Retaining Runoff with Green Infrastructure

Planning for large development on a mountainside in Vermont requires the utmost attention so runoff is managed to protect water resources and reduce downstream flooding.

The Margaret Pratt Community Assisted Living and Memory Care Facility provides private and shared apartments in a pastoral setting in rural Vermont. Given the project development on a terrace overlooking the Upper Connecticut River Valley, managing runoff in a sustainable manor was a paramount project priority. This development required both Act 250 and a State Operation Stormwater permit – introducing some complexity to the needs of the final design. Watershed designed green infrastructure-based system to completely retain and infiltrate even the most extreme storms to prevent downstream erosion and sustain the local groundwater table. The result was a project that far exceeded regulatory requirements with a cost effective and sustainable approach. Key elements of the design included:

  • Porous asphalt parking areas
  • Subsurface infiltration chambers
  • Bioretention areas with expanded subsurface storage for increased infiltration