In the USA, this type of drain was named after Henry Flagg French, the man who invented it and wrote a book about farm drainage published in Massachusetts in 1859. French drains were initially used to reroute water from a sloping piece of land, to where the water could be used somewhere else.
What does the term French drain mean?
Definition of French drain : a drain consisting of an underground passage made by filling a trench with loose stones and covering with earth. — called also rubble drain.
What is the difference between a French drain and a trench drain?
Aside from what we’ve listed here, the difference between a French drain and a trench drain is that a French drain is used for water that is underground while a trench drain diverts excess water from a surface.
What is the difference between a French drain and a regular drain?
The Difference Between French Drains and Surface Drains. … You’ll find that the primary difference between the two systems is that French drains deal with water that gradually seeps below the ground, while surface drains redirect water that’s accumulating above ground.Where do French drains go?
Install a deep French drain. Also called a footing drain, it runs around the perimeter of the house at the footing level and intercepts water before it can enter your basement. It’s easy to install during house construction, but much more difficult and expensive to add later.
Why do French drains fail?
Over time, a French drain may become clogged. Tiny soil and clay granules slip through the pores of the landscape fabric and gradually build up inside the pipe. Another common cause of French drain clogs is root intrusion from grass, shrubs, and trees.
Where do French drains end?
Which End is Up? 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.
Do French drains 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.How much should a French drain cost per foot?
According to Fixr, the average French drain costs $4,500. An exterior drain located fairly close to the surface could cost as little as $1,000, or $25 per linear foot on average. Drains installed under your basement floor could cost $2,000 or more. Expect to pay $60 to $70 per linear foot for installation.
Are French drains illegal?This is where your main sewer pipe leads to the exterior sewer system. … BUT In most municipalities, it is illegal to discharge a French Drain System into a city sewer. Also, if the sewer backs up- your basement will flood with sewage.
Article first time published onWhich is better French drain or swale?
French drains have a more functional purpose, as they are intended to keep water away from the foundation. Swales, on the other hand, are often recommended by landscapers as a general-purpose drain. Swales are sometimes not an option in urban areas because they require large lots to shape properly.
How deep is a French 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.
Do plumbers do French drains?
If installed properly by a qualified plumber, a French drain can last for a very long time. In some circumstances, shallow French drains can be easy to install as a DIY project.
How much fall does a French drain need?
French drains need to have a slope of at least 1 percent, so the force of gravity will work for you. This means that the drain should slope down a total of at least one inch for every 10 feet of pipe.
Can you cover a French drain with dirt?
Can I cover a French drain with dirt? Because a French drain has holes throughout the pipe which allow it collect water, you should not install dirt on top of the drain pipe. Installing dirt will clog the pipe and the holes, rendering it useless.
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.
How much does a 50 foot French drain cost?
Linear FeetAverage Cost Internal French Drain (Materials Only)Average Cost External French Drain (Materials Only)50$1,000-$1,500$2,250-$3,000100$2,000-$3,000$4,500-$6,000150$3,000-$4,500$6,750-$9,000
How often replace French drain?
This is why most experts state that a French drain is not a long-term solution to a drainage problem: You have to dig it up and reinstall it every eight to 10 years.
Are French drains a good idea?
How Effective is a French Drain System? 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.
How long does it take to install French drain?
Completed Installation Time 6 – 8 Hours | A simple french drain installation can be done in one day by a team of professional landscapers barring any complications. 1 – 2 Days | If you rent a trencher and do the project yourself, you can expect it to take up most of your weekend.
Which is better sump pump or French drain?
If you have an excess of water in your basement, you may want to consider both a sump pump and French drain to waterproof your home. The French drain channels the water to the sump pump pit, which pumps the water out of the home much quicker that a pipe alone would do.
What is French drain basement?
A French drain (also called a weeping tile, drain tile, perimeter drain or sub-surface drain) is a common basement waterproofing solution. It’s a trench containing a perforated pipe that redirects surface water and groundwater away from the foundation.
Can I connect downspout to a French drain?
A French drain is actually a network of pipes laid in trenches dug beneath the ground through which water runoff can flow. This structure can be attached to your downspouts and will work seamlessly with your existing gutters.
Why is my yard holding water?
Standing water is usually caused by two common problems: poorly draining soil and low spots in the yard. Lawn thatch, the layer of thick dead leaves, roots, and stems between soil and grass, is another culprit. Heavy foot traffic can also compact soil, leading to poor drainage.
How do I drain standing water from my yard?
Simply dig a trench to direct the water toward the perimeter of your property, preferably near a storm drain or dry well, a shallow trench that has deep holes with rocks for drainage. When water is diverted to a dry well, the water can gradually drain into the surrounding soil.
Do French drains need to be cleaned?
French drains are quite effective at directing rainwater runoff away from your septic tank and foundation. However, proper maintenance is needed to keep them working correctly. You need to clean them at least once a year.
Should a French drain have standing water?
French drains are designed to collect rainwater and channel it downhill. If surface water is standing in low areas of the yard that are supposed to flow into your French drain, you have a drainage problem. If the low areas of your yard are as firm and dry as higher spots, then your French drain is working as expected.
How long does French drain 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.
What can I plant over a French drain?
French Drains as Watersheds Since your drain is not constantly running, use native plants like coneflowers, coreopsis and other plants that are at home with temperatures and precipitation patterns in your area.
How shallow can a French drain be?
Add a Layer of Topsoil to Drainage Ditch Dig a trench along the outside of your footing. The trench should be at least 2 feet wide, and can be as deep as 6 feet for a basement or as shallow as two feet for a slab-on-grade home.
Can you put a French drain under driveway?
When installing a French drain under a driveway or road, we use heavy duty structural corrugated drain pipe, not the stuff from the big box stores which can collapse if a truck drives over it. We also bury our French drains at least 12”-18” deep to avoid collapse.
