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When predicting the impact on the hydrological environment by land development, the surface runoff and groundwater recharge rates are the most important quantities. The change in land use leads to an increase in the flood peaks and a decrease in the rainwater infiltration into the underground. In order to assess the effect of the alteration on the groundwater recharge rate in the weathered granite area, the response of the groundwater level is studied at several observation wells, which are linked with the quasithree dimensional groundwater flow. As a result, it is found that the maximum surface runoff coefficient, F∞, is the most affective parameter followed by the shape parameter, (r) 1/2, used in the surface runoff coefficient as a function of rainfall intensity. Besides, it is also found that a change in the ground surface elevation affects the soil water loss height R0, which is used in the recharge model. In conclusion, the present approach is useful for predicting the change in the hydrological processes of the land use alteration in the weathered granite area.

PARAMETERS OF THE GROUNDWATER RECHARGE MODEL AT THE WEATHERED GRANITE SHALLOW AQUIFER