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
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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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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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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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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2632
Silt pressure, or Silt load
Pressure exerted by saturated silt deposited against upstream side of a water retaining structure. The horizontal component (Vs) of silt load is given by Rankine`s formula by neglecting friction .....
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3112
Bed load
1 - Sand, silt, gravel, or soil and rock detritus carried by a stream on or immediately above its bed. The particles of this material have a density or grain size such as to preclude movement far above or for a long distance out of contact with the stream bed under natural conditions of flow. 2 - The quantity of silt, sand, gravel, or other detritu.....
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3114
Bed material load
That part of the sediment load which consists of grain sizes represented in the bed.
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3115
Bed load function
The rates at which various discharges will transport the different grain sizes of the bed material in a given channel.
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3116
Bed load equation
The general relationship between bed load rate, flow condition, and composition of the bed material.
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3117
General movement of bed load
The stage of movement when all sediment sizes of the bed material are in motion and the movement is strong enough to develop bed configuration......
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3118
Contact load
The material rolling or sliding along the bed in substantially continuous contact with the bed.
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3119
Saltation
Discontinuous motion of particles above the bed of a channel in series of short hops. Also refers to the same type of movement of soil particles over a land surface during wind erosion......
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3120
Saltation layer
The zone above the bed where the phenomenon of saltation occurs in flowing channel.
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3121
Saltation load
The material bouncing along the bed, or moved, directly or indirectly, by the impact of the bouncing particles.
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3122
Saltation load discharge
The amount of material moved in unit time due to saltation.
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3123
Suspended load
Particles moving outside the bed layer. The suspended particles are continuously supported by the turbulence of the fluid......
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3141
Specific bed load transport
The mass of the transported quantity of bed load per unit width of bed per unit of time, weighed dry or under water.
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4023
Overload of a canal
Discharge in excess of the designed discharge.
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5266
Overloading
A condition created in drain pipes when the water reaching them exceeds their capacity.
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6097
Chinaman, or Elevated loading ramp
An elevated loading ramp, over which material is dozed or pushed; with openings to allow the material to fall through into the carrying unit......
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6138
Payloader
Basically a tractor that has a hydraulic front end lift; may be mounted on wheels or on crawlers.
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