PART 12 Aquifer pumping tests - Dr. M. Zreda - University of Arizona

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Aquifer pumping tests 94 Curve matching method (Theis method) Can get T and S if Q is known and h is measured in time. Procedure: (1) Plot W(u) vs. 1/u on a log-log graph. (2) Plot test data (s vs. t) on the same size graph. (3) Overlay the graphs so that the curves are on top of each other. (4) Pick any point in the common area. (5) For this point, read off the following values: 1/u and W(u) for the first graph, and t and s from the second graph. (6) Calculate the transmissivity using T = Q --------W( u) 4πs (7) Calculate the storativity using 4Tt S r 2 = ------- u Hydrogeology, 431/531 - University of Arizona - Fall 2007 Dr. Marek Zreda
Aquifer pumping tests 95 Jacob logarithmic approximation For large t, u = r 2 S/4Tt becomes small. For u
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PART 12 Aquifer pumping tests - Dr. M. Zreda - University of Arizona

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