January 2025

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

Feature counts

Feature Type	Count
WatercourseLink	4 717 167
HydroNode	4 741 284

Errors

Error Type	Count
Links with spikes	0
Single link loops	40
Multi-link circular flow loops that include River links	3
Multi-link circular flow loops on Drains	19

Product Updates

Tiles containing no data are no longer published.

From the next release, known data issues will no longer be outlined in the release note for this product. Details of live and resolved data issues will instead be published on the OS MasterMap Water Network Layer Known Data Issues page. The release note for this product will continue to publish feature counts and source data dates only.

Next release

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