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
440
Discharge and yield
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552
Discharge and yield
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896
Evaporation station
A station set up on the surface of a water body or on land for making evaporation measurement.
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1045
Artesian discharge
The flow of water from a well that penetrates an artesian aquifer.
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1156
Discharge, or Rate of flow
The volume of water that flows past a particular cross section of a channel or conduit in a unit of time.
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1160
Mean monthly discharge
Discharge observed or interpolated and averaged over a calendar month.
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1161
Discharge coefficient
The ratio of the actual discharge to the discharge calculated according to a theoretical formula.
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1162
Stage-discharge relation, Rating curve (coll.), Discharge rating curve, or Station rating curve
The relation between the discharge and its corresponding stage at a given  stream cross-section.  It may be expressed graphically, as a table or as an equation......
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1166
Residual discharge mass curve, or Residual discharge mass diagram
A plot of the year-to-year residual departure of discharge from the arithmetic average accumulated for the period under consideration......
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1168
Stream gauging
The process of determining the discharge of water in an open channel, commonly as the product of flow velocity and cross-sectional area.  See also 1169......
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1169
Dilution gauging, Chemihydrometry
Methods of measuring the flow of water by introducing a constant flow of a chemical or radioactive solution of known concentration for a sufficient period of time at one section of the water channel and then by determining the resulting degree of dilution of this solution at another downstream section......
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1170
Salt-dilution gauging
A method for the measurement of flow of water based upon the nearly linear relation between the concentration and the electrical conductivity of a salt solution, which makes it possible to determine the degree of dilution by integrating a conductivity time graph......
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1171
Cloud-velocity gauging, Allen`s method of velocity gauging, Colour-velocity gauging
A method of determining the velocity of a slug of dye between two stations in the channel. This velocity, assumed to be the mean velocity of flow, multiplied by the cross-sectional area of the channel, gives the discharge. `Allen`s method` and `colour-velocity method` are different forms of cloud-velocity gauging......
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1172
Float gauging
Estimation of the average velocity of water in an open channel by timing the rate of movement of weighted floats in order to determine discharge......
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1173
Gauging station
A selected site on a stream equipped and operated to furnish basic data from which systematic records of discharge may be derived......
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1174
Discharge site, Gauging site, or Velocity-area gauging station
A location on a stream where gauge, velocity and cross-sectional areas are measured, or other gauging methods are deployed, in order to determine the discharge......
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1175
Dosing station
In chemical gauging, the station on the stream from where a chemical solution is fed into the water.
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1176
Sampling station
In chemical gauging, the station downstream of the dosing station from which samples of water are taken to find out the concentration of the diluted chemical solution with a view to determining the discharge......
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1196
Discharge section line, Gauging section, or Metering section
The cross-section in which depths and velocities of water are measured between two points located one on each bank of a channel (illustrated)......
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1353
Sediment discharge
The mass or volume of sediment passing a stream cross section in a unit of time. Also termed as suspended sediment discharge, bedload discharge or total sediment discharge......
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1453
Limiting discharge
Minimum discharge that creates bed movement in a river.
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1454
Dominant formative discharge, Dominant discharge
A discharge which is large enough in magnitude and of sufficient frequency to cast a dominating effect in determining the size and characteristics of the river course, channel and bed......
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1455
Bankful discharge
Discharge corresponding to the state at which the river berms are about to be submerged.
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1480
High water training, or Training for discharge
The provision of efficient cross-sectional area for the expeditious passage of the maximum flood in a river.
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1574
Saturated sediment discharge
When the required materials are available in the bed to generate transportation capacity, the sediment materials that pass over the bed are stated to have reached the saturation level......
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