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<br /> <br />----..; <br /> <br />--.' <br />._. )00 <br /> <br />. <br /> <br />. <br /> <br /> <br />001875 <br /> <br />water..level measurements ~lere made in 323 observation wells and 10 water-level <br />recording gages were operated. <br /> <br />Measurements were made of the water level in 88 observation wells in the <br />Crow Creek-Sand Lake area and in 19 wells in the Angostura project. In the <br />vicinity of For.~ Randall DalIl 4 water..level recording gages and 2 water..pressure <br />recording gages were operated; also, water levels were measured in 2 wells and <br />in 22 piezometer tubes. <br /> <br />Under agreement with the U. S. Public Health Service, aquifer tests were <br />made by PUIIlPing the water..supply wells at the Pine Ridge and Rosebud. Indian <br />Agencies. <br /> <br />NEBRASKA <br />In cooperation with the Conservation and Survey Division of the <br />University of Nebraska, an estimate was made of ground-water flow from South <br />Dakota into Nebraska within the drainage basins of the Niobrara River and <br />Ponca Creek. Sixteen test holes were drilled along the state line to <br />determine the physical properties and thickness of the zone of saturation, <br />and a water-table contour map was made of an area straddling the state line. <br /> <br />Also as part of the cooperative program, 40 test holes were drilled in <br />the drainage basins of the Loup and Elkhorn Rivers and the inventory of <br />irrigation wells in Hamilton County was completed. Water-level measurements <br />were made in numerous observation wells, and 28 water-level recording gages <br />were kept in operation. <br /> <br />2. <br />