Research: Thousands at risk of glacial lake floods in Nepal
- Roughly 108,000 people live downstream of glacial lakes with ice that could fail in Nepal, according to recent research.
- As glaciers disappear and permafrost thaws due to climate change, thousands of new glacial lakes are forming upstream in Nepal.
- Booming hydropower investments and a growing tourism industry have brought rapid development and paved roads into high mountain catchments across Nepal.
Roughly 108,000 people live downstream of glacial lakes with ice that could fail in Nepal, according to recent research. While standard flood models often rely on broad 1-kilometer buffers around alpine waterways, a recent disaster along the Bhote Koshi river demonstrated that actual high-mountain floods can travel 120 miles and surge up to 330 feet high.
Glacial Lake Hazards In Nepal
As glaciers disappear and permafrost thaws due to climate change, thousands of new glacial lakes are forming upstream in Nepal. Many of these bodies of water are held back by unstable ice dams that can fail with little warning, sending massive pulses of floodwater racing down mountain catchments. Dipesh Chapagain, a senior scientist at the United Nations University Institute for Environment and Human Security, noted that the August flooding in the Bhote Koshi river set a new threshold. Chapagain stated that the risk could even be higher than current research suggests.
Unregulated Construction Along Riverbanks
Booming hydropower investments and a growing tourism industry have brought rapid development and paved roads into high mountain catchments across Nepal. Research shows that the amount of built area within 50 vertical meters of riverbanks increased by approximately 46% between 2016 and 2023. Watson, a researcher involved in the study, pointed out that amenities and growing communities quickly follow initial development into areas sitting dangerously close to active river channels.
Temporary Settlements And Resettlement Plans
Nepal recently called off its month-long search for missing people following the destructive Bhote Koshi floods. Chapagain explained that relief efforts now focus on building temporary settlements for thousands of displaced victims. Officials have not yet established a concrete plan for permanent resettlement, though recovery projects and future infrastructure development must prioritize safe locations and flood early-warning systems.