Calculation of size and Capacity of Rectangular water tank?

For high rise buildings, we will receive approved drawings from the office regarding to water tank dimensions. But if you need to estimate a water tank for a small residential Building this article is very important for you to read.
The Calculation is divided into two parts:

How to calculate volume of water requirements.

We know that as according per IS code, 135 liters of water needed for one person per daily use.Now let,s break up the Is assumption
According to following points

1: For cooking 5 liters.

2: For drinking 5 liters.

3: For bathing and toilet 85 liters.

4: For cleaning of housing 10 liters.

5: For kitchen and washing clothes 30 liters.

Estimation of Tank size and Capacity:

For a typically 4 members containing family
For 4 members containing family, The total water requirement is  135 liters  multiply by 4 which is equal to 540 liters (135 x 4 = 540)
We all know that (1m3=1000 liters)
But we also know that
1 liter is equal to 0.001 m3 (1 liter= 0.001 m3)
But we need 540 liters water for our house so
Since 540 litres is equal to 0.54 m3  as (540 x 0.001 = 0.54 m3)
Let’s we suppose the depth of water tank is 0.6 m.

The Area of tank becomes 0.54 /0.6 which is equal to 0.9 m2 (0.54/0.6= 0.92 m2)
L multiply B= 0.9 m2
We can put the value on the above given formula If we know one of the above given dimensions .
Note:we can also consider the length as 2 times of breadth
(L =2B)
But 2 times of breadth multiply by one time of breadth is equal to 0.9m2
(2B , B=0.9m2)
So B2 is equal to 0.45
(B2= 0.45)
But also B is equal to 0.67 (B=0.67)
So there fore Length is equal to 2 multiply by 0.67 which is equal to 1.34m (2 x 0.67= 1.34 m)
The water tank size of 540 liters will be.

Length will be equal to 1.34 m  ( L=1.34 m )

And Depth is equal to 0.6 ( D =0.6m )

Breadth is equal to 0.67 m ( B=0.67m )

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