| Term No. | Term Name | Term Description |
| 2635 | Effective force | The force transmitted through a soil mass by intergranular pressure...... |
| 4958 | Effective full groundcover | Percentage of groundcover by the crop when ET (crop) is approaching maximum - generally 70 to 80%...... |
| 4759 | Effective length of a frontal nozzle-line | Conventional length equal to the distance that separates the two sprinkler distributors that are farthest away from each other plus 75% of the range o..... |
| 1094 | Effective porosity | The ratio between the volume of water that a saturated pervious material will yield under specified hydraulic conditions and the total volume of the m..... |
| 1239 | Effective precipitation | The portion of precipitation that is available for evapotranspiration; is able to satisfy evapotranspirative demand...... |
| 4758 | Effective radius of a pivot | Radius 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..... |
| 4217 | Effective radius of a well | The 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..... |
| 788 | Effective rainfall | 1 – 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..... |
| 4959 | Effective rooting depth | Soil depth from which the crop extracts most of the water needed for evapotranspiration (also called design rooting depth)...... |
| 1654 | Effective size of grain | The 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..... |
| 816 | Effective snowmelt | Part of the snow melt that reaches the channels of streams as runoff...... |
| 7656 | Effective 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..... |
| 2633 | Effective stress, Effective pressure, or Intergranular pressure | The 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..... |
| 2662 | Effective unit weight | Unit 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..... |
| 1099 | Effective 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..... |
| 4914 | Effective water use | Consumptive use of water less evaporation from rainfall. It concludes transpiration and evaporation from irrigation and transpiration from effective r..... |
| 4281 | Effective weight of steining | Weight of steining in water...... |
| 3363 | Efficiency of the hydraulic jump | The ratio of the specific energy after the jump to that before the jump...... |
| 6358 | Efficiency of the resource management | The ratio between the volume of water served upstream of the equipment and that which is actually distributed...... |
| 5643 | Efflorescence, White deposit | A light coloured coating on concrete and masonry surfaces that results from leaching of minerals from within the mass and subsequent carbonation and e..... |
| 725 | Effluent | 1 – 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 –..... |
| 7285 | Effluent | A discharged substance, e.g. polluted (incompletely treated) water, into the environment. ..... |
| 3515 | Effluent channel | Channel carrying de-sedimented water from the settling basin to the canal (illustrated)...... |
| 7514 | Effluent limitation | The maximum quantity of a specific substance or characteristic that can be present in a discharge without causing violations of water quality standard..... |
| 1084 | Effluent seepage | 1 - Diffused discharge of groundwater to the ground surface. 2 - See 7440...... |
