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
1622
H horizon
Is an organic horizon formed or forming an accumulation of organic material deposited on the surface, that is saturated with water for prolonged periods, unless artificially drained. H horizons form at the surface of wet soils, either as thick cumulative layers in organic soil or as thin layers of peat or muck over mineral soils. Even when ploughed.....
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6749
Habitat
1 - The natural environment in which a population of plants or animals occurs. 2 – See 9318.
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9318
Habitat
1 - The particular environment or place where an organism or species tends to live; a more locally circumscribed portion of the total environment. 2 – See 6749......
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1211
Haigh sounder
A device, based on Boyle’s law, invented by F. F. Haigh for measuring depth.
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840
Hail
Small, roughly spherical lumps of approximately concentric shells of clear ice and compact snow, collectively, that are precipitated during thunderstorms......
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2099
Half bog soil
Swampy or marshy soil with an organic horizon overlying gray mineral soil.
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445
Half life
img:equations//442_445_e.jpg
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5727
Half wrought timber
Semi-finished timber, which requires further finishing, by hand or machine, before it can be put to use.
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8173
Half-Duplex
A communications mode that allows transmission and reception of digital data between computers, but not simultaneously.
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300
Half-section
A view that shows half of the object in section and half as an elevation or other exterior view.
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7159
Half‑life
The time required for the decay or disappearance of half of a substance that decays in a regular, exponential way.
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7721
Halocline
The boundary between two masses of water whose salinity differs.
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1905
Halophobe
A plant which will not grow in a soil containing any appreciable amount of salt.
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7036
Halophyte
A plant that tolerates very salty soil.
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1903
Halophytes
Plant which will live in a soil containing an appreciable amount of common salt or of other inorganic salts.
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1904
Halophytic vegetation
Salt-loving or salt-tolerant vegetation.
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6022
Hammer mill
A crusher consisting of a higher-speed rotating shaft with suspended hammers that repeatedly strike the rock and throw it against breaker plates, thereby successively breaking the stone to small particles. Another form of hammer mill is swinghammer......
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4412
Hand-tripping
A means of giving an up-and-downward motion to tools in surging.
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9253
Handouts
Written materials that supplement, explain, or amplify a presentation. Each participant receives the same material that can be distributed before or after the presentation. When there is reason to distribute during the presentation, the handout material should be directly related to the point being made, and the presenter should stop talking during.....
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8174
Handshaking
A communications synchronizing technique carried out before and after any transfer of digital data. It consists of a sequence of signals for non-clocked (asynchronous) systems in which a reply is needed to complete a data transfer operation......
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2317
Hansen weir
It is a rectangular and suppressed laboratory weir used by V.W. Hansen in 1892 for his experiments. The head over the weir is measured at a distance of 1100 mm from the upstream face of the weir......
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7728
Hard water
Water containing high amounts of dissolved mineral salts (mainly bicarbonates, chlorides and sulphates of calcium and magnesium) that interfere with some industrial processes and prevent soap from lathering......
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8368
Hard-disk drive, Winchester Drive
A sealed unit containing high-density, high-speed, rigid metal disks, and recording heads to store digital data. It reads and writes data faster than floppy disks......
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5703
Hardening
Any process that increases the hardness.
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5534
Hardening
The process that commences at the end of the initial set and indicates the growth in strength of the mortar or concrete. Under good curing conditions, the strength increases rapidly, Sone of the properties of concrete is that it will continue to harden for years. Ordinary Portland cement hardens slowly, but rapid-hardening cement hardens quickly an.....
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