Flood Mapping using HEC-RAS and GIS: A Case Study of Palembang Watersheds

Authors

  • Febrinasti Alia Department of Civil Engineering, Faculty of Engineering, Sriwijaya University, Indralaya Campus, Ogan Ilir Regency, South Sumatra 30862, Indonesia
  • Muhammad Rendana Department of Chemical Engineering, Faculty of Engineering, Sriwijaya University, Indralaya Campus, Ogan Ilir Regency, South Sumatra 30862, Indonesia
  • Wan Mohd Razi Idris Department of Earth Sciences and Environmental, Faculty of Science and Technology, University Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia
  • Sarino Sarino Department of Civil Engineering, Faculty of Engineering, Sriwijaya University, Indralaya Campus, Ogan Ilir Regency, South Sumatra 30862, Indonesia
  • Agus Lestari Yuono Department of Civil Engineering, Faculty of Engineering, Sriwijaya University, Indralaya Campus, Ogan Ilir Regency, South Sumatra 30862, Indonesia

DOI:

https://doi.org/10.37934/araset.63.1.244256

Keywords:

Urban flood, steady flow, spatial analysis, flood mapping

Abstract

Flooding is a significant issue in Palembang City, affecting areas such as Gandus, Lambidaro, Boang, Sekanak, Bendung, Kidul, Buah, Juaro, Selinca, Nyiur, Aur, Sriguna, Kedukan, Keramasan, Kertapati and Jakabaring watershed. This research contributes to flood control measures by providing flood mapping and modelling for decision-makers and local authorities. The main objective of this paper is to perform a steady flow analysis to study the hydraulic characteristics of flow; velocity and water surface profile of the adjacent research areas. There are three processes involved in the data analysis: hydrological, hydraulic and spatial. The calculation of average rainfall is performed using the Isohyet method with the assistance of the IDW 3D Analyst tool in ArcGIS and the design discharge is calculated using the HSS Nakayasu method. The hydraulic analyses involve river morphology extraction using RAS Mapper tools in HEC-RAS. Steady flow simulations are conducted for normal water depth conditions and the highest tidal conditions. The simulation result is then reclassified and the flood location points are verified with observed data. For normal water depth conditions, the maximum water level in the Lambidaro watershed reaches 2,09 meters, which covers a flood area of 721,53 ha. Meanwhile, based on the highest tidal simulations, the maximum water level in the Selinca watershed reaches 3,21 meters, covering a flood area of 209,36 ha.

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Author Biographies

Febrinasti Alia, Department of Civil Engineering, Faculty of Engineering, Sriwijaya University, Indralaya Campus, Ogan Ilir Regency, South Sumatra 30862, Indonesia

febrinastialia@ft.unsri.ac.id

Muhammad Rendana, Department of Chemical Engineering, Faculty of Engineering, Sriwijaya University, Indralaya Campus, Ogan Ilir Regency, South Sumatra 30862, Indonesia

muhdrendana@ft.unsri.ac.id

Wan Mohd Razi Idris, Department of Earth Sciences and Environmental, Faculty of Science and Technology, University Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia

razi@ukm.edu.my

Sarino Sarino, Department of Civil Engineering, Faculty of Engineering, Sriwijaya University, Indralaya Campus, Ogan Ilir Regency, South Sumatra 30862, Indonesia

sarino@ft.unsri.ac.id

Agus Lestari Yuono, Department of Civil Engineering, Faculty of Engineering, Sriwijaya University, Indralaya Campus, Ogan Ilir Regency, South Sumatra 30862, Indonesia

aguslestariyuono@ft.unsri.ac.id

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Published

2024-11-04

Issue

Online First Articles

Section

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