Post-construction stormwater Best Management Practices

Post-construction Best Management Practices (BMPs) are employed following new development or re-development. Post-construction BMPs are typically permanent structural BMPs but include other BMPs such as pollution prevention, street sweeping, and pretreatment practices.

The Construction Stormwater General Permit states "Where a project’s ultimate development replaces vegetation and/or other pervious surfaces with one (1) or more acres of cumulative impervious surface, the Permittee(s) must design the project so that the water quality volume of one (1) inch of runoff from the new impervious surfaces created by the project is retained on site (i.e. infiltration or other volume reduction practices) and not discharged to a surface water". To meet this requirement, post-construction practices include permanent treatment with infiltration/filtration BMPs, wet sedimentation basins, and/or regional ponds.

This page is organized into pretreatment practices (which are required for many structural BMPs), permanent practices as discussed in the Construction Stormwater Permit, and other practices.

Permanent practices

1. Infiltration/filtration practices
   1. Bioretention (rain garden) (+)
   2. Infiltration basin (+)
   3. Infiltration trench (+)
   4. Permeable pavement (+)
   5. Tree trench/tree box
   6. Swales
   7. Sand filters
   8. Iron enhanced sand filter (Minnesota Filter) (+)
   9. Green roofs (+)
   10. Stormwater re-use and rainwater harvesting
2. Wet sedimentation basin and regional ponds
   1. Stormwater ponds (+)
   2. Stormwater wetlands (+)

Other practices

1. Pollution prevention
   1. Better site design
   2. Hydrodynamic devices (also see Pretreatment
   3. Filtration devices (also see Pretreatment
   4. Street sweeping
   5. Education
   6. Road de-icing
   7. Yard waste management

To view all pages for a particular BMP, click on "+"