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<br />, a tion of the. effects of demands exceeding 5,8 MAF was accompli shed by <br />simply increasing the depletions in the year 2040, with no attempt to <br />prorate the increased amount back over several years or decades. For <br />relatively large increases, such as from 5.8 MAF to 6.3 MAF, the increa <br />o was distributed throughou.t the Upper' Basin and among the states by thei <br />C') approximate percentage share of Colorado River water. For small increas <br />W <br />~ such as from 5.8 MAF to 5.87 MAF, the increase was lumped at one demand <br />en point near the bottom of the system. <br />c.Jl <br /> <br />AS to water use in the Upper Basin, subsection (b) of Article III of the <br />Upper Colocado River Basin Compact permits New Mexico or any other Upper <br />Basin State to use waters in excess of its percentage allotment, provide <br />such excess use does not prohibit any of the remaining States from <br />utilizing its respective allotment. This excess of allotted use for New <br />Mexico is demonstrated in Appendix I as projected negative values by yea <br />2000. Thus the availability of Navajo Reservoir water for municipal and <br />industrial purposes in New Mexico beyond the year 2005 depends upon the <br />extent of water use in the entire Upper Basin beyond year 2005 as well as <br />upon the physical availability of water in Navajo Reservoir. <br /> <br />A. Study Approach and Results <br /> <br />1. Hydrology <br /> <br />The basis for the current hydrologic determination is the hydrology data <br />base used for the CRSS. This data base consists of computed monthly <br />natural flows at key points throughout the Colorado River Basin and is <br />complete from 1906-1980. The data have been extended to include the years <br />1981-1986. The years 1981, 1982, and 1983 were estimated utilizing <br />recorded flows and reservoir operations in so far as possible, with <br />estimated consumptive use. The years 1984, 1985, and 1986 were estimated <br />using estimated consumptive use and basin runoff values in conjunction wit <br />stochastically generated flows which were disaggregated throughout the <br />Upper Basin. The hydrology data base is currently scheduled to be updated <br />through 1985 and the provisional data thus eliminated. Updates to the <br />hydrology data base are planned every five years following publication of <br />the Colorado River System Consumptive Uses and Losses Report. The report <br />is prepared every five years pursuant to the Colorado River Basin project <br />Act of 1968, (P.L. 90-537). <br /> <br />4 <br />