Innovation September-October 2013

f ea t u r e s

Major avalanche in the mountains north of Mission, BC, that blocked an access road and almost hit a transmission line.

snowpack data gathered on the project is combined with other nearby observations that have been shared through the Canadian Avalanche Association’s InfoEx or other information exchange systems to estimate the avalanche hazard on a specific day. When the hazard is elevated and the risk exceeds the accepted level, avalanche control is required—seeking to either reduce the encounter probability (likelihood of an avalanche of a given size occurring), or the consequence (impact) should an avalanche occur. Explosives, avalanche path modification, and snowpack compaction are all methods that can reduce the risk. Exposure to avalanche hazard can also be reduced by using road closures, warning motorists not to linger in hazardous areas, or building snowsheds. Using personal safety equipment (avalanche transceivers, probes, shovels, air bags, etc.) or more robust infrastructure or equipment will also reduce the risk. The degree of loss in the event of a snow-slide can also be reduced through the training and preparedness of personnel. An education and training program will improve workers’ familiarity with where avalanches are likely to occur in a given area, and Recycled ski lift towers were installed on an avalanche slope above a powerhouse at Whistler, BC. This is designed to retain snow and prevent it from sliding down into the powerhouse.

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