Water Supply Engineering
When the reduced level of the water source is higher than the reduced level of the consumer's place, water is generally supplied

All listed here
Both (A) and (B)
By gravitational system
By pumping system

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Water Supply Engineering
Time of concentration

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

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