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<br />N <br />o <br />-...J <br />1'\:' <br /> <br />SUPPLE:IE IT n TilE DPJ,FT E':':I~,,'!'!E'IT,\L 'iTr,TE'lEIT <br /> <br />lilT DES 71-39, .~.pril 1, 1971 <br /> <br />COLClR,IDr] RIVEr I:!TED.'!.\T1,)!f'.L 5'.Ll!!lTY C'rITR(iL PR::lJECT <br /> <br />Tel Pr\Q'IInE FlR ?r.rnECTlVE ;'.:J ~[r;i)L:\T')f>Y GR'IUTl 'i,'.TEe. PU;~PI::G <br /> <br />I. DESCRIPTIT: QF ~IE ppnp~S[D ~RQJECT <br /> <br />,~. Introduction <br /> <br />Extens i ve i nves ti 'lati ons of the 'leo logy and 'lround-~/ater Ilydro 1 O'1y <br /> <br />of the Yuma area have been conducted by the U. S. Geological Survey, the <br /> <br />United States Section of the International Boundary and i'Iater Comission, <br /> <br />and the Bureau of Reclanation. These investi'lations indicate that about <br /> <br />1.5 million acre-feet of ground water have accumulated to form a 'lround- <br /> <br />l'later storage round underlyinn the YUl'la !1esa as a result of nercolatinq <br />l'laters fro"l irrigation of mesa lands. This quantity of 'lround l'later is <br />in addition to a much larger quantity of ground \'Iater in storage under <br /> <br />the Yuma area. The qround-\'Iater reservoi r underlyi n1 the YUl'la area is <br /> <br />hydraulically connected to the ground-water reservoir underlyinn lands <br /> <br />in :'lexico to the south of the International 30undary separatinn .\rizona <br /> <br />and Sonora, !'1exico, and to the 'lest of the Colorado River separatinq <br /> <br />Arizona from Gaja California, '1exico. In qross aSlJect, the 'lround- <br /> <br />water reservoir extends over an area of ap[JroxiC1ately 2,30') sq'Jare <br /> <br />miles, about one-third in the United States and two-thirds in I~xico. <br />