A river chief and staff workers patrol in a river in Donglin Town of Huzhou City, east China's Zhejiang Province, July 10, 2018. The local government has introduced a "river chief for summer" mechanism, in which the river chiefs patrol the river periodically, inspect embankment and river course, and make real-time recording with smartphone APP, to step up flood prevention work. (Xinhua/Xu Yu)

A river chief and staff workers patrol at a reservoir dam in Donglin Town of Huzhou City, east China's Zhejiang Province, July 10, 2018. The local government has introduced a "river chief for summer" mechanism, in which the river chiefs patrol the river periodically, inspect embankment and river course, and make real-time recording with smartphone APP, to step up flood prevention work.(Xinhua/Xu Yu)

Aerial photo taken on July 10, 2018 shows a river chief and staff workers patrolling in a river in Donglin Town of Huzhou City, east China's Zhejiang Province. The local government has introduced a "river chief for summer" mechanism, in which the river chiefs patrol the river periodically, inspect embankment and river course, and make real-time recording with smartphone APP, to step up flood prevention work. (Xinhua/Xu Yu)

A river chief and staff workers patrol at a reservior in Donglin Town of Huzhou City, east China's Zhejiang Province, July 10, 2018. The local government has introduced a "river chief for summer" mechanism, in which the river chiefs patrol the river periodically, inspect embankment and river course, and make real-time recording with smartphone APP, to step up flood prevention work. (Xinhua/Xu Yu)