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
178
Tests of hypothesis
Tests where `null hypothesis` and corresponding `alternative hypothesis` are enunciated with the intention of verifying whether in the light of sample data the null hypothesis cannot be rejected (See 179)......
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179
Null hypothesis
In general, the term relates to a particular hypothesis under test, as distinct from the alternative hypotheses. The null hypothesis is, generally, a hypothesis of no or null difference and is denoted by H0. The null hypothesis is assumed to be true and is tested against the alternative hypotheses by calculating the sampling distribution of the rel.....
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195
Statistical hypothesis
The hypothesis concerning the parameters or form of the probability distribution for a designated population or populations, or more generally, of a probabilistic mechanism that is supposed to generate the observations......
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356
Electric potential (V)
It is the difference of potential between two points of a conducting wire carrying a constant current of one ampere, when the power dissipated between these points is equal to one watt. Unit of electric potential is volt......
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684
Potamology
The branch of hydrology which pertains to surface streams; the science of rivers.
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890
Evaporativity, Evaporative capacity, Evaporation power, Potential rate of evaporation, or Evaporation potential
Rate of evaporation under existing atmospheric conditions from a free surface of water that is chemically pure and has the temperature of the surrounding atmosphere......
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903
Total evapotranspiration
The sum of water lost from a given land area during any specific time by transpiration from vegetation (agricultural crops or native vegetation), by evaporation from water surfaces, moist soil and snow; and by interception......
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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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1139
Potentiometric surface
The surface that represents the static head of groundwater.
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1241
Evapotranspiration
1   The amount of water removed the soil root zone by evaporation from the soil surface and transpiration from plants.  2   See 4934......
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1242
Potential evapotranspiration
1   The amount of water that could pass into the atmosphere by evapotranspiration if the availability of soil water were not a limiting factor. 2   See 4908......
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1312
Potamology
The study of rivers.
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1785
Potassium-adsorption ratio (PAR)
A ratio for soil extracts and irrigation waters used to express the relative activity of potassium ions in exchange reactions with soil :.....
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1789
Exchangeable acidity or Potential acidity
H+ ions held in reserve
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1825
Capillary potential
The work required to move a unit mass of water against capillary forces, from the free water surface to a specific point in a column of soil......
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1827
Osmotic force, or Osmotic potential
Osmotic pressure of the extracted soil solution.
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1946
Potometer
An instrument for measuring the rate of transpiration of plants.
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2121
Peat-hag, or Peat-Pot
Ground from which peat has been dug or cut.
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2164
Slick spots, Scab spots, or Buffalo wallows
Small areas in a field that are somewhat slick when wet due to alkali or high exchangeable sodium.
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2602
Equipotential lines
1 - A line in an equipotential surface. 2 - See 5098.
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2604
Potential drop
The difference between any two adjacent equipotential lines.
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3047
Potential energy
The energy possessed at a unit of fluid as a result of its position, equal to the mass multiplied by the acceleration of gravity and the height above a field above a field datum. Note : These energies can be shown graphically on a long section of a flow system by erecting the equivalent `heads` to the same vertical scale. Thus the surface line per .....
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3466
Dash pot
A device employed to damp the movement of a mechanism. It consists of a chamber in which the movement of a plate or vane is decelerated by a fluid whose flow from one side of the plate or vane to the other is controlled by a calibrated orifice (illustrated)......
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4082
Distribution pot
A riser pipe which facilitates corrugation irrigation in orchards; the walls of the pot are provided with outlets that are equipped with slide gates that control the flow into the corrugations. The riser may be fitted with a valve to regulate water level, and thus flow rates......
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4209
Equipotential surface
An imaginary surface, within a field of flow in isotropic media, where the total head is the same for all points on the surface and, therefore, the direction of flow is perpendicular to the surface at all points......
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