Flood area mapping and flood hazard assessment in Utama Urban village, South Cimahi

Indonesia is the country with the most frequent floods, with a total of 2,029 occurrences in 2021. West Java province is included in the region with the highest incidence of flood disasters in Indonesia, with 57 flood points. Including the flood point in South Cimahi, Cimahi City is topographically a basin area with the highest population compared to the other two districts. Floods in the Utama Urban Village of South Cimahi had a more significant economic impact and were more expensive because 115 factories were operating there. Mapping of flood locations in the Utama Urban Village of South Cimahi was carried out using updated satellite imagery data through topographic measurements and river dimensions. The measurement results and secondary data are input for flood simulation using HEC-RAS software. Furthermore, the flood hazard assessment is divided into three classes, namely low, medium, and high, following the Regulation of the Head of the National Disaster Management Agency Number 2 of 2012 concerning General Guidelines for Disaster Risk Assessment. Flood Hazard Maps are based on 2D HEC-RAS modelling results for 2, 5, 10, 25, 50, and 100 years return periods. The simulation results show that the Utama Urban Village of South Cimahi is more affected by flooding in the Medium class with a flood height of 1-3m. Even though the Medium class dominates it, it still makes the Utama Urban Village one of the flood emergency villages.