GSI Groundwater Well and Spring Data

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Groundwater wells and springs. This database contains records of boreholes, dug wells, springs, and site investigations. Data are derived from GSI drilling, fieldwork and surveys, Local Authorities and other state bodies, Private Well Grants, Drillers, Consultants, Group Water Schemes and Academia. It is NOT a comprehensive database, and the locations of records have different precisions depending on the source data.

GSIName GSI's name for borehole/spring/trial pit/dug well OrigName Name of bh/spring/trial pit/etc. in original study SrcName Name of Supply Source Type Source Type, e.g. borehole, spring, dug well, unknown Depth_m Depth of hole (metres) Dpth-Rck_m Depth to rock (metres) DTRConfid Confidence in Depth to rock finding - met, presumed, unknown DrillDate Date well or spring construction commenced Easting Easting, six figure Irish National Grid reference Northing Northing, six figure Irish National Grid Reference Loc_Acc Spatial accuracy of the Grid Reference Townland Townland name SixInShtNo OSi Six Inch sheet number SourceUse The use to which the source is put, e.g., public supply souce, private, etc. Yield_m3d The yield of the source, cubic metres per day. Value given not always the sustainable yield. YldClass The GSI yield class. Boreholes: Excellent (>400m3/d), Good (100-400m3/d), Moderate (40-100m3/d), Poor (2160m3/d), Intermediate 430-2160m3/d), Low (<430m3/d) ProdClass The GSI Productivity Class. Related to specific capacity. Five classes range from I (best) to V (worst). Abstr_m3d Average reported daily abstraction, cubic metres per day. Correct value when record entered, may have changed since. Ovrflw_m3d Average daily overflow from spring, cubic metres per day. AbstrDDm The typical drawdown in the well, in metres, for the reported daily abstraction. SC_m3dm The specific capacity of the well (cubic metres per day per metre) at the stated daily abstraction rate. CasngDiamm Diameter of casing at top of hole (millimetres) Wtrstrk1_m First reported waterstrike encountered when drilling (metres) Wtrstrk2_m Second reported waterstrike encountered when drilling (metres) Wtrstrk3_m Third reported waterstrike encountered when drilling (metres) Wtrstrk4_m Fourth reported waterstrike encountered when drilling (metres) Wtrloss1_m Depth (metres) at which water loss occurred GenComms Comments, general DrillComms Comments, generally related to drilling conditions CasingComs Comments, on casing, conditions when drilling, water strikes, losses, quality

Data Resources (5)

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Theme Science
Date dataset released 1996-11-01
Date dataset updated 2016-11-15
Dataset conforms to these standards The INSPIRE Directive or INSPIRE lays down a general framework for a Spatial Data Infrastructure (SDI) for the purposes of European Community environmental policies and policies or activities which may have an impact on the environment.
Rights notes ['Creative Commons license conditions apply', '', 'license', '', 'license']
Update frequency Other
Language English
Landing Page
Geographic coverage in GeoJSON format {"type":"Polygon","coordinates":[[[-11.0, 50.0],[-11.0, 56.0], [-5.0, 56.0], [-5.0, 50.0], [-11.0, 50.0]]]}
Spatial Reference Systems (SRS) TM75 / Irish Grid (EPSG:29903)
Vertical Extent {"maxVerticalExtent": "1041", "verticalDomainName": "sea level", "minVerticalExtent": "0"}
Provenance information Application of the data: Local details are generalised to fit the original mapping and interpretation scale of 1:50,000. Evaluation of specific sites and circumstances will normally require further and more detailed assessments, and will often require site investigations. Sources of Information: Teagasc/EPA 1:40,000 Subsoil Map + Teagasc/EPA soils 1:40,000 GSI 1:50,000 Subsoil Permeability Map from county GWPSs and NDP-funded national mapping programme GSI 1:50,000 groundwater vulnerability map. GSI 1:100,000 Bedrock Aquifer map GSI 1:50,000 Sand and Gravel Aquifer map Met Eireann 1971-2000 Rainfall + AE Groundwater Recharge map creation technique: Created using tools built though ArcGIS model builder. On a county by county basis. In order for the Recharge map to be created, the recharge coefficient has to be calculated. This calculation depends on a large combination of conditions that are worked out from overlaying the following layers through a combination of unioning, intersecting, adding fields and calculating fields: 1. Teagasc Soils: For indicating areas of Peat and whether soil is wet or dry. 2. Teagasc Subsoils: For indicating sand and gravel soils. 3. Permeability 4. Vulnerability 5. Sand & Gravel Aquifers 6. National Aquifer dataset 7. Effective Rainfall (Met Eireann) The Recharge Map Creation tool goes through several different geoprocessing tasks. For each county: 1. Selecting the county: Union the Teagasc soil, sub-soil, Permeability and Vulnerability layers. 2. Unioning and intersecting with Fixed layers: -Intersecting Sand and Gravel Aquifer: This data will be included for analysis along with the Sand and Gravel soils from the Teagasc subsoils layer. -Intersecting National Aquifer: This layer will be used to calculate what cap (if any) will be applied to the potential recharge mm amount. -Aquifers of type LL, PU and PL will entail a capping on this final recharge figure. (100 or 200 mm/yr) 3. A hydrological Category is applied according to combination of values for each record. A recharge Coefficient is then calculated. 4.The final recharge value is calculated as Effective Rain amount x the %Recharge Coefficient. For further Information got to
Period of time covered (begin) 2000-01-01
Period of time covered (end) 2015-01-01