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FAQs about SSc6.1 :

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?

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

No 2-year, 24 hour design storm data available

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Mario S.
LEEDuser Basic Member
26 thumbs up

The 2 year, 24-hour design storm precipitation data is unavailable for the country. However, Historic rainfall data exists. Using that data, we will calculate the maximum runoff rate and subsequently try to manage the entire rainwater the site is receiving through draining the stormwater into the natural cavities found on our site and these cavities will act as natural percolating tanks. We are aware that the capacity of water absorption of these cavities should be tested. However, assuming that the cavities are enough to receive the runoff water volume. Would that make us compliant with the credit intent?

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Michael DeVuono
Regional Stormwater Leader
Arcadis North America
LEEDuser Expert
144 thumbs up

Wed, 05/10/2017 - 11:26

Make sure you clearly document your methodology for determining the rainfall depth.
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Mario S.
LEEDuser Basic Member
26 thumbs up

Fri, 05/12/2017 - 06:39

We will use local data showing the monthly average precipitation in (mm), from that table we will chose the month showing the highest precipitation level and we will design accordingly.

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