Aerial photo taken on Oct. 12, 2021 shows water gushing out from sluiceways of the Xiaolangdi Reservoir on the Yellow River in central China's Henan Province. Due to continuous rainfall, the Yellow River has seen three floods since Sept. 27. The water level of the Xiaolangdi Reservoir on Oct. 9 reached a record high of 273.5 meters since the dam was built. [Photo by Shang Kunlun/Xinhua]

Aerial photo taken on Oct. 12, 2021 shows water gushing out from sluiceways of the Xiaolangdi Reservoir on the Yellow River in central China's Henan Province. Due to continuous rainfall, the Yellow River has seen three floods since Sept. 27. The water level of the Xiaolangdi Reservoir on Oct. 9 reached a record high of 273.5 meters since the dam was built. [Photo by Jiang Liang/Xinhua]

Aerial photo taken on Oct. 12, 2021 shows water gushing out from sluiceways of the Xiaolangdi Reservoir on the Yellow River in central China's Henan Province. Due to continuous rainfall, the Yellow River has seen three floods since Sept. 27. The water level of the Xiaolangdi Reservoir on Oct. 9 reached a record high of 273.5 meters since the dam was built. [Photo by Jiang Liang/Xinhua]

Aerial photo taken on Oct. 12, 2021 shows the Xiaolangdi Reservoir in central China's Henan Province. Due to continuous rainfall, the Yellow River has seen three floods since Sept. 27. The water level of the Xiaolangdi Reservoir on Oct. 9 reached a record high of 273.5 meters since the dam was built. [Photo by Jiang Liang/Xinhua]

Aerial photo taken on Oct. 12, 2021 shows water gushing out from sluiceways of the Xiaolangdi Reservoir on the Yellow River in central China's Henan Province. Due to continuous rainfall, the Yellow River has seen three floods since Sept. 27. The water level of the Xiaolangdi Reservoir on Oct. 9 reached a record high of 273.5 meters since the dam was built. [Photo by Jiang Liang/Xinhua]