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
75
Duration-area curve of flows
A curve that shows the area beneath a duration curve and value of the flow, and is, thus an integral of duration with respect to stream flow. When the duration curve is plotted as a percentage of time, the resulting duration area shows the average flow available below a given discharge......
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77
Flow-duration curve
A duration curve of stream flow.
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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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439
Flow
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551
Flow
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597
Head of water in metres
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598
Head of water in metres
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628
Kilowatt
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629
Kilowatt hours
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630
Kilowatt hours
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631
Kilowatt hours
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632
Kilowatt hours
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633
Kilowatt hours
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634
Kilowatt hours
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729
Headwater, or Headwaters
The upper reaches of a stream near its source.
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732
Dry weather flow
The flow of water in a stream during the non-rainy season. (See also ‘Base flow’).
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733
Regeneration flow, or Return flow
Water, that has been diverted from a body of surface water for irrigation purposes, passing downwards through the soil to groundwater, and ultimately reaching the same or another body of surface water to the subsoil water table......
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767
Depression, Low, or Trough
Area of low pressure generally surrounded by closed isobars, usually associated with storm and rain; winds blow around the depression counterclockwise in the northern hemisphere and clockwise in the southern hemisphere......
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854
Interflow, Subsurface runoff
That portion of the precipitation which has not passed down the water table but is discharged from the area as subsurface flow into stream channels. Also known as ‘subsurface runoff’ (illustrated)......
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855
Subsurface flow, or Underground flow
The phenomenon of water flowing beneath the earth`s surface.
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857
Streamflow
Discharge flowing in a natural open channel.
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873
Infiltration head
The depth of water on the surface porous media which causes infiltration.
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906
Return flow
Excess irrigation water returned to the stream after water application on a crop.
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907
Divertible return flow
Water returning to the river below a dam in the form of either groundwater seepage or irrigation runoff that would increase the river flow above the normal or historical amount and could be diverted into ditches with head gates below the dam. .....
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913
Hydraulic head
1  The energy at a given point in a liquid, expressed as the equivalent height of a column of the liquid above a given datum. 2   See 1830, 5258 and 6491......
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