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
1659
Soil structure
The arrangement of soil particles into aggregates which occur in a variety of recognized shapes and sizes.
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1660
Microstructure
Soil structure in which the pattern of the mineralogical complexes of the soil materials presents a definite type of build up......
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1661
Macrostructure
Soil structure presenting the aggregates of the mineralogical complexes into larger units, as a result of cementation.
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1662
Structure index
A soil property which is measurable and may be evaluated on a numerical scale and is related to soil structure, i.e. aggregation, bulk density, moisture retention, penetrometer force......
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1663
Structure factor
The ratio of the difference between the total clay obtained by complete dispersion and the clay obtained by water dispersion expressed as a percentage of the former......
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1669
Single-grained structure
Physical state of soil in which there is no aggregation of the separate particles.
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1671
Granular structure
Structure composed of soil granules.
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1672
Crumb structure
A term applied to granular structure when the granules are more porous and irregular in size and shape.
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1673
Platy structure
Structure having aggregates with horizontal dimension greater than vertical dimension.
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1674
Prismatic structure, Columnar structure
Structure with vertically elongated aggregates in the shape of prisms; where the prisms are rounded at the top, they are designated `columnar`......
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1675
Blocky structure, Nut structure, or Blocklike structure
Structure in which aggregates are of considerable size; when the size of the aggregate is small, it is termed as a `nut structure`. Blocks or polyhedrons having plane or curved surfaces......
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2207
Headworks, Diversion work, or Diversion structure
1 - A term used collectively for all works, principal structures and equipment (weirs, barrages, dams including diversion dams, head regulators, river training works intakes in rivers, pumping station and /or appurtenant) used for storing or extracting water resources, and /or transferring water, to control river flows and diverting water and contr.....
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2214
Head gate structure
1 - The portion of the head regulator that houses control gates. 2 - Often used in the same sense as a head regulator.
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2343
Columnar buttress dam
A type of deck dam when the massive buttresses are replaced by a series of inclined columns.
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2699
Hydroelectric power house, Power house building, or Power house superstructure
A building housing and protecting the generating and control equipment.
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2726
Inlet control, or Inlet structure
A structure built at the upstream end of the outlet conduit of the outlet works and housing the regulating or emergency gates, usually combined with the trash rack structure......
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2727
Intake structure, or Intake
1 - A structure placed in the very source of surface-water to permit the withdrawal of water from this source. 2 - See 3439 and 4625......
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2764
Control structure
A stage-discharge regulating device of the spillway. It may be of any form, viz. weir, side channel, glory spillway, orifice, tube, pipe or a channel......
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2765
Normal control structure
A control structure where the water flow is normal to its crest and passes through the structure with no general change in direction either in the form of open channel or shaft or tunnel. The normal control structure is essentially a weir......
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3318
Protective structures
Structures that convey storm or drainage water over or under the canals or that provide controlled discharge or project water for purposes of safety......
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3319
Communication structures, Access structures, or Accommodation structures
Structures that provide (i) communication over irrigation channels or drains for pedestrians, cattles, farm implements, vehicles and railway trains, (ii) means of access to all parts of the distribution system......
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3320
Navigation structures
Structures built in canals and canalized or navigable waterways where headway and other facilities exist or are provided for the direct passage of vessels and boats......
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3417
Flumed structure
1 - A hydraulic structure built in a stream or a channel with contracted waterway, e.g. a flumed bridge, flumed fall, or flumed aqueduct. 2 - A hydraulic structure with contracted width or waterway for measurement of discharge flowing in channels. 3 - An artificial water channel in a laboratory used for model tests......
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3436
Cross regulator, Check structure, Combined cross regulator, Access bridge with check, Road bridge with regulator, or Check
1 - A structure designed to control the water surface level and flow in a canal, maintaining a specified water depth or head on outlets or turnout structures, particularly when the flow is small. In Australia it is called `Access bridge with check`, or `Road bridge with regulator`. 2 - See 4066......
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3439
Offtake regulator, Intake structure, Turnout, or Head of offtake
1 - A structure built at the head of an offtaking branch or distributary channel to control and admit regulated supplies into it from the parent canal. Also called `intake structure`, `diversion structure` or `turnout`. Also commonly referred to as `head regulator` or `head of offtake`. 2 - See 2727 and 4625......
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