WHAT IS A FRENCH DRAIN?

French 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. 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.

French drains are subsurface solutions consisting of a trench filled with gravel and a slotted or perforated pipe.

A layer of protective, permeable fabric is placed along the bottom and sides of the trench after it has been dug to prevent soil and root intrusion and on top before the topsoil is replaced.
Just like a trench drain, French drains siphon water downhill from a site, only this time that includes groundwater as well as surface water.

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