See all forum discussions about CS-2009 SSc6.2
 Subscribe to new posts about CS-2009 SSc6.2 Post a new question aboutCS-2009 SSc6.2
See LEEDuser’s guidance on CS-2009 SSc6.2»
FAQs about SSc6.2 :

How can I achieve compliance if my project's stormwater control measures are outside the LEED project boundary?

I have 100-year data—how do I convert to 2-year?

Is it an acceptable strategy to capture the rainwater into tanks and discharge it into the public sewers after the rainstorm reducing the peak discharge?

Are there special considerations for international projects?

What performance threshold do I need to achieve for an Exemplary Performance point?

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

Why do the requirements focus on 1-year and 2-year, 24-hour storms?

Why include the 1-year storm in the credit requirements? Won't management practices for the 2-year storm be effective?

How can green roofs count as a stormwater control measure?

View answers »

Forum discussion

CS-2009 SSc6.2:Stormwater Design—Quality Control

Water Quality

Lets say the 90% runoff volume for the project area is 10,000 c.f. If only 50% of the project area drains to the bmp which is designed to treat 10,000 c.f. at 100% efficiency but only 7,900 c.f. out of the 10,000 c.f. drain to the bmp, am I correct that this would be insufficient to earn this credit?

2
Post a reply

You rely on LEEDuser. Can we rely on you?

LEEDuser is supported by our premium members, not by advertisers.

Go premium for $15.95  »

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

Fri, 02/12/2016 - 17:05

You need to do your model based of the numbers they give you in the footnotes of the credit, which are dependent on your region. Use that to generate a runoff volume, that is what you need to treat. Make sure this is what you did. But you are correct, if you need to treat 10,000 cf, and 10,000 cf of runoff doesn't get to your BMP you will not comply. You can not simply provide 10,000 cf of volume and take credit for the hole you made if nothing gets to the hole. Try piping or adjusting grading to get more to the BMP.

Add new comment

To post a comment, you need to register for a LEEDuser Basic membership (free) or login to your existing profile.