Quick Answer: What Kind Of Rock For A French Drain?

What size gravel should I use for a French drain?

French drain gravel should be washed three quarter inch minimum and as large as 1 ½ ” crushed stone.

The upper 12 inches above the pipe shall be filled with native soil, to avoid having crushed stone over the perforated pipe that could damage the pipe..

Can you use river rock for drainage?

One of the many uses of river rock is to encourage drainage. Because the round stones do not fit as tightly together as other materials, water can flow through cracks between the stones. … This type of drain rock is also a great tool for xeriscaping, which is a style of gardening that requires very little irrigation.

Do holes go up or down in a French drain?

When you lay your PVC pipe, the rows of holes should always be facing the downward position. You want to keep the water level in your French drain as low as possible at all times, and you can’t achieve this if the holes are facing upwards or sideways.

Does French drain 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. You can construct the drain to accept water along its length, and disperse it underground.

Should I put landscape fabric under rocks?

Landscape fabric is really only good for one application. This is when you want to use stone (such as river stone or decomposed granite) instead of mulch. We’ve installed a good bit of river rock in some of our landscape jobs and we always use a geo-textile landscape fabric that allows some water penetration.

What materials do I need for a French drain?

To make your French drain last a long, long time you need to use these following items:Clean or washed gravel (not crushed limestone – it becomes cement like)Permeable landscape fabric (they kind water passes through)Rigid plastic perforated drain pipe (not flexible corrugated pipe – read why not)More items…

What drains better sand or gravel?

Water drains more quickly through gravel than it does through most types of soil, so puddles form less readily on gravel-covered pathways and borders than they do on soil surfaces.

Will water drain through pea gravel?

A Guide to Pea Gravel Drainage Systems Gravel is an ideal drainage solution for two primary reasons — weight and an impenetrable surface. The weight and coverage area provided by the material prevents erosion, and its solid, moisture-resistant design allows water to drain faster.

What do you put under pea gravel?

Because of its tendency to travel, pea gravel must be contained by some type of edging material, such as brick, stones, Bender Board, or metal edging (as shown above).

How do I get rid of a swampy yard?

What to do when your Backyard is a SwampDetermine the cause for poor drainage. You need to first determine what is causing water to accumulate in your yard before looking into potential solutions. … Till the soil. … Install a dry well. … Grow trees and shrubs. … Use drainage pipe. … Slope the yard away from your home.

What is the best aggregate for drainage?

Hard rocks such as granite or river gravel prove viable options for a French drain because they won’t break down over time as much as other rock varieties, such as sandstone and limestone.

What is the best fabric to use for a French drain?

polypropylene soil fabricQuality woven, pure polypropylene soil fabric has always been preferred for French drains, soil stabilization, ditches, and pipe-in-gravel, chamber and mound septic leach field systems.

Can you install a French drain without gravel?

Related To: 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.

What should I put down under River Rock?

For water conservation we recommend wood or other organic mulches over rock. In high erosion areas and waterways, we recommend installing a non-woven geotextile filter fabric installed with a layer of large river rock to slow down the water, hold the soil and prevent erosion.

Will river rock kill plants?

No Benefit to Plants: Rocks don’t aid plant growth or soil health. Messy pH: Most trees prefer acidic soil, but rocks create alkaline soil, which can hurt trees.

Where should a French drain end?

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.

What type of stone is best for drainage?

For the best drainage, look for coarse washed rock (gravel) that is screened, with a stone size of 1/2 to 3/4 inch. Smaller rock with fine particles could clog the holes of the drain pipe. Pea stone works, but the smooth stones settle together and don’t move as much water as coarse rock.

Can I use pea gravel for a 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. … It’s not going move water like the larger stone.

What is best for drainage?

Gravel is necessary for many landscape projects and not just beautiful rock gardens. Retaining walls and other features that require drainage make great use of large gravel to allow water to drain away faster than soil would. When you’re doing a DIY landscape project, it’s important to choose the right type of gravel.

What is the best pipe to use for underground drainage?

Plastic pipes are the preferred drainage pipe due to its versatility and availability. It is lightweight and easy to use for installation. There are several plastic drainage pipes to serve different purposes and they come in various diameter sizes to accommodate different amounts of water.

What is the difference between a French drain and a trench drain?

The main difference between the two is that French drains capture and remove groundwater while trench drains quickly remove surface water before it can saturate the ground.