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Delaware Department of Transportation

Stormwater Management

BMPs - Structural


Quantity Control Devices: These include detention/retention ponds, constructed wetlands, dams and check dams and rain barrels. Ponds and wetlands also provide some biological treatment of polluted water, as well as habitat for fish and wildlife.


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Stormwater Pond

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Stone Check Dams in Swale

Constructed Wetland


Filtration Devices: These include bio-filters, grassy swales, sand filters, catch basin inserts, manufactured bags and booms or skimmers. They remove particulates and associated pollutants such as heavy metals and phosphorous.


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Sand Filters

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Storm Filter

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Installing a Catch Basin Insert Filter


Infiltration Devices: These include underground stormwater storage vaults, bio-retention areas, porous pavement, dry wells, dry swales, infiltration basins and infiltration trenches. They allow stormwater to return to the ground, rather than simply run off impervious surfaces.


Dry Pond

Porous Pavers

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Bioretention Cell


Hydrodynamic Devices: These are special structures that concentrate and remove sediment, litter and other floatable solids, and oil. They include proprietary devices such as BaySaver®, Stormceptor®, and Aquaswirl®.


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BaySaver®


Erosion Control Devices: These include silt fences, erosion blankets, vegetative covers, riprap (stone) coverings or barriers, mulches, and sandbag dikes. Detention practices that slow the peak flow of stormwater also serve to decrease erosion in stream channels.


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Silt Fence

Pyramat Erosion Blanket

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Silt Fence and Riprap



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