Flood Risk Assessment
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What is a Flood Risk Assessment (FRA)? - An FRA identifies the level of flood risk to your property or site from all sources of flooding, and identifies the measures necessary (if any) to make the property or site safe in flood risk terms. 


When Do you need a FRA? - A FRA will be required for planning for most development within a flood risk area, as defined by the Environment Agency Flood Zones, if the Local Planning Authority is concerned about the risk from surface water flooding or if there are critical drainage problems. 

One may also be required for insurance if the site or property has flooded previously, or if the insurance companies flood data shows the area to be at risk of flooding, as part of a property purchase


When do you need a FRA for planning? - You need to do a flood risk assessment for most developments within one of the flood zones.

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


Find out what flood zone you're in


When you don't need an assessment - You don't need to do a flood risk assessment for a development that's less than 1 ha in flood zone 1 unless it could be affected by sources of flooding other than rivers and the sea, for example surface water drains.