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IMAGE imgs/SMILE14.gif

b) Darcian flow recharge approximation

Based on Darcian flux at the base of any unsaturated soil column, Beven (1986) suggested that a suitable functional form for approximating vertical recharge flux can be expressed by:

IMAGE imgs/SMILE15.gif

where ais the effective vertical hydraulic gradient, K0 the saturated soil conductivity at the surface, f is a scaling parameter and z the local water table depth. The current model includes a modified TOPMODEL functional form of the recharge flux defined by

IMAGE imgs/SMILE16.gif

Infiltration Excess

Infiltration excess is accumulated from one day to the next. Potential evaporation is modified in the presence of ponded surface water according to the following:

qif the ponded surface water depth is less than potential evaporation,
the potential evaporation is reduced by an amount equal to the depth of
surface water and the depth of surface water is reduced to zero;

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