| Term No. | Term Name | Term Description |
| 1626 | B horizon | Is a mineral horizon in which rock structure is obliterated or is but faintly evident, characterized by one or more of the following features: a) an i..... |
| 2787 | Baby siphon type water seal, or Maramsilli baby siphon type water seal | A water seal provided by a baby siphon which by virtue of being at a lower level gets primed earlier and its issuing jet itself seals the downstream e..... |
| 2788 | Baby siphon, or Maramsilli baby siphon | A smaller siphon operating at a lower level than the main siphon in the Maramsilli baby siphon. Sometimes, the baby siphon is also referred to as `Mar..... |
| 7024 | Bacillariophyta | Diatoms...... |
| 7095 | Bacillus | A rod-shaped bacterium. ..... |
| 7985 | Back of levee, Air side of levee, Land side of levee, Outflow side of levee, Inner side of levee, Polder side of levee, or Down stream side of levee | The side of a levee away from the river, facing the protected area...... |
| 1511 | Back shore | The part of the shore covered by water during exceptional storms only, especially when combined with exceptionally high water; the zone of the shore l..... |
| 4413 | Back washing, or Back blowing | A method of well development based on the principle of surging or agitating the formation at the well by water or air pressure to prevent bridging of ..... |
| 8411 | Back-end | Any software performing either the final stage in a process, or a task not apparent to the user. A common usage is in a compiler. A compiler`s back-en..... |
| 4851 | Back-washing or Back-flushing | A method of cleaning a filter that consists in reversing the direction of the flow in such a way as to carry away the solid particles collected in the..... |
| 3223 | Backfill | 1 - Earth or other material placed behind linings or structures. 2 - Replacement of excavated material...... |
| 7997 | Backfill | The placement of fill material within a specified depression, hole or excavation pit below the surrounding adjacent ground level, as a means of improv..... |
| 5405 | Backfilling | The process of refilling a trench or an excavation around a structure...... |
| 7106 | Background concentration | The pollutant concentration that would remain if all emissions from all sources that are quantified for use in a modelling or calculation process were..... |
| 7466 | Background incidence | The level of incidence of a disease that is endemic to a region, when epidemics of the disease are not occurring...... |
| 7107 | Background level | A pollutant level that is representative of average conditions in a given area. ..... |
| 7235 | Background radiation | The radiation normally present in the lower atmosphere; from cosmic rays and earth-sources. ..... |
| 5068 | Backhoe, Backshovel | 1 - Light pullback digging shovel mounted on power driven engine with wheels similar to those of farmland tractor, and fitted in the front with a load..... |
| 6328 | Backscattering | The scattering of radiant energy into the hemisphere of space bounded by a plane normal to the direction of the incident radiation and lying on the sa..... |
| 6416 | Backslope | The hillslope position that forms the steepest, and generally linear middle portion of the slope. In profile, backslopes are bounded by a convex shou..... |
| 1415 | Backwater | 1 - Water held or forced back as a consequence of some obstruction, such as a dam or regulator, or the swelling up of the river below. 2 - A water res..... |
| 1416 | Backwater curve | The shape of the surface of water in a stream or open conduit along a longitudinal profile from a point where such a water surface is raised above its..... |
| 1417 | Backwater effect | The rise in elevation of the surface profile of a stream when the flow is retarded above a dam or any other obstruction, or is backed up into a tribut..... |
| 5406 | Backwater gate | Gate installed at the end of a tube, canal, or drain, which gets closed to prevent the downstream water from backing up into them (See also 5417)...... |
| 7087 | Bacteria | Single-celled micro-organisms that lack chlorophyll; neither plants nor animals. ..... |
