Soak up the Rain Webinar: Dissolved Phosphorus and Green Infrastructure: Fundamentals, Challenges, and Opportunities
Reducing phosphorus pollution in aquatic ecosystems is a primary goal in many watersheds across the United States to mitigate eutrophication and harmful algal blooms. Several forms of green infrastructure can effectively reduce loads of total phosphorus to surface waters through the retention of particles and associated phosphorus. Retention of dissolved phosphorus has proven to be more challenging, and in some cases poor retention of dissolved phosphorus, or even net dissolved phosphorus release, can compromise phosphorus load reduction goals. Furthermore, limited overall capacity to retain dissolved phosphorus in green infrastructure systems can potentially result in declining performance over time.
In this webinar, Eric Roy will discuss the fundamental biogeochemistry underpinning dissolved phosphorus dynamics in green infrastructure and highlight key mechanisms that control both dissolved phosphorus retention from water and release to water. Drawing on literature and recent research in Vermont, this presentation will address the challenge that dissolved phosphorus poses to water quality improvement efforts, opportunities to better manage dissolved phosphorus and enhance green infrastructure performance (including amendment of soil media with drinking water treatment residuals), and the use of phosphorus metrics to inform green infrastructure design. This webinar will include examples of green infrastructure at multiple scales, including urban green stormwater infrastructure (e.g., bioretention and subsurface gravel wetlands) as well as larger ecosystem-scale systems (e.g., restored riparian wetlands).
• Eric D. Roy, PhD, Associate Professor at Rubenstein School of Environment and Natural Resources & Department of Civil and Environmental Engineering, University of Vermont