when calculating the volume of sediment basin, what is the drainage area? Should I use footprint of the building or total land area of LEED boundary?
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Michael DeVuono
Regional Stormwater LeaderArcadis North America
LEEDuser Expert
187 thumbs up
June 9, 2016 - 1:11 pm
If you are trying to figure out the required storage volume for a sediment basing, this has nothing to do with LEED boundaries or building footprints, it needs to hold the runoff that drains to it, and slowly release it (usually over the course of 7+ days). I like to use 3600 cf/ac as a starting point.
Hongyun Zhou
June 10, 2016 - 9:15 am
When you calculate the runoff, should I use 2 year frequency stormwater for 24 hours multiply by certain area? I wonder what area this refers to? Even use 3600cf/ac method, what area it refers to?
Michael DeVuono
Regional Stormwater LeaderArcadis North America
LEEDuser Expert
187 thumbs up
June 10, 2016 - 9:31 am
You're not calculating runoff. You are providing volume. 3600 cf per acre that drains to the sed basin
Hongyun Zhou
June 12, 2016 - 5:54 am
Thanks for the input. I am afraid that I did not get it thoroughly. When you calculate the volume of sed basin, do you use 3600 cf per acre? If so, what area the acre refers to?
Ward Miller
Chief Environmental OfficerAlpenglow Advisory
64 thumbs up
February 12, 2018 - 5:06 am
The 3600 cf/ac is an orientation Michael has provided for you to calculate how much volume would be needed to use on your site. The area you are asking about should be the size of the LEED Project Boundary, as this is the area that you need to drain during construction. You are essentially providing a buffer or a series of buffers to reduce sediment loss from your site. In terms of the rainfall you should use, the 2year/24hr design storm would be sufficient, but LEEDv2009 does not require a specific rainfall quantity to be used, as your contractor and civil engineer should already have done this based on local norms.