The circular tank is considered as the easiest form of the water tank. The lesser amount of material is needed for maintaining a similar amount of storage. Besides, due to its circular shape, it does not contain any corner and it can be water-resistant. It is very cost-effective for lesser storage of water up to 20000000 litres and with the diameter in the range of 5 to 8 m. The intensity of the storage is among 3 to 4 m. The side walls are built up for hoop tension and bending moments.