7 step design procedure for RCC Circular Water Tank
In our previous article, we discussed some important theory and formulas required in the design procedure of Circular Water Tank.
Refer: Important theory and formula derivation for 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:
 Dimensions of the tank
 Volume of the tank
 Area of the tank (by assuming its depth)
Refer: How to calculate Water Tank Capacity?
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
We will also do some good examples for the circular water tank in our succeeding articles.
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#1 by Maawa Hassan on October 8, 2013  1:34 am
Am glad to recieving new posts from your blog, the design provcedures for designing circular tans helped me so much in group project in which we designed an under groung cistern for rain water harvesting.
could you kindly send me the design procedures for designing a bridge which i want to undertake in my final year project. assuming we have rain fall data, survey information and soil test results.
i ‘ll be grateful
Regards
Maawa
#2 by BenzuJK on October 22, 2013  7:56 am
We are glad our site has been helpful. We will try and work on the design procedure for bridges. Keep visiting.
#3 by Albertus Joewono on October 15, 2013  1:44 am
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 ??.
Thank you for your clarification.