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
685
Geohydrology, Hydrogeology or Groundwater hydrology
The branch of hydrology that deals with groundwater, its occurrence and movements and its replenishment and depletion; the properties of rocks that control groundwater movement and storage and the methods of investigation and utilization of groundwater......
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737
Killing frost, Ground frost (UK)
A freezing condition sufficiently injurious to vegetation to end the growing season. In the United Kingdom this is considered to have occurred when a minimum thermometer exposed to the sky and just above the grass surface records a temperature of – 0.9oC (30.4oF) or below......
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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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855
Subsurface flow, or Underground flow
The phenomenon of water flowing beneath the earth`s surface.
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858
Groundwater runoff
That part of the runoff which has passed into the ground, becomes groundwater, and is discharged into a stream channel as spring or percolation water (illustrated)......
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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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877
Ground rainfall
The part of rainfall which actually reaches the ground, i.e. the total rainfall minus interception by vegetation.
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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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975
Groundwater province
An area characterized by a general similarity in the mode of occurrence of groundwater.
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976
Subsurface water, Underground water, or Subterranean water
All water that occurs beneath the surface of the earth (i.e. within the lithosphere).
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977
Groundwater
The subsurface water that occurs in the zone of saturation.
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988
Capillary groundwater, or Fringe water
Water in the capillary fringe.
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996
Groundwater table
The upper limit of the zone of total saturation in an aquifer.
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997
Free groundwater, Phreatic water, or Non-artesian water
Groundwater having a water table, as opposed to groundwater confined by an impervious or semipervious formation at its upper boundary......
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998
Confined water, or Confined groundwater
Groundwater limited above by an impervious formation.
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999
Perched water, or Perched groundwater
Groundwater of a limited aquifer embedded in different depths but lower than Verkhovodka, on small impermeable or relatively impermeable lenses......
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1000
Semiperched groundwater
Groundwater that has a greater pressure head than an underlying body of groundwater, from which it is not separated by any unsaturated rock......
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1001
Fixed groundwater
Water held in saturated material with interstices so small that it is permanently attached to the pore walls or moves so slowly that it is usually not available as a source of water for pumping......
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