A sheet pile wall has been installed partially through a silty sand layer. Assume the sheet pile is 12m long and penetrates 6m into the silty sand layer of thickness 12m. For this condition a) Draw the flow net using 3 (max 4) flow channels. The flow net should be completely symmetrical about the bottom of the sheet pile b) If the water height on the upstream side is 5m and on the downstream side 1m, compute the amount of water flowing under the sheet pile per meter of wall if the coefficient of permeability is 3.1x10-4 cm/sec. c) Compute the maximum hydraulic gradient at the downstream side of the sheet pile