? Although "Sponge City" is a new concept, the promotion speed of China is not slow. This new framework of water ecological management, known as the gradual elimination of "urban diseases", not only adds greening to the city, but also collects rainwater for the city and protects the natural water system in a natural way.
"Sponge" is not an empty concept, but a real landscape pattern. To build a sponge city is to establish the corresponding water ecological infrastructure, which is also the most efficient and intensive way. Therefore, the concept of sponge city construction is inseparable from its application in landscape design. ?
If the traditional urban development cuts off the natural circulation route of rainwater, then the low-impact development is to use a series of landscape and engineering technologies to make urban drainage simulate the natural absorption, storage and evaporation of rainwater and make the urban drainage system follow the rainwater circulation law.
? Low-impact development can effectively control the total runoff, peak runoff and runoff pollution mainly through rainwater infiltration, storage, storage, transmission, pollution interception and purification.
As the main engineering and technical measure of sponge city construction, "six-character proverbs" has its own doorway. Infiltration, reduce hard pavement, make full use of natural underlying surface infiltration, reduce runoff, conserve ecological environment and accumulate water resources. Stagnant flow, through rainwater detention, exchange space for time, improve rainwater stagnation, slow down rainwater collection speed, postpone peak time, and reduce drainage intensity and disaster risk. Regulating storage, reducing peak flow, adjusting temporal and spatial distribution, and creating conditions for rainwater utilization. Clean, reduce non-point source pollution, degrade chemical oxygen demand, suspended solids, total nitrogen, total phosphorus and other major pollutants, and improve the urban water environment. Use, make full use of rainwater resources and reclaimed water, improve the efficiency of water use and alleviate the shortage of water resources. Drainage, construction of gray-green water storage and drainage system, to avoid waterlogging and other disasters, to ensure the safety of urban operation.
? According to the requirements of "infiltration, stagnation, storage, purification, utilization and drainage", at least 75% of rainfall will be absorbed and utilized locally, and the urban area is expected to gradually realize the goals of no water accumulation in light rain, no waterlogging in heavy rain, no black and smelly water body and no heat island relief. Effectively alleviate the shortage of urban water resources, effectively improve the quality of urban water environment, completely solve the problem of water accumulation in waterlogged sections, and scientifically restore and rebuild the water ecosystem.