BMP pollutant removal for metals | Minnesota Stormwater Manual

Median pollutant removal of copper and zinc by stormwater treatment practices. Values represent percentage of incoming pollutant load that is removed.
BMP group	Copper>	Zinc
Bioretention^a	95	95
Filtration^b	45	85
Infiltration^c	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. Source: Minnesota Stormwater Manual. Manual data was based on information from ASCE/EPA International Database; Winer (2000)