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
2459
Foundation
1 - That part of a structure that exclusively serves to transmit the weight of the structure on to the natural ground. In dams it is understood to mean both the valley floor and the dam abutments. 2 - See 5939......
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2471
Gallery
An opening or passage provided within the body of a structure that may run either transversely or longitudinally and may be either horizontal or on a slope......
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2472
Foundation gallery
A gallery provided in the dam body for access to the foundations for inspection and/or drainage for percolated water from the upstream face or seepage through the dam. Generally it is provided along the length of the dam near the rock-surfaces and conforming to the elevations in the transverse profile of the canyon, located near the axis of the dam.....
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2473
Drainage gallery
A supplementary gallery located further downstream of the foundation gallery for the purpose of drilling and draining the downstream portion of the dam......
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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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2476
Inspection gallery
Gallery provided in a dam, for access to the interior of the body-mass to inspect the structure and study the structural behaviour of the dam after completion. Foundation, drainage, gate and grouting galleries also serve as inspection galleries......
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2480
Foundation tunnels
Tunnels provided in the rock portion below the base of a dam or in the abutments at a higher elevation, for grouting and access to foundation grouting operations, or for any future treatment in the event of unsatisfactory subsurface conditions after completion of the structure and filling of the reservoir. In addition, the foundation tunnels are al.....
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2509
Foundation joint
The joint along the plane of contact between the superstructure and the foundation.
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3852
Well foundations, Hollow box foundations
Foundations under the piers, and abutments of hollow cylinders/boxes of masonry or concrete, placed on well/box curbs and sunk to the required depth. The hollow cylinders or boxes are plugged at the bottom and top by concrete and the hollow space is either filled with sand, gravel or concrete, or left empty. The hollow box type foundations are, som.....
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3853
Raft foundation
A layer of concrete, usually reinforced, extending under the whole area of columns, piers and abutments and projecting outside their base periphery; used to provide a foundation in case where the ground is unduly soft or the loading to be put upon it is unduly heavy......
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3854
Solid pier foundations
Foundations of a pier formed by constructing the solid pier right from the hard rock foundation stratum.
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4151
Infiltration tunnel, Infiltration gallery, or Kanat
Low gradient closed conduit (drain or tunnel) dug into an aquifer to collect groundwater by gravity flow.
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5939
Foundations, or Starting lifts
Special footing forms used when initial lifts of a mass concrete structure must be founded on rock or in a rock cut, such that prevent the use of cantilever forms is prevented. May need to that must be tied down to pins or anchors drilled and grouted with the rock surface......
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