Unit processes of stormwater pre-treatment techniques 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