© Crown copyright and database rights 2026 Ordnance Survey 0100031673

OS NGD Water Network provides a three-dimensional structured link and node network of watercourses in Great Britain along with water features depicted by a line rather than polygon geometry:

- Water Link Feature: represents the alignment and connectivity of permanent water (including inland rivers, tidal water, lakes, canals) with flow direction and catchment name.

- Water Link Set Feature: represents named bodies of water that the water network flows through as single geometry for a complete named watercourse. Includes a cross reference table, referencing the Water Link Set back to Water Links.

- Water Node Feature: depicts the location where a connected area of permanent water ends, where an area of permanent water is connected to two or more other areas of permanent water, or where a recorded attribute changes for an area of permanent water.

OS NGD Water Network is intended to enhance systems used to manage the flood hazard posed by waterways and rivers. It can be used to undertake analysis and visual interpretation or to display bodies of water and water catchments as a backdrop map. Unique identifiers, including Ordnance Survey ID (OSID) to enable data linking and analysis. This product replaces OS MasterMap Networks Water Layer