This is a site description from the 2010 geoNatHaz field school.
A small glacier on Cathedral Mountain produces pools of water on its surface, resulting in jökulhlaups (glacial outburst floods) of 10,000 to 24,000 cubic meters of water mobilizing debris flows of approximately 100,000 cubic meters. The historic debris flows began in 1925, increasing in frequency until 1985 with fans crossing the Trans-Canada Highway and the Canadian Pacific Railway mainline.
No significant events have occurred since the C.P.R began pumping meltwater from the glacier in 1985, although protective structures have also been built both in the form of tunnels to protect the trains, and berms to protect the highway[ref]Jackson, L., Hungr, O., Gardner, J., & Mackay, C. (1989). Cathedral Mountain debris flows, Canada Bulletin of the International Association of Engineering Geology, 40 (1), 35-54 DOI: 10.1007/BF02590340 [/ref].
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