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
1313
Graded stream
A geomorphological term used for streams that have apparently attained a state of practical equilibrium between the rate of sediment transport and the rate of sediment supply, throughout in long reaches......
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1364
Well graded soil
A continuous distribution of grain sizes from the coarsest to the finest components in a proportions that the successively smaller size grains just fill the spaces between the larger grains......
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1496
Cement concrete block spur
A spur made of cement concrete blocks arranged in form of steps.
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2551
Stub concrete cutoff, or Short concrete cutoff
Cutoff employed in conjunction with level rock foundations or with deep soil trenches cutoff where a good seal of earth on rock is difficult to obtain. Its purpose is to increase the path of seepage and to prevent leakage along the rock-soil contact surface (illustrated)......
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2705
Vertical concrete spiral cased setting
A turbine setting when the turbine is installed in the vertical position and the water is guided by a spiral casing (illustrated)......
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3231
Cement concrete lining, or Portland cement concrete lining
A type of rigid, smooth lining made of a mixture of Portland cement and graded sand and either gravel or crushed stone. The lining may or may not be reinforced......
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3238
Waste concrete
Fresh concrete that is rejected before placement because of inferior quality or some other undesirable condition; it includes defective concrete that must be removed after it has hardened......
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3253
Bitumen cement concrete lining, Asphaltic concrete lining, or Hot mix asphalt lining
A type of lining that uses a mixture of bitumen cement and aggregates. Usually the lining is placed while hot and compacted immediately......
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3745
Trough aqueduct, Timber trough aqueduct, Masonry trough aqueduct, Concrete trough aqueduct, Steel trough aqueduct
A form of aqueduct in which the earthen banks of the canal are discontinued through the aqueduct and the canal water is carried in a masonry, concrete, timber or steel trough, usually flumed. The sides of the trough are connected on either side of the work to earthen banks of the canal by means of wing walls. According to the material of the trough.....
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3760
Reinforced concrete syphon
A syphon, the barrel/barrels of which is/are made of reinforced concrete.
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3770
Overchute, Concrete flume overchute, Masonry flume overchute, Wooden flume overchute
A short flume structure that carries flood or drainage water across and above a canal prism and used where the cross-drainage gradient is sufficiently high to provide freeboard over the canal water surface without excessive ponding at the inlet. The flume may be of concrete, masonry or wood and is accordingly referred to as concrete flume overchute.....
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5567
Concrete, Cement concrete, Lime concrete
A mixture of aggregates (including sand) with cement and water, or lime and water. When cement or lime is the binding agent, the plastic mass of concrete can be cast or moulded into a predetermined size and shape that hardens by hydraulic chemical reaction......
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5568
Bituminous concrete
A mixture of hot or cold bitumen and aggregates.
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5569
Plain concrete
Concrete without steel or other reinforcement, it can have light reinforcement only to guard against shrinkage or temperature cracks......
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5570
Mass concrete
Concrete produced with relatively small amount of mortar to lower down the heat generated and the rise in temperature, and/or to reduce the shrinkage, etc., and to improve durability. It has little or no reinforcement against shrinkage and temperature cracks. It is used for massive construction......
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5571
Rubble concrete
It includes any class of concrete when large stones are placed. The chief use of this concrete is in constructing dams, lock walls, break waters, retaining walls, bridge piers, etc......
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5572
Cast in situ concrete
Concrete poured in place in contrast to precast concrete.
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5573
Precast concrete
Concrete that is cast into (sections) forms or moulds and then transported or hoisted and placed in position. Used principally where many of the same units are required......
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5574
Reinforced concrete, Ferro-concrete
Concrete that uses reinforcement other than that provided for shrinkage or temperature changes, embodied in a manner that the two materials act together in resisting stresses and moments......
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5575
Controlled concrete
Concrete made of selected materials, accurately measured, throughly mixed, and having a constant water-cement ratio and consistency, all batches being as nearly uniform as possible. The mix is determined by preliminary laboratory tests to give the specified strength......
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5576
Prestressed concrete
A high-strength concrete reinforced with high-strength steel cables or wires stretched within it, thus eliminating or greatly reducing cracking or tensile forces and making the maximum use of both the materials......
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5580
Air-entrained concrete
Concrete produced with the addition of purposeful air entraining agent to improve durability, and other properties of the concrete......
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5581
Pozzolan concrete
Concrete having pozzolan partly substituted for its cement contents. Such concretes have low heat evolution, require more water for given slump though much improved in workability and also require a long period of wet curing......
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5582
Vibrated concrete
Concrete compacted by vibration from an internal or external vibrator.
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5585
Prepacked concrete
Concrete made by forcing mortar into the voids of a compacted mass of clean, graded coarse aggregate. After compaction and just prior to grouting, the aggregate is wetted or preferably inundated with water. As the mortar is pumped into the forms, it displaces the water and fills the voids, thus creating a dense concrete having a high content of agg.....
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