| Stormwater BMP |
Illustration |
Pollutant Removal Mechanism |
Location in Treatment Train |
Pollutant Removal 1 |
Potential Application |
Cost |
Maintenance Requirements 3 |
Space needed |
Pretreatment 4 |
Habitat Quality 5 |
| Dry swale or step pool |
|
Sedimentation / Infiltration |
Throughout |
TSS: Medium
TN: Low
TP: Medium
Chloride: Low
Metals: Medium
Oils and Grease: Low
Pathogens: Low |
Residential
Commercial
Industrial
Highway/Road
Recreational |
Low to medium (depends on components) |
Simple‐Intensive |
Small |
Oil/Water Separator
Sediment Basin (depending on watershed soil types, contributing drainage area, and potential for system fouling/plugging) |
Low |
| Wet swale |
 |
Sedimentation / Transpiration |
Throughout |
TSS: Medium
TN: Low
TP: Low
Chloride: Low
Metals: Low
Oils and Grease: Low
Pathogens: Low |
Residential
Commercial
Industrial
Highway/Road
Recreation |
Low |
Simple |
Small |
Oil/Water Separator |
Low |
| Biofiltration Basin |
 |
Sedimentation / Filtration |
Beginning |
TSS: High
TN: Low/Medium
TP: Medium/High2
Chloride: Low
Metals: High
Oils and Grease: High |
Residential
Commercial
Retrofit
|
Low
$0.5‐$1.3 CF |
Simple‐Intensive |
Small to medium |
Needed Oil/Water Separator, Vegetated Filter, Sediment Basin, Water Quality Inlets |
Medium‐High |
| Permeable pavement with underdrain |
 |
Filtration |
Beginning |
TSS: High
TN: Medium/High
TP: Medium/High
Chloride: Low
Metals: High
Oils and Grease: High |
Residential
Commercial
Ultra Urban
Retrofit
|
Medium
3‐10 CF |
Medium |
Small to medium |
No Pretreatment
Required |
None |
| Tree Trench/Tree Box (with underdrain) |
 |
Filtration, Transpiration |
Throughout |
TSS: High
TN: Medium/High
TP: Medium/High
Chloride: Low
Metals: High
Oils and Grease: High
Pathogens: High |
Commercial
Ultra Urban
Retrofit
|
High
$1.80 ‐ $12.70 CF based on
recommended soil volume
of 1,414 CF per tree |
Intensive |
Small to large |
Needed Oil/Water Separator, Water Quality Inlets |
Medium |
| Media filter (sand filter) |
 |
Filtration |
Throughout |
TSS: High
TN: Medium
TP: Medium/High
Chloride: Low
Metals: Medium/High
Oils and Grease: High
Pathogens: High |
Residential
Commercial
Industrial
Recreation |
Low |
Simple-moderate |
Small |
Needed Oil/Water Separator, Vegetated Filter, Sediment Basin |
Low |
| Green roof |
 |
Filtration |
Throughout |
TSS: High
TN: Low
TP: Low
Chloride: Low
Metals: High
Oils and Grease: High
Pathogens: High |
Residential
Commercial
Ultra Urban
Industrial
Retrofit
|
High |
Moderate-intensive |
Small |
Low |
Medium |