Further descriptions of terms

Flood-assumed area

[Flood-assumed area]

Regarding the river forecasting floods and the river designated the river publicizing a water level, Ministry of Land, Infrastructure, Transport and Tourism and prefectures designates the areas assumed to flood when the said rivers overflow due to assumed maximum rainfall as a flood-assumed area in order to reduce flood damages through securing smooth and prompt evacuation in case of flood or preventing floods. Also, they publicize designated areas and assumed water depth and duration time of flooding in case of flood as a flood-assumed area chart. 
You find a list of target rivers and setting of rainfall on this city's website.  
*This city’s website “Flood hazard map in Hiroshima city”
(http://www.city.hiroshima.lg.jp/www/contents/1392362485710/index.html)

Possible sediment disaster areas

[Dangerous site of sediment disaster]

Dangerous site chart of sediment disaster indicates a site where there seems to be a damage risk due to sediment disaster in Hiroshima Pref. and it is shown to public for reference at the point of warning evacuation related to sediment disaster or considering land use. 
Therefore, acts etc. in the land area of dangerous site chart of sediment disaster are not regulated by law.
In addition, it is no proof of sediment disaster occurrence or damage area.  
In the region not designated sediment disaster special alert area etc. provided for in sediment disaster prevention law, evacuation warning etc. will be issued for within the area including dangerous site of sediment disaster before this is designated. 
In addition, information on dangerous site of sediment disaster is as of April 1, 2002.
It is not corresponding to a change of dangerous site due to changing the state of landform such as construction later etc.

[Sediment disaster special alert areas]

It is designated by Hiroshima Pref. based on sediment disaster prevention law enacted as a result from sediment disaster occurred on June 29, 1999 in Hiroshima city etc. In case of occurring collapse of steeply sloping ground, it is an area to be found that there is a threat to the life or body of residents etc., and notification of danger and establishment of a system for warning evacuation have been done.

[Sediment disaster emergency special alert areas]

It is designated by Hiroshima Pref. based on sediment disaster prevention law. In case of occurring collapse of steeply sloping ground, it is an area to be found that there is a highly threat to the life or body of residents etc., and licensing system for specified development activities or regulating structure of building etc. have been done.

Estimated storm surge and flood area 

[Estimated storm surge and flood area ]

In Hiroshima Pref, a chart of estimated storm surge and flood with estimated area and depth of flood in case of flood occurrence due to storm surge caused by typhoon is shown to public.
2 cases are estimated now; one case is occurring once every 30 years and another case is equivalent to Isewan typhoon.

Estimated tsunami and flood area 

[Estimated tsunami and flood area ]

In Hiroshima Pref, a chart of estimated tsunami and flood area with estimated flood area and depth of flood in case of occurring the largest tsunami under bad conditions is shown to public.
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