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<br />GGG17~ <br /> <br />62 <br /> <br />lands in the ~Ios('a-Hool)t'r area. By furnishing' 11 reguluh'd irrigtttion <br />supply to the Hio Grnn( e di,'isiun lunds, the 'Vllgun \Vheel Gap Res- <br />ervoir would t(\(1IJ 1.0 stabilir.c the llIllllltlI inflow into tlw Clos('d Ru.sin <br />Sl1lnp area from those lands. It contcmplat.ed 1.ll8.t, should tile propos(.d <br />experirnentul deep \\"cll pump insttdlution result in ~utisfll('tury salvtlge <br />of ground \\'uters for irrigution liSt', udditionnl PUIIlJl units CUptlblp of <br />salvuging a lotnl of about 30,000 ll<.'rt~-fl'et Illlnuallv for Ilse in tilt' <br />~loscu-Hooper ar(>ll would be installed. This would ilicn'llse the watf'f <br />supplies uvuilnhle to Hio Gmnd{' divisiolllauds. It probllblv would not <br />fuwc uny significant effect on the inflows into the Closed Bll~in sump <br />ureR, ns the consumptive u~e requirements of the vegt'tatiuIl cov('ring <br />the urea between the irrigated lands and tlit. sump ure of such mHgni- <br />tude us to essentiully eOllsurne the ground-water outflow from tilt' <br />irrigated lunds and thereby minimize tIlt' nmollnt of ground waters <br />tllllt reach the sump from the irriguted lands. <br /> <br />U.S. Geological Survey Waler Supply Paper No. 1379 (1958) <br /> <br />This report sllmIJlarizt's the ground-wllt-l'r investiy(J'utions nccom- <br />plished by the Gl'ological SUT\'ey in the Sltn Luis V f\ ley during the <br />period 1946--53 under a cooperntin' a~f('l'mcllt with tll(' Bureau of <br />Reclamation and the State of Colorado. together with the findings <br />based thereon. It indudt~s tin inflow-outflow study mude of the main <br />farming urea west of the Closed Bllsin sump. It ul50 includes estimates <br />of the trallsmissibilities of the shllllow ground-wuter uquifers, the ratf' <br />of ground-water movement, unci the probable quantity Hnd qllalit)-, <br />of ground wuter thfit would be intE'rceptNi by the drnin through till' <br />sump of th(~ Clospd Basin proposed in HOllse Document 69:3. It n.lso <br />summarized tl1(' general ground-water characteristics of the \.allev <br />find the Closed Basin und presents water tnble contour maps, wfllI <br />location maps, cross sections of the study ar('u bused on tp~t drilling, <br />n reconnuissnnce map of the piezometric surfnce, hydrognlphs of water <br />le\'el fluctuations, records of pumpng:l' of wllter from shuIlow irrigation <br />wells, records of discharge from nrt-esiun wells, tabulated records of <br />2,162 wells Hnd 1,079 chemicfilllllllly~('s of ground unci surface waters <br />und locations of 291 tcst holes, wells, and oil tests, ~lost of the sampling <br />of the groundwater body by the Geologiclll Sl1rn~y wns limited to th(' <br />uppermost portion, so only limited dutll un' presellted us to quulity of <br />the ground Wtit-er at different depths. The report I'l~vellls, m1l0ng other <br />things, that: <br />1_ The shnllow ground watl'r tlUll \\"ould be inter('t'ptNI by thl' <br />sump drain would fnil to IlIPt't Rio Grandf' ('ompa<'l requirenH'llts <br />unless it ('ould be diluted with a Illll('h larger tlmollnt of bpUer qUlllity <br />of surffic(' \\"ut,'r. <br />2. The 1Ise of deep artt'sian \Vt'lIs by irrigntor~ uPlwurs to hun' <br />relatin'ly little etf('ct upon t.hl' supply of \\.il.ler in the shallow confinNI <br />and unconflned nquiff'rs a.s the ('ontillill~ Inyers of ('Iny nppenr to be <br />thit'kf'f ulld more pxtpllsi\-e with llppth. The r('{'hnrge to tIlt' dcep <br />nquifers probnbly is r('~trieted to llrf'tlS lwyond tll(' prt'st'nt limits of <br />dc\"elopmellt of shallow ground \\"fitf>r for irrigation, <br />3. ,ruter in tilt' shallow artesian uquiff'rs mon's frolll the ~idps of <br />tlH' Closed Basin toward the sump aft'H, \\"11('1'(' much of it moves <br />upward t hrollgh lellky !lull lenticular confining- Itlyers nnd i~ f'\"entunlly <br />lost through f'\"tlporntion and trall~piration: th(' rt'Ulllilhlrr mo\'es <br />soutln\"llnl !1IHI di~('hllr!!l's into tht' Hin Gl'tmdl'. ',"at('r ill th(' artesiall <br />