Diagnostic Curve for Confined Aquifer Parameters from Early Drawdowns
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VIEW THE REPLYPublication: Journal of Irrigation and Drainage Engineering
Volume 134, Issue 4
Abstract
A diagnostic curve of unimodal shape is developed for identifying the confined aquifer parameters from early drawdowns. A scaled well function is proposed for the diagnostic curve and computationally simple functions are developed for its accurate approximation. The diagnostic curve may be viewed as an alteration of the Theis’ curve or as the generalization of a previous approach proposed by the writer. Plotting the pumping test data in a convenient form and matching it to the diagnostic curve with a parallel shift of axes identify the aquifer parameters. The unimodal shape of the diagnostic curve facilitates matching and reduces the personal errors. The proposed method is simple, easy to apply, and yields accurate estimates of aquifer parameters from only early drawdowns, which would save considerable time and money involved in conducting a long-duration pumping test. The estimates obtained using the new method are as good as those obtained from much more complex methods. The new method does not require either the initial guess for the parameter values or repetitive evaluation of the well function.
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References
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Information
Published In
Journal of Irrigation and Drainage Engineering
Volume 134 • Issue 4 • August 2008
Pages: 515 - 520
Copyright
© 2008 ASCE.
History
Received: Oct 13, 2005
Accepted: Aug 15, 2006
Published online: Aug 1, 2008
Published in print: Aug 2008
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