Construction Of The City Ecological Water Environment Based On Rainwater Resource

Most cities in the world facing the water problems such as water shortage、city flood andgroundwater depletion to some degree.The process of urbanization has changed the features ofnatural water cycle，and brought about a seires of urban ecological environment cirsis. Thecirsis performs as lack of safe drinking water and serious pollution of ecological waterenvironment for living. Urban water supply diiffcultly because the urban groundwaterdepletion and irver heavily polluted. Rainwater which had not been taken seriously oirginally,now it let us to regain confidence of building a better ecological urban water environment.This paper presents how to use rainwater resource to construct urban ecological waterenvironment.Basis on other research papers from domestic and abroad as well as cases ofrainwater application, this paper analyzed effection urbanization birng as well as therelationships between it and water resources, water environment and water circulation.Westudy deeply on the necessity and feasibility of using urban rainwater;Urban rainwater wasclassify by exploitative patterns to find suitable application methods; The paper combs thegeneral rainwater theory of urban rainwater in order to form the ideas and steps ofconstruction city ecological water environment based on rainwater resource? then lake Xi’ancity as example to empirical research.Across the research proccss, research results are as follows:(1) Calculation economicvalue of rainwater using, and laid the foundation of the rain reuse;(2)Using gray relationalmethod to evaluate carrying capacity of urban water environment, get to Xi’an urban waterenvironment in the past decade trend map. At the same time sort out the rainwater reuse basicdata;(3) Put forward the stratiifed and steps on the construction of urban water environmentideas;(4) Analyzed urban rainwater resource as a whole, and targeted to the speciifccircumstances of Xi’an, then selects suitable method to form Xi’an’s ecological waterenvironment.