Danger from above: On the Nepal flood

Nepal experienced a devastating flash flood on Wednesday, resulting in at least 389 deaths, including several foreign tourists, and 300 Indians still unaccounted for as of Thursday. Satellite imagery revealed that the catastrophe likely stemmed from a glacier collapse or ice-rock avalanche in Tibet. This event may have been followed by a temporary river blockage and its subsequent failure.

Although an earthquake was initially suspected, evidence did not support this theory. Although the initial flood wave has subsided, there are concerns about potential secondary flooding from debris blockages upstream. The Bhote Koshi and Trishuli corridors suffered extensive damage, with 35 motorable and 45 suspension bridges, as well as around 40 kilometers of roads, destroyed.

The Indian Himalayas, home to approximately 7,500 glacial lakes and 15,000 glaciers, are particularly vulnerable to such disasters. While satellite monitoring can aid in assessing glacier health, accurately forecasting a glacier collapse remains extremely challenging. Governments must implement stricter construction codes, discourage settlements in vulnerable zones, and invest in improved tracking of glacier health to prevent future tragedies.