How To Drainage Behind Retaining Wall

If youre building a retaining wall add a French drain behind the first course of stones or blocks.

How to drainage behind retaining wall. Backfill simply refers to the soil directly behind the wall. Thus the two walls and concrete base make a sealed box. Use a drain pipe to route water from behind the wall.

It is very important that backfill is at least 12 inches of clean crushed stone. No Stones Behind the Wall. Third since most retaining walls are impervious which means water cannot pass through the wall itself efficient drainage is crucial.

Perforated pipes can be installed behind the retaining wall allowing water to drain through the length of the wall. If there is any chance whatsoever of water or moisture building up to a point of putting any pressure against the wall then put a drainage system in. Backfill should not be garden soil clay or any other material that you may have.

Continue reading to learn about these four important features. Use drainage tubing behind the wall Slope the tubing from one end of the wall to the other or from the ends to the middle. In order to drain properly most retaining walls need soil compaction weep holes gravel backfill and pipe or toe drains.

You should add sawdust or other absorbent particles to the stones to help them soak up the soil. No Perforated Drain Pipe. Because behind the retaining wall it sounds like theres a lot of dirt sort of pressed right up against it.

Terracing systems although it might be tempting to allow the top one to flow onto the level of the lower ones it is a better idea to keep them separate connect them individually to a common storm water pipe running from the top level to the bottom. This will help provide drainage particularly during heavy rains. In order to provide proper drainage at least 12 inches of granular backfill gravel or a similar aggregate should be installed directly behind the wall.