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
228
Double-sampling plan
In order to give the lot a second chance, double sampling is often adopted. To begin with, a relatively small sample, smaller than in the single-sampling plan, is taken and critical values for acceptance and rejection computed. If the sample produces less defective units than the acceptance critical value, the entire lot is accepted; if it produces.....
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926
Double mass curve
Plot of successive accumulated values of one variable against the contemporaneous accumulated values of another variable......
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1223
Double float
A body of a slightly negative buoyancy that moves with the stream at a known depth and whose position is indicated by a small surface float from which it is suspended......
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1522
Outlet
1 - Term applied on the Mississippi (i) to large channels in or near the delta which diverge from the main river and deliver into the sea, really secondary mouths, (ii) to lateral escapes which spill over the natural banks into depressions or basins, (iii) to manmade escapes in the same manner, and (iv) to crevices through levees. 2 - See 3660, 654.....
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1741
Double layer
Arrangements of two oppositely charged ions in layers near the surface of a clay particle.
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2063
Tidal outlet, or Tidal sluice
A structure to control the outflow of water.
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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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2253
Siphon weir
A weir operating on the siphon principle. The siphonic arrangement is usually fitted in gravity weirs.
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2340
Double wall buttress, or Hollow buttress
A buttress made of thin concrete sections duly stiffened in between by stiffeners.
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2527
River sluices, Waste outlets, or Dewatering outlets
Sluices provided near the river bed to empty the reservoir or to discharge muddy water during floods and as also to serve as an auxiliary spillway......
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2528
Sluicing outlets
Outlets in the body of the dam used for ejecting out settled material from the reservoir.
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2529
Service outlets
Outlets provided in the body of the dam that allow withdrawal of water for use. These are also provided with trash racks......
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2706
Siphon-pit setting
A type of turbine setting used when the head is insufficient to provide a permanent water seal to the turbine. The water passes through the turbine under siphonic action (illustrated)......
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2721
Throttled surge tank, or Restricted orifice surge tank
A type of surge tank with the inlet to the surge tank being narrowed for speeding up pressure change (due to greater head loss at the inlet) and quickening the damping of oscillations (illustrated)......
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2724
Outlet works
A collective term for all components of the means system provided at a dam for releasing water from a reservoir at a controlled rate. The term includes such items as the trash barrier, the conduits, the emergency and regulating gates or valves, the gate chamber or valve houses and the stilling basin. The term excludes spillways......
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2768
Spillway outlet channel
A channel connecting the stilling basin or the downstream end of the spillway or the stilling basin of the spillway either to the parent stream or another drainage......
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2769
Siphon spillway
A spillway operating on the siphon principle.
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2770
Siphon, or Syphon
1 - A tube, pipe or a hose through which liquid can be moved from a higher to a lower level over an intervening (higher) barrier.  The movement is caused by atmospheric pressure forcing the liquid through the upstream portion of the siphon while the weight of the liquid in the downstream leg causes continuous downward flow. Because the upper part r.....
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2771
High head siphon
A siphon acting under a difference in water level of more than the barometric height of the water column, i.e. 10.33 metres......
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2772
Low head siphon
A siphon acting under a difference in water level of less than the barometric height of the water column, i.e. less than 10.33 metres......
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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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2774
Siphon duct, or Siphon barrel
The annular space between the dam (body wall) and the hood (illustrated).
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2785
Tilted outlet type water seal
A water seal formed by providing an improvised tilted outlet pipe on the downstream end (illustrated).
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2787
Baby siphon type water seal, or Maramsilli baby siphon type water seal
A water seal provided by a baby siphon which by virtue of being at a lower level gets primed earlier and its issuing jet itself seals the downstream end of the siphon duct. A siphon employing this device is also called a `Maramsilli baby siphon` (illustrated)......
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2788
Baby siphon, or Maramsilli baby siphon
A smaller siphon operating at a lower level than the main siphon in the Maramsilli baby siphon. Sometimes, the baby siphon is also referred to as `Maramsilli baby siphon` (illustrated)......
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