Question

What is the detention period in a septic tank?

(a) 24 hours

(b) 12 hours

(c) 06 hours

(d) 36 hours

I got this question by my college director while I was bunking the class.

Question is taken from Schedule of Rates for Water Supply works topic in section Schedule of Rates Metric and F.B of Civil Engineering Drawing

Answer 1

The correct choice is (a) 24 hours

The explanation is: Detention period of 24hrs (mostly) considered in septic tank design. The rate of flow of effluent must be equal to the rate of flow of influent.