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Irrigation Dictionary : Table of Contents (members login required)\t
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Term No.Term NameTerm Description
7867Natural hazardsNatural processes or phenomena occurring in the biosphere that may constitute a damaging event. Natural hazards can be classified by origin namely: ge.....
1523Natural leveesHigh banks formed along the channel edges during high floods due to silting along the banks......
7102Natural pollutantA substance, not of man-made origin, that produces adverse environmental effects when present in excess.....
5557Natural pozzolansPozzolans occurring in nature are used as such in natural state or after grinding them to required fineness. These include volcanic ash and its deriva.....
1135Natural rechargeWater that gravitates to the zone of saturation under natural conditions......
5773Natural resinsInclude all the naturally occurring resins that are used in varnish manufacture......
6783Natural resourcesThose natural elements of the environment that are regarded as useful for consumption and/or enjoyment by mankind......
8643Natural Resources VectorVector of natural resources; when activities use natural resources, upper maximum of natural resources becomes constraints to the activities. This vec.....
6742Natural selection The process of survival of the fittest, by which organisms that adapt to their environment survive and those that do not disappear. .....
3308Natural surface level, or Ground levelsLevels above datum of the natural surface line......
3307Natural surface lineLine joining points of the natural ground surface parallel to or along the centre line of the bed of a canal......
1089Natural water tableThe surface at which the hydrostatic pressure of the groundwater is equal to the atmospheric pressure......
4145Natural well An abrupt depression in the land surface, not made by human agency, which extends into the zone of saturation but from which water does not flow to t.....
4180Naturally-filtered well, Naturally-screened well, or Naturally gravel- packed well A well that taps an aquifer imperfect sort or at least partly incoherent material, and whose specific capacity has been increased by the removal of th.....
6805Nature reserveAn area of land and/or water, managed primarily to safeguard the fauna, flora and physical features that it contains......
3170Navier-Stokes equationMomentum equation applied to a small control volume of incompressible fluid; usually written in vector notation. .....
9167Navigation benefitsDirect benefits based on saving to shippers compared to alternative cost, saving in time and operating cost from improvement of an existing waterway, .....
4630Navigation canalsCanals constructed primarily for shipping......
8804Navigation projectProject meant solely or primarily for navigation purposes, although in the latter case it may incidentally serve other purposes......
3320Navigation structuresStructures built in canals and canalized or navigable waterways where headway and other facilities exist or are provided for the direct passage of ves.....
1638NazzazA compact, impermeable pan, concretionary in character, occurring at a slight depth below the surface of red sandy soils in the Levant......
2017Neap tideA tide occurring near the time of the quadrature of the moon with the sun. The neap tidal range is usually 10 to 30 per cent less than the mean tidal .....
1311Neap tidesExceptionally low tides that occur twice each month when the earth, sun and moon are at right angles to each other......
6304Near infraredThe shorter wavelengths in the infrared region, extending from about 0.7 micrometres (visible red) to around 2 or 3 micrometres......
6750Nearctic Zoogeographical region that includes North America to approximately the middle of Mexico and Greenland......
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