Flood Risk Assessments2018-02-07T19:50:10+00:00

Flood Risk Assessments

Financial Planning

You need to do a flood risk assessment for most developments within one of the flood zones:

Flood Zone Definitiion
Zone 1 Low Probability Land having a less than 1 in 1,000 annual probability of river or sea flooding. (Shown as ‘clear’ on the Flood Map – all land outside Zones 2 and 3)
Zone 2 Medium Probability Land having between a 1 in 100 and 1 in 1,000 annual probability of river flooding; or land having between a 1 in 200 and 1 in 1,000 annual probability of sea flooding. (Land shown in light blue on the Flood Map)
Zone 3a High Probability Land having a 1 in 100 or greater annual probability of river flooding; or Land having a 1 in 200 or greater annual probability of sea flooding.(Land shown in dark blue on the Flood Map)
Zone 3b The Functional Floodplain This zone comprises land where water has to flow or be stored in times of flood. Local planning authorities should identify in their Strategic Flood Risk Assessments areas of functional floodplain and its boundaries accordingly, in agreement with the Environment Agency. (Not separately distinguished from Zone 3a on the Flood Map)

This includes developments:

  • in flood zone 2 or 3 including minor development and change of use
  • more than 1 hectare (ha) in flood zone 1
  • less than 1 ha in flood zone 1, including a change of use in development type to a more vulnerable class (for example from commercial to residential), where they could be affected by sources of flooding other than rivers and the sea (for example surface water drains, reservoirs)
  • in an area within flood zone 1 which has critical drainage problems as notified by the Environment Agency

If you would like to discuss how we can help you with land and town planning and development advice contact us and we would be delighted to assist.

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