Fig. 4. Temporal changes in the cumulative infiltration for several supply water pressures: (a) for the 0.4-mm glass beads (a very slow increase is followed by a rapid increase at supply water pressures less than –2.3 cm) and (b) for the 0.30- to 0.60-mm (30–50 mesh) sea sand (a nearly linear increase in the cumulative infiltration with time).