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<br /> <br />INTRODUCTION <br /> <br />o <br />U) <br />W <br />c,.. <br /> <br />seditlent, ionic loads of consti tuents ~ and ter.rperat'2'e of water: (?) re- <br />vising and undat.ing the section on quality control i" accordance .,nth the <br />roe....ly instit~rt.ed ".\'iater Quality Improvemer,t Prograrr,;" (4) reduci~b s.v.erage <br />present estimated evaporatior. of the Upper Basir. Storage HeservolrS lr~r:l <br />649.000 acre-feet 11 year to 541,000 acre-feet (this is latest evaporatlon <br />esti~ate, pending results ITom new investigations presently being con- <br />ductei): (5) ass~~ng no salt return ~Tom future ste~~ po~erplant uses or <br />from rJ&I use:;; on the Seedskadee Project. Because of the changes in (4) <br />and (5) the present modified and future concentrations were reduced iTem <br />those in the 1971 report. <br /> <br />c. <br /> <br />Sco-oe <br />~ <br /> <br />This report presents data concerning (1) the historical quantity and <br />quality of the flows of the Colorado River and its principal tributaries <br />for the 1941-70 period: (2) an evaluation of historical conditions modi- <br />fied to reflect present development; and (3) a projection of the range of <br />salini~y conditions resulting from future development at 17 selected sta- <br />tions 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 devoted to water quality parameters other than salinity. <br /> <br />D. Cooperation <br /> <br />This repor-: was prepared Chiefly by the Bureau of Reclamation. The <br />Geological Survey provided most of the basic data and prepared a tech- <br />nical study (Part XI) on salinity in the Flaming Gorge Reservoir and <br />in other reaches of the river. A co~tinuing cooperative program between <br />tee Bureau of Reclamation and the Survey for the collection of streamflow <br />quality data and the exchange of information has been in effect for a num- <br />ber of years. This cooperation provides for the collection of data at <br />stations other than those normally maintained by the '~ological Survey in <br />order to obtain additional data at key points in the basin. <br /> <br /> <br />In the Upper Basin, data are obtained at various points along the <br />river and in drains cooperatively ..Ii.th the Geological Survey and other <br />agencies. Along the main stem below Lees Ferr'J. data UP. obtained on <br />a regular basis at a network of stations that includes essentially all <br />significant diversions. surface return flows. and ~ajor river stations. <br />Portions of this network are being used in an intensive measurement <br />program which began in January 1970 ~th the objective of determining <br />the source of the salt load arriving at Imperial Da."ll. The Bureau of <br />Recl~ation is the lead agency of an ongoing task force for coordinating <br />the collection of other quality data in the Lower Basin. This task <br />force is composed of representatives from the Geological Survey, In- <br />ternational Boundary ~~d ~ater Commission, and Environmental Protection <br />';genC:f. <br /> <br />4 <br /> <br />- - <br />