TUTORIALS

How to calculate circular water tank capacity?

It is requested to choose an appropriate size for a circular water tank to collect 20000 litres water for a residential property. Take into consideration that tank depth must not be over 2 meters.

Experiment 1: In case depth = 0.5 m in that case diameter =?
Experiment 2: In case depth = 1 m in that case diameter =?
Experiment 3: In case depth = 1.5 m in that case diameter =?
Experiment 4: In case depth = 2 m in that case diameter =?

Tank capacity = 20000 litres of water

Overall tank capacity = 20000/1000 = 20 m3 [as 1 m3 is equal to 1000 litres]

Tank volume = Area of base x tank height or depth

20 m3 = πD2/4 x d

In case depth = 0.5 m

20 m3 = πD2/4 x 0.5 m = 20 m3 = 0.393(D)2

20 m3/0.393 = 0.393(D)2/0.393

50.90 = D2

√50.90 = square root ((D)2)

D = 7 meters

In case depth = 1 m in that case diameter = 5 meters
In case depth = 1.5 m in that case diameter = 4.12 meters
In case depth = 2 m in that case diameter = 3.56 meters

Appropriate depth and height are in Experiment 3

Hence, depth = 1.5 m and diameter = 4.12 meters are preferred for final design

Watch the following video to learn the complete process.

Lecturer: SL Khan

How to calculate circular water tank capacity?