A retaining wall is a drainage system
The visible wall is only one part of the system. Base preparation, backfill, drain rock, pipe, weep paths, and slope all influence whether the wall stays straight through heavy rain and dry spells.
Water pressure adds up quickly
When water gets trapped behind a wall, pressure builds and can push the wall forward. Proper drainage gives water a path out before it starts moving the structure.
Match the wall to the site
A short garden wall is not the same as a tall grade-retaining wall. Height, soil, slope, surcharge, and nearby structures should guide the material and reinforcement plan.
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