1) A masonry dam of trapezoidal section with one face vertical, has a thickness of 0.60 m at the top and 3 m at the bottom. It is 6.7 m high and has a horizontal base. The vertical face is subjected to water pressure, the water standing 4.6 m above the base. Where will the resultant pressure intersect the base, and what will be the intensity of pressure at the heel and at the toe assuming there is a hydrostatic uplift which varies uniformly from that due to a full head of 4.6 m at the heel to zero at the toe. Determine also the factor of safety against overturning and against sliding (coefficient of friction 0.45). =