Comparison and selection of external backbone water source schemes for Yongbei Irrigation Zone in Nanning City
The proposed Yongbei Irrigation Zone Project is located in the northern part of Nanning City,between the main stream of Yujiang River and the main stream of Hongshui River.According to the distribution of the surround-ing river systems and the built hydraulic engineerings,three external backbone water source schemes were pro-posed,including water diversion from Yantan Hydropower Station,Dahua Hydropower Station and decentralized wa-ter diversion from the water sources outside the irrigation zone.Three schemes were compared in respects of water resource condition,engineering geological condition,engineering layout,engineering construction condition,eco-nomic indexes and operation management etc.,before the optimal external backbone water source scheme was pre-liminarily selected.
water sourceDahua Hydropower StationYantan Hydropower StationLaokou Reservoirconstruction conditioneconomic indexYongbei Irrigation Zone