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37 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
  • Lakes, Rivers and Glaciers

    Contained within the 4th Edition (1974) of the Atlas of Canada is a map that shows the lakes, rivers and glaciers as well as the major drainage areas. Provincial and territorial boundaries are shown, but otherwise there are no other names or symbols shown on the Canadian land surface.
    Organization:
    Natural Resources Canada
    Resource Formats:
    • PDF
    • JPG
  • 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
  • Drainage Basins

    Contained within the 4th Edition (1974) of the Atlas of Canada is a map that shows drainage basins as well as major lakes and diversions. The map displays the ocean drainage areas along with component river basins and diversion areas for the Arctic, Pacific, Hudson Bay and Atlantic drainage areas.
    Organization:
    Natural Resources Canada
    Resource Formats:
    • PDF
    • JPG
  • 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
  • River Profiles

    Contained within the 4th Edition (1974) of the Atlas of Canada is a map that shows the location of river profiles. There are drainage profiles, major river systems and major tributary included in this map.
    Organization:
    Natural Resources Canada
    Resource Formats:
    • PDF
    • JPG
  • River systems of Canada

    The map shows the location of rivers, glaciers and the six physiographic regions of Canada. Rivers serve as the natural drainage channels for surface waters. The network formed by river systems receives water from two main sources: runoff and base flow. Runoff is that part of precipitation which...
    Organization:
    Natural Resources Canada
    Resource Formats:
    • JPG
    • PDF
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