Flood Risk Assessment

Why you need a Flood Risk Assessment

To obtain planning permission for your proposed development site you will need to carry out a flood risk assessment (FRA) and ensure your site follows the guidelines laid out in the National Planning Policy Framework.

An FRA assesses the risk of flooding from all sources, such as:

  • Rivers and seas
  • Rainfall
  • Rising groundwater
  • Sewers and drainage systems
  • Reservoirs, canals and lakes
  • Other artificial sources

    • When you need a Flood Risk Assessment

    You will need an FRA if it lies in one of these categories:

    • Lies in flood zone 2 or 3 of the Environmental Agency Flood Map, including minor development and change of use
    • Lies in flood zone 1 and is greater than 1 hectare (ha)
    • 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
    • In an area within flood zone 1 which has critical drainage problems as notified by the Environment Agency
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