Fig. 5 Experimentally determined geometric factor, F_g(expt), shown with F_g predicted using the following models: Mualem–Friedman Method 1, F_g(MF1) = (_eff)^(ß+1)/(_s - _r); Mualem–Friedman Method 2, F_g(MF2) = F(m)(_eff)^ß, with ß = 0.5; Marshall's method, F_g(M) = (_eff)^b, with b = 0.5; Millington and Quirk's method, F_g(MQ) = (_eff)^c/(_s - _r)², with c = 10/3; and Penman's method, F_g(P) = 0.66

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