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
18
Systematic deterministic
A theory that predicts precisely how each observation will turn out, not merely what proportion of observations will in the long run turn out in each of a number of possible ways (See 19)......
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241
Coefficient of determination
The square of the `coefficient of correlation`, the relative measure of the closeness of the association.
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242
Coefficient of multiple determination
The square of the `coefficient of multiple correlation R`, the measure of the closeness of the combined association of multiple variates......
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346
Ampere (A)
The ampere is that constant current that, if maintained in two straight parallel conductors of infinite length, of negligible circular cross section, and placed one metre apart in vacuum, would produce between these conductors a force equal to 2 x 10-7 newton per metre of length......
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532
2000 pounds (av)
img:equations//531_537_e.jpg
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533
2240 pounds (av)
img:equations//531_537_e.jpg
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534
1000 pounds (av)
img:equations//531_537_e.jpg
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935
Deterministic model
1 – A model based on physical laws governing the flow of water and relationship with system properties. 2 – Any model yielding a unique response to a given input......
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984
Intermediate belt
Zone that lies between the belt of soil water and the capillary fringe.
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990
Intermediate water
Water in the intermediate belt.
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1062
Periodic spring, or Intermittent springs
1 - A spring that has periods of relatively large continuous discharge occurring at more or less regular and frequent intervals. Such springs may be classified as perennial or intermittent. While the discharge of such a spring somewhat resembles that of a geyser in its rhythmic action, such discharge is due to an entirely different cause.  2 – Se.....
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1133
Intermediate zone
The portion of the zone of aeration that lies between the soil water zone and the capillary fringe.
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1144
Intermittent saturation zone
The zone between the highest and lowest levels of the groundwater table as it responds to seasonal and short term weather changes......
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1320
Intermittent stream
A natural watercourse that is dry or ceases to flow during some portion of the year.
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1384
Sudd, or Sadd (Arabic : barrier or dam)
Large floating island of vegetative matter impending navigation on the Upper White Nile. Also an earthen embankment blocking a river or branch of a river or ring bund around a work under construction in the bed of a river......
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2075
Indian spring low water
The approximate level of the mean of lower low waters at spring tides, used principally in the Indian Ocean and along the East coast of Asia. Also Indian tide plane......
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2157
Alkalinization (Alkalinisation)
The formation of Na-adsorption compounds through base exchange.
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2284
Method of independent variables, or Khosla`s method of determination of uplift pressures and exit gradients
It is an empirical method evolved by an Indian Engineer A N Khosla for determining uplift pressures with high accuracy for a weir founded on permeable soils. The complex foundation profile is broken up into a number of simple profiles, each of which is independently amenable to mathematical treatment......
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2711
Terminal anchors
Anchors built at the outer ends of the penstocks or the upstream and downstream ends of the penstock and outlet headers.
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3098
Terminal velocity, or Fall velocity
Final velocity of falling particles of a specified sediment grade in still water at a specified temperature.
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3505
Intermittent type sand trap
A sand trap from which settled material is sluiced periodically.
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3715
Adjustable proportional module (APM)
A semi-module orifice outlet with an adjustable roof block designed to distribute small variations in the supply in the parent channel, proportionatey when set at the correct level relative to the depth of the parent channel (illustrated)......
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3749
Irrigation pipe aqueduct, Pipe aqueduct, Pipe flume
An aqueduct in which the canal water is taken in a pipe over the drainage, natural stream, depression or hollows. Also called `pipe flume`......
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3756
Syphon, Inverted siphon, Irrigation syphon, Canal syphon, Syphon superpassage
1 - A structure with a closed conduit, designed to run full and usually under pressure, to transport (i) canal water under railroads, roads, various types of drainage channels and depressions, or (ii) drainage water under railroads, roads, etc. In reference to cross-drainage works on canals, this term pinpoints to the condition that the canal passe.....
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3872
Reverse (angle) head-wall culvert
A culvert in which the ends of the head walls are turned into the embankment (illustrated).
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