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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?

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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

Case 2 Site with little decrease in Impervious Ratios

I am in the processing of accessing the feasibility of attaining this credit with a site that is currently 88% impervious and the proposed site is roughly 81% impervious. While i will be able to show a slight reduction in site runoff via a retention swale (+/- 4%), i am wondering if an exfiltration system would be a means of achieving the additional runoff decrease. I know this goes against the standard runoff reduction calculations, but has this credit been achieved via structured stormwater system?

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Susann Geithner
Principal
Emerald Built Environments
LEEDuser Basic Member
900 thumbs up

Fri, 07/29/2011 - 14:44

We had an infiltration system to reduce the storm water runoff to zero for two projects with very limited site area. Here is a link to a similar system. http://www.intewa.com/drain_max_tunnel_infiltration_ditch_system_1258504.html not sure if that's what you are planning on using, but you can install these system under neath the surface parking. It's pretty much common practice in Europe.

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