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The Sand and Gravel aquifer map shows land areas in Ireland where sands and gravels beneath the ground contain enough groundwater to provide significant water supplies. They are classified as either:Regionally important \u2013 the aquifers are capable of supporting large public water supplies sufficient to support a large town; orLocally important \u2013 the aquifers are capable of supporting smaller public water supplies or group schemes; Geologists record information about how thick the sand and gravel layers on top of the bedrock are. They also note down how big the different grains of sand and gravel are. Information from quarries and deep pits is used. Information from boreholes (a deep narrow round hole drilled in the ground) is also used. All of the information is interpreted by a hydrogeologist and areas are drawn on a map to show the aquifers.This Sand and Gravel Aquifer map is to the scale 1:40,000 (1 cm on the map relates to a distance of 400 m).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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