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NC-2009 SSc6.1:Stormwater Design—Quantity Control

Gravel Roads as BMPs

Hi Everyone, A project I'm working on is factory on a rural setting. All roads and parking lots are gravel. Does this account as pervious paving? I'm certain it should, and it should count towards reducing peak discharge (as opposed to a paved road) and also as a water quality BMP. Am I right? Thanks!

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

Mon, 10/14/2013 - 12:51

In regards to 6.1, you are really only worried about the CN for gravel, which is between 76-91 depending on the underlying soil. The lower CN (as opposed to 98 for impervious) will result in lower discharge rates and volume, this is the fundamental concept behind SWM. A water quality BMP is a feature that treats your surface runoff, a gravel road by itself is not treating anything, especially if it exists in the pre-development. You could do a trench under your parking lot, but without paving above you will have no structural support for vehicles.

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