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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 SSc6.1:Stormwater Design—Quantity Control

Discharge rates and run off

Sean Hogan

LEED AP

RKD Architects

LEEDuser Basic Member

1 thumbs up

July 29, 2013

Hi, In simple terms, is there a difference between 'discharge rate' and 'run off'? We are currently assessing our site to determine which case and path to follow. Discharge rate is the terminology used in case 1 option 1, run off is used in case 2. Thanks, Sean

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Michael DeVuono

Regional Stormwater Leader

Arcadis North America

LEEDuser Expert

144 thumbs up

Mon, 07/29/2013 - 16:19

Run off is simply describing the stormwater that "runs off." Stormwater runs off with a rate (cf/sec), and a quantity or volume (cf).

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