- Baltimore County Department of Environmental Protection and Sustainability
- Baltimore County, Maryland
- Our Role
- Construction Oversight, Erosion and Sediment Control Plans, Field Assessments and Documentation, Landscaping, Permitting, Regenerative Stormwater Conveyance Design,Total Maximum Daily Load Calculations.
- 5 years
- Innovative approach to provide stormwater treatment, infiltration, and conveyance
- Benefits the larger watershed by intercepting storm flow and improving water quality
- Use of natural infiltration
- Functions well through significant rainfall events.
An innovative approach to provide stormwater treatment, infiltration, and conveyance was the key to repairing eroded storm drain outfall channels and a tributary near Magnolia Avenue in Baltimore County, Maryland. The challenge was to restore and improve the channels to protect against channel and bank erosion and to improve downstream water quality for a suburban neighborhood. Complicating matters, the project location was topographically steep, making it unstable and subject to erosion during storm events. A solution well-suited for this steep terrain was needed.
Gannett Fleming designed Baltimore County’s first regenerative stormwater conveyance (RSC).
RSC systems are open-channel, sand seepage filtering systems that use a series of shallow aquatic pools, riffle weir grade controls, native vegetation, and an underlying sand channel to treat and safely detain and convey storm flow and convert stormwater to groundwater through infiltration.
During the construction oversight, we reviewed contractor requests for information and visited the construction site regularly for oversight. Additionally, during the construction phase, we observed the regenerative stormwater conveyance at work, monitoring its performance to restore and improve the channels and protect against channel and bank erosion.
- Regenerative Stormwater Conveyance adapted to a piedmont setting
- Low-impact development, environmental site design, and sustainable green infrastructure
- Ecosystem restoration
- Landscaping with native species and sustainable plantings.