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The size of the faeces drop hole in the floor or slab should not be larger than ____________

(a) 5m

(b) 25 cm

(c) 45 cm

(d) 250 mm

I had been asked this question in homework.

My question is from Design of Septic Tanks in chapter Road Estimating, Sanitary and Water Supply Work of Civil Engineering Drawing

1 Answer

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Best answer
Right answer is (b) 25 cm

To explain: The user positions themself over the small drop hole during use. The size of the feces drop hole in the floor or slab should not be larger than 25 centimeters (9.8 inches) to prevent children falling in. Light should be prevented from entering the pit to reduce access by flies. This requires the use of a lid to cover the hole in the floor when not in use. However, in practice, such a lid is not commonly used as it is easy to lose it or for the lid to get very filthy.

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