South Richvale Valleyland Restoration Works

Toronto and Region Conservation Authority (TRCA), in association with the City of Richmond Hill, completed remedial erosion control works along Patterson Creek, in order to provide long-term protection to at-risk municipal land and infrastructure.

Project Location

map of project work area
Project location and work areas. Source: TRCA, 2020.

Scope of Work

  • Start Date: Spring 2019
  • Completion Date: Fall 2020

Remedial works were implemented at the South Richvale Valleyland Restoration Works Project in order to provide long-term protection to at-risk municipal land and infrastructure. The project included the following:

  • Geotechnical and geomorphic study (completed in 2017)
  • Development of detailed design (completed summer – winter 2018)
  • Obtain all necessary and approvals to proceed to construction (winter 2018 – spring 2019)
  • Replacement of a failed cribwall with a vegetated revetment at Site CC (2020)
  • Replacement of a failed cribwall with a vegetated revetment and woody debris fish habitat features at Site C8 (2020)
  • Replacement of a failed concrete revetment with a vegetated revetment and woody debris fish habitat feature at Site C10 (2020)
  • Site restoration, including trail paving, as well as installation of native tree and shrub (final touch ups to be completed spring 2021 as weather permits)
Before at Site CC with failed cribwall, erosion scour and bank slumping along the west bank of Patterson Creek. Source: TRCA, 2018.
After at Site CC with completed vegetated revetment and restoration site plantings. Source: TRCA, 2020.
Before at Site C8 with failing cribwall and erosion scour at the toe of the valley slope. Source: TRCA, 2018.
After at Site C8 completed with newly installed vegetated boulder revetment and coarse woody debris fish habitat features. Source: TRCA, 2020.
Before at Site C10 showing the existing concrete slab revetment protruding into the creek at Site C10. Source: TRCA, 2018.
After at Site C10 with newly installed vegetated revetment and root wads. Source: TRCA, 2020.