![]() ![]() ![]() Later, specialised drain tiles were designed with perforations. French's own drains were made of sections of ordinary roofing tile that were laid with a 1⁄ 8 in (0.32 cm) gap in between the sections to admit water. Treasury Secretary described and popularized them in Farm Drainage (1859). These may have been invented in France but Henry Flagg French (1813–1885) of Concord, Massachusetts, a lawyer and Assistant U.S. ![]() The earliest forms of French drains were simple ditches that were pitched from a high area to a lower one and filled with gravel. French drains are also used behind retaining walls to relieve ground water pressure. Alternatively, French drains may be used to distribute water, such as a septic drain field at the outlet of a typical septic tank sewage treatment system. It was named during a time period when drainpipes were made from terracotta tiles.įrench drains are primarily used to prevent ground and surface water from penetrating or damaging building foundations and as an alternative to open ditches or storm sewers for streets and highways. When the pipe is draining, it "weeps", or exudes liquids. The perforated pipe is called a weeping tile (also called a drain tile or perimeter tile ). Sub-surface drainage system French drains to get the gutter water out from the retaining wall area A diagram of a traditional French drainĪ French drain (also called a weeping tile, trench drain, filter drain, blind drain, rubble 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, with or without a perforated pipe that redirects surface water and groundwater away from an area. ![]()
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