Flood vulnerability and flood-prone area map at Medan City, Indonesia

Medan is the third largest city in Indonesia. It is a lowland with topography tend to ramps and as an encounter place of two rivers namely Deli River and Babura River. Medan city is prone to flood because it is a downstream area traversed by those two rivers. According to the Regional Disaster Management Agency, the most frequent disaster in Medan City is a flood, which occurred almost every year over the last 10 years. Climate change has caused increasing frequency and intensity of rainfall in North Sumatra in recent years. It triggers the occurrence of floods. The purpose of this study was to determine the area which is vulnerable and prone to flood. The objectives are making a map of flood prone area and flood vulnerability map. The research is descriptive, which used Geographical Information System (GIS) analysis. GIS is used to produce disaster-prone maps by sequencing data such as slope, land use and landform. From the research above, it found that Medan City is generally a flood-prone area and has a high vulnerability for flooding. Medium and high flood-prone areas reach 95% of the entire area of Medan City. Meanwhile vulnerable areas are low and medium reaching 98%.