River Basin District Catchment

A river basin or several river basins together with associated coastal waters. This is the least-detailed level of catchment published by authoritative bodies. A river basin district is the main unit for management of river basins under the Water Framework Directive.

The Water Framework Directive (WFD) provides a framework for assessing and managing the water environment in the European Union (EU). Since leaving the EU, the WFD has been replaced in England and Wales by the 'Water Environment (Water Framework Directive) (England and Wales) Regulations 2017'. In Scotland, the WFD was transposed into Scottish legislation by the 'Water Environment and Water Services (Scotland) Act 2003'.

Temporal filtering

The earliest date on which you can request a one-off snapshot of a date in the past for data in this feature type is 28 March 2023.

Any data temporally filtered earlier than the specified earliest date noted above for the data schema version may contain data inconsistencies.

Feature type attributes

The following sub-sections provide details about the attributes included with this feature type, their data types in the different output formats, and other important metadata about them.

Loading OS NGD CSV files into databases

Comma-separated values (CSV) file format is universally supported for easy ingestion into all major database products. Before loading OS NGD data contained in CSV files into a database, it is necessary to create relevant tables. Data definition language (DDL) statements for PostgreSQL, SQL Server and Oracle can be accessed in our OS NGD Resources GitHub repository.

For instructions on loading CSV files, see the Getting Started with CSV guide.

osid

The primary identifier for the feature. The OSID is a Globally Unique Identifier (GUID) and requires no centralised authority to ensure uniqueness. Note that the same OSID can occur in more than one feature type when a single feature is represented multiple times in the OS NGD.

• Data Types: String (GeoJSON), String (GPKG), String (CSV)

• Nullable: false

• Max Length: 36

• OS Select+Build Filterable: No

• Data Schema Version: 1.0

versiondate

The date the version was last updated.

• Data Types: String (GeoJSON), Date (GPKG), Date (CSV)

• Nullable: false

• OS Select+Build Filterable: No

• Data Schema Version: 1.0

versionavailablefromdate

The date this version of the feature became the latest version.

• Data Types: String (GeoJSON), DateTime (GPKG), DateTime (CSV)

• Nullable: false

• OS Select+Build Filterable: No

• Data Schema Version: 1.0

versionavailabletodate

The date this version of the feature was superseded by an update or ceased to exist.

• Data Types: String (GeoJSON), DateTime (GPKG), DateTime (CSV)

• Nullable: true

• OS Select+Build Filterable: No

• Data Schema Version: 1.0

changetype

The type of change that generated a new version of the feature.

• Data Types: String (GeoJSON), String (GPKG), String (CSV)

• Nullable: false

• Code List Name: changetypevalue

• Max Length: 50

• OS Select+Build Filterable: No

• Data Schema Version: 1.0

geometry

The geometry for the feature.

• Data Types: Geometry (GeoJSON), Geometry (GPKG), WKT (CSV)

• Nullable: false

• OS Select+Build Filterable: No

• Data Schema Version: 1.0

• Geometry Type: MultiPolygon

geometry_area_m2

The measured area of the geometry in square metres.

• Data Types: Number (GeoJSON), Float (GPKG), Real (CSV)

• Nullable: false

• Precision: 15

• Scale: 3

• OS Select+Build Filterable: No

• Data Schema Version: 1.0

geometry_source

The source organisation that provided the data.

• Data Types: String (GeoJSON), String (GPKG), String (CSV)

• Nullable: true

• Max Length: 85

• OS Select+Build Filterable: No

• Data Schema Version: 1.0

theme

The OS NGD theme to which this feature belongs.

• Data Types: String (GeoJSON), String (GPKG), String (CSV)

• Nullable: false

• Code List Name: themevalue

• Max Length: 40

• OS Select+Build Filterable: No

• Data Schema Version: 1.0

description

A single descriptive value intended for a quick understanding of what the feature represents.

• Data Types: String (GeoJSON), String (GPKG), String (CSV)

• Nullable: false

• Code List Name: riverbasindistrictcatchmentdescriptionvalue

• Max Length: 30

• OS Select+Build Filterable: No

• Data Schema Version: 1.0

riverbasindistrictid

The code of the catchment area assigned by the authoritative body.

• Data Types: Integer (GeoJSON), Integer (GPKG), Integer (CSV)

• Nullable: false

• OS Select+Build Filterable: Yes

• Data Schema Version: 1.0

riverbasindistrictname

The name of the catchment area assigned by the authoritative body.

• Data Types: String (GeoJSON), String (GPKG), String (CSV)

• Nullable: false

• Max Length: 15

• OS Select+Build Filterable: Yes

• Data Schema Version: 1.0