#### RCC Circular Water Tanks

Circular water tanks have the properties of the cylinder. Cylinder stress is exerted on the circular water tank. It is distributed with rotational symmetry. The stress distribution remains unchanged if the object is rotated about a fixed axis.

**There are three different patterns of cylinder stress namely;**

- Hoop stress or circumferential stress – it is in tangential direction
- Axial stress – parallel to the axis of the cylinder
- Radial stress – It is perpendicular to the symmetry axis but is coplanar

#### Some important theory for Circular Water Tanks

The base of the circular water tank has a flexible joint. The tank rests on the ground. The wall of the tank is designed for hoop tension.

**Formula for Hoop tension (Ht)**

The formula for calculating hoop tension is,

Ht = PD/2 ———————————— equation 1

Where,

P = water pressure on wall

D = diameter of tank in metres

The formula for pressure is given by,

P = d x h —————————————equation 2

Where,

d = density of water = 10kN/m^{3}

h = depth of water in metres