Forecast, Monitoring and Local Warning Constitute a Complementary Early Warning System in Flash Flood Risk Management: A Case Study in Lianxi River of Zhejiang Province

In the southeast coast of China, flash flood risk management is usually based on natural villages. In recent years, extreme rainfall increased, with the impact of man-made activities, flash floods occur frequently. This paper introduces an Early Warning System, which is composed of forecast warning, monitoring warning and local warning complementing each other. In order to explore the key role of early warning system in flash flood risk management, we study a flash flood disaster prevention case in Lianxi River Basin of Zhejiang Province during Severe Typhoon In-Fa in 2021. In addition, we analyze and discuss the main problems encountered in the case and put forward some suggestions to provide references for the prevention and control of flash flood disaster.