What kind of rock do you use for a French drain? Use Natural 1-1/2" Round Rock for best drainage. Washed rock is ideal. Avoid small pea gravel as the spaces in between stone is smaller minimizing flow rates. Avoid Crushed Rock (Minus) that compacts and has "fines" that will clog pipe inlets.
Do you put gravel under French drain?
The old way of installing French drains is to do it without the gravel and the fabric. Without the gravel and the fabric, however, the drain can clog up with sand and soil over time.
Is pea gravel good for French drain?
Do NOT Use Pea Gravel, Pea Pebble, Pea Stone When Building a French Drain. When building a French drain, you want to use a coarse rock that has been screened and washed. The rock that you see in this French Drain is 3/4″ and larger. You end up with large voids that'll move far more water.
How much gravel do I need for a French drain pipe?
Cover the pipe with about 3 inches of gravel or crushed stone, but not enough to cross above ground level. Wrap the excess filter fabric over it for another layer of protection.
How deep should French drains be?
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.
Related faq for What Kind Of Rock Do You Use For A French Drain?
Does pea gravel hold water?
Pea gravel is often overlooked as mulch material around containers or garden plants: It suppresses weed growth, retains moisture, and doesn't decompose like organic mulch.
How do you calculate gravel for drainage?
Deduct the volume of the pipe from the volume of the trench. The result is the volume of gravel required to fill the drain. Gravel is sold in cubic feet or cubic yards, so round the value up to the nearest whole unit. One cubic yard of gravel is 27 cubic feet.
How do you calculate gravel for a trench?
Length in feet x Width in feet x Depth in feet (inches divided by 12). Take the total and divide by 21.6 (the amount of cubic feet in a ton). The final figure will be the estimated amount of tons required.
Is crushed gravel good for drainage?
4. If you have an area of your yard where the water doesn't drain the way you would like, add some crushed stone as a decorative feature. The stone will help the water drain and not puddle while providing some decoration.
Is #57 gravel good for drainage?
Crushed Stone #57
This type of gravel, made from machine-crushed stone, is also a popular choice for landscape design and for constructing French drains, as the size and shape of the rock fragments promotes proper drainage and prevents the gravel from locking together to form an impervious surface.
How do you end a French drain?
Can I cover a French drain with dirt?
Can you cover a French canal with land? The best way to install French drains is to use perforated drains that allow water to enter or exit through small openings along the pipe. Cover the pipe with at least 12 inches of washed gravel. Place a filter cloth on the gravel to prevent the soil from blocking the pipe.
How thick should pea gravel be?
Add pea gravel to a depth of about 2-1/2 inches. Use a garden rake to smooth high spots and fill low spots as you go. Remember, the border should be about 1/2 inch higher than the gravel to help keep the small stones in place.
Can you use landscape fabric for French drain?
The best type of fabric for a drainage project such as a drain field or french drain is non-woven geotextile landscape fabric. If you're project requires high strength and also good drainage then a high end combination woven fabric could be suitable for your application.