Flood Vulnerability Mapping to Riverine Floods: A Study on the Old Brahmaputra River

Abstract

Flood is an inevitable natural phenomenon occurring from time to time in all rivers and natural drainage systems of Bangladesh. It causes damage to lives and natural resources as well as the loss of economy and health. This study illustrates the flood vulnerability mapping to riverine floods in the Old Brahmaputra River in Mymensingh Sadar upazila. The flood vulnerability mapping of fourteen unions of Mymensingh Sadar is made by using satellite images, a structured questionnaire, observation and secondary data. Flood vulnerability mapping is a necessary pre-requisite for comprehensive flood mitigation programs. This study emphasizes the importance and needs of looking the phenomena of floods and floods vulnerable area at the national scale in order to fully understand and completely deal with the problem. Totally flood vulnerable unions are Borar Char, Paranganj, Sirta, Char Ishwardi and Char Nilakshmia and flood vulnerable free unions are Ghagra, Dapunia and Akua. With these flood vulnerability mapping, the legal authority can take necessary steps to reduce the flood risk.

Flood Hazard, Vulnerability and Risk Assessment for Different Land Use Classes Using a Flow Model

“…The study shows the uses of one-dimensional hydraulic model for hazard assessment and analysis of land use for vulnerability assessment and finally finds out flood risk from hazard and vulnerability. Rakib et al (2017) and very recently Hoque et al (2019) introduce a new dimension in vulnerability assessment, and this dimension makes the vulnerability assessment become more community focused than before. Their methods include analysing satellite images, a structured questionnaire, criteria mapping, observation and secondary data.…”

Integrated assessment of flood risk in Arial Khan floodplain of Bangladesh under changing climate and socioeconomic conditions

“…Although both multiplicative and additive formulations are used in vulnerability assessment, the use of multiplicative formulation is almost universal in risk assessment (Rahman, 2006; Smith, 2004; United Nations, 1991). This multiplicative approach of integrated flood risk assessment was also adopted in many studies (e.g., Allen et al, 2016; Rakib et al, 2017) as it aggregates items of different scales and units. It was also suggested to use the multiplicative equation for the flood risk assessment due to CC, as it allows lesser compensation for low value indicators, whereas the additive approach provides a constant trade‐off among the components (Choi, 2019).…”