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All Journal REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development
Tunas, I.G.
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Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Engineering Environmental Science Transportation

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Analisis Debit Air Limpasan Permukaan Akibar Perubahan Tata Guna Lahan Pada Daerah Aliran Sungai Bangga Andiesse, V.W.; Sutapa, I.W.; Tunas, I.G.
REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development Vol. 6 Issue 1 (March 2025)
Publisher : Civil Engineering Department, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/renstra.v6i1.700

Abstract

Surface runoff is rainwater that cannot be retained by soil, vegetation or basins and eventually flows directly into rivers or the sea. The amount of surface runoff determines the amount of damage caused by erosion and flooding. The amount of surface flow is influenced by rainfall, vegetation (land cover), the presence of water storage buildings and other factors. Damage to watersheds can cause various disasters, namely floods, droughts and landslides. The Bangga watershed has an area of 61,0561 km2 and has a river length of 20.7 km. Das Bangga has also experienced flash floods and mudflows in 2019 which caused 500 houses to be flooded and residents died after being washed away by the flood. The purpose of the study was to calculate runoff in the Bangga River watershed using the SCS-CN method. In this study the data used is secondary data, namely Rainfall data taken from the Upper Bangga and Lower Bangga stations and Land Use Maps and Soil Type Maps.  The period of secondary data used in 2018-2021. Land use and soil types are analyzed from land use maps and soil type data obtained. Map analysis was carried out using ArcGIS Software by making an overlay between the land cover map and the soil type map.  The second result of this analysis is the area of each type of land use and soil type hydrology group and its distribution in the Bangga watershed.  Based on the results of the analysis, the runoff using the SCS method obtained the maximum result in 2019 of 29,222 mm with a runoff volume of  1.784.155,751 m3, and the minimum runoff in 2018 of 0,072 mm with a runoff volume of 4.375,573085 m3. The occurrence of Land Use changes, climate change and human treatment of the environment can affect runoff.
Prediksi Kerawanan Banjir di Daerah Aliran Sungai Olaya Kabupaten Parigi Moutong Rivai, R.; Tunas, I.G.; Mardin, R.
REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development Vol. 6 Issue 2 (September 2025)
Publisher : Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/renstra.v6i2.744

Abstract

This study aims to determine the distribution of flood vulnerability levels in the Olaya Watershed located in Parigi Moutong Regency, using two previous research methods, namely the Hamdani et al. method, and the Latue & Latue method, which were then validated in the field to determine the level of validity of the two methods. The method used is data collection such as rainfall data, flood incident data, Olaya Watershed maps, DEMNAS maps, soil type maps and spot 6 satellite image maps. The analysis carried out in this study includes classifying and scoring the classification of rainfall parameters, slope gradient, land use, soil type, river buffer, elevation and Overlay is carried out by combining all input flood vulnerability parameters that have been mapped, to obtain flood vulnerability values and flood vulnerability level maps. The results of this study are the results of the analysis of flood vulnerability levels using the Hamdani et al. method, divided into Most Safe, Threatened, Vulnerable and Most Vulnerable while the Latue & Latue method is divided into Low, Medium and High. The results of these two methods are not yet in accordance with the flood events in the Olaya Watershed, this is because the weight of each parameter is not yet appropriate, there are still parameters that have not been included in the flood vulnerability modeling, the scoring of the parameter classification is not yet appropriate and the classification and scoring of the parameters are different
Co-Authors Andiesse, V.W. Mardin, R. Rivai, R. Sutapa, I.W.