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
371
Energy, Work, Quanitity of heat
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1355
Diversion dam
A barrier built across a stream to divert all or some of the water.
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1563
Crib, Crib dam, Pigsty work, Pigstying
A type of construction consisting of pieces of timber fixed together to form bays or cells which are filled with stone or other suitable material. May be of various shapes. Used for dams, groynes, bank protection, etc.; sometimes called `pigsty work` or `pigstying`, though the latter is also used for timber work similar to cribwork but without the .....
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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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2208
Diversion ratio
The ratio between the total flow diverted from the river/stream at the given work, and the total flow of the river/stream before diversion. It is an index that expresses the effective function of the diversion structure......
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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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2247
Diversion weir
A low dam or wall across a stream for the purpose of diverting part or all the water from a stream into a canal.
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2248
Closed weir, Overflow diversion dam, Fixed crest weir, Blind weir, or Ungated weir
A low dam built as a complete obstruction across the river so that the entire stream flow can pass over it. It may or may not be fitted with crest gates; when not fitted with crest gates, it is also called `fixed crest weir`, or `blind weir`, or `ungated weir`......
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2249
Open weir, or Open diversion dam
A diversion weir across a river to produce least obstruction to the flow. It comprises undersluices and several other bays having falling shutters fitted on a permanent structure......
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2674
Tunnel, or Temporary diversion tunnel
A passageway constructed underground, through high ground or mountains open at both ends so as to provide a path for a road, rail-road, canal, water, sewer, drain, etc. Tunnels in the context of irrigation projects (i) carry supplies of irrigation water through locations of high terrain that obstruct desirable canal routes, (ii) import supplies of .....
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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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