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
1299
Tidal flats
Areas of nearly flat, barren mud periodically covered by tidal waters.
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2145
Alkali flat
A sterile plain containing an excess of alkali, typically at the bottom of an underdrained basin in an arid region.
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2157
Alkalinization (Alkalinisation)
The formation of Na-adsorption compounds through base exchange.
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2179
Alkali grass
Any of several grasses of the genus Puccinellia that grow in saline situations.
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2180
Alkali heath
A Californian undershrub with revolute leaves, pinkish flowers in small terminal clusters, and linear many-seeded capsules......
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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......
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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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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)......
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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......
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5065
Alkaline soil
A soil that has an alkaline reaction, i.e. a soil for which the pH reading of the saturated extract is higher than 7.0.
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5131
Non-saline alkali soil
A soil containing sufficient exchangeable sodium that interferes with the growth of plants and which does not contain sufficient quantities of soluble salts......
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5641
Alkali aggregate reaction
The chemical deterioration caused by reaction between alkalies in cement and mineral constituents of concrete aggregates......
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5907
Flat submerged formwork
Submerged formwork, prefabricated, consisting of wood, steel, or reinforced concrete panels and brace work.
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6224
Lay-flat pneumatic valve )
A flat, rectangular tube that, when inflated, forms a closure within the underground portion of a turnout pipe. It is secured to the turnout pipe at the upstream end and when deflated or in an open position conforms to the curvature of the lower half of the pipe wall......
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6456
Deflation
The complete removal of loose material by the wind leaving rocks exposed to continuous weathering.
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7037
Alkaliphobic
Avoiding alkaline conditions.
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7134
Alkali or Base
A substance that, when dissolved in water, has the capacity to neutralize acids.
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7682
Salt flat
The salt‑encrusted bottom of a desiccated lake.
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7811
Alkali
A term used to describe soils having soluble mineral layers of basic pH, present in quantities detrimental to agriculture in arid regions. May have high sodium carbonate, sodium sulphate, or potassium carbonate. .....
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7812
Alkalinity
1 - The quality of being alkaline or basic in pH, i.e., pH greater than 7. May be expressed as the amounts of carbonates, bicarbonates and hydroxides present in the water. 2 - The ability to neutralize an acid. .....
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9138
Consolidated rate, or Flat rate
This is the water rate combined with the land revenue and is fixed on the settlement principle. It is charged on the irrigable area irrespective of the nature of crops grown......
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