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→Hydraulic head
===Hydraulic head===
===Hydraulic head===
[[file:formation-fluid-pressure-and-its-application_fig5-35.png|300px|thumb|{{figure number|1}}Relationship of the variables Hw and Z used in the hydraulic head equation. From Hubbert, 1953; courtesy AAPG.]]
[[file:formation-fluid-pressure-and-its-application_fig5-35.png|300px|thumb|{{figure number|1}}Relationship of the variables Hw and Z used in the hydraulic head equation. From Hubbert;<ref name=ch05r11 /> courtesy AAPG.]]
Hydraulic head (H<sub>w</sub>) is the height or elevation above a given subsurface point at which a column connected to a body of water will equilibrate. It reflects the level of the potential energy possessed by the water.<ref name=ch05r5>Dahlberg, E., C., 1994, Applied Hydrodynamics in Petroleum Exploration, 2nd ed.: New York, Springer-Verlag, 295 p. Excellent subsurface fluid pressure reference. Covers hydrodynamic and static fluids.</ref>
Hydraulic head (H<sub>w</sub>) is the height or elevation above a given subsurface point at which a column connected to a body of water will equilibrate. It reflects the level of the potential energy possessed by the water.<ref name=ch05r5>Dahlberg, E., C., 1994, Applied Hydrodynamics in Petroleum Exploration, 2nd ed.: New York, Springer-Verlag, 295 p. Excellent subsurface fluid pressure reference. Covers hydrodynamic and static fluids.</ref>