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
948
N-Year flood
A flood which has a probability of being equalled or exceeded once every N-years or has one chance in N of occurring in any one year......
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7954
N-Year flood
A flood that has a probability of being equalled or exceeded once in every N-years or has one chance in N of occuring in any one year......
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6310
Nadir
In remote sensing, point on the ground vertically beneath the perspective centre of the camera lens.
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397
Nano
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6853
Nanoplankton
Floating, microscopic plant and animal life.
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9337
Nanoplankton
Phytoplankton whose lengths range from 10-50 µm.
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2299
Nappe
A sheet or curtain of water overflowing a weir, fall, etc. The nappe has an upper and a lower surface profile.
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6524
Narrow-base terrace
A terrace similar to a broad-base terrace in all respects excepting the width of ridge and channel.
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2309
Narrow-crested inclined weir
A weir formed by projecting an inclined wall (upstream or downstream) from the bed of the channel. Briefly, these are called `inclined weirs` (illustrated)......
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7003
Natality
The birth of offspring by a given animal population.
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6613
Native
An animal or plant that is indigenous to a given locale.
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5583
Natural aggregates
Naturally occurring aggregates that do not require crushing; washing and/or screening for grading may be necessary before use......
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5485
Natural bed (stone)
The surface of a stone whereon it was originally deposited, but not necessarily horizontal when resting in the quarry, the strata being often inclined and even upright, due to the beds having become folded by volcanic and other agencies......
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2544
Natural blanket
A cover of naturally occurring soil acting as a blanket. The natural blanket is generally less permeable.
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5517
Natural cement
The finely pulverized product resulting from the calcination of an argillaceous limestone at a temperature just sufficient to drive off the carbonic acid gas. Does not slake with water into a hydraulic cement unless ground......
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7866
Natural disaster
A serious disruption triggered by a natural hazard causing human, material, economic or environmental losses, which exceed the ability of those affected to cope......
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7793
Natural drainage layout
A drainage system layout that follows natural depressions in the topography.
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5126
Natural drainage or Natural drainage capacity
The capacity of land to naturally remove excess water.
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5050
Natural drainage system
System of field drainage, passing through and connecting depressions.
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5173
Natural drainage systems, or Random drainage systems
Drains that follow the natural depression in the land, and converge like the frame of a tree (illustrated).
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6575
Natural ecosystem
Ecosystem that attains its development without appreciable interference by man and is subject to natural forces of modification and destruction. .....
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6599
Natural environment
1 - The atmospheric, geological and biological complex found in an area in the absence of artifacts or influences of a well-developed technological, human culture. 2 - An environment in which human impact is not controlling, or not significantly greater than that of other animals. .....
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6464
Natural erosion
Wearing away of earth`s surface by water, ice or other natural agents under natural environmental conditions, undisturbed by man. Synonymous with `geological erosion`......
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7675
Natural fertility
The nutrient status of soil that allows it to support plant growth,  existing before any modification by humans.
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4119
Natural floodplain
Floodplain undisturbed by human interference.
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