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900000 <br /> 800000 <br /> 700000 <br /> 600000 <br /> m 500000 -- -- <br /> 400000 <br /> 300000 ---- — <br /> 200000 <br /> 100000 <br /> 0 <br /> 1950 1955 1960 1965 1970 1975 1980 1985 19W 1995 2000 2005 <br /> Figure 1. Estimated Groundwater Pumping for Irrigation from the S. Platte Alluvial Aquifer, <br /> 1950—2006. <br /> Source:Historic Crop Consumptive Use Analysis South Platte Decision Support System(Final Report),p.44,by Leonard Rice <br /> Engineers,Inc.,2010,Denver,CO. <br /> A number of studies have examined the alluvial aquifer of the S. Platte River and its tributaries. <br /> Stratigraphy of the alluvial deposits was originally described by Hunt(1954) and Scott(1960) <br /> and later by Scott(1963a). Several workers developed maps of the S. Platte alluvial aquifer <br /> extent,thickness, and depth to water beginning in the 1950s (Bjorklund and Brown, 1957; Smith <br /> and others, 1964; Duke and Longenbaugh, 1966;Nelson and others, 1967; Hurr, Schneider, and <br /> others, 1972a, 1972b, 1972c; Hurr and others, 1975; Konikow, 1975;Nadler and Schumm, 1981; <br /> Robson, 1996; and Robson, Arnold, and Heiny, 2000a, 2000b; Robson, Heiny, and Arnold, <br /> 2000a, 2000b). The South Platte Decision Support System(SPDSS) compiled selected maps of <br /> these features into Geographic Information System (GIS) data sets (CWCB, 2006b). Robson <br /> (1989) described the interconnection between bedrock and alluvial aquifers in the study area. <br /> The SB06-193 study conducted by the CWCB revealed that there is an estimated 10 MAF of <br /> stored water in the S. Platte alluvial aquifer; 14 MAF if the designated basins are included. The <br /> study also estimated there is some 7 MAF of unsaturated alluvium that some fraction of which <br /> would be available for aquifer storage (Table 1). <br /> 45 <br />