Flood hazard risk matrix for urbanization control area of flood plain

Abstract

Identification and understanding the potential flood risk area are important elements in disaster risk reduction through development planning control plan. The development growth in Merlimau area causes demand for new urbanization area for residential, commercial and public infrastructure. Therefore, the risk of flood should evaluate to identify the possible future flood hazard-risk area based on future land use in Merlimau. This paper describes an approach to produce flood hazard and risk matrix and map using a combination of flood numerical modelling and Geographical Information System (GIS) analysis in Merlimau River Basin. The result from this study is a flood hazard risk map that provides information on flood risk level in Merlimau basin, which further can contribute to future development planning. This matrix and map identified as the risk areas that suggested being an Urbanization Control Area (UCA) to control future development. Six locations identified as the UCA that involved about 26.27 hectares. The analysis also shows almost 80% or 21.03 hectares of UCA already been planned for residential area and about 18% or 4.78 hectares for industrial area. There are only about 2% or 0.46 hectare of UCA remain in the future development plan.