Dupuit-forchheimer assumptions
From Glossary of Meteorology
Dupuit–Forchheimer assumptions
Simplifying approximation that water flow is horizontal and evenly distributed with depth below a water table.
The approximation is valid for mildly sloping water tables and for flow that is constrained to shallow depths.
Forchheimer, P. 1930. Hydraulik. 3d ed., Teubner, Leipzig, Berlin.