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##[[Permeable pavement|Permeable pavement with no underdrain]] ([[Permeable pavement combined|+]]) | ##[[Permeable pavement|Permeable pavement with no underdrain]] ([[Permeable pavement combined|+]]) | ||
##[[Trees|Tree trench/tree box with no underdrain]] | ##[[Trees|Tree trench/tree box with no underdrain]] | ||
+ | ##[[Dry swale (Grass swale)]] ([[Dry swale (grass swale) combined|+]]) | ||
+ | ##[[High-gradient stormwater step-pool swale]] | ||
##[[Stormwater re-use and rainwater harvesting|Stormwater re-use and rainwater harvesting - captured water routed to one of the above BMPs]] | ##[[Stormwater re-use and rainwater harvesting|Stormwater re-use and rainwater harvesting - captured water routed to one of the above BMPs]] | ||
#Filtration practices - these practices typically achieve little or no infiltration but can be designed to provide some infiltration. Examples include BMPs with a raised underdrain and swales with check dams or a bioretention base. | #Filtration practices - these practices typically achieve little or no infiltration but can be designed to provide some infiltration. Examples include BMPs with a raised underdrain and swales with check dams or a bioretention base. |
Post-construction Best Management Practices (BMPs) are the BMPs that exist following construction of 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.
NOTE: Not all the practices indicated below can be used to meet the Construction Stormwater General Permit. The 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 (which do not qualify for meeting requirements of the construction permit).
To view all pages for a particular BMP, click on "+"