A simplification for the variable sorptivity infiltration equation of Poulovassilis et al. (1989) is proposed. The resulting equation has three parameters S <Subscript>x</Subscript>, c and K <Subscript>0</Subscript>. From these, S <Subscript>x</Subscript> and c are considered as fitting parameters and K <Subscript>0</Subscript> as a physical one. The new empirical infiltration equation...</subscript></subscript></subscript></subscript>