Septic tank is usually consists of brick wall in cement not less than _______
(a) 20 cm
(b) 100 cm
(c) 80 cm
(d) 200 cm
This question was addressed to me by my college professor while I was bunking the class.
The doubt is from Design of Septic Tanks topic in division Road Estimating, Sanitary and Water Supply Work of Civil Engineering Drawing