International Commission on Irrigation & Drainage Commission Interationale des Irrigation et du Drainage

Multilingual Technical Dictionary (MTD)
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Term No.Term Name/Term DescriptionAction
796
Totalizer, or Storage rain gauge
A type of rain gauge which totalizes the quantity of precipitation.
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810
Snow
Precipitation composed of white or translucent ice crystals, chiefly in complex branched hexagonal form and often agglomerated into snowflakes......
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811
Snowfall
Snow that reaches the earth`s surface. It may be expressed in unit of depth accumulated on earth`s surface, or as depth of equivalent amount of water. The definition may be broadened to include hail, sleet or other precipitation occurring in solid form......
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813
Density of snow, or Snow density
The ratio, expressed as a percentage of the volume of water resulting from the melting of a given quantity of snow to the volume of snow. When a snow sampler is used, it is the ratio, expressed as a percentage of the scale reading on the sampler to the length of the snow core or sample......
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814
Snowmelt, or Snow water
The water resulting from the melting of snow. It may evaporate, seep into the ground, or become a part of runoff.
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815
Water-equivalent of snow, Snow water equivalent
The depth of water that would result from the melting of the snow cover over a given area.
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816
Effective snowmelt
Part of the snow melt that reaches the channels of streams as runoff.
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817
Snowmelt rate
The rate of conversion of snow into water within a snow pack.
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818
Snow storage
Storage of water on a drainage basin in the form of snow and ice.
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819
Snowline, or Snow limit
Elevation to which continuous snow cover of high mountains retreats in summer.
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820
Permanent snowline
The line of lowest elevation or the lower limit of a snow-field at any locality on the earth`s surface above which snow accumulates and remains on the ground throughout the entire year......
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821
Semipermanent snowline
The line of lowest elevation or the lower limit of a snow-field at any locality on the earth`s surface above which snow accumulates and remains on the ground continuously for a considerable portion of the year......
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822
Snowfield
An unbroken expanse of snow.
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823
Snow survey
Determination of the depth, water content and density of snow at selected points on a drainage basin, to ascertain the amount of water stored there in the form of snow and to provide a basis for estimating water yield when the snow melts......
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824
Snow sample
A core taken from a snow mantle by means of a snow sampler, from which the depth and density and equivalent water content may be determined......
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825
Snow sampler
An apparatus for measuring snow depth and density.
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826
Snow gauge
An instrument for measuring depth of snow that falls at a given place and time.
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827
Snowbin
A box used to measure the depth of snowfall. A type of snow gauge.
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828
Snowboard
A device to measure the depth of snowfall. One type consists of a flat, white board on which snow depth is measured directly as it is caught. Another type consists of a vertical board with depth calibrations in large, legible numbers which allow snow depth to be read from a distance, as perhaps from an air plane......
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829
Snow course
A traverse across a snow area established for use in snow surveying.
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831
Snowdrift, Snow wreaths, Snow drift, Drift-snow
A bank of snow which tends to collect in sheltered places when snow falls in strong wind. Drifts may also be formed when no snow is falling by the action of wind on the fallen snow; snow carried in this way is called `drift-snow`......
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832
Snow mushrooms, or Snow bosses
The accumulated snow on the tops of tree stumps and posts.
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833
Snow tremor
Sudden settling of an area of snow by an appreciable depth.
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836
Snow-broth
A term applied to snow and water mixed, or to snow just melted.
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837
Ripening of snow, Over-ripening of snow
The process of snow crystals tending to become granular with spaces between the crystals filling with water, and the snow water content tending to become uniform at all depths. When the snow becomes still more dense and begins to lose water, it is some times referred to as `over-ripe`.....
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