Increasing extreme weather events in the fragile Himalayan region are causing flash floods.
About flash floods
- Definition: Flash floods, of short duration and very localized, caused in a matter of hours by intense rain, rapid melting of snow, failure of dams or dams or ice jams, which leave very little time to warn and respond.
- Other recent events: Chennai (2015), Kerala (2018), Assam (2024), etc.
Key causes of flash floods in the Himalayas
- Climatic and meteorological factors: Downpours, heavy rains, interaction between westerly disturbances and monsoons, climate change and atmospheric aerosols trigger extreme rainfall and flash floods.
- Glacial lake outburst floods (GLOF): Sudden release of large amounts of standing water due to the melting of blocks of ice in rivers fed by glaciers.
- Geographic factors: High elevations and steep slopes cause heavy precipitation and rapid surface runoff.
- Anthropogenic (human-induced) factors: Unplanned infrastructure (dams, roads, etc.), unscientific hill cutting, poor slope stabilization, and inadequate mud removal (construction debris) destabilize slopes, clog drainage, and intensify flash flooding.
Way forward
- Strengthen early warning systems: Expand India Meteorological Department Flash Flood Guidance Services (FFGS), satellite monitoring and ensuring real-time alerts reach vulnerable communities.
- Disaster-resistant infrastructure: Adopt scientific planning of drainage, slope stabilization and regulate construction in the fragile Himalayan regions.
- Risk-based planning: Recognize flash floods as a distinct disaster, conduct localized vulnerability mapping and develop state-specific SOPs.
- Community-based resilience: Integrate indigenous knowledge into local early warning and disaster preparedness systems.
