What are the causes of urban rainstorm?

1. Under the background of global climate change, extreme weather has increased significantly, and major cities around the world are frequently harassed by rain, flood, drought and heat.

2. The urban area is too large, the urban heat conduction effect is obvious, and the superheated airflow rises, which greatly increases the frequency and intensity of urban rainfall;

There are many high-rise buildings in the city, which disturb the local airflow and aggravate the rainstorm.

Human Nature: Unreasonable Development and Construction

4. The hardened ground is too large, which hinders the infiltration of rainwater. Green turf is impervious to water and is usually higher than the ground. A large amount of rainwater can only directly enter the drainage pipeline, far exceeding the capacity of the drainage system;

5. Natural reservoirs and rivers are buried, and there is no room to store rainwater. Beijing West Railway Station is built on the lotus pond, and the Second Ring Road is built on the moat. The once "sea" and "lake" turned into high-rise buildings, which crowded out the rainwater outlet.

6. There are too many concave overpasses, forming natural water accumulation points;

7. In order to create a landscape, the water level of urban inland rivers has been too high for many years, and rainfall cannot be discharged;