BMP and Detention Ponds

Best Management Practices (BMP) and Detention Ponds

Structural Best Management Practices, also known as BMP, help control the flow of stormwater. BMP reduce downstream flooding, provide natural filtration to reduce pollutant levels, and improve the overall health of the environment. The Department of Water Resources inspects all BMP to ensure they are properly maintained.

For questions about maintenance of BMP and detention ponds, contact: DWRstormwaterBMP@GwinnettCounty.com or call 678.376.7193.

Examples of some common BMP are below.1

Bioretention Area

Green Infrastructure

A bioretention area is a shallow stormwater basin or landscaped area with well-draining soils such as sand, fines, organic matter, and vegetation to capture and treat stormwater runoff.

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Bioslope

Green Infrastructure

A bioretention area is a shallow stormwater basin or landscaped area with well-draining soils such as sand, fines, organic matter, and vegetation to capture and treat stormwater runoff.

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Dry Detention Basin

Green Infrastructure

A bioretention area is a shallow stormwater basin or landscaped area with well-draining soils such as sand, fines, organic matter, and vegetation to capture and treat stormwater runoff.

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Enhanced Swale

Green Infrastructure

A bioretention area is a shallow stormwater basin or landscaped area with well-draining soils such as sand, fines, organic matter, and vegetation to capture and treat stormwater runoff.

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Gravel Wetland

Green Infrastructure

Gravel wetlands are similar to a regular stormwater wetland except it is filled with crushed rock or gravel and designed so that the rock or gravel is submerged.

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Oil and Grit Separator

Traditional BMP

Oil and grit (Gravity) separators are used to clean stormwater runoff by removing settleable solids, oil, grease, and floating debris using gravitational settling and pollutant trapping.

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Pervious Pavement

Green Infrastructure

Pervious pavements are a green infrastructure alternative that allows stormwater to infiltrate through the surface of the pavement to the ground below.

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Sand Filter

Green Infrastructure

Pervious pavements are a green infrastructure alternative that allows stormwater to infiltrate through the surface of the pavement to the ground below.

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Stormwater Conveyance

Green Infrastructure

Pervious pavements are a green infrastructure alternative that allows stormwater to infiltrate through the surface of the pavement to the ground below.

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Underground Detention

Traditional BMP

Sand filters are multi-chamber structures designed to treat stormwater runoff through filtration, using a sediment forebay, a sand bed, and typically an underdrain system.

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Vegetated Filter Strip

Green Infrastructure

Vegetated filter strips are uniformly graded and densely vegetated sections of land, designed to treat runoff and remove pollutants through vegetative filtering and infiltration.

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Wet Detention Basin

Green Infrastructure

Vegetated filter strips are uniformly graded and densely vegetated sections of land, designed to treat runoff and remove pollutants through vegetative filtering and infiltration.

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