In this research, we gathered the Historical Maximum Discharge (HMD) of A class rivers in Japan after World War 2nd (1945) and classify these data into the topography-meteorological area. We used Creager curve for analyzing the regional characteristics of HMD. From this analysis, we explained the difference of the flood specific discharge among geographic regions. And we compared the historical maximum specific discharge between as of 1975 and 2009, so we could explain Creager curves in 3 region was updated and the flood specific discharge in most of river converged to Creager curve.
