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<br />16 <br /> <br />EXISTING PUHPING REGHtENS <br /> <br />For this analysis, there are two pumping regimens in <br /> <br />operation (February 1973) which are withdrawing groundwater from <br /> <br />the Colorado delta aquifer; one in United States and another in <br /> <br />Sonora, Nexico. <br /> <br />12 Yuma r~esa Ivells (60,000 AF/yr) <br /> <br />These viel1s, located along the western side of Yuma Hesa, <br /> <br />Arizona, were placed in operation July 14, 1972. The approxi- <br /> <br />mate rate of pumpage is 60,000 AF/yr (acre-feet per year) and <br /> <br />the water is conveyed via a buried lined drain into the Colorado <br /> <br />River above Morelos Dam. <br /> <br />The singular effect after 10 years of pumping from the 12 <br /> <br />Yuma Hesa wells is sho~'m by the computed change of water levels <br /> <br />on Figure B-2. On Table 1 the quantitative effects are given for <br /> <br />5, 10, and 50 years of pumping. A recapitulation of effects at <br /> <br />the end of 50 years of pumping follovls: <br /> <br />a) Reduction and recharge from Colorado River would be <br />8,800 AF/yr (50 year average); <br /> <br />b) Depletion of surface drainage flows at S.I.B. would be <br />36,200 AF/yr (50 year average); <br /> <br />c) Depletion of groundwater storage in United States would <br />be 490,000 AF at the end of 50 years; <br /> <br />d) Depletion of groundwater storage in ~lexico would be <br />285,000 AF at the end of 50 years or about 9 percent; <br /> <br />e) The change in rate of ground,vater flm'l across the <br />Arizona-Sonora boundary at the end of 50 years would <br />be -5,300 AF/yr and the total flow across the boundary <br />to Mexico would be reduced to about 40.000 AF/yr. <br /> <br />i <br />I <br />! <br />I <br />I <br />I <br /> <br />I <br />