Estimated maximum rainwater collection efficiency from the roof of an average home is 80% and therefore the maximum possible reduction in stormwater discharge is 80%. In Sydney and Brisbane, a 10,000 litre capacity rainwater tank will yield about 80% of indoor water use with about a 60% reduction in stormwater. In the other cities a larger rainwater tank would provide a very small additional yield. Storing rainwater for garden watering is a highly inefficient use of a rainwater tank and should never be a primary use if the objective is to maximise water yield. Australia has 5 million free standing family homes. If 5% of homes install a rainwater tank each year, security of urban water supply will be assured by 2014.
BASIS OF ABOVE CALCULATIONS 1. Water Demand Based on average household water consumption for Melbourne. Total water use for an average household is 240KL/Y comprising:
65%
or 156KL/Y is used indoors. 2. Rainfall The rainwater tank yield calculations were based on daily rainfall as recorded between 1980 - 2001 inclusive at the following sites of the Bureau of Meteorology: Sydney
Regional Office site 66062 3. Roof Run-Off Run-off (litres) = A x (Rainfall - B) x Roof Area, where A
is the efficiency of collection and a value of 0.8 is used. Roof
area of average home: 175M2 Amount
of rainfall to produce 427 litres: 3MM (175 X 3 X 0.8)
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