In the California Resistance value method, the ratio of an individual thickness of each layer is converted in terms of gravel equivalent (cohesiometer values) by the relationship
1
\(\frac{{{t_1}}}{{{t_2}}} = {\left( {\frac{{{C_2}}}{{{C_1}}}} \right)^{\frac{1}{5}}}\)
2
\(\frac{{{t_1}}}{{{t_2}}} = {\left( {\frac{{{C_2}}}{{{C_1}}}} \right)^{\frac{1}{3}}}\)
3
\(\frac{{{t_1}}}{{{t_2}}} = {\left( {\frac{{{C_1}}}{{{C_2}}}} \right)^{\frac{1}{3}}}\)
4
\(\frac{{{t_1}}}{{{t_2}}} = {\left( {\frac{{{C_1}}}{{{C_2}}}} \right)^{\frac{1}{5}}}\)