South Australia

Australian Rain Technologies completed the thirds trial in the Mt Lofty Ranges, southeast of Adelaide, (August 2010 - December 2010), again evaluated by the University of Wollongong.

The same statistical methodology used in the 2009 trial was used with the 2010 trial data. This was done in order to ensure comparability with the model used to assess the 2009 trial and also to address the issue of ex-post model development that had been raised with respect to the analysis of the data collected for that trial. Despite substantial differences in meteorological conditions over the 2009 and 2010 trials, the statistical model was able to explain 68 per cent of the gauge-by-day variation in observed rainfall for the gauges in the downwind target area, which was similar to its performance in the 2009 trial. This corresponded to an estimated rainfall enhancement effect of 11.5 per cent, with a bootstrap confidence level of 96%. This is of the same order of magnitude as the effect estimated for the 2009 trial.