Forum discussion
NC-2009 SSc6.1: Stormwater Design—Quantity Control
Dear all,
Our project design stormwater combine 2 options:
1. For stormwater runoff at the ground surface, we can decrease 25% by installing pervious pavement (like hole brick...)
2. For stormwater from the top roof, we will collect by a piping system, and connect this piping to public drainage system, don't let this source to runoff above ground surface.
So, if we design like that, can we achieve this credit requirements, under CASE 2?
Thanks so much for your helping.
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Tristan Roberts
RepresentativeVermont House of Representatives
LEEDuser Expert
11474 thumbs up
July 12, 2010 - 8:26 pm
Fabio, your first option works for this credit, but the second option does not. The intent of the credit is to mitigate stormwater onsite, not to let it runoff into local streams or to a public drainage system (which probably discharges to local streams).It took me a couple minutes to find a LEED reference that would clearly support my opinion here. It is very clearly implied on page 92 of the LEED BD&C Reference Guide, under "economic issues."
Yoyo Shek
Allied Environmental Consultants Limited4 thumbs up
March 10, 2014 - 4:17 am
I am having same question here. In which, I have some projects could achieve this credit by connecting the catchment water (from the site) to the Gov drainage system. On the other hand, I see some of the projects in my company fails by using same approach.
If refer to page 94 of the LEED BD&C Reference Guide, under "master Site Development consideration", it seems LEED accept the connection to Gov drainage system to earn the credit.
Please discuss.
Michael DeVuono
Regional Stormwater LeaderArcadis North America
LEEDuser Expert
186 thumbs up
March 10, 2014 - 9:24 am
You can "connect" and ultimately discharge wherever your local jurisdiction allows you to do so, but you need to reduce the rate and volume before the runoff leaves your site.
A "master site" or regional stormwater basin would have had to be designed to account for the development of your site, and therfore mitigate its impact. You can not just let runoff discharge uncontrolled from your site, to some downstream basin that was not designed to handle your development.
Yoyo Shek
Allied Environmental Consultants Limited4 thumbs up
March 12, 2014 - 12:18 am
Thanks.
My region has a mechanism to "approve" if the site could connect its run-off water to public drainage. We need to demonstrate the stormwater due to our site could be "handled" by the public drainage, until to discharge to the sea by calculation. Apparently there will be no problem for all downstream.
As a result, we shall have (i) no surface runoff & (ii) the Gov drainage system is capable to handle the amount of stormwater.
How do you think of such?
Michael DeVuono
Regional Stormwater LeaderArcadis North America
LEEDuser Expert
186 thumbs up
March 12, 2014 - 7:19 am
On the surface I feel this does not meet the intent of the credit; however, with the right supporting documatation that shows the methodology to which the regional system was designed you may be able to make a case.
You will probably just have to submit, and see what happens.
Yoyo Shek
Allied Environmental Consultants Limited4 thumbs up
March 12, 2014 - 9:48 pm
Thanks Michael!