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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30
Systematic error
1 - An error which, for known changes in field conditions, undergoes proportional changes in magnitude and which, for unchanging conditions, remains unchanged, both in sign and magnitude. Because in given conditions, the sign of a systematic error remains the same, the separate errors in a series of measurements will be cumulative in their total ef.....
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336
Metric system
A decimal system of units based upon the metre as the unit of length, the gram as the unit of weight or mass, and the second as the unit of time......
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337
Foot-Pound-Second (FPS) system, or British system
A system of units having the foot as the unit of length, the pound as the unit of weight or mass, and the second as the unit of time......
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338
Centimetre-Gram-Second (CGS) system
A system of units based upon the centimetre as the unit of length, the gram as the unit of weight or mass and the second as the unit of time. In practice this system was enlarged by adding the kelvin, the candela and the mole as base units for the base quantities, temperature, luminous intensity and amount of substance respectively......
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339
Metre-Kilogram-Second (MKS) system
A system of units having the metre as a unit of length, the kilogram as the unit of weight or mass and the second as the unit of time......
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1507
Stem bank, or Shank
Embankment connecting a groyne head to the river bank or marginal bund (illustrated).
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1527
Guide bank, or Bell`s bund
A protective or training embankment constructed at the side of a weir, bridge, etc., to guide the river into the waterway in the structure; named after Mr. J.R. Bell who designed such bunds (illustrated)......
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1737
Colloidal system or Colloidal complex
A complex in which a tremendously large interface is attained by the very fine, heterogeneous dispersion of one (or more) substance in a second substance or material......
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1910
Meristem
Embryonic or undifferentiated cellular tissue capable of active cell division.
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2660
Soil classification systems
System of classification of soils based on recognition of the type and predominance of the constituents of soil considering grain size, gradation, plasticity and compressibility. Amongst the widely used soil classification systems are Unified Soil Classification System, USDA system and AASHO system of USA. Other countries also have their systems......
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2905
Whiting`s counterbalancing system
The counterweight is housed in a chamber that has a large inlet pipe with its mouth just below the full reservoir level and a small exit pipe kept constantly open. The outflow is less than the inflow and hence buoyancy is exerted over the counterweight which helps in its automatic operation......
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3487
Floating guide bank system, or Stream directing system
A sediment or silt exclusion device placed in the river in front of the entrance of a canal, comprising separate sections, in one arrangement, hinged together each with four partially submerged gates connected at their top by an overhead truss at an inclination to the river current. The gates divert the surface water towards the canal and the botto.....
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3576
Overpour bank, or Overflow bank
The spilling part of a canal overflow spillway having the profile of an Ambursen weir to fit the bank slopes.
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3735
Distribution system
Network of canal or pipelines that services the users from a main canal or pipeline.
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3815
Flooring system
The floor beams, stringers or other members that comprise the direct load carrying portion of a bridge.
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4009
Channel efficiency, or System efficiency
The ratio of the water delivered to the water placed in a canal or other conveyance structures.
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4021
Wedge system of regulation
Method of regulation of headworks when, on a rising river, the gate openings are increased from the flanks towards the center, and, on a falling river, the gate openings are decreased from the center to the flanks......
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4025
Sluggish system
A system with an unduly long time of response due to oscillatory phenomena.
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4031
Block system (a term used in India in the States of Maharashtra and Gujarat)
A system which consists of limiting water delivery to blocks (i.e. fixed areas) for a definite period (generally six years) where only certain crops are permitted. There are different kinds of blocks in a given irrigation farm holding : sugar cane blocks, garden blocks, `kharif` blocks and `rabi` blocks. In sugar cane blocks, any crop may be grown .....
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4032
Night-storage irrigation system
In this system practiced in Sudan, crops are not watered by night. The outlet pipes are closed at sunset but water continues to enter the tertiary canal, flow rate being the same as the one recorded during the day. At the downstream reaches of the tertiary canal, a small flat crested brick weir is constructed. A steel pipe is also provided across t.....
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4034
Intermittent-flow irrigation system
A system, in which each irrigator gets water only intermittently either by pre-established rotation of the basic flow (called module) or on demand i.e. according to the prior demands by individuals or group of individuals of the quantities and at the times that appear to them most desirable, or finally, in the most modern pressurized systems, in to.....
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4035
Rotation, Rotation System, or Rotational working
A method of managing an irrigation supply system such that an irrigator, or small group of irrigators, receive water delivery for a fixed period of time, after which the water is moved to the next turnout(s). Deliveries are  rotated at all irrigators so that the supply again becomes available before crop stresses can occur. The period of time requi.....
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4061
Follow-on system
A procedure of distribution between co-irrigators where the turn of each co-irrigator is decided / calculated on the basis of hours of use of discharge. When one co-irrigator has finished, he hands it over to the next one on the roster and so on. This order is observed even if there is rotational running of canals or outlets......
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4093
Non-automatic system
A system where monitoring of water levels and flow rates, and control of regulating structures, is accomplished by real-time human intervention......
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