Open Government Portal

As we launch this enhanced integrated Open Government Portal search, you may notice that there has been a reduction in the number of open information records. Please note that you can still access the publications that no longer appear here by visiting: Government of Canada Publications and Library and Archives Canada. If you have any comments or questions contact us!

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16 records found
  • Current Water Levels, 2008

    The map shows 3172 hydrometric stations, 1491 active and 1681 inactive, located on rivers and lakes across the country. All the stations on the map are situated in a drainage area of 200 square kilometres or more. For 1200 stations shown on the map, surface water level measurements are recorded...
    Organization:
    Natural Resources Canada
    Resource Formats:
    • JP2
    • ZIP
    • other
  • Water balance - derived precipitation and evapotranspiration

    The map shows isolines for the annual precipitation and the annual evapotranspiration (in millimetres). Water is normally supplied by precipitation and lost through the processes of evapotranspiration and runoff or it may remain as surface or subsurface storage. Over long periods, generally...
    Organization:
    Natural Resources Canada
    Resource Formats:
    • JPG
    • PDF
  • The hydrologic cycle

    Hydrology is the science concerned with the occurrence and distribution of water on and under the earth. Meteorology is the science dealing with the atmosphere and the movement of water, both as vapour and as liquid, in the air. Both sciences are concerned with the hydrologic cycle - the...
    Organization:
    Natural Resources Canada
    Resource Formats:
    • JPG
    • PDF
  • Annual snowfall

    The map shows the annual snowfall (in centimetres) based on the 30-year period 1941-1970. Snowfall is measured by inserting a ruler into the new snow at several points to obtain its depth and to estimate the degree of drifting or scouring that has occurred. The water equivalent of snowfall for...
    Organization:
    Natural Resources Canada
    Resource Formats:
    • JPG
    • PDF
  • Annual precipitation

    Precipitation is derived from water vapour in the air, and it includes all forms of moisture falling on the earth's surface. Condensed water vapour accumulates in clouds, and precipitation occurs when the constituent ice crystals or water droplets grow too large to resist gravitational attraction...
    Organization:
    Natural Resources Canada
    Resource Formats:
    • JPG
    • PDF
  • Snow cover measurement networks

    The map shows the location of the snow course stations and the agencies that operate them. Most Canadian snow courses are operated by the federal Department of Fisheries and the Environment and the provincial government departments concerned with water resources. Though the principles of snow...
    Organization:
    Natural Resources Canada
    Resource Formats:
    • JPG
    • PDF
  • Mean Annual Total Precipitation

    Contained within the 3rd Edition (1957) of the Atlas of Canada is a plate that shows two maps for the annual total precipitation. Annual precipitation is defined as the sum of rainfall and the assumed water equivalent of snowfall for a given year. A specific gravity of 0.1 for freshly fallen snow...
    Organization:
    Natural Resources Canada
    Resource Formats:
    • JPG
    • PDF
  • The Potential of Soils and Bedrock to Reduce the Acidity of Atmospheric Depos...

    Contained within the 5th Edition (1978 to 1995) of the National Atlas of Canada is a map that shows vulnerability of soils and bedrock to acid precipitation using low, moderate and high sensitivity classes. The table covers sensitivity of water areas and the small map shows pattern of sulphate...
    Organization:
    Natural Resources Canada
    Resource Formats:
    • JPG
    • PDF
  • Potential Evapotranspiration

    Contained within the 4th Edition (1974) of the Atlas of Canada is a set of three maps relating the effects and dependency of vegetation on environmental variables. One map shows the average annual potential evapotranspiration in inches from ground and plant surfaces for areas where there is a...
    Organization:
    Natural Resources Canada
    Resource Formats:
    • PDF
    • JPG
  • Mean maximum depth of snow and time of occurrence

    The map shows the mean maximum depth of snow in centimetres, the standard deviation of the mean maximum depth of snow, and the mean date of mean maximum depth of snow. The information shown on the map is compiled from 1961 – 1970 snow course data in conjunction with 1955 – 1972 snow depth data....
    Organization:
    Natural Resources Canada
    Resource Formats:
    • JPG
    • PDF
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