Water Use Per Person and Comparable Rates
Per-person water use divides the stated daily total by the number of people served.
About 20 minutes, plus any extended practice
Supplied materials
- Paper and pencil; a calculator is optional.
- Calculation rule: Liters per person per day = daily liters used ÷ people served.
- Fictional case 1: Fictional community uses 2400 liters daily for 40 people. Daily use per person?
- Fictional case 2: Fictional community uses 3600 liters daily for 60 people. Daily use per person?
- Fictional case 3: Fictional community uses 4000 liters daily for 50 people. Daily use per person?
- Fictional case 4: Fictional community uses 5400 liters daily for 90 people. Daily use per person?
- Fictional case 5: Fictional community uses 4200 liters daily for 70 people. Daily use per person?
- Fictional case 6: Fictional community uses 6400 liters daily for 80 people. Daily use per person?
- Fictional case 7: Fictional community uses 7500 liters daily for 100 people. Daily use per person?
- Fictional case 8: Fictional community uses 9000 liters daily for 120 people. Daily use per person?
Learn the idea
Per-person water use divides the stated daily total by the number of people served. Totals alone cannot compare similarly sized needs across communities. Use the same time period and unit. These fictional figures teach normalization; they are not measured water use or instructions for restricting a real household’s needs.
Liters per person per day = daily liters used ÷ people served.
Work from the stated fictional inputs and show each operation. Report the required unit and retain the model’s conditions. A calculated change can describe this exercise accurately without proving a causal policy effect in the real world. Check what has been omitted before applying a numerical model to a decision.
- Read the stated fictional case and identify the required output.
- Liters per person per day = daily liters used ÷ people served.
- Write the values into the rule, calculate and report the required unit.
- Explain one condition the calculation does not establish about actual society.
See the method in action
Fictional community uses 2400 liters daily for 40 people. Daily use per person? Liters per person per day = daily liters used ÷ people served. Substitute the given values: 2400/40 = 60 liters per person per day. I keep the stated units and operation order; changing an operation would answer a different question. This result describes the supplied model; other real-world factors could change an actual outcome.
Check your reasoning
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Helpful tips
- Liters per person per day = daily liters used ÷ people served.
- Keep the stated unit and model conditions. A calculated output does not establish a real-world causal effect.
See the answer and explanation
60 liters per person per day
Liters per person per day = daily liters used ÷ people served. Calculation: 3600/60 = 60 liters per person per day. This is a result for the supplied fictional inputs, not an observed statistic or guaranteed forecast.
Take it further
Fictional community uses 9000 liters daily for 120 people. Daily use per person? Expected: 9000/120 = 75 liters per person per day. Show the operation and state one model limitation.
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More practice: try new cases
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