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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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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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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5380
Hydrograph
1 - A graph showing variations of flow with respect to time. 2 - A graph showing variations of water level with respect to time......
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7911
Design flood hydrograph
The flood hydrograph adopted to represent limiting volumes and concentration of runoff for use in determining design capacities of spillways for dams, etc., or other hydraulic structures......
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7932
Flood hydrograph
A graph showing the stage, discharge, velocity, or some other parameter related to water, with respect to time. For example, a graph showing the discharge of a stream against the time is called `discharge hydrograph`. A graph of sediment concentration or sediment charge with respect to time is `sediment hydrograph`. Other examples of hydrographs ar.....
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