Abstract
Disasters caused by the flow including sediment on mountainous roads have been reported. Bridge type designs are typically used in highway construction to prevent debris flow. Commonly, cost-effective countermeasures against the debris flow including Sabo dams have been used. Furthermore, road banking for changing the debris direction and trapping sediment have been applied. However, banks must be designed to restrict the surface flow ingress. In this paper, a new structure is proposed as following: install drainage routes pass beneath the highway banking, and improve drainage underpass designs to separate water from debris effectively. Experimental data for the separation with steel have been presented and discussed.
