Water Supply Engineering
If the chosen diameter of a pipe, is less than the economical diameter

All listed here
Cost of pumping will be more than saving
Head loss will be high
Cost of pipe will be less

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Water Supply Engineering
Time of concentration

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

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