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
1548
Gabion
A crate or box made of wire mesh, filled with stone. Gabions may be laid in courses like large bricks to form bank revetment, groynes, aprons or protective pavements, and so forth. In some form, similar to `tarungars` (See 1554). .....
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1549
Gabion groyne
Groyne composed of any type of gabions.
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1550
Gabionnade
An obstruction or protective work made of gabions.
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6197
Gain
The ratio of the output signal to the input signal of an automatic device, e.g. in proportional control, the proportionality factor between the move of the controlling element and the deviation of the controlled variable from the setpoint. .....
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2471
Gallery
An opening or passage provided within the body of a structure that may run either transversely or longitudinally and may be either horizontal or on a slope......
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6968
Game fish
A fish species caught for sport; e.g. trout, salmon, bass.   Game fish typically show more sensitivity to environmental changes than rough fish......
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8627
Game theory
Stochastic theory of games played by two or more parties. The theory analyzes the probability of winning the game when certain decisions are adopted......
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156
Gamma distribution
The probability distribution of a continuous random variable x that can take any value from 0 to + ¥ with the probability density : .....
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7233
Gamma ray
The most penetrating waves of radiant nuclear energy. Can be stopped by dense materials, such as lead.  
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4196
Gang of wells, or Battery of wells
A group of wells, connected by pipe manifold, from which water is drawn by a single pump or other water lifting devices.
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8964
Gantt chart
Bar chart that shows graphically the duration, including the start and end dates, of the project`s activities, as well as its milestones; can also show the relationships between the project`s activities, e.g., the finish of one task before another begins.....
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5665
Gap graded concrete
A concrete produced by omitting the intermediate sizes and deleting the extreme fines from the aggregate. This type of concrete gives greater compactness and better strength results......
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8164
Garbage
Unwanted and meaningless information carried along in storage.
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5650
Gas concrete
A cellular concrete obtained by mixing finely divided aluminium powder in the cement. A chemical reaction takes place with hydroxide of calcium or alkali that liberates hydrogen, which forms the bubbles. Powdered zinc can also be used. Sometimes hydrogen peroxide is used; this generates oxygen......
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5605
Gas-forming agents
Admixtures, such as aluminium powder, used to improve the intimacy of contact of the paste with adjacent concrete or aggregate particles as well as embedded steel reinforcing bars......
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4264
Gas-lift flowing well
A well in which the groundwater tapped is not under sufficient hydrostatic pressure to be lifted above the land surface without the introduction of gas but is caused to rise above the surface because of the buoyancy of natural gas mingled with water......
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8165
Gate Array
A group of standard logic gates that can be interconnected into a complete circuit or system. Also called Logic Array.
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3611
Gate bay, Upper gate bay, Head bay, Lower gate bay, or Tail bay
The water space in the lock head. Depending on its position, it may be upper gate bay or lower gate bay.
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3615
Gate chamber
Portion of a lock in which the lock gates operate at the opening or closing of the lock (illustrated).
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3618
Gate chamber floor
The portion of the bay floor, generally depressed in the gate chamber.
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2526
Gate chamber of sluice well
A structure located within the abutment main body of the dam or the dam embankment where the regulating gates or emergency gates are installed. The lower portion of the chamber provides an anchorage for the gates and liner while the upper portion furnishes a working space for the removal of the gate leaf and other parts for repair or for installati.....
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3617
Gate chamber wall
The portion of the bay wall, usually recessed, required either for holding or for the movement of the gate or gates.
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2474
Gate gallery
Gallery provided in dams for access to and room for the mechanical equipment used for the operation of gates in outlet conduits, power penstocks, or spillway crests......
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2947
Gate hanger
A device to hold the gate open.
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3616
Gate recesses
The recesses in the side walls of the gate chamber where lock gates rest when in the open position (illustrated).
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