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There are two main types of bedrock aquifer. In most of them, groundwater flows through fractures and fissures. In about half of the limestone rocks, groundwater flows through cavities and caves. This type of limestone is called karst. The bedrock aquifer map shows the potential of areas in Ireland to provide water supplies. There are three main groups based on their resource potential:Regionally important \u2013 the aquifers are capable of supporting large public water supplies sufficient to support a large town; Locally important \u2013 the aquifers are capable of supporting smaller public water supplies or group schemes; Poor \u2013 the aquifers are only capable of supporting small supplies, such as houses or farms, or small group schemes.The three main groups are broken down into seven bedrock aquifer categories in total. Please read the lineage for further details.Information used to assign bedrock aquifer categories include: rock type (Hydrostratigraphic Rock Unit Groups - simplified bedrock geology with similar hydrogeological properties), yield (existing wells and springs), permeability and structural characteristics. All of the information is interpreted by a hydrogeologist and areas are drawn on a map to show the aquifers.This Bedrock Aquifer map is to the scale 1:100,000 (1 cm on the map relates to a distance of 1km).It is a vector dataset. Vector data portray the world using points, lines, and polygons (areas).The aquifer data is shown as polygons. 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