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
575
Barrel
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576
Barrel (dry)
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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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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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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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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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2789
Auxiliary siphon type water seal
A water seal created by providing a baby siphon placed either in front or by the side of the main siphon. The two siphons are connected through a pipe conduit......
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2795
Battery of siphons
A number of siphons installed close to each other.
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2796
Volute siphon
A siphon consisting of a bent pipe (barrel), the vertical portion is usually funnel-shaped at the top. Volutes are placed on the funnel or outside the vertical pipe near its top and due it is to this that it owes its name. The funnel is covered by a dome placed at some distance. The dome is supported by a cylindrical drum resting on pillars leaving.....
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2802
Priming siphon
A siphon device usually of smaller capacity installed with a main siphon or battery of siphons to reduce priming depth in the latter......
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3155
Well siphon
A siphon in which wells are provided at each end of the siphon.
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3459
Closed conduit offtake regulator, Box offtake regulator, or Barrel offtake regulator
A regulator consisting of buried single or multiple barrel pipe or box sections with gate control at its upstream end and a suitable transition into tail water at the outlet......
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3526
Closed conduit drop, Closed conduit fall, Pipe drop, or Barrel drop
A fall in which the lowering of the level of water is conveyed through a pipe or pipes. It generally consists of an inlet transition, a pipe or barrel and an outlet transition or baffled outlet. Also known as `pipe drop` or `barrel drop` (illustrated)......
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3582
Siphon spillway (canal)
A spillway operating on siphonic principle placed in the bank normal to the flow of the canal or in the canal downstream of the head race channel of a hydro-electric plant......
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3712
Double orifice module outlet, or Siphon module outlet
A Neyrpic module provided with two metallic covers forming a syphon. This outlet works as a semi-module as long as upstream water level does not touch the bottom edges of the two metallic covers. Then, with further rise in upstream water level it works as a semi-module orifice till the siphon primes and flow through which impinges on the jet. This .....
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3724
Pipe outlet, Barrel outlet, Free fall pipe outlet
An outlet with face and tail walls and a pipe or masonry barrel (circular, rectangular or square) conveying the water from the supply to the watercourse. When it discharges freely into the air, it works as a semi-module as its discharge is then independent of the water level in the watercourse......
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3745
Trough aqueduct, Timber trough aqueduct, Masonry trough aqueduct, Concrete trough aqueduct, Steel trough aqueduct
A form of aqueduct in which the earthen banks of the canal are discontinued through the aqueduct and the canal water is carried in a masonry, concrete, timber or steel trough, usually flumed. The sides of the trough are connected on either side of the work to earthen banks of the canal by means of wing walls. According to the material of the trough.....
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3749
Irrigation pipe aqueduct, Pipe aqueduct, Pipe flume
An aqueduct in which the canal water is taken in a pipe over the drainage, natural stream, depression or hollows. Also called `pipe flume`......
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3751
Syphon aqueduct, Drainage syphon, Cross drainage culvert
A cross-drainage work in which the irrigation canal is carried over the drainage channel or natural stream but the bed level of the drainage channel or natural stream is depressed below its natural or normal level while passing under the canal bed. The drainage or stream water passes through the syphon under pressure except at very low discharges w.....
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