Flood Zone 3 means land which has —
(i) a 1 in 100 or greater annual probability (chance) of river flooding (>1%) ; or
(ii) a 1 in 200 or greater annual probability probability (chance) of sea flooding (>0.5%)
Where do I find this information?
Flood Zones form part of the Environment Agency's Flood Map. Flood Zone 3 is shown by the areas shaded dark blue on the Flood Map.
This information is provided to Local Planning Authorities on the Flood Map CD. The Environment Agency contacts Local Planning Authorities quarterly either to update the information on the Flood Map or to confirm that there have been no changes to the Flood Map information for that Authority's area. Flood Map is also available to view on the Environment Agency's website at www.environment-agency.gov.uk.