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
PrincipalEmerald Built Environments
1297 thumbs up
July 29, 2011 - 10:44 am
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... 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.