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<br />. <br /> <br />. <br /> <br />~ <br />o <br />Ul <br />(J1 <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />because of pollutants added upstream. <br /> <br />The Irrigation Response Problem. The Bureau of Reclamation's <br /> <br />Colorado River Basin Water Quality Improvement Program points up <br /> <br />the magnitude of the irrigation response problem in improving the qual- <br /> <br />ity of water in the Colorado River, under a policy of maintaining 1972 <br /> <br />quality levels while providing for agricultural and industrial develop- <br /> <br />ment in the basin. Implementation of this program under PL 93-320 <br /> <br />authorizes construction of the Paradox Valley, Grand Valley, Crystal <br /> <br />Geyser, and Las Vegas Wash salinity control units. Completion of <br /> <br />planning reports on other point, diffuse, and irrigation units is author- <br /> <br />ized. Irrigation source control areas include the Lower Gunnison, <br /> <br />Uintah Basin, Colorado River Indian Reservation, and Palo Verde 11'- <br /> <br />rigation District. <br /> <br />PL 92-500 will be a major element in future discussions concern- <br /> <br />ing the Bureau's proposal to develop about 440,000 acres of new irriga- <br /> <br />ted land and to deplete an additional 2.2 million acre feet by the year <br /> <br />2000. A summary of point, diffuse, and irrigation sources included in <br /> <br />the Act and Program emphasizes the importance of agricultural respon- <br /> <br />ses to salinity in the basin. <br /> <br />Point source control projects. The characteristics of these pro- <br /> <br />jects, all above Hoover Dam, are shown in Table VII-2. Blue Springs <br /> <br />in Little Colorado, Arizona, is a major source of salt. The study did <br /> <br />not recommend a program there because (1) the springs are a source <br /> <br />l7 <br />