The face of a dam is vertical to a depth of 17m below the water surface from slopes at $60^{\large\circ}$ to the vertical.If the depth of water is 7.5m.What is the $F_{resultant}$ on the whole face?

Question

$\begin{array}{1 1}(A)\;1561KN\\(B)\;1563.29KN\\(C)\;1326.3KN\\(D)\;1389KN\end{array} $