The V2B1’s compact design is wellsuited for space constrained and urban sites, where the installation of a larger stormwater treatment is impractical. Depending on state regulations, these devices are used by themselves, or as a pretreatment system in conjunction with other stormwater treatments.

The V2B1 is a two-chambered system encased in two, shallow, pre-cast concrete storm drains in series. Each drain measures four feet in diameter. Stormwater enters the first drain, where a tangential inlet pipe creates a vortex and hydrodynamic separation for sediment removal. A four- to five-foot deep sump provides sediment storage. Stormwater then enters the second drain, where a floatables chamber containing a baffle wall traps floating oil and organic debris. An underflow opening beneath the baffle wall directs water to the outlet pipe.

Maintenance requirements are similar to other hydrodynamic separators and include the periodic removal of solids by a vacuum truck. The unobstructed access and lack of moving parts enables easy maintenance.