◆ Why construction sponge city?
1, the city is developing too fast, hardened area is too large
2, the traditional pipeline drainage is not suited to urban development
3, the city size over water resources carrying capacity
4, rain and sewage mixed runoff and rainwater runoff source pollution
5, due to lack of water and excessive exploitation of groundwater
6, the original river system was destroyed
7, water resources are not effectively managed systematically