Calculation of C_s for Site Class D and S₁ > 0.2

The conditions given in exception 2 given in Section 11.4.8 is applied to C_s as follows:

C_{s} = {\begin{matrix} \frac{S_{D S}}{\frac{R}{I_{e}}} & T \leq {1.5 T}_{s} \\ 1.5 (\frac{S_{D 1}}{T (\frac{R}{I_{e}})}) & {1.5 T}_{s} < T \leq T_{L} \\ 1.5 (\frac{S_{D 1} T_{L}}{T^{2} (\frac{R}{I_{e}})}) & T > T_{L} \end{matrix}

Calculation of Cs for Site Class D and S1 > 0.2