Optimizing Aquifer Parameters from Drawdowns in Large Diameter Wells
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VIEW THE REPLYPublication: Journal of Irrigation and Drainage Engineering
Volume 133, Issue 4
Abstract
An optimization method is proposed for estimating the storage coefficient and transmissivity of an aquifer from drawdowns in large diameter wells consequent to an unsteady pumping. The concept of an optimal time step size is propagated in the proposed method. The estimate of the aquifer parameters corresponding to the optimal time step size is termed final estimate. The estimates for any other time step size are not reliable. The proposed method can also take into account the residual drawdowns. The application of the method is illustrated using an example.
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References
Barker, J. A. (1991). “On the discrete kernel method for simulating pumping tests in large diameter wells.” J. Hydrol., 124(1–2), 177–183.
Papadopulos, I. S., and Cooper, H. H., Jr. (1967). “Drawdown in a well of large diameter.” Water Resour. Res., 3(1), 241–244.
Rushton, K. R., and Singh, V. S. (1987). “Pumping test analysis in large diameter wells with a seepage face by kernel function technique.” Ground Water, 25(1), 81–90.
Singh, S. K. (2000). “Simple method for confined-aquifer parameter estimation.” J. Irrig. Drain. Eng., 126(6), 404–407.
Singh, S. K. (2006). “Simplified kernel method for flow to large diameter wells.” J. Irrig. Drain. Eng., 132(1), 77–79.
Singh, V. S., and Gupta, C. P. (1986). “Hydrogeological parameter estimation from pump tests on a large diameter well.” J. Hydrol., 87(3/4), 223–232.
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Published In
Journal of Irrigation and Drainage Engineering
Volume 133 • Issue 4 • August 2007
Pages: 411 - 413
Copyright
© 2007 ASCE.
History
Received: Nov 16, 2005
Accepted: Nov 9, 2006
Published online: Aug 1, 2007
Published in print: Aug 2007
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