The scale of the disaster in the Himalayas is becoming clearer a day after catastrophic flooding tore through parts of Nepal and Tibet. Scientists believe the disaster was likely triggered by the collapse of a glacier, unleashing a torrent of water, mud and debris that swept away entire communities. Geoff Bennett discussed more with Dan Shugar of the waterSHED Lab at the University of Calgary.

A devastating flood in Nepal and Tibet has left a trail of death and destruction. Torrential rains sent a wall of mud and debris crashing through communities with little warning. Geoff Bennett reports.