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
55
Partial duration series above a given base
A list of all events, such as, floods, occurring above a selected base, without regard to the number within a given period. In the case of floods, the selected base is usually equal to the lowest annual flood, in order to include at least one flood, each year......
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342
Base units
The seven fundamental units of measurement upon which the International System of Units is based viz. Length (metre), weight mass (kilogram), time (second), electric current (ampere), thermodynamic temperature (kelvin), amount of substance (mole) and luminous intensity (candela)......
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350
Supplementary units
The SI units radian and steradian are called supplementary units. They are `dimensionless` derived units (more precisely, derived units of dimension one) with special names and symbols. Although the coherent unit for plane angle and for solid angle is expressed by the number 1, it is convenient to use the special names radian (rad) and steradian (s.....
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351
Derived units
Derived units are expressed algebraically in terms of base units. Their symbols are obtained by means of the mathematical signs of multiplication and division. The expression for the coherent derived units in terms of base units can be obtained from the dimensional products by using the following format substitution : L-->m, M-->kg, T-->s, I-->A, Q.....
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382
Non-SI units
There are certain units, recognized by the International Committee for Weights and Measures (CIPM) as having to be retained because of their practical importance (as given in the following tables)......
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577
British thermal units
img:equations//566_595_e.jpg
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578
British Thermal Units
img:equations//566_595_e.jpg
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579
British thermal units
img:equations//566_595_e.jpg
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917
Base flow, Basic flow, or Permanent flow
1 - The sustained or dry weather flow of streams resulting from the outflow of permanent or perched groundwater, and from the drainage of large lakes and swamps. Also water from glaciers, snow and all other possible sources not resulting from direct runoff. 2 – The discharge of a surface channel when the soil in its catchment area is in a conditi.....
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1762
Base
1 - A compound capable of reacting with acids to form salts, either with or without the elimination of water. With reference to exchangeable or absorbed bases, the elements sodium, potassium, calcium and magnesium are considered bases rather than the oxides or hydroxides of these elements. 2 - See 4892 and 5766......
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1770
Exchange capacity, Cation exchange capacity, Base exchange capacity, or Saturation capacity
The total cation exchange, usually expressed as milliequivalents per 100 grams. Measured value of cation exchange capacity depends somewhat on the method used for the determination......
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1772
Base saturation
Exchange capacity saturated with metallic cations of pH 7 or over.
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1775
Depletion of bases
Removal of exchangeable cations after displacement by H+.
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2439
Maximum base width
Horizontal distance between the outer points of the heel and toe of the cross section of a dam or spillway.
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3547
Base of the notch, or Sill of the notch
The bottom horizontal surface of the notch.
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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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5766
Base
1 - The main constituent of paint that supplies body, or opacity to obscure the surface. 2 - See 1762 and 4892.
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6442
Base level of erosion
The lowest level to which a stream can erode its bed.
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6523
Broad-base terrace
A low embankment or ridge with gently sloping sides, rounded crown, and a broad shallow channel along the upper side, constructed to control erosion by diverting runoff along the contour at low velocity instead of permitting it to rush down the slope. It may be level or have a grade toward one or both ends......
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6524
Narrow-base terrace
A terrace similar to a broad-base terrace in all respects excepting the width of ridge and channel.
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7105
Baseline concentration
The ambient concentration level of a pollutant.
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7134
Alkali or Base
A substance that, when dissolved in water, has the capacity to neutralize acids.
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7506
Baseline profile, or Baseline study
A survey of the environmental conditions and organisms existing in a region prior to unnatural disturbances.
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7669
Base cations
Certain cations in the soil that are also plant nutrients.
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7670
Base exchange capacity
A measure of the absorptive capacity of a soil for bases or exchangeable ions (OH).
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