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
130
Degrees of freedom
The degrees of freedom of a set of observations (ex- hypothesis are subject to sampling variation) is the number of independent values in the sample that could be assigned at will within the specification of the system......
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1653
Degree of dispersion
Extent to which soil aggregates are broken down to primary particles by any given treatment.
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1665
Degree of aggregation
Measure of the proportion in which aggregates are present.
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1720
Degree of aeration, or Air space ratio
Ratio between the volume of air and the volume occupied by the voids.
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1774
Degree of saturation (V)
Percentage ratio of exchangeable cations exclusive of H+ (= S ) to total exchangeable cations inclusive of H+ (= T ), i.e.  .....
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1802
Degree of saturation
1 - Ratio between the volume of water and the volume of voids. 2 - See 1774.
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2010
Solar day
The interval between two successive transits of the sun`s centre over the same meridian.
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2011
Lunar day
The interval between two successive transits of the moon`s centre over the same meridian.
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2012
Tide day
The interval between the arrival of any two consecutive high waters of the direct tide (or of the opposite tide) at any given place, its average length being 24 hours 51 minutes......
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2154
Degree of salinity
Percentage of soluble salts in the root zones.
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3842
Straight (line, surface) sharp cut-water, Equilateral cut-water, or Sixty degree straight sharp cut-water
A sharp cut-water formed by two straight surfaces meeting at a line. Since the two straight sides of the cut-water and the width of the pier form a triangle, it is, sometimes, classified according to triangle properties (viz. equilateral cut-water) and also according to the value of the nose angle (as 60o straight sharp cut-water)......
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4892
Base, Base period, or Base days
The number of days over which duty is reckoned, determined or measured. Generally base period equals the period between first and last irrigation to raise a crop......
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4906
Day-degree, or Degree day
Variation of one degree per day in mean daily temperature, above an adopted standard reference temperature (usually 10oC). The number of degree days for a single day is the actual variation of mean temperature from the standard. The number of degree days is a month, or other interval, is the sum of daily values. When the mean temperature on a given.....
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4955
Daylength
Number of hours between sunrise and sunset.
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5031
Degree of durability of irrigation
The annual rate of variation in the depth of the groundwater level.
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5044
Degree of drainage
A qualitative measure of the efficacy of a drainage system in an area.
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8981
Degree estimate
A guess estimate based on studies from index maps, and not on thumb rules, but on experience of cost of previous work of the same type built elsewhere......
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9015
Force account system, Day-labour system, Day-work system, or Hired labour system
Management and supervision of the construction work directly by the entrepreneurial agency.
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