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Further, if it is assumed or intended to return non - consumptive flows to the Colorado River <br />System for return flow credit, the wastewater treatment facilities for Southern Nevada may also <br />need to be expanded. However, since the newly created supply does not affect existing <br />Compact entitlements, the water may be used for any beneficial consumptive purpose. <br />4.0 PROJECT CAPACITY <br />The desalting plants to be built on the Sea of Cortez should be constructed in increments of <br />capacity that would generally follow the demand curve for water in Southern Nevada. <br />From existing considerations of population growth and water conservation measures resulting <br />in water demand curves of various slopes, it may be concluded that about 50,000 ac -ft <br />(61,650,000 M3) of new capacity will be needed in the range of five to ten year intervals after <br />the year 2005 (depending on conservation measures), but other water right leases, transfers, or <br />water banking could extend existing supply to meet the demands of the year 2010±. <br />a <br />Let us further assume that for each unit of water diverted from lake Mead, 60 percent goes to <br />consumptive use and 40 percent becomes return flow -- after suitable treatment. In that case, <br />about 30,000 ac -ft per year (37 x 106 M3) of desalting capacity installed in Mexico would <br />support withdrawal of about 50,000 ac -ft (62 x 106 M) /year from Lake Mead. <br />Taking into account a capacity factor of 90 percent, production of 30,000 ac -ft (37 x 106 M3) <br />per year of desalted water requires a plant with a daily production capacity of 30 mgd <br />(1.31 M3 /sec). <br />t <br />a6 Carollo Black & Veatch <br />