Slug tests in fissured aquifers

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Abstract
A simple model of a slug test in a fissured aquifer has been studied in order to gain insight into the difficulties of interpreting data from such tests. The model is used to estimate the errors that would result from applying the standard type curve analysis to fissured aquifers. It is found that the derived aquifer transmissivity will always be overestimated, but by a factor which is unlikely to exceed 3. By contrast, the derived storage coefficient can be in error by a factor ranging from 10−6 to 105. The volume of the aquifer influenced by a slug test is investigated, and a simple formula for estimating the range of a test is suggested.