Kansas City drainage
A French drain is a trench lined with filter fabric, bedded with washed gravel and fitted with perforated pipe, laid on a steady fall to an outlet. Water that is sitting in the ground finds the gravel before it finds your foundation, and the pipe carries it away. In Kansas City clay, where rain soaks in slowly and then moves sideways, it is the fix for a yard that stays soft for days after a storm.
A French drain does not pull water out of the whole yard. It gives water that is already moving through the ground an easier path than the one it is on. Rain soaks into the topsoil, reaches the clay beneath, and then travels sideways along the top of it. A trench of washed gravel cut across that path is far more open than the clay around it, so the water drops into it, reaches the perforated pipe at the bottom, and runs along the pipe to wherever the outlet is. Everything about a drain that works comes down to three decisions: where the trench sits, how the pipe falls, and where it empties.
Clay is the reason French drains fail in this area. Its fine particles wash into gravel that is not protected and fill it within a few seasons. So every drain is wrapped: filter fabric lines the trench, the gravel goes in, the pipe sits on a bed of gravel with more over it, and the fabric folds over the top before the soil and sod go back. The pipe is laid on a steady fall, checked along its length, and the outlet is chosen before digging starts: daylight on a downhill slope, a pop-up emitter in the lawn, or a dry well where there is nowhere lower to go.
If the water is running across the surface, a drain under the lawn only catches part of it. That is a grading problem first. If the water is coming up through the basement floor, the drain belongs at footing depth or inside, which is interior drain tile. A yard that stays soft for days, a strip along a fence line that never dries, or a hillside seep that runs across a patio are the cases a French drain is built for.
Common runs are along the uphill side of a house on a sloped Shawnee or Lee's Summit lot, across the back of a yard where the neighbour's water arrives, and down the side yard between two houses in Olathe and south Overland Park subdivisions, where builder grading sends water from both roofs into the same narrow strip.
How long does it take? Most residential French drains are one to two days: locates first, then dig, fabric, gravel, pipe, backfill and sod. Long perimeter runs or hand-dug access take longer.
These often come up on the same property, and can be planned in the same visit:
Reshaping the soil so surface water runs away from the foundation instead of back toward it.
How it works →Solid pipe underground from each downspout to daylight or a pop-up emitter well away from the house.
How it works →A grated inlet at the low point, piped to an outlet or an underground chamber that lets water soak away slowly.
How it works →Free drainage check request
Tell us where the water shows up and roughly when it started. We call back to set a time to look.
We'll call to set a time. If it can't wait, call (816) 857-9277
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