Rapid flood assessment using modified Geomorphic Flood Index (GFI) model based on flood event data: a case study at Cikapundung Watershed
Asep Ferdiansyah (a*), Eka Oktariyanto Nugroho (b), Edi Riawan (c), Agung Wiyono Hadi Soeharno (b), Aditya Rivandi (a), Mohammad Farid (b), Arno Adi Kuntoro (b)

(a) Water Resources Engineering Master^s Program, Bandung Institute of Technology, (b) Water Resources Engineering Research Group, Civil Engineering Study Program, Faculty of Civil and Environmental Engineering, Bandung Institute of Technology, (c) Science Atmosphere Research Group, Faculty of Earth Science and Technology, Bandung Institute of Technology

Abstract

This study contains the procedures to validate the inundation based on flood event in the modified Geomorphic Flood Index (GFI). The procedures also have capability to distinguish the causes of flood inundation in a watershed. The causes of inundation in the Cikapundung River are divided into 2 types. The first is inundation from the fluvial flood and the second is urban flood. The lack of rapid information of the low capacity of the river and obstruction flow of drainage water into the river as a result of the high river water level are the challenge in this research. Based on the validation results in the field indicate that the flood event data on inundation can be useful for modified GFI model to describe flood inundation rapidly as a result of drainage or urban flood and the inundation generated by fluvial flood. The procedure to validate the flood also be the main focus on this research as well as the modification of the original GFI by adding land use and effective rainfall ratio.

Keywords: modified geomorphic flood index- rapid assessment- flood event

Topic: Interdisciplinary Geosciences