15 In his written report Mr Paterson makes the following conclusion in his summary
o Gloucester Council prepared a Flood Study, Floodplain Management Study and Floodplain Management Plan over the period 2002 to September 2003. The documents were on public exhibition over the period 19 December 2002 to 28 February 2003.
o Council's Floodplain Management Committee, in its meeting of 14 May 2002, adopted a "high hazard" category for land between the Gloucester River and "The Billabong";
o The development site is flood liable;
o The site would be flood free in a 5 % AEP flood;
o In the 1 % AEP flood, flood depths across the building site will be small; The PMF flood depth at the site is some 6 metres;
o The rate of rise of flood waters is such that conditions at the site could vary from flood free (in a 5% AEP flood) to inundated and requiring evacuation (in a 1 % AEP flood) in one to two hours;
o A flood evacuation route is available along Thunderbolts Way; Flood warning available at the site is very short;
o If residents choose to remain, as opposed to evacuation during a flood, and the flood level rises higher than predicted, a real risk to life will exist.
o The suitability of the site for residential development relies on the perfect operation of the food warning and food evacuation procedures. Given the very short warning time available, the perfect operation of flood warning and flood evacuation is optimistic.
16 During the proceedings this morning there has been discussion about the review mechanism for the Flood Plain Management Plan. The State Government Policy envisages reviews of council's flood plain management plans and Mr Paterson has advised that it would be unlikely even given the higher level of the subject site for it to be re-classified out of the high hazard area because it would still be surrounded by a high hazard area and an island within an area generally classified as high hazard would be most unusual.