Install a French Drain to Stop Yard Flooding

Water pools against your foundation every spring. Your vegetable garden becomes a swamp after three days of rain. The side yard stays muddy long after the neighbors' yards have dried. These aren't minor annoyances—they're symptoms of drainage failure that will get worse and more expensive to fix if you wait. A French drain solves the problem by giving groundwater a fast path away from where you don't want it, using nothing more than gravity, gravel, and a perforated pipe. The system works because water always takes the path of least resistance. When you create a gravel-filled trench with pipe at the bottom, water moves through the loose stone far faster than it can seep through clay or compacted soil. Done right, a French drain is invisible, permanent, and handles water before it becomes a problem. The job takes a weekend, requires no special skills, and costs a fraction of what foundation repair or constant yard regrading would run.

1. Map Water Flow First. Walk your yard during or right after rain and identify where water collects and where it flows. Your drain needs to start at the problem area and slope continuously downward to a discharge point—a street gutter, drainage ditch, or dry well at least 10 feet from any structure. Mark the route with stakes, avoiding underground utilities. Call 811 for free utility marking at least three days before digging.
2. Dig with Consistent Slope. Dig a trench 12-18 inches deep and 8-12 inches wide along your marked route. Maintain a minimum slope of 1 inch drop per 8 feet of horizontal run—more slope is better. Keep the bottom smooth and consistent. Pile excavated soil on tarps for easier cleanup and potential reuse.
3. Line With Quality Fabric. Lay non-woven landscape fabric along the entire trench bottom and up both sides with at least 12 inches of excess on each side. This prevents soil from clogging the gravel over time while allowing water through. Overlap seams by 6 inches. Smooth out wrinkles that could create low spots.
4. Install Pipe Holes Down. Pour 2-3 inches of washed drain rock into the trench bottom. Lay 4-inch perforated drain pipe with holes facing DOWN along the entire run. The pipe should maintain the same slope as the trench. Connect sections with slip couplings. If your drain terminates above ground, attach an elbow and extend solid pipe to the discharge point.
5. Bury Pipe in Washed Stone. Fill the trench with washed drain rock until you're 3-5 inches from ground level, completely covering the pipe. Use 3/4-inch washed stone, not pea gravel or river rock. The gravel layer should maintain consistent depth along the entire run. Tamp lightly to settle.
6. Wrap Like a Burrito. Fold the excess landscape fabric from both sides over the top of the gravel, overlapping in the middle. This creates a burrito-wrap that keeps soil from infiltrating the stone. Secure with landscape staples or small rocks every few feet.
7. Backfill and Mound for Settling. Fill the remaining trench depth with excavated soil or topsoil, mounding slightly to account for settling. Tamp firmly. If running through lawn, replace sod or seed immediately. For garden beds, match existing soil and mulch. Water thoroughly to accelerate settling.
8. Verify Water Flows Clean. Run a hose at the drain's starting point for 15 minutes and verify water exits cleanly at the discharge. Check for any surface ponding along the route. If you find low spots, add soil. Let everything settle for two weeks, then top up any depressions that appear.