The density of population over 40 hectares is 250/hectare. If water supply demand per day is 200 litres and sewage discharge is 80% of water supply, the sewage flow in sewers of separate system, is
A. 0.05552 cumec
B. 0.05554 cumec
C. 0.05556 cumec
D. 0.0556 cumec
Answer: Option C
This Question Belongs to Civil Engineering >> Waste Water Engineering
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Sewage flow in sewer = 3 * (40*250*200*0.8) lpd
= (4800000 * 10^-3)/(24*3600) m³/s
= 0.05556 cumec
3 is multiplied as FOS is to be considered.
FOS = 3
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