What Is a French Drain and How Does It Work?

This type of drain may be the solution to your waterlogged lawn

Close-up of a french drain in a house
Photo: Maryana / Adobe Stock
Close-up of a french drain in a house
Photo: Maryana / Adobe Stock
Highlights
  • A French drain is designed to redirect water away from your home and property.

  • You should hire a professional to install a French drain correctly due to its complex and labor-intensive nature.

  • A French drain can prevent pooling water and damage to your property.

  • French drains can last 30 to 40 years, with proper maintenance.

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If you have pooling water around your foundation or yard, you may want to consider installing a French drain. But what is a French drain exactly, and how does it work? This efficient drainage system is commonly used by homeowners who need to divert water away from houses or lawns to prevent flooding and damage to their property. Let’s dive into the details you need to know about French drains so you can decide if it’s the best drainage system for your yard.

Angi Tip

A french drain provides a sunken channel for water to disperse into the soil surrounding your home. Installing this type of system requires digging a trench and hooking up pipe connections, among other tasks, so it's best to hire a professional french drain installation company for this project.

Kaitlyn Pacheco
Content Editor, Angi

What Is a French Drain and How Does It Work?

French drain parts illustrated, including the landscaping fabric and perforated pipe

A French drain is a drainage system used to redirect water away from a specific area, such as a home’s foundation or lawn. It consists of a trench lined with filter fabric, a pipe, and rocks. The rocks allow the water to percolate into the ground, collect in the pipe, and disperse to another location known as the exit point.

French drains are dug on a sloped angle, which allows gravity to let the water flow freely and drain effectively. This outlet can be designed to disperse water in many different locations, such as a municipal drain, a rain barrel, a rain garden, a dry creek bed, or a catch basin. This stops water from accumulating and flooding the area which prevents damage to the foundation of a home or lawn.  

Pros and Cons of French Drains

Pros of French DrainsCons of French Drains
Efficient drainageImproper installation can cause serious issues
Versatile for many yard types and drainage issuesExpensive to install
Prevents mildew and mold growthMay need permit to install

While a French drain may be the solution to your soggy lawn, there are some pros and cons to consider before you start digging or hiring a pro. Let’s look at the perks of a French drain before we explore the disadvantages.

Pros of French Drains

Efficient drainage: A French drain is excellent for preventing pooling water and redirecting water away from your home or yard. 

Versatile: They can be installed in various locations, such as around the foundation of your house, patios, retaining walls, and other areas of your lawn.

Prevents mildew and mold growth: The drain prevents standing water from collecting near your home, which can be a habitat for mold and mildew.  

Cons of French Drains

Improper installation can cause issues: Installing a French drain improperly can prevent it from working correctly and lead to flooding and damage to your property.

Cost: A French drain can get costly depending on the size and complexity of the system. Installing a yard drainage system ranges between $2,200 to $6,800. Installing a French drain costs between $500 to $18,000.

Need permits to install: Another potential drawback of French drains is that large, complex yard systems require a permit to install. Building permits cost between $50 to $500 for plumbing-related permits, or $20 to $500 for outdoor permits. 

Signs Your Yard Needs a French Drain

So, how do you know that your yard needs a French drain? Well, there are some tell-tale signs to watch out for that will help you determine if you should install a French drain. Here are some common signs your yard isn’t draining adequately:

  • Pooling water: Standing water in your yard or around the foundation of your home is a sign of poor drainage.

  • Soggy lawn: A squishy waterlogged yard can be a sign that it is not draining properly and that you should install a French drain.

  • Water in basement or crawl space: If you have water seeping into your crawl space or basement it can also be a sign that there is a drainage problem. 

  • Soil erosion: Eroding soil in low-lying areas of your lawn or around your home can be caused by poor drainage as well.

If you are showing any of these signs then you should contact a French drain installation company near you to help determine if you should have one installed.

French Drain vs. Trench Drain

Another common drainage system is a trench drain. But what is the difference between a French drain and a trench drain, and which should you use? 

A trench drain is designed to divert surface water runoff. It is a long, narrow drain usually installed in the ground and covered with a grate to prevent debris from clogging it. Depending on their purpose, trench drains are made with various materials, such as polymer concrete, steel, and fiberglass. They are commonly installed in paved areas such as driveways, walkways, and parking lots.  

On the other hand, a French drain manages subsurface water flow and redirects it away from an area. So, which one you should install depends on your specific needs. It’s best to consult with a French drain professional to determine which drain will be the most beneficial for your property.

Should You Hire a Professional to Install a French Drain?

hands of the worker, in blue gloves, laid a plastic pipeline in an open trench in the ground
Photo: Kurgu128 / iStock / Getty Images Plus / Getty Images

In most cases, it’s best to hire a professional to install a French drain. While you may be able to install a simple French drain system yourself, you should seek the advice of a pro for complex drainage systems. If you do not install the drain properly, it can lead to a slew of problems and damage your foundation and yard. 

Although hiring a pro may be more costly upfront, it can save you money later by avoiding property damage if you install it incorrectly. Plus, you can rest easy knowing the drain will be properly installed and that it will work efficiently. 

Frequently Asked Questions

If properly maintained, a French drain can last 30 to 40 years. However, factors such as climate, types of materials used, and quality of installation determine its lifespan. It is essential to inspect and clean the drain every year to prolong its lifespan and keep it working efficiently.

French drains work effectively as long as they are properly installed with the correct materials and maintained. However, improper installation, using the wrong types of rocks, and not performing routine maintenance and cleaning can cause the drain to fail and not work effectively. That’s why it is best to have a professional French drain company install the drain for you. 

You shouldn’t use a French drain if you have nowhere for the water to go. For instance, maybe you don’t have a municipal drain nearby, and the only place the French drain could dump the excess water is a neighboring property or in a street without drainage. This just causes flooding problems for more people, so you’d want to consider a different draining solution for your property.

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