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
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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2862
Baffle wall, or Baffle
A cross wall, a set of vanes or guides, a grid, grating or similar device placed in a conduit to check eddy currents below them, and to effect a more uniform distribution of velocities to dissipate energy......
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2864
Splitter wall, Divider wall, or Vanes
Longitudinal walls provided in open channels or basin expansions, for recovery of head and equalization of outlet velocity or reduction in expansion length......
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2866
Spillway training wall
Wall built on the sides of spillway of suitable height to contain the maximum tail water levels of designed discharge and provided with a freeboard that would take the spraying and air entrainment into account......
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2867
Stilling basin training wall
Wall built at the two sides of the stilling basin with the top set at an elevation so that maximum tail water for the design discharge will be contained within the stilling basin with sufficient freeboard taking the spray and air entrainment of the turbulent water into account......
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2868
Bucket training wall
Wall built at the sides of the bucket with top set at an elevation so that maximum tail water for the design discharge will be contained within the bucket portion with sufficient freeboard taking spray and air entrainment......
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3064
Wall
The bounding or inside surface of a conduit, manmade or natural, conveying liquid.
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3154
Transition wall
Wall positioned between normal section and flumed section of a structure for smooth transition of flow.
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3202
Core wall
A wall of masonry, sheet piling, puddled clay, etc., built inside a bank to reduce percolation.
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3252
Domali, or Dwarf walls
Walls built at intervals beneath the lining on sides as well as under bed.
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3336
Return walls
Walls, carried transverse to the centre line of the stream, starting off either from the abutment directly or from any type of wing walls, whether in line with the current, splayed, curved, or straight......
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3337
Staunching wall, Cutoff, or Cutoff walls
1 - A transverse wall projecting from an abutment, usually at right angles, into the embankment to intercept seepage. 2 - See 1432, 2226 and 2546......
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3395
Flared wall
Retaining wall with its profile gradually changing from one shape to another as required. Flared walls may be straight and curved......
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3473
Distributor, Divisor, or Divider
1 - A structure built on a canal to distribute its flow either between two or more offtakes at the end of a canal or between itself and one or more offtakes; the division of flow remaining unaffected by the water level on the downstream of the structure in each channel. 2 - See 3933......
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3474
Proportional distributor, Proportional divisor, or Proportional divider
A distributor that divides the flow either in a constant proportion or in variable proportions.
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3475
Fixed proportional distributor, Fixed proportional divisor, or Fixed proportional divider
A proportional distributor tht divides the flow in a constant proportion (illustrated).
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3476
Regulated proportional distributor, Regulated proportional divisor, or Regulated proportional divider
A proportional distributor identical with the fixed proportional distributor except that the splitter is mobile instead of being fixed and its manipulation enables the flow to be divided in desired proportions; for instance, Neyrpic flow divisor (illustrated)......
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3477
Preferential distributor, Preferential divisor, or Preferential divider
A distributor built on a canal where two or more canals take off to divide the flow such that one offtake canal draws almost constant discharge irrespective of the variations of discharge in the parent channel, but other offtake canal or canals and the parent channel divide the balance discharge in constant proportions (Example of the offtake canal.....
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3480
Take-off distributor, Take-off divisor, or Take-off divider
Device placed in the offtake structure where volume of water to be diverted is only a small fraction of the water flowing in the parent channel, the volume drawn is generally constant in spite of the variations in flow and water levels in the parent channel. Except in small variations of water levels in the parent channel, the water level upstream .....
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3484
Distributor with baffle wall offtake regulator
A distributor built on a canal drawing flood waters for irrigation, or subject to varying supplies, such that the offtake regulator draws proportionate supplies for, and below, normal discharges in the parent channel, but in case of supplies in parent channel much in excess of the normal, the offtake regulator draws only slightly more than its desi.....
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