Depending on how full, the dam also slows Earth's rotation speed lengthening the day, changes Earth's wobble and pole locations, makes the Earth fatter at the equator while bringing the poles closer, slightly causes world-wide climate change, as well as alters the distribution of gravity, how much things weigh, and the speed of time. All these changes are tiny but lab instruments can measure them.
They have reduced the flow from the Three Gorges Dam to 19 000 m3/s (it was > 28 000 yesterday), and the level has increased to 150.31 m it was some 148 m. Perhaps to reduce the flow of water to Wuhan? Note that it takes a few days for the water to go from the Three Gorges Dam to Wuhan.
Perhaps due to this:
The Yangtze River Water Conservancy Commission upgraded the level III emergency response of the Yangtze River flood and drought disaster prevention to level II at 14:00 on July 10. The Hydrological Bureau dispatched a working group to the front line to guide the flood prevention work. The current flood and drought disaster prevention work has entered a critical period.
The emergency rescue team and related detachments should be fully prepared, and once the flood storage area is activated or when the levee breach occurs, the relevant hydrological testing work should be carried out immediately, and the water resources center and forecast center should conduct professional technical analysis and implement emergency forecast in a timely manner.
http://www.cjh.com.cn/article_73_238718.html
If this continues they have to relocate a lot of people.