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
1689
Soil complex
A mapping unit in detailed soil surveys where two or more defined taxonomic units are so intimately intermixed geographically that it is undesirable or impractical, because of the scale being used, to separate them. A more intimate mixing of smaller areas of individual taxonomic units than that described under soil association......
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1737
Colloidal system or Colloidal complex
A complex in which a tremendously large interface is attained by the very fine, heterogeneous dispersion of one (or more) substance in a second substance or material......
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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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2155
Sodium complex
Colloidal matter of typical alkali soils more or less saturated with sodium.
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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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3147
Water-sediment complex
Mixture of water and sediment that traverses regime channels.
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4146
Absorbing well, Drain well, Dead well, or Negative well
1 - A shaft or well driven through an impermeable stratum to allow surface water to drain through to a permeable one. 2 - See 2559 (drain well)......
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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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5905
Moisture-absorbing formwork
Formwork using special materials, which line the concrete surface adjoining the formwork, and are capable of absorbing moisture. The use of such lining has the effect of removing a part of free (excess) water from the external layers of the concrete and, as a result, leads to additional compacting of the concrete......
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7667
Cation exchange capacity
See 1770.
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7670
Base exchange capacity
A measure of the absorptive capacity of a soil for bases or exchangeable ions (OH).
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