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Estimating and Costing

Q1: The detention period in a septic tank is assumed

A 20 minutes

B 25 minutes

C 30 minutes

D 40 minutes

ANS:C - 30 minutes

A detention period of 24 to 48 hrs. For tanks serving less than 50 persons and a period of 10 to 18 hrs.

For tanks serving more than 50 persons are generally adopted. The septic tank should be constructed in 2 compartments to facilitate the cleaning of one while the other is in use.



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