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Plumber
Rainwater Catchment
Litres captured from a roof for a rainfall.
Water captured
3375 L
For this rainfall25 mm
Formula
litres = roof area (m2) x rainfall (mm) x runoff
150 x 25 x 0.9 = 3375 L
Plan (footprint) roof area. Runoff allows for losses; about 0.9 is typical.