Storm Water Best Management Practices into the Existing Urban Landscape – Systems for Controlling Sediments

摘要

The operation of an 'advanced' hydrodynamic vortex separator (AVS) designed forstormwater sediment interception has been examined using particle capture and retentionefficiency testing and dye tracer testing. For retention efficiency in particular (referringto the efficiency with which a chamber retains pollutants following capture) the resultsare compared with those for other configurations, including simple vortex and gravityseparation devices. The results show how the collection and retention efficiencies of theAVS are enhanced through the presence of a quiescent zone in the base where solids arestored. A simple model of system operation is considered, based on the surface loadingrate of the active region and the particle sedimentation velocity. It is concluded that acomprehensive model of system performance needs to take into account a variety offactors, including the detailed characteristics of the sediment material and thehydrodynamic characteristics of the specific separation device in question.