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
322
Topographic maps, or Relief maps
Maps giving complete description of certain areas and showing, to larger scale, the geographical position of the natural features and the works of man. The relief is usually represented by contours......
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582
Centimetre of water
img:equations//566_595_e.jpg
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597
Head of water in metres
img:equations//596_630_e.jpg
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598
Head of water in metres
img:equations//596_630_e.jpg
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681
Surface water hydrology
The branch of hydrology dealing with surface waters including the presence or absence of water on or above the earth’s surface......
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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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721
Hydrological year, or Water year
A continuous twelve-month period selected for the presentation of streamflow data during which a complete annual stream-flow cycle occurs and therefore carryover or storage changes are minimal. .....
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729
Headwater, or Headwaters
The upper reaches of a stream near its source.
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812
Slush, or Watery mud
Snow or ice of the ground that has been reduced to a soft watery mixture of rain by warm temperature, and/or chemical treatment......
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814
Snowmelt, or Snow water
The water resulting from the melting of snow. It may evaporate, seep into the ground, or become a part of runoff.
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815
Water-equivalent of snow, Snow water equivalent
The depth of water that would result from the melting of the snow cover over a given area.
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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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844
Phreatic divide
An underground divide that fixes the boundary of the area that contributes groundwater to each stream system (illustrated)......
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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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853
Storm runoff or Storm-water runoff
That portion of the total runoff from storm rainfall that reaches the point of measurement within a relatively short period of time subsequent to the occurrence of rain. It essentially excludes the base flow......
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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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859
Drainage modulus, or Drainage coefficient
1 -The runoff from a drainage district expressed in depth units removed from the area in 24 hours. 2 - See 5242.
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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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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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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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972
Ungauged basin, or Ungaged watershed (US)
Drainage basin of which no regular hydrological records are available.
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973
Water balance, or Water budget
A systematic review of inflow, outflow and changes in storage as applied to a watershed or body of water.
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