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
8192
L2 cache, Secondary cache
A larger, slower cache between the primary cache and main memory. Whereas the primary cache is often on the same integrated circuit as the central processing unit (CPU), a secondary cache is usually external......
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9328
La Niña
See El Niño-Southern Oscillation (ENSO) (9304).
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8193
Label
1 - A set of symbols used to identify or describe an item, record message, or file. Occasionally it may be the same as the address in storage. 2 - To assign a symbol, acronym, or word, as a means of identification, to a body of data, tape, card, deck, blocks; to create a specialized associated record or filing `handle`......
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7293
Labelling
Adding a tracer to water or sediment to follow its movement.
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9050
Labour records
Records relating to all labour employed on the site, the trades and classifications, number of labour, periods of engagement, idle time and the comparison between labour required and available throughout the contract period......
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3082
Lacey`s equation
An empirical equation for alluvial channel. Equation propounded by Lacey for design of channels designs that relates regime velocity, slope and sediment characteristics as :
        1  
V = --- . R3/4 S1/2
        Na
wherein the absolute roughness coefficient Na = 0.0225f1/4 in which Lacey’s silt factor    f = 1.76d1/2, d being mean diameter of.....
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3146
Lacey`s silt factor (f )
A factor introduced by Lacey in 1930 based on the theory that in all regime channels of the same silt grade the ratio V2/R in which V denotes the mean velocity and R the hydraulic mean depth, characterizes turbulence and is constant. When the silt factor is unity, as given by the equation 57.0 = fV2/R, the grade of sand closely approximates to that.....
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2288
Lacey`s waterway, or Lacey`s wetted perimeter
The wetted perimeter determined by Lacey`s formula P = 1.47 Q 1/2 where P = perimeter in metres, and Q = discharge in cubic metres per second (cumec). In case, where the width of the channel is considerably larger in comparison to the depth of water, the computed perimeter is provided as width......
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1259
Lacology
The study of lakes and ponds.
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5778
Lacquer
A solution of film-forming substances in volatile solvent.
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5756
Lacquer paint
Lacquer varnish, usually coloured and often opaque.
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1265
Lacustrine
Pertaining to the lake environment.
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2096
Lacustrine, Fen soil, or Lowmoor
Peaty land, concave in shape, formed in low-lying positions under anaerobic conditions and containing much sedimentary material......
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276
Lag
An event occurring in time t +k (k greater than zero) is said to lag behind an event occurring at time t , the extent of the `lag` being k . An event occurring k time-units before another may be regarded as bearing a negative lag, or a `lead`......
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838
Lag (time)
1 : The time elapsing between the occurrence of corresponding changes in discharge or water level at two points in a river. 2 - The time between the beginning of rainfall to the beginning of runoff. 3 - The time between the beginning of snow melt and the start of the resulting runoff. 4 - Time of travel......
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277
Lag correlation
The correlation between two series when one of the series has a lag with reference to the other.
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1342
Lag deposits
Deposits in stream channels of larger and heavier particles which get sorted out and left behind while the smaller and lighter particles are moved rapidly downstream......
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4276
Lagging
1 - Planks or other materials used for the outer cylinder or drum in a drum-curb. 2 - See 6129.
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6129
Lagging
1 - The surface or contact area of a drum or flat pulley especially a detachable surface or one of special composition. 2 - See 4276......
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1270
Lagoon
A shallow area of water generally separated from a larger body of water by a partial barrier.
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7434
Lagoon
An oxidation pond in which wastewater is purified through sedimentation, and both aerobic and anaerobic biochemical action......
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4445
Lagor
A local term used in India for one of the two systems of working the rope-and-bucket lift. In this system the cattle have to return back on the same ramp......
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1271
Laguna
Spanish for `lake`.
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5626
Laitance
A watery scum which may form at the top of concrete when too much water has been used, or when too much floating or trowelling has been done. If laitance is not removed, the upper portion of the concrete will be porous......
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686
Lake
1 - An inland body of water, small to moderately large, with its surface water exposed to the atmosphere. 2 - A large body of water contained in a depression of the earth`s surface and supplied from drainage of a larger area......
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