The present study is aimed at modelling hillslope flows with emphasis
on subsurface storm-flows that involve macropores. The physical proces
ses connected with the runoff process on a hillslope are identified. T
he components which are considered in modelling the hillslope flow are
the nature of flows in the macropore and micropore domains, the spati
al and temporal characteristics of the macropore network, the interact
ion between the domains, and the initiation of flow in the macropores.
Both Horton and Dunne's variable source area generation mechanisms ar
e explicitly incorporated in the model. The dominant physical processe
s governing hillslope runoff are conceptualized in terms of parameters
which are derived from the physical properties of the soil, the natur
e of macropores, and hillslope geometry. The conceptualization of the
model is then used to examine infiltration and runoff production. This
helps to compute the development of the groundwater table, runoff hyd
rograph, and soil moisture profile.