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Irrigation Dictionary : Table of Contents (members login required)\t
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Term No.Term NameTerm Description
2822Deflector hoodA curved deflector, used in jet diffusion method, to prevent the jet from being torn apart by induced eddies until it is well submerged (illustrated)......
2857Deflector, or Triangular end sillA sloped continuous wall provided at the end of a rigid apron to deflect the high velocity stream near the bed and to form ground rollers on its downs.....
1752DeflocculationReverse of flocculation; the reduction, separation or breaking of soil aggregates of clays into their individual particles......
7599Defoliant A herbicide designed to remove leaves from trees and shrubs, perhaps with intentionally lethal results......
6807DeforestationThe permanent removal of forest and undergrowth......
8620DegeneracyA term used in linear-programming parlance, meaning that there is no unique solution to the problem. .....
7618Degradation products Those chemicals resulting from partial decomposition or chemical breakdown of pesticides......
1406Degradation, or Degradation of levels1 - The lowering of specific bed levels of a channel. It is the converse of aggradation of levels. 2 - See 2159......
2159Degradation, Solodization (Solodisation), or Solotization1 - The changing of a soil to a more highly leached and a more highly weathered condition, usually accompanied by morphological changes such as the de.....
8981Degree estimateA guess estimate based on studies from index maps, and not on thumb rules, but on experience of cost of previous work of the same type built elsewhere.....
1720Degree of aeration, or Air space ratioRatio between the volume of air and the volume occupied by the voids......
1665Degree of aggregationMeasure of the proportion in which aggregates are present......
1653Degree of dispersionExtent to which soil aggregates are broken down to primary particles by any given treatment......
5044Degree of drainageA qualitative measure of the efficacy of a drainage system in an area......
5031Degree of durability of irrigationThe annual rate of variation in the depth of the groundwater level. .....
2154Degree of salinityPercentage of soluble salts in the root zones......
1802Degree of saturation1 - Ratio between the volume of water and the volume of voids. 2 - See 1774......
1774Degree of saturation (V)Percentage ratio of exchangeable cations exclusive of H+ (= S ) to total exchangeable cations inclusive of H+ (= T ), i.e.  .....
130Degrees of freedomThe degrees of freedom of a set of observations (ex- hypothesis are subject to sampling variation) is the number of independent values in the sample t.....
6003Delay electric blasting capA cap which is designed to delay the detonation for a predetermined time after the electric current is passed through it. The period of delay may be s.....
8863Delegation Involves deciding which functions to shift from the central government to semiautonomous or parastatal organisations, which implies the transfer or cr.....
5661Deleterious materials and organic impuritiesContaminants in aggregate that can adversely affect concrete strength. Determined by that quantify materials finer than 75 microns, clay, mica, organi.....
7849Delineation Defining the physical boundaries of a stream, floodplain, jurisdictional wash, etc......
8865DeliverableA product, capability to perform a service, or other result, that must be produced to complete a project. Deliverables can be produced by the project .....
3672Delivery channelWatercourse, farm lateral, or field channel......
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