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Irrigation Dictionary : Table of Contents (members login required)\t
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Term No.Term NameTerm Description
376Heat capacity, Entropyimg:equations//374_380_e.jpg.....
1970Heat injuryThe term is often used in a collective sense to include all types of plant damage by excessively high temperature......
5535Heat of hydration1 - Heat released during any given time period following the mixing of cement with water. 2 - A determination of the heat generated during the chemica.....
1758Heat of wettingThe heat evolved when dry soil is wetted. It is expressed in calories per gram of dry soil. See 1004......
1968Heat rigorA state of plants when they may survive for brief periods at temperatures above the maximum......
2097HeathlandShallow acid peat land......
2670HeaveUpward movement of soil caused by expansion or displacement resulting from phenomena such as moisture absorption, removal of overburden, driving of pi.....
8871Heavily modified water bodyA body of surface water which as a result of physical alterations by human activity is substantially changed in character.....
4279HeavingHorizontal or lateral displacement of soil formation surrounding the well hole while pumping during digging. Heaving occurs when the differences in he.....
7139Heavy metalA metallic element; such as mercury, chromium, cadmium, arsenic, and lead, with high molecular weights. Often toxic to living organisms at low concent.....
5811Heavy-duty revetmentA relatively thick, heavy-duty asphalt surfacing designed to resist severe erosion and abrasion......
599Hectaresimg:equations//596_630_e.jpg.....
391Hectoimg:equations//383_402_e.jpg.....
2467Heel line, or Upstream toe lineThe line joining the upstream slope or face of a dam with the valley floor or the ustream blanket......
3622Heel postA post to which the lock gate is hinged......
2838Height of bucket lipThe distance from the lowest concave surface of the bucket to the top of the lip (illustrated)......
3357Height of hydraulic jumpThe difference between depth of water downstream and upstream of the jump......
1568Hen-cooping, or A-frame protectionA cribwork used in Australia for bank protection, made of three lots of logs with their ends meeting so as to form a triangular tunnel which is filled.....
9319HerbaceousFlowering, non-woody plants......
5319HerbicideAny chemical which controls weeds; weed killers in the form of a liquid or powder......
7596Herbicide A chemical that controls or destroys undesirable plants......
6960HerbivorePlant‑eating animal......
5175Herringbone drainage systemA system in which the main drain and the field drains have a herringbone arrangement (illustrated)......
7792Herringbone layout A composite layout drainage system with laterals meeting the leader at angles <90 degrees......
5114Herringbone systemA system in which the collector drains and the field drains are constructed at an angle (generally less than 90o) to the main drain, which forms a `sp.....
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