French Drain Installation in Lawrenceburg, KY

Anderson County's ground

The Kentucky Geological Survey's land-use notes for Anderson County lay out the drainage-related hazards plainly. Seepage occurs at the boundary between overlying permeable and underlying impermeable rock, causing foundation disturbance, flooding, soil movement, wet basements and failed septic systems. Sinkhole cover collapse can follow years of settlement as surface and groundwater drainage moves supporting soil into voids in the limestone below. And in karst basins, sinkhole swallets and solution channels are not large enough to carry off the water from a large storm, so the basin floods.

That is a county where a wet basement can have three different causes, and where the fix depends on getting the cause right. A seep line along a hillside lot needs an interceptor drain above the house. A flat karst basin lot needs a surface outlet and a rule against putting anything into the sinkhole. A foundation with water at the cove joint after every rain often just needs roof water and grade handled.

Around the square and out toward the distilleries

Lawrenceburg's older neighborhoods around Main Street and the courthouse have houses with cellars and stone foundations, mature trees and roof water landing at the wall. Downspouts underground to the street and clay fill to rebuild positive grade come first; where water is still coming in low, an interior drain and sump with a discharge carried clear of the house follow.

The subdivisions that grew out along US 127 and toward the parkway sit on graded clay with rear swales, and when those swales are blocked the back yards pond. Lots toward the Kentucky River side of the county have more slope and more surface runoff arriving from above; those get swales and armored dry creek beds on the uphill side.

Reading a wet spot in Anderson County

The reason KGS's list of Anderson County hazards matters for a homeowner is that a wet spot on a Lawrenceburg lot can be any one of three things, and each takes a different fix. If the ground is wet in a low area that dries out a day or two after rain, it is a grading problem: reshape the surface so the water reaches an edge. If a spot on a slope stays wet for weeks regardless of rain, it is likely a seep where water moving through fractured limestone hits shale and comes out; that takes an interceptor drain cut across the slope above it, carried to daylight. If a depression takes water fast and is slowly getting deeper, it is karst, and it gets a geotechnical evaluation and a strict rule that nothing is piped into it.

The assessment sorts those out with a probe, a level and a look at how the spot behaves relative to the weather. Getting it wrong is expensive: a French drain across a seep line that is not deep enough to catch the water does nothing, and grading fill dumped into a karst depression adds weight over a void. Anderson County's more rugged ground toward the Kentucky River adds surface runoff from above to the list, and on those lots swales and armored dry creek beds do the work before any pipe is considered.

Working in Lawrenceburg

Anderson County is on the far side of the Bluegrass from Lexington's east-side suburbs, but well within range for a free on-site assessment. The plan you get names the cause, the outlet and the route, and it is drawn for your slope, your soil depth and the rock underneath it, not for a lot in Fayette County.