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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180
Level of significance, or Significance level
The probability, in a statistical test, that the observed result might have occurred by chance. If the occurrence by chance is reduced to about 1 out of 100, this is referred to as the `0.01 or 1 per cent level of significance`. More generally, any difference that chance would cause to be exceeded with a probability of P is said to lie on the P `le.....
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181
Critical region - Significance level
The set of possible values of the statistic used such that, if the value of the statistic that results from the observed values belongs to the set, the null hypothesis will be rejected. Conversely, the null hypothesis will be accepted if the opposite is the case. Critical regions are determined in such a way that if the null hypothesis is true, the.....
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215
Confidence coefficient, or Confidence level
The measure of probability associated with a confidence interval is called `confidence coefficient` or `confidence level`......
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220
Acceptable quality level
The proportion of effective units in a batch that is regarded as desirable by the consumer of the batch, the compliment of the proportion is the defectives that he is willing to tolerate......
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439
Flow
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551
Flow
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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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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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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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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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