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Stormwater Remediation

Best Management Practices

Best management practices (BMPs) are identified and implemented to improve water quality. These practices are designed to:

  • reduce the effects of urban and suburban stormwater runoff
  • interrupt the direct connection between impervious surfaces and streams
  • stabilize streams and waterways to minimize erosion
  • reduce sediment and nutrient pollution entering the Chesapeake Bay


The Department of Environmental Protection and Sustainability oversees a number of restoration initiatives throughout the County, including:

Stormwater Management Facility Inspection and Maintenance

There are more than 2,900 stormwater management facilities in the County. Public facilities are maintained by County field crews. Private facilities are constructed and maintained by the owners, while County inspectors enforce maintenance regulations.

Image of a worker conducting stormwater facility maintenance.

Steam Restoration

Redhouse Run at St. Patrick Road

Completed in 2011, this project stabilized 2,000 linear feet of degraded stream that was jeopardizing sewer and roadway infrastructure. Annually, this initiative removes 400 pounds of nitrogen, 126 pounds of phosphorous and 620,000 pounds of suspended solids.

Image of Redhouse Run project before restorationImage of Redhouse Run project after restoration
Redhouse Run stream restoration before (left) and after (right).

Gwynns Falls at Chartley

Completed in 2008, this project replaced 2,000 linear feet of failing concrete channel using natural stream restoration design techniques. Annually, this initiative removes 400 pounds of nitrogen, 136 pounds of phosphorous and 620,000 pounds of suspended solids.

Image of Gwynns Falls project before restorationImage of Gwynns Falls project after restoration
Gwynns Falls stream restoration before (left) and after (right).

Stormwater Retrofitting

Evergreen Stormwater Pond

Completed in 2011, this project converted a dry pond to an extended detention pond and wetland planting. Annually, the facility removes 39 pounds of nitrogen, eight pounds of phosphorous and 4,331 pounds of suspended solids.

An image of Evergreen Stormwater Pond.

The Fields at Renaissance Park

Completed in 2007, this stormwater management pond and community park removes 177 pounds of nitrogen, 37 pounds of phosphorous and 22,437 pounds of suspended solids.

Image of completed Renaissance Stormwater Pond.

Shoreline Protection and Enhancement

Utilization of hard and soft engineering techniques reduces erosion and improves ecological function along the County's tidal shorelines and waterways.

Image of a shoreline restoration project.

Stormwater Inlet Cleaning

On average, countywide storm drain cleaning is responsible for removing 1,588 cubic yards of debris each year.

Image of storm drain cleaning.

Street Sweeping

Trash and debris traveling into storm drains is a major contributor to stormwater pollution entering into the watershed. Traditional street sweeping efforts are quite effective in collecting the trash before it reaches the storm drains.

Image of a street sweeper truck.
Revised July 12, 2017         


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