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<br />"U?/?7 <br />~ ~l~ <br /> <br />320 MW at Fort Randall Dam and 100 MW at Gavins Point Dam, is available <br />downstream from the proposed diversion. <br /> <br />The loss in energy generation by the year 2020 would be about 15 <br /> <br /> <br />percent from 1975 levels due to in-basin development and another 7 per- <br /> <br />cent if 5.26 MAFA is diverted to the High Plains. The loss would be <br /> <br /> <br />almost evenly distributed throughout the year. The peaking capacity <br /> <br /> <br />would not be significantly affected. <br /> <br />ENVIRONMENTAL ASSESSMENT <br /> <br />Studies for the Environmental Assessment were conducted assuming <br /> <br /> <br />a maximum diversion of 5.26 MAFA from the Missouri River. In late 1981, <br /> <br /> <br />the future estimated water demands of some states were changed. This <br /> <br />resulted in a maximum diversion of 4.40 MAFA. The effect of this would <br /> <br />be minor changes in land areaS required by some reservoirs and canals. <br /> <br />Effects on Reservoir System <br /> <br /> <br />Recreational and environmental attributes of the main stem reser- <br /> <br /> <br />voirs are generally enhanced by full-pool levels. Future depletions, <br /> <br /> <br />when combined with water requirements to sustain navigation below Sioux <br /> <br />City, will result in lower average pool levels and greater fluctuations <br /> <br /> <br />in levels from year to year. Table 5 summarizes pool level impacts <br /> <br />by comparing the proportion of time that pool levels are within a <br /> <br /> <br />20-foot normal fluctuation zone. <br /> <br />~2 <br />