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1. H. KLEINFELDER &ASSOCIA-rE5 <br /> Each of the type curves represent a different valtee of another <br /> dimensionless quantity,o�, where: <br /> r2s <br /> OL _ J <br /> c i <br /> and <br /> rs = inside radius of screen or open hole <br /> S = storage coefficient (dimensionless) i <br /> A usable set of these curves can be found in Lohman '1972). Papadopulos, <br /> Bredehoeft and Cooper ,i <br /> p 17j) increased the number of type curves for low � <br /> storage coefficients and greatly extended the utility of the method. I <br /> ;r,V i <br /> { <br /> Transmissivity can be computed by making a plot of the head ratios during <br /> recovery on the vertical. arithmetic scale versus time on the horizontal <br /> logarithmic scale and then matching the plot to one of the type curves. A <br /> match point is chosen at which TtIr2 = 1.0 orr the type curve and <br /> transmissivity is computed from: <br /> T = 1.0 r29 <br /> t <br /> j with the value of t taken from the data plot directly below the match <br /> point. Although the storage coefficient can be estimated from the <br /> relationship: <br /> S - r2c <br /> r r s <br /> it has questionable reliability because an order of magnitude difference <br /> j <br /> in storage coefficient can cause only slight shift in type-curve shape and <br /> 4 <br /> position. <br /> 53-87-443 16 <br />