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Research Articles

Flood risk assessment data access and equity in Metro Vancouver

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Pages 202-215 | Received 10 May 2021, Accepted 04 Sep 2022, Published online: 28 Sep 2022
 

Abstract

Flood risk is increasing in many urban regions in Canada. Flood risk is the product of interaction between a flood hazard, the exposure of built assets, and the vulnerability of people to flood impacts. Flood risk assessment seeks to quantify each of these factors for a geographic space to identify areas with greater risk, which can inform public- and private-sector decision making. This study conducts a flood risk assessment of Metro Vancouver in British Columbia using only government-provided open data. It finds that flood hazards and social vulnerability are uneven across the study area, and it reveals inequity in open data access and quality between municipalities. It concludes that more standardized or centralized provision of open data could better support flood risk analysis in Metro Vancouver, which could inform flood management and help to reduce local risk.

Résumé

Le risque d'inondation est de plus en plus important au sein de nombreuses régions urbaines du Canada. Le risque d'inondation est le produit d'interactions entre la zone inondable, les bâtiments exposés, et la vulnérabilité de la population aux impacts des inondations. L'évaluation du risque d'inondation cherche à quantifier chacun de ces facteurs au milieu d’un domaine géographique afin d'identifier les zones présentant un risque plus élevé, pour mieux informer la prise de décision par les secteurs public et privé. Cette étude mène une évaluation des risques d'inondation dans la région métropolitaine de Vancouver en Colombie-Britannique en utilisant uniquement des données ouvertes fournies par le gouvernement. Notre étude constate que les risques d'inondation et la vulnérabilité sociale sont inégaux dans la zone d'étude, et il révèle qu’il existe une inégalité d'accès et de qualité des données ouvertes entre les municipalités. Il conclut que l’accès à des données ouvertes plus standardisée ou centralisée pourrait mieux soutenir l'analyse des risques d'inondation dans la région métropolitaine de Vancouver, ce qui permettra d’améliorer la gestion des inondations et aider à réduire les risques locaux.

Acknowledgements

The authors thank the reviewers and editor for their constructive comments on the manuscript.

Disclosure statement

No potential conflict of interest was reported by the authors.

Notes

1 The normalized difference vegetation index (NDVI) is a simple graphical indicator used in remote sensing to assess the extent to which a geographic area contains live green vegetation.

2 The topographic wetness index (TWI) is used to quantify topographic influence on hydrological processes.

3 A digital elevation model (DEM) is a 3D computer graphics representation of elevation data to represent terrain of a geographic area, which is typically produced through LiDAR remote sensing.

Additional information

Funding

This work was supported by the Marine Environmental Observation, Prediction and Response (MEOPAR) Network of Centres of Excellence of Canada.

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