Engineers discuss at the construction site of the Dateng Gorge hydro dam in Guiping, south China's Guangxi Zhuang Autonomous Region, Aug. 10, 2019. Located in the city of Guiping, the Dateng Gorge hydro dam is designed for multiple purposes including flood control, navigation and power generation. In particular, it will reduce river salinity during the dry season, thus ensuring the quality of water supply to Pearl River Delta cities including Macao. (Xinhua/Cao Yiming)