Top Rainwater Harvesting Solutions for a Healthier Lawn Drainage

A rain barrel stores roof water for later use. A downspout drainage system carries roof water away from a problem area. Storage and conveyance are different jobs.

If a downspout is washing out soil beside your house, adding a barrel only addresses part of the water path. You still need to know where the overflow goes.

Storage has a limit

A barrel can accept water only while it has available space. Once full, incoming water needs another route. A full barrel beside the foundation may leave you with the same concentrated roof discharge you were trying to manage.

How quickly that happens depends on the storage size, the roof area draining into it, rainfall, and how much water is used between storms. Don't assume a container can handle a storm without checking those relationships.

Follow the overflow

Look at the barrel's overflow connection and receiving area. Water should not simply spill onto an eroding slope, a walking area, or the wet spot beside the house.

If overflow needs buried conveyance, its route, elevations, maintenance access, and discharge need the same attention as a downspout extension. A container doesn't remove those design decisions.

Keep roof runoff distinct from groundwater

We use solid pipe for roof-water conveyance. A perforated French drain is a groundwater collection system. Routing concentrated roof runoff into a groundwater collection bed is not an interchangeable substitute for planning a solid discharge route.

A rain garden or permeable surface also doesn't become a rainwater-storage tank just because it manages some runoff. Infiltration depends on the receiving soil and site conditions, and storage still has a finite volume.

Decide which problem you're solving

If your goal is water reuse, evaluate storage and its overflow as a complete arrangement. If your goal is to stop roof runoff from pooling or causing erosion, evaluate collection and discharge first.

For exterior drainage, our concern is the water source, the route, and where it exits. A separate water-reuse project still needs to account for that drainage path.

Before adding storage, sketch the path water takes when the container is already full. That is often the missing part of the plan.

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