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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?

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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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Forum discussion

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

Rainfall Rates in Inches

Ian McCall

Environmental Engineer

LEEDuser Basic Member

11 thumbs up

Project location :

February 12, 2016

Dear LEEDers, Can someone confirm that a rainfall of 1 inch per 24 hours is 1 inch per 1 inch squared of ground surface? Thank-you, Ian

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Michael DeVuono

Regional Stormwater Leader

Arcadis North America

LEEDuser Expert

144 thumbs up

Fri, 02/12/2016 - 16:57

An inch of depth is an inch of depth across any surface. So in your scenario you would have 1 in^3 Check your units, most likely the units are 1-inch/hour for a 24 hour duration. An inch in 24 hours would be 1/24-inch/hour for a 24-hour duration.

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