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.

The deadly flash flood in Nepal on Wednesday was likely caused by a huge chunk of a glacier that broke off and temporarily dammed a river, according to preliminary investigations by scientists.