Aerial photo taken on Aug. 14, 2020 shows a wholesale market flooded by the Yangtze River at Caiyuanba, southwest China's Chongqing Municipality. Yangtze River, China's longest, has recorded the fourth flood of the year in its upper reaches after a spell of heavy rainfall, authorities said Friday. (Xinhua/Huang Wei)

Aerial photo taken on Aug. 14, 2020 shows the Yangtze River near Caiyuanba, southwest China's Chongqing Municipality. Yangtze River, China's longest, has recorded the fourth flood of the year in its upper reaches after a spell of heavy rainfall, authorities said Friday. (Xinhua/Huang Wei)

Photo taken on Aug. 14, 2020 shows a logistics market flooded by the Yangtze River in southwest China's Chongqing Municipality. Yangtze River, China's longest, has recorded the fourth flood of the year in its upper reaches after a spell of heavy rainfall, authorities said Friday. (Xinhua/Huang Wei)

Photo taken on Aug. 14, 2020 shows the Yangtze River near Chaotianmen in southwest China's Chongqing Municipality. Yangtze River, China's longest, has recorded the fourth flood of the year in its upper reaches after a spell of heavy rainfall, authorities said Friday. (Xinhua/Huang Wei)

Emergency staff members check a logistics market flooded by the Yangtze River in southwest China's Chongqing Municipality, Aug. 14, 2020. Yangtze River, China's longest, has recorded the fourth flood of the year in its upper reaches after a spell of heavy rainfall, authorities said Friday. (Xinhua/Huang Wei)

Photo taken on Aug. 14, 2020 shows the Yangtze River near Chaotianmen in southwest China's Chongqing Municipality. Yangtze River, China's longest, has recorded the fourth flood of the year in its upper reaches after a spell of heavy rainfall, authorities said Friday. (Xinhua/Huang Wei)

Photo taken on Aug. 14, 2020 shows flood water of the Yangtze River near Nanbin Road, southwest China's Chongqing Municipality. Yangtze River, China's longest, has recorded the fourth flood of the year in its upper reaches after a spell of heavy rainfall, authorities said Friday. (Xinhua/Huang Wei)

Photo taken on Aug. 14, 2020 shows the Yangtze River near Chaotianmen in southwest China's Chongqing Municipality. Yangtze River, China's longest, has recorded the fourth flood of the year in its upper reaches after a spell of heavy rainfall, authorities said Friday. (Xinhua/Huang Wei)

Photo taken on Aug. 14, 2020 shows a wholesale market flooded by the Yangtze River at Caiyuanba, southwest China's Chongqing Municipality. Yangtze River, China's longest, has recorded the fourth flood of the year in its upper reaches after a spell of heavy rainfall, authorities said Friday. (Xinhua/Huang Wei)

Photo taken on Aug. 14, 2020 shows a wholesale market flooded by the Yangtze River at Caiyuanba, southwest China's Chongqing Municipality. Yangtze River, China's longest, has recorded the fourth flood of the year in its upper reaches after a spell of heavy rainfall, authorities said Friday. (Xinhua/Huang Wei)