| Aiming at the rain flood being underused and discharged directly in Xi'an,which caused the waste of water resources,this paper analyzed the utilization of the urban rain flood resources in Xi'an. The main contents of this paper include: Investigated the characteristics of nature-human geography,hydrology,meteorology and the water resources situation in the study area. Analyzed the precipitation characteristics of Xi'an City. Calculated the theoretical number of urban rain flood resources and the number of flood resource can be collected. Put samples and selected the rainfall runoff water upon the road surface,then conducted indoor experiment to analyze the quality of the samples. Then look up some relevant information and proposed a viable scheme of flood resources collection and utilization in Xi'an City. This study reached the following conclusions:1.The theoretical number of urban rain flood resource is 295.69×106m3/a;the number of flood resource can be collected is 103.9×106m3/a,and the roof and road rainwater resources account for 84%;2.The main pollutants in runoff are COD and SS.From the point of each partition, the runoff quality of industrial area is the worst;the contents SS in each type are all between in95-115mg/L;the contents of COD are of great difference;3.The quality of the runoff is poor within 15 min of the rainfall,but it improves markedly after 15 min.Therefore,15 min can be used as the start time node in runoff collecting;4.The runoff resource in Xi'an can meet the urban miscellaneous water and the river-landscape water completely.And the rest of the resource can add a portion of industrial water, then we can have 8720×104 m3 clean water be saved;5.Rainwater harvesting system is mainly composed of rainwater collection device and rainwater purification device.Utilization plan includes the roof rainwater collection storage system, road rainwater collection storage system and greenbelt rainwater infiltration system. |
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