Every time a storm or flood damage occurred, the national government, prefectures, and municipalities have cooperated to carry out restoration and reconstruction projects to prevent disasters again.
Kochi City has excellent ability to cope with heavy rain, and has one of the best drainage capacity in Japan at 77 mm / hour. Even if heavy rains occur at the level that caused a major disaster in the past, the same "disaster" will not occur in Kochi.
Residual risk to be infinitesimally zero
Certainly there are hazards that cannot be prevented. Trench-type earthquakes that occur in a cycle of about 100 years generate huge tsunamis with large tremors. In 2012, the Japanese Cabinet Office announced damage estimates for the largest possible Nankai Trough earthquake in the future. Kochi will be hit by the tsunami of 34.4m, the highest in Japan. It hits the entire coast and not only floods the center of the prefecture. In response to this announcement, the estimated number of fatalities is 42,000. This huge tsunami cannot be completely prevented. However, be able to challenge reduce the residual risks, can be save lives.
Kochi has accelerated and strengthened countermeasures against huge earthquakes. In all areas where inundation is expected, "evacuation facilities" were constructed at intervals that take into account the arrival time of the tsunami and the time that people can escape. The number of tsunami evacuation towers constructed was 114, and the number of evacuation routes leading to the hills was 1,445. Not only that, all measures have been taken across all sector and departments, and 282 action plans have been implemented.
As a result of these all-out measures against residual risk, the number of deaths currently expected has been reduced by 74% the first estimation by cabinet office in 2012 to 11,000. But it's not zero yet. Kochi's efforts continue today.