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Ishikari River basin had gotten extensive damage from flood frequently. After flood preventions such as channel cutoff works, levee construction and dam construction etc., each region protected by the levee has become to have flood damage independently in Ishikari River basin. The different characteristics of flood damage can be seen in each region corresponding to characteristics of inundations population and land use etc. in the region. Flood characteristics of Ishikari River basin are composed of those of each region. We investigated the flood characteristics of each region in order to clarify the damage characteristics for flood exceeding the designed level in Ishikari River basin.