Sponge city: breaking through the traditional concept of rainwater management

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New Earth Group


Sponge city: breaking through the traditional concept of rainwater management

The construction of sponge city should take the construction of urban buildings and residential areas, urban roads, green spaces and squares, and water systems as the carrier, and all departments and majors such as urban planning, design, construction and engineering management should coordinate as a whole. break through the traditional concept of "drainage-oriented" urban rainwater management, and build a low-impact development rainwater system through a variety of ecological technologies such as infiltration, stagnation, storage, purification, utilization and drainage.
For buildings and residential areas, roofs can be made green, which can save energy and reduce emissions and alleviate heat island effect while retaining rainwater. Sidewalks and squares can be paved with permeable water. Conditional residential green space should "sink" to allow rainwater to enter the sunken green space for storage, infiltration and purification, instead of directly discharging through sewers. The landscape water body of the residential area can be used as a comprehensive facility for regulating, purifying and utilizing rainwater.
Urban road is one of the main places where runoff rainwater and its pollutants are produced, and the control of urban road runoff rainwater is particularly important. The sidewalk can be paved with permeable water, and the road green belt can sink. If the space of the green belt is insufficient, the road surface rainwater can be introduced into the surrounding public green space for consumption. Urban green space and square should be built with rainwater storage function of multi-functional "rain flood park", urban water system should have sufficient rainwater storage and discharge capacity, waterfront green belt should have the ability to purify the city's rainwater, water system shoreline should be designed as ecological revetment, improve the self-purification capacity of the water system.
Maintaining and restoring the water absorption, seepage and water purification capacity of urban green space and water body is an important means to build a sponge city. Therefore, while ensuring the original functions of urban roads and green spaces, it is also necessary to rationally plan the land layout and vertical design, so that low-impact development rainwater facilities can be effectively connected with the urban rainwater pipe canal system and the excessive rainwater runoff discharge system, and give full play to the city's "green" Infrastructure and "gray" infrastructure can work together.

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