Install corrugated drainage pipe behind the first course of timbers and run the pipe to where the water can exit the area.
Does My Retaining Wall Need Drainage. Retaining walls with low height, say up to 2 m may not be provided with drainage like weep holes since the pore pressure on them due to water will be nominal. Do i need to bother with installing a drain pipe behind the wall, or is gravel backfill next to the wall and some landscape fabric.
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I have the foundation of two homes (very close to each other). Number one reason why retaining wall fail is drainage! Every joint between blocks is a drainage point.
A drain is normally placed behind a retaining wall to relieve hydrostatic pressure in the soil being retained.
That way, if one location gets squished or otherwise blocked, you have another route to take. Since there is a gap between the wall we just had the wall built by friends, who insist that we do not need a drain behind the wall, he left a 11/2 ft margin from the wall to the hillside so the. A drain is normally placed behind a retaining wall to relieve hydrostatic pressure in the soil being retained. If you are using perforated pipe, you need to provide more than one outfall location.
