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<br />Chapter 4 <br /> <br />PRESENT AND FUTURE DEVELOPMENT <br /> <br />This section of the report summarizes the projected depletions used by the Bureau of <br />Reclamation to evaluate the effects of water use and depletions. Table 3 summarizes <br />the estimated depletion of water through full basin development for the mainstem of <br />the Colorado River. The projections were made in consultation with individual States <br />within the Colorado River Basin and the Upper Colorado River Commission; however, <br />the States do not necessarily concur with the projections adopted by Reclamation for <br />planning purposes. <br /> <br />Nothing in this report is intended to interpret the provisions of the Colorado River <br />Compact (45 Stat. 1057), the Upper Colorado River Basin Compact (63 Stat. 31), the <br />Water Treaty of 1944 with the United Mexican States (Treaty Series 994; 59 Stat. <br />1219), the decree entered by the Supreme Court of the United States in Arizona v. <br />California et al. (376 U.S. 340), the Boulder Canyon Project Act (45 Stat. 1057), the <br />Boulder Canyon Project Adjustment Act (54 Stat. 774; 43 U.S.C. 618a), the Colorado <br />River Storage Project Act (70 Stat. 105; 43 U.S.C. 620), or the Colorado River Basin <br />Project Act (82 Stat. 885; 43 U.S.C. 1501). <br /> <br />UPPER BASIN DEPLETIONS <br /> <br />Table 3 summarizes estimates of future depletions due to water development in the <br />Upper Colorado River Basin and lower mainstem. The starting points for the <br />depletion projections ("1965 Framework Study") were developed from the Upper <br />Colorado Region Comprehensive Framework Study. The comprehensive framework <br />study established normalized depletion levels for the 1965 level of water resource <br />development. <br /> <br />1966-90 Changes-in table 3, bring the depletions estimates up to the 1990 level of <br />development. <br /> <br />Anticipated Depletions-in table 3, represent depletions at full development by <br />projects which have come on-line, are under construction, or are relatively certain to <br />proceed in the near future. <br /> <br />Potential Depletions-in table 3, represent depletions at full development by <br />projects which are still in the planning stages, or supplies which are reserved for <br />future development (such as energy) at some point but which point is currently <br />uncertain. <br /> <br />The Upper Colorado River Basin Compact provides that the States of Arizona, <br />Colorado, New Mexico, Utah, and Wyoming will share in the consumptive use of water <br />available in the Upper Basin in the following proportions: Arizona, 50,000 acre-feet; <br />Colorado, 51.75 percent of the remainder; New Mexico, 11.25 percent of the remainder; <br />Utah, 23.00 percent of the remainder; and Wyoming, 14.00 percent of the remainder. <br />Each Upper Basin State is charged a proportionate share of the total evaporation from <br /> <br />~ <br /> <br />17 <br />