Analisis Potensi Rawan Longsor Untuk Menentukan Jalur Evakuasi di Kecamatan Dolat Rayat Kabupaten Karo Menggunakan GIS

Abstract

The observation location in this study was Dolat Rayat District, Karo Regency. Dolat Rayat District is one of the Districts in Karo Regency that has a fairly high frequency of landslides, namely 5 incidents in the last 5 years from 2019-2024. The purpose of this study was to map landslide-prone areas in Dolat Rayat District, and analyze evacuation points in residential areas prone to landslides. The stages in this study began with literature studies and field surveys, secondary data collection, then data processing using ArcGIS and finally primary data collection in the form of evacuation points and routes for landslide-prone settlements. Based on the results of the overlay and scoring, it was obtained that the landslide vulnerability was moderate and high with an area of 1,625 Ha (71.1%) and 375 Ha (16.4%) respectively. While for the very high category it has an area of 4 Ha (0.2%) and for the low category it is very minimal, namely 281 Ha (12.3%). Based on the mapping and analysis, it was found that there are 3 (three) villages in Dolat Rayat District whose settlements are located near high landslide-prone areas, namely Dolat Rayat Village, Sugihen Village, and Bukit Village. Based on the mapping and analysis, evacuation points and routes were then determined. Evacuation points were determined in open areas with relatively low vulnerability, and evacuation routes were determined based on the closest distance and road conditions from landslide-prone settlements to evacuation points.