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Coastal flooding

Two questions 

1.Am I right in thinking that the difference between 'Flood Map for Planning (Rivers and Sea)' and 'Risk of Flooding from Rivers and Sea' is that the latter includes the impacts of flood defences but the former assumes they don't exist?

2. Is it possible to work out using these two data sets which areas are at risk from coastal flooding when flood defences are taken into account?

Many thanks

Wesley Stephenson //

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Hi Wesley,

I have asked our Flood Mapping team to provide a response to your questions.

Thanks,

Dan Haigh, EA Data Sharing & Access team

DS&A Team 0 votes //
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Wesley,

Thank you for your questions - please find answers below:

  1. Yes, you are correct.  The Risk of Flooding from Rivers and Sea (RoFRS) data provides an assessment of the chance of flooding from rivers and/or the sea which takes into account the presence and condition of flood defences.  The Flood Map for Planning shows the best estimate of the areas of land at risk of flooding when the presences of defences are ignored.  There is also another key distinction between these datasets.  RoFRS represents a probabilistic model, describing overall risk rather than the risk associated with a specific scenario, where as the Flood Map for Planning provides a deterministic assessment associated with specific scenarios outlined within Planning Policy Guidance.  For this reason you cannot make direct comparisons between them.

  2.  The RoFRS data provides an assessment of the residual risk of flooding from the sea when defences are accounted for.  However, the product does not enable you to differentiate between the source of flooding (fluvial or coastal) contributing to this risk.

I hope this provides the clarity you require.

Kind regards,

Adam Tobin

FCRM Senior Advisor
Environment Agency - Evidence & Risk (Mapping and Analytics)

Adam Tobin 0 votes //
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