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' s = displacement [L] <br /> st = 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 <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 overiying aquifer <br /> [dimensionless] <br /> S" = coefficient of storage of aquitard underlying aquifer <br /> 1 [dimensionless] <br /> t = time since pumping began [T] <br /> t, = dimensionless time with respect to S, equal to Tt/Sr' [T] <br /> t, = dimensionless time with respect to S„ equal to Tt1SYr' [T] <br /> T = transmissiviry W /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 /> 1 zo = vertical distance above bottom of aquifer divided by <br /> initial saturated thicimess ofaquifer[L] <br /> z „ = vertical distance from bottom of aquifer to bottom of <br /> V observation well perforations divided by initial saturated <br /> micknessof aquifer [L] <br /> z-- = vertical distance from bottom of aquifer to top of <br /> observation well perforauons divided by initial saturated <br /> thickness of aquife- [L] <br />