Analisis Spasial Berbasis Sistem Informasi Geopasial dengan Teknik Skoring dalam Pemetaan Wilayah Rentan Banjir di Kabupaten Grobogan Provinsi Jawa Tengah

Grobogan Regency is one of the regions prone to flooding due to its geographical conditions as a lowland area, high rainfall, land-use change, and suboptimal drainage systems, which have caused significant social, economic, and environmental losses. This study aims to develop flood vulnerability mapping in Grobogan Regency through the integration of Geographic Information Systems (GIS) and scoring techniques using parameters such as topography, rainfall, land use, soil type, and river buffers to provide more comprehensive disaster mitigation recommendations. A descriptive quantitative method was employed by integrating GIS through overlay, scoring, and weighting techniques applied to parameters including topography, soil type, land cover, river buffers, and rainfall to generate a flood vulnerability map for Grobogan Regency. The results indicate that the GIS method with overlay and scoring techniques is effective in identifying flood vulnerability levels, with 31% of the study area categorized as highly vulnerable, 55% as vulnerable, and only 14% as safe, thereby serving as a basis for spatial planning and disaster mitigation in Grobogan Regency. The study highlights that flood vulnerability in the area is a result of complex interactions between topography, soil type, land use, and river infrastructure conditions, proving that GIS with overlay and scoring techniques is effective as a reference for prioritizing mitigation. Future studies should include field verification, harmonization of spatial projection systems from the outset, and stronger theoretical foundations for each parameter to produce more comprehensive and applicable mapping results in supporting flood disaster management strategies.