GSNI GeoIndex Bedrock Aquifer
type: Dataset
description: This map layer shows the classification of bedrock, as mapped at 1:250 000 scale, into aquifer categories. This classification was initially undertaken to support groundwater assessments undertaken for the Water Framework Directive (2000/60/EC). The classification was produced on behalf of Northern Ireland Environment Agency (NIEA) (DoE, Northern Ireland) and is the standard classification currently used for assessing activities which may impact on groundwater resources. The classification comprises six categories of bedrock aquifer, based upon relative resource productivity and flow type. Bedrock aquifer classification categories and overview description Bedrock High potential productivity fracture flow: Bh (f): High to moderate yields probable, however dependence on fracture flow makes poorer yields possible. Generally includes element of regional flow (kms). High potential productivity fracture/intergranular flow: Bh (l to f): High to moderate yields probable, however part dependence on fracture flow makes poorer yields possible. Dual porosity. Generally includes element of regional flow. High potential productivity fracture flow with karstic element: Bh (f to k): High to moderate yields probable, however dependence on fracture flow makes poorer yields possible. Evidence of karstic flow. Generally includes element of regional flow. Moderate potential productivity fracture flow: Bm (f): High to moderate yields possible in places however dependence on fracture flow makes poorer yields possible. Potential element of regional flow, but local flow significant. Limited potential productivity fracture flow: Bl (f): Moderate yields unusual. Low yields more common. Regional flow limited. Mainly shallow, local flow. Poor potential productivity fracture flow: Bp (f): Small supplies may be possible but strata rarely exploited. Negligible regional flow. Limited local flow The classification is intended to represent general regional differences in resource potential and domina…
keyword: Aquifers
keyword: Geology
keyword: Hydrogeology
keyword: NERC_DDC
issued: 2025-12-03T11:04:12.472663
modified: 2026-07-30T21:00:08.135980
spatial: Location
  geometry: {"type": "Polygon", "coordinates": [[[-5.4100, 51.3600], [-10.6400, 51.3600], [-10.6400, 55.4400], [-5.4100, 55.4400], [-5.4100, 51.3600]]]}

British Geological Survey (BGS)
type: Organization

GSNI GeoIndex
type: Distribution
description: Resource locator
media type: text/html
format: HTML
access URL: https://mapapps2.bgs.ac.uk/GSNI_Geoindex/home.html
issued: 2026-07-30T21:00:08.176100
modified: 2026-07-30T21:00:08.141308