# French drain installation in Plano, TX

> French drain installation in Plano, TX: we find the water's source and a legal outlet first, then build in fabric, washed stone and pipe. Get an estimate.

URL: https://clayplanodrainagecompany.com/french-drain-installation/

A trench of washed stone and pipe that collects water held in the soil and carries it to a legal outlet at the street side of the lot.

Last Updated: November 10, 2026

- **Catch:** downspouts, low spots, side swales
- **Carry:** solid pipe at a steady fall
- **Release:** to the street, never the neighbor

## Lawn still soggy two days after the rain?

That strip along the fence that never dries, or the slope that keeps seeping after a storm, is water held in the soil with nowhere to go. A French drain gives it a way out.

[Clay Plano Drainage Company](https://clayplanodrainagecompany.com/) plans and installs French drains in Plano and nearby cities. We start where the water starts. Before we draw a trench, we work out where the water comes from and where it can leave, because Plano lots are designed to drain to the street, never onto the lot next door.

> Not every wet yard needs one
>
> If a French drain isn’t the right fix for your yard, we tell you on the visit and show you what is.

## What happens on the first visit

We walk the yard with you and look at where water sits, where it comes from and where it could leave. Photos or a short video from the last storm help a lot.

- **Source.** We check downspouts, the neighbor’s grade, sprinkler zones and any paving that sheds onto the lawn.
- **Soil or surface.** We probe the soil to see whether the water is held in the ground or sitting on top, which decides whether a French drain fits at all.
- **Fall.** We measure the fall from the wet area to the street side of the lot, so the pipe can run downhill the whole way.
- **Outlet.** We look for a legal place to let the water out: a pop-up emitter in open front lawn, an existing line, or the curb where the city permits it.
- **What’s in the way.** Fences, gates, AC pads, beds, sprinkler lines and the width of the side yard all shape the route.

You get a written estimate that shows the route, the run lengths, the outlet and what gets put back afterward.

## Is a French drain the right fix for your yard?

A French drain is the right tool when water is in the soil: ground that stays soft after the surface has dried, or a slope that weeps for days. It is the wrong first answer for water running across the top.

Surface water moves faster than a trench can take it in. A low spot that fills during the storm usually needs a [catch basin](https://clayplanodrainagecompany.com/catch-basins/) or a small change in grade, and roof water needs [downspout lines](https://clayplanodrainagecompany.com/downspout-drainage/) in solid pipe.

| Points to a French drain | Points to something else |
| --- | --- |
| Soil stays wet a day or more after the surface dries | Water sheets across the lawn during the storm and is gone soon after |
| A band along a slope or fence line weeps after rain | A puddle forms in one low spot and sits on top |
| Water reaches the yard through the ground from higher land | Water pours off one roof corner |
| Grass is spongy over a defined strip | The patch is wet when it hasn’t rained at all |

A patch that stays wet through a dry week points to a sprinkler zone, not a drain. Many yards need two of these collectors on one line, and [yard drainage](https://clayplanodrainagecompany.com/yard-drainage/) covers systems that combine them.

## Water seeping downhill toward the house

A curtain drain is a French drain laid across a slope to catch groundwater before it reaches the lower yard or the house. It sits uphill of the wet area, not in it.

It suits a lot below a higher neighbor, or a yard that steps down toward the slab, where water moves sideways through the soil after storms. We set the trench across that flow, at the depth where the wet layer runs, and carry what it collects in solid pipe to the street side of the lot.

### What a curtain drain won’t fix

A curtain drain doesn’t change what a higher lot sends over the surface; grade or an inlet handles that. The guide to [water from a neighbor’s yard](https://clayplanodrainagecompany.com/guide/neighbor-water-runoff-texas/) covers what Texas law says about runoff between lots.

## What goes in the trench, and why clay changes it

A French drain is a trench of washed stone with perforated pipe inside, wrapped in filter fabric and connected to solid pipe that carries the water away. Each part has a job, and in Plano clay the details decide how long it keeps working.

- **Filter fabric** lines the trench and wraps the stone. Clay fines are what clog drains here; the fabric lets water through and keeps the fine particles out of the stone.
- **Washed drainage stone** holds open space around the pipe. Unwashed rock brings its own fines into the trench on day one.
- **Perforated pipe** runs only through the wet zone, where it gathers water that seeps into the stone.
- **Solid pipe** takes over between the wet zone and the outlet, so collected water doesn’t soak back into the ground on the way.
- **Cleanouts** sit where lines join or turn, so the line can be flushed with a hose later.

Fabric, washed stone and perforated pipe in the wet zone, before the fabric is folded over the top.

Houston Black, the clay across central, east and north Plano, takes in only about 0.03 inches of water an hour. In ground that slow the stone stores water while the clay releases it, so we size the stone zone to the wet area, not the pipe. The guide to [French drains in clay soil](https://clayplanodrainagecompany.com/guide/french-drains-in-clay-soil/) goes deeper.

## Where does the water go when it leaves?

Every French drain needs an exit, and the exit shapes the whole design. A drain with nowhere to send water just fills up and holds it.

Plano’s Stormwater Design Manual has house lots drain to the street, and lot-to-lot drainage is not permitted. So we plan the outlet toward the front of the lot:

- **A pop-up emitter** in open lawn on the street side, which opens when water flows and closes afterward.
- **An existing line** that already reaches the street, after we run water through it to prove it still works.
- **The curb.** Work in the public right-of-way, a curb outlet included, needs the city’s Engineering Permit for public infrastructure. We confirm what applies to your address before the route is final.

If the lot has no fall toward the street at all, gravity can’t do the job and a [yard sump and pump](https://clayplanodrainagecompany.com/sump-pump-drainage/) lifts the water instead. The guide to [where yard drain water can go](https://clayplanodrainagecompany.com/guide/where-can-yard-drain-water-go/) covers the outlet rules in full.

## Digging in far west Plano: chalk under the lawn

Out west, around the Dallas Parkway and Arbor Hills, the soil changes. Eddy gravelly clay loam and Stephen silty clay sit shallow over chalk, and the chalk can turn up inside trench depth.

That changes the dig more than the design. The top layer drains faster than the deep clay farther east, but rock in the trench means slower digging and sometimes a shallower route that still has to keep its fall. It is one reason two drains of the same length can price differently.

## How we install it

Once you approve the route, the work runs in the same order every time.

1. **Locates.** We call Texas811 so buried gas, power, water and cable lines get marked, and we mark our own route in white.
2. **Sod and soil.** We cut the sod in strips and set it aside, keep the trench narrow and pile the soil on tarps instead of the lawn.
3. **Silt control.** Silt controls keep loose soil out of the street and storm inlets while the trench is open.
4. **Build.** We shape the trench bottom to the measured fall, line it with fabric, then set stone, pipe, more stone and the fabric wrap.
5. **Water test.** Before any backfill, we run water through the whole system and watch it reach the outlet. A low spot gets fixed while the trench is still open.
6. **Restore.** We backfill, put the sod back and repair any sprinkler lines we crossed.
7. **Walk-through.** We show you the route, the cleanouts and the outlet, so you know what to keep clear.

The guide to [what happens during drainage installation](https://clayplanodrainagecompany.com/guide/what-happens-during-drainage-installation/) follows a day on site in more detail.

## What a French drain costs

Our typical range for a French drain is $25 to $60 per foot. That covers the trench, fabric, washed stone, perforated pipe and a solid run to an existing legal outlet; the site visit and written estimate set yours.

Depth and rock, the distance to the outlet, extra basins, a tight side yard and sprinkler lines in the path move a job within that range. The [French drain cost guide](https://clayplanodrainagecompany.com/guide/french-drain-cost-plano/) breaks it down, and the [cost estimator](https://clayplanodrainagecompany.com/tools/drainage-cost-estimator/) lets you try your own run lengths.

## Keeping it working after we leave

A French drain usually fails at its weakest point, which is the outlet. Keep the pop-up emitter or curb opening clear of clippings, mulch and leaves, and flush the line through a cleanout if water starts to slow.

Plano also expects owners to keep drainage ditches on their own property clear of debris and growth. If an older drain has quit, [drain repair and cleaning](https://clayplanodrainagecompany.com/drainage-repair/) starts by finding where it failed before anything is replaced, and the guide on [how long a French drain lasts](https://clayplanodrainagecompany.com/guide/how-long-does-a-french-drain-last/) covers what wears one out.

## What's included

- A site visit that maps where the water comes from, the fall across the lot and a legal outlet
- A written estimate showing the route, run lengths, outlet and restoration
- Texas811 locates, with our route marked in white before digging
- A narrow trench cut to the measured fall, with sod cut in strips and set aside
- Filter fabric, washed drainage stone and perforated pipe through the wet zone
- Solid pipe from the wet zone to a pop-up emitter, an existing line or a permitted curb outlet
- Cleanouts where lines join or turn, so the line can be flushed later
- Silt controls while the trench is open
- Water run through the whole system before backfill
- Sod put back, crossed sprinkler lines repaired, and a walk-through of the route, cleanouts and outlet

## French drain, curtain drain or catch basin?

|  | French drain | Curtain drain | Catch basin |
| --- | --- | --- | --- |
| The water it handles | Water held in the soil over a wet area | Groundwater moving downhill through the soil | Surface water pooling in a low spot |
| Where it sits | In the wet zone itself | Across the slope, uphill of the wet area | At the lowest point of the surface |
| How water gets in | Seeps through fabric and stone into perforated pipe | The same way, caught before it reaches the yard below | Runs in through a grate |
| Where the water goes | Solid pipe to the street side of the lot | Solid pipe to the street side of the lot | Solid pipe to the street side of the lot |
| The wrong choice when | Water runs across the surface during the storm | Water arrives over the surface, not through the soil | The wet area is wide and the water is in the ground |

## Related resources

- [Cost Guide**How much does a French drain cost in Plano?** What a foot of French drain pays for in Plano clay, what pushes a run toward the top of our range, and how a few common layouts add up.](https://clayplanodrainagecompany.com/guide/french-drain-cost-plano/)
- [Learn**Do French drains work in clay soil?** Plano's clay moves water at a crawl, which changes where a trench goes, how much stone it holds and what keeps it from silting up. What works here, and why some clay drains quit.](https://clayplanodrainagecompany.com/guide/french-drains-in-clay-soil/)
- [Decision Guide**Where do you drain a French drain in Plano?** The outlet decides the design, so we choose it first. Every option a Plano yard has, what each one needs, and how to pick when the lot is flat.](https://clayplanodrainagecompany.com/guide/where-can-yard-drain-water-go/)
- [Learn**How long does a French drain last?** A drain's life is set less by the pipe than by what gets into the stone and what blocks the outlet. The signs one is failing, the upkeep that keeps it going, and when to repair rather than rebuild.](https://clayplanodrainagecompany.com/guide/how-long-does-a-french-drain-last/)

## How we run a job

### Call

You tell us what you see, where it pools and when.

### Look

We walk the yard, measure the fall and find a legal outlet.

### Mark

We call Texas811 for locates and paint our route in white.

### Build

We trench to grade and set stone, fabric, pipe and outlet.

### Test

We run water through the system before any backfill.

### Restore

We put back sod and beds and repair crossed sprinkler lines.

## What this work looks like

Narrow trench cut across a Plano lawn, gray filter fabric laid along both edges ready to line it

Black perforated pipe laid on washed gray stone in a fabric-lined trench

Green pop-up emitter set flush in a front lawn a few yards from the street curb

Straight strip of fresh sod over a finished French drain line with a flush cleanout cap at one end

Before

After

## French drains: questions

### How deep does a French drain go in Plano clay?

Deep enough to reach the layer that stays wet and still fall steadily to the outlet, and the site visit measures both. In most of Plano the trench stays in clay the whole way down. In far west Plano, chalk can sit within trench depth, which can set how deep the route can run.

### Should the pipe be perforated all the way to the outlet?

No. Perforated pipe belongs only in the wet zone, where it collects water seeping into the stone. From there to the outlet we switch to solid pipe, so the water we just collected doesn't leak back into the soil along the way, especially along the house.

### How far apart should French drains be in a soggy lawn?

There is no single spacing. Slow clay gives up water to a trench only from the soil close to it, so a wide soggy area is better solved by finding why it is wet and where the water enters. Sometimes one well-placed line does it; sometimes grading or a basin is the real fix.

### Will a French drain take care of water from my roof?

Not well. A downspout can send a lot of water to one spot in a storm, and dumping it into a stone trench fills the trench before the soil water ever gets in. We pipe downspouts in their own solid lines, which can join the same outlet.

### Can I see the route before you start digging?

Yes. After Texas811 has marked the buried lines, we paint our route in white and walk it with you, so you can see where the trench, cleanouts and outlet will sit and raise anything about beds, trees or sprinkler heads before the sod is cut.

## Related services

- [Service**Yard drainage systems** One planned route that collects roof, surface and soil water from several parts of the yard and carries it in solid pipe to a legal outlet.](https://clayplanodrainagecompany.com/yard-drainage/)
- [Service**Catch basins** A grated box set at the lowest point of a lawn, bed edge or patio that takes in surface water and sends it through solid pipe to an outlet.](https://clayplanodrainagecompany.com/catch-basins/)
- [Service**Drain repair and cleaning** Finding why an existing French drain, yard drain or downspout line stopped working, then cleaning it, repairing the failed section or redesigning what never worked.](https://clayplanodrainagecompany.com/drainage-repair/)

## Get an estimate for French drains

Tell us where the water stands and when. We walk the yard, measure the fall and send a written estimate.