Planning is the source of sponge city construction, and the functions of the city should be scientifically laid out according to the topography and geological structure characteristics of the city. Each functional area of the city should match the urban building structure, population density and the ability to resist urban disasters. The capacity of urban underground drainage facilities should be adapted to the collection of surface water. Urban built-up areas should not occupy urban water space, but should realize "returning the city to water"
Second, it should be combined with eco-city construction.
Sponge city can not only absorb precipitation to replenish groundwater, reserve water for the city and prevent floods, but also alleviate the underground funnel caused by groundwater exploitation and ensure the safety of urban foundation. Sponge city construction should be divided into the organic components of urban infrastructure and ecological construction. Correct the positioning of sponge city in urban construction, and the essential function of the city as an artificial natural organism can be improved, thus promoting the sustainable and healthy development of the city.
Third, it can be combined with the construction of underground utility tunnel.
Traditional urban infrastructure construction ignores the construction of urban flood drainage facilities. However, with the climate change and urban expansion, the expansion of urban built-up areas has led to a significant urban "heat island effect", and the area of accumulated water has increased, and the hardening of built-up areas is likely to cause urban floods. Therefore, the construction of sponge city should be included in urban flood control. Therefore, it is imperative to incorporate sponge city construction into urban infrastructure construction, but sponge city construction should avoid urban underground hollowing out, forming underground rivers and leading to urban collapse. The construction of urban drainage facilities can be synchronized with the ongoing urban underground common ditch construction. Urban infrastructure such as drainage, roads, electric power, communication, gas, heat, environmental protection and disaster prevention is regarded as an important part of urban construction, and the systematic, synchronous, sustainable and monitorable nature of infrastructure construction is emphasized.
The fourth is to integrate into the construction of smart cities.
Smart city is the wisdom of urban development, and relying on wisdom to drive urban development is the future urban form. Through the monitoring of the comprehensive underground pipe gallery, the urban drainage situation can be found in time, and the manual forced drainage facilities can be started to eliminate urban water accumulation.
Fifth, financing should be diversified.
The construction cost of sponge city is very high, ranging from 1 to10.50 billion yuan per square kilometer. Calculated by per square kilometer 1 10,000 people, the per capita 1 to10.5 million yuan. Therefore, we should adopt diversified sharing methods. The PPP model should be more specific. For example, the construction of sponge city in the new urban area can be included in the large supporting fees of urban infrastructure, and the construction of sponge city in the old urban area is linked to the income of old reform enterprises and urban water supply enterprises, forming a sustainable financing model of sponge city.
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