Question: How To Build A French Drain In Yard?

How deep should a French drain be for yard?

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.

How do you build a French drain in your backyard?

Add a Layer of Topsoil to Drainage Ditch

  1. Dig a trench along the outside of your footing.
  2. Lay the pipe on the virgin soil.
  3. Cover the pipe with at least 12 inches of washed gravel.
  4. Lay filter fabric over the gravel to prevent any soil from clogging the pipe.

How much does it cost to put a French drain in your yard?

The average cost to install French drains range from $2,800 to $6,500. Costs can be as low as $2,000 for a 100 linear foot drain in an exterior location to as high as $10,000 for a 100 linear foot perimeter drain.

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Does a French drain need an outlet?

A properly designed French drain system does not require an outlet. The water will simply soak into the soil as it flows along the perforated pipe. In fact, a French drain doesn’t require an inlet on just one end either. You can construct the drain to accept water along its length, and disperse it underground.

What is the difference between a French drain and a trench drain?

The terms rhyme, they both involve trenches, and French drains aren’t really French. The defining difference is very simple, however: Trench drains are surface structures while French drains are subsurface ones. Let’s look at how they both work to keep water flowing offsite.

What size rock is best for French drain?

For the best drainage, look for coarse washed rock (gravel) that is screened, with a stone size of 1/2 to 3/4 inch. Smaller rock with fine particles could clog the holes of the drain pipe. Pea stone works, but the smooth stones settle together and don’t move as much water as coarse rock.

Can I install a French drain myself?

A French drain is a trench filled with a perforated pipe and gravel that allows water to drain naturally from your yard. Depending on the size of your yard and the scale of your drainage issue, you can purchase the pipes and equipment to create a French drain yourself.

Do French drains really work?

French drain systems are incredibly effective because, unlike typical surface drains, they collect water over the entire length of the drain as opposed to one dedicated area. The force of gravity helps to guide water along a reliably smooth path to a desired discharge point.

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How do I divert water in my yard?


  1. Dig a Swale. A swale is a shallow trench that redirects water to where it can be safely released.
  2. Construct a Dry Stream. Like swales, dry streams redirect water and prevent runoff damage.
  3. Grow A Rain Garden.
  4. Build a Berm.
  5. Route Water Into a Dry Well.
  6. Lay Pervious Paving.

How long will a French drain last?

How long do french drains last? Properly installed drains use advanced plastic sheeting called geotextile to protect the drainpipe from a blockage. French drains can last decades before needing maintenance. If your home requires a sump pump, a high-quality model will last around ten years before needing replacement.

Does homeowners insurance cover French drains?

Most standard home insurance (HO3) policies do not cover French drains unless you have a French drain rider. Like other pipelines, French drains direct surface water away from your home, and they are not part of your standard home insurance.

Does a French drain add value?

French drains remove the water before it has the chance to enter the basement, cutting back significantly on water damage and flooding that might have otherwise occurred. French drains can also add value to your home, which is a huge bonus if you know you are planning to put it on the market in the future.

Why do French drains fail?

When water seeps through soil to get to the French drain, it often brings along sediment into the drain, where it dumps the sediment in the drain on the gravel as it flows through the ditch. The sediment gradually builds up over time and slows the water flow through the French drain.

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Can I cover a French drain with dirt?

The simplest drain is a classic French drain, which is nothing more than a trench filled with coarse stone or gravel. The drain can be left open or, if aesthetics are a concern, can be covered with a couple of inches of topsoil and sod.

How far away from house should French drain be?

To get the correct distance to put in a French drain is 3 feet distant from the house, usually most homes. Apply to measure with tape and find the distance from the bottom of the ground where water pools. If space is too off from the base, the French drain will not gather the entire water.

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