Fig. 6 Experimentally determined geometric factor, F_g(expt), shown with F_g estimated using optimized values of powers of _eff in the following models: Mualem–Friedman Method 1, F_g(MF1) = (_eff)^(ß+1)/(_s - _r); with ß + 1 = 1.356; Mualem–Friedman Method 2, F_g(MF2) = F(m)(_eff)^ß with ß = 0.068; and Marshall's method, F_g(M) = (_eff)^b with b = 0.58

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