A French drain is one of the simplest ideas in excavation: a sloped, gravel-bedded pipe that collects water and carries it somewhere it can do no harm. It is also one of the easiest things to get wrong, because almost everything that decides whether it works is buried where you will never see it. When a drain fails a season or two after it went in, the cause is nearly always one of a handful of shortcuts taken underground.

The four reasons drains fail

The slope is wrong. Water only moves downhill, and a French drain needs a consistent fall along its whole length to keep water flowing toward the outlet. Eyeball it and you end up with low spots where water sits, silt collects, and the line slowly clogs. The slope has to be set deliberately and checked, not guessed.

There is no stone bedding. Pipe laid straight on dirt settles unevenly as the ground shifts, which ruins the slope you worked to set. Bedding the pipe in stone gives it a stable base that holds its grade and lets water move freely into the pipe instead of choking on packed soil.

The pipe is glued, not gasketed. Glued joints are cheaper and faster, but they are also where tree roots find their way in. Roots are relentless, and once they are inside a drain they fill it. Gasketed pipe resists root intrusion far better, which is why we use it even though it costs a little more.

There are no cleanouts. Every drain needs to be serviceable. Without cleanouts, the only way to deal with a partial clog is to dig the whole thing up. We place cleanouts roughly every hundred feet so the system can be flushed and maintained for the life of the property.

What a drain built to last looks like

When the owner installs a French drain, those four things are not optional add-ons, they are the job. The slope is set and checked. The pipe is bedded in stone. The joints are gasketed. The cleanouts go where you would actually need them. One of our customers described a project that connected seven downspouts, a yard drain and a sump line into hundreds of feet of pipe, tunneling under a sidewalk and around utilities, and said the attention to those details is why they will never have drainage problems again.

It is the same standard whether the job is a single drain over one wet spot or a full drainage system for a property that floods. The difference between a drain that lasts and one that fails is not luck, it is whether the person installing it cares about the parts nobody sees.

If you have water pooling in the yard, sitting against the foundation, or finding its way into the basement, the fix starts with figuring out where the water comes from and where it needs to go. That is the first thing the owner does on a site visit, before any trench is dug.

Common questions