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长距离引水工程中无压引水隧洞经济纵坡选定的是否合理,对整个引水工程的经济效益影响很大,其经济纵坡与施工方法、地形、地质条件、引水流量、建筑材料价格、电价及折现率等诸多因素有关。经过对项目投资总额和项目寿命期内运行管理费用等的计算,采用最小费用法并考虑资金的时间价值对无压引水隧洞不同纵坡对应的总费用进行比较,确定出经济合理的经济纵坡。
Long-distance water diversion project without pressure diversion tunnel economic longitudinal slope selected reasonable, the entire water diversion project has a great impact on the economic benefits of its economic longitudinal slope and construction methods, topography, geological conditions, diversion flow, building materials prices, electricity prices And the discount rate and many other factors. After calculating the total project investment and operation management cost over the life of the project, the minimum cost method and considering the time value of funds are used to compare the total costs corresponding to different longitudinal slopes of non-pressure diversion tunnels to determine the economical and reasonable economic longitudinal slope .