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Most drainage problems start with ground that slopes the wrong way. Reshaping it is often the simplest fix, and every pipe in the yard depends on it.
Every drainage system starts with the shape of the ground. If the soil around a house slopes toward the slab, or a backyard has a dip with no way out, water will collect there no matter how many pipes are buried nearby. Rein Irving Drainage Company regrades yards so the surface itself moves water: away from the foundation first, then along swales toward an outlet the property is allowed to use.
Water runs downhill along the surface long before it soaks in, especially on Irving clay. In Las Colinas and much of north Irving, the USDA soil survey maps Ferris and Heiden clay, about half clay particles and extremely slow to absorb water. On ground like that, nearly every storm’s rain moves across the surface. Getting the slope right fixes most of it, and it makes every other part of a yard drainage system smaller, since pipes only have to handle what the grade cannot.
Grade usually goes wrong in a few predictable ways:
| Area | Typical target | Why |
|---|---|---|
| First 10 ft from the foundation | About 6 in of fall (roughly 5%) | The common code standard for moving water off the slab |
| Open lawn | At least 1 to 2% toward an outlet | Enough for water to keep moving on clay |
| Swale bottom | Steady fall, no flat spots | Flat sections hold water and turn soft |
| Paved areas | At least 0.5% | Paving sheds water faster than soil |
Local codes set their own minimums. Grand Prairie, for example, calls for at least 1 percent fall on earthen surfaces and 0.5 percent on paved ones. The slope guide explains how to check your own yard with a string line and a level.
A swale is a shallow, wide, grassed channel that carries water along a property line or across a yard toward the street, the alley or a lower point. Done well, it is barely visible: a gentle dip you can mow straight across. Where flow is fast or turf will not grow, a dry creek bed lines the channel with river rock to stop erosion. Both need a continuous fall and an outlet at the downhill end, and both are often cheaper to keep working than buried pipe.
Irving’s expansive clays respond to uneven wetting. Water standing at one wall keeps that side of the soil wetter than the rest, which is why pulling soil and mulch back from the slab and reshaping the first ten feet is one of the most useful foundation drainage steps. A few cautions apply:
Moving water is one thing; moving it onto someone else is another. Texas Water Code section 11.086 makes it unlawful to divert surface water in a way that damages another property. Grand Prairie bars concentrating runoff onto a neighboring lot without an easement or recorded release, and generally prohibits lot-to-lot surface drainage outside its estate zoning. A regrading plan respects the natural drainage pattern and sends water to an approved outlet, not over the fence. See neighbor water runoff in Texas.
Rules vary by city. Grand Prairie requires an earthwork permit when a grade or drainage pattern is altered. Dallas exempts single-family lots under two acres from a grading permit, but earthwork in a floodplain is reviewed. Southlake requires a drainage and grading plan for new houses and additions. University Park expects a plan before permit. For Irving addresses we confirm the requirement before work starts, and the permits guide collects the rules we have found.
Rein Irving Drainage Company plans and manages each job; installation is carried out by licensed and insured drainage contractors we work with.
Regrading varies too much for one honest range. The price follows the area being reshaped, how much soil has to be brought in or hauled off, access for equipment through gates and side yards, hand work near the slab, and how much sod and irrigation need to be restored. The regrading cost guide explains each driver, and the cost tool shows how they combine.
Some yards cannot be graded to an outlet: the lot is flat, the street is higher, or the low point is in the back with no alley. Those need a catch basin and pipe, or a sump where nothing lower exists. If water still stands after the grade is right, standing water in the yard walks through the other causes.
The common residential code standard is 6 inches of fall in the first 10 feet away from the foundation, about a 5 percent slope. Lawns farther out need less, but the ground should keep falling toward an outlet.
For surface water, often yes. A swale moves water that runs across the ground and costs less to maintain, while a French drain handles water moving through the soil. Many yards use a swale for surface flow and a short drain for one wet spot.
Filling a low spot moves water somewhere else, so it helps only if the new surface still falls toward an outlet. Piling soil against the house or against a fence often creates a new problem at the slab or at the neighbor's line.
A dry creek bed is a swale lined with river rock. It carries water in storms, resists erosion where flow is fast, and looks like a landscape feature the rest of the year. It still needs fall and an outlet like any swale.
Areas that are cut or filled lose their turf, so regraded ground is re-sodded or seeded. Beds and trees inside the work area are planned around before any soil moves, since burying tree roots can harm them.
Send a photo from the corner of the house looking out across the yard.
