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PRELIMINARY RESERVOIR IMPACT LINES FOR THE SITE C CLEAN ENERGY PROJECT
Session: Landslides and Slope Stability I / Mouvements de terrain et stabilité des pentes I
Scott McDougall, BGC Engineering (Canada)
Michael Porter, BGC Engineering (Canada)
Andrew Watson, BC Hydro (Canada)
The Site C Clean Energy Project is a planned third dam and hydroelectric generating station on the Peace River in northeast British Columbia, Canada. The Site C dam would be an earthfill dam with a height of approximately 60 m and would create a reservoir that would be approximately 83 km long. A detailed assessment was undertaken to characterize the potential for groundwater changes, flooding, shoreline erosion, slope instability and landslide-generated waves resulting from the impoundment and operation of the reservoir. The results of this assessment were used to generate preliminary reservoir impact lines that delineate areas of potential hazard. Four preliminary impact lines have been prepared in accordance with guidance provided by the International Commission on Large Dams: a Flood Impact Line, an Erosion Impact Line, a Stability Impact Line, and a Landslide-Generated Wave Impact Line. The reservoir impact lines are linked to recommendations for site-specific analysis, land use, and monitoring. They were intended to support the environmental assessment and the management of risks to public safety, land use and infrastructure. This paper provides definitions for the impact lines, describes how they were developed, and illustrates how they can be used to help communicate and manage geohazard risks.
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