Question

Water distribution mains are design for hourly demand.. Because water should be distributed to consumer for an few hours in a day, if we design for daily demand then it is uneconomical.

Part 2

Reservior is built for the emergency storage of water if demand is less then excess of water store in that but if demand is more the required demand the surplus water supplied by reservior to meet the demand.. In case fire breaks in the city then max water is required which is supplied by reservior

So it is design for all of the above

Part 3

Given

Population = 20000

No. Of people in each property : 4

No. Of property :20000/4 = 5000

Water required for each property : 0.87L/day

Total average water demand : 0.87*5000 =4350 l/day

Water pump design for horly demand

Design discharge = 2.2*4350 = 9570l/day

Part 4

Design discharge = max daily demand + fire demand

Fire demand = 76380L/min for 5 hour means

76380*5*60/(24*3600) = 265.2L/s = 0.265m^3/s

Fire demand = . 265+ 1.62 = 1.88m3/s

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