This heavy rain has been called for caution, saying, "There is a risk of heavy rain like the end of the rainy season."
If it continues to rain and the rain increases locally, the risk of sediment-related disasters may increase.
We have summarized the viewpoint of "hazard map" that allows you to check the risks around your house and the characteristics of sediment-related disasters.
How to read the hazard map?
The "hazard map" can be used as a reference when deciding to evacuate.
This is a method to check from a computer or smartphone.
The "Overlapping Hazard Map" published by the Ministry of Land, Infrastructure, Transport and Tourism is a site that allows you to overlay and display places at risk of sediment-related disasters and floods on a single map.
On the site, first select the "disaster type" you want to know.
Click icons such as "flood" and "earth and sand disaster" to display the locations at risk of disaster on the map.
Then enter the place you want to see in the space at the top of the screen and click the place you want to check in detail to understand the disaster risk of that place.
Prefectural governments have designated mountain streams that are at risk of debris flow as "debris flow dangerous mountain streams," and areas that are at risk of "landslides" are "landslide risk areas," and "landslide hazards" that indicate the danger of landslides. "Slope collapse danger points" are often indicated, so please check the risk of your place of residence.
Information on hazard maps and evacuation can also be found on the NHK website "Your Weather / Disaster Prevention" and "NHK News / Disaster Prevention App".
▽ "Hazard map portal site of the Ministry of Land, Infrastructure, Transport and Tourism"
https://disaportal.gsi.go.jp/
▽ NHK "Your weather and disaster prevention"
https://www.nhk.or.jp/kishou-saigai/hazardmap/
There are three main types of sediment-related disasters
It is a characteristic of sediment-related disasters.
There are roughly three types of debris flow, landslides, and landslides, and prefectures have designated areas that require evacuation in preparation for disasters as "earth and sand disaster warning areas."
Debris flow
"Debris flow" is a phenomenon in which a large amount of earth and sand mixed with water, stones, and rocks flow down along the valley, and it occurred in Atami City, Shizuoka Prefecture last month.
The speed of the flow can reach 20 to 40 km / h, and it also has the power to wash away wooden houses, making it difficult to evacuate after it occurs.
Landslide
"Landslide" is a phenomenon in which a mountain slope slowly slides down over a wide area, causing great damage by slipping down the entire slope on which a house is built or by rushing collapsed earth and sand into a village.
Rockfall
A "cliff collapse" is when the back mountain of a house soaked with rainwater or the steep slope of a mountain collapses at once.
Rockfalls can also occur suddenly.
The rate of deaths from sediment-related disasters is also high.
In the case of a "debris flow" that occurred in Atami City, it may not be helpful to escape to the second floor in a wooden house near a swamp.
It is important to move in advance to a sturdy building or a location that is less likely to be damaged.
Evacuation after a landslide disaster is difficult ・ Understand the risks in advance
It is extremely difficult to evacuate after a landslide disaster occurs.
▽ Water spouts from the slope
▽ Sounds such as mountain noise
▽ Smell may be accompanied by precursory phenomena, but it is already imminent and it is necessary to evacuate immediately after confirming.
You may not be in time.
It is important to understand the risks of your place of residence in advance and to ensure safety early before a disaster is imminent in order to save your life.
On the other hand, disasters can occur even in places where risks are not displayed on the hazard map.
Please be aware of your surroundings and local government information.
Front stagnation in August Damaged in the past
In August, the front line stagnated for a long period of time, causing great damage in the past.
Seven years ago (2014), from August 15th to 20th, the front stagnated near Honshu, and rain clouds spread over a wide area from Kyushu to Tokai around it.
By August 18, the first half of the period, 48-hour precipitation reached 341 mm in Fukuchiyama City, Kyoto Prefecture, and 48-hour precipitation reached 330.5 mm in Takayama City, Gifu Prefecture, which is August 1 of the average year. It rained nearly twice as much as a month, killing five people according to the Fire and Disaster Management Agency of the Ministry of Internal Affairs and Communications.
From the night of August 19th to the dawn of August 20th, which is the latter half of the period, the rain suddenly increased in Hiroshima City, and a linear precipitation zone occurred in a very limited area.
According to the Fire and Disaster Management Agency of the Ministry of Internal Affairs and Communications, 77 people died, including disaster-related deaths, due to local heavy rains such as rain gauges installed by the prefecture reaching 207 mm for two hours.
The Japan Meteorological Agency is calling for more detailed confirmation of the latest weather information.