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<br />~... <br /> <br />Basin Yield <br /> <br />Assume water available for Lower Basin use is the Basin Yield, <br />minus the Upper Basin use. <br /> <br />· Basin Yield can be determined in a number of ways, including: <br />· the total basin use which will keep Mead elevation above the <br />protected elevation with some probability <br />· for 80% assurance of protecting 1050 foot elevation, the <br />basin yield is 12.581 maf, using stochastic hydrology <br />· for 80% assurance of protecting 1050 foot elevation, the <br />basin yield is 12.3 maf, using historical hydrology <br /> <br />· Additions to this alternative: <br />· shortage trigger at 930 feet <br />· 70Rl surplus alternative <br /> <br />US Bureau of Reclamation <br /> <br />June 3, 1997 <br />