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.

  • Networks
  • Download
  • Premium Plan
  • Public Sector Plan

This product is updated every three months

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© Crown copyright and database rights. Ordnance Survey 2025
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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.

OS MasterMap Networks - Water Layer

Technical information

© Crown copyright and database rights. Ordnance Survey 2025

Specifications

Access
  • Download
Data theme
  • Water
Data structure
Vector
Coverage
Great Britain
Scale
1:1 250 to 1:10 000
Format
  • GML
  • 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

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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
Update frequency
Every three months
View technical information

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