Water Supply Engineering
In centrifugal pump installation,

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

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Water Supply Engineering
Time of concentration

time taken for the storm water to travel from the most remote point to the drain.
is the time taken, for precipitation
time taken for all the ran off to reach the drain
duration of rainfall.

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