Identify the parameters used in the Hazen & William's nomogram

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Identify the parameters used in the Hazen & William's nomogram to calculate pipe diameter for water supply:
P. Flow rate in lit/sec
Q. Pipe diameter in mm
R. Population to be served
S. Head loss in m/m
T. Velocity in m/sec

1. P, Q, S
2. R, S, T
3. P, R, S
4. P, S, T

Correct Option: A

P, Q, S

D =		3.59Q		^0.38
		C_hS^0.54