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r <br /> <br />R. G. OTTO & ASSOCIATES <br /> <br />stream flows are correspondingly high and dilution capecity is <br />greatest, will not influence water quality of Ralston (:reek is <br />supported by the various surface water measurements as discussed <br />in the following Section. <br />An extensive, theoretical consideration of the potenti~il for <br />percolation through the waste rock piles into the grou:id water and <br />subsequently into Ralston Creek has been provided by McDermid <br />1983. These authors conclude that, if any percolating water from <br />the waste rock piles reaches the water table, its flow would be a <br />function of the permeability of the alluvial soils and the <br />hydraulic head that exists at that moment. This situation is <br />described by Darcy's law which may be expressed as: <br />~ = Kh <br />At L <br />where: Q = The quantity of discharge to the stream <br />A = Unit cross-sectional surface area of stre<<m bank <br />t = Unit time in which the discharge is measured <br />K = The coefficient of permeability of the alluvial soils <br />h = The hydraulic head <br />L = The length of the alluvium in the direction <br />of ground water flow. <br />The term Q/At in this case is an estimate of the amount of ground <br />g~:~ water that enters the stream through a given cross-sectional area <br />of stream bank during a particular time. <br />