French Drain Depth Uk

This low level distribution pipe will have no outfall.

French drain depth uk.

There is no hard and fast rule regarding the depth of a french drain. All of your drain pipe with one exception must slope slightly downhill. Further information and standard details of french drains with high level overflow pipes can be found in our french drain detail post. These french drains often also include a lower level perforated pipe to distribute the water along the length of the french drain trench.

Trenching tools will cut wider trenches which is ideal for more severe drainage issues and will cut the digging time in half. Traditionally the most common are up to 6 inches wide and 12 inches in depth. Note that i said the drain pipe must be sloped rather than the french drain. Often when installing new drainage sy.

The depth of the french drain depends on the purpose for using it and the location. That should be more than enough to ensure the drain can handle any moderate amount of rainfall. However most standard french drains are approximately 6 wide and 18 to 24 deep. About 8 inches to 2 feet deep should be sufficient for many water diverting projects though related systems such as those built around foundations and sub ground living spaces as well as the bases of retaining walls may be deeper.

When it comes to working out the best size for your french drain there is usually no need to make it larger than around two feet deep and one and a half feet across. However some situations may require trenches several feet deep and several feet wide. The width and depth of the drain you dig will depend on the severity of the drainage problem and the digging tool you re using. When installing a french drain next to a structure the trench must go no lower than the lowest foundations.

In this french drain tips video i cover some common mistakes made when installing drainage lines for gutter downspouts.