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<br />Groundwater Recharae <br /> <br /> <br />In 1985. the Kansas Water Office and the UoSo Geological Survey <br />(Lawrence District Office) also entered into a cooperative <br />agreement entitled "Estimate of Natural Recharge in Kansaso" <br />Subsequently. in 1986. the UoSo Geological Survey completed <br />studies that provided estimates of the annual recharge by <br />aquifer. county. river basin and for the state. The principal <br />aquifers considered were the same ones that were listed under the <br />Groundwater Storage Sub-section of this reporto <br /> <br />The equation used to estimate the amount of recharge (acre-feet) <br />was: <br /> <br />Groundwater Recharge = (a x b)/12. where <br /> <br />( 2 ) <br /> <br />a = area of recharge (acres) and <br /> <br />b = average recharge (inches)o <br /> <br />These values were calculated as follows: <br /> <br />Term (a): Area of Recharge <br /> <br />A map of areas of recharge was created by overlaying the <br />saturated thickness maps used for determining the volume of water <br />in storage with the state geologic map (Kansas Geological Survey. <br />1964)0 Where the aquifer was exposed at the surface and it had <br />saturated thickness. recharge was assumed to be taking placeo <br /> <br />Term (b): Average Recharge <br /> <br />Measured values of recharge are available only for limited areas <br />in Kansaso To obtain average values of recharge on the regional <br />scale required for this project. a model was used that calculates <br />potential recharge from soils. vegetation and climatic data. The <br />model consists of three programs 0 The first program ~ses the <br />Jensen-Haise solar radiation method (Jensen and Haise. 1963; <br />Jensen and others. 1970) to determine potential <br />evapotranspiration from solar radiation. solar inclination, <br />precipitation and temperature informationo The second program <br />was developed by the UoSo Bureau of Reclamation and modified by <br />Lappala (1978) and by Peckenpaugh and Dugan (1983) to account for <br />the moisture entering. leaving and remaining within the soil zone <br />based on the effects of vegetation and hydrologic characteristics <br />of the soils an~ the data calculated by the potential <br />evapotranspiration programo The third program was modified from <br />Peckenpaugh and Dugan (1983) to estimate mean annual recharge at <br />a series of points based on data from the soil-moisture program <br />that has been proportioned to correspond to the surrounding land <br />use. soils and weather stationso <br /> <br />16 <br />