The day was dry on January 3 until about 2pm, at which point the storm system arrived over the township and surrounds. Pre-saturation from the previous day meant that the rain from the storm had the effect of giving the ground an increased run-off coefficient; the consequence of that being that overland flow happened far quicker than it otherwise might have done. The storm water systems and natural drainage coped for the first part of the storm, but was quickly overwhelmed in the last 30 minutes as rainfall intensified during that period, delivering in excess of 30mm of rain in that period alone.