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<br />18 <br /> <br />12 Yuma Mesa Hells (60,000 AF/yr) and <br />Sonora Hesa \1ells (160,000 AF/vr) <br /> <br />",- <br /> <br />...... <br />.:". . <br /> <br />Thc singular effect for the combination of both pumping, <br />regimens in United States and Mexico was determined to provide <br />an assessment of the responses on the ground1...ater system. The <br />computed "ater level change after 10 years of pumping is sh01m <br />on Figure B-5. The quantitative effects after 5, 10, and 50 years <br />of pumping are given in Table 1. A recapitulation of the effects <br />at the end of 50 ,years follows. <br /> <br />a) Reduction and recharge from Colorado River would be <br />20,600 AF/yr (50-year average); , <br /> <br />, <br />I <br />I <br />, , <br /> <br />~ <br /> <br />\ <br /> <br />I -- <br />, <br /> <br />b} Depletion of surface drain~ge flow at S.~B. would be <br />53,000 AF/yr (50-year average); <br /> <br />c) Depletion of groundwater storage in United States would <br /> be 1,750,000 AF at the end of 50 years; <br />d) 'Depletion of ground1,ater storage in Hexico would be <br /> 4,600,000 AF at the end of 50 years; <br /> <br />e) The change in the rate of groundwater flow across the' <br />Arizona-Sonora boundary to Mexico at the end of 50 years <br />would eomprise an'increase of 45,000 Ar/yr and the total <br />flow across this boundary would be about 90,000 AF/yr. <br /> <br />The computed '-'Liter level change at the end of 10 yea).'s for <br />this pumping regimen was subtracted from the 1972 water level <br />contours as sh01m on Figure A-II. The result of this analysis <br />is sholYII on Figure B-6 which compriscs a prediction, of the <br />actual "ater level contours 10 years after pumping from both the <br />12 Ymna Mesa wells and the Sonora Mesa wells. An inspection of <br />the grauicnt'reveals that it has becn steepened (nearly <br />doubled) at the Arizona-Sono).'a boundary. It has been cstimated <br />that the total flO\, across the boundary to Hexico would be <br />about 60,000 AF/yr at thc'end of 10 yeurs of pumping. <br />