SPATIAL FLOOD DAMAGE ESTIMATIONS BASED ON RELATIONSHIP BETWEEN EXTREME PRECIPITATION AND EXTREME DISCHARGE

Abstract

This study presented a method to assess the economical flood damages based on a hydraulic model, which took into account a spatial distribution of extreme precipitation estimated by statistical and meteorological characteristics. In order to calculate subsequent discharges due to an extreme precipitation, a regression relationship between catchment areas and coefficient of discharges was derived using the historical data of river discharges at 89 stations throughout Japan. The potential economic damage for a flood of 100-year return period was estimated to be 790 billion USD.