How Deep Should an Underground Drainage Pipe Be?

eHow may earn compensation through affiliate links in this story. Learn more about our affiliate and product review process here.
Downspout drains often require drainage pipes to move water away from the building.

Underground drainage pipes are a simple way to drain areas that are prone to remaining wet long after any significant rainfall. Drainage pipes are typically placed around the perimeter of foundation to collect excess water, which is then connected to one or more drainage pipes that lead away from the home or lawn on a downward slope.

Advertisement

Drainage Ditch Depth

Video of the Day

A typical drainage ditch is 12 to 18 inches deep and 6 inches wide.

Video of the Day

Drain Pipe Placement

Drainage ditches can simply be filled with gravel, which allows water to flow more easily than normal soil. It is most effective to place a drainage pipe in the ditch at a depth of 12 to 18 inches and then fill the ditch with gravel.

Advertisement

Drain Pipe Slope

Maintaining a depth of 12 to 18 inches is best for drain pipes, but the depth of the pipe may vary in order to maintain a downward slope, which is critical for proper drain functioning.

Advertisement

references