Nepal Faces Flood Threat as 300,000 Residents at Risk

WHO:

NBC News - Scott Watson, a senior research fellow at the University of Leeds, studies glacial lakes.

NBC News - Dipesh Chapagain, a senior scientist at the United Nations University Institute for Environment and Human Security, studies climate change and flooding.

Phys.org - Researchers conducted the analysis on flood risk in Nepal.

WHAT:

NBC News - Approximately 294,000 people are living in areas of extreme flood risk in Nepal.

NBC News - The August disaster caused by a rock and ice avalanche killed at least 1,455 people, with at least 5,285 people still missing.

NBC News - Nearly 14,000 people were rescued during the August disaster.

NBC News - About 108,000 people are downstream of glacial lakes that could fail and release floodwaters.

NBC News - Floods in the August event raised water levels by roughly 330 feet in some communities.

NBC News - The area built within 50 vertical meters of riverbanks increased by approximately 46% from 2016 to 2023.

WHERE:

NBC News - The Bhote Koshi river and its tributaries in Nepal are areas of concern for flooding.

NBC News - The analysis focused on areas within 50 kilometers (31 miles) downstream of glacial lakes or river basin headwaters in Nepal.

WHEN:

NBC News - The researchers began their analysis in fall 2025 and published their findings in a journal on a Thursday.

Phys.org - The flood event occurred on Aug. 26.

WHY:

NBC News - Climate change is destabilizing the rock and ice holding Himalayan slopes together, leading to increased flood risks.

NBC News - Development driven by tourism and trade routes is occurring close to river channels in hazardous zones.

HOW:

NBC News - Researchers built a map of all rivers originating in transboundary areas of Nepal and isolated areas at risk of flooding.

NBC News - The analysis involved mapping what would be exposed to floodwaters in a flood with 50 meters (164 vertical feet) of rising water downstream.

(UPDATED October 8, 2026 19:08 UTC)

Researchers have found that approximately 294,000 people in Nepal are living in areas of extreme flood risk, particularly along the Bhote Koshi river and its tributaries. Following a devastating flood event on August 26 that resulted in at least 1,455 fatalities and left over 5,000 people missing, the analysis highlighted that nearly 14,000 individuals were rescued, while about 108,000 people are downstream of glacial lakes that could potentially fail. The study, which began in fall 2025, reveals that climate change is destabilizing the Himalayan slopes, increasing flood risks as development continues to encroach on hazardous zones near river channels.