# Design Procedure for Circular Water tank

#### In our previous article, we discussed some important theory and formulas required in the design procedure of Circular Water Tank.

We will now move on with the stepwise design procedure for Water tank design.

#### 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:

1. Hoop tension, Ht = d x h x D/2

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

We will also do some good examples for the circular water tank in our succeeding articles.

### 11 thoughts on “Design Procedure for Circular Water tank”

1. Sir,
Why all of the water tanks are circular/cylindrical in shape even if it is challenging to design as compare to rectangular section.

2. R/sir
thanks for your detailed design information given.we are in process for designing of 10000 cubic meter capacity underground water storage tank. approximate 1 mtr below ground. kindly give economical suggestions regarding (1) dia of container (2) minimum no of compartments (3) sludge drain outlets (4) water depth

with kind regards

dnyanesh b.aware

3. Thanks for the easy steps for design of ring beam. But if you have a ring beam 100m dia and 15m depth. Do we need to consider the cantilever action with Hoop tension?
If required than how do we optimise the force distribution for hoop tension and cantilever moment?

4. please attache to me circular reservoir design steps

5. Sir,

Thanks

6. M much helped by this design steps ..4 my xam..
Thank u

7. Dear sir
We are currently operating few civil projects in and bangalore, karnataka state, India.
Your simple details of structural design gives us more hope in executing our projects.
Thanking you
With kind regards
B.vijayakumar

8. Dear Sirs,

Thank you for your information about ” How to design Circular Tank”. f ct(permissible tension in concrete), this value is less than 0.5 fr (modulus of rupture). The result amount of Ast is very little. Is there any minimum amount of Ast for hoop reinforcement ??.