Spatial Modeling of High Flood Risk Region in the Cikapundung River Basin using HEC-RAS 2D Model: Enhancing Regional Mitigation Planning Willy Cahyadhiputra Gunawan (a*), Jovian Javas (a), Imam Maulana Yosa (b), Rusmawan Suwarman (b), Mohammad Farid (a, c) and Mohammad Bagus Adityawan (a, c)
a) Water Resources Development Center, Institut Teknologi Bandung, Indonesia
b) Atmospheric Sciences Research Group, Department of Meteorology, Faculty of Earth Sciences and Technology, Institut Teknologi Bandung, Indonesia
c) Water Resources Engineering Research Group, Faculty of Civil and Environmental Engineering, Institut Teknologi Bandung, Indonesia
* willycgppsda[at]gmail.com
Abstract
The Bandung basin, particularly the Cikapundung river basin, is highly susceptible to recurrent flooding due to its significant rainfall levels, making it one of the most flood-prone regions in Indonesia. These frequent floods have severe consequences for Greater Bandung, the administrative center of West Java, disrupting infrastructure, public safety, and local economic activities. To effectively mitigate these risks, it is essential to have a comprehensive understanding of the flood hazard levels within the river basin. This study focuses on developing a detailed flood hazard map for the Cikapundung river basin using the HEC-RAS 2D model, which is capable of simulating rainfall, runoff, and flood inundation with high accuracy. The resulting flood hazard map provides a critical resource for local authorities, offering in-depth insights necessary for formulating and implementing targeted flood mitigation strategies. By identifying and mapping the most vulnerable areas, this research not only enhances flood preparedness and resilience in the Cikapundung river basin but also establishes a valuable framework that can be applied to other flood-prone regions. The study^s findings contribute significantly to the broader efforts aimed at reducing flood-related impacts in Indonesia.
