Figure 1:Form of the weighting function that partitions evapotranspiration demand between the soil column and the groundwater system.

Two infiltration functions are incorporated in the model. Each of these functions are detailed below:

a) Available infiltration ≥ saturated soil conductivity

where q_in is the actual daily infiltration, q_avin is the available infiltration (m/day) and q ^$is the infiltration coefficient defined by

daily

and is based on the normalised minimum daily infiltration:

where K_sat is the saturated soil conductivity, n is the degree of infiltration asymmetry and q^* is defined by equation(2). The form of the infiltration coefficient as a function of the q^* and n is shown in Figure 2

b) Available infiltration < saturated soil conductivity

where q_in is the infiltration flux, q_avin is the available infiltration,