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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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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1350
Stream load
All rock fragments and dissolved substances from rocks moved along in the stream water.
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1351
Charge, or Load
1 - Sediment carried by a water channel at a given cross section. Expressed as the weight of sediment per unit of time. 2 - See 6036 and 8204......
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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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1382
Wash load
Suspended material of very small size (generally clays and colloids) originating primarily from erosion on the land slopes of the drainage area and or existing in the bed itself to a negligible degree......
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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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1576
Bedload movement law
The classical laws of sediment transportation which help determine the transportation capacity of a river bed, or the sediment discharge at steady level. In other circumstances, the actual sediment discharge differs from the value of saturated sediment discharge. The bedload movement law is to specify that difference......
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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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2569
Trial load method
A three-dimensional method of dam analysis in which the dam is assumed to be made up of two or more systems of elements; for arch dams - vertical cantilever elements and horizontal arch elements; and for gravity dams - vertical cantilever element, horizontal beam elements and a twisted structure system of vertical and horizontal elements. Each syst.....
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2570
Amplified trial load method
For arch dams it is an assumption that the water load is divided between the arch and cantilever elements, that the division may or may not be constant from abutment to abutment for each horizontal element and that the true division of load is the one which causes equal arch and cantilever deflections in all arches and cantilevers instead of at the.....
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2571
Abridged trial load method, or Simplified trial load method
Used for arch dam preliminary design work by using tables and curves for determining deflections of arches. Modified assumptions are made with regard to the foundation in this analysis which neglect (i) differences in elasticity of rock and concrete, (ii) the angle that the plane of the abutment makes with a vertical plane and (iii) certain seconda.....
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2572
Trial load twist method (for gravity dams)
It is based on the assumption that the water load is divided between a structural system made up of vertical and horizontal elements with each system occupying the entire volume of the dam. For ungrouted joints there are two systems, the cantilever structure and the twisted structure. The grouted joints have three systems, the cantilever structure,.....
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