International Commission on Irrigation & Drainage Commission Interationale des Irrigation et du Drainage
Term No. | Term Name | Term Description |
1628 | R horizon | A layer of continuous indurated rock, sufficiently cohesive when moistened as to make hand digging with a spade impracticable...... |
3178 | Rabi and monsoon sections of a canal | These terms are used in Indian sub-continent. The `rabi section` is the cross-sectional area of a canal in which assured supply is available for matur..... |
3985 | Rabi crop (Bangladesh, India and Pakistan) | Winter crop...... |
2692 | Race | The channel that leads water to or from a water wheel or water turbine such as head race or tail race...... |
6317 | Radar | Process or equipment that uses the reflection of beamed, repeated and timed electromagnetic-magnetic radiation to detect, locate and / or quantify obj..... |
5347 | Radial drainage pattern | Drainage pattern resembling the spokes of a wheel in which drainage channels flow radially either outward from a peak or inward toward a basin...... |
5431 | Radial flow pump | A centrifugal type pump in which the pressure for the circulating water is developed principally by action of centrifugal force...... |
3930 | Radial flow turbine | A type of turbine in which the path of any particle of water in its flow through the runner lies substantially in a plane perpendicular to the axis of..... |
2933 | Radial gate, or Tainter gate | A gate that may be pivoted or hinged with a water face that is usually arc with the centre of curvature at the pivot and water load is transferred thr..... |
2972 | Radial lock gates | A radial gate used in a lock. It is required to be raised high enough to provide necessary clearance to the passing traffic...... |
4184 | Radial well, Ranney well, or Collector well | A variation of strainer well; in this case the strainers are driven horizontally in the water-bearing strata, radiating from a central sump or open we..... |
4517 | Radial-flow pump | A pump in which fluid enters the rotating impeller near the axis of rotation and discharges with a combined radial and tangential motion...... |
3579 | Radial-gate spillway | Overflow spillway utilizing radial gates; when automatic, will automatically open or close with the rise or fall of the water surface in the canal...... |
7230 | Radioactive decay | Disintegration of the nucleus of unstable nuclides by spontaneous emission of charged particles and/or photons...... |
7238 | Radioactive tracer | Radioactive material detectable by its nuclear radiation; useful for tracing sources of water, even at very low concentrations. ..... |
6262 | Radioactive tracer | Material detectable by its emitted ionizing radiation and suitable for water tracing even at very low concentrations...... |
7239 | Radioactive waste | Any waste that contains radioactive material; especially in concentrations that exceed amounts allowed by law. ..... |
7226 | Radioecology | The study of the effects of radiation on plants and animals in natural communities...... |
7227 | Radioisotopes | Radioactive forms of chemical compounds...... |
7229 | Radionuclides | Any nuclide that emits radiation...... |
4218 | Radius of a well | The radius of the inside of the well casing or screen, or the radius of the bore hole for an uncased well (illustrated)...... |
4239 | Radius of influence | The radius of the circle of influence (illustrated)...... |
3853 | Raft foundation | A layer of concrete, usually reinforced, extending under the whole area of columns, piers and abutments and projecting outside their base periphery; u..... |
4681 | Railing | Agricultural method of brush removal from a field using a tractor-drawn railway rail...... |
773 | Rain | Precipitation in the form of liquid water drops greater than 0.5 mm...... |
The Multilingual Technical Dictionary (MTD) is an e-dictionary of all technical terms related to irrigation, drainage, flood management, environment, river training, and allied disciplines of the water sector. Any term/ definition can be printed/copied with the option to download/updates of terms from the ICID website. The MTD enriches the process of sharing and exchange of experiences and has proven to be highly useful for engineers, researchers, students, professionals, planners, designers, academics and all others related to the field of irrigation and drainage. It is more helpful for professionals outside the water sector, in simplifying the technical jargon and to understand the sectoral nuances easily.
As part of ICID's flagship activity, it was first published in English and French languages in 1967, the – 4th edition of the MTD (English-French) was brought out on CD-ROM in the year 2002. Currently, we are following the 5th edition released in 2009, which defines 9,370 technical terms in Chinese, Japanese and Russian, besides English and French. This online version of MTD is based on the 5th edition's DVD format. This version includes 9370 technical terms with matching English and French translation. The DVD version also includes terms collected in Chinese, Japanese and Russian languages with the active support received from respective National Committees. However, full integration with online versions has not taken place due to the difference in available translation editions/ versions. National Committees of Iran, China, Japan, Russia, Korea, and India are working on the translation/ updating part to match the present online version.
The DVD version of the Multilingual Technical Dictionary (MTD) is available for download through the 'Members only' section. After installation, please download the MTD 2.0a Update Patch (2002 version) and update the required files as suggested in the Patch before running the application.
MTD 2.0a Update Patch
This update is for the users of MTD 2.0 who are working on a French Windows Operating System.
Please download the .jar file (icidmtd.jar [126 KB]) and replace the existing file installed in your C:\Program Files\icid-mtd\lib folder.
C:>cd\progra~1\icid-mtd\lib
C:\Program Files\ICID-MTD\LIB