Water Supply Engineering
For determining the velocity of flow of underground water, the most commonly used non-empirical formula is

Hazen’s formula
Slichter’s formula
Lacy’s formula
Darcy’s formula

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Water Supply Engineering
In centrifugal pump installation,

All listed here
The diameter of the pipe at inlet as well as at outlet, is kept smaller than the delivery pipe
The motor may burn out if it is started with empty delivery pipe and with open gate valve
Pump is properly primed before starting

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