Analysis Of Urban Rainwater Utilization Project Benefit Assessment And Incentive Measures

The urban rain water utilization is the efficient measures to relieve flood disaster, add groundwater and water resource, and improve ecosystem virtuous circle. This paper choses the typical area as test site to harvest rainwater in Dalian, and designed three comparative schemes on the basis of the experimental results. According to the measured rainfall data in2011, the equilibrium analysis of water supply and demand was completed. The cost and benefit of test scheme and three planning schemes were calculated in dependently. The best scheme with the maximum comprehensive benefit was preferred out by the Comprehensive Evaluation of Cost-Benefits Method. The assessment indexes of ecological and social benefits that could be quantified were selected as the mainstay for the compensation calculation of incentive measures. The main conclusion can be summarized as follows:(1) The benefit assessment method of urban rainwater utilization project based on the project proceeds was present. Take the rainwater utilization project in the campus of Dalian University of Technology as an example, the economic benefits of planning schemes for this project were estimated according to this method and the result showed that the method was reasonably practicable.(2) It puts forward the "ecology-society benefit evaluation method", which is used to quantitatively calculate the compensation amount of rainwater incentive measures. According to the benefit assessment index system of rainwater utilization project, this method turns all the ecology-society benefit into qualitative analysis and quantitative calculation, and the whole ecology-society benefit is attained as a result, this takes part, equal and excess payment as the criterion to calculate the amount of government subsidy of rainwater utilization project. Comparing with the other ways, such as through investment proportion in the project, ecology-society benefit evaluation method is able to incite more residents to harvest and utilize rainwater.(3) This paper indicates there is some need for government incentive measures in rainwater utilization in urban cities. The benefit of rainwater utilization is kind of little, mostly it reveals in ecological and social aspects. Taking scheme one being carried out in the research as an example, the net yield rate is7.01%in10years, and the actual yield rate is4%deducting the4%of price increasing rate. In contrast with other hydraulic project, its poor rate is far below and which suggest popularization of rainwater utilization need the incentive measures and support from government.(4) This paper designs a rainwater accumulation device, which has the following characteristics:good treatment effect, without direct contacting between human body and rainwater, sustainable supply of water and quantitative observation. Furthermore, the water treated by this device is able to reach the non-potable water quality standard. To meet the demand of car-washing and improve the efficiency of equipment utilization, the feeding water device can be added automatically when there is a rainwater shortage. In the device, tap water and rainwater are separated, washing and cleaning water are from the former, and the rainwater doesn’t directly contact with the body skin, so all is for the water security. Thus the rainwater accumulation device contains a water sight gauge, which may monitor the amount of water at any time.