Yard Drainage in the Kansas City Metro

Most calls about a swampy yard turn out to be about fall, not soil. Water needs somewhere lower to go, and on a lot where the builder's original grading has settled over twenty or thirty years, the lower place is often now the middle of the lawn. We shoot grades before proposing anything.

A quarter inch of fall per foot, recovered by regrading, solves problems a drain would only manage.

Where soil genuinely is the constraint, it is usually the high-clay uplands. Sharpsburg and Grundy on the Kansas side and the clay and shale soils on the Missouri side hold water at the surface long after a sandier profile would have drained, which is why the same rainfall produces a two-day puddle on one street and nothing on the next.

Catch basins at the low points, solid pipe carrying collected water to an outlet, regrading to move surface water toward those basins rather than toward the house, and where appropriate a swale to intercept water crossing the lot before it reaches anything you care about. On lots with real fall, a swale alone sometimes does the entire job for a fraction of a piped system.

What we do not do is install a system that dumps a neighbor's problem onto them. In Overland Park that is codified, with sump discharge required five feet off any property line and constant discharge onto a sidewalk abatable as a nuisance, but it is the right approach everywhere.

Typical residential yard drainage projects run quoted from a written scope. The variables are the area being drained, how many collection points it needs, the distance to a workable outlet, and how much regrading and sod restoration is involved. A single low corner with a basin and a short run to daylight sits at the bottom of that range; a full rear yard with multiple basins and a long carry sits near the top.

Every proposal states the collection points, the pipe route, the outlet and the restoration. If the honest answer is that regrading alone will fix it, that is the proposal you get.

The best time to assess a drainage problem is during or just after a heavy rain, when the water is visible. If you can, photograph or video the standing water before it drains and send it with your call. That single piece of evidence is worth more than anything we can infer from a dry lot in August.

Spring is when Kansas City soils are at their wettest, and it is when the seasonal perched water table sits highest in the Johnson County clays. A system designed on a July site visit can be undersized for April conditions, which is why we ask what the yard does in spring even when we are standing in it in summer.