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  1. A septic tank of 7 m3 in volume serves for 5 people. If the rate of accumulation of sludge is 70 litres per capita per year and sludge is removed when it occupies 50% of its volume, what is the cleaning interval of septic tank ?

  2. A.
    3 years
    B.
    5 years
    C.
    7.5 years
    D.
    10 years

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    Workspace

    Answer : Option D

    Explanation :

    No answer description available for this question. Let us discuss.


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