Sponge city refers to the city can

Sponge city refers to the city can be like a sponge, in adapttoing to environmental changes and natural disasters and other aspects have a good "elasticity", when rain absorbs water, water storage, water seepage, water purification, when needed to release and use the stored water. Sponge city construction should follow the principle of ecological priority, combine natural routes with artificial measures, and maximize the accumulation, permeation and purification of rainwater in urban areas under the premise of ensuring the safety of urban drainage and flood prevention, and promote the utilization of rainwater resources and ecological environment protection. In the process of sponge city construction, we should coordinate the system of natural precipitation, surface water and groundwater, coordinate the various aspects of water recycling such as water supply and drainage, and consider its complexity and long-term nature.