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
363
Volume
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367
Specific volume
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405
Volume
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415
Volume
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545
Volume
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1028
Intake area (of an aquifer)
The area of earth`s surface where the water, from precipitation or surface flow, that eventually reaches the zone of saturation of an aquifer, is absorbed......
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1029
Catchment area, or Basin (of an aquifer)
The surface area composed of the intake area of an aquifer and all other areas that contribute surface water to the intake......
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1099
Effective velocity (of groundwater), Actual velocity (of groundwater), True velocity (of groundwater), or Field velocity (of groundwater)
The velocity measured by the volume of groundwater passing per unit time through unit cross sectional area divided by the effective porosity of the water transmitting material......
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1100
Apparent velocity (of groundwater)
The apparent distance moved in unit time by groundwater. It is determined by V = Q/F where F is the cross sectional area perpendicular to the streamlines and Q the volume of water passing through this cross section in unit time......
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1101
Average velocity (of groundwater)
The volume of groundwater passing through a unit cross-sectional area in unit time divided by the porosity of the water transmitting material......
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1102
Critical velocity (of groundwater )
For porous media the maximum velocity under which laminar flow can occur.
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1709
Apparent specific gravity, Volume weight or Bulk specific gravity
The ratio of the mass of a unit or given volume of oven-dry soil, air space included, to the mass of an equal volume of water......
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1766
Exchange complex, or Absorbing complex
The surface-active constituents of soil (both inorganic and organic) that are capable of cation exchange.
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1768
Exchangeable
Describes ions capable of replacement in the exchange (absorbing complex).
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1769
Ion exchange, Cation exchange, or Anion exchange
The replacement in a colloidal system of an ion by another with a charge of the same sign. Cation exchange refers to the interchange of positively charged ions (cations) and anion exchange to the replacement of negatively charged ions (anions) by other anions......
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1770
Exchange capacity, Cation exchange capacity, Base exchange capacity, or Saturation capacity
The total cation exchange, usually expressed as milliequivalents per 100 grams. Measured value of cation exchange capacity depends somewhat on the method used for the determination......
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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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1824
Moisture characteristics (of soils)
Refers to the relation between the soil moisture content and the soil moisture tension. This may be expressed in terms of the soil moisture characteristic curve......
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1973
Productivity (of soil)
The capacity of a soil for producing a specified plant or sequence of plants under a specified system of management.
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2441
Volume (dam)
Space occupied by all materials in the dam. The volume of a dam includes the main fill, the riprap and the impervious blanket......
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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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4013
Average supply (of a canal)
Quotient of the sum of the measured daily discharges at the head of a canal by the number of days of measurement.
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4037
Total demand (in discharge and in volume)
Sum of the discharges (or volumes) requested by irrigators downstream of any point in a canal system, at the head of a transport or delivery canal or at the head of an individual field......
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