A square foundation $(BB)$ has to be constructed as shown in Figure $6\mathrm{.}11.$ Assum

that $=16\mathrm{.}5k\frac{N}{m^3},{}_{\text{s}\text{a}\text{t}}=18\mathrm{.}55k\frac{N}{m^3},{}^{\text{'}}=34,D_f=1\mathrm{.}22m,$ and $D_1=0\mathrm{.}61n$

The gross allowable load, $Q_{\text{a}\text{l}\text{l}},$ with FS $=3$ is $667\mathrm{.}2$ kN $.$ Determine the size of th

foundation. Use Eq$.(6\mathrm{.}28).$

FIGURE $6\mathrm{.}11$ A square foundation