In recent years, the rapid development of the city caused changes in hydrological characteristics, urban waterlogging disasters caused by the heavy rainfall increased. Waterlogging disasters seriously affect people’s lives and health, and have caused huge economic losses to society.
Urban waterlogging is relatively common in China. Previously occurred in some coastal low-lying areas, now in inner cities this also occurs often. Over the past few years, urban land for construction is small, there are more available land to choose from, generally the higher grounds are choosen to do construction, and now, urban land is very much in-need, with less choices. Meanwhile, with the construction of modern cities, many new problems went up in drainage water logging. In many places under the overpasses , the rain will assemble. As to the case of tunnel crossing , railway bridge and highway bridge, the similar situation exists.
Currently, a large number of scholars have conducted a number of studies in regards to the prevention and treatment of urban waterlogging. Through summarizing the achievements of those previous studies, I come to the conclusion that although China’s reseach has been quite fruitful in fields concerning the fight against urban waterlogging , involving more in scope, but in some aspects there are still some deficiencies which need to be further supplemented and improved. Although most of these domestic researchs have mentioned to improve the permeable facilities, to construct urban drainage network and other measures, but they all lack concrete solutions to these problems, and these solutions are almost invariable. In accordance with urban waterlogging situation, controlment measures should be taken according to local conditions.
This thesis is meant to study specific issues. According to the climate, precipitation, topography, river systems, vegetation cover, urban construction situation in Hefei and the citizen’s living and other factors , discuss their influnce on waterlogging. On the basis of the previous studies, taking waterlogging in the city of Hefei as the case, studying and analysising the formation and prevention of city waterlogging, and in the end put forward the advises and suggestions of my own. waterlogging, control and other aspects of analysis and research, put forward their views and recommendations of the author.