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<br />-.~O*-7 <br />:J":'IJ't <br /> <br />00 <br /> <br />A large portion of the surface flows which CRuse the arens of free <br />wuter surface undo saturated soils would be. carried from the ponding <br />nrcas to the IIlUIIl COIlYCYUllce channel In small surface ditches. <br />Draining off the ponded floodtlows wouhl reduce the nrCll of free water <br />surface from about 2,400 acres to about 1,000 acres, includiwr San <br />Luis Lake. The utll1unl net evnpofntion rate averages about 3.5 feet <br />and the water slllv8U'c resulting from the 1,400-acre reduction in free <br />water surface would be about 5,000 acre-feet per year from the salvage <br />area. <br />The evaporation from the snturuted soil urea would uxerage about <br />2.3 feet per ,ycar with 11 depth to g:round water of about 1 (oot. Lower- <br />ing the water table u minimum of 2 feet would reduce the annual soil <br />evuporution rate to about 1.3 feet. This minimum lowering of the <br />water table would result ill wuter snlvage of nbout 3/600 uere-feet per <br />year from the snlvnge oren, <br /> <br />Quality oj water <br /> <br />Snmpling prior to the fensibility investigation showed the wuler of <br />the natuml streams nnd the diversions from the H.io Grunde to be of <br />good quality/ hnving both low sodium find slllinity huzurds, Dissolved <br />solids in the flow of nuturnl streams discharging into the Closed Bnsin <br />range from 60 to 197 parts per million_ In t.he wuter di\'erled frum the <br />Rio Grande, dissolved solids generally runge from about 30 to 60 <br />parts per million, with the percent sodium being less thun 36 percent. <br />In the nrea irrigated by diversions from the l{io Gnmde, dissolved <br />solids in the drain water ranged frum uhollt 50 to nbout 350 purts per <br />million, with the percent sodium mnging from ubout 2 to 53 percent. <br />The quality of the slwllow, unconfined ground wuter varies widely_ <br />Along the perimeter of the floor of the Closed Basin where ground <br />\nIter is rechllrged from natural streurnflow llnd surface irrigation the <br />ground wuter has 11 quulity ~imilnr to that of the surfllce water, The <br />quality deteriorates us the ground wnter moves into the sump area of <br />the Closed Basin south of Sun L,uis Luke lllld west of the sulnlge <br />ureu, where the dissoh-ed f'olids Uyefllge ubout 3,000 purts per million <br />and the percent sodium u\-ernges about 70, <br />Additionnl sampling was accomplished during the fensibility in- <br />vestigation to determine the qunlity of the overflow from Russell <br />Lukes, the dmin flow nnd operntion wuste from bmtls irrigated hy <br />di\'ersioIls from the Rio Grande! untl the flows of Big dnd Little <br />Spring Creeks, The uvertlge concentrations of (li~::;olvetl solids \\-ere <br />found to be as presented in bIble 7. <br /> <br />T.\BLE i,-Summary 0/ average concen(rations 0/ dissolved solids of surface flows <br /> <br />Con<<mratiQn <br />ofdiuolud <br />,olidl i~ <br />porn ptT <br />Drain outflow and operation W3Stl': mil/Kill <br />From Center aretL _ _ _ _ _ _ _ _ ___ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ ___ _ _ _ _ _ _ _ _ _ _ 300 <br />From :\loscn.-lIoopN fl.r('n.____ _______ ________ _ __ _____ 250 <br />Hig Spring Crcek__________ _ _____ ______ ____________ ______ 170 <br />Little Spring CrceL______ _ _____ ___________ ____________ 160 <br /> <br />~our('e of flow: <br />