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<br />Four assumptions are required for the solution of the line-sink <br />equations: <br />o All flow streamlines are perpendicular to the line, thus T(L) is <br />the transmissivity in this direction. <br />o The computational method is based on a succession of steady state <br />solutions, requiring the assumption that discharge to the sink <br />is independent of position along the sink. <br />o The potentiometric surface is parallel to the confined unit. <br />o The unit has zero dip angle. <br />M <br />LJ <br /> <br />Distance of influence from the sink for both confined and unconfined <br />conditions can be computed from equations 4, 5, and 5a with a computational <br />decision on the amount of the sink which has been excavated at the time of <br />interest. The confined and unconfined distances of influence, are calculated <br />by the program and used in the computation of new initial head values for the <br />ner,t panel. <br />The basic McWhorter equations were refined for the hydrogeologic conditions <br />existing in the La Plata permit area. These are discussed in the following <br />paFgraphs. <br />Line Sink with Recharge Flow t a sink influenced by a constant head recharge <br />boundary•is computed by equations 6a and 6b (McWhorter 1981). The basic line <br />sink equations are modified to include the effects of a conS'tant head boundary <br />2 <br />