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
79
Mass diagram, Mass curve, Flow integrated curve, or Summation curve
A diagram, curve, or graph, plotted with rectangular coordinates, representing a summation (integration) of all preceding quantities up to a point. Each ordinate being equal to the sum of preceding terms in the series, with the corresponding abscissa representing elapsed time, etc. The diagram is used extensively in storage and regulation studies p.....
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80
Residual mass diagram or Residual mass curve
A diagram or graph plotted with rectangular coordinates, each ordinate being equal to (i) the summation of all preceding quantities up to a given point, minus (ii) the arithmetical mean of the series times the number of quantities in the series up to the given point, with the corresponding abscissa representing time, number of the item in the serie.....
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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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366
Density, or Mass density
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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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406
Mass
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408
Mass
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410
Unified atomic mass unit
The unified atomic mass unit is equal to 1/12 of the mass of an atom of the nuclide 12C.
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422
Mass
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423
Volumic mass, Density, Mass density
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424
Lineic mass, Linear density
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442
Mass defect
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444
Mass activity, Specific activity
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546
Mass
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577
British thermal units
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578
British Thermal Units
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579
British thermal units
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762
Precipitation mass curve
Graph showing accumulated precipitation against time.
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807
Mass rainfall curve, or Mass precipitation curve
A plot of accumulated precipitation against time.
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808
Residual mass rainfall curve
A plotting of the year-to-year residual departures of rainfall from the arithmetic average accumulated for the period under consideration......
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863
Residual mass curve
A plotting of the year-to-year residual departure of rainfall or runoff from the arithmetical average accumulated for the period under consideration......
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910
Coefficient of permeability, Hydraulic conductivity, Coefficient of conductivity, Unit of permeability, Transmission constant, Coefficient of transmission
1   The rate at which groundwater flows through a soil in response to a given hydraulic head. 2   The rate of flow of a fluid through a unit cross section of a porous mass under a unit hydraulic gradient, at a specified temperature. 3 - See 6497......
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923
Unit hydrograph, or Unit graph (USA)
Hydrograph of direct runoff resulting from a unit amount of effective rainfall generated uniformly over a watershed during a specified duration......
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