### a. Clearly indicating the areas at risk of sediment-related disasters

In order to inform residents of the risk of sediment-related disasters and promote designation of sediment-related disaster hazard areas, prefectural governments must publicize the results of baseline survey. The baseline survey is scheduled to be completed within about 5 years.

### b. Delivering the information contributing to the smooth issuance of evacuation warnings and orders

In order to contribute to the appropriate issuance of evacuation orders by municipal governments, Sediment Disaster Alert is stipulated in laws, the prefectural government must deliver the relevant information to the municipal government and ordinary people. Upon receipt of the information concerned, the municipal government basically needs to issue an evacuation order immediately. When a municipal government asks for an advice on cancellation of an evacuation order, the national or prefectural government must give a necessary advice.

### c. Improving and strengthening the evacuation systems

In order to improve and strengthen the evacuation systems such as securing the places for evacuation, municipal disaster prevention plans will be created to define evacuation shelters, routes and disaster drills for individual sediment-related disaster hazard areas. In addition, transmission way of Sediment Disaster Alert to the social welfare facilities, schools, and medical facilities will be determined.

Also, in order to promote creation of hazard maps by municipalities, prefectural governments will support the creation by providing municipalities with electronic maps, prepare a report summarizing the progress of the creation, and submit the report to the national government.

### d. Assistance from National Government

The national government will have to help prefectural and municipal governments take sediment-related disaster measures by giving the advice necessary for them.

The recent revision of the law allows the residents to know the risk of sediment-related disasters as early as possible and made the relation among national, prefectural, and municipal governments more concrete. With the abovementioned points in mind, sediment-related disaster prevention measures will be promoted further by promoting close collaboration between administrative organs and by strengthening the warning and evacuation system.

Source) MLIT

Disaster situation of Yagi area

### h. Countermeasures for Large Scale Sediment-related Disasters

In order to reduce the damages caused by deep-seated catastrophic landslide, combination of structural and non-structural measures are taken by, for example, development of sediment-related disaster prevention facilities as well as strengthening of the warning and evacuation system by use of deep-seated catastrophic landslide risk evaluation maps.

If there is a risk of a natural damming of a river (landslide dams) or debris flows following volcanic eruptions, urgent survey are conducted in accordance with the “Sediment Disaster Prevention Act” to provide municipalities with information on the land areas vulnerable to sediment-related disasters as well as the timing of occurrence. In recent years, sediment-related disasters have occurred frequently due to localized rainfalls more concentrated and intensified and