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Flood Susceptible Analysis and Inundation Risk Mapping for a Regulated River, Case Study: Sg. Tajar

Author(s): Eny Suria A. Jalil; Shanker Kumar Sinnakaudan; Mukhlis Zainol Abidin

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Keywords: Flood analysis; Flood risk mapping; Regulated river; Sungai Tajar

Abstract: Flood is a natural disaster that is frequently affecting our country. Flood happen because of overspill excess river flow, sudden storm flow, bund break, dam damage and others. Furthermore, illegal flood plain encroachment further worsens the existing problem. Therefore, prediction and pre-control of flood must be determined. To visualize this, hydrologic and hydraulic modelling software like HEC-HMS and HEC-RAS are used. This software enables predictions of changes in water level. Based on this, the flood mitigation measures can be identified. The study area that this research covers is Sungai Tajar. It flooded frequently as it has a gentle slope river and low bund along the river. Sungai Tajar has a total length of 6.5 km and has a catchment area of 8.5 km2. Along the river has paddy field that are much likely to be in a very low-lying condition prone to inundated and damaging the farmers crops. Hence current research predicts its future and current flood level based on data collected from site observations. The predicted flood level later transformed into flood inundation maps which clearly indicates the flood risk zones. By doing this research, cultivating paddy can be planned accordingly and lessen the impact of flood in the Sungai Tajar catchment.

DOI:

Year: 2020

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