The Three Gorges Dam in Yichang, Hubei province, discharges excess floodwater on Monday. The dam has played a key role in flood relief efforts in the middle and lower reaches of the Yangtze River. WANG GANG/FOR CHINA DAILY

Aerial photo taken on July 27, 2020 shows floodwater being discharged from the Three Gorges Dam in Central China's Hubei province. The third flood of the year in the Yangtze River occurred in its upper reaches as the Three Gorges reservoir saw an inflow of 50,000 cubic meters per second at 2 pm Sunday. [Photo/Xinhua]

Aerial photo taken on July 27, 2020 shows floodwater being discharged from the Three Gorges Dam in Central China's Hubei province. [Photo/Xinhua]

Photo taken on July 27, 2020 shows floodwater being discharged from the Three Gorges Dam in Central China's Hubei province. [Photo/Xinhua]

Photo taken on July 27, 2020 shows floodwater being discharged from the Three Gorges Dam in Central China's Hubei province. [Photo/Xinhua]

Aerial photo taken on July 27, 2020 shows floodwater being discharged from the Three Gorges Dam in Central China's Hubei province. [Photo/Xinhua]

Aerial photo taken on July 27, 2020 shows floodwater being discharged from the Three Gorges Dam in Central China's Hubei province. [Photo/Xinhua]

Aerial photo taken on July 27, 2020 shows floodwater being discharged from the Three Gorges Dam in Central China's Hubei province. [Photo/Xinhua]

Number of key reservoirs to store floodwater during the flood season and their total storage capacity CHINA DAILY