| Term No. | Term Name/Term Description | Action |
|---|
| 228 |
| Double-sampling plan | | In order to give the lot a second chance, double sampling is often adopted. To begin with, a relatively small sample, smaller than in the single-sampling plan, is taken and critical values for acceptance and rejection computed. If the sample produces less defective units than the acceptance critical value, the entire lot is accepted; if it produces..... | | Similar Terms |
| 862 |
| Similar Terms |
| 926 |
| Double mass curve | | Plot of successive accumulated values of one variable against the contemporaneous accumulated values of another variable...... | | Similar Terms |
| 1223 |
| Double float | | A body of a slightly negative buoyancy that moves with the stream at a known depth and whose position is indicated by a small surface float from which it is suspended...... | | Similar Terms |
| 1477 |
| River training, or Channel regulation | | 1. Engineering structures (including artificial plantations) with or without the construction of embankment, built along a river or a section thereof, to direct or lead the flow into a prescribed channel. 2. The modification of a river, by man, to allow or enhance navigation by developing a waterway of required depth either by construction of a ser..... | | Similar Terms |
| 1741 |
| Double layer | | Arrangements of two oppositely charged ions in layers near the surface of a clay particle. | | Similar Terms |
| 2340 |
| Similar Terms |
| 2890 |
| Stop log, Baulk, Plank, Regulation plank or `Kurry` | | Log, plank, cut timber, steel or concrete slab or beam fitting into the grooves made on the faces of two opposite walls or piers to close an opening for passage of water. In case where regulation is effected by such device, it is called `regulation plank` (log, kurry, baulk)...... | | Similar Terms |
| 2915 |
| Double gates | | Sluice gates used in tiers to effect any type of operation, e.g. complete closure, raising over free water surface; overshot run, undershot run or any combination of them or flows between upper and lower gates (illustrated)...... | | Similar Terms |
| 3400 |
| Similar Terms |
| 3488 |
| Double chamber sediment/silt excluder | | A sediment excluder having tunnels divided by a horizontal diaphragm into two chambers, the bottom chamber extending further into the river and removing the bottom sediment-laden water back to the river and the upper chamber works when the river is in flood and the excess discharge has to be evacuated (illustrated)...... | | Similar Terms |
| 3591 |
| Twin lock, Two-chamber lock, Double lock, or Staggered locks | | A system of two locks built parallel to each other in a two-lane lock channel and frequently having a common central wall. Where there is a longitudinal setback between the two locks for some reason (e.g. land movement), the system is known as `staggered locks`...... | | Similar Terms |
| 3602 |
| Double opposed gates, Flood tide gate, Ebb tide gate | | The sets of gates, usually, of mitre type installed in either of the two bays or both bays in tidal locks. The higher, or tidal river end, gate is called the `flood tide gate`, and the lower, or the canal end gate, is called the `ebb tide gate`...... | | Similar Terms |
| 3603 |
| Guard gates, or Double safety lock gates | | An additional pair of lock gates provided on the inner side to serve as alternative gates in case the outer set of gates need to be repaired (illustrated)...... | | Similar Terms |
| 3712 |
| Double orifice module outlet, or Siphon module outlet | | A Neyrpic module provided with two metallic covers forming a syphon. This outlet works as a semi-module as long as upstream water level does not touch the bottom edges of the two metallic covers. Then, with further rise in upstream water level it works as a semi-module orifice till the siphon primes and flow through which impinges on the jet. This ..... | | Similar Terms |
| 4018 |
| Still pond regulation | | Method of regulation of the headworks when the under-sluices in the pocket are closed, and the canal is fed from a still volume of water...... | | Similar Terms |
| 4019 |
| Similar Terms |
| 4020 |
| Semi-still pond regulation, or Semi-open flow regulation | | Method of regulation of headworks when the gates are raised up to the level of the tunnel so that the sediment is discharged through the under-sluices and the canal is fed with the relatively clear water from the upper layers of the pocket...... | | Similar Terms |
| 4021 |
| Wedge system of regulation | | Method of regulation of headworks when, on a rising river, the gate openings are increased from the flanks towards the center, and, on a falling river, the gate openings are decreased from the center to the flanks...... | | Similar Terms |
| 4022 |
| Double wedge regulation | | Method of regulation of headworks of canals, long closures are not permissible and where the discharge is such that the ratio of velocities in the river and the pocket is unfavorable : openings of the gates close to the divide wall are larger than those further away. If the barrage feeds canals from both the banks, the openings are minimum at the ..... | | Similar Terms |
| 4029 |
| Self-regulation | | Systems of regulation by an identified group of farmers / cultivators, involving practically no outside intervention for operating the system...... | | Similar Terms |
| 4039 |
| Regulation with upstream control | | Method of regulation where the flow in a canal (or in a pipeline) at right angles to a gate, is controlled by the level of the water (or pressure) measured by a sensor placed in the immediate upstream of the gate...... | | Similar Terms |
| 4040 |
| Regulation with downstream control | | Method of regulation where the flow in a canal (or in a pipeline), at right angles to a gate, is controlled by the level of the water (or pressure) measured by a sensor placed in the immediate downstream of the gate. This flow can also control the preceding gate downstream...... | | Similar Terms |
| 4041 |
| Joint regulation | | Method of regulation when the inflow in a reach of the canal depends on the flow conditions both on the upstream and downstream of this reach. The volume of water in the reach is kept fairly constant, as well as the level of water at a point situated approximately at the center of the reach. This method is called `System bevel` in France...... | | Similar Terms |
| 4042 |
| Regulation with volume control | | Method of regulation when the volume of water in the reach may vary for technical reasons but remains under the control of the operator...... | | Similar Terms |
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