Geology and flood hazard analysis in Kuala Krai, Kelantan

Over the years, floods have emerged as one of world's most devastating events. Kelantan is one of the impacted states in Malaysia where the Northeast Monsoon produce flooding in several district from October to March as a result of severe rainfall. The research was conducted at Sungai Sok, Kuala Krai, Kelantan and the study area covers about 25km² which aligned along latitude 5°23'30.00"N to 5°20'48.00"N and longitude 102°16'00"E to 102°18'48.00"E. The objectives of the research are to produce the geological map of Sungai Sok, Kuala Krai, Kelantan with scale 1:25000 and to generate flood hazard map using different parameter. Due to the limited information about the geological features, geological mapping has been conducted and structural data such as strike and dip, lithology, joint and the other geological features were collected. Flood hazard map was constructed by collecting and evaluating data on all flood-related factor, such as flow length (rainfall and water level), elevation, slope, land use and river distance. The parameter that triggered floods in Sungai Sok area were analysed. In order to achieve objectives, Weighted Overlay Method (WOM) and Geographic Information System (GIS) were used as tools. From the weighted technique tools, the data were processed in ArcGIS software which enables the production of a flood hazard map by superimposing one map image over another as well as displays low, medium, and high-level flood zonation map. The results show the potential flood area in near future were determined accurately and this research can give essential information containing strategy development and planning adaptation which can be provided by a reasonable flood risk analysis.