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

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
  • Geoscientific information
Owner
  Natural Resources Wales (NRW) -
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
Originator
  Natural Resources Wales (NRW) -
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
 

Extent

Extent

Geographic Extent
Wales (WLS)
N
W
E
S
Map representing the geographic extent of the dataset


 
 

Distribution

Format Type and Description
  • Geographic Information System ( Unknown )

    Specification

    ESRI Feature Class

 

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

GEMET - INSPIRE themes, version 1.0
Type
Theme

Citation

Date (Publication)
2008-06-01
Code
geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme

Keywords

NRW Thesaurus
  • drainage
  • hydrogeology
Type
Theme

Citation

Date (Publication)
2026-08-27
Code
geonetwork.thesaurus.local.theme.converted_nrw-keywords
 

Spatial Reference System

Code
British National Grid (EPSG:27700)
 

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

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

© 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

Contains Natural Resources Wales information © Natural Resources Wales and Database Right. All rights Reserved.
 

Licence

Other constraints
Open Government Licence
 
 
 

Metadata

Metadata

File Identifier
4f4c4942-4343-5764-6473-313631353431 XML
Metadata Language
English
Resource type
Dataset
Metadata Date
2026-09-04T13:28:07.354Z
Metadata Standard Name
NRW
Metadata Standard Version

1.0

pointOfContact
  Natural Resources Wales -
Maes y Ffynnon , Bangor , LL57 2DW , Wales
 
 

Publishing Body

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