Flows, water levels and meteorological data

The amount of water in Québec’s rivers and reservoirs fluctuates continually, in particular during the spring flood. We have data collected by measuring instruments located on rivers and reservoirs throughout Québec and we’ve developed a tool to assist the general public in gaining access to that data. Please note that the tool is not designed to determine whether or not flooding will occur—only the Sécurité civile du Québec can determine and manage that type of risk.

How does the tool work?

The data is broken down based on measuring instrument.

  • First select the type of data you want—flows at facilities or in rivers, water levels or meteorological data.
  • Then select an administrative region.
  • Finally, select the location closest to the site for which you want information.

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Where does the data come from?

  • The data comes from Hydro-Québec measuring instruments set up at gauging and weather stations and also from gamma monitoring (GMON) sensors.
  • For more information, consult the open data set sheets

How often is the data updated?

  • Data is updated twice daily.
  • Sampling frequency varies based on the measuring instruments (the sampling interval can vary between 15 minutes and one day).
  • For more information, consult the open data set sheets.

How many days of data are displayed?

  • The temporal coverage is 10 days.

Why are certain rivers and reservoirs in Québec excluded from the tool?

  • Hydro-Québec only has measuring instruments on Québec rivers and reservoirs on which it operates generating stations and dams.

Why does certain data, such as water levels, show up twice?

  • At certain locations we have two sensors, a main sensor and a secondary sensor. This redundancy helps ensure data quality. When open data is released, the data collected by both sensors is visible.

Why is wind direction indicated in degrees rather than cardinal points?

  • Data collection methods are consistent with the standards of the World Meteorological Organization. Raw data cannot be modified prior to being made public. The main wind direction display does, however, combine data in degrees and in cardinal points, whereas the graph illustrating data from the previous 10 days shows raw data in degrees only.