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
323
Hydrographic maps
Maps showing information concerning bodies of water, as shore lines, sounding depths, subaqueous contours, navigation aids and water control measures......
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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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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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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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688
Hydrography
Science dealing with ’sounding, charting and mapping open bodies of water for navigational purposes, analyzing and describing their forms and positions, and determining magnitude and direction of winds, tides, and currents......
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689
Orohydrography
The branch of hydrography which deals with the relations of topography to drainage.
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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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916
Hydrograph
A graph showing the stage, discharge, velocity, or some other feature of water, with respect to time. For example, a graph showing the discharge of a stream against a time is called ‘discharge hydrograph’. A graph of sediment concentration or sediment load with respect to time is a ‘sediment hydrograph’......
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918
Recession, Recession hydrograph
The falling limb of a hydrograph after a flood event representing the withdrawal of water from storage in the valley, stream channel and the subsurface runoff. A recession curve may sometimes be referred to as a ‘recession hydrograph’......
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920
Compound hydrograph, or Compound normal hydrograph
The hydrograph of an overlapping storm when the flow on account of one sub-storm continues during the next sub-storm.
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921
Design flood hydrograph, Inflow Design Flood
The hydrograph of flow adopted to represent limiting volumes and concentration of runoff for use in determining design capacities of spillways for dams, etc., or other hydraulic studies......
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922
Hydrograph separation
The division of a hydrograph that results from a specific storm into its groundwater and direct runoff components.
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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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928
S-curve, or S-curve hydrograph
A graph showing the summation of the ordinates of a series of unit hydrographs spaced at unit-rainfall duration intervals. It represents the hydrograph of unit rate of rainfall excess continued indefinitely. If the ordinates of the S-curve are expressed as a percentage of the total unit hydrograph volume and the abscissa as unit of time or as perce.....
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929
Synthetic unit hydrograph
A unit hydrograph developed on the basis of an estimation of coefficients expressing various physical features of a catchment......
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941
Auto-regressive scheme, Synthetic time series
Simple and widely used model for the generation of synthetic time series. In this model, the current values of the series are expressed as a function of the preceding values and a random component......
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1958
Baule unit
Named after the scientist Baule, a unit of growth factor that will produce 50 per cent of the maximum possible yield or yield-producing capacity......
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2578
Unit column method (for buttress dam)
It is a method of designing a buttress dam evolved by Herman Shorer. It is assumed that the buttress comprises a series of hypothetical curved struts that transmit the water load to the foundations by uniform axial compression without interaction between struts. The axes of the curved struts are analogous to trajectories of first principle stress i.....
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2609
Unit seepage force
The measure of seepage force, equivalent to the product of the hydraulic gradient and the unit weight of water (or other fluid)......
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2661
Dry unit weight, or Unit dry weight
The weight of soil-solids per unit of volume (total) of soil mass.
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