Groundwater discharge

Groundwater discharge is the volumetric flow rate of groundwater through an aquifer. 

Total groundwater discharge, as reported through a specified area, is similarly expressed as:

where
Q is the total groundwater discharge ([L3·T−1]; m3/s),
K is the hydraulic conductivity of the aquifer ([L·T−1]; m/s),
dh/dl is the hydraulic gradient ([L·L−1]; unitless), and 
A is the area which the groundwater is flowing through ([L2]; m2)

For example, this can be used to determine the flow rate of water flowing along a plane with known geometry.

See also
Groundwater flow equation
Groundwater energy balance
Submarine groundwater discharge
Discharge (hydrology) – for rivers
volumetric flow rate
flux (transport definition)
Darcy's Law

References
 Freeze, R.A. & Cherry, J.A., 1979. Groundwater, Prentice-Hall. 

Category:Hydrology
Category:Aquifers