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<br /> <br />Term (a): Volume of Deposits Saturated by Freshwater <br /> <br />In order to determine the value of term "a" for each aquifer, a <br />graph of the volume of deposits saturated with freshwater was <br />made by plotting the area within each saturated thickness contour <br />(obtained by digitizing the saturated thickness map) against the <br />value of the contouro The graph was then digitized to determine <br />the volume of deposits saturated with freshwater. . This was done <br />for each aquifer in each county in the river basin, except where <br />there was only one saturated thickness contour value. Then the <br />area within the single contour value was multiplied by what was <br />estimated to be the average thickness of the area to determine <br />the volume of deposits saturated with freshwater. If no other <br />information was available, the average thickness was the contour <br />value plus one-fourth of the contour interval. The sources and <br />methodology used for determining saturated thickness of different <br />aquifers are given below: <br /> <br />Alluvial Aquifers <br /> <br />The set of maps of saturated thickness in "Irrigation in Kansas" <br />(Kansas Water Resources Board, 1967) was the primary source for <br />the saturated thickness of aquifers in alluvial depositso The <br />boundaries of the aquifers in alluvial deposits were modified to <br />better fit the limits of the alluvial deposits as shown on the <br />state geologic map (Kansas Geological Survey, 1964)0 In parts of <br />northeastern Kansas, the saturated thickness was calculated from <br />water level measurements from the UoSo Geological Survey's <br />Groundwater Site Inventory data base and a map of depth to <br />bedrock by Bayne (1975). In the Neosho, Verdigris, Walnut and <br />Lower Arkansas river basins, the saturated thickness was modified <br />by data from Morton and Fader (1975) and Fader and Morton (1975b <br />a~d 1975a), respectivelyo In the Arkansas River Valley, <br />saturated thickness was based on data from Barker and others <br />(1983)0 <br /> <br />Glacial Aquifers <br /> <br />In the area of northeastern Kansas where glacial deposits are <br />widespread, well information from Denne and Miller (1985), <br />saturated thickness maps from Ward (1973 and 1974) and the <br />location of preglacial drainage from Denne and others (1982) were <br />used to define thickness and location of the saturated thickness <br />of the aquifers in glacial deposits. Maps from "Irrigation in <br />Kansas" (Kansas Water Resources Board, 1967) and the location of <br />glacial deposits from the state geologic map (Kansas Geological <br />Survey, 1964) also were used to define the thickness and extent <br />of the saturated thickness, especially west of Nemaha Count Yo <br /> <br />8 <br />