Parks and walks close to the Yellow River in Lanzhou City, southwest China's Gansu Province, have been closed due to rising water levels caused by torrential rain. /VCG Photo

The water flow has reached 3,730 cubic meters per second, the largest this year, according to the local government. /VCG Photo

Trees have been felled while some areas off the river are waterlogged. /VCG Photo

A level-4 flood prevention alert, the highest in the country's flood warning system, has been issued. /VCG Photo