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<br />. <br /> <br />INTRODUCTION (continued) <br /> <br />B. <br /> <br />Previous Reports <br /> <br />.... <br />o <br />~ <br />(\) <br /> <br />A series of nine reports startin~ with the 1963 edition have been <br />prepared prior to this report. Each succeeding report updated the previous <br />report and added changes which occurred within the 2-year interval. <br /> <br />In addition to including 2 more years of record, the major changes in <br />this report from the January 1979 report are as follows: (1) transferring <br />that part of the future estimated depletions that actually occurred during <br />the 2 years to present depletions; (2) updating Part VIII "Colorado River <br />Salinity Control program" in order to report on the progress of investiga- <br />tianA, planning, and construction of salinity control units as required <br />under Title II Section 206 of the Colorado River Basin Salinity Control <br />Act, Public Law 93-320; (3) updating the depletion schedule for future <br />conditions, such as removing the Resources, Ine. - Kaiparowits Project and <br />adding the Mill Creek Project. Fruitland Mesa and Savery-Pot Hook Projects <br />have not been de-authorized and therefore are left on the map but were not <br />included in the computations due to their inactive status. <br /> <br />C. Cooperation <br /> <br />.i <br /> <br />This report was prepared by the Water and Power Resources Service. <br />The Geological Survey provi~ed most of the basic data. A continuing <br />cooperation program between the Water and Power Resources Service and the <br />Survey for the collection of streamflow quality data and the exchange of <br />information has been in effect for a number of years. This cooperation <br />provides for the collection of data at stations other than basic data <br />stations maintained by the Geological Survey in order to obtain additional <br />data at key points in the basin. <br /> <br />In the TIpper 'Basin, data are obtained at various points along the <br />river and in drains cooperatively with the Geological Survey and other <br />agencies. 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, surface return flows, and major river stations. <br />The Water and Power Resources Service is the lead agency of an ongoing task <br />force for coordinating the collection of other quality data in the Lower <br />Basin. Other members of the task force include representatives from the <br />Geo logical Survey, Internat ional Boundary and Water Commi ssion, and EPA. <br /> <br />. <br /> <br />6 <br />