Memphis summers hit drainage systems from two directions. The heat, 95°F with 85% humidity on a typical July afternoon, degrades seals and causes pipes to expand and settle. Then a storm rolls in and drops two inches in forty minutes. Systems that were marginal in spring don't always survive that.
Most failures we see in summer weren't caused by the storm. The storm just revealed a problem that had been building for months.
Before storm season peaks
The right time to go through your drainage system is May, before the worst of the summer heat and storms. By July it's harder to schedule service, and there's no buffer between you and the next rain event if something turns out to need work.
For French drain systems, the main thing to check is whether outlets are clear and flowing. Summer brings aggressive weed and vine growth that can block discharge points in a few weeks. Run a hose into the inlet and watch the outlet: water should flow within a minute or two. If it trickles or backs up, there's a blockage or the system is silted.
Catch basins are the most neglected part of most drainage setups. Through spring they collect leaf debris, mulch, sediment from the clay, and whatever the winter washed in. By June, a lot of them are half-full. Pull the grate, look inside, and pump or scoop out what's in there. Standing organic matter in summer heat also becomes a mosquito breeding site, so this isn't just a flow issue.
Gutters matter more in summer than most people expect. Summer storms are short and intense. A gutter that's 30% blocked by compressed spring debris will overflow on a 1-inch-per-hour rain even if it handled spring fine. Clean them in late May and again after any storm that drops a lot of debris.
Sump pump testing should happen before the season, not during it. Fill the pit with a garden hose until the float kicks the pump on, and listen for grinding or laboring. If you have a battery backup, test it by disconnecting main power. The middle of a summer thunderstorm is not when you want to find out the battery hasn't held a charge.
Pre-season checklist
- Run a flow test on French drain inlets and outlets
- Clean out catch basins and check grates for damage
- Clear gutters of spring debris; check for sags and loose hangers
- Test sump pump and battery backup
- Trim vegetation back from all drain components
What to watch during storms
Once storm season is active, walk your property during a regular summer shower. Not during lightning, just during an ordinary rain.
Watch where water ponds first, whether gutters overflow at any point, and where downspouts actually discharge. You'll learn more in twenty minutes of moderate rain than in any dry-day inspection. After significant storms, anything over an inch in an hour, check catch basins and drain inlets. Storms that move fast carry debris. A basin that normally fills gradually can get most of the way there in one event.
Vegetation
Summer growth in Memphis is relentless. Grass and weeds push into catch basin grates, vines creep over French drain outlets, and roots find any joint or crack they can reach. Ten minutes a month checking around drain components prevents the kind of slow blockage that only shows itself during a storm.
If you have trees near drainage lines, root intrusion is a warm-season problem specifically. Roots grow actively in summer heat. If you've had issues before, a camera inspection every few years is cheaper than the repair when a root finally finds its way through.
Warning signs that need a call
Some things aren't surface maintenance problems. Water backing up during an ordinary summer shower, not a freak event, usually means the system is undersized or blocked somewhere a grate cleaning won't reach.
Call a professional if you see:
- Water backing up during a moderate, ordinary rain
- Sump pump running continuously after rain stops
- Catch basins filling faster than they drain
- Standing water still there 24 hours after a storm
These need diagnosis. And summer is a reasonable time to schedule that work. Lead times on materials are shorter than fall, ground conditions are good for excavation, and if you've been watching a drainage problem for a year wondering when to deal with it, this is the window.
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