Pengaruh Perubahan Tata Guna Lahan Terhadap Limpasan Permukaan Dan Erosi Lahan Daerah Aliran Sungai (DAS) Bendungan Temef Dengan Soil And Water Assessment Tool (SWAT+): The Impact Of Land Use Change On Surface Runoff And Soil Erosion In The Temef Dam Watershed Using The Soil And Water Assessment Tool (SWAT)

Arnoldus Nama (Politeknik Negeri Kupang)
Yunus Fallo (Politeknik Negeri Kupang)
Fabianus J. S. Nope (Politeknik Negeri Kupang)

Media Ilmiah Teknik Sipil
Vol. 14 No. 2 (2026): Media Ilmiah Teknik Sipil

Land-use change is one of the primary drivers influencing watershed hydrological conditions. Uncontrolled conversion of land in the Benanain watershed, particularly in the Temef sub-watershed, has the potential to increase surface runoff and accelerate soil erosion, which in turn increases sedimentation within the Temef Dam reservoir. This study aims to analyze the impact of land-use changes between 2018 and 2024 on surface runoff and soil erosion using the Soil and Water Assessment Tool Plus (SWAT+). Data used include rainfall, climate, DEM, soil type maps, and land cover maps which were processed through watershed delineation, HRU formation, and hydrological simulations. The results indicate significant land-cover changes, particularly a reduction of shrubland by 27.65% and an increase in forest area by 23.74%. These changes significantly affect runoff patterns, where in 2024 sub-watershed 6 produced the highest annual runoff of 611.96 mm and sub-watershed 8 the lowest at 209.93 mm. The findings provide a comprehensive understanding of hydrological dynamics in the Temef watershed and serve as a scientific reference for soil-water conservation planning and sustainable watershed management.