# Where do you drain a French drain in Plano?

> Where to drain a French drain in Plano: pop-up emitters, existing lines, curb outlets and pumps compared, plus the outlets the rules and the clay rule out.

URL: https://clayplanodrainagecompany.com/guide/where-can-yard-drain-water-go/

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.

Last Updated: November 11, 2026

The short answer

Toward the street. In Plano, a French drain or any yard drain should empty at the street side of the lot: through a pop-up emitter in the front lawn, into an existing line proven to reach the street, or through a permitted curb outlet. Lots with no fall to the street use a pump basin.

Key takeaways

- Plano designs house lots to drain to the street, so that's where the outlet goes.
- The outlet has to sit lower than every point in the line, with steady fall in between.
- Curb outlets are in the public right-of-way and go through the city's Engineering Permit.
- A neighbor's lot, the sanitary sewer and a soak-away pit in clay aren't outlets.
- Plan an overflow path for storms bigger than the pipe can carry.

## Not sure where your drain’s water should go?

A drain is only as good as the place it empties. Pick the outlet first, then design the trench back from it, and most of the hard choices make themselves.

[Clay Plano Drainage Company](https://clayplanodrainagecompany.com/) plans the outlet first on every [French drain](https://clayplanodrainagecompany.com/french-drain-installation/) and yard drain we build in Plano. This guide compares every outlet a Plano yard can use and the ones it can’t.

## The Plano rule that sets the outlet

The city’s Stormwater Design Manual has house lots drain to the street. Lot-to-lot drainage is not permitted, and water can’t be diverted so it harms a neighbor’s or a downstream property.

That narrows the choice to outlets at the street side of the lot. The details of each are in the guide to [Plano’s drainage rules](https://clayplanodrainagecompany.com/guide/plano-drainage-rules/).

## Outlet options compared

Each outlet suits a different lot. This table shows what each one needs and where it fits.

| Outlet | How it works | Suits | Watch for |
| --- | --- | --- | --- |
| Pop-up emitter | A buried fitting at the end of solid pipe; its lid lifts to release water onto the lawn | Lots with open front lawn and fall toward the street | Needs open grass below it, not a bed or a dip |
| Existing line to the street | A tie-in to a drain line already in the ground | Lots with a line that still flows | Prove it with water first; an old line may be crushed or full |
| Curb outlet | Pipe carried under the parkway to an opening in the curb | Lots where an emitter has no room, or water must reach the gutter directly | Public right-of-way: city permit, and limits in some cities |
| Daylight to a swale | Pipe ends at a grade that leads to the street | Sloped lots with a working side swale | The swale must keep its depth and fall |
| Pump basin | A basin and pump lift water to an emitter or the curb | Flat or low lots with no fall to the street | Needs power and occasional checks |

Downspout lines and French drains can share an outlet. What matters is that every line feeding it stays solid from the point it stops collecting water.

## Outlets that don’t work here

Some outlets look handy and don’t fit a Plano lot. Here’s why each one is off the list.

- **The neighbor’s yard or the shared fence line.** Plano doesn’t permit lot-to-lot drainage, and Texas law bars diverting natural flow onto another property. See [neighbor runoff in Texas](https://clayplanodrainagecompany.com/guide/neighbor-water-runoff-texas/).
- **The sanitary sewer.** A sewer cleanout leads to wastewater treatment, not the storm system. Yard water stays out of it.
- **A soak-away pit.** Houston Black clay is in the slowest-draining soil group, so a pit fills and stays full. The guide to [dry wells in clay](https://clayplanodrainagecompany.com/guide/do-dry-wells-work-in-clay/) shows the numbers.
- **The end of the back yard.** A line that stops short of the street side puts the water back into the clay.

## Getting the outlet low enough

An outlet has to sit lower than every point in the line, and the pipe has to fall steadily all the way there. A single high spot leaves water standing in the pipe behind it.

On Plano’s flat lots, a few inches decide the plan. A run of 80 feet that falls 1% end to end drops just under 10 inches, so we measure the fall from each wet area to the outlet before choosing the route. When the numbers don’t work, there are four ways out:

- **Start shallower** at the wet end, if the water layer allows it.
- **Choose a lower outlet,** such as the curb instead of a mid-lawn emitter.
- **Shorten the run** by moving the outlet closer.
- **Lift the water** with a [yard sump and pump](https://clayplanodrainagecompany.com/sump-pump-drainage/) when there’s no fall at all.

## Curb outlets in Plano and nearby

A curb outlet crosses the parkway and opens into the street gutter. All of that is public right-of-way, so the city has a say before anything is cut.

In Plano, the work goes through the Engineering Permit for public infrastructure, and the approved permit stays on site. We arrange it as part of the job and confirm the curb details for the address with the city. Nearby cities add their own terms:

| City | Curb and right-of-way terms |
| --- | --- |
| [Prosper](https://clayplanodrainagecompany.com/service-areas/prosper/) | Curb coring only when surface flow can’t be handled; one core per lot, no more than 3 inches across, crossing the right-of-way straight; 2 feet clear of meters, laterals, mailboxes and lights |
| [Wylie](https://clayplanodrainagecompany.com/service-areas/wylie/) | Any curb or street section removed for private work is restored to standard and certified with the permit |
| [Murphy](https://clayplanodrainagecompany.com/service-areas/murphy/) | Flatwork that touches the driveway approach, curbs or drainage needs a utility permit as well |
| [Allen](https://clayplanodrainagecompany.com/service-areas/allen/) | Right-of-way permits go through the city’s online application, with an 811 ticket for locates |

## When the street can’t take it

Street drains are built for ordinary storms. Next door in Richardson, the city sizes its storm drains for storms with a 10 to 20% chance each year and lets streets fill to the curb in bigger ones.

During those storms, a curb outlet can’t empty until the street drains. That’s why we plan an overflow route across the surface for any system, so water the pipe can’t carry goes somewhere harmless.

### Creek-side lots

On lots along the Rowlett Creek and Oak Point corridors, soils are mapped as eroded silty clay on 3 to 5% slopes. Water leaving there needs a spread-out, protected landing so the outlet doesn’t cut a gully down the bank.

## Pricing the outlet

The outlet is part of every price, and a far or permitted one moves it. Our typical range for a French drain with a solid run to an existing legal outlet is $25 to $60 per foot; the site visit and written estimate set yours.

The [French drain cost guide](https://clayplanodrainagecompany.com/guide/french-drain-cost-plano/) shows what pushes a job up that range. To have the fall measured and an outlet chosen for your lot, call [(469) 551-8518](tel:+14695518518) or send photos through the form below.

## Questions about this guide

### Can I drain my yard into the sewer cleanout?

No. The sewer cleanout belongs to the sanitary sewer, which carries wastewater from the house to treatment. Yard water belongs in the storm system that runs to creeks. We route yard drains to an emitter in the lawn or to the street, never into a sewer line.

### Will a pop-up emitter leave a puddle in my front lawn?

It shouldn't, if it sits on open grass that falls toward the street. The emitter lid lifts when water arrives and drops when it stops, and the water spreads across the lawn on its way to the curb. One placed in a dip or a bed can pond, so placement matters.

### Can a French drain just end inside the back fence?

Not in a way that works. A drain that ends in the back yard puts the water back into the same slow clay it came out of, or sends it toward the lot behind. In Plano the line needs to carry water to the street side of the lot.

## Related service

- [Service**French drains** 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.](https://clayplanodrainagecompany.com/french-drain-installation/)

## More guides

- [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/)
- [Learn**What does Plano's drainage design manual mean for homeowners?** The city's Stormwater Design Manual is written for engineers, but a handful of its rules decide what you can do in your own yard. Here they are in plain words, with the numbers.](https://clayplanodrainagecompany.com/guide/plano-drainage-rules/)
- [Decision Guide**Do dry wells work in clay soil?** A dry well only works if the ground around it can take water away. In Plano's clay, that takes days per pit. The arithmetic, the one place it differs, and the outlets that work instead.](https://clayplanodrainagecompany.com/guide/do-dry-wells-work-in-clay/)
- [Learn**What does Texas law say about a neighbor's water runoff?** Natural runoff from a higher lot and water a neighbor has redirected are two different problems. How to tell them apart, write it down, and protect your yard without pushing water back.](https://clayplanodrainagecompany.com/guide/neighbor-water-runoff-texas/)

## Get an estimate for your yard

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