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NC-2009 SSp1:Construction Activity Pollution Prevention

Sediment Basin

Hello again, we are working on a project for which we are installing a sediment basin. According to EPA we could use the calculation of 3600 ft3 / acre drained to size it. Most of the drainage area will remain undisturbed since it will be a preserved area. Diverting the water from undisturbed areas is quite difficult because of topographical constraints. We found in a manual that from undisturbed areas, we could use a runoff value of 500 ft3/acre drained in addition to the 3600ft3/acre drained of disturbed areas. Would doing this be compliant with EPA's regulations? We are outside the US and not very familiar with these regulations. Thanks!

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Profile picture for user Mike Dee
Michael DeVuono
Regional Stormwater Leader
Arcadis North America
LEEDuser Expert
144 thumbs up

Thu, 10/16/2014 - 14:52

All I have ever seen or used is 3600 cf/ac or 5000 cf/ac for high quality watersheds. Compost filter socks can be installed in virtually any terrain, and used for diversion. Have you considered these?

Thu, 10/16/2014 - 15:17

Thanks Michael, here is where we found the reference to the 500 ft3/acre drained from undisturbed areas: http://www.udfcd.org/downloads/pdf/critmanual/Volume%203%20PDFs/chapter%207%20fact%20sheets/SC-07%20Sediment%20Basin.pdf We live in a place where things as compost filter socks are not commercially found, so practically any diversion would have to be made doing earthwork, which we are trying to avoid. The site where the basin would stand is also constrained and almost not enough to divert 3600 ft3/acre from all areas. Do you think we would comply using 500cf/ac in undisturbed areas?

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