Erosion

Riverine Erosion Hazard

Erosion hazards mean the loss of land, due to human or natural processes, that pose a threat to life and property. The erosion hazard limit for river and stream systems (riverine systems) is determined using the 100-year erosion rate (the average annual rate of recession extended over a hundred year time span) including allowances for toe erosion and slope stability as well as consideration for access during emergencies or for maintenance. The erosion hazard component of river and stream systems is intended to address both, erosion potential of the actual river and stream banks, as well as erosion or potential slope stability issues related to valley walls through which rivers and streams flow. The determination of the erosion hazard limit will depend on whether the watercourse flows through a defined valley system and is confined by valley walls or whether it flows through an undefined valley system where the landscape is typically relatively flat, and rivers and streams are not confined or bounded by any discernable valley walls.

Further guidance on determining the erosion hazard limit for riverine systems within CVC’s jurisdiction may be found in Section 5.4 (Natural Hazards) of CVC’s Watershed Planning and Regulations Policies (April 2010).

Refer to Fluvial Geomorphology for Riverine Erosion Hazard.

Lake Ontario Shoreline Erosion Hazard

Refer to Shoreline for Lake Ontario Erosion Hazard. Additional information for erosion hazards associated with the Lake Ontario Shoreline may also be found in Section 5.4 (Natural Hazards) of CVC’s Watershed Planning and Regulations Policies (April 2010), with additional details in CVC’s Lake Ontario Shoreline Hazards report (September 2005).

Technical Guidelines

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