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<br />. <br /> <br />H <br />o <br />o <br />o <br /> <br />. <br /> <br />. <br /> <br />INTRODUCTION <br /> <br />during the 2 years to present depletions; (2) revising and updating Part <br />IX "Colorado River Salinity Control Program" in order to report on the <br />progress of investigations. planning, and construction of salinity control <br />units as required under Title II Section 206 of the Colorado River Basin <br />Salinity Control Act, Public Law 93-320; (3) changing average present <br />estimated evaporation of the Upper Basin Storage and Navajo and Fontenelle <br />Reservoirs from 541,000 acre-feet a year to 568,000 acre-feet (this is <br />latest evaporation estimate, pending results from new investigations <br />presently being conducted); (4) assuming no salt or water return from <br />future large energy related uses; (5) expanding table 18 to show conditions <br />of 1980, 1990 and 2000 rather than just a single future condition. The <br />iuture conditions in this study were based on a revised depletion schedule. <br /> <br />C. Scope <br /> <br />This report presents data concerning (1) the historical quantity <br />illld quality of the flows of the Colorado River and its principal trib- <br />utaries for the 1941-72 period; (2) an evaluation of historical conditions <br />modified to reflect present development; and (3) a projection of the range <br />of salinity conditions resulting from future development at 17 selected <br />stations in the basin. The potential for salinity control and the current <br />status of salinity control activities are also discussed. A section of <br />the report is also devoted to water quality parameters other than salinity. <br />P~rk IX of this report is a report on the status of the Colorado River <br />Salinity Control program in accordance with requirements of section 206 <br />of Title II of the Colorado River Basin Salinity Control Act (PL. 93-320). <br /> <br />D. Cooperation <br /> <br />This report was prepared chiefly by the Bureau of Reclamation. The <br />Geological Survey provided most of the basic data and prepared a technical <br />~tudy on salinity in the Flaming Gorge Reservoir. A continuing cooperative <br />program between the Bureau of Reclamation and the Survey for the collection <br />of streamflow quality data and the exchange of information has been in <br />effect for a number of years. This cooperation provides for the collection <br />of data at stations other than basic data stations maintained by the Geo- <br />logical Survey in order to obtain additional data at key points in the basin. <br /> <br />In the Upper Basin. data are obtained at various points along the <br />river and in drains cooperatively with the Geological Survey and other <br />a~encies. Along the main stem below Lees Ferry, data are obtained on a <br />regular basis at a network of stations that includes essentially all <br />significant diversions, surfac~ return flows, and major river stations. <br />This network is being used in an intensive measurement <br /> <br />4 <br /> <br />