(b) For a circular culvert with diameter, D, flowing full with both headwater and tailwater submerged, develop the general expression (SI units) for the energy loss of water flowing through the culvert depicted as H in the figure below. Use the Manning formulation for barrel friction and assume entrance and exit losses are not negligible. Velocity of approach and tailwater velocity are negligible. HW/D >1. Your expression for H must be in the most simplified form possible for the stated conditions. State all assumptions. Show all work. You may find following expression useful: Manning Q = (1/n)ARh2/3S1/2 HW WATER SURFACE W.S. 181818M [10 Marks] [15 MARKS]