Abstract
Models enable to reproduce an estimate river discharge considering the influence of flood inundation and flood inundation decrease of particular places in a basin by calculating from rain-runoff to flood inundation integrally. Furthermore, the influence of flood control by dam on the river water level and the inundation can be assessed quantitatively by reflecting dam operation into such models. In this study, the dam program for the Rainfall-Runoff-Inundation (RRI) model was developed, and then the effect of flood control by dams in Kinugawa River in 2015.09 Kanto-Tohoku Heavy Rainfall was analyzed. The effect of dams was quantified using the scenario calculation when there was no dam upper reaches. This study confirmed the effect of flood control by dams in upper Kinugawa River from the result that the peak river water level was decreased approximately 1 meter, and the area of inundation above floor level was decreased by approximately 20% by flood control.
