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
965
River basin management, Watershed management, or River management
Planned use of river basins in accordance with predetermined objectives.
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1113
Groundwater management
Planned use of groundwater in accordance with predetermined objectives.
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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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2200
Watershed management
1 - Comprehensive development of a basin so as to make productive use of some of its natural resources possible, as well as to protect them. 2 - See 6502......
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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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3996
Integrated Water Resources Management
A process that promotes the co-ordinated development and management of water, land and related resources, in order to maximize the resultant economic and social welfare in an equitable manner without compromising the sustainability of vital ecosystems.  .....
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4051
Change of slope (of a canal)
Altering the functioning levels of a canal or canal reach so as to either improve its functioning by gravity or preventing silting or scour......
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4083
Catchment management
Management of catchments to improve the quality of runoff water. Management of the catchment upstream of a risk area to reduce flood generation. Afforestation, for example, is sometimes used to reduce flood generation, and small check ponds are often installed. The measures include those for prevention of erosion, maintenance of ground cover and sa.....
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4084
Leasing management
Organization holding the management functions of a collective project, owned by the public in common or group of irrigators. The leasing contract fixes the modalities of payment for service, specifies the responsibilities of the works controller assigned to the `farmer` : safety of infrastructure and services, recovery of water rates......
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4085
Public service management
Mode of management of an irrigation system on a large scale, when all the management functions are entrusted by the same agency (development corporation)......
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4110
Flood management
The organisation of structural or non-structural measures or responses to flood problems.
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4124
Nonstructural measures of flood management
The measures that alter the exposure of life and property to flooding (floodplain land use planning, flood forecasting and warning, flood-proofing, assistance). They are described as measures that keep people away from floods......
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4125
Structural measures of flood management
The measures that alters the physical characteristics of the floods (reservoir operation, upstream catchment management, channel modifications, levees, operation of hydraulics works). They are often described as measures that keep floods away from people......
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4128
Economic effectiveness of a flood management system
The efficiency of a flood management scheme in generating economic benefits.
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5032
Change in salinity
This change is indicated by the average rate of change in the electric conductivity (EC) of the saturated soil water extract defined by the following ratio : .....
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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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5624
Volume change (of concrete)
The expansion and contraction of hardened concrete resulting from wetting and drying or temperature variations. May produce various types of undesirable conditions in concrete......
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6353
Management account of farm unit
An exact account of farm unit expenses and income. Includes the cost of purchases and cost of services. The income includes the proceeds from direct or indirect sales......
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6358
Efficiency of the resource management
The ratio between the volume of water served upstream of the equipment and that which is actually distributed.
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