IC Disconnection

While numerous practices that effectively disconnect impervious cover have been evaluated through the Urban Stormwater Workgroup’s (USWG) Expert Panel Process (e.g., urban filtering practices, urban filter strips, runoff reduction practices, etc.), using soils that have been modified to enhance their runoff reduction capabilities had not previously been one of them.

Now, a recently released report details how directing or otherwise spreading stormwater from impervious cover of existing development to an acceptable area of amended soils can help communities meet their Bay Pollution Diet goals.

The report, coordinated by Virginia Tech and developed by a panel of stormwater experts from around the country, details how to calculate the pollution reduction credit as well as how to track and report the new BMP.

This is a promising new runoff reduction technique. We encourage you all to download the Expert Panel report below, and listen to CSN’s March 2017 webcast on the new practice!


Expert Panel Report

Recommendations of the Expert Panel to Define Removal Rates for Disconnecting Runoff from Impervious Areas onto Amended Soils or Treatment in the Stormwater Conveyance System

Impervious Cover Disconnections to Amended Soils Expert Panel Report: Full Report.

Version april 12 2017 | Size (4 MB) | File type (.pdf) | Download

Training Resources

[Webcast] New Crediting Approaches: Impervious Cover Disconnection and CMAC