Please note: this data is currently produced for areas where our Flood Zones datasets are based on national modelling. Areas where depth data is currently unavailable in this dataset are indicated using the Unavailable attribute.
These datasets show the depth of flooding from rivers and sea for the following annual exceedance probabilities or chance of flooding each year:
● Undefended: 0.1% AEP (1 in 1000) Rivers/Sea
● Undefended: 1% AEP (1 in 100) Rivers/ 0.5% (1 in 200) Sea
● Defended: 0.1% AEP (1 in 1000) Rivers/Sea
● Defended: 1% AEP (1 in 100) Rivers/ 0.5% (1 in 200) Sea
The data is presented using these depth bands:
● Up to 150mm
● 150 – 300mm
● 300 – 600mm
● 600 – 900mm
● 900 – 1200mm
● 1200 – 2300mm
● Over 2300mm
The undefended products show flood extents that ignore the presence and condition of flood defences.
The defended products take into account the presence of flood defences and assume that they operate in the way they were intended (or designed) to function. This does not include any asset failure (or removal) scenarios.
These datasets are designed to only give an indication of flood risk to an area of land and are not suitable for showing whether an individual property is at risk of flooding. This is because we cannot know all the details about each property.
Users of these datasets should always check they are suitable for the intended use. Attribution statement: © Environment Agency copyright and/or database right 2026. All rights reserved.
