See all forum discussions about CS-2009 SSc6.1
 Subscribe to new posts about CS-2009 SSc6.1 Post a new question aboutCS-2009 SSc6.1
See LEEDuser’s guidance on CS-2009 SSc6.1»
FAQs about SSc6.1 :

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?

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

View answers »

Forum discussion

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

Low Anual Rainfall Average

Default Avatar
Ron Dean
Sumac Inc.
LEEDuser Basic Member
20 thumbs up

Our project is located in a city with a very low annual rainfall average (8.3mm that is about 0.327 inches per year). The project will have a green roof in about 60% of the roof area. It is possible to direct the slopes of the other 40% of impervious area of the roof to the green roof. These will be sufficient to control runoff from all the rain water. It is possible to apply to the credit under these conditions. Thanks.

0
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

Tue, 08/06/2013 - 12:38

This is a very common practice. I will typically try to put the 60% green in the middle, with the outer edges directed inward. I let the actual roof designer work out the details, but from a stormwater approach, that is how I go at it.

Add new comment

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