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9 000790 High Plains Aquifer For most of the High Plains Aquifer, the saturated thickness was estimated from maps of configuration of the base of the High Plains Aquifer (Watts and Stullken, 1981) and altitude of the water table in the High Plains Aquifer, 1980 (Pabst and Stullken, 1984)0 Data from the UoSo Geological Survey's Groundwater Site Inventory data base was used to update and modify the 1980 water table mapo Saturated thickness in part of the Pawnee River Valley was based on data from Sophocleous (1980)0 In western Meade and northern Clark counties where recent water level mBasurements are lacking, the saturated thickness from "Irrigation in Kansas" was used (Kansas Water Resources Board, 1967)0 Great Plains and Ozark Plateau Aquifers Saturated thickness of the Great Plains and Ozark Plateau aquifers was assumed to be the same as the thickness of the rocks that contain the aquifers, except in the area where a map of water level altitudes and freshwater equivalent heads indicated the water table was below the top of these rocks 0 There the saturated thickness was estimated by reducing the rock thickness by the amount that the water table was below the top of these rockso The maps used to determine the saturated thickness of the Great Plains Aquifer are unpublished maps made for the Central Midwest Regional Aquifer System Analysiso Term (b): Specific Yield Specific yield is the ratio of the volume of water that will drain by gravity from a volume of saturated deposits to the volume of undrained saturated depositso In order to determine the value of term "b" in equation (1) for each aquifer, values of specific yield were chosen based on published maps, reported values and hydrologic jUdgment 0 These values are discussed below for each aquifero Alluvial Aquifers In the Kansas-Lower Republican River Basin a value of 002 was used for the alluvial deposits of the Lower Republican River and its tributaries based on the value used by Fader (1968) and shown on a map of specific yield by Bayne and Ward (1969)0 A value of 0015 was chosen for the alluvial deposits of the Kansas River based on an average value from Fader (1974); the same value was chosen for the alluvial deposits of the Big Blue River and its tributaries based on the value shown on the map of Bayne and Ward (1969)0 A value of 001 was used for the alluvial deposits of the other tributaries to the Kansas River based on the map of Bayne and Ward (1969) and hydrologic judgment that tributaries should have lower specific yields than the mainstem streamo