Fig. 5 Calculated and measured values of Ks, where the intercept (B) for Eq. [1] has been calculated using values of 
and hb, and the relationship between B and R/l for the Rawls data set given in Fig. 4
Fig. 5 Calculated and measured values of Ks, where the intercept (B) for Eq. [1] has been calculated using values of and hb, and the relationship between B and R/l for the Rawls data set given in Fig. 4