Decision-making Of Urban Rainwater Comprehensive Utilization And Technology Research On Regulation And Storage And Infiltration.

With the enhancement of urban level and rapid development of economy,some problems such as conflict of supply and demand of water resources, prevention and cure of water environment and control of flood and drainwaterage in city is increasingly standing out. In China, the research on urban rainwater utilization is in primary stage, which is important to saving water, alleviating flood disaster, supplying ground water, controlling runoff pollution and improving urban environment.Urban rainwater utilization will be one of effective ways to solve the problem of urban water resources.In this paper, based on existing status of research of rainwater problems at home and abroad, the necessity and feasibility of city rainwater utilization and the classification of city rainwater utilization were analysed,the utilization method of rainwater and the rationale rainwater utilization were discussed.City development of impermeable surface area increases, the resulting is the reduction of groundwater and increase of rainwater runoff peak flows, increasing pressure on urban flood control and other hazards.This paper expatiated the significance of infiltration of City stormwater runoff on the spot and made suitable infiltration facilities calculation method and key parameters in Xi'an, providing technical basis for designing of the runoff infiltration.Based on theoretical method of the main line, to guide practice for the purpose in this paper, A certain district in Xi'an qujiang for the specific study area were elected for systematic analysis of rain resources utilization.The conclusion were: The rain resources utilization system of this project offers some reference function to rainwater construction project of the city, especially to subsidence square building group.It's significant to alleviate the emission of rain water,improve rain rescources efficiency and the urban ecological environment.