Minimum Clear Cover Required For The Design Of Water Tank

The minimum clear cover required for the design of a water tank in severe exposure conditions is 45 mm.

Solution

As per IS 3370, the nominal/clear cover provided to a water tank depends on the exposure conditions. To prevent the reinforcement from corrosion, a layer of concrete should be there in reinforced concrete structures. 

Exposure Conditions	Minimum concrete grade	Nominal cover
Mild	M20	20 mm
Moderate	M25	30 mm
Severe	M30	45 mm
Very severe	M35	50 mm

Hence, the minimum clear cover required for the design of a water tank in severe exposure conditions is 45 mm.

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