DOI: https://doi.org/10.14710/teknik.v46i4.77258

Dam-Break Flood Modeling and Risk Assessment using HEC-RAS 2D: for Ladongi Dam, Southeast Sulawesi, Indonesia

*Aji Prakoso Nimanto  -  Water Resources Management, Faculty of Civil and Environmental Engineering, Bandung Institute of Technology Jl. Ganesa No. 10. Coblong, Bandung City, West Java, 40132, Indonesia
Ardy Satriya  -  Water Resources Management, Faculty of Civil and Environmental Engineering, Bandung Institute of Technology Jl. Ganesa No. 10. Coblong, Bandung City, West Java, 40132, Indonesia
Nasywa Hanin Hanifah  -  Water Resources Management, Faculty of Civil and Environmental Engineering, Bandung Institute of Technology Jl. Ganesa No. 10. Coblong, Bandung City, West Java, 40132, Indonesia
Arno Adi Kuntoro  -  Water Resources Management, Faculty of Civil and Environmental Engineering, Bandung Institute of Technology Jl. Ganesa No. 10. Coblong, Bandung City, West Java, 40132, Indonesia
Mohammed As Algoul  -  Ain Al-Qarar Company, Al-Ni’mah Tower, Al-Rimal District, Gaza City, Gaza Strip, Palestine P900, Palestinian Territory, Occupied
Open Access Copyright (c) 2025 TEKNIK

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Abstract

Dam-break floods pose severe threats to human safety, infrastructure, and economies, especially in embankment dams. The Ladongi Dam, located in East Kolaka Regency, Southeast Sulawesi, Indonesia, is classified as a high-hazard structure, making its potential failure a significant concern. This study aims to assess dam-break flood hazards and risks using HEC-HMS to simulate rainfall, runoff and dam-break hydrographs, and HEC-RAS 2D to model downstream flood propagation and inundation characteristics. The results show that under the Probable Maximum Precipitation (PMP = 550,7 mm), the dam and spillway can safely manage the PMF without overtopping. Under a piping failure scenario, simulations indicate an inundated area of 76,7 km² across three sub-districts, with a peak flow velocity of 23,48 m/s, a water depth exceeding 10 m, and a flood duration of more than 24 hours. Risk assessment integrating hazard, vulnerability, and capacity indices shows the highest risk level in Ladongi Sub-district (0,67), while Dangia (0,57) and Loea (0,62) are classified as medium risk. These results highlight that non-structural mitigation measures such as early warning systems, evacuation planning, and community preparedness can enhance community capacity and contribute to reducing the overall flood risk index in the affected region.

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Keywords: Dam-break, 2D Hydraulic Modeling, Risk Assessment, HECS, HEC-RAS, Ladongi DAM

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Language : EN
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