Identify the correct statement from the following regarding Cast iron sewer.
(a) They have low internal pressure
(b) They are not leakage proof
(c) They cannot withstand heavy external loads
(d) They are preferred in water supply lines
The question was posed to me during an internship interview.
This intriguing question comes from Material for Sewers topic in division Construction of Sewers, Sewer Appurtenances and Sewage Pumping of Environmental Engineering