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Irrigation Dictionary : Table of Contents (members login required)\t
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Term No.Term NameTerm Description
1628R horizonA layer of continuous indurated rock, sufficiently cohesive when moistened as to make hand digging with a spade impracticable......
3178Rabi and monsoon sections of a canalThese 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.....
3985Rabi crop (Bangladesh, India and Pakistan)Winter crop......
2692RaceThe channel that leads water to or from a water wheel or water turbine such as head race or tail race......
6317RadarProcess or equipment that uses the reflection of beamed, repeated and timed electromagnetic-magnetic radiation to detect, locate and / or quantify obj.....
5347Radial drainage patternDrainage pattern resembling the spokes of a wheel in which drainage channels flow radially either outward from a peak or inward toward a basin......
5431Radial flow pumpA centrifugal type pump in which the pressure for the circulating water is developed principally by action of centrifugal force......
3930Radial flow turbineA 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.....
2933Radial gate, or Tainter gateA 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.....
2972Radial lock gatesA radial gate used in a lock. It is required to be raised high enough to provide necessary clearance to the passing traffic......
4184Radial 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.....
4517Radial-flow pumpA pump in which fluid enters the rotating impeller near the axis of rotation and discharges with a combined radial and tangential motion......
3579Radial-gate spillwayOverflow spillway utilizing radial gates; when automatic, will automatically open or close with the rise or fall of the water surface in the canal......
7230Radioactive decayDisintegration of the nucleus of unstable nuclides by spontaneous emission of charged particles and/or photons......
6262Radioactive tracerMaterial detectable by its emitted ionizing radiation and suitable for water tracing even at very low concentrations......
7238Radioactive tracerRadioactive material detectable by its nuclear radiation; useful for tracing sources of water, even at very low concentrations.  .....
7239Radioactive wasteAny waste that contains radioactive material; especially  in concentrations that  exceed amounts allowed by law.  .....
7226RadioecologyThe study of the effects of radiation on plants and animals in natural communities......
7227RadioisotopesRadioactive forms of chemical compounds......
7229RadionuclidesAny nuclide that emits radiation......
4218Radius of a wellThe radius of the inside of the well casing or screen, or the radius of the bore hole for an uncased well (illustrated)......
4239Radius of influenceThe radius of the circle of influence (illustrated)......
3853Raft foundationA layer of concrete, usually reinforced, extending under the whole area of columns, piers and abutments and projecting outside their base periphery; u.....
4681RailingAgricultural method of brush removal from a field using a tractor-drawn railway rail......
773RainPrecipitation in the form of liquid water drops greater than 0.5 mm......
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