The fraction of a saturated bulk volume consisting of water which will drain by gravity when the water table drops; specific yield is less than porosity because some water is too strongly absorbed to the earth material to drain. The ability of an unconfined or water-table aquifer to store water is measured by its specific yield. Specific yield can be several orders of magnitude larger than the storage coefficient, thus producing more water when developed.
The ratio of the volume of water that will drain from a unit volume of aquifer by gravity flow.
Specific Yield - A ratio of the volume of water that a unit volume of subsurface material will yield by gravity, divided by that unit volume; a measurement associated with unconfined aquifers.
The ratio of the volume of water a rock or soil will yield by gravity drainage to the total volume of the rock or soil.
the ratio of the volume of water which will drain from a porous medium by gravity to the volume of the porous medium.
Ratio of the volume of water that drains from a saturated medium due to gravity to the total volume of the medium.
The quanity of water that a unit volume of saturated permeable rock or siol will yield may be expressed as a ratio or as a percentage by volume
(Applies to unconfined aquifers.) The volume of water released from storage from a unit area of the aquifer per unit decline of the hydraulic head.
