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
841
Drainage area, Drainage basin, River basin, Catchment area, Catchment basin, Catchment, Watershed
The area from which a lake, stream or waterway and reservoir receives surface flow that originated as precipitation.
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842
Experimental basin, or Experimental watershed (USA, AU)
Drainage basin or catchment area in which natural conditions are deliberately modified and in which the effects of these modifications on the hydrologic cycle are studied......
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843
Water parting, Drainage divide, Divide, Watershed divide, Watershed boundary, Topographic divide
A summit or boundary line separating adjacent drainage basins.
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851
Yield of drainage basin, Annual yield of drainage basin
Total volume or flow from a drainage basin for a stipulated period of time, e.g. ‘annual yield of drainage basin’ is the mean annual runoff......
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904
Basin recharge
That portion of the storm rainfall that is required to satisfy the demands of interception, depression storage, and soil moisture. It is the difference between rainfall and runoff and is often referred to as loss......
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905
Watershed leakage
The underground flow of precipitation that through fissures and water-bearing strata to an outlet either in a nearby or a remote drainage basin or directly to the sea (illustrated)......
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960
Basin
Area drained by a river, lake or its tributaries (hydrology) or a level plot or field, surrounded by dikes, that may be flood irrigated (irrigation)(recharge)......
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965
River basin management, Watershed management, or River management
Planned use of river basins in accordance with predetermined objectives.
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966
River basin model, or Watershed model (US)
Numerical model simulating major hydrologic processes occurring in the catchment area of an entire river system.
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967
River regime
The flow characteristics of a stream with respect to velocity, volume, form of and alterations in the channel, sediment-transporting capacity and the amount of material supplied for transportation......
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972
Ungauged basin, or Ungaged watershed (US)
Drainage basin of which no regular hydrological records are available.
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1023
Artesian basin
A geological structural feature or combination of such features in which water is confined under artesian pressure.
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1029
Catchment area, or Basin (of an aquifer)
The surface area composed of the intake area of an aquifer and all other areas that contribute surface water to the intake......
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1113
Groundwater management
Planned use of groundwater in accordance with predetermined objectives.
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1129
Groundwater basin
Physiographic or geological unit containing at least one aquifer of significant areal extent.
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1249
Watershed
1   The entire drainage area that contributes water to a system; the line of separation between adjacent water catchment areas. 2   See 5059......
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1250
Catchment basin
A unit watershed; the entire area from which drainage is received; a natural water collecting area supplying water to a single waterway......
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1316
Poised river, or Stable stream
A river or stream which, as a whole, maintains its slopes, depths and channel dimensions without any noticeable raising or lowering of its bed. Such a river may temporarily suffer from a geological point of view, but for practical engineering purposes can be accepted as one of considerable stability......
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1317
Alluvial river
A river formed in alluvium, typically transporting sediment similar to that comprising its bed and banks, and characterized by the processes of aggradation and degradation (scour)......
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1318
Eroding river, or Degrading river
A river continuously eroding its bed or banks.
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1319
Depositing river , or Aggrading river
A river continuously depositing the sediment load transported by it, on its bed or banks.
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1323
Incised river
A river which has cut its channel through the bed of the valley floor, as opposed to one flowing on a floodplain.
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1325
Braided river
A river with an extremely wide and shallow channel, when the normal river flow passes through a number of smaller interlaced channels separated by bars or shoals. In such rivers, there is a little tendency to meander, though local meandering in the minor channels may generally occur (illustrated)......
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1327
Tidal river
A river in which flow and water surface slope are affected by tides. In some rivers, the effect may extend a hundred miles or more upstream from the mouth, sufficient to even temporarily reverse the direction of flow of the stream......
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1331
Young river
In geological terms, a river is young when it is actively eroding its channel.
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