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
1627
C horizon
Is a mineral horizon (or layer) of unconsolidated material from which the solum is presumed to be formed, and which does not show properties diagnostic of any other master horizons......
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8430
C-Language
High-level programming language developed mainly for writing structured system programs.
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9287
C3 Plants
1 - Plants that produce a three-carbon compound during photosynthesis, including most trees and agricultural crops such as rice, wheat, soybeans, potatoes, and vegetables. 2 – See 9288......
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9288
C4 Plants
1 - Plants that produce a four-carbon compound during photosynthesis (mainly of tropical origin), including grasses and the agriculturally important crops maize, sugar cane, millet, and sorghum. 2 – See 9287......
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6128
Cab
A covered shelter fitted on an excavator for the operator.
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6159
Cable drag scraper, or Power drag scraper
An excavating machine consisting mainly of a crescent bottomless scraper bucket-attached by front and rear bridle chain to two long wire cables, one known as the load cable and the other the back haul cable, that wind and unwind on two drums of a hoist. The bucket is not lifted but is dragged over the material......
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8345
Cable modem/Modem
A type of modem that allows people to access the Internet via their cable television service.
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4670
Cablegation
A method of controlling the water supply to irrigated furrows or corrugations whereby a single, gated, pipeline is used for conveying as well as delivering individual streams of water.  The quantity applied in each stream is determined by the speed of advance of a piston placed inside the pipeline and pushed by the static pressure of water; the rat.....
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6119
Cableway drag scraper
A digging bucket operated on a cable between a mast and an anchor that is not lifted off the ground during a normal cycle. In short also called `drag scraper`......
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6158
Cableway excavators
An excavating machine consisting of (i) two towers or masts, fixed or moveable; (ii) Track cable; (iii) Tension cable and guide blocks; (iv) A load cable (dragline); (v) Digging bucket and trolley carrier; (vi) Guy cables for the fixed mast; (vii) Bridle cable......
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6074
Cableways
An apparatus for transporting freshly mixed concrete from the batch plant to the point of placement, consisting of containers carried along moving, overhead cables. Cableways typically consist of the head tower and the tail tower with electrically operated track cable, hoist cable, in haul and out haul cable running between the two towers......
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8347
Cache
A special high-speed storage mechanism, either as a reserved section of main memory or an independent high-speed storage device. This high-speed buffer memory is similar to a Scratch pad memory, but has a larger capacity; it is located in the Central Processing Unit. A cache can also serve as a storage section between the CPU and a hard disk to spe.....
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8346
Cache memory
Section of high-speed memory tht stores data that the computer can access quickly.
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8429
CAD/CAM
Computer Aided Design/Computer Aided Manufacture. Interaction between computers used for designing and those for manufacturing a product......
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8938
Cadastral surveys, Land survey, Property survey
Surveys relating to the establishment of land boundaries and subdivisions made to create or define limitations of titles. They also include surveys to retrace or restore property lines and corners. The term `land survey` and `property survey` are synonymous with cadastral survey......
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7141
Cadmium
Chemical element, atomic number 48.  A heavy metal that accumulates in the environment.  Can be leached from the galvanizing on water pipes......
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3888
Cail type fishway
A type of pool and orifice fishway with staggered orifices.
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5837
Caisson pile or Cow caisson, Boston caisson
A device for sinking small shafts through soft clay or silt to prevent excessive loss of ground. A short cylinder of steel plate is driven into the clay that is then excavated within it until the clay in the bottom begins to heave. Another short cylinder of slightly smaller diameter is then driven inside the first and so on until the shaft reaches .....
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5880
Caisson, or Pneumatic caisson
A watertight, cylindrical or rectangular chamber dug out or sunk into the ground surface for access to the bed of a stream or body of water. It is used in under water construction to protect workers from water pressure and soil collapse. If closed at the top and water is excluded by air pressure it is called a `Pneumatic caisson`......
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7666
Calcareous
Having sufficient accumulation of calcium carbonate to produce a pH over 7.0.
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1641
Calcareous crust
Indurated horizon cemented with calcium carbonate.
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2146
Calcareous soil
Soil that is alkaline because of the presence of free calcium or magnesium carbonate or both. It effervesces visibly when treated with cold 0.1 N hydrochloric acid......
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7039
Calcifuge
Growing best on acid soil.
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7241
Calcination, or Calcining
The exposure of an inorganic chemical compound or mineral to a uniform high temperature to alter its chemical form and drive off a substance that was originally part of the compound. Most commonly used in processing high‑level radioactive wastes......
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1901
Calciphile, or Calcicole
Plants which take in large quantities of calcium.
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