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FAQs about SSc6.2 :

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

Why include the 1-year storm in the credit requirements? Won't management practices for the 2-year storm be effective?

How can green roofs count as a stormwater control measure?

How can I achieve compliance if my project's stormwater control measures are outside the LEED project boundary?

I have 100-year data—how do I convert to 2-year?

Is it an acceptable strategy to capture the rainwater into tanks and discharge it into the public sewers after the rainstorm reducing the peak discharge?

Are there special considerations for international projects?

What performance threshold do I need to achieve for an Exemplary Performance point?

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

LEED Boundary

I would like to know what determines the site boundary for capturing the 90% anual rainfall total. Does the treatment area have to be the entire site boundary?

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Nadia Ayala
Architect / LEED AP BD+C
KILTIK Consultoría
LEEDuser Basic Member
36 thumbs up

Thu, 04/18/2013 - 21:12

Hi Antwon, Yes, you have to consider the entire LEED boundary to perform your calculations. You have to take into account what kind of surfaces are there in your site and their runoff coefficients, and make your calculations in proportion to the area covered by each type of surface.

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