Disaster Preparedness | Flood and Landslide Information Decisions, Set 4

Flood Kikikuru shows flood risk in five color levels along river channels. It does not show shelter crowding or damage photographs. The colors help assess rising risk, but municipal evacuation information and route safety must also be checked.

Flood Kikikuru uses observed values such as the basin rainfall index together with forecasts up to three hours ahead. It can therefore show rising risk before obvious local flooding. It does not guarantee damage at a particular home, so updated and municipal information remain necessary.

Flood Kikikuru is an important source for checking rising flood risk on smaller rivers that are not covered by designated river flood forecasts. A shelter list helps identify destinations but does not show the river’s risk. Municipal evacuation information should also be checked.

For external flooding on a designated flood-forecast river, check designated river flood forecasts and the Flood Risk Line for nationally managed rivers. The hatched Flood Kikikuru display mainly represents backwater-type inland flooding associated with a swollen river.

The hatching indicates the risk of backwater-type inland flooding, in which a swollen main river contributes to overflow from tributaries or sewers. It is not confirmation of a levee breach. Check designated river flood forecasts separately for external flooding.

Risk from river backflow can remain after the rain stops or the display disappears. While Level 4 Flood Danger Information remains in effect, continue monitoring official information and confirm that the route is safe before returning or moving.

A flood inundation assumption map provides projected inundation areas, depths and durations for a maximum-scale assumed rainfall event. These support decisions about safe floors, supplies and early evacuation, while actual flooding may still differ from the projection.

In an assumed building-collapse flood zone, powerful floodwater or riverbank erosion may collapse or wash away a home. Moving upstairs alone does not address structural loss, so plan to evacuate outside the zone while routes remain safe.

Underground spaces make surface conditions difficult to see, can fill rapidly and have limited escape routes. Move people to safety while the exits remain usable. Protecting merchandise must not consume the available evacuation time.

Early evacuation outside the landslide risk zone is the rule. If outdoor movement has already become dangerous, moving upstairs and away from the slope is a last-resort emergency safety measure. It does not guarantee safety, which is why earlier evacuation matters.