The figure below shows a concrete dam with a sheet pile. The water content of the soil under the dam is w = (18+) %. (a) Draw the flow net. (5 Marks) (b) Estimate the pore water pressure and the hydraulic gradient at points A and B shown in the figure. (6 Marks) (e) Estimate the effectives stress at point B. (4 Marks) (d) Evaluate the exit gradient and compute the factor of safety with respect to quick condition. Comment on the acceptability of the factor of safety you have calculated. (5 Marks) 6.0m B. Impermeable Rock