Discussion
One of the key assumptions made by Dupuit-Forchheimer about the flow behavior in the porous medium towards subsurface drains is
Answer: C
The assumption is horizontal streamlines.
The Dupuit-Forchheimer assumptions for unconfined flow say that for a gently sloping water table the streamlines are horizontal and the velocity is uniform over the depth, proportional to the slope of the water table. This reduces the problem to one dimension and underlies the Hooghoudt and related drain-spacing equations.
A homogeneous or isotropic medium and uniform recharge are assumptions of particular drainage formulas, but the defining Dupuit-Forchheimer assumption concerns the flow lines.
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