Recognition Of The Value And Effective Utilization Of Water Resources In The Northern Cities

Water shortages have become a common social phenomenon. Water shortages have become the bottleneck of industrial development. Water as a resource has not only commercial value but own value. Rainwater is a water resource, so it has a corresponding value. For cities, 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 environment. Therefore, realizing effective collection and utilization to urban development is of great significance.Taking typical northern city—Xi'an for Example, it has studied value of water resources and analyzes potentiality of water resource by the mobel.Based on experiments of rainwater quality, this paper analyzed of water quality of Xi'an industrial, commercial, cultural district. According to the different underlying surface, it analyzed and compared between on the road and roof runoff water quality.Based on summarize use of rainwater collection systems and stormwater treatment method, this paper have designed use programs of typical residential water .Results are as follows:(1) Guaranteed rate of 50% in precipitation conditions, the theoretical potential of rainwater during the year in Xi'an high 1.372×10~8m~3, the actual potential of rainwater can be collected 0.423×10~8m~3, water potential value 0.881×10~8 yuan. Economic value of water resources is considerable.(2) Concentration of pollutants in stormwater runoff, as the rain continued to gradually reduce and gradually achieve stability. 10min runoff after rain reduced the COD concentration is generally 150mg / L the following, SS concentration dropped to 200mg / L or less. Water quality can meet the three criteria.(3) Rainwater utilization system mainly consists of rainwater harvesting systems and two parts water treatment systems, rainwater harvesting system consists of roof rainwater harvesting system rainwater collection systems and roads.(4)Yanta District Xi'an University of Technology as an example for rain water resource use planning design. The results showed that: compared conventional drainage, the stormwater treatment stage filtration and purification of artificial vegetation and soil treatment, operation cost 1.945 yuan / m~3, lower than the current price 2.55 yuan / m~3 in Xi'an.