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s = displacement P [L] <br /> s, = displacement at time t [L] <br /> so = initial displacement in well [L] <br /> S = coefficient of storage of aquifer[dimensionless] <br /> Sr = fracture skin [dimensionless] <br /> S, = specific storage of aquifer or fractures in fissured system [I.:'] <br /> S; = specific storage of aquitard in leaky system or <br /> blocks in fissured system [L"'] <br />' Sw = wellbore skin [dimensionless] <br /> S� = specific yield of aquifer[dimensionless] <br />' S' = coefficient of storage of aquitard overlying aquifer <br /> [dimensionless] <br /> S" = coefficient of storage of aquitard underlying aquifer <br /> [dimensionless] <br /> t = time since pumping began [T] <br /> t, = dimensionless time with respect to SS equal to Tt/$r2 [T] <br /> t, = dimensionless time with respect to S, equal to Tt/Syr2 [T] <br /> T = transmissivity [L2 /T] <br /> v = van able of integration <br /> Y„ = Besse] function of second kind, zero order <br /> 10 Y, = Bessel function of the second kind, first order <br /> Zr) = vertical distance above bottom of aquifer divided by <br /> initial saturated thickness of aquifer [L] <br /> z,D = vertical distance from bottom of aquifer to bottom of <br /> observation well perforations divided by initial saturated <br /> thicknessof aquifer[L] <br /> z:D = vertical distance from bottom of aquifer to top of <br /> observation well perforations divided by initial saturated <br /> thickness of aquifer [L] <br /> i <br /> 1 <br />