Explanation of legend |
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Explanation of Symbols on Map |
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Landslide Warning ZoneThis is an area where, due to landslides, there is a risk of danger to the lives or bodies of its residents. Improvements to the transmission of information and warning and evacuation arrangements are underway. |
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Landslide Emergency Warning ZoneThis is an area where, due to landslides, structures and buildings have collapsed and pose a severe risk of danger to the lives or bodies of its residents. Structural restrictions to buildings, limitations to specific development activities, etc. are underway. |
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Planned locations for basic surveyThe region is the result of extracting hazardous areas using a numerical elevation model, and a detailed survey will be conducted in the future. |
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Broad-Area Evacuation SiteA reasonably open space where you can protect yourself from disasters affecting broad areas such as large earthquakes. |
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Designated Emergency Evacuation SiteA place or institution such as a park, a school gymnasium, or a schoolyard where you may temporarily secure your safety. |
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Designated Emergency Evacuation Site and Designated Emergency Evacuation ShelterThis is a facility that offers temporary logding in the case that one's loses their home, or their place of residence becomes too damaged or unsafe to live in. It is equipped with both a designated emergency evacuation shelter and a designated emergency evacuation site. |
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Tsunami Evacuation BuildingThis is a temporary emergency evacuation location that aims to protect the lives of citizens from tsunamis, a disaster which may occur at anytime. |
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UnderpassThe road beneath an overhead crossing that is excavated and dug into the ground. There are occasions when, due to heavy rain, the road becomes flooded and it is not possible to pass through. |
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Facilities for Those Requiring Special CareSocial welfare facilities, schools, medical facilities and other facilities which are mainly used by those requiring special care, and are located in areas prone to flooding or sediment-related disaster special warning areas, are listed in the Regional Disaster Prevention Plan. |
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Underground
Facilities located in areas prone to flooding are listed in the Regional Disaster Prevention Plan. In the case of heavy rain, there is also a possibility that the facility may flood.
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Flood Depth (Planned Scale)Displaying the water depth and the estimated flooded region when a river overflows due to rainfall that could occur approximately once every 50 years.*Applies to the following rivers: Kashimagawa River, Konakakawa River, Miyako River, Yoshikawa River, Shisenmiyako River, Sakatsuki River, Muratagawa River, Mikada River |
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| More than 0.01m, less than 0.5m | |
| More than 0.5m, less than 1m | |
| More than 1m, less than 2m | |
| More than 2m, less than 3m | |
| More than 3m, less than 5m | |
| More than 5m, less than 10m | |
Flood Depth (Estimated Maximum Scope)Displaying the water depth and the estimated flooded region when a river overflows due to rainfall that can occur approximately once every 1,000 years.*Applies to the following rivers: Kashimagawa River, Konakakawa River, Miyako River, Yoshikawa River, Shisenmiyako River, Sakatsuki River, Muratagawa River, Mikada River, Inba Flood Bypass, Katsuta River, Hamada River, Hanano River, Oyumi River, Kikuta River |
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| More than 0.01m, less than 0.5m | |
| More than 0.5m, less than 1m | |
| More than 1m, less than 2m | |
| More than 2m, less than 3m | |
| More than 3m, less than 5m | |
| More than 5m, less than 10m | |
Inundation Duration TimeDisplays the estimated amount of time needed for water levels to ultimately reach below 0.5 meters after they have surpassed more than 0.5 meters when flooding occurs due to rainfall that could occur approximately once every 1,000 years. |
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| less than 12 hours | |
| More than 12 hours, less than 24 hours | |
| More than 24 hours, less than 72 hours | |
| More than 72 hours, less than 168 hours | |
| More than 168 hours, less than 336 hours | |
Area with Buildings at Risk of Collapse due to Flooding (Flow of Inundation)Displaying the areas that are at risk of houses collapsing or running off due to the flow of floodwater following rainfall that can occur approximately once every 1,000 years. |
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| Flow of Inundation | |
Area with Buildings at Risk of Collapse due to Flooding (Riverbank Erosion)Displaying the areas that are at risk of houses collapsing or running off due to riverbank erosion when a flood occurs following rainfall that can occur approximately once every 1,000 years. |
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| Riverbank Erosion | |
Flood Depth (Estimated Maximum Scope)Displaying the water depth and the estimated flooded region when inland waters that cannot be treated by the existing drainage systems flood over due to rainfall that can occur approximately once every 1,000 years. |
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| More than 0.01m, less than 0.5m | |
| More than 0.5m, less than 1m | |
| More than 1m, less than 2m | |
| More than 2m, less than 3m | |
| More than 3m, less than 5m | |
| More than 5m, less than 10m | |
Inundation Duration TimeDisplaying the estimated amount of time needed for water levels to ultimately reach below 0.5 meters after they have surpassed more than 0.5 meters when inland waters that cannot be treated by the existing drainage systems flood over due to rainfall that can occur approximately once every 1,000 years. |
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| less than 12 hours | |
| More than 12 hours, less than 24 hours | |
| More than 24 hours, less than 72 hours | |
| More than 72 hours, less than 168 hours | |
| More than 168 hours, less than 336 hours | |
Flood Depth (Estimated Maximum Scope)Displaying the water depth and the estimated flooded region when flooding occurs due to storm surges following a typhoon that can occur approximately once every 1,000-5,000 years. |
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| More than 0.01m, less than 0.3m | |
| More than 0.3m, less than 0.5m | |
| More than 0.5m, less than 1.0m | |
| More than 1.0m, less than 3.0m | |
| More than 3.0m, less than 5.0m | |
| More than 5.0m, less than 10.0m | |
| More than 10.0m, less than 20.0m | |
Inundation Duration TimeDisplays the estimated amount of time needed for water levels to ultimately reach below 0.5 meters after they have surpassed more than 0.5 meters when flooding occurs due to storm surges following a typhoon that can occur approximately once every 1,000-5,000 years. |
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| less than 12 hours | |
| More than 12 hours, less than 24 hours | |
| More than 24 hours, less than 72 hours | |
| More than 72 hours, less than 168 hours | |
| More than 168 hours, less than 336 hours | |
Expected Seismic IntensityDisplaying the likeliness of tremors and shaking presuming that an earthquake occurs directly underneath Chiba City. |
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| Seismic Intensity 5-upper | |
| Seismic Intensity 6-lower | |
| Seismic Intensity 6-upper | |
Degree of Liquefaction RiskDisplaying the degree of liquefaction risk presuming that an earthquake occurs directly underneath Chiba City. |
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| High Risk of Liquefaction | |
| Slightly High Risk of Liquefaction | |
| Low Risk of Liquefaction | |
| Very Low Risk of Liquefaction | |
Degree of Steep Slope Collapse RiskDisplaying the degree of steep slope collapse risk presuming that an earthquake occurs directly underneath Chiba City. |
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| Area at High Risk | |
| Area at Risk | |
| Low Risk | |
Estimated Structural Damage (Overall)Estimating and displaying the overall structural damage caused by liquefaction, steep slope collapse, tremors, and fire, presuming that an earthquake occurs directly underneath Chiba City. |
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| Property Damage Rate more than 20% | |
| Property Damage Rate more than 10%, less than 20% | |
| Property Damage Rate more than 5%, less than 10% | |
| Property Damage Rate less than 5% | |
Estimated Structural Damage (Liquefaction)Displaying the estimated structural damage caused by liquefaction presuming that an earthquake occurs directly underneath Chiba City. |
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| Property Damage Rate more than 20% | |
| Property Damage Rate more than 10%, less than 20% | |
| Property Damage Rate more than 5%, less than 10% | |
| Property Damage Rate less than 5% | |
Estimated Structural Damage (Steep Slope Collapse)Displaying the estimated structural damage caused by steep slope collapse presuming that an earthquake occurs directly underneath Chiba City. |
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| Property Damage Rate more than 20% | |
| Property Damage Rate more than 10%, less than 20% | |
| Property Damage Rate more than 5%, less than 10% | |
| Property Damage Rate less than 5% | |
Estimated Structural Damage (Shaking)Displaying the estimated structural damage caused by tremors and shaking presuming that an earthquake occurs directly underneath Chiba City. |
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| Property Damage Rate more than 20% | |
| Property Damage Rate more than 10%, less than 20% | |
| Property Damage Rate more than 5%, less than 10% | |
| Property Damage Rate less than 5% | |
Estimated Structural Damage (Fire)Displaying the estimated structural damage caused by fire presuming that an earthquake occurs directly underneath Chiba City. |
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| Property Damage Rate more than 20% | |
| Property Damage Rate more than 10%, less than 20% | |
| Property Damage Rate more than 5%, less than 10% | |
| Property Damage Rate less than 5% | |
Flood Depth (Planned Scale)Displaying the water depth and estimated flooded region when a tsunami that has a high occurrence frequency and is very destructive despite being low in height occurs. |
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| More than 0.01m, less than 0.5m | |
| More than 0.5m, less than 1m | |
| More than 1m, less than 2m | |
| More than 2m, less than 3m | |
| More than 3m, less than 5m | |
| More than 5m, less than 10m | |
Flood Depth (Estimated Maximum Scope)Displaying the water depth and estimated flooded region should an improbable but highly destructive tsunami occur. |
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| More than 0.01m, less than 0.5m | |
| More than 0.5m, less than 1m | |
| More than 1m, less than 2m | |
| More than 2m, less than 3m | |
| More than 3m, less than 5m | |
| More than 5m, less than 10m | |
For Real Estate AgentsPlease read this guide first before explaining important matters when making real estate transactions.For Real Estate Agents |
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Terms of UseThe conditions of assumed damage caused by each disaster (earthquakes, Tsunami, flood, internal water, high tide) are described.Terms of Use |
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Status UpdatesThe status updates of each the verifiable contents of the hazard maps can be accessed from the link below.Status Updates |
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Flood Damage Hazard Map, based on the Flood Control ActView each layer of the hazard map by type of flood damage (flooding, internal water, storm surges), and check the risk of flood damage of the target areas.Flood Damage Hazard Map, based on the Flood Control Act |
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