Determine the hydraulic gradient and pressure, Physics

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A piping system is shown below. Flow is from A to D and minimum pressure to be maintained is 20 psi.

Pipe	Length (ft)	Diameter (in)	Flow rate (gpm)
A-B	20,000	6	120
B-C	10,000	6	160
C-D	30,000	4	120

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.

Determine:

. Hydraulic gradient at A

. Pressure A, B, C, and D

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