Will rainwater harvesting prevent compliance with this credit?
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NC-v4 SSc4: Rainwater management
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Rainwater harvesting
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Tristan Roberts
RepresentativeVermont House of Representatives
LEEDuser Expert
11478 thumbs up
April 28, 2014 - 9:37 pm
No—was there any reason you thought that it would?
Erin Holdenried
Sustainability Architect125 thumbs up
April 29, 2014 - 10:18 am
(dislamer: I am an architect, not a civil engineer. So I only have a basic understand of stormwater management). The v4 language refers to replicating natural hydrology. Which, in my mind, is very different from v2009 that requires reduction in quantity and increase in quality. My thought was that by collecting rainwater, say for toilet flushing, one would be reducing the amount of water that might naturally infiltrate into the ground; and thus, prevent the restoration of natural hydrology. We have a project in maryland where we actually could not capture as much rainwater as we would have liked, because code dictated a certain amount of stormwater must be allowed to infilrate and runoff, as it would on a natural site.
Michael DeVuono
Regional Stormwater LeaderArcadis North America
LEEDuser Expert
187 thumbs up
April 29, 2014 - 10:56 am
The science behind using the 95th percentile storm as your design storm, and capturing this runoff from the developed condition is thought to most likely replicate the natural hydrology of a site.
Every site is different, and local rules and regs will always come into play. In your case above, without knowing the particulars, there is always a fine line between replicating natural hydrology, and destroying it via flooding (too much runoff), or drying it up (too little). I'm guessing in your case, the local reviewer felt that you would be diverting too much flow, therby limiting the ability of the receiving stream to support the existing aquatic life, bio diversity, etc.