Figure $2\mathrm{.}8\mathrm{.}28$ Figure P$2\mathrm{.}8\mathrm{.}28$ depicts the Keswick Gravity Dam in California. Find the magnitude and working point of the hydrostatic pressure on the vertical wall of the upstream water and the inclined wall of the downstream waterproofing. The slope of the given inclined wall is the relative ratio of the length and height of the ground plane. Consider the length of the dam as b $=0\mathrm{.}3$ m$.$