Hello,
When specifying the potential seepage face, the problem that remains how to define the zone of the seepage face. It is practically to choose the zone extended between the water level and the surface soil level or to select it arbitray as a guessed value ? In the last case can we specify a neumann boundary i.e, a zero horizontal gradient above the selected zone because of the existence of the unsaturated zone .
Best regards.
Yousfi