The construction of Hydropower Dams on the main stream and on the main tributaries of the Mekong River will create a devastating domino effect. Dams will significantly reduce fish reproductive success, which will impact on fisheries and biodiversity. This is because dams will effectively block fish migration routes and access to spawning grounds for fish and other aquatic species. This, in turn, will impact enormously on the economy of Vietnam and Cambodia through the loss of fisheries revenue.
The Don Sahong Dam in Southern Laos, is located in the worse possible place in the Mekong River: not only will it be on a geological fault line, and thus exposed to tremors that can make it collapse with disastrous effects for downstream communities. But, it is also blocking the Hou Sahong Channel, the most important year-round fish migration channel in this area of the Mekong River.
Scientists for the Mekong offer this article to inform the public, the delegates at COP21, and decision-makers worldwide about the impacts of hydropower development on the Lower Mekong River, and the serious repercussions for 60 million people in SE Asia. This article provides an overview of the many significant environmental and social impacts of hydropower dams on the Mekong River basin.
To download the report click here.
Image: WWF Greater Mekong