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-;3 l'\j iol::oo N W 1. EXECUTIVE SUMMARY Introduction '\ ;, 'J1his report contains the findings of the Reject Strealn Replacement Study by the Water and Power Resources Service. The purpos,e of the study is to identify for Congress, not later than JUlie, 30, 1$80. a feasible measure, or measures, that could adequately replacll that water which would be lost as reject from the Yuma DesaltiJlg Plant. Both the study and the Yuma Desalting Plant are authorized features of Public Law 93-320, the Colorado River Basin Salinit;t Control Act of June 24, 1974, Since the reject stream will be delivered to the Santa Clara Slough; in Mexico without being counted as part of the 1,500,000 acre-feet of Colorado River water which must be delivered to Mexico each year, it constitutes a water loss to the Colorado River Basin States,' However, in Public Law 93-320, Congress required tha,ta replacement source be found so that no individual State would lose any of: its water entitlement, In the words of Public Law 93-320, "Repla4ement of the reject stream from the desalting plant . , ,'. is recognized as a national obligation, , , ," TJlIeYuma Desalting Plant ,was authorized to desalt the major portion: of the approximately 200,000 acre-feet per year of agricultural ,return, flows from the Wellton-Mohawk Division of the Gila Project, located just east of Yuma, Arizona, A complete history of the events, which ~receded the enactment of Public Law 93-320 and the need for"'" , the de$alting plant can be found in the Bureau of Reclamation April 1977 status Report (Colorado River Basin Salinity Control Project, Title I Division, Desalting Complex Unit, Arizona), .,[ <: '" -1 :,1 " "~: " J ,; -,1, 'x -3 '.b' , j w " ,I 3 "'1. .'}i " j Study Criteria T~esearch for a replacement source of water for the Y'uma Desaltirig Plant reject stream began by identifying the quantity of