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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862
Channel storage, or Temporary storage or Wedge storage
1 – The additional volume of water contained in a channel reach as a result of inflow to the reach being greater than the channel can discharge immediately (Illustrated). 2 – See 5372......
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1477
River training, or Channel regulation
1. Engineering structures (including artificial plantations) with or without the construction of embankment, built along a river or a section thereof, to direct or lead the flow into a prescribed channel. 2. The modification of a river, by man, to allow or enhance navigation by developing a waterway of required depth either by construction of a ser.....
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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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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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2890
Stop log, Baulk, Plank, Regulation plank or `Kurry`
Log, plank, cut timber, steel or concrete slab or beam fitting into the grooves made on the faces of two opposite walls or piers to close an opening for passage of water. In case where regulation is effected by such device, it is called `regulation plank` (log, kurry, baulk)......
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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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3400
Broken-back transition, Dog leg transition, or Wedge transition
A transition having a broken back (illustrated).
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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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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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4018
Still pond regulation
Method of regulation of the headworks when the under-sluices in the pocket are closed, and the canal is fed from a still volume of water......
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4019
Open flow regulation, or Continuous scour regulation
Method of regulation of headworks with the under-sluices of the pocket being open, the canal is fed from a still volume of water through which running water flows......
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4020
Semi-still pond regulation, or Semi-open flow regulation
Method of regulation of headworks when the gates are raised up to the level of the tunnel so that the sediment is discharged through the under-sluices and the canal is fed with the relatively clear water from the upper layers of the pocket......
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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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4022
Double wedge regulation
Method of regulation of headworks of canals, long closures are not permissible and where the discharge is such that the ratio of velocities in the river and the pocket is unfavorable : openings of the gates close to the divide wall are larger than those further away. If the barrage feeds canals from both the banks, the openings are  minimum at the .....
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4025
Sluggish system
A system with an unduly long time of response due to oscillatory phenomena.
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4029
Self-regulation
Systems of regulation by an identified group of farmers / cultivators, involving practically no outside intervention for operating the system......
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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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