A piping system is shown below. Flow is from A to D and minimum pressure to be maintained is 20 psi.
Flow rate (gpm)
Hazen-Williams roughness coefficient C=140 for all the pipes. The elevations of A, B, C and D are 620, 460, 540, and 360 ft respectively.
. Hydraulic gradient at A
. Pressure A, B, C, and D