One of the key assumptions made by Dupuit-Forchheimer about the flow behavior in the porous medium towards subsurface drains is
Options:
(A) homogeneous medium
(B) isotropic medium
(C) horizontal streamlines
(D) uniform recharge
Official Answer Key:
C
Step-by-Step Solution & Explanation
The Dupuit–Forchheimer approximation specifically assumes that (i) streamlines are essentially horizontal and (ii) the hydraulic gradient equals the slope of the free water surface.
Homogeneity, isotropy and uniform recharge are general assumptions common to most drainage formulations, not the distinguishing Dupuit–Forchheimer assumption.
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