Placement Location Mapping for Nature-based Solutions in Flood Vulnerable Areas as a Disaster Management Alternative in Bantul Regency

Department of Environmental Geography, Faculty of Geography, Universitas Gadjah Mada

^* Corresponding author: andung.geo@ugm.ac.id

Abstract

The purpose of this study is to determine potential locations around flood-vulnerable areas for developing the concept of Nature-based Solutions (NbS) in Bantul Regency-Yogyakarta, Indonesia. The data utilized includes rainfall, slope, elevation, land use, soil type, landform, distance from the river, actual flood data, and historical flood data. This data was obtained from the Climate Hazards Group InfraRed Precipitation with Station, National Digital Elevation Model, Bantul Regional Development Planning Agency, and Bantul Regional Disaster Management Agency. The data were overlaid between the flood vulnerability maps processed using the Spatial Multi-Criteria Analysis method and Hydromorphological Landscape Unit Floodplain maps. Results of data processing and analysis for floodplain-based NbS indicate several locations for the implementation of NbS in the pilot project area, particularly at the confluence of the Opak and Oyo rivers. In the intersection of the Opak and Oyo River, various NbS types can be identified and applied. The suggested NbS includes porous pavements, riparian zones, detention basins, and inland wetlands. The placement of the four NbS is based on environmental conditions and the characteristics of each NbS object to prevent flooding.