2.0 37 31 3.1 17 15 .69 26 36 25 2.4 34 30 2.8 16 15 .65 27 35 25 2.4 48 36 5.2 23 25 1.6 28 34 25 2.3 273 129 142 35 27 2.6 29 33 25 2.2 --- --- --- 1530 451 3330 30 30 25 2.0 147 88 35 31 30 25 2.0 245 126 116 TOTAL 1685 309.8 1064 204.2 3024 3630.36 APRIL MAY JUNE 1 78 60 13 35 30 2.8 51 19 2.6 2 49 30 4.0 33 30 2.7 49 20 2.6 3 40 30 3.2 40 32 3.5 49 22 2.9 4 35 30 2.8 36 30 2.9 47 23 2.9 5 31 29 2.4 33 30 2.7 45 24 2.9 6 30 28 2.3 38 35 3.6 42 23 2.6 7 32 28 2.4 33 30 2.7 41 23 2.5 8 30 28 2.3 29 30 2.3 43 23 2.7 9 29 27 2.1 28 30 2.3 43 23 2.7 10 27 25 1.8 28 28 2.1 42 22 2.5 11 25 20 1.4 28 26 2.0 41 21 2.3 12 51 40 6.4 45 33 4.0 39 20 2.1 13 33 30 2.7 66 45 8.0 32 20 1.7 14 31 29 2.4 436 203 353 30 20 1.6 15 41 33 3.7 5930 1080 30500 27 20 1.5 16 55 43 6.4 1370 422 3180 27 20 1.5 17 55 43 6.4 2120 597 5150 28 19 1.4 18 46 45 5.6 10900 1870 93200 29 20 1.6 19 36 30 2.9 664 240 473 28 18 1.4 20 27 25 1.8 280 122 76 27 19 1.4 21 29 25 2.0 165 95 42 29 20 1.6 22 25 24 1.6 130 43 15 27 20 1.5 23 1020 262 2120 107 42 12 26 20 1.4 24 426 183 301 93 39 9.8 26 20 1.4 25 206 112 69 84 32 7.3 29 19 1.5 26 133 82 32 76 29 6.0 28 17 1.3 27 68 55 10 69 21 3.9 26 14 .98 28 49 45 6.0 63 18 3.1 23 14 .87 29 42 35 4.0 57 9 1.4 23 21 1.3 30 39 32 3.4 55 8 1.2 20 23 1.2 31 --- --- --- 52 11 1.5 --- --- --- TOTAL 2818 2625.0 23123 133076.8 1017 56.45 259 RIO GRANDE DE LOIZA BASIN 50057000 RIO GURABO Al GURABO, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1984 TO SEPTEMBER 1985 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) JULY AUGUST SEPTEMBER 1 24 36 2.3 29 10 .78 56 18 2.2 2 27 41 3.0 55 19 2.8 45 16 1.8 3 25 51 3.4 39 12 1.3 41 14 1.2 4 27 53 3.9 31 8 .67 32 10 .81 5 22 54 3.2 28 7 .53 82 44 28 6 23 40 2.5 27 6 .44 50 43 7.0 7 21 30 1.7 38 11 1.1 30 28 2.3 8 22 25 1.5 31 9 .75 208 95 146 9 23 22 1.4 30 8 .65 247 122 145 10 24 25 1.6 43 14 1.6 58 46 7.2 11 23 25 1.6 36 11 1.1 50 40 5.4 12 26 25 1.8 32 9 .78 695 194 2070 13 27 27 2.0 49 16 2.1 2380 675 5520 14 24 26 1.9 45 15 1.8 343 157 150 15 101 70 31 32 9 .78 173 102 51 16 218 104 73 27 10 .73 101 83 26 17 195 102 63 26 19 1.3 83 56 13 18 88 62 17 23 16 .99 59 45 7.2 19 48 35 4.0 27 20 1.5 49 40 5.3 20 401 202 472 29 26 2.0 41 32 3.5 21 126 70 24 41 43 4.8 37 30 3.0 22 65 48 8.4 36 40 3.9 35 30 2.8 23 51 38 5.2 27 34 2.5 40 35 3.8 24 77 27 5.6 26 35 2.5 87 69 21 25 53 18 2.6 26 33 2.3 778 301 1130 26 51 17 2.3 31 33 2.8 137 90 38 27 42 13 1.5 466 196 399 98 77 27 28 42 13 1.5 229 119 77 253 126 164 29 49 16 2.1 77 60 7.5 159 97 47 30 41 12 1.3 46 30 4.2 75 70 14 31 32 10 .86 52 34 5.1 --- --- TOTAL 2018 747.16 1734 535.30 6522 9643.51 YEAR 68645 190634.88 260 RIO GRANDE DE LOILA BASIN 50057000 RIO GURABO Al GURABO, 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 1 210 123 148 235 150 106 65 50 8.8 2 725 302 907 199 120 64 65 50 8.8 3 205 129 79 177 110 53 65 50 8.8 4 214 135 133 149 90 36 62 50 8.4 5 833 319 921 177 104 59 89 60 14 6 8800 1670 60800 164 100 44 97 60 16 7 5470 1270 26400 139 82 31 82 55 12 8 1900 555 4740 114 80 25 70 55 10 9 413 180 201 104 80 22 69 52 9.7 10 261 130 92 98 70 19 70 50 9.5 11 202 120 65 101 70 19 68 50 9.2 12 168 100 45 173 110 51 74 50 10 13 149 90 36 265 150 139 71 50 9.6 14 136 85 31 198 160 86 61 52 8.6 15 119 75 24 2060 603 5540 60 52 8.4 16 111 75 22 584 232 458 63 53 9.0 17 128 90 31 233 120 75 59 51 8.1 18 587 218 1010 583 248 521 59 50 8.0 19 282 140 107 231 130 81 59 50 8.0 20 148 90 36 190 110 56 63 52 8.3 21 126 80 27 410 183 332 55 50 7.4 22 113 80 24 125 90 30 54 48 7.0 23 1170 411 2890 96 70 18 52 45 6.3 24 1840 560 4820 88 65 15 53 43 6.2 25 860 331 1810 83 50 11 50 42 5.7 26 351 163 176 80 50 11 56 45 6.8 27 317 160 137 78 55 12 49 45 6.0 28 240 140 91 72 50 9.7 47 42 5.3 29 973 398 2210 69 50 9.3 47 38 4.8 30 384 176 204 66 50 8.9 43 35 4.1 31 406 277 368 --- --- --- 43 39 4.5 TOTAL 27841 108585 7341 7941.9 1920 257.3 281 RIO GRANDE DE LOIZA BASIN 50057000 RIO GURABO AT GURABO, PR--Continu,1 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 44 45 5.3 32 26 2.2 21 20 1.1 2 59 45 7.2 30 26 2.1 21 20 1.1 3 47 42 5.3 31 25 2.1 21 20 1.1 4 48 43 5.6 64 60 10 20 20 1.1 5 48 43 5.6 70 45 8.5 27 21 1.5 6 40 39 4.2 39 38 4.0 25 21 1.4 7 37 38 3.8 32 30 2.6 23 20 1.2 8 35 35 3.3 30 30 2.4 21 20 1.1 9 83 60 13 30 29 2.3 20 20 1.1 10 94 80 20 29 28 2.2 20 20 1.1 11 50 45 6.1 28 30 2.3 21 20 1.1 12 41 40 4.4 27 31 2.3 25 22 1.5 13 36 39 3.8 25 32 2.2 22 25 1.5 14 34 35 3.2 24 30 1.9 38 35 3.6 15 33 30 2.7 24 28 1.8 173 98 64 16 33 30 2.7 25 25 1.7 51 50 6.9 17 76 54 19 25 25 1.7 32 38 3.3 18 56 45 6.8 30 28 2.3 26 30 2.1 19 41 30 3.3 31 27 2.3 20 25 1.4 20 35 30 2.8 28 23 1.7 20 20 1.1 21 37 31 3.1 28 22 1.7 19 18 .92 22 35 30 2.8 27 20 1.5 19 18 .92 23 35 30 2.8 25 19 1.3 16 15 .65 24 43 32 3.7 23 16 .99 19 15 .77 25 46 32 4.0 23 18 1.1 16 18 .78 26 37 31 3.1 24 19 1.2 25 19 1.3 27 31 30 2.5 21 20 1.1 24 18 1.2 28 30 28 2.3 21 20 1.1 19 15 .77 29 30 28 2.3 --- --- 179 82 82 30 32 28 2.4 84 55 12 31 34 27 2.5 71 55 11 TOTAL 1360 159.6 846 68.59 1138 210.61 APRIL MAY JUNE 1 138 90 45 55 45 6.7 182 103 55 2 51 32 4.4 32 30 2.6 126 83 31 3 40 28 3.0 21 22 1.2 126 80 27 4 42 40 4.5 19 15 .77 85 50 11 5 129 70 43 15 15 .61 140 88 39 6 132 55 20 21 19 1.1 85 60 14 7 45 38 4.6 205 119 125 71 60 12 8 85 50 11 192 113 159 164 101 59 9 175 109 78 515 177 471 304 324 558 10 44 45 5.3 678 245 861 269 139 153 11 31 32 2.7 818 296 902 124 78 26 12 28 30 2.3 158 100 43 89 70 17 13 26 27 1.9 3090 797 13300 106 80 23 14 24 22 1.4 3050 535 10900 145 85 33 15 23 19 1.2 260 160 112 94 75 19 16 22 18 1.1 174 110 52 156 103 50 17 21 12 .68 136 90 33 96 72 19 18 19 12 .62 464 200 467 81 65 14 19 17 12 .55 249 137 108 102 67 18 20 24 13 .84 160 90 39 73 60 12 21 21 16 .91 136 80 29 60 50 8.1 22 20 18 .97 128 80 28 59 48 7.6 23 16 19 .82 104 75 21 66 43 7.7 24 16 18 .78 88 65 15 51 40 5.5 25 15 18 .73 72 60 12 50 30 4.1 26 13 15 .53 66 50 8.9 51 25 3.4 27 16 15 .65 71 50 9.6 55 22 3.3 28 49 38 5.0 68 50 9.2 66 22 3.9 29 1240 412 4660 75 50 10 61 22 3.6 30 253 200 137 70 45 8.5 57 22 3.4 31 --- --- --- 476 230 582 --- --- --- TOTAL 2775 5039.48 11666 28318.18 3194 1240.6 262 RIO GRANDE DE LOIZA BASIN 50057000 RIO GURABO AT GURABO, 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 51 22 3.0 55 45 6.7 99 75 20 2 50 21 2.8 40 35 3.8 68 50 9.2 3 49 20 2.6 32 30 2.6 48 35 4.5 4 47 20 2.5 29 25 2.0 42 35 4.0 5 45 20 2.4 27 24 1.7 41 35 3.9 6 126 55 50 26 22 1.5 69 50 9.3 7 122 132 53 29 20 1.6 57 35 5.4 8 48 55 7.1 67 45 8.1 39 31 3.3 9 37 32 3.2 27 30 2.2 35 29 2.7 10 34 30 2.8 31 40 3.3 33 25 2.2 11 33 30 2.7 98 78 30 31 23 1.9 12 40 30 3.2 50 40 5.4 29 25 2.0 13 34 30 2.8 39 30 3.2 29 28 2.2 14 34 25 2.3 152 94 78 41 25 2.8 15 73 40 7.9 38 28 2.9 32 25 2.2 16 55 40 5.9 52 35 4.9 29 22 1.7 17 37 28 2.8 33 25 2.2 27 20 1.5 18 36 27 2.6 29 25 2.0 26 19 1.3 19 31 27 2.3 28 25 1.9 25 19 1.3 20 28 25 1.9 27 25 1.8 24 19 1.2 21 28 22 1.7 23 25 1.6 23 19 1.2 22 26 21 1.5 25 25 1.7 24 20 1.3 23 26 21 1.5 30 22 1.8 29 20 1.6 24 25 21 1.4 30 20 1.6 57 25 3.8 25 25 20 1.4 31 21 1.8 49 25 3.3 26 23 20 1.2 27 20 1.5 37 25 2.5 27 24 20 1.3 26 18 1.3 31 22 1.8 28 27 20 1.5 102 57 76 32 22 1.9 29 34 25 2.3 1970 542 5890 28 21 1.6 30 285 169 247 132 80 29 26 21 1.5 31 146 88 45 87 60 14 --- --- --- TOTAL 1679 469.6 3392 6186.1 1160 103.1 YEAR 64312 158580.06 RIO GRANDE DE LOIZA BASIN 263 50057000 RIO GURABO AT GURABO--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY). WATER YEAR OCTOBER 1986 TO SEPTEMBER 1987 DAY MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) OCTOBER NOVEMBER DECEMBER ' 1 2 3 4 5 27 25 23 23 23 30 30 27 27 27 2.2 2.0 1.7 1.7 1.7 59 71 72 51 101 60 70 70 56 90 9.6 13 14 7.7 25 72 70 79 72 67 75 70 80 80 66 15 13 17 16 12 6 7 8 9 10 22 26 27 30 46 26 28 30 38 45 1.5 2.0 2.2 3.1 5.6 113 211 291 131 199 100 203 268 110 157 31 248 302 39 95 62 93 69 65 69 65 85 75 70 70 11 21 14 12 13 11 12 13 14 15 33 27 24 31 51 37 30 26 33 60 3.3 2.2 1.7 2.8 8.3 197 1530 527 244 209 164 929 396 197 160 102 5730 1020 145 90 174 99 92 107 84 147 40 50 90 60 122 11 12 26 14 16 17 18 19 20 120 66 39 29 25 110 65 40 33 29 41 12 4.2 2.6 2.0 280 186 120 93 93 217 150 100 65 40 189 75 32 16 10 'JD 73 70 61 65 85 80 75 66 66 22 16 14 11 12 21 22 23 24 25 22 218 63 87 164 25 182 69 85 148 1.5 220 13 20 122 76 75 68 64 96 28 22 18 15 70 5.7 4.5 3.3 2.6 18 63 56 55 54 86 65 65 60 60 85 11 9.8 8.9 8.7 20 26 27 28 29 30 31 116 176 146 66 61 61 114 189 136 70 65 62 48 171 70 12 11 10 181 218 115 95 96 --- 159 190 110 95 85 --- 88 139 34 24 22 --- 65 84 102 65 57 57 70 70 105 70 60 58 12 16 29 12 9.2 8.9 TOTAL 1897 802.3 5862 8534.4 2382 549.5 264 RIO GRANDE DE LOIZA BASIN 50057000 RIO GURABO AT GURABO--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR lCTOBER 1986 TO SEPTEMBER 1987 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) JANUARY FEBRUARY MARCH 1 54 55 8.0 70 75 14 44 18 2.1 2 53 52 7.4 44 50 5.9 42 18 2.0 3 50 52 7.0 38 43 4.4 41 18 2.0 4 51 60 8.3 35 30 2.8 76 65 13 5 88 80 19 35 22 2.1 174 157 107 6 119 110 35 39 18 1.9 61 35 5.8 7 187 158 98 38 15 1.5 49 30 4.0 8 66 70 12 35 12 1.1 45 28 3.4 9 71 70 13 31 7 .59 42 25 2.8 10 47 40 5.1 29 6 .47 42 21 2.4 11 44 25 3.0 192 181 139 42 23 2.6 12 41 18 2.0 73 75 15 73 55 11 13 39 15 1.6 136 127 96 47 12 1.5 14 39 18 1.9 154 142 68 42 12 1.4 15 45 25 3.0 101 100 27 42 13 1.5 16 38 25 2.6 64 60 10 95 62 54 17 35 25 2.4 56 45 6.8 152 140 68 18 34 22 2.0 52 39 5.5 77 85 18 19 33 21 1.9 50 38 5.1 37 45 4.5 20 33 20 1.8 48 35 4.5 31 40 3.3 21 31 19 1.6 48 32 4.1 27 35 2.6 22 31 19 1.6 46 28 3.5 26 30 2.1 23 49 35 4.6 44 25 3.0 25 25 1.7 24 54 25 3.6 41 20 2.2 22 20 1.2 25 37 22 2.1 42 18 2.0 24 20 1.3 26 35 22 2.1 43 15 1.7 24 20 1.3 27 33 21 1.9 47 15 1.9 22 20 1.2 28 32 20 1.7 45 15 1.8 21 20 1.1 29 33 25 2.2 --- --- --- 20 20 1.1 30 145 134 71 20 20 1.1 31 74 90 18 18 20 .97 TOTAL 1721 345.4 1676 431.86 1503 325.97 285 RIO GRANDE DE LOIZA BASIN 50057000 RIO GURABO AT GURABO--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1986 TO SEPTEMBER 1987 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) APRIL MAY JUNE 1 18 19 .92 29 10 .78 57 60 9.2 2 17 17 .78 30 11 .89 169 152 164 3 18 15 .73 47 25 3.2 310 299 597 4 22 15 .89 44 40 4.8 176 200 93 5 21 12 .68 51 55 7.6 72 45 8.7 6 21 11 .62 348 285 425 59 35 5.6 7 30 11 .89 71 55 11 53 32 4.6 8 19 11 .56 48 31 4.0 47 30 3.8 9 18 11 .53 40 30 3.2 50 30 4.1 10 78 63 59 46 45 5.6 64 30 5.2 11 83 95 31 63 55 9.4 54 35 5.1 12 222 181 220 136 115 42 45 35 4.3 13 210 170 133 57 65 10 78 75 16 14 177 150 155 45 55 6.7 80 80 17 15 128 178 83 39 49 5.2 612 445 2780 16 58 60 9.4 36 42 4.1 316 277 320 17 341 285 532 34 36 3.3 128 110 38 18 88 90 21 33 35 3.1 98 100 26 19 55 60 8.9 72 50 9.7 360 320 750 20 49 45 6.0 379 255 438 1640 1150 7790 21 44 35 4.2 367 296 528 2050 1310 16100 22 41 38 4.2 167 150 68 3950 2370 34000 23 38 33 3.4 109 100 29 393 265 281 24 36 15 1.5 68 70 13 204 160 88 25 34 10 .92 155 150 63 160 130 56 26 33 9 .80 1060 714 5550 140 125 47 27 32 8 .69 474 427 1040 233 197 193 28 31 8 .67 187 180 91 205 183 114 29 30 10 .81 87 85 20 164 140 62 30 29 10 .78 81 70 15 138 110 41 31 --- --- --- 57 60 9 2 --- -_, --- TOTAL 2021 1282.87 4460 8423.77 12105 63623.6 266 RIO GRANDE DE 10IZA BASIN 50057000 RIO GURABO AT GURABO--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1986 TO SEPTEMBER 1987 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) JULY AUGUST SEPTEMBER 1 109 40 12 36 35 3.4 54 60 8.7 2 97 15 3.9 43 39 4.5 86 100 23 3 103 15 4.2 51 148 141 46 55 6.8 4 90 25 6.1 211 92 26 37 40 4.0 5 153 130 54 65 62 11 36 37 3.6 6 85 85 20 64 60 10 31 35 2.9 7 84 82 19 56 59 8.9 28 32 2.4 8 105 100 28 48 57 7.4 30 30 2.4 9 72 82 16 46 55 6.8 28 30 2.3 10 69 70 13 54 52 7.6 35 45 4.3 11 53 50 7.2 43 50 5.8 43 50 5.8 12 50 35 4.7 40 45 4.9 28 35 2.6 13 48 28 3.6 45 40 4.9 24 32 2.1 14 47 20 2.5 37 35 3.5 24 30 1.9 15 95 80 21 34 35 3.2 26 30 2.1 16 64 55 9.5 40 35 3.8 24 27 1.7 17 39 15 1.6 31 35 2.9 21 24 1.4 18 43 15 1.7 31 35 2.9 30 25 2.0 19 55 45 6.7 32 33 2.9 45 60 7.3 20 71 70 13 40 32 3.5 39 36 3.8 21 79 70 15 38 32 3.3 25 29 2.0 22 68 70 13 32 30 2.6 30 28 2.3 23 45 42 5.1 29 30 2.3 28 27 2.0 24 46 42 5.2 28 30 2.3 29 35 2.7 25 37 45 4.5 27 30 2.2 32 32 2.8 26 38 50 5.1 33 31 2.8 24 29 1.9 27 43 45 5.2 37 32 3.2 21 28 1.6 28 53 42 6.0 27 31 2.3 20 25 1.4 29 48 40 5.2 26 30 2.1 21 25 1.4 30 48 40 5.2 25 30 2.0 85 70 16 31 34 36 3.3 35 33 3.1 --- --- --- TOTAL 2071 320.5 1384 293.1 1030 125.2 YEAR 38112 85058.47 287 RIO GRANDE OE LOIZA BASIN 50057000 RIO GURABO AT GURABO--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 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 50 55 7.4 59 45 7.2 143 130 50 2 33 30 2.7 45 28 3.4 455 386 962 3 33 32 2.9 40 27 2.9 119 100 32 4 57 60 9.2 123 126 61 95 80 21 5 41 37 4.1 100 108 38 79 80 17 6 32 37 3.2 235 306 370 641 670 4020 7 35 37 3.5 104 100 28 9720 4520 424000 8 30 36 2.9 60 60 9.7 11500 5800 476000 9 30 35 2.8 51 50 6.9 516 638 1080 10 29 32 2.5 50 50 6.8 315 250 213 11 23 30 1.9 46 48 6.0 227 195 120 12 22 30 1.8 58 60 9.4 186 160 80 13 22 28 1.7 63 45 7.7 164 140 62 14 256 197 269 41 38 4.2 150 130 53 15 161 145 70 39 35 3.7 143 130 50 16 173 162 111 44 35 4.2 139 120 45 17 667 1110 4220 73 50 9.9 131 120 42 18 2100 1610 25800 150 178 111 128 120 41 19 557 326 957 66 70 12 146 140 55 20 153 75 31 70 65 12 179 145 70 21 97 40 10 47 50 6.3 173 160 75 22 72 40 7.8 44 50 5.9 212 170 97 23 62 40 6.7 181 158 289 139 110 41 24 70 40 7.6 4620 5910 95000 128 110 38 25 97 35 9.2 1120 525 2720 121 110 36 26 85 30 6.9 1110 994 8970 130 110 39 27 78 30 6.3 19800 9220 686000 129 105 37 28 72 98 24 2310 1410 18000 126 100 34 29 70 55 10 386 280 292 117 100 32 30 53 12 1.7 207 140 78 113 100 31 31 59 40 6.4 --- --- --- 179 120 58 TOTAL 5319 31601.2 31342 812075.2 26743 907531 268 RIO GRANDE DE LOU); BASIN 50057000 RIO GURABO AT GURABO--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 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 1 394 335 430 139 60 23 37 40 4.0 2 192 190 98 113 60 18 50 45 6.1 3 138 70 26 147 115 46 36 15 i.5 4 116 30 9.4 89 80 19 32 10 .86 5 124 25 8.4 66 60 11 32 10 .86 6 127 28 9.6 69 35 6.5 30 10 .81 7 121 28 9.1 52 25 3.5 30 10 .81 8 117 30 9.5 50 20 2.7 30 10 .81 9 121 29 9.5 57 35 5.4 29 10 .78 10 121 29 9.5 74 70 14 27 10 .73 11 113 29 8.8 55 60 8.9 27 10 .73 12 120 30 9.7 51 58 8.0 27 10 .73 13 104 25 7.0 89 85 20 27 10 .73 14 107 22 6.4 72 70 14 28 10 .76 15 98 20 5.3 54 55 8.0 26 10 .70 16 91 18 4.4 62 45 7.5 26 10 .70 17 89 15 3.6 50 35 4.7 26 10 .70 18 90 12 2.9 45 32 3.9 26 10 .70 19 84 10 2.3 43 28 3.3 25 10 .68 20 82 11 2.4 42 20 2.3 '6 10 .70 21 79 11 2.3 40 15 1.6 27 10 .73 22 75 10 2.0 39 12 1.3 26 10 .70 23 74 10 2.0 37 12 1.2 24 10 .65 24 73 10 2.0 39 12 1.3 24 10 .65 25 72 10 1.9 41 11 1.2 24 10 .65 26 73 10 2.0 50 20 2.7 26 10 .70 27 71 11 2.1 245 216 222 29 10 .78 28 73 11 2.2 56 80 12 32 10 .86 29 74 10 2.0 41 52 5.8 32 10 .86 30 73 10 2.0 --- --- --- 28 10 .76 31 67 12 2.2 28 10 .76 TOTAL 3353 694.5 2007 478.8 897 32.49 269 RIO GRANDE DE LOIZA BASIN 50057000 RIO GURABO AT GURABO--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 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 23 10 .62 21 12 .68 32 35 3.0 2 22 10 .59 20 11 .59 23 26 1.6 3 21 10 .57 17 10 .46 20 22 1.2 4 20 10 .54 16 10 .43 19 21 1.1 5 20 10 .54 16 12 .52 '9 20 .97 6 27 15 1.1 218 163 174 18 20 .97 7 38 25 2.6 155 178 96 17 20 .92 8 24 25 1.6 46 40 5.0 16 20 .86 9 22 20 1.2 29 30 2.3 17 20 .92 10 20 20 1.1 77 85 86 21 22 1.2 11 22 15 .89 162 133 102 18 22 1.1 12 21 15 .85 53 50 7.2 53 49 15 13 19 12 .62 32 38 3.3 29 30 2.3 14 18 11 .53 31 33 2.8 40 50 15 32 30 2.6 59 55 8.8 585 541 17A.4 16 27 25 1.8 41 40 4.4 244 213 174 17 20 20 1.1 32 35 3.0 164 168 109 18 20 19 1.0 31 32 2.7 62 60 10 19 22 17 1.0 33 35 3.1 43 40 4.6 20 17 15 .69 46 45 5.6 272 232 341 21 18 16 .78 74 70 14 251 208 182 22 15 15 .61 45 40 4.9 162 140 61 23 46 40 5.0 29 30 2.3 112 120 36 24 26 30 2.1 26 28 2.0 179 158 95 25 20 20 1.1 24 25 1.6 159 144 130 26 18 15 .73 22 22 1.3 80 80 17 27 19 15 .77 23 20 1.2 75 80 16 28 18 13 .63 20 20 1.1 53 50 7.2 29 17 12 .55 23 25 1.6 172 154 88 30 16 12 .52 34 40 3.7 71 70 13 31 --- ___ --- 83 80 18 --- --- --- TOTAL 668 34.33 1538 560.58 3025 3040.34 270 RIO GRANDE DE LOIZA BASIN 50057000 RIO GURABO AT GURABO--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN MEAN MEAN MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT DISCHARGE TRATION DISCHARGE DISCHARGE TRAT1ON DISCHARGE DISCHARGE TRATION DISCHARGE DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) JULY AUGUST SEPTEMBER 1 570 420 1180 52 50 7.0 60 65 11 2 793 607 2290 47 50 6.3 55 60 8.9 3 172 145 75 44 50 5.9 51 57 7.8 4 87 80 19 57 50 7.7 49 56 7.4 5 62 70 12 46 50 6.2 46 55 6.8 6 119 103 44 41 45 5.0 40 50 5.4 7 1280 906 5780 68 80 15 42 50 5.7 8 148 60 24 76 60 12 45 50 6.1 9 92 40 9.9 49 50 6.6 221 183 171 10 96 38 9.8 119 119 70 210 212 177 11 98 40 11 217 203 157 2870 1260 25200 12 102 40 11 109 105 31 930 653 2690 13 69 38 7 1 58 70 11 320 256 268 14 780 479 2490 48 60 7.8 353 311 377 15 108 105 31 47 55 7.0 232 208 158 16 77 80 17 45 60 7.3 161 140 61 17 66 75 13 96 100 26 102 105 29 18 72 80 16 68 80 15 75 80 16 19 94 90 23 49 65 8.6 597 300 1270 20 68 80 15 42 60 6.8 191 100 52 21 56 60 9.1 39 60 6.3 121 95 31 22 129 120 42 70 94 36 120 100 32 23 84 100 23 131 143 75 155 175 73 24 65 80 14 3290 1810 50000 101 110 30 25 65 76 13 730 540 1060 81 80 17 26 62 70 12 166 128 55 65 45 7.9 27 64 70 12 161 128 56 56 60 9.1 28 59 60 9 6 135 123 45 54 60 8.7 29 73 85 17 113 110 34 54 57 8.3 30 71 70 13 85 80 18 53 55 7.9 31 59 60 9.6 69 70 13 --- --- --- TOTAL 5740 12252.1 6367 51817.5 7510 30753.0 YEAR 94509 1850871.04 RIO GRANDE DE LOIZA BASIN 50057025 RIO GURABO NEAR GURABO, PR WATER-QUALITY RECORDS LOCATION.--Lat 18- 15'56", long 65- 59'04", at bridge on Highway 941, 1.2 mi (1.9 km) west-northwest from gaging station 50057000, and 1.0 mi (1.6 km) northwest of Gurabo plaza. DRAINAGE AREA.--62.8 mi' (162.7 km:). PERIOD OF RECORD.--Water years 1919 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DES- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1987 21... 0730 95 254 7.40 27.0 24 4.6 58 68 K9100 4100 DEC 18... 0730 E425 350 6.40 25.0 5.4 4.2 50 43 K1200 720 FEB 1988 18... 1330 382 6.80 29.0 4.4 57 3200 K1600 APR 08... 0910 25 418 7.40 27.5 17 3.5 44 95 K750 K220 JUN 06... 0910 19 400 7.30 29.5 35 3.7 48 41 4700 290 AUG 18... 1220 E30 330 7.20 28.5 25 4.2 54 16 27000 2700 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SIUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DES- 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 1987 21... 77 3 18 7.7 20 1 4.9 74 <0.5 16 18 DEC 18... 110 FEB 1988 18... 120 APR 08... 130 0 29 13 31 1 4.2 110 <0.5 23 32 JUN 06... 130 AUG 18... 110 1 24 11 25 1 4.8 100 14 22 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DES- 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 1987 21... 0.10 27 156 40 20 0.88 0.12 1.0 0.44 0.0 DEC 18... 16 0.81 0.09 0.9 0.20 0.40 FEB 1988 18... 1.08 0.12 1.2 0.38 0.72 APR 08... 0.20 29 242 16 37 0.85 0.15 1.0 0.73 0.77 JUN 06... 52 0.53 0.07 0.6 0.13 0.67 AUG 18... 0.10 28 191 23 0.88 0.12 1.0 0.58 0.72 K = non-ideal count E = estimate 271 272 RIO GRANDE DE LOIZA BASIN 50057025 RIO GURABO NEAR GURABO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 10 SEPTEMBER 1988 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA • NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1987 21... 0.4 1.4 6.2 2.2 1 <100 90 ,1 <1 10 DEC 18... 0.6 1.5 6.6 0.24 FEB 1988 18... 1.1 2.3 10 0.39 APR 08... 1.5 2.5 11 0.50 1 100 <10 <1 ,1 10 JUN 06... 0.8 1.4 6.2 0.29 AUG 18... 1.3 2.3 10 0.40 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1987 21... 1900 <5 230 <0.10 2 <1 10 <0.010 6 0.04 DEC 18... FEB 1988 18... APR 08... 1000 <5 550 <0.10 <1 <1 20 <0.010 3 0.04 JUN 06... AUG 18... 273 RIO GRANDE DE LOIZA BASIN 50059000 LAGO LOIZA AT DAMSITE, PR LOCATION.--Lat 18°19'49", Long 66°01'00", Hydrologic Unit 21010005, at pumpsite at damsite, and 1.9 mi (3.1 km) south of Trujillo Alto plaza. DRANAIGE AREA.--208 mil (539 km 2 ). ELEVATION RECORDS PERIOD OF RECORD.--December 1987 to September 1988. GAGE.--Water-stage recorder. Datum of gage is 97.99 ft (29.867 m) above mean sea level (Puerto Rico Aqueduct and Sewer Authority benchmark); gage readings have been reduced to elevations above mean sea level. REMARKS.--Satellite data collection platform at station. Lake is formed by Loiza Oam, a concrete structure completed in 1954. Useable capacity of impoundment is 30,000 acre-ft (37.0 hm 3 ). Out flow from lake is contolled by five slide gates in powerplant and pump intake structure, four sluice gates, and concrete spillway with eight radial gates. Lake is used for municipal water supply and intermittent power generation. EXTREMES FOR PERIOD OF RECORD.--Maximun elevation 136.16 ft (41.50 m), July 2; minimun elevation, 125.86 ft (38.36 m), June 12. ELEVATION (FEET NGVD), WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 OBSERVATION AT 24:00 VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 134.74 134.46 135.16 132.30 129.30 128.84 134.17 134.56 133.96 2 135.23 135.16 134.41 132.13 129.14 128.59 134.53 134.67 134.23 3 134.27 134.07 134.48 131.99 128.88 128.31 135.05 134.90 134.56 4 135.02 134.61 134.45 131.79 128.59 128.03 134.83 134.24 134.84 5 134.43 134.93 134.39 131.62 128.32 127.72 134.48 134.38 135.06 6 134.44 135.15 134.35 131.83 128.96 127.41 134.65 134.43 134.51 7 134.54 134.54 134.29 131.89 129.33 127.05 134.81 134.74 134.77 8 135.14 134.41 134.23 131.75 129.21 126.68 134.96 135.00 135.09 9 134.29 134.56 134.17 131.61 129.48 126.35 134.66 133.96 134.02 10 134.94 134.80 134.07 131.41 130.44 126.09 134.51 134.18 133.99 11 133.95 134.91 133.97 131.36 131.07 125.93 134.98 133.95 133.99 12 134.62 135.17 133.88 131.19 131.14 126.56 134.80 134.42 134.40 13 133.95 134.44 133.76 130.98 131.07 126.49 135.15 134.69 135.23 14 134.49 134.68 133.63 130.81 130.98 126.41 134.97 134.87 135.25 15 134.86 134.89 133.51 130.74 130.97 129.42 134.58 134.39 135.51 16 135.12 135.05 133.40 130.72 130.88 130.93 134.94 134.66 135.50 17 134.27 134.55 133.37 130.76 130.74 131.36 134.46 133.94 135.50 18 134.54 134.56 133.11 131.62 130.62 131.42 134.93 134.95 135.49 19 134.77 134.57 132.97 131.68 130.51 131.44 134.48 134.15 134.49 20 134.96 134.62 132.93 131.52 130.53 132.29 134.73 134.28 134.46 21 135.09 134.63 132.83 131.39 130.61 133.34 134.86 134.38 134.40 22 135.17 134.61 132.69 131.21 130.63 133.94 134.58 134.43 134.63 23 135.18 134.61 132.52 131.09 130.43 134.26 134.98 133.94 134.41 24 135.19 134.66 132.37 130.95 130.22 134.86 134.87 134.21 134.67 25 134.42 134.00 134.69 132.31 130.72 129.97 135.23 134.83 133.89 134.55 26 135.20 134.10 135.16 132.24 130.49 129.74 135.05 134.36 134.45 134.92 27 134.37 134.23 134.90 132.30 130.28 129.51 134.77 134.57 134.38 134.40 28 135.11 134.40 135.09 132.46 130.05 129.25 134.86 134.55 133.95 134.41 29 134.39 134.77 135.12 132.59 129.77 129.06 134.68 134.78 134,75 134.64 30 134.82 134.94 132.56 129.52 128.99 134.59 134.78 134,04 135.00 31 134.59 135.14 132.45 129.05 134.38 133.96 MEAN 134.67 134.74 133.41 131.17 129.92 130.43 134.72 134.38 134.70 MAX 135.23 135.17 135.16 132.30 131.14 135.23 135.15 135.00 135.51 MIN 133.95 134.07 132.24 129.52 128,32 125.93 134.17 133.89 133,96 WTR YR 1988 MEAN 133.17 MAX 135.51 MIN 125.93 274 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 plaza. DRAINAGE AREA.--208 sq mi (539 sq km). PERIOD OF RECORD.--Water years 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 DIS- OXYGEN, OXYGEN COIL- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1987 05... 1220 287 7.00 29.5 0.4 5 27 K60 K140 DEC 7... 1230 178 7.00 26.0 4.4 54 18 300 K180 FEB 1988 16... 0940 215 6.90 25.5 2.0 24 57 K91 K170 APR 06... 1325 317 7.30 27.0 2.0 25 13 K4 K120 JUN 03... 1140 300 7.10 31.0 2.6 35 33 K10 K120 AUG 05... 1210 225 6.30 30.0 3.1 40 28 K8 48 ALKA- RESIDUE NITRO- LINITY TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- GEN,AM- WAT WH AT 105 GEN, GEN, GEN, GEN, GEN, MONIA + NITRO- TOT FET SULFIDE DEG. C, NITRATE NITRITE N020403 AMMONIA ORGANIC ORGANIC GEN, FIELD TOTAL SUS- TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL DATE MG/L AS (MG/L PENDED (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L CAC03 AS S) (MG/L) AS N) AS N) AS N) AS N) AS N) AS N) AS N) OCT 1987 05... 94 <0.5 <1 0.07 0.03 0.10 0.32 0.48 0.8 0.J DEC 07... 54 6 0.83 0.07 0.90 0.14 0.16 0.3 1.2 FEB 1988 18... 62 33 0.95 0.05 1.00 0.21 0.59 0.8 1.8 APR 06... 98 <0.5 <1 0.36 0.04 0.40 0.10 0.40 0.5 0.9 JUN 03... 92 4 0.15 0.05 0.20 0.20 0.10 0.3 0.5 AUG 05... 66 6 0.48 0.02 0.50 0.10 0.50 0.6 1.1 MANGA- METHY- BORON, COPPER, IRON, NESE, ZINC, LENS NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL BLUE GEN, PHOROUS RECOV- RECOV- RECOV- RECOV- RECOV- CYANIDE ACTIVE TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE TOTAL PHENOLS SUB- DATE (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS NO3) AS P) AS B) AS CU) AS FE) AS MN) AS ZN1 8 C CN) (UG/L) (MG/L) OCT 1987 05... 4.8 0.24 80 10 280 310 50 <0.01 3 0.05 DEC 07... 5.3 0.11 FEB 1988 18... 8.0 0.19 APR 6... 4.0 0.17 <10 <10 100 100 40 ,0.01 3 0.05 JUN 03... 2.2 0.17 AUG 05... 4.9 0.16 K = non-ideal count 275 RIO GRANDE DE LOIZA BASIN 50059050 RIO GRANDE DE LO1ZA BELOW DAMSITE, PR LOCATION.--Lat 18°20'33" , long 66°00'20", Hydrologic Unit 21010005, on left bank of Highway 175; 1.1 mi (1.8 Km) downstream of lago Loiza Dam. DRAINAGE AREA.--209 mil (541 km 2). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--December 1986 to current year. GAGE.--Water-stage recorder. Elevation of gage is 32 ft (10 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. Flow regulated by Lago Loiza Dam. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 124,300 ft'is (3,520 m'/s), Nov. 27, 1987, gage height, 39.57 ft (12.1 s), from floodmarks and rating curve extended above 100 ft'is (2.83 m'/s) on basis of step-back water analysis; minimum discharge, 1.6 ft'A (0.045 20/s), July 7, 1988. EXTREMES FOR CURRENT YEAR.--Maximum discharge, 124,300 ft 3 /s (3,520 03/s), Nov. 27, 1987, gage height, 39.57 ft (12.1 a), from floodmarks and rating curve extended above 100 ftgs (2.83 m'/s) on basis of step-back water analysis; minimum discharge, 1.6 ft'/s (0.045 m'/s), July 7, 1988. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1937 TO SE°TEMBER 1988 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 61 66 393 1500 165 83 61 54 42 668 7.3 1030 2 62 66 571 618 78 342 62 51 42 4420 5.8 11 3 61 64 439 838 743 61 61 49 41 254 5.9 10 4 61 65 18 44 53 62 61 42 38 46 370 9.8 5 61 416 348 557 56 62 60 43 37 133 5.7 9.9 6 61 134 801 240 78 63 54 43 37 123 5.7 348 7 62 58 e17800 379 226 62 55 44 38 1430 5.6 21 8 63 71 e40000 65 205 62 45 45 42 123 6.1 11 9 61 71 el0000 850 71 65 42 57 42 171 397 e1000 10 61 67 e1520 78 73 63 45 88 40 202 994 e15 11 63 64 628 811 73 63 48 55 26 5.7 1230 e2750 12 61 60 51 74 76 63 51 49 11 185 45 2810 13 61 61 581 467 647 64 54 49 7.9 5.5 5.2 715 14 61 58 473 88 68 65 74 48 7.2 874 4.9 829 15 62 55 83 67 63 66 75 47 8.4 227 192 943 16 62 55 466 73 68 65 60 43 7.8 5.7 6.8 489 17 808 70 52 505 249 64 60 45 7.5 114 478 831 18 3940 369 254 79 78 64 152 46 7.2 6.6 7.9 6.0 19 588 55 698 78 76 63 76 49 7.2 318 353 1420 20 332 55 689 75 76 62 60 51 7.7 5.6 371 64 21 64 56 761 77 78 62 87 51 17 5.4 5.7 374 22 61 54 767 97 77 62 60 50 8.6 228 213 24 23 66 56 68 113 76 61 58 51 7.6 5.9 827 555 24 89 14100 638 119 74 64 58 49 7.7 135 9750 6.6 25 574 2870 351 513 74 66 56 47 20 83 4600 213 26 63 4110 86 77 173 62 55 45 103 112 421 7.9 27 64 51200 631 73 855 62 54 48 163 7.8 406 418 28 63 6140 63 73 76 58 54 48 8.2 56 449 5.4 29 64 1290 495 78 87 63 52 44 179 200 19 5.2 30 67 116 74 75 --- 62 53 43 149 183 517 5.2 31 67 --- 905 82 61 --- 41 --- 169 550 --- TOTAL 7894 81972 80704 8863 4792 2247 1843 1515 1160.0 10502.2 22254.6 14937.0 MEAN 255 2732 2603 286 165 72.5 61.4 48.9 38.7 339 718 498 MAX 3940 51200 40000 1500 855 342 152 88 179 4420 9750 2810 MIN 61 54 18 44 53 58 42 41 7.2 5.4 4.9 5.2 AC-FT 15660 162600 160100 17580 9500 4460 3660 3010 2300 20830 44140 29630 CFSM 1.22 13.1 12.5 1.37 .79 .35 .29 .23 .19 1.62 3.43 2.38 IN. 1.41 14.59 14.36 1.58 .85 .40 .33 .27 .21 1.87 3.96 2.66 CAL YR 1987 TOTAL 219713.0 MEAN 602 MAX 51200 MIN 4.9 AC-FT 435800 CFSM 2.88 IN. 39.11 WTR YR 1988 TOTAL 238683.8 MEAN 652 MAX 51200 MIN 4.9 AC-FT 473400 CFSM 3.12 IN. 42.48 e Estimated 276 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 mil (552 kml. PERIOD OF RECORD.--Water years 1981 to current year. REMARKS: Flow controlled by Lago Loiza reservoir. WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 DIS- OXYGEN, OXYGEN COL1- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1987 21... 1040 42 188 7.60 28.0 80 5.0 64 70 3400 K6000 DEC 18... 0940 E5.3 215 6.90 25.0 1 6.4 77 <10 34000 K76000 FEB 1988 29... 0845 95 290 7.60 25.0 1.5 6.3 75 16 K110 K50 APR 22... 1150 72 322 7.80 27.0 160 6.5 81 ,10 17000 K15000 JUN 06... 1150 44 343 7.70 31.0 11 8.5 114 35 460 K150 AUG 29... 1150 16 180 7.30 28.0 110 4.5 57 <10 2000 K1500 HARD- AAA- HARD- NESS MAGNE- SODIUM POTAS- UNITY CHLO- NESS NONCARB CALCIUM S1UM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CACO2 AS S) AS SO4) AS CL) OCT 1987 21... 61 5 15 5.8 15 0.8 3.5 56 <0.5 12 13 DEC 16... 62 FEB 1988 29... 100 APR 22... 110 0 26 10 22 1 2.2 110 <0.5 18 20 JUN 06... 110 AUG 29... 63 9 15 6.1 15 0.9 2.8 54 16 11 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/i (MG/i AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1987 21... 0.10 19 120 14 26 0.92 0.08 1.00 0.10 0.50 DEC 16... 4 0.99 0.01 1.00 0.12 1.10 FEB 1988 29... <1 0.66 0.04 0.70 0.59 0.80 APR 22... 0.20 21 180 35 239 0.90 0.10 1.00 0.21 0.29 JUN 06... 18 0.87 0.13 1.00 1.00 0.90 AUG 29... 0.20 17 115 5.1 60 0.91 0.09 1.00 0.25 0.45 K = non-ideal count E = estimate RIO GRANDE DE LOIZA BASIN 50059100 RIO GRANDE DE LOIZA BELOW TRUJILLO ALTO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1981 21... 0.6 1.6 4.8 0.20 1 <100 30 <1 <1 20 DEC 16... 1.2 2.1 5.8 0.25 FEB 1988 29... 1.4 2.1 4.4 0.18 - APR 22... 0.5 1.5 6.6 0.20 1 <100 <10 <1 10 30 JUN 06... 1.9 2.9 13 0.36 AUG 29... 0.7 1.7 7.5 0.30 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 1987 21... 4500 21 120 <0.10 <I 1 10 <0.010 5 0.03 DEC 16... FEB 1988 29... APR 22... 14000 <5 390 <0.10 <1 1 30 ,0.010 <1 0.03 JUN 06... AUG 29... 277 I I 278 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 i 2 (25.48 km 2 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--March 1967 to current year. GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 225 ft (68 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. AVERAGE DISCHARGE.--21 years (1968-88), 28.9 ft'/s (0.818 m'/s), 39.88 in/yr (1,013 mm/yr), 20,940 acre-ft/yr (25.8 hmYyr); median of yearly mean discharges, 28 ft'/s (0.79 m'/s), 20,300 acre-ft/yr (25 hoO/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 15,000 ft'/s (425 m'/s), Sept. 13, 1982, gage height, 13.1 ft (3.99 m), from floodmarks, from rating curve extended above 350 ft'/s (9.91 mi/s) on basis of slope-area measurements and step- backwater analysis made in 1981; minimum daily discharge, 0.80 ft'/s (0.023 10/s). July 24. 1977. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 2,500 ft'/s (70.8 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (W/s) (m 3/s) (ft) (m) Date Time (W/s) (80/s) (ft) (m) Nov. 27 0315 *12,500 354 *12.48 3.804 Aug. 24 unknown 4,910 139 8.40 2.560 Dec. 7 2000 8,920 253 10.94 3.335 Sept.11 1200 4,870 138 8.37 2.551 Minimum discharge, 3.8 ft'/s (0.108 m'/s). June 11. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 22 6.6 62 464 179 17 e10 6.5 7.5 48 7.8 12 2 11 6.3 58 142 132 19 e9.4 6.5 6.9 87 6.2 11 3 9.0 6.3 53 80 167 17 e9.0 6.5 6.5 26 6.1 11 4 18 9.0 49 66 75 15 e8.8 5.6 6.4 15 11 10 5 17 9.6 56 57 56 15 e8.5 5.7 6.1 11 6.9 9.7 6 9.8 19 59 53 48 14 14 17 5.5 10 5.1 9.5 7 7.8 11 965 49 42 14 10 32 5.2 25 4.5 11 8 7.7 11 590 46 39 14 8.8 10 4.9 13 4.8 14 9 7.5 13 87 46 45 e13 8.3 32 5.0 9.4 5.9 45 10 6.0 13 65 43 42 e13 7.7 244 4.5 9.0 46 72 11 6.1 12 54 42 35 e12 7.5 49 4.4 8.5 30 518 12 6.0 12 46 40 34 e12 8.2 19 5.1 9.4 23 86 13 5.5 12 41 37 34 ell 7.3 15 4.7 8.3 e13 58 14 6.9 11 36 35 35 ell 7.3 18 5.3 80 e10 74 15 17 11 37 32 34 e10 15 28 41 13 e7.5 46 16 47 11 33 32 32 e10 13 17 20 7.9 e7.2 34 17 97 28 30 44 29 el0 8.1 14 11 6.5 e15 28 18 182 77 29 37 29 e9.6 9.6 13 7.7 9.7 ell 25 19 49 30 78 40 27 e9.6 11 14 6.9 10 e8.0 31 20 17 28 147 32 26 e9.2 7.4 13 13 8.0 e7.0 27 21 12 15 82 29 25 e9.2 6.5 13 17 6.0 e6.2 23 22 9.8 14 51 27 24 ell 6.2 12 13 15 e7.0 29 23 8.9 42 40 27 26 e10 22 9.7 8.8 11 e20 25 24 33 453 49 26 28 e9.6 9.0 8.9 15 13 e500 20 25 27 101 41 33 24 e10 8.6 8.9 22 17 e300 19 26 13 61 68 27 37 ell 9.6 8.4 23 8.5 e28 19 27 10 1790 54 25 59 e13 8.3 6.2 14 7.8 e25 18 28 9.2 208 47 26 22 e14 8.1 6.3 9.9 10 e24 17 29 9.5 94 37 38 19 e13 7.9 6.7 25 16 e19 16 30 7.9 72 33 31 --- e12 7.2 8.6 17 14 15 17 31 7.3 --- 215 135 ell --- 11 --- 9.5 13 --- TOTAL 696.9 3186.8 3292 1841 1404 379.2 282.3 665.5 342.3 542.5 1193.2 1335.2 MEAN 22.5 106 106 59.4 48.4 12.2 9.41 21.5 11.4 17.5 38.5 44.5 MAX 182 1790 965 464 179 19 22 244 41 87 500 518 MIN 5.5 6.3 29 25 19 9.2 6.2 5.6 4.4 6.0 4.5 9.5 AC-FT 1380 6320 6530 3650 2780 752 560 1320 679 1080 2370 -650 CFSM 2.28 10.8 10.8 6.04 4.92 1.24 .96 2.18 1.16 1.78 3.91 4.52 1N. 2.63 12.05 12.45 6.96 5.31 1.43 1.07 2.52 1.29 2.05 4.51 5.05 CAL YR 1987 TOTAL 13481.9 MEAN 36.9 MAX 1790 MIN 3.7 AC-FT 26740 CFSM 3.75 IN. 50.97 WTR YR 1988 TOTAL 15160.9 MEAN 41.4 MAX 1790 MIN 4.4 AC-FT 30070 CFSM 4.21 IN. 57.32 e Estimated 279 RIO GRANDE DE IOIZA 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 1987 TO SEPTEMBER 1988 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA­ DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURE (CFS) (UMHOS) (DEG C) (CfS) (UMHOS) (DEG C) OCT, 13 1545 5.29 228 29.5 MAR, 02 1231 19.2 257 24.0 DEC, 10 1718 65.5 151 24.5 APR, 04 1620 9.13 233 25.0 JAN, 08 1049 46.8 189 22.0 JUL, 06 1605 10.1 216 29.5 FEB, 05 1048 53.8 170 21.5 280 THIS PAGE WAS LEFT BLANK INTENTIONALLY 281 OCEANO ArLANrico (a Coastal basin UQUILL0 Rib Grande de Loizo basin Drainage boundary LAS PIEDRAS a Rth Humacao basin HUMACAO Coosfolbosin Map area AN JUAN EXPLANATION A0670 SURFACE—WATER STATION AND NUMBER V0725 OUAUTY—OF—WATER STATION AND NUMBER I 2 0 4WLES 2 3 ()METERS Figure 19.--Northeastern river basins--Rio Herrera to Rio Anton Ruiz basins. 282 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 Highly 186, and about 1.2 mi (1.9 km) south of El Verde. DRAINAGE AREA.--1.01 mi' (2.62 km 2 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--March 1983 to current year. GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 1,230 ft (375 m), from topographic map. REMARKS.--Records poor. AVERAGE DISCHARGE.--5 years (1984-88), 7.72 ft'/s (0.219 m'/s), 105.90 in/yr (2,690 mm/yr), 5,590 acre-ft/yr (689 hm)/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 2,230 ft'is (63.2 m'/s), Dec. 7, 1987, gage height, 9.42 ft (2.871 m) from rating curve extended above 20 ft'is (0.57 m'/s) on basis of step-backwater analysis; minimum discharge, 0.20 ft'/s (0.006 mi/s), July 14, 15, 1985. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 500 ft'/s (14.2 m7s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (m'/s) (ft) (m) Date Time (W/s) (m)/s) (ft) (m) Nov.27 0300 635 18.0 7.39 2.252 Dec. 7 2030 *2,230 63.2 *9.42 2.871 Aug.10 1815 781 22.1 7.68 2.341 Aug.24 1230 871 24.7 7.84 2.390 Minimum discharge, 0.45 ft'/s (0.013 m 3/s), June 8. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 5.5 2.0 2.1 72 56 2.8 2.9 2.3 1.1 7.1 5.6 3.1 2 2.7 1.7 1.5 24 43 2.7 2.3 1.6 1.1 34 4.1 2.5 3 7.7 1.5 2.0 9.7 41 2.4 2.0 1.3 .89 3.3 29 2.3 4 6.9 1.5 1.3 11 13 2.2 2.6 1.2 .71 2.1 8.8 1.9 5 3.5 2.3 .80 7.5 7.7 2.1 2.0 1.1 .66 1.7 4.0 1.6 6 2.1 18 4.8 8.4 6.2 2.0 2.1 1.4 .57 12 3.3 1.6 1.5 .49 11 11 7.5 7 1.7 4.0 216 8.2 6.0 1.9 1.7 8 1.7 2.1 83 8.1 5.0 1.9 1.6 1.1 .48 2.6 4.5 10 9 1.7 1.8 8.6 7.9 7.0 1.7 1.3 1.2 .51 2.0 3.9 35 10 1.4 1.7 5.8 5.9 4.5 1.6 1.1 43 .69 2.2 61 17 4.7 34 45 11 1.4 1.5 6.1 13 4.5 1.5 .90 14 .64 12 1.0 1.4 4.5 5.9 12 1.3 .80 2.8 1.6 5.3 8.2 30 13 .72 1.5 3.3 6.2 8.3 1.3 .69 2.7 1.3 8.9 4.6 33 14 1.4 2.4 2.7 5.2 5.1 1.2 .59 8.2 7.4 24 4.0 16 15 8.4 1.6 21 3.9 17 .99 2.3 22 20 3.1 4.0 18 16 18 1.5 6.4 3.6 6.0 .95 9.4 4.3 2.9 2.5 14 7.1 17 19 27 3.3 15 4.5 .89 1.7 3.1 1.7 2.3 25 4.5 18 10 22 2.7 6.3 8.4 3.9 1.3 1.1 2.7 15 5.4 3.6 19 5.4 10 46 8.0 5.8 .87 5.1 2.3 1.9 12 3.7 9.7 4.4 20 3.1 5.0 65 4.3 8.4 3.5 1.8 3.7 5.1 3.7 3.3 21 3.3 3.1 35 3.6 4.1 1.7 1.2 4.8 17 2.8 3.0 3.1 22 3.2 2.7 15 3.3 3.6 1.4 1.2 2.2 4.4 15 17 2.8 23 2.2 30 7.5 3.2 6.8 .99 .89 2.2 3.3 5.4 8.8 2.8 24 10 67 12 4.0 18 9.4 .70 1.8 2.8 5.1 110 2.6 25 5.9 35 8.9 8.4 6.1 22 9.8 1.5 3.9 4.5 25 2.3 1.4 3.3 9.5 6.4 2.0 26 5.5 40 23 3.5 9.6 7.6 30 27 2.9 145 10 3.5 24 22 5.1 1.3 2.0 3.9 16 1.7 28 3.3 29 18 5.6 3.7 19 2.4 3.0 1.9 9.8 7.1 1.5 20 4.6 1.3 29 2.9 6.6 9.0 13 3.1 25 2.1 1.8 4.9 1.2 30 2.2 3.6 6.7 7.5 --- 15 2.9 1.9 2.4 25 6.5 31 2.1 --- 37 44 5.0 --- 1.6 --- 5.1 3.8 --- 275.1 MEAN 4.74 15.7 21.6 10.8 12.0 5.29 3.44 4.68 3.23 14.5 TOTAL 146.82 472.5 669.00 333.7 348.4 163.99 103.07 145.0 96.94 265.6 449.6 8.57 9.17 MAX 19 145 216 72 56 25 30 43 20 34 110 45 MIN .72 1.4 .80 3.2 3.1 .87 .59 1.1 .48 1.7 3.0 1.2 AC-FT 291 937 1330 662 691 325 204 288 192 527 892 546 CFSM 4.55 15.1 20.8 10.4 11.6 5.09 3.30 4.50 3.11 8.24 13.9 8.82 IN. 5.25 16.90 23.93 11.94 12.46 5.87 3.69 5.19 3.41 16.08 9.50 9.84 CAL YR 1987 TOTAL 3366.61 MEAN 9.22 MAX 216 MIN .72 AC-FT 6680 CFSM 8.87 IN. 120.42 WTR YR 1988 TOTAL 3469.72 MEAN 9.48 MAX 216 MIN .48 AC-FT 6880 CFSM 9.12 IN. 124.11 RIO ESPIRITU SANTO BASIN 283 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 1987 TO SEPTEMBER 1988 DATE TIME STREAMFLOW, INSTANTANEOUS (CFS) SPECIFIC CON- DUCTANCE (UMHOS) TEMPERA- TURF (DEG C) DATE TIME STREAMFLOW, INSTANTANEOUS (CFS) SPECIFIC CON- DUCTANCE (UMHOS) TEMPERA- TURE (DEG C) OCT, 05 1206 DEC, 10 1045 JAN, 07 1213 FEB, 08 1351 3.34 5.88 5.69 4.95 485 60 63 62 23.0 21.5 20.5 20.0 MAR, 03 1231 APR, 07 0931 JUL, 07 1322 2.24 1.79 7.18 99 58 47 20.0 20.0 22.5 284 RIO ESPIRITU SANTO BASIN 50063500 QUEBRADA TORONJA AT EL VERDE, PR LOCATION.--Lat 18°19'43", long 65'49'14". Hydrologic Unit 21010005, in Caribbean National Forest, at downstream side of culvert on Highway 186, 0.2 mi (0.3 km) upstream from Rio Espiritu Santo, and about 0.9 mi (1.4 km) south of El Verde. DRAINAGE AREA.--0.064 Ili' (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.--Records fair. AVERAGE DISCHARGE.--5 years (1984-88), 0.35 ft'is (0.010 m'/s), 74.26 in/yr (1,886 mm/yr), 254 acre-ft/yr (0.313hm'/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 33 ft3/s (0.93 m'/s), Mar. 15, 1987, gage height, 1.94 ft (0.591 m), from rating curve extended above 1.0 ft3/s (0.03 mi/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'is (0.37 110/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (m7s) (ft) (m) Date Time (ft'/s) (m'/s) (ft) (m) Nov. 27 0745 18 0.51 1.71 0.521 Aug. 10 1815 15 0.42 1.67 0.509 Dec. 7 2115 *22 0.62 *1.78 0.542 Minimum discharge, 0.04 ft'/s (0.001 mi/s), June 27, 28, 30. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 .23 .09 .79 3.6 1.7 .15 .20 .11 .09 .29 .12 .30 2 .13 .10 .67 1.7 1.4 .14 .16 .09 .09 .93 .10 .26 3 .23 .08 .63 1.2 1.9 .13 .15 .79 .09 .11 .55 .22 4 .19 .10 .58 .98 .78 .12 .16 .08 .08 .07 .28 .22 5 .13 .11 .55 .82 .56 .12 .13 .06 .08 .06 .14 .22 6 .08 .62 .63 .74 .49 .11 .12 .07 .08 .44 .12 .22 7 .08 .12 5.3 .64 .41 .10 .12 .07 .08 .36 .19 .38 8 .07 .09 5.6 .57 .31 .09 .12 .06 .07 .10 .12 .43 9 .07 .09 2.3 .56 .30 .09 .12 .10 .07 .09 .11 1.1 10 .07 .08 1.5 .54 .24 .09 .11 .85 .08 .08 1.5 .63 11 .06 .08 1.1 .66 .32 .09 .11 .48 .08 .13 1.1 1.8 12 .05 .08 .83 .41 .37 .08 .11 .13 .10 .13 .47 1.5 13 .05 .12 .71 .42 .28 .08 .10 .16 .08 .20 .26 1.5 1.1 14 .06 .13 .63 .36 .20 .08 .09 .27 .20 .62 .25 15 .12 .08 .96 .30 .34 .07 .23 .48 .56 .12 .22 1.4 .22 .31 16 .66 .08 .60 .29 .20 .07 .93 .12 .09 .89 17 .54 .45 .50 .40 .19 .07 .14 .16 .08 .09 .79 .62 18 .32 .53 .46 .35 .27 .07 .34 .13 .07 .20 .25 .52 19 .18 .38 1.9 .33 .23 .07 .19 .12 .08 .29 .20 .54 20 .13 .23 3.1 .26 .25 .09 .13 .15 .09 .11 .18 .37 21 .11 .16 2.2 .20 .18 .07 .11 .12 .32 .08 .17 .29 22 .11 .15 1.3 .18 .17 .07 .10 .10 .13 .23 .34 .27 23 .09 1.2 .89 .18 .20 .07 .09 .11 .07 .12 .41 .25 24 .77 3.7 .89 .19 .36 .18 .09 .09 .06 .16 2.9 .22 25 .37 2.4 .70 .26 .20 .20 .25 .09 .06 .11 1.9 .21 26 .20 2.7 1.5 .17 .22 .17 .64 .08 .06 .20 .68 .20 27 .13 6.9 .75 .16 .43 .46 .26 .10 .05 .10 .97 .18 28 .15 3.0 .79 .28 .17 .59 .14 .13 .05 .14 .59 .17 29 .13 1.6 .59 .23 .15 1.7 .11 .09 .07 .43 .42 .15 30 .12 1.0 .50 .16 --- .42 .11 .09 .05 .47 .66 .14 .15 .35 --- TOTAL 5.74 26.45 41.65 18.03 12.82 6.10 5.66 4.97 3.19 6.70 16.65 16.30 MEAN .19 .88 1.34 .58 .44 .20 .19 .16 .11 31 .11 --- 2.2 .89 .26 --- .09 --- .22 .54 .54 MAX .77 6.9 5.6 3.6 1.9 .93 .85 .56 2.9 1.8 1.7 .93 MIN .05 .08 .46 .16 .15 .07 .09 .05 .06 .06 .10 .14 AC-FT 11 52 83 36 25 12 11 9.9 6.3 13 33 32 CFSM .97 4.64 7.07 3.06 2.33 1.04 .99 .84 .56 1.14 2.83 2.86 IN. 1.12 5.18 8.15 3.53 2.51 1.19 1.11 .97 .62 1.31 3.26 3.19 CAL YR 1987 TOTAL 156.91 MEAN 43 MAX 6.9 MIN 04 AC-FT 311 CFSM 2.26 IN. 30.72 WTR YR 1988 TOTAL 164.26 MEAN 45 MAX 6.9 MIN 05 AC-FT 326 CFSM 2.36 IN. 32.16 RIO ESPIRITU SANTO BASIN 285 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 1987 TO SEPTEMBER 1988 DATE TIME STREAMFLOW, INSTANTANEOUS (CFS) SPECIFIC CON- DUCTANCE (UMHOS) TEMPERA- TURE (DEG C) DATE TIME STREAMFLOW, INSTANTANEOUS (CFS) SPECIFIC CON- DUCTANCE (UMHOS) TEMPERA- TURE (DEG C) OCT, 05 1506 DEC, 10 1325 JAN, 07 0907 FEB, 03 1219 0.13 1.26 0.67 1.33 107 81 104 89 23.5 23.0 21.5 21.0 MAR, 03 1401 APR, 07 1122 JUL. 07 1531 0.13 0.11 0.17 158 115 94 21.0 21.5 23.5 I 286 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 mi' (22.33 km 2 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--February 1959 to April 1963 (annual low-flow and occasional measurements only), August 1966 to current year. GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 40 ft (12 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharge, which are poor. AVERAGE DISCHARGE.--22 years (1967-88), 58.1 ft'/s (1.662 m'/s), 92.48 in/yr (2.349 mm/yr), 42,530 acre-ft/yr (52.4 hm'/yr); median of yearly mean discharges, 53.4 ftYs (1.51 m'/s), 38,700 acre-ft/yr (48 hmYyr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 20,000 ftVs (566 m'/s), Dec. 7, 1987, gage height, 14.52 ft (4.426 ), from rating curve extended above 600 ft-is (17.0 m 3/s) on basis of step-backwater analysis; minimum discharge, 4.0 fO/s (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) (m'/s) (ft) (m) Date Time (ft'/s) (10/s) (ft) (m) Nov. 24 1600 3,730 106 7.77 2.368 July 14 0100 3,040 86.1 7.23 2.204 Nov. 25 2200 3,350 94.6 7.48 2.280 Aug. 10 1900 6,210 178 9.36 2.853 Nov. 27 unknown 9,330 264 10.82 3.298 Aug. 24 1315 3,330 94.3 7.47 2.277 Dec. 7 unknown *20,000 566 *14.52 4.426 Sept.11 1230 3,650 103 7.71 2.350 Minimum discharge, 7.7 ft'/s (0.218 m'/s), Nov. 13. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 53 11 43 e200 468 29 30 22 13 e100 37 38 2 27 10 e38 e70 319 28 25 17 12 e25 27 32 3 59 9.1 e40 e52 345 25 23 15 12 e18 171 29 4 57 9.7 e44 e45 115 24 24 14 12 e14 100 27 5 36 13 e60 e42 71 23 23 14 12 e13 32 24 6 25 108 e250 e38 53 23 23 20 11 e30 25 23 7 21 ell e2600 e40 54 22 20 25 11 e21 55 43 8 20 e10 e200 64 42 21 19 16 11 18 43 62 9 26 e13 e70 73 51 20 18 79 11 12 27 257 10 22 e12 e58 57 37 20 17 313 11 13 495 149 11 28 e10 e48 87 40 19 16 91 12 23 283 440 12 22 e9.4 e43 56 68 18 16 22 15 32 94 243 13 19 9.8 e38 54 78 16 15 19 e25 18 40 255 14 23 11 e35 45 45 17 14 50 e41 223 33 134 15 73 10 e37 35 87 16 77 126 e30 15 30 172 16 138 9.2 e31 32 51 16 276 37 e15 12 57 91 17 145 136 e29 84 35 15 25 20 e13 14 188 54 18 60 125 e60 43 57 17 60 18 .12 71 52 45 19 32 62 ell° 61 43 15 52 18 ell 98 31 84 20 17 26 el50 34 55 31 23 29 e25 35 27 48 21 14 15 e60 29 32 19 18 31 e17 27 24 33 22 17 13 e40 26 28 16 18 17 e12 90 101 30 23 14 244 e50 25 31 14 17 19 e15 53 64 30 24 104 846 e41 27 106 47 16 28 e21 29 983 27 25 45 396 e68 54 44 162 54 21 e35 41 302 24 26 26 364 e50 28 36 80 167 15 e17 66 71 23 27 16 e1700 e38 28 172 106 66 14 e14 31 146 22 28 16 el50 e34 42 39 138 24 19 e30 47 85 21 29 15 e60 e33 88 31 281 23 17 e20 122 56 20 30 12 e50 e100 51 --- 94 23 17 e40 145 79 19 31 12 --- e470 299 53 --- 17 --- 36 42 --- TOTAL 1194 4453.2 4968 1909 2633 1425 1222 1180 536 1492 3800 2499 MEAN 38.5 148 160 61.6 90.8 46.0 40.7 38.1 17.9 48.1 123 83.3 MAX 145 1700 2600 299 468 281 276 313 41 223 983 440 MIN 12 9.1 29 25 28 14 14 14 11 12 24 19 AC-FT 2370 8830 9850 3790 5220 2830 2420 2340 1060 2960 7540 4960 CFSM 4.47 17.2 18.6 7.14 10.5 5.33 4.73 4.42 2.07 5.58 14.2 9.66 IN. 5.15 19.22 21.44 8.24 11.36 6.15 5.27 5.09 2.31 6.44 16.40 10.78 CAL YR 1987 TOTAL 27848.0 MEAN 76.3 MAX 2600 MIN 8.0 AC-FT 55240 CFSM 8.85 IN. 120.18 WTR YR 1988 TOTAL 27311.2 MEAN 74.6 MAX 2600 MIN 9.1 AC-FT 54170 CFSM 8.66 IN. 117.86 e Estimated 287 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 1987 TO SEPTEMBER 1988 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1987 06... 0915 25 81 7.20 25.0 1.6 9.1 109 20 K600 K1400 DEC 02... 0855 39 83 6.50 23.0 1.9 8.4 97 15 K1700 K2300 FEB 1988 11... 0930 34 94 6.30 22.0 2.1 9.0 103 15 2400 380 APR 05... 0845 23 94 7.90 26.0 1.1 8.8 101 110 K770 880 JUN 01... 0915 13 112 7.50 24.0 1.0 8.2 100 17 590 K1000 AUG 09... 0845 24 90 6.20 27.0 1.8 7.6 95 <10 460 7100 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SLUM, SODIUM, AD- S1UM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLO 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 1987 06... 25 0 5.5 2.8 6.3 0.6 0.70 25 <0.5 3.8 7.8 DEC 02... - 26 FEB 1988 11... 34 APR 05... 30 0 6.4 3.5 7.7 0.6 0.50 31 <0.5 3.5 10 JUN 01... 36 AUG 09... 31 3 6.9 3.4 7.6 0.6 0.50 21 3.7 9.4 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C. NITRATE NITRITE N020403 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 1987 06... 0.10 15 57 3.9 1 <0.01 <0.10 0.02 0.28 DEC 02... -- <1 -0.01 <0.10 <0.01 0.49 FEB 1988 11... 2 0.08 <0.10 0.02 0.18 APR 05... 0.10 18 68 4.3 <1 <0.01 <0.10 0.01 0.36 JUN 01... 4 <0.01 <0.10 0.03 0.51 AUG 09... 0.10 15 63 4.1 3 <0.01 <0.10 0.03 0.67 K = non-ideal count RIO ESPIRITU SANTO BASIN 50063800 RIO ESPIRITU SANTO NEAR RIO GRANDE, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1987 06... 0.3 0.01 -1 <100 <10 1 3 10 DEC 02... 0.5 0.01 FEB 1988 11... 0.2 0.02 APR 05... <0.2 0.01 <1 <100 <10 1 <1 <10 JUN 01... <0.2 0.02 AUG 09... 0.7 0.02 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 1987 06... 150 <5 <10 <0.10 <1 <1 <10 <0.010 3 0.01 DEC 02... - FEB 1988 11... - APR 05... 90 <5 10 <0.10 <1 <1 <10 <0.010 4 0.01 JUN 01... - AUG 09... - 288 I I I I 289 RIO MAMEYES BASIN 50065500 RIO MAMEYES NEAR SABANA, PR LOCATION.--Lat 18°19'46", long 65°45'04", Hydrologic Unit 21010005, on left bank, at bridge on Highway 988, 1.4 mi (2.3 km) west of Sabana, 2.0 i (3.2 km) downstream from Rio de la Mina, and 3.2 mi (5.1 km) southeast of Mameyes. DRAINAGE AREA.--6.88 mi' (17.82 km'). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--August 1967 to December 1973. June 1983 to current year. GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 275 ft (84 ), from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. AVERAGE DISCHARGE.--11 years (1968-73, 1984-88), 58.5 ft 3 /s (1.657 m'/s), 115.47 in/yr (2,933 mm/yr), 42,380 acre-ft/yr (52.3 he/yr): median of yearly mean discharges, 59 ft'is (1.67 m'/s), 42,700 acre-ft/yr (53 hoe/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 19,800 ft'is (561 m'/s), Sept. 4, 1973, gage height, 13.02 ft (3.968 ), from rating curve extended above 1,800 ft-7s (51.0 '/s) on basis of slope-area measurement of peak flow; minimum discharge, 5.1 ft'/s (0.144 m'/s), Apr. 8, 9, 1970. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 4,000 ft'/s (113 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (W/s) (mi/s) (ft) (m) Date Time (ft'/s) (m'/s) (ft) (m) Nov. 25 2100 4,090 116 7.48 2.280 Dec. 7 2030 *13,000 368 *11.16 3.402 Nov. 27 0715 9,750 276 10.08 3.072 Aug.24 1245 7,020 199 8.99 2.740 Minimum daily discharge, 12 ft'is (0.340 40/s), Mar. 22, 23. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 e96 28 50 302 225 29 29 25 22 85 35 29 2 e50 26 61 141 173 41 25 19 20 113 33 25 3 e32 18 53 77 181 26 24 17 20 23 135 26 4 e88 24 41 74 73 24 29 15 20 26 77 22 5 e50 31 35 62 46 23 70 15 20 24 39 29 6 e40 97 54 78 40 26 51 18 19 118 33 39 7 e33 26 1090 60 43 25 25 16 18 106 52 68 8 e29 18 786 58 35 25 23 16 18 29 31 80 9 e28 18 84 68 45 23 21 15 18 22 27 207 10 e51 17 60 50 32 22 19 260 19 20 242 121 11 e32 15 74 84 33 20 17 53 40 49 94 245 12 e60 16 44 56 62 19 16 26 48 56 38 153 13 e34 19 39 67 111 19 15 29 25 48 24 260 14 e25 31 36 53 45 18 15 79 47 193 22 134 15 e27 24 81 40 99 17 50 210 151 30 24 94 16 75 46 44 35 54 16 45 52 38 23 52 89 17 127 107 31 68 40 16 17 52 24 20 131 58 18 99 105 25 41 57 16 48 32 18 75 25 55 19 45 59 251 53 41 15 48 42 48 73 20 96 20 28 38 297 34 54 43 20 40 26 29 17 55 47 22 39 25 84 28 29 12 14 27 82 88 80 50 23 29 214 65 25 39 12 14 27 89 42 33 56 24 66 464 66 26 76 47 14 23 17 31 731 21 88 28 193 30 32 13 15 62 132 22 14 42 25 43 509 57 31 41 38 22 27 185 36 82 61 26 43 347 120 23 57 23 144 22 29 103 74 e33 27 25 1660 73 33 138 25 53 25 14 31 78 e29 28 31 293 100 36 39 32 27 30 17 51 58 e42 29 27 88 59 71 32 148 23 36 68 132 39 e33 30 21 62 45 36 --- 81 34 84 46 103 47 e24 31 29 --- 112 121 44 --- 42 --- 32 34 -- TOTAL 1490 4453 4210 1961 1972 982 983 1431 1180 1858 2524 2277 MEAN 48.1 148 136 63.3 68.0 31.7 32.8 46.2 39.3 59.9 81.4 75.9 MAX 127 1660 1090 302 225 148 144 260 151 193 731 260 12 20 14 22 AC-FT 2960 8830 8350 3890 3910 1950 1950 2840 2340 3690 5010 4520 CFSM 6.99 21.6 19.7 9.19 9.88 4.60 4.76 6.71 5.72 8.71 11.8 11.0 IN. 8.06 24.08 22.76 10.60 10.66 5.31 5.32 7.74 6.38 10.05 13.65 12.31 MIN 21 15 25 23 29 14 15 14 CAL YR 1987 TOTAL 23602.5 MEAN 64.7 MAX 1660 MIN 9.6 AC-FT 46820 CFSM 9.40 IN. 127.62 WTR YR 1988 TOTAL 25321 MEAN 69.2 MAX 1660 MIN 12 AC-FT 50220 CFSM 10.1 IN. 136.91 e Estimated 290 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 1987 TO SEPTEMBER 1988 BATE TIME STREAMFLOW, INSTANTANEOUS (CFS) SPECIFIC CON- DUCTANCE (UMHOS) TEMPERA- TURF (DEG C) DATE TIME STREAMFLOW, INSTANTANEOUS (CFS) SPECIFIC CON- DUCTANCE (UMHOS) TEMPERA- TURF 'DEG C) OCT, 16 1016 DEC, 11 1126 JAN, 05 0946 FEB, 04 1041 32.4 92.8 61.2 75 80 70 102 88 24.5 23.5 22.0 21.5 MAR, 02 1017 APR, 06 0956 JUL, 06 1315 82.7 47.9 67.0 119 78 69 20.5 21.5 28.0 291 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 km 2 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--October 1979 to current year. GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 260 ft (80 m), from topographic map. REMARKS.--Records fair. AVERAGE DISCHARGE.--9 years (1980-88). 20.1 ft'/s (0.569 m'/s), 68.93 in/yr (1,751 mm/ -). 14,560 acre-ft/yr (18.0 he/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 9,010 ft'is (255 m'/s), Apr. 21, 1983. gage height. 19.35 ft (5.898 m), from floodmark, from rating curve extended above 200 fO/s (5.66 m'/s) on basis of step-backwater analysis and slope-area measurement; minimum discharge, 0.86 ft'is (0.024 m'/s). Apr. 17, 1983. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,500 ft'/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) Nov. 23 2330 1,870 53.0 12.71 3.874 Dec. 7 2400 1,830 51.8 12.65 3.856 Nov. 27 0700 *3,940 112 *15.23 4.642 Aug. 24 1245 2,150 60.9 13.11 3.996 Minimum discharge, 2.2 ft'/s (0.062 m'/s), Apr. 14, 15. DISCHARGE, CUBIC FEET PER SECOND. WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 5.6 4.2 32 80 81 7.2 3.9 5.2 8.3 54 7.0 10 2 2.8 4.9 46 45 47 8.2 3.4 3.7 6.6 46 6.1 8.6 3 180 3.7 27 20 76 6.7 3.2 3.2 5.9 13 24 9.7 4 13 8.1 18 17 16 6.3 3.4 6.9 5.4 10 16 7.7 5 5.0 8.5 14 17 10 5.9 52 20 5.3 9.0 6.6 6.9 6 3.9 24 19 24 8.7 5.8 21 4.1 4.9 14 5.8 7.2 7 4.1 4.8 309 15 8.0 5.5 4.6 3.5 4.7 24 7.7 13 8 3.4 3.8 426 13 8.0 5.5 3.5 2.9 4.4 8.9 5.4 22 9 4.4 3.9 49 16 8.1 5.0 3.2 2.9 4.3 7.6 5.2 136 10 4.9 4.0 33 13 7.1 5.0 3.0 193 4.0 7.3 124 38 11 4.0 3.4 31 21 8.4 4.8 2.9 57 4.2 12 31 118 12 3.4 3.1 22 15 20 4.6 2.7 13 5.7 8.1 8.6 31 13 4.3 2.9 18 21 86 4.8 2.6 11 4.0 19 6.6 105 14 9.5 4.6 15 14 16 4.5 2.4 12 4.7 81 6.5 72 15 16 3.4 24 11 29 4.5 90 121 68 8.4 8.7 37 16 57 5.7 14 10 15 4.2 23 26 14 7.0 14 38 17 93 14 12 22 10 4.2 12 51 5.7 6.4 79 191 18 89 19 10 11 17 4.0 46 29 4.1 16 9.1 15 19 19 5.8 53 14 13 3.7 11 20 17 25 7.6 17 20 8.7 4.0 115 9 7 17 8.1 5.8 12 16 9.0 5.9 13 21 6.8 3.3 83 8.5 9.3 4.1 4.8 9.6 103 7.0 5.2 17 22 5.7 3.0 22 7.9 8.1 3.6 3.8 7.7 107 22 27 131 23 5.3 177 15 7.5 12 3.3 3.5 8.6 142 14 9.9 26 24 8.6 340 15 7.5 15 9.5 3.5 6.8 36 8.1 376 12 1 25 6.5 283 12 7.6 11 34 4.6 6.2 14 11 103 10 1 26 7.6 206 26 8.6 14 11 15 5.5 14 19 25 9.7 27 5.3 807 17 9.7 56 4.6 9.8 6.3 12 8.7 30 89 28 4.6 309 31 8.7 10 4.8 13 7.8 10 7.8 16 97 29 4.9 82 17 19 8.0 86 10 16 18 47 12 9+2 30 3.8 44 14 8.6 --- 18 8.7 138 43 11 14 8+0 31 7.6 22 14 6.8 --- 21 --- 8.2 11 --- TOTAL 597.7 2390.1 1561 516.3 644.7 294.2 376.3 830.9 696.2 549.5 1013.9 847.6 MEAN 19.3 79.7 50.4 16.7 22.2 9.49 12.5 26.8 23.2 17.7 32.7 28.3 MAX 180 807 426 80 86 86 90 193 142 81 376 136 MIN 2.8 2.9 10 7.5 7.1 3.3 2.4 2.9 4.0 6.4 5.2 6.9 AC-FT 1190 4740 3100 1020 1280 584 746 1650 1380 1090 2010 1680 CFSM 4.87 20.1 12.7 4.21 5.61 2.40 3.17 6.77 5.86 4.48 8.26 7.13 IN. 5.61 22.45 14.66 4.85 6.06 2.76 3.53 7.81 6.54 5.16 9.52 7.96 CAL YR 1987 TOTAL 10733.8 MEAN 29.4 MAX 807 MIN 1.3 AC-FT 21290 CFSM 7.43 IN. 100.83 WTR YR 1988 TOTAL 10318.4 MEAN 28.2 MAX 807 MIN 2.4 AC-FT 20470 CFSM 7.12 IN. 96.93 292 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 OCTUBER 1987 TO SEPTEMBER 1988 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, 16 1210 5.48 98 25.5 MAR, 01 1307 7.08 168 23.0 DEC, 11 1305 35.8 88 25.0 APR, 06 1216 10.o 88 24.0 JAN, 04 1239 20.6 101 23.0 JUL, 05 1630 8.51 103 26.5 FEB, 04 1355 14.2 102 23.0 I 293 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 971 bridge, 0.3 i (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 mil (38.6 km'). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--1960-61 (occasional low and peak-flow measurements only), March 1961 to current year. GAGE.--Water-stage recorder. Elevation of gage is 137.60 ft (41.940 m) above mean sea level. Due to flood damage, gage datum has had changes as follows: Mar. 24, 1961 to May 5, 1969, 138.95 ft (42.352 m); May 6, 1969 to Mar. 16, 1972. 135.05 ft (41.163 m); Mar. 17, 1972 to Mar 25, 1975, 138.60 ft (42.245 m). REMARKS.--Records fair. Low flow affected by diversions for water supply about 400 m upstream from gaging station (estimated mean daily discharges is 9.0 ft'is (0.255 m'/s). AVERAGE DISCHARGE.--27 years (1962-88), 68.7 ft3/s (1.946 m'/s), 62.61 in/yr (1,590 mm/yr), 49,770 acre-ft/yr (61.4 he/yr); median of yearly mean discharges, 69 ft'/s (1.95 m'/s), 50,000 acre-ft/yr (62 hm'/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 19,600 ft'/s (555 m'/s), Oct. 24, 1974, gage height, 13.62 ft (4.151 m), datum then in use, from rating curve extended above 100 ft'/s (2.83 m'/s) on basis of step-backwater analyses and slope-area measurements of peak discharges; minimum discharge, 0.86 ft'/s (0.024 m'/s), May 3, 1984. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 3,500 ft'is (99.1 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (W/s) (e/s) (ft) (m) Date Time (ft'/s) (m'/s) (ft) (m) Nov. 25 2115 *10,500 297 *12.63 3.850 Dec. 8 0430 7,380 209 10.82 3.298 Nov. 27 2045 7,380 209 10.82 3.298 Aug.24 1830 4,E4,0 132 8.87 2.704 Nov. 28 1500 3,570 101 7.90 2.408 Minimum discharge, 10 ft'is (0.238 m'/s), May 9, 10. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 34 29 86 202 185 27 20 16 24 80 23 20 2 19 31 71 159 130 42 18 14 20 68 21 18 3 171 21 70 80 328 26 17 13 18 39 66 18 4 44 57 52 62 80 23 24 14 17 31 54 17 5 26 33 41 58 52 22 332 16 17 28 25 16 6 21 95 77 94 41 21 82 16 16 81 21 16 7 20 27 691 66 37 20 26 14 15 63 28 22 8 47 22 1530 61 33 20 20 12 14 32 21 89 9 29 23 182 70 35 21 18 11 14 28 20 332 10 23 28 128 55 31 19 16 300 15 27 362 122 11 24 21 149 81 29 18 15 150 14 35 82 268 12 27 18 89 56 57 18 14 33 16 33 36 115 13 23 17 73 57 211 18 14 22 18 48 25 385 14 46 20 65 52 52 18 13 77 21 323 24 118 15 175 19 107 42 78 16 54 230 107 32 26 197 16 194 21 67 38 54 16 35 56 28 27 55 72 17 297 96 54 79 36 15 16 62 23 28 239 42 18 562 78 49 41 40 15 32 33 17 37 35 35 19 114 43 157 48 31 14 21 43 26 37 38 81 20 51 42 339 35 38 32 18 37 44 25 34 37 21 53 22 280 32 28 17 14 40 322 23 35 38 22 41 19 113 30 27 14 13 25 397 64 93 30 23 48 383 72 29 34 14 12 23 375 36 75 73 24 37 934 61 29 60 18 12 20 84 27 1010 31 25 60 1190 65 36 32 44 16 18 48 33 216 29 26 38 446 86 27 67 33 130 18 40 36 66 32 27 29 2100 62 59 162 24 52 17 48 26 36 24 28 36 801 72 48 36 26 19 17 39 28 30 44 29 39 197 54 76 29 217 17 33 229 74 29 26 30 28 117 50 37 --- 62 19 148 70 41 31 23 31 34 --- 108 86 30 --- 45 --- 25 25 --- TOTAL 2390 6950 5100 1925 2053 920 1109 1573 2136 1515 2881 2370 MEAN 77.1 232 165 62.1 70.8 29.7 37.0 50.7 71.2 48.9 92.9 79.0 MAX 562 2100 1530 202 328 217 332 300 397 323 1010 385 MIN 19 17 41 27 27 14 12 11 14 23 20 16 AC-FT 4740 13790 10120 3820 4070 1820 2200 3120 4240 3010 5710 4700 CFSM 5.17 15.5 11.0 4.17 4.75 1.99 2.48 3.41 4.78 3.28 6.24 5.30 IN. 5.97 17.35 12.73 4.81 5.13 2.30 2.77 3.93 5.33 3.78 7.19 5.92 CAL YR 1987 TOTAL 35182.1 MEAN 96.4 MAX 2100 MIN 9.2 AC-FT 69780 CFSM 6.47 IN. 87.84 WTR YR 1988 TOTAL 30922 MEAN 84.5 MAX 2100 MIN 11 AC-FT 61330 CFSM 5.67 IN. 77.20 294 RIO FAJARDO BASIN 50071000 RIO FAJARDO NEAR FAJARDO, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORD.--Water years 1960 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) SEP 1987 18... 0940 18 128 7.40 27.5 16 7.6 96 20 K910 2300 NOV 30... 0930 127 96 6.80 25.0 5.2 7.4 89 11 310 2100 FEB 1988 1... 0925 99 101 6.70 22.5 3.1 8.3 95 <10 K670 2900 APR 04... 0940 16 130 7.70 24.5 1.4 7.8 93 77 K36 2700 JUN 2... 0855 26 118 7.30 26.5 1.4 8.2 101 23 K140 930 AUG 01... 0900 22 118 7.40 26.0 1.2 8.5 104 19 K40 2600 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SIUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) SEP 1987 28... 34 0 7.2 4.0 13 1 2.0 50 <0.5 7.8 13 NOV 30... 30 FEB 1988 1... - 23 APR 04... 37 0 7.9 4.2 13 1 1.1 41 <0.5 5.7 13 JUN 2... 35 - AUG 01... 32 0 6.7 3.6 11 0.9 1.2 30 4.7 12 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L. (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) SEP 1987 28... 0.30 26 92 4.4 34 <0.01 0.20 0.02 0.48 NOV 30... - 3 <0.01 0.30 0.02 0.28 FEB 1988 1... 2 <0.01 0.20 0.02 APR 04... 0.10 27 97 4.2 <1 <0.01 0.10 0.09 0.31 JUN 2... 1 <0.01 0.30 <0.01 AUG 01... 0.10 24 84 5.0 2 <0.01 0.20 <0.01 0.29 K = non-ideal count RIO FAJARDO BASIN 50071000 RIO FAJARDO NEAR FAJARDO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTGBER 1987 TO SEPTEMBER 1988 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM M1UM, COPPER, MONIA 4- NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV.. RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE LAABLE 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) SEP 1987 28... 0.5 0.3 2.9 0.07 <1 <100 10 <1 13 30 NOV 30... 0.3 0.6 2.7 0.02 FEB 1988 1... <0.2 0.04 APR 04... 0.4 0.5 2.2 0.05 <1 <100 10 <1 <1 <10 JUN 2... <0.2 0.02 AUG 01... 0.3 0.5 2.2 0.02 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) SEP 1987 28... 1600 <5 90 <0.10 <1 1 <10 <0.010 5 0.02 NOV 30... FEB 1988 1... APR 04... 240 <5 10 <0.10 <1 1 <10 <0.010 4 0.01 JUN 2... AUG 1... PESTICIDE ANALYSES CHLOR- DI- DI- ENDO- PCB, ALDRIN, DANE, ODD, DDE, DDT, AZINON, ELDRIN SULFAN, DATE TIME TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN 1988 2... 0855 <0.10 <0.01 <0.10 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 HEPTA- METH- METHYL METHYL HEPTA- CHLOR MALA- OXY- PARA- TRI- ENDRIN, ETHION, CHLOR, EPDXIDE LINDANE THION, CHLOR, THION, THION, MIREX, DATE TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN 1988 02... <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 NAPH- THA- LENES, PARA- POLY- PER- TOX- TOTAL THION, CHLOR. THANE APHENE, TRI- 2,4-0, 2,4,5-T 2, 4-DP SILVEX, DATE TOTAL TOTAL TOTAL TOTAL THION TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN 1988 02... <0.01 <0.1 <0.10 <1 <0.01 <0.01 <0.01 <0.01 <0.01 295 RIO FAJARDO BASIN 298 50072500 RIO FAJARDO BELOW FAJARDO, PR WATER-QUALITY RECORDS LOCATION.--Lat 18'19'35", long 65'38'47", 1.2 mi (1.9 km) southwest of Playa de Fajardo, and 0.5 mi (0.8 km) east of Fajardo plaza. DRAINAGE AREA.--23.4 ml' (60.6 km.). PERIOD OF RECORD.--Water years 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) SEP 1987 28... 1250 12 193 7.90 31.0 5.5 5.2 70 17 K300 K270 NOV 30... 1210 170 127 6.20 25.5 17 6.2 75 29 K1800 2100 FEB 1988 1... 1235 101 121 6.90 24.0 3.0 8.6 102 42 2800 2400 APR 04... 1225 20 180 7.70 27.5 3.0 7.8 98 97 K1500 K99 JUN 2... 1140 25 146 7.20 29.5 6.6 6.6 86 30 490 210 AUG 01... 1200 25 147 7.60 29.5 2.5 8.2 107 15 560 K60 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- UNITY CHLO- NESS NONCARB CALCIUM SLUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED T1ON SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RPTIO (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) SEP 1987 28... 50 0 12 4.9 17 1 1.4 53 '0.5 7.0 26 NOV 30... 29 FEB 1988 1... 29 APR 04... 50 6 12 4.8 16 1 1.2 44 ,0.5 7.9 23 JUN 2... 36 AUG 01... 40 2 9.2 4.2 13 0.9 1.2 38 5.9 20 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE N020403 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) SEP 1987 28... 0.30 25 130 4.2 4 <0.01 0.10 0.07 0.43 NOV 30... 7 <0.01 0.40 0.04 0.26 FEB 1988 1... 2 - <0.01 0.20 0.04 0.16 APR 04... 0.10 23 114 6.1 1 - <0.01 0.20 <0.01 JUN 2... 10 _ _ <0.01 0.10 0.03 AUG 01... 0.10 22 98 6.7 5 <0.01 <0.10 0.02 0.48 K = non-ideal count RIO FAJARDO BASIN 50072500 RIO FAJARDO BELOW FAJARDO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA • NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- REC04- 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) NITRO- SEP 1987 28... 0.5 0.6 1.2 0.03 <1 <100 10 1 18 20 NOV 30... 0.3 0.7 3.1 0.03 FEB 1988 1... 0.2 0.4 1.8 0.02 APR 04... 0.2 0.4 1.8 0.02 <1 <100 10 2 <1 <10 JUN 2... <0.2 0.02 AUG 01... 0.5 0.02 METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELF- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE MANGA- ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE DATE (UG/L (UG/L AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/l) SEP 1987 28... 480 <5 110 <0.10 <1 <1 10 <0.010 2 0.03 NOV 30... FEB 1988 1... APR 04... 470 <5 70 <0.10 <1 <1 10 <0.010 5 0.03 JUN 2... AUG 01... 297 I I I I I 298 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 mil (3.26 km2). 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 ), fro topographic map. REMARKS.--Records poor. AVERAGE DISCHARGE.--16 years (1946-52, 1980-88), 15.0 ft'/s (0.425 m'/s), 161.68 in/yr (4,107 m/yr), 10,870 acre-ft/yr (13.4 hm7yr); median of yearly mean discharges, 14 ft'/s (0.40 m'/s), 10,100 acre-ft/yr (12 he/yr) EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 2,860 ft'/s (81.0 m'/s), Apr. 21, 1983, gage height, 8.96 ft (2.731 m), fro rating curve extended above 30 ft'/s (0.850 m'/s) en basis of step-backwater analysis; minimum daily discharge, 1.5 ft'/s (0.042 '/s), Mar. 22, Apr. 10, 1946. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 650 ft'/s (18.4 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (m'/s) (ft) (m) Date Time (W/s) (m7s) (ft) (m) Dec. 7 unknown *1,790 50.7 *7.60 2.316 Aug.10 1815 843 23.9 5.82 1.774 May 10 1615 748 21.2 5.58 1.701 Minimum discharge, 3.9 ft'/s (0.110 m 3/s), June 18. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 e16 e6.4 e16 ell() e80 e15 e8.2 6.8 5.6 9.6 6.0 8.6 2 e7.2 e6.1 e15 e35 e25 e10 0.2 6.4 5.6 36 5.4 8.1 3 e13 e5.8 e20 ei7 e18 e9.2 e6.8 6.0 5.6 6.9 26 7.9 4 e17 e5.8 e15 e18 e15 e8.2 e7.6 6.0 5.2 5.8 8.6 7.9 5 e8.2 e6.6 ell e14 e14 e7.8 15 6.4 5.2 5.4 5.5 7.6 6 e6.6 e26 e15 e15 e13 e8.0 13 14 5.0 12 5.2 7.5 7 e6.1 e16 e220 e14 e12 e7.4 9.1 7.9 4.8 10 9.1 11 8 e6.1 e6.4 e120 e14 e12 e7.4 9.0 7.9 4.8 5.9 6.5 18 9 e6.1 e6.2 e13 e14 e14 e7.2 8.5 6.4 4.7 5.8 6.1 42 10 e5.8 e6.1 e10 ell ell e7.0 8.4 94 5.0 6.0 69 28 11 e5.8 e5.8 ell e20 e10 e6.8 8.2 10 4.5 9.1 46 64 12 e5.3 e5.8 e8.8 e15 e18 e7.0 8.0 8.2 4.8 9.2 11 24 13 e5.1 e6.0 e7.6 e17 e14 e6.8 7.7 6.9 5.1 13 8.1 43 14 e5.8 e6.9 e7.0 e15 e10 e6.8 7.4 15 7.8 34 8.0 20 15 e14 e6.1 e29 e14 e24 e8.0 8.5 26 20 5.5 8.0 12 16 e23 e6.0 e12 e13 ell e6.6 8.5 8.7 6.1 5.1 16 11 17 e26 e38 e8.6 e22 e9.0 ell 7.4 8.9 4.5 5.1 21 10 18 e16 e33 e8.0 ell el4 e23 8.1 6.8 4.0 13 8.6 9.6 19 e10 e18 e66 e14 ell e12 8.3 11 13 8.8 8.2 33 20 e7.5 e10 e16 e9 4 e14 e8.2 7.4 15 11 5.9 7.4 10 21 e7.8 e7.8 e50 e8.4 e9.0 e6.8 7.4 14 31 5.6 6.9 9.3 22 e7.6 e7.2 e23 e7.8 e7.6 e6.2 6.6 7.6 16 18 24 13 23 e6.6 e41 e14 e7.6 e12 e5.8 6.2 7.5 35 7.3 12 12 24 e16 e85 e21 e8.8 e26 e15 6.2 6.7 9.3 6.0 134 9.5 25 eli e49 e17 e15 ell e32 6.8 6.4 7.8 5.8 18 8.8 26 e10 e56 e33 e8.2 e15 e15 16 5.7 8.6 10 10 8.5 27 e7.3 el40 el7 e8.0 e43 e33 8.3 5.6 6.1 5.9 10 8.1 28 e7.7 e38 e27 ell e30 e29 8.2 5.8 7.8 9.6 10 7.9 29 e7.2 e20 e15 e21 e25 e37 7.2 7.6 14 14 10 8.3 30 e6.6 e18 ell e14 --- e24 9.2 7.1 7.2 15 10 7.9 31 e6.4 --- e52 e35 e12 --- 6.6 --- 6.3 9.2 --- TOTAL 304.8 689.0 970.0 557.2 527.6 399.2 254.4 358.9 284.1 315.6 543.8 476.5 MEAN 9.83 23.0 31.3 18.0 18.2 12.9 8.48 11.6 9.47 10.2 17.5 15.9 MAX 26 140 220 110 80 37 16 94 35 36 134 64 MIN 5.1 5.8 7.0 7.6 7.6 5.8 6.2 5.6 4.0 5.1 5.2 7.5 AC-FT 605 1370 1920 1110 1050 792 505 712 564 626 1080 945 CFSM 7.80 18.2 24.8 14.3 14.4 10.2 6.73 9.19 7.52 8.08 13.9 12.6 IN. 9.00 20.34 28.64 16.45 15.58 11.79 7.51 10.60 8.39 9.32 16.06 14.07 CAL YR 1987 TOTAL 5208.8 MEAN 14.3 MAX 220 MIN 3.9 AC-FT 10330 CFSM 11.3 IN. 153.78 WTR YR 1988 TOTAL 5681.1 MEAN 15.5 MAX 220 MIN 4.0 AC-FT 11270 CFSM 12.3 IN. 167.73 e Estimated 299 RIO BLANCO BASIN 50075000 RIO ICACOS NEAR NAGUABO, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS AUGUST 1981 TO CURRENT YEAR WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 DATE TIME STREAMFLOW, INSTANTANEOUS (CFS) SPECIFIC CON- DUCTANCE (UMHOS) TEMPERA- TURE (DEG C) DATE TIME STREAMFLOW, INSTANTANEOUS (CFS) SPECIFIC CON- DUCTANCE (UMHOS) TEMPERA- TURE (DEG C) OCT, 13 1106 JAN, 15 1142 FEB, 08 1105 5.14 13.7 12.2 67.6 71 68 21.5 20.5 19.5 MAR, 03 0939 APR, 04 1224 JUL. 08 1209 9.24 19.4 6.12 99 58 59 119.0 19.5 22.0 300 THIS PAGE WAS LEFT BLANK INTENTIONALLY Antoiti Rut. bosin Drainage boundary HU! ACAO U D ®MAYA6UE2 P • $CE• COMAS. OUAYA Map area Ftio Grande do Laiaa tosin Oralnage boundary Rio Soiimos (htiguc) basin Lapa 01,1/05 a YABUCO ARROYO M A R 091Y CA RI ,9 E 1 2 1 I 5 °METERS EXPLANATION A3920 SURFACE-WATER STATION AND NUMBER Y836 QUALITY-OF-WATER STATION AND NUMBER WELL AND WELL NUMBER Figure 20.--Southeastern river basin--Rio Humacao to Rio Seco basins. 302 RIO HUMACAO BASIN 50081000 RIO HUMACAO AT LAS PIEDRAS, PR LOCATION.--Lat 18'10'27", long 65'52'11", Hydrologic unit 21010005, on left bank at downstream side of bridge on Highway 921, 0.6 mi (1.0 km) southeast of juntion with Highway 30, 0.8 (1.3 km) downstream from Quebrada Blanca and 0.8 mi (1.3 km) south of Las Piedras. DRAINAGE AREA.--6.65 mil (17.22 km 2 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--September 1958 to December 1967 (monthly discharge measurements), July 1974 to September 1977, October 1987 to September 1988. GAGE.--Water-stage recorder. Elevation of gage is 260 ft (79.2 m), from topographic map. Prior to July 1974, crest-stage gage at different datum. July 1974 to September 1977 at site 90 ft (27m) upstream at present datum. REMARKS.--Records fair except those above 1,000 ft3/s (28.3 m)/s), and estimated daily discharges, which are poor. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 20,800 ft'/s (589 m'/s) Sept. 6, 1960, gage height, 34.4 ft (10.485 m), datum then in use, from floodmarks, and rating curve extended above 5,300 ft3 /s (150 41)/s) on basis of slope-area measurement of peak flow; minimun daily discharge, 2.2 ft 3 /s (0.062 m 3 /s) July 16, 1974. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,000 ft3/s (28.3 m 3 /s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft 3/s) (m 3/s) (ft) (m) Date Time (fti/s) (40/s) (ft) (m) Nov. 24 0200 1,420 40.2 5.32 1.622 Dec. 8 unknown *20,000 566 *21.80 6.645 Nov. 27 0700 6,580 186 11.75 3.581 Aug. 24 1515 1,770 50.1 5.90 1.798 Minimum discharge, 5.5 ft3/s (0.156 m 3/s), June 8-11. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 e20 e26 22 42 22 16 12 8.5 11 24 17 23 2 e14 e21 35 34 22 15 11 8.3 8.5 27 16 19 3 e16 e18 19 30 27 14 11 7.7 7.9 15 16 19 4 e18 e45 17 31 20 14 11 7.4 7.8 12 16 18 5 e16 e40 15 46 25 14 14 7.6 6.9 11 15 18 6 e14 e80 39 42 20 13 13 42 6.6 33 14 17 7 e15 e45 1180 32 19 13 16 12 6.2 59 17 18 8 e14 e25 1220 33 21 13 11 8.5 5.9 16 16 17 9 e13 e23 87 33 25 13 10 6.9 9.3 13 16 37 10 e12 e21 66 29 21 13 10 12 7.4 25 53 27 11 ell e20 58 33 24 13 10 14 5.7 19 48 178 12 elO e23 51 32 21 13 9.9 9.2 7.9 16 22 84 13 e10 e26 46 27 36 13 9.9 8.2 11 16 18 45 14 e18 e19 42 27 19 15 9.5 11 6.3 37 16 35 15 e40 e17 40 25 18 13 10 12 34 15 17 28 16 e30 e19 38 24 17 12 11 11 29 13 18 26 17 e80 e22 35 24 16 13 9.5 8.4 13 16 20 22 18 e200 26 33 23 16 13 12 8.2 12 18 17 21 19 e60 21 32 22 16 12 11 8.7 9.9 17 15 65 20 e37 20 34 22 16 14 9.0 15 34 14 14 37 21 e34 19 33 22 16 14 8.4 11 22 12 14 24 22 e31 19 44 21 15 13 8.0 7.8 36 33 21 22 23 e28 26 31 21 15 11 8.4 7.3 19 22 21 22 24 e31 755 28 21 18 12 9.0 7.3 21 16 275 21 25 e37 158 27 21 17 13 8.5 6.6 15 21 84 19 26 e34 189 28 21 20 12 8.6 8.4 13 16 32 18 27 e32 1670 31 21 39 16 9.2 7.6 13 14 37 18 28 e29 317 33 21 17 14 8.3 7.3 12 42 31 18 29 e26 44 37 21 16 13 8.4 15 11 26 26 18 30 e24 28 36 20 --- 12 9.2 30 11 19 25 17 31 e25 --- 36 20 12 --- 20 --- 17 22 --- TOTAL 979 3782 3473 841 594 411 306.8 354.9 413.3 654 989 951 MEAN 31.6 126 112 27.1 20.5 13.3 10.2 11.4 13.8 21.1 31.9 31.7 MAX 200 1670 1220 46 39 16 16 42 36 59 275 178 MIN 10 17 15 20 15 11 8.0 6.6 5.7 11 14 17 AC-FT 1940 7500 6890 1670 1180 815 609 704 820 1300 1960 1890 CFSM 4.75 19.0 16.8 4.08 3.08 1.99 1.54 1.72 2.07 3.17 4.80 4.77 IN. 5.48 21.16 19.43 4.70 3.32 2.30 1.72 1.99 2.31 3.66 5.53 5.32 WTR YR 1988 TOTAL 13749.0 MEAN 37.6 MAX 1670 MIN 5.7 AC-FT 27270 CFSM 5.65 IN 76.91 e Estimated RIO HUMACAO BASIN 303 50082000 RIO HUMACAO AT HIGHWAY 3 AT HUMACAO, PR WATER-QUALITY RECORDS LOCATION.--Lat 18 08'49", long 65 49'37", at bridge on Highway 3, 300 ft (91 m) downstream from Quebrada Mariana, and 0.4 mi (0.6 km) south of Humacao. DRAINAGE AREA.--17.3 mil (44.8 km"). PERIOD OF RECORD.--Water years 1958-66, 1969 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PCR SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1987 08... 1140 25 273 7.40 30.0 57 5.6 74 29 K150000 47000 DEC 03... 1130 62 214 7.00 27.5 43 6.6 83 21 K17000 4700 FEB 1988 24... 1105 41 274 6.70 27.0 65 7.3 91 56 K70000 46000 APR 07... 1115 234 294 7.50 29.0 33 6.2 80 18 320000 290000 JUN 14... 1045 19 312 7.40 31.0 22 5.1 68 120 320000 K12000 AUG 18... 1045 28 262 7.30 29.0 20 6.0 78 <10 33000 7000 DATE OCT 1987 08... DEC 03... FEB 1988 24... APR 07... JUN 14... AUG 18... HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLb- NESS NONCARB CALCIUM SLUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED 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) 81 0 22 6.3 25 1 3.8 84 <0.5 14 26 61 83 76 0 21 5.7 25 1 2.8 88 <0.5 18 27 94 74 0 20 5.8 22 1 2.4 75 13 21 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1987 08... 0.20 36 184 12 88 0.77 0.03 J.80 0.61 0.59 DEC 03... 47 0.78 0.02 0.80 0.11 0.49 FEB 1988 24... 172 0.84 0.06 0.90 0.57 0.43 APR 07... 0.30 33 187 12 120 0.67 0.03 0.70 2.30 1.30 JUN 14... 35 0.39 0.01 0.40 0.84 0.56 AUG 18... 0.10 34 164 12 31 0.86 0.04 0.90 0.28 0.22 K = non-ideal count RIO HUMACAO BASIN 50082000 RIO HUMACAO AT HIGHWAY 3 AT HUMACAO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1986 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM M1UM, COPPER, MON1A * NITRO- NITRO- PROS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/I (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 1987 08... 1.2 2.0 8.9 0.41 -1 100 -10 .1 '1 20 DEC 03... 0.6 1.4 6.2 0.08 FEB 1988 24... 1.0 1.9 8.4 0.43 - APR 07... 3.6 4.3 19 0.77 1 100 20 <1 <1 20 JUN 14... 1.4 1.8 8.0 0.38 _ AUG 18... 0.5 1.4 6.2 0.29 MANGA- METH' - 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 1987 08... 4700 -5 480 0.10 2 1 40 <0.010 7 0.04 DEC 03... FEB 1988 24... -- - APR 07... 3300 11 340 <0.10 <1 10 60 <0.010 9 0.08 JUN 14... - AUG 18... - 304 RIO GUAYANES BASIN 305 50083500 RIO GUAYANES AT YABUCOA, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°03'33", long 65°54'03", at bridge on Highway 182, 1.4 mi (2.2 km) west-northwest of Yabucoa plaza. DRAINAGE AREA.--17.2 mil (44.6 km 2 ). PERIOD OF RECORD.--Water years 1958-62, 1968-70, 1980 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 DIS- OXYGEN, OXYGEN COLT- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLR. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 MO OCT 1987 14... 1230 281 85 7.20 26.5 95 6.8 84 <10 38000 240000 DEC 15... 1310 99 152 6.50 24.5 62 7.7 93 28 2000 4600 FEB 1988 23... 1155 40 153 6.60 24.0 7.7 4.3 51 12 2100 K1500 APR 19... 1110 25 115 7.50 27.0 4.2 3.2 40 37 K930 540 JUN 16... 1200 332 81 6.50 27.5 260 5.9 74 <10 61000 510000 AUG 17... 1050 32 157 7.20 26.5 7.5 7.6 94 17 K1700 3000 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- UNITY CHLO- NESS NONCARB CALCIUM SLUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLO SOLVED SOLVED SOLVED 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 1987 14... 22 2 5.5 1.9 7.6 0.7 2.8 20 <0.5 11 8.8 DEC 15... 49 FEB 1988 23... 60 APR 19... 49 0 12 4.7 16 1 1.3 60 <0.5 5.6 12 JUN 16... 21 AUG 17... 49 0 12 4.7 15 1 1.7 56 5.4 10 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1987 14... 0.10 18 68 52 160 0.56 0.04 0.60 0.15 1.50 DEC 15... 102 0.49 0.01 0.50 0.02 0.38 FEB 1988 23... 10 0.49 0.01 0.50 0.03 0.27 APR 19... 0.20 37 126 8.5 7 0.29 0.01 0.30 0.09 0.51 JUN 16... 31 0.37 0.03 0.40 0.08 0.62 AUG 17... 0.10 36 118 10 15 0.65 0.05 0.70 0.21 0.89 K = non-ideal count 306 RIO GUAYANES BASIN 50083500 RIO GUAYANES AT YABUCOA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM M1UM, COPPER, MONIA 4. NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1981 14... 1.7 2.3 10 0.22 ,l 200 ,10 1 ,1 30 DEC 15... 0.4 0.9 4.0 0.07 FEB 1988 23... 0.3 0.8 3.5 0.06 APR 19... 0.6 0.9 4.0 0.05 <1 100 <10 1 2 200 JUN 16... 0.7 1.1 4.9 0.14 AUG 17... 1.1 1.8 8.0 0.09 - MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1987 14... 11000 <5 480 <0.10 <1 <1 120 <0.010 7 0.02 DEC 15... FEB 1988 23... APR 19... 860 <5 60 <0.10 <1 <1 20 <0.010 <1 0.02 JUN 16... AUG PESTICIDE ANALYSES CHLOR- DI- DI- ENDO- PCB, ALDR1N, DANE, ODD, DDE, DOT, AZINON, ELDRIN SULFAN, DATE TIME TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN 1988 16... 1200 <0.10 <0.01 <0.10 <0.01 <0.01 <0.01 0.02 <0.01 <0.01 HEPTA- METH- METHYL METHYL HEPTA- CHLOR MALA- OXY- PARA- TRI- ENDRIN, ETHION, CHLOR, EPDXIDE LINDANE TH1ON, CHLOR, IHION, THION, MIREX, DATE TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN 1988 16... <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 NAPH­ THA­ LENES, PARA- POLY- PER- TOX- TOTAL THION, CHLOR. THANE APHENE, TRI- 2,4-D, 2,4,5-T 2, 4-DP SILVEX, DATE TOTAL TOTAL TOTAL TOTAL THION TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN 1988 16... <0.01 <0.1 -0.10 <1 -0.01 -0.01 ,0.01 -0.01 <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 old railroad crossing, 0.2 mi (0.3 km) from mouth, 0.4 mi (0.6 km) west of Playa de Guayanes, and 3.5 mi (5.6 km) northeast of Yabucoa plaza. DRAINAGE AREA.--34.0 mi 2 (88.1 km'). PERIOD OF RECORD.--Water years 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 DIS- OXYGEN, OXYGEN COLT- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1987 08... 0850 43 186 7.60 26.0 13 7.2 88 20 2700 K1400 DEC 03... 0900 172 182 6.40 25.0 45 6.4 78 18 2200 5700 FEB 1988 24... 0815 E130 278 6.50 23.5 18 6.2 72 21 2300 K18000 APR 7... 0830 49 173 7.70 24.0 120 6.7 79 11 5800 8200 JUN 14... 0830 27 171 7.60 27.0 25 6.2 77 <10 2100 4800 AUG 18... 0850 E50 162 7.50 27.5 30 6.2 78 <10 2300 3600 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM S1UM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1987 8... 48 0 12 4.4 16 1 2.2 57 <0.5 7.9 12 DEC 03... 45 FEB 1988 24... 90 -- APR 07... 49 0 12 4.6 18 1 2.2 49 <0.5 9.5 16 JUN 14... 57 AUG 18... 45 0 11 4.2 16 1 2.4 52 6.8 12 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1987 08... 0.20 37 126 15 13 0.29 0.01 0.30 0.02 0.38 DEC 03... 35 0.58 0.02 0.60 0.05 1.70 FEB 1988 24... 30 0.49 0.01 0.50 0.02 0.58 APR 07... 0.20 32 131 17 168 0.37 0.03 0.40 0.12 0.48 JUN 14... 46 <0.01 0.30 <0.01 AUG 18... 0.10 36 120 41 0.78 0.02 0.80 0.03 K = non-ideal count E = estimate 307 308 RIO GUAYANES BASIN 50086500 RIO GUAYANES ABOVE MOUTH AT PLAYA DE GUAYANES, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1987 08... 0.4 0.7 3.1 0.09 <1 -100 ,10 1 -1 -10 DEC 03... 1.8 2.4 11 0.12 FEB 1988 24... 0.6 1.1 4.9 0.20 APR 7... 0.6 1.0 4.4 0.14 1 100 <10 <1 <1 10 JUN 14... <0.2 0.06 AUG 18... <0.2 0.10 - 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 1987 8... 1400 <5 70 <0.10 <1 <1 150 <0.010 6 <0.01 DEC 03... - FEB 1988 24... APR 07... 5600 <5 210 0.10 .-1 <1 20 <0.010 3 0.01 JUN 14... - AUG 18... 309 RIO MAUNABO BASIN 50091000 RIO MAUNABO AT MAUNABO, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°00'24", long 65'54'19", at bridge on Highway 3, 0.4 mi (0.6 km) southwest of Maunabo plaza, and 1.3 mi (2.1 km) upstream from mouth. DRAINAGE AREA.--12.4 mi' (32.1 km2 ). PERIOD OF RECORD.--Water years 1958-66, 1975 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 DIS- OXYGEN, OXYGEN COL1- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1987 14... 0845 48 169 7.70 26.0 180 5.0 61 <10 330000 410000 DEC 16... 1215 56 204 6.90 27.0 11 6.8 85 36 2400 510 FEB 1988 23... 0930 21 247 6.80 23.5 17 7.8 90 18 2300 2600 APR 19... 0900 16 254 7.60 25.5 38 7.0 85 20 20000 7600 JUN 16... 0915 54 165 7.70 25.0 34 6.9 83 <10 4900 21000 AUG 17... 0820 27 233 7.30 25.5 20 6.8 82 16 4600 4800 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SIUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- D1S- (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/I. (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1987 14... 51 0 13 4.6 15 0.9 2.6 57 <0.5 11 13 DEC 16... 80 FEB 1988 23... 88 APR 19... 91 4 20 10 21 1 1.3 79 <0.5 11 17 JUN 16... 51 AUG 17... 75 0 18 7.2 19 1 1.3 73 13 15 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1987 14... 0.20 28 122 16 194 0.27 0.03 0.30 0.07 1.90 DEC 16... 16 0.69 0.01 0.70 0.01 0.19 FEB 1988 23... 46 0.39 0.01 0.40 0.02 0.28 APR 19... 0.20 50 183 7.7 217 0.18 0.02 0.20 0.62 0.68 JUN 16... 25 0.69 0.01 0.70 0.07 0.13 AUG 17... 0.10 37 156 11 22 <0.01 0.50 0.02 310 RIO MAUNABO BASIN 50091000 RIO MAUNABO AT MAUNABO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 CHRO- GEN,AM- NITRO- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS II) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1987 2 70 14... 2.0 2.3 10 0.57 1 500 30 <1 DEC 16... 0.2 0.9 4.0 0.04 FEB 1988 23... 0.3 0.7 3.1 0.15 - APR 19... 1.3 1.5 6.6 0.31 <1 100 40 1 4 200 JUN 16... 0.2 0.9 4.0 0.09 AUG 17... <0.2 0.10 METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUr 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 MANGA- (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 1987 14... 47000 <5 2200 <0.10 <1 <1 260 <0.010 5 0.01 DEC 16... FEB 1988 23... APR 19... 12000 <5 330 <0.10 <1 <1 30 <0.010 1 0.03 JUN 16... AUG 17... I 311 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 i (0.8 km) above mouth, and 1.5 mi (2.4 km) southeast of Patillas plaza. DRAINAGE AREA.--4.9 mil (12.8 km'). PERIOD OF RECORD.--Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 DIS- OXYGEN, OXYGEN COLT- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1987 19... 1015 16 264 8.00 26.5 21 7.4 91 <10 560000 28000 DEC 01... 0930 26 271 7.00 25.0 3.4 4.0 48 14 K96000 K19000 FEB 1988 08... 1105 4.6 407 7.30 24.5 15 6.0 72 120 23000 0400 APR 11... 1055 0.93 900 7.60 30.0 33 1.0 13 200 1400000 K600000 JUN 07... 1235 [0.50 798 7.30 33.0 29 0.0 0 200 5800000 730000 . AUG 12... 0915 4.8 376 7.60 28.0 6.1 4.6 58 41 5700000 1000000 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SIUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (M0/1. CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS 504) AS CL) OCT 1987 19... 75 0 17 7.9 27 1 2.2 80 <0.5 17 2C1 DEC 01... 94 FEB 1988 08... 150 -- APR 11... 160 0 38 16 64 2 9.9 290 <0.5 50 64 JUN 07... 240 AUG 12... 100 0 23 11 35 2 2.6 130 15 26 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO244103 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 1987 19... 0.20 29 168 7.1 18 0.69 0.01 0.70 0.94 0.76 DEC 01... 4 0.59 <0.01 0.60 0.63 0.87 FEB 1988 08... 21 0.28 0.02 0.30 2.6 2.4 APR 11... 0.20 33 459 1.2 56 0.04 <0.10 35.0 17 JUN 07... 54 0.04 <0.10 18.0 8.0 AUG 12... 0.10 31 207 2.7 11 0.29 <0.01 0.30 0.03 7.0 K = non-ideal count E = estimate 312 RIO CHICO BASIN 50091800 RIO CHICO AT PROVIDENCIA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA * NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1987 19... 1.7 2.4 11 0.32 '1 100 20 <1 8 <10 DEC 01... 1.5 2.1 9.3 0.22 FEB 1988 08... 5.0 5.3 23 0.80 APR 11... 52 17 2 <100 60 4 <1 30 JUN 07... 26 1.6 AUG 12... 7.0 7.3 32 1.0 METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE MANGA- 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 1987 19... 1200 <5 50 <0.10 .1 <1 10 <0.010 5 0.03 DEC 01... FEB 1988 OB... - APR 11... 600 120 80 0.20 <1 8 70 <0.010 34 3.8 JUN 07... AUG 12... I I 313 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 i (1.9 km) upstream fro Lago Patillas Dam and 2.2 mi (3.5 km) northwest of Patillas. DRAINAGE AREA.--18.3 mil (47.4 km2). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--February 1959 to October 1965 (annual low-flow and occasional measurements only), January 1966 to current year. GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 235 ft (72 m), from topographic map. REMARKS.--Records fair except those for July 23 to Aug. 2 and Aug. 11-19, which are poor. AVERAGE DISCHARGE.--22 years (1967-88), 61.3 ft'is (1.736 m'/s), 45.49 in/yr (1,155 mm/yr), 44,410 acre-ft/yr (54.8 hm7yr); median of yearly mean discharges, 61 ft'is (1.73 m'/s), 44,200 acre-ft/yr (54 hm'/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 14,800 ft'is (419 m'/s), Sept. 16, 1975, gage height, 12.45 ft (3.795 m), from rating curve extended above 250 ft'is (7.08 m'/s) on basis of slope-area measurement of peak flow; minimum discharge, 4.6 ft'/s (0.130 m'/s), May 13-16, 1968. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 2,500 ft'/s (70.8 10/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (m'/s) (ft) (m) Date Time (ft'/s) (e/s) (ft) (m) Oct. 18 0415 4,720 134 10.30 3.139 July 2 0845 4,850 137 10.39 3.167 Nov. 24 1815 3,830 108 9.63 2.935 Aug. 24 1615 4,970 141 10.47 3.191 Nov. 27 1015 *8,130 230 *12.33 3.758 Sept.11 1145 4,270 121 9.98 3.042 Dec. 7 2315 5,720 162 10.96 3.341 Minimum discharge, 9.5 ft'Js (0.269 m'/s), June 12, 13. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 55 35 172 96 51 31 34 30 13 350 59 71 2 29 31 126 94 76 34 32 23 13 1320 48 61 3 26 26 94 81 102 30 30 16 13 180 72 55 4 37 37 75 80 58 29 28 13 13 99 75 50 5 43 97 63 83 57 28 28 13 13 74 50 46 6 26 142 72 75 51 28 34 97 12 64 45 44 7 22 81 526 68 41 28 40 42 11 104 53 57 8 20 49 566 66 40 28 32 22 11 57 43 49 9 20 38 204 66 39 27 29 17 13 52 41 71 10 19 33 143 77 40 27 23 22 12 73 182 129 11 17 29 164 91 43 26 21 21 13 60 199 886 12 16 28 134 86 58 25 21 33 13 56 77 506 13 17 27 104 67 81 24 21 19 17 49 53 250 14 38 26 86 64 49 25 19 17 38 75 44 240 15 76 23 76 54 48 23 31 46 371 49 42 148 16 77 54 67 49 45 22 31 33 85 43 50 114 17 243 43 61 45 38 21 29 22 35 42 82 94 18 901 59 56 42 40 21 33 22 22 74 98 81 19 204 46 54 41 38 20 32 58 42 58 55 104 20 104 32 64 38 49 42 21 67 70 48 49 80 21 75 28 77 36 39 28 19 72 128 41 45 66 22 62 25 138 35 35 25 18 39 130 46 265 63 23 52 53 71 34 34 26 17 26 94 80 256 59 24 48 1610 57 33 49 27 15 22 49 74 852 54 25 49 605 51 33 40 34 16 19 31 70 487 50 26 63 568 46 33 34 40 15 17 28 88 184 45 27 66 1730 45 38 46 95 16 19 24 70 121 42 28 59 1350 49 35 35 113 13 17 21 169 108 40 29 61 446 45 40 32 63 19 16 24 114 130 38 30 41 259 39 35 --- 42 14 16 105 236 108 37 31 36 --- 50 31 37 --- 16 --- 108 84 --- TOTAL 2602 7610 3575 1746 1388 1069 731 912 1464 4023 4057 3630 MEAN 83.9 254 115 56.3 47.9 34.5 24.4 29.4 48.8 130 131 121 MAX 901 1730 566 96 102 113 40 97 371 1320 852 886 MIN 16 23 39 31 32 20 13 13 11 41 41 37 AC-FT 5160 15090 7090 3460 2750 2120 1450 1810 2900 7980 8050 7200 CFSM 4.59 13.9 6.30 3.08 2.62 1.88 1.33 1.61 2.67 7.09 7.15 6.61 IN. 5.29 15.47 7.27 3.55 2.82 2.17 1.49 1.85 2.98 8.18 8.25 7.38 CAL YR 1987 TOTAL 23969.9 MEAN 65.7 MAX 1730 MIN 8.5 AC-FT 47540 CFSM 3.59 IN. 48.73 WTR YR 1988 TOTAL 32807 MEAN 89.6 MAX 1730 MIN 11 AC-FT 65070 CFSM 4.90 IN. 66.69 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 1987 TO SEPTEMBER 1988 DIS- OXYGEN, COLI- STREP- CHARGE, SPE- DIS- FORM, TOCOCCI HARD- INST. CIFIC SOLVED FECAL, FECAL, NESS CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- 0.7 KF AGAR TOTAL FEET DUCT- (STAND- ATURE BID- DIS- CENT UM-MF (COLS. (MG/L DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- (COLS./ PER AS SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) 100 ML) 100 ML) CAC03) OCT 1987 07... 1100 22 139 7.80 26.0 0.7 8.4 103 280 320 44 JAN 1988 20... 1030 39 151 7.00 21.0 1.3 9.7 109 580 3600 48 APR 18... 1100 28 134 8.00 24.5 5.3 7.8 93 570 910 43 JUL 13... 1330 50 136 8.60 29.5 1.2 7.7 100 590 580 42 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- FLUO- SILICA, NONCARB CALCIUM SLUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, RIDE, DIS- WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET DIS- DIS- DIS- SOLVED TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD SOLVED SOLVED SOLVED (MG/L DATE MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L AS CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS SO4) AS CL) AS F) SI02) OCT 1987 07... 31 10 4.7 12 0.8 0.8 13 9.6 9.5 0.2 23 JAN 1988 20... 0 11 5.0 13 0.8 0.6 56 11 10 0.2 26 APR 18... 0 9.8 4.5 12 0.8 0.5 46 12 9.8 0.1 22 JUL 13... 0 9.5 4.5 13 0.9 0.7 43 10 10 0.1 25 SOLIDS, SOLIDS, NITRO- NITRO- NITRO- NITRO- PHOS- PHOS- RESIDUE SUM OF SOLIDS, GEN, GEN, GEN, GEN,AM- PHOS- PHOROUS PRATE, AT 180 CONSTI- DIS- NO2+NO3 AMMONIA AMMONIA MONIA + PHOS- PHOROUS ORTHO, ORTHO, DEG. C TUENTS, SOLVED DIS- DIS- DIS- ORGANIC PHOROUS DIS- DIS- DIS- DIS- DIS- (TONS SOLVED SOLVED SOLVED TOTAL TOTAL SOLVED SOLVED SOLVED DATE SOLVED SOLVED PER (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L) (MG/L) DAY) AS N) AS N) AS NH4) AS N) AS P) AS P) AS P) AS PO4) OCT 1987 07... 94 78 4.60 <0.10 0.04 0.05 0.6 0.02 0.03 0.01 0.03 JAN 1988 20... 105 108 11.2 0.15 0.02 0.03 0.2 0.02 0.02 <0.01 APR 18... 94 99 7.4 0.13 0.03 0.04 <0.2 0.03 0.02 0.02 0.06 JUL 13... 92 99 13.4 <0.10 0.05 0.06 0.5 0.02 0.02 0.02 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 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) (01106) (01000) (01005) (01010) (01025) (01030) (01035) (01040) (01046) (01049) OCT 1987 07... <10 <1 10 <0.5 3 <1 <3 5 36 <5 JAN 1988 20... 10 3 11 <0.5 1 <1 <3 1 35 <5 APR 18... 60 <1 11 <0.5 <1 <1 <3 1 89 <5 JUL 13... 30 <1 11 <0.5 2 <1 <3 4 41 <5 314 RIO GRANDE DE PATILLAS BASIN 316 50092000 RIO GRANDE DE PATILLAS NEAR PATILLAS, PR--Continued (National stream-quality accounting network station) WATER-QUALITY DATA, WATER YEAR OCTOBER 1981 TO SEPTEMBER 1988 DATE MANGA- MOLYB- SELF- STROH- VANA- LITHIUM NESE, MERCURY DENUM, NICKEL, NIUM, SILVER, TIUM, DIUM, ZINC, 015- DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS LI) AS MN) AS HG) AS MO) AS NI) AS SE) AS AG) AS SR) AS V) AS ZN) OCT 1987 07... JAN 1988 20... APR 18... JUL 13... 6 <4 <4 <4 12 17 6 14 <0.1 <0.1 0.2 <0.1 ,10 <10 <10 <10 <1 2 <1 I <1 <1 <1 <1 <1 <1 <1 <1 37 38 35 34 <6 <6 <6 <6 24 10 <3 15 PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT SCD . 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 JAN 1987 20... APR 1988 18... JUL 13... 1030 1100 1330 22 28 50 19 15 2.2 1.14 1.14 0.29 83 56 78 316 THIS PAGE WAS LEFT BLANK INTENTIONALLY Rib Grande de Manot," basin EXPLANATION Al°8°SURFACE—WATER STATION AND NUMBER island divide V1085 QUALITY—OF—WATER STATION AND NUMBER AIBONITO 087 WELL AND WELL NUMBER • Rio de la Plato basin CAYEY Dr &nage boundary R,b Inaaa'a Damn Isla <lnage 11115 divid Oatindar v.\ UAN DIAZ Rb Guomoniba,1 P ,'() Seca basin HW1TW-03 —14W—TW-04 HW_—TW-08 HW-TW-07 HW,TW-13 HW-TW- 14 HW—TW-08 HW-TW-15 NW—TV II ' GUAYAMA MAR R I E ,,, FA44R00 f4A.YA0UE 0 . ''''''.l'"•;;1,iiilUi4YA MA p area Figure 21.--South coast river basins--Rio Salinas to Rio Jacaguas basins. 318 RIO COAMO BASIN 50106500 RIO COAMO NEAR COAMO, PR WATER-QUALITY RECORDS LOCATION.--Lat 18 03'52", long 66 22'10', Hydrologic Unit 21010004, on Highway 153 bridge, 0.4 mi (0.6 km) above Rio de la Mina, and 1.8 mi (2.9 km) south of Coamo plaza. DRAINAGE AREA.--46.0 oil' (119.1 km2 ). PERIOD OF RECORD.--Water years 1978 to current year. WATER-QUALITY RECORDS, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1987 15... 1215 9.1 647 8.10 31.0 1.1 6.0 81 40 250 350 DEC 21... 1140 80 598 7.80 26.0 2.0 11.4 141 86 3800 7300 FEB 1988 22... 1235 17 684 7.80 27.5 2.0 9.4 118 <10 330 K50 APR 21... 1125 28 517 7.90 28.0 6.2 6.2 80 <10 100000 26000 JUN 21... 1205 7.0 646 7.50 29.5 1.2 4.5 59 <10 2500 290 AUG 16... 1135 3.8 696 7.70 31.5 0.5 5.4 72 21 47000 K17000 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SLUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- D1S- (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 1987 15... 240 18 64 19 36 1 3.6 220 <0.5 32 36 DEC 21... 240 FEB 1988 22... - 270 APR 21... 190 9 50 15 27 0.9 2.4 180 <0.5 27 28 JUN 21... 260 AUG 16... 270 14 71 23 44 1 4.0 260 32 49 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1987 15... 0.20 31 354 8.7 <1 1.19 0.21 1.4 0.20 0.50 DEC 21... 2 2.53 0.07 2.6 0.07 0.33 FEB 1988 22... 10 1.74 0.16 1.9 0.33 0.37 APR 21... 0.20 29 285 22 42 1.50 0.10 1.6 0.88 0.72 JUN 21... 5 1.06 0.24 1.3 0.56 0.74 AUG 16... 0.20 35 413 4.3 4 0.91 0.19 1.1 1.40 0.10 K = non-ideal count RIO COAMO BASIN 50106500 RIO COAMO NEAR COAMO, PR--Continued WATER-QUALITY RECORDS, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1987 15... 0.7 2.1 9.3 0.60 1 200 60 1 <1 10 DEC 21... 0.4 3.0 13 0.32 - FEB 1988 22... 0.7 2.6 12 0.63 -- APR 21... 1.6 3.2 14 0.40 <1 <100 <10 <1 <1 10 JUN 21... 1.3 2.6 12 0.59 AUG 16... 1.5 2.6 12 0.95 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 1987 15... 70 <5 80 <0.10 <1 <1 <10 <0.010 3 0.03 DEC 21. FEB 1988 22... APR 21... 1400 <5 100 <0.10 <1 <1 <10 <0.010 3 0.05 JUN 21... AUG 16... 319 I I 320 RIO DESCALABRADO BASIN 50108000 RIO DESCALABRADO NEAR LOS LLANOS, PR LOCATION.--Lat 18°03'08", long 66°25'34", Hydrologic Unit 21010004, at bridge on Highway 14, 1.5 mi (2.4 km) west of Los Llanos, and 5.3 mi (8.5 km) east of Juana Diaz. DRAINAGE AREA.--12.9 mil (33.4 ke). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--1959-65 (annual low-flow measurements only), 1965 (annual maximum discharge), January 1966 to June 1969, July to December 1969 (maximum discharge only), February 1984 to current year. GAGE.--Water-stage recorder. Elevation of gage is 220 ft (67 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 30,000 ft3/s (850 m'/s'. Oct. 7, 1985, gage height, 24.37 ft (7.43 m), from rating curve extended above 10,000 ft'is (283 10/s) on be.s , 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 m 3/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (10/s) (ft) (m) Date Time (ft3/s) (m 3/s) (ft) (m) Oct. 8 1645 1,810 51.3 8.23 2.509 Nov. 27 1630 *9,040 256 *16.05 4.892 Oct.26 2315 2,000 56.6 unknown Minimum discharge, 0.32 ft7s (0.009 '/s), Aug. 1-3. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 1.0 e10 e14 ell 6.2 2.8 1.7 el.6 .72 1.8 .43 18 2 .80 e7.0 e13 ell 6.3 2.8 el.7 el.5 .69 2.1 .41 8.1 3 .90 e5.5 e13 e10 6.0 2.4 el.6 1.4 .68 1.7 6.4 3.7 4 .72 e4.5 e12 e10 5.6 2.3 e1.6 e1.2 .67 1.5 1.8 3.5 5 .65 e4.0 e12 e9.5 5.5 2.4 1.5 el.3 .70 1.2 .54 3.3 6 .80 85 ell e9.2 5.6 2.3 1.8 el.5 .70 1.0 .50 3.0 7 .80 e6.2 184 e9.2 5.2 2.1 2.4 el.3 .68 .90 .51 3.2 8 e82 e2.7 e40 e9.0 4.6 2.1 1.8 el.2 .67 .85 .48 3.8 9 e10 e3.7 e30 e9.0 4.5 2.2 1.7 el.2 .65 .82 .51 4.1 10 e6.0 31 e28 e8.8 4.5 2.2 1.7 e10 .64 .80 1.4 4.3 11 e4.0 3.5 87 e8.8 4.1 2.1 1.6 e3.0 .78 .80 .67 9.6 12 e3.0 32 38 e8.6 4.2 2.1 1.5 el.5 1.6 .75 .49 25 13 e2.5 7.9 e20 e8.5 4.2 2.4 1.5 el.3 1.0 .70 3.0 4.2 14 e2.2 e4.0 el8 e8.4 4.0 2.3 1.6 e1.2 .72 .67 .65 2.8 15 e2.0 e3.0 e17 e8.3 3.8 2.1 1.7 e1.5 .88 .65 .46 2.8 16 el.8 e2.5 e16 e8.2 3.5 2.0 1.9 e1.3 .91 27 .46 2.1 17 e10 e2.0 e16 e8.1 3.3 2.2 2.5 el.1 .94 37 .72 24 18 e8.0 el.8 ei5 e8.0 3.2 2.4 el.7 el.0 .87 5.3 27 4.0 19 e20 el.7 e16 e7.8 3.2 2.3 el.5 e1.0 .94 2.7 .72 2.9 20 e8.0 e1.6 e17 7.7 3.1 2.4 el.4 e3.0 1.1 2.2 .52 2.7 21 e6.0 el.5 e15 7.6 3.0 2.4 el.4 e1.5 1.0 1.8 .52 18 22 e50 el.4 e14 7.5 2.9 2.2 56 el.2 .94 1.6 .80 3.8 23 e25 el.4 e13 7.2 2.9 2.2 2.1 e1.5 1.1 1.5 1.9 2.7 24 e12 57 e13 7.2 2.9 2.2 1.8 el.2 9.5 1.3 185 3.0 25 e10 10 e12 7.2 2.7 2.2 1.7 el.0 3.0 1.1 29 3.3 26 el30 5.1 e12 7.0 2.8 2.3 1.7 e.90 1.8 1.0 6.2 8.1 27 e210 697 e13 6.8 2.9 2.2 1.6 e.85 1.8 .97 3.6 3.4 28 e20 32 e14 6.8 2.7 2.7 1.5 .80 1.7 .82 2.6 2.2 29 elO e20 e13 6.6 2.8 2.2 el.6 .80 1.6 .74 2.0 1.9 30 e20 e16 e12 6.2 --- 2.1 el.8 .76 1.5 .74 1.6 17 31 e15 --- e12 6.3 1.9 --- .72 --- .55 1.5 --- TOTAL 673.17 1061.0 760 255.5 116.2 70.5 105.6 49.33 40.48 102.56 282.39 198.5 MEAN 21.7 35.4 24.5 8.24 4.01 2.27 3.52 1.59 1.35 3.31 9.11 6.62 MAX 210 697 184 11 6.3 2.8 56 10 9.5 37 185 25 MIN .65 1.4 11 6.2 2.7 1.9 1.4 .72 .64 .55 .41 1.9 AC-FT 1340 2100 1510 507 230 140 209 98 80 203 560 394 CFSM 1.68 2.74 1.90 .64 .31 .18 .27 .12 .10 .26 .71 .51 IN. 1.94 3.06 2.19 .74 .34 .20 .30 .14 .12 .30 .81 .57 CAL YR 1987 TOTAL 3682.75 MEAN 10.1 MAX 697 MIN .23 AC-FT 7300 CFSM .78 IN. 10.62 WTR YR 1988 TOTAL 3715.23 MEAN 10.2 MAX 697 MIN .41 AC-FT 7370 CFSM .79 IN. 10.71 e Estimated 321 RIO DESCALABRADO BASIN 50108000 RIO DESCALABRADO NEAR LOS LLANOS, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS APRIL 1984 TO SEPTEMBER 1985, OCTOBER 1987 TO AUGUST 1988 WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 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, 08 1131 1.07 604 29.0 MAR, 09 1020 2.32 683 24.b NOV, 09 0921 4.01 500 25.5 APR, 13 1025 1.63 644 28.0 DEC, 07 1421 110 291 26.5 MAY, 03 1338 1.41 680 31.0 JAN, 20 1306 7.73 656 25.5 AUG, 01 0931 0.51 757 27.5 FEB, 17 1603 3.16 643 26.0 322 RIO JACAGUAS BASIN 50111500 RIO JACAGUAS AT JUANA DIAZ, PR LOCATION.--Lat 18°03'16", long 66°30'40", Hydrologic Unit 21010004, on Highway 14 bridge. 0.4 mi (0.6 km) west of Juana Diaz plaza, and 4.0 mi (6.4 km) downstream from Lago Guayabal. DRAINAGE AREA.--49.8 mi' (129.0 km 2 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--March 1984 to current year. GAGE:--Water-stage recorder. Elevation of gage is 131 ft (40 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. Flow regulation from Lago Guayabal. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 40,000 ft 3 /s (1,130 mi/s), Oct. 7, 1985, gage height, 29.42 ft (8.967 m) from rating curve extended above 500 ft'/s (14.2 m'/s) on basis of step-backwater analysis and logarithmic extension; minimum daily discharge, 1.2 ft)/s (0.034 m 3 /s), May 18, 1984. EXTREMES FOR CURRENT YEAR.--Maximum discharge, 32,100 ft 3 /s (909 m'/s), Nov. 27, gage height, 26.97 ft (8.220 m) from rating curve extended above 500 ft'/s (14.2 m'/s) on basis of step-backwater analysis and logarithmic extension; minimum daily discharge 3.4 ft'/s (0.096 m'/s), June 4. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 7.3 86 325 62 e18 7.2 5.6 4.5 5.1 6.6 8.6 e15 2 6.0 43 282 115 e9.0 7.2 4.9 4.8 5.4 7.1 8.6 e14 3 5.5 63 216 98 e6.0 6.4 4.9 5.2 4.4 6.3 9.8 e13 4 5.5 46 173 65 e5.2 6.4 4.9 5.1 3.4 10 11 e12 5 5.5 41 182 32 e5.0 6.6 6.1 5.5 3.5 14 9.8 e13 6 5.4 224 191 19 e5.4 6.6 6.7 5.8 3.6 7.3 9.3 ell 7 4.9 130 228 17 e9.0 6.6 7.0 6.4 3.7 6.5 8.8 e10 8 34 134 171 20 e6.0 6.6 6.8 6.1 3.8 5.8 9.1 e9.8 9 74 222 107 39 e5.4 6.4 6.7 5.8 3.9 5.3 9.6 e9.8 10 25 122 127 29 e6.0 7.2 6.9 6.9 3.8 5.5 9.3 ell 11 20 99 268 40 e8.0 10 7.0 5.5 3.7 5.3 6.7 09 12 40 103 510 45 e6.2 10 6.6 5.3 5.7 5.3 5.8 e20 13 22 125 177 19 e6.0 9.3 5.4 5.1 5.2 5.4 6.6 e16 14 22 64 149 22 e6.4 9.0 5.1 4.9 4.3 6.1 6.9 14 15 37 38 145 18 e8.0 8.8 5.2 4.6 4.7 5.3 5.2 15 16 25 21 154 29 e18 8.8 5.4 4.8 5.7 36 5.0 31 17 28 22 146 64 e15 8.8 7.5 4.4 4.7 116 9.2 11 18 102 28 138 26 e9.0 9.1 8.3 3.9 27 21 48 12 19 90 20 142 53 e7.0 8.9 6.7 4.5 6.8 9.6 10 12 20 44 19 133 58 e6.0 8.1 7.7 4.2 6.6 8.0 7.2 13 21 92 17 97 35 e5.4 8.2 7.5 4.1 6.1 7.4 6.1 11 22 191 9.1 126 30 e7.0 8.3 6.7 4.5 5.3 7.4 6.1 14 23 214 5.5 102 9.6 e6.0 8.3 7.5 4.4 5.1 6.9 20 23 24 87 343 71 6.5 e5.4 7.6 7.1 4.7 7.1 7.8 527 23 25 17 264 83 5.1 e5.2 7.6 6.0 4.7 6.1 8.3 177 27 26 27 108 71 13 5.8 7.7 5.1 4.7 5.5 0.4 58 24 27 812 4530 56 26 5.9 7.4 4.9 4.4 5.5 8.2 e25 61 28 188 749 44 31 5.9 7.8 4.8 4.3 5.7 8.3 e21 42 29 118 549 17 e15 5.9 8.6 5.1 4.4 5.7 8.6 e18 25 30 165 376 25 el0 --- 8.7 4.9 4.7 5.8 8.6 e16 24 31 228 --- 36 e9.0 7.9 --- 4.8 --- 8.6 e17 --- TOTAL 2742.1 8600.6 4692 1060.2 217.1 246.1 185.0 153.0 172.9 380.9 1095.7 555.6 MEAN 88.5 287 151 34.2 7.49 7.94 6.17 4.94 5.76 12.3 35.3 18.5 MAX 812 4530 510 115 18 10 8.3 6.9 27 116 527 61 MIN 4.9 5.5 17 5.1 5.0 6.4 4.8 3.9 3.4 5.3 5.0 9.8 AC-FT 5440 17060 9310 2100 431 488 367 303 343 756 2170 1100 CFSM 1.78 5.76 3.04 .69 .15 .16 .12 .10 .12 .25 .71 .37 IN. 2.05 6.42 3.50 .79 .16 .18 .14 .11 .13 .28 .82 .42 CAL YR 1987 TOTAL 29293.5 MEAN 80.3 MAX 4530 MIN 3.6 AC-FT 58100 CFSM 1.61 IN. 21.88 WTR YR 1988 TOTAL 20101.2 MEAN 54.9 MAX 4530 MIN 3.4 AC-FT 39870 CFSM 1.10 IN. 15.02 e Estimated 323 RIO JACAGUAS BASIN 50111500 RIO JACAGUAS AT JUANA DIAZ, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS APRIL 1984 TO SEPTEMBER 1985, OCTOBER 1987 TO AUGUST 1988 WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 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, 08 0914 5.42 390 28.0 APR, 13 1254 5.56 361 32.0 NOV, 06 1046 138 225 27.5 MAY, 06 1128 5.48 350 30.5 JAN, 20 1041 56.4 288 24.0 AUG. 03 1504 8.67 355 31.0 FEB, 23 -- 5.23 275 24.0 324 THIS PAGE WAS LEFT BLANK INTENTIONALLY Rio Orono* 64 Arecibo basin o Grande de Monati slang diVidt F,"(o Graron fj Orlo,r,o basin Drainage boundary .... ci cinoge boundoryN 1,6'0 Guonajibo basin •I SABANA GRANDE ago Na ago No ago Lo . JUANA DIAZ o. GUAVANILLA t L ago &once ENSENADA • GUANICA Bahia do Suoyaoilla do Bahia Talky boo PLAYA DE -PONCE M A R C A Ri BE EXPLANATION .AGIJAD MAYARIJEZ CAOUAS. FAJARDO alL 125 SURFACE-WATER STATION AND NUMBER V1140 DUALITY-OF-WATER STATION AND NUMBER 0 32 WELL AND WELL NUMBER op area 1 I- I 1 I -I- 2 2 -I- 3 -I- 4 3 1 5 4 MILES I 6 KILOMETERS Figure 22.--South coast river basins--Rio Inabon to Rio Loco basins. I I I 326 RIO INABON BASIN 50112500 RIO INABON AT REAL ABAJO, PR LOCATION.--Lat 18°05'10", long 66°33'46", Hydrologic Unit 21010004, at bridge on private road, off Highway 511 at Hacienda La Concordia, 0.4 mi (0.6 km) upstream from diversion canal, 0.5 mi (0.8 km) north of Real Abajo, and 6.1 i (9.8 km) northeast of Plaza Degetau in Ponce. DRAINAGE AREA.--9.70 mil (25.12 km 2). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--1962-63 (annual low-flow measurements only), February to June 1964 (monthly measurements only), July 1964 to July 1970, April 1971 to current year. GAGE.--Water-stage recorder. Elevation of gage is 410 ft (125 m), from topographic map. Prior to April 1971 nonrecording gage and crest-stage gage at different datum. REMARKS.--Records fair. AVERAGE DISCHARGE.--22 years (1965-69, 1972-88), 18.9 ft'/s (0.535 m'/s), 26.46 in/yr (672 mm/yr), 13,690 acre-ft/yr (16.8 hm'/yr); median of yearly mean discharges, 18 ft'/s (0.51 03 /s), 13,000 acre-ft/yr (16 hm'/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 19,000 ft'is (538 m'/s), Oct. 7, 1985, gage height, 25.3 ft (7.71 ), datum then in use, from floodmark, from rating curve extended above 30 ft'is (0.850 m'/s) on basis of contracted opening and flow-over-road measurements of peak flow; minimum daily discharge, 0.80 ft'is (0.023 '/s), July 23, 1977. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 500 ft'/s (14.2 m'/s), and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (e/s) (ft) (m) Date Time (W/s) (e/s) (ft) (m) Nov. 27 1515 1,820 51.5 14.78 4.505 Sept. 24 1530 585 16.6 7.31 2.228 Aug. 24 1815 *3,480 98.6 *17.94 5.468 Minimum discharge, 1.8 ft'is (0.051 80/s), May 31, June 1. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 7.3 60 41 14 7.8 8.8 4.5 5.9 2.5 26 4.8 56 2 9.3 57 35 17 8.2 11 4.0 5.6 3.1 23 4.3 43 3 27 53 32 13 9.0 6.2 3.9 5.4 6.7 17 4.3 32 4 19 49 29 13 7.8 5.5 4.0 4.8 4.6 16 6.6 31 5 13 56 28 13 7.5 5.2 4.0 4.4 3.2 28 4.5 34 6 12 53 25 14 7.1 5.0 9.8 5.4 2.7 27 3.8 31 7 27 47 31 14 6.8 5.0 11 5.8 3.4 19 3.7 30 8 60 43 27 12 6.7 5.0 6.2 5.8 5.1 16 3.9 29 9 31 51 23 12 6.9 4.9 5.2 15 3.2 14 3.7 28 10 44 52 28 11 6.9 4.8 4.4 11 2.8 13 26 28 11 33 42 46 11 6.4 4.8 4.0 8.8 3.4 13 12 45 12 37 39 49 12 6.2 4.6 4.6 9.0 26 12 6.5 46 13 62 37 33 11 6.7 4.7 4.5 5.9 17 36 5.3 38 14 55 34 28 11 7.0 5.2 4.0 4.9 8.4 24 4.8 34 15 45 33 25 11 6.2 4.6 3.7 5.3 16 14 5.6 31 16 38 32 24 10 6.0 4.2 5.4 8.5 18 11 4.8 30 17 37 31 22 10 5.8 4.3 14 5.8 9.4 14 7.0 27 18 67 30 20 10 5.4 4.3 16 5.0 16 10 36 25 19 56 29 20 9.9 4.9 3.5 11 5.5 12 8.5 11 24 20 50 28 19 9.8 4.5 4.0 13 5.7 14 7.8 8.3 24 21 47 27 17 9.6 4.6 4.5 8.6 4.8 15 7.1 6.9 27 22 51 26 17 9.6 4.5 4.2 10 4.1 19 7.2 12 38 23 80 28 16 9.4 5.0 3.9 11 3.9 48 7.1 17 42 24 59 73 15 8.9 5.3 3.7 7.9 3.7 46 7.0 274 77 25 48 50 15 8.7 5.3 3.7 6.0 3.3 29 6.2 121 53 26 47 40 15 8.9 5.5 4.2 5.1 3.2 31 7.1 47 39 27 128 351 14 8.4 8.7 5.9 4.6 7.3 22 5.8 46 33 28 97 130 14 8.5 6.3 13 19 3.7 27 5.3 36 34 29 90 78 14 11 5.6 20 13 3.5 31 5.6 25 25 30 90 53 13 8.5 --- 7.8 7.5 3.6 21 5.7 21 52 31 95 --- 13 7.6 5.5 --- 3.0 --- 5.6 49 --- TOTAL 1561.6 1712 748 337.8 184.6 182.0 229.9 177.6 466.5 419.0 821.8 1086 MEAN 50.4 57.1 24.1 10.9 6.37 5.87 7.66 5.73 15.5 13.5 26.5 36.2 MAX 128 351 49 17 9.0 20 19 15 48 36 274 77 MIN 7.3 26 13 7.6 4.5 3.5 3.7 3.0 2.5 5.3 3.7 24 AC-FT 3100 3400 1480 670 366 361 456 352 925 831 1630 2150 CFSM 5.19 5.88 2.49 1.12 .66 .61 .79 .59 1.60 1.39 2.73 3.73 IN. 5.99 6.57 2.87 1.30 .71 .70 .88 .68 1.79 1.61 3.15 4.16 CAL YR 1987 TOTAL 7704.4 MEAN 21.1 MAX 351 MIN 2.8 AC-FT 15280 CFSM 2.18 IN. 29.55 WTR YR 1988 TOTAL 7926.8 MEAN 21.7 MAX 351 MIN 2.5 AC-FT 15720 CFSM 2.23 IN. 30.40 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 1987 TO SEPTEMBER 1988 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 I C) NOV, 24 1156 50.0 220 23.0 APR, 13 1445 7.26 295 33.0 DEC, 28 1155 14.2 266 25.0 APR, 26 1441 4.72 265 28,5 JAN, 26 1043 9.18 288 23.5 MAY, 06 0915 8.13 322 275 FEB, 23 1142 5.19 286 25.0 JUN, 27 1111 22.5 228 26.10 MAR, 28 1034 10.2 262 23.5 JUL, 26 1148 7.14 257 27.5 327 328 RIO BUCANA BASIN 50114000 RIO CERRILLOS NEAR PONCE, PR Location.--Lat 18'04'15", long 66° 34'51", Hydrologic unit 21010004, on right bank off Highway 139, 2.3 mi (3.7 km) upstream from Quebrada Ausubo and 4.6 mi (7.4 km) northeast of Plaza Degetau in Ponce. DRAINAGE AREA.--17.8 mil (46.1 km') WATER-QUALITY RECORDS PERIOD OF RECORD.--Water years 1964 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1987 20... 0945 59 252 8.30 25.0 190 7.8 95 12 2400 K16000 DEC 11... 1050 83 255 7.60 26.0 16 8.2 100 38 K680 770 FEB 1988 05... 1110 13 294 7.70 22.5 19 9.8 112 <10 K36 K30 APR 15... 1130 14 279 8.60 28.5 7.3 7.8 100 26 K36 K50 JUN 22... 1155 16 270 8.30 28.0 3.4 8.2 104 <10 K950 430 AUG 4... 1135 18 273 8.40 28.0 7.3 8.6 100 24 K170 K200 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SLUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CACO3 AS S) AS SO4) AS CL) OCT 1987 20... 120 0 36 6.2 10 0.4 1.5 140 <0.5 17 6.8 DEC 11... 110 FEB 1988 5... 130 APR 15... 120 6 36 7.2 13 0.5 1.1 110 <0.5 21 8.8 JUN 22... 110 AUG 04... 120 5 34 8.2 20 0.8 1.3 110 18 9.3 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2*NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1987 20... 0.10 23 185 4.8 471 0.89 0.01 0.90 0.03 0.67 DEC 11... 24 0.89 0.01 0.90 <0.01 0.69 FEB 1988 05... 44 0.19 0.01 0.20 <0.01 0.29 APR 15... 0.10 23 179 1.9 17 0.09 0.01 <0.10 0.02 0.38 JUN 22... 8 <0.01 0.60 0.03 AUG 04... 0.10 21 180 2.0 15 <0.01 0.20 0.02 K non-ideal count RIO BUCANA BASIN 50114000 RIO CERRILLOS NEAR PONCE, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1981 TO SEPTEMBER 1988 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM. COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN. GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1981 20... 0.7 1.6 7.1 0.01 <1 100 .10 -1 1 40 DEC 11... 0.3 1.2 5.3 0.07 FEB 1988 05... 0.2 0.40 1.8 0.02 APR 15... 0.4 0.03 <1 <100 <10 2 <1 270 JUN 22... <0.2 0.05 AUG 4... <0.2 0.03 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1987 20... 15000 <5 660 <0.10 <1 <1 50 .40.010 3 0.02 DEC 11... FEB 1988 5... APR 15... 380 12 20 <0.10 <1 1 10 <0.010 <1 0.01 JUN 22... AUG 04... 329 I I 330 RIO BUCANA BASIN 50114390 RIO BUCANA AT HWY 14 BRIDGE NEAR PONCE, PR LOCATON.--Lat.18°02'29", long 66°34'58", Hydrologic Unit 21010004. on left bank 200 ft (61 m) upstream from bridge on Highway 14, 0.2 i (0.3 km) southeast of Escuela Cerrillos, and 2.8 mi (4.5 km) northeast of Degetau Plaza in Ponce. DRAINAGE AREA.--24.9 mil (64.5 km 2 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--October 1985 to September 1986 (maximum only), published as "Rio Bucana Floodway Channel at Highway 14 bridge"), October 1986 to July 1987 (maximum only), August 1987 to current year. GAGE.--Water stage recorder and crest-stage gage. Elevation of gage is 116.40 ft (35.500 m) above mean sea level. Prior to Oct. 1, 1986, crest stage gage located at Highway 14 bridge, at elevation of mean sea level. REMARKS.--Records fair. Only minor regulation of low flow at present. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge 17,400 ft'is (493 •'/s), Oct. 7, 1985, gage height, 13.48 ft (4.109 m), (previously published as 129.88 ft (39.59 ) NM from floodmark and rating curve extended above 200 ft'/s (5.66 •'/s), on basis of step-backwater analysis; minimum daily discharge, 5.4 ft'/s (0.153 80/s), June 7, 1988, result of regulation. EXTREMES FOR WATER YEAR 1987.--Peak discharges greater than base discharge of 1,600 ft'/s (45.3 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (m7s) (ft) (m) Date Time (ft'/s) (10/s) (ft) (m) Oct. 27 unknown *1,980 56.1 *4.98 1.518 EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,600 ft 3 /s (45.3 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (m 3 /s) (ft) (m) Date Time (ft 3 /s) (10/s) (ft) (m) Oct. 8 1915 2,290 64.9 5.33 1.625 Nov. 27 1615 *13,700 388 *12.14 3.700 Oct.10 1815 2,100 59.5 5.12 1.561 Aug. 24 1915 12,600 357 11.66 3.554 Oct.18 1745 1,720 48.7 4.67 1.423 Aug. 31 1800 1,710 48.4 4.66 1.420 Oct.31 1730 2,080 58.9 5.10 1.554 Minimum daily discharge, 5.4 ft'A (0.153 m'/s), June 7, result of regulation. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 10 292 87 28 17 9.9 8.2 12 6.4 45 11 323 2 12 170 114 31 16 13 7.6 11 6.9 39 8.9 174 3 39 103 62 28 15 9.9 7.5 9.8 11 30 11 93 4 78 116 50 27 15 9.0 7.5 9.8 10 22 13 64 5 31 321 57 25 15 8.6 7.5 9.2 8.5 36 11 51 6 11 297 44 25 15 8.6 8.0 8.9 6.6 235 11 40 7 20 116 127 24 15 8.6 14 9.2 5.4 58 9.6 37 8 319 68 62 24 14 8.4 8.6 8.6 8.8 29 8.9 34 9 189 51 40 23 15 8.2 7.8 9.7 6.5 20 8.6 27 10 364 49 55 23 15 8.2 7.2 19 5.8 16 13 27 11 196 53 85 21 14 8.2 6.9 15 7.0 13 25 88 12 86 37 80 20 14 8.2 7.5 22 43 13 12 87 13 83 28 58 21 11 8.2 7.4 12 80 47 11 67 14 109 21 48 21 13 8.2 6.9 10 20 -73 11 37 15 72 18 43 20 13 8.1 6.9 9.0 14 35 13 36 16 36 19 40 21 12 7.7 6.9 22 73 19 11 46 17 30 17 38 20 11 7.7 11 11 30 34 26 54 18 476 14 36 20 11 9.5 27 8.4 154 50 146 57 19 246 12 35 19 11 8.1 11 9.6 109 18 48 58 20 70 12 34 19 11 7.5 15 9.2 44 16 22 26 21 41 10 32 19 11 7.7 20 8.0 40 14 17 25 22 70 10 31 19 10 7.8 13 8.2 20 15 17 48 23 212 22 31 19 9.7 7.5 32 7.0 97 13 37 45 24 112 588 31 18 9.4 6.8 19 6.1 168 23 2140 321 25 41 275 30 18 9.4 6.4 12 6.8 96 28 1280 360 26 31 75 29 17 9.4 6.7 10 6.7 74 11 386 167 27 610 2800 29 17 11 7.0 9.3 22 57 12 224 98 28 275 707 28 17 11 11 16 11 28 11 161 70 29 146 238 28 17 9.7 16 38 9.4 140 13 103 39 30 213 133 28 17 --- 16 14 8.6 65 17 112 39 31 573 --- 29 18 9.9 --- 6.6 --- 15 325 --- TOTAL 4801 6672 1521 656 363.6 276.6 373.7 335.8 1434.9 1020 5233.0 2638 MEAN 155 222 49.1 21.2 12.5 8.92 12.5 10.8 47.8 32.9 169 F.7.9 MAX 610 2800 127 31 17 16 38 22 168 235 2140 360 MIN 10 10 28 17 9.4 6.4 6.9 6.1 5.4 11 8.6 25 AC-FT 9520 13230 3020 1300 721 549 741 666 2850 2020 10380 5230 CFSM 6.22 8.93 1.97 .85 .50 .36 .50 .44 1.92 1.32 6.78 3.53 IN. 7.17 9.97 2.27 .98 .54 .41 .56 .50 2.14 1.52 7.82 3.94 WTR YR 1988 TOTAL 25325.6 MEAN 69.2 MAX 2800 MIN 5.4 AC-FT 50230 CFSM 2.78 IN. 37.84 331 RIO BUCANA BASIN 50114390 RIO BUCANA AT HWY 14 BRIDGE NEAR PONCE, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.-- OCTOBER 1987 TO SEPTEMBER 1988 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, 07 1453 10.1 254 29.0 FEB, 22 1425 10.1 304 26.5 NOV, 05 1440 156 295 24.5 MAR, 09 1503 8.07 292 30.5 DEC, 10 1236 35.7 338 25.5 AUG, 03 1201 10.4 289 29.0 JAN, 15 1145 19.6 313 26.5 I I 332 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 m) upstream from bridge on Highway 504, 0.2 mi (0.3 km) upstream from small unnamed tributary, 4.4 mi (7.1 km) upstream from Rio Chiquito, and 4.7 mi (7.6 km) north of Plaza Degetau in Ponce. DRAINAGE AREA.--8.82 mi' (22.84 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.--Records fair except those for estimated daily discharge, which are poor. Some low-flow regulation due to unknown activity upstream. AVERAGE DISCHARGE.--24 years (1965-88), 19.0 ft'/s (0.538 10/s), 29.25 in/yr (743 mm/yr), 13,770 acre-ft/yr (17.0 he/yr); median of yearly mean discharges, 18.5 ft'is (0.52 m'/s), 13,400 acre-ft/yr (16 hm)/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 21,000 ft)/s (595 m'/s), Oct. 7, 1985, gage height, 20.2 ft (6.16 ), fro floodmarks at downstream side of bridge, from rating curve extended above 150 ft'is (4.25 m'/s) on basis of slope-area measurement of peak flow; minimum discharge, 1.0 ft'is (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) (80/s) (ft) (m) Date Time (ft'/s) (m'is) (ft) (m) Oct. 10 1600 1,690 47.9 7.68 2.341 July 5 2015 1,110 31.4 6.47 1.972 Oct. 18 1530 971 27.5 6.14 1.871 Aug. 24 1800 2,60 76.2 9.35 2.850 Nov. 27 1630 *2,800 79.3 *9.52 2.902 Aug. 25 0515 1,240 35.1 6.77 2.063 Minimum daily discharge, 2.4 ft'is (0.068 m 3/s), June 11. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 12 91 60 12 6.7 6.0 4.0 3.3 2.7 15 6.5 44 2 11 65 56 13 6.9 5.8 3.6 3.1 2.8 12 5.9 31 3 12 45 45 11 7.5 5.6 3.8 3.1 3.8 10 5.7 21 4 15 e42 37 11 6.6 5.4 4.2 2.9 2.9 8.7 4.6 17 5 12 e50 45 11 6.6 5.3 3.8 2.8 2.8 85 3.6 14 6 10 92 32 11 6.4 5.1 4.0 2.9 2.6 63 3.4 12 7 20 54 52 10 6.3 5.2 3.7 3.0 2.6 18 3.1 17 8 45 43 47 10 6.3 5.0 3.4 2.8 2.6 11 2.9 15 9 32 33 31 10 7.3 4.8 3.5 8.2 2.5 8.1 2.6 13 10 193 45 37 9.8 7.0 4.7 3.3 12 2.5 6.8 2.7 12 11 93 60 50 9.7 6.1 4.6 3.4 7.0 2.8 6.9 3.0 54 12 29 39 49 10 6.5 4.6 3.4 4.8 51 10 2.8 82 13 24 30 32 10 7.0 4.5 3.3 3.5 20 7.5 2.7 53 14 24 24 26 10 7.9 4.8 3.2 3.2 9.1 7.5 12 30 15 23 32 22 9.9 6.2 4.7 3.4 8.1 13 6.5 29 31 16 18 42 19 9.4 6.0 4.6 3.4 11 17 13 2.5 50 17 15 16 18 9.9 5.8 4.9 5.5 5.7 7.2 16 5.8 35 18 189 14 17 9.3 5.7 4.9 8.2 5.4 45 6.6 18 25 19 79 12 17 9.0 5.5 4.2 3.8 5.5 22 7.0 6.6 21 20 37 12 15 8.6 5.7 4.7 15 5.5 10 6.4 5.1 18 21 26 12 14 8.2 5.7 4.6 7.5 4.8 9.8 5.5 3.2 17 22 26 11 14 7.9 5.7 4.1 12 4.4 8.2 7.2 3.8 16 23 62 25 13 7.9 5.6 3.9 9.3 4.0 13 7.9 57 15 24 37 220 13 7.7 5.7 4.0 4.3 4.1 65 15 551 55 25 35 103 13 7.7 5.6 3.8 3.6 4.1 26 8.2 375 85 26 41 22 12 7.6 5.5 3.9 3.3 3.9 26 6.6 83 57 27 94 765 11 7.4 7.3 4.6 3.2 7.2 18 6.4 49 32 28 114 234 13 7.2 5.8 4.9 23 4.1 64 6.1 31 24 29 71 99 12 7.6 5.6 9.5 8.2 3.7 42 6.4 23 20 30 54 72 11 7.1 --- 13 4.0 3.7 16 6.2 38 25 31 120 --- 12 6.7 5.1 --- 2.8 --- 5.4 38 --- TOTAL 1573 2404 845 287.6 182.5 160.8 168.3 150.6 512.9 405.9 1380.5 941 MEAN 50.7 80.1 27.3 9.28 6.29 5.19 5.61 4.86 17.1 13.1 44.5 31.4 MAX 193 765 60 13 7.9 13 23 12 65 85 551 85 MIN 10 11 11 6.7 5.5 3.8 3.2 2.8 2.5 5.4 2.5 12 AC-FT 3120 4770 1680 570 362 319 334 299 1020 805 2740 1870 CFSM 5.75 9.09 3.09 1.05 .71 .59 .64 .55 1.94 1.48 5.05 3.56 IN. 6.63 10.14 3.56 1.21 .77 .68 .71 .64 2.16 1.71 5.82 3.97 CAL YR 1987 TOTAL 9189.1 MEAN 25.2 MAX 765 MIN 2.0 AC-FT 18230 CFSM 2.85 IN. 38.76 WTR YR 1988 TOTAL 9012.1 MEAN 24.6 MAX 765 MIN 2.5 AC-FT 17880 CFSM 2.79 IN. 38.01 e Estimated 333 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 1987 TO SEPTEMBER 1988 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1987 02... 0900 10 288 8.30 23.5 0.5 8.0 95 ,10 380 3200 DEC 11... 0810 33 281 7.50 23.0 3.3 8.7 101 35 K1900 88000 FEB 1988 05... 0845 6.4 340 7.50 21.0 4.9 8.8 101 29 K82 310 APR 15... 0855 3.4 340 8.50 25.0 0.4 8.2 100 14 K120 K2200 JUN 22... 0930 7.1 293 8.40 24.5 1.6 8.3 99 <10 560 690 AUG 05... 0930 3.9 310 8.40 25.0 0.3 7.9 96 96 310 20 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SLUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS 5) AS SO4) AS CL) OCT 1987 02... 140 7 42 7.8 9.6 0.4 1.3 130 <0.5 8.3 7.6 DEC 11... 120 FEB 1988 05... 160 APR 15... 150 0 47 8.2 12 0.4 1.4 160 <0.5 11 11 JUN 22... 130 AUG 05... 140 0 44 7.9 11 0.4 1.3 140 9.6 9.3 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1987 02... 0.10 21 176 4.8 <1 0.79 0.01 0.80 <0.01 DEC 11... 9 1.09 0.01 1,10 0.01 0,19 FEB 1988 05... 14 0.79 0.01 0.80 <0.01 APR 15... 0.20 22 209 1.9 1 0.69 0.01 0.70 0.01 0.19 JUN 22... 2 1.09 0.01 1.10 0.03 0.27 AUG 05... 0.10 19 189 2.0 <1 0.59 0.01 0.60 0.02 0.38 K = non-ideal count 334 RIO PORTUGUES BASIN 50115000 RIO PORTUGUES NEAR PONCE, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA .. NITRO NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) NITRO- OCT 1987 02... <0.2 0.03 <100 20 <1 <1 20 <1 DEC 11... 0.2 1.3 5.8 0.05 FEB 1988 05... <0.2 0.04 APR 15... 0.2 0.90 4.0 0.04 2 <100 <10 1 <1 370 JUN 22... 0.3 1.4 6.2 0.04 AUG 05... 0.4 1.0 4.4 0.06 METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE —JAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS P8) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) MANGA- OCT 1987 02... 50 <5 <10 <0.10 <1 <1 <10 <0.010 3 0.01 DEC 11... FEB 1988 05... APR 15... 10 <5 <10 <0.10 <1 1 <lo <0.010 <1 0.01 JUN 22... AUG 05... I I RIO PORTUGUES BASIN 335 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. km) south of CSC 50115900, 0.8 i (1.3 ka) west of Highways 1 and 2 junction, and 0.7 i (1.1 km) southeast of Ponce. DRAINAGE AREA.--18.9 mil (49.0 km 2 ). PERIOD OF RECORD.--Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 DIS- OXYGEN, OXYGEN COLA- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER 1TY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1987 15... 0920 31 330 8.60 25.0 3.5 8.0 96 <10 5900 K17Q00 DEC 21... 0920 27 510 6.70 24.0 3.1 8.8 105 83 K8100 2200 FEB 1988 22... 0930 12 536 6.40 23.5 9.4 7.3 85 15 K14000 p60 APR 21... 0910 23 421 8.10 26.0 18 8.0 98 <10 59000 22000 JUN 21... 0910 20 372 8.20 26.5 7.8 8.5 105 <10 29000 2400 AUG 16... 0915 6.3 1020 7.70 28.0 38 4.7 60 13 5000 720 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY NESS NONCARB CALCIUM SLUM, SODIUM, AD- SLUM, WAT WH TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) CHLO- SULFATE RIDE, DIS- DIS- SOLVED SOLVED (MG/L (MG/L AS SO4) AS CL) OCT 1987 15... 140 6 41 8.0 18 0.7 1.9 130 <0.5 22 13 DEC 21... 180 FEB 1988 22... 160 APR 21... 150 17 43 9.6 27 1 1.8 140 <0.5 39 24 JUN 21... 130 AUG 16... 160 32 46 12 51 2 2.2 130 78 43 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDE.D (MG/i (MG/i (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 1987 15... 0.10 21 203 17 2 0.79 0.01 0.80 0.02 0.28 DEC 21... 5 1.08 0.02 1.10 0.04 0.16 FEB 1988 22... 19 0.56 0.04 u.60 0.09 0.41 APR 21... 0.20 20 243 15 60 0.86 0.04 0.90 0.30 0.30 JUN 21... 42 0.66 0.04 0.70 0.09 0.31 AUG 16... 0.20 22 334 5.6 22 0.31 0.09 0.40 0.15 0.45 K = non-ideal count 336 RIO PORTUGUES BASIN 50116200 RIO PORTUGUES AT PONCE, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA t NITRO NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1987 15... 0.3 1.1 4.9 0.06 <1 200 <10 1 <1 <10 DEC 21... 0.2 1.3 5.8 0.06 FEB 1988 22... 0.5 1.1 4.9 0.14 APR 21... 0.6 1.5 6.6 0.12 <1 <100 <10 1 <1 <10 JUN 21... 0.4 1.1 4.9 0.07 AUG 16... 0.6 1.0 4.4 0.20 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 1987 15... 630 <5 40 <0.10 1 <1 30 <0.010 9 0.01 DEC 21... FEB 1988 22... APR 21... 1600 <5 80 <0.10 <1 <1 10 <0.010 1 0.02 JUN 21... AUG 16... PESTICIDE ANALYSES CHLOR- -,I- DI- ENDO- PCB, ALDRIN, DANE, DDD, DOE, DDT, ALINON, ELDR1N SULFAN, DATE TIME TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN 1988 21... 0910 <0.10 <0.01 <0.10 <0.01 <0.01 <0.01 0.02 <0.01 <0.01 HEPTA- METH- METHYL METHYL HEPTA- CHLOR MALA- OXY- PARA- TRI- ENDRIN, ETHION, CHLOR, EPDXIDE LINDANE THION, CHLOR, THION, THION, MIREX, DATE TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN 1988 21... <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 NAPH- THA- LENES, PARA- POLY- PER- TOX- TOTAL THION, CHLOR. THANE APHENE, TRI- 2,4-D, 2,4,5-T 2, 4-DP SILVEX, DATE TOTAL TOTAL TOTAL TOTAL THION TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN 1988 21... <0.01 <0.1 <0.10 <1 <0.01 <0.01 <0.01 <0.01 <0.01 I 337 RIO GUAYANILLA BASIN 50124200 RIO GUAYANILLA NEAR GUAYANILLA, PR LOCATION.--Lat 18'02'40", long 66°47'53", Hydrologic Unit 21010004, on left bank, 0.1 mi (1.1 km) north of junction of Highways 2 and 132. 0.6 mi (1.0 km) downstream from Quebrada Consejo, 1.8 i (2.9 km) north-northwest from Plaza de Guayanilla. DRAINAGE AREA.--18.9 mil (49.0 km 2 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--March 1981 to current year. GAGE.--Water-stage recorder. Elevation of gage is 80 ft (24 m) from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. AVERAGE DISCHARGE.--7 years (1982-88), 24.5 ft'/s (0.694 m'/s), 17.60 in/yr (447 mm/yr), 17,750 acre-ft/yr (21.9 hm7yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 14,700 ft'/s (416 m'/s), Sept. 12, 1982, gage height, 20.4 ft (6.21 m), from floodmarks, from rating curve extended above 100 ft'/s (2.83 m'/s) on basis of step-backwater analysis and indirect measurement of peak flow; minimum discharge, 1.6 ftqs (0.045 10/s), Aug. 16, 1988. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 800 ft-7s (22.7 110/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (fti/s) (m'/s) (ft) (m) Date Time (ft'/s) (m'/s) (ft) (m) Oct. 10 1715 1,060 30.0 9.88 3.011 Aug. 24 2030 *4,300 122 *14.12 4.304 Oct. 23 1600 832 23.6 9.35 2.850 Sept. 11 2200 952 27.0 9.64 2.938 Oct. 24 1700 901 25.5 9.52 2.902 Sept. 23 1715 889 25.2 9.49 2.892 Nov. 24 1545 1,210 34.3 10.18 3.103 Sept. 25 1615 982 27.8 9.71 2.960 Nov. 27 1415 2.130 60.3 11.68 3.560 Minimum discharge, 1.6 ft'/s (0.045 m'/s), Aug. 16, 17. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 10 40 112 21 8.1 6.8 5.2 4.1 3.6 5.1 3.8 20 2 8.4 44 92 20 9.3 8.4 4.9 3.7 2.9 4.4 3.0 24 3 7.4 27 74 18 11 5.1 5.5 3.4 2.8 4.0 e2.8 18 4 7.4 21 59 17 8.6 4.6 5.9 3.4 2.5 4.5 e2.6 17 5 8.9 19 64 17 8.4 4.5 5.9 3.4 2.7 10 e2.4 20 6 6.8 29 50 17 8.2 4.7 6.4 3.4 2.7 22 e2.2 22 7 6.7 44 49 16 8.1 4.8 7.5 3.9 2.5 8.5 e2.1 23 8 127 21 43 15 8.1 4.8 5.7 3.9 5.8 8.9 e2.0 27 9 58 17 36 14 9.6 4.7 5.2 44 3.2 7.3 e7.0 25 10 232 27 60 13 9.8 4.7 4.7 20 2.8 7.7 29 26 11 125 22 60 11 8.3 4.7 4.3 6.1 2.7 6.2 6.3 124 12 41 17 53 11 8.7 4.7 4.4 6.0 3.5 9.0 2.5 104 13 27 22 43 11 8.6 4.7 4.5 4.5 6.1 6.5 2.1 31 14 22 16 40 12 13 5.8 4.3 4.1 4.4 6.0 2.0 21 15 23 14 34 11 10 4.8 4.3 3.9 3.9 5.9 2.0 25 16 21 14 33 11 10 4.5 5.1 4.1 4.2 16 1 7 30 17 18 43 33 11 8.9 6.0 4.3 3.9 3.4 18 14 38 18 113 14 31 10 8.6 5.1 4.7 4.1 3.2 12 51 36 19 42 12 31 10 7.9 4.1 4.2 4.2 6.6 7.5 12 28 20 25 12 30 9.5 7.5 3.9 4.1 4.4 4.4 9.2 10 23 21 118 12 27 9.1 7.1 4.1 7.2 3.7 4.0 8.2 2.9 27 22 43 12 27 8.9 6.8 4.0 9.0 3.5 4.0 6.8 18 65 23 175 45 27 8.7 6.7 3.6 32 3.0 3.6 7.9 66 149 24 227 673 26 8.6 6.6 3.6 10 3.2 6.8 28 762 126 25 59 196 25 8.6 6.6 3.6 4.4 3.2 5.0 13 292 234 26 36 82 24 8.6 7.4 3.6 3.8 3.1 14 7.3 68 114 27 136 818 22 8.4 7.6 3.7 3.7 3.5 12 8.6 35 71 28 41 565 22 8.4 6.4 4.9 30 3.3 12 9.1 27 59 29 30 255 22 14 5.3 14 7.3 3.1 8.2 19 24 46 30 26 153 26 8.9 --- 18 5.3 9.3 4.6 9.7 26 39 31 25 --- 24 8.0 9.0 --- 3.4 --- 6.5 21 --- 1502.4 TOTAL 1845.6 3286 1299 375.7 241.2 173.5 213.8 180.8 148.1 302.8 1612 MEAN 59.5 110 41.9 12.1 8.32 5.60 7.13 5.83 4.94 9.77 48.5 53.7 MAX 232 818 112 21 18 44 14 28 234 13 32 762 MIN 6.7 12 22 8.0 5.3 3.6 3.7 3.0 2.5 4.0 1.7 17 AC-FT 3660 6520 2580 745 478 344 424 359 294 601 2980 3200 CFSM 3.15 5.80 2.22 .64 .44 .30 .38 .26 .52 2.56 .31 2.84 3.17 IN. 3.63 6.47 2.56 .74 .47 .34 .42 .36 .29 .60 2.96 CAL YR 1987 TOTAL 11385.6 MEAN 31.2 MAX 818 MIN 4.0 AC-FT 22580 CFSM 1.65 IN. 22.41 WTR YR 1988 TOTAL 11180.9 MEAN 30.5 MAX 818 MIN 1.7 AC-FT 22180 CFSM 1.62 IN. 22.01 e Estimated 338 RIO GUAYANILLA BASIN 50124200 RIO GUAYANILLA NEAR GUAYANILLA, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS AUGUST 1981 TO SEPTEMBER 1985, OCTOBER 1987 TO AUGUST 1988 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURF (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) OCT, 09 1106 6.61 367 29.5 MAR, 08 1132 4.88 396 26.5 NOV, 04 1115 20.9 430 26.0 APR, 12 1208 4.43 391 31.0 DEC, 11 0843 57.3 406 24.5 MAY, 05 1226 3.62 396 32.0 JAN, 14 1442 12.7 424 28.5 AUG, 02 1138 2.96 354 31.5 FEB, 19 1245 8.04 367 28.5 RIO GUAYANILLA BASIN 339 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 m,iuth, 0.9 Ili (1.4 km) east of Central Rufina and 0.9 mi (1.4 km) southeast of Guayanilla. DRAINAGE AREA.--22.8 mil (59.1 km 2). PERIOD OF RECORD.--Water years 1960-65, 1974 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND. FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL. FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.1 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) DEC 1987 08... 1030 E75 450 7.50 25.5 78 4.8 58 32 38000 51000 FEB 1988 02... 0930 E0.5 762 7.20 24.5 4.3 3.2 38 42 21000 K14000 APR 12... 0930 E0.44 911 7.60 29.0 4.5 2.2 28 94 K9000 K13000 JUN 08... 1000 0.12 869 7.30 32.0 13 3.4 46 120 K5000 K2000 AUG 02... 1000 E71 1010 7.20 29.0 8.1 3.2 60 140 K300 K1500 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY NESS NONCARB CALCIUM SLUM, SODIUM, AD- SIUM, WAT WH TOTAL WH WAT D1S- DIS- DIS- SORP- DIS- TOT FE1 SULFIDE (MG/L TOT FLO SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) DEC 1987 CHLO SULFATE RIDE. DIS- DIS- SOLVED SOLVED (MG/L (MG/L AS SO4) AS CL) 08... 170 17 46 12 17 0 2.6 190 <0.5 41 19 FEB 1988 02... 260 APR 12... 260 0 70 20 53 1 6.7 280 <0.5 78 64 JUN 08... 290 AUG 02... 280 0 76 21 67 2 8.5 310 75 78 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/U (MG/L (MG/L AS F) S102) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) DEC 1987 08... 0.10 17 250 131 0.09 0.01 1.10 0.18 0.52 FEB 1988 02... 8 0.14 0.06 0.20 9.20 3.80 APR 12... 0.20 25 490 12 0.49 0.01 0.50 0.10 0.20 JUN 08... 10 0.15 0.05 0.20 7.90 17.0 AUG 02... 0.10 26 548 10 0.02 <0.10 K = non-ideal count E = estimate 340 RIO GUAYANILLA BASIN 50124700 RIO GUAYANILLA AT CENTRAL RUFINA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) NITRO- DEC 1987 08... 0.7 1.8 8.0 0.32 1 <100 30 1 <1 10 FEB 1988 02... 13 13 58 2.50 APR 12... 0.3 0.8 3.5 0.04 2 -100 90 2 <1 320 JUN 08... 25 25 110 81.0 AUG 02... 24 8.00 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 HAKE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) MANGA- DEC 1987 08... 2099 9 100 0.10 1 1 20 <0.010 2 0.07 FEB 1988 02... -- - APR 12... 190 <5 240 0.20 <1 1 30 <0.010 13 2.0 JUN 08... AUG 02... PESTICIDE ANALYSES CHLOR- DI- DI- ENDO- PCB, ALDRIN, DANE, ODD, DDE, DDT, AZINON, ELDRIN SULFAN, DATE TIME TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN 1988 08... 1000 <1.0 <0.10 <1.0 <0.10 <0.10 <0.10 0.17 <0.10 <0.10 HEPTA- METH- METHYL METHYL HEPTA- CHLOR MALA- OXY- PARA- TRI- ENDRIN, ETHION, CHLOR, EPDXIDE LINDANE THION, CHLOR, THION, THION, MIREX, DATE TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN 1988 08... <0.10 <0.01 <0.10 <0.10 <0.10 <0.1 <0.1 <0.1 <0.01 <0.1 NAPH­ THA­ LENES, PARA- POLY- PER- TOX- TOTAL THION, CHLOR. THANE APHENE, TRI- 2,4-0, 2,4,5-T 2, 4-DP SILVEX, DATE TOTAL TOTAL TOTAL TOTAL THION TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN 1988 08... <0.01 <1.0 <1.0 <10 <0.01 <0.01 <0.01 <0.01 <0.01 341 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 1987 TO SEPTEMBER 1988 DATE SEP 1987 TIME DIS- CHARGE, INST. CUBIC FEET PER SECOND SPE- CIFIC CON- DUCT- ANCE (US/CM) PH (STAND- ARD UNITS) TEMPER- ATURE WATER (DEG C) TUR- BID- ITY (NTU) OXYGEN, DIS- SOLVED (MG/L) OXYGEN, DIS- SOLVE' (PER- CENT SATUR- ATION) OXYGEN DEMAND, CHEM- ICAL (HIGH LEVEL) (MG/L) COLI- FORM, FECAL, 0.7 UM-MF (COLS./ 100 ML) STREP- TOCOCCI FECAL, KF AGAR (COLS. PER 100 ML) 29... 1000 E0.0 19000 7.40 29.5 18 1.0 13 31 K120000 3700 DEC 10... 1340 E90 491 7.60 29.5 21 5.4 70 40 4100 2000 FEB 1988 02... 1105 0.0 13900 7.20 25.5 7.0 5.2 63 19 33000 4900 APR 14... 1245 0.0 1045 7.80 27.5 2.5 4.2 53 29 K680 420 JUN 08... 1130 0.0 15000 7.50 31.0 4.6 6.0 81 160 3200 K1400 AUG 04... 0900 E0.0 10300 7.40 28.0 5.2 2.2 87 79 410 9600 HARD- ALKA- HARD- NESS MAGNE- SODIUM ROTAS- LINITY CHLO- NESS NONCARB CALCIUM SIUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) SEP 1987 29... 370 120 56 57 310 7 13 250 <0.5 100 470 DEC 10... 190 FEB 1988Z 02... 230 APR 14... 170 12 34 21 49 2 3.2 170 <0.5 30 71 JUN 08... 230 AUG 04... 1200 1000 100 240 1800 22 58 210 480 2900 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) SEP 1987 29... 0.30 32 1200 16 0.19 0.01 0.20 0.05 0.75 DEC 1987 10... 25 1.29 0.01 1.30 0.01 0.39 FEB 1988 02... 14 0.66 0.04 0.70 0.12 0.68 APR 14... 0.20 25 329 7 0.23 0.07 0.30 15.0 4.0 JUN 08... 5 0.08 0.02 0.10 0.18 0.42 AUG 04... 0.30 22 5730 35 0.09 0.01 0.10 0.08 0.42 K = non-ideal count E = estimate RIO LOCO BASIN 50129700 RIO LOCO AT GUANICA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) SEP 1987 29... 0.8 0.28 5.8 0.23 2 -100 220 1 10 30 DEC 10... 0.4 1.7 7.5 0.12 FEB 1988 02... 0.8 1.5 6.6 0.12 - APR 14... 19 19 85 3.3 <1 <100 50 2 <1 320 JUN 08... 0.6 0.7 3.1 0.17 -- AUG 04... 0.5 0.6 2.8 0.10 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) SEP 1987 29... 2300 <5 150 <0.10 3 1 20 <0.010 5 0.07 DEC 10... FEB 1988 02... APR 14... 510 <5 50 <0.10 <1 1 20 <0.010 2 0.03 JUN 08... AUG 04... PESTICIDE ANALYSES CHLOR- DI- DI- ENDO- PCB, ALDRIN, DANE, ODD, DDE, DDT, AZINON, ELDRIN SULFAN, DATE TIME TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN 1988 08... 1130 <0.10 <0.01 <0.10 <0.01 <0.01 <0.01 0.01 <0.01 <0.01 HEPTA- METH- METHYL METHYL HEPTA- CHLOR MALA- OXY- PARA- TR1- ENDR1N, ETHION, CHLOR, EPDXIDE LINDANE THION, CHLOR, THION, THION, MIREX, DATE TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN 1988 08... <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 NAPH- THA- LENES, PARA- POLY- PER- TOX- TOTAL THION, CHLOR. THANE APHENE, TRI- 2,4-D, 2,4,5-T 2, 4-DP SILVEX, DATE TOTAL TOTAL TOTAL TOTAL TH1ON TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN 1988 08... <0.1 -0.10 <1 <0.01 <0.01 <0.01 <0.01 <0.01 342 MAYAGUEZ RA, Yagiiez basin Rib Grande de Ariasto basin MARICAO Drainage boundary cJ Island divide Youca basin ABO ROJO Gt10 ()IMO .AOUADILL A A550100 * •AWAOUEZ CANVAS. PON GVA A. 1-Map area Rib Loan basin Boqu eron Principal L aguna Cartagena LAJ ieg EXPLANATION A380 SURFACE—WATER STATION AND NUMBER ;297 QUALITY—OF—WATER STATION AND NUMBER 143 WELL AND WELL NUMBER cOrainage boundary Coastal basin \J12 ENSENA A GUANICA a 4 b 4 MILES 6 KILOMETERS Co Figure 23.--Rio Guanajibo basin. 344 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 km 2). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--November 1985 to September 1988 (discontinued). GAGE.--Water-stage recorder. Elevation of gage is 5.77 ft (1.75 m) above mean sea level. REMARKS.--Records fair. EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 119 ft'/s (3.37 m'/s), May 13, gage height, 16.85 ft (5.136 m), from rating curve extended above 50 ft'is (1.42 m'/s) on basis of step-backwater analysis; no flow many days. EXTREMES FOR CURRENT PERIOD.--Peak discharges greater than base discharge of 12 ft'/s (.340 m'/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (m'/s) (ft) (m) Date Time (ft7s) (m 3/s) (ft) (m) Oct. 23 1645 23 0.66 15.31 4.666 Aug. 24 2130 45 1.3 15.80 4.816 Nov. 19 1815 37 1.1 15.65 4.770 Sept. 22 1845 37 1.0 15.64 4.767 Nov. 27 1415 *46 1.3 *15.82 4.822 Sept. 23 1745 23 0.64 15.30 4.663 June 21 1415 34 0.95 15.57 4.746 Sept. 25 1815 27 0.78 15.42 4.700 No flow parts or all day Mar. 14, May 4-10, June 7-10 . DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 .11 .50 .48 .12 .07 .02 .05 .01 .14 .54 .66 1.8 2 .10 .64 .55 .12 .06 .02 .04 .01 .12 .52 .61 1.4 3 .10 .31 1.4 .13 .05 .02 .04 .01 .10 .49 .62 1.3 4 .10 .16 .52 .12 .05 .02 .04 .0 .09 .50 .62 1.2 5 .09 .10 .39 .12 .05 .05 .04 .0 .06 .57 .52 1.2 6 .08 .09 .32 .11 .05 .06 .04 .0 .01 .54 .46 2.1 7 .08 .09 .25 .10 .06 .06 .03 .0 .0 .49 .46 1.4 8 .09 .08 .27 .09 .07 .05 .03 .0 .0 .46 .37 1.2 9 .08 .07 .26 .08 .06 .03 .03 .0 .0 .45 .25 1.2 10 .08 .07 .27 .07 .05 .03 .02 .0 .0 .46 .98 1.2 11 .08 .06 .26 .07 .05 .03 .02 .62 .0 .50 .63 1.8 12 .06 .06 .23 .08 .06 .03 .02 .27 .30 .52 .54 1.4 13 .06 .59 .23 .10 .06 .06 .01 .28 .27 .55 .52 1.3 14 .07 .14 .24 .11 .05 .0 .01 .59 .21 .48 .54 1.2 15 .07 .06 .23 .08 .05 .01 .03 .30 .17 .41 .57 1.4 16 .07 .05 .23 .08 .04 .04 .03 .24 .15 42 .51 1.3 17 .07 .06 .21 .08 .04 .05 .02 .21 .15 1.1 .80 1.8 18 .08 .04 .18 .08 .04 .05 .03 .19 .18 .72 .70 1.9 19 .09 3.6 .26 .08 .04 .03 .03 .18 .20 .66 .64 1.5 20 .07 1.0 .20 .08 .03 .03 .02 .18 .70 .64 .59 1.4 21 .96 .24 .17 .08 .03 .03 .01 .16 3.4 .58 .54 1.3 22 .09 .15 .17 .08 .03 .02 .03 .14 2.0 .54 .82 4.7 23 2.9 .08 .18 .08 .03 .03 .03 .14 .87 .50 1.7 4.0 24 .20 3.5 .18 .09 .03 .04 .02 .12 .89 1.1 11 2.2 25 .10 .86 .18 .09 .03 .05 .01 .11 .71 .81 9.3 5.1 26 .08 .68 .15 .10 .03 .05 .01 .28 .65 .73 3.0 2.7 27 .08 11 .14 .13 .03 .04 .01 .23 .60 .68 2.2 2.3 28 .08 2.1 .26 .10 .03 .23 .02 .26 .62 .69 1.8 2.2 29 .08 1.1 .15 .10 .03 .08 .02 .25 .60 .68 1.5 2.1 30 .08 .68 .13 .08 --- .38 .02 .20 .55 .76 1.4 2.0 31 .17 --- .13 .07 .08 --- .17 --- .68 1.5 --- TOTAL 6.45 28.16 8.82 2.90 1.30 1.72 0.76 5.15 13.74 18.77 46.35 57.6 MEAN .21 .94 .28 .094 .045 .055 .025 .17 .46 .61 1.50 1.92 MAX 2.9 11 1.4 .13 .07 .38 .05 .62 3.4 1.1 11 5.1 MIN .06 .04 .13 .07 .03 .00 .01 .00 .00 .41 .25 1.2 AC-FT 13 56 17 5.8 2.6 3.4 1.5 10 27 37 92 114 CFSM .55 2.47 .75 .25 .12 .15 .07 .44 1.21 1.59 3.93 5.05 IN. .63 2.76 .86 .28 .13 .17 .07 .50 1.35 1.84 4.54 5.64 CAL YR 1987 TOTAL 98.30 MEAN .27 MAX 11 MIN .00 AC-FT 195 CFSM .71 IN. 9.62 WTR YR 1988 TOTAL 191.72 MEAN .52 MAX 11 MIN .00 AC-FT 380 CFSM 1.38 IN. 18.77 345 LAGUNA JOYUDA BASIN 50130320 QUEBRADA MAMEY AT JOYUDA, PR--Continued WATER QUALITY RECORDS PERIOD OF RECORD.-- OCTOBER 1987 TO SEPTEMBER 1988 DATE TIME STREAMFLOW, INSTANTANEOUS (CFS) SPECIFIC CON- DUCTANCE (UMHOS) TEMPERA- TURE (DEG C) DATE TIME STREAMHOW, INSTANTANEOUS (CFS) SPECIFIC CON- DUCTANCE (UMHOS) TEMPERA- TURE (DEG C) OCT, 06 1340 OCT, 14 0815 OCT, 27 0830 NOV, 03 0800 NOV, 13 1216 NOV, 23 0730 DEC, 01 0800 DEC, 07 1350 DEC, 15 1330 DEC, 22 0808 DEC. 28 0910 0.084 0.056 0.085 0.192 0.055 0.094 0.574 0.385 0.235 0.192 0.143 384 350 280 239 309 273 270 285 329 296 297 27.0 25.0 24.0 23.0 26.0 22.5 24.0 27.5 28.0 23.0 22.0 JAN, 06 1215 JAN, 15 1210 JAN, 26 0730 FEB, 02 1210 FEB. 09 1100 FEB. 16 0738 FEB, 24 0751 MAR, 03 0820 MAR. 22 1320 APR, 07 0849 MAY, 03 1330 0.116 0.081 0.090 0.067 0.061 0.046 0.041 0.029 0.024 0.037 0.008 306 280 292 286 286 292 307 302 301 238 -- 24.0 25.0 21.0 24.0 24.0 21.0 22.0 21.0 28.0 27.5 -- RIO GUANAJIBO BASIN 346 50133600 RIO GUANAJIBO NEAR SAN GERMAN, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°07'18", long 67'03'56", at bridge on Highway 347, 2.2 mi (3.5 km) northwest of San German. DRAINAGE AREA.--45.5 mi' (117.8 km'). PERIOD OF RECORD.--Water years 1979 to current year. WATER QUALITY DATA, WATER YEARS OCTOBER 1987 TO SEPTEMBER 1988 DIS- OXYGEN, OXYGEN COLT- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.1 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) SEP 1987 30... 0855 18 557 8.00 27.0 1.4 3.0 37 16 2900 K820 DEC 1987 10... 1210 63 524 7.50 26.5 0.7 6.8 84 <10 210 260 FEB 1988 04... 1135 15 608 7.20 26.0 3.9 3.6 44 30 K66000 K1100 APR 14... 1045 8.8 712 7.60 27.5 2.1 2.4 30 12 K16000 K1900 JUN 10... 1105 5.5 577 7.50 28.5 4.4 1.0 13 33 K130000 64000 AUG 04... 0725 10 441 7.30 26.5 13 4.1 51 23 20000 13000 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SLUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) SEP 1987 30... 240 8 26 42 25 0.7 2.4 230 <0.5 29 23 DEC 10... 240 FEB 1988 04... 260 APR 14... 270 35 30 48 41 1 4.8 260 <0.5 52 42 JUN 10... 250 AUG 04... 160 25 19 28 28 1 3.3 150 40 24 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) S102) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) SEP 1987 30... 0.40 34 320 16 <1 0.27 0.13 0.40 1.70 0.60 DEC 10... <1 0.61 0.09 0.70 0.19 0.31 FEB 1988 04... 0.32 0.08 0.40 5.30 0.0 APR 14... 0.40 35 396 9.4 18 0.17 0.13 0.30 4.00 0.30 JUN 10... 2 0.01 <0.10 3.40 2.6 AUG 04... 0.30 22 247 6.7 16 0.72 0.18 0.90 1.20 0.40 K = non-ideal count RIO GUANAJIBO BASIN 50133600 RIO GUANAJIBO NEAR SAN GERMAN, PR--Continued WATER QUALITY DATA, WATER YEARS OCTOBER 1987 TO SEPTEMBER 1988 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) SIP 1987 29... 2.3 2.7 8.1 0.91 1 <100 130 1 9 20 DEC 10... 0.5 1.2 5.3 0.31 FEB 1988 04... 2.8 3.2 14 1.10 APR 14... 4.3 4.6 20 1.30 1 <100 140 1 <1 320 JUN 10... 6.0 1.80 AUG 04... 1.6 2.5 11 0.91 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) SEP 29... 330 <5 180 <0.10 3 1 10 <0.010 9 0.06 DEC 1987 10... FEB 1988 04... APR 14... 320 <5 330 <0.10 <1 1 70 <0.010 3 0.11 JUN 10... AUG 04... 347 I S48 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 mi' (47.4 km 2 ). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--October 1985 to current year. GAGE.--Water-stage recorder. Elevation of gage is 50.0 ft (15.2 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. EXTREMES FOR PERIOD OF RECORD.--Maximun discharge, 7,480 ft 3 /s (212 m'/s), Aug.24, 1988, gage height, 13.64 ft (4.16 m) from rating curve extended above 900 ft'/s (25.5 m'/s) on basis of step-backwater analysis; minimum discharge 8.7 ft'/s (0.246 '/s), Apr. 15, 1986. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,500 ft'/s (42.5 m'/s) and maximun (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (m'/s) (ft) (m) Date Time (ft'/s) (m'/s) (ft) (m) Nov. 27 1345 1,630 46.2 7.91 2.411 Aug . 24 1930 *7,480 212 *13.64 4.157 June 20 1645 2,980 84.4 9.85 3.002 Sept. 23 1700 2,040 57.8 8.58 2.615 July 9 1715 2.980 84.4 9.85 3.002 Sept. 25 1745 2,530 71.6 9.27 2.825 July 11 1815 1,990 56.4 8.49 2.588 Minimum discharge, 8.9 ft'is (0.252 m'/s), May 8, 9, June 10, 11. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 38 83 49 23 16 13 e10 12 11 22 18 266 2 41 53 107 23 16 14 e9.4 11 11 21 18 127 3 37 52 70 23 16 12 e9.2 11 11 19 17 80 4 34 43 48 22 15 11 e9.4 11 10 18 17 63 5 32 37 143 22 15 11 e10 11 10 24 16 53 6 30 34 87 21 14 11 15 9.6 9.8 20 16 79 7 37 67 61 21 14 11 12 9.6 13 18 15 56 8 88 47 51 21 14 11 11 9.1 12 17 15 44 9 52 42 45 20 14 10 11 9.7 11 213 14 39 10 178 38 40 20 13 10 10 133 9.4 92 136 38 11 86 34 37 19 14 10 9.8 112 12 169 51 52 12 48 33 34 19 16 10 9.6 38 97 93 27 81 13 39 45 32 19 18 10 9.6 24 35 60 23 43 14 35 128 31 22 15 10 9.3 29 25 39 29 36 15 33 66 30 28 13 10 11 28 15 32 46 137 16 31 59 30 20 13 11 14 17 12 58 36 97 17 31 43 29 24 12 14 29 14 11 64 31 100 18 38 37 28 20 12 13 22 13 52 45 71 153 19 32 32 35 20 12 11 36 12 25 32 38 133 20 28 32 30 18 12 10 22 13 278 27 41 69 161 24 35 57 22 58 34 27 18 11 9.6 131 13 63 22 28 91 23 59 28 27 18 11 9.3 93 13 38 21 40 301 24 42 93 27 17 12 10 50 13 40 21 998 195 25 33 83 26 17 12 12 23 13 122 28 645 393 21 48 30 28 18 12 9.7 16 12 16 25 178 289 27 42 457 24 17 15 14 14 14 40 21 118 173 28 26 36 53 25 17 13 17 12 88 42 142 24 22 12 e12 26 20 31 20 73 119 29 40 70 23 21 11 ell 20 17 31 23 56 97 30 69 54 23 18 --- e12 14 14 24 23 133 83 31 87 --- 23 17 e13 13 --- 20 174 --- TOTAL 1524 2049 1294 625 393 351.6 683.3 681.0 1308.2 1331 3153 3544 MEAN 49.2 68.3 41.7 20.2 13.6 11.3 22.8 22.0 43.6 42.9 102 118 MAX 178 457 143 28 18 16 131 133 278 213 998 393 MIN 28 28 23 17 11 9.3 9.2 9.1 9.4 17 14 36 AC-FT 3020 4060 2570 1240 780 697 1360 1350 2590 2640 6250 7030 CFSM 3.00 4.16 2.55 1.23 .83 .69 1.39 1.34 2.66 2.62 6.20 7.20 IN. 3.46 4.65 2.94 1.42 .89 .80 1.55 2.97 3.02 8.04 1.54 7.15 CAL YR 1987 TOTAL 14881.7 MEAN 40.8 MAX 457 MIN 7.6 AC-FT 29520 CFSM 2.49 IN. 33.76 WTR YR 1988 TOTAL 16937.1 MEAN 46.3 MAX 998 MIN 9.1 AC-FT 33590 CFSM 2.82 IN. 38.42 e Estimated 349 RIO GUANAJIBO BASIN 50136400 RIO ROSARIO NEAR HORMIGUEROS, PR--Continued WATER-QUALITY RECORDS PERIOD OF RECORD.--WATER YEARS 1979 TO CURRENT YEAR. PERIOD OF DAILY RECORD.-- SUSPENDED-SEDIMENT DISCHARGE: OCTOBER 1985 TO SEPTEMBER 1986 INSTRUMENTATION.--US D-49 SEDIMENT SAMPLER SINCE OCTOBER 1985. AUTOMATIC SEDIMENT SAMPLER SINCE 1986 REMARKS.--sediment samples were collected by a local observer once daily during low flow and more than once daily during high flow events for concentration and particle size analyses. Sediment samples are collected periodically by survey staff. Automatic sediment sampler set to collect samples above 200 cfs. EXTREMES FOR PERIOD OF DAILY RECORD.-- SEDIMENT CONCENTRATIONS: Maximum daily mean, 8,150 mg/L October 7, 1985; Minimum daily mean, 2 mg/L several days. SEDIMENT LOADS: Maximum daily, 74,700 tons (67,800 tonnes) October 7, 1985; Minimum daily, 0.05 ton (0.04 Tonne) several days. EXTREMES FOR CURRENT YEAR.-- SEDIMENT CONCENTRATIONS: Maximum daily mean, 1,640 mg/L November 20, 1986; Minimum daily mean, 2.0 mg/L several days SEDIMENT LOADS: Maximum daily, 4,700 tons (4,263 tonnes) September 12, 1987; Minimum daily 0.04 ton (0.04 tonne) several days. WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 DIS- OXYGEN, OXYGEN COLT- STREP- CHARGE, SPE- DIS- DEMAND, FORM. TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1987 01... 1405 39 263 8.50 28.0 0.7 8.0 103 15 K1400 34O DEC 10... 0940 40 266 7.40 24.0 1.9 8.6 103 15 520 870 FEB 1988 03... 0925 15 290 7.50 21.5 1.4 9.2 103 12 550 710 APR 13... 1015 9.6 299 8.50 26.0 1.5 9.2 113 28 K70 210 JUN 9... 0935 11 284 8.30 26.0 1.9 8.5 104 22 K73 24if, AUG 03... 0915 16 275 8.10 25.0 0.5 7.3 88 17 250 29! HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SLUM, SODIUM, AD- SLUM, WA1 WP SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1987 01... 130 9 22 18 7.8 0.3 1.8 120 <0.5 7.1 7.4 DEC 10... 130 FEB 1988 03... 140 APR 13... 140 9 28 18 11 0.4 1.2 130 <0.5 9.1 9.7 JUN 09... 130 AUG 03... 130 0 25 16 9.0 0.4 1.4 130 7.5 8.6 K = non-ideal count 350 RIO GUANAJIBO BASIN 50136400 RIO ROSARIO NEAR HORM1GUEROS, PR--Continued WATER QUALITY DATA, WATER YEARS OCTOBER 1987 TO SEPTEMBER 1988 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEM, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1987 01... 0.10 30 166 17 <1 0.39 0.01 0.40 0.02 0.28 DEC 10... <1 <0.01 0.70 <0.01 FEB 1988 03... <0.01 0.50 0.03 APR 13... 0.10 31 189 5.0 7 0.19 0.01 0.20 0.03 0.17 JUN 9... <1 0.39 0.01 0.40 0.02 0.18 AUG 03... 0.10 26 170 7.2 2 0.39 0.01 0.40 <0.01 0.29 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1987 01... 0.3 0.7 2.9 0.03 <1 <100 10 <1 13 10 DEC 10... <0.2 0.04 FEB 1988 03... <0.2 0.04 APR 13... 0.2 0.4 1.8 0.05 <1 <100 <10 3 2 430 JUN 9... <0.2 0.03 AUG 03... 0.3 0.7 3.1 0.05 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1987 01... 240 <5 10 <0.10 2 <1 <10 <0.010 8 0.01 DEC 10... FEB 1988 03... APR 13... 250 11 20 <0.10 <1 1 30 <0.010 <1 0.01 JUN 09... AUG 03... 351 RIO GUANAJIBO BASIN 50136400 RIO ROSARIO NEAR HORMIGUEROS, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 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 38 10 1.0 83 81 21 49 35 4.6 2 41 10 1.1 53 36 5.2 107 185 193 3 37 10 1.0 52 35 4.9 70 100 19 4 34 11 1.0 43 30 3.5 48 60 7.8 5 32 11 .95 37 25 2.5 143 439 757 6 30 10 .81 34 22 2.0 87 60 14 7 37 20 2.0 67 77 31 61 25 4.1 8 88 103 54 47 32 4.1 15 2.1 9 52 40 5.6 42 22 2.5 45 15 1.8 10 178 402 1160 38 20 2.1 40 14 1.5 11 86 80 19 34 20 1.8 37 12 1.2 12 48 20 2.6 33 20 1.8 34 11 1.0 13 39 15 1.6 45 56 15 32 11 .95 14 35 12 1.1 128 240 384 31 10 .84 15 33 11 .98 66 75 13 30 12 .97 16 31 10 .84 59 40 6.4 30 12 .97 17 31 10 .84 43 30 3.5 29 12 .94 18 38 20 2.1 37 25 2.5 28 11 .83 19 32 18 1.6 32 22 1.9 35 10 .95 20 28 17 1.3 32 21 1.8 30 9 .73 21 48 69 30 30 20 1.6 28 8 .60 22 58 50 7.8 34 20 2.3 27 9 .66 23 59 98 46 28 18 1.4 27 9 .66 24 42 25 2.8 93 89 42 27 8 .58 25 33 15 1.3 83 100 22 26 8 .56 26 36 12 1.2 53 50 7.2 25 8 .54 27 42 20 2.3 457 1510 4750 24 9 .58 28 42 30 3.4 142 200 77 24 10 .65 29 40 30 3.2 70 60 11 23 10 .62 30 69 64 35 54 40 5.8 23 10 .62 31 87 97 32 --- --- --- 23 10 .62 TOTAL 1524 1424.42 2049 5430.8 1294 1020.97 352 RIO GUANAJIBO BASIN 50136400 RIO ROSARIO NEAR HORM1GUEROS, PR--Cont'nued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 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 23 9 .56 16 6 .26 13 4 .14 2 23 9 .56 16 6 .26 14 4 .15 3 23 9 .56 16 6 .26 12 3 .10 4 22 10 .59 15 6 .24 11 3 .09 5 22 12 .71 15 6 .24 11 3 .09 6 21 11 .62 14 6 .23 11 3 .09 7 21 10 .57 14 7 .26 11 4 .12 8 21 10 .57 14 7 .26 11 4 .12 9 20 10 .57 14 7 .26 10 4 .11 10 20 10 .54 13 7 .25 10 4 .11 11 19 10 .51 14 7 .26 10 4 .11 12 19 10 .51 16 8 .35 10 4 .11 13 19 10 .51 18 10 .49 10 3 .08 14 22 15 .89 15 8 .32 10 3 .08 15 28 20 1.5 13 7 .25 10 3 .08 16 20 10 .54 13 7 .25 11 4 .12 17 24 10 .65 12 7 .23 14 4 .15 18 20 10 .54 12 6 .19 13 5 .18 19 20 10 .54 12 6 .19 11 5 .15 20 18 9 .44 12 6 .19 10 5 .14 21 18 9 .44 12 5 .16 9.7 5 .13 22 18 8 .39 11 4 .12 9.6 5 .13 23 18 8 .39 11 4 .12 9.3 5 .13 24 17 8 .37 12 5 .16 10 5 .14 25 17 7 .32 12 5 .16 12 5 .16 26 17 7 .32 13 5 .18 16 6 .26 27 17 6 .28 15 5 .20 14 6 .23 28 22 7 .42 12 4 .13 12 6 .19 29 21 7 .40 11 4 .12 11 5 .15 30 18 7 .34 --- --- --- 12 5 .16 31 17 7 .32 13 5 .18 TOTAL 625 16.47 393 6.59 351.6 4.18 353 RIO GUANAJIBO BASIN 50136400 RIO ROSARIO NEAR HORMIGUEROS, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 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 10 6 .16 12 6 .19 11 6 .18 2 9.4 5 .13 11 6 .18 11 6 .18 3 9.2 5 .12 11 5 .15 11 6 .18 4 9.4 5 .13 11 5 .15 10 6 .16 5 10 5 .14 11 5 .15 10 6 .16 6 15 5 .20 9.6 5 .13 9.8 5 .13 7 12 5 .16 9.6 5 .13 13 6 .21 8 11 5 .15 9.1 5 .12 12 6 .19 9 11 5 .15 9.7 5 .13 11 5 .15 10 10 5 .14 133 272 662 9.4 5 .13 11 9.8 5 .13 112 369 529 12 7 .23 12 9.6 5 .13 38 25 2.6 97 139 156 13 9.6 5 .13 24 15 .97 35 40 3.8 14 9.3 5 .13 29 20 1.6 25 30 2.0 15 11 6 .18 28 20 1.5 15 10 .41 16 14 10 .38 17 8 .37 12 10 .32 17 29 22 1.7 14 7 .26 11 10 .30 18 22 12 .71 13 7 .25 52 113 94 19 36 25 2.4 12 6 .19 25 20 1.4 20 22 10 .59 13 6 .21 278 1060 3890 21 16 6 .26 12 5 .16 161 382 428 22 131 263 530 13 5 .18 63 60 10 23 93 166 78 13 5 .18 38 50 5.1 24 50 50 6.8 13 5 .18 40 50 5.4 25 23 25 1.6 13 5 .18 122 395 936 26 17 8 .37 12 5 .16 88 100 24 27 14 7 .26 14 5 .19 40 30 3.2 28 26 20 1.4 20 10 .54 31 20 1.7 29 20 12 .65 17 9 .41 31 20 1.7 30 14 7 .26 14 7 .26 24 15 .97 31 --- --- --- 13 7 .25 --- --- --- TOTAL 683.3 627.56 681.0 1202.97 1308.2 5566.20 354 RIO GUANAJIBO BASIN 50136400 RIO ROSARIO NEAR HORMIGUEROS, PR--Continued SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 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 22 11 .65 18 9 .44 266 654 1380 2 21 10 .57 18 8 .39 127 50 17 3 19 10 .51 17 5 .23 80 10 2.2 4 18 10 .49 17 7 .32 63 10 1.7 5 24 15 .97 16 7 .30 53 10 1.4 6 20 10 .54 16 6 .26 79 71 46 7 18 10 .49 15 6 .24 56 10 1.5 8 17 10 .46 15 10 .41 44 9 1.1 9 213 1020 6160 14 10 .38 39 8 .84 10 92 200 50 136 1270 3430 38 6 .62 11 169 1080 5040 51 80 11 52 30 4.2 12 93 140 35 27 40 2.9 81 50 11 13 60 60 9.7 23 40 2.5 43 10 1.2 14 39 30 3.2 29 30 2.3 36 8 .78 15 32 20 1.7 46 15 1.9 137 759 794 16 58 85 51 36 10 .97 97 120 31 17 64 60 10 31 15 1.3 100 176 129 18 45 30 3.6 71 60 12 153 240 264 19 32 18 1.6 38 30 3.1 133 110 40 20 27 12 .87 41 20 2.2 69 50 9.3 21 24 10 .65 35 15 1.4 57 20 3.1 22 22 10 .59 28 10 .76 91 122 81 23 21 10 .57 40 25 2.7 301 1340 4890 24 21 10 .57 998 3380 48200 195 364 332 25 28 20 1.5 645 2160 5330 393 1160 5210 26 25 15 1.0 178 329 168 289 641 1140 27 21 10 .57 118 100 32 173 100 47 28 20 10 .54 73 50 9.9 119 20 o.4 29 23 10 .62 56 20 3.0 97 15 3.9 30 23 10 .62 133 470 822 83 10 2.2 31 20 9 .49 174 584 785 --- --- --- TOTAL 1331 11379.07 3153 58827.90 3544 14452.44 YEAR 16937.1 99959.57 355 RIO GUANAJIBO BASIN 50138000 RIO GUANAJIBO NEAR HORMIGUEROS, PR LOCATION.--Lat 18°08'36", long 67°08'57", Hydrologic Unit 21010003, at bridge on Highway 100, 1.4 mi (2.3 km) west of Hormigueros, and 2.0 mi (3.2 km) downstream from Rio Rosario. DRAINAGE AREA.--120 mil (311 km 2). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--Annual low-flow measurements 1959, monthly measurements April 1959 to November 1967, January 1973 to current year. GAGE.--Water-stage recorder. Datum of gage is at mean sea level. Previous to Nov. 7, 1980, at site 0.3 mi (0.5 km) upstream at datum 7.36 ft (2.243 m) higher. REMARKS.--Records fair except those for estimated daily discharges, which are poor. AVERAGE DISCHARGE.--15 years (1974-88), 214 ft'/s (6.060 DP/s), 24.22 in/yr (615 mm/yr), 155,000 acre-ft/yr (191 hm'/yr); median of yearly mean discharges, 199 ft'/s (5.64 m'/s), 140,000 acre-ft/yr (170 hm 3/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 128,000 ft'/s (3,620 m 2/s), Sept. 16, 1975, gage height, 28.50 ft (8.687 m), site and datum then in use, from rating curve extended above 100 ft3/s (2.83 10/s) on the basis of contracted-opening measurement of peak flow; minimum discharge, 4.6 ft3/s (0.130 m'/s), June 22, 1977. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 2,000 ft'/s (56.6 10/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (WA) (m7s) (ft) (m) Date Time (ft'/s) (m7s) (ft) (m) Nov. 28 0145 9,410 266 23.52 7.169 Sept. 26 0500 2,120 60.0 18.88 5.755 Aug. 25 0500 *30,400 861 *27.11 8.263 Minimum discharge, 12 ft'is (0.340 10/s), June 5-7. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 109 252 419 66 30 23 69 32 17 36 35 641 2 149 224 484 66 30 29 46 27 16 35 30 492 3 114 208 518 65 34 27 39 24 17 30 27 317 4 98 153 312 62 32 23 41 22 15 27 40 249 5 91 126 308 60 29 22 65 20 14 51 28 204 6 87 112 320 57 28 21 69 19 12 51 25 201 7 87 222 224 56 26 21 50 18 14 35 23 196 8 248 183 207 e53 26 20 36 17 57 27 22 159 9 210 185 189 e53 25 20 30 16 30 113 21 139 10 190 115 171 e53 24 20 27 72 20 186 155 129 11 273 118 160 e52 23 20 24 325 18 133 209 178 12 142 97 149 e52 30 19 23 146 88 172 80 455 1 13 112 166 140 e52 35 20 21 85 115 90 59 201 14 101 166 133 54 40 23 e20 79 66 68 46 151 15 98 150 127 65 35 20 e24 84 38 51 46 239 16 91 123 123 54 31 19 e30 52 29 49 68 e430 17 90 103 117 53 28 31 e60 41 23 176 96 645 18 99 90 112 52 28 33 e47 35 110 110 324 743 19 113 88 114 47 25 24 e70 31 245 69 337 582 20 87 79 110 43 24 19 58 30 185 55 658 303 21 115 73 100 40 22 17 38 27 293 50 325 296 22 283 73 94 40 20 17 92 24 138 42 268 506 23 407 68 90 39 21 18 264 23 80 38 446 937 24 343 300 88 37 21 19 244 23 82 46 1120 1380 25 181 455 86 35 21 38 98 20 117 55 12900 1100 26 134 280 82 34 23 42 65 20 214 51 2750 1630 27 119 1500 79 37 30 27 49 21 85 37 999 1170 28 112 5290 78 41 27 44 42 23 59 34 595 617 29 102 1340 77 43 23 66 64 32 54 48 460 479 30 119 593 72 40 --- 139 40 22 43 46 549 503 31 324 --- 70 34 221 --- 19 --- 45 730 --- TOTAL 4828 12932 5353 1535 791 1102 1845 1429 2294 2056 23471 15272 MEAN 156 431 173 49.5 27.3 35.5 61.5 46.1 76.5 66.3 757 509 MAX 407 5290 518 66 40 221 264 325 293 186 12900 1630 MIN 87 68 70 34 20 17 20 16 12 27 21 129 AC-FT 9580 25650 10620 3040 1570 2190 3660 2830 4550 4080 46550 30290 CFSM 1.30 3.59 1.44 .41 .23 .30 .51 .38 .64 .55 6.31 4.24 IN. 1.50 4.01 1.66 .48 .25 .34 .57 .44 .71 .64 7.28 4.73 CAL YR 1981 TOTAL 52021 MEAN 143 MAX 5290 MIN 22 AC-FT 103200 CFSM 1.19 IN. 16.13 WTR YR 1988 TOTAL 72908 MEAN 199 MAX 12900 MIN 12 AC-FT 144600 CFSM 1.66 IN. 22.60 e Estimated 356 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 1987 TO SEPTEMBER 1988 DIS- OXYGEN, OXYGEN COLT- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, rECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1987 01... 0855 107 372 7.80 26.0 21 4.4 54 20 K640 21000 DEC 09... 0900 191 395 6.90 25.0 6.7 5.2 63 88 5500 K16000 FEB 1988 04... 0930 34 485 7.30 22.5 7.5 86 K1300 470 APR 14... 0825 21 485 8.00 25.5 3.1 6.8 82 37 330 K1400 JUN 10... 0905 22 421 8.00 26.0 3.5 6.5 80 24 350 940 AUG 03... 1240 25 399 8.20 27.5 14 6.9 87 13 K690 2300 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SIUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT 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 1987 01... 180 1 28 27 11 0.4 3.2 180 <0.5 15 12 DEC 09... 190 FEB 1988 04... -- 230 APR 14... 210 0 28 33 17 0.5 2.2 200 <0.5 23 20 JUN 10... 170 AUG 03... 180 4 27 27 14 0.5 1.8 170 15 14 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER 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 1987 01... 0.10 31 235 68 33 0.54 0.06 0.60 0.12 0.68 DEC 9... 12 0.64 0.06 0.70 0.11 0.49 FEB 1988 04... 19 1.07 0.03 1.10 0.08 0.22 APR 14... 0.20 32 281 16 5 0.79 0.01 0.80 0.02 0.28 JUN 10... - 1 0.93 0.07 1.00 0.22 0.38 AUG 03... 0.10 30 234 16 25 0.59 0.01 0.60 0.02 0.48 K = non-ideal count RIO GUANAJIBO BASIN 50138000 RIO GUANAJIBO NEAR HORMIGUEROS, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEM, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1987 01... 0.8 0.68 3.7 0.32 <1 100 70 1 <1 30 DEC 9... 0.6 1.3 5.8 0.32 FEB 1988 04... 0.3 1.4 6.2 0.61 APR 14... 0.3 1.1 4.9 0.35 9 <100 50 1 4 510 JUN 10... 0.6 1.6 7.1 0.40 AUG 03... 0.5 1.1 4.9 0.31 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 1987 01... 9700 <5 440 <0.10 <1 <1 30 <0.010 9 0.02 DEC 09... FEB 1988 04... APR 14... 530 <5 70 <0.10 <1 1 60 <0.010 2 0.04 JUN 10... AUG 03... PESTICIDE ANALYSES CHLOR- DI- DI- ENDO- PCB, ALDRIN, DANE, DDD, DDE, DDT, AZINON, ELDRIN SULFAN, DATE TIME TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN 1988 10... 0905 <0.10 <0.01 <0.10 <0.01 <0.01 <0.01 0.02 <0.01 <0.01 HEPTA- METH- METHYL METHYL HEPTA- CHLOR MALA- OXY- PARA- TRI- ENDRIN, ETHION, CHLOR, EPDXIDE L1NDANE THION, CHLOR, THION, THION, MIREX, DATE TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN 1988 10... <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 NAPH- THA- LENES, PARA- POLY- PER- TOX- TOTAL THION, CHLOR. THANE APHENE, TRI- 2,4-0, 2,4,5-T 2, 4-DP SILVEX, DATE TOTAL TOTAL TOTAL TOTAL THION TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN 1988 10... <0.01 <0.1 <0.10 <1 <0.01 0.29 <0.01 0.01 <0.01 357 358 THIS PAGE WAS LEFT BLANK INTENTIONALLY Rya Culebrinas basin BLARES A ASCO ia Grand Rio Guoja too° basin Rio Camuy basin LAS MARIA MAYA UEZ Coastal basin Rio Guanaiibo basin MAR IC AO b.oundory olos Lag rOr rLvpo Prieto EXPLANATION A440 SURFACE—WATER STATION AND NUMBER QUALITY—OF—WATER STATION AND NUMBER 1388 Rio Yauco basin Guoyonil basin Island divide Map area .A0UADUA, CAGUAS., GUM FAJARD Figure 24.--Rio Yaguez and Rio Grande de Afiasco basins. 360 RIO YAGUEZ BASIN 50138800 RIO YAGUEZ NEAR MAYAGUEZ, PR WATER-QUALITY RECORDS LOCATION.--Lat 18°12'31", long 67°07'07", at steel-truss bridge on unnumbered paved road about 800 ft (244 m) south of Highway 106, 1.8 mi (2.9 km) west of Highways 106 and 352 junction, and 1.4 mi (2.3 km) east-northeast from Mayaguez plaza. DRAINAGE AREA.--6.7 mil (17.3 km 2 ). PERIOD OF RECORD.--Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 DIS- OXYGEN, OXYGEN CDLI- STREP­ CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 kr AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) SEP 1987 30... 1135 13 290 8.40 25.0 1.6 7.6 91 <10 5600 9600 DEC 09... 1140 10 218 7.60 23.5 1.9 8.2 96 <10 K900 450 FEB 1988 03... 1215 2.8 311 7.40 24.0 0.4 9.6 113 <10 220 460 APR 13... 1305 1.9 310 8.40 27.0 0.3 8.9 111 29 220 280 JUN 09... 1210 1.6 314 8.20 27.5 2.0 3.9 49 27 220 280 AUG 2... 1240 3.0 301 8.20 26.5 0.4 8.9 110 <10 350 630 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SLUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) SEP 1987 09... 130 3 35 11 11 0.4 2.3 130 <0.5 7.7 8.9 DEC 09... 120 FEB 1988 3... 140 APR 13... 140 0 37 11 13 0.5 2.5 140 <0.5 11 11 JUN 09... 140 AUG 02... 130 0 34 11 12 0.5 2.4 130 8.8 10 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) SI02) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) SEP 1987 30... 0.10 30 180 6.2 <1 0.79 0.01 0.80 0.04 0.16 DEC 09... <1 0.89 0.01 0.90 0.01 0.19 FEB 1988 03... <1 0.49 0.01 0.50 0.01 0.29 APR 13... 0.20 30 199 1.0 3 <0.01 0.20 0.01 JUN 09... <1 <0.01 0.30 0.05 AUG 02... 0.10 28 187 1.5 4 0.39 0.01 0.40 0.01 0.19 K = non-ideal count RIO YAGUEZ BASIN 50138800 RIO YAGUEZ NEAR MAYAGUEZ, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA 4. NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) SEP 1987 30... 0.2 1.0 3.7 0.05 '.1 <100 30 1 8 101 DEC 09... 0.2 1.1 4.9 0.04 FEB 1988 03... 0.3 0.80 3.5 0.05 APR 13... <0.2 0.04 <1 <100 10 1 <1 370 JUN 09... <0.2 0.04 AUG 02... 0.2 0.60 2.7 0.05 MANGA- METHY­ IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB­ DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) 1 SEP 1987 30... 120 <5 10 <0.10 3 1 10 <0.010 8 0.01 DEC 09... FEB 1988 03... APR 13... 30 <5 10 <0.10 <1 1 10 <0.010 <1 0.01 JUN 09... AUG 02... 361 I 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 mi' (68.1 km') this does not include 36.2 mi' (93.8 km') which contributes only dur- ing high floods, and 3.5 i' (9.1 km 2 ) 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 1987 TO SEPTEMBER 1988 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1987 02... 0750 25 402 7.60 23.5 1.2 7.9 94 16 260 290 DEC 16... 0940 45 299 7.70 23.5 0.6 9.2 109 38 K150 850 FEB 1988 04... 1040 23 312 7.70 23.0 0.4 10.2 120 <10 K10 330 APR 14... 0800 22 272 7.30 23.0 3.2 7.6 89 47 K680 3300 JUN 09... 1030 12 323 7.80 27.5 1.2 9.2 116 <10 K54 K40 AUG 04... 1100 22 318 7.50 27.0 3.7 9.5 118 <10 K130 K120 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SIUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1987 02... 130 21 36 10 12 0.5 2.0 110 <0.5 24 9.8 DEC 16... 110 FEB 1988 04... 120 APR 14... 100 6 27 8.0 14 0.6 2.4 86 <0.5 20 11 JUN 09... 110 AUG 04... 130 15 35 10 13 0.5 1.6 110 27 10 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- 01S- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER 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 1987 02... 0.10 32 192 13.1 <1 0.89 0.01 0.90 0.03 0.17 DEC 16... 4 1.39 0.01 1.40 0.01 0.19 FEB 1988 04... 8 0.89 0.01 0.90 0.02 0.68 APR 14... 0.20 27 167 10.1 5 1.30 0.20 1.50 0.15 0.05 JUN 09... 1 0.79 0.01 0.80 0.02 1.3 AUG 04... 0.10 31 196 12 10 <0.01 0.50 0.01 K = non-ideal count 362 RIO GRANDE DE ANASCO BASIN 50143000 RIO GRANDE DE ANASCO NEAR LARES, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MlUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1987 02... 0.2 1.1 2.0 0.03 <1 <100 20 <1 <1 20 DEC 16... 0.2 1.6 4.8 0.03 FEB 1988 04... 0.7 1.6 7.1 0.04 APR 14... 0.2 1.7 7.5 0.13 <1 100 40 <1 13 320 JUN 09... 1.3 2.1 6.3 0.05 AUG 04... <0.2 0.04 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 ERABLi TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS P8) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1987 02... 180 <5 30 <0.10 2 <1 <10 <0.010 1 0.01 DEC 16... FEB 1988 04... APR 14... 23000 <5 480 <0.10 <1 <1 60 <0.010 2 0.01 JUN 09... AUG 04... 383 384 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 mi (0.6 km) downstream from Quebrada La Zumbadora, 4.4 mi (7.1 km) northwest of Las Marias, 5.4 mi (8.7 km) southwest of San Sebastian. DRAINAGE AREA.--94.3 mi' (244.2 km 2 ), does not include 36.2 mi' (93.8 km') which contributes only during high floods, and 3.5 mi' (9.1 km') 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.--Records fair. Transbasin diversion (except during floods) to Rio Yauco basin for hydroelectric power and irrigation above Lago Guayo. Yahuecas, and Prieto, combined useable storage 17,300 acre-ft (21.3 hm'). Limited storm runoff is contributed to basin by 3.5 mi' (9.1 km') above Rio Toro Diversion dam. AVERAGE DISCHARGE.--25 years (1964-88), 310 ft'is (8.779 10/s), 44.64 in/yr (1,134 mm/yr), 224,600 acre-ft/yr (277 hmYyr); median of yearly mean discharges, 303 ft'is (8.58 m'/s), 220,000 acre-ft/yr (271 hm'/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 140,000 ft'is (3,960 m'/s), Sept. 16, 1975, gage height, 33.9 ft (10.33 m), from rating curve extended above 4,000 ft'/s (113 m'/s) on basis of slope-area measurement; minimum discharge, 31 ft'is (0.878 m'/s), Apr. 19, 20, 1965. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 6,000 ft'/s (170 10/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) Nov. 27 1900 21,500 609 13.58 4.139 Sept. 23 1830 20,500 581 13.27 4.045 June 25 1845 9,460 268 9.08 2.768 Sept. 25 2100 9,110 258 8.91 2.716 Aug. 24 2100 *32,300 915 *16.65 5.075 Minimum discharge, 56 ft 3 /s (1.586 110/s), Apr. 10-12. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 167 496 348 145 107 84 77 106 99 187 94 975 2 288 265 676 151 107 86 70 85 94 173 91 553 3 350 239 430 138 107 81 69 77 91 163 94 401 4 257 217 300 135 106 77 70 72 90 165 99 348 5 193 184 485 131 103 74 72 74 88 183 92 303 6 163 172 520 131 102 74 111 66 80 175 90 267 7 669 172 354 130 100 76 81 65 81 149 90 289 8 1040 441 290 124 94 73 72 60 89 140 87 247 9 548 1320 261 123 93 74 65 96 82 134 85 226 10 610 594 235 121 94 75 58 611 73 152 287 232 11 934 304 219 116 91 75 58 468 357 138 188 244 12 668 324 207 116 99 75 78 199 867 153 111 468 13 330 292 195 115 105 75 76 141 700 136 99 259 14 285 277 183 128 120 75 67 128 265 145 239 262 15 285 594 179 138 100 73 72 157 174 119 191 455 16 341 464 180 115 94 74 136 135 146 159 133 475 17 236 323 177 124 91 79 100 106 132 352 123 462 18 217 244 172 118 105 76 116 96 120 253 252 847 19 244 216 194 114 95 72 118 91 260 147 154 684 20 212 196 202 111 92 71 150 89 177 126 261 847 21 235 194 183 111 90 70 136 86 272 184 239 854 22 439 187 170 110 91 68 332 83 401 135 154 1090 168 110 89 64 340 83 288 113 163 3550 23 240 208 447 109 67 85 106 2470 24 239 166 88 132 451 5570 623 110 67 91 110 2640 25 199 162 88 97 1470 5780 70 80 254 635 181 1220 2810 26 184 314 157 109 87 188 1840 27 175 3230 153 104 97 87 74 257 119 834 28 168 1910 151 96 92 90 218 229 405 101 865 1230 29 163 926 146 112 84 233 223 336 531 109 107 774 30 162 564 146 113 --- 88 156 146 215 104 461 533 31 810 --- 145 107 97 --- 111 --- 101 899 --- 2396 4710 MEAN 356 531 244 120 96.9 77.3 117 145 293 152 631 888 MAX 1040 3230 676 151 120 109 340 TOTAL 11051 15937 7554 3715 2811 3514 4501 8795 19576 26635 611 1470 352 5780 3550 MIN 162 172 145 96 84 64 58 60 73 101 85 226 AC-FT 21920 31610 14980 7370 5580 4750 6970 8930 17440 9340 38830 52830 CFSM 3.78 2.58 1.03 1.24 3.11 6.70 5.63 1.27 .82 1.54 1.61 9.41 IN. 4.36 6.29 2.98 1.47 1.11 .95 1.39 1.78 3.47 1.86 7.72 10.51 CAL YR 1987 TOTAL 86034 MEAN 236 MAX 3230 MIN 60 AC-FT 170600 CFSM 2.50 IN. 33.94 WTR YR 1988 TOTAL 111195 MEAN 304 MAX 5780 MIN 58 AC-FT 220600 CFSM 3.22 IN. 43.86 365 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 1987 TO SEPTEMBER 1988 DIS­ OXYGEN, COL1- STREP- CHARGE, SPE- DIS- FORM, TOCOCCI HARD­ INST. CIFIC SOLVED FECAL, FECAL, NESS CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- 0.7 KF AGAR TOTAL FEET DUCT- (STAND- ATURE BID- DIS- CENT UM-MF (COLS. (MG/L DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- (COLS./ PER AS SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) AT ION) 100 ML) 100 ML) CAC03) OCT 1987 01... 0955 170 229 7.40 25.0 6.6 8.4 101 1300 K560 100 JAN 1988 26... 1050 68 270 7.60 26.0 2.7 8.7 106 200 K170 110 APR 13... 0915 108 245 8.20 26.5 7.6 8.2 100 350 320 110 JUL 14... 1030 133 240 8.10 27.0 4.3 8.8 110 250 K190 110 HARD- ALKA- NESS MAGNE- SODIUM POTAS- LINITY CHLO- FLUO- SILICA, NONCARB CALCIUM SIUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, RIDE, DIS- WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET DIS- DIS- DIS- SOLVED TOT FLD SOLVED SOLVED SOLVED T1ON 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) 5102) OCT 1987 01... 4 26 9.0 9.1 0.4 2.1 98 8.9 6.3 0.1 1 JAN 1988 26... 1 28 10 10 0.4 1.8 100 11 7.8 0.1 il APR 13... 5 28 9.9 11 0.5 1.8 100 15 8.8 0.1 30 JUL 14... 5 27 9.5 10 0.4 1.5 89 14 7.3 0.1 30 SOLIDS, SOLIDS, NITRO- NITRO- NITRO- NITRO- PHOS- PHOS­ RESIDUE SUM OF SOLIDS, GEN, GEN, GEN, GEN,AM- PHOS- PHOROUS PHATE, AT 180 CONSTI- DIS- NO2+NO3 AMMONIA AMMONIA MONIA + PHOS- PHOROUS ORTHO, ORTHO, DEG. C TUENTS, SOLVED DIS- DIS- DIS- ORGANIC PHOROUS DIS- DIS- DIS­ DIS- DIS- (TONS SOLVED SOLVED SOLVED TOTAL TOTAL SOLVED SOLVED SOLVED DATE SOLVED SOLVED PER (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L (MG/L) (MG/L) DAY) AS N) AS N) AS NH4) AS N) AS P) AS P) AS P) AS PO4) OCT 1987 01... 152 152 70 0.64 0.03 0.04 1.0 0.03 0.04 0.02 0.07 JAN 1988 26... 169 166 31 0.71 0.03 0.04 0.4 J.05 0.04 0.03 0.09 APR 13... 167 170 50 0.42 0.03 0.04 0.8 0.07 0.07 0.05 0.15 JUL 14... 154 163 58 0.52 0.03 0.04 0.5 0.05 0.04 0.03 0.09 ALUM- BERYL- CHRO- INUM, ARSENIC BARIUM, LIUM, CADMIUM MIUM, COBALT, COPPER, IRON, LEAD, DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- DIS- SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED SOLVED DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS AL) AS AS) AS BA) AS BE) AS CD) AS CR) AS CO) AS CU) AS FE) AS PB) OCT 1987 01... 20 <1 38 <0.5 <1 <1 <3 1 18 <5 JAN 1988 26... 20 2 34 <0.5 <1 <1 <3 5 18 <5 APR 13... 20 <1 35 <0.5 <1 <1 <3 2 12 <5 JUL 14... 60 <1 35 <0.5 1 3 <3 6 35 5 K = non-ideal count 366 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 1987 TO SEPTEMBER 1988 MANGA- MOLYB- SELE- STROH- 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 1987 01... 5 37 <0.1 <10 ,1 <1 <1 130 <6 <3 JAN 1988 26... <4 18 0.1 <10 <1 <1 1 140 <6 12 APR 13... <4 10 <0.1 <10 <1 <1 1 150 9 <3 JUL 14... 10 20 1.2 <10 4 <1 1 140 <6 32 PARTICLE-SIZE DISTRIBUTION OF SUSPENDED SEDIMENT SED. SEDI- SUSP. MENT, SIEVE STREAM- SEDI- DIS- DIAM. FLOW, MENT, CHARGE, PERCENT INSTAN- SUS- SUS- FINER DATE TIME TANEOUS PENDED PENDED THAN (CFS) (MG/L) (T/DAY) .062 MM OCT 1987 01... 0955 170 24 18 65 JAN 1988 26... 1050 68 15 2.8 68 APR 13... 0915 108 24 7.0 45 JUL 14... 1030 133 22 8.0 63 367 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 ai (2.3 km) east-southeast from Anasco plaza. DRAINAGE AREA.--139 mi' (360 km') this does not include 39.7 mil (102.8 km?), flow is diverted to south coast. PERIOD OF RECORD.--Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 DIS- OXYGEN, OXYGEN COLI- STREP­ CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) SEP 1987 30... 1145 296 218 7.10 26.5 34 7.6 94 16 1500 K870 DEC 15... 1210 243 245 7.30 26.0 21 8.1 99 41 K260 I 440 FEB 1988 03... 1325 145 247 7.40 24.5 1.1 8.8 105 <10 K100 K120 APR 12... 1210 111 252 7.40 28.0 13 7.7 98 <10 270 K91 JUN 08... 1120 90.7 250 7.00 29.5 12 7.2 93 31 350 K64 AUG 03... 1015 120 254 6.90 27.0 4.3 7.1 87 18 K160 210 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM S1UM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE D1S- 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) SEP 1987 30... 95 6 24 8.5 9.0 0.4 2.2 89 <0.5 8.6 6.9 DEC 1987 15... 100 FEB 1988 03... 94 APR 12... 100 0 25 9.7 11 0.5 1.5 97 <0.5 14 8.5 JUN 08... 96 AUG 03... 100 0 26 9.0 10 0.4 1.6 99 11 7.2 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO-1 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) SEP 1987 30... 0.10 29 140 112 67 0.69 0.01 0.70 0.04 0.46 DEC 15... 54 0.79 0.01 0.80 0.03 0.57 FEB 1988 03... 0.59 0.01 0.60 0.01 0.19 APR 12... 0.10 31 166 48 19 0.09 0.01 0.10 0.01 0.19 JUN 08... 14 <0.01 0.10 0.02 AUG 03... 0.10 30 157 51 27 <0.01 0.30 0.02 0.58 K = non-ideal count 068 RIO GRANDE DE ANASCO BASIN 50146000 RIO GRANDE DE ANASCO NEAR ANASCO, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA t NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) SEP 1987 30... 0.5 1.2 2.4 0.03 <1 <100 60 1 9 20 DEC 15... 0.6 1.4 6.2 0.03 - FEB 1988 03... 0.2 0.8 3.5 0.04 APR 12... 0.2 0.3 2.9 0.05 <1 <100 <10 1 <1 650 JUN 08... <0.2 0.02 AUG 03... 0.6 0.9 4.0 0.03 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) SEP 1987 30... 4500 <5 190 <0.10 3 9 20 <0.010 4 0.01 DEC 15... FEB 1988 03... APR 12... 1000 <5 100 <0.10 <1 1 10 <0.010 <1 0.01 JUN 08... AUG 03... PESTICIDE ANALYSES CHLOR- DI- DI- ENDO- PCB, ALDRIN, DANE, DOD, DDE, DDT, AZINON, ELDRIN SULFAN, DATE TIME TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN 1988 08... 1120 <0.10 <0.01 <0.10 <0.01 <0.01 <0.01 0.05 <0.01 <0.01 HEPTA- METH- METHYL METHYL HEPTA- CHLOR MALA- OXY- PARA- TRI- ENDRIN, ETHION, CHLOR, EPDXIDE LINDANE THION, CHLOR, THION, THION, MIREX, DATE TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN 1988 08... <0.01 <0.01 <0.01 <0.01 <0.01 0.01 <0.01 <0.01 <0.01 <0.01 NAPH- THA- LENES, PARA- POLY- PER- TOX- TOTAL THION, CHLOR. THANE APHENE, TRI- 2,4-D, 2,4,5-T 2, 4-DP SILVEX, DATE TOTAL TOTAL TOTAL TOTAL THION TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN 1988 08... <0.01 <0.1 <0.10 <1 <0.01 <0.01 <0.01 <0.01 <0.01 AGUAD1LLA Drainage boundary untertain If 6uriyol, AGUADA R1NCON SAN S ASTIA1L R Guojetaco basin Coastal ba sin Coastal basin Rio Grande de AF,a sea basin EXPLANATION WELL AND WELL NUMBER MARC, CASVAS, —4 ML-E$ 1 1 1 3 4 5 6 KILOMETERS Figure 25.--Rio Culebrinas basin. 970 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 al' (150.7 km2 ). PERIOD OF RECORD.--Water years 1979 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 DIS- OXYGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) OCT 1987 01... 1355 70 268 7.70 26.5 3.6 8.7 108 10 1000 K450 DEC 16... 0730 104 268 7.30 23.5 6.6 7.4 86 33 4600 2700 FEB 1988 04... 0805 54 336 7.40 22.5 6.1 6.7 77 12 21000 48000 APR 13... 1435 18 477 7.40 30.0 2.8 6.6 87 210 K650 K40 JUN 09... 0800 76 320 7.00 25.0 23 6.8 82 21 K10000 5300 AUG 04... 0800 115 232 6.50 24.5 93 7.2 86 15 K66000 40000 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SIUM, SODIUM, AD- S1UM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) OCT 1987 01... 110 12 36 5.3 12 0.5 2.3 100 <0.5 10 9.7 DEC 16... 130 FEB 1988 04... 130 APR 13... 140 0 42 7.7 43 2 15 170 <0.5 21 26 JUN 09... 120 AUG 04... 91 4 29 4.4 9.9 0.5 2.7 75 12 9.2 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO20403 AMMONIA ORGANIC SOLVED (MG/L DIS- (TONS SUS- TOTAL TOTAL TOTAL TOTAL TOTAL DATE (MG/L AS SOLVED PER PENDED (MG/L (MG/L (MG/L (MG/L (MG/L AS F) $102) (MG/L) DAY) (MG/L) AS N) AS N) AS N) AS N) AS N) OCT 1987 01... 0.10 33 168 168 1 1.14 0.06 1.20 0.04 DEC 16... 14 1.14 0.06 1.20 0.10 0.20 FEB 1988 04... 32 0.66 0.04 0.70 0.09 0.41 APR 13... 0.20 40 303 303 10 0.94 0.26 1.20 1.70 0.90 JUN 09... 29 0.74 0.06 0.80 0.06 0.34 AUG 04... 0.10 21 140 140 121 0.84 0.06 0.90 0.10 0.7,0 K = non-ideal count RIO CULEBRINAS BASIN 50147600 RIO CULEBRINAS NEAR SAN SEBASTIAN, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) OCT 1987 01... <0.2 0.15 <1 <100 20 1 8 20 DEC 16... 0.3 1.5 6.6 0.08 FEB 1988 04... 0.5 1.2 5.3 0.09 APR 13... 2.6 3.8 17 0.85 3 <100 70 1 <1 220 JUN 09... 0.4 1.2 5.3 0.08 AUG 04... 0.4 1.3 5.8 0.07 MANGA- METHY- IRON, LEAD, NESE, MERCURY SILVER, ZINC, LENE TOTAL TOTAL TOTAL TOTAL SELE- TOTAL TOTAL BLUE RECOV- RECOV- RECOV- RECOV- NIUM, RECOV- RECOV- CYANIDE ACTIVE ERABLE ERABLE ERABLE ERABLE TOTAL ERABLE ERABLE TOTAL PHENOLS SUB- DATE (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L (MG/L TOTAL STANCE AS FE) AS PB) AS MN) AS HG) AS SE) AS AG) AS ZN) AS CN) (UG/L) (MG/L) OCT 1987 01... 290 <5 30 <0.10 3 <1 <10 <0.010 4 0.01 DEC 16... FEB 1988 04... APR 13... 330 <5 210 <0.10 <1 1 130 <0.010 <1 0.10 JUN 09... AUG 04... 371 372 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 mil (184.4 km'). WATER-DISCHARGE RECORDS PERIOD OF RECORD.--July 1967 to current year. GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 45 ft (14 m), from topographic map. REMARKS.--Records fair except those for estimated daily discharges, which are poor. AVERAGE DISCHARGE.--21 years (1968-88), 305 ft'/s (8.638 m'/s), 58.17 in/yr (1,478 mm/yr), 221,000 acre-ft/yr (272 he/yr); median of yearly mean discharges. 290 ft'/s (8.21 m'/s), 210,000 acre-ft/yr (260 he/yr). EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 69,000 fti/s (1,950 m'/s), Sept. 16, 1975, gage height, 36.6 ft (11.16 m) from slope-area measurement, but may have been exceeded by flood of Oct. 23, 1974, from rating curve extended above 2.600 ft'/s (73.6 m'/s) on basis of slope-area and contracted-opening measurements of peak flow; minimum discharge, 16 ft'/s (0.453 40/s), Apr. 17-19, 1979. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 11,300 ft'is (320 m 3/s) and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft'/s) (m'/s) (ft) (m) Date Time (W/s) (m'/s) (ft) (m) Oct. 7 2100 25,800 731 27.78 8.467 Aug. 14 2315 13,300 377 23.39 7.129 Nov. 27 unknown 11,300 320 22.46 6.846 Aug. 24 2330 *42,300 1,200 *31.82 9.699 May 26 2015 14,300 405 23.82 7.260 Sept. 2 2015 11,600 328 22.61 6.892 June 24 1845 14,500 411 23.89 7.282 Sept. 20 2045 20,000 566 25.97 7.916 July 26 1830 14.000 396 23.69 7.221 Minimum discharge, 21 ft'/s (0.595 m'/s), Apr. 9, 10. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 106 e85 e200 115 51 38 26 171 191 206 110 963 2 152 e80 e1100 132 57 36 27 79 152 204 104 2310 3 222 e73 253 83 54 36 28 103 129 407 136 502 4 1260 e86 93 73 82 34 26 110 115 265 181 324 5 252 e76 74 70 55 31 26 83 103 1130 114 281 6 200 e205 e300 70 50 33 26 60 93 351 205 254 7 5040 e125 e700 67 48 31 26 51 86 212 345 295 8 e700 e116 128 64 45 33 25 46 89 181 147 267 9 e300 e96 88 64 47 30 22 53 109 163 117 232 10 e220 e83 76 64 47 31 24 70 78 155 111 284 11 e360 e74 69 62 48 29 23 587 271 149 108 262 12 e250 e73 214 64 64 30 26 341 235 135 108 408 13 e290 e158 196 62 59 28 32 236 389 320 101 269 14 e340 e90 75 64 52 32 29 289 373 194 1570 493 15 e250 e80 103 60 46 30 34 148 243 151 1040 251 16 e390 e73 77 62 46 29 124 944 241 125 186 207 17 e200 e107 71 64 44 33 53 267 565 133 177 192 18 e180 e146 64 65 44 30 127 134 244 211 465 189 19 e175 011 163 63 40 29 148 103 150 140 192 186 20 e150 e87 130 59 42 30 403 141 157 117 312 3430 21 e145 e78 96 58 40 27 378 133 146 114 323 606 22 e122 e74 79 55 40 28 197 1150 444 120 218 840 23 e120 e72 72 57 38 24 121 373 263 102 170 910 24 118 e426 69 55 40 27 69 274 2200 97 6750 383 25 457 e708 76 53 40 27 70 164 677 112 e1500 320 26 e161 e230 67 54 38 24 95 2440 519 2900 e1100 693 27 e158 e4880 64 54 48 48 73 498 346 243 e1400 318 28 el50 e1240 61 52 44 56 71 487 522 143 e1300 255 29 e348 e394 60 54 39 47 197 392 511 137 e800 399 30 e203 e258 61 54 --- 37 264 1070 264 144 e600 241 31 e153 --- 80 52 30 --- 326 --- 119 509 --- TOTAL 13172 10384 4959 2025 1388 1008 2790 11323 9905 9180 20499 16564 MEAN 425 346 160 65.3 47.9 32.5 93.0 365 330 296 661 552 MAX 5040 4880 1100 132 82 56 403 2440 2200 2900 6750 3430 MIN 106 72 60 52 38 24 22 46 78 97 101 186 AC-FT 26130 20600 9840 4020 2750 2000 5530 22460 19650 18210 40660 32850 CFSM 5.97 4.86 2.25 .92 .67 .46 1.31 5.13 4.64 4.16 9.29 7.75 IN. 6.88 5.43 2.59 1.06 .73 .53 1.46 5.92 5.18 4.80 10.71 8.65 TOTAL 80980 MEAN 222 MAX 5490 MIN 32 AC-FT 160600 CFSM 3.12 IN. 42.31 CAL YR 1987 TOTAL 103197 MEAN 282 MAX 6750 MIN 22 AC-FT 204700 CFSM 3.96 IN. 53.92 WTR YR 1988 e Estimated 373 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 1987 TO SEPTEMBER 1988 STREAMFLOW, SPECIFIC CON- TEMPERA- STREAMFLOW, SPECIFIC CON- TEMPERA- DATE TIME INSTANTANEOUS DUCTANCE TURE DATE TIME INSTANTANEOUS DUCTANCE TURF (CFS) (UMHOS) (DEG C) (CFS) (UMHOS) (DEG C) OCT, 23 1107 121 150 26.5 APR, 13 1920 39.6 301 26.5 DEC, 15 1414 163 312 25.0 MAY, 04 0852 117.3 273 25.0 JAN, 14 0933 65.7 270 23.5 JUN, 07 0851 86.5 324 27.5 FEB, 16 1159 43.5 259 24.0 JUL, 12 0942 135.9 293 27.0 MAR, 09 1014 30.7 337 23.5 AUG, 02 0921 105.4 250 25.5 I 374 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 i (3.7 km) northeast of Aguada plaza. DRAINAGE AREA.--97.0 mil (251.2 km'). PERIOD OF RECORD.--Water years 1958, 1970 to current year. WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 DIS- OXfGEN, OXYGEN COLI- STREP- CHARGE, SPE- DIS- DEMAND, FORM, TOCOCCI INST. CIFIC SOLVED CHEM- FECAL, FECAL, CUBIC CON- PH TEMPER- TUR- OXYGEN, (PER- ICAL 0.7 KF AGAR FEET DUCT- (STAND- ATURE BID- DIS- CENT (HIGH UM-MF (COLS. DATE TIME PER ANCE ARD WATER ITY SOLVED SATUR- LEVEL) (COLS./ PER SECOND (US/CM) UNITS) (DEG C) (NTU) (MG/L) ATION) (MG/L) 100 ML) 100 ML) SEP 1987 30... 0835 168 272 7.20 25.5 22 7.0 85 14 K8000 52000 DEC 15... 0900 248 345 7.10 25.0 31 7.1 84 56 K10000 K10000 FEB 1988 03... 1010 26 340 7.00 26.5 4.9 3.2 40 29 20000 86000 APR 12... 0900 23 450 6.70 30.0 6.9 0.1 1 97 45000 K190000 JUN 08... 0825 168 370 7.10 27.5 13 7.3 91 21 K300 K300 AUG 03... 0745 E50 345 6.70 26.0 17 6.6 80 29 K910 2200 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY CHLO- NESS NONCARB CALCIUM SIUM, SODIUM, AD- SLUM, WAT WH SULFATE RIDE, TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET SULFIDE DIS- DIS- (MG/L TOT FLD SOLVED SOLVED SOLVED TION SOLVED FIELD TOTAL SOLVED SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L (MG/L (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS S) AS SO4) AS CL) SEP 1987 30... 130 17 42 5.4 12 0.5 2.3 110 <0.5 10 11 DEC 15... 140 FEB 1988 03... 140 APR 12... 180 0 54 11 24 0.8 14 180 <0.5 17 22 JUN 08... 140 AUG 03... 140 3 48 6.1 13 0.5 2.4 130 11 13 SOLIDS, RESIDUE FLUO- SILICA, SUM OF SOLIDS, TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- RIDE, DIS- CONSTI- DIS- AT 105 GEN, GEN, GEN, GEN, GEN, DIS- SOLVED TUENTS, SOLVED DEG. C, NITRATE NITRITE NO2,4403 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) SEP 1987 30... 0.10 28 180 82 37 0.78 0.02 0.80 0.03 0.17 DEC 15... 63 0.86 0.04 0.90 0.09 1.5 FEB 1988 03... 14 0.27 0.03 0.30 0.03 0.77 APR 12... 0.20 45 311 19 15 0.01 <0.10 0.05 3.1 JUN 08... 20 0.59 0.01 0.60 0.07 0.23 AUG 03... 0.10 29 208 0.0 19 0.78 0.02 0.80 0.10 0.70 K = non-ideal count E = estimate 375 RIO CULEBRINAS BASIN 50149100 RIO CULEBRINAS NEAR AGUADA, PR--Continued WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 NITRO- CHRO- GEN,AM- BARIUM, BORON, CADMIUM MIUM, COPPER, MONIA + NITRO- NITRO- PHOS- TOTAL TOTAL TOTAL TOTAL TOTAL ORGANIC GEN, GEN, PHOROUS ARSENIC RECOV- RECOV- RECOV- RECOV- RECOV- TOTAL TOTAL TOTAL TOTAL TOTAL ERABLE ERABLE ERABLE ERABLE ERABLE DATE (MG/L (MG/L (MG/L (MG/L (UG/L (UG/L (UG/L (UG/L (UG/L (UG/L AS N) AS N) AS NO3) AS P) AS AS) AS BA) AS B) AS CD) AS CR) AS CU) SEP 1987 30... 0.2 1.0 3.1 0.05 1 <100 10 1 4 20 DEC 15... 1.6 2.5 11 0.06 FEB 1988 03... 0.8 1.1 4.9 0.12 APR 12... 3.2 1.1 2 <100 40 3 <1 200 JUN 08... 0.3 0.90 4.0 0.06 AUG 03... 0.8 1.6 7.1 0.08 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) SEP 1987 30... 1300 <5 70 <0.10 2 1 10 <0.010 1 0.01 DEC 15... FEB 1988 03... APR 12... 3100 <5 790 <0.10 <1 1 30 <0.010 4 0.08 JUN 08... AUG 03... PESTICIDE ANALYSES CHLOR- DI- DI- ENDO- PCB, ALDRIN, DANE, DOD, DDE, DDT, AZINON, ELDRIN SULFAN, DATE TIME TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN 1988 08... 0825 <0.10 <0.01 <0.10 <0.01 <0.01 <0.01 0.03 <0.01 <0.01 HEPTA- METH- METHYL METHYL HEPTA- CHLOR MALA- OXY- PARA- TRI- ENDRIN, ETHION, CHLOR, EPDXIDE LINDANE THION, CHLOR, THION, THION, MIREX, DATE TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN 1988 08... <0.01 <0.01 <0.01 <0.01 <0.01 0.01 <0.01 <0.01 <0.01 <0.01 NAPH- THA- LENES, PARA- POLY- PER- TOX- TOTAL THION, CHLOR. THANE APHENE, TRI- 2,4-D, 2,4,5-T 2, 4-DP SILVEX, DATE TOTAL TOTAL TOTAL TOTAL THION TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) JUN 1988 08... <0.01 <0.1 <0.10 <1 <0.01 <0.01 <0.01 <0.01 <0.01 376 THIS PAGE WAS LEFT BLANK INTENTIONALLY Water-Quality at Partial-Record Stations in Puerto Rico 378 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 1987 TO SEPTEMBER 1988 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 10... 0725 1.00 229 8.60 28.6 54 9.8 128 K4 MAR 1988 07... 1105 1.00 309 7.80 26.0 51 6.1 76 K2 JUL 21... 0910 1.00 256 7.60 29.4 59 7.5 99 KID RIO GRANDE DE ARECIBO BASIN 50025110 LAGO DOS BOCAS NO.3 AT WEST BRANCH NR UTUADO,PR (LAT 18'19 1 15"N LONG 066°40'11"W) NOV 1987 12... 0945 1.00 216 8.30 29.2 33 8.4 111 96 MAR 1988 09... 1005 1.00 232 7.60 26.3 43 6.8 84 K13 JUL 07... 0910 1.00 232 8.30 29.7 13 7.9 103 K960 RIO DE LA PLATA BASIN 50039900 LAGO CARITE NO.3 ON RIO DE LA PLATA NR CAYEY,PR (LAT 18°05'04"N LONG 066'06'03"W) NOV 1987 13... 1040 1.00 94 6.90 27.6 74 6.7 90 K17 MAR 1988 03... 1040 1.00 91 7.60 22.9 78 7.5 92 K26 JUL 13... 1000 1.00 103 7.40 27.6 50 7.3 97 102 50044400 LAGO LA PLATA NO.5 NR MOUTH NR NARANJITO, PR (LAT 18'19'33"N LONG 066'12'28"W) NOV 1987 05... 1040 1.00 346 8.10 28.1 37 11.4 145 K2 MAR 1988 04... 1035 1.00 338 8.80 25.9 12 12.8 157 K25 JUL 12... 0905 1.00 278 6.70 29.7 22 6.4 87 K130 RIO GRANDE DE LOIZA BASIN 50057500 LAGO LOIZA NO.4 NR MOUTH NR CAGUAS, PR (LAT 18'16 . 51"N LONG 066'00 1 35"W) NOV 1987 06... 0940 1.00 248 7.10 28.7 18 4.1 53 K68000 MAR 1988 03... 1135 1.00 278 8.30 27.6 14 11.2 141 84 JUL 11... 1200 1.00 231 7.10 30.0 7 4.1 54 K15000 K = non-ideal count 379 ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATIONS WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 STREP- ALKA- RESIDUE TOCOCCI LINITY TOTAL NITRO- NITRO- NITRO- NITRO- NITRO- FECAL, WAT WH AT 105 GEN, GEN, GEN, GEN, GEN, KF AGAR TOT FET 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) 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 10... 23 99 1 <0.01 <0.10 0.03 1.6 MAR 1988 07... K25 140 2 <0.01 <0.10 <0.01 JUL 21... K12 120 12 <0.01 <0.10 <0.01 RIO GRANDE DE ARECIBO BASIN--CONTINUED 50025110 LAGO DOS BOCAS NO.3 AT WEST BRANCH NR UTUADO,PR (LAT 18°19'15"N LONG 066°40'11"W) NOV 1987 12... 52 80 3 0.39 0.01 0.40 <0.01 MAR 1988 09... K600 75 1 0.47 0.03 0.50 0.01 0.29 JUL 07... 110 81 10 0.19 0.01 0.20 0.01 0.79 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 1987 13... 50 30 2 <0.01 <0.10 <0.01 MAR 1988 03... K21 32 1 <0.01 <0.10 0.02 0.28 JUL 13... 28 33 5 <0.01 <0.10 0.04 0.26 50044400 LAGO LA PLATA NO.5 NR MOUTH NR NARANJITO, PR (LAT 18°19'33'N LONG 066°12'28"W) NOV 1987 05... K2 120 <1 0.65 0.05 0.70 0.04 0.36 MAR 1988 04... K44 140 13 0.17 0.03 0.20 0.02 0.28 JUL 12... 32 100 0.46 0.04 0.50 0.01 0.19 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 1987 06... 4500 82 51 0.44 0.06 0.50 0.64 0.46 MAR 1988 03... 96 93 3 0.40 0.10 0.50 0.01 0.59 JUL 11... 240 69 0.43 0.07 0.50 0.60 0.0 K = non-ideal count 380 ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATIONS WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 NITRO- CHLOR-A CHLOR-B GEN,AM- PHYTO- PHYTO- MONIA t NITRO- NITRO- PHOS- PLANK- PLANK- PLANK- PLANK- ORGANIC GEN, GEN, PHOROUS TON TON TON TON TOTAL TOTAL TOTAL TOTAL CHROMO CHROMO BIOMASS BIOMASS DATE (MG/L (MG/L (MG/L (MG/L FLUOROM FLUOROM ASH WT DRY WT AS N) AS N) AS NO3) AS P) (UG/L) (UG/L) (MG/L) (MG/L) RIO GUAJATACA BASIN--CONTINUED 50010720 LAGO GUAJATACA NO.3 NR MOUTH NR QUEBRADILLAS,PR (LAT 1822'05"N LONG 066- 54'36"W) NOV 10... 1.6 - 0.04 78.0 0.80 13 280 MAR 1988 07... 0.4 - 0.01 14.0 0.50 3.0 260 JUL 21... 0.7 0.04 33.0 0.90 4.5 250 RIO GRANDE DE ARECIBO BASIN--CONTINUED 50025110 LAGO DOS BOCAS NO.3 AT WEST BRANCH NR UTUADO,PR (LAT 18- 19'15"N LONG 066'40'11"W) NOV 1987 12... 0.4 0.8 3.5 0.02 12.0 1.20 6.7 280 MAR 1988 09... 0.3 0.8 2.6 0.01 9.90 0.50 2.9 260 JUL 07... 0.8 1.0 4.4 0.04 3.50 ,0.10 3.4 280 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 1987 13... 0.2 - 0.02 4.80 0.70 2.6 250 MAR 1988 3... 0.3 -- 0.02 12.0 2.70 7.0 640 JUL 13... 0.3 0.01 3.40 0.40 0.2 260 50044400 LAGO LA PLATA NO.5 NR MOUTH NR NARANJITO, PR (LAT 1819'33"N LONG 066'12'28"W) NOV 1987 5... 0.4 1.1 4.9 0.12 25.0 1.30 7.8 240 MAR 1988 4... 0.3 0.5 2.2 0.15 110 1.90 8.8 280 JUL 12... 0.2 0.7 3.1 0.18 9.40 1.90 3.6 260 RIO GRANDE DE LOIZA BASIN--CONTINUED 50057500 LAGO LOIZA NO.4 NR MOUTH NR CAGUAS, PR (LAT 18'16'51"N LONG 066-001 35"W) NOV 1987 6... 1.1 1.6 7.1 0.33 3.70 0.80 12 340 MAR 1988 03... 0.6 1.1 4.9 0.27 120 2.40 11 270 JUL 11... 0.6 1.1 4.9 0.33 381. ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATIONS WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 DEPTH OXYGEN, COLI- STREP- AT SPE- TRANS- DIS- FORM, TOCOCCI SAMPLE CIFIC PAR- SOLVED FECAL, FECAL, LOC- CON- PH TEMPER- ENCY OXYGEN, (PER- 0.7 KF AGAR ATION, DUCT- (STAND- ATURE (SECCHI DIS- CENT UM-MF (COLS. DATE TIME TOTAL ANCE ARD WATER DISK) SOLVED SATUR- (COLS./ PER (FEET) (US/CM) UNITS) (DEG C) (IN) (MG/L) ATION) 100 ML) 100 ML) RIO GUAJATACA BASIN--CONTINUED 50010790 LAGO GUAJATACA NO.1 NR DAM NR QUEBRADILLAS,PR (LAT 18'23 1 56"N LONG 066'55'23"W) NOV 1987 10... 0700 1.00 253 8.10 28.3 65 7.1 91 114 K19 10... 0640 31.0 283 7.10 25.9 -- 0.0 0 -- MAR 1988 07... 1025 1.00 296 8.20 26.2 53 6.7 83 K8 196 07... 1010 65.0 312 7.10 24.9 -- 0.2 2 -- -- JUL 21... 0950 1.00 259 7.70 29.7 68 8.3 110 46 240 21... 0955 70.0 316 6.50 25.1 1.2 16 -- -- 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 1987 09... 1045 1.00 134 8.00 24.9 56 8.1 106 52 560 09... 1040 93.0 190 6.70 21.1 -- 0.0 0 -- -- MAR 1988 08... 0945 1.00 137 7.30 22.7 72 5.8 72 K4 Kll 08... 1000 92.0 141 6.90 21.3 -- 0.0 0 -- -- JUL 06... 1150 1.00 149 7.50 25.1 26 9.0 118 192 25 06... 1140 73.0 208 7.00 21.2 -- 2.0 26 -- 50027090 LAGO DOS BOCAS NO.1 NR DAM NR UTUADO,PR (LAT 18°20'09"N LONG 066°40'04"W) NOV 1987 12... 1040 1.00 197 8.30 28.8 56 8.7 114 K8 72 12... 1020 76.0 184 6.70 26.8 -- 0.5 6 -- MAR 1988 09... 1050 1.00 216 7.50 26.5 88 5.8 72 21 26 09... 1045 75.0 196 6.80 24.6 -- 0.9 11 -- JUL 07... 1000 1.00 224 8.50 30.6 50 8.7 115 K35 K9 07... 0950 75.0 218 6.80 27.3 1.0 13 -- -- RIO DE LA PLATA BASIN--CONTINUED 50039950 LAGO CARITE NO.1 NR DAM NR CAYEY, P.R. (LAT 18°04'39"N LONG 066'06'19"W) NOV 1987 13... 1000 1.00 98 7.30 27.0 101 7.8 103 K6 K5 13... 0950 70.0 211 6.30 23.3 0.0 0 -- -- MAR 1988 03... 1000 1.00 90 7.80 23.0 77 7.6 93 K7 K7 03... 1015 72.0 97 7.00 21.8 0.7 8 -- -- JUL 13... 0935 1.00 102 7.60 28.1 56 7.4 99 164 29 13... 0930 68.0 136 6.60 22.7 -- 1.2 16 -- -- 50044950 LAGO LA PLATA NO.3 NR DAM NR NARANJITO, PR (LAT 18°20'18"N LONG 066°14'01"W) NOV 1987 05... 0920 1.00 296 7.50 28.1 88 5.1 65 K10 K16 05... 0925 77.0 208 6.80 24.0 -- 0.0 0 -- MAR 1988 04... 0920 1.00 317 7.60 25.7 39 6.3 77 K5 60 04... 0915 77.0 184 6.70 23.7 0.1 1 -- -- JUL 12... 1000 1.00 275 7.20 29.9 62 5.0 66 K9 K42 12... 0950 66.0 264 6.70 23.9 -- 1.0 13 -- -- 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 1987 06... 0845 1.00 197 7.20 28.9 28 5.4 70 K64 K47 06... 0900 45.0 139 6.60 26.3 0.0 0 -- -- MAR 1988 03... 1045 1.00 276 7.30 26.4 28 4.3 53 K11 K33 03... 1050 39.0 252 6.80 25.4 -- 0.4 5 -- JUL 11... 1110 1.00 171 7.10 29.7 24 4.3 56 250 K30 11... 1100 40.0 167 6.70 27.0 1.4 18 -- -- K = non-ideal count 382 ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATIONS WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 10 SEPTEABER 1988 HARD- ALKA- HARD- NESS MAGNE- SODIUM POTAS- LINITY NESS NONCARB CALCIUM SLUM, SODIUM, AD- SIUM, WAT WH SULFATE TOTAL WH WAT DIS- DIS- DIS- SORP- DIS- TOT FET DIS- (MG/L TOT FLO SOLVED SOLVED SOLVED TION SOLVEL FIELD SOLVED DATE AS MG/L AS (MG/L (MG/L (MG/L RATIO (MG/L MG/L AS (MG/L CAC03) CAC03 AS CA) AS MG) AS NA) AS K) CAC03 AS SO4) RIO GUAJATACA BASIN--CONTINUED 50010790 LAGO GUAJATACA NO.1 NR DAM NR QUEBRADILLAS,PR (LAT 18°23'56"N LONG 066*55'23"W) NOV 1987 10... 120 4 44 3.4 5.5 0.2 2.0 140 11 10... 140 2 51 3.4 5.1 0.2 2.1 120 11 MAR 1988 07... 140 0 50 3.6 5.8 0.2 2.1 140 11 07... 140 0 52 3.6 5.7 0.2 2.0 130 11 JUL 21... 130 14 45 3.6 5.5 0.2 1.8 110 11 21... 150 3 55 3.5 4.9 0.2 1.7 140 9.2 RIO GRANDE OE ARECIBO BASIN--CONTINUED 50020050 LAGO GARZAS NO.1 NR DAM NR ADJUNTAS,PR (LAT 18°08'21"N LONG 066°44'35"W) NOV 1987 09... 55 0 15 4.2 6.2 0.4 1.7 59 4.4 09... 81 0 23 5.8 6.3 0.3 1.7 110 9.1 MAR 1988 08... 56 0 16 4.0 5.7 0.3 1.2 56 3.9 08... 57 0 16 4.1 5.3 0.3 1.2 64 4.0 JUL 06... 60 0 16 4.9 6.7 0.4 1.2 61 5.0 06... 68 0 19 5.0 6.0 0.3 1.3 82 2.4 50027090 LAGO DOS BOCAS NO.1 NR DAM NR UTUADO,PR (LAT 18°20'09"N LONG 066°40'04"W) NOV 1987 12... 75 1 20 6.1 10 0.5 2.3 74 14 12... 68 6 18 5.5 9.1 0.5 2.7 62 11 MAR 1988 09... 78 0 21 6.1 11 0.6 2.1 73 17 09... 75 0 20 6.2 9.9 0.5 2.0 74 13 JUL 07,., 86 2 23 7.0 11 0.5 2.1 80 16 07... 85 4 23 6.7 9.8 0.5 2.4 88 11 RIO DE LA PLATA BASIN--CONTINUED 50039950 LAGO CARITE NO.1 NR DAM NR CAYEY, P.R. (LAT 18'04 1 39"N LONG 066°06'19"W) NOV 1987 13... 30 0 6.2 3.6 8.4 0.7 1.5 32 3.7 13... 45 0 10 4.9 8.3 0.6 1.3 82 15 MAR 1988 03... 29 0 5.7 3.5 7.9 0.7 0.8 30 3.6 03... 28 0 5.8 3.4 7.4 0.6 0.9 - 34 4.9 JUL 13... 31 0 6.2 3.8 8.0 0.6 0.8 34 3.8 13... 36 0 7.6 4.2 9.3 0.7 1.7 49 13 50044950 LAGO LA PLATA NO.3 NR DAM NR NARANJITO, PR (LAT 18'20'18"N LONG 066°14'01"W) NOV 1987 05... 120 11 27 13 24 1 2.4 110 14 05... 83 0 20 8.0 11 0.5 2.8 98 10 MAR 1988 04... 120 0 29 12 19 0.8 2.1 130 14 04... 70 0 17 6.6 9.9 0.5 2.7 74 13 JUL 12... 100 0 24 10 18 0.8 1.9 110 15 12... 97 1 23 9.7 12 0.5 2.5 90 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°00'47"W) NOV 1987 06... 63 2 15 6.1 16 0.9 3.2 61 15 06... 49 0 12 4.7 11 0.7 3.4 63 15 MAR 1988 03... 75 0 18 7.4 17 0.9 3.0 91 17 03... 83 0 20 8.1 20 1 2.5 85 16 JUL 11... 46 6 11 4.5 11 0.7 2.9 45 15 11... 50 5 12 4.9 12 0.8 2.7 43 20 383 ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATIONS WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 SOLIDS, RESIDUE CHLO- FLUO- SILICA, SUM OF TOTAL NITRO- NITRO- NITRO- NITRO- RIDE. RIDE, DIS- CONSTI- AT 105 GEN, GEN. GEN, GEN, DIS- DIS- SOLVED TUENTS, DEG. C, NITRATE NITRITE NO2+NO3 AMMONIA SOLVED SOLVED (MG/L DIS- SUS- TOTAL TOTAL TOTAL TOTAL DATE (MG/L (MG/L AS SOLVED PENDED (MG/L (MG/L (MG/L (MG/L AS CL) AS F) SI02) (MG/L) (MG/L) AS N) AS N) AS N) AS N) RIO GUAJATACA BASIN--CONTINUED 50010790 LAGO GUAJATACA NO.1 NR DAM NR QUEBRADILLAS,PR (LAT 18'23'56"N LONG 066'55'23"W) NOV 1987 10... 10 0.1 6.5 154 3 <0.01 <0.10 0.01 10... 10 0.1 7.7 174 -- MAR 1988 07... 8.4 0.2 6.9 172 3 <0.01 <0.10 <0.01 07... 8.3 0.2 7.9 178 JUL 21... 8.4 0.1 7.2 150 6 <0.01 <0.10 <0.01 21... 7.8 0.2 7.3 179 -- 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 1987 09... 6.3 0.1 16 89 3 <0.01 <0.10 <0.01 09... 5.7 0.1 21 139 -- MAR 1988 08... 5.3 0.1 17 90 4 0.09 0.01 0.10 <0.01 08... 5.2 0.1 17 95 JUL 06... 5.6 0.2 18 96 6 <0.01 <0.10 <0.01 06... 5.3 0.2 20 100 -- 50027090 LAGO DOS BOCAS NO.1 NR DAM NR UTUADO,PR (LAT 18°20'09"N LONG 066'40 1 04"W) NOV 1987 12... 12 0.1 22 131 1 <0.01 0.20 0.02 12... 11 0.1 21 116 -- MAR 1988 09... 11 0.2 21 137 1 0.48 0.02 0.50 <0.01 09... 9.7 0.2 22 129 -- -- -- -- JUL 07... 10 0.2 22 142 6 <0.01 <0.10 <0.01 07... 9.8 0.2 21 132 -- RIO DE LA PLATA BASIN--CONTINUED 50039950 LAGO CARITE NO.1 NR DAM NR CAYEY, P.R. (LAT 18°04'39"N LONG 066°06 1 19"W) NOV 1987 13... 11 0.1 17 71 4 <0.01 <0.10 <0.01 13... 12 0.1 22 123 -- MAR 1988 03... 8.2 0.1 17 66 5 <0.01 <0.10 0.02 03... 8.4 0.1 18 68 JUL 13... 9.8 0.1 18 89 3 <0.01 <0.10 0.06 13... 8.5 0.1 17 69 -- 50044950 LAGO LA PLATA NO.3 NR DAM NR NARANJITO, PR (LAT 18°20'18"N LONG 066°14'01"W) NOV 1987 05... 21 0.2 18 186 <1 <0.01 <0.10 0.05 05... 11 0.2 20 142 -- MAR 1988 04... 21 0.2 19 191 2 0.18 0.02 0.20 0.01 04... 12 0.2 18 123 JUL 12... 18 <0.1 20 168 7 0.02 <0.10 <0.01 12... 13 <0.1 21 154 -- RIO GRANDE DE LOIZA BASIN--CONTINUED 50058800 LAGO LOIZA NO.7 NR DAM NR TRUJILLO ALTO, PR (LAT 18'19 1 29"N LONG 066'00'47"W) NOV 1987 06... 16 0.2 22 130 6 0.48 0.02 0.50 0.04 06... 10 0.2 18 112 -- -- -- -- MAR 1988 03... 22 0.2 20 165 5 0.43 0.07 0.50 0.21 03... 19 0.2 21 153 -- -- -- -- JUL 11... 12 0.1 16 96 427 0.64 0.06 0.70 0.14 11... 13 0.1 5.0 97 -- ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATIONS WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 NITRO- CHLOR-A CHLOR-8 NITRO- GEN,AM- PHY10- PHYTO- GEN, MONIA r NITRO- NITRO- PHOS- PLANK- PLANK- PLANK- PLANK- ORGANIC ORGANIC GEN, GEN, PHOROUS TON ION 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 NOV 1987 10... 10... MAR 1988 07... 7... JUL 21... 21... LAGO GUAJATACA NO.1 NR DAM NR QUEBRADILLAS,PR (LAT 0.69 0.7 <0.01 16.0 -- 0.4 <0.01 9.60 -- 0.8 0.02 16.0 18°23'56"N LONG 066°55'23"W) 0.30 15 210 -- 0.10 3.5 260 -- -- -- 0.40 4.3 250 -- -- 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 1987 09... 0.3 <0.01 15.0 0.70 9.7 280 09... -- -- MAR 1988 8... - 0.3 0.4 1.8 0.04 8.90 1.60 2.8 260 08... -- -- JUL 06... 0.4 0.02 20.0 3.40 4.2 260 06... -- -- -- 50027090 LAGO DOS BOCAS NO.1 NR DAM NR UTUADO,PR (LAT 18°20'09"N LONG 066°40'04"W) NOV 1987 12... 0.28 0.3 0.5 2.2 0.02 5.80 0.50 7.9 280 12... -- -- -- -- MAR 1988 09... 0.3 0.8 3.5 0.01 5.10 0.40 2.2 250 09... .... -- -- JUL 07... <0.2 0.01 13.0 0.70 2.7 250 07... -- -- RIO DE LA PLATA BASIN--CONTINUED 50039950 LAGO CARITE NO.1 NR DAM NR CAYEY, P.R. (LAT 18°04'39"N LONG 066°06'19"W) NOV 1987 13... 0.3 0.02 7.10 1.10 3.6 260 13... -- -- MAR 1988 03... <0.2 0.02 13.0 3.70 6.0 510 03... -- -- -- JUL 13... 0.24 0.3 0.01 4.30 0.30 1.4 260 13... -- -- 50044950 LAGO LA PLATA NO.3 NR DAM NR NARANJITO, PR (LAT 18'20 1 18"N LONG 066'14 101"W) NOV 1987 05... 0.45 0.5 0.04 14.0 2.10 7.4 260 05... -- -- -- MAR 1988 04... 0.49 0.5 0.7 3.1 0.09 42.0 5.80 4.6 260 04... -- -- -- -- -- JUL 12... <0.2 0.05 7.40 1.30 2.2 250 12... -- -- -- RIO GRANDE DE LOIZA BASIN-CONTINUED 50058800 NOV 1987 LAGO LOIZA NO.7 NR DAM NR TRUJILLO ALTO, PR (LAT 18°19'29"N LONG 066°00 1 47"W) 06... 0.11 25.0 1.80 9.8 280 06... -- -- MAR 1988 03... 0.29 0.5 1.0 4.4 0.19 41.0 0.60 4.4 260 03... -- -- -- -- JUL 11... <0.2 0.20 24.0 2.30 6.2 290 11... -- -- -- -- 384 PESTICIDE ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATIONS WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 CHLOR- DI- DI- ENDO- PCB, ALDRIN, DANE, DDD, DDE, DDT, AZINON, ELDRIN SULFAN, DATE TIME TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) RIO GUAJATACA BASIN 50010790 LAGO GUAJATACA NO.1 NR DAM NR QUEBRADILLAS,PR (LAT 18- 23'56"N LONG 066°55'23"W) JUL 1988 21... 0950 <0.10 <0.01 <0.10 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 RIO GRANDE OE ARECIBO BASIN 50020050 LAGO GARZAS NO.1 NR DAM NR ADJUNTAS,PR (LAT 18- 08. 21"N LONG 06644'35"W) JUL 1988 6... 1150 <0.10 <0.01 <0.10 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 50027090 LAGO DOS BOCAS NO.1 NR DAM NR UTUADO,PR (LAT 18'20 1 09"N LONG 066 - 40'04"W) JUL 1988 7... 1000 <0.10 <0.01 <0.10 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 RIO DE LA PLATA BASIN 50039950 LAGO CARITE NO.1 NR DAM NR CAYEY, P.R. (LAT 18°04'39"N LONG 066'06'19"W) JUL 1988 13... 0935 <0.10 <0.01 <0.10 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 50044950 LAGO LA PLATA NO.3 NR DAM NR NARANJITO, PR (LAT 18°20'18"N LONG 066°14 1 01"W) JUL 1988 12... 1000 <0.10 <0.01 <0.10 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 RIO GRANDE DE LOIZA BASIN 50058800 LAGO LOIZA NO.7 NR DAM NR TRUJILLO ALTO, PR (LAT 18'19'29"N LONG 066'00 1 47"W) JUL 1988 11... 1110 <0.10 <0.01 <0.10 <0.01 <0.01 <0.01 0.02 <0.01 <0.01 385 PESTICIDE ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATIONS WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 HEPTA- METH- METHYL METHYL HEPTA- CHLOR MALA- OXY- PARA- TR1- ENDRIN, ETHION, CHLOR, EPDXIDE LINDANE THION, CHLOR, THION, THION, MIREX, DATE TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) RIO GUAJATACA BASIN-CONTINUED 50010790 LAGO GUAJATACA NO.1 NR DAM NR QUEBRADILLAS,PR (LAT 18- 23'56"N LONG 066'55'23"W) JUL 1988 21... <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 RIO GRANDE DE ARECIBO BASIN--CONTINUED 50020050 LAGO GARZAS NO.1 NR DAM NR ADJUNTAS,PR (LAT 1808'21"N LONG 066- 44'35"W) JUL 1988 6... <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 50027090 LAGO DOS BOCAS NO.1 NR DAM NR UTUADO,PR (LAT 18'20 1 09"N LONG 06640'04"W) JUL 1988 7... <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 RIO DE LA PLATA BASIN-CONTINUED 50039950 LAGO CARITE NO.1 NR DAM NR CAYEY, P.R. (LAT 18'04'39"N LONG 066'06'19"W) JUL 1988 13... <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 50044950 LAGO LA PLATA NO.3 NR DAM NR NARANJITO, PR (LAT 18'20'18"N LONG 066'14'01"W) JUL 1988 12... <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 RIO GRANDE DE LOIZA BASIN--CONTINUED 50058800 LAGO LOIZA NO.7 NR DAM NR TRUJILLO ALTO, PR (LAT 18'19'29"N LONG 06600'47"W) JUL 1988 11... <0.01 <0.01 <0.01 <0.01 <0.01 0.01 <0.01 <0.01 <0.01 <0.01 386 PESTICIDE ANALYSES OF SAMPLES COLLECTED AT WATER-QUALITY PARTIAL-RECORD STATIONS WATER-QUALITY DATA, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 NAPH­ THA­ LENES, PARA- POLY- PER- TOx- TOTAL THION, CHLOR. THANE APHENE, TRI- 2,44, 2,4,5-T 2, 4-DP SILvEx, DATE TOTAL TOTAL TOTAL TOTAL THION TOTAL TOTAL TOTAL TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) ;UG/L) (UG/L) (UG/L) (UG/L) RIO GUAJATACA BASIN--CONTINUED 50010790 LAGO GUAJATACA NO.1 NR DAM NR QUEBRADILLAS,PR (LAT 18'23'56"N LONG 066 - 55'23"W) JUL 1988 21... <0.01 <0.1 <0.10 <1 <0.01 <0.05 <0.01 <0.05 <0.01 RIO GRANDE DE ARECIBO BA'AN--CONTINUED 50020050 LAGO GARZAS NO.1 NR DAM NR ADJUNTAS,PR (LAT 18'08 1 21"N LONG 066 - 44'35"W) JUL 1988 6... <0.01 <0.1 <0.10 <1 <0.01 0.02 <0.01 <0.01 <0.01 50027090 LAGO DOS BOCAS NO.1 NR DAM NR UTUADO,PR (LAT 18'20 1 09"N LONG 06640'04"W) JUL 1988 7... <0.01 <0.1 <0.10 <1 <0.01 0.02 <0.01 <0.01 <0.01 RIO DE LA PLATA BASIN--CONTINUED 50039950 LAGO CARITE NO.1 NR DAM NR CAYEY, P.R. (LAT 18- 04'39"N LONG 066°06 1 19"W) JUL 1988 13... <0.01 <0.1 <0.10 <1 <0.01 <0.05 <0.01 <0.05 <0.01 50044950 LAGO LA PLATA NO.3 NR DAM NR NARANJITO, ti (LAT 18°20'18"N LONG 066°14 1 01"W) JUL 1988 12... <0.01 <0.1 <0.10 <1 <0.01 0.01 <0.01 <0.01 <0.01 RIO GRANDE DE LOIZA BASIN--CONTINUED 50058800 LAGO LOIZA NO.7 NR DAM NR TRUJILLO ALTO, PR (LAT 18'19'29"N LONG 066 -00'47"W) JUL 1988 11... <0.01 <0.1 <0.10 <1 <0.01 <0.01 <0.01 <0.01 387 38$ THIS PAGE WAS LEFT BLANK INTENTIONALLY 389 390 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 M 1 (Mateo Perez). AQUIFER.--Cibao Formation. Aguada Limestone. WELL CHARACTERISTICS.--Drilled production water-table well, diameter 16 in (0.40 m), cased 16 in (0.40 m) 0-40 ft (0-12.2 m), cased 12 in (0.30 m) 40-200 ft (12.2-61.0 m). Depth 200 ft (61.0 m). DATUM.--Elevation of land-surface datum is 689 ft (210 m) above mean sea level. Measuring point: Hole on pump base, 0.80 ft ((0.24 m) above land-surface datum. Prior November 1985, hole on top of pump base, 1.00 ft (0.30 m) above land-surface datum. REMARKS.--Recording observation well. Formerly published as 182421067015000. PERIOD OF RECORD.--January 1982 to March 1985. November 1985 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 44.06 ft (13.43 m) below land-surface datum, Sept. 30, 1988; lowest water level measured, 70.60 ft (21.52 m) below land-surface datum, June 18, 1982. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 47.67 47.22 46.95 46.74 46.49 46.17 46.11 45.31 44.97 44.58 2 47.70 47.17 46.99 46.65 46.47 46.25 46.09 45.28 44.97 44.63 3 47.71 47.12 46.97 46.72 46.40 46.32 46.11 45.28 44.97 44.59 4 47.62 47.13 46.90 46.81 46.37 46.32 46.09 45.28 44.99 44.57 5 47.56 47.17 46.91 46.75 46.37 46.28 45.98 45.27 44.96 44.54 6 47.59 47.22 46.90 46.76 46.39 46.31 45.92 - 45.25 44.94 44.52 7 47.57 47.20 46.88 46.69 46.41 46.30 45.88 --- 45.26 44.93 44.46 8 47.56 47.21 46.83 46.65 46.36 46.33 46.04 - 45.80 45.28 44.91 44.47 9 47.58 47.18 46.78 46.67 46.27 46.40 45.98 45.82 45.26 44.92 44.39 10 47.59 47.16 46.76 46.69 46.31 46.27 45.94 45.82 45.21 44.89 44.22 11 47.52 47.11 46.74 46.64 46.31 46.29 45.98 45.70 45.26 44.86 44.27 12 47.43 47.07 46.70 46.65 46.30 46.30 45.99 45.64 45.28 44.89 44.39 13 47.42 47.09 46.79 46.67 46.25 46.24 46.03 45.65 45.17 44.92 44.37 14 47.42 47.10 46.83 46.64 46.27 46.12 46.02 45.68 45.11 44.91 44.37 15 47.42 47.09 46.86 46.61 46.28 46.29 45.98 45.64 45.15 44.87 44.41 16 47.39 47.08 46.81 46.60 46.29 46.43 46.02 45.60 45.16 44.85 44.40 17 47.36 47.09 46.78 46.75 46.28 46.48 45.96 45.57 45.11 44.83 44.34 18 47.36 47.12 46.79 46.60 46.22 46.46 45.97 45.58 45.08 44.78 44.22 19 47.37 47.10 46.86 46.61 46.22 46.39 45.91 45.58 45.07 44.78 44.21 20 47.38 47.05 46.86 46.60 46.22 46.43 45.88 45.56 45.10 44.77 44.32 21 47.39 46.99 46.79 46.56 46.24 46.45 45.92 45.53 45.06 44.75 44.30 22 47.39 46.99 46.83 46.57 46.28 46.41 45.97 45.49 45.01 44.72 44.23 23 47.38 46.94 46.82 46.52 46.23 46.36 46.07 45.48 45.05 44.74 44.20 24 47.39 46.95 46.79 46.64 46.19 46.31 --- 45.47 45.03 44.60 44.21 25 47.28 46.85 46.78 46.55 46.10 46.26 45.42 45.01 44.66 44.19 26 47.23 46.80 46.73 46.58 46.06 46.25 45.39 44.99 44.60 44.18 27 47.26 46.79 46.70 46.53 46.10 46.13 45.39 45.02 44.61 44.17 28 47.25 46.81 46.69 46.49 46.12 46.16 45.39 44.99 44.62 44.17 29 47.28 46.81 46.60 46.50 46.17 46.12 45.32 44.94 44.60 44.16 30 47.23 46.86 46.65 46.50 --- 46.10 45.31 44.99 44.53 44.12 31 47.22 --- 46.77 46.50 46.10 --- 44.95 44.54 --- • LOW 47.71 47.22 46.99 46.81 46.49 46.48 45.31 44.99 44.63 HIGH 47.22 46.79 46.60 46.49 46.06 46.10 44.94 44.53 44.12 W n 40 0:11- 45 Lao 14 6-0 50 w 55 v) wl -1 60 ce 65 NDJF AMJ J ASONDJFM AMJ J ASONDJFMAMJJ AS 1988 19851986 M 1987 I I 301 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 Barret() 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-.), diameter 13 in (0.33 m), cased 13 in (0.33 a) 0-550 ft (0-167.6 ), perforated 270-529 ft (82.3-161.2 m). Depth 550 ft (167.6 ). DATUM.--Elevation of land-surface datum is about 475 ft (145 m) above mean sea level, from topographic map. Measuring point: Hole on side of casing, 1.50 ft (0.46 m) above land-surface datum. Prior July 25, 1986, top of shelter floor, 3.30 ft (1.00 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--November 1985 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 409.17 ft (124.71 m) below land-surface datum, Sept. 25, 1986; lowest water level recorded. 452.80 ft (138.01 m) below land-surface datum, June 26. 1986. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM. WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 423.06 424.06 424.33 423.27 423.62 425.15 427.48 427.93 425.60 425.32 425.35 427.34 2 423.11 424.09 424.38 423.21 423.66 425.27 427.53 427.88 425.54 425.23 425.39 427.38 3 423.14 424.11 424.39 423.19 423.69 425.34 427.63 427.87 425.48 425.19 425.43 427.41 4 423.15 424.16 424.40 423.14 423.76 425.43 427.69 427.85 425.47 425.16 425.53 427.44 5 423.18 424.21 424.45 423.09 423.82 425.50 427.74 427.82 425.43 425.09 425.58 427.46 6 423.23 424.25 424.47 423.06 423.87 425.54 427.82 427.77 425.38 425.03 425.65 427.52 7 423.26 424.28 424.49 422.99 423.91 425.63 427.88 427.77 425.35 424.98 425.71 427.54 8 423.29 424.32 424.53 422,92 423.93 425.70 427.95 427.79 425.32 424.96 425.78 427.59 9 423.33 424.31 424.51 422.89 423.94 425.74 428.03 427.84 425.34 424.86 425.85 427.62 10 423.37 424.31 424.52 422.88 424.00 425.82 4 9.08 427.85 425.32 424.81 425.93 427.55 11 423.37 424.31 424.53 422,86 424.05 425.92 428.17 427.87 425.26 424.81 426.00 427.61 12 423.36 424.35 424.57 422.84 424.07 425.93 428.26 427.82 425.25 424.80 426.07 427.59 13 423.39 424.38 424.63 422.82 424.11 425.93 428.32 427.68 425.32 424.76 426.14 427.55 14 423.43 424.42 424.63 422.82 424.17 425.93 428.42 427.56 425.37 424.72 426.22 427.53 15 423.45 424.42 424.62 422.81 424.23 425.93 428.49 427.43 425.37 424.74 426.29 427.50 16 423.47 424.44 424.53 422.82 424.28 426.27 428.59 427.31 425.39 424.76 426.36 427.42 17 423.50 424.49 424.47 422.87 424.34 426.35 428.67 427.01 425.42 424.73 426.44 427.35 18 423.54 424.52 424.39 422.86 424.36 426.43 428.73 426.66 425.47 424.64 426.50 427.25 19 423.58 424.50 424.33 422.90 424.46 426.48 428.78 426.45 425.50 424.63 426.58 427.20 20 423.62 424.47 424.24 422.94 424.49 426.59 428.85 426.29 425.51 424.79 426.64 427.18 21 423.65 424.42 424.13 422.96 424.57 426.67 428.90 426.19 425.52 424.80 426.72 427.13 22 423.68 424.40 424.06 422.97 424.66 426.75 428.94 426.12 425.51 424.81 426.80 427.05 23 423.73 424.33 423.95 422.97 424.69 426.83 428.87 426.06 425.51 424.86 426.89 427.01 24 423.75 424.30 423.85 423.10 424.76 426.87 428.58 426.01 425.55 424.92 426.92 427.00 25 423.76 424.26 423.73 423.13 424.80 426.94 428.34 425.91 425.53 424.96 427.04 426.96 26 423.79 424.24 423.63 423.21 424.85 427.02 428.22 425.86 425.54 425.00 427.09 426.93 27 423.85 424.22 423.55 423.27 424.91 427.09 428.16 425.81 425.55 425.05 427.15 426.92 28 423.88 424.22 423.48 423.32 425.01 427.16 428.09 425.77 425.55 425.13 427.20 426.90 29 423.97 424.24 423.35 423.42 425.11 427.25 428.06 425.72 425.45 425.15 427.22 426.88 30 423.97 424.27 423.34 423.47 427.33 428.00 425.69 425.38 425.23 427.24 426.87 31 424.02 423.32 423.54 427.40 425.65 425.27 427.29 LOW 424.02 424.52 424.63 423.54 425.11 427.40 428.94 427.93 425.60 425.32 427.29 427.62 HIGH 423.06 424.06 423.32 422.81 423.62 425.15 427.48 425.65 425.25 424.40 425.35 426.87 WTR YR 1988 MEAN 425.40 LOW 428.94 HIGH 422.81 400 420 "' ., ,..,.....................J1 "1"..-""'"..."''''''''''" 440 ,....---.. 460 NDJ FMAMJJ ASONDJFMAMJ4 ASONDJ_FMAMJJ AS 19851986 1987 392 GROUND-WATER LEVELS RIO GRANDE DE ARECIBO BASIN 182737066370900. Local number, 204. LOCATION.--Lat 18'27'37", long 66'37'09". Owner: Sucesion Marquez. Name: Gilberto Rivera well. AQUIFER.--Aymamon Limestone. WELL CHARACTERISTICS.--Abandoned unused water-table well, diameter 6 in (0.15 m), cased 6 in (0.15 m). DATUM.--Elevation of land-surface datum is 48.0 ft (14.63 m) above mean sea level. Measuring point: Air hole on pump base, 0.50 ft (0.15 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--October 1985 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 50.00 ft (15.24 m) below land-surface datum, May 14, 1986; lowest water level recorded., 52.28 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 1987 TO SEPTEMBER 1988 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 51.79 51.90 51.83 52.07 52.18 52.02 52.11 52.14 51.91 51.95 51.98 51.54 2 51.76 51.86 51.97 52.08 52.13 52.11 52.21 52.11 51.91 51.91 52.01 51.56 3 51.74 51.82 51.94 51.96 52.07 52.12 52.23 52.01 52.00 51.88 52.04 51.61 4 51.62 51.83 52.04 51.95 52.05 52.28 52.22 52.12 52.00 51.88 52.02 51.66 5 51.65 51.83 52.03 51.96 52.04 52.31 52.21 52.17 52.07 51.88 52.00 51.67 6 51.61 51.86 51.94 52.06 52.06 52.32 52.20 52.15 52.10 51.94 52.00 51.66 7 51.51 51.92 52.09 52.06 52.06 52.28 52.18 52.13 52.10 51.96 52.01 51.61 8 51.51 51.91 52.14 52.08 52.08 52.28 52.15 52.11 52.00 52.02 51.98 51.57 9 51.62 52.03 52.15 51.96 52.08 52.31 52.15 52.11 52.09 52.07 51.93 51.51 10 51.70 52.06 52.00 52.04 52.05 52.16 52.10 52.10 52.08 51.89 51.44 11 51.74 52.05 52.07 52.02 52.06 52.13 51.94 52.13 52.07 51.84 51.44 12 51.77 52.06 52.07 51.98 52.09 52.11 51.72 52.11 52.07 51.82 51.35 13 51.77 52.07 52.08 52.07 52.12 52.08 51.66 52.08 52.08 51.79 51.33 14 51.76 52.04 52.01 52.09 52.12 52.00 51.70 51.98 52.06 51.80 51.42 15 51.80 52.02 52.08 52.14 52.14 52.10 51.74 52.07 52.05 51.81 51.50 16 51.77 52.01 52.06 52.11 52.14 52.07 51.75 52.05 52.06 51.84 51.53 17 51.73 51.98 52.04 52.09 52.12 52.10 51.77 52.05 52.05 51.82 51.62 18 51.72 51.98 52.00 52.11 52.03 52.11 51.82 52.08 52.05 51.76 51.68 19 51.70 51.96 52.04 52.08 52.09 52.15 51.88 52.08 52.06 51.75 51.72 20 51.68 51.87 52.08 52.09 52.02 52.14 51.91 52.10 52.09 51.78 51.71 21 51.66 51.80 52.09 52.10 52.12 52.01 51.96 52.10 52.12 51.80 51.74 22 51.66 51.83 52.09 52.07 52.02 52.07 51.90 51.97 52.15 51.86 51.73 23 51.70 51.90 52.06 52.09 52.12 --- 52.01 51.90 51.97 52.19 51.81 51.67 24 51.73 51.95 52.05 52.07 52.11 52.33 52.11 52.03 52.00 52.19 51.75 51.65 25 51.76 51.96 52.06 52.07 52.11 52.33 52.16 52.05 51.98 52.19 51.68 51.65 26 51.83 51.94 52.06 52.03 52.05 52.30 52.12 52.04 52.00 52.18 51.55 51.66 27 51.87 51.83 52.06 52.04 52.03 52.26 52.00 52.01 51.99 52.18 51.48 51.68 28 51.81 51.83 52.06 52.13 52.07 52.23 52.05 52.10 51.99 52.13 51.43 51.75 29 51.90 51.84 51.94 52.14 52.01 52.18 52.05 52.07 51.99 52.09 51.43 51.81 30 51.94 51.85 51.98 52.15 52.15 52.10 52.06 51.98 52.03 51.48 51.87 31 51.93 52.01 52.20 52.11 52.04 51.88 51.51 LOW 51.94 52.07 52.15 52.20 52.18 52.23 52.17 52.13 52.19 52.04 51.87 HIGH 51.51 51.80 51.83 51.95 52.01 52.00 51.66 51.91 51.88 51.43 51.33 of 50 LAI 03 I- !fa 51 1.w w0 V\e'v 52 >0) w I 53 -J CI Z LAJ < I- --I < 54 ONDJFMAMJJ ASONDJFMAMJJ ASONDJFMAMJJ AS 1988 1985 1986 1987 393 GROUND-WATER LEVELS RIO GRANDE DE MANATI BASIN 182544066341500. Local numnber, 205. LOCATION.--Lat 18- 25'44", long 66 34'15". Owner: U.S. Geological Survey. Name: NC-05 Barceloneta near Cruce Davila. AQUI'ER.--Montebello Limestone. WELL CHARACTERISTICS.--Artesian observation well, diameter 6 in (0.15 n), 0-2.564 ft (0-782 m) , cased 2.5 in (0.06 m), iron pipe 0-1,075 ft (0-328 m), open hole 1,075-2,564 ft (328-782 m). Depth 2,564 ft (782 m) measured. DATUM.--Elevation of land surface datum is 312 ft (95.1 m) above mean sea level, from topographic map. Measuring point: Top of shelter floor, 6.65 ft (2.03 m) above land-surface datum. REMARKS.--Recording observation ell. PERIOD OF RECORDS.--December 1986 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 9.16 ft (2.79 m) below land-surface datum. Aug. 18, 1987; lowest water level recorded, 13.65 ft (4.16 m) below land-surface datum, Dec. 9, 1986. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 9.59 9.27 9.22 8.87 9.21 8.80 8.99 9.21 8.60 9.23 9.63 10.39 2 9.60 9.42 9.22 8.81 9.29 9.00 8.97 9.18 8.44 9.20 9.78 10.46 3 9.60 9.29 9.20 8.77 9.24 9.00 8.93 9.17 8.49 9.20 9.77 10.43 4 9.61 9.31 9.20 8.73 9.24 8.99 8.97 9.18 8.36 9.22 9.83 10.26 5 9.54 9.34 9.19 8.72 9.22 8.82 9.06 9.15 8.40 9.23 9.75 10.39 6 9.96 9.44 9.19 8.69 9.70 8.73 9.05 8.95 8.55 9.27 9.76 10.47 7 9.78 9.33 9.19 8.73 9.56 8.75 9.02 8.78 8.64 9.30 9.81 10.49 8 9.73 9.31 9.34 8.73 9.55 8.90 9.06 8.46 8.72 9.31 9.86 10.45 9 9.60 9.26 --- 8.73 9.51 8.88 9.07 8.27 8.81 9.30 9.84 10.53 10 9.47 9.27 8.72 9.52 8.88 9.13 8.10 8.86 9.30 9.88 10.46 11 9.58 9.25 --- 8.72 9.52 8.89 9.08 7.92 8.82 9.47 9.91 10.47 12 9.79 9.22 9.33 8.72 9.45 8.87 9.14 7.59 8.79 9.45 9.95 10.53 13 9.70 9.26 9.22 8.72 9.40 8.84 9.17 7.41 8.93 9.39 9.95 10.53 14 9.64 --- 9.30 8.70 9.11 8.84 9.18 7.37 8.96 9.47 9.93 10.53 15 9.69 9.26 8.51 9.11 8.82 9.21 7.54 8.98 9.54 9.97 10.54 16 9.58 9.22 8.54 9.08 9.07 9.26 7.52 8.92 9.38 9.99 10.68 17 9.41 9.23 8.50 9.02 8.99 8.96 7.61 8.96 9.35 9.99 10.68 18 9.45 9.28 8.51 9.00 9.14 9.18 7.64 8.91 9.36 10.00 10.62 19 9.55 9.16 8.57 8.99 8.99 9.05 7.93 8.88 9.44 10.01 10.64 20 9.56 9.16 8.51 8.94 8.99 9.05 7.92 9.01 9.49 10.04 10.77 21 9.54 9.26 8.46 8.93 9.00 9.02 7.80 9.12 9.60 10.00 10.65 22 9.55 9.29 9.43 8.96 8.98 8.93 7.87 9.08 9.60 10.07 10.64 23 9.52 --- 9.23 9.41 9.00 --- 8.94 8.09 9.18 9.61 10.20 10.69 24 9.44 9.21 9.20 9.41 9.01 --- 8.94 7.97 9.13 9.58 10.26 10.52 25 9.25 9.25 9.05 9.41 8.95 8.85 8.94 8.05 9.12 9.57 10.26 10.44 26 9.32 9.30 8.99 9.42 8.90 8.94 9.16 8.12 9.12 9.64 10.26 10.50 27 9.34 9.30 9.07 9.38 8.85 8.94 9.17 8.17 9.19 9.73 10.28 10.57 28 9.34 9.30 9.09 9.36 8.83 8.87 9.19 8.25 9.22 9.72 10.31 10.55 29 9.42 9.30 8.99 9.34 8.85 8.92 9.19 8.28 9.22 9.72 10.26 10.51 30 9.21 9.22 9.09 9.30 --- 8.97 9.28 8.33 9.23 9.69 10.37 10.50 31 9.23 --- 9.10 9.29 8.95 --- 8.57 --- 9.63 10.44 --- LOW 9.96 9.43 9.70 9.28 9.21 9.23 9.73 10.44 10.77 HIGH 9.21 8.46 8.83 8.93 7.37 8.36 9.20 9.63 10.26 c) 6 Le La 0 8 t4W z < 10 i 12 ae DJ FMAMJJ ASONDJ FMAMJJ AS 1986 1987 1988 14 394 GROUND-WATER LEVELS RIO GRANDE DE MANATI BASIN 182757066325600. Local number, 206. LOCATION.--Lat 18'27'57", long 66°32'56". Owner: P.R. Department of Agriculture. Name: Plazuela No. 2. AQUIFER.--Aymamon Limestone. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 16 in (0.41 m), cased 16 in (0.41 m) 0-85 ft (0-25.9 m), open hole 85-101 ft (25.9-30.8 m). Depth 101 ft (30.8 m). DATUM.--Elevation of land-surface datum is about 7.0 ft (2.1 m) above mean sea level, from topographic map. Measuring point: Hole on side of casing, 1.30 ft (0.40 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--October 1985 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 3.75 ft (1.14 m) below land-surface datum, Sept. 11, 1988; lowest water level recorded, 5.72 ft (1.76 m) below land-surface datum, Oct. 8-9, 1986. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 5.06 5.14 5.09 5.04 5.09 5.37 5.30 5.23 5.25 5.22 5.27 4.73 2 5.03 5.11 5.10 4.84 5.02 5.39 5.32 5.24 5.25 5.22 5.29 4.82 3 4.99 5.09 5.18 4.89 4.95 5.44 5.35 5.22 5.26 5.20 5.30 4.89 4 4.94 5.09 5.21 4.94 4.91 5.50 5.34 5.23 5.26 5.19 5.01 4.97 5 4.90 5.10 5.22 4.99 4.99 5.54 5.33 5.28 5.31 5.21 5.15 5,02 6 4.88 5.12 5.20 5.05 5.08 5.55 5.32 5.27 5.32 5.24 5.22 5.04 7 4.86 5.17 5.25 5.08 5.14 --- 5.31 5.25 5.32 5.27 5.30 5.07 8 4.88 5.24 5.28 5.12 5.20 5.27 5.23 5.30 5.32 5.28 5.06 9 4.91 5.28 5.30 5.11 5.22 5.27 5.21 5.30 5.37 5.25 4.60 10 4.98 5.30 5.24 5.12 5.23 5.27 4.84 5.30 5.38 5.22 3.79 11 5.03 5.29 5.23 5.13 5.26 5.25 4.58 5.32 5.38 5.19 3.75 12 5.06 5.29 5.22 5.15 5.30 5.18 4.50 5.31 5.39 5.17 3.95 13 5.05 5.30 5.24 5.16 5.34 5.20 4.66 5.29 5.40 5.15 4.10 14 5.05 5.28 5.25 5.18 5.36 5.21 4.76 5.30 5.39 5.15 4.31 15 5.06 5.26 5.20 5.22 5.37 5.22 4.84 5.31 5.39 5.15 4.53 16 5.05 5.25 5.17 5.21 5.38 4.98 4.89 5.30 5.39 5.18 4.71 17 4.99 5.20 5.14 5.19 5.35 5.11 4.94 5.29 5.38 5.18 4.84 18 4.98 5.18 5.12 5.21 5.34 5.19 4.99 5.31 5.38 4.62 4.88 19 4.97 5.17 5.15 5.20 5.33 5.24 5.05 5.32 5.39 4.73 4.98 20 4.95 5.11 5.20 5.21 5.33 5.25 5.09 5.34 5.41 4.85 5.02 21 4.95 5.07 4.92 5.22 5.35 5.20 5.14 5.34 5.42 4.98 5.04 22 4.95 5.08 4.99 5.26 5.35 --- 5.20 5.17 5.30 5.44 5.07 5.05 23 5.03 5.12 5.03 5.26 5.36 5.70 5.21 5.18 5.28 5.47 4.56 5.03 24 5.07 5.15 5.06 5.25 5.36 5.47 5.23 5.20 4.95 5.47 4.19 5.03 25 --- 5.15 5.08 5.19 5.37 5.47 5.26 5.22 5.06 5.47 4.04 5.05 26 5.13 5.02 5.23 5.33 5.44 5.23 5.22 5.11 5.46 4.19 5.06 27 --- 5.11 4.95 5.27 5.31 5.40 5.19 5.24 5.16 5.45 3.86 5.08 28 5.13 5.03 4.99 5.31 5.34 5.35 5.16 5.25 5.11 5.41 4.10 5.13 29 5.13 5.03 4.99 5.32 5.36 5.29 5.16 5.24 5.15 5.37 4.29 5.18 30 5.16 5.05 5.01 5.32 --- 5.26 5.19 5.24 5.21 5.31 4.45 5.21 31 5.16 --- 5.02 5.36 5.30 --- 5.22 --- 5.27 4.60 --- LOW 5.30 5.30 5.36 5.38 5.35 5.28 5.34 5.47 5.30 5.21 HIGH 5.03 4.92 4.84 4.91 4.98 4.50 4.95 5.19 3.86 3.75 9 3 CO I-. LAJ < o La 4 ze. >v) 5 J 0 .q< -1 6 ONDJFMAMJJ ASONDJ FMAMJJ ASONDJ FMAMJJ AS 1985 1986 1987 1988 395 GROUND-WATER LEVELS RIO GRANDE DE MANAT1 BASIN 182710066303700. Local number, 207. LOCATION.--Lat 1827'10", long 66'30'37". Owner: P.R. Aqueduct and Sewer Authority. Name: Cantito La Luisa. AQUIFER.--Aymamon Limestone. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 20 in (0.51 m), cased 20 in (0.51 m) 0-30 ft (0-9.14 m), cased 10 in (0.25 m) 0-126 ft (0-38.4 m), perforated 80-126 ft (24.4-38.4 m). Depth 126 ft (38.4 m). DATUM.--Elevation of land-surface datum is about 59.0 ft (18.0 m) above mean sea level, from topographic map. Measuring point: Hole on side of casing, 2.00 ft (0.61 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--October 1985 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 36.38 ft (11.09 m) below land-surface datum, May 15, 1986; lowest water level recorded, 89.83 ft (27.38 m) below land-surface datum, Oct. 5, 1985. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 38.52 38.84 38.61 38.45 38.80 38.90 39.15 38.89 38.67 38.90 39.12 38.62 2 38.51 38.84 38.19 38.44 38.78 38.90 39.15 38.90 38.70 38.90 39.12 38.65 3 38.51 38.84 38.33 38.42 38.73 38.91 39.15 38.91 38.74 38.90 39.13 38.68 4 38.49 38.85 38.45 38.41 38.70 38.93 39.15 38.92 38.75 38.89 39.10 38.71 5 38.50 38.87 38.53 38.41 38.67 38.96 39.16 38.94 38.78 38.89 39.10 38.73 6 38.50 38.88 38.56 38.43 38.67 38.98 39.16 38.94 38.81 38.90 39.09 38.74 7 38.50 38.89 38.59 38.45 38.67 38.98 39.16 38.94 38.82 38.91 39.09 38.73 8 38.52 38.91 38.62 38.47 38.68 39.00 39.15 38.94 38.83 38.93 39.09 38.73 9 38.54 38.93 38.65 38.48 38.69 39.02 39.15 38.94 38.84 38.96 39.08 38.72 10 38.57 38.93 38.66 38.46 38.68 39.04 39.16 38.91 38.85 38.98 39.07 38.62 11 38.60 38.93 38.67 38.47 38.69 39.02 39.14 38.36 38.86 38.98 39.06 38.57 12 38.62 38.93 38.68 38.51 38.72 38.98 39.14 38.10 38.87 39.00 39.04 38.53 13 38.63 38.94 38.72 38.53 38.76 38.99 39.12 38.04 38.88 39.01 39.05 38.49 14 38.63 38.94 38.76 38.55 38.79 39.00 39.10 38.06 38.88 39.02 39.06 38.50 15 38.66 38.92 38.70 38.58 38.82 39.00 39.10 38.08 38.89 39.04 39.07 38.53 16 38.64 38.91 38.63 38.60 38.83 39.01 39.00 38.11 38.90 39.06 39.09 38.55 17 38.65 38.90 38.62 38.60 38.83 39.04 38.97 38.15 38.90 39.06 39.08 38.58 18 38.66 38.90 38.62 38.60 38.83 39.04 38.94 38.20 38.91 39.07 39.03 38.61 19 38.67 38.90 38.64 38.57 38.83 39.06 38.92 38.25 38.92 39.08 38.99 38.63 20 38.68 38.89 38.63 38.57 38.83 39.06 38.91 38.32 38.93 39.09 39.00 38.63 21 38.68 38.86 38.57 38.59 38.85 39.08 38.90 38.37 38.94 39.12 39.00 38.64 22 38.69 38.85 38.54 38.60 38.87 39.12 38.86 38.43 38.93 39.13 39.00 38.64 23 38.71 38.86 38.52 38.62 38.88 39.15 38.83 38.48 38.91 39.14 38.93 38.64 24 38.74 38.84 38.52 38.64 38.89 39.17 38.81 38.51 38.91 39.13 38.92 38.64 25 38.75 38.81 38.52 38.66 38.90 39.18 38.83 38.53 38.90 39.16 38.74 38.66 26 38.78 38.80 38.52 38.70 38.90 39.18 38.83 38.56 38.90 39.16 38.66 38.70 27 38.79 38.78 38.49 38.74 38.90 39.18 38.84 38.58 38.90 39.17 38.60 38.71 28 38.80 38.64 38.47 38.77 38.90 39.17 38.84 38.60 38.90 39.15 38.57 38.72 29 38.80 38.60 38.47 38.79 38.90 39.15 38.85 38.63 38.90 39.15 38.56 38.73 30 38.81 38.59 38.46 38.80 39.13 38.87 38.66 38.90 39.14 38.58 38.72 31 38.83 38.48 38.80 39.14 38.66 .39.12 38.59 LOW 38.83 38.94 38.76 38.80 38.90 39.18 39.16 38.94 38.94 39.17 39.13 38.74 HIGH 38.49 38.59 38.19 38.41 38.67 38.90 38.81 38.04 38.67 38.89 38.56 38.49 WTR YR 1988 MEAN 38.79 LOW 39.18 HIGH 38.04 36 gx cl 37 w w lr LI 38 vt' 14 CII 39 -J CEZ <g 40 ONDJ FMAMJ J ASONDJ FM AMJ J AS O N D J FMAMJJ AS 1988 1985 1986 1987 398 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 14 in (0.36 m). Depth 235 ft ( 7 1 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.--Recording observation well. PERIOD OF RECORD.--January 1986 to May 13, 1988, discontinued. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 225.95 ft (68.81 m) below land-surface datum. May 31, 1987; lowest water level recorded, 238.33 ft (72.64 m) below land-surface datum. Mar. 30-31, Apr. 1-10, 1987. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 236.13 236.35 236.31 235.57 236.20 236.20 236.52 237.56 2 236.14 236.35 236.31 235.29 236.08 236.20 236.55 237.59 3 236.15 236.35 236.31 235.14 235.90 236.20 236.59 237.63 4 236.16 236.35 236.31 235.10 235.69 236.20 236.62 237.66 5 236.16 236.35 236.31 235.10 235.59 236.20 236.66 237.69 6 236.17 236.35 236.31 235.12 235.59 236.20 236.69 237.74 7 236.18 236.35 236.31 235.13 235.65 236.20 236.73 237.76 8 236.19 236.36 236.31 235.08 235.68 236.20 236.76 237.81 9 236.20 236.36 236.32 235.12 235.70 236.20 236.80 237.83 10 236.21 236.36 236.32 235.18 235.80 236.20 ,36.83 237.88 11 236.21 236.36 236.32 235.22 235.87 236.20 236.87 235.69 12 236.22 236.36 236.32 235.25 235.90 236.20 236.90 234.13 13 236.23 236.36 236.32 235.30 235.92 236.20 236.94 14 236.24 236.36 236.32 235.37 236.00 236.20 236.97 15 236.25 236.36 236.32 235.48 236.09 236.20 237.01 16 236.25 236.36 236.32 235.54 236.11 236.20 237.04 17 236.26 236.36 236.32 235.61 236.19 236.20 237.08 18 236.27 236.36 236.32 235.65 236.19 236.20 237.11 19 236.28 236.36 236.32 235.67 236.19 236.20 237.15 20 236.29 236.36 236.32 235.71 236.19 236.20 237.17 21 236.29 236.36 236.31 235.86 236.20 236.20 237.02 22 236.30 236.36 236.10 235.91 236.20 236.20 237.03 23 236.31 236.36 235.98 236.00 236.20 236.20 237.06 24 236.32 236.36 235.89 236.09 236.20 236.24 237.08 25 236.33 236.36 235.88 236.11 236.20 236.27 237.13 26 236.34 236.36 235.83 236.19 236.20 236.31 237.16 27 236.34 236.36 235.81 236.19 236.20 236.34 237.22 28 236.35 236.36 235.72 236.19 236.20 236.38 237.32 29 236.35 236.32 235.72 236.20 236.20 236.41 237.38 30 236.35 236.30 235.82 236.20 236.45 237.52 31 236.35 235.74 236.20 236.48 LOW 236.35 236.36 236.32 236.20 236.20 236.48 237.52 HIGH 236.13 236.30 235.72 235.08 235.59 236.20 236.52 0 220 -1 1.41= CD 1- La 225 i-- CI U 1.1L 230 IAJ-> La I _Je 235 - I CI IX Z 240 J FM AMJ J ASONDJ F MAM J J A S ON DJ FMAM J J AS 1986 1987 1988 397 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.--Aymamon-Aguada Limestone. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 16 in (0.41 m), caed 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 m) above mean sea level, from topographic map. Measuring point: Hole on side of casing, 2.30 ft (0.70 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--October 1985 to October 30, 1987, discontinued. 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 m) below land-surface datum, June 24, 1986. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 80.92 2 80.94 3 80.94 4 80.94 5 80.94 6 80.94 7 80.94 8 80.94 9 80.94 10 80.94 11 80.94 12 80.94 13 80.96 14 80.96 15 80.97 16 80.97 17 80.97 18 80.97 19 80.97 20 80.97 21 80.97 22 80.85 23 80.80 24 80.75 25 80.74 26 80.72 27 80.72 28 80.11 29 80.70 30 31 LOW HIGH of 65 La m ticl 70 Lu 75 La CI1 80 < I- 85 ONDJFMAMJJASONDJEMAIAJJASONDJFIAAMJJAS 1985 1986 1987 1988 398 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.--tares Limestone. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 8 in (0.20 m), cased 8 in (0.20 m). DATUM.--Elevation of land-surface datum is about 574 ft (174.9 m) above mean sea level, from topographic map. •Measuring point: Hole on side of casing, 2.00 ft (0.61 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--October 1985 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 40.56 ft (12.36 m) below land-surface datum, May 22, 1986; lowest water level recorded, 67.67 ft (20.62 m) below land-surface datum, Apr. 6, 1986. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1987 INSTANTANEOUS OBSERVATION AT 1200 TO SEPTEMBER 1988 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 57.52 62.34 57.07 49.65 49.76 53.35 58.91 49.26 49.52 50.03 65.04 50.07 2 57.74 62.39 57.33 49.00 49.33 53.66 58.90 49.33 49.50 50.07 65.14 50.88 3 58.13 62.44 58.51 48.59 49.04 53.90 58.96 49.39 49.47 50.10 65.24 52.70 4 58.42 62.50 59.39 48.79 49.05 54.10 59.11 49.45 49.46 50.15 65.30 54.64 5 58.56 62.54 60.08 49.02 49.05 54.26 59.33 49.47 49.45 50.25 65.33 56.65 6 58.73 62.61 60.75 49.29 49.15 54.35 59.58 49.50 49.45 50.49 65.41 58.54 7 58.98 62.67 61.39 49.49 49.39 54.50 59.97 49.52 49.46 51.55 65.48 59.67 8 59.34 62.72 61.86 49.64 49.62 54.67 60.40 49.55 49.52 --- 65.44 60.49 9 59.82 62.77 62.12 49.71 49.77 54.82 60.96 49.56 49.58 65.49 61.35 10 60.14 62.83 62.28 49.82 49.91 54.99 61.57 49.57 49.66 65.55 61.74 11 60.39 62.98 62.36 49.97 50.06 55.22 62.08 49.51 49.69 - 65.58 60.10 12 60.64 63.29 62.44 50.12 50.16 55.49 62.32 48.97 49.71 65.63 55.43 13 60.86 63.59 62.54 50.27 50.28 55.74 62.43 49.03 49.69 65.68 50.18 14 61.06 63.77 62.60 50.40 50.42 56.02 62.44 49.11 49.69 65.73 49.94 15 61.18 63.96 62.66 50.48 50.54 56.34 62.43 49.19 49.69 65.78 50.06 16 61.27 64.08 62.72 50.65 50.70 56.66 62.14 49.29 49.71 65.81 50.35 17 61.49 64.22 62.81 50.88 50.86 56.96 53.00 49.34 49.71 65.87 50.55 18 61.59 64.25 62.91 51.16 51.04 57.15 48.77 49.38 49.75 65.90 50.35 19 61.55 64.23 63.11 51.38 51.20 57.31 48.11 49.44 49.79 65.88 50.24 20 61.50 64.12 63.20 51.57 51.34 57.48 48.19 49.46 49.85 65.83 50.39 21 61.46 64.10 62.13 51.69 51.53 57.67 48.03 49.47 49.86 - 65.79 50.55 22 61.46 64.14 49.92 51.82 51.74 57.82 48.03 49.49 49.90 - 65.77 50.44 23 61.38 64.21 49.21 52.00 51.88 57.95 48.06 49.52 49.91 65.76 50.72 24 61.34 64.30 49.26 52.18 52.09 58.13 48.13 49.48 49.90 65.71 51.93 25 61.31 64.35 49.51 52.36 52.28 58.32 48.18 49.47 49.90 63.98 53.34 26 61.36 64.36 49.60 52.54 52.51 58.58 48.32 49.47 49.93 52.72 54.97 27 61.50 64.30 49.44 52.72 52.81 58.75 48.60 49.49 49.96 --- 49.15 56.23 28 61.71 63.54 49.33 52.84 53.00 58.82 48.91 49.49 49.99 64.32 49.06 57.34 29 61.96 62.12 49.50 52.99 53.17 58.87 49.08 49.50 49.98 64.57 49.27 58.26 30 62.15 58.77 49.79 53.11 --- 58.90 49.16 49.50 49.98 64.79 49.53 58.92 31 62.24 --- 49.92 50.15 58.89 --- 49.52 --- 64.92 49.80 --- LOW 62.24 64.36 63.20 53.11 53.17 58.90 62.44 49.57 49.99 65.90 61.74 HIGH 57.52 58.77 49.21 48.59 49.04 53.35 48.03 48.97 49.45 49.06 49.94 0 20 4( wo LW 40 zgs >v160 aZ W 4c FMAMJJ ASONDJFMAMJJ ASONDJFMAMJJ AS 1986 1987 1988 399 GROUND-WATER LEVELS RIO CIBUCO BASIN 182647066201700. Local number, 70. LOCATION.--Lat 18 26'47", long 66'20'17". Owner: P.R. Aqueduct and Sewer Authority. Name: Sabana Hoyos. AQUIFER.--Limestone of Tertiary Age. WELL CHARACTERISTICS.--Drilled unused artesian well, diameter 8 in (0.20 m), cased 0-90 ft (0-27.43 m), perforated. Depth 90 ft (27.43 m). DATUM.--Elevation of land-surface datum is about 49 ft (14.9 m) above mean sea level, from topographic map. Measuring point: Top of casing wooden cover, 1.30 ft (0.40 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--February 1960 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 21.33 ft (6.50 m) below land-surface datum, Oct. 26, 1976; lowest water level recorded, 31.10 ft (9.48 m) below land-surface datum, July 31, 1975. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 INSTANMTANEOUS OBSERVATION 41 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 27.21 27.32 27.07 26.89 27.14 27.30 27.90 27.42 26.69 27.21 27.54 26.71 2 27.22 27.34 27.05 26.86 27.12 27.33 27.92 27.44 26.71 27.23 27.55 26.73 3 27.23 27.36 27.06 26.81 27.08 27.35 27.93 27.46 26.74 27.24 27.56 26.74 4 27.24 27.38 27.07 26.78 27.05 27.38 27.94 27.49 26.77 27.25 27.52 26.76 5 27.24 27.39 27.09 26.76 27.02 27.40 27.95 27.51 26.79 27.25 27.52 26.78 6 27.27 27.42 27.10 26.76 27.01 27.42 27.97 27.53 26.82 27.26 27.51 26.80 7 27.28 27.44 27.11 26.75 27.00 27.45 27.98 27.55 26.84 27.26 27,50 26.82 8 27.30 27.46 27.12 26.76 27.01 27.46 27.99 27.57 26.87 27.28 27.50 26.84 9 27.31 27.48 27.13 26.77 27.01 27.49 28.01 27.59 26.89 27.29 27.50 26.84 10 27.30 27.49 27.14 26.78 27.03 27.51 28.02 27.51 26.91 27.31 27.49 26.78 11 27.32 27.51 27.14 26.79 27.05 27.54 28.03 26.82 26.94 27.31 27.49 26.74 12 27.33 27.53 27.16 26.80 27.06 27.56 28.05 26.50 26.95 27.33 27.49 26.67 13 27.32 27.55 27.18 26.82 27.08 27.57 28.07 26.40 26.97 27.34 27.50 26.62 14 27.35 27.57 27.20 26.83 27.10 27.59 28.08 26.36 26.99 27.35 27.51 26.59 15 27.36 27.58 27.18 26.85 27.11 27.61 28.09 26.34 27.01 27.38 27.51 26.58 16 27.36 27.60 27.15 26.87 27.13 27.63 27.96 26.34 27.03 27.40 27.52 26.58 17 21.38 27.59 27.13 26.89 27.14 27.66 27.88 26.34 27.05 27.41 27.52 26.59 18 27.38 27.56 27.13 26.91 27.68 27.72 26.36 27.07 27.43 27.52 26.59 19 27.38 27.54 27.15 26.93 27.71 27.57 26.38 27.10 27.44 27.49 26.60 20 27.37 27.53 27.15 26.94 27.15 27.74 27.48 26.41 27.11 27.46 27.49 26.62 21 27.31 27.52 27.09 26.96 27.17 27.75 27.41 26.43 27.12 27.47 27.49 26.62 22 27.22 27.52 27.03 26.98 27.18 27.77 27.39 26.46 27.13 27.48 27.49 26.64 23 27.20 27.53 26.99 21.00 27.20 27.79 27.37 26.48 27.12 27.50 27.48 26.64 24 27.22 27.53 26.97 27.02 21.21 27.81 27.36 26.51 27.14 27.51 27.46 26.65 25 27.21 27.50 26.95 27.04 27.23 27.83 27.36 26.53 27.15 27.52 27.18 26.66 26 27.23 27.43 26.93 27.06 27.24 27.86 27.37 26.55 27.16 27.54 27.04 26.68 27 27.25 27.40 26.90 27.08 27.26 27.87 27.38 26.58 27.., 27.55 26.94 26.70 28 27.26 27.33 26.89 27.10 27.26 27.88 27.38 26.61 27.18 27.56 26.81 26.72 29 27.26 27.19 26.88 27.12 27.28 27.88 27.39 26.62 27.19 27.57 26.75 26.73 30 27.28 27.10 26.88 27.13 27.89 27.41 26.64 27.19 27.54 26.72 26.74 31 27.31 26.89 27.15 27.89 26.66 27.52 26.71 LOW 27.38 27.60 27.20 27.15 27.89 28.09 27.59 27.19 27.57 27.56 26.84 HIGH 27.20 27.10 26.88 26.75 27.30 27.36 26.34 26.69 27.21 26.71 26.58 20 o3 1- 4t u. 1.4 wo 24 zitz -1% La> In 28 WI -I CI Z -5 4 32 ONDJFMAMJJASONDJFMAMJJASONDJFMAMJJAS 1985 1986 1987 1988 400 GROUND-WATER LEVELS RIO CIBUCO BASIN 182615066235300. Local number, 211. LOCATION.--Lat 1826'15", long 66'23'53". Owner: P.R. Aqueduct and Sewer Authority. Name: Rosario No. 2. AQUIFER.--Aguada Limestone. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 14 in (0.36 m) 0-200 ft (0-61.0 m), diameter 12 in (0.30 m) 200-250 ft (61.0-76.2 m), cased 12 in (0.30 m) 0-250 ft (0-76.2 m), perforated 210-250 ft (64.0-76.2 m), diameter 10 in (0.25 m) 250-270 ft (76.2-82.3 m), open hole; concrete sealed 0-200 ft (0-61.0 m). Depth 270 ft (82.3 m). DATUM.--Elevation of land-surface datum is about 215 ft (65.5 m) above mean sea level, from topographic map. Measuring point: Hole on side of casing, 1.15 ft (0.35 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--October 1985 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 191.29 ft (58.30 m) below land-surface datum, May 16, 1986; lowest water level recorded, 193.10 ft (58.86 m) below land-surface datum, Mar. 21, 1986. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 192.37 192.47 192.44 192.38 192.62 192.96 192.51 192.23 192.47 192.66 192.46 2 192.38 192.50 192.46 192.31 192.62 192.96 192.54 192.25 192.47 192.66 192.45 3 192.39 192.51 192.51 192.27 192.62 192.96 192.55 192.27 192.48 192.66 192.45 4 192.39 192.56 192.53 192.26 192.58 192.96 192.57 192.28 192.48 192.66 192.45 5 192.40 192.58 192.56 192.27 192.55 192.96 192.58 192.31 192.48 192.66 192.45 6 192.40 192.60 192.56 192.27 192.50 192.96 192.64 192.33 192.48 192.65 192.45 7 192.41 192.63 192.56 192.27 192.50 192.95 192.64 192.33 192.48 192.65 192.48 8 192.42 192.64 192.56 192.27 192.50 192.95 192.64 192.33 192.50 192.62 192.48 9 192.42 192.66 192.57 192.27 192.50 192.94 192.63 192.33 192.50 192.73 192.48 10 192.43 192.71 192.57 192.29 192.50 192.94 192.60 192.33 192.49 192.73 192.48 11 192.43 192.71 192.57 192.29 192.50 192.94 192.00 192.35 192.51 192.73 192.47 12 192.44 192.71 192.58 192.30 192.50 192.94 191.60 192.37 192.51 192.73 192.41 13 192.45 192.71 192.58 192.31 192.50 192.93 191.50 192.37 192.51 192.73 192.35 14 192.45 192.71 192.58 192.36 192.50 192.93 191.49 192.38 192.53 192.72 192.35 15 192.46 192.71 192.59 192.40 192.50 192.91 191.55 192.40 192.54 192.72 192.35 16 192.46 192.71 192.59 192.43 192.52 192.75 191.66 192.41 192.54 192.72 192.35 17 192.47 192.71 192.58 192.45 192.52 192.59 191.72 192.41 192.58 192.72 192.35 18 192.48 192.71 192.56 192.46 192.54 192.51 191.79 192.42 192.58 192.72 192.35 19 192.48 192.69 192.56 192.46 192.54 192.44 191.87 192.46 192.58 192.72 192.34 20 192.49 192.68 192.56 192.48 192.59 192.40 191.93 192.47 192.58 192.72 192.34 21 192.49 192.65 192.52 192.50 192.64 192.34 191.99 192.48 192.61 192.72 192.34 22 192.40 192.63 192.48 192.51 192.30 192.04 192. 192.64 192.72 192.34 23 192.39 192.62 192.44 192.51 192.93 192.30 192.08 192.48 192.66 192.72 192.34 24 192.39 192.62 192.42 192.51 192.98 192.31 192.12 192.49 192.68 192.71 192.34 25 192.40 192.62 192.42 192.51 192.97 192.37 192.14 192.49 192.68 192.63 192.34 26 192.41 192.62 192.43 192.51 192.98 192.38 192.15 192.49 192.67 192.51 192.33 27 192.41 192.62 192.42 192.54 192.98 192.40 192.20 192.49 192.67 192.49 192.33 28 192.41 192.55 192.41 192.58 192.98 192.40 192.23 192.48 192.67 192.48 192.33 29 192.43 192.48 192.41 192.59 192.98 192.44 192.24 192.47 192.67 192.47 192.33 30 192.45 192.47 192.41 192.60 192.97 192.48 192.24 192.47 192.67 192.46 192.33 31 192.46 192.40 192.62 192.96 192.24 192.67 192.46 LOW 192.49 192.71 192.59 192.62 192.96 192.64 192.49 192.68 192.73 192.48 HIGH 192.37 192.47 192.40 192.26 --- 192.30 191.49 192.23 192.47 192.46 192.33 \\I ONDJ FMAMJJ ASONDJ FMAMJJ ASONDJ FMAMJ J AS 1985 1986 1987 1988 401 GROUND-WATER LEVELS RIO CIBUCO BASIN 182515066194000. Local number, 212. LOCATION.--Lat 1825'15", long 6619'40". Owner: U.S. Geological Survey. Name: Ponderosa TW-1. AQUIFER.--Aguada Limestone-Cibao Formation. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 4 in (0.10 m), cased 4 in (0.10 m) 0-136 ft (0-41.1 m), perforated 121-131 ft (36.9-39.9 m); bentonite packed 0.5-121 ft (0.15-36.9 m). Depth 136 ft (39.9 m). DATUM.--Elevation of land-surface datum is about 98.0 ft (29.9 m) above mean sea level, from topographic map. Measuring point: Shelter floor on top of 4 in (0.10 m) casing, 3.00 ft (0.91 m) above land-surface datum. REMARKS.--Recording observation well. Water levels affected by nearby pumping well. PERIOD OF RECORD.--October 1985 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 63.05 ft (19.22 m; b(1-w land-surface datum, July 15, 1987; lowest water level recorded, 74.63 ft (22.75 m) below land-surface datum, uct. 27,28, 1986. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1987 10 SEPTEMBER 1988 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 66.42 66.87 66.81 66.35 66.59 66.95 68.01 67.39 67.30 68.50 67.06 65.74 2 66.44 66.90 66.61 66.28 66.58 67.00 68.02 67.36 67.41 68.55 67.08 65.83 3 66.47 66.93 66.46 66.22 66.56 67.05 68.04 67.35 67.52 68.58 67.09 65.80 4 66.51 67.00 66.35 66.16 66.53 67.09 68.06 67.36 67.62 68.62 67.10 65.78 5 66.54 67.05 66.27 66.10 66.49 67.14 68.09 67.38 67.71 68.66 67.09 65.77 6 66.57 67.11 66.24 66.06 66.46 67.16 68.20 67.39 67.66 68.69 67.07 65.77 7 66.60 67.15 66.20 66.03 66.43 67.19 68.20 61.40 67.71 68.74 67.08 65.78 8 66.64 67.18 66.17 65.99 66.41 67.22 68.20 67.42 67.76 68.76 67.08 65.81 9 66.69 67.21 66.25 65.98 66.40 67.23 68.23 67.47 67.88 68.82 67.11 65.84 10 66.71 67.25 66.33 65.97 66.40 67.26 68.25 67.97 67.90 68.85 67.10 65.83 11 66.73 67.29 66.41 65.96 66.40 67.31 68.27 68.50 67.99 68.89 67.11 65.82 12 66.77 67.33 66.48 65.96 66.40 67.35 68.61 67.79 68.06 68.91 67.13 65.74 13 66.80 67.37 66.56 65.98 66.40 67.38 68.42 66.00 68.15 68.94 67.15 65.67 14 66.85 67.42 66.63 66.00 66.42 67.40 68.41 65.35 67.61 68.97 67.16 65.61 15 66.91 67.46 66.82 66.04 66.45 67.44 68.43 65.08 66.76 67.84 67.18 65.59 16 66.93 67.50 66.80 66.07 66.48 67.48 68.30 64.90 66.34 67.31 67.20 65.57 17 66.98 67.55 66.80 66.11 66.51 67.54 68.10 64.78 66.21 67.15 67.21 65.54 18 67.01 67.55 66.83 66.13 66.53 67.60 67.94 64.70 66.16 67.08 67.22 65,51 19 67.05 67.54 66.87 66.18 66.55 67.67 67.76 64.66 66.13 67.04 67.22 65.50 20 67.07 67.49 66.89 66.21 66.58 67.71 67.62 64.62 66.11 67.01 67.23 65.53 21 67.07 67.47 66.87 66.25 66.64 67.74 67.51 64.60 67.28 66.98 67.24 65.48 22 66.93 67.46 66.83 66.29 66.67 67.79 67.42 64.58 67.86 66.96 67.25 65.46 23 66.85 67.46 66.80 66.33 66.70 67.80 67.36 64.68 67.94 66.96 67.24 65.45 24 66.80 67.46 66.76 66.36 66.73 67.84 67.32 64.62 68.08 66.96 67.23 65.44 25 66.75 67.47 66.73 66.40 66.75 67.87 67.28 64.62 68.17 66.96 67.00 65.44 26 66.73 67.46 66.69 66.45 66.79 67.92 67.24 64.62 68.23 66.97 66.77 65.44 27 66.74 67.45 66.62 66.49 66.83 67.95 67.26 66.00 68.29 66.99 66.61 65.44 28 66.74 67.40 66.55 66.52 66.86 67.97 67.22 66.64 68.35 67.00 66.30 65.46 29 66.77 67.26 66.47 66.52 66.91 67.98 67.20 66.87 68.39 67.13 66.08 65.48 30 66.80 67.01 66.43 66.53 67.98 67.78 67.03 68.45 67.04 65.91 65.51 31 66.82 66.40 66.55 68.00 67.17 67.05 65.81 LOW 67.07 67.55 66.89 66.55 66.91 68.00 68.61 68.50 68.45 68.97 67.25 65.84 HIGH 66.42 66.87 66.17 65.96 66.40 66.95 67.20 64.58 66.11 66.96 65.81 65.44 WTR YR 1988 MEAN 66.92 LOW 68.97 HIGH 64.58 0 60 F.< W 0 z 70 >14 -J CI Z 1.4 < 1-4 80 ONDJFMAMJJ ASONDJFMAMJJ ASONDJFMAMJJ 1988 1985 1986 1987 402 GROUND-WATER I FVL1S RIO CIBUCO BASIN 182330066185700. Local number, 213. LOCATION.--Lat 18 23'30", long 66- 18'57". Owner: P.R. Aqueduct and Sewer Authority. Name: Pampano No. 2. AQUIFER.--Rio Indio Limestone-Lares Limestone. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 20 in (0.51 m), cased 20 in (0.51 m) 0-130 ft (0-39.6 m), diameter 14 in (0.36 m), cased 12 in (0.30 m) 0-220 ft (0-67.1 m): open hole 220-330 ft (67.6- 100.6 m). Depth 330 ft (100.6 m). DATUM.--Elevation of land-surface datum is about 394 ft (120 m) above mean sea level, from topographic map. Measuring point: Hole on side of casing, 2.95 ft (0.90 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--October 1985 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 34.40 ft (10.50 m) below land-surface datum, Dec. 6, 1985; lowest water level recorded, 49.55 ft (15.10 m) below land-surface datum, May 1, 1986. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY jUN JUL AUG SEP 1 40.96 42.85 43.19 41.93 40.34 40.75 42.92 40.41 37.47 43.39 42.95 2 41.01 42.68 43.16 41.38 40.30 40.85 42.95 40.27 37.55 43.44 42.76 3 41.22 42.56 43.10 41.18 40.15 40.98 43.03 40.20 37.66 --- 42.70 4 41.17 42.58 43.06 40.87 40.05 41.07 43.08 40.38 37.85 42.65 5 41.15 42.61 43.03 40.61 39.92 41.12 43.07 40.41 37.98 - 42.62 6 41.30 42.66 43.03 40.44 39.80 41.13 43.07 40.45 38.07 - 43.74 42.62 • 7 41.40 42.67 42.98 40.2U 39.14 41.23 43.07 40.45 38.16 43.83 42.63 8 41.47 43.24 42.97 40.05 39.65 41.35 43.12 40.51 38.27 43.89 42.68 9 41.56 43.42 42.94 39.92 39.56 41.37 43.22 40.58 38.44 43.97 42.16 10 41.76 43.52 42.92 39.85 39.54 41.39 43.29 40.59 38.57 44.02 42.62 11 41.80 43.62 42.93 39.76 39.53 41.51 43.37 40.18 38.62 44.06 42.58 12 41.86 43.68 42.94 39.45 39.56 41.63 43.46 39.51 38.71 44.12 42.24 13 42.00 43.80 43.05 39.53 39.53 41.68 43.35 38.97 38.85 44.15 41.86 14 42.12 43.89 43.09 39.48 39.59 41.65 43.55 38.49 39.02 44.19 41.62 15 42.13 43.97 43.16 39.48 39.63 41.77 43.58 38.08 39.10 - 44.20 41.45 16 42.11 44.03 43.18 39.48 39.68 41.93 43.18 37.80 39.20 44.31 41.27 11 42.23 44.11 43.17 39.52 39.76 42.06 42.82 37.58 39.35 44.29 41.14 18 42.39 43.99 43.24 39.51 39.74 42.13 42.48 37.38 39.53 --- 44.32 40.99 19 42.41 44.10 43.39 39.57 39.80 42.16 42.22 37.22 39.62 42.20 44.36 40.88 20 42.52 44.05 43.44 39.61 39.90 42.11 41.99 37.07 39.76 42.31 44.40 40.82 21 42.58 44.05 43.25 39.72 39.96 41.91 41.66 36.98 39.81 42.37 44.44 40.21 22 42.56 44.09 43.04 39.78 40.01 42.07 41.42 37.01 39.69 42.47 44.48 40.11 23 42.52 44.04 42.90 39.82 40.07 41.88 41.22 36.99 39.95 42.61 44.51 39.74 24 42.58 44.08 42.80 39.91 40.12 42.19 41.00 36.98 40.09 42.69 44.44 39.53 25 42.63 44.04 42.68 39.95 40.17 42.39 40.80 36.96 40.09 42.79 44.19 39.36 26 42.52 43.91 42.54 39.72 40.22 42.52 40.64 37.00 40.31 42.90 43.72 39.19 27 42.58 43.83 42.40 39.93 40.35 42.59 40.57 37.09 40.43 42.99 43.66 38.85 28 42.57 43.67 42.26 39.96 40.51 42.64 40.47 37.19 40.61 43.07 43.47 38.55 29 42.62 43.34 42.16 40.07 40.66 42.75 40.47 37.27 --- 43.15 43.22 38.71 30 42.65 43.13 42.14 40.18 --- 42.18 40.44 37.32 43.27 43.00 38.70 31 42.73 --- 42.15 40.26 42.85 --- 37.22 43.33 42.98 --- LOW 42.73 44.11 43.44 41.93 40.66 42.85 43.58 40.59 42.95 HIGH 40.96 42.56 42.14 39.45 39.53 40.75 40.44 36.96 - - 38.55 0 25 _1 W 1- < 35 c.) >v) 45 -JO cr Z L.1 4 < 55 ONDJ FMAMJJ ASONDJFMAMJ J AS ONDJ FM AMJ J AS 1985 1986 1987 1988 J \I\ 19 87 19851986 NDJFMAMJJ ASONDJFMAMJJ ASONDJFMAMJJ AS 1988 ti (ROUND-WATER 1 LVEI S RIO DE LA PtAIA 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-table well, diameter 18 in (0.46 m). Depth 100 ft (30.5 m). DATUM.--Elevation of land-surface datum is about 39.0 ft (11.9 m) above mean sea level, from topographic map. Measuring point: Hole on side of casing, 1.10 ft (0.34 m) above land-surface datum. REMARKS.--Recording observation well. Water levels affected by nearby pumping well. PERIOD OF RECORD.-- November 1985 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 18.23 ft (5.56 m) below land-surface datum, Nov. 16, 1985; lowest water level recorded, 20.31 ft (6.19 m) below land-surface datum, Mar. 8, 1987. 403 DAY OCT 1 19.60 2 19.55 3 19.51 4 19.42 5 19.36 6 19.31 7 19.30 8 19.30 9 19.37 10 19.46 11 19.51 12 19.54 13 19.54 14 19.54 15 19.60 16 19.58 17 19.55 18 19.54 19 19.48 20 19.43 21 19.37 22 19.40 23 19.45 24 19.47 25 19.48 26 19.51 27 19.55 28 19.57 29 19.62 30 19.66 31 19.66 LOW 19.66 HIGH 19.30 WATER LEVEL, IN FEET BElOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 INSTANTANEOUS OBSERVATION AT 1200 NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 19.63 19.34 19.25 19.37 19.77 19.90 19.79 19.57 19.72 19.69 19.19 19.57 19.35 19.21 19.38 19.81 19.96 19.80 19.58 19.68 19.74 19.32 19.52 19.40 19.21 19.36 19.82 19.99 19.79 19.59 19.63 19.75 19.39 19.50 19.42 19.22 19.37 19.80 19.98 19.81 19.59 19.65 19.71 19.43 19.51 19.4? 19.23 19.38 19.73 19.97 19.85 19.65 19.70 19.76 19.46 19.56 19.40 19.29 19.42 19.73 19.95 19.82 19.65 19.74 19.80 19.42 19.60 19.46 19.29 19.45 19.75 19.95 19.79 19.65 19.79 19.84 19.37 19.66 19.50 19.32 19.48 19.74 19.91 19.80 19.63 19.88 19.78 19.33 • 19.68 19.51 19.29 19.48 19.71 19.94 19.83 19.69 19.94 19.72 19.21 19.73 19.46 19.33 19.48 19.75 19.95 19.80 19.74 19.93 19.65 19.00 19.71 19.48 19.31 19.45 19.81 19.95 19.56 19.76 19.93 19.61 19.07 19.74 19.50 19.34 19.43 19.88 19.96 19.45 19.73 19.93 19.61 18.84 19.80 19.57 19.33 19.42 19.92 19.94 19.46 19.73 19.92 19.61 18.82 19.78 19.62 19.31 19.46 19.98 19.98 19.46 19.74 19.89 19.62 18.97 19.74 19.60 19.31 19.52 20.01 19.94 19.43 19.73 19.89 19.64 19.06 19.73 19.52 19.28 19.53 19.81 19.43 19.71 19.85 19.66 19.09 19.67 19.43 19.23 19.52 - 19.79 19.40 19.73 19.83 19.64 19.19 19.63 19.39 19.22 19.53 19.74 19.44 19.74 19.82 19.59 19.24 19.60 19.40 19.20 19.54 19.72 19.49 19.76 19.85 19.58 19.26 19.51 19.48 19.25 19.47 19.70 19.51 19./9 19.89 19.64 19.27 19.46 19.42 19.29 19.45 19.66 19.54 19.77 19.92 19.69 19.29 19.49 19.39 19.46 19.48 20.02 19.65 19.55 19.72 19.92 19.71 19.17 19.54 19.34 19.46 19.53 20.03 19.67 19.55 19.71 19.96 19.66 19.10 19.62 19.36 19.43 19.54 20.01 19.71 19.58 19.72 19.95 19.51 19.14 19.41 19.40 19.45 19.58 20.00 19.73 19.60 19.73 19.97 19.12 19.14 19.49 19.39 19.45 19.70 19.97 19.72 19.59 19.79 19.95 19.08 19.08 19.48 19.36 19.40 19.76 19.93 19.73 19.64 19.75 19.92 19.03 19.05 19.03 19.35 19.30 19.78 19.90 19.72 19.64 19.76 19.86 19.04 1941 19.18 19.29 19.30 19.78 19.85 19.75 19.62 19.77 19.80 19.06 1942 19.27 19.29 19.30 --- 19.84 19.78 19.62 19.77 19.72 19.09 19.14 --- 19.29 19.35 19.90 --- 19.59 --- 19.66 19.14 --- 19.80 19.62 19.46 19.78 19.99 19.85 19.:9 19.97 19.84 19.46 19.03 19.29 19.20 19.36 19.65 19.40 19.57 19.63 19.03 18.82 • 18 0 1 18.5 co $__ 1-4 19 w w u.C.) z 4t u- 19.5 w en 20 W I -J CI • 20.5 4 404 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 it in (0.41 m) 0-20 ft (0-6.10 m), cased 12 in (0.30 m) 0-106 ft (0-32.3 m), perforated 20-106 ft (6.10-32.3 m), diameter 10 in (10.25 m) 106-140 ft (32.3-42.7 m), cased 10 in (0.25 m) 106-140 ft (32.3-42.7 m), perforated 106-140 ft (32.3-42.7 m). Depth 140 ft (42.7 m). DATUM.--Elevation of land-surface datum is about 13.0 ft (3.96 m) above mean sea level, from topographic map. Measuring point: Hole on side of casing, 1.80 ft (0.55 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--October 1985 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 9.38 ft (2.86 m) below land-surface datum, June 23, 1987; lowest water level recorded. 14.72 ft (4.49 m) below land-surface dat,,m, Apr. 28. 1986. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 12.22 12.81 12.21 11.87 12.24 11.81 12.25 11.57 11.43 11.89 11.96 10.55 2 12.25 12.81 12.28 11.72 12.16 11.80 12.95 11.59 11.43 11.88 11.99 10.57 3 12.29 12.82 12.37 11.80 12.11 11.97 13.08 11.54 11.35 12.20 11.99 10.62 4 12.30 12.86 12.43 11.80 12.06 12.11 13.13 11.54 11.42 12.38 11.78 10.67 5 12.30 12.90 12.48 11.83 12.07 12.17 13.19 11.50 11.59 12.44 11.79 10.70 6 12.36 12.95 12.44 11.84 12.11 12.20 13.24 11.41 11.56 12.29 11.81 10.74 7 12.39 12.98 12.39 11.86 12.09 12.23 13.28 12.13 11.69 12.20 11.83 10.76 8 12.40 13.01 12.30 11.88 12.08 12.27 13.32 12.23 11.75 12.21 11.67 10.78 9 12.44 13.03 12.30 11.89 12.17 12.29 12.88 12.30 11.85 11.78 11.64 10.61 10 12.48 13.05 12.32 11.90 12.23 12.19 12.87 12.01 11.23 11.75 11.62 10.45 11 12.51 13.10 12.36 11.91 12.25 12.09 12.88 10.99 11.61 11.75 11.99 10.29 12 12.54 13.12 12.40 11.91 12.30 12.07 12.91 10.72 11.91 11.78 12.03 10.07 13 12.57 13.16 12.44 11.93 12.28 12.66 12.90 10.54 11.98 11.77 11.82 10.02 14 12.61 13.19 12.48 11.94 12.13 12.47 12.92 10.46 12.03 11.81 12.07 10.07 15 12.65 13.19 12.39 11.98 12.09 12.46 12.49 10.43 12.10 11.85 12.13 10.12 16 12.b7 13.21 12.36 12.02 12.24 12.50 12.22 10.31 11.55 11.88 12.18 10.12 17 12.65 13.06 12.38 12.12 12.29 12.44 12.36 10.48 12.07 11.90 12.16 10.15 18 12.65 12.93 12.43 12.11 12.30 12.53 12.23 10.72 12.14 11.87 12.09 10.17 19 12.59 12.90 12.46 12.09 12.33 12.56 12.03 10.81 12.16 11.86 12.07 10.22 20 12.25 12.86 12.42 12.10 12.37 12.60 11.98 10.88 12.18 11.89 11.79 10.26 21 12.50 12.86 12.17 12.12 12.40 12.64 11.47 10.90 11.49 11.92 11.11 10.26 22 12.59 12.89 12.12 12.16 12.42 12.68 11.42 10.98 11.40 11.93 11.71 10.25 23 12.61 12.90 12.07 12.18 12.42 12.70 11.46 11.03 12.05 12.26 11.50 10.27 24 12.74 12.86 12.06 12.21 12.02 12.72 11.27 10.85 12.16 12.43 11.29 10.30 25 12.72 12.48 11.9/ 12.20 11.99 12.71 11.39 11.06 12.22 12.48 10.67 10.34 26 12.64 12.47 11.93 12.24 11.98 12.70 11.42 11.10 12.23 12.30 10.65 10.37 27 12.64 12.44 11.89 12.28 11.98 12.68 11.45 11.14 12.26 12.13 10.64 10.40 28 12.67 11.97 11.88 12.30 11.99 12.65 11.49 10.74 12.30 12.12 10.55 10.45 29 12.71 12.01 11.88 12.26 11.90 12.61 11.51 10.79 11.98 12.13 10.52 10.50 30 12.90 12.11 11.91 12.27 12.34 11.55 10.83 11.89 12.00 10.49 10.49 31 12.82 11.94 12.29 12.27 10.87 11.95 10.51 LOW 12.90 13.21 12.48 12.30 12.42 12.12 13.32 12.30 12.30 12.48 12.18 10.78 HIGH 12.22 11.97 11.88 11.72 11.90 11.80 11.27 10.31 11.23 11.75 10.49 10.02 WTR YR 1988 MEAN 11.95 LOW 13.32 HIGH 10.02 l\I\A\11" ONDJFMAMJJ ASONDJFMAMJJ ASONDJFMAMJJ AS 1985 1986 1987 1988 405 GROUND-WATER LEVELS RIO DE LA PLATA BASIN 182655066142400. Local number, 217. LOCATION.--Lat 1826'55", long 66'14'24". Owner: U.S. Geological Survey. Name: Monserrate TW-2. AQUIFER.-Alluvial Deposits. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 4 in (0.10 m), cased 4 in (0.10 m) 0-80 ft (0-24.4 m), perforated 10-80 ft (3.05-24.4 m). Depth 80 ft (24.4 m). DATUM.--Elevation of land-surface datum is about 3.30 ft (1.00 m) above mean sea level, from topographic map. Measuring point: Top of shelter floor, 3.50 ft (1.07 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--November 1985 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 0.02 ft (0.006 m) below land-surface datum, May 16, 1986; lowest water level recorded, 1.92 ft (0.58 m) below land-surface datum, Apr. 12, 1986. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1987 10 SEPTEMBER 1988 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 1.16 1.15 .67 .61 1.00 1.06 1.34 .95 .96 1.25 1.25 .45 2 1.13 1.13 .77 .53 .92 1.08 1.42 .98 .97 1.22 1.28 .54 3 1.12 1.12 .90 .54 .83 1.14 1.47 .97 1.02 1.18 1.31 .59 4 1.08 1.17 .94 .57 .79 1.21 1.48 .99 1.04 1.23 1.15 .65 5 1.04 1.21 .99 .61 .79 1.24 1.47 1.04 1.10 1.27 1.17 .70 6 1.04 1.26 .89 .67 .83 1.25 1.46 1.00 1.13 1.27 1.15 .70 7 1.06 1.29 .92 .69 .86 1.25 1.47 1.04 1.13 1.20 1.19 .71 8 1.07 1.32 .90 .70 .87 1.27 1.46 1.05 1.13 1.21 1.05 .67 9 1.12 1.35 .85 .68 .88 1.29 1.45 1.09 1.19 1.22 1.04 .55 10 1.14 1.35 .85 .70 .90 1.29 1.46 1.05 1.22 1.21 1.01 .32 11 1.17 1.36 .88 .70 .94 1.23 1.47 .46 1.22 1.22 1.00 .29 12 1.19 1.35 .88 .70 .99 1.22 1.48 .34 1.25 1.22 1.03 .08 13 1.19 1.38 .93 ./3 1.00 1.25 1.47 .35 1.27 1.25 1.01 .02 14 1.20 1.38 .97 .72 1.01 1.34 1.49 .35 1.30 1.25 1.06 .15 15 1.23 1.35 .94 .76 1.02 1.32 1.28 .35 1.26 1.28 1.09 .24 16 1.22 1.35 .88 .78 1.04 1.35 .77 .38 1.26 1.28 1.12 .28 17 1.17 1.30 .84 .79 1.03 1.37 .78 .43 1.25 1.27 1.11 .35 18 1.16 1.21 .85 .80 1.01 1.39 .77 .49 1.29 1.25 1.02 .38 19 1.11 1.19 .90 .77 1.00 1.43 .69 .58 1.31 1.25 .98 .42 20 .99 1.14 .94 .81 1.00 1.48 .71 .63 1.33 1.29 1.03 .45 21 1.02 1.11 .78 .85 1.05 1.50 .69 .66 1.28 1.32 1.05 .42 22 1.07 1.13 .73 .87 1.05 1.51 .70 .71 1.19 1.34 1.07 .30 23 1.14 1.18 .65 .87 1.05 1.51 .73 .84 1.16 1.38 .88 .29 24 1.19 1.21 .67 .87 1.03 1.51 .80 .82 1.18 1.41 .74 .30 25 1.17 .88 .67 .89 1.04 1.48 .80 .84 1.19 1.45 .16 .33 26 1.07 .87 .65 .94 1.02 1.46 .81 .84 1.23 1.47 .21 .40 27 1.10 .84 .58 .97 1.01 1.44 .83 .88 1.21 1.42 .22 .43 28 1.11 .19 .59 1.00 1.03 1.41 .86 .91 1.24 1.39 .25 .50, 29 1.13 .38 .59 1.01 1.08 1.37 .88 .91 1.24 1.39 .30 .551 30 1.16 .51 .60 1.00 --- 1.34 .92 .91 1.24 1.30 .32 .58 31 1.16 --- .65 1.03 1.34 --- .91 --- 1.24 .38 --- LOW 1.23 1.38 .99 1.03 1.08 1.51 1.49 1.09 1.33 1.47 1.31 .71 HIGH .99 .19 .58 .53 .79 1.06 .69 .34 .96 1.18 .16 .02 WTR YR 1988 MEAN .98 LOW 1.51 HIGH .02 N 2 NDJ FMAMJJ ASONDJFMAMJJ ASONDJFMAMJJ AS 19851986 1987 1988 406 GROUND-WATER I EVILS RIO HONDO TO RIO PUERIO NIJEVO BASINS 182623066111000. local number, 218. LOCATION.--Tat 1826'23", long 66 11'10". Owner: P.R. Aqueduct and Sewer Authority. Name: Levittown No. 7 . AQUIFER.--Alluvial deposits-Aymamon Limestone. WELL CHARACTERISTICS.--Drilled water-table well. DATUM.--Elevation of land surface datum is about 10.0 ft (3.05 m) above mean sea level, from topographic map. Measuring point: Hole on pump base, 1.55 ft (0.47 m) above land-surface datum. REMARKS.--Recording observation well, water levels affected by nearby pumping well. PERIOD OF RECORD.--October 1985 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 6.13 ft (1.87m) below land-surface datum, Feb. 22, 1987; lowest water level recorded, 9./7 ft (2.98 m) below land-surface datum, Mar. 23, 1986. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUT AUG SEP 1 7.58 7.65 7.46 6.90 7.20 7.47 7.85 6.92 7.22 8.15 7.77 6.59 2 7.56 7.64 7.51 6.91 7.19 7.48 7.86 6.96 7.23 8.14 7.80 6.71 3 7.60 7.63 7.58 6.90 7.15 7.54 7.85 6.97 7.27 8.36 7.80 6.77 4 7.56 7.64 7.49 6.89 7.15 7.60 7.84 6.96 7.28 8.41 7.73 6.70 5 7.54 7.66 7.49 6.90 7.15 7.61 7.87 7.01 7.32 8.38 7.74 6.73 6 7.56 7.67 7.38 6.92 7.17 7.64 7.83 6.97 7.38 8.33 7.79 6.71 7 7.56 7.71 7.39 6.91 7.17 7.63 7.05 6.99 7.44 7.85 7.80 6.71 8 7.53 7.75 7.37 6.93 7.20 7.65 7.83 7.00 7.82 7.83 7.48 6.72 9 7.55 7.81 7.34 6.94 7.18 7.70 7.81 7.07 8.11 7.81 7.55 6.61 10 7.55 7.82 7.30 6.96 7.19 7.69 7.81 6.98 8.17 7.78 7.52 6.52 11 7.56 7.85 7.31 6.94 7.22 7.71 7.82 6.70 8.21 7.77 7.50 6.47 12 7.59 7.86 7.31 6.96 7.25 7.72 7.81 6.61 8.23 7.78 7.49 6.23 13 7.63 7.86 7.34 6.97 7.26 8.39 7.79 6.51 8.25 7.77 7.50 6.16 14 7.63 7.87 7.37 6.98 7.28 7.82 7.79 6.48 8.29 7.77 7.48 6.17 15 7.66 1.86 7.34 6.97 7.28 7.78 7.72 6.43 8.29 7.78 7.50 6.19 16 7.67 7.87 7.31 6.98 7.28 7.81 7.14 6.45 7.97 7.57 7.52 6.21 17 7.65 7.80 7.28 7.04 7.30 7.82 7.07 6.46 7.93 7.53 7.50 6.25 18 7.63 7.75 7.26 7.10 7.31 7.85 7.02 6.49 7.95 7.51 7.41 6.28 19 7.62 7.71 7.28 7.03 7.31 7.88 6.94 6.53 7.97 7.73 7.47 6.32 20 7.53 7.64 7.30 7.03 7.34 7.91 6.92 6.60 7.99 7.78 7.51 6.36 21 7.51 7.60 7.18 7.05 7.37 7.96 6.83 6.68 8.14 7.83 7.53 6.39 22 7.52 7.60 7.11 7.07 7.37 7.98 6.82 7.36 8.13 7.79 7.53 6.37 23 7.56 7.61 7.02 7.09 7.40 8.00 6.82 7.50 8.13 7.87 7.36 6.38 24 7.58 7.67 6.99 7.09 7.42 7.96 6.84 7.02 8.15 7.86 7.25 6.42 25 7.59 7.62 6.99 7.11 7.42 7.97 6.85 7.02 8.16 7.92 6.86 6.43 26 7.45 7.59 6.97 7.14 7.43 7.94 6.84 7.06 8.18 7.90 6.76 6.43 27 7.47 7.53 6.94 7.16 7.40 7.93 6.85 7.15 8.16 7.88 6.68 6.38 28 7.50 7.38 6.92 7.16 7.41 7.91 6.86 7.19 8.17 7.87 6.65 6.50 29 7.54 7.30 6.88 7.15 7.46 7.89 6.87 7.17 8.16 7.85 6.62 6.54 30 7.69 7.39 6.88 7.17 --- 7.87 6.90 7.07 8.17 7.79 6.59 6.58 31 7.66 --- 6.89 7.20 7.86 --- 7.18 --- 7.77 6.59 --- LOW 7.69 7.87 7.58 7.20 7.46 8.39 7.87 7.50 8.29 8.41 7.80 6.77 HIGH 7.45 7.30 6.88 6.89 7.15 7.47 6.82 6.43 7.22 7.51 6.59 6.16 WTR YR 1988 MEAN 7.37 LOW 8.41 HIGH 6.16 0 6 LaJ CO < lal w la- I la. 8 w- v, W I - 1 aZ 4C J 10 ONDJ FM AMJ J ASONDJ FMAMJJ ASONDJ FMAMJJ AS 1985 1986 1987 1988 407 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 (73.7-82.3 m). Depth 270 ft (82.3 m). DATUM.--Elevation of land-surface datum is about 66.0 ft (20.1 m) above mean sea level, from topographic map. Measuring point: Hole on side of casing, 0.75 ft (0.23 m) above land-surface datum. Prior June 30, 1986, top of shelter floor, 3.59 ft (1.09 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--December 1985 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 38.10 ft (11.61 m) below land-surface datum, June 16, 1986; lowest water level recorded, 43.32 ft (13.20 m) below land-surface datum, Mar. 15, 1987. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 41.66 40.10 40.38 39.66 40.60 41.67 42.37 40.32 40.31 40.94 40.87 39.49 2 41.71 40.11 40.38 39.53 40.51 41.74 42.35 40.30 40.35 40.94 40.89 39.47 3 41.73 40.24 40.27 39.48 40.43 41.82 42.33 40.35 40.38 40.94 40.90 39.38 4 41.70 40.39 40.21 39.46 40.31 41.86 42.32 40.44 40.44 40.95 40.89 39.35 5 41.68 40.55 40.24 39.47 40.28 41.86 42.29 40.47 40.49 40.96 40.86 39.34 6 41.71 40.71 40.27 39.50 40.28 41.84 42.26 40.47 4U 40.93 40.84 39.37 7 41.73 40.81 40.22 39.53 40.31 41.86 42.25 40.48 40.52 40.82 40.85 39.40 8 41.66 40.77 40.08 39.59 40.31 41.90 42.26 40.50 40.56 40.68 40.76 39.50 9 41.56 40.75 39.96 39.64 40.32 41.91 42.29 40.53 40.62 40.58 40.70 39.41 10 41.40 40.77 39.94 39.71 40.45 41.95 42.31 40.56 40.69 40.53 40.61 39.08 11 41.23 40.82 39.99 39.77 40.52 42.01 42.29 40.43 40.68 40.54 40.59 38.84 12 41.12 40.92 40.06 39.81 40.58 42.06 42.33 40.24 40.69 40.52 40.62 38.68 13 41.09 41.07 40.21 39.85 40.60 42.07 42.32 40.12 40.73 40.52 40.66 38.49 14 41.12 41.18 40.30 39.84 40.65 42.06 42.36 40.01 40.78 40.57 40.68 38.43 15 41.03 41.30 40.36 39.86 40.71 42.14 42.33 39.89 40.80 40.66 40.70 38.42, 16 40.96 41.41 40.27 39.92 40.78 42.24 42.00 39.83 40.81 40.69 40.73 38.41 17 40.84 41.47 40.27 39.97 40.83 42.32 41.72 39.81 40.84 40.69 40.80 38.40 18 40.69 41.44 40.38 40.00 40.87 42.37 41.49 39.82 40.87 40.69 40.76 38.36 19 40.58 41.34 40.48 40.06 40.96 42.36 41.25 39.85 40.88 40.69 40.77 38.37 20 40.54 41.26 40.46 40.10 41.04 42.39 41.02 39.87 40.90 40.70 40.76 38.44 21 40.54 41.24 40.21 40.15 41.12 42.39 40.82 39.88 40.87 40.70 40.76 38.49 22 40.54 41.22 39.99 40.23 41.20 42.42 40.74 39.90 40.86 40.70 40.78 38.52 23 40.57 41.20 39.86 40.27 41.24 42.44 40.72 39.99 40.87 40.74 40.73 38.56 24 40.55 41.14 39.78 40.32 41.30 42.45 40.68 40.02 40.90 40.73 40.54 38.60 25 40.43 40.89 39.74 40.38 41.36 42.47 40.47 40.03 40.90 40.74 40.28 38.63 26 40.15 40.75 39.69 40.49 41.42 42.47 40.32 40.07 40.92 40.75 40.04 38.65 27 40.04 40.59 39.62 40.55 41.51 42.47 40.29 40.13 40.95 40.80 40.00 38.71 28 40.00 40.46 39.61 40.61 41.56 42.46 40.30 40.16 41.00 40.81 39.87 38.76 29 40.02 40.35 39.57 40.60 41.63 42.46 40.32 40.17 40.96 40.83 39.76 38.81 30 40.02 40.30 39.62 40.60 42.42 40.33 40.19 40.93 40.86 39.59 38.83 31 40.07 39.71 40.62 42.40 40.23 40.86 39.49 LOW 41.73 41.47 40.48 40.62 41.63 42.47 42.37 40.56 41.00 40.96 40.90 39.50 HIGH 40.00 40.10 39.57 39.46 40.28 41.67 40.29 39.81 40.31 40.52 39.49 38.36 WTR YR 1988 MEAN 40.62 LOW 42.47 HIGH 38.36 0 36 --IX Ci 38 ZQ -"a- 40 >v) Jo 42 Ce Z 4 44 DJ FMAMJ J ASONDJFMAMJJ ASONDJ FMAMJ J AS 1985 1986 1987 1988 r \I\ 1986 1987 1988 FMAMJJ ASONDJ FMAMJJ ASONDJ F W +4 m • cl +2 La La z< 0 --J La.l - > -J Lai 2 IX Z aJ 4 MAMJ AS GROUND-WATER LEVELS RIO HONDO 10 RIO PUERTO NUEVO BASINS 182413066044000. Local number, 220. LOCATION.--tat 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 (U- 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 flour, 3.00 ft (0.91 m) above land-surface datum. REMARKS.--Recording observation well. Water levels affected by nearby pumping well. PERIOD OF RECORD.--February 1986 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, +2.99 ft (+0.91 m) above land-surface datum, Feb. 6, May 8-9, 1986; lowest water level recorded, 0.90 ft (0.21 m) below land-surface datum, Oct. 16, 1986. DAY OCT WATER LEVEL, IN FEET NOV DEC BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1987 INSTANTANEOUS OBSERVATION AT 1200 JAN FEB MAR APR MAY JUN TO SEPTEMBER 1988 JUL AUG SEP 1 .22 • .23 .1.01 '1.04 + .96 + .51 • .29 .1.09 .79 .75 + .56 +1.01 2 .27 • .20 +1.07 +1.04 +1.06 .48 • .28 *1.09 + .75 • .78 . .53 + .99 3 .19 + .16 +1.08 +1.04 +1.09 + .44 + .27 .1.06 .72 .78 + .52 + .86 4 .12 + .16 .1.08 .1.05 +1.11 + .41 * .26 +1.02 + .68 .77 .55 .82 5 .03 + .11 .1.08 .1.04 +1.11 + .40 . .25 + .98 + .65 .74 .53 • .78 6 .02 + .05 +1.08 .1.04 .1.11 + .39 .25 + .95 + .62 + .72 + .50 .73 7 .02 * .01 +1.08 +1.04 +1.11 * .38 + .24 * .92 * .61 + .84 + .47 + .70 8 .00 .00 +1.09 +1.03 +1.11 + .35 + .23 + .88 + .57 + .97 + .44 + .66 9 .00 .01 .1.10 +1.03 +1.11 + .35 + .19 + .85 + .55 + .98 + .41 + .86 10 .01 .04 +1.10 +1.02 +1.08 + .33 + .16 + .97 .52 * .98 + .39 +1.05 11 .01 .07 +1.10 +1.02 +1.02 + .31 .14 +1.09 • .52 + .95 . .47 +1.11 12 .02 .10 +1.09 +1.00 * .99 + .29 * .11 +1.11 + .51 . .94 + .49 +1.12 13 .05 .08 +1.09 +1.00 + .96 + .27 + .12 +1.11 + .49 * .91 . .48 +1.13 14 .07 .09 +1.07 +1.00 + .92 + .27 + .08 +1.12 • .46 + .90 + .47 +1.13 15 .02 .11 +1.07 +1.00 + .87 • .25 + .25 +1.11 + .51 + .88 . .45 .1.13 16 + .04 .11 +1.07 + .97 + .84 + .21 + .59 +1.13 • .54 .85 + .48 .1.13 17 + .09 .05 +1.06 + .94 + .79 + .18 + .75 +1.12 * .53 .81 + .49 +1.13 18 .18 * .02 +1.05 • .95 + .78 + .15 + .97 +1.12 + .53 • .85 + .55 +1.13 19 + .24 + .02 +1.02 + .94 + .75 + .14 +1.09 +1:11 + .52 + .81 + .55 +1.13 20 + .24 + .08 +1.05 + .94 + .72 + .12 .1.09 +1.10 + .52 + .79 .52 +1.12 . . 21 * .22 + .11 +1.05 * .90 + 68 . .09 +1.09 +1.11 + .57 .77 + .49 *1.12 22 + .20 + .11 +1.06 + 65 . .08 .1.09 +1.09 + .61 + .77 + .49 +1.11 23 .18 + .15 .1.07 + 63 + .07 +1.08 +1.07 + .60 + .76 + .50 +1.11 24 + .15 + .24 *1.07 + 63 + .05 *1.09 +1.04 + .61 + .74 + .68 *1.11 25 + .22 + .43 +1.07 + 63 f .10 +1.10 +1.01 . .60 + .72 + .87 .1.10 26 * .30 + .58 +1.06 + .61 + .15 .1.10 + .98 + .58 * .70 + .98 .1.09 27 + .32 + .80 +1.06 + .87 + .60 + .15 +1.10 + .95 + .57 + .68 .1.00 .1.05 28 * .31 + .98 +1.06 + .85 + .57 + .20 +1.10 + .91 + .53 + .64 +1.02 +1.00 29 + .28 +1.06 +1.06 * .91 + .54 + .25 +1.10 + .88 + .67 + .62 +1.03 + .97 30 + .26 +1.06 +1.04 + .90 + .28 +1.09 • .85 + .73 + .60 +1.04 + .94 31 + .24 +1.04 + .90 + .29 + .82 + .58 +1.02 LOW .27 .11 +1.01 + .54 + .05 + .08 + .82 .46 + .58 + .39 + .66 HIGH + .32 +1.06 +1.10 +1.11 + .51 +1.10 +1.13 + .79 * .98 +1.04 +1.13 408 + Above land-surface datum. 409 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-CiLao Formation. WELL CHARACTERISTICS.--Drilled water-table well, diameter 4 in (0.10 m), cased 4 in (0.10 m) 0-107 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.--Recording observation well. PERIOD OF RECORD.--December 1985 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 1.34 ft (`1.41 m) below land-surface datum, Apr. 16, 1988; 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 1987 TO SEPTEMBER 1988 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY YIN JUL AUG SEP 1 11.47 9.30 6.33 6.02 6.71 7.67 7.72 5.35 6.59 6.25 1.55 5.49 2 11.60 9.37 5.44 5.45 6.31 7.72 7.77 5.51 6.68 6.27 7.62 5.60 3 11.46 9.47 4.42 5.34 5.78 7.76 7.84 5.71 6.76 6.44 7.67 5.76 4 10.81 9.47 5.U5 5.45 5.59 7.79 7.89 5.83 6.88 6.56 7.63 5.87 5 9.33 9.52 5.48 5.63 5.86 7.82 7.96 5.93 6.95 6.66 7.72 6.00 6 9.18 9.63 4.52 5.81 6.15 7.85 8.02 6.01 7.01 6.78 7.79 6.10 7 9.17 8.30 4.98 5.74 6.38 7.91 8.09 6.13 7.09 5.23 7.84 6.19 8 9.24 9.13 3.58 5.86 6.54 7.96 8.17 6.24 7.21 5.56 7.90 6.30 9 9.28 9.44 4.20 5.99 6.67 7.98 8.26 6.26 7.32 5.72 7.96 5.45 10 9.34 9.67 4.71 6.14 6.80 7.99 8.36 5.11 7.34 5.82 7.99 3.97 11 9.39 9.86 5.15 6.21 6.86 8.05 8.45 4.25 7.38 5.95 7.60 2.29 12 9.46 10.04 5.50 6.28 6.88 8.10 8.52 4.55 7.39 6.09 7.53 3.41 13 9.57 9.54 5.73 6.38 6.85 8.14 8.50 4.88 7.48 6.24 7.61 3.43 14 9.67 8.82 5.86 6.10 6.91 8.18 8.57 5.06 7.53 6.29 7.68 4.25 15 9.72 9.63 6.00 6.24 6.95 8.24 4.43 5.22 7.57 6.44 7.74 4.59 16 9.76 9.99 6.08 6.37 7.04 8.32 2.75 5.20 1.60 6.54 7.82 4.81 17 9.47 10.00 6.22 6.48 7.13 8.37 4.20 5.42 7.66 6.64 7.68 4.96 18 9.00 9.85 6.22 6.55 7.17 8.40 2.97 5.61 7.63 6.71 7.44 5.11 19 8.93 9.81 6.36 6.51 7.25 8.43 4.06 5.74 7.61 6.69 7.47 5.23 20 8.93 9.75 5.92 6.52 7.29 8.48 4.56 5.81 7.60 6.78 7.54 5.26 21 8.96 9.80 4.65 6.57 7.33 8.51 4.86 5.46 7.48 6.89 7.62 5.35 22 8.89 9.92 4.65 6.68 7.36 8.56 5.13 5.56 7.10 6.96 7.67 5.44 23 8.90 10.08 5.02 6.80 7.40 8.62 5.32 5.64 7.07 /.03 7.65 5.53 24 8.90 9.86 5.26 6.90 7.41 8.66 5.45 5.68 7.11 7.09 1.31 5.64 25 8.85 8.49 5.47 6.92 7.43 8.43 4.49 5.76 7.12 7.20 4.85 5.73 26 8.84 7.92 5.62 6.99 7.51 8.41 4.42 5.89 7.21 7.27 5.25 5.83 27 8.85 6.30 5.68 7.04 7.55 8.18 4.22 6.02 7.31 7.34 5.44 5.93 28 8.93 5.72 5.72 7.05 7.58 7.97 4.61 6.09 7.40 7.41 5.48 6.05 29 9.01 5.66 5.84 6.98 7.63 7.93 4.96 6.23 6.58 7.44 4.77 6.11 30 9.12 6.05 5.98 6.91 --- 7.73 5.18 6.35 6.19 7.48 5.07 6.21 31 9.19 --- 6.09 6.95 7.68 --- 6.45 --- 7.47 5.28 --- LOW 11.60 10.08 6.36 7.05 7.63 8.66 8.57 6.45 7.66 7.48 7.99 6.30 HIGH 8.84 5.66 3.58 5.34 5.59 7.67 2.75 4.25 6.19 5.23 4.77 2.29 WTR YR 1988 MEAN 6.94 LOW 11.60 HIGH 2.29 \\.\ AK).1•\\A, NfrNki. DJ FMAMJJ ASONDJFMAMJJ ASONDJFMAMJ J AS 1985 1986 1987 1988 410 GROUND-WATER LEVELS RIO GRANDE DE LOIZA BASIN 182515065594100. Local number, 222. LOCATION.--Lat 1825'15", long 65'59'41". Owner: U.S. Geological Survey. Name: Campo Rico TW-1. AQUIFER.--Surficial Deposits. WELL CHARACTERISTICS.--Drilled unused water-table well, diameter 4 in (0.10 m). Depth 100 ft (30.5 m). DATUM.--Elevation of land-surface datum is about 10.0 ft (3.05 m) above mean sea level, from topographic map. Measuring point: Hole on side of casing, 0.80 ft (0.24 m) above land-surface datum. Prior July 28, 1986, top of shelter floor, 3.10 ft (0.94 m) above land-surface datum. REMARKS.--Recording observation well. PERIOD OF RECORD.--February 1986 to current year. EXTREMES FOR PERIOD OF RECORD.--Highest water level recorded, 4.42 ft (1.35 m) below land-surface datum, Aug. 31, 1986; lowest water level recorded, 7.42 ft (2.2b m) below land-surface datum, Feb. 9, 1986. WATER LEVEL, IN FEET BELOW LAND-SURFACE DATUM, WATER YEAR OCTOBER 1987 TO SEPTEMBER 1988 INSTANTANEOUS OBSERVATION AT 1200 DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 5.91 5.73 5.63 5.49 5.72 5.72 5.89 5.93 5.86 5.79 5.70 5.51 2 5.76 5.16 5.63 5.63 5.50 5.15 6.04 5.94 5.86 5.14 5.81 5.65 3 5.76 5.63 5.65 5.66 5.62 5.97 6.10 5.82 5.83 5.72 5.79 5.85 4 5.68 5.57 5.60 5.65 5.67 6.09 6.09 5.88 5.82 5.76 5.96 5.93 5 5.55 5.53 5.60 5.64 5.71 6.14 6.07 5.92 6.00 5.88 6.13 5.93 6 5.48 5.58 5.53 5.67 5.82 6.10 6.04 5.81 5.99 6.04 6.11 5.86 7 5.48 5.63 5.66 5.69 5.83 5.99 5.98 5.77 6.03 6.07 6.15 5.76 8 5.47 5.78 5.67 5.77 5.87 6.09 5.81 5.77 6.02 6.28 6.10 5.68 9 5.57 5.81 5.14 5.71 5.84 6.12 5.96 5.76 6.13 6.36 5.96 5.35 10 5.71 5.91 5.72 5.78 5.81 6.08 5.89 5.79 6.19 6.28 5.81 5.20 11 5.78 5.90 5.53 5.71 5.80 5.89 5.86 5.79 6.23 6.13 5.72 5.35 12 5.74 5.94 5.77 5.80 5.82 5.89 5.89 5.83 6.11 6.10 5.63 5.19 13 5.76 6.03 5.83 5.75 5.81 5.91 5.85 6.04 6.05 6.02 5.55 5.15 14 5.75 5.96 5.87 5.71 5.17 5.87 5.89 6.06 6.03 5.87 5.53 5.34 15 5.74 5.87 5.88 5.70 5.73 S.82 5.12 5.95 6.02 5.90 5.58 5.41 16 5.18 5.86 5.83 5.60 5.52 5.81 5.