How Effective are Subsurface Gravel Wetlands at Treating Stormwater Runoff in Vermont?

Watershed Consulting Associates collaborated with the University of Vermont to conduct a two-year monitoring study on subsurface gravel wetland systems in Chittenden County, Vermont. As many Vermont municipalities are required to obtain the State’s Operational Stormwater Permit (3-9050) for new development or redevelopment of impervious surfaces, the implementation of subsurface gravel wetlands has proliferated around Vermont to treat stormwater runoff under the 3-9050 permit requirements.

The presentation will review the 2020-2021 performance data on the flow attenuation and phosphorus capture of two gravel wetlands which were selected for this study and introduce design recommendations to improve the performance of future permitted gravel wetlands. Findings from this study will also be provided to the Vermont DEC’s Stormwater Program to optimize the subsurface gravel wetland design requirements.

Link to register: https://us06web.zoom.us/webinar/register/WN_MFz0Z-q9So-P8EO7eCdF7A