The 1:50,000 scale maps display the principal, secondary and unproductive aquifers in two different types of aquifer designations (i.e. superficial and bedrock) in England.  br/>
Designations reflect the importance of aquifers as a source of drinking water and their role in supporting surface water flows and wetland ecosystems. Groundwater protection policy in England and Wales uses aquifer designations that are consistent with the Water Framework Directive.