Analisis Spasial Risiko Banjir Bandang Akibat Keruntuhan Bendungan Alami pada DAS Krueng Teungku, Kabupaten Aceh Besar, Provinsi Aceh

Abstract

This research presents the results of spatial analysis of flash flood disaster risk due to the collapse of natural dam at the watershed Krueng Teungku, Seulimeum sub-district, Aceh Besar Regency, Aceh Province. The vulnerability parameter is a combination of components of social vulnerability and physical vulnerability. Furthermore, based on the parameters of these hazard and vulnerabilities, risk analysis was done through the determination of flash flood risk classification for downstream area of the dam. In general, the risk area covered 32.02 hectares based on the formation of 15 grids (100 meters horizontal x 100 meters parallel river cliff). Based on risk level classification of the natural downstream of Krueng Teungku, there were 5 areas included in the High Risk Level, 8 areas in Medium Risk areas, and 2 areas in Risk Level Light. The medium level was the most dominant category which covers 23.33 hectares or 72.85% of the total area. The high risk areas comprises of 6.29 hectares or 19.64% of total area area followed by low risk class covering an area of 2.41 hectares or 7.51% of total area. The classification of flash flood disaster risk level is useful to improve community preparedness in downstream of a natural dam to minimize the risk of flash flood disaster which is a recurrent disaster in Beureunut Village