This is a volume-based method that has been popularized by the Center for Watershed Protection via several state-wide SWM Design Manuals (Georgia, Maryland, New York, Rhode Island, & Vermont).

Runoff Frequency Spectrum (RFS) is a method of determining Water Quality Treatment Volumes (WQv), which is the volume of stormwater runoff to be treated in the bioretention facility.  The RFS Method is based on a site's percentage of impervious area. 

Bioretention filter bed sizing is hydraulics-based and is from Darcy's Law.   

The computations shown here are from the TSA TOOLS Bioretention Module.  Click here to go to the Design Software pages.

CONTINUE TO IMPERVIOUS AREA METHOD

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The information on this website was compiled by T.E. Scott & Associates, Inc. from various sources.

We make no guarantees or warranties to the applicability of this material to specific applications. 
Last modified: 10/23/09