The Flood Zones show the probability of river and sea flooding, ignoring the presence of defences. There are four zones, 1, 2, 3a and 3b, that reflect the annual probability of flooding happening. This map shows all areas with more than a 1 in 1,000 annual probability of either river or sea flooding by combining zones 2, 3a and 3b. If you want to submit a planning application within these zones, you will need to do a flood risk assessment. For a full explanation of when a flood risk assessment is required, visit https://www.gov.uk/guidance/flood-risk-assessment-for-planning-applications#when-you-need-an-assessment. To view more detailed information on the flood zones, visit https://flood-map-for-planning.service.gov.uk/.
