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Irrigation Dictionary : Table of Contents (members login required)\t
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Term No.Term NameTerm Description
5702HardnessResistance to indentation, abrasion, deformation, scratch, etc......
1850Hardpan, or OrtsteinA formation which occurs by precipitation of dissolved materials, such as calcium carbonate or silica, at certain depths below the surface year after .....
8369HardwareThe mechanical, magnetic, electrical, and electronic devices or components of a computer......
5715HardwoodA conventional term used to denote the wood of broad-leaved trees and it has sometimes no relationship with the physical properties of hardness or str.....
110Harmonic meanThe reciprocal of the arithmetic mean of the reciprocals of each observation......
5610Harsh mixA concrete mix that will not compact easily or give a smooth finish......
6085Haul distance, or HaulThe distance measured along the centre line or most direct practical route between the centre of the mass of excavation and the centre of mass of the .....
6083Haul roadA road designated for transportation of materials on a project......
6087HaulagewayA main tunnel connecting underground excavation areas with an exit......
7115Hazard1 - A pollutant that may have an adverse effect on man or the environment in a given situation.  2 - The effect of such a pollutant on the environment.....
8836HazardThe inherent adverse effect that a chemical or other object poses. It is that which has the potential for creating adverse consequences......
7860Hazard analysisIdentification, studies and monitoring of any hazard to determine its potential, origin, characteristics and behaviour......
7116Hazardous substanceA chemical substance or mixture that may have an adverse effect on man or the environment in a given situation.  .....
7118Hazardous wasteA waste material that by its nature is inherently dangerous to handle or dispose of.  .....
7119Hazardous waste managementThe systematic control of the collection, source separation, storage, transportation, processing, treatment, recovery, and disposal of hazardous waste.....
3157Hazen-Williams equationEquation used in the analysis of pressure pipe systems for calculation of velocity of flow or discharge  and expressed as-
V = k.C.R0.63.S0.54
where,.....
3678Head ditchThe main farm field channel......
2964Head gateThe control works or the gate itself at the entrance to a conduit......
4067Head gateA gate installed at the head of a diversion channel. It can also act as check gate......
2214Head gate structure1 - The portion of the head regulator that houses control gates. 2 - Often used in the same sense as a head regulator......
3613Head gates, Inner gates, or Upper gatesLock gates on the higher water-level side of the lock......
1150Head loss (in an aquifer)The difference in height of the groundwater table in different parts of the same aquifer resulting from resistance to flow through the aquifer......
3084Head loss, or Loss of head1 - Energy lost (converted into heat) as the result of friction, impact or eddies, expressed as a `head` per unit of flow. 2 - See 4223 and 4560......
2213Head of a canalThe point where the supply is diverted into a canal from a reservoir, river, or parent canal......
5218Head of a drainThe upstream end of a drain......
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