Next: Data part, boundary conditions Up: Input file Previous: Data part, gravity Contents
groundflow_density rho
groundflow_seepage_geometry 0 -left_edge
The groundwater density 
as specified in groundflow_density is
.
On the total left edge there is air, so later we will prescribe in the boundary conditions
that the pore pressure is zero at the left edge.
However, we also need to be sure that the flux of water can only be directed outward
the dam at the left edge, and water cannot enter the dam at the left edge.
This is accomplished be using a seepage condition as specified in groundflow_seepage_geometry;
with such condition Tochnog will take care that water flux can only be outward, and not inward.