Abstract
In Denmark, permission to abstract groundwater for field irrigation can be denied in case of a potential risk of reducing the stream flow below the recommended minimum. Often reduction in stream flow is unacceptable as it creates an unsuitable habitat for such fish as salmon. This paper presents an investigation of stream flow depletion when groundwater is abstracted for field irrigation. Analytical, statistical and numerical models have been tested and the results are compared with the actual stream flow depletion measured for 3 small streams in western Jutland. In general, the analytical models are not ideal for verifying the influence of existing wells on stream depletion, but they are suitable as a prognastic tool for estimating the influence of new wells on stream flow depletion. Findings also show that the Theis-Jenkins model which neglects resistences near the stream often over-estimates the stream flow depletion.
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