conrad

The above posts very been very helpful, as I also wish to model an excavation which will both
(a) be empty
(b) fill with water

However, I was wondering, can these both be done with the same model mesh?  My understanding of the seepage face boundary condition is that it would be applied at the edge of my model mesh, hence suggesting there should be a hole in the mesh to represent the excavation.  On the other hand, when the excavation is full of water then there shouldn't be a hole in the mesh.  Or is it possible to apply the seepage face internally inside the mesh?

Any insight would be most appreciated.