A case study in small-body aquifer testing

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1994-06

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The Ohio State University

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Determination of aquifer characteristics for small bodies requires careful evaluation of local geology. Many assumptions inherent in the use of the Theis equation and its variations may be violated. Limited areal extent, leakage, local heterogeneities, and the effects of dewatering may skew results. Results from a variety of analyses will illustrate these effects, and aid in proper evaluation of hydrologic properties. This study undertakes such an analysis. Various methods are used to determine transmissivity and storativity in a channel sand aquifer. These include time-drawdown, distance-drawdown, type curve matching, time recovery, and image well analyses. Values of transmissivity range from 3306 to 15,500 gpd/ft, and storativity ranges from 0.0009 to 0.005. Evaluation of the limits of each method in small-body analysis indicates that actual transmissivity ranges from 10,000 to 15,000 gpd/ft, and storativity is on the order of 10^-4.

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