International Commission on Irrigation & Drainage Commission Interationale des Irrigation et du Drainage

Multilingual Technical Dictionary (MTD)
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Term No.Term Name/Term DescriptionAction
928
S-curve, or S-curve hydrograph
A graph showing the summation of the ordinates of a series of unit hydrographs spaced at unit-rainfall duration intervals. It represents the hydrograph of unit rate of rainfall excess continued indefinitely. If the ordinates of the S-curve are expressed as a percentage of the total unit hydrograph volume and the abscissa as unit of time or as perce.....
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1776
S-Value
Milliequivalents of exchangeable metallic cations in 100 grams of exchange (absorbing) complex.
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8298
S-Video
A video format offering a higher quality signal than composite video, but a lower quality than component video. This mid-level format divides the signal into two channels luminance and chrominance......
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4137
Sacrosanct land
Land unlikely to yield a tangible benefit from flood alleviation, such as common land, nature reserves, recreation areas......
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2773
Saddle siphon, or Hood siphon
A siphon having its duct formed of a U-shaped hood. The inlet lip of the hood is submerged below the full reservoir level and that of the outlet lip terminates in a water seal formed by various devices. The siphons are sometimes named according to the water seal provided (illustrated)......
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2816
SAF basin
Stilling basins designed by Saint Anthony Falls Hydraulic Laboratory, USA, for drainage structures. They have an end sill and a row each of chute blocks and floor blocks (illustrated)......
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5389
Safe velocity
The greatest velocity at which it is possible to let water flow in a drainage channel without causing erosion or washing of the banks......
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3971
Safe yield
With reference to either the surface-water or groundwater supply, the rate of diversion or extraction for consumptive use that can be maintained indefinitely, within the limits of economic feasibility......
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2387
Safe yield of reservoir basin, or Safe yield of catchment
The annual runoff flowing from the basin into the reservoir that can be depended upon for utilization.
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5999
Safety fuse
A device consisting of a train of enclosed black powder that is used as a medium to convey a flame to an explosive. The flame will travel along the fuse at a predetermined uniform rate......
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1208
Sag correction
The amount by which soundings must be reduced to obtain true vertical values.
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3757
Sag pipe, or Sag line
Terms sometimes used for syphon or inverted siphon.
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4608
Sailab irrigation (a term used in India and Pakistan)
Irrigation by flood waters which are allowed to spread, without control, first on the bottom of rivers, then the surplus water flowing out through wasteway. Water thus stored in the soil enables raising a crop. .....
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2144
Sajong soils, or Shachiang soils
Soils containing 85 per cent calcium carbonate and having lime concentrations of ginger root size.
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4451
Sakia, Saqia, Saqiya, Sakieh or Sakiyeh
A kind of water wheel used in Egypt for lifting water up to two metres. It consists of a double-sided all metal wheel that has volute-shaped compartments within it. These compartments are open at the periphery of the wheel and curve inward toward a central opening around the axis. When the wheel revolves, water is scooped up at the outer edge and i.....
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7815
Salic horizon
Soil horizon enriched by soluble salts.
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8807
Salient features of a project
The important data of a project briefly listed by which its nature, magnitude and scope could be gauged.
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6980
Salientia
Toads.
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7731
Saline
Referring to water that contains dissolved salts, usually at concentrations from 10 000 to 33 000 mg/l.
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7732
Saline contamination
Contamination of water by intrusion of salt water.
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5147
Saline sodic soil
A soil with sufficient exchangeable sodium to interfere with the growth of most crop plants and containing appreciable quantities of soluble salts......
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5148
Saline soil
A non-sodic soil containing soluble salts in such quantities that they interfere with the growth of most plants.
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2138
Saline soil
A non-sodic soil containing sufficient soluble salt to impair its productivity. The electrical conductivity of the saturation extract is greater than 2 mmhos per centimeter at 25oC. Crop plant growing is mostly inhibited in saline soils......
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8815
Salinity control
Abatement or prevention of salt water contamination of agricultural, industrial and municipal water supplies, or reducing alkaline salts and preventing deterioration of cultivable lands......
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9170
Salinity control benefits
Benefits based on value of damage prevented, reduction in costs, and increased use, similar to flood control.
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