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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733
Regeneration flow, or Return flow
Water, that has been diverted from a body of surface water for irrigation purposes, passing downwards through the soil to groundwater, and ultimately reaching the same or another body of surface water to the subsoil water table......
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854
Interflow, Subsurface runoff
That portion of the precipitation which has not passed down the water table but is discharged from the area as subsurface flow into stream channels. Also known as ‘subsurface runoff’ (illustrated)......
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855
Subsurface flow, or Underground flow
The phenomenon of water flowing beneath the earth`s surface.
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917
Base flow, Basic flow, or Permanent flow
1 - The sustained or dry weather flow of streams resulting from the outflow of permanent or perched groundwater, and from the drainage of large lakes and swamps. Also water from glaciers, snow and all other possible sources not resulting from direct runoff. 2 – The discharge of a surface channel when the soil in its catchment area is in a conditi.....
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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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1960
Daily range of soil temperature
The difference between the maximum and minimum values of soil temperature.
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2084
Tide, daily retardation of
The amount of time by which the corresponding tides grow later day by day (about 50 minutes).
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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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2617
Plastic flow, or Plastic deformation
The deformation of a plastic material beyond the point of recovery accompanied by continuing deformation with no further increase in stress......
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