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
739
Ice cover
Ice on the water surface of a lake or stream.
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740
Ice fringe
Ice deposit of moisture, not hoarfrost, exuded from stems of plants.
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741
Sheet ice
Ice formed in a smooth thin layer on the surface of the water in lakes and streams by the coagulation of frazil ice during rapid freezing.  Sheet ice attached to the stream margins is known as border ice, while moving sheet ice is known as skim ice or pan ice......
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742
Cat ice, or Shell ice
An unbroken ice sheet on a body of water under which the water level has receded, so that a cavity is formed between the water surface and the ice......
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743
Slush ice
A floating agglomeration of flocs of frazil ice.
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744
Ice storm
Storm characterized by occurrence of a glaze.
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745
Glaze, Clear ice, Black ice or Freezing rain
A generally homogeneous and transparent ice layer deposited by drizzle or rain that is supercooled on surfaces having temperature below  0oC ; it may also be produced by non-supercooled drizzle or rain falling on the surface having temperature below 0oC and starting to freeze at once.  Rime ice is softer and less transparent than glaze......
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746
Subsurface ice, or Interstitial ice
Ice that occurs below the surface of the lithosphere. It may be formed by the freezing of saturated or unsaturated rock or soil, or by the covering of a bed of surface ice or snow by a mantle of rock debris......
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747
Anchor ice
Ice formed below the surface of a stream  on underwater objects. It is caused by adherence of frazil ice crystals or, in the case of very turbulent streams, by supercooled surface waters being transported to a considerable depth......
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748
Frazil ice
Fine spicules of ice in suspension in water caused by supercooling and nucleation at the air-water interface.
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749
Ice gorge, or Ice jam
A temporary dam that restricts flow. Caused by a stationary accumulation of fragmented ice or frazil.
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1033
Interstice, or Void (in a rock, or soil)
A space in a rock or soil, that is not occupied by solid matter.
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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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1530
Crevasse, or Crevice
A breach in a levee or river embankment.
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1835
Capillary interstice
An interstice small enough to produce appreciable capillary rise.
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1836
Subcapillary interstice
An interstice smaller than a capillary interstice in which molecular attraction spans the entire space and water is held immovable against the force of gravity by adhesion......
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2063
Tidal outlet, or Tidal sluice
A structure to control the outflow of water.
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2234
Undersluices, Sliding sluices, or Scouring sluices
1 - Gated openings provided in a weir, dam or a barrage having its sill at a level lower than the remaining portion to discharge water as and when required. Undersluices are also known as sliding sluices in main dams where water is discharged at a level much below the reservoir. These can be used to eject detritus material during periods of high fl.....
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2235
Undersluices pocket, Pocket, or Scouring sluices pocket
The portion of river channel upstream of the undersluices bounded by the divide wall, inlet of the head regulator structure and the undersluices (illustrated)......
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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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2244
Silt excluding devices
Devices and controls such as excluders, regulation and orientation of the head regulators to exclude entry of coarse silt into the offtaking channels......
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2378
Sluice dam
A dam having sluice openings.
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2524
Sluice
1 - A conduit for carrying water at high velocity that can if desired be closed by a gate. 2 - An opening in a structure for passing debris. 3 - To cause water to flow at high velocities for wastage, for purposes of excavation, ejecting debris, etc......
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