News and Events

National Hydrometric Network Basin Polygons

NHS is pleased to announce the preliminary release of a new dataset of drainage basin polygons. The GIS dataset contains the watershed boundaries for over 6000 of the 7896 active and discontinued hydrometric stations across Canada. New stations will continue to be added over the coming months. Further information is available at: https://collaboration.cmc.ec.gc.ca/cmc/hydrometrics/www/HydrometricNetworkBasinPolygons/

Wateroffice Release

The National Hydrological Service of Canada (NHS) is pleased to announce that the Wateroffice release 55 was published on March 10, 2025.

This release includes an operating system migration to Ubuntu 22.04 and introduces key updates to the labelling of Grades and Qualifiers.

Below are the specific changes to the Wateroffice web site and web service:

• Wateroffice real-time graphic page: Add a new label named Grade; Rename Qualifier to Qualifiers

• Wateroffice real-time tabular view: Add a new column titled Grade; Rename Qualifier to Qualifiers; Expand the width of the table to fit all the columns, applying only to a big screen

• Wateroffice real-time download file: Add a new column titled Grade; Rename Qualifier to Qualifiers

• Web service: Add two new columns, titled Grade and Qualifiers at the end of the web service download file.

Please note that approximately six months after the two new columns are introduced, the existing Qualifier and Symbol columns will be removed from the web service download file. Web service users are advised to update their scripts during this transition period.

If you have any questions, please send an email to the Data Dissemination Unit: shn-dissemination-nhs-dissemination@ec.gc.ca.

Unit Data (2011 - 2025)

Provisional Unit Data (2011-2025) is available on the following site and was last updated on March 11, 2025.

Please review the header (first line of the file) to confirm the creation date of each file.

https://collaboration.cmc.ec.gc.ca/cmc/hydrometrics/www/UnitValueData

Subsequent quality assurance and verification procedures may result in differences between what is currently available and what will become official record.

Real-time data continues to be updated to ensure the highest quality approval status, and are available on the Wateroffice website for up to 18 months.

HYDAT Release

The new releases of the HYDAT.mdb and Hydat.sqlite3 dated on January 17, 2025 are now available.

Height Modernization Status

NHS is currently acquiring the GNSS data required to provide conversion factors to the datum CGVD2013 epoch 2010. Conversion factors will be published on WaterOffice as they become available. Thank you for your patience as we modernize our systems.