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This recent intensive groundwater development has been due in large part to a high <br /> level of agricultural activity sustained by a combination of heavy groundwater pumpage <br /> and large imports of surface water. This water importation, primarily into the western <br /> part of the Valley beginning in 1958, largely replaced the groundwater pumpage. The <br /> principle source of recharge to the water table is now infiltration and percolation of <br /> imported surface waters applied to irrigated lands (recharge formerly was supplied <br /> primarily by streams entering the Valley from the eastern and northern side). Most f <br /> f <br /> aquifer discharge, previously occurring as evapotranspiration and seepage to streams, is <br /> now from pumping wells (Johnson, 1989). The current interrelationships of topography, <br /> pumpage,and artificial recharge can,cause local groundwater flow to be complicated and � <br /> difficult to predict. <br /> s <br /> r <br /> s� <br /> s <br /> z <br /> MY ; <br /> 1 <br /> 1, <br /> a <br /> •a <br /> 2-7 <br /> 175-07.R5 4114/91 <br /> a: <br />