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<br />. <br /> <br />a. Present Level of Depletions <br /> <br />~.-... <br />-.,J <br />CJl <br />r- <br /> <br />The BR compiled the hydrologic data used in the assessment. <br /> <br /> <br />Starting with streamflow records for the period 1906-1974, <br /> <br /> <br />adjustments were made to reflect the impact of the present <br /> <br /> <br />level (1975-76) of surface-water depletions. It is important, <br /> <br /> <br />however, to remember that from 1906 to the mi d-1920' s was an <br /> <br /> <br />extremely wet period. Thus, the 1906-1974 period gives a <br /> <br /> <br />considerably more optimistic view of water supply than if the <br /> <br /> <br />period 1930 through 1974 had been used, during which two severe <br /> <br /> <br />droughts occurred. <br /> <br />b. Projected Depletion Levels <br /> <br />. <br /> <br />l' Future target dates for which projections were made were <br /> <br /> <br />the years 1985 and 2000. The differences, however, <br /> <br /> <br />between 1975 and 1985 were too insignificant for consider- <br /> <br /> <br />ation. Actual assessment analyses were limited to three <br /> <br />levels of development in the year 2000 that is, (1) pro- <br /> <br /> <br />jected development for all users other than oil shale and <br /> <br /> <br />coal gasification facilities, (2) development of oil shale <br /> <br /> <br />and coal EEl's to the Baseline level, and (3) development <br /> <br />of EEl's to DOE's accelerated synfuel level. <br /> <br />. <br /> <br />The assessment considered three levels of projected <br /> <br /> <br />development without EEl's: low, medium, and high. To <br /> <br /> <br />briefly recapitulate definition of these in chapter 4 of <br /> <br />39 <br />