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<br />000616 <br /> <br />~ <br /> <br />, <br /> <br />North Dakota on water availability in northern South Dakota. At the present <br /> <br />time, a useful model cannot be developed because the hydrologic effects of Sand <br />Lake National Wildlife Refuge are unknown. <br />South Dakota and Iowa need to ensure compatibility of water supply and <br />water use data and to coordinate their flood plain management activities along <br /> <br /> <br />the Big Sioux River since the river is their border. Nebraska and South Dakota <br /> <br /> <br />need to ensure data compatibility and to coordinate their activities along the <br /> <br /> <br />Missouri River because that river is their border. <br /> <br /> <br />Federal/State <br /> <br /> <br />Lack of ground-water quantity and quality information and an inadequate <br /> <br /> <br />streamgaging network are problems throughout the subbasin. To a lesser extent, <br /> <br />water use, soils, and topographic data need to be collected. <br />FLOODING <br /> <br />. <br /> <br />Urban and Built-Up <br />The slope of the James River is much less than that of its tributaries. <br /> <br />On the average, one major flood has occurred along the James River every 15 <br /> <br />years. The Jamestown and Pipestem Reservoirs have essentially curtailed major <br />flood damage at Jamestown and downstream to the South Dakota State line, <br />although some local flooding from tributaries occurs in Oakes, North Dakota. <br />Other cities along the James experience minor flooding problems. <br />The Big Sioux River has caused flooding problems at Brookings, South <br />Dakota, that are compounded by Six Mile Creek runoff; at North Sioux City; at <br />Flandreau, and Trent, South Dakota, where damages occur almost every year; Dell <br />Rapids, South Dakota, with six floods in 25 years; Rock Valley, Iowa, with five <br />floods in 38 years; and Castlewood, Bruce, Watertown, Dempster, and Estelline, <br />South Dakota. <br /> <br />H-19 <br />