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All Journal Journal of Applied Geospatial Information
Entin Hidayah
Department of Civil Engineering, Faculty of Engineering, Universitas Jember, 68121 Jember, Indonesia
Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Engineering Environmental Science Physics

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Spatial Assessment of Flash Flood Susceptibility in a Steep Tropical Watershed: The Banyuputih Case Study, Indonesia Gandhi Teguh Lesmana; Entin Hidayah; Retno Utami Agung Wiyono; Fidyasari Kusuma Putri; Hilma Wasilah Robbani; Jagat Adi Samudra
Journal of Applied Geospatial Information Vol. 10 No. 1 (2026): Journal of Applied Geospatial Information (JAGI)
Publisher : Politeknik Negeri Batam

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Flash flood susceptibility in upstream watersheds is influenced not only by rainfall intensity but also by the spatial configuration of physiographic characteristics and land use. The Banyuputih Watershed in East Java has experienced recurrent flash floods, emphasizing the need for spatial assessment to support effective mitigation planning. This study develops a flash flood susceptibility map using a GIS-based multi-criteria approach integrated with logistic regression. The analyzed factors include DEM-derived topographic parameters (elevation, slope, Topographic Position Index (TPI), Topographic Wetness Index (TWI), and plan curvature), Hydrologic Soil Group (HSG), rainfall, river density, land cover, and NDVI. The relative influence of each factor was determined from logistic regression coefficients. The results classify the watershed into five susceptibility levels: very low, low, moderate, high, and very high. High to very high susceptibility zones are spatially limited and mainly concentrated in upstream and parts of midstream areas characterized by flow-convergent topography and less protective land cover. Most of the watershed is dominated by very low to moderate vulnerability, indicating that flash flood potential is spatially localized. The resulting map provides a scientific basis for watershed management, land-use planning, and targeted nature-based mitigation strategies.
Performance Assessment of the Semajid River Watershed and Improvement Strategy Through Land Cover Optimization Mohammad Afif Hasan; Entin Hidayah; Indra Nurtjahjaningtyas; Mokhammad Farid Ma’ruf
Journal of Applied Geospatial Information Vol. 10 No. 1 (2026): Journal of Applied Geospatial Information (JAGI)
Publisher : Politeknik Negeri Batam

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The Semajid River Basin (DAS) faces complex environmental problems, including flooding during the rainy season, drought during the dry season, increased river sedimentation, and uncontrolled land use changes. This study aims to assess the performance of the Semajid Watershed in accordance with the Minister of Forestry Regulation Number 61 of 2014 on Monitoring and Evaluation of Watershed Performance, and to formulate strategies to improve watershed performance through land-cover optimization scenarios. The watershed performance assessment includes criteria for land, water management, socio-economics, building investment value, and space utilization. The evaluation results show that the Semajid Watershed performance value is 113.75, which indicates that the watershed is in the category of needing to be saved. The application of the additional land cover scenario has a significant impact on improving the criteria for vegetation cover and protected areas. The Percentage of Permanent Vegetation Cover (PPV) increased from 5.5% (very high recovery category) to 32.44% (low recovery category), while the value of the protected area criteria decreased from 68.64 to 9.37, indicating an improvement in the ecological condition of the watershed. Although the watershed's carrying capacity increased to 107.5, the Semajid watershed remains in need of restoration. Therefore, restoration of the Semajid watershed requires integrated management that sustainably integrates technical and non-technical efforts.
Co-Authors Fidyasari Kusuma Putri Gandhi Teguh Lesmana Hilma Wasilah Robbani Indra Nurtjahjaningtyas Jagat Adi Samudra Mohammad Afif Hasan Mokhammad Farid Ma'ruf Retno Utami Agung Wiyono