Halkyn–Milwr Drainage Adit Network (North East Wales)
This dataset represents the approximate locations of the Halkyn and Milwr drainage adit (tunnel) system beneath North East Wales. The adit network was constructed in the early 20th century to lower the regional water table and facilitate metal mining operations in the area.
The dataset supports understanding of groundwater drainage processes across Flintshire, where flows are significantly influenced by the presence of the adit system. The mapped locations provide a general representation of the network to inform hydrological and environmental assessments.
Please ensure the information warning in the lineage is read and complied with.
- Identification
- Extent
- Distribution
- Quality
- Keywords
- Spatial Reference System
- Content
- Constraints
- Maintenance
- Metadata
Identification
- Identifier
- NRW_DS161541
- Alternative Title
-
- Halkyn–Milwr Drainage Adit Network.lyr
- Metadata Language
- English
- Lineage
-
This dataset has been compiled incrementally over several years using a combination of historical records, legacy datasets, and internal knowledge sources. In some cases, the original source materials are no longer available or cannot be fully verified.
The mapped locations therefore represent an interpreted and generalised alignment of the Halkyn and Milwr adit system rather than a precise survey. Positional accuracy may vary, but the dataset is considered sufficient for providing an indicative representation of the network and supporting internal understanding of groundwater drainage processes in the area.
Information warning: the dataset is derived from historical information and should be regarded as a reference source only. Due to the age of the source material and uncertainties in the recorded and mapped locations, the accuracy and completeness of the dataset cannot be guaranteed. It is not suitable for operational use, detailed site-specific analysis, or decision-making without independent verification from the data custodian.
- Dataset Reference Date (Creation)
- 2026-06-09
- Dataset Reference Date (Publication)
- 2026-09-04
Temporal Extent
- Begin date
- 2026-05-28
- Topic category
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- Geoscientific information
Extent
Extent
- Geographic Extent
- Wales (WLS)
))
Distribution
- Format Type and Description
-
-
Geographic Information System
(
Unknown
)
- Specification
-
ESRI Feature Class
-
Geographic Information System
(
Unknown
)
Quality
Data quality
- Quality Scope
- Dataset
- Conformity
- Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services
- Explanation
-
This dataset has not been assessed for conformance to the referenced INSPIRE regulation.
- Degree
- false
- Lineage
-
This dataset has been compiled incrementally over several years using a combination of historical records, legacy datasets, and internal knowledge sources. In some cases, the original source materials are no longer available or cannot be fully verified.
The mapped locations therefore represent an interpreted and generalised alignment of the Halkyn and Milwr adit system rather than a precise survey. Positional accuracy may vary, but the dataset is considered sufficient for providing an indicative representation of the network and supporting internal understanding of groundwater drainage processes in the area.
Information warning: the dataset is derived from historical information and should be regarded as a reference source only. Due to the age of the source material and uncertainties in the recorded and mapped locations, the accuracy and completeness of the dataset cannot be guaranteed. It is not suitable for operational use, detailed site-specific analysis, or decision-making without independent verification from the data custodian.
Keywords
Keywords
- Type
- Theme
Citation
- Date (Publication)
- 2008-06-01
Keywords
-
NRW Thesaurus
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- drainage
- hydrogeology
- Type
- Theme
Citation
- Date (Publication)
- 2026-08-27
Spatial Reference System
Content
Content Information
NRW Profile
Custom Elements
Constraints
Constraints
Limitations on Public Access and Use
- Restriction type
- Other restrictions
Access Constraints Directive
- Limitations
- noLimitations
Access Constraints Text
- Other constraints
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There are no access restrictions on this data. NRW may release, publish or disseminate it freely.
Use Constraints
- Use constraints type
- Other restrictions
- Other constraints
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© CNC/NRW. Data may be re-used under the terms of the Open Government Licence providing it is done so, acknowledging both the source and NRW's copyright. It is the recipient's responsibility to ensure the data is fit for the intended purpose.
Attribution Statement
- Other constraints
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Contains Natural Resources Wales information © Natural Resources Wales and Database Right. All rights Reserved.
Licence
- Other constraints
- Open Government Licence