Pervious concrete to drainage

Omar Elrawy

Green Building Consultant | Researcher

GreenA Consultants

LEEDuser Basic Member

38 thumbs up

February 27, 2023

Hi,

Can we comply by using pervious concrete, knowing that the water will not be collected, will just be discharge to perimeter drain?
Also for roof collected rainwater, we need to size the tank to hold the water for how many days?

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Dave Hubka

Practice Leader - Sustainability

EUA

LEEDuser Expert

510 thumbs up

Thu, 03/02/2023 - 04:59

rainwater that is considered "compliant' must be managed onsite. meaning that if it ever leaves the site then it is no longer 'compliant'. Permeable/Pervious paving is a compliant low-impact development strategy. But if the water that flows through pervious paving ends up in the perimeter drain and leaves the site, then it is no longer a compliant strategy.

Afogreen Build

www.afogreenbuild.com

Green Building Consultant

LEEDuser Premium Member

249 thumbs up

Thu, 07/27/2023 - 01:23

Hi Omar, No, it no longer complied if the water will eventually be discharged to perimeter, as the requirement is to manage runoff on-site for both option 1 and 2.
You have to size it according to how you can manage or use the rainwater on site. Best regard – Afogreen Build Team

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