Abstract
In case of a large-diameter well which penetrates an aquifer only partially, significant vertical flows may set in as a result of withdrawal from the well provided, of course, the vertical permeability below the well bottom is appreciable. A finite difference model of groundwater flow regime associated with a partially penetrating well in a hard rock terrain has been presented. Use of this model in the estimation of hydrogeological parameters in such a situation has been illustrated by a field example. The analysis of pump test data shows that parameter estimation will be in error if the vertical flows are neglected. The same model has also been used for prognosing the efficacy of a borewell in a large-diameter partially penetrating well to increase the yield.
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