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

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

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Water Supply Engineering
Time of concentration

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

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