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
1478
Canalization
The training of a river for navigation by developing a waterway of required depth either by construction of a series of locks and dams or by straightening and confining the flow when the slope is sufficiently flat......
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2213
Head of a canal
The point where the supply is diverted into a canal from a reservoir, river, or parent canal.
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2555
Inverted filter, or Protective filter
A layer or layers of pervious or semipervious material graded and arranged to provide drainage and prevent movement of soil particles due to flowing water......
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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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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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2993
Canal
A manmade or artificial channel for carrying water that can be used for navigation purposes, or for conveying water for irrigation, domestic or industrial purposes, etc......
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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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3004
Slightly sinuous canals
Canals having a degree of curvature in alignment typical of slightly undulating topography.
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3005
Moderately sinuous canals
Canals having a degree of sinuosity in alignment that is typical of moderately rolling topography.
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3006
Very sinuous canals
Canals having a condition in alignment which is typical of canals in foothills or mountainous topography.
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3178
Rabi and monsoon sections of a canal
These terms are used in Indian sub-continent. The `rabi section` is the cross-sectional area of a canal in which assured supply is available for maturing two-season and rabi crops only. The rest of the cross section is the `monsoon section` in which water may be supplied when available, in the monsoon and rabi seasons without any assurance......
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3208
Canal land width, or Right-of-way
The width of land occupied by or acquired for a channel section including its inside berms, banks, outside borrow-pits, if any, spoil banks, if any. In Australia, this is termed `reserve`, if the land is acquired by the authority, and `easement`, if the land remains the property of the owner, but the permission to use it for carrying water has been.....
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3300
Accumulative escaping power of canal
Progressive totals of discharges at the end of each reach of the channel from the first reach downstream. The design section must make provision for this discharge in addition to calculated theoretical discharge......
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3316
Parent canal
With reference to any canal, the canal which feeds it with water supply.
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3317
Offtake canal
A canal that takes water from another canal.
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3382
Distributary canal
A second order canal that originates from the main irrigation canal and feeds into tertiary canals or farm channels.
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3441
Distributary head, Secondary canal intake, or Lateral turnout
Offtake regulator at the head of a distributary, lateral or secondary canal.
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3442
Sub-minor head, or Quaternary canal intake
Offtake regulator at the head of a sub-minor or quaternary canal.
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3525
Fall, Drop, Drop structure, Fall structure, Canal weir
1 - A structure designed to secure the lowering of the water surface in a channel in a short distance, and the safe destruction of the liberated surplus energy. In Egypt, a fall or drop structure with water flowing over it and having its surface subject to atmospheric pressure is called a `canal weir`. 2 - The terms `fall` or `drop` also refer to t.....
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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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3557
Fayoum canal weir
A type of vertical drop structure in use in Fayoum Province of Egypt. It has a raised crest of 0.50 metre width, the drop wall on the upstream is vertical and on the downstream has a batter of 1/2 : 1. The downstream floor is protected by brick floor (illustrated)......
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3568
Scouring escape, Sediment escape, Silt escape, Canal Scouring sluice
An escape built for sluicing sediment from a canal.
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3574
Canal overflow spillway
The overflow weir type of canal spillway.
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3575
Canal spillways
A by-pass structure, usually designed to operate automatically, to discharge surplus and waste water into a waste channel above a set elevation and, in some types, also to wash out ice, weeds and other floating materials. If a spillway is used as protection for a power plant or similar installation, it may be required to pass the entire flow. Funct.....
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