When Is a Flood Risk Assessment Required?
In England and Wales, the Environment Agency requires a professional Flood Risk Assessment (FRA) to be submitted alongside planning applications in areas that are known to be at risk of flooding. You will also need A Flood Risk Assessment if the proposed development is taking place within 20 metres of an Environment Agency main river.
To find out if you are in a flood zone or which flood zone you are in, you can use the gov.uk online search facility which allows you to search by place name or postcode, National Grid Reference (NGR) or by Easting and Northing. This can be found here flood-map-for-planning.service.gov.uk
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); and
• In an area within flood zone 1 which has critical drainage problems as notified by the Environment Agency.
It is also advisable to contact your local planning authority to check if the site is located within an area identified as having critical drainage issues.