All Wales Hydrological Analysis Flow Accumulation Raster
This layer was created to point to rasters used in NRW hydrological analysis tools. They are based upon the flow direction models which were created by the Environment Agency Detailed River Network which subsequently passed to NRW. The Flow Accumulation Raster is a count for each cell a count of how many other cells flow to it.
- Identification
- Extent
- Distribution
- Quality
- Keywords
- Spatial Reference System
- Content
- Constraints
- Maintenance
- Metadata
Identification
- Identifier
- NRW_DS123368
- Metadata Language
- English
- Lineage
-
Created as a precursor to the Ordnance Survey Mastermap Water Network. There is a lot of subjectivity in terms to the thresholds used to generate these by-products from the flow direction raster. It depends on intended use, spatial extent and scale. Changing these variables will alter the number and size of the resulting streams and catchments
Extent
Extent
- Geographic Extent
- Wales (WLS)
))
Distribution
- Format Type and Description
-
-
Geographic Information System
(
)
- Specification
-
ESRI Feature Class
-
Geographic Information System
(
)
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
-
Created as a precursor to the Ordnance Survey Mastermap Water Network. There is a lot of subjectivity in terms to the thresholds used to generate these by-products from the flow direction raster. It depends on intended use, spatial extent and scale. Changing these variables will alter the number and size of the resulting streams and catchments
Keywords
Keywords
- Type
- Theme
Citation
- Date (Publication)
- 2008-06-01
Keywords
-
NRW Thesaurus
-
- hydrometry
- Type
- Theme
Citation
- Date (Publication)
- 2026-03-04
Spatial Reference System
- Code
- NONE
Content
Content Information
NRW Profile
Custom Elements
Constraints
Constraints
Limitations on Public Access and Use
- Restriction type
- Other restrictions
Access Constraints Directive
- Limitations
- no limitations
Access Constraints Text
- Other constraints
-
Access restrictions on this data have not been determined. It may contain sensitive information and therefore may be restricted under legislation. NRW may provide access to this dataset on request, however NRW may not release, publish or disseminate the data or derived products freely without further assessment.
Use Constraints
- Use constraints type
- Other restrictions
- Other constraints
-
© CNC/NRW Data may only be re-used externally under provision and in line with the terms of a NRW licence following an assessment of the data.
Metadata
Metadata
- File Identifier
- 4f4c4942-4343-5764-6473-313233333638 XML
- Metadata Language
- English
- Resource type
- Dataset
- Metadata Date
- 2026-06-25T13:48:07.929Z
- Metadata Standard Name
- NRW
- Metadata Standard Version
-
1.0