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
363
Volume
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367
Specific volume
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405
Volume
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415
Volume
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545
Volume
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1709
Apparent specific gravity, Volume weight or Bulk specific gravity
The ratio of the mass of a unit or given volume of oven-dry soil, air space included, to the mass of an equal volume of water......
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2441
Volume (dam)
Space occupied by all materials in the dam. The volume of a dam includes the main fill, the riprap and the impervious blanket......
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4037
Total demand (in discharge and in volume)
Sum of the discharges (or volumes) requested by irrigators downstream of any point in a canal system, at the head of a transport or delivery canal or at the head of an individual field......
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4042
Regulation with volume control
Method of regulation when the volume of water in the reach may vary for technical reasons but remains under the control of the operator......
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4045
Operation of a canal with constant volume
Method of operation aimed at maintaining constant, under all conditions of steady flow, the volume of a canal reach situated between two gates......
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4046
Operation of a canal with volume control
Method of operation where the volume of a canal reach situated between two gates is controlled so as to take into account inflows and withdrawals (by drawing out or pumping) which are variable in time......
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4802
Volumetric valve
A valve that can deliver a predetermined volume of water, within a certain range of discharges and pressures.  Volumetric valves can function individually or in sequence, in which case discharges can be sequenced from set to set of an irrigation system......
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5025
Performance of a collective system in terms of discharges (or volumes) delivered
The criterion is given by the ratio :
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5624
Volume change (of concrete)
The expansion and contraction of hardened concrete resulting from wetting and drying or temperature variations. May produce various types of undesirable conditions in concrete......
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6228
Constant volume control, or operation
A canal operation or control method that consists in maintaining a relatively constant water volume in each canal pool.
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6233
Controlled volume operation
A canal operation method when the water volume within one or several successive pools is varied in a prescribed manner, depending on time-variable factors, such as anticipated water demand, preferred off-peak pumping for canal supply, etc......
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7952
Flood volume
The overall volume of a flood wave passing a certain point in relation to the adopted basic-stage flood.
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9135
Volumetric water rate
The charge levied according to the quantity of water actually delivered to the outlet or turnout.
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