GGU-2D-SSFLOW: Step 4: Define boundary conditions (Example 2)

To define boundary conditions go to the menu item "Boundary/(Potentials) In section" and trace around the three points (two at the bottom of the basin and the intersection of the water surface with the slope) on the left side of the system.

Enter a potential of 20 m AD and assign it to the points by clicking the "Define" button. Trace around the two nodes on the air side (base area) of the system and assign the points a potential of 15 m AD as already described.

Note on boundary conditions:
The case of an impermeable boundary is automatically taken into consideration by the finite-element method. Valid is, that all system boundaries or partial boundaries, which do not posses source or potential boundary conditions, are automatically impermeable. In finite-element theory, this type of boundary condition is also known as a natural boundary condition.