Do the dams work?
China has historically relied on dams, levees and reservoirs to control the flow of water.
Around 30 billion cubic metres of floodwater were intercepted last year by dams and reservoirs in Asia's longest river, the Yangtze, mitigating flooding downstream in areas including Shanghai, China's emergency management ministry said.
But the country's vast water management schemes are unable to contain all the flooding while there are questions about the endurance of dams built decades ago.
On Tuesday night, the army warned a damaged dam in Henan province "could collapse at any time" after a record downpour. Troops blasted an opening in the dam to release water and raced to reinforce other embankments with sandbags across the province.
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