Event description


On August 12, 1997, an ice avalanche from the Diadem glacier triggered a displacement wave, which overtopped the moraine dam of Queen Bess Lake. About 8 Mio m3 water escaped from the lake. The flood still was noticed by forestry personnel 100 km from the source.





Data source


Clague, J. J., Evans, S. G. (2000): A review of catastrophic drainage of moraine-dammed lakes in British Columbia. Quaternary Science Reviews, 19, 1763 � 1783.




The floodwaters extensively eroded Quaternary deposits in the west fork of Nostetuko valley, damaged tracts of forest, and left wood debris and coarse sediment on bars and channel margins.