April 2025

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

Feature counts

Feature Type
Count

WatercourseLink

4 733 541

HydroNode

4 752 874

Errors

Error Type
Count

Links with spikes

1

Single link loops

44

Multi-link circular flow loops that include River links

4

Multi-link circular flow loops on Drains

25

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.

Next release

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

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