Quick Answer: How Long Does A French Drain Last?

Does a French drain need to be sloped?

French drains need to have a slope of at least 1% so the force of gravity will work for you.

This means that the drain should slope down a total of at least 1-inch for every 10-feet of pipe..

Where should a French drain end?

The two ends of a French drain system are:The drain field, or high end, where excess ground water enters the drain pipes.The drain exit, or lowest point, where water leaves the system.

How much water can a French drain handle?

Generally, a French drain should drop at least one percent in depth for every 100 feet of length.

Do holes go up or down in a French drain?

When you lay your PVC pipe, the rows of holes should always be facing the downward position. You want to keep the water level in your French drain as low as possible at all times, and you can’t achieve this if the holes are facing upwards or sideways.

Can I install a French drain myself?

We recommend that you don’t install a French Drain yourself unless you’re already a lawn and garden professional, but here’s how it works: Dig a trench about two feet wide in your needed area and as much as six feet deep depending on the location (basement, retaining wall, or other areas, for example).

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. A 2–4% slope is adequate to quickly move water away from trouble areas. 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 do I know if my French drain is working?

The easiest way to tell if your French drain is operating properly is to look at your lawn or basement. If there’s water, chances are there could be a problem and your drain isn’t working correctly. This issue could be due to clogging.

How far should a foundation be from a French drain?

A French drain consists of buried perforated pipes slightly sloped to easily channel water flow, in this case, away from the house foundation. Start by digging a 2-foot-deep-by-18-inch-wide trench 2 feet or so away from the foundation at the highest point where the rear yard meets the foundation.

What is the best pipe to use for underground drainage?

High-Density Polyethylene (HDPE, often just “PE”) has become one of the most popular choices for underground service lines, thanks to its corrosion-resistance, durability, and competitive price. Some codes require that buried plastic lines under 2″ in diameter be PE (rather than PVC).

Should I use PVC or corrugated pipe for drainage?

While landscapers use “non-rigid corrugated NDS pipes,” we use drainage grade PVC pipe because it is more durable and longer-lasting, especially when buried under heavy materials like soil. The corrugated pipe is cheaper but not nearly as strong.

How deep should the trench be for a French drain?

About 8 inches to 2 feetFrench 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.

What size gravel 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 a French drain back up?

A French drain can help prevent standing water. A French drain is a pipe with holes throughout its length that is used to assist yard drainage. … When the drain becomes clogged, water will back up and not drain out of your yard.

Can you do a French drain without pipe?

Installing a French Drain Without a Pipe You don’t always need a base, though. If your soil drains well, you can simply dig the trench and cover the bottom with 3 to 4 inches of 3/4-inch drainage rock, depending on the depth of the trench.

What kind of stone do you use for a French drain?

The stone should be no less than ¾” and dense (we suggest Granite, or River Gravel) so it will allow good water flow. Lime Rock, although inexpensive, is a poor choice for a French Drain because it will begin to deteriorate over time and eventually begin to pack down and restrict flow.

Why do most yard drains fail?

One day that soil has all come together and there are no more air pockets. That’s the number one reason for yard drainage failures.

Do French drains really work?

Properly constructed, french drains will work well to transmit water from the pipe to the exit of the pipe; however, they are not very efficient in dewatering poorly drained soils. Adequate fall means at least 2 ft lower per 100 ft of pipe or 0.25 in. per foot of slope.

Do French drains need maintenance?

French drains need annual maintenance Despite the design’s best efforts, French drains get clogged by dirt, debris and silt. They do need to be cleaned out regularly – about once per year – to ensure that they continue to direct water away from the building’s foundation.