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Effects of Selected Time on Analysis Results in Step-Drawdown Tests  

Lee Jin-Yong (GeoGreen21 Co., Ltd.)
Song Sung-Ho (Rural Research Institute, KARICO)
Lee Kang-Kun (School of Earth and Environmental Sciences, Seoul National University)
Publication Information
Journal of Soil and Groundwater Environment / v.10, no.2, 2005 , pp. 59-65 More about this Journal
Abstract
Step-drawdown test has been generally conducted to evaluate productivity or efficiency of both aquifer and well. In general step-drawdown test, pumping with a low constant discharge rate is conducted in the first stage until the drawdown within the well stabilizes. And then the groundwater is pumped with a higher rate in the next step until the drawdown stabilizes once more. This process is repeated at least three times (steps), with the equal duration. In this paper we tried to review some critical problems related to the step-drawdown test, which were revealed in the process of field practices and analyses. The problems, referred in this paper are mainly associated with the incorrect conceptual approach for analysis and incomplete data collection in the field test.
Keywords
Step-drawdown test; Well loss; Aquifer loss; Productivity; Well efficiency; Pumping duration;
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