Stormwater filtration BMPs – selection considerations

Stormwater filtration BMPs – selection considerations
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Stormwater BMP	Illustration	Cost	Maintenance Requirements 3	Space needed	Pretreatment 4	Habitat Quality 5
Dry swale or wet pool		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 pool		Low	Simple	Small	Oil/Water Separator	Low
Biofiltration Basin		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)		Medium 3‐10 CF	Medium	Small to medium	No Pretreatment Required	None
Tree Trench/Tree Box (with underdrain)		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)		Low	Simple-moderate	Small	Needed Oil/Water Separator, Vegetated Filter, Sediment Basin	Low
Green roof		High	Moderate-intensive	Small	Low	Medium

¹ Maintenance requirements to be addressed and updated in future section
² Pretreatment requirements to be revised as per updated section
³ Habitat quality refers to the possible diversity of plantings commonly installed with each BMP