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
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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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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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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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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1768
Exchangeable
Describes ions capable of replacement in the exchange (absorbing complex).
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1786
Exchangeable-sodium percentage (ESP)
The degree of saturation of the soil exchange complex with sodium. It may be calculated by the formula :
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1788
Exchange acidity
Acidity produced by treating soil with a solution of a neutral salt.
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1789
Exchangeable acidity or Potential acidity
H+ ions held in reserve
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1790
Hydrolytic acidity
Acidity produced by treating soil with a solution of a salt of a strong base and weak acid.
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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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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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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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4210
Equipotential line
See 2602 and 5098 (illustrated).
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4907
Potential transpiration
The amount of water transpired by a crop which completely covers the ground and which has an adequate supply of water.
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4908
Potential evapotranspiration
1 - The amount of evapotranspiration from a given crop, under given climatic conditions, if soil water is not limiting. 2 - See 1242......
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4933
Potential evaporation
The evaporation from a given surface when all surface-atmospheric interfaces are wet (saturated), so that there is no restriction due to either biological control or soil water content on the water vapour loss from the surface area. Its magnitude will depend primarily on atmospheric conditions and surface albedo, but it also will vary with the geom.....
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5098
Equipotential line
1 - A line in an equipotential surface, (an imaginary surface such that the total head is the same for all points on the surface). 2 - See 2602......
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5100
Exchangeable sodium percentage (ESP)
The degree of saturation of the soil exchange complex with sodium. It may be calculated by the formula:
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5283
Total head, Total hydraulic head or Total soil water potential
Energy contained by fluid by virtue of its pressure, velocity and elevation (total hydraulic head).
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6480
Erosion potential
Amount of erosion that may be expected under given climatic, topographic, soil, crop and cultural conditions.
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6487
Total potential (of soil water)
The amount of work that must be done per unit quantity of pure water in order to transport reversibly and isothermally an infinitesimal quantity of water from a pool of pure water,at a specified elevation and at atmospheric pressure, to the soil water (at the point under consideration). The total potential (of soil water) consists of the following .....
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6640
Biotic potential
The inherent ability of an organism to reproduce and survive within a given time and under stated environmental conditions......
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