Hydrodynamic Modelling of Flood Inundation on Welang River, Indonesia

Abstract

: A flood inundation in a river can be caused by an increase in river water level due to the addition of water discharge from both the rainfall and the tides from the sea. Flood inundation simulation can be done by using a numerical flood model flood model. In the Welang basin, floods occur every year and cause many problems. Floods that occurred on April 29, 2019, caused the closure of national and regional roads and many houses that were flooded. In the present study, flood model was carried out by using MIKE FLOOD software. Semare Village and Tambakrejo Village are critical points where floods occur. The depth of the water from the simulation model occurs 0.3 m - 2.2 m compared to the flood map report by the Indonesian National Disaster Management Agency which estimates it at 0.1 m - 1.5 m.