Patio and Yard Drainage on Lake County Clay Soil

Vernon Hills and much of Lake County sit on heavy clay. Clay is slow to absorb water, which means that when it rains hard, the water has to go somewhere on the surface. If nobody planned where, it goes toward your house, your patio, or the low spot in the middle of the lawn.

Start with grading, always

Before anyone sells you a drainage system, look at the grade. The ground should fall away from the foundation about six inches over the first ten feet. A surprising number of yards have settled over the years into a slight slope back toward the house, and no amount of buried pipe fully compensates for that.

Regrading is not glamorous and it is often the cheapest permanent fix on the list. Adding and shaping soil to restore positive fall away from the structure solves a large share of the wet yard calls we get.

Then look at your downspouts

A roof sheds an enormous volume of water in a storm. If your downspouts dump it at the foundation, you are concentrating hundreds of gallons in exactly the worst location. Extending downspouts at least six to ten feet away, or piping them underground to a discharge point, is inexpensive and frequently solves problems people assumed needed major work.

Drainage systems that work on clay

French drains

A trench with perforated pipe in clean gravel wrapped in filter fabric, intercepting subsurface water and carrying it away. It works, with one condition specific to our soil: it must outlet somewhere. On clay, a French drain that simply ends underground has nowhere to send water and becomes an expensive buried trough.

Surface drains and catch basins

For a genuine low spot that ponds after every rain, a catch basin with a grate, piped to a discharge point, removes surface water directly. These are simpler and often more effective than subsurface systems in clay, since the problem is usually surface water that will not infiltrate.

Dry wells, with a caveat

A dry well is a buried gravel chamber that holds water while it soaks into the surrounding soil. That premise depends on soil that absorbs water. In heavy clay a dry well fills and then just sits there. They can help with small volumes, but on most Lake County properties, conveying water somewhere beats trying to infiltrate it in place.

Rain gardens and swales

A shallow planted depression with water tolerant natives, positioned to receive runoff, handles moderate volumes attractively and is well suited to our region if it is sized properly and amended for drainage. A gently graded swale can move water across a yard without any pipe at all.

How this ties into a patio

Any patio we build on clay gets a drainage plan as part of the design, not as an afterthought. The surface needs about a quarter inch of fall per foot away from the house, and if the patio sits in a spot where water naturally collects, the base needs a drain line to move that water out from under it. Water trapped under a patio base on clay is what causes heaving.

Know the limits

Two honest caveats. You cannot discharge water onto a neighbor's property, and municipalities on the North Shore have rules about where stormwater may go. And if water is entering your basement, that is a job for a waterproofing specialist. Exterior grading and drainage help, but they are not a substitute for addressing a foundation problem.

If your yard holds water after every storm, we can look at the grade and tell you what is actually causing it. Call or text 224-634-0673 or 224-200-8363.

Ruiz Landscaping serves Vernon Hills, Libertyville, Mundelein, Buffalo Grove, Lincolnshire, Long Grove and the rest of Vernon Hills's surrounding North Shore and Lake County communities.