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Flood vulnerability assessment of urban micro-watersheds using multi-criteria decision making and InVEST model: a case of Hyderabad City, India

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Abstract

Urban areas are increasingly getting vulnerable to floods due to high-intensity precipitation and increasing concretization. To identify the flood vulnerability status of urban micro-watersheds for an improved mitigation strategy, we propose a Flood Vulnerability Index (FVI) with readily available urban infrastructure and hydrological data. The criteria variables for FVI calculation include urban infrastructure data (building and road density), run-off retention capacity, the fraction of vegetation cover, and open spaces. The Soil Conservation Service Curve Number (SCS-CN) method has been applied to estimate run-off retention using the Integrated Valuation of Ecosystem Services and Trade-offs (InVEST) model. The weighted linear combination of the criteria variables was used to derive the FVI of each micro-watershed. The Analytical Hierarchical Process (AHP) has been utilized for the weight assignment. This method is applied to the Hyderabad City area, India. The city is densely populated and often devastated by urban floods. Results indicate that out of 85 micro-watersheds classified in the region, 24 are highly vulnerable with FVI > 3, requiring immediate flood mitigation action. A near-future flood mitigation strategy is required for 36 micro-watersheds with FVI in the range of 2–3. The remaining 25 micro-watersheds are relatively less vulnerable with FVI < 2. The proposed FVI accounts for the watershed's hydrological behavior, which is highly relevant in flood vulnerability estimation. The developed method is extremely simple to adapt to any city for flood vulnerability estimation and policy planning based on easily available open data.

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Abbreviations

AHP:

Analytical hierarchical process

DEM:

Digital elevation model

FVI:

Flood Vulnerability Index

HSG:

Hydrologic Soil Group

InVEST:

Integrated valuation of ecosystem services and trade-offs

IPCC:

Intergovernmental panel on climate change

LULC:

Land use land cover

MCDM:

Multi-criteria decision making

QGIS:

Quantum Geographic Information System

RS-GIS:

Remote Sensing and Geographic Information System

SCS-CN:

Soil conservation service-curve number

UGS:

Urban green spaces

WLC:

Weighted linear combination

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Acknowledgements

The authors sincerely thank the support extended by the Commissioner of Technical Education, Telangana State, and Director of Jawaharlal Nehru Technological University, Hyderabad.

Funding

The research did not receive any specific grant from funding agencies in the public, commercial or not-for-profit sectors.

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Contributions

Conceptualization, methodology: AK; formal analysis and investigation: AK, RK; writing-original draft preparation: AK; supervision: NRC, KVG.

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Correspondence to Ashok Kadaverugu.

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The authors declare that they have no conflict of interest.

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Kadaverugu, A., Kadaverugu, R., Chintala, N.R. et al. Flood vulnerability assessment of urban micro-watersheds using multi-criteria decision making and InVEST model: a case of Hyderabad City, India. Model. Earth Syst. Environ. 8, 3447–3459 (2022). https://doi.org/10.1007/s40808-021-01310-5

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  • DOI: https://doi.org/10.1007/s40808-021-01310-5

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