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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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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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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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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1129
Groundwater basin
Physiographic or geological unit containing at least one aquifer of significant areal extent.
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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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2386
Reservoir basin
The drainage basin feeding the reservoir.
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2387
Safe yield of reservoir basin, or Safe yield of catchment
The annual runoff flowing from the basin into the reservoir that can be depended upon for utilization.
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2598
Factor of safety
An index of stability of a structure with respect to its sudden failure.
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2784
Cup basin type water seal
A water seal made effective by dipping the lower limb of the hood into a cup-like basin provided on the downstream end (illustrated)......
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2804
Stilling basin, Tumble way, Hydraulic energy dissipator, Water-stilling device, or Energy dissipating device
A structure below a spillway, chute or drop in which all or part of the energy dissipation occurs and the kinetic energy is converted into turbulent energy......
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2806
Hydraulic jump basin, or Hydraulic jump dissipator
A stilling basin in which energy is dissipated by the hydraulic jump principle.
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2807
Free jet stilling basin, or Free jet basin
A stilling basin where the water jet emerging from an outlet discharges above the tail water level in air and then plunges into the basin thus dissipating energy largely by turbulence (illustrated)......
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2809
Free jet chute basin
A stilling basin in which the flow enters through a free jet chute and energy is destroyed by the hydraulic jump principle......
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2810
Jet diffusion basin, or Jet diffusion stilling basin
A stilling basin where the energy is dissipated by the jet diffusion principle to reduce the length of the basin normally required by the hydraulic jump (illustrated)......
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2811
Submerged jet diffusion stilling basin
A stilling basin where the entering jet is completely submerged below the tail water level and its energy is dissipated by the jet diffusion principle......
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2812
Hump stilling basin, or Hump basin
A stilling basin with a hump in the basin floor provided to spread the jet and permit the formation of a stable hydraulic jump when the centre line of a jet emerging from an outlet is below the stream bed elevation but not too far to be completely submerged by the tail water. (illustrated)......
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2813
Impact stilling basin, or Impact basin
A type of stilling basin to serve the need for relatively smaller basins for the energy dissipation independent of tail water variations or any tail water at all (illustrated)......
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2814
Roller type stilling basin
A stilling basin having an end sill above which the surface roller and below the ground rollers cause energy dissipation; the tail water depth being usually greater than that required for hydraulic jump (illustrated)......
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