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
286
Working drawing
A drawing that gives all the information, details and dimensions, necessary for the complete construction or manufacture of the object represented......
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287
Assembly drawing
A drawing of the structure or machine put together, showing the relative positions of the different parts.
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288
Design drawing
The drawing layout whereon the scheming, planning and designing are accurately worked out, after the general ideas have been determined by freehand sketches and calculations......
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289
Outline assembly drawing
A drawing to give a general idea of a structure or machine and containing only the principal dimensions.
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290
Detail drawing, or Detailing
The drawing of a separate piece or component of a structure or machine, giving a complete and exact description of its form, dimensions and construction......
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291
Tabular drawing
The drawing, either assembly or detail, where the dimension lines are given reference letters and an accompanying table on the drawing lists the corresponding dimensions for a series of sizes of the structural parts or the machine parts, thus making one drawing serve the range covered......
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1414
Regime silt charge
Minimum transported load consistent with a fully active bed.
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1467
Shoaling, or Shallowing
The act of filling up with shoals.
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1656
Silt
1 - A soil textural class. A soil separate consisting of particles between 0.05 and 0.002 mm. in equivalent diameter. 2 - See 7639......
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2105
Peat clay, or Organic silt
The lowest layer of a moor in which mineral and organic constituents are mixed.
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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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2222
Wing levee, Afflux bund, or Afflux bank
An embankment or dike designed to prevent the outflanking of the abutment by flood waters passing round the end of the weir, extending up to, but not across, the whole of the river flood plain......
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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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2244
Silt excluding devices
Devices and controls such as excluders, regulation and orientation of the head regulators to exclude entry of coarse silt into the offtaking channels......
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2392
Desilting strip
A strip of land located on the fringes of a reservoir, stock tank, pond or cultivated fields used for deposition of silt and debris carried by flowing water. The strip contains a vegetal cover of sufficient density to retard flow of runoff- water and deposition of suspended material......
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2427
Underflowing turbidity currents
It is the common type of density currents that move down the bottom of a reservoir, lake or deep channel due to a greater density of the turbid water resulting from the inclusion of suspended sediment......
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2632
Silt pressure, or Silt load
Pressure exerted by saturated silt deposited against upstream side of a water retaining structure. The horizontal component (Vs) of silt load is given by Rankine`s formula by neglecting friction .....
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2884
Hinged gate, or Swing gate
Gate that has fixed or movable hinge and operated for controlling flow accordingly. This is also sometimes referred to as `swing gate`.....
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3078
Area flowing full
The condition of flow in a closed conduit when the flowing liquid occupies the entire cross-sectional area.
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3146
Lacey`s silt factor (f )
A factor introduced by Lacey in 1930 based on the theory that in all regime channels of the same silt grade the ratio V2/R in which V denotes the mean velocity and R the hydraulic mean depth, characterizes turbulence and is constant. When the silt factor is unity, as given by the equation 57.0 = fV2/R, the grade of sand closely approximates to that.....
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3330
Bowing of bed
A small concave curvature in the bed of a channel.
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3351
Bowing of flow, or Swinging of flow
A phenomenon of unstable and non-uniform water surface in the cross section of a channel, having a flat and non-erodible bed, due to unstable streamlines set up by some change in flow (such as a transition). The water surface has a tendency to swing from one side to another due to which it is, sometimes, referred to as `swinging of flow`......
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3365
Bowing of jump
A phenomenon of formation of curved water surface of the hydraulic jump in transverse direction due to variation in flow intensity on a flat bed......
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3369
Wire drawing
A phenomenon wherein an uncontrolled drop, weir, spillway, etc., the upstream water level suddenly falls down in convex parabolic curve as the water approaches the drop. This induces excessive velocity in the spilling water......
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