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
14
Datum
1 - Any graphical numerical or geometrical quantity or set of such quantities that may serve as a reference or base for other quantities. 2 - See 2071 and 3306......
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237
Line chart
A graphical representation of bivariate frequency distribution in which successive plots of two variates are connected by lines......
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244
Least square line
A relationship between variates obtained by minimizing the mean-squared vertical deviations from the `regression line` where the regression between the variates is linear......
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246
Regression line
A graphical representation of a linear 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. See also 248 and 249......
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249
Linear regression
Regression where the relationship is of the first degree of the independent variable.
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252
Curvilinear regression or non-linear regression
A regression which is not linear.
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270
Linear trend, or Rectilinear trend
A trend when the value is a linear function of the time variable, e.g. u (t ) = a + b (t ), where a and b are constants.
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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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305
Outline sectioning
Shading, stipling, hatching or otherwise emphasizing the section outlined only of very large surface.
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313
Linear perspective
Perspective projection by means of which a true picture of an object is reduced upon a surface anywhere in space from the actual dimensions of the object, as given in a suitably chosen orthographic projection......
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318
Panoramic perspective, Curvilinear perspective, or Cylindri-cal perspec-tive
Perspective when the picture is made on a concave cylindrical surface as in a panorama.
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327
Rectilinear chart, or Grid chart
Chart made on a sheet, ruled with equi-spaced horizontal lines, crossing equi-spaced vertical lines.
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331
Trilinear chart, or Triaxial diagram
Chart for studying the properties of chemical compounds consisting of three elements, alloys of three metals, or compounds and mixture containing three variables. The chart has the form of an equilateral triangle the altitude where represents 100 per cent of each of the three constituents......
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424
Lineic mass, Linear density
img:equations//422_426_e.jpg
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706
Isotherm, or Isothermal line
A line on a chart joining points of equal or constant temperature.
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802
Isohyet, Isohyetose, Isohyetal line, or Isopluvial line
1 - A line connecting points of equal rainfall depth.2 - A line on a chart joining points of equal precipitation over a specified time period or for a given storm......
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819
Snowline, or Snow limit
Elevation to which continuous snow cover of high mountains retreats in summer.
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820
Permanent snowline
The line of lowest elevation or the lower limit of a snow-field at any locality on the earth`s surface above which snow accumulates and remains on the ground throughout the entire year......
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821
Semipermanent snowline
The line of lowest elevation or the lower limit of a snow-field at any locality on the earth`s surface above which snow accumulates and remains on the ground continuously for a considerable portion of the year......
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1040
Isopiestic line, or Pressure surface contour
Contour drawn on the piezometric surface of an artesian aquifer.
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1072
Phreatic decline, or Decline of water table
The downward movement of the water table.
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1153
Springline
Springs marking the lower margin of an outcropping aquifer that occur in a distinct zone across the landscape.
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1178
Gauge datum
The elevation of the zero of a staff gauge or other indicator of water depth above a certain reference level.
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1182
Gauge line
The line across a channel passing through a given gauge.
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1183
Gauge line pillars
The structural landmarks fixing the position of the gauge line.
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