For a thousand year Chinese civilization grow along this kind of river, river is mother of Chinese people.
Huang ho (Yellow river), Yangtze, Mekong are ancient river, so they are main part of nature "engine", responsible for climate in China.
Water engineering are not a new issue in China, there are history about it from King of Yu time, water project in Szechuan, Grand Canal they build for man benefit, with simple tools, with hundred to thousand power labor but nothing about blocking river mainstream!
Chinese planner are chasing by dateline of their own agenda, they swear not gonna stop by anything even by good reason. This time China worried by clean energy matters, but in next future by how to get supply of good quality water.