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<br />The assumptions made are the same as other investigators have <br /> <br />made. <br /> <br />They are as follows: <br /> <br />For a water-table aquifer, drawdown is considered to be negligibl~ <br /> <br />when compared to the saturated thickness; that is, ! does not change <br /> <br />'with pumping time. <br /> <br />The aquifer is isotropic, homogeneous, and semi-infinite in areal <br /> <br />extent, with a straight, fully penetrating stream boundary. <br /> <br />Water is released instantaneously from storage. <br /> <br />The well is fully penetrating. <br /> <br />The pumping rate is steady during tlines ~ and !p' <br /> <br />The residual effects of previous pumping are negligible. <br /> <br />. <br /> <br />.. <br /> <br />Studies underway by the writer and associates suggest that errors <br /> <br />due to fairly large departures from idealized conditions can be reduce~ <br /> <br />to tolerable proportions by using a model to determine the stream <br /> <br />depletion factor. Results from an electric-analog model of a stream- <br /> <br />aquifer system are being analyzed to determine the effects of complex <br /> <br />boundary conditions and areal variations in aquifer properties on <br /> <br />stream depletion factors. <br /> <br />.' <br /> <br />....0 <br />;.9 cP <br /> <br />7 <br />