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' s = displacement [L] <br /> st = displacement at time t [LI <br /> sQ = initial displacement to well [L] <br />' S = coefTiclent of storage of aquifer [dimensionless] <br /> S, = fracture skin [dimensionless] <br /> S5 = specific storage of aquifer or fractures to fissured system [L`] <br />' S; = specific storage of aquitard to leaky system or <br /> blocks In fissured system [i:'] <br /> S,� = 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 [TI <br /> ts = dimensionless nine wall respect to SS equal to Tt/SrZ [TI <br /> i = dimensionless time with respect to S, equal to Tt/S.,r [TI <br /> _ T = transmisslvity [I- T] <br /> v = vanable of integration <br /> Y, = Besse] function of second kind. zero order <br /> Y, = Bessel function of the second land first order <br />' z, = vertical distance above bottom of aquifer divided by <br /> initial saturated thickness of aquifer [L] <br /> z,c = vertical distance from bottom of aquifer to bottom of <br />' observation well perforations divided by initial saturated <br /> thicknessof aquifer [L] <br /> Z.- = vertical distance from bottom of aquifer to top of <br /> observation well perforations divtaed by initial saturated <br /> thickness of aquifer [LI <br />