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→Potential energy of fluids
:<math>\Phi = \mbox{gH}_{\rm w} = \mbox{gZ} + \frac{\mbox{P}}{\rho}</math>
:<math>\Phi = \mbox{gH}_{\rm w} = \mbox{gZ} + \frac{\mbox{P}}{\rho}</math>
According to Dahlberg<ref name=ch05r5 />), hydraulic head serves as a practical approximation of fluid potential, since the only difference is the coefficient of gravity (g), which is fairly constant.
According to Dahlberg<ref name=ch05r5 />, hydraulic head serves as a practical approximation of fluid potential, since the only difference is the coefficient of gravity (g), which is fairly constant.
===Potentiometric surface===
===Potentiometric surface===