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normal pressure

1. n. [Geology]

The pore pressure of rocks that is considered normal in areas in which the change in pressure per unit of depth is equivalent to hydrostatic pressure. The normal hydrostatic pressure gradient for freshwater is 0.433 pounds per square inch per foot (psi/ft), or 9.792 kilopascals per meter (kPa/m), and 0.465 psi/ft for water with 100,000 ppm total dissolved solids (a typical Gulf Coast water), or 10.516 kPa/m.

See: abnormal pressureformation pressuregeostatic pressurehydraulic headhydrostatic pressurelithostatic pressureporepore pressurepressure gradientunderpressurevirgin pressure

Pressure versus depth plot
Pressure versus depth plot.

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