Celebrating the restoration of Donnybrook Stream

Stream restoration is a set of techniques or methods the County uses to protect properties and public infrastructure by reducing stream bank erosion, minimizing the down-cutting of stream beds, and restoring aquatic ecosystems (natural stream systems).

Restoration techniques typically use natural materials such as rocks, logs, and native plants to help slow down stormwater flow and restore the natural meander of curve pattern found in stable streams. They are usually done in larger scale projects utilizing large equipment to mobilize plants and rocks.

A positive impact on Donnybrook

The Donnybrook restoration project occurred along approximately 2,000 linear feet of the stream. It involved the use of natural channel design principles, stream forest buffers, stormwater management facilities, and the planting of over 560 native trees and shrubs. The project required coordination with local residents and collaboration with the DOT to replace a pedestrian bridge widely used by the community. Look below for a series of before and after images that show how the stream was restored.

For more information, contact Don Dorsey at donald.dorsey@montgomerycountymd.gov or 240-777-7712.

Eroded stream banks were graded and structures (the log on the right) used to prevent water from further eroding the banks.

Eroded stream banks were gently sloped and planted with native vegetation to prevent further erosion.

The creation of pools is critical habitat for aquatic species. Areas of rocks between the pools help agitate the water to introduce oxygen into the stream.

Eroded stream banks have been gently sloped and planted with native vegetation to prevent further erosion.

Eroded stream banks have been gently sloped and planted with native vegetation to prevent further erosion.

Stormwater is captured in a local rain garden and flows through an upgraded outfall structure. This photo also shows DOT’s redesigned pedestrian bridge.