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
299
Full section
Section when the cutting plane passes entirely through an object.
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955
Bankfull, or Bankfull stage
The stage attained by a stream when flowing at a capacity above which the natural banks overflow.
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1441
Meander, or Full meander
Two consecutive loops in a river, one flowing clockwise, the other anti-clockwise (illustrated).
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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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2411
Retention water level, Top water level, Normal top water level, Full supply level, or Normal water level
The lowest crest level of the sill for a reservoir that has a fixed overflow sill. In case the outflows are wholly or partially controlled by movable gates, syphons or other means, the maximum level to which water can rise under normal condition excluding the provision for flood discharge in the retention water level......
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2880
Submerged-face gate, or Culvert gate
A gate that closes an opening having a wetted perimeter consisting of all four sides, the free surface level of the retained water being above the top of the gate opening......
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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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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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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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3211
Maximum flow line, Full supply line, Designed maximum flow line, Designed full supply level, Actual maximum flow line, or Actual full supply line
1 - The line describing the water surface elevation under the steady flow conditions of maximum normal flow or discharge. If after construction, the prevailing maximum flow line in the field differs from that designed, the maximum flow line is further classified for the sake of distinction as `designed maximum flow line` and `actual maximum flow li.....
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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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3310
Full supply discharge, Authorized discharge, Designed full supply discharge, or Maximum normal flow
The flow in a canal corresponding to the full supply level.
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3311
Full supply level
Water level in a canal running with full supply discharge.
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3313
Full supply depth
Depth of water in canal corresponding to the full supply 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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