Record floods spark concerns about China’s Three Gorges Dam: report

The Three Gorges Dam, completed in 2012, was built to control severe floods in China. However, experts are questioning its effectiveness as water levels reach a 20-year high. The dam, the world's largest, faces challenges in managing these levels, impacting millions and causing significant displacement and casualties.

What is the significance of the water levels mentioned in the text?

How many people have been impacted by the severe flooding since June?