we will calculate the volume of a Circular Septic tank. Watch the figure given carefully.
From the figure, it is given that, The diameter of Septic Tank = 1350 mm or we can say, 1.35 meter
∴ The radius of Circular septic tank (r) = 1.35/2 = 0.675 meter
Height of Septic Tank (h) = 1300 mm or we can say 1.3 meter
The volume of Circular septic tank = πr²h = 3.14 x 0.675 x 0.675 x 1.3 = 1.86 cum
The total volume of circular septic tank in liter = 1.86 x 1000 = 1860 litre.
So in this way you can calculate the volume of a circular septic tank.