Scale	1:50 000
Coverage	Great Britain
Format	GIS polygon data. (ESRI, MapInfo, others available by request)
Price	10p per km2. Subject to licence fee and data preparation fee. More information about licensing data
Downloads	Sample map User guide

The term permeability refers to whether and how water can flow through a rock.

Permeability data is often used in studies of groundwater and in particular during investigations of pollution or aquifer contamination.

The BGS has prepared permeability information based on the 1:50 000 Digital Geological Map of Great Britain (DiGMapGB).

The permeability indices are based on geological considerations and are as follows:

• the predominant flow mechanism, either intergranular flow, fracture flow, or a mixture of intergranular and fracture flow
• a maximum permeability index
• a minimum permeability index

The permeability indices indicate the range of permeability likely to be encountered for each DiGMapGB unit.

The maximum and minimum permeability indices are divided into five classes: very high, high, moderate, low, and very low permeability.

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