Groundwater Flow Equation
The governing partial differential equation for a confined aquifer used in MODFLOW is:
where
- , and are the values of hydraulic conductivity along the x, y, and z coordinate axes (L/T)
- is the potentiometric head (L)
- is a volumetric flux per unit volume representing sources and/or sinks of water, where negative values are extractions, and positive values are injections (T−1)
- is the specific storage of the porous material (L−1); and
- is time (T)
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