Water required per person per day (Bath, Toilet, Cooking and others) = 150 litres
Drinking water = 4 litres per person per day
Our simple calculation for an overhead water tank for a small bungalow project assuming the average family size is 5 persons is as follow:
Water required for daily chores per person per day is (150l x 5 persons) = 750 litres
Drinking water required per person per day (4l x 5 persons) = 20 litres
Total quantity of water required = 750+20 = 770 litres
Volume of water (770/1000) = 0.77 cubic metres
Minimum Tank Size - 1,500 litres
Recommended Tank Size - 2,000 litres
*Water required for washing 1 car, small front yard garden and other things per day - 200 litres
Note: You'll require larger volume of tank if don't want to pump water everyday.
This simple calculation will help you determine the size of overhead tank required in a project, the volume of water requirement from your borehole/well/other sources of water per day and everything you need to know about water requirements in a simple residential house.
