The Utilization Of Rainwater Resources In Dalian

At present most of our citys have the problem of water shortage in varying degrees. Dalian is one of them.Now, The annual per capita water resources in the city is only 590 cubic meters, it, s only 1/12 of the world's average level. The amount of surface water resources which has been already exploited is reaching 1.6 billion cubic meters, more than 40% of The international warning line. Water shortages become a major limiting factor in Dalian people's lives. By contrast, when the summer flood season comes, urban rainwater usually caused disasters.the reason of such contradictions is that the urban stormwater has not been fully and scientific used. Rainwater as a sustainable use of urban water resources, their effective use will largely address the collection of the city's water shortage, so that resourcezation of rainwater has far-reaching historical and practical significance.This paper reference cities, hydrology, drainage and other engineering theory.Have a depth study of the theory of rain water utilization. Reference lots of the world's water resources of the advanced cases. Have a depth discuss of effect factor t of rainwater harvesting.Demonstrated the necessity and feasibility of water resources, combined with the actual rainfall Dalian resources, a comprehensive and systematic analysis of Dalian rainwater harvesting capacity. Finally put forward practical, scientific and reasonable collection, processing, use model. Aim to find suitable methods of rainwater harvesting and models, and models promotion. In order to solve water shortage problems in other cities, and promot the economic development.The major findings are as follows:(1) Survey the situation of water resources in Dalian, the city likely to flood occurs, the ground subsidence level of the specific status of seawater intrusion investigation, analysis rainwater harvesting in Dalian is necessary.(2) Analysis of precipitation in Dalian, rainwater harvesting conditions, and the integration of economic and environmental benefits,analysis that Dalian is very suitable for rainwater harvesting.(3) Proposes two methods for the calculation of water volume suitable for Dalian:the runoff coefficient, sub-basin water volume calculation method, in the future other city can choose to use.(4) According to the water which contained the main pollutants, proposed efficient measures:mesh filtration system, soil filtration system, constructed wetland treatment system and the coagulation process, and describes the specific operational procedures.(5) Research the direct use of rainwater and indirect use. Contact to Dalian's situation, given the flow chart of the regional water use planning.