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
67
Frequency curve
The graphical representation of the frequency of occurrence of specific events, or a continuous frequency distribution, the variate being the abscissa and the frequency the ordinate......
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68
Cumulative distribution curve, Distribution curve, or Ogive
A graphic plot of the cumulative frequencies for a particular class interval and of all lower class intervals below it (or of all upper class intervals above it) against the class interval concerned. See 864......
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69
Cumulative frequency function curve
Cumulative frequencies divided by the total number of observations, gives the relative cumulative frequency distribution and its plotting against the class interval concerned gives the cumulative frequency function curve......
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72
Lorenz curve
The degree of inequality in a distribution series is sometimes depicted by a Lorenz curve. The percentage cumulative observations are plotted against the percentage cumulative frequencies. In addition, a diagonal is drawn from the origin to the point of 100 per cent frequency - 100 per cent observations to represent the extreme condition of a compl.....
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74
Duration curve
A curve that expresses the relation of all the units of some item (e.g. flow), arranged in order of magnitude as the ordinate, and time (frequently expressed in percentage) as the abscissa; a graphical representation of the number of times given quantities are equalled or exceeded during a certain period of record. The duration curve is the integra.....
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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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76
Envelope curve
A smooth curve covering either all peak values or all trough values of certain quantities (e.g. rainfall, runoff), plotted against other factors, such as area, time. In general, none of the peak values go above the curve in the former case, called the `maximum envelope curve`, and when none of the minimum points falls below the curve is called the .....
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77
Flow-duration curve
A duration curve of stream flow.
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78
Probability curve
A curve that expresses the relation of the cumulative frequency of occurrence of a given event, based on an extended record of past occurrences. The curve is usually plotted with specially prepared coordinate paper, with ordinates representing magnitude equal to or less than the event, and abscissa representing probability, time or other units of i.....
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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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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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82
Curve fitting
1 - The fitting of a mathematical curve to any statistical data, e.g. regression data or time series. 2 - The fitting of a mathematically specified frequency curve to a frequency distribution observed......
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188
Operating-characteristic curve, or OC curve
A curve relating the probability of the same decision (i.e. in the acceptance of an incorrect null hypothesis) to various alternative values of the parameter is called the `operating-characteristic curve`, usually abbreviated to `OC curve`. The OC curve shows how the test or decision procedure operates, regardless of whether that operation is corre.....
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222
Operating characteristic in quality control, or OC curve in quality control
A curve showing the probability that a lot (or process) level of a quality would be accepted (or said to be in control), assuming the specified sampling plan is in use, plotted against the possible lot or process qualities. This curve is completely analogous to the operating-characteristic curve (or OC curve) for deciding on null hypothesis (See 18.....
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247
Regression curve
A graphical representation of the correspondence between each value of x of the variate X and a central value y(x) of the variate Y in the case of two variates X and Y. The correspondence is not necessarily linear. See also 248......
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364
Speed, or Velocity
img:equations//362_368_e.jpg
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417
Angular velocity
img:equations//415_417_e.jpg
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418
Velocity
img:equations//418_421_e.jpg
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548
Velocity
img:equations//547-548_e.jpg
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762
Precipitation mass curve
Graph showing accumulated precipitation against time.
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778
Rainfall intensity curve
A curve which expresses relation of the intensities to their duration.
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805
Depth-duration curve, or Rainfall intensity-duration curve
A curve showing the relationship between the average intensity of the rainfall of a storm and the duration of the storm.
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806
Depth-area curve, or Rainfall intensity-area curve
A curve showing the relationship between the average intensity of the rainfall of a storm and the area of the storm.
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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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