PLUVIAL FLOODING AND SAFE EVACUATION IN DRAINAGE AREA WITH SMALL RIVERS

Abstract

 In recent years, fluvial flood damage has been mitigated by strengthening embankments, however, inundation by heavy rainfall is increasing in mega and provincial cities. Fukuchiyama is one of provincial cities and prone to fluvial flood. This city was frequently attacked by Yura river floods and damaged severely in years past. And then, pluvial floods in 2014 and 2018 brought hole city inundations. The drainage system includes small tributaries and those river water is pumped out. This system causes city inundation if pump stations can not work because water level of main river is high. In this paper, this kind of pluvial flood and safe evacuation are discussed. From the results, inundation characteristics and safety of evacuation center are clarified by using 2D shallow flow model.