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FAQs about SSc6.1 :

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?

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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 SSc6.1:Stormwater Design—Quantity Control

runoff coefficient

Eric Yao

LEEDuser Basic Member

3 thumbs up

February 10, 2011

what the value of runoff coefficient for gravel area (2% gradient)?

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Amy Rider

Sustainability Manager

KEMA Services

LEEDuser Basic Member

110 thumbs up

Wed, 02/16/2011 - 20:22

While this is somewhat dependent on the design (material thickness, subgrade permeability, etc), 0.5 is a good rule of thumb for low slope gravel areas.

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