This rainfall volume reference table shows the water volume for a range of catchment area values, assuming a rainfall depth of 25 mm and a collection efficiency of 1%. Every figure is computed with the same engine that powers our Rainfall Volume Calculator, so the numbers are exact.
| Catchment area | Water volume | In cubic metres |
|---|---|---|
| 25 m² | 625.0 | 0.625 |
| 50 m² | 1,250.0 | 1.250 |
| 75 m² | 1,875.0 | 1.875 |
| 100 m² | 2,500.0 | 2.500 |
| 150 m² | 3,750.0 | 3.750 |
| 200 m² | 5,000.0 | 5.000 |
| 300 m² | 7,500.0 | 7.500 |
| 500 m² | 12,500.0 | 12.500 |
| 700 m² | 17,500.0 | 17.500 |
| 1,000 m² | 25,000.0 | 25.000 |
How to use this table
Find the row closest to your catchment area and read across to the water volume. For a value between two rows, the real figure sits between them — or enter your exact numbers in the Rainfall Volume Calculator for a precise answer.
Need a value that is not in the table? — the Rainfall Volume Calculator does it instantly, for free, with the formula and a worked example built in.
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