Rainwater Drainage System Houston, TX

Walk around the house after a heavy rain. Gullies under downspouts, bare soil or dying plants beside the slab, mulchMulchA layer of organic or mineral material spread over soil to hold moisture, moderate soil temperature and suppress weeds. In practice: In heavy rain, light mulch can float and wash onto paving. Placement and edging should account for water flow. washed across the walk, and puddles at the corners of the house all point to roof water with nowhere to go. Inside, look for musty smells along exterior walls or water at door thresholds.

Flexible black extensions lying on the lawn are another sign. They work until someone mows over them, they fill with leaves, or they drop water a few feet out on a yard that slopes back toward the house. If you are replacing gutters or adding a patio cover, that is the right time to plan the underground side as well.

Each downspout connects to a fitting at grade that drops into solid pipe buried in the yard. Lines from several downspouts join a larger collector that runs with steady fall to an outlet: a curb outlet at the street, a pop-up emitter in an area where water can spread and drain, or a sump basin with a pump on lots with no fall.

The key word is solid. Roof water arrives fast and in volume, so it needs smooth-wall pipe that carries it off without leaking into the soil along the way. Tying downspouts into a perforated 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. is a common shortcut that sends roof water right back into the ground near the house. Cleanouts at key points let the lines be flushed if debris gets past the gutters.

The roof and the yard get planned together, one downspout at a time.

1. 1Count and map every downspout, and estimate the roof area feeding each one.
2. 2Measure fall from each downspout to the planned outlet.
3. 3Plan line sizes, junctions, and cleanout locations on the drainage plan.
4. 4Call 811 and confirm HOA or city requirements for street outlets.
5. 5Trench, lay solid pipe with consistent fall, and install downspout connectors and cleanouts.
6. 6Set the outlet: curb core and outlet, pop-up emitter, or pump basin.
7. 7Run water through each connection, backfill in layers, and restore sod and beds.

We typically use solid SDR-35 or solid PVC for roof water. It resists crushing, holds slope, and can be jetted clean. Downspout adapters transition from the rectangular downspout to round pipe, and many systems include a debris filter or cleanout at the connection so leaves and pine needles can be cleared before they enter the line.

Outlet choice depends on the lot. Curb outlets work in most subdivisions with a street gutter. NDS pop-up emitters open under water pressure and close when flow stops, keeping critters and debris out, and they work best where ground falls away from them. A sump and pump is the answer for yards that sit lower than the street. Some homeowners also add a rain barrel at one downspout for garden use, with the overflow tied into the system.

Cost depends on the number of downspouts, total pipe length, the depth needed to hold fall, distance to the outlet, and whether lines must pass under walks or driveways. Boring under a sidewalk or cutting a driveway adds labor, and a pump basin adds equipment and electrical work.

Gutter condition matters too. Undersized or poorly pitched gutters overflow before water ever reaches the downspouts. If gutters are part of the problem, our $47 gutter measurement plan lays out a custom 6-inch seamless system for the home. For a starting range on the drainage side, use the ballpark price tool.

Shallow corrugated pipe crushed by foot traffic or mowers is the most common failure. Close behind: lines with a low belly where water sits, breeds mosquitoes, and fills with silt; pop-up emitters set uphill of the downspout so the line never empties; and long runs with no cleanout, so one clog shuts down the whole line.

We also see downspouts tied into a perforated French drain along the foundation, which floods the soil the drain was meant to dry. Roof water and groundwater should travel in separate lines, or meet only after the perforated section ends.

A rainwater drainage system is the link between the roof and the yard. It pairs naturally with seamless gutter installation, and with downspout rerouting when downspouts sit in the wrong place. Out in the yard, roof lines often share an outlet with catch basin installation at low spots. All of these connect within our drainage service in Houston.

We install custom-fit 6-inch seamless gutters and the drainage they feed, so one team plans the roof and yard sides together. NDS Certified drainage specialists design the system, a Home Scout visits every property before a proposal is written, and proposals are itemized under our price-what-we-quote guarantee. Drainage work is backed by our Drainage Performance Guarantee, and every job ends with a 72-hour post-completion walkthrough.