A flash flood struck Nepal after a likely glacier collapse or ice-rock avalanche in Tibet. At least 359 people had died and 300 Indians remained missing by Thursday. The flood damaged settlements and transport links. It also affected hydropower assets and monitoring infrastructure.
How the Nepal Flood May Have Developed
- Satellite evidence indicated a glacier collapse or ice-rock avalanche, possibly followed by a temporary river blockage and sudden failure.
- An earthquake was first suspected, but available evidence did not support that explanation.
- Debris blockages upstream may cause secondary flooding after the main flood wave passes.
Why Himalayan Glacier Hazards Are Difficult to Predict
- The October 2023 South Lhonak Lake disaster showed that a glacial lake outburst flood can develop over several years.
- The Indian Himalayas contain nearly 7,500 glacial lakes and about 15,000 glaciers.
- Satellite monitoring can identify danger, but it cannot accurately forecast a glacier collapse.
- Glacial lakes lie in inhospitable terrain, while field expeditions are generally feasible only from July to September.
Making Himalayan Development Safer
- Dams and hydropower projects are often among the first assets damaged by natural outbursts increasing amid global warming.
- Governments must enforce construction codes and discourage settlements in known vulnerable zones.
- Large projects should be restricted where glacier-related hazards threaten communities and infrastructure.
- Better glacier-health monitoring must inform long-term disaster planning and development programmes.
Mains Angle
GS Paper III: Disaster management and climate change. Practice question: Explain why glacier-related hazards require both scientific monitoring and risk-sensitive development in the Himalayas.