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**[[Calculating credits for bioretention]]
 
**[[Calculating credits for bioretention]]
 
**[[Calculating credits for green roofs]]
 
**[[Calculating credits for green roofs]]
**[[Calculating credits for infiltration basins]]
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**[[Calculating credits for infiltration basin]]
 
**[[Calculating credits for permeable pavement]]
 
**[[Calculating credits for permeable pavement]]
 
**[[Calculating credits for tree trenches and tree boxes]]
 
**[[Calculating credits for tree trenches and tree boxes]]
 
**[[Calculating credits for stormwater ponds]]
 
**[[Calculating credits for stormwater ponds]]
 
**[[Calculating credits for stormwater wetlands]]
 
**[[Calculating credits for stormwater wetlands]]
**[[Calculating credits for sand filters]]
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**[[Calculating credits for sand filter]]

Revision as of 13:59, 18 May 2015

Schematic showing pollutant load reductions for infiltrated and filtration in Bioretention basin (with an underdrain)
Schematic showing how pollutant load reductions are calculated for Bioretention basin (with an underdrain).

Credit refers to the stormwater runoff volume or pollutant reduction achieved toward meeting a runoff volume or water quality goal. Examples of goals include meeting the 1 inch volume reduction requirement in the Construction Stormwater General Permit and meeting TMDL pollutant reduction requirements. Credits can be achieved either by an individual BMP or cumulatively with multiple BMPs.

The following pages provide information on stormwater volume and pollutant credits, pollutant removal achieved by individual BMPs, methods for calculating volume and pollutant reductions (credits), and example calculations.