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Standard system commonly used to control excessive rain water or flood water.Also can be used for draining swamps and wetlands.They are extremely effective at keeping land dry.I live in an area with a very high groundwater level, and my house is protected by these types of drains."A French drain, drain tile, perimeter drain or land drain is a trench covered with gravel or rock that redirects surface and groundwater away from an area. A French drain can have hollow pipes along the bottom (see images) to quickly vent water that seeps down through the upper gravel or rock. French drains are common drainage systems, primarily used to prevent ground and surface water from penetrating or damaging building foundations. Alternatively, the French drain technique may be used to distribute water, such as that which flows from the outlet of a typical septic tank sewage treatment system. French drains are also used behind retaining walls to relieve ground water pressure."http://en.wikipedia.org/wiki/French_drain
Standard system commonly used to control excessive rain water or flood water.Also can be used for draining swamps and wetlands.They are extremely effective at keeping land dry.I live in an area with a very high groundwater level, and my house is protected by these types of drains.
"A French drain, drain tile, perimeter drain or land drain is a trench covered with gravel or rock that redirects surface and groundwater away from an area. A French drain can have hollow pipes along the bottom (see images) to quickly vent water that seeps down through the upper gravel or rock. French drains are common drainage systems, primarily used to prevent ground and surface water from penetrating or damaging building foundations. Alternatively, the French drain technique may be used to distribute water, such as that which flows from the outlet of a typical septic tank sewage treatment system. French drains are also used behind retaining walls to relieve ground water pressure."
http://en.wikipedia.org/wiki/French_drain