International Commission on Irrigation & Drainage Commission Interationale des Irrigation et du Drainage

Multilingual Technical Dictionary (MTD)
<<    Browsing page 1 of 2    >>
Term No.Term Name/Term DescriptionAction
1237
Submerged weir, or Drowned weir
A weir  for which the water level on the downstream side at an elevation equal to, or higher than, the weir crest; the rate of discharge is affected by the tail water......
Similar Terms
1299
Tidal flats
Areas of nearly flat, barren mud periodically covered by tidal waters.
Similar Terms
1487
Submerged spur
A spur having its top level below the high flood level.
Similar Terms
1488
Nonsubmerged spur
A spur having its top above the high flood level. Normally a free board of 1.5 m to 2.0 m is provided between the high flood level and top level of the nonsubmerged spur......
Similar Terms
2145
Alkali flat
A sterile plain containing an excess of alkali, typically at the bottom of an underdrained basin in an arid region.
Similar Terms
2274
Inflatable weir
A weir constructed of neoprene reinforced with nylon and anchored to a concrete foundation. The weir inflates by water pressure and automatically deflates when the upstream water reaches a prescribed level......
Similar Terms
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.....
Similar Terms
2665
Submerged unit weight, or Buoyant unit weight
The weight of the solids in air minus the weight of water displaced by the solids per unit of volume of soil mass; the saturated unit weight minus the unit weight of water......
Similar Terms
2730
Submerged intake
An intake structure built entirely under water.
Similar Terms
2754
Flat-crested morning glory spillway
A circular spillway composed of three parts (i) sloping weir section, (ii) free falling section, and (iii) the vertical shaft section. The water is allowed to approach the crest of the free falling section, on a flat slope before beginning its free fall (illustrated)......
Similar Terms
2811
Submerged jet diffusion stilling basin
A stilling basin where the entering jet is completely submerged below the tail water level and its energy is dissipated by the jet diffusion principle......
Similar Terms
2830
Partially submerged jet, or Partially drowned jet
A jet whose central line is below the tail water level but not too far below to cause the jet to be drowned out by the tail water during operation......
Similar Terms
2831
Submerged jet, or Drowned jet
A jet completely drowned under water.
Similar Terms
2871
Hydraulic rollers, Circular roller, Elliptical roller, Vertical roller, Horizontal roller, Inclined roller, Submerged roller, or Surface roller
Flow of water adopting circular or elliptical motion round a vertical, horizontal or inclined axis lending the appearance of a roller within or at the surface of the stream.  They are named circular or elliptical rollers according to the shape adopted while the direction of axis lends the designation of vertical, horizontal or inclined rollers.  Ac.....
Similar Terms
2880
Submerged-face gate, or Culvert gate
A gate that closes an opening having a wetted perimeter consisting of all four sides, the free surface level of the retained water being above the top of the gate opening......
Similar Terms
2923
Submerged type fixed-wheel gate, or Face type fixed-wheel gate
Fixed-wheel gate having a height less than the operating head such as at the face of a dam or intake structure or staunching on the downstream side of the gate......
Similar Terms
3029
Drowned flow, or Submerged flow
A condition of flow through or over a structure where such flow is affected by submergence or the existence of tail water......
Similar Terms
3370
Insufflation, or Air entrainment
The phenomenon of entraining appreciable percentage of air by the sheet of flow passing with high velocities over chute or spillways......
Similar Terms
3537
Drowned fall, Drowned drop, Submerged fall, or Submerged drop
A drop or fall in which the downstream or tailwater level in the channel is higher than the crest or sill level of the drop or fall; and flow and upstream water level are affected by the tailwater level......
Similar Terms
3679
Submerged orifice
An orifice with jet discharging completely under water.
Similar Terms
3680
Partially submerged orifice
An orifice with a partially free jet.
Similar Terms
3887
Pool and orifice fishway, Orifice fish ladder, or Submerged jet fish ladder
A type of pool and jet fishway in which the flow passes through orifices provided in the obstacles (baffle) near the bottom......
Similar Terms
5393
Submerged discharge
Discharge through a submerged pipe.
Similar Terms
5881
Formwork
A general term to describe the preparation, and erection, or construction of the supporting framework and forms or moulds into that the concrete is cast in situ . They may be temporary to be removed after the concrete has set or form a permanent casing of the concrete structure itself......
Similar Terms
5888
Collapsible formwork, or Panel formwork
A type of formwork assembled from previously prepared components, usually flat panels, that, upon completion of the work in one section of the structure, are removed for re-use in the next section......
Similar Terms
<<    Browsing page 1 of 2    >>