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Fig. 5. Comparison of the values of ${phi}$ - ${theta}$ _w and ${theta}$ _t (deduced from ${theta}$ _d) with ${alpha}$ _c as predicted from Eq. [3] for the moisture content at which solute diffusion vanishes, and inferred to be the critical volume fraction for percolation. In this comparison the calculated value of A/V from the particle size distribution was used as described in Hunt and Gee (2002b), but the unknown proportionality constant was uniformly taken to be 1/6 to facilitate comparison.