HomeMy WebLinkAboutSDP201500007 Calculations Final Site Plan and Comps. 2015-12-29 ENGINEERING CALCULATIONS CHAPTER 5
Table 5-14
Water Quality BMP Pollutant Removal Efficiencies
Water Quality BMP* Target Pollutant Removal Efficiency Percent Impervious Cover
Vegetated filter strip 10% 16-21%
Grassed swale 15%
Constructed wetlands 30%
Extended detention(2 x WQ Vol) 35% 22-37%
Retention basin I(3 x WQ Vol) 40%
Bioretention basin 50%
Bioretention filter 50%
Extended detention-enhanced 50% 38-66%
Retention basin II(4 x WQ Vol) 50%
Infiltration(1 x WQ Vol) 50%
Sand filter 65%
Infiltration(2 x WQ Vol) 65% 67-100%
Retention basin III(4 x WQ Vol 65%
with aquatic bench)
*Innovative or alternative BMPs not included in this table may be allowed at the discretion of the local program administrator,
the plan approving authority,or the Department
5-106