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
155
F-Distribution
The distribution of the ratio F of two independent quantities, each being distributed like a variance in normal samples.
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191
F-Test
The test of significance based on the F-distribution.
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5975
Face
The approximately vertical surface extending upward from the floor of a pit to the level where from the is being done.
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5901
Face formwork
A type of formwork that initially fulfills the same function as temporary formwork, but after concreting serves as a permanent external facing of the structure......
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2217
Face wall
A wall (retaining wall) built of masonry or concrete having different material on the front and back. When applied to irrigation, it is provided immediately above the face of a submerged orifice, opening or sluice......
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2598
Factor of safety
An index of stability of a structure with respect to its sudden failure.
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7091
Facultative bacteria
Those bacteria that are able to live and grow under more than one set of conditions, with or without oxygen.
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7370
Faecal streptococcus
A bacteria of the intestinal tract characterized by ability to grow at relatively high pH and temperature. Useful as an indicator of recent faecal pollution by warm blooded animals, including man......
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6999
Faeces
The indigestible residue of food together with residue of secretions, bacteria, etc., expelled from the alimentary canal......
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6130
Fair lead
A device of sheaves or rollers to line up cable so that it will wind smoothly on to a drum.
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4617
Fall irrigation (USA)
Watering carried out just after harvesting the summer crop to restore the soil to the desired moisture status.
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3525
Fall, Drop, Drop structure, Fall structure, Canal weir
1 - A structure designed to secure the lowering of the water surface in a channel in a short distance, and the safe destruction of the liberated surplus energy. In Egypt, a fall or drop structure with water flowing over it and having its surface subject to atmospheric pressure is called a `canal weir`. 2 - The terms `fall` or `drop` also refer to t.....
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2268
Falling crest weir, or Falling shutter weir
A weir having falling shutters fitted along its crest that may be put down to pass floods. Falling crest arrangement is installed in both permeable and impermeable weirs......
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7236
Fallout
Material, especially radioactive, deposited from the atmosphere.
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5002
Fallow cultivation / period
An agricultural system with an alternation between a cropping period of several years and a fallow (without cultivation) period with natural fallow vegetation. .....
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6305
False colour picture, or Color picture
Picture with colours artificially changed to enable better recognition of certain objects or materials.
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5533
False set, Grab set, or Premature stiffening (cement)
Setting of cement that rapidly develops a crust, sufficient to indicate an initial set, but that is not hardened in the interior and on reworking may set normally......
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5858
Falsework
1 - Temporary bracing for the construction of a more permanent work. 2 - Any temporary support for concrete formwork or for a masonry arch......
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6833
Family
In taxonomy, a primary division of the plant and animal kingdom comprising a group of similar genera.
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9187
Family living allowance
In making inventories of farm income and expenses, the amount allowed for the family expenses judged consistent with social goals. It may be more or less than the farmer`s labour and management return......
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8457
Fan-In
The maximum number of output terminals from other logic gates that can be connected to an input terminal of a specified logic gate......
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8458
Fan-Out
The maximum number of input terminals that can be connected to the output terminal of a specified logic gate.
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9177
Farm
All the land that is directly farmed by one person, either by his own labour or with the assistance of his household or hired employees......
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9175
Farm budget analysis
Analysis of the farm`s income and expenditure.
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9179
Farm capital
The value of all owned farm land, farm buildings, excluding those meant for residential purposes, livestock, implements and tools owned by the operator......
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