2019 Volume 75 Issue 2 Pages I_97-I_102
Heavy rainfall caused severe flood disasters across the western Japan in July 2018. In order to prevent frequent inundation in the downstream reaches where river improvement works have not been completed, a reservoir is often operated to deal with small or medium scale of floods by regulating its release discharge to a smaller values than that originally designed. This operation, however, can increase the risk of severe flood inundation in case of large floods, because water stored in the reservoir increases faster to the full storage volume, thus the flood control function is eliminated. This study aims at analyzing impacts of flood control operation rule for various scales of floods including large scale flood events using rainfall runoff inundation analysis in order to identify effective operation policy for flood risk reduction.
PROCEEDINGS OF HYDRAULIC ENGINEERING
