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
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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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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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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3552
Syphon well-drop, or Culvert drop
A drop structure on small channels when a road crossing is combined with a fall. It consists of two wells connected by a barrel or pipe (illustrated)......
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3580
Shaft and culvert canal spillway, Combined overflow spillway and culvert, Subway, Syphon
A canal spillway formed by a vertical shaft provided near one of the banks of the canal over a canal culvert. The culvert section is enlarged beyond the junction to carry the surplus water (illustrated). In Australian usage, referred to as, `subway` or `syphon`......
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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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3756
Syphon, Inverted siphon, Irrigation syphon, Canal syphon, Syphon superpassage
1 - A structure with a closed conduit, designed to run full and usually under pressure, to transport (i) canal water under railroads, roads, various types of drainage channels and depressions, or (ii) drainage water under railroads, roads, etc. In reference to cross-drainage works on canals, this term pinpoints to the condition that the canal passe.....
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3758
Masonry syphon
A syphon, the barrel/barrels of which is/are built of masonry (bricks or plain concrete).
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3759
Steel syphon
A syphon, the barrel/barrels of which is/are built of steel.
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3760
Reinforced concrete syphon
A syphon, the barrel/barrels of which is/are made of reinforced concrete.
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3761
Pipe syphon
A syphon, barrel/barrels of which is/are made of pipe sections.
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3762
Pressure line conduit syphon
A syphon whose roof is elliptical or parabolic and whose base is horizontal or has a curved rigid floor. The choice of the shape of roof is governed by the condition of little or no uplift and high external loads......
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3763
Box syphon, or Box section syphon
A syphon having its barrel/barrels of rectangular cross section.
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3764
Syphon barrel, or Syphon duct
The closed conduit of the syphon.
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3765
Syphon trough
The portion of syphon barrel or barrels set at the deepest level.
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3766
Syphon elbow
The barrel portion in close vicinity of the bend that joins the syphon trough to the inlet or outlet. In case of vertical well-type syphon, the elbow is replaced by a well......
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3768
Syphon hump
A hump built at the exit end of an inverted siphon to guard against retrogression of bed levels in the channel downstream of the syphon (illustrated)......
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3769
Syphoning
Passing or conveying water by means of an inverted siphon.
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3865
Syphon culvert
A culvert built with its barrel below the ground level in the vicinity.
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