A gravity dam with a trapezoidal section, as shown in the figure. A distance of $15$ m from the toe, a drain is located, which point has a pressure due to uplift of zero and increasing uniformly to full hydrostatic at the heel. Upstream face $1$H:$5$V$,$ while downstream face is inclined $1$H:$2$V$.$ Determine the maximum foundation pressureUse unit weight of concrete $=23\mathrm{.}54$kN $/$ cu$.$m Use unit weight of water $=9\mathrm{.}81$kN $/$ cu $.$mUse coefficient of friction $=0\mathrm{.}5$