International Commission on Irrigation & Drainage Commission Interationale des Irrigation et du Drainage

Multilingual Technical Dictionary (MTD)
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Term No.Term NameTerm Description
1548GabionA 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 prote.....
1549Gabion groyneGroyne composed of any type of gabions......
1550GabionnadeAn obstruction or protective work made of gabions......
6197GainThe ratio of the output signal to the input signal of an automatic device, e.g. in proportional control, the proportionality factor between the move o.....
2471GalleryAn 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 .....
6968Game fishA fish species caught for sport; e.g. trout, salmon, bass.   Game fish typically show more sensitivity to environmental changes than rough fish......
8627Game theoryStochastic theory of games played by two or more parties. The theory analyzes the probability of winning the game when certain decisions are adopted......
156Gamma distributionThe probability distribution of a continuous random variable x that can take any value from 0 to + ¥ with the probability density : .....
7233Gamma rayThe most penetrating waves of radiant nuclear energy. Can be stopped by dense materials, such as lead.  .....
4196Gang 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......
8964Gantt chartBar chart that shows graphically the duration, including the start and end dates, of the project`s activities, as well as its milestones; can also sho.....
5665Gap graded concreteA concrete produced by omitting the intermediate sizes and deleting the extreme fines from the aggregate. This type of concrete gives greater compactn.....
8164GarbageUnwanted and meaningless information carried along in storage......
5650Gas concreteA cellular concrete obtained by mixing finely divided aluminium powder in the cement. A chemical reaction takes place with hydroxide of calcium or alk.....
5605Gas-forming agentsAdmixtures, such as aluminium powder, used to improve the intimacy of contact of the paste with adjacent concrete or aggregate particles as well as em.....
4264Gas-lift flowing wellA well in which the groundwater tapped is not under sufficient hydrostatic pressure to be lifted above the land surface without the introduction of ga.....
8165Gate ArrayA group of standard logic gates that can be interconnected into a complete circuit or system. Also called Logic Array......
3611Gate bay, Upper gate bay, Head bay, Lower gate bay, or Tail bayThe water space in the lock head. Depending on its position, it may be upper gate bay or lower gate bay......
3615Gate chamberPortion of a lock in which the lock gates operate at the opening or closing of the lock (illustrated)......
3618Gate chamber floorThe portion of the bay floor, generally depressed in the gate chamber......
2526Gate chamber of sluice wellA structure located within the abutment main body of the dam or the dam embankment where the regulating gates or emergency gates are installed. The lo.....
3617Gate chamber wallThe portion of the bay wall, usually recessed, required either for holding or for the movement of the gate or gates......
2474Gate galleryGallery provided in dams for access to and room for the mechanical equipment used for the operation of gates in outlet conduits, power penstocks, or s.....
2947Gate hangerA device to hold the gate open......
3616Gate recessesThe recesses in the side walls of the gate chamber where lock gates rest when in the open position (illustrated)......
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The Multilingual Technical Dictionary (MTD) is an e-dictionary of all technical terms related to irrigation, drainage, flood management, environment, river training, and allied disciplines of the water sector. Any term/ definition can be printed/copied with the option to download/updates of terms from the ICID website. The MTD enriches the process of sharing and exchange of experiences and has proven to be highly useful for engineers, researchers, students, professionals, planners, designers, academics and all others related to the field of irrigation and drainage.  It is more helpful for professionals outside the water sector, in simplifying the technical jargon and to understand the sectoral nuances easily. 

As part of ICID's flagship activity, it was first published in English and French languages in 1967, the – 4th  edition of the MTD (English-French) was brought out on CD-ROM in the year 2002. Currently, we are following the 5th  edition released in 2009, which defines 9,370 technical terms in Chinese, Japanese and Russian, besides English and French. This online version of MTD is based on the 5th edition's DVD format. This version includes 9370 technical terms with matching English and French translation. The DVD version also includes terms collected in Chinese, Japanese and Russian languages with the active support received from respective National Committees. However, full integration with online versions has not taken place due to the difference in available translation editions/ versions. National Committees of Iran, China, Japan, Russia, Korea, and India are working on the translation/  updating part to match the present online version.