Discussion
The seepage velocity of groundwater exceeds the Darcy velocity because the flow passes through
Answer: B
Correct answer: only the pore space, not the whole cross-section
The Darcy velocity is the discharge divided by the whole area, grains included, but the water can only move through the voids, so the actual velocity in the pores is greater:
\[ v_s = \frac{v}{n} \]With a porosity of 0.25 the seepage velocity is four times the Darcy velocity. It is the seepage velocity that governs how quickly a contaminant travels, which is why the distinction matters.
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