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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 1968, largely laced the r <br /> y rep groundwater pumpage. The <br /> principle source of recharge to the water table is now infiltration and percolation of <br /> ra, imported surface waters applied to irrigated lands (recharge formerly was supplied <br /> tr <br /> primarily by streams entering the Valley from the eastern and northern side). Most <br /> w aquifer discharge, previously occurring as evapotranspiration and seepage to streams, is <br /> �e <br /> now from pumping wells (Johnson, 1989). The current interrelationships of topography, <br /> purnpage,and artificial recharge can cause local groundwater flow to be complicated and <br /> y <br /> difficult to predict. <br /> s <br /> k <br /> f 2-7 <br /> 175-07.11.5 4124191 <br />