How to Prepare Your Drainage System for North Texas Storm Season

North Texas delivers heavy rain fast. A 6-step pre-season checklist to make sure your drainage system is ready when the first major storm hits.

North Texas storm season runs roughly from March through October, with the heaviest rainfall typically occurring in April, May, and June. Collin County regularly receives convective storms that can drop 2 to 4 inches of rain in under two hours. A drainage system that has not been maintained through fall and winter can be working at reduced capacity when the first significant spring storm hits.

The checklist below takes under an hour to complete and addresses the six most common points of drainage system failure. Do this in late February or early March before storm season begins.

The Pre-Storm Season Checklist

Clear All Inlet Grates and Catch Basins

Leaves, mulch, and sediment accumulate on grated inlets over fall and winter. A blocked inlet grate reduces system capacity by as much as the blockage area. Pull each grate, remove debris from the basin below, and confirm the outlet pipe from the basin is clear. This 15-minute task can prevent your catch basin from performing at all during the first major storm.

Inspect and Clear the Outlet

Walk to every outlet point where your drainage system discharges: street curb opening, swale, or drainage easement. Check that the outlet pipe end is not covered by soil, vegetation, or debris. In some cases, weed growth at the curb face blocks the outlet opening entirely. The outlet is the most commonly overlooked point in the system and the most critical for gravity flow.

Flush the French Drain Pipe

Run a garden hose at full pressure into your cleanout access point or nearest inlet and time how long it takes for water to appear at the outlet. You should see a strong flow within 30 to 60 seconds for most residential french drain lengths. Sluggish or no outlet flow indicates partial blockage that warrants a professional hydro-jet flush before storm season.

Check Downspout Extensions and Connections

Gutters and downspouts that discharge against the foundation or into a low area are a significant contributor to Collin County drainage problems. Confirm that each downspout extension directs water at least 6 feet away from the foundation. If downspouts connect to underground drain pipes, flush those connections with a hose and confirm they are clear and discharging at the outlet.

Inspect the Foundation Perimeter Grade

The soil directly against your foundation can settle over winter, creating low spots that direct water toward the house. Walk the foundation perimeter and look for any areas where the soil has settled flat or toward the house. Fill these areas with clay-loam soil compacted firmly against the foundation and sloped away at a 2-percent grade. This takes a few minutes with a shovel and prevents water from pooling at the most sensitive location.

Check Sump Pump If You Have One

Pour a bucket of water into the sump basin and confirm the float switch activates and the pump runs. Check the discharge pipe outlet is clear. Confirm the battery backup (if installed) is charged. A sump pump that fails during a major storm is often the most expensive consequence of deferred maintenance. The pre-season test takes 5 minutes.

Drainage installation and preparation work in a Melissa TX yard

After a Major Storm: What to Check

Post-storm inspection tells you whether your system handled the event correctly and whether any adjustments are needed before the next one.

Note where water pooled and for how long

If water drained within 2 to 3 hours after rain stopped, the system is functioning. If it stood for 12 to 24 hours, the system was either overwhelmed or underperforming.

Check outlet for signs of high flow

Erosion or scour at the outlet end is normal during high-flow events. Check that the outlet pipe itself has not shifted or lifted.

Inspect foundation perimeter for evidence of splash or wave erosion

Heavy rain splashing off the foundation or against the perimeter can erode the grade you established before the season. Rebuild any eroded areas promptly before the next event.

Look for new low spots or soft areas in the yard

Saturated clay can become very soft during major events and may develop new depressions. These new low spots become future pooling locations if left unaddressed.

Common Questions

How often should I flush my french drain in North Texas?

Once per year before storm season is the minimum recommendation in Collin County given Blackland clay conditions. If your system shows reduced performance or if you had any tree root growth near the trench in the past year, twice yearly is better. The flush is straightforward: run a garden hose at full pressure into each cleanout or inlet and confirm water flows freely out the outlet end. If flow seems sluggish, a professional hydro-jet flush resolves most partial blockages before they become complete failures.

What do I do if my yard floods during a storm even though I have a drainage system?

First, wait for the storm to pass and then observe where water is pooling and for how long. If water drains within 2 to 4 hours after rain stops, the system is working but was overwhelmed by an extreme event: North Texas occasionally gets 3 to 5 inch rainfall in under an hour that exceeds any residential drainage design. If water consistently pools for 12 to 24 hours after moderate rain, the system capacity or function has degraded. Walk the outlet and check that it is clear and discharging freely. If the outlet is clear and water still stands, schedule a professional inspection.

Should I add a drainage system before buying a home in Melissa TX?

Drainage is worth specifically evaluating in any Collin County home purchase. During the showing or inspection, look for signs of drainage history: water stains on the foundation, eroded soil against the house, dead grass in low spots, or rusted metal downspout extensions. Ask the seller whether any drainage work has been done and request any permits or contractor documentation. A drainage inspection by a contractor costs $150 to $300 and can reveal whether existing systems are functioning or whether new installation will be needed after purchase.

Schedule a Pre-Season Drainage Check in Melissa TX

We inspect your entire drainage system before storm season, identify any issues, and quote any repairs before the first big storm hits. Free assessment, no obligation.

Free pre-season drainage inspection
French drain flush and outlet check included
Written quote for any needed repairs
Licensed and insured in Texas
Serving Melissa, Anna, Van Alstyne, and Collin County