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<br />On2~?1 <br /> <br />WATER SOURCE ANALYSIS <br /> <br />SOURCE <br /> <br />The water source for Omaha District's water transfer studies is <br /> <br /> <br />Lake Francis Case at Fort Randall Dam in southeastern South Dakota <br /> <br /> <br />shown in figure 7. Fort Randall Dam is the second most downstream of <br /> <br /> <br />six large dams on the Missouri River beginning with Fort Peck Dam, <br /> <br /> <br />Montana, and ending with Gavins Point Dam near Yankton, South Dakota. <br /> <br /> <br />Altogether, these six dams contain about 69.9 million acre-feet (MAF) <br /> <br />of storage available for conservation and 4.7 MAF for exclusive flood <br /> <br /> <br />storage. Conservation storage is managed to permit channel navigation <br /> <br />from Sioux City, Iowa, to the mouth; to generate hydropower; to supply <br /> <br /> <br />water for municipal, industrial and irrigation needs; and to serve fish, <br /> <br />wildlife, and recreation functions. Hydropower is generated at each of <br /> <br />the six dams for a total production of about 10 billion kWh annually. <br /> <br />HYDROLOGIC INFORMATION <br /> <br />Streamflows, Depletions, and Resolution 6 <br /> <br />The principal uses of water from the main stem reservoir storage <br /> <br />are for navigation and hydropower. When system storage is at desirable <br /> <br />levels, releases during the navigation season from 1 April to <br /> <br /> <br />30 November are scheduled to provide full service navigation with target <br /> <br />flows of 31,000 cubic feet per second (c.f.s.) at Sioux City and Omaha. <br /> <br /> <br />Greater releases are usually necessary to meet higher target flows of <br /> <br /> <br />37,000 c.f.s. at Nebraska City, Nebraska, and 41,000 c.f.s. at Kansas <br /> <br /> <br />City, Missouri. During extended dry periods when multiple use storage <br /> <br />is limited, discharges are reduced as much as 6,000 c.f.s. below full <br /> <br /> <br />service levels, which results in minimum service navigation. Following <br /> <br />the navigation season, release rates are dependent upon the amount of <br /> <br />water stored in the reservoirs. When excess water is present and the <br /> <br />necessity to vacate flood storage exists, system releases up to 23,000 <br /> <br />A14 <br />