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
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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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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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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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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1427
Concave (river) bank
The bank on the outside of a river bend. The radius of a concave bank is generally greater than that of the convex bank.
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1428
Convex (river) bank
The bank on the inside of a river bend (vs. concave bank).
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1455
Bankful discharge
Discharge corresponding to the state at which the river berms are about to be submerged.
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1484
Groyne, Groin, Bankhead, Spur, Spur dike, Transverse dike, Jetty
1 - A structure built from the bank of a river in a direction transverse to the current. The groynes may be permeable, semi-permeable or impermeable. 2 - See 3479 and 8028......
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1500
Fending groyne, or Bankhead
Groyne which fends the current of flow of water and prevents erosion. Denehy`s groyne is an example of this type (illustrated)......
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1507
Stem bank, or Shank
Embankment connecting a groyne head to the river bank or marginal bund (illustrated).
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1524
Retired embankment
An embankment built at a distance from the river edge behind an existing embankment as a second line of defence. (illustrated)......
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1526
Bank sluice
An opening controlled by shutters or gates in the marginal embankment which are opened during high floods.
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1527
Guide bank, or Bell`s bund
A protective or training embankment constructed at the side of a weir, bridge, etc., to guide the river into the waterway in the structure; named after Mr. J.R. Bell who designed such bunds (illustrated)......
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1533
Bank protection
1 - A kind of engineering work which aims at protecting the banks of a river, or slopes of embankments along it, from erosion by the current of flow. 2 - See 7986......
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1534
Bank revetment
A type of bank protection continuously covering the entire slope of a bank or an embankment, including the portions extending far into the river bed, to protect the bank from erosion. Bank revetment somewhat resembles canal lining, the difference being that the latter aims at stopping or lessening the seepage of water from a canal into the ground, .....
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1535
Bank paving
The part of revetment extending from the mattress to the top of the banks. See 1544.
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1537
Upper bank
The portion of the river bank that is located above the low water level and below the foreshore level. See 1538.
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