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
192
One-sided test, One-tail test, or Single tail test
A test of a hypothesis when the region of rejection is wholly located at one end of the distribution of the test statistic, e.g. when the alternative hypothesis specifies values only to one side of the null hypothesis. The one-tail test may be described more precisely as either a `lower-tail test` or an `upper-tail test`......
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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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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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303
Detailed section, or Removed section
A section similar to a revolved section, except that it does not appear on an external view but instead is drawn out of place and appears adjacent to it......
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597
Head of water in metres
img:equations//596_630_e.jpg
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598
Head of water in metres
img:equations//596_630_e.jpg
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729
Headwater, or Headwaters
The upper reaches of a stream near its source.
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873
Infiltration head
The depth of water on the surface porous media which causes infiltration.
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913
Hydraulic head
1  The energy at a given point in a liquid, expressed as the equivalent height of a column of the liquid above a given datum. 2   See 1830, 5258 and 6491......
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961
Headwater storage
Works designed to store or otherwise retain  runoff, where it originates or as near thereto as practicable, to  reduce the crest downstream......
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1039
Artesian head
Pressure head of artesian water.
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1150
Head loss (in an aquifer)
The difference in height of the groundwater table in different parts of the same aquifer resulting from resistance to flow through the aquifer......
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1233
Velocity-head rod, Velocity-head stick, Run-up
A device for measuring velocity through culverts, or over weirs, dams, etc., by placing the rod vertically in the flow and observing the `run-up` (the difference in water levels obtained at upstream and downstream of the rod); the rod is, generally, calibrated to read velocity, or discharge......
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1337
Beheaded stream
A stream with original headwater drainage area, separated from it by another stream which is more active and has greater erosive power, now drains into the other stream......
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1378
Headward erosion
1 - The erosion of a stream bed by the action of scour at the bottom of a vertical cliff or waterfall where the flow of the stream plunges, causing undermining of the cliff and its movement upstream, so that the deepened section extends upstream. It differs from cataract action in as much as only a small flow may be necessary to keep it going, or a.....
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1429
Embayment
1 - The area within the swing of the bend of a river. 2 - A deep depression in a shore line forming a large open bay. 3 - A local recession of a river bank due to erosion, i.e. a bite taken out of a river bank......
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1484
Groyne, Groin, Bankhead, Spur, Spur dike, Transverse dike, Jetty
1 - A structure built from the bank of a river in a direction transverse to the current. The groynes may be permeable, semi-permeable or impermeable. 2 - See 3479 and 8028......
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1491
Denehy`s `T` headed spur
A spur having its nose in `T` shape. In such type of spurs both the noses of `T` are protected against scouring. (Illustrated).....
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1499
Strong head
The head or outer end of a groyne specially armoured or protected with stone mesh, pitching, etc., to resist erosion.
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1500
Fending groyne, or Bankhead
Groyne which fends the current of flow of water and prevents erosion. Denehy`s groyne is an example of this type (illustrated)......
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1537
Upper bank
The portion of the river bank that is located above the low water level and below the foreshore level. See 1538.
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1538
Lower bank
The portion of a bank below low water level often extending quite a distance horizontally to the river bed. See 1537.
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1575
Tail water erosion
Linear erosion due to disturbance in sediment movement towards downstream, resulting in depletion of sediments required to reach the transportation capacity. The sediment deposit then occurs at the bottom and on the banks of the river......
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1730
Upper plastic limit
The wetness at which the soil, in layers of specified thickness, just ceases to show a tendency to flow.
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1731
Lower plastic limit
The wetness at which the soil can barely be rolled into a wire according to a specified manner.
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