Analysis on how sponge city can alleviate urban waterlogging from the perspective of water cycle

From the point of view of water cycle, this paper analyzes the methods of relieving urban waterlogging in sponge city: improving urban drainage capacity, increasing the diameter of drainage pipes and building deep tunnel water storage projects.

In extreme weather, we should pay attention to emergency management ability and take more decisive emergency measures instead of blindly raising flood control standards. At the same time, we should strengthen the crisis management of the city and build an elastic city so that it can resist the crisis when it comes. Sponge city is a must. It can absorb rainwater, promote water circulation, improve urban drainage as a whole and share the pressure of drainage system.

Sponge city is different from pipeline laying.

In Wuhan, Lianyungang, Qingdao and other places, the effect of sponge city construction has gradually emerged. However, in the face of heavy rainfall in summer, there are still many pilot cities with waterlogging.

This phenomenon should be viewed comprehensively. The heavy rainfall in summer not only tests the water storage capacity of sponge city, but also puts forward higher requirements for the drainage capacity outside the city. The water level in the periphery of some cities is very high, and it is difficult to discharge the water level in the urban area when encountering heavy rainfall, which is also one of the reasons for waterlogging in many cities.

The construction of sponge city tests the comprehensive planning, construction and management ability of the city. At present, how to build a sponge city and how to deal with the construction difficulties is still a dilemma to be solved urgently. Some projects unilaterally understand the sponge city as the application of engineering measures, which is a misunderstanding of the sponge city. Sponge city is different from pipeline laying. Different understanding of sponge city itself leads to different effects of the current pilot project.

In the construction of sponge city, we should adjust measures to local conditions. The construction scheme of sponge city can not be applied to one model, and the corresponding construction scheme of sponge city should be formulated according to the different climate and geological conditions of different cities. For example, in some cities, there are many hard floors, and rainwater is difficult to penetrate, or the groundwater level in some cities is high. These are all factors that need to be considered comprehensively.

In addition, in the construction of sponge city, we should not only do a good job in urban planning and construction, but also consider the arrangement and dispatching of water system, and solve the problem of urban waterlogging through comprehensive means such as regional comprehensive water transfer and river water conservancy management.