Bioretention Cell Sizing How large a cell needs to be depends on the stormwater management goals for the facility and the space available in the right-of-way. Read More
Inflow, Outflow, & Overflow The design of the inflow, outflow, and overflow path depend on the amount of stormwater runoff that the facility is intended to infiltrate or convey, operation and maintenance requirements, site context, pedestrian and bicyclist safety considerations, and the type of Read More
Inlet Design Inlets convey stormwater runoff from the surrounding street catchment area into the bioretention facility. Details of inlet design—including width, grade, and location—guide the stormwater into and out of the stormwater cell. Read More
Presettling Zone A presettling zone is an area made of cobbles or concrete that captures debris, pollution, and sediment at the upstream end of a bioretention facility. Read More
Soil, Media, & Plantings Soil characteristics should be chosen to support drainage, pollutant removal rates, and plant health and viability. Plantings should include a diverse community of native species. Read More