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Section 780.21 (c) Continued. <br />Revised 11/20/80 <br />Stallman as described by Lohman (1972), pp. 41-43. Stallman's <br />equation for discharge from a confined aquifer in a channel drain <br />with constant drawdown is as follows: <br />Q = 2s ST <br />Tl t <br />Where: Q = discharge from both sides of the drain per <br />unit length of drain, in gallons per day. <br />s = drawdown of piezometric head at time zero, <br />constant in feet. <br />t = time since discharge began, in days. <br />S = storage coefficient, unitless. <br />T = transmissivity, in cubic feet per day per <br />foot. <br /> <br />780-112 bb <br />