Flood Mapping Analysis for the Downstream Urban Area of the Keureuto Sub-Catchment with River Interventions

Abstract:

The Matangkuli Sub-district’s urban area situated along the Keureuto river’s downstream are topographically a flood plain area. Flood hazard has affected the area at yearly basis. The Keureuto dam, located at the upper stream of the area, is intended for flood control of the 50 years return period flood (Q_T50). The dam is plan to be operated in year 2025. The impact toward the downstream area should the flood event exceed the controlled flood has yet been investigated. This study is aiming at analyzing flood maps at the downstream of the dam for three scenarios: 1. Mapping the flood events of three selected years, 2016, 2017 and 2022; 2. Mapping the impact of the Q_T50 and Q_T100 considering the flood control of the dam; 3. Mapping the Q_T100 with river interventions. Two stages of analysis are hydrologic analysis and hydraulic simulation. The Peak Over a Threshold (POT) is selected for the design discharge analysis. Discharge data are converted based on water level data from the Automatic Water Level Recorder (AWLR) Station at the sub-catchment outlet. The HEC-RAS and RAS-Mapper is applied for the water profile and flood mapping. Simulating the three flood events confirming the reported inundated area. Considering the flood control of the dam confirming that no flood occurs at the downstream for the Q_T50. The river interventions of floodwall at the downstream for the Q_T100 has reduced 27.6 % of the inundation area.

• Periodical: Construction Technologies and Architecture (Volume 18)
• Pages: 99-106
• DOI: https://doi.org/10.4028/p-dGjI5k
• Online since: June 2025
• Authors: Renaldi Renaldi, Shifa Nabila, Fadhliani Umar*, Khairullah Yusuf, Adzuha Desmi, Fasdarsyah Fasdarsyah, Teuku Mudi Hafli
• Keywords: Flood Mapping, HEC-RAS, Keureuto, RAS-Mapper, River Interventions

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