Abstract
ABSTRACT A soil moisture balance model for estimating groundwater recharge in a sub-tropical climate in which rainfall is typically of short duration and high intensity is described. The model, which operates on a 200 s time base, estimates soil moisture deficits, runoff coefficients and recharge for individual storm events and event sequences. Modelled outputs are compared with field measurements of soil suction, runoff, observed and numerically-modelled piezometer responses. The sensitivity of the model to evapotranspiration rates, root constant, initial soil moisture deficit, infiltration indices and the rainfall data time base is investigated and discussed. Empiral and conceptual methods of estimating infiltration are considered and compared.
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