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
1526
Bank sluice
An opening controlled by shutters or gates in the marginal embankment which are opened during high floods.
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2063
Tidal outlet, or Tidal sluice
A structure to control the outflow of water.
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2064
Tide gate
An opening, through which water may flow freely in one direction, but which closes automatically and prevents the water from flowing in the other direction......
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2214
Head gate structure
1 - The portion of the head regulator that houses control gates. 2 - Often used in the same sense as a head regulator.
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2231
Gates
A device to stop or release water through a passage. For various types see sub-head V.4 `Gates and valves`.
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2234
Undersluices, Sliding sluices, or Scouring sluices
1 - Gated openings provided in a weir, dam or a barrage having its sill at a level lower than the remaining portion to discharge water as and when required. Undersluices are also known as sliding sluices in main dams where water is discharged at a level much below the reservoir. These can be used to eject detritus material during periods of high fl.....
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2235
Undersluices pocket, Pocket, or Scouring sluices pocket
The portion of river channel upstream of the undersluices bounded by the divide wall, inlet of the head regulator structure and the undersluices (illustrated)......
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2236
Scouring sluice channel, or Undersluice channel
The portion of a river channel leading water to the undersluices and away from it to join the river downstream of the weir or barrage......
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2237
Downstream undersluice channel
A portion of the river or a channel made in the river that confines the erosive effects of the water discharged through the sluice gates that again joins the river downstream......
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2238
Upstream undersluice channel, or Upstream scouring sluice channel
The portion of the river channel leading water to the undersluices and limited up to the sill of the undersluices. `Pocket` is only a part of the upstream undersluice channel......
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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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2272
Segment gate weir
A weir fitted with segment gates on its crest.
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2273
Flap weir, Flash board weir, or Tilting gate weir
A type of movable weir in which a hinged leaf gate rotating about a horizontal axis is installed at the weir crest. Also called `flash board weir`......
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2378
Sluice dam
A dam having sluice openings.
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2474
Gate gallery
Gallery provided in dams for access to and room for the mechanical equipment used for the operation of gates in outlet conduits, power penstocks, or spillway crests......
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2524
Sluice
1 - A conduit for carrying water at high velocity that can if desired be closed by a gate. 2 - An opening in a structure for passing debris. 3 - To cause water to flow at high velocities for wastage, for purposes of excavation, ejecting debris, etc......
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2526
Gate chamber of sluice well
A structure located within the abutment main body of the dam or the dam embankment where the regulating gates or emergency gates are installed. The lower portion of the chamber provides an anchorage for the gates and liner while the upper portion furnishes a working space for the removal of the gate leaf and other parts for repair or for installati.....
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2527
River sluices, Waste outlets, or Dewatering outlets
Sluices provided near the river bed to empty the reservoir or to discharge muddy water during floods and as also to serve as an auxiliary spillway......
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2532
Hoisting chamber
A chamber built at the top of a dam to house remote control hoisting mechanisms.
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2719
Conduit regulator, Surge tank, or Surge chamber
A tank with a free water surface provided at the transition from tunnel or pipeline to penstock to protect the tunnel or pipeline from excessive changes in pressure, particularly the rise in pressure that expeditiously maintains equilibrium in the system by storing or allowing water required for the above purpose. Note - Strictly speaking, `surge t.....
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2723
Surge shaft with expansion chamber
A kind of surge tank that has an expansion chamber provided at the junction of the surge tank and the pipeline to speed up the pressure change at that point......
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2725
Valve chamber, or Valve house
A structure housing the regulating valves, control mechanisms for operation of valves and equipment required to remove parts for repair, etc......
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2742
Fusegates
Free standing barriers of straight or labyrinth types, installed side by side as individual units on a spillway sill, bearing against abutment blocks forming a watertight barrier and used economically for increasing the discharging capacity of the spillway and/or the storage retention in a reservoir.  During exceptional floods they are designed to .....
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2744
Controlled spillway, or Gated spillway
A spillway having any type of control, e.g. crest control or crest gate at the crest to control the reservoir water surface......
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2745
Uncontrolled spillway, or Ungated spillway
A spillway the crest of which permits water to discharge, whenever the reservoir surface is higher than the crest.
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