Coastal Flood Risk Assessment – Dunbar Golf Club, East Lothian

Challenge

Dunbar Golf Club in East Lothian were proposing to develop an area of land for residential use as well as relocating the existing club house. The proposed development site was partially located within the Scottish Environment Protection Agency’s (SEPA) indicative coastal flood map outlines, and as such required a more detailed, site specific Flood Risk Assessment (FRA) to be undertaken.

Solution

A Flood Risk Assessment identifies the potential risk of flooding to the development site as well as considering how your site may affect potential flooding elsewhere. The analysis for this site included the following:

  • Calculation of extreme sea levels to assess the risk from still water levels.
  • Calculation of offshore wave characteristics, including the assessment of wind speeds and fetch lengths from different directions.
  • Calculation of nearshore wave characteristics, assessing how the deep water waves would transform as the enter the nearshore region and reach the toe of the defences.
  • Wave overtopping calculations to assess how the nearshore waves interact with the beach and hard defences present.
  • Joint probability analysis to assess the likelihood of high still water levels occurring at the same time as large waves.
  • Flood inundation modelling to assess where any water overtopping the frontage would flow to.

Benefit

The study showed that, whilst part of the site was not deemed appropriate for development, a large portion was located outside the flood extents and was suitable for development. A particular area of focus was the access route into the site, which ran along the sea front directly behind the existing defences, and recommendations for emergency access and egress measures were therefore made within the report.

Want to know more?

Email Nicola Buckley for more information on this project, or visit our Coastal Flood Risk Assessment webpages. You may also be interested in our coastal flood modelling and forecasting web pages.



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