Urban Stormwater Retrofits

Over the last two decades, the Chesapeake Bay states have pioneered new techniques for finding, designing and delivering retrofits to remove pollutants, improve stream health and maintain natural hydrology in developed watersheds. Several important regulatory drivers are likely to increase the amount of future stormwater retrofit implementation across the Chesapeake Bay watershed.  Some communities need to install retrofits to meet pollutant reduction targets under recently issued municipal stormwater permits or meet local TMDLs.  In addition, each of the seven Bay states are considering greater use of urban stormwater retrofits as part of an overall strategy to meet nutrient and sediment load reduction targets for existing urban development under the Chesapeake Bay TMDL.

In the Fall of 2011, an Expert Panel was convened to review all of the available science on the pollutant removal performance and runoff reduction capability of BMPs that can be used to derive methods or protocols to derive nutrient and sediment removal rates for individual retrofits. On October 9, 2012 the final recommendations were approved by the Water Quality Goal Implementation Team! The recommendations with or without appendices can be found below. Great job to the panelists!!

Also, don’t forget to check out our newly developed Urban Stormwater Retrofits “Fact Sheet” which breaks down the practice and the expert panel recommendations into delicious bite-size pieces …yum, yum, enjoy!

U-1 Urban Stormwater Retrofits Fact Sheet

A 'fact sheet' on using Urban Stormwater Retrofits as a BMP in the Chesapeake Bay Watershed.

Version june 2015 | Size (681 KB) | File type (.pdf) | Download

Urban Stormwater Retrofits Final Report(s)

Final CBP Approved Expert Panel Report on Stormwater Retrofits (Short Version)

Final CBP Approved Expert Panel Report on Stormwater Retrofits Short Version. To see the long version go here.

Version short, january 20, 2015 | Size (1 MB) | File type (.pdf) | Download

Final CBP Approved Expert Panel Report on Stormwater Retrofits (Long Version)

Final CBP Approved Expert Panel Report on Stormwater Retrofits Long Version

Version long, january 20, 2015 | Size (2 MB) | File type (.pdf) | Download

Frequently Asked Questions for Stormwater Performance Standards and Retrofit Expert Panel Reports

This is a companion document to the expert panel reports on on the retrofit and performance standards expert panel reports that clarifies how the practices will be credited, identifies who the state stormwater contacts are, outlines the reporting and tracking requirements for NEIN and Scenario Builder, corrects errata, and provides any state-specific decisions/interpretations on how the reports are to be properly used.

Version may 25, 2015 | Size (521 KB) | File type (.pdf) | Download

Training Resources

The following training resources have been created for explaining the panel recommendations – enjoy!

MS4 Implementers and the Bay TMDL: Urban Stormwater Retrofits and Urban Filter Strips Frequently Asked Questions Webcast

Archive of the webcast MS4 Implementers and the Bay TMDL webcast on Urban Stormwater Retrofits and Urban Filter Strips Frequently Asked Questions from September 4, 2014

Version september 4, 2014 | Open link in new window

Urban BMPs and the Bay TMDL: A Users Guide – Urban Stormwater Retrofits

Archived webcast on the Urban Stormwater Retrofits as part of the Urban BMPs and the Bay TMDL series held at the 2013 Bay-wide Stormwater Retreat in Shepherdstown, WV in April 2013.

Version april 2013 | Open link in new window