Central China's Henan province swamped after heaviest rain in 1,000 years

Residents wade through floodwaters on a flooded road amid heavy rainfall in Zhengzhou, Henan province, China. China Daily via REUTERS

* 12 die in flooded Zhengzhou subway line, more than 500 rescued * Henan hit by heavy rains since weekend; more rain forecast * Provincial capital Zhengzhou, dozen other cities flooded * 'Flood prevention efforts very difficult' - President Xi * Foxconn says 'no direct impact' on Zhengzhou iPhone assembly plant Large swathes of China's central Henan province were under water on Wednesday, with at least a dozen people dead in its capital Zhengzhou after the city was drenched by what weather watchers said was the heaviest rain in 1,000 years. With more rain forecast across Henan for the next three days, the government of Zhengzhou, a city of over 12 million on the banks of the Yellow River, said 12 people were reported to have died in a flooded subway line, while more than 500 were pulled to safety. Video on social media on Tuesday showed commuters chest-deep in murky floodwaters on a train in the dark and an underground station turned into a large, churning pool. "The water reached my chest," a survivor wrote on social media. "I was really scared, but the most terrifying thing was not the water, but the diminishing air supply in the carriage." Due to the rain, the authorities halted bus services, as the vehicles are powered by electricity, said a Zhengzhou resident surnamed Guo, who spent the night at his office. "That's why many people took the subway, and the tragedy happened," Guo told Reuters. From the evening of Saturday until late Tuesday, 617.1 millimetres of rain fell in Zhengzhou, about 650 km southwest of Beijing. That's almost on par with Zhengzhou's annual average of 640.8 mm. The amount of rainfall in Zhengzhou witnessed over the three days was one seen only "once in a thousand years", local media cited meteorologists as saying. The lives of millions of people in Henan, a province with a population of around 100 million, have been upended in an unusually active rainy season that has led to the rapid rise of a number of rivers in the vast Yellow River basin. Many train services across Henan, a major logistics hub in central China, have been suspended. Many highways have also been closed and flights delayed or cancelled. Roads in a dozen cities have been severely flooded. "Flood prevention efforts have become very difficult," President Xi Jinping said on Wednesday, addressing the situation in a statement broadcast by state television. Dozens of reservoirs and dams also breached warning levels. Local authorities said the rainfall had caused a 20-metre breach in the Yihetan dam in Luoyang city west of Zhengzhou, and that the dam "could collapse at any time". In Zhengzhou, the local flood control headquarters said the city's Guojiazui reservoir had been breached but there was no dam failure yet. About 100,000 people in the city have been evacuated to safe zones. Taiwanese technology giant Foxconn operates a plant on the outskirts of Zhengzhou, next to the city's airport, that assembles iPhones for Apple. It said there was no direct impact on its facility, but had activated an emergency response plan. SAIC Motor, China's largest automaker, said logistics at its Zhengzhou plant would see some short-term impact, while Japan's Nissan said production at its Zhengzhou factory had been temporarily suspended. Zhengzhou's transportation system remained paralysed, with schools and hospitals cut off by waterlogging. Some children have been trapped in their kindergartens since Tuesday. Residents caught in the flood had taken shelter in libraries, cinemas and even museums. "We've up to 200 people of all ages seeking temporary shelter," said a staffer surnamed Wang at the Zhengzhou Science and Technology Museum. "We've provided them with instant noodles and hot water. They spent the night in a huge meeting room." About 3 km away, the First Affiliated Hospital of Zhengzhou University - the city's largest with over 7,000 beds - has lost all power, and even backup supplies were down. The hospital was racing to find transport to relocate about 600 critically ill patients.