OS MasterMap Networks - Water Layer

OS MasterMap Networks - Water Layer provides a detailed centre line following the curve of the waterway precisely. It includes the coordinates of watercourse sources and where they meet, exactly. OS MasterMap Networks – Water Layer will become End of Life on 31 March 2026. As of this date, Ordnance Survey will cease to maintain or publish updates, and access to the product will be removed from the OS Data Hub, OS Features API and OS Vector Tile API. Further information and details about the recommended product migration pathway are available on the OS docs platform, which can be found under 'Additional information' on the technical information tab.

Networks
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Premium Plan
Public Sector Plan

This product is updated quarterly

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What OS MasterMap Networks - Water Layer provides you with

Content and context

With this water network data, you can look up the height of any water course, along with its flow direction, gradient, length and width anywhere along its length.

Precise watercourses details

As an island, water defines Great Britain. No other visualisation of our nation’s watercourses details the heights of watercourses in relation to sea level with this level of precision.

Complete picture in 2D and 3D

For planners, for surveyors, for engineers – this Layer offers the potential to model in 2D and 3D like never before, thanks to the clarity of river flow, gradient and river widths.

Answers on tap

From aqueducts to tunnels, with annotations of flow direction, OS MasterMap Water Network Layer provides the detailed mapping that’s most useful – including underground watercourses (inferred from entry and exits).

Detailed centre line

OS MasterMap Networks - Water Layer provides a detailed centre line following the curve of the waterway precisely. It includes the coordinates of watercourse sources and where they meet, exactly.

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Download a small area of OS MasterMap Networks - Water Layer.

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Or try out the real thing by applying for a Data Exploration Licence

OS MasterMap Networks - Water Layer

Technical information

Specifications

Access: Download
Data theme: Water
Data structure: Vector - Topologically structured link and node network
Coverage: Great Britain
Scale: 1:1250 to 1:10,000
Format: GML 3.2.1
GeoPackage
Vector Tiles
Ordering area: All of Great Britain or customisable area (5km2 tiles)
Publication months: January
April
July
October
OS Data Hub plan: Premium Plan
Public Sector Plan

Documents and Support

Technical documentation

OS MasterMap Networks - Water Layer: Technical documentation
Visit docs.os.uk to access all technical documentation for this product, including product and getting started guides, technical specifications, XML information and release notes.
link

Additional information

End of Life product notices

Further information and details about the recommended product migration pathway are available on the End of Life product notices page.

OS MasterMap Networks - Water Layer

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What you get

Key features: Content and context
Precise watercourses details
Complete picture in 2D and 3D
Answers on tap
Detailed centre line
Category: Networks
Access: Download
Data structure: Vector - Topologically structured link and node network
Update frequency: Quarterly

View technical information

Try this product with free sample data

Download a small area of OS MasterMap Networks - Water Layer.

Get sample data

Or try out the real thing by applying for a Data Exploration Licence

How to access

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