October 2025

This release note provides information about the October 2025 release of OS MasterMap Water Network Layer.

Feature counts

Feature Type
Count

WatercourseLink

4 861 007

HydroNode

4 875 314

Errors

Error Type
Count

Links with spikes

0

Single link loops

48

Multi-link circular flow loops that include River Links

4

Multi-link circular flow loops on Drains

29

Product improvements

Details of live and resolved data issues for the OS MasterMap Water Layer product will be communicated on the OS MasterMap Water Network Layer Known Data Issues page. This page will provide details of their impacts and updates on the expected time frame for their resolution.

Notices

OS MasterMap Water Network Layer product will soon become End of Life

Next release

The next release of OS MasterMap Water Network Layer is scheduled for January 2025.

The January 2026 release will be the final release of OS MasterMap Water Network Layer.

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