Flood Management at Narrow River Mouth

Abstract

Hiji River is characterized by many tributaries, low bed gradient, and narrow river mouth. Due to these characteristics, several floods occurred in the past. The narrow river mouth is the main reason of flood occurrence in Hiji River. The current study is focusing on the rainfall event which caused massive damage in 2004. The purpose of the current study is to update the existing hazardous map and compare the simulation results obtained from International River Interface Cooperative (iRIC) with the measured data to calibrate the model. The simulation was carried out using Nays2DH within the measured data record from Japan Ministry of Land, Infrastructure, and Transport. The analysis result was compared with the inundated areas and almost have the same results.