A finite-difference numerical model has been developed to assist in understanding the hydrogeology of a steep hillside in Hong Kong. The development testing and proving of this multi-layer model are described and discussed. Calibration of the model against observed piezometric responses during the 1980 wet season has demonstrated the importance of indirect recharge from bedrock in sustaining the system, and of evapotranspiration in assessing direct recharge from rainfall to the system. The use of this model in the estimation of extreme water levels as input for slope stability analysis problems is described. An analysis of model discretization errors is presented.

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