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" 21-11 LA W OF THE COLORADO RNER ~ 21.02[5] ter provided to them by the 1922 Compact.29 The Upper Colorado River Compact apportions to each Up- per Basin state the following percentage of the Upper Ba- sin's total consumptive use of River water per annum: Colo- rado, 51.75%; Utah, 23%; Wyoming, 14%; New Mexico, 11.25%. Arizona, whose northeast corner drains into the Up- per Basin, was given a flat 50,000 acre-feet a year. "Con- sumptive use" -was defined by Article VI as the man-made depletions of the virgin flow measured at Lee's Ferry. This definition, controverted by the Lower Basin, allows evapora- tion and channel losses that would have occurred without a state's diversions to be set off against its depletions.30 Article IV of the Compact adjusts a state's apportionment in the event it has overdrawn in the prior ten years. Reservoir losses are apportioned to each state by Article V. [5] Colorado River Storage Project Act of 1956 Passed despite opposition from southern California,31 the Colorado River Storage Project Act of 195632 was one fruit of the Upper Colorado River Basin Compact. It authorized con- struction and operation of dams and power plants at Glen Canyon, Flaming Gorge on the Green River, Curecanti (newly renamed Wayne Aspinall) on the Gunnison River, and a dam at Navajo on the San Juan River. In a compro- mise with conservationists, a proposal to build a dam at Echo Park on the Green was disapproved. The Act authorized the initial phase of the Central Utah Project. It established an Upper Colorado River Basin Fund to which operating reve- nues would be credited and provided a percentage formula to distribute surplus money in the Fund to each Upper Basin state. " 29 See J, Muys, Interstate Water Compacts: The Interstate Compact and Federal-In- terstate Compact 24-25 (National Water Commission Legal Study No, 14, 1971). 30 Indeed, this is often considered to be one of the major bones of contention be- tween the two Basins, See, e.g., Giltches, supra note 7, at 423. 31 Hundley, supro note 23. at 29. 3243 U.S.C ~ 620 (1982).