If you’re having problems with water pooling in the yard, the best thing you can do is install a French drain. People make several common mistakes when they install french drains, though. The most popular French Drain mistakes include:
- Not knowing zoning laws
- Ignoring how the water flows
- Ignoring the slope
- Not lining the drain
- Using the wrong gravel
- Bypassing the drainpipe
- Routing a downspout into the French drain
- Misdirecting pipe holes
In this article, we’ll discuss French drain mistakes in more detail and give suggestions on how to correct them, so they’re legal and work correctly.
Not knowing the zoning laws.
You should not install French drains on private or public property. Either scenario may result in legal action. Be sure to check local laws.
There may be drainage project restrictions in the neighborhood due to zoning or building codes. Therefore, it’s essential to double-check any plans with the local building or zoning authorities.
Make sure to dial 8-1-1 to find out the location of any underground utilities before you start the project. When you call, you’ll speak to a local call center that coordinates with local utility companies to mark underground lines, pipes, and cables with paint or flags so that you will know what’s below. Give them at least 72 hours before you dig to locate underground utilities.
Ignoring how the water flows.
You need to identify the parts of your property prone to flooding. You should figure out a French drain’s general flow before you begin planning. Water must flow away from your house.
It would help think about how exposed gravel might affect your yard, especially the view and recreation spaces. If you’re worried that your yard might be less safe for others, find a way to protect it, so others don’t get hurt.
Ignoring the slope.
French drains require a slope to function correctly. It should descend by 1% per foot. According to this rate, the French drain plunges 1 foot per 100 feet. Your property might have a steeper natural slope, which is fine. Just be aware that it will create more velocity. Steeper slopes can cause erosion in the discharge area. You should design the French drain slope appropriately.
To calculate the height difference between the beginning and end of a line, multiply the number of feet by the number of inches you plan to slope the drain. So, if you have 10 feet of pipe and want to do a half-inch slope, you need to ensure there are five inches difference in height between the beginning and the end of the drain.
No trench lining.
You also need to line the trench with non-woven geotextile fabric. Use one piece if possible. Otherwise, overlap each piece by at least twelve inches. However, remember to staple each end to the ground to secure it. Trim away any excess fabric from both ends later.
Also, be sure to overlap it according to the flow direction. This means the fabric along the trench’s high side must overlap on the low side.
Not using the right gravel.
Using the correct type of rock is essential for adequate permeability and drainage. Round natural stones are the best fill material.
This type of stone allows the material to flow more easily. When you use the right rock, you are less likely to have pieces break off and clog the French drain.
It would be best to try to source 1 ½ inch round rocks for the best results.
Not installing the drainpipe.
French drains are not often equipped with drainpipes because homeowners don’t install them. As a result, their drains can’t handle a lot of water.
A French drain diverts pooling surface water where you want it to go. However, without a drain pipe the French drain is less effective at slowing water.
A French drainpipe is typically four to six inches in diameter and perforated, which allows it to move water away from structures and prevent pooling.
Include the drainpipe the first time. If you don’t, eventually, you’ll realize that you need to dig the French drain up to fit the pipe later, possibly after a storm.
Routing a downspout into a French drain.
Many homeowners drain their gutter spouts directly into a French drain system. However, this kind of system can become overwhelmed during a heavy storm. Too much water flood the drainage system.
Instead, install a catch basin right before the drain field. Then tie the French drain into it. The basin also gives you a place to clean out leaves and debris that can clog your French drain.
Misdirection of pipe holes.
Sometimes, homeowners accidentally point the holes in their pipes away from their homes to filter the water as far as possible from their homes. However, water doesn’t work that way.
Instead, the pipe holes should face downward. Lower the French drain’s water level much as possible. You can only direct the pipe drain holes down. This can be one of the most popular french drain mistakes.
Why a Correctly Installed French Drain Is Important
You need to set up the French drain correctly. An improper installation can result in pooling, leading to significant difficulties. Do not make these common French drain installation mistakes.
Install it sloped, for example. That will let gravity take care of the water. You should also make sure the French drain does not have low spots or dips, as these will cause pooling, which you are attempting to prevent by installing a French drain.
Those are the French drain mistakes you need to avoid. Start by planning your project carefully and taking the proper precautions. Call 8-1-1 and let them mark utilities, pay attention to water flows, line your trench, install a drainpipe, use a catch basin, and put pipe holes in the correct place. If you do all that, your French drain will prevent water from pooling in your yard and avoid the associated health risks.