China damned over floods

As Mekong River floodwaters in Laos and Thailand recede, indignation with China for its lack of transparency on upstream dam developments is on the rise. China has recently pursued a friendly policy of economic integration with Southeast Asian neighbors but in relation to Mekong River development it has taken what many see as a covetous and less than neighborly approach.

Flood waters in recent days inundated parts of Luang Prabang and Vientiane provinces in Laos and at least seven northern provinces in Thailand. The flooding was widely reportedly the worst in a century for some areas, with river levels reaching a high of 13.7 meters on August 14. Previous record high floods occurred in 1966, when river levels reached 12.4 meters.
China has so far completed three dams across the upper Mekong – the Manwan in 1993, the Dachaoshan in 2002 and the Jinghong in June of this year. The three dams have respective storage capacities of 920 million, 890 million and 1.2 billion cubic meters, meaning a total of over 3 billion cubic meters of reservoir. This is enough, environmentalists say, to significantly influence water flows on the upper Mekong. Chinese officials have countered that since only 18% of the Mekong’s flow originates in its areas, the dams will not have an effect on the volume of water flowing downstream.

China’s grand vision for the Mekong is to build up to fifteen power-generating dams on its upper reaches to fuel economic growth in its laggard southwestern territories. The Xiaowan dam, the world’s tallest at 292 meters, is slated for completion on the upper Mekong in 2013. Scheduled to generate over 4,000 megawatts of electricity, that particular hydropower dam has downstream Southeast Asia concerned about the massive reservoir the dam is expected to create and its anticipated impact on river water levels. Chinese officials have said the 190 square kilometer reservoir will reduce the amount of water flowing downward by 17% during flood seasons and increase the flow by 40% in dry seasons.

Asia Times