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<br />" <br /> <br />'.' <br /> <br />~ <br /> <br />DEFINITIONS AND ASSUMPTIONS <br /> <br />The units used are defined below, except those having to do only <br /> <br />with the mathematics, which are defined in the appendix: <br /> <br />r = the coefficient of transmissibility, [L2 IT]; <br /> <br />~ = the specific yield of the aquifer, dimensionless; <br /> <br />~ = time, during the pumping period, since pumping began, [T]; <br /> <br />1p = total time of pumping, [T]; <br />~i = time after cessation of pumping, [T]; <br /> <br />~ = the steady pumping rate, [L3/T]; <br /> <br />q = the rate of depletion of the stream, [L3 IT]; <br /> <br />!h. = the total volume pumped during time ~, [L3]; <br />!h.p = the total volume pumped, [L3]; <br /> <br />lL = the volume of stream depletion during time ~, ~!:' or lp + ~2:.' [e]; <br /> <br /> <br />A = the distance from the pumped well to the stream, [LJ; <br /> <br />sdf = the stream depletion factor, [T]. This term has not been <br /> <br />used previously. If the aquifer meets the assumptions listed in this <br /> <br />section, it equals ~S/T.which is the time required to make the term <br /> <br />tT/A2~ unity. In any aquifer, however complex, it is the time from <br /> <br />the beginning of steady pumping within which the volume of stream <br /> <br />depletion is 28 percent of the volume pumped. <br /> <br />1100 <br /> <br />5 <br /> <br />