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Irrigation Dictionary : Table of Contents (members login required)\t
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Term No.Term NameTerm Description
8371Impact PrinterA computer-driven mechanical imprinting device where the characters are formed by the printer-head key striking a ribbon to imprint the character’s .....
4780Impact resistance factorA parameter for specifying the capacity of an aluminium tube to resist external loads or impacts without permanent deformation......
2813Impact stilling basin, or Impact basinA type of stilling basin to serve the need for relatively smaller basins for the energy dissipation independent of tail water variations or any tail w.....
4541ImpellerA rotating set of vanes in a pump, etc., designed to impel rotation of a mass of fluid......
7769Imperfect drainage Drainage that does not remove water fast enough, such that waterlogging may persist for two or more weeks after rainfall or the ground-water table may.....
2257Impermeable fixed weir, or Solid fixed weirA fixed weir whose water bearing surfaces are of watertight construction. It may be built with timber, masonry, concrete (plain or reinforced), steel,.....
7649Impermeable layer A layer of soil resistant to penetration by water, air, or roots......
1132Impermeable materialMaterial that does not permit water to move through it at a perceptible rate under the hydraulic gradients normally present......
1486Impermeable spurA spur made up of earth or rockfill, armoured with resistant material like stone, wire boulder crates or cement concrete blocks......
2256Impermeable weirA weir made up of impermeable material, such as rock, stone, brick masonry, concrete, steel, or timber. It can be of a fixed or movable type......
2542Impervious blanketBlanket, when the covering material is impervious......
8016Impervious coreA core of an earth dam or levee constructed of puddled or compacted clay or other material, designed to place a water barrier between the upstream and.....
5398Impervious floorA soil base that does not permit the penetration or passage of water......
7662Impervious soil A soil, often clay, through which water will percolate very slowly, or not at all.  If the former, a better description is ‘slowly-pervious soil’......
7532Implementation plan (environmental) A proposed course of action to achieve (and maintain) some environmental standard......
1998ImpolderingReclamation of a level area which in its original state was subject to high water levels permanently or seasonally, originating from either the surfac.....
1263ImpoundmentA body of water confined by a dam, dike, floodgate or other barrier......
8839ImpoundmentBody of water formed by collecting water, as by a dam......
4395Impression blockA tool used prior to a fishing tool for the purpose of ascertaining the position and shape of the top of a broken or lost tool in a bore hole......
5127Improved drainage or Artificial drainageAny technique used to improve the natural drainage of the land......
4440Improved water wheel, ChakramA modification of the paddle wheel in which the lower parts of the paddles are placed in a close fitting box to reduce spilling of the water from the .....
4508Impulse pumpA type of pump that raises water by periodic application of a force suddenly applied and suddenly discontinued. The hydraulic ram is the most common e.....
3926Impulse turbineA type of turbine in which all the available energy in the fluid is converted into kinetic energy before it acts on the runner of the turbine......
6286Impulse, pulseA unidirectional flow of current of non-repeated wave......
7154ImpurityA chemical substance that is unintentionally present with another chemical substance. .....
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