**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 ([L^{3}·T^{−1}]; m^{3}/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 ([L^{2}]; m^{2})

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. ISBN 0-13-365312-9