7 Study of Sponge City strategies 2

Green roof Sponge City (SC) strategy could be another effective solution. When the rain floods come, the runoff from the roof of the building is one of the important causes of the internal paralysis in the city. Therefore, transforming the roof of a city's building into a green roof can effectively relieve the pressure of urban stormwater runoff. On the one hand, collecting and storing rainwater through the sponge city structure and using rainwater for irrigation can save various energy consumption; on the other hand, the green roof will form a good urban landscape and increase the overall greening rate of the city. In the green roof strategy, green vegetation is planted on the surface to absorb excess rainwater runoff during rain and flood, and the rainwater is collected and stored in the rainwater bucket for storage and reuse. The bottom of the green roof is provided with a light soil layer and a root protection system. Multi-layer structure protection such as through-layer, drainage layer, and the waterproof layer can protect the surface of the building at the same time. The green vegetation layer with various plants can absorb building heat and alleviate the urban heat island effect. 


Large-area hard place SC strategy could mitigate the modern city issue which is the large-area hard surface with a little green land cover. It is acknowledged that this issue could lead to the urban flood. The existing hard ground is basically a grey building. The soil is hardened and hardened repeatedly and almost loses its permeability. The conventional hard engineering stormwater management does not respond to the harmful consequences of rainwater. The discharge method is simply to transfer the pollution problem from one place to another. According to the relevant theory of SC, during a heavy rainstorm in a large area within a city, it is necessary to effectively solve the problem of rapid drainage and reduce surface runoff. Under certain circumstances, the functions of water purification and water storage are increased, and ecological benefits are increased as well.

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