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

Multilingual Technical Dictionary (MTD)
<<    Browsing page 1 of 9    >>
Term No.Term Name/Term DescriptionAction
1623
O horizon
Is an organic horizon formed or forming from an accumulation of organic material deposited on the surface, that is not saturated with water for more than a few days a year and contains 20% or more organic carbon. O horizons are the organic horizons that develop on top of some mineral soils. For example, the raw humus which covers certain acid soils.....
Similar Terms
4979
Oasis effect
Vertical energy transfer from air to the crop; effect of dry fallow surrounds on the microclimate of a relatively small acreage of land where an air mass moving into an irrigated area will give up much sensible heat. For small fields this may result in a higher ET (crop) as compared to predicted ET (crop) using climatic data collected inside the ir.....
Similar Terms
5870
Obelisk
An upright four-sided pillar, gradually tapering as it rises and terminating in a pyramid. It is ordinarily monolithic, used as a water diversion structure......
Similar Terms
8232
Object code
Machine language code produced by a translator program, such as an assembler, interpreter, or compiler. Instructions in object code can be executed by a Central Processing Unit (CPU)......
Similar Terms
8233
Object programme
The machine-language programme that is the final output of a coding system.
Similar Terms
8645
Objective function
Some rule for assessing, in an objective numerical manner the performance of the systems, using one or more chosen criteria in order to enable a comparison to be made between alternative systems......
Similar Terms
9342
Obligate Species
Species restricted to one particularly characteristic mode of life.
Similar Terms
316
Oblique perspective, or Three-point perspective
Perspective where all the principal lines are oblique.
Similar Terms
8947
Oblique photograph
Photograph taken with a single-lens camera with the axis at an appreciable angle to the vertical, generally at 45o or more. A high oblique photograph is one that includes the horizon; a low oblique photograph does not include the horizon......
Similar Terms
308
Oblique projection
The representation of objects on a single plane by means of their projections, the projecting lines making angles other than 90o with the plane. The object is usually placed with the front face, or two of the principal axes, parallel to the plane of projection. The angle of the projections with the plane is usually 45o and the drawing is then calle.....
Similar Terms
298
Oblique sections
Sections made at various obliquities or angles.
Similar Terms
2307
Oblique weir, or Skew weir
A weir with its crest inclined to the direction of flow as seen in the plan (illustrated).
Similar Terms
27
Observation error
The difference between an observed value of a quantity and a value adapted as representing the ideal or true value of that quantity. Errors of observations are composed of either one or both of two general classes of errors, accidental errors and systematic errors. The algebraic sign of an observation error is determined from the equation : Error =.....
Similar Terms
5132
Observation well
A hole dug or augered into the ground for the purpose of observing fluctuations in the elevation of the groundwater table......
Similar Terms
4187
Observation well, Groundwater station, Monitor well, or Piezometer
1 - A non-pumping well used for observing the elevation of the water table or the piezometric surface. 2 - Well used to watch for some anticipated, but generally undesirable conditions, such as encroachment of a salt-water front or a pollutant introduced to groundwater. 3 - See 5141 and 8692......
Similar Terms
2786
Obstruction weir type water seal
A water seal provided by a low weir (subsidiary dam) constructed downstream of the body wall (dam) (illustrated).
Similar Terms
3802
Occupation crossing, Access, Accommodation
Crossing (bridge or culvert) that gives access between two portions of a farmer`s land. In Australia also called `access` or `accommodation`......
Similar Terms
9136
Occupier`s water rate, or Crop water rate
Water rate charged on the area actually irrigated and which usually varies with the nature of crop or crops, the quantity of water normally required by the crop, the scarcity or abundance of water at the time of supply, and the value of the crop......
Similar Terms
9343
Ocean Conveyor Belt
The theoretical route by which water circulates around the entire global ocean, driven by wind and the thermohaline circulation......
Similar Terms
7868
Ocean flooding
Overflow onto lowlands by salt water, due to tidal action, storm surge or tsunamis, i.e. seismic sea waves. Land forms subject to ocean flooding including beaches, marshes, coastal lowlands and low-lying interdune areas......
Similar Terms
9344
Ocean Ventilation
Downwelling of water from near the surface to the deep ocean. See also deepwater formation.
Similar Terms
1295
Oceanic
Inhabiting the sea where it is deeper than 200 metres.
Similar Terms
8494
ODBC
Open DataBase Connectivity, a standard for accessing different database systems. There are interfaces for Visual Basic, Visual C++, SQL and the ODBC driver pack contains drivers for the Access, Paradox, dBase, Text, Excel and Btrieve databases. .....
Similar Terms
8234
Off-line
1 - Descriptive of a system and of the peripheral equipment or devices in a system in which the operation of peripheral equipment is not under the control of the central processing unit.  2 – See 8235......
Similar Terms
8495
Office, Microsoft Office
Microsoft’s bundles of productivity tools. Different versions contain some or all of Microsoft Word, Microsoft Excel, Powerpoint, Outlook, Microsoft Access, Microsoft Publisher, Microsoft Front Page, Microsoft Team Manager, Microsoft Project, Microsoft Schedule+, Microsoft Internet Explorer, Small Business Financial Manager, Automap Streets Plus......
Similar Terms
<<    Browsing page 1 of 9    >>