BMP pollutant removal for metals

Median pollutant removal of copper and zinc by stormwater treatment practices. Values represent percentage of incoming pollutant load that is removed. Source: Minnesota Stormwater Manual. Manual data was based on information from ASCE/EPA International Database; Winer (2000)

BMP group	Copper>	Zinc
Bioretentiona	95	95
Filtrationb	45	85
Infiltrationc	100	100
Stormwater ponds	55	65
Stormwater wetlands	40	40

^aData based on fewer than five monitoring studies
^bExcludes vertical sand filters and filter strips
^cNote that 100% is assumed for all infiltration, but only for that portion of the flow fully treated in the infiltration facility; by-passed runoff does not receive any treatment.