SS C6.1 has two cases:
Case 1: Sites with existing imperviousness 50% or less: Requires proposed runoff not exceeding the existing runoff.
Case 2: Sites with existing imperviousness greater than 50%: Requires proposed runoff 25% decrease from the existing runoff.
If I use the current site condition, which puts us under Case 1, but we won't be able to meet the existing runoff.
However, our site was once a bus depot which was mostly impervious. The building and majority of the pavement was removed around 2001. If we can use the pre-existing site, we may be able to reduce the runoff to be no more than 25% of the pre-existing condition.
Has anyone used the pre-existing condition for this credit?
Thanks!
Michael DeVuono
Regional Stormwater LeaderArcadis North America
LEEDuser Expert
186 thumbs up
July 27, 2016 - 3:36 pm
If you are going to try that approach, as the Devil's Advocate I am going to say "before it was a bus depot is was a meadow, model it that way."
You need to be able to pass a straight-face test. Your approach, in my opinion, is nothing more than an attempt to game the system.
What kind of BMPs have you looked at in an effort to comply?