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CS-2009 SSc6.1:Stormwater Design—Quantity Control

Runoff rate and runoff volume definition

Michael, Our local regulations usually require rainwater collection facilities that only shift the total runoff between storms instead of infiltrating or reusing the rainwater. Is there a common accepted definition of runoff quantity that in relation to the time period (during the rainstorm OR during and after the rainstorm)? Thank you.

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Profile picture for user Mike Dee
Michael DeVuono
Regional Stormwater Leader
Arcadis North America
LEEDuser Expert
144 thumbs up

Tue, 10/27/2015 - 02:01

I'm sorry I don't think I understand your question.

Wed, 10/28/2015 - 00:49

Let me reformulate the question: A zero lot line building with no rainwater infiltration or reuse pursues case 2 for SSc6.1 by storing the rainwater on a tank and releasing the rainwater into the city's sewers gradually after the rainstorm. If we define runoff as "runoff during the storm", the runoff would be: total rainwater - tank's capacity If we define runoff as "runoff during and after the storm", the runoff would be total rainwater.
Profile picture for user Mike Dee
Michael DeVuono
Regional Stormwater Leader
Arcadis North America
LEEDuser Expert
144 thumbs up

Wed, 10/28/2015 - 11:32

You do not meet. You need to reduce quantity (volume) by 25%. You may be reducing "rate" with your approach but the volume is the same.

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