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NC-2009 SSc6.2:Stormwater Design—Quality Control

Reduction of impervious area

I have a project where we are promoting infiltration by installing permeable pavers for a portion of the pavement, and we are capturing and treating runoff from 90% of the average annual rainfall event, however we are increasing the total impervious area from the existing conditions. Can I still meet this credit? We are removing 80% TSS for all runoff from the site.

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Profile picture for user Mike Dee
Michael DeVuono
Regional Stormwater Leader
Arcadis North America
LEEDuser Expert
144 thumbs up

Thu, 02/05/2015 - 15:46

In short yes, you are good. Reducing impervious surface is one of the ways to improve water quality, but not an actual requirement for this credit. Just calculate a runoff volume using the 90% annual rainfall event, treat that volume for 80% TSS removal.

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