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The outlet pipe in the septic tank is kept about _________ lower than the inlet pipe.

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in Construction & Building Materials by (189k points)
The outlet pipe in the septic tank is kept about _________ lower than the inlet pipe.

(a) 5 cm

(b) 10 cm

(c) 15 cm

(d) 30 cm

The question was asked at a job interview.

I want to ask this question from Systems of Plumbing in chapter Plumbing for Buildings of Construction & Building Materials

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The correct choice is (c) 15 cm

For explanation I would say: A septic tank is used for the treatment of sewage from an isolated group of country houses where a public sewer is not available. The outlet pipe in the septic tank is kept about 15 cm lower than the inlet pipe.

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