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
115
Analysis of variance
A separation into components associated with defined sources of variation, of the total variation displayed by a set of observations, as measured by the sums of squares of deviations from the mean......
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232
Correlation analysis
The statistical methods to test the closeness with which two (or more) phenomena co-vary.
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934
Physical model
Model based on conservation of laws of mass, energy, and momentum  and on the similarity between water flow in a prototype and flow in a reduced-scale model of the prototype.......
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964
Risk analysis
Qualification of the various sources of uncertainty in risk prediction and comparison of relative risk.
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1117
Physical yield limit, or Potential yield
The greatest rate of artificial withdrawal from an aquifer that can be maintained throughout the foreseeable future without regard to cost. Equal therefore to the present recharge, or that anticipated in the foreseeable future, less the unrecoverable natural discharge......
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1650
Mechanical analysis, or Physical analysis
The process of separating a soil by mechanical means into various sized particle groups according to an effective diameter......
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1651
Sedimentation analysis
Separation of particles depending on the rate of settling in a fluid.
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2566
Gravity method (two-dimensional method of analysis)
A method for stress analysis of gravity dams assuming the structure of the dam to be composed of vertical cantilever elements that act independently of each other while the vertical stress varies linearly......
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2577
Cracked cantilever analysis
In thin arch dams the applied radial loads tend to produce tension in the cantilevers. Since ordinary concrete is usually not assumed to have a tensile strength more than a specified value (say, 20 kg/cm2) and when this specified value of stress is exceeded all the cantilevers in tension may be assumed to be cracked to the point of zero stress so t.....
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2791
Mechanically induced water seal
Water seal formed by mechanical means such as (i) by installing an air pump to suck out air from the siphon (ii) by installing a flexible steel plate at the crest and projecting into the siphon duct (illustrated)......
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3068
Eddy viscosity, Mechanical velocity, Exchange coefficient, or Eddy conductivity
Analogous to the dynamic viscosity, but depends upon the Reynolds number and other parameters. Referred to by various writers as the `mechanical velocity`, `exchange coefficient` and `eddy conductivity`......
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3898
Stationary mechanical screen, or Bar screen
1 - A fish screen consisting often of grillages of small steel bars running from the bottom of the channel to the platform above the water surface. 2 - See 7376......
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3904
Mechanical sweeps
Devices for transferring fish from a holding pool to a brail pool (illustrated).
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4121
Vulnerability analysis
A method for determining the degree to which land uses/activities are prone to flooding disruption.
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5325
Mechanical weed control
Weed control with the use of mechanical equipment and machinery for control cutting- or pulling out weeds and their roots......
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5667
Mechanical properties
The properties are, that affect strength and durability of concrete, such as aggregate crushing value, extent of particles of fine aggregates, impact value of aggregates, abrasion value, polished stone value, crushing strength, soundness, thermal and petrographic properties......
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7493
Environmental analysis
The means to determine whether an action under consideration will have a significant effect on the environment. Evaluation of the short- and long‑term, primary and secondary environmental effects of an action......
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7505
Environmental impact analysis
A more‑or‑less formal consideration of the interaction of a proposed human activity with environmental elements that might be affected by the activity. Includes a determination of the probable effect of the activity on social and economic conditions.  Assessment of impact generally involves two major elements ‑ a quantitative measure of magni.....
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7860
Hazard analysis
Identification, studies and monitoring of any hazard to determine its potential, origin, characteristics and behaviour.
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7881
Risk assessment/analysis
A methodology to determine the nature and extent of risk by analysing potential hazards and evaluating existing conditions of vulnerability that could pose a potential threat or harm to people, property, livelihoods and the environment on which they depend. .....
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7926
Flood frequency analysis
The estimation of the frequency of occurrence of floods at a site. Flood frequency analysis generally consists of attempting to fit a probability distribution to flood discharge data and generalise the results for use at sites with no flood data. Many techniques have been proposed and are in use......
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7972
Dam break analysis
The analysis of the flood flows resulting from postulated conditions of partial or total failure of a water storage dam. Such analyses are particularly important where a significant population would be put at risk by such a failure, and would define conditions for flood warning criteria, as well as for safety factor requirements in dam design or st.....
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8538
Iconic models, or Physical models
A physical replica of the real system on a reduced scale.
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8569
Systems analysis, Operational analysis, System engineering, Mathematical modeling, Management science
A specialized application of methods and concepts of mathematics, logic, engineering and other social, economic, and physical sciences to determine what must be accomplished and the best method of accomplishing it......
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8589
Black box analysis
Analysis in which the relationship between input and output functions is derived while judging the internal mechanism of the system as irrelevant and is assumed to be lumped or macroscopic......
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