# Assessment Map for When to Evacuate during Flood and Sediment Disasters
The Assessment Map for When to Evacuate during Flood and Sediment Disasters shows you what actions to take and when to take them. It is based on the flooding depth, areas where houses may collapse, and the duration of flooding calculated by the Ministry of Land, Infrastructure, Transport and Tourism (MLIT) and Saitama Prefecture on the assumption of flooding due to heavy rainfall with a probability of about once in 1000 years, as well as areas where human casualties may occur due to sediment disasters as estimated by Saitama Prefecture.
Determination of When to Evacuate during Flood and Sediment Disasters, which appears when you select a location, will help you understand the hazard level of your home.
In the event of a disaster, please act at your own discretion
The Assessment Map for When to Evacuate is merely based on one estimated scenario. An actual flood may not occur as estimated. Please pay attention to various information in the event of heavy rain and what is going on around you, and take appropriate action at your own discretion.
# Flood-Prone Area Map
This section shows the Flood-Prone Area Map and Flood Hazard Information Map created by the Ministry of Land, Infrastructure, Transport and Tourism and Saitama Prefecture by river and flood scale.
- Select a river for which you wish to view flooding estimates.
- Select a flood scale for which you wish to view flooding estimates.
|Planned scale||Flooding due to rainfall targeted for river maintenance|
|Assumed maximum scale||Flooding due to rainfall with a probability of once in around 1,000 years|
- Select the type of information to display here.
|Flooding depth||Maximum flooding depth|
|Flooding duration||The time during which a flood of 50 cm or deeper continues |
* This option can be selected only if the flood scale is the assumed maximum scale.
About the "Flood-Prone Area Map"
With regard to the rivers mentioned in Article 14 of the Flood Control Act, flood-prone areas resulting from the heaviest rainfall assumed are specified and the flooding depth, etc. is publicized to ensure smooth and quick evacuation in the case of a flood and to prevent floods, thereby reducing flood damage.
Flood-Prone Area Maps that may affect Fukaya City: the Tone River, the Arakawa River, the Koyamagawa River, the Karasu River and the Kanna River
About the "Flood Hazard Information Map"
This map shows flood-prone areas and flooding depth in cases where a river that is not within the scope of the Flood Control Act but is managed by the prefecture overflows, in the same manner as the Flood-Prone Area Maps.
Flood Hazard Information Maps that may affect Fukaya City: upper reaches of the Arakawa River, the Koyamagawa River Basin, the Kanna River, Fukukawa River and Yoshino River basin, and the Gojinba River basin
# Sediment Disaster Alert Area Map
- This map shows the sediment disaster alert areas designated by Saitama Prefecture.
# Type of sediment disasters
|Collapse of steep slopes||Cases where water seeps into the ground and loosens a slope, which then collapses rapidly due to the effects of rain, earthquakes, and so on|
# Sediment Disaster Alert Areas and Sediment Disaster Special Alert Areas
|Sediment Disaster Alert Area||An area of land where it is recognized that there is a risk of harm to the lives or health of residents in the event of collapse of a steep slope and where a warning and evacuation system should be specially developed to prevent sediment disasters|
|Sediment Disaster Special Alert Area||An area of land which falls under the Sediment Disaster Alert Areas mentioned above, where it is recognized that there is a great risk of harm to the lives or health of residents due to damaged buildings in the event of collapse of a steep slope and where certain development activities should be restricted and the structure of buildings with residential rooms should be regulated|
# Estimated Earthquake Damage
This section shows the estimated damage that may be caused by the “Kanto Plain Northwest Margin Fault Zone Earthquake” prepared by Saitama Prefecture.
-Select the type of estimated earthquake damage you wish to view here.
|shakiness||The shaking of the ground surface in the area which is assessed as seismic intensity|
|Liquefaction hazard level||The possibility of liquefaction in the area|
"Shaking" indicates the level of shaking of the ground surface of the area in the case of an earthquake in the Kanto Plain Northwest Fault Zone (magnitude 8.1, assuming that the hypocenter is located in the north), which is assessed as seismic intensity from the viewpoints of the ground condition in the area and earthquakes that can occur there, and is expressed in a 50-meter mesh. In addition, if the location of the epicenter or the magnitude of the earthquake is different, the shaking of the ground surface in the area may be stronger or weaker than the seismic intensity shown on the map.
About "liquefaction hazard"
"Liquefaction hazard" indicates the possibility of liquefaction in the area, assuming that loose sandy ground containing enough water is shaken violently by a strong earthquake with the seismic intensity shown in "shaking." The possibility of liquefaction is determined by an index indicating the degree of liquefaction of the ground. Liquefaction may not occur if the location of the epicenter or the magnitude of the earthquake is different.
About "scenario earthquakes"
In the earthquake damage assumptions survey conducted by Saitama Prefecture in 2013, five earthquakes were used as scenario earthquakes, referring to the latest results from the National Disaster Management Council and Headquarters for Earthquake Research Promotion. This hazard map shows hazard levels using the "Kanto Plain Northwest Fault Zone" (assuming that the epicenter is located in the north), which may have a major impact on Fukaya City, as a scenario earthquake.
For details of earthquake damage assumed by Saitama Prefecture, please see below.
# Shelters and evacuation sites
This section shows shelters and evacuation sites that can provide relief during disasters as of January 2022.
|Shelter||A building where you can take shelter in the event of a disaster. However, some facilities may not be available for certain disasters.|
|Evacuation site||A place to seek shelter in to protect your life in the event of a disaster. However, some sites may not be available for certain disasters.|
Please be careful
Most evacuation sites are parks and grounds, and have no roofs over them. In addition to bringing emergency items, you should be prepared to shelter from the wind and rain.
# List of shelters and evacuation sites
- This section provides a list of shelters and evacuation sites available as of January 2022. You can search them by name, or check their location or the disaster types they are designed for.