The aim of this study is to improve Potential Flood Damage(PFD) that a flood risk assessment technique used in the
National Water Resource Plan comprehensive plan for water resources, which is a top-level plan related to domestic
water resources and Flood Risk Indices. Both methods are used to evaluate flood control risks. However, there is a
problem of reliability because the problem of data utilization and the damage that occurred in a specific area are
applied as an average concept. Therefore, this study improved the method for analysis by components and the flood
inundation area was limited to flood damage area. Also, the improvement of the method and the application of the
recently provided GIS data to the flood damage prediction area were proposed to improve the usability of the existing
method. The existing analysis method and the improved method were applied to the test watershed by each case.