Unit processes of stormwater pre-treatment techniques
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 | |||||||
| 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 | ||||||||
| Filtration | X | X | X | ||||||
| Plant metabolism | X | X | X | ||||||
| Temperature reduction | X | X | X |