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
2341
Flat slab buttress dam, Flat deck dam, Deck dam, Slab and buttress dam, ,Fixed slab buttress dam, Fixed deck dam, Free deck dam, or Cantilever buttress dam
A dam usually of reinforced concrete consisting essentially of slabs supported by transverse buttresses. The load is taken by the slabs and transferred to the foundations through the buttresses. The slab may be (i) integrally cast with the buttresses, (ii) freely supported at the buttresses, or (iii) cantilevered from the buttresses. The dams are a.....
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2342
Truss buttress dam
A type of deck dam where the massive buttresses are replaced by reinforced concrete trusses to support the deck slab.
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2343
Columnar buttress dam
A type of deck dam when the massive buttresses are replaced by a series of inclined columns.
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2344
Multiple arch-buttress dam
A type of buttress dam, consisting of a series of arch barrel segments supported by buttresses. The load is transferred by the several arches to the foundations through the buttresses......
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2345
Deckless buttress dam, Massive head buttress dam
A type of buttress dam when the face slab is replaced by flaring the upstream edges of the buttresses to span the distance between buttress walls. The flaring portion of the buttress (head) may be of various geometrical shapes, viz. (i) massive head, (ii) round head or mushroom head, (iii) diamond head. The buttress dams comprising types of head cl.....
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2346
Multiple dome buttress dam
A modification of a multiple arch dam, with a large dome-shaped structure between the buttresses (illustrated).
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2347
Cupola dam
It is a type of buttress dam having the upstream face in cupola shape.
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2348
Hollow dam
A modification of buttress dam where the buttresses are grouped or joined together, leaving hollow spaces in between such as Dixence dam (Switzerland) (illustrated)......
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2349
Conoidal dam
A dam that can be considered to have been formed by the juxtaposition of a certain number of blocks. The geometrical definition is as follows: The upstream face is a plane, slightly inclined to the vertical, the downstream face is a conoidal surface generated by straight lines, when they touch the horizontal at the crest they are orthogonal thereto.....
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2350
Prestressed dam
A concrete dam placed in compression with high tensile iron bars/weirs placed in holes/shafts in the body of the dam in the upstream portion anchored in the foundation and stretched from the end of the bar/wire at the top of the dam and encasing them with concrete in these holes/shafts. Thus, these post-terminated bars lend a pre-loading compressiv.....
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2351
Arch dam, Arched dam, or Massive arch dam
An arch dam is a solid concrete or masonry dam curved upstream in plan whereby, in addition to the resisting a part of the pressure of the reservoir by its own weight, it is not only able to resist the reservoir pressure due to own weight but also acquire a large measure of stability by virtue of transmission of the part of water pressure or load b.....
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2352
Constant radius arch dam, Constant centre arch dam, or Constant centre dam
An arch dam when the centre of its upstream and downstream faces and the centre line are coincident with the axis centre at all elevations (illustrated)......
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2353
Constant angle arch dam
A type of arch dam wherein all the arch rings have a constant value of central angle (illustrated).
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2354
Variable radius arch dam, or Variable centre dam
A type of an arch dam when neither the radius nor the central angle is constant. This dam is a compromise between the constant radius and the constant angle arch dams (illustrated)......
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2355
Arch dam in series
A series of arch dams placed one after the other in descending heights, the space between successive arches is filled with water to the level of the crest of the lower arch; thus limiting the pressure on each arch in proportion to the difference in height of the two successive arches, consequently the arches would be of constant thickness. This eff.....
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2356
Earth dam, or Embankment dam
A barrier made of earth, clay, sand or sand and gravel, or a combination of these or of the earth and rock.
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2360
Hydraulic fill dams
An earthfill dam in which the fill is excavated, transported and placed in the dam by dredging, sluicing or pumping during construction. The fines are generally segregated and deposited towards the centre of the dam for greater imperviousness......
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2361
Semi-hydraulic fill dam
An earth dam built by transporting the material on to the dam and placed within the section of the dam by means other than water although some of the material is moved into its final position by the action of water......
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2363
Rolled-fill dam, or Rolled-earthfill dam
An earthfill dam which is constructed in successive and mechanically compacted layers.
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2364
Homogeneous earth dam
An earth dam composed of a single type of material except for the protective material on the exposed faces.
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2365
Modified homogeneous earth dam
An earth dam, wherein small amounts of selected pervious materials are carefully placed on an otherwise homogeneous dam to control the action of seepage......
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2366
Composite earth dam, Multiple-zoned earth dam, or Zoned earth dam
A rolled-fill dam consisting essentially of an inner or enclosed impervious section supported by two or more outer sections of a relatively pervious material......
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2371
Rockfill dam
A dam composed of loose rock material usually dumped in place, often with the upstream portion being constructed of hand placed, or derrick placed rock and faced with rolled earth or with an impervious surface of concrete, timber or steel......
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2372
Core-wall type rockfill dam
A rockfill dam that has a core wall of steel, concrete (plain or reinforced) or compacted earth in the centre and loose rockfill is dumped on both sides......
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2373
Composite type rockfill dam, or Earth-and-rockfill dam
A type of rockfill dam consisting of watertight earthfill on the upstream side and rockfill on the downstream side.
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