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Kansas Geological Survey, Open-file Report 93-46

An Assessment of the Nguyen and Pinder Method for Slug Test Analysis

by James J. Butler, Jr. and Zafar Hyder

KGS Open File Report 93-46
December 1993


The Nguyen and Pinder method is one of four techniques commonly used in the field for the analysis of response data from slug tests. Limited field research has raised questions about the reliability of the parameter estimates obtained using this method. A theoretical evaluation of this technique reveals that errors were made in the derivation of the analytical solution upon which the technique is based. simulation and field examples show that the errors result in parameter estimates that can differ from actual values by orders of magnitude. These findings indicate that the Nguyen and Pinder method should no longer be a tool in the repertoire of the field hydrogeologist. If data from a slug test performed in a partially penetrating well in a confined aquifer need to be analyzed, the best currently available method is that of Hvorslev.

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Kansas Geological Survey, Geohydrology
Placed online May 8, 2015; originally released Dec. 1993
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