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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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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2040
Tidal datum
A datum defined by a phase of the tide.
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2071
Datum, Plane
1 - The horizontal plane to which soundings and ground elevations of water surface elevations are referred. The plane is called a tidal datum when defined by a certain phase of the tide. 2 - See 14 and 3306......
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2748
Standard crest shape, or Datum shape
The shape of a spillway cross section that corresponds to or coincides with the natural (basic) profile of the lower nappe surface for the design discharge. .....
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3306
Datum
1 - An arbitrary horizontal line from which heights and depths are reckoned, as in a longitudinal section of a canal or railroad. 2 - See 14 and 2071......
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5082
Datum line
An arbitrary horizontal line from which heights and depths are measured.
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