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<br />Headgate Rock DlIlII, located about 15 miles dowustrelllll !'rom <br /> <br /> <br />Parker Dam, is the diversion structure through which the Colorado <br /> <br /> <br />River Indian Reservation receives its irrigation water. This <br /> <br /> <br />structure maintains a constant pool elevation by means of auto- <br /> <br /> <br />matically operated river gates. <br /> <br /> <br />Palo Verde Diversion DlIlII, located about 58 miles downstrelllll <br /> <br /> <br />from Parker DlIlII, is the diversion structure for the Palo Verde <br /> <br /> <br />Irrigation District. This dlllll is also operated to maintain a con- <br /> <br /> <br />stant pool eJ.evation by automatica.lJ.y operated river gates. <br /> <br /> <br />Between Parker and !Dqlerial DBIIlS the river flows through vide <br /> <br /> <br />vaJ.leys for about two-thirds of the total distance of about 150 <br /> <br /> <br />miles. It is in this reach of river that the J.ands of the <br /> <br /> <br />Colorado River Indian Reservation, the Palo Verde Irrigation <br /> <br /> <br />District, and the Cibola Va.lJ.ey are J.ocated. This reach of river <br /> <br /> <br />uso receives waste and drainage waters from the Indian Reservation <br /> <br /> <br />and Palo Verde Irrigation District. ReguJ.atorywaste from these <br /> <br /> <br />districts returns through a few major and numerous smaJ.J. wastew~s. <br /> <br /> <br />On the Indian Reservation there are two major draiIl88e return <br /> <br /> <br />channeJ.s llhich discharge into the river. The outfa.lJ. drain at <br /> <br /> <br />the lover end of the Palo Verde Irrigation District returns the <br /> <br /> <br />major portion of the drainage vater from that district to the <br /> <br /> <br />river. <br /> <br /> <br />!Dqlerial DlIlII, located some 150 miles downstrelllll frOlll Parker <br />DlIlII, is the major diversion structure to irrigation projects in <br />the Imperial Va.lJ.ey and Yuma areas. It diverts vater on the <br />right bank to the All-American Canal llhich deJ.ivers water to the <br />Yuma Project in Arizona and California, and Ilz!perial and Coaebella <br /> <br />, <br /> <br />.' <br /> <br />20 <br />