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<br /> <br />W <br />N <br /> <br />.~ <br />~ <br /> <br />-.J <br /> <br /> <br />II PR~VIOUS STUOIES ~'D FINOINGS <br /> <br />The program for controlling salinity in the Colorado River has <br /> <br />evolved from prior studies. Those of most relevance to the pro- <br /> <br />gram were perforoed by the U.S. Geological Survey. Bureau of <br /> <br />Reclamation. Environmental Protection Agency (and its predecessor <br /> <br />agencies), Water Resources Council. Colorado River Board of <br /> <br />California. and Utah State University. <br /> <br />The USGS studies were of the definition type. They trace historic <br /> <br />salinity levels. estimate salt loading from specific sources, and <br /> <br />identify salt contribution from various river reaches. The Bureau <br /> <br />of Reclamation studies report on the past, prescnt nodified. and <br /> <br />future water quali ty condi tians in the basin. The effects of salin- <br /> <br />ity on water uses and potentials for salinity control are discussed. <br /> <br />The EPA study describes salinity conditions in the basin. evaluates <br /> <br />the nature and magnitude of damages to water users, examines alterna_ <br /> <br />tive salinity control measures, and provides reconnended measures and <br /> <br />programs for control of the salinity levels. The Colorado River Board <br /> <br />of California also defined the nature and l'las:ni tude of the problem <br /> <br />and presented a plan for controllins: the salinity at or near present <br /> <br />levels. The Water r.esources Council Task Forces drew heavily on the <br /> <br />prior studies and developed csti~ates of futuTe salinity conditions <br /> <br />and identified potential control rlCaSllTCS, IItah State University <br /> <br /> <br />12 <br />