Flood management countermeasures of mountain creeks with limited protection
He Bingshun1,2，Huang Xianlong3，Ling Yongyu1,2，Wang Wenke3
（1. China Institute of Water Resources and Hydropower Research，Beijing 100038；
2.Research Center on Flood and Drought Disaster Reduction ， Ministry of Water Resources， Beijing 100038 ；
3. Office of State Flood Control and Drought Relief Headquarters，Beijing 100053）
Abstract：For small mountainous watersheds with sparse population, the management of water courses can't take high standard under the current specification. These are usually designed with a return period of 10-years and building structure level of grade 5. However, flash flood is characterized by high velocity, strong striking force and severe destruction. In recent years, the return period of flash flood disasters exceed the design standards of flash flood ditch management. Considering the characteristics of flash flood disasters, this paper puts forward the ideas and concrete implementation methods for flood control management of mountain ditches with limited protection. Engineering measures should be laid out according to the distribution of the urban development, concentration on settlements and the important infrastructure in the mountain ditches. Regarding the specific design of engineering measures，local design for protective structures should improve the ability of anti-scour，increase the depth of foundation, improve the structure, and enhance the overturning safety factor against sliding based on flood control standards and regulations on building level. In order to cope with flash floods outside of the design standards, flash flood ditch control management should be combined with the monitoring and early warning system in small watershed. All of the above factors contribute to form an integrated defense system.
2016, Vol. 26 
