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
130
Degrees of freedom
The degrees of freedom of a set of observations (ex- hypothesis are subject to sampling variation) is the number of independent values in the sample that could be assigned at will within the specification of the system......
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951
Sharp-crested flood
Flood of short duration with a relatively high peak discharge.
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1653
Degree of dispersion
Extent to which soil aggregates are broken down to primary particles by any given treatment.
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1665
Degree of aggregation
Measure of the proportion in which aggregates are present.
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1720
Degree of aeration, or Air space ratio
Ratio between the volume of air and the volume occupied by the voids.
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1774
Degree of saturation (V)
Percentage ratio of exchangeable cations exclusive of H+ (= S ) to total exchangeable cations inclusive of H+ (= T ), i.e.  .....
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1802
Degree of saturation
1 - Ratio between the volume of water and the volume of voids. 2 - See 1774.
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2154
Degree of salinity
Percentage of soluble salts in the root zones.
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2336
Straight gravity dam
A gravity dam having a straight water side face in plan.
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3003
Straight canals
Canals having straight or slightly curved alignment as is typical of canals in flat plains.
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3263
Straight-run bitumen
Bitumen produced directly by distilling off the volatile constituents of the crude oil.
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3383
Transition, Hydraulic transition, Curved splayed transition, Curved tapered transition, Straight splayed transition, Straight tapered transition, Cylinder-quadrant transition, Conical frustum transition Conversion, Straight warped transition (illustrated), Curved warped transition, Streamlined transition, Valve transitions, Inlet transition, Approach transition, Entrance transition, Upstream transition, Upper transition, Outlet transition, Departure transition, Exit transition, Downstream transition, Lower transition, Tunnel transition, Supercritical transitions, One-dimensional supercritical transitions, or Two-dimensional supercritical transitions
1 - A length of conduit or channel wherein the cross-sectional shape is gradually changed from that of the conduit or channel upstream to that of the conduit or channel downstream. The transitions are characterized by adjectives bearing on their length (e.g. short, long, sudden, gradual), geometrical shape of the side walls (e.g. splayed, straight,.....
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3409
Sharp transition, or Short transition
A transition whose length is less than required by the standard design procedure or test research.
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3531
Straight glacis fall, or Straight glacis drop
A fall or drop with an inclined flat downstream glacis.
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3676
Sharp-edge orifice
An orifice with sharp upstream edge.
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3837
Cut-water
The upstream nose of a pier shaped for streamline entry of flow into bays. The usual shapes are semi-circular, segmental, elliptical and pointed; termed according to the shape......
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3838
Sharp (nose) cut-water, or Pointed (nose) cut-water
A cut-water formed by two oppositely directed, curved or straight surfaces meeting at a plane.
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3839
Blunt (nose) cut-water
A cut-water in which the nose is rounded off.
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3840
Circular (nose) cut-water, or Half round cut-water
A blunt cut-water formed by the round surface of a half cylinder.
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3841
Segmental cut-water
A sharp cut-water formed by two segmental surfaces meeting at a plane. The segmental cut-water is classified according to the apex angle, e.g. 90o segmental cut-water......
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3842
Straight (line, surface) sharp cut-water, Equilateral cut-water, or Sixty degree straight sharp cut-water
A sharp cut-water formed by two straight surfaces meeting at a line. Since the two straight sides of the cut-water and the width of the pier form a triangle, it is, sometimes, classified according to triangle properties (viz. equilateral cut-water) and also according to the value of the nose angle (as 60o straight sharp cut-water)......
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3843
Elliptical cut-water
A blunt cut-water formed by an elliptical surface, usually with minor axis as the pier width.
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3844
Asymmetrical (nose) cut-water
A cut-water having asymmetrical nose shape to suit special flow conditions, sometimes, warranted by cross currents and oblique flow (illustrated)......
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3871
Straight head-wall culvert
A culvert having its head walls parallel to the earth bank it supports. Usually both the inlet and outlet head walls of a culvert are of the same form (illustrated)......
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3944
Sharp-crested weir, Sharp-edged weir, or Thin-plate weir
A weir constructed with a crest of vertical thin plate shaped in such a manner that the nappe springs clear from the crest......
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