DRY DETENTION PONDS 

Extended detention basins, often called dry basins, are designed to temporarily detain stormwater. This BMP is similar to detention basins used for flood control, however EDBs use a much smaller outlet that extends the emptying time of the runoff to facilitate pollutant removal. EDBs are equipped with a concrete forebay, trickle channel, micro-pool, and an outlet structure with orifice plate.

GRASS SWALES/BUFFERS

Grass swales are shallow, sloped, densely vegetated triangular channels designed to treat stormwater runoff. Similarly, grass buffers are vegetated areas surrounding wet basins and wetlands. As water flows over these swales and buffers, vegetation slows the water and allows for sedimentation and filtering of pollutants through the subsoil.

 RETENTION POND

Retention ponds are permanent artificial ponds that store excess runoff. A retention pond is known by several different names: retention basin, wet pond, wet detention pond, stormwater pond and best management practice (BMP).Wet ponds require more maintenance than dry ponds because it is a permanent water source. The owner of the retention basin is generally responsible for the pond’s maintenance. That means the owner is responsible for routine maintenance and post-storm check ins.

General maintenance involves:

• Removing trash from in and around the wet pond
• Maintaining the vegetation that surrounds the pond
• Check the forebays for sediment build up and remove sediment as needed
• Resolve erosion issues

 PERMEABLE PAVEMENT

 Permeable pavements refer to a variety of pavements that replace traditional pavement and allow for the infiltration of stormwater into the subsoil by placing a pervious pavement surface over a stone aggregate. Permeable pavements allow for runoff to infiltrate the underlying void spaces in the stone aggregate while providing stable surfaces for traffic loads and pedestrians.

 PROPRIETARY DEVICES

Manufactured or proprietary stormwater control measures are devices that use proprietary settling, filtration, absorption/adsorption, vortex principles, vegetation, and other processes to meet permanent stormwater management requirements.

RAIN GARDENS/ BARRELS

A rain garden is a landscaped area planted with wildflowers and other native vegetation that is used to soak up rainwater from the roof, driveway, and lawn. The water slowly seeps into the ground instead of heading for the nearest storm drain. A rain garden allows for significantly more water to soak into the ground than a conventional lawn. A rain barrel is a device to collect rainwater from downspouts.