Why Gravel French Drains are Better with Corrugated pipe and Geo-textile Fabric

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Shared November 26, 2018


We're in Macomb Township, Michigan installing a French drain system.

When you're installing a French drain system, you want to run your French drain system in the lowest area. That's the collection area. In this case, we have a dwale, so we're in the center of the swale.

Now we're taking this French drain system to a storm drain catch basin. We went through the sidewall of that storm drain catch basin. You can't expect the water to come up and out of the system through the grate of the storm drain catch basin. This law of physics will not allow it to.  Water seeks to be level.  However, so upstream, yes, the grades higher over here than that storm drain catch basin grate, so some of the water would actually run out in over the storm drain catch basin grate into the storm drain catch basin. However, all of the, say first 50, 60 feet of the system would be always full of water, always holding water. So you want to go through the sidewall of the storm drain catch basin.

Now we never use a pipe with a sleeve or a sock on it. We use a pipe that has no rap, that's because we wrap the entire trench. The stone and pipe included all as one. The stone is going to try to migrate into the subsoil. The subsoil is going to try to migrate into the stone. So you need a soil separator. You want to wrap the entire system as one. This will preserve the system and this will make the system last for decades. Also, we put our pipe right on the, uh, this is a non-woven geotextile fabric. We lay it right on the bottom of the trench. The reason why we do that, we're 18 inches deep. That's where the tap is. We want to get all the water out of the French drain. We don't want water to lay in the bottom of the French drain to freeze, come wintertime when the frost goes to this depth and we can get away with it for a couple of reasons.

One, we're laying it on the fabric so we're not laying in the dirt too. This is not a pipe for building a septic field where you just have a couple of holes and align of have a couple of holes at the bottom. That pipe is designed to where you want to put stone down first, then put the pipe on it, and then more stone after. We have a pipe that has eight slots per valley, so we have eight inlets. They go around the pipe.  So, you can just see all the inlets. This pipe has eight slots per valley. There's so much inlet for this pipe. It's mad crazy from the sides to the top, so laying it on the bottom not affect its performance and because of the non-woven geotextile fabric, we're not gonna have a clog. We're not gonna, we're not laying it on dirt. We're building our system fully contained [...]

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French Drain Man – Michigan’s Yard Water Drainage Experts. Masters in the art of constructing contained French drain systems & curtain drain systems that and fix your yard drainage problems for years to come. Over 30 years’ experience in solving yard water drainage problems in Oakland, Macomb, Lapeer and St. Clair Counties.

French Drain Man / Sherwood Landscape Construction, LLC
122 S Rawles St
Romeo, MI 48065

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