Darragh Drive is located in the suburb of Figtree, which includes Allans Creek. Brandy and Water Creek, a tributary of American Creek, runs along the rear of the properties on the western side of Darragh Drive. The Allans Creek Flood Study (Cardno Lawson Treloar, 2006) and the subsequent addendum (Cardno Lawson Treloar, 2008) defined the flood behaviour for the entire Allans Creek floodplain. However, during correspondence with Council and Cardno Lawson Treloar, it has been noted that the Allans Creek Flood model, which utilises the one-dimensional (1D) MIKE11 model, is not capable of explicitly defining the breakout behaviour of the flood flows in the Darragh Drive study area. Council therefore commissioned Cardno Lawson Treloar on the 23 January 2009 to construct a more detailed two-dimensional (2D) model, focusing specifically on the Darragh Drive Study area.

This report provides details on the flood modelling undertaken as a part of this detailed assessment of the Darragh Drive Study Area. Flood modelling has been undertaken for the 100 year, 50 year, 20 year, 10 year and 5 year ARI design events, together with the PMF event.