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

What is the acceptable testing standard for runoff coefficient.

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Panupant Phapant
SCG Cement - Building Materials
LEEDuser Basic Member
13 thumbs up

Dear All We are the construction materials manufacturers. We wish to determine the runoff coefficient for our porous concrete product. Can anyone advise what is acceptable testing stadard for defining the runoff coefficient for porous concrete product that can be adopted for the storm water run off evaluation as per the requirements of SSc6.1 and SSc6.2, LEED NC Version 2009. Thank you

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Michael DeVuono
Regional Stormwater Leader
Arcadis North America
LEEDuser Expert
144 thumbs up

Mon, 03/30/2015 - 19:01

I typically use the underlying cover type ...... just pretend the porous isn't even there. You could always bump the CN up a little bit to be conservative.
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Panupant Phapant
SCG Cement - Building Materials
LEEDuser Basic Member
13 thumbs up

Tue, 03/31/2015 - 15:19

Dear Michael Thank you for your advise. Pleas let me confirm my understanding. Do you suggest that the runoff coefficient of the porous concrete can be ignored and we use the runoff coefficient of the substance lay beneath the porous concrete for the storm water runoff calculation.
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Michael DeVuono
Regional Stormwater Leader
Arcadis North America
LEEDuser Expert
144 thumbs up

Tue, 03/31/2015 - 18:07

There is no hard and fast guidance to this, but this has been the trend in stormwater modeling recently.
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Panupant Phapant
SCG Cement - Building Materials
LEEDuser Basic Member
13 thumbs up

Thu, 04/16/2015 - 01:53

Dear Michale Thank you very much for your clarification

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