Drainage Design and Planning Houston, TX

Some homeowners call us because water is already a problem. Others call before a big project because they know a new patio or addition will change how water moves. Both are good reasons to start with a plan.

• Water stands in the yard for more than a day after a storm.
• Soil has washed away from the slab, or water ponds against the foundation.
• Downspouts dump onto beds or walkways and splash mud on the brick.
• You are adding a patio, pool deck, driveway extension or room addition that will cover ground that used to absorb rain.
• A neighbor's yard sits higher than yours and sends sheet flow across the fence line.
• An older drain system exists but nobody knows where the pipes go or whether they still flow.

Houston's clay soils, such as the Beaumont and Lake Charles series, absorb very little water during a heavy storm and swell when saturated. So drainage here is mostly about moving water across and under the surface to a legal outlet, not waiting for it to soak in. The plan starts with elevations: where the high and low points are, how much fall exists from the house to the street or rear swaleSwaleA shallow, gently sloped channel in the ground, often grassed, that guides surface water toward an outlet. In practice: Side-yard swales between houses are common on Houston lots and are easily blocked by fences, beds or fill., and where the outlet will be.

Common building guidance calls for ground to fall about six inches in the first ten feet away from a foundation. Many Houston lots cannot deliver that across the whole yard, so the plan combines grading with collection. NDS catch basinsArea drainA surface inlet with a grate that collects water from a low spot and sends it into an underground pipe. sit at low points, channel drainsChannel drainA long, narrow grated drain set into paving to catch sheet flow along an edge, such as at a garage door or patio edge. catch sheet flow at patio and driveway edges, and solid pipe carries the water to the curb, a swale or a pop-up emitter in a spot that can take it.

Pipe choice matters. We specify smooth-wall pipe such as SDR-35 or solid PVC for runs that carry water, because it holds its slope and can be cleaned. Thin corrugated pipe sags in clay, traps silt and is hard to clear. Where groundwater needs to be intercepted, perforated pipe goes in washed gravel wrapped in filter fabric.

The plan is drawn from what the property actually does in rain, not from a template.

1. 1Free discovery call about where water collects and what you plan to build.
2. 2On-site visit by a Home Scout to read the grade, downspouts, outlets and soil. The $150 work scope fee is credited if you move forward.
3. 3Elevation shots across the lot to measure real fall to each possible outlet.
4. 4Drainage and grade plan showing slopes, catch basins, channel drains, pipe sizes and routes, and downspout tie-insDownspout connectionLinking roof downspouts into a buried pipe so roof water is carried away from the foundation instead of dumping beside it..
5. 5Coordination with the rest of the landscape design so drains sit in beds and borders, not in the middle of a seating area.
6. 6Itemized proposal, then installation with an 811 utility locate before any digging.

The right mix depends on where water comes from. Roof water is handled with downspout connections to solid pipe. Sheet flow across a patio or driveway is caught with a channel drain. Low spots in the lawn get catch basins or regrading. Water moving under the surface is intercepted with a French drainFrench drainA gravel-filled trench with a perforated pipe that collects water from the soil and carries it away. In practice: In heavy clay, a French drain mainly works by intercepting water near the surface. It must slope to a real outlet to be effective..

Outlets get as much attention as inlets. Many Houston lots discharge through the curb, which requires knowing the street's height. Others use a pop-up emitter in a lower part of the yard or tie into a rear swale. On bayou-adjacent lots and in subdivisions with drainage easementsEasementA strip of the property that someone else, often a utility or drainage district, has rights to use. Building permanent structures in an easement is usually restricted. In practice: Many Houston lots have a rear utility easement. Check the survey before placing a pergola or outdoor kitchen near the back fence., we design around what the easement allows and avoid pushing water onto a neighbor.

A drainage plan is part of our design package, and the build cost depends on what the plan calls for. The biggest drivers are total length of pipe, number of catch basins and channel drains, how deep the trenches must be to hold slope, distance to the outlet, regrading volume, and whether patios, driveways or walks must be cut to cross them.

Access and restoration also count: tight side yards, mature tree roots and replacing sod after trenching all affect price. Our ballpark price tool gives a realistic range before your consultation, and the written proposal itemizes every line.

The most common failure is a drain with no fall. Pipe that runs flat or uphill to a curb that sits higher than the yard just holds water. Close behind is corrugated pipe buried in clay with no fabric, which fills with silt in a few seasons. We also find downspouts tied into perforated French drain pipe, which sends roof water into the soil next to the foundation, the opposite of what you want.

Other problems come from sequence. Drains installed after a patio usually stop at its edge instead of passing under it, and grading done without a plan often creates a new low spot somewhere else.

A drainage plan connects to almost every outdoor project. Depending on your lot, it may call for French drain installation, catch basin installation, downspout rerouting or excavation and grading. For problem yards that need work right away, our full yard drainage solutions cover installation. Drainage design is the base layer of every project in our landscape design services.

Drainage is the reason Texas Urban Elements exists. Our team includes NDS Certified drainage specialists, and drainage work carries our Drainage Performance Guarantee. A Home Scout visits every property before a plan is drawn.

The same team that draws the plan installs the pipe, sets the basins and builds the patio on top, so the grades in the drawing are the grades in your yard. Proposals are itemized, and you pay the price we quote.