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All Journal G-Tech : Jurnal Teknologi Terapan
Mega Septia Sarda Dewi
Universitas Negeri Malang, Indonesia
Computer Science & IT Decision Sciences, Operations Research & Management Energy Engineering

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Land Use Dynamics and Their Impact on Surface Runoff in the Upper Brantas Watershed Clevira Regita Nathasya; Vita Ayu Kusuma Dewi; Titi Rahayuningsih; Mega Septia Sarda Dewi
G-Tech: Jurnal Teknologi Terapan Vol 9 No 3 (2025): G-Tech, Vol. 9 No. 3 July 2025
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v9i3.7474

Abstract

The Upper Brantas Watershed (DAS Brantas Hulu) in Batu City plays a vital role in the hydrological system of East Java. However, it is currently classified as critical due to extensive land use changes. Over the past five years, the increasing frequency of floods including 18 events in a single month in 2023 indicates severe environmental degradation. This study aims to analyze land use changes in 2012, 2016, 2020, and 2024; and  examine the correlation between these changes and the increase in surface runoff discharge. The methodology involves spatial analysis of land use change using ArcGIS 10.8 and calculation of surface runoff discharge using the SCS-CN hydrograph method. Curve Number (CN) values were determined based on land cover characteristics and soil types, while rainfall data were processed through frequency analysis, consistency testing, and probability distribution fitting. The results indicate a significant reduction in natural infiltration areas, such as primary forest (−3.3%) and secondary forest (−5.6%), along with an increase in impervious surfaces, including settlements (+30.9%) and industrial areas (+63.2%). These changes contributed to higher CN values and increased surface runoff, thereby elevating flood risks in the Upper Brantas Watershed. The findings emphasize the urgent need to control land conversion as part of sustainable spatial planning and disaster mitigation strategies.
Stormwater Runoff Control Analysis Using Rain Garden Implementation in the Drainage System of GKB, Universitas Negeri Malang Camila Aysha Putri Bachtiar; Vita Ayu Kusuma Dewi; Titi Rahayuningsih; Mega Septia Sarda Dewi
G-Tech: Jurnal Teknologi Terapan Vol 9 No 4 (2025): G-Tech, Vol. 9 No. 4 October 2025
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v9i4.8062

Abstract

Climate change and rapid urbanization have intensified stormwater runoff in urban areas, including Malang City, while conventional drainage systems often lack the capacity to manage excess flow. This study aims to design and evaluate a rain garden model as a sustainable green infrastructure for reducing stormwater runoff in the GKB area of Universitas Negeri Malang, which frequently experiences inundation of up to 20 cm. The methodology involved rainfall analysis, probability distribution testing, and peak discharge estimation to determine the design parameters. The rain garden’s performance was assessed by comparing its storage capacity with the calculated runoff volume. Results indicate that for a two-year return period (0.134 m³/s), the proposed rain garden can fully accommodate runoff within its designed capacity. These findings demonstrate the potential of rain gardens as an effective nature-based solution to improve drainage efficiency and enhance urban flood resilience.
Co-Authors Camila Aysha Putri Bachtiar Clevira Regita Nathasya Titi Rahayuningsih Vita Ayu Kusuma Dewi