A puddle that shows up after every rain, a soggy strip of lawn that never dries out, water pooling against the foundation: these are among the most common calls we get in Norwalk. And the most common mistake we see is someone installing a drain before figuring out where the water is coming from.
A French drain in the wrong spot is an expensive way to move a puddle three feet. Before you spend money, spend an afternoon on diagnosis. You need a garden hose, a string, a line level (a few dollars at any hardware store), a tape measure and a shovel.
Why the source matters
Standing water in a yard almost always comes from one of four places:
- Roof water. Gutters and downspouts dumping right at the foundation or onto a flat spot.
- Surface runoff. Water sheeting off a driveway, a patio, the street or a neighbor's higher lot.
- Poor grade. The ground is flat or slopes the wrong way, so water has nowhere to go.
- Groundwater or poor soil. Heavy clay, ledge or a high water table means water can't soak in, even when grading is fine.
Each has a different fix. A curtain drain won't help a clay problem, and a dry well won't help if the ground is already saturated. So figure out the source first.
Step 1: Watch it rain
This is the easiest step and the one people skip. During the next real rainstorm, put on a jacket and walk the property.
- Where does water come off the roof? Are the gutters overflowing? Where do the downspouts discharge?
- Where does water enter the yard: from the street, the driveway, the neighbor's lot, a slope above the house?
- Where does it collect, and which direction is it flowing when it gets there?
Take photos and short videos. They're very useful later, for you or a contractor.
Then note how long the puddles last. Water that drains within a few hours after heavy rain is normal. Water still standing a day or two after a storm is a problem, and mosquitoes will soon agree.
Step 2: Run the hose test
You don't have to wait for a storm to trace water.
- Downspouts: Run a hose into the gutter near each downspout for a few minutes. Watch where the water exits and where it travels. Many "yard drainage" problems turn out to be one downspout emptying onto a flat spot next to the patio. If a downspout goes into an underground pipe, run the hose and see whether the water comes out at the other end, or backs up. Buried downspout lines often get crushed or clogged with roots and leaves.
- Surface flow: Lay the hose at the top of a slope, or at the edge of the driveway, and let it run. Watch the path the water takes. It'll show you low spots and hidden channels you can't see on dry ground.
- Soak-in test: Dig a hole about a foot deep in the problem area. Fill it with water, let it drain, then fill it again and time how fast the level drops. If it drains less than about an inch per hour, the soil itself is the issue: heavy clay, compacted fill or a high water table. Drains that depend on water soaking in (like dry wells) won't work well there.
Step 3: Check the grade with a level
Your eye is bad at judging gentle slopes. A string and a line level are not.
- Drive a stake near the foundation and another about ten feet out into the yard.
- Tie a string between them, level it with the line level, and measure from the string down to the ground at each stake.
- The difference is your fall. Building codes generally call for the ground to drop at least 6 inches over the first 10 feet away from a house.
Repeat this at a few points around the house and across the problem area. You'll often find that the yard has settled over the years, patios or walkways were built too flat, or a garden bed was raised so that it now traps water against the foundation.
Matching the fix to the problem
Once you know the source, the solution usually becomes obvious:
- Roof water: Clean and resize gutters, extend downspouts well away from the house, or pipe them underground to daylight at a lower point.
- Surface runoff: A shallow grassed swale or a decorative dry creek bed can intercept and redirect water attractively. A channel drain across the base of a driveway catches water before it reaches the garage or yard.
- Poor grade: Regrading, adding soil to rebuild the slope away from the house, is often the most effective and least expensive fix.
- Groundwater or clay: A curtain (French) drain, a perforated pipe in a gravel trench wrapped in filter fabric, intercepts water moving through the soil and carries it away. It needs somewhere lower to go.
- Somewhere for water to go: A properly sized dry well works where soils drain reasonably. A rain garden, a planted depression with native, wet-tolerant plants, handles moderate runoff and looks great doing it.
A few Norwalk-specific notes
- Coastal and low-lying properties often have a high water table. Holes fill with groundwater instead of draining, so options that rely on infiltration are limited.
- Ledge is common across Fairfield County. Shallow bedrock can block drainage and will change what's practical to dig.
- Don't send your water to the neighbors. Redirecting runoff onto an adjoining property causes disputes and can create legal liability. Tying into a city storm drain generally requires permission, so check with the city first.
- Wetlands and watercourses trigger their own rules. If there's a stream, pond or wetland near the work, check with your town's wetlands office before digging.
When to call in help
The three-step check will answer most questions. If you're still seeing water, if it's getting into the basement, or if the fix involves regrading near the foundation or cutting through a patio, it's time for a professional. A Norwalk foreman can walk the property with you, look at your photos from Step 1, and recommend the smallest fix that actually solves the problem, free.