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10 records found
  • Federal

    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
  • Federal

    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
  • Federal

    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
  • Federal

    Mean annual lake evaporation

    The map represents the mean value (in millimetres) of the annual loss of water through the evaporation process from the surfaces of open water bodies, such as ponds and shallow lakes and reservoirs based on the 10-year period 1957 to 1966. The greatest mean annual lake evaporation (more than 900...
    Organization:
    Natural Resources Canada
    Resource Formats:
    • JPG
    • PDF
  • Federal

    Humidity and Fog

    Contained within the 3rd Edition (1957) of the Atlas of Canada is six maps that show the humidity and fog occurrences across Canada. Two maps on the top that show the mean mixing ratios for January and July, respectively. Mixing ratio is defined as the ratio of the mass of the water vapor to the...
    Organization:
    Natural Resources Canada
    Resource Formats:
    • JPG
    • PDF
  • Federal

    Ice

    Contained within the 4th Edition (1974) of the Atlas of Canada is a set of six maps that shows different types of ice accumulation.
    Organization:
    Natural Resources Canada
    Resource Formats:
    • PDF
    • JPG
  • Federal

    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
  • Federal

    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
  • Federal

    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
  • Federal

    Winds

    The plate contains four maps: Annual Winds, March Winds, August Winds and Annual Maximum Wind Speed. For each of the first three maps the frequency of wind, the mean speed of wind, and the frequency of calms are shown. On all three maps the frequency scale is 1 millimetre equals 2 percent. These...
    Organization:
    Natural Resources Canada
    Resource Formats:
    • JPG
    • PDF
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