News and Events

Wateroffice Release 60 (2026-09-17)

The National Hydrological Service (NHS) is pleased to announce that Wateroffice Release 60 was published on September 17, 2026.

Website and Web Service Enhancements

• Add annual daily extreme data to the web service
• Update the graphing library for the real-time graphic page, as the current library is no longer supported. The other graphic pages will be updated in a future release
• Add quick graphing options for 1 day, 7 days, 1 month, 6 months, 12 months and 18 months on the real-time graphic page
• Expand the width of tabular pages to improve visibility and accessibility
• Enable station name searches with special characters
• Update the FAQ with ¿What are the published daily data symbols?¿
• Update the display of Gross and Effective Drainage Areas to two decimal places, where applicable
• Rename the labels on the Historical Hydrometric Data Download page to ensure consistency with the graphic page and tabular page
• Fix the issue with searching for French Operating Agencies

Last updated: 2026-09-18

HYDAT Release (2026-07-17)

The new release of HYDAT.mdb and Hydat.sqlite3 dated on July 17, 2026 is now available. Please use the following link to download the new versions (Hydat_mdb_20260717.zip & Hydat_sqlite3_20260717.zip): http://collaboration.cmc.ec.gc.ca/cmc/hydrometrics/www/ Both HYDAT.mdb and Hydat.sqlite3 can be used as standalone products.

Last updated: 2026-07-27

Unit Data (2011 - 2026, updated on 2026-05-11)

Provisional Unit Data (2011-2026) is available on the following site and was last updated on May 11, 2026.

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.

Last updated: 2026-07-08

Updated drainage areas for WSC hydrometric basins

Both the gross and effective drainage areas of WSC hydrometric basins have been updated based on the outputs of NHS hydrometric basin delineation project. Drainage areas are now reported to four significant figures with a maximum of two decimal places. About 2% of active stations and 7% of discontinued stations are excluded as they fall under situations that are difficult to delineate (e.g. irrigation canals, diversions, stations established before hydro developments, flow bifurcations, and stations in the ocean). Going forward, newly added or modified stations will be updated annually. NHS hydrometric basin delineations will be the only source of drainage areas for WSC hydrometric basins. Please refer to the documents for the station list with revised drainage areas and the procedures for non-contributing area calculation.

Last updated: 2026-04-09

Upcoming Enhancements to Network Change Communications

Network changes are a normal ongoing part of maintaining the National Hydrological Services' hydrometric network. To support greater transparency and provide opportunities for stakeholder feedback, station-level banners will be used on Wateroffice to share information about the proposed changes.

These banners will include communications on the following :

• Discontinuing station operation

• Reducing station operating schedules

• Reducing timeliness of real-time data

• Reducing available datasets or products

• Relocating the station

If you see a banner on a station that is important to your work, research, community, cultural or traditional practices, recreation, operations, or safety, we want to hear from you!

Click the Contact Us link in the banner to share how the proposed changes could impact you. Your feedback will help inform decisions and may contribute to sustaining critical stations.

Last updated: 2025-12-12

Datamart URL change (2025-10-07)

Effective October 7, 2025, MSC Datamart users must update their bookmark or script from: https://dd.weather.gc.ca/hydrometric/ to https://dd.weather.gc.ca/today/hydrometric/

Users who have already subscribed to the dd_info mailing list should have received multiple notifications about this Datamart structure change and are expected to have taken the necessary actions accordingly. For those who have not yet subscribed, it is strongly recommended that you do so to receive timely service notifications and important updates in the future.

You can subscribe using the following link.

Last updated: 2025-10-09

Auto-QAQC Pilot Launch (2025-06-02)

The National Hydrological Service (NHS) has launched a pilot to evaluate automated quality assurance and quality control (QA/QC) at a select number of stations (54). The pilot will assess how this automated QA/QC can improve the response time to data issues. Data will continue to require Technologist review and intervention when required. If you have any questions, please use our Contact Us page.

Last updated: 2025-08-14

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.

Last updated: 2025-08-14