Using GIS for flood hazard assessment

Figures & data

Table 1. Big data and spatial analytics module cohort size.

	2020/21	2021/22	2022/23	2023/24
Cohort size	25	27	31	26

Figure 1. An analytical overview of population flood risk assessment using QGIS and R.

Table 2. Data sources.

Dataset name	Description	Source
OA NS-SEC	Output Area population count by National Statistics – Socio-economic Classification from the 2021 Census	Office for National Statistics (2023a)
OA PWC	Output Area Population Weighted Centroids for the 2021 Census	Office for National Statistics (2023b)
EA flood risk map	Environment Agency Flood Map Zone 3	Environment Agency (2023)

Figure 2. A map showing the location of population (by OA PWC) by flood risk exposure for SW England.

Figure 3. Bar chart showing the percentage SW England population by NS-SEC by flood risk using 2021 Census OA level data.

Office for National Statistics. (2023a). National statistics socio-economic classification (NS-SEC) variable: census 2021. Retrieved December 13, from https://www.ons.gov.uk/census/census2021dictionary/variablesbytopic/labourmarketvariablescensus2021/nationalstatisticssocio-economicclassificationns-sec

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Office for National Statistics. (2023b). Population weighted centroids: guidance for 2021 statistical geographies. Retrieved December 6, from https://open-geography-portalx-ons.hub.arcgis.com/datasets/ons:population-weighted-centroids-2021-statistical-guidance/about

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Environment Agency. (2023). Flood map for planning (rivers and sea) -flood zone 3. https://www.data.gov.uk/dataset/bed63fc1-dd26-4685-b143-2941088923b3/flood-map-for-planning-rivers-and-sea-flood-zone-3

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