How Wide Is a Trench Drain

Finally, the effectiveness of a trench drainage system depends on its width. Common widths are 5″, 6″, 8″, and 12″.

How deep is trench drain?

French drain depth: 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.

Why do trench drains fail?

There are common reasons as to why and how a trench drain system can fail. Most often those reasons consist of poor maintenance, incorrect or improper drain system, grating, and/or installation for the application.