![]() ![]() The flood hazard problem in recent times is getting more and more frequent and acute due to growing population size and human interventions/socio-economic activities in the floodplain at an ever-increasing scale (Bhuiyan and Baky 2014 Paul and Routray 2010).įlood mitigation approaches in Bangladesh have ranged from structural interventions (embankment, flow regulation structures, etc.) to non-structural approaches (forecasting and warning, flood preparedness before during and after the flood, flood proofing measures, etc.) (Paul and Routray 2010 Rahman and Salehin 2013). These floods cause physical damages to agricultural crops, buildings and other infrastructure, social disruptions in vulnerable groups, livelihoods and local institutions, and direct and indirect economic losses (Baky et al. About one-fifth to one-third of the country is annually flooded by overflowing rivers during pre-monsoon (April to May) and monsoon (June to September) periods. This unique geographical setting, surrounded by mountains on three sides, together with extremely flat and low-lying floodplain topography, a low-lying coastline, and an extreme climate variability has rendered the country highly prone to natural hazards such as flood (Chowdhury et al. This research selected Bangladesh for the purpose of assessing flood risk.īangladesh is a deltaic country located at the lower part of the basins of the three mighty rivers-the Ganges, the Brahmaputra and the Meghna. Bangladesh is one of those countries where a significant number of studies have been carried out with flood issue. There are many examples of flood studies in different countries. This study is concerned with how we can assess flood risk in a given flood prone area. The approach for flood risk assessment adopted in this study successfully addresses the critical point in flood risk study, where flood risk can be varied even after there is no change in flood hazard intensity. However, inundated areas with different levels of flood depth always increase with the increase in return period of flood. Applying this approach, the study finds that areas with different levels of flood risk do not always increase with the increase in return period of flood. Then, finally flood risk was assessed first by combining replacement values assessed for the elements and then using the depth–damage function. ![]() For the purpose of flood vulnerability assessment, elements at risk and flood damage functions were identified and assessed, respectively. Two-dimensional flood flow simulation was performed with Delft3D model to compute floodplain inundation depths for hazard assessment. The flood risk was assessed from flood hazard and vulnerability indices. This study aims to introducing a new approach of assessing flood risk, which successfully addresses this above-mentioned critical issue. Clearly, risk is a function of hazard and vulnerability. A critical point in flood risk assessment is that while flood hazard is the same for a given area in terms of intensity, the risk could be different depending on a set of conditions (flood vulnerability). This study is concerned with flood risk that can be assessed by integrating GIS, hydraulic modelling and required field information.
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