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
36
Law of large numbers
The larger the samples, the less will be the variability in the sample averages and probability of occurrences. The law of large numbers works by its swamping effect rather than by compensation. By the law of large numbers, the average of a large number of independent measurements will be more precise and, therefore, have more reliability than a si.....
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61
Weight
The importance of an object in relation to a set of objects to which it belongs; a numerical coefficient attached to an observation (frequently by multiplication) in order that it assumes the desired degree of importance in a function of all observations of the set......
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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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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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85
Weighting
A statistical method of adjusting the results of observations by taking into consideration the fact that not all the data may be of equal reliability or importance......
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86
Weighting coefficient
The coefficient attached to an observation as its weight in a procedure involving weighting.
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113
Weighted average, or Weighted mean
An average of quantities that attaches a series of weights to it in order to make proper allowance for their relative importance. A value obtained by multiplying each of a series of values by its assigned weight and dividing the sum of those products by the sum of the weights. For example, a weighted arithmetic mean of x1, x2 ... xn with weights w1.....
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153
Distribution, Weibull, or Type III extreme value distribution
The probability distribution of a continuous random variable x, the distribution function of which is :
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164
Law of frequency of errors, or Law of errors
One aspect of the normal distribution that enjoins that whenever a large sample is marshalled in the order of its magnitude, the frequency distribution of errors follows the `normal distribution`......
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173
Skewness
A term denoting asymmetry in a frequency distribution. A measure or index of the relative lack of symmetry of a frequency distribution generally given by .....
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187
Power of the test
The probability that an incorrect null hypothesis is rejected.
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189
Power function
The inverse of the performance function is the `power function` that relates the probability of rejecting an incorrect null hypothesis to various alternative values of the parameter. The power function can be drawn either by using the information about the `power of the test` (see 187)......
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193
Two-sided test, or Two-tail test
A test of a hypothesis when the regions of rejection are located at both ends of the distribution of the test statistic.
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286
Working drawing
A drawing that gives all the information, details and dimensions, necessary for the complete construction or manufacture of the object represented......
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287
Assembly drawing
A drawing of the structure or machine put together, showing the relative positions of the different parts.
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288
Design drawing
The drawing layout whereon the scheming, planning and designing are accurately worked out, after the general ideas have been determined by freehand sketches and calculations......
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289
Outline assembly drawing
A drawing to give a general idea of a structure or machine and containing only the principal dimensions.
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290
Detail drawing, or Detailing
The drawing of a separate piece or component of a structure or machine, giving a complete and exact description of its form, dimensions and construction......
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291
Tabular drawing
The drawing, either assembly or detail, where the dimension lines are given reference letters and an accompanying table on the drawing lists the corresponding dimensions for a series of sizes of the structural parts or the machine parts, thus making one drawing serve the range covered......
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310
Multiview projection, or Multiplanar projection
A method of projection that shows the exact shape of an object can be represented by two or more separate views produced on projection planes that are usually at right angles to each other......
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315
Angular perspective, or Two-point perspective
Perspective where some of the principal lines are oblique and some are not.
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354
Power (W)
It is one joule per second. Unit of power is watt.
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358
Electric resistance (W )
It is the resistance between two points of a conductor when a constant difference of potential of one volt, applied between these two points, produces a current of one ampere in this conductor, this conductor not being the source of any electromotive force. Unit of electric resistance is ohm......
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371
Energy, Work, Quanitity of heat
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