Unit processes of stormwater pretreatment techniques (Adapted from WEF, 2008)
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Control | Vegetated filter strips | Vegetated swale | Forebays | Street/parking lot sweeping | Proprietary settling/swirl chambers | Oil/water separators | Green roofs | Cisterns | Drain inlet inserts |
---|---|---|---|---|---|---|---|---|---|
Peak flow attenuation | X | X | |||||||
Runoff volume reduction | |||||||||
Infiltration | X | X | |||||||
Dispersion | X | X | X | ||||||
Evapotranspiration | X | ||||||||
Runoff collection and usage | X | ||||||||
Sedimentation | X | X | X | X | X | X | |||
Flotation | X | X | X | ||||||
Laminar separation | X | ||||||||
Swirl concentration | X | ||||||||
Sorption | X | ||||||||
Precipitation | |||||||||
Coagulation | |||||||||
Filtration | X | X | X | ||||||
Plant metabolism | X | X | X | ||||||
Nitrification/denitrification | |||||||||
Organic compound degradation | |||||||||
Pathogen die off | |||||||||
Temperature reduction | X | X | X | ||||||
Disinfection |