Beijing evacuations following Typhoon Dolphin
WeatherComments
The 2023 event showed that the pumping stations reached peak capacity at 150mm per hour. Forecasts for Dolphin indicate bursts of 200mm, making the infrastructure gap a mathematical certainty.
Wait... a third of the annual rain in one day... does that include the moisture already in the ground from previous weeks? If the soil is already saturated, the runoff would be way worse...
The official reports mention that several of the new permeable pavement projects in the northern districts are still under construction. This means the actual absorption capacity is lower than the 2023 benchmarks suggest.
The government is using real-time satellite telemetry to trigger these evacuations earlier than they did last year. Getting people out of the landslide zones before the rain peaks is a significant improvement in safety.