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
440
Discharge and yield
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552
Discharge and yield
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851
Yield of drainage basin, Annual yield of drainage basin
Total volume or flow from a drainage basin for a stipulated period of time, e.g. ‘annual yield of drainage basin’ is the mean annual runoff......
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915
Specific yield
1  The ratio of the volume of water that can be removed by free drainage from a saturated soil to the total volume of the soil. Also called `drainage or drainable porosity`. 2  The ratio of that volume of water that a rock or soil, after being saturated, will yield by gravity, to the volume of rock or soil. 3 - See 5277......
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1116
Economic yield
The maximum rate at which water can be withdrawn from an aquifer throughout the foreseeable future without depleting the supply or altering the chemical character of the water to such an extent that withdrawal at this rate is no longer economically possible. The term may be applied with respect to a single user or all users in a groundwater basin......
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1117
Physical yield limit, or Potential yield
The greatest rate of artificial withdrawal from an aquifer that can be maintained throughout the foreseeable future without regard to cost. Equal therefore to the present recharge, or that anticipated in the foreseeable future, less the unrecoverable natural discharge......
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1357
Sediment yield
The total sediment outflow from a watershed or past a given location in a specified period of time. It includes bedload as well as suspended load. Usually expressed as load per unit of time......
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1847
Capillary yield
The quantity of capillary water in mm per day or in litres/sec/hectare, rising through a plane parallel to the phreatic surface, situated at a certain depth below the ground surface......
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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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2598
Factor of safety
An index of stability of a structure with respect to its sudden failure.
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3218
Normal safety freeboard, or Standard freeboard
The difference between the maximum level of normal operation and the maximum level of emergency operation.
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3278
Colloidal yield
Per cent of sample remaining in suspension after 18 hours, when a sample of soil or earth is suspended in water.
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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)......
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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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4288
Specific vertical yield
The volume of flow of water into the well upward through the formation in the bottom of the well per unit sectional area of the well under a unit infiltration head......
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4854
Maximum safety pressure difference of a filter
Permissible pressure difference between the inlet and the outlet of a filter for operator safety reasons .
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5277
Specific yield, or Drainable porosity
1- The volume of water released from a known volume of saturated soil under the force of gravity and the inherent soil tensions. It is expressed as a percentage of the total volume of saturated soil. 2 - See 915......
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5383
Outflow yield
The measure of flow from a drainage system.
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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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5619
Yield (of concrete)
The volume of concrete resulting from a mix of stated quantities of cement, water and aggregates.
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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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