Disclaimer, etc.

  • The posted information is accurate, however, Hiroshima city will assume no responsibility on any matter of damage incurred on users or damage users gives to a third party due to using this service, irrespective of whether a direct or indirect damage.
  • This service will be temporarily stopped, discontinued and interrupted the operation. In addition, it will assume no responsibility on any matter of damage incurred on users due to this matter.
  • All information posted on this service is information at the point of time of updating information only. Names or contents etc. might be updated without any notice after posting, and differences between the posted information and real situation might arise due to an elapsed time.
  • In using this service, we regard as accepting this disclaimer.

About the landslide disaster warning judgment mesh information

In using mesh information on sediment disaster warning determination, require attention to the following points.

  • Use mesh information on sediment disaster warning determination with sediment disaster warning information, heavy rain warning (sediment disaster), heavy rain advisory.
  • Sediment disaster warning information, heavy rain warning (sediment disaster) and heavy rain advisory are issued comprehensively determining weather condition etc. Therefore, these announcement situations and mesh information on sediment disaster warning determination might not be matched.
  • Mesh information on sediment disaster warning determination determines the risk of occurring sediment disaster based on rainfall, and not based on reflecting vegetation, geology, weathering etc. in steep-slope etc. respectively or underground water flow etc. Therefore, each place, time, scale etc. of occurring disaster cannot be specified.
  • In using, focus on a stretch of warning area with a risk of surrounding of relevant 5 km mesh for reference, too. In addition, require to comprehensively determine not only by the mesh information on sediment disaster warning determination, but also by dangerous sites of sediment disaster or sediment disaster special alert areas within relevant mesh.
  • In the mesh information on sediment disaster warning determination, the process that snow accumulates on the surface of the ground as snow coverage or the process that rain soaks into the ground after melting snow are not considered. Therefore, the risk of occurring sediment disaster when snowing and snow melting will not be able to be expressed correctly always.

About the map for areas with the risk of landslide disasters

  • 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.
  • Field investigation was not conducted on making the map for areas with the risk of landslide disasters. It was made by means of extracting a range which meets certain geographical conditions by using a topographic map with a reduced scale of 1/25,000th. For this reason, please use the map with the understanding that it is a drawing of which boundaries were conveniently determined on a topographic map.
  • The information on the areas with the risk of landslide disasters provided on this page are 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.

About the map for areas with a warning / special warning for landslide disasters (hereinafter referred to as "map for areas with a warning for landslide disasters")

  • For the map for areas with a warning for landslide disasters, areas with a possibility to experience landslide disaster are investigated through a method that was provided in the Landslide Disasters Prevention Act, and is opened to the public according to the mentioned act.
  • On making the map for areas with a warning for landslide disasters, a topographic map with a reduced scale of 1/25,000th was used to extract an area which meets certain geographical conditions, and field investigation is conducted at the same time to determine its boundaries.
  • As mentioned above, the boundaries of the map for areas with a warning for landslide disasters are determined not only through investigation on a topographic map but also through field investigation. Therefore, it is based on a more detailed investigation results compared to the map for areas with the risk of landslide disasters.
  • However, the map for "areas with a warning / special warning for landslide disasters" (hereinafter referred to as "map for areas with a warning for landslide disasters") which is provided on this page is a reference drawing that shows approximate positions and is not one that specifies the boundaries of an area with a warning, etc. Moreover, it does not include all information on the Landslide Disasters Prevention Act. (Please use our service with enough understanding of the contents shown on this page.)
  • The information on the Landslide Disasters Prevention Act provided on this page is not a material on the mentioned act that is designated by law, nor does it verify the contents of specified areas with a warning for landslide disasters, etc. according to the mentioned act.
  • For more detailed information on contents you would like to know such as materials for real estate transactions, etc. and the like which incurs obligations, please inquire at a window in charge of Promotion Designated by the Sediment Act at the municipality of your residence, a construction office (branch office) which is a local institution of Hiroshima Prefecture, or Hiroshima Prefecture Civil Engineering and Construction Office.

About the map for areas expected to experience inundation due to flood (except for Oota River)

  • The map for areas expected to experience inundation which is opened to the public through the Internet, is one wherein the map for areas expected to experience inundation made by Hiroshima Prefecture and the inundation height announced along with it is transferred to a topographic map with a reduced scale of 1/25,000th. The map for areas expected to experience inundation which is opened to the public here, does not verify the areas expected to experience inundation and the inundation height. Moreover, if the map is zoomed to an extent that exceeds its accuracy, a gap will occur between the specified area and the area expected to experience inundation and its inundation height.
  • The information on the map for areas expected to experience inundation are as of the end of July 2015.

※The map for areas expected to experience inundation was made by simulating the estimated situation of inundation in case a river overflows. The overflowing of branch streams, rainfall that exceeds the estimation, overflowing due to landslide waters, etc. were not taken into consideration, so there is a possibility for inundation to occur in areas that were not specified in the areas expected to experience inundation, and there may be a difference between the estimated depth of water and the actual inundation height.

About the map for areas expected to experience inundation due to flood (Oota River)

  • This figure shows the specified areas within Oota River Water System Oota River's stretch designated for flood forecasting which are expected to experience inundation according to the Flood Control Act, and the depth of water and other information in case each area experiences inundation.
  • The areas expected to experience inundation, etc. were found by simulating the estimated situation of inundation in case Oota River overflows due to heavy rain that occurs once in about 200 years, which is the standard rainfall in the plan about flood control, while taking into consideration the maintenance status of Oota River's river channel on the time of designation, and the status, etc. of facilities such as flood regulation facilites in Nukui Dam, etc. and Oota River Discharge Channel, etc.
  • However, the mentioned simulation does not take into consideration the overflowing of branch streams, rainfall that exceeds the estimation, high tide, overflowing due to landslide waters, etc., so there is a possibility for inundation to occur in areas that were not specified in the areas expected to experience inundation, and there may be a difference between the estimated depth of water and the actual inundation height. Moreover, the occurrence of landslide disasters such as collapse of a steep slope, debris flow, landslide, etc. are not taken into consideration.

About the map for areas expected to experience inundation due to high tide

  • The map for areas expected to experience inundation due to high tide shows the areas with a possibility to incur damages due to a high tide disaster. It is opened to the public for the purpose of having them use it as a reference when evacuating because of a warning for high tide disaster and when considering land utilization. Therefore, the boundaries of land shown in the map for areas expected to experience inundation due to high tide does not mean restriction of actions, etc. by law. Moreover, it does not verify the occurrence of high tide disasters or the extent of damages.
  • The map for areas expected to experience inundation due to high tide was made by simulating the estimated inundation in case a high tide of an estimated scale occurs, while taking into consideration the current status of coast defense facilities at the time of investigation. However, the overflowing of rivers, overflowing due to landslide waters, and inundation due to a high tide with a scale that exceeds the estimation are not taken into consideration. Therefore, there is a possibility for inundation damages to occur in areas that were not specified in the areas expected to experience inundation due to high tide, and there may be a difference between the estimated inundation height and the actual height.

※On the map for areas expected to experience inundation due to high tide, simulation was made on which areas are likely to experience inundation on the condition of the current landform and land untilization, and on the assumption that the existing high tide embankment, etc. will not be damaged. Areas that experience inundation changes when a typhoon which is out of the estimation strikes, or facilities are damaged, or because of land embankments, etc.

※Caution is necessary as there is also a possibility for inundation to occur in places that are not colored in the map, due to wave overtopping, reverse currents from waste pipes, overflowing of rivers, rain waters and landslide waters.

About the map for areas expected to experience inundation due to tsunami

  • The map for areas expected to experience inundation due to tsunami which is opened to the public through the Internet, is one wherein the map for areas expected to experience inundation due to tsunami made by Hiroshima Prefecture and the inundation height announced along with it is transferred to a topographic map with a reduced scale of 1/25,000th. The map for areas expected to experience inundation which is opened to the public here, does not verify the areas expected to experience inundation and the inundation height. Moreover, if the map is zoomed to an extent that exceeds its accuracy, a gap will occur between the specified area and the area expected to experience inundation and its inundation height.

About the map for areas expected to experience inundation due to landslide waters

  • The estimated inundation is in case a rainfall amount of 81mm per hour pours equally on the whole area of sewege facilities managed by Hiroshima City Waterworks Bureau at the point of time specified below.
    (1) Kakomachi/Yoshijima/Kounan District
      March 2014 (Heisei 26)
    (2) Hakushima/Noborimachi/Ootemachi/Kyoubashi District
      March 2015 (Heisei 27)
    (3) Honkawa-cho/Funairi/Eba District
      March 2016 (Heisei 28)
    (4) Hesa District
      November 2012 (Heisei 24)
    (5) Kaniya/Oozu/Yaga District
      March 2008 (Heisei 20)
    (6) Minamimachi/Asahimachi/Ujina District
      2014 (Heisei 26)
    (7) Misasa/Yokogawa/Nakahiro/Kan-on District
      March 2014 (Heisei 26)

※The rainfall amount of 81mm per hour is the largest rainfall among the observed data by public institutions such as Hiroshima Local Meteorological Observatory, etc. between year 1888 (Meiji 21) to year 2013 (Heisei 25). 【It was observed on June 29, 1999 (Heisei 11) at Saeki District.】

※Take caution as there is a possibility for inundation to occur in areas aside from the areas expected to experience inundation in case a locally intense rain falls.

※Take caution as there is a possibility for areas lower than the roads to experience a inundation that exceeds the estimation, because the areas expected to experience inundation are estimated with road heights as the standard.

About the map for elementary school districts

  • This was made with a reduced scale of 1/40,000th to serve as a standard for the map for elementary school districts.
  • If the map is zoomed to an extent that exceeds its accuracy, there may be a difference with the actual area. Please use it as a reference when taking evacuation actions, and check the website of Hiroshima City for details on the actual roads when commuting to elementary schools.
  • Moreover, this data is as of March 2016, so there may be a difference with the current areas.

About the map for information on disaster prevention

  • On the map for information on disaster prevention, information such as danger zones, refuge places, etc. can be checked while using various maps such as Chiri-in (Geospatial Information Authority) Map, Google Map、Open Street Map, etc.
  • There is a restriction on the usage of these maps as the copyright belongs to the legal entities that provided them.
  • Please check the details through the provider of each background map.

About Chiri-in (Geospatial Information Authority) Map (background map)

  • This was copied from the electronic topographic map published by the Geospatial Information Authority of Japan with the approval of the head of the mentioned authority.
  • If a third party wants to further make a copy, the approval of the head is required.

About Google MAP (background map)

  • Google MAP may not be shown if the number of access increases. In such case, please select other background maps from the top of the map.

About the use of Google Analytics

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