What is a dry well?
An underground chamber or pit that receives roof runoff and drainage water, allowing it to percolate slowly into the soil rather than flowing into storm drains or across the surface.
A dry well is a subsurface structure, typically a lined chamber or basin, that captures stormwater runoff and allows it to soak into the ground gradually. In Connecticut, where heavy clay soils slow drainage, dry wells serve as a practical solution for managing water from downspouts, roof gutters, and French drain systems. Water collects in the chamber and percolates through perforated walls or a porous bottom, dispersing into the surrounding earth over time rather than pooling on the surface or overwhelming local storm drains.
Dry wells work best when installed in areas with adequate soil depth and reasonable drainage capacity. They reduce erosion around foundation areas, prevent standing water in yards, and help minimize runoff during heavy rain events. The system typically consists of a plastic or concrete chamber, sometimes filled with gravel or stone to increase surface area for water absorption. When properly sited and maintained, a dry well reduces stress on municipal drainage systems and helps water return naturally to the groundwater table.
Homeowners in Connecticut often pair dry wells with downspout extensions or French drains as part of a larger stormwater management strategy. Landscape contractors can assess your soil conditions and site drainage to determine whether a dry well is appropriate for your property and how deep it should be installed.