OS MasterMap Water Network Layer

Open data API in a single place

Provided by Ordnance Survey

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Dataset information

Catalog

Ordnance Survey catalog

Country of origin

United Kingdom

Updated

Created

Available languages

English

Keywords

flow, river, watercourse, catchment area, tidal water, canal

Datasource

Official portal for European data link

Quality scoring

Dataset description

OS MasterMap Water Network Layer will become "end of life" on 31st March 2026. OS MasterMap Water Network Layer offers one of the world’s most detailed, heighted water networks – showing the flow and precise course of every river, stream, lake and canal in Great Britain. 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). Proximity is key. Organisations can understand water-related risks in detail, combining OS MasterMap Water Layer with OS MasterMap Topography Layer, property information and 3D height data for even richer insights. 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.

European data infrastructure with broad catalog discovery, free evaluation access and production-grade API options.

190K+

indexed dataset pages

countries and EU institutions

2019

API-first since

Free API quota

for evaluation and prototypes

SLA

history and push on production APIs

FAQ

Questions before production use

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