What changed
A peer-reviewed study estimates that at least 300,000 people may now live in potential disaster paths across parts of Nepal, south-eastern Tibet and India’s Uttarakhand. Built-up land in the studied high-risk zones grew about 45% between 2016 and 2023, while development near glacial-lake flood threats rose almost 78%.
Why it matters
The danger is not sitting beyond the edge of town. In Pokhara, the Seti Gandaki River runs through the city, and some older buildings stand only about 5m from its banks despite newer setback rules. The hard question is no longer whether development should move back, but where people and buildings can realistically go.
The study examined territory up to 50km downstream from Himalayan rivers and about 1,360 glacial lakes. It found expansion in tourism, housing, infrastructure and hydropower, placing more homes and businesses in landscapes where floods and landslides can turn a river corridor into a trap.
Recent events make that exposure concrete. An 11 October flood along the Budhi Gandaki River damaged 200 houses, swept away five bridges and left five people missing. In the Annapurna region, a homestay operator said only five of his 20 rooms were occupied during what is normally peak trekking season after floods and landslides hit nearby settlements.
The study was completed before August’s devastating floods in Nepal, so its estimate may already understate the people at risk. It also covered only a specific territory, meaning the wider exposed population could be substantially higher. That leaves municipalities and tourism businesses facing a choice that becomes more expensive with every new building: enforce safer distances now, or attempt emergency relocation after the next river rises.
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