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Why do the requirements focus on 1-year and 2-year, 24-hour storms?

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The calculations for this credit are always a headache! While our projects are usually awarded the credit, the equations in the LEED Reference Guide are helpful mostly for sizing a reservoir or cistern, but don't help you get to the final results. Does US

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

BMPs in series

Profile picture for user tristanroberts
Tristan Roberts
Representative
Vermont House of Representatives
LEEDuser Expert
7780 thumbs up

I heard a comment from a LEED user that GBCI reviewers do not understand the application of Best Management Practices in series.

Has anyone seen this on LEED reviews, and how have you dealt with it?

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Michael DeVuono
Regional Stormwater Leader
Arcadis North America
LEEDuser Expert
144 thumbs up

Wed, 01/30/2013 - 15:27

I have not heard this, but I can emphasize that a train of 50% removal>30% removal will not satisfy this credit. Hypothetical ... sinple drainage area (this get very complex with multiple areas) 100 lbs TSS generated by our runoff volume. We need to remove 80 lbs of TSS. Runoff volume routed through BMP with 50% removal efficiency. 50 lbs removed, 50 lbs remain. Next in series is a BMP with 30% removal efficiency 15 lbs of the remaining 50 lbs is removed. 65 lbs<80 lbs

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