Correct option is B
According to
IS 3370 (Part 2): 2009 (Code of Practice for Concrete Structures for the Storage of Liquids), the
minimum clear cover provided in the design of water tanks is
45 mm. This cover ensures:
1. Protection against corrosion: Water tanks are exposed to constant moisture and sometimes aggressive chemicals, so a larger cover is necessary.
2. Durability: The thicker cover improves the service life of the structure.
3. Crack prevention: Proper cover reduces the chances of cracks and leakage in liquid-retaining structures.
