The need to build a sponge city

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Shandong Xindadi Group


The need to build a sponge city

In modern cities, the water damage caused by rain and flood and rainstorm has become a serious natural disaster that impacts urban construction. The traditional stormwater management model is limited to "pipe-to-pool" transmission facilities, which direct stormwater through pipes, sinks, sideballs and drains. Lack of elasticity and excessive load capacity, and increased the spread of pollutants. In the current situation of frequent urban waterlogging, massive loss of rainwater resources, depletion of groundwater resources and increasingly serious urban heat island effect, the use of permeable paving materials in urban public space is a coping strategy for the increase of urban space density and impervious surface.
After the completion of the sponge city, it can effectively reduce the drainage of rainwater, purify the water quality of rainwater, promote the infiltration of rainwater, and make full use of rainwater resources, so as to effectively alleviate the current urban waterlogging disasters, rainwater runoff pollution, water shortage and other problems. Not only that, for urban residents, sponge cities can significantly increase urban green space, reduce urban heat island effect, regulate urban microclimate, and improve urban living environment through the preservation and restoration of urban vegetation, wetlands, ponds, and streams.
Sponge city construction cannot be completed by one department and one unit. It requires the joint efforts of the whole society. The government is the main body responsible for the construction of sponge city. It should coordinate the planning, land, drainage, roads, transportation, gardens and other functional departments, give full play to the leading role of urban master planning, and determine the control objectives of sponge city according to local conditions. At the same time, the public should be supporters and participants of sponge city construction. For example, various rain gardens, green balconies, miniature wetlands and roof gardens should be built in front of and behind houses.
The proportion of the city's reduced emissions to the total annual rainfall is called the total rainwater runoff control rate. With the deepening of sponge city construction, the total control rate of rainwater runoff may become a mandatory indicator. The fundamental reason for the formation of urban waterlogging is that the runoff generated by rainstorm exceeds the discharge capacity of drainage facilities. Therefore, various engineering measures should be taken to reduce the runoff generated by rainstorm, such as reducing the hardening rate of urban ground, increasing urban permeable ground, allowing more rainwater to infiltrate into the ground and reducing the ground runoff; creating urban green space and wetland, constructing sunken cisterns, and enhancing the ability of rainwater storage and flood; and protection of urban rivers and lakes.

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