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Franchitika, Rizky
Institut Teknologi Medan
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Journal : international journal of economics social and technology

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Flood Hazard Mapping in the Babura Sub-Watershed Using the Geomorphic Flood Index (GFI) Approach Purba, Hasanul Arifin; Franchitika, Rizky
International Journal Of Economics Social And Technology Vol. 4 No. 4 (2025): Desember 2025
Publisher : Lembaga Riset Ilmiah

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59086/ijest.v4i4.1469

Abstract

This study aims to map flood hazard areas in the Babura Sub-Watershed, Medan City, using the Geomorphic Flood Index (GFI) approach based on topographic data. The method was selected as an alternative under conditions of limited hydrological and hydraulic data by utilizing a Digital Elevation Model (DEM) and derived analyses, including flow direction and flow accumulation. The analytical process involved DEM preprocessing, geomorphological parameter calculation, and spatial classification of flood hazard levels. The results show that the GFI method successfully identified several high flood susceptibility zones, particularly around Jalan Kapiten Purba, Jalan Pintu Air IV, Kwala Bekala, J-City Housing, and parts of the Citra Wisata residential area, which correspond well with actual flood events recorded during the Medan flood in November 2025. However, discrepancies were also observed in certain downstream areas, such as the Soewondo Air Base, where the model indicated high susceptibility despite limited actual flood occurrence. These differences highlight limitations of the geomorphological approach, particularly its inability to account for hydraulic processes, infrastructure conditions, and land-use influences in detail. Despite these limitations, the GFI method proved to be a rapid and cost-efficient tool for generating preliminary flood hazard maps, making it a reliable initial approach for understanding potential flood inundation patterns and supporting flood mitigation planning and risk management.
Co-Authors Al Ikhlas Anggara, Roy Aria Mulyapradana Asri Afrilliany Surbakti Azri Suud Barus, Anggie Cuttika Pebina br BIMA BIMA, BIMA Carundyatama, Daniar Ihza Cut Nuraini Damayanti, Fera Dea Amelia Syafira Denny Meisandy Hutauruk Dirgantara, Rahmat EKA RAHAYU Fahruddin, Muhammad Fiqhri Fikri Auza’I Ikhwan Hanova, Yudha Harahap, M. Rizki Hasdiana, Hasdiana Hibnul Walid Ihza Rifyal Hd Harahap Indra Kesuma Hadi Karsim Karsim Kartika Indah Sari Kartika Indah Sari Kartika Kartika KEVIN JOSUA GINTING LUMBAN GAOL, SABAR EBEN EZER M. Hadi Sofyan Manullang, Safri Emanuel Minho, Kim Muhammad Amin Muhammad Amin Nanda Nanda Nurkhasanah Nurkhasanah Rina Puspita Nurmaidah Nurmaidah Nusa, Ahmad Bima Nuzula Elfa Rahma Oktabrian, Krisna Dwi Oktaviana Sembiring, Boni Purba, Hasanul Arifin Rahma, Nuzula Elfa RONALDO BARUS Rukhmana, Trisna Sari, Kartika Indah Silaen, Marojahan Koster Simangunsong, Boby Alexander Sipayung, Bastian Karya Cristofer Siregar, Yunita Sari Soraya Muthma Innah Nasution Sozatulo Gulo Sudarisman, Maman Surta Ria Nurliana Panjaitan Syafiatun, Syafiatun Tariq, Usman TOLHAS TRI JAWANTORO LUMBAN GAOL Wahyuni, Annisa Widodo Widodo Yahya Darmawan Yosep Heristyo Endro Baruno Yudha Hanova Yudha Hanova Yustinus Y.P Gulo Zein, Rizky Rahmadhana