Well hydrograph and change in well level map analysis, associated with a small boulder clay catchment, detected a time lag response with the causal factors rainfall and potential evapotranspiration. The main purpose of this investigation was to test whether a suitable statistical method can detect this time lag and therefore translate this mechanism into quantitative terms. The analysis proved to be very successful despite some defects in the original data. The results confirm the general trends indicated in the earlier hydrograph and contour map analyses.

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