French Drain Depth Uk

These french drains often also include a lower level perforated pipe to distribute the water along the length of the french drain trench.

French drain depth uk.

The depth of the french drain depends on the purpose for using it and the location. 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. Recommended depths can range from about 18 inches to 6 feet. In this french drain tips video i cover some common mistakes made when installing drainage lines for gutter downspouts.

However some situations may require trenches several feet deep and several feet wide. A french drain pipe can help divert water away from your home s foundation patio or low lying areas to help prevent damage or pooling water. Trenching tools will cut wider trenches which is ideal for more severe drainage issues and will cut the digging time in half. When installing a french drain next to a structure the trench must go no lower than the lowest foundations.

Often when installing new drainage sy. Traditionally the most common are up to 6 inches wide and 12 inches in depth. This low level distribution pipe will have no outfall. 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. Note that i said the drain pipe must be sloped rather than the french drain. Usually 1 8 per foot is plenty for drainage this is the same as the commonly recommended 1 slope. Further information and standard details of french drains with high level overflow pipes can be found in our french drain detail post.

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.