specific yield

specific yield

[spə′sif·ik ′yēld]
(hydrology)
The quantity of water which a unit volume of aquifer, after being saturated, will yield by gravity; it is expressed either as a ratio or as a percentage of the volume of the aquifer; specific yield is a measure of the water available to wells.

specific yield

The percentage of water which will be yielded by a rock or soil (by gravity) after being saturated; computed in terms of the ratio of the volume of water retained to its own volume.
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References in periodicals archive ?
Mackay Potash hosts a specific yield mineral resource of 26.1 million tonnes of SOP to a depth of 30 metres, comprising 10 million tonnes classified as indicated and 16.1 million tonnes classified as inferred.
The three criteria for identifying the importance of a specific yield component in affecting grain yield were based on Board et al.
The process of anaerobic co-digestion is the digestion of two or more substrates that are complementary, thus accelerating the degradation of organic matter and;consequently, the yield of biogas and methane, generating higher specific yield and organic fertilizer with better quality.
where x' and h' are two directions of local coordinates, as shown in Figure 1; H is the aquifer thickness; t is time; K is the permeability coefficient; and [mu] is the specific yield, which is defined as the amount of water released as a result of gravity in a unit volume of saturated rock or soil and can be expressed as the ratio between the water volume released by the gravity and the rock or soil volume in saturated conditions.
The specific yield growth improvement targets will vary by crops and countries and will also depend on the overall trajectories of food demand and on how much more land should be utilized for agriculture, or to what extend cropping intensity on existing land can be increased.
In upper part of Doab the porosity of aquifer ranges from 35 to 45 percent with specific yield of 14%.
The present investigation are aimed at prescription based fertilizer applications on soil test basis for specific yield targets of ragi to recommended to the farmers for judicious use of fertilizers for sustainable crop production.
The effective change in watertable depth is multiplied with the gross command area and specific yield of the soil [10].
where R(tj) (cm) is recharge occurring between times t0 and tj Sy is specific yield (dimensionless) and H(tj) is the peak water level rise attributed to the recharge period (cm).
where [g.sub.g] is the specific yield of pyrolysis gas, kg/kg of dry oil shale; [g.sub.v] is the specific consumption of feed air, kg/kg of dry oil shale; [t.sub.p] is the process temperature, [degrees]C;
Fed officials said the purchase of Treasuries isn't designed to target any specific yield levels.
For example, when creating a yield map, we can assign a color to each yield point based on the specific yield value (red for low yields, yellow for medium yields, and green for high yields is a logical color assignment).

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