The formulation of suitable boundary conditions is a very crucial task when
modeling water infiltration into macroporous hill slopes. The processes of water infiltration
and exfiltration vary in space and time and depend on the flow on the surface as well as in the
subsurface. In this contribution we have purposed special system process dependent boundary
conditions can be formulated for a two-phase dual-permeability model to simulate infiltration
and exfiltration processes. The presented formulation analyses the saturation conditions of the
dual-permeability model (e.g. saturation) at the boundary nodes and adopts the boundary
conditions depending on the processes at the soil surface such as rainfall intensity. Using a
simplified macroporous hill slope and a heavy rainfall event we demonstrate the functionality
of our formulation
