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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1538
Lower bank
The portion of a bank below low water level often extending quite a distance horizontally to the river bed. See 1537.
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1731
Lower plastic limit
The wetness at which the soil can barely be rolled into a wire according to a specified manner.
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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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2237
Downstream undersluice channel
A portion of the river or a channel made in the river that confines the erosive effects of the water discharged through the sluice gates that again joins the river downstream......
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2284
Method of independent variables, or Khosla`s method of determination of uplift pressures and exit gradients
It is an empirical method evolved by an Indian Engineer A N Khosla for determining uplift pressures with high accuracy for a weir founded on permeable soils. The complex foundation profile is broken up into a number of simple profiles, each of which is independently amenable to mathematical treatment......
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2292
Exit gradient
The hydraulic gradient of the emerging streamlines at the end of an impervious apron.
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2468
Downstream toe line
Line joining the downstream slope or face of a dam with ground surface or downstream river bed.
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2469
Downstream toe
Junction of the downstream slope or face of a dam with the ground surface or downstream river bed.
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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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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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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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2781
Lower limb, or Lower leg
The portion of the hood between the crown and the exit lip (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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2869
Tailwater rating curve, or Downstream stage discharge curve
A curve showing relationship between the discharge and the corresponding tailwater stage.
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