Stowmwater Buffer Zone is a 2 step particulate filtration process that allows zero bypass, even during heavy rain events.
The initial filtration is performed by a lightweight trash screen. This insert is designed to handle low and high flow rates. This screen removes large particulate such as twigs, leaves, and refuse, and allows for water to pass through and collect at the bottom of the catch basin.
The second stage involves filtration via a cone-shaped mesh skirt outfitted with the vertex at the opening of the catch basin and the base located below the outlet pipe. When the height of the stormwater entering the basin exceeds the level of cone filter’s base the water is filtrated through the filter membrane at 20μm (microns) due to increasing pressure head. The filter has 3 filtration regions to accommodate light to heavy precipitation events while at the same time allowing no water to exit the basin completely untreated for particulates.
Additional removal through settling is due to the filter system extending the detention time of particulates present in the basin.