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
2571
Abridged trial load method, or Simplified trial load method
Used for arch dam preliminary design work by using tables and curves for determining deflections of arches. Modified assumptions are made with regard to the foundation in this analysis which neglect (i) differences in elasticity of rock and concrete, (ii) the angle that the plane of the abutment makes with a vertical plane and (iii) certain seconda.....
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2716
Cradle, or Cradle bridge
1 - A footing structure shaped to fit the conduit it supports for outlet headers with a function similar to that of thrust blocks. In addition to the weight of the pipe and stresses due to hydrostatic pressure and temperature variations, the cradles are subjected to outward thrust due to the reaction of the deflected water column. 2 - See 5081......
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3436
Cross regulator, Check structure, Combined cross regulator, Access bridge with check, Road bridge with regulator, or Check
1 - A structure designed to control the water surface level and flow in a canal, maintaining a specified water depth or head on outlets or turnout structures, particularly when the flow is small. In Australia it is called `Access bridge with check`, or `Road bridge with regulator`. 2 - See 4066......
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3743
Bridge aqueduct
An aqueduct in which the drainage or river water passes through bridge-like spans (formed by a number of piers and their roof by arches or slabs) constructed along the width of the drainage channel or river : the roof of these spans carries on its top a trough or chute from one bank of the drainage or river to the other, through which the irrigatio.....
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3772
Bridge
A structure erected over a depression or an obstacle, as over a river, canal, drainage channel, chasm, roadway, railroad, carrying a roadway or a railway for passengers, animals and vehicular traffic. Bridges may be classified (i) according to type of supporting elements, as slab, beam, girder, truss, arch, cantilever, suspension bridges; (ii) acco.....
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3773
Movable span, Movable bridge
Any span of a bridge that may be turned or raised in any manner to allow passage for vessels through or under the bridge. Also referred to as `movable bridge`......
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3774
Fixed bridge
A bridge that does not move except for expansion and contraction.
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3775
Flumed bridge
A bridge at the site of which waterway of the river or canal is contracted.
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3776
Bridge-cum-fall, Bridge-cum-drop, or Combined bridge and drop
Bridge combined with a canal or drainage fall or drop.
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3777
Bridge-cum-regulator, or Combined bridge and regulator
Bridge combined with a regulator.
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3778
Skew bridge
A bridge in which the abutment faces, posts, and piers are not at right angles to the centre line of the bridge-roadway.
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3780
Arch bridge
A bridge in which the main supporting elements are arches.
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3781
Tubular arch bridge
A bridge in which the main supporting members are arch tubes.
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3782
Slab bridge
A bridge with a reinforced or prestressed concrete slab superstructure resting on T-beams or directly on the substructure......
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3783
I-beam bridge
A small bridge consisting of a floor supported on I-beams.
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3784
Girder bridge
A bridge composed of reinforced concrete girders or steel plate or lattice girders that support the decking.
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3785
Truss bridge
A bridge made up of chords, columns and web members for carrying the floor system.
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3786
Lattice bridge
A bridge having riveted trusses with multiple intersection web systems.
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3787
Pony-truss bridge
A through bridge in which the height of the trusses is less than the height of the loads that go over them.
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3788
Cantilever bridge
A bridge, at least one portion of which projects beyond the supporting pier or piers and acts structurally as a cantilever......
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3789
Suspension bridge
A roadway hung by suspenders from chains, eyebars, or cables that pass over towers of masonry or steel. The chains, eyebars, or cables are anchored at their ends in an anchorage......
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3790
Trestle bridge
A bridge composed of bents or towers carrying the deck. May be either timber or metal.
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3791
Draw bridge
A bridge that may be drawn or turned to one side or lifted up, either wholly or in sections, so as to permit boats to pass under or through it......
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3792
Lift bridge, Vertical lift bridge, Bascule bridge, Swing bridge
A draw bridge the movable parts of which are lifted, whether vertically (vertical lift bridge) or by rotating about a horizontal axis (bascule bridge), or vertical axis (swing bridge)......
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3793
Hinged lift bridge
A lift bridge that has its ends hinged together when down.
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