This study used meteorological data compiled at the
weather observatory of each city from 2003 to 2009. In
these data, precipitation (mm) and wind speed (m/s)
were reported. For precipitation, total daily precipitation
was calculated. In cases where there were several observatories
in a subject area, average daily precipitation
recorded by each observatory was calculated, and then
used as daily mid-level of each area. For wind speed,
daily highest wind speed was calculated. Where there
were several observatories in a subject area, an average
daily highest wind speed was calculated, and then used
as daily mid-level of each area.
A special disaster zone designation system was
introduced in accordance with natural disaster law in
2002. The Central Disaster Preparedness Center, in the
Ministry of Government Administration and Home Affairs,
suggested that the President declare, as Special
Disaster Protection Zones, such areas as he deemed
necessary and the committee allowed