Overview

This service is part of Esri UK's Maps+ offering. Created using the best available data sources, Maps+ is ready to use across the ArcGIS System. For more information including how-to guides, please see this site: Help | Maps+ (esriuk.com)

Ordnance Survey ® MasterMap Water Network layer provides a detailed, heighted water network, showing the flow and precise course of every river, stream, lake and canal in Great Britain. The layer contains network lines (links) which are attributed to provide a range of information about the section of watercourse that they depict. Watercourses that are below structures or underground are included in the dataset where Ordnance Survey capture processes or accepted sources can infer the connection. The data is available for all of Great Britain (England, Scotland and Wales). The data has been collected by Ordnance Survey and is based on the British National Grid.

The Water Network is provided with three-dimensional coordinates as well as attribute information that could be used to support a range of applications, including:

• Flood prediction, protection and response measures
• Tracking water flows and contamination
• The management of statutory directives relating to watercourses
• Ecology studies, for example species migration
• Use in combination with other Ordnance Survey products for better understanding, analytics and visualisation, for example OS Terrain 5

The key characteristics and benefits or the Ordnance Survey MasterMap Water Network layer include:

• Flow and connectivity
• Three dimensional geometry, as well as average widths
• Catchment information including name
• Vertical relationships where watercourses pass over or under one another
• Additional information provided by national authorities
• The underlying data is developed, managed, and maintained by Ordnance Survey within one of the world’s largest spatial databases.
• Each feature is uniquely referenced and has attributes that record the feature’s life cycle. The life cycle records certain types of changes to the feature that occur over time.

For further information, please see OS MasterMap Water Network Layer support page.

For technical information on this dataset, please see OS MasterMap Water Network Technical Specification

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Hyperlink: https://www.ordnancesurvey.co.uk/business-government/products/mastermap-water

Data Release Date: July 2022