URBAN FLOOD MITIGATION STUDY BASED ON 3D SPATIAL MODELING FOR DETERMINING INFRASTRUCTURE RESILIENCE PRIORITIES IN WARA DISTRICT, PALOPO CITY

Kastono (Politeknik Dewantara, Palopo, Sulawesi Selatan)
Citra Wahyu Annisa R (Politeknik Dewantara, Palopo, Sulawesi Selatan)
Alimuddin R (Universitas Andi Djemma, Palopo, Sulawesi Selatan)

Multidiciplinary Output Research for Actual and International Issue (Morfai Journal)
Vol. 6 No. 6 (2026): Multidiciplinary Output Research For Actual and International Issue

This study examines urban flood mitigation using three-dimensional (3D) spatial modeling to determine infrastructure resilience priorities in Wara District, Palopo City. The analysis integrates DEMNAS, field topographic survey data, land use, road networks, administrative boundaries, building distribution, and critical infrastructure into an integrated 3D geospatial database. Flood simulations were conducted for 25-year and 50-year return periods with a one-hour duration. The 25-year scenario used a river discharge of 377.52 m³/s, while the 50-year scenario used 566.28 m³/s. The modeling results identified 775 affected buildings, equivalent to 27.2% of 2,846 analyzed buildings, under the 25-year scenario; this increased to 845 buildings or 29.7% under the 50-year scenario. Risk patterns concentrate along the Wara River corridor and in relatively low-lying areas with high building density. Based on the integration of hazard, exposure, and vulnerability, Amasangan and Danmobilko were classified as high-priority areas, Tompotikka as medium-to-high priority, and Lagaligo as medium priority. The 3D modeling provides an intuitive visualization of the relationships among topography, river corridors, inundation, and buildings, supporting prioritization of drainage improvement, river corridor protection, infrastructure elevation, and flood preparedness measures.