February 24 – March 2, 2025 Stimson Mekong Monitor
Spotlight
Significant releases from China’s large dams push river to higher-than-normal levels.
Sustained large releases from China’s Xiaowan and Nuozhadu Dams are causing the river to run at levels 1-2 meters higher than normal along the Thai-Lao border. The two graphs illustrate the sudden spike in river level occurring during the last days of February, corresponding to about 900 million cubic meters of water releases from China’s dams. Under normal dry season conditions, the river level does not spike in a manner seen on the graphs. At this time of year, the river level should gradually decrease over the next six weeks. Sudden spikes in river level, particularly those which run for sustained periods at higher levels, can be devastating for the river’s ecological processes and for the communities who depend on the river.
What Happened Last Week?
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- Where’s the Water: Last week, dams throughout the basin released a significant cumulative total of 1.6 billion cubic meters of water. Significant releases came from Xiaowan (PRC, 749 million cubic meters), Nuozhadu (PRC, 164 million cubic meters), and Thuen Hinboun Expansion (LAO, 199 million cubic meters). Dry season water releases generate hydropower but also artificially raise the level of the river. Where is the water?
- River Levels: River levels throughout the basin are now about one meter higher than normal. See how this looks.
- Wetness and Weather: While the headwaters of the Mekong in China are excessively wet (blue), most of the lower Mekong region is experiencing intensifying drought (red). Dry season irrigation activities in the Mekong Delta are creating slightly above average wetness anomalies in Vietnam’s delta. Temperatures in the Mekong basin were about average overall, with slightly above-average temperatures in the northern portion of the basin and slightly below average temperatures in the lower basin. See the maps.
- Where’s the Water: Last week, dams throughout the basin released a significant cumulative total of 1.6 billion cubic meters of water. Significant releases came from Xiaowan (PRC, 749 million cubic meters), Nuozhadu (PRC, 164 million cubic meters), and Thuen Hinboun Expansion (LAO, 199 million cubic meters). Dry season water releases generate hydropower but also artificially raise the level of the river. Where is the water?
CVD 