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. . . tv W o ~ Secretary of the Interior, who delegated that authority to the Bureau Initial of Reclamation which began detailed design investigations. analyses based on extensive hydrologic computer modeling revealed that, to meet the differential requirement of Minute No. 242 during the year of the lowest projected runoff, a plant capable of producing 97,000 acre-feet of product water at 254 p/m, with a consequent reject stream of 42,000 acre-feet at 9,093 p/m, would be required. Projections of near average years indicated that plant product would only need to be 60,000 acre-feet, with 26,000 acre-feet of reject. These initial design parameters were used in the formulation of alter- native replacement sources for the reject stream. Current hydrologic modeling indicates that the actual design plant size may differ from the initial findings, but not to an extent that would invalidate the findings of this study. Regardless of the amount of plant product, there would always be some amount of concentrated reject as well. The authorization given by Congress in Public Law 93-320 to also salvage the highly saline desalting plant reject stream was in direct response to concern expressed by the Lower Colorado River Basin States over the present minimal water supplies in the Southwest and anticipated future short- ages; it was the States' attitude that they should not have to bear any substantial shortages of water because of commitments made to Mexico by the Federal Government. Congress imposed only two requirements on the selection of a replacement source for the reject stream: (1) that studies to identify feasible measures will be com- pleted not later than June 30, 1980; and (2) that said studies shall 4