Minimum Clear Cover Required For The Design Of Water Tank

By Aina Parasher|Updated : July 19th, 2022

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

  1. 50 mm
  2. 25 mm
  3. 45 mm
  4. 30 mm

Answer: C. 45 mm

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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