$14\mathrm{.}3$ Use Eq$.(14\mathrm{.}1),$ Figure $14\mathrm{.}5$a$,$ and the following values to determine the at$-$rest lateral earth force per unit length of the wall: $H=10ft,H_1=4ft,H_2=6ft,=105l\frac{b}{f}{t}^3,{}_{\text{s}\text{a}\text{t}}=122l\frac{b}{f}{t}^3,{}^{\text{'}}=30,c^{\text{'}}=0,$ and $q=300l\frac{b}{f}{t}^2.$ Fid the location of the resultant force.

$K_o=1-sin{}^{\text{'}}$

Figure $14\mathrm{.}5$ At$-$rest earth pressure with water table located at a depth $z$