This document describes an example that has been used to verify the groundwater flow capabilities of PLAXIS. In this example a vertical cross section of an unconfined groundwater flow system in a homogeneous earth dam underlain by an impervious base is considered (see figure). Such a problem is commonly known as the Muskat problem where the free phreatic surface and the seepage face are unknown, leading thus to a set of nonlinear equations.

Used version:

• PLAXIS 2D: 2018.00 | 2016.01 | 2015.02
• PLAXIS 3D: 2018.00 | 2016.01 | AE.01