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
2593
Swedish slip circle method, or Slip circle method
A method used to analyse the stability of an earth dam or rockfill structure wherein the failure is assumed to take place along the cylindrical surface in the form of a rotational slide......
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2594
Slip circle, or Swedish break
An idealized cylindrical surface through an earth or rockfill structure along which a slide failure or slip may take place......
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2596
Critical circle, or Critical surface
The sliding surface assumed in a theoretical analysis of a soil mass for which the factor of safety is minimum.
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3234
Slipform lining
A concrete lining in which the cementing material is either bitumen or Portland cement which has been laid by means of a slipform......
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3235
Slipform
A formwork, generally of moving type, used in construction work to pour or place the material.
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3236
Slipform machine for channel construction
A type of machine that has a steel plate curved up at the leading edge extending across the bottom and up the slopes of a pre-excavated channel, equipped with a hopper which holds the paving material until placed. It is pulled along the channel as it paves.  The paving material issues from the hopper under the force of gravity, to create ditch floo.....
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4338
Spider and slips
Attachments used to suspend the drill pipe in the hole while a joint is being removed or added.
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4380
Slip shoe
A cutting shoe slipped on to the boring tube when starting boring and left in the bottom of the bore when the tube is withdrawn. It is of a larger diameter than the screw shoe for the same diameter of tube. It is useful in stiff clay, rock soil, etc., and for deep bores......
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4399
Full-circle slip socket
A fishing tool with hardened steel slips, and taking a firmer hold on the lost tool than the ordinary friction socket.
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4685
Brush breaker, or Scrub breaker
A large powerful moldboard plough used for ploughing waste land overgrown with brush.
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5362
Siphon breaker
Device to admit air at high point in discharge pipe for stopping siphon operation.
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5363
Sloughing, Slip
Sliding of overlying material; same ultimate effect as caving, but it usually occurs when bank or an underlying stratum is saturated......
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5899
Sliding formwork, or Slip formwork
Forms that envelope the whole contour of the structure under erection and are shifted either continuously, or at frequent intervals, vertically or horizontally along the structure during the whole period of concreting. A special feature of the sliding forms is that dismantling need not be performed as an independent operation, since the forms are r.....
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6016
Gyratory crusher, or Gyratory breaker
A crushing machine that has a conical head has a gyratory (or eccentric) movement inside an outer concave bowl.
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6090
Overbreak
Moving or loosening of rock as the result of a blast, beyond the intended line of cut.
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6438
Slip-off slope bank
The bank of a meandering stream that is not eroded by stream action, and which may be built up gradually.
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6473
Bank slip
The detachment of slices of bank-forming material from the sides of ditches or streams by the process of erosion and the influence of gravity......
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6563
Windbreak, or Shelter belt
A barrier composed of shrubs, trees, erected fencing or other material, designed to break the velocity of the wind near the ground in order to reduce the soil-erosive and carrying power of the air in movement, to cause the deposition of snow in the lee of such barrier, and to prevent evaporation of snow and soil water by wind......
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7972
Dam break analysis
The analysis of the flood flows resulting from postulated conditions of partial or total failure of a water storage dam. Such analyses are particularly important where a significant population would be put at risk by such a failure, and would define conditions for flood warning criteria, as well as for safety factor requirements in dam design or st.....
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8422
Breakpoint
Location of a place in a program where program execution can be stopped to permit a visual test, printing, or other performance analyses......
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8753
Separation, or Break-away
A phenomenon which takes place, when (i) under certain conditions, the boundary layer leaves the surface and curls up into a vortex or whirlpool; (ii) there is abrupt change or discontinuity of a boundary; and (iii) velocities exceed those required for incipient cavitation (illustrated)......
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9069
Work slips form
A specified form that the executing officer may submit to the higher authority at regular intervals, or when considered necessary, reporting cases of probability of exceeding of actual estimated cost of work with necessary explanation so as to enable the higher authority to pass order on the case, on the occurrence, or on the probability of occurre.....
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