Environment · 29 Aug 2026

Glacial Lake Outburst Flood GLOF

About this question

Why in news

A flash flood in Nepal's Bhote Koshi valley was first attributed by the USGS to a 4.4-magnitude earthquake, then reattributed to a 5.2-magnitude-equivalent hanging glacier collapse - a hazard type India's existing GLOF monitoring architecture is not calibrated to detect.

Why for UPSC

UPSC regularly tests whether a disaster-management programme's design actually matches the hazard it now faces - here, a lake-breach-focused programme confronting a hanging-glacier-collapse event it wasn't built for.

Prelims summary

India's National GLOF Risk Management Programme followed the 2021 Chamoli disaster and mirrors the 2023 South Lhonak Lake breach in Sikkim. The Hindu Kush Himalaya is warming faster than the global average, weakening slope stability in deglaciated terrain.

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