Simulating the Evolution of Fluid Underpressures in the Great Plains, by Incorporation of Tectonic Uplift and Tilting, with a Groundwater Flow Model

Figure 1

The definition of underpressure. , depth of measuring point; WT, elevation of water table; GL, elevation of ground level; Up_real, actual underpressure as head drop; Up_approx, head drop from land surface; , pressure; γ, unit weight of water; , elevation of formation.