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Groundwater is the water that soaks into the ground from rain and can be stored beneath the ground. An aquifer is a body of rock and/or sediment that holds groundwater. The process of rain filling up an aquifer is called \u2018recharge\u2019. <\/SPAN><\/SPAN><\/P>

The Groundwater Recharge map shows the amount of rainfall which reaches the stores of groundwater (the \u2018aquifers\u2019) across Ireland. The amount of recharge was calculated over the period 1981-2010 and then averaged to give a yearly amount.<\/SPAN><\/SPAN><\/P>

Geological information used to create the map includes soil drainage, subsoil type, subsoil permeability, subsoil thickness, groundwater vulnerability and aquifers. The amount of rain falling on the land minus how much of that rain is taken up by plants is also a factor that determines how much groundwater recharge there is at a particular location. This is known as the \u2018effective rainfall\u2019.<\/SPAN><\/SPAN><\/P>

Different combinations of the geological factors give 24 hydrogeological scenarios. There is a \u2018recharge coefficient\u2019 for each scenario, which is the percentage of the \u2018effective rainfall\u2019 that may become groundwater recharge. All the information is interpreted by a hydrogeologist and using ArcGIS software the data is merged to create areas on a map to show the recharge. Please read the lineage for more detail.<\/SPAN><\/SPAN><\/P>

This map is to the scale 1:40,000. This means it should be viewed at that scale. When printed at that scale 1cm on the map relates to a distance of 400m.<\/SPAN><\/SPAN><\/P>

It is a vector dataset. Vector data portray the world using points, lines, and polygons (areas). The recharge data is shown as polygons. Each polygon holds information on:<\/SPAN><\/SPAN><\/P>

  • Recharge Unique ID \u2013 GSI ID<\/SPAN><\/SPAN><\/P><\/LI>

  • Average Recharge (mm/yr) - average annual recharge to the groundwater aquifer across that polygon<\/SPAN><\/SPAN><\/P><\/LI>

  • Hydrogeological Setting Code - determined by the combinations of different geological layers<\/SPAN><\/SPAN><\/P><\/LI>

  • Hydrogeological Setting Description \u2013 the description of the main geological layers that combine to let different amounts of rainfall through to become groundwater<\/SPAN><\/SPAN><\/P><\/LI>

  • Recharge Coefficient (%) \u2013 the proportion of effective rainfall that becomes groundwater<\/SPAN><\/SPAN><\/P><\/LI>

  • Effective Rainfall (mm/yr) \u2013 the rainwater remaining after plants have taken up some of the rainfall<\/SPAN><\/SPAN><\/P><\/LI>

  • Recharge Cap Apply \u2013 is there a maximum amount of recharge that the aquifer can accept? (Yes/ No)<\/SPAN><\/SPAN><\/P><\/LI>

  • Maximum Recharge Capacity (mm/yr) \u2013 the maximum amount of recharge the aquifer can accept. Only applies to bedrock aquifers of category Ll, Pl, or Pu.<\/SPAN><\/SPAN><\/P><\/LI>

  • Average Recharge (mm/yr) Pre-Cap \u2013 effective rainfall x recharge coefficient, not limited by maximum recharge capacities<\/SPAN><\/SPAN><\/P><\/LI>

  • Soil Drainage \u2013 whether the soil is well drained or poorly drained<\/SPAN><\/SPAN><\/P><\/LI>

  • Subsoil Category \u2013 the code for the subsoil type<\/SPAN><\/SPAN><\/P><\/LI>

  • Subsoil Description \u2013 description of the subsoil type<\/SPAN><\/SPAN><\/P><\/LI>

  • Peat \u2013 whether the soil is peat or not peat<\/SPAN><\/SPAN><\/P><\/LI>

  • Sand/Gravel Subsoil \u2013 whether the subsoil is sand/gravel or not<\/SPAN><\/SPAN><\/P><\/LI>

  • Subsoil Permeability Code - the code for the permeability of the subsoil <\/SPAN><\/SPAN><\/P><\/LI>

  • Subsoil Permeability Description \u2013 description of the subsoil permeability<\/SPAN><\/SPAN><\/P><\/LI>

  • Vulnerability Category \u2013 the code for the groundwater vulnerability<\/SPAN><\/SPAN><\/P><\/LI>

  • Vulnerability Description \u2013 the groundwater vulnerability description<\/SPAN><\/SPAN><\/P><\/LI>

  • Aquifer Category \u2013 the aquifer category code<\/SPAN><\/SPAN><\/P><\/LI>

  • Aquifer Description \u2013 the aquifer category description<\/SPAN><\/SPAN><\/P><\/LI>

  • Sand/Gravel Aquifer Category \u2013 whether there is a sand and gravel aquifer at this location <\/SPAN><\/SPAN><\/P><\/LI>

  • Peat Area (m2) in Sand/Gravel Aquifer \u2013 the percentage area of a sand and gravel aquifer covered by peat<\/SPAN><\/SPAN><\/P><\/LI>

  • Annual Recharge Range (mm/yr) - Annual Recharge (mm) categorised into a range of values used to style the map.<\/SPAN><\/SPAN><\/P><\/LI><\/UL><\/DIV><\/DIV><\/DIV>", "mapName": "IE GSI Groundwater Recharge 40K Ireland (ROI) ITM", "description": "Groundwater is the water that soaks into the ground from rain and can be stored beneath the ground. An aquifer is a body of rock and/or sediment that holds groundwater. The process of rain filling up an aquifer is called \u2018recharge\u2019. The Groundwater Recharge map shows the amount of rainfall which reaches the stores of groundwater (the \u2018aquifers\u2019) across Ireland. The amount of recharge was calculated over the period 1981-2010 and then averaged to give a yearly amount.Geological information used to create the map includes soil drainage, subsoil type, subsoil permeability, subsoil thickness, groundwater vulnerability and aquifers. The amount of rain falling on the land minus how much of that rain is taken up by plants is also a factor that determines how much groundwater recharge there is at a particular location. This is known as the \u2018effective rainfall\u2019.Different combinations of the geological factors give 24 hydrogeological scenarios. There is a \u2018recharge coefficient\u2019 for each scenario, which is the percentage of the \u2018effective rainfall\u2019 that may become groundwater recharge. All the information is interpreted by a hydrogeologist and using ArcGIS software the data is merged to create areas on a map to show the recharge. Please read the lineage for more detail.This map is to the scale 1:40,000. This means it should be viewed at that scale. When printed at that scale 1cm on the map relates to a distance of 400m.It is a vector dataset. Vector data portray the world using points, lines, and polygons (areas). The recharge data is shown as polygons. Each polygon holds information on:Recharge Unique ID \u2013 GSI IDAverage Recharge (mm/yr) - average annual recharge to the groundwater aquifer across that polygonHydrogeological Setting Code - determined by the combinations of different geological layersHydrogeological Setting Description \u2013 the description of the main geological layers that combine to let different amounts of rainfall through to become groundwaterRecharge Coefficient (%) \u2013 the proportion of effective rainfall that becomes groundwaterEffective Rainfall (mm/yr) \u2013 the rainwater remaining after plants have taken up some of the rainfallRecharge Cap Apply \u2013 is there a maximum amount of recharge that the aquifer can accept? (Yes/ No)Maximum Recharge Capacity (mm/yr) \u2013 the maximum amount of recharge the aquifer can accept. Only applies to bedrock aquifers of category Ll, Pl, or Pu.Average Recharge (mm/yr) Pre-Cap \u2013 effective rainfall x recharge coefficient, not limited by maximum recharge capacitiesSoil Drainage \u2013 whether the soil is well drained or poorly drainedSubsoil Category \u2013 the code for the subsoil typeSubsoil Description \u2013 description of the subsoil typePeat \u2013 whether the soil is peat or not peatSand/Gravel Subsoil \u2013 whether the subsoil is sand/gravel or notSubsoil Permeability Code - the code for the permeability of the subsoil Subsoil Permeability Description \u2013 description of the subsoil permeabilityVulnerability Category \u2013 the code for the groundwater vulnerabilityVulnerability Description \u2013 the groundwater vulnerability descriptionAquifer Category \u2013 the aquifer category codeAquifer Description \u2013 the aquifer category descriptionSand/Gravel Aquifer Category \u2013 whether there is a sand and gravel aquifer at this location Peat Area (m2) in Sand/Gravel Aquifer \u2013 the percentage area of a sand and gravel aquifer covered by peatAnnual Recharge Range (mm/yr) - 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