Use of Section 438 for Option 1 Path 1

Suzanne Johnson

Design Manager

Hensel Phelps

LEEDuser Basic Member

0 thumbs up

April 28, 2014

It is our understanding that Section 438 is used only to define the 95th percentile and that there is no requirement to follow Section 438 in full. Please confirm this understanding. Thank you, Suzanne Johnson Hensel Phelps

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Michael DeVuono

Regional Stormwater Leader

Arcadis North America

LEEDuser Expert

144 thumbs up

Tue, 04/29/2014 - 12:37

Suzanne, EPA 438 will outline the procedures for data collection and the methodology to determine the 95th percentile storm for your project. You must follow this methodology. Section 438 outlines a few options to replicate pre-development hydrology, which are in line with the v4 Reference Guide, specifically Option 1, to manage the 95th percentile storm. Basically, determine the 95th percentile storm, apply that storm to the post-development condition, and manage that runoff volume on-site with some form of BMP. Is there something specific you are not sure about with the credit or 438?

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Use of Section 438 for Option 1 Path 1

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