In mountainous terrain, large-scale instability may take the form of creep over a period of decades or centuries, or sudden catastrophic collapse. The identification of landslides is vital during the planning stage of a project. This will permit appropriate mitigation work to be implemented, or possibly relocation of the facility to a more stable location. Three Valley Gap, near Revelstoke, BC Services Landslide identification using historical searches, aerial photograph interpretation and field mapping; Risk assessment to facilities located on or in the vicinity of landslides based on likely movement rates, and impact of movement; Laboratory testing of shear strength; Design of remedial measures such as drainage, and installation of protective measures; Installation of movement monitoring systems.

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