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# Design Procedure for a Water Tank……….

Step One:

Determine the design constants such as σcbc, σct, m, σst

Where,

σcbc = permissible compressive stress in concrete

σct = permissible tensile stress in concrete

m = modular ratio

σst = permissible compressive stress in steel

Step two:

Determine:-

1. Dimensions of the tank
2. Volume of the tank
3. Area of the tank (by assuming its depth)

#### Step three:

Find:-

• Hoop tension, Ht=d x h x D/2
• Area of Steel, Ast= d x h x D/2 σst

#### Step four:

Thickness of the wall of water tank

Ht= [1000t + (m – 1) Ast] x σct

#### Step five:

Reduction in hoop steel. The steel calculated in step 3 is for 1m height from the bottom of the water tank. The pressure of water decreases at the top. Hence, steel can be reduced by keeping the same thickness of wall.

#### Step six:

Distribution steel (vertically placed)

Ast= 0.3% of Ag

#### Step seven:

Floor of the tank

Provide 0.3% of Ag both ways