Since June, more than 10 million people in 26 provinces have been affected by torrential rain, with many cities above and below the Three Gorges Dam submerged by floodwaters, calling into question the effectiveness and stability of the massive facility.
several videos:
https://www.taiwannews.com.tw/en/news/3956817
According to the below article there are more than 90 000 dams/reservoirs, big and small, and the control of the minor ones are not sufficient.
http://www.laiyuan.com/article/1474150.html
More videos https://twitter.com/Lastkombo/status/1279740340522622978
If the rain continues China must either flood cities below the Three Gorges Dam or risk dam collapse. This is the weather forecast:
From Sunday to Monday afternoon, heavy rain and rainstorms are expected in parts of Shanghai, Jiangsu, Zhejiang, Anhui, Jiangxi, Hubei and Hunan, among other regions, the National Meteorological Center said. Some of these regions will see up to 70 mm of hourly precipitation, accompanied by thunderstorms and strong winds, the center said.
China has a four-tier color-coded weather warning system, with red representing the most severe, followed by orange, yellow and blue. The center advised local authorities to remain alert for possible flooding, landslides and mudslides, and recommended halting outdoor activities in hazardous areas.
https://www.shine.cn/news/nation/2007051489/
Conclusion: Expect big causalities and two digit impact on the Chinese GNP (normally flood damage is in the region of 1-3 %/year).