Start at the high end of the driveway
Watch from a safe spot during rain. If water comes from a downspout or hillside, look upstream for a way to intercept it. If water enters at the street, photograph the roadside ditch or inlet and note whether it was already full before water crossed the driveway.
Mark the low spot and the lowest garage or walkway threshold. After the storm, check whether water sits on the pavement or the adjoining lawn stays soft. That timing helps distinguish surface runoff from soil saturation.
Match the drain to how the water moves
| What you see | What to check first |
|---|---|
| A sheet of water runs across pavement toward the garage | A channel drain across the flow path may collect it if there is a suitable outlet. Check the grate and channel’s suitability for vehicle traffic. |
| A puddle collects at one low corner | A catch basin or surface inlet may fit where the water already concentrates. |
| Water leaves the driveway and runs along the house | Check whether grading or a shallow swale can intercept the flow before it reaches the house. |
| Pavement dries but the lawn below it stays soft | Trace the source before choosing a French drain. It may help with water in the soil where a workable outlet exists. |
Check the roadside ditch and culvert before altering either
If water rises on one side of the driveway entrance and the other side stays comparatively low, document the difference. A blocked inlet, a full ditch downstream, or the way the crossing is built may be involved. Avoid entering moving water or opening a drain during a storm.
If a roadside ditch or culvert appears to be part of the problem, first identify which city, county, or state agency maintains it. Confirm the outlet, easements, and any required approval before changing the drainage path.
Find guidance for your area
These local guides cover different ways driveway runoff shows up in Greenville County.