Glossary: V

Variable

Data is updated ad hoc when it is available.

Void

In the artificial ground dataset a void is an area of ground which has had the natural geology wholly or partially removed, and which may have been filled with other material. However the void may not have been entirely filled - at this particular site for example, the void areas are areas where active railway tunnels are present. Waste

Treatment, Transfer, and Disposal Site (Waste TTD). Sites where waste is temporarily stored and/or treated before it is recycled or transported to landfill.