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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?

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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

Option 2 Percentile Rainfall Event

I am trying to document a project under option 2 for this credit for a zero lot line project. Does anyone know what objective data compliance for this option is based on? Do we have to be able to keep all of the 85th percentile rainfall event on site through storage, vegetated roof or some other design strategy? OR Do we just have to document the strategies that we are using? Any experience that can be shared would be greatly appreciated. Thanks!

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

Fri, 01/17/2014 - 17:35

You need to have your CE document that you are not blowing out the receiving channel's capacity or causing an erosive condition due to increased velocity and rate. Look below for a more detailed response.

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