(1) The construction of sponge city is an important content of "stabilizing growth, adjusting structure, promoting reform and benefiting people's livelihood". Sponge city construction design All aspects of city construction are closely related to new district construction, old city reconstruction and shed reconstruction, involving the construction of real estate, roads, landscaping, water bodies and municipal infrastructure, which can effectively stimulate investment. According to preliminary estimates, if the new district development and old city reconstruction are implemented according to the concept of sponge city, the annual investment can be nearly one trillion yuan.

(2) Sponge city construction is an important measure to implement ecological civilization construction. Through the construction of sponge city, the original ecologically sensitive areas such as confluence, lakes, wetlands, pits and ditches will be transformed. Will be protected. Combine green buildings, low-impact development and construction (LID) and green infrastructure construction, make full use of natural landforms, regulate rainwater runoff, make full use of natural vegetation, soil and microorganisms to purify water, and minimize the damage of urban development and construction to the original ecological environment.

(3) The construction of sponge city is an important way for the green development of urbanization. It can protect urban ecological space, conserve water, purify water quality, adjust urban microclimate and reduce urban heat island effect. At the same time, it can also provide habitats for living things, especially aquatic animals and plants, restore urban biodiversity and create a beautiful ecological landscape environment.

(D) Sponge city construction has an important supporting role for China to overcome the middle-income trap. The 13th Five-Year Plan period will be a crucial period for China's economy to break through the middle-income trap, and its success or failure depends largely on the transformation and upgrading of the economic structure. Throughout the history of developed countries, it is always to control pollution first, and then seek industrial and technological upgrading from green development to achieve a new round of economic development. The development of green urbanization also plays an important role in China's economic construction. As an important measure for China's urbanization to take the road of green development in the future, the construction of sponge city will certainly help China to cross the middle-income trap.

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