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s = displacement [L.] <br /> sL = displacement at time t [L] <br /> s, = 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 <br /> S; = specific storage of aquitard in leaky system or <br /> blocks in fissured system [L'] <br />' Sq, = wellbore skin [dimensionless] <br /> Sy = 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 /> is = dimensionless time with respect to S. equal to Tt/Sr` [T] <br /> t, = dimensionless time with respect to S, equal to Tt/SYr2 [T] <br /> _ T = transmissivity [V /T] <br /> Y - variable of integration <br /> Yo = Bessel function of second kind, zero order <br /> Y, = Bessel function of the second kind, first order <br /> zo = vertical distance above bottom of aquifer divided by <br /> initial saturated thickness of aquifer[L] <br /> Iz,a = vertical distance from bottom of aquifer to bottom of <br /> observation well perforations divided by initial saturated <br /> thicknessof aquifer [L] <br /> Z-1 = vertical distance from bottom of aquifer to top of <br /> observation well perforations divided by initial saturated <br /> thickness of aquifer [L] <br /> 1 <br />