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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

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

pre-development / post-development

Doreen Kruschina

Doreen Kruschina Planung+Baumanagement

LEEDuser Basic Member

1 thumbs up

November 6, 2013

Sorry, might be a stupid question: in our case the pre-development is a demolished building complex. Do we calculate the post-development against the previous development or the undeveloped conditions? Thanks

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Michael DeVuono

Regional Stormwater Leader

Arcadis North America

LEEDuser Expert

144 thumbs up

Wed, 11/06/2013 - 17:01

As far as LEED goes, your pre-development is based on what is on the ground right now, before you start construction. However, check with your local regs, as well as NPDES requirements, which usually make you take a portion or all of existing impervious or other cover types back to meadow.

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