# Side yard drainage in Plano, TX

> Side yard drainage in Plano, TX: we restore the shallow swale between houses, clear what blocks it and add pipe only where it can't carry the water.

URL: https://clayplanodrainagecompany.com/side-yard-drainage/

Restoring or replacing the shallow swale between two houses so water from the back yard reaches the street instead of pooling along the fence and the slab.

Last Updated: November 11, 2026

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

## Water stuck between the houses?

On many Plano lots, the strip between two houses is how the back yard gets rid of water. When it stops working, water backs up along the fence, the AC pad and the slab, then sits in the back yard.

[Clay Plano Drainage Company](https://clayplanodrainagecompany.com/) restores side-yard drainage in Plano and nearby cities. We start with the shallow swale the lots were built with, find what’s blocking it, and add pipe only where the surface path can’t be brought back.

## What happens on the first visit

We measure the side yard from the back corner to the street, because a side yard fails at its high point, not where the water sits.

- **Depth and fall.** The swale’s depth at the property line, and its fall along the full length.
- **What’s in it.** Fences, gates, the AC pad, slabs, edging, beds and anything stored along the wall.
- **Both lots.** The swale straddles the line, so we look at the neighbor’s half too.
- **The plat.** Whether a drainage easement runs down the side yard.
- **Soil or surface.** A probe tells us whether the ground stays wet under a dry surface.

The written estimate says whether your fix is reshaping, pipe, or both, and which side of the line each part sits on.

## How a side yard is supposed to drain

Plano’s residential lot drainage detail draws a shallow swale centered on the property line. It is at least 0.25 feet deep, about three inches, and spreads across three feet on each side of the line.

Along its length the swale needs at least 1 percent slope, which works out to about six inches of fall over 50 feet. That isn’t much. A few seasons of mulch, sod laid over sod, or a slab edge can cancel it.

- Water from the back yard runs to the swale, then down it to the front.
- The swale carries water at the surface, with no pipe involved.
- A house drainage easement on the plat is privately maintained, which means by the owners, not the city.

The guide to [drainage easements in Plano](https://clayplanodrainagecompany.com/guide/drainage-easements-plano/) explains what the plat shows and how to read it.

## What blocks a side swale

When a side yard stops draining, look first for something sitting in the swale that arrived after the house was built.

| What’s there | Why it stops water |
| --- | --- |
| A fence with a bottom rail or rot board at ground level | Acts as a low dam across the flow |
| An AC pad or pool equipment pad | Fills the low line of the swale |
| A patio or walk slab extended to the fence | Raises the grade and cuts the side off |
| Beds, edging and mulch | Build up a little every year |
| New sod laid on old sod | Raises the swale floor |

In [Allen](https://clayplanodrainagecompany.com/service-areas/allen/), the city’s lot drainage details let a slab reach no more than 1 foot into the side swale. Rowlett doesn’t allow pool equipment in drainage swales. Plano asks owners to check the plat before building fences, walls or decks, since improvements in an easement can be cited and removed.

An AC pad and bed edging across the swale’s low line, with water held behind them.

## Reshape, pipe or both

Reshaping comes first because it costs less and can’t clog. Pipe comes in when something permanent, like an AC pad or a slab, has to stay in the swale.

### Reshaping the swale

We cut the swale back to depth and fall, starting at the street end and working toward the back, then set sod or rock to hold it. Where a fence crosses, we open a gap at the bottom or raise the lowest board so water can pass.

### Pipe with inlets

Where the swale can’t be cleared, a [catch basin](https://clayplanodrainagecompany.com/catch-basins/) at the back corner and sometimes one partway along feed a solid line to the front. The surface still needs a path for storms bigger than the pipe, so we keep the swale as shaped as the space allows.

### When the soil stays wet

If the probe finds water held in the ground long after rain, a short [French drain](https://clayplanodrainagecompany.com/french-drain-installation/) section under the swale collects it. Downspouts that empty into the side yard usually get their own [downspout lines](https://clayplanodrainagecompany.com/downspout-drainage/) so they stop loading the strip.

## Working with the neighbor

Because the swale sits on the property line, half of it is usually on the next lot, and their back yard’s water comes down the same strip.

Plano doesn’t permit lot-to-lot drainage unless an engineer approves it. Texas Water Code section 11.086 bars diverting natural flow in a way that damages another property. We plan each fix so both lots keep draining toward the street. The guide to [neighbor water runoff in Texas](https://clayplanodrainagecompany.com/guide/neighbor-water-runoff-texas/) covers the rules when water crosses the line.

## Keeping a side yard draining

A restored swale stays restored only if nothing moves back into it. The side yard is the easiest place on the lot to store things, and every item set in the swale is a small dam.

- **Keep beds and edging out** of the swale’s low line, and top up mulch without raising it.
- **Store nothing along the fence** in the swale: trash bins, firewood, pavers or a kayak rack all block flow.
- **Keep fence gaps open** when boards are replaced, and check them after a fence repair.
- **Plan replacements.** A new AC pad, generator pad or pool equipment should sit outside the swale.

Plano expects owners to keep drainage ditches on their property free of debris and growth, and a side swale works the same way. Some subdivisions also require HOA approval for fence and flatwork changes, so check before a project that touches the side yard.

## What side yard drainage costs

Our typical range for one side yard is $1,500 to $4,000. That covers reshaping the swale, or a solid line with one or two inlets, run to the outlet the lot was graded for; your written estimate sets the figure.

Length and width of the side yard, whether grading alone does it, fences, gates, the AC pad and utilities in the path, the neighbor’s grade and the restoration all move it.

- [Plano drainage rules](https://clayplanodrainagecompany.com/guide/plano-drainage-rules/) sums up the city’s standards for lots.
- If the back yard also tilts the wrong way, [yard grading](https://clayplanodrainagecompany.com/yard-grading/) and the side-yard fix get priced together.
- If water still pools after the side yard runs, the [standing water](https://clayplanodrainagecompany.com/standing-water-in-yard/) page explains what we check next.

## What's included

- A site visit that measures the swale's depth and fall from the back corner to the front
- A check of the plat for a drainage easement along the side yard
- A written estimate that says whether the fix is reshaping, pipe or both
- Texas811 locates and the route marked in white
- The swale cut back to depth and fall, with sod or rock to hold it
- Where the swale can't be restored, a solid line with one or two inlets to the front
- Openings planned at fences and gates so water can pass
- Water run down the side yard before we leave
- Sod put back and sprinkler heads reset to the new grade

## Reshape the swale, add pipe, or both?

|  | Reshape the swale | Pipe with inlets | Swale plus pipe |
| --- | --- | --- | --- |
| Fits when | The swale is clear but has filled in or flattened | A slab, AC pad or bed now sits in the swale's path | Heavy runoff from both lots, or soil that stays wet |
| What carries the water | The ground surface | Solid pipe below the surface | Pipe for ordinary rain, the swale for overflow |
| Disturbance | Shallow digging along the side yard | One narrow trench and inlet boxes | Both |
| Watch for | Edging and beds creeping back in | Inlets clogged by leaves and fence debris | Keeping the surface path open too |

## Related resources

- [Learn**Drainage easement rules in Plano: what can you build in one?** The strip along your side or back line may be yours on paper and reserved for water in practice. How to find it, what tends to block it, and how to plan around it.](https://clayplanodrainagecompany.com/guide/drainage-easements-plano/)
- [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/)

## 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

Freshly reshaped shallow swale of bare soil running between two houses toward the street

Wood fence with its bottom board raised a few inches above a grass swale so water can pass under

Small square grate in a Plano side yard beside an AC pad, a drain pipe in an open trench running along the house toward it

River rock lining a shaped swale along a narrow side yard, sloping toward the front lawn

## Side yard drainage: questions

### How far can a patio slab or fence go into a side swale?

It depends on the city and the plat. Allen's lot drainage details let a slab reach no more than 1 foot into the side swale, with a screening fence cantilevered over the easement. In Plano, check the plat first, because improvements in a drainage easement can be cited and removed.

### The swale is shared with my neighbor. Do they have to agree?

If the work crosses onto their side of the line, yes. The swale is centered on the property line, so half of it usually sits on their lot. Many fixes stay on your side, and the estimate says which side each part of the work is on.

### Why does the side yard flood when the back yard drains fine?

Because the side yard is where the back yard's water goes. A swale that has lost an inch or two of depth, or has a fence rail or AC pad across it, slows that water at exactly the narrowest point on the lot, so it backs up there first.

### Can I put rock down the side yard instead?

Rock can line a swale and stop it washing out, but gravel laid flat on clay doesn't drain anything by itself. The rock still needs to sit in a shaped channel with steady fall toward the front. Laid level, it just hides standing water.

### How do you work in a side yard only a few feet wide?

Mostly by hand and with small equipment that fits through the gate. We plan the route around the AC unit, gas meter and fence posts, and keep spoil on tarps outside the strip so the swale isn't buried while we work.

## Related services

- [Service**Yard grading** Reshaping the soil so the ground falls away from the slab and toward a swale or the street, set to measured slopes instead of guesswork.](https://clayplanodrainagecompany.com/yard-grading/)
- [Service**Downspout drainage** Buried solid pipe that takes roof water from each downspout past the beds and the slab to a pop-up emitter, an existing line or a permitted curb outlet.](https://clayplanodrainagecompany.com/downspout-drainage/)
- [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/)

## Get an estimate for side yard drainage

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