Abstract
In 2022, 14 people died due to wind and flood damage. At locations where casualties were
caused by floods, rivers, and landslides, any or all of the seven rainfall indicators exceeded
100%. Based on the past 4 heavy rain events from 2018 to 2021, we created an evaluation
function for the number of casualties per population using 7 indicators of heavy rain. In doing
so, the use of disaster risk population, which uses disaster risk information such as estimated
flood inundation areas, has improved the accuracy of the estimates. As a result of the estimation
using this evaluation function, the estimated results for three cases were roughly consistent with
the actual values. In the cases of heavy rain from August 3 and Typhoon No. 15, the estimated
results were slightly overestimated compared to the actual values.
