A trapezoidal concrete dam is 20m high. The upstream face is vertical and the water is flush with the top, which is 3m wider. The coefficient of friction between the base of the dam and foundation is 0.60. If it is required to have a factor of safety of 3 for overturning and knowing that specific gravity of concrete is 2.40.
Find the required width of the base.
Find the factor of safety against sliding.
Find the pressure at the heel.
Find the pressure at the toe.