For the survival of fish in a river stream, the minimum dissolved oxygen is prescribed
A. 3 ppm
B. 4 ppm
C. 5 ppm
D. 10 ppm
Answer: Option B
This Question Belongs to Civil Engineering >> Waste Water Engineering
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The effluent of a septic tank is
A. Fit for discharge into any open drain
B. Foul and contains dissolved and suspended solids
C. As good as that from a complete treatment
D. None of these
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B. 1 in 10
C. 1 in 15
D. 1 in 20
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B. Without manhole covers
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