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<br />W in salinity levels occur, the agriculture in the Imperial, Coachella, <br />N <br />....J Gila, and Yuma Valleys would be further threatened. Also, a poorer <br />..~ <br /> <br />water quality would be diverted to the Metropolitan Water District <br /> <br />of Southern California and the Las Vegas Valley Water District, caus- <br /> <br />ing further economic losses to the very large block of domestic water <br /> <br />users in California and Nevada. Upon completion of the Central Arizona <br /> <br />Project, water users in the Phoenix and Tucson areas would be similarly <br /> <br />affected. <br /> <br />The Proposed Solution <br /> <br />General Approach and Authority <br /> <br />A comprehensive la-year Water Quality Improvement Program has been <br />structured and integrated with programs involving weather modifi- <br /> <br />cation, geothermal resources, desalting, and the Western U.S. Water <br /> <br />Plan. These programs, when implemented, could maintain salinity in <br /> <br />the lower main stem at or below present levels. <br /> <br />The Water Quality Improvement Program has an investigation and an <br /> <br />implementation phase. The authority for the investigation is derived <br /> <br />from Public Laws 84-485, 87-483, and 87-590 relating to the Colorado <br /> <br />River Storage Project and Participating Projects, Navajo Indian <br />Irrigation Project and San Juan-Chama Project Act, and the Fryingpan- <br />Arkansas Project Act, respectively. <br /> <br />ix <br /> <br />