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Chapter 4 PRESENT AND FUTURE DEVELOPMENT This section of the report summarizes the projected depletions used by Reclamation to evaluate the effects of water use and depletions for this Progress Report. By necessity, these water use estimates were compiled in 1995 as the first step in evaluation process. They will be updated again in 1997.for the next progress report. Table 3 summarizes the estimated depletion of water . through full basin development for the mainstem of the Colorado River. The projections were made in consultation with individual States within the Colorado River Basin and the Upper Colorado River Commission; however, the Statesdo not necessarily concur with the projections adopted by Reclamation for planning purposes. Nothing in this report is intended to interpret the provisions of the Colorado River Compact (45 Stat. 1057), the Upper Colorado River Basin Compact (63 Stat. 31), the Water Treaty of 1944 ~ith the United Mexican States (Treaty Series 994; 59 Stat. 1219), the decree entered by the Supreme Court of the United States in Arizona v. California et al. (376 U.S. 340), the Boulder Canyon Project Act (45 Stat. 1057), the Boulder Canyon Project Adjustment Act (54 Stat. 774; 43 U.S.c. 6l8a), the Colorado River Storage Project Act (70 Stat. 105; 43 U.S.C. 620), or the Colorado River Basin Project Act (82 Stat. 885; 43 U.S.c. 1501). UPPER BASIN DEPLETIONS Table 3 summarizes estimates of future depletions due to water development in the Upper Colorado River Basin and lower mainstem. The starting points for the depletion projections ("1965 Framework Study") were developed from the Upper Colorado Region Comprehensive Framework Study. The comprehensive framework study established normalized depletion levels for the 1965 level of water resource development. 1966-90 Changes-in table 3, bring the depletions estimates up to the 1990 level of development. Anticipated Depletions-in table 3, represent depletions at full development by projects which have come online, are under construction, or are relatively certain to proceed in the near future. Potential Depletions-in table 3, represent depletions at full development by projects which are still in the planning stages, or supplies which are reserved for future development (such as energy) at some point, but which point is currently uncertain. The Upper Colorado River Basin Compact provides that the States of Arizona, Colorado, New Mexico, Utah, and Wyoming will share in the consumptive use of water available in the Upper Basin in the following proportions: Arizona, 50,000 acre-feet; Colorado, 51.75 percent of the remainder; New Mexico, 11.25 percent of the remainder; Utah, 23.00 percent of the remainder; and Wyoming, 14.00 percent of the remainder. Each Upper Basin State is charged a proportionate share of the total evaporation from unmeasured return flow credits. Values shown for 1990 do not match actual use measured in Decree Accounting but are averages used for modeling. 17