Photo taken on July 10, 2019 shows a security warning notice to alarm the flood at the dike of the Xiangjiang River in Changsha, central China's Hunan Province. The water level of Xiangjiang River is above warning line due to continuous heavy rainfall. (Xinhua/Li Ga)

A citizen takes photos of the flooded Xiangjiang River in Changsha, central China's Hunan Province, July 10, 2019. The water level of Xiangjiang River is above warning line due to continuous heavy rainfall. (Xinhua/Li Ga)

Aerial photo taken on July 10, 2019 shows the flooded Xiangjiang River in Changsha, central China's Hunan Province. The water level of Xiangjiang River is above warning line due to continuous heavy rainfall. (Xinhua/Xue Yuge)

Aerial photo taken on July 10, 2019 shows the flooded Xiangjiang River in Changsha, central China's Hunan Province. The water level of Xiangjiang River is above warning line due to continuous heavy rainfall. (Xinhua/Xue Yuge)

Aerial photo taken on July 10, 2019 shows a submerged navigation sign in the flooded Xiangjiang River in Changsha, central China's Hunan Province. The water level of Xiangjiang River is above warning line due to continuous heavy rainfall. (Xinhua/Li Ga)

Aerial photo taken on July 10, 2019 shows the junction section between Xiangjiang River and Liuyang River in Changsha, central China's Hunan Province. The water level of Xiangjiang River is above warning line due to continuous heavy rainfall. (Xinhua/Li Ga)

Aerial photo taken on July 10, 2019 shows a submerged navigation sign in the flooded Xiangjiang River in Changsha, central China's Hunan Province. The water level of Xiangjiang River is above warning line due to continuous heavy rainfall. (Xinhua/Li Ga)

Aerial photo taken on July 10, 2019 shows the junction section between Xiangjiang River and Liuyang River in Changsha, central China's Hunan Province. The water level of Xiangjiang River is above warning line due to continuous heavy rainfall. (Xinhua/Li Ga)

Photo taken on July 10, 2019 shows the flooded Xiangjiang River in Changsha, central China's Hunan Province. The water level of Xiangjiang River is above warning line due to continuous heavy rainfall. (Xinhua/Xue Yuge)