How it works
Stormwater is introduced tangentially into the side of the vessel, initially spiralling around the perimeter. Oil and floatables rise to the water surface and are trapped in the outer annular space. As the flow continues to rotate about the vertical axis, it travels downward. Low energy vortex motion directs sediment toward the centre and base of the vessel. Internal components at the base protect stored sediments and direct the effluent up through the inner annular space. A stable flow regime maximises removal and prevents re-entrainment of stored pollutants.