Flood Hazard and Risk Assessment Due to Land Use Changes in Purbalingga, Indonesia

Abstract

Purbalingga Regency is one of the regencies in Central Java Province that has rapid growing in economic and tourism in accordance with comprehensive urban planning. Land use changes is an important aspect of urban planning. Therefore, spatial analysis is needed to highlight the problem of flooding in Purbalingga Regency. Spatial analysis performed for flood risk is a spatial analysis based on flood hazard zoning and flood vulnerability. Flood hazard zoning and flood vulnerability analysis were conducted using Analytical Hierarchy Process (AHP) and Geographic Information System (GIS) for existing condition, regarding current data and projection condition presented in Purbalingga Urban Planning 2011-2031. Result of flood hazard zoning analysis showed that for existing condition, Purbalingga Regency is mostly considered into the medium category of hazard category with an area of 62,652.077 ha. On the other hand, referring urban planning projection data 2031, there is a decrease in categories of low, medium, and high, but increase in very high and extreme category. Risk assessment shows that Purbalingga Regency currently has an extreme category with an area of 11,080.047 ha, including the proposed location of Wirasaba Airport.