A water main 8 in. in diameter, C = 100, and 800 ft in length is laid 40 ft uphill to re...

A water main 8 in. in diameter, C = 100, and 800 ft in length is laid 40 ft uphill to residential apartments. When the discharge is 750 gpm as required for fire protection, the minimum pressure at the end fire hydrant must be 20 psi. Calculate the pressure at the inlet of the main to satisfy these conditions. Calculate h_L, by Eq. 4-7 and check using Figure 4-6.