$4\mathrm{.}1$ A $9\mathrm{.}5$ m deep $($measured from the ground surface to the bottom of the foundation$)$ twostory basement is located in a normally consolidated clay. The depth of the groundwater level is $H=2\mathrm{.}5m,$ and the unit weights above and below the groundwater level are $=16k\frac{N}{m^3}$ and ${}_{\text{s}\text{a}\text{t}}=20k\frac{N}{m^3}($saturated unit weight$),$ respectively. The effective strength parameters are $c^{\text{'}}=0$ and ${}^{\text{'}}=32.$ The undrained shear strength is $s_u=55k\frac{N}{m^2}.$ Compute the total lateral force per unit length of the basement wall and the location of the resultant.

$4\mathrm{.}2$ Similar to problem $4\mathrm{.}1.$ The depth of the foundation is $9\mathrm{.}5$ m $,$ and the groundwater level $H=3m.$ The soil is silty sand. Assume the following parameters: $=18k\frac{N}{m^3},{}_{\text{s}\text{a}\text{t}}=22k\frac{N}{m^3}($saturated unit weight$),c^{\text{'}}=0,{}^{\text{'}}=34.$ Compute the total lateral force per unit length of the outer wall of the basement and the location of the resultant.