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
1538
Lower bank
The portion of a bank below low water level often extending quite a distance horizontally to the river bed. See 1537.
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1539
Direct bank protection
Kind of works on the bank itself, such as slope protection of embankment and upper bank and toe protection of lower bank against erosion, and grading of sloping surface or provision of drainage layers, to ensure stability against seepage and saturation......
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1542
Indirect bank protection
Kind of works that are not constructed directly on the banks but in front of them with a view to reduce the erosive force of the current either by deflecting the current away from the banks or by inducing deposition in front of them......
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2066
Bank
The rising ground bordering a lake, river or sea; of a river or channel, designated as right or left as it would appear facing downstream......
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2118
Peat bank
A place from which peat is cut.
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2222
Wing levee, Afflux bund, or Afflux bank
An embankment or dike designed to prevent the outflanking of the abutment by flood waters passing round the end of the weir, extending up to, but not across, the whole of the river flood plain......
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2356
Earth dam, or Embankment dam
A barrier made of earth, clay, sand or sand and gravel, or a combination of these or of the earth and rock.
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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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2395
Active storage
The volume of the reservoir that is available for use either for power generation, irrigation, flood control or other purposes. Active storage excludes flood surcharge. It is in fact the reservoir capacity less inactive storages. The terms useful storage or usable storage or working storage are sometimes used instead of active storage although not .....
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2396
Flood control storage
Storage capacity provided in a reservoir to absorb or retain flood water in full or part. Water stored during floods is usually released as rapidly as the downstream channel capacities permit......
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2397
Flood storage
The part of the active storage used exclusively for flood control. `Flood storage` should not be confused with `flood surcharge`......
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2400
Carry-over storage
Storage of inflowing water during surplus years for making up deficiencies in dry or lean years.
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2401
Seasonal storage
1 - Storing of water during high inflow periods and supplying it during low inflows. 2 - It also refers to the quantities of seasonal storage......
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2402
Annual storage
1 - The difference of storage in a reservoir at the beginning and end of a year of reservoir operations. 2 - The difference between the maximum and minimum volumes of storage in a reservoir over a year of reservoir operation......
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2403
Storage increment (reservoir)
Difference between the inflow and outflow in the reservoir.
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2404
Storage cycle
A period at the beginning and end of which the reservoir contents are the same. The period may vary from a few hours to years depending upon inflow and outflow rates......
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2405
Reservoir capacity, Gross capacity reservoir, Gross storage, or Storage capacity
The gross capacity of a reservoir from the river bed upto the retention water level. It includes active, inactive and/or dead storages......
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2406
Bank storage, or Ground storage
1 - Water that has infiltrated from a reservoir into the surrounding land area where it remains in storage until the water level in the reservoir is lowered. 2 - See 861......
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2415
Dead storage level
Level of a reservoir corresponding to the lowest outflow level beyond which the water of the reservoir can not be let off......
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2416
Normal water surface elevation, Normal water level, Conservation water level, Storage level, Normal pool level, or Conservation storage level
The reservoir water surface level corresponding to conservation storage.
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3198
Non-inspection bank
Bank of a canal which does not provide for an inspection path.
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3199
Spoil bank
A bank composed of waste earth which has been excavated (illustrated).
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3205
Boundary bank
The bank constructed out of the excavated material of the boundary trench and the outer toe that marks the limit of right-of-way easement (illustrated)......
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3487
Floating guide bank system, or Stream directing system
A sediment or silt exclusion device placed in the river in front of the entrance of a canal, comprising separate sections, in one arrangement, hinged together each with four partially submerged gates connected at their top by an overhead truss at an inclination to the river current. The gates divert the surface water towards the canal and the botto.....
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