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<br />, <br /> <br />~ <br /> <br />. <br /> <br />. <br /> <br />, <br /> <br />ation of the effects of demands exceeding 5.8 MAF was accomplished 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 increase <br />was distributed throughout the Upper Basin and among the States by their <br />approximate percentage share of Colorado River water. For small increases, <br />such as from 5.8 MAF to 5.87 MAF, the increase was lumped at one demand <br />point near the bottom of the system. <br /> <br />As to water use in the Upper Basin, subsection (b) of Article III of the <br />Upper Colorado River Basin Compact permits New Mexico or any other Upper <br />Basin State to use waters in excess of its percentage allotment, provided <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 year <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 eRSS. This data base consists of computed monthly <br />natural flows at key points throughout the Colorado Ri~er 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 with <br />stochastically generated flows which were disaggregated throughout the <br />Upper Basin. During the next few months, the hydrology data base is <br />scheduled to be updated through 1985 and the provisional data thus <br />eliminated. Updates to the hydrology data base are planned every five <br />years following publication of the Colorado River System Consumptive Uses <br />and Losses Report. The report is prepared every five years pursuant to the <br />Colorado River Basin Project Act of 1968, (P.L. 90-537). <br /> <br />4 <br />