Flash floods submerged streets and vehicles in Guangzhou and surrounding areas of southern China during a heavy rainstorm in late April 2024 [1].

The scale of the flooding highlights the vulnerability of urban drainage systems to extreme weather events, posing immediate risks to public safety and transportation.

The storm dumped more than 270 mm of rain within a 24-hour period [1]. This volume of precipitation overwhelmed local infrastructure, resulting in chest-high floodwaters in several city streets [1].

Emergency responders moved more than 200 residents from their homes to safer locations [1]. The deluge turned urban corridors into waterways, trapping vehicles and hindering movement across the region.

Local authorities focused on evacuations as the rain intensified. The event is described as rare for the month of April in this region of southern China [1].

“More than 270 mm of rain in 24 hours”

The occurrence of such intense rainfall in late April suggests a deviation from typical seasonal weather patterns in southern China. When urban centers like Guangzhou experience chest-high flooding from a single storm, it indicates that existing drainage capacities may be insufficient for the increasing frequency of extreme precipitation events.