Hard rocks like washed river rock or granite chips are the ideal gravel for French drains. The gravel pieces should ideally average at least 1′′ wide to provide the best permeability for water to run along.
Add and compact 3 inches of coarse drainage gravel in the trench. Place the perforated pipe on top of the gravel in the trench.
A French drain needs to be surrounded by gravel in order to filter out silt and prevent clogging the drain pipe.
Bluestone is highly favored for French drains because of its larger stone size. This size difference allows for better absorption and drainage, ensuring that water is quickly diverted away from your property. The larger stones allow water to flow through, reducing the risk of clogging.
Dig a trench from the place in your yard that needs drainage to your chosen outlet. Check for underground utility lines and pipes before digging. The trench should be about 18 inches deep and 9 to 12 inches wide. least 1 percent, so the force of gravity will work for you.
Swales: A Natural Solution
They're a great option if you're looking for a more natural, eco-friendly alternative to French drains. A swale is typically lined with grass or vegetation that helps slow down and absorb water.
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.
Clay soil has poor permeability, meaning it doesn't allow water to pass through easily. In such cases, the effectiveness of a French drain may be limited as the water may struggle to drain away from the area efficiently. French drains may not be suitable for areas with high water tables.
It is the first choice for use in French drains, septic drainage fields and other types of drainage projects. You will also note that it is the preferred gravel for managing drainage around retaining walls, lining underground pipes, sewers and utility lines/cables.
An ideal backfill for a French Drain system is 1 ½' round rock.
Yes, you can use sand instead of gravel for your French drain when your project calls for it. It is less effective than gravel, but it can get the job done.
Clogging and Blockages
Clogging is one of the leading causes of French drain failure, often due to root intrusion or sediment build-up.
If you want to connect the French drainage system to the gutter downpipes from your home, consider using a 4-inch pipe rather than a 3-inch pipe. In heavy rain or bad weather, 3-inch pipes may not be able to cope with the amount of water that comes out of the downpipes flowing through them.
Without the gravel and the fabric, however, the drain can clog up with sand and soil over time. We're sorry, there seems to be an issue playing this video.
Installing a French drain costs $500 to $18,000, with a national average of $9,250. On average, you can expect to pay $10 to $100 per linear foot, or between $500 and $5,000 to have a 50-foot French drain installed.
If installing the drain involves diverting a stream or affecting a wetland, you likely need a permit to move forward. Generally, a small French drain on your property that doesn't change the flow of runoff entering and exiting your yard won't need a permit.
The stone should be no less than ¾” and dense (we suggest Granite, or River Gravel) so it will allow good water flow.
For example, most French drains need a ditch that's about a foot wide and 18” deep. For every foot you dig, you'll need to excavate one and a half cubic feet of soil.
57 works better if you have a lot of water issues, as long as you run a tamper over it to consolidate. Crusher run or base rock work well with soils that tend to move more. You will need to add allot of water when you have it graded out in order to maximize compaction.
An interior drainage system is an easier, more affordable option for waterproofing your basement. The WaterGuard Basement Waterproofing System is a non-clogging French drain alternative. Our interior drainage system captures water at the most common point of basement entry - the floor and the wall joint.
Things You Should Know
Add gravel to the bottom of the trench before laying down your drain pipe. Cover the drain pipe in gravel, then fill in the rest of the trench with the displaced dirt you dug up before.
For those seeking to install a french drain, as a professional landscaping company, Landscaping Brantford recommends installing french drains a minimum of 2 to 5 feet away from any foundation.
Contractors also prefer to work with a PVC French drain pipe. Despite its tough surface, it can easily be cut with a conventional handsaw. It's also easier to set the pipes at the proper slope and keep it in place.
Deep trench French drains are highly effective in clay soil environments. The deeper trenches allow for better water channeling, especially important in clay's slow-absorbing nature.