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Mapping flood vulnerability using an analytical hierarchy process (AHP) in the Metropolis of Mumbai

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Abstract

The burgeoning significance of urban floods in the context of evolving climate dynamics and shifting rainfall patterns underscores the exigency for comprehensive investigation and mitigation strategies. The study employs a multi-criteria assessment (MCE) approach and the analytical hierarchy process (AHP) to evaluate flood-vulnerable zones, wards, and sub-category-wise flood locations in Greater Mumbai. The AHP technique is used to evaluate flood-vulnerable impacting parameters such as rainfall (29.42%), slope (20.96%), land use/land cover (17.52%), vicinity to sewers and storm-water drainage (13.99%), vicinity to natural drainage (8.97%), vegetation (5.58%), and soil (3.56%). The study area is classified under different vulnerable categories as severe vulnerable (46.72%), high to very high (18.74%), and slight to moderate (34.54%). Researchers analysed 234 waterlogged locations, revealing that 85.46% (200 locations) were in the severe to very high vulnerability category, and only 14.52% (34 locations) were in the other three categories. Flood locations are more affected by slope (under the categories of < 5 m and 5.01–10 m), built-up land, sewers and storm water drainage (< 125 m), natural drainage (< 250 m), rainfall (< 2000 to 2200 mm), lowest dense vegetation, and coastal alluvium in soils. These model-based flood vulnerability maps are crucial for planning flood conservation and mitigation measures.

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Acknowledgements

Rohit Mann is thankful to the UGC (University Grant Commission) for financial assistance as a JRF/SRF fellowship in the Geography Department, Kurukshetra University, Kurukshetra, under NTA Ref. No.: 190510172485. Rohit Mann is thankful to Dr. Anju Gupta and Prof. Amit Dhorde for their valuable guidance and support. The authors are also grateful to Kurukshetra University for providing the infrastructure facilities. We are also grateful to the MCGM (Municipal Corporation of Greater Mumbai) authorities for providing the required data at the earliest possible time. We also consider the contributions of all those who helped us by giving their valuable suggestions.

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Rohit Mann was responsible for design of the research. Material preparation, data collection, and analysis were performed by Rohit Mann. Rohit Mann interprets the results. Rohit Mann wrote the first draft of the manuscript. Anju Gupta took lead in supervision. All authors provided comments on different versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Rohit Mann.

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Mann, R., Gupta, A. Mapping flood vulnerability using an analytical hierarchy process (AHP) in the Metropolis of Mumbai. Environ Monit Assess 195, 1534 (2023). https://doi.org/10.1007/s10661-023-12141-5

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