Residents wade on waterlogging Keji Road in Xi'an, capital city of northwest China's Shaanxi Province, July 24, 2016. Rainstorm hit Xi'an on Sunday evening, causing waterlogging and traffic congestion. (Xinhua/Tao Ming)

Photo taken on July 24, 2016 shows traffic congestion on a waterlogging road in Xi'an, capital city of northwest China's Shaanxi Province. Rainstorm hit Xi'an on Sunday evening, causing waterlogging and traffic congestion. (Xinhua/Wang Bo)

Residents wade on a waterlogging road in Xi'an, capital city of northwest China's Shaanxi Province, July 24, 2016. Rainstorm hit Xi'an on Sunday evening, causing waterlogging and traffic congestion. (Xinhua/Tao Ming)