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
115
Analysis of variance
A separation into components associated with defined sources of variation, of the total variation displayed by a set of observations, as measured by the sums of squares of deviations from the mean......
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232
Correlation analysis
The statistical methods to test the closeness with which two (or more) phenomena co-vary.
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964
Risk analysis
Qualification of the various sources of uncertainty in risk prediction and comparison of relative risk.
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1055
Fault dam spring
Groundwater discharge to the earth`s surface above a reverse fault, the depressed bedrock block being covered with a thick deposit of alluvium and the raised block presenting a barrier to the flow of groundwater......
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1077
Groundwater dam
A natural or artificial body of material that is impermeable or has only low permeability and which occurs below the surface in such a position that it impedes the horizontal movement of groundwater and consequently causes a pronounced difference in the level of the water table on its opposite sides......
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1264
Retention dams
Small earthen dams designed to retain water for only short periods of time to prevent excessively rapid runoff and erosion......
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1284
Quondam
An outlet that is no longer functioning. .
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1354
Detention dam
A dam built to store streamflow or surface runoff and to control the release of such stored water.
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1355
Diversion dam
A barrier built across a stream to divert all or some of the water.
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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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1561
Basket dam
A sack dam composed of boulders held in a woven wire sack and piled up to form a barrier or jetty.
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1562
Sausage dam
A type of deflection or diversion dam composed of layers of boulders, overlaid and held in place by hogwire fencing; distinguished from a basket dam in that the latter is a woven wire sack filled with boulders and piled up as in a sack dam. Both are especially adapted to jetties and river bank protection......
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1563
Crib, Crib dam, Pigsty work, Pigstying
A type of construction consisting of pieces of timber fixed together to form bays or cells which are filled with stone or other suitable material. May be of various shapes. Used for dams, groynes, bank protection, etc.; sometimes called `pigsty work` or `pigstying`, though the latter is also used for timber work similar to cribwork but without the .....
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1650
Mechanical analysis, or Physical analysis
The process of separating a soil by mechanical means into various sized particle groups according to an effective diameter......
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1651
Sedimentation analysis
Separation of particles depending on the rate of settling in a fluid.
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1999
Sill dam
A dam, generally of strong brushwood mattress weighted with heavy rip-rap, constructed on the sea side in the foreground, for the purpose of guarding against scouring of the sea bottom by the overflowing water and consequent damage to the structures and other works......
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2248
Closed weir, Overflow diversion dam, Fixed crest weir, Blind weir, or Ungated weir
A low dam built as a complete obstruction across the river so that the entire stream flow can pass over it. It may or may not be fitted with crest gates; when not fitted with crest gates, it is also called `fixed crest weir`, or `blind weir`, or `ungated weir`......
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2249
Open weir, or Open diversion dam
A diversion weir across a river to produce least obstruction to the flow. It comprises undersluices and several other bays having falling shutters fitted on a permanent structure......
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2255
Fixed buttress weir, Ambursen dam or Ambursen weir
A fixed dam consisting of water-supporting upstream face supported by buttresses which are equally spaced walls or struts proportioned to transmit the water load and the weight of the structure, to the foundations. Note - It is classified as open or closed Ambursen weir according to the absence or provision of downstream face slab.(originated by Sw.....
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2327
Dam
A barrier usually on an important scale across a watercourse, for the purpose of impounding water or creating a reservoir (i) to raise water level, (ii) to divert water therefrom into a conduit or channel, (iii) to create a hydraulic head that can be used to generate power, (iv) to improve river navigability by means of regulated releases of stored.....
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2328
Check dam
Small dam constructed in a gully or other small watercourse to decrease the streamflow velocity, minimize channel scour and promote deposition of sediment......
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2330
Masonry dam
A dam composed of one or more of the following materials : bricks or stone masonry or concrete (plain, reinforced, prestressed)......
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2331
Masonry-cum-earth dam
A dam comprising a portion made of earth and a part in masonry along its length (length of spillway portion being excluded)......
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2332
Framed dam
A barrier generally built of timber or steel framed to form a water face supported by struts.
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2333
Timber dam
A framed dam where the material used is timber.
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