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Environmental Protection and Sustainability
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Stormwater Conversion and Retrofit Projects

A stormwater treatment facility in Sue Creek.
A stormwater retrofit facility
in Sue Creek.

Stormwater retrofit projects are new projects that involve the installation of Best Management Practices (BMPs) to store and treat stormwater runoff particularly in communities built prior to stormwater management requirements. Best management practices include stormwater ponds, wetland and marsh creation, underground water quality devices, storm drain outfall protection and bio-retention facilities. Watershed Restoration's Stormwater Retrofit Program updates and improves older stormwater management facilities (conversions) and installs new treatment devices for stormwater management to improve the water quality of the County waterways.

These facilities and retrofits retain and in some cases filter stormwater to lessen the quantity of water that is entering the stream at one time. The first inch of rainfall is most likely to be carrying pollutants washed from the streets, parking lots, and rooftops (impervious surfaces). These stormwater facilities and retrofits ensure that this polluted runoff is allowed to soak into the ground to filter pollutants before they reach streams and tidal waters. 

Types of Stormwater Facilities and Retrofits

Type

Typical Features

Benefits

Stormwater Pond


Impoundment pond to slow, retain and filter water

Wetland plants

Slows stormwater allowing infiltration

Allows sediment to settle out

Reduces flooding

Improves water quality and nutrient uptake

Bio-Retention Facility


Vegetated cells and areas

Rain gardens

Planted marshes and wetlands

Absorbs and filters water

Creates habitat

Helps reduce flooding

Aesthetic appeal

Improves nutrient uptake

Water Quality Device

Underground device connected to a storm drain pipe

Filters oil, grit, trash and sediment from stormwater

On-line, Beginning or End of Pipe Improvements

Micro pools

Forebays

Gabion sandwiches

Sand filters

Rain barrels

Captures and retains water

Dissipates energy of water

Reduces erosion

Filters water

These facilities and retrofits retain and in some cases filter stormwater to lessen the quantity of water that is entering the stream at one time. The first inch of rainfall is most likely to be carrying pollutants washed from the streets, parking lots and rooftops (impervious surfaces). These stormwater ponds and retrofits ensure that this polluted runoff is allowed to soak into the ground to filter pollutants before they reach streams and tidal waters.

This is a new stormwater treatment facility in White Marsh.
This facility provides treatment to
runoff in the White Marsh Run
watershed.

Stormwater Conversion and Retrofit Program Highlights

  • WR has completed many stormwater retrofit projects including stormwater conversions, wetland enhancements, underground devices and pond creations.
  • Conversion projects have enhanced and created acres of vegetated areas which treat runoff from impervious surfaces resulting in reduction in pollutants, sediment and nutrients entering and impairing local waterways.

Contact Information

Watershed Restoration
Call 410-887-2904, fax 410-887-4804 or email watersheds@baltimorecountymd.gov.

Revised December 4, 2014

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