Flood modelling at Bandar Batu Pahat, Johor using HEC-RAS software

Abstract Flood catastrophe continuously hit Malaysia through monsoonal flood and flash as well posing threat towards people, infrastructure environment. Batu Pahat is among the district in Johor affected by disaster for almost every year. This study conducted to determine hydraulic hydrological characteristic ability of drainage system Parit Besar Jalan Pontian-Batu catchment area at using HEC-RAS software. Through HEC-RAS, floodplain map was also produced access overview potential areas. Survey data, geometric data flow were computed produce cross-sectional along area. Four (4) rates 0.05284, 0.05894, 0.06910 0.07113 (m 3 /s) utilized identify accommodate additional water. Several stations cannot runoff with minimum rate 0.05284 /s). Meanwhile, due has low elevation insufficient system. From results, areas identified. Modification cross-section proposed reduce vital better understanding flooding help authorities management plan.