How to estimate water demand and storage without hiding the assumptions. The useful output is not a single number or ranking. The useful output is a transparent record of assumptions, evidence gaps and the next validation step.
Use the tool as a screen. Keep the inputs editable, preserve source dates and move material decisions to the appropriate professional, regulatory or organisational review.
Recommended sequence
- Define the population and process demand in consistent units.
- Separate end-use demand from distribution and operating losses.
- Choose storage days as a scenario input, then test a higher-demand case.
- Validate source reliability, treatment, emergency reserve and regulatory design criteria before engineering use.
What to record before sharing a result
Record the reporting period, source of each material input, the definition used for key terms, the methodology version and the limitations that remain unresolved. A result without this context is easier to misread.
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Responsible-use boundary
The related tool supports screening and preparation. It does not replace legal, engineering, financial, environmental, social, assurance or other specialist work where those disciplines are required.