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Table 16A Pacific Southwest Water Plan Estimate of Colorado River Water Available for Use in the Pacific Southwest at and below Hoover Dam Unit: 1,000 a.f. Item Development Year Present 1975 1990 2000 Release at Glen Canyon Dam 1 10,350 9,840 9,100 8,600 Paria River inflow 20 20 20 20 Flow at Lee Ferry 10,370 9,860 9,120 8,620 Undepleted net gain--Lee Ferry to Lake Mead 2 1,060 1,060 1,060 1,060 Depletions--Lee Ferry to Lake Mead 3 260 450 470 490 Lake Mead evaporation 840 900 850 800 Lake Mead storage drawdown 4 120 210 350 450 Available for release at Hoover Dam 10,450 9,780 9,210 8,840 Bill Williams River inflow 80 70 70 70 Net losses--Hoover Dam to Mexico 5 1,270 1,270 1,270 1,270 Future salvage--Hoover Dam to Mexico 6 0 680 680 680 Mexican Treaty obligation 1,500 1,500 1,500 1,500 Available for use at and below Hoover Dam 7,760 7,760 7,190 6,820 1/ Virgin flow 1930-62, less upper basin depletions. 2/ Includes Lake Mead precipitation. 3/ Includes tributary uses and mainstream reservoir evaporation. 3/ Based on 1930-62 operation. 5/ Includes net reservoir evaporation (370), regulatory losses (230), and other net losses (670). 6/ Includes Senator Wash Dam (170), ground-water recovery (220), and other mainstream salvage (290). IV-11Epson Perfection 4870 Photo, 400 dpi, 8 bit, 14,194,688 byte