$17\mathrm{.}6$ Figure $17\mathrm{.}2$ shows a foundation of $3\mathrm{.}05m1\mathrm{.}91m$ resting on a sand deposit. The net load per unit area at the level of the foundation, $q_o,$ is $144k\frac{N}{m^2}.$ For the sand, ${}_s=0\mathrm{.}3,E_s=22,080k\frac{N}{m^2},D_f=0\mathrm{.}76m$ and $H=9\mathrm{.}76m.$ Assume that the foundation is rigid, and determine the elastic settlement the foundation would undergo. Use Eas. $(17\mathrm{.}2)$ and $(17\mathrm{.}10)$