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
727
Channel
1 - A natural or artificial but clearly distinguishable waterway which periodically or continuously contains moving water, or which forms a connecting link between the two bodies of water. 2 - The deep portion of a river or waterway where the main current flows. 3 - The part of a body of water deep enough to be used for navigation through an area o.....
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796
Totalizer, or Storage rain gauge
A type of rain gauge which totalizes the quantity of precipitation.
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818
Snow storage
Storage of water on a drainage basin in the form of snow and ice.
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860
Depression storage, or Pocket storage
The volume of water which is required to fill natural depressions, large or small, to their overflow levels (illustrated)......
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861
Bank storage
Water absorbed and stored in the bed and banks of a stream, lake, or reservoir as the surface level of the water body rises and returned in whole or in part as the surface level falls......
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862
Channel storage, or Temporary storage or Wedge storage
1 – The additional volume of water contained in a channel reach as a result of inflow to the reach being greater than the channel can discharge immediately (Illustrated). 2 – See 5372......
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919
Valley storage, Lateral storage
The natural storage capacity or volume occupied by a stream in flood after it has overflowed its banks. It includes the quantity of water within the main channel (channel storage) and that which has overflowed its banks (lateral storage)......
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954
Channel capacity
The maximum flow which a given channel is capable of carrying without overtopping its banks.
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958
Detention storage
The volume of water that can be stored temporarily, as during a flood period; usually applies to a volume in a reservoir but may be applied to storage volume in a channel or on the ground surface......
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961
Headwater storage
Works designed to store or otherwise retain  runoff, where it originates or as near thereto as practicable, to  reduce the crest downstream......
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974
Groundwater storage
Water stored beneath the ground surface in the zone of saturation.
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1047
Storage coefficient of an artesian aquifer
A dimensionless fraction representing the volume of water released from a vertical prism of the aquifer having a base of unit area and a height equal to the thickness of the aquifer when the piezometric surface falls one unit of height......
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1054
Channel spring
Groundwater discharge to the soil surface caused by the depression of a thalweg in an erosion or alluvial plain (See 1057)......
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1098
Coefficient of storage
The volume of water discharged from each vertical column of aquifer with a basal unit area as the water level falls one unit depth. In an unconfined aquifer, the coefficient of storage is essentially equal to the specific yield......
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1155
Open conduit, or Open channel
Any channel, natural or artificial, in which water flows with a free surface.
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1362
Channel rugosity
A measure of the roughness of the surface over which water must flow.
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1423
Channel line
The route of the strongest flow of a river.
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1424
Axis of channel
The line joining the middle points of the water surface of a channel in successive cross sections.
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1477
River training, or Channel regulation
1. Engineering structures (including artificial plantations) with or without the construction of embankment, built along a river or a section thereof, to direct or lead the flow into a prescribed channel. 2. The modification of a river, by man, to allow or enhance navigation by developing a waterway of required depth either by construction of a ser.....
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1483
Channelling, or Channelization
1 - Training of low discharge of the stream to flow through a small channel or canal to bring about an improvement in its alignment, velocity of flow and discharge coefficients, etc. 2 - The defining of the course of a stream through a swamp or other area, where natural flow is ill-defined, by cutting of a channel or canal to carry the stream flow......
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2236
Scouring sluice channel, or Undersluice channel
The portion of a river channel leading water to the undersluices and away from it to join the river downstream of the weir or barrage......
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2237
Downstream undersluice channel
A portion of the river or a channel made in the river that confines the erosive effects of the water discharged through the sluice gates that again joins the river downstream......
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2238
Upstream undersluice channel, or Upstream scouring sluice channel
The portion of the river channel leading water to the undersluices and limited up to the sill of the undersluices. `Pocket` is only a part of the upstream undersluice channel......
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2384
Conservation reservoir, or Conservation storage reservoir
A reservoir, impounding water for useful purposes such as municipal supply, power, production, irrigation or recreation.
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2394
Dead storage capacity, or Dead storage
The storage volume of a reservoir measured below the invert level of the lowest outlet or the minimum operating level. It is also termed Inactive storage......
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