The Ultimate Guide to Preventing Yard Flooding with Smart Drainage Solutions

A dry well stores collected water and allows it to soak into the surrounding soil. It can work only if the receiving ground accepts water fast enough for the intended use and the site provides suitable conditions.

Clay is not a reason to assume a dry well will work particularly well. Slow infiltration can be the reason it fills up and stays full.

Storage isn't the same as disposal

A dry well has finite available storage. Water entering it takes up that space until it infiltrates or leaves through a designed route. If another storm arrives before the storage recovers, there may be little room for new runoff.

A bigger hole can add storage, but it doesn't automatically correct slow infiltration. Once available storage is used, incoming water needs an overflow route or it can back up.

Test the receiving soil

Charlotte-area properties often include clay-rich soil, but conditions vary within a site. Texture, compaction, layering, saturation, and the position of the proposed system affect infiltration.

Suitability needs site investigation and an appropriate infiltration assessment. Also check groundwater conditions, structures, utilities, space, and the location of any overflow. A low spot or a small yard isn't enough to select a dry well.

Identify the water source

Roof runoff can arrive quickly through a downspout. Surface runoff may carry sediment and debris. Water in saturated soil creates a different collection problem.

The inlet, pretreatment or maintenance needs, storage, receiving soil, and overflow must fit that source. Calling every water problem a French-drain or dry-well problem skips those decisions.

Consider routes that convey water out

A solid downspout extension or surface collection system may carry water to a suitable gravity outlet. A groundwater drain may address saturated soil where it can intercept and discharge the water. Where elevations prevent gravity drainage, an exterior pump may be worth evaluating.

Those alternatives also need a suitable receiving area. No component removes the need to account for where the water goes.

Ask for evidence before accepting the recommendation

Ask what infiltration assessment supports the proposal, how the system recovers between storms, and where water goes when storage is full.

Dry wells can work in suitable conditions. They need a site-specific assessment rather than being presented as an automatic cure for clay soil. Our drainage assessment starts with the water source and a workable collection and discharge route.

Need help with exterior drainage in the Charlotte area? Call Drain My Lawn at 704-489-3444 or visit www.drainmylawn.com.