The devastating flood in Rasuwa on Wednesday has once again exposed a critical gap in Nepal’s disaster preparedness: the country often learns about hazards in the high Himalayas only after they have begun wreaking havoc downstream. A preliminary assessment by the National Disaster Risk Reduction and Management Authority suggests that the flood was triggered by an ice-rock landslide or avalanche that blocked the Lendhe River near the Nepal-China border. The resulting surge of water and debris appears to have entered the Trishuli River after passing through Timure. The precise cause and sequence of events still need to be established through field investigations and satellite imagery. But the uncertainty itself highlights a larger problem. Whether the trigger was an ice avalanche, landslide, temporary river blockage or another mountain hazard, Nepal needs to know about such developments before floodwaters reach populated areas. Much of Nepal’s major river systems originate in the high Himalayas, including areas that are extremely difficult to monitor from the ground. Events occurring upstream can therefore unfold beyond the reach of Nepal’s surveillance systems while communities downstream remain unaware of the danger.
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Climate change is making this vulnerability more serious. Rising temperatures are destabilizing glaciers, snow and mountain slopes, while extreme weather events are becoming increasingly difficult to predict. Glacier-related hazards, landslides, glacial lake outbursts and sudden river blockages can rapidly turn into disasters for communities, infrastructure and livelihoods downstream. Nepal cannot afford to treat the Rasuwa disaster as another isolated tragedy requiring only a post-disaster investigation. It should instead serve as a catalyst for establishing a permanent, institutionalized disaster information-sharing mechanism with China. China has significantly greater technological and monitoring capacity in the Tibetan region, including satellite-based observation. Nepal should seek an arrangement under which information on unusual developments in upstream rivers, glaciers, ice avalanches, landslides, temporary river blockages and glacial lakes is shared with Nepal in real time, or as close to real time as technically possible. Such cooperation should go beyond occasional exchanges between government agencies. It should establish clear protocols on which agency communicates with whom, what constitutes a warning, how quickly information is transmitted, and how alerts reach local authorities and communities. The system should combine satellite imagery with hydrological, meteorological and ground-based data. Where feasible, Nepal and China could also explore joint monitoring of particularly vulnerable river systems and mountain areas.
Most importantly, information must reach people in time to act. Communities along rivers such as the Trishuli need rapid and understandable alerts through mobile phones, sirens, radio and local emergency networks. A sophisticated monitoring system is of little value if its warnings do not reach people downstream. Such cooperation should also include scientific collaboration. Joint technical assessments, satellite data sharing and information exchange could help both countries establish the causes of disasters more quickly and improve future risk forecasting. Nepal has repeatedly paid a heavy price for hazards developing in remote mountain areas. Waiting for floods to arrive before responding is no longer adequate. In an era of increasing climatic and geological extremes, early information is itself a form of disaster preparedness. The Rasuwa flood should therefore prompt Kathmandu and Beijing to move from occasional information exchange to a formal, reliable and continuously operating early warning partnership. No warning system can prevent every disaster. But even a short period of advance notice can mean the difference between timely evacuation and tragedy. The Himalayas may separate Nepal and China geographically, but the rivers, glaciers and hazards along their shared frontier do not respect borders. Disaster preparedness should not either.
