- Definition of a Litre (L)
- Calculate Volume of Rain Collected (L)
- Calculate Size of Catchment Area (m²)
- Calculate Rainfall in millimetres (mm)

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There is a definition of the Litre available on Wikipedia. Click here to check it out ("Litre - Wikipedia, the free encyclopedia").

In short, "A litre is defined as a special name for a cubic decimetre (1 L = 1 dm³). Hence 1 L ≡ 0.001 m³ (exactly).".

The litre can also be defined as 1L = 1000cm³ = 1000 cc (cm³ and cc both refer to "cubic centimetre")

- We know that:
- 1L = 1000mL = 1000cm³ = 1000cc;
- 1m = 100cm;
- 1cm = 10mm;
- 1mm = 0.001m;
- 1dm = 0.1m;
- 1mm = 0.01dm; and,
- 1m = 10dm

- Also:
- 1L = 1m x 1m x 0.001m = 0.001m³
- 1L = 10dm x 10dmm x 0.01dm = 1dm³
- 1L = 100cm x 100cm x 0.10cm = 1000cm³
- Therefore, 1L = 0.001m³ = 1000cm³ = 1000cc = 1dm³
- Therefore, our factor becomes 1L/m²/mm

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