Himalayan disaster expert urges joint cross-border water data sharing

Destructive floods recently struck Nepal after a rock and ice mass collapsed from a mountain slope, according to disaster risk analyst Safi Ahsan Rizvi. The former adviser to the National Disaster Management Authority and retired IPS officer stated that governments must view cross-border data sharing as a collective public benefit rather than a political favor. Global scientists note that a rock-ice avalanche caused the event, though the exact water volume remains under study.

Causes And Geography

The avalanche dropped nearly a vertical kilometer before charging down steep inclines. Gravity, water, and loose debris combined to push the flood downstream at extreme speeds. Experts are still examining whether climate-driven glacial melting destabilized the mountain slope or if geological failure happened first. The flood carried much more water than the 2023 Sikkim disaster, yet satellite pictures did not show a large existing glacial lake in that specific spot. A temporary landslide dam may have formed and then burst, but researchers continue investigating the exact source of the excess water.

Mitigation And Warning Systems

Locals noticed the river flow dropping hours before the disaster, hinting that a blockage was forming upstream, though visual observation alone cannot predict flood size. Mitigation options include pumping water out, using siphons to reduce pressure, or digging alternative drainage channels. However, these lakes sit at about 5,000 meters altitude where work is possible only during a few months using specialized tools. India has previously mapped 195 high-risk glacial lakes through broad consultations with scientists and state agencies to help authorities prioritize safety measures.

Context

Mountain ecosystems face mounting environmental pressures as rising temperatures accelerate the melting of glaciers and expand high-altitude water bodies. Developing effective safety infrastructure in remote alpine zones requires long-term investment, specialized engineering, and close coordination across national boundaries.