What is a French drain?

A French drain consists of a trench filled with gravel and a perforated pipe that intercepts groundwater before it reaches your foundation or collects in problem areas. The perforations allow water to enter the pipe from surrounding soil, while the gravel layer filters sediment and provides drainage channels. Water flows through the pipe to a discharge point, typically a storm drain, daylight outlet, or sump pit.

French drains work both inside and outside buildings. Interior drains run along the foundation floor, beneath the concrete, to catch water seeping through basement walls or wicking up from the soil below. Exterior drains are installed around the perimeter of a foundation, dug down to the footing level, to intercept groundwater before it reaches the structure. Both setups solve the same problem: moving water away so it cannot pool against the foundation or create dampness inside.

The effectiveness of a French drain depends on proper slope toward the discharge point and adequate maintenance to prevent gravel clogging. In Trumbull County's clay-heavy soil and wet conditions, many homes and buildings rely on these systems to manage seasonal groundwater rise. If your property stays damp after heavy rain or you notice water intrusion in your basement, a waterproofing and drainage provider can evaluate whether a French drain is the right solution for your soil and water flow conditions.