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Rainfall Collection Volume Calculator — result sheet
Estimate rainfall volume collected over an area from rainfall depth and a runoff or collection efficiency.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Theoretical litres = area×rainfall depth in millimetres; collected volume = theoretical×efficiency/100.
One millimetre over one square metre equals one litre, making the unit conversion visible before collection losses are applied.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Collection area — m²; minimum 0; maximum 1000000000
- Rainfall depth — mm; minimum 0; maximum 1000000
- Collection efficiency — %; minimum 0; maximum 100
Worked example
| Input | Value |
|---|---|
| Collection area | 50 |
| Rainfall depth | 20 |
| Collection efficiency | 80 |
Theoretical volume = 1,000 L; collected volume = 800 L.
Assumptions and limits
- Area is square metres, rainfall depth is millimetres, and efficiency is between 0 and 100 percent.
- Rainfall is uniform over the selected area.
- First flush, evaporation, overflow, storage, water quality, and local harvesting rules are not modeled.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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