The Nepal floods question: When the Himalayas collapse, who gets warned?

New Delhi, India – On the morning of August 26, the Himalayan landscape above Nepal’s Rasuwa district changed in minutes.A mass of ice and rock broke loose high in the mountains and sent a violent surge of water, mud and debris down the Lhende Khola River. The torrent travelled through valleys, swept away settlements and infrastructure and eventually reached the Nepal-China border.What followed was not simply a flood.It was a chain reaction.By mid-September, more than 1,400 people had been reported dead and at least 6,000 remained missing in Nepal and across the border in Tibet. Twelve hydropower plants were destroyed, while roads, bridges and homes were buried or washed away.The scale of the destruction has left scientists and disaster managers confronting a difficult question: How do you warn communities about a disaster whose trigger may occur high above them, in terrain that is difficult to monitor and where there may be only minutes to react?Basanta Raj Adhikari, director of the Centre for Disaster Studies at Tribhuvan University in Kathmandu, described the event to Al Jazeera as unprecedented in size, affected area and mechanism. His estimate suggested that the energy involve...