Almost every drainage call we get starts the same way: "there's water where there shouldn't be water." The fix isn't always the same, though, and the two most common solutions — regrading and French drains — solve different problems. Pick the wrong one and you've spent money without fixing anything. This guide covers how to tell them apart.
Why yards hold water in this region
The Greater Chattanooga area sits on a mix of clay-heavy soil, limestone bedrock close to the surface in places, and a lot of topography — ridges, valleys, and low pockets that weren't always graded correctly during original construction. Clay is the biggest factor: it absorbs water slowly and holds it, so a yard that looks fine after a light rain turns to standing water after a heavy one. Add a house and driveway footprint that concentrates roof and pavement runoff into a small area, and low spots that used to just be damp become genuinely wet.
Grading problems vs. drainage problems
These get confused constantly, and the fix is different for each.
A grading problem is when the ground itself doesn't slope away from the house or toward anywhere useful — water pools because there's nowhere for it to go. You'll see this as standing water in a flat low spot, water sitting against the foundation, or a yard that's soggy across a wide area rather than in one specific spot. The fix is regrading: reshaping the ground so it has a consistent fall away from the house and toward a discharge point, typically a minimum of 6 inches of fall over the first 10 feet from the foundation.
A drainage problem is when the grade is actually fine but water is coming from somewhere specific — a spring, a high water table, an uphill neighbor's runoff, or subsurface water moving through the soil. You'll see this as a wet spot that shows up even without rain, or water that reappears in the same specific location no matter how the surface grade looks. The fix here is a French drain: a gravel-filled trench with a perforated pipe that intercepts subsurface water and carries it to a discharge point before it reaches the surface.
How to tell which one you have
A simple test: after a rain, walk the yard once the surface water has mostly drained (24-48 hours later). If the low spot is still wet or actively producing water with no rain in the recent forecast, you likely have a subsurface source — French drain territory. If the spot only holds water during and immediately after rain, and dries out normally afterward, it's usually a surface grading issue.
Another tell: if water pools against the foundation itself, that's almost always a grading problem — the ground right around the house needs positive slope away from it, code minimum in most jurisdictions.
What each fix actually involves
Regrading means cutting and filling to re-establish proper slope, often paired with re-seeding or sodding the disturbed area. It's disruptive to the lawn short-term but permanent once done correctly, since it's changing the actual shape of the land.
French drains are more surgical — a trench dug along the water's path, lined with fabric, filled with gravel around a perforated pipe, and covered. They're less disruptive to the surrounding lawn but only solve the specific water source they're intercepting; a drain in the wrong spot doesn't help.
Many of our jobs end up being both: regrade the surface to get water moving in the right direction, then add a French drain to catch the subsurface source that regrading alone won't touch.
Rule of thumb
If your yard dries out after 24-48 hours and only floods during rain, start with grading. If it stays wet with no rain in the picture, you're dealing with a water source that grading won't fix — you need a French drain, and possibly need to trace where the water is actually coming from before digging.