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
img:equations//439_441_e.jpg
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552
Discharge and yield
img:equations//550-552_e.jpg
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955
Bankfull, or Bankfull stage
The stage attained by a stream when flowing at a capacity above which the natural banks overflow.
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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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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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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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1580
State of sediment discharge motion
State of a bed in which the erosive forces generated by the flow are equal to forces that withstand the erosion, deriving from the substratum. This state is characterized by a balance between the shear stress on the wall and the critical stress......
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2611
Discharge velocity
Rate of discharge of water through a porous medium per unit of total area perpendicular to the direction of flow.
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2766
Discharge carrier, or Face of the spillway
It is that portion of a spillway that extends from the control structure to the energy dissipator or to the downstream end of the spillway......
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2869
Tailwater rating curve, or Downstream stage discharge curve
A curve showing relationship between the discharge and the corresponding tailwater stage.
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2985
Free discharge tube valves
Tube valves used at the downstream ends of conduits are shorter and have nozzles at 45o. The issuing jet is unstable at lower discharges......
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3050
Continuity of discharge, or Continuity of flow
Existence of steady rate of flow throughout a reach of a channel.
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3122
Saltation load discharge
The amount of material moved in unit time due to saltation.
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3125
Sediment discharge
Mass of sediment transported per unit time over the whole cross section.
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