Civil Engineering MCQAE Level Civil Engineering
The liquid capacity of a septic tank (in litres) for a household of N persons as per IS 2470 is:
Environmental EngineeringSeptic Tank DesignMEDIUM
Choose the correct answer
A
C = 150 N
B
C = 150 N + 2000 (for N > 30)
C
C = 300 N
D
C = 1000 N
Correct Answer
A. C = 150 N
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IS 2470: septic tank liquid capacity = 150 N litres + 2000 litres clearance volume (for > 30 persons) OR 1000 litres minimum. Detention time = 1-3 days. Length:Width = 2:1 to 4:1. Sludge desludging every 1-3 years. Effluent requires soil absorption (soak pit or trenches).
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