USVI Public Records

Document text

arc ey ne earn e Ta a Sana ETP SER: — perme povemnreeneren = Beecae ~* ies =, = T me — asta eae ea =~ as ies ee ce. Sassimenainy sete BSS een fii wrens 5 ag ge sioy Pattess aoe ne ~~" a See SS erence —————— = Far ng > ae retain anena Smee io tnanw eee Se este cereal ne Satan eater ae mea aa Locke ame rte AO Ute: lremerie.re BAe Pee SAE ey wert eter Seyhes eho ate hag grains ogee Taio ecescokeies ant nena entation ‘= = SPEEA Gees Sh See > Ee paeyee WSF = -i52 aac sa so = eens See eeArg near prshesesy eee —_- -— mie = r= Saar saaeey esoniearee: Feed a ——— ny Cee ere Te Le ne a er re EL ae et ree ets Se > = ee a eg or tne i tn ee I jeer RAAT as reer 7: RRS ISAE EHTS pa a Aa ON ICT I ae 2 == ae) “S= iss a aS = ——: a = as cor = he “is. iS alee eee = == —--~ =e = a eel a — ny need a Rides eta iaieaa aa eTn mpeanys pore nceeencneny += = ~ Zam as sen SP TE EET TES SS ER Se te cesenkal ee REA I —— ne ponewettreede 4 nee ane — were eros Dapna-cigeeneiemsaianaenecoiaiendaetaeatene sete mee Noes ~ = —~< nae ve he xs ae tice —Z a iow = SS Fs Se ee — — ——~ 2 a oes — $3 ae r oe ae SO ron ae a as a oS pie = as As ms = murs a ae — = = 3 bia @ e ear: ee sae oN. i Noe ‘Sie ee me xR eae ee Ar Si ce pers) x4 B. & Sel me a. ee Pa % nay sek a = sl si TRIS aD a ae Sen ~—p ai “h p< eas Kl csie ia pa Vere WS Sai ea oe a ~ PPE as eeeree Fate PEP Nee! 18 PS oe 7 Badr oe 2 tw bee =F A ee 1 res ‘hey ty ots 7 a er he vind bas be NAS said pina Bens t yee ae i“ me, re ey te x i terry z x Re = ae a —wtre Edited 9 ¥ ‘ J. Hari Krishna, Vicente Quifones-Aponte, Fernando Gomez-Gémez and Gregory Morris — iD ve Pip a Ea i PR mig Gee ener pepe BRS ey oe cage She Lt at ay a a ae See ii ‘Z “ Ress = rang me _ te ti ee Sion eos pie St, Ses wakuinke Tes fe rs ea ie oH se ad Se rae AY Tea Ks ce “ ia ahs Settee re ea ae us ee 3h <2 a By * ae av ae ak “y heb Hae ae rac Sit + ate ron ithe trtonbsite sister pore bee ineet 8 ie Beh. vee Pe. Beg oran ne pipe cos ay Ae TRE tes4 os Fee Shoe se re ER at sf 35 we on oe Pay: we = Bias Pore ig = a eae Be vari eet ween aa ie Ye finn eet <a She 3 +S ES Lae v3 ea ae ak des - ust ee PS ete roe “4 be 5 os % Soper Shree eae By weky Shp ae aan hy ma ay Ne mts. wees bass mot pets Bia li PF 7 See Ae ie oa Sia tes ee SS PPS abe eas on aos ae eagh ow b “2 Se a bor} aia aS oy a eae maa { iwhcn = 7 ae. etna aid a aa a © oe age CF ai. 2p > FEO Jee risen sa «6, +. a +3 A 3 ees +93) 5 paw! tab: ee. a jae ee ot es Sie ews Bee aes Be Ren or aks baat PFs se Fed By = SA wee ty eee en Soy $5 =o Day: he ey ee cs pre oa $2, aera Ky 33 5 a ate Soe POPS al SUSE oi ee eee os Rey Sn, + pated se eties =a in tases Senet ae, eos ce ieee wee aia Senet Pe oe Zapreties = tee Gs Soar ne a we 05 ee — i = oa +78 Se Tey Soe reer Ns W RA ~ cia vee ne pete ered ed omnes. rs a = we: a ba x3 Ne ee ~~ aca om = Fe babe re me a “s ed aw tf er ASS — 3B +4 =-: peewe rae St = —. 3. yee =e SUS; Sige => Var pen ae ar oa ees pe moe “ ae cies sas Sree —enetnaye See eg a ee eaee wok os sa gsabey oe Soci neem. fe a er na = = 9 on Ae = tier prea eae Serpater: caenyntee Sener —— opt nines ow ome pr nennnwneses = whtewtenrater — pine ree erty ornate <=: as mr _— ie sae pe “ oe = ve audi Se Snow os San ee = ce ee aS eins sh Rene aot. . ate her a eid ge ~ ee lantern we SF om aes be ee aia ip om =i wie ay seat doi ISU = ape <2. Soy Soars oe Siesta el peatas Teyy zu 3 simed = Laban x Tone thy TERT ra FUN dea te eee oe tee xs Se aed! > oa aoe es egieeg Ree Sy; BK Sik = Cie tert epitome twins iianns eS Gpry ens - 5 wn Fe: Toys a == —— a at. wYrquwee te ae Sie ae 5 ey ss ~teS ce sed it) ras! age AOE 2 aes mT SE. 2 i flare nares robbs gee SAPP set si Ses meee eect Dee. See ae a araded ‘ TROPICAL HYDROLOGY AND CARIBBEAN WATER RESOURCES | PROCEEDINGS OF THE INTERNATIONAL SYMPOSIUM ON TROPICAL HYDROLOGY AND FourTH CARIBBEAN ISLANDS WATER RESOURCES CONGRESS . Edited by . J. Hari Krishna, Vicente Quiffones-Aponte, Fernando Gémez-Gomez, and Gregory L. Morris Sponsored by the AMERICAN WATER RESOURCES ASSOCIATION Co-Sponsored by . U.S. GEOLOGICAL SURVEY, WATER RESOURCES DIVISION | WATER RESOURCES RESEARCH INSTITUTE UNIVERSITY OF PUERTO RICO _ WATER RESOURCES RESEARCH CENTER UNIVERSITY. OF THE VIRGIN ISLANDS UNITED NATIONS EDUCATIONAL SCIENTIFIC _AND CULTURAL ORGANIZATION Hosted by ASOCIACION PUERTORRIQUENA DE RECURSOS DE AGUA Sands Hotel and Casino Beach Resort . San Juan, Puerto Rico July 22-27, 1990 ee | So € : et a S A ey By AMERICAN WATER RESOURCES ASSOCIATION 5410 Grosvenor Lane, Suite 220 Bethesda, Maryland 20814-2192 PREFACE The tropics give rise to the world’s largest and longest rivers, and span a diversity of climates ranging from the snow cloud Andean peaks to the coastal mangrove forests. Insular areas in i the tropics include some of the highest population densities in the world. Unfortunately, there is a relative paucity of research on water resources in tropical areas. This contrasts with the level of research undertaken in temperate zones, as well as with the urgent economic and environmental concerns of tropical regions of the world. In the absence of ‘ adequate research, there is a tendency to make development decisions based on inadequate information, and to extrapolate temperate zone approaches to tropical zone problems where they may not necessarily be applicable. When these concerns are viewed in the context of the absolute size and high growth rate of the human population in tropical areas, their socio-economic ‘needs, and the types and magnitudes of water resource management decisions being made, the need for a substantial increase in research as well as a major effort.to disseminate knowledge becomes clear. ‘The difficulties facing decision makers, researchers, and environmentalists within the tropics and in particular within insular areas are many. Working toward an improvement of the general well being, a symposium was organized to bring together an interdisciplinary group of scientists ' and managers devoted to the water resources sciences. The “International Symposium on Tropical Hydrology” was organized in conjunction with the Fourth Caribbean Islands Water Resources Congress to: 1) promote technology transfer between the various disciplines; 2) provide a forum for | _ professionals to exchange experiences, ideas, and potential development of new research studies; 3) provide a source for communication with those who are not water scientists; and 4) provide a forum for the discussion of common water resources management problerns. ‘Authors presented studies from about 19 different countries. Over 80 papers were presented orally or by poster. Fixty-six (56) papers were accepted for publication in the Proceedings and are arranged in four major sections: 1) Water Resources Management, 2) Surface Water Hydrology, 3) Ground Water Hydrology, and 4) Water Quality. Papers within all four sections range from , conceptual descriptive papers to very complex research experiments. These included papers describing: water management problems, strategies, and new techniques for the management of water resources; rainfall runoff modeling in tropical environments; extreme flow forecasting; ‘reservoir operation; erosion, sedimentation, and landslide problems; ground water problems on small tropical islands; geophysical techniques for the study of fresh water lenses; application of numerical techniques to ground water problems; computer developments for the handling of . ground water data; baseline water quality data and stable isotopic studies; effects. of land ‘development on water quality; tracer techniques, drinking and waste water treatment; and bacteriological water quality studies. Papers included in the Proceedings have been reviewed by at least one of the editors and an outside referee. ' It is our hope that these Proceedings will serve as an impetus to promote further research and better understanding of the water resources of tropical and insular areas, and that this . knowledge c can be translated into better water management for the benefit of all. d. Hari Krishna Vicente Quiffones -Aponte, Fernando Gomez-Gomez, and Gregory L. Morris | Editors iii Lr ARTS AND DRAFTING OF COVER ILLUSTRATION BY RAFAEL MEDINA AMERICAN WATER RESOURCES ASSOCIATION TECHNICAL PUBLICATION SERIES 7 TPS-90-2- os . , LIBRARY OF CONGRESS CATALOG. CARD NUMBER: 90-81063 1990 COPYRIGHT BY THE AMERICAN WATER RESOURCES ASSOCIATION AN rights reserved. No part of this book may be reproduced in any form or by any mechanical means without permission by the publisher. These proceedings were published by the American Water Resources Association, 5410 Grosvenor Lane, Suite 220, Bethesda, Maryland 20814-2192. The views and statements advanced in this publication are solely those of the authors and do not represent official views or policies of the editors or of the American Water Resources Association; the U.S. Geological Survey, Water Resources Division; the Water Resources Research Institute, University of Puerto Rico; the Water Resources Research Center, University of the Virgin Islands; or the United Nations Educational Scientific and Cultural Organization. Communications in regard to this publication should be sent to the Circulation Department of the American Water Resources Association, 5410 Grosvenor Lane, Suite 220, Bethesda, Maryland 20814-2192, (301) 493-8600. __ ACKNOWLEDGMENTS The organization of the symposium was possible due to the dedicated : effort by many individuals and organizations. We must recognize the support _§- provided by.the sponsoring organizations. Special thanks goes to the & Caribbean District of the U.S. Geological Survey, WRD, who provided ‘manpower, materials, and use of facilities for most of the organizing committee meetings. Also, the organizing committee is grateful to many other individuals who contributed their time and effort in accomplishment of . - the symposium. | The editors acknowledge the assistance and cooperation of the following 7 persons. in organizing and preparing the Proceedings: Ms. Ana V. Sanchez & Ms. Carmen M. Torrens U.S. Geological Survey, Water Resources Division — Ms. Ada Sotto Gregory Morris and Associates We greatly appreciate the time and effort of many individuals who reviewed the manuscripts which were submitted. Thanks to the authors for their cooperation during the process of revision. SYMPOSIUM ORGANIZING COMMITTEE Rafael Mufioz- Candelario, General Chairperson Water Resources Research Institute — University of Puerto Rico © Mayagtiez Campus '.. RO. Box 5000 Mayagiiez, Puerto Rico 00708 _ Alton Robertson - Vicente Quifiones-Aponte Law Environmental Services-Caribe U.S. Geological Survey, WRD: 54-56 Bolivia Street ) GPO Box 4424 Hato Rey, Puerto Rico 00917 - a San Juan, Puerto Rico 00936 SUB-COMMITTEES FINANCE | EXHIBITS , Ramén Amador, Chairman - Eugenio Ascencio, Chairman - Jorge. Martinez . ee José C.Agrelot = a Se FIELD TRIPS . _ Matthew C. Larsen, Chairman. , . POSTER SESSION . ; , Robert A. Renken Gregory L. Morris, Chairman co , , an SPOUSES EVENTS . LocaL ARRANGEMENTS. . Carmen M. Torrens, Chairperson | Ana V. Scinchez, Chairperson — Ana V. Sdnchez . - TECHNICAL PROGRAM J. Hari Krishna, Chairman / Surface Water Vicente Quifiones-Aponte, Chairman / Ground Water Fernando Gémez-Goémez, Chairman / Water Quality Gregory L. Morris, Chairman, Poster Session : - Nicolino Liberatore Ismael Pagan-Trinidad Allen L. Zack E. J. Wexler | UNESCO COORDINATOR _ : "Carlos Ferndndez-J. auregui _ -ROSTLAC, Montevideo, Uruguay “vii AMERICAN WATER RESOURCES ASSOCIATION ‘BOARD OF DIRECTORS EXECUTIVE COMMITTEE -President......s.essessecessseesseseeesees alana tuematisas ......Warren Viessman, Jr. President-Elect..........c.cccsscesseececsesecseneeeeees a ee Peter E. Black Vice President ............ sesshesaessatnssesssecnsseens sete David W. Moody Secretary .....ccccccsccssscccsscccsteccsscsecscessessseesssesenees vesseeceseeessaeeees Nancy Lopez "Treasurer .........sseee pavonenonenniibann rit narbeaeS0¥ies asezHaNEHEtes Kenneth J.Lanfear Director-at-Large .........000. lletisistsseseene Jeffrey T. Armbruster’ - Past President ........cccccccsssesesecscsesssseseseees seen erry R. Rogers 7 DIRECTORS Pacific Northwest............. eceanicomnenoens wesststeeeteeeeeegeee Charles D. Mosher Pacific Southwest ..............0. sessecsasecapecsucesueeueenseeseensess .Herbert B. Osborn Mountain ......cc.cceece seucesustvsnussescvateavevevensosoes ...Bruce P, Van Haveren | West North Central .....c.ccsssecsssssssssssessssessseeeees lasecs Kenneth N. Brooks’ West South Central ..........ccsssssescsessssecseeeneeceeeseess ..Donald D. Adrian © - Kast North Central 0.0.0... cee ese recamndieenesenndondi sees Rd Vladimir Novotny — East South Central............... secscesenssssasaeaceneasesccacess Ferdinand Quifiones Mid-Atlantic .......ccccccesessesseessesseesseeseseeneeees nae Stephan J.Nix Chesapeake ...........ccccccsessesecesesssesseesssscsssseessornesess .Jonathan P. Deason | South Atlantic....c.cccccccccsssssssessessecsesseesseens sefeereenesewanesennd ....Wade L. Nutter New England ......c.cccsscssscscscsssessssssssscesesees Vesvevssesesssseseesaves Milton Potash ~ STAFF Executive Director.............. Veceessavesecsasaceseasssescesees Kenneth D. Reid, CAE Meetings Manager uu... Lomi atsaommncesen wane ndidia ns S6E40§5 Michael C. Fink ‘Publications Manager ......ccssesccsesssssseesesseeseesee Charlene E. Young Membership Services Manager ....ecrrrereecrererrserions beveesenees Judah B. Flum mS Finance Manager .. ix CONVERSION FACTORS . To Convert ; To . acre-foot (acre-ft) oo " gubic metre (m3) ~ acre (acre) ir . hectare (ha). pound mass (Ibm). | | kilogram (kg) mile (mile) kilometer (km) | pound force per square inch (psi). kilopascal (kPa) -US.gallon(gal)) iter (LY inch (in.) * - — milimeter (mm) ) kilogram-force (kgf) newton (N) pound:force (Ibf) ~ newton (N) foot. ~ "meter Multiple By - 4.23x 103. 0.405 0.454 4.61 6.89 3.79 25.4 9.81 - 4.45 0.305 ASRS CR er ery v8)s- af 7 Ligh LORE op EE Tee Pop ET eee Fa ee a Ge QA Lage = ae okey 8 Bt eis APOE Sh eT > i} , TABLE OF CONTENTS WATER RESOURCES MANAGEMENT An International Programme for Environmentally Sound Hydrologic and Water Management Strategies in the Humid Tropics — John s. Gladwell and Michael Bornell..........sscvcssssecssssscrseseessscessens sesaeneeececenescsadeceeeesegeneeestees eererrenye | . Preferred Alternative Uses of Water Resources: Views of Environmental Aotivieted in the US. Virgin Islands . - a, - Dennis L. Soden: emucanensnsoneuaunoeauccenee wrasnedinnsrestidsiesi tt fas auavennaassavanmeaniacenenesananennsesninte peseessecseseseeseneeseensenenaes il - Ground-Water Managemant: Problems in the. North Central Coast of Puerto Rico — Sandra N, Salgado and Felix I. Aponte .ciwmmcnnennrenmer goaseseechayentdtcenst etssepetcaneemboergssersyemmonel Significance of Chemical Boundaries to Ground-Water Management of Coastal Aquifers . : - William Back Gnd Janet S, Herman....csssecsscsecsssssersersnserrenssecessenvenssssvescessosscnoessssessansnseesssarees errr t Davelbpiiet of an Aquifer Management Model: AQMANSD - Juan C. Puig, Hoursdlen I. Rolo‘n-Collazo, and Ismael Pagan Trinidad ............ aavensiaerinsedenncentevertaedd ; 1139 Wellhead Protection: Af Approach to Preservation of Public-Water Supplies" “= John. Malleck and Myriam. ALBINO Bc sccncscesscesboesemanecmnemnncexarsn cx econemnrurar ions sensessousnsensinaressdboaresnaved 49 . Conditions for Successful Trrigation Projects in Africa = Philippe W. Zghetb .ewrnrnnsnsoneninnsnsininnenninnsnnnreneinnnnsnannin senereueee6l Using Common Sense to Prevent Soil Erosion Hom Urban Development Areas - Rall E. Zapata Lopez......... vasuengoaeqansnoseapteacashabsenesodeuidbadbi s0uocesUves esses ees sn svesess stsavedaeasevasstencesveseeseslsordtecsatets 71 SURFACE WATER HYDROLOGY _An | ARMA Model for ‘Rainfall- Runoff With Applications = Yun-Sheng Yu and Wang Guang-Te ciscssssessessssnreessssunensesseesetssssnnnnnennannen sesssseeeeesseensees vessessecssesseseecieene BL Parameter Estimation in Conceptual Precipitation-Runoff Models With Emphasis on Error Analysis - Dorge Rivera-SantOs ......s.csscsssessesssecssssrsensssensensessseacsnsnseneessssasessnssesssnsesesoessssesensnensessosssnseasonnuseaenesnees eee: | Automatic Parameters Calibration Technique for Rainfall-Runoff Modelling . * oo Shiang-Kueen Hsu....... Sark CR ENERIRETOE NO EEROEO CORONER ORENMUARENANNY REE PDN stsssoreneessvenesosectsersenstecesssctereees LOL The Study and Application of Rainfall-Runoff Model for Karst Regions ; . 2 — Zhang Jianyun and Zhuang Yiling ....ecccccccccecsecreresssccssecsssassececscceseessssaieecesacsessesssecsecseseseessssesesseees see LL Rainfall-Soil Moisture Relations i in Landslide- Prone Areas of a Tropical Rain Forest, Puerto Rico - _ -— Matthew C. Larsen and Angel J. Torres- SANCHEZ oesversrsrrnseesssessereceesssvnsssecnteresrnsennteninseensnneents veeee 121 Hydrological Responses to Urbanization in Forested Lanana Creek Watershed, Nacogdoches, Texas ~ Mingteh Chang and Alexander K. Sayok sesssscsececscoscssusnseeeeseceececees srcesannecnctesenenmcencesy easigs Sxsasanamanamncs xyes LAD The Geographic Distribution of Drought on Two Caribbean Islands: Puerto Rico and St. Kitts 2 Gregory L. eal and Mali Micquer heumennnseerses Levsurvacissseiensestecners $d hiqcnnsnddcceessguqrasadysssxaunnndlss snineausunnORanass 141 '. Role: of Temperature for Drought Study ; . _ wt ee _ -. = Thaod. Chang .. aleeelaseeedeceesreneseseesess eancaustenanartnasoarencecasegrennesssansiscnsssasieiecesoeSSisenssssees are meeosl sascegvessesesy wee h5L xi. Approximative Tech: digques im the Operational Optimization of the Maha weli R Reservoir System i in: Sci Lanka . _— Fanos J. Boga rdi, M. DB. U. P Kularathna, and Ricardo Harboe... beseseees screen teaneenseane secs eens LOT Real-Time Oneration of a Multipurpose Reservoir During Typhoon Occurrence . “Janos J. Bogardi, Wen-Cheng Huang, and Ricardo | 2 (01 o1s) EEE setsetesoneanees deseeveseeeis wel TT Reservoir Fill ling Plans for Tropical Reservoirs — A Case Study | . _ James Vearil and James C. Miller............. Saeesaneesscesaceseuccessesensaeheneaace deneeeebssuaceevessaseceseseceeesengucssaseeeenereees 187 Effects of Hurricane Storm Flow on Transport of Woody Debris i ina Rain Forest Stream (Luquillo Experimental Forest, Puerto Rico) - Alan P. Covich and Todd A. Crowl sevettaninununtituiimeneusimtnaesmeisnanente 197 Estimation of Total Water Consumption of Selected Vegetable Crops in the Semiarid and Humid Regions of Puerto Rico . - Megh R. GOYAL ..eececseceessceeeeneeceeseseesssessessensnesessessssiesssanereesesees sesssenscssssnsesonssensaaecsesescnecensconenesesenernenesaneses 207 Economic and Engineering Considerations for Planning Medium Scale Irrigation Systems: A Study ' From Northeast Thailand 7 . ’ — Sam.H. Johnson lil and Sanguan Patamaiamkul sesesseennscesnseesessnessecassesssanscsnesaecsssssessessaseneedeapecanensees 217 Study and Recommendations on the San German Vaulted Brick Storm Sewer System ' Luis Pumarada- O'Neill and Miguel Cruz -Arocho sesessesesesnesesees etssaseeeleseneesesassenssensassees seeeeees sessesapeeeetene B27 Culvert Flow in Small Drainages i in Montane Tropical Forests: Observations From the Luquillo Experimental Forest of Puerto Rico - EN. SCONE w..ceecssccscsssscsseccsscsenees sesseesecnvecsneesnecnssecssieesensesseesseressess veseecessseeseacease acsesesesevssessceseccesceeeasene 140237 Regional Equations to Determine Peak Stream Discharges in the Santander + Region, Colombia - Luis E. Aramburo B. and German E. Gavilan L. remem DA, GROUND WATER HYDROLOGY Problems of Ground-Water Development ; in Small Volcanic Islands in the Eastern Caribbean | - Nicholas S. Robins, Adrian R. Lawrence, and Alan C. COEDS oetreenrererrrcresstcrrscrntrneernnernsesceses BOT A Ground-Water Supply Study for the Nigua River Basin in the Dominican Republic _ Mark D. Taylor, Richard C. Johnson, and Jose: Bred Goo esecsssteseccesecseeee sesssseeastensesssteensssnsesesesene 269 A Ground- ‘Water Pollution Risk Assessment for Public Water Supply Sources i in Barbados , -P. J Chilton, A. A. Vlugman, and S. S. D. FOSLET oesnerrvecrrseees seaseees se eceseensesesseesensecsscaseseeesensessees eae T9 Techniques for Appraisal of Ground-Water Resources on Atoll Islands: Case Studies from Micronesia — Stephen S. AMENONY woseseserecscsseeeceesscsssinsesesnesecesannnnnieeessessoueniteesnanieeernaeeetnaed seseeseeseceeseeeeseesenesaeees seeeeeee 91 Geophysical Mapping and Hydrogeologic Analysis of Fresh-Water Lenses at Big. Pine Key, Florida : ' Michael J. Wighiman, Mark T. Stewart, and H. L. Vacher ......... sotsesesenencesacsesesensesensasseaesesensesees seseeeeeses 301 Very Low Frequency Electromagnetics Mapping of a Freshwater Lens at Key West, Florida — James L. Labowski, Donald J. McKenzie, and Aaron L. Higer sessgeteveaeessscenterasesoseseansaeneeee seecseeeseeeenes 311 AI Shi: Hyc App - «Lab Aspe Grou : Appli i ACon 2 The In Fir ‘Chemi Water ¢ Baselin Pue Land De - { U.S. Arn (o£ ya Shape of Freshwater Lens in Small Carbonate Islands: Great Exuma vs. Bermuda and the Effect of Climate ~ Thomas N. Wallis and H. L. Vacher THE eee ret Hydrogeology and Tidal Analysis Along the Western North Coast of the Yucatan Peninsula, Mexico .— Andrew Reeve and Eugene C. Perry, TT seossesnsscnnssonssoneesseeesiesseesvessnessnssossnssnsssesesessessecscrasssserssrsenseseres ad Application of the Boundary Element Method to Some Problems i in Water Resources mo os Rajesh Srivastava and Dinshaw N. Contractor .......cssccssssseessesesssscssssessssessesecsseeseseesecsscectesesseveasseteerss 339 Laboratory Simulation of the Effects of Overburden Stress on : the Specific Storage of Shallow _ Artesian Aquifers os — Nicasio Sepulveda and Allen L. ZACK oeciovevsviviniueueunsvinentinsiesriavinsatinnissevieineieit petesegeeesnsees 349 Aspects of the Hydrogeology of the Northwest Region, Yucatan Peninsula, Mexico a nn ~ E. C. Perry, TD, ceccssncccsessecsecssensesecarsnnetscsaecanseceesseccenatenee sesseesaceaeeese seesccetsncatanceansencaseaceseneeceuaceseenens weseeeeges BOT - Ground Water Seepage in the Indian River Lagoon, Florida . CO - Thomas V. Belanger and Robert B. Walker .. sacceeesacseececnseaeenconens sessecsegeeseesccnsesseseeacuseesatencesnseseesceaseqees ee BOT ; Application of Ground-Water Artificial Recharge i ina Brackish/Saltwater Environment — Albert Muftiz, Sean Skehan, and Peter J. KWIGEROWSRL ..oeessssserssnsscsesteecsnsensnsecennennnnseeneecnseesias Seeseeetes 377 & < Artificial Ground-Water Recharge, Ventura + County, California oo : — Bryant R. ROS ......ecccsseseccssssscsssssenesenssensnesssssssenssssschesesesesesesesssenssusssehesesesesssescacnenenssesssseaescesesensaeseeslaceens 387 F nA Computer Program for GEOphysical Log Data MANagement and Plotting (GEOMAN) * -— Ileana E. Arroyo, Sigfredo Torres-Gonzalez, and Ramon A. Carrasquillo.....cccoeeccsesscesisesees geeaeeesnees 395 2 The Interactive Computer Program MODUMANAG, ‘AData Management Tool for the Modular - Finite-Difference Ground-Water Flow Model’ ' 3 - | Sigfredo Torres-Gonzdlez and Lourdes I. Rolon-Collaz0......s..ssseseseecseesseseesnenseessreenesrssnersesseesnes 408 Ye ‘WATER QUALITY _Chenmiea and Stable Isotopic Characteristics of Ground Water on Grand Cayman - Lo: S Kwok-Choi Ng and Brian TONES rrvseressoesserssennsniasnnsnnnseiannsnnininoessseeiite sesoveceveusceeccsssacsseneaeceasecs 41i ; “Water Quality of a Carbonate Island Karst Aquifer, San Salvador Island, Bahamas _ - . & — William Balcerzak, John Mylroie, and Gerald SS. PADSt Le .esecsecsssessscseseereseeeesneesseseeseseeseaesetecneenseneeneees 421. ‘ “Baseline Water-Quality Evaluation of Three Basins j in the Upper Rio Grande de Arecibo Basin, = Puerto Rico . ) . — Patrick William McKinley ......c.ccccscscececessscssssssssesccsssscsessvescsssesesenesessvesscsvscssaessassssessesesessasacseececies 433 "Land Development and Water Quality: The Cayman islands Study - , ee : _ ~ George E. Bowen and Timothy R. GENZOWGFE oo. eseeccscesesseteeses rests senesesesnesess soctveesaeeneeceseesenesecssesnesntensene 4d 4. S. . Army Land Condition/Trend Analysis of the Pohakuloa Training Area, Hawaii 2 - Robert B. Shaw, Christine M. Bern, Keith A. Schulz, Victor E. Diersing, and a = David J. TOZER oe eeseeseecsessessesssssessesseeseesussupesncesscsnecevecanseneensessesassssesuceauesecsnsesstecsaececeueceesacausseseesansutsncenenees 455. Siltation of Reservoirs i in Agricultural Watersheds Determined Using Raidoisotope Techniques ; James W. Naney. and Sherwood C. McIntyre. setusonscssacesscecsteeeee seelelessceees seseeeaees sqeeseessecesseaceaeeees vessesce 465 The Fate of Mevinphos Spill and Water Quality: A Case Study From Lakes Pen Municipal Dump Se = Peter Lamm.....: ssasaesevesescesscesseseoessesessesecnsnsesneessesesesessseesesseasnastasacasssatceseusensasesesasseasensseeeteessts sesteesesesenes 475 — Use of. Adsorbed and Non-Adsorbed Tracers to Study the Transport of Agricultural Chemicals to Shallow Groundwater - Rameshwar 8. Kanwar, Christopher J. Everts, and George F. ‘Czapar va scaesasebensssecccecceecscsesecssoeseeeeesees 485, Utilization of Intracellular Granules of INT-Formazan and Gene Probes for Tracing Microorganisms in Ground Water - Abdiel J. Alvarez, Sylvia I. Davila, and Gary A. TOFANZOS oosesecesesssesssssveccssvsssejssssesssssssssssssersesssee seseeees 495 Optimization. of Drinking Water Chlorination Practices for Minimization of Trihalomethanes Formation . — Concepcion N. Burgos, Jaime Benitez, and Lorenzo Saliceti. Soedaanseees desessesesees Veseeees sestessees seesseeeseesecesees 505, The Use of a Remote Operated Vehicle (ROV) to Evaluate Marine Discharges of Treated Wastewater — Robert J. Reimold, W. Kevin Scott, Maria Margarita Irizarry, Raul Gayd- Nigaglioni, and .. Stephen J. Cibik sesaesevsesescnceceess sessasesussssesssssausssuesssseneaveseaee sessussesssssseseesssssescsscsseassnsecacareesazacsceasatscscesecess 515 Management of Sludge From Puerto Rico’s Regional Industrial ‘Wastewater Treatment Plant: Phase 2-Dewatering - an - . Guido Pefia, Jaime Benitez, Abraham Rodriguez, and Rafael MUTOzsseresesseseessesersereenssssseserrions veaee 525 Removal of Giardia spp. by Conventional Water and Sewage Treatment Processes and Presence of Cysts in Surface Waters of Puerto Rico - - _ tvan E. Correa, Gladys M. Yumet, and Gary A. Toranzos........ sqeeseassenessesensesteapseseessseneesnessneenvees seceeetee OOO: Isolation of Bacteriophages From Large Volumes of Pristine Tropical Water and Their Correlation - to Fecal Contamination. ; Edwin A. Herndndez Delgado and Gary A. Toranzos senses stnssnattnneeseineneneteetne eeeeene sseseacennessee 43 Water er Quality Problems of Rural Communities in Puerto Rico: A Case Study - Roque A. Romdn-Seda, Ismael Pagdn-Trinidad, Robert Williams, Susan Shaw, and Torge Martinez ..ccccsessssssssssseessssessesssssssssssssssssassssesssssssesssneesssecasscsesecenseeniceseessesgeess sesveseesssesvees essesseeessseeeeeD BB Paper Tithe Index.........-.essecsssnsessesessneeneesneenecnecenseenee sesuecausecnssssuccssssscesaecesesuceucssesecsissactaceassaeeneeanecneesesssenecs 567-568 Author Index . secenceenseeesesesseeensceusesscessesesesssaseessuens Lessensessessesscseveccenscseceseescossceucoseeseesaressensne® steennntesecnannasesensssees .569- 570 xiv