关于水利经济计算中的几个问题

在水利工程经济计算中,净现值、内部收益率、效益费用比等都是指标,只表示效益的相对高低,而不是真正的效益值;对投资回收年限用列表法和公式法对比计算,发现:当净效益流程为一等值时,用公式法计算误差较小,当净效益流程为一变化值时,采用列表法较合理;对现值的折算,用传统折算法步骤较烦,用改进折算法则较简.

Several Problems about the Economic Calculation of Water Conservancy

In the economic calculation of hydraulic project, the data such as net present worth, interal rate of return, benefit-cost ratio are all indexes, which only reflect relative figures of benefits, but not the actual benefits. Using the methods of a table and a formulation to calculate the invest-veturned life and comparing them, we cam find that when the flow of net benefits is equal, the errors caused by the method of a formulation is less and while the flow of net benefits is alterative, the method of a table is more reasonable. On the discount of present worth, the improved method is more simple than the traditional method.