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Water Savings: Calculation Tool?

I am trying to build a simple water use calcuation tool that could help a person calculate the water saved by installing water saving taps, cisterns, rainwater harvesting, grey water recycling etc. In this context, are there any statistics or audits on urban  water consumption patterns based on income levels and types of buildings in India?

For example:

1. flow rates of taps and their average running time per person per day in kitchens, bathrooms, gardens, commercial establishments, offices etc. 

2. Flow rates of showers and usage patterns

3. Types of WC cisterns and their usage patterns.

Thank you





Dear Swati,

A Water savings Calculation tool is a really great Idea and I would like to help in any way I can.

1.There appears to be no standards/specifications of any kind laid down by any Govt. agency such as Bureau of Indian Standards (BIS) for sanitary fittings like taps, shower heads etc. In the absence of such info the only thing to do would be to approach individual, large manufacturers to ask for flow rates, efficiencies etc.

2.Flush tanks for WCs have seen a lot of change with tank capacities coming down to 3 or 4 litres per flushing and some with a facility to flush with a part of the total tank capacity. Here again, it is necessary to ask manufacturers for information on usage patterns, efficiencies, etc.

I am sorry I can not furnish any more information at this stage, but I will mail any information that I manage to collect on this subject as and when I find something relevant.


Ion Exchange, New #1, Upstairs
Akkamma Block, Dinnur Main Road
R.T. Nagar


Dear Swati,

The US EPA has a lot of this information at but it may not be relevant to Indian conditions.

Please refer this link:

Hope this helps.

Anita Bhatt
WES-Net India


Dear Swati,

Please refer the Flow rates table. Click here

Taral Kumar

Executive Director

Akar Impex Pvt. Ltd.


Dear Swati,

In India we have standards on minimum water required for drinking & domestic activities per person. The water use pattern is very diversified, cannot be generalized.

However, standards are also set at global level on optimum or efficient utilization of water by various activities like bathing by using mug & tub is more efficient than bathing by shower; car cleaning by running pipe is water extensive practice than car cleaning by using tub etc. The flow rates in the pipes & shower are dependent on the pressure which varies time to time and place to place.

By adopting water efficient or best practices a substantial amount of water can be saved and to calculate this quantity a comprehensive water audit & accounting study needs to be carried out at organization level, equipment level or system level, state level and can also be done at national level.

We have done about 25 industrial water audits and we developed a water saving calculator for one of our client, brewery located in Bangalore after conducting a detailed water audit at site.

Developing a water calculator for a unit or a household is easy but to develop water saving calculator for all would require a lot of reliable data and analysis.


Karishma Bist
Assistant Director
FICCI – Resource Conservation & Management
Federation House, Tansen Marg, New Delhi-110001

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