Pemetaan Kerawanan Banjir di Daerah Aliran Sungai (DAS Belawan Berbasis Sistem Informasi Geografis

Abstract

Indonesia's climate dynamics are having negative effects for human, such flooding. The Belawan Watershed, which is a part of one of the watersheds whose carrying capacity needs to be restored, because frequently flooding as natural disasters. The purpose of this study is to identify the spatial distribution of flood vulnerability in the Belawan watershed by using a geographic information system. In this research, Flood vulnerability areas were identified using scoring and weighting methods. The flood parameters consist of slope, land height (elevation), rainfall intensity, soil type, river range (distance from river), and land cover. The results show us that the Belawan watershed is divided into five classes of flood vulnerability. The results of the analysis show that the Belawan Watershed has a moderately vulnerable class of 46,796.85 ha, a vulnerable class 12,602.01 ha, a less vulnerable class 9,054.23 ha, a very vulnerable class 2,651.71 ha, and a non-hazardous class 2,068.50 ha of the total area in Belawan watershed that is 73,173.30 ha.