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  • Mapping national-scale fluvial flooding for SEPA

    Second generation flood map for Scotland
  • Second generation flood map for Scotland
  • Second generation flood map for Scotland
  • Second generation flood map for Scotland
  • Second generation flood map for Scotland

Second generation flood map for Scotland

HR Wallingford developed a methodology for mapping national-scale fluvial flooding for SEPA (Scottish Environment Protection Agency) that provides the fluvial flood outlines for the national flood mapping tool on their website.

HR Wallingford developed a flood map for SEPA that provides a strategic national overview of flooding. It is also intended to help improve public awareness of flood risk and to encourage actions that reduce this risk. Local authorities can use the information to be proactive in their responsibilities for managing flood risk – better awareness of which land is at risk of flooding means that they can develop their flood risk management strategies in effective combination with SEPA’s flood warning role. The mapping system will also help in planners locating of new homes, businesses and other developments taking into account flood risk.

We applied a suite of tools to the whole of Scotland to produce flood outlines. These included GTI Floodplain (an internal GIS-based tool comprising detailed data manipulation routines), the Conveyance Estimation System and the InfoWorks RS modelling software. Flood outlines were produced for return periods of 100, 200 and 1000 years. The scale of a flood depends on factors such as the amount and intensity of rainfall and catchment conditions (hilly/vegetated, how dry or wet the ground is). Independent coastal flood outlines were also incorporated.

The website shows river and coastal flooding, and flood defence scheme assets. Multimap mapping technology was combined with SEPA’s flooding data, to create a single interface where citizens, investors, and property planners, can visualise the flooding risk areas on map, at a glance. The flood hazard maps (up to 1:25,000 scale) cover the whole of Scotland, including all river reaches with catchments greater than 3 km2. A second layer shows the defence assets.

Read more information at

Local authorities can use the information to be proactive in their responsibilities for managing flood risk

Local authorities can use the information to be proactive in their responsibilities for managing flood risk

Contact

Andy Tagg

Andy Tagg

Technical Director

+44 (0)1491 822332

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Caroline Hazlewood

Caroline Hazlewood

Group Manager, Floods and software

+44 (0)1491 822226

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Project information

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