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<br />4,111,000 acre-feet per year to a high of 5,464,000 acre-feet per <br />year. Not included in these figures is the annual main stem reser- <br />l\:) <br />00 voir evaporati9n, estimated by the USBR to average about 520,000 <br />CJ1 <br />~ acre-feet per annum. . These three projected possible future rates <br />of depletion were not based on institutional or physical limitations <br />on water supply. <br />The highest projected consumptive use~from the mainstream in <br />the Lower Basin by year 1990 was assumed to be 7,500,000 acre-feet. <br /> <br />The low 1990 estimate is only slightly less <br /> <br />7,461,000 acre-feet. <br /> <br />The projections of consumptive use used in this report are not based <br />upon interpretations of the Colorado River Compact. <br />Estimates of both 1973 water use and projected future use through <br />the year 1990 for each of the seven states were furnished by the're- <br />spective Basin States. Since projected water development is subject <br /> <br />to many influences and uncertainties, a range of future water de- <br /> <br />pletion. rates was used. These were identified as low, moderate, and <br />high. In all cases, the states' projections fall within the range <br />of projections used in:the study. <br />Table 3 presents a summary of the projected water use in the <br />Colorado River Basin. Presented in Appendix G are data on 1973 base <br /> <br />. <br />conditions by specific categories of use. These categories are: <br /> <br />, <br /> <br />out-of-basin exports, in-basin agricultural' use. in~baain coal de- <br />velopment which includes water for mining operations and cooling of <br />coal-fired electrical power stations and coal gasification, and in- <br />basin oil shaie and other in-basin uses which include miscellaneous <br /> <br />municipal and industrial use and fish and wildlife uses. <br /> <br />11 Const.UllPtive use as defined by the U.S. Supreme Court means diversions fran <br />the stream less such return now thereto as is ava11able for const.UllPtive <br />use in the United States or in satisfaction of the Mexican Treaty obliga- <br />tion. <br /> <br />-26- <br />