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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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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1674
Prismatic structure, Columnar structure
Structure with vertically elongated aggregates in the shape of prisms; where the prisms are rounded at the top, they are designated `columnar`......
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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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