Archive · 26 Aug 2026
Nepal Floods Renew Concerns Over China’s Tibet Dam Projects
Heavy rain caused rivers from Tibet to flood parts of Nepal and India.
In Nepal, fast-moving water damaged bridges, power plants, and villages.
The Kosi and Brahmaputra rivers also threatened many people downstream.
China has built several dams in Tibet and is planning an even larger one called the Medog Dam.
Supporters describe the dam-building program as a way to produce energy and improve energy security.
Critics worry that the proposed dam would be built in an area where earthquakes are common.
Earthquakes could cause landslides, mudflows, or problems for dams.
Changes in river water and sediment could also affect farms and nature in India and Bangladesh.
Experts are calling for safer and more transparent ways to manage water.
Flash floods in Nepal’s Bhote Koshi River killed and displaced people, damaged bridges, hydropower plants, and villages.
The Kosi River in India rose dangerously, while Brahmaputra flooding in Assam killed at least 50 and displaced about 700,000 people.
China has built several dams in Tibet and plans the proposed 60,000-megawatt Medog Dam.
Researchers and experts have raised concerns about earthquakes, landslides, sediment disruption, and downstream flood risks.
Some experts advocate smaller adaptive projects, stronger early-warning systems, and transparent water-data sharing.
- Who
- People and communities in Nepal, India, and Bangladesh are affected; China is developing dams in Tibet.
- What
- Flooding has renewed concerns about the downstream risks of China’s existing and proposed Tibetan hydropower projects.
- When
- The flooding was reported on Wednesday, August 26; the article also references an early-2025 earthquake and a 2026 report.
- Where
- The reported impacts include Nepal’s Bhote Koshi basin, India’s Kosi and Brahmaputra basins, Tibet, and downstream Bangladesh.
- Why
- Concerns center on seismic hazards, possible dam failures or sudden releases, altered sediment flows, and the scale of the planned Medog Dam.
Energy and Development Case
Safety and Environmental Concerns
Purpose of dam construction
Energy and Development Case
China’s broader hydropower program is intended to harness rivers and support energy security.
Safety and Environmental Concerns
Critics argue that the Medog project also involves geopolitics and frontier consolidation, while its risks may outweigh its benefits.
Engineering feasibility
Energy and Development Case
The proposed project has been studied by Chinese scientists, international think tanks, and research centers.
Safety and Environmental Concerns
Researchers have raised concerns about tunneling through permafrost, unstable sediment, reservoir-induced seismicity, and construction in an earthquake-prone zone.
Downstream effects
Energy and Development Case
The article presents hydropower generation and energy security as major potential benefits.
Safety and Environmental Concerns
Sudden releases or dam failures could affect India and Bangladesh, while altered sediment flows could threaten agriculture and ecosystems.
- Affected river
- The Bhote Koshi River originates in Tibet and flows into Nepal.
- Assam flood impact
- Brahmaputra flooding reportedly killed at least 50 people and displaced about 700,000.
- Existing Tibetan dams
- The article names the Zangmu, Jiexu, and Jiacha dams.
- Proposed Medog capacity
- The proposed Medog Dam is reported to have a capacity of 60,000 megawatts.
- Estimated cost
- The project is estimated in the article to cost about 1 trillion yen, or approximately $148 billion.
- Seismic setting
- The proposed site lies near the collision boundary of the Indian and Eurasian tectonic plates.
- Downstream rivers
- The Yarlung Tsangpo becomes the Brahmaputra in India and the Jamuna in Bangladesh.