When the Snow Melts, the Water's Gotta Go Somewhere
Right about now—late March into April—is when I start seeing homeowners stand in their yards looking confused and a little worried. The snow's melting fast. The ground's still half-frozen. And suddenly there's standing water where there shouldn't be any, or worse, water creeping toward the foundation like it owns the place. I'll tell you what, this is the moment that separates people who stay ahead of water damage from people who end up with a flooded basement and a $15,000 bill from a remediation company.
I've been watching houses in the Pacific Northwest long enough to know: spring drainage problems don't fix themselves. That wet spot near your foundation corner? It'll be back next spring. And the spring after that. But here's the thing—you don't need to call anyone yet. Most homeowners can handle French drain installation or build a dry well themselves with a weekend and some basic tools.
First, Find the Trouble Spots
Before you start digging, you need to know where water's actually collecting. This is simpler than you'd think.
- Walk your perimeter after a heavy rain or during snowmelt. Look for standing water, soft spots in the soil, or areas where grass looks darker and stays wet longer than everywhere else.
- Check the grade around your foundation. Does the ground slope away from the house, or does it slope back toward it? Water follows gravity—if the slope points at your foundation, you've got a problem.
- Look at your gutters and downspouts. Do they drain away from the house? A 4-inch downspout dumping water 18 inches from your foundation is basically asking for trouble.
- Notice cracks or seeping in your basement or crawl space. If you're seeing moisture, that's your water table telling you it's higher than you thought.
A few summers back I watched a neighbor spend three weekends installing landscaping upgrades—fancy gravel, new plantings, the works—on the west side of his house. Come that fall, his basement smelled like a swamp. Turns out he'd created a little valley that funneled every drop straight toward the foundation. The hardscape drainage solutions he needed would've taken four hours to plan, but he'd skipped that step entirely.
Understanding Your Options: French Drains vs. Dry Wells
These aren't the same thing, though people mix them up all the time. Both work. They just solve different problems.
The French Drain
A French drain moves water away from trouble. You dig a trench (usually 2 to 3 feet deep, 18 inches wide) sloped slightly downhill, lay down perforated drainage pipe, and surround it with gravel. Water seeps down into that gravel, gets caught by the perforated pipe, and travels along the slope toward daylight—ideally 10 or more feet away from your foundation. It's called a French drain, but honestly I don't know why. I've never met a Frenchman who cared much about it one way or the other.
French drain installation works best when you've got a place for the water to actually go—a slope, a storm drain, a culvert, or just open ground downhill from your house.
The Dry Well
A dry well catches water and lets it sink straight down through soil layers. You dig a hole (3 to 4 feet deep, 3 to 5 feet wide), backfill it with gravel and perforated pipe or a pre-made dry well basin, and cap it. Water from your gutters or surface drainage runs into this hole and slowly percolates down. It's perfect if you don't have anywhere to drain to, or if your yard's relatively flat.
Listen, most garden centers will point you toward buying a plastic dry well basin—Hancor brand, or similar—and yeah, they work fine. But you're mostly paying for convenience and marketing. A hole lined with landscape fabric and backfilled properly with gravel will do the same job for half the price.
Installing a French Drain: The Step-by-Step
You'll need a shovel, a wheelbarrow, a level, perforated drainage pipe (4-inch PVC or ADS is standard), landscape fabric, and pea gravel or river rock. Budget a weekend and a sore back.
- Mark your line. Using spray paint or flour, mark a path from your wet spot downhill, away from the foundation. Aim for at least a 1% slope—that means 1 foot of drop for every 100 feet of distance. You don't need much, but you need something.
- Dig the trench. Aim for 2.5 to 3 feet deep, 18 inches wide. Deeper is fine if you hit rock; stop there. Keep the downhill end lower than the uphill end. Use your level as you go.
- Lay landscape fabric. Drape it down one side of the trench. This keeps soil from clogging your gravel layer.
- Add gravel base. Throw down 4 to 6 inches of pea gravel along the bottom.
- Lay the pipe. Perforated side down. You want the perforations facing the gravel, not the soil. Overlap joints by 6 inches, or use coupling sleeves.
- Cover the pipe. Add another 4 to 6 inches of gravel on top and around it, then fold the landscape fabric over.
- Top it off. Backfill with regular soil. Your trench can be flush with the ground or slightly sunken—either works.
Building a Dry Well: The Basics
This one's even simpler. Find your wet spot. Dig a hole straight down—3.5 to 4 feet deep is ideal, 3 to 5 feet across. Make sure the bottom isn't solid bedrock or clay that won't drain. If the hole fills with water and doesn't empty in a few hours, your soil's too dense and you'll need a French drain instead.
Line the hole with landscape fabric to keep sediment from settling into your gravel. Fill it with 4 to 6 inches of large river rock on the bottom, then 12 to 18 inches of perforated pipe or a pre-made dry well basin, surrounded by pea gravel. Cap it with landscape fabric and soil, maybe plant some ornamental grasses on top if you want it to disappear visually.
If you're routing your gutters into the dry well, run a 4-inch downspout or flex drain line into it. One downspout can handle a single dry well fine; more than that and you might overwhelm it during heavy rain.
Don't Forget the Grading Around Your Foundation
Now here's the thing—a French drain or dry well won't save you if the ground around your house is shaped wrong. Water finds the easiest path, and if that path points at your foundation, it'll get there eventually. Spend some time re-grading your yard so that ground slopes away from the house, at least for the first 4 to 6 feet out. Even a gentle slope—1 inch of drop per foot of distance—makes a difference.
This is where hardscape drainage solutions get bigger. Maybe you're adding a swale (a shallow, vegetated ditch) to guide water away. Maybe you're installing permeable paving instead of solid concrete. Maybe you're just raking the soil back and replanting. Whatever you do, make sure gravity's working for you, not against you.
Spring Is the Right Time
The ground's workable. Water's doing what it does in March and April so you can actually see where your problems are. By summer, everything dries out and you'll forget. Then October rolls around, the rains come back, and you're wondering why your basement's damp again. Do the work now while it's fresh in your mind and the soil's cooperative.
Foundation water damage prevention isn't glamorous. Nobody's going to throw you a party for installing a French drain. But neither are you going to spend five figures on structural repairs or mold remediation. Sometimes the best work is the stuff nobody notices—the kind that just keeps things working the way they should.