Designing stormwater treatment measures generally requires a continuous simulation modelling approach using a small time step to properly consider the influence of a range of local storm characteristics and hydrologic conditions. This can be a complex and costly exercise and requires both technical expertise and the availability of a suitably long period of rainfall data. This paper describes the development of a simple but rigorous procedure to transpose known performance data from one geographic location to another within the state of Victoria in Australia. The procedure is based on continuous modelling of the performance of a number of stormwater treatment measures using 6 minute rainfall recorded over a suitably long period for 45 sites across Victoria. The size of the treatment measures required to attain prescribed water quality outcomes for each of the sites investigated is determined from application of the model. These data are then normalised and correlated to geographic and meteorological characteristics of the individual sites to enable regional relationships to be derived. Five hydrologic regions within Victoria and a further four regions for the metropolitan region in Melbourne were delineated. Their corresponding regional formulae are applicable for all sites within Victoria.

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