An alternative term to capacity that is associated with acceptance testing of ground water wells. Specific capacity is reported as the rate at which water is discharged from a well per unit drawdown in the aquifer in which the well is completed. This is usually expressed in gallons per minute per foot (of drawdown) [gpm/ft] or cubic meters per day per meter (of drawdown) [m3/d/m]. The latter term may appear in the technical literature as m2/d.

A measure of pumping rate per unit drawdown. If you know a wells specific capacity, you can estimate drawdown at different pumping rates. For example, the specific capacity of a well that delivers 20 gpm with 40 ft of drawdown would be 0.5 gpm/ft. At 30 gpm the drawdown would be 30/.5 = 60 ft.

the yield of a well per unit of draw down.

A well measurement expressed in gallons per minute per foot determined by dividing the yield by the drawdown.

The rate of discharge of water from the well divided by the drawdown of the water level within the well.

The rate of discharge of water from the well divided by drawdown of water level within the well. Specific capacity decreases with duration of pumping.

In ground water hydrology, the yield of a well in gallons per minute per foot of drawdown after a period of sustained pumping.

Expresses the productivity of a well. Specific capacity is obtained by dividing the well discharge rate by the well drawdown while pumping.

A measure of the number of gallons per minute pumped per foot of drawdown in a well at any point in time. Knowing the specific capacity of a well, the operator can estimate the drawdown that will be produced at different pumping rates. For example, the specific capacity of a well that delivers 20 gpm with 40 ft of drawdown would be 0.5 gpm/ft. At 30 gpm the drawdown would be 30/.5 = 60 ft.

an expression of the productivity of a well, obtained by dividing the rate of discharge of water from the well by the drawdown of the water level in the well.

The ratio of discharge into a recharge well to the rise of head at equilibrium.