TyphoonMaysak ChinaFloods FloodResilience UrbanDrainage ExtremeWeather

China floods show how typhoons test reservoirs, roads and cities

*Reservoirs and urban drainage systems came under pressure as floodwaters rose rapidly across parts of southern China. Source: The Guardian*

Typhoon Maysak has killed at least two people in southern China and forced tens of thousands to evacuate after extreme rainfall triggered flooding, reservoir stress and widespread disruption. The storm affected Guangxi after lashing Hainan and Vietnam, bringing heavy rain inland as it weakened over southern China.

In Nanning, the capital of Guangxi, around 55,000 people were affected by flooding and approximately 48,000 were evacuated. Authorities raised the flood control emergency response to its highest level after waters overflowed or broke through barriers at three reservoirs. Officials warned that further heavy rainfall could worsen conditions and make rescue operations more difficult.

The flooding was not limited to Nanning. In Guigang, floodwater turned roads into lakes, submerged vehicles and sent muddy torrents down slopes into a construction site. Further south in Fangchenggang, videos showed cars being pushed by floodwater and residents struggling against fast-moving flows.

Flooding in Guangxi after Typhoon Maysak brought extreme rainfall, forcing evacuations and damaging roads, vehicles and low-lying areas. Source: The Guardian

The impact of Maysak highlights how tropical storms can overwhelm multiple parts of the built environment at once. Reservoirs, roads, drainage systems, slopes, construction sites, power networks and emergency access routes all become vulnerable when intense rainfall arrives over a short period.

Urban flooding is not only a water depth problem. Flow velocity matters. Fast-moving water can move cars, damage road surfaces, scour slopes, flood basements and destabilise temporary works. Construction sites are especially exposed because excavations, exposed soil, temporary drainage and unfinished retaining structures may not yet have the resilience of completed infrastructure.

Reservoir stress is another critical issue. When reservoirs overflow or barriers are breached, downstream flood risk can increase quickly. This requires close monitoring of water levels, spillway performance, emergency discharge capacity and flood routing through nearby settlements.

Typhoon impacts in China highlight the need for stronger flood resilience, slope protection and construction-site water management. Source: AL Jazeera (video snapshot)

China is also facing pressure from Typhoon Bavi, which later weakened to a tropical storm after making landfall in eastern China. Before weakening, Bavi forced mass evacuations, disrupted flights and brought strong winds and heavy rain to eastern and northeastern regions. More than 2.2 million people were evacuated in Zhejiang province, while hundreds of flights were expected to be cancelled at Shanghai’s main airports.

The sequence of storms shows the growing challenge of managing extreme weather across large urban and regional systems. Meteorologists have linked increasing weather-related risks to climate change, with cities, industrial zones, farms and transport networks all exposed to disruption.

Flood resilience must include more than emergency evacuation. It requires stronger drainage design, reservoir safety planning, slope protection, construction-site flood controls, real-time rainfall monitoring and better protection of critical transport corridors.

Typhoons are natural hazards, but the scale of damage depends heavily on how well infrastructure is designed, maintained and managed before the storm arrives.