Photo taken on June 21, 2019 shows water gushing out from the Xiaolangdi Reservoir on the Yellow River in central China's Henan Province. The reservoir started to discharge water at 2,800 cubic meters per second Friday. (Photos: Xinhua/Lyu Jianping)

Tourists watch water gushing out from the Xiaolangdi Reservoir on the Yellow River in central China's Henan Province, June 21, 2019. The reservoir started to discharge water at 2,800 cubic meters per second Friday.

Photo taken on June 21, 2019 shows water gushing out from the Xiaolangdi Reservoir on the Yellow River in central China's Henan Province. The reservoir started to discharge water at 2,800 cubic meters per second Friday.

Tourists watch water gushing out from the Xiaolangdi Reservoir on the Yellow River in central China's Henan Province, June 21, 2019. The reservoir started to discharge water at 2,800 cubic meters per second Friday.

Photo taken on June 21, 2019 shows water gushing out from the Xiaolangdi Reservoir on the Yellow River in central China's Henan Province. The reservoir started to discharge water at 2,800 cubic meters per second Friday.

Tourists watch water gushing out from the Xiaolangdi Reservoir on the Yellow River in central China's Henan Province, June 21, 2019. The reservoir started to discharge water at 2,800 cubic meters per second Friday.

Tourists watch water gushing out from the Xiaolangdi Reservoir on the Yellow River in central China's Henan Province, June 21, 2019. The reservoir started to discharge water at 2,800 cubic meters per second Friday.

Tourists watch water gushing out from the Xiaolangdi Reservoir on the Yellow River in central China's Henan Province, June 21, 2019. The reservoir started to discharge water at 2,800 cubic meters per second Friday.