Canberra rainfall pattern is very interesting...
30-year average rainfall is 629mmm/yr.
the 3 years of the worst drought in living memory, 2001-2003,
the rainfall average was still 525mm/yr. only a 20% drop.
is more rainfall during the 6 hottest months than during winter.
how to calculate how much water you can collect from your roof.
Take the number of square metres of roof, muliply by the number
of millimetres of rainfall, to give the number of litres. e.g. If
you have 150 square metres of roof, and the average Canberra rainfall
is 525 mm, then you could collect over 78,000 litres a year. A 10mm
rainfall would yield 1500 litres! In both cases, it's safest to
subtract 10% to allow for absorbtion, evaporation etc.
your information, here is the official Canberra, ACT monthly average
rainfall graph, together with the average number of rain days, supplied
by the Bureau of Meteorology.
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