Hardscape & GradingQuestion 53 of 100
Weep holes or a drainage system behind a retaining wall serve what purpose?
a.To hold more water behind the wall
b.To add decorative accents
c.To increase soil pressure
d.To relieve hydrostatic pressure by letting water escape
Explanation
Weep holes and gravel drains allow water that collects behind a wall to drain out, relieving hydrostatic pressure that would otherwise push the wall over. Saturated soil greatly increases the load on a wall. Proper drainage is one of the most important factors in wall longevity.
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