Almost a year’s rainfall fell in three days on Zhenzhou, the capital city of China’s central Henan province between July 17–20, inundating reservoirs and flooding the underground system for the subway and trains. Many of Zhengzhou’s water reservoirs, including Changzhuang, Guojiazui, and Jialu River, were filled to overflowing. Zhengzhou’s railways, highways, and civil aviation traffic were severely affected. A video posted on Twitter by Radio Free Asia showed that the city became a lake within four hours. The floods poured into the subway underground tunnels and trains. By 1:40 p.m. local time on July 20, water began to accumulate on the roads but it was still drivable. By 2:20 p.m. the water was over the wheels of vehicles. By 3:20 p.m. cars were completely underwater. At 5:30 p.m. the subway tunnels flooded and the city became a lake. The entire Zhengzhou subway line ceased operation, and many passengers were trapped in …