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Determination of Pore Pressure with Seepage Figure 10.19 shows the section of a homogeneous dam with an arbitrarily chosen trial arc. There is steady seepage flow through the dam as represented by flow and equipotential lines. From the equipotential lines the pore pressure may be obtained at any point on the section. For example at point a in Fig. 10.19 the pressure head is h. Point c is determined by setting the radial distance ac

Figure 10.18 Tension crack in dams built of cohesive soils

Figure 10.19 Determination of pore pressure with steady seepage

equal to h. A number of points obtained in the same manner as c give the curved line through c which is a pore pressure head diagram.