Typical BMP TSS and TP removal rates from Minnesota Stormwater Manual Typical BMP TSS and TP removal rates from Minnesota Stormwater Manual

Typical BMP TSS and TP removal rates from Minnesota Stormwater Manual
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BMP type	Typical pollutant removal rate (%)
	TSS	TP
Biofiltration	80	[1]
Sand filter	85	50
Iron enhanced sand filter	85	65 or 741
Dry swale	68	[2]
Constructed wet ponds	84	50 or 682
Constructed wetlands	73	38
Permeable pavement	74	41
Green roof	85	0

¹Lower values are for Tier 1 design. Higher values are for Tier 2 design.
²Removal is for Design Level 2. If an iron-enhanced pond bench is included, an additional 40 percent credit is given for dissolved phosphorus. Use the lower values if no iron bench exists and the higher value if an iron bench exists.