Flood vulnerability impact for food estate potential in Central Kalimantan, Indonesia

Abstract

Provision of agricultural land to support food security has criteria including optimal crop productivity, adequate intensity, guaranteed water availability (surface water and groundwater) and environmental conditions that are secured to damage (conservation). Food estate in Central Kalimantan will be allocated 30,000 ha or 300 km2 in 2020. Since the land allocation for food estate are existed near main rivers, environmental aspect from hydrological issue becomes one major aspect that must be considered. This study assesses potential rice field by using GIS and two dimensional unsteady hydrological model simulation due to flood prone area. Based on this model, vulnerable area could be measured by quantitative method in order to prevent losses act. The results show where composition of existing land use in upstream of each watershed (Barito, Kahayan, Kapuas River Basin) give different maximum peak discharge based on hydrograph curve of each zone of food estate area targeted. Food estate of 30,000 ha overall has less index of vulnerability of flood hazard, where 9% of its total area inundated by Q50 years return period discharge.