Identification And Quantitative Assessment Of Utilization Benefit Of Flood Resources From Rivers

Aiming at solving the benefit identification, quantitative assessment and comprehensive evaluation etc. issues of flood resources utilization in China, this essay analyzes and researches above problems based on taking Baicheng City, Jilin Province as an example. The results as following: benefit evaluation is the decision basis of flood resource utilization. Accordingly, a new benefit identification method with function-demand coupling is proposed. Taking the whole water system as the research object, the paper establishes a functional index system in terms of the function and effect, which mainly include water supply, water purification, hydropower generation; and it also establishes a demand index system with respect to the receptivity and the demand of water supply areas. Then, by coupling supply and demand, utilization benefit of flood resource may be identified. The benefit is. classified into economic, eco-environmental and social benefit. Based on the benefit identification by function-demand coupling and the classification of utilization benefit, the paper evaluates the economic and eco-environmental benefits which are quantifiable. The national economy evaluation model for flood water resource utilization is established based on the characteristics of benefit evaluation of flood resource utilization. The focus of this study is on evaluation of the comprehensive benefit of flood utilization in the manner of succession. A multi-level semi-constructive index set is used as evaluation foundation within the Baicheng City, where flood resources have been utilized since 2003. The results from the economic, eco-environmental and social impact are evaluated in a comprehensive way through the multi-level multi-objective fuzzy optimization model based upon entropy weight.Taking Baicheng city as an example, the net present value of connotation benefit (direct benefit) reaches RMB1.092 billion, that of extension benefit (indirect benefit) is up to RMB16.483 billion and that of cost is RMB0.395 billion as per the total flood utilization volume 2.959 billion cubic meters during the period 2003～2008. According to national economy evaluation standard, the net present value of the economy benefit (ENPV) is RMB17.219 billion≥0, the benefit-cost ratio (EBCR) is 49.0≥1, from which we can see that the flood resource utilization is reasonable and feasibility. The net present value of charging price, connotation benefit and economy benefits is 0.03, 0.37 and 5.57 Yuan per cubic meters respectively and the ratio among the three is 1:12:186. The national economy evaluation demonstrates that the flood resource is not only an effective way solving the regional water deficiency but also a kind of promotion to local ecological environment, social harmony and economy development. As expected, the model produces desired outcomes of continuous evaluation on the basis of the base year of 2002, the comprehensive benefit is the highest in 2003 and the least in 2004 because of difference in utilized quantity, the benefit in 2003 is optimal for the benefit increment is 82.8%, the benefit in 2004 is the worst due to the increment of 18.2%.From results of benefit identification and evaluation, it is well-known that there is remarkable economic, eco-environmental and social benefit of flood resource utilization. Consequently, flood resource utilization plays a dominant role in the sustainable development process of the region.