Geological indicators of flooding

Geological indicators of flooding sample.

Geological indicators of flooding coverage.

Scale 1:50 000
Coverage Great Britain
Format GIS polygon data (ESRI, MapInfo, others available by request)
Price 30p per km2 subject to licence fee and data preparation fee.
More information about licensing data
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Geological maps show where all the floodplains and coastal plains in Britain are located and therefore the main areas at greatest risk of flooding; from this information BGS has produced the Geological indicators of flooding dataset.

The map shows areas vulnerable to two main types of flooding — inland (river floodplains) and coastal/estuarine.

Inland flood plains are the flattish areas near to the river where mud, sand and gravel were deposited by previous floods.

On geological maps these materials are commonly known as 'alluvium', but they can also include lake deposits, and river terraces.

For coastal plains a range of marine deposits, for example tidal flats, define areas where the sea has formerly occupied the land.

The map is based on observation of the types of geological deposit present and does not take into account any man-made influences such as house building or flood protection schemes. It also doesn’t take into account low-lying areas where flooding could occur but where there are no materials indicating flooding in the geological past.

The BGS Geological indicators of flooding data should be regarded as complementary to, and not a replacement for, existing flood risk maps such as those provided by the Environment Agency.

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