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
177
Z – Distribution
The distribution of a logarithmic transformation of a variance ratio. If there are two independent estimates of the population variance S12 and S22 based on n1 and n2 degrees of freedom, the Z -function is defined as .....
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4452
Zawafa
An Egyptian water lifting device used for lifts exceeding two metres. It is a modern version of the chain and bucket type of Persian wheel but its design results in the water being lifted only a small distance above the delivery level......
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401
Zepto
img:equations//383_402_e.jpg
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2667
Zero air voids unit weight
The weight of solids per unit volume of a saturated soil mass.
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708
Zero moisture index
The index of moisture when the precipitation analysed month by month is just adequate to supply all water needed for maximum evaporation and transpiration in the course of a year......
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5000
Zero tillage
A system whereby crops are planted into the soil without primary tillage beforehand.
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7621
Zero tolerance
A policy that prevents an agricultural commodity from being shipped or sold if it contains detectable levels of any chemical that has been shown to be hazardous (i.e. toxic, carcinogenic, etc.) to warm blooded animals......
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8335
Zero-wait state
A condition that results when no delays are inserted into the system software to deliberately detain operation of the CPU. This can be done with high-speed memory and proper design of computer architecture. Zero-wait state is desirable for the high-speed operation of a computer......
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1897
Zerophytes, or Xerophytes
Plants which can subsist with a small amount of moisture, as a desert plant or plant under conditions where excess of salts makes it difficult to take in water......
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384
Zetta
img:equations//383_402_e.jpg
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5180
Zigzag drainage system
System in which field drains as well as mains are constructed zigzag to reduce high velocities. It is probable that this system is used in mechanized agriculture. In order to lower the running water, drop structures could also be installed (illustrated)......
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4817
Zigzag nozzle-line
a single nozzle-line skirting round each tree in a row in an orachard, sometime to the right, sometime to the left.
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2522
Zone
A vertical portion usually of a masonry dam between two horizontal lines of its cross section adopted for stress analysis. .....
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2490
Zone grouting
A process of providing a grout curtain whereby a whole section of the curtain is stage drilled and grouted to a limited depth before any holes are drilled or grouted beyond that depth......
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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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1143
Zone of fluctuation of water table, or zone of phreatic fluctuations
The zone through which the water table fluctuates from its highest to its lowest level within the formation, in response to the discharge and recharge conditions......
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1148
Zone of permanent non saturation
The strata above the highest water level reached in an aquifer when the groundwater table moves up and down in response to seasonal and shorter term weather changes; marks the lower limit of the permanent non saturation zone.  .....
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1149
Zone of permanent saturation
The saturated portion of an aquifer that lies below the lowest water level reached when the  groundwater table moves up and down in response to seasonal and shorter term weather changes......
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978
Zone of rock fracture
The upper part of the lithosphere, in which rocks are under stresses less than those required to close their interstices by deformation of the walls of the interstices. It is the part of the lithosphere between the surface of the earth and the lower limit of the porous water-bearing rock formations......
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982
Zone of rock-flowage-and-fracture
That part of the earth crust lying between the zone of the rock fracture and the zone of rock flowage. In it, the strongest rocks behave as in the zone of rock fracture and the weakest rocks as in the zone of rock flowage......
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981
Zone of saturation
That part of the earth crust where the functional interstices of permeable rock or earth are completely filled with water under positive hydrostatic pressure, that is, pressure in excess of atmospheric pressure. It is that portion of the earth crust that supplies water to springs and wells and which contains the groundwater. Strictly speaking, part.....
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980
Zone of weathering
The outer layer of the earth crust of the earth, including the exposed surface and that part which, as a result of porosity, cracking, and jointing, is subject to the destructive action of atmospheric influence, rain, frost and oxidation......
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6702
Zoogeography
The study of the geographical distribution of animals.
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6916
Zoology
The study of all aspects of animal life.
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8336
Zoom
The process of proportionately enlarging or reducing an image displayed on a computer monitor.
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