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<br />~ <br /> <br />w <br />l\) <br />C) <br />f'...... <br /> <br />1975 to $34 an acre-foot in 2015. The study was supported by a 6-week <br />ion exchange pilot plant on the Colorado River below Davis Dam. The <br />5,QOO-gpd plant successfully reduced 750-ppm water to 500-ppm product <br />water. Because of other foreseeable problems of very large scale ion <br />exchange plants, future studies will concentrate on smaller installations <br />having volumes similar to the present maJor diversions. <br /> <br />No study of other processes is programmed this year, however. these <br />studies are scheduled to resume in FY 1975. <br /> <br />Economic Evaluation of Water Quality <br /> <br />A study is under way to quantify the impact of increased salinity on the <br />multiple river uses. A report is being prepared which will show the <br />preliminary findings of the study group as to the negative dollar impact <br />for each unit increase in dissolved solids concentration in the river. <br />These results will be essential in evaluating other features of the <br />CRWQI P . <br /> <br />Institutional and Leqal Review <br /> <br />An institutional and legal review of Federal law, state laws, power and <br />water contracts. an international treaty, and a U.S. Supreme Court <br />decree has been completed and a report of the findings is being prepared. <br />This analysis will identify the constraints on the program and establish <br />a legal framework from which the salinity control measures can be pur- <br />sued. <br /> <br />Systems Operations Studies <br /> <br />Investigations will be initiated this year to determine if existing <br />systems operations could be altered to improve the overall quality con- <br />ditions of the river. The mathematical simulation model will be a most <br />important tool in these studies. The study is scheduled through FY 1975. <br /> <br />Research <br /> <br />Research has been conducted in irrigation efficiencies, desalting by <br />natural freezing, and modeling for predicting salt and nutrient loading. <br />A cooperative program with the Agricultural Research Service is under <br />way in the Grand Valley to determine the optimal irrigation application <br />rates to maintain crop yields while reducing salt laden return flows. <br /> <br />Considerable other salinity research has been stimulated by the Cro~QIP. <br />This research is providing inputs to the program but it is being funded <br />through other sources. The Nestern Directors of the Agricultural <br />Experiment Stations have established a regional research project entitled <br /> <br />-12- <br />