Retaining Wall French Drain Detail

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Retaining wall french drain detail.

The loose gravel and perforated tubing help facilitate that water movement. The purpose is to take water from wet areas and disperse it into dry areas. 1 2 m in height or with slopes or other surcharges above the wall will need a toe drain. The size of the gravel used can vary from pea gravel to larger pieces of river rock.

Although there are exceptions most retaining walls require gravel backfill soil compaction pipe or toe drains and weep holes. Large batter wall section pdf dwg. The exact depth of the. About 8 inches to 2 feet deep should be sufficient for many water diverting projects though related systems such as those built around foundations and sub ground living spaces as well as the bases of retaining walls may be deeper.

Today we re rebuilding a retaining wall that wasn t built correctly. Otherwise water moving down the hill will build up behind the wall and undermine it. The process of making sure that a retaining wall drains properly is relatively simple but it is not very flexible. If you re building a retaining wall add a french drain behind the first course of stones or blocks.

Block setback options 5 degree batter pdf dwg. Xl wall section pdf dwg. The toe drain and the wall rock is designed to remove incidental water from behind the wall and is not meant as primary drainage path for above or below grade water management. Alternating planter 5 degree batter wall section pdf dwg.

Check out this video for some simple instructions on installing a french drain behind an 18 to 24 tall retaining wall before it is backfilled with dirt. In all cases wall rock is located within the cores of the block and a minimum of 12 in. The pipe should rest on the same compacted gravel base or concrete footing that supports the wall. Together these four features will provide adequate drainage for most designs.

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Any reinforced wall or walls over 4 ft. If aggregate of different sizes is used smaller pieces usually go closer to the pipe while larger pieces sit closer to and on the. A french drain is a trench dug in the ground into which a perforated tube is placed and which is then filled with gravel or lose rocks.