Primary and secondary pollutant removal mechanisms

List of BMPs and associated pollutant removal mechanisms. Primary removal (solid circles) means the BMP was designed for this specific mechanism. Secondary removal (half circles) means the BMP provides additional removal of pollutants for this mechanism even though the BMP was not designed for that purpose. An empty cell means the BMP provides limited or no removal for that mechanism.
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BMP group	Pollutant removal mechanisms
	Water quality						Water quantity
	Filtration	Infiltration	Settling	Biological uptake	Temperature control	Soil adsorption	Volume control	Rate control	Velocity control	ETa
Pollution prevention	Not applicable - pollutants not exposed to stormwater
Better Site Design/low impact development
Runoff volume minimization
Temporary construction sediment control
Bioretention
Filtration
Infiltration
Stormwater ponds
Stormwater wetlands
Supplemental treatment	Each supplemental and proprietary device should be carefully studied to learn the primary and secondary removal functions