随着国民经济的发展,各部门对水的需求量日益加大,目前许多城市普遍存在着水源不足、用水紧张的问题,制约了经济的发展。因此,水资源的开发及合理利用工作,已经提到日程上来。任何水利工程能否兴建,要看它的经济效益及社会效益如何,即为工程花费了一定的费用能否换来大于费用的效益,如效益大于费用,此工程则有兴建的可能,反之则不可能。因此,对水利工程的经济分析,是保证水利工程符合自然规律和经济规律的重要手段。由于水利工程的性质,决定着其效益也具有自身的一些特点,如随机性,非恒定性及复杂性。所以除了确实难以定量并不能用统一的货币指标表示,而用文字进行描述的以外,凡可以计量的都应尽可能进行计 With the development of the national economy, the demand for water by various departments has been increasing. At present, the problems of insufficient water supply and water shortage in many cities generally restrict the economic development. Therefore, the development and rational utilization of water resources have already been mentioned on the agenda. Whether any water conservancy project can be constructed depends on its economic and social benefits. That is, if a certain cost for the project can be exchanged for more than the cost benefit, if the benefit is greater than the cost, the project may be constructed, and vice versa impossible. Therefore, the economic analysis of water conservancy projects is to ensure that water conservancy projects in line with the laws of nature and economic laws of the important means. Due to the nature of hydraulic engineering, its efficiency also has its own characteristics, such as randomness, unsteadyness and complexity. So apart from the fact that it is indeed difficult to quantify and can not be expressed in terms of a unified monetary indicator but is described in words, measures that can be measured should be carried out whenever possible