A retaining wall has a vertical back and is $7\mathrm{.}32$ m high.

The soil is sandy clay of $r=17\mathrm{.}3k\frac{N}{m^3}\frac{,}{{?}_C}=12k\frac{N}{m^2}$

$=20.$ Ne glect wall friction. Determine the thest on wall

if drains are blocked unbl' water level reaches $2\mathrm{.}75$ m

from wall's bottom. The backfill is hosizental en top.