$17\mathrm{.}18$ Using the information from Problem $17\mathrm{.}17$ and a groundwater table at Level B$,$ recompute the lateral earth pressures and compute the hydrostatic pressures acting on the back of the wall. Present your results in the form of a pressure diagram, and then compute the total normal force acting on the wall and the bending moment at the bottom of the stem. Com. pare the results with those obtained in Problem $17\mathrm{.}17.$

$17\mathrm{.}19$ Repeat Problem $17\mathrm{.}17$ using Coulomb's method.

$17\mathrm{.}20$ Repeat Problem $17\mathrm{.}18$ using Coulomb's method. Compare the results with those obtained in Problems $17\mathrm{.}17,17\mathrm{.}18,$ and $17\mathrm{.}19.$

rivune $17\mathrm{.}18$ Proposed retaining wall for

Problems $17\mathrm{.}17$ through $17\mathrm{.}20.$