In India, the design of water supply systems has been done using certain standards. Currently the standard being used is BIS 1172: 1993, reaffirmed in 1998. This specifies a consideration of use of the following:
For communities with a population of between 20,000 to 100,000 — 100 to 150 litres per head per day
For communities with a population of over 100,000 — 150 to 200 litres per head per day.
In its previous avatar there was also an attempt made in IS 1172 to understand the break-up of this demand which was then put as 135 litres per person per day. The break-up was as follows:
Bathing: 55 litres
Toilet flushing: 30 litres
Washing of clothes: 20 litres
Washing the house: 10 litres
Washing utensils: 10 litres
Cooking: 5 litres
Drinking: 5 litres.
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