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
175
t -Distribution, or Student distribution
If x is a normally distributed random variable with zero mean and unit variance, and c2 is a random variable that is independent of x and has a chi-square distribution with n degrees of freedom, the random variable .....
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194
t-Test, or Student`s test
A test based on the distribution known as Student`s or t-distribution.
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4453
Tabba, or Taboot
An Egyptian water lifting device for lifts midway between those of sakia and zawafa; actually a rim discharge sakia.
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104
Table
A condensed collection and arrangement of related numbers, their developed values or other items assembled in some definite order, as a table of logarithms......
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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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8568
Tactics
The elaboration of programmes into specific projects.
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6127
Tag line
A small cable under tension that keeps the bucket from spinning, swaying, twisting, or drifting.
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6780
Taiga
Flat, marshy subarctic forest, usually of spruce, firs or pine trees. The area between the tundra and the steppe or between tundra and deciduous forest or grassland......
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3292
Tail
1 - The end of a canal. 2 - The term is also applied to the work constructed at the end of a canal for the distribution of water thereat......
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3663
Tail cluster
Two or more outlets at the tail of a distributing channel (illustrated).
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8702
Tail control
A device to control the water slope and level at the end of a model by either a mechanically operated gate or some other arrangements......
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4055
Tail drain, or Waste ditch
A furrow or small ditch at the lower edge of an irrigated field for collecting surplus water for either removal or redistribution......
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3572
Tail escape
1 - An escape built at the tail of a canal to discharge surplus water to maintain the required full supply level, to scour the silt deposited in, and/or to empty, the tail reach. 2 - See 3293 and 4646......
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3614
Tail gates, Outer gates, or Lower gates
Lock gates on the lower water-level side of the lock.
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3406
Tail inlet transition
The transitions provided upstream of a tail structure or at the tail end of, and contained within, the conduit length.
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3407
Tail outlet transition
The transitions provided partly or wholly downstream of a tail structure or tail end of a conduit.
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2694
Tail race, or After-bay
A channel conducting water away from a water wheel or water turbine at the end.
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3291
Tail reach
The last reach of a canal, i.e. the portion from the last control point to the tail.
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3588
Tail regulator, or Outfall regulator
Regulator built at the outfall or tail of a waste channel.
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3666
Tail tank
A reservoir supplied with water from a canal whenever in excess of canal requirements, having its own command and usually situated near the tail of a canal......
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4647
Tail tank
A reservoir having water supply from a canal when the flow conveyed is in excess of the requirements. The tank situated near the tail of the canal supplies water to a separate irrigation system......
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3405
Tail transitions
A transition or system of transitions provided at the tail end of a conduit or at a tail structure.
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3705
Tail wall
A wall of masonry or concrete built at the downstream end of an outlet, containing the exit opening of the orifice or trough discharging into the delivery channel. It protects the fill from scour and undermining and serves as a retaining wall......
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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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3995
Tail-enders
Farmers having their fields/farms located far away towards the tail or end of a water distribution channel in an irrigation system, thereby being susceptible to deficient supplies in an inadequately managed system.  .....
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