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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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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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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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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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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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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2534
Core wall, Membrane, or Core
1 - A wall of masonry, sheet piling, or compacted puddled clay built inside an earth dam or a levee to reduce percolation (illustrated). 2 - See 5963......
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2535
Diaphragm wall
1 - A comparatively thin core type of wall built of masonry or sheet piles or concrete or a combination thereof. 2 - See 3851......
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2546
Cutoff wall, or Cutoff
1 - A wall, collar, or other structure of impervious character intended to reduce percolation of water along otherwise smooth surfaces or through a porous strata. It is provided within or on the foundations (illustrated). 2 - See 1432, 2226 and 3337......
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2553
Key wall
A cutoff wall extending from the cutoff trench into the bed rock or the impervious subsurface stratum.
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2647
Angle of external friction, or Angle of wall friction
Angle between the abscissa and the tangent of the curve representing the relationship of shearing resistance with normal stress acting between soil and the surface of another material......
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2649
Wall friction
Frictional resistance mobilized between a wall and the soil in contact with the wall.
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2836
Invert wall, or Bucket lip wall
The upturned portion of the invert having a lip (illustrated).
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