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Daud, Darwizal
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Civil Engineering, Building, Construction & Architecture Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology

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Pemodelan Luas Genangan Banjir Batang Lunto di Wilayah Kota Sawahlunto Indra, Bambang Adi; Daud, Darwizal; Andriani, Andriani; Azra, Dio Syahlung
Jurnal Talenta Sipil Vol 8, No 1 (2025): Februari
Publisher : Universitas Batanghari Jambi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33087/talentasipil.v8i1.848

Abstract

Batang Lunto originates in Barangin District, Sawahlunto City, West Sumatra Province and flows eastwards, dividing Sawahlunto City in Lembah Segar District and empties into Batang Ombilin. The Batang Lunto River is included in the Ombilin Coal Mining Heritage Area of Sawahlunto and has been designated as a world cultural heritage by the United Nations Educational, Scientific and Cultural Organization (UNESCO). During the rainy season along the Batang Lunto river, flooding often occurs, while along the Batang Lunto river there are heritage and geopark assets which are tourism destinations in Sawahlunto City. This research aims to model the area of the Batang Lunto flood inundation in the Sawahlunto City area as a first step in mitigating the risk of flood disasters with an area under review of 125.70 Ha. Modeling was carried out using a hydrological and hydrodynamic approach using rainfall data, topography and river flow characteristics. This research utilizes simulation software to map flood-affected areas with various flow discharge scenarios. Flood inundation simulations were carried out using ArcGIS 10.3, HEC-Ras 6.3.1 software at return periods of 2, 5, 10, 25, 50, 100 years. The results of this research show that the flood inundation area resulting from the HEC RAS simulation at the 2-year return period with a discharge of 102.61 m3/s is 18.12 Ha or around 14.42% of the total area of the survey area in this study and respectively for return periods 5, 10, 25, 50, 100 annual is 20.43 Ha (16.25%), 38.38 Ha (30.53%), 45.84 Ha (36.48%), 55.56 Ha (44.20%), 63.70 Ha (50.68%).
Simulasi Luas Genangan Banjir Batang Sinamar Nagari Taram Kab. Lima Puluh Kota Taufik, Arrahmat; Daud, Darwizal; Andriani, Andriani
Jurnal Talenta Sipil Vol 8, No 2 (2025): Agustus
Publisher : Universitas Batanghari Jambi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33087/talentasipil.v8i2.953

Abstract

Batang Sinamar is located in Lima Puluh Kota Regency, West Sumatra Province, and flows through Riau Province before emptying into the Strait of Malacca. Flooding can cause loss of life and property. In the Nagari Taram area, floods occur almost every year with an average inundation depth of 1–2 meters. However, no research has been conducted on flood control and early warning systems. Meanwhile, the economic losses experienced by the community are significant. Therefore, it is necessary to conduct simulations of flood inundation depth and flood-prone areas as an initial study for flood control planning. The simulation uses HEC-RAS 6.4.1 software, QGIS, and the DEMNAS base map from BIG. Hydrological analysis is performed using the Nakayasu and Snyder Synthetic Unit Hydrographs with flood return periods of 2, 5, 10, and 25 years. The simulation results show that the flood inundation area increases with higher return periods. For the flood event in 2019, the discharge was equivalent to a 5-year return period flood, which was 982.18 m³/s, with an inundation area of 293.51 hectares. Hazard zones (marked in red) are predominantly found along the riverbanks, with an average distance of around 100 meters from the river's edge. The study concludes that the areas along the riverbanks are unsuitable for residential settlements, schools, and agricultural activities due to inundation depths of ≥3.0 meters.
Co-Authors Andriani Andriani Azra, Dio Syahlung Indra, Bambang Adi Taufik, Arrahmat