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D R A I N A G E S Y S T E M S
F R E N C H D R A I N S Y S T E M S:
A FRENCH DRAIN SYSTEM is a subsurface drain used to stop the permeation of sub-surface ground water.
FRENCH DRAINS are the most common and most effective method for removing excess ground water.
TYPICAL FRENCH DRAIN SYSTEM
TYPICAL FRENCH DRAIN SYSTEM USED TO PREVENT
SUBSURFACE WATER FROM ENTERING THE CRAWL SPACE AREA
FRENCH DRAINS are very effective when constructed directly against the length of a foundation or behind a retaining wall.
Construction involves the excavation of a trench to the bottom if the foundation, (usually 2 – 3 feet deep) dug along the entire length of the area to be protected. The trench is lined with a geotextile fabric and then a 4" perforated pipe, placed on a 4" bed of gravel, is laid at the bottom. The perforated pipe is connected to a solid 4" drain pipe and normally terminated at the street.
The trench is then back filled with gravel and the geotextile fabric, used to prevent the gravel pocket from clogging, is closed over the top. The gravel backfill stops just below the finished grade to allow landscaping or concrete work. (FRENCH DRAINS are not visible on the surface.)
Water migrating through the surrounding soil enters the gravel bed, falls to the bottom, is collected by the perforated pipe and flows by gravity to the solid 4" drain pipe to a termination point, usually the street.
TYPICAL FRENCH DRAIN SYSTEM USED TO PREVENT
RETAINING WALLS FROM SETTLING, LEANING AND/OR CRACKING
(ALSO PROTECTS WALL FACE FROM STAINS AND DISCOLORATION)
FRENCH DRAINS are very effective when used in conjunction with a CONCRETE SWALE and CATCH BASIN SYSTEM.
