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POTENTIOMETRIC SURFACE OF THE KINGSHILL AQUIFER AND HYDROLOGIC CONDITIONS DEPARTMENT OF THE INTERIOR U.S. GEOLOGICAL SURVEY CARIBBEAN ISLANDS REGIONAL AQUIFER SYSTEM ANALYSIS _ GEOLOGICAL SURVEY WATER RESOURCES DIVISION WATER RESOURCES INVESTIGATION REPORT 89-4085 ST. CROIX, U.S. VIRGIN ISLANDS, JULY 1987 E UNITED STATES GEOLOGICAL SURVEY WATER-RESOURCES INVESTIGATIONS REPORT 89-4085 aes —*\ ‘ “10 William ’ \ \ | ‘ 4 See f 3 as ‘A 4 Fort Fredenck US NAVAL | ~ y Lighha RESERVATION A 8 Frederiksted "Wheel of Fortune A ~")Water® —— 4 Hosgnit ‘ha ae i a oe . 3 i ‘ ~ ; ' Whites = 10 ~~ Con cordia ~Ruivs ) ‘ U.S. GEOLOGICAL SURVEY WATER RESOURCES DIVISION Hydrologic conditions prevailing within the island have changed since they were last addressed in the mid 1960's (Jordan, 1975). Between 1963 and 1967 the average departure of the mean annual precipitation from the long term normal was -4.69 in (inches), indicative of relatively dry years. For the period of record, 1983 to 1987 this average departure was only -1.41 in, indicating that the annual average precipitation for the period was closer to the average long term normal of 42 in. Other significant changes i¢ < cHogensbore o oO rt aa F hs SaReins t Ssh Ge eel , Ruan ro ods ~ \e. ~ \ a ~ < P b, + ; "ti J Hope and. a ae Carlton Land =< m 3 KX Upper Love 4 ° 1 Holy Cros} Me Pienyint~ Sallys Fancy St Josephs Ch ty wr a / os | Looper © aw 9 @. Ruins Bettys Hope —— Alexander Hamilton ye eqw 5, 5 se <> ROT -Envy °(10)-— Kr. : Golde : | rs oo bebe Prd Cw > ohn Water hes ee Molasses je } ats ay Bethlehem Olt Wor as i’ \e z" o-ring > asin 28 800, 000 Alexande Airport Manning Bey Racetrack a A ° vt i Sepa ” Statiog Lia ge ee amuton « Ae v aed Annaberg \ ot a Zn Je: i f was A ‘be “ > AQruilla A é i Py Fie re. « ad co eB CARIBBEAN SEA \ ‘a7 Ia Reine LOA -y ‘Spanish wR ~ NATIONAL HISTSHIC. | 202 1 oe 1 = EK Ww. = SP ea TR aC oar * or.’ —_ wh ™ (EAST POINT) 203 04 50'30"" 05 06 1 Q€C 000 FEET 08 9 48" 2 goog 1 4 13 45°30" = yg 15 16 317 43° 319 "20 sg / ! | 18’ 65°00" 45’ es*s0° EXPLANATION is 5005) MAJOR WELL FIELDS - WATER CONSERVATION POND - O » AFFECTED AREA BY PUMPING WELL — POTENTIOMETRIC SURFACE OF THE KINGS HILL AQUIFER Sel einai aioe vanwnw ecb wunlicide Pond containing water at time of ccd! temas oniuheor potartonets are located. The number represents the hydrologic reconnaissance. surface was affected by pumpage from AND HYDROLOGIC CONDITIONS IN SAINT CROIX, U.S. VIRGIN ,.- 30: 7 sina panes OB 780) y moe ISLAN DS, JULY 1987 eo Contes! LP 9 f reed gett OS caine —— apne SERVICE AREAS baaaareoriermeiinractnan nye: 2M fe) Well used for public-water supply. S St.Thomas Sea x 4 ; (0) Well used for industrial-water supply. . ae : Pa SY \ e es =z t Sarge insane Tho ae e@ Well used for domestic-water "67 By Sigfredo Torres-Gonzalez and Felix Rodriguez del Rio re Ie ow? ED) is, se te snk apaaeeaneer we oun: iidamiags ameaiiont jomestic-water supply a =e 2 \ ¢ a ny ~y : % desalination plants at Christiansted. 4 measurement. — Well battery. A ground-water level survey and reconnaissance of the are: ground-water withdrawals in the south-central part of / @ Pat Aj kh 7 Om POTENTIOMETRIC CONTOUR - Indicates water level was recovering after e a — hydrologic conditions in central Saint Croix were performed —_ the aquifer area increased from less than 50,000 gallons per / /, eb oo ea ees R_ pumping was discontinued, while water _ during July 1987. This synoptic survey was accomplished day to about 0.5 million gallons per day, and the dredging of 15° Wobiera 7 oa 15’ - Spay 25) “| Dashed where approximately located. pi seats a i. pf Abandoned well. as part of the Caribbean Island-Regional Aquifer System Krause Lagoon for construction of port facilities. Both St.Thomas, bg ree es “St.John Salt River 7) NT ee clad € —_ water-level measurement made in ® Test hove. ae fragen —— nine — a ey Sea 0 eitersnas' i ie: peterinanc Bay “at JL -—L AREA WHERE ihn aon he ' vin collected at well Dry well, (entire thickness of Kingshill shown on this map will be used in calibration of a digi surface which is as much as 5 feet lower within the Fancy “i w caning eg tg eipuiatia ap engi Sraarabe tae Sisk Gel Sines Ae Ee sesthesene abt em acter | —— . sen obtained to define the hydrogeologic framework and VIRGIN}ISLANDS little or no water. instantaneous well discharge in gallons > —_—— aM 65 hydrochemistry of St. Croix. This map covers the island’s Additional information is available at the U.S. PAs BOUNDARY OF AQUIFER - (ye per minute; lower number Is total dally principal ground-water system, the Kingshill aquifer, and Geological Survey, Water Resources Division, GPO Box 18°00’ eal fil eatew one — i parent vhraichacmmetcodle » areas nearby. The potentiometric surface was delineated on 4424, San Juan, Puerto Rico, 00936, telephone (809) unconsolidated sediments, and are estimates. the basis of measurements at existing wells and several test 749-4346. QUADRANGLES ap Here: holes which were constructed at sites where lithologic and SHOWN - borehole geophysical data were obtained. The altitude of References } the potentiometric surface was referenced to mean sea level ; | t datum from the topographic map at 1:24,000 scale. The Geraghty & Miller, Inc., 1983, Report on current pS _ map illustrates existing conditions of the potentiometric ground-water conditions in the U.S. Virgin Islands: 17°45" 17°45" ) i _ surface altitude, the location of most major production wells 80 p. a a 1965, 4 and their estimated discharge, and _ sites where he ground-water quality samples for common constituents and = Gémez-Gémez, Fernando, 1987, Planning report for the Piedcriketed | Cirletianctoe 8 af ) c: stable isotopes of water were collected. Instantaneous Caribbean Islands Regional Aquifer-System analysis Muditygffier ys s discharge at pumping wells was obtained from actual project: U.S. Geological Survey Water-Resources 15° 65°00’ 45° 64°30" sant measurements, on-line flow meters, or from well owners. Investigation Report 86-4074, 50 p. ice - S The discharge at public water supply well batteries was [ye . at ie. R estimated only for daily withdrawal. These estimates are Jordan, D.G., 1975, A survey of the water resources of St. . aS ale based on actual discharge measurements at various wells Croix, Virgin Islands: U.S. Geological Survey B bn + Sina OO eenncinmnal and from previous reports (Geraghty and Miller, 1983). Open-File Report 73-137, 51 p. 2B ~- ; sa." -nor~ ae eeeaeemene SO a Roun ao =a San 8 a a ws mat eo ees Fa 2 ™ Se bl The map also shows two important hydrologic hey) he A ASS | features: conservation ponds and areas served by the 57 " af db 4 oe reas) CHRISTIANSTED HARBO < public water-supply system from the seawater desalination as i { Rattan and Pelvedere * ee ~ . plant at Christiansted. Definition of the latter is locally aN "of on AN ‘ 700" | = important since, in general, urban areas outside of F fine, a md <—Ww oe P m=: % Christiansted and Frederiksted dispose of sewage through I> Th, i CBr : brotastane 7 ~ 2 septic tanks. Areally this source of recharge could be of ae : sda © 4 be _ significance given the tropical dry climate. rae A é ot = cuxisriasteap Gallows Bay. > fv 5 { [ 7 is uF sees “Sarionst, Higp_ORIC SITE om, ghirstan ~ a | — @ Feta “Ke mr P . 8 uo ou 5 & 1627 INE ~1 1 \ Gorn Bin CARIBBEAN DISTRICT SAN JUAN, PUERTO RICO 60 | * Ble ssing q* A ti a \ ra Cassava ne vi i \ed j ge aS a NS ¥ iN Garden, Vy a , a e si fx Me =. Raing\ Be eh an -Granard’ ; : 2 — —/ Res mag oe i \ Lerusatom and 4 \ s ae af = Mo # 5 . ee apg ‘fel yee } , . a . 1 = se va ed € g0 ¢ \ d Pf : 2) 2 ¥o 20 = a e , < “MULTIPLE WELLS. WITHIN DASHEDeAREA , i: ae SB : rs . +3 “ “~*, eo--* ESTIMATED PHARGE 150,000 888 per fey Weer A = SEES ee. ae S ‘ ry \ ‘. Bae a \ s @ oY ~ A 0.3 OF. : 3 a 4 \ is { | Ov: Vs 3 Mond " : 3 \ i \\e ; ay =4 Bo e—\) hel, ° \ ¥ - Keturah . : ® : 4 - ~~ * . a a J ° , Manchentl & “a < \ Bay | 3 F es @ ne she | \A~ é ‘ ' ; i” &? a ua ei fem Wy Ne % a fe hos =, = = ho oer ens a i Se —a : — — =i ‘. 1958 * + Lave* ] et ie ore - , Kay ¥ - t PGs £ ~ a ae th wi SCALE 1:24000 ve Lee 5 - 4 0 1 MILE : 1000 0) 1000 2000 3000 4000 5000 6000 7000 FEET c eS Soa 4 =I =j a a 1 5 0 1 KILOMETER ce aS ee 5} S ~ 1 ot —- ~ —: —— — ( el ee —a = SS —— ms a — a 8 LL ns oO ° < LS 2 e | % ~ Prrtinerceree erin | + + 7 i, S af a | + + é os, @ “Sy ewer i Way ro Sg oe | | a 3 wn etn = .