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
79
Mass diagram, Mass curve, Flow integrated curve, or Summation curve
A diagram, curve, or graph, plotted with rectangular coordinates, representing a summation (integration) of all preceding quantities up to a point. Each ordinate being equal to the sum of preceding terms in the series, with the corresponding abscissa representing elapsed time, etc. The diagram is used extensively in storage and regulation studies p.....
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817
Snowmelt rate
The rate of conversion of snow into water within a snow pack.
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875
Infiltration rate
1 – The rate at which water penetrates the surface of a soil. The term is usually used to refer to water occurring as precipitation, but is also applied to water flowing or standing upon soil. 2 – The rate at which groundwater enters an infiltration ditch, gallery, drain, sewer or other underground conduit......
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890
Evaporativity, Evaporative capacity, Evaporation power, Potential rate of evaporation, or Evaporation potential
Rate of evaporation under existing atmospheric conditions from a free surface of water that is chemically pure and has the temperature of the surrounding atmosphere......
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914
Percolation rate
The rate (in units of velocity) at which water flows from top soil to subsoil under specific conditions.
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979
Zone of aeration, Aeration zone, Zone of suspended water, or Unsaturated zone
That portion of the lithosphere in which the functional interstices of permeable rock or earth are not (except temporarily) filled with water under hydrostatic pressure; that is, the interstices are either not filled with water or are filled or partly filled with water that is held by capillarity. The zone of aeration comprises the area where fring.....
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1118
Annual depletion rate
The average rate over a period of years at which withdrawals deplete the storage in groundwater reservoir.
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1141
Saturated zone
That part of an aquifer in which all voids saturated or nearly saturated with water.
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1142
Unconsolidated aquifer
An aquifer comprised mainly of gravels or other porous materials that may not be structurally stable when penetrated by a well bore......
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1156
Discharge, or Rate of flow
The volume of water that flows past a particular cross section of a channel or conduit in a unit of time.
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1299
Tidal flats
Areas of nearly flat, barren mud periodically covered by tidal waters.
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1495
Wire crate spur
A spur made of stones encased in well-knitted wire crates.
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1574
Saturated sediment discharge
When the required materials are available in the bed to generate transportation capacity, the sediment materials that pass over the bed are stated to have reached the saturation level......
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1634
Indurated
Cemented, hardened, or rocklike condition of soil which will not soften when wetted.
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1646
Soil separates
Mineral particles, less that 2.0 mm. in equivalent diameter, ranging between specified size limits. The names and the size limits of separates recognized in the U.S. are : very coarse sand, 2.0 to 1.0 mm ; coarse sand, 1.0 to 0.5 mm; medium sand, 0.5 to 0.25 mm ; fine sand, 0.25 to 0.10 mm; very fine sand, 0.10 to 0.05 mm; silt, 0.05 to 0.002 mm; a.....
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1771
Unsaturated soil solution
1 - A soil solution having hydrogen ions among the cations in its exchange complex. 2 - See 1801.
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1773
Saturated soil
1 - Soil holding the amount of base in order to have a selected pH; such a soil is said to be saturated up to that pH. 2 - Soil having all pore spaces filled up with water. .....
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1801
Unsaturated soil
1 - Soil having the pore spaces only partially filled up with water. 2 - See 1771.
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1803
Saturated soil paste
A condition occurring when a soil sample and distilled water are mixed for laboratory test analysis, usually to determine chemical composition of the solution. At saturation the soil paste glistens as it reflects light and flows slightly when the container is tipped. The paste slides freely and cleanly from a spatula for a soil at its saturation pe.....
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1956
Net assimilation rate
The rate of increase in dry matter per unit area of leaf surface.
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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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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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2549
Perforated cutoff, or Semi-impervious cutoff
A cutoff made up of non-watertight material as steel sheet piles usually provided on the downstream side to help decrease pressures......
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2587
Creep rate, or Creep ratio
The ratio of creep length to the difference in water levels at upstream and downstream of a hydraulic structure (effective head)......
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