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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

How to show 100% Infiltration

Our project is the only development on a small, flat, island. The surface is sand or sandy topsoil and is extremely porous. After development, the only impervious surfaces will be roofs, some of which will harvest rainwater. Rainfall from the other roofs will infiltrate naturally into the sand. There is no runoff into the surrounding lagoon as all rainfall infiltrates into the water table. Given that no specific stormwater design is needed, will it be sufficient for documentation to show that 100% infiltration remains post development? Thanks

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Amy Rider
Sustainability Manager
KEMA Services
LEEDuser Basic Member
110 thumbs up

Wed, 03/02/2011 - 23:19

Yes, 100% on site infiltration is an acceptable means to obtaining this credit. The reviewers will likely want to see some calculations or supporting documentation showing that the soil types and grading can adequately infiltrate the additional rainwater from the impervious surfaces that aren't being captured, but this shouldn't have to be very extensive. Be sure to describe your rainwater harvesting system as well to further support your claim.

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