**Dear Readers ,**

**During the previous article , we saw ” How to find the size of Water Tank ” **

**[ Refer the articles : Article 01 , Article 02 , Article 03 ]**

**We are quite happy to inform you that an Architect from Ajmer**

** has sent the following calculations.**

**[ On her own request , we are not publishing her name here ]**

## Case Study 01 – A Bungalow. For Over head water tank.

**Total Number of Residents – 4**

**Plot Size – Not required for calculations.**

**Step -01: DETAILS**

**No of Units to be served by this water tank (U) , U = 1****Average members per unit (m) , m = 4****Average water consumption per person per day , W= 135 Liters / day****Water storage to be made for how many days (n) , n = 2****Buffer supply to be maintained in the tank (x%) , x% = 5%****Free board to be kept = 250 to 300mm , let’s assume : 300 mm**

**Step – 02: Find out the capacity of water tank;**

**C = n x w x m x U (litre)**

**C = 2 x 135 x 4 x 1 **

**C = 1080 Lt.**

**Step – 03: Add for the Buffer storage in the tank @ 5%**

**C1 = 1.05(n x w x m x U)**

**=1.05 x 1080 litre = 1134 litres**

**C2 = 1.05 (n x w x m x U) litres /1000**

**= 1134/1000 = 1.134 Cu.M**

**Step -04: Find out the height of the water in the tank **

**h = water capacity in CuM/ area of the water tank (a x b)**

**Area of water tank is assumed as ( 1m x 1.5 m ) = 1.5 Sq.m **

**= 1.134 / 1.5 = 0.75 m**

**Step -05 Find out the height of the water tank:**

**H = h + free board**

**= 0.75 + 0.300 = 1.05 m**

**Step -06 Basic Internal size of the water tank:**

**Size : 1m x 1.5m x 1.05 m**

**Step -07 To find the out size of the water tank :**

**RCC wall thickness = 100mm**

**RCC slab base thickness = 100mm**

**RCC top slab = 100mm**

**a = 1+ 0.10+0.10 = 1.20m**

**b= 1.5+0.10+0.10 = 1.70m**

**H = 1.05 +0.1+0.10 = 1.25m**

**Overall size of the water tank : 1.2 m x 1.70m x 1.25m**