Reducing runoff with permeable pavement
As part of the permitting process, the Tennessee Department of Environment and Conservation mandates the City of Kingsport offer educational and outreach activities regarding stormwater, the city’s various control measures and why those measures are important to the general public.
The following article discusses permeable pavement and its effect on reducing runoff.
Permeable or porous pavement is a type of Stormwater Control Measure (SCM) that allows rain water to infiltrate into the pavement surface and thus reduces runoff during storm events. There are several types of permeable pavement, including permeable pavers, pervious concrete, and porous asphalt.
Permeable pavement is only recommended for parking lots and low traffic areas. Most systems have an underdrain that discharges into the stormwater conveyance system.
Most permeable pavement systems have the same basic components to help them function properly, including:
- Pavement surface: Contains joints or voids to allow stormwater to infiltrate.
- Main treatment area: Contains gravel and sand layers that allow infiltration, filtration, and storage of stormwater.
- Underdrain: Collects and discharges filtered stormwater.
- Outlet structure: Usually a storm drain for emergency overflow.
- Underdrain cleanout: Allows for maintenance of the underdrain.
Permeable pavements may be inspected by the local municipality to ensure they are functioning correctly. However, all maintenance is the responsibility of the property owner.
In order for permeable pavement systems to work efficiently, trash, litter and debris should be removed and a landscape blower used on the surface. Permeable pavers and porous concrete/asphalt should be vacuumed. Sand and sediment can clog the system.
If you have a concern about a specific permeable pavement system in Kingsport, you may call Water Services at 423-229-9454. You can also report any possible issues by using the ConnectKingsport app.
