Study On The Storage And Drainage Of Flood In The JINAN Urban

In the last few years, accompanied by the urbanizing progress speeding, the city scale uninterrupted growth. On the one hand the problem about city storm water drainage difficulty is more and more outstanding. Some big or medium city of our country such as Peking, Shanghai, Nanking, Guangzhou, Zhengzhou, Jinan, Fushan, Zhuhai etc., in flood season, when it is storm, the street would become river, result in heavy traffic jam, the people's life and property is subjected to a threat of flood. On the other hand, the ecological environment of urban is gradually worsen. The level of underground water descend, the land subside, the spring is dried up, the city water pollution turn worse, the contradictions between water resources supplying and demanding is growing in breadth and in depth. Among of 600 cities of our whole country, there is more than half cities of which the water is shortage, 108 cities of those were short of water seriously. How to cut down the surface runoff, to exterminate or to reduce the disaster of urban water logging, protect the city's water ecosystem environment, have become an important topic concerned widely.The urban storm water runoff has itself characteristics and regulation. To solve urban rain flood excrete difficult, we must research further the regulation and characteristics of the urban storm water runoff, only base on deeply studying the city storm water runoff regulation, a reasonable project about urban storm water runoff storage and drainage can be put forward. This text is first to analyze the causes of the difficulty of the region which the Lishan Street cross over, there are three main reasons discovered that cause the city water logging disaster. The first is that the ability of city outdoors drainage system is lower than rainfall intensity, The quantity of storm water beyond the ability of the system completely depends on the surface runoff to drain away, that is direct reason result in disaster of the urban water logging;The second is the city construction to change the urban nature valley that is rainfall collected, the place to store flood water was occupied by building, factory, etc., the watershed is break, the storm water excessively collected toward low-lying land in the urban, that is artificial reason cause the urban water logging disaster;The third is that urbanizing construction step to speed, the city scale was extension, the exhausted gases cause hothouse effect rising, the increment of cementing and bituminous pavement, the coagulate pit of water steam to increase in the air, cause the urban air temperature going up, the probability of rain rising and the rainfall in urban increment and the coefficient of rain surface runoff lifting, is the basic reason cause urban rain water logging disaster.To solve the problem completely, we must base on the researching the cause that result in Jinan urbanstorm water disaster, be guided by the Stable, Sustained and Coordinated Development Theory, proceed in all case from sustained utilizing of water resource, begin on taking effective measures to reduce urban storm water runoff, use the experience of native and other countries for reference, directed against the special characteristic of Jinan urban storm water. We must change traditional idea to create city drainage system new, alter water drainage for capture, alter water getting out of for making use of, change rapid drainage to sluggish drainage. The flood control works in urban and suburban, on ground and underground, would be unified planning and management. Then this text laid special stress on analysis the effect of the measure called source control works that were taken to reduce storm water disaster such as making small residential areas use of pool to store storm water to be delay drained, storm water was scattered to be stored, using Daming lake to retain water for control urban flood, the works to let water seeps through underground for reducing runoff, utilizing rainwater, etc. and reach six principle that must be insisted when we make a plan about city flood control and drainage. Last this text recommend scheme of Jinan City Flood Control And City Drainage Planning.