2065438+01Why did the rainstorm in Beijing form such a serious water accumulation on June 23rd?

First of all, the urban area is too large and there are too many hardened floors. Rainwater can't penetrate into the ground, and all of it is concentrated on the pipeline, which greatly exceeds the carrying capacity of the pipeline.

The second is high strength. The maximum rainfall of the rainstorm in Beijing 1 1623 reaches 2 18mm, which is roughly equivalent to the standard of once in 300 years. It is extreme weather and the drainage system can't cope with it.

The third is that the flood discharge capacity of the urban water system is not enough, the river channel is full, and the drainage pipeline can't get in anyway.