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21-21 LAW OF THE COLORADO RIVER ~ 21.03[2] States must sustain. "[T]he actual burden on the American water supply occasioned by this guarantee is about 1.8 mil- lion." 75 [2] Restrictions on the Upper Basin Ifthe Compact is interpreted to require that the Upper Ba- sin release 7.5 m.a.f. at Lee's Ferry pursuant to Article IlI(d), as well as another 750,000 acre-feet pursuant to Article III(c) to-satisfy the Mexican Treaty, the Interior Department has calculated that only 5.8 m.a.f. of the Upper Basin's 7.5 m.a.f. Article Ill(a) apportionment would then be available for Up- per Basin use/6 (This number will be regarded as ridicu- lously high when the 16th century dry cycle is repeated.) An engineering study undertaken by Tipton and Kalmbach, Inc. at the request of the Upper Colorado River Commission pro- duced a similar result. This analysis concluded that 6.3 m.a.f. of water per annum would remain for Upper Basin consump- tion if 7.5 m.aJ. were delivered on the average at Lee's Ferry and if no additional water was required at Lee's Ferry to serve the Mexican Treaty/7 However, if the latter assump- tion were reversed to conform to the Interior Department's outlook, then only 5.55 m.a.f. of water would remain for the Upper Basin. On the basis of the Interior Department's 5.8 m.a.f. prediction, which may be overly optimistic, New Mex- ico would receive 647,000 acre-feet, instead of its full entitle- ment of 838,00078 of the 7.5 m.a.f. Article Ill(a) Upper Basin apportionment; Colorado would receive 2,976,000 acre-feet instead of 3,855,000;79 and Utah would receive 1,328,000 acre-feet instead of 1,713,500.80 Utah, for one, has apparently already resigned itself to a life permanently within the Con- 75 H.R. Rep. No. 1312. supra note 25, at 3696. 76 U.S. Department of Interior, Water for Energy Man~ement Team, Report on Water for Energy in the Upper Colorado River Basin 11-12 (1974). 77 rd. 78 Memorandum from Felix Sparks, Director, to Colorado Water Conservation Board and Colorado Water Congress Executive Committee, at 3 (January 17. 1978). 79 rd. at 7. 80 Clyde. "Institutional Response to Prolonged Drought" in New Courses for the Colorado River, supra note 5. at 133-34.