Landslide threatened zones represents the sites susceptible to landslide. Landslide threatened zones are identified by the investigation based on topographic map and historical record of sediment-related disasters.
The first step of investigation is the inspection using aerial photograph and topographic map to identify the sites susceptible to landslide.
Another way to investigate is a dialog between local people to hear historical record of sediment-related disasters and a symptom of landslide.
If there are houses or public facilities in the threatened zones, Ministry of Construction prevented these zones. While, the threatened zones occupied by farms or forests are prevented by the Forest Agency belong to the Ministry of Agriculture, Forest and Fisheries.
In our prefecture, we conducted the investigation of the landslide threatened zones based on the national guideline in 1997.
According to this investigation, there are 495 landslide threatened zones, which should be prevented by Ministry of Land, infrastracture and Transport.

Bosai data station

| Bosai data station top |

| Streams that posed the danger of debris flows | Landslide threatened zones | in Wakayama

| Dangerous area of slope failure | in Wakayama

| Protect yourself against Sediment-related disaster | The present condition of rainfall |

| The present condition of water level |