When? Thursday, 20 October 2016, 12:00 pm EDT - 1:30 pm EDT
Cost: FREE

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Dave Hirschman, Hirschman Water & Environment, LLC
Bryan Seipp, Center for Watershed Protection

View Archived Webcast & Resources

Can we get more reductions from our stormwater BMPs? We all know that in the Chesapeake Bay stormwater BMPs that are built to the Bay state design specs are credited with removing nutrients and sediment based on the amount of runoff treated per impervious cover …but what if we can tweak the designs of BMPs to remove more of one pollutant or another?

iws-schematic2This webcast will cover a recent literature review conducted by the Chesapeake Stormwater Network, the Center for Watershed Protection and Hirschman Water & Environment, LLC which looked at what enhancements can be done to improve the removal of nutrients by stormwater BMPs.

To understand the influence of PEDs, it should be understood that bioretention – and several other stormwater BMPs – have done an admirable job of removing particulate forms of phosphorus (P) and nitrogen (N), and steady improvement has been made in pollutant removal performance. However, dissolved forms of both P and N have lagged behind in terms of effective removal mechanisms. This has been a concern, since dissolved nutrients can constitute a sizable fraction of total urban loads, and the dissolved forms may be more bioavailable in downstream receiving waters than the particulate-bound forms left behind in the BMPs. A strong focus of more recent research has been on how to effectively reduce the fuller spectrum of nutrients, including both particulate and dissolved forms.

Webcast Archive

Listen to Archived Webcast

The Potential to Enhance Nutrient Removal in Bioretention and Sand Filters Presentation

The slides from the webcast The Potential to Enhance Nutrient Removal in Bioretention and Sand Filters which aired on October 20, 2016

Version october 20, 2016 | Size (4 MB) | File type (.pdf) | Download

Webcast Resources

Performance Enhancing Devices for Stormwater Best Management Practices

The draft version of the Technical Support Document developed on June 1, 2016 which focuses on the ability of PEDs to provide incremental removal of urban nutrients compared to existing practice design. Examples of PEDs include adding amendments to filter or bioretention soil media, providing an “internal water storage” zone, and enhancing the selection and management of vegetation.

Version june 1, 2016 | Size (609 KB) | File type (.pdf) | Download


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