Hydrological Analysis of Flood Control Systems Using HEC-HMS in the LOA Janan Watershed
DOI:
https://doi.org/10.59890/zaras872Keywords:
Flood Control, LOA Janan Watershed, Hydrological Modeling, HEC-HMSAbstract
This research aims to analyze design rainfall and design a flood control system in the Loa Janan watershed using the Log Pearson Type III distribution method and hydrological modeling with the HEC-HMS program. The Log Pearson Type III distribution was chosen because it is able to handle extreme hydrological data with high accuracy, which is important in determining design rainfall at various return periods (such as Q2, Q5, Q10, up to Q1000). This design rainfall data is then used in HEC-HMS simulations to model maximum discharge and water flow patterns in different flood scenarios. The simulation results show that this modeling provides a realistic picture of maximum discharge, so that the capacity of flood control infrastructure can be planned more precisely. In addition, this research evaluates the effectiveness of several flood control structures, including cutouts, river normalization, and retention ponds, in reducing peak discharge and flood risk in the downstream area of the Loa Janan watershed. The combination of these structures has proven effective in diverting, containing and controlling excess water flow, thereby providing better protection for flood-prone areas. Overall, this modeling-based approach offers a scalable solution to support flood control planning in the Loa Janan watershed
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