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Irrigation Dictionary : Table of Contents (members login required)\t
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Term No.Term NameTerm Description
2635Effective forceThe force transmitted through a soil mass by intergranular pressure......
4958Effective full groundcoverPercentage of groundcover by the crop when ET (crop) is approaching maximum - generally 70 to 80%......
4759Effective length of a frontal nozzle-lineConventional length equal to the distance that separates the two sprinkler distributors that are farthest away from each other plus 75% of the range o.....
1094Effective porosityThe ratio between the volume of water that a saturated pervious material will yield under specified hydraulic conditions and the total volume of the m.....
1239Effective precipitationThe portion of precipitation that is available for evapotranspiration;  is able to satisfy evapotranspirative demand......
4758Effective radius of a pivotRadius of the irrigated circular area that is by convention equal to the distance from the pivot to the last distributor of the nozzle-line plus 75% o.....
4217Effective radius of a wellThe equivalent radius of a hypothetical or theoretical well without any losses with the same axis as the real well and having the same drawdown for th.....
788Effective rainfall1 – Rain that produces runoff. 2 – In irrigation practice, that portion of the total precipitation which is retained by the soil so that it is ava.....
4959Effective rooting depthSoil depth from which the crop extracts most of the water needed for evapotranspiration (also called design rooting depth)......
1654Effective size of grainThe effective size of a grain of a granular material is the diameter of the grains in an assumed material that has the same coefficient of permeabilit.....
816Effective snowmeltPart of the snow melt that reaches the channels of streams as runoff......
7656Effective soil depth 1 - The depth of soil material that plant roots can penetrate readily to obtain water and nutrients. 2 - The depth to a layer that differs sufficientl.....
2633Effective stress, Effective pressure, or Intergranular pressureThe pressure in a soil between the point of contact of the soil particles. In a state of equilibrium in a soil it is total pressure minus the pore pre.....
2662Effective unit weightUnit weight of a soil that when multiplied by the height of the overlying column of soil gives the effective pressure due to the weight of the overbur.....
1099Effective velocity (of groundwater), Actual velocity (of groundwater), True velocity (of groundwater), or Field velocity (of groundwater)The velocity measured by the volume of groundwater passing per unit time through unit cross sectional area divided by the effective porosity of the wa.....
4914Effective water useConsumptive use of water less evaporation from rainfall. It concludes transpiration and evaporation from irrigation and transpiration from effective r.....
4281Effective weight of steiningWeight of steining in water......
3363Efficiency of the hydraulic jumpThe ratio of the specific energy after the jump to that before the jump......
6358Efficiency of the resource managementThe ratio between the volume of water served upstream of the equipment and that which is actually distributed......
5643Efflorescence, White depositA light coloured coating on concrete and masonry surfaces that results from leaching of minerals from within the mass and subsequent carbonation and e.....
725Effluent1 – An outflowing branch or distributary of a main stream or lake. 2 – A liquid (water or wastewater) which flows out of a containing space. 3 –.....
7285EffluentA discharged substance, e.g. polluted (incompletely treated) water, into the environment.  .....
3515Effluent channelChannel carrying de-sedimented water from the settling basin to the canal (illustrated)......
7514Effluent limitation The maximum quantity of a specific substance or characteristic that can be present in a discharge without causing violations of water quality standard.....
1084Effluent seepage1 - Diffused discharge of groundwater to the ground surface. 2 - See 7440......
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