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Question
The demand of water is 150 litres/head/day in a city of one lakh population. The factor of safety is taken as 1.5, detention time as 4 h and overflow rate as 20,000 litres/day/m2. The area of 3m deep plain sedimentation tank as per surface loading consideration will be
A.
1025m2
B.
1075m2
C.
1125m2
D.
1175m2
Answer ( Option C)

1125m2

Solution

Given,
Water demand = 150 litres/head/day
Population = 1 lakh
Factor of safety = 1.5
Detention time = 4 hrs
Overflow rate = 20,000 litres/day/m2
Depth of tank = 3 m
Water flow = 150 × 105 × 1.5
= 22.5 MLD

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