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<br /> <br />~ <br />~ <br />o <br />"', <br /> <br /> <br />Lower Colorado HeRion Comprehensive Framework Study (WRC) <br /> <br />The report by the "ater "esources Council dated June 1971 states <br /> <br />that hieh levels of dissolved mineral salts in surface and ground <br /> <br />Haters are the- l'1ajor water quality prohlen in the region. h'ith <br /> <br />few exceptions, most surface and ground-water supplies have mineral <br /> <br />concentrations exceeding 500 mgll, and many exceed I,ODD mg/l. n,e <br /> <br />salini ty of the supplies affects domestic, industrial, and ar.ricul_ <br /> <br />tUTal uses. <br /> <br />The Colorado River enters the rer.ion at concentrations exceeding <br /> <br />5DD oelI, varies between 500 and 90D ne/l at most diversion peints, <br /> <br />~nd increases to as high as 1,100 to 1,150 og/l for short periods <br /> <br />of time at Imperial Da~. Salinity increases in the Colorado River <br /> <br />from Lees Ferry, AriZona, to Imperial Dao arc due principal Iv to <br /> <br />inputs from saline springs and the concentrating effects of Con_ <br /> <br />Sllmptive Use and reservoir evaporation. <br /> <br />Oissolved solids concentrations in the Colorado Itiver are estimated <br /> <br />to increase about 55 to 75 percent between 1965 and ~O~O, with the <br /> <br />exception of IJ'1perial flam "'here the concentration is estiMated to <br /> <br />double. These results are based on the assumptions that the Central <br /> <br />Arizona Project is in operation and no salinit)' controls are incor_ <br /> <br />pOTated in future developments <br /> <br />~O <br /> <br /> <br />