STORM RUNOFF AND INUNDATION RISK ANALYSIS USING 10 MINUTE PRECIPITATION OF NHRCM-5KM DATA IN THE UPPER KANDA RIVER WATERSHED

Abstract

In this study, NHRCM 5km rainfall data was used to create centralized rainfall with an annual excess probability of 1/20 for three periods (past (1980-1999), near future (2016-2035), and future (2076-2095)) We evaluated flood inflow and inundation risk in the upper Kanda River basin using the Tokyo Storm Runoff (TSR) model to evaluate the risk of inundation due to climate change. Flood runoff analysis confirmed that the increase in discharge during rainfall increases with age, so if the capacity of the reservoir is not different from the present, the increase in discharge downstream will be more pronounced than in the middle stream.