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
1508
Training wall
A structure built along or connected to the bank of a river substantially parallel to the direction of flow, e.g. an extension to a flank wall, intended to direct fast flow from a sluice or spillway away from erodible banks of a river or canal......
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1567
Rough log training wall
A type of bank protection used in New Zealand. It consists of pyramidal trestles, built of rough logs, with other logs wired from trestle to trestle on the side nearest to the river. Checking of the current by the log-grid causes a shingle deposit and so builds up a bank. (illustrated)......
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1931
Wall pressure
Wall pressure is equal to and synonymous with turgor pressure for an isolated cell under equilibrium conditions.
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2064
Tide gate
An opening, through which water may flow freely in one direction, but which closes automatically and prevents the water from flowing in the other direction......
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2164
Slick spots, Scab spots, or Buffalo wallows
Small areas in a field that are somewhat slick when wet due to alkali or high exchangeable sodium.
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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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2216
Breast wall
A low wall (retaining wall) built of masonry or concrete to retain the face of a natural or man made bank of earth or composite section of earth, masonry or concrete. In case of irrigation works it may also be provided at the end of an apron/platform to contain the pressure and can be in a submerged state too......
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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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2218
Panel wall
A non-bearing partition between columns and/or piers. In irrigation context it is a distinct wall in between the two supports or either ends......
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2221
Wing wall
1 - The wall of a dam structure extending from the headwall downstream a distance equal to the length of the apron, constructed to prevent sloughing of banks or channels and to direct and confine overfall. Wall (s) joining the abutments of a structure to an earthdike or the bank to increase the length of percolation-path around the end of a structu.....
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2223
Inlet wing wall, or Upstream wing wall
Wing wall connecting the abutments with the banks of the parent channel or the banks upstream of the structure.
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2224
Outlet wing wall, or Downstream wing wall
Wing wall connecting the abutments with the offtaking channel section downstream of the structure.
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2225
Flank wall
The retaining wall in continuation of abutments both upstream and downstream.
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2226
Curtain wall, or Cutoff wall
1 - A cross wall built under the floor of a hydraulic structure with the object of dividing the work into suitable compartments. 2 - A thin wall or footing constructed downward from, under or around the headwall and lipwall of a dam or any other hydraulic structure to provide resistance to seepage or to increase the path of seepage is called a cut-.....
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2227
Toe wall
A low wall built of masonry or concrete or stones without using mortar, below the bed or floor level to provide footing for the sloped pitching or face of an embankment......
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2231
Gates
A device to stop or release water through a passage. For various types see sub-head V.4 `Gates and valves`.
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2239
Divide wall, Divide groyne, Division wall, or Dividing wall
A longitudinal wall or groyne separating the undersluices pocket section from the weir or barrage section (illustrated).
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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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2272
Segment gate weir
A weir fitted with segment gates on its crest.
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2273
Flap weir, Flash board weir, or Tilting gate weir
A type of movable weir in which a hinged leaf gate rotating about a horizontal axis is installed at the weir crest. Also called `flash board weir`......
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2339
Single wall buttress
A buttress of solid section. It may have (a) uniform thick section, (b) (i) thin section reinforced by stiffeners for lateral stability, (ii) thin section reinforced by struts between the adjacent buttresses for lateral stability......
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2340
Double wall buttress, or Hollow buttress
A buttress made of thin concrete sections duly stiffened in between by stiffeners.
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2372
Core-wall type rockfill dam
A rockfill dam that has a core wall of steel, concrete (plain or reinforced) or compacted earth in the centre and loose rockfill is dumped on both sides......
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2474
Gate gallery
Gallery provided in dams for access to and room for the mechanical equipment used for the operation of gates in outlet conduits, power penstocks, or spillway crests......
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2503
Insulating wall
A thin wall of reinforced concrete provided along the downstream face of a dam or at a little distance from it to protect it from frost damage in cold countries......
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