The Feasible Research Of City Rainwater Utilization

With the development of cities ,many cities face to the lack problem of water resource.Rainwater is the most kind of fundamental straight economical of water resource and important part of water circulation system of nature ,at the same time ,it is the key effect to adjust , supplement water resource and improve, protect entironment , so rainwater is a important approach to continue development of water resource ,Based on the investigation of the present research of the utilization of urban rainwater ,it research the ways and the technique of the utilization of urban rainwater ,the potential of rainwater resource, the analysis of the water quality , the measures of the utilization of urban rainwater.The paper research the present water resource of our country and compare to the ways of the exploitation of water resource, rainwater is a important approach to continue development of water resource ,it is of great benefit to society , environment and ecology ,especially to economy .To research the influence of urbanization on the utilization of urban rainwater and the relationship of urbanization and the utilization of urban rainwater , the outline of the present research of the utilization of urban rainwater , and the ways and technique of the utilization of urban rainwater , it provide the background to the feasibility of the utilization of urban rainwater.To take the university as example, the paper research the necessity and feasibility of the utilization of xi'an rainwater , analyze the quantity of rainwater and the demand of sundry water. The demand of sundry water is 18975 m~3, the quantity of available annual runoff of the roof and roadway is 21517 m~3,so it is sufficient for the demand. The experiment is began with the runoff quality on the diverse roofage and different grade roadway, the results are as follows:(1) The concentration of contamination is different with the diverse roofage, and SS value is also different with the style roof;(2) In the beginning , the concentration of COD value and SS value is higher ,but the runoff quality will be reduced to steady gradually along with the rainfall duration increase;(3) The city roadway runoff is worse than the roadway of university ,because the city roadway runoff involve vehicle n people and the sanitation and material of roadway;(4) Based on the analysis of rainwater quality , the paper provide the process of rainwater treatment for roof, roadway, and lawn.The paper put forward the feasible measures of xi'an city , and design the compositive process of the utilization of urban rainwater by combining the measures and the pervasion system.