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
139
Likelihood
Likelihood is defined as numerically equal to the probability when a series of hypotheses is being considered.
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198
Maximum likelihood method
The method of estimating a parameter (or parameters) of a population by that value (or values) which maximizes (or maximize) the likelihood of a sample......
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1537
Upper bank
The portion of the river bank that is located above the low water level and below the foreshore level. See 1538.
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1730
Upper plastic limit
The wetness at which the soil, in layers of specified thickness, just ceases to show a tendency to flow.
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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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2238
Upstream undersluice channel, or Upstream scouring sluice channel
The portion of the river channel leading water to the undersluices and limited up to the sill of the undersluices. `Pocket` is only a part of the upstream undersluice channel......
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2467
Heel line, or Upstream toe line
The line joining the upstream slope or face of a dam with the valley floor or the ustream blanket.
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2538
Shell, Upstream shell, Upstream fill, Downstream shell, Downstream fill or Shoulder
A component of an earth dam constructed of pervious or semi-pervious material upstream and downstream of the core or membrane. The upstream portion is called `upstream shell` (illustrated) and the downstream portion `downstream shell` (illustrated)......
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2543
Upstream blanket, or Riverside blanket
A blanket of impervious material provided on the upstream of an earthen dam or on the river side of a Levea (called riverside blanket) on a pervious sub-stratum, for controlling the seepage of water by increasing the path of travel as also the entry of water into the substratum to reduce the flow of seepage as well as the phreatic pressure on the d.....
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2593
Swedish slip circle method, or Slip circle method
A method used to analyse the stability of an earth dam or rockfill structure wherein the failure is assumed to take place along the cylindrical surface in the form of a rotational slide......
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2594
Slip circle, or Swedish break
An idealized cylindrical surface through an earth or rockfill structure along which a slide failure or slip may take place......
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2763
Entrance channel
A channel that convey water from the reservoir to the control structure of a spillway.
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2773
Saddle siphon, or Hood siphon
A siphon having its duct formed of a U-shaped hood. The inlet lip of the hood is submerged below the full reservoir level and that of the outlet lip terminates in a water seal formed by various devices. The siphons are sometimes named according to the water seal provided (illustrated)......
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2775
Hood, or Cowl
A U-shaped body or structure made of reinforced cement concrete made over the body wall to form a siphon duct (illustrated)......
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2777
Entrance lip of hood, Upper lip of hood, or Upstream lip of hood
The upstream edge of the hood that remains submerged below the full reservoir level for siphonic action to begin (illustrated)......
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2778
Upper limb, or Upper leg
The portion of the hood from the inlet lip to the crown (illustrated).
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2782
Exit lip of hood, Downstream lip of hood, or Lower lip of hood
The downstream edge of the lower limb (illustrated).
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2822
Deflector hood
A curved deflector, used in jet diffusion method, to prevent the jet from being torn apart by induced eddies until it is well submerged (illustrated)......
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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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2837
Bucket lip
The top surface of the invert wall (illustrated).
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2838
Height of bucket lip
The distance from the lowest concave surface of the bucket to the top of the lip (illustrated).
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2841
Dentated bucket lip
A bucket lip with protruding teeth over its length.
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2844
Trajectory bucket, or Flip bucket dissipator
A type of energy dissipator employed in cases where the tail water depth is less than that required for the formation of a hydraulic jump by throwing water away from the toe of the dam in the form of a projectile (illustrated)......
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2871
Hydraulic rollers, Circular roller, Elliptical roller, Vertical roller, Horizontal roller, Inclined roller, Submerged roller, or Surface roller
Flow of water adopting circular or elliptical motion round a vertical, horizontal or inclined axis lending the appearance of a roller within or at the surface of the stream.  They are named circular or elliptical rollers according to the shape adopted while the direction of axis lends the designation of vertical, horizontal or inclined rollers.  Ac.....
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3094
Upper critical velocity
The average velocity when flow changes abruptly from laminar to turbulent.
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