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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />1'U1"3" <br />j J. U '. ,] <br /> ACRES TO BE <br />STATE PROJECT ASA SERVED <br />Other authorized projects not included in MCC: <br />Montana Hardin Unit, 1004 42,600 <br /> Lower Big Horn <br /> Division <br />Wyoming Muddy Ridge Area 1004 9,000 <br /> Riverton Project <br /> Polecat Bench Area 1004 19,200 <br /> Shoshone Extensions <br /> Unit <br />North Dakota Apple Creek Unit 1005 160,000 <br />South Dakota Pollock-Herreid 1005 15,000 <br /> Unit <br />Colorado Narrows Unit 1007 287,070 <br />Water Use <br /> <br />The assumptions and methodologies used in deriving estimates of water <br />use for each of the seven functional categories as used in the Modified <br />Central Case are described and discussed briefly in the following paragraphs: <br /> <br />Domestic Central <br /> <br />The Water Resources Council utilized data from the Geological Survey <br />sources used to produce their circular 676, "Estimated Use of Water in the <br />United States in 1970." Withdrawal estimates were obtained directly from the <br />Geological Survey data as the residual of total public supplied withdrawals less <br />industrial and commercial from public supplies. Estimates of water consumed <br />were obtained by assuming the ratio of total public supplied consumption to <br />total public supplied withdrawal in the Geological Survey data. The 1975, <br />1985 and 2000 domestic central system withdrawal and consumption were esti- <br />mated from the 1970 Geological Survey data as follows: (1) 1970 per capita <br />use rates were obtained using the r,eological Survey's 1970 population served <br />figure and (2) these per capita figures were multiplied by the 1975, 1985 and <br />2000 population served by central systems as estimated by the Department of <br />Agriculture. It was further assumed that per capita withdrawal and consumption <br />rates would remain constant over the projection period. The procedures used in <br />computing domestic central water use obviously result in underestimating <br />actual use since industrial and commercial withdrawals from public supplies are <br />not included; however, the effects in determining total water supplies available <br />and used are relatively insignificant within the Missouri River Basin except <br />perhaps in the Denver area in ASA 1007. It is also significant that less than <br />one-half of the 8.8 million people in the basin are served by surface supplies <br />with the remainder served by ground water, which may further tend to minimize the <br />effects on surface water availability. <br /> <br />III-3 <br />