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Sub-surface drain system A diagram of a standard French drain A French drain or weeping tile (also trench drain, filter drain, blind drain, debris drain, rock drain, drain tile, perimeter drain, land drain, French ditch, sub-surface drain, sub-soil drain, or agricultural drain) is a trench filled with gravel or rock, or both, consisting of a perforated pipe that reroutes surface water and groundwater away from an area.

Alternatively, French drains might be utilized to distribute water, such as a septic drain field at the outlet of a normal septic system sewage treatment system. French drains pipes are likewise used behind maintaining walls to relieve ground water pressure. History and building [edit] The earliest kinds of French drains were simple ditches that were pitched from a high area to a lower one and filled with gravel.

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Treasury Secretary explained and promoted them in Farm Drainage (1859 ). French's own drains pipes were made from sections of ordinary roof tile that were laid with a 18 in (0. 32 cm) gap in between the sections to admit water. Later on, specialised drain tiles were developed with perforations. To prevent obstructing, the size of the gravel differed from coarse in the center to fine on the outdoors and was chosen contingent on the gradation of the surrounding soil.

e., spaces between the particles of gravel and therefore blocking the drain. The later advancement of geotextiles significantly streamlined this technique. Keep Checking Back Here are dug manually or by a trencher. An inclination of 1 in 100 to 1 in 200 is normal. Lining the bottom of the ditch with clay or plastic pipeline increases the volume of water that can stream through the drain.

What is a French Drain? – Advice – UKDN Waterflow (LG)

How to Install a French Drain

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e., weeping tile surrounded by sand or gravel, and geotextile or landscaping fabric. Landscaping fabrics prevent migration of the drainage product and likewise avoid soil and roots from going into and obstructing the pipe. The perforated pipeline offers a minor subterranean volume of storage for water, yet the prime function is drainage of the area along the complete length of the pipe by means of its perforations and to discharge any surplus water at its terminus.