Abstract
Approximate solutions to the problem of groundwater flow in a composite dike aquifer system are presented for the case that a well in the dike is pumped at a constant rate. These solutions yield curve-fitting procedures to evaluate the drawdown behaviour of wells in the country rock. Procedures based on the authors' previous work are described. These contained both a distance-drawdown analysis and a time-drawdown analysis of observation wells in the country rock. They were tested on their validity with model and field tests. With common type-curve matching procedures early-time transient drawdown data can be analyzed to obtain the hydraulic diffusivity of the country rock. Together with the already published procedures to evaluate the drawdown behaviour of wells in the dike, the method allows a complete analysis of all the hydraulic characteristics of a composite dike-aquifer system. The methods described are illustrated by aquifer test data of a field test.
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