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
8371
Impact Printer
A computer-driven mechanical imprinting device where the characters are formed by the printer-head key striking a ribbon to imprint the character’s image onto a paper......
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4780
Impact resistance factor
A parameter for specifying the capacity of an aluminium tube to resist external loads or impacts without permanent deformation......
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2813
Impact stilling basin, or Impact basin
A type of stilling basin to serve the need for relatively smaller basins for the energy dissipation independent of tail water variations or any tail water at all (illustrated)......
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4541
Impeller
A rotating set of vanes in a pump, etc., designed to impel rotation of a mass of fluid.
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7769
Imperfect drainage
Drainage that does not remove water fast enough, such that waterlogging may persist for two or more weeks after rainfall or the ground-water table may rise into the plant root zone long enough to inhibit plant growth during a wet spell.  Occurs in soils that lose gravitational water slowly......
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2257
Impermeable fixed weir, or Solid fixed weir
A fixed weir whose water bearing surfaces are of watertight construction. It may be built with timber, masonry, concrete (plain or reinforced), steel, or combinations thereof......
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7649
Impermeable layer
A layer of soil resistant to penetration by water, air, or roots.
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1132
Impermeable material
Material that does not permit water to move through it at a perceptible rate under the hydraulic gradients normally present......
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1486
Impermeable spur
A spur made up of earth or rockfill, armoured with resistant material like stone, wire boulder crates or cement concrete blocks......
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2256
Impermeable weir
A weir made up of impermeable material, such as rock, stone, brick masonry, concrete, steel, or timber. It can be of a fixed or movable type......
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2542
Impervious blanket
Blanket, when the covering material is impervious.
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8016
Impervious core
A core of an earth dam or levee constructed of puddled or compacted clay or other material, designed to place a water barrier between the upstream and downstream faces......
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5398
Impervious floor
A soil base that does not permit the penetration or passage of water.
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7662
Impervious soil
A soil, often clay, through which water will percolate very slowly, or not at all.  If the former, a better description is ‘slowly-pervious soil’......
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7532
Implementation plan (environmental)
A proposed course of action to achieve (and maintain) some environmental standard.
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1998
Impoldering
Reclamation of a level area which in its original state was subject to high water levels permanently or seasonally, originating from either the surface water or ground water......
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1263
Impoundment
A body of water confined by a dam, dike, floodgate or other barrier.
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8839
Impoundment
Body of water formed by collecting water, as by a dam.
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4395
Impression block
A tool used prior to a fishing tool for the purpose of ascertaining the position and shape of the top of a broken or lost tool in a bore hole......
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5127
Improved drainage or Artificial drainage
Any technique used to improve the natural drainage of the land.
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4440
Improved water wheel, Chakram
A modification of the paddle wheel in which the lower parts of the paddles are placed in a close fitting box to reduce spilling of the water from the edges of the paddle, and making it possible to lift water to comparatively greater heights. The labourers sit on a wooden or bamboo scaffolding erected over the installed wheel, whose paddles they pus.....
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4508
Impulse pump
A type of pump that raises water by periodic application of a force suddenly applied and suddenly discontinued. The hydraulic ram is the most common example of such a type......
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3926
Impulse turbine
A type of turbine in which all the available energy in the fluid is converted into kinetic energy before it acts on the runner of the turbine......
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6286
Impulse, pulse
A unidirectional flow of current of non-repeated wave.
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7154
Impurity
A chemical substance that is unintentionally present with another chemical substance.
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