French drain diagram
3. Drainage Fabric
4. Soil Backfill
5. Ground Cover
A French drain, sometimes known as drain tile, is a trench covered with gravel or rock that redirects groundwater away from an area. French drains are common drainage systems primarily used to prevent ground water from penetrating or damaging building foundations. It also works well with wet soggy grounds and wet weather springs. Alternatively, the French drain technique may be used to distribute water which flows from the outlet of a typical septic tank. French drains are also used behind retaining walls to relieve ground water pressure.
French drain in herring bone pattern helps solve wet weather spring
French drain keeps the ground dry